A proportional flow rotary valve for AC servo motor direct drive type unloading

Abstract

The invention discloses a proportional flow rotary valve for alternating-current servo motor direct valve type unloading. The proportional flow rotary valve comprises a servo motor, an output shaft of the servo motor is connected with a valve element of the rotary valve, the radial circumference of a valve sleeve of the rotary valve is evenly provided with two or more through holes, and the valve sleeve of the rotary valve is connected with an oil tank through a hydraulic pipeline. An oil inlet is formed in the axial direction of the valve element and is communicated with a stopper cavity of an action cylinder. Two or more through holes with the same diameter are evenly formed in the radial circumference of the valve element and serve as oil draining openings. The through holes of the valve sleeve correspond to the through holes of the valve element. Rotary joints are arranged outside the through holes of the valve sleeve, and the valve sleeve is fixed to a cylinder body of the action cylinder. The cylinder body is provided with two oil inlets, one of the oil inlets is communicated with a rod cavity of the action cylinder, and the other oil inlet is communicated with the stopper cavity of the action cylinder. According to the proportional flow rotary valve for alternating-current servo motor direct valve type unloading, fast oil draining control of two channels can be achieved, the servo motor is used for adjusting the speed to be matched with the reversing frequency or the mode switching frequency of the action cylinder, unloading flow is changed by adjusting the control signal of the servo motor, proportional flow control is achieved, the structure is simple, and machining is convenient.

Description

technical field [0001] The invention belongs to the technical field of rotary valves for hydraulic transmission control elements, and in particular relates to a proportional flow rotary valve for AC servo motor direct drive type unloading. Background technique [0002] Rotary valves are widely used in hydraulic systems, and the components of rotary valves are also developing towards standardization and modularization. It is most commonly used in stop valves and has better control over large flow adjustments. At present, two-stage or three-stage cartridge valves are used in high-pressure and large-flow places at home and abroad. The movement and control of the spool is realized by the pilot stage, which is combined with proportional control technology to form two-way and three-way proportional cartridge valves. Features The utility model has the advantages of simple structure, reliable performance, small flow resistance, large oil flow capacity and easy integration. However...

AI Technical Summary

Problems solved by technology

However, additional hydraulic circuits are required and the maintenance cost is high, and the technology of multi-stage cartridge valves in the domestic market is not yet mature

In particular, at present, many large-scale forging equipment in China use cartridge valves to achieve flow control, unloading and other functions. The working conditions of these forging equipment make the requirements for corresponding valves continue to increase. Failure to meet the requirements limits the development of domestic forging equipment in terms of tonnage and control accuracy

Although many domestic hydraulic valve manufacturers continue to carry out independent research and development, foreign imported plug-in unloading valves still account for the vast majority in the field of forging equipment, and the price is high, which increases the cost of equipment in disguise.

Images