Vacuum stop valve for mold

Abstract

The invention relates to the technical field of vacuum valves, in particular to a vacuum stop valve for a mold. The vacuum stop valve for the mold comprises valve bodies and a valve element. The valve body is provided with a buffer loop, an air inlet channel and an air outlet channel. The buffer loop communicates with the air inlet channel and the air outlet channel. The vacuum stop valve for the mold further comprises a piston. The end of the piston is arranged in the air outlet channel in a sleeved manner, and the piston and the fixed valve body move relatively. The piston is provided with an air channel. The valve element is movably inserted into the air channel and comprises an element bar and an element head. The element head is located at one end of the air outlet channel. A connecting channel is arranged between the air outlet channel and the air inlet channel. The front end of the element head is inserted into the connecting channel in a connected manner. The element head opens or closes the air channel by moving in the connecting channel. The vacuum stop valve for the mold is simple in structure, convenient to use, capable of smoothly discharging air in the mold, good in air discharge effect and high in safe reliability; and besides, automatic resetting can be achieved, and therefore production efficiency is improved.

Description

technical field [0001] The invention relates to the technical field of vacuum valves, in particular to a mold vacuum stop valve. Background technique [0002] The purpose of the die-casting machine is to manufacture the mold with copper, magnesium, zinc, aluminum and other metal liquids. In order to allow the air in the mold to be discharged smoothly, a vacuum valve must be equipped on the mold of the die-casting machine to cooperate with the vacuum compressor. Move, to discharge the air in the mold. The current mold vacuum valve is fixedly connected side by side with the pressure pin and the circuit breaker pin. When the pressure pin is pressed back, it drives the circuit breaker pin back synchronously to close the exhaust channel to form a circuit breaker. The process is that when the molten aluminum reaches the pressure pin, the impact pressure will push the pressure pin back and drive the breaker pin back, thereby preventing the aluminum water from entering. However, t...

AI Technical Summary

Problems solved by technology

However, the channel connecting the pressure pin and the circuit breaker pin is relatively short and straight, and its resistance is very small. The aluminum soup enters the valve core and rushes into the exhaust channel of the circuit breaker pin before pushing the pressure pin back, so that the circuit breaker pin cannot be reset normally, thus Unable to vacuum normally, causing the exhaust groove to be blocked or even stuck or damage the valve body. The blockage of the vacuum valve seriously affects the production mobility and frequent shutdowns, and also increases the defective rate of aluminum products

For example: a mold vacuum valve described in the Chinese utility model patent with application number 201020257912.4 is used as a switch for vacuuming the mold cavity. Pin, a support block fixedly connected with the root of the pressure pin and the circuit breaker pin, the rear side of the support block is provided with a compression spring for pushing the pressure pin and the circuit breaker pin forward, and the fixed valve body is set There are two through holes for the pressure pin and the circuit breaker pin to be inserted into, the circuit breaker pin is provided with an annular exhaust groove near the end, and the fixed valve body is provided with a valve communicating with the annular exhaust groove. exhaust hole, a pressurization channel connecting the two through holes is provided between the movable valve body and the fixed valve body, and the pressurization channel is formed by connecting a plurality of detours in series. The disadvantage is that when the pressure of the aluminum liquid on the pressure pin is less than the elastic force of the compression spring, the aluminum liquid will easily enter the annular exhaust groove of the circuit breaker pin, resulting in the blockage of the vacuum valve

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