JP2012224471A - Conveyor belt and conveyor device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a conveyor belt with which while the cost of the conveyor belt can be kept low, longitudinal tear can be precisely detected and the longitudinal tear can be detected before the growth of the longitudinal tear.SOLUTION: In an endless circular conveyor belt 22, a loop coil 26 (26A, 26B, 26C, and so on), in which induced current flows by receiving high frequency is embedded. The loop coil 26 (26C, 26D, 26E, and so on) is disposed extending from the center of the width direction outwardly, and is embedded with a specific interval in a zigzag form in a running direction.

Description

  The present invention relates to a conveyor belt and a conveyor device, and more particularly, to a conveyor belt and a conveyor device that can detect a vertical tear that occurs during conveyance of an object to be conveyed.

  In the part where the material to be transported is loaded on the conveyor belt, if a large block of material is jammed between the belt and the hopper or if a sharp material is stuck, the surface of the belt is rubbed strongly by the material to be conveyed. Continuing, it may eventually lead to the failure of the conveyor belt torn longitudinally. When this occurs, the entire circumference of the conveyor belt is torn and falls into a state where it cannot be transported, and the transported material diffuses to the periphery, which may cause serious damage. In addition, in natural resource mining sites and the like, it is difficult to find such a failure, and it may take time to perform maintenance and repair, so a method for automatically detecting the failure has been demanded.

  Therefore, as a method for automatically detecting a sign of all-around longitudinal tearing (minimizing the distance for longitudinal tearing) in advance, as shown in FIG. As shown in the sectional view of FIG. 1B, a set of high-frequency transmitters 8A and a receiver 8B are disposed below the conveyor belt 2 as shown in the sectional view of FIG. Thus, there has been proposed a method of detecting a disconnection / non-disconnection of the loop coil 6 in a non-contact manner and sending a stop signal to the system if the disconnection is detected (see Patent Documents 1 and 2).

JP 51-055575 A JP 2005-162430 A

  However, in the above-described vertical tear detection method, if the accuracy of longitudinal tear detection is increased and an attempt is made to quickly detect a longitudinal tear before the growth of the longitudinal tear progresses, a loop as shown in FIG. The insertion interval of the coil 6 must be shortened. If the interval between the coils is shortened, the total amount of coils to be inserted increases, which causes a problem that the conveyor belt becomes expensive.

  The present invention has been made in view of such problems, and the object of the present invention is to reduce the total amount of coils and reduce the cost of the conveyor belt, and to detect longitudinal tears with high accuracy. It is an object of the present invention to provide a conveyor belt and a conveyor device that can detect a longitudinal tear before the growth of the longitudinal tear progresses.

  In order to achieve the above object, the first invention is an endless annular conveyor belt in which a loop coil through which an induced current flows by receiving a high frequency is embedded, and the loop coil extends from a central portion in the conveyor belt width direction. It is arranged to extend outward, and a plurality of them are embedded at predetermined intervals in a staggered manner in the traveling direction so that the outer portions alternate.

  2nd invention is a conveyor apparatus carrying the conveyor belt of 1st invention, Comprising: The high frequency is supplied to the said loop coil arrange | positioned in the conveyor belt width direction center part in the vicinity of the said conveyor belt A transmitter, first and second receivers that are arranged in the width direction of the conveyor belt on both sides of the transmitter, and alternately detect the induced current due to the high frequency from the loop coil, and the loop coil is the first And determining means for determining a disconnection state of the loop coil based on signals from the first and second receivers when passing through the first and second receivers.

  According to the first invention, while reducing the total amount of the coil related to the cost of the conveyor belt, the density of the coil is increased in the central portion in the width direction of the belt where vertical tearing is likely to occur. Longitudinal cracks can be detected with high accuracy and can be detected quickly before the growth of longitudinal tears has progressed.

  According to the second invention, the transmitter for supplying a high frequency to the loop coil is disposed in the central portion of the conveyor belt in the width direction, and the first and second that alternately detect the induction current of the loop coil on both sides of the transmitter. Therefore, when the loop coil passes through the first and second receivers, the disconnection state of the loop coil can be determined.

It is a figure which shows the conveyor belt by which the loop coil for a longitudinal tear detection was embed | buried. It is a figure which shows the conveyor belt by which the loop coil was embedded by shortening a space | interval, in order to detect a longitudinal tear accurately. It is a figure which shows an example of a structure of the conveyor apparatus carrying the conveyor belt and conveyor belt of this invention. It is a perspective view which shows a drive pulley and a proximity sensor. It is a figure explaining a loop coil and a vertical tear detection sensor. It is sectional drawing of a conveyor apparatus. It is a timing chart of various signals at the time of operation.

  Embodiments of the present invention will be described with reference to the drawings. FIG. 3 is a diagram showing an example of the configuration of the conveyor belt of the present invention and a conveyor device equipped with the conveyor belt. As shown in FIG. 3, the conveyor device 10 is provided with a drive pulley 12 as a power rotator, and a driven pulley 14 that is paired with the drive pulley 12 is provided. The drive pulley 12 and the driven pulley 14 include An endless annular rubber conveyor belt 22 is wound around. In addition, a hopper 24 is disposed above the conveyor belt 22, and an object to be conveyed is supplied from the hopper 24 onto the conveyor belt 22. A motor (not shown) is connected to the drive pulley 12 via a gear so as to be rotated. In FIG. 3, C represents the traveling direction of the conveyor belt.

  The conveyor device 10 includes a pulley rotation sensor that outputs a signal for each predetermined rotation angle when the driving pulley 12 that drives the conveyor belt 22 or the driven pulley 14 that is driven by the conveyor belt 22 rotates. The first proximity sensor 20A and the second proximity sensor 20B will be described next as examples of sensor components.

  FIG. 4 is a perspective view showing a drive pulley and a proximity sensor. One or more (two in the illustrated case) iron pieces 16 serving as detection metals are attached to the side surface 12A of the drive pulley 12. A rotation sensor support frame 18 is disposed in the vicinity of the side surface 12A of the drive pulley 12, and two proximity sensors (a first proximity sensor 20A and a second proximity sensor 20B) are provided on the rotation sensor support frame 18 as a drive pulley. It is fixed on the same arc centered on 12 axes with a slight gap. A CPU 35 is connected to the first proximity sensor 20 </ b> A and the second proximity sensor 20 </ b> B via an amplifying unit (not shown). The first proximity sensor 20 </ b> A and the second proximity sensor 20 </ b> B are provided with the iron piece 16 by the rotation of the drive pulley 12. Each time it passes through the first proximity sensor 20A and the second proximity sensor 20B, a pulse signal is output to the CPU 35. The first proximity sensor 20A and the second proximity sensor 20B are arranged so as to be shifted on the same arc, and the rotation direction of the drive pulley 12 can be determined.

  Here, the rotation amount of the drive pulley 12 and the travel distance of the conveyor belt 22 substantially correspond to each other except for the deviation between the drive pulley 12 and the conveyor belt 22, so the first and second proximity sensors 20 </ b> A and 20 </ b> B send to the CPU 35. The number of output pulse signals also substantially corresponds to the travel distance of the conveyor belt 22.

  Furthermore, a plurality of loop coils 26 (26A, 26B, 26C, 26C, 26C, 26C, 26C, 26C, 26C, 26C, and 26C are arranged in the conveyor device 10 at intervals in the traveling direction (length direction) of the conveyor belt 22 and hold information on the presence or absence of vertical tearing. 26D, 26E..., And a vertical position where the information is taken out from the loop coil 26 which is fixedly arranged near the conveyor belt 22 and passes through the detection area as the conveyor belt 22 rolls, and the information is output in real time. A tear detection sensor 28 is provided. Next, the loop coil 26 and the vertical tear detection sensor 28 will be described.

  FIG. 5 is a diagram illustrating a loop coil and a vertical tear detection sensor. Inside the conveyor belt 22 (inside the rubber near the lower surface), a loop coil 26 (26A, 26B, 26C, 26D, 26E...) Of a thin twisted galvanized steel wire extends outward from the center in the conveyor belt width direction. It extends and is staggered in the direction of travel so that the outer sides alternate, and is embedded at predetermined intervals. Longitudinal tearing of the conveyor belt is likely to occur at the center of the belt that conveys the object to be transported, so this arrangement shortens the distance between the loop coils in the center and lengthens the distance between the loop coils at the ends that are relatively difficult to tear. Thus, the presence or absence of longitudinal tearing can be intensively detected at a portion where longitudinal tearing may occur. The loop coil 26 is composed of two steel cables arranged concentrically, and a long side of the loop coil 26 forms a substantially rectangular closed loop extending about 2/3 of the entire width of the conveyor belt 22 with a conductive wire. For these loop coils 26, low-strength conducting wires that are always disconnected when the conveyor belt 22 is longitudinally split are used.

  The two loop coils 26A and 26B that are embedded close to each other (with a distance of 5 m in this embodiment) are used as start loop coils and are used as a reference for calculating the belt travel distance. In this embodiment, each of the loop coils 26C, 26D, 26E,... Following the start loop coil 26B is arranged so that the distance is 25 to 50 m so that the moving distance from the start loop coil 26A can be detected. ing. The number and interval of the loop coils 26 can be variously set.

  As shown in FIGS. 3 and 5, a vertical tear detection sensor 28 is fixedly arranged below the vicinity of the conveyor belt 22. The vertical tear detection sensor 28 is preferably disposed corresponding to the position where the vertical tearing of the conveyor belt 22 is likely to occur. In this embodiment, as shown in FIG. Are arranged corresponding to positions slightly shifted in the direction of travel (in the direction of arrow C).

  FIG. 6 is a cross-sectional view of the conveyor device at a position where the vertical tear detection sensor is disposed. The vertical tear detection sensor 28 includes a transmitter 28A, a first receiver 28B, and a second receiver 28C. The transmitter 28A is disposed in the center in the width direction below the conveyor belt 22, and the transmitter 28A. The first receiver 28B and the second receiver 28C are arranged on both sides of the receiver. The transmitter 28A emits a high frequency (for example, about 11 kHz) and supplies a high frequency to the loop coil 26 when the loop coil 26 passes through. Here, if the passing loop coil 26 is not disconnected, electromagnetic induction is generated by the high frequency from the transmitter 28A, an induced current flows through the loop coil 26, and the first receiver 28B and the second receiver 28C are alternately connected. Each of the induced currents can be detected. A CPU 35 (determination means) is connected to the longitudinal tearing detection sensor 28 via an amplifying unit (not shown) for output.

  The conveyor device 10 is further provided with a CPU 35 (determination means) and a memory 38. The CPU 35 stores the number of pulses from the first proximity sensor 20A and the second proximity sensor 20B based on the program stored in the memory 38, and the pulse signals from the first and second proximity sensors 20A and 20B and longitudinal tearing. The presence / absence of the longitudinal tear of the conveyor belt 22 and the position thereof are determined based on the signal from the detection sensor 28. A drive control unit 40 is connected to the CPU 35, and a signal is output from the CPU 35 to the drive control unit 40 when it is determined that there is a longitudinal tear of the conveyor belt 22, whereby a motor that drives the drive pulley 12. (Not shown) is adapted to stop the longitudinal tearing portion at a predetermined position.

  Next, detection of longitudinal tearing of the conveyor belt 22 in the conveyor device 10 will be described with reference to FIGS. 3, 5, and 7.

  First, in order to memorize | store each space | interval of the loop coils 26A-26P shown by FIG. 3, the conveyor apparatus 10 is drive | operated. FIG. 7 shows a timing chart of various signals during operation. Here, the rotation sensor signal V1 is a pulse signal input from the first proximity sensor 20A, and the rotation sensor signal V2 is a pulse input from the second proximity sensor 20B with a predetermined time delay from the rotation sensor signal V1. Signal. The loop coil signal V3 is obtained by amplifying a signal from the first receiver 28B by an amplifying unit (not shown) and input to the CPU 35. The loop coil signal V4 is shown by a signal from the second receiver 28C. The signal is amplified by the amplifying unit that is not input and is input to the CPU 35.

  In the loop coil signal V3 of FIG. 7, pulse signals 326A and 326B generated substantially continuously indicate that the first receiver 28B shown in FIG. 5 has detected the two loop coils 26A and 26B substantially continuously. The two loop coils 26A and 26B are recognized as start loop coils. After detection of the start loop coils 26A and 26B, the CPU 35 generates a rotation sensor signal V1 and a pulse signal (326C, 326E, 326C, 326G,...) Each time a coil detection signal is generated in the loop coil signal V3. The number of pulses input by the rotation sensor signal V2 is stored as an interval between the loop coils (26A, 26B, 26C, 26E...). The first receiver 28B again detects the two loop coils (start loop coils) 26A and 26B almost continuously again, and the pulse signals 326A and 326B are continuously generated again in the loop coil signal V3 shown in FIG. At this stage, the CPU 35 determines that the conveyor belt 22 has made a full turn, and finishes storing the intervals between the loop coils (26A, 26B, 26C, 26E,...).

  Further, the CPU 35 determines the interval between the loop coils (26A, 26B, 26C, 26E,...) Based on the pulse signals (326A, 326B, 326C, 326E, 326G,...) From the first receiver 28B. In parallel with the memory, similarly, between each loop coil (26A, 26B, 26D, 26F...) Based on the pulse signal (426A, 426B, 426D, 426F, 426H...) From the second receiver 28C. The interval is stored.

  Next, detection of longitudinal tearing of the conveyor belt 22 is started. Vertical tear detection is performed based on the first receiver 28B and the second receiver 28C. The loop coil 26C shown in FIG. 5 passes through the first receiver 28B.

  In longitudinal split detection of the loop coil 26C based on the first receiver 28B, first, the CPU 35 uses the rotation sensor signal V1 and the rotation sensor signal V2 after the input of the start loop coil pulse signals 326A and 326B shown in FIG. Count the number of pulses generated. When the counted number of pulses and the number stored as the number of pulses up to the embedded portion of the loop coil 26C are made to correspond to each other, and they are equal, the pulse signal shown in FIG. Signal) The presence or absence of 326C is determined. Here, if there is a pulse signal (coil detection signal) 326C, it is determined that no vertical tear has occurred in the embedded portion of the loop coil 26C shown in FIG. On the other hand, if there is no pulse signal (coil detection signal) 326C, it is determined that the loop coil 26C is broken (in a disconnected state) due to the longitudinal tearing at the place where the loop coil 26C is buried, and a signal is sent to the drive control unit 40. Is output to stop driving of the drive pulley 12.

  In longitudinal split detection of the loop coil 26D based on the second receiver 28C, first, the CPU 35 uses the rotation sensor signal V1 and the rotation sensor signal V2 after the input of the pulse signals 426A and 426B of the start loop coil shown in FIG. Count the number of pulses generated. When the counted number of pulses and the number stored as the number of pulses up to the embedded position of the loop coil 26D are made to correspond to each other, and they are equal, the pulse signal shown in FIG. Signal) 426D is determined. Here, if there is a pulse signal (coil detection signal) 426D, it is determined that no vertical tear has occurred at the embedded portion of the loop coil 26D shown in FIG. On the other hand, if there is no pulse signal (coil detection signal) 426D, it is determined that the loop coil 26D is broken (in a disconnected state) due to a longitudinal tear at the buried portion of the loop coil 26D, and a signal is sent to the drive control unit 40. Is output to stop driving of the drive pulley 12.

  Hereinafter, similarly, the first receiver 28B detects the presence or absence of vertical tearing at the buried portion based on the presence or absence of detection of the pulse signal at the coil position of the loop coil (26E, 26G...), And the second receiver 28C The presence or absence of occurrence of vertical tearing at the buried portion is detected based on whether or not the pulse signal is detected at the coil position of the loop coil (26F, 26H...).

  In the above embodiment, the travel distance of the conveyor belt 22 is estimated by the first and second proximity sensors 20A and 20B, but the travel distance of the conveyor belt 22 may be estimated by a timer. Further, the iron piece 16 is attached to the side surface of the driven pulley 14 instead of the side surface of the driving pulley 12A, and the first and second proximity sensors 20A and 20B are not positioned near the side surface of the driving pulley 12A but near the side surface of the driven pulley 14. It may be provided.

  Further, when both the first receiver 28B and the second receiver 28C detect the loop coil 26, a third pulse signal is separately generated, and the generated pulse signal and the first and second proximity sensors 20A are generated. , 20B may be compared with the pulse signal.

  Further, the loop coil signals V3 and V4 based on the first and second receivers 28B and 28C are compared and processed to generate a third pulse signal, and the generated pulse signal and the first and second proximity signals are generated. The determination may be made by comparing the pulse signals of the sensors 20A and 20B.

  As described above, according to the present invention, since the loop coil is staggered in the running direction so that the outer portions of the loop coil alternate and embedded in the conveyor belt, the total amount of the coil can be reduced, and therefore the conveyor belt. The cost can be kept low. In the present invention, since the density of the coil is increased at the central portion in the width direction of the belt where the vertical tear is likely to occur, the longitudinal tear can be detected with high accuracy and the longitudinal tear is not progressed. Can be discovered quickly.

DESCRIPTION OF SYMBOLS 10 Conveyor apparatus 12 Drive pulley 12A Drive pulley side surface 14 Driven pulley 16 Iron piece 18 Rotation sensor support frame 20A 1st proximity sensor 20B 2nd proximity sensor 22 Conveyor belt 24 Hopper 26, 26A-26P Loop coil 28 Vertical tear detection sensor 28A Transmitter 28B 1st receiver 28C 2nd receiver 35 CPU
38 Memory 40 Drive controller

Claims (2)

An endless annular conveyor belt in which a loop coil through which an induction current flows by receiving a high frequency is embedded,
The said loop coil is extended and arrange | positioned outside from the center part in the width direction of a conveyor belt, The conveyor belt characterized by being staggered in the running direction so that an outer side may alternate, and being embedded with two or more by predetermined intervals. A conveyor device on which the conveyor belt according to claim 1 is mounted,
In the vicinity of the conveyor belt, a transmitter that is arranged at the center in the conveyor belt width direction and that supplies a high frequency to the loop coil that passes through,
First and second receivers that are arranged in the conveyor belt width direction on both sides of the transmitter and that alternately detect the induced current due to the high frequency from the loop coil;
Determining means for determining a disconnection state of the loop coil based on signals from the first and second receivers when the loop coil passes through the first and second receivers;
A conveyor device comprising:

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