A flexible caliper

Abstract

The application discloses a flexible caliper, relates to the technical field of measuring instruments, and comprises a universal rail and a plurality of calipers, wherein the universal rail is provided with an observation structure for observing the bending direction of the universal rail, the calipers are movably arranged on the universal rail, the moving direction of the calipers is perpendicular to the tangent direction of the bending part of the universal rail corresponding to the calipers, and the calipers are uniformly provided with a plurality of first scale lines along the length direction of the calipers. The application has the effect of improving the universality of the caliper.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of measuring instruments, in particular to a flexible caliper. BACKGROUND

[0002] The sheet metal part of the automobile generally refers to the metal shell of the automobile, which is usually made of steel plate. On the basis of ensuring a certain strength, the basic requirement for it is to reduce the weight as much as possible. In addition to the protection and aesthetic effect, the sheet metal part of the automobile is also the main carrier of the automobile to bear the gas resistance.

[0003] After the sheet metal part of the automobile is formed, the sheet metal part needs to be measured to check whether the forming effect of the sheet metal part is consistent with the design drawing. At present, in order to realize rapid detection of the outer surface of the sheet metal part, an arc-shaped caliper that is adapted to the qualified sheet metal part is usually made in advance according to the design requirements, and then the arc-shaped caliper is used to detect and check the sheet metal parts produced subsequently one by one.

[0004] In view of the related art, the size specification of the sheet metal part of the automobile is large, the curvature of different parts of a single vehicle model is different, and the versatility of a single arc-shaped caliper is low. Therefore, when the sheet metal part of the automobile is detected, multiple different arc-shaped calipers need to be used to detect and check the different curvatures of the automobile one by one, which is a large amount of work and time-consuming. SUMMARY

[0005] In order to improve the problem of low versatility of the arc-shaped caliper, the present application provides a flexible caliper.

[0006] The flexible caliper provided by the present application adopts the following technical scheme:

[0007] A flexible caliper comprises a universal rail and a plurality of calipers, the universal rail is provided with an observation structure for observing the bending direction of the universal rail, the calipers are movably arranged on the universal rail, the moving direction of the calipers is perpendicular to the tangent direction of the bending part of the universal rail corresponding to the calipers, and the calipers are uniformly provided with a plurality of first scale lines along the length direction of the calipers.

[0008] By adopting the above technical scheme, since the universal rail can swing in any direction and the clamping pin can slide along the direction perpendicular to the tangent of the bending part of the corresponding universal rail, the universal rail and / or the position of the clamping pin on the universal rail can be first rotated to make the plurality of clamping pins stably abut on the corresponding part of the sheet metal part model; at this time, the bending swing condition of the universal rail is recorded by observing the structure, and the relative position condition of the clamping pin and the universal rail is recorded by the first scale line, thereby realizing the measurement and recording of the radius of each part of the sheet metal part model, and improving the versatility of the flexible caliper. When the sheet metal part is mass-produced, the bending degree of the universal rail and the position of the clamping pin can be adjusted according to the recorded measurement data, and then the flexible caliper is abutted on the detection part of the sheet metal part, and whether the sheet metal part is a qualified product is judged by observing whether the plurality of clamping pins are tightly abutted on the sheet metal part.

[0009] Optionally, the universal rail comprises a plurality of rotating cylinders, and the end portions of two adjacent rotating cylinders are connected by a spherical hinge, and the clamping pin is vertically arranged on the rotating cylinder.

[0010] By adopting the above technical scheme, the plurality of rotating cylinders are mutually connected by spherical hinges, so that one of the rotating cylinders can rotate and deflect around the end portion of the adjacent rotating cylinder, so that the universal rail composed of the plurality of rotating cylinders connected by spherical hinges can rotate and deflect in any direction in space, and thus the detection of the bending condition of each part of the sheet metal part model can be completed by only one flexible caliper, thereby improving the versatility of the flexible caliper.

[0011] Optionally, the universal rail further comprises a connecting cylinder located at the end portion of the rotating cylinder, a connecting rod located between two adjacent rotating cylinders, and a spherical head fixedly installed on the two ends of the connecting rod, the connecting cylinder is coaxially fixedly connected with the rotating cylinder, the spherical head penetrates the connecting cylinder and is located in the rotating cylinder, and the connecting rod is connected to the connecting cylinder by the spherical head, and there is a gap between two adjacent connecting cylinders.

[0012] By adopting the above technical scheme, the connecting cylinder is fixedly installed at the end portion of the rotating cylinder, and the connecting rod is connected to the connecting cylinder by the spherical head, so that the two adjacent rotating cylinders can rotate and deflect in any direction around the end portion of the connecting rod. And there is a gap between two adjacent connecting cylinders, so that a large angle deflection can be generated between two adjacent rotating cylinders, thereby further improving the versatility of the flexible caliper.

[0013] Optionally, the observation structure comprises a plurality of second scale lines uniformly arranged on the circular arc peripheral wall of the connecting cylinder and a plurality of circular ring lines located on the spherical head, the second scale line is located at the end of the connecting cylinder away from the rotating cylinder, and the center of the circular ring line is located on the extension line of the central axis of the connecting rod.

[0014] By adopting the technical scheme, when the two adjacent rotating cylinders are coaxially rotated, the size of the dihedral angle between the two adjacent clamping pins can be determined by observing the alignment of the second scale lines on the two adjacent connecting cylinders. When one rotating cylinder is rotated around the other rotating cylinder, the size of the included angle between the two rotating cylinders, and thus the size of the included angle between the two clamping pins, can be determined by observing the alignment of the circular line on the ball head and the inner wall of the connecting cylinder. The relative positions between the two clamping pins can be displayed through the second scale lines, the circular line and the first scale lines, which not only helps to quickly complete the data acquisition of the sheet metal part model, but also quickly adjusts the flexible caliper to the appropriate shape, thereby completing the rapid checking and detection of the sheet metal part.

[0015] Optionally, the ball head is provided with a limiting structure for limiting the free rotation of the rotating cylinder on the connecting rod.

[0016] By adopting the technical scheme, the limiting structure can limit the free rotation and deflection between the two adjacent rotating cylinders, so that the bending trajectory of the universal rail remains stable under the action of no external force after the bending condition of the universal rail is adjusted, thereby facilitating the rapid detection of the sheet metal part by using the flexible caliper.

[0017] Optionally, a connecting block is slidably connected to the circumferential wall of the rotating cylinder, the connecting block is slidably installed on the rotating cylinder along the length direction of the rotating cylinder, the clamping pin is slidably connected to the connecting block along the radial direction of the rotating cylinder, and a plurality of third scale lines are uniformly arranged on the rotating cylinder along the length direction of the rotating cylinder.

[0018] By adopting the technical scheme, the clamping pin is slidably connected to the rotating cylinder through the connecting block, and the position of the clamping pin on the rotating cylinder can be adjusted, so that the clamping pin can quickly abut against the detection point of the sheet metal part according to the detection needs. The bending condition of the universal rail and the relative positions between the plurality of clamping pins can be quickly adjusted according to the design requirements through the first scale line, the second scale line, the third scale line and the circular line, thereby completing the rapid measurement of the radii of the sheet metal part model.

[0019] Optionally, the connecting block is provided with a stable structure for limiting the free sliding of the clamping pin on the rotating cylinder.

[0020] By adopting the technical scheme, the stable structure limits the free sliding of the clamping pin on the rotating cylinder, so that the clamping pin can be stably positioned on the rotating cylinder under the action of no external force, thereby facilitating the stable abutment of the clamping pin with the position adjusted on the sheet metal part, and completing the rapid inspection of the sheet metal part.

[0021] Optionally, the universal rail is provided with two groups, and the clamping pin is slidably installed on the two groups of universal rails.

[0022] By adopting the technical scheme, the clamping pin is installed on the two groups of universal rails, so that after the position of the clamping pin is adjusted, the clamping pin is not prone to slipping relative to the universal rails under the support of the two groups of universal rails, and the clamping pin is more stably abutted on the sheet metal part for detection.

[0023] Optionally, the clamping pin is detachably installed on the connecting block.

[0024] By adopting the technical scheme, the clamping pin is detachably installed on the connecting block, and one group of universal rails can be removed from the clamping pin, so that the adjacent two clamping pins are adjusted at a large angle, and the versatility of the flexible caliper is further improved.

[0025] Optionally, the clamping pin is provided with a bubble gauge, and the length direction of the bubble gauge is consistent with the length direction of the clamping pin.

[0026] By adopting the technical scheme, the bubble gauge is provided, so that the position of the bubble in the bubble gauge is observed, the clamping pin of the flexible caliper is abutted on the sheet metal part at a set angle, the error caused by the included angle between the clamping pin and the sheet metal part is avoided as much as possible, and the accurate detection of the sheet metal part is realized.

[0027] In summary, the present application has at least one of the following beneficial technical effects:

[0028] 1. The universal rail and / or the position of the clamping pin on the universal rail are first rotated, so that the plurality of clamping pins are stably abutted on the corresponding parts of the sheet metal part; at this time, the bending direction of the universal rail is recorded by observing the structure, and the relative position of the clamping pin and the universal rail is recorded by the first scale, so that the measurement and recording of the curvature of each part of the sheet metal part model are realized. After batch production of the sheet metal part, the bending degree of the universal rail and the position of the clamping pin can be adjusted according to the recorded measurement data, and then the flexible caliper is abutted on the detection part of the sheet metal part, so that whether the sheet metal part is a qualified product is judged by observing whether the plurality of clamping pins are tightly abutted on the sheet metal part.

[0029] 2. The clamping pin is detachably installed on the connecting block, one group of universal rails can be removed from the clamping pin, the plurality of rotating cylinders on the same group of universal rails are rotated, so that the corresponding clamping pins are rotated, the adjacent two clamping pins are adjusted at a large angle, and the versatility of the flexible caliper is further improved.

[0030] 3. The position of the bubble in the bubble gauge is observed, the clamping pin of the flexible caliper is abutted on the sheet metal part at a set angle, the error caused by the included angle between the clamping pin and the sheet metal part is avoided as much as possible, and the accurate detection of the sheet metal part is realized. BRIEF DESCRIPTION OF DRAWINGS

[0031] Figure 1 is a schematic diagram of the overall structure of an embodiment of the present application.

[0032] Figure 2 is a schematic diagram of the structure of a card needle, a rotating cylinder, a connecting cylinder and a bubble gauge in an embodiment of the present application.

[0033] Figure 3 is a schematic diagram of the sectional structure of a universal rail in an embodiment of the present application, mainly used to show a connecting rod, a ball head and an observation structure.

[0034] Reference signs: 1, card needle; 2, universal rail; 21, rotating cylinder; 22, connecting cylinder; 23, connecting rod; 24, ball head; 3, observation structure; 31, second scale line; 32, circular ring line; 4, first scale line; 5, limiting structure; 6, connecting block; 7, third scale line; 8, stabilizing structure; 9, bubble gauge; 10, first sliding groove; 11, second sliding groove. DETAILED DESCRIPTION

[0035] The following will be described in detail in combination with the accompanying Figures 1-3 The present application will be described in further detail.

[0036] An embodiment of the present application discloses a flexible caliper.

[0037] With reference to Figure 1 and Figure 2 A flexible caliper comprises a universal rail 2 and a plurality of card needles 1, the universal rail 2 can be deflected in any direction, and the universal rail 2 is provided with an observation structure 3 for observing the degree of deflection of the universal rail 2; the plurality of card needles 1 are arranged along the length direction of the universal rail 2, and the length direction of the card needle 1 is perpendicular to the tangent direction of the curved part of the universal rail 2 corresponding to the card needle 1. The card needle 1 is movably arranged on the universal rail 2, in order to make the movement of the card needle 1 more stable, the universal rail 2 is provided with two groups, the two groups of universal rails 2 are arranged along the length direction of the card needle 1, and the card needle 1 can slide along the curved direction of the universal rail 2 or along the tangent direction perpendicular to the curved part of the universal rail 2 on the two groups of universal rails 2. In order to facilitate quick recording of the position of the card needle 1 relative to the universal rail 2, a plurality of first scale lines 4 are uniformly arranged along the length direction of the card needle 1, and a plurality of third scale lines 7 are arranged along the length direction of the universal rail 2.

[0038] When the flexible caliper is used to detect a sheet metal part, the universal rail 2 and / or the position of the card needle 1 on the universal rail 2 can be first rotated, so that the end portions of the plurality of card needles 1 are stably abutted on the corresponding parts of the sheet metal part model; at this time, the deflection direction of the universal rail 2 is recorded through the observation structure 3, and the relative position of the card needle 1 and the universal rail 2 is recorded through the first scale line 4 and the third scale line 7, thereby realizing the measurement and recording of the radii of each part of the sheet metal part model.

[0039] Subsequently, the bending degree of the universal rail 2 and the position of the clamping pins 1 can be adjusted according to the record of the measurement data, and then the flexible caliper is abutted against the detection part of the sheet metal part, and whether the sheet metal part is a qualified product is judged by observing whether the plurality of clamping pins 1 are tightly abutted against the sheet metal part.

[0040] To realize the effect that the universal rail 2 can be deflected in any direction, the universal rail 2 can be a corrugated pipe, also can be a rubber pipe, and also can be connected by a plurality of independent single unit ball hinges. Referring to Figure 2 and Figure 3 In the embodiment of the application, the universal rail 2 includes a plurality of rotating cylinders 21, and the end portions of adjacent two rotating cylinders 21 are connected by a ball hinge.

[0041] In other embodiments, a spherical head is coaxially welded at one end of the rotating cylinder 21, and a spherical cover is coaxially welded at the other end of the rotating cylinder 21, and the spherical cover of one rotating cylinder 21 is arranged on the spherical head of the other rotating cylinder 21, so as to realize the ball hinge between the adjacent two rotating cylinders 21.

[0042] To enable a larger range of rotational deflection between the adjacent two rotating cylinders 21, referring to Figure 2 and Figure 3 In the embodiment of the application, the universal rail 2 further includes a connecting cylinder 22 located at the end portion of the rotating cylinder 21, a connecting rod 23 located between the adjacent two rotating cylinders 21, and a ball head 24 fixedly installed on both ends of the connecting rod 23. Each rotating cylinder 21 corresponds to two connecting cylinders 22, and the two connecting cylinders 22 are respectively located at the two end portions of the rotating cylinder 21 and are coaxially welded and fixed to the end portions of the rotating cylinder 21. The connecting rod 23 is located between the adjacent two rotating cylinders 21, a center hole is provided through the connecting cylinder 22, the inner wall of the center hole is in an arc shape, the ball head 24 is arranged through the connecting cylinder 22, the inner wall of the connecting cylinder 22 is rotationally attached to the ball head 24, the center of the ball head 24 is located in the center hole of the connecting cylinder 22, and the ball head 24 is partially located in the rotating cylinder 21 and partially located outside the rotating cylinder 21. At this time, the connecting rod 23 is ball-hinged to the connecting cylinder 22 through the ball head 24, and there is a gap between the adjacent two connecting cylinders 22, so that the adjacent two rotating cylinders 21 can produce a larger range of rotational deflection on the connecting rod 23.

[0043] To enable the universal rail 2 to stably present the adjusted bending degree without external force, referring to Figure 2 and Figure 3The ball head 24 is provided with a limiting structure 5 for limiting the free rotation of the rotating cylinder 21 on the connecting rod 23. The limiting structure 5 can be a sanding layer arranged on the surface of the ball head 24, or a damping pad coated on the surface of the ball head 24, or a rubber layer coated on the surface of the ball head 24. In the embodiment of the application, the limiting structure 5 is a damping pad which is stably bonded to the surface of the ball head 24 by waterproof glue. The inner wall of the central hole of the connecting cylinder 22 abuts against the damping pad. When it is necessary to adjust the relative position between two adjacent rotating cylinders 21, only the resistance of the damping pad needs to be overcome to drive the rotating cylinder 21 to rotate the connecting cylinder 22 around the end of the connecting rod 23.

[0044] In order to quickly observe the bending direction of the universal rail 2 or quickly adjust the bending degree of the universal rail 2 according to the design parameters, with reference to Figure 2 and Figure 3 The observation structure 3 includes a plurality of second scale lines 31 uniformly arranged on the circular arc peripheral wall of the connecting cylinder 22 and a plurality of circular ring lines 32 located on the ball head 24. The second scale lines 31 are located at the end of the connecting cylinder 22 away from the rotating cylinder 21, and the circular ring lines 32 are located on the damping pad, and the centers of the plurality of circular ring lines 32 are located on the extension line of the central axis of the connecting rod 23.

[0045] When it is necessary to adjust the bending direction of the clamp pin 1, it is only necessary to adjust the bending direction of the universal rail 2. The adjacent two rotating cylinders 21 can be first driven to rotate around the coaxial line of the connecting rod 23, and the size of the dihedral angle between the adjacent two clamp pins 1 can be judged by observing the alignment of the second scale lines 31 on the two adjacent connecting cylinders 22. Alternatively, the rotating cylinder 21 can be driven to rotate around the end of the connecting rod 23, and the size of the dihedral angle between the two rotating cylinders 21 can be judged by observing the alignment of the connecting cylinder 22 inner wall and the circular ring line 32 on the ball head 24, so as to judge the size of the dihedral angle between the two clamp pins 1. Then the clamp pin 1 is driven to slide on the rotating cylinder 21, the position of the clamp pin 1 on the rotating cylinder 21 is adjusted, so that the end of the clamp pin 1 abuts against the measured part of the sheet metal part; the relative position of the clamp pin 1 and the universal rail 2 is recorded by the first scale line 4 and the third scale line 7, so that only one flexible caliper can complete the detection and data collection of the bending conditions of each part of the sheet metal part model.

[0046] In order to enable the clamp pin 1 to stably slide on the rotating cylinder 21, with reference to Figure 2 and Figure 3 A T-shaped first sliding groove 10 is arranged on the peripheral wall of the rotating cylinder 21, the length direction of the first sliding groove 10 is consistent with the length direction of the rotating cylinder 21, the two ends of the first sliding groove 10 are closed, and a plurality of third scale lines 7 are uniformly arranged on one side of the first sliding groove 10 along the length direction of the first sliding groove 10. A connecting block 6 is slidably connected in the first sliding groove 10 on the rotating cylinder 21, and the connecting block 6 is slidably installed on the rotating cylinder 21 along the length direction of the rotating cylinder 21.

[0047] Referring to Figure 2 and Figure 3 , the second sliding groove 11 in the shape of T is formed on the clamping needle 1, the length direction of the second sliding groove 11 is consistent with the length direction of the clamping needle 1, and the length direction of the second sliding groove 11 is consistent with the width direction of the first sliding groove 10. The end of the connecting block 6 away from the rotating cylinder 21 is connected to the clamping needle 1 through the second sliding groove 11, and the two ends of the second sliding groove 11 are both open, so that the clamping needle 1 can be detachably installed on the connecting block 6. When the adjacent two clamping needles 1 need to be adjusted by a large angle, only one set of universal rails 2 is removed from the clamping needle 1, and the rotating cylinder 21 on the universal rail 2 is rotated, so that the clamping needle 1 is driven to rotate by a large angle.

[0048] In order to make the position of the clamping needle 1 relative to the rotating cylinder 21 stable without external force, and facilitate the clamping needle 1 to abut against the sheet metal part stably, referring to Figure 2 and Figure 3 , the connecting block 6 is provided with a stabilizing structure 8 for limiting the free sliding of the clamping needle 1 on the rotating cylinder 21. The stabilizing structure 8 can be a rubber layer wrapped on the connecting block 6, or a damping pad wrapped on the connecting block 6. In the embodiment of the application, the stabilizing structure 8 is a damping pad wrapped and bonded on the peripheral wall of the connecting block 6 by waterproof glue. The damping pad parts located at the two ends of the connecting block 6 abut against the inner walls of the first sliding groove 10 and the second sliding groove 11 respectively, so that the connecting block 6 is not easy to slide freely relative to the rotating cylinder 21, and the clamping needle 1 is not easy to slide freely relative to the connecting block 6.

[0049] In order to reduce the error of the flexible caliper in detecting the sheet metal part, referring to Figure 2 and Figure 3 , the clamping needle 1 is provided with a bubble instrument 9, the bubble instrument 9 is embedded on the side surface of the clamping needle 1 away from the universal rail 2, and the length direction of the bubble instrument 9 is consistent with the length direction of the clamping needle 1. By observing the position of the bubble in the bubble instrument 9, the clamping needle 1 can abut against the sheet metal part at a certain angle according to the design requirement.

[0050] The implementation principle of the flexible caliper in the embodiment of the application is as follows: first, connect two sets of universal rails 2 to a plurality of clamping needles 1 through a connecting block 6, then drive the rotating cylinder 21 to deflect or rotate on the connecting rod 23 according to the situation of the to-be-measured region of the sheet metal part model, so that the clamping needle 1 on the rotating cylinder 21 points to the to-be-measured region of the sheet metal part model, and at this time, record the bending direction of the universal rail 2 according to the second scale line 31 and the circular ring line 32.

[0051] Then, push the clamping needle 1 to slide on the rotating cylinder 21 along the length direction of the rotating cylinder 21, so that the clamping needle 1 approaches the to-be-measured point of the sheet metal part model, and at this time, record the position of the clamping needle 1 on the rotating cylinder 21 according to the third scale line 7.

[0052] Then push the card needle 1 to the sheet metal model direction movement, so that the card needle 1 is tightly in the sheet metal model, at this time according to the first scale line 4 and bubble instrument 9 record card needle 1 relative to the position of rotating cylinder 21 and the measured angle of sheet metal model.

[0053] Using the above manner, through a flexible caliper to standard sheet metal model each place data collection, can refer to the collected data to the production of sheet metal detection check. At this time can first according to the recorded parameters adjust the degree of bending of universal rail 2 and the position of card needle 1, then the flexible caliper is against in the sheet metal detection part, by observing whether the multiple card needle 1 is closely abutted on the sheet metal, thereby judging whether the sheet metal is a qualified product.

[0054] The above are the preferred embodiments of the present application, not limited by the protection scope of the present application, therefore: all equivalent changes made according to the structure, shape, principle of the present application should be covered within the protection scope of the present application.

Claims

1. A flexible caliper characterized by: The utility model provides a kind of universal rail (2) and multiple clamping pins (1), the universal rail (2) is provided with observation structure (3) for observing its bending swing direction degree, the clamping pin (1) is movably arranged on the universal rail (2), and the moving direction of the clamping pin (1) is perpendicular to the tangent direction of the bending part of the universal rail (2) corresponding to the clamping pin (1), the clamping pin (1) is uniformly provided with multiple first scale lines (4) along its length direction. The universal rail (2) includes multiple rotating cylinders (21), the end of adjacent two rotating cylinders (21) is connected by spherical hinge, and the clamping pin (1) is vertically arranged on the rotating cylinder (21); the universal rail (2) further includes a connecting cylinder (22) at the end of the rotating cylinder (21), a connecting rod (23) between adjacent two rotating cylinders (21) and a ball head (24) fixedly installed on both ends of the connecting rod (23), the connecting cylinder (22) is coaxially fixedly connected with the rotating cylinder (21), the ball head (24) penetrates the connecting cylinder (22) and is located in the rotating cylinder (21), and the connecting rod (23) is spherical hingedly connected to the connecting cylinder (22) through the ball head (24), and there is a gap between adjacent two connecting cylinders (22). The observation structure (3) includes multiple second scale lines (31) uniformly arranged on the circular arc peripheral wall of the connecting cylinder (22) and multiple circular ring lines (32) on the ball head (24), the second scale line (31) is located at one end of the connecting cylinder (22) away from the rotating cylinder (21), and the center of the circular ring line (32) is located on the extension line of the central axis of the connecting rod (23).

2. A flexible calliper according to claim 1, wherein: The ball head (24) is provided with a limiting structure (5) for limiting the free rotation of the rotating cylinder (21) on the connecting rod (23).

3. The flexible caliper of claim 1, wherein: The rotating cylinder (21) is slidably connected with a connecting block (6) on the peripheral wall, the connecting block (6) is slidably installed on the rotating cylinder (21) along the length direction of the rotating cylinder (21), the clamping pin (1) is slidably connected to the connecting block (6) along the radial direction of the rotating cylinder (21), and multiple third scale lines (7) are uniformly arranged on the rotating cylinder (21) along the length direction.

4. A flexible calliper according to claim 3, wherein: The connecting block (6) is provided with a stable structure (8) for limiting the free sliding of the clamping pin (1) on the rotating cylinder (21).

5. The flexible caliper of claim 3, wherein: The universal rail (2) is provided with two groups, and the clamping pin (1) is slidably installed on the two groups of universal rails (2).

6. A flexible calliper according to claim 5, wherein: The clamping pin (1) can be detachably installed on the connecting block (6).

7. The flexible caliper of claim 1, wherein: The clamping pin (1) is provided with a bubble instrument (9), and the length direction of the bubble instrument (9) is consistent with the length direction of the clamping pin (1).

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