Double-valve-core rotary type direction throttle valve driven by two motors

Abstract

The invention discloses a double-valve-core rotary type direction throttle valve driven by two motors. The double-valve-core rotary type direction throttle valve comprises a valve body, a valve core AB and a valve core PT, wherein the valve core AB and the valve core PT are assembled in the valve body. Opposite inner end faces of the valve core AB and the valve core PT are sealed. A feedback input shaft connected with a feedback motor is arranged at the outer end of the valve core AB, and a control input shaft connected with a drive motor is arranged at the outer end of the valve core PT. An annular groove C is formed in the inner end face of the valve core AB, wherein an orifice sealing pin of an oil hole P and an orifice sealing pin of an oil hole T are arranged in the annular groove C, the orifice sealing pins separate the annular groove C into corresponding independent sections, and an orifice of an oil hole A and an orifice of an oil hole B are respectively arranged in two adjacent independent sections. The double-valve-core rotary type direction throttle valve driven by the two motors is symmetric and stable in structure, and the valve cores and the valve body are uniform in stress. The two valve cores are both directly driven by the drive motor to rotate, and therefore an unknown dead zone and zero drifting are avoided; and by utilizing the rotation of the two valve cores in the same direction, position feedback can be formed easily, and control accuracy is improved.

Description

technical field [0001] The invention belongs to the field of fluid transmission and control, and in particular relates to a double-spool rotary directional throttle valve driven by double motors. Background technique [0002] The electro-hydraulic proportional valve is cheap, energy-saving, has low requirements on oil cleanliness, and has a simple structure. However, in the prior art, the control accuracy of the proportional valve is low; the electro-hydraulic servo valve has small dead zone, small hysteresis, high frequency response, and high control accuracy, but the structure is complex, the manufacturing cost is high, and the use is complicated. The motor-driven hydraulic valve can be directly controlled by the pulse signal without D / A conversion, and it is easy to realize digital quantitative control. [0003] The existing motor-driven directional throttle valves are slide valve spools, and the coupling interface with the drive motor is usually through a screw or a cam...

AI Technical Summary

Problems solved by technology

[0003] The existing motor-driven directional throttle valves are slide valve spools, and the coupling interface with the drive motor is usually through a screw or a cam. The interface mechanism will wear due to friction, resulting in unknown dead zone and zero drift. The accuracy is reduced; although there are also motor-driven rotary spools, they are all driven by a single motor

Invention patent 200510082720.8 discloses a "shaftless rotary digital directional flow valve". This valve is also composed of two spools, the active and the driven, but the outer circumference of the spool is provided with teeth, and through the gear Coupled with the drive motor, it avoids some disadvantages of the slide valve, but it is necessary to process the teeth on the outer circumference of the valve core, which increases the difficulty of processing and the structure is more complicated; the coupling between the gear and the motor also makes the structure of the valve complex and the control accuracy reduce

The utility model patent document CN88200510U discloses a "rotary hydraulic servo valve". Although this valve has two spools that can rotate relative to each other, only one spool is directly driven by a motor to rotate, and the two spools are asymmetrical. There are three oil holes on one side of the spool, and only one oil return hole on the other side of the spool, so the force on the two spools is uneven, and the oil return hole is made on the end cover, so that the end cover is subjected to hydraulic pressure role, structural instability

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