Multi-level synchronous telescopic oil cylinder flow compensation device

Abstract

The invention relates to a multi-level synchronous telescopic oil cylinder flow compensation device. The multi-level synchronous telescopic oil cylinder flow compensation device comprises pairwise stroke triggering type two-position two-way valves (6 and 7) arranged on an oil cylinder piston (19) in the reverse directions. Valve elements (8) of the two-position two-way valves are arranged in inner channels (14) of the oil cylinder piston (19). The two-position two-way valves (6 and 7) move in an oil cylinder along with the piston. When the piston (19) is arranged at the middle portion of the oil cylinder stroke, stroke triggering switches of the pairwise two-position two-way valves (6 and 7) are not triggered, the two-position two-way valves are closed, and sealing is achieved. Oil channels (15) are formed in the inner channels of the oil cylinder piston, and when the stroke triggering switches of the two-position two-way valves are triggered, the inner channels (14) communicate with the oil channels (15). By means of the device, oil supplementing can conducted on a certain level of oil cylinder stretching out in place later when the oil cylinder stretches out, and oil releasing can be conducted on a certain level of oil cylinder retracting in place later when the oil cylinder retracts.

Description

technical field [0001] The invention relates to the technical field of hydraulic control valves, in particular to a multi-stage synchronous telescopic oil cylinder flow compensation device. Background technique [0002] Synchronous multi-stage telescopic cylinders are designed to ensure that the synchronous ratio (the synchronous ratio is the ratio of the area of ​​the outer ring of the anti-cavity of the previous piston to the area of ​​the positive cavity of the subsequent piston) is 1, but due to material specifications, processing technology and seals The two are often impossible to be equal, and there is a synchronization error, which makes it impossible to fully extend or recover the cylinders at all levels. If the actual synchronous ratio is less than 1, when the oil cylinder is fully extended when the previous stage oil cylinder is fully extended, the latter stage oil cylinder has not been fully extended, so it is necessary to install an oil replenishing device on th...

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Problems solved by technology

[0004] In view of the above analysis, the present invention aims to provide a multi-stage synchronous telescopic oil cylinder flow compensation device to solve the problem that the existing flow compensation device installs a check valve at the bottom of each oil cylinder piston, resulting in only the oil replenishment function, and the single Poor control of valve opening

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