CN216044543U - Lifting driving device and fan - Google Patents

Abstract

The utility model relates to the technical field of household appliances, in particular to a lifting driving device and a fan, wherein the lifting driving device comprises: the lower pipe is suitable for being fixedly arranged on a chassis of the fan; the stroke pipe is arranged on the lower pipe in a lifting way, and the upper end of the stroke pipe is suitable for installing a machine head of the fan; the driving motor is fixedly arranged on the stroke pipe; the driving wheel is fixedly connected with a motor shaft of the driving motor; a driven wheel arranged on the stroke pipe; the driving wheel is arranged outside the driven wheel in a winding mode, the driving wheel drives the driven wheel to rotate through the transmission piece when the driving wheel is driven by the driving motor to rotate, and the transmission piece is connected with the lower pipe through the connecting piece. The lifting driving device drives the stroke pipe to move up and down through the transmission part, so that the cost is low, and the requirements on the processing technology of parts are low.

Description

Lifting driving device and fan

Technical Field

The utility model relates to the technical field of household appliances, in particular to a lifting driving device and a fan.

Background

In the market, various fan products are diversified, wherein the circulating fan is popular with people through circulating air and multi-angle air supply, and the fan lifting function is essential for pursuing more-angle air supply.

The prior art discloses a lifting device of a fan, which comprises a group of engaging members, wherein each engaging member comprises a rod-shaped member and a matching member, the rod-shaped member is engaged with the matching member, the rod-shaped member is fixed in the fan, and the engaging members are fixed on a telescopic inner pipe of the fan. Wherein, the rod-shaped piece is a worm, and the matching piece is a worm wheel; or the rod-shaped piece is a screw rod, and the matching piece is a nut. The motor can drive the rod-shaped part to rotate under the operation of the motor, and then the matching piece is driven to move up and down along the whole body of the rod-shaped part, so that the telescopic inner pipe of the fan is controlled to ascend or descend, and the up-and-down movement of the head of the fan is controlled.

In the prior art, the fan is driven to lift through the matching of the worm and the turbine or the matching of the lead screw and the nut, so that the cost is high, and the requirements on the processing technology of parts are high.

SUMMERY OF THE UTILITY MODEL

Therefore, the technical problem to be solved by the present invention is to overcome the defects of the prior art that the structure for driving the fan to lift has high cost and high requirements for the processing technology of the components, so as to provide a lifting driving device and a fan with low cost and low requirements for the processing technology of the components.

In order to solve the above technical problem, the present invention provides a lift driving device, including: the lower pipe is suitable for being fixedly arranged on a chassis of the fan; the stroke pipe is arranged on the lower pipe in a lifting way, and the upper end of the stroke pipe is suitable for installing a machine head of the fan; the driving motor is fixedly arranged on the stroke pipe; the driving wheel is fixedly connected with a motor shaft of the driving motor; a driven wheel arranged on the stroke pipe; the driving wheel is arranged outside the driven wheel in a winding mode, the driving wheel drives the driven wheel to rotate through the transmission piece when the driving wheel is driven by the driving motor to rotate, and the transmission piece is connected with the lower pipe through the connecting piece.

Optionally, the inner side of the transmission member is provided with a first meshing tooth, the connecting member is provided with a second meshing tooth, the first meshing tooth is meshed with the second meshing tooth, and the connecting member is fixedly connected with the lower pipe.

Optionally, the connecting piece includes two first screw posts that the interval set up, two first screw post is located the both sides of driving medium, the top of low tube be equipped with the corresponding first screw hole of first screw post, the connecting piece with the low tube passes through screwed connection.

Optionally, a step surface is arranged in the stroke pipe, a motor fixing plate is fixedly arranged on the step surface, and the driving motor is arranged on the motor fixing plate.

Optionally, motor fixed plate fixedly connected with mounting panel, the upper end of mounting panel is equipped with and is fit for the first shaft hole that the motor shaft passed, the lower extreme of mounting panel is equipped with and is suitable for the second shaft hole of the pivot installation from the driving wheel, the motor shaft passes first shaft hole with the action wheel is connected, the pivot setting from the driving wheel is in the second shaft hole.

Optionally, a chute is arranged in the lower tube, and the mounting plate is slidably arranged in the chute.

Optionally, the lifting driving device further includes a coil spring, a coil spring fixing plate is fixedly connected to the lower end of the mounting plate, a body portion of the coil spring is disposed in the coil spring fixing plate, a 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 body portion.

Optionally, a clamping groove is formed in the lower pipe, and a free end of the coil spring is clamped in the clamping groove.

Optionally, the coil spring fixing plate is fixedly connected with the stroke tube.

Optionally, the lifting driving device further comprises a limiting structure for limiting the lifting stroke of the stroke pipe.

Optionally, an annular limiting boss is arranged in the stroke pipe, a plurality of sliding ribs distributed at intervals along the circumferential direction are arranged on the outer side of the lower pipe, the limiting boss is located on the lower side of the sliding ribs, and when the limiting boss abuts against the lower ends of the sliding ribs, the stroke pipe rises to the highest height.

Optionally, the sliding rib is arranged at the top end of the lower pipe, and the lower end of the stroke pipe can abut against the chassis.

Optionally, the drive member is a conveyor belt.

The utility model also provides a fan which comprises the lifting driving device.

The technical scheme of the utility model has the following advantages:

according to the lifting driving device provided by the utility model, when the driving motor rotates forwards, the driving part is driven to rotate along the first preset direction, and the driving part is connected with the lower pipe, and the position of the lower pipe is fixed, so that the local position of the driving part connected with the lower pipe is unchanged, and the driving motor, the driving wheel and the driven wheel are driven to integrally lift; when driving motor reverses, drive the driving medium and predetermine the direction rotation along the second, because the driving medium links to each other with the low tube, and the rigidity of low tube is motionless, consequently, the local position of the driving medium that links to each other with the low tube is unchangeable, thereby drive driving motor, the action wheel, from the whole decline of driving wheel, because driving motor, the action wheel, all set up on the stroke pipe from the driving wheel, consequently, it descends to drive the stroke pipe, and because the connecting piece links to each other driving medium and low tube, the stroke pipe removes arbitrary position, all through the position of this connecting piece fixed stroke pipe, can realize the height of infinitely variable control aircraft nose. The lifting driving device drives the stroke pipe to move up and down through the transmission part, so that the cost is low, and the requirements on the processing technology of parts are low.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and other drawings can be obtained by those skilled in the art without creative efforts.

Fig. 1 is an exploded view of a fan provided in embodiment 2 of the present invention;

fig. 2 is a sectional view of a fan provided in embodiment 2 of the present invention;

FIG. 3 is an enlarged view of a portion of FIG. 2;

FIG. 4 is a schematic structural diagram of a motor fixing plate in FIG. 1;

FIG. 5 is a schematic view of the mounting plate of FIG. 1;

FIG. 6 is a schematic view of the connector of FIG. 1;

FIG. 7 is a schematic view of the down tube of FIG. 1 at an angle;

FIG. 8 is a schematic view of the down tube of FIG. 1 at another angle;

FIG. 9 is a schematic structural view of a coil spring retaining plate of FIG. 1;

FIG. 10 is a schematic view of the construction of the travel tube of FIG. 1;

FIG. 11 is a cross-sectional view of FIG. 10;

fig. 12 is a top view of fig. 10.

Description of reference numerals:

1. a lower pipe; 101. a first screw hole; 102. a chute; 103. a card slot; 104. sliding ribs; 2. a chassis; 3. a travel tube; 301. a first tube section; 302. a second tube section; 303. a step surface; 304. a limiting boss; 305. a second screw via hole; 4. a machine head; 5. a drive motor; 6. a driving wheel; 7. a driven wheel; 8. a transmission member; 9. a connecting member; 901. a second meshing tooth; 902. a first screw post; 903. a plate body; 10. a motor fixing plate; 1001. a first screw via hole; 1002. the motor fixing screw hole; 1003. a second screw hole; 11. mounting a plate; 1101. a first shaft hole; 1102. a second shaft hole; 1103. a base plate; 1104. a side plate; 1105. mounting a through hole; 12. a coil spring; 13. a coil spring fixing plate; 1301. a spring coiling groove; 1302. and a third screw hole.

Detailed Description

The technical solutions of the present invention will be described clearly and completely with reference to the accompanying drawings, and it should be understood that the described embodiments are some, but not all embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplicity of description, but do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.

In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.

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

Example 1

The embodiment provides a lifting driving device.

In one embodiment, as shown in fig. 1 to 12, the lifting driving device includes a lower tube 1, a stroke tube 3, a driving motor 5, a driving wheel 6, a driven wheel 7, and a transmission member 8. Wherein, the lower pipe 1 is suitable for being fixedly arranged on a chassis 2 of the fan; the stroke pipe 3 can be arranged on the lower pipe 1 in a lifting way, and the upper end of the stroke pipe 3 is suitable for installing a machine head 4 of the fan; the driving motor 5 is fixedly arranged on the stroke pipe 3; the driving wheel 6 is fixedly connected with a motor shaft of the driving motor 5; the driven wheel 7 is arranged on the stroke pipe 3; the driving wheel 6 and the driven wheel 7 are wound by the transmission part 8, when the driving wheel 6 rotates under the driving of the driving motor 5, the driven wheel 7 is driven to rotate through the transmission part 8, and the transmission part 8 is connected with the lower pipe 1 through the connecting part 9.

In this embodiment, when the driving motor 5 rotates forward, the driving member 8 is driven to rotate along a first preset direction, and since the driving member 8 is connected with the lower tube 1 and the position of the lower tube 1 is fixed, the local position of the driving member 8 connected with the lower tube 1 is unchanged, so that the driving motor 5, the driving wheel 6 and the driven wheel 7 are driven to ascend integrally, and 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 ascend; when driving motor 5 reverses, it rotates to drive driving medium 8 along the second direction of predetermineeing, because driving medium 8 links to each other with low tube 1, and the rigidity of low tube 1 is motionless, consequently, the local position of the driving medium 8 that links to each other with low tube 1 is unchangeable, thereby drive driving motor 5, action wheel 6, follow the whole decline of driving wheel 7, because driving motor 5, action wheel 6, follow driving wheel 7 and all set up on stroke pipe 3, consequently, drive stroke pipe 3 descends, and because connecting piece 9 links to each other driving medium 8 and low tube 1, stroke pipe 3 moves the optional position, all fix stroke pipe 3's position through this connecting piece 9, can realize the height of infinitely variable control aircraft nose 4. The first preset direction is one of a counterclockwise direction and a clockwise direction, and the second preset direction is the other of the counterclockwise direction and the clockwise direction. This embodiment drives stroke pipe 3 elevating movement through driving medium 8, and the cost is lower, and is lower to the processing technology requirement of spare part.

On the basis of the above-mentioned embodiments, in a preferred embodiment, the transmission member 8 has a first engaging tooth on its inner side, as shown in fig. 6, the connecting member 9 is provided with a second engaging tooth 901, the first engaging tooth is engaged with the second engaging tooth 901, and the connecting member 9 is fixedly connected with the lower pipe 1. In this embodiment, the connecting member 9 and the transmission member 8 are engaged and connected in a simple and convenient manner, thereby improving the assembling efficiency. In an alternative embodiment, the connection element 9 is screwed or snapped to the transmission element 8.

It should be noted that, when the inner side of the transmission member 8 has the first engaging tooth, the driving wheel 6 and the driven wheel 7 also have a third engaging tooth respectively matching with the first engaging tooth.

On the basis of the above embodiment, in a preferred embodiment, the connecting member 9 includes two first screw columns 902 arranged at intervals, the two first screw columns 902 are located at two sides of the transmission member 8, the top of the lower tube 1 is provided with first screw holes 101 corresponding to the first screw columns 902, and the connecting member 9 is connected with the lower tube 1 through screws. In this embodiment, after the assembly is completed, the two first screw posts 902 are located at two sides of the transmission member 8, the transmission member 8 is clamped between the two first screw posts 902, and the first screw posts 902 can guide the operation of the transmission member 8 to prevent the transmission member 8 from shifting.

In one embodiment, with reference to fig. 2 and 6, the connecting member 9 includes a plate body 903, the second engaging tooth 901 is located on one side of the plate body 903, the first screw column 902 is located on the other side of the plate body 903, the transmission member 8 includes a first portion and a second portion respectively located on the left and right sides of the driving wheel 6 and the driven wheel 7, the connecting member 9 is in engagement with the second portion, and the two first screw columns 902 are located on both sides of the first portion, in which embodiment, when the transmission member 8 rotates counterclockwise, the stroke tube 3 descends, and when the transmission member 8 rotates clockwise, the stroke tube 3 ascends. Of course, in other alternative embodiments, the second engagement tooth 901 and the first screw post 902 may be located on the same side of the plate body 903.

In addition to the above embodiments, in a preferred embodiment, a step surface 303 is provided in the stroke pipe 3, a motor fixing plate 10 is fixedly provided on the step surface 303, and the driving motor 5 is provided on the motor fixing plate 10. In this embodiment, the provision of the step surface 303 facilitates mounting and fixing the drive motor 5. In other alternative embodiments, the drive motor 5 is fastened directly to the inner wall of the travel tube 3 by means of screws.

In one embodiment, travel tube 3 includes a first tube segment 301 and a second tube segment 302, first tube segment 301 is positioned over second tube segment 302, first tube segment 301 has a diameter greater than a diameter of second tube segment 302, a step surface 303 is formed therebetween, and handpiece 4 is adapted to be mounted over first tube segment 301, first tube segment 301 has a length less than a length of second tube segment 302 to facilitate securing motor retaining plate 10 within travel tube 3. As shown in fig. 4, a plurality of first screw through holes 1001 distributed along the circumferential direction are formed in the motor fixing plate 10, 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 driving motor 5 is fixed in the motor fixing screw holes 1002 through screws.

On the basis of the above embodiments, in a preferred embodiment, the motor fixing plate 10 is fixedly connected with the mounting plate 11, the upper end of the mounting plate 11 is provided with a first shaft hole 1101 through which a motor shaft passes, the lower end of the mounting plate 11 is provided with a second shaft hole 1102 through which a rotating shaft of the driven wheel 7 passes, the motor shaft passes through the first shaft hole 1101 to be connected with the driving wheel 6, and the rotating shaft of the driven wheel 7 is arranged in the second shaft hole 1102. In this embodiment, through setting up mounting panel 11, can connect mounting panel 11, motor fixed plate 10, action wheel 6, follow driving wheel 7, driving medium 8 as an organic whole, install in stroke pipe 3 after connecting motor fixed plate 10, mounting panel 11, action wheel 6, follow driving wheel 7, driving medium 8 as an organic whole, be convenient for assemble.

As shown in fig. 4, two second screw holes 1003 are formed in the motor fixing plate 10, two mounting through holes 1105 are formed in the upper end of the mounting plate 11, and screws penetrate through the mounting through holes 1105 and are connected with the second screw holes 1003, so that the mounting plate 11 is fixed to the motor fixing plate 10. With further reference to fig. 4, the mounting plate 11 includes a bottom plate 1103 and side plates 1104 located at two sides of the bottom plate 1103, the upper ends of the two side plates 1104 are respectively provided with a first shaft hole 1101, the lower ends of the two side plates 1104 are respectively provided with a second shaft hole 1102, the driving wheel 6 and the driven wheel 7 are respectively located between the two side plates 1104, the motor shaft of the driving motor 5 passes through the first shaft hole 1101 and is fixedly connected with the central hole of the driving wheel 6, and the rotating shaft of the driven wheel 7 is rotatably located in the second shaft hole 1102.

In addition to the above embodiments, in a preferred embodiment, as shown in fig. 7, a slide groove 102 is provided in the lower tube 1, and the mounting plate 11 is slidably provided in the slide groove 102. In this embodiment, since the mounting plate 11 is slidably disposed in the chute 102, and the driving wheel 6, the driven wheel 7, the transmission member 8, and the motor fixing plate 10 are all connected to the mounting plate 11, the chute 102 can guide the lifting movement of the integrally connected mounting plate 11, the motor fixing plate 10, the driving wheel 6, the driven wheel 7, and the transmission member 8. The chute 102 has an opening provided in the peripheral wall of the lower tube 1, and the opening extends in the longitudinal direction of the lower tube 1, and the mounting plate 11 is mounted into the chute 102 through the opening when mounted.

On the basis of the above embodiments, in a preferred embodiment, as shown in fig. 2 and 3, the lifting driving device further includes a coil spring 12, a coil spring fixing plate 13 is fixedly connected to the lower end of the mounting plate 11, a body portion of the coil spring 12 is disposed in the coil spring fixing plate 13, a 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 at a position higher than that of the body portion. In this embodiment, when the stroke pipe 3 is lifted, the body part of the coil spring 12 is lifted along with the mounting plate 11, and the free end of the coil spring 12 has an upward thrust to the mounting plate 11, so that the gravity of the fan head 4 can be balanced, and the power consumption of the driving motor 5 during the lifting of the coil spring 12 is less.

Specifically, as shown in fig. 9, a coil spring groove 1301 is provided in the coil spring fixing plate 13, and a body portion of the coil spring 12 is provided in the coil spring groove 1301.

On the basis of the above embodiments, in a preferred embodiment, as shown in fig. 7, the lower tube 1 is provided with a catching groove 103, and the free end of the coil spring 12 is caught in the catching groove 103. In this embodiment, the free end of the coil spring 12 is simply and conveniently assembled with the lower tube 1.

On the basis of the above-described embodiment, in a preferred embodiment, the coil spring fixing plate 13 is fixedly connected with the stroke tube 3. In this embodiment, by fixedly connecting the coil spring fixing plate 13 with the stroke pipe 3, the synchronous belt assembly formed by integrally connecting the mounting plate 11, the motor fixing plate 10, the driving wheel 6, the driven wheel 7, the transmission member 8 and the coil spring fixing plate 13 with the stroke pipe 3 is fixedly connected, and the synchronous belt assembly is further ensured to be capable of driving the stroke pipe 3 to move up and down.

In one embodiment, as shown in fig. 9, a third screw hole 1302 is provided on the coil spring fixing plate 13, as shown in fig. 10, a second screw through hole 305 is provided on the tube wall of the stroke tube 3, and the coil spring fixing plate 13 and the stroke tube 3 are fixedly connected through a screw.

In addition to the above embodiments, in a preferred embodiment, the lifting driving device further includes a limiting structure for limiting the lifting stroke of the stroke pipe 3. In this embodiment, the limit structure is provided to limit the lifting stroke of the stroke pipe 3 and prevent the stroke pipe 3 from separating from the lower pipe 1.

In addition to the above embodiments, in a preferred embodiment, as shown in fig. 11 and 12, an annular limit boss 304 is provided in the stroke pipe 3, as shown in fig. 7 and 8, a plurality of sliding ribs 104 are provided on the outer side of the lower pipe 1, the limit boss 304 is located below the sliding rib 104, and when the limit boss 304 abuts against the lower end of the sliding rib 104, the stroke pipe 3 is raised to the highest height. In this embodiment, when the stopper boss 304 abuts against the lower end of the slide rib 104, the stopper boss 304 is stopped by the slide rib 104 and cannot continue upward, and thus the stroke pipe 3 cannot continue to be raised, and the stroke pipe 3 is prevented from coming off the lower pipe 1. In an alternative embodiment, the sliding ribs 104 on the outside of the lower tube 1 may be replaced by annular bosses.

In one embodiment, the sliding rib 104 is arranged at the top end of the lower pipe 1, the lower end of the stroke pipe 3 can be abutted against the chassis 2, when the lower end of the stroke pipe 3 is abutted against the chassis 2, the stroke pipe 3 descends to the lowest height, the chassis 2 limits the descending lowest height of the stroke pipe 3, and the sliding rib 104 and the chassis 2 are arranged so that the stroke pipe 3 has a larger lifting stroke.

On the basis of the above-described embodiment, in a preferred embodiment, the transmission member 8 is a conveyor belt. In this embodiment, the conveyor belt is less costly and requires less processing for each component. In an alternative embodiment, the transmission member 8 is a chain or a rope.

The lifting driving device provided by the embodiment has the following assembling process:

firstly, assembling to form a synchronous belt assembly, connecting a mounting plate 11 with a motor fixing plate 10 through screws, matching a driving wheel 6, a driven wheel 7 and a conveyor belt in belt transmission and mounting the driving wheel 6, the driven wheel 7 and the conveyor belt on the mounting plate 11, fixing a driving motor 5 on the motor fixing plate 10, enabling a motor shaft of the driving motor 5 to penetrate through a first shaft hole 1101 in the mounting plate 11 to be fixedly connected with the driving wheel 6, and assembling a coil spring fixing plate 13 below the driven wheel 7 through screws; then, the mounting plate 11 is assembled in the sliding groove 102 of the lower pipe 1, the connecting piece 9 is meshed with the lower pipe 1, and the connecting piece 9 is fixedly connected with the lower pipe 1 through a screw; fitting the body portion of the coil spring 12 into the coil spring groove 1301 and embedding the free end of the coil spring 12 into the card groove 103 of the lower tube 1; then, the stroke pipe 3 is sleeved outside the lower pipe 1 from bottom to top, and the motor fixing plate 10 is connected with the step surface 303 in the stroke pipe 3 through a screw, so that the lower pipe 1 and the stroke pipe 3 are concentrically matched.

Example 2

The present embodiment provides a fan, as shown in fig. 1 and 2, including a chassis 2, a machine head 4, and the lifting driving device provided in the above embodiments. Wherein, the lower pipe 1 is fixedly arranged on the chassis 2, and the machine head 4 is arranged on the stroke pipe 3.

It should be understood that the above examples are only for clarity of illustration and are not intended to limit the embodiments. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. And are neither required nor exhaustive of all embodiments. And obvious variations or modifications therefrom are within the scope of the utility model.

Claims (14)

1. A lift drive, comprising:

a lower tube (1) adapted to be fixedly mounted on a chassis (2) of the fan;

the stroke pipe (3) can be arranged on the lower pipe (1) in a lifting way, and the upper end of the stroke pipe (3) is suitable for installing a machine head (4) of a fan;

the driving motor (5) is fixedly arranged on the stroke pipe (3);

the driving wheel (6) is fixedly connected with a motor shaft of the driving motor (5);

a driven wheel (7) arranged on the stroke pipe (3);

driving wheel (6) with from outside driving wheel (7), driving wheel (6) are in when rotating under the drive of driving motor (5), through driving piece (8) drive from driving wheel (7) rotation, driving piece (8) with low tube (1) passes through connecting piece (9) and links to each other.

2. The lifting drive as claimed in claim 1, characterized in that the transmission element (8) has a first toothing on the inside, a second toothing (901) is provided on the connecting element (9), the first toothing is in meshing connection with the second toothing (901), and the connecting element (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) are located at two sides of the transmission member (8), the top of the lower pipe (1) is provided with a first screw hole (101) corresponding to the first screw columns (902), and the connecting member (9) is connected with the lower pipe (1) through screws.

4. The lifting driving device as claimed in claim 1, wherein a step surface (303) is provided in the stroke pipe (3), a motor fixing plate (10) is fixedly provided on the step surface (303), and the driving motor (5) is provided on the motor fixing plate (10).

5. The lifting driving device as claimed in claim 4, wherein a mounting plate (11) is fixedly connected to the motor fixing plate (10), a first shaft hole (1101) suitable for the motor shaft to pass through is formed in the upper end of the mounting plate (11), a second shaft hole (1102) suitable for the rotating shaft of the driven wheel (7) to be mounted is formed in the lower end of the mounting plate (11), the motor shaft passes through the first shaft hole (1101) to be connected with the driving wheel (6), and the rotating shaft of the driven wheel (7) is arranged in the second shaft hole (1102).

6. The lift drive as claimed in claim 5, characterized in that a slide groove (102) is provided in the lower tube (1), the mounting plate (11) being slidably arranged in the slide groove (102).

7. The lifting drive device according to claim 5 or 6, characterized in that the lifting drive device further comprises a coil spring (12), a coil spring fixing plate (13) is fixedly connected to the lower end of the mounting plate (11), a body part of the coil spring (12) is arranged in the coil spring fixing plate (13), a 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 at a position higher than the position of the body part.

8. The lifting drive as claimed in claim 7, characterized in that a latching groove (103) is provided on the lower tube (1), the free end of the coil spring (12) being latched in the latching groove (103).

9. The lifting drive as claimed in claim 7, characterized in that the coil spring retaining plate (13) is fixedly connected to the travel tube (3).

10. The lifting drive according to any of claims 1-6, characterized in that it further comprises a limiting structure for limiting the lifting travel of the travel tube (3).

11. The lifting driving device as claimed in claim 10, characterized in that an annular limiting boss (304) is provided in the stroke pipe (3), a plurality of sliding ribs (104) are provided on the outer side of the lower pipe (1) at intervals along the circumferential direction, the limiting boss (304) is located on the lower side of the sliding rib (104), and when the limiting boss (304) abuts against the lower end of the sliding rib (104), the stroke pipe (3) is lifted to the highest height.

12. The lifting drive as claimed in claim 11, characterized in that the slide bar (104) is arranged at the top end of the lower tube (1), the lower end of the travel tube (3) being able to abut against the chassis (2).

13. Lifting drive as defined in any one of claims 1-6, characterized in that the transmission element (8) is a conveyor belt.

14. A fan comprising the lift drive of any one of claims 1-13.

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