Main valve and hydraulic control system thereof
A main spool and telescopic control technology, applied in the hydraulic field, can solve problems such as the inability to realize the hoisting function, a large number of pump sets, and high cost, and achieve the effects of rich functions, simplified pipeline layout, and small pressure loss
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[0028] The present invention will be further described below in conjunction with the accompanying drawings. The following examples are only used to illustrate the technical solution of the present invention more clearly, but not to limit the protection scope of the present invention.
[0029] Construction cranes mainly have four actions: luffing, telescopic, main hoisting, and auxiliary hoisting. Small-scale hoisting machinery mostly uses valve-controlled hydraulic systems, while large-scale hoisting machinery has a large flow rate in the system, and ordinary spool-type main valves cannot To meet the demand, the pump control system is often used, and four oil pumps are used to drive the four movements of the crane. The utilization rate of each oil pump is low, the weight of the pump unit is high, and the cost is high. Therefore, with the development of the industry, there is an urgent need for a cartridge-type main valve with logic control function, which can use two oil pumps...
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