Hinge zeroing structure of horizontal pendulum body of seismic instrument

Abstract

The utility model discloses a horizontal pendulum hinge zeroing structure of a seismic instrument. Relates to the seismometer field. The zero position of the horizontal pendulum body of the existing seismometer is influenced by factors such as temperature and altitude. The device comprises an upper base plate and a lower base plate, the upper base plate and the lower base plate are connected through two front hinge structures and a rear hinge structure, and a horizontal swing body hinge zeroing structure used for adjusting the angle of the upper base plate is connected between the upper base plate and the lower base plate; the horizontal pendulum hinge zero-setting structure comprises a zero-setting screw, a zero-setting nut, a motor, a horizontal zero-setting bearing upper fixing seat, a horizontal zero-setting bearing lower fixing seat, a motor fixing seat and a thrust bearing. The horizontal zero-setting bearing upper fixing seat is fixedly connected with the upper chassis, the horizontal zero-setting bearing lower fixing seat is fixedly connected with the lower chassis, the motor is connected with the motor fixing seat, a rotating head of the motor is fixedly connected with a small threaded rod through a jackscrew, and the small threaded rod is fixedly connected with the zero-setting threaded rod through a jackscrew. The horizontal pendulum body is applied to the field of seismic instrument horizontal pendulum bodies.

Description

TECHNICAL FIELD

[0001] The utility model relates to the field of seismograph monitoring, specifically relates to a seismograph horizontal pendulum body hinge zero adjustment structure. BACKGROUND

[0002] With the continuous improvement of the monitoring technology, people not only pursue the seismometer with higher technical indicators, more comprehensive product comprehensive characteristics, but also hope that the instrument can be more intelligent, and the unattended station can be remotely maintained.

[0003] With the continuous improvement of the monitoring technology, people not only pursue the seismometer with higher technical indicators, more comprehensive product comprehensive characteristics, but also hope that the instrument can be more intelligent, and the unattended station can be remotely maintained. The zero position of the seismometer horizontal pendulum body is affected by temperature and altitude and other factors. Temperature change will cause the thermal expansion and contraction of the material. The seismometer pendulum body and its supporting structure are mostly made of metal and other materials, and when the temperature changes, the size of these components changes. For example, when the temperature rises, the supporting part of the pendulum body may be lengthened or deformed, so that the balance position of the pendulum body, i.e. the zero position, changes; when the temperature decreases, it is the opposite. This thermal expansion and contraction changes the original spatial position relationship of the pendulum body, thereby affecting the zero position. At the same time, different altitudes will cause the difference of the gravitational acceleration. According to the law of universal gravitation, the gravity of the earth on the object is related to the distance (altitude). The higher the altitude, the smaller the gravitational acceleration. The balance and zero position of the seismometer horizontal pendulum body are closely related to the gravity, and the change of the gravitational acceleration will break the balance state of the pendulum body under the gravity and other forces (such as elastic restoring force, etc.). Moreover, the platforms on which the seismometers are installed in the stations are different in level, and there are also errors caused by human installation, which will all cause the change of the zero position of the pendulum body. CONTENT OF THE UTILITY MODEL

[0004] The utility model discloses in order to solve the zero position of the existing seismometer horizontal pendulum body is affected by temperature and altitude and other factors, therefore provides a seismograph horizontal pendulum body hinge zero adjustment structure.

[0005] The technical scheme of the utility model is:

[0006] A seismograph horizontal pendulum body hinge zero adjustment structure, which comprises an upper chassis and a lower chassis, the upper chassis and the lower chassis are connected by two front hinge structures and a rear hinge structure, and a horizontal pendulum body hinge zero adjustment structure for adjusting the angle of the upper chassis is connected between the upper chassis and the lower chassis.

[0007] The horizontal pendulum body hinge zero adjustment structure comprises a zero adjustment screw, a zero adjustment nut, a motor, a horizontal zero adjustment bearing upper fixed seat, a horizontal zero adjustment bearing lower fixed seat and a motor fixed seat, and a thrust bearing.

[0008] The upper horizontal zero adjustment bearing fixed seat is fixedly connected with the upper chassis, the lower horizontal zero adjustment bearing fixed seat is fixedly connected with the lower chassis, the motor is connected with the motor fixed seat, the rotating head of the motor is fixedly connected with a small threaded rod through a jackscrew, the small threaded rod is fixedly connected with the zero adjustment screw through a jackscrew, the zero adjustment screw and the zero adjustment nut are connected through threads, and the upper horizontal zero adjustment bearing fixed seat and the lower horizontal zero adjustment bearing fixed seat are respectively provided with a thrust bearing.

[0009] Further, the zero adjustment screw is provided with an external thread column, the external thread column of the zero adjustment screw is connected with the internal thread hole of the zero adjustment nut, the bottom of the zero adjustment screw is provided with a small threaded rod insertion slot, and a jackscrew hole is formed in the vertical direction of the small threaded rod insertion slot.

[0010] Further, the zero adjustment nut is provided with an internal thread hole, the internal thread hole is used in cooperation with the external thread column of the zero adjustment screw, and the zero adjustment nut is symmetrically connected with an insertion shaft close to the end.

[0011] Further, the rotating head of the motor is fixedly connected with the zero adjustment screw through the small threaded rod, when the motor rotates, the motor

[0012] The zero adjustment screw is driven to rotate in the zero adjustment nut through the small threaded rod, when the zero adjustment screw rotates in the zero adjustment nut, the zero adjustment nut is pushed to stretch and retract.

[0013] Further, the upper horizontal zero adjustment bearing fixed seat is provided with a hole for inserting the motor, the side surface of the upper horizontal zero adjustment bearing fixed seat is provided with a bolt mounting hole and a pressing plate insertion hole, a pressing plate is inserted into the pressing plate insertion hole, and the thrust bearing in the upper horizontal zero adjustment bearing fixed seat is pressed through the pressing plate.

[0014] Further, the lower horizontal zero adjustment bearing fixed seat is provided with a hole for inserting the end of the zero adjustment nut, the lower horizontal zero adjustment bearing fixed seat is provided with a pressing plate insertion hole which is the same as the pressing plate insertion hole of the upper horizontal zero adjustment bearing fixed seat, and a pressing plate is installed in the pressing plate insertion hole of the lower horizontal zero adjustment bearing fixed seat, so that the thrust bearing in the lower horizontal zero adjustment bearing fixed seat is pressed through the pressing plate.

[0015] Further, the rear hinge structure and the two front hinge structures are the same, and the rear hinge structure and the two front hinge structures all include the lower horizontal zero adjustment bearing fixed seat and the thrust bearing.

[0016] Further, the bottom of the upper chassis is fixedly connected with a rotating rod, and a plug on the rotating rod is inserted into a push bearing in a lower fixed seat of the horizontal zero adjustment bearing in the front hinge structure.

[0017] Further, the rotating angle of the upper chassis is ±5°.

[0018] Further, a screw rod insertion hole is formed in the upper chassis, and a screw rod is inserted into the screw rod insertion hole, and the top end of the screw rod is connected with a sensor control reed.

[0019] Compared with the prior art, the utility model has the following effects:

[0020] The horizontal pendulum hinge zero adjustment structure of the seismograph can be applied to an ITC-60 series wideband seismometer, an ITC-120 series very wideband seismometer and an ITC-360 series ultra wideband seismometer.

[0021] The upper chassis and the lower chassis are connected through two front hinge structures and one rear hinge structure, and the front hinge structure and the rear hinge structure each include a horizontal zero adjustment bearing lower fixed seat, so that when the motor rotates, the motor drives the zero adjustment screw rod to rotate through the small screw rod, the zero adjustment screw nut is pushed through the zero adjustment screw rod, thereby adjusting the distance between the zero adjustment screw rod and the zero adjustment screw nut, and the lower chassis 2 and the ground plate are fixed structures, so that when the distance between the zero adjustment screw rod 5 and the zero adjustment screw nut increases, the upper chassis 1 is driven to rotate through the horizontal zero adjustment bearing upper fixed seat, and the two front hinge structures are coaxial structures, so that when the length of the zero adjustment screw rod and the zero adjustment screw nut of the rear hinge structure changes, the upper chassis rotates, thereby achieving the purpose of adjusting the zero position of the horizontal pendulum. BRIEF DESCRIPTION OF DRAWINGS

[0022] Figure 1 is a structural schematic view of the utility model;

[0023] Figure 2 is a front view of Figure 1 ;

[0024] Figure 3 is an installation structural schematic view of the utility model and the seismograph;

[0025] Figure 4 is a sectional view of the horizontal pendulum hinge zero adjustment structure;

[0026] Figure 5 is a local enlarged view of B part in Figure 4 ;

[0027] Figure 6 is a connection schematic view of the front hinge structure and the upper chassis and the lower chassis;

[0028] Figure 7 is a structural schematic view of the screw inserted into the screw insertion hole;

[0029] Figure 8 is a structural schematic view of the zero adjustment screw;

[0030] Figure 9 is a sectional view of Figure 8 ;

[0031] Figure 10 is a sectional view of the zero adjustment nut;

[0032] Figure 11 is a top view of the upper fixing base of the horizontal zero adjustment bearing;

[0033] Figure 12 is a front view of the upper fixing base of the horizontal zero adjustment bearing;

[0034] Figure 13 is a top view of the lower fixing base of the horizontal zero adjustment bearing;

[0035] Figure 14 is a front view of the lower fixing base of the horizontal zero adjustment bearing;

[0036] Figure 15 is a structural schematic view of the rotating rod;

[0037] Figure 16 is a structural schematic view of the sensor control spring;

[0038] In the figure: 1, upper chassis, 2, lower chassis, 3, front hinge structure, 4, rear hinge structure, 5, zero adjustment screw, 6, zero adjustment nut, 7, motor. 8, upper fixing base of horizontal zero adjustment bearing, 9, lower fixing base of horizontal zero adjustment bearing, 10, motor fixing base, 11, thrust bearing, 12, pressing plate, 13, rotating rod, 14, screw insertion hole, 15, screw, 16, sensor control spring, 17, horizontal swing body hinge zero adjustment structure, 51, small threaded rod insertion slot, 52, jackscrew hole, 61, internal threaded hole, 81, bolt mounting hole, 82, pressing plate insertion hole. DETAILED DESCRIPTION

[0039] In order to make the purpose, technical scheme and advantages of the embodiments of the present application more clear, the technical scheme in the embodiments will be described clearly and completely below in combination with the drawings in the embodiments of the present application. The following embodiments are used to illustrate the present application, but not to limit the scope of the present application.

[0040] Specific embodiment one: in combination with Figure 1 and Figure 2The embodiment is illustrated, and the horizontal pendulum hinge zero adjustment structure of the seismic instrument of the embodiment comprises an upper chassis 1 and a lower chassis 2, the upper chassis 1 and the lower chassis 2 are connected through two front hinge structures 3 and one rear hinge structure 4, and a horizontal pendulum hinge zero adjustment structure 17 for adjusting the angle of the upper chassis 1 is connected between the upper chassis 1 and the lower chassis 2;

[0041] The horizontal pendulum hinge zero adjustment structure 17 comprises a zero adjustment screw 5, a zero adjustment nut 6, a motor 7, a horizontal zero adjustment bearing upper fixing seat 8, a horizontal zero adjustment bearing lower fixing seat 9, a motor fixing seat 10 and a thrust bearing 11.

[0042] The horizontal zero adjustment bearing upper fixing seat 8 is fixedly connected with the upper chassis 1, the horizontal zero adjustment bearing lower fixing seat 9 is fixedly connected with the lower chassis 2, the motor 7 is connected with the motor fixing seat 10, the rotating head of the motor 7 is fixedly connected with a small threaded rod through a jackscrew, the small threaded rod is fixedly connected with the zero adjustment screw 5 through the jackscrew, the zero adjustment screw 5 and the zero adjustment nut 6 are connected through threads, and the horizontal zero adjustment bearing upper fixing seat 8 and the horizontal zero adjustment bearing lower fixing seat 9 are respectively provided with the thrust bearing 11. The motor fixing seat 10 is arranged in the horizontal zero adjustment bearing upper fixing seat 8, the shaft of the motor fixing seat 10 is inserted into the thrust bearing 11 in the horizontal zero adjustment bearing upper fixing seat 8, the shaft of the zero adjustment nut 6 is inserted into the thrust bearing 11 in the horizontal zero adjustment bearing lower fixing seat 9, the zero adjustment screw 5 is arranged above the zero adjustment nut 6, and the zero adjustment screw 5 and the zero adjustment nut 6 form a propulsion mechanism through thread connection.

[0043] The lower chassis 2 is fixed on a ground plate, and a groove structure for mounting the rear hinge structure 4 is arranged on the lower chassis 2, and the horizontal zero adjustment bearing lower fixing seat 9 of the rear hinge structure 4 is arranged in the groove structure, and the bottom of the horizontal zero adjustment bearing lower fixing seat 9 is fixed in the groove structure.

[0044] Symmetrical groove structures for mounting the front hinge structure 3 are arranged on the bottom of the upper chassis 1, and the plane of the rotating rod 13 is fixed in the groove structure.

[0045] Specific implementation method two: combined Figure 1 and Figure 2 The embodiment is illustrated, and the horizontal pendulum hinge zero adjustment structure of the seismic instrument of the embodiment comprises an upper chassis 1 and a lower chassis 2, the upper chassis 1 and the lower chassis 2 are connected through two front hinge structures 3 and one rear hinge structure 4, and a horizontal pendulum hinge zero adjustment structure 17 for adjusting the angle of the upper chassis 1 is connected between the upper chassis 1 and the lower chassis 2;

[0046] The zero adjustment screw 5 is mainly used in cooperation with the zero adjustment nut 6, the outer threaded column of the zero adjustment screw 5 cooperates with the inner threaded hole 61 of the zero adjustment nut 6, when the zero adjustment screw 5 rotates in the inner threaded hole 61 of the zero adjustment nut 6, the zero adjustment nut 6 is pushed by the zero adjustment screw 5, so as to adjust the distance between the zero adjustment screw 5 and the zero adjustment nut 6.

[0047] Specific implementation three: in combination Figure 1 And Figure 2 This embodiment is described, a horizontal pendulum hinge zero adjustment structure of a seismic instrument, the zero adjustment nut 6 is provided with an inner threaded hole 61, the inner threaded hole 61 cooperates with the outer threaded column of the zero adjustment screw 5, the zero adjustment nut 6 is symmetrically connected with the shaft near the end position.

[0048] The cylindrical rod of the zero adjustment nut 6 is symmetrically connected with two shafts, the cylindrical barrel of the zero adjustment nut 6 is provided with an inner threaded hole 61, wherein the inner threaded hole 61 mainly screws the outer threaded column of the zero adjustment screw 5, and the shaft of the zero adjustment nut 6 is installed in the thrust bearing 11, so that the zero adjustment nut 6 can rotate on the thrust bearing 11.

[0049] Specific implementation four: in combination Figure 1 And Figure 2 This embodiment is described, a horizontal pendulum hinge zero adjustment structure of a seismic instrument, the rotating head of the motor 7 is fixedly connected with the zero adjustment screw 5 through a small threaded rod, when the motor 7 rotates, the motor 7 drives the zero adjustment screw 5 to rotate in the zero adjustment nut 6 through the small threaded rod, when the zero adjustment screw 5 rotates in the zero adjustment nut 6, the zero adjustment nut 6 is pushed to stretch and retract.

[0050] The small threaded rod is a threaded column structure, the rotating head of the motor 7 is fixedly connected with the small threaded rod through a jack, the small threaded rod is fixedly connected with the zero adjustment screw 5 through the jack, through the above structure, the motor 7 rotates to drive the zero adjustment screw 5 to rotate through the small threaded rod, since the zero adjustment nut 6 cannot move, when the zero adjustment screw 5 rotates in the zero adjustment nut 6, the upper chassis 1 is driven to rotate.

[0051] Specific implementation five: in combination Figure 1 And Figure 2 This embodiment is described, a horizontal pendulum hinge zero adjustment structure of a seismic instrument, the horizontal zero adjustment bearing upper fixed seat 8 is provided with a hole position for inserting the motor 7, the side surface of the horizontal zero adjustment bearing upper fixed seat 8 is provided with a bolt mounting hole 81 and a pressing plate insertion hole 82, the pressing plate insertion hole 82 is inserted with a pressing plate 12, the thrust bearing 11 in the horizontal zero adjustment bearing upper fixed seat 8 is pressed tightly through the pressing plate 12.

[0052] Specific implementation six: in combination Figure 1 AndFigure 2 The present embodiment is a horizontal pendulum hinge zero adjustment structure of a seismic instrument. A hole position for inserting an end of a zero adjustment nut 6 is formed on a lower fixed seat 9 of a horizontal zero adjustment bearing. A pressing plate insertion hole 82 identical to a pressing plate insertion hole 82 of an upper fixed seat 8 of the horizontal zero adjustment bearing is formed on the lower fixed seat 9 of the horizontal zero adjustment bearing. A pressing plate 12 is installed in the pressing plate insertion hole 82 of the lower fixed seat 9 of the horizontal zero adjustment bearing. The pressing plate 12 is used to compress a thrust bearing 11 in the lower fixed seat 9 of the horizontal zero adjustment bearing.

[0053] Specific embodiment seven: Figure 1 and Figure 2 The present embodiment is a horizontal pendulum hinge zero adjustment structure of a seismic instrument. A rear hinge structure 4 and two front hinge structures 3 are identical. The rear hinge structure 4 and the two front hinge structures 3 each include a horizontal zero adjustment bearing lower fixed seat 9 and a thrust bearing 11.

[0054] A hole position for inserting the zero adjustment nut 6 in the horizontal zero adjustment bearing lower fixed seat 9 is larger than a diameter of a cylindrical tube of the zero adjustment nut 6. Therefore, when an insertion shaft of the zero adjustment nut 6 rotates in the thrust bearing 11, the zero adjustment nut 6 has a rotating space.

[0055] Specific embodiment eight: Figure 1 and Figure 2 The present embodiment is a horizontal pendulum hinge zero adjustment structure of a seismic instrument. A rotating rod 13 is fixedly connected to a bottom of an upper chassis 1. A plug on the rotating rod 13 is inserted into the thrust bearing 11 of the horizontal zero adjustment bearing lower fixed seat 9 in the front hinge structure 3.

[0056] The rotating rod 13 is fixedly installed on a top flat surface of the rotating rod 13 and a groove of the bottom of the upper chassis 1. An insertion shaft of the rotating rod 13 is inserted into the thrust bearing 11. The rotating rod 13 can rotate in the horizontal zero adjustment bearing lower fixed seat 9 in the front hinge structure 3.

[0057] Specific embodiment nine: Figure 1 and Figure 2 The present embodiment is a horizontal pendulum hinge zero adjustment structure of a seismic instrument. A rotating angle of the upper chassis 1 is ±5°. A screw rod insertion hole 14 is formed on the upper chassis 1. A screw rod 15 is inserted into the screw rod insertion hole 14. A top end of the screw rod 15 is connected to a sensor control spring piece 16.

[0058] A diameter of the screw rod insertion hole 14 of the upper chassis 1 is larger than a diameter of the screw rod 15. The sensor control spring piece 16 is connected to the screw rod 15 below. The screw rod 15 is fixed to the lower chassis 2. Therefore, when the upper chassis 1 rotates through the horizontal pendulum hinge zero adjustment structure, the upper chassis 1 can be finely adjusted to ±5° through the limitation of the screw rod 15 by the screw rod insertion hole 14.

[0059] DETAILED DESCRIPTION Figure 1 and Figure 2 Figure 1 Figure 2 The present embodiment is a horizontal pendulum hinge zero adjustment structure of a seismic instrument,

[0060] The upper chassis 1 and the lower chassis 2 are connected by two front hinge structures 3 and a rear hinge structure 4, and the front hinge structure 3 and the rear hinge structure 4 respectively include a horizontal zero adjustment bearing lower fixing seat 9, so that when the motor 7 rotates, the motor 7 drives the zero adjustment screw 5 to rotate through a small threaded rod, the zero adjustment screw 5 pushes the zero adjustment nut 6, thereby adjusting the distance between the zero adjustment screw 5 and the zero adjustment nut 6, and the lower chassis 2 and the ground are fixed structures, so that when the distance between the zero adjustment screw 5 and the zero adjustment nut 6 increases, the upper chassis 1 is driven to rotate by the horizontal zero adjustment bearing upper fixing seat 8, and the two front hinge structures 3 are coaxial structures, so that when the length of the zero adjustment screw 5 and the zero adjustment nut 6 of the rear hinge structure 4 changes, the upper chassis 1 rotates, thereby achieving the purpose of adjusting the zero position of the horizontal pendulum.

[0061] The above is only a preferred embodiment of the present application, and does not limit the present application in any form. Although the present application has been disclosed as above with a preferred embodiment, it is not intended to limit the present application. Any skilled person in the art can make some changes or modifications to the above disclosed technical content without departing from the technical solution of the present application, and the equivalent embodiments with equivalent changes are equivalent. Any simple modification, equivalent replacement and improvement of the above embodiments within the technical solution of the present application, the technical essence of the present application, the spirit and principles of the present application, all still belong to the protection scope of the technical solution of the present application.

Claims

1. A seismic instrument horizontal pendulum hinge zeroing structure, which consists of an upper chassis (1) and a lower chassis (2), and the upper chassis (1) and the lower chassis (2) are connected by two front hinge structures (3) and a rear hinge structure (4), characterized in that, The horizontal swing body hinge zero setting structure (17) is connected between the upper chassis (1) and the lower chassis (2) and is used for adjusting the angle of the upper chassis (1); The horizontal swing body hinge zero setting structure (17) comprises a zero setting screw (5), a zero setting nut (6), a motor (7), a horizontal zero setting bearing upper fixing seat (8), a horizontal zero setting bearing lower fixing seat (9), a motor fixing seat (10) and a thrust bearing (11). The horizontal zero setting bearing upper fixing seat (8) is fixedly connected with the upper chassis (1), the horizontal zero setting bearing lower fixing seat (9) is fixedly connected with the lower chassis (2), the motor (7) is connected with the motor fixing seat (10), the rotating head of the motor (7) is fixedly connected with a small threaded rod through a jackscrew, the small threaded rod is fixedly connected with the zero setting screw (5) through a jackscrew, the zero setting screw (5) and the zero setting nut (6) are connected through threads, the horizontal zero setting bearing upper fixing seat (8) and the horizontal zero setting bearing lower fixing seat (9) are respectively provided with the thrust bearing (11) therein, wherein the motor fixing seat (10) is arranged in the horizontal zero setting bearing upper fixing seat (8), a shaft inserted into the thrust bearing (11) in the horizontal zero setting bearing upper fixing seat (8) is arranged on the motor fixing seat (10), a shaft inserted into the thrust bearing (11) in the horizontal zero setting bearing lower fixing seat (9) is arranged on the zero setting nut (6), the zero setting screw (5) is arranged above the zero setting nut (6), and the zero setting screw (5) and the zero setting nut (6) form a propulsion mechanism through thread connection.

2. The zero-setting structure for a horizontal pendulum assembly of seismic equipment according to claim 1, characterized in that, The zero setting screw (5) is provided with an external thread column, and the external thread column of the zero setting screw (5) is connected with an internal thread hole (61) of the zero setting nut (6).

3. The seismic instrument horizontal pendulum hinged zero structure of claim 2, wherein, The zero setting nut (6) is provided with the internal thread hole (61), and the internal thread hole (61) is used in cooperation with the external thread column of the zero setting screw (5).

4. The seismic instrument horizontal pendulum hinged zero structure of claim 1, wherein, The rotating head of the motor (7) is fixedly connected with the zero setting screw (5) through the small threaded rod, when the motor (7) rotates, the motor (7) The zero setting screw (5) is driven to rotate in the zero setting nut (6) through the small threaded rod, when the zero setting screw (5) rotates in the zero setting nut (6), the zero setting nut (6) is pushed to stretch and contract.

5. The seismic instrument horizontal pendulum hinged zero structure of claim 1, wherein, The horizontal zero setting bearing upper fixing seat (8) is provided with a hole position for inserting the motor (7), the side surface of the horizontal zero setting bearing upper fixing seat (8) is provided with a bolt mounting hole (81) and a pressing plate insertion hole (82), a pressing plate (12) is inserted into the pressing plate insertion hole (82), and the thrust bearing (11) in the horizontal zero setting bearing upper fixing seat (8) is compressed through the pressing plate (12).

6. The seismic instrument horizontal pendulum hinged zero structure of claim 1, wherein, The horizontal zero adjustment bearing lower fixing base (9) is provided with a hole position for inserting the end of the zero adjustment nut (6), and the horizontal zero adjustment bearing lower fixing base (9) is provided with the same pressing plate insertion hole (82) as the horizontal zero adjustment bearing upper fixing base (8), and the pressing plate insertion hole (82) of the horizontal zero adjustment bearing lower fixing base (9) is provided with a pressing plate (12), and the thrust bearing (11) in the horizontal zero adjustment bearing lower fixing base (9) is pressed by the pressing plate (12).

7. The seismic instrument horizontal pendulum hinged zero structure of claim 1, wherein, The rear hinge structure (4) and the two front hinge structures (3) are the same, and the rear hinge structure (4) and the two front hinge structures (3) all include the horizontal zero adjustment bearing lower fixing base (9) and the thrust bearing (11).

8. The seismic instrument horizontal pendulum hinged zero structure of claim 1, wherein, The bottom of the upper chassis (1) is fixedly connected with a rotating rod (13), and the plug on the rotating rod (13) is inserted into the thrust bearing (11) of the horizontal zero adjustment bearing lower fixing base (9) in the front hinge structure (3).

9. The seismic instrument horizontal pendulum hinged zero structure of claim 8, wherein, The rotating angle of the upper chassis (1) is ±5°.

10. The seismic instrument horizontal pendulum hinged zero structure of claim 9, wherein, The upper chassis (1) is provided with a screw insertion hole (14), and the screw insertion hole (14) is inserted with a screw (15), and the top end of the screw (15) is connected with a sensor control reed (16).

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