Auxiliary clamping device for detecting oxygen bomb thread axial loosening degree

Abstract

The utility model relates to an auxiliary clamping device for detecting the axial loosening degree of an oxygen bomb thread. The auxiliary clamping device comprises a measuring platform, the driving assembly is arranged at the top of the measuring platform, and the output end of the driving assembly is used for driving the oxygen bomb to rotate; the fixing assembly is arranged at the top of the measuring platform and used for fixing a bomb body of the oxygen bomb; the axial pushing assembly is arranged at the top of the measuring platform, located on one side of the driving assembly and used for pushing the connecting ring of the oxygen bomb in the axial direction. According to the auxiliary clamping device, the measurement efficiency is improved, the operation steps are simplified, stable axial force can be applied to the connecting ring, and the problem that the measured numerical value distortion risk is high due to manual measurement of an operator is solved.

Description

Technical Field

[0001] This application belongs to the field of oxygen bomb testing technology, and specifically relates to an auxiliary clamping device for detecting the axial looseness of oxygen bomb threads. Background Technology

[0002] An oxygen bomb calorimeter is an instrument used to determine the calorific value of substances that can burn completely in oxygen. The oxygen bomb, as the combustion chamber of the calorimeter, must withstand the high-temperature and high-pressure environment generated during the combustion of the internal sample. An oxygen bomb typically consists of a bomb body, a gland equipped with a nozzle and valve, and a connecting ring for connecting the gland to the bomb body. The connecting ring and the bomb body are connected by a threaded connection. To ensure the oxygen bomb can safely complete the determination of the sample's calorific value, the looseness of the threads needs to be tested. The testing of thread looseness typically includes testing for both axial thread looseness and thread axial deformation. These two indicators reflect the degree of deformation of the threads between the connecting ring and the bomb body in different directions, respectively.

[0003] In existing technology, the axial looseness of the oxygen bomb thread is measured using the test apparatus specified in MT / T737-2007 "Specification for Safety Performance Inspection of Oxygen Bomb in Calorimeter". This test apparatus includes a measuring platform; an oxygen bomb holder mounted on the measuring platform for fixing the oxygen bomb; a test ring for moving the threaded connecting ring of the oxygen bomb; and a dial indicator for measuring the axial looseness of the oxygen bomb thread. Although this apparatus can meet the basic measurement requirements of the oxygen bomb, the process of measuring the axial looseness of the oxygen bomb thread requires the operator to hold the test ring and apply axial force to the oxygen bomb to loosen the thread structure before taking a reading with the dial indicator. The entire process is not only cumbersome, but the operator's manual movement of the test ring cannot apply a stable axial force to the connecting ring, which may result in springback errors and inconsistent loosening degrees, leading to a high risk of inaccurate measurements. Summary of the Invention

[0004] Based on the aforementioned technical needs, this application provides an auxiliary clamping device for detecting the axial looseness of an oxygen bomb thread. This device can solve the problems in the prior art where operation is cumbersome and the operator cannot apply a stable axial force to the connecting ring by manually moving the test ring, which may result in springback errors and inconsistent looseness, leading to a high risk of distortion in the measured values.

[0005] To achieve the above objectives, the technical solution of this application is as follows:

[0006] An auxiliary clamping device for detecting the axial looseness of an oxygen bomb thread includes a measuring platform; a driving assembly disposed on the top of the measuring platform, the output end of the driving assembly being used to drive the oxygen bomb to rotate; a fixing assembly disposed on the top of the measuring platform for fixing the oxygen bomb body; and an axial pushing assembly disposed on the top of the measuring platform and located on one side of the driving assembly for pushing the connecting ring of the oxygen bomb axially.

[0007] Preferably, the driving assembly includes a stepper motor and an oxygen bomb support base. The oxygen bomb support base is rotatably disposed on the top of the measuring platform. The top of the oxygen bomb support base is used to place the oxygen bomb body. The stepper motor is embedded in the measuring platform, and its drive shaft is coaxially connected to the oxygen bomb support base.

[0008] Preferably, the oxygen bomb support includes a lifting platform and a connecting base. The connecting base has a cylindrical structure and is rotatably connected to the measuring platform. The drive shaft of the stepper motor is coaxially connected to the connecting base. A drive motor is installed inside the connecting base. The lifting platform and the side wall of the connecting base are in sliding frictional engagement. The drive shaft of the drive motor is in drive engagement with the lifting platform through a threaded structure. The drive motor is used to drive the lifting platform to move vertically.

[0009] Preferably, the top of the lifting platform is provided with an anti-slip part.

[0010] Preferably, the anti-slip part includes a rubber anti-slip coating fixed to the top of the lifting platform or a vacuum suction cup coaxially fixed to the top of the lifting platform.

[0011] Preferably, the fixing component includes at least one pair of brackets, any pair of brackets being disposed on the top of the measuring platform and symmetrically distributed on both sides of the driving component; a first push rod is disposed at the top of the bracket, and a projectile fixing component is disposed at the output end of the first push rod, the first push rod being used to synchronously drive the projectile fixing component to move axially.

[0012] Preferably, a first pressure sensor is provided on one side surface of the projectile fixing member, and the first pressure sensor is electrically connected to the first push rod.

[0013] Preferably, the axial pushing assembly includes at least one pair of lifting frames, any pair of lifting frames being disposed on the top of the measuring platform and symmetrically distributed on both sides of the driving assembly. The output end of the lifting frame is provided with a second push rod, and the output end of the second push rod is provided with a connecting ring pusher. The lifting frame is used to drive the second push rod to move axially, and the second push rod is used to drive the connecting ring pusher to move radially.

[0014] Preferably, the connecting ring pusher includes a third push rod with adjustable thrust and a lever. The fixed end of the third push rod is disposed at the output end of the second push rod, and the lever is disposed at the output end of the third push rod. The third push rod is used to drive the lever to move axially.

[0015] Preferably, a second pressure sensor is provided on one side surface of the lever, and the second pressure sensor is electrically connected to the third push rod.

[0016] By adopting the above technical solution, compared with the prior art, this application has at least the following beneficial effects:

[0017] The oxygen bomb is driven to rotate intermittently on the top of the measuring platform by the driving component. During the rotation intervals, the oxygen bomb body is fixed by the fixing component, and the axial pushing component applies an axial thrust to the connecting ring of the oxygen bomb to a set thrust value. Then, a set of axial looseness values ​​of the oxygen bomb thread are measured. The axial looseness value of the oxygen bomb thread is obtained by averaging the multiple sets of axial looseness values ​​of the oxygen bomb thread measured during the rotation intervals. This auxiliary clamping device improves the measurement efficiency, simplifies the operation steps, and can apply a stable axial force to the connecting ring, avoiding the problem of high risk of value distortion caused by manual measurement by the operator. Attached Figure Description

[0018] Figure 1 This is an assembly diagram of the auxiliary clamping device used to detect the axial looseness of the oxygen bomb thread in the embodiment.

[0019] Figure 2 This is a cross-sectional view of the auxiliary clamping device AA used to detect the axial looseness of the oxygen bomb thread in the embodiment.

[0020] Figure 3 This is a partially enlarged cross-sectional view of the auxiliary clamping device used to detect the axial looseness of the oxygen bomb thread in the embodiment (taken from...). Figure 2 ).

[0021] Figure 4 This is a schematic diagram of the isometric structure of the auxiliary clamping device used to detect the axial looseness of the oxygen bomb thread in the embodiment.

[0022] Figure 5 This is a partially enlarged view of the auxiliary clamping device used to detect the axial looseness of the oxygen bomb thread in the embodiment (taken from...). Figure 4 ).

[0023] In the figure: measuring platform 10, drive assembly 20, stepper motor 21, oxygen bomb support 22, anti-slip part 221, lifting platform 222, drive motor 223, connecting base 224, fixing assembly 30, bracket 31, first push rod 32, bomb body fixing part 33, first pressure sensor 331, axial push assembly 40, lifting frame 41, second push rod 42, connecting ring push part 43, third push rod 431, lever 432, second pressure sensor 433, online projection image measuring instrument 50, oxygen bomb 60, bomb body 61, connecting ring 62. Detailed Implementation

[0024] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other. The technical solutions of this application will be further described below with reference to the accompanying drawings of the embodiments, and this application is not limited to the following specific implementation methods.

[0025] It should be understood that the same or similar reference numerals in the accompanying drawings of the embodiments correspond to the same or similar components. In the description of this application, it should be understood that if terms such as "upper," "lower," "inner," "outer," "left," "right," "front," "rear," "top," and "bottom" indicate directions or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, they are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the structure or component referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, the terms describing positional relationships in the accompanying drawings are for illustrative purposes only and should not be construed as limitations on this patent. Those skilled in the art can understand the specific meaning of the above terms according to the specific circumstances.

[0026] The following is in conjunction with the appendix Figure 1 To be continued Figure 5 The present application will be further described in detail with reference to specific embodiments.

[0027] This application discloses an auxiliary clamping device for detecting the axial looseness of oxygen bomb threads, which can be applied to detect the axial looseness of oxygen bomb threads.

[0028] The device includes a measurement platform 10, which provides the horizontal plane required for setting up a deformation measurement sensor or online projection image measuring instrument 50 for testing the axial looseness of oxy-bomb threads.

[0029] It also includes a drive assembly 20, which is located on the top of the measuring platform 10. The output of the drive assembly 20 is used to drive the oxygen bomb 60 to rotate.

[0030] It also includes a fixing component 30, which is disposed on the top of the measuring platform 10 for fixing the projectile body 61 of the oxygen bomb 60;

[0031] It also includes an axial pushing component 40, which is disposed on the top of the measuring platform 10 and located on one side of the drive component 20, for pushing the connecting ring 62 of the oxygen bomb 60 axially.

[0032] Specifically, the aforementioned deformation measurement sensor and online projection image measuring instrument 50 are two different types of instruments used to detect minute axial deformation of the oxygen bomb thread. When an eddy current type minute deformation sensor, such as the PC2073 model, used in the automatic oxygen bomb safety performance testing instrument, is selected, the top of the aforementioned measuring platform 10 should also be equipped with a corresponding structure for adjusting the eddy current type minute deformation sensor. This structure specifically includes a slide rod that is adjacent to one side of the bomb body 61 and synchronously connected to the output end of the drive assembly 20. The slide rod is set in the vertical direction, and an adjustment seat is slidably provided on the surface of the slide rod along the axial direction. A mounting seat is provided on one side of the adjustment seat that can be rotated up and down. This mounting seat is used to install the aforementioned eddy current type minute deformation sensor (not shown in the attached figure). When an online projection image measuring instrument 50, such as the Keyence TM-X5000 series model, is selected, a pair of such online projection image measuring instruments 50 are built on the top of the measuring platform 10 and symmetrically distributed on both sides of the aforementioned drive assembly 20 to form the projection surface of the oxygen bomb 60. The principle of this model of online projection image measuring instrument 50 for measuring the axial looseness of the thread of oxygen bomb 60 is as follows: taking advantage of the online projection image measuring instrument 50's ability to accurately and directly measure the tolerances and clearances of precision structures, the oxygen bomb 60 is placed between a pair of online projection measuring instruments and driven to rotate in place by the drive assembly 20. During the rotation, the drive is interrupted several times, and the body 61 of the oxygen bomb 60 is fixed by the fixing assembly 30 during the intervals. The axial force is applied to the connecting ring by the axial pushing assembly 40. The online projection image measuring instrument 50 detects and outputs the movement distance of the point on the projection of the connecting ring relative to the point on the projection of the body 61 in the projection contour of the oxygen bomb 60 after the force is applied. Then, the average of multiple sets of data collected after the oxygen bomb 60 rotates one revolution is used as the axial looseness of the thread of the oxygen bomb 60.

[0033] In one specific embodiment, the measuring platform 10 is a box with a hollow bottom. The driving component 20 includes a stepper motor 21. The fixed end of the stepper motor 21 is embedded in the top surface inside the measuring platform 10. In order to enable the oxygen bomb 60 to rotate smoothly, an oxygen bomb support 22 is coaxially provided on the drive shaft of the stepper motor 21. The oxygen bomb support 22 is rotatably connected to the top surface of the measuring platform 10 through a bearing and can support the rotation of the oxygen bomb 60.

[0034] Furthermore, to drive the oxygen bomb 60 up and down via a lifting mechanism, thereby fine-tuning the position of the oxygen bomb 60's projection in the height direction and adjusting the position of the projection image of the oxygen bomb 60 by the online projection image measuring instrument 50, the aforementioned oxygen bomb support 22 includes a connecting base 224 mounted on the drive shaft of the stepper motor 21, a drive motor 223 mounted on the top of the connecting base 224, and a lifting platform 222 mounted on the drive shaft of the drive motor 223. The connecting base 224 is cylindrical, with its bottom surface coaxially fixed to the drive shaft of the stepper motor 21. Its side surface is rotatably connected to the top surface of the measuring platform 10 via bearings. Its inner surface is in sliding friction engagement with the cylindrical lifting platform 222. The drive motor 223 is a servo motor, with a threaded structure or connecting screw machined at one end of its drive shaft. A threaded hole is provided at the bottom center of the lifting platform 222 and is threadedly connected to the drive shaft of the drive motor 223. The servo motor can drive the lifting platform 222 to rotate forward or reverse, so that the lifting platform 222 rotates and rises or falls under the action of the threaded structure. When the servo motor does not output power, the friction between the lifting platform 222 and the connecting base 224 keeps the lifting platform 222 locked in the vertical direction. As a result, when the stepper motor 21 drives the connecting base 224 to rotate relative to the measuring platform 10, the lifting platform 222 only rotates synchronously with the connecting base 224 and does not move up or down.

[0035] Furthermore, to ensure the oxygen bomb 60 can rotate smoothly and in place, an anti-slip part 221 is provided on the top of the lifting platform 222 to increase the friction between its top surface and the oxygen bomb 60, ensuring that the oxygen bomb 60 can rotate with the drive shaft of the stepper motor 21 and preventing the oxygen bomb 60 from slipping and deviating. More specifically, the anti-slip part 221 can be a rubber anti-slip coating laid on the top surface of the lifting platform 222, or it can be a vacuum suction cup coaxially fixed to the top surface of the lifting platform 222.

[0036] Furthermore, the aforementioned fixing component 30 includes at least one pair of brackets 31. Any pair of brackets 31 is symmetrically distributed on both sides of the aforementioned driving component 20 on the upper part of the top surface of the measuring platform 10. In a preferred embodiment, the axis of symmetry is the extension line of the drive shaft of the aforementioned stepper motor 21. The top end of the bracket 31 is respectively provided with a first push rod 32, and the output end of the first push rod 32 is provided with a projectile fixing member 33. Specifically, the first push rod 32 is a servo electric push rod, and the projectile fixing member 33 is a push plate or claw with one side arc-shaped. The arc-shaped side is used to fit and hold the projectile 61 of the oxygen bomb 60, and the other side of the projectile fixing member 33 is connected to the output shaft of the servo electric push rod. The first push rod 32 can push the projectile fixing member 33 to move synchronously along the axial direction.

[0037] Furthermore, to ensure that the fixing component 30 can adjust the thrust according to the specifications of the oxygen bomb 60 to be tested, so as to fix oxygen bombs 60 of different diameters, the first pressure sensor 331 is embedded on the side surface of the bomb body fixing component 33 that can contact the bomb body 61. The first push rod 32 is an electric push rod with controllable thrust limit. The first pressure sensor 331 is electrically connected to the first push rod 32. Under the premise that the thrust value of the first push rod 32 is set, the first push rod 32 can perform pushing or stopping pushing based on the pressure signal fed back by the first pressure sensor 331, so that the pair of bomb body fixing components 33 can hold the bomb body 61 with the set thrust, thereby avoiding insufficient thrust causing the bomb body 61 to loosen or excessive thrust damaging the first push rod 32 or the oxygen bomb 60.

[0038] In another embodiment, the following differences exist from the above embodiments:

[0039] While other structural elements remain the same, the fixing component 30 differs. In this embodiment, the fixing component 30 includes an industrial suction cup with adjustable adsorption force. This industrial suction cup is coaxially fixed to the upper end of the drive shaft of the stepper motor 21 with its adsorption surface facing upwards. The stepper motor 21 can drive the industrial suction cup to rotate around its axis, thereby rotating the oxygen bomb 60 adsorbed on the top of the industrial suction cup. When it is necessary to remove or replace the oxygen bomb 60, the adsorption force of the industrial suction cup can be adjusted to ensure that it firmly adheres to the bottom of the bomb body 61 or releases the oxygen bomb 60.

[0040] In a preferred embodiment, the axial pushing assembly 40 includes at least one pair of lifting frames 41 disposed on the top of the measuring platform 10. Any pair of lifting frames 41 are symmetrically distributed on both sides of the driving assembly 20. The output end of the lifting frame 41 is provided with a second push rod 42, and the output end of the second push rod 42 is provided with a connecting ring pusher 43. Specifically, in a preferred embodiment, the connecting ring pusher 43 is a component whose one side surface can be horizontally attached to the bottom surface of the connecting ring 62. The lifting frame 41 includes a servo electric push rod that can output in the vertical direction, and its output end is provided with another servo electric push rod (i.e., the second push rod 42) that can output in the axial direction. The output end of the latter is connected to the connecting ring pusher 43. A pair of lifting frames 41 can push the connecting ring pusher 43 upward in the vertical direction with the same thrust, so that it can be within the height range of the connecting ring 62 (in order to make the thrust applied to the connecting ring 62 relatively uniform, a pair of connecting ring pushers 43 preferably contact the bottom surface of the connecting ring simultaneously and apply the same thrust upward simultaneously). The second push rod 42 on the lifting frame 41 can drive the connecting ring pusher 43 to move closer to the bottom of the connecting ring 62 in the axial direction, so as to adjust the position of the connecting ring pusher 43 and the contact area between the connecting ring pusher 43 and the bottom of the connecting ring 62.

[0041] Furthermore, to ensure that the axial pushing assembly 40 can accurately apply the set axial thrust to the connecting ring 62, the connecting ring pushing member 43 includes a third push rod 431 and a lever 432. The third push rod 431 is a miniature servo electric push rod with adjustable thrust (it has a smaller pushing stroke and adjustable thrust function compared to the lifting frame 41 and the second push rod 42). The fixed end of the third push rod 431 is located at the output end of the second push rod 42, and the lever 432 is located at the output end of the third push rod 431. The third push rod 431 can drive the lever 432 to move axially upward with a small stroke. The top surface of 2 is a plane parallel to the bottom surface of the connecting ring, and the part of the top surface of the lever 432 that can fully contact the bottom surface of the connecting ring is provided with a second pressure sensor 433. Under the premise that the thrust value of the third push rod 431 is set, the third push rod 431 can perform pushing or stopping pushing based on the pressure signal fed back by the second pressure sensor 433, so that the lever 432 can apply the set thrust to the connecting ring 62, thereby avoiding insufficient thrust causing the connecting ring 62 and the spring 61 to not loosen the thread, or excessive thrust damaging the thread structure or causing the connecting ring 62 to deform, resulting in inaccurate thread axial looseness measurement value.

[0042] In order to ensure that the above-mentioned projectile fixing member 33 and connecting ring pusher 43 can apply the thrust evenly to the oxygen bomb 60 and avoid stress concentration, the first pressure sensor 331 and the second pressure sensor 433 are preferably thin-film pressure sensors. Their thin-film pressure detection ends are respectively embedded or attached to the surface of the projectile fixing member 33 and the lever 432 on the side surface that contacts the oxygen bomb 60. The thin-film pressure detection end can not only avoid the problem of thrust concentration, but also help to improve the pressure feedback accuracy.

[0043] Based on the above implementation method, in order to ensure that the online projection image measuring instrument 50 can clearly detect the phenomenon of axial loosening of the thread between the connecting ring 62 and the projectile 61, it is necessary to ensure that the projection surface of the oxygen bomb 60 is parallel to the direction of the axial pushing component 40 pushing the connecting ring 62. When the oxygen bomb 60 is pushed, the connecting ring 62 and the projectile 61 of the oxygen bomb 60 will loosen and displace in a direction parallel to the projection surface, so that the online projection image measuring instrument 50 can output the axial loosening value.

[0044] When using the above-mentioned auxiliary clamping device for detecting the axial looseness of the oxygen bomb thread:

[0045] Ensure that the drive assembly 20, the fixed assembly 30, and the axial push assembly 40 are in their initial positions or states;

[0046] Place the oxygen bomb 60 to be tested at the center of the anti-slip part 221;

[0047] After the first push rod 32 drives the projectile fixing member 33 to fix the projectile 61 part of the oxygen bomb 60 with a set thrust, the second push rod 42 is activated to apply the set thrust to the connecting ring 62 of the oxygen bomb 60 in the axial direction.

[0048] Based on either of the above two types of instruments used to detect minute axial deformation of oxygen bomb threads, a set of axial loosening values ​​for oxygen bomb 60 threads are output.

[0049] The second push rod 42 is operated in reverse to cancel the thrust, and the first push rod 32 is operated in reverse to release the bomb 61. The stepper motor 21 is started to drive the oxygen bomb 60 to rotate in place at a set rotation angle, preferably 45°. After the set rotation angle is reached, the above steps are repeated until the rotation angle of the oxygen bomb 60 relative to the initial rotation position is not less than 180°. Multiple sets of axial looseness values ​​of the thread of the oxygen bomb 60 are output. By calculating the average of the multiple sets of axial looseness values ​​of the thread of the oxygen bomb 60, the measured value of the axial looseness of the thread of the oxygen bomb 60 is obtained.

[0050] Using the above-mentioned oxygen bomb thread axial looseness detection method has at least the following beneficial effects:

[0051] The oxygen bomb 60 is driven to rotate intermittently on the top of the measuring platform 10 by the drive component 20. During the rotation intervals, the bomb body 61 of the oxygen bomb 60 is fixed by the fixing component 30, and the axial push component 40 applies an axial thrust to the connecting ring of the oxygen bomb 60 to a set thrust value. Then, a set of axial looseness values ​​of the thread of the oxygen bomb 60 are measured. The axial looseness value of the thread of the oxygen bomb 60 is obtained by averaging the multiple sets of axial looseness values ​​of the thread of the oxygen bomb 60 measured during the rotation intervals. This auxiliary clamping device improves the measurement efficiency, simplifies the operation steps, and can apply a stable axial force to the connecting ring, avoiding the problem of high risk of value distortion caused by manual measurement by the operator.

[0052] Obviously, the above embodiments of this application are merely examples for clearly illustrating this application, and are not intended to limit the implementation of this application. Those skilled in the art can make other variations or modifications based on the above description. It is neither necessary nor possible to exhaustively list all possible implementations here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. An auxiliary clamping device for detecting the axial looseness of an oxygen bomb thread, characterized in that, It includes a measuring platform; a driving component, disposed on the top of the measuring platform, the output end of the driving component being used to drive the oxygen bomb to rotate; a fixing component, disposed on the top of the measuring platform, being used to fix the body of the oxygen bomb; and an axial pushing component, disposed on the top of the measuring platform and located on one side of the driving component, being used to push the connecting ring of the oxygen bomb axially.

2. The auxiliary clamping device as described in claim 1, characterized in that, The drive assembly includes a stepper motor and an oxygen bomb support. The oxygen bomb support is rotatably mounted on the top of the measuring platform. The top of the oxygen bomb support is used to place the oxygen bomb body. The stepper motor is embedded in the measuring platform, and its drive shaft is coaxially connected to the oxygen bomb support.

3. The auxiliary clamping device as described in claim 2, characterized in that, The oxygen bomb support includes a lifting platform and a connecting base. The connecting base has a cylindrical structure and is rotatably connected to the measuring platform. The drive shaft of the stepper motor is coaxially connected to the connecting base. A drive motor is installed inside the connecting base. The lifting platform and the side wall of the connecting base are in sliding frictional engagement. The drive shaft of the drive motor is in drive engagement with the lifting platform through a threaded structure. The drive motor is used to drive the lifting platform to move vertically.

4. The auxiliary clamping device as described in claim 3, characterized in that, The top of the lifting platform is equipped with an anti-slip section.

5. The auxiliary clamping device as described in claim 4, characterized in that, The anti-slip part includes a rubber anti-slip coating fixed to the top of the lifting platform or a vacuum suction cup coaxially fixed to the top of the lifting platform.

6. The auxiliary clamping device as described in claim 1, characterized in that, The fixing component includes at least one pair of brackets, any pair of brackets being disposed on the top of the measuring platform and symmetrically distributed on both sides of the driving component; a first push rod is disposed at the top of the bracket, and a projectile fixing component is disposed at the output end of the first push rod, the first push rod being used to synchronously drive the projectile fixing component to move axially.

7. The auxiliary clamping device as described in claim 6, characterized in that, A first pressure sensor is provided on one side surface of the projectile fixing component, and the first pressure sensor is electrically connected to the first push rod.

8. The auxiliary clamping device as described in claim 7, characterized in that, The axial pushing assembly includes at least one pair of lifting frames. Any pair of lifting frames is disposed on the top of the measuring platform and symmetrically distributed on both sides of the driving assembly. The output end of the lifting frame is provided with a second push rod, and the output end of the second push rod is provided with a connecting ring pusher. The lifting frame is used to drive the second push rod to move axially, and the second push rod is used to drive the connecting ring pusher to move radially.

9. The auxiliary clamping device as described in claim 8, characterized in that, The connecting ring pusher includes a third push rod with adjustable thrust and a lever. The fixed end of the third push rod is located at the output end of the second push rod, and the lever is located at the output end of the third push rod. The third push rod is used to drive the lever to move axially.

10. The auxiliary clamping device as described in claim 9, characterized in that, A second pressure sensor is provided on one side surface of the lever, and the second pressure sensor is electrically connected to the third push rod.

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