A vacuum pumping valve for die-casting mold

Abstract

The invention discloses a vacuum extraction valve used on a die-casting die. The vacuum extraction valve comprises a moving valve body, a stationary valve body and a backboard, the stationary valve body is located between the moving valve body and the backboard, and an L-shaped exhaust duct is arranged on the upper portion of the moving valve body; a cavity provided with a feeding port is formed in the end face of the stationary valve body, a linkage mechanism used for controlling gas to enter and exit is arranged inside the stationary valve body, the linkage mechanism is matched with a pressure hole and an exhaust hole formed inside the cavity, and the exhaust duct corresponds to the upper end of the cavity; an ejection mechanism is arranged on the backboard, the front end of the ejection mechanism penetrates into the stationary valve body, and the linkage mechanism is located in the ejection mechanism. The vacuum extraction valve has the advantages of being ingenious in structural design and low in cost, the vacuum extraction valve enables the die-casting die to extract air smoothly in the production process, the fabrication process of the vacuum extraction valve is simple, and the maintenance cost is low.

Description

technical field [0001] The invention relates to a vacuum pumping valve, in particular to a vacuum pumping valve used on a die-casting mold. Background technique [0002] With the continuous development of die-casting technology, higher requirements are put forward for the mechanical properties of products, complex procedures, and the internal structure of castings. There is a lot of molten metal, which is more prone to air entrainment. Although there are exhaust settings in common die-casting molds, for die-casting parts with thicker walls, self-exhausting alone cannot fully discharge the gas in the cavity. On the existing die-casting mold, in order to be able to exhaust fully, a vacuum valve is provided on the die-casting mold, and the vacuum valve is basically controlled by a pneumatic piston. Air cut-off valve" utility model patent, which includes a dynamic valve body, a shaped cut-off valve body, the first and second piston rods, the first and second pistons and piston ...

AI Technical Summary

Problems solved by technology

Although such a vacuum die-casting shut-off valve can pump air into the mold cavity, it is difficult to ensure the roundness of the piston after the movable valve body and the shaped shut-off valve body are molded together, resulting in the failure to seal the water and the occurrence of pumping. If the air is not clean, the product will produce air holes; at the same time, the shut-off valve has high manufacturing precision and complicated maintenance

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