Belt speed measuring system

Abstract

To provide a belt speed measuring system capable of directly measuring belt speed.SOLUTION: A belt speed measuring system includes: a belt that is wound around a pulley and rotates; a single RFID tag provided on the belt, or a plurality of RFID tags provided at predetermined intervals along the length of the belt; a reading device that communicates with the RFID tags to acquire tag information; a storage device that stores length information related to the circumference of the belt or the intervals; and a processing device that calculates speed of the belt. The reading device is configured to transmit time information regarding a time point of communication with the RFID tag to the processing device and the processing device is configured to calculate speed of the belt based on the length information and the time information.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present invention relates to a belt speed measurement system. [Background technology]

[0002] 2. Description of the Related Art Conventionally, the speed of a conveyor belt in a conveying device or a transmission belt in a transmission device has been measured. The speed of the belt can be used as an index for determining whether the device is operating normally.

[0003] A well-known measurement method, as described in Patent Document 1, is to convert the number of revolutions of a drive pulley for driving a belt into the belt speed.

[0004] Also, a method using a magnetic sensor is known, as described in Patent Document 2. Specifically, Patent Document 2 proposes using a plurality of magnet members embedded in the belt at predetermined intervals in the belt length direction and a magnetic sensor that detects the magnetic fields of the magnet members, and measuring the belt speed based on the interval between the magnet members and the difference in time at which each magnet member is detected by the magnetic sensor. [Prior art documents] [Patent documents]

[0005] [Patent Document 1] JP 2016-60556 A [Patent Document 2] JP 2018-47973 A Summary of the Invention [Problem to be solved by the invention]

[0006] The method of Patent Document 1 is classified as a method of indirectly measuring the belt speed. On the other hand, the method of Patent Document 2 is classified as a method of directly measuring the belt speed. Of these, the directly measured belt speed can be a useful index for determining whether the device is operating normally. Specifically, in friction transmission, when the belt runs, a tension difference occurs between the tight side and the slack side via the pulley. This tension difference causes elastic slip (creep) in the belt, so the belt speed does not strictly correspond to the rotation speed of the pulley. In other words, the belt speed calculated by converting it from the rotation speed of the pulley deviates from the actual belt speed. Therefore, in order to know the belt speed as accurately as possible, it can be said that it is preferable to measure the speed of the belt itself.

[0007] As a more specific issue, since the speed of the conveyor belt in the conveying device is a guideline for achieving the desired conveying amount, it is desirable to grasp the accurate value. Also, if it is possible to know that the speed of the conveyor belt is decreasing, it is possible to adjust the conveying amount so as not to cause overloading, thereby suppressing overloading of the device.

[0008] Next, the magnetic sensor used in Patent Document 2 can detect the magnetic field of the magnet member when it is close to the magnet member, but detection may become difficult when it is too far away from the magnet member. For this reason, the magnetic sensor has a problem that it is difficult to apply to conveyance devices and transmission devices that are expected to have a variety of specifications such as size.

[0009] In view of the above circumstances, an object of the present invention is to provide a belt speed measuring system that can directly measure the belt speed and is applicable to many devices such as conveying devices and transmission devices. [Means for solving the problem]

[0010] The belt speed measurement system of the present invention comprises: A belt that is wound around a pulley and rotates. one RFID tag provided on the belt, or multiple RFID tags provided at predetermined intervals along the length of the belt; A reader that communicates with the RFID tag to acquire tag information; A storage device that stores length information regarding the circumference of the belt or the interval; a processor for calculating a speed of the belt; The reader is configured to transmit time information regarding a time point of communication with the RFID tag to the processor; The processor is configured to calculate a speed of the belt based on the length information and the time information.

[0011] According to the above aspect, the processing device calculates the belt speed based on belt length information based on the RFID tag attached to the belt and time information related to the time of communication between the reader and the RFID tag, so that the belt speed can be obtained directly. Also, the radio waves emitted by the RFID tag can be received by a reader placed close to the RFID tag, and can also be received by a reader placed farther away. Therefore, the above aspect can be applied to many devices.

[0012] In addition, a belt speed measurement system according to an aspect of the present invention includes: the plurality of RFID tags have unique identification codes; The storage device stores the identification code and the length information in association with each other.

[0013] According to the above aspect, since the unique identification code and length information of each RFID tag are associated in the storage device, it is possible to know whether a detection error has occurred in any of the RFID tags. Then, by knowing the detection error, the processing device can take into account the loss of time information caused by the detection error, which can contribute to a relatively accurate calculation of the belt speed.

[0014] In addition, a belt speed measurement system according to an aspect of the present invention includes: When the processing device determines that the arbitrary identification code of an RFID tag transmitted from the reading device at any time is an identification code of an RFID tag that is not adjacent to the previous identification code transmitted from the reading device immediately before the previous identification code, the processing device calculates the speed of the belt based on the length information and time information of the RFID tags corresponding to the previous identification code and the arbitrary identification code, respectively.

[0015] In the above aspect, when a detection error occurs in an RFID tag placed between an RFID tag having a previous identification code and an RFID tag having an arbitrary identification code, the belt speed is calculated based on the length information and time information corresponding to the previous identification code and the arbitrary identification code, respectively, and the calculated belt speed is designed to deviate as little as possible from the actual belt speed. Therefore, according to the above aspect, it is possible to calculate a relatively accurate belt speed.

[0016] In addition, a belt speed measurement system according to an aspect of the present invention includes: The belt is wound around a take-up pulley, The length information in the storage device is configured to be modified in response to stretching of the belt by the take-up pulley.

[0017] According to this configuration, the length information is corrected according to the stretching of the belt caused by the take-up pulley, so that the belt speed can be calculated more accurately. Effect of the Invention

[0018] As described above, according to the present invention, it is possible to provide a belt speed measuring system capable of directly measuring the speed of a belt. [Brief description of the drawings]

[0019] [Figure 1] FIG. 1 is a schematic diagram of a belt velocity measurement system according to an embodiment. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0020] DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, a belt speed measurement system according to an embodiment of the present invention will be described with reference to the drawings, by illustrating an embodiment in which the speed of a conveyor belt in a conveying device is measured.

[0021] As shown in FIG. 1, the belt speed measuring system 1 of this embodiment includes a conveyor belt 10, a plurality of pulleys 20 for rotating the conveyor belt 10, a plurality of RFID tags 30 arranged at a predetermined interval L along the length of the conveyor belt 10, a reading device 40 for communicating with each RFID tag 30 to acquire tag information, a storage device 50 for storing length information regarding the interval L formed for the circumference of the conveyor belt 10 or the number of RFID tags 30, and a processing device 60 for calculating the speed of the conveyor belt 10.

[0022] The conveyor belt 10 of this embodiment is formed in a belt-like shape by joining one or more belt-like belt members. The conveyor belt 10 has one or more joints formed by joining the belt members. The conveyor belt 10 has an inner circumferential surface that contacts the pulley 20 when wrapped around the pulley 20, and a transport surface that is an outer circumferential surface on the opposite side to the inner circumferential surface. The conveyor belt 10 has a core layer, a first rubber layer that covers the core layer from the inner circumferential surface side, and a second rubber layer that covers the core layer from the outer circumferential surface side.

[0023] The core layer is made of canvas or a cord. The canvas is preferably made of fiber. The cord may be made of fiber such as chemical fiber or carbon fiber, or may be made of metal such as steel cord.

[0024] The first rubber layer and the second rubber layer are made of a rubber composition. Examples of the rubber components of the rubber composition include natural rubber (NR), butadiene rubber (BR), styrene-butadiene rubber (SBR), ethylene-propylene rubber (EPR), ethylene-propylene-diene rubber (EPDM), isoprene rubber (IR), acrylonitrile-butadiene rubber (NBR), hydrogenated nitrile rubber (HNBR), isobutylene-isoprene rubber (IIR), chloroprene rubber (CR), chlorosulfonated polyethylene rubber (CSM), chlorinated butyl rubber (CIIR), brominated butyl rubber (BIIR), silicone rubber (SR), urethane rubber (UR), acrylic rubber (ACR), and fluororubber (FR). The rubber composition may contain only one type of rubber component, or may contain multiple types of rubber components.

[0025] The rubber composition may contain components other than the rubber component, such as fillers such as carbon black, silica, calcium carbonate, flame retardants such as ethylene bistetrabromophthalimide, crosslinking agents such as sulfur, organic peroxides, vulcanization accelerators such as zinc oxide, plasticizers such as dioctyl adipate, hardness regulators such as paraffin oil, antioxidants such as benzimidazole compounds, and lubricants such as stearic acid.

[0026] The multiple pulleys 20 in this embodiment include a drive pulley 21 connected to a motor, a driven pulley 22 that rotates by the power of the drive pulley 21 transmitted through the conveyor belt 10, and a take-up pulley 23 for applying tension to the conveyor belt 10.

[0027] The take-up pulley 23 is configured to apply a tension to the conveyor belt 10 to stretch it in the length direction, thereby reducing slack in the conveyor belt 10. Specifically, the take-up pulley 23 is configured to apply a predetermined tension to the conveyor belt 10 so that slack does not occur in the conveyor belt 10 when the conveyor belt 10 is wound around the pulley 20 (for example, immediately after the belt is replaced) or from the time when the conveyor belt 10 is wound around the pulley 20 to a second time when a certain amount of time has passed since the first time when the belt is wound around the pulley 20 and the end of the break-in period (initial period of use). The circumference of the conveyor belt 10 can change over the course of use from the time when the conveyor belt 10 is wound around the pulley 20. In more detail, first, the circumference of the conveyor belt 10 when the conveyor belt 10 is wound around the pulley 20 changes to the circumference at the first time when the belt is wound around the pulley 20 and the initial stretch caused by the break-in period is added (initial period of use). Next, the first circumference at the first time point changes to a second circumference (longer than the first circumference) that is elongated due to use from the first time point to the second time point. Hereinafter, the difference between the first circumference and the second circumference is defined as D. The difference D is calculated based on the amount of change in the position of the shaft of the take-up pulley 23 at the second time point relative to the position of the shaft of the take-up pulley 23 at the first time point. More specifically, the difference D is twice the moving distance d of the shaft of the take-up pulley 23 at the second time point relative to the position of the shaft of the take-up pulley 23 at the first time point.

[0028] The second point in time may be, for example, a point in time that is three months or more after the first point in time, a point in time that is four months or more after the first point in time, a point in time that is five months or more after the first point in time, or a point in time that is six months or more after the first point in time.

[0029] Each RFID tag 30 of this embodiment has a memory, and stores a unique identification code C in the memory. That is, each RFID tag 30 of this embodiment has a different identification code C. Each RFID tag 30 of this embodiment is configured to receive radio waves transmitted from a reading device 40, convert information such as the identification code stored in the memory into a signal, and transmit the signal to the reading device 40. The RFID tag 30 of this embodiment is a passive type.

[0030] Each RFID tag 30 is embedded in the second rubber layer of the conveyor belt 10. Each RFID tag 30 is provided so that the distance from the pitch line of the conveyor belt 10 is almost constant. The deviation of the distance of each RFID tag 30 from the pitch line with respect to the average distance is preferably within 10%, more preferably within 5%. This can reduce the difference in communication time between each RFID tag 30 and the reader 40. More preferably, each RFID tag 30 is provided on the pitch line, which can suppress damage caused by the expansion and contraction deformation of the second rubber layer during running. The distance between the RFID tag 30 and the pitch line is the length of a line segment drawn perpendicularly from the center of the RFID tag 30 toward the pitch line.

[0031] In this embodiment, the intervals L defined by each RFID tag 30 are different from each other. To explain this in detail, when the RFID tag 30 is embedded in the conveyor belt 10 as in this embodiment, even if the RFID tag 30 is embedded at equal intervals during the manufacture of the conveyor belt 10, the length of each interval L is likely to be different when the belt is wound around the pulley 20 because the elongation rate differs depending on the interval L. In addition, when one belt member is made endless by one of the joints, the intervals L defined by the RFID tags located at both ends of the belt member are likely to be different in length from the other intervals L. Note that the present invention is not limited to the intervals L being different from each other in length, and the intervals L may be equal in length.

[0032] The RFID tag 30 may include a rectangular base sheet, an IC chip provided in the center of the base sheet, and a pair of antennas extending from the IC chip toward both ends of the base sheet (hereinafter, Type 1).

[0033] In addition, the RFID tag 30 may include a dielectric layer, a radiating element formed in a loop shape from the front surface to the back surface of the dielectric layer, and an IC chip mounted on the front surface of the dielectric layer and connected to the radiating element (hereinafter, Type 2).

[0034] In addition, the RFID tag 30 may include a dielectric layer, a plate-shaped radiating element formed on the surface of the dielectric layer, a plate-shaped ground conductor formed on the back surface of the dielectric layer, and an IC chip connected to the radiating element (hereinafter, Type 3).

[0035] In addition, the RFID tag 30 may include a dielectric layer, a radiating element formed on the surface of the dielectric layer, and a metal layer formed on the back surface of the dielectric layer for reflecting electromagnetic waves from the surface side of the dielectric layer toward the radiating element (hereinafter, Type 4).

[0036] It is preferable that each RFID tag 30 is of the same type and is provided on the conveyor belt 10 with each facing in the same direction. For example, if the RFID tags 30 are of the above type 1, each RFID tag 30 is provided on the conveyor belt 10 with each antenna extending in the same direction. Also, if the RFID tags 30 are of the above types 2 to 4, each RFID tag 30 is provided on the conveyor belt 10 with the surface of each dielectric layer facing the reader 40 and with each radiating element extending in the same direction.

[0037] The reader 40 of this embodiment is an RFID reader. The reader 40 is configured to read signals including information of the RFID tags 30 in a non-contact manner using radio waves in the UHF band. The reader 40 is disposed so as to transmit radio waves toward the outer circumferential surface of the conveyor belt 10. The reader 40 is fixed so that the distance from the outer circumferential surface of the conveyor belt 10 does not change. The reader 40 is configured to communicate with each RFID tag 30, convert information in which each identification code corresponds to the time of communication into a signal, and transmit the signal to the processing device 60.

[0038] The storage device 50 of the present embodiment stores the first circumferential length (the circumferential length at the first time point) as length information of the conveyor belt 10. The first circumferential length is preferably a value obtained by actually measuring the circumferential length of the conveyor belt 10 in a state where it is wound around the pulley 20.

[0039] The storage device 50 also stores, in association with each other, the identification code C of each RFID tag 30, the interval L0 between adjacent RFID tags 30 at the time of wrapping, and the interval L1 between adjacent RFID tags 30 at the first point in time. For a more specific explanation, it is assumed that the conveyor belt 10 is provided with m RFID tags 30 (m is an integer of 2 or more, preferably 5 or more, and more preferably 10 or more). As a result, the conveyor belt 10 has m intervals L (intervals L0 and L1). Next, an RFID tag at an arbitrary position in the running direction of the conveyor belt 10 is defined as the n-th RFID tag, and an RFID tag adjacent to the n-th RFID tag on the forward side in the belt running direction is defined as the n-1-th RFID tag. The n-th RFID tag also stores an identification code C n The n-1th RFID tag has an identification code C n-1 Furthermore, the distance L0 between the n-1th RFID tag and the nth RFID tag when wrapped is set to L0 n The distance L1 between the n-1th RFID tag and the nth RFID tag at the first time point is L1 nUsing these definitions, the storage device 50 stores the identification code C n and the interval L0 n and interval L1 n In other words, the identification codes are stored in association with each other. Furthermore, the storage device 50 of this embodiment stores the identification codes in the order in which they are read while the conveyor belt 10 is running. These can be expressed as tables shown in Tables 1 and 2 below.

[0040] Each interval L0 and each interval L1 may be a design value of the conveyor belt 10. However, when the conveyor belt 10 is wound around the pulley 20, the elongation rate may be different for each interval L0 and each interval L1. Therefore, it is preferable that the interval L0 is a value obtained based on the position of each RFID tag 30 identified by an RFID reader on the conveyor belt 10 at the time of winding. It is more preferable that the interval L1 is a value obtained based on the position of each RFID tag 30 identified by a method similar to that at the first time point at the end of the break-in operation. Furthermore, it is preferable that an elongation rate E0 representing the extent to which each interval L0 has elongated with respect to the design value is grasped for the conveyor belt 10 at the time of winding. It is also preferable that an elongation rate E1 representing the extent to which each interval L1 has elongated with respect to the design value or interval L0 is grasped for the conveyor belt 10 at the first time point (initial use). That is, the storage device 50 stores the identification code C n and the interval L0 n Interval L0 for design value n Growth rate E0 n It is preferable that the storage device 50 stores the identification code C in association with the identification code C (see Table 1 below). n and the interval L1 n Design value or interval L0 n Interval L1 for n Growth rate of E1 n It is preferable to store the above in association with each other (see Table 2 below).

[0041] Furthermore, the storage device 50 stores a ratio p0 of the time t0 required for the conveyor belt 10 to travel an arbitrary distance of at least one revolution at an arbitrary speed at the time of winding, to the time T0 required for the conveyor belt 10 to travel an arbitrary distance of at least one revolution at the arbitrary speed. For example, in the case of the n-th RFID tag, the storage device 50 stores the ratio p0 of the interval L0 to the time T0. n The time it takes to travel t0 n Percentage of p0 n (See Table 1 below). The storage device 50 also stores a ratio p1 of the time t1 required for the conveyor belt 10 to travel an arbitrary distance of at least one revolution at an arbitrary speed at the first time point to the time T1 required for the conveyor belt 10 to travel an arbitrary distance of at least one revolution at the arbitrary speed. For example, in the case of the n-th RFID tag, the storage device 50 stores the ratio p1 of the interval L1 to the time T1. n The time it takes to travel t1 n Proportion p1 n (See Table 2 below).

[0042] T0 and T1 may be average times obtained by rotating the conveyor belt 10 multiple times (e.g., 10 or more times) at the time of winding or the first time point, measuring the time required for each RFID tag 30 to travel one revolution using an RFID reader, and averaging these. t0 or t1 may be average times obtained by rotating the conveyor belt 10 multiple times (e.g., 10 or more times) at the time of winding or the first time point, measuring the time required for each RFID tag 30 to travel each interval L0 or each interval L1 using an RFID reader, and averaging these.

[0043] The storage device 50 of this embodiment stores an identification code C, an interval L0, an elongation rate E0, a time t0, and a proportion p0 in association with each other, as shown in the following Table 1. The storage device 50 of this embodiment also stores an identification code C, an interval L1, an elongation rate E1, a time t1, and a proportion p1 in association with each other, as shown in the following Table 2.

[0044] [Table 1]

[0045] [Table 2]

[0046] The processing device 60 of this embodiment is provided in a server. The server includes a storage device 50, a communication interface between the reading device 40 and the processing device 60, and a program for controlling the processing device 60. The server may be realized by a server machine or a cloud. The information stored in the storage device 50 may be stored in the cloud. The communication interface functions to transmit and receive information between the reading device 40 and the processing device 60 via a network by wired or wireless communication.

[0047] The processing device 60 of the present embodiment is configured to calculate the speed of the conveyor belt 10 at the second time point based on at least the following (1) and (2). (1) A second circumference of the conveyor belt 10 (the circumference at the second time point) and a difference between the first communication time and the second communication time of any one of the RFID tags 30 (e.g., the nth RFID tag). (2) The interval L2 between adjacent RFID tags 30 at the second point in time and the difference in communication time between each RFID tag 30 (for example, between the n-1th RFID tag and the nth RFID tag)

[0048] The above (1) can be applied to both the case where only one RFID tag 30 is provided and the case where multiple RFID tags 30 are provided. The above (2) can be applied only to the case where multiple RFID tags 30 are provided.

[0049] In this embodiment, as described above, the difference D occurs due to the take-up pulley 23, which may cause the second circumferential length and each interval L2 to vary. Therefore, the belt speed measurement system 1 of this embodiment is provided with an encoder (specifically, a linear encoder) that measures the moving distance d of the take-up pulley 23. The processing device 60 of this embodiment is configured to obtain information on the moving distance d output by the encoder. In addition, it is preferable for the length information on the second circumferential length and each interval L2 to be updated while the conveyor belt 10 is running (i.e., in real time) in order to effectively monitor the device. In particular, since the elongation rate of each interval L2 of the conveyor belt 10 at the second time point may differ, it is preferable that the length information on each interval L2 is updated taking this into consideration. As another method for measuring the moving distance d, for example, it may be measured based on the rotation angle of a stepping motor for moving the take-up pulley 23.

[0050] From these viewpoints, it is possible to assume that the conveyor belt 10 is uniformly elongated in the length direction at the second time point, and allocate the difference D to each interval L2 according to the magnitude of each ratio p0 or each ratio p1. Alternatively, since the elongation rate E0 at the time of winding or the elongation rate E1 at the first time point can be reflected at the second time point, based on this, the difference D may be allocated to each interval L2 according to the magnitude of each elongation rate E0 or each elongation rate E1.

[0051] On the other hand, the second circumference may be the sum of the intervals L2 calculated based on the magnitude of the ratio p0 or the ratio p1. The second circumference may be the sum of the intervals L2 calculated based on the magnitude of the elongation rate E0 or the elongation rate E1. More simply, the second circumference may be the first circumference plus the difference D.

[0052] The processing device 60 of this embodiment is configured to, when a detection error is found between the RFID tag 30 and the reading device 40, complement the information caused by the detection error to calculate the speed of the conveyor belt 10. First, the processing device 60 needs to determine that the n-th RFID tag was not properly detected at any C-th round as the detection error in the above case (1). That is, the processing device 60 needs to deal with the problem of not grasping the difference in the communication time between the C-1th round and the C-th round and the difference in the communication time between the C-th round and the C+1th round as the difference in the communication time between the C-1th round and the C+1th round, so that the measured speed does not deviate significantly from the actual speed. To deal with such a detection error, the processing device 60 calculates, for example, the average value required for the n-th RFID tag to make one revolution by the C-1th round, and determines that a detection error occurred at the C-th round if the time difference from the communication time at the C-1th round to the next communication time deviates significantly (for example, 1.5 times or more) from the average value. Then, the processing device 60 calculates the speed of the conveyor belt 10 based on the length of two revolutions from the C-1th revolution to the C+1th revolution and the time difference between the communication points in time of the C-1th revolution and the C+1th revolution.

[0053] In the above (1), if the nth RFID tag breaks down and is unable to communicate, and is not detected normally from the Cth cycle onwards, it is preferable that the processing device 60 is configured to calculate the speed of the conveyor belt 10 based on the length information and time information related to RFID tags other than the nth RFID tag. In other words, it is preferable that the nth RFID tag is deleted from Table 1.

[0054] Next, the processing device 60 of this embodiment needs to determine that the n-th RFID tag was not detected correctly at any point in time as the above case (2) of detection failure. In order to deal with such a detection failure, the processing device 60, for example, detects the identification code C of the n-1-th RFID tag transmitted from the reading device 40 at any point in time. n-1 If it is determined that the immediately preceding identification code is not adjacent to the immediately preceding identification code transmitted from the reader 40 in the table (for example, if the immediately preceding identification code is identification code C n+1In the case of (a), it is determined that a detection error occurred in the n-th RFID tag. Then, the processing device 60 determines that the n-th RFID tag has been detected within the interval L2 n and interval L2 n+1 and the previous identification code (e.g., identification code C n+1 ) and identification code C n-1 The speed of the conveyor belt 10 is calculated based on the time difference between the communication points corresponding to each of the above. This makes it possible to complement information caused by detection errors, and to calculate the speed of the conveyor belt 10 relatively accurately.

[0055] In the above (2), if the n-th RFID tag breaks down and becomes unable to communicate, the n-th RFID tag is deleted from Tables 1 and 2, and the interval L0 of the n+1-th RFID tag is changed. n+1 or interval L1 n+1 is the interval L0 for the n-1th RFID tag. n+1 or interval L1 n+1 It is preferable to amend it to:

[0056] In the above case (1), the processing device 60 may calculate the speed of the conveyor belt 10 for each RFID tag and calculate the average speed. In the above case (2), the processing device 60 may calculate multiple speeds of the conveyor belt 10 and calculate the average speed. Furthermore, the processing device 60 may calculate the average speed of the speeds calculated in the above cases (1) and (2).

[0057] The speed of the conveyor belt 10 measured by the belt speed measurement system 1 of the present embodiment can be used as an index for determining whether the conveyor belt 10 is running with a normal slip ratio by comparing it with the speed of the conveyor belt 10 calculated by converting the rotation speed of the driven pulley 22.

[0058] The speed of the conveyor belt 10 measured by the belt speed measuring system 1 of this embodiment is advantageous in accurately determining the conveyance amount of the conveyor belt 10.

[0059] Although one embodiment has been shown as an example, the belt speed measurement system according to the present invention is not limited to the configuration of the above embodiment. The belt speed measurement system according to the present invention is also not limited by the above-mentioned effects. The belt speed measurement system according to the present invention can be modified in various ways without departing from the gist of the present invention.

[0060] For example, the above embodiment is applied to a conveying device equipped with a conveyor belt 10, but the present invention is not limited to this, and may be applied to a transmission device equipped with a transmission belt.

[0061] Furthermore, in the above embodiment, a mode in which a plurality of RFID tags are provided has been exemplified, but the present invention is not limited to this, and only one RFID tag may be provided on the belt.

[0062] In the above embodiment, the RFID tag is embedded in the belt, but the present invention is not limited to this, and the RFID tag may be placed on the surface of the belt, such as the outer circumferential surface. Also, the RFID tag may be embedded in the first rubber layer of the belt, and the reader may be disposed to transmit radio waves toward the inner circumferential surface of the belt. [Explanation of symbols]

[0063] 1: belt speed measurement system, 10: conveyor belt, 20: pulley, 21: driving pulley, 22: driven pulley, 23: take-up pulley, 30: RFID tag, 40: reader, 50: storage device, 60: processing device, L: interval, d: travel distance

Claims

1. A belt that is wound around a pulley and rotates. one RFID tag provided on the belt, or a plurality of RFID tags provided at predetermined intervals along the length of the belt; A reader that communicates with the RFID tag to acquire tag information; A storage device that stores length information regarding the circumference of the belt or the interval; a processor for calculating a speed of the belt; The reader is configured to transmit time information regarding a time of communication with the RFID tag to the processor; The processor is configured to calculate a speed of the belt based on the length information and the time information.

2. the plurality of RFID tags each having a unique identification code; 2. The belt speed measuring system according to claim 1, wherein the storage device stores the identification code and the length information in association with each other.

3. 3. The belt speed measuring system of claim 2, wherein when the processing device determines that the random identification code of an RFID tag transmitted from the reading device at any time is an identification code of an RFID tag that is not adjacent to the previous identification code transmitted from the reading device immediately before on the belt, the processing device calculates the speed of the belt based on length information and time information of the RFID tags corresponding to the previous identification code and the random identification code, respectively.

4. The belt is wound around a take-up pulley, 4. The belt speed measuring system of claim 1, wherein the length information in the storage device is adapted to be corrected in response to elongation of the belt by the take-up pulley.

Images