An Electric Proportional Load Sensing Multi-way Valve with Integrated Hydraulic Lock

Abstract

The invention discloses an electric proportional load sensitive multi-way valve of integrated hydraulic locks. The electric proportional load sensitive multi-way valve comprises working connections, wherein each working connection comprises a valve body, a main valve element, a pressure compensation valve element, two hydraulic locks and two piston rods, the two hydraulic locks correspondingly correspond to pressure opening of the two piston rods for each working combination, working oil ports A and working oil ports B are formed in the valve bodies, the working oil ports A communicate with aninth oil passage through the opened first hydraulic locks, the working oil ports B communicate with a fourth oil passage through the opened second hydraulic locks, and the main valve elements are provided with three position states including a middle position, a first position and a second position. According to the electric proportional load sensitive multi-way valve, the leakage risk is reducedin the working process, the working reliability of the multi-way valve is improved, and meanwhile, the matching requirements between the main valve elements and main valve holes are reduced; and through a pressure compensation function, the effect that the flow of each execution mechanism is distributed according to the needs is achieved, and the composite action of each execution action of a land leveler is realized, so that automatic control of the land leveler is realized, the control precision of a hydraulic system is improved, and an oil path of the hydraulic system is simplified.

Description

technical field [0001] The invention relates to the technical field of engineering machinery hydraulics, in particular to the field of electric proportional load-sensitive multi-way valves for graders. Background technique [0002] The grader is the main machine used for shaping and leveling operations in earthworks. At present, the hydraulic system of the actuator of the grader is mostly in the form of gear pump + manual switch valve, and there is also the form of plunger pump + manual load-sensitive multi-way valve. The pump and the manual reversing valve are the main ones, and the actuators are controlled by the operating handle. The flow rate of the working device is determined by the flow rate of the pump. When the flow demand is small, it still outputs enough flow, resulting in a certain power loss. With the development of technology, high technology represented by modern microelectronics technology is becoming more and more widely used to transform the traditional str...

AI Technical Summary

Problems solved by technology

[0005] At present, when the flow demand is small, the manual throttling multi-way valve used by existing domestic motor graders still outputs enough flow to cause a certain power loss. At the same time, a large amount of hydraulic oil circulates in the pipeline, reducing the use of life

In addition, the operation of the motor grader requires continuous operation of multiple handles to control the machine according to the actual working conditions, which requires a high level of experience for the operator. At the same time, the labor intensity is high. At the same time, the accuracy of the motor grader cannot be further improved, and the construction efficiency is low.

Load-sensing hydraulic technology can self-adaptively adjust working characteristics according to the feedback of load pressure or flow signal changes. However, if the existing load-sensing multi-way valve is directly selected, multiple external hydraulic locks need to be installed in the hydraulic pipeline, and there are many leakage points. Complicated pipeline layout and high cost

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