A kind of hydraulic control pilot valve and bulldozer

Abstract

The invention relates to the technical field of hydraulic valves, and specifically discloses a hydraulic control pilot valve and a bulldozer. The hydraulic control pilot valve includes a valve seat, a first valve core, a second valve core, a first spring, a second spring and a joystick assembly , the joystick assembly is rotatably connected to the valve seat, the first valve core and the second valve core are both slidably set on the valve seat, when the joystick assembly is in the neutral position, the first valve core is driven by the first spring and hydraulic oil , The second spool acts on both ends of the joystick assembly under the drive of the second spring and hydraulic oil, and the position of the joystick assembly and the valve seat remains stable; when the joystick assembly is in the left position, the first spool Driven by the first spring, the second valve core acts on both ends of the joystick assembly under the drive of the second spring and hydraulic oil, and the position of the joystick assembly and the valve seat remains stable, which can realize the control of the joystick assembly. The clamping position has a simple structure and low cost, and there is no need to adopt an electromagnetic suction clamping structure and a mechanical friction clamping structure.

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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