Measuring gauge for measuring inner diameter of metro wheel cake

Abstract

The utility model relates to the technical field of train maintenance, in particular to a measuring gauge for measuring the inner diameter of a metro wheel cake. The measuring gauge is arranged on a taper hole and comprises a base, a first protruding part, a second protruding part, a dial indicator, a movable measuring head, a first fastener and a second fastener, the first protruding part and the second protruding part are perpendicularly and fixedly connected to the two ends of the base respectively, and the dial indicator is fixedly connected to the side, close to the second protruding part, of the first protruding part through the first fastener. The movable measuring head penetrates through the second protruding part and is movably connected to the second protruding part through a second fastener, the center axis of the dial indicator and the center axis of the movable measuring head are located on the same straight line, and the end, away from the dial indicator, of the movable measuring head makes contact with the side wall of the taper hole. Compared with the prior art, the wheel cake inner diameter measuring device has the advantages of quickly and accurately measuring the inner diameter of a new wheel cake and the like.

Description

Technical Field

[0001] The utility model relates to the technical field of train maintenance, in particular to a measuring tool for measuring the inner diameter of a subway wheel cake. Background Art

[0002] During the process of subway frame repair and overhaul, the wheel cakes on the subway wheelsets need to be inspected, repaired and replaced; for the wheel cakes that need to be replaced, new wheel cakes need to be purchased for installation. The installation inner diameter of the new wheel cake is a precise size, and it is necessary to detect whether the installation inner diameter size tolerance of the wheel cake meets the technical requirements; because the installation inner diameter of the wheel cake has a taper, the existing measuring tools cannot accurately measure the precise size of the diameter at a specific location. Therefore, how to quickly and accurately measure the inner diameter size of the new wheel cake has become a problem that needs to be solved in this field. Utility Model Content

[0003] The purpose of the utility model is to provide a measuring tool for measuring the inner diameter of a subway wheel cake in order to overcome the defect of the prior art that it is difficult to quickly and accurately measure the inner diameter size of a new wheel cake.

[0004] The purpose of the utility model can be achieved through the following technical solutions:

[0005] The utility model provides a measuring gauge for measuring the inner diameter of a subway wheel cake. The measuring gauge is placed on a tapered hole. The measuring gauge comprises a base, a first protrusion, a second protrusion, a dial gauge, a movable measuring head, a first fastener and a second fastener. The first protrusion and the second protrusion are respectively vertically and fixedly connected to the two ends of the base. The dial gauge is fixedly connected to a side of the first protrusion close to the second protrusion through the first fastener. The movable measuring head passes through the second protrusion and is movably connected to the second protrusion through the second fastener. The central axis of the dial gauge and the central axis of the movable measuring head are located on the same straight line. One end of the movable measuring head away from the dial gauge contacts the side wall of the tapered hole.

[0006] As a preferred technical solution, a first balancing block is fixedly or movably connected to a side of the second protrusion away from the base.

[0007] As a preferred technical solution, a second balancing block is fixedly or movably connected to a side of the first protrusion away from the base.

[0008] As a preferred technical solution, the first protrusion includes a first section and a second section which are perpendicular to each other, the first section is perpendicular to one end of the base, and the second section is placed on the outer surface of the tapered hole.

[0009] As a preferred technical solution, the heights of the first protrusion and the second protrusion are adjusted according to the actual depth of the tapered hole.

[0010] As a preferred technical solution, the first fastener includes a screw.

[0011] As a preferred technical solution, the second fastener includes a screw.

[0012] As a preferred technical solution, the width of the base is adjusted according to the actual aperture size of the tapered hole.

[0013] As a preferred technical solution, the first protrusion is in contact with the outer surface of the tapered hole through a connecting piece.

[0014] As a preferred technical solution, the second protrusion is in contact with the outer surface of the tapered hole through a connecting piece.

[0015] Compared with the prior art, the utility model has the following beneficial effects:

[0016] 1. The utility model utilizes the measuring property of the micrometer and can judge whether the dimension jump meets the tolerance requirement according to the pointer jump of the micrometer. It has a simple structure and is easy to operate. It can quickly check whether the inner diameter of the wheel cake meets the tolerance requirement of the drawing and better measure the inner diameter of the new wheel cake, filling the gap of on-site detection tools and ensuring the quality requirements of on-site operations.

[0017] 2. The central axis of the micrometer in the utility model is kept in the same straight line as the central axis of the movable measuring head. On-site staff will query the dimensional tolerance of the inner diameter of the wheel cake to be measured according to the technical drawings, adjust the movable measuring head, and adjust the measuring range of the gauge to the maximum tolerance of the dimensional base, which can ensure the measurement accuracy and the accuracy of the inner diameter measurement of the wheel cake;

[0018] 3. In the utility model, the heights of the first protrusion and the second protrusion are adjustable, and different internal depths of the tapered hole can be used. The measuring fixture measures the circumferential tolerance of the fixed depth inside the tapered hole to determine whether the tapered hole processing meets the technical requirements. It can quickly determine whether the workpiece size meets the technical requirements, eliminating cumbersome measurement steps, flexible operation, improved efficiency and simplified operation process. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 This is a schematic diagram of the overall structure of the measuring fixture in the embodiment of the utility model;

[0020] Figure 2 This is a schematic diagram of the position of the measuring fixture placed on the tapered hole in the embodiment of the utility model;

[0021] Wherein: 1. base; 2. first protrusion; 3. second protrusion; 4. dial gauge; 5. movable measuring head; 6. first fastener; 7. second fastener; 8. first balancing block. DETAILED DESCRIPTION

[0022] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are part of the embodiments of the utility model, not all of them. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of the utility model.

[0023] In the description of the present utility model, it should be noted that the terms "center", "up", "down", "left", "right", "vertical", "horizontal", "inside", "outside" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, or the positions or positional relationships in which the utility model product is usually placed when in use, which are only for the convenience of describing the present utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific position, be constructed and operated in a specific position, and therefore cannot be understood as a limitation on the present utility model. For example, "horizontal" only means that its direction is more horizontal than "vertical", and does not mean that the structure must be completely horizontal, but can be slightly tilted.

[0024] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of this application, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0025] Example:

[0026] like Figure 1 As shown, this embodiment provides a measuring tool for measuring the inner diameter of a subway wheel cake, which can be placed on a tapered hole. The measuring tool includes a base 1, a first protrusion 2, a second protrusion 3, a micrometer 4, a movable measuring head 5, a first fastener 6 and a second fastener 7.

[0027] The first protrusion 2 and the second protrusion 3 are respectively and vertically and fixedly connected to the two ends of the base 1. The first protrusion 2 includes a first section and a second section that are perpendicular to each other, the first section is perpendicular to the left end of the base 1, and the second section is placed on the outer surface of the tapered hole. The second protrusion 3 also includes two sections that are perpendicular to each other, one of which is perpendicular to the right end of the base 1, and the other section is parallel to the base 1, and one end of the section extends to the left, but does not block the micrometer 4, and the other end extends to the right and is fixedly connected with a first balancing block 8, and the first balancing block 8 and the right extension are placed on the outer surface of the tapered hole. The second section of the first protrusion 2, the first balancing block 8 and the right extension of the second protrusion 3 together enable the entire measuring fixture to be placed on the tapered hole, and by using the first balancing block 8, the center axis of the micrometer 4 and the center axis of the movable measuring head 5 can always be located on the same straight line.

[0028] The micrometer 4 is fixedly connected to the side of the first protrusion 2 close to the second protrusion 3 through the first fastener 6, and the movable measuring head 5 passes through the second protrusion 3 and is movably connected to the second protrusion 3 through the second fastener 7. In this embodiment, the first fastener 6 and the second fastener 7 are both screws. In some other embodiments, other fasteners can also be used to stably fix the micrometer 4 on the first section of the first protrusion 2, and at the same time, the movable measuring head 5 can shorten or extend the length passing through the second protrusion 3.

[0029] The installation process of the aforementioned measuring fixture is as follows:

[0030] Mounting holes are respectively opened in the first section of the first protrusion 2 and the vertical section of the second protrusion 3, and the dial gauge 4 is installed in the mounting hole of the first section, and the dial gauge 4 is firmly fixed by the first fastener 6, that is, the dial gauge 4 is installed on the left side of the base 1. At the same time, the movable measuring head 5 is installed in the mounting hole of the vertical section, and the vertical section and the movable measuring head 5 are movably connected by the second fastener 7, that is, the movable measuring head 5 is installed on the right side of the four-seater 1.

[0031] The operation process of the aforementioned measuring fixture is as follows:

[0032] like Figure 2 As shown, the entire gauge is placed on the tapered hole, and the end of the movable measuring head 5 away from the micrometer 4 contacts the side wall of the tapered hole, which can support one side of the tapered hole. On-site staff will check the dimensional tolerance of the inner diameter of the wheel cake to be measured according to the technical requirements of the drawings, adjust the distance between the movable measuring head 5 and the probe of the micrometer 4, and adjust it to the corresponding size, that is, adjust the measuring range of the gauge to the maximum tolerance of the dimensional base. At the same time, the measuring gauge can be used in conjunction with a micrometer, that is, after adjusting the movable measuring head 5, use a micrometer to re-measure to ensure the dimensional accuracy, that is, to ensure that the adjusted gauge spacing meets the technical requirements.

[0033] Rotate the measuring fixture along the center of the tapered hole and observe the pointer jump of the micrometer 4. According to the pointer jump, compare the dimensional tolerance range on the drawing to determine whether the dimensional jump meets the tolerance requirements, that is, whether the workpiece is qualified. Since the structure to be measured is a tapered hole structure, ordinary diameter measuring instruments cannot accurately measure detailed data; under the condition of meeting the technical requirements of the workpiece, a fixed depth is set, and the gauge measures whether the tolerance jump of the circumference at this fixed depth position meets the technical requirements of the drawing, and the circumferential tolerance at two depth positions on both sides can be measured, which also improves the accuracy of the measurement and ensures that the on-site operation meets the technical requirements.

[0034] In some other embodiments, the first balancing weight 8 can be removed from the right extending portion of the second protrusion 3 .

[0035] In some other embodiments, a second balancing block is fixedly or movably connected to a side of the first protrusion 2 away from the base 1 , and together with the first balancing block 8 , the center axis of the micrometer 4 and the center axis of the movable measuring head 5 are always located on the same straight line.

[0036] In some other embodiments, the height of the first protrusion 2 and the second protrusion 3 can be adjusted according to the actual depth of the tapered hole, and the width of the base 1 can also be adjusted according to the actual aperture size of the tapered hole. The adjustable setting enables the entire measuring fixture to be used for tapered holes of different aperture sizes and depths, thereby improving the scene adaptability of the measuring fixture.

[0037] In some other embodiments, when the first section of the first protrusion 2 and the vertical section of the second protrusion 3 are much higher than the outer surface of the tapered hole, the second section of the first protrusion 2 and the horizontal section of the second protrusion 3 can both contact the outer surface of the tapered hole through the connecting piece.

[0038] The preferred specific embodiments of the utility model are described in detail above. It should be understood that ordinary technicians in this field can make many modifications and changes based on the concept of the utility model without creative work. Therefore, all technical solutions that can be obtained by technicians in this technical field based on the concept of the utility model through logical analysis, reasoning or limited experiments on the basis of the existing technology should be within the scope of protection determined by the claims.

Claims

1. A measuring tool for measuring the inner diameter of a subway wheel, the measuring tool being placed on a tapered hole, characterized in that: The measuring gauge comprises a base, a first protrusion, a second protrusion, a dial gauge, a movable measuring head, a first fastener and a second fastener, wherein the first protrusion and the second protrusion are respectively vertically and fixedly connected to two ends of the base, the dial gauge is fixedly connected to a side of the first protrusion close to the second protrusion through the first fastener, the movable measuring head passes through the second protrusion and is movably connected to the second protrusion through the second fastener, the central axis of the dial gauge and the central axis of the movable measuring head are located on the same straight line, and one end of the movable measuring head away from the dial gauge contacts the side wall of the tapered hole.

2. The measuring tool for measuring the inner diameter of a subway wheel according to claim 1, characterized in that: A first balancing block is fixedly or movably connected to a side of the second protrusion away from the base.

3. The measuring tool for measuring the inner diameter of a subway wheel according to claim 2, characterized in that: A second balancing block is fixedly or movably connected to a side of the first protrusion away from the base.

4. The measuring tool for measuring the inner diameter of a subway wheel according to claim 2, characterized in that: The first protrusion includes a first section and a second section which are perpendicular to each other, the first section is perpendicular to one of the ends of the base, and the second section is disposed on the outer surface of the tapered hole.

5. The measuring tool for measuring the inner diameter of a subway wheel according to claim 1, characterized in that: The heights of the first protrusion and the second protrusion are adjusted according to the actual depth of the tapered hole.

6. The measuring tool for measuring the inner diameter of a subway wheel according to claim 1, characterized in that: The first fastener comprises a screw.

7. The measuring tool for measuring the inner diameter of a subway wheel according to claim 1, characterized in that: The second fastener comprises a screw.

8. The measuring tool for measuring the inner diameter of a subway wheel according to claim 1, characterized in that: The width of the base is adjusted according to the actual aperture size of the tapered hole.

9. The measuring tool for measuring the inner diameter of a subway wheel according to claim 1, characterized in that: The first protrusion is in contact with the outer surface of the tapered hole through a connecting piece.

10. The measuring tool for measuring the inner diameter of a subway wheel according to claim 1, characterized in that: The second protrusion is in contact with the outer surface of the tapered hole through a connecting piece.

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