CN118009856B - Tool for detecting verticality of shaft pin hole of iron shoe of brake - Google Patents

Abstract

The invention relates to the field of verticality detection, and in particular to a brake shoe axle pin hole verticality inspection tool, comprising: an operating panel, a supporting leg is arranged at the bottom of the operating panel, a measuring component and a first insertion plug, a first spherical groove is provided on the operating panel, the measuring component comprises a movable rod, the movable rod is movably arranged on the operating panel, a mounting plate is arranged on the top of the movable rod, a rotating groove is provided at the center of the mounting plate, a rotating column is rotatably embedded in the rotating groove, a connecting block is welded on the side wall of the rotating column, a dial indicator is installed on the rotating column through the connecting block, and a measuring groove is provided on the mounting plate; it is convenient to detect two axle pin holes, saving detection time, and at the same time, when the two axle pin holes are detected for verticality, the brake shoe is in the same position, which is convenient for subsequent comparison of the verticality of the two axle pin holes through detection data, and the verticality between the two axle pin holes can also be obtained.

Description

A verticality inspection tool for brake shoe shaft pin hole

Technical Field

The invention relates to the field of verticality detection, in particular to a verticality detection tool for a brake shoe shaft pin hole.

Background technique

The brake shoe is the key friction component of the drum brake. Its main function is to cooperate with the brake drum to realize the braking function of the vehicle. During braking, the brake shoe is pressed against the brake drum that rotates with the wheel through the brake operating mechanism, and the friction between the two is used to slow down the wheel until it stops.

The brake shoe is installed on the drum brake through the axle pin hole. After the brake shoe is processed and formed, the axle pin hole on the brake shoe needs to be tested for verticality. Brake shoes are usually produced in large quantities, so a shaft pin hole verticality inspection tool with convenient operation and high detection efficiency is needed to test the verticality of the shaft pin hole on the brake shoe.

The above contents are only used to assist in understanding the technical solution of the present invention, and do not constitute an admission that the above contents are the closest prior art.

Summary of the invention

The technical problem to be solved by the present invention is to provide a brake shoe shaft pin hole verticality inspection tool which is convenient to operate and has high inspection efficiency.

To achieve the above object, the technical solution of the present invention is implemented as follows, comprising: an operating panel, the bottom of which is provided with supporting legs, a measuring assembly and a first insertion plug, the operating panel being provided with a first spherical groove;

The measuring assembly comprises a movable rod, which is movably arranged on the operating panel, a mounting plate is arranged on the top of the movable rod, a rotating groove is provided at the center of the mounting plate, a rotating column is rotatably embedded in the rotating groove, a connecting block is welded on the side wall of the rotating column, a dial indicator is installed on the rotating column through the connecting block, and a measuring groove is provided on the mounting plate;

The first insertion plug includes a first spherical block, the first spherical block is embedded in the first spherical groove, a first connecting column is arranged on the top of the first spherical block, a first detection shaft pin is inserted on the first connecting column, and a first measuring disc is inserted on the first detection shaft pin;

The rotating column is embedded in the rotating groove and a rotating disk is arranged on the outer wall thereof.

Furthermore, the operating plate is provided with a second movable groove, a movable protrusion is movably arranged in the second movable groove, a second spherical groove is provided on the movable protrusion, and a second insertion plug is embedded in the second spherical groove;

The second insertion plug includes a second spherical block, the second spherical block is embedded in the second spherical groove, a second connecting column is arranged on the top of the second spherical block, a second detection axle pin is inserted on the second connecting column, and a second measuring disk is inserted on the second detection axle pin; with this design, the two axle pin holes on the brake shoe are respectively inserted on the first insertion plug and the second insertion plug, which is convenient for detecting the two axle pin holes and saves detection time. At the same time, the brake shoe is in the same position when the two axle pin holes are detected for verticality, which is convenient for subsequent comparison of the verticality of the two axle pin holes through detection data, and the verticality between the two axle pin holes can also be obtained.

Furthermore, a first movable groove is provided on the operating panel, and a snap-in protrusion is provided at the bottom of the movable rod, and the snap-in protrusion at the bottom of the movable rod is movably arranged in the first movable groove; with this design, the movable rod is movably arranged in the first movable groove, which facilitates the verticality detection of the two axle pin holes on the brake shoe by moving the measuring component, thereby saving detection time.

Furthermore, a clamping piece is provided on the movable rod, and a first clamping hole adapted to the clamping piece is provided at the position of the first insertion plug corresponding to the operating panel, a connecting groove is provided between the first movable groove and the second movable groove, and a side plate is provided on one side of the movable protrusion, the side plate is movably arranged on the connecting groove, and a second clamping hole adapted to the clamping piece is provided on the side plate corresponding to the position of the second insertion plug; in this design, through the use of the clamping piece in conjunction with the first clamping hole and the second clamping hole, when the verticality of different axle pin holes is detected, when the measuring component is moved to the first clamping hole or the second clamping hole, the clamping piece is clamped with the first clamping hole or the second clamping hole, and at this time, the mounting plate on the measuring component is above the first insertion plug or the second insertion plug, and the position detected by the measuring component is the same during each detection, so that the obtained detection data is more comparative, while saving the time for positioning the measuring component and improving the detection efficiency.

Furthermore, the clamping part includes a perforated bottom plate, which is arranged on the side wall of the movable rod, and a sleeve is arranged on the perforated bottom plate. A hemispherical protrusion is movably arranged in the sleeve, and a telescopic spring is installed between the plane end of the hemispherical protrusion and the inner wall of the sleeve; with this design, through the use of the telescopic spring in conjunction with the hemispherical protrusion, when the movable rod is pushed by an external force, the hemispherical protrusion in the first clamping hole or the second clamping hole is clamped to squeeze the telescopic spring into the sleeve, which will not affect the movement of the movable rod.

Furthermore, a driving member is provided at the bottom of the operating panel, and the driving member includes a screw rod, a first screw hole plate, a rotating shaft plate and a second screw hole plate, the first screw hole plate is provided on the bottom wall on one side of the operating panel, the rotating shaft plate is provided on the bottom wall on the other side of the operating panel, the second screw hole plate is provided at the bottom of the movable protrusion between the first screw hole plate and the rotating shaft plate, one end of the screw rod is transmission-set on the rotating shaft plate, the other end of the screw rod passes through the first screw hole plate and the second screw hole plate, and the screw rod is threadedly connected to the first screw hole plate and the second screw hole plate, and a turntable is provided on the end surface of the other end of the screw rod; in this design, the movable protrusion is driven to move in the second movable groove by the screw rod, and when it comes to brake shoes of different sizes, the second plug-in position on the movable protrusion can be used to adapt to brake shoes of different sizes, so that there is no need to replace the equipment when detecting the verticality of brake shoes of different sizes.

Further, a first tray and a first arc-shaped clamping block are arranged on the outer side wall of the first connecting column, a first arc-shaped clamping groove clamped with the first arc-shaped clamping block is arranged at the bottom of the first detection shaft pin, a first clamping groove is arranged at the top of the first detection shaft pin, and a first clamping block clamped with the first clamping groove is arranged at the bottom of the first measuring disk;

A second tray and a second arc-shaped clamping block are arranged on the outer side wall of the second connecting column, a second arc-shaped clamping groove clamped with the second arc-shaped clamping block is arranged at the bottom of the second detection shaft pin, a second clamping groove is arranged at the top of the second detection shaft pin, and a second clamping block clamped with the second clamping groove is arranged at the bottom of the second measuring disk; with this design, the first tray and the second tray are magnetic parts, when the first detection shaft pin or the second detection shaft pin is inserted into the first connecting column or the second connecting column, the first detection shaft pin and the first connecting column or the second detection shaft pin and the second connecting column are in a vertical state through the magnetic attraction design, and at the same time, for different shaft pin holes, the first detection shaft pin and the second detection shaft pin can be replaced according to the shaft pin hole diameter, and the first clamping block and the second clamping block are also magnetic parts, so that the first measuring disk or the second measuring disk is in a vertical state when connected to the first connecting column or the second detection shaft pin, and at the same time, the plane end area of the first detection shaft pin and the second detection shaft pin is increased by the first measuring disk and the second measuring disk, so as to facilitate the detection of verticality by a dial indicator.

The beneficial effects of the present invention are embodied in:

By movably embedding the first insertion plug and the second insertion plug on the operating panel, the two axle pin holes on the brake shoe are respectively inserted on the first insertion plug and the second insertion plug, which facilitates the detection of the two axle pin holes and saves detection time. At the same time, the brake shoe is in the same position when the two axle pin holes are detected for verticality, which facilitates the subsequent comparison of the verticality of the two axle pin holes through detection data, and also can obtain the verticality between the two axle pin holes.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG1 is a schematic diagram of the three-dimensional structure of a brake shoe shaft pin hole verticality inspection tool provided by the present invention;

FIG2 is a cross-sectional view of a brake shoe shaft pin hole verticality inspection tool provided by the present invention;

FIG3 is a schematic diagram of the three-dimensional structure of the brake shoe shaft pin hole verticality inspection tool and the brake shoe provided by the present invention;

FIG4 is a schematic diagram of the three-dimensional structure of the measuring assembly provided by the present invention;

FIG5 is a schematic diagram of the three-dimensional structure of a driving member provided by the present invention;

FIG6 is a schematic diagram of the three-dimensional structure of the first inserting plug and the second inserting plug provided by the present invention;

FIG. 7 is a schematic diagram of the three-dimensional structure of the clamping member provided by the present invention.

Description of reference numerals:

1. Operation panel; 11. Support leg; 12. First moving groove; 13. Second moving groove; 14. Connecting groove; 15. First spherical groove; 16. First clamping hole; 2. Measuring assembly; 21. Movable rod; 22. Clamping protrusion; 23. Mounting plate; 231. Rotating groove; 232. Measuring groove; 24. Rotating column; 241. Rotating disk; 242. Connecting block; 25. Dial indicator; 26. Clamping piece; 261. Perforated bottom plate; 262. Sleeve; 263. Hemispherical protrusion; 264. Telescopic spring; 3. Moving protrusion; 31. Second spherical groove; 32. Side plate; 33. Second clamping hole; 4. First insertion plug; 41. First spherical block; 42. First connecting column; 421. First tray; 422. First arc-shaped snap-in block; 43. First detection shaft pin; 431. First arc-shaped snap-in groove; 432. First snap-in groove; 44. First measuring disk; 441. First snap-in block; 5. Second insertion plug; 51. Second spherical block; 52. Second connecting column; 521. Second tray; 522. Second arc-shaped snap-in block; 53. Second detection shaft pin; 531. Second arc-shaped snap-in groove; 532. Second snap-in groove; 54. Second measuring disk; 541. Second snap-in block; 6. Driving member; 61. Screw; 62. First screw hole plate; 63. Rotating shaft plate; 64. Second screw hole plate; 65. Rotating disk.

Detailed ways

The present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. Obviously, the described embodiments are only part of the embodiments of the invention, rather than all of the embodiments. In the absence of conflict, the embodiments in this application and the features in the embodiments can be combined with each other. Based on the embodiments in the invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the invention.

It should be noted that if the embodiments of the invention involve directional indications (such as up, down, left, right, front, back, etc.), the directional indications are only used to explain the relative position relationship, movement status, etc. between the components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly.

In addition, if there are descriptions involving "first", "second", etc. in the embodiments of the invention, the descriptions of "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In addition, the meaning of "and/or" appearing in the full text includes three parallel schemes. Taking "A and/or B" as an example, it includes scheme A, or scheme B, or schemes that satisfy both A and B. In addition, "multiple" refers to more than two. In addition, the technical solutions between the various embodiments can be combined with each other, but it must be based on the ability of ordinary technicians in this field to implement. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such combination of technical solutions does not exist and is not within the scope of protection required by the invention.

See Figures 1 to 7:

The present invention provides a brake shoe shaft pin hole verticality inspection tool, comprising: an operating panel 1, a support leg 11 is provided at the bottom of the operating panel 1, a measuring component 2 and a first insertion plug 4, and a first spherical groove 15 is provided on the operating panel 1;

The measuring assembly 2 comprises a movable rod 21, which is movably arranged on the operating panel 1, a mounting plate 23 is arranged on the top of the movable rod 21, a rotating groove 231 is provided at the center of the mounting plate 23, a rotating column 24 is rotatably embedded in the rotating groove 231, a connecting block 242 is welded on the side wall of the rotating column 24, a dial indicator 25 is installed on the rotating column 24 through the connecting block 242, and a measuring groove 232 is provided on the mounting plate 23;

The first insertion plug 4 includes a first spherical block 41, the first spherical block 41 is embedded in the first spherical groove 15, a first connecting column 42 is provided on the top of the first spherical block 41, a first detection shaft pin 43 is inserted on the first connecting column 42, and a first measuring disc 44 is inserted on the first detection shaft pin 43;

The rotating column 24 is embedded in the rotating groove 231 and has a rotating disk 241 on its outer wall;

In the specific implementation, the first measuring disk 44 is first removed from the first detection shaft pin 43, and then the brake shoe is placed on the operating panel 1, and the shaft pin hole on the brake shoe is inserted on the first detection shaft pin 43. Before the detection, the plane of the brake shoe is horizontal with the top surface of the operating panel 1, and the first insertion plug 4 is movably embedded in the first spherical groove 15 through the first spherical block 41, so that when the verticality deviation of the brake shoe shaft pin hole is too high, it will not affect the horizontality of the brake shoe plane and the top surface of the operating panel 1. Then, the first measuring disk 44 is inserted on the first detection shaft pin 43, and then the movable rod 21 is moved to make the mounting plate 23 above the first measuring disk 44, and then the rotating column 24 is rotated. When the rotating column 24 rotates, the dial indicator 25 is driven to rotate, and the measuring rod of the dial indicator 25 moves along the measuring groove 232, and the measuring head of the dial indicator 25 contacts the top surface of the first measuring disk 44 during the movement of the dial indicator 25, and the verticality deviation of the brake shoe shaft pin hole is obtained by recording the numerical changes of the dial indicator 25 during the movement.

In a specific embodiment of the present invention, as shown in FIG. 1 and FIG. 5 , the operating panel 1 is provided with a second movable groove 13, a movable protrusion 3 is movably arranged in the second movable groove 13, a second spherical groove 31 is provided in the movable protrusion 3, and a second insertion plug 5 is embedded in the second spherical groove 31;

The second insertion plug 5 includes a second spherical block 51, which is embedded in the second spherical groove 31. A second connecting column 52 is arranged on the top of the second spherical block 51, and a second detection axis pin 53 is inserted on the second connecting column 52, and a second measuring disk 54 is inserted on the second detection axis pin 53. With this design, the two axis pin holes on the brake shoe are respectively inserted on the first insertion plug 4 and the second insertion plug 5, which is convenient for detecting the two axis pin holes and saves detection time. At the same time, the brake shoe is in the same position when the two axis pin holes are detected for verticality, which is convenient for subsequent comparison of the verticality of the two axis pin holes through detection data, and the verticality between the two axis pin holes can also be obtained.

In a specific embodiment of the present invention, as shown in Figures 1 and 4, a first movable groove 12 is provided on the operating panel 1, and a snap-in protrusion 22 is provided at the bottom of the movable rod 21, and the snap-in protrusion 22 at the bottom of the movable rod 21 is movably set in the first movable groove 12; by movably setting the movable rod 21 in the first movable groove 12, it is convenient to perform verticality detection of the two axle pin holes on the brake shoe through the mobile measuring component 2, thereby saving detection time.

In a specific embodiment of the present invention, as shown in Figures 1, 4 and 5, a snap-in 26 is provided on the movable rod 21, a first snap-in hole 16 adapted to the snap-in 26 is provided at a position of the operating panel 1 corresponding to the first insertion plug 4, a connecting groove 14 is provided between the first movable groove 12 and the second movable groove 13, a side plate 32 is provided on one side of the movable protrusion 3, the side plate 32 is movably provided on the connecting groove 14, and a second snap-in hole 33 adapted to the snap-in 26 is provided on the side plate 32 at a position corresponding to the second insertion plug 5; the present invention is achieved by snapping The connector 26 cooperates with the first clamping hole 16 and the second clamping hole 33 so that when different axle pin holes are tested for verticality, when the measuring component 2 is moved to the first clamping hole 16 or the second clamping hole 33, the clamping component 26 is clamped with the first clamping hole 16 or the second clamping hole 33, and at this time, the mounting plate 23 on the measuring component 2 is above the first insertion hole 4 or the second insertion hole 5, and the position of the measuring component 2 is the same during each test, so that the test data obtained is more comparative, while saving the time for positioning the measuring component 2 and improving the test efficiency.

In a specific embodiment of the present invention, as shown in Figures 4 and 7, the clamping member 26 includes a perforated bottom plate 261, and the perforated bottom plate 261 is arranged on the side wall of the movable rod 21. A sleeve 262 is arranged on the perforated bottom plate 261, and a hemispherical protrusion 263 is movably arranged in the sleeve 262, and a telescopic spring 264 is installed between the plane end of the hemispherical protrusion 263 and the inner wall of the sleeve 262; the present invention uses the telescopic spring 264 in conjunction with the hemispherical protrusion 263. When an external force pushes the movable rod 21, the hemispherical protrusion 263 that is clamped with the first clamping hole 16 or the second clamping hole 33 squeezes the telescopic spring 264 into the sleeve 262, which will not affect the movement of the movable rod 21.

In a specific embodiment of the present invention, as shown in Figures 2 and 5, a driving member 6 is provided at the bottom of the operating panel 1, and the driving member 6 includes a screw 61, a first screw hole plate 62, a rotating shaft plate 63, and a second screw hole plate 64. The first screw hole plate 62 is provided on the bottom wall of one side of the operating panel 1, and the rotating shaft plate 63 is provided on the bottom wall of the other side of the operating panel 1. The second screw hole plate 64 is provided at the bottom of the moving protrusion 3 between the first screw hole plate 62 and the rotating shaft plate 63. One end of the screw 61 is provided on the rotating shaft plate 63 for transmission, and the other end of the screw 61 is provided on the rotating shaft plate 63 for transmission. The end passes through the first screw hole plate 62 and the second screw hole plate 64, and the screw rod 61 is threadedly connected to the first screw hole plate 62 and the second screw hole plate 64, and a turntable 65 is arranged on the other end face of the screw rod 61; the present invention drives the movable protrusion 3 to move in the second movable groove 13 through the screw rod 61. When it comes to brake shoes of different sizes, the position of the second plug-in unit 5 on the movable protrusion 3 can be adjusted to adapt to brake shoes of different sizes, so that there is no need to replace the equipment when detecting the verticality of brake shoes of different sizes.

In a specific embodiment of the present invention, as shown in FIG2 and FIG6 , a first tray 421 and a first arc-shaped clamping block 422 are provided on the outer side wall of the first connecting column 42, a first arc-shaped clamping groove 431 clamped with the first arc-shaped clamping block 422 is provided at the bottom of the first detection shaft pin 43, a first clamping groove 432 is provided at the top of the first detection shaft pin 43, and a first clamping block 441 clamped with the first clamping groove 432 is provided at the bottom of the first measuring disk 44;

A second tray 521 and a second arc-shaped clamping block 522 are arranged on the outer side wall of the second connecting column 52, a second arc-shaped clamping groove 531 clamped with the second arc-shaped clamping block 522 is provided at the bottom of the second detection shaft pin 53, a second clamping groove 532 is provided at the top of the second detection shaft pin 53, and a second clamping block 541 clamped with the second clamping groove 532 is provided at the bottom of the second measuring disk 54; the first tray 421 and the second tray 521 of the present invention are magnetic parts, and when the first detection shaft pin 43 or the second detection shaft pin 53 is inserted into the first connecting column 42 or the second connecting column 52, the first detection shaft pin 53 is magnetically attracted to the first connecting column 42 or the second connecting column 52. The pin 43 and the first connecting column 42 or the second detection shaft pin 53 and the second connecting column 52 are in a vertical state. At the same time, for different shaft pin holes, the first detection shaft pin 43 and the second detection shaft pin 53 can be replaced according to the diameter of the shaft pin hole. The first clamping block 441 and the second clamping block 541 are also magnetic parts. In this way, the first measuring disk 44 or the second measuring disk 54 is in a vertical state when connected to the first connecting column 42 or the second detection shaft pin 53. At the same time, the first measuring disk 44 and the second measuring disk 54 are used to increase the planar end area of the first detection shaft pin 43 and the second detection shaft pin 53, so that the verticality can be detected by the dial indicator 25.

The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims (5)

1. The utility model provides a utensil is examined to stopper iron shoe pivot hole straightness that hangs down which characterized in that includes: the measuring device comprises an operation board (1), a measuring assembly (2) and a first penetrating piece (4), wherein a first spherical groove (15) is formed in the operation board (1);

the measuring assembly (2) comprises a movable rod (21), the movable rod (21) is arranged on the operation plate (1), a mounting plate (23) is arranged at the top of the movable rod (21), a rotary groove (231) is formed in the center of the mounting plate (23), a rotary column (24) is embedded in the rotary groove (231) in a rotary mode, a connecting block (242) is welded on the side wall of the rotary column (24), a dial indicator (25) is arranged on the rotary column (24) through the connecting block (242), and a measuring groove (232) is formed in the mounting plate (23);

The first penetrating piece (4) comprises a first spherical block (41), the first spherical block (41) is embedded in the first spherical groove (15), a first connecting column (42) is arranged at the top of the first spherical block (41), a first detection shaft pin (43) is inserted into the first connecting column (42), and a first measuring disc (44) is inserted into the first detection shaft pin (43);

A second moving groove (13) is formed in the operation board (1), a moving lug (3) is movably arranged in the second moving groove (13), a second ball groove (31) is formed in the moving lug (3), and a second penetrating piece (5) is embedded in the second ball groove (31);

The second penetrating piece (5) comprises a second spherical block (51), the second spherical block (51) is embedded in the second spherical groove (31), a second connecting column (52) is arranged at the top of the second spherical block (51), a second detection shaft pin (53) is inserted into the second connecting column (52), and a second measuring disc (54) is inserted into the second detection shaft pin (53); a first tray (421) and a first arc-shaped clamping block (422) are arranged on the outer side wall of the first connecting column (42), a first arc-shaped clamping groove (431) which is clamped with the first arc-shaped clamping block (422) is formed in the bottom of the first detection shaft pin (43), a first clamping groove (432) is formed in the top of the first detection shaft pin (43), and a first clamping block (441) which is clamped with the first clamping groove (432) is arranged at the bottom of the first measurement disc (44);

The second connecting column is characterized in that a second tray (521) and a second arc-shaped clamping block (522) are arranged on the outer side wall of the second connecting column (52), a second arc-shaped clamping groove (531) which is clamped with the second arc-shaped clamping block (522) is formed in the bottom of the second detection shaft pin (53), a second clamping groove (532) is formed in the top of the second detection shaft pin (53), and a second clamping block (541) which is clamped with the second clamping groove (532) is arranged at the bottom of the second measurement disc (54).

2. The brake iron shoe axle pin hole verticality gauge according to claim 1, wherein a first moving groove (12) is formed in the operation plate (1), a clamping projection (22) is arranged at the bottom of the movable rod (21), and the clamping projection (22) at the bottom of the movable rod (21) is movably arranged in the first moving groove (12).

3. The brake iron shoe axle pin hole perpendicularity gauge according to claim 2, characterized in that a clamping piece (26) is arranged on the movable rod (21), a first clamping hole (16) matched with the clamping piece (26) is formed in the position of the corresponding first penetrating piece (4) of the operation plate (1), a connecting groove (14) is formed between the first moving groove (12) and the second moving groove (13), a side plate (32) is arranged on one side of the moving protruding block (3), the side plate (32) is movably arranged on the connecting groove (14), and a second clamping hole (33) matched with the clamping piece (26) is formed in the position of the corresponding second penetrating piece (5) on the side plate (32).

4. The brake shoe shaft pin hole perpendicularity gauge according to claim 3, wherein the clamping piece (26) comprises an opening bottom plate (261), the opening bottom plate (261) is arranged on the side wall of the movable rod (21), a sleeve (262) is arranged on the opening bottom plate (261), a hemispherical protruding block (263) is movably arranged in the sleeve (262), and a telescopic spring (264) is arranged between the plane end of the hemispherical protruding block (263) and the inner wall of the sleeve (262).

5. The brake iron shoe axle pin hole perpendicularity gauge according to claim 1, wherein a driving piece (6) is arranged at the bottom of the operation plate (1), the driving piece (6) comprises a screw rod (61), a first screw hole plate (62), a rotating shaft plate (63) and a second screw hole plate (64), the first screw hole plate (62) is arranged on the bottom wall of one side of the operation plate (1), the rotating shaft plate (63) is arranged on the bottom wall of the other side of the operation plate (1), the second screw hole plate (64) is arranged at the bottom of a moving lug (3) between the first screw hole plate (62) and the rotating shaft plate (63), one end of the screw rod (61) is arranged on the rotating shaft plate (63) in a transmission mode, the other end of the screw rod (61) penetrates through the first screw hole plate (62) and the second screw hole plate (64), the screw rod (61) is in threaded connection with the first screw hole plate (62) and the second screw hole plate (64), and a turntable (65) is arranged on the end face of the other end of the screw rod (61).