Safety monitoring device

Abstract

The invention discloses a safety monitoring device, including a housing, a detachable fixture for fixing a plug-in is provided in the housing, a hook portion protruding outward is provided at the outer edge of the fixture, a hook groove corresponding to the hook portion is provided on the inner wall of the housing, an edge wrapping cavity is provided at the outer edge of the housing, and a counterweight is provided in the edge wrapping cavity. The invention realizes convenient taking and disassembly of the fixture, improves the efficiency of maintenance, can play a protective role when the housing falls, protects the plug-in, and improves the service life of the housing, and the fixture is firmly installed and is suitable for all power distribution networks.

Description

Technical Field

[0001] The invention belongs to the field of power distribution network, in particular to a safety monitoring device. Background Art

[0002] The distribution network is composed of overhead lines, cables, towers, distribution transformers, disconnectors, reactive power compensators and some ancillary facilities, and plays an important role in distributing electric energy in the power grid. Due to the large amount of electricity received, it is necessary to monitor the safety of the received electricity.

[0003] The safety monitoring device mainly includes a shell and a detachable plug-in in the shell. In existing safety monitoring devices, it is inconvenient to disassemble the plug-in. Usually, the entire device needs to be disassembled, which is labor-intensive and affects the maintenance efficiency. In addition, if the shell falls during maintenance, the plug-in inside is easily damaged by impact, which affects the service life of the plug-in. Summary of the invention

[0004] In order to solve the above deficiencies in the prior art, the present invention aims to provide a safety monitoring device to facilitate the disassembly and assembly of the plug-in, improve the maintenance efficiency, and effectively protect the plug-in.

[0005] To achieve the above-mentioned purpose, the technical solution adopted by the present invention is as follows: a safety monitoring device, including a shell, in which a detachable clamp for fixing a plug-in is provided, the outer edge of the clamp is provided with a hook portion protruding outward, and the inner wall of the shell is provided with a hook groove corresponding to the hook portion.

[0006] As a limitation of the present invention: a pair of slide grooves are provided on the inner wall of the shell along the disassembly direction of the fixture, the spacing between the pair of slide grooves is adapted to the width of the fixture, and guide bars matching the shape of the slide grooves are provided on the outer edges on both sides of the width direction of the fixture, and the fixture is slidably installed in the shell through the slide grooves and the guide bars.

[0007] As a limitation of the present invention: an edge of the shell is provided with an edge-wrapped cavity, and a counterweight is provided in the edge-wrapped cavity.

[0008] As a limitation of the present invention: the fixture is provided with a plug-in slot for placing the plug-in, the side wall of the plug-in slot is provided with a barb for fixing the plug-in, and the bottom of the plug-in slot is provided with a heat dissipation hole for heat dissipation of the plug-in.

[0009] As a further limitation of the present invention: the outer ends on both sides of the width direction of the clamp extend to both sides of the clamp to form two protruding folded ear portions, the hook portion is arranged on the outside of the folded ear portion, the slide groove is provided with a flared portion matching the folded ear portion, and the hook groove is opened on the flared portion.

[0010] As a further limitation of the present invention: a buffer structure is also provided in the hemming cavity, and the buffer structure includes at least one of an elastic buffer structure and a ball buffer structure:

[0011] The elastic buffer structure includes a second elastic sheet disposed in the edge wrapping cavity, the second elastic sheet protrudes outward from the shell, and a spring is disposed inside the second elastic sheet;

[0012] The ball buffer structure includes a plurality of shock-absorbing balls filled in the edge-wrapping cavity, and the shock-absorbing balls are made of elastic material;

[0013] When both the elastic buffer structure and the ball buffer structure are provided in the edge-wrapping cavity, the elastic buffer structure and the ball buffer structure are separated by a baffle.

[0014] As a further limitation of the present invention: the clamp is provided with raised portions along the length and width directions of the clamp for reinforcing the clamp structure, the clamp is also provided with a screw hole plate with a main body surface spaced apart from the clamp, the screw hole plate is provided with a first screw hole for fixing the clamp in the shell, and a second screw hole is provided on the shell at a position corresponding to the first screw hole.

[0015] As a further limitation of the present invention: an elastic component for making the clamp pop out is fixedly provided at the bottom of the housing in the direction of clamp installation.

[0016] As a further limitation of the present invention: the elastic component includes an abutment block that contacts the fixture and applies force to the fixture, the shape of the abutment block facing one end of the fixture is adapted to the fixture, the end of the abutment block away from the fixture is connected to a first spring sheet arranged on the inner wall of the shell, the first spring sheet is an arc-shaped sheet protruding toward the abutment block, and the protruding end of the first spring sheet is connected to the abutment block.

[0017] As a limitation of the present invention: both ends of the first elastic sheet are integrally provided with anti-dropout parts having a thickness greater than that of the first elastic sheet, and an anti-dropout groove for accommodating the anti-dropout part and preventing the anti-dropout part from dropping out is provided in the shell.

[0018] Due to the adoption of the above technical solution, the present invention has the following beneficial effects compared with the prior art:

[0019] (1) The present invention provides a hooking portion and a hooking groove, and disassembles the fixture in the housing so that it can be easily disassembled and the maintenance efficiency is improved. Furthermore, a slide groove is provided in the housing, and a guide bar is provided on the fixture. When the plug-in fixed on the fixture needs to be taken out for maintenance, the fixture can be pulled out or poured out along the slide groove to expose the plug-in. A folding ear portion is provided on the fixture, and a flared portion is provided on the slide groove. The flared portion not only makes it easier for the fixture and the plug-in to enter the housing, but also cooperates with the folding ear portion. The hooking portion can be removed from the hooking groove by pinching the folding ear portion, making the disassembly of the fixture more convenient.

[0020] (2) The present invention is provided with an elastic component inside the shell, and the elastic component includes an abutment block and a first spring sheet. When the fixture is installed in the shell, the fixture presses the abutment block downward, thereby deforming the first spring sheet and exerting a force on the abutment block, thereby making the fixture installed in the shell more secure. When the fixture needs to be taken out, the folded ear portion is pinched to make the hook portion disengage from the hook groove. The fixture can be ejected outward under the action of the abutment block, which facilitates the removal of the fixture.

[0021] (3) The edge of the outer shell of the present invention is provided with an edge cavity, and a counterweight is provided in the edge cavity. When the shell falls, the counterweight can shift the center of gravity of the shell, so that the edge cavity lands first, which can buffer the impact caused by the shell falling and play a protective role. The edge cavity is detachably arranged on the shell, and can be replaced when the edge cavity is damaged, thereby improving the service life of the shell. In addition, an elastic buffer structure and a ball buffer structure are provided in the edge cavity, which can further improve the shock absorption effect, prevent damage to the shell, and protect the plug-in.

[0022] (4) The fixture of the present invention is provided with a plug-in slot, and a barb is provided on the side wall of the plug-in slot. When the plug-in is placed into the plug-in slot, the barb is deformed. After the plug-in is fixed, the barb will fix the plug-in due to its own elastic deformation, thereby improving the fixing effect of the plug-in; a heat dissipation hole is provided at the bottom of the plug-in slot to facilitate the heat dissipation of the plug-in; a protrusion is provided on the fixture to strengthen the fixture structure and improve the strength of the fixture. The setting of the first screw hole and the second screw hole can make the fixture more stably fixed in the shell. There is a distance between the screw hole plate and the fixture to prevent the bolt from damaging the plug-in.

[0023] In summary, the present invention realizes convenient removal and disassembly of the clamp, improves the efficiency of maintenance, can play a protective role when the shell falls, protects the plug-in, and increases the service life of the shell. The clamp is firmly installed and is suitable for all distribution networks. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] The present invention is further described in detail below with reference to the accompanying drawings and specific embodiments.

[0025] Figure 1It is a schematic diagram of the three-dimensional structure of an embodiment of the present invention;

[0026] Figure 2 A cross-sectional view of an embodiment of the present invention Figure 1 ;

[0027] Figure 3 For the embodiment of the present invention Figure 2 Enlarged view of part A in the middle;

[0028] Figure 4 For the embodiment of the present invention Figure 2 Enlarged view of middle part B;

[0029] Figure 5 A cross-sectional view of an embodiment of the present invention Figure 2 ;

[0030] Figure 6 For the embodiment of the present invention Figure 5 Enlarged view of the middle C part;

[0031] Figure 7 For the embodiment of the present invention Figure 5 Enlarged view of the middle D part;

[0032] Figure 8 A cross-sectional view of an embodiment of the present invention Figure 3 ;

[0033] Fig. 9 For the embodiment of the present invention Figure 8 Enlarged view of the middle E part;

[0034] Fig.10 The three-dimensional structure of the clamp in the embodiment of the present invention is shown in FIG. Figure 1 ;

[0035] Fig.11 The three-dimensional structure of the clamp in the embodiment of the present invention is shown in FIG. Figure 2 .

[0036] In the figure: 1-shell, 2-clamp, 3-opening and closing door, 4-opening and closing groove, 5-edge cavity, 6-counterweight, 7-second spring piece, 8-spring, 9-shock-absorbing ball, 10-baffle, 11-hook portion, 12-slide groove, 13-guide bar, 14-slide bar, 15-folding ear portion, 16-expanding portion, 17-abutment block, 18-first spring piece, 19-anti-slip portion, 20-anti-slip groove, 21-anti-slip block, 22-plug-in slot, 23-barb, 231-first connecting portion, 232-second connecting portion, 233-barb portion, 24-barb groove, 25-heat dissipation hole, 26-protrusion, 27-notch portion, 28-screw hole plate, 29-first screw hole, 30-second screw hole, 31-heat dissipation protrusion. DETAILED DESCRIPTION

[0037] The preferred embodiments of the present invention are described below in conjunction with the accompanying drawings. It should be understood that the safety monitoring device described herein is a preferred embodiment, which is only used to illustrate and explain the present invention and does not constitute a limitation of the present invention.

[0038] The directional terms or positional relationships such as "up", "down", "left" and "right" described in the present invention are based on the directional relationships in the drawings of the present invention specification and are only for the convenience of describing the present invention and simplifying the description. They do not indicate or imply that the device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the content protected by the present invention.

[0039] Example Safety Monitoring Device

[0040] In this embodiment, Figures 1 to 11 As shown, a safety monitoring device comprises a housing 1 in which a fixture 2 for fixing a plug-in is detachably provided.

[0041] like Figure 1 As shown, the housing 1 is a relatively flat rectangular hollow structure, and one end surface of the housing 1 is rotatably connected to an opening and closing door 3 to facilitate the inspection and maintenance of the internal plug-in. Figure 3 As shown, the opening and closing door 3 is connected to the housing 1 through a coil spring for keeping the opening and closing door 3 normally closed. The coil spring keeps the opening and closing door 3 normally closed to protect the fixture 2 and the plug-in in the housing 1. An opening and closing slot 4 is provided at one end of the opening and closing door 3 facing the housing 1 and away from the coil spring. When the opening and closing door 3 needs to be opened, the opening and closing door 3 can be opened by hand through the opening and closing slot 4.

[0042] The outer edge of the housing 1 is detachably provided with an edge-wrapping cavity 5, such as Figure 6 As shown, the edge cavity 5 is a hollow cavity adapted to the shape of the outer edge of the shell 1. In this embodiment, the edge cavity 5 is arranged at two corners of the shell 1 far from the closing door 3, and is a right-angle hollow cavity structure covering the two corners. Of course, the edge cavity 5 can also be arranged at other positions on the outer edge of the shell 1 as needed. A counterweight 6 is arranged in the edge cavity 5. When the shell 1 falls, the counterweight 6 can shift the center of gravity of the shell 1, so that the edge cavity 5 lands first, which can buffer the impact caused by the fall of the shell 1 and play a protective role.

[0043] Furthermore, an elastic buffer structure and a ball buffer structure are also provided in the edge cavity 5. The elastic buffer structure includes a second spring sheet 7 provided in the edge cavity 5, the second spring sheet 7 protrudes outward from the shell 1, and a spring 8 is provided on the inner side (i.e., the other side of the protruding side) of the second spring sheet 7. The ball buffer structure includes a plurality of shock-absorbing balls 9 filled in the edge cavity 5, and the shock-absorbing balls 9 are made of elastic material. The shock-absorbing balls 9 in this embodiment are made of silicone. Of course, the material of the shock-absorbing balls 9 can also be made of other elastic materials such as sponge. Since in this embodiment, there are both an elastic buffer structure and a ball buffer structure in the edge cavity 5, a baffle 10 is provided in the edge cavity 5 of this embodiment, and the baffle 10 divides the edge cavity 5 into a first cavity for accommodating the elastic buffer structure and a second cavity for accommodating the ball buffer structure. The counterweight 6 is fixed in the second cavity. Of course, it is also possible to provide only one of the elastic buffer structure or the ball buffer structure in the edge cavity 5 as needed, and the baffle 10 may not be provided in this case. The elastic buffer structure and the ball buffer structure can further improve the shock absorption effect, prevent damage to the housing 1, and thus protect the plug-in.

[0044] In the hollow structure of the housing 1, a detachable fixture 2 for fixing the plug-in is provided. The fixture 2 is a flat rectangular structure made of elastic material. Figure 7 As shown, a hook portion 11 protruding outward is provided on the outer edge of the fixture 2, and a hook groove corresponding to the hook portion 11 is provided on the inner wall of the housing 1. After the fixture 2 is placed in the housing 1, the hook portion 11 is inserted into the hook groove to fix the fixture 2 in the housing 1. Further, as Figure 5 , Fig. 9 As shown, a pair of slide grooves 12 are provided on the inner wall of the housing 1 along the disassembly direction of the fixture 2, the spacing between the pair of slide grooves 12 is adapted to the width of the fixture 2, and guide bars 13 matching the shape of the slide grooves 12 are provided on the outer edges of both sides of the width direction of the fixture 2, and the fixture 2 is slidably installed in the housing 1 through the slide grooves 12 and the guide bars 13. In this embodiment, the slide groove 12 is provided by a slide bar 14 fixed in the housing 1, that is, two slide bars 14 parallel to each other are provided in the housing 1, and the slide groove 12 is provided on the slide bar 14. Of course, the slide groove 12 can also be directly opened on the inner wall of the housing 1. Further, the slide groove 12 is two rectangular grooves opened along the disassembly direction of the fixture 2, and correspondingly, rectangular strip-shaped protrusions that can match the rectangular grooves are integrally provided on both sides of the fixture 2.

[0045] like Figure 7As shown, in order to facilitate the disassembly of the fixture 2, the outer ends on both sides of the width direction of the fixture 2 (the outer ends are the ends facing the opening and closing door 3 after the fixture 2 is installed in the housing 1) extend to the outside of the two sides of the fixture 2 to form two protruding folding ears 15, and the folding ears 15 are sheet-like structures that gradually separate to the two sides of the fixture 2. The hooking part 11 is arranged on the outside of the folding ears 15, and a flared part 16 matching the folding ears 15 is formed on the slide 12, and the hooking groove is correspondingly opened on the flared part 16. Further, since the slide 12 in this embodiment is arranged on the slide bar 14, the hooking groove is also opened on the slide bar 14, and the flared part 16 forms an inclined surface opened on the slide bar 14 and opened to the outer end.

[0046] In this embodiment, the inclined surface of the flared portion 16 is set as a stepped inclined surface, and the inclined surface near the inner end (the inner end is the end far away from the closing door 3 after the fixture 2 is installed in the housing 1) is used to cooperate with the folding ear portion 15 and the hook portion 11, and there is a gap between the inclined surface near the outer end and the hook portion 11, so that when disassembly is convenient, the hook portion 11 can be pinched by hand. With this arrangement, when it is necessary to remove the plug-in fixed on the fixture 2 for maintenance, the folding ear portion 15 can be pinched to make the hook portion 11 fall out of the hook groove, and then the fixture 2 can be pulled out or poured out along the slide groove 12 to expose the plug-in, which is convenient for the maintenance of the plug-in.

[0047] Furthermore, the inner end of the fixture 2 gradually narrows to form an inclined surface, which is used in conjunction with the inclined surface of the flared portion 16 , making it more convenient to place the fixture 2 into the housing 1 .

[0048] An elastic component for ejecting the fixture 2 is fixedly disposed at the bottom of the housing 1 in the installation direction of the fixture 2. Figure 4As shown, the elastic component includes an abutment block 17 that contacts the fixture 2 and applies force to the fixture 2. The shape of the abutment block 17 facing the fixture 2 is adapted to the fixture 2, and the abutment block 17 is connected to the end away from the fixture 2 with a first elastic piece 18 arranged on the inner wall of the housing 1. The first elastic piece 18 is an arc-shaped piece protruding toward the abutment block 17, and the protruding end of the first elastic piece 18 is connected to the abutment block 17. The two ends of the first elastic piece 18 are integrally provided with an anti-slip portion 19 with a thickness greater than the first elastic piece 18. The anti-slip portion 19 in this embodiment is a rectangular block with a thickness greater than the first elastic piece 18, and an anti-slip groove 20 for accommodating the anti-slip portion 19 and preventing the anti-slip portion 19 from slipping out is provided in the housing 1. Further, in this embodiment, an anti-slip block 21 is fixedly provided on the inner wall of the housing 1, and the anti-slip groove 20 is provided on the anti-slip block 21. Of course, the anti-slip groove 20 can also be directly provided on the corresponding inner wall of the housing 1. When the fixture 2 is installed in the housing 1, the fixture 2 presses the abutment block 17 downward, thereby deforming the first elastic sheet 18 and exerting force on the abutment block 17, thereby making the fixture 2 installed in the housing 1 more secure. When the fixture 2 needs to be taken out, the folded ear portion 15 is pinched to make the hook portion 11 escape from the hook groove. The fixture 2 can be ejected outward under the action of the abutment block 17, which can facilitate the removal of the fixture 2. The elastic component can also be a spring that exerts force on the fixture 2.

[0049] In this embodiment, the fixture 2 is a flat rectangular structure adapted to the plug-in structure. Fig.10 As shown, a plug-in slot 22 for placing a plug-in is provided on the fixture 2. The size of the plug-in slot 22 matches the plug-in. A barb 23 for fixing the plug-in is provided on the side wall of the plug-in slot 22. Fig. 9 The side wall of the plug-in slot 22 is provided with a barb slot 24, and the barb 23 is arranged in the barb slot 24. The barb 23 is integrally formed with the fixture 2, and includes a first connecting portion 231 connected to the fixture 2, a second connecting portion 232 perpendicular to the first connecting portion 231, and a barb portion 233 arranged at the end of the second connecting portion 232 for fixing the plug-in. There is an angle between the first connecting portion 231 and the horizontal direction. When the plug-in is placed, the barb 23 is deformed. After the plug-in is fixed, the barb portion 233 will fix the plug-in due to its own deformation force, thereby improving the fixing effect of the plug-in. Further, the angle between the first connecting portion 231 and the horizontal direction is 1 to 5°, and the angle between the first connecting portion 231 and the horizontal direction in this embodiment is 5°. Further, an elastic metal strip is arranged in the barb 23, which can maintain the elasticity of the barb 23 and improve the life and fixing effect of the fixture 2. The elastic metal strip in this embodiment is made of copper alloy.

[0050] like Fig.10As shown, the bottom of the plug-in slot 22 is provided with heat dissipation holes 25 for heat dissipation of the plug-in. The heat dissipation holes 25 in this embodiment are evenly distributed on the bottom of the plug-in slot 22. Furthermore, heat dissipation protrusions 31 are evenly distributed on the bottom of the plug-in slot. The heat dissipation protrusions 31 can leave a certain gap between the heat-generating plug-in and the fixture, so that the heat between the heat dissipation holes can be dispersed to the vicinity of different heat dissipation holes through airflow and discharged, and when the heat-generating plug-in is installed, the heat-generating plug-in can cause the heat dissipation protrusions 31 to produce a certain deformation, thereby protecting the heat-generating plug-in from stress bending to a certain extent. Since the plug-in slot 22 is provided, the thickness of the corresponding position of the fixture 2 is reduced. Therefore, on the fixture 2, a protrusion 26 for reinforcing the structure of the fixture 2 is provided along the length direction and width direction of the fixture 2, as shown in FIG. Fig.11 As shown, the protrusion 26 is arranged on the reverse side of the plug-in slot 22 of the fixture 2. The insertion direction of the fixture 2 is the length direction. In this embodiment, two protrusions 26 are arranged in the length direction of the fixture 2, and seven protrusions 26 are arranged in sequence with intervals in the width direction of the fixture 2. The protrusions 26 avoid the positions of the heat dissipation holes 25 and are arranged between the evenly distributed heat dissipation holes 25. Furthermore, a notch 27 is arranged on a protrusion 26 along the width direction of the fixture 2 closest to the inner end, and the notch 27 can prevent foreign objects inside the housing 1 from being blocked.

[0051] In order to further improve the stability of the fixture 2, the fixture 2 is also provided with a screw hole plate 28 with a distance between the main body surface and the fixture 2. Fig. 9 As shown, the screw hole plate 28 and the protrusion 26 are arranged on the same side of the fixture 2. The cross section of the screw hole plate 28 is "L"-shaped, and one end thereof is integrally arranged on the fixture 2, so that the main surface of the screw hole plate 28 and the fixture 2 have a spacing, and a first screw hole 29 for fixing the fixture 2 in the housing 1 is arranged on the main surface of the screw hole plate 28, and a second screw hole 30 is arranged on the housing 1 at a position corresponding to the first screw hole 29. There is a spacing between the screw hole plate 28 and the fixture 2, which can prevent the bolts from damaging the plug-in.

[0052] When using this embodiment, when it is necessary to inspect the plug-in inside the monitoring device, first unscrew the bolts on the first screw hole 29 and the second screw hole 30, open the opening and closing door 3 by hand through the opening and closing groove 4, pinch the folding ear portion 15, so that the hook portion 11 is disengaged from the hook groove, and then pull out or pour out the fixture 2 along the slide groove 12 to expose the plug-in. When the plug-in needs to be replaced, the barb portion 233 is opened to replace the plug-in. When the plug-in or the fixture 2 needs to be put back, repeat the reverse operation. When this embodiment falls, the counterweight block 6 can move the center of gravity of the entire device downward, so that the impact force is concentrated in the hemming cavity 5 where the counterweight block 6 is located.

Claims

1. A safety monitoring device, comprising a housing, in which a fixture for fixing a plug-in is detachably provided, characterized in that: The outer edge of the clamp is provided with a hooking portion protruding outward, and the inner wall of the shell is provided with a hooking groove corresponding to the hooking portion; An elastic component for making the clamp pop out is fixedly provided at the bottom of the housing in the direction of clamp installation; The elastic component includes an abutment block that contacts the fixture and applies force to the fixture, the shape of the abutment block facing the fixture is adapted to the fixture, and the end of the abutment block away from the fixture is connected to a first elastic sheet, the first elastic sheet is an arc-shaped sheet protruding toward the abutment block, and the protruding end of the first elastic sheet is connected to the abutment block; The outer edge of the shell is provided with an edge-wrapped cavity, and a counterweight block is arranged in the edge-wrapped cavity; The fixture is provided with a plug-in slot for placing the plug-in, the side wall of the plug-in slot is provided with a barb for fixing the plug-in, and the bottom of the plug-in slot is provided with a heat dissipation hole for heat dissipation of the plug-in; The clamp is provided with raised portions along the length and width directions of the clamp for reinforcing the clamp structure. The clamp is also provided with a screw hole plate with a main body surface spaced apart from the clamp. The screw hole plate is provided with a first screw hole for fixing the clamp in the shell, and a second screw hole is provided at a position on the shell corresponding to the first screw hole.

2. The safety monitoring device according to claim 1, characterized in that: A pair of slide grooves are arranged on the inner wall of the shell along the disassembly direction of the fixture, the spacing between the pair of slide grooves is adapted to the width of the fixture, and guide bars matching the shape of the slide grooves are arranged on the outer edges on both sides of the width direction of the fixture, and the fixture is slidably installed in the shell through the slide grooves and the guide bars.

3. The safety monitoring device according to claim 2, characterized in that: The outer ends on both sides of the clamp in the width direction extend to both sides of the clamp to form two protruding folding ears, the hooking part is arranged on the outside of the folding ear, the slide groove is provided with a flared part matching the folding ear, and the hooking groove is opened on the flared part.

4. The safety monitoring device according to claim 1, characterized in that: Anti-dropout parts with a thickness greater than that of the first elastic piece are integrally provided at both ends of the first elastic piece, and an anti-dropout groove for accommodating the anti-dropout part and preventing the anti-dropout part from dropping out is provided in the shell.

5. The safety monitoring device according to claim 1, characterized in that: A buffer structure is also provided in the hemming cavity, and the buffer structure includes at least one of an elastic buffer structure and a ball buffer structure: The elastic buffer structure includes a second elastic sheet arranged in the edge wrapping cavity, the second elastic sheet protrudes outward from the shell, and a spring is arranged inside the second elastic sheet; The ball buffer structure includes a plurality of shock-absorbing balls filled in the edge-wrapping cavity, and the shock-absorbing balls are made of elastic material; When both the elastic buffer structure and the ball buffer structure are provided in the edge-wrapping cavity, the elastic buffer structure and the ball buffer structure are separated by a baffle.

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