A split ceiling lamp installation base and a ceiling lamp

Abstract

The present invention relates to the field of lamps, and discloses a split ceiling lamp mounting base and a ceiling lamp, which include a hanging plate connected to the ceiling and a chassis connected to the lamp. The connection between the joint surfaces of the hanging plate and the chassis is achieved through at least one set of screw-in power connection components arranged in the circumferential direction. Each set of screw-in power connection components includes 2 or 3 screw-in power connection units, and the concentric radii of each screw-in power connection unit are different from each other. Through the arrangement of different radii with the same center for each screw-in power connection unit, the present invention can achieve quick installation and fixation of the lamp by using a one-to-one position pairing method. There is no need to use plug-in or crimping processes to connect wires between the hanging plate and the chassis. Moreover, the live wire, neutral wire, and ground wire of the lamp can be accurately positioned according to different concentric radii, which can eliminate the possibility of wrong connection and facilitate the installation operation at high altitude.

Description

Technical Field

[0001] The present invention relates to the technical field of lamps, and particularly to a split ceiling lamp mounting base and a ceiling lamp. Background Art

[0002] A ceiling lamp is a lighting and modern decorative lamp with a noble grade, and is very suitable for shopping malls, supermarkets, hotels, jewelry counters and high-grade homes. However, the existing ceiling lamps usually directly install the lamps on the ceiling. This installation method has cumbersome installation procedures and difficult positioning, resulting in a long installation time, troublesome installation, inconvenient high-altitude installation operations. And when subsequent maintenance or replacement is required, the ceiling lamp needs to be disassembled, and it is necessary to perform destructive disassembly, such as: removing the entire ceiling or aluminum ceiling piece by piece, but this will cause damage to the ceiling and the ceiling lamp, and it is not convenient to disassemble the ceiling lamp. Users cannot replace different lamps at any time according to usage requirements. Summary of the Invention

[0003] The object of the present invention is to provide a split ceiling lamp mounting base and a ceiling lamp, which can achieve rapid installation and fixation of the lamp, facilitate high-altitude installation operations, facilitate replacement, and the lamp can be freely switched at any time, which is beneficial to modular design, sales and maintenance.

[0004] In order to solve the above technical problems, the present invention provides a split ceiling lamp mounting base, which includes a hanging plate connected to the ceiling and a chassis connected to the lamp. The connection between the joint surfaces of the hanging plate and the chassis is realized through at least one set of screw-in power connection components arranged in the circumferential direction. Each set of the screw-in power connection components includes 2 or 3 screw-in power connection units, and the concentric radii of each screw-in power connection unit are different from each other.

[0005] As a preferred solution of the present invention, the screw-in power connection unit includes a hook groove, a hook, a wiring terminal and a conductive insert. The hook groove is arranged on the lower end surface of the hanging plate, and the hook groove is an arc groove. The wiring terminal is arranged on one side of the limiting end of the hook groove and is connected to the power supply through a wire; the hook is arranged on the upper end surface of the chassis and is screwed and buckled with the hook groove. The conductive insert is arranged on one side where the hook is screwed into the hook groove and can contact and conduct with the wiring terminal, and the conductive insert is connected to the lamp board through a wire.

[0006] As a preferred solution of the above split ceiling lamp mounting base, the outer shape of the hanging plate is circular, the chassis is provided with a circular groove matching the outer shape of the hanging plate, and the hook is located in the circular groove.

[0007] As a preferred solution for the above-mentioned split ceiling lamp installation base, the chassis is provided with sockets equal in number to the hooks and into which the conductive inserts can be plugged. The upper end of the conductive insert passes through the socket and extends to one side of the hook groove where the hook is screwed in, and the lower end of the conductive insert extends out and is connected to the lamp panel through a wire.

[0008] As a preferred solution for the above-mentioned split ceiling lamp installation base, the screw-in power connection unit includes a hook groove, a hook, a terminal block, and a conductive insert. The hook groove is provided on the upper end face of the chassis, and the hook groove is an arc groove. The terminal block is arranged on one side of the limiting end of the hook groove and is connected to the lamp panel through a wire; the hook is arranged on the lower end face of the hanging plate and is screwed and fastened with the hook groove. The conductive insert is arranged on one side of the hook that is screwed into the hook groove and can be in contact and conduct with the terminal block, and the conductive insert is connected to the power supply through a wire.

[0009] As a preferred solution for the above-mentioned split ceiling lamp installation base, the hanging plate is provided with sockets equal in number to the hooks and into which the conductive inserts can be plugged. The lower end of the conductive insert passes through the socket and extends to one side of the hook groove where the hook is screwed in, and the upper end of the conductive insert extends out and is connected to the power supply through a wire.

[0010] As a preferred solution for the above-mentioned split ceiling lamp installation base, each pair of the terminal block and the conductive insert are sequentially in contact and conduct along the screwing-in direction of the hook.

[0011] As a preferred solution for the above-mentioned split ceiling lamp installation base, a positioning groove is provided in the middle of the lower end face of the hanging plate, and a positioning boss corresponding to the positioning groove is provided in the middle of the upper end face of the chassis. The positioning groove and the positioning boss are in shape fit and can rotate relative to each other.

[0012] As a preferred solution for the above-mentioned split ceiling lamp installation base, a plurality of mounting holes through which screws can pass and fix the hanging plate to the ceiling are provided in the positioning groove.

[0013] As a preferred solution for the above-mentioned split ceiling lamp installation base, the connection between the conductive insert and the terminal block is a plug-in connection.

[0014] As a preferred solution for the above-mentioned split ceiling lamp installation base, the top surfaces of each hook are located in the same plane, and the top surface of the positioning boss is higher than the top surface of the hook.

[0015] Implementing the split ceiling lamp mounting base provided by the present invention, compared with the prior art, its beneficial effects are as follows: By arranging the concentric and different-radius screw-in power connection units, and using the one-to-one position pairing method, it can achieve quick installation and fixation of the lamp. At the same time, there is no need to use plug-in or crimping processes to connect the wires between the hanging plate and the chassis. Moreover, the live wire, neutral wire, and ground wire of the lamp can be accurately positioned according to different concentric radii, which can eliminate the possibility of incorrect connection and facilitate the climbing installation operation. In addition, after using the above split ceiling lamp mounting base, the lamp can be freely switched at any time, which is beneficial for modular design, sales, and maintenance.

[0016] In addition, the present invention also provides a ceiling lamp, which includes a lamp and the split ceiling lamp mounting base described in the above contents. The lamp includes a lamp body and a lampshade. The chassis is connected to the back of the lamp body, and the lampshade is fixed to the front of the lamp body through a plurality of hook connection components. The hook connection components include a connection pin and a rotating hook. The connection pin passes through the back of the lamp body and is connected to the rotating hook. The connection pin is provided with a head for only a screwdriver to apply force for rotation.

[0017] As a preferred solution of the above ceiling lamp, the back of the lamp body is provided with a pin hole for the connection pin. The diameter of the head is larger than the aperture of the pin hole. One end of the connection pin close to the head is provided with a radial protrusion, and the wall of the pin hole is provided with a limiting groove for the radial protrusion to rotate.

[0018] Implementing the ceiling lamp provided by the present invention, compared with the prior art, its beneficial effects are as follows: While having all the beneficial effects of the above split ceiling lamp mounting base, it also improves the use safety of the user terminal by setting the hook connection components so that the lampshade cannot be disassembled by hand, and the connection structure between the lampshade and the lamp body is stable and reliable. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 is a schematic structural diagram of an embodiment of the split ceiling lamp mounting base;

[0020] Figure 2 is a schematic structural diagram of another embodiment of the split ceiling lamp mounting base;

[0021] Figure 3 is of [[ID=**]] Figure 1 a schematic structural diagram of another view direction of the hanging plate shown;

[0022] Figure 4 is of Figure 1 a schematic structural diagram of another view direction of the chassis shown;

[0023] Figure 5 is a schematic structural diagram when the chassis is provided with a circular groove;

[0024] Figure 6 It is a structural schematic diagram of a split ceiling lamp installation base when there are 3 hooks and 6 hook slots;

[0025] Figure 7a It is a schematic diagram of the connection between the conductive insert and the terminal Figure 1 ;

[0026] Figure 7b It is a schematic diagram of the connection between the conductive insert and the terminal Figure 2 ;

[0027] Figure 7c It is a schematic diagram of the connection between the conductive insert and the terminal Figure 3 ;

[0028] Figure 8 It is a diagram of the usage state of the ceiling lamp;

[0029] Figure 9 It is an exploded view of the ceiling lamp;

[0030] Figure 10 It is a structural schematic diagram of the connecting pin;

[0031] Figure 11 It is a structural schematic diagram of the pin hole;

[0032] In the figure: 1. Hanging plate, 11. Positioning groove, 12. Mounting hole, 2. Chassis, 21. Circular groove, 22. Jack, 23. Positioning boss, 31. Hook slot; 32. Hook; 33. Terminal; 34. Conductive insert, 4. Electric wire, 5. Lamp body, 51. Pin hole, 52. Limit groove, 6. Lamp cover, 7. Hook connection component, 71. Connecting pin, 72. Rotating hook, 73. Head, 74. Radial protrusion. Specific embodiments

[0033] The following will further describe in detail the specific embodiments of the present invention in conjunction with the accompanying drawings and embodiments. The following embodiments are used to illustrate the present invention, but are not used to limit the scope of the present invention.

[0034] In the description of the present invention, it should be understood that unless otherwise clearly specified and limited, the terms "installation", "connection", and "connection" used in the present invention should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific situations.

[0035] Refer to Figure 1 and Figure 2The embodiment of the present invention provides a split-type ceiling lamp mounting base, which includes a hanging plate 1 connected to the ceiling and a chassis 2 connected to the lamp. The joint surfaces of the hanging plate 1 and the chassis 2 are connected by at least one group of screw-on electrical connection components arranged in a circumferential direction. Each group of the screw-on electrical connection components includes 2 or 3 screw-on electrical connection units, and the concentric radius of each screw-on electrical connection unit is different. Therefore, the present invention can achieve rapid installation and fixation of the lamp by arranging the different radii of the concentric center of each screw-on electrical connection unit and utilizing a one-to-one position pairing method. At the same time, there is no need to use a plug-in or crimping process to connect the wires between the hanging plate 1 and the chassis 2, and the live wire, neutral wire and ground wire of the lamp can be accurately positioned according to different concentric radii, which can eliminate the possibility of wrong connection and facilitate high-altitude installation operations. In addition, after using the above-mentioned split-type ceiling lamp mounting base, the lamp can be freely switched at any time, which is conducive to modular design, sales and maintenance. Specific implementation method 1

[0037] like Figure 1 、 Figure 3 and Figure 4 As shown, the screw-on power connection unit includes a hook slot 31, a hook 32, a terminal 33, and a conductive plug 34. The hook slot 31 is provided on the lower end surface of the hanging plate 1. The hook slot 31 is an arc slot. The terminal 33 is provided on the side of the limit end of the hook slot 31 and is connected to the power supply through the wire 4. The hook 32 is provided on the upper end surface of the chassis 2 and is screwed and buckled with the hook slot 31. The conductive plug 34 is provided on the side where the hook 32 is screwed into the hook slot 31 and can be in contact with the terminal 33 for conduction. The conductive plug 34 is connected to the light board through the wire. The cross-section of the hook 32 is L-shaped or T-shaped, but not limited thereto. Therefore, when the hook 32 is screwed into the hook slot 31 to the limit end, the conductive plug just contacts and conducts with the terminal.

[0038] Exemplarily, each pair of the wiring terminals 33 and the conductive inserts 34 sequentially contact and connect along the screwing direction of the hook 32. In an optional embodiment, the wiring terminals 33 can be divided into live terminals, neutral terminals, and ground terminals, and correspondingly, the conductive inserts 34 can be divided into live conductive inserts, neutral conductive inserts, and ground conductive inserts. That is, when the hook 32 is screwed into the hook slot 31, the ground terminal and the ground conductive insert contact and connect first, followed by the neutral terminal and the neutral conductive insert, and finally the live terminal and the live conductive insert. This design can effectively prevent electric shock caused by power connection during assembly, providing high safety.

[0039] For example, Figure 5As shown, the outer shape of the hanging plate 1 is circular. The chassis 2 is provided with a circular groove 21 that matches the outer shape of the hanging plate 1, and the hook 32 is located within the circular groove 21. With such a design, the chassis 2 can be sleeved on the hanging plate 1, enabling the chassis 2 to only rotate circumferentially around the central axis of the hanging plate 1, thereby defining the movement trajectory of the hook 32 and facilitating the quick screwing of the hook 32 into the hook slot 31 for easy installation. In addition, since the hanging plate 1 is hidden within the circular groove 21 of the chassis 2, the overall appearance is good.

[0040] Exemplarily, as Figure 1 shown, a positioning groove 11 is provided in the middle of the lower end face of the hanging plate 1, and a positioning boss 23 corresponding to the positioning groove 11 is provided in the middle of the upper end face of the chassis 2. The positioning groove 11 and the positioning boss 23 are in shape fit and can rotate relative to each other. With such a design, during installation, the positioning boss 23 of the chassis 2 can be aligned with the positioning groove 11 of the hanging plate, enabling the chassis 2 to only rotate circumferentially around the central axis of the positioning groove 11 or the positioning boss 23, defining the movement trajectory of the hook 32 and facilitating the quick screwing of the hook 32 into the hook slot 31 for easy installation.

[0041] Exemplarily, as Figure 1 shown, the top surfaces of each of the hooks 32 are located in the same plane. During installation, the top surface of the hook 32 can abut against the end face of the hanging plate 1 and rotate, which is beneficial for the hook 32 to be screwed into the hook slot 31. Further, to ensure the positioning effect between the positioning boss 23 and the positioning groove 11, the top surface of the positioning boss 23 is higher than the top surface of the hook 32.

[0042] Exemplarily, as Figure 1 shown, for the convenience of loading and unloading the hanging plate 1, a plurality of mounting holes 12 through which screws can pass to fix the hanging plate 1 to the ceiling are provided in the positioning groove 11.

[0043] Exemplarily, as Figure 1 and Figure 4 shown, for the convenience of installing the conductive insert 34, the chassis 2 is provided with sockets 22 that are equal in number to the hooks 32 and into which the conductive insert 34 can be inserted. The upper end of the conductive insert 34 passes through the socket 22 and extends to one side where the hook 32 is screwed into the hook slot 31, and the lower end of the conductive insert 34 extends out and is connected to the lamp board through a wire 4.

[0044] Exemplarily, the conductive insert 34 and the terminal 33 are in a pluggable connection, and its specific form: as Figures 7a - 7c shown in the figure.

[0045] In addition, in each set of the screwed electrical connection components, there are 2 or 3 hooks 32, and the number of hook slots 31 is an integer multiple of the number of hooks 32. As Figure 6As shown, there are 3 hooks 32 and 6 hook slots 31. With such a design, it is possible to find the matching positions of the hook 32 and the hook slot 31 with a smaller rotation angle.

[0046] It should also be noted that when each set of the screwed electrical connection components includes 2 screwed electrical connection units, the corresponding 2 wiring terminals 33 or conductive inserts 34 are respectively connected to the live wire and the neutral wire of the power supply; when each set of the screwed electrical connection components includes 3 screwed electrical connection units, the corresponding 3 wiring terminals 33 or conductive inserts 34 are respectively connected to the live wire, the neutral wire and the ground wire of the power supply. Specific Embodiment 2

[0048] As Figure 2 As shown, the screwed electrical connection unit includes a hook slot 31, a hook 32, a wiring terminal 33 and a conductive insert 34. The hook slot 31 is arranged on the upper end surface of the chassis 2. The hook slot 31 is an arc slot. The wiring terminal 33 is arranged on one side of the limiting end of the hook slot 31 and is connected to the lamp board through a wire; the hook 32 is arranged on the lower end surface of the hanging board 1 and is screwed and buckled with the hook slot 31. The conductive insert 34 is arranged on one side where the hook 32 is screwed into the hook slot 31 and can contact and conduct with the wiring terminal 33. And the conductive insert 34 is connected to the power supply through a wire 4. Among them, the cross-section of the hook 32 is L-shaped or T-shaped, but not limited thereto. Thus, when the hook 32 is screwed into the hook slot 31 to the limiting end, the conductive insert just contacts and conducts with the wiring terminal.

[0049] Exemplarily, each pair of the wiring terminal 33 and the conductive insert 34 are sequentially in contact and conduction along the screwing-in direction of the hook 32. In an optional embodiment, the wiring terminal 33 can be divided into a live wire terminal, a neutral wire terminal and a ground wire terminal. Correspondingly, the conductive insert 34 can be divided into a live wire conductive insert, a neutral wire conductive insert and a ground wire conductive insert. That is, when the hook 32 is screwed into the hook slot 31, the ground wire terminal and the ground wire conductive insert are preferentially in contact and conduction, then the neutral wire terminal and the neutral wire conductive insert are in contact and conduction, and finally the live wire terminal and the live wire conductive insert are in contact and conduction. With such a design, it can effectively prevent the problem of electric shock caused by the power supply being connected during assembly, and has high safety.

[0050] Exemplarily, as Figure 2As shown, a positioning groove 11 is provided in the middle of the lower end face of the hanging plate 1, and a positioning boss 23 corresponding to the positioning groove 11 is provided in the middle of the upper end face of the chassis 2. The positioning groove 11 and the positioning boss 23 are in shape fit and can rotate relative to each other. With such a design, during installation, the positioning boss 23 of the chassis 2 can be aligned with the positioning groove 11 of the hanging plate, so that the chassis 2 can only rotate circumferentially around the central axis of the positioning groove 11 or the positioning boss 23, limiting the movement track of the hook 32 and enabling the hook 32 to quickly screw into the hook groove 31, which is convenient for installation.

[0051] Exemplarily, as Figure 2 shown, the top surfaces of each hook 32 are located in the same plane. During installation, the top surface of the hook 32 can abut against the end face of the chassis 2 and rotate, which is beneficial for the hook 32 to screw into the hook groove 31. Further, to ensure the positioning effect between the positioning boss 23 and the positioning groove 11, the top surface of the positioning boss 23 is higher than the top surface of the hook 32.

[0052] Exemplarily, as Figure 2 shown, for the convenience of installing the conductive insert 34, the hanging plate 1 is provided with insertion holes 22 that are equal in number to the hooks 32 and into which the conductive insert 34 can be inserted. The lower end of the conductive insert 34 passes through the insertion hole 22 and extends to one side where the hook 32 screws into the hook groove 31, and the upper end of the conductive insert 34 extends out and is connected to a power source through a wire 4.

[0053] Exemplarily, as Figure 2 shown, for the convenience of loading and unloading the hanging plate 1, a plurality of installation holes 12 through which screws can pass and fix the hanging plate 1 to the ceiling are provided in the positioning groove 11.

[0054] Exemplarily, the conductive insert 34 and the wiring terminal 33 are in a pluggable connection, and its specific form: as Figures 7a - 7c shown in the figure.

[0055] Exemplarily, the top surfaces of each hook 32 are located in the same plane; thus, during installation, the top surface of the hook 32 can abut against the end face of the hanging plate 1 or the chassis 2 and rotate, which is beneficial for the hook 32 to screw into the hook groove 31.

[0056] In addition, in each set of the screwed electrical connection components, 2 or 3 hooks 32 are provided, and the number of hook grooves 31 is an integer multiple of the number of hooks 32. As Figure 6 shown, 3 hooks 32 are provided and 6 hook grooves 31 are provided. With such a design, the pairing positions of the hook 32 and the hook groove 31 can be found with a smaller rotation angle.

[0057] It should also be noted that when each set of the screwed electrical connection components includes 2 screwed electrical connection units, the corresponding 2 terminal blocks 33 or conductive inserts 34 are respectively connected to the live wire and the neutral wire of the power supply; when each set of the screwed electrical connection components includes 3 screwed electrical connection units, the corresponding 3 terminal blocks 33 or conductive inserts 34 are respectively connected to the live wire, the neutral wire and the ground wire of the power supply.

[0058] Such as Figure 8 and Figure 9 , based on the above-mentioned split ceiling lamp mounting base, an embodiment of the present invention further provides a ceiling lamp, which includes a lamp and the split ceiling lamp mounting base described in the above contents. The lamp includes a lamp body 5 and a lamp cover 6. The chassis 2 is connected to the back of the lamp body 5. The lamp cover 6 is fixed to the front of the lamp body 5 through a plurality of hook connection components 7. The hook connection component 7 includes a connection pin 71 and a rotating hook 72. The connection pin 71 passes through the back of the lamp body 5 and is connected to the rotating hook 72. The connection pin 71 is provided with a head 73 for applying force and rotation only by a screwdriver. Since the ceiling lamp includes the above-mentioned split ceiling lamp mounting base, the ceiling lamp has all the beneficial effects of the above-mentioned split ceiling lamp mounting base; at the same time, the ceiling lamp also improves the use safety of the user terminal by setting the hook connection component 7 so that the lamp cover 6 cannot be disassembled by hand, and the connection structure between the lamp cover 6 and the lamp body 5 is stable and reliable.

[0059] Exemplarily, such as Figure 10 and Figure 11 , a pin hole 51 for the connection pin 71 is provided on the back of the lamp body 5. The diameter of the head 73 is larger than the aperture of the pin hole 51. A radial protrusion 74 is provided at one end of the connection pin 71 close to the head 73. A limiting groove 52 for 180-degree rotation of the radial protrusion (74) is provided on the hole wall of the pin hole 51. Such a design can lock the lamp cover more accurately and is convenient for installation.

[0060] The above are only the preferred embodiments of the present invention. It should be noted that for those of ordinary skill in the art, without departing from the technical principle of the present invention, several improvements and replacements can be made, and these improvements and replacements should also be regarded as the protection scope of the present invention.

Claims

1. A split ceiling lamp mounting base, characterized in that: The lamp comprises a hanging plate connected to the ceiling and a chassis connected to the lamp, wherein the joint surfaces of the hanging plate and the chassis are connected by at least one group of rotating electrical connection components arranged along the circumferential direction, each group of the rotating electrical connection components comprises three rotating electrical connection units, and the concentric radius of each rotating electrical connection unit is different from each other; the rotating electrical connection unit comprises a hook groove, a hook, a wiring terminal and a conductive plug, the hook groove is arranged on the lower end surface of the hanging plate, the hook groove is an arc groove, the wiring terminal is arranged on one side of the limit end of the hook groove and is connected to the power supply through an electric wire; the hook is arranged on the upper end surface of the chassis and is screwed and buckled with the hook groove, the conductive plug is arranged on the side where the hook is screwed into the hook groove, and can be connected with the The wiring terminals are in contact and conductive, and the conductive plug is connected to the lamp board through an electric wire; a positioning groove is provided in the middle of the lower end surface of the hanging plate, and a positioning boss corresponding to the positioning groove is provided in the middle of the upper end surface of the chassis, and the positioning groove and the positioning boss are matched in shape and can rotate relative to each other; a plurality of mounting holes are provided in the positioning groove for screws to pass through and fix the hanging plate to the ceiling; the top surface of each of the hooks is located in the same plane, and the top surface of the positioning boss is higher than the top surface of the hook; the three screw-on power connection units correspond to the ground wire, the neutral wire and the live wire respectively, and each pair of the wiring terminals and the conductive plug are in contact and conductive in sequence along the screwing direction of the hook, and the phase wires corresponding to the order of contact and conduction are the ground wire, the neutral wire and the live wire respectively.

2. The split ceiling lamp mounting base according to claim 1, characterized in that: The outer shape of the hanging plate is circular, the chassis is provided with a circular groove matching the outer shape of the hanging plate, and the hook is located in the circular groove.

3. The split ceiling lamp mounting base according to claim 1, characterized in that: The chassis is provided with sockets equal in number to the hooks and capable of receiving the conductive plugs. The upper ends of the conductive plugs pass through the sockets and extend to one side of the hook where the hook is screwed into the hook slot. The lower ends of the conductive plugs extend out and are connected to the light board via wires.

4. A ceiling lamp, characterized in that: It comprises a lamp and a split ceiling lamp mounting base as described in any one of claims 1 to 3, wherein the lamp comprises a lamp body and a lampshade, the chassis is connected to the back of the lamp body, the lampshade is fixed to the front of the lamp body by a plurality of hook connection components, the hook connection components comprise a connecting pin and a rotating hook, the connecting pin passes through the back of the lamp body and is connected to the rotating hook, and the connecting pin is provided with a head that is only used for rotation by applying force with a screwdriver.

5. The ceiling lamp according to claim 4, characterized in that: The back of the lamp body is provided with a pin hole for the connecting pin, the diameter of the head is larger than the aperture of the pin hole, the connecting pin is provided with a radial protrusion at one end close to the head, and the hole wall of the pin hole is provided with a limiting groove for the radial protrusion to rotate.

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