重慶升降機液壓系統中有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，升降機摩擦阻力也不相等，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。同步回路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。
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.

升降平臺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，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，但升降平臺泵的供油壓力要大于兩缸工作壓力之和。
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，因此采取兩個單作用缸串聯，并帶有補償裝置的同步回路。
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.