Four-drive traveling control valve, open type hydraulic system equipped with same as well as traveling machine

Abstract

The invention discloses a four-drive traveling control valve, an open type hydraulic system equipped with the same as well as a traveling machine, and belongs to the technical field of aerial work platforms. Balance valves, a shuttle valve, flow distributing and collecting valves, a pressure reducing valve, a one-way throttle valve, check valves, a two-position three-way solenoid valve and damper valves are integrated in the traveling control valve. Besides adoption of an open type variable pump used for providing power for a traveling system, power can be provided for other actions such as rotary table slewing, arm support stretching and retracting, arm support amplitude variation and the like by increasing the number of plates of a proportional valve; the traveling control valve has high integration level, pipeline connection is covneint and simple, strong drive force is provided by motor drive, synchronous drive speed of four traveling motors can be realized, the requirement for performance of the aerial work platforms is met effectively, and a vehicle turns flexibly; the vehicle has good start and brake performance and is applicable to a downhill condition (a negative loading condition); and shift between fast gears and slow gears can be realized for the vehicle.

Description

technical field [0001] The invention relates to a four-wheel drive travel control valve, its hydraulic opening system and a travel machine, belonging to the technical field of aerial work platforms. Background technique [0002] With the rapid development of my country's infrastructure construction, the demand and inventory of construction machinery are also growing rapidly. The requirements are also getting higher and higher. [0003] Among many construction machinery, the walking system is one of its important components. Compared with the working system, the walking system not only needs to transmit greater power, but also requires higher efficiency and longer life. It has good capabilities in speed regulation, differential speed, changing the rotation direction of the output shaft and reverse transmission of power. [0004] There are mainly two types of walking systems for existing construction machinery: one is mechanical transmission, and the other is hydraulic transm...

AI Technical Summary

Problems solved by technology

[0006] The hydraulic closed walking system is applied on the aerial work platform. One closed oil pump can only complete the walking action, but cannot provide power for other actions (such as turning, luffing, telescopic, etc.) at the same time. To complete other actions, it is necessary to add other oil pumps. , so the cost is high

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