Spinning frame bead ring rotational speed detection device

Abstract

The invention provides a spinning frame bead ring rotational speed detection device. Eddy current sensors are mounted on one sides of steel travelers at the height of bead rings. An MCU generates square signal stimuli, the square signal stimuli form sine wave signals in coils of the eddy current sensors through transformation, and alternating magnetic fields are generated around the coils; when the bead rings rotate in the magnetic fields, magnetic lines of force are cut, reverse eddy current is induced, and a second-order magnetic field produced by the eddy current and an original magnetic field overlap, so that current in the coils is changed; as the positions of the two coils relative to the bead rings are different, current variations in the coils are different, and the variation signals are detected by a subsequent signal treatment circuit. Based on the threshold computed by the MCU, pulses generated by rotation of the bead rings are detected, and the rotational speed is calculated. The problems that according to a current photoelectric sensor, a chromatic aberration between the surface color of the bead rings and the surface color of the steel travelers has to exist and the bead rings are magnetized by a back magnetic Hall sensor are effectively solved, the defect that the detection distance of a traditional inductive transducer is short is overcome, and the detection distance is increased by 4-5 times compared with sensors of the same specification.

Description

technical field [0001] The invention relates to the technical field of spinning frame detection, in particular to a spinning frame traveler speed detection device. Background technique [0002] The traditional spinning frame has a lot of shortcomings in real-time yarn detection, and generally no relevant detection devices are installed. In this way, it is completely necessary to rely on manual inspections during the production process to visually check whether there are broken yarns or abnormal traveler speeds, etc., but still There are the following defects: First, after the yarn breakage occurs, it often takes inspection personnel to go around and come back to find it. During this period, the yarn breakage will float to both sides with the air flow, and it is very easy to contact the adjacent normal running yarn. The entanglement will cause a larger area of ​​yarn breakage or even the entire section of the machine to stop and other major accidents; second, under the high-s...

AI Technical Summary

Problems solved by technology

[0002] The traditional spinning frame has a lot of shortcomings in real-time yarn detection, and generally no relevant detection devices are installed. In this way, it is completely necessary to rely on manual inspections during the production process to visually check whether there are broken yarns or abnormal traveler speeds, etc., but still There are the following defects: First, after the yarn breakage occurs, it often takes inspection personnel to go around and come back to find it. During this period, the yarn breakage will float to both sides with the air flow, and it is very easy to contact the adjacent normal running yarn. The entanglement will cause a larger area of ​​yarn breakage or even the entire section of the machine to stop and other major accidents; second, under the high-speed operation of the traveler, the speed change is difficult to detect by manual visual inspection, which leads to uneven and consistent yarn parameters at the factory. Cotton spinning mills can only rely on frequent machine maintenance to reduce machine failure rates to improve product quality, but the degree of quality improvement by this method is very limited

[0004] Most of the popular traveler speed detection devices in the market currently use diffuse reflection infrared photoelectric sensor solutions, which are characterized by long detection distances and insensitivity to the material of the detection body, but they have high environmental requirements and require the probe to be kept clean, otherwise the detection will be affected The effect produces misjudgment, and it also has a fatal shortcoming. It has high requirements on the color and reflectance of the object to be detected, and requires a large color difference between the object to be detected and the background in order to detect stably. In actual use, there are many such In this case, the steel ring (background) and the traveler (the object to be detected) are both steel color, no color difference and high reflectance. In this case, it is difficult for the photoelectric sensor to perform stable detection. Based on this situation, some manufacturers use tape The Hall sensor sensor solution with back magnetism can solve the problem of high color difference requirements of photoelectric sensors, but the back magnetism itself has a large magnetic field, which will magnetize the traveler and steel ring, making the steel wire The magnetic force between the ring and the ring affects the actual use

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