A load control type rotary valve

Abstract

The invention discloses a load control type rotary valve, and relates to the technical field of hydraulic control. An oil inlet of a proportional directional valve I communicates with an oil inlet P;an oil outlet of the proportional directional valve I communicates with a working oil port A; a control cavity at one end of a valve core of the proportional directional valve I communicates with a pilot control port A, and the other end of the valve core is connected with a piston cylinder I; an oil inlet of a proportional directional valve II communicates with the oil inlet P; an oil outlet of the proportional directional valve II communicates with a working oil port B; a control cavity at one end of a valve core of the proportional directional valve II communicates with a pilot control portB, and the other end of the valve core is connected with a piston cylinder II; the piston cylinder I is connected with the proportional directional valve II through a load control channel I; and thepiston cylinder II is connected with the proportional directional valve I through a load control channel II. According to the load control type rotary valve, the stroke of an oil return valve core iscontrolled by adopting the load pressure, namely the area of the oil return opening is controlled, and meanwhile, the opening degree of the oil return valve core is controlled by the oil return back pressure; the pressure balance in the rotary valve is achieved by adopting the load balance principle; and the oil return closing is slower than the oil inlet closing when the load control type rotaryvalve stops working, and the moment of inertia is consumed.

Description

technical field [0001] The invention relates to a hydraulic valve of a rotary mechanism, in particular to a load control type rotary valve. Background technique [0002] The truck crane or truck-mounted crane is equipped with a slewing mechanism. The slewing is all controlled by hydraulic pressure. The hydraulic pump is input to the slewing valve, and the output flow of the valve is sent to the slewing motor. The slewing motor drives the reducer to control the rotation of the turntable. Due to the heavy weight of the boarding mechanism and the large moment of inertia of the slewing, it is often unstable when starting and stopping the slewing, causing the whole vehicle to shake, which brings certain dangers to the hoisting operation. Most of the existing rotary valves use Tadano technology. This technology has not been improved, and it is not suitable for the current hydraulic system, and the start-stop impact is relatively large. It is imminent to upgrade the slewing techno...

AI Technical Summary

Problems solved by technology

[0005] 1. The two working oil ports are controlled by one spool. The opening areas of the two working oil ports are necessarily related. The areas of the working port A and the working port B are relatively fixed at each position, which cannot solve the inertia problem when starting and stopping the rotation. , which brings a certain degree of danger to the hoisting operation;

[0006] 2. There are many independent components, resulting in an increase in the volume of the valve body and high cost, which is not conducive to resource conservation and mechanism optimization

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