The Research Of 120 Distributing Valve Test Performance And Standard On Two Test Rigs

In order to meet the railway speed-up of heavy-duty truck brake system performance requirements, and further improve the railway goods manufacturing, quality inspection to ensure safety of rail transport, the ministry of railways re-formulated the "rules of the railway vehicle brake overhaul," and had come into effect in March 2008. 120-type air control valves were used on railway freight car at this stage the main-valve, the new "Railway truck brake overhaul rules" promulgated before the depot has been used 705-type test-bed for their test, the corresponding test methods and quality standards is to 705-type test-bed for the foundation have been made. New "rules of the railway vehicle brake overhaul" following the introduction, explicitly put forward the 120-type vehicle air control valve test bench test methods and 120 test-bed basic requirements, which means valve 120 then have to carry out maintenance in accordance with this request. Units of two pilot test methods and standards are very different, these differences in braking performance of vehicles which have the impact of new standards in relation to the original test method and its standard is to enhance or reduce the requirements and so on, these are very important research topics.Because of conditions, a large number of 120 valve test stand at the two-Test to compare, especially to look for in a standard valve borders very difficult, so all through the test method of two difference i n the performance test stand, and then study the two Equivalent Units of test standards are unrealistic.On the first side brake chamber through the depot to test data acquisition, and then through the collection of data and simulation system for computing data for comparison, verification of computer simulation system software simulation test bed to test two types of reliability. This article assumes that different tests produce the same valve performance was mainly attributable to manufacturing tolerances (such as valve aperture tolerances) and the physical parameters of tolerance (such as spring stiffness deviation difference in the installation of the load) and so on. According to the structural analysis of the impact of valve 120 for each single-valve test possible factors, the use of simulation system for simulation of each test the impact of factors on the extent and patterns of influence to identify the main factors. Through the simulation software to carry out simulation tests to identify two differences between standard and 120 the specific impact of the results of valve performance.standards have to brake chamber conditions.