Rotary pressing rope tying buckle

Abstract

The utility model discloses a rotary pressing rope tying buckle which comprises a fixed base, a mounting seat capable of accommodating a shoelace is arranged at the upper end of the fixed base, a take-up device capable of winding and rotating the shoelace is mounted in the mounting seat, and a fixed shell capable of driving the take-up device to rotate is arranged on the outer side of the take-up device. A triangular upper cover is clamped to the upper end of the fixing shell, the arc-shaped clamping block is in an arc shape, and a rack is arranged at the end of the arc-shaped clamping block. A plurality of clamping teeth on the edge of the rack are matched with an arc-shaped clamping block, so that precisely combined mechanical sound can be generated, the use comfort of a user can be improved, a shoelace can be conveniently wound, the bottom of the shoelace can be fixed in the take-up device through the thread inlet hole, the shoelace can be conveniently wound, and the shoelace take-up device is convenient to use. According to the shoelace winding device, the shoelace can be wound through the arrangement of the thread inlet protrusions, the shoelace can be conveniently used, and the shoelace can be wound more conveniently due to the fact that the number of the thread inlet protrusions is only two.

Description

Technical Field

[0001] The utility model relates to the field of shoe buckles, in particular to a rotary pressing lacing buckle. Background Art

[0002] Shoelaces are ropes used to adjust the tightness of the shoe upper and ensure the comfort of the foot. Shoelaces have always been fastened by cross-knotting the shoelaces, which is very cumbersome. In addition, the shoelaces are often too tight, too loose or loose when walking or exercising, causing a lot of inconvenience.

[0003] At present, in daily life, we have to tie shoelaces every time we wear shoes, and then loosen them when we put on slippers, which is very troublesome and extremely inconvenient to use.

[0004] In view of this, research and improvement are conducted on the existing problems, and a rotary press lace buckle is provided, which has a reasonable structural design. Through the setting of the wire entry hole, the bottom of the shoelaces can be fixed inside the wire reel, which is convenient for winding up the shoelaces. Through the setting of the wire entry protrusion, the shoelaces can be wound up, which is convenient for use. Moreover, there are only two wire entry protrusions, which can make it more convenient to wind up the shoelaces, thereby achieving the purpose of solving the problem and improving the practical value. Utility Model Content

[0005] The utility model aims to solve the shortcomings of the prior art and proposes a rotary pressing tether buckle.

[0006] In order to achieve the above-mentioned purpose, the utility model adopts the following technical scheme: a rotating and pressing lace buckle, comprising a fixed base, the upper end of the fixed base is provided with a mounting seat capable of storing shoelaces, a wire take-up device capable of winding and rotating the shoelaces is installed inside the mounting seat, a fixed shell capable of driving the wire take-up to rotate is provided on the outer side of the wire take-up device, and a triangular upper cover is clamped on the upper end of the fixed shell.

[0007] As a further description of the above technical solution:

[0008] The fixed base includes a notch, a groove S, a protrusion S, a buckle groove A and a buckle groove B. The notch is opened on the outer wall of the fixed base. The fixed base is fixedly installed on the shoe upper. Shoelaces are inserted into the interior of the fixed base. The protrusion S is integrally connected to the upper surface of the fixed base. The groove S is opened inside the protrusion S. The number of the grooves S is two. The buckle groove A and the buckle groove B are opened at the bottom of the fixed base. The buckle groove A and the buckle groove B are connected.

[0009] As a further description of the above technical solution:

[0010] The mounting seat comprises a rack edge, a wire entry protrusion, a buckle B and a buckle A, the mounting seat is clamped inside the fixed base through the buckle B and the buckle A, the buckle B and the buckle A are integrally connected to the bottom of the mounting seat, and the size of the buckle B is adapted to the size of the buckle slot B;

[0011] The buckle B is engaged with the buckle slot B, the size of the buckle A is compatible with the size of the buckle slot A, the buckle A is engaged with the buckle slot A, the wire feeder protrusion is integrally connected to the outer wall of the mounting seat, the number of the wire feeder protrusions is two, the wire feeder protrusions are installed inside the groove S, and the rack edge is integrally connected to the inner wall of the mounting seat.

[0012] The rack edge is meshed with the gear on the wire take-up device, so that when the wire take-up device rotates, the rack edge can drive the mounting seat to rotate together, thereby realizing automatic winding and storage of the shoelaces. The rotating upper cover includes a cover body, a torsion spring and anti-slip grooves.

[0013] When in use, the user only needs to pass the shoelaces through the fixed base and the mounting seat, and then rotate the wire take-up device to achieve automatic winding and storage of the shoelaces.

[0014] As a further description of the above technical solution:

[0015] The wire take-up device includes a central cylinder, a convex tooth block and a wire entry hole. The wire take-up device is rotatably connected to the inside of the mounting base. The central cylinder is fixedly connected to the top of the wire take-up device. The convex tooth block is integrally connected to the surface of the central cylinder. There are two convex tooth blocks. The wire entry holes are opened on the outer wall of the wire take-up device and are arranged opposite to each other. The wire entry holes are divided into two groups, and each group has four holes.

[0016] By setting the wire entry hole, the bottom of the shoelaces can be fixed inside the wire reel, which makes it convenient to reel in the shoelaces. By setting the wire entry protrusion, the shoelaces can be reeled in, which makes it convenient to use. Moreover, there are only two wire entry protrusions, which makes it more convenient to reel in the shoelaces.

[0017] As a further description of the above technical solution:

[0018] The fixed shell includes a snap-on notch, an arc groove M, a central groove, a concave tooth block, a fixed clamping edge and an arc clamping block. The fixed shell is snap-on to the top of the wire take-up device through the central groove. The central groove is opened in the middle of the fixed shell. The size of the central groove is adapted to the size of the central cylinder. The central cylinder is arranged inside the central groove.

[0019] The snap-in notch is provided on the outer wall of the fixed shell, and the number of the snap-in notches is three. The arc groove M is provided on the upper surface of the fixed shell, and the number of the arc groove M is three. The concave tooth block is integrally connected to the inner wall of the fixed shell, and the concave tooth block is meshed with the convex tooth block. The fixed clamping edge is fixedly connected to the bottom of the inner wall of the fixed shell, and the number of the fixed clamping edges is three. The fixed clamping edge is clamped on the outer side of the mounting seat, and the arc clamping block is integrally connected to one end of the concave tooth block, and the arc clamping block is meshed with the rack edge. The shape of the arc clamping block is arc-shaped, and a rack is provided at the end. The combination of the teeth of the rack edge and the arc clamping block can produce a precisely combined mechanical sound, which can not only improve the user's comfort, but also make it very convenient to reel up the shoelaces.

[0020] As a further description of the above technical solution:

[0021] The triangular upper cover includes a limiting plug-in block and a snap-on buckle block, the triangular upper cover is snapped to the outer side of the fixed shell through the limiting plug-in block and the snap-on buckle block, the snap-on buckle block is integrally connected to the inner wall of the limiting plug-in block, the number of the limiting plug-in block and the snap-on buckle block are both three, the limiting plug-in block is fixedly connected to the bottom of the triangular upper cover, the limiting plug-in block is snapped to the inside of the snap-on slot, and the size of the limiting plug-in block is adapted to the size of the snap-on slot.

[0022] The utility model has the following beneficial effects:

[0023] The utility model realizes the convenient storage and adjustment of shoelaces through a series of unique designs, which greatly improves the wearing experience of users.

[0024] Specifically, the setting of the fixed base ensures that the entire device can be stably fixed on the shoe surface, and the structures such as the notch and groove S opened inside it provide convenience for the insertion and storage of shoelaces. At the same time, the design of the buckle groove A and the buckle groove B allows the mounting seat to be easily snapped onto the fixed base, thereby realizing the rapid assembly and disassembly of the device.

[0025] The design of the mounting seat is ingenious, and the setting of the rack edge allows the fixed shell to engage with it, thereby achieving rotational fixation. The structure of the wire inlet protrusion ensures that the shoelaces can smoothly enter the wire take-up device for storage. The wire take-up device, as the core component of the device, achieves rotational movement through the engagement of the convex tooth block and the concave tooth block. The setting of the wire inlet hole allows the shoelaces to enter and wrap around the wire take-up device in an orderly manner, thereby achieving the storage of the shoelaces.

[0026] The design of the fixed shell not only fixes the wire take-up device, but also ensures the stable rotation of the wire take-up device through the meshing of the arc-shaped card block and the edge of the rack. At the same time, the setting of the triangular upper cover not only beautifies the appearance of the entire device, but also ensures the stability of the device through the card connection between the limit plug-in block and the card buckle block and the fixed shell.

[0027] The beneficial effect of the utility model is that the user can conveniently adjust the tightness of the shoelaces by rotating and pressing the lace buckle, avoiding the cumbersomeness and inconvenience of the traditional shoelace adjustment method. At the same time, the device has a simple structure and is easy to operate, and is suitable for wide promotion and use. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 This is a schematic diagram of the overall structure of the rotary pressing tether buckle proposed by the utility model;

[0029] Figure 2 This is an exploded view of the rotary push-on tether buckle proposed in the utility model;

[0030] Figure 3 This is a three-dimensional diagram of the rotary pressing tether buckle proposed by the utility model.

[0031] Legend:

[0032] 1. Fixed base; 2. Mounting seat; 3. Wire take-up device; 4. Fixed shell; 5. Triangular upper cover; 11. Notch; 12. Groove S; 13. Protrusion S; 14. Buckle groove A; 15. Buckle groove B; 21. Rack edge; 22. Wire inlet protrusion; 23. Buckle B; 24. Buckle A; 31. Center cylinder; 32. Protruding tooth block; 33. Wire inlet hole; 41. Snap-on notch; 42. Arc groove M; 43. Center groove; 44. Concave tooth block; 45. Fixed card edge; 46. Arc card block; 51. Limit plug-in block; 52. Snap-on buckle block. DETAILED DESCRIPTION

[0033] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0034] In the description of the present utility model, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inside", "outside" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the drawings, which are only for the convenience of describing the present utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific position, be constructed and operated in a specific position, and therefore cannot be understood as a limitation on the present utility model; the terms "first", "second" and "third" are only used for descriptive purposes, and cannot be understood as indicating or implying relative importance. In addition, unless otherwise clearly specified and limited, the terms "installed", "connected" and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be an indirect connection through an intermediate medium, or it can be the internal connection of two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances.

[0035] Reference Figure 1-3 The utility model provides an embodiment: a rotary pressing lace buckle, comprising a fixed base 1, the upper end of the fixed base 1 is provided with a mounting seat 2 capable of storing shoelaces, the interior of the mounting seat 2 is provided with a wire take-up device 3 capable of winding and rotating the shoelaces, the outer side of the wire take-up device 3 is provided with a fixed shell 4 capable of driving the wire take-up device 3 to rotate, and the upper end of the fixed shell 4 is clamped with a triangular upper cover 5.

[0036] In the utility model, the fixed base 1 includes a notch 11, a groove S12, a protrusion S13, a buckle groove A14 and a buckle groove B15, the notch 11 is provided on the outer wall of the fixed base 1, the fixed base 1 is fixedly mounted on the vamp, the interior of the fixed base 1 is interspersed with shoelaces, the protrusion S13 is integrally connected to the upper surface of the fixed base 1, the groove S12 is provided inside the protrusion S13, the number of the grooves S12 is two, the buckle groove A14 and the buckle groove B15 are provided at the bottom of the fixed base 1, the buckle groove A14 and the buckle groove B15 are connected, and the connection design of the buckle groove A14 and the buckle groove B15 provides great convenience for the fixing of the shoelaces. Through this design, the shoelaces can easily shuttle between the buckle groove A14 and the buckle groove B15, realizing fast and firm binding. At the same time, this connection structure also makes it easier to adjust the shoelaces, and the user can adjust the tightness of the shoelaces at any time according to personal comfort requirements.

[0037] Further, the mounting seat 2 includes a rack edge 21, a wire entry protrusion 22, a buckle B23 and a buckle A24, and the mounting seat 2 is clamped inside the fixed base 1 through the buckle B23 and the buckle A24, and the buckle B23 and the buckle A24 are integrally connected to the bottom of the mounting seat 2, and the size of the buckle B23 is adapted to the size of the buckle groove B15;

[0038] The buckle B23 is engaged with the buckle groove B15, the size of the buckle A24 is matched with the size of the buckle groove A14, the buckle A24 is engaged with the buckle groove A14, the line feed protrusion 22 is integrally connected to the outer wall of the mounting seat 2, the number of the line feed protrusion 22 is two, the line feed protrusion 22 is installed inside the groove S12, the rack edge 21 is integrally connected to the inner wall of the mounting seat 2, the rack edge 21 has a regular tooth structure, can perfectly cooperate with the gear mechanism, and realize accurate rotation and positioning functions. The material of the rack edge 21 is selected to be made of wear-resistant and corrosion-resistant materials to improve service life and stability.

[0039] In addition to the buckle B23 and the buckle A24, the bottom of the mounting base 2 is also designed with anti-skid patterns to increase the friction between the mounting base 2 and the fixed base 1 to prevent sliding or loosening during installation or use. This anti-skid design not only improves the stability of the overall structure, but also increases the safety of use.

[0040] Furthermore, the cable take-up device 3 includes a central cylinder 31, a convex tooth block 32 and a wire entry hole 33. The cable take-up device 3 is rotatably connected to the inside of the mounting base 2. The central cylinder 31 is fixedly connected to the top of the cable take-up device 3. The convex tooth block 32 is integrally connected to the surface of the central cylinder 31. The number of the convex tooth blocks 32 is two. The wire entry holes 33 are opened on the outer wall of the cable take-up device 3 and are arranged relatively. The wire entry holes 33 are in two groups, each group has four holes, and each group of wire entry holes 33 is evenly distributed on the outer wall of the cable take-up device 3, so that the cables can be evenly stored and fixed. The central cylinder 31, as the core part of the cable take-up device 3, plays a supporting and stabilizing role, so that the entire cable take-up device can rotate smoothly. The presence of the convex tooth block 32 increases the friction between the cable take-up device 3 and the cable, so that the cable can be more firmly fixed on the cable take-up device and is not easy to fall off.

[0041] During use, the user can pass one end of the cable through the cable entry hole 33, then bypass the convex tooth block 32, and pass the other end of the cable through the cable entry hole 33 on the other side again, so as to fix the cable on the cable take-up device 3. As the cable is wound, the cable take-up device 3 can rotate freely inside the mounting base 2, which is convenient for the user to store and organize the cables.

[0042] Further, the fixed shell 4 includes a snap-fit ​​notch 41, an arc groove 542, a central groove 43, a concave tooth block 44, a fixed clamping edge 45 and an arc clamping block 46. The fixed shell 4 is snap-fitted to the top of the wire take-up device 3 through the central groove 43. The central groove 43 is opened in the middle of the fixed shell 4. The size of the central groove 43 is adapted to the size of the central cylinder 31. The central cylinder 31 is arranged inside the central groove 43.

[0043] This rotating press lace buckle design is not only convenient and practical, but also stylish and generous in appearance, and can be used with various styles of shoes. Whether it is sports shoes, casual shoes or leather shoes, it can show a unique personality and taste.

[0044] The engaging notch 41 is provided on the outer wall of the fixed shell 4, and the number of the engaging notches 41 is three. The arc groove M42 is provided on the upper surface of the fixed shell 4, and the number of the arc groove M42 is three. The concave tooth block 44 is integrally connected to the inner wall of the fixed shell 4, and the concave tooth block 44 is meshed with the convex tooth block 32. The fixed card edge 45 is fixedly connected to the bottom of the inner wall of the fixed shell 4, and the number of the fixed card edges 45 is three. The fixed card edge 45 is clamped on the outer side of the mounting seat 2, and the arc block 46 is integrally connected to one end of the concave tooth block 44. The arc block 46 is meshed with the rack edge 21. The shape of the arc block 46 is arc-shaped, and a rack is provided at the end. The rack of the arc block 46 and the rack of the rack edge 21 are meshed with each other, so that the fixing of the fixed shell 4 on the mounting seat 2 is more stable and reliable. In addition, the inner wall of the fixed shell 4 is provided with anti-slip patterns to increase the friction between the fixed shell 4 and the wire take-up device 3, further improving the stability of the connection. The material of the fixed shell 4 is selected from high-strength engineering plastics, which not only ensures sufficient structural strength, but also reduces the overall weight, making the entire device more lightweight and portable.

[0045] Specifically, when in use, the user only needs to place the wire take-up device 3 in the central groove 43 of the fixed shell 4, and then clamp the fixed clamping edge 45 of the fixed shell 4 on the outer side of the mounting seat 2 to complete the assembly of the entire device. At this time, the concave tooth block 44 of the fixed shell 4 is meshed with the convex tooth block 32 of the wire take-up device 3, and the arc-shaped clamping block 46 is meshed with the rack edge 21 of the mounting seat 2, so as to achieve multiple fixation and ensure that the device will not loosen or fall off during use.

[0046] Furthermore, the triangular upper cover 5 includes a limiting plug-in block 51 and a snap-on buckle block 52, and the triangular upper cover 5 is snapped onto the outer side of the fixed shell 4 through the limiting plug-in block 51 and the snap-on buckle block 52, and the snap-on buckle block 52 is integrally connected to the inner wall of the limiting plug-in block 51, and the number of the limiting plug-in block 51 and the snap-on buckle block 52 are both three, and the limiting plug-in block 51 is fixedly connected to the bottom of the triangular upper cover 5, and the limiting plug-in block 51 is snapped into the inside of the snap-on slot 41, and the size of the limiting plug-in block 51 is adapted to the size of the snap-on slot 41.

[0047] In addition, the material of the triangular upper cover 5 is carefully selected to ensure sufficient strength and aesthetics. Its surface is specially treated to have excellent wear resistance and corrosion resistance, and can maintain its original appearance and performance for a long time.

[0048] Working principle and usage process: The utility model installs a shoelace storage device on the upper of the shoe, which mainly includes a fixed base, a mounting seat, a wire collector, a fixed shell, a triangular upper cover and other components. The device can conveniently store shoelaces to avoid interference of shoelaces during walking, and also improves the overall aesthetics of the shoes.

[0049] When in use, first pass the shoelace through the notch on the fixed base and let it pass out from the bottom of the fixed base. Then, snap the mounting base into the inside of the fixed base, and snap the buckle B and buckle A into the buckle groove B and buckle groove A at the bottom of the fixed base to ensure that the mounting base is firmly fixed. At this time, the two ends of the shoelace will pass through the wire entry protrusions on the mounting base respectively and be fixed inside the mounting base.

[0050] Next, rotate the wire take-up device and install it inside the mounting seat, so that the convex tooth block is meshed with the concave tooth block. Then, clamp the fixed shell on the top of the wire take-up device, insert the center cylinder into the center groove, clamp the fixed card edge on the outside of the mounting seat, and mesh the arc-shaped card block with the rack edge. At this time, the arc-shaped groove of the fixed shell matches the rack edge of the mounting seat, so that the fixed shell can be stably rotated on the top of the wire take-up device.

[0051] Finally, the triangular upper cover is clamped to the outer side of the fixed shell through the limit plug-in block and the clamping buckle block to complete the assembly of the entire device. During use, the shoelaces can be wound and stored through the wire take-up device by simply rotating the fixed shell, which is convenient and quick.

[0052] The utility model realizes the rapid storage and fixation of shoelaces through reasonable structural design and assembly method, and improves the practicality and aesthetics of shoes. At the same time, the device has a simple structure and is easy to operate, suitable for various shoe styles, and brings convenience to people's daily life.

[0053] Finally, it should be noted that the above is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art can still modify the technical solutions described in the aforementioned embodiments or make equivalent substitutions for some of the technical features therein. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A rotary push-pull tether buckle, comprising a fixed base (1), characterized in that: The upper end of the fixed base (1) is provided with a mounting seat (2) capable of storing shoelaces, a wire take-up device (3) capable of winding and rotating the shoelaces is installed inside the mounting seat (2), a fixed shell (4) capable of driving the wire take-up device (3) to rotate is provided outside the wire take-up device (3), and a triangular upper cover (5) is clamped on the upper end of the fixed shell (4).

2. The rotary push cord buckle according to claim 1, characterized in that: The fixed base (1) comprises a notch (11), a groove S (12), a protrusion S (13), a buckle groove A (14) and a buckle groove B (15); the notch (11) is arranged on the outer wall of the fixed base (1); the fixed base (1) is fixedly mounted on the shoe upper; a shoelace is inserted into the interior of the fixed base (1); the protrusion S (13) is integrally connected to the upper surface of the fixed base (1); the groove S (12) is arranged inside the protrusion S (13); the number of the grooves S (12) is two; the buckle groove A (14) and the buckle groove B (15) are arranged at the bottom of the fixed base (1); the buckle groove A (14) and the buckle groove B (15) are connected.

3. The rotary push cord buckle according to claim 1, characterized in that: The mounting seat (2) comprises a rack edge (21), a wire entry protrusion (22), a buckle B (23) and a buckle A (24); the mounting seat (2) is buckled inside the fixed base (1) through the buckle B (23) and the buckle A (24); the buckle B (23) and the buckle A (24) are integrally connected to the bottom of the mounting seat (2); the size of the buckle B (23) is adapted to the size of the buckle slot B (15); The buckle B (23) is engaged with the buckle groove B (15), the size of the buckle A (24) is matched with the size of the buckle groove A (14), the buckle A (24) is engaged with the buckle groove A (14), the wire feed protrusion (22) is integrally connected to the outer wall of the mounting seat (2), the number of the wire feed protrusions (22) is two, the wire feed protrusions (22) are installed inside the groove S (12), and the rack edge (21) is integrally connected to the inner wall of the mounting seat (2).

4. The rotary push cord buckle according to claim 1, characterized in that: The wire take-up device (3) comprises a central cylinder (31), a convex tooth block (32) and a wire entry hole (33); the wire take-up device (3) is rotatably connected to the inside of the mounting base (2); the central cylinder (31) is fixedly connected to the top of the wire take-up device (3); the convex tooth block (32) is integrally connected to the surface of the central cylinder (31); the number of the convex tooth blocks (32) is two; the wire entry holes (33) are opened on the outer wall of the wire take-up device (3) and are arranged opposite to each other; the wire entry holes (33) are in two groups, each group having four holes.

5. The rotary push cord buckle according to claim 1, characterized in that: The fixed shell (4) comprises a snap-fit ​​notch (41), an arc-shaped groove M (42), a central groove (43), a concave tooth block (44), a fixed clamping edge (45) and an arc-shaped clamping block (46); the fixed shell (4) is snap-fitted to the top of the wire take-up device (3) via the central groove (43); the central groove (43) is provided in the middle of the fixed shell (4); the size of the central groove (43) matches the size of the central cylinder (31); the central cylinder (31) is arranged inside the central groove (43); The engaging notch (41) is provided on the outer wall of the fixed shell (4), and the number of the engaging notches (41) is three. The arc-shaped grooves M (42) are provided on the upper surface of the fixed shell (4), and the number of the arc-shaped grooves M (42) is three. The concave tooth block (44) is integrally connected to the inner wall of the fixed shell (4), and the concave tooth block (44) is meshedly connected with the convex tooth block (32). The fixed clamping edge (45) is fixedly connected to the bottom of the inner wall of the fixed shell (4), and the number of the fixed clamping edges (45) is three. The fixed clamping edge (45) is clamped to the outer side of the mounting seat (2). The arc-shaped clamping block (46) is integrally connected to one end of the concave tooth block (44), and the arc-shaped clamping block (46) is meshedly connected with the rack edge (21). The arc-shaped clamping block (46) is in an arc shape, and a rack is provided at the end.

6. The rotary push cord buckle according to claim 1, characterized in that: The triangular upper cover (5) comprises a limiting plug-in block (51) and a snap-on buckle block (52); the triangular upper cover (5) is snap-on to the outer side of the fixed shell (4) via the limiting plug-in block (51) and the snap-on buckle block (52); the snap-on buckle block (52) is integrally connected to the inner wall of the limiting plug-in block (51); the limiting plug-in block (51) and the snap-on buckle block (52) are both three in number; the limiting plug-in block (51) is fixedly connected to the bottom of the triangular upper cover (5); the limiting plug-in block (51) is snap-on to the inside of the snap-on slot (41); the size of the limiting plug-in block (51) is adapted to the size of the snap-on slot (41).

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