JP4350388B2 - Method for predicting breakage of flexible hose - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention provides a method for predicting breakage of a flexible hose and detecting a break in the reinforcing wire of a flexible hose in which a reinforcing metal wire spirally wound over a predetermined length is embedded in a peripheral wall. The present invention relates to a reinforcing wire breakage detecting device for carrying out the above-described method for issuing an alarm.
[0002]
[Prior art]
Conventionally, a flexible hose made of plastics or rubber or the like for transferring slurry or granular material is easily worn because its inner surface is constantly subjected to friction with a transfer object, particularly at a bent portion where a large frictional force acts. It was observed that it was further damaged. In consideration of such circumstances, a flexible hose suitable for such a use is generally made of a plastic material in which a metal wire spirally wound for reinforcement is embedded in the peripheral wall.
[0003]
Such a flexible hose is inevitably worn out due to sliding friction with the transported material while being used for a long time, and a part of the flexible hose is damaged. In addition, if it is damaged, the entire apparatus must be temporarily stopped to perform the replacement work, which significantly reduces the work efficiency. In order to avoid such a situation, for example, an inner rubber layer, a main reinforcing layer, a conductor, an outflow fluid absorbing layer, an auxiliary reinforcing layer, and an outer rubber layer are sequentially laminated from the inside to form a conductive structure. There has been proposed a fluid transfer flexible hose provided with alarm means for issuing an alarm by an attached electronic circuit when the body cuts or changes its resistance value due to the pressure of the fluid leaking into the spilled fluid absorption layer (For example, refer to Patent Document 1).
[0004]
In such a hose, an alarm means such as a light or the like which is formed by a metal wire or a conductive rubber member which can cut the conductor or whose resistance value changes, and which is substantially connected in parallel between both ends of the conductor by the cutting or change. By lighting up, the operator is made aware of the breakage of the main reinforcing layer group.
[0005]
In addition, as a device for predicting the breakage of the flexible hose, a pressure transducer is attached to the outer peripheral surface of the flexible hose, and the number of sudden surges generated suddenly applied to the flexible hose is counted. There is also known a burst prediction device for a high-pressure rubber hose that issues an alarm from the equipment diagnostic device when the critical number of surge pressures for each hose recorded in advance in the equipment diagnostic device is exceeded (see, for example, Patent Document 2). ).
[0006]
[Patent Document 1]
Japanese Patent Publication No. 2002-181259 (page 5-6, FIGS. 7 to 12)
[Patent Document 2]
Japanese Patent Publication No. 11-30364 (first page, FIG. 1)
[0007]
[Problems to be solved by the invention]
However, with respect to the fluid transfer hose exemplified first, it is effective only for a flexible hose having a specific structure such that the hose body has a very complicated multilayer structure and a conductor is separately incorporated between the layers. It is a damage prediction and alarm device, and the alarm is only issued for a change in the conductor just before the damage, and if it is overlooked or missed, the damage cannot be predicted. There's a problem.
[0008]
In addition, regarding the burst prediction device for the high pressure rubber hose exemplified below, although a relatively complicated electronic device is used, an alarm is issued based on the number of surge pressures. It is recognized that it has the disadvantage of not being able to deal with sex accurately. However, it is an object of the present invention to be able to always distinguish between a normal state and an abnormal state for a variety of inexpensive flexible hoses with a simple structure that are commercially available. An object of the present invention is to provide a reinforcing wire breakage detecting device for detecting a state and reliably issuing an alarm so that an operator can easily and reliably predict the breakage of the flexible hose and foreseeing the breakage of the flexible hose. .
[0009]
[Means for Solving the Problems]
The above-described object is to provide a flexible hose breakage prediction method according to the present invention as described in claim 1, in which a detection circuit having an energization display means operated by a relay switch is connected in series with a power source between both ends of a metal wire. An alarm circuit with a warning display means connected and also operated by a relay switch is connected in series with the power supply separately from the detection circuit, and when the reinforcing wire breaks, the relay switch is turned off and the detection circuit is shut off The energization display means is turned off, and at the same time, the relay switch is also turned off to activate the alarm circuit to turn on the alarm display means, and the relay switch switches between the detection circuit and the alarm circuit. And an electromagnetic solenoid for operating the switch portions alternately, and the energization display means is the electromagnetic switch of the relay switch. By the detecting circuit connected in parallel with the solenoid is accomplished by issuing an alarm to detect and immediately breaking of the reinforcing wires.
This process allows the flexible hose to be replaced before it breaks, avoids any pre-scattering of the transported material that would otherwise be caused by the break, and at the same time schedules the flexible hose to be replaced. Therefore, the work efficiency is prevented from being reduced as much as possible.
[0011]
Further, in a normal state in which there is no broken portion in the metal wire of the flexible hose, the relay switch is in an activated state. Therefore, the detection circuit is always activated and the flexible hose is normally operated by the energization display means to the operator. Once it is recognized that it is in an abnormal state and the reinforcing wire is broken, the relay switch is turned off and the detection circuit is turned off.At the same time, the relay switch is switched to activate the alarm circuit, and a warning is issued. The display means can reliably notify the operator that an abnormality has occurred in the flexible hose.
[0013]
In addition, only one of the energization display means and the warning display means is always in operation, and it is completely avoided that both display means are activated or deactivated at the same time. It is possible to reliably recognize whether the hose is in a normal state or an abnormal state, and at the same time, an oversight of the occurrence of an abnormal situation is reliably avoided.
[0014]
In addition, a reliable operating state that is not affected by the external environment such as temperature and humidity can be obtained, and the simple switching of the switch unit can be performed.
[0016]
Hereinafter, an embodiment of a reinforcing wire breakage detecting device according to the present invention will be described in detail with reference to the drawings.
[0017]
DETAILED DESCRIPTION OF THE INVENTION
FIG. 1 is a schematic view of a reinforcing wire breakage detecting device according to the present invention, FIG. 2 is a perspective view of a reinforcing wire embedded in a peripheral wall of a flexible hose, and FIG. 3 is a flexible wire having a five-layer structure. It is a partially cutaway sectional view of a hose. FIG. 4 is a cross-sectional view of the flexible hose shown in FIG. 1 showing an initial stage in which the inner surface coating layer is worn by contact friction with a transfer object, and FIG. FIG. 6 is a cross-sectional view showing a state in which the inner reinforcing layer is worn and the reinforcing wire is exposed, and FIG. 6 is a cross-sectional view showing a state in which the reinforcing wire is further worn away from the state of FIG. 7 is a cross-sectional view showing a state in which wear further progresses from the state of FIG. 6 and the reinforcing wire is broken, and FIG. 8 further progresses from the state of FIG. 7 to progress to the outer surface coating layer. It is sectional drawing which shows the state by which flexible hose itself was damaged.
[0018]
Referring to FIG. 1, the length of the peripheral wall 101 of the flexible hose 100 to which the reinforcing wire breakage detecting device 1 according to the present invention is applied is restricted by a joint flange 102 made of metal at both ends.
[0019]
Further, as is apparent from FIG. 3, the peripheral wall has a five-layer structure, and from the innermost side, an inner surface coating layer 110 that is preferably made of rubber with which a moving object such as slurry is in direct contact, and an inner reinforcing layer that is preferably made of a polyester cord 108, a reinforcing wire 103 spirally wound over a predetermined length in which a steel wire is preferable, an intermediate layer 109 in which rubber is preferable, and an outer surface covering layer 110 in which canvas or rubber is preferable.
[0020]
In any case, since the reinforcing wire 103 is a conductive material, the layer contacting the inside and the outside must be an elastic material having electrical insulation. In use, a transport stream such as slurry passes through the through hole of the flexible hose 100 in the direction of arrow F. This type of flexible hose is generally commercially available and does not have any special structure.
[0021]
In FIGS. 4 to 9, the flow of the transported material is shown in order as the peripheral wall 101 is worn in the flexible hose. In FIG. 4, since the flow of the transported object always contacts the inner surface coating layer 107, the coating layer 107 is intensively worn particularly in a portion where the flow resistance is large, and the recess 111 is formed in the initial stage. In FIG. 5, the recessed portion 111 further proceeds to the inner reinforcing layer 108, and the reinforcing wire 103 and the intermediate layer 109 provided on the outer side thereof are exposed to the recessed portion 111. In FIG. 6, the flow of the transported material starts to wear the reinforcing wire 103 exposed in the recessed portion 111, and the exposed portion of the reinforcing wire 103 is reduced in diameter and becomes extremely fragile. In FIG. 7, the exposed portion of the reinforcing wire 103 is worn and broken. In this state, the breakage detection device 1 according to the present invention shown in FIG. 1 operates.
[0022]
Although it should not occur, the flow of the transported material further erodes the intermediate layer 109 and penetrates to the outer cover layer 110 as shown in FIG. 8, and the recess 111 finally develops into the opening 112. End up. In such a state, naturally, the transferred material in the flexible hose 100 leaks out from the opening 112. In this situation, the replacement work of the flexible hose 100 is unavoidable, and the time and labor required for the work become enormous. In addition, when the transported material is a dangerous material, the scattering from the damaged part has an immeasurable effect on the surrounding area. Therefore, the reinforcing wire breakage detection apparatus 1 and the damage prediction method using such an apparatus according to the present invention have been proposed in order to surely avoid the situation that should not occur as described above.
[0023]
Further, as is apparent from FIG. 2, both end portions 104 of the metal reinforcing wire 103 are tightly wound, and partially surround the cylindrical inner end portion 105 of the joint flange 102 from the outside, so that the joint flange A transition region is formed for securing the flexibility in the central region of the hose while at the same time stiffening with rigidity against the inner end portion 105. This configuration is common to commercially available flexible hoses. Furthermore, conductive lead wires 106 extending from the input terminal 10 through the peripheral wall 101 of the flexible hose 100 are connected to the both end portions 104.
[0024]
Further, the reinforcing wire breakage detecting device 1 according to the present invention will be described in detail with reference to FIG. The reinforcing wire breakage detecting device 1 is composed of a detection circuit 4 and an alarm circuit 5, which are connected in series to a common power source 2 and are provided for when an overcurrent flows in the circuit. The earth leakage breaker 3 is provided in front of the power source 2 for the safety of the apparatus. As a matter of course, the power supply 2 is equipped with a transformer, a rectifier, and the like, and supplies current to the entire apparatus with a stable voltage.
[0025]
The detection circuit 4 includes a relay switch 40. The relay switch 40 is described and illustrated as two parts composed of switch units 42 and 43 for convenience. In the present invention, essentially two contact points are provided. It is comprised with the changeover switch provided with. The two switch units 42 and 43 are arranged to operate the detection circuit 4 and the alarm circuit 5 alternately by one drive unit 41. The drive unit 41 is connected in parallel with energization display means 6 to be described later in the detection circuit 4 with respect to one supply line extending from the power source 2, and is itself preferably composed of an electromagnetic solenoid.
[0026]
And the detection circuit 4 is equipped with the electricity supply display means 6 preferably formed with photoelectric devices, such as a lamp | ramp. In this case, one side of the energization display means 6 is connected to one line extending from the same power source 2 as the drive unit 41 via one switch unit 42 in this embodiment. Further, the other wire extending from the power source 2 constituting the detection circuit 4 is connected to one end of a metal reinforcing wire 103 of the flexible hose 100 via a lead wire 106 extending from one input terminal 10 to reinforce. The other end of the wire 103 is connected to the other lead wire extending from the other input terminal 10. Further, the other input terminal 10 is connected to the drive unit 41 of the relay switch 40 and the other side of the energization display means 6. Of course, the other line connecting the other input terminal 10, the drive unit 41, and the energization display means 6 may be an apparatus ground.
[0027]
On the other hand, the alarm circuit 5 is preferably formed by a display or sounding device such as a light emitting diode, a lamp, a buzzer, and a chime on the same line as that of the detection circuit 4 extending from the power source 2 via the other switch unit 43. A closed circuit in which warning display means 7 are connected in series. In the configuration of the alarm circuit 5, the other switch unit 43 is alternately switched to one switch unit 42 of the detection circuit 4 depending on the operation and non-operation states of the drive unit 41 of the relay switch 40. .
[0028]
For example, when the drive unit 41 is in the activated state in response to the operating state of the detection circuit 4, one switch unit 42 is turned on and the energization display means 6 is also turned on. The unit 43 is turned off and the warning display means 7 is also turned off. On the contrary, as shown in FIG. 1, when the reinforcing wire 103 is disconnected, the detection circuit 4 is turned off, and at the same time, one switch unit 42 is also turned off, while the other switch unit 43 is turned on. The alarm circuit 5 is turned on and the warning display means is also activated.
[0029]
Therefore, when the reinforcing wire 103 is broken as shown in FIG. 3, the relay switch 40 is turned off, the detection circuit 4 is cut off, the energization display means 6 is deactivated, and at the same time, the relay switch 40 is turned off. As a result, the alarm circuit 5 is activated and the warning display means 7 is activated. With this configuration, in a normal state where the metal wire 103 of the flexible hose 100 does not have a broken portion, the relay switch 40 is in an operating state. It will be recognized that the flexible hose is in a normal state.
[0030]
On the other hand, once the abnormal condition occurs in which the reinforcing wire 103 is disconnected, the relay switch 40 is turned off and the detection circuit 4 is turned off. At the same time, the relay switch is switched to activate the alarm circuit 5. The warning display means 7 can reliably notify the operator that an abnormality has occurred in the flexible hose 100. Therefore, it is completely avoided that the energization display means 6 and the warning display means 7 are operated at the same time, and the operator always does not hesitate whether the flexible hose 100 is in a normal state or an abnormal state. It can be surely recognized, and at the same time, the oversight of the occurrence of an abnormal situation is surely avoided.
[0031]
According to the reinforcing wire breakage detecting device according to the present invention, a reliable operating state that is not influenced by the external environment such as temperature and humidity can be obtained by the configuration in which the drive unit 41 of the relay switch 40 is an electromagnetic solenoid. And with its simple configuration, it is possible to switch the switch part without error.
[0032]
According to the reinforcing wire breakage detecting device according to the present invention, the energization display means 6 and the warning means 7 are both formed of a photoelectric device or a combination of a photoelectric device and a warning device, so that the operator can Since the state can be easily and reliably identified by visual observation without resting hands even during work, it is possible to avoid a special burden on the operator for monitoring.
[0033]
【The invention's effect】
The flexible hose predicting method according to the present invention is a flexible hose in which a reinforcing metal wire spirally wound over a predetermined length in a peripheral wall is embedded between both ends of the metal wire. A detection circuit having an energization display means operated by a relay switch is connected in series with a power supply, and an alarm circuit having a warning display means similarly operated by a relay switch is connected in series with the power supply separately from the detection circuit, When the reinforcing wire breaks, the relay switch is turned off and the detection circuit is shut off to turn off the energizing display means. At the same time, the relay switch is also turned off to activate the alarm circuit and turn on the warning display means. And a relay switch that can be switched between a detection circuit and an alarm circuit, and an electromagnetic solenoid for alternately operating the switch unit. Is composed of a de energization display means, by the detecting circuit connected in parallel to the electromagnetic solenoid of the relay switch, so alert the detect and immediately breaking of the reinforcing wires, breakage of the reinforcing wire When it is detected, the flexible hose can be replaced prior to breakage, and the scattering of the transported material that may be caused by the breakage is avoided in advance, and at the same time, the flexible hose can be replaced in a scheduled manner. Therefore, a decrease in work efficiency is prevented as much as possible.
[Brief description of the drawings]
FIG. 1 is a schematic view of a reinforcing wire breakage detecting device according to the present invention.
FIG. 2 is a perspective view of a reinforcing wire embedded in a peripheral wall of a flexible hose.
FIG. 3 is a partially cutaway sectional view of a flexible hose having a five-layer structure.
4 is a cross-sectional view of the flexible hose shown in an initial stage in which the inner surface coating layer is worn by contact friction between the flexible hose shown in FIG. 1 and a transfer object.
5 is a cross-sectional view showing a state in which wear has progressed from the state of FIG. 4 to wear an inner reinforcing layer and a reinforcing wire is exposed. FIG.
6 is a cross-sectional view showing a state in which wear has further progressed from the state of FIG.
7 is a cross-sectional view showing a state in which wear has further progressed from the state of FIG. 6 and a reinforcing wire has been damaged. FIG.
FIG. 8 is a cross-sectional view showing a state where the flexible hose itself is damaged by further progressing from the state of FIG.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Reinforcing wire breakage detection device 2 Power supply 3 Earth leakage breaker 4 Detection circuit 5 Alarm circuit 6 Energization display means 7 Warning display means 10 Input terminal 40 Relay switch 41 Drive part 42 One switch part 43 The other switch part 100 Flexible hose 101 Peripheral wall 102 Joint flange 103 Reinforcing wire 104 Both ends 105 Inner end 106 Lead wire 107 Inner surface coating 108 Inner reinforcing layer 109 Intermediate layer 110 Outer surface coating layer 111 Recessed portion 112 Opening F Fluid flow

Claims (1)

A method for predicting the breakage of a flexible hose in which a reinforcing metal wire is spirally wound over a predetermined length in a peripheral wall ,
Between the both ends of the metal wire, a detection circuit having an energization display means operated by a relay switch is connected in series with a power supply, and an alarm circuit having a warning display means similarly operated by a relay switch is the detection circuit. Separately connected in series with the power supply,
When the reinforcing wire breaks, the relay switch is turned off and the detection circuit is shut off to turn off the energization display means. At the same time, the relay switch is turned off to activate the alarm circuit and turn on the warning display means. And the relay switch is composed of a switch part that can be switched between the detection circuit and the alarm circuit, and an electromagnetic solenoid for operating the switch part alternately, and the energization display Means in a detection circuit connected in parallel with the electromagnetic solenoid of the relay switch;
A method for predicting breakage of a flexible hose, wherein the breakage of the reinforcing wire is detected and an alarm is immediately issued .

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