Embedded bottom box of down lamp

Abstract

The utility model provides a down lamp pre-embedded bottom box which comprises a bottom box body, a top plate and a bottom plate, the bottom box body is of a hollow cylindrical structure, and the top plate and the bottom plate are fixedly installed on the top face and the bottom face of the bottom box body respectively. At least one threading pipe is horizontally and fixedly arranged at the side part of the bottom box main body and is communicated with the inside and the outside of the bottom box main body; a through hole communicated with the inner cavity of the bottom box body is formed in the middle of the bottom plate, and the diameter of the through hole is smaller than the inner diameter of the bottom box body. The pre-embedded bottom box of the down lamp can be pre-embedded into the floor before the floor is poured so as to reserve a space and a position for mounting the down lamp, the down lamp is mounted in the bottom box main body through the through hole in the bottom plate, and the clamping arm spring buckles on the down lamp are supported and fixed through the bottom plate, so that the down lamp can be more conveniently mounted in the bottom box main body, and meanwhile, the down lamp can be conveniently mounted in the bottom box main body. And the mounting stability of the down lamp is also improved.

Description

Technical Field

[0001] This utility model relates to the technical field of auxiliary installation components for lighting fixtures, specifically to a pre-embedded bottom box for downlights. Background Technology

[0002] Downlights are recessed lighting fixtures that shine downwards, embedded in floor slabs. They are widely used in homes, commercial spaces, and offices. For downlights embedded in floor slabs, a pre-embedded base box needs to be installed before the floor slab is poured. The downlight consists of a main body and symmetrically arranged clamping spring clips on both sides of the main body. A common pre-embedded base box is a hollow, open-bottomed cylindrical structure. The downlight enters the pre-embedded base box through the bottom opening, and the two clamping spring clips, when opened upwards, abut against the inner wall of the base box, generating upward friction to install the downlight.

[0003] However, due to the small contact area between the clamping arm spring buckle and the inner wall of the embedded base box, coupled with the relative force formed by the weight of the downlight itself and the upward friction, the clamping arm spring buckle may slide down along the inner wall of the embedded base box during use, resulting in unstable installation of the downlight, or even causing the downlight to fall off. Summary of the Invention

[0004] The purpose of this utility model is to solve the problems mentioned above and provide a straight cylindrical recessed box for securely installing downlights.

[0005] The present invention achieves its purpose by adopting the following technical solution: a recessed box for downlights, comprising a box body, a top plate and a bottom plate, wherein the box body is a hollow columnar structure, and the top plate and the bottom plate are respectively fixedly installed on the top and bottom surfaces of the box body;

[0006] At least one conduit is horizontally fixed on the side of the main body of the bottom box, and the conduit connects the inside and outside of the main body of the bottom box; a through hole is opened in the middle of the bottom plate, which communicates with the inner cavity of the main body of the bottom box, and the diameter of the through hole is smaller than the inner diameter of the main body of the bottom box.

[0007] Furthermore, the columnar structure includes a cylindrical structure or a prism structure.

[0008] Furthermore, at least one of the top plate and the bottom plate is detachably fixed to the bottom box body.

[0009] Furthermore, a first snap-fit ​​ring is fixed on one side of the top plate. The outer diameter of the first snap-fit ​​ring is smaller than the outer diameter of the top plate. The first snap-fit ​​ring can be matched and snapped into the bottom box body, so that the top plate can be detachably installed on the top surface of the bottom box body.

[0010] Furthermore, a second snap-fit ​​ring is fixedly provided on one side of the base plate. The outer diameter of the second snap-fit ​​ring is smaller than the outer diameter of the base plate. The second snap-fit ​​ring can be matched and snapped into the base box body, so that the base plate can be detachably installed on the bottom surface of the base box body.

[0011] Furthermore, the conduit can be one, two, three, or four; when there is one conduit, it is fixedly installed on one side of the upper part of the bottom box body; when there are two conduits, they are installed symmetrically on the bottom box body or at a 90-degree angle; when there are three conduits, the first and second conduits are at a 90-degree angle, and the third conduit is at a 90-degree angle to the first or second conduit; when there are four conduits, adjacent conduits are at a 90-degree angle.

[0012] Furthermore, at least one fixing block is fixedly provided on the bottom outer side of the base box body, and a fixing through hole is provided on the fixing block.

[0013] Furthermore, the fixing block and the conduit are offset in the vertical direction.

[0014] Furthermore, the recessed box for the downlight also includes a sealing cover with the same number of conduits. The sealing cover includes a cover plate and a sleeve fixed to one side of the cover plate. The outer diameter of the cover plate is larger than the outer diameter of the sleeve. The sleeve can be fitted into the conduit, so that the sealing cover can be detachably installed on the outer opening of the conduit.

[0015] The recessed box for downlights in this utility model patent can be pre-embedded in the floor slab before the floor slab is poured to reserve space and position for installing downlights. The downlight is installed into the main body of the box through the through hole in the base plate, and the clamping arm spring buckle on the downlight is supported and fixed by the base plate, which makes it easier to install the downlight in the main body of the box and also improves the installation stability of the downlight. Attached Figure Description

[0016] Appendix Figure 1 This is a three-dimensional schematic diagram of the overall structure of the recessed box for the downlight in Example 1. Figure 1 .

[0017] Appendix Figure 2 This is a three-dimensional schematic diagram of the overall structure of the recessed box for the downlight in Example 1. Figure 2 .

[0018] Appendix Figure 3 This is a three-dimensional structural diagram of the recessed box for the downlight after the top plate 2 has been removed in Example 1.

[0019] Appendix Figure 4 This is a three-dimensional structural diagram of the top plate 2 in Embodiment 1.

[0020] Appendix Figure 5This is a three-dimensional schematic diagram of the overall structure of the recessed box for the downlight in Example 2. Figure 1 .

[0021] Appendix Figure 6 This is a three-dimensional schematic diagram of the overall structure of the recessed box for the downlight in Example 2. Figure 2 .

[0022] Appendix Figure 7 This is a three-dimensional structural diagram of the recessed box for the downlight after the base plate 3 is removed in Example 2.

[0023] Appendix Figure 8 This is a three-dimensional structural diagram of the base plate 3 in Example 2.

[0024] Appendix Figure 9 This is a three-dimensional schematic diagram of the overall structure of the recessed box for the downlight in Example 3.

[0025] Appendix Figure 10 This is a three-dimensional structural diagram of the recessed box for the downlight after the top plate 2 has been removed in Example 3.

[0026] Appendix Figure 11 This is a three-dimensional structural diagram of the top plate 2 in Embodiment 3.

[0027] Appendix Figure 12 This is a three-dimensional schematic diagram of the overall structure of the recessed box for the downlight in Example 4.

[0028] Appendix Figure 13 This is a three-dimensional structural diagram of the recessed box for the downlight after the base plate 3 is removed in Example 4.

[0029] Appendix Figure 14 This is a three-dimensional structural diagram of the base plate 3 in Example 4.

[0030] Appendix Figure 15 This is a three-dimensional structural diagram of the closed cover 4 in this utility model.

[0031] Appendix Figure 16 This is a schematic diagram of the installation process of the embedded bottom box for the downlight of this utility model.

[0032] The reference numerals in the attached drawings are explained as follows: 1. Base box body, 11. Conduit, 12. Fixing block, 2. Top plate, 21. First snap ring, 3. Base plate, 31. Through hole, 32. Second snap ring, 4. Sealing cover, 41. Cover plate, 42. Detailed Implementation

[0033] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort. The invention will be further described below in conjunction with the drawings:

[0034] Currently, commonly used downlights include a downlight body and clamping spring buckles symmetrically arranged on both sides of the downlight body. The downlight body includes a lampshade and a base that are fixedly connected, wherein the outer diameter of the lampshade is larger than the outer diameter of the base, and the clamping spring buckles are installed on both sides of the base symmetrically. Example 1

[0035] Refer to the instruction manual appendix Figure 1-4 A recessed box for downlights includes a main body 1, a top plate 2, a bottom plate 3, and a closing cover 4. The main body 1 is a hollow cylindrical structure with open top and bottom surfaces. The main body 1 and the bottom plate 3 are integrally formed. The top plate 2 is detachably installed on the top surface of the main body 1.

[0036] Four conduits 11 are horizontally fixed on the side of the bottom box body 1. Two adjacent conduits 11 are arranged at a 90-degree angle and the conduits 11 connect the inside and outside of the bottom box body 1. A through hole 31 is opened in the middle of the bottom plate 3, which is connected to the inner cavity of the bottom box body 1. The diameter of the through hole 31 is smaller than the inner diameter of the bottom box body 1.

[0037] The diameter of the through hole 31 is larger than the outer diameter of the base of the downlight and smaller than the outer diameter of the lampshade. When the two clamping arm spring clips of the downlight are in the horizontally open state, the distance between the two far-away ends of the two clamping arm spring clips is smaller than the diameter of the inner cavity of the base box body 1. (See attached...) Figure 16 When installing the downlight, open the two clamping spring buckles of the downlight upwards so that the two clamping spring buckles and the base of the downlight pass through the through hole 31 into the inner cavity of the base box body 1. The two clamping spring buckles return to their original position under the action of the rebound force and abut against the base plate 3. The base plate 3 is clamped between the clamping spring buckles and the lampshade of the downlight, so as to achieve a stable installation of the downlight and the downlight pre-embedded base box.

[0038] A first snap-fit ​​ring 21 is fixedly provided on one side of the top plate 2. The outer diameter of the first snap-fit ​​ring 21 is smaller than the outer diameter of the top plate 2. The first snap-fit ​​ring 21 can be matched and snapped into the bottom box body 1, so that the top plate 2 can be detachably installed on the top surface of the bottom box body 1. The function of the top plate 2 is to close the opening at the top of the bottom box body 1 to prevent concrete from entering the bottom box body 1 during pouring. The main reason for making the top plate 2 detachable is that the recessed bottom box of the downlight is produced by using a mold. Considering the simplification of the molding process and the reduction of the production difficulty of the product, if the bottom box body 1, top plate 2, and bottom plate 3 are an integral structure, then its closed structure cannot be mass-produced by a mold. The detachable connection structure allows the top plate 2 and the bottom box body 1 to be molded separately and then snapped onto the bottom box body 1 before use.

[0039] Four fixing blocks 12 are fixedly installed on the bottom of the outer side of the base box body 1. The two adjacent fixing blocks 12 are set at a 90-degree angle. Fixing through holes are opened on the fixing blocks 12. The recessed base box of the downlight can be fixedly installed on the building formwork of the floor slab after screws or nails are passed through the fixing through holes.

[0040] The fixing block 12 and the conduit 11 are offset in the vertical direction to prevent the conduit 11 from affecting the operating space when installing fixing screws or nails into the fixing through hole.

[0041] It should be noted that the accompanying drawings in the specification only show the specific drawings when there are four conduits 11 disposed on the side of the main body 1 of the bottom box. The situation where there is one, two or three conduits 11 can be inferred from the accompanying drawings of the specification of this patent and the above statement, and is easy for those skilled in the art to understand and implement.

[0042] Specifically, when there is one conduit 11, the conduit 11 is fixedly installed on one side of the upper part of the bottom box body 1; when there are two conduits 11, the two conduits 11 are installed in symmetrical positions on the bottom box body 1 or at a 90-degree angle; when there are three conduits 11, the first and second conduits 11 are at a 90-degree angle, and the third conduit 11 is at a 90-degree angle to the first or the second conduit 11.

[0043] See attached document Figure 15 The sealing cover 4 includes a cover plate 41 and a sleeve 42 fixed to one side of the cover plate 41. The outer diameter of the cover plate 41 is larger than the outer diameter of the sleeve 42. The sleeve 42 can be fitted into the conduit 11, so that the sealing cover 4 can be detachably installed on the outer end opening of the conduit 11.

[0044] Specifically, the sealing cover 4 can be a soft rubber cover or a hard plastic cover; the sealing cover 4 allows for selective use of the conduit 11, and the unused conduit 11 can be sealed by the sealing cover 4 to prevent concrete from entering the inner cavity of the bottom box body 1 from the conduit 11 during floor slab pouring. Example 2

[0045] Refer to the instruction manual appendix Figure 5-8 A recessed box for downlights includes a main body 1, a top plate 2, a bottom plate 3, and a cover 4. The main body 1 is a hollow cylindrical structure with open top and bottom surfaces. The main body 1 and the top plate 2 are integrally formed. The bottom plate 3 is detachably installed on the top surface of the main body 1.

[0046] Four conduits 11 are horizontally fixed on the side of the bottom box body 1. Two adjacent conduits 11 are arranged at a 90-degree angle and the conduits 11 connect the inside and outside of the bottom box body 1. A through hole 31 is opened in the middle of the bottom plate 3, which is connected to the inner cavity of the bottom box body 1. The diameter of the through hole 31 is smaller than the inner diameter of the bottom box body 1.

[0047] The diameter of the through hole 31 is larger than the outer diameter of the base of the downlight and smaller than the outer diameter of the lampshade. When the two clamping arm spring clips of the downlight are in the horizontally open state, the distance between the two far-away ends of the two clamping arm spring clips is smaller than the diameter of the inner cavity of the base box body 1. (See attached...) Figure 16 When installing the downlight, open the two clamping spring buckles of the downlight upwards so that the two clamping spring buckles and the base of the downlight pass through the through hole 31 into the inner cavity of the base box body 1. The two clamping spring buckles return to their original position under the action of the rebound force and abut against the base plate 3. The base plate 3 is clamped between the clamping spring buckles and the lampshade of the downlight, so as to achieve a stable installation of the downlight and the downlight pre-embedded base box.

[0048] A second snap-fit ​​ring 32 is fixedly provided on one side of the base plate 3. The outer diameter of the second snap-fit ​​ring 32 is smaller than the outer diameter of the base plate 3. The second snap-fit ​​ring 32 can be matched and snapped into the base box body 1, so that the base plate 3 can be detachably installed on the bottom surface of the base box body 1. The function of the base plate 3 is to support and fix the downlight. The downlight is clamped and fixed to the lampshade of the downlight by the clamping arm spring buckle. The main reason for making the base plate 3 detachable is that the downlight embedded base box is produced by mold. Considering the simplification of the process and the reduction of the production difficulty of the product during the molding process, if the base box body 1, top plate 2, and base plate 3 are an integral structure, then its closed structure cannot be mass-produced by mold. The detachable connection structure allows the base plate 3 and the base box body 1 to be molded separately and then snapped onto the base box body 1 before use.

[0049] It should be noted that the only difference between the recessed downlight box in Embodiment 1 and Embodiment 2 is whether the top plate 2 and the bottom plate 3 are detachably mounted on the main body 1 of the box. In Embodiment 1, the main body 1 and the bottom plate 3 are an integral structure, molded as one piece, and the top plate 2 is detachably mounted on the top surface of the main body 1. In Embodiment 2, the main body 1 and the top plate 2 are an integral structure, molded as one piece, and the bottom plate 3 is detachably mounted on the top surface of the main body 1. The positions, connection structures, and functions of other components of the recessed downlight box are the same, and therefore will not be described further. Example 3

[0050] Refer to the instruction manual appendix Figure 9-11 A recessed box for downlights includes a main body 1, a top plate 2, a bottom plate 3, and a cover 4. The main body 1 is a hollow octagonal prism structure with open top and bottom surfaces. The main body 1 and the bottom plate 3 are integrally formed. The top plate 2 is detachably installed on the top surface of the main body 1.

[0051] Four conduits 11 are horizontally fixed on four sides of the bottom box body 1 at intervals. Two adjacent conduits 11 are set at a 90-degree angle and the conduits 11 connect the inside and outside of the bottom box body 1. A through hole 31 is opened in the middle of the bottom plate 3, which is connected to the inner cavity of the bottom box body 1. The diameter of the through hole 31 is smaller than the inner diameter of the bottom box body 1.

[0052] The diameter of the through hole 31 is larger than the outer diameter of the base of the downlight and smaller than the outer diameter of the lampshade. When the two clamping arm spring clips of the downlight are in the horizontally open state, the distance between the two far-away ends of the two clamping arm spring clips is smaller than the diameter of the inner cavity of the base box body 1. (See attached...) Figure 16 When installing the downlight, open the two clamping spring buckles of the downlight upwards so that the two clamping spring buckles and the base of the downlight pass through the through hole 31 into the inner cavity of the base box body 1. The two clamping spring buckles return to their original position under the action of the rebound force and abut against the base plate 3. The base plate 3 is clamped between the clamping spring buckles and the lampshade of the downlight, so as to achieve a stable installation of the downlight and the downlight pre-embedded base box.

[0053] A first snap-fit ​​ring 21 is fixedly provided on one side of the top plate 2. The outer diameter of the first snap-fit ​​ring 21 is smaller than the outer diameter of the top plate 2. The first snap-fit ​​ring 21 can be matched and snapped into the bottom box body 1, so that the top plate 2 can be detachably installed on the top surface of the bottom box body 1. The function of the top plate 2 is to close the opening at the top of the bottom box body 1 to prevent concrete from entering the bottom box body 1 during pouring. The main reason for making the top plate 2 detachable is that the recessed bottom box of the downlight is produced by using a mold. Considering the simplification of the molding process and the reduction of the production difficulty of the product, if the bottom box body 1, top plate 2, and bottom plate 3 are an integral structure, then its closed structure cannot be mass-produced by a mold. The detachable connection structure allows the top plate 2 and the bottom box body 1 to be molded separately and then snapped onto the bottom box body 1 before use.

[0054] It should be noted that the only difference between Embodiment 3 and Embodiment 1 is the shape of the base box body 1. In Embodiment 1, the base box body 1 is a cylindrical structure, while in Embodiment 3, it is an octagonal prism structure. The only difference between Embodiment 3 and Embodiment 2 is the shape of the base box body 1 and whether the top plate 2 and bottom plate 3 are detachably mounted on the base box body 1. In Embodiment 2, the base box body 1 is a cylindrical structure, and the base box body 1 and top plate 2 are an integral structure, molded as one piece, with the bottom plate 3 detachably mounted on the top surface of the base box body 1. In Embodiment 3, the base box body 1 is an octagonal prism structure, and the base box body 1 and bottom plate 3 are an integral structure, molded as one piece, with the top plate 2 detachably mounted on the top surface of the base box body 1. The positions, connection structures, and functions of other components of the recessed base box for downlights are the same, and therefore will not be described further.

[0055] Although this embodiment only shows the case where the base box body 1 is an octagonal prism structure, the use of triangular prisms, quadrangular prisms, pentagonal prisms, dodecagonal prisms, etc., can be conceived based on the drawings in the specification of this patent and the above statements, and is easily understood and implemented by those skilled in the art. Example 4

[0056] Refer to the instruction manual appendix Figure 12-14 A recessed box for downlights includes a main body 1, a top plate 2, a bottom plate 3, and a cover 4. The main body 1 is a hollow octagonal prism structure with open top and bottom surfaces. The main body 1 and the top plate 2 are integrally formed. The bottom plate 3 is detachably installed on the top surface of the main body 1.

[0057] Four conduits 11 are horizontally fixed on four sides of the bottom box body 1 at intervals. Two adjacent conduits 11 are set at a 90-degree angle and the conduits 11 connect the inside and outside of the bottom box body 1. A through hole 31 is opened in the middle of the bottom plate 3, which is connected to the inner cavity of the bottom box body 1. The diameter of the through hole 31 is smaller than the inner diameter of the bottom box body 1.

[0058] The diameter of the through hole 31 is larger than the outer diameter of the base of the downlight and smaller than the outer diameter of the lampshade. When the two clamping arm spring clips of the downlight are in the horizontally open state, the distance between the two far-away ends of the two clamping arm spring clips is smaller than the diameter of the inner cavity of the base box body 1. (See attached...) Figure 16 When installing the downlight, open the two clamping spring buckles of the downlight upwards so that the two clamping spring buckles and the base of the downlight pass through the through hole 31 into the inner cavity of the base box body 1. The two clamping spring buckles return to their original position under the action of the rebound force and abut against the base plate 3. The base plate 3 is clamped between the clamping spring buckles and the lampshade of the downlight, so as to achieve a stable installation of the downlight and the downlight pre-embedded base box.

[0059] A second snap-fit ​​ring 32 is fixedly provided on one side of the base plate 3. The outer diameter of the second snap-fit ​​ring 32 is smaller than the outer diameter of the base plate 3. The second snap-fit ​​ring 32 can be matched and snapped into the base box body 1, so that the base plate 3 can be detachably installed on the bottom surface of the base box body 1. The function of the base plate 3 is to support and fix the downlight. The downlight is clamped and fixed to the lampshade of the downlight by the clamping arm spring buckle. The main reason for making the base plate 3 detachable is that the downlight embedded base box is produced by mold. Considering the simplification of the process and the reduction of the production difficulty of the product during the molding process, if the base box body 1, top plate 2, and base plate 3 are an integral structure, then its closed structure cannot be mass-produced by mold. The detachable connection structure allows the base plate 3 and the base box body 1 to be molded separately and then snapped onto the base box body 1 before use.

[0060] It should be noted that the difference between the recessed downlight box in Embodiment 4 and Embodiment 3 lies only in whether the top plate 2 and the bottom plate 3 are detachably mounted on the main body 1 of the box. In Embodiment 3, the main body 1 and the bottom plate 3 are an integral structure, molded as one piece, and the top plate 2 is detachably mounted on the top surface of the main body 1. In Embodiment 4, the main body 1 and the top plate 2 are an integral structure, molded as one piece, and the bottom plate 3 is detachably mounted on the top surface of the main body 1. The positions, connection structures, and functions of other components of the recessed downlight box are the same, and therefore will not be described further.

[0061] The method of using the recessed box for downlights in this patent is as follows: Before pouring concrete for the floor slab, the building formwork needs to be installed first. After the building formwork is installed, the installation position of the downlight is determined according to the design drawings. The top plate 2 and the bottom plate 3 are respectively installed on the top and bottom surfaces of the box body 1. The recessed box is placed in the corresponding position, and the recessed box is fixed to the corresponding position on the building formwork by passing through the fixing through hole with fixing screws or fixing nails.

[0062] The number of wires that need to be connected to the pre-embedded box is used selectively for the conduit 11. The wires in the floor slab are all run through the conduit embedded in the floor slab. The conduit and the conduit 11 are connected and glued and sealed together. The conduit 11 that is not used is sealed with a cover 4. After the floor slab is poured and dried, the building formwork is removed from the floor slab, and the through hole 31 of the bottom plate 3 of the pre-embedded box is exposed.

[0063] See attached document Figure 16When installing downlights, the worker first connects the power cord of the downlight to the wire inside the pre-embedded box 1. Then, the worker holds the clamping spring buckles on both sides of the downlight body to make it upright. The downlight is then inserted into the through hole 31 of the bottom plate 3 of the pre-embedded box. When most of the clamping spring buckles have entered the pre-embedded box, the clamping spring buckles are released. The clamping spring buckles rebound under their own elasticity and abut against the top surface of the bottom plate 3. Finally, the downlight is pushed completely into the pre-embedded box. The bottom plate 3 is clamped between the clamping spring buckles and the lampshade of the downlight, thus achieving a stable installation of the downlight and the downlight pre-embedded box.

[0064] It should also be noted that although the patent is titled "Downlight Embedded Base Box", since some spotlights and downlights have similar shapes and structures, the downlight embedded base box in this patent is applicable to the installation and use of spotlights and downlights.

[0065] Obviously, modifications and / or additions can be made to the above-mentioned recessed box for downlights and the corresponding methods without departing from the scope and range of this utility model.

[0066] It is equally clear that, although the present invention has described the recessed box for downlights in detail, those skilled in the art will certainly be able to obtain many other equivalent forms of recessed boxes for downlights and corresponding methods, which have the features described in the claims and are therefore within the scope of protection defined herein.

Claims

1. A recessed downlight pre-embedded bottom box, characterized in that: It comprises a bottom box body (1), a top plate (2) and a bottom plate (3), the bottom box body (1) is a hollow cylindrical structure, the top plate (2) and the bottom plate (3) are respectively fixedly installed on the top surface and the bottom surface of the bottom box body (1); At least one threading pipe (11) is horizontally fixed on the side of the bottom box body (1), the threading pipe (11) communicates the inside and outside of the bottom box body (1); a through hole (31) is formed in the middle of the bottom plate (3) and communicates with the inner cavity of the bottom box body (1), and the diameter of the through hole (31) is smaller than the inner diameter of the bottom box body (1).

2. The downlight recessed trim of claim 1, wherein: At least one of the top plate (2) and the bottom plate (3) is detachably fixedly installed on the bottom box body (1).

3. The recessed lamp pre-embedded bottom box according to claim 1, characterized in that: The cylindrical structure comprises a cylindrical structure or a prism structure.

4. The recessed lamp pre-embedded bottom box according to claim 2, characterized in that: A first clamping ring (21) is fixed on one side of the top plate (2), the outer diameter of the first clamping ring (21) is smaller than the outer diameter of the top plate (2), the first clamping ring (21) can be matched and clamped into the bottom box body (1), so that the top plate (2) is detachably installed on the top surface of the bottom box body (1).

5. The recessed lighting troffer of claim 2, wherein: A second clamping ring (32) is fixed on one side of the bottom plate (3), the outer diameter of the second clamping ring (32) is smaller than the outer diameter of the bottom plate (3), the second clamping ring (32) can be matched and clamped into the bottom box body (1), so that the bottom plate (3) is detachably installed on the bottom surface of the bottom box body (1).

6. The recessed can light bottom box of claim 1, wherein: The threading pipe (11) is provided with one or two or three or four; when the threading pipe (11) is provided with one, the threading pipe (11) is fixedly arranged on one side of the upper part of the bottom box body (1); when the threading pipe (11) is provided with two, the two threading pipes (11) are arranged at symmetrical positions of the bottom box body (1) or the two threading pipes (11) are arranged at a 90-degree angle; when the threading pipe (11) is provided with three, the first and second threading pipes (11) are arranged at a 90-degree angle, and the third threading pipe (11) is arranged at a 90-degree angle with the first or second threading pipe (11); when the threading pipe (11) is provided with four, the adjacent two threading pipes (11) are arranged at a 90-degree angle.

7. The recessed can light bottom box of claim 1, wherein: At least one fixing block (12) is fixed on the bottom of the outside of the bottom box body (1), and a fixing through hole is formed in the fixing block (12).

8. The downlight recessed trim of claim 7, wherein: The fixing block (12) and the threading pipe (11) are arranged in a vertical direction.

9. The recessed can light bottom box of claim 1, wherein: The recessed down lamp bottom box further comprises a closing cover (4) consistent with the number of the threading pipes (11), the closing cover (4) comprises a cover plate (41) and a sleeve (42) fixed on one side of the cover plate (41), the outer diameter of the cover plate (41) is greater than the outer diameter of the sleeve (42), and the sleeve (42) can be matched and sleeved into the threading pipe (11), so that the closing cover (4) is detachably installed on the opening of the outer end of the threading pipe (11).

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