Online detection and control method of near-field electrospinning printing effect based on machine vision

Abstract

The invention discloses a machine version based online detection and control method of near field electrospinning printing effect. The method includes: grounding a collecting plate of equipment and allowing the tip of an injector to be electrically connected with direct-current high voltage; starting an electrospinning system, and allowing a motion platform to start moving according to a planned path to form a taylor cone at the tip of a spray nozzle; collecting information of wire diameter size, wire drawing state, wire bifurcation and wire fracture in real time during spinning through a vision image collector and performing online feedback and control for different situations; when D and theta exceed the set range, controlling upper computer software through a matching replacement algorithm to control speed and accelerated speed of a traction shaft motor in real time by matching and converting error amount of D or theta with pulse quantity, and fine tuning the distance H from the tipto the collecting plate when D or theta reaches nearby preset value so that the printing effect is gradually close to the parameter range till printing is steady. The method has the advantages of easy implementation, simple operation and stably system operation.

Description

technical field [0001] The invention relates to the technical field of electrospinning jet printing control, in particular to a machine vision-based online detection and control method of near-field electrospinning jet printing effect. Background technique [0002] Electrospinning technology Electrospinning technology was first proposed by Formhzls in 1934, and then Taylor et al. proposed the concept of Taylor cone for the deformation of charged polymers in the electrospinning process in 1964. It was not until the 1990s that people began to Extensive attention has been paid to electrospinning technology. However, nanofibers produced by electrospinning are difficult to collect in an orderly manner, and it is also difficult to arrange them in an orderly manner. In 2006, Sun Daoheng and others proposed the near-field electrospinning direct-writing technology. The electrospinning direct-writing technology based on near-field electrospinning utilizes the advantages of a straight...

AI Technical Summary

Problems solved by technology

In the application process of near-field electrospinning printing technology, since the voltage, printing speed, and feed speed are all controlled by one-way open-loop during the process of printing and forming filaments, the diameter of the wire and the traction of the wire during the printing process The morphology is easily disturbed, resulting in uneven filament diameter, forked filaments, and broken filaments. However, in the traditional near-field electrospinning printing process, the printing detection and control mainly rely on manual observation cameras, so the judgment is too subjective and the adjustment is difficult. big problem

For example, Chinese patent CN103952778B discloses an airflow-assisted electrospinning instrument with real-time sampling function, which uses an optical microscope to monitor the state of spinning and printing in real time, and this scheme requires more subjective judgment and operating experience for operators. High, manual observation of the camera, there is a problem that the judgment is too subjective and the adjustment is difficult

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