Wear-resistant part for a railway vehicle brake valve

Abstract

The present application belongs to the technical field of brake valve, and particularly relates to a wear-resistant action part for railway vehicle brake valve. The technical scheme is as follows: a wear-resistant action part for railway vehicle brake valve, comprising a main piston rod, a throttle valve and a slide valve connected to the main piston rod, the throttle valve and the slide valve being in sliding contact on one side, further comprising a slide valve sleeve, the main piston rod and the slide valve being arranged in the slide valve sleeve, and the side of the slide valve away from the throttle valve being in sliding contact with the slide valve sleeve; the slide valve comprises a plurality of layers of split structures fixedly connected, adjacent split structures being split from the position where the slide valve is provided with a transverse hole, and the transverse hole being closed in the transverse direction of the slide valve. The present application provides a wear-resistant action part for railway vehicle brake valve capable of avoiding leakage.

Description

Technical Field

[0001] This invention belongs to the field of brake valve technology, and specifically relates to a wear-resistant working part for a brake valve of railway vehicles. Background Technology

[0002] Currently, most railway vehicle brake valves in my country use a metal spool valve structure. These valves employ a copper alloy actuating component (including the spool valve, spool valve sleeve, control valve, and main piston rod). Changes in compressed air pressure in the upper and lower chambers of the main piston cause the spool valve and control valve to move up and down to different positions, thus connecting different air passages. The spool valve's secondary sealing surface is a flat seal, manufactured through grinding. During operation, this surface wears quickly, leading to plough-like grooves or corrosion-like marks, easily causing seal failure. Furthermore, the existing spool valve manufacturing process leaves numerous process holes, which frequently leak during use, potentially jeopardizing train safety. The upper and lower shoulders of the main piston rod and the broached grooves of the spool valve sleeve are also prone to severe wear. Therefore, to ensure train safety, the current maintenance cycle for railway freight car brake valves in my country is only two years. This means that every two years, the brake valve needs to be disassembled and cleaned, the spool valve's secondary sealing surface re-ground and repaired, lubricated, and then reassembled and tested, resulting in high overall maintenance costs. Summary of the Invention

[0003] In order to solve the above-mentioned problems in the prior art, the purpose of the present invention is to provide a wear-resistant working part for a railway vehicle brake valve that prevents leakage.

[0004] The technical solution adopted in this invention is as follows:

[0005] A wear-resistant working part for a railway vehicle brake valve includes a main piston rod, a control valve and a slide valve connected to the main piston rod, the control valve and the slide valve slidingly contacting each other on one side, and a slide valve sleeve, the main piston rod and the slide valve being disposed inside the slide valve sleeve, the side of the slide valve away from the control valve slidingly contacting the slide valve sleeve; the slide valve includes several layers of split structures fixedly connected, adjacent split structures being separated from the position where the slide valve is provided with a transverse hole, the transverse hole being closed in the transverse direction of the slide valve.

[0006] The transverse holes of the slide valve of this invention are provided with a split surface, so that each transverse hole can be directly grooved on the surface of the split structure, making the transverse holes closed in the transverse direction of the slide valve. This avoids the need to drill holes from the circumference of the slide valve to process the transverse holes and then seal the process holes. This invention changes the slide valve to a split composite structure, with no process holes in the entire slide valve, eliminating process plugs and preventing slide valve leakage caused by process plugs, thus ensuring driving safety.

[0007] As a preferred embodiment of the present invention, the adjacent split structures of the slide valve can be connected by one or more of welding, hot pressing, and cold rolling, but are not limited to welding, hot pressing, and cold rolling. The fixing method of the adjacent split structures is the corresponding composite method, such as welding, hot pressing, and cold rolling.

[0008] As a preferred embodiment of the present invention, both the slide valve and the control valve are provided with a wear-resistant coating. The present invention improves the wear resistance of the slide valve's secondary sealing surfaces (between the slide valve and the control valve, and between the slide valve and the slide valve sleeve) by creating a wear-resistant coating on the relatively soft surfaces of the slide valve and control valve, which reduces the coefficient of friction and increases strength and hardness. This reduces wear and extends the service life of the slide valve's secondary sealing surfaces.

[0009] As a preferred embodiment of the present invention, mounting grooves are provided on both the upper and lower shoulders of the main piston rod, and bushings are installed in the mounting grooves. Adding wear-resistant bushings to the upper and lower shoulders of the main piston rod can prevent direct contact and frictional wear between the metal parts of the guide contact area between the upper and lower shoulders of the main piston rod and the inner wall of the valve sleeve, thereby extending the service life of the main piston rod and the guide parts of the valve sleeve.

[0010] As a preferred embodiment of the present invention, the bushing is made of a wear-resistant material.

[0011] In a preferred embodiment of the present invention, a first spring is connected to the main piston rod, and the other end of the first spring is connected to the control valve. Under the action of the first spring, the control valve can fit tightly against the slide valve, ensuring reliable sealing.

[0012] In a preferred embodiment of the present invention, a limiting groove is provided on the main piston rod, and the control valve is disposed within the limiting groove. The limiting groove limits the movement of the control valve.

[0013] In a preferred embodiment of the present invention, a stabilizing rod is sleeved at one end of the main piston rod, and a second spring connects the stabilizing rod and the main piston rod. A limiting platform is provided on the main piston rod, and the slide valve is positioned between the limiting platform and the end face of the stabilizing rod. Under the action of the second spring, the stabilizing rod can press the slide valve tightly.

[0014] In a preferred embodiment of the present invention, a valve spring is rotatably connected to the valve slide. The valve spring is located on the side of the main piston rod away from the control valve, and the valve spring is pressed against the inner wall of the valve sleeve. The valve spring can press against the valve sleeve, so that the other side of the valve sleeve can reliably fit against the valve slide, ensuring a reliable seal.

[0015] As a preferred embodiment of the present invention, a rubber diaphragm is installed on the main piston rod.

[0016] The beneficial effects of this invention are as follows:

[0017] 1. The transverse holes of the slide valve of the present invention are provided with a split surface, so that each transverse hole can be directly grooved on the surface of the split structure, thereby closing the transverse holes in the transverse direction of the slide valve. This avoids the need to drill holes from the circumference of the slide valve to process the transverse holes and then seal the process holes. The present invention changes the slide valve to a split composite structure, with no process holes in the entire slide valve, eliminating process plugs, preventing slide valve leakage caused by process plugs, and ensuring driving safety.

[0018] 2. This invention improves the wear resistance of the valve secondary sealing surface (between the valve and the control valve, and between the valve and the valve sleeve) by forming a wear-resistant coating on the relatively soft surface of the spool valve and the control valve, which can reduce the coefficient of friction and improve the strength and hardness, thereby reducing wear and extending the service life of the valve secondary sealing surface.

[0019] 3. The present invention adds wear-resistant bushings to the upper and lower shoulders of the main piston rod, which can avoid friction and wear caused by direct contact between the metal parts of the guide contact parts between the upper and lower shoulders of the main piston rod and the inner wall of the valve sleeve, and extend the service life of the guide parts of the main piston rod and the valve sleeve. Attached Figure Description

[0020] Figure 1 This is a cross-sectional view of the present invention;

[0021] Figure 2 This is a schematic diagram of the structure of the present invention when the slide valve sleeve is removed;

[0022] Figure 3 This is an exploded view of a slide valve;

[0023] Figure 4 This is a bottom view of the slide valve;

[0024] Figure 5 yes Figure 4 Sectional view at point AA;

[0025] Figure 6 This is a schematic diagram of the bushing structure;

[0026] Figure 7 This is a schematic diagram of the main piston rod.

[0027] Figure 8 This is an assembly diagram of the bushing and the main piston rod;

[0028] Figure 9 This is a schematic diagram of the structure of an existing slide valve in the first direction;

[0029] Figure 10 This is a schematic diagram of the structure of an existing slide valve in the second direction;

[0030] Figure 11 This is the front view of an existing slide valve;

[0031] Figure 12yes Figure 11 Sectional view at point BB;

[0032] Figure 13 yes Figure 11 Sectional view at point CC.

[0033] In the diagram: 1-Main piston rod; 2-Control valve; 3-Slide valve; 4-Slide valve sleeve; 5-Ring bushing; 6-Stabilizing rod; 7-Slide valve spring; 8-Rubber diaphragm; 11-Mounting groove; 12-First spring; 13-Limiting groove; 14-Limiting platform; 31-Split structure; 32-Transverse hole; 33-Process hole; 34-Process plug; 61-Second spring. Detailed Implementation

[0034] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. The components of the embodiments of the present invention described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0035] Therefore, the following detailed description of the embodiments of the invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the invention without inventive effort are within the scope of protection of the invention. It should be noted that, unless otherwise specified, the embodiments and features described in the embodiments of the invention can be combined with each other.

[0036] like Figures 9-13 As shown, when the slide valve 3 is an integral unit, due to space constraints, drilling must begin from the circumference of the slide valve 3 to machine the transverse hole 32. After machining the transverse hole 32, a process plug 34 is needed to seal the opening of the transverse hole 32, usually using soldering. During use, leakage is prone to occur at the process plug 34, and severe leakage can endanger driving safety.

[0037] like Figures 1-5 As shown, the wear-resistant working part of the railway vehicle brake valve in this embodiment includes a main piston rod 1, on which a control valve 2 and a slide valve 3 are connected. The control valve 2 and the slide valve 3 slide in contact on one side. The valve also includes a slide valve sleeve 4, within which the main piston rod 1 and the slide valve 3 are disposed. The side of the slide valve 3 away from the control valve 2 slides in contact with the slide valve sleeve 4. The slide valve 3 includes several fixedly connected split structures 31. Adjacent split structures 31 are separated from each other at the location where a transverse hole 32 is provided in the slide valve 3. The transverse hole 32 is closed laterally in the slide valve 3. The fixing method of the adjacent split structures 31 of the slide valve 3 is a corresponding composite method, such as welding, hot pressing, cold rolling, etc.

[0038] The slide valve 3 of the present invention has a split surface at the position of the transverse hole 32, so that each transverse hole 32 can be directly grooved on the surface of the split structure 31, so that the transverse hole 32 is closed in the transverse direction of the slide valve 3, avoiding the situation of drilling holes from the circumference of the slide valve 3 to process the transverse hole 32 and then sealing the process hole 33. The present invention changes the slide valve 3 into a split composite structure, the slide valve 3 as a whole has no process hole 33, and the process plug 34 is eliminated, preventing the slide valve 3 from leaking due to the process plug 34, and ensuring driving safety.

[0039] Furthermore, both the slide valve 3 and the control valve 2 are provided with a wear-resistant coating. This invention improves the wear resistance of the sealing surfaces of the slide valve 3 (between the slide valve 3 and the control valve 2, and between the slide valve 3 and the slide valve sleeve 4) by creating a wear-resistant coating on the relatively soft surfaces of the slide valve 3 and the control valve 2, which reduces the coefficient of friction and increases strength and hardness. This reduces wear and extends the service life of the sliding valve's secondary sealing surfaces.

[0040] Furthermore, such as Figures 6-8 As shown, mounting grooves 11 are provided on both the upper and lower shoulders of the main piston rod 1, and bushings 5 ​​are installed in the mounting grooves 11. The bushings 5 ​​are made of wear-resistant material. Adding wear-resistant bushings 5 ​​to the upper and lower shoulders of the main piston rod 1 can avoid friction and wear caused by direct contact between the metal parts of the guide contact parts between the upper and lower shoulders of the main piston rod 1 and the inner wall of the valve sleeve 4, thereby extending the service life of the guide parts of the main piston rod 1 and the valve sleeve 4.

[0041] In this invention, a first spring 12 is connected to the main piston rod 1, and the other end of the first spring 12 is connected to the control valve 2. Under the action of the first spring 12, the control valve 2 can fit tightly against the slide valve 3, ensuring reliable sealing. A limiting groove 13 is provided on the main piston rod 1, and the control valve 2 is disposed in the limiting groove 13. The limiting groove 13 limits the control valve 2.

[0042] A stabilizing rod 6 is fitted onto one end of the main piston rod 1. A second spring 61 connects the stabilizing rod 6 and the main piston rod 1. A limiting platform 14 is provided on the main piston rod 1, and the slide valve 3 is positioned between the limiting platform 14 and the end face of the stabilizing rod 6. Under the action of the second spring 61, the stabilizing rod 6 can press the slide valve 3 tightly.

[0043] A valve spring 7 is rotatably connected to the valve 3. The valve spring 7 is located on the side of the main piston rod 1 away from the control valve 2, and it is pressed against the inner wall of the valve sleeve 4. The valve spring 7 can press against the valve sleeve 4, so that the other side of the valve sleeve 4 can be reliably fitted with the valve 3, ensuring a reliable seal.

[0044] A rubber diaphragm plate 8 is installed on the main piston rod 1.

[0045] This invention is not limited to the above-described optional embodiments. Anyone can derive other various forms of products under the guidance of this invention. However, regardless of any changes made in their shape or structure, any technical solution that falls within the scope of the claims of this invention shall be protected by this invention.

Claims

1. A wear-resistant working part for a railway vehicle brake valve, comprising a main piston rod (1), a control valve (2) and a slide valve (3) connected to the main piston rod (1), the control valve (2) and the slide valve (3) slidingly contacting one side, and further comprising a slide valve sleeve (4), the main piston rod (1) and the slide valve (3) being disposed within the slide valve sleeve (4), the side of the slide valve (3) away from the control valve (2) slidingly contacting the slide valve sleeve (4); characterized in that: The slide valve (3) comprises several fixedly connected layers of split structures (31), adjacent split structures (31) are split from the position where the slide valve (3) is provided with a transverse hole (32), and the transverse hole (32) is closed in the transverse direction of the slide valve (3).

2. A wear pack for a railway car brake valve according to claim 1, wherein: The adjacent split structures (31) are connected by one or more of welding, hot pressing and cold rolling.

3. A wear pack for a railway car brake valve according to claim 1, wherein: The slide valve (3) and the throttle valve (2) are both provided with wear-resistant coatings.

4. A wear pack for a railway car brake valve according to claim 1, wherein: The upper and lower shoulder portions of the main piston rod (1) are both provided with mounting grooves (11), and a gasket (5) is mounted in the mounting grooves (11).

5. A wear pack for a railway car brake valve according to claim 4, wherein: The gasket (5) is made of wear-resistant material.

6. A wear pack for a railway car brake valve according to claim 1, wherein: The main piston rod (1) is connected with a first spring (12), and the other end of the first spring (12) is connected with the throttle valve (2).

7. A wear pack for a railway car brake valve according to claim 6, wherein: The main piston rod (1) is provided with a limiting groove (13), and the throttle valve (2) is arranged in the limiting groove (13).

8. A wear pack for a railway car brake valve according to claim 1, wherein: One end of the main piston rod (1) is sleeved with a stabilizing rod (6), a second spring (61) is connected between the stabilizing rod (6) and the main piston rod (1), the main piston rod (1) is provided with a limiting platform (14), and the slide valve (3) is arranged between the limiting platform (14) and the end face of the stabilizing rod (6).

9. A wear pack for a railway car brake valve according to claim 1, wherein: The slide valve (3) is rotatably connected with a slide valve spring (7), the slide valve spring (7) is located on the side of the main piston rod (1) away from the throttle valve (2), and the slide valve spring (7) is pressed against the inner wall of the slide valve sleeve (4).

10. A wear pack for a railway car brake valve according to any one of claims 1-9, characterized in that: The main piston rod (1) is mounted with a rubber diaphragm (8).

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