Bidirectional secondary pressure rotary cushion valve

Abstract

The invention discloses a bidirectional secondary pressure rotary cushion valve. The bidirectional secondary pressure rotary cushion valve comprises a valve body, a main valve core, a valve sleeve, adamper piston, a first pilot valve core, a second pilot valve core, a second elastic part and a third elastic part, wherein the valve body is provided with an oil opening A, an oil opening B and an oil opening T; the main valve core is connected inside the valve body; the valve sleeve is connected with the valve body and forms a first control chamber and a second control chamber with the main valve core; a first elastic part is arranged between the main valve core and the valve sleeve; the damper piston is provided with a shuttle valve component, a first oil charging passage, a second oil charging passage and an oil discharging passage, wherein the first oil charging passage, the second oil charging passage and the oil discharging passage communicates with the shuttle valve component; oneend of the first pilot valve core leans against a first valve sleeve opening; one end of the second pilot valve core leans against a second valve sleeve opening; the second elastic part leans againsta position between the first pilot valve core and the damper piston; and the third elastic part leans against a position between the second pilot valve core and the damper piston. The bidirectional secondary pressure rotary cushion valve disclosed by the invention is small in impact, simpler and more impact in structure, more convenient to machine and lower in cost.

Description

technical field [0001] The invention relates to the technical field of valves, in particular to a two-way two-stage pressure rotary buffer valve, which is mainly used in rotary mechanisms of small cranes, small excavators, high-altitude operating vehicles and other mechanical equipment. Background technique [0002] In order to improve the work efficiency and the mobility of the whole machine in construction machinery, there is generally a slewing mechanism. For truck cranes, the slewing mechanism is even more indispensable. However, the truck crane has a large load inertia during slewing, frequent starting and braking, and harsh working conditions. Therefore, its hydraulic system requires reliable operation, especially when the slewing is starting and braking, there should be no large pressure shock. [0003] The prior art generally prevents overload by setting a rotary buffer valve. At present, there are two main types of slewing buffer valves for small and medium tonnag...

AI Technical Summary

Problems solved by technology

However, the above two rotary buffer valves are composed of multiple valve parts, which are relatively bulky and costly, and are not suitable for widespread use on small cranes.

[0004] In addition, most of the existing rotary cushioning valves are first-level cushioning, and the impact pressure is generally large and not soft.

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