Wire diameter control system and control method during spinning and forming process of absorbable suture

Abstract

The invention relates to a system and method for controlling the diameter of absorbable suture lines in the spinning forming process. A spinning device formed by the structure of a reverse series connection double-hydraulic-cylinder transmission mechanism is adopted, and every time forward rotation and backward rotation of a direct-current servo motor are switched, a cylindrical piston A and a cylindrical piston B reciprocate once. The flowing speed of a stock solution sprayed out by a nozzle can be controlled by adjusting the rotating speed of the forward rotation and the backward rotation of the direct-current servo motor, the nozzle can be controlled to spray out nascent state yarns with the corresponding diameter according to the set flowing speed value accordingly, the yarns are treated through the working procedures of solidification liquid passing, stretching, crosslinking, washing and drying, and then the absorbable suture lines are formed through winding of a yarn winding mechanism. It is guaranteed that the input stock solution and the output stock solution are uninterrupted in the spinning process and the flowing speed of the output stock solution is almost free of fluctuation, and the absorbable suture lines with the line diameter meeting the requirement are obtained. The diameter of the detected absorbable suture lines is controlled with an improved generalized predictive control algorithm, the calculation process of the algorithm is simplified, the stability of the control system is improved, and a better control effect is achieved.

Description

technical field [0001] The invention relates to the field of suture manufacturing, in particular to a wire diameter control system and control method in the spinning and forming process of absorbable suture. Background technique [0002] my country's medical sutures have a market demand of about 1.5 billion yuan per year, but the localization rate is less than 40%. Wet spinning is the main forming process of absorbable sutures. During the forming and winding process of sutures, uniform wire diameter is the key technical index that affects the absorption period and tensile strength of sutures. Whether the pressure is constant and the wire diameter is uniform directly determine the quality of the suture. [0003] At present, the known wet spinning process is that the spinning stock solution is sent to the spinning machine after being dissolved and degassed, and then enters the spinneret after being metered by a spinning pump and filtered by a filter. After entering the coagu...

AI Technical Summary

Problems solved by technology

[0004] However, during the forming process of the spinning dope by the traditional spinning pump, because the spinning speed of the spinneret is not easy to control, it is easy to cause the thin stream of the dope to be pressed out through the spinneret hole to be uneven in thickness, resulting in the diameter of the suture after forming. uneven

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