Waterproof box for socket in outdoor use

Abstract

A waterproof box for a socket in outdoor use, comprising an upper cover (1) and a lower cover (2). The lower cover (2) comprises a bottom cover (3) and a cover ring (4) fitting the upper cover (1); the bottom of the bottom cover (3) is distant from the cover ring (4), and an opening end of the bottom cover (3) is close to the cover ring (4); a surrounding and foldable rubber block (5) is provided on the opening end of the bottom cover (3); one end of the rubber block (5) is fixedly connected to the bottom cover (3), the other end of the rubber block (5) is fixedly connected to one end of the cover ring (4), and the other end of the cover ring (4) is detachably connected to the upper cover (1); the upper cover (1), the cover ring (4), the rubber block (5) and the bottom cover (3) jointly form a sealed waterproof cavity (6); and a plurality of cable threading holes (7) in sealing fit with cables are formed in the side wall of the waterproof cavity (6). The waterproof box is foldable, and is easily stored and packed for transportation, thus achieving the objective of saving space; and according to the waterproof box, the waterproof sealing performance of the waterproof box is improved by structural design in all aspects, and the use safety of sockets is greatly improved.

Description

A waterproof box for outdoor sockets Technical Field

[0001] The present invention relates to the technical field related to waterproof boxes, and in particular to a waterproof box for outdoor sockets. Background Art

[0002] Electrical equipment is widely used in production and life, and sockets are a common way to access power.

[0003] The conditions for using sockets are uncertain, including various conditions for indoor and outdoor use. Under certain environmental conditions, such as rainy, snowy or humid environments, safety hazards may arise and cause personal injury accidents.

[0004] To avoid accidents, Chinese patent number CN205543443U, published on August 31, 2016, discloses a waterproof socket box. The box body is provided with a socket mounting seat, and a box cover is hinged on one side of the upper end of the box body. After the box cover is snapped onto the box body, it is sealed with the box body and forms one or more wire holes for the power cord to extend out of the box and seal with the power cord.

[0005] The above patent helps to improve the waterproof effect of the socket and reduces the probability of dangerous accidents to a certain extent. However, since the volume of the waterproof box is fixed, it takes up a large space when it needs to be stored or packed for transportation, which is not conducive to space saving. Summary of the Invention

[0006] The present invention aims to overcome the disadvantage of the prior art that the waterproof box occupies a large space and provides a space-saving waterproof box for outdoor socket use.

[0007] In order to achieve the above object, the present invention adopts the following technical solutions:

[0008] A waterproof box for outdoor socket use, comprising an upper cover and a lower cover, the lower cover comprising a bottom cover and a cover ring matching the upper cover, the bottom of the bottom cover being away from the cover ring, the open end of the bottom cover being close to the cover ring, a surrounding and foldable rubber block being provided on the open end of the bottom cover, one end of the rubber block being fixedly connected to the bottom cover, the other end of the rubber block being fixedly connected to one end of the cover ring, the other end of the cover ring being detachably connected to the upper cover, the upper cover, the cover ring, the rubber block and the bottom cover together forming a sealed waterproof cavity, the side walls of the waterproof cavity being provided with a plurality of threading holes that are sealed to match cables.

[0009] The lower cover includes a bottom cover and a cover ring that matches the upper cover. The bottom of the bottom cover is away from the cover ring, and the open end of the bottom cover is close to the cover ring. The open end of the bottom cover is provided with a surrounding and foldable rubber block. One end of the rubber block is fixedly connected to the bottom cover, and the other end of the rubber block is fixedly connected to one end of the cover ring. The other end of the cover ring is detachably connected to the upper cover. The upper cover, cover ring, rubber block and bottom cover together form a sealed waterproof cavity. The side wall of the waterproof cavity is provided with a plurality of threading holes that are sealed with cables. When the waterproof box is in use, the rubber block is in an unfolded state, making it easy to place a socket in the waterproof cavity for use. When the waterproof box is not in use, the rubber block can be folded by squeezing the bottom cover or the upper cover, making it easy to store and pack for transportation, thereby achieving the purpose of saving space.

[0010] Preferably, the outer diameter of the bottom cover is smaller than the inner diameter of the cover ring, and the diameter of the rubber block increases continuously and linearly from the end thereof fixedly connected to the bottom cover to the end thereof fixedly connected to the cover ring. One end of the rubber block is provided with a first folding edge, by which the rubber block is fixedly connected to the bottom cover, and the other end of the rubber block is provided with a second folding edge, by which the rubber block is fixedly connected to the cover ring. When the bottom cover or the upper cover is folded by squeezing, since the outer diameter of the bottom cover is smaller than the inner diameter of the cover ring, the bottom cover can be folded and inserted into the cover ring. At the same time, the rubber block enters between the bottom cover and the cover ring after being folded by the first and second folding edges, thereby minimizing the volume and facilitating storage.

[0011] Preferably, the vertical height between the first and second folded edges is equal to the height of the bottom cover. The rubber block is folded over the first and second folded edges to completely fit into the space formed by the cover ring and the upper cover. Furthermore, the vertical height between the first and second folded edges is equal to the height of the bottom cover. This ensures that when the bottom cover is unfolded, sufficient space is left for placing the socket, and after folding, the rubber block can be largely stored within the space formed by the cover ring and the upper cover.

[0012] Preferably, the rubber block is fixedly connected to the inner side wall of one end of the cover ring, and an annular sealing groove 1 is provided on the other end of the cover ring. An annular sealing groove 2 corresponding to the sealing groove 1 is provided on the edge of the upper cover. A waterproof strip is fixedly connected to the sealing groove 1 and the sealing groove 2 by injection molding. The cover ring is sealed to the upper cover by interference fit of the waterproof strip in the sealing groove 1 and the waterproof strip in the sealing groove 2. Several wire threading grooves are provided on the inner and outer sides of the sealing groove 1 and the sealing groove 2, and the wire threading hole is jointly composed of the wire threading groove on the sealing groove 1 and the corresponding wire threading groove on the sealing groove 2. When the cable is threaded through the threading hole, first open the upper cover, place the cable in the corresponding threading groove, and then close the upper cover so that the upper cover and the lower cover fit tightly. At this time, the corresponding parts of the waterproof strip in the sealing groove one and the waterproof strip in the sealing groove two are respectively attached to the upper and lower surfaces of the cable and perform an interference fit, thereby achieving a sealed fit between the cable and the threading hole; at the same time, since the cover ring is sealed and connected to the upper cover through the interference fit of the waterproof strip in the sealing groove one and the waterproof strip in the sealing groove two, the two waterproof strips are squeezed and tightly fitted with each other, so there is also a certain sealing and waterproof effect at the idle threading hole; the waterproof strips are connected through the injection molding process, which further improves the waterproof sealing of the waterproof box. It can be seen that this scheme comprehensively improves the waterproof sealing of the waterproof box from various aspects of structural design, and greatly improves the safety of socket use.

[0013] Preferably, the waterproof strip is made of TPE, which has high elasticity and is conducive to achieving a sealing effect through interference fit.

[0014] Preferably, the bottom of the wire threading groove on the outer wall of the sealing groove extends outward to form a protruding semi-arc groove, and the open end of the wire threading groove is located on the side wall of the open end of the sealing groove. A cable tie is fixed to one side of the open end of the semi-arc groove by injection molding, and the other side corresponding to the open end of the semi-arc groove is provided with a tie opening matching the cable tie. The cable tie and the tie opening are both located outside the semi-arc groove, and the edge of the upper cover is provided with through grooves corresponding to the cable ties on several wire threading grooves. The cable tie is located in the open end of the through groove, and the wire threading groove on the outer wall of the sealing groove II corresponds to the semi-arc groove on the outer wall of the sealing groove I and runs through both sides of the open end of the through groove. When the cable is threaded through the threading hole, first open the upper cover, place the cable in the corresponding semi-arc groove, then fix it by buckling the cable tie with the tie mouth, and close the upper cover. Since the length of the cable tie buckle is adjustable, cables of different thicknesses can be fixed, which changes the problem of single cable specification adapted to the traditional waterproof box and improves practicality; the fixing structure adopted by the cable is injection molded on the lower cover through an injection molding process, which saves labor costs compared with the traditional detachable fixing structure; the through groove provides assembly space for the buckled cable tie, thereby facilitating the closing of the upper cover; at the same time, the through groove is arranged on the upper cover, and the cable tie is arranged on the cover ring, so that when in use, the open end of the through groove faces downward and the bottom of the through groove faces upward, which is conducive to preventing water from entering the through groove and causing water accumulation.

[0015] Preferably, the edge of the cover ring and the edge of the upper cover are both provided with a plurality of puncture holes, the puncture holes being located between the second sealing groove and the through groove, the puncture holes on the cover ring corresponding to the puncture holes on the upper cover one by one, the puncture holes and the threading holes being spaced apart along the circumference of the cover ring, the puncture holes being located on the outside of the waterproof strip, the waterproof cavity being located on the inside of the waterproof strip, a support column being provided at the center of the puncture hole, the two ends of the support column being fixedly connected to the two side walls of the puncture hole, respectively. When the waterproof box is in a humid environment or is in long-term use, a cable tie or binding is used to penetrate the puncture holes on the cover ring and the upper cover respectively and wrap around the support column to tighten, so that the upper cover and the lower cover fit more tightly, and the two waterproof strips fit tightly together, which is conducive to further improving the waterproof effect.

[0016] Preferably, both inner and outer walls of the first sealing groove are provided with stepped surfaces that match the open end of the second sealing groove, and the open end of the semi-arc groove and the stepped surfaces are coplanar. This design facilitates the initial positioning of the upper cover and the cover ring when mating, and further improves the waterproof and dustproof effects.

[0017] Preferably, the waterproof strip is provided with several rectangular cable sealing areas corresponding to the wiring troughs. The length of each cable sealing area is greater than the inner diameter of the wiring trough. The cable sealing area is provided with several deformation grooves evenly distributed along its width. The sidewalls of each deformation groove are provided with arc-shaped notches, which are located within the wiring hole. The deformation grooves provide deformation space when the two waterproof strips act on the upper and lower surfaces of the cable, respectively, allowing the waterproof strips to fully contact and tightly fit the cable surface, thereby achieving a waterproof and dustproof effect. The notches also serve to indicate the placement of the cable within the waterproof strip, thereby achieving even better waterproof and dustproof effects.

[0018] Preferably, the outer edge of the upper cover is provided with several evenly distributed clips, located on the sides of the threading holes and rotatably connected to the upper cover. The cover ring is fixed with several clips that match the clips one by one. The upper cover is detachably connected to the cover ring by the clips matching the clips one by one. The upper cover is installed by means of the clips and clips, which facilitates installation and removal of the upper cover.

[0019] The beneficial effects of the present invention are: it is foldable, easy to store and pack for transportation, and achieves the purpose of saving space; this solution comprehensively improves the waterproof sealing of the waterproof box from various aspects of structural design, and greatly improves the safety of socket use; it can fix cables of different thicknesses, which changes the problem of single cable specifications adapted to traditional waterproof boxes and improves practicality; the fixing structure adopted by the cable is injection molded on the lower cover through an injection molding process, which saves labor costs compared to the traditional detachable fixing structure; when the waterproof box is in a humid environment or is used for a long time, a cable tie or a binding strap is used in conjunction with the piercing, so that the upper cover and the lower cover fit more tightly, which is conducive to further improving the waterproof effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] FIG1 is a schematic structural diagram of the present invention when it is unfolded;

[0021] FIG2 is a schematic diagram of the structure of the present invention when folded;

[0022] FIG3 is a schematic structural diagram of the upper cover and the lower cover in FIG1 when they are separated;

[0023] FIG4 is an enlarged view of the structure at point A in FIG3 ;

[0024] FIG5 is a bottom view of FIG2;

[0025] FIG6 is a cross-sectional view taken along line CC in FIG5 ;

[0026] FIG7 is an enlarged view of the structure at point B in FIG6 .

[0027] In the figure: 1. Upper cover, 2. Lower cover, 3. Bottom cover, 4. Cover ring, 5. Rubber block, 6. Waterproof cavity, 7. Threading hole, 8. Folded edge 1, 9. Folded edge 2, 10. Sealing groove 1, 11. Sealing groove 2, 12. Waterproof strip, 13. Threading groove, 14. Semi-arc groove, 15. Cable tie, 16. Through groove, 17. Punch hole, 18. Support column, 19. Step surface, 20. Cable sealing area, 21. Deformation groove, 22. Notch, 23. Buckle, 24. Block, 25. Tie. Implementation Method

[0028] The present invention will be further described below with reference to the accompanying drawings and specific embodiments.

[0029] As shown in the embodiments shown in Figures 1, 2 and 3, a waterproof box for outdoor use of a socket includes an upper cover 1 and a lower cover 2. The lower cover 2 includes a bottom cover 3 and a cover ring 4 matching the upper cover 1. The bottom of the bottom cover 3 is away from the cover ring 4, and the open end of the bottom cover 3 is close to the cover ring 4. A surrounding and foldable rubber block 5 is provided on the open end of the bottom cover 3. One end of the rubber block 5 is fixedly connected to the bottom cover 3, and the other end of the rubber block 5 is fixedly connected to one end of the cover ring 4. The other end of the cover ring 4 is detachably connected to the upper cover 1. A sealed waterproof cavity 6 is formed between the upper cover 1, the cover ring 4, the rubber block 5 and the bottom cover 3. The side wall of the waterproof cavity 6 is provided with a plurality of threading holes 7 that cooperate with the cable seal.

[0030] As shown in Figures 1, 2, 5 and 6, the outer diameter of the bottom cover 3 is smaller than the inner diameter of the cover ring 4, and the caliber of the rubber block 5 increases continuously and linearly from the end where it is fixedly connected to the bottom cover 3 to the end where it is fixedly connected to the cover ring 4. One end of the rubber block 5 is provided with a folding edge 8, and the rubber block 5 is fixedly connected to the bottom cover 3 through the folding edge 8. The other end of the rubber block 5 is provided with a folding edge 2 9, and the rubber block 5 is fixedly connected to the cover ring 4 through the folding edge 2 9.

[0031] As shown in FIG. 6 , the vertical height between the first folding edge 8 and the second folding edge 9 is equal to the height of the bottom cover 3 .

[0032] As shown in Figures 3, 4, 6, and 7, the rubber block 5 is fixedly connected to the inner sidewall of one end of the cover ring 4. The other end of the cover ring 4 is provided with an annular sealing groove 10. The edge of the upper cover 1 is provided with an annular sealing groove 2 11 corresponding to the sealing groove 10. The sealing grooves 10 and 11 are both fixedly connected by injection molding with waterproof strips 12. The cover ring 4 is sealed to the upper cover 1 through the interference fit of the waterproof strips 12 in the sealing grooves 10 and 11. The sealing grooves 10 and 11 are both provided with a plurality of threading grooves 13 on both sides. The threading hole 7 is formed by the threading grooves 13 in the sealing groove 10 and the corresponding threading grooves 13 in the sealing groove 2 11. The waterproof strips 12 are made of TPE.

[0033] As shown in Figures 1, 2, 4, 5 and 7, the bottom of the wire threading groove 13 on the outer wall of the sealing groove 10 extends outward to form a protruding semi-arc groove 14. The open end of the wire threading groove 13 is located on the side wall of the open end of the sealing groove 10. A cable tie 15 is fixed to one side of the open end of the semi-arc groove 14 by injection molding. The other side corresponding to the open end of the semi-arc groove 14 is provided with a tie opening 25 matching the tie 15. The tie 15 and the tie opening 25 are both located outside the semi-arc groove 14. The edge of the upper cover 1 is provided with a through groove 16 corresponding to the tie ties 15 on several wire threading grooves 13. The tie 15 is located in the open end of the through groove 16. The wire threading groove 13 on the outer wall of the sealing groove 2 11 corresponds to the semi-arc groove 14 on the outer wall of the sealing groove 10 and runs through both sides of the open end of the through groove 16.

[0034] As shown in Figures 1, 2, 3 and 5, the edge of the cover ring 4 and the edge of the upper cover 1 are provided with a plurality of puncture holes 17, and the puncture holes 17 are located between the sealing groove 2 11 and the through groove 16. The puncture holes 17 on the cover ring 4 correspond to the puncture holes 17 on the upper cover 1 one by one, and the plurality of puncture holes 17 and the plurality of threading holes 7 are spaced apart along the circumference of the cover ring 4. The puncture holes 17 are located on the outside of the waterproof strip 12, and the waterproof cavity 6 is located on the inside of the waterproof strip 12. A support column 18 is provided in the center of the puncture hole 17, and the two ends of the support column 18 are fixedly connected to the two side walls of the puncture hole 17 respectively.

[0035] As shown in FIG4 and FIG7, the inner and outer side walls of the sealing groove 10 are provided with step surfaces 19 that match the opening end of the sealing groove 2 11, and the opening end of the semi-arc groove 14 and the step surface 19 are on the same plane.

[0036] As shown in Figure 4, the waterproof strip 12 is provided with several rectangular cable sealing areas 20 corresponding to the wiring grooves. The length of the cable sealing area 20 is greater than the inner diameter of the wiring groove. The cable sealing area 20 is provided with several deformation grooves 21 evenly distributed along its width direction. The side wall of the deformation groove 21 is provided with an arc-shaped groove 22, and the groove 22 is located in the wiring hole.

[0037] As shown in Figures 1, 2 and 3, the outer edge of the upper cover 1 is provided with several evenly distributed buckles 23, which are located on the side of the threading hole 7 and are rotatably connected to the upper cover 1. Several blocks 24 that match the buckles 23 one by one are fixed on the cover ring 4. The upper cover 1 is detachably connected to the cover ring 4 through several buckles 23 that match several blocks 24 one by one.

[0038] When the waterproof box is in use, the rubber block 5 is in an unfolded state, so that the waterproof cavity 6 can be used to place the socket; when the waterproof box is not in use, the user can squeeze the bottom cover 3 or the upper cover 1, so that the rubber block 5 is folded through the folding edge 1 8 and the folding edge 2 9 and completely enters the space formed by the cover ring 4 and the upper cover 1 for folding, which is convenient for storage and packaging and transportation, thereby achieving the purpose of saving space.

[0039] When in use, the user first opens the upper cover 1 through the buckle 23, places the socket in the waterproof cavity 6, and places the cable on the socket in the corresponding semi-arc groove 14 and aligns it with the notch 22, and then fixes it by fastening the tie 15 with the tie opening 25. Since the length of the tie 15 is adjustable, it can fix cables of different thicknesses, which changes the problem of the single cable specification adapted by the traditional waterproof box and improves practicality. Finally, the buckle 23 is connected with the block 24 to make the upper cover 1 and the lower cover 2 fit tightly. At this time, the waterproof cavity 10 in the sealing groove is The corresponding parts of the water strip 12 and the waterproof strip 12 in the sealing groove 11 are respectively adhered to the upper and lower surfaces of the cable and perform interference fit, thereby achieving a sealing fit between the cable and the threading hole 7; at the same time, since the cover ring 4 is sealed and connected to the upper cover 1 through the interference fit of the waterproof strip 12 in the sealing groove 10 and the waterproof strip 12 in the sealing groove 2 11, the two waterproof strips 12 are squeezed and tightly fitted with each other, so there is a certain sealing and waterproof effect at the idle threading hole 7; and the waterproof strip 12 is connected through the injection molding process, which further improves the waterproof sealing of the waterproof box.

[0040] When the waterproof box is in a humid environment or is used for a long time, you can use a cable tie or a binding strap to pass through the holes on the cover ring 4 and the upper cover 1 and tie it around the support column 18, so that the upper cover 1 and the lower cover 2 fit more tightly, and the two waterproof strips 12 fit tightly together, which is conducive to further improving the waterproof effect.

Claims

1. A waterproof box for outdoor sockets, characterized in that: The invention comprises an upper cover (1) and a lower cover (2), wherein the lower cover (2) comprises a bottom cover (3) and a cover ring (4) matching the upper cover (1), wherein the bottom of the bottom cover (3) is away from the cover ring (4), and the open end of the bottom cover (3) is close to the cover ring (4), and a surrounding and foldable rubber block (5) is provided on the open end of the bottom cover (3), one end of the rubber block (5) is fixedly connected to the bottom cover (3), the other end of the rubber block (5) is fixedly connected to one end of the cover ring (4), and the other end of the cover ring (4) is detachably connected to the upper cover (1), and the upper cover (1), the cover ring (4), the rubber block (5) and the bottom cover (3) together form a sealed waterproof cavity (6), and the side wall of the waterproof cavity (6) is provided with a plurality of threading holes (7) that are sealed and matched with cables.

2. A waterproof box for outdoor socket according to claim 1, characterized in that: The outer diameter of the bottom cover (3) is smaller than the inner diameter of the cover ring (4); the caliber of the rubber block (5) increases continuously and linearly from one end thereof fixedly connected to the bottom cover (3) to the other end thereof fixedly connected to the cover ring (4); one end of the rubber block (5) is provided with a folded edge 1 (8), and the rubber block (5) is fixedly connected to the bottom cover (3) via the folded edge 1 (8); the other end of the rubber block (5) is provided with a folded edge 2 (9), and the rubber block (5) is fixedly connected to the cover ring (4) via the folded edge 2 (9).

3. A waterproof box for outdoor socket according to claim 2, characterized in that: The vertical height between the folded edge 1 (8) and the folded edge 2 (9) is equal to the height of the bottom cover (3).

4. The waterproof box for outdoor socket according to claim 1, characterized in that: The rubber block (5) is fixedly connected to the inner side wall of one end of the cover ring (4); an annular sealing groove (10) is provided on the other end of the cover ring (4); an annular sealing groove (11) corresponding to the sealing groove (10) is provided on the edge of the upper cover (1); a waterproof strip (12) is fixedly connected to the sealing groove (10) and the sealing groove (11) by injection molding; the cover ring (4) is sealedly connected to the upper cover (1) by interference fit of the waterproof strip (12) in the sealing groove (10) and the waterproof strip (12) in the sealing groove (11); a plurality of threading grooves (13) are provided on the inner and outer sides of the sealing groove (10) and the sealing groove (11); the threading hole (7) is composed of the threading groove (13) on the sealing groove (10) and the corresponding threading groove (13) on the sealing groove (11).

5. A waterproof box for outdoor socket according to claim 4, characterized in that: The material used for the waterproof strip (12) is TPE.

6. A waterproof box for outdoor socket according to claim 4, characterized in that: The bottom of the threading groove (13) on the outer wall of the sealing groove (10) extends outward to form a protruding semi-arc groove (14); the open end of the threading groove (13) is located on the side wall of the open end of the sealing groove (10); a cable tie (15) is fixed to one side of the open end of the semi-arc groove (14) by injection molding; the other side corresponding to the open end of the semi-arc groove (14) is provided with a tie opening (25) matching the tie (15); the tie (15) and the tie opening (25) are both located outside the semi-arc groove (14); the edge of the upper cover (1) is provided with through grooves (16) corresponding to the tie (15) on the plurality of threading grooves (13); the tie (15) is located in the open end of the through groove (16); the threading groove (13) on the outer wall of the sealing groove (11) corresponds to the semi-arc groove (14) on the outer wall of the sealing groove (10) and passes through both sides of the open end of the through groove (16).

7. A waterproof box for outdoor socket according to claim 6, characterized in that: The edge of the cover ring (4) and the edge of the upper cover (1) are both provided with a plurality of puncture holes (17), the puncture holes (17) are located between the second sealing groove (11) and the through groove (16), the puncture holes (17) on the cover ring (4) correspond to the puncture holes (17) on the upper cover (1) one by one, the puncture holes (17) and the threading holes (7) are spaced apart along the circumference of the cover ring (4), the puncture holes (17) are located on the outside of the waterproof strip (12), the waterproof cavity (6) is located on the inside of the waterproof strip (12), a support column (18) is provided at the center of the puncture hole (17), and the two ends of the support column (18) are respectively fixedly connected to the two side walls of the puncture hole (17).

8. A waterproof box for outdoor socket according to claim 6 or 7, characterized in that: The inner and outer side walls of the sealing groove 1 (10) are both provided with a step surface (19) matching the opening end of the sealing groove 2 (11), and the opening end of the semi-arc groove (14) and the step surface (19) are on the same plane.

9. The waterproof box for outdoor socket according to claim 4, characterized in that: The waterproof strip (12) is provided with a plurality of rectangular cable sealing areas (20) corresponding to the wiring slots, the length of the cable sealing areas (20) being greater than the inner diameter of the wiring slots, the cable sealing areas (20) being provided with a plurality of deformation grooves (21) evenly distributed along the width direction thereof, the side walls of the deformation grooves (21) being provided with arc-shaped notches (22), and the notches (22) being located in the wiring holes.

10. The waterproof box for outdoor socket according to claim 1, characterized in that: The outer edge of the upper cover (1) is provided with a plurality of evenly distributed buckles (23), the buckles (23) being located on the side of the threading hole (7) and being rotatably connected to the upper cover (1), the cover ring (4) being fixed with a plurality of clamping blocks (24) which match the buckles (23) one by one, and the upper cover (1) being detachably connected to the cover ring (4) by the plurality of buckles (23) matching the plurality of clamping blocks (24) one by one.

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