JP2004091958A - Abnormality detection apparatus for wire - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To detect breaking of the center wire of wire in a contact type abnormality detection apparatus for wire. <P>SOLUTION: A partial bend is formed on the wire W as a moving material to be examined by a guide roller 10. Consequently, the end part of breaking of the wire is protruded on the bend of the wire W and the protruded part is brought into contact with a detector 1 arranged in the vicinity of a traveling route of the wire to detect the breaking of the center wire of the wire. <P>COPYRIGHT: (C)2004,JPO

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
INDUSTRIAL APPLICABILITY The present invention relates to various steel cords widely used as rubber reinforcing materials for automobile tires, conveyor belts, and the like, and detects abnormalities in the cord stranded wires (wires) (abnormal twisting positions and shapes of wire strands and broken wires). The present invention relates to a wire abnormality detection device that continuously detects a wire. Here, the “cord stranded wire or wire” includes a core wire constituting the stranded wire (wire) and an outer wire material disposed outside the core wire, and the “stranded wire” is not necessarily a wire made of steel. It is not limited to a shape, but includes a general metal wire.
[0002]
[Prior art]
Generally, as a wire abnormality detecting device, a contact type in which a stranded wire (steel wire) and a sensor of a detector are in contact, and a non-contact type in which a stranded wire (steel wire) does not contact a sensor of a detector. It is known.
[0003]
As an example of a non-contact wire abnormality detection device, one disclosed in JP-A-57-50664 can be mentioned. This device
As shown in FIG. 8, the wire 010 is caused to travel through the gap 09 of the transmission toroidal core 08 and the gap 011 of the detection toroidal core 012, and a high-frequency signal is applied to the wire by the transmission toroidal core 08. Is detected by the detection toroidal core 012, and when the detected value is abnormal, it is determined that the wire 010 is abnormal.
[0004]
As an example of a contact-type wire abnormality detecting device, there is a device disclosed in JP-A-6-73677. This device is shown in FIG.
As shown in FIG. 5, the wire 010 is moved between the fixed voice 02a and the moving voice 02b attached to the base body 01, and a change in the code diameter during this movement is detected by the movement of the moving voice 02b. is there.
[0005]
[Problems to be solved by the invention]
[0006]
By the way, the above-described non-contact wire abnormality detection device can detect not only the abnormality of the outer winding forming the wire W, but also the abnormality (cut, etc.) of the core wire, but is expensive. There are points.
On the other hand, the contact-type wire abnormality detection device is inexpensive, but has a problem in that it cannot detect an abnormality in the core wire. In addition, since the outer winding of the wire W comes into contact with the detection sensor during operation, the wire Malfunction may occur due to the vibration of W, and there is a problem that a sensor (detection body) is damaged at an enlarged portion (projection portion) of the diameter of the wire W. Further, at the time of inspection, since the wire W travels in a straight line, there is also a problem that the protrusion dimension at the broken end is small, and as a result, inspection accuracy is low.
[0007]
SUMMARY OF THE INVENTION The present invention is to solve the above-mentioned problem in the contact-type wire abnormality detection device. The inspection device is provided with a guide roller for guiding the wire W, and the inspection target being moved by the guide roller is inspected. By forming a local curved portion on the wire as a body, the bent portion of the wire is raised at the end of the broken wire, and a sensor (detector) is disposed near the raised portion. This allows the wire W to be detected abnormally while maintaining a slight distance between the wire W and the detector, and the detector is supported on a frame by a rotatable holding mechanism, so that the wire is attached to the detector. An object of the present invention is to provide a wire abnormality detecting device in which when a ridge of W abuts, the detecting body rotates by the abutting action and damage of the detecting body can be prevented.
[0008]
[Means for Solving the Problems]
The present invention provides a wire abnormality detecting device for forming a local curved portion on a wire as an object to be inspected while moving, thereby causing the bent portion of the wire to protrude an end of a broken wire of the wire. A means for solving the problem is constituted by a guide roller and a detector provided near the traveling path of the wire and provided with a detecting piece at a tip end capable of abutting against a raised portion of the wire.
[0009]
Further, while the detector is maintained at a predetermined potential, the guide roller and the wire are set to a ground potential, and the end of the wire break contacts the detector, whereby the potential of the detector is grounded. This is a means for solving the problem by generating a wire abnormal signal as a potential.
[0010]
Furthermore, when the raised portion of the wire abuts on the detector, the detector is rotatably supported by a support frame so as to rotate by the abutting action and prevent damage to the detector. This is a means of solving the problem.
[0011]
Furthermore, the support frame is bolted via a pair of insulating frame plates disposed opposite to each other, and the two frame plates are interposed therebetween via a ground plate and an electrode plate connected to a low-voltage power supply. A box-shaped frame having a space in which the detector can be housed, a free shaft rotatably mounted between the pair of frame plates, and a downwardly directed set screw attached to the detector. A shaft extending through the universal shaft and extending downward; a coil spring interposed between the universal shaft and a detector in a compressed state and wound on the universal shaft; A lead wire connected between the detector and the electrode plate, a guide pin protruding from both sides of the detector, an elongated portion formed on both frame plates and parallel to the lateral direction, and one end thereof. The above guide pins can be inserted Recess and configured to by the guide groove of the guide pin having a have a means of solving the problems such.
[0012]
Further, the central angle of the local curved portion of the wire is set to 30 ° to 90 ° to provide a means for solving the problem.
[0013]
BEST MODE FOR CARRYING OUT THE INVENTION
Next, an embodiment of the present invention will be described with reference to the drawings. FIG. 1 is a top view of a wire abnormality detector as one embodiment of the present invention, FIG. 2 is a view taken on line AA of FIG. 1, FIG. 3 is a view taken on line BB of FIG. 1, and FIG. 3, FIG. 5 is a side view of the guide pin guide groove formed in the frame, and FIGS. 6 and 7 are diagrams schematically showing the operation.
[0014]
Reference numeral 5 denotes a plate-like frame plate made of nylon (made of an insulating material). A pair of frame plates 5 are arranged to face each other, and the two frame plates 5, 5 are sandwiched between them by an electrode plate 6 and The box-shaped frame 5A having a space therein is formed by being tightened with the bolts 20 via the ground plate 7. In the internal space of the frame 5A, a detector 1 having a detection piece 1a at the tip is disposed so that both side surfaces thereof are slidably held between the inner surfaces of both frame plates 5,5. Reference numeral 21 denotes a washer, reference numeral 8 denotes a mounting bracket, and reference numeral 9 denotes a gantry mounted on the upper surface of the mounting bracket. Further, a low-voltage power supply (not shown) is connected to the electrode plate 6.
[0015]
A downward shaft 3 is attached to the detector 1 with a set screw 3a. A universal shaft 2 is rotatably mounted between the pair of frames 5 and 5, and a shaft 3 extends downward through the universal shaft 2. A coil spring 11 is wound around the universal shaft 2 in a compressed state between the universal shaft 2 and the detecting piece 1.
Further, a coil-shaped lead wire 12 is connected between the sensing piece 1 and the electrode 6 while being supported by being wound around a protruding shaft 1 b of the sensing piece 1.
[0016]
Guide pins 4 are protrudingly provided on both side surfaces of the detection piece 1. Each guide pin 4, 4 is fitted in a guide groove 13 formed in the frame plates 5, 5.
The guide groove 13 is formed in an elongated shape in the lateral direction, and has a semicircular concave portion 13a at the left end into which the guide pin 4 can be fitted.
The support frame 10 and the guide roller 20 having the above-described configuration constitute the wire abnormality detection device of this embodiment.
The wire W is guided by the guide roller 20, and moves (runs) in a direction indicated by an arrow Y in FIGS. The figure shows an enlarged distance between the guide roller 20 and the detection piece 1a at the tip of the detector 1. However, in practice, the two members are disposed at a very close position where the guide roller 20 and the detection piece 1a never come into contact with each other.
[0017]
During the movement (running) of the wire W, the running direction of the wire W can be changed by approximately 90 ° before and after the detector 1 (left and right of the detector 1 in FIGS. 3 and 4).
By changing the running direction of the wire W by approximately 90 ° by the guide roller 20, if there is a break in the wire W, the end of the break is raised. Reference numeral 14 indicates a raised portion. Even when there is a break in the core wire of the wire W, the end of the break is raised by changing the running direction of the wire W by approximately 90 °. The protruding portion 14 protruding from the surface of the wire W collides with or comes into contact with the detection piece 1 a at the tip of the detector 1.
By this collision or contact, the electrode plate 6 is grounded through the ridge 14, the wire W and the guide roller 20. As a result, a disconnection signal is generated, and disconnection of the wire W can be detected. When a disconnection signal is generated, the disconnection signal is sent to a control device (not shown), and the operation of the wire abnormality detection device stops.
Even if the end of the break is on the guide roller 20 side, the end of the break of the wire W occurs, and the diameter of the wire W expands, so that not only the break inside the multi-stranded wire but also the guide roller 20 is caused. Side disconnection can also be detected.
[0018]
If there is a break in the outer wire of the wire W, (the dimension of) the ridge 14 at the end of the break is much larger than in the above case, and therefore,
The degree of collision received by the raised portion 14 on the detection piece 1a at the tip of the detector 1 is large. By the way, since the detector 1 is rotatably supported by the frame 5A by the universal shaft 2, the detector 1 depends on the size of the collision with the raised portion 14 received by the detecting piece 1a at the tip thereof. 3, the detector 1 can be prevented from being damaged by collision by rotating clockwise in FIG. Needless to say, a disconnection signal is transmitted in this state. Further, when the detector 1 is tilted so as to contact the ground plate 7, the detector pin 1 is always pushed upward by the restoring force of the coil spring 11, so that the guide pin 4 is fitted into the recess 13 a of the guide groove 13. This tilt state (the state shown in FIG. 4) is maintained. It goes without saying that a disconnection signal is also transmitted in this state.
[0019]
The same operation is performed when there is an abnormality in the diameter of the wire W (when the diameter is larger than the reference diameter) such as poor twisting.
[0020]
By appropriately selecting the relative positional relationship between the guide roller 20 and the detector 1, the spring force of the coil spring 11, and the like, when the disconnected end portion 14 comes into contact with the detection piece 1 a at the tip of the detector 1 with a weak contact force, It is also possible to set the detector 1 to be always in the tilted state shown in FIG. With such a configuration, malfunction of the device due to vibration of the wire W or the like can be prevented.
The local bending angle α given to the wire as the test object is preferably 30 ° to 90 °. Note that the tension applied to the wire W at the time of inspection may be an arbitrary value.
[0021]
As described above, in the wire abnormality detection device according to this embodiment, the wire W to be detected is bent by 30 ° to 90 ° by the guide roller 20, so that the broken end of the wire W is raised, and the raised portion 14 is detected. With the configuration in which the detection piece 1a of the container 1 is brought into contact with the detection piece 1a, it is possible to detect disconnection or twisting failure of the wire W. Even if the end of the break is on the guide roller side, the end of the wire break occurs, which causes the wire diameter to expand, so that not only the break inside the multi-stranded wire but also the break on the guide roller side is detected. can do.
Furthermore, since the detector can be prevented from being damaged due to collision with the broken end, the support frame 10 can be arranged close to the guide roller 20, that is, the wire W, and as a result, the wire is abnormal. It is possible to improve the detection accuracy of the detection device.
[0022]
【The invention's effect】
As described above, according to the wire abnormality detecting device of the present invention, the following effects can be obtained.
(1) When the wire to be detected is bent by the guide roller, the end of the wire breakage occurs, and the raised portion comes into contact with the detector and the diameter of the wire expands. It is possible to detect not only the internal disconnection but also the end of the disconnection on the guide roller side.
(2) Since the detector can be prevented from being damaged by a collision with the broken end, the detector can be disposed closer to the guide roller, that is, the wire, and as a result, the abnormality detection device for the wire can be used. Detection accuracy can be improved.
[Brief description of the drawings]
FIG. 1 is a top view of a wire abnormality detector according to an embodiment of the present invention.
FIG. 2 is a view taken in the direction of arrows AA in FIG. 1;
FIG. 3 is a view taken in the direction of arrows BB in FIG. 1;
FIG. 4 is an operation explanatory view corresponding to FIG. 3;
FIG. 5 is a side view of a guide pin guide groove formed in a frame.
FIG. 6 is a view schematically showing the operation and a view corresponding to FIG. 3;
FIG. 7 is a view corresponding to FIG. 3 schematically showing the operation.
FIG. 8 is a schematic diagram showing an example of a conventional non-contact wire abnormality detection device.
FIG. 9 is a schematic view showing an example of a conventional contact-type wire abnormality detection device.
[Explanation of Signs] 1: Detector, 1a: Detecting piece, 2: Free axis, 3: Shaft, 4: Guide pin, 5: Frame plate, 6: Electrode plate, 7: Ground plate, 10: Support frame, 11: Coil spring, 12: Reedsen, 13: Guide groove, 14: Raised portion, 20:
Guide roller, W: wire

Claims (5)

By forming a local curved portion on the wire as the object to be inspected while moving, a guide roller for raising the broken end of the wire to the curved portion of the wire,
A detector provided near the traveling path of the wire and having a detection piece at a tip end that can abut on the raised portion of the wire,
An abnormality detection device for a wire, comprising: The abnormality detecting device for a wire according to claim 1,
While the detector is maintained at a predetermined potential, the guide roller and the wire are set to the ground potential, and the end of the wire break contacts the detector, whereby the potential of the detector is reduced to the ground potential. A wire abnormality detection device configured to generate a wire abnormality signal. The abnormality detecting device for a wire according to claim 1,
The detector is rotatably supported by the support frame, and the detector is rotated by an abutting action of the raised portion of the wire against a detection piece provided at an upper end portion of the detector, and the detector is rotated. An abnormality detection device for a wire, which is configured to prevent breakage. The wire abnormality detection device according to claim 3,
The support frame body, a pair of insulating frame plates disposed facing each other,
A box-shaped support frame having a space in which the detectors can be housed, wherein the frame plates are fastened with bolts between them through a ground plate and an electrode plate connected to a low-voltage power supply. Body and
A universal shaft rotatably mounted between the pair of frame plates,
A shaft that is attached to the detector downward with a set screw and extends downward through the universal shaft;
A coil spring inserted in a compressed state between the universal shaft and the detector and wound around the universal shaft;
A lead wire connected between the detector and the electrode plate,
Guide pins protruding from both sides of the detector,
A wire having an elongated portion formed in each of the frame plates and parallel to the horizontal direction, and a guide groove for the guide pin having a recess at one end thereof into which the guide pin can be fitted. Anomaly detection device. The wire abnormality detection device according to claim 1,
A wire abnormality detecting device, wherein a central angle of a local curved portion of the wire is 30 ° to 90 °.

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