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在校正零件或产品的液压校直机以及其它液压动力机械中,校直头模具或工作主轴滑座在未接触工件前,经常要求作快速低压的趋近运动,而在接触了工件开始工作时,需即转入慢速高压的工作进给,一般常采用低压大流量与高压小流量双泵液压系统来实现上述动作,系统较复杂,操作时注意力需高度集中。现介绍为某汽车制造厂设计制造的立式和卧式液压校直机单泵自控系统。该系统经过长期使用,达到压力和速度自控转换的要求。其液压工作原理如附图所示。当缸体上的模具快速向下接触到工件开始工作时,它立即自动转换成慢速的工作压力回路。系统的调整要求 (1)测定克服油缸体及其模具的自重、活塞与缸
In calibrating parts or products of hydraulic straightening machines and other hydraulic power machines, alignment head dies or work spindle slides often require rapid, low-pressure approach before they touch the workpiece, and upon contact with the workpiece to begin work , Need to turn into the work of slow high-pressure feed, generally use low-pressure high flow and high pressure small flow double-pump hydraulic system to achieve the above-mentioned action, the system is more complex, the attention needs to be highly concentrated operation. Now introduced for a car factory design and manufacture of vertical and horizontal hydraulic straightening machine single pump control system. The system after long-term use, to achieve the pressure and speed of automatic conversion requirements. The hydraulic principle as shown in the figure. When the cylinder on the mold quickly down to contact the workpiece to start working, it immediately automatically converted to a slow working pressure circuit. System adjustment requirements (1) Determination of overcoming the weight of the cylinder block and its mold, piston and cylinder