Lifting drive device and fan

Abstract

The present invention relates to the technical field of household appliances, and more specifically to a lifting drive device and a fan, the lifting drive device comprising: a lower tube, suitable for being fixedly mounted on a chassis of the fan; a stroke tube, which can be raised and lowered on the lower tube, the upper end of which is suitable for mounting a fan head; a drive motor, which is fixedly mounted on the stroke tube; a driving wheel, which is fixedly connected to the motor shaft of the drive motor; a driven wheel, which is mounted on the stroke tube; a transmission member, which is wound around the driving wheel and the driven wheel, and when the driving wheel rotates under the drive of the drive motor, the driven wheel is driven to rotate through the transmission member, and the transmission member is connected to the lower tube via a connecting member. The lifting drive device drives the stroke tube to move up and down through the transmission member, has low cost, and has low requirements for the processing technology of parts.

Description

Technical Field

[0001] The present invention relates to the technical field of household appliances, and in particular to a lifting drive device and a fan. Background Art

[0002] At present, various fan products are emerging in the market. Among them, circulation fans are popular among the public for their air circulation and multi-angle air supply. In order to pursue air supply at more angles, the fan lifting function is indispensable.

[0003] The prior art discloses a fan lifting device comprising a set of engaging members, each comprising a rod-shaped member and a mating member. The rod-shaped member engages with the mating member, the rod-shaped member being fixed inside the fan, and the engaging member being fixed to the fan's telescopic inner tube. Alternatively, the rod-shaped member may be a worm and the mating member a worm gear; alternatively, the rod-shaped member may be a lead screw and the mating member a nut. The operation of a motor drives the rod-shaped member to rotate, which in turn drives the mating member to move up and down along the rod-shaped member, controlling the rise and fall of the fan's telescopic inner tube and thereby controlling the up and down movement of the fan head.

[0004] In the above-mentioned prior art, the fan is driven to rise and fall by the cooperation of a worm and a turbine or a lead screw and a nut, which is costly and has high requirements on the processing technology of parts. Summary of the Invention

[0005] Therefore, the technical problem to be solved by the present invention is to overcome the defects of the prior art in that the structural cost of driving the fan to lift is high and the processing technology requirements for parts are high, thereby providing a lifting drive device and fan with low cost and low processing technology requirements for parts.

[0006] In order to solve the above technical problems, the present invention provides a lifting drive device, including: a lower tube, suitable for being fixedly installed on the chassis of the fan; a stroke tube, which can be lifted and lowered on the lower tube, and the upper end of the stroke tube is suitable for installing the head of the fan; a driving motor, which is fixedly arranged on the stroke tube; a driving wheel, which is fixedly connected to the motor shaft of the driving motor; a driven wheel, which is arranged on the stroke tube; a transmission member, which is wound around the driving wheel and the driven wheel, and when the driving wheel rotates under the drive of the driving motor, the driven wheel is driven to rotate through the transmission member, and the transmission member is connected to the lower tube through a connecting member.

[0007] Optionally, the inner side of the transmission member has a first meshing tooth, the connecting member is provided with a second meshing tooth, the first meshing tooth is meshed and connected with the second meshing tooth, and the connecting member is fixedly connected to the lower tube.

[0008] Optionally, the connecting member includes two first screw columns arranged at intervals, the two first screw columns are located on both sides of the transmission member, the top of the lower tube is provided with a first screw hole corresponding to the first screw column, and the connecting member is connected to the lower tube by screws.

[0009] Optionally, a step surface is provided in the stroke tube, a motor fixing plate is fixedly provided on the step surface, and the drive motor is provided on the motor fixing plate.

[0010] Optionally, the motor fixing plate is fixedly connected to a mounting plate, the upper end of the mounting plate is provided with a first axial hole suitable for the motor shaft to pass through, the lower end of the mounting plate is provided with a second axial hole suitable for the installation of the rotating shaft of the driven wheel, the motor shaft passes through the first axial hole to be connected to the driving wheel, and the rotating shaft of the driven wheel is set in the second axial hole.

[0011] Optionally, a slide groove is provided in the lower tube, and the mounting plate is slidably disposed in the slide groove.

[0012] Optionally, the lifting drive device also includes a coil spring, the lower end of the mounting plate is fixedly connected to a coil spring fixing plate, the main body of the coil spring is arranged in the coil spring fixing plate, the free end of the coil spring is fixedly connected to the lower tube, and the position of the free end of the coil spring is higher than the position of the main body.

[0013] Optionally, a slot is provided on the lower tube, and the free end of the coil spring is clamped in the slot.

[0014] Optionally, the coil spring fixing plate is fixedly connected to the stroke tube.

[0015] Optionally, the lifting drive device further includes a limiting structure for limiting the lifting stroke of the stroke tube.

[0016] Optionally, an annular limiting boss is provided in the stroke tube, and a plurality of sliding ribs spaced circumferentially are provided on the outer side of the lower tube. The limiting boss is located on the lower side of the sliding rib. When the limiting boss abuts against the lower end of the sliding rib, the stroke tube rises to the highest height.

[0017] Optionally, the sliding rib is provided at the top end of the lower tube, and the lower end of the travel tube can abut against the chassis.

[0018] Optionally, the transmission member is a conveyor belt.

[0019] The present invention also provides a fan, comprising the lifting drive device.

[0020] The technical solution of the present invention has the following advantages:

[0021] The lifting drive device provided by the present invention has the following characteristics: when the driving motor rotates forward, it drives the transmission member to rotate in a first preset direction. Since the transmission member is connected to the lower tube and the position of the lower tube is fixed, the local position of the transmission member connected to the lower tube remains unchanged, thereby driving the driving motor, the driving wheel, and the driven wheel to rise as a whole. Since the driving motor, the driving wheel, and the driven wheel are all arranged on the stroke tube, the stroke tube is driven to rise; when the driving motor rotates reversely, it drives the transmission member to rotate in a second preset direction. Since the transmission member is connected to the lower tube and the position of the lower tube is fixed, the local position of the transmission member connected to the lower tube remains unchanged, thereby driving the driving motor, the driving wheel, and the driven wheel to descend as a whole. Since the driving motor, the driving wheel, and the driven wheel are all arranged on the stroke tube, the stroke tube is driven to descend. Since the connecting member connects the transmission member to the lower tube, the stroke tube can be moved to any position. The position of the stroke tube is fixed by the connecting member, and the height of the machine head can be infinitely adjusted. The lifting drive device drives the stroke tube to move up and down through the transmission member, which is low in cost and has low requirements for the processing technology of the components. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the specific embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0023] Figure 1 An exploded view of the fan provided in Example 2 of the present invention;

[0024] Figure 2 is a cross-sectional view of a fan provided in embodiment 2 of the present invention;

[0025] Figure 3 for Figure 2 A partial enlarged view of

[0026] Figure 4 for Figure 1 Schematic diagram of the structure of the motor fixing plate;

[0027] Figure 5 for Figure 1 Schematic diagram of the structure of the mounting plate;

[0028] Figure 6 for Figure 1 Schematic diagram of the structure of the connecting parts;

[0029] Figure 7 for Figure 1 A schematic diagram of the structure of the lower tube at an angle;

[0030] Figure 8 for Figure 1 A schematic diagram of the structure of the lower tube at another angle;

[0031] Figure 9 for Figure 1 Schematic diagram of the structure of the coil spring fixing plate;

[0032] Figure 10 for Figure 1 Schematic diagram of the structure of the stroke tube;

[0033] Figure 11 for Figure 10 sectional view of

[0034] Figure 12 for Figure 10 Top view of .

[0035] Description of reference numerals:

[0036] 1. Lower tube; 101. First screw hole; 102. Slide groove; 103. Clamping groove; 104. Sliding rib; 2. Chassis; 3. Stroke tube; 301. First tube section; 302. Second tube section; 303. Step surface; 304. Position limiting boss; 305. Second screw hole; 4. Machine head; 5. Driving motor; 6. Driving wheel; 7. Driven wheel; 8. Transmission member; 9. Connecting member; 901. Second meshing tooth; 902. First Screw column; 903, plate body; 10, motor fixing plate; 1001, first screw through hole; 1002, motor fixing screw hole; 1003, second screw hole; 11, mounting plate; 1101, first axial hole; 1102, second axial hole; 1103, bottom plate; 1104, side plate; 1105, mounting through hole; 12, coil spring; 13, coil spring fixing plate; 1301, coil spring groove; 1302, third screw hole. DETAILED DESCRIPTION

[0037] The technical solution of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the embodiments described are only some embodiments of the present invention, not all embodiments. All other embodiments obtained by ordinary technicians in this field based on the embodiments of the present invention without making any creative efforts shall fall within the scope of protection of the present invention.

[0038] In the description of the present invention, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings and are intended solely to facilitate and simplify the description of the present invention. They are not intended to indicate or imply that the devices or components referred to must have, be constructed, or operate in a specific orientation, and therefore should not be construed as limitations on the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0039] In the description of the present invention, it should be noted that, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "connected" should be understood in a broad sense. For example, they may refer to fixed, detachable, or integral connections; mechanical or electrical connections; direct or indirect connections through an intermediate medium; and internal communication between two components. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on specific circumstances.

[0040] In addition, the technical features involved in the different embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0041] Example 1

[0042] This embodiment provides a lifting drive device.

[0043] In one embodiment, Figures 1 to 12 As shown, the lifting drive device includes a lower tube 1, a stroke tube 3, a drive motor 5, a driving wheel 6, a driven wheel 7, and a transmission member 8. The lower tube 1 is adapted to be fixedly mounted on the fan chassis 2; the stroke tube 3 is movably mounted on the lower tube 1, with the fan head 4 mounted on its upper end; the drive motor 5 is fixedly mounted on the stroke tube 3; the driving wheel 6 is fixedly connected to the motor shaft of the drive motor 5; the driven wheel 7 is mounted on the stroke tube 3; and the transmission member 8 is wound around the driving wheel 6 and the driven wheel 7. When the driving wheel 6 rotates under the drive motor 5, it drives the driven wheel 7 to rotate via the transmission member 8. The transmission member 8 is connected to the lower tube 1 via a connector 9.

[0044] In this embodiment, when the driving motor 5 rotates forward, it drives the transmission member 8 to rotate along the first preset direction. Since the transmission member 8 is connected to the lower tube 1 and the position of the lower tube 1 is fixed, the local position of the transmission member 8 connected to the lower tube 1 remains unchanged, thereby driving the driving motor 5, the driving wheel 6, and the driven wheel 7 to rise as a whole. Since the driving motor 5, the driving wheel 6, and the driven wheel 7 are all arranged on the stroke tube 3, the stroke tube 3 is driven to rise; when the driving motor 5 is reversed, it drives the transmission member 8 to rotate along the second preset direction. Since the transmission member 8 is connected to the lower tube 1 and the position of the lower tube 1 is fixed, the local position of the transmission member 8 connected to the lower tube 1 remains unchanged, thereby driving the driving motor 5, the driving wheel 6, and the driven wheel 7 to descend as a whole. Since the driving motor 5, the driving wheel 6, and the driven wheel 7 are all arranged on the stroke tube 3, the stroke tube 3 is driven to descend, and since the connecting member 9 connects the transmission member 8 to the lower tube 1, the stroke tube 3 can be moved to any position. The position of the stroke tube 3 is fixed by the connecting member 9, and the height of the machine head 4 can be infinitely adjusted. The first preset direction is one of the counterclockwise and clockwise directions, and the second preset direction is the other of the counterclockwise and clockwise directions. This embodiment uses the transmission member 8 to drive the stroke tube 3 to move up and down, which is low in cost and has low requirements for the processing technology of parts.

[0045] On the basis of the above embodiment, in a preferred embodiment, the inner side of the transmission member 8 has a first meshing tooth, such as Figure 6 As shown, the connecting member 9 is provided with second meshing teeth 901, the first meshing teeth meshing with the second meshing teeth 901, and the connecting member 9 is fixedly connected to the lower tube 1. In this embodiment, the connecting member 9 and the transmission member 8 are meshed and connected, which is simple and convenient, and can improve assembly efficiency. In an alternative embodiment, the connecting member 9 and the transmission member 8 are connected by screws or snaps.

[0046] It should be noted that when the inner side of the transmission member 8 has the first meshing teeth, the driving wheel 6 and the driven wheel 7 also have third meshing teeth that match the first meshing teeth.

[0047] Based on the above embodiment, in a preferred embodiment, the connecting member 9 includes two first screw studs 902 spaced apart from each other. The two first screw studs 902 are located on either side of the transmission member 8. The top of the lower tube 1 is provided with first screw holes 101 corresponding to the first screw studs 902. The connecting member 9 is screwed to the lower tube 1. In this embodiment, after assembly, the two first screw studs 902 are located on either side of the transmission member 8, and the transmission member 8 is clamped between the two first screw studs 902. The first screw studs 902 can guide the operation of the transmission member 8 and prevent it from deflecting.

[0048] In one embodiment, combined Figure 2 and Figure 6 The connecting member 9 includes a plate body 903, a second meshing tooth 901 located on one side of the plate body 903, and a first screw column 902 located on the other side of the plate body 903. The transmission member 8 includes a first portion and a second portion located on the left and right sides of the driving wheel 6 and the driven wheel 7, respectively. The connecting member 9 is meshedly connected to the second portion, and two first screw columns 902 are located on either side of the first portion. In this embodiment, when the transmission member 8 rotates counterclockwise, the travel tube 3 descends, and when the transmission member 8 rotates clockwise, the travel tube 3 ascends. Of course, in other alternative embodiments, the second meshing tooth 901 and the first screw column 902 can be located on the same side of the plate body 903.

[0049] Based on the above embodiment, in a preferred embodiment, a stepped surface 303 is provided within the stroke tube 3. A motor mounting plate 10 is fixedly mounted on the stepped surface 303, and the drive motor 5 is mounted on the motor mounting plate 10. In this embodiment, the provision of the stepped surface 303 facilitates the installation and fixation of the drive motor 5. In other alternative embodiments, the drive motor 5 is directly fixed to the inner wall of the stroke tube 3 using screws.

[0050] In one embodiment, the travel tube 3 includes a first tube section 301 and a second tube section 302. The first tube section 301 is located above the second tube section 302. The diameter of the first tube section 301 is larger than the diameter of the second tube section 302. A step surface 303 is formed between the first tube section 301 and the second tube section 302. The head 4 is suitable for being installed above the first tube section 301. The length of the first tube section 301 is shorter than the length of the second tube section 302, which facilitates fixing the motor fixing plate 10 in the travel tube 3. Figure 4 As shown, the motor fixing plate 10 is provided with a plurality of first screw holes 1001 distributed along the circumference, and the motor fixing plate 10 is connected to the step surface 303 by screws. The motor fixing plate 10 is provided with a plurality of motor fixing screw holes 1002, and the drive motor 5 is fixed in the motor fixing screw holes 1002 by screws.

[0051] Based on the above embodiment, in a preferred embodiment, the motor fixing plate 10 is fixedly connected to the mounting plate 11. The upper end of the mounting plate 11 is provided with a first axial hole 1101 suitable for the motor shaft to pass through, and the lower end of the mounting plate 11 is provided with a second axial hole 1102 suitable for the installation of the rotating shaft of the driven wheel 7. The motor shaft passes through the first axial hole 1101 and is connected to the driving wheel 6, and the rotating shaft of the driven wheel 7 is set in the second axial hole 1102. In this embodiment, by providing the mounting plate 11, the mounting plate 11, the motor fixing plate 10, the driving wheel 6, the driven wheel 7, and the transmission member 8 can be connected as a whole. After the motor fixing plate 10, the mounting plate 11, the driving wheel 6, the driven wheel 7, and the transmission member 8 are connected as a whole, they are installed in the stroke tube 3, which facilitates assembly.

[0052] like Figure 4As shown, the motor fixing plate 10 is provided with two second screw holes 1003, and the upper end of the mounting plate 11 is provided with two mounting through holes 1105. Screws pass through the mounting through holes 1105 and connect with the second screw holes 1003 to fix the mounting plate 11 to the motor fixing plate 10. Figure 4 The mounting plate 11 includes a base plate 1103 and side plates 1104 located on both sides of the base plate 1103. The upper ends of the two side plates 1104 are respectively provided with first axial holes 1101, and the lower ends of the two side plates 1104 are respectively provided with second axial holes 1102. The driving wheel 6 and the driven wheel 7 are respectively located between the two side plates 1104. The motor shaft of the drive motor 5 passes through the first axial hole 1101 and is fixedly connected to the center hole of the driving wheel 6. The rotating shaft of the driven wheel 7 is rotatably provided in the second axial hole 1102.

[0053] On the basis of the above embodiment, in a preferred embodiment, as Figure 7 As shown, a chute 102 is provided within the lower tube 1, and the mounting plate 11 is slidably disposed within the chute 102. In this embodiment, since the mounting plate 11 is slidably disposed within the chute 102, and the driving wheel 6, driven wheel 7, transmission member 8, and motor mounting plate 10 are all connected to the mounting plate 11, the chute 102 can guide the lifting and lowering movement of the integrally connected mounting plate 11, motor mounting plate 10, driving wheel 6, driven wheel 7, and transmission member 8. The chute 102 has an opening provided on the peripheral wall of the lower tube 1, and the opening extends along the length of the lower tube 1. During installation, the mounting plate 11 is installed into the chute 102 through the opening.

[0054] On the basis of the above embodiment, in a preferred embodiment, as Figure 2 and Figure 3 As shown, the lifting drive device also includes a coil spring 12. A coil spring fixing plate 13 is fixedly connected to the lower end of the mounting plate 11. The main body of the coil spring 12 is disposed within the coil spring fixing plate 13. The free end of the coil spring 12 is fixedly connected to the lower tube 1, and the free end of the coil spring 12 is located higher than the main body. In this embodiment, when the travel tube 3 rises, the main body of the coil spring 12 rises with the mounting plate 11. The free end of the coil spring 12 exerts an upward thrust on the mounting plate 11, balancing the gravity of the fan head 4 and reducing the power consumption of the motor 5 during the upward movement of the coil spring 12.

[0055] Specifically, such as Figure 9 As shown, a coil spring groove 1301 is provided in the coil spring fixing plate 13 , and the main body of the coil spring 12 is disposed in the coil spring groove 1301 .

[0056] On the basis of the above embodiment, in a preferred embodiment, as Figure 7As shown, a clamping groove 103 is provided on the lower tube 1, and the free end of the coil spring 12 is clamped in the clamping groove 103. In this embodiment, the assembly method of the free end of the coil spring 12 and the lower tube 1 is simple and convenient.

[0057] Based on the above embodiment, in a preferred embodiment, the coil spring fixing plate 13 is fixedly connected to the stroke tube 3. In this embodiment, by fixing the coil spring fixing plate 13 to the stroke tube 3, the synchronous belt assembly formed by the mounting plate 11, the motor fixing plate 10, the driving pulley 6, the driven pulley 7, the transmission member 8, and the coil spring fixing plate 13 is fixedly connected to the stroke tube 3, further ensuring that the synchronous belt assembly can drive the stroke tube 3 to move up and down.

[0058] In one embodiment, Figure 9 As shown, the coil spring fixing plate 13 is provided with a third screw hole 1302, as shown in FIG. Figure 10 As shown, a second screw through hole 305 is provided on the tube wall of the travel tube 3, and the coil spring fixing plate 13 and the travel tube 3 are fixedly connected by screws.

[0059] Based on the above embodiment, in a preferred embodiment, the lifting drive device further includes a limiting structure for limiting the lifting stroke of the stroke tube 3. In this embodiment, the setting of the limiting structure can limit the lifting stroke of the stroke tube 3 and prevent the stroke tube 3 from separating from the lower tube 1.

[0060] On the basis of the above embodiment, in a preferred embodiment, as Figure 11 and Figure 12 As shown, an annular limiting boss 304 is provided in the stroke tube 3. Figure 7 and Figure 8 As shown, the outer side of the lower tube 1 is provided with a plurality of circumferentially spaced sliding ribs 104. A limiting boss 304 is located below the sliding ribs 104. When the limiting boss 304 abuts the lower end of the sliding rib 104, the travel tube 3 rises to its maximum height. In this embodiment, when the limiting boss 304 abuts the lower end of the sliding rib 104, the limiting boss 304 is blocked by the sliding rib 104 and cannot continue to rise. As a result, the travel tube 3 cannot continue to rise, preventing it from separating from the lower tube 1. In an alternative embodiment, the sliding rib 104 on the outer side of the lower tube 1 can be replaced with an annular boss.

[0061] In one embodiment, the sliding bar 104 is provided at the top end of the lower tube 1, and the lower end of the stroke tube 3 can be abutted against the chassis 2. When the lower end of the stroke tube 3 abuts against the chassis 2, the stroke tube 3 drops to the lowest height, and the chassis 2 limits the lowest height of the stroke tube 3. The arrangement of the sliding bar 104 and the chassis 2 enables the stroke tube 3 to have a larger lifting stroke.

[0062] Based on the above embodiment, in a preferred embodiment, the transmission member 8 is a conveyor belt. In this embodiment, the cost of the conveyor belt is low and the processing requirements of each component are low. In an alternative embodiment, the transmission member 8 is a chain or a rope.

[0063] The assembly process of the lifting drive device provided in this embodiment is as follows:

[0064] First, assemble the synchronous belt assembly, connect the mounting plate 11 to the motor fixing plate 10 by screws, match the driving pulley 6, the driven pulley 7 and the conveyor belt with belt transmission and install them on the mounting plate 11, fix the drive motor 5 on the motor fixing plate 10, and make the motor shaft of the drive motor 5 pass through the first axial hole 1101 on the mounting plate 11 and fixedly connected to the driving pulley 6, and assemble the coil spring fixing plate 13 to the bottom of the driven pulley 7 by screws; then assemble the mounting plate 11 into the slide groove 102 of the lower tube 1, engage the connecting piece 9 with the lower tube 1, and fix the connecting piece 9 to the lower tube 1 by screws; install the main body of the coil spring 12 into the coil spring groove 1301, and embed the free end of the coil spring 12 into the slot 103 of the lower tube 1; then, put the stroke tube 3 on the outside of the lower tube 1 from bottom to top, and connect the motor fixing plate 10 to the step surface 303 inside the stroke tube 3 by screws. At this point, the lower tube 1 and the stroke tube 3 are cylindrically concentric.

[0065] Example 2

[0066] This embodiment provides a fan, such as Figure 1 and Figure 2 As shown, it comprises a chassis 2, a machine head 4 and the lifting drive device provided in the above embodiment. Among them, the lower tube 1 is fixedly installed on the chassis 2, and the machine head 4 is installed on the travel tube 3.

[0067] Obviously, the above embodiments are merely examples for clarity of explanation and are not intended to limit the implementation methods. Those skilled in the art will readily appreciate that other variations or modifications based on the above descriptions are possible. It is not necessary and impossible to enumerate all implementation methods here. Obvious variations or modifications arising therefrom remain within the scope of protection of the present invention.

Claims

1. A lifting drive device, characterized in that: include: A lower tube (1) adapted to be fixedly mounted on a chassis (2) of the fan; A stroke tube (3) is arranged on the lower tube (1) in a manner capable of being raised and lowered, and the upper end of the stroke tube (3) is suitable for mounting a fan head (4); A driving motor (5) is fixedly mounted on the travel tube (3); A driving wheel (6) is fixedly connected to the motor shaft of the driving motor (5); A driven wheel (7) is arranged on the travel tube (3); a transmission member (8) arranged around the driving wheel (6) and the driven wheel (7); when the driving wheel (6) is driven by the driving motor (5) to rotate, the driven wheel (7) is driven to rotate via the transmission member (8); and the transmission member (8) is connected to the lower tube (1) via a connecting member (9); A mounting plate (11) is provided at the upper end of the mounting plate (11) with a first axial hole (1101) suitable for the motor shaft to pass through, and a second axial hole (1102) suitable for the installation of the rotating shaft of the driven wheel (7) is provided at the lower end of the mounting plate (11), the motor shaft passes through the first axial hole (1101) to be connected to the driving wheel (6), and the rotating shaft of the driven wheel (7) is arranged in the second axial hole (1102); the lifting drive device also includes a coil spring (12), the lower end of the mounting plate (11) is fixedly connected to a coil spring fixing plate (13), the main body of the coil spring (12) is arranged in the coil spring fixing plate (13), the free end of the coil spring (12) is fixedly connected to the lower tube (1), and the position of the free end of the coil spring (12) is higher than the position of the main body.

2. The lifting drive device according to claim 1, characterized in that: The transmission member (8) has a first meshing tooth on its inner side, the connecting member (9) is provided with a second meshing tooth (901), the first meshing tooth and the second meshing tooth (901) are meshed and connected, and the connecting member (9) is fixedly connected to the lower tube (1).

3. The lifting drive device according to claim 2, characterized in that: The connecting member (9) comprises two first screw columns (902) arranged at intervals, the two first screw columns (902) being located on both sides of the transmission member (8), the top of the lower tube (1) being provided with a first screw hole (101) corresponding to the first screw columns (902), and the connecting member (9) being connected to the lower tube (1) by screws.

4. The lifting drive device according to claim 1, characterized in that: A stepped surface (303) is provided in the stroke tube (3), a motor fixing plate (10) is fixedly provided on the stepped surface (303), and the drive motor (5) is provided on the motor fixing plate (10).

5. The lifting drive device according to claim 4, characterized in that: The motor fixing plate (10) is fixedly connected to the mounting plate (11).

6. The lifting drive device according to claim 5, characterized in that: A sliding groove (102) is provided in the lower tube (1), and the mounting plate (11) is slidably disposed in the sliding groove (102).

7. The lifting drive device according to claim 1, characterized in that: The lower tube (1) is provided with a clamping slot (103), and the free end of the coil spring (12) is clamped in the clamping slot (103).

8. The lifting drive device according to claim 1, characterized in that: The coil spring fixing plate (13) is fixedly connected to the travel tube (3).

9. The lifting drive device according to any one of claims 1 to 6, characterized in that: The lifting drive device further comprises a limiting structure for limiting the lifting stroke of the stroke tube (3).

10. The lifting drive device according to claim 9, characterized in that: An annular limiting boss (304) is provided inside the stroke tube (3), and a plurality of sliding ribs (104) spaced apart along the circumferential direction are provided on the outer side of the lower tube (1). The limiting boss (304) is located on the lower side of the sliding rib (104). When the limiting boss (304) abuts against the lower end of the sliding rib (104), the stroke tube (3) rises to the highest height.

11. The lifting drive device according to claim 10, characterized in that: The sliding rib (104) is arranged at the top end of the lower tube (1), and the lower end of the travel tube (3) can abut against the chassis (2).

12. The lifting drive device according to any one of claims 1 to 6, characterized in that: The transmission member (8) is a conveyor belt.

13. A fan, characterized in that: The invention comprises the lifting drive device according to any one of claims 1 to 12.

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