Brake disc detection tool and detection method

Abstract

The invention relates to the field of brake disc surface contour detection, and particularly discloses a brake disc detection tool and a detection method.The brake disc detection tool comprises a detection tool body, the detection tool body comprises a holding part and an imbedding part, and a plurality of hole site groove wall detection assemblies are distributed in a cavity area of the imbedding part along a dispersion curve; the hole site groove wall detection assembly comprises two semicircular indicators which can be spliced into a circle, the outer arc surface of each semicircular indicator is fixedly connected with a contact ball rod and a rib spacing and height detection assembly, and the rib spacing and height detection assembly comprises a fitting surrounding part, a rib outer curved surface fitting part and a rib inner curved surface fitting part; the brake disc arc-shaped air channel testing fixture provided by the technical scheme is simple in structure, when the placement part is inserted into the air channel, the heat dissipation hole is taken as an observation center, and the distance between the heat dissipation hole and the heat dissipation rib plate, the distribution correction of the heat dissipation hole along a dispersion curve and the axial lifting of the fitting surrounding part along the semicircular indicator can be respectively obtained; and determining the air duct width according to the exposure condition of the first contrast surface.

Description

Technical Field

[0001] The present invention relates to the field of brake disc surface profile detection, and specifically to a brake disc inspection tool and a detection method. Background Art

[0002] In order to ensure the heat dissipation effect, air ducts are provided in the radial direction of the brake disc. The air ducts are mainly formed by splicing between two brake disc bodies and air duct rib plates. Heat dissipation holes are provided on the surface of the brake disc, and the heat dissipation holes are located at the air ducts. After the brake disc is processed, a dynamic balance test needs to be carried out. The purpose of the dynamic balance test is to ensure the uniformity of the mass distribution of the brake disc. If the rib distribution of the brake disc is uneven and the distribution of the heat dissipation holes is uneven, it will lead to too many adjustment parameters for the brake disc during the dynamic balance process. The air duct of the brake disc is located inside, and the curved air duct cannot be directly observed through the circumferential surface of the brake disc. Therefore, it is impossible to identify the defects of the brake disc in the form of visual processing.

[0003] Therefore, it is necessary to design a brake disc inspection tool to detect features such as the distribution profile of the curved air duct and the heat dissipation holes, and screen out brake discs with large specification deviations, which can improve the efficiency of subsequent dynamic balance adjustment of the brake disc and avoid excessive adjustment of the brake disc. Summary of the Invention

[0004] The purpose of the present invention is to provide a brake disc inspection tool and a detection method, which utilize the cooperation between the semi-circular indicator and the heat dissipation holes to obtain multiple parameters such as the hole position, the distance between the hole and the rib wall, the distance between two ribs, and the air duct width, so as to solve the problems proposed in the above background art.

[0005] To achieve the above purpose, the present invention provides the following technical solutions: A brake disc inspection tool, comprising: An inspection tool main body, which includes a holding part and a placing part; A hole position and groove wall detection component, several of which are distributed along a dispersion curve in the cavity area of the placing part. The hole position and groove wall detection component includes two semi-circular indicators that can be spliced into a circle. A contact ball rod is fixedly connected to the outer arc surface of the semi-circular indicator, and the contact ball rod is slidably connected to the placing part. The placing part and the semi-circular indicator are elastically connected by a tension spring; A rib distance and height detection component, which includes a fitting and surrounding part, a rib outer curved surface fitting part, and a rib inner curved surface fitting part. The radian of the fitting and surrounding part fits the circumferential surface of the brake disc. The fitting and surrounding part is located between the holding part and the placing part, and the rib outer curved surface fitting part and the rib inner curved surface fitting part are respectively installed on the side of the fitting and surrounding part close to the brake disc.

[0006] As a further scheme of the present invention: There is a distance between the placing part and the air duct rib plate.

[0007] As a further solution of the present invention: the outer diameter of the semi-circular indicator is equal to the inner diameter of the brake disc cooling holes, and a second reference surface is provided on the surface of the semi-circular indicator.

[0008] As a further solution of the present invention: the second reference surface is composed of multiple concentric color bands with different diameters.

[0009] As a further solution of the present invention: both ends of the outer curved surface fitting part of the rib and the inner curved surface fitting part of the rib, which are far away from the fitting and surrounding part, have bending parts, and the bending direction of the bending parts is the side away from the fitting and surrounding part.

[0010] As a further solution of the present invention: Teflon films are attached to the opposite sides of the outer curved surface fitting part of the rib and the inner curved surface fitting part of the rib.

[0011] As a further solution of the present invention: the height of the fitting and surrounding part is equal to the thickness of the brake disc, and a first reference surface is provided on the side of the fitting and surrounding part close to the brake disc.

[0012] As a further solution of the present invention: the thickness of the insertion part is equal to the standard width of the brake disc ventilation groove.

[0013] As a further solution of the present invention: a detection method for a brake disc inspection tool includes: S1: Hold the holding part, insert the insertion part into the brake disc cooling channel. There is a distance between the insertion part and the air duct rib plate. The insertion of the insertion part into the brake cooling channel has little resistance, and the insertion part can be smoothly inserted into the cooling channel. The width of the cooling channel is greater than or equal to the thickness of the insertion part; S2: The fitting and surrounding part contacts the arc edge of the brake disc. Hold the holding part and shake it along the axial direction of the brake disc, and observe the exposure state of the first reference surface. If the first reference surface is exposed, the width of the cooling channel is greater than the thickness of the insertion part, and the brake disc channel is unqualified. If there is no exposed color on the first reference surface, the brake disc channel is qualified; S3: The outer curved surface fitting part of the rib and the inner curved surface fitting part of the rib are respectively attached to the outer arc surface and the inner arc surface of the two air duct rib plates. The outer curved surface fitting part of the rib and the inner curved surface fitting part of the rib limit the insertion part to be in the central state of the brake disc cooling channel. The fitting and surrounding part limits the insertion depth of the insertion part into the brake disc cooling channel. The fitting and surrounding part cannot contact the circumferential surface of the brake disc. When the distance between the two air duct rib plates is greater than the specified standard, and the fitting and surrounding part contacts the circumferential surface of the brake disc and cannot shake along the circumferential surface of the brake disc, the distance between the two air duct rib plates meets the specified standard; S4: The contact ball screw contacts the air duct rib plate, and the tension spring undergoes elastic deformation under the push of the contact ball screw. The two semi-circular indicators move relative to each other. When the distances between the brake disc holes and the air duct rib plates on both sides are qualified, the circular ring formed by splicing the second reference surfaces is exposed through the brake disc cooling holes. When the distances between the brake disc holes and the air duct rib plates on both sides are less than the standard distance, the semi-circular indicators are relatively extruded and deformed, or the fitting and surrounding part cannot contact the arc edge of the brake disc. When the distances between the brake disc holes and the air duct rib plates on both sides are greater than the standard distance, the second reference surfaces cannot form a closed loop, and the brake disc cooling holes deviate from the dispersion curve. When observing through the brake disc cooling holes, the center of the closed loop formed by the second reference surfaces and the center of the cooling holes are not on the vertical line.

[0014] In this technical solution, two air duct rib plates are used for position limitation, and the fitting and surrounding part is used for depth limitation. The insertion part enters the inside of the channel. Based on the distribution characteristics of the cooling holes along the dispersion curve, taking the dispersion curve as the basis, and using the cooperation between the semi-circular indicators and the cooling holes, multiple parameters such as the hole position, the distance between the hole and the rib wall, the distance between the two ribs, and the air duct width are obtained.

[0015] Compared with the prior art, the beneficial effects of the present invention are as follows: Ⅰ: The brake disc arc-shaped air duct detection tool provided by this technical solution has a simple structure. When the insertion part is inserted into the air duct and the cooling holes are used as the observation center, the distances between the cooling holes and the cooling rib plates and the results of the distribution calibration of the cooling holes along the dispersion curve can be obtained respectively.

[0016] Ⅱ: The outer-curved surface fitting part and the inner-curved surface fitting part of the rib realize the detection of the distance between the air duct rib plates and the positioning of the insertion part, solve the problem of difficult entry of the insertion part, and improve the detection accuracy of Advantage Ⅰ.

[0017] Ⅲ: When the insertion part enters the air duct, the fitting and surrounding part is lifted along the axial direction of the semi-circular indicator, and the air duct width is determined according to the exposure situation of the first reference surface. And the positioning of the insertion part is carried out to realize the limit of the insertion depth of the insertion part and improve the detection accuracy of Advantage Ⅰ. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following will briefly introduce the drawings required for use in the embodiments or the description of the prior art. Obviously, the following drawings are only some embodiments of the present invention. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0019] Figure 1 It is a top view schematic diagram when a brake disc detection tool is in use; Figure 2 It is a three-dimensional schematic diagram when a brake disc detection tool is in use; Figure 3It is a schematic perspective sectional view when a brake disc inspection tool is in use; Figure 4 It is Figure 3 the top view schematic diagram of; Figure 5 It is a schematic perspective view of a brake disc inspection tool; In the figure: 100, dispersion curve; 1, holding part; 2, fitting and surrounding part; 21, first reference surface; 3, outer curved surface fitting part of rib; 4, inner curved surface fitting part of rib; 5, insertion part; 6, semi-circular indicator; 61, second reference surface; 7, tension spring; 8, contact ball rod. Specific implementation mode

[0020] Please refer to Figures 1-5 , in this embodiment: it includes: inspection tool main body, and the inspection tool main body includes a holding part 1 and an insertion part 5.

[0021] In this embodiment: the holding part 1 and the insertion part 5 can be integrally formed or fixed by screws and other fixing methods. The holding part 1 provides a holding area for the operator, and the operator inserts the insertion part 5 into the air duct by holding the holding part 1.

[0022] In this embodiment: the hole position groove wall detection assembly, several hole position groove wall detection assemblies are distributed along the dispersion curve 100 in the cavity area of the insertion part 5. The hole position groove wall detection assembly includes two semi-circular indicators 6 that can be spliced into a circle. The outer arc surface of the semi-circular indicator 6 is fixedly connected with a contact ball rod 8, and the contact ball rod 8 is slidably connected with the insertion part 5. The insertion part 5 and the semi-circular indicator 6 are elastically connected by a tension spring 7.

[0023] In this embodiment: please refer to Figure 4 , there is a spacing between the insertion part 5 and the air duct rib plate. The insertion part 5 is inserted into the air duct, the contact ball rod 8 contacts the arc surface of the air duct rib plate, the insertion part 5 enters the designated position in the air duct, the tension spring 7 applies a pulling force to the semi-circular indicator 6, and the contact ball rod 8 always contacts the air duct rib plate. If the position of the heat dissipation hole is qualified and the spacing between the heat dissipation hole and the air duct rib plate is qualified, at this time, the displacement of the two contact ball rods 8 promotes the splicing of the semi-circular indicator 6, and the position of the spliced semi-circular indicator 6 is below the heat dissipation hole. The operator can observe the exposed state of the semi-circular indicator 6 through the heat dissipation hole.

[0024] In this embodiment: when the semi-circular indicator 6 is made of elastic plastic, when the spacing between the hole and the air duct rib plate is narrower than the specified spacing, the two contact ball rods 8 squeeze the semi-circular indicator 6, and the semi-circular indicator 6 will undergo elastic deformation, and the circular semi-circular indicator 6 is converted into an ellipse. When observing the semi-circular indicator 6 through the heat dissipation hole, four hollow areas are generated between the semi-circular indicator 6 and the heat dissipation hole, and the long axis end of the elliptical semi-circular indicator 6 is hidden.

[0025] In this embodiment: If the semi-circular indicator 6 is made of a rigid material, when the distance between the hole and the air duct rib plate is narrower than the specified distance, the insertion part 5 cannot penetrate further into the air duct, and the fitting and surrounding part 2 cannot contact the brake disc either.

[0026] In this embodiment: When the heat dissipation holes deviate from the dispersion curve 100, the circular structure formed by the semi-circular indicator 6 cannot be fully presented in the heat dissipation holes.

[0027] In this embodiment: When the distance between the hole and the air duct rib plate is greater than the specified distance, the tension spring 7 pulls the contact ball rod 8 to fit with the air duct rib plate, and the semi-circular indicator 6 cannot form a closed loop.

[0028] In this embodiment: The rib spacing and height detection assembly includes a fitting and surrounding part 2, an outer rib surface fitting part 3, and an inner rib surface fitting part 4. The arc of the fitting and surrounding part 2 fits with the circumferential surface of the brake disc. The fitting and surrounding part 2 is located between the holding part 1 and the insertion part 5. The outer rib surface fitting part 3 and the inner rib surface fitting part 4 are respectively installed on one side of the fitting and surrounding part 2 close to the brake disc.

[0029] In this embodiment: The purpose of the rib spacing and height detection assembly is to limit the position of the hole position groove wall detection assembly to ensure the alignment of the semi-circular indicator 6 with the heat dissipation holes. Please refer to Figure 3 , the insertion part 5 is inserted into the air duct, and the fitting and surrounding part 2 contacts the circumference of the brake disc. The arc of the fitting and surrounding part 2 is consistent with the arc of the brake disc. After the fitting and surrounding part 2 contacts the brake disc, the insertion part 5 cannot penetrate further. There is a distance between the insertion part 5 and the air duct rib plate, and the fitting and surrounding part 2 will still shake along the arc direction of the brake disc. Therefore, the outer rib surface fitting part 3 and the inner rib surface fitting part 4 are provided.

[0030] In this embodiment: Please refer to Figure 4 , the outer rib surface fitting part 3 and the inner rib surface fitting part 4 respectively contact the outer side surface and the inner side surface of the two air duct rib plates. Under the limitation of the outer rib surface fitting part 3 and the inner rib surface fitting part 4, the fitting and surrounding part 2 cannot shake along the arc surface of the brake disc. And the outer rib surface fitting part 3 and the inner rib surface fitting part 4 can also detect whether the distance between two adjacent air duct rib plates meets the requirements. When the width of two adjacent air duct rib plates is greater than the specified width, the outer rib surface fitting part 3 and the inner rib surface fitting part 4 cannot achieve the limitation. When the width of two adjacent air duct rib plates is narrower than the fixed width, after the outer rib surface fitting part 3 and the inner rib surface fitting part 4 are limited, the fitting and surrounding part 2 can shake along the circumferential direction of the brake disc, so as to determine whether it is qualified.

[0031] In this embodiment: There is a distance between the insertion part 5 and the air duct rib plate. Please refer to Figure 4, the shape of the air duct is curved. If the insertion part 5 matches the shape of the air duct, during the manual operation, the operator needs to control the curved insertion part 5 to enter the air duct. The inner side wall of the air duct is basically not processed by a polishing process, resulting in a rough surface of the air duct rib plate. The resistance for the insertion part 5 to turn into the air duct is large, and the operator also needs to control the insertion part 5 to enter the air duct along the air duct trajectory, making it difficult for the insertion part 5 to enter and increasing the operation burden of the worker. Therefore, there is a spacing between the insertion part 5 and the air duct rib plate, and the trajectory of the insertion part 5 entering the air duct is more diverse, increasing the convenience of the operation. The outer rib curved surface fitting part 3, the inner rib curved surface fitting part 4 and the insertion part 5 cooperate to limit the outer end of the air duct rib plate, which can not only detect whether the spacing of the air duct rib plate is qualified, but also fix the position of the insertion part 5.

[0032] In this embodiment: the outer diameter of the semi-circular indicator 6 is equal to the inner diameter of the brake disc cooling holes. The surface of the semi-circular indicator 6 is provided with a second reference surface 61, and the second reference surface 61 is composed of multiple concentric color bands with different diameters. Please refer to Figure 5 , the second reference surface 61 composed of multiple concentric color bands with different diameters can detect the aperture of the cooling holes. When the aperture of the cooling holes shrinks, the color of the second reference surface 61 exposed in the cooling holes will change.

[0033] In this embodiment: both ends of the outer rib curved surface fitting part 3 and the inner rib curved surface fitting part 4 far away from the fitting and surrounding part 2 have bending parts, and the bending direction of the bending parts is on the side far away from the fitting and surrounding part 2. The bending parts can play a guiding role for the outer rib curved surface fitting part 3 and the inner rib curved surface fitting part 4 to enter the air duct rib plate, enabling the operator to more quickly and accurately achieve the alignment purpose of the outer rib curved surface fitting part 3, the inner rib curved surface fitting part 4 and the air duct rib plate.

[0034] In this embodiment: Teflon films are attached to the opposite sides of the outer rib curved surface fitting part 3 and the inner rib curved surface fitting part 4.

[0035] The outer rib curved surface fitting part 3 and the inner rib curved surface fitting part 4 need to contact the air duct rib plate. Adding Teflon films can reduce the sliding friction between the outer rib curved surface fitting part 3, the inner rib curved surface fitting part 4 and the air duct rib plate. The contact area between the outer rib curved surface fitting part 3, the inner rib curved surface fitting part 4 and the air duct rib plate is small, and the economic loss caused by the wear of the Teflon films is small.

[0036] In this embodiment: the height of the fitting and surrounding part 2 is equal to the thickness of the brake disc. A first reference surface 21 is provided on the side of the fitting and surrounding part 2 close to the brake disc. The thickness of the insertion part 5 is equal to the standard width of the brake disc ventilation slots. The insertion part 5 is a hollow structure, and the contact area between the upper and lower end surfaces of the insertion part 5 and the brake disc surface is reduced, improving the smoothness of insertion. Please refer to Figure 5, the thickness of the insertion part 5 is the thickness along the axial direction of the semi-circular indicator 6. The thickness of the insertion part 5 is the standard width of the air duct. The insertion part 5 cannot enter the air duct, and the actual width of the air duct is lower than the standard width of the air duct. When the insertion part 5 enters the air duct, the fitting and surrounding part 2 is lifted along the axial direction of the semi-circular indicator 6, and the first reference surface 21 is exposed. The actual width of the air duct is higher than the standard width of the air duct. For specific manifestations, please refer to Figure 2 .

[0037] The specific method of this embodiment is as follows: S1: Hold the holding part 1, insert the insertion part 5 into the brake disc heat dissipation channel. There is a distance between the insertion part 5 and the air duct rib plate. The insertion of the insertion part 5 into the brake heat dissipation channel has little resistance. The insertion part 5 can be smoothly inserted into the heat dissipation channel, and the width of the heat dissipation channel is greater than or equal to the thickness of the insertion part 5; S2: Make the fitting and surrounding part 2 contact the arc edge of the brake disc, hold the holding part 1 and shake it along the axial direction of the brake disc, and observe the exposure state of the first reference surface 21. When the first reference surface 21 is exposed, the width of the heat dissipation channel is greater than the thickness of the insertion part 5, and the brake disc channel is unqualified. When there is no exposed color on the first reference surface 21, the brake disc channel is qualified; S3: The outer rib surface fitting part 3 and the inner rib surface fitting part 4 are respectively attached to the outer arc surface and the inner arc surface of the two air duct rib plates. The outer rib surface fitting part 3 and the inner rib surface fitting part 4 limit the insertion part 5 to be in the central state of the brake disc heat dissipation channel. The fitting and surrounding part 2 limits the insertion depth of the insertion part 5 into the brake disc heat dissipation channel. The fitting and surrounding part 2 cannot contact the circumferential surface of the brake disc. When the distance between the two air duct rib plates is greater than the specified standard, when the fitting and surrounding part 2 contacts the circumferential surface of the brake disc and cannot shake along the circumferential surface of the brake disc, the distance between the two air duct rib plates meets the specified standard; S4: The contact ball rod 8 contacts the air duct rib plate, and the tension spring 7 undergoes elastic deformation under the influence of the push of the contact ball rod 8. The two semi-circular indicators 6 move relative to each other. When the distance between the brake disc holes and the air duct rib plates on both sides is qualified, the circular ring formed after the splicing of the second reference surface 61 is exposed through the brake disc heat dissipation holes. When the distance between the brake disc holes and the air duct rib plates on both sides is less than the standard distance, the semi-circular indicators 6 are relatively squeezed and deformed or the fitting and surrounding part 2 cannot contact the arc edge of the brake disc. When the distance between the brake disc holes and the air duct rib plates on both sides is greater than the standard distance, the second reference surface 61 cannot form a closed loop, and the brake disc heat dissipation holes deviate from the dispersion curve 100. Through the brake disc heat dissipation holes, it is observed that the center of the closed loop formed by the second reference surface 61 and the center of the heat dissipation holes are not on the vertical line.

[0038] The above is only the preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any person skilled in the art within the technical scope disclosed by the present invention, according to the technical solution of the present invention and its inventive concept, makes equivalent substitutions or changes, and should be covered by the protection scope of the present invention.

Claims

1. A brake disc inspection tool, characterized in that: Comprising: A gauge body, the gauge body includes a holding portion (1) and an inserting portion (5); A hole position groove wall detection assembly, a plurality of the hole position groove wall detection assemblies are distributed along a dispersion curve (100) in a cavity area of the inserting portion (5), the hole position groove wall detection assembly includes two semi-circular indicators (6) that can be spliced into a circle, a contact ball rod (8) is fixedly connected to an outer arc surface of the semi-circular indicator (6), the contact ball rod (8) is slidably connected to the inserting portion (5), and the inserting portion (5) and the semi-circular indicator (6) are elastically connected by a tension spring (7); A rib spacing and height detection assembly, the rib spacing and height detection assembly includes a fitting and surrounding portion (2), a rib outer curved surface fitting portion (3), and a rib inner curved surface fitting portion (4), the curvature of the fitting and surrounding portion (2) fits the circumferential surface of the brake disc, the fitting and surrounding portion (2) is located between the holding portion (1) and the inserting portion (5), and the rib outer curved surface fitting portion (3) and the rib inner curved surface fitting portion (4) are respectively installed on a side of the fitting and surrounding portion (2) close to the brake disc.

2. The brake disc inspection tool according to claim 1, characterized in that: There is a spacing between the inserting portion (5) and the air duct rib plate.

3. The brake disc inspection tool according to claim 1, characterized in that: The outer diameter of the semi-circular indicator (6) is equal to the inner diameter of the brake disc heat dissipation hole, and a second reference surface (61) is provided on the surface of the semi-circular indicator (6).

4. The brake disc inspection tool according to claim 3, characterized in that: The second reference surface (61) is composed of a plurality of concentric color bands with different diameters.

5. The brake disc inspection tool according to claim 1, characterized in that: One end of the rib outer curved surface fitting portion (3) and the rib inner curved surface fitting portion (4) far from the fitting and surrounding portion (2) both have a bending portion, and the bending direction of the bending portion is on a side away from the fitting and surrounding portion (2).

6. The brake disc inspection tool according to claim 1, wherein: Teflon films are attached to opposite sides of the rib outer curved surface fitting portion (3) and the rib inner curved surface fitting portion (4).

7. The brake disc inspection tool according to claim 1, characterized in that: The height of the fitting and surrounding portion (2) is equal to the thickness of the brake disc, and a first reference surface (21) is provided on a side of the fitting and surrounding portion (2) close to the brake disc.

8. The brake disc inspection tool according to claim 1, characterized in that: The thickness of the inserting portion (5) is equal to the standard width of the brake disc ventilation groove.

9. A detection method for a brake disc gauge according to any one of claims 1-8, characterized in that: S1: Hold the holding portion (1), insert the inserting portion (5) into the brake disc heat dissipation channel. There is a spacing between the inserting portion (5) and the air duct rib plate. The insertion of the inserting portion (5) into the brake heat dissipation channel has little resistance, and the inserting portion (5) can be smoothly inserted into the heat dissipation channel. The width of the heat dissipation channel is greater than or equal to the thickness of the inserting portion (5); S2: The fitting and surrounding portion (2) contacts the arc edge of the brake disc. Hold the holding portion (1) and shake it axially along the brake disc, and observe the exposure state of the first reference surface (21). If the first reference surface (21) is exposed, the width of the heat dissipation channel is greater than the thickness of the inserting portion (5), and the brake disc channel is unqualified. If there is no exposed color on the first reference surface (21), the brake disc channel is qualified; S3: The outer rib surface fitting part (3) and the inner rib surface fitting part (4) are respectively fitted to the outer arc surface and the inner arc surface of the two air duct rib plates. The outer rib surface fitting part (3) and the inner rib surface fitting part (4) limit the placement part (5) to be in the central state of the brake disc heat dissipation channel. The fitting and surrounding part (2) limits the insertion depth of the placement part (5) into the brake disc heat dissipation channel. The fitting and surrounding part (2) cannot contact the circumferential surface of the brake disc. The distance between the two air duct rib plates is greater than the specified standard. When the fitting and surrounding part (2) contacts the circumferential surface of the brake disc and cannot shake along the circumferential surface of the brake disc, the distance between the two air duct rib plates meets the specified standard; S4: The contact ball screw (8) contacts the air duct rib plate. The tension spring (7) undergoes elastic deformation under the pushing influence of the contact ball screw (8). The two semi-circular indicators (6) move relatively. When the distances between the brake disc holes and the two air duct rib plates on both sides are qualified, the circular ring formed by splicing the second reference surfaces (61) is exposed through the brake disc heat dissipation holes. When the distances between the brake disc holes and the two air duct rib plates on both sides are less than the standard distance, the semi-circular indicators (6) are relatively squeezed and deformed or the fitting and surrounding part (2) cannot contact the arc edge of the brake disc. When the distances between the brake disc holes and the two air duct rib plates on both sides are greater than the standard distance, the second reference surfaces (61) cannot form a closed loop. The brake disc heat dissipation holes deviate from the dispersion curve (100). When observing through the brake disc heat dissipation holes, the center of the closed loop formed by the second reference surfaces (61) and the center of the heat dissipation holes are not on the vertical line.

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