Rotary buffer valve

Abstract

The invention relates to a rotary buffer valve, comprising a valve body, a threaded sleeve, a buffer valve core, a buffer piston and a spring, wherein a first oil port and a second oil port are arranged in the valve body; the threaded sleeve is connected to the upper end of the valve body, and an oil returning port is arranged in the threaded sleeve; the buffer valve core can be slidingly arrangedin the valve body upwards and downwards to control the opening and closing of the first oil port and the second oil port; a jack, a through-flow hole and a damping hole are formed in the buffer piston; the buffer piston comprises a big-diameter section and a small-diameter section; the big-diameter section is in sliding fit with the jack; the small-diameter section is in sliding fit with an innerhole of the threaded sleeve; a buffer cavity and a spring cavity are formed; and the spring is arranged in the spring cavity. The rotary buffer valve provided by the invention has a simple and reasonable structure, low processing and manufacturing cost, convenient installation and better buffer effect.

Description

technical field [0001] The invention belongs to the technical field of hydraulic valves, in particular to a rotary buffer valve. Background technique [0002] In the slewing device of existing mechanical equipment, a large number of hydraulic circuits with buffer function are used, such as excavator slewing device, crane slewing device, aerial vehicle slewing device, manipulator slewing device and agricultural and forestry machinery slewing device, etc., among which the slewing buffer valve It is the key hydraulic component of this type of system, and the performance of the rotary buffer valve directly affects the performance of the main engine. The existing rotary buffer valves are divided into plate type rotary buffer valves and cartridge type rotary buffer valves according to the connection mode. In order to reduce the installation space and improve the system reliability in the system, the cartridge type rotary buffer valves are generally used. For example, the authoriz...

AI Technical Summary

Problems solved by technology

Although this invention can realize a simple buffer overflow function, its structure is relatively complicated, its volume is relatively large, its requirements are high in processing and assembly, and its overall cost is high; The pressure of the second oil port rises quickly to the first-stage pressure relief, and then the buffer piston compresses the spring to raise the pressure of the second port to the second-stage pressure, which is installed on the plug at the front end of the valve core for damping The orifice plays a role in controlling the buffer time when the first stage pressure is converted to the second stage pressure, but because of the damping hole and the long flow hole length inside the valve core, the response speed of the valve core is reduced, and the It is not ideal for applications on equipment that starts and stops frequently (such as small excavators)

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