Stainless steel profile composition board

Abstract

The utility model relates to the technical field of door plates, in particular to a stainless steel section composite plate which comprises a plurality of plugs, a first panel, a second panel, a first frame, a second frame, a third frame and a fourth frame, the first panel and the second panel are arranged in parallel, and the first frame, the second frame, the third frame and the fourth frame are sequentially arranged between the first panel and the second panel to form a closed cavity. The first panel and the second panel are of stainless steel structures. The plugs are used for connecting the first frame, the second frame, the third frame and the fourth frame to form a whole. The plug comprises a connecting plate and a connecting block, and the connecting plate and the connecting block are arranged in a T shape. One side of the connecting plate is fixedly connected with one end of the connecting block, the connecting block is inserted into the corresponding end of the first frame or the third frame, the connecting plate is in threaded connection with the inner side face of one end of the corresponding second frame or the fourth frame, and the plugs are all located in the cavity. The plate is easy to process, convenient to mount and dismount, higher in efficiency and convenient to carry and transport, and the plug is wrapped in the closed cavity, so that the attractiveness is better.

Description

TECHNICAL FIELD

[0001] The utility model relates to door panel technical field especially stainless steel section bar combined board. BACKGROUND

[0002] The whole cabinet has entered ten thousand families, and has brought many conveniences for people's daily life, the plate of whole cabinet is stainless steel or aluminum alloy material, especially the frame and the plate part are made of stainless material. The plate used in the existing stainless steel cabinet is formed by using profile bending to form a frame and sealing a stainless steel panel, or by filling a honeycomb core after bending the stainless steel panel and then sealing the panel. The plate processing is relatively complex, and is prone to deformation during transportation, and the assembly processing efficiency is low. SUMMARY

[0003] In order to solve the technical defects in the background art, the utility model aims to provide a stainless steel section bar combined board.

[0004] In order to achieve the above purpose, the utility model adopts the following technical scheme:

[0005] The stainless steel section bar combined board comprises a plurality of plugs, a first panel and a second panel arranged in parallel, a first frame, a second frame, a third frame and a fourth frame arranged between the first panel and the second panel to form a closed cavity, wherein the first panel and the second panel are arranged in a stainless steel structure; the plugs are used to connect the first frame, the second frame, the third frame and the fourth frame to form a whole; the plug comprises a connecting plate and a connecting block, and the connecting plate and the connecting block are arranged in a T shape; one side of the connecting plate is fixedly connected with one end of the connecting block, the connecting block is inserted into a corresponding end of the first frame or the third frame, and the connecting plate is screw-connected with the inner side of a corresponding end of the second frame or the fourth frame; and the plugs are located in the cavity.

[0006] By adopting the above technical scheme, the first panel, the second panel, the first frame, the second frame, the third frame and the fourth frame form a closed cavity, and two adjacent frames are connected by the plug. The connecting block is inserted into the first frame or the third frame, the connecting plate is screw-connected with the corresponding second frame or the fourth frame, the first panel and the second panel are fixedly connected with the four frames, the plate processing is simple, the installation and disassembly are convenient, the efficiency is higher, and the plate is convenient to carry and transport. The plug is wrapped in the closed cavity, and the appearance is better.

[0007] Further, the connecting block is provided with at least one first screw hole along the length direction of the connecting block, and the central axis of the first screw hole is perpendicular to the length direction of the connecting block. The corresponding end of the first frame and the third frame is provided with a second screw hole, the first screw hole and the second screw hole are arranged in a staggered manner along the central axis direction, and the projection part along the central axis direction of the first screw hole and the second screw hole overlaps, which facilitates the pre-installation of the connecting block and the first frame, and the two are assembled more firmly through the threaded connection of the first screw hole and the second screw hole.

[0008] Further, the plug is provided with a through adjusting groove along the length direction of the connecting block. One end of the adjusting groove is located at the end of the connecting block away from the connecting plate, and the other end of the adjusting groove is located at the side of the connecting plate away from the connecting block, and the adjusting groove is arranged in communication with the first screw hole. The adjusting groove is connected with the adjusting groove on the adjacent other stainless steel profile combined plate through the adjusting screw to fix two groups of stainless steel profile combined plates, which facilitates the assembly of the two groups of stainless steel profile combined plates more closely, has higher stability, and prevents the phenomenon of shaking.

[0009] Further, the outer side end of the connecting plate is provided with a closing block, the side surface of the one end of the closing block connected with the connecting plate is flush with the inner side surface of the connecting plate, and the end of the one end of the closing block is sealingly connected with the end surface of the corresponding first frame and third frame. The other end of the closing block protrudes from the connecting plate, and the side surface of the other end of the closing block is flush and sealingly connected with the outer side surface of the corresponding second frame or fourth frame, which facilitates the assembly and flattening of the two adjacent frames, improves the assembly efficiency, sealing performance and aesthetic appearance.

[0010] Further, the closing block is provided with an L-shaped sealing strip protruding at both ends along the length direction of the closing block, and the sealing strip is sealingly connected with the turning angle of the corresponding first panel and second panel. The thickness of the sealing strip is equal to the thickness of the first panel and the second panel, which facilitates the assembly and flattening of the first panel and the second panel, and improves the assembly efficiency and aesthetic appearance.

[0011] Further, the plug further comprises a limiting block, one end of the limiting block is fixedly connected with the inner side wall of the connecting plate. The inner side of the first frame and the third frame is provided with a limiting groove along the length direction, and the other end of the limiting block is inserted into the corresponding limiting groove, which improves the bearing strength of the connection and the stability of the preliminary installation.

[0012] Furthermore, the stainless steel profile composite panel also includes at least one set of light source components, each comprising a light strip and a power cord. At least one light groove is provided on the side of the first or third frame along its thickness direction, and the light groove is provided along the length direction of the first or third frame. The first panel and the second panel each have through-holes relative to the light groove. The light strip is installed within the light groove, and the connecting plate has a wire outlet hole relative to the light groove. A wiring groove is provided at a corresponding position on the second or fourth frame. The light groove, the wire outlet hole, and the wiring groove are interconnected. One end of the power cord is electrically connected to the light strip, and the other end of the power cord passes sequentially through the light groove, the wire outlet hole, and the wiring groove to connect to an external power supply structure. This design improves the compatibility of the stainless steel profile composite panel, resulting in a compact structure and convenient installation and disassembly.

[0013] Furthermore, the wiring channel is located outside the second or fourth frame and is arranged along its length, with its outer side open. The opening width of the open side of the wiring channel is smaller than the width of the bottom of the channel, which facilitates the laying and fixing of the power cord and the maintenance of the light source assembly, making installation and disassembly more convenient.

[0014] Furthermore, the stainless steel profile composite panel also includes multiple filler plates, which are spaced apart in the cavity. One side of each filler plate is glued to the first panel, and the other side of each filler plate is glued to the second panel, which facilitates installation and improves support strength.

[0015] Furthermore, mounting grooves are provided on both sides of the first frame away from the third frame, and these mounting grooves are used to install the back plate structure. The end cap is provided with a clearance opening corresponding to the end of the mounting groove, improving assembly efficiency and the stability of the overall structure.

[0016] In summary, the beneficial effects of this utility model are as follows:

[0017] This utility model uses a first panel, a second panel, a first frame, a second frame, a third frame, and a fourth frame to form a closed chamber. Adjacent frames are connected by plugs. A connecting block is inserted into the first or third frame, and a connecting plate is threaded to the corresponding second or fourth frame. Both the first and second panels are fixedly connected to the four frames. The material processing is simple, installation and disassembly are convenient, efficiency is higher, and it is also easy to carry and transport. The plugs are wrapped inside the closed chamber, resulting in better aesthetics. Attached Figure Description

[0018] Figure 1 This is a structural schematic diagram of one embodiment of the strapping machine of this utility model.

[0019] Figure 2 is Figure 1 is an enlarged schematic view of the structure A.

[0020] Figure 3 is Figure 1 is an enlarged schematic view of the structure B.

[0021] Figure 4 is an exploded structural schematic view of an embodiment of the stainless steel profile combined board.

[0022] Figure 5 is an enlarged structural schematic view of an embodiment of the connection between the plug and the first frame of the banding machine.

[0023] Figure 6 is an enlarged structural schematic view of an embodiment of the connection between the plug and the third frame of the banding machine.

[0024] Figure 7 is an enlarged structural schematic view of an embodiment of the connection between the plug and the second frame of the banding machine.

[0025] Figure 8 is a structural schematic view of the internal structure of the banding machine.

[0026] Explanation of reference numerals in the drawings:

[0027] 1, stainless steel profile combined board; 2, plug; 21, connecting plate; 211, wire outlet hole; 22, connecting block; 221, first screw hole; 23, adjusting groove; 24, closing block; 25, sealing strip; 26, limiting block; 27, fixed column; 28, third screw hole; 3, first panel; 4, second panel; 5, first frame; 51, mounting groove; 6, second frame; 7, third frame; 8, fourth frame; 9, light source assembly; 91, lamp strip; 92, power cord; 10, lamp groove; 11, wiring groove; 12, fixing groove; 13, second screw hole; 14, limiting groove; 15, filling plate; 16, double-sided adhesive. DETAILED DESCRIPTION

[0028] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art belong to the scope of protection of the present application.

[0029] Those skilled in the art should understand that in the disclosure of the utility model, the orientation or positional relationship indicated by the terms "longitudinal", "transverse", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer" and the like is based on the orientation or positional relationship shown in the drawings, which is only for the convenience of describing the utility model and simplifying the description, and does not indicate or imply that the device or element indicated must have a particular orientation, be constructed and operated in a particular orientation, therefore the above terms cannot be understood as a limitation on the utility model.

[0030] In the description of the utility model, if there is a word such as "several" description, its meaning is one or more, the meaning of multiple is two and more, greater than, less than, more than and the like are not included in the number, above, below, within and the like are understood as including the number. If the first, second, third is described, it is only used for the purpose of distinguishing technical features, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of indicated technical features or implicitly indicating the sequence of indicated technical features.

[0031] The following will be described in detail in combination with the accompanying drawings Figures 1-8 The embodiment of the utility model is further described in detail.

[0032] The stainless steel profile combination plate 1, as shown in Figure 1 、 Figure 2 、 Figure 3 、 Figure 4 It includes a plurality of plugs 2, a first panel 3, a second panel 4 and a first frame 5, a second frame 6, a third frame 7 and a fourth frame 8 arranged between the first panel 3 and the second panel 4 to form a closed chamber. The first panel 3 and the second panel 4 are arranged as stainless steel structure. A plurality of plugs 2 are used to connect the first frame 5, the second frame 6, the third frame 7 and the fourth frame 8 to form a whole. The plug 2 includes a connecting plate 21 and a connecting block 22, and the connecting plate 21 and the connecting block 22 are arranged in T shape. One side of the connecting plate 21 is fixedly connected with one end of the connecting block 22, the connecting block 22 is inserted into the corresponding end of the first frame 5 or the third frame 7, the connecting plate 21 is screw connected with the inner side of the corresponding end of the second frame 6 or the fourth frame 8, and the plurality of plugs 2 are located in the chamber.

[0033] The first panel 3, the second panel 4, the first frame 5, the second frame 6, the third frame 7 and the fourth frame 8 enclose a closed chamber, and two adjacent frames are connected by the plug 2. The connecting block 22 is inserted into the first frame 5 or the third frame 7, and the connecting plate 21 is screwed with the corresponding second frame 6 or fourth frame 8. The first panel 3 and the second panel 4 are fixedly connected to the four frames. The plate processing is simple, the installation and disassembly are convenient, the efficiency is higher, and the transportation is convenient. The plug 2 is wrapped in the closed chamber, and the appearance is better.

[0034] In the embodiment, please refer to Figure 5 The connecting block 22 is provided with at least one first screw hole 221 along the length direction of the connecting block 22. The central axis of the first screw hole 221 is perpendicular to the length direction of the connecting block 22. The first frame 5 and the third frame 7 are provided with a second screw hole 13 at one end. The first screw hole 221 and the second screw hole 13 are arranged in the direction of the central axis and the projection part in the direction of the central axis overlaps, which facilitates the pre-installation of the connecting block 22 and the first frame 5. The two are assembled more firmly by screwing the first screw hole 221 and the second screw hole 13, and the structure is more stable.

[0035] Preferably, the plug 2 is provided with a through adjusting groove 23 along the length direction of the connecting block 22. One end of the adjusting groove 23 is located at the end of the connecting block 22 away from the connecting plate 21, and the other end of the adjusting groove 23 is located at the side of the connecting plate 21 away from the connecting block 22. The adjusting groove 23 is in communication with the first screw hole 221. The adjusting groove 23 is connected with the adjusting groove 23 on the other stainless steel profile combined plate 1 through the adjusting screw to fix the two groups of stainless steel profile combined plates 1, which facilitates the assembly of the two groups of stainless steel profile combined plates 1 to be more closely and stably, and prevents the phenomenon of shaking.

[0036] The other end of the adjusting screw is located in the adjusting groove 23 on the other stainless steel profile combined plate 1. The screw is screwed into the second screw hole 13 on the other stainless steel profile combined plate 1, and the screw is abutted in the adjusting groove at the other end of the adjusting screw after passing through the first screw hole 221. With the depth of the screw, the adjusting screw is moved, and the two groups of stainless steel profile combined plates 1 are pulled close to each other to be connected more closely. The adjusting screw is not shown in the figure.

[0037] Please refer to Figure 5 , Figure 6 , Figure 7In order to improve the efficiency of the flush connection of the plates during installation, a closing block 24 is arranged at the outer end of the connecting plate 21. The side of the connecting block 24 at the end connected to the connecting plate 21 is flush with the inner side of the connecting plate 21, and the end of the connecting block 24 is sealingly connected to the end face of the corresponding first frame 5 and third frame 7. The other end of the closing block 24 protrudes from the connecting plate 21, and the side of the other end of the closing block 24 is flush and sealingly connected to the outer side of the corresponding second frame 6 or fourth frame 8, facilitating assembly and flattening of the two adjacent frames, improving assembly efficiency, sealing performance, and aesthetics.

[0038] Preferably, the closing block 24 is provided with an L-shaped sealing strip 25 at both ends along its length direction, and the sealing strip 25 is sealingly connected to the corner of the corresponding first panel 3 and second panel 4. The thickness of the sealing strip 25 is equal to the thickness of the first panel 3 and second panel 4, facilitating assembly and flattening of the first panel 3 and second panel 4, and improving assembly efficiency and aesthetics.

[0039] In order to improve the initial installation efficiency and the stability of the connection, the plug 2 further comprises a limiting block 26, one end of which is fixedly connected to the inner side wall of the connecting plate 21. The inner side of the first frame 5 and third frame 7 is provided with a limiting groove 14 along its length direction, and the other end of the limiting block 26 is inserted into the corresponding limiting groove 14, improving the bearing strength of the connection and the stability of the initial installation.

[0040] In some embodiments, please refer to Figure 1 、 Figure 2 、 Figure 3 The stainless steel profile combination plate 1 further comprises at least one set of light source assembly 9, which comprises a lamp strip 91 and a power line 92. The first frame 5 or third frame 7 is provided with at least one lamp groove 10 along the thickness direction, and the lamp groove 10 is arranged along the length direction of the first frame 5 or third frame 7. The lamp strip 91 is installed in the lamp groove 10, and the connecting plate 21 is provided with a wire outlet hole 211 relative to the position of the lamp groove 10, and the second frame 6 or fourth frame 8 is provided with a wiring groove 11 at the corresponding position. The lamp groove 10, wire outlet hole 211 and wiring groove 11 are arranged in series, one end of the power line 92 is electrically connected to the lamp strip 91, and the other end of the power line 92 is arranged in series through the lamp groove 10, wire outlet hole 211 and wiring groove 11 to be connected to the external power supply structure. The compatibility of the stainless steel profile combination plate 1 can be improved, the structure is compact, and the installation and disassembly are convenient.

[0041] Preferably, the wiring groove 11 is arranged outside the second frame 6 or the fourth frame 8 and along the length direction thereof, and the outer side of the wiring groove 11 is open. The opening width of the open side of the wiring groove 11 is smaller than the width of the groove bottom of the wiring groove 11, which facilitates the arrangement and fixation of the power supply line 92 and the maintenance of the light source assembly 9, and the installation and removal are more convenient. The power supply line 92 can also be selected to have one end led out according to the actual situation on site, which facilitates the plug-in of the power supply and has stronger compatibility.

[0042] Preferably, the first frame 5 and the third frame 7 are each provided with a lamp groove 10 on both sides, which improves the compatibility and can arrange the lamp strip 91 according to actual needs. Moreover, the outer side of the first frame 5 and the third frame 7 is also provided with a through fixing groove 12, and the end of the connecting plate 21 away from the limiting block 26 is provided with two fixing columns 27 arranged along the thickness direction, which are inserted and fixed into the fixing groove 12, and cooperate with the limiting groove 14 and the limiting block 26 to jointly fix the plug 2 and the corresponding first frame 5 or third frame 7, thereby improving the efficiency and stability of assembly. The first panel 3 and the second panel 4 are each provided with a through avoiding groove at the position relative to the lamp groove 10, which facilitates the exposure of light.

[0043] On the connecting plate 21, the third screw hole 28 connected with the second frame 6 or the fourth frame 8, the connecting block 22 and the wire outlet hole 211 are sequentially arranged between the fixing column 27 and the limiting block 26, which has compact structure and stable connection. When the plug 2 is connected with the second frame 6, two third screw holes 28 can be arranged on the connecting plate 21 to be screwed to the fourth frame 8. The plug 2 connected with the first frame 5 is provided with a mounting groove 51 on the first frame 5, and the connecting plate 21 is provided with one third screw hole 28.

[0044] In some embodiments, please refer to Figure 4 , Figure 8 The stainless steel profile combination plate 1 further includes a plurality of filling plates 15, which are arranged at intervals in the cavity and are connected with the first panel 3 on one side and connected with the second panel 4 on the other side by gluing, which is convenient to install and improves the support strength.

[0045] In some embodiments, in order to assemble and splice the plates with each other, the mounting groove 51 is arranged on both side surfaces of the side of the first frame 5 away from the third frame 7, and the mounting groove 51 is used for mounting the plate structure. The end of the plug 2 corresponding to the mounting groove 51 is provided with an avoiding opening, which improves the efficiency of assembly and the stability of the overall structure. Specifically, the stainless steel profile combination plate 1 can be used for adding layers of a wardrobe, and the mounting groove 51 can be used for mounting the back plate structure of the wardrobe, which is more stable in lapping.

[0046] The first panel 3 and the second panel 4 are both made of stainless steel structure, the first frame 5, the second frame 6, the third frame 7 and the fourth frame 8 are made of profile. The first panel 3 and the second panel 4 are connected with the first frame 5, the second frame 6, the third frame 7 and the fourth frame 8 by adhesive connection, wherein, double-sided adhesive tape 16 can be used for connection, which is convenient to install, low in cost and more environmentally friendly.

[0047] The first frame 5, the second frame 6, the third frame 7 and the fourth frame 8 are both provided with a stop edge on both sides in the thickness direction, the stop edges on the same side are matched with the sealing strip 25 on the plug 2 to form a frame-shaped closed area, the first panel 3 and the second panel 4 are both located in the corresponding closed area, and the sealing effect and stability are higher.

[0048] The embodiments of the specific implementation are the preferred embodiments of the application, and are not intended to limit the protection scope of the application, wherein the same parts are indicated by the same reference numerals. Therefore, any equivalent changes made according to the structure, shape and principle of the application should be covered within the protection scope of the application.

Claims

1. A stainless steel profiled sheet assembly, characterised in that, The utility model provides a kind of stainless steel composite panel, including multiple plugs (2), first panel (3) arranged in parallel, second panel (4) and first frame (5), second frame (6), third frame (7) and fourth frame (8) sequentially arranged between the first panel (3), the second panel (4) to form closed chamber;The first panel (3) and the second panel (4) are arranged as stainless steel structure;Multiple plugs (2) are used to connect the first frame (5), the second frame (6), the third frame (7) and the fourth frame (8) to form a whole;The plug (2) includes connecting plate (21) and connecting block (22), the connecting plate (21) and the connecting block (22) are arranged in T type;One side of the connecting plate (21) is fixedly connected with one end of the connecting block (22), the connecting block (22) is inserted into the corresponding end of the first frame (5) or the third frame (7), the connecting plate (21) is screw connected with the inner side of the corresponding end of the second frame (6) or the fourth frame (8), and multiple plugs (2) are located in the chamber.

2. The stainless steel profile composite panel according to claim 1, characterized in that The connecting block (22) is provided with at least one first screw hole (221) along the length direction, and the central axis of the first screw hole (221) is perpendicular to the length direction of the connecting block (22);The corresponding end of the first frame (5) and the third frame (7) is provided with a second screw hole (13), the first screw hole (221) and the second screw hole (13) are arranged in a staggered manner along the central axis direction, and the projection parts along the central axis direction overlap.

3. The stainless steel profile composite panel according to claim 2, characterized in that The plug (2) is provided with a through adjusting groove (23) along the length direction of the connecting block (22);One end of the adjusting groove (23) is located at the end of the connecting block (22) away from the connecting plate (21), the other end of the adjusting groove (23) is located at the side of the connecting plate (21) away from the connecting block (22), and the adjusting groove (23) is in communication with the first screw hole (221);The adjusting groove (23) is connected with the adjusting groove (23) on the adjacent another stainless steel profile composite plate by adjusting screw to fix two groups of stainless steel profile composite plates.

4. The stainless steel profile composite panel according to claim 1, wherein The outer end of the connecting plate (21) is provided with a closing block (24), the side of the connecting block (24) connected with the end of the connecting plate (21) is flush with the inner side of the connecting plate (21), and the end of the connecting block (24) is sealingly connected with the end face of the corresponding first frame (5) and third frame (7);The other end of the closing block (24) protrudes from the connecting plate (21), and the side of the other end of the closing block (24) is flush and sealingly connected with the outer side of the corresponding second frame (6) or fourth frame (8).

5. The stainless steel profile composite panel according to claim 4, characterized in that The closing block (24) is provided with an L-shaped sealing strip (25) protruding at both ends along the length direction, which is sealingly connected with the turning angles of the corresponding first panel (3) and second panel (4); the thickness of the sealing strip (25) is equal to the thickness of the first panel (3) and second panel (4).

6. The stainless steel profile composite panel of claim 1, wherein The plug (2) further comprises a limiting block (26), one end of which is fixedly connected with the inner side wall of the connecting plate (21); the inner sides of the first frame (5) and the third frame (7) are provided with limiting grooves (14) along the length direction, and the other end of the limiting block (26) is inserted into the corresponding limiting groove (14).

7. The stainless steel profile composite panel according to claim 1, wherein The stainless steel profile combined panel further comprises at least one set of light source assembly (9), which comprises a lamp strip (91) and a power line (92); at least one lamp groove (10) is provided on the side edge of the first frame (5) or the third frame (7) along the thickness direction, and the lamp groove (10) is arranged along the length direction of the first frame (5) or the third frame (7); the first panel (3) and the second panel (4) are provided with a through avoiding groove at the position relative to the lamp groove (10); the lamp strip (91) is installed in the lamp groove (10), the connecting plate (21) is provided with a wire outlet hole (211) at the position relative to the lamp groove (10), and the second frame (6) or the fourth frame (8) is provided with a wiring groove (11) at the corresponding position, the lamp groove (10), the wire outlet hole (211) and the wiring groove (11) are throughly arranged, one end of the power line (92) is electrically connected with the lamp strip (91), and the other end of the power line (92) is sequentially arranged through the lamp groove (10), the wire outlet hole (211) and the wiring groove (11) to be connected with an external power supply structure.

8. The stainless steel profile composite panel according to claim 7, characterized in that The wiring groove (11) is arranged on the outer side of the second frame (6) or the fourth frame (8) along the length direction, and the outer side of the wiring groove (11) is open; the opening width of the open side of the wiring groove (11) is smaller than the width of the groove bottom of the wiring groove (11).

9. The stainless steel profile composite panel according to claim 1, wherein The stainless steel profile combined panel further comprises a plurality of filling plates (15), which are arranged at intervals in the cavity, and one side of the filling plate (15) is adhesively connected with the first panel (3), and the other side of the filling plate (15) is adhesively connected with the second panel (4).

10. The stainless steel profile composite panel of claim 1, wherein The two side surfaces of the side of the first frame (5) away from the third frame (7) are provided with mounting grooves (51), which are used for mounting back plate structures; the end of the plug (2) corresponding to the mounting groove (51) is provided with an avoiding opening.

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