End-control type internal expansion type mechanical locking hydraulic oil cylinder and operation method thereof

Abstract

The invention discloses an end-control type internal expansion type mechanical locking hydraulic oil cylinder and an operation method thereof. The oil cylinder comprises a cylinder barrel and a piston rod, and three blind oil passages which are independent from one another and provided with sealed tail portions are formed in the piston rod; three oil guide rods are arranged on a left end cover, and the three oil guide rods are arranged in corresponding blind oil passages respectively; a spiral pipe sleeve is limited and clamped between a left end cover piston and a right end cover piston; a spiral groove cavity is formed in the outer circumference of the spiral pipe sleeve; a first radial oil passage makes the spiral groove cavity communicated with the first oil guide rod, and a second radial oil passage makes the spiral groove cavity communicated with the second oil guide rod. Under the drive of only two inlet and outlet oil passages, early mechanical unlocking of the hydraulic oil cylinder and subsequent telescopic movements of a piston and the piston rod assembly can be achieved; mechanical self-locking of the hydraulic oil cylinder can be achieved under the condition that a driving oil passage is cut off, and the position locking precision can be guaranteed under the effect of long-term loading.

Description

technical field [0001] The invention relates to a hydraulic oil cylinder, in particular to an end-controlled internal expansion mechanical locking hydraulic oil cylinder and an operating method thereof. Background technique [0002] In hydraulic engineering equipment with gravity load or pressure-holding load, in order to ensure the position locking of the hydraulic cylinder under the long-term action of the load, the existing method is generally to install a hydraulic lock device in the hydraulic control circuit or install a mechanical friction in the cylinder. Locking device. When the hydraulic cylinder is locked by a hydraulic lock device, it is difficult to ensure the position locking accuracy of the hydraulic cylinder under long-term load due to leakage. When the mechanical friction locking device is used to realize the position locking, since it has nothing to do with the oil leakage of the locking force, the long-term load locking function of the oil cylinder can be ...

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Problems solved by technology

These three oil circuits need to be connected to the hydraulic power system through three external oil pipes in the friction self-locking cylinder. Therefore, compared with ordinary hydraulic cylinders, the number of oil ports of the internal expansion mechanical friction locking hydraulic cylinder increases, and there are needs during use. Retrofitting the hydraulic system, narrow installation space, complex pipeline layout, many oil leakage points, etc.

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