對于稱重量較大的升降貨梯http://m.zjfutures.cn/的液壓系統中要使兩個或兩個以上的液壓缸，在運動中保持相同位移或相同速度的回路稱為同步回路。在一泵多缸的系統中，盡管液壓缸的有效工作面積相等，但是由于運動中所受負載不均衡，升降貨梯摩擦阻力也不相等，泄漏量的不同以及制造上的誤差等，不能使液壓缸同步動作。加裝同步回油閥的作用就是為了克服這些影響，補償它們在流量上所造成的變化。 升降貨梯在使用中主要靠系統支持，尤其是升降機的液壓系統十分重要，貫穿著使用的整個過程，那么同步回路又有著怎樣的定義呢?
Said hydraulic system for greater weight of cargo lifter to make two or more cylinders, displacement remains the same or the same speed in the movement called synchronization loop circuit. In a multi-cylinder pump system, although the effective working area of the cylinder are equal, but suffered due to the movement of the load imbalance, cargo lifter friction is not the same, different and other manufacturing error on the amount of leakage, can not make hydraulic cylinder synchronous action. Synchronization return valve installation role is to overcome these effects, compensate them on the flow caused by changes. Cargo lifter in use, mainly by system support, especially a hydraulic lift system is important, throughout the entire process is used, it has a kind of synchronization loop definition?
升降貨梯串聯液壓缸的同步回路。第一個液壓缸回油腔排出的油液，被送入第二個液壓缸的進油腔。如果串聯油腔活塞的有效面積相等，便可實現同步運動，這種回路兩缸能承受不同的負載，但升降貨梯泵的供油壓力要大于兩缸工作壓力之和。
Cargo lifter series hydraulic cylinder synchronization circuit. The first hydraulic cylinder oil return drained fluid chamber is fed into the second hydraulic cylinder into the oil chamber. If the effective area of the oil chamber piston series of equal, you can synchronize the movement, this circuit two cylinders can withstand different loads, but cargo lift pump supply pressure is greater than the sum of the two-cylinder operating pressure.
由于升降貨梯http://m.zjfutures.cn/泄漏和制造誤差，影響了串聯液壓缸的同步精度，當活塞往復多次后，會產生嚴重的失調現象，為此要采取補償措施。是兩個單作用缸串聯，并帶有補償裝置的同步回路。
Since cargo lifter leak and manufacturing errors, affecting the serial hydraulic cylinder synchronization accuracy, when reciprocating times, will have serious imbalances, compensatory measures to be taken to this end. Two single-acting cylinder is connected in series with a synchronization loop compensation device.
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