A carbon slide wear testing device

Abstract

The present invention discloses a carbon slide wear test device, which relates to the field of carbon slides and includes a relatively arranged clamping device and a rotating wheel. The rotating wheel is rotated by a driving module. The rotating wheel includes a contact wire, which is fixed in a spiral shape along the outer diameter of the rotating wheel. A sample block is fixed on the clamping device and abuts against the contact wire. The technical effects of the present invention are: (1) the contact wire on the rotor is designed as a spiral structure according to the zigzag wiring of rail transit. Its rotation speed and pitch correspond to the operating speed of the rail transit vehicle and the pull-out value of the contact wire, which well simulates the actual working conditions of contact wear; (2) the activeness of the contact wire movement is effectively simulated, the sample block has no mechanical movement, the entire operation is stable, the offline rate of the sample piece and the occurrence of electric sparks and arcs are reduced, the process is highly accurate, and the process is controllable and repeatable; (3) the overall equipment is small, the contact wire can be flexibly replaced, and the effective utilization rate is higher.

Description

Technical Field

[0001] The invention relates to the field of carbon slide plates, and in particular to a carbon slide plate wear testing device. Background Art

[0002] Carbon skateboard wear testing equipment is a key equipment before the development and use of carbon skateboard materials. It is an important part of the development and evaluation capabilities of carbon skateboard manufacturers. There are two types of contact line designs for existing carbon skateboard wear test equipment. One is directly fixed on the rotor. It is designed to be annular and rotates with the rotor. When rotating, it rubs against the sample block installed on the side to test the wear resistance of the material. The sample block has two modes: static and lateral movement. However, this wiring method has the following disadvantages: 1) When the sample block is stationary, this type of wear is only linear wear between the contact line and the sample block, and it cannot simulate the zigzag surface wear between the contact line and the slide under actual working conditions; 2) If the sample block moves back and forth laterally with a certain amplitude to simulate the zigzag motion, although this type of wear simulates the reciprocating surface wear in actual applications, the sample block has to move back and forth laterally under the application of pressure, and the sample block is constantly accelerating and decelerating, which will cause the degree of wear of the contact line on the sample block to be different, the sample block vibrates greatly, the offline rate is high, and the electric spark and arcing phenomena are serious. In addition, it has extremely high requirements for mechanical design and precision, and it is difficult to maintain a stable output of the loaded contact force. The process fluctuates greatly, and the accuracy and repeatability during testing are poor.

[0003] Another method uses two pulley-like rotors with a contact wire mounted on them. When the motor is turned on, the pulleys rotate the contact wire, which then rubs against a specimen mounted on the side to test the material's wear resistance. However, in addition to the aforementioned drawbacks, this method also suffers from a bulky overall structure, high investment, and difficulty ensuring accurate movement. Summary of the Invention

[0004] In view of the above-mentioned defects of the prior art, the technical problem to be solved by the present invention is to provide a carbon slide wear testing equipment with a small footprint, and accurately simulate the zigzag movement of the pantograph carbon slide in actual working conditions, so as to improve the reference value of the wear test.

[0005] To achieve the above-mentioned purpose, the present invention provides a carbon skateboard wear testing device, including a clamping device and a rotating wheel arranged relatively to each other, wherein the rotating wheel is rotated by a driving module, and the rotating wheel includes a contact line, which is fixed in a spiral shape around the outer diameter of the rotating wheel, and the sample block is fixed on the clamping device and abuts against the contact line.

[0006] Furthermore, the contact line is mortise-jointed with the runner, the contact line is provided with a dovetail tenon, and the outer periphery of the runner is provided with a mortise and tenon groove.

[0007] Furthermore, the contact wire is a copper-silver alloy.

[0008] Furthermore, the wheel diameter D of the rotating wheel is adjusted according to the following formula to adjust the pitch S (unit: mm) of the contact line:

[0009] S = (4 × a × πD) ÷ (L × 1000);

[0010] Among them, a represents the pull-out value, and L represents the operating span of the electric locomotive.

[0011] Furthermore, the pull-out value a ranges from 200 mm to 300 mm.

[0012] Furthermore, the operating span L of the electric locomotive is 245 meters.

[0013] Furthermore, the wheel diameter D ranges from 440 mm to 520 mm.

[0014] Furthermore, the wheel surface of the rotating wheel also includes a balancing block groove and a balancing block; the balancing block groove is arranged along the circumference of the rotating wheel, and the balancing block groove includes a balancing block entrance. The balancing block is inserted into the balancing block groove through the balancing block entrance and is slid and fixed along the balancing block groove.

[0015] The technical effects of the present invention are: (1) the contact wire on the rotor is designed as a spiral structure according to the zigzag wiring of rail transportation, and its rotation speed and pitch correspond to the operating speed of the rail transportation vehicle and the pull-out value of the contact wire, which well simulates the actual working conditions of contact wear;

[0016] (2) Effectively simulate the activeness of contact line movement. The specimen block has no mechanical movement and the entire operation is stable. Compared with the online operation of carbon slide materials, the simulation degree is extremely high in terms of electric sparks, arcs and offline rates. During the wear test, the contact line and the specimen block form a reciprocating wear surface (simulated pull-out value), with high accuracy, controllable process and good repeatability.

[0017] (3) The overall equipment is small, the contact line can be flexibly replaced, and the effective utilization rate is higher. The concept, specific structure and technical effects of the present invention will be further explained below in conjunction with the accompanying drawings to fully understand the purpose, characteristics and effects of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Other features, objects and advantages of the present invention will become more apparent upon reading the detailed description of non-limiting embodiments made with reference to the following drawings:

[0019] Figure 1 This is a structural front view of an embodiment of the present invention;

[0020] Figure 2 A top view of the structure of an embodiment of the present invention;

[0021] Figure 3 AA cross-sectional view of an embodiment of the present invention;

[0022] Figure 4 This is an enlarged view of the contact line of section A according to an embodiment of the present invention;

[0023] Figure 5 This is an enlarged view of the rotating wheel of part A according to an embodiment of the present invention.

[0024] Explanation of the reference numerals: 1-contact line; 2-rotating wheel; 3-dovetail tenon; 4-mortise and tenon groove; 5-balancing weight slot; 6-balancing weight inlet; 7-balancing weight. DETAILED DESCRIPTION

[0025] The following describes several preferred embodiments of the present invention with reference to the accompanying drawings to make its technical content clearer and easier to understand. The present invention can be embodied in many different forms of embodiments, and the scope of protection of the present invention is not limited to the embodiments mentioned herein.

[0026] In the drawings, components with identical structures are denoted by the same reference numerals, and components with similar structures or functions are denoted by similar reference numerals. The size and thickness of each component shown in the drawings are arbitrary and are not limited by the present invention. For clarity, the thickness of components in some places in the drawings is appropriately exaggerated.

[0027] like Figures 1 to 3 As shown, the present invention is a carbon skateboard wear testing device, including a clamping device (not shown in the figure) and a runner 2 arranged relatively to each other. The runner 2 is rotated by a driving module. The runner 2 includes a contact wire 1, which is fixed in a spiral shape around the outer diameter of the runner 2. The sample block is fixed on the clamping device and abuts against the contact wire 1.

[0028] The clamping device is used to clamp the specimen, securing it in fixed contact with contact wire 1. When the drive module influences the rotating wheel 2, it begins to rotate, driving the spiral contact wire 1 along with it, leaving a zigzag path on the specimen, fully simulating actual operating conditions. Furthermore, since the specimen applies pressure only in the direction of contact wire 1, the lateral path is completed by the contact wire 1 on the rotating wheel 2. This effectively reduces specimen vibration and spark generation, ensuring a stable and precise testing process.

[0029] Furthermore, if Figures 4 and 5 As shown, a dovetail joint 3 is provided on one side of the contact wire 1, and a mortise and tenon groove 4 is provided on the outer periphery of the runner 2. The dovetail joint 3 of the contact wire 1 is inserted into the mortise and tenon groove 4 and fixed to the runner 2. This allows for convenient and flexible removal and replacement of the contact wire 1 when it wears out from extensive use. Furthermore, the easily removable contact wire 1 facilitates wear assessment and surface morphology analysis.

[0030] Furthermore, the contact wire 1 is made of copper-silver alloy. The contact wire can be selected according to the actual use environment of the carbon slide plate, but is not limited to copper-silver alloy. All contact wires used in existing locomotives and subways, in accordance with the implementation standard TB / T2809-2017, can be included in this design. In order to better simulate the working conditions, the material selection of the contact wire 1 refers to the standard TB / T2809-2017. For example, if the maximum cross-sectional area of the contact wire 1 is 120mm 2 Taking (CTAH120) as an example, the maximum wire width is 12.64 to 13.16 mm.

[0031] Furthermore, the pitch S of the spiral contact line 1 is adjusted with reference to the wheel diameter D of the rotating wheel according to the following formula:

[0032] S = (4 × a × πD) ÷ (L × 1000);

[0033] Among them, a represents the pull-out value, and L represents the operating span of the electric locomotive.

[0034] Generally, the range of the pull-out value a is determined by the specifications of the carbon slide pantograph of the electric locomotive, and is preferably 200 mm, 250 mm, and 300 mm.

[0035] Generally, the operating span L of an electric locomotive is determined by the standard width of a span L. The span can be selected according to the actual use environment of the carbon slide, such as electric locomotive, subway, etc. In this embodiment, taking the subway as an example, the span L is selected to be 245 meters.

[0036] Generally, there is no restriction on the wheel diameter D of the runner 2. However, the runner speed must not exceed 3000 RPM. The runner speed must simulate the operating speed of a conventional electric locomotive or subway train between 80 km / h and 500 km / h. This allows for simulating actual operating speeds while reducing the risk of accidents during the experiment. Specifically, the wheel diameter D should generally not exceed 885 mm, and is preferably between 440 mm and 520 mm.

[0037] The following table shows the range of contact wire pitch, assuming a pullout of 300 mm, a maximum subway speed of 160 km / h, and a standard span width of 245 meters. The contact wire pitch S ranges from 6.78 mm to 8 mm, depending on the runner diameter D. The operating speed of the electric locomotive can be converted based on the runner speed to accurately simulate carbon slide pantograph wear at different speeds.

[0038]

[0039]

[0040] Furthermore, the wheel surface of the wheel 2 also includes a balancing weight groove 5 and a balancing weight 7. The balancing weight groove 5 is arranged along the circumference of the wheel 2. The balancing weight groove 5 includes a balancing weight inlet 6. The balancing weight 7 is inserted into the balancing weight groove 5 through the balancing weight inlet 6 and is slid and fixed along the balancing weight groove 5.

[0041] After the contact wire is secured to the rotor via the dovetail joint and the mortise and tenon, dynamic balancing must be performed before installation due to the asymmetric center of mass of the spiral design. This is done in accordance with the G2.5 standard in the "JIS B0905-1992 Dynamic Balance Grades" (derived from the International Organization for Standardization's recommended standard ISO1940, "Balance Quality of Rotor Rigid Bodies"). A dedicated centrifugal balancing machine should be used to measure the location of the rotor's unbalanced weight while it is rotating, determine the location and size of the balancing weight, and install balancing weights 7 in the corresponding balancing weight slots 5 to eliminate the dynamic imbalance couple and the centrifugal force of the static imbalance.

[0042] The preferred embodiments of the present invention have been described in detail above. It should be understood that numerous modifications and variations based on the concepts of the present invention can be made by one of ordinary skill in the art without inventive effort. Therefore, any technical solution that can be derived by one of ordinary skill in the art through logical analysis, reasoning, or limited experimentation based on the concepts of the present invention and the prior art should be within the scope of protection defined by the claims.

Claims

1. A carbon slide wear testing device, characterized in that: The device comprises a clamping device and a rotating wheel which are arranged opposite to each other, wherein the rotating wheel is rotated by a driving module, and the rotating wheel comprises a contact line which is fixed in a spiral shape around the outer diameter of the rotating wheel, and the sample block is fixed on the clamping device and abuts against the contact line; The wheel diameter D of the rotating wheel is adjusted according to the following formula to adjust the pitch S of the contact line: S = (4 × a × πD) ÷ (L × 1000); Wherein, a represents the pull-out value, and L represents the operating span of the electric locomotive; The pull-out value a ranges from 200 mm to 300 mm; The operating span L of the electric locomotive is 245 meters.

2. The carbon slide wear testing device according to claim 1, characterized in that: The contact line is mortise-and-tenoned with the runner, the contact line is provided with a dovetail tenon, and the outer periphery of the runner is provided with a mortise and tenon groove.

3. The carbon slide wear testing device according to claim 1, characterized in that: The contact wire is a copper-silver alloy.

4. The carbon slide wear testing device according to any one of claims 1 to 3, characterized in that: The wheel diameter D ranges from 440 mm to 520 mm.

5. The carbon slide wear testing device according to any one of claims 1 to 3, characterized in that: The wheel surface of the rotating wheel also includes a balancing block groove and a balancing block; the balancing block groove is arranged along the circumference of the rotating wheel, and the balancing block groove includes a balancing block entrance. The balancing block is inserted into the balancing block groove through the balancing block entrance and is slid and fixed along the balancing block groove.

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