JP3596017B2 - Apparatus for detecting abnormal portion of running object and method for producing synthetic fiber using the apparatus - Google Patents

Description

[0001]
[Industrial applications]
According to the present invention, in a production process and an inspection process of a long object, an abnormality of a traveling object is detected by a contact-type acceleration detection sensor. The present invention relates to a device for detecting an abnormality of a running object and a method for producing a synthetic fiber using the device.
[0002]
[Prior art]
Conventionally, the detection of an abnormality of a traveling object in a production process or an inspection process of a long product, in a state where the traveling object is traveling, detects a change in the amount of light blocking an optical axis between the light emitting element and the light receiving element, There is known a method of detecting a change in volume due to an abnormal object between electrodes as a change in capacitance. However, in the above-described method, there is an erroneous detection due to vibration of a running thread-like object or the like, and detection is performed in a running state. Therefore, an optical system using a combination of a light emitting element and a light receiving element, and a capacitance using a combination of electrodes. In the formula, the detection must be performed at the moment when the abnormal object passes through the sensor, and the detection is unstable, and the change amount of the signal of the small abnormal object in the traveling object is small and the determination is unstable. was there. Under such circumstances, the speed of the production process and the inspection process for long products has been increased, and it has become difficult to detect abnormal objects. Further, there is a need for a device for detecting as little as possible a minute abnormality of an object traveling at high speed. Therefore, further improvement in the detection accuracy of abnormal objects is required.
[0003]
[Problems to be solved by the invention]
It is an object of the present invention to provide an abnormal part detection device which improves the above-described disadvantages of the conventional technology and improves the accuracy of detecting an abnormal object in order to respond to the improvement of recent high-speed production technology, and a method of manufacturing a synthetic fiber using the device. is there.
[0004]
[Means for Solving the Problems]
Means for solving the above problems, that is, the present invention provides a vibration sensor unit including a detection end metal, a piezoelectric element and an amplifier, a filter, an amplifier, a comparator, a time measuring unit, a counting unit, an interlock and an output unit. In a device for detecting an abnormal part of a running object, which mainly includes a processing unit composed of a processing unit, when a signal exceeding a certain threshold is generated by a comparison unit, the signal is measured by a time measurement unit. When the occurrence of a signal exceeding the threshold value is counted by the counting unit, it is determined that the object is an abnormal object, and an abnormal object detection signal is sent to the interlock. When the apparatus and the melt-spun fiber yarn are heated and stretched and wound by a winder, the abnormal part detecting device according to claim 1 is incorporated in the melt-spinning step to the winding step, and vibration is performed. A method for producing synthetic fibers, characterized in that arranged close to the detection end metal capacitors portion in the traveling object.
[0005]
The running object in the present invention is a long body that runs in the manufacturing process of a long thing, and any synthetic fiber, metal fiber, natural fiber, or the like may be used as long as it is a thin continuous long body. However, synthetic fibers are particularly suitable.
[0006]
Examples of the synthetic fibers include nylon, polyester, acrylic, polyethylene, polypropylene, and polyurethane. Among them, running yarns during the production of polyester and nylon fibers produced by melt spinning are preferred.
[0007]
The abnormal part in the present invention is a general term for a part different from a normal form of a traveling object in a form of quality management that is out of a management limit, and specifically, a fluff, a loop, a drip, and the like. To tell.
[0008]
According to the present invention, the abnormality of a running object is deformed compared to a normal object, and the acceleration of the metal changes due to the contact of the abnormal object with the metal. The change in acceleration is converted into an electric signal by a piezoelectric element and sent to a processing device, and the signal processing device determines and detects an abnormal object.
[0009]
These abnormal portions are deformed, project, or become entangled with the running object. The abnormal portions are brought into contact with the metal at the detection end to detect a change in the acceleration (vibration) of the metal. The electric signal due to the acceleration (vibration) of the metal in a normal state is cut by using a filter, and only the electric signal when the abnormal object comes into contact with the metal is extracted and detected. A filter is a device that separates an electric signal by frequency, cuts a signal frequency in a normal state, and extracts only an electric signal that is in contact with an abnormal object. The setting of this filter varies depending on usage conditions, abnormal objects, and the like. As a result, even a signal of a minute abnormal object can be amplified, and the range of the detected object is widened. Further, since the acceleration (vibration) of the metal due to the contact with the abnormal object is detected, a higher signal is obtained as the traveling object moves faster, and a signal of a longer acceleration (vibration) is obtained. .
[0010]
An abnormal part detecting device according to the present invention will be described with reference to FIG. FIG. 1 is a block diagram of the abnormal portion detecting device. This device is divided into a sensor unit and a processing unit by a dotted line. The sensor section is constituted by a vibration sensor 1 in which a metal and a piezoelectric element are combined. The piezoelectric element converts the acceleration (vibration) of the metal into an electric signal, and the FET amplifier amplifies the amplitude of the electric signal and sends it to the processing unit. The acceleration (vibration) of the metal is converted into an electric signal, sent to the processing unit, the normal acceleration (vibration) signal is cut by the filter 2 of the processing unit, and the acceleration (vibration) signal due to the contact of the abnormal object is extracted. The filter 2 is an electronic component that cuts a signal other than a set frequency from an input electric signal. In this case, a normal state of an acceleration (vibration) signal [mechanical vibration or the like] of a metal is cut, and the abnormality is abnormal. Only the acceleration (vibration) signal of the metal due to the contact of the object with the metal is extracted.
[0011]
Next, the signal of the acceleration (vibration) when the abnormal object comes into contact with the metal is amplified by the amplification unit 3 to a voltage at which the electric signal is easily handled. The amplified signal is compared by the comparator 5 at a constant voltage which is the threshold value 4. When a signal due to a metal contact of an abnormal object exceeds a certain voltage, a signal is sent to the next circuit. This is the function of the comparison unit. When a signal exceeding a certain threshold value is generated by the comparing unit, the time measuring unit 7 measures the signal. When a signal exceeding the threshold value exceeds the set number of times within the set time, it is determined that the object is an abnormal object. An abnormal object detection signal is sent to the electronic circuit. The condition for outputting the abnormal object detection signal is set by the interlock 8. If the condition for outputting the abnormal object detection signal is satisfied, the output unit 9 outputs the signal externally.
[0012]
As described above, a high-precision vibration-type abnormality detection device that converts a change in acceleration (vibration) due to metal contact into an electrical signal, and that the processing unit reliably identifies and outputs the signal as an abnormal object as described above. It is. It is possible to convert a signal in which an abnormal object of a running object comes into contact with a metal due to an irregular shape and the acceleration of the metal changes due to the vibration of the metal into an electric signal, and process this signal by a processing unit to detect the signal. The amplification degree, filter, threshold value, etc. of the processing section are set according to the use conditions, detected abnormal objects, etc., so that abnormal objects can be detected reliably. An abnormal object of a traveling object in a production process, an inspection process, and the like is detected, and information and counting of abnormal objects are performed in combination with conditions of the production process and the inspection process. In addition, product classification in quality control, feedback to process conditions, automatic action by abnormality detection, and the like can be performed.
[0013]
Hereinafter, a method for producing a synthetic fiber by incorporating the abnormal part detection device of the present invention will be described with reference to FIGS.
[0014]
【Example】
FIG. 2 is a diagram showing an example of an embodiment of the method for producing a synthetic fiber of the present invention.
A description will be given of a device comprising a winder which takes up a melt-spun fiber yarn with a gotet roller for heating and stretching, and then winds it around a paper tube inserted into a spindle. The melt-spun fiber yarn is picked up by 10 to 13 gottering rollers, heated and drawn. The final roller 13 is wound by a winder 14. Fluff, loops, and the like generated in the spinning process stand in the vertical direction of the roller surface due to roller bending and roller centrifugal force on the surface of the final roller. The fluff, loop, and the like are installed so as to come into contact with metal (piano wire) attached to the roller side surface 15. In the present invention, the proximity refers to a distance at which an abnormal portion of a running object, that is, a fluff, a loop, or the like, can contact metal.
[0015]
FIGS. 3 and 4 show detailed installation diagrams of a vibration sensor in which a detection end metal and a piezoelectric element are combined. The metal (piano wire) is installed in parallel with the roller, and fluff, loops, and the like standing from the roller surface come into contact with the metal (piano wire). The interval between the metal (piano wire) and the roller is made as short as possible due to mechanical restrictions, and all abnormal objects such as fluff and loops are detected. The change in acceleration (vibration) of the contacted metal (piano wire) is converted into an electric signal, which is sent to a processing unit to detect an abnormal object. The detection signal of fluff, loop, and the like is matched with the conditions of the winding process of a winder or the like, and the number of fluffs and loops per one doff unit is displayed during winding of the yarn, so that products can be managed. In addition, for abnormal products, a signal for replacing the empty paper tube in a standby state without being wound up until full winding is output, and the number of yarns of defective products can be reduced.
[0016]
Next, an example in which the method is applied to a method for producing a synthetic fiber by pulling a melt-spun fiber yarn with a feed roller for stretching and dropping it into a can will be described.
This method will be described with reference to FIG. The melt-spun fiber yarn passes through rollers 16 to 18, is taken up by feed rollers 19 to 21, and drawn. In some cases, an abnormality called drip occurs in the melt-spun fiber yarn, which increases the diameter of the yarn. A portion where the diameter of the fiber yarn is increased (drip) at a portion 22 before the roller after the melt spinning is set so as to come into contact with the metal.
6 and 7 show detailed installation diagrams of a vibration sensor combining a metal and a piezoelectric element. The metal (C-shaped metal) is placed along the fiber thread, and the drip contacts the metal (C-shaped metal) as an abnormality of the fiber yarn. The gap between the metal (C-shaped metal) and the fiber yarn is made as narrow as possible due to operation restrictions, and all abnormal objects such as drip are detected. Alternatively, it is placed in contact with the fiber yarn. The abnormal object comes into contact with a metal (C-shaped metal), converts a change in acceleration (vibration) into an electric signal, sends the signal to a processing unit, and detects the abnormal object.
[0017]
【The invention's effect】
Since the present invention has the above configuration, it is possible to detect the abnormality of the traveling object due to the production process and the inspection process of a long product despite the minuteness, and it is also possible to sufficiently detect the abnormal portion of the object traveling at high speed. is there.
Furthermore, since abnormal parts can be detected with high accuracy in the production process, the inspection process, and the like, product classification by quality control and feedback to the process can be performed quickly.
[Brief description of the drawings]
FIG. 1 is a block diagram of an abnormal part detection device according to the present invention.
FIG. 2 is a diagram showing an example of a spinning to winding step in the production of the synthetic fiber of the present invention.
FIG. 3 is a front view showing details of installation of a vibration sensor in which a detection end metal and a piezoelectric element are combined.
FIG. 4 is a side view showing details of installation of a vibration type sensor in which a detection end metal and a piezoelectric element are combined.
FIG. 5 is a view showing a step of taking out a melt-spun fiber yarn with a feed roller for stretching and then shaking the melted yarn into a can.
FIG. 6 is a front view showing an example in which a vibration sensor unit is attached to a melt spinning thinning step.
FIG. 7 is a side view showing an example in which a vibration sensor unit is attached to a melt spinning thinning step.
[Explanation of symbols]
1: Vibration sensor section 12: Godet roller 2: Filter 13: Godet roller 3: Amplifying section 14: Winder 4: Threshold section 15: Detection end metal mounting position 5: Comparison section 16: Roller 6: Counting section 17: Roller 7: Measurement Unit 18: roller 8: interlock 19: feed roller 9: output unit 20: feed roller 10: godet roller 21: feed roller 11: godet roller 22: drip detection position

Claims (2)

Vibration sensor unit composed of metal at the detection end, piezoelectric element and amplifier, and filter, amplification unit, comparison unit, time measurement unit, counting unit, processing unit composed mainly of interlock and output unit. In the abnormal part detecting device, when a signal exceeding a certain threshold is generated by the comparing part, the time measuring part measures it, and the occurrence of a signal exceeding the threshold more than the set number of times within this set time is counted by the counting part. An abnormality detection device for a traveling object, wherein the abnormality detection device is designed to determine an abnormal object and send an abnormal object detection signal to the interlock. When the melt-spun fiber yarn is heated and drawn and wound by a winder, the abnormal portion detection device according to claim 1 is incorporated in the melt spinning process and the winding process, and the detection end metal of the vibration sensor unit is used as a running object. A method for producing a synthetic fiber, wherein the synthetic fibers are arranged close to each other.

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