Special-shaped digital caliper for measuring outer diameter of wheel hub of railway vehicle

Abstract

The utility model belongs to the technical field of measuring devices, and particularly relates to a special-shaped digital display caliper for measuring the outer diameter of a wheel hub of a railway vehicle, which comprises a main caliper, a caliper frame is arranged on the main caliper in a sliding manner, and a digital display mechanism for displaying and processing measured data is mounted on the caliper frame. Outer measurement connecting blocks are fixedly arranged at the left lower end of the main ruler and the left lower end of the ruler frame, positioning blocks are fixedly arranged at the lower ends of the outer measurement connecting blocks, the lower surfaces of the positioning blocks serve as horizontal reference surfaces and are used for making contact with the upper end face of a hub, and clamping blocks are integrally arranged on the outer sides of the lower surfaces of the positioning blocks and are used for clamping the hub. A measuring claw is arranged at the lower part of the inner side surface of the clamping block and is used for being in contact with the outer circumferential surface of the hub; the measuring tool can be used for measuring any vehicle type, is low in purchase cost, can be used for process monitoring as a numerical measuring tool, and is favorable for improving the product quality.

Description

Technical Field

[0001] This utility model belongs to the field of measuring device technology, specifically relating to a special-shaped digital caliper for measuring the outer diameter of the wheel hub of a railway vehicle. Background Technology

[0002] After railway vehicle wheels are manufactured, they need to be inspected to see if they meet the required standards. The hub structure of railway vehicle wheels is as follows: Figure 1 As shown, because the end face edge of the wheel hub is chamfered, it cannot be directly measured. In existing technology, a template is used for inspection, such as... Figure 2 As shown, sample testing has advantages such as simple operation, high efficiency and convenient use, but it also has many disadvantages, such as long sample production cycle, high procurement cost, and the need to manufacture special samples for testing each type of railway vehicle wheel. Moreover, it can only judge whether it is qualified or not, but cannot obtain specific data, which is not conducive to quality control. Utility Model Content

[0003] This invention addresses the aforementioned problems by providing a non-standard digital caliper for measuring the outer diameter of railway vehicle wheel hubs.

[0004] To achieve the above objectives, the present invention adopts the following technical solution:

[0005] A special-shaped digital caliper for measuring the outer diameter of railway vehicle wheel hubs includes a main scale, a frame slidably mounted on the main scale, a digital display mechanism for displaying and processing measurement data mounted on the frame, an outer measuring connecting block fixedly mounted at the lower left end of both the main scale and the frame, a positioning block fixedly mounted at the lower end of the outer measuring connecting block, the lower surface of the positioning block serving as a horizontal reference surface for contacting the upper end surface of the wheel hub, a clamping block integrally mounted on the outer side of the lower surface of the positioning block, and a measuring claw mounted on the lower part of the inner side of the clamping block for contacting the outer circumferential surface of the wheel hub.

[0006] Furthermore, the cross-section of the measuring claw is semi-circular to reduce wear on the measuring claw and prevent scratching the wheel hub.

[0007] Furthermore, a calibration surface is provided on the inner side of the positioning block to assist in zeroing the digital caliper.

[0008] Furthermore, the width of the positioning block, clamping block, and measuring claw is 20-25mm.

[0009] Compared with the prior art, the present invention has the following advantages:

[0010] This invention establishes a horizontal reference plane for positioning the digital caliper. Based on this horizontal reference plane positioning, it uses measuring jaws to measure the dimensional error at the contact point between the wheel hub and the measuring jaws. Without considering wheel hub shape errors, the dimensional error at the measuring jaws reflects the wheel hub diameter error. Compared to template inspection, this invention can measure any vehicle model, has low procurement costs, and as a numerical measuring tool, it can be used for process monitoring, which is beneficial to improving product quality. Attached Figure Description

[0011] Figure 1 This is a schematic diagram of the wheel hub structure;

[0012] Figure 2 This is a schematic diagram of the structure used for testing with a template;

[0013] Figure 3 This is a schematic diagram of the structure of Embodiment 1 of the present utility model;

[0014] In the diagram, the main scale is 1, the scale frame is 2, the digital display mechanism is 3, the external measuring connecting block is 4, the positioning block is 5, the horizontal reference surface is 6, the clamping block is 7, the measuring claw is 8, and the calibration surface is 9. Detailed Implementation

[0015] To further illustrate the technical solution of this utility model, the following embodiments will be used to further explain this utility model.

[0016] like Figure 3 As shown, a non-standard digital caliper for measuring the outer diameter of railway vehicle wheel hubs includes a main scale 1, a frame 2 slidably mounted on the main scale 1, a digital display mechanism 3 for displaying and processing measurement data mounted on the frame 2, an outer measuring connecting block 4 fixedly mounted at the lower left end of both the main scale 1 and the frame 2, a positioning block 5 fixedly mounted at the lower end of the outer measuring connecting block 4, a calibration surface 9 provided on the inner side of the positioning block 5 for assisting in zeroing the digital caliper, and the lower surface of the positioning block 5 serving as a horizontal reference surface 6 for contacting the upper end surface of the wheel hub. A clamping block 7 integrally mounted on the outer side of the lower surface of the positioning block 5, and a measuring claw 8 provided on the lower part of the inner side of the clamping block 7 for contacting the outer circumferential surface of the wheel hub. The measuring claw 8 has a semi-circular cross-section to reduce wear on the measuring claw 8 and prevent scratching the wheel hub. The widths of the positioning block 5, clamping block 7, and measuring claw 8 are all 20-25 mm. By widening the positioning block 5, clamping block 7, and measuring claw 8, the diameter can be accurately measured every time, thus improving measurement accuracy.

[0017] Instructions for use: Before measurement, first align the calibration surface 9 on the inner side of the positioning block 5, then press the reset button on the digital display mechanism 3 to zero the value. After that, align the horizontal reference surface 6 with the upper end face of the hub and measure the diameter at the contact position of the hub with the measuring claw 8 to obtain the measured value a. a+b gives the actual diameter c at the contact position of the hub with the measuring claw 8, b is the distance between the two measuring claws 8 when the two calibration surfaces 9 are aligned, cd gives the error value e, and d is the designed diameter at the contact position of the hub with the measuring claw 8. The obtained error value e reflects the diameter error of the hub.

[0018] The foregoing has shown and described the main features and advantages of this utility model. It will be apparent to those skilled in the art that this utility model is not limited to the details of the exemplary embodiments described above, and that it can be implemented in other specific forms without departing from the spirit or essential characteristics of this utility model. Therefore, the embodiments should be considered exemplary and non-limiting in all respects. The scope of this utility model is defined by the appended claims rather than the foregoing description, and thus all variations falling within the meaning and scope of equivalents of the claims are intended to be included within this utility model.

[0019] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A special-shaped digital caliper for measuring the outer diameter of railway vehicle wheel hubs, comprising a main scale (1), a scale frame (2) slidably disposed on the main scale (1), and a digital display mechanism (3) for displaying and processing measurement data mounted on the scale frame (2), characterized in that: An external measuring connecting block (4) is fixedly installed at the lower left end of the main scale (1) and the scale frame (2). A positioning block (5) is fixedly installed at the lower end of the external measuring connecting block (4). The lower surface of the positioning block (5) serves as a horizontal reference surface (6) for contacting the upper end surface of the hub. A clamping block (7) is integrally installed on the outer side of the lower surface of the positioning block (5). A measuring claw (8) is installed at the lower part of the inner side of the clamping block (7) for contacting the outer circumferential surface of the hub.

2. The irregular-shaped digital caliper for measuring the outer diameter of railway vehicle wheel hubs according to claim 1, characterized in that: The measuring claw (8) has a semi-circular cross-section to reduce wear on the measuring claw (8) and prevent scratching the hub.

3. A special-shaped digital caliper for measuring the outer diameter of railway vehicle wheel hubs according to claim 1, characterized in that: A calibration surface (9) is provided on the inner side of the positioning block (5) to assist in zeroing the digital caliper.

4. A special-shaped digital caliper for measuring the outer diameter of railway vehicle wheel hubs according to claim 1, characterized in that: The width of the positioning block (5), clamping block (7) and measuring claw (8) is 20-25mm.

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