JPH07206267A - Traveling object abnormal part detector and manufacture of synthetic fiber using it - Google Patents

Abstract

PURPOSE:To improve detecting precision for an abnormal object by providing a contact type acceleration detecting sensor, which detects a change in vibration when an abnormal object is brought into contact with a detection end metal of the acceleration detecting sensor so as to detect an abnormal condition in a traveling object. CONSTITUTION:An abnormal part detector consists of a sensor unit and a processing unit, and the sensor unit consists of a vibration sensor 1 in which metal and piezoelectric element are combined with each other. The piezoelectric element converts acceleration (vibration) of the metal into an electric signal, and a FET amplifier amplifies an amplitude of the electric signal go as to fed it to the processing unit. A filter 2 in the processing unit cuts ordinary acceleration signals, and the acceleration signal due to contact with an abnormal object is extracted. This acceleration signal is amplified by an amplifier 3, and the amplified signal is compared with a threshold value 4 in a comparison unit 5, and if a signal beyond the threshold value is generated, it is determined whether the number of times of the generation of signals beyond the threshold value exceeds the predetermined number of times within the predetermined duration in a time measuring unit 7 or not, and then, the abnormal object is determined if it is YES.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention uses a contact type acceleration detection sensor to detect an abnormality of a moving object in a production process and an inspection process of a long object, so that the abnormal object comes into contact with a detection end metal of the acceleration detection sensor. The present invention relates to a device for detecting an abnormality of a moving object due to a change in vibration and a method for manufacturing synthetic fibers using the device.

[0002]

2. Description of the Related Art Conventionally, an abnormality of a moving object is detected in a production process and an inspection process of a long product, and a change in the amount of light that interrupts the optical axis between the light emitting element and the light receiving element while the moving object is moving. There is known a method of detecting a change in capacitance or a change in volume due to an abnormal substance between electrodes as a change in capacitance. However, in the above-mentioned method, there is erroneous detection due to the vibration of the running thread-like object, and because it is detected in the running state, the optical system by the combination of the light emitting element and the light receiving element, the electrostatic capacity by the combination of electrodes In the formula, it is necessary to detect at the moment when an abnormal object passes through the sensor, and the detection is unstable, and the change amount of the signal in the minute abnormal object in the traveling object is small and the determination is unstable. was there. Under such circumstances, the speeding up of the production process of a long product, the inspection process, and the like has advanced, and it has become difficult to detect an abnormal object. Further, there is a need for a device that detects as small an abnormality as possible of an object running at high speed. Therefore, it is required to further improve the detection accuracy of the abnormal object.

[0003]

DISCLOSURE OF THE INVENTION Problems to be Solved by the Invention In order to improve the above-mentioned drawbacks of the prior art and to respond to the recent improvement of high-speed production technology, an abnormal part detection device having improved detection accuracy of an abnormal object and a synthetic fiber using the device. It is an object to provide a manufacturing method.

[0004]

[Means for Solving the Problems] Means for solving the above problems, that is, the present invention is to provide a vibration sensor section composed of a detection end metal, a piezoelectric element and an amplifier and a filter, an amplifying section, a comparing section, a counting section, An apparatus for detecting an abnormal portion of a traveling object, which is mainly composed of a processing section including an interlock and an output section, and a melt spinning step when heat-drawing a melt-spun fiber yarn and winding it by a winder. In the winding step, the abnormal part detecting device according to claim 1 is incorporated, and the detection end metal of the vibration sensor part is arranged close to the running object.

The running object in the present invention refers to a long body that travels in the manufacturing process of a long one, and if it is a thin continuous long body, it may be any one of synthetic fibers, metal fibers, natural fibers and the like. However, synthetic fibers are particularly suitable.

Examples of the synthetic fiber include nylon, polyester, acrylic, polyethylene, polypropylene, polyurethane and the like. Particularly, a running yarn during the production of polyester or nylon fiber produced by melt spinning is preferable.

The abnormal portion in the present invention is a generic term for a portion of the quality of the running object which is different from the normal shape of the running object in terms of quality control, specifically, fluff, loop, Say drip etc.

According to the present invention, since the abnormality of the traveling object is different from that of the normal object, the acceleration of the metal changes due to the contact of the abnormal object with the metal. This change in acceleration is converted into an electric signal by the piezoelectric element and sent to the processing device, and the signal processing device discriminates and detects the abnormal object.

These abnormal portions are deformed, protruded or entangled with respect to the moving object, and these are brought into contact with the detection end metal to detect a change in acceleration (vibration) of the metal. A filter is used to cut the electrical signal due to the acceleration (vibration) of the metal under normal conditions, and only the electrical signal when an abnormal object contacts the metal is extracted and detected.
A filter is a device that separates electric signals by frequency, and cuts the signal frequency under normal conditions, and extracts only electric signals that an abnormal object contacts. The setting of this filter is variable depending on the usage conditions, abnormal objects, and the like. As a result, the signal of the minute abnormal object can be amplified and the range of the detected object is expanded. In addition, since the acceleration (vibration) of the metal due to contact with an abnormal object is detected, the higher the speed of the running object, the higher the signal obtained, and the longer the acceleration (vibration) signal. .

The abnormal portion detecting apparatus of the present invention will be described with reference to FIG. Incidentally, FIG. 1 is a block diagram of the abnormal portion detecting device.
This device is divided into a sensor section and a processing section by a dotted line portion. The sensor unit is a combination of a metal and a piezoelectric element.
It is composed of the vibration sensor 1. A piezoelectric element converts acceleration (vibration) of metal into an electric signal.
The amplifier amplifies the amplitude of this electric signal and sends it to the processing unit. The acceleration (vibration) of the metal is converted into an electric signal and 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 taken out. The filter 2 is an electronic component that cuts signals other than the set frequency with respect to the input electric signal. In this case, the acceleration (vibration) signal [mechanical vibration, etc.] of the metal in a normal state is cut, and an abnormality occurs. Only the acceleration (vibration) signal of the metal due to the contact of the object with the metal is retrieved.

Next, the signal of 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 easy to handle. The comparator 5 compares the amplified signals with a constant voltage that is the threshold value 4. When the signal due to the metal contact of the abnormal object exceeds a certain voltage, the signal is sent to the next circuit. This is the function of the comparison section. When the comparison unit generates a signal that exceeds a certain threshold value, the time measurement unit 7 measures the signal. When a signal that exceeds the threshold value is generated more than a set number of times within the set time, it is determined as an abnormal object, and the next object is detected. An abnormal object detection signal is sent to the electronic circuit. The condition for outputting this abnormal object detection signal is set by the interlock 8, and if it is the condition for outputting the abnormal object detection signal, the output unit 9 outputs it externally.

As described above, a highly accurate vibration type that converts an abnormality of a running object into an electric signal by converting a change in acceleration (vibration) due to contact with a metal, surely identifies the signal as an abnormal object, and outputs the signal. It is an abnormality detection device. It is possible to detect an abnormal object of a running object by contacting a metal with a deformed shape, converting a signal that vibrates the metal and changes the acceleration into an electric signal, and processes this signal by a processing unit. The amplification degree, the filter, the threshold value, etc. of the processing unit are set according to the usage conditions, the detected abnormal object, etc., so that the abnormal object can be surely detected. Abnormal objects of moving objects in the production process and the inspection process are detected, and combined with the conditions of the production process and the inspection process, information and aggregation of the abnormal objects are performed. Further, product classification in quality control, feedback to process conditions, automatic action by abnormality detection, etc. can be performed.

A method of manufacturing a synthetic fiber by incorporating the abnormal portion detecting device of the present invention will be described below with reference to FIGS.

[0014]

EXAMPLE FIG. 2 is a diagram showing an example of the implementation of the method for producing synthetic fibers according to the present invention. Heating the melt-spun fiber yarn
An apparatus including a winder which is wound on a paper tube inserted in a spindle after being taken up by a stretching Gotet roller will be described. The melt-spun fiber yarn is taken up by a Gotett roller of 10 to 13 and heated and drawn. The final roller 13 is wound up by a winder 14. Fluffs, loops, etc. generated in the yarn making process stand on the surface of the final roller in the vertical direction on the roller surface due to roller bending and roller centrifugal force. These fluffs, loops, etc. are installed so as to contact the metal (piano wire) attached to the roller side surface 15.
The term “proximity” as used in the present invention means a distance at which an abnormal portion of a traveling object, that is, fluff, loop, or the like, can come into contact with metal.

3 to 4 show detailed installation views of a vibration sensor in which a detection end metal and a piezoelectric element are combined. The metal (piano wire) is installed parallel to the roller, and fluffs, loops, etc. standing on the roller surface come into contact with the metal (piano wire). Due to mechanical restrictions, the distance between the metal (piano wire) and the roller is made as short as possible to detect all abnormal objects such as fluff and loops. A change in acceleration (vibration) of a metal (piano wire) that comes into contact is converted into an electric signal, which is sent to a processing unit to detect an abnormal object. It is possible to manage the product by combining the detection signals of fluffs, loops and the like with the conditions of the winding process such as a winder and displaying the number of fluffs and loops for each doff unit during winding of the yarn. Further, for an abnormal product, a signal to replace the empty paper tube in the standby state is output without winding up to full winding, and the number of yarns of the defective product can be reduced.

Next, an example applied to a method for producing synthetic fibers by pulling a melt-spun fiber yarn with a feed roller for drawing and then 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 16-18, is taken up by feed rollers 19-21, and is drawn. An abnormality called drip may occur in the melt-spun fiber yarn, which increases the diameter of the yarn. After the melt-spinning, the portion before the roller 22 is set so that the portion (drip) in which the diameter of the fiber yarn is increased contacts the metal. 6 to 7 show detailed installation views of a vibration sensor in which a metal and a piezoelectric element are combined. The metal (C-shaped metal object) is installed so as to follow the fiber yarn, and the drip comes into contact with the metal (C-shaped metal object) as an abnormality of the fiber yarn.
The gap between the metal (C-shaped metal object) and the fiber yarn is made as narrow as possible due to operational restrictions so that all abnormal objects such as drip can be detected. Alternatively, it is set by contacting with the fiber yarn. An abnormal object comes into contact with metal (C-shaped metal), converts the change in acceleration (vibration) into an electric signal, and sends this to the processing unit.
Detects anomalous objects.

[0017]

EFFECTS OF THE INVENTION Since the present invention has the above-described structure, it is possible to detect an abnormality of a moving object due to a long manufacturing process and an inspection process even though it is minute, and also to detect an abnormal portion of an object traveling at high speed. It can be detected sufficiently. Furthermore, since it is possible to detect abnormal parts with high accuracy in the production process, inspection process, etc., product classification by quality control and feedback to the process can be performed quickly.

[Brief description of drawings]

FIG. 1 is a block diagram of an abnormal portion detection device of 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 sensor in which a detection end metal and a piezoelectric element are combined.

FIG. 5 is a diagram showing a step of pulling a melt-spun fiber yarn by a feed roller for stretching and then shaking it off to 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 Part 18: Roller 8: Interlock 19: Feed roller 9: Output part 20: Feed roller 10: Godet roller 21: Feed roller 11: Godet roller 22: Drip detection position

Claims (2)

[Claims] 1. A vibration sensor section composed of a detection end metal, a piezoelectric element and an amplifier, and a processing section composed of a filter, an amplification section, a comparison section, a counting section, an interlock and an output section as main parts. A device for detecting an abnormal part of a moving object. 2. When the melt-spun fiber yarn is heated and drawn and wound by a winder, the abnormal part detecting device according to claim 1 is incorporated in the melt spinning process to the winding process, and a detection end of a vibration sensor part is incorporated. A method for producing a synthetic fiber, characterized in that a metal is disposed close to a running object.