Clamp for measuring coaxiality of brake product

Abstract

The utility model relates to a fixture for measuring coaxiality of a brake product, which comprises a bottom plate and a dial indicator and is characterized in that a bearing seat is arranged on the bottom plate, a bearing is arranged in the bearing seat, a positioning shaft is fixed on an inner ring of the bearing, and the center line of the positioning shaft is perpendicular to the horizontal plane. The positioning shaft is composed of a lower narrow-diameter shaft section connected with a bearing inner ring and an upper expanding-diameter shaft section connected with the upper end of the lower narrow-diameter shaft section, a conical groove with the wide upper portion and the narrow lower portion is formed in the center of the upper surface of the upper expanding-diameter shaft section, a conical tooth structure is arranged on the inner side wall of the conical groove, a concentric receding groove is formed in the bottom face of the conical groove, and a support is fixed to the portion, on the side of the bearing seat, of the bottom plate. The upper end of the support is provided with an X-direction horizontal through hole and a Y-direction hole communicated with the X-direction horizontal through hole, a shaft tube of the dial indicator is inserted into the X-direction horizontal through hole and is positioned through a positioning bolt located in the Y-direction hole, and a measuring head of the dial indicator points to the center line of the conical groove. The fixture solves the problem that the coaxiality of the guide nut is inconvenient to detect, time and labor are saved, and the detection precision is high.

Description

Technical Field

[0001] The utility model relates to the technical field of braking product testing tooling, and particularly relates to a coaxiality fixture for braking products, which is applicable to the coaxiality detection of guide nuts. Background Art

[0002] The ST2-250 type two-way brake shoe clearance adjuster of railway freight cars is installed between the front and rear brake levers of the vehicle. By shortening and extending itself, it adjusts the clearance between the brake shoe and the wheel, and can eliminate the change of the clearance between the brake shoe and the wheel caused by the wear of parts such as the brake shoe and the wheel and the replacement of the brake shoe during the operation of the vehicle, so that the piston stroke of the brake cylinder is kept within the specified range, ensuring that the vehicle has sufficient braking force and running safely. The guide nut is an important part of the above two-way brake shoe clearance adjuster, which affects whether the adjuster can work properly. The guide nut has a round shaft section and a bevel gear section, which is not convenient for coaxiality detection. Content of the Utility Model

[0003] The purpose of the utility model is to provide a coaxiality fixture for braking products with reasonable structure and reliable use, to solve the problem that the coaxiality detection of the guide nut is not convenient, which saves time and effort and has high detection accuracy.

[0004] The technical solution of the utility model is as follows:

[0005] A coaxiality fixture for braking products, including a bottom plate and a dial indicator. The technical key points are: a bearing seat is arranged on the bottom plate, a bearing is arranged in the bearing seat, a positioning shaft is fixed in the inner ring of the bearing, the center line of the positioning shaft is perpendicular to the horizontal plane, the positioning shaft is composed of a lower narrow-diameter shaft section connected to the inner ring of the bearing and an upper expanded-diameter shaft section connected to the upper end of the lower narrow-diameter shaft section. The center of the upper surface of the upper expanded-diameter shaft section is provided with a tapered groove with a wide upper part and a narrow lower part. The inner side wall of the tapered groove is provided with a bevel gear structure, and the bottom surface of the tapered groove is provided with a concentric avoidance groove. The bottom plate is fixed with a bracket on the side of the bearing seat. The upper end of the bracket is provided with an X-direction horizontal through hole and a Y-direction hole communicated with the X-direction horizontal through hole. The shaft tube of the dial indicator is inserted into the X-direction horizontal through hole and positioned by a positioning bolt located in the Y-direction hole. The measuring head of the dial indicator points to the center line of the tapered groove.

[0006] For the above coaxiality fixture for braking products, the bevel gear structure is a 60-tooth bevel gear.

[0007] For the above coaxiality fixture for braking products, the bracket is a lifting bracket.

[0008] For the above coaxiality fixture for braking products, the bearing is a deep groove ball bearing with a dust cover.

[0009] The beneficial effects of the utility model are:

[0010] The conical groove of the positioning shaft and the cone tooth structure on its inner side wall are used to position the workpiece to be detected, namely the guiding nut, to prevent the workpiece from moving left and right or rotating during the detection process. After the measuring head of the dial indicator contacts the workpiece, zero adjustment is made. Then, the positioning shaft is pushed, and the bearing drives the workpiece to rotate. The reading of the dial indicator is read to measure the coaxiality of the workpiece. This fixture has a simple structure, is convenient to operate, has accurate positioning, high detection accuracy, saves time and effort, significantly improves the detection efficiency, and at the same time avoids the influence of human negligence on the product quality. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] Figure 1 is a schematic structural diagram of the present utility model;

[0012] Figure 2 is Figure 1 the top view of

[0013] Figure 3 is Figure 1 the top view of the positioning shaft in

[0014] In the figure: 1. Base plate, 2. Bearing seat, 3. Positioning shaft, 301. Cone tooth structure, 302. Concentric avoidance groove, 303. Conical groove, 4. Bearing, 5. Bracket, 6. Dial indicator, 7. Positioning bolt, 8. Guiding nut. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0015] The present utility model will be described in detail according to the accompanying drawings of the specification.

[0016] As Figures 1 to 3 shown, this fixture for measuring the coaxiality of the brake product includes a base plate 1 and a dial indicator 6.

[0017] Among them, a bearing seat 2 is arranged on the base plate 1, a bearing 4 is arranged in the bearing seat 2, and a positioning shaft 3 is fixed in the inner ring of the bearing 4. The center line of the positioning shaft 3 is perpendicular to the horizontal plane. The positioning shaft 3 is composed of a lower narrow-diameter shaft section connected to the inner ring of the bearing 4 and an upper expanded-diameter shaft section connected to the upper end of the lower narrow-diameter shaft section. A conical groove 303 with a wide upper part and a narrow lower part is arranged at the center of the upper surface of the upper expanded-diameter shaft section. The inner side wall of the conical groove 303 is provided with a cone tooth structure 301, and a concentric avoidance groove 302 is arranged at the bottom surface of the conical groove 303. A bracket 5 is fixed on the base plate 1 on the side of the bearing seat 2. The upper end of the bracket 5 is provided with an X-direction horizontal through hole and a Y-direction hole communicating with the X-direction horizontal through hole. The shaft tube of the dial indicator 6 is inserted into the X-direction horizontal through hole and is positioned by a positioning bolt 7 located in the Y-direction hole. The measuring head of the dial indicator 6 points to the center line of the conical groove 303.

[0018] In this embodiment, the cone tooth structure 301 is a 60-tooth cone tooth. The bearing 4 is a deep groove ball bearing with a dust cover. The bracket 5 is a fixed frame structure and can also be made into a lifting frame to facilitate adjusting the measuring height.

[0019] During assembly, the hole of the base 1 is in interference fit with the bearing housing 2, the bearing housing 2 is in interference fit with the bearing 4, and the positioning shaft 3 is in interference fit with the bearing 4.

[0020] During use, place the guiding nut 8 of the workpiece to be detected in the tapered groove 303 of the positioning shaft 3. The tapered tooth section of the guiding nut 8 is engaged with the tapered tooth structure 301 on the inner side wall of the tapered groove to achieve the positioning of the guiding nut 8. Install the dial indicator 6 on the bracket 5. After the measuring head of the dial indicator 6 contacts the round shaft section of the guiding nut 8, zero it. Push the upper enlarged diameter shaft section of the positioning shaft 3, and the bearing 4 drives the guiding nut 8 to rotate. At this time, observe and read the reading of the dial indicator 6 to measure the coaxiality of the workpiece.

[0021] The above has described the embodiments of the present invention in detail, but the above content is only the preferred embodiments of the present invention and cannot be considered as limiting the scope of implementation of the present invention. All equivalent changes and improvements made within the scope of the creation of the present invention shall still fall within the scope covered by this patent.

Claims

1. A coaxiality measuring fixture for a braking product, comprising a bottom plate and a dial indicator, characterized in that: A bearing seat is arranged on the bottom plate. A bearing is arranged in the bearing seat. A positioning shaft is fixed to the inner ring of the bearing. The central axis of the positioning shaft is perpendicular to the horizontal plane. The positioning shaft is composed of a lower narrow-diameter shaft section connected to the inner ring of the bearing and an upper expanded-diameter shaft section connected to the upper end of the lower narrow-diameter shaft section. A tapered groove with a wide upper part and a narrow lower part is arranged at the center of the upper surface of the upper expanded-diameter shaft section. A tapered tooth structure is arranged on the inner side wall of the tapered groove. A concentric avoidance groove is arranged at the bottom surface of the tapered groove. A bracket is fixed to the side of the bearing seat on the bottom plate. An X-direction horizontal through hole and a Y-direction hole communicated with the X-direction horizontal through hole are arranged at the upper end of the bracket. The shaft tube of the dial indicator is inserted into the X-direction horizontal through hole and positioned by a positioning bolt located in the Y-direction hole. The measuring head of the dial indicator points to the central line of the tapered groove.

2. The coaxiality measuring fixture for the braking product according to claim 1, characterized in that: The tapered tooth structure is a 60-tooth tapered tooth.

3. The coaxiality measuring fixture for the braking product according to claim 1, characterized in that: The bracket is a lifting bracket.

4. The coaxiality measuring fixture for the braking product according to claim 1, wherein: The bearing is a deep groove ball bearing with a dust cover.

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