Hydraulic control quick drop valve, hydraulic system and bulldozer

Abstract

The invention discloses a hydraulic control quick drop valve, a hydraulic system and a bulldozer and relates to the technical field of hydraulic element control. The hydraulic control quick drop valvecomprises a valve body and a first valve core. . The valve body is provided with an oil opening A1, an oil opening A, an oil opening B1, a first pilot oil cavity k and a second pilot oil cavity i. The second pilot oil cavity i communicates with the oil opening B1. The first pilot oil cavity k and the second pilot oil cavity i are located in the two ends of the first valve core correspondingly andcontrol the first valve core to reciprocate relative to the valve body. When the first valve core is located in the first limiting position, the oil opening A1 communicates with the oil opening A. When the first valve core is located in the second limiting position, the oil opening A1 communicates with the oil opening B1. According to the hydraulic control quick drop valve, the hydraulic system and the bulldozer, the problems that in the prior art, when a vacuumizing problem occurs to an oil cylinder and hydraulic oil in a rod cavity of the oil cylinder is supplied to a rodless cavity througha traditional quick drop valve, the oil supplement effect is poor, and energy loss is large are solved.

Description

technical field [0001] The invention relates to the technical field of hydraulic component control, in particular to a hydraulic-controlled quick-drop valve, a hydraulic system and a bulldozer. Background technique [0002] The quick-falling valve is a relatively unique valve in the working hydraulic system of bulldozers, which has not been used in other construction machinery products. Such as figure 1 and figure 2 As shown, the quick-falling valve is used in the lifting pipeline of the blade. The blade of the bulldozer accelerates down under the action of its own gravity acceleration, and at the same time drives the piston rod of the oil cylinder 1' to accelerate and extend. At this time, the main pump sucks oil from the oil tank to the oil cylinder. 1' The oil supply can no longer fill the rodless chamber 11' flow demand of the cylinder 1', and there is a phenomenon of air suction, which leads to obvious oil cylinder 1' when the blade falls to the ground and the handle...

AI Technical Summary

Problems solved by technology

[0009] The purpose of the present invention is to provide a hydraulic control quick-drop valve, a hydraulic system and a bulldozer, which are used to solve the problem of vacuum suction in the oil cylinder in the prior art, and use the traditional quick-drop valve to supply the hydraulic oil in the rod cavity of the oil cylinder to the rodless When the cavity is used, the oil replenishment effect is poor and the energy loss is large

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