Railway brake cylinder piston thickness detection device and method

Abstract

The application provides a railway brake cylinder piston processing residual wall thickness detection device and method, and relates to the technical field of thickness detection. The device comprises a detection plate, one side of the detection plate is provided with a detection groove, the side groove wall, groove bottom and the other side groove wall of the detection groove are sequentially connected to form a U shape, the length of the side groove wall of the detection groove is not greater than the first vertical distance between the other end face of the piston and the foot, and the width of the groove bottom of the detection groove is not greater than the second vertical distance between the outer periphery of the first rib plate and the foot. When the detection method utilizes the detection device, the detection plate is pushed towards the direction of the groove bottom of the piston groove until the detection plate cannot move. If the groove bottom of the detection groove and the other side groove wall of the detection groove are respectively attached to the other end face of the piston and the outer periphery of the first rib plate at this time, it is determined that the residual thickness is unqualified, otherwise, it is determined that the residual thickness is qualified.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of thickness detection, and more particularly relates to a railway brake cylinder piston thickness detection device and method. BACKGROUND

[0002] In recent years, during the operation of vehicles, the problem of brake cylinder piston air leakage caused by the cracking and damage of the sealing ring at the upper part of the piston due to the lack of lubricating oil has frequently occurred. In order to solve this problem, the industry has invented and used a positive lubrication brake cylinder. The positive lubrication function of the positive lubrication brake cylinder mainly utilizes the principle of ratchet pawl to rotate the brake cylinder piston during the relief process, thereby bringing the oil at the piston to the upper part, and simultaneously carrying out positive lubrication modification on the existing rotary pressure sealing brake cylinder.

[0003] As shown in Figure 1 The main content of the positive lubrication modification of the existing rotary pressure sealing brake cylinder is that a gear ring 2 is welded to the inner end face of the cylinder body 1, a pawl spring sheet 4 is installed on one end face of the piston 3, a thrust bearing 5 is added at the front cover spring seat, a waterproof ring seat and a waterproof sealing ring 7 are added between the front cover and the piston rod 6, and a rain umbrella 17 is welded at the dust cover. When modifying the one end face of the piston to install the pawl spring sheet, the bolt hole machining position for installing the pawl spring sheet is exactly at the excessive draft angle of the brake cylinder cast piston end wall to the vertical wall or at the vertical wall, so the piston manufacturing error affects the machining of the bolt hole of the piston for the positive lubrication modification of the brake cylinder, and problems such as hole penetration or too thin residual wall thickness after hole penetration are prone to occur, therefore it is necessary to measure the distance between the hole bottom edge of the bolt hole and the inner wall of the piston to ensure whether the thickness of the modified piston is qualified, but the inner wall corresponding to the spring sheet installation surface of the existing piston is of a circular arc type, so it is impossible to directly measure the residual thickness between the hole bottom edge of the bolt hole after machining and the inner wall of the piston, and it is also impossible to ensure whether the thickness of the modified piston is qualified. SUMMARY

[0004] The purpose of the present application is to provide a railway brake cylinder piston thickness detection device and method to solve the problem that the inner wall corresponding to the spring sheet installation surface of the existing piston is of a circular arc type, it is impossible to directly measure the residual thickness between the hole bottom edge of the bolt hole after machining and the inner wall of the piston, and it is also impossible to ensure whether the thickness of the modified piston is qualified.

[0005] In order to achieve the above object, the present application provides a railway brake cylinder piston processing residual wall thickness detection device, one end face of the piston is provided with a plurality of bolt holes for installing pawl spring sheets, the other end face of the piston is provided with a piston groove, the groove wall of the piston groove is provided with a draft angle, the draft angle and the groove bottom of the piston groove are connected through a circular arc surface, the outer periphery of the piston is provided with a ring-shaped first rib plate, the distance between the bottom hole edge of the bolt hole and the foot of the circular arc surface is the minimum residual wall thickness of the piston, characterized in that the device comprises:

[0006] A detection plate is arranged on one side of the detection plate, and a detection groove is arranged on one side of the detection plate, wherein the side groove wall, the groove bottom and the other side groove wall of the detection groove are sequentially connected to form a U shape, the length of the side groove wall of the detection groove is not greater than the first vertical distance between the other end face of the piston and the foot, and the width of the groove bottom of the detection groove is not greater than the second vertical distance between the outer periphery of the first rib plate and the foot.

[0007] Preferably, a second rib plate is arranged at a position close to the first rib plate on the outer periphery of the piston, and a lubricating sleeve mounting groove is formed between the first rib plate and the second rib plate on the outer periphery of the piston.

[0008] Preferably, a third rib plate is arranged at a position close to the second rib plate on the outer periphery of the piston, and a sealing ring mounting groove is formed between the second rib plate and the third rib plate on the outer periphery of the piston.

[0009] Preferably, an annular mounting surface is arranged on one end face of the piston, and a plurality of bolt holes for installing pawl spring sheets are arranged on the annular mounting surface.

[0010] Preferably, a mounting boss is extended from the middle of the other end face of the piston, and a mounting groove is arranged at the end of the mounting boss.

[0011] Preferably, the distance between the hole bottom of the bolt hole and the one end face of the piston is a constant value.

[0012] Preferably, the distance between the center of the bolt hole and the sealing ring mounting groove is a constant value.

[0013] Preferably, the distance between the outer periphery surface of the first rib plate and the outer periphery surface of the second rib plate is a constant value, and the distance between the outer periphery surface of the first rib plate and the outer periphery surface of the third rib plate is a constant value.

[0014] Preferably, the distance between the one end face of the piston and the other end face of the piston is a constant value.

[0015] A railway brake cylinder piston processing residual wall thickness detection method, using the railway brake cylinder piston processing residual wall thickness detection device, the method comprises:

[0016] The detection plate is placed in the detection position of the piston, so that the groove wall of the piston groove is embedded into the detection groove;

[0017] The detection plate is pushed towards the direction of the groove bottom of the piston groove until the detection plate cannot be moved;

[0018] If the groove bottom of the detection groove and the other side groove wall of the detection groove are respectively fitted with the other end face of the piston and the outer circumferential surface of the first rib plate at this time, it is determined that the residual thickness is unqualified, otherwise it is determined that the residual thickness is qualified.

[0019] The present application provides a kind of railway brake cylinder piston thickness detection device and method, its beneficial effect lies in: one side of the detection plate of the device is provided with the side groove wall of detection groove, groove bottom, other side groove wall is sequentially connected to form U shape, the height of the side groove wall of detection groove is not more than the first vertical distance between the other end face of piston and foot, the width of the groove bottom of detection groove is not more than the second vertical distance between the outer circumferential surface of first rib plate and foot, when using the detection method using the detection device, detection plate is pushed towards the direction of the groove bottom of piston groove until the detection plate cannot be moved, if the groove bottom of detection groove and the other side groove wall of detection groove are respectively fitted with the other end face of piston and the outer circumferential surface of first rib plate at this time, it is determined that the residual thickness is unqualified, otherwise it is determined that the residual thickness is qualified.

[0020] Other features and advantages of the present application will be described in detail in the subsequent specific embodiments. BRIEF DESCRIPTION OF DRAWINGS

[0021] The above and other objects, features and advantages of the present application will become more apparent from the following detailed description when taken in conjunction with the accompanying drawings in which like reference characters refer to like parts throughout the several views, in which exemplary embodiments of the present application are shown.

[0022] Figure 1 The structure schematic diagram of the existing brake cylinder after modification is shown;

[0023] Figure 2 The piston structure schematic diagram of the existing brake cylinder after modification is shown;

[0024] Figure 3 The structure schematic diagram of one end face of the piston of the existing brake cylinder after modification is shown;

[0025] Figure 4 The structure schematic diagram of the minimum residual wall thickness size of bolt hole after processing of the piston of the existing brake cylinder after modification is shown;

[0026] Figure 5Fig. 1 shows a structure diagram of a bolt hole of a piston of a brake cylinder after modification, and a theoretical minimum residual wall thickness after machining is 3mm;

[0027] Figure 6 Fig. 2 shows a structure diagram of a residual wall thickness detection device for a piston of a railway brake cylinder according to an embodiment of the present application;

[0028] Figure 7 Fig. 3 shows a flow chart of a residual wall thickness detection method for a piston of a railway brake cylinder according to an embodiment of the present application.

[0029] Comparative explanation of the drawings:

[0030] 1, cylinder body; 2, gear ring; 3, piston; 4, pawl spring plate; 5, thrust bearing; 6, piston rod; 7, waterproof sealing ring; 8, bolt hole; 9, piston groove; 10, circular arc surface; 11, first rib plate; 12, detection plate; 13, detection groove; 14, second rib plate; 15, third rib plate; 16, mounting surface; 17, rain umbrella. DETAILED DESCRIPTION

[0031] The preferred embodiments of the present application will be described in more detail below. Although the preferred embodiments of the present application are described below, it should be understood that the present application can be implemented in various forms and should not be limited by the embodiments set forth herein. On the contrary, these embodiments are provided so that the present application is more complete and complete, and the scope of the present application is fully conveyed to those skilled in the art.

[0032] As shown in Figure 1 , Figure 2 , Figure 3 and 6 , the present application provides a residual wall thickness detection device for a piston of a railway brake cylinder, one end face of the piston 3 is provided with a plurality of bolt holes 8 for mounting the pawl spring plate 4, the other end face of the piston 3 is provided with a piston groove 9, the groove wall of the piston groove 9 is provided with a draft angle, the draft angle is connected with the groove bottom of the piston groove through a circular arc surface 10, the outer periphery of the piston 3 is provided with an annular first rib plate 11, the distance between the bottom hole edge of the bolt hole 8 and the foot of the circular arc surface 10 is the minimum residual wall thickness of the piston, characterized in that the device comprises:

[0033] A detection plate 12 is provided with a detection groove 13 on one side, the one side groove wall, groove bottom and the other side groove wall of the detection groove 13 are sequentially connected to form a U shape, the length of the one side groove wall of the detection groove 13 is not greater than the first vertical distance between the other end face of the piston 3 and the foot, and the width of the groove bottom of the detection groove 13 is not greater than the second vertical distance between the outer periphery of the first rib plate 11 and the foot.

[0034] Specifically, in order to solve the problem that the inner wall corresponding to the installation surface machining part of the existing pawl spring sheet 4 of the piston 3 is arc-shaped, the remaining thickness between the hole bottom edge of the bolt hole after machining and the inner wall of the piston cannot be directly measured, and whether the thickness of the modified piston is qualified cannot be ensured, the present application provides a railway brake cylinder piston thickness detection device, one side of the detection plate 12 is provided with a U-shaped detection groove 13, the height of one side groove wall of the detection groove 13 is not greater than the first vertical distance between the other end face of the piston 3 and the foot, the width of the groove bottom of the detection groove 13 is not greater than the second vertical distance between the outer periphery of the first edge plate 11 and the foot, when using the detection device, the detection plate 12 is pushed towards the direction of the groove bottom of the piston groove 9 until the detection plate 12 cannot move, if the groove bottom of the detection groove 13 and the other side groove wall of the detection groove 13 are respectively attached to the other end face of the piston and the outer periphery of the first edge plate 11 at this time, it is determined that the remaining thickness is unqualified, otherwise it is determined that the remaining thickness is qualified.

[0035] Preferably, the angle between the groove bottom of the detection groove 13 and the other side groove wall of the detection groove 13 is convex inward.

[0036] Specifically, when the detection plate 12 detects, the angle can be embedded between the first edge plate 11 and the other end face of the piston 3.

[0037] Preferably, the position of the outer periphery of the piston 3 close to the first edge plate 11 is provided with a second edge plate 14, and the outer periphery of the piston 3 is located between the first edge plate 11 and the second edge plate 14 to form a lubricating sleeve mounting groove.

[0038] Specifically, the lubricating sleeve mounting groove is used to sleeve the lubricating sleeve.

[0039] Preferably, the position of the outer periphery of the piston 9 close to the second edge plate 14 is provided with a third edge plate 15, and the outer periphery of the piston 9 is located between the second edge plate 14 and the third edge plate 15 to form a sealing ring mounting groove.

[0040] Specifically, the sealing ring mounting groove is used to sleeve the sealing ring.

[0041] Preferably, one end face of the piston 3 is provided with an annular mounting surface 16, and the annular mounting surface 16 is used to set a plurality of bolt holes 8 for mounting the pawl spring sheet 4.

[0042] Specifically, the number of bolt holes 8 is preferably six, and the mounting surface 16 is convenient for machining the bolt hole 8.

[0043] Preferably, the other end face of the piston 3 extends a mounting boss in the middle, and the end of the mounting boss is provided with a mounting groove.

[0044] Specifically, the mounting boss is used to install the spring, and the mounting groove is used to install the piston rod 6.

[0045] Preferably, the distance from the hole bottom of the bolt hole 8 to one end surface of the piston 3 is constant.

[0046] The distance from the center of the bolt hole 8 to the sealing ring mounting groove is constant.

[0047] The distance between the outer circumferential surface of the first rib plate 11 and the outer circumferential surface of the second rib plate 14 is constant, and the distance between the outer circumferential surface of the first rib plate 11 and the outer circumferential surface of the third rib plate 15 is constant.

[0048] The distance between one end surface of the piston 3 and the other end surface of the piston 3 is constant.

[0049] As shown in Figure 7 A method for detecting the remaining wall thickness of a railway brake cylinder piston, using a railway brake cylinder piston processing remaining wall thickness detection device, the method comprises:

[0050] Place the detection plate 12 at the detection position of the piston 3, so that the groove wall of the piston groove 9 is embedded in the detection groove 13;

[0051] Push the detection plate 12 towards the direction of the groove bottom of the piston groove 9 until the detection plate 12 cannot move;

[0052] If the groove bottom of the detection groove 13 and the other side groove wall of the detection groove 13 respectively fit with the other end surface of the piston 3 and the outer circumferential surface of the first rib plate 11 at this time, it is determined that the remaining thickness is unqualified, otherwise it is determined that the remaining thickness is qualified.

[0053] Specifically, take the 305×254A type brake cylinder as an example:

[0054] (I) Design remaining thickness calculation of piston processing

[0055] 1. Theoretical remaining thickness calculation after bolt hole processing

[0056] As shown in Figure 4 Take the 305×254A type brake cylinder piston as an example, combined with the analysis of piston casting and processing technology, the main dimensions affecting the processing remaining wall thickness of the bolt hole 8 of the piston 3 are the thickness of the piston 3 16mm, the inner side bend angle R of the arc surface 10 of the piston 3 15mm, the diameter The processing depth of the mounting surface 16 of the piston 3 is 12mm, and the processing depth of the bottom hole of the bolt hole 8 is 11mm.

[0057] The above size tolerances are not specified in the manufacturing and modification drawings, so refer to CT11 level in GB / T 6414-2017 “Casting Dimensional Tolerance, Geometric Tolerance and Machining Allowance” and m level tolerance in GB / T 1804-2000 “Tolerance of Linear and Angular Dimensions with No Noted Tolerance”, to determine the thickness of the piston 3 as 16±1.5mm, the inner side bend angle R15±1.5mm of the piston 3, the diameter of the inner side bend angle (i.e. radius 123.5±1.4mm), the machining depth of the mounting surface 16 of the piston 3 as 12±0.2mm, and the machining depth of the bolt hole 8 as 11±0.2mm.

[0058] According to the CAD simulation measurement of the drawings, the thinnest remaining wall thickness after machining of the bolt hole 8 is the perpendicular distance between the bottom hole edge of the bolt hole 8 and the circular surface 10, and the nominal remaining wall thickness designed by the drawings is 4.8mm; using the tolerance accumulation method of the above-mentioned size, the theoretical minimum remaining wall thickness of one end surface of the piston 3 after machining of the bolt hole 8 is 2.04mm according to CAD simulation calculation.

[0059] (II) Remaining thickness control and detection method

[0060] 1. Piston structure and bolt hole machining process analysis

[0061] As shown in Figure 2 and Figure 3 , taking the 305×254A type brake cylinder piston as an example (the machining method and content of each piston are consistent), the mounting surface 16 for installing the pawl spring piece 4 on one end surface of the piston 3 is machined with a depth H (12mm) taken as the reference of one end surface of the piston 3, and the bottom hole depth h2 (11mm) of the bolt hole 8 is machined with the mounting surface 16 as the reference, i.e. the cumulative size (23mm) of the bottom hole depth h2 of the bolt hole 8 of each piston 3 from one end surface of the piston 3 is a fixed value.

[0062] At present, the other end surface of the piston 3 is machined by a lathe, the mounting surface 16 is fixed by using a special tool during machining, and is positioned by the sealing ring installation groove; the center of the bolt hole 8 is positioned by the inner side step surface of the mounting surface 16 during machining, i.e. the distance between the center of the bolt hole 8 of each piston 3 and the sealing ring installation groove of the piston 3 is a fixed value.

[0063] During manufacturing of the piston 3, the sealing ring installation groove, the lubricating sleeve installation groove, and the other end surface of the piston 3 are all machined parts and have consistent machining references, i.e. the distance between the edge surface of the sealing ring installation groove and the edge surface of the lubricating sleeve installation groove of each piston 3 is a fixed value, and the total thickness between one end surface of the piston 3 and the other end surface of the piston is a fixed value.

[0064] 2. Remaining thickness control scheme ​

[0065] As Figure 5 shown, for the purpose of ensuring the safety of 305x254A brake cylinder, it is suggested that the minimum remaining wall thickness of control piston 3 be ≥3mm.

[0066] Taking the 305x254A brake cylinder piston as an example, when the minimum remaining wall thickness of piston 3 after machining is 3mm (i.e. the vertical distance between the bottom hole edge of bolt hole 8 and arc surface 10 is 3mm), the minimum remaining wall thickness is 25.18mm away from one end surface of piston 3 (i.e. 45.32mm away from the other end surface of piston 3), 123.34mm away from the center of piston 3 (i.e. 28.16mm away from the outer periphery of first flange plate 11).

[0067] Based on the principle that the remaining thickness detection reference after machining of bolt hole 8 is basically consistent with the machining reference during modification of piston 3, in order to reduce measurement error, when determining the minimum remaining wall thickness of piston 3 after machining of bolt hole 8 ≥3mm, the depth direction is measured with the other end surface of piston 3 as the reference, and the transverse direction is measured with the outer periphery of first flange plate 11 as the reference, and the distance between the minimum remaining wall thickness and the other end surface of piston 3 in the depth direction is ≤45.32mm, and the distance between the minimum remaining wall thickness and the outer periphery of first flange plate 11 in the radial direction is ≤28.16mm.

[0068] 3. Formulate a remaining wall thickness detection device and detection method

[0069] As Figure 6 and Figure 7 shown, according to the above control requirements, combined with the structural characteristics of piston 3, when the detection device is made, the other end surface of piston 3 and the outer periphery of first flange plate 11 are increased to abut, which improves the reliability of the device.

[0070] The detection method is: placing detection plate 12 at the detection position of piston 3, so that the groove wall of piston groove 9 is embedded in detection groove 13;

[0071] Pushing detection plate 12 towards the direction of the groove bottom of piston groove 9 until detection plate 12 cannot be moved;

[0072] If the groove bottom of detection groove 13 and the other side groove wall of detection groove 13 respectively abut the other end surface of piston 3 and the outer periphery of first flange plate 11 at this time, it is determined that the remaining thickness is unqualified, otherwise it is determined that the remaining thickness is qualified.

[0073] The above has described the embodiments of the present application, the above description is exemplary, not exhaustive, and is not limited to the disclosed embodiments. Many modifications and changes are obvious to those skilled in the art without departing from the scope and spirit of the described embodiments.

Claims

1. A method for detecting the remaining wall thickness during the machining of a railway brake cylinder piston, comprising a device for detecting the remaining wall thickness during the machining of a railway brake cylinder piston, characterized in that, The piston has multiple bolt holes for mounting pawl spring plates on one end face, and a piston groove on the other end face. The groove wall has a draft angle, which is connected to the bottom of the groove via an arc surface. An annular first rib is provided on the outer periphery of the piston. The distance between the bottom edge of the bolt hole and the perpendicular to the arc surface is the minimum remaining wall thickness of the piston. The device is characterized by comprising: A detection plate, wherein a detection groove is provided on one side of the detection plate, and the groove wall, bottom and other side wall of the detection groove are connected in sequence to form a U-shape. The length of one side wall of the detection groove is not greater than the first vertical distance between the other end face of the piston and the vertical foot, and the width of the bottom of the detection groove is not greater than the second vertical distance between the outer periphery of the first prism and the vertical foot. The method includes: Place the detection plate at the detection position of the piston so that the groove wall of the piston groove is embedded in the detection groove; Push the detection plate toward the bottom of the piston groove until the detection plate can no longer move; If the bottom of the detection groove and the other side wall of the detection groove are in contact with the other end face of the piston and the outer peripheral surface of the first prism plate, respectively, the remaining thickness is deemed unqualified; otherwise, the remaining thickness is deemed qualified.

2. The method for detecting the remaining wall thickness during the machining of a railway brake cylinder piston according to claim 1, characterized in that, A second prism is provided on the outer periphery of the piston near the first prism, and a lubrication sleeve mounting groove is formed on the outer periphery of the piston between the first prism and the second prism.

3. The method for detecting the remaining wall thickness during the machining of a railway brake cylinder piston according to claim 2, characterized in that, A third prism is provided on the outer periphery of the piston near the second prism, and a sealing ring mounting groove is formed on the outer periphery of the piston between the second prism and the third prism.

4. The method for detecting the remaining wall thickness during the machining of a railway brake cylinder piston according to claim 1, characterized in that, One end face of the piston is provided with an annular mounting surface, which is used to provide multiple bolt holes for mounting pawl spring plates.

5. The method for detecting the remaining wall thickness during the machining of a railway brake cylinder piston according to claim 1, characterized in that, A mounting boss extends from the middle of the other end face of the piston, and the end of the mounting boss is provided with a mounting groove.

6. The method for detecting the remaining wall thickness during the machining of a railway brake cylinder piston according to claim 1, characterized in that, The distance between the bottom of the bolt hole and one end face of the piston is a constant.

7. The method for detecting the remaining wall thickness during the machining of a railway brake cylinder piston according to claim 3, characterized in that, The distance between the center of the bolt hole and the mounting groove of the sealing ring is a fixed value.

8. The method for detecting the remaining wall thickness during the machining of a railway brake cylinder piston according to claim 3, characterized in that, The distance between the outer peripheral surface of the first prism and the outer peripheral surface of the second prism is a fixed value, and the distance between the outer peripheral surface of the first prism and the outer peripheral surface of the third prism is a fixed value.

9. The method for detecting the remaining wall thickness during the machining of a railway brake cylinder piston according to claim 1, characterized in that, The distance between one end face of the piston and the other end face of the piston is a constant value.

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