Two-position three-way quick response hydraulic valve

Abstract

The invention discloses a two-position three-way quick response hydraulic valve. The two-position three-way quick response hydraulic valve comprises a valve element, a valve body and a valve base; thevalve element is slidingly supported on the valve base and the valve body; the valve base is provided with a valve base sealing flange; the valve base slidingly supports the valve element through thevalve base sealing flange; the valve element is slidingly supported in a valve element slide hole of the valve body; an end surface circulating groove is formed in the upper end of the valve element;the pressed areas of two ends of the valve element are the same; a valve element piston part is arranged on the valve element, and is slidingly contacted with the valve body; the valve body, the valve element, the valve element piston part and the valve base surround an upper hydraulic cavity; the upper hydraulic cavity communicates with a valve base upper oil way on the valve base; the valve body, the valve element and the valve element piston part surround a lower hydraulic cavity; the lower hydraulic cavity communicates with a valve base lower oil way on the valve base; the valve body is provided with a valve body upper oil port and a valve body lower oil port; and a valve body end oil port is formed in the end part of the valve body. The hydraulic valve can effectively shorten the reversing response time to realize high-flow and high-frequency work.

Description

technical field [0001] The invention relates to a hydraulic reversing valve of a hydraulic transmission system, in particular to a direction control main valve used in a hydraulic transmission system of a hydraulic piling hammer. Background technique [0002] Pile machinery is the necessary equipment for penetrating piles into the ground to strengthen the bearing capacity of the foundation. With the enlargement of construction projects and the complexity of pile foundation engineering coefficients, the difficulty of pile foundation construction becomes more and more difficult, and the length of foundation piles And the diameter is also becoming larger and larger, which requires the pile driving machinery used to penetrate the foundation pile into the ground to have higher striking energy and higher striking frequency. [0003] Due to the characteristics of high piling efficiency, low noise, low vibration, and no oil smoke pollution, hydraulic piling hammer has been widely re...

AI Technical Summary

Problems solved by technology

However, there are still the following deficiencies in practical applications: First, the valve core is easy to form back pressure when it is reversing and moving, which directly affects the opening and closing response speed of the cartridge valve; when the valve core moves to the valve core hole on the control cover, Especially when the end surface of the valve core is close to the bottom surface of the valve core hole, the hydraulic oil between the two planes cannot be discharged smoothly in time, forming resistance and greatly slowing down the moving speed of the valve core, which not only makes the opening and closing response slow, but also forms The opening and closing of the valve body is unreliable; when the valve core moves against the direction of the valve core hole of the control cover plate, there is mutual adsorption force between the end surface of the valve core and the bottom surface of the valve core hole, and the hydraulic oil cannot be replenished in time between the two planes , will also delay the response speed of the spool

Second, in the structure of the valve, the return spring is used as a thrust supplement for the reset movement of the spool, or the spring force is used as the initial thrust of the spool movement, but when the spring is stretched to provide the thrust, since the spring is in the high-pressure hydraulic oil , the compression and stretching response of the spring is slow, and the elastic force is extremely limited, so relying on the elastic force to push is not reliable, nor can it provide enough driving force, nor can it effectively improve the response speed of the valve

Third, the cartridge valve fails to effectively control the pressure area at both ends of the valve core. Since the cartridge valve is in a high-pressure hydraulic environment when it works, the difference in the pressure area at both ends will form a large movement resistance of the valve core. Greatly hinders the spool movement response speed and movement speed

Fourth, the valve structure not only includes the control cover plate, valve core and valve sleeve, but also includes the valve core guide sleeve, which not only increases the number of parts, but also brings inconvenience to the manufacture and installation of the valve. Increase the sealing joint surface between parts, in the high-frequency and high-energy impact working environment of hydraulic piling hammer, it is easy to form leakage or cross-flow, which will affect the response speed of the valve core

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