JP2015071493A - Conveyor belt, and annular conductor for conveyor belt - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a conveyor belt and an annular conductor for the conveyor belt in which detection error is prevented while durability of the annular conductor is improved.SOLUTION: A conveyor belt of the present invention is a conveyor belt inside of which an annular conductor for detecting a damage of a conveyor belt is arranged, and the annular conductor consists of a metal portion made of a metal material and an elastic conductive portion made of an elastic conductive material. Further, an annular conductor for conveyor belt of the present invention is an annular conductor for conveyor belt for detecting a damage of a conveyor belt, in which the metal portion and the elastic conductive portion are arrayed alternately along an extending direction of the annular conductor for conveyor belt.

Description

  The present invention relates to a conveyor belt and an annular conductor for a conveyor belt.

  Conveyor belts used in conveyor belts used for transporting minerals, earth and sand, and other transported objects, for example, sharp minerals or earth and sand in the transported objects collide with the conveyor belt, causing the surface of the conveyor belt to move. Cracks or the like may occur, wear may progress, and as a result, a longitudinal tear may occur in a state in which the crack is continuously split in the longitudinal direction of the conveyor belt.

  Here, as an object to be detected for detecting the vertical tear of the conveyor belt as described above, for example, in the conveyor belt vertical tear detection device described in Patent Document 1, a loop coil made of a metal cable (galvanized steel wire) is provided. It is used. And the longitudinal tear detection of a conveyor belt is performed by detecting the induced electric current which generate | occur | produced using the electromagnetic induction with respect to the loop coil.

JP 2011-32035 A

  By the way, when the annular conductor as the detection target for detecting the vertical tear of the conveyor belt is composed of only the metal cable as described above, even if the conveyor belt is usable, for example, The life of the annular conductor is shortened by deforming it into a trough shape, bending it with a pulley, or receiving an impact when a transported object is loaded, and before the life of the conveyor belt. In some cases, the annular conductor may fail. When the annular conductor breaks down, it is necessary to deal with it by replacing it with a new one at the site where the carrying work is performed.

  Accordingly, an object of the present invention is to provide a conveyor belt and an annular conductor for a conveyor belt that improve the durability of the annular conductor while preventing erroneous detection.

The conveyor belt according to the present invention is a conveyor belt in which an annular conductor for detecting damage to the conveyor belt is disposed, and the annular conductor is made of a metal portion made of a metal material and an elastic conductive material. It is characterized by comprising a stretchable conductive portion.
According to this configuration, since the stretchable conductive portion relieves stress generated in the conveyor belt, it is possible to improve durability of the annular conductor while preventing erroneous detection.

Here, in the conveyor belt of this invention, it is preferable that the said metal part and the said elastic conductive part are arranged alternately along the extension direction of the said annular conductor.
According to this configuration, by appropriately disposing the stretchable conductive portion only at a necessary position, it is possible to further improve the durability of the annular conductor while sufficiently preventing erroneous detection.

In the conveyor belt of the present invention, the stretchable conductive portion is disposed at least in a region in the annular conductor that receives a relatively strong bending stress continuously or periodically when the conveyor belt is used. Preferably it is.
According to this configuration, it is possible to further improve the durability of the annular conductor while sufficiently preventing erroneous detection.

Moreover, in the conveyor belt of this invention, it is preferable that the said elastic conductive material is conductive natural rubber.
According to this configuration, it is possible to effectively improve the durability of the annular conductor.

Moreover, in the conveyor belt of this invention, it is preferable that the metal member is intermittently arrange | positioned inside the said elastic conductive part.
According to this configuration, since the conductivity of the annular conductor can be improved, erroneous detection can be effectively prevented.

An annular conductor for a conveyor belt according to the present invention is an annular conductor for a conveyor belt for detecting damage to the conveyor belt, and a metal portion and a stretchable conductive portion are formed on the conveyor belt annular conductor. It is characterized by being alternately arranged along the extending direction.
According to this configuration, the stress generated in the conveyor belt is relieved by the stretchable conductive portion appropriately disposed only at the necessary position, so that the durability of the annular conductor can be improved while preventing erroneous detection. .

  According to the present invention, it is possible to provide a conveyor belt and an annular conductor for a conveyor belt that improve the durability of the annular conductor while preventing erroneous detection.

The whole in the use condition of the apparatus which shows the example of application to the belt conveyor apparatus of the conveyor belt which concerns on one embodiment of this invention, or the conveyor belt which has the annular conductor for conveyor belts concerning one embodiment of this invention FIG. (A) is the width direction sectional drawing of a conveyor belt which shows the conveyor belt in the conveyance area of the belt conveyor apparatus of FIG. 1 with a shape-retaining roller in the state without a conveyed product. (B) is a perspective view which shows the pulley of the belt conveyor apparatus of FIG. It is a partially cutaway view showing the conveyor belt of FIG. It is a general view which shows the annular conductor of the conveyor belt of FIG. It is a general view which shows the modification of the cyclic | annular conductor of the conveyor belt of FIG. (A), (b) is a general view which shows the annular conductor of the conveyor belt of a prior art.

DESCRIPTION OF EMBODIMENTS Hereinafter, embodiments of a conveyor belt of the present invention and an annular conductor for a conveyor belt of the present invention (hereinafter also referred to as an annular conductor) will be described in detail with reference to the drawings.
FIG. 1 shows an application example in which a conveyor belt 1 according to an embodiment of the present invention or a conveyor belt 1 having an annular conductor for a conveyor belt according to an embodiment of the present invention is applied to a belt conveyor device 2. It is a general view in the use condition of the said apparatus.
A conveyor belt 1 is mounted on a belt conveyor device 2 as shown in FIG. 1 and continuously conveys a material to be conveyed, such as minerals and earth and sand, to the downstream side. It is used to send out and transport the transported object for a short distance or a long distance. As shown in FIG. 1, the belt conveyor device 2 includes a drive pulley 21 as a power rotator located on the downstream side (side on which the conveyed product is carried out) of the device 2 and the upstream side (conveyance) of the device 2. A driven pulley 22 that is paired with the drive pulley 21 is provided, and the conveyor belt 1 is stretched between the pulleys 21 and 22. Further, in the belt conveyor device 2, a feeding chute 23 is arranged above the conveyor belt 1 near the driven pulley 22 on the upstream side thereof, and a conveyed product is thrown into the feeding chute 23, so that the conveying surface C of the conveyor belt 1 is conveyed. Placed on. Further, in the conveying section CS of the belt conveyor device 2, a shape retaining roller 24 is disposed on the inner peripheral side of the conveyor belt 1, and the conveyor belt 1 is shaped into the shape retaining roller 24 as shown in FIG. By being pressed from the inner peripheral side to become a trough shape, it is possible to prevent spillage of the loaded transported object during transport. A conveyed product is conveyed to the downstream side of the belt conveyor apparatus 2, and is carried out by the drive pulley 21 located in the downstream side. Then, after the conveyor belt 1 unloads the conveyed product by the driving pulley 21, the conveyor belt 1 moves from the downstream side to the upstream side of the belt conveyor device 2 and passes through the driven pulley 22. Is done.

  The conveyor belt 1 has an endless ring shape as shown in FIG. 1, and the cross-sectional shape in the width direction of the conveyor belt 1 is formed in a substantially rectangular shape as shown in a partially cutaway view of FIG. Further, as shown in FIG. 3, the conveyor belt 1 includes a plurality of reinforcing cords 11, a cover rubber 12 that covers the reinforcing cords 11, and the reinforcing cord 11 or the cover rubber 12 provided in the cover rubber 12. One or more annular conductors 3 for detecting damage. Further, as shown in FIG. 3, the annular conductor 3 is composed of canvas layers 13a and 13b made of a woven fabric in which warps and wefts are alternately raised and lowered (in the figure, the half layer in the width direction is omitted in the canvas layer 13b). May be disposed inside the conveyor belt 1 in a state of being sandwiched between the two.

  The cover rubber 12 of the conveyor belt 1 includes a conveyance cover rubber portion on the conveyance surface C side (lower side in FIG. 3) with respect to the reinforcing cord 11, a drive pulley 21 of the belt conveyor device 2 on the opposite side of the conveyance surface C, and the like. The inner cover rubber portion on the inner peripheral surface I side (the upper side in FIG. 3) is in contact with the inner cover surface. As shown in FIG. Since it is easy, the thickness is thicker than the inner peripheral cover rubber part. In addition, the thickness of the inner peripheral cover rubber portion can be made larger than the thickness of the transport cover rubber portion.

  The reinforcing cord 11 can be a metal cord such as a steel cord, for example, and is arranged along the longitudinal direction of the conveyor belt 1 at substantially equal intervals in the width direction as shown in FIG.

As shown in FIGS. 3 to 5, the annular conductor 3 is endlessly formed in a loop shape. The annular conductor 3 can have any shape such as a circular shape, an elliptical shape, or a rectangular shape. Further, although the annular conductor 3 has a substantially square shape in FIG. 3, the annular conductor 3 can be formed into a shape that is deformed into an 8-shape.
Further, the annular conductors 3 can be arranged in an arbitrary number in the conveyor belt 1. In FIGS. 3 to 5, the two annular conductors 3 are set as one set, not shown, but the length of the conveyor belt 1 is not shown. A plurality of sets are provided at intervals in the direction.

Here, a method for detecting a longitudinal tear of the conveyor belt 1 using the annular conductor 3 will be described. Detection of longitudinal tearing of the conveyor belt 1 is performed using electromagnetic induction. Specifically, for example, one side in the width direction of the conveyor belt 1 at a predetermined position of the conveying section CS shown in FIG. 1 of the belt conveyor device 2 to which the conveyor belt 1 having the annular conductor 3 disposed therein is mounted. A magnetic body capable of generating an induced current with respect to the annular conductor 3 such as a magnet is arranged on the inner peripheral surface I side of the outer portion on the side, and the inner side of the outer portion on the other side in the width direction of the conveyor belt 1 A sensor capable of sensing when the annular conductor 3 generates an induced current is disposed on the peripheral surface I side. When there is no abnormality in the conveyor belt 1, an induced current is generated in the annular conductor 3, so that the sensor detects the induced current and the user of the belt conveyor device 2 has no problem with the conveyor belt 1. Can be recognized. In addition, for example, when a vertical tear occurs in the conveyor belt 1, the annular conductor 3 is disconnected and no induced current is generated. Therefore, the sensor detects that no induced current is generated and is used. A person can recognize that a problem has occurred in the conveyor belt 1.
In the conventional conveyor belt, two annular conductors made of straight metal wires are used as the annular conductor as described above, as shown in FIG. 6 (a), or FIG. 6 (b). As shown in FIG. 2, two annular conductors having a ring shape as a whole are used while meandering a metal wire.

  Incidentally, in the belt conveyor device 2, as described above, the conveyor belt continuously travels between the driven pulley 22 and the drive pulley 21, becomes a trough shape in the transport section CS, and in each pulley 21, 22. Bending and deforming cause stress inside. In addition, an impact may be applied when a transported object is loaded. Therefore, as shown in FIG. 6, when an annular conductor made of a metal wire is used as a detection object for detecting a vertical tear, the metal wire has low durability against such bending deformation and impact. The annular conductor 4 may fail before the life of the belt.

Therefore, in the conveyor belt 1, the annular conductor 3 includes a metal portion 3a made of a metal material and a stretchable conductive portion 3b made of a stretchable conductive material.
According to this configuration, the stretchable conductive portion 3b relieves the stress generated in the conveyor belt 1 and the above-described impact as compared with the case where the annular conductor 3 includes only the metal portion 3a. Durability can be improved. In addition, since the electrical resistance does not increase excessively as compared with the case where the annular conductor 3 is composed only of the stretchable conductive portion 3b, a sufficient induced current can be generated in the annular conductor 3, and noise or the like can be generated. This can be detected by the sensor without being affected, and erroneous detection can be prevented.

Here, the metal part 3a can be formed using, for example, an arbitrary metal material in a wire shape or a sheet shape.
The stretchable conductive portion 3b is made of, for example, a conductive material such as natural rubber, BR (polybutadiene rubber), SBR (styrene butadiene rubber), NBR (acrylonitrile butadiene rubber), or a mixture thereof. Further, it can be composed of a conductive powder such as carbon or metal, or a stretchable conductive material containing conductive fibers such as carbon.
The stretchable conductive material is preferably a conductive natural rubber containing a conductive material. Since natural rubber is excellent in stretchability and has good adhesion to other members by vulcanization of natural rubber, the stretchable conductive portion 3b sufficiently relaxes the stress generated in the conveyor belt 1, and the annular conductor It is because durability of 3 can be improved effectively.

By the way, as for the cyclic | annular conductor 3, as shown to FIGS. 3-5, it is preferable that the metal part 3a and the elastic | stretch conductive part 3b are arranged alternately along the extension direction of the cyclic | annular conductor 3. As shown in FIG. Specifically, as shown in the drawing, the annular conductor 3 is connected to the metal portion 3a having a certain length along the extending direction of the annular conductor 3, and to a certain length by being connected to the metal portion 3a. Stretchable conductive portions 3b having a length are alternately and repeatedly arranged. According to this configuration, for example, by appropriately disposing the stretchable conductive portion 3b only at a necessary position, the durability of the annular conductor 3 can be further improved while sufficiently preventing erroneous detection.
In FIG. 3, the wire-like metal portion 3 a is meandered and extended, but it may be straight.

The annular conductor 3 can be manufactured by an arbitrary method. For example, the metal part 3a and the stretchable conductive part 3b can be connected to a raw rubber containing a conductive material and a part of the metal part 3a. Can be produced by placing in a mold and vulcanizing.
The stretchable conductive portion 3b preferably has an electrical resistivity of 100 Ω · cm or less, and according to this, erroneous detection can be prevented more reliably and longitudinal tear detection can be performed satisfactorily.

Here, as described above, the conveyor belt 1 is mounted on the belt conveyor device 2 and continuously used. Therefore, when the conveyor belt 1 is used, the annular conductor 3 is deformed into a trough shape as shown in FIG. 2A in the transport section CS, or each pulley 21 as shown in FIG. , 22 tends to be subjected to stress relatively continuously or periodically, for example, in the next region. That is, in the trough part of the conveyor belt 1, since the conveyor belt 1 is relatively easily bent at the BP between the parts pressed by the shape-retaining roller 24 shown in FIG. The region R1 (FIG. 4) of the conductor 3 is relatively strongly subjected to bending stress. When the conveyor belt 1 passes through the pulleys 21 and 22, as shown in FIG. 2B, the conveyor belt 1 is bent and deformed while being stretched in the longitudinal direction. The region R2 (FIG. 4) of the body 3 is relatively strongly subjected to bending stress.
Therefore, it is preferable that the stretchable conductive portion 3b is disposed at least in the region R1 and / or R2 of the annular conductor 3 that receives a relatively strong bending stress. According to this configuration, the bending stress can be efficiently relaxed while preventing an excessive increase in electrical resistance, so that the durability of the annular conductor 3 can be further improved while sufficiently preventing erroneous detection.
In the annular conductor 3 shown in FIG. 4, the stretchable conductive portion 3b is disposed beyond the regions R1 and R2, but at least a part of the stretchable conductive portion 3b is disposed in the region R1 or R2. The stretchable conductive portion 3b is preferably disposed beyond the regions R1 and R2 from the viewpoint of durability of the annular conductor 3.

  The region R1 in the annular conductor 3 is a position in the conveyor belt 1 corresponding to 1/8 to 3/8 of the width of the conveyor belt 1 as measured from the center of the conveyor belt 1 toward the outside in the width direction. It is. In addition, the region R2 in the annular conductor 3 is a region that receives a relatively strong bending stress by bending and deforming the conveyor belt 1 while being stretched in the longitudinal direction thereof. , Located at a portion along the longitudinal direction of the conveyor belt.

  Moreover, as shown in FIG. 5, it is preferable that the elastic member 3b has the metal member 3c intermittently disposed therein. In other words, for example, any wire-like short metal member 3c or sheet-like short metal member 3c is provided in the stretchable conductive portion 3b along the extending direction of the annular conductor 3, as illustrated. Are arranged at intervals. According to this configuration, since the metal member 3c is intermittently disposed, the conductivity of the annular conductor 3 can be improved without affecting the stretchability of the stretchable conductive portion 3b. Detection can be effectively prevented.

  In the above-described embodiment, the example in which the annular conductor 3 is used as a detection target for detecting the longitudinal tear damage of the conveyor belt 1 has been shown. It can also be used as an object to be detected for detecting damage.

  As mentioned above, although embodiment of this invention was described with reference to drawings, the conveyor belt of this invention and the cyclic | annular conductor for conveyor belts of this invention are not limited to the said example, Implementation of above-described this invention The form can be appropriately changed.

  ADVANTAGE OF THE INVENTION According to this invention, the cyclic | annular conductor for conveyor belts and conveyor belts which improved durability of the cyclic | annular conductor can be provided, preventing a misdetection.

DESCRIPTION OF SYMBOLS 1 Conveyor belt 11 Reinforcement cord 12 Cover rubber 13a, 13b Canvas layer 2 Belt conveyor device 21 Drive pulley 22 Driven pulley 23 Input chute 24 Shape-retaining roller 3 Ring conductor 3a Metal part 3b Stretch conductive part 3c Metal member 4 Ring conductor BP Between parts pressed by the shape-retaining rollers C Conveying surface CS Conveying section I Inner peripheral surface R1, R2 region

Claims (6)

A conveyor belt having an annular conductor for detecting damage to the conveyor belt disposed therein,
A conveyor belt, wherein the annular conductor includes a metal portion made of a metal material and a stretchable conductive portion made of a stretchable conductive material.   The conveyor belt according to claim 1, wherein the metal portions and the stretchable conductive portions are alternately arranged along the extending direction of the annular conductor.   The stretchable conductive portion is disposed at least in a region in the annular conductor that receives a relatively strong bending stress continuously or periodically during use of the conveyor belt. Conveyor belt.   The conveyor belt according to claim 1, wherein the stretchable conductive material is a conductive natural rubber.   The conveyor belt according to any one of claims 1 to 4, wherein a metal member is intermittently disposed inside the stretchable conductive portion. An annular conductor for a conveyor belt for detecting conveyor belt damage,
An annular conductor for a conveyor belt, wherein metal portions and stretchable conductive portions are alternately arranged along the extending direction of the annular conductor for a conveyor belt.

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