Multi-pump concurrent flow hydraulic system for crane and concurrent valve bank

Abstract

The invention discloses a concurrent valve bank which is provided with a first oil outlet, a second oil outlet, a first oil inlet, a second oil inlet and an oil return port, and the valve body of the concurrent valve bank is internally provided with a first control valve, a second control valve and a first reversing valve; the on and off of the first control valve and the second control valve arecontrolled through the switching of the working position of the first reversing valve, so that the oil liquid which enters from the first oil inlet and the second oil inlet can flow out of a second main oil port of the first control valve and the second control valve, and then enters the load which is communicated with the first oil outlet and the second oil outlet. Thus the oil liquid output from two hydraulic pumps concurrently flows to the same oil outlet by virtue of the concurrent flow bank; and because the concurrent flow quantity of the oil liquid is greater, a larger amount of load work can be satisfied simultaneously, the number of the hydraulic pumps in a hydraulic system is reduced, the manufacturing cost is lowered, and the hydraulic system is simplified. The invention also discloses a multi-pump concurrent flow hydraulic system for a crane.

Description

technical field [0001] The invention relates to the technical field of construction machinery, in particular to a multi-pump confluence valve group for a crane. The present invention also relates to a multi-pump confluence hydraulic system comprising the above confluence valve group. Background technique [0002] Hydraulic control technology is widely used in the field of construction machinery technology. Taking cranes as an example, the hydraulic system in cranes has become an important source of control power. [0003] At present, the oil pump in the hydraulic system of the medium-tonnage wheeled crane is usually placed under the car. The steering of getting off the car is usually controlled by two oil pumps, one is the normal oil supply pump and the other is the steering emergency pump; in addition, the oil-pneumatic suspension composed of accumulators and suspension cylinders with shock absorber functions is used to improve the ride comfort of the vehicle The system a...

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Problems solved by technology

[0004] The cost of the power source of the hydraulic system of the crane has a relatively large proportion in the cost of the whole crane. As mentioned above, in the prior art, the oil pump system for getting off the car needs to be equipped with five oil pumps in total, which is a large number. Obviously, the manufacturing cost of the corresponding main engine Second, the large number of oil pumps increases the difficulty of getting off the line design and complicates the installation process

[0005] Due to the limited pressure of the pressure oil provided by each oil pump, reducing the number of oil pumps while maintaining the independent work of each oil pump cannot guarantee that each working group can work normally, that is, it is impossible to reduce the number of oil pumps by directly connecting the working groups in parallel. ways to reduce costs

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