Detection device

Abstract

To detect a theft of a material even in water immersion and at night.SOLUTION: A detection device includes: a cable arranged in a material and / or a container for storing the material; and a detection section connected to the cable. The detection section detects pulling force to be actuated on the cable. The detection section may be a limit switch. The limit switch has a switch having at least one magnet. The switch is connected to the cable. The switch may be turned on or off in response to a contact / noncontact state of the magnet.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present technology relates to detection devices for detecting theft of materials. [Background technology]

[0002] Conventionally, devices for detecting theft of materials have been installed at power plants, construction sites, etc. These devices often have a mechanism for detecting unauthorized removal or cutting by attaching sensors inside containers that hold materials such as electric wires.

[0003] For example, Patent Document 1 discloses a technology relating to "a resin container for accommodating a cable, the resin container comprising a container body having an opening that opens upward, a lid that covers the opening, and a mechanism for detecting changes from the initial installation state of the resin container by optical or electrical means." [Prior art documents] [Patent documents]

[0004] [Patent Document 1] International Publication No. 2021 / 100870 Summary of the Invention [Problem to be solved by the invention]

[0005] However, for example, if the materials and sensors are stored in a container, the sensor may fail if the container becomes flooded due to rain or other factors, and the theft may not be detected. Also, if an electric wire, which is an example of materials, is connected to a solar power plant at night, no power is generated, so no current flows through the wire and it may not be possible to detect the breakage of the wire.

[0006] Therefore, the main objective of this technology is to provide a technology that can detect theft of materials even during flooding or at night. [Means for solving the problem]

[0007] This technology is a cable disposed on the material or a container containing the material, or both; a detector connected to the cable, The detection device is configured to detect a tensile force acting on the cable. The detection unit may be a limit switch. The limit switch is a switch having at least one magnet; the switch is connected to the cable; The switch may be in an on or off state depending on whether the magnet is in contact or not. The cable may be disposed on a lid of a container in which the material is stored. A connection portion that connects the cable and the lid may be disposed near the side where the lid opens. A support is provided on the container, The cable may be connected to the detection portion via the support portion. The detection unit may be disposed outside the container. The tension sensor may further include a notification section connected to the detection section and configured to notify an external device that the tension force has been detected. The device may further include a threat section connected to the detection section for threatening a person exerting the pulling force. The material may be connected to a solar power plant. Effect of the Invention

[0008] According to the present technology, it is possible to provide a technology that can detect the theft of materials even during flooding or at night. Note that the effects described in this specification are merely examples and are not limiting, and other effects may also be provided. [Brief description of the drawings]

[0009] [Figure 1]1 is a schematic diagram showing a configuration example of a detection device 10 according to an embodiment of the present technology. [Diagram 2] 1 is a schematic diagram showing a comparative example of the detection device 10 according to an embodiment of the present technology. [Diagram 3] 1 is a schematic perspective view showing a configuration example of a connection portion 25 according to an embodiment of the present technology. [Figure 4] 1 is a schematic perspective view showing a configuration example of a detection device 10 according to an embodiment of the present technology. [Diagram 5] 1 is a schematic diagram showing a configuration example of a detection device 10 according to an embodiment of the present technology. [Figure 6] 1 is a schematic diagram showing a configuration example of a detection device 10 according to an embodiment of the present technology. [Figure 7] 2 is a schematic diagram showing a configuration example of a detection unit 12 according to an embodiment of the present technology. FIG. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0010] Hereinafter, preferred embodiments for carrying out the present technology will be described with reference to the drawings. The embodiments described below are representative examples of the present technology, and any of the embodiments can be combined. In addition, the scope of the present technology is not narrowly interpreted by these.

[0011] In the following description of the embodiments, the configuration may be described using terms with "approximately" such as "approximately parallel" and "approximately perpendicular". For example, "approximately parallel" does not only mean completely parallel, but also means substantially parallel, that is, including a state in which the state is shifted from a completely parallel state by, for example, 30% or less, preferably 20% or less, and more preferably 10% or less. The same applies to other terms with "approximately". In addition, each figure is a schematic diagram and is not necessarily illustrated precisely. The scale of the drawings is emphasized to make the characteristics of the technology easier to understand. Therefore, it should be noted that the scale of the drawings and the scale of the actual device are not necessarily the same.

[0012] Unless otherwise specified, in the drawings, "top" means the top direction or upper side in the drawing, "bottom" means the bottom direction or lower side in the drawing, "left" means the left direction or left side in the drawing, and "right" means the right direction or right side in the drawing. In addition, in the drawings, the same or equivalent elements or members are given the same reference numerals, and duplicate explanations are omitted.

[0013] [1. First embodiment of the present technology (detection device example 1)] The present technology provides a detection device comprising a cable placed on a material or a container containing the material, or both, and a detection unit connected to the cable, wherein the detection unit detects a tensile force acting on the cable.

[0014] A configuration example of a detection device according to an embodiment of the present technology will be described with reference to Fig. 1. Fig. 1 is a schematic diagram showing a configuration example of a detection device 10 according to an embodiment of the present technology.

[0015] Fig. 1A is a side view of the detection device 10 when viewed from a direction horizontal to the ground. Fig. 1A shows the state of the detection device 10 under normal circumstances.

[0016] 1A, a cable 11 is disposed in a container 21 extending in the left-right direction. The cable 11 may be, for example, a wire, a rope, a belt, or the like.

[0017] It is preferable that cable 11 has high rigidity so that a detection unit, which will be described later, can detect the tensile force acting on cable 11. The material of cable 11 is not particularly limited, but for example, stainless steel, titanium alloy, aluminum alloy, carbon fiber composite material, glass fiber composite material, etc. can be used. The diameter of cable 11 is not particularly limited, but when the material of cable 11 is stainless steel, the diameter is preferably about 1.5 mm.

[0018] For example, a twisted pair cable may be used as cable 11. When cable 11 is cut, the detection unit can detect the cut by detecting a signal flowing through the twisted pair cable.

[0019] Although not shown in the figure, materials are stored in the container 21. Examples of the materials include electric wires and optical cables.

[0020] There is no particular limitation on the material of the container 21. Metal materials are mainly used as examples of materials for the container 21. Other examples of materials that may be used include concrete materials, resin materials, and rubber materials.

[0021] In this configuration example, the cable 11 is disposed in the container 21, but the cable 11 may be disposed in the material. Alternatively, the cable 11 may be disposed in both the material and the container 21.

[0022] 1B and 1C show the state of the detection device 10 when an abnormality occurs. Fig. 1B is a side view of the detection device 10 when viewed from a direction horizontal to the ground. Fig. 1C is a plan view of the detection device 10 when viewed from a direction perpendicular to the ground.

[0023] As shown in FIG. 1C, the detection device 10 includes a detection unit 12 connected to a cable 11 .

[0024] The position where cable 11 is arranged is not particularly limited, but in this configuration example, cable 11 is arranged on lid 22 of container 21 in which materials are stored. When lid 22 is opened, cable 11 arranged on lid 22 is pulled. Therefore, detector 12 connected to cable 11 can detect the pulling force acting on cable 11. As a result, detector 10 can detect the theft of materials.

[0025] Although there is no particular limitation on the connection part 25 that connects the cable 11 and the lid body 22, it is preferable that the connection part 25 is disposed near the side where the lid body 22 opens. In this way, when the lid body 22 opens, a pulling force is immediately applied to the cable 11.

[0026] If the connection part 25 is disposed at a position far from the side where the lid body 22 opens (for example, approximately in the center of the lid body 22), a tensile stress is unlikely to act on the cable 11 even when the lid body 22 is opened, and there is a risk that it is not possible to detect that the lid body 22 has been opened. This will be described with reference to Fig. 2. Fig. 2 is a schematic diagram showing a comparative example of the detection device 10 according to an embodiment of the present technology.

[0027] 3, connection part 25 is disposed in a position away from the side where cover 22 opens (for example, approximately in the center of cover 22). As a result, when cover 22 is opened by sliding it in the left-right direction in the figure, tensile stress is unlikely to act on cable 11, and there is a risk that it will not be possible to detect that cover 22 has been opened.

[0028] It is preferable that the connection portion 25 is configured so that the cable 11 can slide. This will be described with reference to Fig. 3. Fig. 3 is a schematic perspective view showing a configuration example of the connection portion 25 according to an embodiment of the present technology.

[0029] 3, the connection part 25 is disposed on the back side of the lid body 22 (inside the container 21), and is configured so that the cable 11 can slide. Specifically, the cable 11 is inserted into an opening hole 251 of the connection part 25. The connection part 25 may be, for example, a saddle. Since the cable 11 is configured so as to be slidable, the detection function of the detection part 12 can be turned off and the lid body 22 can be opened under normal circumstances. The configuration of this connection part 25 may be the same in the third and fourth embodiments described later.

[0030] The detector 12 is preferably a limit switch. A limit switch is a device used to detect the limits of a physical position or operating range in a machine or system.

[0031] The limit switch includes a switch 121. The switch 121 is in contact with a machine or the like and detects the physical position of the machine, etc. In this embodiment, the switch 121 includes at least one magnet.

[0032] The switch 121 may be composed of, for example, a magnet and a metal plate to which the magnet can be attracted, or may be composed of, for example, a pair of magnets.

[0033] Then, switch 121 is connected to cable 11. When switch 121 is composed of a magnet and a metal plate, at least one of the magnet and the metal plate may be connected to cable 11. When switch 121 is composed of a pair of magnets, one of the magnets may be connected to cable 11.

[0034] Normally, the magnets of switch 121 are in contact with each other. When cable 11 is pulled, the metal plate or magnet connected to cable 11 is pulled and the magnet goes into a non-contact state. When switch 121 is composed of a magnet and a metal plate, the magnet and the metal plate go into a non-contact state. When switch 121 is composed of a pair of magnets, the pair of magnets go into a non-contact state.

[0035] In other words, the switch is turned on or off depending on whether the magnet is in contact or not, thereby allowing the detection unit 12 to detect the tensile force acting on the cable 11.

[0036] The detection unit 12 detects the pulling force acting on the cable 11 by a physical means, such as magnetic contact or non-contact, rather than an electrical means. Therefore, even if the container is flooded with water due to rain or the like, the detection unit 12 can detect the pulling force acting on the cable 11.

[0037] The assets are connected to a solar power plant. In the solar power plant, solar panels receive light from the sun and convert it into electricity. During the daytime, sunlight is abundant and the solar panels have the ability to generate electricity. This generated electricity is transmitted from the power plant through electric wires, which are examples of assets. If the electric wires are cut, the path of the current is interrupted and the supply of electricity from the power plant stops. Therefore, if a thief attempts to steal by cutting the electric wires, the solar power plant can detect the cut.

[0038] On the other hand, at night, when the sun sets and the solar panels are no longer exposed to direct light, the power plant stops generating electricity. Therefore, no electricity flows through the power lines, making it difficult to detect if they are cut.

[0039] According to this technology, theft is detected by physical means, either through magnetic contact or non-contact, so theft of materials can be detected even at night when electricity is cut off.

[0040] The detection device 10 may further include a notification unit 13. The notification unit 13 is connected to the detection unit 12, and can notify an external device that a pulling force has been detected. Examples of the notification unit 13 include an alarm panel, a telephone interlocking device (telephone dialer), a GSM module, and the like. This allows the notification unit 13 to notify a security company or the like that there is a possibility that the materials may be stolen.

[0041] The detection device 10 may further include an intimidating unit 14. The intimidating unit 14 is connected to the detection unit 12 and can intimidate a person who exerts a pulling force. Examples of the intimidating unit 14 include a police light, a flashlight, a motion sensor light, a siren, a video surveillance camera, and the like. This can intimidate thieves and prevent theft of materials.

[0042] The above description of the detection device according to the first embodiment of the present technology can be applied to other embodiments of the present technology unless there is any particular technical contradiction.

[0043] [2. Second embodiment of the present technology (detection device example 2)] A detection device according to another embodiment of the present technology will be described with reference to Fig. 4. Fig. 4 is a schematic perspective view showing a configuration example of a detection device 10 according to one embodiment of the present technology. The same components as those in the other embodiments described above are given the same reference numerals, and repeated description will be omitted.

[0044] Fig. 4A shows a state of the detection device 10 under normal circumstances. As shown in Fig. 4A, the cable 11 is disposed on the material 23. The material 23 is contained in a cylindrical container 21.

[0045] There is no particular limitation on the material of the container 21. For example, a fiber material can be used as the material of the container 21. In particular, it is preferable to use polyester canvas as the material of the container 21, which has excellent durability, weather resistance, breathability, flexibility, and the like.

[0046] The detection device 10 includes a detection unit 12 connected to a cable 11. The cable 11 is connected to the detection unit 12 through a pipe 24. This detection unit 12 is preferably disposed outside the container 21. Moreover, the detection unit 12 is preferably disposed at a position higher than the container 21. As a result, even if the inside of the container 21 is flooded with water, the detection unit 12 can detect the tensile force acting on the cable 11 without being affected by the flooding.

[0047] As described above, the detection unit 12 is preferably a limit switch. The limit switch 12 has a switch 121 having at least one magnet. The switch 121 is connected to the cable 11. Normally, the magnets are in contact with each other. At this time, the contacts in the switch 121 are closed, and the switch 121 is in an off state.

[0048] Fig. 4B shows the state of detection device 10 in an abnormal state. As shown in Fig. 4B, when container 21 containing materials 23 is opened, cable 11 is pulled. Then, switch 121 connected to cable 11 is pulled, and the magnet is put into a non-contact state. At this time, the contacts in switch 121 open, and switch 121 is turned on. With this mechanism, detection unit 12 can detect the pulling force acting on cable 11. As a result, detection device 10 can detect the theft of materials 23.

[0049] The detection device 10 may further include a notification unit 13. The notification unit 13 is connected to the detection unit 12 and can notify an external device that a pulling force has been detected.

[0050] The detection device 10 may further include an intimidating unit 14. The intimidating unit 14 is connected to the detection unit 12 and can intimidate a person who applies a pulling force.

[0051] The above description of the detection device according to the second embodiment of the present technology can be applied to other embodiments of the present technology unless there is any particular technical contradiction.

[0052] [3. Third embodiment of the present technology (detection device example 3)] A detection device according to another embodiment of the present technology will be described with reference to Fig. 5. Fig. 5 is a schematic diagram showing a configuration example of a detection device 10 according to one embodiment of the present technology. The same components as those in the other embodiments described above are given the same reference numerals, and repeated description will be omitted.

[0053] Fig. 5A shows a state of the detection device 10 under normal circumstances. As shown in Fig. 5A, the cable 11 is disposed in the container 21. Specifically, the cable is disposed in the lid 22 of the container 21. Although not shown in the figure, materials are stored in the container 21.

[0054] There is no particular limitation on the material of the container 21. A concrete material is mainly used as an example of the material of the container 21. Other examples of the material that may be used include a metal material, a resin material, and a rubber material.

[0055] The detection device 10 includes a detection unit 12 connected to a cable 11. The cable 11 passes through an opening 27 of a container 21, and further through a pipe 24 to be connected to the detection unit 12.

[0056] It is preferable that the detection unit 12 is disposed outside the container 21. It is also preferable that the detection unit 12 is disposed at a position higher than the container 21. In this way, even if the inside of the container 21 is flooded with water, the detection unit 12 can detect the tensile force acting on the cable 11 without being affected by the flooding.

[0057] A support part 15 is provided on the container 21. Specifically, the support part 15 is provided on the bottom part 26 of the container 21. The cable 11 connected to the lid body 22 is connected to the detection part 12 via the support part 15. The support part 15 may be, for example, an eye bolt. The cable 11 is connected to the detection part 12 through a hole in the eye bolt. This keeps the cable 11 taut without sagging. As a result, when the lid body 22 is opened and the cable 11 is pulled, the detection part 12 can easily detect the pulling force acting on the cable 11.

[0058] The position of the support portion 15 is not limited as long as the cable 11 can be kept taut. For example, the support portion 15 may be disposed on the side wall portion 28 of the container 21.

[0059] As described above, the detection unit 12 is preferably a limit switch. The limit switch 12 has a switch 121 having at least one magnet. The switch 121 is connected to the cable 11. Under normal circumstances, the magnets are in contact with each other. At this time, the contacts in the switch 121 are closed, and the switch 121 is in an off state.

[0060] Fig. 5B shows the state of the detection device 10 in an abnormal state. As shown in Fig. 5B, when the lid 22 of the container 21 that contains the materials is opened, the cable 11 is pulled. As a result, the switch 121 connected to this cable 11 is pulled, and the magnet is put into a non-contact state. At this time, the contacts in the switch 121 open, and the switch 121 is turned on. With this mechanism, the detection unit 12 can detect the pulling force acting on the cable 11. As a result, the detection device 10 can detect the theft of materials.

[0061] Although the connection part 25 that connects the cable 11 and the lid body 22 is not particularly limited, it is preferable that the connection part 25 is disposed near the side where the lid body 22 opens. In particular, it is preferable that the connection part 25 is disposed on the side opposite to the side where the opening part 27 of the container 21 is disposed, rather than approximately the center of the lid body 22. In this way, when the lid body 22 opens, a pulling force is immediately applied to the cable 11.

[0062] If the connection portion 25 is located at a position far from the side where the lid body 22 opens (for example, approximately in the center of the lid body 22), tensile stress is unlikely to act on the cable 11 even when the lid body 22 is opened, and there is a risk that the detection portion 12 will not be able to detect that the lid body 22 has been opened.

[0063] The detection device 10 may further include a notification unit 13. The notification unit 13 is connected to the detection unit 12 and can notify an external device that a pulling force has been detected.

[0064] The detection device 10 may further include an intimidating unit 14. The intimidating unit 14 is connected to the detection unit 12 and can intimidate a person who applies a pulling force.

[0065] The above description of the detection device according to the third embodiment of the present technology can be applied to other embodiments of the present technology unless there is any particular technical contradiction.

[0066] [4. Fourth embodiment of the present technology (detection device example 4)] A detection device according to another embodiment of the present technology will be described with reference to Fig. 6. Fig. 6 is a schematic diagram showing a configuration example of a detection device 10 according to one embodiment of the present technology. The same components as those in the other embodiments described above are given the same reference numerals, and repeated description will be omitted.

[0067] Fig. 6A shows the state of the detection device 10 under normal circumstances. The leftmost drawing in Fig. 6A is a cross-sectional view of the detection device 10 as viewed from the direction in which the detection device 10 extends. The rightmost drawing in Fig. 6A is a side view of the detection device 10 as viewed from a direction parallel to the ground.

[0068] 6A, the cable 11 is disposed in a container 21. In this configuration example, a U-shaped groove is shown as a specific example of the container 21. Materials 23 are stored in the container 21.

[0069] There is no particular limitation on the material of the container 21. A concrete material is mainly used as an example of the material of the container 21. Other examples of the material that may be used include a metal material, a resin material, and a rubber material.

[0070] The detection device 10 includes a detection unit 12 connected to the cable 11. The detection unit 12 is preferably disposed outside the container 21. Moreover, the detection unit 12 is preferably disposed at a position higher than the container 21. As a result, even if the inside of the container 21 is flooded with water, the detection unit 12 can detect the tensile force acting on the cable 11 without being affected by the flooding.

[0071] As described above, the detection unit 12 is preferably a limit switch. The limit switch 12 has a switch 121 having at least one magnet. The switch 121 is connected to the cable 11. Under normal circumstances, the magnets are in contact with each other. At this time, the contacts in the switch 121 are closed, and the switch 121 is in an off state.

[0072] Fig. 6B shows the state of the detection device 10 when an abnormality occurs. The leftmost drawing in Fig. 6B is a cross-sectional view of the detection device 10 when viewed from the direction in which the detection device 10 extends. The rightmost drawing in Fig. 6B is a side view of the detection device 10 when viewed from a direction horizontal to the ground.

[0073] As shown in Fig. 6B, when the container 21 containing the materials 23 moves, the cable 11 is pulled. As a result, the switch 121 connected to the cable 11 is pulled, and the magnet is put into a non-contact state. At this time, the contacts in the switch 121 open, and the switch 121 is turned on. With this mechanism, the detection unit 12 can detect the pulling force acting on the cable 11. As a result, the detection device 10 can detect the theft of the materials 23.

[0074] Although the connection part 25 that connects the cable 11 and the container 21 is not particularly limited, it is preferable that the connection part 25 is disposed near the side where the container 21 opens. As a result, when the container 21 opens, a tensile force acts on the cable 11 immediately. If the connection part 25 is disposed in a position far from the side where the container 21 opens (for example, approximately in the center of the container 21), a tensile stress is unlikely to act on the cable 11 even if the container 21 opens, and there is a risk that the detection part 12 will not be able to detect that the container 21 has been opened.

[0075] The detection device 10 may further include a notification unit 13. The notification unit 13 is connected to the detection unit 12 and can notify an external device that a pulling force has been detected.

[0076] The detection device 10 may further include an intimidating unit 14. The intimidating unit 14 is connected to the detection unit 12 and can intimidate a person who applies a pulling force.

[0077] The above description of the detection device according to the fourth embodiment of the present technology can be applied to other embodiments of the present technology unless there is any particular technical contradiction.

[0078] [5. Fifth embodiment of the present technology (detection device example 5)] A detection device according to another embodiment of the present technology will be described with reference to Fig. 7. Fig. 7 is a schematic diagram showing a configuration example of a detection unit 12 according to one embodiment of the present technology. In particular, Fig. 7 shows a configuration example of a limit switch, which is an example of the detection unit 12. Components similar to those in the other embodiments described above are given the same reference numerals, and repeated description will be omitted.

[0079] Fig. 7A shows the state of the detection unit 12 under normal circumstances. As shown in Fig. 7A, the limit switch 12 has a switch 121 having at least one magnet. The switch 121 is connected to a cable 11. The cable 11 passes through a pipe 24 and is connected to materials or a container that contains materials, or both.

[0080] Under normal circumstances, the magnets are in contact with each other. At this time, the contacts in switch 121 are closed, and switch 121 is in the off state.

[0081] FIG. 7B shows the state of the detection unit 12 in an abnormal state. As shown in FIG. 7B, when the materials or a container that contains the materials is moved, the cable 11 is pulled. As a result, the switch 121 connected to this cable 11 is pulled, and the magnet is put into a non-contact state. At this time, the contacts in the switch 121 open, and the switch 121 is turned on. With this mechanism, the detection unit 12 can detect the pulling force acting on the cable 11. As a result, the detection device 10 can detect the theft of materials.

[0082] Alternatively, the detection unit 12 may detect the current flowing through the cable 11. When the cable 11 is cut, the current stops flowing through the cable 11. At this time, the switch is turned on. With this mechanism, the detection unit 12 can detect the cut of the cable 11. As a result, the detection device 10 can detect the theft of materials.

[0083] Although not shown in the figure, the detection unit 12 may have a light emitting unit and a light receiving unit, and detect that the housing of the detection unit 12 is opened by emitting and receiving light.

[0084] The above description of the detection device according to the fifth embodiment of the present technology can be applied to other embodiments of the present technology unless there is any particular technical contradiction.

[0085] The present technology can also be configured as follows. [1] a cable disposed on the material or a container containing the material, or both; a detector connected to the cable, A detection device in which the detection unit detects a tensile force acting on the cable. [2] The detection unit is a limit switch. [1] A detection device according to the invention. [3] The limit switch is a switch having at least one magnet; the switch is connected to the cable; The switch is turned on or off depending on whether the magnet is in contact or not. [2] A detection device according to the present invention. [4] The cable is disposed on a lid of a container in which the material is stored. A detection device according to any one of [1] to [3]. [5] A connection portion for connecting the cable and the lid is disposed near the side where the lid opens. [4] A detection device according to the present invention. [6] A support is provided on the container, The cable is connected to the detection unit via the support unit. A detection device according to any one of [1] to [5]. [7] The detection unit is disposed outside the container. A detection device according to any one of [1] to [6]. [8] The tension sensor further includes a notification unit connected to the detection unit and configured to notify an external device that the tension force has been detected. A detection device according to any one of [1] to [7]. [9] The device further includes a threat unit connected to the detection unit and configured to threaten a person who exerts the pulling force. A detection device according to any one of [1] to [8].

[10] The material is connected to a solar power plant. A detection device according to any one of [1] to [9]. [Explanation of symbols]

[0086] 10. Detection Device 11 Cable 12 Detection section 121 Switch 13 Notification Department 14 Intimidation Department 15 Support part 21 Container 22 Lid 23 Materials 24 Piping 25 Connection

Claims

1. a cable disposed on the material or a container containing the material, or both; a detector connected to the cable, A detection device in which the detection unit detects a tensile force acting on the cable.

2. The detection unit is a limit switch. The detection device according to claim 1 .

3. The limit switch is a switch having at least one magnet; the switch is connected to the cable; The switch is turned on or off depending on whether the magnet is in contact or not.

3. The detection device according to claim 2.

4. The cable is disposed on a lid of a container in which the material is stored.

4. A detection device according to claim 1.

5. A connection portion for connecting the cable and the lid is disposed near the side where the lid opens.

5. The detection device according to claim 4.

6. A support is provided on the container, The cable is connected to the detection unit via the support unit.

4. A detection device according to claim 1.

7. The detection unit is disposed outside the container.

4. A detection device according to claim 1.

8. The tension sensor further includes a notification unit connected to the detection unit and configured to notify an external device that the tension force has been detected.

4. A detection device according to claim 1.

9. The device further includes a threat unit connected to the detection unit and configured to threaten a person who exerts the pulling force.

4. A detection device according to claim 1.

10. The material is connected to a solar power plant.

4. A detection device according to claim 1.

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