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Vacuum detection method and device for abraded surface leakage of slide valves of railway brake

A technology of brakes and slide valve pairs, which is applied in the direction of liquid tightness measurement using liquid/vacuum degree, and by measuring the increase and deceleration rate of fluid, etc., which can solve problems such as inapplicable production process control, hidden quality problems, and low efficiency

Inactive Publication Date: 2013-01-02
沈阳西屋制动科技有限公司
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AI Technical Summary

Problems solved by technology

If it is unqualified, it needs to be disassembled and ground again before assembly and testing, which is time-consuming and laborious, and brings inconvenience to normal production
And when assembling, silicone oil should be applied between the spool valve pairs, the silicone oil can improve the sealing performance of the spool valve pairs, so this kind of test result also has certain unreality, and it is impossible to judge whether the test result is true or not
This brings quality hazards to the subsequent use of the product
If the simulated working state is used to detect without oil, because the pressure air is used for detection, it involves complicated installation and sealing problems, the efficiency is low, and it is not suitable for production process control

Method used

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  • Vacuum detection method and device for abraded surface leakage of slide valves of railway brake

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Embodiment Construction

[0022] A method for detecting vacuum leakage on a secondary grinding surface of a slide valve of a railway brake, comprising the following steps:

[0023] 1) Spool valve leakage detection: Fit the grinding surface of the 120 spool valve or 120-1 spool valve to the precision-ground detection seat, and the cavity on the spool valve is divided into three parts: front, middle and rear, and each part of the cavity is connected to the The cavities on the detection seat correspond to each cavity, vacuumize each cavity for 10 seconds, turn off the vacuum pump and keep the pressure for 10 seconds, the leakage of each cavity is not greater than 10KPa;

[0024] 2) Valve sleeve leakage detection: place the main valve body of the 120 valve or 120-1 valve on the test bench, the semi-automatic relief valve faces to the left, put the valve sleeve detection seat into the valve body, turn on the vacuum pump, and vacuum for 5 seconds Finally, turn off the vacuum pump, keep the pressure for 10S, ...

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Abstract

The invention relates to a vacuum detection method for abraded surfaces of slide valves of railway brake. The vacuum detection method for abraded surfaces of slide valves of the railway brake includes the steps of firstly, detecting leakage of the slide valves; secondly, detecting leakage of valve sleeves; thirdly, detecting fitting test leakage; and fourthly, detecting backflow hole flux. A vacuum detection device for abraded surfaces of slide valves of the railway brake is used to detect airtightness of abraded surfaces of the slide valves, the slide valve sleeves and the like according to the principle of vacuum absorption, performances of the abraded surfaces of the slide valves can be reflected quickly, simply and accurately, test procedures are simplified, pass percentage of one-time assembly is increased, production efficiency is improved, and product quality is improved.

Description

technical field [0001] The invention relates to a vacuum detection method and equipment for detecting the leakage of the grinding surface of the auxiliary grinding surface of the slide valve of a railway brake machine, which is used to detect the sealing performance of the grinding surface of the main parts slide valve and slide valve sleeve in the 120 and 120-1 type freight car air control valves equipment. Background technique [0002] Railway brakes use compressed air as the medium to control the braking or release of locomotives and vehicles. Its sealing performance is very important. The slide valve pair is the core component of the railway brake, and its quality level directly determines the performance of the brake. The spool valve pair is divided into two parts, one is the spool valve, and the other is the spool valve seat (both the spool valve sleeve). The spool valve moves on the spool valve sleeve. Both the spool valve and the spool valve sleeve have air passag...

Claims

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Application Information

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IPC IPC(8): G01M3/26
Inventor 刘兵李克钧李维邦范秋丽梁莹张国才郭吉春
Owner 沈阳西屋制动科技有限公司
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