JP2006308414A - Maximum displacement memory device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To easily obtain maximum displacement or strain when necessary by storing maximum displacement or strain. <P>SOLUTION: The maximum displacement memory device 20 comprises an elastic deformation body 2 retained in a sensing portion so as to cause an extension strain when the displacement is caused, and a conduction path fixed to the extension strain generation part of the elastic deformation body 2 and formed with a percolation structure of conductive particles or continuous conductive fiber. The conductive path comprises sensors 10a and 10b showing variation of conductivity for the strain worked on the conduction path and a residual resistance phenomenon which is effective for retaining the conductivity varied with the maximum value of the strain. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to an apparatus for storing how much the maximum displacement has occurred, and relates to a maximum displacement storage apparatus that can easily detect a displacement caused by an unexpected situation such as an earthquake.

  After the occurrence of a dynamic contingency such as an earthquake, the functions before the occurrence need to be quickly restored at various places. In such a case, it is necessary to confirm whether or not the device or member affected by the disaster is damaged and whether or not the original function can be exhibited. However, excessive displacement and distortion due to unforeseen circumstances often return to the pre-displacement state due to the restoring force of the device or the member itself, or cannot be confirmed from the outside. If the operation is started as it is without detecting such a state, an unintended situation such as damage to these devices may occur.

Conventional displacement detectors such as displacement gauges and strain gauges detect the displacement at the time of measurement. Therefore, such a displacement detection device is intended for continuous detection of an object that constantly changes and the cause of the start of the change (for example, when a train approaching is detected and a bridge girder vibration measurement is started). Displacement is detected as time series data. Conventionally, for example, in order to detect displacement in the event of a dynamic unforeseen event such as an earthquake, a device (trigger) that constantly monitors shaking of the ground, structures, etc. due to earthquake motion is prepared. It has been necessary to start detection and recording of data such as displacement by starting the displacement detection device and the recording device according to the command (Patent Document 1). Furthermore, when a dynamic situation such as an earthquake occurs suddenly, a “delay device” that continuously measures and stores data for several seconds is necessary to prevent loss of initial data.
JP2002-5646

  However, the constant monitoring device, the recording device, and the delay device as triggers are technically sophisticated systems and are expensive. Furthermore, in order to detect such a maximum displacement with a conventional displacement meter or the like, it is necessary to search a large amount of recorded time series data and obtain a value of the maximum displacement or distortion.

  Therefore, an object of the present invention is to provide a maximum displacement storage device that stores the maximum displacement or distortion and can easily acquire the maximum displacement or distortion when necessary. Another object of the present invention is to provide a device including such a maximum displacement storage device and a displacement measurement system for the device including such a maximum displacement storage device.

  In order to solve at least one of the above problems, the present inventors have taken the following measures.

The maximum displacement storage device according to one aspect of the present invention is:
An elastically deformable body that is held in the sensing region so that tensile strain occurs when displacement occurs;
A sensor fixed to a tensile strain generation site of the elastic deformable body, comprising a conductive path by a percolation structure of conductive particles or a continuous conductive fiber, and an organic phase that holds the conductive path. The conductivity can be changed with respect to the strain applied to the sensor, and when the strain applied to the sensor is maximum, at least a part of the change amount of the conductivity changed corresponding to the strain is obtained. A strain sensor that exhibits an effective residual resistance phenomenon to hold,
It is a summary to provide.

  According to this maximum displacement storage device, the conductivity of the sensor can be changed by the strain received by the sensor, and when the strain applied to the sensor is the largest of the strains received so far, A conductive path exhibiting a residual resistance phenomenon is provided so as to retain at least a part of the amount of change in conductivity corresponding to the strain. For this reason, the conductivity of the conductive path after removing the strain can be associated with the maximum value of the strain that the sensor has received so far. That is, the sensor can store the maximum strain as the conductivity of the conductive path. Therefore, by acquiring the relationship between strain and displacement loaded on the strain sensor in advance and the relationship between strain and conductivity, the maximum displacement and maximum strain acting on the strain sensor can be known. Therefore, by conducting the current through the conductive path when necessary, it is possible to obtain data on the conductivity corresponding to the maximum value of the applied strain. As a result, it is possible to detect the maximum strain up to that point and the maximum displacement due to the strain when necessary. Further, the maximum displacement and distortion can be easily detected without requiring a constant monitoring device, a displacement meter, a time-series data recording device, a delay device, and a maximum value search system as a trigger.

  In this maximum displacement memory device, the elastic deformation body can be supported in a cantilever type. According to such a form, displacement and distortion can be detected with high sensitivity. The elastic deformation body may be supported by a both-end fixed beam type. By doing so, displacement and distortion can be detected with high sensitivity. Furthermore, it is preferable that the elastic deformable body is supported with an arch-shaped portion at least partially. By doing so, it is possible to detect displacements in different directions between the outside and the inside of the arch-shaped portion. Moreover, the displacement of the relative distance between two points can be detected with high sensitivity. In these maximum displacement storage devices, the material and form of the elastic deformation body are not particularly limited, but may be a leaf spring. If it is a leaf spring, the maximum displacement or distortion can be detected easily and accurately.

  Such a maximum displacement storage device is preferably used to detect the maximum relative displacement between two sites. This is because such maximum relative displacement is a displacement that is highly necessary to be detected in the apparatus or between members. Such a maximum displacement storage device is preferably used for detecting a maximum relative displacement in two or more directions between two parts. This is because such a maximum relative displacement is likely to occur in the equipment or between members in an unexpected situation.

  Such a maximum displacement storage device can be used for determining the soundness of an infrastructure structure in a disaster such as an earthquake. This is because the soundness of the infrastructure needs to be quickly and accurately determined in order to restore the infrastructure in the event of a disaster, and this maximum displacement storage device is preferable for such soundness determination. Here, infrastructure refers to industrial infrastructure such as roads, railways, harbors, dams, bridges, energy plants, as well as schools, hospitals, parks, social welfare facilities, and disaster prevention facilities (disaster prevention center, emergency designation) It is a concept that includes social capital related to daily life such as hospitals and shelters. Further, the infrastructure structure is a structure constituting the infrastructure or a part thereof. This is because the infrastructure is required to be resumed by prompt judgment even after being displaced by an earthquake or the like. The determination of soundness means that the determination target determines that there is no abnormality or defect that interferes with the original function.

  When the maximum displacement storage device of the present invention is used for soundness determination, the maximum displacement that can maintain soundness is determined in advance for each installation target part (or a plurality of storage devices) of the storage device. It is possible to detect the maximum displacement or distortion generated in the installation target site. For this reason, even if it is an unexpected situation etc., the soundness of an apparatus installation object site | part can be determined promptly and reliably when needed. Further, the maximum displacement and distortion can be easily detected without requiring a constant monitoring device, a displacement meter, a time-series data recording device, a delay device, and a maximum value search system as a trigger.

Furthermore, the maximum displacement measuring device according to another aspect of the present invention is:
An elastically deformable body that is held in the sensing region so that tensile strain occurs when displacement occurs;
A sensor fixed to a tensile strain generation site of the elastic deformation body, comprising a conductor phase of a conductive particle percolation structure or continuous conductive fibers, an organic phase holding the conductor phase, and the conductor phase A conductive path, the conductivity of the conductive path can be changed with respect to the strain applied to the sensor, and the conductivity changed corresponding to the strain when the strain applied to the sensor is maximum. A maximum displacement storage device comprising a strain sensor that exhibits a residual resistance phenomenon effective to hold at least a part of the change amount of
The conductive displacement of the sensor of the maximum displacement storage device is energized to acquire conductivity data when the conductive pathway is conducted, and based on the acquired conductivity data, the maximum displacement at the sensing site in the device or Maximum displacement measuring means for detecting strain;
It is a summary to provide.

  According to this maximum displacement measuring device, it is possible to obtain data on conductivity corresponding to the maximum value of the applied strain by energizing the conductive path when necessary. Therefore, since it is possible to detect the maximum displacement or distortion that has occurred in the sensing part of the device installation object until then, the soundness of the device installation target part can be detected promptly and reliably when necessary even in the event of an unexpected situation. Can determine gender. Further, the maximum displacement and distortion can be easily detected without requiring a constant monitoring device, a displacement meter, a time-series data recording device, a delay device, and a maximum value search system as a trigger.

Still another aspect of the present invention is a maximum displacement measuring system,
One or more devices;
An elastic deformable body that is attached to a sensing portion of the device and is held so as to generate tensile strain when displacement occurs, and a sensor that is fixed to the tensile strain occurrence portion of the elastic deformable body, the conductive particles A conductive phase composed of continuous conductive fibers, an organic phase that holds the conductive phase, and a conductive path that includes the conductive phase, and the conductive path is conductive to strain acting on the sensor. When the strain acting on the sensor is maximum, the residual resistance phenomenon effective to retain at least a part of the change amount of the conductivity changed corresponding to the strain is exhibited. A maximum displacement storage device comprising a strain sensor;
Conducting current through the conductive path of the sensor of the maximum displacement storage device to acquire conductivity data when the conductive path is conducted, and obtaining a maximum displacement or distortion at the displacement sensing portion based on the acquired conductivity data. Maximum displacement measuring means to detect;
It is a summary to provide.

  According to the maximum displacement measuring system of the present invention, it is possible to obtain data on conductivity corresponding to the maximum value of the applied strain by conducting the conductive path when necessary. Therefore, since it is possible to detect the maximum displacement or distortion that has occurred in the device installation target site until then, the soundness of the device installation target site can be determined promptly and reliably when necessary, even in the event of an unexpected situation. . Further, the maximum displacement and distortion can be easily detected without requiring a constant monitoring device, a displacement meter, a time-series data recording device, a delay device, and a maximum value search system as a trigger.

  Next, embodiments of the present invention will be described with reference to examples.

  1 is a diagram showing a maximum displacement storage device 20 in the maximum displacement measurement system 1, FIG. 2 is a diagram showing an example of the maximum displacement measurement system 1, and FIG. 3 is a strain sensor in the maximum displacement storage device 20. FIG. 4 is a diagram illustrating a state in which the maximum displacement storage device 20 is attached to the displacement sensing portion of the device 100. FIG. The maximum displacement measurement system 1 according to the present embodiment includes a device 100, a maximum displacement storage device 20 provided in the device 100, and a maximum displacement measurement device 200.

  The maximum displacement storage device 20 includes a leaf spring 2 that is held so that a tensile strain is generated when a displacement occurs in the sensing portion of the device 100, and a strain sensor 10 that can store the maximum strain. The leaf spring 2 is a long body, and one end of the leaf spring 2 is a fixing portion 4 for holding the leaf spring 2 in a cantilever shape, so that the leaf spring 2 can be attached to a predetermined displacement sensing part of the device 100. It is formed so that it can be attached. Further, convex contact portions 6a and 6b are provided on both surfaces of the other end which is the free end of the leaf spring 2, respectively. The contact portions 6a and 6b are configured such that when the sensing portion of the device 100 is displaced, the sensing portion is brought into contact with the contact portion 6a and 6b so that the leaf spring 2 can be deformed.

  Sheet-shaped strain sensors 10a and 10b are provided on both surfaces, which are tensile strain generation sites, in the central portion of the leaf spring 2, respectively. The strain sensors 10a and 10b can detect a strain (displacement) based on a tensile force and store the strain by a residual phenomenon of an electrical resistance change. In the leaf spring 2, a tensile force acts on the surface opposite to the bent direction, and a tensile strain is generated. Therefore, by providing the strain sensors 10a and 10b on both surfaces of the leaf spring 2, the maximum value of the displacement (strain) in the two bending directions generated in the leaf spring 2 can be stored.

  The strain sensors 10a and 10b are fixed to the leaf spring 2 with an adhesive. In order to reliably transmit the deformation generated in the leaf spring 2 to the strain sensors 10a and 10b, physical fixing means such as an adhesive and / or bolts / nuts or welding can be preferably used.

Each of the strain sensors 10a and 10b includes a conductive path formed by a percolation structure of conductive particles or a continuous conductive fiber, and the conductive path exhibits a change in conductivity with respect to a strain applied to the conductive path, and the strain. It is possible to exhibit a residual resistance phenomenon effective for maintaining the conductivity changed corresponding to the maximum value of. As a result, the maximum strain received once can be stored even if the external force is released after receiving the tensile strain. The residual ratio of the residual resistance phenomenon (ratio of the amount of change in conductivity to be retained) that is effective in maintaining the change in conductivity corresponding to the maximum value of the strain applied to the conductive paths of the strain sensors 10a and 10b is 60%. Preferably, it is 80% or more, more preferably 90% or more, and most preferably 95% or more.

  Here, the maximum displacement or strain detection mechanism in the strain sensors 10a and 10b will be described. FIG. 3 is a graph showing the relationship between the tensile strain measured when the tensile force and the compressive force are alternately applied to the strain sensors 10a and 10b. In the following description, an electrical resistance value is used as an index of conductivity. As shown in FIG. 3, a tensile force and a compressive force are alternately applied to the strain sensors 10a and 10b. When a tensile force is added as the first external force, a tensile strain is generated in the strain sensor, and the electric resistance value changes up to point a in the graph. Next, even if compressive force is applied in the opposite direction for the second time, the electrical resistance value does not decrease, and the electrical resistance value at point a is maintained. After that, when the tensile force is applied again for the third time, the electric resistance value does not change in the range below the first maximum tensile strain, but the electric resistance value starts to increase when the first maximum tensile strain is exceeded, When addition is stopped, point b is reached. As described above, in the strain sensors 10a and 10b, the electrical resistance value is not updated unless a tensile strain larger than the tensile strain once added is applied, and conversely, in the past until a larger tensile strain acts. The received maximum strain can be held (stored) as an electric resistance value. Note that conductivity can also be used as an index of conductivity.

  By previously obtaining the relationship between the change amount of the electrical resistance value detected by the strain sensors 10a and 10b and the displacement and strain, it is possible to know the displacement and strain generated in the sensing region from the detected electrical resistance value.

  As such sensors 10a and 10b, for example, a strain sensor described in JP-A-2004-264159 can be used. This strain sensor has a conductive path that exhibits irreversible breaking behavior with respect to the maximum strain, and the residual rate of the residual resistance phenomenon has been improved and the developed strain has been reduced. The maximum strain is monitored and stored. One form of such a conductive path is a conductive path formed by a continuous contact structure of conductive particles in a matrix reinforced with insulating fibers. By adjusting the particle shape and / or the volume ratio of the particles to the organic phase in this conductive path, the residual ratio of the residual resistance phenomenon is improved and the strain range that is manifested is reduced, and the maximum strain accuracy stored. Is improved. Another form is a conductive path formed of conductive fibers in a resin matrix reinforced with glass fibers. In this conductive path, by applying tension to the conductive fiber, the residual ratio of the residual resistance phenomenon is improved, the developed strain is reduced, and the stored maximum strain accuracy is improved.

  When the conductive path is formed by the continuous contact structure of the conductive particles, the conductive path is maintained as it is, preferably in an organic phase, and has a sensing material form of a polymer material molded body. As the conductive particles, any conductive material can be used without particular limitation. For example, carbon black, ketjen black, acetylene black, graphite, activated carbon, carbon short fiber, fullerene, carbon whisker, carbon nanotube, metal powder, conductive ceramic particles such as nitriding, carbonizing, and titanium oxide are selected. The conductive particles can be used alone or in combination of two or more.

The form of the conductive particles is not particularly limited. For example, various shapes such as a structure (aggregate) shape, a spherical shape, a fiber shape, a rod shape, an indefinite shape, and a flake shape can be used alone or in combination. Preferably, a structure (aggregate) form can be used, and the particle size of each particle forming the structure is not particularly limited, but is preferably 10 nm to 100 nm, for example. More preferably, a structure (aggregate) -like form composed of particles of 20 nm or more and 60 nm or less is used. Additionally, DBP (DibutylPhthalate) absorption which is an index indicating the degree of the structure (aggregation) (JIS K6217) is preferably 10~1000cm ³ / 100g. More preferably, it is 100-500 cm < ³ > / 100g. Further, as the spherical or flaky particles, preferably spherical or flaky particles of 1 μm to 100 μm can be used. Such aggregates are generally often formed in carbon black particles. Specifically, it takes a grape-like aggregate form.

  In addition, when the conductive path is a conductive fiber, it is preferable that the conductive path is in the form of a composite material that is held in an organic phase and is a polymer material molded body. Here, the conductive fiber is not particularly limited as long as it is a conductive fiber. For example, pitch-based, PAN-based, vapor-grown carbon fiber, ceramic fiber such as SiC, and a conductive film formed on the surface thereof. Selected fibers, metal fibers and the like are selected. As the conductive fibers, various conductive fibers can be used alone or in combination of two or more. The conductive fiber may be a monofilament or a multifilament. Although the diameter is not particularly limited, it is preferably 1 μm to 100 μm, for example. More preferably, they are 2 micrometers or more and 10 micrometers or less.

  The organic phase that is the matrix of the strain sensors 10a and 10b is, for example, polyester, polypropylene, acrylic, nylon, polyethylene, polystyrene, polyvinyl chloride, polyvinylidene chloride, polyvinyl alcohol, polysulfone, polyacetal, polyurethane, polyfomal, polybutyral, Polyamide, polycarbonate, polyvinyl acetate, copolymers of two or more of the above polymers, fluorine resins, silicone resins, epoxy resins, and vinyl ester resins can be used. These can be used alone or in combination of two or more.

  Furthermore, it can also be used in the state which heat-processed these organic phases. Specifically, these organic phases are heated in an inert atmosphere to carbonize, graft, cyclize, aromatize, condense, polymerize, and the like. In this heat treatment, the conductivity of the organic phase can be adjusted. By promoting the progress of carbonization or graphitization in the organic phase, the organic phase can be made conductive, and by suppressing the progress of graphitization, the formation of conductor can be suppressed and insulation can be maintained. Further, the organic phase is subjected to heat treatment in an inert atmosphere, thereby generating residual stress. With this residual stress, the residual resistance phenomenon can be expressed with a high residual rate, and the maximum value can be stored even with low strain.

  In order for the conductive path by the conductive particles to function effectively, it is preferable that the organic phase has high resistance, that is, is insulating. The heat treatment conditions for this vary depending on the organic polymer material used, but the heat treatment temperature is preferably 2000 ° C. or lower, more preferably 1000 ° C. or lower, and even more preferably 600 ° C. or lower. On the other hand, in order to convert the organic phase into a conductor, the heat treatment temperature is preferably 600 ° C. or higher, more preferably 1000 ° C. or higher, and still more preferably 2000 ° C. or higher, although it depends on the polymer material used. is there.

  The organic phase can also include a fiber material. As the fiber material, for example, one kind or two or more kinds of glass fiber, vinylon fiber, aramid fiber, silicon carbide fiber, alumina fiber and the like can be used. Here, in order to develop a sensing function using the contact structure of conductive particles or conductive fibers as a conductive path, these fibers need to have electrical insulation. Furthermore, the directionality of these fibers can be parallel or perpendicular to the direction of conductivity measurement by the present strain sensor or the direction of strain acting on the applied structure as one direction. In the case of unidirectionality, a fiber bundle in which fibers oriented in the same direction are bundled can also be used. It is also possible to use a cloth material in which fibers that are parallel and perpendicular to the strain direction to be measured are combined. Specifically, it is preferably provided along the conductive path.

  A method for measuring the conductivity or resistivity of these strain sensors 10a and 10b is not particularly limited, but it is preferable to adopt a two-terminal method or a four-terminal method. The resistivity of such a conductive path varies depending on the material, but the conductive path with conductive particles has a relatively high resistivity and can be measured by the two-terminal method. On the other hand, a conductive path using conductive fibers has a relatively low resistivity, and measurement by a four-terminal method may be required. In addition, as a measurement direction of the conductivity, it is preferable to pay attention to the directionality of the strain acting on the sensing part of the device 100 and to match the direction in which the strain acts.

  Electrodes (not shown) are provided at both ends of the conductive paths in the strain sensors 10a and 10b, and lead wires 12 are connected to these electrodes.

  As shown in FIG. 2, the measuring device 200 is a device that measures and manages the maximum displacement or strain generated in the measurement target region 100. The most basic measuring device 200 is a digital electric resistance value measuring device. When the number of measurement points is small, the lead wire 12 of the maximum displacement storage device 20 is directly connected to the measuring device 200 via the lead wire terminal 14 for measurement. It can be performed.

  The measuring apparatus 200 may be configured by adding a microprocessor centered on a CPU, RAM, ROM, etc. to a digital electric resistance measuring device. In the measuring apparatus 200 configured as described above, initial values and converted values (coefficients for converting the amount of change in the electrical resistance value into displacement or strain) of the plurality of maximum displacement storage devices 20 and each maximum strain storage device 20 are provided. A scan function for storing and storing data such as boundary values (displacement or strain values for determining whether or not the measurement site is healthy) and measuring a plurality of maximum displacement storage devices 20 can be provided. . Thus, the electrical resistance value in the strain sensors 10a and 10b is acquired via the lead wire 12, the terminal 14 and the terminal box 16, and based on this, the maximum displacement or strain generated in the strain sensors 10a and 10b is calculated. Further, it can be determined whether the measurement site is healthy. Since the measuring device 200 is used in an unexpected situation such as an earthquake, it is preferable that the measuring device 200 is operated by a battery or a rechargeable battery.

  Such a maximum displacement storage device 20 is attached to the sensing part of the device 100 in the state shown in FIG. The maximum displacement storage device 20 of this embodiment detects a relative displacement between the member A and the member B of the device 100. FIG. 4 shows an example of an installation form particularly when displacement is assumed in the member B. In this example, the brackets 110 and 112 are protruded from the member B, and the leaf spring 2 is fixed to the member A so that the contact portions 6a and 6b are interposed between the brackets 110 and 112. In this example, it is assumed that the member A is a fixed point that is not displaced or a relatively rigid part / member, and that the relative displacement with the member B occurs in the vertical direction within the plane of FIG.

  Next, in the maximum displacement measurement system 1, an operation when measuring the maximum displacement in the device 100 when it is estimated that a large displacement or distortion has occurred in the device 100 due to an earthquake or the like will be described. FIG. 5 shows an example of a flow when measuring the maximum displacement in the maximum displacement measuring system 1. It is assumed that the initial value of the electrical resistance of the strain sensors 10a and 10b and the converted value from the change value of the electrical resistance to the displacement or strain are stored in advance in the storage device of the measuring device.

  As shown in FIG. 5, the circuit is switched for a plurality of measurement points, the electrical resistance value is sequentially measured, the change value is obtained from the difference from the initial value, the maximum strain or displacement is obtained by the converted value, and in some cases the boundary The determination of soundness by comparison with the value is repeated for the number of measurement points. As shown in FIG. 5, when the number of measurement points is 1, it is also possible to read the electrical resistance value by directly connecting a digital electrical resistance value measuring device to the lead wire terminal. In this case, the calculation of the difference from the initial value, the conversion to the strain or displacement by the converted value, and the comparison with the boundary value are performed manually.

  According to the maximum displacement measuring system 1 of the embodiment described above, a resistance phenomenon that is effective to maintain conductivity corresponding to the maximum value of strain remains in the strain sensors 10a and 10b. For this reason, by conducting the conductive path when necessary, it is possible to obtain data on the conductivity corresponding to the maximum value of the applied strain. Therefore, the maximum displacement or distortion up to that time can be detected when necessary. Further, the maximum displacement and distortion can be easily detected without requiring a constant monitoring device, a displacement meter, a time-series data recording device, a delay device, and a maximum value search system as a trigger. Therefore, when a large displacement is assumed in the device 100 due to an earthquake or the like, the maximum displacement (strain) amount generated in the device 100 can be measured immediately. Therefore, it is possible to quickly and accurately evaluate the soundness of the device 100 and make a determination such as operating or repairing the device 100.

  Further, according to the system 1 of the present embodiment, since the elastic deformation body is used as the support body of the strain sensors 10a and 10b of the maximum displacement storage device 20, the external force generated in the device 100 can be detected with high sensitivity, and the device The deformation part in 100 is not prevented from being restored. For this reason, the influence on operation | movement of the apparatus 100 by mounting | wearing with the maximum displacement memory | storage device 20 is avoided or suppressed.

  Further, according to the system 1 of the present embodiment, the maximum displacement storage device 20 is a cantilever type and supported by the strain sensing portion of the device 100, so that the displacement and strain in the device 100 can be detected with high sensitivity. . In the strain sensors 10a and 10b, since the leaf spring 2 is used as an elastic deformable body, the maximum displacement or strain can be detected easily and accurately. Moreover, the displacement of two directions can be easily detected now using both surfaces.

  Further, according to the system 1 of the present embodiment, since the battery or the rechargeable battery is used as the power supply device, the maximum displacement (distortion) amount can be reliably measured even in an emergency such as an earthquake.

  Here, in this embodiment, the leaf spring 2 corresponds to an elastic deformation body of the maximum displacement storage device of the present invention, and the strain sensors 10a and 10b correspond to sensors. The measuring device 200 corresponds to the maximum displacement measuring means of the present invention.

  In the system 1 of the present embodiment, the leaf spring 2 is used as the elastic deformable body. However, the present invention is not limited to this, and various conventionally known elastic deformable bodies can be used. For example, as an elastic deformable body, in addition to various springs that exhibit elastic deformation structurally, such as a normal spiral spring or a rod-shaped spring, rubber having a three-dimensional shape using a material that elastically deforms materially, Plastic can also be used. Preferably, it is preferable to use a structure and a material that are structurally and / or chemically stable and that can stably maintain their elastic deformation performance.

  Further, in the system 1 of the present embodiment, the elastic deformable body is mounted in the initial state without bending or deformation, but may be mounted on the sensing site in a form having a bent portion or a curved portion in advance. . The form that the elastic deformable body can take can be appropriately changed depending on the mounting form of the maximum displacement storage device 20, the direction of strain to be detected, and the like.

  In the system 1 of the present embodiment, the sheet-like strain sensors 10a and 10b are used. However, the form of the strain sensors 10a and 10b is not limited to this, and may be a rod shape. The form of the strain sensors 10a and 10b varies depending on the form of the conductive path and the elastic deformation body to be used.

  In the system 1 of this embodiment, the two-directional displacement detection type is provided by providing the strain sensors 10a and 10b on both sides of the leaf spring 2, but as shown in FIG. Can be used as a one-direction displacement detection type.

  In addition, according to the system 1 of the present embodiment, the sensing part that is assumed to move relative to the predetermined surface of the A member of the device 100 (the mounting surface of the maximum displacement storage device 20) vertically is maximum. Although the displacement memory | storage device 20 was fixed, it is not limited to this, What is necessary is just a form with which a tensile force acts on an elastic deformation body, such as the leaf | plate spring 2, by the assumed displacement. For this reason, various mounting forms are possible depending on the form of the sensing portion, the assumed direction of displacement, and the like. For example, as shown in FIG. 7, when the members A and B that intersect each other are displaced parallel to a predetermined surface of the member A (the mounting surface of the maximum displacement storage device 20) or along a certain trajectory. The vertical displacement storage device 20 is fixed perpendicularly to the member A, and the contact portions 6a and 6b are sandwiched between brackets 120 and 122 protruding sideways from a support extending downward from the member B.

  Another example is shown in FIG. FIG. 8 is an example of a mounting form in the case where the member B and the member B intersect each other and the member B moves vertically with respect to the member A. In this embodiment, the contact portions 6a and 6b are sandwiched between brackets 120 and 122 that protrude upward from a support body extending laterally from the member A. In this way, the maximum displacement storage device 20 can be fixed to the member B that is displaced, but the maximum displacement storage device 20 can also be fixed to the member A that is not displaced or difficult to displace. Any configuration may be used as long as a tensile force acts on the strain sensors 10a and 10b with high sensitivity by displacement.

  Next, another embodiment of the maximum displacement measuring system 1 of the present invention will be described. The present embodiment has the same configuration as that of the first embodiment, except that a both-end fixed beam type maximum displacement storage device 420 is used. FIG. 9 shows an outline of the structure of the maximum displacement storage device 420 of the present embodiment, and FIG. Hereinafter, in the description of the second embodiment, the description of the same configuration as that of the first embodiment is omitted, and the member names described in the first embodiment and the symbols corresponding thereto can be used as they are. It explains using.

  As shown in FIG. 9, the maximum displacement storage device 420 includes a leaf spring 402 having an arch-shaped portion and strain sensors 410a and 410b. The leaf spring 402 is a long plate-like body and is deformed into an arch shape, and has fixing portions 404a and 404b to which the leaf spring 402 can be attached to the sensing part of the device 100 at both ends thereof. The fixed portions 404a and 404b are simultaneously displacement transmission portions in the sensing part of the device 100, and can detect displacement generated between the fixed portions 404a and 404b at both ends.

  In the maximum displacement storage device 420, strain sensors 410 a and 410 b are fixed to the arched portion of the leaf spring 402. The outer surface of the arched part is the part where the tensile force acts when deformation occurs that narrows the arch interval, and the inner surface of the arched part is when deformation that increases the arch interval occurs It is a site where a tensile force acts on. Therefore, according to the strain sensors 410a and 410b of the present embodiment, it is effective to detect the displacement (minimum value, maximum value) of the section length between the two parts. Similar to the first embodiment, the strain sensors 410a and 410b include a conductive path using conductive particles.

  Such a maximum displacement storage device 420 is attached to the sensing part of the device 100 in the state shown in FIG. The form shown in FIG. 10 is a mounting form particularly suitable for measuring the relative distance between the member A and the member B. That is, the minimum value of the relative distance can be measured by the strain sensor 410a fixed to the outer surface of the arch-shaped portion, and the maximum value of the relative distance can be measured by the strain sensor 410b fixed to the inner surface of the arch-shaped portion.

  According to the system 1 of the second embodiment, the strain sensors 410a and 410b are energized in a timely manner as in the first embodiment (step S100), the electric resistance value is acquired (step S200), and the maximum displacement (strain) is obtained. Can be measured.

  According to the maximum displacement measurement system 1 of the second embodiment described above, the same operational effects as the first embodiment can be obtained, and the maximum displacement storage device 420 includes the arched leaf spring 402. A displacement (strain) similar to a change in relative distance can be stored and measured. Therefore, the system 1 effective to be applied to the device 100 that is likely to cause such a displacement and the sensing part that may cause such a displacement is provided. In particular, by using a leaf spring 402 having an arch-shaped portion, it is possible to detect displacements with different directivities on the outer surface and inner surface (distance reduction on the outer surface, enlargement on the inner surface). Since a lot of information can be obtained, it is possible to more accurately determine the soundness of the device 100 and the like.

  In addition, according to the system 1 of the present embodiment, since the arched leaf spring 402 is used, the degree of freedom of the mounting form on the sensing part to the device 100 is improved, and the bracket is attached at the time of mounting. The usage can be reduced and the mounting configuration can be simplified.

  The modification already described in the first embodiment can be applied to the second embodiment, and the following modifications are possible. In this embodiment, the U-shaped arched leaf spring 402 is used. However, the arch shape is not limited to the U-shape, and may be an arc shape, and a plurality of arch-shaped portions may be provided. You may have. Moreover, if it has an arch-shaped part, a ring or a ring-shaped spring can be used, or a cylindrical body having a semicircular cross section or a cross section close to a full circle can be used. Similarly to the first embodiment, the arched leaf spring 402 according to the present embodiment can be made of an elastic deformable body having an arch-like portion, other than the leaf spring. Furthermore, as the elastic deformable body having an arch-shaped portion, an elastic deformable body having a form having only a portion corresponding to the outer surface or the inner surface as the arch-shaped portion can be used.

  Further, in this embodiment, the mounting form is suitable for measuring the displacement of the relative distance by sliding movement, but the mounting form of the maximum displacement storage device 420 is not limited to this and is arbitrary. For example, as shown in FIG. 11, it is possible to adopt a configuration in which the two members are assumed to be relatively rotationally displaced. In this mode, the fixing part is prepared in advance so as to be compatible with the members A and B, and in this mode, calibration of the change in conductivity and the change in angle or strain is obtained in advance. Can do.

  Further, in the present embodiment, the arched plate spring 402 is fixed to the sensing part of the device 100 by using both ends of the arched plate spring 402 as fixing portions 404a and 404b. However, the present invention is not limited to this. Even when the arch-shaped leaf spring 402 is used, cantilever-type fixing is possible, and depending on the sensing part, the arch-shaped leaf spring 402 may be held between two members without being fixed. It can also be made.

  In the first and second embodiments described above, the present invention has been described as the maximum displacement measurement system. In addition, the maximum displacement memory provided in a plurality of devices connected via a network such as a LAN, the Internet, or a dedicated line. It is also possible to take the form of a maximum displacement measurement system composed of a device and a management device.

  The embodiments of the present invention have been described using the embodiments. However, the present invention is not limited to these embodiments, and can be implemented in various forms without departing from the gist of the present invention. Of course you get.

The figure which shows the maximum displacement memory | storage device in a maximum displacement measurement system. The figure which shows an example of the maximum displacement measurement system of this invention. The figure explaining the maximum displacement (strain) storage function of the strain sensor in the maximum displacement storage device. The figure which shows the state which mounted | wore the sensing part of an apparatus with the largest displacement memory | storage device. The figure which shows an example of the flow when measuring the maximum displacement in a maximum displacement measurement system. The figure which shows the modification as a 1 direction displacement detection type | mold. The figure which shows another example of the mounting form of the largest displacement memory | storage device. The figure which shows another example of the mounting form of the largest displacement memory | storage device. FIG. 6 is a diagram illustrating a maximum displacement storage device according to a second embodiment. The figure which shows the mounting state to the sensing site | part of the apparatus of a maximum displacement memory | storage device. The figure which shows the mounting | wearing form between two members in which relative rotational displacement is assumed.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Maximum displacement measuring system, 2,402, Leaf spring, 4,404a, 404b Fixed part, 6a, 6b Contact part, 10a, 10b, 410a, 410b Strain sensor, 20, 420 Maximum displacement memory | storage device, 12 Lead wire, 14 Terminal, 16 terminal box, 100 device, 110, 112 bracket, 200 management device, 300 power supply device, 310, 320 electrical resistance detection circuit.

Claims (11)

A maximum displacement storage device,
An elastically deformable body that is held in the sensing region so that tensile strain occurs when displacement occurs;
A sensor fixed to a tensile strain generation site of the elastic deformable body, comprising a conductive path by a percolation structure of conductive particles or a continuous conductive fiber, and an organic phase that holds the conductive path, and the conductive path The conductivity can be changed with respect to the strain applied to the sensor, and when the strain applied to the sensor is maximum, at least a part of the change amount of the conductivity changed corresponding to the strain is obtained. A strain sensor that exhibits an effective residual resistance phenomenon to hold,
A device comprising:   The apparatus according to claim 1, wherein the elastic deformation body is supported in a cantilever shape.   The apparatus according to claim 1, wherein the elastic deformation body is supported by a both-end fixed beam type.   The apparatus according to claim 1, wherein the elastic deformation body is supported in an arch shape.   The apparatus according to claim 1, wherein the elastic deformation body is a leaf spring.   The apparatus in any one of Claims 1-5 for detecting the largest relative displacement between 2 site | parts.   The apparatus in any one of Claims 1-5 for detecting the maximum displacement of one direction or two directions or more between two site | parts. The strain sensor includes an insulating fiber along the conductive path,
An organic phase obtained by heat treating an organic polymer material along the insulating fiber;
The apparatus according to claim 1, comprising:   The maximum displacement memory | storage device in any one of Claims 1-8 which is for the soundness determination at the time of a disaster. A maximum displacement measuring device,
An elastically deformable body that is held in the sensing region so that tensile strain occurs when displacement occurs;
A strain sensor fixed to a tensile strain generation site of the elastic deformable body, comprising a conductive path by a percolation structure of conductive particles or a continuous conductive fiber, and an organic phase that holds the conductive path. The path can change its conductivity with respect to the strain applied to the sensor, and when the strain applied to the sensor is maximum, at least a part of the change amount of the conductivity changed corresponding to the strain. A strain sensor that exhibits a residual resistance phenomenon effective to hold
A maximum displacement storage device comprising:
The conductive displacement of the sensor of the maximum displacement storage device is energized to acquire conductivity data when the conductive pathway is conducted, and based on the acquired conductivity data, the maximum displacement at the sensing portion of the device or Maximum displacement measuring means for detecting strain;
A device comprising: A maximum displacement measurement system,
One or more devices;
An elastic deformation body that is attached to a sensing portion of the device and is held so as to generate a tensile strain when displacement occurs, and a strain sensor that is fixed to the tensile strain generation portion of the elastic deformation body, A conductive path formed by a percolation structure of particles or a continuous conductive fiber, and an organic phase that holds the conductive path. The conductive path can change its conductivity with respect to strain applied to the sensor, and A maximum memory comprising a strain sensor, which exhibits a residual resistance phenomenon effective to hold at least a part of the change in conductivity corresponding to the strain when the strain acting on the sensor is maximum; A strainer;
Conducting current through the conductive path of the sensor of the maximum displacement storage device to acquire conductivity data when the conductive path is conducted, and obtaining a maximum displacement or distortion at the displacement sensing portion based on the acquired conductivity data. Maximum displacement measuring means to detect;
A system comprising:

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