Sandbox adopting variable-frequency motor vacuum pump

Abstract

The invention provides a sandbox adopting a variable-frequency motor vacuum pump. The sandbox comprises a sandbox body, gas bleed passages and the variable frequency motor vacuum pump. The sandbox body comprises a sandbox body inner wall and a sandbox body outer wall. A negative pressure chamber is formed between the sandbox body inner wall and the sandbox body outer wall. An upper part of the interior of the sandbox body is provided with a crossbeam. The gas bleed passages comprise a main gas bleed passage and auxiliary gas bleed passages. The main gas bleed passage is installed on the sandbox body inner wall. The auxiliary gas bleed passages are installed on the crossbeam of the sandbox body. The main gas bleed passage and the auxiliary gas bleed passages work simultaneously so that the negative pressure in the sandbox body is uniform. Through separated gas bleed, work load is reduced integrally and energy is saved. The variable frequency motor vacuum pump is used for gas bleed of the sandbox so that internal pressure of the sandbox can be adjusted automatically and various different demands are satisfied.

Description

technical field [0001] The invention relates to a casting auxiliary equipment, in particular to a sand box which uses a variable frequency motor to pump a vacuum pump. Background technique [0002] V-method casting is a green and environmentally friendly casting method. It is developing rapidly in China and its technology is becoming more and more mature. V method casting is the abbreviation of vacuum sealing molding or negative pressure molding casting process. Its principle is to use plastic film to cover the molding and seal the sand box, rely on the vacuum pump to draw out the air in the mold, and rely on the pressure difference between the inside and outside to make the sand particles compact and form the desired shape. A method of modeling a cavity. The advantage of using the V-method casting is that no binder is used for the molding sand, the shakeout is simple, the sand used for molding is reduced to a minimum, and most of the sand particles can be reused to save co...

AI Technical Summary

Problems solved by technology

[0003] At present, the V method is used to cast the castings and the sand box is used. Generally, air is pumped around the sand box, resulting in uneven negative pressure inside the sand box. The closer to the inner wall of the sand box, the greater the negative pressure, resulting in uneven overall density of the casting and affecting the quality of the casting. , while ordinary vacuum pumps use ordinary motors, which cannot control the pumping speed and cannot adapt to various requirements

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