›› 2012, Vol. ›› Issue (06): 1396-1401.

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Analysis of commutation impact in hydraulic system of hydraulic rolling shear

MA Li-feng1,2, HAN He-yong1, HUANG Qing-xue1, WANG Jing1, ZHOU Yan1   

  1. 1. Taiyuan University of Science and Technology, Heavy Machinery Engineering Research Center of the Ministry of Education, Taiyuan 030024, China;
    2. Superplastic and Plastic Research Institute, Jilin University, Changchun 130022, China
  • Received:2011-12-07 Online:2012-11-01

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Abstract: The pressure equilibrium equations in the hydraulic cylinder were derived for the hydraulic rolling shear according to its structure. The pressure impacts in 2 cases, the one uses a symmetric valve to control an unsymmetric cylinder, the other uses an unsymmetric valve to control an unsymmetric cylinder, were compared by solving the 2 chamber pressures before and after the commutation. The hydraulic commutation impacts in the hydraulic cylinders in both cases were simulated by software and it was found that the latter case is characterized by less impact than the former case, which is in good agreement with the results of theoretical calculation. An improved hydraulic system was designed based on the simulation results to improve the operation satety of the equipment. The collected in-situ data of 2 chamber pressures of a prototype shear proved that using an unsymmetric valve to control an unsymmetric cylinder can alleviate the commutation impact effectively.

Key words: hydraulic transmission and control, hydraulic system model, pressure impact

CLC Number: 

  • TH137
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