Composite oil cylinder

Abstract

The invention discloses a composite oil cylinder, which comprises a main cylinder assembly and a secondary cylinder assembly, wherein the main cylinder assembly comprises a main cylinder body, a main piston rod and a main piston arranged in the main cylinder body, and a main cylinder rear cover assembly arranged at the tail part of the main cylinder body; the main piston divides the cavity of themain cylinder body into a main cylinder pressing cavity and a main cylinder return cavity; the main cylinder body is provided with an oil inlet part for communicating the main cylinder pressing cavity and an oil tank and an oil outlet part for communicating the main cylinder return cavity and the oil tank; a main rod cavity with one open end is formed in the main piston rod; the secondary cylinder assembly comprises a secondary piston rod passing through the main rod cavity, a secondary piston arranged at the inner end of the secondary piston rod and used for dividing the main rod cavity intoa secondary cylinder pressing cavity and a secondary cylinder turn cavity, an oil inlet structure for communicating the secondary cylinder pressing cavity and the oil tank, and an oil outlet structure for communicating the secondary cylinder return cavity and the oil tank; the outer end of the secondary piston rod is fixed on the main cylinder rear cover assembly; and an oil seal assembly linked with the main piston rod is arranged between the open end wall of the main rod cavity and the outer wall of the secondary piston rod and used for closing the secondary cylinder return cavity.

Description

technical field

[0001] The invention belongs to a power executive component on hydraulic equipment, in particular to a compound oil cylinder. Background technique

[0002] The fast forward, fast reverse, working speed, buffering and other actions of the slider on most hydraulic machines are realized by external hydraulic control to drive the oil cylinder, but the traditional oil cylinder structure is difficult to achieve the above functions. The existing solution is to assist the work of the main oil cylinder through the external oil cylinder or the internal oil cylinder. The external oil cylinder has the disadvantages of large volume and complex structure of the hydraulic machine, and the internal oil cylinder mainly has the disadvantages of large single cylinder length and complicated manufacturing process. . For example, the State Intellectual Property Office of China published the patent No. "200320110440.X" on 2004-12-29, and the patent named "Composite Hydraulic Cylin...

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