A zeroing device for deep well seismometer

Abstract

This specification provides a zeroing device for a deep-well seismometer, the deep-well seismometer includes a three-way pendulum, each pendulum includes a pendulum bracket and a pendulum, the bottom of the pendulum bracket is connected to the pendulum through a cross spring, and the zeroing device includes: a driving unit, a transmission mechanism and a zeroing spring; the power end of the driving unit is connected to one end of the zeroing spring through the transmission mechanism, and the other end of the zeroing spring is connected to the pendulum; the driving unit moves, and the zeroing spring is deformed through the transmission mechanism, and the zeroing spring drives the pendulum to move to zero position. This specification can realize the zeroing of a deep-well seismometer.

Description

Technical Field

[0001] The present invention relates to the field of earthquake observation technology, and in particular to a zeroing device for a deep well seismometer. Background Art

[0002] The deep-well seismometer is a precision observation instrument used for deep-well observation. It can obtain excellent observation data due to its environmental advantages such as low noise and interference in the observation environment. After the deep-well seismometer is installed in the deep well, it needs to be zeroed first to ensure normal working condition. In order to achieve the zeroing of the deep-well seismometer, it is necessary to fully consider the installation conditions of the deep well. On the one hand, there is a well inclination in the deep well, which requires the deep-well seismometer to have a large zeroing range. On the other hand, the underground space is very small, and the movable range of the deep-well seismometer is very small. It is impossible to achieve zeroing by adjusting the overall installation posture of the pendulum. Third, the deep-well seismometer needs to have an automatic zeroing function. Summary of the invention

[0003] In view of this, the purpose of this specification is to provide a zeroing device for a deep well seismometer, which can realize the zeroing function of the deep well seismometer.

[0004] Based on the above purpose, one or more embodiments of this specification provide a zeroing device for a deep well seismometer, the deep well seismometer includes a three-way pendulum, each pendulum includes a pendulum bracket and a pendulum, the bottom of the pendulum bracket is connected to the pendulum through a cross spring, and the zeroing device includes: a driving unit, a transmission mechanism and a zeroing spring;

[0005] The power end of the driving unit is connected to one end of the zero-adjusting spring through the transmission mechanism, and the other end of the zero-adjusting spring is connected to the pendulum;

[0006] The driving unit is in motion, and the zeroing reed is deformed through the transmission mechanism, and the zeroing reed drives the pendulum to move to the zero position.

[0007] Optionally, the transmission mechanism includes a turbine, a worm gear, a zero adjustment screw, a zero adjustment lever, a zero adjustment lever, and a zero adjustment shaft, and the power end of the drive unit is connected to the zero adjustment reed through the worm gear, the turbine, the zero adjustment screw, the zero adjustment lever, the zero adjustment lever, and the zero adjustment shaft.

[0008] Optionally, the zeroing spring is a curved spring with elastic force, one end of the zeroing spring is connected to the zeroing shaft, and the other end of the zeroing spring is connected to the pendulum. The zeroing spring can be driven by force to swing the pendulum around the cross spring, and a zeroing range of 5 degrees can be achieved.

[0009] Optionally, the device further comprises:

[0010] A zero position detection unit, used to detect a position signal of the pendulum;

[0011] A control unit is used to determine a control signal for controlling the action of the driving unit according to the position signal; the control unit comprises:

[0012] an analog-to-digital conversion circuit, used for converting the position signal into a digital position signal;

[0013] The processing unit is used to determine a control signal for controlling the action of the driving unit according to the digital position signal.

[0014] Optionally, the processing unit includes:

[0015] A position determination module, used to determine whether the pendulum is within a coarse adjustment position range according to the digital position signal;

[0016] The coarse adjustment module is used to determine a coarse adjustment control signal when it is determined that the pendulum is within the coarse adjustment position range.

[0017] Optionally, the coarse adjustment module is used to determine a first deviation distance between a current position of the pendulum and a balance position according to the digital position signal, and determine the coarse adjustment control signal according to the first deviation distance.

[0018] Optionally, the processing unit includes:

[0019] A position determination module, used to determine whether the pendulum is within a fine adjustment position range according to the digital position signal;

[0020] The fine adjustment module is used to determine a fine adjustment control signal when it is determined that the pendulum is within the fine adjustment position range.

[0021] Optionally, the fine-tuning module is used to determine a second deviation position between the current position of the pendulum and the equilibrium position according to the digital position signal, and determine the fine-tuning control signal according to the second deviation distance.

[0022] Optionally, the processing unit includes:

[0023] A position determination module, used to determine whether the pendulum is within a balanced position range according to the digital position signal;

[0024] The stop adjustment module is used to determine a stop control signal when it is determined that the pendulum is within the equilibrium position range.

[0025] Optionally, the zero adjustment device further includes:

[0026] The zeroing limit circuit is arranged on the transmission mechanism. During the zeroing process, when the transmission mechanism contacts the shell of the seismometer, the zeroing limit circuit sends a limit signal to the control unit, so that the control unit sends a control signal for reverse action to the drive unit.

[0027] From the above description, it can be seen that the zeroing device of the deep well seismometer provided in this specification includes a driving unit, a transmission mechanism and a zeroing reed. The power end of the driving unit is connected to one end of the zeroing reed through the transmission mechanism, and the other end of the zeroing reed is connected to the pendulum. When the driving unit is in motion, the zeroing reed is deformed through the transmission mechanism, and the zeroing reed drives the pendulum to move to the zero position. The zeroing device of this embodiment does not need to adjust the overall installation posture of the pendulum body, and can be zeroed within a zeroing range of 5 degrees, thereby realizing the zeroing function of the deep well seismometer. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] In order to more clearly illustrate the embodiments of this specification or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this specification. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0029] Figure 1 A schematic diagram of the device structure of an embodiment of this specification;

[0030] Figure 2 A cross-sectional view of a device according to an embodiment of the present specification;

[0031] Figure 3 A schematic diagram of the three-dimensional structure of the device according to the embodiment of this specification;

[0032] Figure 4 is a structural block diagram of a control unit in an embodiment of this specification;

[0033] Figure 5 This is a simplified schematic diagram of the position of the pendulum body of the embodiment of this specification. DETAILED DESCRIPTION

[0034] In order to make the purpose, technical solutions and advantages of this specification more clear, this specification is further described in detail below in combination with specific embodiments and with reference to the accompanying drawings.

[0035] It should be noted that, unless otherwise defined, the technical terms or scientific terms used in the embodiments of this specification should be understood by people with ordinary skills in the field to which the present disclosure belongs. The "first", "second" and similar words used in the present disclosure do not represent any order, quantity or importance, but are only used to distinguish different components. "Including" or "comprising" and similar words mean that the elements or objects appearing in front of the word cover the elements or objects listed after the word and their equivalents, without excluding other elements or objects. "Connect" or "connected" and similar words are not limited to physical or mechanical connections, but can include electrical connections, whether direct or indirect. "Up", "down", "left", "right" and the like are only used to indicate relative positional relationships. When the absolute position of the described object changes, the relative positional relationship may also change accordingly.

[0036] In some ways, some seismometers can achieve zeroing through manual adjustment. The manual zeroing method is suitable for applications where the installation location is convenient for manual operation and the zeroing range is about 0.1 degrees. Some seismometers can achieve automatic zeroing and have a larger zeroing range (for example, the zeroing range is 2-3 degrees). However, the larger zeroing range is generally achieved by adjusting the overall installation posture of the pendulum body, which is suitable for applications where the installation location space is relatively large and the pendulum body has a larger activity space. However, for deep well seismometers, they are generally installed at 500 meters or less underground. Due to the limitations of installation conditions, the overall volume of deep well seismometers is small, and the activity space underground is very small. It is impossible to achieve zeroing by adjusting the overall installation posture of the pendulum body. In addition, there is a well inclination underground, which requires the deep well seismometer to have a larger zeroing range and an automatic zeroing function.

[0037] In order to solve the above problems, the present specification provides a zeroing device for a deep well seismometer, including a driving unit, a transmission mechanism, and a zeroing reed. When the driving unit is actuated, the zeroing reed is driven to deform through the transmission mechanism, and the zeroing reed drives the pendulum of the pendulum body to move to the zero position to achieve zeroing. There is no need to adjust the overall installation posture of the pendulum body, and the adjustable range is large, so the zeroing of the deep well seismometer can be achieved.

[0038] The present specification is described in detail below with reference to embodiments.

[0039] like Figure 1-3 As shown, the zeroing device of the deep well seismometer provided in this specification is suitable for the deep well seismometer. The deep well seismometer includes an east-west pendulum, a north-south pendulum and a vertical pendulum. The three pendulums are fixedly installed on the base. Any one of the pendulums includes a pendulum bracket 14 and a pendulum 11. The bottom of the pendulum bracket 14 is connected to the pendulum 11 through a cross spring 10. The seismometer senses ground movement through the free movement of the pendulum 11 around the cross spring 10.

[0040] Each pendulum body is provided with a zero adjustment device, which includes a driving unit 2, a transmission mechanism, and a zero adjustment spring 9. The power end of the driving unit 2 is connected to one end of the zero adjustment spring 9 through the transmission mechanism, and the other end of the zero adjustment spring 9 is connected to the pendulum 11.

[0041] The driving unit 2 is activated, and the zero-adjusting spring 9 is deformed through the transmission mechanism, and the zero-adjusting spring 9 drives the pendulum 11 to move to the zero position.

[0042] In this embodiment, a zeroing device is provided on each pendulum body of the deep well seismometer, and the driving unit 2 is connected to the pendulum 11 of the pendulum body through a transmission mechanism and a zeroing spring 9. The driving unit 2 that receives the zeroing instruction moves, drives the transmission mechanism to move, and the movement of the transmission mechanism causes the zeroing spring 9 to deform, and the zeroing spring 9 drives the pendulum 11 to move to the zero position. At this time, the driving unit 2 that receives the stop instruction stops moving, and the pendulum body completes zeroing; the three pendulum bodies of the deep well seismometer are all zeroed through their respective zeroing devices, and the deep well seismometer completes zeroing. The zeroing device of this embodiment drives the pendulum 11 to move to the zero position through the zeroing spring 9, the overall installation posture of the pendulum body remains unchanged, and the position of the pendulum body relative to the seismometer housing does not change. The achievable zeroing range is 5 degrees, and the zeroing range is large, which can be applied to the zeroing of the deep well seismometer.

[0043] As shown in the figure, in this embodiment, the transmission mechanism includes a turbine 3, a worm rod 4, a zeroing screw 15, a zeroing lever 6, a zeroing lever 7, and a zeroing shaft 8. The power end of the driving unit 2 is connected to the zeroing spring 9 through the worm rod 4, the turbine 3, the zeroing screw 15, the zeroing lever 6, the zeroing lever 7, and the zeroing shaft 8. Specifically, the driving unit 2, the turbine 3, the worm rod 4, and the zeroing screw 15 are fixed to the pendulum support 14 through the base 1. The zeroing screw 15 can move left and right along the base 1 under the drive of the turbine 3. One end of the zeroing screw 15 is movably connected to one end of the zeroing lever 6 through the pin 151, and the other end of the zeroing lever 6 is movably connected to one end of the zeroing fork 7. The other end of the zeroing fork 7 is connected to one end of the zeroing shaft 8 through the connecting shaft 71. The other end of the zeroing shaft 8 is connected to one end of the zeroing spring 9. The zeroing lever 6 is connected to the pendulum through the shaft 5. The bracket 14 is connected, and the zeroing lever 6 can rotate around the rotating shaft 5; the driving unit 2 is in motion, the worm gear 4 drives the turbine 3 to rotate, the turbine 3 drives the zeroing screw 15 to move left and right, one end of the zeroing lever 6 moves left and right with the zeroing screw 5 and rotates around the rotating shaft 5, the other end of the zeroing lever 6 drives the zeroing fork 7 to rotate with the connecting shaft 71, the zeroing fork 7 rotates, drives the zeroing rotating shaft 8 to rotate, the zeroing rotating shaft 8 rotates, drives the zeroing spring 9 to deform, the force of the zeroing spring 9 on the pendulum 11 changes, and the pendulum 11 swings around the cross spring 10. Optionally, the driving unit can be a component that can provide driving force, such as a motor.

[0044] In some embodiments, the zeroing spring 9 is a curved spring with elastic force, one end of the zeroing spring 9 is connected to the zeroing shaft 8, and the other end of the zeroing spring 9 is connected to the pendulum 11. When the zeroing shaft 8 rotates, the bending degree of the zeroing spring 9 changes, and the zeroing spring 9 generates a force on the pendulum 11. The pendulum 11 swings with the cross spring 10 as the axis under the force of the zeroing spring 9. When the pendulum 11 swings to the zero position, the zeroing shaft 8 stops rotating, and the pendulum 11 is adjusted to the zero position. By adjusting the position of the pendulum 11 by the zeroing spring 9, a zeroing range of plus or minus 5 degrees (5 degrees tilted in the first direction with the horizontal plane as the reference plane, and 5 degrees tilted in the second direction opposite to the first direction) can be achieved, which can be suitable for deep well applications with a well inclination within a certain degree.

[0045] In some embodiments, the zeroing device of the deep well seismometer further comprises:

[0046] A zero position detection unit, used to detect the position signal of the pendulum;

[0047] The control unit is used to determine a control signal for controlling the action of the driving unit 2 according to the position signal.

[0048] In this embodiment, the zero adjustment device further includes a zero position detection unit and a control unit, wherein the signal output end of the zero position detection unit is connected to the signal input end of the control unit, and the control signal output end of the control unit is connected to the control end of the drive unit 2. When the control unit determines that the pendulum is in a non-zero position state according to the position signal of the zero position detection unit, the control unit sends a zero adjustment instruction to the drive unit 2 to control the drive unit 2 to act, and the drive unit 2 drives the transmission mechanism to act, and the zero adjustment spring 9 is subjected to force to produce elastic deformation, and the zero adjustment spring 9 drives the pendulum 11 to swing around the cross spring 10. During the swinging process of the pendulum 11, when it is determined that the pendulum is in a zero position state according to the position signal of the zero position detection unit, the control unit sends a stop instruction to the drive unit 2 to control the drive unit 2 to stop the action, thereby completing the zero adjustment of the pendulum.

[0049] As shown in the figure, in some embodiments, the pendulum 11 of the pendulum body is provided with a first capacitor moving plate 121 and a second capacitor moving plate 122, and the pendulum body bracket is provided with a capacitor fixed plate 13; the zero position detection unit is a capacitor displacement detection circuit, the capacitor displacement detection circuit detects the capacitance value C1 between the capacitor fixed plate 13 and the first capacitor moving plate 121 and the capacitance value C2 between the capacitor fixed plate 13 and the second capacitor moving plate 122, and the control unit determines whether the pendulum body is in a zero position state according to the position signal detected by the capacitor displacement detection circuit. For example, when the capacitor displacement detection circuit detects that C1≠C2, it is determined that the pendulum body is in a non-zero position state, and the control unit sends a zero adjustment instruction to the drive unit 2; when the capacitor displacement detection circuit detects that C1=C2, it is determined that the pendulum body is in a zero position state, and the control unit sends a stop instruction to the drive unit 2 to complete the zero adjustment. In this way, the zero adjustment device of this embodiment can realize automatic zero adjustment of the pendulum body.

[0050] In this embodiment, the zeroing device of the deep well seismometer can achieve adaptive high-precision zeroing. Figure 4 As shown, the control unit includes:

[0051] An analog-to-digital conversion circuit, used for converting a position signal detected by the zero position detection unit into a digital position signal;

[0052] The processing unit is used to determine a control signal for controlling the action of the driving unit 2 according to the digital position signal.

[0053] In this embodiment, the adaptive zeroing process of the zeroing device is that the zero position detection unit detects the position signal of the pendulum body and transmits the detected position signal to the analog-to-digital conversion unit, the analog-to-digital conversion unit performs analog-to-digital conversion on the position signal, and transmits the converted digital position signal to the processing unit, the processing unit determines whether the pendulum body has reached the equilibrium position according to the received digital position signal, if it has not reached the equilibrium position, the processing unit sends a zeroing control signal to the drive unit 2, the drive unit 2 performs a zeroing action according to the received zeroing control signal; if it has reached the equilibrium position, the processing unit sends a stop control signal to the drive unit 2, the drive unit 2 receives the stop control signal, stops the action, and the seismometer pendulum body completes zeroing and can work normally. The zeroing device of the deep well seismometer of this embodiment can realize the automatic zeroing of the pendulum body, is easy to use, and is suitable for underground use.

[0054] In this embodiment, since the seismometer is a precision instrument, the zeroing accuracy directly affects the detection accuracy of the seismometer. Therefore, this embodiment uses a method of first coarse adjustment and then fine adjustment to accurately zero the pendulum. For the coarse adjustment process, the processing unit includes:

[0055] A position determination module is used to determine whether the pendulum is within the coarse adjustment position range according to the digital position signal;

[0056] The coarse adjustment module is used to determine the coarse adjustment control signal when it is determined that the pendulum is within the coarse adjustment position range.

[0057] like Figure 5 As shown, the pendulum can swing between the first extreme position and the second extreme position. When it is determined that the pendulum is located within the coarse adjustment position range between the first extreme position and the first coarse adjustment position, or is located within the coarse adjustment position range between the second extreme position and the second coarse adjustment position according to the position signal detected by the zero position detection unit, the position of the pendulum is coarsely adjusted, and the processing unit transmits the determined coarse adjustment control signal to the drive unit 2. The drive unit 2 performs a coarse adjustment action according to the coarse adjustment control signal. After the coarse adjustment, the position of the pendulum is adjusted to within the fine adjustment position range.

[0058] For the fine tuning process, the processing unit includes:

[0059] The position judgment module is used to judge whether the pendulum is within the fine adjustment position range according to the digital position signal;

[0060] The fine adjustment module is used to determine the fine adjustment control signal when it is determined that the pendulum is within the fine adjustment position range.

[0061] like Figure 5 As shown, after coarse adjustment, the pendulum is located within the fine adjustment position range between the first coarse adjustment position and the first equilibrium position, or is located within the fine adjustment position range between the second coarse adjustment position and the second equilibrium position. At this time, it is necessary to fine-tune the position of the pendulum, and the processing unit transmits the determined fine-tuning control signal to the drive unit 2. The drive unit 2 performs fine-tuning action according to the fine-tuning control signal. After fine-tuning, the position of the pendulum can be adjusted to within the equilibrium position range.

[0062] In this embodiment, the coarse adjustment position range is larger than the fine adjustment position range, and the coarse adjustment control signal is different from the fine adjustment control signal. Since the seismometer is a precision instrument, the zeroing must be accurate to ensure the detection accuracy of the seismometer. If the same control signal is used to control the action of the leveling drive unit, after the pendulum reaches the fine adjustment position range (an extremely small distance range), it is easy to bypass the equilibrium position and deviate from the equilibrium position. If the equilibrium position is bypassed and the position is reciprocated near the equilibrium position, it is difficult to adjust the pendulum to the equilibrium position, resulting in failure to complete zeroing. This embodiment can ensure accurate zeroing by adopting an adaptive zeroing process of first coarse adjustment and then fine adjustment.

[0063] In the embodiment of the present invention, for the coarse adjustment process, the coarse adjustment module is used to determine the first deviation distance between the current position of the pendulum and the equilibrium position according to the digital position signal, and determine the coarse adjustment control signal according to the first deviation distance. For the fine adjustment process, the fine adjustment module is used to determine the second deviation position between the current position of the pendulum and the equilibrium position according to the digital position signal, and determine the fine adjustment control signal according to the second deviation distance.

[0064] Optionally, the driving unit 2 is a DC motor, and the control signal is a time for controlling the rotation of the DC motor. For the coarse adjustment process, the first time for controlling the rotation of the DC motor in the coarse adjustment control signal is calculated according to the first deviation distance, and the DC motor rotates for the first time according to the coarse adjustment control signal to drive the zero adjustment spring 9 to drive the pendulum to perform the coarse adjustment action; in some implementation methods, the calculation method of the first time t1 is:

[0065] t1=A1×K

[0066] Wherein, A1 is the first deviation distance, K is the zero adjustment coefficient;

[0067] K=B / (S×V)

[0068] Among them, B is the zeroing transmission ratio, which is equal to the distance moved by the zeroing screw 15 when the DC motor rotates for 1 second divided by the distance moved by the fixed plate 13; S is the displacement sensitivity of the capacitor fixed plate 13, which is the voltage value of the displacement change of 1 mm of the capacitor fixed plate 13; V is the moving speed of the zeroing screw 15, which is the distance moved by the zeroing screw 15 when the DC motor rotates for 1 second.

[0069] For the fine adjustment process, the second time for controlling the DC motor to rotate in the fine adjustment control signal is calculated according to the second deviation distance, and the DC motor rotates for the second time according to the fine adjustment control signal to drive the zero adjustment spring 9 to drive the pendulum to perform the fine adjustment action. In some implementations, the calculation method of the first time t2 is:

[0070] t2=A2×K`

[0071] Among them, A2 is the second deviation distance, K` is the correction value of the zero adjustment coefficient K. Since the balance position range is extremely small, the theoretically calculated zero adjustment coefficient K has deviations. In order to ensure the fine-tuning accuracy, the actual test value is obtained through multiple tests. The zero adjustment coefficient K is corrected using the test value to obtain the corrected zero adjustment coefficient K`. In this way, based on the corrected zero adjustment coefficient K`, the fine-tuning accuracy can be improved.

[0072] In this embodiment, after fine adjustment, when it is determined that the pendulum is within the equilibrium position range, the zero adjustment is completed, and the processing unit includes:

[0073] A position determination module is used to determine whether the pendulum is within a balanced position range according to the digital position signal;

[0074] The stop adjustment module is used to determine a stop control signal when it is determined that the pendulum is within the equilibrium position range.

[0075] like Figure 5As shown, ideally, it is hoped that the pendulum body position is adjusted to an absolute equilibrium position. However, due to the influence of multiple factors such as instrument accuracy and ambient temperature, it is often difficult to ensure that the pendulum body position is adjusted to an absolute equilibrium position. In this embodiment, a first equilibrium position and a second equilibrium position are set with a small gap (generally less than 10 nm) from the absolute equilibrium position. When the pendulum body position is adjusted to within the equilibrium position range between the first equilibrium position and the second equilibrium position, it is considered that the pendulum body has reached the equilibrium position and reached the zero position state. At this time, the control drive unit 2 stops the action and completes the zero adjustment.

[0076] In this embodiment, since the deep well seismometer is installed in a deep well and has a small size, the distance between the housing of the seismometer and the pendulum is limited. During the zeroing process, in order to prevent mechanical parts from touching the housing and causing damage to the drive unit or other components, a zeroing limit protection circuit is added, and the signal output end of the zeroing limit protection circuit is connected to the signal input end of the control unit.

[0077] In some embodiments, the zeroing limit circuit is arranged on the transmission mechanism. During the zeroing process, when the transmission mechanism contacts the shell of the seismometer, the zeroing limit circuit sends a limit signal to the control unit, so that the control unit sends a control signal for reverse action to the drive unit 2. Optionally, the zeroing limit protection circuit is arranged at the left and right ends of the zeroing screw 15 along the left and right moving directions. During the zeroing process, when the left end or the right end of the zeroing screw 15 contacts the shell, the zeroing limit protection circuit sends a limit signal to the control unit. The control unit receives the limit signal and sends a control signal for reverse action to the drive unit 2. The drive unit 2 reverses according to the control signal and drives the zeroing screw 15 to move in the reverse direction and away from the shell, thereby avoiding component damage and improving the reliability of the device.

[0078] The zeroing device of the deep well seismometer in the embodiment of the present specification is provided with a zeroing device on each pendulum of the deep well seismometer. When the driving unit is in motion, the pendulum can be driven to move through the transmission mechanism and the zeroing reed 9. The deformation of the zeroing reed 9 causes a change in the force on the pendulum, which can drive the pendulum to move to the zero position. During the zeroing process, the overall installation posture of the pendulum remains unchanged. The achievable zeroing range is 5 degrees, which is relatively large and can be suitable for the zeroing of the deep well seismometer. At the same time, the zeroing device can realize automatic adaptive and high-precision zeroing through the zero position detection unit and the control unit, and ensure the reliability of the device.

[0079] Those skilled in the art should understand that the discussion of any of the above embodiments is merely illustrative and is not intended to imply that the scope of the present disclosure (including the claims) is limited to these examples; within the spirit of this specification, the above embodiments or technical features in different embodiments may be combined, the steps may be implemented in any order, and there are many other variations of different aspects of this specification as described above, which are not provided in detail for the sake of simplicity.

[0080] The embodiments of this specification are intended to cover all such substitutions, modifications and variations that fall within the broad scope of the appended claims. Therefore, any omissions, modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of this specification should be included in the scope of protection of this specification.

Claims

1. A zeroing device for a deep well seismometer, the deep well seismometer comprising a three-way pendulum, each pendulum comprising a pendulum support and a pendulum, the bottom of the pendulum support being connected to the pendulum via a cross spring, characterized in that: The zero adjustment device comprises: a driving unit, a transmission mechanism and a zero adjustment spring, wherein the transmission mechanism comprises a turbine, a worm rod, a zero adjustment screw, a zero adjustment lever, a zero adjustment lever and a zero adjustment shaft, and the zero adjustment spring is a curved spring with elastic force; The power end of the driving unit is connected to one end of the zero adjustment spring through the worm rod, the turbine, the zero adjustment screw, the zero adjustment lever, the zero adjustment lever, and the zero adjustment shaft, and the other end of the zero adjustment spring is connected to the pendulum; The driving unit is actuated to drive the zero adjustment shaft to rotate through the transmission mechanism, and the bending degree of the zero adjustment spring changes, driving the pendulum to swing to the zero position with the cross spring as the axis. The overall installation posture of the pendulum body remains unchanged, and a zero adjustment range of 5 degrees can be achieved.

2. The zero adjustment device according to claim 1, characterized in that: The device also includes: A zero position detection unit, used to detect a position signal of the pendulum; A control unit is used to determine a control signal for controlling the action of the driving unit according to the position signal; the control unit comprises: an analog-to-digital conversion circuit, used for converting the position signal into a digital position signal; The processing unit is used to determine a control signal for controlling the action of the driving unit according to the digital position signal.

3. The zero adjustment device according to claim 2, characterized in that: The processing unit comprises: A position determination module, used to determine whether the pendulum is within a coarse adjustment position range according to the digital position signal; The coarse adjustment module is used to determine a coarse adjustment control signal when it is determined that the pendulum is within the coarse adjustment position range.

4. The zero adjustment device according to claim 3, characterized in that: The coarse adjustment module is used to determine a first deviation distance between the current position of the pendulum and the equilibrium position according to the digital position signal, and determine the coarse adjustment control signal according to the first deviation distance.

5. The zero adjustment device according to claim 2, characterized in that: The processing unit comprises: A position determination module, used to determine whether the pendulum is within a fine adjustment position range according to the digital position signal; The fine adjustment module is used to determine a fine adjustment control signal when it is determined that the pendulum is within the fine adjustment position range.

6. The zero adjustment device according to claim 5, characterized in that: The fine adjustment module is used to determine a second deviation position between the current position of the pendulum and the equilibrium position according to the digital position signal, and determine the fine adjustment control signal according to the second deviation distance.

7. The zero adjustment device according to claim 2, characterized in that: The processing unit comprises: A position determination module, used to determine whether the pendulum is within a balanced position range according to the digital position signal; The stop adjustment module is used to determine a stop control signal when it is determined that the pendulum is within the equilibrium position range.

8. The zero adjustment device according to claim 2, characterized in that: Also includes: The zeroing limit circuit is arranged on the transmission mechanism. During the zeroing process, when the transmission mechanism contacts the shell of the seismometer, the zeroing limit circuit sends a limit signal to the control unit, so that the control unit sends a control signal for reverse action to the drive unit.

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