Automatic reversing liquid phase injection pump

Abstract

The invention provides an automatic reversing liquid phase injection pump. The automatic reversing liquid phase injection pump comprises a pump, a frame, a shifting seat, a reversing stepping motor, a guiding shaft, a driving screw, an anti-backlash nut assembly, a linear bearing, a syringe connection screw, a linear driving stepping motor, a synchronous pulley with safe edges, a synchronous belt, a synchronous pulley without safe edges, a syringe and a control unit. The automatic reversing liquid phase injection pump can guarantee permanent precision cooperation with a screw to realize continuous constant transmission precision so that liquid transmission stability and sensitivity are greatly improved, regular replacement of a screw nut is avoided and a use cost is reduced. Through the guiding shaft parallel to the screw, linearity and smoothness of shifting seat linear movement are guaranteed. The automatic reversing liquid phase injection pump has a compact structure and a high automation degree, realizes high precision, stable and pulseless liquid transmission and is an ideal matching device for medical and laboratorial microscale transfusion.

Description

technical field [0001] The invention relates to the technical field of liquid-phase syringe pumps, in particular to an automatic reversible liquid-phase syringe pump used in the analysis process of high-performance liquid chromatography and medical and laboratory micro-infusion. Background technique [0002] In the process of HPLC analysis, syringes are needed to transport liquids, including sampling and setting out, etc. The driving of syringes is generally realized by various driving mechanisms or devices, among which syringe pumps are the most widely used. [0003] In the case where the liquid volume requirement must be very accurate, the total amount is small, the liquid speed needs to be slow or constant for a long time, a syringe pump should be used to achieve this purpose. [0004] The principle of the syringe pump: push the syringe through a mechanical device to achieve high-precision, smooth and pulsation-free liquid transmission. The syringe pump is composed of a ...

AI Technical Summary

Problems solved by technology

[0007] 1. The gap between the screw rod and the screw nut increases continuously with the increase of use time, so that the reciprocating movement accuracy of the syringe piston continues to decrease, and it is impossible to ensure constant infusion accuracy

[0008] 2. The fixed screw nut cannot automatically compensate for wear and tear, and can only be replaced regularly, which increases the cost of use

[0009] 3. The screw nut is directly connected to the syringe piston, and the shape and position errors generated by the screw nut and the installation process will also directly affect the linearity and stability of the linear motion of the syringe piston, thereby increasing the pulsation of liquid transmission

[0010] 4. The function is single, and it can only realize the function of liquid transportation. The addition of liquid can only be done manually, and the liquid path cannot be switched. It needs to be equipped with other equipment such as reversing valves to realize the reversing requirements.

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