Projection device

Abstract

The utility model discloses projection equipment which comprises a projector body and a support assembly, the projector body is rotatably connected to the support assembly, a main control board is arranged in the projector body, a wire holder electrically connected with the main control board is arranged on one side of the support assembly away from the projector body, and the wire holder is connected with the main control board. The wire holder is located on the rotation axis of the projector body relative to the support assembly. According to the projection equipment provided by the utility model, the influence of the acting force on the projector body when the electric wire is bent and twisted is reduced to the greatest extent.

Description

Technical Field

[0001] The utility model relates to the technical field of projection equipment, in particular to a projection equipment. Background Art

[0002] For projection equipment with a rotating pan-tilt head, the data interface is often set on the projector body. When the force brought by the data line is too large, it may cause the projector body to rotate unexpectedly relative to the pan-tilt head, causing the projector body to deviate from the projection angle pre-adjusted by the user. In particular, when a large number of data interfaces are set on the projector body, the force brought by each data line will make the above problem more obvious, resulting in a poor user experience. Utility Model Content

[0003] In order to solve the above technical problems, the utility model provides a projection device, which minimizes the influence of the force exerted on the projector body when the wires are bent and twisted.

[0004] The wiring socket no longer rotates with the projector body, which can prevent the data cable from loosening, falling off or being damaged when the projector body rotates at a large angle.

[0005] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0006] The utility model discloses a projection device, comprising a projector body and a bracket assembly, wherein the projector body is rotatably connected to the bracket assembly, a main control board is arranged in the projector body, a wiring socket electrically connected to the main control board is arranged on a side of the bracket assembly away from the projector body, and the wiring socket is located on a rotation axis of the projector body relative to the bracket assembly.

[0007] Preferably, the projection device also includes a rotating shaft, the rotating shaft includes a first connecting piece and a second connecting piece, the first connecting piece is rotatably connected to the side of the second connecting piece facing away from the projector body, and the second connecting piece is fixedly connected to the projector body, and the first connecting piece is fixedly connected to the bracket assembly, so that the projector body is rotatably connected to the bracket assembly through the rotating shaft.

[0008] Preferably, the projection device further comprises a first fastener and a second fastener, wherein:

[0009] A first assembly hole is formed on the second connecting piece, a second assembly hole is formed on the shell of the projector body, and the first fastener passes through the first assembly hole and extends into and is fixed in the second assembly hole, so as to fix the second connecting piece to the projector body;

[0010] The bracket assembly is provided with a third assembly hole, the first connecting piece is provided with a fourth assembly hole, and the second fastener passes through the third assembly hole and extends into and is fixed to the fourth assembly hole, so as to fix the first connecting piece to the bracket assembly.

[0011] Preferably, the projection device further comprises a shaft cover plate, the shaft cover plate is connected to the side of the bracket assembly away from the projector body and is located at the position of the rotation axis, and a fifth assembly hole is provided on the shaft cover plate, wherein:

[0012] The fifth assembly hole is coaxially arranged with the third assembly hole and the fourth assembly hole, and the second fastener passes through the fifth assembly hole and the third assembly hole and extends into and is fixed to the fourth assembly hole, so as to fix the first connecting piece and the rotating shaft cover plate to the bracket assembly respectively; or,

[0013] It also includes a third fastener, the fifth assembly hole is staggered with the third assembly hole, a sixth assembly hole is opened on the bracket assembly and is coaxial with the fifth assembly hole, the third fastener passes through the fifth assembly hole and extends into and is fixed to the sixth assembly hole to fix the shaft cover to the bracket assembly.

[0014] Preferably, a fixing hole is opened on the bracket assembly at the position of the rotation axis, the wiring seat includes a circuit board, the shape of the fixing hole is adapted to the shape of the circuit board so that the circuit board is fixed in the fixing hole, and the side of the circuit board facing the projector body abuts against the first connecting piece.

[0015] Preferably, at least one stopper is protruding from the hole wall of the fixing hole, and at least one slot is recessed at the edge of the circuit board, and the stopper is snapped into the slot; and / or, the shapes of the fixing hole and the circuit board are both non-circular structures.

[0016] Preferably, the wiring socket also includes a connector and a lead, the connector is arranged on the side of the circuit board facing the projector body, the lead is electrically connected to the connector, a first wiring hole is opened on the rotating shaft, and a second wiring hole is opened on the shell of the projector body, the connector extends into the first wiring hole, and the lead passes through the first wiring hole and the second wiring hole and then enters the interior of the shell of the projector body.

[0017] Preferably, the projection device also includes a hinge cover, which covers the side of the bracket assembly away from the projector body and is located at the position of the rotation axis, wherein the wiring socket includes a circuit board and a wiring port, the side of the circuit board away from the projector body abuts against the side of the hinge cover facing the projector body, the wiring port is arranged on the side of the circuit board away from the projector body, and a first through hole is opened on the hinge cover, and the wiring port extends into the first through hole to be exposed.

[0018] Preferably, the opening direction of the wiring port faces the direction away from the projector body, and the first through hole is formed at the end surface of the shaft cover away from the projector body; or,

[0019] The opening direction of the wiring port is parallel to the side of the circuit board away from the projector body, and the first through hole is opened at the side of the rotating shaft cover.

[0020] Preferably, a mounting platform is protruded from one side of the shaft cover toward the projector body, the circuit board is fixedly connected to the mounting platform, a third wiring hole is provided on the bracket assembly, and the circuit board and the mounting platform extend into the third wiring hole.

[0021] Compared with the prior art, the beneficial effects of the present invention are as follows: the projection device proposed by the present invention, wherein the wiring socket electrically connected to the main control board in the projector body is arranged on the side of the bracket assembly away from the projector body, and is located on the rotation axis of the projector body relative to the bracket assembly; through the ingenious design of the position of the wiring socket, even if the wires inserted in the wiring socket are bent and twisted, it will basically not affect the projector body; and the wiring socket will not rotate with the projector body, which can prevent the wires from loosening, falling off or being damaged when the projector body rotates at a large angle. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a schematic diagram of the structure of the projection device in the first embodiment of the present utility model;

[0023] Figure 2 yes Figure 1 An enlarged schematic diagram of the explosion structure at the rotation axis of the projector body of the projection device relative to the support arm;

[0024] Figure 3 yes Figure 1 A schematic diagram of the assembly structure of the wiring socket and the shaft cover of the projection device;

[0025] Figure 4 It is a structural schematic diagram of a bracket assembly of a projection device in Embodiment 2 of the present utility model;

[0026] Figure 5 yes Figure 4 A schematic diagram of the exploded structure of the projection device at the rotation axis where the projector body rotates relative to the support arm;

[0027] Figure 6 yes Figure 4 An enlarged schematic diagram of the explosion structure at the rotation axis of the projector body of the projection device relative to the support arm.

[0028] Description of reference numerals:

[0029] 100. Projection equipment;

[0030] 10. Projector body; 11. Second assembly hole; 12. Second wiring hole;

[0031] 20. Bracket assembly; 21. Bracket arm; 211. Third assembly hole; 212. Sixth assembly hole; 213. Fixing hole; 2131. Stopper; 214. Third wiring hole; 22. Base;

[0032] 30. Wiring base; 31. Circuit board; 311. Bayonet; 32. Connector; 33. Wiring port;

[0033] 40, rotating shaft; 41, first connecting piece; 411, fourth assembly hole; 412, top boss; 42, second connecting piece; 421, first assembly hole; 43, first wiring hole;

[0034] 51. first fastener; 52. second fastener; 53. third fastener;

[0035] 60. Rotating shaft cover plate; 61. Fifth assembly hole; 62. First through hole; 63. Mounting platform. DETAILED DESCRIPTION

[0036] The following is a detailed description of the implementation of the utility model. It should be emphasized that the following description is only exemplary and is not intended to limit the scope and application of the utility model.

[0037] It should be noted that when a component is referred to as being "fixed to" or "disposed on" another component, it can be directly on the other component or indirectly on the other component. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or indirectly connected to the other element. In addition, connection can be used for both fixing and circuit / signal communication.

[0038] It should be understood that the terms "length", "width", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the accompanying drawings, and are only for the convenience of describing the embodiments of the utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the utility model.

[0039] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of the embodiments of the present utility model, the meaning of "multiple" is two or more, unless otherwise clearly and specifically defined.

[0040] Embodiment 1

[0041] like Figures 1 to 3 As shown, the first embodiment of the utility model discloses a projection device 100, including a projector body 10 and a bracket assembly 20, the projector body 10 is rotatably connected to the bracket assembly 20, a main control board (not shown) is provided in the projector body 10, and a terminal socket 30 electrically connected to the main control board is provided on the side of the bracket assembly 20 away from the projector body 10, and the terminal socket 30 is located on the rotation axis of the projector body 10 relative to the bracket assembly 20.

[0042] In this embodiment, in addition to the main control board, the projector body 10 is also provided with an optical machine, a projection lens, a heat sink, an audio system, etc. The bracket assembly 20 includes a bracket arm 21 and a base 22, the bracket arm 21 is fixedly connected to the base 22, the projector body 10 is rotatably connected to the bracket arm 21, and the wiring socket 30 is arranged on the side of the bracket arm 21 away from the projector body 10.

[0043] The projection device 100 also includes a rotating shaft 40, which includes a first connecting piece 41 and a second connecting piece 42. The first connecting piece 41 is connected to the side of the second connecting piece 42 facing away from the projector body 10 for damping rotation, and the second connecting piece 42 is fixedly connected to the projector body 10, and the first connecting piece 41 is fixedly connected to the support arm 21, so that the projector body 10 is rotatably connected to the support arm 21 through the rotating shaft 40. Specifically, the projection device 100 further includes a first fastener 51 and a second fastener 52. The second connecting piece 42 is provided with a first assembly hole 421, and the shell of the projector body 10 is provided with a second assembly hole 11. The first fastener 51 passes through the first assembly hole 421 and extends into and is fixed in the second assembly hole 11, so as to fix the second connecting piece 42 to the projector body 10. The support arm 21 is provided with a third assembly hole 211, and the first connecting piece 41 is provided with a fourth assembly hole 411. The second fastener 52 passes through the third assembly hole 211 and extends into and is fixed in the fourth assembly hole 411, so as to fix the first connecting piece 41 to the support arm 21. The structure after the first fastener 51 and the second fastener 52 are assembled is as follows: Figure 3 In a specific example, the first fastener 51 and the second fastener 52 are screws, respectively, the first assembly hole 421 and the third assembly hole 211 are through holes, respectively, and the second assembly hole 11 and the fourth assembly hole 411 are threaded holes.

[0044] The projection device 100 further includes a shaft cover plate 60, which is connected to the side of the support arm 21 away from the projector body 10 and is located at the rotation axis. Specifically, the projection device 100 further includes a third fastener 53, a fifth assembly hole 61 is provided on the shaft cover plate 60, a sixth assembly hole 212 is provided on the support arm 21, the sixth assembly hole 212 is staggered with the third assembly hole 211, and the third fastener 53 passes through the fifth assembly hole 61 and extends into and is fixed to the sixth assembly hole 212, so as to fix the shaft cover plate 60 to the support arm 21. In a specific example, the third fastener 53 is a screw, the fifth assembly hole 61 is a through hole, and the sixth assembly hole 212 is a threaded hole.

[0045] A fixing hole 213 is provided on the bracket arm 21 at the position of the rotation axis. The wiring seat 30 includes a circuit board 31. The fixing hole 213 is used to place the circuit board 31. The shape of the fixing hole 213 is adapted to the shape of the circuit board 31 so that the circuit board 31 is fixedly arranged in the fixing hole 213. Furthermore, at least one stopper 2131 is convexly provided on the hole wall of the fixing hole 213, and at least one bayonet 311 is concavely provided at the edge of the circuit board 31. The stopper 2131 is snapped into the bayonet 311, so that the circuit board 31 can be prevented from rotating in the fixing hole 213. In other embodiments, the shapes of the fixing hole 213 and the circuit board 31 can also be set to non-circular structures. In this case, there is no need to set structures such as the stopper 2131 and the bayonet 311 to prevent rotation. However, in some embodiments, while the shapes of the fixing hole 213 and the circuit board 31 are set to be non-circular structures, structures such as a block 2131 and a bayonet 311 can also be set, which can not only prevent the circuit board 31 from rotating in the fixing hole 213 but also facilitate positioning.

[0046] After the circuit board 31 is placed in the fixing hole 213, the side facing the projector body 10 abuts against the side of the first connecting piece 41 away from the second connecting piece 42. After the shaft cover 60 is installed on the bracket arm 21, the side of the circuit board 31 away from the projector body 10 abuts against the side of the shaft cover 60 facing the projector body 10, wherein the shaft cover 60 and the shaft member 40 clamp the circuit board 32 in two directions to prevent the circuit board 32 from shaking, and further prevent the wiring seat 30 from shaking. Furthermore, a top boss 412 can be convexly provided on the side of the first connecting piece 41 away from the second connecting piece 42 to prevent the circuit board 31 from falling into the first wiring hole 43 opened on the shaft member 40; a boss or other structure can also be provided on the side of the shaft cover 60 facing the circuit board 31 to abut the circuit board 31.

[0047] The wiring socket 30 also includes a connector 32 and a lead (not shown in the figure). The connector 32 is arranged on the side of the circuit board 31 facing the projector body 10. The lead is electrically connected to the connector 32. A first wiring hole 43 is opened on the shaft member 40, and a second wiring hole 12 is opened on the shell of the projector body 10. The connector 32 extends into the first wiring hole 43, so that the size in the direction of the rotation axis can be minimized; the lead passes through the first wiring hole 43 and the second wiring hole 12 and then enters the shell of the projector body 10 to be electrically connected to the main control board inside the projector body 10.

[0048] The wiring socket 30 also includes a wiring port 33, which is arranged on the side of the circuit board 31 away from the projector body 10, and the opening direction of the wiring port 33 is facing away from the projector body 10. A first through hole 62 is formed on the end surface of the hinge cover 60 away from the projector body 10, and the wiring port 33 extends into the first through hole 62 to be exposed, so that it can be used to plug and unplug a data cable (USB, Type-C) or a power cable, etc.

[0049] After all accessories are installed, the first connecting piece 41 of the rotating shaft 40, the bracket arm 21, the rotating shaft cover 60, the circuit board 31, the wiring port 33, and the connector 32 are relatively stationary and do not rotate with the projector body 10; when the projector body 10 rotates, it only drives the second connecting piece 42 to rotate.

[0050] Furthermore, a groove may be provided on the side of the support arm 21 away from the projector body 10 and located at the position of the rotation axis, and the shaft cover 60 may be placed in the groove, so that the shaft cover 60 may be trapped in the support arm 21 .

[0051] The projection device disclosed in the preferred embodiment of the utility model can easily disassemble and assemble the wiring socket 30. As long as the shaft cover 60 is removed, the circuit board 31, the wiring port 33, and the connector 32 can be directly taken out, which is convenient for replacement and maintenance. In addition, the wiring socket 30 will not rotate with the projector body 10, so that the data line or power line inserted into the wiring socket 30 will not be twisted, and will not exert force on the projector body 10; at the same time, it can also prevent the data line or power line from loosening, falling off, or being damaged when the projector body 10 rotates at a large angle.

[0052] The connection socket 30 in the above embodiment can be a data line interface or a power line interface, which can correspondingly reduce the influence of the force exerted on the projector body 10 when the data line or the power line is bent or twisted.

[0053] In the above embodiment, the second connecting piece 42 is fixedly connected to the projector body 10 by the first fastener 51, the first connecting piece 41 is fixedly connected to the bracket arm 21 by the second fastener 52, and the rotating shaft cover 60 is fixedly connected to the bracket arm 21 by the third fastener 53. The first connecting piece 41, the bracket arm 21 and the rotating shaft cover 60 are always kept relatively still during use. In other embodiments, the third fastener 53 may not be provided, and the second fastener 52 may be used to directly fix the second connecting piece 42 and the rotating shaft cover plate 60 to the bracket arm 21, respectively. In this case, the bracket arm 21 may not have the sixth assembly hole 212, but the fifth assembly hole 61 may be directly opened at a corresponding position coaxial with the third assembly hole 211 and the fourth assembly hole 411, so that the second fastener 52 can pass through the fifth assembly hole 61 and the third assembly hole 211 and extend into and be fixed to the fourth assembly hole 411, so as to fix the first connecting piece 41 and the rotating shaft cover plate 60 to the bracket arm 21, respectively. In a specific example, the second fastener 53 is a screw, the fifth assembly hole 61 and the third assembly hole 211 are through holes, respectively, and the fourth assembly hole 411 is a threaded hole; in this example, some screws and threaded holes on the bracket arm may be omitted.

[0054] Embodiment 2

[0055] like Figures 4 to 6 As shown, the second embodiment of the present utility model discloses a projection device, wherein for the sake of simplifying the drawings, Figures 4 to 6 The following only further describes the differences between this embodiment and the first embodiment, and the common points between this embodiment and the first embodiment are not described in detail.

[0056] A mounting platform 63 is provided on one side of the shaft cover 60 protruding toward the projector body 10, and the circuit board 31 can be directly fixedly connected to the mounting platform 63, for example, by means of screws, bonding or clamping. At this time, there is no need to provide a fixing hole 213 that matches the shape of the circuit board 31 on the bracket arm 21, but only a third wiring hole 214 that matches the first wiring hole 43 is required. The lead wire (not shown in the figure), the connector (not shown in the figure), the circuit board 31 and the mounting platform 63 can extend into the third wiring hole 214 and the first wiring hole 43, thereby reducing the space occupied by the terminal socket 30 in the bracket arm 21 when it is installed, so that the bracket arm 21 can maintain a relatively thin shape.

[0057] In the first embodiment, the opening direction of the wiring port 33 is toward the outside of the axial direction of the shaft member 40, and the corresponding first through hole 62 is opened at the end face of the shaft cover 60, and the data line or the power line can be inserted from the first through hole 62 at the end face of the shaft cover 60; while the opening direction of the wiring port 33 in this embodiment is toward the bottom, and the corresponding first through hole 62 is opened at the side below the shaft cover 60, and the data line 70 or the power line can be inserted from the first through hole 62 at the bottom of the shaft cover 60; in other embodiments, the first through hole 62 can also be opened at any position on the side of the shaft cover 60, and the opening direction of the wiring port 33 is parallel to the side of the circuit board 31 away from the projector body 10 and corresponds to the first through hole 62.

[0058] The projection device proposed in each embodiment of the utility model, wherein a wiring socket electrically connected to the main control board in the projector body is arranged on a side of the bracket assembly away from the projector body, and is located on the rotation axis of the projector body relative to the bracket assembly; through the ingenious design of the position of the wiring socket, even if the wires inserted in the wiring socket are bent and twisted, it will basically not affect the projector body; and the wiring socket will not rotate with the projector body, which can prevent the wires from loosening, falling off or being damaged when the projector body rotates at a large angle.

[0059] The background section of the utility model may contain background information about the problem or environment of the utility model, rather than describing the prior art by others. Therefore, the content contained in the background technology section is not an admission of the applicant to the prior art.

[0060] The above content is a further detailed description of the utility model in combination with specific / preferred embodiments, and it cannot be determined that the specific implementation of the utility model is limited to these descriptions. For ordinary technicians in the technical field to which the utility model belongs, without departing from the concept of the utility model, it can also make several substitutions or modifications to these described embodiments, and these substitutions or modifications should be regarded as belonging to the protection scope of the utility model. In the description of this specification, the description of the reference terms "an embodiment", "some embodiments", "preferred embodiments", "examples", "specific examples", or "some examples" means that the specific features, structures, materials or characteristics described in combination with the embodiment or example are included in at least one embodiment or example of the utility model. In this specification, the schematic representation of the above terms does not necessarily target the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner. In addition, in the absence of mutual contradiction, the technical personnel in this field can combine and combine the different embodiments or examples described in this specification and the features of different embodiments or examples. Although the embodiments of the present invention and their advantages have been described in detail, it should be understood that various changes, substitutions and alterations can be made herein without departing from the scope defined by the appended claims.

Claims

1. A projection device, characterized in that: It includes a projector body and a bracket assembly, the projector body is rotatably connected to the bracket assembly, a main control board is provided in the projector body, and a wiring socket electrically connected to the main control board is provided on the side of the bracket assembly away from the projector body, and the wiring socket is located on the rotation axis of the projector body relative to the bracket assembly.

2. The projection device according to claim 1, characterized in that: It also includes a rotating shaft, which includes a first connecting piece and a second connecting piece, the first connecting piece is rotatably connected to the side of the second connecting piece facing away from the projector body, and the second connecting piece is fixedly connected to the projector body, and the first connecting piece is fixedly connected to the bracket assembly, so that the projector body is rotatably connected to the bracket assembly through the rotating shaft.

3. The projection device according to claim 2, characterized in that: Also includes a first fastener and a second fastener, wherein, A first assembly hole is formed on the second connecting piece, a second assembly hole is formed on the shell of the projector body, and the first fastener passes through the first assembly hole and extends into and is fixed in the second assembly hole, so as to fix the second connecting piece to the projector body; The bracket assembly is provided with a third assembly hole, the first connecting piece is provided with a fourth assembly hole, and the second fastener passes through the third assembly hole and extends into and is fixed to the fourth assembly hole, so as to fix the first connecting piece to the bracket assembly.

4. The projection device according to claim 3, characterized in that: It also includes a shaft cover plate, which is connected to the side of the bracket assembly away from the projector body and located at the position of the rotation axis, and a fifth assembly hole is provided on the shaft cover plate, wherein: The fifth assembly hole is coaxially arranged with the third assembly hole and the fourth assembly hole, and the second fastener passes through the fifth assembly hole and the third assembly hole and extends into and is fixed to the fourth assembly hole, so as to fix the first connecting piece and the rotating shaft cover plate to the bracket assembly respectively; or, It also includes a third fastener, the fifth assembly hole is staggered with the third assembly hole, a sixth assembly hole is opened on the bracket assembly and is coaxial with the fifth assembly hole, the third fastener passes through the fifth assembly hole and extends into and is fixed to the sixth assembly hole to fix the shaft cover to the bracket assembly.

5. The projection device according to claim 2, characterized in that: A fixing hole is provided on the bracket assembly at the position of the rotation axis, and the wiring seat includes a circuit board. The shape of the fixing hole is adapted to the shape of the circuit board so that the circuit board is fixed in the fixing hole, and the side of the circuit board facing the projector body abuts against the first connecting piece.

6. The projection device according to claim 5, characterized in that: At least one stopper is convexly provided on the hole wall of the fixing hole, and at least one slot is concavely provided at the edge of the circuit board, and the stopper is snapped into the slot; and / or the shapes of the fixing hole and the circuit board are both non-circular structures.

7. The projection device according to claim 5, characterized in that: The wiring socket also includes a connector and a lead. The connector is arranged on the side of the circuit board facing the projector body. The lead is electrically connected to the connector. A first wiring hole is opened on the rotating shaft, and a second wiring hole is opened on the shell of the projector body. The connector extends into the first wiring hole. The lead passes through the first wiring hole and the second wiring hole and then enters the interior of the shell of the projector body.

8. The projection device according to claim 1, characterized in that: It also includes a shaft cover plate, which covers the side of the bracket assembly away from the projector body and is located at the position of the rotation axis, wherein the wiring seat includes a circuit board and a wiring port, the side of the circuit board away from the projector body abuts against the side of the shaft cover plate facing the projector body, the wiring port is arranged on the side of the circuit board away from the projector body, and a first through hole is opened on the shaft cover plate, and the wiring port extends into the first through hole to be exposed.

9. The projection device according to claim 8, characterized in that: The opening direction of the wiring port faces the direction away from the projector body, and the first through hole is formed at the end surface of the shaft cover away from the projector body; or, The opening direction of the wiring port is parallel to the side of the circuit board away from the projector body, and the first through hole is opened at the side of the rotating shaft cover.

10. The projection device according to claim 8, characterized in that: A mounting platform is protruded from one side of the shaft cover toward the projector body, the circuit board is fixedly connected to the mounting platform, a third wiring hole is provided on the bracket assembly, and the circuit board and the mounting platform extend into the third wiring hole.

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