How to solve the pressure overload of car bumper hydraulic press

Car bumper hydraulic press is also called car bumper press forming hydraulic press, it will inevitably appear in the working process of excessive pressure phenomenon, because of excessive pressure caused by a series of conditions, we call the hydraulic press pressure overload phenomenon. So how to solve the pressure overload of the car bumper hydraulic press?

Hydraulic press in the case of no load, often the situation of pressure overload (reversing motor suddenly can not turn up) This may also be a relatively "classic" hydraulic topic: pay attention to the "transition function" of the reversing valve, in the reversing process, may go through a period of "fully closed" process, the pump mouth has no way out, the pressure "unlimited" rise, the motor overload.

But we can not clearly know that this will happen, or let him happen, so at the beginning of the design of the four-column hydraulic press, in order to minimize the damage of this problem, we will set up a hydraulic overload protection system.

The hydraulic overload protection system of the automobile bumper hydraulic press has been replaced for many generations, and the old overload protection device in the mechanical hydraulic press, such as the collapse block type, is gradually eliminated because it cannot accurately signal and effectively protect the machine tool, and the replacement is very troublesome. It is replaced by a hydraulic overload protection system with fast unloading and recovery.

When the height of the mold is improperly adjusted or there is double material, the bumper oil pressure will be overloaded. At this time, the pressure in the hydraulic cylinder rises sharply, and the pressure in the high-pressure chamber of the unloading valve is greater than the back pressure in the back pressure chamber, which pushes the piston down to open the oil return port, and the hydraulic oil quickly drains back to the tank. Under the action of the balancer, the slide block moves up to protect the press and die from damage while the pressure relay and stroke switch operate, cut off the clutch control line, the press stop solenoid valve closes the air source and quickly drains the air from the back pressure chamber of the unloading valve.