Design of electrostatic charge-induced yarn breakage sensors
In the spinning process,yarn breakage detection,especially for fine yarns,is an essential means to improve the performance of spinning equipment.Considering the cost and factors affecting yarn tension,yarn breakage detection in the industry is mainly based on photoelectric non-contact yarn breakage detection.The actual spinning workshop has much cotton wool and dust,which is easy to cause diffuse reflection in the photoelectric detection channel and reduce the sensor's accuracy.At the same time,changes in light intensity in the workshop will also impact the signal received by the opposite photoelectric receiver.In recent years,the spinning industry's image processing related to yarn breakage detection research is also emerging.Still,with the above-mentioned photoelectric detection principle of the same shortcomings,the approach is even more demanding on the light and installation conditions and expensive,with hundreds of spindles in the spinning process being more challenging to promote.To promote the yarn breakage detection technology for yarns,especially fine yarns,in the spinning link,it is necessary to reduce the dependence of the existing yarn breakage detection methods on the working link and installation conditions,and reduce the cost of yarn breakage detection.Based on the basic principle of electrostatic inductive detection,the electrostatic charge-induced yarn breakage sensor was constructed,and its overall structure,as well as the design of critical components such as primary signal amplification module,shaping and secondary amplification module,output and display module,were theoretically analyzed and experimentally tested.Finally,the test bench of the electrostatic charge induction yarn breakage sensor was construct to test the degree of influence of the moving yarn speed and its material on the electrostatic charge induction yarn breakage sensor in combination with the mechanism of electrostatic charge induction yarn breakage sensor performance based on the electrostatic charge induction strength.On this basis,we statistically analyzed the output point voltage values of the critical module of the electrostatic charge-induced yarn breakage sensor under the simulated working spindle speeds of the spinning machine at 13,600 r/min and 15,000 r/min,as well as under the yarn breakage condition.The research found that the speed of the moving yarn and its material are the main influencing factors of the electrostatic charge-induced yarn breakage sensor.Still,the influence is much smaller than the value of the voltage deviation at the output points OUT3 and OUT2 of the back end of the key module of the electrostatic charge-induced yarn breakage sensor when the two states of the moving yarn are broken and unbroken so that this characteristic can be used for the accurate judgment of the broken connection of the yarn.The sensor seals the circuit and detection electrodes utilizing a closed aluminium case,which reduces dust and charge interference in the air,facilitates the collection of charge signals,and obtains output voltages with significant variations for identifying different types of yarns with minor charge variations.Therefore,the device has a better state detection effect for the yarn carrying static electricity in the spinning process.
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