Adjustable passive hydraulic oil cylinder

Abstract

The invention discloses an adjustable passive hydraulic oil cylinder which comprises a main body, a piston, a side pressing cavity, a buffer cavity, a side pressing oil path, a buffer oil path, a control oil path and an overflow adjusting device; and the overflow adjusting device comprises a valve core, a spring and a double-screw bolt which lean against one another successively, and the amount ofcompression of the spring can be adjusted by rotating the double-screw bolt. By implementing a side pressing process, the piston driven by a side pressing counteraction force moves upward, so that the oil pressure in the side pressing cavity is increased; when the elastic force of the spring is overcome by the oil pressure and the valve core moves, and the side pressing oil path is conducted, sothat oil in the side pressing cavity flows into the buffer cavity; and after side pressing, the piston moves downward to compress the buffer cavity, so that oil in the buffer cavity returns to the side pressing cavity through a buffer oil path. The oil pressure in the side pressing cavity conducts the side pressing oil path by overcoming the elastic potential energy of the spring, and the amount of compression of the spring is adjusted by rotating the double-screw bolt, so that the side pressing vigor can be controlled, and therefore, the service life of the device is prolonged.

Description

technical field [0001] The invention relates to the field of blank holders, and more specifically relates to an adjustable passive hydraulic oil cylinder. Background technique [0002] In the sheet metal stamping process, it is necessary to press the edge of the material to prevent the sheet from warping or wrinkling due to unbalanced force. [0003] As far as the prior art is concerned, the traditional blank-holding process needs to install an elastic blank-holding device in the mold to control the strength of the blank-holding device. Springs or air cushions are generally used for this type of blank-holding device. Such as metal springs, rubber springs or nitrogen gas springs, but in actual use, the compressible amount of the springs is limited and cannot be adjusted, and it is easy to fail when the force is too large, which affects the edge-holding effect. The air cushion uses high-pressure air as the elastic medium, and its initial pressure is high, but its service life...

AI Technical Summary

Problems solved by technology

Such as metal springs, rubber springs or nitrogen gas springs, but in actual use, the compressible amount of the springs is limited and cannot be adjusted, and it is easy to fail when the force is too large, which will affect the blanking effect

The air cushion uses high-pressure air as the elastic medium, and its initial pressure is high, but its service life is short, which is not convenient for wide application.

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