Internal feedback type incremental hydraulic throttling digital valve

Abstract

The invention belongs to the field of hydraulic valves, in particular to an internal feedback type incremental hydraulic throttling digital valve, which comprises a hydraulic valve (1), a fixed frame (2), a mechanical transmission mechanism (4), a stepping motor (5) and a displacement sensing mechanism (3), wherein the hydraulic valve (1) and the stepping motor (5) are arranged on the fixed frame (2); the stepping motor (5) is connected with a valve core (14) of the hydraulic valve (1) through the mechanical transmission mechanism (4); and the valve core (14) and the fixed frame (2) are connected by screw threads. The digital valve of the invention is simple in structure, low in cost, strong in pollution resistance, high in reliability and low in leakage rate, meets requirements on a medium environment in a hydraulic system and can be directly controlled by digital signals sent by a computer and a single-chip machine without A / D and D / A conversion.

Description

technical field [0001] The invention belongs to the field of hydraulic valves, in particular to a water hydraulic throttling digital valve. Background technique [0002] Most of the current hydraulic valves use two kinds of media: water and hydraulic oil. In the environment that requires high-precision control, most of them are service valves that use hydraulic oil. Because the water medium is easy to corrode the valve core parts, in the hydraulic pressure of the existing structure Leakage is easy to occur in the valve, and the reduction of control accuracy cannot meet the requirements; however, the disadvantages of the service valve using hydraulic oil are also obvious. First of all, the service valve has very strict requirements on the cleanliness of the medium, and the manufacturing cost and maintenance cost are relatively high. The power consumption is also relatively large, which is difficult to be accepted by ordinary industrial users. Secondly, the hydraulic oil in th...

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Problems solved by technology

[0002] Most of the current hydraulic valves use two kinds of media: water and hydraulic oil. In the environment that requires high-precision control, most of them are service valves that use hydraulic oil. Because the water medium is easy to corrode the valve core parts, in the hydraulic pressure of the existing structure Leakage is easy to occur in the valve, and the reduction of control accuracy cannot meet the requirements; however, the disadvantages of the service valve using hydraulic oil are also obvious. First of all, the service valve has very strict requirements on the cleanliness of the medium, and the manufacturing cost and maintenance cost are relatively high. The power consumption is also relatively large, which is difficult to be accepted by ordinary industrial users. Secondly, the hydraulic oil in the service valve is easy to pollute the environment. Finally, the service valve is an analog proportional element and needs a hydraulic amplifier. A D / A converter must be added. When feedback is required, an A / D conversion must also be set to realize the interface with the computer, which is very inconvenient; therefore, an electro-hydraulic control system that can be controlled by the computer in real time is required, which can be directly connected to the computer. interface, digital valves that do not require a D / A converter

[0003] A stepper motor-driven fluid valve 20048001626505 is disclosed in the prior art. In this fluid valve, the problem of direct interface with the computer is solved through the control of the stepper motor. , this type of spool requires high working precision, once corrosion occurs, it will leak and cannot be adjusted by itself, so the working medium still needs to use hydraulic oil

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