Micro-tension sensor for automatic winding machine

Abstract

The invention relates to a micro-tension sensor for an automatic winding machine and belongs to the technical field of industrial automatic control devices. The micro-tension sensor for the automatic winding machine comprises a shell, a shell cover, a control circuit board, a yarn guide sheet, a signal acquirer and one or one group of magnet parts, wherein the shell is provided with a shell cavity; impedance glue is filled in the shell cavity; the shell cover is fixed with the shell; the control circuit board is arranged in the shell cavity and is wrapped by the impedance glue; one end of the yarn guide sheet is fixed with one end of the control circuit board and the other end of the yarn guide shell stretches out of the shell cavity; the signal acquirer is fixed at one end, facing towards the yarn guide sheet, of the control circuit board; and the one or one group of magnet parts are arranged in the shell cavity of the shell and correspond to the signal acquirer. The micro-tension sensor for the automatic winding machine can detect small displacement of the yarn guide sheet fixed on the control circuit board, has excellent detection precision, avoids assembling and position errors, can reliably detect the winding tension of yarn passing yarn guide sheet, obviously simplifies the structure, contributes to manufacturing, is favorable for embodying economy, has small whole volume, and can be mounted on the automatic winding machine conveniently.

Description

technical field [0001] The invention belongs to the technical field of industrial automation control devices, and in particular relates to a micro-tension sensor for an automatic winding machine, which is especially suitable for detecting the tension of yarns in motion. Detection and sensing of forces in motion on objects such as optical cables, tapes, steel tapes or plastic films. Background technique [0002] As far as the textile industry is concerned, during the textile process, the change of yarn tension will directly affect the quality of the yarn and even the quality of the fabric, because the yarn goes first in the world. Therefore, in the mid-1990s, in the textile machinery represented by the automatic winder, especially the international advanced automatic winder and doubling machine, etc., were equipped with tension sensors to realize closed-loop control of yarn tension. Due to the large number of sensors required for production equipment, it is often difficult...

AI Technical Summary

Problems solved by technology

[0006] Invention Patent Authorization Notice No. CN100356152C discloses a force sensor for an automatic detection device. This patent is also output in the form of a linear voltage change after the change of the tension of the measured object in the form of a magnetic field change, so the same as the previous patent application scheme. lacking

But this patent scheme still has the following shortcomings: one, because the yarn guide mechanism is made of upper and lower yarn guide sheets and a stressed yarn guide sheet, wherein: the upper and lower yarn guide sheets are fixed on the housing, and the stressed yarn guide The piece is fixed at one end of the displacement transmission lever, and generally corresponds to the upper and lower yarn guide pieces. More precisely, the upper and lower yarn guide pieces and the stressed yarn guide piece form an isosceles triangle position relationship with each other. , at the other end of the displacement transmission lever, an eddy current generating piece is arranged, and the eddy current generating piece corresponds to the eddy current coil on the signal numerical processing control circuit board (customarily called the control circuit board) arranged in the shell cavity of the housing, so in the yarn When the thread is drawn out from the unwinding tube and wound into a bobbin by the winding bobbin, the yarn needs to pass through the third yarn guide surface on the lower yarn guide piece and the second yarn guide surface on the stressed yarn guide piece in sequence. On the guide surface and the first yarn guide surface on the upper yarn guide piece, the tension change of the yarn is transmitted to the stressed yarn guide piece, so when the stressed yarn guide piece produces a displacement consistent with the yarn tension, Then the displacement transmission lever is driven by the stressed yarn guide piece, so that the above-mentioned eddy current generating piece is also displaced correspondingly, so that the signal is fed back to the signal numerical processing control circuit board by the eddy current coil for processing (for details, please refer to paragraph 0032 of the manual)

It can be seen that the signal numerical processing control circuit board needs to rely on the change of the large displacement of the displacement transmission lever provided with the eddy current generation piece to measure the change of the winding tension of the yarn, so the detection accuracy is difficult to guarantee; Since the above-mentioned yarn guide mechanism is composed of upper and lower yarn guide sheets and stressed yarn guide sheets, the assembly error between the upper and lower yarn guide sheets and the housing, and the gap between the upper and lower yarn guide sheets and the stressed yarn guide sheets The position error and even the position error between the eddy current generating sheet and the eddy current coil exist objectively, but the degree difference is only different, so this error will also affect the accurate effect of the signal numerical processing control circuit board on the yarn winding tension detection; third, Due to the complex overall structure, such as the upper and lower yarn guide pieces of the yarn guide mechanism and the force yarn guide piece, and the use of a displacement transmission lever in addition to the signal numerical processing control circuit board, the production cost is high and the price is high; Fourth, due to the large overall volume, it is not easy to install

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