A ground-insulated acceleration and force composite sensor

Abstract

This invention provides a ground-insulated acceleration and force composite sensor, relating to the field of sensor technology. It includes a housing containing an acceleration module and a force-sensitive module. The housing includes a common base and a sealed outer shell. The common base has an annular inner cavity and a positioning shaft. The force-sensitive module is installed in the annular inner cavity, and the acceleration module is mounted on the positioning shaft. The sealed outer shell surrounds the acceleration module. The force-sensitive module includes an insulating ring A. An insulating sheet A, an electrode sheet A, a force-sensitive element, an electrode sheet A, and an insulating sheet A are stacked sequentially from bottom to top outside the insulating ring A. The acceleration module includes an insulating ring B, which is sleeved outside the positioning shaft. An insulating sheet B, an electrode sheet B, an acceleration-sensitive element, an electrode sheet B, and an insulating sheet B are stacked sequentially along the axial direction outside the insulating ring B. This invention solves the problems of signal crosstalk and low testing accuracy between the acceleration module and the force-sensitive module in the prior art.

Description

Technical Field

[0001] This invention relates to the field of sensor technology, and in particular to a ground-insulated composite acceleration and force sensor. Background Technology

[0002] In fields such as military, aerospace, and industrial monitoring, the mechanical performance testing of complex structures often requires the simultaneous acquisition of acceleration and pressure parameters. As a core testing device, the miniaturization, high precision, and signal synchronization of composite sensors directly determine the quality of test data. As testing scenarios expand to confined spaces and harsh working conditions, higher requirements are placed on the structural integration and anti-interference capabilities of sensors.

[0003] Chinese invention patent CN121007606A discloses a shear-based composite acceleration and pressure sensor, comprising an upper housing, a lower housing, and an acceleration detection module and a pressure detection module disposed between the two housings. The core structure is as follows: the acceleration detection module uses a regular polygonal prism mass block with acceleration-sensitive ceramic plates on its sides; the pressure detection module has a regular polygonal prism force transmission column, with pressure-sensitive ceramic plates, electrode plates, and an insulating block arranged sequentially on its sides. The two modules are coaxially arranged vertically. The working principle is based on the shear effect. Acceleration generates shear force through the inertia of the mass block, acting on the sensitive ceramic plates. Pressure is transmitted through a diaphragm to the force transmission column and converted into shear force. Both types of sensitive ceramic plates convert mechanical quantities into electrical charge signals for output, achieving simultaneous measurement of two parameters.

[0004] However, the existing technology and similar composite sensors still have the following drawbacks: the acceleration module and the pressure (force-sensitive) module are simply isolated by a gap, without a dedicated ground insulation structure, making the signals from the two modules prone to crosstalk; at the same time, there is a lack of targeted insulation protection design between the module and the installation equipment, making it easy for interference signals such as grounding noise, common-mode interference and base thermal strain to intrude, resulting in a decrease in sensor testing accuracy and making it difficult to meet the stringent requirements for high-precision testing in fields such as military and aerospace. Summary of the Invention

[0005] This application provides a ground-insulated acceleration and force composite sensor, which solves the problems in the prior art where the acceleration module and force-sensitive module are simply isolated by a gap without a dedicated ground insulation structure, resulting in signal crosstalk. It also addresses the problems of grounding noise, common-mode interference, and base thermal strain interference signals intruding and reducing test accuracy due to the lack of targeted insulation protection design between the module and the installation equipment.

[0006] To solve the above-mentioned technical problems, the present invention adopts the following technical solution: a ground-insulated acceleration and force composite sensor, comprising a housing, an acceleration module and a force-sensitive module assembled inside the housing, the housing comprising a common base and a sealed outer shell, the common base having an annular inner cavity and a positioning shaft, the force-sensitive module being installed in the annular inner cavity, the acceleration module being assembled on the positioning shaft, and the sealed outer shell enclosing the acceleration module; the force-sensitive module comprising an insulating ring A, an insulating sheet A, a force-sensitive element and an electrode sheet A, the insulating ring A tightly fitted within the annular inner cavity, and the insulating sheet A, electrode sheet A, force-sensitive element, electrode sheet A and insulating sheet A being stacked sequentially from bottom to top outside the insulating ring A; the acceleration module comprising an insulating ring B, an insulating sheet B, an acceleration-sensitive element, electrode sheet B, a force-transmitting plate and a pre-tightening mass block, the insulating ring B being sleeved outside the positioning shaft, and the insulating sheet B, electrode sheet B, acceleration-sensitive element, electrode sheet B and insulating sheet B being stacked sequentially along its own axial direction outside the insulating ring B.

[0007] Because the force-sensitive module of this sensor is tightly fitted into the annular inner cavity of the common base by an insulating ring A, and its exterior is stacked from bottom to top with insulating sheet A, electrode sheet A, force-sensitive element, electrode sheet A, and insulating sheet A, the acceleration module is fitted onto the positioning shaft of the common base by an insulating ring B, and its exterior is stacked along its own axial direction with insulating sheet B, electrode sheet B, acceleration-sensitive element, electrode sheet B, and insulating sheet B, and a sealed outer shell is wrapped around the acceleration module, so that the two modules are respectively assembled in their dedicated installation spaces on the common base and form independent ground-insulating structures. Therefore, when this sensor is in use, the insulating ring A and insulating sheet A can prevent the force-sensitive module from contacting the installation device. The electrical connection of the shared base is blocked by the insulating ring B and the insulating sheet B, which can block the electrical connection between the acceleration module and the installation equipment (shared base). At the same time, the dedicated installation space and the sealed shell can achieve physical isolation between the two modules. Therefore, this sensor can avoid direct interaction between the signals of the two modules during use and block the intrusion of external interference signals into the module. This solves the problems of signal crosstalk caused by the simple isolation between the acceleration module and the force-sensitive module through a gap and the lack of a dedicated ground insulation structure in the existing technology, as well as the problems of grounding noise, common-mode interference and base thermal strain interference signals intrusion and reduced test accuracy caused by the lack of targeted insulation protection design between the module and the installation equipment.

[0008] As a further improvement to the above solution, connectors are provided on both the common base and the sealed shell. The force-sensitive module signal output lead of the force-sensitive module is connected to the corresponding pin of the connector on the common base, and the acceleration module signal output lead of the acceleration module is connected to the corresponding pin of the connector on the sealed shell. This can avoid mutual interference between the force signal and the acceleration signal during transmission, ensure the purity and integrity of the two types of signal transmission, and further enhance the sensor's anti-crosstalk capability.

[0009] As a further improvement to the above solution, a pressure cap is provided at the top of the annular cavity of the sealed shell. The pressure cap is placed on the uppermost insulating sheet A and fixed to the common base. The pressure cap can apply a uniform axial preload to the stacked structure of the force-sensitive module, thereby ensuring that the insulating sheet A, electrode sheet A and force-sensitive element are tightly fitted together, avoiding uneven force transmission due to loose parts, and ensuring the structural stability of the force-sensitive module.

[0010] As a further improvement to the above scheme, the axes of the insulating sheet A, electrode sheet A, and force-sensitive element in the force-sensitive module coincide with the axis of the annular through hole of the common base; the insulating ring B, acceleration-sensitive element, and force-transmitting sheet of the acceleration module are all annular structures, and their axes are all perpendicular to the axis of the annular through hole of the common base; thus, it can be ensured that the force of the force-sensitive module is uniformly transmitted to the force-sensitive element along the axial direction, improving the accuracy of force signal acquisition. At the same time, the acceleration module can acquire shear force along the same reference, realizing independent and synchronous acquisition of the two physical parameters of force and acceleration.

[0011] As a further improvement to the above scheme, adjacent acceleration sensing elements in the acceleration module are installed in opposite phase, and an electrode plate B is sandwiched between adjacent acceleration sensing elements. The signals are combined through the spaced-apart electrode plate B and then output as differential signals to the corresponding pins of the connector. This can effectively suppress common-mode interference, reduce the impact of external interference such as grounding noise on acceleration signal acquisition, significantly improve the detection accuracy of acceleration signals, and ensure the reliability and accuracy of acceleration parameter measurement.

[0012] As a further improvement to the above solution, the force transmission plate of the acceleration module is provided with a positioning groove, and the common base is provided with a corresponding positioning hole. The same positioning rod can be inserted into the positioning groove and the positioning hole. During the assembly of the pre-tightened mass block, the positioning rod can effectively restrict the circumferential rotation of the pre-tightened mass block, ensuring that the acceleration sensitive element only bears the axial pre-tightening force, and avoiding damage to the acceleration sensitive element caused by the additional stress generated by torsion.

[0013] As a further improvement to the above solution, an additional mass block is provided on the outside of the pre-tightening mass block of the acceleration module. The additional mass block and the pre-tightening mass block are detachably assembled, and the additional mass block is attached and fixed to the end of the pre-tightening mass block away from the force transmission plate. The inertial mass of the acceleration module can be flexibly adjusted by replacing the additional mass block with different mass specifications, thereby adjusting the acceleration sensitivity of the sensor as needed, adapting to the differentiated requirements of acceleration measurement range in different test scenarios, and effectively broadening the application scenarios of the sensor.

[0014] As a further improvement to the above solution, the pre-tightened mass block of the acceleration module has a positioning hole at the end away from the force transmission plate and facing the additional mass block, and the positioning hole can be adapted to the positioning post of the pre-tightening clamp; thus, the positioning of the pre-tightened mass block and the application of torque can be achieved through the pre-tightening clamp during assembly.

[0015] As a further improvement to the above solution, both insulating ring A and insulating ring B in the ground insulation structure are made of high-temperature resistant insulating material; thus, it can effectively block the transmission of interference signals such as grounding noise, ensure the ground insulation effect between the two modules and the installed equipment, and withstand the harsh high-temperature conditions in military, aerospace and other fields, ensuring that the sensor can maintain stable insulation performance and structural reliability in extreme environments.

[0016] As a further improvement to the above solution, the force-sensitive element of the force-sensitive module is a ring piezoelectric crystal, and the acceleration-sensitive element of the acceleration module is a shear-type piezoelectric element. The ring piezoelectric crystal can be designed with a larger crystal size under the same external dimensions, which can improve the force monitoring range of the sensor, and the compression structure has higher rigidity and better crystal size utilization. The shear-type piezoelectric element is not easily affected by the thermal strain of the base. Combined with the bias shear structure design, it can effectively improve the frequency response range of the sensor and meet the requirements of high-frequency signal acquisition.

[0017] As can be seen from the above technical solutions, the present invention has at least the following technical effects or advantages: Because the force-sensitive module of this sensor is tightly fitted into the annular inner cavity of the common base by an insulating ring A, and its exterior is stacked from bottom to top with insulating sheet A, electrode sheet A, force-sensitive element, electrode sheet A, and insulating sheet A, the acceleration module is fitted onto the positioning shaft of the common base by an insulating ring B, and its exterior is stacked along its own axial direction with insulating sheet B, electrode sheet B, acceleration-sensitive element, electrode sheet B, and insulating sheet B, and a sealed outer shell is wrapped around the acceleration module, so that the two modules are respectively assembled in their dedicated installation spaces on the common base and form independent ground-insulating structures. Therefore, when this sensor is in use, the insulating ring A and insulating sheet A can prevent the force-sensitive module from contacting the installation device. The electrical connection of the shared base is blocked by the insulating ring B and the insulating sheet B, which can block the electrical connection between the acceleration module and the installation equipment (shared base). At the same time, the dedicated installation space and the sealed shell can achieve physical isolation between the two modules. Therefore, this sensor can avoid direct interaction between the signals of the two modules during use and block the intrusion of external interference signals into the module. This solves the problems of signal crosstalk caused by the simple isolation between the acceleration module and the force-sensitive module through a gap and the lack of a dedicated ground insulation structure in the existing technology, as well as the problems of grounding noise, common-mode interference and base thermal strain interference signals intrusion and reduced test accuracy caused by the lack of targeted insulation protection design between the module and the installation equipment. Attached Figure Description

[0018] To more clearly illustrate the technical solution of the present invention, the accompanying drawings used in the description will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort. Figure 1 This is a schematic diagram of the external structure of the present invention; Figure 2 Full cross-sectional structural diagram of the present invention; Figure 3 This is a schematic diagram of the shared base structure; Figure 4 This is a schematic diagram of the internal structure of the shared base; Figure 5 This is a schematic diagram of the assembly of the speed module and the common base; Figure 6 This is a schematic diagram of the assembly of the speed module and the sealed housing; Figure 7 This is a schematic diagram showing the fit between the pre-tightening mass block and the pre-tightening clamp.

[0019] Explanation of reference numerals in the attached diagram: 1. Connector; 2. Common base; 3. Cover; 4. Electrode A; 5. Insulating sheet A; 6. Insulating ring A; 7. Force-sensitive element; 8. Force-sensitive module signal output lead; 9. Sealed housing; 10. Insulating sheet B; 11. Acceleration-sensitive element; 12. Force transmission plate; 13. Pre-tightening mass block; 14. Additional mass block; 15. Positioning hole; 16. Electrode B; 17. Insulating ring B; 18. Positioning shaft; 19. Acceleration module signal output lead; 20. Positioning rod; 21. Pre-tightening clamp; 121. Positioning groove. Detailed Implementation

[0020] To enable those skilled in the art to better understand the technical solutions of this invention, the technical solutions of the embodiments of this invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this invention, and not all embodiments. Based on the embodiments of this patent, other embodiments obtained by those skilled in the art without creative effort are all within the scope of protection of this patent.

[0021] This invention discloses a ground-insulated acceleration and force composite sensor, such as... Figure 1 , Figure 2As shown, it includes a housing, within which an acceleration module and a force-sensitive module are assembled. The housing includes a common base 2 and a sealed outer shell 9. The common base 2 is integrally formed with an annular inner cavity and a positioning shaft 18. The annular inner cavity provides dedicated installation space for the force-sensitive module, and the positioning shaft 18 serves as the assembly reference for the acceleration module. The sealed outer shell 9 has an annular cover structure, enclosing the acceleration module and providing sealing protection and structural fixation.

[0022] like Figure 2 , Figure 3 As shown, the force-sensitive module includes an insulating ring A6, an insulating sheet A5, a force-sensitive element 7, and an electrode sheet A4. The insulating ring A6 is tightly fitted onto the annular inner wall of the common base 2. The insulating sheet A5, electrode sheet A4, force-sensitive element 7, electrode sheet A4, and insulating sheet A5 are stacked sequentially from bottom to top along the axial direction outside the insulating ring A6, forming a symmetrical stacking structure to ensure the balance of force signal acquisition. The acceleration module includes an insulating ring B17, an insulating sheet B10, an acceleration-sensitive element 11, an electrode sheet B16, a force transmission plate 12, and a pre-tightened mass block 13. The insulating ring B17 is fitted onto the outside of the positioning shaft 18. The insulating sheet B10, electrode sheet B16, acceleration-sensitive element 11, electrode sheet B16, and insulating sheet B10 are stacked sequentially along their own axial direction outside the insulating ring B17. The force transmission plate 12 and the pre-tightened mass block 13 abut against the side of the insulating sheet B10 away from the acceleration-sensitive element 11, forming a complete acceleration detection transmission link.

[0023] Both the side of the common base 2 and the top of the sealed housing 9 are fixedly mounted with connectors 1 by threads. Connectors 1 have multiple sets of independent pins built in, which can be used to achieve independent signal output. One end of the force-sensitive module signal output lead 8 is welded and fixed to the electrode plate A4, and the other end is connected to the corresponding pin of connector 1 on the common base 2. One end of the acceleration module signal output lead 19 is welded and fixed to the electrode plate B16, and the other end is connected to the corresponding pin of connector 1 on the sealed housing 9. The two sets of leads adopt an independent wiring method, which can avoid crosstalk during signal transmission.

[0024] After the sealed outer shell 9 and the common base 2 are assembled, the top of the annular cavity is provided with a pressure cover 3. The pressure cover 3 is an annular plate structure, and its outer diameter is adapted to the top opening size of the annular cavity. The pressure cover 3 is placed on the uppermost insulating sheet A5 and is fixedly connected to the common base 2. The pressure cover 3 can apply a uniform axial preload to the stacked structure of the force-sensitive module, so that the insulating sheet A5, the electrode sheet A4, and the force-sensitive element 7 are in contact, ensuring the structural stability of the force-sensitive module.

[0025] like Figure 4 , Figure 5As shown, in the force-sensitive module, the insulating sheet A5, electrode sheet A4, and force-sensitive element 7 all adopt a ring structure design, and their axes are completely coincident with the axis of the annular through hole of the common base 2, ensuring that the force borne by the force-sensitive element 7 is transmitted along the axial direction, thus improving the accuracy of force detection. The insulating ring B17, acceleration sensing element 11, and force transmission sheet 12 of the acceleration module are also ring structures, and the axes of each component are distributed perpendicularly to the axis of the annular through hole of the common base 2 at 90 degrees. This allows the force-sensitive module to collect amplitude changes along the force axis, and the acceleration module to collect shear force along the same axis, realizing the independent and synchronous acquisition of the two physical parameters.

[0026] In the acceleration module, adjacent acceleration sensing elements 11 are installed in an anti-phase manner, and an electrode plate B16 is sandwiched between two adjacent acceleration sensing elements 11, forming an alternating stacked structure of acceleration sensing elements and electrode plate B. The spaced electrode plates B16 achieve signal merging through internal leads, and finally output differential signals to the corresponding pins of connector 1. The differential signal output method can effectively suppress common-mode interference and significantly improve the detection accuracy of acceleration signals.

[0027] like Figure 5 , Figure 6 As shown, the edge of the force transmission plate 12 of the acceleration module is provided with an arc-shaped positioning groove 121, and a circular positioning hole 15 is opened at the corresponding position of the common base 2. The radius of curvature of the positioning groove 121 is matched with the radius of the positioning hole 15. When the pre-tightening mass block 13 is pre-tightened, the positioning groove 121 and the positioning hole 15 are first adjusted to the coaxial position, and then the cylindrical positioning rod 20 is inserted. The positioning rod 20 can restrict the circumferential rotation of the pre-tightening mass block 13 when it is tightened, ensuring that the acceleration sensitive element 11 is only subjected to axial pre-tightening force, and avoiding damage to the sensitive element caused by the stress generated by torsion.

[0028] The preload mass 13 of the acceleration module has an external thread at the end away from the force transmission plate 12. The center of the additional mass 14 has an internal thread hole that matches the external thread. The additional mass 14 is detachably assembled with the preload mass 13 through a threaded connection. The end face of the additional mass 14 fits against the end face of the preload mass 13. Thus, by replacing the additional mass 14 with different mass specifications, the inertial mass of the acceleration module can be flexibly adjusted, thereby realizing the on-demand adjustment of acceleration sensitivity and broadening the application scenarios of the sensor.

[0029] like Figure 7As shown, the pre-tightening mass block 13 of the acceleration module has multiple evenly distributed positioning holes at the end away from the force transmission plate 12 and facing the additional mass block 14. The number and size of the positioning holes are precisely matched with the positioning posts of the pre-tightening clamp 21. During assembly, the positioning posts of the pre-tightening clamp 21 are inserted into the positioning holes of the pre-tightening mass block 13, and a matching torque is applied using a torque wrench to perform a pre-tightening operation, ensuring that all components fit tightly and effectively improving contact stiffness and signal transmission linearity. It should be understood that the pre-tightening clamp 21 is a special tool for sensor assembly and does not fall within the structural scope of the sensor involved in this invention.

[0030] In addition, the insulating rings A6 and B17 in the ground insulation structure are made of high-temperature resistant insulating materials. Specifically, high-performance insulating materials such as alumina ceramics or silicon nitride ceramics can be selected. These materials not only have excellent electrical insulation properties, effectively blocking ground noise interference and ensuring the ground insulation effect, but also can withstand the harsh high-temperature conditions in military, aerospace and other fields, ensuring that the sensor can maintain stable insulation performance and structural reliability in extreme environments.

[0031] The force-sensitive element 7 of the force-sensitive module adopts a ring piezoelectric crystal. The ring structure allows for a larger crystal size to be designed within the same external dimensions, which helps to improve the force monitoring range of the sensor. In addition, the compression structure has higher rigidity and higher crystal size utilization. The acceleration-sensitive element 11 of the acceleration module is a shear-type piezoelectric element. This type of element is not easily affected by the thermal strain of the base. Combined with the bias shear structure design, it can effectively improve the frequency response range of the sensor, meet the requirements of high-frequency signal acquisition, and adapt to test scenarios under complex working conditions.

[0032] In actual operation, the sensor is rigidly connected to the test object through the annular through-hole of the common base 2. The force-sensitive module directly bears the force along the axial direction. The annular piezoelectric crystal converts the force signal into a charge signal, which is transmitted to the connector 1 on the common base 2 via electrode A4 and the signal output lead 8 of the force-sensitive module. Simultaneously, the shear-type piezoelectric element of the acceleration module generates shear force under inertia, converting the acceleration signal into a charge signal, which is transmitted to the connector 1 on the sealed shell 9 via electrode B16 and the signal output lead 19 of the acceleration module, achieving synchronous acquisition of force and acceleration signals. This invention effectively eliminates grounding noise, common-mode interference, and crosstalk between modules through the insulation design of the insulating ring and insulating sheet; the vertical distribution design of the component axes extends the transmission path of the temperature field to the acceleration core, reducing the influence of thermal strain of the high-temperature base; and the detachable design of the additional mass block enables flexible adjustment of acceleration sensitivity. The overall structure meets the testing requirements of key fields such as military and aerospace for high-precision and complex installation scenarios.

[0033] In the description of this invention, the terms "upper," "lower," "front," "rear," "left," "right," "top," "bottom," "vertical," and "horizontal," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only to describe the invention and not to require the invention to be constructed or operated in a specific orientation; therefore, they should not be construed as limitations on the invention. The terms "connected" and "linked" in this invention should be interpreted broadly. For example, they can refer to a connection or a detachable connection; they can refer to a direct connection or an indirect connection through intermediate components. Those skilled in the art can understand the specific meaning of the above terms based on the specific circumstances.

[0034] The above description of the disclosed embodiments enables those skilled in the art to make or use the invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in its embodiments without departing from the spirit or scope of the invention. Therefore, the invention is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novelty disclosed herein.

Claims

1. A ground-insulated acceleration and force composite sensor, comprising a housing, wherein an acceleration module and a force-sensitive module are assembled within the housing, characterized in that, The housing includes a common base (2) and a sealed outer shell (9). The common base (2) is provided with an annular inner cavity and a positioning shaft (18). The force-sensitive module is installed in the annular inner cavity, and the acceleration module is mounted on the positioning shaft (18). The sealed outer shell (9) is wrapped around the outside of the acceleration module. The force-sensitive module includes an insulating ring A (6), an insulating sheet A (5), a force-sensitive element (7), and an electrode sheet A (4). The insulating ring A (6) is tightly fitted into the annular inner cavity. The insulating sheet A (5), the electrode sheet A (4), the force-sensitive element (7), the electrode sheet A (4), and the insulating sheet A (5) are stacked sequentially from bottom to top outside the insulating ring A (6). The acceleration module includes an insulating ring B (17), an insulating sheet B (10), an acceleration sensing element (11), an electrode sheet B (16), a force transmission sheet (12), and a pre-tightened mass block (13). The insulating ring B (17) is sleeved outside the positioning shaft (18). Outside the insulating ring B (17), the insulating sheet B (10), the electrode sheet B (16), the acceleration sensing element (11), the electrode sheet B (16), and the insulating sheet B (10) are stacked sequentially along their own axial direction.

2. The ground-insulated acceleration and force composite sensor according to claim 1, characterized in that, Both the common base (2) and the sealed shell (9) are provided with connectors (1). The force-sensitive module signal output lead (8) of the force-sensitive module is connected to the corresponding pin of the connector (1) on the common base (2). The acceleration module signal output lead (19) of the acceleration module is connected to the corresponding pin of the connector (1) on the sealed shell (9).

3. The ground-insulated acceleration and force composite sensor according to claim 2, characterized in that, The top of the annular cavity of the sealed housing is provided with a pressure cap (3), which covers the uppermost insulating sheet A (5) and is fixed to the common base (2).

4. The ground-insulated acceleration and force composite sensor according to claim 3, characterized in that, The axes of the insulating sheet A (5), electrode sheet A (4), and force-sensitive element (7) in the force-sensitive module coincide with the axis of the annular through hole of the common base (2); the insulating ring B (17), acceleration-sensitive element (11), and force-transmitting sheet (12) of the acceleration module are all annular structures, and their axes are all perpendicular to the axis of the annular through hole of the common base (2).

5. A ground-insulated acceleration and force composite sensor according to claim 2, characterized in that, The adjacent acceleration sensing elements (11) in the acceleration module are installed in opposite phase, and an electrode plate B (16) is sandwiched between the adjacent acceleration sensing elements (11). The signals are combined through the spaced electrode plate B (16) and the differential signal is output to the corresponding pin of the connector (1).

6. A ground-insulated acceleration and force composite sensor according to claim 5, characterized in that, The force transmission plate (12) of the acceleration module is provided with a positioning groove (121), and the common base (2) is provided with a corresponding positioning hole (15). The same positioning rod (20) can be inserted into the positioning groove (121) and the positioning hole (15).

7. A ground-insulated acceleration and force composite sensor according to claim 1, characterized in that, An additional mass block (14) is provided on the outside of the pre-tightening mass block (13) of the acceleration module. The additional mass block (14) and the pre-tightening mass block (13) are detachably assembled, and the additional mass block (14) is attached and fixed to the end of the pre-tightening mass block (13) away from the force transmission plate (12).

8. A ground-insulated acceleration and force composite sensor according to claim 7, characterized in that, The pre-tightening mass block (13) of the acceleration module has a positioning hole at one end away from the force transmission plate (12) and facing the additional mass block (14), and the positioning hole can be adapted to the positioning post of the pre-tightening clamp (21).

9. A ground-insulated acceleration and force composite sensor according to claim 1, characterized in that, The insulating rings A (6) and B (17) in the ground insulation structure are both made of high-temperature resistant insulating material.

10. A ground-insulated acceleration and force composite sensor according to claim 1, characterized in that, The force-sensitive element (7) of the force-sensitive module is a ring piezoelectric crystal, and the acceleration-sensitive element (11) of the acceleration module is a shear-type piezoelectric element.

Images