Electric switching device for injection valve for chromatography

Abstract

The invention relates to the technical field of an electric switching driving device for a sample valve for chromatography, and belongs to an electric switching device for the sample valve for chromatography. The electric switching device for the sample valve for the chromatography comprises an installing seat body, the sample valve the chromatography, a step motor, a photoelectric switch, a rotating shaft, a light shielding sheet, a step motor driver and a controller, wherein the sample valve for chromatography is fixedly arranged at the upper end of the installing seat body, the step motor is fixedly arranged at the lower end of the installing seat body, a power output shaft arranged at the upper end of the step motor is in transmission connection with a valve rod arranged at the lower end of the sample valve for chromatography through the rotating shaft, and the rotating shaft is sheathed in the installing seat body. The electric switching device for the sample valve for chromatography has the advantages that the structure is reasonable and compact, the use is convenient, the step motor is controlled to rotate by the controller, in addition, the valve rod of the sample valve for chromatography is driven to rotate through the rotating shaft, and the air path switching is realized; the goals of automatic control and fast switching are achieved; meanwhile, the driving rotating angle of the step motor can be regulated through changing the parameters of the controller and the position of the photoelectric switch, the precise rotating control is realized on the sample valve for chromatography with different rotating angles, and the applicability is high.

Description

technical field [0001] The invention relates to the technical field of a sampling valve switching drive device for chromatography, and relates to an electric switching device for a sampling valve for chromatography. Background technique [0002] The sampling valve for chromatography is a gas path accessory of the gas chromatograph. It is usually used in conjunction with the quantitative tube as a gas sampling valve; when the gas sampling volume is large, it can make the gas quantification accurate and the data repeatability good; The injection valve for chromatography includes a valve body, a valve stem and a valve disc; there are multiple gas circuit joints evenly distributed on the circumference of the valve body, and the valve disc located in the valve body has holes corresponding to the gas circuit joints. There are interconnected passages in the disc; through the passages in the valve disc, the air joints are connected with each other and form an air communication mode;...

AI Technical Summary

Problems solved by technology

[0003] The present invention provides an electric switching device for sampling valves for chromatography, which overcomes the above-mentioned deficiencies in the prior art, and can effectively solve the problem that manual switching of gas circuits cannot be automatically controlled , the switching speed is slow, and the switching angle of the cylinder drive switching gas circuit cannot be adjusted

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