The speed control circuit is a circuit that controls the movement speed and speed switching of the actuator in the hydraulic system of the hydraulic lifting platform. The main control methods include valve control, pump control, and actuator control. The commonly used speed control circuits include speed control circuit, fast circuit, and speed switching circuit.
The basic principle of the speed control circuit hydraulic system often requires adjusting the speed of the hydraulic cylinder and motor to meet the needs of the main engine's working cycle. The speed of hydraulic cylinders and motors depends on the displacement and input flow rate. It can be seen that in order to control the speed of the cylinder and motor, it can be achieved by changing the inflow flow rate or displacement.
It is not practical to adjust the speed of hydraulic cylinders in hydraulic lifting platforms by changing their effective area (equivalent to displacement). Generally speaking, the method of changing traffic can only be used to adjust speed. For variable displacement motors, speed regulation can change the flow rate and motor displacement.
Therefore, today I will tell you that there are three main ways to control the speed circuit:
1. Volume speed control circuit: Adjust the displacement of the variable displacement pump or motor to speed control;
2. Throttle speed control circuit: The flow valve is used to regulate the flow in and out of the actuator, achieving speed control provided by the quantitative pump.
3. The flow throttling speed control circuit uses a pressure limiting variable pump to supply oil, and adjusts the flow entering the actuator through a flow valve to match the flow of the variable pump with the flow of the control valve, achieving speed control. In addition, multiple quantitative pumps can be used in parallel to start one or more pumps for oil supply according to different speed requirements, achieving graded speed regulation.
That's all for today's introduction to hydraulic lifting platforms. If you want to know more, please consult our website.
