Self-puncturing rivet concentricity detector

Abstract

The utility model provides a self-puncturing rivet concentricity detector which is characterized in that a connector is arranged at the top end of one side of a mounting base through welding, and an operation angle adjusting groove is formed in the center of the connector; the operation angle adjusting module penetrates into the operation angle adjusting groove from one side of the top of the mounting base and penetrates out of the other side of the mounting base; the bottom of the gauge mounting rod is clamped in the operation angle adjusting groove, and the gauge mounting rod sleeves the operation angle adjusting module; according to the utility model, the installation pedestal, the operation angle adjusting module, the detection tool installation rod and the multi-station detection modules are adopted, the whole device is portable and easy to operate, and compared with a conventional roundness measuring instrument, the roundness measuring instrument is low in use threshold and easy to train. During use, needle gauges do not need to be switched frequently during multi-station detection, and the device is suitable for batch detection.

Description

Technical Field

[0001] The utility model relates to the field of self-piercing rivets, especially to the field of roundness detection technology of self-piercing rivets, and specifically provides a concentricity detector for self-piercing rivets. Background Art

[0002] When detecting the concentricity of the inner hole and outer wall of self-piercing rivets, a general large concentricity gauge is mostly used. The large concentricity gauge is not easy to carry, and there is a certain threshold for using the general large concentricity gauge. It requires a period of teaching and training to get started. Moreover, when using the concentricity gauge, the needle gauge needs to be frequently switched, and only one product can be detected at a time, with poor detection efficiency and not suitable for batch detection.

[0003] A portable concentricity detector is disclosed in the prior art, with the patent number CN213688190U, which discloses a portable concentricity detector, including a detector main body. A measuring hole is opened on the detector main body. A lever dial indicator is provided on the detector main body. The lever dial indicator has a measuring head that extends into the measuring hole and the end of which extends out of the lower end surface of the detector main body. A bearing platform is provided on the lower end surface of the detector main body on one side of the measuring head. An adjustment hole extending radially along the measuring hole is opened on the detector main body. An adjustment column is slidably connected in the adjustment hole. One end of the adjustment column is connected to the bearing platform, and the other end is threadedly connected with a locking screw. The locking screw has a rotating head with an end face abutting against the upper end surface of the detector main body. This concentricity detector has the characteristics of convenient adjustment and flexible use, with a complete overall function and strong practicability. However, this technical solution can only detect large parts, and the detection objects are mainly round holes or round grooves, and it is judged whether the concentricity requirements are met through multi-point simultaneous detection, and it is impossible to detect self-piercing rivets. Summary of the Invention

[0004] In view of the above-mentioned disadvantages of the prior art, the purpose of the present utility model is to provide a concentricity detector for self-piercing rivets to solve the difficulties of the prior art.

[0005] To achieve the above purpose and other related purposes, the present utility model provides a concentricity detector for self-piercing rivets, including:

[0006] An installation base 1, one side top of the installation base 1 is provided with a connection head 2 by welding, and an operation angle adjustment groove 21 is opened in the center of the connection head 2;

[0007] An operation angle adjustment module 3, the operation angle adjustment module 3 penetrates from one side of the top of the installation base 1 through the operation angle adjustment groove 21 and penetrates out from the other side of the installation base 1;

[0008] The fixture installation rod 4, the bottom of the fixture installation rod 4 is clamped in the operation angle adjustment slot 21, and the fixture installation rod 4 is sleeved on the operation angle adjustment module 3;

[0009] The multi-station detection module 5, the multi-station detection module 5 is arranged at equal intervals and interspersed on the left or right side or the front or back side of the top of the fixture installation rod 4.

[0010] Furthermore, technicians can change the angle of the fixture installation rod 4 inclining towards themselves through the operation angle adjustment module 3 according to their own standing positions and the placement height of the installation base 1.

[0011] In this technical solution, changing the use angle of the fixture installation rod 4 inclining towards the technician can enable the technician to operate and observe the multi-station detection module 5 while sitting still without having to stand or squat semi-crouched to reach a relatively comfortable working state.

[0012] According to the preferred solution, the operation angle adjustment module 3 includes:

[0013] The first threaded hole 31, the first threaded hole 31 is opened on the left or right side of the top of the connector 2, and the bottom of the first threaded hole 31 communicates with the operation angle adjustment slot 21;

[0014] The nut installation groove 32, the nut installation groove 32 is opened on the side of the top of the connector 2 away from the first threaded hole 31, the bottom of the nut installation groove 32 communicates with the operation angle adjustment slot 21, and a first nut 33 is clamped in the nut installation groove 32;

[0015] The pressing handle 34, the pressing handle 34 is arranged on the side of the top of the connector 2 away from the first nut 33, a first bolt 35 is inserted through the center of one side of the pressing handle 34, the top of the first bolt 35 abuts against the pressing handle 34, and the bottom of the first bolt 35 extends vertically outward after passing through the pressing handle 34, the first threaded hole 31 and the first nut 33 in sequence.

[0016] Furthermore, tighten the first bolt 35 to make the pressing handle 34 closely adhere to the connector 2 to give an axial locking force to one side of the top of the connector 2, and cooperate with the locked first nut 33 to limit the fixture installation rod 4.

[0017] According to the preferred solution, the bottom of the fixture installation rod 4 is a square convex platform-shaped block 41, the center of the block 41 is a through hole 44, the block 41 is clamped in the operation angle adjustment slot 21 and sleeved on the center of the first bolt 35 through the through hole 44, the top of the fixture installation rod 4 is a cylindrical rod body 42, and needle gauge insertion holes 43 are arranged at equal intervals on the front, back, left and right sides of the rod body 42.

[0018] In this technical solution, the inserted needle gauge jacks 43 can make the installation of the multi-station detection module 5 more flexible, enabling technicians to freely adjust the installation method of the multi-station detection module 5 according to their usage status and standing position.

[0019] According to the preferred solution, the multi-station detection module 5 includes:

[0020] Dial indicator mounting blocks 51, several of the dial indicator mounting blocks 51 are provided, clamping holes 511 are opened on the left or right side of the top of the dial indicator mounting blocks 51, and several of the dial indicator mounting blocks 51 are inserted and sleeved on the left and right sides of the top rod body 42 of the fixture mounting rod 4 at equal intervals through the clamping holes 511;

[0021] Tightening slots 512 are opened at one end of the dial indicator mounting blocks 51 close to the clamping holes 511, and the bottom of the tightening slots 512 communicates with the clamping holes 511;

[0022] Second threaded holes 513 are opened on the front and back sides of the dial indicator mounting blocks 51, the bottom of the second threaded holes 513 communicates with the tightening slots 512, and second bolts 514 are inserted through the centers of the second threaded holes 513;

[0023] Dial indicator mounting jacks 515 are opened on the side of the top of the dial indicator mounting blocks 51 away from the clamping holes 511;

[0024] Dial indicators 52 are provided on one side of the dial indicator mounting blocks 51, and the bottom probes 521 of the dial indicators 52 extend vertically downward through the dial indicator mounting jacks 515;

[0025] Dial indicator limiting holes 516 are opened on the front and back sides of the dial indicator mounting blocks 51 in the direction close to the dial indicator mounting jacks 515, the bottoms of the dial indicator limiting holes 516 communicate with the dial indicator mounting jacks 515, third bolts 517 are inserted into the dial indicator limiting holes 516, third nuts 518 are sleeved on the bottoms of the third bolts 517, and the bottom ends of the nuts at the tops of the third bolts 517 and the top ends of the third nuts 518 are in contact with the surfaces of the sleeves 523 on the outer sides of the measuring rods 522 at the tops of the probes 521;

[0026] Needle gauges 53 are provided directly below the dial indicator mounting blocks 51, one side of the needle gauges 53 is in contact with the probes 521, needle gauge mounting sleeves 54 are sleeved on the sides of the needle gauges 53 away from the probes 521, and one side of the needle gauge mounting sleeves 54 is clamped in the needle gauge jacks 43 by clearance fit.

[0027] In this technical solution, the dial indicator mounting block 51 is sleeved on the top of the fixture mounting rod 4 through the clamping hole 511, and the dial indicator mounting block 51 is limited by tightening the second bolt 514 to change the aperture of the clamping hole 511. The dial indicator 52 is inserted into the dial indicator mounting jack 515, and by tightening the third bolt 517, the nut of the third bolt 517 and the third nut 518 are made to abut against the outer sleeve 523 of the measuring rod 522 at the top of the measuring head 521 to complete the support and limitation of the dial indicator 52.

[0028] According to the preferred solution, the clamping hole 511 is larger than the outer diameter of the rod body 42.

[0029] The utility model adopts an installation base, an operation angle adjustment module, a fixture mounting rod and a multi-station detection module. The whole device is portable and easy to operate. Compared with the existing roundness instrument, the use threshold is lower and it is easy to train. When in use, there is no need to frequently switch the pin gauges for multi-station detection, which is suitable for batch detection.

[0030] In the following text, the optimal embodiments of implementing the utility model will be described in more detail with reference to the accompanying drawings, so as to easily understand the features and advantages of the utility model. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1 It shows a three-dimensional structural schematic diagram of the utility model;

[0032] Figure 2 It shows an enlarged three-dimensional structural schematic diagram of the connector in the utility model;

[0033] Figure 3 It shows an enlarged three-dimensional structural schematic diagram of the operation angle adjustment module in the utility model;

[0034] Figure 4 It shows an enlarged three-dimensional structural schematic diagram of the fixture mounting rod in the utility model;

[0035] Figure 5 It shows an enlarged three-dimensional structural schematic diagram of the dial indicator mounting block in the multi-station detection module of the utility model;

[0036] Figure 6 It shows an enlarged three-dimensional structural schematic diagram of the dial indicator, pin gauge and pin gauge mounting sleeve in the multi-station detection module of the utility model;

[0037] LABEL DESCRIPTION

[0038] 1. Installation base;

[0039] 2. Connector;

[0040] 21. Operation angle adjustment slot;

[0041] 3. Operation angle adjustment module;

[0042] 31. First threaded hole;

[0043] 32. Nut installation groove;

[0044] 33. First nut;

[0045] 34. Press handle;

[0046] 35. First bolt;

[0047] 4. Fixture installation rod;

[0048] 41. Clamping block;

[0049] 42. Rod body;

[0050] 43. Pin gauge jack;

[0051] 44. Through hole;

[0052] 5. Multi-station detection module;

[0053] 51. Dial indicator installation block;

[0054] 511. Clamping hole;

[0055] 512. Tightening and loosening groove;

[0056] 513. Second threaded hole;

[0057] 514. Second bolt;

[0058] 515. Dial indicator installation jack;

[0059] 516. Dial indicator limit hole;

[0060] 517. Third bolt;

[0061] 518. Third nut;

[0062] 52. Dial indicator;

[0063] 521. Probe;

[0064] 522. Measuring rod;

[0065] 523. Sleeve;

[0066] 53. Pin gauge;

[0067] 54. Pin gauge installation sleeve. Specific implementation method

[0068] In order to make the objectives, technical solutions, and advantages of the technical solutions of the present utility model clearer, the technical solutions of the embodiments of the present utility model will be clearly and completely described below in conjunction with the drawings of the specific embodiments of the present utility model. The same reference numerals in the drawings represent the same components. It should be noted that the described embodiments are only a part of the embodiments of the present utility model, rather than all of the embodiments. Based on the described embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative efforts fall within the protection scope of the present utility model.

[0069] Compared with the embodiments shown in the drawings, the feasible implementation schemes within the protection scope of the present utility model may have fewer components, have other components not shown in the drawings, different components, differently arranged components, or differently connected components, etc. In addition, two or more components in the drawings may be implemented in a single component, or a single component shown in the drawings may be implemented as multiple separate components.

[0070] Unless otherwise defined, the technical terms or scientific terms used herein shall have the ordinary meanings understood by those of ordinary skill in the art to which the present utility model belongs. The "first", "second", and similar terms used in the description and claims of the patent application of the present utility model do not indicate any order, quantity, or importance, but are only used to distinguish different components. Similarly, similar terms such as "a" or "one" do not necessarily indicate a quantity limitation. The terms "comprising" or "including" and similar terms mean that the elements or objects appearing before the term cover the elements or objects listed after the term and their equivalents, without excluding other elements or objects. The terms "connected" or "coupled" and similar terms are not limited to physical or mechanical connections, but may include electrical connections, whether direct or indirect. The terms "upper", "lower", "left", "right", etc. are only used to represent relative positional relationships, and when the absolute position of the object being described changes, the relative positional relationship may also change accordingly.

[0071] The present utility model provides a concentricity detector for self-piercing rivets, which is used in the concentricity detection process of self-piercing rivets. The present utility model does not limit the specifications, sizes, and types of self-piercing rivets, but the structure of the concentricity detector for self-piercing rivets is particularly suitable for detecting the concentricity between the inner hole and the outer wall of self-piercing rivets.

[0072] Generally speaking, the concentricity detector for self-piercing rivets proposed by the present utility model mainly includes: a mounting base 1, an operation angle adjustment module 3, a fixture mounting rod 4, and a multi-station detection module 5. Among them, reference can be made to Figure 1 , which shows the layout relationship of the mounting base 1, the operation angle adjustment module 3, the fixture mounting rod 4, and the multi-station detection module 5.

[0073] Embodiment 1: When the concentricity detector for self-piercing rivets proposed by the present utility model is in use, the inspection tool mounting rod 4 can be adjusted to an angle inclined towards oneself by controlling the operation angle adjustment module 3. Then, as Figure 1 shown, at least 4 dial indicator mounting blocks 51 are inserted and spaced on the inspection tool mounting rod 4, and the dial indicator mounting blocks 51 are fixed on the inspection tool mounting rod 4 by the second bolts 514. According to the outer circle characteristics of the self-piercing rivets to be detected, a dial indicator 52 with a conical or spherical probe 521 is selected, and the dial indicator 52 is inserted into the clamping hole 511 in each dial indicator mounting block 51, and the dial indicator 52 is limited by tightening the third bolt 517. According to the inner hole diameter of the self-piercing rivets to be detected, a corresponding pin gauge 53 is selected. A pin gauge mounting sleeve 54 is sleeved on one side of the pin gauge 53, and then the other side of the pin gauge 53 is clamped into the inner hole of the self-piercing rivet to be detected. The pin gauge mounting sleeve 54 is inserted into a suitable pin gauge jack 43, so that the outer contour of the self-piercing rivet to be detected abuts against the probe 521 at the bottom of the dial indicator 52, but only gives a slight downward pressure to the outer diameter of the self-piercing rivet, and it is not easy to make the amplitude of the probe 521 of the dial indicator 52 be pushed out too much, otherwise it will affect the service life of the dial indicator. Then, rotate the outer dial of the dial indicator 52 to make its pointer return to the 0 position, rotate the self-piercing rivet one circle, record the maximum value and the minimum value pointed by the pointer of the dial indicator 52, and subtract the recorded positive maximum value and negative minimum value to obtain the concentricity value of the self-piercing rivet. The operation is simple and can be quickly mastered. As long as one can understand the dial indicator, no additional training is required.

[0074] Embodiment 2: When the concentricity detector for self-piercing rivets proposed by the present utility model is in use, if a large number of self-piercing rivets of one specification are to be detected, all the dial indicators 52 and pin gauges 53 in the multi-station detection module 5 can be replaced with those adapted to this specification. During detection, all the self-piercing rivets to be detected are put on one side of all the pin gauges 53, and then the self-piercing rivets to be detected are rotated in turn, and the maximum value and the minimum value of multiple self-piercing rivets to be detected are recorded at the same time. The self-piercing rivets with large numerical fluctuations are calculated separately. If the concentricity value does not meet the requirements, they can be screened out, which can improve the detection efficiency and reduce the calculation amount.

[0075] Embodiment 3: When the concentricity detector for self-piercing rivets proposed by the present utility model is in use, if it is necessary to frequently detect two fixed specifications of self-piercing rivets, the dial indicators 52 and pin gauges 53 on the left or front side of the inspection tool mounting rod 4 are set to be adapted to one specification, and the dial indicators 52 and pin gauges 53 on the right or rear side of the inspection tool mounting rod 4 are set to be adapted to the other specification. When batch detecting different specifications, only need to grab the mounting base 1 and move it to a position suitable for loading the self-piercing rivets to be detected and observing the values on the dial indicator 52, which can improve the detection efficiency.

[0076] Embodiment 3: When the concentricity detector for self-piercing rivets proposed by the present utility model is in use, if it is necessary to frequently detect more than two types of self-piercing rivets with various fixing specifications, each self-piercing rivet specification is corresponded to the dial indicator 52 and the pin gauge 53 on each dial indicator mounting block 51. Each group of the dial indicator 52 and the pin gauge 53 is used to detect self-piercing rivets with different specifications. And stickers recording the parameters of the self-piercing rivets of the detected specifications are pasted on the conspicuous place on the surface of the corresponding dial indicator mounting block 51. When in use, there is no need to adjust and replace the dial indicator 52 and the pin gauge 53 in the multi-station detection module 5 back and forth, thus improving the detection efficiency.

[0077] On one side top of the above-mentioned mounting base 1, a connector 2 is arranged by welding. A central operation angle adjustment slot 21 is opened in the connector 2. The operation angle adjustment module 3 penetrates into the mounting base 1 from one side of the top of the mounting base 1, passes through the operation angle adjustment slot 21 and exits from the other side of the mounting base 1. The operation angle adjustment module 3 includes: a first threaded hole 31, a nut installation groove 32 and a pressing handle 34. Among them, the first threaded hole 31 is opened on the left or right side of the top of the connector 2. The bottom of the first threaded hole 31 communicates with the operation angle adjustment slot 21. A nut installation groove 32 is opened on the side of the top of the connector 2 away from the first threaded hole 31. The bottom of the nut installation groove 32 communicates with the operation angle adjustment slot 21. A first nut 33 is clamped in the nut installation groove 32. A pressing handle 34 is arranged on the side of the top of the connector 2 away from the first nut 33. A first bolt 35 penetrates through the center on one side of the pressing handle 34. The top of the first bolt 35 abuts against the pressing handle 34. The bottom of the first bolt 35 sequentially passes through the pressing handle 34, the first threaded hole 31 and the first nut 33 and then extends vertically outwards. The bottom of the gauge installation rod 4 is clamped in the operation angle adjustment slot 21. The gauge installation rod 4 is sleeved on the first bolt 35. After adjusting the gauge installation rod 4 to a suitable angle in the operation angle adjustment slot 21, tighten the first bolt 35 to make the pressing handle 34 closely adhere to the connector 2 to give an axial locking force to one side of the top of the connector 2 and cooperate with the locked first nut 33 to limit the gauge installation rod 4. Technicians can, according to their own standing positions and the placement height of the mounting base 1, change the angle of the gauge installation rod 4 inclining towards themselves through the operation angle adjustment module 3, so that technicians can maintain a sitting state without standing or semi-squatting when operating and observing the multi-station detection module 5 to reach a relatively comfortable working state.

[0078] It should also be noted that the bottom of the fixture installation rod 4 is a square convex platform-shaped block 41. There is a through hole 44 in the center of the block 41. The block 41 is clamped in the operation angle adjustment groove 21 and sleeved on the center of the first bolt 35 through the through hole 44. The top of the fixture installation rod 4 is a cylindrical rod body 42. Needle gauge insertion holes 43 are equidistantly arranged in a staggered manner on the front, back, left, and right sides of the rod body 42. The staggered needle gauge insertion holes 43 can make the installation of the multi-station detection module 5 more flexible, enabling technicians to freely adjust the installation method of the multi-station detection module 5 according to their usage status and standing position.

[0079] The above-mentioned multi-station detection modules 5 are equidistantly arranged in a staggered manner on the left and right or front and back sides of the top of the fixture installation rod 4. The multi-station detection module 5 includes: a dial indicator mounting block 51, a clamping hole 511, a second bolt 514, a dial indicator insertion hole 515, a dial indicator 52, a third nut 518, a needle gauge 53, and a needle gauge mounting sleeve 54. Among them, a clamping hole 511 is opened on the left or right side of the top of the dial indicator mounting block 51. There are several dial indicator mounting blocks 51. Several dial indicator mounting blocks 51 are equidistantly sleeved on the left and right sides of the rod body 42 at the top of the fixture installation rod 4 through the clamping holes 511 in a staggered manner. An elastic groove 512 is opened at one end of the dial indicator mounting block 51 close to the clamping hole 511. The bottom of the elastic groove 512 communicates with the clamping hole 511. Second threaded holes 513 are opened on the front and back sides of the dial indicator mounting block 51. The bottom of the second threaded holes 513 communicates with the elastic groove 512. A second bolt 514 is inserted through the center of the second threaded holes 513. Tightening the second bolt 514 changes the aperture of the clamping hole 511 to limit the dial indicator mounting block 51. A dial indicator insertion hole 515 is opened on the side of the dial indicator mounting block 51 away from the clamping hole 511 at the top. The bottom probe 521 of the dial indicator 52 extends vertically downward through the dial indicator insertion hole 515. Dial indicator limiting holes 516 are opened on the front and back sides of the dial indicator mounting block 51 in the direction close to the dial indicator insertion hole 515. The bottom of the dial indicator limiting holes 516 communicates with the dial indicator insertion hole 515. A third bolt 517 is inserted into the dial indicator limiting holes 516. A third nut 518 is sleeved at the bottom of the third bolt 517. The bottom end of the nut at the top of the third bolt 517 and the top end of the third nut 518 are in contact with the surface of the sleeve 523 on the outside of the measuring rod 522 at the top of the probe 521. A needle gauge 53 is arranged directly below the dial indicator mounting block 51. One side of the needle gauge 53 is in contact with the probe 521. A needle gauge mounting sleeve 54 is sleeved on the side of the needle gauge 53 away from the probe 521. One side of the needle gauge mounting sleeve 54 is clamped in the needle gauge insertion hole 43.

[0080] The above embodiments are only illustrative of the principles and effects of the present utility model, and are not intended to limit the present utility model. Any person familiar with this technology can modify or change the above embodiments without departing from the spirit and scope of the present utility model. Therefore, all equivalent modifications or changes made by those with ordinary knowledge in the technical field without departing from the spirit and technical idea disclosed by the present utility model should still be covered by the claims of the present utility model.

Claims

1. A concentricity detector for self-piercing rivets, characterized in that, Including: An installation base (1), on the top side of one side of the installation base (1), a connection head (2) is provided by welding, and an operation angle adjustment slot (21) is opened in the middle of the connection head (2); An operation angle adjustment module (3), the operation angle adjustment module (3) penetrates into the installation base (1) from one side of the top of the installation base (1), passes through the operation angle adjustment slot (21), and exits from the other side of the installation base (1); A fixture installation rod (4), the bottom of the fixture installation rod (4) is clamped in the operation angle adjustment slot (21), and the fixture installation rod (4) is sleeved on the operation angle adjustment module (3); A multi-station detection module (5), the multi-station detection module (5) is arranged at equal intervals and interspersed on the left and right or front and back sides of the top of the fixture installation rod (4).

2. The self-piercing rivet concentricity detector according to claim 1, wherein The operation angle adjustment module (3) includes: A first threaded hole (31), the first threaded hole (31) is opened on the left or right side of the top of the connection head (2), and the bottom of the first threaded hole (31) communicates with the operation angle adjustment slot (21); A nut installation groove (32), the nut installation groove (32) is opened on the side of the top of the connection head (2) away from the first threaded hole (31), the bottom of the nut installation groove (32) communicates with the operation angle adjustment slot (21), and a first nut (33) is clamped in the nut installation groove (32); A pressing handle (34), the pressing handle (34) is arranged on the side of the top of the connection head (2) away from the first nut (33), a first bolt (35) is penetrated through the middle of one side of the pressing handle (34), the top of the first bolt (35) abuts against the pressing handle (34), and the bottom of the first bolt (35) sequentially passes through the pressing handle (34), the first threaded hole (31) and the first nut (33) and then extends vertically outwards.

3. The concentricity detector for self-piercing rivets according to claim 2, wherein The bottom of the fixture installation rod (4) is a square convex platform-shaped block (41), a through hole (44) is in the middle of the block (41), the block (41) is clamped in the operation angle adjustment slot (21) and is sleeved on the middle of the first bolt (35) through the through hole (44), the top of the fixture installation rod (4) is a cylindrical rod body (42), and needle gauge insertion holes (43) are arranged at equal intervals and interspersed on the front, back, left and right sides of the rod body (42).

4. The self-piercing rivet concentricity detector according to claim 3, characterized in that, The multi-station detection module (5) includes: Dial indicator installation blocks (51), several dial indicator installation blocks (51) are provided, a clamping hole (511) is opened on the left or right side of the top of the dial indicator installation block (51), and several dial indicator installation blocks (51) are arranged at equal intervals and interspersed and sleeved on the left and right sides of the rod body (42) at the top of the fixture installation rod (4) through the clamping holes (511); A tightening and loosening groove (512), the tightening and loosening groove (512) is opened at one end of the dial indicator installation block (51) close to the clamping hole (511), and the bottom of the tightening and loosening groove (512) communicates with the clamping hole (511); The second threaded hole (513) is provided on the front and rear sides of the dial indicator mounting block (51). The bottom of the second threaded hole (513) communicates with the tightening and loosening groove (512). A second bolt (514) is inserted through the center of the second threaded hole (513). The dial indicator mounting jack (515) is provided on one side of the top of the dial indicator mounting block (51) away from the clamping hole (511). The dial indicator (52) is arranged on one side of the dial indicator mounting block (51). The bottom probe (521) of the dial indicator (52) extends vertically downward through the dial indicator mounting jack (515). The dial indicator limiting hole (516) is provided on the front and rear sides of the dial indicator mounting block (51) in the direction close to the dial indicator mounting jack (515). The bottom of the dial indicator limiting hole (516) communicates with the dial indicator mounting jack (515). A third bolt (517) is inserted through the dial indicator limiting hole (516). A third nut (518) is sleeved on the bottom of the third bolt (517). The bottom end of the top nut of the third bolt (517) and the top end of the third nut (518) are in contact with the surface of the sleeve (523) on the outside of the measuring rod (522) at the top of the probe (521). The pin gauge (53) is arranged directly below the dial indicator mounting block (51). One side of the pin gauge (53) is in contact with the probe (521). A pin gauge mounting sleeve (54) is sleeved on the side of the pin gauge (53) away from the probe (521). One side of the pin gauge mounting sleeve (54) is clamped in the pin gauge jack (43) by clearance fit.

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