A numerical control rotary core proportional cartridge valve

Abstract

The invention relates to a numerical-control spinning-core type proportional cartridge valve. The numerical-control spinning-core type proportional cartridge valve comprises a servo motor, a supporting base, a control cover plate, a spinning core, a piston, a cartridge valve sleeve and a cartridge valve element, wherein the cartridge valve element is arranged in the cartridge valve sleeve; an oil-return oil path and a pressure-oil oil path are arranged on the control cover plate; an inner cavity is arranged on the piston; the lower end of the spinning core is arranged in the inner cavity; the upper end of the spinning core extends into the supporting base and is connected to the output shaft of the servo motor; a first auxiliary oil path is arranged on the piston; a second auxiliary oil path is arranged on the piston; a plurality of groups of cylindrical bulges are arranged on the spinning core; and a working oil path is arranged among each group of cylindrical bugles. The numerical-control spinning-core type proportional cartridge valve has the beneficial effect that electrical-mechanical conversion is carried out with the adoption of the servo motor. Compared with a current proportional electromagnet, the linearity degree of the servo motor is good, the linear range is unlimited, and high-precision ring-opening preparation control is conveniently realized with the adoption of a digital technology. The numerical-control spinning-core type proportional cartridge valve is simple in structure, is flexible to control, is convenient to use, and is high in reliability.

Description

technical field [0001] The invention relates to a numerically controlled rotary core proportional cartridge valve. Background technique [0002] There is an existing utility model patent 1, the patent number of which is CN201220158057.0. The utility model discloses a cartridge valve structure with an electronic induction switch, including a cartridge valve, a solenoid valve communicated with the cartridge valve and fixed together, and The electronic sensor fixed on the cartridge valve, oil circuit A and oil circuit B are opened on the cover plate of the cartridge valve, the oil circuit A connects the solenoid valve with the top of the cylinder of the cartridge valve, and the oil circuit B connects the solenoid valve It communicates with the bottom of the cartridge valve oil cylinder, and the electronic sensor is fixed on the cartridge valve cover plate and senses the movement of the piston through the sensing area at its top. [0003] There is a utility model patent 2, the ...

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Problems solved by technology

[0007] 1. The above-mentioned utility model patent 1 belongs to the on-off type cartridge valve, which cannot realize high-precision proportional control; 2. The above-mentioned utility model patent 2 uses an ordinary proportional valve as its pilot valve, because the proportional electromagnet of the pilot valve has a large hysteresis and linearity. poor, a displacement sensor must be installed on the main spool, and a dedicated digital amplifier must be configured to perform closed-loop control on the main spool. The structure is complex and has adverse effects on reliability; 3. The above-mentioned utility model patent 3 uses a linear motor to directly drive the plug-in Spool, more power required

Direct linear motion motors have low technical maturity and product industrialization level, and their application is relatively difficult; rotary-to-linear motion motors rely on mechanical screw mechanisms to convert motor rotation into linear displacement. Poor; 4. The invention described in the above-mentioned invention patent application documents uses a driving mechanism to drive the limit ejector rod to change the maximum opening of the valve core relative to the valve sleeve. It belongs to the on-off type cartridge valve and cannot achieve high-precision proportional control. ; 5. The existing proportional cartridge valve uses a high-precision proportional valve as its pilot valve. Displacement sensors must be installed on the pilot valve core and the main valve core, and a special digital amplifier is equipped to perform double closed-loop control on the two-stage valve core. The structure and electric control system are complex, difficult to manufacture, inconvenient to use, and poor in economy

6. The cartridge spool and control piston of the existing proportional cartridge valve have an integral structure, and cannot be equipped with standard cartridge components

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