JP2007007915A - Magnetic metal wire detector - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a magnetic metal wire detector capable of easily recovering the disturbance in the arrangement of magnetic metal wires embedded in a tire in the vicinity of its surface layer. <P>SOLUTION: The magnetic metal wire detector is constituted so that a high frequency AC current constant in effective value is applied through the coil of a sensor 1 to generate an AC magnetic field and the inductance of the coil is changed upon the reaction with the magnetic metal wires present within a predetermined distance from the coil to detect the presence of the magnetic metal wires on the basis of a change in the voltage across both ends of the coil. Further, the unit main body to which the sensor 1 is fixed is constituted of a nonmagnetic body and sensor units 100A and 100B are supported by unit support members 510 and 520 so as to become a non-contact state with respect to the surface of the tire 300. By this constitution, the AC magnetic field generated from the sensor 1 is not affected by the unit main body, the distance from the sensor 1 to the surface of the tire 300 can be largely set and the positional fluctuations of the sensor 1 caused by the surface unevenness of the tire 300 are not produced. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a magnetic metal wire detection device that detects an alignment disorder of a magnetic metal wire embedded in the vicinity of a surface layer of a tire.

  Conventionally, in a green tire and a finished tire after vulcanization, X-ray photography is necessary as a means for confirming the arrangement and disorder of the steel wires contained therein, which is a large work and equipment. It was. In addition, in the case of wire disturbance that does not affect the tire uniformity, etc., it was very difficult to find in the appearance inspection process.

  Therefore, a method has been devised to easily detect the disturbance of the wire contained in the tire without impairing the productivity, and various inspections are performed before shipping the tire as a product using this. . For example, as disclosed in Japanese Patent Application Laid-Open No. 7-9585, it is inspected whether there is an abnormality in the splice portion of a belt-like member embedded in a tire, or Japanese Patent Application Laid-Open No. 62-195503 or Japanese Patent Application Laid-Open No. It is inspected whether the rubber thickness on the tire surface is uniform as disclosed in Japanese Patent No. -304009.

Further, in an apparatus as disclosed in Japanese Patent Laid-Open Nos. 9-5246 and 2003-145640, the joining state of rubber is monitored during tire molding by a tire molding machine, and beads are automatically and reliably attached. The tire quality is improved by insertion.
Japanese Unexamined Patent Publication No. 7-9585 JP-A-62-195503 JP-A-8-304009 Japanese Patent Laid-Open No. 9-5246 Japanese Patent Laid-Open No. 2003-145640

  However, if a minute magnetic metal wire that does not affect the tire performance is buried in the vicinity of the tire surface layer, the inspector may check the alignment of the metal wire before shipping the product tire. It is very difficult to discover.

  Even if the above-described alignment disorder of the minute magnetic metal wires occurs in the tire, it does not lead to an accident, but it may cause discomfort to the user.

  In view of the above-described problems, an object of the present invention is to provide a magnetic metal wire detection device that can easily detect a minute alignment disorder of a magnetic metal wire that does not affect the performance of a tire embedded in the vicinity of a tire surface layer. It is.

  In order to achieve the above object, the present invention provides a magnetic metal wire detection device for detecting an alignment disorder of a magnetic metal wire embedded in the vicinity of a surface layer in a tire from the outside of the tire, comprising a sensor unit, a main unit, And the sensor unit has a coil that inputs a power supplied from the main unit to generate a magnetic field, and changes in response to the magnetic metal wire existing within a predetermined distance from the coil. A sensor for outputting a signal, a unit main body made of a non-magnetic material to which the sensor is fixed, and the sensor in a non-contact state with respect to the tire surface at a position spaced from the tire surface by a predetermined distance. A support member that supports the unit main body, the main unit based on an electric signal output from the sensor and power supply means for supplying the power to the sensor. Serial to determine whether magnetic metal line exist and a judging means for outputting the determination result.

  According to the present invention, since the sensor is fixed to the unit main body made of a non-magnetic material, the magnetic field generated from the sensor is not affected by the unit main body and changes in response to only the magnetic metal wire to be detected. To do. The sensor unit including the sensor is supported by the support member in a non-contact state with respect to the tire surface at a position spaced from the tire surface by a support member. Will not occur.

  According to the present invention, since the sensor is fixed to the unit body made of a non-magnetic material, the magnetic field generated from the sensor is not affected by the unit body, so the distance from the sensor to the tire surface is set large. Therefore, the position of the sensor unit can be easily set. Further, since the magnetic field generated from the sensor changes in response to only the magnetic metal wire to be detected, the detection sensitivity can be improved.

  The sensor unit including the sensor is supported by the support member in a non-contact state with respect to the tire surface at a position spaced from the tire surface by a support member. Therefore, accurate and stable detection can be performed.

  Therefore, it is possible to easily find the alignment disorder of the magnetic metal wires embedded in the vicinity of the surface of the tire before shipping the tire as a product, and there is no discomfort to the user.

  FIG. 1 to FIG. 8 show an embodiment of a magnetic metal wire detector according to the present invention, FIG. 1 is a block diagram showing its electric circuit, and FIG. 2 is an external view of a main part when used for tire inspection. 3 is a plan view showing the first sensor unit in one embodiment, FIG. 4 is a side view seen in the direction of arrows AA in FIG. 3, and FIG. 5 is in the direction of arrows BB in FIG. FIG. 6 is a plan view showing the second sensor unit in the embodiment, FIG. 7 is a side view seen in the direction of the arrows CC in FIG. 6, and FIG. 8 is a line DD in FIG. It is the front view seen in the arrow direction.

  In FIG. 1, 100 is a sensor unit and 200 is a main unit. The sensor unit 100 includes a sensor 1 including a coil 11 wound around an iron core, and the main unit 200 includes an operational amplifier 2, a determination circuit 3, and a high-frequency power source 4. The sensor 1, the operational amplifier 2 and the power source 4 are connected by a cable 6.

  The operational amplifier 2 receives the voltage output from the coil 11 of the sensor 1 and outputs the voltage obtained by amplifying this voltage to the determination circuit 3.

  The determination circuit 3 is composed of an electric circuit such as a comparator or a computer device, and a magnetic metal wire that disturbs alignment when the value of the voltage output from the operational amplifier 2 falls within a predetermined detection range. Is detected as having been detected.

  The high-frequency power source 4 supplies an alternating current having a predetermined frequency that has a constant effective value to the coil 11 of the sensor 1. In this embodiment, an alternating current having a frequency of 40 kHz is applied.

  The sensor 1 includes a coil 11 wound around an iron core, and generates an alternating magnetic field corresponding to a current value when the coil 11 is energized from a high-frequency power source 4. In addition, when a magnetic substance is present in the magnetic field, the reactance (impedance) of the coil 11 decreases, so that the voltage input from the coil 11 to the operational amplifier 2 (= impedance of the coil 11 × current applied to the coil 11). Decreases.

  In the present embodiment, the sensor unit 100 to which the sensor 1 is mounted is made of a non-magnetic material so that a long distance from the sensor 1 to the surface of the tire 300 can be secured. That is, in the sensor unit 100, all parts other than the iron core of the sensor 1 are made of a non-magnetic material, thereby reducing the influence of the sensor unit 100 on the AC magnetic field generated from the sensor 1, and thereby the magnetic object to be detected. The sensor 1 reacts sensitively to the body metal wire, and the distance from the sensor 1 to the surface of the tire 300 can be set large.

  FIG. 2 is an external view of a main part of a tire inspection apparatus using two magnetic metal wire detection devices described above. In the figure, reference numerals 100A and 100B denote first and second sensor units, respectively, and a sensor 1 is mounted at the tip thereof. The sensor units 100A and 100B are fixed to the unit support members 510 and 520, respectively, and the sensors 1 of the sensor units 100A and 100B are not in contact with each other in the vicinity of the shoulder portion of the tire 300 to be inspected. It arrange | positions so that it may be located in the state of. The tire 300 is fixed to the rotating shafts 410 and 420 and is rotated by a motor (not shown). In the present embodiment, the rotation shafts 410 and 420 of the tire 300 are provided vertically, and the tire 300 fixed to the rotation shafts 410 and 420 is held horizontally and rotated. For this reason, the shape of the first sensor unit 100A arranged on the upper side of the tire 300 and the shape of the second sensor unit 100B arranged on the lower side of the tire 300 take into account the ease of handling of the sensor units 100A and 100B. The shape is partially different. A portion excluding the sensor 1 in the sensor units 100A and 100B is referred to as a unit main body.

  As shown in FIGS. 3 to 5, the first sensor unit 100A includes an arm member 110A, a sensor holder 120A, a first support member 130A, a second support member 140A, a mounting plate 160A, and a bracket 170A.

  The arm member 110A is formed of a rectangular aluminum flat plate, and a nylon sensor holder 120A is fixed to the lower surface side of the distal end portion of the arm member 110A by a nonmagnetic material screw 124 via a nylon spacer 123. Further, a nylon casing 121 that houses the sensor 1 is fixed to the sensor holder 120A with screws 122. The arm member 110A is formed with an opening 111 corresponding to the non-magnetic screw 122 and an opening 112 penetrating the cable 6 connected to the sensor 1.

  The first support member 130A is composed of a horizontal piece 131 and a vertical piece 132 made of aluminum, and the vertical piece 132 is fixed to a substantially central portion in the width direction of the horizontal piece 131, and the horizontal piece 131 is disposed behind the arm member 110A. It is fixedly mounted on the upper surface side of the end portion by nonmagnetic screws 113 and 115 and a nonmagnetic nut 114. The vertical piece 132 is formed with an opening for inserting the non-magnetic bolt 151 for rotation, and at an angle of 30 degrees and 60 degrees from the horizontal piece 131 on the circumference centering on the opening. An opening is formed at this position, and ball buttons 133 and 134 for receiving balls of a ball plunger, which will be described later, are fixed to the opening positions. Further, a circular opening having a thread groove formed on the inner peripheral surface is provided at substantially the center of the vertical piece 132, and a non-magnetic screw 153 for limiting the rotation range is mounted.

  140 A of 2nd support members are comprised from the 1st vertical piece 141 and the 2nd vertical piece 142 which consist of aluminum, the 2nd vertical piece 142 is being fixed to the width direction center of the 1st vertical piece 141, and 2nd An opening for inserting the rotating bolt 151 is formed at the lower end of the vertical piece 142, and a circular opening is formed at a predetermined position of 60 degrees from the horizontal surface of the upper end of the second vertical piece 142. A ball plunger 144 and its holder 143 are mounted on the part. Further, an opening 145 having a curved shape for restricting rotation through which the screw 153 passes is formed between the opening for inserting the bolt 151 of the second vertical piece 142 and the holder 143.

  Further, the second vertical piece 142 of the second support member 140A is arranged to face the vertical piece 132 of the first support member 130A via a nylon brake shoe 154, and the vertical piece 132 is connected to the vertical piece 142 and the bolt 151. And a non-magnetic nut 152 is rotatably connected. In this state, the arm part 110A fixed to the first support member 130A can be rotated from the horizontal position to a position of 30 degrees, and the rotation restricting screw 153 moves along the opening 145 and the ball plunger. When 144 is inserted into one of the ball buttons 133 and 134, the rotation position of the arm portion 110A is fixed.

  On the other hand, the first vertical piece 141 of the second support member 140A is fixed to the right front end portion of the front surface of the rectangular mounting plate 160A arranged vertically so that the position can be changed in the vertical direction by the bolt 163. That is, two long holes 161 extending in the vertical direction are formed in the mounting plate 160A in parallel with each other, and a non-magnetic bolt 163 is inserted into these long holes 161, and the bolt 163 is formed on the second support member 140A. The first vertical piece 141 is inserted into the screw hole. Thereby, the bolt 163 can be loosened, the position of the second support member 140A can be changed along the elongated hole 161, and the bolt 163 can be tightened at a desired position to fix the second support member 140A.

  Further, a vertical piece 172 of an aluminum L-shaped bracket 170A is fixed to the left side of the rear surface of the mounting plate 160A by a non-magnetic bolt 173 so as to be rotatable. That is, the vertical piece 172 is formed with two curved openings 174, and the bolts 173 are inserted into the openings, and the bolts 173 are inserted into the screw holes of the mounting plate 160A. Thereby, the bolt 173 can be loosened, the angle of the mounting plate 160A can be changed along the two curved openings 174, and the bolt 173 can be tightened at a desired position to fix the angle of the mounting plate 160A.

  The horizontal piece 171 of the bracket 170A is provided with an opening 175 for fixing the bracket 170A to another member. In this embodiment, as shown in FIG. 2, the bracket 170A is the tip of the unit support member 510. It is fixed to. Thereby, the entire sensor unit 100A is fixed to the unit support member 510. In this state, the distance between the sensor 1 and the surface of the tire 300 is set to be 3 to 5 mm.

  The second sensor unit 100B disposed on the lower side of the tire 300 has substantially the same shape as that of the first sensor unit 100A disposed on the upper side of the tire 300 described above. And the second sensor unit 100B includes an arm member 110B and a bracket 170B having a shape different from that of the first sensor unit 100A.

  As shown in FIGS. 6 to 8, the second sensor unit 100B includes an arm member 110B, a sensor holder 120B, a first support member 130B, a second support member 140B, a mounting plate 160B, and a bracket 170B.

  The arm member 110B is made of a rectangular aluminum flat plate, and the tip of the arm member 110B is a mounting portion of the sensor holder 120B. This mounting portion has a shape slightly protruding to the right as shown in FIG. On the lower surface side, a nylon sensor holder 120B is fixed by a non-magnetic screw 124 via a nylon spacer 123. Further, a nylon casing 121 that houses the sensor 1 is fixed to the sensor holder 120B by a non-magnetic screw 122. The arm member 110B is formed with an opening 111 corresponding to the screw 122 and an opening 112 penetrating the cable 6 connected to the sensor 1.

  The first support member 130B is composed of a horizontal piece 131 and a vertical piece 132 made of aluminum, and the vertical piece 132 is fixed to a substantially central portion in the width direction of the horizontal piece 131, and the horizontal piece 131 is disposed behind the arm member 110B. It is fixedly mounted on the upper surface side of the end portion by nonmagnetic screws 113 and 115 and a nonmagnetic nut 114. The vertical piece 132 is formed with an opening for inserting the non-magnetic bolt 151 for rotation, and at an angle of 30 degrees and 60 degrees from the horizontal piece 131 on the circumference centering on the opening. An opening is formed at the position, and ball buttons 133 and 134 for receiving the balls of the ball plunger 144 are fixed to the opening positions, respectively. Further, a circular opening having a thread groove formed on the inner peripheral surface is provided in the approximate center of the vertical piece 132, and a non-magnetic screw 153 for limiting the rotation range is mounted.

  The second support member 140B is composed of a first vertical piece 141 and a second vertical piece 142 made of aluminum, and the second vertical piece 142 is fixed substantially at the center in the width direction of the first vertical piece 141. An opening for inserting the rotating bolt 151 is formed at the lower end of the vertical piece 142, and a circular opening is formed at a predetermined position of 60 degrees from the horizontal surface of the upper end of the second vertical piece 142. A ball plunger 144 and a holder 143 thereof are mounted on. Further, an opening 145 having a curved shape for restricting rotation through which the screw 153 passes is formed between the opening for inserting the bolt 151 of the second vertical piece 142 and the holder 143.

  The second vertical piece 142 of the second support member 140B is disposed to face the vertical piece 132 of the first support member 130B via a nylon brake shoe 154, and the vertical piece 132 is connected to the vertical piece 142 and the bolt 151. And a non-magnetic nut 152 is rotatably connected. In this state, the arm part 110B fixed to the first support member 130B can be rotated from the horizontal position to a position of 30 degrees, and the rotation restricting screw 153 moves along the opening 145 and the ball plunger. When 144 is inserted into one of the ball buttons 133 and 134, the rotation position of the arm portion 110B is fixed.

  On the other hand, the first vertical piece 141 of the second support member 140B is fixed to the right end portion of the front surface of the rectangular mounting plate 160B arranged vertically so that the position can be changed in the vertical direction by a bolt 163. That is, two long holes 161 extending in the vertical direction are formed in the mounting plate 160B in parallel to each other, and the non-magnetic bolts 163 are inserted into the long holes 161, and the bolts 163 are formed on the second support member 140B. The first vertical piece 141 is inserted into the screw hole. Thereby, the bolt 163 can be loosened, the position of the second support member 140B can be changed along the elongated hole 161, and the bolt 163 can be tightened at a desired position to fix the second support member 140B.

  A vertical piece 172 of an aluminum L-shaped bracket 170B is fixed to the left side of the rear surface of the mounting plate 160B by a non-magnetic bolt 173 so as to be rotatable. That is, the vertical piece 172 is formed with two curved openings 174, and the bolts 173 are inserted into the openings, and the bolts 173 are inserted into the screw holes of the mounting plate 160B. Thereby, the bolt 173 is loosened, the angle of the mounting plate 160B is changed along the two curved openings 174, and the bolt 173 is tightened at a desired position to fix the angle of the mounting plate 160B.

  The horizontal piece 171 of the bracket 170B is provided with an opening 175 for fixing the bracket 170B to another member. In this embodiment, as shown in FIG. 2, the bracket 170B is the tip of the unit support member 520. It is fixed to. As a result, the entire sensor unit 100B is fixed to the unit support member 520. In this state, the distance between the sensor 1 and the surface of the tire 300 is set to be 3 to 5 mm.

  When using the apparatus having the above configuration, as shown in FIG. 2, the sensor units 100A and 100B are fixed to the unit support members 510 and 520, respectively, and the respective sensors 1 of the sensor units 100A and 100B are to be inspected. The tire 300 is disposed in the vicinity of the shoulder portion so as to be positioned in a non-contact state with a predetermined interval. Further, when the tire 300 to be inspected interferes (contacts) with the sensor units 100A and 100B due to a chuck error, as shown in FIGS. 9 to 11, each sensor unit 100A, As the arm members 110A and 110B of the 100B rotate, the sensor units 100A and 100B move to positions away from the tire 300. Further, when replacing the tire 300, the entire sensor units 100A and 100B move together with the unit support members 510 and 520 to a position away from the tire 300.

  In addition, for example, in the case of the sensor unit 100A, the angle and distance between the tire 300 to be inspected and the sensor 1 can be changed by changing the angle of the arm member 110A as shown in FIG. 12 and FIG. As shown in FIG. 15, the arm member 110A can be easily changed by moving it vertically. The same applies to the sensor unit 100B.

  As described above, according to the present embodiment, since the sensor 1 is fixed to the unit main body made of a non-magnetic material, the magnetic field generated from the sensor 1 is not affected by the unit main body. Since the distance to the surface of 300 can be set large, the position of the sensor units 100A and 100B can be easily set. Furthermore, since the magnetic field generated from the sensor 1 changes in response to only the magnetic metal wire to be detected, the detection sensitivity can be improved.

  In addition, the sensor units 100A and 100B including the sensor 1 are supported by the unit support members 510 and 520 in a non-contact state with respect to the surface of the tire 300 at a position 3 to 5 mm apart from the surface of the tire 300. Since the position variation of the sensor 1 due to the unevenness of the surface of the tire 300 does not occur, accurate and stable detection can be performed.

  Therefore, it is possible to easily find the alignment disorder of the magnetic metal wires embedded in the vicinity of the surface of the tire 300 before shipping the tire 300 as a product.

  Note that the configuration of the above embodiment is a specific example of the present invention, and the present invention is not limited to the above configuration.

The block diagram which shows the electric system circuit of the magnetic body metal wire detection apparatus in one Embodiment of this invention 1 is an external view of a main part when a magnetic metal wire detection device according to an embodiment of the present invention is used for tire inspection. The top view which shows the 1st sensor unit in one Embodiment of this invention. The side view seen in the AA arrow direction in FIG. The front view seen in the BB line arrow direction in FIG. The top view which shows the 2nd sensor unit in one Embodiment of this invention. The side view seen in the CC line arrow direction in FIG. The front view seen in the DD arrow direction in FIG. The figure explaining the structure of the sensor unit in one Embodiment of this invention The figure explaining the structure of the sensor unit in one Embodiment of this invention The figure explaining the structure of the sensor unit in one Embodiment of this invention The figure explaining the structure of the sensor unit in one Embodiment of this invention The figure explaining the structure of the sensor unit in one Embodiment of this invention The figure explaining the structure of the sensor unit in one Embodiment of this invention The figure explaining the structure of the sensor unit in one Embodiment of this invention

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 ... Sensor, 2 ... Operational amplifier, 3 ... Decision circuit, 4 ... Power supply, 6 ... Cable, 10 ... Magnetic sensor, 11, 12 ... Coil, 13 ... Variable resistance element, 100, 100A, 100B ... Sensor unit, 110A, 110B ... Arm member, 120A, 120B ... Sensor holder, 130A, 130B ... First support member, 140A, 140B ... Second support member, 160A, 160B ... Mounting plate, 170A, 170B ... Bracket, 200 ... Main unit, 300 ... Tire , 410, 420 ... rotating shafts, 510, 520 ... unit support members.

Claims (3)

A magnetic metal wire detection device for detecting alignment disorder of a magnetic metal wire embedded near the surface layer in a tire from the outside of the tire,
It has a sensor unit and a main unit,
The sensor unit is
A sensor that inputs a power supplied from the main unit to generate a magnetic field and outputs an electrical signal that changes in response to the magnetic metal wire existing within a predetermined distance from the coil;
A unit body made of a non-magnetic material to which the sensor is fixed;
A support member that supports the unit main body so as to be in a non-contact state with respect to the tire surface at a position spaced apart from the tire surface by a predetermined distance;
The main unit is
Power supply means for supplying the power to the sensor;
A magnetic metal wire detection apparatus comprising: a determination unit that determines whether or not the magnetic metal wire is present based on an electric signal output from the sensor and outputs the determination result. The power supply means supplies an alternating current of a predetermined frequency whose effective value is constant to the coil of the sensor,
The magnetic metal wire detection device according to claim 1, wherein the determination unit determines whether or not the magnetic metal wire is present based on a change in reactance of a coil of the sensor. The said determination means determines that the said magnetic body metal wire exists when the value of the voltage between both ends of the coil which changes based on the reactance change of the said coil becomes in a predetermined range. The magnetic metal wire detector according to claim.

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