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Testing system and testing method for air tightness of main valve body component of 120 valve

An air tightness test, main valve body technology, applied in the direction of using liquid/vacuum degree for liquid tightness measurement, by measuring the acceleration and deceleration rate of fluid, etc., can solve the sealing reliability of clamping and micro leakage slide valve sleeve The problems such as the failure to detect the leakage of the gas path and the atmosphere, affecting the pass rate of the first-time inspection of the final assembly, and the inability to quantify the leakage value, achieve the effect of fast sealing, low cost and strong function

Active Publication Date: 2015-03-04
MEISHAN CRRC BRAKE SCI & TECH CO LTD
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  • Abstract
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  • Application Information

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Problems solved by technology

However, due to the irregular structure of the valve body and the large number of air passages, problems such as clamping, detection and value of micro-leakage, sealing reliability of the slide valve sleeve, and leakage detection between the air passage and the atmosphere have been difficult for a long time. not resolved
The automation degree of the test equipment currently used is relatively poor. The leakage judgment and pressure holding time are mainly controlled and judged by the operator subjectively. The leakage value cannot be quantified. There are problems such as missed inspections and wrong judgments, which may easily cause the outflow of unqualified products and affect the pass rate of the first-time inspection of the final assembly

Method used

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  • Testing system and testing method for air tightness of main valve body component of 120 valve
  • Testing system and testing method for air tightness of main valve body component of 120 valve

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Embodiment Construction

[0026] A 120-valve main valve body constitutes an airtight test system, such as figure 1 and figure 2 As shown, it includes: double-needle pressure gauge 1, pressure regulating valve 2, air storage cylinder 3, stable air cylinder 4, differential pressure gauge 5, pressure transmitter 6, two-position three-way solenoid valve (21, 31, 41 , 51, 61, 71, 23, 33, 43, 53, 63, A, D), micro transmitter 8, cylinder 9, two-position five-way solenoid valve 10, copper tube 11, two-position two-way solenoid valve (22, 32, 42, 52, 62, E), a control system composed of programmable logic controller (PLC) and programmable touch screen, and an actuator composed of cabinet, bench, clamping mechanism and sealing structure. in:

[0027] The programmable logic controller (PLC) is the central control unit of the test system, which realizes functions such as logic control of each solenoid valve, test data detection, calculation, judgment and storage.

[0028] The programmable touch screen performs...

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Abstract

The invention discloses a testing system and a testing method for the air tightness of a main valve body component of a 120 valve. Leakage between inner air channels is detected through a trace transmitter, and detection accuracy reaches as high as 2.5Pa. Leakage between the inner air channels and the atmosphere is detected through a differential pressure gauge, so that the detection accuracy of the air tightness is greatly improved. A micro-fluidic scheme is adopted for the testing system, and the whole testing process is automatically executed through programs without the influence of human factors, so that the phenomena of erroneous judgment and missing judgment are avoided. A control system and an execution mechanism of the testing system are separated, the control system is universal, and can be jointed with an execution mechanism of a corresponding product to test the air tightness of other products. The testing system is stable in performance, reliable in sealing and convenient to operate, and has a misoperation prevention function.

Description

technical field [0001] The invention relates to a test system, in particular to an air tightness test system and a test method for a 120-valve main valve body. Background technique [0002] The main valve body of the 120 valve is composed of a complex valve body structure, which is composed of the main valve body, slide valve sleeve, emergency second-stage valve upper sleeve, partial reduction valve sleeve, check valve seat and other components. Its airtight quality is the key control element of product performance and quality, so the product technical requirements and corresponding manufacturing technical conditions clearly require piece-by-piece testing. However, due to the irregular structure of the valve body and the large number of air passages, problems such as clamping, detection and value of micro-leakage, sealing reliability of the slide valve sleeve, and leakage detection between the air passage and the atmosphere have been difficult for a long time. Not resolved....

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01M3/28
Inventor 周超洪代长春余越川曾强
Owner MEISHAN CRRC BRAKE SCI & TECH CO LTD
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