重庆升降机液压系统中有两个或两个以上的液压缸，在运动中保持相同位移或相同速度的回路称为同步回路。在一泵多缸的系统中，尽管液压缸的有效工作面积相等，但是由于运动中所受负载不均衡，升降机摩擦阻力也不相等，泄漏量的不同以及制造上的误差等，不能使液压缸同步动作。同步回路的作用就是为了克服这些影响，补偿它们在流量上所造成的变化。
Ningbo hydraulic lifting platform system has two or more cylinders, displacement remains the same or the same speed in the movement known as the synchronization loop circuit. In a multi-cylinder pump system, although the effective working area of the hydraulic cylinder are equal, but due to load imbalance suffered movement, frictional resistance is not equal to the lift, as well as different manufacturing error or the like on the amount of leakage, can not make the hydraulic cylinder synchronized action. Synchronous circuits role is to overcome these effects compensate them for the traffic caused by the change.

升降平台在使用中主要靠系统支持，尤其是升降机的液压系统十分重要，贯穿着使用的整个过程，第一个液压缸回油腔排出的油液，被送入第二个液压缸的进油腔。如果串联油腔活塞的有效面积相等，便可实现同步运动。这种回路两缸能承受不同的负载，但升降平台泵的供油压力要大于两缸工作压力之和。
Ningbo lifting platform in use, mainly by system support, especially hydraulic lift system is very important to use throughout the entire process, the first hydraulic cylinder oil return drained fluid chamber, is fed into the second hydraulic cylinder oil chamber. The effective area of the oil chamber of the piston if the series are equal, you can synchronize the movement. This circuit can withstand two cylinders of different loads, but the oil pressure pump Ningbo lifting platform is greater than the sum of the two-cylinder operating pressure.

由于泄漏和制造误差，影响了串联液压缸的同步精度，当活塞往复多次后，会产生严重的失调现象，因此采取两个单作用缸串联，并带有补偿装置的同步回路。
Because Ningbo lifting platform leak and manufacturing errors, the impact of a series of hydraulic cylinders synchronization accuracy, when the piston reciprocating times, will have serious imbalances, so take a series of two single-acting cylinders, and with synchronous loop compensation device.