Shanghai high pressure valve test bench testing analysis:

To the original: valve test-bed at http://www.dsyyjx.com/ With the rapid development of Shanghai economy, the use of valve test bench is very extensive. In electric power, oil field, oil refining, petrochemical, chemical, shipbuilding, steel, metallurgy, machinery manufacturing industries such as construction, cement, construction, testing equipment, such as work, the pressure of the valve test bench for large size valves pressure and disassembly is a very important tool. An alternative with other tools. Not only easy to use and lighter, and the torque provided huge and very accurate. Torque repeat accuracy is + / - 3%. According to the statistics, about 50% in the equipment operation fault was caused by a bolt failure, at the same time due to problem of bolt equipment the number of major accidents is very large, so the pressure equipment, testing process, on the bolts and remove the torque in the vast majority of cases are more strict, and using artificial method is to meet the requirements. Large specification of torque to provide to the bolt, the valve test bench is the ideal choice. The valve test-bed is mainly divided into two categories: driving wrench and hollow valve test bench. The diagram below: 1, valve test-bed optimization methods, basic condition and experimental method Valve test-bed in the construction process of commonly used in narrow space and transportation is very convenient location, thus the volume and weight of the wrench is one of the most important indicators. To the size of the smaller parts, high strength alloy material and heat treatment is a common method. Design was optimized by using finite element analysis (finiteelementanalysis) at the same time, to reduce the size and weight of the component, is also a very important one annulus. This article from the two aspects to analyze the valve test bench size optimization. At the same time, how to get high quality products, based on the basic of the manufacturing conditions, experimental methods and some paper. For high pressure valves detection with high suppression method to achieve the size and weight of the parts is reduced. Due to the current global trade widely, to find the difficulty of the high strength material is not very big, but due to into a improving strength, must also take heat treatment and surface treatment, in hope to achieve more than 1000 mpa components strength and stability, and to the uniformity of material strength is highly demanding (mainly due to hydraulic drive wrench is influenced by the irregular internal parts), the current domestic enterprises is difficult to the strength of the internal parts for hydraulic drive wrench reached more than 1000 mpa, even can achieve individual, also it is difficult to achieve the stability of the batch. You also need to learn a lot from the same products abroad, in a long period of time, put in more manpower and money, in the material and heat 1.2 valve test-bed design method Based on finite element analysis and optimal design method mainly adopt discretization calculation to modified design, in order to achieve optimal design. Taken after the main calculation principle is: discrete h - elements (further subdivision mesh) and p - element (improve) order to achieve the convergence. For hydraulic drive internal ratchet wrench of FEA mechanical calculation, local stress has more than 1000 mpa. Due to the rapid development of the computer now, because of the great amount of calculation caused by mesh refinement is not a problem. On the hand, no bottleneck problem for the accuracy of calculation. But internal parts because of hydraulic drive wrench is relatively complex, and hard to a given boundary condition, contact condition is difficult to simulate with a given, thus calculated can only be taken as reference to the design and experiment, can't completely rely on, should be in a number of boundary condition in the model error and the results of the analysis, step by step to find reliable data, and compared with the corresponding experimental results. 1.3 valve test-bed basic conditions Due to valve test-bed involves high strength material and high hydraulic pressure (now the mainstream pressure valve test bench is 70 mpa) from two aspects of demands, and so on some basic conditions of requirements as a whole is very high. The current domestic product compared to similar foreign products in weight, appearance, life span, function etc. There are still some gaps. From making, although some domestic high quality CNC, but lack of some aspects of management and technology accumulation, now produce parts, there are quality unstable factors. At the same time for high strength material, high pressure hydraulic seals, high pressure joint related basic materials such as still rely on imports. 1.4 experiment method Both domestic and international products and there is no about valve test-bed test standard, test (function experiment, life experiment, reliability test, etc.) is to determine the basic requirements of product quality, also is the basic requirement of the product to the market before, although there is no standard products and special valve test-bed experiment. We can still from some domestic and foreign some standard (for example, AMSIB30.1 ANSIB107, etc.) for related technical key points to work out some standard on the products of the enterprise. This link is the key point of research and development ability of an enterprise, product quality and reliability of the premise of guarantee. 2 the conclusion and prospect Optimization method proposed in this paper, the valve test-bed, through this article involves two aspects (material, FEA) related discussion, preliminary analysis how to make the size and weight of valve test bench is the most important indicators to achieve the ideal effect. For the world at present the most advanced valve test-bed for tracking and analysis, for the domestic current on the technology development, the long-term grope and experimental suggestion were put forward.