JP2020161124A - Looseness detection label and looseness detection structure - Google Patents

Abstract

To provide sufficient communication distance even if a tightening member is small in a configuration of detecting the looseness of the tightening member tightened to a component to be tightened via non-contact communication.SOLUTION: A looseness detection label 1 includes: a film substrate 10 including a strip-shaped attachment area 10a that is attached along a side of a bolt, an attachment area 10b that is next to the attachment area 10a and is attached from an upper surface to the side of the bolt, and an attachment area 10c that is next to the attachment area 10b and is attached to a base; an antenna 12 that is formed on the attachment area 10a of the film substrate 10 so as to extend in its longitudinal direction; looseness detection wiring 13 formed across the attachment areas 10b and 10c of the film 10; and an IC chip 11 that detects a conductive state of the looseness detection wiring 13 and performs non-contact transmission of the detection result via the antenna 12. The attachment area 10a has a length by which it does not overlap the attachment area 10b when the looseness detection label is attached across the bolt and the base.SELECTED DRAWING: Figure 1

Description

The present invention relates to a looseness detection label and a looseness detection structure that detect looseness of a tightening member tightened to a tightening target component via non-contact communication.

Generally, in a vehicle such as a railroad, there is a high possibility that a serious accident will occur if the bolt comes off during traveling. Therefore, conventionally, a skilled worker regularly performs a tapping sound inspection and a visual inspection using a check mark to inspect whether the bolt is loose. However, in such an inspection, there is a possibility that an inspection error may occur due to human factors such as the skill level of the worker and the labor shortage. Therefore, it is conceivable to inspect the looseness of bolts by using a sensor, but a large-scale device, a dedicated bolt, washer, jig, etc. are required.

In recent years, non-contact communication media using RFID technology such as non-contact IC labels and non-contact IC tags equipped with IC chips capable of writing and reading information in a non-contact state have been excellent. Due to its convenience, it is rapidly becoming widespread. Therefore, it is considered to use such RFID technology even when detecting the looseness of the bolt described above.

For example, in Patent Document 1, an IC tag is attached to a cap portion of a bolt, and a conductor piece made of metal or the like having an opening in a part thereof is attached to a ring fixed to a member to which the bolt is tightened. If there is no looseness, the IC tag faces the opening to enable reading to the IC tag, and if the bolt loosens, the bolt rotates so that the IC tag does not face the opening. Therefore, a technique for making it impossible to read the IC tag and thereby detecting looseness of the bolt is disclosed. By using this technology, loosening of bolts can be detected without the need for large-scale equipment, dedicated bolts, washers, jigs, or the like.

Japanese Patent No. 5324325

In a system using RFID technology as described above, communication distance is an important practical factor. In order to extend the communication distance, it is conceivable to increase the length of the communication antenna, but when RFID technology is used to detect loosening of the bolt as described above, the length of the communication antenna is bolt. Since it depends on the size of the antenna, there is a problem that the communication distance becomes short when the bolt is small.

It is possible to increase the length of the antenna by devising the antenna pattern, but if the bolt is small, there is a limit to devising the antenna pattern in a small area, and a sufficient communication distance can be obtained. There is a problem that it cannot be done.

The present invention has been made in view of the problems of the prior art as described above, and is used in a looseness detection label that detects looseness of a tightening member tightened to a tightening target component via non-contact communication. It is an object of the present invention to provide a loosening detection label and a loosening detection structure that make it easy to obtain a sufficient communication distance even when the tightening member is small.

In order to achieve the above object, the present invention
A looseness detection label that detects looseness of the tightening member tightened to the part to be tightened via non-contact communication.
An adhesive layer is laminated on one surface, and the band-shaped first region to be attached along the side surface of the tightening member and the first region extending in a direction orthogonal to the longitudinal direction of the first region. A second region which is connected to the first region and is attached so as to face the tightening member from the upper surface to the side surface thereof and the second region which is connected to the opposite side of the first region. Then, a base base material provided with a third region to be attached to the tightening target part, and
A communication antenna formed in the first region of the base base material so as to extend in the longitudinal direction of the first region.
Looseness detection wiring formed across the second region and the third region of the base base material, and
It is arranged in the second region of the sheet base material in connection with the communication antenna and the looseness detection wiring, detects the conduction state of the looseness detection wiring, and reports the detection result via the communication antenna. It has a detection means for non-contact transmission,
The first region has a length that does not overlap the second region when the loosening detection label is attached across the tightening member and the tightening target component.

In the present invention configured as described above, in a state where the tightening member is tightened to the part to be tightened, the strip-shaped first region of the base base material is attached along the side surface of the tightening member. , The second region of the base base material is attached so as to face them from the upper surface to the side surface of the tightening member, and further, the third region of the base base material is attached to the part to be tightened. After that, when the tightening member tightened to the tightening target part is loosened, the sheet base material is distorted between the second region and the third region. Loosening detection wiring is formed on the base base material across the second region and the third region, and the looseness detection wiring is in a conductive state when the base base material is not distorted. However, when the base base material is distorted, the base material is broken due to the strain, and the loosening detection wiring is broken, resulting in a non-conducting state. Then, the detection means detects the conduction state of the loosening detection wiring, and the detection result is transmitted non-contact via the communication antenna, so that the tightening member tightened to the tightening target component is loosened. Will be detected. At that time, since the communication antenna for non-contact transmission of the conduction state of the looseness detection wiring is formed so as to extend in the longitudinal direction of the band-shaped first region, the communication antenna is formed on the side surface of the tightening member. It has a shape that conforms to the above, which makes it easy to obtain a sufficient communication distance.

Further, it has an outer shape substantially the same as the shape of the upper surface of the tightening member, has a non-conductive member attached to a part of the second region of the base base material by an adhesive layer, and has a length of the first region. If the width in the direction orthogonal to the direction is substantially the same as the thickness of the non-conductive member, even if the tightening member is made of a conductive material, it is possible to avoid shortening the communication distance. Here, a so-called metal-compatible antenna has been put into practical use in order to suppress a decrease in communication distance when attached to a component made of a conductive material. However, metal-compatible antennas often have a hard structure because the dielectric and metamaterial are made of a sintered body, which makes the three-dimensional structure complicated to install and attaches to the axle. Assuming that, if the vehicle falls off the vehicle, the hard structure will blow off at high speed and the surrounding area will be in danger. Therefore, by using the non-conductive member, it is possible to avoid shortening the communication distance even if the tightening member is made of a conductive material without using a metal-compatible antenna.

Further, the communication antenna may be formed in the second region as well.

According to the present invention, the communication antenna for non-contact transmission of the conduction state of the looseness detection wiring is formed so as to extend in the longitudinal direction of the band-shaped first region, so that the communication antenna is tightened. It has a shape that follows the side surface of the member, which makes it easy to obtain a sufficient communication distance even when the tightening member is small.

Further, it has an outer shape substantially the same as the shape of the upper surface of the tightening member, has a non-conductive member attached to a part of the second region of the base base material by an adhesive layer, and has a length of the first region. If the width in the direction orthogonal to the direction is substantially the same as the thickness of the non-conductive member, even if the tightening member is made of a conductive material, it is possible to avoid shortening the communication distance. it can.

It is a figure which shows the 1st Embodiment of the looseness detection label of this invention, (a) is a top view, (b) is a side view seen from the A direction shown in (a). It is a figure which shows an example of the adherend to which the looseness detection label shown in FIG. 1 is attached, (a) is a top view, (b) is a side view seen from the direction of arrow A shown in (a). .. It is a figure which shows an example of the state which the looseness detection label shown in FIG. 1 is attached to the adherend shown in FIG. 2, (a) is a top view, (b) is from the direction A shown in (a). It is a side view as seen. It is a figure for demonstrating the action when the bolt loosens in the state where the looseness detection label shown in FIG. 1 is attached straddling the bolt and the base as shown in FIG. 3, (a). Is a top view, and (b) is a side view seen from the direction A shown in (a). In the looseness detection label shown in FIG. 1, as shown in FIG. 4, distortion is generated between the attachment area attached to the side surface of the spacer and the side surface of the head portion of the bolt and the attachment area attached to the base. It is a figure for demonstrating the action when. It is a figure which shows an example of the system for detecting looseness of a bolt with respect to a base using the looseness detection label shown in FIG. It is a flowchart for demonstrating the method of detecting looseness of a bolt with respect to a base using the looseness detection label shown in FIG. 1 in the system shown in FIG. It is a figure which shows the 2nd Embodiment of the looseness detection label of this invention, (a) is a top view, (b) is a side view seen from the A direction shown in (a). FIG. 8 is a diagram showing an example of a state in which the looseness detection label shown in FIG. 8 is attached to an adherend having the same shape as the adherend shown in FIG. 2, where (a) is a top view and (b) is a top view. It is a side view seen from the A direction shown in (a). It is a figure for demonstrating the action when a looseness occurs in a bolt in a state where the looseness detection label shown in FIG. 8 is stuck straddling the bolt and the base as shown in FIG. 9 (a). Is a top view, and (b) is a side view seen from the direction A shown in (a). It is a figure which shows the 3rd Embodiment of the looseness detection label of this invention, (a) is a top view, (b) is a side view seen from the A direction shown in (a). It is a figure which shows the 4th Embodiment of the looseness detection label of this invention, (a) is a top view, (b) is a side view seen from the A direction shown in (a). It is a figure which shows the 5th Embodiment of the looseness detection label of this invention, (a) is a top view, (b) is a side view seen from the A direction shown in (a).

Hereinafter, embodiments of the present invention will be described with reference to the drawings.

(First Embodiment)
1A and 1B are views showing a first embodiment of a looseness detection label of the present invention, in which FIG. 1A is a top view and FIG. 1B is a side view seen from the direction A shown in FIG.

As shown in FIG. 1, this embodiment is a looseness detection label 1 having a spacer 20 attached to one surface of a film substrate 10.

The film substrate 10 serves as a base base material in the present invention, and is made of, for example, a PET film having a thickness of 70 μm or the like. The film substrate 10 is configured such that the adhesive layer 30a serving as an adhesive layer is laminated by applying an adhesive to the entire surface of one surface, and the four adhesive regions 10a to 10d are connected in this order. Has been done.

The sticking region 10a is the first region in the present invention, has a band shape, and is provided with folded portions 16a to 16d at equal intervals in the longitudinal direction thereof. The surface of the attachment region 10a on the side opposite to the surface on which the adhesive layer 30a is laminated extends along the side surface of the attachment region 10a on the side of the connection side with the attachment region 10b in the longitudinal direction for communication. The antenna 12 is formed. The antenna 12 may have a shape of, for example, 3 × 50 mm.

The sticking region 10b is connected to the side side between the folded portions 16b and 16c of the sticking region 10a via the folded portion 15a so as to extend perpendicular to the longitudinal direction of the sticking region 10a. A loop portion 14 connected to the antenna 12 is formed on the surface of the attachment region 10b opposite to the surface on which the adhesive layer 30a is laminated, and for looseness detection over the attachment regions 10b to 10d. The wiring 13 is formed in a loop shape. Further, the IC chip 11 is mounted on the surface of the attachment region 10b where the loop portion 15 and the looseness detection wiring 13 are formed. A spacer 20 is attached by the adhesive layer 30a to the surface of the attachment region 10b opposite to the surface on which the loop portion 15 and the loosening detection wiring 13 are formed.

The loop portion 14 is composed of, for example, a loop-shaped wiring having an outer shape of 6 × 10 mm, and is connected to the antenna 12 and the IC chip 11.

One end of the looseness detection wiring 13 is connected to the IC chip 11, extends from there to the attachment area 10d via the attachment area 10b and the attachment area 10c, and is folded back at the attachment area 10d for attachment. It extends to the sticking region 10d via the region 10d and the sticking region 10c, and the other end is connected to the IC chip 11 to be formed.

The IC chip 11 serves as a detection means in the present invention, and is provided with two antenna terminals (not shown) and two looseness detection terminals (not shown), and these antenna terminals and looseness detection are provided. The surface on which the terminal is provided serves as a mounting surface, and the film substrate 10 is mounted on the surface on which the loop portion 15 and the looseness detection wiring 13 are formed. The antenna terminals of the IC chip 11 are each connected to the antenna 12 via the loop portion 14, and the looseness detection terminals of the IC chip 11 are connected to both ends of the looseness detection wiring 13. The IC chip 11 detects the resistance value of the loosening detection wiring 13 by passing a current due to electric power obtained by non-contact communication via the antenna 12 through the loosening detection wiring 13, and based on the resistance value, the IC chip 11 is used for loosening detection. The conduction state of the wiring 13 is detected, the detection result is converted into digital information, and non-contact transmission is performed via the antenna 12.

The spacer 20 is a non-conductive member in the present invention, and has a regular hexagonal shape substantially the same as the shape of the upper surface of a bolt serving as a tightening member to which the looseness detection label 1 is attached, and a film. It has substantially the same thickness as the width in the direction orthogonal to the longitudinal direction of the sticking region 10a of the substrate 10, and is made of a soft non-metal material such as a foamable acrylic resin. The spacer 20 is attached to the attachment region 10b by the adhesive layer 30a so that one side thereof overlaps the folded portion 15a and the side facing the spacer 20 overlaps the connection side of the attachment region 10b with the attachment region 10c. An adhesive layer 30b is laminated on the surface of the spacer 20 opposite to the attachment surface with the attachment region 10b by applying an adhesive to the entire surface thereof.

The sticking region 10c is connected to the side of the sticking region 10b facing the folded portion 15a via the folded portion 15b so as to extend in the direction opposite to the sticking region 10a. A second region in the present invention is formed from the sticking region 10b and the sticking region 10c.

The sticking region 10d is a third region in the present invention, and the folding portion 15c is provided on the side of the sticking region 10c facing the folded portion 15b so as to extend in the direction opposite to the sticking region 10b. It is connected through.

The folded portions 15a to 15c and 16a to 16d may be provided with perforations, streaks, or the like so that the film substrate 10 can be easily bent.

Hereinafter, a method of using the looseness detection label 1 configured as described above and an operation at that time will be described.

2A and 2B are views showing an example of an adherend to which the looseness detection label 1 shown in FIG. 1 is attached. FIG. 2A is a top view, and FIG. 2B is viewed from the direction of arrow A shown in FIG. It is a side view.

As shown in FIG. 2, the looseness detection label 1 shown in FIG. 1 includes, for example, a metal base 3 as a tightening target component and a metal bolt 2 as a tightening member to be tightened to the base 3. It is used by being attached to an adherend. In this adherend, a bolt 2 composed of a regular hexagonal head portion 2a and a screw portion 2b extending from one surface of the head portion 2a is provided, and a screw portion 2b is provided in a screw hole 3a formed in the base 3. By being screwed in, the bolt 2 is tightened to the base 3. At that time, the bolt 2 may loosen due to vibration or the like applied from the outside, and the looseness detection label 1 shown in FIG. 1 is used to detect the looseness.

3A and 3B are views showing an example of a state in which the looseness detection label 1 shown in FIG. 1 is attached to the adherend shown in FIG. 2, where FIG. 3A is a top view and FIG. 3B is FIG. It is a side view seen from the A direction shown in.

When the looseness detection label 1 shown in FIG. 1 is attached to the adherend shown in FIG. 2 and used for loosening detection of the bolt 2, the spacer 20 is attached to the head portion 2a of the bolt 2 as shown in FIG. The sticking area 10a of the film substrate 10 is wound around the side surface of the spacer 20 and stuck by the adhesive layer 30a so as to overlap the upper surface of the film substrate 10, and further, the sticking area 10c of the film substrate 10 is attached. Is attached to the side surface of the spacer 20 and the side surface of the head portion 2a of the bolt 2 by the adhesive layer 30a, and the attachment area 10d of the film substrate 10 is attached to the surface of the base 3 by the adhesive layer 30a. .. At that time, since each of the five regions divided by the folded portions 16a to 16d of the attachment region 10a corresponds to each of the five side surfaces of the regular hexagonal side surface of the head portion 2a of the bolt 2. The length of the sticking area 10a in the longitudinal direction is such that when the looseness detection label 1 is stuck across the bolt 2 and the base 3 as described above, the sticking area 10a does not overlap with the sticking area 10c. It has become. By winding the sticking region 10a of the film substrate 10 around the side surface of the spacer 20 and sticking the film substrate 10 in this way, the sticking region 10a is stuck along the side surface of the spacer 20, but the spacer 20 is attached. By attaching the bolt 2 so as to overlap the upper surface of the head portion 2a and wrapping the attachment area 10a of the film substrate 10 around the side surface of the spacer 20 to attach the film substrate 10, the attachment area 10a of the film substrate 10 is formed. It is in a state of being attached along the side surface of the head portion 2a of the bolt 2. Further, by attaching the spacer 20 to which the attachment region 10b is attached to the upper surface of the head portion 2a of the bolt 2, the attachment region 10b faces the upper surface of the head portion 2a of the bolt 2 and the attachment region is attached. 10c faces the side surface of the head portion 2a of the bolt 2. As a result, the attachment regions 10b and 10c, which are the second regions, are attached so as to face each other from the upper surface to the side surface of the head portion 2a of the bolt 2. In this embodiment, the spacer 20 having a regular hexagonal shape substantially the same as the shape of the upper surface of the head portion 2a of the bolt 2 has been described as an example, but the upper surface of the head portion 2a of the bolt 2 has been described as an example. It may be larger or smaller in size.

In the looseness detection label 1 attached across the bolt 2 and the base 3 in this way, the looseness detection wiring 13 is formed in a loop shape to be in a conductive state. Then, the looseness detection label 1 is attached across the bolt 2 and the base 3 as described above, whereby a looseness detection structure for detecting the looseness of the bolt 2 with respect to the base 3 is formed.

FIG. 4 is for explaining the action when the bolt 2 is loosened in a state where the looseness detection label 1 shown in FIG. 1 is attached straddling the bolt 2 and the base 3 as shown in FIG. (A) is a top view, and (b) is a side view seen from the A direction shown in (a).

In a state where the looseness detection label 1 shown in FIG. 1 is attached straddling the bolt 2 and the base 3 as shown in FIG. 3, the bolt 2 is as shown in FIG. 4A due to vibration or the like applied from the outside. When the base 3 is rotated counterclockwise and loosened with respect to the base 3, as shown in FIG. 4B, the sticking area 10c stuck to the side surface of the spacer 20 and the side surface of the head portion 2a of the bolt 2. And the attachment area 10d attached to the base 3 are distorted.

FIG. 5 shows the looseness detection label 1 shown in FIG. 1 attached to the attachment area 10c and the base 3 attached to the side surface of the spacer 20 and the side surface of the head portion 2a of the bolt 2 as shown in FIG. It is a figure for demonstrating the action when the distortion occurs with the sticking area 10d.

As described above, when distortion occurs between the attachment area 10c attached to the side surface of the spacer 20 and the side surface of the head portion 2a of the bolt 2 and the attachment area 10d attached to the base 3. As shown in FIG. 5, the looseness detection label 1 is broken due to the distortion, and the looseness detection wiring 13 is disconnected accordingly, resulting in a non-conducting state. Then, by detecting the non-conducting state of the looseness detection wiring 13, it is detected that the bolt 2 tightened to the base 3 has loosened.

In this way, when the bolt 2 tightened to the base 3 is not loosened, the looseness detection wiring 13 is in a conductive state, while the bolt 2 tightened to the base 3 is loosened. Since the looseness detection wiring 13 is in a non-conducting state, it is possible to detect that the bolt 2 is loosened by detecting the looseness detecting wiring 13 in a conductive state. At that time, by detecting that the bolt 2 is loose, the looseness detection label 1 is broken when the bolt 2 tightened to the base 3 is loosened, so that the base 3 can be loosened. Even if the tightened bolt 2 is loose, the looseness can be detected.

Hereinafter, a specific method for detecting looseness of the bolt 2 with respect to the base 3 by utilizing the above-mentioned action will be described.

FIG. 6 is a diagram showing an example of a system for detecting looseness of the bolt 2 with respect to the base 3 using the looseness detection label 1 shown in FIG.

As a system for detecting looseness of the bolt 2 with respect to the base 3 using the looseness detection label 1 shown in FIG. 1, as shown in FIG. 6, a reading means capable of non-contact communication with the looseness detection label 1 is possible. A system having a reader / writer 5 and a management personal computer 6 as a processing means connected to the reader / writer 5 via a wire or wireless can be considered. It is also conceivable to use a handy terminal having a built-in processing means as well as a reading means as a reader / writer, in which case a management personal computer becomes unnecessary.

FIG. 7 is a flowchart for explaining a method of detecting looseness of the bolt 2 with respect to the base 3 by using the looseness detection label 1 shown in FIG. 1 in the system shown in FIG.

In the looseness detection label 1 shown in FIG. 1, when the reader / writer 5 is close to the looseness detection label 1 and the looseness detection label 1 is detected by the reader / writer 5 (step 1), first, the reader / writer 5 starts from Power is supplied to the looseness detection label 1, and an instruction to detect the continuity state of the looseness detection wiring 13 and transmit the detection result is transmitted to the looseness detection label 1 (step 2). At this time, in the looseness detection label 1, the attachment region 10a on which the antenna 13 is formed is not directly attached to the bolt 2 or the base 3, but is wound around the side surface of the spacer 20, and the spacer 20 is used. Since it is attached to the upper surface of the head portion 2a of the bolt 2, even if the looseness detection label 1 is attached to the metal bolt 2, the looseness detection label 5 is used by the reader / writer 5 without being significantly affected by the metal. Non-contact communication with 1 can be performed.

When the power supplied from the reader / writer 5 is obtained by the loosening detection label 1 and the command transmitted from the reader / writer 5 is received by the IC chip 11 via the antenna 12 of the loosening detection label 1 (step 3). ), A current is supplied to the looseness detection wiring 13 by the electric power supplied from the reader / writer 5.

In the IC chip 11, the resistance value of the looseness detection wiring 13 is detected by using the supplied current, so that the conduction state of the looseness detection wiring 13 is detected (step 4). Here, when the looseness detection label 1 is attached to the bolt 2 and the bolt 2 is not loosened as shown in FIG. 3, the looseness detection wiring 13 is in a conductive state, so that the IC chip 11 is in a conductive state. The resistance value of the looseness detection wiring 13 itself will be detected.

In the IC chip 11, when the detected resistance value is the resistance value of the looseness detection wiring 13 itself, it is determined that the looseness detection wiring 13 is in a conductive state, and the determination result is that of the looseness detection wiring 13. As a result of detecting the conduction state, it is converted into digital information and transmitted non-contactly to the reader / writer 5 via the antenna 12 (step 5). Since the resistance value detected by the IC chip 11 when the looseness detection wiring 13 is in the non-conducting state becomes almost infinite as described later, the looseness detection wiring in the IC chip 11 As the resistance value for determining that the 13 is in the conductive state, a resistance value of a certain threshold value or less may be used instead of the resistance value of the looseness detection wiring 13 itself.

On the other hand, the looseness detection label 1 is attached to the bolt 2, and the bolt 2 is loosened as shown in FIG. 4, so that the looseness detection label 1 is broken and the looseness detection wiring 13 is formed as shown in FIG. If the wire is broken, the looseness detection wiring 13 is in a non-conducting state. In that state, even if a current is supplied to the looseness detection wiring 13 by the electric power supplied from the reader / writer 5, the looseness detection wiring 13 is in a non-conducting state, so that the looseness detection wiring 13 has a current. Does not flow, so that the resistance value detected by the IC chip 11 becomes almost infinite.

In the IC chip 11, when the detected resistance value is almost infinite, it is determined that the looseness detection wiring 13 is in a non-conducting state, and the determination result is that the looseness detection wiring 13 is in a conductive state. As a detection result, it is converted into digital information and transmitted non-contactly to the reader / writer 5 via the antenna 12. Since the resistance value detected by the IC chip 11 becomes almost infinite when the looseness detection wiring 13 is in the non-conducting state, the looseness detecting wiring 13 is in the non-conducting state in the IC chip 11. The resistance value for determining the above is not almost infinite, and a wiring having a certain threshold value or more larger than the resistance value of the looseness detection wiring 13 itself may be used.

In this way, in the reader / writer 5, the conduction state of the looseness detection wiring 13 detected by the looseness detection label 1 is non-contact transmitted via the antenna 12.

When the detection result transmitted non-contactly from the looseness detection label 1 to the reader / writer 5 as described above is received by the reader / writer 5 (step 6), the detection result received by the reader / writer 5 is the management personal computer. Transferred to 6 (step 7).

When the detection result transferred from the reader / writer 5 is received by the management personal computer 6 (step 8), the looseness detection label 1 is non-contactly transmitted to the reader / writer 5 in the management personal computer 6, and the management personal computer 6 Based on the detection result transferred to, it is determined whether or not the bolt 2 is loose (step 9). Specifically, in the detection result transferred from the reader / writer 5 to the management personal computer 6, if the looseness detection wiring 13 is in a conductive state, it is determined that the bolt 2 is not loosened, and the looseness detection wiring. When 13 is in a non-conducting state, it is determined that the bolt 2 is loose.

The looseness detection label 1 configured in this way can be used for detecting looseness of bolts fixing the bogie, for example, in a bogie of a railroad vehicle. In that case, if the spacer 20 is made of a soft material such as foamable acrylic resin, looseness detection is detected even if the looseness detection label 1 is blown by the wind or falls off due to vibration while the railroad vehicle is running. The damage caused by the label 1 hitting the human body or the like can be reduced.

Here, the effect of the fact that the sticking region 10a of the film substrate 10 constituting the loosening detection label 1 has a band shape and the antenna 12 is formed extending along the longitudinal direction of the sticking region 10a will be described. ..

First, the communication distance when the label formed in the region where the antenna 12 faces the upper surface of the head portion 2a of the bolt 2 is attached across the bolt 2 and the base 3 in the same manner as described above was measured. The communication distance was measured using a BHT series manufactured by Denso Wave Co., Ltd. as a reader / writer with an output of 0.1 W.

In that case, the communication distance was 10 cm when the looseness detection wiring 13 was not broken, and the communication distance was 5 cm when the looseness detection wiring 13 was broken.

On the other hand, as shown in FIG. 3, the loosening detection label 1 shown in FIG. 1 is wrapped around the side surface of the spacer 20 and the spacer 20 is attached to the upper surface of the head portion 2a of the bolt 2. As a result, the communication distance when the sticking area 10a was stuck along the side surface of the head portion 2a of the bolt 2 was measured. As a result, when the looseness detection wiring 13 was not broken, the communication distance was measured. Was 17 cm, and the communication distance was 8 cm when the looseness detection wiring 13 was broken.

As described above, in order to extend the communication distance, it is conceivable to increase the length of the communication antenna. However, when the antenna 12 is formed in the region facing the upper surface of the head portion 2a of the bolt 2, the bolt Even if the antenna is formed in the region having the maximum diameter of the head portion 2a of 2, the length thereof can be increased only up to the maximum diameter of the head portion 2a of the bolt 2.

On the other hand, in the looseness detection label 1 of the present embodiment, the spacer 20 is wound around the side surface of the spacer 20 and is attached to the upper surface of the head portion 2a of the bolt 2 so as to follow the side surface of the head portion 2a of the bolt 2. By having the strip-shaped sticking region 10a stuck as described above, if the antenna 12 is formed so as to extend along the longitudinal direction of the strip, the length of the antenna 12 is the maximum of the head portion 2a of the bolt 2. The diameter can be exceeded, whereby the communication distance can be increased as described above.

Further, in a configuration in which the metal bolt 2 and the base 3 are attached across the metal bolt 2 and the base 3 as in the present embodiment, when the spacer 20 is attached to the upper surface of the head portion 2a of the bolt 2, it is attached to the side surface of the spacer 20. By forming the antenna 12 in the attachment region 10a to be attached, the antenna 12 and the bolt 2 are electrically coupled to each other, and there is a possibility that the communication distance is further improved. In that case, assuming that the thickness of the spacer 20 is 50 mm, the width of the antenna 12 is preferably about 10 mm to 40 mm, more preferably about 30 mm to 40 mm.

As described above, in the present embodiment, the antenna 12 for non-contact transmission of the conduction state of the looseness detection wiring 13 is formed so as to extend in the longitudinal direction of the band-shaped attachment region 10a, and thus the looseness detection label. When 1 is attached straddling the bolt 2 and the base 3, the antenna 12 has a shape along the side surface of the head portion 2a of the bolt 2, so that even if the bolt 2 is small. , The length of the antenna 12 can be increased, and it becomes easy to obtain a sufficient communication distance. Further, the non-metal spacer 20 is attached to the attachment area 10b to be attached to the head portion 2a of the bolt 2, and the antenna 20 is arranged along the side surface of the spacer 20 to make the bolt 2 conductive. Even if it is made of a material, it is possible to avoid shortening the communication distance.

(Second Embodiment)
8A and 8B are views showing a second embodiment of the looseness detection label of the present invention, in which FIG. 8A is a top view and FIG. 8B is a side view seen from the direction A shown in FIG. 8A.

As shown in FIG. 8, the loosening detection label 101 is different from the loosening detection label 1 shown in FIG. 1 in that it does not have the spacer 20 and the adhesive layer 30b.

9 is a view showing an example of a state in which the looseness detection label 101 shown in FIG. 8 is attached to an adherend having the same shape as the adherend shown in FIG. 2, and FIG. 9A is a top view. , (B) are side views seen from the direction A shown in (a).

Since the looseness detection label 101 shown in FIG. 8 does not have the spacer 20 of the looseness detection label 1 shown in FIG. 1, the adherend to be attached is shown in FIG. It is conceivable that a non-metal bolt 102 is used instead of the metal bolt 2 shown in 2. When the looseness detection label 101 shown in FIG. 8 is used for looseness detection of the bolt 102 in such an adherend, as shown in FIG. 9, the sticking area 110b of the film substrate 110 is used as the head of the bolt 102. The adhesive layer 30a is attached to the upper surface of the portion 102a, and the attachment region 110a of the film substrate 110 is wound around the side surface of the head portion 102a of the bolt 102 and attached by the adhesive layer 30a, and further, the film substrate 110 is attached. The region 110c is attached to the side surface of the head portion 102a of the bolt 102 by the adhesive layer 30a, and the attachment region 110d of the film substrate 110 is attached to the surface of the base 3 by the adhesive layer 30a. At that time, since each of the five regions divided by the folded portions 16a to 16d of the sticking region 110a corresponds to each of the five side surfaces of the regular hexagonal side surface of the head portion 102a of the bolt 102. The length of the sticking area 110a in the longitudinal direction is such that when the looseness detection label 101 is stuck across the bolt 102 and the base 3 as described above, the sticking area 110a does not overlap with the sticking area 110c. It has become. In this way, the attachment region 110a of the film substrate 110 is wound around the side surface of the head portion 102a of the bolt 102 and attached, so that the attachment region 110a of the film substrate 110 is attached to the side surface of the head portion 102a of the bolt 102. It will be in a state of being pasted along the line.

In the looseness detection label 101 attached across the bolt 102 and the base 3 in this way, the looseness detection wiring 13 is formed in a loop shape to be in a conductive state. Then, the looseness detection label 101 is attached across the bolt 102 and the base 3 as described above to form a looseness detection structure for detecting looseness of the bolt 102 with respect to the base 3.

FIG. 10 is for explaining the action when the bolt 102 is loosened in a state where the looseness detection label 101 shown in FIG. 8 is attached straddling the bolt 102 and the base 3 as shown in FIG. (A) is a top view, and (b) is a side view seen from the A direction shown in (a).

In a state where the looseness detection label 101 shown in FIG. 8 is attached straddling the bolt 102 and the base 3 as shown in FIG. 9, the bolt 102 is as shown in FIG. 10A due to vibration or the like applied from the outside. When the bolt 102 is rotated counterclockwise to loosen the base 3, the bolt 102 is attached to the attachment area 110c attached to the side surface of the head portion 2a and the base 3 as shown in FIG. 10 (b). Distortion occurs between the attached region 110d and the attached region 110d.

Then, similarly to the one shown in FIG. 1, the looseness detection label 101 is broken due to the distortion, and the looseness detection wiring 13 is disconnected accordingly to be in a non-conducting state. Then, by detecting the non-conducting state of the looseness detection wiring 13, it is detected that the bolt 102 tightened to the base 3 has loosened.

In this way, when the bolt 102 tightened to the base 3 is not loosened, the looseness detection wiring 13 is in a conductive state, while the bolt 102 tightened to the base 3 is loosened. Since the looseness detection wiring 13 is in a non-conducting state, it is possible to detect that the bolt 102 is loosened by detecting the looseness detecting wiring 13 in a conductive state. At that time, by detecting that the bolt 102 is loose, the looseness detection label 101 is broken when the bolt 102 tightened to the base 3 is loosened, so that the base 3 can be loosened. Even if the tightened bolt 102 has a small looseness, the looseness can be detected.

(Third Embodiment)
11A and 11B are views showing a third embodiment of the looseness detection label of the present invention, in which FIG. 11A is a top view and FIG. 11B is a side view seen from the direction A shown in FIG. 11A.

As shown in FIG. 11, the present embodiment differs from the looseness detection label 1 shown in FIG. 1 in that the first region is divided into two attachment regions 210a-1,210a-2. Label 201.

The two attachment regions 210a-1,210a-2 each have a band shape and are connected to the attachment region 10b via the folded portions 215a-1,215a-2. Antennas 212-1,212-2 extending in the longitudinal direction thereof are formed in the attachment regions 210a-1,210a-2, respectively, and these antennas 212-1,212-2 pass through the loop portion 14. Are connected to each other. Further, the attachment regions 210a-1,210a-2 are provided with folding portions 16a to 16d in the same manner as those shown in FIG.

Similarly to the looseness detection label 201 configured as described above, when the looseness detection label 201 is attached to the adherend shown in FIG. 2 and used for looseness detection of the bolt 2, the spacer 20 is used. Is attached by the adhesive layer 30b so as to overlap the upper surface of the head portion 2a of the bolt 2, and the attachment areas 210a-1,210a-2 of the film substrate 210 are wound around the side surfaces of the spacer 20, respectively, by the adhesive layer 30a. The film substrate 210 is attached, and the attachment area 10c of the film substrate 210 is attached by the adhesive layer 30a over the side surface of the spacer 20 and the side surface of the head portion 2a of the bolt 2, and the attachment area 10d of the film substrate 210 is attached. Will be attached to the surface of the base 3 by the adhesive layer 30a.

Also in the looseness detection label 201 of this embodiment, the antennas 212-1,212-2 for non-contact transmission of the conduction state of the looseness detection wiring 13 are provided in the longitudinal direction of the strip-shaped attachment regions 210a-1,210a-2. When the looseness detection label 201 is attached across the bolt 2 and the base 3 shown in FIG. 2, the antennas 212-1,122-2 are attached to the head portion of the bolt 2. It has a shape that follows the side surface of 2a, so that the length of the antennas 212-1,122-2 can be increased even when the bolt 2 is small, and a sufficient communication distance can be obtained. It will be easier.

(Fourth Embodiment)
12A and 12B are views showing a fourth embodiment of the looseness detection label of the present invention, in which FIG. 12A is a top view and FIG. 12B is a side view seen from the direction A shown in FIG. 12A.

In this embodiment, as shown in FIG. 12, the first region is divided into two attachment regions 310a-1 and 310a-2 with respect to the looseness detection label 1 shown in FIG. 1, and each of them is attached. The looseness detection label 301 is different in that it is connected to different sides of the region 310b.

The two attachment regions 310a-1 and 310a-2 each have a strip shape, and are connected to different sides of the attachment region 310b via the folded portions 315a-1 and 315a-2. Antennas 312-1, 312-2 extending in the longitudinal direction thereof are formed in the attachment regions 310a-1 and 310a-2, respectively, and these antennas 312-1, 312-2 pass through the loop portion 314. Are connected to each other. Further, the attachment regions 310a-1 and 310a-2 are provided with folded portions 16a and 16d in regions facing the corners of the side surface of the spacer 20 when the spacer 20 is attached to the side surface.

Similarly to the looseness detection label 301 configured as described above, when the looseness detection label 301 is attached to the adherend shown in FIG. 2 and used for looseness detection of the bolt 2, the spacer 20 is used. Is attached by the adhesive layer 30b so as to overlap the upper surface of the head portion 2a of the bolt 2, and the attachment areas 310a-1 and 310a-2 of the film substrate 310 are wound around the side surfaces of the spacer 20, respectively, by the adhesive layer 30a. The film substrate 310 is attached, and the attachment area 10c of the film substrate 310 is attached by the adhesive layer 30a over the side surface of the spacer 20 and the side surface of the head portion 2a of the bolt 2, and the attachment area 10d of the film substrate 310 is attached. Will be attached to the surface of the base 3 by the adhesive layer 30a.

Also in the looseness detection label 301 of this embodiment, the antennas 312-1, 312-2 for non-contact transmission of the conduction state of the looseness detection wiring 13 are in the longitudinal direction of the band-shaped attachment regions 310a-1, 310a-2. When the looseness detection label 301 is attached across the bolt 2 and the base 3 shown in FIG. 2, the antennas 312-1, 312-2 are attached to the head portion of the bolt 2. It has a shape that follows the side surface of 2a, so that the length of the antennas 312-1, 312-2 can be increased even when the bolt 2 is small, and a sufficient communication distance can be obtained. It will be easier.

(Fifth Embodiment)
13A and 13B are views showing a fifth embodiment of the looseness detection label of the present invention, in which FIG. 13A is a top view and FIG. 13B is a side view seen from the direction A shown in FIG.

As shown in FIG. 13, this embodiment has a regular hexagonal shape in which the sticking area 410b is the same as the shape of the upper surface of the bolt 2 (see FIG. 2) to be stuck to the looseness detection label 1 shown in FIG. The looseness detection label 401 is different in that it has a shape and is formed as two antennas 412 in the sticking area 410b in addition to the antenna 12 formed in the sticking area 10a as a communication antenna.

Each of the two antennas 412 formed in the sticking area 410b is formed in an arc shape from the connection point between the loop portion 14 and the antenna 12 along one end side of the sticking area 410b.

In the looseness detection label 401 configured as described above, similarly to the one shown in FIG. 1, when the looseness detection label 401 is attached to the adherend shown in FIG. 2 and used for looseness detection of the bolt 2, it is attached. The area 410b and the spacer 20 are attached by the adhesive layer 30b so as to overlap the upper surface of the head portion 2a of the bolt 2, and the application area 10a of the film substrate 410 is wound around the side surface of the spacer 20 and attached by the adhesive layer 30a. Further, the attachment region 10c of the film substrate 410 is attached by the adhesive layer 30a over the side surface of the spacer 20 and the side surface of the head portion 2a of the bolt 2, and the attachment area 10d of the film substrate 410 is attached. The adhesive layer 30a is attached to the surface of the base 3.

Also in the looseness detection label 401 of this embodiment, the antenna 12 for non-contact transmission of the conduction state of the looseness detection wiring 13 is formed so as to extend in the longitudinal direction of the band-shaped attachment region 10a, and the looseness detection label When the 401 is attached across the bolt 2 and the base 3 shown in FIG. 2, the antenna 12 has a shape along the side surface of the head portion 2a of the bolt 2, whereby the bolt 2 is formed. Even if it is small, the length of the antenna 12 can be increased, and it becomes easy to obtain a sufficient communication distance. Further, in the looseness detection label 401 of the present embodiment, the communication distance can be extended by forming the antenna 412 not only in the sticking area 10a of the film substrate 410 but also in the sticking area 410b.

In the looseness detection label 401 of the present embodiment, the sticking area 410b has a regular hexagonal shape that is the same as the shape of the upper surface of the bolt 2 (see FIG. 2) to be stuck, but the sticking area 410b. The shape of the above is not limited to this, and any shape may be used as long as it does not protrude from the upper surface of the bolt 2 to be attached (see FIG. 2).

The looseness detection label 401 of the present embodiment has the spacer 20 attached to the surface of the attachment area 410b opposite to the surface on which the looseness detection wiring 13 is formed, similar to that shown in FIG. However, similar to the one shown in FIG. 8, it is conceivable that the spacer 20 is not provided. In that case, it is conceivable that the bolt is attached to a non-metal bolt in the same manner as that shown in FIG. Further, the looseness detection label 401 of the present embodiment has a configuration that does not have the spacer 20 because the attachment region 410b has a regular hexagonal shape that is the same as the shape of the upper surface of the bolt to be attached, as described above. Even so, the alignment between the sticking area 410b and the bolt becomes easy. Further, if the attachment region 410b does not have a regular hexagonal shape that is the same as the shape of the upper surface of the bolt to be attached, but has a 120 ° corner portion that is one corner of the regular hexagon, it is sufficient. By superimposing the corner portion on one corner portion on the upper surface of the bolt to be attached and attaching the corner portion, the alignment between the attachment area 410b and the bolt becomes easy.

Further, in the present embodiment, the two antennas 412 formed in the attachment region 410b to be attached so as to overlap the upper surface of the head portion 2a of the bolt 2 have been described by taking an arc-shaped antenna as an example. The shape is not limited to the arc shape.

Further, in the above-described embodiment, the antennas 12, 212-1,122-2, 312-1,312-2 are attached to the attachment regions 10a, 110a, 210a-1,210a-2, 310a-1,310a. -2 is formed from one end to the other end in the longitudinal direction, and when attached to the bolt 2, it is configured to face two or more side surfaces of the head portion 2a of the bolt 2. As the communication antenna formed in the sticking region of the above, if it is formed so as to extend in the longitudinal direction of the first sticking region, the head portion 2a of the bolt 2 is 1 when the antenna is stuck to the bolt 2. It may be configured to face only one side surface. In such a configuration, as shown in FIG. 13, in the sticking region 410b, an arc shape is formed along one end side of the sticking region 410b from the connection point between the loop portion 14 and the antenna 12. If the configuration has two antennas 412 formed in the above, it becomes easy to secure a sufficient communication distance.

1,101,201,301,401 Loosening detection label 2,102 Bolt 2a, 102a Head part 2b, 102b Thread part 3 Base 3a Screw hole 5 Reader / writer 6 Management personal computer 10,110,210,310,410 Film substrate 10a 10d, 110a to 110d, 210a-1,210a-2, 310a-1, 310a-2,410b Attachment area 11 IC chip 12,212-1,122-2,312-1,312-2,412 Antenna 13 Loosening detection wiring 14,314 Loop part 15a to 15c, 16a to 16d, 215a-1,215a-2, 315a-1,315a-2 Folded part 20 Spacer 30a, 30b Adhesive layer

Claims (4)

A looseness detection label that detects looseness of the tightening member tightened to the part to be tightened via non-contact communication.
An adhesive layer is laminated on one surface, and the band-shaped first region to be attached along the side surface of the tightening member and the first region extending in a direction orthogonal to the longitudinal direction of the first region. A second region connected to the first region and adhered so as to face the tightening member from the upper surface to the side surface thereof and the second region connected to the opposite side of the first region. Then, a base base material provided with a third region to be attached to the tightening target part, and
A communication antenna formed in the first region of the base base material so as to extend in the longitudinal direction of the first region.
Looseness detection wiring formed across the second region and the third region of the base base material, and
It is arranged in the second region of the sheet base material in connection with the communication antenna and the looseness detection wiring, detects the conduction state of the looseness detection wiring, and reports the detection result via the communication antenna. It has a detection means for non-contact transmission,
The first region is a looseness detection label having a length that does not overlap with the second region when the looseness detection label is attached across the tightening member and the tightening target component. In the looseness detection label according to claim 1,
It has an outer shape substantially the same as the shape of the upper surface of the tightening member, and has a non-conductive member attached to a part of the second region of the base base material by the adhesive layer.
A loosening detection label in which the width in the direction orthogonal to the longitudinal direction of the first region is substantially the same as the thickness of the non-conductive member. In the loosening detection label according to claim 1 or 2.
The communication antenna is a looseness detection label that is also formed in the second region. Parts to be tightened and
The tightening member tightened to the tightening target part and
A non-conductive member having an outer shape substantially the same as the shape of the upper surface of the tightening member and attached to the upper surface of the tightening member.
An adhesive layer is laminated on one surface, and the band-shaped first region wound around the side surface of the non-conductive member and attached by the adhesive layer and the direction orthogonal to the longitudinal direction of the first region. A second region that is connected to the first region so as to extend and is adhered by the adhesive layer from the upper surface to the side surface of the non-conductive member and further to the side surface of the tightening member, and the second region. A base base material which is connected to the side of the region opposite to the first region and includes a third region which is attached to the tightening target component by the adhesive layer.
A communication antenna formed in the first region of the base base material so as to extend in the longitudinal direction of the first region.
Looseness detection wiring formed across the second region and the third region of the base base material, and
It is arranged in the second region of the sheet base material in connection with the communication antenna and the looseness detection wiring, detects the conduction state of the looseness detection wiring, and reports the detection result via the communication antenna. It has a detection means for non-contact transmission,
The first region has a length that does not overlap with the second region attached to the side surface of the non-conductive member and the tightening member in a state of being wound and attached to the side surface of the non-conductive member. Looseness detection structure with dimensions.

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