Monitoring system and maintenance management system

Abstract

The present invention appropriately monitors an object to be monitored. Provided is a monitoring system including a wireless tag provided to an object to be monitored, and a movable data acquisition device that acquires data from the wireless tag, wherein: the wireless tag includes a storage unit that stores identification information, and a communication unit that transmits the identification information; and the data acquisition device moves in the vicinity of the wireless tag and, when moving in the vicinity of the wireless tag, stores the identification information acquired from the wireless tag.

Description

Monitoring and maintenance management systems

[0001] The present invention relates to a monitoring system and a maintenance management system.

[0002] Conventionally, there is known a technique for reading identification information of an object using an RFID (Radio Frequency Identification) tag. For example, in Patent Document 1, identification information from a wireless tag is read by a tag reader device. In addition, Patent Document 2 discloses a method for managing logistics information using RFID tags. Patent Document 3 discloses a method for tracking assets and inventory using RFID tags. In Patent Document 4, identification information from a wireless tag is read by a tag reader device.

[0003] JP 2015-219591 A JP 2007-089054 A JP 2011-108239 A JP 2008-024385 A

[0004] According to the systems described in the above documents, the identification information from the wireless tag is read by a tag reader device, which prevents human error. However, when the monitored object is a machine that transports industrial products along a transport direction, there is room for improvement in efficiently reading the identification information from the wireless tag and performing appropriate monitoring.

[0005] The present invention has been made in view of the above, and an object of the present invention is to provide a monitoring system and a maintenance management system that can efficiently read identification information and appropriately monitor a monitoring target.

[0006] In order to solve the above-mentioned problems and achieve the objectives, a monitoring system according to one aspect of the present disclosure is a monitoring system including a wireless tag installed on a monitored object and a mobile data acquisition device that acquires data from the wireless tag, wherein the wireless tag has a memory unit that stores identification information and a communication unit that transmits the identification information, and the data acquisition device moves in the vicinity of the wireless tag and stores the identification information that the data acquisition device acquires from the wireless tag as the data acquisition device moves in the vicinity of the wireless tag.

[0007] The wireless tag may further have a temperature sensor that detects the temperature of the monitored object and outputs temperature data corresponding to the temperature, and the communication unit may transmit the temperature data output by the temperature sensor and the identification information, and monitor the monitored object based on the temperature data and the identification information acquired by the data acquisition device from the wireless tag when moving near the wireless tag.

[0008] The system may include a plurality of the data acquisition devices, and the wireless tag may be provided for each of the plurality of monitored objects, and when the plurality of data acquisition devices move near the wireless tag, the plurality of data acquisition devices may store the identification information acquired from the wireless tag.

[0009] The communication unit may transmit the temperature data and the identification information in association with each other.

[0010] The wireless tag may be attached to the bearing and may further include a monitoring terminal device for monitoring the bearing, the monitoring terminal device having an acquired data storage unit that stores data acquired by the data acquisition device, and may monitor the bearing based on the data stored in the acquired data storage unit.

[0011] The wireless tag may further include a temperature sensor that detects the temperature of the monitored object, and a judgment unit that judges whether the temperature detected by the temperature sensor exceeds a predetermined threshold, the memory unit stores the judgment result of the judgment unit indicating that the temperature detected by the temperature sensor has exceeded the predetermined threshold, and the identification information, and the communication unit transmits the judgment result and the identification information, and the data acquisition device may monitor the monitored object based on the judgment result and the identification information acquired from the wireless tag when moving near the wireless tag.

[0012] The system may include a plurality of the data acquisition devices, and the wireless tag may be provided for each of the plurality of monitored objects, and when the plurality of data acquisition devices move near the wireless tag, the plurality of data acquisition devices may store the identification information acquired from the wireless tag.

[0013] The communication unit may transmit the determination result and the identification information in association with each other.

[0014] The wireless tag may be attached to the bearing and may further include a monitoring terminal device for monitoring the bearing, the monitoring terminal device having an acquired data storage unit that stores data acquired by the data acquisition device, and may monitor the bearing based on the data stored in the acquired data storage unit.

[0015] The monitoring terminal device may further include an alarm unit that outputs an alarm based on the determination result.

[0016] The wireless tag may further include an acceleration sensor that detects the acceleration of the monitored object, and a judgment unit that judges whether vibrations based on the acceleration detected by the acceleration sensor exceed a predetermined threshold, the memory unit stores the judgment result of the judgment unit and identification information indicating that vibrations based on the acceleration detected by the acceleration sensor have exceeded the predetermined threshold, and the communication unit transmits the judgment result and the identification information, and the data acquisition device may monitor the monitored object based on the judgment result and the identification information acquired from the wireless tag when moving near the wireless tag.

[0017] The wireless tag may further include an acceleration sensor that detects the acceleration of the monitored object, and a judgment unit that judges whether vibrations based on the acceleration detected by the acceleration sensor exceed a predetermined threshold, the memory unit stores the judgment result of the judgment unit and identification information indicating that vibrations based on the acceleration detected by the acceleration sensor have exceeded the predetermined threshold, and the communication unit transmits the judgment result and the identification information, and the data acquisition device may monitor the monitored object based on the judgment result and the identification information acquired from the wireless tag when moving near the wireless tag.

[0018] The system may include a plurality of the data acquisition devices, and the wireless tag may be provided for each of the plurality of monitored objects, and when the plurality of data acquisition devices move near the wireless tag, the plurality of data acquisition devices may store the identification information acquired from the wireless tag.

[0019] The communication unit may transmit the determination result and the identification information in association with each other.

[0020] The wireless tag may be attached to the bearing and may further include a monitoring terminal device for monitoring the bearing, the monitoring terminal device having an acquired data storage unit that stores data acquired by the data acquisition device, and may monitor the bearing based on the data stored in the acquired data storage unit.

[0021] The monitoring terminal device may further include an alarm unit that outputs an alarm based on the determination result.

[0022] A maintenance management system according to one aspect of the present disclosure includes a plurality of wireless tags each provided near a plurality of maintenance management targets and each having a temperature sensor for acquiring the temperature of the maintenance management targets; a data acquisition device for acquiring a plurality of temperature data from the plurality of wireless tags; a memory unit for storing the plurality of temperature data acquired by the data acquisition device; a judgment unit for judging whether the temperature data stored in the memory unit is above a predetermined threshold; and a display unit for displaying the plurality of temperature data read out from the memory unit, wherein the display unit displays the plurality of temperature data that is above the predetermined threshold in a manner different from other temperature data based on the judgment result of the judgment unit.

[0023] When the value of the temperature data is equal to or greater than a first threshold based on the determination result of the determination unit, the display unit may display the temperature data in a manner different from that of the other temperature data.

[0024] The display unit may be configured to display the temperature data with a higher value in a manner different from the other temperature data when the difference between the temperature data of the maintenance management object at an adjacent position is equal to or greater than a second threshold value based on the judgment result of the judgment unit.

[0025] The display unit may include a calculation unit that calculates an average value, and when the difference between the average value and the temperature data is equal to or greater than a third threshold value based on the judgment result of the judgment unit, the display unit may display the temperature data in a manner different from the other temperature data.

[0026] The display unit may display the plurality of temperature data using a bar graph, and among the temperature data displayed using the bar graph, temperature data that is displayed in a manner different from the other temperature data may be displayed in a color different from the display color of the other temperature data.

[0027] According to the monitoring system of the present disclosure, it is possible to appropriately monitor a monitoring target, and it is also possible to easily determine whether a temperature acquired from a wireless tag is an appropriate value.

[0028] FIG. 1 is a diagram illustrating a monitoring system according to a first embodiment of the present disclosure. FIG. 2 is a diagram illustrating an example of a monitoring target by the monitoring system. FIG. 3 is a perspective view illustrating an example of a mechanical component in FIG. 2. FIG. 4 is a diagram illustrating an example in which multiple mechanical devices are monitored. FIG. 5 is a flowchart illustrating an example of operation of the monitoring system according to the first embodiment. FIG. 6 is a diagram illustrating an example of data acquired from a wireless tag by a tag reader device. FIG. 7 is a diagram illustrating an example of temperature measurement results of each shaft member. FIG. 8 is a diagram illustrating an example of temperature measurement results of one shaft member. FIG. 9 is a diagram illustrating an example of temperature measurement results of one shaft member. FIG. 10 is a diagram illustrating an example of temperature measurement results of one shaft member. FIG. 11 is a diagram illustrating a monitoring system according to a second embodiment of the present disclosure. FIG. 12 is a flowchart illustrating an example of operation of the monitoring system according to the second embodiment. FIG. 13 is a diagram illustrating a tag reader device of a monitoring system according to a third embodiment of the present disclosure. FIG. 14 is a diagram illustrating a monitoring system according to a fourth embodiment of the present disclosure. FIG. 15 is a diagram illustrating an example of the configuration of the determination unit in FIG. 14. FIG. 16 is a diagram illustrating an example in which multiple mechanical devices are monitored. FIG. 17 is a flowchart showing an example of operation of a monitoring system according to a fourth embodiment. FIG. 18 is a diagram showing an example of data acquired by a tag reader device from a wireless tag. FIG. 19 is a diagram showing a monitoring system according to a sixth embodiment of the present disclosure. FIG. 20 is a diagram showing an example of the configuration of a determination unit in FIG. 19. FIG. 21 is a diagram showing an example of data acquired by a tag reader device from a wireless tag. FIG. 22 is a diagram showing a maintenance management system according to a seventh embodiment of the present disclosure. FIG. 23 is a diagram showing an example of a maintenance management object by the maintenance management system. FIG. 24 is a flowchart showing an example of operation of the maintenance management system according to the seventh embodiment. FIG. 25 is a flowchart showing a first example of processing in a control unit of the maintenance management device in FIG. 22. FIG. 26 is a diagram showing an example of data acquired by a tag reader device from a wireless tag. FIG. 27 is a flowchart showing a second example of processing in a control unit of the maintenance management device in FIG. 22. FIG. 28 is a diagram showing a maintenance management system according to a ninth embodiment of the present disclosure. FIG. 29 is a flowchart showing a third example of processing in a control unit of the maintenance management device in FIG. 28.

[0029] Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. In the following description of each embodiment, components that are the same or equivalent to those in other embodiments will be given the same reference numerals, and their description will be simplified or omitted. The present invention is not limited to each embodiment. Furthermore, the components of each embodiment include those that are easily replaceable by those skilled in the art, or those that are substantially the same. The configurations described below can be combined as appropriate. Omissions, substitutions, or modifications of the configurations can be made without departing from the spirit of the invention. Note that in the second and subsequent embodiments, descriptions of matters common to the first embodiment may be omitted as appropriate.

[0030] (First embodiment) Fig. 1 is a diagram showing a monitoring system according to a first embodiment of the present disclosure. In Fig. 1, the monitoring system 100 includes a wireless tag 10, a tag reader device 20, and a monitoring terminal device 30. The wireless tag 10 is provided at an object to be monitored by the monitoring system 100. The tag reader device 20 can acquire data from the wireless tag 10. The tag reader device 20 can also write data to the wireless tag 10. The tag reader device 20 corresponds to a data acquisition device of the present disclosure.

[0031] (Wireless Tag) The wireless tag 10 includes an antenna 11, a temperature sensor 12, a control unit 13, and a power supply unit 14. The control unit 13 has a communication unit 131 and a storage unit 132. The wireless tag 10 is, for example, an RFID tag.

[0032] The antenna 11 is a transmitting and receiving antenna, i.e., the antenna 11 functions as both a transmitting antenna and a receiving antenna.

[0033] The temperature sensor 12 detects temperature. Specifically, the temperature sensor 12 detects the temperature of a monitoring target to which the wireless tag 10 is attached. The temperature detected by the temperature sensor 12 is stored as temperature data in the memory unit 132 of the control unit 13. In other words, the temperature sensor 12 outputs temperature data corresponding to the temperature.

[0034] The communication unit 131 can receive data wirelessly via the antenna 11. The communication unit 131 can transmit data wirelessly via the antenna 11.

[0035] The storage unit 132 stores identification information 1320 for identifying the wireless tag 10 itself. The storage unit 132 also stores the temperature detected by the temperature sensor 12 as temperature data. The data stored in the storage unit 132 can be read out.

[0036] The power supply unit 14 supplies power to each component within the wireless tag 10. The power supply unit 14 is, for example, a primary battery. Because power is supplied from the power supply unit 14, the wireless tag 10 can detect temperature using the temperature sensor 12 and store the temperature data in the memory unit 132.

[0037] When a data read signal is transmitted from tag reader device 20, wireless tag 10 reads the data stored in memory unit 132 and transmits it to tag reader device 20. At this time, communication unit 131 of wireless tag 10 associates the temperature data with the identification information and transmits it to tag reader device 20.

[0038] (Tag Reader Device) The tag reader device 20 includes an antenna 21 , a control unit 22 , a power supply unit 23 , and a motor 24 .

[0039] The antenna 21 is a transmitting and receiving antenna, i.e., the antenna 21 functions as both a transmitting antenna and a receiving antenna.

[0040] The control unit 22 has a communication unit 221, a storage unit 222, a reading unit 223, a writing unit 224, and a driving unit 225. The communication unit 221 can wirelessly transmit and receive data to and from the wireless tag 10 via the antenna 21. The communication unit 221 can also transmit and receive data to and from the monitoring terminal device 30 via the network NW. The tag reader device 20 can transmit temperature data from the temperature sensor 12 of the wireless tag 10 to the monitoring terminal device 30.

[0041] The storage unit 222 stores data acquired by the communication unit 221. The storage unit 222 stores the temperature data and identification information acquired by the communication unit 221 in association with each other. The storage unit 222 also stores various data and programs necessary for the operation of the tag reader device 20.

[0042] The reading unit 223 can receive data transmitted from the wireless tag 10 using the antenna 21 and the communication unit 221, and can read data stored in the wireless tag 10. This allows the tag reader device 20 to acquire data from the wireless tag 10.

[0043] The reading unit 223 can simultaneously communicate wirelessly with multiple wireless tags 10, and can simultaneously acquire temperature data from multiple wireless tags 10. At this time, the temperature data is acquired in a state in which identification information is associated with the temperature data. Therefore, the tag reader device 20 acquires the temperature data from each temperature sensor of the multiple wireless tags 10 in a relatively short time. The tag reader device 20 transmits the temperature data from the multiple temperature sensors to the monitoring terminal device 30.

[0044] The writing unit 224 can transmit data to the wireless tag 10 using the antenna 21 and the communication unit 221. This allows the tag reader device 20 to write data to the wireless tag 10. The driving unit 225 controls the motor 24 to move the tag reader device 20.

[0045] The power supply unit 23 supplies power to each unit in the tag reader device 20. The power supply unit 23 is, for example, a primary battery.

[0046] (Monitoring Terminal Device) The monitoring terminal device 30 includes a communication unit 31, a storage unit 32, a control unit 33, and a power supply unit 34. The communication unit 31 can transmit and receive data to and from the tag reader device 20 via the network NW. The monitoring terminal device 30 may be provided near the tag reader device 20, or may be provided in a remote location.

[0047] The memory unit 32 stores data acquired by the tag reader device 20 from the wireless tag 10. The memory unit 32 corresponds to the acquired data memory unit in the present disclosure. The control unit 33 includes, for example, a central processing unit (CPU), a read-only memory (ROM), a random access memory (RAM), an input interface, and an output interface (not shown). The CPU, ROM, and RAM are connected via an internal bus (not shown). The ROM stores programs such as a BIOS. The CPU uses the RAM as a work area and executes programs stored in the ROM or the memory unit 32 to realize various functions. The control unit 33 can perform editing, such as classification and rearrangement, of the data stored in the memory unit 32. The power supply unit 34 supplies power to each component of the monitoring terminal device 30.

[0048] (Example of monitored object) Fig. 2 is a diagram showing an example of a monitored object by the monitoring system. Fig. 2 is a diagram showing a case where a mechanical device 200 is the monitored object. Fig. 3 is a perspective view showing an example of a mechanical component 40 in Fig. 2.

[0049] 2, the machine 200 is, for example, a roller conveyor that conveys industrial products (not shown) along a conveying direction. The machine 200 includes a pair of support bases 70 and a plurality of roller devices 60. In this embodiment, the number of roller devices 60 is 10, but is not limited to this number.

[0050] The pair of support bases 70 support a plurality of roller devices. The pair of support bases 70 are rectangular parallelepiped shapes that extend in the direction of arrow Y1, which is the conveying direction of industrial products.

[0051] The roller device 60 includes a roller member 50 and a pair of mechanical components 40. The mechanical components 40 are the monitoring target of the present disclosure.

[0052] The roller device 60 includes a shaft member 41 and a roller member 50. The shaft member has a cylindrical shape extending along a central axis.

[0053] The roller member 50 has a cylindrical shape and is disposed on the circumferential surface of the shaft member 41, and rotates integrally with the shaft member 41. Both ends of the shaft member 41 are exposed from the roller member 50.

[0054] The pair of mechanical components support the roller member 50 so as to be rotatable relative to one another. Specifically, the pair of mechanical components support both ends of the shaft member so as to be rotatable relative to one another. The mechanical components 40 are, for example, plummer blocks.

[0055] As shown in FIG. 2 , tag reader device 20 moves in the vicinity of mechanical device 200. Tag reader device 20 moves to a position where it can transmit and receive signals to and from wireless tags 10. That is, tag reader device 20 acquires data from wireless tags 10 while circulating. Tag reader device 20 moves along a track, such as a rail provided on the floor or ceiling of a room in which mechanical device 200 is installed. Alternatively, tag reader device 20 may move along a predetermined path on the floor without a track. For example, a program for controlling motor 24 so that tag reader device 20 moves autonomously along a predetermined path is stored in memory unit 222. Then, control unit 22 reads and executes the program.

[0056] As shown in Fig. 3, the mechanical component 40 has a bearing 42 and holes 44a and 44b. An end of the shaft member 41 of the roller member 50 is inserted into a through hole 43 of the bearing 42. The bearing 42 rotatably supports the shaft member 41. The mechanical component 40 is fixed to a support base 70 (see Fig. 2) by, for example, bolts (not shown). The bolts (not shown) pass through, for example, the holes 44a and 44b and are inserted into screw holes in the support base 70.

[0057] The mechanical component 40 is also provided with a wireless tag 10. The wireless tag 10 is provided, for example, below the bearing 42. The wireless tag 10 is attached to the surface of the mechanical component 40 with, for example, adhesive tape. The wireless tag 10 has the temperature sensor 12 as described above. Temperature data detected by the temperature sensor 12 is stored in the memory unit 132 within the wireless tag 10, and the temperature data is transmitted to the tag reader device 20 together with identification information 1320.

[0058] 2, one tag reader device 20 is provided for one mechanical device 200. One mechanical device 200 has ten roller members 50, and a wireless tag 10 is attached to each of a total of 20 mechanical components 40 provided at both ends of each roller member 50. In this example, all of the wireless tags 10 of the 20 mechanical components 40 are provided within the communication range of the tag reader device 20. Therefore, the tag reader device 20 can acquire identification information and temperature data from the 20 wireless tags 10 provided on the 20 mechanical components 40, respectively.

[0059] It is also possible to provide a wireless tag 10 on one of the mechanical components 40 at both ends of the roller member 50, and not provide a wireless tag 10 on the other mechanical component 40. Wireless tags 10 may be provided on only some of the multiple mechanical components 40 provided in the mechanical device 200, and these may be monitored.

[0060] Fig. 4 is a diagram showing an example in which a plurality of mechanical devices 200 are monitored. In the example shown in Fig. 4, three mechanical devices 200a, 200b, and 200c are monitored. In the example shown in Fig. 4, one tag reader device 20 is provided for the three mechanical devices 200a, 200b, and 200c. The tag reader device 20 moves near the three mechanical devices 200a, 200b, and 200c, for example, as indicated by arrow Y2. In this example, the tag reader device in the position before movement is given the symbol "20," and the tag reader device in the position after movement is given the symbol "20'."

[0061] Here, all of the mechanical components 40 included in mechanical device 200a and some of the mechanical components 40 included in mechanical device 200b are located within communication range 120 of tag reader device 20 before movement. On the other hand, all of the mechanical components 40 included in mechanical device 200c and some of the mechanical components 40 included in mechanical device 200b are located within communication range 120' of tag reader device 20' at the position after movement. In this way, tag reader device 20 moves so that all of the mechanical components 40 are located within the combined range of communication range 120 and communication range 120', whereby tag reader device 20 can acquire identification information and temperature data from each wireless tag 10.

[0062] 1 , the identification information and temperature data acquired from each wireless tag 10 are stored in the storage unit 222 and then sent to the monitoring terminal device 30 via the network NW. The monitoring terminal device 30 stores the identification information and temperature data in the storage unit 32. The control unit 33 can edit the data stored in the storage unit 32, such as by classifying or rearranging the data.

[0063] The temperature sensor 12 of each wireless tag 10 detects the temperature, for example, at a predetermined cycle. For example, the temperature sensor 12 detects the temperature once a day at a set time. Alternatively, the temperature sensor 12 may detect the temperature at predetermined intervals. For example, the temperature sensor 12 may detect the temperature every hour, every 30 minutes, every minute, or every 30 seconds.

[0064] The identification information and temperature data may be transmitted to the tag reader device 20 each time the wireless tag 10 detects a temperature, or may be transmitted in bulk to the tag reader device 20 when the amount of data stored in the memory unit 132 of the wireless tag 10 reaches a predetermined amount. In the former case, the monitoring process can be carried out more quickly. In the latter case, transmitting the data in bulk can reduce consumption of the power supply unit 14. As described above, the monitoring system can obtain temperature data for each monitoring target identified by the obtained identification information and monitor for abnormalities in the temperature data.

[0065] 5 is a flowchart showing an example of operation of the monitoring system 100 according to the first embodiment.

[0066] 5, steps S101 to S106 show an example of the operation of the wireless tag 10, steps S200 to S205 show an example of the operation of the tag reader device 20, and steps S301 to S302 show an example of the operation of the monitoring terminal device 30.

[0067] 5, the wireless tag 10 acquires temperature data from the temperature sensor 12 in advance (step S101) and stores the data in the storage unit 132 (step S102).

[0068] Thereafter, tag reader device 20 starts moving (step S200). When tag reader device 20 transmits a data read signal to wireless tag 10 (step S201), wireless tag 10 receives the read signal (step S103). Wireless tag 10 then acquires temperature data from temperature sensor 12 (step S104) and reads the identification information stored in memory unit 132 (step S105). Wireless tag 10 transmits the temperature data together with the identification information (step S106), which tag reader device 20 receives (step S202).

[0069] The tag reader device 20 stores the received temperature data and identification information in the storage unit 222 (step S203). The tag reader device 20 then transmits the temperature data and identification information (step S204), which the monitoring terminal device 30 receives (step S301). The tag reader device 20 then stops moving (step S205). The monitoring terminal device 30 stores the received temperature data and identification information in the storage unit 32 (step S302). Through the above process, the monitoring terminal device 30 can acquire the temperature data and identification information and perform editing, such as classification and rearrangement, on the data stored in the storage unit 32. By utilizing the data stored in the storage unit 32, the monitoring target can be monitored. In other words, the monitoring system can monitor abnormalities in the temperature data for each monitoring target identified by the acquired identification information.

[0070] (Example of Temperature Data) Fig. 6 is a diagram showing an example of data acquired by tag reader device 20 from wireless tag 10. Fig. 6 shows an example of data transmitted from tag reader device 20 to monitoring terminal device 30 and stored in storage unit 32.

[0071] As shown in Fig. 6, the RFID identification information "rfid0001", "rfid0002", etc. are associated with other data and stored in the storage unit 32. For example, the identification information "rfid0001" is associated with the acquisition time (i.e., year, month, day, hour, minute), the serial number (s / n) which is the bearing's identification information (ID), and the measured temperature from the temperature data. In this example, the identification information is further associated with the date and details of the previous maintenance (e.g., grease refill, checklist included), the date and details of the next recommended maintenance, the date of operation start, the date and details of the past maintenance history, and the device name, unit name, and measured temperature which are device information.

[0072] The unit name is information for identifying the shaft member described with reference to Figures 2 and 4. For example, it is "Shaft 1-1", "Shaft 1-2", "Shaft 1-3", "Shaft 1-4", "Shaft 2-1", "Shaft 2-2", "Shaft 3-1", "Shaft 3-2", "Shaft 3-3", "Shaft 3-4".

[0073] Fig. 7 is a diagram showing an example of the temperature measurement results of each shaft member. The monitoring terminal device 30 can edit the data shown in Fig. 6 and display the graph shown in Fig. 7 on a screen not shown.

[0074] 8 to 10 are diagrams showing examples of temperature measurement results for one shaft member. 8 to 10 are diagrams showing examples of temperature measurement results for shaft 2-1. FIG. 8 shows the average value of temperature data for shaft 2-1 over a certain period (for example, one day). In the example shown in FIG. 8, temperature measurements are not performed on non-working days such as "May 1st," so there is no temperature data for non-working days.

[0075] 9 shows the average value of temperature data for a certain period (for example, one day) on axis 2-1. In the example shown in FIG. 9, temperature measurements are also taken on non-working days such as May 1st, so temperature data also exists for non-working days.

[0076] Figure 10 shows time-series temperature data for axis 2-1. In the example shown in Figure 10, the results are measured every 30 seconds. In this way, the frequency of measurements can be increased. The frequency of measurements can also be increased for axes that are included in the checklist.

[0077] Second Embodiment Fig. 11 is a diagram showing a monitoring system according to a second embodiment of the present disclosure. In Fig. 11, a monitoring system 100a according to the second embodiment differs from the monitoring system 100 according to the first embodiment in that the monitoring system 100a includes a wireless tag 10a that does not include a power supply unit. The wireless tag 10a operates using power based on electromagnetic waves transmitted by a tag reader device 20. That is, when the antenna 11 of the wireless tag 10a receives electromagnetic waves transmitted from the tag reader device 20, a current flows due to induction by the received electromagnetic waves. The wireless tag 10a operates using this current as a power source.

[0078] In the monitoring system according to the first embodiment described above, the temperature sensor 12 of each wireless tag 10 detects the temperature, for example, at a predetermined cycle, and the temperature is sequentially stored in the storage unit 132. When a data read signal is transmitted from the tag reader device 20 to the wireless tag 10, the stored temperature data and identification information are transmitted from the wireless tag 10 to the tag reader device 20.

[0079] In contrast, in the monitoring system 100a according to the second embodiment, when a data read signal is transmitted from the tag reader device 20 to the wireless tag 10, the temperature is detected by the temperature sensor 12. In other words, the wireless tag 10 operates using power based on the electromagnetic waves of the read signal, and the temperature is detected by the temperature sensor 12. Other operations of the monitoring system 100a are the same as those of the monitoring system 100 according to the first embodiment.

[0080] (Operation Example) Fig. 12 is a flowchart showing an operation example of the monitoring system 100a according to the second embodiment. Fig. 12 shows the operations of the wireless tag 10, tag reader device 20, and monitoring terminal device 30 of the monitoring system 100a.

[0081] 12, steps S103 to S106 show an example of the operation of the wireless tag 10, steps S200 to S205 show an example of the operation of the tag reader device 20, and steps S301 to S302 show an example of the operation of the monitoring terminal device 30.

[0082] 12, tag reader device 20 starts moving (step S200). Then, when a data read signal is transmitted from tag reader device 20 to wireless tag 10 (step S201), wireless tag 10 receives the read signal (step S103). Wireless tag 10 then acquires temperature data from temperature sensor 12 (step S104) and reads the temperature data and identification information stored in memory unit 132 (step S105). Wireless tag 10 transmits the temperature data together with the identification information (step S106), which tag reader device 20 receives (step S202).

[0083] The subsequent operations are the same as those of the monitoring system 100 described with reference to FIG. 5 . That is, the tag reader device 20 stores the received temperature data and identification information in the storage unit 222 (step S203). Thereafter, the tag reader device 20 transmits the temperature data and identification information (step S204), and the monitoring terminal device 30 receives them (step S301). The tag reader device 20 ends its movement (step S205). The monitoring terminal device 30 stores the received temperature data and identification information in the storage unit 32 (step S302). Through the above processing, the monitoring terminal device 30 can acquire the temperature data and identification information and can perform editing, such as classification and rearrangement, on the data stored in the storage unit 32. By utilizing the data stored in the storage unit 32, the monitoring target can be monitored.

[0084] (Third Embodiment) In the monitoring systems according to the first and second embodiments described above, one tag reader device 20 is used, but multiple tag reader devices may also be used. FIG. 13 is a diagram showing tag reader devices in a monitoring system according to a third embodiment of the present disclosure. As shown in FIG. 13, the monitoring system according to the third embodiment uses two tag reader devices 20a and 20b. The tag reader device 20a moves near three mechanical devices 200a, 200b, and 200c, for example, as indicated by arrow Y3. In this example, the tag reader device at the position before movement is labeled "20a," and the tag reader device at the position after movement is labeled "20a'." Similarly, the tag reader device 20b moves near the three mechanical devices 200a, 200b, and 200c, for example, as indicated by arrow Y4. In this example, the tag reader device at the position before movement is labeled "20b," and the tag reader device at the position after movement is labeled "20b'."

[0085] The communication range 120a of tag reader device 20a before movement includes all of the mechanical components 40 included in mechanical device 200a and some of the mechanical components 40 included in mechanical device 200b. Furthermore, the communication range 120b of tag reader device 20b before movement includes all of the mechanical components 40 included in mechanical device 200a and some of the mechanical components 40 included in mechanical device 200b. Meanwhile, the communication range 120a' of tag reader device 20a' at a position after movement includes all of the mechanical components 40 included in mechanical device 200c and some of the mechanical components 40 included in mechanical device 200b. Furthermore, the communication range 120b' of tag reader device 20b' at a position after movement includes all of the mechanical components 40 included in mechanical device 200c and some of the mechanical components 40 included in mechanical device 200b. In this way, the multiple tag reader devices 20a, 20b move so that all mechanical components 40 are located within a range that combines the communication ranges 120a, 120b before the movement and the communication ranges 120a', 120b' after the movement, and thereby the tag reader devices 20a, 20b can acquire the identification information and temperature data from each wireless tag 10. The identification information and temperature data acquired by the multiple tag reader devices 20a, 20b are transmitted to the monitoring terminal device 30 and stored in the memory unit 32 within the monitoring terminal device 30. In other words, the identification information and temperature data are stored in the memory unit 32 that is provided in common for the multiple tag reader devices 20a, 20b. By moving the multiple tag reader devices 20a, 20b, it is possible to reliably acquire the identification information and temperature data from each wireless tag 10 of all mechanical components 40. In particular, when the directivities of the antennas provided in the tag reader devices 20a, 20b are different from each other, the identification information and temperature data can be reliably acquired by moving the multiple tag reader devices.

[0086] In the above-described embodiments, the identification information and temperature data are transmitted from the wireless tag to the tag reader device, but it is also possible to transmit only the identification information from the wireless tag to the tag reader device. In this way, the tag reader device can receive the identification information and determine the number of machine parts to be monitored, etc.

[0087] The monitoring system 100 of the first embodiment, the monitoring system 100a of the second embodiment, and the monitoring system of the third embodiment described above enable monitoring of production facilities such as factory premises without requiring a maintenance inspector to directly visit the vicinity of the machinery. Specifically, it is possible to predict abnormalities associated with temperature changes and identify the associated bearings. For example, temperature monitoring and processing can be performed in a remote control room. While the above embodiments describe bearings as the monitoring target, this is not limited thereto, and monitoring of, for example, axial elongation due to heat and rated operation of a motor can also be performed. Furthermore, while the above embodiments describe cases in which the vehicle is self-propelled using a motor, the vehicle is not limited thereto and can also be applied to aerial vehicles such as drones.

[0088] (Fourth embodiment) Fig. 14 is a diagram showing a monitoring system according to a fourth embodiment of the present disclosure. In Fig. 14, a monitoring system 100b includes a wireless tag 10b, a tag reader device 20, and a monitoring terminal device 30a. The wireless tag 10b is provided at an object to be monitored by the monitoring system 100b. The tag reader device 20 can acquire data from the wireless tag 10b. The tag reader device 20 can also write data to the wireless tag 10b. The tag reader device 20 corresponds to a data acquisition device of the present disclosure.

[0089] (Wireless Tag) The wireless tag 10b includes an antenna 11, a temperature sensor 12, a control unit 13, a power supply unit 14, and a determination unit 15. The control unit 13 has a communication unit 131 and a storage unit 132. The wireless tag 10b is, for example, an RFID tag.

[0090] The antenna 11 is a transmitting and receiving antenna, i.e., the antenna 11 functions as both a transmitting antenna and a receiving antenna.

[0091] The temperature sensor 12 detects the temperature. Specifically, the temperature sensor 12 detects the temperature of the monitoring target to which the wireless tag 10b is attached. The temperature detected by the temperature sensor 12 is sent to the determination unit 15.

[0092] The communication unit 131 can receive data wirelessly via the antenna 11. The communication unit 131 can transmit data wirelessly via the antenna 11.

[0093] The storage unit 132 stores identification information 1320 for identifying the wireless tag 10b itself. The storage unit 132 also stores, as data, the determination result by the determination unit 15. The data stored in the storage unit 132 can be read out.

[0094] The power supply unit 14 supplies power to each component within the wireless tag 10b. The power supply unit 14 is, for example, a primary battery. Because power is supplied from the power supply unit 14, the wireless tag 10b can detect temperature using the temperature sensor 12 and store the temperature determination result based on the temperature data in the memory unit 132.

[0095] The determination unit 15 determines whether the detected temperature value output by the temperature sensor 12 exceeds a predetermined threshold. The determination result of the determination unit 15 is stored in the storage unit 132. For example, if the detected temperature value output by the temperature sensor 12 exceeds the predetermined threshold, the determination result data of the determination unit 15 is "1," and if the detected value is equal to or less than the predetermined threshold, the determination result data of the determination unit 15 is "0," and the determination result "1" or "0" is stored in the storage unit 132.

[0096] The threshold value for the detected temperature value is set, for example, as follows: That is, the temperature when no abnormality occurs in the mechanical device 200 is measured in advance, and a value slightly higher than that temperature value is set as the threshold value.

[0097] When a data read signal is transmitted from tag reader device 20, wireless tag 10b reads the data stored in memory unit 132 and transmits it to tag reader device 20. At this time, communication unit 131 of wireless tag 10b transmits the temperature determination result and identification information to tag reader device 20 in association with each other.

[0098] (Tag Reader Device) The tag reader device 20 includes an antenna 21 , a control unit 22 , a power supply unit 23 , and a motor 24 .

[0099] The antenna 21 is a transmitting and receiving antenna, i.e., the antenna 21 functions as both a transmitting antenna and a receiving antenna.

[0100] The control unit 22 has a communication unit 221, a storage unit 222, a reading unit 223, a writing unit 224, and a driving unit 225. The communication unit 221 can wirelessly transmit and receive data to and from the wireless tag 10b via the antenna 21. The communication unit 221 can also transmit and receive data to and from the monitoring terminal device 30 via the network NW. The tag reader device 20 can transmit to the monitoring terminal device 30 a temperature determination result based on the temperature data from the temperature sensor 12 of the wireless tag 10b.

[0101] The storage unit 222 stores data acquired by the communication unit 221. The storage unit 222 stores the temperature determination result and the identification information acquired by the communication unit 221 in association with each other. The storage unit 222 also stores various data and programs necessary for the operation of the tag reader device 20.

[0102] The reading unit 223 can receive data transmitted from the wireless tag 10b and read data stored in the wireless tag 10b using the antenna 21 and the communication unit 221. This allows the tag reader device 20 to acquire data from the wireless tag 10b.

[0103] The reading unit 223 can simultaneously communicate wirelessly with multiple wireless tags 10b, and can simultaneously obtain temperature determination results from multiple wireless tags 10b. At this time, the temperature determination results are obtained in association with identification information. Therefore, the tag reader device 20 obtains temperature determination results based on the temperature data from each temperature sensor of the multiple wireless tags 10b in a relatively short time. The tag reader device 20 transmits the temperature determination results based on the temperature data from the multiple temperature sensors to the monitoring terminal device 30.

[0104] The writing unit 224 can transmit data to the wireless tag 10b using the antenna 21 and the communication unit 221. This allows the tag reader device 20 to write data to the wireless tag 10b. The driving unit 225 controls the motor 24 to move the tag reader device 20.

[0105] The power supply unit 23 supplies power to each unit in the tag reader device 20. The power supply unit 23 is, for example, a primary battery.

[0106] (Monitoring terminal device) The monitoring terminal device 30 includes a communication unit 31, a storage unit 32, a control unit 33, a power supply unit 34, and an alarm unit 37. The communication unit 31 can transmit and receive data to and from the tag reader device 20 via the network NW. The monitoring terminal device 30 may be provided near the tag reader device 20 or in a remote location.

[0107] The memory unit 32 stores data acquired by the tag reader device 20 from the wireless tag 10b. The memory unit 32 corresponds to the acquired data memory unit in the present disclosure. The control unit 33 includes, for example, a central processing unit (CPU), a read-only memory (ROM), a random access memory (RAM), an input interface, and an output interface (not shown). The CPU, ROM, and RAM are connected via an internal bus (not shown). The ROM stores programs such as a BIOS. The CPU uses the RAM as a work area to execute programs stored in the ROM or the memory unit 32, thereby achieving various functions. The control unit 33 can perform editing, such as classification and rearrangement, of the data stored in the memory unit 32. The power supply unit 34 supplies power to each component of the monitoring terminal device 30.

[0108] The alarm unit 37 outputs an alarm when the determination result of the determination unit 15 of the wireless tag 10b indicates that the temperature exceeds a predetermined threshold. That is, the alarm unit 37 outputs an alarm based on the determination result of the determination unit 15. For example, when the determination result exceeds a predetermined threshold, the alarm is output by displaying an alarm on a display unit (not shown) or by outputting a buzzer sound from a speaker (not shown). This allows a maintenance inspector to recognize that an abnormality in temperature has occurred.

[0109] Fig. 15 is a diagram showing an example of the configuration of the determination unit 15 in Fig. 14. The determination unit 15 shown in Fig. 15 includes a comparator 151 and resistors R1 and R2. The comparator 151 has a positive input terminal (+) and a negative input terminal (-).

[0110] Resistors R1 and R2 are connected in series between the power supply voltage VDD and the ground potential. The connection point between resistors R1 and R2 is connected to the negative input terminal of comparator 151. The voltage value divided by resistors R1 and R2 is input to the negative input terminal of comparator 151. Comparator 151 compares the voltage value at the negative input terminal with the voltage value at the positive input terminal and outputs a voltage value corresponding to the result. That is, comparator 151 outputs a high-level voltage value (H) when the voltage value at the positive input terminal exceeds the voltage value at the negative input terminal. Comparator 151 outputs a low-level voltage value (L) when the voltage value at the positive input terminal is equal to or less than the voltage value at the negative input terminal.

[0111] As described above, the determination unit 15 determines whether the temperature detection value output by the temperature sensor 12 (see FIG. 14 ) exceeds the threshold value determined by the resistor-divided voltage value. Here, for example, the high-level voltage value (H) output by the comparator 151 is associated with "1," and the low-level voltage value (L) is associated with "0." If the data output from the determination unit 15 is "1," this indicates that the temperature detected by the temperature sensor 12 has exceeded the predetermined threshold value. Returning to FIG. 14 , the data output from the determination unit 15 is stored in the memory unit 132. In other words, the memory unit 132 stores the determination result of the determination unit 15 and the identification information.

[0112] (Example of Monitoring Target) The monitoring target in the fourth embodiment is the same as the monitoring target described above with reference to FIGS.

[0113] The tag reader device 20 of the fourth embodiment moves near the mechanical device 200 (see FIG. 2 ), as in the first embodiment. The tag reader device 20 moves to a position where it can transmit and receive signals to and from the wireless tag 10b. That is, the tag reader device 20 acquires data from the wireless tag 10b while patrolling. The tag reader device 20 moves along a track, such as a rail on the floor or ceiling of a room in which the mechanical device 200 is installed. Alternatively, the tag reader device 20 may move along a predetermined path on the floor without a track. For example, a program for controlling the motor 24 to move autonomously along a predetermined path is stored in the storage unit 222. The control unit 22 then reads and executes the program. The tag reader device 20 may be mounted on a drone, and the drone may move to a position where it can transmit and receive signals to and from the wireless tag 10b.

[0114] Fig. 16 is a diagram showing an example in which a plurality of machines 200 are monitored. In the example shown in Fig. 16, three machines 200a, 200b, and 200c are monitored. In the example shown in Fig. 5, one tag reader device 20a is provided for the three machines 200a, 200b, and 200c. The tag reader device 20a moves near the three machines 200a, 200b, and 200c, for example, as indicated by arrow Y2. In this example, the tag reader device in the position before movement is given the symbol "20," and the tag reader device in the position after movement is given the symbol "20'."

[0115] Here, all of the mechanical components 40 included in mechanical device 200a and some of the mechanical components 40 included in mechanical device 200b are located within communication range 120 of tag reader device 20a before movement. On the other hand, all of the mechanical components 40 included in mechanical device 200c and some of the mechanical components 40 included in mechanical device 200b are located within communication range 120' of tag reader device 20a' at the position after movement. In this way, tag reader device 20a moves so that all of the mechanical components 40 are located within the combined range of communication range 120 and communication range 120', whereby tag reader device 20a can acquire identification information and temperature determination results from each wireless tag 10b.

[0116] 14 , the identification information and temperature determination results acquired from each wireless tag 10b are stored in the storage unit 222 and then sent to the monitoring terminal device 30a via the network NW. The monitoring terminal device 30a stores the identification information and temperature determination results in the storage unit 32. The control unit 33 can edit the data stored in the storage unit 32, such as by classifying or rearranging the data.

[0117] The temperature sensor 12 of each wireless tag 10b detects the temperature, for example, at a predetermined cycle. For example, the temperature sensor 12 detects the temperature once a day at a set time. Alternatively, the temperature sensor 12 may detect the temperature at predetermined intervals. For example, the temperature sensor 12 may detect the temperature every hour, every 30 minutes, every minute, or every 30 seconds.

[0118] The determination unit 15 determines whether the temperature detected by the temperature sensor 12 exceeds a predetermined threshold. The identification information and the temperature determination result are stored in the storage unit 132. As described above, the monitoring system can obtain the temperature determination result for each monitoring target identified by the obtained identification information and monitor for temperature abnormalities.

[0119] (Operation Example) Fig. 17 is a flowchart showing an operation example of the monitoring system 100b according to the fourth embodiment. Fig. 17 shows the operations of the wireless tag 10b, tag reader device 20, and monitoring terminal device 30a of the monitoring system 100b.

[0120] In FIG. 16, steps S101 to S106 show an example of the operation of the wireless tag 10b, steps S200 to S205 show an example of the operation of the tag reader device 20, and steps S301 to S302 show an example of the operation of the monitoring terminal device 30a.

[0121] 16, the wireless tag 10b acquires temperature data from the temperature sensor 12 (step S101). Next, the wireless tag 10b determines whether the temperature data exceeds a predetermined threshold (i.e., whether the temperature data is greater than the threshold) in the determination unit 15 (step S101a). If the temperature data exceeds the predetermined threshold, data indicating that the temperature data exceeds the predetermined threshold is stored in the storage unit 132 as a temperature determination result (step S102). If the temperature data does not exceed the predetermined threshold in step S101a, the process returns to step S101 and continues.

[0122] Thereafter, tag reader device 20 starts moving (step S200). When tag reader device 20 transmits a data read signal to wireless tag 10b (step S201), wireless tag 10b receives the read signal (step S103). Wireless tag 10b then reads the identification information stored in memory unit 132 (step S105). Wireless tag 10b transmits the temperature determination result together with the identification information (step S106), and tag reader device 20 receives it (step S202).

[0123] The tag reader device 20 stores the received temperature determination result and identification information in the storage unit 222 (step S203). The tag reader device 20 then transmits the temperature determination result and identification information (step S204), which the monitoring terminal device 30a receives (step S301). The tag reader device 20 then stops moving (step S205). The monitoring terminal device 30a stores the received temperature determination result and identification information in the storage unit 32 (step S302). Through the above process, the monitoring terminal device 30a can acquire the temperature determination result and identification information and can perform editing, such as classification and rearrangement, on the data stored in the storage unit 32. By utilizing the data stored in the storage unit 32, the monitoring target can be monitored. In other words, the monitoring system can monitor temperature abnormalities for each monitoring target identified by the acquired identification information.

[0124] 18 is a diagram showing an example of data acquired from the wireless tag 10b by the tag reader device 20. FIG. 18 shows an example of data transmitted from the tag reader device 20 to the monitoring terminal device 30a and stored in the storage unit 32.

[0125] As shown in FIG. 18 , other data is associated with the RFID identification information "rfid0001," "rfid0002," etc., and stored in the storage unit 32. For example, the identification information "rfid0001" is associated with the acquisition time (i.e., year, month, day, hour, minute), the serial number (s / n) which is the bearing's identification information (ID), and the temperature determination result. In this example, the temperature determination result is "H," which indicates that the temperature has exceeded a predetermined threshold, or "L," which indicates that the temperature is equal to or lower than the predetermined threshold. In this example, the hatched portion in FIG. 18 is "H," which indicates that the temperature has exceeded the predetermined threshold.

[0126] Fifth Embodiment While the monitoring system according to the fourth embodiment described above uses one tag reader device 20, multiple tag reader devices may also be used. Referring again to FIG. 13 , the monitoring system according to the fifth embodiment will be described. As shown in FIG. 13 , the monitoring system according to the fifth embodiment uses two tag reader devices 20a and 20b. Tag reader device 20a moves near three mechanical devices 200a, 200b, and 200c, as indicated by arrow Y3, for example. In this example, the tag reader device at the position before movement is labeled "20a," and the tag reader device at the position after movement is labeled "20a'." Similarly, tag reader device 20b moves near three mechanical devices 200a, 200b, and 200c, as indicated by arrow Y4, for example. In this example, the tag reader device at the position before movement is labeled "20b," and the tag reader device at the position after movement is labeled "20b'."

[0127] The communication range 120a of tag reader device 20a before movement includes all of the mechanical components 40 included in mechanical device 200a and some of the mechanical components 40 included in mechanical device 200b. Furthermore, the communication range 120b of tag reader device 20b before movement includes all of the mechanical components 40 included in mechanical device 200a and some of the mechanical components 40 included in mechanical device 200b. Meanwhile, the communication range 120a' of tag reader device 20a' at a position after movement includes all of the mechanical components 40 included in mechanical device 200c and some of the mechanical components 40 included in mechanical device 200b. Furthermore, the communication range 120b' of tag reader device 20b' at a position after movement includes all of the mechanical components 40 included in mechanical device 200c and some of the mechanical components 40 included in mechanical device 200b. In this way, the multiple tag reader devices 20a, 20b move so that all mechanical components 40 are located within a range that combines the communication ranges 120a, 120b before the movement and the communication ranges 120a', 120b' after the movement, and thereby the tag reader devices 20a, 20b can acquire the identification information and the temperature determination results from each wireless tag 10b. The identification information and the temperature determination results acquired by the multiple tag reader devices 20a, 20b are transmitted to the monitoring terminal device 30 and stored in the memory unit 32 within the monitoring terminal device 30. In other words, the identification information and the temperature determination results are stored in the memory unit 32 that is provided in common for the multiple tag reader devices 20a, 20b. By moving the multiple tag reader devices 20a, 20b, it is possible to reliably acquire the identification information and the temperature determination results from each wireless tag 10b of all mechanical components 40. In particular, when the directivities of the antennas provided in the tag reader devices 20a, 20b are different from each other, the identification information and the temperature determination results can be reliably acquired by moving the multiple tag reader devices.

[0128] The monitoring system of the fourth or fifth embodiment described above allows monitoring of production equipment, such as on a factory site, without requiring a maintenance inspector to directly visit the machinery. Specifically, it is possible to predict abnormalities associated with temperature changes and identify the associated bearings. For example, temperature monitoring and processing can be performed in a remote control room. While the above embodiments focus on bearings as the monitoring target, other monitoring targets can also be implemented, such as monitoring of thermal axial elongation and motor rated operation. Furthermore, for example, when bearings are shipped with tags packed in the boxes containing them, it is also possible to monitor abnormal temperatures during transportation from the time of shipment to the time of assembly into machinery.

[0129] Sixth Embodiment Fig. 19 is a diagram showing a monitoring system according to a sixth embodiment of the present disclosure. In Fig. 19, a monitoring system 100c includes a wireless tag 10c, a tag reader device 20a, and a monitoring terminal device 30a. The wireless tag 10c is provided at an object to be monitored by the monitoring system 100c. The tag reader device 20a can acquire data from the wireless tag 10c. The tag reader device 20a can also write data to the wireless tag 10c. The tag reader device 20a corresponds to the data acquisition device of the present disclosure.

[0130] (Wireless Tag) The wireless tag 10c includes an antenna 11, an acceleration sensor 12a, a control unit 13, a power supply unit 14, and a determination unit 15a. The control unit 13 has a communication unit 131 and a storage unit 132. The wireless tag 10c is, for example, an RFID tag.

[0131] The antenna 11 is a transmitting and receiving antenna, i.e., the antenna 11 functions as both a transmitting antenna and a receiving antenna.

[0132] The acceleration sensor 12a detects acceleration. Specifically, the acceleration sensor 12a detects the acceleration of the monitoring target to which the wireless tag 10c is attached. The acceleration detected by the acceleration sensor 12a is sent to the determination unit 15a.

[0133] The communication unit 131 can receive data wirelessly via the antenna 11. The communication unit 131 can transmit data wirelessly via the antenna 11.

[0134] The storage unit 132 stores identification information 1320 for identifying the wireless tag 10c itself. The storage unit 132 also stores the determination result by the determination unit 15a as data. The data stored in the storage unit 132 can be read out.

[0135] The power supply unit 14 supplies power to each component within the wireless tag 10c. The power supply unit 14 is, for example, a primary battery. Because power is supplied from the power supply unit 14, the wireless tag 10c can detect acceleration using the acceleration sensor 12a and store the vibration determination result based on the acceleration data in the memory unit 132.

[0136] The determination unit 15a determines whether the detected acceleration value output by the acceleration sensor 12a exceeds a predetermined threshold. The determination result of the determination unit 15a is stored in the storage unit 132. For example, if the detected acceleration value output by the acceleration sensor 12a exceeds the predetermined threshold, the vibration determination result data of the determination unit 15a is "1," and if the detected value is equal to or less than the predetermined threshold, the vibration determination result data of the determination unit 15a is "0," and the determination result "1" or "0" is stored in the storage unit 132.

[0137] The threshold value for the detected acceleration value is set, for example, as follows: That is, the acceleration due to vibration when the mechanical device 200 is first installed, or the acceleration due to vibration when no abnormalities occur thereafter, is measured in advance, and a value slightly higher than the acceleration value is set as the threshold value.

[0138] When a data read signal is transmitted from tag reader device 20a, wireless tag 10c reads the data stored in memory unit 132 and transmits it to tag reader device 20a. At this time, communication unit 131 of wireless tag 10c associates the vibration determination result with identification information and transmits them to tag reader device 20a.

[0139] (Tag Reader Device) The tag reader device 20 a includes an antenna 21 , a control unit 22 , a power supply unit 23 , and a motor 24 .

[0140] The antenna 21 is a transmitting and receiving antenna, i.e., the antenna 21 functions as both a transmitting antenna and a receiving antenna.

[0141] The control unit 22 has a communication unit 221, a storage unit 222, a reading unit 223, a writing unit 224, and a driving unit 225. The communication unit 221 can wirelessly transmit and receive data to and from the wireless tag 10c via the antenna 21. The communication unit 221 can also transmit and receive data to and from the monitoring terminal device 30a via the network NW. The tag reader device 20a can transmit to the monitoring terminal device 30a a vibration determination result based on acceleration data from the acceleration sensor 12a of the wireless tag 10c.

[0142] The storage unit 222 stores data acquired by the communication unit 221. The storage unit 222 stores the vibration determination result and the identification information acquired by the communication unit 221 in association with each other. The storage unit 222 also stores various data and programs necessary for the operation of the tag reader device 20a.

[0143] The reading unit 223 can receive data transmitted from the wireless tag 10c and read data stored in the wireless tag 10c using the antenna 21 and the communication unit 221. This allows the tag reader device 20a to acquire data from the wireless tag 10c.

[0144] The reading unit 223 can simultaneously communicate wirelessly with multiple wireless tags 10c and simultaneously acquire vibration determination results from multiple wireless tags 10c. The vibration determination results are acquired in association with identification information. Therefore, the tag reader device 20a acquires vibration determination results based on the acceleration data from each acceleration sensor of the multiple wireless tags 10c in a relatively short time. The tag reader device 20a transmits the vibration determination results based on the acceleration data from the multiple acceleration sensors to the monitoring terminal device 30a.

[0145] The writing unit 224 can transmit data to the wireless tag 10c using the antenna 21 and the communication unit 221. This allows the tag reader device 20a to write data to the wireless tag 10c. The driving unit 225 controls the motor 24 to move the tag reader device 20a.

[0146] The power supply unit 23 supplies power to each unit in the tag reader device 20a. The power supply unit 23 is, for example, a primary battery.

[0147] (Monitoring Terminal Device) Monitoring terminal device 30a includes a communication unit 31, a storage unit 32, a control unit 33, a power supply unit 34, and an alarm unit 37. Communication unit 31 can transmit and receive data to and from tag reader device 20a via network NW. Monitoring terminal device 30a may be provided near tag reader device 20a or in a remote location.

[0148] The memory unit 32 stores data acquired by the tag reader device 20a from the wireless tag 10c. The memory unit 32 corresponds to the acquired data memory unit in the present disclosure. The control unit 33 includes, for example, a central processing unit (CPU), a read-only memory (ROM), a random access memory (RAM), an input interface, and an output interface (not shown). The CPU, ROM, and RAM are connected via an internal bus (not shown). The ROM stores programs such as a BIOS. The CPU uses the RAM as a work area and executes programs stored in the ROM or the memory unit 32 to realize various functions. The control unit 33 can perform editing, such as classification and rearrangement, of the data stored in the memory unit 32. The power supply unit 34 supplies power to each component of the monitoring terminal device 30a.

[0149] The alarm unit 37 outputs an alarm when the determination result of the determination unit 15 of the wireless tag 10c indicates that the vibration exceeds a predetermined threshold. That is, the alarm unit 37 outputs an alarm based on the determination result of the determination unit 15. For example, when the determination result exceeds a predetermined threshold, the alarm is output by displaying an alarm on a display unit (not shown) or by outputting a buzzer sound from a speaker (not shown). This allows a maintenance inspector to recognize that vibration exceeding the threshold has occurred.

[0150] Fig. 20 is a diagram showing an example of the configuration of the determination unit 15a in Fig. 19. The determination unit 15a shown in Fig. 20 includes a comparator 151 and resistors R1 and R2. The comparator 151 has a positive input terminal (+) and a negative input terminal (-).

[0151] Resistors R1 and R2 are connected in series between the power supply voltage VDD and the ground potential. The connection point between resistors R1 and R2 is connected to the negative input terminal of comparator 151. The voltage value divided by resistors R1 and R2 is input to the negative input terminal of comparator 151. Comparator 151 compares the voltage value at the negative input terminal with the voltage value at the positive input terminal and outputs a voltage value corresponding to the result. That is, comparator 151 outputs a high-level voltage value (H) when the voltage value at the positive input terminal exceeds the voltage value at the negative input terminal. Comparator 151 outputs a low-level voltage value (L) when the voltage value at the positive input terminal is equal to or less than the voltage value at the negative input terminal.

[0152] As described above, the determination unit 15a determines whether the acceleration detection value output by the acceleration sensor 12a (see FIG. 19) exceeds a threshold value determined by a voltage value divided by resistors. Here, for example, the high-level voltage value (H) output by the comparator 151 is associated with "1," and the low-level voltage value (L) is associated with "0." If the data output from the determination unit 15a is "1," this indicates that the vibration based on the acceleration detected by the acceleration sensor 12a has exceeded a predetermined threshold value. Returning to FIG. 19, the data output from the determination unit 15a is stored in the memory unit 132. That is, the memory unit 132 stores the determination result of the determination unit 15a and the identification information.

[0153] (Example of Monitoring Target) The monitoring target in the sixth embodiment is the same as the monitoring target described above with reference to FIGS.

[0154] The tag reader device 20a is not fixed but moves near the mechanical device 200 (see FIG. 2 ). The tag reader device 20a moves to a position where it can transmit and receive signals to and from the wireless tag 10c. That is, the tag reader device 20a acquires data from the wireless tag 10c while patrolling. The tag reader device 20a moves along a track, such as a rail provided on the floor or ceiling of the room in which the mechanical device 200 is installed. Alternatively, the tag reader device 20a may move along a predetermined path on the floor without a track. For example, a program for controlling the motor 24 so that the tag reader device 20a moves autonomously along a predetermined path is stored in the storage unit 222. The control unit 22 then reads and executes the program. The tag reader device 20a may be mounted on a drone, and the drone may move to a position where it can transmit and receive signals to and from the wireless tag 10c.

[0155] 15, multiple mechanical devices 200 may be monitored. As described with reference to Fig. 15, tag reader device 20a moves so that all mechanical components 40 are located within the range that combines communication range 120 and communication range 120', and tag reader device 20a can acquire the identification information and vibration determination results from each wireless tag 10c.

[0156] 19 , the identification information and vibration determination results acquired from each wireless tag 10c are stored in the storage unit 222 and then sent to the monitoring terminal device 30a via the network NW. The monitoring terminal device 30a stores the identification information and vibration determination results in the storage unit 32. The control unit 33 can edit the data stored in the storage unit 32, such as by classifying and rearranging the data.

[0157] The acceleration sensor 12a of each wireless tag 10c detects acceleration, for example, at a predetermined cycle. For example, the acceleration sensor 12a detects acceleration once a day at a predetermined time. Alternatively, the acceleration sensor 12a may detect acceleration at predetermined intervals. For example, the acceleration sensor 12a may detect acceleration every hour, every 30 minutes, every minute, or every 30 seconds.

[0158] The determination unit 15 determines whether or not the vibration based on the acceleration detected by the acceleration sensor 12a exceeds a predetermined threshold. The identification information and the vibration determination result are stored in the storage unit 132. As described above, the monitoring system can obtain the vibration determination result for each monitoring target identified by the obtained identification information, and monitor for the occurrence of vibration exceeding the threshold.

[0159] (Operation Example) An operation example of the monitoring system 100c according to the sixth embodiment is similar to that of the monitoring system 100b according to the fourth embodiment described with reference to Fig. 17. An operation example of the monitoring system 100c will be described with reference to Fig. 17 again.

[0160] In FIG. 17, steps S101 to S106 show an example of the operation of the wireless tag 10c, steps S200 to S205 show an example of the operation of the tag reader device 20, and steps S301 to S302 show an example of the operation of the monitoring terminal device 30a.

[0161] 17, the wireless tag 10c acquires acceleration data from the acceleration sensor 12a (step S101). Next, the wireless tag 10c determines whether the vibration data based on the acceleration exceeds a predetermined threshold (i.e., whether it is greater than the threshold) in the determination unit 15a (step S101a). If the vibration data exceeds the predetermined threshold, data indicating that the vibration data exceeds the predetermined threshold is stored in the storage unit 132 as a vibration determination result (step S102). If the vibration data does not exceed the predetermined threshold in step S101a, the process returns to step S101 and continues.

[0162] Thereafter, tag reader device 20 starts moving (step S200). When tag reader device 20 transmits a data read signal to wireless tag 10c (step S201), wireless tag 10c receives the read signal (step S103). Wireless tag 10c then reads the identification information stored in memory unit 132 (step S105). Wireless tag 10c transmits the vibration determination result together with the identification information (step S106), and tag reader device 20 receives it (step S202).

[0163] The tag reader device 20 stores the received vibration determination result and identification information in the storage unit 222 (step S203). The tag reader device 20 then transmits the vibration determination result and identification information (step S204), which the monitoring terminal device 30a receives (step S301). The tag reader device 20 then stops moving (step S205). The monitoring terminal device 30a stores the received vibration determination result and identification information in the storage unit 32 (step S302). Through the above process, the monitoring terminal device 30a can acquire the vibration determination result and identification information and can perform editing, such as classification and rearrangement, on the data stored in the storage unit 32. By utilizing the data stored in the storage unit 32, the monitoring target can be monitored. In other words, the monitoring system can monitor the vibration of each monitoring target identified by the acquired identification information.

[0164] 21 is a diagram showing an example of data acquired from the wireless tag 10c by the tag reader device 20. Fig. 21 shows an example of data transmitted from the tag reader device 20 to the monitoring terminal device 30a and stored in the storage unit 32.

[0165] As shown in FIG. 21 , other data is associated with the RFID identification information "rfid0001," "rfid0002," etc., and stored in the storage unit 32. For example, the identification information "rfid0001" is associated with the acquisition time (i.e., year, month, day, hour, minute), the serial number (s / n) which is the bearing's identification information (ID), and the vibration determination result. In this example, the vibration determination result is "H," which indicates that the predetermined threshold has been exceeded, or "L," which indicates that the vibration is equal to or less than the predetermined threshold. In this example, the hatched portion in FIG. 21 is "H," which indicates that the predetermined threshold has been exceeded.

[0166] Although the monitoring system according to the fifth embodiment described above uses one tag reader device 20, multiple tag reader devices may also be used. Referring again to FIG. 13 , a monitoring system according to a sixth embodiment will be described. As shown in FIG. 13 , the monitoring system according to the sixth embodiment uses two tag reader devices 20a and 20b. Tag reader device 20a moves near three mechanical devices 200a, 200b, and 200c, for example, as indicated by arrow Y3. In this example, the tag reader device at the position before movement is labeled "20a," and the tag reader device at the position after movement is labeled "20a'." Similarly, tag reader device 20b moves near three mechanical devices 200a, 200b, and 200c, for example, as indicated by arrow Y4. In this example, the tag reader device at the position before movement is labeled "20b," and the tag reader device at the position after movement is labeled "20b'."

[0167] The communication range 120a of tag reader device 20a before movement includes all of the mechanical components 40 included in mechanical device 200a and some of the mechanical components 40 included in mechanical device 200b. Furthermore, the communication range 120b of tag reader device 20b before movement includes all of the mechanical components 40 included in mechanical device 200a and some of the mechanical components 40 included in mechanical device 200b. Meanwhile, the communication range 120a' of tag reader device 20a' at a position after movement includes all of the mechanical components 40 included in mechanical device 200c and some of the mechanical components 40 included in mechanical device 200b. Furthermore, the communication range 120b' of tag reader device 20b' at a position after movement includes all of the mechanical components 40 included in mechanical device 200c and some of the mechanical components 40 included in mechanical device 200b. In this way, by moving the multiple tag reader devices 20a, 20b so that all mechanical components 40 are located within a range that combines the communication ranges 120a, 120b before the movement and the communication ranges 120a', 120b' after the movement, the tag reader devices 20a, 20b can acquire the identification information and vibration determination results from each wireless tag 10. The identification information and vibration determination results acquired by the multiple tag reader devices 20a, 20b are transmitted to the monitoring terminal device 30 and stored in the memory unit 32 within the monitoring terminal device 30. In other words, the identification information and vibration determination results are stored in the memory unit 32 that is provided in common for the multiple tag reader devices 20a, 20b. By moving the multiple tag reader devices 20a, 20b, it is possible to reliably acquire the identification information and vibration determination results from each wireless tag 10 of all mechanical components 40. In particular, when the directivities of the antennas provided in the tag reader devices 20a, 20b are different from each other, the identification information and vibration determination results can be reliably acquired by moving the multiple tag reader devices.

[0168] According to the monitoring system of the fifth or sixth embodiment described above, production equipment can be monitored at a production facility such as a factory site without a maintenance inspector having to go directly to the vicinity of the machinery. Specifically, it is possible to detect signs of abnormality associated with changes in vibration and identify the bearing. For example, vibration monitoring and processing can be performed in a remote control room. Furthermore, for example, when bearings are shipped with tags packed in boxes, it is also possible to monitor the movement of the bearings to detect abnormal vibrations from the time of shipment until they are installed in machinery.

[0169] Seventh Embodiment In the first to sixth embodiments described above, monitoring systems using wireless tags have been described. Hereinafter, a maintenance management system that performs maintenance management using wireless tags will be described. FIG. 22 is a diagram showing a maintenance management system according to a seventh embodiment of the present disclosure. In FIG. 22, a maintenance management system 100d has a wireless tag 10, a tag reader device 20a, and a maintenance management device 30b. The wireless tag 10 is provided in a maintenance management object by the maintenance management system 100d. The tag reader device 20a can acquire data from the wireless tag 10. The tag reader device 20a can also write data to the wireless tag 10. The tag reader device 20a corresponds to a data acquisition device in the present disclosure.

[0170] (Wireless Tag) The wireless tag 10 includes an antenna 11, a temperature sensor 12, a control unit 13, and a power supply unit 14. The control unit 13 has a communication unit 131 and a storage unit 132. The wireless tag 10 is, for example, an RFID tag.

[0171] The antenna 11 is a transmitting and receiving antenna, i.e., the antenna 11 functions as both a transmitting antenna and a receiving antenna.

[0172] The temperature sensor 12 detects temperature. Specifically, the temperature sensor 12 detects the temperature of the maintenance management object to which the wireless tag 10 is attached. The temperature detected by the temperature sensor 12 is stored as temperature data in the memory unit 132 of the control unit 13. In other words, the temperature sensor 12 outputs temperature data corresponding to the temperature.

[0173] The communication unit 131 can receive data wirelessly via the antenna 11. The communication unit 131 can transmit data wirelessly via the antenna 11.

[0174] The storage unit 132 stores identification information 1320 for identifying the wireless tag 10 itself. The storage unit 132 also stores the temperature detected by the temperature sensor 12 as temperature data. The data stored in the storage unit 132 can be read out.

[0175] The power supply unit 14 supplies power to each component within the wireless tag 10. The power supply unit 14 is, for example, a primary battery. Because power is supplied from the power supply unit 14, the wireless tag 10 can detect temperature using the temperature sensor 12 and store the temperature data in the memory unit 132.

[0176] When a data read signal is transmitted from tag reader device 20a, wireless tag 10 reads the data stored in memory unit 132 and transmits it to tag reader device 20a. At this time, communication unit 131 of wireless tag 10 associates the temperature data with the identification information and transmits them to tag reader device 20a.

[0177] (Tag Reader Device) The tag reader device 20 a includes an antenna 21 , a control unit 22 , and a power supply unit 23 .

[0178] The antenna 21 is a transmitting and receiving antenna, i.e., the antenna 21 functions as both a transmitting antenna and a receiving antenna.

[0179] The control unit 22 has a communication unit 221, a storage unit 222, a reading unit 223, and a writing unit 224. The communication unit 221 can wirelessly transmit and receive data to and from the wireless tag 10 via the antenna 21. The communication unit 221 can also transmit and receive data to and from the maintenance management device 30b via the network NW. The tag reader device 20a can transmit temperature data from the temperature sensor 12 of the wireless tag 10 to the maintenance management device 30b.

[0180] The storage unit 222 stores data acquired by the communication unit 221. The storage unit 222 stores the temperature data and identification information acquired by the communication unit 221 in association with each other. The storage unit 222 also stores various data and programs necessary for the operation of the tag reader device 20a.

[0181] The reading unit 223 can receive data transmitted from the wireless tag 10 using the antenna 21 and the communication unit 221, and can read data stored in the wireless tag 10. This allows the tag reader device 20a to acquire data from the wireless tag 10.

[0182] The reading unit 223 can simultaneously communicate wirelessly with multiple wireless tags 10, and can simultaneously acquire temperature data from multiple wireless tags 10. At this time, the temperature data is acquired in a state in which identification information is associated with the temperature data. Therefore, the tag reader device 20a acquires the temperature data from each temperature sensor of the multiple wireless tags 10 in a relatively short time. The tag reader device 20a transmits the temperature data from the multiple temperature sensors to the maintenance management device 30b.

[0183] The writing unit 224 can transmit data to the wireless tag 10 using the antenna 21 and the communication unit 221. This allows the tag reader device 20a to write data to the wireless tag 10.

[0184] The power supply unit 23 supplies power to each unit in the tag reader device 20a. The power supply unit 23 is, for example, a primary battery.

[0185] (Maintenance Management Device) The maintenance management device 30b includes a communication unit 31, a memory unit 32, a control unit 33, a power supply unit 34, a display unit 35, and an input unit 36. The communication unit 31 can transmit and receive data to and from the tag reader device 20a via the network NW. The maintenance management device 30b may be provided near the tag reader device 20a or in a remote location.

[0186] The memory unit 32 stores data acquired by the tag reader device 20a from the wireless tag 10. The memory unit 32 corresponds to the acquired data memory unit in the present disclosure. The control unit 33 includes, for example, a central processing unit (CPU), a read-only memory (ROM), a random access memory (RAM), an input interface, and an output interface (not shown). The CPU, ROM, and RAM are connected via an internal bus (not shown). Programs such as a BIOS are stored in the ROM. The CPU realizes various functions by executing programs stored in the ROM or the memory unit 32 while using the RAM as a work area. The control unit 33 can perform editing, such as classification and rearrangement, on the data stored in the memory unit 32. The control unit 33 determines whether the temperature data stored in the memory unit 32 is equal to or greater than a predetermined threshold. As will be described later, the control unit 33 has the function of a determination unit of the present disclosure. The power supply unit 34 supplies power to each unit of the maintenance management device 30b.

[0187] The display unit 35 is a unit that displays various data to a person in charge of maintenance management. The display unit 35 can display, for example, data that the control unit 33 reads from the storage unit 32. The input unit 36 ​​is a unit that allows the person in charge of maintenance management to input data, and is, for example, a keyboard or a mouse.

[0188] (Example of a maintenance management target) Fig. 23 is a diagram showing an example of a maintenance management target by a maintenance management system. Fig. 23 is a diagram showing a case where a mechanical device 200 is a maintenance management target. A mechanical component 40 in Fig. 23 is the same as the mechanical component 40 described with reference to Fig. 3.

[0189] Tag reader device 20a moves in the vicinity of mechanical device 200. Tag reader device 20a moves to a position where it can transmit and receive signals to and from wireless tag 10. That is, tag reader device 20a acquires data from wireless tag 10 while patrolling. Tag reader device 20a moves, for example, along a track such as a rail provided on the floor or ceiling of a room in which mechanical device 200 is installed. Alternatively, tag reader device 20a may move along a predetermined path on the floor without a track. For example, tag reader device 20a may be provided with a motor, and a program for controlling the motor to move autonomously along a predetermined path may be stored in memory unit 222. Then, control unit 22 may read and execute the program.

[0190] 22 , the identification information and temperature data acquired from each wireless tag 10 are stored in the storage unit 222 and then sent to the maintenance management device 30b via the network NW. The maintenance management device 30b stores the identification information and temperature data in the storage unit 32. The control unit 33 can edit the data stored in the storage unit 32, such as by classifying or rearranging the data.

[0191] The temperature sensor 12 of each wireless tag 10 detects the temperature, for example, at a predetermined cycle. For example, the temperature sensor 12 detects the temperature once a day at a set time. Alternatively, the temperature sensor 12 may detect the temperature at predetermined intervals. For example, the temperature sensor 12 may detect the temperature every hour, every 30 minutes, every minute, or every 30 seconds.

[0192] The identification information and temperature data may be transmitted to the tag reader device 20a each time the wireless tag 10 detects a temperature, or may be transmitted in bulk to the tag reader device 20a when the amount of data stored in the memory unit 132 of the wireless tag 10 reaches a predetermined amount. In the former case, the maintenance management process can be carried out more quickly. In the latter case, transmitting the data in bulk can reduce consumption of the power supply unit 14. As described above, the maintenance management system can obtain temperature data for each maintenance management target identified by the obtained identification information and monitor for abnormalities in the temperature data.

[0193] (Operation Example) Fig. 24 is a flowchart showing an operation example of the maintenance management system 100d according to the seventh embodiment. Fig. 24 shows the operations of the wireless tag 10, tag reader device 20a, and maintenance management device 30b of the maintenance management system 100d.

[0194] In FIG. 24, steps S101 to S106 show an example of the operation of the wireless tag 10, steps S201 to S204 show an example of the operation of the tag reader device 20a, and steps S301 to S302 show an example of the operation of the maintenance management device 30b.

[0195] In FIG. 24, the wireless tag 10 acquires temperature data from the temperature sensor 12 in advance (step S101) and stores the data in the storage unit 132 (step S102).

[0196] Thereafter, when a data read signal is transmitted from tag reader device 20a to wireless tag 10 (step S201), wireless tag 10 receives the read signal (step S103). Wireless tag 10 then acquires temperature data from temperature sensor 12 (step S104) and reads the identification information stored in memory unit 132 (step S105). Wireless tag 10 transmits the temperature data together with the identification information (step S106), which tag reader device 20a receives (step S202).

[0197] The tag reader device 20a stores the received temperature data and identification information in the storage unit 222 (step S203). Thereafter, the tag reader device 20a transmits the temperature data and identification information (step S204), which the maintenance management device 30b receives (step S301). The maintenance management device 30b stores the received temperature data and identification information in the storage unit 32 (step S302). Through the above processing, the maintenance management device 30b can acquire the temperature data and identification information and can perform editing, such as classification and rearrangement, on the data stored in the storage unit 32. The maintenance management device 30b can monitor the maintenance management target by utilizing the data stored in the storage unit 32.

[0198] Fig. 25 is a flowchart showing a first example of the processing in the control unit 33 of the maintenance management device 30b in Fig. 22. The control unit 33 executes a program stored in the storage unit 32 to perform the following processing.

[0199] 25 , the control unit 33 reads out temperature data stored in the memory unit 32 (step S311). The control unit 33 displays the read temperature data on the display unit 35 (step S312). The control unit 33 determines whether each temperature data displayed on the display unit 35 is equal to or greater than a predetermined first threshold (step S313). If the result of the determination in step S313 is that the temperature data is equal to or greater than the first threshold (Yes in step S313), the control unit 33 changes the display mode of the temperature data (step S314). In other words, the unique data that is equal to or greater than the first threshold is displayed in a different mode from the other temperature data. Thereafter, the other temperature data is processed (step S315), and the above process is repeated.

[0200] On the other hand, if the result of the determination in step S313 is that the temperature is not equal to or greater than the first threshold (No in step S313), the display mode of that temperature data is not changed (step S316).Then, other temperature data is processed (step S315), and the above process is repeated.

[0201] As described above, by changing the display mode of temperature data that is equal to or greater than the first threshold, a person in charge of maintenance can easily recognize the managed object corresponding to the abnormal temperature data, and can promptly carry out maintenance management such as repairs, maintenance, etc. Therefore, according to the maintenance management system of the seventh embodiment, it is possible to monitor abnormalities in the temperature data for each managed object identified by the acquired identification information.

[0202] (Example of Temperature Data) Fig. 26 is a diagram showing an example of data acquired by tag reader device 20 from wireless tag 10. Fig. 26 shows temperature data transmitted from tag reader device 20 to maintenance management device 30b and stored in memory unit 32. The temperature data is displayed as a list on the screen of display unit 35, as shown in Fig. 26.

[0203] 26, the RFID identification information "rfid0001", "rfid0002", etc. are associated with other data and stored in the storage unit 32. For example, the identification information "rfid0001" is associated with the acquisition time (i.e., year, month, day, hour, minute), the serial number (s / n) which is the bearing's identification information (ID), and the measured temperature, i.e., temperature data. In this example, the identification information is further associated with the date and details of the previous maintenance (e.g., grease refill, checklist included), the date and details of the next recommended maintenance, the date of operation start, the date and details of the past maintenance history, and the device name, unit name, and measured temperature which are device information.

[0204] Of the data shown in Fig. 26, the RFID identification information, acquisition time, bearing serial number, and measured temperature data (range H1 in Fig. 26) are data obtained from the wireless tag 10. In contrast, the date and details of the previous maintenance, the date and details of the next recommended maintenance, the date of operation start, the date and details of the past maintenance history, and the device information, such as the device name, unit name, and measured temperature data (range H2 in Fig. 26), are data for maintenance management.

[0205] Of the data shown in FIG. 26 , the display mode of the measured temperature 351, which is temperature data, is changed based on the result of comparison with the first threshold, as described with reference to FIG. 25 . For example, a measured temperature equal to or greater than the first threshold is highlighted by changing the display color, increasing the display brightness, or flashing. Changing the display mode can alert a maintenance manager. Note that in FIG. 26 , differences in display color are expressed by shading or the like.

[0206] In the example shown in FIG. 26 , a different display color is used for measured temperatures of 70° C. or higher. Note that in the example shown in FIG. 26 , a different display color may be used for measured temperatures of 80° C. or higher, which are higher than 70° C. If several first threshold values ​​are prepared and each is compared and determined in step S313 in FIG. 25 , it is possible to realize a multi-level warning. For example, by displaying 70° C. or higher in yellow and 80° C. or higher in red, it is possible to intuitively understand the high temperature.

[0207] The unit name is information for identifying the shaft member described with reference to Fig. 23. For example, it is "Shaft 1-1", "Shaft 1-2", "Shaft 1-3", "Shaft 1-4", "Shaft 2-1", "Shaft 2-2", "Shaft 3-1", "Shaft 3-2", "Shaft 3-3", and "Shaft 3-4".

[0208] The temperature measurement results of each shaft member can be displayed, for example, by a bar graph, as described with reference to FIG. 7. That is, the maintenance management device 30b can edit each data shown in FIG. 26 and display it as a bar graph on a screen (not shown), as already described with reference to FIG. 7. The bar graph shown in FIG. 7 displays temperature data horizontally. Since the bar graph is displayed horizontally according to the arrangement of the maintenance management objects, the person performing maintenance management can intuitively recognize the arrangement of the maintenance management objects. In the bar graph shown in FIG. 7, the display colors are changed for "Axis 1-1" and "Axis 3-1" which are 70°C or higher, and "Axis 2-1" which is 80°C or higher.

[0209] Furthermore, the temperature measurement results of each shaft member can be displayed, for example, as already explained with reference to FIG. 8. The explanation will be made again with reference to FIG. 8. FIG. 8 is a diagram showing an example of the temperature measurement results of axis 2-1. When a maintenance manager performs a predetermined operation in the display state of FIG. 7, the control unit 33 transitions to the display state of FIG. 8. For example, when the mouse cursor is moved to the bar graph area of ​​axis 2-1 and clicked, the display transitions to the display state of FIG. 8, which shows detailed content of the temperature data of axis 2-1.

[0210] FIG. 8 shows the average value of temperature data for axis 2-1 over a certain period (for example, one day). In the example shown in FIG. 8, temperature measurements are not taken on non-working days such as "May 1st," so there is no temperature data for non-working days. Referring to FIG. 8, it can be seen that the temperature of axis 2-1 is high on "May 8th." This allows maintenance managers to quickly carry out maintenance such as repairs.

[0211] Eighth Embodiment In the seventh embodiment described above, the determination is made by comparing each temperature data with the first threshold value. In the eighth embodiment described below, the determination is made based on the temperature difference between the temperature data from wireless tags in adjacent positions. The other configurations and processing contents are the same as those in the seventh embodiment.

[0212] Fig. 27 is a flowchart showing a second example of the processing in the control unit 33 of the maintenance management device 30b in Fig. 22. The control unit 33 executes a program stored in the storage unit 32 to perform the following processing.

[0213] 27, the control unit 33 reads out temperature data stored in the memory unit 32 (step S311). The control unit 33 displays the read temperature data on the display unit 35 (step S312). For each piece of temperature data displayed on the display unit 35, the control unit 33 calculates the difference between the temperature data from the wireless tag at the adjacent position (step S321).

[0214] The control unit 33 determines whether the difference calculated in step S321 is equal to or greater than a predetermined second threshold (step S322). If the result of the determination in step S322 is that the difference is equal to or greater than the second threshold (Yes in step S322), the control unit 33 changes the display mode of the higher temperature data among the temperature data for which the difference was calculated (step S323). In other words, the unique data that is equal to or greater than the second threshold is displayed in a different mode from the other temperature data. Thereafter, the other temperature data is processed (step S315), and the above process is repeated.

[0215] On the other hand, if the result of the determination in step S322 is that the temperature is not equal to or greater than the second threshold (No in step S322), the display mode of that temperature data is not changed (step S316).Then, other temperature data is processed (step S315), and the above process is repeated.

[0216] As described above, by changing the display mode of temperature data that is equal to or greater than the second threshold value with respect to the difference from the temperature data of adjacent positions, a person in charge of maintenance can easily recognize the managed object corresponding to the abnormal temperature data, and can promptly carry out maintenance management such as repairs. Therefore, the maintenance management system of the second embodiment can monitor abnormalities in the temperature data for each managed object identified by the acquired identification information.

[0217] Ninth Embodiment Fig. 28 is a diagram showing a maintenance management system according to a ninth embodiment of the present disclosure. In Fig. 28, in a maintenance management system 100e, a control unit 33a of a maintenance management device 30c has a calculation unit 331. The calculation unit 331 calculates the average value of temperature data. In the seventh embodiment described above, a determination is made by comparing each temperature data with a first threshold value. In the maintenance management system 100e of the ninth embodiment, a determination is made based on the difference from the average value of the temperature data. The other configurations and processing contents are the same as those of the seventh embodiment.

[0218] Fig. 29 is a flowchart showing a third example of the processing in the control unit 33 of the maintenance management device 30c in Fig. 28. The control unit 33 executes a program stored in the storage unit 32 to perform the following processing.

[0219] 29 , the control unit 33 reads out the temperature data stored in the memory unit 32 (step S311). The control unit 33 displays the read-out temperature data on the display unit 35 (step S312). The control unit 33 calculates an average value for each temperature data displayed on the display unit 35 (step S331). The process of calculating the average value in step S331 corresponds to the process of the calculation unit in the present disclosure.

[0220] The control unit 33 determines whether the difference from the average value calculated in step S331 is equal to or greater than a predetermined third threshold (step S332). If the result of the determination in step S332 is that the difference from the average value is equal to or greater than the third threshold (Yes in step S332), the control unit 33 changes the display mode of the temperature data (step S314). That is, the unique data that is equal to or greater than the third threshold is displayed in a different mode from the other temperature data. Thereafter, the other temperature data is processed (step S315), and the above process is repeated.

[0221] On the other hand, if the result of the determination in step S322 is that the difference from the average value is not equal to or greater than the third threshold (No in step S332), the display mode of that temperature data is not changed (step S316).Then, other temperature data is processed (step S315), and the above process is repeated.

[0222] As described above, by changing the display mode of temperature data that is equal to or greater than the third threshold value with respect to the difference from the average temperature data, it is possible to easily extract temperature data that deviates from the average temperature data. This allows a maintenance manager to easily identify the management target corresponding to abnormal temperature data and quickly perform maintenance management such as repairs. Therefore, the maintenance management system of the third embodiment can monitor abnormalities in the temperature data for each management target identified by the acquired identification information.

[0223] (Modifications) In the above embodiments, the temperature data is displayed using a bar graph, but it may be displayed in other display formats, such as a pie chart or a line graph.

[0224] DESCRIPTION OF SYMBOLS 1-1 to 1-4, 2-1, 2-2, 3-1 to 3-4 Shaft 10, 10a, 10b, 10c Wireless tag 11, 21 Antenna 12 Temperature sensor 12a Acceleration sensor 13, 22, 33, 33a Control unit 14, 23, 34 Power supply unit 15, 15a Determination unit 20, 20', 20a, 20a', 20b, 20b' Tag reader device 24 Motor 30, 30a Monitoring terminal device 30b, 30c Maintenance management device 31, 131, 221 Communication unit 32, 132, 222 Memory unit 35 Display unit 36 ​​Input unit 37 Alarm unit 40 Machine part 41 Shaft member 42 Bearing 43 Through hole 44a, 44b Hole portion 50 Roller member 60 Roller device 70 Support base 100, 100a, 100b, 100c Monitoring system 100d, 100e Maintenance management system 151 Comparator 200, 200a, 200b, 200c Mechanical device 223 Reading unit 224 Writing unit 225 Driving unit 331 Calculation unit 351 Measured temperature 1320 Identification information R1, R2 Resistor

Claims

1. A monitoring system including a wireless tag attached to a monitored object and a mobile data acquisition device that acquires data from the wireless tag, wherein the wireless tag has a memory unit that stores identification information and a communication unit that transmits the identification information, the data acquisition device moves in the vicinity of the wireless tag, and the data acquisition device stores the identification information acquired from the wireless tag as the data acquisition device moves in the vicinity of the wireless tag.

2. The monitoring system of claim 1, wherein the wireless tag further has a temperature sensor that detects the temperature of the monitored object and outputs temperature data corresponding to the temperature, the communication unit transmits the temperature data and the identification information output by the temperature sensor, and the monitoring object is monitored based on the temperature data and the identification information acquired by the data acquisition device from the wireless tag when moving near the wireless tag.

3. The monitoring system of claim 2, further comprising a plurality of said data acquisition devices, wherein said wireless tag is provided for each of said plurality of monitored objects, and wherein said identification information acquired by said plurality of data acquisition devices from said wireless tag is stored when said plurality of data acquisition devices move in the vicinity of said wireless tag.

4. A monitoring system according to claim 2 or 3, wherein the communication unit transmits the temperature data and the identification information in association with each other.

5. A monitoring system as described in any one of claims 1 to 3, further comprising a monitoring terminal device for monitoring the bearing, wherein the wireless tag is provided on the bearing, the monitoring terminal device has an acquired data storage unit for storing data acquired by the data acquisition device, and monitors the bearing based on the data stored in the acquired data storage unit.

6. The wireless tag further includes: a temperature sensor that detects the temperature of the monitored object; and a judgment unit that judges whether the temperature detected by the temperature sensor exceeds a predetermined threshold; the memory unit stores the judgment result of the judgment unit indicating that the temperature detected by the temperature sensor has exceeded the predetermined threshold and the identification information; the communication unit transmits the judgment result and the identification information; and the monitoring system described in claim 1 monitors the monitored object based on the judgment result and the identification information acquired by the data acquisition device from the wireless tag when moving in the vicinity of the wireless tag.

7. The monitoring system of claim 6, further comprising a plurality of said data acquisition devices, said wireless tag being provided for each of said plurality of monitored objects, and storing the identification information acquired by said plurality of said data acquisition devices from said wireless tag as said plurality of said data acquisition devices move in the vicinity of said wireless tag.

8. A monitoring system according to claim 6 or 7, wherein the communication unit transmits the determination result and the identification information in association with each other.

9. A monitoring system as described in claim 6 or claim 7, further comprising a monitoring terminal device for monitoring the bearing, wherein the wireless tag is provided on the bearing, the monitoring terminal device has an acquired data storage unit for storing data acquired by the data acquisition device, and monitors the bearing based on the data stored in the acquired data storage unit.

10. The monitoring system according to claim 9, wherein the monitoring terminal device further includes an alarm unit that outputs an alarm based on the result of the determination.

11. The wireless tag further includes an acceleration sensor that detects the acceleration of the monitored object, and a judgment unit that judges whether or not vibrations based on the acceleration detected by the acceleration sensor exceed a predetermined threshold, the memory unit stores a judgment result of the judgment unit and identification information indicating that vibrations based on the acceleration detected by the acceleration sensor have exceeded the predetermined threshold, and the communication unit transmits the judgment result and the identification information, and the monitoring system described in claim 1 monitors the monitored object based on the judgment result and the identification information acquired by the data acquisition device from the wireless tag when moving in the vicinity of the wireless tag.

12. The monitoring system of claim 11, comprising a plurality of the data acquisition devices, wherein the wireless tag is provided for each of the plurality of monitored objects, and wherein the identification information acquired by the plurality of data acquisition devices from the wireless tag is stored when the plurality of data acquisition devices move in the vicinity of the wireless tag.

13. A monitoring system according to claim 11 or 12, wherein the communication unit transmits the determination result and the identification information in association with each other.

14. A monitoring system as described in claim 11 or claim 12, further comprising a monitoring terminal device for monitoring the bearing, wherein the wireless tag is provided on the bearing, the monitoring terminal device has an acquired data storage unit for storing data acquired by the data acquisition device, and monitors the bearing based on the data stored in the acquired data storage unit.

15. The monitoring system according to claim 14, wherein the monitoring terminal device further includes an alarm unit that outputs an alarm based on the result of the determination.

16. A maintenance management system comprising: a plurality of wireless tags provided in the vicinity of a plurality of maintenance management objects, each having a temperature sensor for acquiring the temperature of the maintenance management objects; a data acquisition device for acquiring a plurality of temperature data from the plurality of wireless tags; a memory unit for storing the plurality of temperature data acquired by the data acquisition device; a judgment unit for judging whether the temperature data stored in the memory unit is above a predetermined threshold; and a display unit for displaying the plurality of temperature data read out from the memory unit, wherein the display unit displays, based on a judgment result of the judgment unit, those of the plurality of temperature data that are above a predetermined threshold in a manner different from other temperature data.

17. The maintenance management system according to claim 16, wherein the display unit displays the temperature data in a manner different from the other temperature data when the value of the temperature data is equal to or greater than a first threshold value based on the judgment result of the judgment unit.

18. The maintenance management system as described in claim 16, wherein the display unit displays the higher-value temperature data in a manner different from the other temperature data when the difference between the temperature data of the maintenance management object at an adjacent position is equal to or greater than a second threshold value based on the judgment result of the judgment unit.

19. A maintenance management system as described in claim 16, further comprising a calculation unit which calculates an average value, and wherein the display unit displays the temperature data in a manner different from the other temperature data when the difference between the average value and the temperature data is equal to or greater than a third threshold value based on the judgment result of the judgment unit.

20. A maintenance management system as described in any one of claims 16 to 19, wherein the display unit displays the plurality of temperature data using a bar graph, and among the temperature data displayed using the bar graph, temperature data that is displayed in a manner different from the other temperature data is displayed in a color different from the display color of the other temperature data.