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Closed type vacuum return stroke hydraulic oil cylinder used for casting

A hydraulic cylinder, closed technology, used in fluid pressure actuation devices, fluid pressure actuation system components, mechanical equipment, etc., to save production costs and prevent air from entering and leaving the piston reset cavity.

Inactive Publication Date: 2014-07-23
JIANGSU HUAWEI MACHINERY MFG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] In order to solve the defects and deficiencies of the existing known hydraulic cylinders for casting, the present invention provides a closed vacuum return hydraulic cylinder for casting, which can completely prevent the pollution and damage of hydraulic cylinders for casting by air dust particles.

Method used

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Embodiment Construction

[0006] Below in conjunction with example, the present invention is further described:

[0007] In the present invention, a countersunk nut cover with a sealing gasket is installed on the air inlet and outlet ports of the reset air cavity of the existing casting hydraulic cylinder, so as to isolate the air from entering the piston reset cavity, so that it becomes a closed vacuum for casting. Return hydraulic cylinder.

[0008] The specific installation is as follows: when installing the oil cylinder, first lift the piston to the top of the reset, and then tighten the countersunk nut with the gasket to make the air port of the piston reset chamber completely sealed.

[0009] The specific working example is: when the oil cylinder of the present invention is working, the piston pushes down, and the piston reset chamber begins to gradually increase with the downward movement of the piston. Since the piston reset chamber does not have air entering when it increases, a vacuum is ...

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Abstract

The invention relates to a closed type vacuum return stroke hydraulic oil cylinder used for casting, and belongs to hydraulic technology. According to the technical scheme, an air cleaner on an air inlet-outlet opening of an existing hydraulic oil cylinder used for casting is removed, and a sealed sinking hole nut cap is arranged on the air inlet-outlet opening. According to the action principle, firstly, when an oil cylinder is installed, a piston is raised to the top of the reset, and then the sinking hole nut cap with a sealing cushion is screwed on the oil cylinder to completely seal the inlet-outlet opening; when the oil cylinder works, the piston pushes downwards, and when a piston reset cavity begins to increase gradually along with the downward movement of the piston, vacuum forms in the piston reset cavity; the piston rises again after reaching the position, no air exists in the air cavity, so that the piston gradually sucks back to reset naturally, and the piston reset cavity is filled with the piston. The closed type vacuum return stroke hydraulic oil cylinder used for casting has the advantages that air going in and out of the piston reset cavity is eliminated, pollution to the piston of the oil cylinder and the cylinder wall by air dust particles is avoided, the service life of the oil cylinder is prolonged, the work performance of the oil cylinder is improved, the air cleaner is removed, and production cost is saved.

Description

technical field [0001] The invention relates to a closed-type vacuum return hydraulic oil cylinder for casting, which belongs to hydraulic technology. Background technique [0002] The known hydraulic oil cylinder for casting has the following defects: there is a piston reset cavity at the upper end of the upper piston of the oil cylinder for the piston to rise and reset. When the oil cylinder works, the piston pushes down, and the piston reset cavity gradually increases as the piston extends downward. And the air is sucked from the air port of the piston reset chamber. When the piston is in place and rises upwards, the piston reset chamber gradually becomes smaller and the air is discharged from the air port of the piston reset chamber. Due to the repeated suction and discharge of air in the piston reset chamber, the dust particles in the air contaminate the cylinder wall in the piston reset chamber. After the cylinder wall is polluted, the service life and working performa...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F15B15/14F15B15/20F15B21/04
Inventor 张连华
Owner JIANGSU HUAWEI MACHINERY MFG
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