CN210605003U

CN210605003U - Rotating shaft type angle adjusting mechanism in force balance accelerometer

Info

Publication number: CN210605003U
Application number: CN201921661160.5U
Authority: CN
Inventors: 孙丽娟; 李鹏; 魏铁春; 容娟
Original assignee: Individual
Current assignee: Individual
Priority date: 2019-10-07
Filing date: 2019-10-07
Publication date: 2020-05-22
Anticipated expiration: 2029-10-07

Abstract

The utility model discloses a pivot formula angle adjustment mechanism in force balance accelerometer, it includes pivot, pivot seat, clamping screw and manual zero setting mechanism, and the pivot seat is installed in the main part, and pivot seat upper end is provided with the open slot, and during the pivot hole in the pivot seat was inserted in the pivot, clamping screw pressed from both sides tight open slot, makes the pivot pressed from both sides tightly after the open slot presss from both sides tightly, and manual zero setting mechanism installs in the pivot left side, and manual zero setting mechanism cooperatees with the spanner. The utility model discloses a pivot formula angle adjustment mechanism carries out accurate, reliable regulation to the balanced gesture of the moving system of force balance accelerometer. The rotating shaft type angle adjusting mechanism is simple in structure, easy to maintain and long in service life, and ensures that the force balance accelerometer is used for a long time under severe outdoor conditions.

Description

Rotating shaft type angle adjusting mechanism in force balance accelerometer

Technical Field

The utility model relates to the technical field of strong earthquake observation, which can also be applied to the fields of building safety, bridge safety and the like; in particular to a rotating shaft type angle adjusting mechanism in a force balance accelerometer.

Background

The strong earthquake observation is an important component of earthquake observation, and the force balance accelerometer is a measuring instrument for surface vibration when the strong earthquake occurs and provides scientific basis for analyzing earthquake strong earthquake data. One of the most important measuring instruments in earthquake strong shock observation is widely applied to earthquake strong shock observation and analysis. And a scientific basis is provided for organizing a large earthquake emergency system for earthquake relief.

The force balance accelerometer is formed by installing three sensors which are independently divided, a feedback circuit and a control circuit are arranged in the force balance accelerometer, and a rotating shaft type angle adjusting mechanism is adopted to accurately and reliably adjust the balance posture of a moving system of the force balance accelerometer.

The force balance accelerometer consists of a fixed system, a movable system and a feedback system. The fixed system is a stable carrier of the movable system and the feedback system, the movable system is connected with the fixed system through two reeds in a hinged mode, and the feedback system is installed on the fixed system.

The movable system is a force balance accelerometer precision movable part, when the accelerometer is in a static balance position, the fixed polar plate is required to be ensured to be in the middle position of the upper movable polar plate and the lower movable polar plate and to be parallel to each other, and the absolute values of excitation voltages at two sides of the fixed polar plate are ensured to be equal, namely the movable system is in a balance state. The accelerometer is allowed to be in an equilibrium position at the time of the earthquake to obtain the maximum dynamic range of recording. Therefore, when the accelerometer is initially installed at a measuring position, the relative position of the up-down moving pole plate and the fixed pole plate needs to be adjusted through a simple and reliable angle adjusting mechanism. The angle adjustment mechanism also ensures that the accelerometer always ensures that the movable system is in a balanced state during long-time uninterrupted operation.

The angle adjusting mechanism in the existing force balance accelerometer has the disadvantages of complex structure, high mechanical manufacturing process requirement and high maintenance difficulty.

To sum up, the utility model relates to a pivot formula angle adjustment mechanism for in the force balance accelerometer.

SUMMERY OF THE UTILITY MODEL

To the not enough of existence on the prior art, the utility model aims to provide a pivot formula angle adjustment mechanism in the balanced accelerometer of power, this pivot formula angle adjustment mechanism carries out accurate, reliable regulation to the balanced gesture of the moving system of the balanced accelerometer of power. The rotating shaft type angle adjusting mechanism is simple in structure, easy to maintain and long in service life, and ensures that the force balance accelerometer is used for a long time under severe outdoor conditions.

In order to achieve the above purpose, the present invention is realized by the following technical solution: a rotating shaft type angle adjusting mechanism in a force balance accelerometer comprises a rotating shaft, a rotating shaft seat, a clamping screw and a manual zero setting mechanism, wherein the rotating shaft seat is installed on a main body, an open slot is formed in the upper end of the rotating shaft seat, the rotating shaft is inserted into a rotating shaft hole in the rotating shaft seat, the clamping screw clamps the open slot, the rotating shaft is clamped after the open slot is clamped, the manual zero setting mechanism is installed on the left side of the rotating shaft, and the manual zero setting mechanism is matched with a wrench; the left end and the right end of the rotating shaft are provided with positions for mounting reeds; the manual zero setting mechanism is combined with a millivoltmeter to measure feedback voltage to adjust the positions of the upper movable polar plate, the lower movable polar plate and the fixed polar plate; the upper movable polar plate, the lower movable polar plate and the fixed polar plate form a capacitance transducer, a coil is fixed on the lower movable polar plate, the coil, the magnetic steel and the magnetic yoke are concentrically arranged, and the upper movable polar plate and the lower movable polar plate are connected and fixed through six pins; the upper movable polar plate, the lower movable polar plate and the coil also form a movable system of the force balance accelerometer, the movable system is hinged with a fixed system of the force balance accelerometer through two reeds, and two ends of each reed are respectively arranged on the rotating shaft and the upper movable polar plate.

Preferably, the opening groove is opened upwards.

The force balance accelerometer of the utility model consists of a fixed system, a movable system and a feedback system; the fixing system comprises a main body, a rotating shaft seat, a clamping screw, a manual zero setting mechanism, a fixed polar plate, magnetic steel and a magnetic yoke. The movable system comprises an upper movable polar plate, a lower movable polar plate and a coil, wherein the coil is arranged on the lower movable polar plate, and the upper movable polar plate and the lower movable polar plate are fixedly connected through six copper support columns. The movable system and the fixed system are hinged by two reeds. The feedback system consists of a feedback circuit which is fixed on the fixing system main body.

When the seismic waves act on the accelerometer fixing system, the fixing system moves along with the seismic waves, and at the moment, the movable system is still static because the movable system is connected with the fixing system by adopting the hinge joint of the two reeds, so that the fixing system and the movable system generate relative displacement. The magnetic steel and the magnetic yoke installed in the fixed system form a magnetic field, and due to the relative displacement of the fixed system and the movable system, the coil fixed on the movable polar plate under the movable system cuts magnetic lines of force formed by the magnetic steel and the magnetic yoke of the fixed system, so that feedback current is generated. The feedback current is transmitted to the control circuit through the copper support column between the upper moving electrode plate and the lower moving electrode plate, and the control circuit completes processing of the feedback current signal. The fixed polar plate in the fixed system and the upper and lower movable polar plates of the movable system form a variable capacitor. Because the relative displacement is generated between the fixed polar plate of the fixed system and the upper and lower movable polar plates of the movable system, the displacement change is converted into the electrostatic capacitance change by the capacitor, so that a certain excitation voltage is generated between the polar plates, and the voltage signal is transmitted to the control circuit for processing through the feedback circuit. Each feedback signal is processed through the control circuit, so that an output voltage signal is obtained, the magnitude of the signal is proportional to the movement displacement of the up-down moving polar plate, and the displacement of the up-down moving polar plate is proportional to the acceleration of the overall movement of the accelerometer. Thus, the output voltage is the acceleration of the displacement of the accelerometer due to the seismic vibrations. This output voltage is transmitted to a seismic data acquisition system for seismic analysis. The above is the working principle of the force balance accelerometer.

According to the working principle of the force balance accelerometer. The movable system is a force balance accelerometer precision movable part, when the accelerometer is in a static balance position, the fixed polar plate is required to be ensured to be in the middle position of the upper movable polar plate and the lower movable polar plate and to be parallel to each other, and the absolute values of excitation voltages at two sides of the fixed polar plate are ensured to be equal, namely the movable system is in a balance state. The accelerometer can be in an equilibrium position at the time of earthquake occurrence to obtain the maximum recording dynamic range. Therefore, when the accelerometer is initially installed at a measuring position, the relative position of the up-down moving pole plate and the fixed pole plate needs to be adjusted through a simple and reliable angle adjusting mechanism. The angle adjustment mechanism also ensures that the accelerometer always ensures that the movable system is in a balanced state during long-time uninterrupted operation.

The utility model has the advantages that: the utility model discloses can carry out accurate, reliable regulation to the balanced gesture of the moving system of the balanced accelerometer of power. The rotating shaft type angle adjusting mechanism is simple in structure, easy to maintain and long in service life, and ensures that the force balance accelerometer is used for a long time under severe outdoor conditions.

Drawings

The present invention will be described in detail with reference to the accompanying drawings and specific embodiments;

fig. 1 is a schematic structural view of the present invention;

fig. 2 is a schematic structural diagram of a capacitive transducer in a force-balanced accelerometer according to the present invention.

Detailed Description

In order to make the technical means, creation features, achievement purposes and functions of the present invention easy to understand, the present invention is further described below with reference to the following embodiments.

Referring to fig. 1-2, the following technical solutions are adopted in the present embodiment: the force balance accelerometer consists of a fixed system and a movable system, wherein the fixed system comprises a main body 1, a rotating shaft type angle adjusting mechanism (a rotating shaft 2, a rotating shaft seat 3, a clamping screw 4, a manual zero setting mechanism 5), a fixed polar plate 9, magnetic steel 10 and a magnetic yoke 11; the movable system consists of an upper movable polar plate 7, a lower movable polar plate 8 and a coil 12, wherein the coil is arranged on the lower movable polar plate 8, and the upper movable polar plate 7 and the lower movable polar plate 8 are fixedly connected through six pins; the movable system is hinged with the fixed system through two reeds 6, one end of each reed 6 is installed on the rotating shaft 2, and the other end of each reed 6 is installed on the upper movable polar plate 7.

It is worth noting that the upper movable polar plate 7, the lower movable polar plate 8 and the fixed polar plate 9 form a capacitance transducer. The coil 12 is fixed on the lower movable polar plate 8 and is concentric with the magnetic steel 10 and the magnetic yoke 11.

The pivot type angle adjusting mechanism comprises pivot 2, pivot seat 3, clamping screw 4, manual zero set mechanism 5, and pivot seat 3 is installed on

main part

1, and 3 upper ends of pivot seat are provided with the open slot 31 that makes progress, and during pivot hole 32 in pivot seat 3 was inserted to pivot 2, the open slot 31 that makes progress of pivot seat was pressed from both sides tight through clamping screw 4, and then pressed from both sides tight pivot 2 through the open slot 31 that presss from both sides tightly.

In practical use, the manual zero setting mechanism 5 is installed on the left side of the rotating shaft 2, positions among the upper movable polar plate 7, the lower movable polar plate 8 and the fixed polar plate 9 can be accurately adjusted by pulling the manual zero setting mechanism 5 and measuring feedback voltage by combining a millivoltmeter, the fixed polar plate 9 is ensured to be positioned in the middle of the upper movable polar plate 7 and the lower movable polar plate 8 and to be parallel to each other, absolute values of excitation voltages on two sides of the fixed polar plate 9 are ensured to be equal, and namely, the movable system is in a balanced state.

The rotating shaft of the embodiment is arranged in the rotating shaft seat hole, the upper end of the rotating shaft seat hole is opened, and the clamping force of the rotating shaft seat on the rotating shaft is adjusted to ensure that the force balance accelerometer moving system is in a balance position through the matching between the rotating shaft and the rotating shaft seat and the size of the opening of the rotating shaft seat. The rotating shaft is provided with a positioning structure, and the force balance accelerometer moving system is ensured to be in a balance position through axial positioning of the rotating shaft and the rotating shaft seat.

The present embodiment is a rotary shaft angle adjustment for use in a force balanced accelerometer, the angle adjustment mechanism being capable of accurately and reliably adjusting the equilibrium attitude of the moving system of the force balanced accelerometer and allowing the accelerometer to remain in a balanced position during long-term uninterrupted operation.

The basic principles and the main features of the invention and the advantages of the invention have been shown and described above. It will be understood by those skilled in the art that the present invention is not limited to the above embodiments, and that the foregoing embodiments and descriptions are provided only to illustrate the principles of the present invention without departing from the spirit and scope of the present invention. The scope of the invention is defined by the appended claims and equivalents thereof.

Claims

1. A rotating shaft type angle adjusting mechanism in a force balance accelerometer is characterized by comprising a rotating shaft (2), a rotating shaft seat (3), a clamping screw (4) and a manual zero setting mechanism (5), wherein the rotating shaft seat (3) is installed on a main body (1), an open slot (31) is formed in the upper end of the rotating shaft seat (3), the rotating shaft (2) is inserted into a rotating shaft hole (32) in the rotating shaft seat (3), the open slot (31) is clamped by the clamping screw (4), the rotating shaft (2) is clamped after the open slot (31) is clamped, the manual zero setting mechanism (5) is installed on the left side of the rotating shaft (2), and the manual zero setting mechanism (5) is matched with a spanner; the left end and the right end of the rotating shaft (2) are provided with positions for mounting reeds; the manual zero setting mechanism (5) is combined with a millivoltmeter to measure feedback voltage to adjust the positions among the upper movable polar plate (7), the lower movable polar plate (8) and the fixed polar plate (9); the upper movable polar plate (7), the lower movable polar plate (8) and the fixed polar plate (9) form a capacitance transducer, a coil (12) is fixed on the lower movable polar plate (8), the coil (12), the magnetic steel (10) and the magnetic yoke (11) are concentrically arranged, and the upper movable polar plate (7) and the lower movable polar plate (8) are fixedly connected through six pins; the upper movable polar plate (7), the lower movable polar plate (8) and the coil (12) further form a movable system of the force balance accelerometer, the movable system is hinged with a fixed system of the force balance accelerometer through two reeds (6), and two ends of each reed (6) are respectively installed on the rotating shaft (2) and the upper movable polar plate (7).

2. A rotary shaft type angle adjustment mechanism in a force balance accelerometer according to claim 1, wherein the open slot (31) is opened upwards.