Portable sensitive area electric larceny and leakage detector

Abstract

The invention belongs to the field of power distribution network detection equipment, and particularly discloses a portable sensitive area electricity stealing and leakage detector which comprises a portable box, a detector body and a plurality of current transformers, the portable box comprises a box body and a box cover, and the box cover is arranged at an opening in the upper portion of the box body; the detector body is mounted in the middle of the box body, a plurality of winding mechanisms corresponding to the current transformers are arranged in a cavity in the box body, the current transformers are arranged outside the box body and connected with one end of the cable, the cable penetrates through a cable hole formed in the box body, extends into the cavity and is wound on the winding mechanisms, and the other end of the cable is electrically connected with the detector body; the winding mechanism comprises a cable winding roller and a cable arranging assembly, the cable penetrates through the cable arranging device to be wound on the cable winding roller, and the cable winding roller and the cable arranging assembly are both connected with the winding power assembly. According to the device, the detection efficiency of electric larceny and leakage of a transformer area can be remarkably improved, and a used cable can be quickly wound, so that the problems of measurement disorder and the like caused by disordered lines are effectively avoided.

Description

Technical Field

[0001] The invention belongs to the field of distribution network detection equipment, and particularly relates to a portable detector for detecting electricity theft and leakage in sensitive areas of a power grid. Background Art

[0002] In recent years, there have been more and more ways and methods of three-dimensional electricity theft and over-capacity in sensitive areas of a power grid. These behaviors not only cause huge losses to the country and directly affect the development of the power department, but also seriously disrupt the normal power supply order and even threaten the safe and stable operation of the power grid. In view of the serious impacts and consequences caused by electricity theft and over-capacity behaviors, the power supply department has invested a large amount of manpower and material resources to explore and investigate electricity theft behaviors, but the effects are not very satisfactory. Illegal electricity use behaviors (such as electricity theft and over-capacity) are diverse, frequent, and concealed. There are current situations such as insufficient manpower for on-site inspection and evidence collection, blind actions, and lagging law enforcement, which have caused serious adverse effects.

[0003] Traditional methods for detecting electricity theft or leakage are to use a clamp-on ammeter or a current transformer to measure the current before the service drop enters the ground and before the user's meter respectively, and then record, compare, and judge. During this period, maintenance personnel need to measure the three-phase current simultaneously at the head end and the tail end of the low-voltage line respectively, which requires connecting the detector to the current transformer between different measurement points using cables. The on-site operation environment is complex, and problems such as disordered and tangled cables often occur. When using it again, the cables cannot be sorted out clearly, which may lead to measurement errors. Summary of the Invention

[0004] In order to solve the deficiencies of the prior art, the invention aims to provide a portable detector for detecting electricity theft and leakage in sensitive areas of a power grid. This device can significantly improve the detection efficiency of electricity theft and leakage in the area, is simple and convenient to use, and can quickly wind up the cables after use, thus effectively avoiding problems such as measurement confusion caused by disordered cables.

[0005] To achieve the above object, the technical solution adopted by the invention is as follows: A portable detector for detecting electricity theft and leakage in sensitive areas of a power grid, comprising a portable box, a detector body, and a plurality of current transformers. The portable box includes a box body and a box cover, and the box cover is arranged at the opening above the box body; the detector body is installed in the middle of the box body, and a plurality of winding mechanisms corresponding to the current transformers are arranged in the cavity of the box body. The current transformers are arranged outside the box body and are connected to one end of a cable. The cable passes through a wire hole opened on the box body and extends into the cavity and is wound around the winding mechanism. The other end of the cable is electrically connected to the detector body; the winding mechanism includes a winding roller and a wire sorting component. The cable passes through the wire sorter and is wound around the winding roller, and both the winding roller and the wire sorting component are connected to a winding power component.

[0006] Preferably, the winding power assembly includes a winding motor and a rotating shaft. The winding motor is power-connected to the rotating shaft. The rotating shaft is horizontally rotatably installed in the cavity. The wire winding roller is coaxially installed on the rotating shaft, and a first pulley is coaxially fixed on the rotating shaft. The wire arranging assembly includes a wire arranging roller and a second pulley. The wire arranging roller is horizontally rotatably installed in the cavity and is arranged parallel to the rotating shaft. The second pulley is coaxially fixed to the end of the wire arranging roller. A belt is sleeved on the first pulley and the second pulley. A bidirectional thread groove is provided on the outer peripheral surface of the wire arranging roller. A sliding sleeve is movably sleeved on the wire arranging roller. A guiding block matched with the bidirectional thread groove is fixed on the inner wall of the sliding sleeve. A limiting groove is opened at the bottom of the cavity below the wire arranging roller. A limiting slider fixed below the sliding sleeve is slidably clamped in the limiting groove. A wire arranging plate is fixed above the sliding track. A wire arranging opening is opened on the wire arranging plate. The wire cable passes through the wire arranging opening movably.

[0007] Preferably, an electrical connection head is concentrically fixed at the end of the wire winding roller away from the winding motor. The wire cable is connected to the electrical connection head. A moving plate is horizontally slidably arranged in the cavity along the axial direction of the wire winding roller. An electric slip ring is coaxially installed on the moving plate along the extension line of the axial direction of the wire winding roller. An electrical plug is provided on the rotating part of the electric slip ring. One side of the electrical plug is inserted into the electrical connection head, and the other side is electrically connected to the detector body through the electric slip ring.

[0008] Preferably, a sliding rail is horizontally installed in the cavity, and the moving plate is slidably installed on the sliding rail.

[0009] Preferably, a locking bolt is installed on the moving plate, and the locking bolt abuts against the sliding rail.

[0010] Preferably, a ratchet wheel is also coaxially installed on the rotating shaft. A ratchet tooth matched with the ratchet wheel is installed on the box body in the cavity. The middle part of the ratchet tooth is rotatably arranged in the cavity. One end of the ratchet tooth is matched with the ratchet wheel, and the other end is fixed with an armature. The armature is matched with an electromagnet arranged in the cavity. One end of a tension spring is also connected to the end of the ratchet tooth close to the ratchet wheel, and the other end of the tension spring is connected to the box body.

[0011] Preferably, a top plate is provided above the box body. The detector body is arranged inside the box body, and the operation panel of the detector body is arranged in the middle of the top plate.

[0012] Preferably, an inspection opening communicating with the cavity is opened on the top plate, and a sealing cover plate is detachably installed at the inspection opening.

[0013] Preferably, a winding controller and winding control buttons are provided on the sealing cover plate. The winding control buttons, the winding motor and the electromagnet are all connected to the winding controller.

[0014] Preferably, one side edge of the box cover is hinged at the opening of the box body, and the other side is connected to the box body through a buckle structure.

[0015] The beneficial effects of the present invention are as follows: 1. When the present application performs the wire winding operation, the rotational movement of the winding motor is transmitted to the rotating shaft and the wire arranging roller through the cooperation of the two belt pulleys and the belt, thereby realizing the synchronous rotation of the winding roller and the wire arranging roller. The rotation of the winding roller enables the cable to be wound around its outer wall. When the wire arranging roller rotates, under the sliding limit of the lower limiting slider and the limiting groove of the sliding sleeve, through the guiding cooperation of the guiding block and the double-threaded groove, the sliding sleeve can move left and right uniformly and reciprocally on the surface of the wire arranging roller. Thus, under the guiding action of the wire arranging plate, the cable is pulled to move left and right reciprocally. Under the winding action of the winding roller, the cable is evenly wound around the winding roller, thereby effectively avoiding the chaos during winding.

[0016] 2. The cable on the winding roller of the present application is electrically connected to the electrical plug on the electrical slip ring through the electrical connection head in a pluggable manner, realizing the electrical connection between the cable and the electrical slip ring. Thus, when the winding roller needs to be repaired and maintained, the rapid power-off between the cable and the detector body can be achieved. The setting of the electrical slip ring can still ensure the stable electrical connection between the cable and the detector body when the cable rotates with the winding roller. Therefore, during the theft and leakage detection and the cable winding, there is no need to repeatedly plug and unplug the connection between the cable and the detector body, making it more convenient to use.

[0017] 3. Since the electrical slip ring on the moving plate of the present application and the winding roller are arranged in the same axial direction, when it is necessary to perform the plugging and unplugging operation between the electrical connection head on the winding roller and the electrical plug on the electrical slip ring, only need to push the moving plate to slide horizontally on the slide rail, then the electrical connection head and the electrical plug can be quickly docked or removed, which is more convenient for the later maintenance and repair operations.

[0018] 4. Since the winding roller is installed on the rotating shaft and can only rotate in place, after the electrical connection head and the electrical plug are docked, only need to use the locking bolt to fix the moving plate, thereby realizing the stable connection between the electrical connection head and the electrical plug, effectively avoiding the disconnection between the electrical connection head and the electrical plug when the winding roller rotates.

[0019] 5. When the present application needs to perform theft and leakage detection, the cable leaking outside the box can be pulled outwards, so that the winding roller rotates to release the wire. At this time, since the winding motor loses power, it will also rotate when being twisted by an external force, which does not affect the rotation of the rotating shaft and the winding roller. And at this time, the ratchet can also rotate normally, enabling the winding roller to rotate and release the wire normally. After pulling out the cable to the required length according to actual needs, the cooperation of the ratchet teeth and the ratchet can lock the winding roller to avoid the cable retraction affecting the detection of the end current transformer.

[0020] 6. After the theft and leakage detection is completed, press the take-up control button to perform the wire winding operation. Control the take-up motor and the electromagnet through the take-up controller. The electromagnet is energized, attracting the armature at the end of the ratchet tooth, causing the ratchet tooth to rotate. The other end of the ratchet tooth disengages from the ratchet wheel and stretches the tension spring. At this time, the take-up motor operates, driving the wire winding roller and the wire arranging roller to rotate, so that the cable is evenly and stably wound on the wire winding roller, realizing the rapid take-up operation of the cable. After the cable take-up is completed, press the take-up control button again. The take-up controller sends out a control signal, and the take-up motor and the electromagnet stop operating. At the same time, under the elastic force of the tension spring, the ratchet tooth resets, completing the wire winding operation. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 is a schematic structural diagram of the interior of the portable box of the present invention; Figure 2 is a schematic structural diagram of the exterior of the portable box of the present invention; Figure 3 is a schematic structural diagram of the take-up mechanism of the present invention; Figure 4 is a schematic installation diagram of the take-up roller of the present invention; Figure 5 is a schematic installation diagram of the ratchet wheel of the present invention. DETAILED DESCRIPTION OF THE INVENTION

[0022] The principles and features of the present invention will be described below with reference to the accompanying drawings. The examples given are only for explaining the present invention and do not limit the scope of use of the present invention.

[0023] As Figures 1-5 shown, the present invention provides a portable theft and leakage detector for sensitive power distribution areas, including a portable box, a detector body 3, and a plurality of current transformers 21. The portable box includes a box body 1 and a box cover 11. The box cover 11 is arranged at the upper opening of the box body 1, and the box cover 11 can effectively protect the instruments in the box body 1. One side edge of the box cover 11 is hinged at the opening of the box body 1, and the other side is connected to the box body 1 through a snap structure 12. When the portable box is in use, after unlocking or fastening the snap structure 12, flipping the box cover 11 to one side can realize the quick opening and closing operation of the portable box, which is very convenient to use.

[0024] A top plate is fixedly arranged at the upper opening of the box body 1. The detector body 3 is arranged inside the box body 1, and the operation panel of the detector body 3 extends out of the top plate and is arranged in the middle thereof. Maintenance openings communicating with the inner cavity of the box body 1 are opened on the top plate around the operation panel, and a sealing cover plate 14 is arranged at the maintenance openings. During specific implementation, the sealing cover plate 14 can be fixed at the maintenance openings by using screws, which is more convenient for the disassembly and installation of the sealing cover plate 14 and provides convenience for the maintenance of the take-up mechanism in the cavity later.

[0025] The detector body 3 is installed in the middle of the box body 1. A plurality of winding mechanisms corresponding to the current transformers 21 are provided in the cavity of the box body 1. The current transformers 21 are arranged outside the box body 1 and connected to one end of the cable 2. The cable 2 passes through the wire hole 13 opened on the box body 1 and extends into the cavity and is wound around the winding mechanism. Among them, the winding mechanism includes a winding roller 4 and a wire arranging component. The cable 2 passes through the wire arranger and is wound around the winding roller 4. Both the winding roller 4 and the wire arranging component are connected to the winding power component. The winding power component includes a winding motor 73 and a rotating shaft 7. The winding motor 73 is coaxially fixed to the rotating shaft 7. The rotating shaft 7 is horizontally rotatably installed in the cavity. The winding roller 4 is coaxially sleeved on the rotating shaft 7. A first pulley 71 is also coaxially fixed on the rotating shaft 7. The wire arranging component includes a wire arranging roller 5 and a second pulley 52. The wire arranging roller 5 is horizontally rotatably arranged in the cavity and is parallel to the rotating shaft 7. The second pulley 52 is coaxially fixed to the end of the wire arranging roller 5. A belt 6 is sleeved on the first pulley 71 and the second pulley 52. When the winding motor 73 drives the rotating shaft 7 to rotate, the two belt 6 wheels and the belt 6 cooperate to drive the wire arranging roller 5 to rotate synchronously. A bidirectional thread groove 50 is provided on the outer peripheral surface of the wire arranging roller 5. A sliding sleeve 51 is movably sleeved on the wire arranging roller 5. A guiding block matched with the bidirectional thread groove 50 is fixed on the inner wall of the sliding sleeve 51. A limiting groove 15 is opened at the bottom of the cavity below the wire arranging roller 5. A limiting slider 513 fixed below the sliding sleeve 51 is slidably clamped in the limiting groove 15. A wire arranging plate 511 is fixed above the slideway. A wire arranging opening 512 is opened on the wire arranging plate 511. The cable 2 movably passes through the wire arranging opening 512.

[0026] When the present application performs the wire winding operation, the rotation action of the winding motor 73 is transmitted to the rotating shaft 7 and the wire arranging roller 5 through the cooperation of the two belt 6 wheels and the belt 6, so as to realize the synchronous rotation of the winding roller 4 and the wire arranging roller 5. The rotation of the winding roller 4 enables the cable 2 to be wound around its outer wall. When the wire arranging roller 5 rotates, the sliding sleeve 51 can move left and right uniformly and reciprocally on the surface of the wire arranging roller 5 through the guiding cooperation of the guiding block and the bidirectional thread groove 50 under the sliding limit of the lower limiting slider 513 and the limiting groove 15. Thus, under the guiding action of the wire arranging plate 511, the cable 2 is pulled to move left and right reciprocally. Under the winding action of the winding roller 4, the cable 2 is evenly wound around the winding roller 4, thereby effectively avoiding the chaos during winding.

[0027] An electrical connection head 41 is concentrically fixed to the end of the winding roller 4 away from the winding motor 73. The cable 2 is connected to the electrical connection head 41. A moving plate 17 is horizontally slidably arranged in the cavity along the axis direction of the winding roller 4. An electric slip ring 8 is coaxially installed on the moving plate 17 along the extension line direction of the axis of the winding roller 4. An electrical plug 81 is fixed on the rotating part of the electric slip ring 8. One side of the electrical plug 81 is inserted into the electrical connection head 41, and the other side is electrically connected to the detector body 3 through the electric slip ring 8.

[0028] The cable 2 on the cable reel 4 of the present application is pluggably and electrically connected to the electrical plug 81 on the electrical slip ring 8 through the electrical connection head 41, realizing the electrical connection between the cable 2 and the electrical slip ring 8. Furthermore, when the cable reel 4 needs to be repaired and maintained, it can achieve a quick power-off between the cable 2 and the detector body 3. The setting of the electrical slip ring 8 can still ensure a stable electrical connection between the cable 2 and the detector body 3 when the cable 2 rotates with the cable reel 4. Thus, when detecting theft and leakage of electricity and winding the cable 2, there is no need to repeatedly plug and unplug the connection between the cable 2 and the detector body 3, making it more convenient to use.

[0029] In addition, a slide rail 16 is horizontally installed in the cavity, and the moving plate 17 is slidably installed on the slide rail 16. A locking bolt 171 is installed on the moving plate 17, and the locking bolt 171 abuts against the slide rail 16. Since the electrical slip ring 8 on the moving plate 17 of the present application and the cable reel 4 are arranged in the same axial direction, when it is necessary to perform plugging and unplugging operations between the electrical connection head 41 on the cable reel 4 and the electrical plug 81 on the electrical slip ring 8, only need to push the moving plate 17 to slide horizontally on the slide rail 16, then the electrical connection head 41 and the electrical plug 81 can be quickly docked or removed, which is more convenient for later maintenance and repair operations. Since the cable reel 4 is installed on the rotating shaft 7 and can only rotate in place, after the electrical connection head 41 and the electrical plug 81 are docked, only need to use the locking bolt 171 to fix the moving plate 17, and then realize the stable connection between the electrical connection head 41 and the electrical plug 81, thus effectively avoiding the separation of the electrical connection head 41 and the electrical plug 81 when the cable reel 4 rotates.

[0030] In addition, a ratchet wheel 72 is coaxially installed on the rotating shaft 7, and a ratchet tooth 721 that cooperates with the ratchet wheel 72 is installed on the box body 1 in the cavity. The middle of the ratchet tooth 721 is rotatably arranged in the cavity. One end of the ratchet tooth 721 cooperates with the ratchet wheel 72, and the other end is fixedly provided with an armature 723. The armature 723 cooperates with the electromagnet 18 arranged in the cavity; One end of a tension spring 722 is also connected to the end of the ratchet tooth 721 close to the ratchet wheel 72, and the other end of the tension spring 722 is connected to the box body 1.

[0031] When the present application needs to detect theft and leakage of electricity, the cable 2 leaking outside the box body 1 can be pulled outwards, causing the cable reel 4 to rotate and pay out the cable. At this time, since the winding motor 73 is powered off, it will also rotate when twisted by an external force, and thus will not affect the rotation of the rotating shaft 7 and the cable reel 4. And at this time, the ratchet wheel 72 can also rotate normally, enabling the cable reel 4 to rotate and pay out the cable normally. After pulling out the cable 2 to the required length according to actual needs, the cooperation between the ratchet tooth 721 and the ratchet wheel 72 can be used to lock the cable reel 4, avoiding the retraction of the cable 2 from affecting the detection of the end current transformer 21.

[0032] In addition, a winding controller 142 and a winding control button 141 are provided on the sealing cover plate 14. The winding control button 141, the winding motor 73, and the electromagnet 18 are all connected to the winding controller 142. After the theft and leakage detection is completed, press the winding control button 141 to perform the wire winding operation. The winding controller 142 controls the actions of the winding motor 73 and the electromagnet 18. The electromagnet 18 is energized, attracting the armature 723 at the end of the ratchet 721, causing the ratchet 721 to rotate. The other end of the ratchet 721 disengages from the ratchet wheel 72 and stretches the tension spring 722. At this time, the winding motor 73 operates, driving the wire winding roller 4 and the wire arranging roller 5 to rotate, so that the cable 2 is evenly and stably wound around the wire winding roller 4, realizing the rapid winding operation of the cable 2. After the cable 2 is wound, press the winding control button 141 again. The winding controller 142 sends a control signal, and the winding motor 73 and the electromagnet 18 stop operating. At the same time, under the elastic force of the tension spring 722, the ratchet 721 resets, completing the wire winding operation.

[0033] When using the present invention, pull the outer end of the cable 2 connected to the current transformer 21 outwards to the required length. After connecting the current transformer 21 to the detection position, use the detector body 3 to detect theft and leakage in the sensitive power area. After the detection is completed, start the winding control button 141, and use the winding controller 142 to control the actions of the winding motor 73 and the electromagnet 18, driving the wire winding roller 4 and the wire arranging roller 5 to rotate, so that the cable 2 is evenly and stably wound around the wire winding roller 4, realizing the rapid winding operation of the cable 2. When the cable 2 is wound in place, press the winding control button 141 again, the winding motor 73 and the electromagnet 18 stop operating, and the ratchet 721 resets, completing the wire winding operation.

[0034] Obviously, the embodiments described above are only a part of the embodiments of the present application, rather than all the embodiments. The drawings show the preferred embodiments of the present application, but do not limit the patent scope of the present application. The present application can be implemented in many different forms. On the contrary, the purpose of providing these embodiments is to make the understanding of the disclosed content of the present application more thorough and comprehensive. Although the present application has been described in detail with reference to the foregoing embodiments, for those skilled in the art, they can still modify the technical solutions described in the foregoing specific embodiments, or perform equivalent replacements on some of the technical features. Any equivalent structure using the specification and drawings of the present application, directly or indirectly applied in other related technical fields, is equally within the scope of the patent protection of the present application.

Claims

1. A portable detector for detecting electricity theft and leakage in sensitive power supply areas, comprising a portable case, a detector body, and a plurality of current transformers, characterized in that: The portable box includes a box body and a box cover. The box cover is arranged at the opening above the box body. The detector body is installed in the middle of the box body. A plurality of winding mechanisms corresponding to current transformers are arranged in the cavity of the box body. The current transformer is arranged outside the box body and connected to one end of a cable. The cable passes through a wire hole opened on the box body and extends into the cavity and is wound around the winding mechanism. The other end of the cable is electrically connected to the detector body. The winding mechanism includes a wire winding roller and a wire arranging component. The cable passes through a wire arranger and is wound around the wire winding roller. Both the wire winding roller and the wire arranging component are connected to a winding power component.

2. The portable leakage detector for sensitive power distribution areas according to claim 1, characterized in that: The winding power component includes a winding motor and a rotating shaft. The winding motor is power-connected to the rotating shaft. The rotating shaft is horizontally rotatably installed in the cavity. The wire winding roller is coaxially installed on the rotating shaft. A first belt pulley is coaxially fixed on the rotating shaft. The wire arranging component includes a wire arranging roller and a second belt pulley. The wire arranging roller is horizontally rotatably arranged in the cavity and is parallel to the rotating shaft. The second belt pulley is coaxially fixed to the end of the wire arranging roller. A belt is sleeved on the first belt pulley and the second belt pulley. A bidirectional thread groove is arranged on the outer peripheral surface of the wire arranging roller. A sliding sleeve is movably sleeved on the wire arranging roller. A guiding block matched with the bidirectional thread groove is fixedly arranged on the inner wall of the sliding sleeve. A limiting groove is opened at the bottom of the cavity below the wire arranging roller. A limiting slider fixedly arranged below the sliding sleeve is slidably clamped in the limiting groove. A wire arranging plate is fixedly arranged above the slideway. A wire arranging opening is opened on the wire arranging plate. The cable movably passes through the wire arranging opening.

3. The portable leakage detector for sensitive power distribution areas according to claim 2, characterized in that: An electrically conductive receiving head is concentrically fixed to the end of the wire winding roller far from the winding motor. The cable is connected to the electrically conductive receiving head. A moving plate is horizontally slidably arranged in the cavity along the axis direction of the wire winding roller. An electric slip ring is coaxially installed on the moving plate along the extension line of the axis of the wire winding roller. An electrically conductive plug is arranged on the rotating part of the electric slip ring. One side of the electrically conductive plug is inserted into the electrically conductive receiving head, and the other side is electrically connected to the detector body through the electric slip ring.

4. The portable leakage detector for sensitive power distribution areas according to claim 3, characterized in that: A slide rail is horizontally installed in the cavity. The moving plate is slidably installed on the slide rail.

5. The portable leakage detector for sensitive power distribution areas according to claim 4, wherein: A locking bolt is installed on the moving plate. The locking bolt abuts against the slide rail.

6. The portable leakage detector for sensitive power distribution areas according to claim 2, wherein: A ratchet wheel is also coaxially installed on the rotating shaft. A ratchet tooth matched with the ratchet wheel is installed on the box body in the cavity. The middle of the ratchet tooth is rotatably arranged in the cavity. One end of the ratchet tooth is matched with the ratchet wheel, and the other end is fixedly provided with an armature. The armature is matched with an electromagnet arranged in the cavity. One end of a tension spring is also connected to the end of the ratchet tooth close to the ratchet wheel, and the other end of the tension spring is connected to the box body.

7. The portable leakage detector for sensitive power distribution areas according to claim 1, wherein: A top plate is arranged above the box body. The detector body is arranged inside the box body. The operation panel of the detector body is arranged in the middle of the top plate.

8. The portable leakage detector for sensitive power distribution areas according to claim 7, wherein: An inspection opening communicating with the cavity is opened on the top plate. A sealing cover plate is detachably installed at the inspection opening.

9. The portable leakage detector for sensitive substation areas according to claim 6, wherein: A winding controller and winding control buttons are arranged on the sealing cover plate. The winding control buttons, the winding motor and the electromagnet are all connected to the winding controller.

10. The portable leakage detector for sensitive substation areas according to claim 1, characterized in that: One side edge of the box cover is hinged at the opening of the box body, and the other side is connected to the box body through a buckle structure.

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