Implosion type overload protection device and method for press machine

Abstract

The invention discloses an implosion type overload protection device and method for press machine. The device comprises a ball head for the press machine, the ball head is connected with a ball bowl in a matched mode, and the ball bowl is connected with an oil cylinder in a matched mode; a pressure cavity is formed between the ball bowl and the oil cylinder and connected with a pressurization oil way and an overload overflow oil way, and the pressurization oil way and the overload overflow oil way are two different oil ways; and the pressurizing oil way is connected with an overload pump. The pressure cavity is formed between the ball bowl and the oil cylinder, the pressure cavity is connected with the pressurization oil way and the overload overflow oil way, and the pressurization oil way and the overload overflow oil way are two different oil ways; the pressurization oil way and the overload overflow oil way are arranged separately, so that the press machine stops instantly and rapidly during overload, and the reaction is more sensitive and safer compared with a traditional pressurization oil way and a traditional pressure relief oil way which are of the same oil way structure.

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, most of the overload protection devices for mechanical presses on the market are divided into two types, one is a collapse block type safety device, and the other is a hydraulic overload protection device. The overload protection device during the working process of the press is an unloading device when the load exceeds 100%-110% of the rated load during operation. 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 crushed 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 witho...

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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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