Lifting and steering hydraulic integrated valve with manual convenience

Abstract

The invention relates to a lifting and steering hydraulic integrated valve, which is convenient for manual control. The valve body is internally provided with the following branch valves consisting of valve core holes and valve rods: a steering slide valve, a lifting slide valve, a hydraulic control one-way valve, a high-pressure overflow valve and a low pressure overflow valve, wherein a plurality of process oil ducts are arranged between the branch valves and are communicated with each other. The lifting and steering hydraulic integrated valve is characterized in that the rod section of a valve core rod in a spring mounting cavity positioned in the valve core hole of the steering slide valve is provided with a pair of coaxial inner and outer ring double-spring seats, and the inner and outer ring double-spring seats are provided with an inner ring spring and an outer ring spring; and in an off working state, the inner ring spring is in a loosing state, while the outer ring spring is in a slight compression state to generate certain tensile force so that the valve core rod of the steering slide valve is in the middle position. The lifting and steering hydraulic integrated valve adopts a double-spring valve core rod control device in the steering slide valve, so that the controlling hand feeling of the steering slide valve is greatly strengthened, thus the operational efficiency and the safe reliability of the steering control of the lifting and steering hydraulic integrated valve is further improved.

Description

technical field [0001] The invention belongs to the technical field of hydraulic transmission control, in particular to an integrated hydraulic valve for controlling mechanical lifting and moving steering. Background technique [0002] General machinery with lifting and walking functions such as combine harvesters, its header lifting and complete machine steering control mechanism are all set separately, which takes up a large volume and is inconvenient to operate. For this reason, the applicant has designed a "single-handle control lifting and steering hydraulic integrated valve" (patent announcement number CN2622451Y), which is provided with 5 spool holes in the valve body, and the steering slide valve and the lifting slide valve are installed respectively. , the spool of the hydraulic control check valve and the high and low pressure relief valve, the process oil passage connecting each valve cavity is opened in the valve body, the hydraulic oil inlet connected with the o...

AI Technical Summary

Problems solved by technology

However, this valve still has disadvantages, that is, when controlling the displacement of the steering spool valve stem, due to the small feedback force, the operator feels poor, and it is difficult to control the steering range, especially for inexperienced operators, it is prone to improper control And make a sharp turn causing a safety accident

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