Mechanical feedback plug-in mounting type proportional throttle valve system

Abstract

The invention relates to a mechanical feedback plug-in mounting type proportional throttle valve system, particularly to a system for realizing flow throttling during hydraulic rapid opening and safe and reliable closing processes. A hollow valve spool is arranged inside an axial hole of a valve bush, a top cover is sleeved at the large diameter end of the valve bush, a return spring is arranged between the top cover and the hollow valve spool, a control cover plate is sleeved at the upper end of a projection part in the middle of the top cover, a ratio electromagnet is connected with the upper end of a pilot operated servo valve, a servo-piston rod is arranged in the middle of the control cover plate, an internal valve bush is sleeved on the servo-piston rod and matched with the control cover plate, a feedback spring is connected with a spring base, the spring base is connected with the valve spool, a servo slide valve bush is sleeved on the valve spool and is provided with six radial oil ports, a transition plate is arranged on the side face of the valve, a reversal valve is arranged at the upper end of the transition plate, and a seal ring is arranged at the lower end of the transition plate. The proportional throttle valve system has simple structure, can be rapidly opened, and widely used in a hydraulic control system in machine tool industry, casting industry, compression casting industry, metallurgical industry, shipping industry, mining industry, etc.

Description

Technical field: [0001] The invention relates to a mechanical feedback plug-in proportional throttle valve system, in particular to a mechanical feedback plug-in proportional throttle valve system equipment for realizing flow throttling in the process of rapid hydraulic opening and safe and reliable closing. Background technique: [0002] At present, the hydraulic cartridge valve has a series of advantages such as simple structure, small flow resistance, small impact, large flow capacity, fast action, and less leakage. It has been widely used in machine tools, casting and forging, die-casting, metallurgy, ships, mines, etc. and other industries. The existing large-flow proportional throttle valve adopts the traditional mechanical structure, and the response speed is slow when it is opened under the condition of large flow; or the servo valve is used as the pilot stage for position closed-loop control, which has high investment costs, and at the same time, in some safety-rela...

AI Technical Summary

Problems solved by technology

The existing large-flow proportional throttle valve adopts a traditional mechanical structure, and the response speed is slow when it is opened under high-flow conditions; or the servo valve is used as the pilot stage to perform position closed-loop control, which requires high investment costs. When reliable closing is required, the existing valve has unreliable closing

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