a hydraulic valve

Abstract

The invention relates to a hydraulic valve which is characterized by comprising a valve block, and a first channel and a second channel, wherein an oil inlet, an oil return port, a first working oil port, a second working oil port, a third working oil port and a fourth working oil port are formed in the valve block; a first reversing valve element, a second reversing valve element and a control plunger are slidably arranged in the first channel and the second channel, separately; a first master control cavity, a first slave control cavity, an oil return cavity and a second slave control cavityare formed in two sides of the first reversing valve element and the second reversing valve element, a first spring and a second spring are separately arranged in the first master control cavity andthe first slave control cavity, and a third spring is arranged in the oil return cavity; a second master control cavity is formed in one side of the control plunger, and an overflow valve which controls the second reversing valve element to move rightward and a one-way overflow valve communicating to the second working oil port and the fourth working oil port are also arranged on the valve block.The hydraulic valve provided by the invention not only is simple in structure and low in cost, but also can control a double cylinder hydraulic overturn plow automatically, and is high in degree of automation.

Description

technical field [0001] The invention belongs to the technical field of valves, in particular to a hydraulic valve. Background technique [0002] In recent years, most areas of my country have begun to promote the application of hydraulic turning plows. Using the reversing plow for plowing has the advantages of no opening and closing ridges, high production efficiency, and energy saving. The hydraulic reversing plow uses the hydraulic system of the tractor to control the left and right plow bodies to operate alternately, so as to achieve the purpose of no opening and closing ridges. [0003] At present, the control mode of single oil cylinder is generally adopted for small turning plows, while the control mode of double oil cylinders is adopted for large turning plows. The hydraulic tilting plow controlled by double cylinders mainly includes a lifting cylinder and a turning cylinder. The two cylinders are controlled by the hydraulic system of the tractor. When the plow is i...

AI Technical Summary

Problems solved by technology

The manual control type is that the tractor driver directly manipulates the manual slide valve to control the oil circuit of the lifting cylinder to lift the two-way plow first, and then manipulates the manual slide valve to change direction to control the flip cylinder to start flipping, and the plow moves the fork in the middle position to drive a The rotary valve converts the oil circuit of the oil cylinder to complete the turning and turning, and then manually manipulates the slide valve to control the extension of the lifting cylinder. When the turning control valve is turning, the tractor driver also controls the steering wheel and lifting the plow. The overturn control valve is very tense and busy to complete these actions in a short time, and the labor intensity increases; at the same time, three control slide valves (one slide valve for lifting cylinder control, one slide valve for overturn control) are required. 2 spool valves) not only complex structure, but also high cost

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