Unloading valve, combination valve comprising unloading valve and combination valve type buffer oil cylinder

Abstract

The invention relates to the field of hydraulic oil cylinders, in particular to an unloading valve, a combination valve comprising the unloading valve and a combination valve type buffer oil cylinder.The unloading valve comprises a valve body, a valve element and a return spring. The valve element is further provided with a damping hole and an unloading groove. The combination valve comprises theunloading valve and a throttling valve. The throttling valve comprises a buffer plug and a buffer cavity. A piston rod assembly of the combination valve type buffer oil cylinder is installed in a cylinder body. The cylinder body comprises a cylinder head flange, a cylinder bottom and a cylinder barrel. The piston rod assembly comprises a guide sleeve, a piston and a piston rod. The combination valve is arranged on the guide sleeve and / or the cylinder bottom. According to the unloading valve, the combination valve comprising the unloading valve and the combination valve type buffer oil cylinder disclosed by the technical scheme, the unloading function of an oil inlet cavity is added, the buffer effect is outstanding, and the buffer pressure is reduced; and meanwhile, a system is in an unloading state in a buffer stage, energy losses and the heating of the system are reduced, pressure impact caused by buffer on the system is avoided, the reliability of the system is improved, and the difficulty of performance matching and installing and debugging of an original buffer valve is lowered.

Description

technical field [0001] The invention relates to the field of hydraulic oil cylinders and hydraulic valves, in particular to an unloading valve, a combined valve including the unloading valve, and a combined valve type buffer oil cylinder. Background technique [0002] The hydraulic cylinder is the key executive component of the hydraulic system of construction machinery, which provides power for the working mechanism of construction machinery and completes various operation cycles, such as shoveling operations of loaders and excavation operations of excavators. The oil cylinders of construction machinery are generally medium and high pressure heavy-duty oil cylinders. The working pressure is relatively high, and the inertia of the reciprocating parts of the oil cylinder is also relatively large. Oil, cylinder head falling off, cylinder bottom cracking, piston loosening and other failures occur, and at the same time, it also brings a large hydraulic shock, causing hydraulic s...

AI Technical Summary

Problems solved by technology

[0005] The main purpose of the present invention is to provide an unloading valve, a combination valve including the unloading valve, and a combined valve type buffer oil cylinder, so as to solve the problem of the large mechanical collision impact caused by the piston movement of the hydraulic cylinder in the prior art, resulting in oil leakage from the oil cylinder. , Cylinder head falling off, cylinder bottom cracking, piston loosening and other faults occur, and at the same time it also brings a large hydraulic shock, causing hydraulic system failure, and at the same time, it is difficult to control the throttle port, low cushioning quality, high power consumption and energy waste, etc. At the same time, the optimized design simplifies the structure, reduces the difficulty of manufacturing, and can also adopt a small-diameter spool design to improve the performance of the valve.

Images