Low-noise ultra-wideband seismometer

Abstract

The utility model provides a low noise ultra wide band seismometer, including seismometer casing, magnetic shielding casing, heat preservation cover, trisecting mechanical pendulum and seismometer circuit, magnetic shielding casing and heat preservation cover are both arranged in seismometer casing, heat preservation cover is arranged outside magnetic shielding casing, and the seismometer circuit is arranged in the seismometer casing. The internal space of the seismometer shell is divided into a mechanical pendulum body mounting cavity and a circuit mounting cavity by the magnetic shielding shell, the three-direction mechanical pendulum body is mounted in the mechanical pendulum body mounting cavity, and the seismometer circuit is mounted in the circuit mounting cavity; the three-component mechanical pendulum body comprises three mechanical pendulum bodies, the three mechanical pendulum bodies are evenly distributed in the three-component direction by 120 degrees, each mechanical pendulum body comprises a pendulum body support, a zero setting transmission mechanism and a pendulum bob assembly, and the zero setting transmission mechanism is used for conducting zero setting on the pendulum bob assembly. According to the low-noise ultra-wideband seismometer, the observation frequency band range of the seismometer can be widened, and the self-noise level of the seismometer can be reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of seismographs, in particular to a low-noise ultra-wideband seismograph. Background Art

[0002] The production of wideband seismographs is difficult. The main difficulty lies in the fact that the self-noise at the low-frequency end of the seismograph is difficult to control, thus limiting the frequency band at the low-frequency end. There are many factors affecting the self-noise at the low-frequency end of the seismograph, including but not limited to the structure and various parameter indicators of the pendulum body itself, the mechanical stability and connection firmness of the mechanical pendulum body, the heat preservation and anti-magnetic interference measures for the mechanical pendulum body, etc.

[0003] The low-frequency end frequency band of existing domestic seismographs is difficult to reach 360 seconds. Even if a few seismographs manage to achieve this with difficulty, their self-noise at the low-frequency end still fails to meet the requirements because the factors affecting the self-noise at the low-frequency end of the seismograph cannot be reduced, especially the stability and protection are not good enough. Summary of the Utility Model

[0004] The purpose of the utility model is to provide a low-noise ultra-wideband seismograph, which can broaden the observation frequency band range of the seismograph and reduce the self-noise level of the seismograph.

[0005] The utility model provides a low-noise ultra-wideband seismograph, which includes a seismograph housing, a magnetic shielding housing, a heat preservation cover, a three-component mechanical pendulum body and a seismograph circuit. The magnetic shielding housing and the heat preservation cover are both arranged inside the seismograph housing. The heat preservation cover is arranged outside the magnetic shielding housing. The magnetic shielding housing divides the internal space of the seismograph housing into an independent and enclosed mechanical pendulum installation cavity and a circuit installation cavity. The three-component mechanical pendulum body is installed in the mechanical pendulum installation cavity, and the seismograph circuit is installed in the circuit installation cavity. The three-component mechanical pendulum body includes three mechanical pendulums. The three mechanical pendulums are evenly distributed along the three directions at an angle of 120 degrees horizontally. Each mechanical pendulum includes a pendulum body support, a zero-adjusting transmission mechanism and a pendulum weight assembly respectively arranged on the pendulum body support. The zero-adjusting transmission mechanism is used to adjust the zero of the pendulum weight assembly.

[0006] According to the low-noise ultra-wideband seismograph provided by the utility model, the seismograph housing includes a base and a housing body, and the housing body is detachably connected to the base;

[0007] The magnetic shielding housing includes a magnetic shielding chassis and a magnetic shielding cover. The magnetic shielding cover is detachably connected to the magnetic shielding chassis. The magnetic shielding chassis is installed on the base, and the heat preservation cover is installed on the outer side surface of the magnetic shielding cover.

[0008] According to a low-noise ultra-wideband seismometer provided by the present utility model, the seismometer circuit is installed on the upper part of the heat preservation cover.

[0009] According to a low-noise ultra-wideband seismometer provided by the present utility model, three evenly distributed anchor bolts are installed at the bottom of the base.

[0010] According to a low-noise ultra-wideband seismometer provided by the present utility model, the pendulum body support is inclined at 54.7 degrees, and the pendulum weight assembly is inclined and suspended on the pendulum body support.

[0011] According to a low-noise ultra-wideband seismometer provided by the present utility model, the zero-adjusting transmission mechanism includes a zero-adjusting motor. A driving shaft of the zero-adjusting motor is fixedly installed with a driving gear, the driving gear is meshed and connected with a driven gear, the driven gear is fixedly connected with a gear shaft, a zero-adjusting shaft is sleeved outside the gear shaft, a quartz ball is bonded to the lower end of the zero-adjusting shaft, the quartz ball is tightly connected with a quartz plate, the quartz plate is adhesively bonded to one side of a zero-adjusting plate, the other side of the zero-adjusting plate is connected with the pendulum body support through a spring piece, one end of a back spring is connected with the zero-adjusting plate, and the other end of the back spring is connected with the pendulum weight assembly.

[0012] According to a low-noise ultra-wideband seismometer provided by the present utility model, the pendulum weight assembly includes a pendulum weight and two moving electrode plates, and each moving electrode plate is fixedly connected with the pendulum weight.

[0013] According to a low-noise ultra-wideband seismometer provided by the present utility model, the pendulum weight is installed on the pendulum body support through a cross spring, the pendulum weight can rotate around the cross spring, and the pendulum weight is fixedly connected with the other end of the back spring.

[0014] According to a low-noise ultra-wideband seismometer provided by the present utility model, a displacement transducer for detecting the position of a fixed electrode plate is arranged on the moving electrode plate, a zero-position detection circuit board for detecting the zero-position signal of the pendulum weight assembly is installed on the pendulum body support, and the displacement transducer is electrically connected with the zero-position detection circuit board; two limiting columns for limiting the moving range of the zero-adjusting plate are installed on the pendulum body support, a contact sensor is installed on each limiting column, and the contact sensor is electrically connected with a limiting circuit board; a motor drive circuit board is further installed on the pendulum body support, and the motor drive circuit board is electrically connected with the zero-adjusting motor.

[0015] According to a low-noise ultra-wideband seismometer provided by the present utility model, it further includes a ground monitoring device, and the ground monitoring device is provided with a central processor, and the central processor is electrically connected with the limiting circuit board, the zero-position detection circuit board and the motor drive circuit board respectively.

[0016] The low-noise ultra-wideband seismometer provided by the present utility model divides the inner space of the seismometer housing into an independent and enclosed mechanical pendulum body installation cavity and a circuit installation cavity through the magnetic shielding housing and the thermal insulation cover, both of which are arranged inside the seismometer housing, and the thermal insulation cover is arranged outside the magnetic shielding housing. The three-component mechanical pendulum is installed in the mechanical pendulum body installation cavity, and the seismometer circuit is installed in the circuit installation cavity, so that the seismometer circuit can be isolated from the three-component mechanical pendulum, not only suppressing the influence of the magnetic field in the surrounding environment on the three-component mechanical pendulum, but also greatly reducing the electromagnetic interference of the seismometer circuit from affecting the three-component mechanical pendulum. By arranging the thermal insulation cover outside the magnetic shielding housing, it can play a good heat preservation role and reduce the influence of the change in the surrounding environmental temperature on the seismometer mechanical pendulum. By arranging the three mechanical pendulums evenly at 120 degrees horizontally in three directions, it can better ensure the spatial orthogonality of the three-component mechanical pendulum. Each mechanical pendulum includes a pendulum body support, a zero-adjustment transmission mechanism and a pendulum weight assembly respectively arranged on the pendulum body support. The zero-adjustment transmission mechanism is used to zero-adjust the pendulum weight assembly, thus ensuring the stability of the mechanical zero point of the seismometer. Therefore, the low-noise ultra-wideband seismometer provided by the present utility model reduces the self-noise level of the seismometer and broadens the observation frequency band range of the seismometer by effectively reducing the influence of temperature difference and magnetic interference on the stability of the seismometer. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the specific embodiments of the present utility model or the technical solutions in the prior art, the following will briefly introduce the drawings required for use in the description of the specific embodiments or the prior art. Obviously, the following drawings are some embodiments of the present utility model. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0018] Figure 1 Isometric view of the low-noise ultra-wideband seismometer of the present utility model;

[0019] Figure 2 Front view of the low-noise ultra-wideband seismometer of the present utility model;

[0020] Figure 3 For Figure 2 A-A sectional view;

[0021] Figure 4 Schematic diagram of the arrangement of the three-component mechanical pendulum in the low-noise ultra-wideband seismometer of the present utility model;

[0022] Figure 5 Isometric view of a single mechanical pendulum in the low-noise ultra-wideband seismometer of the present utility model;

[0023] Figure 6This is the front view of a single mechanical pendulum body in the low-noise ultra-wideband seismometer of the present utility model;

[0024] Figure 7 It is Figure 6 the sectional view taken along the line B-B of

[0025] Explanation of reference numerals:

[0026] 1. Seismometer housing; 101. Base; 102. Housing body;

[0027] 2. Magnetic shielding housing; 201. Magnetic shielding chassis; 202. Magnetic shielding cover;

[0028] 3. Thermal insulation cover; 301. Cylindrical thermal insulation shell; 302. Circular thermal insulation top;

[0029] 4. Installation cavity for the seismometer mechanical pendulum body;

[0030] 5. Circuit installation cavity;

[0031] 6. Three-component mechanical pendulum body; 600. Mechanical pendulum body; 601. Pendulum body support; 602. Zero-adjusting motor; 603. Driving gear; 604. Driven gear; 605. Gear shaft; 606. Zero-adjusting shaft; 607. Quartz ball; 608. Quartz plate; 609. Zero-adjusting plate; 610. Back spring; 611. Pendulum bob; 612. Moving electrode plate; 613. Fixed electrode plate; 614. Cross spring; 615. Limit post; 616. Limit circuit board;

[0032] 7. Seismometer circuit;

[0033] 8. Anchor foot;

[0034] 9. Installation chassis. Specific embodiments

[0035] Next, the technical solutions of the present utility model will be clearly and completely described in conjunction with the embodiments. Obviously, the described embodiments are part of the embodiments of the present utility model, rather than all of the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present utility model without making creative efforts shall fall within the protection scope of the present utility model.

[0036] In the description of the present utility model, it should be understood that the orientation or positional relationship indicated by the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation to the present utility model.

[0037] In addition, the terms "first" and "second" are only used for descriptive purposes and should not be construed as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include one or more of the said features. In the description of the present utility model, "a plurality of" means two or more unless otherwise specifically defined. In addition, the terms "mounted", "connected" and "coupled" should be understood in a broad sense. For example, it may be a fixed connection, a detachable connection or an integral connection; it may be a mechanical connection or an electrical connection; it may be directly connected or indirectly connected through an intermediate medium, and it may be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances.

[0038] As Figures 1 to 7 shown, the low-noise ultra-wideband seismometer of the embodiment of the present utility model includes a seismometer housing 1, a magnetic shielding housing 2, a thermal insulation cover 3, a three-component mechanical pendulum 6 and a seismometer circuit 7.

[0039] Among them, the magnetic shielding housing 2 and the thermal insulation cover 3 are both arranged inside the seismometer housing 1, the thermal insulation cover 3 is arranged outside the magnetic shielding housing 2, and the magnetic shielding housing 2 divides the internal space of the seismometer housing 1 into an independent and enclosed mechanical pendulum installation cavity 4 and a circuit installation cavity 5. The three-component mechanical pendulum 6 is installed in the mechanical pendulum installation cavity 4, and the seismometer circuit 7 is installed in the circuit installation cavity 5, which not only suppresses the influence of the magnetic field of the surrounding environment on the three-component mechanical pendulum 6, but also greatly reduces the electromagnetic interference of the seismometer circuit 7 from affecting the three-component mechanical pendulum 6. By arranging the thermal insulation cover 3 outside the magnetic shielding housing 2, a good heat preservation effect can be achieved, and the influence of the change of the surrounding environment temperature on the seismometer mechanical pendulum is reduced.

[0040] Among them, the three-component mechanical pendulum body 6 includes three mechanical pendulum bodies 600, which are evenly distributed at 120 degrees horizontally along the three components, and can better ensure the spatial orthogonality of the three-component mechanical pendulum body 6. Each mechanical pendulum body 600 includes a pendulum body bracket 601, a zero-adjusting transmission mechanism and a pendulum bob assembly respectively arranged on the pendulum body bracket 601. The zero-adjusting transmission mechanism is used to zero-adjust the pendulum bob assembly, thus ensuring the stability of the mechanical zero point of the seismometer.

[0041] Thus, the low-noise ultra-wideband seismometer according to the embodiment of the present invention effectively reduces the influence of temperature difference and magnetic interference on the stability of the seismometer, thereby reducing the self-noise level of the seismometer and broadening the observation frequency band range of the seismometer.

[0042] Specifically, the seismometer housing 1 includes a base 101 and a housing body 102. The housing body 102 is detachably connected to the base 101, which is convenient for installing the internal structure of the seismometer housing 1. Among them, the shape of the seismometer housing 1 can be set according to actual use requirements.

[0043] In this embodiment, the cross-section of the base 101 is circular, that is, the base 101 adopts a circular structure base. An installation bottom cavity with an upward opening is provided in the base 101, which is convenient for installing the magnetic shielding housing 2.

[0044] In this embodiment, the housing body 102 includes a cylindrical housing side wall and a circular arched housing top. The circular arched housing top is arranged at the upper end of the cylindrical housing side wall, and the circular arched housing top and the cylindrical housing side wall are of an integrally formed structure.

[0045] Among them, the lower end of the cylindrical housing side wall is detachably connected to the base 101. According to actual use requirements, the base 101 and the housing body 102 can be detachably connected by connectors or buckles. Of course, other forms of detachable connection methods can also be used.

[0046] Specifically, the magnetic shielding housing 2 includes a magnetic shielding chassis 201 and a magnetic shielding cover 202. The magnetic shielding cover 202 is detachably connected to the magnetic shielding chassis 201, so that a closed installation cavity 4 for the seismometer mechanical pendulum can be formed between the magnetic shielding cover 202 and the magnetic shielding chassis 201. Through the detachable connection method between the magnetic shielding cover 202 and the magnetic shielding chassis 201, it is convenient to install the seismometer mechanical pendulum into the installation cavity 4 for the seismometer mechanical pendulum.

[0047] Among them, the shape of the magnetic shielding housing 2 can be set according to actual usage requirements. In this embodiment, the magnetic shielding chassis 201 is set as a circular disk, and the magnetic shielding chassis 201 is installed in the installation bottom cavity of the base 101. The magnetic shielding cover 202 includes a cylindrical magnetic shielding cover wall and a circular magnetic shielding cover top. The circular magnetic shielding cover top is arranged at the upper end of the cylindrical magnetic shielding cover wall, and the circular magnetic shielding cover top and the cylindrical magnetic shielding cover wall are of an integrally formed structure.

[0048] Among them, the lower end of the cylindrical magnetic shielding cover wall is detachably connected to the magnetic shielding chassis 201. According to actual usage requirements, between the magnetic shielding chassis 201 and the magnetic shielding cover 202, a connecting piece or a buckle can be used for detachable connection. Of course, other forms of detachable connection methods can also be adopted.

[0049] Among them, three mechanical pendulum bodies 600 are installed on the magnetic shielding chassis 201 through the installation chassis 9.

[0050] Specifically, the heat preservation cover 3 includes a cylindrical heat preservation shell 301 and a circular heat preservation top 302. The circular heat preservation top 302 is arranged at the upper end of the cylindrical heat preservation shell 301, and the circular heat preservation top 302 and the cylindrical heat preservation shell 301 are of an integrally formed structure. Among them, the cylindrical heat preservation shell 301 is installed on the outer side surface of the cylindrical magnetic shielding cover wall, and the circular heat preservation top 302 is installed on the outer side surface of the circular magnetic shielding cover top, so as to form effective heat preservation protection on the outer side of the magnetic shielding housing 2.

[0051] Among them, in order to ensure that the heat preservation cover 3 has a good heat preservation effect, the thickness of the heat preservation cover 3 can be set according to the actual usage scenario.

[0052] Among them, the seismometer circuit 7 is installed on the upper part of the circular heat preservation top of the heat preservation cover 3, which is convenient for installation and layout.

[0053] Specifically, three evenly distributed anchor bolts 8 are installed at the bottom of the base 101 to further ensure the overall structural stability of the base 101. By using the solid base 101 and the anchor bolts 8, the seismometer can be installed more stably.

[0054] Among them, the outer housing 102 adopts a thickened structure, which can also increase the overall stability of the seismometer and has better heat preservation performance.

[0055] Specifically, the pendulum support 601 is inclined at an angle of 54.7 degrees, and the pendulum assembly is inclined and suspended on the pendulum support 601, so as to better ensure the spatial orthogonality of the three-component mechanical pendulum 6.

[0056] Specifically, the zero-adjusting drive mechanism includes a zero-adjusting motor 602. A driving gear 603 is fixedly installed on the driving shaft of the zero-adjusting motor 602. The driving gear 603 is meshed and connected with a driven gear 604. The driven gear 604 is fixedly connected with a gear shaft 605. A zero-adjusting shaft 606 is sleeved outside the gear shaft 605. A quartz ball 607 is bonded to the lower end of the zero-adjusting shaft 606. The quartz ball 607 is pressed and connected with a quartz plate 608. The quartz plate 608 is adhesively bonded to one side of a zero-adjusting plate 609. The other side of the zero-adjusting plate 609 is connected to a pendulum support 601 through a spring piece, and the zero-adjusting plate 609 is fixedly connected to one end of a back spring 610. The other end of the back spring 610 is connected to a pendulum assembly.

[0057] During operation, the rotation of the zero-adjusting motor 602 can drive the driving gear 603 to rotate. The driving gear 603 drives the driven gear 604 to rotate. The driven gear 604 drives the gear shaft 605 to rotate. The gear shaft 605 can drive the zero-adjusting shaft 606 to rotate and move up and down, so as to press the quartz plate 608 through the quartz ball 607 on the zero-adjusting shaft 606. The quartz plate 608 then drives the zero-adjusting plate 609 to move, and changes the bending degree of the back spring 610 through the movement of the zero-adjusting plate 609, so as to drive the pendulum assembly to perform zero adjustment through the back spring 610.

[0058] Among them, the movement of the zero-adjusting plate 609 is based on the lever principle. Since the zero-adjusting shaft 606 always bears the upward pressure from the zero-adjusting plate 609, it avoids the gap that may occur during positive and negative adjustment in the process of adjusting the bending degree of the back spring by adjusting the back spring mounting shaft in the prior art, greatly increasing the zero-adjusting accuracy and avoiding the problem of back-and-forth adjustment.

[0059] Since the quartz ball 607 and the quartz plate 608 are used for pressure conduction, the smoothness of the quartz material prevents stress accumulation caused by incomplete sliding, and because of the high hardness of the quartz, it avoids the slight deformation that may occur under long-term pressure of ordinary metals, ensuring the stability of the zero point.

[0060] Therefore, after the seismometer is installed, the rapid zero adjustment of the seismometer can be realized by controlling the operation of the zero-adjusting motor 602. It is not only convenient for adjustment operation, but also has high adjustment accuracy, thus ensuring the stability of the mechanical zero point of the seismometer.

[0061] Specifically, the total mass of the pendulum assembly reaches 400 g, the natural vibration period exceeds 1.5 s, and the number of free oscillation cycles exceeds 20 cycles, which can theoretically lay a good foundation for the low noise of this seismometer.

[0062] Specifically, the pendulum assembly includes a pendulum 611 and two moving plates 612. Each moving plate 612 is fixedly connected to the pendulum 611, and the pendulum 611 is fixedly connected to the other end of the back spring 610. The pendulum 611 is installed on the pendulum body bracket 601 through a cross spring 614, and the pendulum 611 can slightly rotate around the cross spring 614.

[0063] Among them, a fixed plate 613 is also provided between the two moving plates 612. The two sides of the fixed plate 613 are respectively fixedly connected to the pendulum body bracket 601. When the back spring 610 drives the pendulum 611 to rotate around the cross spring 614 under the action of the zero-adjusting plate 609, it can drive the positions of the two moving plates 612 fixed on the pendulum 611 to be toggled, so as to adjust the fixed plate 613 to be exactly in the middle position between the two moving plates 612, thereby realizing zero adjustment. That is to say, the purpose of zero adjustment is to adjust the two moving plates 612 to have the same gap from the fixed plate 613, so that after zero adjustment, the fixed plate 613 is located exactly in the middle of the two moving plates 612 and they do not contact each other.

[0064] Specifically, the zero-adjusting motor 602 is installed on the zero-adjusting motor bracket, and the zero-adjusting motor bracket is installed on the pendulum body bracket 601. The zero-adjusting motor bracket is provided with a threaded hole adapted to the zero-adjusting shaft 606. The gear shaft 605 and the zero-adjusting shaft 606 are connected by a pin shaft, and the pin shaft is fixedly connected to the gear shaft 605. That is to say, the rotation of the gear shaft 605 can drive the zero-adjusting shaft 606 to rotate. The zero-adjusting shaft 606 is threadedly connected to the zero-adjusting motor bracket, so that the zero-adjusting shaft 606 and the zero-adjusting motor bracket form a lead screw-nut structure. When the zero-adjusting shaft 606 rotates, it will move up and down along the threaded hole of the zero-adjusting motor bracket, so as to realize the up and down movement of the zero-adjusting shaft 606 while rotating. A limiting groove extending axially is also provided on the zero-adjusting shaft 606, and the pin shaft and the limiting groove are slidably matched up and down to play a limiting role, so that the zero-adjusting shaft 606 can move up and down along the gear shaft 605 while rotating with the gear shaft 605.

[0065] Specifically, a displacement transducer for detecting the position of the fixed plate 613 is provided on the moving plate 612. The displacement transducer can convert the position information of the fixed plate 613 into an electrical signal. Among them, a zero-position detection circuit board for detecting the zero-position signal of the pendulum assembly is also installed on the pendulum body bracket 601. The zero-position detection circuit board is electrically connected to the displacement transducer, so as to collect the mechanical pendulum zero-position signal after transformation in real time and upload it to the ground monitoring device.

[0066] Specifically, two limit posts 615 for restricting the movement range of the zero-adjustment plate 609 are installed on the pendulum body support 601, and contact sensors are respectively installed on each limit post 615. A limit circuit board 616 is also installed on the pendulum body support 601, and the limit circuit board 616 is electrically connected to the contact sensors. When the zero-adjustment plate 609 contacts one of the limit posts 615, the corresponding contact sensor is triggered. At this time, the zero-adjustment motor 602 is controlled to rotate in the reverse direction, so that the zero-adjustment plate 609 is separated from the limit post 615, the zero adjustment is ended, and the limit information is uploaded to the ground monitoring device.

[0067] Specifically, a motor drive circuit board is also installed on the pendulum body support 601, and the motor drive circuit board is electrically connected to the zero-adjustment motor 602. The motor drive circuit is used to amplify the driving ability of the control signal and effectively drive the normal operation of the zero-adjustment motor 602.

[0068] Specifically, the ground monitoring device is provided with a central processor, and the central processor is electrically connected to the limit circuit board, the zero position detection circuit board, and the motor drive circuit board respectively, so as to realize the remote zero adjustment of the seismometer zero adjustment device.

[0069] Among them, the control principle of the central processor is as follows:

[0070] After the seismometer is powered on, wait for 20 s. After the system is stable, the central processor controls the seismometer to switch from the long-period working mode to the short-period zero-adjustment mode, so that the zero position information can respond in real time with the change of the pendulum position. The central processor first detects the locked pendulum state of the seismometer. If it is in the locked pendulum state, the unlocking pendulum action is first performed. Then, the central processor performs corresponding processing according to the collected zero position information of the seismometer, and controls the rotation time and direction of each zero-adjustment motor of the three-component mechanical pendulum body. While the zero-adjustment motor is rotating, the central processor monitors the zero position information in real time. When the zero position information of the three-component mechanical pendulum body is within the zero position threshold range, the central processor controls the seismometer to switch to the long-period normal working mode, and the zero adjustment ends, so as to achieve the purpose of fast and accurate zero adjustment.

[0071] Thus, after the seismometer is installed, it can automatically complete the zero adjustment when powered on, or remotely adjust the zero point through the ground monitoring device. The zero point can be adjusted to within plus or minus 0.5 volts through the zero adjustment transmission mechanism. When the seismometer is installed too obliquely and the zero adjustment cannot be completed, the limit structure composed of the limit circuit board 616 and the limit post 615 can be used to avoid mechanical damage caused by over-adjustment.

[0072] It should be noted that in this embodiment, the control principle and method of the central processor belong to the control principle and method of the prior art, so there is no improvement to the method involved.

[0073] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that they can still modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements on some or all of the technical features; and these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A low-noise ultra-wideband seismometer, characterized in that, It includes a seismometer housing, a magnetic shielding housing, a thermal insulation cover, a three-component mechanical pendulum body, and a seismometer circuit. The magnetic shielding housing and the thermal insulation cover are both arranged inside the seismometer housing. The thermal insulation cover is arranged outside the magnetic shielding housing. The magnetic shielding housing divides the internal space of the seismometer housing into an independent and enclosed mechanical pendulum body installation cavity and a circuit installation cavity. The three-component mechanical pendulum body is installed in the mechanical pendulum body installation cavity, and the seismometer circuit is installed in the circuit installation cavity. The three-component mechanical pendulum body includes three mechanical pendulum bodies, and the three mechanical pendulum bodies are evenly distributed at 120 degrees horizontally in three directions. Each mechanical pendulum body includes a pendulum body bracket, a zero-adjustment drive mechanism, and a pendulum bob assembly respectively arranged on the pendulum body bracket. The zero-adjustment drive mechanism is used to zero-adjust the pendulum bob assembly.

2. The low-noise ultra-wideband seismometer according to claim 1, characterized in that, The seismometer housing includes a base and a housing body, and the housing body is detachably connected to the base. The magnetic shielding housing includes a magnetic shielding chassis and a magnetic shielding cover. The magnetic shielding cover is detachably connected to the magnetic shielding chassis. The magnetic shielding chassis is installed on the base, and the thermal insulation cover is installed on the outer side surface of the magnetic shielding cover.

3. The low-noise ultra-wideband seismometer according to claim 2, characterized in that, The seismometer circuit is installed on the upper part of the thermal insulation cover.

4. The low-noise ultra-wideband seismometer according to claim 2, characterized in that, Three evenly distributed anchor feet are installed at the bottom of the base.

5. The low-noise ultra-wideband seismometer according to claim 1, characterized in that, The pendulum body bracket is inclined at 54.7 degrees, and the pendulum bob assembly is inclined and suspended on the pendulum body bracket.

6. The low-noise ultra-wideband seismometer according to claim 1, characterized in that, The zero-adjustment drive mechanism includes a zero-adjustment motor. A driving gear is fixedly installed on the driving shaft of the zero-adjustment motor. The driving gear is meshed and connected with a driven gear. The driven gear is fixedly connected with a gear shaft. A zero-adjustment shaft is sleeved outside the gear shaft. A quartz ball is bonded to the lower end of the zero-adjustment shaft. The quartz ball is pressed and connected with a quartz plate. The quartz plate is bonded to one side of a zero-adjustment plate. The other side of the zero-adjustment plate is connected to the pendulum body bracket through a spring piece. One end of a back spring is connected to the zero-adjustment plate, and the other end of the back spring is connected to the pendulum bob assembly.

7. The low-noise ultra-wideband seismometer according to claim 6, characterized in that, The pendulum bob assembly includes a pendulum bob and two moving electrode plates, and each moving electrode plate is fixedly connected to the pendulum bob.

8. The low-noise ultra-wideband seismometer according to claim 7, characterized in that, The pendulum bob is installed on the pendulum body bracket through a cross spring. The pendulum bob can rotate around the cross spring, and the pendulum bob is fixedly connected to the other end of the back spring.

9. The low-noise ultra-wideband seismometer according to claim 7, characterized in that, A displacement transducer for detecting the position of a fixed electrode plate is arranged on the moving electrode plate. A zero-position detection circuit board for detecting the zero-position signal of the pendulum bob assembly is installed on the pendulum body bracket. The displacement transducer is electrically connected to the zero-position detection circuit board. Two limit posts for restricting the movement range of the zero-adjustment plate are installed on the pendulum body bracket. A contact sensor is installed on each limit post, and the contact sensor is electrically connected to a limit circuit board. A motor drive circuit board is also installed on the pendulum body bracket, and the motor drive circuit board is electrically connected to the zero-adjustment motor.

10. The low-noise ultra-wideband seismometer according to claim 9, characterized in that It further includes a ground monitoring device. The ground monitoring device is provided with a central processor, and the central processor is electrically connected to the limit circuit board, the zero-position detection circuit board, and the motor drive circuit board respectively.

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