Lifting device and sweeper

Abstract

The utility model relates to the technical field of sweeping machines, in particular to a lifting device and a sweeping machine, the lifting device comprises a machine frame, a driving piece, a lead screw, a movable piece and a connecting piece, the driving piece is fixedly arranged on the machine frame, the lead screw is rotatably arranged on the machine frame, and the lead screw is in transmission connection with the driving piece. The movable part is slidably arranged on the rack and is in threaded connection with the lead screw, and the driving part can drive the movable part to slide through the lead screw. The connecting piece is used for being connected with a to-be-lifted piece, the connecting piece is in sliding connection with the rack, the connecting piece can abut against the movable piece, and the movable piece can push the connecting piece to slide. The lifting device can directly drive the driving assembly to wait for the lifting piece to ascend and descend relative to the machine frame, the obstacle crossing capacity of the driving assembly is improved, the driving assembly does not need to be matched with an additionally-arranged off-ground supporting mechanism, the driving assembly can keep an original movement mode, movement interference between the driving wheels is reduced, and the situation that the driving wheels turn over due to obstacle crossing is reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of sweeping machines, in particular to a lifting device and a sweeping machine. Background Art

[0002] When cleaning a house, the sweeper needs to climb stairs. It can easily climb ordinary stairs, but it will stop when it encounters stairs of a certain height and cannot overcome the obstacle.

[0003] In the related art, the sweeper needs to be equipped with a motor, multiple electric telescopic rods with rollers at the ends and other accessories. When it is necessary to overcome an obstacle, the electric telescopic rod is controlled by the motor to extend, and the body of the sweeper is lifted off the ground, and the obstacle is overcome in cooperation with the sweeper's own drive wheels. However, multiple accessories such as the motor and multiple electric telescopic rods will increase the structural complexity and weight of the sweeper. Moreover, when the sweeper overcomes an obstacle, the movement between the electric telescopic rod and the sweeper's own drive wheels is not uniform, and the sweeper is prone to overturning. Utility Model Content

[0004] The purpose of the utility model is to provide a lifting device and a sweeper to solve the problem in the related art that the sweeper needs to be equipped with additional components such as an electric telescopic rod to overcome obstacles, which easily causes motion interference between the sweeper and the driving wheel of the sweeper, making the sweeper prone to overturning when overcoming obstacles.

[0005] To achieve this purpose, the present invention adopts the following technical solutions:

[0006] In a first aspect, the present invention provides a lifting device, which comprises:

[0007] frame;

[0008] A driving member, wherein the driving member is fixedly arranged on the frame;

[0009] A lead screw, the lead screw being rotatably disposed on the frame and being in transmission connection with the driving member;

[0010] A movable member, wherein the movable member is slidably disposed on the frame and is threadably connected to the lead screw, and the driving member can drive the movable member to slide via the lead screw;

[0011] A connecting member is used to connect with the member to be lifted, the connecting member is slidably connected to the frame, and the connecting member can abut against the movable member, and the movable member can push the connecting member to slide.

[0012] In one embodiment, a guide groove is provided on the frame, and the guide groove extends along the vertical direction. The connecting member is inserted into the guide groove and can slide relative to the guide groove.

[0013] In one embodiment, the guide groove is a straight groove or an arc groove, and the guide groove has a first end and a second end. In the radial direction of the screw, the distance between the first end of the guide groove and the screw is smaller than the distance between the second end of the guide groove and the screw.

[0014] In one embodiment, a limiting groove is provided on the movable part, the connecting part is inserted into the limiting groove and can slide relative to the limiting groove, and the sliding direction of the connecting part and the limiting groove intersects with the sliding direction of the connecting part and the guide groove.

[0015] In one embodiment, one or more guide rods are provided on the frame, the axial extension direction of the guide rods is the same as the axial extension direction of the screw, and a connecting hole is provided on the movable part, and the guide rods can be inserted into the connecting hole and can slide relatively.

[0016] In one embodiment, the frame includes a frame body and a bracket connected to each other, the driving member is arranged in the bracket, and the bracket is arranged on the frame body.

[0017] In one embodiment, a protrusion is provided on the movable member, and a recess is provided on the bracket, and the protrusion can extend into the recess and abut against the recess.

[0018] In one embodiment, a sleeve is fixedly provided at the end of the lead screw, and the sleeve is rotatably connected to the bracket. The driving member has a driving shaft, and the driving shaft is passed through the sleeve and fixedly connected to the sleeve.

[0019] In a second aspect, the utility model provides a sweeping machine, comprising a driving assembly and a lifting device according to any of the above-mentioned solutions, wherein the lifting device is connected to the driving assembly.

[0020] In one embodiment, the drive assembly includes a mounting frame and a drive wheel, the drive wheel is rotatably disposed on the mounting frame, a rotating shaft is provided on the mounting frame, the mounting frame can be rotatably connected to the frame via the rotating shaft, the mounting frame is connected to the connecting member, and the connecting member can apply a vertical force to the mounting frame.

[0021] The beneficial effects of the utility model are:

[0022] The utility model provides a lifting device and a sweeper, both of which include a frame, a driving member, a screw, a movable member and a connecting member. When the lifting member needs to be lowered relative to the frame, the driving member can drive the screw to rotate in the positive direction, and the screw drives the movable member to move downward along the axial direction of the screw through the connecting thread, so that the movable member slides downward relative to the frame. The sliding of the movable member can push the connecting member to slide downward, so that the connecting member drives the driving wheel to wait for the lifting member to move downward away from the frame, the ground clearance height of the frame can be increased, the effective obstacle crossing height of the driving wheel can also be increased, and the obstacle crossing performance of the driving wheel is improved. Moreover, the driving wheel does not need to cooperate with a separately provided ground-lift support mechanism, and the driving wheel can maintain the original movement mode, thereby reducing the movement interference between the driving wheels and the frequent occurrence of overturning when crossing obstacles. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 This is a schematic diagram of the installation position of the lifting device in the embodiment of the utility model;

[0024] Figure 2 This is a schematic structural diagram of the lifting device in an embodiment of the present utility model;

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

[0026] Figure 4 This is a structural diagram of the movable parts in the embodiment of the utility model;

[0027] Figure 5 Schematic diagram of the connection relationship between the lifting device and the drive assembly in an embodiment of the present utility model.

[0028] In the picture:

[0029] 1. Frame; 11. Guide groove; 12. Guide rod; 13. Frame body; 14. Bracket; 15. Recessed portion;

[0030] 2. Driving member; 21. Driving shaft;

[0031] 3. Screw; 31. Sleeve;

[0032] 4. Movable part; 41. Limiting groove; 42. Connecting hole; 43. Protrusion;

[0033] 5. Connectors;

[0034] 6. Drive assembly; 61. Mounting frame; 62. Drive wheel. DETAILED DESCRIPTION

[0035] The present invention will be further described in detail below with reference to the accompanying drawings and examples. It should be understood that the specific embodiments described herein are intended only to illustrate the present invention and are not intended to limit the present invention. It should also be noted that, for ease of description, the accompanying drawings only illustrate portions relevant to the present invention, not all of its components.

[0036] In the description of this utility model, unless otherwise specified or limited, the terms "connected," "connect," and "fixed" should be understood in a broad sense. For example, they can refer to fixed connection, detachable connection, or integration; mechanical connection or electrical connection; direct connection or indirect connection through an intermediate medium; internal communication between two components or interaction between two components. Those skilled in the art will understand the specific meanings of the above terms in this utility model based on the specific circumstances.

[0037] In the present invention, unless otherwise expressly specified or limited, a first feature being "above" or "below" a second feature may include the first and second features being in direct contact, or may include the first and second features being in contact not directly but through another feature between them. Moreover, a first feature being "above," "above," and "above" a second feature may include the first feature being directly above or obliquely above the second feature, or may simply mean that the first feature is higher in level than the second feature. A first feature being "below," "below," and "below" a second feature may include the first feature being directly below or obliquely below the second feature, or may simply mean that the first feature is lower in level than the second feature.

[0038] In the description of this embodiment, terms such as "upper," "lower," "left," and "right" are used to refer to positions or locations based on the positions or locations shown in the accompanying drawings. These terms are intended solely to facilitate description and simplify operation, and are not intended to indicate or imply that the devices or components referred to must have, be constructed, or operate in a specific orientation. Therefore, they should not be construed as limitations on this invention. Furthermore, the terms "first" and "second" are used solely for descriptive purposes and have no special meaning.

[0039] like Figures 1 to 3As shown, an embodiment of the first aspect of the present invention provides a lifting device, which includes a frame 1, a driving member 2, a screw 3, a movable member 4 and a connecting member 5. The driving member 2 is fixedly arranged on the frame 1, and the driving member 2 can be supported by the frame 1. The screw 3 is rotatably arranged on the frame 1, and the screw 3 is transmission-connected to the driving member 2, and the driving member 2 can drive the screw 3 to rotate. The movable member 4 is slidably arranged on the frame 1, and the movable member 4 is threadedly connected to the screw 3, and the driving member 2 can drive the movable member 4 to slide through the screw 3. The connecting member 5 is used to connect with the member to be lifted, and the connecting member 5 is slidably connected to the frame 1, and the connecting member 5 can abut against the movable member 4, and the movable member 4 can push the connecting member 5 to slide.

[0040] With such arrangement, the lifting device can be connected to the part to be lifted. When the part to be lifted needs to descend relative to the frame 1, the driving part 2 can drive the screw 3 to rotate in the positive direction. The screw 3 drives the movable part 4 to move downward along the axial direction of the screw 3 through the connecting thread, so that the movable part 4 slides downward relative to the frame 1. The sliding of the movable part 4 can push the connecting part 5 to slide downward, so that the connecting part 5 drives the part to be lifted downward away from the frame 1. The height of the frame 1 from the ground can be increased, and the effective working height of the part to be lifted can also be increased.

[0041] When the object to be lifted needs to be raised relative to the frame 1, the driving member 2 can drive the lead screw 3 to rotate in the opposite direction. The lead screw 3 drives the movable member 4 to move upward along the axial direction of the lead screw 3 through the connecting thread, so that the movable member 4 slides upward relative to the frame 1. Under the action of the gravity of the frame 1 and other components, the movable member 4 can maintain contact with the connecting member 5, and the connecting member 5 can drive the object to be lifted upward toward the frame 1, thereby reducing the height of the frame 1 from the ground and the effective height of the object to be lifted. Therefore, the object to be lifted can be raised and lowered relative to the frame 1 according to the needs of the user. The adjustment is convenient and the threaded transmission between the lead screw 3 and the movable member 4 can adjust the lifting motion with high precision. The object to be lifted can be, but is not limited to, a drive wheel 62. The drive wheel 62 can be directly raised and lowered relative to the frame 1, thereby increasing the obstacle surmounting capability of the drive wheel 62. Moreover, the drive wheel 62 does not need to cooperate with a separate ground-lift support mechanism. The drive wheel 62 can maintain its original motion mode, reducing the motion interference between the drive wheels 62 and reducing the frequent occurrence of overturning when surmounting obstacles.

[0042] In this embodiment, the driving member 2 can be, but is not limited to, a motor, a rotary cylinder, or a rotary hydraulic cylinder, and can drive the screw 3 to rotate. The movable member 4 can be, but is not limited to, a block-shaped, plate-shaped, or shell-shaped structure, and can be slidably connected to the frame 1 and slide under the drive of the driving member 2 and the screw 3. The sliding direction of the connecting member 5 and the frame 1 can be along the vertical direction. For example, the sliding direction of the connecting member 5 and the frame 1 can be along the vertical direction or have a certain angle with the vertical direction, and the motion vector of the connecting member 5 relative to the frame 1 can have a component along the vertical direction. The relative sliding between the connecting member 5 and the frame 1 can be achieved by providing a guide groove 11 or by providing a combination structure of a guide rail and a slider, so that the connecting member 5 can slide smoothly relative to the frame 1.

[0043] like Figures 1 to 3 As shown, in some embodiments, a guide groove 11 is provided on the frame 1, and the guide groove 11 is extended in the vertical direction. The connecting member 5 is passed through the guide groove 11 and can slide relative to the guide groove 11. In this way, the connecting member 5 can pass through the guide groove 11 on the frame 1, and can separate the movable member 4 and the member to be lifted on the inner and outer sides of the frame 1. One end of the connecting member 5 can be fixedly connected to the member to be lifted, and the other end of the connecting member 5 can abut against the movable member 4 after passing through the guide groove 11. The movable member 4 applies force to the connecting member 5 to push the connecting member 5 to slide in the guide groove 11.

[0044] In this embodiment, the connecting member 5 can be, but is not limited to, a rod, block, or plate-shaped member, as long as it can drive the object to be lifted. The cross-sectional shape of the connecting member 5 can be, but is not limited to, circular, elliptical, or polygonal. When the connecting member 5 needs to rotate relative to the guide groove 11, the cross-sectional shape of the connecting member 5 can be circular.

[0045] The connector 5 may be provided with an extension block, which may be provided on the upper or lower surface of the connector 5. When the connector 5 slides to the upper and lower boundaries of the guide groove 11, the extension block can abut against the upper and lower boundaries of the guide groove 11, thereby reducing the connection area between the connector 5 and the upper and lower boundaries of the guide groove 11. The extension block can be made of an elastic material and can provide a buffering and vibration reduction effect on the fit between the connector 5 and the groove wall of the guide groove 11.

[0046] like Figures 2 to 3As shown, in some embodiments, the guide groove 11 is a straight groove or an arc groove, and the guide groove 11 has a first end and a second end. In the radial direction of the screw 3, the distance between the first end of the guide groove 11 and the screw 3 is smaller than the distance between the second end of the guide groove 11 and the screw 3. In this way, the guide groove 11 extends in the vertical direction, and the guide groove 11 can be designed as an oblique groove with the first end close to the screw 3 and the second end away from the screw 3. It can provide sufficient movement space for the connecting member 5, reduce the interference between the movement of the connecting member 5 and the guide groove 11 and the movement of the part to be lifted, and make the relative movement of the connecting member 5 and the guide groove 11 smooth to avoid jamming. Moreover, when the part to be lifted is impacted, the groove wall of the guide groove 11 and the movable part 4 can jointly withstand the impact force, disperse the stress, and improve the stability of movement.

[0047] like Figures 2 to 4 As shown, in some embodiments, a limiting groove 41 is provided on the movable member 4, and the connecting member 5 is inserted into the limiting groove 41 and can slide relative to the limiting groove 41. The sliding direction of the connecting member 5 and the limiting groove 41 intersects with the sliding direction of the connecting member 5 and the guide groove 11, that is, the sliding direction of the connecting member 5 and the limiting groove 41 is different from the sliding direction of the connecting member 5 and the guide groove 11, and the two have an angle, for example, the angle between the two directions can be a right angle or an acute angle. The limiting groove 41 can extend along the radial direction of the screw 3 and have a certain width to provide sufficient space for the connecting member 5 to move, thereby reducing interference between the sliding movement of the connecting member 5 and the limiting groove 41 and the sliding movement of the connecting member 5 and the guide groove 11.

[0048] like Figures 2 to 3 As shown, in some embodiments, one or more guide rods 12 are provided on the frame 1, and the axial extension direction of the guide rod 12 is the same as the axial extension direction of the screw 3. A connecting hole 42 is provided on the movable part 4, and the guide rod 12 can be inserted into the connecting hole 42 and can slide relatively. The movable part 4 is sleeved on the guide rod 12 to achieve relative sliding with the frame 1. The connection area between the guide rod 12 and the connecting hole 42 is large, and the sliding process is stable.

[0049] Among them, when there are multiple guide rods 12, the multiple guide rods 12 can be arranged on both sides of the connecting member 5, so that the guide rods 12 on both sides of the connecting member 5 can be evenly stressed and the sliding movement of the movable member 4 relative to the frame 1 is smoother.

[0050] In this embodiment, the cross-sectional shape of the guide rod 12 may be, but is not limited to, circular, elliptical or polygonal, and can be configured according to usage requirements.

[0051] like Figures 1 to 3As shown, in some embodiments, the frame 1 includes a frame body 13 and a bracket 14 connected to each other. The driving member 2 is disposed within the bracket 14, and the bracket 14 can protect the driving member 2. The bracket 14 is disposed on the frame body 13. The connection between the bracket 14 and the frame body 13 can be, but is not limited to, a detachable connection. For example, the connection between the bracket 14 and the frame body 13 can be integrally formed, bolted, snap-fit, or magnetically connected, facilitating installation, removal, maintenance, and replacement. Furthermore, the bracket 14 can support the driving member 2 from the surface of the frame body 13, thereby providing ample space for the arrangement of the lead screw 3 and the movable member 4.

[0052] like Figures 2 to 4 As shown, in some embodiments, a protrusion 43 is provided on the movable part 4, and a recessed part 15 is provided on the bracket 14. The protrusion 43 can extend into the recessed part 15 and abut against the recessed part 15. When the movable part 4 slides to the upper end of the screw 3, the movable part 4 can contact the bracket 14, and the top of the movable part 4 and the bottom of the bracket 14 are provided with the plug-in protrusion 43 and the recessed part 15, which can increase the connection and matching area between the movable part 4 and the bracket 14, facilitate the dispersion of force, and also increase the connection stability between the movable part 4 and the bracket 14 in the bracket 14, thereby avoiding displacement and shaking between the movable part 4 and the bracket 14.

[0053] like Figures 2 to 3 As shown, in some embodiments, a sleeve 31 is fixedly provided at the end of the screw 3, and the diameter of the sleeve 31 may be larger than the diameter of the screw 3. The sleeve 31 is rotatably connected to the bracket 14, and the driving member 2 has a driving shaft 21. The driving shaft 21 is passed through the sleeve 31 and is fixedly connected to the sleeve 31. The driving shaft 21 drives the sleeve 31 to rotate, which can drive the screw 3 to rotate. By providing the sleeve 31, the connection and matching area between the screw 3 and the driving member 2 can be increased, thereby improving the rotation stability.

[0054] It should be noted that the end of the lead screw 3 close to the driver 2 is rotatably connected to the bracket 14, and the end of the lead screw 3 away from the driver 2 can be a free end, suspended to facilitate the installation and disassembly of the movable member 4. The movable block is connected to both the guide rod 12 and the lead screw 3, and the lead screw 3 can cooperate with the guide rod 12 for support to reduce shaking. Of course, the end of the lead screw 3 away from the driver 2 can also be rotatably connected to the frame body 13 to improve the rotational stability of the lead screw 3 and further reduce shaking. In addition, bearings can be provided between the sleeve 31 and the bracket 14 and between the lead screw 3 and the bracket 14 to improve rotation sensitivity. The drive shaft 21 and the sleeve 31 can be keyed, or a limited surface can be provided on the side wall of the drive shaft 21, and the limited surface abuts against the sleeve 31 to reduce the relative rotation between the drive shaft 21 and the sleeve 31.

[0055] like Figures 1 to 3 as well as Figure 5As shown, an embodiment of the second aspect of the present invention provides a sweeper, which includes a drive assembly 6 and a lifting device in any of the above-mentioned schemes. The lifting device is connected to the drive assembly 6, that is, the lifting device can directly drive the drive assembly 6 to lift and lower, and directly lift the drive assembly 6 relative to the frame 1, thereby increasing the obstacle-crossing ability of the drive assembly 6. Moreover, the drive assembly 6 does not need to cooperate with a separately provided off-ground support mechanism. The drive assembly 6 can maintain its original movement mode, reduce the movement interference between each drive wheel 62, and reduce the frequent occurrence of overturning when overturning when overturning due to obstacles. It avoids the need for the sweeper in the related art to have additional components such as electric telescopic rods to overcome obstacles, which easily form movement interference with the drive wheel 62 of the sweeper, making the sweeper prone to overturning when overturning when overturning due to obstacles.

[0056] In some embodiments, the sweeper may further include a universal wheel, which is rotatably mounted at the bottom of the frame 1. The drive member 2, lead screw 3, movable member 4, and connector 5 may be arranged in groups, and at least two groups may be provided, one on each side of the universal wheel, to facilitate the synchronous lifting and lowering of the drive assemblies 6 on both sides of the universal wheel. The number of drive members 2, lead screw 3, movable member 4, and connector 5 can be arranged accordingly based on the number of drive assemblies 6, to facilitate the synchronous lifting and lowering of the drive assemblies 6. Of course, the drive member 2, lead screw 3, movable member 4, and connector 5 can also be arranged in combination with the universal wheel to control the lifting and lowering of the universal wheel, and the arrangement can be based on actual needs.

[0057] like Figures 1 to 3 as well as Figure 5 As shown, in some embodiments, the driving assembly 6 includes a mounting frame 61 and a driving wheel 62. The driving wheel 62 is rotatably set on the mounting frame 61. A rotating shaft is provided on the mounting frame 61. The mounting frame 61 can be rotatably connected to the frame 1 through the rotating shaft. The mounting frame 61 is connected to the connecting member 5, and the connecting member 5 can apply a vertical force to the mounting frame 61. With this arrangement, when the driving assembly 6 needs to descend with respect to the frame 1, the driving member 2 can drive the screw 3 to rotate in the positive direction, and the screw 3 drives the movable member 4 to move downward along the axial direction of the screw 3 through the connecting thread, so that the movable member 4 slides downward relative to the frame 1. The sliding of the movable member 4 can push the connecting member 5 to slide downward, so that the connecting member 5 drives the mounting frame 61 downward away from the frame 1, thereby driving the driving wheel 62 downward away from the frame 1. The support height of the driving wheel 62 on the frame 1 is increased, so that the height of the frame 1 from the ground can be increased, and the effective obstacle crossing height of the driving wheel 62 can also be increased, with good obstacle crossing performance.

[0058] When the driving assembly 6 needs to rise relative to the frame 1, the driving member 2 can drive the screw 3 to rotate in the opposite direction, and the screw 3 drives the movable member 4 to move upward along the axial direction of the screw 3 through the connecting thread, so that the movable member 4 slides upward relative to the frame 1. Under the action of gravity of the frame 1 and other components, the movable member 4 can maintain contact with the connecting member 5, and the connecting member 5 can drive the mounting frame 61 upward to the frame 1. The support height of the driving wheel 62 on the frame 1 is reduced, the height of the frame 1 from the ground is reduced, and the effective working height of the driving wheel 62 can also be reduced, so that the normal driving state can be restored after overcoming the obstacle.

[0059] The sweeper of this embodiment drives the driving assembly 6 to rise and fall by setting a lifting device, which can meet the needs of the sweeper to overcome obstacles at different heights. It is easy to adjust and use, and the lifting movement is adjusted with high accuracy through the threaded transmission between the screw 3 and the movable part 4.

[0060] Obviously, the above-described embodiments of the present invention are merely examples for the purpose of clearly illustrating the present invention and are not intended to limit the manner in which the present invention is to be implemented. A person skilled in the art would be able to make various obvious changes, readjustments, and substitutions without departing from the scope of protection of the present invention. It is not necessary and impossible to enumerate all embodiments here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention shall be included within the scope of protection of the claims of the present invention.

Claims

1. A lifting device, characterized in that: The lifting device comprises: Rack (1); A driving member (2), wherein the driving member (2) is fixedly arranged on the frame (1); A lead screw (3), the lead screw (3) being rotatably arranged on the frame (1), and the lead screw (3) being transmission-connected to the driving member (2); A movable member (4), the movable member (4) being slidably disposed on the frame (1), and the movable member (4) being threadedly connected to the lead screw (3), and the driving member (2) being able to drive the movable member (4) to slide via the lead screw (3); A connecting member (5) is used to connect with the member to be lifted, the connecting member (5) is slidably connected to the frame (1), and the connecting member (5) can abut against the movable member (4), and the movable member (4) can push the connecting member (5) to slide.

2. The lifting device according to claim 1, characterized in that: A guide groove (11) is provided on the frame (1), and the guide groove (11) extends in a vertical direction. The connecting member (5) is inserted into the guide groove (11) and can slide relative to the guide groove (11).

3. The lifting device according to claim 2, characterized in that: The guide groove (11) is a straight groove or an arc groove, and the guide groove (11) has a first end and a second end. In the radial direction of the lead screw (3), the distance between the first end of the guide groove (11) and the lead screw (3) is smaller than the distance between the second end of the guide groove (11) and the lead screw (3).

4. The lifting device according to claim 3, characterized in that: A limiting groove (41) is provided on the movable member (4), the connecting member (5) is inserted into the limiting groove (41) and can slide relative to the limiting groove (41), and the sliding direction of the connecting member (5) and the limiting groove (41) intersects with the sliding direction of the connecting member (5) and the guide groove (11).

5. The lifting device according to claim 1, characterized in that: One or more guide rods (12) are provided on the frame (1), and the axial extension direction of the guide rods (12) is the same as the axial extension direction of the lead screw (3). The movable part (4) is provided with a connecting hole (42), and the guide rods (12) can be inserted into the connecting hole (42) and can slide relatively.

6. The lifting device according to claim 1, characterized in that: The frame (1) comprises a frame body (13) and a bracket (14) connected to each other, the driving member (2) is arranged in the bracket (14), and the bracket (14) is arranged on the frame body (13).

7. The lifting device according to claim 6, characterized in that: The movable part (4) is provided with a raised portion (43), and the bracket (14) is provided with a recessed portion (15). The raised portion (43) can extend into the recessed portion (15) and abut against the recessed portion (15).

8. The lifting device according to claim 7, characterized in that: A sleeve (31) is fixedly provided at the end of the lead screw (3), and the sleeve (31) is rotatably connected to the bracket (14). The driving member (2) has a driving shaft (21), and the driving shaft (21) is passed through the sleeve (31) and fixedly connected to the sleeve (31).

9. A sweeping machine, characterized in that: It comprises a driving assembly (6) and a lifting device according to any one of claims 1 to 8, wherein the lifting device is connected to the driving assembly (6).

10. The sweeping machine according to claim 9, characterized in that: The drive assembly (6) includes a mounting frame (61) and a driving wheel (62). The driving wheel (62) is rotatably arranged on the mounting frame (61). A rotating shaft is provided on the mounting frame (61). The mounting frame (61) can be rotatably connected to the frame (1) via the rotating shaft. The mounting frame (61) is connected to the connecting member (5). The connecting member (5) can apply a vertical force to the mounting frame (61).

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