An implosion-type overload protection device and method for a press

Abstract

An implosion-type overload protection device for a press, comprising a ball head for a press, the ball head is matched and connected with a ball bowl, the ball bowl is matched and connected with an oil cylinder; a pressure cavity is arranged between the ball bowl and the oil cylinder, The pressure chamber is connected with a pressurized oil circuit and an overload overflow oil circuit, and the pressurized oil circuit and the overload overflow oil circuit are two different oil circuits; the pressurized oil circuit is connected with an overload pump. The invention adopts a pressure chamber between the ball bowl and the oil cylinder, the pressure chamber is connected with a pressurized oil circuit and an overload overflow oil circuit, and the pressurized oil circuit and the overload overflow oil circuit are two different oil circuits. The pressurization and overload overflow oil circuits are set separately to make the press stop instantaneously and quickly when overloaded. Compared with the traditional pressurization and pressure relief oil circuits, the same oil circuit structure is more sensitive and safer.

Description

technical field [0001] The invention relates to an overload protection device and method, in particular to an implosion-type overload protection device for a press. Background technique [0002] At present, the overload protection devices for mechanical presses on the market are mostly divided into two types, one is a crushing block type fuse device, and the other is a hydraulic overload protection device. The overload protection device during the working process of the press, that is, an unloading device when the working load exceeds 100%-110% of the rated load. At the same time, when the press is overloaded, the overload protection system can quickly restore the press to working state. In actual production, it is found that there are certain defects in the collapse block type fuse device and the hydraulic overload protection device. The crushed block type fuse is slightly overloaded, and the metal fuse does not necessarily rupture, and the machine tool can work normally w...

AI Technical Summary

Problems solved by technology

At the same time, when the press is overloaded, the overload protection system can quickly restore the press to the working state. In actual production, it is found that both the crushing block safety device and the hydraulic overload protection device have certain defects.

Slight overloading of the collapsed block type fuse will not necessarily break the metal fuse, and the machine tool can work normally without an alarm. With the press machine overloaded for a long time, the fatigue strength of the metal fuse increases, and the metal fuse deforms or even breaks. The theory In practice, the damaged fuse can be taken out from the square at the front end of the slider for replacement. In practice, it often happens that the fuse is deformed and stuck in the inner cavity of the slider and cannot be pulled out. It is necessary to disassemble the upper connecting rod and the slider, which will lead to maintenance time. Long, laborious, and affect the efficiency of equipment use

The hydraulic overload protection device used in medium and large mechanical presses often leaks during use and does not unload according to the nominal pressure, resulting in poor reliability and stability

The pressurized oil port and the unloaded oil port of the hydraulic overload protection device are the same port, and the response time is long when the overload occurs. In the process from the pressure overload to the stop signal of the press machine, the punch and the mold itself will be affected by the overload action reaction. Stress Injury Caused by Too Long

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