Ultra-high hydraulic lifting valve group for double-acting hydraulic oil cylinder

Abstract

The invention relates to a super high hydraulic lift group valve for a double-acting hydraulic cylinder. The lift group valve is characterized in that: the group valve consists of a pilot operated check valve and a one-way throttle valve, wherein the pilot operated check valve is arranged in a valve body; one end of the pilot operated check valve is connected with a rodless cavity oil port of a receiving cylinder, the other end is connected with one end of the one-way throttle valve, and the lower end is respectively connected with an oil inlet of a first valve and an oil inlet of a second valve; the other end of the one-way throttle valve is connected with the rodless cavity oil port of the receiving cylinder. The lift group valve has the advantages that the impact caused by valve closing due to pressure loss of a hydraulic control port of the pilot operated check valve can be effectively avoided .

Description

technical field [0001] The invention relates to an ultra-high hydraulic lifting valve group for a double-acting hydraulic oil cylinder, which belongs to the technical field of valves. Background technique [0002] With the improvement of manufacturing capacity in industry and construction, there are more and more large components ranging from hundreds of tons to thousands of tons. However, the lifting capacity of large cranes on land is generally about 100 tons to 600 tons. , so there is a problem of land lifting of large components. For large components that exceed the range of lifting capacity, manufacturers usually use ultra-high pressure hydraulic cylinders as lifting equipment for cost and feasibility considerations. [0003] As a lifting device, the ultra-high hydraulic cylinder has the advantages of scalable lifting capacity, flexible construction, and low total cost. It is precisely because of these advantages of the ultra-high pressure cylinder that its applicatio...

AI Technical Summary

Problems solved by technology

[0005] However, in occasions where heavy loads are required to descend, double-acting hydraulic cylinders equipped with hydraulic control check valves often experience "pause" and "shock" when descending, and the large components carried by the cylinder are formed due to the huge inertia. Impact, which is quite unfavorable to the component itself and the cylinder

The reason for the above phenomenon is that during the descent of the double-acting cylinder with load, the direction of the force generated by the oil entering the rod cavity of the cylinder on the piston is consistent with the load, and the force is opposite when it rises. When the hydraulic control check valve is opened, The movement of the piston of the oil cylinder is in an uncontrolled state and slides down rapidly. The speed of the oil entering the rod chamber cannot keep up and the phenomenon of "suction air" will cause the liquid control port to lose pressure and the one-way valve to close.

The hydraulic control check valve will not open again until the rod cavity is replenished with oil and the pressure of the hydraulic control port is re-established. If the above process is repeated continuously, there will be "pause" and "shock".

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