定扭矩螺栓自動調(diào)定裝置的研究
[Abstract]:Thread connection is the most widely used connection mode in mechanical industry at present, because it has a series of advantages: thread adjustment can produce great axial force; Simple manufacturing, high precision, mass production through standardization, low cost and interchangeability. In order to increase the rigidity, compactness, anti-loosening ability of thread connection and prevent sliding of bolt connection under transverse load, most thread joints should be preloaded during assembly. Generally, the pretightening force of bolts is controlled by adjusting the torque, but the error of this method is too large to achieve accurate control. With the development of science and technology, the control requirements of bolt pre-tightening force are becoming higher and higher. Many new bolts have been produced, one of which is fixed torque bolt, which has the function of loosening and monitoring and can realize accurate control of rated torque. In this paper, a set of automatic adjusting device of fixed torque bolt is designed, through which the fixed torque bolt can be installed, and the pretightening force of bolt can be controlled accurately, and the relative error is less than 5%. The main contents of this paper are as follows: (1) each part of the fixed torque bolt adjusting device includes the bolt stretching part, the driving part, the control part and the scheme of the adjusting mechanism. Based on this, the overall scheme is determined. (2) the calculation and selection of each part of the fixed torque bolt setting device is carried out, and the structure of each part is determined, finally the overall structure is given. (3) the circuit diagram of the control and drive parts is designed. The corresponding control program is compiled by programming software STEP 7 Micro-WIN32. (4) using AMESim and MATLAB, the factors that affect the control precision of the automatic setting device of fixed torque bolt are simulated and analyzed. The relative error is not more than 5.
【學(xué)位授予單位】:西南交通大學(xué)
【學(xué)位級別】:碩士
【學(xué)位授予年份】:2011
【分類號】:TH131.3
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