A tool for detecting an arc-shaped tooth plate

Abstract

The application relates to a tool for detecting an arc-shaped tooth plate, which comprises a tooth plate fixing rack, a rotating detection assembly and a detection instrument assembly; the tooth plate fixing rack comprises left and right side plates arranged in parallel and at intervals and a crossbeam connected between the left and right side plates, and the crossbeam is used for mounting the arc-shaped tooth plate; the rotating detection assembly comprises a mandrel connected between the left and right side plates, a turnover swing arm rotatably connected to one end of the mandrel, and a gear rotatably connected to the other end of the turnover swing arm and meshed with the arc-shaped tooth plate; the detection instrument assembly comprises a dial gauge fixing seat mounted on the turnover swing arm and connected with a dial gauge for measuring the arc-shaped tooth plate through a universal folding support. The dial gauge fixing seat on the turnover swing arm is adjusted to contact the dial gauge with the arc-shaped tooth plate by adjusting the position and angle of the universal folding support, so that the tooth tip circle runout and the end surface runout of the arc-shaped tooth plate are detected, the detection efficiency is improved, and the detection cost is reduced.

Description

Technical Field

[0001] This application relates to the field of inspection tool technology, and in particular to a tooling for inspecting arc-shaped toothed plates. Background Technology

[0002] Due to their special shape and high precision requirements, sector gears present many challenges in our machining and inspection. In particular, during assembly, it is essential to ensure that the tooth arc can mesh correctly with the gear, and the perpendicularity of the tooth arc end face to the mandrel centerline must be 0.3, and the radial runout of the tooth tip circle relative to the trunnion centerline must be 0.3.

[0003] Initially, we used a coordinate measuring machine for measurement. However, due to the special requirements of the gear position accuracy, the measurement process was cumbersome, time-consuming, and required a high level of technical expertise from the inspectors, making it difficult to meet the needs of mass production. Summary of the Invention

[0004] This application provides a tooling for detecting arc-shaped gear plates, thereby solving the problem of cumbersome and time-consuming measurement processes for sector gears in related technologies.

[0005] This application provides a tooling for detecting arc-shaped toothed plates, comprising:

[0006] A toothed plate fixing frame includes a left side plate and a right side plate that are parallel to each other and spaced apart, and a crossbeam connecting the left side plate and the right side plate, the crossbeam being used to install the arc-shaped toothed plate;

[0007] A rotation detection assembly includes a spindle connected between the left side plate and the right side plate, a flipping swing arm rotatably connected to the spindle at one end, and a gear meshing with the arc-shaped toothed plate at the other end of the flipping swing arm via a rotating shaft.

[0008] The testing instrument assembly includes a dial indicator mounting base mounted on the tilting arm, the dial indicator mounting base being connected to a dial indicator for measuring the arc-shaped toothed plate via a universal folding bracket.

[0009] In some embodiments: one end of the left side plate and the right side plate are provided with mounting holes for inserting the mandrel, the crossbeam includes a front crossbeam and a rear crossbeam spaced apart from each other, the rear crossbeam is provided with a fixing seat for mounting the arc-shaped toothed plate, and the two ends of the rear crossbeam are respectively connected to the left side plate and the right side plate and are located at the end close to the mounting hole;

[0010] The arc-shaped toothed plate includes a sector plate, on which an arc-shaped rack that meshes with the gear is fixedly connected. The sector plate is provided with a mounting plate connected to the fixed seat, and the center of the arc-shaped rack is located on the axis of the spindle.

[0011] In some embodiments: the flipping swing arm includes two parallel and spaced-apart support arms, and an end plate connected between the two support arms, the arc-shaped toothed plate is located between the two support arms, and the rotating shaft is rotatably connected to the two support arms and located at one end close to the end plate;

[0012] The ends of the two support arms away from the end plate are connected to a clamp, and a bearing sleeve fitted on the outer periphery of the mandrel is clamped in the clamp. The bearing sleeve is provided with a first bearing coaxially connected to the mandrel.

[0013] In some embodiments: a shoulder is provided on the outer arm of the middle part of the mandrel, and two first bearings respectively located on both sides of the shoulder are sleeved on the mandrel. The inner holes at both ends of the bearing sleeve are provided with internal threads, and the internal threads of the bearing sleeve are connected to plugs that fix the first bearings in the bearing sleeve.

[0014] In some embodiments: the clamp includes an upper clamp and a lower clamp that are connected to each other, one end of the lower clamp is fixedly connected to the support arm, and the upper clamp and the lower clamp are connected by bolts to clamp the bearing sleeve.

[0015] In some embodiments: the outer wall of the plug is radially cut with a weakening groove, and the end face of the plug is axially provided with a fastening hole that penetrates the weakening groove, and a fastener is connected in the fastening hole.

[0016] In some embodiments: one end of the mandrel is connected to a left positioning flange that is adapted to the mounting hole of the left side plate, and the other end of the mandrel is connected to a right positioning flange that is adapted to the mounting hole of the right side plate;

[0017] The left positioning flange and the mandrel are coaxially plugged and plugged into each other, and a cotter pin is connected between the left positioning flange and the mandrel. The right positioning flange is fitted onto the end of the mandrel, and the end of the mandrel is provided with a pressure plate and screws for fixing the right positioning flange to the right side plate.

[0018] In some embodiments: the rotating shaft and the gear are connected by a flat key, and through holes for the rotating shaft are provided on the two support arms. The two ends of the rotating shaft are respectively provided with second bearings that are rotatably connected to the two support arms, and the second bearings are located in the through holes;

[0019] Both of the two support arms have end caps connected to their respective sidewalls that are far apart from each other. The end caps are fixed to the support arms by fasteners. The shaft is threaded with a nut that axially fixes the gear to the shaft.

[0020] In some embodiments, the end of the flip arm away from the spindle is connected to a handle that pushes the flip arm to rotate around the spindle.

[0021] In some embodiments: the dial indicator mounting base is attached to the flip arm by a permanent magnet, and the universal folding bracket includes a first connecting plate and a second connecting plate that are hinged to each other. The end of the first connecting plate away from the second connecting plate is connected to the dial indicator mounting base by a ball joint, and the end of the second connecting plate away from the first connecting plate is connected to the dial indicator.

[0022] The beneficial effects of the technical solution provided in this application include:

[0023] This application provides a tooling for detecting arc-shaped toothed plates. The tooling includes a toothed plate fixing frame comprising a left and right side plate arranged parallel to each other and spaced apart, and a crossbeam connected between the left and right side plates. The crossbeam is used to mount the arc-shaped toothed plate. A rotating detection assembly includes a spindle connected between the left and right side plates, a tilting arm rotatably connected at one end to the spindle, and a gear meshing with the arc-shaped toothed plate at the other end via a rotating shaft. A detection instrument assembly includes a dial indicator mounting base mounted on the tilting arm, and a dial indicator for measuring the arc-shaped toothed plate connected to the dial indicator mounting base via a universal folding bracket.

[0024] Therefore, the tooling used in this application for inspecting arc-shaped toothed plates utilizes a toothed plate fixing frame to fix the arc-shaped toothed plate at a designated inspection station. The toothed plate fixing frame includes a left side plate and a right side plate arranged parallel to each other and spaced apart, and a crossbeam connected between the left and right side plates for mounting the arc-shaped toothed plate. The rotary inspection assembly includes a mandrel connected between the left and right side plates, and a tilting arm rotatably connected to the mandrel at one end. The tilting arm drives a gear to reciprocate on the arc-shaped toothed plate around the mandrel. A dial indicator mounting base located on the tilting arm adjusts the position and angle of the universal folding bracket to adjust the contact between the dial indicator and the arc-shaped toothed plate, thereby detecting the tooth tip circle runout and end face runout of the arc-shaped toothed plate, improving inspection efficiency and reducing inspection costs. Attached Figure Description

[0025] To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0026] Figure 1 This is a three-dimensional structural view of an embodiment of this application;

[0027] Figure 2 This is a structural front view of an embodiment of this application;

[0028] Figure 3 This is a schematic diagram of the toothed plate fixing frame according to an embodiment of this application;

[0029] Figure 4 This is a schematic diagram of the arc-shaped toothed plate according to an embodiment of this application;

[0030] Figure 5 This is an exploded view of the structure of the rotation detection component according to an embodiment of this application;

[0031] Figure 6 This is a schematic diagram of the structure of the plug in an embodiment of this application.

[0032] Figure label:

[0033] 10. Tooth plate fixing frame; 11. Left side plate; 12. Right side plate; 13. Rear crossbeam; 14. Front crossbeam; 15. Mounting holes;

[0034] 20. Arc-shaped toothed plate; 21. Fan-shaped plate; 22. Circular arc toothed rack; 23. Mounting plate;

[0035] 30. Rotary detection assembly; 31. Spindle; 32. Tilting swing arm; 33. Gear; 34. Support arm; 35. End plate; 36. Clamp; 37. Bearing sleeve; 38. First bearing; 39. Plug;

[0036] 40. Testing instrument assembly; 41. Dial indicator mounting bracket; 42. Universal folding bracket; 43. Dial indicator; 44. Left positioning flange; 45. Right positioning flange; 46. Rotating shaft; 47. Second bearing; 48. End cap; 49. Nut;

[0037] 50. Handle. Detailed Implementation

[0038] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0039] This application provides a tooling for detecting arc-shaped gear plates, which can solve the problem of cumbersome and time-consuming measurement process of sector gears in related technologies.

[0040] See Figures 1 to 5 As shown in the figure, this application embodiment provides a tooling for detecting arc-shaped toothed plates, including:

[0041] The toothed plate fixing frame 10 includes a left side plate 11 and a right side plate 12 that are parallel to each other and spaced apart, and a crossbeam connecting the left side plate 11 and the right side plate 12. The crossbeam is used to install the arc-shaped toothed plate 20. The toothed plate fixing frame 10, which is formed by the interconnection of the left side plate 11, the right side plate 12 and the crossbeam, not only provides positioning support for detecting the arc-shaped toothed plate 20, but also provides positioning support for the rotation of the rotating detection assembly 30 relative to the arc-shaped toothed plate 20.

[0042] The rotary detection assembly 30 includes a spindle 31 connected between the left side plate 11 and the right side plate 12, a tilting arm 32 rotatably connected at one end to the spindle 31, and a gear 33 meshing with the arc-shaped toothed plate 20 connected at the other end via a rotating shaft 46. The tilting arm 32 drives the gear 33 meshing with the arc-shaped toothed plate 20 to reciprocate on the arc-shaped toothed plate 20 with the spindle 31 as the pivot.

[0043] The testing instrument assembly 40 includes a dial indicator mounting base 41 mounted on a tilting arm 32. The dial indicator mounting base 41 is connected to a dial indicator 43 measuring the arc-shaped toothed plate 20 via a universal folding bracket 42. The testing instrument assembly 40 reciprocates with the tilting arm 32 about a spindle 31, thereby causing the probe of the dial indicator 43 to contact the tooth tip or end face of the arc-shaped toothed plate 20.

[0044] In this embodiment of the application, the tooling for testing the arc-shaped toothed plate 20 uses a toothed plate fixing frame 10 to fix the arc-shaped toothed plate 20 at a set testing position. The toothed plate fixing frame 10 includes a left side plate 11 and a right side plate 12 that are parallel to each other and spaced apart, and a crossbeam connected between the left side plate 11 and the right side plate 12 for mounting the arc-shaped toothed plate 20.

[0045] The rotation detection assembly 30 is provided with a spindle 31 connected between the left side plate 11 and the right side plate 12, and a flipping swing arm 32 with one end rotatably connected to the spindle 31. The flipping swing arm 32 drives the gear 33 to reciprocate on the arc-shaped toothed plate 20 with the spindle 31 as the axis.

[0046] The dial indicator mounting base 41 located on the flip arm 32 adjusts the position and angle of the universal folding bracket 42 to adjust the contact between the dial indicator 43 and the arc-shaped toothed plate 20, thereby detecting the tooth tip circle runout and end face runout of the arc-shaped toothed plate 20, improving detection efficiency and reducing detection costs.

[0047] In some alternative embodiments: see Figures 1 to 4As shown in the figure, this application embodiment provides a tooling for detecting an arc-shaped toothed plate. One end of the left side plate 11 and the right side plate 12 of the tooling is provided with mounting holes 15 for inserting a mandrel 31. The crossbeam includes a front crossbeam 14 and a rear crossbeam 13 spaced apart from each other. The rear crossbeam 13 is provided with a fixing seat for mounting the arc-shaped toothed plate 20. The two ends of the rear crossbeam 13 are respectively connected to the left side plate 11 and the right side plate 12 and are located near the mounting holes 15.

[0048] The arc-shaped toothed plate 20 includes a sector-shaped plate 21. An arc-shaped rack 22, which meshes with the gear 33, is fixedly connected to the arc surface of the sector-shaped plate 21. The arc-shaped rack 22 and the arc surface of the sector-shaped plate 21 are welded together. The sector-shaped plate 21 is provided with a mounting plate 23 connected to a fixed seat. The center of the arc-shaped rack 22 is located on the axis of the spindle 31. When the tilting arm 32 drives the gear 33 to reciprocate on the arc-shaped rack 22 with the spindle 31 as the pivot, the gear 33 and the arc-shaped rack 22 are always in a meshing state.

[0049] In some alternative embodiments: see Figure 5 and Figure 6 As shown, this application embodiment provides a tooling for detecting an arc-shaped toothed plate. The tooling's flipping arm 32 includes two parallel and spaced-apart support arms 34, and an end plate 35 fixedly connected between the two support arms 34. The arc-shaped toothed plate 20 is located between the two support arms 34, and a rotating shaft 46 is rotatably connected to the two support arms 34 and located near one end of the end plate 35.

[0050] Two support arms 34 are connected to a clamp 36 at the end away from the end plate 35. A bearing sleeve 37 is clamped inside the clamp 36 and is fitted around the outer circumference of the spindle 31. A first bearing 38 is provided inside the bearing sleeve 37 and is coaxially connected to the spindle 31. A shoulder is provided on the outer arm in the middle of the spindle 31, and two first bearings 38 are fitted on the spindle 31 on both sides of the shoulder.

[0051] Both ends of the bearing sleeve 37 have internal threads, and the internal threads of the bearing sleeve 37 are connected to a plug 39 that fixes the first bearing 38 inside the bearing sleeve 37. The outer wall surface of the plug 39 is radially cut with a weakening groove, and the end face of the plug 39 has an axially formed fastening hole that penetrates the weakening groove. A fastener is connected to the fastening hole. When the plug 39 is screwed into the bearing sleeve 37, the plug 39 is deformed by tightening the fastener, thereby locking the plug 39 inside the bearing sleeve 37.

[0052] The clamp 36 includes an upper clamp and a lower clamp that are connected to each other. One end of the lower clamp is fixedly connected to the support arm 34. The upper clamp and the lower clamp are connected by bolts to clamp the bearing sleeve 37. Both the upper clamp and the lower clamp are semi-circular structures. The upper clamp and the lower clamp cooperate to form a ring structure to clamp the bearing sleeve 37, thereby realizing a detachable connection between the support arm 34 and the bearing sleeve 37.

[0053] In some alternative embodiments: see Figure 1 , Figure 2 , Figure 5 As shown, this application embodiment provides a tooling for detecting arc-shaped toothed plates. One end of the tooling spindle 31 is connected to a left positioning flange 44 that is adapted to the mounting hole 15 of the left side plate 11, and the other end of the spindle 31 is connected to a right positioning flange 45 that is adapted to the mounting hole 15 of the right side plate 12.

[0054] The left positioning flange 44 and the mandrel 31 are coaxially plugged and pulled together. A cotter pin is connected between the left positioning flange 44 and the mandrel 31 to restrict their axial separation. The right positioning flange 45 is fitted onto the end of the mandrel 31. The end of the mandrel 31 is provided with a pressure plate and screws to fix the right positioning flange 45 to the right side plate 12.

[0055] The rotating shaft 46 is connected to the gear 33 by a flat key. Two support arms 34 have through holes for the rotating shaft 46. Each end of the rotating shaft 46 has a second bearing 47 rotatably connected to the two support arms 34, and the second bearing 47 is located within the through holes. End caps 48, which fix the second bearings 47 within the through holes, are connected to the sidewalls of the two support arms 34 that are far apart from each other. The end caps 48 are fixedly connected to the support arms 34 by fasteners.

[0056] A nut 49 is threaded onto the rotating shaft 46 to axially fix the gear 33 onto the rotating shaft 46, thereby restricting the axial movement of the gear 33 on the rotating shaft 46 and keeping the gear 33 in a central position between the two support arms 34. A handle 50 is connected to the end of the tilting arm 32 away from the spindle 31, which is used to push the tilting arm 32 to rotate around the spindle 31. The handle 50 is convenient for holding and pushing the tilting arm 32 to rotate around the spindle 31.

[0057] In some alternative embodiments: see Figure 1 , Figure 2 As shown in the embodiment of this application, a fixture for detecting arc-shaped toothed plates is provided. The dial indicator mounting base 41 of this fixture is attached to the flipping swing arm 32 by a permanent magnet, which facilitates the adjustment of the position of the dial indicator mounting base 41 on the flipping swing arm 32. The universal folding bracket 42 includes a first connecting plate and a second connecting plate that are hinged to each other. The end of the first connecting plate away from the second connecting plate is connected to the dial indicator mounting base 41 by a ball joint, and the end of the second connecting plate away from the first connecting plate is connected to the dial indicator 43.

[0058] The first connecting plate and the second connecting plate are hinged to each other to achieve folding and unfolding, making it easy to adjust the dial indicator 43 to the set detection position. The first connecting plate is connected to the dial indicator fixing base 41 by a ball joint, so that the first connecting plate can rotate flexibly relative to the dial indicator fixing base 41, improving the flexibility of use of the dial indicator 43.

[0059] In the description of this application, it should be noted that the terms "upper," "lower," etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application. Unless otherwise expressly specified and limited, the terms "installed," "connected," and "linked" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication between two elements. For those skilled in the art, the specific meaning of the above terms in this application can be understood according to the specific circumstances.

[0060] It should be noted that in this application, relational terms such as "first" and "second" are used merely to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0061] The above description is merely a specific embodiment of this application, enabling those skilled in the art to understand or implement this application. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of this application. Therefore, this application is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features claimed herein.

Claims

1. A tooling for detecting arc-shaped toothed plates, characterized in that, include: The toothed plate fixing frame (10) includes a left side plate (11) and a right side plate (12) that are parallel to each other and spaced apart, and a crossbeam connecting the left side plate (11) and the right side plate (12), the crossbeam being used to install the arc-shaped toothed plate (20). The rotation detection assembly (30) includes a spindle (31) connected between the left side plate (11) and the right side plate (12), a flipping swing arm (32) rotatably connected to the spindle (31) at one end, and a gear (33) meshing with the arc-shaped toothed plate (20) at the other end of the flipping swing arm (32) via a rotating shaft (46). The instrument assembly (40) includes a dial indicator mounting base (41) mounted on the tilting arm (32), the dial indicator mounting base (41) being connected to a dial indicator (43) for measuring the arc-shaped toothed plate (20) via a universal folding bracket (42).

2. The tooling for detecting arc-shaped toothed plates as described in claim 1, characterized in that: The left side plate (11) and the right side plate (12) are each provided with a mounting hole (15) for inserting the mandrel (31) at one end. The crossbeam includes a front crossbeam (14) and a rear crossbeam (13) arranged at intervals. The rear crossbeam (13) is provided with a fixing seat for mounting the arc-shaped toothed plate (20). The two ends of the rear crossbeam (13) are respectively connected to the left side plate (11) and the right side plate (12) and are located at the end close to the mounting hole (15). The arc-shaped toothed plate (20) includes a sector plate (21), on which an arc rack (22) meshes with the gear (33) is fixedly connected. The sector plate (21) is provided with a mounting plate (23) connected to the fixed seat. The center of the arc rack (22) is located on the axis of the spindle (31).

3. The tooling for detecting arc-shaped toothed plates as described in claim 1, characterized in that: The flipping swing arm (32) includes two parallel and spaced-apart support arms (34) and an end plate (35) connected between the two support arms (34). The arc-shaped toothed plate (20) is located between the two support arms (34). The rotating shaft (46) is rotatably connected to the two support arms (34) and located at one end close to the end plate (35). The two support arms (34) are connected to a clamp (36) at the end away from the end plate. A bearing sleeve (37) is clamped in the clamp (36) and is sleeved on the outer periphery of the spindle (31). A first bearing (38) is provided in the bearing sleeve (37) and is coaxially connected to the spindle (31).

4. The tooling for detecting arc-shaped toothed plates as described in claim 3, characterized in that: The outer arm of the middle part of the mandrel (31) is provided with a shoulder, and two first bearings (38) are respectively located on both sides of the shoulder on the mandrel (31). The inner holes at both ends of the bearing sleeve (37) are provided with internal threads, and the internal threads of the bearing sleeve (37) are connected with plugs (39) that fix the first bearings (38) in the bearing sleeve (37).

5. The tooling for detecting arc-shaped toothed plates as described in claim 3, characterized in that: The clamp (36) includes an upper clamp and a lower clamp that are connected to each other. One end of the lower clamp is fixedly connected to the support arm (34). The upper clamp and the lower clamp are connected by bolts to clamp the bearing sleeve (37).

6. The tooling for detecting arc-shaped toothed plates as described in claim 4, characterized in that: The outer wall of the plug (39) is radially cut with a weakening groove, and the end face of the plug is axially provided with a fastening hole that penetrates the weakening groove. A fastener is connected in the fastening hole.

7. The tooling for detecting arc-shaped toothed plates as described in claim 2, characterized in that: One end of the mandrel (31) is connected to a left positioning flange (44) that is adapted to the mounting hole of the left side plate (11), and the other end of the mandrel (31) is connected to a right positioning flange (45) that is adapted to the mounting hole of the right side plate (12). The left positioning flange (44) and the mandrel (31) are coaxially plugged and plugged together. A cotter pin is connected between the left positioning flange (44) and the mandrel (31). The right positioning flange (45) is sleeved on the end of the mandrel (31). The end of the mandrel (31) is provided with a pressure plate and screws to fix the right positioning flange (45) on the right side plate (12).

8. The tooling for detecting arc-shaped toothed plates as described in claim 3, characterized in that: The rotating shaft (46) is connected to the gear (33) by a flat key. The two support arms (34) are provided with through holes for the rotating shaft (46). The two ends of the rotating shaft (46) are respectively provided with second bearings (47) that are rotatably connected to the two support arms (34). The second bearings (47) are located in the through holes. Both of the two support arms (34) are connected to end caps (48) that fix the second bearing (47) in the through hole on the side walls that are far apart from each other. The end caps (48) are fixedly connected to the support arms (34) by fasteners. The shaft (46) is threaded with a nut (49) that fixes the gear (33) axially on the shaft (46).

9. The tooling for detecting arc-shaped toothed plates as described in claim 1, characterized in that: The end of the flip arm (32) away from the spindle (31) is connected to a handle (50) that pushes the flip arm (32) to rotate around the spindle (31).

10. The tooling for detecting arc-shaped toothed plates as described in claim 1, characterized in that: The dial indicator mounting base (41) is attached to the flip arm (32) by a permanent magnet. The universal folding bracket (42) includes a first connecting plate and a second connecting plate that are hinged to each other. The end of the first connecting plate away from the second connecting plate is connected to the dial indicator mounting base (41) by a ball joint. The end of the second connecting plate away from the first connecting plate is connected to the dial indicator (43).

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