Combined cassette

Abstract

The invention relates to the field of junction boxes, and discloses a combined cassette, which comprises a back plate, and an integrated box body formed by enclosing an upper side wall, a lower side wall, a left side wall and a right side wall which are vertically connected to the back plate, and also comprises a nut assembly, the nut assembly comprises a nut box with an opening at one side, and an embedded cover is clamped at the opening of the nut box. The nut box is internally provided with a nut pressed by the embedded cover, and the front side wall and the rear side wall of the nut box are both provided with via holes aligned with inner holes of the nut; embedding holes are formed in the middle parts of the left side wall and the right side wall; the nut assemblies are clamped in the embedding holes, so that the nuts are positioned on the inner side of the box body. The problems that in the prior art, junction boxes are single and independent, the junction boxes need to be installed together in order, positioning and installation are tedious, efficiency is low, gaps between the junction boxes are difficult to control, and effective protection cannot be provided for line safety can be solved.

Description

Technical Field

[0001] The invention relates to the field of junction boxes, and in particular to a combined dark box. Background Art

[0002] A junction box, as the name implies, is a box hidden in the ground. An electrical junction box is a type of junction box, including the junction boxes for hidden points, telephones, and televisions in the room. In home decoration, the junction box is one of the electrical auxiliary materials, because the wires used for decoration pass through the wire tube, and at the joints of the wires (for example, the line is long, or the wire tube needs to turn a corner), the junction box is used as a transition. The wire tube is connected to the junction box, and the wires in the wire tube are connected in the junction box, which plays a role in protecting and connecting the wires. At the same time, after the wiring is completed, it also serves as a support structure for installing and connecting switch panels and control panels.

[0003] At present, according to the requirements of decoration, it is usually necessary to gather and install multiple junction boxes together, but the existing junction boxes are independent. It is cumbersome to install the junction boxes neatly together, and the positioning and installation are inefficient. In addition, the gap between the junction boxes is difficult to control, and it is impossible to provide effective protection for the safety of the line. The construction is relatively complicated, time-consuming and labor-intensive. In addition, the side walls of the existing junction boxes are relatively thin. When the threading tube is inserted, it is difficult to effectively fix the threading tube, which easily causes the threading tube to shake or fall off; finally, the opening position and size of the existing junction box are fixed. In the actual decoration process, the commonly used wire tubes are 16 and 20 in two sizes. These two wire tubes are often mixed. The existing junction box is difficult to match these two wire tubes for universal use. The corresponding junction box must be taken separately each time, or the wire tube is difficult to fix.

[0004] In addition, the existing junction box realizes the installation of the switch panel and the control panel by setting a socket on the left and right inner walls, and then inserting an L-shaped plug into the socket, and processing a screw hole on the horizontal side of the plug exposed in the junction box for connecting the bolt of the installation panel. The plug is usually made of metal sheet, which is thin, has short threads, and some even have no threads. Such a plug-in structure has many defects in actual use, including: there are few connection points between the plug-in and the socket, the connection is weak, the plug-in is loose after being installed in the socket, and it is very easy to fall off during transportation and use, affecting the progress of electrical work; the plug-in is always exposed, and there is mortar, putty, dust and other decoration garbage in the environment during the use of the junction box. These substances are easy to adhere to the plug-in, blocking the holes on the plug-in, resulting in unstable bolt connection and inaccurate panel installation positioning; the plug-in is a metal sheet, which is easily deformed by external forces during transportation and use, resulting in cumbersome bolt connection operation, skewed bolt connection, and skewed panel installation; the plug-in is a thin sheet structure, the connection area with the bolt is small, and the support strength for the bolt and panel is small, resulting in the bolt and panel being easy to loosen. These defects make the panel bolt installation connection unstable and skewed during the use of the existing junction box, and it is easy to be affected by the decoration environment and the convenience of use is poor. Summary of the invention

[0005] The present invention is intended to provide a combined dark box to solve the problem that the conventional junction box adopts a plug-in structure for installing a connection panel, and the panel bolt installation connection is easily unstable and easily causes the panel to tilt.

[0006] To achieve the above-mentioned purpose, the present invention adopts the following technical scheme: a combined dark box, including an integrated box body surrounded by a back plate and an upper side wall, a lower side wall, a left side wall, and a right side wall vertically connected to the back plate, and also including a nut assembly, the nut assembly including a nut box with an opening on one side, an embedded cover clamped at the opening of the nut box, a nut pressed by the embedded cover is arranged in the nut box, and through holes aligned with the inner hole of the nut are arranged on the front and rear side walls of the nut box; embedded holes are opened in the middle of the left side wall and the right side wall, and the nut assembly is clamped in the embedded hole so that the nut is located on the inner side of the box body.

[0007] Preferably, as an improvement, a cover plate is provided in the embedded hole, and the top of the cover plate is flexibly connected to the inner wall of the embedded hole. After the nut assembly is clamped in the embedded hole, the cover plate is pushed and rotated to the front side of the front side wall of the nut box to cover the through hole.

[0008] Preferably, as an improvement, a connecting platform located on the back side of the nut box is formed on the inner side of the left side wall and the right side wall, and a connecting hole aligned with the inner hole of the nut is provided on the connecting platform.

[0009] Preferably, as an improvement, a plurality of wedge-shaped clamping platforms are distributed circumferentially on the outer wall of the nut box, and the wedge-shaped clamping platforms are used to clamp the nut box into the embedding hole.

[0010] Preferably, as an improvement, snap-in holes are provided on the front side wall and the rear side wall of the nut box, the embedded cover is integrally formed with a top plate extending into the nut box, the top plate is integrally formed with a wedge-shaped clamping block, and the wedge-shaped clamping block can be snapped and embedded in the snap-in holes.

[0011] Preferably, as an improvement, the nut is square, the nut is pressed into the nut box by the top plate, and the through hole and the connecting hole are both oblong holes.

[0012] Preferably, as an improvement, the tops of the upper side wall, the lower side wall, the left side wall and the right side wall are integrally formed with a rib surrounding the box body, the rib on the left side wall extends to the left to form at least two circular plugs, and the rib on the right side wall is provided with a slot that matches the shape and size of the circular plug, and the slot is laterally aligned with the circular plug.

[0013] Preferably, as an improvement, the lower portion of the left side wall extends to the left to form an annular plug-in frame, the bottom edge of the plug-in frame is provided with an insert extending parallel to the left, the bottom of the insert is provided with a raised wedge-shaped insert platform, the lower portion of the right side wall extends to the right to form an annular receiving frame, the receiving frame is consistent in shape with the plug-in frame, the inner cavity size of the receiving frame is consistent with the outer size of the plug-in frame, the bottom edge of the receiving frame is provided with a socket, and the socket is horizontally aligned with the wedge-shaped insert platform.

[0014] Preferably, as an improvement, the side edges of the receiving frame are flush with the upper side wall and the lower side wall, and the bottom edge of the receiving frame is flush with the back plate.

[0015] Preferably, as an improvement, a plurality of wire tube holes are provided on the upper side wall, the lower side wall, the left side wall and the right side wall, baffles are provided in the wire tube holes, and connecting strips are integrally formed between the baffles and the wire tube hole walls, and the width of the connecting strips is not greater than 1 mm.

[0016] Preferably, as an improvement, a plug-in tube is integrally formed on the outer side of one or more wire tube holes on the upper side wall, the lower side wall, the left side wall, and the right side wall, and the inner hole of the plug-in tube is provided with at least one step.

[0017] Preferably, as an improvement, the inner hole of the plug-in tube is provided with a step, and the major diameter of the inner hole of the plug-in tube is 20 mm and the minor diameter is 16 mm.

[0018] Preferably, as an improvement, the inner wall of the plug-in tube is provided with wedge-shaped clamping strips uniformly distributed along the circumferential direction, the wedge-shaped clamping strips extend along the axial direction, and the large ends of the wedge-shaped clamping strips face the inner side of the box body.

[0019] Preferably, as an improvement, wedge-shaped reinforcing ribs are integrally formed between the upper side wall, the lower side wall and the top rib.

[0020] Preferably, as an improvement, it further comprises a box cover, and the top ends of the left side wall and the right side wall are provided with slots for snapping into the box cover.

[0021] The principle and advantage of this solution are: in actual application, a single dark box is formed in one piece by injection molding, and can be equipped with a box cover when leaving the factory. The box cover is snapped onto the box body to protect the interior. The wire tube hole is used to pass through the connecting wire tube, and the baffle is used to shield and protect the wire tube hole before use. When in use, the baffle can be knocked off to pass the wire tube. The baffle is fixed by an integrally injected connecting strip. Compared with the prior art method of stamping grooves on the side wall to determine the position of the wire tube hole and forming an internal baffle, it can avoid the box body from breaking in the process of knocking off the baffle.

[0022] The nut assembly is used as a connection structure for connecting switch panels, control panels and other panels after the concealed box is installed, providing a bolt connection point. The nut is used as a bolt connection fixing. Compared with the insert in the prior art, it has a longer thread, which can provide a more stable connection for the bolt, and thus provide a more stable installation connection effect for the panel, ensuring that the bolt and panel are installed stably and positioned accurately to avoid panel skew. The nut box and the embedded cover are both installed with multi-point clips, which are easy to operate and the connection is stable and reliable, and not easy to loosen or lose. The nut box and the embedded cover also provide protection and limit for the nuts. With the use of oblong hole through holes, the bolts can be connected to the nuts more easily, ensuring that the nuts can be smoothly connected to the bolts, and improving the convenience of bolt positioning connection during panel installation.

[0023] The cover plate in the embedded hole can be integrally injection molded with the box body. By limiting the area where the cover plate is connected to the embedded hole, the connection between the cover plate and the embedded hole has a certain degree of flexibility. In this way, the cover plate can be formed while the box body is produced, and the production process is good. When installing the nut assembly, the nut box pushes the cover plate to fold around the connection point with the embedded hole to achieve the installation of the nut box in the embedded hole. At the same time, the cover plate moves to the front side of the nut box to cover the through hole and the nut. In this way, the through hole and the nut can be protected before installing the panel to prevent mortar, putty, etc. from entering and affecting the nut, further ensuring that the bolts can be installed smoothly during the panel installation process.

[0024] The connection platform and the connection holes on the inner side of the box can be used as screw connection points for fixing the box to the wall, which is convenient for fixing the box to the wall to prevent movement. On the other hand, it can be used as a positioning connection point for the tail end of the bolt during the panel installation process to fix the tail end of the bolt, further ensuring that the panel installed by the bolt is stable and firm.

[0025] The dark box of this scheme can be used alone, or two or more dark boxes can be spliced ​​side by side. The two dark boxes are firmly spliced ​​by the plug-in cooperation of the round plug and the slot, and the plug-in cooperation of the receiving frame and the plug-in frame. The connection between the receiving frame and the plug-in frame is matched by shape and size on the one hand, and stably connected by the insert strip, the wedge-shaped plug and the socket on the other hand, to ensure that the splicing of two adjacent dark boxes is stable and reliable. In this way, the positioning and connection operation of the two dark boxes are convenient and fast. The splicing distance between the two dark boxes can also be conveniently controlled by the receiving frame and the plug-in frame, the round plug and the slot, which can provide effective protection for line safety.

[0026] The baffle in the wire tube hole can prevent debris from clogging and damaging the wire tube hole before the dark box is used. When using it, just squeeze the baffle with a little force to break the connecting strip. The plug-in tube outside the wire tube hole can guide and fix the end of the wire tube. The wedge-shaped clamping strip inside it is conducive to fixing the wire tube to prevent the wire tube from shaking or falling off. The step structure and size inside the plug-in tube can meet the plug-in fixation of conventional 16-wire tubes and 20-wire tubes. It is universal and can be used in different wire tube situations. There is no need to use a dark box corresponding to the wire tube separately, which is more conducive to improving the convenience and efficiency of electrical pipeline layout. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 It is a front view of an embodiment of the present invention.

[0028] Figure 2 It is a lower left isometric view of an embodiment of the present invention.

[0029] Figure 3 It is an upper right isometric view of an embodiment of the present invention.

[0030] Figure 4 It is a lower left isometric view of two dark boxes spliced ​​together in an embodiment of the present invention.

[0031] Figure 5 It is an upper right isometric view of two dark boxes spliced ​​together in an embodiment of the present invention.

[0032] Figure 6 It is an axonometric view of the box body in the embodiment of the present invention.

[0033] Figure 7 It is an axonometric view of the nut assembly in an embodiment of the present invention.

[0034] Figure 8 1 is an exploded view of the nut assembly in an embodiment of the present invention.

[0035] Fig. 9 It is a three-dimensional diagram of the nut box in the embodiment of the present invention.

[0036] Fig.10 It is a three-dimensional diagram of the embedded cover in the embodiment of the present invention. DETAILED DESCRIPTION

[0037] The following is further described in detail through specific implementation methods:

[0038] The figure marks in the drawings of the specification include: back plate 1, upper side wall 2, lower side wall 3, left side wall 4, right side wall 5, retaining edge 6, round plug 7, slot 8, plug-in frame 9, plug-in piece 10, receiving frame 11, plug hole 12, wire tube hole 13, retaining piece 14, connecting strip 15, plug-in tube 16, step 17, wedge-shaped clamping strip 18, reinforcing rib 19, clamping groove 20, wedge-shaped plug-in platform 21, embedded hole 22, cover plate 23, connecting edge 24, nut box 25, wedge-shaped clamping platform 26, connecting platform 27, connecting hole 28, embedded cover 29, nut 30, through hole 31, clamping hole 32, top plate 33, wedge-shaped clamping block 34.

[0039] The embodiment is basically as shown in the attached Figure 1 As shown: A combined dark box, including a back plate 1 and an integrated square box body surrounded by an upper side wall 2, a lower side wall 3, a left side wall 4, and a right side wall 5 vertically connected to the back plate 1. The left side wall 4 and the right side wall 5 at the opening of the box body are provided with a slot 20 for clamping the box cover. It also includes a nut 30 assembly, combined with Figure 7 , Figure 8 As shown, the nut 30 assembly includes a nut box 25 with an opening on one side, combined with Fig. 9 As shown, the front side wall and the rear side wall of the nut box 25 are provided with a snap-in hole 32, and the opening of the nut box 25 is connected with an embedded cover 29. Fig.10 As shown, the cover 29 is integrally formed with a top plate 33 extending into the nut box 25, and the top plate 33 is integrally formed with a wedge-shaped clamping block 34 corresponding to the clamping hole 32, and the wedge-shaped clamping block 34 is clamped in the clamping hole 32 to achieve the connection between the cover 29 and the nut box 25. A square nut 30 is arranged in the nut box 25, one side of the nut 30 is pressed by the top plate 33, and the other parallel side is against the inner wall of the nut box 25, and a threaded inner hole is arranged in the middle of the nut 30. The front and rear side walls of the nut box 25 are both provided with through holes 31 aligned with the inner hole of the nut 30, and the through holes 31 are oblong holes.

[0040] Combination Figure 6As shown, the left side wall 4 and the right side wall 5 of the box body are provided with an embedding hole 22 in the middle front side, and a cover plate 23 is provided in the embedding hole 22. The top of the cover plate 23 is provided with two flexible connecting edges 24 connected to the inner wall of the embedding hole 22. In this embodiment, the cover plate 23 and the two connecting edges 24 are integrally injection molded on the side wall of the box body. The width of the connecting edge 24 is not more than 1mm, and the thickness of the connecting edge 24 is not more than 0.5mm, so that the connecting edge 24 has a certain flexibility, and a flexible connection between the cover plate 23 and the inner wall of the embedding hole 22 is realized. There are a plurality of wedge-shaped clamping platforms 26 distributed along the circumferential direction on the outer wall of the nut box 25. The wedge-shaped clamping platforms 26 are used to clamp the nut box 25 in the embedding hole 22 so that the nut 30 is located on the inner side of the box body. After the nut box 25 is clamped in the embedding hole 22, the cover plate 23 is pushed and rotated to the front side of the nut box 25 to cover the through hole 31 and the nut 30.

[0041] A connecting platform 27 located on the back side of the nut box 25 is integrally formed on the inner side of the left side wall 4 and the right side wall 5 of the box body. A connecting hole 28 aligned with the inner hole of the nut 30 is provided on the connecting platform 27, and the connecting hole 28 is an oblong hole.

[0042] Combination Figure 2 As shown, the top of the upper side wall 2, the lower side wall 3, the left side wall 4, and the right side wall 5 are integrally formed with a retaining edge 6 surrounding the box body opening, and a wedge-shaped reinforcing rib 19 is integrally formed between the upper side wall 2, the lower side wall 3 and the top retaining edge 6. The retaining edge 6 on the left side wall 4 extends to the left to form two circular plugs 7, and the retaining edge 6 on the right side wall 5 is provided with slots 8 that match the number, shape, and size of the circular plugs 7, and the slots 8 are horizontally aligned with the circular plugs 7. Figure 3 As shown, the lower part of the left side wall 4 extends to the left to form a square ring-shaped plug-in frame 9, and two plug-in pieces 10 extending to the left and in parallel are arranged side by side on the bottom of the plug-in frame 9, and a raised wedge-shaped plug-in platform 21 is integrally formed at the bottom of the plug-in piece 10. The lower part of the right side wall 5 extends to the right to form a square ring-shaped receiving frame 11, and the shape of the receiving frame 11 is consistent with that of the plug-in frame 9, and the inner cavity size of the receiving frame 11 is consistent with the outer size of the plug-in frame 9. The side of the receiving frame 11 is flush with the upper side wall 2 and the lower side wall 3, and the bottom of the receiving frame 11 is flush with the back plate 1. Two plug holes 12 are arranged on the bottom of the receiving frame 11, and the plug holes 12 are horizontally aligned with the wedge-shaped plug-in platform 21.

[0043] A plurality of wire tube holes 13 are provided on the upper side wall 2, the lower side wall 3, the left side wall 4 and the right side wall 5. A baffle 14 is provided in the wire tube hole 13. A connecting strip 15 is integrally formed between the baffle 14 and the wall of the wire tube hole 13. The width and thickness of the connecting strip 15 are not greater than 1 mm.

[0044] There are three wire tube holes 13 on the upper side wall 2 and the lower side wall 3. A plug-in tube 16 is integrally formed on the outer side of each wire tube hole 13 on the upper side wall 2 and the lower side wall 3. The plug-in tube 16 is coaxially arranged with the wire tube hole 13. A step 17 is arranged in the inner hole of the plug-in tube 16. The major diameter of the inner hole of the plug-in tube 16 is 20 mm and the minor diameter is 16 mm. The inner wall of the plug-in tube 16 is provided with wedge-shaped clamping strips 18 uniformly distributed along the circumferential direction. The wedge-shaped clamping strips 18 extend in the axial direction, and the major end of the wedge-shaped clamping strips 18 faces the inner side of the box body.

[0045] The specific implementation process is as follows: the box body is integrally injection molded, and the wire tube hole 13, baffle 14, connecting strip 15, plug tube 16, wedge-shaped clamping strip 18, embedded hole 22, cover plate 23, connecting edge 24, receiving frame 11, plug frame 9, insert 10, wedge-shaped insert 21, and plug hole 12 are all integrally injection molded by a mold during the injection molding process, and the nut box 25, insert cover 29, and nut 30 are produced separately. In this way, the baffle 14 in the wire tube hole 13 on the box body can be knocked down with a little force when in use, and will not cause damage to the wire tube hole 13. In the prior art, the wire tube hole 13 position is mostly punched out on the front side wall by stamping, and the middle plate material is retained. This method and structure is easy to cause the side wall to break in the process of knocking off the middle plate material to form the wire tube hole 13 when in use, and then the wire tube cannot be stably installed, but the method of the present invention can effectively avoid this.

[0046] The cover plate 23 in the embedded hole 22 on the box body is integrally injection molded with the box body. By limiting the area where the cover plate 23 is connected to the embedded hole 22, the connection between the cover plate 23 and the embedded hole 22 has a certain flexibility. In this way, the cover plate 23 can be formed while the box body is being produced, and the production process is good. When installing the nut 30 assembly, the nut box 25 pushes the cover plate 23 to fold around the connection point with the embedded hole 22, so that the nut box 25 is installed in the embedded hole 22. At the same time, the cover plate 23 moves to the front side of the nut box 25 to cover the through hole 31 and the nut 30. In this way, the through hole 31 and the nut 30 can be protected before installing the panel to prevent mortar, putty, etc. from entering and affecting the nut 30, further ensuring that the bolts can be installed smoothly during the panel installation process. When installing the panel, the connecting edge 24 can also be easily torn off to remove the cover plate 23 for panel installation operations.

[0047] The connection platform 27 on the inner side of the box body and the connection hole 28 thereon can be used as a screw connection point for fixing the box body on the wall, so as to facilitate fixing the box body to the wall to prevent movement. On the other hand, it can be used as a positioning connection point for the tail end of the bolt during the panel installation process to fix the tail end of the bolt, further ensuring that the panel installed by the bolt is stable and firm.

[0048] A single dark box is formed by injection molding and comes with a box cover when it leaves the factory. The box cover snaps onto the box body to protect the interior. It can be used individually or as a Figure 4 , Figure 5 As shown, two or more dark boxes are spliced ​​side by side for use. The two dark boxes are firmly spliced ​​by the plug-in cooperation of the round plug 7 and the slot 8, and the plug-in cooperation of the receiving frame 11 and the plug-in frame 9. The connection between the receiving frame 11 and the plug-in frame 9 is matched by shape and size on the one hand, and stably connected by the insert strip, the wedge-shaped insert 21 and the socket 12 on the other hand, to ensure that the splicing of two adjacent dark boxes is stable and reliable. In this way, the positioning and connection operation of the two dark boxes are convenient and fast. The splicing distance between the two dark boxes can be conveniently controlled by the receiving frame 11 and the plug-in frame 9, the round plug 7 and the slot 8, which can provide effective protection for line safety. The baffle 14 in the wire tube hole 13 can prevent debris from clogging and damaging the wire tube hole 13 before the dark box is used. When using it, just squeeze the baffle 14 slightly to break the connecting strip 15. The plug-in tube 16 outside the wire tube hole 13 can guide and fix the end of the wire tube. The wedge-shaped clamping strip 18 inside it is conducive to fixing the wire tube and preventing the wire tube from shaking or falling off. The structure and size of the step 17 in the plug-in tube 16 can meet the plug-in and fixation of conventional 16-wire tubes and 20-wire tubes. It is universal and can be used in different wire tube situations. There is no need to use a separate dark box for the corresponding wire tube, which is more conducive to improving the convenience and efficiency of electrical pipeline layout.

[0049] The box body is provided with a plurality of wedge-shaped clamping platforms 26 on the nut box 25 to realize multi-point clamping installation of the nut 30 assembly, which has better stability than the simple plug-in structure of the insert 10 in the prior art, ensuring that the nut 30 assembly is not easy to loosen and fall. In the nut 30 assembly, the square nut 30, the top plate 33 of the insert cover 29 and the structure of the nut box 25 are used to limit and position the nut 30, and the oblong hole 31 is used to increase the positioning tolerance range of the connection between the bolt and the nut 30, ensuring that the bolt can be smoothly connected to the nut 30. Compared with the insert 10 in the prior art, the nut 30 has a longer thread length, which can provide a more stable and firm connection and better guidance for the bolt, ensuring that the panel installation is stable and reliable and the positioning is accurate, and avoiding loosening and skewing of the panel installation.

[0050] The above is only an embodiment of the present invention, and the common knowledge such as the known specific technical solutions and / or characteristics in the solution is not described in detail here. It should be pointed out that for those skilled in the art, without departing from the technical solution of the present invention, several modifications and improvements can be made, which should also be regarded as the protection scope of the present invention, and these will not affect the effect of the implementation of the present invention and the practicality of the patent. The scope of protection required by this application shall be based on the content of its claims, and the specific implementation methods and other records in the specification can be used to interpret the content of the claims.

Claims

1. A combined dark box, comprising an integrated box body formed by a back plate and an upper side wall, a lower side wall, a left side wall and a right side wall vertically connected to the back plate, characterized in that: It also includes a nut assembly, which includes a nut box with an opening on one side, an embedded cover clamped at the opening of the nut box, a nut pressed by the embedded cover is arranged in the nut box, and through holes aligned with the inner hole of the nut are arranged on the front and rear side walls of the nut box; the middle parts of the left side wall and the right side wall are opened with embedded holes, and the nut assembly is clamped in the embedded holes so that the nut is located on the inner side of the box body.

2. A combined dark box according to claim 1, characterized in that: A cover plate is provided in the embedding hole, and the top of the cover plate is flexibly connected to the inner wall of the embedding hole. After the nut assembly is clamped in the embedding hole, the cover plate is pushed and rotated to the front side of the front side wall of the nut box to cover the through hole.

3. A combined dark box according to claim 2, characterized in that: A connecting platform located at the back side of the nut box is formed on the inner side of the left side wall and the right side wall, and a connecting hole aligned with the inner hole of the nut is provided on the connecting platform.

4. A combined dark box according to claim 3, characterized in that: A plurality of wedge-shaped clamping platforms are distributed circumferentially on the outer wall of the nut box, and the wedge-shaped clamping platforms are used to clamp the nut box into the embedding hole.

5. A combined dark box according to claim 4, characterized in that: The front side wall and the rear side wall of the nut box are provided with snap-in holes, the embedded cover is integrally formed with a top plate extending into the nut box, the top plate is integrally formed with a wedge-shaped snap block, and the wedge-shaped snap block can be snapped and embedded in the snap-in holes.

6. A combined dark box according to claim 5, characterized in that: The nut is square in shape, and is pressed in the nut box by the top plate. The through hole and the connecting hole are both oblong holes.

7. A combined dark box according to claim 1, characterized in that: The tops of the upper side wall, lower side wall, left side wall and right side wall are integrally formed with a rib surrounding the box body, the rib on the left side wall extends to the left to form at least two circular plugs, and the rib on the right side wall is provided with a slot that matches the shape and size of the circular plug, and the slot is laterally aligned with the circular plug.

8. A combined dark box according to claim 7, characterized in that: The lower part of the left side wall extends to the left to form an annular plug-in frame, the bottom edge of the plug-in frame is provided with an insert extending parallel to the left, and the bottom of the insert is provided with a raised wedge-shaped insert. The lower part of the right side wall extends to the right to form an annular receiving frame, the receiving frame is consistent in shape with the plug-in frame, the inner cavity size of the receiving frame is consistent with the outer size of the plug-in frame, and a socket is provided on the bottom edge of the receiving frame, and the socket is horizontally aligned with the wedge-shaped insert.

9. A combined dark box according to claim 1, characterized in that: Multiple wire tube holes are provided on the upper side wall, the lower side wall, the left side wall and the right side wall. Baffles are provided in the wire tube holes. Connecting strips are integrally injection-molded between the baffles and the wire tube hole walls. The width of the connecting strips is not greater than 1 mm.

10. A combined dark box according to claim 9, characterized in that: An insert tube is integrally formed on the outer side of one or more wire tube holes on the upper side wall, the lower side wall, the left side wall and the right side wall. The insert tube is coaxial with the wire tube hole, and the inner hole of the insert tube is provided with at least one step.

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