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JP2010260645A - Wear state detection device for conveyor belt - Google Patents

Wear state detection device for conveyor belt Download PDF

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Publication number
JP2010260645A
JP2010260645A JP2007225108A JP2007225108A JP2010260645A JP 2010260645 A JP2010260645 A JP 2010260645A JP 2007225108 A JP2007225108 A JP 2007225108A JP 2007225108 A JP2007225108 A JP 2007225108A JP 2010260645 A JP2010260645 A JP 2010260645A
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Prior art keywords
conveyor belt
magnet
wear
magnetic field
peak
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Japanese (ja)
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Yukinobu Nishikita
行伸 西北
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Bridgestone Corp
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Bridgestone Corp
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Priority to JP2007225108A priority Critical patent/JP2010260645A/en
Priority to PCT/JP2008/065540 priority patent/WO2009028667A1/en
Publication of JP2010260645A publication Critical patent/JP2010260645A/en
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65G—TRANSPORT OR STORAGE DEVICES, e.g. CONVEYORS FOR LOADING OR TIPPING, SHOP CONVEYOR SYSTEMS OR PNEUMATIC TUBE CONVEYORS
    • B65G43/00—Control devices, e.g. for safety, warning or fault-correcting
    • B65G43/02—Control devices, e.g. for safety, warning or fault-correcting detecting dangerous physical condition of load carriers, e.g. for interrupting the drive in the event of overheating
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65G—TRANSPORT OR STORAGE DEVICES, e.g. CONVEYORS FOR LOADING OR TIPPING, SHOP CONVEYOR SYSTEMS OR PNEUMATIC TUBE CONVEYORS
    • B65G2203/00—Indexing code relating to control or detection of the articles or the load carriers during conveying
    • B65G2203/02—Control or detection
    • B65G2203/0266—Control or detection relating to the load carrier(s)
    • B65G2203/0275—Damage on the load carrier
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65G—TRANSPORT OR STORAGE DEVICES, e.g. CONVEYORS FOR LOADING OR TIPPING, SHOP CONVEYOR SYSTEMS OR PNEUMATIC TUBE CONVEYORS
    • B65G2203/00—Indexing code relating to control or detection of the articles or the load carriers during conveying
    • B65G2203/04—Detection means
    • B65G2203/042—Sensors
    • B65G2203/043—Magnetic

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  • Control Of Conveyors (AREA)
  • Measurement Of Length, Angles, Or The Like Using Electric Or Magnetic Means (AREA)

Abstract

<P>PROBLEM TO BE SOLVED: To provide a wear state detection device for a conveyor belt capable of detecting a wear state of the conveyor belt accurately and detecting even progress of the wear state of the conveyor belt precisely by a simple configuration. <P>SOLUTION: A magnet 13 for detecting wear composed of an inclined rubber magnet 11 being inclined for both of the direction of advance of the conveyor belt 1 and the direction of its thickness and a plane magnet 12 extended into a face vertical to the direction of thickness of the conveyor belt and arranged at a position where its center opposes to a terminal of the inclined rubber magnet 11 and a reference magnet 14 being separated from the plane magnet 12 by the predetermined distance and extended into the face vertical to the direction of thickness of the conveyor belt 1 are buried in the conveyor belt 1. A peak of changes of magnetic field from the magnet 13 for detecting wear and a peak of changes of magnetic field from the reference magnet 14 are detected by a magnetic sensor 15 arranged on a surface 1a side of the conveyor belt 1 to detect a wear state of the conveyor belt 1 based on time interval of two peaks. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

本発明は、コンベヤベルトの摩耗状態を非接触にて検出する装置に関するものである。   The present invention relates to an apparatus for detecting a worn state of a conveyor belt in a non-contact manner.

従来、コンベヤベルトや送りベルトなどの摩耗状態を検出する方法としては、超音波厚さ計などを用い、コンベヤベルトの停止時に定期的にその厚さを計測する方法や、コンベヤベルト内に白ゴムや帆布などの摩耗検知層を予め埋設しておき、それらがコンベヤベルト表面に露出した時点で、当該コンベヤベルトが規定の摩耗量に達したと判定する方法が知られている（例えば、特許文献１参照）。
また、コンベヤベルト内に、表面からの深さを異ならせて複数個のセンサ（ＲＦＩＤチップ）を埋設し、そのいずれかがベルトの摩耗とともに破壊されるかまたは脱落して、上記コンベヤベルトの通過する箇所の近傍に設置されたＲＦＩＤシステムの本体の質問器との間の交信が不能となったときに、上記破壊または脱落したセンサがどの深さに埋設されていたセンサか特定することで、当該コンベヤベルトの摩耗状態を検出する方法も提案されている（例えば、特許文献２参照）
特開２００４−３５１１５号公報 西独国際特許第１９５２３５３２６号明細書 Conventionally, as a method for detecting the wear state of a conveyor belt or a feed belt, an ultrasonic thickness gauge is used to measure the thickness periodically when the conveyor belt is stopped, or white rubber is included in the conveyor belt. A method is known in which wear detection layers such as canvas and canvas are embedded in advance, and when the conveyor belt has been exposed to the surface of the conveyor belt, it is determined that the conveyor belt has reached a specified amount of wear (for example, Patent Documents). 1).
Also, a plurality of sensors (RFID chips) are embedded in the conveyor belt at different depths from the surface, one of which is destroyed or dropped off along with the wear of the belt, and passes through the conveyor belt. When communication with the interrogator of the main body of the RFID system installed in the vicinity of the place to be disabled becomes impossible, by identifying the depth at which the destroyed or dropped sensor is embedded, A method for detecting the wear state of the conveyor belt has also been proposed (see, for example, Patent Document 2).
JP 2004-35115 A West German International Patent No. 195235326

しかしながら、超音波厚さ計によるベルト厚さの測定やコンベヤベルトに摩耗検知層を埋設する方法では、ベルトの摩耗量を自動的に測定できないことに加え、コンベヤベルトの停止時しか測定できないという欠点がある。一方、コンベヤベルト内に複数のセンサを埋設する方法は、自動測定は可能であるが、多数のセンサをベルト幅方向全体及び長さ方向の広範囲にわたって埋設する必要があるため、製造が複雑になり、かつ、工数がかかってしまうといった問題点があった。
そこで、本出願人は、図５（ａ），（ｂ）に示すように、コンベヤベルト５０の表面５０ａとこのベルト５０の裏面５１ｂ側に設けられた補強材５１との間に、厚さ方向に磁化されたゴム磁石５２を、その進行方向と厚さ方向との両方に傾斜して埋設するとともに、上記ゴム磁石５２が通過する位置に上記ゴム磁石５２からの磁界の変化を検出する磁気センサ５３を配置し、上記検出した磁界の立ち上がりＰ０からそのピークＰ１までの立ち上がり時間Ｌ１を算出するとともに、この立ち上がり時間Ｌ１と、当該ベルト５０の摩耗量が０であるときの磁界の立ち上がりＰ０からそのピークＰまでの立ち上がり時間である初期立ち上がり時間Ｌとを比較して、当該コンベヤベルト５０の摩耗量を算出する方法を提案している（特願２００５−２５９２６４号）。
この方法では、コンベヤベルト５０にゴム磁石５２を埋設するという簡単な構成で、コンベヤベルト５０の摩耗量を正確に検出することができるものの、当該コンベヤベルト５０の摩耗が進行すると、上記ゴム磁石５２の発生する磁界が小さくなるため、摩耗量の検出精度が低下してしまうという欠点がある。 However, the belt thickness measurement using an ultrasonic thickness gauge and the method of embedding a wear detection layer in the conveyor belt cannot automatically measure the amount of belt wear, but can only be measured when the conveyor belt is stopped. There is. On the other hand, the method of embedding a plurality of sensors in the conveyor belt can perform automatic measurement, but it is necessary to embed a large number of sensors over the entire belt width direction and over a wide range in the length direction, which complicates manufacturing. In addition, there is a problem that man-hours are required.
Therefore, as shown in FIGS. 5A and 5B, the applicant of the present invention has a thickness direction between the front surface 50 a of the conveyor belt 50 and the reinforcing material 51 provided on the back surface 51 b side of the belt 50. A magnetic sensor which embeds the rubber magnet 52 magnetized in the direction inclined in both the traveling direction and the thickness direction and detects a change in the magnetic field from the rubber magnet 52 at a position where the rubber magnet 52 passes. 53, the rise time L1 from the detected magnetic field rise P0 to its peak P1 is calculated, and the rise time L1 and the magnetic field rise P0 when the wear amount of the belt 50 is 0 A method for calculating the amount of wear of the conveyor belt 50 by comparing with an initial rise time L that is a rise time up to a peak P is proposed (Japanese Patent Application No. 2005-2). No. 9264).
In this method, although the rubber magnet 52 is embedded in the conveyor belt 50, the wear amount of the conveyor belt 50 can be accurately detected. However, when the wear of the conveyor belt 50 proceeds, the rubber magnet 52 is used. Since the magnetic field generated is reduced, there is a disadvantage that the detection accuracy of the wear amount is lowered.

本発明は、従来の問題点に鑑みてなされたもので、簡単な構成で、コンベヤベルトの摩耗状態を正確に検出することができるとともに、摩耗が進行した状態でもコンベヤベルトの摩耗状態を精度よく検出することのできるコンベヤベルトの摩耗状態検出装置を提供することを目的とする。   The present invention has been made in view of the conventional problems, and with a simple configuration, the wear state of the conveyor belt can be accurately detected, and the wear state of the conveyor belt can be accurately detected even when the wear has progressed. An object of the present invention is to provide a conveyor belt wear state detecting device capable of detecting.

本願の請求項１に記載の発明は、コンベヤベルトの表面側に当該コンベヤベルトの進行方向と厚さ方向との両方に傾斜して埋設される、厚さ方向に磁化されたゴム磁石から成る傾斜ゴム磁石と、この傾斜ゴム磁石の当該コンベヤベルトの裏面側に埋設される、当該コンベヤベルトの厚さ方向と垂直な面内に延長しかつ厚さ方向に磁化された基準磁石と、上記コンベヤベルトの表面から離れて配置されて、上記傾斜ゴム磁石及び基準磁石からの磁界変化を検出する磁気センサと、上記磁気センサで検出した磁界変化に基づいて、当該コンベヤベルトの摩耗状態を検出する摩耗状態検出手段とを備えたことを特徴とするものである。
請求項２に記載の発明は、請求項１に記載のコンベヤベルトの摩耗状態検出装置であって、上記傾斜ゴム磁石を上記コンベヤベルトの進行方向の前側に配置し、この傾斜ゴム磁石の後ろ側に上記基準磁石を配置したものである。
請求項３に記載の発明は、請求項２に記載のコンベヤベルトの摩耗状態検出装置であって、上記摩耗検出手段は、上記磁気センサで検出した上記傾斜ゴム磁石からの磁界のピークと上記基準磁石からの磁界のピークとの時間間隔を算出するピーク間隔算出部と、この算出されたピーク間隔から、当該コンベヤベルトの摩耗状態を検出する摩耗状態検出部とを備えていることを特徴とするものである。
請求項４に記載の発明は、請求項３に記載のコンベヤベルトの摩耗状態検出装置であって、上記傾斜ゴム磁石の裏面側で、かつ、上記基準磁石よりもコンベヤベルトの進行方向前側に、当該コンベヤベルトの厚さ方向と垂直な面内に延長しかつ厚さ方向に磁化された平板磁石を配置するとともに、上記摩耗状態検出手段は、上記磁気センサで検出した上記傾斜ゴム磁石からの磁界と上記平板磁石からの磁界との合成された磁界のピークと上記基準磁石からの磁界のピークとの時間間隔から、当該コンベヤベルトの摩耗状態を検出することを特徴とするものである。 The invention according to claim 1 of the present application is an inclination composed of rubber magnets magnetized in the thickness direction, embedded on the surface side of the conveyor belt so as to be inclined in both the traveling direction and the thickness direction of the conveyor belt. A rubber magnet, a reference magnet that is embedded in the back surface of the conveyor belt of the inclined rubber magnet, extends in a plane perpendicular to the thickness direction of the conveyor belt, and is magnetized in the thickness direction; and the conveyor belt A magnetic sensor that is disposed away from the surface of the magnetic tape and detects a magnetic field change from the inclined rubber magnet and the reference magnet, and a wear state that detects a wear state of the conveyor belt based on the magnetic field change detected by the magnetic sensor And a detecting means.
A second aspect of the present invention is the conveyor belt wear state detecting apparatus according to the first aspect, wherein the inclined rubber magnet is disposed on the front side in the traveling direction of the conveyor belt, and the rear side of the inclined rubber magnet. The above-mentioned reference magnet is arranged.
A third aspect of the present invention is the conveyor belt wear state detecting device according to the second aspect, wherein the wear detecting means includes a magnetic field peak detected from the inclined rubber magnet detected by the magnetic sensor and the reference. A peak interval calculation unit that calculates a time interval from the peak of the magnetic field from the magnet, and a wear state detection unit that detects a wear state of the conveyor belt from the calculated peak interval. Is.
Invention of Claim 4 is a wear state detection apparatus of the conveyor belt of Claim 3, Comprising: On the back side of the above-mentioned inclined rubber magnet, and the direction of advancing of the conveyor belt rather than the above-mentioned reference magnet, A flat plate magnet that extends in a plane perpendicular to the thickness direction of the conveyor belt and is magnetized in the thickness direction is disposed, and the wear state detection means includes a magnetic field from the inclined rubber magnet detected by the magnetic sensor. The wear state of the conveyor belt is detected from the time interval between the peak of the combined magnetic field from the magnetic field from the flat magnet and the peak of the magnetic field from the reference magnet.

また、請求項５に記載の発明は、請求項４に記載のコンベヤベルトの摩耗状態検出装置において、上記コンベヤベルトを有機繊維から成る補強材を有するコンベヤベルトとするとともに、上記傾斜ゴム磁石の一端をコンベヤベルトの表面側に露呈させ、他端を上記補強材に接触させ、かつ、上記基準磁石と上記平板磁石とを、上記補強材の上記傾斜ゴム磁石とは反対側に配置したものである。
請求項６に記載の発明は、請求項５に記載のコンベヤベルトの摩耗状態検出装置において、コンベヤベルトの摩耗量が０のときの上記傾斜ゴム磁石からの磁界のピークと上記基準磁石からの磁界のピークとの時間間隔をＬ0、当該コンベヤベルトが摩耗限界値まで摩耗したときの摩耗量をＴ、上記平板磁石からの磁界のピークと上記基準磁石からの磁界のピークとの時間間隔をＬs、上記ピーク間隔算出部で算出されたピーク間隔をＬとするとき、当該コンベヤベルトの摩耗量ΔＴを、ΔＴ＝Ｔ×（Ｌ0−Ｌ）／（Ｌ0−Ｌs）により算出するようにしたものである。
請求項７に記載の発明は、請求項１〜請求項６のいずれかに記載のコンベヤベルトの摩耗状態検出装置において、上記傾斜ゴム磁石を磁性粉をマトリックス内に混入して磁化させたボンド磁石としたものである。 According to a fifth aspect of the present invention, in the conveyor belt wear state detecting device according to the fourth aspect, the conveyor belt is a conveyor belt having a reinforcing material made of organic fibers, and one end of the inclined rubber magnet. Is exposed to the surface side of the conveyor belt, the other end is brought into contact with the reinforcing material, and the reference magnet and the flat plate magnet are arranged on the opposite side of the inclined rubber magnet of the reinforcing material. .
The invention according to claim 6 is the conveyor belt wear state detection device according to claim 5, wherein the magnetic field peak from the inclined rubber magnet and the magnetic field from the reference magnet when the wear amount of the conveyor belt is zero. L 0 is the time interval between the peak and the wear amount when the conveyor belt is worn down to the wear limit value, and T is the time interval between the magnetic field peak from the flat magnet and the magnetic field peak from the reference magnet. s , where the peak interval calculated by the peak interval calculation unit is L, the wear amount ΔT of the conveyor belt is calculated by ΔT = T × (L 0 −L) / (L 0 −L s ). It is a thing.
A seventh aspect of the present invention is the bonded state magnet according to any one of the first to sixth aspects, wherein the inclined rubber magnet is magnetized by mixing magnetic powder in a matrix. It is what.

本発明によれば、コンベヤベルト内に、その進行方向と厚さ方向との両方に傾斜する傾斜ゴム磁石と、この傾斜ゴム磁石の当該ベルトの裏面側に埋設される、当該コンベヤベルトの厚さ方向と垂直な面内に延長する基準磁石とを埋設するとともに、上記コンベヤベルトの表面から離れて磁気センサを配置して、上記傾斜ゴム磁石と基準磁石からの磁界変化を検出し、この検出された磁界変化に基づいて、当該コンベヤベルトの摩耗状態を検出するようにしたので、簡単な構成でコンベヤベルトの摩耗量を正確に検出することができるとともに、摩耗が進行した状態でもコンベヤベルトの摩耗状態を確実に検出することができる。なお、上記基準磁石を配置する位置は、上記傾斜ゴム磁石の配置された位置よりもコンベヤベルトの進行方向の後ろ側とする方が解析する上では好ましいが、逆であっても検出は可能である。
このとき、上記磁気センサで検出した傾斜ゴム磁石からの磁界のピークと上記基準磁石からの磁界のピークとの時間間隔を算出し、この算出されたピーク間隔から、当該コンベヤベルトの摩耗状態を検出するようにすれば、摩耗が進行した状態でもコンベヤベルトの摩耗状態を精度よく検出することができる。
なお、上記傾斜ゴム磁石及び基準磁石は、それぞれ、その厚さ方向に磁化されているものとする。 According to the present invention, in the conveyor belt, the inclined rubber magnet inclined in both the traveling direction and the thickness direction, and the thickness of the conveyor belt embedded in the back side of the inclined rubber magnet. A reference magnet extending in a plane perpendicular to the direction is embedded, and a magnetic sensor is arranged away from the surface of the conveyor belt to detect a magnetic field change from the inclined rubber magnet and the reference magnet. Since the wear state of the conveyor belt is detected based on the change in the magnetic field, the wear amount of the conveyor belt can be accurately detected with a simple configuration, and the wear of the conveyor belt can be detected even when the wear has progressed. The state can be reliably detected. Note that the position where the reference magnet is disposed is preferably rearward in the traveling direction of the conveyor belt rather than the position where the inclined rubber magnet is disposed, but detection is possible even if it is reversed. is there.
At this time, the time interval between the magnetic field peak from the inclined rubber magnet detected by the magnetic sensor and the magnetic field peak from the reference magnet is calculated, and the wear state of the conveyor belt is detected from the calculated peak interval. By doing so, it is possible to accurately detect the state of wear of the conveyor belt even when the wear has progressed.
The inclined rubber magnet and the reference magnet are each magnetized in the thickness direction.

また、上記基準磁石よりもコンベヤベルトの進行方向前側、すなわち、傾斜ゴム磁石側に、当該コンベヤベルトの厚さ方向と垂直な面内に延長しかつ厚さ方向に磁化された平板磁石を配置し、上記磁気センサで検出した上記傾斜ゴム磁石からの磁界と上記平板磁石からの磁界との合成された磁界のピークと上記基準磁石からの磁界のピークとの時間間隔から、当該コンベヤベルトの摩耗状態を検出するようにすれば、上記平板磁石からの磁界は摩耗に関わらず一定でかつ安定して検出できるので、傾斜ゴム磁石の体積の減少、すなわち、コンベヤベルトの摩耗量を更に精度良く検出することができる。
また、上記コンベヤベルトを有機繊維から成る補強材を有するコンベヤベルトとするとともに、上記傾斜ゴム磁石の一端をコンベヤベルトの表面側に露呈させ、他端を上記補強材に接触させ、かつ、上記基準磁石と上記平板磁石とを、上記補強材の上記傾斜ゴム磁石とは反対側に配置する構成とすれば、ベルト表面から摩耗限界値である補強材近傍までの広い範囲の摩耗状態を検出することができる。この場合には、当該コンベヤベルトの摩耗量ΔＴは、コンベヤベルトの摩耗量が０のときの上記傾斜ゴム磁石からの磁界からの磁界のピークと上記基準磁石からの磁界のピークとの時間間隔をＬ0、当該コンベヤベルトが摩耗限界値まで摩耗したときの摩耗量をＴ、上記平板磁石からの磁界のピークと上記基準磁石からの磁界のピークとの時間間隔をＬs、上記ピーク間隔算出部で算出されたピーク間隔をＬとするとき、ΔＴ＝Ｔ×（Ｌ0−Ｌ）／（Ｌ0−Ｌs）により算出するようにすれば、当該コンベヤベルトの摩耗量ΔＴを精度良く検出することができる。
また、上記傾斜ゴム磁石を、磁性粉をマトリックス内に混入して磁化させたボンド磁石とすれば、ベルトに追従する柔軟性でかつ耐久性に優れたゴム磁石とすることができる。 Further, a flat plate magnet extending in a plane perpendicular to the thickness direction of the conveyor belt and magnetized in the thickness direction is arranged on the front side of the conveyor belt in the moving direction of the conveyor belt, that is, on the inclined rubber magnet side. From the time interval between the peak of the magnetic field synthesized from the magnetic field from the inclined rubber magnet detected by the magnetic sensor and the magnetic field from the flat magnet and the peak of the magnetic field from the reference magnet, the wear state of the conveyor belt Since the magnetic field from the flat plate magnet can be detected constantly and stably regardless of wear, the decrease in the volume of the inclined rubber magnet, that is, the amount of wear of the conveyor belt can be detected with higher accuracy. be able to.
Further, the conveyor belt is a conveyor belt having a reinforcing material made of organic fibers, one end of the inclined rubber magnet is exposed to the surface side of the conveyor belt, the other end is brought into contact with the reinforcing material, and the reference If the magnet and the flat plate magnet are arranged on the side of the reinforcing material opposite to the inclined rubber magnet, a wide range of wear states from the belt surface to the vicinity of the reinforcing material, which is the wear limit value, can be detected. Can do. In this case, the wear amount ΔT of the conveyor belt is the time interval between the magnetic field peak from the magnetic field from the inclined rubber magnet and the magnetic field peak from the reference magnet when the wear amount of the conveyor belt is zero. L 0 , T is the amount of wear when the conveyor belt is worn to the wear limit, L s is the time interval between the magnetic field peak from the flat magnet and the magnetic field peak from the reference magnet, and the peak interval calculation unit If the peak interval calculated in step S is L, the wear amount ΔT of the conveyor belt can be detected with high accuracy by calculating ΔT = T × (L 0 −L) / (L 0 −L s ). be able to.
Further, if the inclined rubber magnet is a bonded magnet in which magnetic powder is mixed in the matrix and magnetized, the rubber magnet can be flexible and follow the belt and has excellent durability.

以下、本発明の最良の形態について、図面に基づき説明する。
図１は、本最良の形態に係るコンベヤベルトの摩耗状態検出装置（以下、摩耗状態検出装置という）１０の概略構成を示す図で、図２は本発明によるコンベヤベルト１のゴム磁石の埋設部を示す横断側面図、図３は図２を磁気センサ側から見たコンベヤベルト１の平面図である。
コンベヤベルト１はゴム部材１Ａとこのコンベヤベルト１の裏面１ｂ側に介挿された、アラミド繊維等の有機繊維をカバーゴムで被覆して成る補強材１Ｂとを備えている。
摩耗状態検出装置１０は、プーリ２に巻掛けられた上記コンベヤベルト１の表面１ａと上補強材１Ｂとの間に埋設される傾斜ゴム磁石１１と上記補強材１Ｂの裏面側に埋設される平板磁石１２とから成る摩耗検知用磁石１３と、上記平板磁石１２から当該ベルト１の進行方向に所定距離離隔して配置された基準磁石１４と、上記コンベヤベルト１の表面１ａから所定距離離隔して配置される磁気センサ１５と、上記磁気センサ１５で検出した磁界変化に基づいて、当該コンベヤベルト１の摩耗状態を検出する摩耗状態検出手段１６とを備えたもので、この摩耗状態検出手段１６は、詳細には、上記磁気センサ１５で検出した上記摩耗検知用磁石１３からの磁界のピークと上記基準磁石１４からの磁界のピークとの時間間隔を算出するピーク間隔算出部１６ａと、このピーク間隔算出部１６ａで算出されたピーク間隔から当該コンベヤベルト１の摩耗状態を検出する摩耗状態検出部１６ｂとを有している。 Hereinafter, the best mode of the present invention will be described with reference to the drawings.
FIG. 1 is a diagram showing a schematic configuration of a conveyor belt wear state detecting device (hereinafter referred to as a wear state detecting device) 10 according to the best mode, and FIG. 2 is a rubber magnet embedding portion of the conveyor belt 1 according to the present invention. FIG. 3 is a plan view of the conveyor belt 1 when FIG. 2 is viewed from the magnetic sensor side.
The conveyor belt 1 includes a rubber member 1A and a reinforcing member 1B formed by covering organic fibers such as aramid fibers with a cover rubber, which is inserted on the back surface 1b side of the conveyor belt 1.
The wear state detecting device 10 includes an inclined rubber magnet 11 embedded between the surface 1a of the conveyor belt 1 wound around the pulley 2 and the upper reinforcing member 1B, and a flat plate embedded on the back side of the reinforcing member 1B. A magnet 13 for wear detection comprising a magnet 12, a reference magnet 14 disposed at a predetermined distance from the flat plate magnet 12 in the traveling direction of the belt 1, and a predetermined distance from the surface 1a of the conveyor belt 1. The apparatus includes a magnetic sensor 15 disposed and a wear state detection unit 16 that detects a wear state of the conveyor belt 1 based on a magnetic field change detected by the magnetic sensor 15. The wear state detection unit 16 includes: In more detail, between the peaks for calculating the time interval between the peak of the magnetic field from the wear detection magnet 13 detected by the magnetic sensor 15 and the peak of the magnetic field from the reference magnet 14. A calculation unit 16a, and a wear condition detecting unit 16b that detects the wear state of the conveyor belt 1 from the peak interval calculated by the peak interval calculation unit 16a.

上記傾斜ゴム磁石１１は、磁性粉をマトリックス内に分散混入して成形したボンド磁石をその厚さ方向に磁化したシート状の磁石で、上記コンベヤベルト１内に、当該コンベヤベルト１の進行方向と厚さ方向との両方に対して傾斜して埋設されている。また、上記傾斜ゴム磁石１１の先端１１ａはコンベヤベルト１の表面１ａ側に露呈しており、基端１１ｂは上記補強材１Ｂと互いに接触している。
一方、上記平板磁石１２は当該コンベヤベルト１の厚さ方向と垂直な面内に延長するシート状の磁石で、上記傾斜ゴム磁石１１と同様に、厚さ方向に磁化されている。本例では、上記平板磁石１２の中心が、上記傾斜ゴム磁石１１の基端１１ｂに対向する位置に位置するように上記平板磁石１２を配置している。
上記基準磁石１４も、上記平板磁石１２と同様に、当該コンベヤベルト１の厚さ方向と垂直な面内に延長するシート状の磁石で、厚さ方向に磁化されており、これらの磁石１１，１２，１４は、図３に示すように、当該コンベヤベルト１の幅方向全域にわたって埋設されている。
上記傾斜ゴム磁石１１に用いられる磁性粉としては、フェライトが一般的であるが、ネオジウム鉄ボロンやサマリウム鉄窒素などの希土類磁石やアルニコ磁石などを用いることにより、強い磁界を発生させることができる。なお、平板磁石１２及び基準磁石１４としては、必ずしもゴム磁石を用いる必要はないが、ゴムとの接着性などを考慮すると、上記傾斜ゴム磁石１１と同様のゴム磁石を用いることが好ましい。 The inclined rubber magnet 11 is a sheet-like magnet obtained by magnetizing a bonded magnet formed by dispersing and mixing magnetic powder in a matrix in the thickness direction thereof, and the traveling direction of the conveyor belt 1 in the conveyor belt 1. It is buried inclining with respect to both the thickness direction. The tip 11a of the inclined rubber magnet 11 is exposed on the surface 1a side of the conveyor belt 1, and the base end 11b is in contact with the reinforcing material 1B.
On the other hand, the flat magnet 12 is a sheet-like magnet that extends in a plane perpendicular to the thickness direction of the conveyor belt 1 and is magnetized in the thickness direction in the same manner as the inclined rubber magnet 11. In this example, the flat magnet 12 is arranged so that the center of the flat magnet 12 is located at a position facing the base end 11 b of the inclined rubber magnet 11.
The reference magnet 14 is also a sheet-like magnet that extends in a plane perpendicular to the thickness direction of the conveyor belt 1 and is magnetized in the thickness direction. As shown in FIG. 3, 12 and 14 are buried over the entire width direction of the conveyor belt 1.
The magnetic powder used for the inclined rubber magnet 11 is generally ferrite, but a strong magnetic field can be generated by using a rare earth magnet such as neodymium iron boron or samarium iron nitrogen, or an alnico magnet. As the flat magnet 12 and the reference magnet 14, it is not always necessary to use rubber magnets, but it is preferable to use rubber magnets similar to the inclined rubber magnets 11 in view of adhesiveness with rubber and the like.

上記磁気センサ１５としては、ガウスメータまたはループコイル等の公知の磁気検出手段を用いることができる。そして、検出感度を上げるためには、上記磁気センサ１５を上記コンベヤベルト１の表面１ａにできるだけ近い位置に配置することが好ましい。
上記磁気センサ１５の取付位置としては、図１〜図３に示すように、コンベヤベルト１のリターン側で、スクレーバ３の後方に配置することが好ましい。これにより、コンベヤベルト１で搬送された搬送物が上記スクレーバ３で掻き落とされた後のクリーンな箇所を検出することができる。また、上記磁気センサ１５の近くに、当該コンベヤベルト１の幅方向の位置を規制する幅方向ガイド４を設けるとともに、上記磁気センサ１５の反対側に当該コンベヤベルト１と磁気センサ１５の位置関係を一定に保つための厚さ方向ガイド５を設けるようにすれば、上記各磁石１１，１２，１４からの磁界を精度よく検出することができる。 As the magnetic sensor 15, known magnetic detection means such as a gauss meter or a loop coil can be used. And in order to raise detection sensitivity, it is preferable to arrange | position the said magnetic sensor 15 in the position as close to the surface 1a of the said conveyor belt 1 as possible.
The mounting position of the magnetic sensor 15 is preferably arranged behind the scraper 3 on the return side of the conveyor belt 1 as shown in FIGS. Thereby, the clean location after the conveyed product conveyed with the conveyor belt 1 is scraped off with the said scraper 3 is detectable. A width direction guide 4 is provided near the magnetic sensor 15 to regulate the position of the conveyor belt 1 in the width direction, and the positional relationship between the conveyor belt 1 and the magnetic sensor 15 is set on the opposite side of the magnetic sensor 15. If the thickness direction guide 5 for keeping constant is provided, the magnetic fields from the magnets 11, 12, and 14 can be detected with high accuracy.

次に、本発明の摩耗検出装置１０を用いてコンベヤベルト１の摩耗状態を検出する方法について説明する。
図４は上記磁気センサ１５の検出出力の時間変化を示す図で、コンベヤベルト１が図２の矢印の方向へ移動すると、磁気センサ１５には、はじめに、傾斜ゴム磁石１１と平板磁石１２とから成る摩耗検知用磁石１３からの磁界が検出される。この検出磁界は、上記傾斜ゴム磁石１１の先端１１ａが磁気センサ１５に近づくにつれて増加し、上記先端１１ａが上記磁気センサ１５に対向する位置を通過した直後にピークとなり、上記先端１１ａが上記磁気センサ１５から離れるにつれて減少する。その後、上記摩耗検知用磁石１３から所定距離離隔して配置された基準磁石１４が上記磁気センサ１５に近づくと、磁気センサ１５の検出磁界は再び増加し、上記基準磁石１４の中心が上記磁気センサ１５に対向する位置にきた時にピークとなり、その後減少する。このように、コンベヤベルト１の移動に伴って、磁気センサ１５は、上記２つのピークを検出する。
コンベヤベルト１の摩耗は、搬送に使用される表面１ａ側から進行するため、上記傾斜ゴム磁石１１はその先端１１ａ側から削られていく。
図４の一点線で示す波形は、コンベヤベルト１の摩耗量が０である初期状態における磁気センサ１５の検出出力の時間変化を示すカーブである。その後、摩耗が進行して、コンベヤベルト１の表面が図２の一点鎖線で示す位置まで後退したとすると、傾斜ゴム磁石１１の体積が減少するとともに、傾斜ゴム磁石１１の先端１１ａがコンベヤベルト１の進行方向とは反対側に後退する。したがって、摩耗が進行した状態の磁気センサ１５の検出出力は、同図の実線で示すように、減少するとともに、その立ち上がり位置及びピーク位置が上記基準磁石１４からの磁界のピーク側にずれていく。
摩耗が更に進展してコンベヤベルト１が摩耗限界値まで摩耗したとき、すなわち、上記傾斜ゴム磁石１１がコンベヤベルト１の厚さ方向に所定値だけ削り取られると、摩耗検知用磁石１３からの磁界は上記平板磁石１２からの磁界の方が大きくなるので、上記２つのピークの時間間隔は、上記平板磁石と上記基準磁石１４との間隔に相当する一定時間になる。したがって、磁気センサ１５の検出する波形の２つのピーク間の時間間隔を算出することにより、上記コンベヤベルト１の摩耗量を検出することができる。 Next, a method for detecting the wear state of the conveyor belt 1 using the wear detection device 10 of the present invention will be described.
FIG. 4 is a diagram showing the change over time of the detection output of the magnetic sensor 15. When the conveyor belt 1 moves in the direction of the arrow in FIG. 2, the magnetic sensor 15 starts from the inclined rubber magnet 11 and the flat magnet 12. A magnetic field from the wear detecting magnet 13 is detected. The detected magnetic field increases as the tip 11a of the inclined rubber magnet 11 approaches the magnetic sensor 15, and peaks immediately after the tip 11a passes the position facing the magnetic sensor 15. The tip 11a is the magnetic sensor. Decreases with distance from 15. Thereafter, when the reference magnet 14 disposed at a predetermined distance from the wear detection magnet 13 approaches the magnetic sensor 15, the magnetic field detected by the magnetic sensor 15 increases again, and the center of the reference magnet 14 is centered on the magnetic sensor. It reaches a peak when it comes to a position facing 15 and then decreases. Thus, with the movement of the conveyor belt 1, the magnetic sensor 15 detects the two peaks.
Since the wear of the conveyor belt 1 proceeds from the surface 1a side used for conveyance, the inclined rubber magnet 11 is shaved from the tip end 11a side.
The waveform shown by the dotted line in FIG. 4 is a curve showing the change over time of the detection output of the magnetic sensor 15 in the initial state where the amount of wear of the conveyor belt 1 is zero. Thereafter, if the wear progresses and the surface of the conveyor belt 1 is retracted to the position indicated by the alternate long and short dash line in FIG. 2, the volume of the inclined rubber magnet 11 decreases, and the tip 11 a of the inclined rubber magnet 11 Retreats to the opposite side of the direction of travel. Therefore, the detection output of the magnetic sensor 15 in a state where the wear has progressed decreases as indicated by the solid line in FIG. 5 and the rising position and peak position shift to the peak side of the magnetic field from the reference magnet 14. .
When the wear further progresses and the conveyor belt 1 is worn to the wear limit value, that is, when the inclined rubber magnet 11 is scraped by a predetermined value in the thickness direction of the conveyor belt 1, the magnetic field from the wear detecting magnet 13 is changed. Since the magnetic field from the flat magnet 12 becomes larger, the time interval between the two peaks is a fixed time corresponding to the interval between the flat magnet and the reference magnet 14. Therefore, the wear amount of the conveyor belt 1 can be detected by calculating the time interval between two peaks of the waveform detected by the magnetic sensor 15.

具体的には、コンベヤベルト１の摩耗量が０のときの上記傾斜ゴム磁石１１からの磁界からの磁界のピークと上記基準磁石１４からの磁界のピークとの時間間隔をＬ0、当該コンベヤベルト１が摩耗限界値まで摩耗したときの摩耗量をＴ、上記平板磁石１２からの磁界のピークと上記基準磁石１４からの磁界のピークとの時間間隔をＬs、上記ピーク間隔算出部において算出されたピーク間隔をＬ、当該コンベヤベルト１の摩耗量をΔＴとすると、摩耗量ΔＴは以下の式（１）を用いて算出することができる。
ΔＴ＝Ｔ×（Ｌ0−Ｌ）／（Ｌ0−Ｌs）‥‥（１）
このように、コンベヤベルト１に埋設された磁石１１，１２，１４からの磁界を、磁気センサ１５より測定することにより、上記コンベヤベルト１の摩耗量ΔＴを自動的に検出することができる。
なお、上記摩耗検出装置１０で検出したコンベヤベルト１の摩耗量ΔＴのデータは、図１に示すように、コンベヤベルト１の制駆動を制御するベルトコンベヤ制御装置２０に送られる。ベルトコンベヤ制御装置２０では、上記摩耗量ΔＴが所定の閾値を超えた場合に警報を発したり、ベルトコンベヤを停止させるなどの処理を行なう。 Specifically, when the wear amount of the conveyor belt 1 is 0, the time interval between the magnetic field peak from the magnetic field from the inclined rubber magnet 11 and the magnetic field peak from the reference magnet 14 is L 0 , the conveyor belt. The amount of wear when 1 wears to the wear limit value is T, the time interval between the magnetic field peak from the flat magnet 12 and the magnetic field peak from the reference magnet 14 is L s , and the peak interval calculation unit calculates the time interval. If the peak interval is L and the wear amount of the conveyor belt 1 is ΔT, the wear amount ΔT can be calculated using the following equation (1).
ΔT = T × (L 0 −L) / (L 0 −L s ) (1)
Thus, by measuring the magnetic field from the magnets 11, 12, and 14 embedded in the conveyor belt 1 with the magnetic sensor 15, the wear amount ΔT of the conveyor belt 1 can be automatically detected.
The data of the amount of wear ΔT of the conveyor belt 1 detected by the wear detection device 10 is sent to a belt conveyor control device 20 that controls braking / driving of the conveyor belt 1 as shown in FIG. The belt conveyor control device 20 performs processing such as issuing an alarm when the wear amount ΔT exceeds a predetermined threshold, or stopping the belt conveyor.

このように本最良の形態では、コンベヤベルト１内に、その進行方向と厚さ方向との両方に対して傾斜する傾斜ゴム磁石１１とコンベヤベルト１の厚さ方向と垂直な面内に延長しその中心が上記傾斜ゴム磁石１１の基端１１ｂに対向する位置に配設された平板磁石１２とから成る摩耗検知用磁石１３を埋設するとともに、上記平板磁石１２から所定距離離隔して当該コンベヤベルト１の厚さ方向と垂直な面内に延長する基準磁石１４を埋設し、上記コンベヤベルト１の表面側に配置された磁気センサ１５にて、上記摩耗検知用磁石１３からの磁界変化のピークと上記基準磁石１４からの磁界変化のピークとを検出し、上記２つのピークの時間間隔から、当該コンベヤベルト１の摩耗状態を検出するようにしたので、簡単な構成で、コンベヤベルト１の摩耗量を正確に検出することができる。また、上記平板磁石１２及び基準磁石１４からの磁界は変化しないので、摩耗が進行した状態でもコンベヤベルト１の摩耗状態を確実に検出することができる。
また、本例ではピーク値そのものではなく、ピークの時間間隔を用いてコンベヤベルト１の摩耗状態を検出しているので、コンベヤベルト１の振動等によりピーク値が変動してもコンベヤベルト１の摩耗状態を精度よく検出することができる。 As described above, in this best mode, the conveyor belt 1 extends in a plane perpendicular to the thickness direction of the conveyor belt 1 and the inclined rubber magnet 11 which is inclined with respect to both the traveling direction and the thickness direction. A wear detecting magnet 13 having a center thereof and a flat plate magnet 12 disposed at a position facing the base end 11b of the inclined rubber magnet 11 is embedded, and the conveyor belt is separated from the flat plate magnet 12 by a predetermined distance. The reference magnet 14 extending in a plane perpendicular to the thickness direction of 1 is embedded, and the magnetic sensor 15 disposed on the surface side of the conveyor belt 1 is used to detect the peak of the magnetic field change from the wear detecting magnet 13. The peak of the magnetic field change from the reference magnet 14 is detected, and the wear state of the conveyor belt 1 is detected from the time interval between the two peaks. The wear amount of the sheet 1 can be accurately detected. Further, since the magnetic fields from the flat magnet 12 and the reference magnet 14 do not change, the wear state of the conveyor belt 1 can be reliably detected even when the wear has progressed.
In this example, since the wear state of the conveyor belt 1 is detected using the peak time interval instead of the peak value itself, even if the peak value fluctuates due to vibration of the conveyor belt 1 or the like, the wear of the conveyor belt 1 is detected. The state can be detected with high accuracy.

なお、上記最良の形態では、摩耗検知用磁石１３からの磁界変化のピークと上記基準磁石１４からの磁界変化のピークとの時間間隔から、コンベヤベルト１の摩耗状態を検出するようにしたが、摩耗検知用磁石１３からの磁界のピーク値と基準磁石１４からの磁界のピーク値との比からコンベヤベルト１の摩耗状態を検出することも可能である。上記ピーク値はコンベヤベルト１の振動等により同じ摩耗状態でもその値が上下するが、摩耗検知用磁石１３と基準磁石１４とは近接して埋設されているので、上記最良の形態と同様に、コンベヤベルト１の摩耗状態を精度よく検出することができる。
また、上記例では、摩耗検知用磁石１３を傾斜ゴム磁石１１と平板磁石１２とから構成したが、上記平板磁石１２を省略しても、コンベヤベルト１の摩耗状態を検出することは可能である。この場合には、当該コンベヤベルト１の摩耗量ΔＴは上記式（１）において、Ｌs＝０とすればよいので、 ΔＴ＝Ｔ×（Ｌ0−Ｌ）／Ｌ0となる。なお、この場合には、Ｔとしてコンベヤベルト１が摩耗限界値ではなく、コンベヤベルト１の摩耗量が０のときの、補強材１Ｂからベルト表面１ａまでの厚さを用いるようにする。但し、この場合には、傾斜ゴム磁石１１の摩耗が大きいときには傾斜ゴム磁石１１からの磁界が小さくなるため、コンベヤベルト１の振動等の影響を受けやすい。したがって、本例のように、平板磁石１２を設けた場合よりも検出精度は低下する。
また、上記例では、補強材１Ｂ入りのコンベヤベルト１について説明したが、本発明は、補強材１Ｂがないコンベヤベルトにも適応可能である。なお、この場合には、平板磁石１２を傾斜ゴム磁石１１の基端１１ｂからベルト裏面１ｂ側にずらして配置することが好ましい。
また、基準磁石１４の位置を摩耗検知用磁石１３のベルト進行方向前側に配置してもよい。この場合には、摩耗が進行するとピーク間隔が開くが、摩耗量ΔＴの計算式については上記式（１）をそのまま用いることができる。 In the best mode, the wear state of the conveyor belt 1 is detected from the time interval between the peak of the magnetic field change from the wear detecting magnet 13 and the peak of the magnetic field change from the reference magnet 14. It is also possible to detect the wear state of the conveyor belt 1 from the ratio of the peak value of the magnetic field from the wear detection magnet 13 and the peak value of the magnetic field from the reference magnet 14. Although the peak value rises and falls in the same wear state due to vibration of the conveyor belt 1 and the like, since the wear detection magnet 13 and the reference magnet 14 are embedded close to each other, as in the above best mode, The wear state of the conveyor belt 1 can be detected with high accuracy.
In the above example, the wear detection magnet 13 is composed of the inclined rubber magnet 11 and the flat plate magnet 12. However, even if the flat plate magnet 12 is omitted, the wear state of the conveyor belt 1 can be detected. . In this case, since the wear amount ΔT of the conveyor belt 1 may be set to L s = 0 in the above formula (1), ΔT = T × (L 0 −L) / L 0 . In this case, the thickness from the reinforcing material 1B to the belt surface 1a when the wear amount of the conveyor belt 1 is not 0 but the wear amount of the conveyor belt 1 is 0 is used as T. However, in this case, when the wear of the inclined rubber magnet 11 is large, the magnetic field from the inclined rubber magnet 11 is small, so that it is easily affected by the vibration of the conveyor belt 1 and the like. Accordingly, the detection accuracy is lower than in the case where the flat magnet 12 is provided as in this example.
Moreover, although the said example demonstrated the conveyor belt 1 containing the reinforcing material 1B, this invention is applicable also to the conveyor belt without the reinforcing material 1B. In this case, it is preferable to dispose the flat magnet 12 so as to be shifted from the base end 11b of the inclined rubber magnet 11 toward the belt back surface 1b.
The position of the reference magnet 14 may be arranged on the front side in the belt traveling direction of the wear detection magnet 13. In this case, the peak interval opens as the wear progresses, but the above formula (1) can be used as it is for the calculation formula of the wear amount ΔT.

以上説明したように、本発明によれば、簡単な構成で、コンベヤベルトの摩耗状態を正確に検出することができるとともに、摩耗が進行した状態でもコンベヤベルトの摩耗状態を精度よく検出することができるので、ベルトコンベヤを安定して使用することができるとともに、コンベヤベルトの交換時期を正確に求めることができる。   As described above, according to the present invention, the wear state of the conveyor belt can be accurately detected with a simple configuration, and the wear state of the conveyor belt can be accurately detected even when the wear has progressed. Therefore, the belt conveyor can be used stably, and the replacement time of the conveyor belt can be accurately obtained.

本発明の最良の形態に係るコンベヤベルトの摩耗検出装置の概要を示す図である。It is a figure which shows the outline | summary of the abrasion detection apparatus of the conveyor belt which concerns on the best form of this invention. 本最良の形態に係るコンベヤベルト構成を示す横断側面図である。It is a cross-sectional side view which shows the conveyor belt structure concerning this best form. 本最良の形態に係るコンベヤベルトの平面図である。It is a top view of the conveyor belt which concerns on this best form. 磁気センサの検出出力の一例を示す図である。It is a figure which shows an example of the detection output of a magnetic sensor. 従来のコンベヤベルトの摩耗検出方法を示す図である。It is a figure which shows the abrasion detection method of the conventional conveyor belt.

符号の説明Explanation of symbols

１ コンベヤベルト、１ａ ベルト表面、１ｂ ベルト裏面、１Ａ ゴム部材、
１Ｂ 補強材、２ プーリ、３ スクレーバ、４ 幅方向ガイド、５ 厚さ方向ガイド、１０ コンベヤベルトの摩耗状態検出装置、
１１ 傾斜ゴム磁石、１１ａ 傾斜ゴム磁石の先端、１１ｂ 傾斜ゴム磁石の基端、
１２ 平板磁石、１３ 摩耗検知用磁石、１４ 基準磁石、１５ 磁気センサ、
１６ 摩耗状態検出手段、１６ａ ピーク間隔算出部、１６ｂ 摩耗状態検出部、
２０ ベルトコンベヤ制御装置。 1 conveyor belt, 1a belt surface, 1b belt back surface, 1A rubber member,
1B reinforcement material, 2 pulley, 3 scraper, 4 width direction guide, 5 thickness direction guide, 10 conveyor belt wear state detection device,
11 inclined rubber magnet, 11a tip of inclined rubber magnet, 11b proximal end of inclined rubber magnet,
12 flat magnets, 13 wear detection magnets, 14 reference magnets, 15 magnetic sensors,
16 wear state detection means, 16a peak interval calculation unit, 16b wear state detection unit,
20 Belt conveyor control device.

Claims (7)

コンベヤベルトの表面側に当該コンベヤベルトの進行方向と厚さ方向との両方に傾斜して埋設される、厚さ方向に磁化されたゴム磁石から成る傾斜ゴム磁石と、この傾斜ゴム磁石の当該コンベヤベルトの裏面側に埋設される、当該コンベヤベルトの厚さ方向と垂直な面内に延長しかつ厚さ方向に磁化された基準磁石と、上記コンベヤベルトの表面から離れて配置されて、上記傾斜ゴム磁石及び基準磁石からの磁界変化を検出する磁気センサと、上記磁気センサで検出した磁界変化に基づいて、当該コンベヤベルトの摩耗状態を検出する摩耗状態検出手段とを備えたことを特徴とするコンベヤベルトの摩耗状態検出装置。   An inclined rubber magnet composed of rubber magnets magnetized in the thickness direction, embedded on the surface side of the conveyor belt in an inclined manner in both the traveling direction and the thickness direction of the conveyor belt, and the conveyor of the inclined rubber magnet A reference magnet embedded in the back surface of the belt, extending in a plane perpendicular to the thickness direction of the conveyor belt and magnetized in the thickness direction, and disposed apart from the surface of the conveyor belt, and the inclined A magnetic sensor for detecting a magnetic field change from the rubber magnet and the reference magnet, and a wear state detecting means for detecting a wear state of the conveyor belt based on the magnetic field change detected by the magnetic sensor. Conveyor belt wear state detection device. 上記傾斜ゴム磁石を上記コンベヤベルトの進行方向の前側に配置し、この傾斜ゴム磁石の後ろ側に上記基準磁石を配置したことを特徴とする請求項１に記載のコンベヤベルトの摩耗状態検出装置。   2. The apparatus for detecting a wear state of a conveyor belt according to claim 1, wherein the inclined rubber magnet is arranged on the front side in the traveling direction of the conveyor belt, and the reference magnet is arranged on the rear side of the inclined rubber magnet. 上記摩耗検出手段は、上記磁気センサで検出した上記傾斜ゴム磁石からの磁界のピークと上記基準磁石からの磁界のピークとの時間間隔を算出するピーク間隔算出部と、この算出されたピーク間隔から、当該コンベヤベルトの摩耗状態を検出する摩耗状態検出部とを備えていることを特徴とする請求項２に記載のコンベヤベルトの摩耗状態検出装置。   The wear detection means includes a peak interval calculation unit that calculates a time interval between a magnetic field peak from the inclined rubber magnet detected by the magnetic sensor and a magnetic field peak from the reference magnet, and from the calculated peak interval. The apparatus for detecting a wear state of a conveyor belt according to claim 2, further comprising a wear state detection unit for detecting a wear state of the conveyor belt. 上記傾斜ゴム磁石の裏面側で、かつ、上記基準磁石よりもコンベヤベルトの進行方向前側に、当該コンベヤベルトの厚さ方向と垂直な面内に延長しかつ厚さ方向に磁化された平板磁石を配置するとともに、上記摩耗状態検出手段は、上記磁気センサで検出した上記傾斜ゴム磁石からの磁界と上記平板磁石からの磁界との合成された磁界のピークと上記基準磁石からの磁界のピークとの時間間隔から、当該コンベヤベルトの摩耗状態を検出することを特徴とする請求項３に記載のコンベヤベルトの摩耗状態検出装置。   A flat plate magnet extended in a plane perpendicular to the thickness direction of the conveyor belt and magnetized in the thickness direction on the back side of the inclined rubber magnet and on the front side in the traveling direction of the conveyor belt with respect to the reference magnet. In addition, the wear state detection means includes a magnetic field peak obtained by combining the magnetic field from the inclined rubber magnet detected by the magnetic sensor and the magnetic field from the flat magnet, and the magnetic field peak from the reference magnet. 4. The conveyor belt wear state detection device according to claim 3, wherein the wear state of the conveyor belt is detected from the time interval. 上記コンベヤベルトを有機繊維から成る補強材を有するコンベヤベルトとするとともに、上記傾斜ゴム磁石の一端をコンベヤベルトの表面側に露呈させ、他端を上記補強材に接触させ、かつ、上記基準磁石と上記平板磁石とを、上記補強材の上記傾斜ゴム磁石とは反対側に配置したことを特徴とする請求項４に記載のコンベヤベルトの摩耗状態検出装置。   The conveyor belt is a conveyor belt having a reinforcing material made of organic fibers, one end of the inclined rubber magnet is exposed to the surface side of the conveyor belt, the other end is in contact with the reinforcing material, and the reference magnet and The apparatus for detecting a wear state of a conveyor belt according to claim 4, wherein the flat plate magnet is disposed on the side of the reinforcing member opposite to the inclined rubber magnet. コンベヤベルトの摩耗量が０のときの上記傾斜ゴム磁石からの磁界のピークと上記基準磁石からの磁界のピークとの時間間隔をＬ0、当該コンベヤベルトが摩耗限界値まで摩耗したときの摩耗量をＴ、上記平板磁石からの磁界のピークと上記基準磁石からの磁界のピークとの時間間隔をＬs、上記ピーク間隔算出部で算出されたピーク間隔をＬとするとき、当該コンベヤベルトの摩耗量ΔＴを、ΔＴ＝Ｔ×（Ｌ0−Ｌ）／（Ｌ0−Ｌs）により算出することを特徴とする請求項５に記載のコンベヤベルトの摩耗状態検出装置。 The time interval between the magnetic field peak from the inclined rubber magnet and the magnetic field peak from the reference magnet when the wear amount of the conveyor belt is 0 is L 0 , and the wear amount when the conveyor belt is worn to the wear limit value when the T, the time interval L s and the peak of the magnetic field from the peak and the reference magnet of the magnetic field from the flat magnet, the peak interval calculated by the peak interval calculating section is L, the wear of the conveyor belt 6. The conveyor belt wear state detection device according to claim 5, wherein the amount ΔT is calculated by ΔT = T × (L 0 −L) / (L 0 −L s ). 上記傾斜ゴム磁石を、磁性粉をマトリックス内に混入して磁化させたボンド磁石としたことを特徴とする請求項１〜請求項６のいずれかに記載のコンベヤベルトの摩耗状態検出装置。   The conveyor belt wear state detection device according to any one of claims 1 to 6, wherein the inclined rubber magnet is a bonded magnet in which magnetic powder is mixed and magnetized in a matrix.
JP2007225108A 2007-08-31 2007-08-31 Wear state detection device for conveyor belt Pending JP2010260645A (en)

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