Micro-injection pump

Abstract

The invention provides a micro-injection pump. The micro-injection pump comprises: a base; a mounting structure which is used for mounting an injector; a lead screw which is rotationally assembled onthe base; a motor of which the output shaft is in transmission connection with the lead screw; a guide structure which is arranged on the base; a moving block which is matched with the guide structure, is in threaded connection with the lead screw at the same time and does reciprocating rectilinear motion under the action of a lead screw nut mechanism, wherein the moving block is used for pushinga plunger rod of the injector to perform injection operation; an ultrasonic transducer which is fixed on the moving block; and an amplitude pole, wherein one end of the amplitude pole is connected tothe ultrasonic transducer, and the other end abuts against the plunger rod of the injector. The ultrasonic transducer is used for converting input electric power into mechanical waves, and the amplitude pole is used for improving the amplitude of the mechanical waves and transmitting the mechanical waves to the plunger rod, so that a plunger at the end of the plunger rod generates reciprocating vibration. Friction force between the plunger and the injector cavity is kinetic friction force all the time and has small friction coefficient, the influence of the friction force on the movement precision of the plunger is reduced, and the feeding precision of the plunger is improved.

Description

technical field [0001] The invention relates to a micro injection pump. Background technique [0002] With the increasingly stringent requirements for precise drug delivery in clinical medicine, microfluidic chips, drug / nutrition research, microdialysis, reactor dosing, bioreactors, cell injection, electrospinning, mass spectrometry, etc., traditional injection methods have become increasingly strict. Can not meet people's needs, resulting in a higher precision micro-injection pump. [0003] The Chinese utility model patent with the authorized notification number CN208852138U discloses a micro-injection pump device for the ICU department, which includes a base and an injection device located above the base. The top of the base is welded with a first fixed block and a second fixed block. A clamp is arranged on the fixed block, and the injection device is fixed on the top of the second fixed block through the clamp. A stepper motor is arranged between the top of the base and...

AI Technical Summary

Problems solved by technology

However, the related technology ignores the change of the friction coefficient between the liquid and the cavity and between the plunger and the cavity when the friction force changes from static friction to dynamic friction during feeding, that is, the plunger and the liquid change from static to dynamic. The friction between the cavity and the moment of injection will change, resulting in problems such as overshoot and excess injection, which will affect the feeding accuracy of the plunger

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