What are the overload protection devices of CNC hydraulic press

The old overload protection device in CNC hydraulic press, such as the collapse block type, is gradually eliminated because it can not accurately signal and effectively protect the machine tool, and it is very troublesome to replace. It is replaced by a hydraulic overload protection system with fast unloading and recovery.

The overload protection system of hydraulic press is generally composed of pneumatic pump, unloading valve, pressure relay, solenoid valve, pressure gauge and other components.

When the pressure of the CNC hydraulic press exceeds the specified range during the operation, it is called overload, which will cause a series of conditions. In order to reduce the harm of this problem to a small amount, the hydraulic overload protection system is usually set up in the CNC hydraulic press, and this system is constantly updated with the progress of technology, so the effect is absolutely guaranteed.

When overloaded, the pressure in the hydraulic cylinder of the CNC hydraulic press will rise sharply, and the pressure of the high-pressure chamber of the unloading valve will push the piston down to open the oil return port, and the hydraulic oil will quickly leak back to the tank. Under the action of the balancer, the slide block will protect the press and die from damage; At the same time, the pressure relay and the travel switch operate, and the operation will stop after cutting off the line.

Although there is protection of the protection system, the load of the CNC hydraulic press exceeds the range of this protection, which will also cause damage to the CNC hydraulic press, so it is very basic that it should be operated in accordance with the specification to avoid the occurrence of this problem.