Syringe driving mechanism and injection pump

Abstract

The invention discloses a syringe driving mechanism and an injection pump, wherein the syringe driving mechanism comprises a stand, a sliding base, a split nut, a press block, a push rod and a screw rod which is arranged in a mode of being parallel with the push rod; the stand comprises two end plates and a guide component; the split nut is meshed with the screw rod; a driven piece and a limiting part are arranged on the peripheral wall of the split nut; the driven piece is connected to the sliding base in a rotatable mode; a rotating shaft of the driven piece is parallel with the screw rod; the press block is connected to and arranged on the sliding base; the press block is elastically propped against the limiting part; a clamping part, which is clamped and matched with the limiting part, is arranged on the press block; the sliding base is movably sleeved on the push rod, and the push rod is capable of undergoing a spinning motion relative to the sliding base; a driving piece, which is transmitted and matched with the driven piece, is arranged on the push rod, and the driven piece is rotated by the driving piece when the push rod is rotated; and the split nut is completely separated from the screw rod when the limiting part is clamped into the clamping part. Through the technical scheme of the invention, a phenomenon that the split nut and the screw rod are ground in an operation of adjusting the position of a push head, so that the safety of the injection pump is guaranteed.

Description

technical field [0001] The invention relates to the technical field of syringe pumps, in particular to a syringe driving mechanism and a syringe pump. Background technique [0002] At present, the syringe pump usually engages with the screw rod through the split nut to drive the push head assembly through the screw rod. The push head assembly is mainly composed of a push rod connected with the split nut on the same sliding seat and a push rod connected The syringe is fixed on the frame, and the push head is connected to the tail of the piston rod of the syringe to push the piston rod to control the discharge of the syringe. Since the piston rods of different types of syringes have different lengths, when installing the syringe, it is usually necessary to adjust the distance between the push head and the syringe so that it is just connected to the tail of the piston rod of the syringe. [0003] The current method of adjusting the push head of the syringe pump is: the operato...

AI Technical Summary

Problems solved by technology

In the above method, in the process of adjusting the position of the push head, it is necessary to hold the dial button all the time. It is very easy for the operator to not hold the dial button in place, resulting in the split nut not being completely disengaged from the screw rod. , that is, the thread crest of the split nut and the thread crest of the screw are still facing each other. At this time, moving the push head will cause the thread crest of the split nut and the thread crest of the screw to wear each other (that is, grinding teeth), resulting in the screw and the opening and closing The nut is damaged and cannot engage the drive, preventing the syringe pump from functioning properly

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