Vacuum stop valve and hydraulic drive device and vacuumizing device formed by vacuum stop valve and hydraulic drive device

Abstract

The invention discloses a vacuum stop valve and a hydraulic drive device and a vacuumizing device formed by the vacuum stop valve and the hydraulic drive device. The stop valve comprises a valve body and a valve core. The hydraulic drive device comprises a hydraulic cylinder, a three-position four-way magnetic valve, an energy storage device, a two-position two-way magnetic valve, a one-way valve and a hydraulic control device. The vacuumizing device comprises the vacuum stop valve and the hydraulic drive device. A single valve core type is adopted in the vacuum stop valve, and therefore structure is simple, disassembly is convenient, abrasion can not happen easily, maintenance work amount in later stages is reduced greatly, and use cost is reduced. By adopting hydraulic drive, drive force is large, and motion reliability of the valve core is improved. By adopting a hydraulic high-speed drive circuit, the problem that hydraulic transmission is slow in response speed is solved, response speed of the vacuum stop valve is improved, quick closing is achieved, and blockage due to the fact that molten metal enters into the valve body is effectively prevented.

Description

technical field [0001] The invention belongs to the technical field of casting, and in particular relates to a vacuum cut-off valve, a hydraulic drive device and a vacuum pumping device formed thereof, which are used for high vacuum pressure casting. technical background [0002] In recent years, with the vigorous development of the automobile industry and the industry's urgent pursuit of automobile lightweight, replacing steel with aluminum has become the preferred method for most automobile manufacturers. Die casting has the advantages of high dimensional accuracy, low surface roughness, and high material utilization, and is more and more widely used in the field of automobile manufacturing. Due to die casting, the melt quickly fills the mold cavity under high pressure and high speed, so that the gas in the cavity cannot be discharged in time, so it stays in the casting and forms defects such as pores. Due to the existence of pores in castings, it is difficult to further ...

AI Technical Summary

Problems solved by technology

This passive mechanical vacuum shut-off valve has the following disadvantages in use: 1) the workload of maintenance is very large

2) Strict working procedures must be implemented, especially in the hot mold and debugging stages, because the flow inertia impact force of the molten metal is insufficient at this time, and it is difficult to close the stop valve spool in time, which may cause blockage of the vacuum stop valve channel, not only Increase the cost of later maintenance, and seriously affect the work efficiency

3) The spool has high processing precision, is not wear-resistant, is prone to failure, and increases the cost of use

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