Multi-stage oil cylinder and hydraulic device with same

Abstract

The invention provides a multi-stage oil cylinder and a hydraulic device with the same. The multi-stage oil cylinder comprises a primary cylinder barrel (1), a final-grade cylinder barrel (7) sleeved in the primary cylinder barrel (1) and single-stage or multi-stage middle cylinder barrels (6) sleeved between the primary cylinder barrel (1) and the final-stage cylinder barrel (7) in turn, wherein the cylinder barrels (7) of all stages except the primary cylinder barrel (1) all comprise cylinder barrel parts (61, 71) and piston parts (62, 72) arranged at inner side ends of the cylinder barrel parts (61, 71); a rodless cavity of the primary cylinder barrel (1) is communicated with a rodless cavity oil duct (15) communicated with the outside; a rod cavity of the middle cylinder barrel (6) of a previous stage of the final-stage cylinder (7) is communicated with a rod cavity oil duct (13) communicated with the outside; and a side oil duct (4) is formed on a barrel wall of the middle cylinder barrel (6) and communicated with the rodless cavity of the middle cylinder barrel (6) and the rod cavity of the previous-stage cylinder barrel (1). The multi-stage oil cylinder and the hydraulic device with the same have the advantages of simple structure, convenient processing and capability of bearing heavier work load.

Description

technical field [0001] The invention relates to a fluid pressure mechanism, more specifically, to a multi-stage oil cylinder and hydraulic equipment with the same. Background technique [0002] There are two forms of multi-stage oil cylinders: single-acting multi-stage oil cylinder and double-acting multi-stage oil cylinder. The internal oil passage of single-acting multi-stage oil cylinder is relatively simple. Generally, there is only one oil inlet, which also serves as the oil return port. It needs external force when retracting. In the double-acting multi-stage oil cylinder, there are oil inlet and outlet ports on each stage oil cylinder, and each oil port communicates with the outside through the outer oil pipe. The external oil pipe moves frequently, and it is easy to get caught and rubbed with other parts. There are defects such as easy aging and cracking of the oil pipe, and easy leakage of hydraulic oil. [0003] In order to solve the above problems, Chinese utili...

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Problems solved by technology

[0004] However, this kind of multi-stage cylinder involves the processing of the longitudinal oil pipe on the cylinder wall itself, and the structure is relatively complicated.

Moreover, this kind of multi-stage cylinder shares a rodless chamber. Therefore, under the same hydraulic pressure, the area of ​​the rodless chamber corresponding to the pistons of the cylinders of each stage is small, resulting in relatively small hydraulic thrust that can be distributed to the pistons of each stage.

Therefore, it is difficult for this multi-stage hydraulic cylinder to bear a large working load

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