Auxiliary clamping device for detecting radial looseness of oxygen bomb thread

Abstract

The utility model relates to an auxiliary clamping device for detecting the radial looseness 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 radial 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 radial direction. According to the auxiliary clamping device, the measurement efficiency is improved, the operation steps are simplified, stable radial 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 radial 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 the radial looseness and the axial looseness of the threads. 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 radial 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 radial looseness of the oxygen bomb thread. Although this apparatus can meet the basic measurement requirements of the oxygen bomb, the process of measuring the radial looseness of the oxygen bomb thread requires the operator to hold the test ring and apply radial 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 radial 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 radial looseness of oxygen bomb threads. This device can solve the problems in the prior art where the operation is cumbersome and the operator cannot apply a stable radial force to the connecting ring by manually moving the test ring. This results in the possibility of springback errors and uneven looseness, leading to a high risk of distortion in the values ​​measured by the operator.

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

[0006] An auxiliary clamping device for detecting the radial 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 a radial pushing assembly disposed on the top of the measuring platform and located on one side of the driving assembly for radially pushing the connecting ring of the oxygen bomb.

[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 radially.

[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 radial pushing assembly includes a lifting frame, which is disposed on the top of the measuring platform and located on one side 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, a second pressure sensor is provided on one side surface of the connecting ring pusher, and the second pressure sensor is electrically connected to the second push rod.

[0015] Preferably, both the first pressure sensor and the second pressure sensor are thin-film pressure sensors.

[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 bomb body is fixed by the fixing component, and a radial thrust is applied to the connecting ring of the oxygen bomb to a set thrust value based on the radial pushing component. Then, a set of radial looseness values ​​of the oxygen bomb thread are measured. The average of the multiple sets of radial looseness values ​​of the oxygen bomb thread measured during the rotation intervals is used to obtain the radial looseness value of the oxygen bomb thread. This auxiliary clamping device improves the measurement efficiency, simplifies the operation steps, and can apply a stable radial 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 radial 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 radial 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 radial looseness of the oxygen bomb thread in the embodiment (taken from...). Figure 2 ).

[0021] Figure 4 This is an isometric structural diagram of the auxiliary clamping device used to detect the radial looseness of the oxygen bomb thread in the embodiment.

[0022] Figure 5 This is a partial enlarged view of the auxiliary clamping device used to detect the radial 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 321, first pressure sensor 322, radial push assembly 40, lifting frame 41, second push rod 42, connecting ring push part 421, second pressure sensor 422, 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 radial looseness of oxygen bomb threads, which can be applied to detect the radial 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 radial 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 a radial push assembly 40, which is disposed on top of the measuring platform 10 and located on one side of the drive assembly 20, for radially pushing the connecting ring 62 of the oxygen bomb 60.

[0032] Specifically, the aforementioned deformation measurement sensor and online projection image measuring instrument 50 are two different types of instruments used to detect minute radial 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 radial 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. A radial force is applied to the connecting ring by the radial 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 calculated as the radial 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 321. Specifically, the first push rod 32 is a servo electric push rod, and the projectile fixing member 321 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 321 is connected to the output shaft of the servo electric push rod. The first push rod 32 can push the projectile fixing member 321 to move synchronously in the radial 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 surface of the bomb body fixing component 321 that can contact the bomb body 61 is embedded with a first pressure sensor 322. The first push rod 32 is an electric push rod with controllable thrust limit. The first pressure sensor 322 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 push or stop pushing based on the pressure signal fed back by the first pressure sensor 322, so that the pair of bomb body fixing components 321 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 aspects remain the same, the fixing component 30 differs. In this embodiment, the fixing component 30 includes an industrial suction cup with adjustable adsorption force (replacing the vacuum suction cup of the above embodiment). 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 causing the oxygen bomb 60 adsorbed on the top of the industrial suction cup to rotate. 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 radial pushing assembly 40 includes a lifting frame 41 disposed on the top of the measuring platform 10 and located on one side 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 421. Specifically, the connecting ring pusher 421 is an arc-shaped push plate that can fit the side 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 radial direction. The output end of the latter is connected to the connecting ring pusher 421. The lifting frame 41 adjusts the position of the connecting ring pusher 421 in the vertical direction so that it is within the height range of the connecting ring 62 (in order to make the thrust applied to the connecting ring 62 relatively uniform, the connecting ring pusher 421 should preferably contact the middle part of the side of the connecting ring 62). The second push rod 42 on the lifting frame 41 can drive the connecting ring pusher 421 in the radial direction to apply a set thrust to the connecting ring 62.

[0041] Furthermore, to ensure that the radial pushing assembly 40 can accurately apply the set radial thrust to the connecting ring 62, a second pressure sensor 422 is provided on one side surface of the connecting ring pusher 421 that can contact the connecting ring 62. The second push rod 42 is an electric push rod with controllable thrust limit. The second pressure sensor 422 is electrically connected to the second push rod 42. Under the premise that the thrust value of the second push rod 42 is set, the second push rod 42 can perform pushing or stopping pushing based on the pressure signal fed back by the second pressure sensor 422, so that the connecting ring pusher 421 can apply the set thrust to the connecting ring 62, thereby avoiding insufficient thrust causing the connecting ring 62 and the projectile 61 to not loosen the threads, or excessive thrust damaging the thread structure or causing the connecting ring 62 to deform, resulting in inaccurate radial looseness measurement values.

[0042] Furthermore, to improve the efficiency of the above-mentioned device in measuring the radial looseness of the oxygen bomb, the radial pushing components 40 can be arranged in pairs and symmetrically distributed on both sides of the drive component 20, so that the connecting ring 62 of the oxygen bomb 60 can be pushed to the left or to the right by either radial pushing component 40. By using different radial pushing components 40 in turn, the oxygen bomb 60 can be rotated at a smaller angle and the same number of radial looseness values ​​can be obtained, thereby improving the measurement efficiency.

[0043] In order to ensure that the aforementioned projectile fixing member 321 and connecting ring pusher 421 can apply thrust evenly to the oxygen bomb 60 and avoid stress concentration, the aforementioned first pressure sensor 322 and second pressure sensor 422 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 321 and the connecting ring pusher 421 on the side surface that is in contact with 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.

[0044] Based on the above implementation, in order to ensure that the online projection image measuring instrument 50 can clearly detect the radial 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 in which the radial pushing component 40 pushes 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 radial loosening value.

[0045] When using the above-mentioned auxiliary clamping device for detecting the radial looseness of oxygen bomb threads:

[0046] Ensure that the drive assembly 20, the fixed assembly 30, and the radial push assembly 40 are in their initial positions or states;

[0047] Place the oxygen bomb 60 to be tested at the center of the anti-slip part 221;

[0048] After the first push rod 32 drives the projectile fixing member 321 to fix the projectile body 61 of the oxygen bomb 60 with a set thrust, the second push rod 42 is activated to apply a set thrust to the connecting ring 62 of the oxygen bomb 60 in the radial direction.

[0049] Based on either of the two types of instruments mentioned above, which are used to detect minute radial deformation of oxygen bomb threads, a set of radial loosening values ​​for oxygen bomb 60 threads are output.

[0050] The second push rod 42 is reversed to cancel the thrust, and the first push rod 32 is reversed to release the bomb body 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 radial looseness values ​​of the thread of the oxygen bomb 60 are output. By calculating the average of the multiple sets of radial looseness values ​​of the thread of the oxygen bomb 60, the measured value of the radial looseness of the thread of the oxygen bomb 60 is obtained.

[0051] Using the above-described oxygen bomb thread radial looseness detection method has at least the following beneficial effects:

[0052] 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 a radial thrust is applied to the connecting ring of the oxygen bomb 60 to a set thrust value based on the radial pushing component 40. Then, a set of radial looseness values ​​of the thread of the oxygen bomb 60 are measured. The average of the multiple sets of radial looseness values ​​of the thread of the oxygen bomb 60 measured during the rotation intervals is used to obtain the radial looseness value of the thread of the oxygen bomb 60. This auxiliary clamping device improves the measurement efficiency, simplifies the operation steps, and can apply a stable radial force to the connecting ring, avoiding the problem of high risk of value distortion caused by manual measurement by the operator.

[0053] 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 radial looseness of oxygen bomb threads, 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 oxygen bomb body; and a radial 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 radially.

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 radially.

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 radial pushing assembly includes a lifting frame, which is disposed on the top of the measuring platform and located on one side 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, A second pressure sensor is provided on one side surface of the connecting ring pusher, and the second pressure sensor is electrically connected to the second push rod.

10. The auxiliary clamping device as described in claim 9, characterized in that, Both the first pressure sensor and the second pressure sensor are thin-film pressure sensors.

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