WO2017104223A1 - Système de capteur et unité de capteur - Google Patents

Système de capteur et unité de capteur Download PDF

Info

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
Authority
WO
WIPO (PCT)
Prior art keywords
sensor unit
fastening member
sensor
permanent magnet
abnormality
Prior art date
Application number
PCT/JP2016/079029
Other languages
English (en)
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
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
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/fr

Links

Images

Classifications

    • 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.

Landscapes

  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Mechanical Engineering (AREA)
  • Geophysics And Detection Of Objects (AREA)

Abstract

L'invention concerne un système de capteur (1) qui détecte une anomalie de l'état de fixation d'un élément de fixation (22). Le système de capteur (1) comprend : une substance générant du magnétisme (20) qui génère du magnétisme ; et une unité de capteur (10), qui détecte le magnétisme correspondant à la distance à la substance générant du magnétisme (20), et détecte l'anomalie de l'état de fixation de l'élément de fixation (22) sur la base de l'amplitude du magnétisme ainsi détecté, et d'une valeur seuil prédéterminée. Un élément parmi la substance générant du magnétisme (20) et l'unité de capteur (10) est fixé à l'élément de fixation (22), et se déplace de telle sorte que la distance par rapport à l'autre élément parmi la substance générant du magnétisme (20) et l'unité de capteur (10) change en fonction d'opérations de l'élément de fixation (22).
PCT/JP2016/079029 2015-12-16 2016-09-30 Système de capteur et unité de capteur WO2017104223A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2015-245519 2015-12-16
JP2015245519 2015-12-16

Publications (1)

Publication Number Publication Date
WO2017104223A1 true WO2017104223A1 (fr) 2017-06-22

Family

ID=59056508

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/JP2016/079029 WO2017104223A1 (fr) 2015-12-16 2016-09-30 Système de capteur et unité de capteur

Country Status (1)

Country Link
WO (1) WO2017104223A1 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2018070153A (ja) * 2016-10-28 2018-05-10 マクリーン−フォグ カンパニー ホイールファスナアラーム
IT202100012371A1 (it) * 2021-05-13 2022-11-13 Vt100 S R L Dispositivo di bloccaggio

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US8922199B2 (en) * 2012-07-26 2014-12-30 Austin R&D, Inc. Magnetic sensing device for fasteners
JP2015145806A (ja) * 2014-02-03 2015-08-13 株式会社共和電業 ねじ緩み検知装置およびねじ緩み監視システム
JP2015200560A (ja) * 2014-04-08 2015-11-12 株式会社共和電業 ねじ緩み検知装置およびねじ緩み監視システム
JP2015219081A (ja) * 2014-05-16 2015-12-07 株式会社共和電業 センサ付きボルト、センサ付きナット、ねじ緩みもしくはねじ離脱検知装置およびねじ緩みもしくはねじ離脱監視システム

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US8922199B2 (en) * 2012-07-26 2014-12-30 Austin R&D, Inc. Magnetic sensing device for fasteners
JP2015145806A (ja) * 2014-02-03 2015-08-13 株式会社共和電業 ねじ緩み検知装置およびねじ緩み監視システム
JP2015200560A (ja) * 2014-04-08 2015-11-12 株式会社共和電業 ねじ緩み検知装置およびねじ緩み監視システム
JP2015219081A (ja) * 2014-05-16 2015-12-07 株式会社共和電業 センサ付きボルト、センサ付きナット、ねじ緩みもしくはねじ離脱検知装置およびねじ緩みもしくはねじ離脱監視システム

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2018070153A (ja) * 2016-10-28 2018-05-10 マクリーン−フォグ カンパニー ホイールファスナアラーム
JP7092486B2 (ja) 2016-10-28 2022-06-28 マクリーン－フォグ カンパニー ホイールファスナアラーム
IT202100012371A1 (it) * 2021-05-13 2022-11-13 Vt100 S R L Dispositivo di bloccaggio

Similar Documents

Publication Publication Date Title
JP6544486B2 (ja) 磁気マーカ及び運転支援システム
JP5414333B2 (ja) 電流検出装置の組付け構造
JP4544087B2 (ja) 電流センサの取り付け構造
US6809513B2 (en) Rotary position sensor having waterproof, explosion-protective structure
EP2843358A1 (fr) Dispositif d'aimant et système de détection de position
WO2017104223A1 (fr) Système de capteur et unité de capteur
CN106023496B (zh) 一种用于电子围栏的角度报警装置
KR20140008618A (ko) 압전필름을 이용한 볼트 풀림 감지 장치
JPWO2019044280A1 (ja) 出力システム及び計器
CN106097620B (zh) 一种用于电子围栏的位移报警装置
EP3006285A1 (fr) Commutateur de type magnétique
JP6101138B2 (ja) バッテリターミナル一体型電流センサ
JP2009168723A (ja) 電流センサの取付構造
JP2009015683A (ja) 検出装置
JP2007218862A (ja) 回転検出センサ
CN104340072A (zh) 具有装备磁体的指针的车辆仪表板
JP6071503B2 (ja) ラッチングリレー及び電力量計
CN205942960U (zh) 一种旋转位置报警装置
US20040263151A1 (en) Current sensor with a control device
JP3233129B2 (ja) 磁気検出装置
CN205942959U (zh) 一种相对平行位移报警装置
JP4967852B2 (ja) 磁気式エンコーダ及びモータ
KR101551468B1 (ko) 홀 센서가 구비된 브러시 홀더 장치
CN219625519U (zh) 电机转速检测电路以及传感器组件
JP6828704B2 (ja) 液体検出システムおよび液体検出方法

Legal Events

Date Code Title Description
121 Ep: the epo has been informed by wipo that ep was designated in this application

Ref document number: 16875208

Country of ref document: EP

Kind code of ref document: A1

NENP Non-entry into the national phase

Ref country code: DE

122 Ep: pct application non-entry in european phase

Ref document number: 16875208

Country of ref document: EP

Kind code of ref document: A1

NENP Non-entry into the national phase

Ref country code: JP