Embedded bottom box of down lamp

Abstract

The embedded bottom box of the down lamp comprises a bottom box main body, an upper cover, a driving box and a second threading pipe, the bottom box main body is of a hollow cylindrical structure with the top end and the bottom end opened, and the upper cover is installed at the top end opening of the bottom box main body; the driving box is fixedly and horizontally arranged at the side part of the bottom box main body, the driving box is of a hollow structure, the second threading pipe is arranged at the other end of the driving box, and the second threading pipe is cylindrical; the driving box communicated with the bottom box main body can transversely expand the internal containing space of the down lamp pre-embedded bottom box, the inner cavity of the bottom box main body is used for containing the down lamp main body, the driving box is used for containing the external driving power supply of the down lamp, and the requirement that the internal space of the down lamp pre-embedded bottom box contains the lower driving power supply and the down lamp main body can be met without using a heightening ring; and the selection of a user on the down lamp with the external driving power supply is not limited.

Description

Technical Field

[0001] The utility model relates to the technical field of auxiliary lamp installation parts, in particular to a pre-buried bottom box for a downlight. Background Art

[0002] Downlights are a type of lighting fixture that is embedded in the ceiling or floor and radiates light downwards. They are widely used in homes, businesses and offices. Downlights embedded in the floor require a pre-buried downlight box before the floor is poured, so that the downlight can be embedded and installed in the floor through the pre-buried downlight box. Downlights are divided into two types: external driver power supply type and internal driver power supply type. Compared with internal driver power supply downlights, external driver power supply downlights can effectively reduce light decay and have better heat dissipation, thereby extending the service life of the lamp. Therefore, more and more people are beginning to choose external driver power supply downlights. Please refer to the attached Fig. 9 It is a common downlight with an external driving power supply, which includes a downlight body, clamp arm spring buckles symmetrically arranged on both sides of the downlight body, and an external driving power supply connected to the downlight body through wires. The downlight is fixedly installed in the embedded bottom box by the elastic force of the clamp arm spring buckles.

[0003] However, the biggest disadvantage of the downlight with an external driver power supply is that it occupies a large installation space. When the downlight with an external driver power supply is installed in a pre-buried bottom box, the driver power supply and the downlight body need to be placed in the internal space of the pre-buried bottom box together. It often happens that the internal space of the pre-buried bottom box cannot accommodate the driver power supply and the downlight body, which limits the selection of downlights with an external driver power supply. At present, in order to solve the above problem, some manufacturers set a heightening ring on the pre-buried bottom box to increase the internal space of the pre-buried bottom box, but this will also increase the overall height of the pre-buried bottom box. Some floor slabs are only 10 cm thick and can only be pre-buried in an 8 cm pre-buried bottom box. After the pre-buried bottom box is raised, it cannot be used for a floor slab with a thickness of 10 cm, so the use of the heightening ring will also be limited. Therefore, there is an urgent need for a new type of embedded downlight pre-buried bottom box that can accommodate the driver power supply and the downlight body without a heightening ring to solve the above problem. Summary of the invention

[0004] The purpose of the utility model is to solve the above-mentioned problems and to provide a pre-buried bottom box for an embedded downlight suitable for a downlight with an external driving power supply. The pre-buried bottom box for the embedded downlight has a driving box for separately placing the driving power supply. The driving power supply and the downlight body can be accommodated in the pre-buried bottom box for the embedded downlight without raising the pre-buried bottom box.

[0005] The utility model adopts the following technical scheme to achieve its invention purpose: a pre-buried bottom box of a downlight, comprising a bottom box body, an upper cover, a drive box and a second threading tube, wherein the bottom box body is a cylindrical structure with a hollow interior and openings at the top and bottom ends, and the upper cover is installed at the top opening of the bottom box body to close the top opening of the bottom box body;

[0006] The drive box is fixed and horizontally arranged on the side of the base box body. The drive box is a hollow structure. A through groove connecting the inner cavity of the base box body with the inner cavity of the drive box is arranged at the connection between the drive box and the base box body. The second threading tube is arranged at the other end of the drive box. The second threading tube is cylindrical and connects the inside and outside of the drive box.

[0007] Furthermore, the embedded base box for the downlight also includes a first wire threading tube, at least one of which is fixed and horizontally arranged on the side of the base box body, the first wire threading tube is cylindrical, and the first wire threading tube connects the inside and outside of the base box body, and the end caps that are the same in number as the first wire threading tubes are detachably installed on the outer end opening of the first wire threading tube.

[0008] Further, the inner end of the first wire threading tube extends into the inner cavity of the bottom box body, and the outer end extends horizontally toward the outside of the bottom box body, and reinforcing ribs are provided on the inner side of the bottom box body and between the first wire threading tube and the inner wall of the bottom box body; or, the inner end of the first wire threading tube is fixedly connected to the outer wall of the bottom box body, and the outer end extends horizontally toward the outside of the bottom box body, and ribs are provided on the outside of the bottom box body and between the first wire threading tube and the outer wall of the bottom box body.

[0009] Furthermore, the bottom box body is in a truncated cone shape as a whole, the diameter of the top opening is larger than the diameter of the bottom opening, and the inner wall surface of the bottom box body is an arc-shaped inclined surface.

[0010] Furthermore, there are one, two or three first threading tubes arranged on the side of the base box body; when there is one first threading tube, the first threading tube and the drive box are symmetrically arranged or the first threading tube and the drive box are arranged at a 90-degree angle; when there are two first threading tubes, the two first threading tubes are symmetrically arranged and any one of the first threading tubes is arranged at a 90-degree angle to the drive box, or the two first threading tubes are arranged at a 90-degree angle and one first threading tube is arranged at a 90-degree angle to the drive box; when there are three first threading tubes, the first one is arranged at a 90-degree angle to the second first threading tube, the third first threading tube is arranged at a 90-degree angle to the first or second first threading tube, and the third first threading tube is arranged at a 90-degree angle to the drive box.

[0011] Furthermore, the bottom box body also includes a mounting base, which is fixedly mounted on the bottom edge of the bottom box body, and a plurality of mounting holes are arranged at equal distances on the mounting base.

[0012] Preferably, the upper cover and the bottom box body are an integral structure and are integrally formed, or the upper cover and the bottom box body are a split structure, and the upper cover is detachably mounted on the top opening of the bottom box body.

[0013] Furthermore, the drive box includes a fixed section, a movable section and a connecting structure that detachably connects the movable section to the end of the fixed section, the connecting structure includes a socket frame arranged at the end of the fixed section and a socket groove arranged at the end of the movable section, the socket frame extends out of the end of the fixed section, the socket groove is arranged on the inner side of the end of the movable section, the socket frame can be matched and socketed in the socket groove, and the second threading tube is arranged at the other end of the movable section.

[0014] Preferably, a support plate is fixedly provided at the bottom of the driving box, and the bottom surface of the support plate is flush with the bottom surface of the bottom box body.

[0015] Preferably, the inner wall surface of the bottom box body and the bottom surface of the driving box form an arc-shaped transition surface.

[0016] The pre-buried bottom box of the downlight in the utility model patent can be embedded into the floor before the floor is poured to reserve space and position for installing the downlight. At the same time, the drive box connected to the bottom box body can horizontally expand the internal accommodation space of the pre-buried bottom box of the downlight. The inner cavity of the bottom box body is used to accommodate the downlight body, and the drive box is used to accommodate the external drive power supply of the downlight. There is no need to use a heightening ring to meet the internal space of the pre-buried bottom box of the downlight to accommodate the drive power supply and the downlight body, so that the user's choice of downlights with external drive power supplies will not be restricted. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Attached Figure 1 This is a three-dimensional schematic diagram of the overall structure of Example 1 of the utility model. Figure 1 .

[0018] Attached Figure 2 This is a three-dimensional schematic diagram of the overall structure of Example 1 of the utility model. Figure 2 .

[0019] Attached Figure 3 It is a front view of the overall structure of Example 1 of the utility model.

[0020] Attached Figure 4 It is a schematic diagram of the three-dimensional structure after the upper cover 2 and the end cover 5 in Example 1 of the utility model are disassembled.

[0021] Attached Figure 5 This is a three-dimensional schematic diagram of the overall structure of Example 2 of the utility model. Figure 1 .

[0022] Attached Figure 6 This is a three-dimensional schematic diagram of the overall structure of Example 2 of the utility model. Figure 2 .

[0023] Attached Figure 7 It is a front view of the overall structure of Example 2 of the utility model.

[0024] Attached Figure 8It is a schematic diagram of the three-dimensional structure after the upper cover 2 and the end cover 5 in Example 2 of the utility model are disassembled.

[0025] Attached Fig. 9 This is a physical picture of a common downlight with an external driver.

[0026] The reference numerals are explained as follows: base box body 1, mounting base 11, mounting hole 111, reinforcing rib 12, through groove 13, rib 14, arc-shaped transition surface 15, upper cover 2, drive box 3, support plate 31, fixed section 32, socket frame 321, movable section 33, socket groove 331, first threading tube 4, end cover 5, second threading tube 6. DETAILED DESCRIPTION

[0027] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the prior art descriptions are briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work. The invention content is further described below in conjunction with the drawings:

[0028] Refer to the instruction manual Fig. 9 It is a common downlight with an external driving power supply, which comprises a downlight body, clamp arm spring buckles symmetrically arranged on both sides of the downlight body, and an external driving power supply connected to the downlight body through wires. Example

[0029] Refer to the instruction manual Figure 1-4 A pre-buried bottom box for a downlight comprises a bottom box body 1, an upper cover 2, a drive box 3, a first threading tube 4, an end cover 5 and a second threading tube 6; the bottom box body 1 is a cylindrical structure with a hollow interior and openings at the top and bottom, specifically a truncated cone-shaped cylindrical structure, the diameter of the top opening is larger than the diameter of the bottom opening, and the inner wall surface of the bottom box body 1 is an arc-shaped inclined surface;

[0030] The base box body 1 also includes a mounting base 11, which is fixedly mounted on the bottom edge of the base box body 1, and a plurality of mounting holes 111 are arranged at equal distances on the mounting base 11; specifically, the pre-embedded base box of the downlight can be fixedly mounted on the building formwork for pouring the floor slab by passing screws or nails through the mounting holes 111, and the pre-embedded base box can be embedded in the floor slab after concrete pouring.

[0031] The function of the upper cover 2 is to close the top opening of the bottom box body 1 to prevent entry into the bottom box body 1 during concrete pouring. In one embodiment, the upper cover 2 and the bottom box body 1 are an integral structure and are formed as one piece; in another embodiment, the upper cover 2 and the bottom box body 1 are a split structure, the upper cover 2 includes an upper cover plate and an upper cover plate flange, the upper cover plate is a circular plate with the same specifications as the top of the bottom box body 1, the upper cover plate flange is a cylinder arranged at the bottom of the upper cover plate and perpendicular to the upper cover plate, the upper cover 2 is connected to the top of the bottom box body 1 through the matching sleeve of the upper cover plate flange to achieve a fixed connection with the bottom box body 1; the upper cover 2 and the bottom box body 1 are designed as a split connection structure mainly to simplify the process difficulty during the compression molding process and reduce the production difficulty of the product. The split connection structure can be used by compression molding the upper cover 2 and the bottom box body 1 separately, and then the upper cover 2 is snapped and installed on the bottom box body 1 before use.

[0032] The driving box 3 is fixed and horizontally arranged on the side of the bottom box body 1. The driving box 3 is a hollow structure. A through groove 13 is arranged at the connection between the driving box 3 and the bottom box body 1 to connect the inner cavity of the bottom box body 1 with the inner cavity of the driving box 3. The driving box 3 can horizontally expand the internal accommodation space of the pre-buried bottom box of the downlight. The inner cavity of the bottom box body 1 is used to accommodate the downlight body, and the inner cavity of the driving box 3 is used to accommodate the external driving power supply of the downlight, which can solve the problem that the internal space of the pre-buried bottom box of the downlight commonly used at present cannot accommodate the driving power supply and the downlight body.

[0033] Refer to the instruction manual Figure 4 The drive box 3 includes a fixed section 32, a movable section 33 and a connecting structure for detachably connecting the movable section 33 to the end of the fixed section 32. The connecting structure includes a sleeve frame 321 provided at the end of the fixed section 32 and a sleeve groove 331 provided at the end of the movable section 33. The sleeve frame 321 extends out of the end of the fixed section 32. The sleeve groove 331 is provided at the inner side of the end of the movable section 33. The sleeve frame 321 can be matched and sleeved in the sleeve groove 331.

[0034] The drive box 3 is designed as a split connection structure mainly to simplify the process difficulty during the molding process and reduce the difficulty of product production. The split connection structure can mold the fixed section 32 and the bottom box body 1 as one piece, and the movable section 33 can be molded separately. Before use, the movable section 33 can be installed on the fixed section 32 for use.

[0035] Refer to the instruction manual Figure 2-4A support plate 31 is fixedly provided at the bottom of the driver box 3. The support plate 31 is a columnar structure with a straight line, a cross, a circle, a square or other shapes in cross section. The support plate 31 can be arranged at the bottom of the fixed section 32 or the movable section 33. The bottom surface of the support plate 31 is flush with the bottom surface of the bottom box body 1. After the downlight pre-embedded bottom box is fixedly installed on the building template for pouring the floor slab by screws or nails passing through the mounting holes 111, the support plate 31 is also supported on the building template to provide support force for the driver box 3 to prevent the driver box 3 from being compressed and deformed during the construction process, thereby affecting the subsequent normal use.

[0036] The first threading tube 4 is arranged on the side of the bottom box body 1. The first threading tube 4 is cylindrical and connects the inside and outside of the bottom box body 1. The inner end of the first threading tube 4 extends into the inner cavity of the bottom box body 1, and the outer end extends horizontally toward the outside of the bottom box body 1. Reinforcing ribs 12 are provided on the inner side of the bottom box body 1 and between the first threading tube 4 and the inner wall of the bottom box body 1. The reinforcing ribs 12 structurally reinforce the first threading tube 4 extending into the inner side of the bottom box body 1 to prevent deformation of the first threading tube 4 during the compression molding process. At the same time, a process groove is provided on the outside of the bottom box body 1 corresponding to the reinforcing rib 15. The process groove is used to reduce the wall thickness of the reinforcing rib 12 to prevent deformation caused by excessive thickness of the reinforcing rib 12 during the cooling process of the compression molding.

[0037] The second threading tube 6 is disposed on one end of the driving box 3 away from the bottom box body 1 (disposed on the other end of the movable section 33 ), and the second threading tube 6 is cylindrical and communicates with the inside and outside of the driving box 3 .

[0038] There are zero, one, two or three first threading tubes 4 arranged on the side of the bottom box body 1; when there are zero first threading tubes 4, that is, no first threading tube 4 is arranged on the side of the bottom box body 1, the wires enter the driver box 3 and the bottom box body 1 through the second threading tube 6. This situation is suitable for the pre-buried bottom box of the downlight at this position, and no wires need to be passed, and only the downlight needs to be installed; when there is one first threading tube 4, the first threading tube 4 and the driver box 3 are symmetrically arranged or the first threading tube 4 and the driver box 3 are arranged at a 90-degree angle; when there are two first threading tubes 4, the two first threading tubes 4 are symmetrically arranged and any one of them is The first threading tube 4 is set at a 90-degree angle with the drive box 3, or the two first threading tubes 4 are set at a 90-degree angle and one first threading tube 4 is set at a 90-degree angle with the drive box 3; when there are three first threading tubes 4, the first one is set at a 90-degree angle with the second first threading tube 4, the third first threading tube 4 is set at a 90-degree angle with the first or second first threading tube 4, and the third first threading tube 4 is set at a 90-degree angle with the drive box 3; the one, two or three first threading tubes 4 are set to facilitate the wires to pass through the bottom box body 1 to connect multiple pre-buried bottom boxes or other electrical boxes;

[0039] It should be noted that: the drawings in the specification only show the specific drawings when there are three first threading tubes 4 arranged on the side of the bottom box body 1. When the first threading tubes 4 are zero, one or two, it is only necessary to subtract the corresponding number of first threading tubes 4 from the three first threading tubes 4. The situation where there are one or two first threading tubes 4 can be associated with the drawings in the specification of the patent and the above statements, and it is easy for technicians in this field to understand and implement, so it will not be repeated.

[0040] It should also be noted that the position of the first wire threading tube 4 does not correspond to the mounting hole 111 in the vertical direction, in order to prevent the first wire threading tube 4 from affecting the operating space when installing fixing screws or fixing nails into the mounting hole 111; when installing the downlight, the clamp arm spring buckle is in close contact with the inner wall surface of the base box body 1, and the downlight is stably installed in the embedded base box through the rebound force of the clamp arm spring buckle itself and the friction between the clamp arm spring buckle and the base box body 1.

[0041] Refer to the instruction manual Figure 1-3 , an end cap 5 which is the same in number as the first threading tube 4 is detachably mounted on the outer end opening of the first threading tube 4, the end cap 5 comprises a cover plate and a plugging sleeve, the cover plate is a circular plate which is the same in size as the outer diameter of the first threading tube 4, the plugging sleeve is a cylinder which is arranged at the bottom of the cover plate and is perpendicular to the cover plate, the outer diameter of the plugging sleeve is less than or equal to the inner diameter of the first threading tube 4, the end cap 5 is matched with the plugging sleeve and is inserted into the first threading tube 4 to realize a fixed and sealed connection with the first threading tube 4; specifically, the end cap 5 can be a soft rubber plug; the end cap 5 can facilitate the selective use of the first threading tube 4, and the first threading tube 4 which is not needed to be used can be closed by the end cap 5 to prevent concrete from entering the inner cavity of the bottom box body 1 from the first threading tube 4 when the floor is poured;

[0042] When the first wire threading tube 4 is in use, the first wire threading tube 4 is sleeved with the wire conduit, and the wires pass through the wire conduit and the first wire threading tube 4 in turn, then enter the bottom box body 1 and are connected to the downlight power cord. At the same time, the first wire threading tube 4 is arranged to facilitate the wires to pass through the bottom box body 1 to connect multiple pre-buried bottom boxes or other electrical boxes; because the driving power supply needs to be placed in the driving box 3, the second wire threading tube 6 needs to be sleeved with the wire conduit, and the wires pass through the wire conduit and the second wire threading tube 6 in turn, then enter the driving box 3 and are connected to the downlight power cord. Therefore, the end cover 5 is not provided at the outer end opening of the second wire threading tube 6.

[0043] At the same time, in order to facilitate the placement of the driving power supply into the driving box 3 , the inner wall surface of the bottom box body 1 and the bottom surface of the driving box 3 form an arc-shaped transition surface 15 . Example

[0044] The inventor considers that when the pre-buried bottom box of the downlight in Example 1 is used to install a spotlight with an external driving power supply, it may be necessary to rotate the spotlight to adjust the projection direction of the spotlight, and the inner end of the first threading tube 4 of the pre-buried bottom box of the downlight in Example 1 extends into the inner cavity of the bottom box body 1, and the outer end extends toward the outside, and a reinforcing rib 12 is provided on the inner side of the bottom box body 1 and between the first threading tube 4 and the inner wall of the bottom box body 1. Figure 4 It can be seen intuitively that the first threading tube 4 and the reinforcing rib 12 protrude from the inner wall of the bottom box body 1, which divides the inner wall of the bottom box body 1 into multiple areas. Since the clamp arm spring buckle of the spotlight conflicts with the inner wall of the bottom box body 1, when the spotlight needs to be rotated, the clamp arm spring buckle can only rotate in the area between the adjacent first threading tube 4 and the reinforcing rib 12, which limits the rotation range of the spotlight. Therefore, in order to solve the above problem,

[0045] Based on Example 1, and with reference to the attached Figure 5-8 The inner end of the first threading tube 4 is fixedly connected to the outer wall of the bottom box body 1, and the outer end extends horizontally toward the outside of the bottom box body 1. The first threading tube 4 is completely outside the bottom box body 1, and the inner wall surface of the bottom box body 1 is a complete arc-shaped inclined surface, so it will not limit the rotation range of the clamp arm spring buckle, and will not limit the rotation range of the spotlight, and the practicality is better;

[0046] A rib 14 is provided on the outside of the bottom box body 1 and between the first threading tube 4 and the outer wall of the bottom box body 1. Since the first threading tube 4 on the outside of the bottom box body 1 is longer, the rib 14 structurally reinforces the first threading tube 4 on the outside of the bottom box body 1 to prevent deformation of the first threading tube 4 during the molding process.

[0047] It should be noted that the only difference between the pre-buried base box for downlights in Example 1 and Example 2 is that the connection relationship of the first wire threading tube 4 arranged on the base box body 1 is different. In Example 1, the inner end of the first wire threading tube 4 extends into the inner cavity of the base box body 1, and the outer end extends toward the outside. In Example 2, the inner end of the first wire threading tube 4 is fixedly connected to the outer wall of the base box body 1, and the outer end extends horizontally toward the outside of the base box body 1. The positions, connection structures, functions, etc. of other components of the pre-buried base box for downlights are the same, so they will not be repeated.

[0048] The method for using the pre-buried bottom box of the downlight in the present patent is as follows: before pouring the floor slab concrete, 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, and the pre-buried bottom box is placed in the corresponding position. The pre-buried bottom box is fixed to the corresponding position on the building formwork by passing the fixing screws or fixing nails through the installation holes 111. The upper cover 2 closes the top opening of the downlight buckle socket 12, and the fixed section 32 and the movable section 33 of the drive box 3 are sleeved. The fixed section 32 and the movable section 33 can be glued and sealed by glue. The first wire threading tube 4 is selectively used according to the number of wires that need to be connected to the pre-buried bottom box, and the wires in the floor slab are all worn in the wire conduit pre-buried in the floor slab. The wire conduit is sleeved with the first wire threading tube 4 and the second wire threading tube 6, and the wire conduit is glued The wire duct is glued and sealed with the first wire threading tube 4, and the wire duct is glued and sealed with the second wire threading tube 6. The first wire threading tube 4 that is not needed is closed with the end cover 5. When the floor slab is poured and dried, the building formwork is removed from the floor slab, so that the opening at the bottom of the pre-buried bottom box is exposed to the outside. When installing the downlight, the worker first connects the power cord of the downlight driving power supply to the wire inside the pre-buried bottom box 1 or the driving box 3, and then inserts the driving power supply into the driving box 3. The worker then pinches the clamping arm spring buckles on both sides of the downlight body to make it upright, and then inserts the downlight from the bottom of the pre-buried bottom box. When most of the clamping arm spring buckles enter the pre-buried bottom box, the clamping arm spring buckles are released. The clamping arm spring buckles rebound under the action of their own elastic force and collide with the inclined surface inside the pre-buried bottom box. Finally, the downlight is completely pushed into the pre-buried bottom box, and the installation of the downlight is completed.

[0049] It should also be noted that: although the name of this patent is pre-buried base box for downlights, since some spotlights and downlights are similar in shape and structure and both include products with external driving power supplies, the pre-buried base box for downlights in this patent is suitable for the installation and use of spotlights and downlights.

[0050] Obviously, it is possible to modify and / or add components to the above-mentioned pre-buried bottom box of downlight and the corresponding method without departing from the field and scope of the present utility model.

[0051] It is also clear that although the present utility model has described the downlight embedded base box in detail, technicians in this field will certainly be able to obtain many other equivalent forms of downlight embedded base boxes and corresponding methods. The downlight embedded base box and the corresponding method have the characteristics as described in the claims and are therefore within the scope of the protection field defined thereby.

Claims

1. A pre-buried bottom box for a downlight, characterized by: The invention comprises a bottom box body (1), an upper cover (2), a drive box (3) and a second threading tube (6); the bottom box body (1) is a cylindrical structure with a hollow interior and openings at the top and bottom ends; the upper cover (2) is installed at the top opening of the bottom box body (1) and is used to close the top opening of the bottom box body (1); The drive box (3) is fixed and horizontally arranged on the side of the base box body (1); the drive box (3) is a hollow structure; a through groove (13) is arranged at the connection between the drive box (3) and the base box body (1) to connect the inner cavity of the base box body (1) with the inner cavity of the drive box (3); the second threading tube (6) is arranged at the other end of the drive box (3); the second threading tube (6) is cylindrical, and the second threading tube (6) is connected to the inside and outside of the drive box (3).

2. The pre-buried bottom box of downlight according to claim 1 is characterized in that: The pre-buried base box of the downlight further comprises a first threading tube (4) and an end cover (5); at least one of the first threading tubes (4) is fixed and horizontally arranged on the side of the base box body (1); the first threading tube (4) is cylindrical; the first threading tube (4) is connected to the inside and outside of the base box body (1); and the end covers (5) whose number is the same as the number of the first threading tubes (4) are detachably mounted on the outer end opening of the first threading tube (4).

3. The pre-buried bottom box of downlight according to claim 2 is characterized in that: The inner end of the first threading tube (4) extends into the inner cavity of the bottom box body (1), and the outer end extends horizontally toward the outside of the bottom box body (1), and a reinforcing rib (12) is provided on the inner side of the bottom box body (1) and between the first threading tube (4) and the inner wall of the bottom box body (1); or, the inner end of the first threading tube (4) is fixedly connected to the outer wall of the bottom box body (1), and the outer end extends horizontally toward the outside of the bottom box body (1), and a rib plate (14) is provided on the outer side of the bottom box body (1) and between the first threading tube (4) and the outer wall of the bottom box body (1).

4. The pre-buried bottom box of downlight according to claim 1 is characterized in that: The bottom box body (1) is in the shape of a truncated cone as a whole, the diameter of the top opening is larger than the diameter of the bottom opening, and the inner wall surface of the bottom box body (1) is an arc-shaped inclined surface.

5. The pre-buried bottom box of downlight according to claim 2 is characterized in that: There is one, two or three first threading tubes (4) arranged on the side of the bottom box body (1); when there is one first threading tube (4), the first threading tube (4) and the drive box (3) are symmetrically arranged or the first threading tube (4) and the drive box (3) are arranged at a 90-degree angle; when there are two first threading tubes (4), the two first threading tubes (4) are symmetrically arranged and any one of the first threading tubes (4) and the drive box (3) is arranged at a 90-degree angle, or the two first threading tubes (4) are arranged at a 90-degree angle and one first threading tube (4) and the drive box (3) is arranged at a 90-degree angle; when there are three first threading tubes (4), the first one is arranged at a 90-degree angle with the second first threading tube (4), the third first threading tube (4) is arranged at a 90-degree angle with the first or second first threading tube (4), and the third first threading tube (4) and the drive box (3) are arranged at a 90-degree angle.

6. The pre-buried bottom box of downlight according to claim 1, characterized in that: The drive box (3) comprises a fixed section (32), a movable section (33) and a connection structure for detachably connecting the movable section (33) to the end of the fixed section (32); the connection structure comprises a sleeve frame (321) arranged at the end of the fixed section (32) and a sleeve groove (331) arranged at the end of the movable section (33); the sleeve frame (321) extends out of the end of the fixed section (32); the sleeve groove (331) is arranged on the inner side of the end of the movable section (33); the sleeve frame (321) can be matched and sleeved in the sleeve groove (331); and the second threading tube (6) is arranged at the other end of the movable section (33).

7. The pre-buried bottom box of downlight according to claim 1, characterized in that: A support plate (31) is fixedly arranged at the bottom of the drive box (3), and the bottom surface of the support plate (31) is flush with the bottom surface of the bottom box body (1).

8. The pre-buried bottom box of downlight according to claim 1, characterized in that: The bottom box body (1) further comprises a mounting base (11), the mounting base (11) being fixedly mounted on the bottom edge of the bottom box body (1), and a plurality of mounting holes (111) being arranged at equal distances on the mounting base (11).

9. The pre-buried bottom box of downlight according to claim 1, characterized in that: The upper cover (2) and the bottom box body (1) are of an integral structure and are integrally formed, or the upper cover (2) and the bottom box body (1) are of a split structure, and the upper cover (2) is detachably mounted on the top opening of the bottom box body (1).

10. The pre-buried bottom box of downlight according to claim 1, characterized in that: The inner wall surface of the bottom box body (1) and the bottom surface of the drive box (3) form an arc-shaped transition surface (15).

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