A motor train unit running gear wearing part auxiliary measurement tool

Abstract

The utility model provides a kind of EMU running gear wearing part auxiliary measurement tool, belong to rail transit vehicle maintenance detection technical field. Including main body measurement part, the two sides of the one end of this main body measurement part extend upwards and form dog measurement part, main body measurement part is made of two parallelly arranged detection surfaces, the height of two detection surfaces is different. When detection surface is contacted with brake pad, operator can judge whether wearing is over standard by observing contact state. Upwardly extended dog measurement part can be inserted into the gap between grinding piece and mounting seat, and whether the thickness of grinding piece meets the requirement is judged using gap width. The integrated design of main body and dog makes measurement action complete once, without changing tool. By integrating double detection surface and dog structure, twice measurement is combined into single operation, solve the technical problems that traditional tool is inconvenient to operate in narrow space, low efficiency and easy to cause component loosening, have the advantages of improving measurement accuracy and operation efficiency, reducing security risk.

Description

Technical Field

[0001] This utility model belongs to the field of rail transit vehicle maintenance and testing technology, specifically relating to an auxiliary measuring tool for wear parts of the running gear of a high-speed train. Background Technology

[0002] In the daily maintenance and repair of high-speed trains, the measurement of brake pad and grinding wheel dimensions is a crucial step, as its accuracy directly affects the safety and stability of the train's operation. However, the conventional tools and operating methods currently used for this task present numerous challenges for the operators.

[0003] Currently, the commonly used tools for measuring the dimensions of brake pads and grinding wheels are steel rulers, grinding rulers, and flashlights. While these tools may meet basic measurement needs under normal conditions, they reveal significant inadequacies in actual high-speed train maintenance scenarios. The space between the bogie and the car body of a high-speed train is extremely confined, severely restricting the physical movement of personnel during measurements. Moreover, the poor lighting conditions in this area undoubtedly increase the difficulty of accurate measurements.

[0004] To ensure measurement accuracy, workers have to insert most of their bodies between the train's bogie and the car body. To guarantee the accuracy of the measurement results, workers often need to spend several minutes repeatedly measuring and confirming the information.

[0005] Furthermore, the repeated grinding wheel measurement work poses potential safety hazards. In the confined space, when workers use a steel ruler for measurement, accidental contact with the grinding wheel mounting base is unavoidable. Due to the special structure and installation method of the mounting base, such accidental contact could easily cause the grinding wheel to loosen or even fall off. If the grinding wheel falls off during train operation, it will seriously threaten train safety. Simultaneously, if workers cannot obtain accurate readings, they may fail to detect abnormal wear on the brake pads or grinding wheels in a timely manner, thus hindering timely replacement or repair, which also presents a significant safety risk.

[0006] In summary, existing methods for measuring the dimensions of brake pads and grinding discs face numerous challenges in terms of measurement accuracy, operational efficiency, and safety. To address these issues, the development of more advanced, applicable, and safer measuring tools and methods is urgently needed, which is of great significance for improving the quality of EMU maintenance and ensuring the safe operation of EMUs. Utility Model Content

[0007] The purpose of this invention is to overcome the problems of low measurement accuracy and low work efficiency in the existing measurement of brake pads and grinding tools, and to provide an auxiliary measuring tool for wear parts of the running gear of EMU trains.

[0008] To achieve the above objectives, the present invention adopts the following technical solution:

[0009] In the first aspect, this utility model provides an auxiliary measuring fixture for wear parts of the running gear of a high-speed train, including a main measuring part, with two sides of one end of the main measuring part extending upward to form a claw measuring part, the main measuring part being composed of two parallel detection surfaces with different heights.

[0010] The main measuring unit includes a first detection surface and a second detection surface, and the first detection surface and the second detection surface have different thicknesses.

[0011] The two detection surfaces of the main measuring unit measure the thickness of the brake pads of the EMU.

[0012] The thickness of the two detection surfaces of the main measuring unit corresponds to the minimum permissible wear limit of brake pads for different models of EMU trains.

[0013] The connection between the first detection surface and the second detection surface is a seam, dividing the main measurement part into two symmetrical parts.

[0014] The jaw measuring unit includes two parallel jaws with a gap between them, used to measure the thickness of the grinding stone.

[0015] The thickness of the top of the claw is less than the thickness of the bottom.

[0016] The measuring fixture is manufactured as a single piece.

[0017] The surface of the measuring fixture is treated for rust prevention and wear resistance.

[0018] The edges of the measuring fixture are rounded.

[0019] Compared with the prior art, the present invention has the following beneficial effects:

[0020] This utility model provides an auxiliary measuring fixture for wear parts of a high-speed train's running gear. It includes a main measuring section, with two upward-extending sides at one end forming a claw measuring section. The main measuring section consists of two parallel detection surfaces at different heights. When the detection surfaces contact the brake pads, the operator can determine whether the wear exceeds the standard by observing the contact state. The upward-extending claw measuring section can be inserted into the gap between the grinding tool and the mounting base, and the gap width can be used to determine whether the thickness of the grinding tool meets the requirements. The integrated design of the main body and the claws allows the measurement action to be completed in one step without changing tools. By integrating the dual detection surfaces and the claw structure, two measurements are combined into a single operation, solving the technical problems of inconvenience, low efficiency, and easy loosening of components caused by traditional tools in confined spaces. This offers advantages such as improved measurement accuracy and work efficiency, and reduced safety hazards.

[0021] Furthermore, the thickness of the two detection surfaces corresponds to the minimum permissible wear limit of brake pads for different models of EMU trains. Existing technology requires repeated readings and comparison with standard values ​​when using a steel ruler for measurement. However, this solution simplifies the measurement action to a single-contact comparison by using a detection surface with a pre-set thickness benchmark, avoiding reading errors caused by limited space or insufficient light, and eliminating the need for repeated adjustments to the measurement position. Attached Figure Description

[0022] Figure 1 This is a front view of the tooling structure of this utility model;

[0023] Figure 2 This is a rear view of the tooling structure of this utility model;

[0024] Figure 3 This is a schematic diagram of the measuring brake plate of the tooling of this utility model;

[0025] Figure 4 This is a schematic diagram of the tooling for measuring the grinding wheel of this utility model;

[0026] The following are the annotations in the figure: 1. Main measuring part; 2. Claw measuring part; 3. First detection surface; 4. Second detection surface; 5. Claw. Detailed Implementation

[0027] The technical solutions of this application will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are merely some embodiments of this application, and not all embodiments. The components of this application described and shown in the accompanying drawings can generally be arranged and designed in various different configurations. Therefore, the following detailed description of the embodiments of this application provided in the accompanying drawings is not intended to limit the scope of the claimed application, but merely to illustrate selected embodiments of this application. All other embodiments obtained by those skilled in the art based on the embodiments of this application without inventive effort are within the scope of protection of this application.

[0028] It should be noted that similar reference numerals and letters in the following figures indicate similar items; therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures. Furthermore, in the description of this application, terms such as "first," "second," etc., are used only to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0029] like Figures 1-2 As shown, an auxiliary measuring fixture for wear parts of a high-speed train running gear has the following structural components:

[0030] A tooling for auxiliary measurement of wear parts of a high-speed train running gear includes a main measuring part 1. The two sides of one end of the main measuring part 1 extend upward to form a claw measuring part 2. The main measuring part consists of two parallel detection surfaces with different heights.

[0031] Specifically, the main measuring unit 1 can be formed into two independent detection surfaces by processing a split metal block. Different measurement references are distinguished by a stepped height difference. The detection surface refers to the measurement reference surface that is in direct contact with the surface of the brake pad. Specifically, it can be formed into a flat working surface by precision grinding. The brake pad thickness data is obtained through contact measurement.

[0032] The main measuring unit 1 includes a first detection surface 3 and a second detection surface 4. The two detection surfaces are machined to a thickness that matches the minimum permissible wear limit of the brake pads for two different vehicle models. When it is necessary to detect the wear level of the brake pad, the operator places the detection surface in contact with the brake pad surface. If the remaining thickness of the brake pad is lower than the thickness of the corresponding detection surface, it indicates that the brake pad has reached the replacement standard. Since the thickness of the detection surface directly corresponds to the safety threshold, the judgment can be made without relying on manual readings or multiple measurements.

[0033] Preferably, the junction of the first detection surface 3 and the second detection surface 4 is a seam, dividing the main measuring part into two symmetrical parts. The seam is achieved using a linear transition structure formed by machining, which maintains the independence of the detection surfaces while forming the integrity of the overall structure. The two symmetrical parts refer to the mirror-symmetrical structure of the main measuring part along the seam axis, which can be achieved by machining the symmetrical contours using a CNC machine tool. This symmetry gives the measuring fixture bidirectional operational adaptability in narrow spaces.

[0034] When measuring brake pad thickness, the symmetrical structure of the main measuring unit 1 allows operators to perform bidirectional measurements without adjusting the tooling orientation. The joint structure maintains the independent function of the two detection surfaces while forming a natural boundary marker line, allowing operators to quickly locate the measurement reference point by touch in dimly lit environments. The symmetrically distributed detection surfaces evenly distribute contact stress when accidentally bumping into the mounting base, preventing localized stress that could lead to structural deformation.

[0035] In a preferred embodiment, the main measuring part 1 is approximately 55mm long and 18mm wide; the first measuring surface 3 is 5.5mm thick and is used to assist in measuring the thickness of the brake pads of CRH380AL and CRH380B(L) type EMUs; the second measuring surface 4 is 6.5mm thick and is used to assist in measuring the thickness of the brake pads of CRH2G and CR300BF type EMUs.

[0036] Furthermore, the jaw measuring unit 2 refers to the clamping structure extending from the main body when measuring the thickness of the brake pad. It can adopt a symmetrically distributed cantilevered boss structure, and its gap width can be set slightly larger than the thickness of the measured part to achieve guiding positioning. Parallel jaws mean that the axes of the two jaws 5 are kept parallel. Specifically, this can be achieved through CNC machining to ensure dimensional tolerances, keeping the parallelism error of the two jaws 5 within the required measurement accuracy range. The gap formed on the inner sides of the two jaws is set to the lower limit threshold of the standard thickness value of the grinding disc. During measurement, the grinding disc is directly placed into the gap formed by the two jaws 5. When the grinding disc can fully enter the gap without resistance, it indicates that its thickness has not exceeded the allowable wear limit; if it cannot fully enter the gap, it is determined that the thickness exceeds the safe range and needs to be replaced. This measurement method does not require manual reading; rapid judgment is achieved through the physical limitation of the gap. The parallel structure of the jaws ensures uniform force on the contact surface during measurement, avoiding misjudgment due to tilting.

[0037] Preferably, the thickness of the top of the jaw 5 is less than the thickness of the bottom, allowing for easier insertion into narrow spaces when measuring the thickness of the grinding wheel. When the jaw extends into the gap of the grinding wheel mounting base, the thinner top portion preferentially contacts the measuring surface, avoiding interference with surrounding components. The thicker bottom portion provides stable support for the measuring reference surface, ensuring that the jaw 5 does not deform under stress.

[0038] In a preferred embodiment, the jaws 5 of the jaw measuring unit 2 are 10mm long, and the gap between the two jaws 5 is 14mm, used to assist in measuring the thickness of the grinding wheel for each vehicle model, with a 1mm margin reserved. The thickness of the jaws 5 is 2mm. The physical model is made of aluminum alloy with a machining accuracy of 0.01mm. Stainless steel will be used for mass production to increase wear resistance and durability.

[0039] Preferably, the measuring fixture is integrally machined. This integral machining process eliminates gaps between the jaw measuring section and the main measuring section, ensuring a continuous and flat measuring reference surface that can be directly fitted to the brake pad surface for stable measurement. The fixture's shape and functional structure are formed in a single step using precision machining equipment during manufacturing, avoiding any impact on measurement accuracy from subsequent assembly processes.

[0040] Preferably, the surface of the measuring fixture is treated with rust prevention and wear resistance. Within the narrow space between the bogie and the car body of a high-speed train, the measuring fixture operates in a humid and dusty environment for extended periods, making its surface susceptible to corrosion and mechanical wear. Rust prevention prevents direct contact between the metal substrate and the environmental medium, avoiding dimensional deviations caused by corrosion; wear resistance treatment increases surface hardness, reducing scratches or deformation caused by repeated measurement operations, thereby maintaining the geometric accuracy of the measurement reference surface.

[0041] Preferably, the edges of the measuring tool surface are rounded. This can be achieved through mechanical grinding, CNC milling, or stamping. Within the limited working space between the bogie and the car body of the EMU, the rounded transition structure of the tool's edges reduces contact stress with components such as grinding tools. When the tool accidentally collides with surrounding components, the rounded edges disperse the contact force, preventing localized stress concentration that could cause component deformation or detachment, while also reducing wear on the tool itself due to impacts.

[0042] Example 2

[0043] like Figures 3-4 As shown, an auxiliary measuring fixture for wear parts of a high-speed train running gear is described below, and its working method is as follows:

[0044] When measuring brake pads, the bottom of the tool should be placed in complete contact with the surface of the brake disc, with the tool pressed against the thinnest part of the brake pad. If the back plate of the friction body is lower than the thickness of the tool, it can help the operator determine that the brake pad has reached its wear limit. If the back plate of the friction body is higher than the thickness of the tool, it can help the operator determine that the brake pad has not reached its wear limit.

[0045] When measuring the grinding wheel, the inner side of one of the jaws should be placed against the outer side of the steel back, and the other side should be aligned with the thinnest part of the grinding wheel. When the grinding wheel can be held in the middle of the gap by the jaws, it can help the operator to judge that the grinding wheel has reached its wear limit. When the grinding wheel cannot be held in the middle of the gap by the jaws, it can help the operator to judge that the grinding wheel has not reached its wear limit.

[0046] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of this utility model and not to limit it. Although the utility model has been described in detail with reference to the above embodiments, those skilled in the art should understand that modifications or equivalent substitutions can still be made to the specific implementation of this utility model. Any modifications or equivalent substitutions that do not depart from the spirit and scope of this utility model should be covered within the protection scope of the claims of this utility model.

Claims

1. An auxiliary measuring fixture for wear parts of the running gear of a high-speed train, characterized in that, It includes a main measuring part (1), and two sides of one end of the main measuring part (1) extend upward to form a claw measuring part (2). The main measuring part (1) is composed of two parallel detection surfaces with different heights.

2. The auxiliary measuring fixture for wear parts of the running gear of a high-speed train according to claim 1, characterized in that, The main measuring part (1) includes a first detection surface (3) and a second detection surface (4), and the first detection surface (3) and the second detection surface (4) have different thicknesses.

3. The auxiliary measuring fixture for wear parts of the running gear of a high-speed train according to claim 2, characterized in that, The two detection surfaces of the main measuring unit (1) measure the thickness of the brake pads of the EMU.

4. The auxiliary measuring fixture for wear parts of the running gear of a high-speed train according to claim 3, characterized in that, The thickness of the two detection surfaces of the main measuring part (1) corresponds to the minimum allowable wear limit of the brake pads of different models of EMU trains.

5. The auxiliary measuring fixture for wear parts of the running gear of a high-speed train according to claim 2, characterized in that, The connection between the first detection surface (3) and the second detection surface (4) is a seam, which divides the main measuring part (1) into two symmetrical parts.

6. The auxiliary measuring fixture for wear parts of the running gear of a high-speed train according to claim 1, characterized in that, The jaw measuring part (2) includes two parallel jaws (5) with a gap between them for measuring the thickness of the grinding stone.

7. The auxiliary measuring fixture for wear parts of the running gear of a high-speed train according to claim 6, characterized in that, The thickness of the top of the claw (5) is less than the thickness of the bottom.

8. The auxiliary measuring fixture for wear parts of the running gear of a high-speed train according to claim 1, characterized in that, The measuring fixture is manufactured as a single piece.

9. The auxiliary measuring fixture for wear parts of the running gear of a high-speed train according to claim 8, characterized in that, The surface of the measuring fixture is treated for rust prevention and wear resistance.

10. The auxiliary measuring fixture for wear parts of the running gear of a high-speed train according to claim 1, characterized in that, The edges of the measuring fixture are rounded.

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