The functions of each actuator of the hydraulic press must be known

  As we all know, the working principle of a hydraulic press is to convert hydraulic energy into mechanical energy, so we must be familiar with the functions of each hydraulic component during the conversion. We must know that the hydraulic solenoid valve on the hydraulic press is the basic component of automation used to control fluids and is an actuator. ; Not limited to hydraulic and pneumatic. Solenoid valves are used to control the direction of hydraulic flow. Factory mechanical devices are generally controlled by hydraulic cylinders, so solenoid valves are used.

  Hydraulic solenoid valve refers to the component used to control liquid pressure, flow and direction in hydraulic transmission. Among them, those that control pressure are called pressure control valves, those that control flow are called flow control valves, and those that control on/off and flow direction are called directional control valves.

 

1.The flow control valve adjusts the flow rate by adjusting the orifice area between the valve core and the valve body and the local resistance it generates, thereby controlling the movement speed of the actuator. Flow control valves are divided into 5 types according to their uses.

 

(1)Diverter valve: Regardless of the size of the load, an equal-volume diverter valve or a synchronization valve can make two actuators of the same oil source obtain equal flow; a proportional diverter valve can obtain a proportional distribution of flow.

 

(2)Diverter and collector valve: It has the functions of diverter valve and collector valve.

 

(3)Throttle valve: After adjusting the throttle opening area, the movement speed of the actuator with little change in load pressure and low requirements on movement uniformity can be basically kept stable.

 

(4)Collector valve: Its function is opposite to that of the diverter valve, so that the flow flowing into the collector valve is proportionally distributed.

 

(5)Speed ​​regulating valve: It can keep the inlet and outlet pressure difference of the throttle valve at a constant value when the load pressure changes. In this way, after the throttle area is set, no matter how the load pressure changes, the speed regulating valve can maintain the flow rate through the throttle valve unchanged, thereby stabilizing the movement speed of the actuator.

 

2.Pressure control valves are divided into relief valves, pressure reducing valves and sequence valves according to their uses.

 

(1)Sequence valve: After one actuator (such as a hydraulic cylinder, hydraulic motor, etc.) operates, other actuators can be operated in sequence. The pressure generated by the oil pump first pushes the movement of hydraulic cylinder 1, and at the same time acts on area A through the oil inlet of the sequence valve. When the movement of hydraulic cylinder 1 is complete, the pressure rises, and the upward thrust acting on area A is greater than the setting of the spring. After the value, the valve core rises to connect the oil inlet and the oil outlet, causing the hydraulic cylinder 2 to move.

 

(2)Pressure reducing valve: It can control the branch circuit to obtain a stable pressure lower than the main circuit oil pressure. According to the different pressure functions it controls, pressure reducing valves can be divided into fixed value pressure reducing valves (the output pressure is a constant value), fixed difference pressure reducing valves (the difference between input and output pressure is a fixed value) and fixed ratio pressure reducing valves. (Maintain a certain ratio between input and output pressure).

 

(3)Relief valve: It can control the hydraulic system to maintain a constant state when the set pressure is reached. The relief valve used for overload protection is called a safety valve. When a system failure occurs and the pressure rises to a limit value that may cause damage, the valve port will open and overflow to ensure the safety of the system.

 

3.Directional control valves are divided into one-way valves and reversing valves according to their uses.

 

（1）Directional valve: Change the on-off relationship between different pipelines. According to the number of working positions of the valve core in the valve body, it is divided into two-way, three-way, etc.; according to the number of controlled channels, it is divided into two-way, three-way, four-way, etc. Five-way, etc.; according to the valve core driving mode, it is divided into manual, motorized, electric, hydraulic, etc.

 

（2）One-way valve: only allows fluid to be connected in one direction in the pipeline, and is cut off in the reverse direction.

Features

 

（1）The action is fast, the power is small, and the appearance is lightweight.

 

（2）external leakage is blocked, internal leakage is easy to control, and IT is safe to use.

 

（3）External leakage is blocked, internal leakage is easy to control, and it is safe to use.