The speed control circuit is a circuit that controls the movement speed and speed switching of the actuator in the hydraulic system of the guide rail hydraulic lifting platform. The main control methods include valve control, pump control and actuator control. Common speed control circuits include speed control circuit, high-speed circuit and speed switching circuit.

液压货梯厂家提醒液压升降货梯调速回路的基本原理系统常常需要调节液压缸和液压马达的运动速度，以适应主机的工作循环需要。液压缸和液压马达的速度取决于排量和输入流量。可以看出，通过改变流量或排量，可以控制气缸和电机的速度。

The manufacturer of the hydraulic freight elevator reminds the basic principle of the speed regulating circuit of the hydraulic lift freight elevator. The system often needs to adjust the movement speed of the hydraulic cylinder and the hydraulic motor to meet the working cycle needs of the host machine. The speed of the hydraulic cylinder and the hydraulic motor depends on the displacement and the input flow. It can be seen that the speed of the cylinder and motor can be controlled by changing the flow or displacement.

对于液压升降货梯中液压缸来说，通过改变其作用面积A(相当于排量)来调速是不现实的，一般只能用改变流量的方法来调速。对变量马达来说，调速既可以改变流量，也可改变马达排量。

For the hydraulic cylinder in the hydraulic elevator, it is unrealistic to adjust the speed by changing its action area a (equivalent to the displacement). Generally, the speed can only be adjusted by changing the flow. For variable speed motor, speed regulation can change both flow and motor displacement.

因此，液压货梯批发厂家提醒调速回路主要有以下三种方式：

Therefore, the wholesaler of hydraulic freight elevator shall remind the speed regulating circuit in the following three ways:

1、节流调速回路：通过定量泵供油，利用流量阀调节进出执行机构的流量，实现调速；

1. Throttling and speed regulating circuit: the oil is supplied by the quantitative pump, and the flow in and out of the actuator is regulated by the flow valve to realize speed regulation;

2、在体积节流调速回路中，由限压变量泵供油，由流量阀调节进入执行器的流量，使变量泵的流量适应调速阀的调节流量。

2. In the volume throttling speed regulating circuit, the pressure limiting variable pump supplies oil, and the flow into the actuator is regulated by the flow valve to make the flow of the variable pump adapt to the regulated flow of the speed regulating valve.

3、容积调速回路：用调节变量泵或变量马达的排量来调速；

3. Volume speed regulating circuit: regulate the speed by adjusting the displacement of variable pump or variable motor;

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