具有阀控泄油补偿的等容泵控液压同步系统

针对常规等容泵控液压同步回路精度偏低的问题，提出了一种高可靠性、低成本的解决方案.在常规等容泵控液压同步回路中液压泵的压力管路上各设置一个由高速开关阀构成的泄油支路.通过对各高速开关阀的脉宽调制控制，实现了多个液压缸的高精度同步.给出了详细的液压系统原理图以及同步控制方法.该方案已应用于某轧机入口导卫装置的双缸同步系统中，设备连续运行了近一年时间，绝对同步误差控制在15mm以内.实践表明，该方案简单、实用，具有推广价值.

Equal-Displacement Pump Controlled Hydraulic Synchronous System Compensated by Valve Controlled Oil Spill Branch

A highly reliable and low cost solution was put forward to solve the poor precision problem of the conventional equal displacement pump controlled synchronous circuit. An oil spill branch， made of a high speed on off valve， was added on each pump’s pressure pipeline of the conventional circuit. By using the PWM (pulse width modulation) method to control each high speed on off valve， high precision multi cylinder synchronization was realized. Detailed hydraulic principle diagram and the synchronization control method were presented as well. The scheme has been used in a two cylinder synchronous system of a mill entrance guide device for nearly one year， with the synchronous absolute error being kept under 15mm. The practical results showed that the scheme is worth promoting for its simplicity and practicality.