Circular-buffering flow control hydraulic valve

Abstract

The invention discloses a circular-buffering flow control hydraulic valve. The circular-buffering flow control hydraulic valve comprises a handle, a pressure reduction valve bank, a handle spring connecting rod, a main valve body, a rear valve deck, an electromagnetic coil, a main valve element spring, a main valve element, a circulating loop valve element, a front valve deck, a balanced oil drainvalve, a response buffer valve, an impact unloading valve, a damper, a buffering energy-accumulation auxiliary port, and special-shaped oil paths. By adoption of the circular-buffering flow control hydraulic valve, the problem that reverse rotating hydraulic impact and inertia rotation generated by a rotary load execution element, used for providing power, of a hydraulic system result in vacuum air intake of a hydraulic element pipeline after the hydraulic system is stopped is solved. According to the circular-buffering flow control hydraulic valve, a novel flow control method for cyclicallydecelerating hydraulic oil in the pipeline slowly and gradually to buffer instant impact generated by the system after power or a hydraulic source provided for the hydraulic system is cut off is provided.

Description

technical field [0001] The invention belongs to the field of hydraulic system control, and in particular relates to a circulating buffer flow control hydraulic valve. Background technique [0002] When the high-speed rotating actuator stops, it will generate a large moment of inertia due to its own inertia. For the working conditions of precise control or timely shutdown, it is necessary to increase the external brake to control the rotation, but for the rotating actuator to stop, it does not need to stop immediately or need to When the speed stops slowly, the system control generally adopts the method of stopping the power output of the driving element, and the rotating actuator is allowed to rotate by inertia until the mechanical friction stops. This kind of hydraulic system is very common in equipment that drives high-speed, high-torque loads with hydraulic motors and does not require immediate shutdown, such as hydraulic motors driving fan blades to rotate. [0003] In ...

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Problems solved by technology

[0003] In the above-mentioned control mode, in the hydraulic open system, when the hydraulic pump is stopped or the oil supply is cut off, the load rotates and the inertial rotation is allowed, and the hydraulic motor is passively rotated due to inertia to discharge the oil inlet pipeline of the hydraulic motor, resulting in partial pipeline failure. Vacuum, especially when the load rotating element is arranged at a high position, it is easier to generate a vacuum inside the hydraulic motor or enter the air, so that the hydraulic motor is willing to rub against the pneumatic every time it is turned on without hydraulic oil lubrication, which seriously affects the life; while in the hydraulic closed system , when the hydraulic pump is stopped or the oil supply is cut off, the rotational inertia of the load will cause the hydraulic oil at the outlet of the hydraulic motor to close and accumulate, and the pressure will rise sharply, resulting in a reverse drive of the hydraulic motor, and the load will reverse. Shutdown, reverse effect, high pressure impact damages hydraulic components, and reduces pipeline life

[0004] In view of the above problems, it is necessary to realize the slow stop of the load inertial rotation to reduce mechanical friction, and to solve the technical problems of shock and vacuum non-lubricated start in the hydraulic system due to reverse rotation. A circular buffer flow control hydraulic valve is proposed. Through the control valve and The flow and pressure of the hydraulic oil between the hydraulic motors are designed to realize the active circulation of the flow during the hydraulic reversing cut-off or shutdown process of the hydraulic system, which is controlled by slowing down the rotation speed through the flow resistance of the hydraulic oil, and through the working oil circuit and the return oil. A bypass buffer hydraulic combination device is set between the roads to reduce the reverse impact and replenish the oil in the pipeline

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