Hydraulic controlled pilot valve and bulldozer

Abstract

The invention relates to the technical field of hydraulic valves, and particularly discloses a hydraulic controlled pilot valve and a bulldozer. The hydraulic controlled pilot valve comprises a valveseat, a first valve element, a second valve element, a first spring, a second spring and an operating lever assembly, wherein the operating lever assembly is rotationally connected with the valve seat, and the first valve element and the second valve element are slidably arranged on the valve seat. When the operating lever assembly is located at the middle position, the first valve element is driven by the first spring and hydraulic oil and the second valve element is driven by the second spring and the hydraulic oil to act on the two ends of the operating lever assembly correspondingly, and the positions of the operating lever assembly and the valve seat are kept stable; and when the operating lever assembly is located at the left position, the first valve element is driven by the first spring and the second valve element is driven by the second spring and the hydraulic oil to act on the two ends of the operating lever assembly correspondingly, and the positions of the operating leverassembly and the valve seat are kept stable so that the position keeping of the operating lever assembly can be realized, the structure is simple, the cost is low, and an electromagnetic attraction position keeping structure and a mechanical friction position keeping structure do not need to be adopted.

Description

technical field [0001] The invention relates to the technical field of hydraulic valves, in particular to a hydraulic control pilot valve and a bulldozer. Background technique [0002] Bulldozers, loaders, excavators, cranes and other construction machinery are usually equipped with a manual hydraulic pilot valve to control the main control valve to control operations such as dropping the shovel. When the hydraulic pilot valve is in place, it needs to stop to lock the joystick. The location enables the construction machinery to continuously output power to reduce the fatigue intensity of the driver's operation. [0003] Whether the locking function of the hydraulic control pilot valve is reliable is very important to the safety of the whole machine and the comfort of operation. At present, the mainstream locking functions on the market include electromagnetic suction locking and mechanical friction locking. Electromagnetic suction card position, such as the manual decompre...

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to provide a hydraulically controlled pilot valve and a bulldozer to solve the structure of the electromagnetic suction clamping position in the related art, which requires complex circuit design and high cost; the mechanical friction clamping position requires the design of a mechanical friction structure. more complex issues

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