WO2017104223A1 - Sensor system and sensor unit - Google Patents

Sensor system and sensor unit Download PDF

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Publication number
WO2017104223A1
WO2017104223A1 PCT/JP2016/079029 JP2016079029W WO2017104223A1 WO 2017104223 A1 WO2017104223 A1 WO 2017104223A1 JP 2016079029 W JP2016079029 W JP 2016079029W WO 2017104223 A1 WO2017104223 A1 WO 2017104223A1
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WO
WIPO (PCT)
Prior art keywords
sensor unit
fastening member
sensor
permanent magnet
abnormality
Prior art date
Application number
PCT/JP2016/079029
Other languages
French (fr)
Japanese (ja)
Inventor
武史 佐藤
隆之 堀邉
伸充 天知
Original Assignee
株式会社村田製作所
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Filing date
Publication date
Application filed by 株式会社村田製作所 filed Critical 株式会社村田製作所
Publication of WO2017104223A1 publication Critical patent/WO2017104223A1/en

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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16B—DEVICES FOR FASTENING OR SECURING CONSTRUCTIONAL ELEMENTS OR MACHINE PARTS TOGETHER, e.g. NAILS, BOLTS, CIRCLIPS, CLAMPS, CLIPS OR WEDGES; JOINTS OR JOINTING
    • F16B31/00—Screwed connections specially modified in view of tensile load; Break-bolts
    • F16B31/02—Screwed connections specially modified in view of tensile load; Break-bolts for indicating the attainment of a particular tensile load or limiting tensile load
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
    • G01L5/00—Apparatus for, or methods of, measuring force, work, mechanical power, or torque, specially adapted for specific purposes
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
    • G01L5/00—Apparatus for, or methods of, measuring force, work, mechanical power, or torque, specially adapted for specific purposes
    • G01L5/24—Apparatus for, or methods of, measuring force, work, mechanical power, or torque, specially adapted for specific purposes for determining value of torque or twisting moment for tightening a nut or other member which is similarly stressed

Definitions

  • the present invention relates to a sensor system and a sensor unit.
  • bolts anchor bolts, bolts and nuts
  • These bolts and the like may be loosened or broken by continuing to receive vibrations associated with wind and traffic. In this case, the fastening force of the bolts or the like is lost, and there is a risk that the structure may be detached from other structures.
  • the fastening force of the bolts or the like is lost, and there is a risk that the structure may be detached from other structures.
  • the other bolts are also loosened in a chained manner, and the abnormality spreads. If left unattended, it can lead to a major accident.
  • Patent Documents 1 and 2 disclose a system for detecting and reporting an abnormality in a fastening state of a bolt or the like by passing a sensor wire through a hole formed in the bolt or the like, and the wire is cut when the bolt or the like is pulled out. ing.
  • Patent Document 1 does not always allow an inspector to easily visually check the looseness of all bolts from the outside, and the inspector needs to perform frequent inspections. Is difficult. Therefore, it is desired to develop a technique for automatically detecting and reporting an abnormality when a bolt or the like is loosened.
  • an abnormality such as a bolt can be detected when the bolt or the like is removed using a tool, or when the bolt is completely dropped. In some cases, abnormalities cannot be detected. Therefore, even if the bolts are loosened and the fastening force is lost, there is a risk of not being notified.
  • an object of the present invention is to provide a sensor unit and a sensor system that can accurately detect an abnormality in a fastening state of a fastening member by a simple method.
  • one aspect of a sensor system is a sensor system for detecting an abnormality in a fastening state of a fastening member, wherein the sensor system includes a magnetic product that generates magnetism, A sensor unit for detecting the magnetism corresponding to the distance to the magnetic generation object and detecting an abnormality in the fastening state of the fastening member from the detected magnitude of the magnetism and a predetermined threshold value;
  • One of the object and the sensor unit is fixed to the fastening member, and moves so that the distance between the magnetic product and the other of the sensor unit changes based on the operation of the fastening member.
  • the magnetic product or the sensor unit fixed to the fastening member also moves based on the operation of the fastening member. Accordingly, the magnitude of magnetism detected by the sensor unit changes in accordance with the distance between the magnetic generation product and the sensor unit. By detecting this magnetism, the looseness of the fastening member can be detected.
  • the presence or absence of an abnormality in the fastening state of the fastening member is determined by comparing the magnitude of magnetism detected by the sensor unit with a predetermined threshold, the abnormality in the fastening state of the fastening member can be accurately detected by a simple method. Can be detected.
  • the magnetic product may be a permanent magnet.
  • one aspect of a sensor unit according to the present invention is a sensor unit used in a sensor system having the above-described features, wherein the sensor unit includes a sensor unit that detects the magnetism. And a determination unit that determines whether or not there is an abnormality in the fastening state of the fastening member by comparing the magnitude of the magnetism detected by the sensor unit with the threshold value.
  • the presence / absence of abnormality in the fastening state of the fastening member can be easily determined by comparing the magnitude of the magnetism detected by the sensor unit with the threshold value.
  • the determination unit may determine that the fastening state of the fastening member is abnormal when the magnitude of the magnetism detected by the sensor unit is smaller than the threshold value.
  • the fastening member is a bolt or nut in which a thread is formed, and the thickness of the sensor portion is formed such that the sum of the thickness of the magnetic product and the lead length of the thread is smaller. It may be.
  • the sensor unit may be installed such that a lower end of the sensor unit is positioned higher than a height corresponding to a thickness of the magnetic product from a reference plane.
  • the sensor unit and the permanent magnet do not face each other, so the sensor unit detects magnetism generated from the permanent magnet. Therefore, it is possible to detect an abnormality that the permanent magnet or the sensor unit fixed to the fastening member has fallen off from the fastening member.
  • a transmission unit that transmits the presence / absence of abnormality in the fastening state of the fastening member determined by the determination unit may be further provided.
  • the present invention it is possible to provide a sensor unit and a sensor system that can accurately detect an abnormality in a fastening state of a fastening member by a simple method.
  • FIG. 1 is a block diagram of the configuration of the sensor system according to the first embodiment.
  • FIG. 2 is a schematic diagram illustrating the configuration of the sensor system according to the first embodiment, where (a) is a plan view and (b) is a front view.
  • FIG. 3A is a plan view illustrating an example of an abnormality in a fastening state detected by the sensor system according to the first embodiment.
  • FIG. 3B is a plan view illustrating another example of the abnormality in the fastening state detected by the sensor system according to the first embodiment.
  • FIG. 4 is a flowchart of a procedure for detecting an abnormality in the fastening state by the sensor system according to the first embodiment.
  • FIG. 5 is a schematic diagram illustrating a configuration of a sensor system according to the second embodiment, where (a) is a plan view and (b) is a front view.
  • FIG. 6A is a front view illustrating an example of an abnormality in a fastening state detected by the sensor system according to the second embodiment.
  • FIG. 6B is a front view illustrating another example of the abnormality in the fastening state detected by the sensor system according to the second embodiment.
  • FIG. 7 is a block diagram of the configuration of the sensor system according to the third embodiment.
  • FIG. 8 is a schematic diagram illustrating the configuration of the sensor system according to the third embodiment, where (a) is a plan view and (b) is a front view seen through the sensor unit through a cap.
  • FIG. 9 is a schematic diagram illustrating details of the configuration of the sensor system according to the third embodiment, where (a) is a front view of the sensor unit, and (b) is a plan view of the sensor unit as viewed from the inner lid side. (C) is a top view of the fastening member when viewed from the inner lid side.
  • FIG. 1 is a block diagram showing a configuration of a sensor system 1 according to the present embodiment.
  • 2A and 2B are schematic views showing the configuration of the sensor system 1, wherein FIG. 2A is a plan view and FIG. 2B is a front view.
  • the sensor system 1 includes a sensor unit 10 and a magnetic product 20.
  • One of the magnetic product 20 and the sensor unit 10 is fixed to the fastening member 22 so that the distance between the magnetic product 20 and the other of the sensor unit 10 changes based on the operation of the fastening member 22.
  • Moving. 1 and 2 show an example in which the magnetic product 20 is fixed to the fastening member 22.
  • the sensor unit 10 includes a sensor unit 11, a determination unit 12, a communication circuit unit 13, an antenna unit 14, and a battery 15.
  • the sensor unit 11, the determination unit 12, the communication circuit unit 13, the antenna unit 14, and the battery 15 are disposed on the substrate 17 and covered with a waterproof case 18.
  • a wiring (not shown) for connecting the sensor unit 11, the determination unit 12, the communication circuit unit 13, the antenna unit 14, and the battery 15 is formed on the substrate 17.
  • the sensor unit 10 detects magnetism corresponding to the distance to the magnetic product 20 and detects an abnormality in the fastening state of the fastening member 22 from the detected magnitude of the magnetism and an abnormality detection threshold described in detail later.
  • the sensor unit 11 is, for example, a magnetic sensor using a Hall element, and detects magnetism generated from a magnetic generator 20 described later.
  • the magnetic sensor is not limited to a configuration using a Hall element, but may be any magnetic sensor having directivity, and may be another configuration such as a configuration using a coil.
  • the determination unit 12 is configured by, for example, a computer or a microcomputer.
  • the determination unit 12 determines the presence / absence of abnormality in the fastening state of the fastening member 22 by comparing the magnitude of magnetism detected by the sensor unit 11 with an abnormality detection threshold described in detail later.
  • the abnormality in the fastening state referred to here means, for example, a state where the nut 22b is loose with respect to the bolt 22a or the bolt 22a is broken.
  • the communication circuit unit 13 transmits a transmission signal for notifying the user of the abnormality in the fastening state to the antenna unit 14. .
  • the antenna unit 14 transmits a transmission signal transmitted from the communication circuit unit 13 for notifying whether there is an abnormality in the fastening state to a computer (not shown) for notifying the user of the abnormality. Thereby, the user can know the abnormality of the fastening state of the fastening member 22.
  • the communication circuit unit 13 and the antenna unit 14 correspond to the communication unit in the present invention.
  • the battery 15 is a voltage source for operating the sensor unit 10.
  • the drive voltage is applied to the communication device or the like (not shown) arranged in the communication circuit unit 13 by the battery 15.
  • the magnetic product 20 is, for example, a permanent magnet 21.
  • the permanent magnet 21 is made of ferrite, for example.
  • the permanent magnet 21 is fixed to the side surface of the fastening member 22 where an abnormality is to be detected by a magnetic force. Thereby, the permanent magnet 21 moves so that the distance between the permanent magnet 21 and the sensor unit 10 changes based on the operation of the fastening member 22.
  • 2A and 2B show examples of the bolt 22a and the nut 22b as the fastening member 22.
  • the permanent magnet 21 is fixed to the nut 22b by magnetic force, and when the nut 22b rotates, the permanent magnet 21 also rotates together with the nut 22b.
  • the magnetic product 20 is not limited to a permanent magnet, and may be another magnetic product such as an electromagnet.
  • the fastening member 22 is formed of a metal that is magnetized by the permanent magnet 21.
  • the fastening member 22 is made of iron.
  • the fastening member 22 is, for example, a bolt 22a and a nut 22b, and a screw thread may be formed on the bolt 22a and the nut 22b. Further, it may be a caulking in which no thread is formed.
  • the fastening member 22 is only required to be formed of a metal whose magnet is fixed to at least the permanent magnet 21.
  • the nut 22b is magnetized. It is sufficient if it is formed by.
  • fastening member 22 itself may be formed with the permanent magnet. In this case, since the fastening member 22 becomes the magnetic product 20, it is not necessary to separately provide a permanent magnet on the nut 22b.
  • FIG. 3A and FIG. 3B are plan views showing examples of abnormality in the fastening state detected by the sensor system 1.
  • the position of the permanent magnet 21 rotates together with the nut 22b, so the distance between the sensor unit 11 and the permanent magnet 21 increases.
  • the magnetism by the permanent magnet 21 detected by the sensor unit 11 decreases.
  • the sensor system 1 detects this state that the fastening state of the fastening member 22 is abnormal.
  • the broken portion of the bolt 22a and the nut 22b to which the permanent magnet 21 is fixed are within a range in which the sensor unit 11 can completely detect magnetism. No longer exists.
  • the sensor system 1 detects this state as an abnormality.
  • FIG. 4 is a flowchart showing a procedure for detecting the magnetic product 20 by the sensor system 1.
  • the sensor unit 10 is installed.
  • the sensor unit 10 is installed by bonding the substrate 17 to a structure with, for example, an adhesive.
  • the sensor unit 10 is installed at a position where the permanent magnet 21 attached to the nut 22b and the sensor unit 11 face each other with a predetermined interval (step S11).
  • step S12 magnetic reading is performed by the first sensor unit 11 (step S12). While the sensor unit 10 is installed, the sensor unit 11 reads the magnitude of magnetism present on the spot.
  • the permanent magnet 21 is installed (step S13).
  • the permanent magnet 21 is fixed by a magnetic force at a position facing the sensor unit 11 and closest to the sensor unit 11 in the nut 22b. In this state, magnetic reading is performed by the sensor unit 11 for the second time (step S14).
  • the permanent magnet 21 may be fixed by a method such as bonding to the nut 22b with an adhesive or embedding in a recess (not shown) formed in the nut 22b. Further, the position where the permanent magnet 21 is fixed is not limited to the position facing the sensor unit 11 and closest to the sensor unit 11 in the nut 22b, but may be a position not facing the nut 22b.
  • a predetermined value between the reading values read in the magnetic reading by the first and second sensor portions 11 is set as an abnormality detection threshold (step S15).
  • an intermediate value between the magnetic reading value by the first sensor unit 11 and the magnetic reading value by the second sensor unit 11 is set as the abnormality detection threshold.
  • the abnormality detection threshold corresponds to a predetermined threshold in the present invention.
  • the magnitude of magnetism output from the permanent magnet 21 by the sensor unit 11 is read by the determination unit 12, and the magnetism reading value of the permanent magnet 21 read by the sensor unit 11 is compared with the set abnormality detection threshold value. Then, whether or not the fastening member 22 has an abnormality in the fastening state is determined (step S16).
  • the determination unit 12 determines that the position of the permanent magnet 21 is not changed and the nut 22b is not loose when the magnetic reading value of the permanent magnet 21 read by the sensor unit 11 is equal to or greater than the set abnormality detection threshold. To do. Further, when the magnetism reading value of the permanent magnet 21 read by the sensor unit 11 is smaller than the set abnormality detection threshold, the determination unit 12 changes the position of the permanent magnet 21 and the nut 22b is loose. judge.
  • the influence of magnetization can be excluded.
  • variation in the installation position of the permanent magnet 21 and the sensor unit 10 is shown. Can be excluded.
  • the position where the permanent magnet 21 is fixed is not limited to the position facing the sensor unit 11 and closest to the sensor unit 11 in the nut 22b, and may be a position not facing the nut 22b.
  • the determination unit 12 does not change the position of the permanent magnet 21 and the nut 22b is loosened.
  • the magnetic reading value of the permanent magnet 21 read by the sensor unit 11 is larger than the set abnormality detection threshold, it is determined that the position of the permanent magnet 21 has changed and the nut 22b is loose. May be.
  • the determination unit 12 sets an abnormality detection threshold, and an abnormality in which the magnetic reading value of the permanent magnet 21 read by the sensor unit 11 is set. If it is smaller than the detection threshold, the bolt 22a is not broken. If the magnetic reading value of the permanent magnet 21 read by the sensor unit 11 is equal to or greater than the set abnormality detection threshold, the bolt 22a is broken. It may be determined that Further, it may be determined that the bolt 22a is broken when the sensor unit 11 cannot read magnetism regardless of whether or not the abnormality detection threshold is set.
  • the sensor unit 10 checks the presence or absence of an abnormality in the fastening state of the nut 22b by the sensor unit 11 at a predetermined time interval, for example, every hour.
  • the transmission signal to be transmitted is transmitted by the communication circuit unit 13 and the antenna unit 14.
  • communication from the sensor unit 10 to the user may be periodically performed once a day. In this case, if there is no regular communication, it may be determined that the operation of the sensor unit 10 is abnormal on the receiver side (not shown).
  • the magnetic product 20 fixed to the fastening member 22 is also the fastening member. It moves based on 22 operations. Accordingly, the magnitude of magnetism detected by the sensor unit 10 changes in accordance with the distance between the magnetic product 20 and the sensor unit 10. By detecting this magnetism, looseness of the fastening member 22 can be detected.
  • the fastening state of the fastening member 22 can be determined by a simple method. Can be accurately detected.
  • FIG. 5 is a schematic diagram illustrating a configuration of the sensor system according to the present embodiment, where (a) is a plan view and (b) is a front view.
  • FIG. 6A and FIG. 6B are plan views showing examples of abnormality in the fastening state detected by the sensor system.
  • the sensor system according to the present embodiment is different from the sensor system 1 shown in the first embodiment in that the fastening member is loosened and rotates N times, and the permanent magnet is disposed again at a position facing the sensor unit. However, it is a point which can detect the abnormality of a fastening state.
  • the sensor system includes a sensor unit 30 and a magnetic product 40.
  • the sensor unit 30 includes a sensor unit 31, a determination unit 12, a communication circuit unit 13, an antenna unit 14, and a battery 15. Since the determination unit 12, the communication circuit unit 13, the antenna unit 14, and the battery 15 have the same configuration as the sensor unit described in the first embodiment, detailed description thereof is omitted.
  • the sensor part 31 is arrange
  • the sensor unit 31 is arranged at a predetermined height from the substrate 17 via the support unit 32 as shown in FIG.
  • the magnetic product 40 is, for example, a permanent magnet 41.
  • the permanent magnet 41 is fixed to the fastening member 42 via a cover 43 by adhesion.
  • 5A and 5B show an example of the bolt 42a and the nut 42b as the fastening member 42.
  • FIG. the thickness of the sensor portion 31 is formed such that the sum of the thickness of the permanent magnet 41 is smaller than the lead length of the thread of the bolt 42a and the nut 42b. That is, the sum of the thickness of the sensor unit 31 and the thickness of the permanent magnet 41 is smaller than the lead length of the thread of the bolt 42a and the nut 42b.
  • the fastening member 42 is entirely covered with a cover 43.
  • the cover 43 is made of, for example, a soft resin such as ABS (Acrylonitrile Butadiene Styrene) resin, and partly has the same shape as the nut 42b and slightly smaller than the size of the nut 42b (not shown). Is formed.
  • the nut 42b contacts this opening.
  • the nut 42b may be fixed to the opening portion of the cover 43 or may not be fixed.
  • the size of the opening of the cover 43 may be formed to be slightly smaller than the shape of the nut 42b.
  • a permanent magnet 41 is fixed to the outside of the cover 43. As shown in FIGS. 5A and 5B, the permanent magnet 41 is fixed to the side surface of the fastening member 42 whose abnormality is to be detected via a cover 43 by adhesion. Therefore, the permanent magnet 41 fixed to the cover 43 also rotates with the rotation of the nut 42b.
  • the permanent magnet 41 is disposed at a position facing the sensor unit 31, and thus the permanent magnet 41 is arranged by the sensor unit 31.
  • the magnetism generated from the can be detected.
  • FIG. 6A when the nut 42b is loosened once and the permanent magnet 41 is disposed again at a position facing the sensor unit 31, the permanent magnet 41 faces the sensor unit 31 in the height direction. Since the sensor unit 31 is not disposed at the position, the magnetism generated from the permanent magnet 41 cannot be detected. Therefore, it is possible to detect an abnormality in the fastening state in which the nut 42b is loose with respect to the bolt 42a.
  • the sensor unit 31 and the permanent magnet 41 are formed so that the sum of the thickness of the sensor unit 31 and the thickness of the permanent magnet 41 is smaller than the lead length of the bolt 42a and the nut 42b thread.
  • the thickness may be such that an abnormality in the fastening state of the fastening member 42 can be detected when N rotations are performed. Thereby, even if the nut 42b is loosened and rotates N times and the permanent magnet 41 disposed at the position facing the sensor unit 31 is disposed again at the position facing the sensor unit 31, an abnormality in the fastening state is detected. can do.
  • the thickness in the height direction of the sensor unit 31 is thinner than the thickness in the height direction of the permanent magnet 41, and the lower end (distance from the substrate 17) of the arrangement position of the sensor unit 31 is based on the substrate 17. You may arrange
  • FIG. 7 is a block diagram showing a configuration of the sensor system 100 according to the present embodiment.
  • FIG. 8 is a schematic diagram illustrating the configuration of the sensor system 100 according to the present embodiment, where (a) is a plan view and (b) is a front view seen through the sensor unit 110 through a cover 130. In FIG. 8B, the configuration of the sensor unit is shown through.
  • FIG. 9 is a schematic diagram showing details of the configuration of the sensor system 100 according to the present embodiment, where (a) is a front view of the sensor unit 110, and (b) is the sensor unit 110 when viewed from the inner lid 135 side.
  • FIG. 6C is a plan view of the fastening member 122 when viewed from the inner lid 135 side.
  • the sensor system 100 according to the present embodiment is different from the sensor system 1 shown in the first embodiment in that the sensor unit 110 is fixed to the fastening member 122 instead of the permanent magnet 121.
  • the sensor system 100 includes a sensor unit 110 and a magnetic product 120.
  • the sensor unit 110 includes a sensor unit 111, a determination unit 112, a communication circuit unit 113, an antenna unit 114, and a battery 115, like the sensor unit 10 shown in the first embodiment.
  • the determination unit 112, the communication circuit unit 113, the antenna unit 114, and the battery 115 are disposed on the substrate 117. Further, wiring (not shown) for connecting the determination unit 112, the communication circuit unit 113, the antenna unit 114, and the battery 115 is formed on the substrate 117.
  • the sensor unit 111, the determination unit 112, the communication circuit unit 113, the antenna unit 114, and the battery 115 are configured in the sensor unit 11, the determination unit 12, the communication circuit unit 13, the antenna unit 14, and the battery unit 115 described in the first embodiment. Since it is the same as the battery 15, detailed description is abbreviate
  • the magnetic generator 120 is composed of, for example, a permanent magnet 121. Since the configuration of the permanent magnet 121 is the same as that of the permanent magnet 21 shown in the first embodiment, detailed description thereof is omitted.
  • the fastening member 122 is comprised by the bolt 122a and the nut 122b, for example like the fastening member 22 shown in Embodiment 1.
  • FIG. The fastening member 122 includes a cover 130.
  • the cover 130 is made of a soft resin such as ABS resin.
  • the cover 130 covers the fastening member 122 and incorporates the sensor unit 110. That is, the fastening member 122 and the sensor unit 110 are enclosed in the cover 130.
  • the sensor unit 110 and the fastening member 122 are incorporated in the cover 130.
  • an arrow 131 serving as a mark indicating a position where the sensor unit 111 exists inside the cover 130 is provided on the outside of the cover 130.
  • the arrow 131 is provided at a position facing the permanent magnet 121 so that the tip of the arrow faces the permanent magnet 121.
  • the arrow 131 may be, for example, a paper sticker or the like, or may be formed by forming a recess directly on the cover 130 or writing it with ink.
  • the cover 130 has an opening in a part surrounded by the outer wall, and an inner lid 135 inside.
  • the inner lid 135 divides the inside of the cover 130 into two regions, that is, an opening side and a back side opposite to the opening side.
  • the sensor unit 110 is accommodated in a region on the back side inside the cover 130, and the fastening member 122 can be covered and fixed in a region on the opening side inside the cover 130.
  • the substrate 117 is fixed to the inner side of the cover 130 with an adhesive or the like so that the sensor unit 111, the determination unit 112, the communication circuit unit 113, the antenna unit 114, and the battery 115 face the inner lid 135. Yes.
  • the sensor unit 110 is buried in the cover 130 with a resin 136.
  • the resin 136 is a soft resin such as a silicone resin.
  • the portion filled with the resin 136 is further covered with an inner lid 135. As a result, the sensor unit 110 is sealed between the cover 130 and the inner lid 135.
  • the determination unit 112, the communication circuit unit 113, the antenna unit 114, and the battery 115 are arranged on the substrate 117, but the sensor unit 111. Are not arranged on the substrate 117.
  • the sensor unit 111 is connected to a terminal 118 provided on the substrate 117 by a wiring 119.
  • the sensor unit 111 is connected to the determination unit 112 via the wiring 119 and the terminal 118. According to this configuration, the sensor unit 111 does not need to be provided on the substrate 117, and can be fixed at a desired height inside the cover 130.
  • the sensor unit 111 may be fixed to the cover 130 with an adhesive or the like, or may be embedded inside the cover 130.
  • the area on the inner opening side of the cover 130 and the position where the nut 122b is arranged and the cover so that the shape of the opening matches the shape of the nut 122b.
  • a resin portion 137 filled with a soft resin is provided between 130.
  • the nut 122b may be fixed to the opening side of the cover 130 by the resin portion 137 or may not be fixed.
  • the resin portion 137 may be formed so that the size of the opening of the cover 130 is slightly smaller than the shape of the nut 122b.
  • the cover 130 when the nut 122b disposed in the opening of the cover 130 rotates with respect to the bolt 122a, the cover 130 also rotates with the rotation of the nut 122b. Accordingly, the sensor unit 111 fixed to the cover 130 also rotates with the rotation of the nut 122b.
  • the magnetic product 120 is composed of a permanent magnet 121. Since the permanent magnet 121 is the same as the permanent magnet 21 shown in the first embodiment, a detailed description thereof is omitted.
  • the permanent magnet 121 is bonded to the structure with an adhesive or the like.
  • the shape and size of the permanent magnet 121 may be appropriately changed depending on the size of the structure to which the permanent magnet 121 is attached, the attachment position in the structure, and the size of the region. For example, when the position where the permanent magnet 121 is attached is narrow, the size of the permanent magnet 121 may be reduced.
  • the height at which the permanent magnet is attached may be set to be substantially the same as the height of the sensor unit 111 when the nut 122b is fastened to the bolt 122a.
  • the sensor unit 111 and the permanent magnet 121 may have a height that can detect a state in which the nut 122b rotates once with respect to the bolt 122a, as in the sensor system shown in the second embodiment.
  • the sum of the thickness of the sensor unit 111 and the thickness of the permanent magnet 121 may be smaller than the lead length of the thread of the bolt 122a and the nut 122b.
  • the method for detecting an abnormality in the fastening state of the fastening member 122 by the sensor system 100 according to the present embodiment and the procedure for installing the sensor system 100 are the same as those in the sensor system 1 described in the first embodiment. Therefore, detailed description is omitted.
  • the permanent magnet 121 constituting the magnetic product 120 is arranged separately from the fastening member 122, and the sensor unit 110 is configured integrally with the fastening member 122. Even when there is a lot of free space on the 122 side and small space on the permanent magnet 121 side, the position of the magnetic product 120 can be detected by the sensor unit 110.
  • the fastening member is a bolt and a nut on which a thread is formed, but the fastening member may be a caulking on which no thread is formed.
  • bolt and only a nut may be sufficient.
  • the sensor unit is a magnetic sensor using a Hall element.
  • the magnetic sensor is not limited to a configuration using a Hall element, and may be any magnetic sensor having directivity.
  • other configurations such as a configuration using a coil may be used.
  • the magnetic product is a permanent magnet.
  • the magnetic product 20 is not limited to a permanent magnet, and may be another magnetic product such as an electromagnet.
  • the fastening member itself may be formed of a magnetic product such as a permanent magnet.
  • the position where the permanent magnet is fixed is not limited to the position facing the sensor portion and closest to the sensor portion in the nut, but may be a position not facing the nut.
  • the intermediate value between the magnetic reading value obtained by the first sensor unit and the magnetic reading value obtained by the second sensor unit is set as the abnormality detection threshold value.
  • the abnormality detection threshold value may be a predetermined value between the magnetic reading value by the first sensor unit and the magnetic reading value by the second sensor unit.
  • the determination unit determines that the position of the permanent magnet is not changed and the nut is loosened when the magnetic reading value of the permanent magnet read by the sensor unit is equal to or greater than the set abnormality detection threshold value. If the magnetic reading value of the permanent magnet read by the sensor unit is smaller than the set abnormality detection threshold, it is determined that the position of the permanent magnet has changed and the nut is loose.
  • the position of the permanent magnet is not changed according to the attachment position of the permanent magnet, for example, when the magnetic reading value of the permanent magnet read by the sensor portion is equal to or less than the set abnormality detection threshold, and the nut is not When it is determined that the magnet is not loose and the magnetic reading value of the permanent magnet read by the sensor unit is larger than the set abnormality detection threshold, the position of the permanent magnet has changed, and the nut It may be determined that the slack.
  • the sum of the thickness of the sensor portion and the thickness of the permanent magnet is smaller than the lead length of the screw thread of the bolt and nut.
  • the thickness may be such that an abnormality in the fastening state of the fastening member can be detected.
  • a magnetic product may be fixed to the fastening member, or the sensor unit may be fixed.
  • a cover may be attached to the fastening member, and a sensor unit may be accommodated in the cover.
  • the sensor system and sensor unit detects looseness of anchor bolts, bolts, nuts, etc. for fastening a structure that continues to receive vibrations caused by wind and traffic, such as bridges, signs, signboards, etc., to other structures. It is useful as a sensor system or sensor unit.

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Abstract

A sensor system (1) detects an abnormality of the fastening state of a fastening member (22). The sensor system (1) is provided with: a magnetism generating substance (20) that generates magnetism; and a sensor unit (10), which detects magnetism corresponding to the distance to the magnetism generating substance (20), and detects the abnormality of the fastening state of the fastening member (22) on the basis of the magnitude of the magnetism thus detected, and a predetermined threshold value. One out of the magnetism generating substance (20) and the sensor unit (10) is fixed to the fastening member (22), and moves such that the distance to the other one of the magnetism generating substance (20) and the sensor unit (10) changes on the basis of operations of the fastening member (22).

Description

センサシステムおよびセンサユニットSensor system and sensor unit
　本発明は、センサシステムおよびセンサユニットに関する。 The present invention relates to a sensor system and a sensor unit.
　従来、橋梁、標識または看板等の構造物は、アンカーボルト、ボルトおよびナット（以下ボルト等という。）により他の構造物へ締結されている。これらのボルト等は、風や交通に伴う振動を受け続けることにより弛んだり折損したりすることがある。この場合、ボルト等の締結力が失われ、構造物が他の構造物から外れてしまう等の危険が生じるおそれがある。また、複数のボルト等を用いて構造物を締結している場合であっても、１本のボルト等に弛みが生じると、他のボルト等にも連鎖的に弛みが生じ異常が拡がるため、放置すれば大事故に繋がりかねない。 Conventionally, structures such as bridges, signs or signboards are fastened to other structures by anchor bolts, bolts and nuts (hereinafter referred to as bolts). These bolts and the like may be loosened or broken by continuing to receive vibrations associated with wind and traffic. In this case, the fastening force of the bolts or the like is lost, and there is a risk that the structure may be detached from other structures. Moreover, even when a structure is fastened using a plurality of bolts, etc., if one bolt or the like is loosened, the other bolts are also loosened in a chained manner, and the abnormality spreads. If left unattended, it can lead to a major accident.
　そこで、ボルト等の弛みを検出する技術が開発されている（例えば、特許文献１、２参照）。特許文献１に記載の技術では、締め付け済のボルト等にキャップによる目印をするとともに、向きを示す指針を取り付けることで、ボルト等が弛んだ際の目視確認を容易にしている。また、特許文献２では、ボルト等に開けた穴へセンサ用ワイヤを通し、ボルト等が抜けたときにワイヤが切れることで、ボルト等の締結状態の異常を検出し、通報するシステムが開示されている。 Therefore, techniques for detecting loosening of bolts and the like have been developed (see, for example, Patent Documents 1 and 2). In the technique described in Patent Document 1, the bolts and the like that have been tightened are marked with a cap, and a pointer indicating the direction is attached to facilitate visual confirmation when the bolts and the like are loosened. Patent Document 2 discloses a system for detecting and reporting an abnormality in a fastening state of a bolt or the like by passing a sensor wire through a hole formed in the bolt or the like, and the wire is cut when the bolt or the like is pulled out. ing.
特開平１１－１５９５１３号公報Japanese Patent Laid-Open No. 11-159513 特開２０００－２００３９３号公報Japanese Patent Laid-Open No. 2000-200393
　しかし、特許文献１に記載の技術では、外部から点検者が全てのボルト等の弛みを容易に視認できるとは限らず、また、点検者が頻繁に点検を行う必要があり、現実的に点検が困難である。したがって、ボルト等に弛みが生じたときに自動的に異常を検出し通報する技術の開発が望まれている。 However, the technique described in Patent Document 1 does not always allow an inspector to easily visually check the looseness of all bolts from the outside, and the inspector needs to perform frequent inspections. Is difficult. Therefore, it is desired to develop a technique for automatically detecting and reporting an abnormality when a bolt or the like is loosened.
　また、特許文献２に記載の技術では、ボルト等が工具を使って外された場合または完全に脱落した場合にはボルト等の異常を検出することができるが、ボルト等に弛みが生じた程度では異常を検出することができないことがある。したがって、ボルト等が弛んで締結力を失った状態であっても通報されないというおそれがある。 Further, in the technique described in Patent Document 2, an abnormality such as a bolt can be detected when the bolt or the like is removed using a tool, or when the bolt is completely dropped. In some cases, abnormalities cannot be detected. Therefore, even if the bolts are loosened and the fastening force is lost, there is a risk of not being notified.
　上記課題に鑑み、本発明は、簡便な方法で締結部材の締結状態の異常を精度よく検出することができるセンサユニットおよびセンサシステムを提供することを目的とする。 In view of the above problems, an object of the present invention is to provide a sensor unit and a sensor system that can accurately detect an abnormality in a fastening state of a fastening member by a simple method.
　上記目的を達成するために、本発明にかかるセンサシステムの一態様は、締結部材の締結状態の異常を検出するセンサシステムであって、前記センサシステムは、磁気を発生する磁気発生物と、前記磁気発生物までの距離に対応する前記磁気を検出し、検出した前記磁気の大きさと予め定められた閾値とから、前記締結部材の締結状態の異常を検出するセンサユニットとを備え、前記磁気発生物および前記センサユニットのうちの一方は、前記締結部材に固着され、前記締結部材の動作に基づいて前記磁気発生物および前記センサユニットのうちの他方との間の距離が変化するように移動する。 In order to achieve the above object, one aspect of a sensor system according to the present invention is a sensor system for detecting an abnormality in a fastening state of a fastening member, wherein the sensor system includes a magnetic product that generates magnetism, A sensor unit for detecting the magnetism corresponding to the distance to the magnetic generation object and detecting an abnormality in the fastening state of the fastening member from the detected magnitude of the magnetism and a predetermined threshold value; One of the object and the sensor unit is fixed to the fastening member, and moves so that the distance between the magnetic product and the other of the sensor unit changes based on the operation of the fastening member. .
　この態様によれば、締結部材が締結状態から弛んだ締結状態の異常が発生すると、締結部材に固着された磁気発生物またはセンサユニットも締結部材の動作に基づいて移動する。したがって、磁気発生物とセンサユニットとの距離に対応して、センサユニットで検出される磁気の大きさが変化する。この磁気を検出することにより、締結部材の弛みを検出することができる。また、センサユニットにより検出した磁気の大きさと予め定められた閾値とを比較することにより締結部材の締結状態の異常の有無を判定するので、簡便な方法で締結部材の締結状態の異常を精度よく検出することができる。 According to this aspect, when an abnormality in the fastening state in which the fastening member is loosened from the fastening state occurs, the magnetic product or the sensor unit fixed to the fastening member also moves based on the operation of the fastening member. Accordingly, the magnitude of magnetism detected by the sensor unit changes in accordance with the distance between the magnetic generation product and the sensor unit. By detecting this magnetism, the looseness of the fastening member can be detected. In addition, since the presence or absence of an abnormality in the fastening state of the fastening member is determined by comparing the magnitude of magnetism detected by the sensor unit with a predetermined threshold, the abnormality in the fastening state of the fastening member can be accurately detected by a simple method. Can be detected.
　また、前記磁気発生物は、永久磁石であってもよい。 In addition, the magnetic product may be a permanent magnet.
　この構成によれば、磁気を利用することにより、磁気発生物が所定範囲に存在するか否か、すなわち、磁気発生物が固着された締結部材が弛んでいるという締結状態の異常が生じていないかどうかを非接触で検出することができる。 According to this configuration, by using magnetism, whether or not the magnetic product is in a predetermined range, that is, the fastening state abnormality that the fastening member to which the magnetic product is fixed is loose has not occurred. Whether or not can be detected without contact.
　また、上記目的を達成するために、本発明にかかるセンサユニットの一態様は、上述した特徴を有するセンサシステムに用いられるセンサユニットであって、前記センサユニットは、前記磁気を検出するセンサ部と、前記センサ部により検出した前記磁気の大きさを前記閾値と比較することにより前記締結部材の締結状態の異常の有無を判定する判定部とを備える。 In order to achieve the above object, one aspect of a sensor unit according to the present invention is a sensor unit used in a sensor system having the above-described features, wherein the sensor unit includes a sensor unit that detects the magnetism. And a determination unit that determines whether or not there is an abnormality in the fastening state of the fastening member by comparing the magnitude of the magnetism detected by the sensor unit with the threshold value.
　この構成によれば、センサ部により検出された磁気の大きさと閾値とを比較することにより、締結部材の締結状態の異常の有無を容易に判定することができる。 According to this configuration, the presence / absence of abnormality in the fastening state of the fastening member can be easily determined by comparing the magnitude of the magnetism detected by the sensor unit with the threshold value.
　また、前記判定部は、前記センサ部により検出した前記磁気の大きさが前記閾値より小さい場合に、前記締結部材の締結状態を異常有りと判定してもよい。 Further, the determination unit may determine that the fastening state of the fastening member is abnormal when the magnitude of the magnetism detected by the sensor unit is smaller than the threshold value.
　この構成によれば、永久磁石が、締結部材において、センサ部と対向しセンサ部に最も近接する位置から外れた（または、離れた）場合に、締結部材の締結状態の異常を容易に検出することができる。 According to this configuration, when the permanent magnet deviates (or leaves) from the position facing the sensor unit and closest to the sensor unit in the fastening member, an abnormality in the fastening state of the fastening member is easily detected. be able to.
　また、前記締結部材は、ねじ山が形成されたボルトまたはナットであり、前記センサ部の厚さは、前記磁気発生物の厚さとの和が前記ねじ山のリード長より小さくなるように形成されていてもよい。 Further, the fastening member is a bolt or nut in which a thread is formed, and the thickness of the sensor portion is formed such that the sum of the thickness of the magnetic product and the lead length of the thread is smaller. It may be.
　この構成によれば、ナットが１回転弛み、永久磁石が再びセンサ部と対向する位置に配置された場合には、永久磁石は高さ方向においてセンサ部と対向する位置に配置されないため、センサ部では永久磁石から発生する磁気を検出することができない。したがって、ナットがボルトに対して１回転弛んでいるという締結状態の異常を検出することができる。 According to this configuration, when the nut is loosened once and the permanent magnet is disposed again at the position facing the sensor unit, the permanent magnet is not disposed at the position facing the sensor unit in the height direction. Thus, the magnetism generated from the permanent magnet cannot be detected. Therefore, it is possible to detect an abnormality in the fastening state in which the nut is loosened once with respect to the bolt.
　また、前記センサ部は、前記センサ部の下端が、基準面から前記磁気発生物の厚さ分の高さよりも高い位置になるように設置されていてもよい。 The sensor unit may be installed such that a lower end of the sensor unit is positioned higher than a height corresponding to a thickness of the magnetic product from a reference plane.
　この構成によれば、締結部材に固着された永久磁石またはセンサユニットが締結部材から脱落した場合に、センサ部と永久磁石とは対向しなくなるため、センサ部では永久磁石から発生する磁気を検出することができないので、これにより、締結部材に固着された永久磁石またはセンサユニットが締結部材から脱落したという異常を検出することができる。 According to this configuration, when the permanent magnet or the sensor unit fixed to the fastening member is detached from the fastening member, the sensor unit and the permanent magnet do not face each other, so the sensor unit detects magnetism generated from the permanent magnet. Therefore, it is possible to detect an abnormality that the permanent magnet or the sensor unit fixed to the fastening member has fallen off from the fastening member.
　また、前記判定部により判定した前記締結部材の締結状態の異常の有無を送信する送信部をさらに備えてもよい。 Further, a transmission unit that transmits the presence / absence of abnormality in the fastening state of the fastening member determined by the determination unit may be further provided.
　この構成によれば、締結部材の締結状態の異常が生じたときに、ユーザに締結状態の異常を報知することができる。 According to this configuration, when an abnormality in the fastening state of the fastening member occurs, it is possible to notify the user of the abnormality in the fastening state.
　本発明によれば、簡便な方法で締結部材の締結状態の異常を精度よく検出することができるセンサユニットおよびセンサシステムを提供することができる。 According to the present invention, it is possible to provide a sensor unit and a sensor system that can accurately detect an abnormality in a fastening state of a fastening member by a simple method.
図１は、実施の形態１にかかるセンサシステムの構成を示すブロック図である。FIG. 1 is a block diagram of the configuration of the sensor system according to the first embodiment. 図２は、実施の形態１にかかるセンサシステムの構成を示す概略図であり、（ａ）は平面図、（ｂ）は正面図である。FIG. 2 is a schematic diagram illustrating the configuration of the sensor system according to the first embodiment, where (a) is a plan view and (b) is a front view. 図３Ａは、実施の形態１にかかるセンサシステムにより検出する締結状態の異常の一例を示す平面図である。FIG. 3A is a plan view illustrating an example of an abnormality in a fastening state detected by the sensor system according to the first embodiment. 図３Ｂは、実施の形態１にかかるセンサシステムにより検出する締結状態の異常の他の例を示す平面図である。FIG. 3B is a plan view illustrating another example of the abnormality in the fastening state detected by the sensor system according to the first embodiment. 図４は、実施の形態１にかかるセンサシステムにより締結状態の異常の検出手順を示すフローチャートである。FIG. 4 is a flowchart of a procedure for detecting an abnormality in the fastening state by the sensor system according to the first embodiment. 図５は、実施の形態２にかかるセンサシステムの構成を示す概略図であり、（ａ）は平面図、（ｂ）は正面図である。FIG. 5 is a schematic diagram illustrating a configuration of a sensor system according to the second embodiment, where (a) is a plan view and (b) is a front view. 図６Ａは、実施の形態２にかかるセンサシステムにより検出する締結状態の異常の一例を示す正面図である。FIG. 6A is a front view illustrating an example of an abnormality in a fastening state detected by the sensor system according to the second embodiment. 図６Ｂは、実施の形態２にかかるセンサシステムにより検出する締結状態の異常の他の例を示す正面図である。FIG. 6B is a front view illustrating another example of the abnormality in the fastening state detected by the sensor system according to the second embodiment. 図７は、実施の形態３にかかるセンサシステムの構成を示すブロック図である。FIG. 7 is a block diagram of the configuration of the sensor system according to the third embodiment. 図８は、実施の形態３にかかるセンサシステムの構成を示す概略図であり、（ａ）は平面図、（ｂ）はキャップを通してセンサユニットを透視した正面図である。FIG. 8 is a schematic diagram illustrating the configuration of the sensor system according to the third embodiment, where (a) is a plan view and (b) is a front view seen through the sensor unit through a cap. 図９は、実施の形態３にかかるセンサシステムの構成の詳細を示す概略図であり、（ａ）はセンサユニットの正面図、（ｂ）は内蓋側からみたときのセンサユニットの平面図、（ｃ）は内蓋側から見たときの締結部材の平面図である。FIG. 9 is a schematic diagram illustrating details of the configuration of the sensor system according to the third embodiment, where (a) is a front view of the sensor unit, and (b) is a plan view of the sensor unit as viewed from the inner lid side. (C) is a top view of the fastening member when viewed from the inner lid side.
　以下、実施の形態について説明する。なお、以下に説明する実施の形態は、いずれも好ましい一具体例を示すものである。したがって、以下の実施の形態で示される、数値、形状、材料、構成要素、構成要素の配置位置及び接続形態、並びに、工程及び工程の順序などは、一例であって本発明を限定する主旨ではない。よって、以下の実施の形態における構成要素のうち、本発明の最上位概念を示す独立請求項に記載されていない構成要素については、任意の構成要素として説明される。 Hereinafter, embodiments will be described. Note that each of the embodiments described below shows a preferred specific example. Therefore, numerical values, shapes, materials, components, arrangement positions and connection forms of components, and steps and order of steps shown in the following embodiments are merely examples and are not intended to limit the present invention. Absent. Therefore, among the constituent elements in the following embodiments, constituent elements that are not described in the independent claims showing the highest concept of the present invention are described as optional constituent elements.
　また、各図は、模式図であり、必ずしも厳密に図示されたものではない。なお、各図において、実質的に同一の構成に対しては同一の符号を付しており、重複する説明は省略または簡略化する。 Each figure is a schematic diagram and is not necessarily shown strictly. In each figure, substantially the same configuration is denoted by the same reference numeral, and redundant description is omitted or simplified.
　（実施の形態１）
　［１．センサシステムの構成］
　以下、実施の形態１にかかるセンサシステム１について、図１～図４を用いて説明する。図１は、本実施の形態にかかるセンサシステム１の構成を示すブロック図である。図２は、センサシステム１の構成を示す概略図であり、（ａ）は平面図、（ｂ）は正面図である。 (Embodiment 1)
[1. Configuration of sensor system]
Hereinafter, the sensor system 1 according to the first embodiment will be described with reference to FIGS. FIG. 1 is a block diagram showing a configuration of a sensor system 1 according to the present embodiment. 2A and 2B are schematic views showing the configuration of the sensor system 1, wherein FIG. 2A is a plan view and FIG. 2B is a front view.
　図１および図２に示すように、センサシステム１は、センサユニット１０と磁気発生物２０とで構成されている。磁気発生物２０およびセンサユニット１０のうちの一方は締結部材２２に固着され、締結部材２２の動作に基づいて磁気発生物２０およびセンサユニット１０のうちの他方との間の距離が変化するように移動する。図１および図２では、磁気発生物２０が締結部材２２に固着された例を示している。 As shown in FIGS. 1 and 2, the sensor system 1 includes a sensor unit 10 and a magnetic product 20. One of the magnetic product 20 and the sensor unit 10 is fixed to the fastening member 22 so that the distance between the magnetic product 20 and the other of the sensor unit 10 changes based on the operation of the fastening member 22. Moving. 1 and 2 show an example in which the magnetic product 20 is fixed to the fastening member 22.
　センサユニット１０は、センサ部１１と、判定部１２と、通信回路部１３と、アンテナ部１４と、電池１５とを備えている。センサ部１１、判定部１２、通信回路部１３、アンテナ部１４および電池１５は、基板１７の上に配置され、防水のケース１８で覆われている。基板１７には、センサ部１１、判定部１２、通信回路部１３、アンテナ部１４および電池１５を接続する配線（図示せず）が形成されている。センサユニット１０は、磁気発生物２０までの距離に対応する磁気を検出し、検出した磁気の大きさと、後に詳述する異常検出閾値とから、締結部材２２の締結状態の異常を検出する。 The sensor unit 10 includes a sensor unit 11, a determination unit 12, a communication circuit unit 13, an antenna unit 14, and a battery 15. The sensor unit 11, the determination unit 12, the communication circuit unit 13, the antenna unit 14, and the battery 15 are disposed on the substrate 17 and covered with a waterproof case 18. A wiring (not shown) for connecting the sensor unit 11, the determination unit 12, the communication circuit unit 13, the antenna unit 14, and the battery 15 is formed on the substrate 17. The sensor unit 10 detects magnetism corresponding to the distance to the magnetic product 20 and detects an abnormality in the fastening state of the fastening member 22 from the detected magnitude of the magnetism and an abnormality detection threshold described in detail later.
　センサ部１１は、例えば、ホール素子を用いた磁気センサであり、後述する磁気発生物２０から発生する磁気を検出する。なお、磁気センサは、ホール素子を用いた構成に限らず、指向性を備えた磁気センサであればよく、例えばコイルを用いた構成など他の構成であってもよい。 The sensor unit 11 is, for example, a magnetic sensor using a Hall element, and detects magnetism generated from a magnetic generator 20 described later. The magnetic sensor is not limited to a configuration using a Hall element, but may be any magnetic sensor having directivity, and may be another configuration such as a configuration using a coil.
　判定部１２は、例えば、コンピュータ、マイコン等により構成される。判定部１２は、センサ部１１により検出した磁気の大きさを、後に詳述する異常検出閾値と比較することにより、締結部材２２の締結状態の異常の有無を判定する。ここでいう締結状態の異常とは、例えば、ナット２２ｂがボルト２２ａに対して弛んだり、ボルト２２ａが折損した状態をいう。 The determination unit 12 is configured by, for example, a computer or a microcomputer. The determination unit 12 determines the presence / absence of abnormality in the fastening state of the fastening member 22 by comparing the magnitude of magnetism detected by the sensor unit 11 with an abnormality detection threshold described in detail later. The abnormality in the fastening state referred to here means, for example, a state where the nut 22b is loose with respect to the bolt 22a or the bolt 22a is broken.
　通信回路部１３は、判定部１２において締結部材２２が締結状態の異常を生じていると判定された場合に、当該締結状態の異常をユーザに報知するための送信信号をアンテナ部１４に送信する。 When the determination unit 12 determines that the fastening member 22 has an abnormality in the fastening state, the communication circuit unit 13 transmits a transmission signal for notifying the user of the abnormality in the fastening state to the antenna unit 14. .
　アンテナ部１４は、通信回路部１３から送信された締結状態の異常の有無を報知するための送信信号を、ユーザに異常を知らせるためのコンピュータ（図示せず）に送信する。これにより、ユーザは、締結部材２２の締結状態の異常を知ることができる。 The antenna unit 14 transmits a transmission signal transmitted from the communication circuit unit 13 for notifying whether there is an abnormality in the fastening state to a computer (not shown) for notifying the user of the abnormality. Thereby, the user can know the abnormality of the fastening state of the fastening member 22.
　なお、通信回路部１３およびアンテナ部１４は、本発明における通信部に相当する。 The communication circuit unit 13 and the antenna unit 14 correspond to the communication unit in the present invention.
　電池１５は、センサユニット１０を動作させるための電圧源である。例えば、電池１５により、通信回路部１３に配置された通信デバイス等（図示せず）に駆動電圧が印加される。 The battery 15 is a voltage source for operating the sensor unit 10. For example, the drive voltage is applied to the communication device or the like (not shown) arranged in the communication circuit unit 13 by the battery 15.
　また、磁気発生物２０は、例えば永久磁石２１である。永久磁石２１は、例えば、フェライトにより形成されている。永久磁石２１は、図２の（ａ）および（ｂ）に示すように、異常を検出したい締結部材２２の側面に磁力により固着している。これにより、永久磁石２１は、締結部材２２の動作に基づいて、センサユニット１０との間の距離が変化するように移動する。なお、図２の（ａ）および（ｂ）では、締結部材２２としてボルト２２ａおよびナット２２ｂの例を示している。永久磁石２１は、例えば、ナット２２ｂに磁力により固着しており、ナット２２ｂが回転すると永久磁石２１もナット２２ｂとともに回転する。なお、磁気発生物２０は、永久磁石に限らず、例えば電磁石など他の磁気発生物であってもよい。 Further, the magnetic product 20 is, for example, a permanent magnet 21. The permanent magnet 21 is made of ferrite, for example. As shown in FIGS. 2A and 2B, the permanent magnet 21 is fixed to the side surface of the fastening member 22 where an abnormality is to be detected by a magnetic force. Thereby, the permanent magnet 21 moves so that the distance between the permanent magnet 21 and the sensor unit 10 changes based on the operation of the fastening member 22. 2A and 2B show examples of the bolt 22a and the nut 22b as the fastening member 22. FIG. For example, the permanent magnet 21 is fixed to the nut 22b by magnetic force, and when the nut 22b rotates, the permanent magnet 21 also rotates together with the nut 22b. The magnetic product 20 is not limited to a permanent magnet, and may be another magnetic product such as an electromagnet.
　締結部材２２は、永久磁石２１により磁気を帯びる金属により形成されている。例えば、締結部材２２は、鉄により形成されている。締結部材２２は、上述したように、例えばボルト２２ａおよびナット２２ｂであり、ボルト２２ａおよびナット２２ｂにはねじ山が形成されていてもよい。また、ねじ山が形成されていないカシメであってもよい。 The fastening member 22 is formed of a metal that is magnetized by the permanent magnet 21. For example, the fastening member 22 is made of iron. As described above, the fastening member 22 is, for example, a bolt 22a and a nut 22b, and a screw thread may be formed on the bolt 22a and the nut 22b. Further, it may be a caulking in which no thread is formed.
　なお、締結部材２２は、少なくとも永久磁石２１が固着する部材が磁気を帯びる金属により形成されていればよく、例えば、図２の（ａ）および（ｂ）では、少なくともナット２２ｂが磁気を帯びる金属により形成されていればよい。また、締結部材２２自体が永久磁石で形成されていてもよい。この場合、締結部材２２が磁気発生物２０となるため、別途ナット２２ｂに永久磁石を設ける必要はない。 The fastening member 22 is only required to be formed of a metal whose magnet is fixed to at least the permanent magnet 21. For example, in FIGS. 2A and 2B, at least the nut 22b is magnetized. It is sufficient if it is formed by. Moreover, fastening member 22 itself may be formed with the permanent magnet. In this case, since the fastening member 22 becomes the magnetic product 20, it is not necessary to separately provide a permanent magnet on the nut 22b.
　磁気発生物２０として永久磁石２１を、センサ部１１として磁気センサを用いることにより、磁気発生物２０が所定範囲に存在するか否か、すなわち、磁気発生物２０が固着された締結部材２２が弛んでいるという締結状態の異常が生じていないかどうかを非接触で検出することができる。 By using a permanent magnet 21 as the magnetic product 20 and a magnetic sensor as the sensor unit 11, whether or not the magnetic product 20 exists in a predetermined range, that is, the fastening member 22 to which the magnetic product 20 is fixed is loosened. It is possible to detect in a non-contact manner whether or not there is an abnormality in the fastening state that the belt is stuck.
　［２．締結状態の異常の検出手順］
　次に、センサシステム１による磁気発生物２０の締結状態の異常の検出手順について説明する。図３Ａおよび図３Ｂは、センサシステム１により検出する締結状態の異常の例を示す平面図である。 [2. Detection procedure of fastening abnormality]
Next, a procedure for detecting abnormality in the fastening state of the magnetic product 20 by the sensor system 1 will be described. FIG. 3A and FIG. 3B are plan views showing examples of abnormality in the fastening state detected by the sensor system 1.
　図３Ａに示すように、ナット２２ｂがボルト２２ａに対して弛んだ場合、ナット２２ｂとともに永久磁石２１の位置は回転するので、センサ部１１と永久磁石２１との距離は遠くなる。センサ部１１と永久磁石２１との距離が遠くなると、センサ部１１で検出される永久磁石２１による磁気は小さくなる。センサシステム１は、この状態を、締結部材２２の締結状態が異常であると検出する。 As shown in FIG. 3A, when the nut 22b is slack with respect to the bolt 22a, the position of the permanent magnet 21 rotates together with the nut 22b, so the distance between the sensor unit 11 and the permanent magnet 21 increases. When the distance between the sensor unit 11 and the permanent magnet 21 increases, the magnetism by the permanent magnet 21 detected by the sensor unit 11 decreases. The sensor system 1 detects this state that the fastening state of the fastening member 22 is abnormal.
　また、ボルト２２ａが折損した場合、図３Ｂに示すように、ボルト２２ａの折損部分と、永久磁石２１を固着させていたナット２２ｂとは、完全にセンサ部１１が磁気を検出することができる範囲に存在しなくなる。センサシステム１は、この状態を異常として検出する。 In addition, when the bolt 22a is broken, as shown in FIG. 3B, the broken portion of the bolt 22a and the nut 22b to which the permanent magnet 21 is fixed are within a range in which the sensor unit 11 can completely detect magnetism. No longer exists. The sensor system 1 detects this state as an abnormality.
　詳細には、以下のとおりである。 Details are as follows.
　図４は、センサシステム１により磁気発生物２０を検出する手順を示すフローチャートである。 FIG. 4 is a flowchart showing a procedure for detecting the magnetic product 20 by the sensor system 1.
　はじめに、センサユニット１０を設置する。センサユニット１０は、基板１７を、例えば接着剤等で構造物に接着することにより設置する。このとき、ナット２２ｂに取り付けられる永久磁石２１とセンサ部１１とが所定の間隔をおいて対向する位置に、センサユニット１０を設置する（ステップＳ１１）。 First, the sensor unit 10 is installed. The sensor unit 10 is installed by bonding the substrate 17 to a structure with, for example, an adhesive. At this time, the sensor unit 10 is installed at a position where the permanent magnet 21 attached to the nut 22b and the sensor unit 11 face each other with a predetermined interval (step S11).
　続けて、１回目のセンサ部１１による磁気の読み取りを行う（ステップＳ１２）。センサユニット１０を設置した状態のまま、センサ部１１により、その場に存在する磁気の大きさを読み取る。 Subsequently, magnetic reading is performed by the first sensor unit 11 (step S12). While the sensor unit 10 is installed, the sensor unit 11 reads the magnitude of magnetism present on the spot.
　次に、永久磁石２１を設置する（ステップＳ１３）。永久磁石２１は、ナット２２ｂにおいて、センサ部１１と対向しセンサ部１１に最も近接する位置に、磁力により固着する。この状態で、２回目のセンサ部１１による磁気の読み取りを行う（ステップＳ１４）。　　　 Next, the permanent magnet 21 is installed (step S13). The permanent magnet 21 is fixed by a magnetic force at a position facing the sensor unit 11 and closest to the sensor unit 11 in the nut 22b. In this state, magnetic reading is performed by the sensor unit 11 for the second time (step S14). *
　なお、永久磁石２１は、接着剤によりナット２２ｂに接着したり、ナット２２ｂに形成された凹部（図示せず）に埋め込む等の方法で固着してもよい。また、永久磁石２１を固着する位置は、ナット２２ｂにおいて、センサ部１１と対向しセンサ部１１に最も近接する位置に限らず、ナット２２ｂと対向しない位置であってもよい。 The permanent magnet 21 may be fixed by a method such as bonding to the nut 22b with an adhesive or embedding in a recess (not shown) formed in the nut 22b. Further, the position where the permanent magnet 21 is fixed is not limited to the position facing the sensor unit 11 and closest to the sensor unit 11 in the nut 22b, but may be a position not facing the nut 22b.
　次に、１回目および２回目のセンサ部１１による磁気の読み取りにおいて読み取った読み取り値の間の所定値を、異常検出閾値として設定する（ステップＳ１５）。例えば、１回目のセンサ部１１による磁気の読み取り値と２回目のセンサ部１１による磁気の読み取り値の中間値を、異常検出閾値として設定する。なお、異常検出閾値は、本発明における予め定められた閾値に相当する。異常検出閾値を、２回目のセンサ部１１による磁気の読み取り値に近い値とすることにより、締結状態の異常を検出する感度を上げることができる。 Next, a predetermined value between the reading values read in the magnetic reading by the first and second sensor portions 11 is set as an abnormality detection threshold (step S15). For example, an intermediate value between the magnetic reading value by the first sensor unit 11 and the magnetic reading value by the second sensor unit 11 is set as the abnormality detection threshold. Note that the abnormality detection threshold corresponds to a predetermined threshold in the present invention. By setting the abnormality detection threshold value to a value close to the magnetic reading value by the second sensor unit 11, it is possible to increase the sensitivity for detecting the abnormality in the fastening state.
　さらに、判定部１２により、センサ部１１により永久磁石２１から出力される磁気の大きさを読み取り、センサ部１１により読み取った永久磁石２１の磁気の読み取り値と、設定した異常検出閾値とを比較し、締結部材２２に締結状態の異常を生じているかどうか、締結状態の異常の判定を行う（ステップＳ１６）。判定部１２は、センサ部１１により読み取った永久磁石２１の磁気の読み取り値が設定した異常検出閾値以上の場合に、永久磁石２１の位置は変化しておらず、ナット２２ｂは弛んでいないと判定する。また、判定部１２は、センサ部１１により読み取った永久磁石２１の磁気の読み取り値が設定した異常検出閾値より小さい場合に、永久磁石２１の位置は変化しており、ナット２２ｂは弛んでいると判定する。 Further, the magnitude of magnetism output from the permanent magnet 21 by the sensor unit 11 is read by the determination unit 12, and the magnetism reading value of the permanent magnet 21 read by the sensor unit 11 is compared with the set abnormality detection threshold value. Then, whether or not the fastening member 22 has an abnormality in the fastening state is determined (step S16). The determination unit 12 determines that the position of the permanent magnet 21 is not changed and the nut 22b is not loose when the magnetic reading value of the permanent magnet 21 read by the sensor unit 11 is equal to or greater than the set abnormality detection threshold. To do. Further, when the magnetism reading value of the permanent magnet 21 read by the sensor unit 11 is smaller than the set abnormality detection threshold, the determination unit 12 changes the position of the permanent magnet 21 and the nut 22b is loose. judge.
　これにより、構造物やナット２２ｂが施工状況または永久磁石２１により着磁している場合であっても、着磁の影響を除外することができる。また、センサ部１１で検出することができる磁気の大きさのばらつきや、永久磁石２１およびセンサユニット１０の設置位置のばらつきによる、センサ部１１で検出することができる磁気の大きさへの影響を除外することができる。 Thereby, even if the structure or nut 22b is magnetized by the construction status or the permanent magnet 21, the influence of magnetization can be excluded. Moreover, the influence on the magnitude | size of the magnetism which can be detected by the sensor part 11 by the dispersion | variation in the magnitude | size of the magnetism which can be detected with the sensor part 11, and the dispersion | variation in the installation position of the permanent magnet 21 and the sensor unit 10 is shown. Can be excluded.
　なお、永久磁石２１を固着する位置は、ナット２２ｂにおいて、センサ部１１と対向しセンサ部１１に最も近接する位置に限らず、ナット２２ｂと対向しない位置であってもよい。この場合、判定部１２は、センサ部１１により読み取った永久磁石２１の磁気の読み取り値が設定した異常検出閾値以下の場合に、永久磁石２１の位置は変化しておらず、ナット２２ｂは弛んでいないと判定し、センサ部１１により読み取った永久磁石２１の磁気の読み取り値が設定した異常検出閾値より大きい場合に、永久磁石２１の位置は変化しており、ナット２２ｂは弛んでいると判定してもよい。 The position where the permanent magnet 21 is fixed is not limited to the position facing the sensor unit 11 and closest to the sensor unit 11 in the nut 22b, and may be a position not facing the nut 22b. In this case, when the magnetic reading value of the permanent magnet 21 read by the sensor unit 11 is equal to or less than the set abnormality detection threshold, the determination unit 12 does not change the position of the permanent magnet 21 and the nut 22b is loosened. When the magnetic reading value of the permanent magnet 21 read by the sensor unit 11 is larger than the set abnormality detection threshold, it is determined that the position of the permanent magnet 21 has changed and the nut 22b is loose. May be.
　また、ボルト２２ａが折損した場合については、ナット２２ｂが弛んだ場合と同様、判定部１２は、異常検出閾値を設定し、センサ部１１により読み取った永久磁石２１の磁気の読み取り値が設定した異常検出閾値よりも小さい場合には、ボルト２２ａが折損しておらず、センサ部１１により読み取った永久磁石２１の磁気の読み取り値が設定した異常検出閾値以上の場合には、ボルト２２ａが折損していると判定してもよい。また、異常検出閾値を設定するか否かに関わらず、センサ部１１により磁気が読み取れない場合に、ボルト２２ａが折損していると判定してもよい。 In the case where the bolt 22a is broken, as in the case where the nut 22b is loosened, the determination unit 12 sets an abnormality detection threshold, and an abnormality in which the magnetic reading value of the permanent magnet 21 read by the sensor unit 11 is set. If it is smaller than the detection threshold, the bolt 22a is not broken. If the magnetic reading value of the permanent magnet 21 read by the sensor unit 11 is equal to or greater than the set abnormality detection threshold, the bolt 22a is broken. It may be determined that Further, it may be determined that the bolt 22a is broken when the sensor unit 11 cannot read magnetism regardless of whether or not the abnormality detection threshold is set.
　さらに、センサユニット１０の設置後、センサユニット１０は、所定の時間間隔、例えば１時間毎にセンサ部１１によりナット２２ｂの締結状態の異常の有無を確認し、異常がある場合には異常を報知する送信信号を通信回路部１３およびアンテナ部１４により送信するという動作を行う。ここで、締結状態の異常が発生していない場合には、センサユニット１０からユーザへの通信は１日１回定期的に行われることとしてもよい。この場合、定期的な通信がなければ、図示しない受信機側でセンサユニット１０の動作が異常であると判定してもよい。 Further, after the sensor unit 10 is installed, the sensor unit 10 checks the presence or absence of an abnormality in the fastening state of the nut 22b by the sensor unit 11 at a predetermined time interval, for example, every hour. The transmission signal to be transmitted is transmitted by the communication circuit unit 13 and the antenna unit 14. Here, when the abnormality of the fastening state has not occurred, communication from the sensor unit 10 to the user may be periodically performed once a day. In this case, if there is no regular communication, it may be determined that the operation of the sensor unit 10 is abnormal on the receiver side (not shown).
　［３．効果等］
　以上、本実施の形態にかかるセンサシステム１およびセンサユニット１０によると、締結部材２２が締結状態から弛んだという締結状態の異常が発生すると、締結部材２２に固着された磁気発生物２０も締結部材２２の動作に基づいて移動する。したがって、磁気発生物２０とセンサユニット１０との距離に対応して、センサユニット１０で検出される磁気の大きさが変化する。この磁気を検出することにより、締結部材２２の弛みを検出することができる。また、センサユニット１０により検出した磁気の大きさと予め定められた異常検出閾値とを比較することにより締結部材２２の締結状態の異常の有無を判定するので、簡便な方法で締結部材２２の締結状態の異常を精度よく検出することができる。 [3. Effect]
As described above, according to the sensor system 1 and the sensor unit 10 according to the present embodiment, when the abnormality of the fastening state that the fastening member 22 has loosened from the fastening state occurs, the magnetic product 20 fixed to the fastening member 22 is also the fastening member. It moves based on 22 operations. Accordingly, the magnitude of magnetism detected by the sensor unit 10 changes in accordance with the distance between the magnetic product 20 and the sensor unit 10. By detecting this magnetism, looseness of the fastening member 22 can be detected. Moreover, since the presence or absence of abnormality of the fastening state of the fastening member 22 is determined by comparing the magnitude of magnetism detected by the sensor unit 10 with a predetermined abnormality detection threshold value, the fastening state of the fastening member 22 can be determined by a simple method. Can be accurately detected.
　（実施の形態２）
　次に、実施の形態２について、図５～図６Ｂを用いて説明する。図５は、本実施の形態にかかるセンサシステムの構成を示す概略図であり、（ａ）は平面図、（ｂ）は正面図である。図６Ａおよび図６Ｂは、センサシステムにより検出する締結状態の異常の例を示す平面図である。 (Embodiment 2)
Next, Embodiment 2 will be described with reference to FIGS. 5 to 6B. FIG. 5 is a schematic diagram illustrating a configuration of the sensor system according to the present embodiment, where (a) is a plan view and (b) is a front view. FIG. 6A and FIG. 6B are plan views showing examples of abnormality in the fastening state detected by the sensor system.
　本実施の形態にかかるセンサシステムが実施の形態１に示したセンサシステム１と異なる点は、締結部材が弛んでＮ回転し、永久磁石が再びセンサ部と対向する位置に配置された場合であっても、締結状態の異常を検出することができる点である。 The sensor system according to the present embodiment is different from the sensor system 1 shown in the first embodiment in that the fastening member is loosened and rotates N times, and the permanent magnet is disposed again at a position facing the sensor unit. However, it is a point which can detect the abnormality of a fastening state.
　図５（ａ）および（ｂ）に示すように、本実施の形態にかかるセンサシステムは、センサユニット３０と、磁気発生物４０とで構成されている。 As shown in FIGS. 5A and 5B, the sensor system according to the present embodiment includes a sensor unit 30 and a magnetic product 40.
　センサユニット３０は、センサ部３１と、判定部１２と、通信回路部１３と、アンテナ部１４と、電池１５とを備えている。判定部１２、通信回路部１３、アンテナ部１４および電池１５は、実施の形態１に示したセンサユニットと同様の構成であるため、詳細な説明を省略する。 The sensor unit 30 includes a sensor unit 31, a determination unit 12, a communication circuit unit 13, an antenna unit 14, and a battery 15. Since the determination unit 12, the communication circuit unit 13, the antenna unit 14, and the battery 15 have the same configuration as the sensor unit described in the first embodiment, detailed description thereof is omitted.
　センサ部３１は、図５の（ａ）に示すように、センサユニット３０を平面視したときに永久磁石４１と対向する位置に配置されている。また、同図の（ｂ）に示すように、センサ部３１は、実施の形態１に示したセンサ部１１よりも、基板１７からの高さ方向の厚さが薄い構成となっている。すなわち、センサ部３１は、実施の形態１に示したセンサ部１１よりも、磁気を検出することができる範囲が狭くなるように構成されている。センサ部３１は、同図の（ｂ）に示すように、支持部３２を介して、基板１７から所定の高さの位置に配置されている。 The sensor part 31 is arrange | positioned in the position facing the permanent magnet 41, when the sensor unit 30 is planarly viewed, as shown to (a) of FIG. Further, as shown in (b) of the figure, the sensor unit 31 has a configuration in which the thickness in the height direction from the substrate 17 is thinner than the sensor unit 11 shown in the first embodiment. That is, the sensor unit 31 is configured to have a narrower range in which magnetism can be detected than the sensor unit 11 shown in the first embodiment. The sensor unit 31 is arranged at a predetermined height from the substrate 17 via the support unit 32 as shown in FIG.
　また、磁気発生物４０は、例えば、永久磁石４１である。永久磁石４１は、後述するように、カバー４３を介して締結部材４２に接着により固着している。なお、図５の（ａ）および（ｂ）では、締結部材４２としてボルト４２ａおよびナット４２ｂの例を示している。また、センサ部３１の厚さは、永久磁石４１の厚さとの和が、ボルト４２ａおよびナット４２ｂのねじ山のリード長より小さくなるように形成されている。つまり、センサ部３１の厚さと永久磁石４１の厚さとの和が、ボルト４２ａおよびナット４２ｂのねじ山のリード長より小さい値となっている。これにより、ナット４２ｂがボルト４２ａの周囲を１周回転して永久磁石４１とセンサ部３１が対向する場合であっても、締結部材４２の締結状態の異常を検出することができる。 The magnetic product 40 is, for example, a permanent magnet 41. As will be described later, the permanent magnet 41 is fixed to the fastening member 42 via a cover 43 by adhesion. 5A and 5B show an example of the bolt 42a and the nut 42b as the fastening member 42. FIG. Further, the thickness of the sensor portion 31 is formed such that the sum of the thickness of the permanent magnet 41 is smaller than the lead length of the thread of the bolt 42a and the nut 42b. That is, the sum of the thickness of the sensor unit 31 and the thickness of the permanent magnet 41 is smaller than the lead length of the thread of the bolt 42a and the nut 42b. Thereby, even if the nut 42b rotates around the bolt 42a once and the permanent magnet 41 and the sensor unit 31 face each other, an abnormality in the fastening state of the fastening member 42 can be detected.
　また、図５の（ａ）および（ｂ）に示すように、締結部材４２は、カバー４３により全体が覆われている。カバー４３は、例えば、ＡＢＳ（Ａｃｒｙｌｏｎｉｔｒｉｌｅ　Ｂｕｔａｄｉｅｎｅ　Ｓｔｙｒｅｎｅ）樹脂などの軟質性の樹脂により構成され、一部に、ナット４２ｂと同一の形状であってナット４２ｂの大きさよりも若干小さい開口（図示せず）が形成されている。この開口にナット４２ｂが接触する。なお、ナット４２ｂは、カバー４３の開口部分に固着されてもよいし、固着されなくてもよい。カバー４３の開口の大きさは、ナット４２ｂの形状よりも若干小さくなるように形成してもよい。これにより、カバー４３の開口に配置されたナット４２ｂがボルト４２ａに対して回転すると、カバー４３もナット４２ｂの回転とともに回転する。 Further, as shown in FIGS. 5A and 5B, the fastening member 42 is entirely covered with a cover 43. The cover 43 is made of, for example, a soft resin such as ABS (Acrylonitrile Butadiene Styrene) resin, and partly has the same shape as the nut 42b and slightly smaller than the size of the nut 42b (not shown). Is formed. The nut 42b contacts this opening. The nut 42b may be fixed to the opening portion of the cover 43 or may not be fixed. The size of the opening of the cover 43 may be formed to be slightly smaller than the shape of the nut 42b. Thereby, when the nut 42b arrange | positioned at the opening of the cover 43 rotates with respect to the volt | bolt 42a, the cover 43 will also rotate with rotation of the nut 42b.
　また、カバー４３の外側には、永久磁石４１が固着されている。永久磁石４１は、図５の（ａ）および（ｂ）に示すように、カバー４３を介して、異常を検出したい締結部材４２の側面に接着により固着されている。したがって、ナット４２ｂの回転に伴ってカバー４３に固着された永久磁石４１も回転する。 Further, a permanent magnet 41 is fixed to the outside of the cover 43. As shown in FIGS. 5A and 5B, the permanent magnet 41 is fixed to the side surface of the fastening member 42 whose abnormality is to be detected via a cover 43 by adhesion. Therefore, the permanent magnet 41 fixed to the cover 43 also rotates with the rotation of the nut 42b.
　ここで、図５の（ｂ）に示すように、ナット４２ｂが弛みを生じていない場合には、永久磁石４１はセンサ部３１と対向する位置に配置されるため、センサ部３１により永久磁石４１から発生する磁気を検出することができる。一方、図６Ａに示すように、ナット４２ｂが１回転弛み、永久磁石４１が再びセンサ部３１と対向する位置に配置された場合には、永久磁石４１は高さ方向においてセンサ部３１と対向する位置に配置されないため、センサ部３１では永久磁石４１から発生する磁気を検出することができない。したがって、ナット４２ｂがボルト４２ａに対して弛んでいるという締結状態の異常を検出することができる。 Here, as shown in FIG. 5B, when the nut 42 b is not loosened, the permanent magnet 41 is disposed at a position facing the sensor unit 31, and thus the permanent magnet 41 is arranged by the sensor unit 31. The magnetism generated from the can be detected. On the other hand, as shown in FIG. 6A, when the nut 42b is loosened once and the permanent magnet 41 is disposed again at a position facing the sensor unit 31, the permanent magnet 41 faces the sensor unit 31 in the height direction. Since the sensor unit 31 is not disposed at the position, the magnetism generated from the permanent magnet 41 cannot be detected. Therefore, it is possible to detect an abnormality in the fastening state in which the nut 42b is loose with respect to the bolt 42a.
　なお、センサ部３１および永久磁石４１は、センサ部３１の厚さと永久磁石４１の厚さとの和が、ボルト４２ａおよびナット４２ｂねじ山のリード長より小さい値となるように形成されていることに限らず、例えば、Ｎ回転したときに締結部材４２の締結状態の異常を検出することができる厚さとしてもよい。これにより、ナット４２ｂが弛みＮ回転し、センサ部３１と対向する位置に配置された永久磁石４１が再びセンサ部３１と対向する位置に配置された場合であっても、締結状態の異常を検出することができる。 The sensor unit 31 and the permanent magnet 41 are formed so that the sum of the thickness of the sensor unit 31 and the thickness of the permanent magnet 41 is smaller than the lead length of the bolt 42a and the nut 42b thread. For example, the thickness may be such that an abnormality in the fastening state of the fastening member 42 can be detected when N rotations are performed. Thereby, even if the nut 42b is loosened and rotates N times and the permanent magnet 41 disposed at the position facing the sensor unit 31 is disposed again at the position facing the sensor unit 31, an abnormality in the fastening state is detected. can do.
　また、センサ部３１の高さ方向の厚さは、永久磁石４１の高さ方向の厚さよりも薄く、さらに、センサ部３１の配置位置の下端（基板１７からの距離）は、基板１７を基準面として、基板１７から永久磁石４１の厚さ分の高さよりも高い位置となるように配置してもよい。 Further, the thickness in the height direction of the sensor unit 31 is thinner than the thickness in the height direction of the permanent magnet 41, and the lower end (distance from the substrate 17) of the arrangement position of the sensor unit 31 is based on the substrate 17. You may arrange | position so that it may become a position higher than the height for the thickness of the permanent magnet 41 from the board | substrate 17 as a surface.
　これにより、図６Ｂに示すように、永久磁石４１がカバー４３から脱落した場合に、センサ部３１と永久磁石４１とは対向しなくなるため、センサ部３１では永久磁石４１から発生する磁気を検出することができない。したがって、永久磁石４１がカバー４３から脱落したという異常を検出することができる。 As a result, as shown in FIG. 6B, when the permanent magnet 41 is removed from the cover 43, the sensor unit 31 and the permanent magnet 41 do not face each other, so the sensor unit 31 detects magnetism generated from the permanent magnet 41. I can't. Therefore, an abnormality that the permanent magnet 41 has dropped from the cover 43 can be detected.
　（実施の形態３）
　次に、実施の形態３について、図７～図９を用いて説明する。図７は、本実施の形態にかかるセンサシステム１００の構成を示すブロック図である。図８は、本実施の形態にかかるセンサシステム１００の構成を示す概略図であり、（ａ）は平面図、（ｂ）はカバー１３０を通してセンサユニット１１０を透視した正面図である。なお、図８の（ｂ）では、センサユニットの構成を透視して示している。図９は、本実施の形態にかかるセンサシステム１００の構成の詳細を示す概略図であり、（ａ）はセンサユニット１１０の正面図、（ｂ）は内蓋１３５側からみたときのセンサユニット１１０の平面図、（ｃ）は内蓋１３５側から見たときの締結部材１２２の平面図である。 (Embodiment 3)
Next, Embodiment 3 will be described with reference to FIGS. FIG. 7 is a block diagram showing a configuration of the sensor system 100 according to the present embodiment. FIG. 8 is a schematic diagram illustrating the configuration of the sensor system 100 according to the present embodiment, where (a) is a plan view and (b) is a front view seen through the sensor unit 110 through a cover 130. In FIG. 8B, the configuration of the sensor unit is shown through. FIG. 9 is a schematic diagram showing details of the configuration of the sensor system 100 according to the present embodiment, where (a) is a front view of the sensor unit 110, and (b) is the sensor unit 110 when viewed from the inner lid 135 side. FIG. 6C is a plan view of the fastening member 122 when viewed from the inner lid 135 side.
　本実施の形態にかかるセンサシステム１００が実施の形態１に示したセンサシステム１と異なる点は、締結部材１２２に、永久磁石１２１ではなくセンサユニット１１０が固着されている点である。 The sensor system 100 according to the present embodiment is different from the sensor system 1 shown in the first embodiment in that the sensor unit 110 is fixed to the fastening member 122 instead of the permanent magnet 121.
　図７に示すように、本実施の形態にかかるセンサシステム１００は、センサユニット１１０と磁気発生物１２０とで構成されている。 As shown in FIG. 7, the sensor system 100 according to this embodiment includes a sensor unit 110 and a magnetic product 120.
　センサユニット１１０は、実施の形態１に示したセンサユニット１０と同様、センサ部１１１と、判定部１１２と、通信回路部１１３と、アンテナ部１１４と、電池１１５とを備えている。判定部１１２、通信回路部１１３、アンテナ部１１４および電池１１５は、基板１１７上に配置されている。また、基板１１７には、判定部１１２、通信回路部１１３、アンテナ部１１４および電池１１５を接続する配線（図示せず）が形成されている。 The sensor unit 110 includes a sensor unit 111, a determination unit 112, a communication circuit unit 113, an antenna unit 114, and a battery 115, like the sensor unit 10 shown in the first embodiment. The determination unit 112, the communication circuit unit 113, the antenna unit 114, and the battery 115 are disposed on the substrate 117. Further, wiring (not shown) for connecting the determination unit 112, the communication circuit unit 113, the antenna unit 114, and the battery 115 is formed on the substrate 117.
　なお、センサ部１１１、判定部１１２、通信回路部１１３、アンテナ部１１４および電池１１５の各構成については実施の形態１に示したセンサ部１１、判定部１２、通信回路部１３、アンテナ部１４および電池１５と同様であるため、詳細な説明は省略する。 Note that the sensor unit 111, the determination unit 112, the communication circuit unit 113, the antenna unit 114, and the battery 115 are configured in the sensor unit 11, the determination unit 12, the communication circuit unit 13, the antenna unit 14, and the battery unit 115 described in the first embodiment. Since it is the same as the battery 15, detailed description is abbreviate | omitted.
　また、磁気発生物１２０は、例えば永久磁石１２１で構成されている。永久磁石１２１の構成は、実施の形態１に示した永久磁石２１と同様であるため、詳細な説明は省略する。 Further, the magnetic generator 120 is composed of, for example, a permanent magnet 121. Since the configuration of the permanent magnet 121 is the same as that of the permanent magnet 21 shown in the first embodiment, detailed description thereof is omitted.
　締結部材１２２は、実施の形態１に示した締結部材２２と同様、例えば、ボルト１２２ａおよびナット１２２ｂで構成されている。また、締結部材１２２は、カバー１３０を備えている。カバー１３０は、例えばＡＢＳ樹脂などの軟質性の樹脂により形成されている。カバー１３０は、締結部材１２２を覆うとともに、センサユニット１１０を内蔵している。つまり、締結部材１２２とセンサユニット１１０とは、カバー１３０の内部に包まれている。 The fastening member 122 is comprised by the bolt 122a and the nut 122b, for example like the fastening member 22 shown in Embodiment 1. FIG. The fastening member 122 includes a cover 130. The cover 130 is made of a soft resin such as ABS resin. The cover 130 covers the fastening member 122 and incorporates the sensor unit 110. That is, the fastening member 122 and the sensor unit 110 are enclosed in the cover 130.
　詳細には、図８の（ａ）および（ｂ）に示すように、センサユニット１１０と締結部材１２２は、カバー１３０の中に組み込まれている。また、図８の（ａ）に示すように、カバー１３０の外側には、カバー１３０内部のセンサ部１１１が存在する位置を示す目印となる矢印１３１が設けられている。矢印１３１は、永久磁石１２１と対向する位置に、永久磁石１２１のほうに矢印の先端が向くように設けられている。矢印１３１は、例えば、紙のシールなどを貼付したものであってもよいし、カバー１３０に直接凹部を形成したりインクで書いたりしたものであってもよい。 Specifically, as shown in FIGS. 8A and 8B, the sensor unit 110 and the fastening member 122 are incorporated in the cover 130. Further, as shown in FIG. 8A, an arrow 131 serving as a mark indicating a position where the sensor unit 111 exists inside the cover 130 is provided on the outside of the cover 130. The arrow 131 is provided at a position facing the permanent magnet 121 so that the tip of the arrow faces the permanent magnet 121. The arrow 131 may be, for example, a paper sticker or the like, or may be formed by forming a recess directly on the cover 130 or writing it with ink.
　カバー１３０は、図８の（ｂ）に示すように、外壁で囲まれた一部に開口を有し、内部に内蓋１３５を有している。内蓋１３５により、カバー１３０の内側は、開口側と、開口側と反対側の奥側との２つの領域に分割されている。カバー１３０の内側の奥側の領域にはセンサユニット１１０が収容され、カバー１３０の内側の開口側の領域で締結部材１２２を覆い、固着することができる。 As shown in FIG. 8B, the cover 130 has an opening in a part surrounded by the outer wall, and an inner lid 135 inside. The inner lid 135 divides the inside of the cover 130 into two regions, that is, an opening side and a back side opposite to the opening side. The sensor unit 110 is accommodated in a region on the back side inside the cover 130, and the fastening member 122 can be covered and fixed in a region on the opening side inside the cover 130.
　センサユニット１１０は、センサ部１１１、判定部１１２、通信回路部１１３、アンテナ部１１４および電池１１５が内蓋１３５と対向するように、基板１１７がカバー１３０の奥側に接着剤等で固着されている。そして、センサユニット１１０は、樹脂１３６によりカバー１３０内に埋められている。樹脂１３６は、例えばシリコーン樹脂などの軟質性の樹脂である。また、樹脂１３６により埋められた部分は、さらに内蓋１３５により覆われている。これにより、センサユニット１１０は、カバー１３０と内蓋１３５との間に封入されている。 In the sensor unit 110, the substrate 117 is fixed to the inner side of the cover 130 with an adhesive or the like so that the sensor unit 111, the determination unit 112, the communication circuit unit 113, the antenna unit 114, and the battery 115 face the inner lid 135. Yes. The sensor unit 110 is buried in the cover 130 with a resin 136. The resin 136 is a soft resin such as a silicone resin. The portion filled with the resin 136 is further covered with an inner lid 135. As a result, the sensor unit 110 is sealed between the cover 130 and the inner lid 135.
　また、図８の（ｂ）および図９の（ａ）に示すように、判定部１１２、通信回路部１１３、アンテナ部１１４および電池１１５は、基板１１７上に配置されているが、センサ部１１１は基板１１７上に配置されていない。センサ部１１１は、図８の（ｂ）および図９の（ｂ）に示すように、配線１１９により基板１１７上に設けられた端子１１８と接続されている。センサ部１１１は、配線１１９および端子１１８を介して、判定部１１２に接続されている。この構成によると、センサ部１１１は、基板１１７の上に設けられる必要はないので、カバー１３０の内側において所望の高さの位置に固定することができる。センサ部１１１は、カバー１３０に接着剤等で固着されてもよいし、カバー１３０の内側に埋め込まれてもよい。 8B and FIG. 9A, the determination unit 112, the communication circuit unit 113, the antenna unit 114, and the battery 115 are arranged on the substrate 117, but the sensor unit 111. Are not arranged on the substrate 117. As shown in FIG. 8B and FIG. 9B, the sensor unit 111 is connected to a terminal 118 provided on the substrate 117 by a wiring 119. The sensor unit 111 is connected to the determination unit 112 via the wiring 119 and the terminal 118. According to this configuration, the sensor unit 111 does not need to be provided on the substrate 117, and can be fixed at a desired height inside the cover 130. The sensor unit 111 may be fixed to the cover 130 with an adhesive or the like, or may be embedded inside the cover 130.
　また、図９の（ｃ）に示すように、カバー１３０の内側の開口側の領域は、開口の形状がナット１２２ｂの形状に合わせた形状となるように、ナット１２２ｂが配置される位置とカバー１３０との間に、軟質性の樹脂が充填された樹脂部１３７が設けられている。なお、ナット１２２ｂは、樹脂部１３７によりカバー１３０の開口側に固着されてもよいし、固着されなくてもよい。カバー１３０の開口の大きさがナット１２２ｂの形状よりも若干小さくなるように、樹脂部１３７を形成してもよい。 Further, as shown in FIG. 9C, the area on the inner opening side of the cover 130 and the position where the nut 122b is arranged and the cover so that the shape of the opening matches the shape of the nut 122b. Between 130, a resin portion 137 filled with a soft resin is provided. The nut 122b may be fixed to the opening side of the cover 130 by the resin portion 137 or may not be fixed. The resin portion 137 may be formed so that the size of the opening of the cover 130 is slightly smaller than the shape of the nut 122b.
　これにより、カバー１３０の開口に配置されたナット１２２ｂがボルト１２２ａに対して回転すると、カバー１３０もナット１２２ｂの回転とともに回転する。したがって、ナット１２２ｂの回転に伴ってカバー１３０に固着されたセンサ部１１１も回転する。 Thus, when the nut 122b disposed in the opening of the cover 130 rotates with respect to the bolt 122a, the cover 130 also rotates with the rotation of the nut 122b. Accordingly, the sensor unit 111 fixed to the cover 130 also rotates with the rotation of the nut 122b.
　磁気発生物１２０は、永久磁石１２１で構成されている。永久磁石１２１は、実施の形態１に示した永久磁石２１と同様であるため、詳細な説明を省略する。永久磁石１２１は、構造物に接着剤等で接着されている。なお、永久磁石１２１の形状および大きさは、永久磁石１２１を取り付ける構造物の大きさ、構造物における取り付け位置および領域の大きさによって適宜変更してもよい。例えば、永久磁石１２１を取り付ける位置が狭い場合には、永久磁石１２１の大きさを小さくしてもよい。永久磁石を取り付ける高さは、ナット１２２ｂをボルト１２２ａに対して締めたときの、センサ部１１１の高さとほぼ同じ高さになるように設定するとよい。 The magnetic product 120 is composed of a permanent magnet 121. Since the permanent magnet 121 is the same as the permanent magnet 21 shown in the first embodiment, a detailed description thereof is omitted. The permanent magnet 121 is bonded to the structure with an adhesive or the like. The shape and size of the permanent magnet 121 may be appropriately changed depending on the size of the structure to which the permanent magnet 121 is attached, the attachment position in the structure, and the size of the region. For example, when the position where the permanent magnet 121 is attached is narrow, the size of the permanent magnet 121 may be reduced. The height at which the permanent magnet is attached may be set to be substantially the same as the height of the sensor unit 111 when the nut 122b is fastened to the bolt 122a.
　また、センサ部１１１および永久磁石１２１は、実施の形態２に示したセンサシステムと同様、ナット１２２ｂがボルト１２２ａに対して１回転した状態を検出できるような高さとしてもよい。例えば、センサ部１１１の厚さと永久磁石１２１の厚さとの和は、ボルト１２２ａおよびナット１２２ｂのねじ山のリード長より小さいこととしてもよい。 Also, the sensor unit 111 and the permanent magnet 121 may have a height that can detect a state in which the nut 122b rotates once with respect to the bolt 122a, as in the sensor system shown in the second embodiment. For example, the sum of the thickness of the sensor unit 111 and the thickness of the permanent magnet 121 may be smaller than the lead length of the thread of the bolt 122a and the nut 122b.
　なお、本実施の形態にかかるセンサシステム１００によって締結部材１２２の締結状態の異常を検出する方法、および、センサシステム１００を設置する手順は、実施の形態１に示したセンサシステム１と同様であるので、詳細な説明は省略する。 Note that the method for detecting an abnormality in the fastening state of the fastening member 122 by the sensor system 100 according to the present embodiment and the procedure for installing the sensor system 100 are the same as those in the sensor system 1 described in the first embodiment. Therefore, detailed description is omitted.
　以上、本実施の形態に係るセンサシステム１００によると、磁気発生物１２０を構成する永久磁石１２１は締結部材１２２と別に配置され、センサユニット１１０は締結部材１２２と一体に構成されるため、締結部材１２２側に空きスペースが多く、永久磁石１２１側に空きスペースが小さい場合であっても、磁気発生物１２０の位置をセンサユニット１１０で検出することができる。 As described above, according to the sensor system 100 according to the present embodiment, the permanent magnet 121 constituting the magnetic product 120 is arranged separately from the fastening member 122, and the sensor unit 110 is configured integrally with the fastening member 122. Even when there is a lot of free space on the 122 side and small space on the permanent magnet 121 side, the position of the magnetic product 120 can be detected by the sensor unit 110.
　（その他変形例等）
　以上、本発明に係るセンサシステムおよびセンサユニットについて、実施の形態に基づいて説明したが、本発明は、上述した実施の形態に限定されるものではない。 (Other variations)
As mentioned above, although the sensor system and sensor unit which concern on this invention were demonstrated based on embodiment, this invention is not limited to embodiment mentioned above.
　例えば、上述した実施の形態では、締結部材をねじ山が形成されたボルトおよびナットとしたが、締結部材は、ねじ山が形成されていないカシメであってもよい。また、ボルトのみ、ナットのみの構成であってもよい。 For example, in the above-described embodiment, the fastening member is a bolt and a nut on which a thread is formed, but the fastening member may be a caulking on which no thread is formed. Moreover, the structure only of a volt | bolt and only a nut may be sufficient.
　また、上述した実施の形態では、センサ部を、ホール素子を用いた磁気センサとしたが、磁気センサは、ホール素子を用いた構成に限らず、指向性を備えた磁気センサであればよく、例えばコイルを用いた構成など他の構成であってもよい。 In the above-described embodiment, the sensor unit is a magnetic sensor using a Hall element. However, the magnetic sensor is not limited to a configuration using a Hall element, and may be any magnetic sensor having directivity. For example, other configurations such as a configuration using a coil may be used.
　また、上述した実施の形態では、磁気発生物を永久磁石としたが、磁気発生物２０は、永久磁石に限らず、例えば電磁石など他の磁気発生物であってもよい。また、締結部材自体が永久磁石などの磁気発生物で形成されていてもよい。 In the above-described embodiment, the magnetic product is a permanent magnet. However, the magnetic product 20 is not limited to a permanent magnet, and may be another magnetic product such as an electromagnet. The fastening member itself may be formed of a magnetic product such as a permanent magnet.
　また、上述した実施の形態では、永久磁石を固着する位置は、ナットにおいて、センサ部と対向しセンサ部に最も近接する位置に限らず、ナットと対向しない位置であってもよい。 In the above-described embodiment, the position where the permanent magnet is fixed is not limited to the position facing the sensor portion and closest to the sensor portion in the nut, but may be a position not facing the nut.
　また、上述した実施の形態では、１回目のセンサ部による磁気の読み取り値と２回目のセンサ部よる磁気の読み取り値の中間値を、異常検出閾値として設定したが、異常検出閾値は、他の値であってもよく、例えば、１回目のセンサ部による磁気の読み取り値と２回目のセンサ部よる磁気の読み取り値の間の所定値であればよい。 In the above-described embodiment, the intermediate value between the magnetic reading value obtained by the first sensor unit and the magnetic reading value obtained by the second sensor unit is set as the abnormality detection threshold value. For example, it may be a predetermined value between the magnetic reading value by the first sensor unit and the magnetic reading value by the second sensor unit.
　また、上述した実施の形態では、判定部は、センサ部により読み取った永久磁石の磁気の読み取り値が設定した異常検出閾値以上の場合に、永久磁石の位置は変化しておらず、ナットは弛んでいないと判定し、センサ部により読み取った永久磁石の磁気の読み取り値が設定した異常検出閾値より小さい場合に、永久磁石の位置は変化しており、ナットは弛んでいると判定したが、判定部は、永久磁石の取り付け位置に応じて、例えば、センサ部により読み取った永久磁石の磁気の読み取り値が設定した異常検出閾値以下の場合に、永久磁石の位置は変化しておらず、ナットは弛んでいないと判定し、センサ部により読み取った永久磁石の磁気の読み取り値が設定した異常検出閾値より大きい場合に、永久磁石の位置は変化しており、ナットは弛んでいると判定してもよい。 In the above-described embodiment, the determination unit determines that the position of the permanent magnet is not changed and the nut is loosened when the magnetic reading value of the permanent magnet read by the sensor unit is equal to or greater than the set abnormality detection threshold value. If the magnetic reading value of the permanent magnet read by the sensor unit is smaller than the set abnormality detection threshold, it is determined that the position of the permanent magnet has changed and the nut is loose. The position of the permanent magnet is not changed according to the attachment position of the permanent magnet, for example, when the magnetic reading value of the permanent magnet read by the sensor portion is equal to or less than the set abnormality detection threshold, and the nut is not When it is determined that the magnet is not loose and the magnetic reading value of the permanent magnet read by the sensor unit is larger than the set abnormality detection threshold, the position of the permanent magnet has changed, and the nut It may be determined that the slack.
　また、上述した実施の形態では、センサ部の厚さと永久磁石の厚さとの和は、ボルトおよびナットのねじ山のリード長より小さいとしたが、これに限らず、例えば、Ｎ回転したときに締結部材の締結状態の異常を検出することができる厚さとしてもよい。 In the above-described embodiment, the sum of the thickness of the sensor portion and the thickness of the permanent magnet is smaller than the lead length of the screw thread of the bolt and nut. However, the present invention is not limited to this. The thickness may be such that an abnormality in the fastening state of the fastening member can be detected.
　また、締結部材には磁気発生物が固着されてもよいし、センサユニットが固着されてもよい。 Further, a magnetic product may be fixed to the fastening member, or the sensor unit may be fixed.
　また、締結部材にはカバーが取り付けられてもよいし、また、カバーにセンサユニットが収容されてもよい。 Further, a cover may be attached to the fastening member, and a sensor unit may be accommodated in the cover.
　その他、上述の実施の形態に対して当業者が思いつく各種変形を施して得られる形態、または、本発明の趣旨を逸脱しない範囲で上述の実施の形態における構成要素及び機能を任意に組み合わせることで実現される形態も本発明に含まれる。 In addition, a form obtained by making various modifications conceived by those skilled in the art to the above-described embodiment, or by arbitrarily combining the components and functions in the above-described embodiment without departing from the spirit of the present invention. Implemented forms are also included in the present invention.
　本発明にかかるセンサシステムおよびセンサユニットは、橋梁・標識・看板等、風や交通に伴う振動を受け続ける構造物を他の構造物に締結するためのアンカーボルト、ボルトおよびナット等の弛みを検出するセンサシステムまたはセンサユニットとして有用である。 The sensor system and sensor unit according to the present invention detects looseness of anchor bolts, bolts, nuts, etc. for fastening a structure that continues to receive vibrations caused by wind and traffic, such as bridges, signs, signboards, etc., to other structures. It is useful as a sensor system or sensor unit.
　１、１００　センサシステム
　１０、３０、１１０　センサユニット
　１１、３１、１１１　センサ部
　１２、１１２　判定部
　１３、１１３　通信回路部（送信部）
　１４、１１４　アンテナ部（送信部）
　１５、１１５　電池
　１７、１１７　基板
　１８　ケース
　２０、４０、１２０　磁気発生物
　２１、４１、１２１　永久磁石
　２２、４２、１２２　締結部材
　２２ａ、４２ａ、１２２ａ　ボルト
　２２ｂ、４２ｂ、１２２ｂ　ナット
　３２　支持部
　４３、１３０　カバー
　１３１　矢印
　１３５　内蓋
　１３６　樹脂
　１３７　樹脂部 DESCRIPTION OF SYMBOLS 1,100 Sensor system 10, 30, 110 Sensor unit 11, 31, 111 Sensor part 12, 112 Judgment part 13, 113 Communication circuit part (transmission part)
14, 114 Antenna unit (transmitting unit)
15, 115 Battery 17, 117 Substrate 18 Case 20, 40, 120 Magnetic product 21, 41, 121 Permanent magnet 22, 42, 122 Fastening member 22a, 42a, 122a Bolt 22b, 42b, 122b Nut 32 Support part 43, 130 Cover 131 Arrow 135 Inner lid 136 Resin 137 Resin part

Claims (7)

  1. 　締結部材の締結状態の異常を検出するセンサシステムであって、
    　前記センサシステムは、
    　磁気を発生する磁気発生物と、
    　前記磁気発生物までの距離に対応する前記磁気を検出し、検出した前記磁気の大きさと予め定められた閾値とから、前記締結部材の締結状態の異常を検出するセンサユニットとを備え、
    　前記磁気発生物および前記センサユニットのうちの一方は、前記締結部材に固着され、前記締結部材の動作に基づいて前記磁気発生物および前記センサユニットのうちの他方との間の距離が変化するように移動する
    　センサシステム。     A sensor system for detecting an abnormality in a fastening state of a fastening member,
    The sensor system includes:
    A magnetic generator that generates magnetism;
    A sensor unit that detects the magnetism corresponding to the distance to the magnetic generation object, and detects an abnormality in the fastening state of the fastening member from the magnitude of the detected magnetism and a predetermined threshold;
    One of the magnetic product and the sensor unit is fixed to the fastening member, and the distance between the magnetic product and the other of the sensor unit changes based on the operation of the fastening member. Move to the sensor system.
  2. 　前記磁気発生物は、永久磁石である
    　請求項１に記載のセンサシステム。     The sensor system according to claim 1, wherein the magnetic product is a permanent magnet.
  3. 　請求項１または２に記載のセンサシステムに用いられるセンサユニットであって、
    　前記センサユニットは、
    　前記磁気を検出するセンサ部と、
    　前記センサ部により検出した前記磁気の大きさを前記閾値と比較することにより前記締結部材の締結状態の異常の有無を判定する判定部とを備える
    　センサユニット。     A sensor unit used in the sensor system according to claim 1 or 2,
    The sensor unit is
    A sensor unit for detecting the magnetism;
    A determination unit that determines whether or not there is an abnormality in the fastening state of the fastening member by comparing the magnitude of the magnetism detected by the sensor unit with the threshold value;
  4. 　前記判定部は、前記センサ部により検出した前記磁気の大きさが前記閾値より小さい場合に、前記締結部材の締結状態を異常有りと判定する
    　請求項３に記載のセンサユニット。     The sensor unit according to claim 3, wherein the determination unit determines that the fastening state of the fastening member is abnormal when the magnitude of the magnetism detected by the sensor unit is smaller than the threshold value.
  5. 　前記締結部材は、ねじ山が形成されたボルトまたはナットであり、
    　前記センサ部の厚さは、前記磁気発生物の厚さとの和が前記ねじ山のリード長より小さくなるように形成されている
    　請求項３または４に記載のセンサユニット。     The fastening member is a bolt or nut formed with a thread,
    5. The sensor unit according to claim 3, wherein a thickness of the sensor unit is formed such that a sum of the thickness of the magnetic product and the thickness of the magnetic product is smaller than a lead length of the screw thread.
  6. 　前記センサ部は、前記センサ部の下端が、基準面から前記磁気発生物の厚さ分の高さよりも高い位置になるように設置されている
    　請求項３～５のいずれか１項に記載のセンサユニット。     The sensor unit according to any one of claims 3 to 5, wherein the sensor unit is installed such that a lower end of the sensor unit is positioned higher than a height corresponding to a thickness of the magnetic product from a reference plane. Sensor unit.
  7. 　前記判定部により判定した前記締結部材の締結状態の異常の有無を送信する送信部をさらに備える
    　請求項３～６のいずれか１項に記載のセンサユニット。     The sensor unit according to any one of claims 3 to 6, further comprising a transmission unit configured to transmit presence / absence of abnormality in the fastening state of the fastening member determined by the determination unit.
PCT/JP2016/079029 2015-12-16 2016-09-30 Sensor system and sensor unit WO2017104223A1 (en)

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JP2015145806A (en) * 2014-02-03 2015-08-13 株式会社共和電業 Screw looseness detection device and screw looseness monitoring system
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