Orientation Testing Device and Testing Method for Hemispherical Gyro Sensitive Head

Abstract

The present invention discloses an orientation testing device for a hemispherical gyroscope sensitive head, which includes a housing. Upper and lower openings are respectively provided at the upper and lower ends of the housing. A guiding sliding sleeve fixed to the housing is vertically arranged inside the housing. A guiding sliding shaft is inserted into the guiding sliding sleeve. An adjusting thread is provided on the guiding sliding shaft. A stroke adjusting nut is sleeved on the shaft body of the guiding sliding shaft above the guiding sliding sleeve. A limiting pressing plate is arranged above the stroke adjusting nut. The upper end of the guiding sliding shaft passes through the limiting pressing plate, and one end of the limiting pressing plate extends and is fixed to the guiding sliding sleeve. The lower end of the guiding sliding shaft is fixedly connected with a pressing plate. A plurality of positioning holes through which kovar pins pass are formed on the pressing plate. Testing holes are respectively formed at the bottom of the housing corresponding to the positions of the respective positioning holes. A testing circuit assembly is installed inside the housing. A plurality of spring probes respectively passing through the respective testing holes are arranged on the testing circuit assembly. The present invention also discloses a method for testing a hemispherical gyroscope sensitive head using the above device.

Description

Technical Field

[0001] The present invention relates to the technical field of hemispherical resonant gyroscope detection, and particularly relates to an orientation test device and a test method for a hemispherical gyro sensitive head. Background Art

[0002] The hemispherical resonant gyroscope is a new type of all-solid-state vibrating gyroscope, which has the advantages of high precision, low noise, large dynamic range, long life, high reliability, etc. At the same time, it has unique features such as the accuracy is not affected by the volume, no calibration is required during long-term operation, and the error is self-calibrated online. It is hailed by the international inertial technology community as an innovative technology that changes the game rules and has broad application prospects in the fields of deep space exploration, strategic weapons, aircraft and ships, underwater long-term submarines, and commercial aerospace.

[0003] The hemispherical resonant gyroscope is composed of parts such as a sensitive head, a buffer circuit, and a control circuit. Among them, the sensitive head is the core component of the hemispherical resonant gyroscope, and its initial performance determines the working stability and accuracy index of the hemispherical resonant gyroscope. After the sensitive head is formed into a sample to be tested through processes such as precision assembly, laser welding, and vacuum exhaust packaging, it is usually necessary to connect the kovar pins of the sensitive head through a buffer circuit and transmit the detection and excitation signals to the control and calculation circuit to screen and test the initial performance index of the sensitive head, and guide the subsequent process for product electrical installation and final delivery.

[0004] Currently, for the screening and testing of the encapsulated sensitive head, by designing a simple buffer circuit board with rectangular jacks and using a manual plugging and unplugging method to insert the rectangular jacks on the buffer circuit board into the kovar pins one by one, it is very easy to have errors in the alignment and plugging and unplugging of the pin holes during the test process, and at the same time, the glass insulator around the kovar pins is easily damaged during the plugging and unplugging process; and during the rectangular jack test process, the buffer circuit board is exposed outside without corresponding shielding protection measures, which affects the accuracy and test efficiency of the test signal. In addition, the manual plugging and unplugging method relies heavily on the operation experience of the test personnel, which greatly affects the production efficiency and test consistency of the sensitive head screening and testing process. Summary of the Invention

[0005] Aiming at the deficiencies of the above-mentioned prior art, the technical problem to be solved by the present invention is: how to provide an orientation test device for a hemispherical gyro sensitive head that is reliable in testing, can reduce the damage to the sensitive head during the test process, and improve the test efficiency.

[0006] To solve the above technical problem, the present invention adopts the following technical solutions:

[0007] An orientation testing device for a hemispherical gyroscope sensitive head includes a housing. Upper and lower openings are respectively provided at the upper and lower ends of the housing. A guiding sliding sleeve fixedly connected to the housing is vertically arranged inside the housing. A guiding sliding shaft that can slide in cooperation with the guiding sliding sleeve along its central axis direction is inserted into the guiding sliding sleeve. The upper and lower ends of the guiding sliding shaft respectively pass through the upper opening and the lower opening. A rotation limiting device is arranged between the guiding sliding shaft and the guiding sliding sleeve to limit the rotation of the guiding sliding shaft around its central axis direction through the rotation limiting device. An adjusting thread extending downward from its upper end is arranged on the shaft body of the guiding sliding shaft along the central axis direction of the guiding sliding shaft. A stroke adjusting nut that is in threaded cooperation with the adjusting thread is sleeved on the shaft body of the guiding sliding shaft above the guiding sliding sleeve. A limiting pressing plate is arranged above the stroke adjusting nut. A sliding shaft through hole is vertically opened on the limiting pressing plate. The diameter of the sliding shaft through hole is larger than the diameter of the guiding sliding shaft. The upper end of the guiding sliding shaft passes through the sliding shaft through hole. One end of the limiting pressing plate extends and is fixedly connected to the guiding sliding sleeve. The upper and lower ends of the stroke adjusting nut respectively abut against the limiting pressing plate and the guiding sliding sleeve. A horizontally arranged pressing plate is fixedly connected to the lower end of the guiding sliding shaft. A plurality of positioning holes that can respectively allow the kovar pins at the bottom of the hemispherical gyroscope sensitive head to be tested to pass through are vertically opened on the pressing plate. The positioning holes are through holes. Testing holes that are arranged on the bottom of the housing and are coaxial with the corresponding positioning holes are respectively arranged at positions corresponding to the positioning holes. A testing circuit assembly is installed inside the housing. A plurality of spring probes that respectively pass through the testing holes and extend below the housing are arranged on the testing circuit assembly.

[0008] When in use, the pressing plate abuts against the bottom of the sensitive head, enabling the kovar pins to pass through the positioning holes, which can avoid damaging the kovar pins. Then, the stroke adjusting nut is rotated. The position of the stroke adjusting nut itself remains unchanged, and it can drive the guiding sliding shaft to descend along its central axis direction. Through the guiding function of the guiding sliding shaft, it can avoid damaging the kovar pins due to plugging and unplugging mistakes during manual operation by humans. Additionally, through the fine adjustment of the stroke adjusting nut, it can ensure that all the spring probes can contact the kovar pins, ensuring the reliability of the test.

[0009] As an optimization, limiting sinking holes extending along the central axis direction of the stroke adjusting nut are respectively concavely arranged on the upper and lower end faces of the stroke adjusting nut. The threaded hole of the stroke adjusting nut is located at the bottom of the limiting sinking hole. A limiting convex head that extends downward and extends into the limiting sinking hole at the upper end of the stroke adjusting nut is formed by the downward protrusion of the bottom surface of the limiting pressing plate at a position corresponding to the stroke adjusting nut. The limiting convex head abuts against the bottom of the corresponding limiting sinking hole. The upper end of the guiding sliding sleeve extends into the limiting sinking hole at the lower end of the stroke adjusting nut and abuts against the bottom of the limiting sinking hole. It can limit the position of the stroke adjusting nut and avoid causing the lifting of the guiding sliding shaft.

[0010] As an optimization, the rotation limiting device includes guiding slide bars fixedly connected to the inner wall of the guiding slide sleeve and evenly spaced in the direction of the center line of the guiding slide sleeve. The guiding slide bars extend along a direction parallel to the center line of the guiding slide sleeve. A plurality of guiding slide grooves are evenly spaced in the direction of the center line of the guiding slide shaft on the shaft body of the guiding slide shaft. The guiding slide grooves extend from the upper end to the lower end of the guiding slide shaft along a direction parallel to the center line of the guiding slide shaft. The upper end of the guiding slide groove communicates with the outside. The number of guiding slide grooves is the same as the number of guiding slide bars. Each guiding slide bar is respectively arranged in the corresponding guiding slide groove and can slide in cooperation with the guiding slide groove along the extending direction of the guiding slide groove. By the sliding cooperation between the guiding slide bar and the guiding slide groove, the rotation of the guiding slide shaft is restricted.

[0011] As an optimization, a top plate is horizontally arranged at the upper end of the guiding slide shaft. A connecting screw hole is recessed vertically on the bottom surface of the top plate. The top plate is threadedly connected to the upper end of the guiding slide shaft through the connecting screw hole. It is convenient to fix the guiding slide shaft and ensure the position of the guiding slide shaft remains unchanged.

[0012] As an optimization, a connecting flange is formed by protruding at a position on the sleeve body of the guiding slide sleeve close to the top end of the guiding slide sleeve and is arranged in a ring around the center line of the guiding slide sleeve. The connecting flange covers the upper opening. The connecting flange is fixedly connected to the outer shell through connecting screws evenly spaced in the direction of the center line of the guiding slide sleeve. Not only is the connection firm, but it can also shield the upper opening of the outer shell and enclose the test circuit assembly in the outer shell.

[0013] The present invention also discloses a testing method for a hemispherical gyroscope sensitive head. First, microscopically observe the outer shell welds, glass insulators, and the rear edges after clamping of the hemispherical gyroscope sensitive head to ensure that the hemispherical gyroscope sensitive head meets the airtightness requirements. Then, use the orientation testing device for the hemispherical gyroscope sensitive head described above to test the hemispherical gyroscope sensitive head. When in use, press the pressure plate against the bottom of the hemispherical gyroscope sensitive head, so that the kovar lead pins on the bottom of the hemispherical gyroscope sensitive head respectively pass through the positioning holes, keep the position of the guiding slide shaft unchanged, and then screw the stroke adjustment nut to control the spring probe to move towards the kovar lead pin direction to ensure that each spring probe contacts the kovar lead pin, and finally perform electrical testing.

[0014] As an optimization, obtain a limit fixing bracket. The limit fixing bracket includes a mounting base. The top surface of the mounting base is a fixed reference surface. There is a head limit hole on the fixed reference surface that can allow the top of the hemispherical gyroscope sensitive head to be clamped. Above the head limit hole, there is a support plate spaced from the mounting base. A support frame fixedly connected to the support plate to support the support plate is also fixedly connected to the mounting base. Above the support plate and corresponding to the position of the head limit hole, there is a stop screw. The rod portion of the stop screw passes vertically through the support plate, and the stop screw is in threaded cooperation with the support plate;

[0015] After the spring probe contacts the kovar lead pin, the top of the hemispherical gyroscope sensing head is clamped into the head limiting hole, and then the stop screw is screwed to make the stop screw abut against the upper end of the guiding slide shaft, thereby pressing the hemispherical gyroscope sensing head tightly against the fixed reference surface. After the orientation testing device is installed, both the sensing head and the orientation testing device are installed on the limiting and fixing bracket. By restricting the sensing head through the mounting base and locking the guiding slide shaft with the stop screw, the stability and reliability of the test are improved, and at the same time, damage to the sensing head during the test is avoided.

[0016] As an optimization, the head limiting hole is a U-shaped hole opened on the side of the mounting base and extending towards the inner side of the mounting base. This facilitates the sliding of the sensing head into the hole from one side.

[0017] Compared with the prior art, the present invention has the following beneficial effects: The present invention adopts a spiral reciprocating linear sliding precision mechanism to achieve precise control of the insertion and extraction stroke, ensuring that the contact strength between the contact probe and the kovar lead pin is evenly controllable, avoiding insertion and extraction mistakes in manual operation, and greatly improving the operation efficiency and operation accuracy of the tester; and the sensing head is fixed by a limiting and fixing bracket, improving the stability and reliability of the test process. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a schematic exploded view of the housing and the guiding slide shaft in the present invention;

[0019] Figure 2 It is a side cross-sectional view of the limiting and fixing bracket in the present invention. DETAILED DESCRIPTION OF THE INVENTION

[0020] Such as Figure 1 And Figure 2As shown in the figure, the orientation test device for the hemispherical gyro sensitive head in this specific embodiment includes a housing 1. Upper and lower openings are respectively provided at the upper and lower ends of the housing 1. A guiding sliding sleeve 2 fixedly connected to the housing 1 is vertically arranged inside the housing 1. A guiding sliding shaft 3 that can slide in cooperation with the guiding sliding sleeve 2 along its central axis direction is inserted into the guiding sliding sleeve 2. The upper and lower ends of the guiding sliding shaft 3 respectively pass through the upper and lower openings. A rotation limiting device is arranged between the guiding sliding shaft 3 and the guiding sliding sleeve 2 to limit the rotation of the guiding sliding shaft 3 around its central axis direction through the rotation limiting device. An adjusting thread extending downward from its upper end is arranged on the shaft body of the guiding sliding shaft 3 along the central axis direction of the guiding sliding shaft. A stroke adjusting nut 4 threadedly engaged with the adjusting thread is sleeved on the shaft body of the guiding sliding shaft 3 above the guiding sliding sleeve 2. A limiting pressure plate 5 is arranged above the stroke adjusting nut 4. A sliding shaft through hole is vertically formed on the limiting pressure plate 5. The diameter of the sliding shaft through hole is larger than the diameter of the guiding sliding shaft 3. The upper end of the guiding sliding shaft 3 passes through the sliding shaft through hole. One end of the limiting pressure plate 5 extends and is fixedly connected to the guiding sliding sleeve 2. The upper and lower ends of the stroke adjusting nut 4 respectively abut against the limiting pressure plate 5 and the guiding sliding sleeve 2. A horizontally arranged pressing plate 6 is fixedly connected to the lower end of the guiding sliding shaft 3. A plurality of positioning holes that can respectively allow the kovar pins at the bottom of the hemispherical gyro sensitive head to be tested to pass through are vertically formed on the pressing plate 6. The positioning holes are through holes. Test holes 7 coaxial with the corresponding positioning holes are respectively formed at the bottom of the housing 1 corresponding to the positions of the respective positioning holes. A test circuit assembly is installed inside the housing 1. A plurality of spring probes respectively passing through the respective test holes 7 and extending below the housing 1 are arranged on the test circuit assembly.

[0021] In this specific embodiment, limiting counterbores extending along the central axis direction of the stroke adjusting nut 4 are respectively recessed on the upper and lower end faces of the stroke adjusting nut 4. The screw hole of the stroke adjusting nut 4 is located at the bottom of the limiting counterbore. A limiting convex head extending downward and inserted into the limiting counterbore at the upper end of the stroke adjusting nut 4 is formed by downward protrusion on the bottom surface of the limiting pressure plate 5 corresponding to the position of the stroke adjusting nut 4. The limiting convex head abuts against the bottom of the corresponding limiting counterbore. The upper end of the guiding sliding sleeve 2 extends into the limiting counterbore at the lower end of the stroke adjusting nut 4 and abuts against its bottom.

[0022] In this specific embodiment, the rotation limiting device includes guiding slide bars 8 fixedly connected to the inner wall of the guiding slide sleeve 2 and evenly spaced in the direction of the center line of the guiding slide sleeve 1. The guiding slide bars 8 extend in a direction parallel to the center line of the guiding slide sleeve 2. A plurality of guiding slide grooves 9 are evenly spaced around the center line of the guiding shaft 3 on the shaft body of the guiding shaft 3. The guiding slide grooves 9 extend from the upper end to the lower end of the guiding shaft 3 in a direction parallel to the center line of the guiding shaft 3. The upper end of the guiding slide groove 9 communicates with the outside. The number of guiding slide grooves 9 is the same as the number of guiding slide bars 8. Each guiding slide bar 8 is respectively arranged in a corresponding guiding slide groove 9 and can slide in cooperation with the guiding slide groove 9 along the extending direction of the guiding slide groove 9.

[0023] In this specific embodiment, a top plate 10 is horizontally arranged at the upper end of the guiding shaft 3. A connecting screw hole is recessed in the bottom surface of the top plate 10 in the vertical direction. The top plate 10 is threadedly connected to the upper end of the guiding shaft 3 through the connecting screw hole.

[0024] In this specific embodiment, a connecting flange 11 is formed by protruding at a position on the sleeve body of the guiding slide sleeve 2 close to the top end of the guiding slide sleeve 2 and is arranged in a ring around the center line of the guiding slide sleeve 2. The connecting flange 11 covers the upper opening. The connecting flange 11 is fixedly connected to the housing 1 through connecting screws evenly spaced around the center line of the guiding slide sleeve 2.

[0025] A testing method for a hemispherical gyroscope sensitive head. First, microscopically observe the housing welds, glass insulators and the rear edges after clamping of the hemispherical gyroscope sensitive head to ensure that the hemispherical gyroscope sensitive head meets the airtightness requirements. Then, use the orientation testing device for the hemispherical gyroscope sensitive head described above to test the hemispherical gyroscope sensitive head. When in use, press the pressing plate 6 against the bottom of the hemispherical gyroscope sensitive head, so that the kovar lead pins on the bottom of the hemispherical gyroscope sensitive head respectively pass through the positioning holes. Keep the position of the guiding shaft 3 unchanged. Then, turn the stroke adjusting nut 4 to control the spring probe to move towards the kovar lead pin direction to ensure that each spring probe contacts the kovar lead pin. Finally, conduct electrical tests.

[0026] Test the static performance parameters such as Q value, frequency difference, amplitude control amount, quadrature control amount, force feedback control amount, etc. and the loop control parameters of the hemispherical gyroscope sensitive head one by one; and test the dynamic performance indicators such as the measurement range, scale factor and nonlinearity, bandwidth, etc. of the hemispherical gyroscope sensitive head, and calculate the performance indicators such as zero bias, zero bias stability and angle random walk under static output according to the vibration gyroscope testing method, and complete the performance screening test of the hemispherical gyroscope sensitive head.

[0027] In this specific embodiment, a limit fixing bracket is obtained. The limit fixing bracket includes an installation base 12. The top surface of the installation base 12 is a fixed reference surface. There is a head limit hole on the fixed reference surface that can allow the top of the hemisphere gyroscope sensitive head to be snapped into. Above the head limit hole, there is a support plate 13 spaced apart from the installation base. On the installation base 12, there is also a support frame 14 fixedly connected to the support plate 13 to support the support plate 13. Above the support plate 13 and corresponding to the position of the head limit hole, there is a stop screw 15. The rod portion of the stop screw 15 passes vertically through the support plate 13, and the stop screw 15 is in threaded cooperation with the support plate 13;

[0028] After the spring probe contacts the kovar lead pin, the top of the hemisphere gyroscope sensitive head is snapped into the head limit hole, and then the stop screw 15 is screwed to make the stop screw 15 abut against the upper end of the guide sliding shaft 3, thereby pressing the hemisphere gyroscope sensitive head against the fixed reference surface.

[0029] In this specific embodiment, the head limit hole is a U-shaped hole opened on the side of the installation base 12 and extending towards the inside of the installation base 12.

[0030] 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 the technical solutions. Those of ordinary skill in the art should understand that any modifications or equivalent replacements made to the technical solutions of the present invention without departing from the purpose and scope of the present technical solution should be covered within the scope of the claims of the present invention.

Claims

1. A directional testing device for a hemispherical gyro sensitive head, characterized in that: It includes a housing. Upper and lower openings are respectively provided at the upper and lower ends of the housing. A guiding sliding sleeve fixedly connected to the housing is vertically arranged inside the housing. A guiding sliding shaft capable of slidingly cooperating with it along the direction of its center line is inserted into the guiding sliding sleeve. The upper and lower ends of the guiding sliding shaft respectively pass through the upper and lower openings. A rotational limiting device is arranged between the guiding sliding shaft and the guiding sliding sleeve so as to be able to limit the rotation of the guiding sliding shaft around its center line direction through the rotational limiting device. An adjusting thread extending downward from its upper end is arranged on the shaft body of the guiding sliding shaft along the center line direction of the guiding sliding shaft. A stroke adjusting nut threadedly engaged with the adjusting thread is sleeved on the shaft body of the guiding sliding shaft above the guiding sliding sleeve. A limiting pressing plate is arranged above the stroke adjusting nut. A sliding shaft through hole is vertically opened on the limiting pressing plate. The diameter of the sliding shaft through hole is larger than the diameter of the guiding sliding shaft. The upper end of the guiding sliding shaft passes through the sliding shaft through hole. One end of the limiting pressing plate extends and is fixedly connected to the guiding sliding sleeve. The upper and lower ends of the stroke adjusting nut respectively abut against the limiting pressing plate and the guiding sliding sleeve. A horizontally arranged pressing plate is fixedly connected to the lower end of the guiding sliding shaft. A plurality of positioning holes respectively enabling the kovar pins at the bottom of the hemispherical gyro sensitive head to be tested to pass through are vertically opened on the pressing plate. The positioning holes are through holes. Test holes concentric with the corresponding positioning holes are respectively opened at the bottom of the housing at positions corresponding to the respective positioning holes. A test circuit assembly is installed inside the housing. A plurality of spring probes respectively passing through the respective test holes and extending below the housing are arranged on the test circuit assembly.

2. The orientation testing device for the hemispherical gyro sensitive head according to claim 1, characterized in that: Limiting sunk holes extending along the center line direction of the stroke adjusting nut are respectively recessed on the upper and lower end faces of the stroke adjusting nut. The threaded hole of the stroke adjusting nut is located at the bottom of the limiting sunk hole. A limiting convex head extending downward and inserted into the limiting sunk hole at the upper end of the stroke adjusting nut is formed by downward protrusion on the bottom surface of the limiting pressing plate at a position corresponding to the stroke adjusting nut. The limiting convex head abuts against the bottom of the corresponding limiting sunk hole. The upper end of the guiding sliding sleeve extends into the limiting sunk hole at the lower end of the stroke adjusting nut and abuts against its bottom.

3. The orientation testing device for the hemispherical gyroscope sensing head according to claim 1, characterized in that: The rotational limiting device includes guiding sliding strips fixedly connected to the inner wall of the guiding sliding sleeve and evenly spaced along the center line direction of the guiding sliding sleeve. The guiding sliding strips extend along a direction parallel to the center line direction of the guiding sliding sleeve. A plurality of guiding sliding grooves are evenly spaced around the center line direction on the shaft body of the guiding sliding shaft. The guiding sliding grooves extend from the upper end of the guiding sliding shaft toward the lower end along a direction parallel to the center line direction of the guiding sliding shaft. The upper end of the guiding sliding groove is communicated with the outside. The number of the guiding sliding grooves is the same as the number of the guiding sliding strips. Each guiding sliding strip is respectively arranged in the corresponding guiding sliding groove and can slide in cooperation with the guiding sliding groove along the extending direction of the guiding sliding groove.

4. The orientation testing device for the hemispherical gyro sensitive head according to claim 1, characterized in that: A top plate is horizontally arranged at the upper end of the guiding sliding shaft. A connecting threaded hole is recessed vertically on the bottom surface of the top plate. The top plate is threadedly connected to the upper end of the guiding sliding shaft through the connecting threaded hole.

5. The orientation testing device for the hemispherical gyro sensing head according to claim 1, characterized in that: On the sleeve body of the guiding sliding sleeve and near the top end of the guiding sliding sleeve, a connecting flange is formed by protruding, which is arranged in a ring around the central axis direction of the guiding sliding sleeve. The connecting flange covers the upper opening, and the connecting flange is fixedly connected to the outer shell through connecting screws evenly spaced along the central axis direction of the guiding sliding sleeve.

6. A testing method for the sensitive head of a hemispherical gyroscope, characterized in that: First, microscopically observe the outer shell weld, glass insulator and the rear edge after clamping of the hemispherical gyroscope sensitive head to ensure that the hemispherical gyroscope sensitive head meets the airtightness requirements. Then, use the orientation testing device for the hemispherical gyroscope sensitive head described in any one of claims 1 to 5 to test the hemispherical gyroscope sensitive head. When in use, abut the pressing plate against the bottom of the hemispherical gyroscope sensitive head, so that the kovar lead pins on the bottom of the hemispherical gyroscope sensitive head respectively pass through the positioning holes, keep the position of the guiding sliding shaft unchanged, and then screw the stroke adjusting nut to control the spring probe to move towards the kovar lead pin direction to ensure that each spring probe contacts the kovar lead pin, and finally conduct electrical testing.

7. The test method of the hemispherical gyroscope sensitive head according to claim 6, characterized in that: Obtain the limit fixing bracket. The limit fixing bracket includes a mounting base. The top surface of the mounting base is the fixed reference surface. There is a head limit hole on the fixed reference surface that can allow the top of the hemispherical gyroscope sensitive head to be inserted. Above the head limit hole, there is a support plate spaced from the mounting base. A support frame is also fixedly connected to the mounting base and fixedly connected to the support plate to support the support plate. Above the support plate and corresponding to the position of the head limit hole, there is a stop screw. The rod part of the stop screw passes through the support plate in the vertical direction, and the stop screw is in threaded cooperation with the support plate; After the spring probe contacts the kovar lead pin, insert the top of the hemispherical gyroscope sensitive head into the head limit hole, and then screw the stop screw to make the stop screw abut against the upper end of the guiding sliding shaft, thereby pressing the hemispherical gyroscope sensitive head tightly against the fixed reference surface.

8. The testing method of the hemispherical gyroscope sensitive head according to claim 7, characterized in that: The head limit hole is a U-shaped hole opened on the side of the mounting base and extending towards the inner side of the mounting base.

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