Auxiliary calibration tool

Abstract

A protective cover of a magnetic ruler is opened, a rotating pipe of the auxiliary calibration tool is held by a hand, one end of the rotating pipe and a supporting piece connected with the rotating pipe are fed into the protective cover, the peripheral wall of the rotating pipe is rotationally connected with a connecting part of the supporting piece, and the connecting part of the supporting piece surrounds the abutting end of the supporting piece; the rotating pipe is adjusted to the abutting end of the supporting piece to abut against the top of the protective cover, the two ends of the rotating pipe are located on the two sides of the connecting part respectively, and the two ends of the rotating pipe can take the supporting piece supported by the protective cover as a supporting point to play a lever role. The pressing piece detachably connected with one end of the rotating pipe abuts against the connecting rod of the magnetic ruler in the protective cover, the end abutting against the connecting rod rotates through the lever effect and pushes the connecting rod to move downwards, calibration is completed, efficiency is high, time is consumed, normal production can be conducted after calibration is completed, the production halt time of a cold rolling production line is shortened, and the production efficiency is improved. The technical problem that the production benefit of a cold rolling production line is affected is solved to a certain extent.

Description

Technical Field

[0001] This application belongs to the technical field of hydraulic cylinder calibration, and particularly relates to an auxiliary calibration tooling. Background Art

[0002] The hydraulic cylinder with a magnetic scale is one of the most commonly used spare parts in the cold rolling and tempering area. For example, magnetic scales are installed on multiple hydraulic cylinders in the roll gap control system, and the magnetic scale can be used to calibrate the stroke of each hydraulic cylinder. When the roll needs to be changed or the hot roll is carried out, the position of the roll will change, and the telescopic position of the corresponding hydraulic cylinder needs to be recalibrated through the magnetic scale. The piston of the hydraulic cylinder is coaxially and fixedly connected to the connecting rod of the magnetic scale. The connecting rod can slide through the fixed protective cover of the magnetic scale. One end of the connecting rod is fixedly connected to one end of a spring, and the other end of the spring abuts against the bottom of the protective cover. During the calibration process, when the piston of the hydraulic cylinder retracts, it drives the connecting rod of the magnetic scale to move upward and compresses the spring. When the connecting rod of the magnetic scale moves downward, it is pushed back by the elastic force of the spring to complete the distance calibration.

[0003] Currently, for hydraulic cylinders that have been used for a long time, the spring is likely to lose its elasticity and cannot drive the connecting rod of the magnetic scale to move downward, which affects the distance calibration. At this time, it is necessary to remove the protective cover outside the connecting rod of the magnetic scale, the connecting rod inside the protective cover, and the bottom end cover that the spring cooperates with to replace the spring, and then reinstall the removed structure, and finally complete the calibration. This method requires a spare good spring, and the overall calibration time-consuming after disassembly and assembly will affect the production efficiency of the cold rolling production line. Utility Model Content

[0004] This application aims to at least solve the technical problem that the production efficiency of the cold rolling production line is affected to a certain extent. For this reason, this application provides an auxiliary calibration tooling.

[0005] The embodiment of this application provides an auxiliary calibration tooling, which is applied to push the connecting rod of the magnetic scale into the protective cover of the magnetic scale, and includes:

[0006] A support member, provided with an abutting end and a connecting portion surrounding the abutting end, and the abutting end is used to abut against the top of the protective cover;

[0007] A rotating tube, the peripheral wall of which is rotatably connected to the connecting portion, and both ends are located on both sides of the connecting portion;

[0008] A pressing member, detachably connected to one end of the rotating tube and used to abut against the connecting rod.

[0009] In some embodiments, the auxiliary calibration tooling further includes:

[0010] A connecting piece passes through the connecting portion and the rotating pipe, is in threaded fit with the connecting portion, in clearance fit with the rotating pipe, and has an extending end extending out of the rotating pipe;

[0011] A nut is in threaded connection with the extending end.

[0012] In some embodiments, the connecting piece further has an anti - detachment end extending out of the connecting portion. The rotating pipe and the connecting portion are located between the anti - detachment end and the extending end, and the anti - detachment end is used to abut against the connecting portion.

[0013] In some embodiments, the rotating pipe has at least two through - holes spaced along its axial direction, and one of the through - holes is in cooperation with the connecting piece.

[0014] In some embodiments, the distances between the two ends of the rotating pipe and the connecting portion are different.

[0015] In some embodiments, the pressing piece has an arc - shaped through - slot for cooperating with the peripheral wall of the connecting rod.

[0016] In some embodiments, the pressing piece includes an abutting portion with a sector - ring cross - section, and the inner wall of the abutting portion is configured as the arc - shaped through - slot.

[0017] In some embodiments, the auxiliary calibration tooling further includes:

[0018] An adjusting bolt, the rod portion of which axially passes through the pressing piece along the rotating pipe and is in threaded fit with the rotating pipe, and the nut portion of the adjusting bolt is embedded in the pressing piece.

[0019] In some embodiments, the rod portion is in clearance fit with the pressing piece, and the auxiliary calibration tooling further includes an elastic member sleeved on the rod portion and located between the pressing piece and the rotating pipe.

[0020] In some embodiments, the pressing piece is cylindrical and has an elliptical - ring cross - section. One end of the pressing piece is configured as the abutting end, and the outer peripheral wall of the pressing piece is configured as the connecting portion.

[0021] Beneficial effects provided by one or more embodiments of the present application:

[0022] When there is a problem with the spring of the magnetic scale, the protective cover of the magnetic scale can be opened. Hold the rotating tube of the auxiliary calibration tooling and send one end of the rotating tube and the support member connected to the rotating tube into the protective cover. The connecting part of the peripheral wall of the rotating tube is rotatably connected to the connecting part of the support member. The connecting part of the support member surrounds the abutting end of the support member. By adjusting the position of the rotating tube, the position of the support member can be adjusted accordingly. Adjust until the abutting end of the support member abuts against the top of the protective cover, and the two ends of the rotating tube are respectively located on both sides of the connecting part. Then, the two ends of the rotating tube can use the support member supported by the protective cover as a fulcrum to play a lever role. Make the pressing member detachably connected to one end of the rotating tube abut against the connecting rod of the magnetic scale inside the protective cover. Hold the other end of the rotating tube and apply a force to the other end of the rotating tube. The rotating tube uses the connecting part of the support member as a fulcrum, making the end abutting against the connecting rod rotate and push the connecting rod downward to complete the calibration. The efficiency is high and the time consumption is short. After the calibration is completed, normal production can be carried out, reducing the downtime of the cold rolling production line, which is beneficial to ensuring the production efficiency of the cold rolling production line. Moreover, the pressing member is detachably connected to one end of the rotating tube, and the rotating tube and the pressing member can also be disassembled, so that the rotating tube directly pushes the connecting rod through the end to be applicable to the calibration of hydraulic cylinders of different specifications in the same production line, and can also ensure the normal production of the cold rolling production line, and solve the technical problem that the production efficiency of the cold rolling production line is affected to a certain extent. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following will briefly introduce the drawings required for the description of the embodiments. Obviously, the drawings in the following description are some embodiments of the present application. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0024] Figure 1 FIG. shows a partial structural schematic diagram of a magnetic scale in some embodiments or certain embodiments of the present application.

[0025] Figure 2 FIG. shows a simplified diagram of the application situation of an auxiliary calibration tooling in some embodiments or certain embodiments of the present application.

[0026] Figure 3 FIG. shows a structural schematic diagram of an auxiliary calibration tooling in some embodiments or certain embodiments of the present application.

[0027] Figure 4 FIG. shows a partial structural schematic diagram of an auxiliary calibration tooling in some embodiments or certain embodiments of the present application.

[0028] Figure 5 FIG. shows a top view of an auxiliary calibration tooling in some embodiments or certain embodiments of the present application.

[0029] Explanation of the accompanying drawings: 1. Support member; 11. Abutment end; 12. Connecting portion; 2. Rotating tube; 21. Through hole; 3. Pressing member; 31. Arc-shaped through groove; 32. Abutment portion; 33. Embedded groove; 4. Connecting member; 41. Protruding end; 42. Anti-slip end; 5. Nut; 6. Elastic member; 100. Protective cover; 1001. Top; 1002. End cover; 200. Mounting layer; 300. Pull rod; 400. Spring. DETAILED DESCRIPTION

[0030] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0031] It should be noted that all directional indications in the embodiments of the present invention are only used to explain the relative position relationship, movement status, etc. between the various components in a certain specific posture. If the specific posture changes, the directional indication will also change accordingly.

[0032] In this utility model, unless otherwise specified or limited, the terms "connection" and "fixation" should be understood in a broad sense. For example, "fixation" can mean fixed connection, detachable connection, or integration; mechanical connection or electrical connection; direct connection or indirect connection through an intermediate medium; internal communication between two elements or interaction between two elements, unless otherwise specified. For those skilled in the art, the specific meanings of the above terms in this utility model can be understood according to specific circumstances.

[0033] In addition, in this utility model, the descriptions of "first" and "second" are for descriptive purposes only and should not be understood as indicating or implying their relative importance or implicitly indicating the number of the technical features indicated. Therefore, the features specified as "first" and "second" may explicitly or implicitly include at least one of such features. In addition, the technical solutions between the various embodiments can be combined with each other, but this must be based on the fact that they can be implemented by ordinary technicians in this field. When the combination of technical solutions is mutually contradictory or cannot be implemented, it should be deemed that such combination of technical solutions does not exist and is not within the scope of protection required by this utility model.

[0034] The present application will be described below with reference to the accompanying drawings:

[0035] For ease of understanding, here is provided Figure 1 , to illustrate the local structure of the magnetic scale. Figure 1Shows a partial structural schematic diagram of a magnetic scale in some embodiments or certain embodiments of the present application. Refer to Figure 1 As can be seen, the protective cover 100 of the magnetic scale can be fixed to the ground or a fixedly positioned mounting layer 200. The pull rod 300 of the magnetic scale can movably pass through the protective cover 100. One end of the spring 400 is fixed to the pull rod 300, and the other end of the spring 400 abuts against the bottom end cover 1002 of the protective cover 100. The other end of the spring 400 is the free end of the spring 400. The movement of the pull rod 300 will drive the spring 400, and finally it can be reset by the spring 400.

[0036] Figure 2 Shows a simplified diagram of the application situation of an auxiliary calibration tooling in some embodiments or certain embodiments of the present application. Figure 3 Shows a structural schematic diagram of an auxiliary calibration tooling in some embodiments or certain embodiments of the present application. Refer to Figure 2 And Figure 3 , embodiments of the present application provide an auxiliary calibration tooling, which is applied to a connecting rod that extends into the protective cover 100 of the magnetic scale and pushes the magnetic scale, and includes:

[0037] A support member 1, provided with an abutting end 11 and a connecting portion 12 surrounding the abutting end 11. The abutting end 11 is used to abut against the top 1001 of the protective cover 100.

[0038] A rotating tube 2, the peripheral wall of which is rotatably connected to the connecting portion 12, and both ends are located on both sides of the connecting portion 12 respectively.

[0039] A pressing member 3, which is detachably connected to one end of the rotating tube 2 and is used to abut against the connecting rod.

[0040] When there is a problem with the spring 400 of the magnetic scale, the protective cover 100 of the magnetic scale can be opened. Hold the rotating tube 2 of the auxiliary calibration tooling and send one end of the rotating tube 2 and the support member 1 connected to the rotating tube 2 into the protective cover 100. The connecting portion 12 of the circumferential wall of the rotating tube 2 is rotatably connected to the connecting portion 12 of the support member 1. The connecting portion 12 of the support member 1 surrounds the abutting end 11 of the support member 1. By adjusting the position of the rotating tube 2, the position of the support member 1 can be adjusted accordingly. Adjust until the abutting end 11 of the support member 1 abuts against the top 1001 of the protective cover 100, and the two ends of the rotating tube 2 are respectively located on both sides of the connecting portion 12. Then the two ends of the rotating tube 2 can use the support member 1 supported by the protective cover 100 as a fulcrum and play a lever role. Make the pressing member 3 detachably connected to one end of the rotating tube 2 abut against the connecting rod of the magnetic scale in the protective cover 100. Hold the other end of the rotating tube 2 and apply a force to the other end of the rotating tube 2. The rotating tube 2 uses the connecting portion 12 of the support member 1 as a fulcrum, makes the end abutting against the connecting rod rotate and push the connecting rod downward to complete the calibration. The efficiency is high and the time consumption is short. Once the calibration is completed, normal production can be carried out, reducing the downtime of the cold rolling production line, which is beneficial to ensuring the production efficiency of the cold rolling production line. Moreover, the pressing member 3 is detachably connected to one end of the rotating tube 2, and the rotating tube 2 and the pressing member 3 can also be disassembled, so that the rotating tube 2 directly pushes the connecting rod through the end to be applicable to the calibration of hydraulic cylinders of different specifications in the same production line, and can also ensure the normal production of the cold rolling production line, solving the technical problem that the production efficiency of the cold rolling production line is affected to a certain extent.

[0041] Moreover, since the factory where the cold rolling production line is located may not necessarily have a spare spring 400, and the unified collection of the spring 400 takes a long time, the calibration auxiliary tooling can also play a certain emergency role, avoiding the occurrence of a long-term shutdown problem caused by the inability to complete the calibration of the magnetic scale and the hydraulic cylinder, which is also beneficial to the normal production of the cold rolling production line. In the cold rolling production line, the sizes of the magnetic scale and the connecting rod are relatively large, and it is difficult for pure manpower to push the connecting rod. Therefore, with the assistance of the calibration auxiliary tooling, the connecting rod can be pushed relatively quickly.

[0042] It should be noted that in the cold rolling production line, the moving distance of the connecting rod in the magnetic scale is detected by a corresponding sensor and transmitted to the controller for display, and compared with the calibrated distance value to determine whether the calibration is completed. Therefore, the main impact of the failure of the spring 400 in the magnetic scale is on the moving process of the connecting rod. By using an auxiliary calibration tooling to move the pull rod 300 back to its original position, the moving distance of the pull rod 300 can be obtained normally, displayed, and calibrated, so the calibration process can be completed. The connecting rod of the magnetic scale has annular protrusions or shoulders in the axial direction, and these structures can be used to cooperate with the auxiliary calibration tooling to be pushed by the rotating tube 2. The calibration in this application can refer to the zero calibration of the roll gap controlled by the hydraulic cylinder by controlling the expansion and contraction of the hydraulic cylinder. Through calibration, the zero standards of rolling force, roll gap position, and roll gap inclination can be obtained. The magnetic scale in this application is a magnetostrictive displacement sensor, and the protective cover 100 of the magnetic scale usually has an opening and a door cover for opening and closing the opening. The time required for recalibration after replacing the spring 400 is several hours, while it only takes a few minutes to complete the calibration with the auxiliary calibration tooling, effectively ensuring the normal production of the cold rolling production line. A state of the usage process of the auxiliary calibration tooling can be referred to Figure 2 .

[0043] Figure 4 which shows a partial structural schematic diagram of an auxiliary calibration tooling in some embodiments or certain embodiments of this application. Referring to Figure 4 it can be seen that after disassembling the pressing part 3 at one end of the rotating tube 2, the corresponding end of the rotating tube 2 can also be used to push the connecting rods of different scales to move.

[0044] In some or certain embodiments, the auxiliary calibration tooling further includes:

[0045] A connecting piece 4, passing through the connecting part 12 and the rotating tube 2, threadedly mating with the connecting part 12, having a clearance fit with the rotating tube 2, and having an extending end 41 extending out of the rotating tube 2.

[0046] A nut 5, threadedly connecting with the extending end 41.

[0047] The connecting part 12 of the support piece 1 and the rotating tube 2 are cooperated through the connecting piece 4 and the nut 5. The connecting piece 4 passes through the connecting part 12 and the rotating tube 2, threadedly mating with the connecting part 12 and having a clearance fit with the rotating tube 2. There can be a certain mutual positioning effect between the connecting piece 4 and the support piece 1. The support piece 1 can be supported by the connecting piece 4, and the rotating tube 2 can also rotate relative to the support piece 1 with the connecting piece 4 as a fulcrum, so that the pressing part 3 can push the connecting rod to move along its own axial direction. According to requirements, the rotating tube 2 can also be pressed against the support piece 1 with the nut 5 to play a certain positioning role in the relative position between the support piece 1 and the rotating tube 2.

[0048] In some embodiments, the connecting member 4 further has an anti - detachment end 42 extending out of the connecting portion 12. The rotating tube 2 and the connecting portion 12 are located between the anti - detachment end 42 and the extending end 41, and the anti - detachment end 42 is used to abut against the connecting portion 12. The anti - detachment end 42 and the nut 5 cooperate to play a limiting role, improving the use stability of the auxiliary calibration tooling.

[0049] In some embodiments, the connecting member 4 can be a bolt, and the support member 1 and the rotating tube 2 can be provided with threaded holes or through - holes 21 corresponding to the bolt rod portion. The structure is simple and easy to implement. The connecting member 4 can also be a non - standard part, and the anti - detachment end 42 can be set as a circular plate or a square plate, etc. The connecting member 4 can also be a stud and other structures. The end of the stud that cooperates with the support member 1 extending out of the support member 1 for a long distance can also play a certain anti - detachment effect.

[0050] In some embodiments, the rotating tube 2 is provided with at least two spaced - apart through - holes 21 along its own axis, and one through - hole 21 cooperates with the connecting member 4.

[0051] The rotating tube 2 is provided with at least two spaced - apart through - holes 21 along its own axis, and one of the through - holes 21 cooperates with the connecting member 4. The support member 1 is connected to the rotating tube 2 through the connecting member 4. Then, when the connecting member 4 is connected to different through - holes 21, the distance between the support member 1 and both ends of the rotating tube 2 can be adjusted, facilitating the adjustment of the auxiliary calibration tooling according to the sizes of the protective covers 100 and the connecting rods of different scales, and achieving effective and rapid pushing of the connecting rods.

[0052] In some embodiments, the distances between the two ends of the rotating tube 2 and the connecting portion 12 are different. The pressing member 3 can be connected to the end with a smaller distance between the rotating tube 2 and the connecting portion 12, and the end with a larger distance between the rotating tube 2 and the connecting portion 12 can be held by hand, which is convenient for applying force and has a better pushing effect.

[0053] In some embodiments, the pressing member 3 is provided with an arc - shaped through - groove 31 for cooperating with the peripheral wall of the connecting rod. The arc - shaped through - groove 31 can fit on the peripheral wall of the connection, and then push the annular protrusion or shoulder, etc. on the connecting rod itself, and the speed of completing the pushing calibration is relatively fast, which is beneficial to ensuring the normal operation of the cold rolling production line.

[0054] In some embodiments, the pressing member 3 includes an abutting portion 32 with a sector - ring cross - section, and the inner wall of the abutting portion 32 is configured as the arc - shaped through - groove 31. The structure is compact, easy to prepare, and also convenient for pushing the connecting rod.

[0055] In some embodiments, the pressing member 3 has a sector - ring cross - section. The outer wall of the pressing member 3 can be connected to one end of the rotating tube 2, and the inner wall and the outer wall of the abutting portion 32 are respectively arc - shaped walls corresponding to the inner diameter and the outer diameter of the abutting portion 32.

[0056] In some embodiments, the pressing member 3 may also be of other structures such as a block or a special-shaped structure. The pressing member 3 and the rotating tube 2 can be connected by a threaded connection or by fasteners, both of which can achieve a detachable connection between the pressing member 3 and the rotating tube 2.

[0057] In some embodiments, the auxiliary calibration tooling further includes:

[0058] An adjusting bolt (not shown in the figure), the rod portion of which axially passes through the pressing member 3 along the rotating tube 2 and is in threaded cooperation with the rotating tube 2, and the nut portion of the adjusting bolt is embedded in the pressing member 3.

[0059] The addition of the adjusting bolt embedded in the pressing member 3 facilitates the adjustment of the distance between the pressing member 3 and the rotating tube 2 to be applicable to the protective covers 100 and connecting rods of magnetic scales of different scales.

[0060] In some embodiments, the rod portion has a clearance fit with the pressing member 3, and the auxiliary calibration tooling further includes an elastic member 6 sleeved on the rod portion and located between the pressing member 3 and the rotating tube 2. The elastic member 6 can ensure that the distance between the pressing member 3 and the rotating tube 2 is relatively stable.

[0061] Figure 5 Fig. shows a top view of an auxiliary calibration tooling in some embodiments or certain embodiments of the present application. Refer to Figure 5 , in some embodiments, the elastic member 6 can be a helical tension spring or can be, for example, a rubber ring. The pressing member 3 can be provided with an embedding groove 33 corresponding to the adjusting bolt.

[0062] In some embodiments, the pressing member 3 is cylindrical and has an elliptical annular cross-section. One end of the pressing member 3 is configured as an abutting end 11, and the outer peripheral wall of the pressing member 3 is configured as a connecting portion 12.

[0063] The pressing member 3 is cylindrical and has an elliptical annular cross-section. One end of the pressing member 3 is configured as an abutting end 11 while the outer peripheral wall is configured as an understanding portion, which is relatively light and convenient to operate, and the elliptical annular shape is also convenient for positioning. Cooperating with the rotating tube 2, the whole is convenient to operate and is also beneficial to the rapid calibration of the magnetic scale.

[0064] In the description of this specification, the description referring to terms such as "one embodiment", "some embodiments", "example", "specific example", or "some examples" means that the specific features, structures, materials, or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present application. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described can be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art can combine and combine the different embodiments or examples described in this specification.

[0065] In addition, the technical solutions between various embodiments may be combined with each other, provided that they can be implemented by those of ordinary skill in the art. When the combination of technical solutions results in contradictions or impossibilities, such a combination of technical solutions shall be considered non-existent and not within the scope of protection claimed in this application.

[0066] Although the embodiments of the present application have been shown and described, those of ordinary skill in the art can understand that various changes, modifications, substitutions, and variations can be made to these embodiments without departing from the principles and spirit of the present application. The scope of the present application is defined by the claims and their equivalents.

Claims

1. An auxiliary calibration tool, characterized in that: A connecting rod extending into the protective cover of the magnetic scale to push the magnetic scale comprises: a support member, comprising an abutting end and a connecting portion surrounding the abutting end, wherein the abutting end is used to abut against the top of the protective cover; A rotating tube, the peripheral wall of which is rotatably connected to the connecting portion, and the two ends of which are respectively located on both sides of the connecting portion; A pressing piece is detachably connected to one end of the rotating tube and is used to abut against the connecting rod.

2. The auxiliary calibration tool according to claim 1, characterized in that: The auxiliary calibration tool also includes: a connecting piece passing through the connecting portion and the rotating tube, being threadably engaged with the connecting portion and clearance-engaged with the rotating tube, and having an extending end extending out of the rotating tube; A nut is threadedly connected to the protruding end.

3. The auxiliary calibration tool according to claim 2, characterized in that: The connecting piece is further provided with an anti-slip end extending from the connecting portion, the rotating tube and the connecting portion are located between the anti-slip end and the extending end, and the anti-slip end is used to abut against the connecting portion.

4. The auxiliary calibration tool according to claim 2, characterized in that: The rotating tube is provided with at least two spaced through holes along its axial direction, and one of the through holes is matched with the connecting piece.

5. The auxiliary calibration tool according to any one of claims 1 to 4, characterized in that: The distances between the two ends of the rotating tube and the connecting portion are different.

6. The auxiliary calibration tool according to any one of claims 1 to 4, characterized in that: The pressing piece is provided with an arc-shaped through groove for cooperating with the peripheral wall of the connecting rod.

7. The auxiliary calibration tool according to claim 6, characterized in that: The pressing member includes an abutment portion with a cross section being a sector ring, and an inner wall of the abutment portion is configured as the arc-shaped through groove.

8. The auxiliary calibration tool according to any one of claims 1 to 4, characterized in that: The auxiliary calibration tool also includes: The adjusting bolt has a rod portion that passes through the pressing piece along the axial direction of the rotating tube and is threadably engaged with the rotating tube, and a nut portion of the adjusting bolt is embedded in the pressing piece.

9. The auxiliary calibration tool according to claim 8, characterized in that: The rod portion is loosely matched with the pressing member, and the auxiliary calibration tool further includes an elastic member sleeved on the rod portion and located between the pressing member and the rotating tube.

10. The auxiliary calibration tool according to any one of claims 1 to 4, characterized in that: The pressing member is cylindrical and has an elliptical ring cross section. One end of the pressing member is configured as the abutting end, and an outer peripheral wall of the pressing member is configured as the connecting portion.

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