Bidirectional speed regulation hydraulic control system of oil return cavity based on hydraulic cylinder negative load

Abstract

The invention relates to a bidirectional speed regulation hydraulic control system of an oil return cavity based on a hydraulic cylinder negative load. The system is characterized by comprising a fueltank, a power pump, an oil source pressure setting valve set and a bidirectional speed regulation hydraulic control loop. According to the system, a speed regulation valve is used, so that the more energy-saving effect is achieved; balance of the negative load can be realized by the speed regulation valve and a balance valve, but if the balance valve is opened, at least hydraulic pressure of 2MPaneeds to be increased in a negative load cavity, and the balance valve is only used for supplementing oil to the negative cavity; and the number of valves for a loop is reduced, for the same system,if the balance valve is used, control on the speed can only be realized by adding the speed regulation valve in an oil inlet cavity, namely, the balance valve can only limit the force but not limit the speed, but the speed regulation valve has the functions of speed limiting and force limiting, only one bridge type bidirectional bottom plate is used, the structure of the system is simple, and thefailure rate is low.

Description

technical field [0001] The invention relates to the field of hydraulic control systems, in particular to a bidirectional speed-regulating hydraulic control system based on a negative load oil return chamber of a hydraulic cylinder. Background technique [0002] In hydraulically driven mechanical equipment, hydraulic cylinders are the main actuators. The negative load of the hydraulic cylinder means that the load of the mechanical equipment itself on the hydraulic cylinder can push the hydraulic cylinder to move without any hydraulic power. In this case, once the hydraulic circuit is opened, the action speed of the hydraulic cylinder will be out of control, which is a very dangerous state. [0003] The conventional technical solution to solve this problem is to add a balance valve to the chamber (designated as chamber B) opposite to the chamber where the hydraulic cylinder produces a negative load (designated as chamber A, which is the oil return chamber), and then open the ...

AI Technical Summary

Problems solved by technology

[0005] The technical problem to be solved by the present invention is to provide a two-way speed-regulating hydraulic control system based on the negative load oil return cavity of the hydraulic cylinder, which can solve the problem of controlling the speed of the hydraulic cylinder by using a balance valve under the negative load condition of the general hydraulic cylinder. The balance valve itself has the characteristics of speed control but not force control. When the speed is low, the hydraulic cylinder will climb.

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