A centripetal force sensor and method of use thereof

Abstract

The application is a kind of centripetal force sensor and its using method, belonging to the field of sensor. Its technical scheme is a kind of centripetal force sensor, including fixed part and rotating part, rotating part includes sensor shell, sensor shell is hollowly arranged, center signal column is fixedly installed in the inner chamber of sensor shell, the outer circumferential surface of center signal column is provided with a plurality of notches, mass block is placed in the notch, the outer side of mass block is provided with piezoelectric ceramic, piezoelectric ceramic and mass block are clamped between the inner wall of sensor shell and the outer wall of center signal column. The sensor is directly installed in the rotating center of the detection object, the additional centrifugal force generated by the mass of the sensor itself approaches zero, which greatly improves the authenticity of the detection result, at the same time, the sensor is directly in conductive contact with the signal output structure through the center signal column, the mouthpiece does not rotate with the detection object, completely eliminates the winding, pulling and other faults of the mouthpiece and external pipeline, and improves the durability of the sensor.

Description

Technical Field

[0001] This invention relates to the field of sensors, and in particular to a centripetal force sensor and a method of using the centripetal force sensor. Background Technology

[0002] Centripetal force is a real force provided by the shaft system constraints. It cannot be directly measured by a traditional piezoelectric accelerometer. Instead, a traditional piezoelectric accelerometer is needed to indirectly measure radial acceleration to derive centrifugal force, and then obtain centripetal force.

[0003] Traditional sensors need to be installed on non-axial parts of rotating components (such as the side of the rotor or the housing). This installation method will cause various irrelevant interferences to be superimposed on the measurement signal, making it difficult to separate the acceleration corresponding to pure centrifugal force. Specifically, the core objective of centripetal force measurement is to capture the real centripetal force generated by the rotating component itself due to mass distribution and load changes. The different installation positions will directly determine whether to introduce "additional interference forces of the measurement system itself". Conventional piezoelectric accelerometers are usually installed on one side of the rotating arm, that is, "a position away from the center of rotation". When the sensor is installed on the rotating arm, its own mass will generate additional centrifugal force with rotation, resulting in measurement errors.

[0004] Meanwhile, the core application of centripetal force measurement is rotating components, such as motor rotors, turbine blades, centrifuge drums, etc. When traditional cable-connected sensors are installed on rotating components, the cables will become entangled and pulled as the components rotate at high speed. This will not only directly interfere with the dynamic balance of the rotating system, but also cause fatigue breakage of the lead wires due to repeated bending, resulting in measurement interruption. Summary of the Invention

[0005] This invention addresses the problems of traditional piezoelectric accelerometers used for centripetal force detection, such as the sensor being eccentrically positioned on the rotating component, which affects measurement accuracy due to the sensor's own mass, and the sensor cable being prone to fatigue breakage due to repeated bending. It provides a centripetal force sensor that provides accurate detection results and is not easily damaged.

[0006] To solve the above problems, the technical solution adopted by the present invention is a centripetal force sensor, comprising a fixed part and a rotating part. The rotating part includes a sensor housing, which is hollow. A central signal column is fixedly installed in the inner cavity of the sensor housing. The outer circumferential surface of the central signal column has multiple notches, which are evenly arranged along the circumference of the central signal column. A mass block is placed in each notch. In the radial direction of the rotating part, a piezoelectric ceramic is provided on the outer side of the mass block. The piezoelectric ceramic and the mass block are clamped between the inner wall of the sensor housing and the outer wall of the central signal column. Both the mass block and the central signal column are made of conductive materials. A signal output structure is provided at the center of the fixed part, and the central signal column is electrically connected to the signal output structure. This design proposes a sensor capable of directly detecting centripetal force. The sensor is mounted at the center of the object being tested. The fixed part is fixedly connected to the main body of the equipment, while the rotating part is fixedly connected to the object and rotates with it. During rotation, the piezoelectric ceramic exerts a constraint force, i.e., centripetal force, on the mass block. Thus, the sensor is directly mounted at the center of rotation of the object, and the additional centrifugal force generated by the sensor's own mass is close to zero, greatly improving the accuracy of the test results. At the same time, the sensor makes direct conductive contact with the signal output structure through the central signal post, eliminating the need for a cable structure. Furthermore, the connector does not rotate with the object being tested, completely eliminating the possibility of entanglement or pulling between the connector and external pipelines, thus improving the sensor's durability.

[0007] In a preferred embodiment of a centripetal force sensor, the notch is an isosceles triangle with its vertices facing the axis of the central signal column. The mass block is an isosceles triangle adapted to the notch, and the piezoelectric ceramic abuts against the side of the isosceles triangle corresponding to its base. When the sensor rotates, the mass block tends to be thrown radially outward under centrifugal force. The two side walls of the groove constrain and guide the mass block, preventing lateral displacement due to vibration or installation deviation. This ensures that the centrifugal force of the mass block is transmitted radially without lateral force loss, directly acting on the piezoelectric ceramic abutting the bottom or side walls of the groove.

[0008] As a preferred implementation of a centripetal force sensor, in the radial direction of the rotating part, an inner shell plate is provided on the outer side of the piezoelectric ceramic. The inner surface of the inner shell plate is flat and fits against the outer surface of the piezoelectric ceramic, while the outer surface of the inner shell plate is arc-shaped. The side edges of multiple inner shell plates are welded together, and the outer surfaces of the multiple inner shell plates form a continuous cylindrical surface. The outer surface of the inner shell plate fits against the inner wall of the sensor housing, and the maximum thickness of the inner shell plate is less than the side wall thickness of the sensor housing. The sensor adopts a double-shell design of "inner thin shell pre-tightening force constraint + outer thick shell". The thin inner shell of the sensor applies pre-tightening force in a directional manner. The deformation uniformity of the thin shell material is higher, and the transmission loss of pre-tightening force is smaller, which can accurately and uniformly apply the preset pressure to the sensitive elements such as the piezoelectric ceramic. The thick outer shell provides strong protection and structural support. Its rigidity counteracts rotational centrifugal force and radial loads, reducing overall sensor sway and preventing force transmission deviations caused by structural instability, thus further ensuring signal output reliability. Furthermore, the higher rigidity of the thick shell provides comprehensive protection for the sensor core under harsh operating conditions. The combination of thin and thick inner and outer shells resolves the design conflict of requiring both precise pre-tensioning and strong protection in a single shell, achieving functional complementarity.

[0009] As a preferred embodiment of a centripetal force sensor, the sensor housing includes an upper sensor housing and a lower sensor housing. The central signal column, the mass block, and the piezoelectric ceramic are all located between the upper and lower sensor housings. The fixed part is rotatably mounted on the center of the top surface of the upper housing. The split structure facilitates the assembly, inspection, and replacement of core components, reducing production and maintenance costs. The enclosed inner cavity protects the central signal column, piezoelectric ceramic, and other sensitive elements from external moisture and dust corrosion, while ensuring the coaxiality of the core components during rotation and reducing eccentricity errors.

[0010] As a preferred implementation of a centripetal force sensor, a stepped hole is formed at the center of the top surface of the upper housing. The larger diameter section of the stepped hole is located above the smaller diameter section, and the stepped hole is continuous. The fixed part includes a connector housing, and a retaining ring is provided on the outer periphery of the connector housing. The outer diameter of the retaining ring is adapted to the inner diameter of the larger diameter section. The retaining ring and the stepped surface of the stepped hole are in rolling contact via a first ball bearing. The top surface of the sensor upper housing is also provided with a sensor upper pressure ring, which presses against the retaining ring. A connector pin post is provided at the center of the connector housing, and the connector pin post is in conductive contact with the upper end of the central signal post. The rolling contact between the first ball bearing and the stepped surface significantly reduces rotational friction resistance, avoids component wear, extends service life, and ensures smooth rotation of the rotating part. The cooperation between the upper pressure ring and the retaining ring prevents the fixed part from falling off, ensures the relative position stability of the fixed part and the rotating part, and completely eliminates the problem of entanglement and pulling between the connector and external pipelines.

[0011] As a preferred implementation of a centripetal force sensor, the upper end face of the central signal post is provided with a receiving hole, and a second ball bearing is provided in the receiving hole. The lower end of the connector pin post contacts the second ball bearing, which is made of conductive material. Rolling contact replaces direct sliding contact, reducing wear between the central signal post and the connector pin post, and improving the stability and durability of the conductive contact. The conductive ball bearing can adapt to slight installation deviations, ensuring uninterrupted signal transmission and reducing measurement errors caused by poor contact.

[0012] As a preferred implementation of a centripetal force sensor, the bottom surface of the upper housing of the sensor has an upper cavity, and the top surface of the lower housing of the sensor has a lower cavity. The upper cavity and the lower cavity are joined to form the inner cavity of the sensor housing. An upper sintered block is provided in the upper cavity, and a lower sintered block is provided in the lower cavity. The central signal column is sintered and fixed in the upper and lower sintered blocks. The stability of sintering and fixing far exceeds that of traditional bonding or mechanical clamping, which can completely limit the movement of the central signal column and avoid force transmission deviation and signal distortion caused by component displacement. After the molten glass solidifies, it forms an airtight structure that can prevent external moisture, oil, and dust from entering the core area, protect the piezoelectric ceramic and the central signal column, and improve the sensor's adaptability to harsh working conditions.

[0013] As a preferred implementation of a centripetal force sensor, the connector housing includes a pin sintering seat, in which the connector pin is sintered and fixed. Sintering prevents the connector pin from loosening, ensuring stable and continuous conductive contact with the central signal pin and reducing signal transmission loss. The airtight nature of the pin sintering seat protects the conductive area of ​​the connector pin, preventing external impurities from affecting conductivity, and also eliminates the problem of traditional leads breaking due to pulling.

[0014] As a preferred implementation of a centripetal force sensor, the top of the connector pin post is provided with an external thread, and the bottom surface of the sensor's lower housing has a threaded hole at its center. The threaded connection method offers convenient installation, flexible disassembly, and high connection strength, preventing the sensor from loosening in high-speed rotation or vibration environments. It also facilitates precise alignment of the sensor with the rotational center of the object being detected, further reducing the additional centrifugal force generated by the sensor's own mass and improving measurement accuracy. On the other hand, the present invention also provides a method for using the above-mentioned centripetal force sensor, comprising the following steps: S1. Install a sensor on the device under test. In the device under test, the object to be detected is rotated relative to the fixed body. On the fixed body, a signal interface is set at the rotation center position of the object to be detected. The fixed part of the sensor is fixedly installed on the fixed body. The connector pin is connected to the signal interface. The rotating part of the sensor is fixedly installed at the center of the object to be detected. S2. The rotating part rotates with the object being detected, and the mass block tends to move outward radially. The piezoelectric ceramic exerts a constraint force on the mass block, and this constraint force reacts on the piezoelectric ceramic, causing a charge signal representing the centripetal force to be generated in the piezoelectric ceramic. The charge signal is transmitted through the mass block to the central signal post, further transmitted to the connector pin post, and finally acquired by the signal interface.

[0015] As can be seen from the above technical solutions, the advantages of this invention are as follows: The centripetal force sensor of this solution is directly installed at the rotation center of the object being detected, and the additional centrifugal force generated by its own mass is close to zero. Furthermore, the isosceles triangular notch and mass block design avoid lateral force loss, ensuring that the centripetal force is completely converted into the effective pressure of the piezoelectric ceramic, significantly improving detection accuracy and force-to-electricity conversion efficiency. Regarding structural stability, the double-layer shell design with a thin inner shell and a thick outer shell resolves the conflict between precise pre-tightening and strong protection in a single shell. The thin inner shell can uniformly transmit the pre-tightening force, while the thick outer shell offsets the radial load. Simultaneously, the separate shell and the fixed center... The sintered fixing structure of the signal post and connector pin post not only protects the sensitive components from moisture and dust corrosion, but also restricts component movement, reducing signal fluctuations and eccentricity errors. In terms of durability, the leadless design combined with the rolling contact structure of the first and second ball bearings completely eliminates the entanglement and pulling failures between the connector and external pipelines, reduces component wear, avoids the problem of traditional lead wire breakage, and extends service life. In terms of practicality, the threaded connection method is convenient to install and has high connection strength, making it easy to accurately align the rotation center. At the same time, the split structure reduces the assembly and maintenance costs of core components, and the overall design is suitable for long-term stable use in special scenarios such as rotating shaft systems. Attached Figure Description

[0016] To more clearly illustrate the technical solution of this patent, the drawings used in the description will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this patent. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0017] Figure 1 This is a cross-sectional schematic diagram of a specific embodiment of the present invention.

[0018] Figure 2 This is an exploded view of a specific embodiment of the present invention.

[0019] Figure 3 This is a schematic diagram of the cross-section of the detection core in a specific embodiment of the present invention.

[0020] Figure 4 This is a schematic diagram of the fixed part in a specific embodiment of the present invention.

[0021] Figure 5 This is a schematic diagram of the structure of the central signal column in a specific embodiment of the present invention.

[0022] Figure 6 This is a schematic diagram of the upper shell structure in a specific embodiment of the present invention.

[0023] Figure 7 This is a schematic diagram of the assembly fixture in a specific embodiment of the present invention.

[0024] Explanation of main figure symbols 1. Connector housing, 1-1. Snap ring, 1-2. External thread, 2. Connector pin post, 3. Pin sintering seat, 4. Sensor upper pressure ring, 5. Sensor upper housing, 5-1. Stepped hole, 6. First ball bearing, 7. Second ball bearing, 8. Upper sintering block, 9. Center signal post, 9-1. Notch, 9-2. Receiving hole, 10. Sensor lower housing, 10-1. Threaded hole, 11. Inner shell plate, 12. Piezoelectric ceramic, 13. Mass block, 14. Lower sintering block, 15. Retaining ring, 16. Bolt. Detailed Implementation

[0025] To make the objectives, features, and advantages of this patent more apparent and understandable, the technical solutions of this patent will be clearly and completely described below with reference to the accompanying drawings of the specific embodiments. Obviously, the embodiments described below are only some embodiments of this patent, and not all embodiments. Based on the embodiments of this patent, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this patent.

[0026] like Figure 1 , 2As shown, a centripetal force sensor includes a fixed part and a rotating part. The rotating part includes a sensor housing, which includes an upper sensor housing 5 and a lower sensor housing 10. The sensor housing is hollow. The bottom surface of the upper sensor housing 5 has an upper cavity, and the top surface of the lower sensor housing 10 has a lower cavity. The upper cavity and the lower cavity are joined together to form an integral inner cavity of the sensor housing, which can protect the internal sensitive element from external moisture and dust corrosion, while ensuring the coaxiality of the core components during rotation to reduce eccentricity error. A detection core is fixedly installed in the inner cavity of the sensor housing. The detection core includes a central signal post 9. An upper sintered block 8 is provided in the upper cavity, and a lower sintered block 14 is provided in the lower cavity. The central signal post 9 is sintered and fixed in the upper sintered block 8 and the lower sintered block 14. The stability of sintering and fixing is far superior to that of traditional bonding or mechanical clamping. It can completely limit the movement of the central signal post 9 and avoid force transmission deviation and signal distortion caused by component displacement. Moreover, the airtight structure formed after the molten glass solidifies can further protect the piezoelectric ceramic 12 and the central signal post 9, and improve the sensor's adaptability to harsh working conditions. The central signal post 9, the mass block 13, and the piezoelectric ceramic 12 are all located between the upper housing 5 and the lower housing 10 of the sensor.

[0027] In the detection core, such as Figure 5 , 3As shown, the outer circumferential surface of the central signal column 9 is provided with multiple notches 9-1. The multiple notches 9-1 are evenly arranged along the circumference of the central signal column 9. Each notch 9-1 is an isosceles triangle with its vertex facing the axis of the central signal column 9. An isosceles triangular mass block 13 adapted to the notch 9-1 is placed in the notch 9-1. This structure can constrain and guide the mass block 13 when the sensor rotates, avoiding lateral displacement of the mass block 13 due to vibration or installation deviation. It ensures that the centrifugal force of the mass block 13 is transmitted radially and acts directly on the piezoelectric ceramic 12 without lateral force loss, greatly improving the force-to-electric conversion efficiency. In the radial direction of the rotating part, a piezoelectric ceramic 12 is provided on the outer side of the mass block 13. The piezoelectric ceramic 12 is attached to the side corresponding to the base of the isosceles triangle on the mass block 13. The piezoelectric ceramic 12 and the mass block 13 are clamped between the inner wall of the sensor housing and the outer wall of the central signal column 9. In the radial direction of the rotating part, an inner shell plate 11 is also provided on the outer side of the piezoelectric ceramic 12. The inner surface of the inner shell plate 11 is flat and is attached to the outer surface of the piezoelectric ceramic 12. The outer surface of the inner shell plate 11 is arc-shaped. The side edges of multiple inner shell plates 11 are welded together and the outer surfaces form a continuous cylindrical surface. The outer surface of 11 fits against the inner wall of the sensor housing and its maximum thickness is less than the side wall thickness of the sensor housing. This double-layer housing design of "thin inner shell 11 + thick outer sensor housing" solves the design conflict of a single housing requiring both precise pre-tightening and strong protection. The thin inner shell 11 has higher deformation consistency and less transmission loss of pre-tightening force, which can accurately and evenly apply the preset pressure to sensitive elements such as piezoelectric ceramic 12. The thick outer shell can provide strong protection and structural support. Its rigid support can offset the rotational centrifugal force and radial load, reduce the overall shaking of the sensor, avoid force transmission deviation caused by structural instability, and further ensure the reliability of signal output.

[0028] When inspecting the core assembly, the following methods are used: Figure 7 The assembly fixture shown includes a fixing ring 15 and a plurality of bolts 16 evenly arranged on the fixing ring 15. During assembly, the placed test core is placed in the center of the fixing ring, the plurality of bolts 16 are tightened to apply preload, and then the inner shell 11 is welded together.

[0029] Both the mass block 13 and the central signal post 9 are made of conductive material. The fixed part is rotatably mounted at the center of the top surface of the upper housing 5. A signal output structure is provided at the center of the fixed part, and the central signal post 9 is conductively connected to the signal output structure. Signal transmission can be achieved without a cable structure, eliminating the problem of traditional leads breaking due to pulling. Figure 6As shown, a stepped hole 5-1 is provided at the center of the top surface of the upper housing 5. The large diameter section of the stepped hole 5-1 is located above the small diameter section and is provided through it. The fixed part includes a connector housing 1. A retaining ring 1-1 is provided on the outer periphery of the connector housing 1. The outer diameter of the retaining ring 1-1 is adapted to the inner diameter of the large diameter section. The retaining ring 1-1 and the stepped surface of the stepped hole 5-1 are in rolling contact through the first ball 6. The rolling contact between the first ball 6 and the stepped surface can greatly reduce the rotational friction resistance, avoid component wear and extend service life, and at the same time ensure smooth rotation of the rotating part. The top surface of the sensor upper housing 5 is also provided with a sensor upper pressure ring 4 pressing on the retaining ring 1-1. The cooperation between the upper pressure ring 4 and the retaining ring 1-1 can prevent the fixed part from falling off, ensure the relative position stability of the fixed part and the rotating part, and completely eliminate the failure of the connector entanglement and pulling with the external pipeline.

[0030] like Figure 4 As shown, the connector housing 1 has a connector pin post 2 at its center, and a pin sintering seat 3 is provided in the connector housing 1. The connector pin post 2 is sintered and fixed in the pin sintering seat 3. Sintering and fixing can prevent the connector pin post 2 from loosening, ensure its continuous and stable conductive contact with the central signal post 9, reduce signal transmission loss, and the airtight characteristics of the pin sintering seat 3 can protect the conductive area of ​​the connector pin post 2 and prevent external impurities from affecting the conductivity. The connector pin post 2 is in conductive contact with the upper end of the central signal post 9. The upper end face of the central signal post 9 is provided with a receiving hole 9-2. A second ball bearing 7 of conductive material is provided in the receiving hole 9-2. The lower end of the connector pin post 2 contacts the second ball bearing 7. Rolling contact replaces direct sliding contact, which can reduce wear on the central signal post 9 and the connector pin post 2, improve the stability and durability of conductive contact, and the conductive ball bearing can adapt to slight installation deviations to ensure uninterrupted signal transmission and reduce measurement errors caused by poor contact. The top of the connector housing 1 is provided with an external thread 1-2, and the bottom center of the sensor lower housing 10 is provided with a threaded hole 10-1. The threaded connection method is convenient to install, flexible to disassemble, and has high connection strength. It can prevent the sensor from loosening in high-speed rotation or vibration environments. At the same time, it is easy to accurately align the sensor with the rotation center of the object being detected, so that the sensor can be directly installed at the rotation center of the object being detected, making the additional centrifugal force generated by its own mass approach zero, which greatly improves the authenticity of the detection results.

[0031] Example 2 This embodiment further provides a method for using the centripetal force sensor provided in Embodiment 1, namely a centripetal force detection method, including the following steps: S1. Install a sensor on the device under test. In the device under test, the object to be detected is rotated relative to the fixed body. On the fixed body, a signal interface is set at the rotation center position of the object to be detected. Fix the fixed part of the sensor on the fixed body. Connect the connector pin post 2 to the signal interface. Fix the rotating part of the sensor at the center of the object to be detected. S2. The rotating part rotates with the object being detected, and the mass block 13 tends to move outward radially. The piezoelectric ceramic 12 exerts a constraint force on the mass block 13. This constraint force reacts on the piezoelectric ceramic 12, causing a charge signal representing the centripetal force to be generated in the piezoelectric ceramic 12. The charge signal is transmitted through the mass block 13 to the central signal post 9, further transmitted to the connector pin post 2, and finally acquired by the signal interface.

[0032] The above description of the disclosed embodiments enables those skilled in the art to implement or use this patent. 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 other embodiments without departing from the spirit or scope of this patent. Therefore, this patent is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A centripetal force sensor, characterized in that, The device includes a fixed part and a rotating part. The rotating part includes a sensor housing, which is hollow. A central signal column (9) is fixedly installed in the inner cavity of the sensor housing. The outer circumferential surface of the central signal column (9) is provided with multiple notches (9-1). The multiple notches (9-1) are evenly arranged along the circumference of the central signal column (9). A mass block (13) is placed in the notch (9-1). In the radial direction of the rotating part, a piezoelectric ceramic (12) is provided on the outer side of the mass block (13). The piezoelectric ceramic (12) and the mass block (13) are clamped between the inner wall of the sensor housing and the outer wall of the central signal column (9). Both the mass block (13) and the central signal column (9) are made of conductive material. The center of the fixed part is provided with a signal output structure, and the central signal column (9) is conductively connected to the signal output structure. The notch (9-1) is an isosceles triangle, and the vertex of the isosceles triangle faces the axis of the central signal column (9). The mass block (13) is an isosceles triangle that matches the notch (9-1). The piezoelectric ceramic (12) is attached to the side corresponding to the base of the isosceles triangle on the mass block (13). In the radial direction of the rotating part, the piezoelectric ceramic (12) is further provided with an inner shell plate (11) on the outside. The inner side of the inner shell plate (11) is a plane and is attached to the outer side of the piezoelectric ceramic (12). The outer side of the inner shell plate (11) is an arc-shaped surface. The side edges of multiple inner shell plates (11) are welded together. The outer sides of multiple inner shell plates (11) form a continuous cylindrical surface. The outer side of the inner shell plate (11) is attached to the inner wall of the sensor housing. The maximum thickness of the inner shell plate (11) is less than the side wall thickness of the sensor housing. The sensor housing includes an upper sensor housing (5) and a lower sensor housing (10). The central signal column (9), the mass block (13), and the piezoelectric ceramic (12) are all located between the upper sensor housing (5) and the lower sensor housing (10). The fixed part is rotatably installed at the center of the top surface of the upper sensor housing (5). The sensor housing (5) has a stepped hole (5-1) at the center of its top surface. The larger diameter section of the stepped hole (5-1) is located above the smaller diameter section. The stepped hole (5-1) is through the hole. The fixing part includes a connector housing (1). A retaining ring (1-1) is provided on the outer periphery of the connector housing (1). The outer diameter of the retaining ring (1-1) is adapted to the inner diameter of the larger diameter section. The retaining ring (1-1) and the stepped surface of the stepped hole (5-1) are in rolling contact through a first ball (6). The sensor housing (5) also has a sensor upper pressure ring (4) on its top surface. The sensor upper pressure ring (4) is pressed on the retaining ring (1-1). The connector housing (1) has a connector pin post (2) at its center, and the connector pin post (2) is in conductive contact with the upper end of the central signal post (9).

2. The centripetal force sensor according to claim 1, characterized in that, The upper end face of the central signal post (9) is provided with a receiving hole (9-2), and a second ball (7) is provided in the receiving hole (9-2). The lower end of the connector pin post (2) is in contact with the second ball (7), and the second ball (7) is made of conductive material.

3. The centripetal force sensor according to claim 1, characterized in that, The bottom surface of the upper housing (5) of the sensor has an upper cavity, and the top surface of the lower housing (10) of the sensor has a lower cavity. The upper cavity and the lower cavity are connected to form the inner cavity of the sensor housing. The upper cavity has an upper sintering block (8), and the lower cavity has a lower sintering block (14). The central signal column (9) is sintered and fixed in the upper sintering block (8) and the lower sintering block (14).

4. The centripetal force sensor according to claim 1, characterized in that, The connector housing (1) is provided with a pin sintering seat (3), and the connector pin post (2) is sintered and fixed in the pin sintering seat (3).

5. The centripetal force sensor according to claim 1, characterized in that, The top of the connector housing (1) is provided with an external thread (1-2), and the bottom center of the sensor lower housing (10) is provided with a threaded hole (10-1).

6. A method of using a centripetal force sensor as described in any one of claims 1-5, characterized in that, Includes the following steps: S1. Install a sensor on the device under test. In the device under test, the object to be detected is rotated relative to the fixed body. On the fixed body, a signal interface is set at the rotation center position of the object to be detected. The fixed part of the sensor is fixedly installed on the fixed body. The connector pin post (2) is connected to the signal interface. The rotating part of the sensor is fixedly installed at the center of the object to be detected. S2. The rotating part rotates with the object being detected, and the mass block (13) tends to move outward in the radial direction. The piezoelectric ceramic (12) generates a constraint force on the mass block (13), and this constraint force reacts on the piezoelectric ceramic (12), causing a charge signal representing the centripetal force to be generated in the piezoelectric ceramic (12). The charge signal is transmitted through the mass block (13) to the central signal post (9), further transmitted to the connector pin post (2), and finally collected by the signal interface.

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