Driving assembly for driving gear to rotate, lifting roller assembly and movable device

Abstract

The invention relates to the technical field of movable devices, in particular to a driving assembly for driving a gear to rotate, a lifting roller assembly and a movable device, and aims to solve the problem that when large equipment is moved, bottom feet of the large equipment are prone to abrasion. In order to achieve the purpose, the driving assembly for driving the gear to rotate comprises a fixing piece, a first push rod and a second push rod. The lifting roller assembly comprises a roller body, a connecting shaft and a first driving assembly. The movable device provided by the invention comprises the liftable roller assembly. The second push rod can push the gear to rotate. The driving assembly can achieve lifting of the wheel body. The lifting rolling wheel assembly is arranged on the movable device, when the lifting rolling wheel assembly needs to be moved, the wheel body descends, the bottom feet ascend to be separated from the ground, abrasion between the bottom feet and the ground can be prevented, and the movable device can be conveniently moved.

Description

Technical Field

[0001] The present invention relates to the technical field of movable devices, and in particular provides a driving assembly for driving gears to rotate, a lifting roller assembly and a movable device. Background Art

[0002] In the prior art, large-scale equipment such as clothing care machines are equipped with two fixed feet on the front and two wheels on the rear. To move the clothing care machine, the machine is first tilted to lift the front fixed feet off the ground, and then the two wheels are used to push the machine. However, during this operation, the fixed feet are still susceptible to wear and tear from the ground.

[0003] Therefore, there is an urgent need in the art for a driving assembly for driving the gears to rotate, a lifting roller assembly and a movable device to solve the above problems. Summary of the Invention

[0004] The present invention aims to solve the above technical problem, that is, to solve the problem that the base of large equipment is easily worn when it is moved.

[0005] In a first aspect, the present invention provides a drive assembly for driving a gear to rotate, the drive assembly comprising: a fixing member, a first push rod and a second push rod;

[0006] The first push rod is slidably connected to the fixing member, and the first end of the second push rod is rotatably connected to the first push rod;

[0007] When the first push rod slides in the first direction, the second end of the second push rod can extend into the inter-tooth groove of the gear, so that the second push rod can push the gear to rotate.

[0008] In a specific embodiment of the above-mentioned driving assembly, a limiting portion is provided on the first push rod;

[0009] When the second end of the second push rod extends into the inter-tooth groove of the gear, the limiting portion can abut against the first end of the second push rod, so that the second push rod can push the gear to rotate.

[0010] In a specific embodiment of the above-mentioned drive assembly, the drive assembly further includes:

[0011] a first elastic member, one end of which is connected to the first push rod, and the other end of which is connected to the second push rod;

[0012] When the first push rod slides in the second direction, the second push rod can be withdrawn from the inter-tooth groove, and the first elastic member can reset the second push rod that has withdrawn from the inter-tooth groove;

[0013] The first direction is opposite to the second direction.

[0014] In a specific embodiment of the above-mentioned drive assembly, the drive assembly further includes:

[0015] a second elastic member, one end of which is connected to the fixing member and the other end of which is connected to the first push rod;

[0016] When the first push rod slides in the first direction, the second elastic member can drive the first push rod to slide in the second direction.

[0017] In a second aspect, the present invention provides a lifting roller assembly, the lifting roller assembly comprising:

[0018] wheel body;

[0019] A connecting shaft connected to the wheel body, wherein the connecting shaft is provided with a thread and a gear;

[0020] The first driving assembly is the above-mentioned driving assembly for driving the gear to rotate. The first driving assembly can drive the gear to rotate in a third direction so that the wheel body moves along the axial direction of the thread.

[0021] In a specific embodiment of the above roller assembly, the roller assembly further includes:

[0022] A connecting member, the wheel body is rotatably connected to the connecting member, and the connecting shaft is rotatably connected to the connecting member;

[0023] When the connecting shaft moves along the thread, the wheel body can move along the axial direction of the thread.

[0024] In a specific embodiment of the above roller assembly, the roller assembly further includes:

[0025] The second driving assembly is the above-mentioned driving assembly for driving the gear to rotate. The second driving assembly can drive the gear to rotate in a fourth direction, and the third direction is opposite to the fourth direction.

[0026] In a third aspect, the present invention provides a movable device comprising the above-mentioned liftable roller assembly.

[0027] In a specific embodiment of the above movable device, the movable device further includes a device body;

[0028] The connecting shaft is connected to the device body via the thread.

[0029] In a specific embodiment of the above movable device, the movable device further includes:

[0030] The device body has two feet on the front side of its bottom and two casters on the rear side of its bottom, and the roller assembly is arranged between the two feet.

[0031] When the above technical solution is adopted, the first push rod of the drive assembly of the present invention can slide, allowing the second push rod to extend into the groove between the protruding teeth of the gear, so that the second push rod can push the gear to rotate. The drive assembly can drive the gear on the connecting shaft of the lifting roller assembly to rotate, causing the connecting shaft to rotate along the thread, so that the wheel body moves along the axis of the thread, thereby achieving the lifting and lowering of the wheel body. The lifting roller assembly is set on the movable device. When movement is required, the wheel body is lowered and the base is raised to be clear of the ground. This can prevent wear between the base and the ground and facilitate the movement of the movable device. When movement is no longer required, the wheel body can be raised, and the movable device can be supported by the base, so that the movable device is fixed to the ground.

[0032] Furthermore, the first push rod is provided with a limiting portion. When the second end of the second push rod extends into the inter-tooth groove of the gear, the limiting portion can abut the first end of the second push rod, so that the second push rod can push the gear to rotate.

[0033] Furthermore, when the second push rod exits the inter-tooth groove, the first elastic member can reset the second push rod. The first push rod repeatedly slides in the first direction and the second direction, so that the second push rod can continuously push the gear to rotate.

[0034] Furthermore, after the first push rod slides in the first direction, the second elastic member can drive the first push rod to slide in the second direction, so that the first push rod is quickly reset, making the operation process of the drive assembly more convenient.

[0035] Furthermore, the lifting roller assembly is provided with a first drive assembly and a second drive assembly, wherein the first drive assembly can drive the gear to rotate in the third direction, and the second drive assembly can drive the gear to rotate in the fourth direction. The two drive assemblies can control the wheel body to rise and fall. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] The preferred embodiments of the present invention are described below with reference to the accompanying drawings, in which:

[0037] Figure 1 It is a structural schematic diagram of the movable device provided by the present invention;

[0038] Figure 2 1 is a schematic front view of the bottom structure of the movable device provided by the present invention, wherein the lifting roller assembly is in an ascending state;

[0039] Figure 3 is a schematic side view of the bottom structure of the movable device provided by the present invention, wherein the lifting roller assembly is in a lowered state;

[0040] Figure 4 1 is a side structural diagram of the lifting roller assembly provided by the present invention;

[0041] Figure 5 1 is a schematic top view of the lifting roller assembly provided by the present invention, showing a state in which the second push rod on the left side pushes the gear to rotate clockwise;

[0042] Figure 6 1 is a schematic top view of the internal structure of the lifting roller assembly provided by the present invention, showing the internal structure of the fixing member, the first drive assembly, and the second drive assembly. The figure shows the state in which the second push rod on the left side pushes the gear to rotate clockwise;

[0043] Figure 7 1 is a schematic structural diagram of the lifting roller assembly provided by the present invention. The figure does not show the fixing member. The figure shows the state where the second push rod on the left side pushes the gear to rotate clockwise.

[0044] Figure 8 is a schematic structural diagram of the gear and the first drive assembly in the first state provided by the present invention;

[0045] Figure 9 2 is a schematic structural diagram of the gear and the first drive assembly in the second state provided by the present invention, wherein the straight arrows in the figure indicate the moving directions of the first push rod on the left and the second push rod on the left, and the curved arrows in the figure indicate the rotational direction of the gear;

[0046] Figure 10 It is a structural schematic diagram of the gear and the first drive assembly in the third state provided by the present invention. The straight arrows in the figure indicate the moving directions of the first push rod on the left and the second push rod on the left, and the curved arrows in the figure indicate the rotation direction of the second push rod on the left.

[0047] List of reference numerals:

[0048] 1. Fixing parts;

[0049] 2. Lifting roller assembly; 21. Wheel body; 22. Connecting shaft; 221. Gear; 23. Connecting piece; 24. Second bearing;

[0050] 31. Device body; 32. Foot; 33. Casters;

[0051] 41. Left first push rod; 411. Left limiter; 42. Left second push rod; 421. Left protrusion; 43. Left first elastic member; 44. Left second elastic member; 45. Left slot; 46. Left hinge shaft;

[0052] 51. First push rod on the right side; 511. Right limiting portion; 52. Second push rod on the right side; 521. Right protruding portion; 53. First elastic member on the right side; 54. Second elastic member on the right side; 55. Right slot; 56. Right hinge shaft. DETAILED DESCRIPTION

[0053] The preferred embodiments of the present invention are described below with reference to the accompanying drawings. It should be understood by those skilled in the art that these embodiments are only used to explain the technical principles of the present invention and are not intended to limit the scope of protection of the present invention.

[0054] It should be noted that in the description of the present invention, terms such as "upper," "lower," "left," "right," "inner," and "outer" indicating directions or positional relationships are based on the directions or positional relationships shown in the accompanying drawings. These terms are used solely for ease of description and are not intended to indicate or imply that the device or component described must have, be constructed, or operate in a specific orientation. Therefore, they should not be construed as limitations on the present invention. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0055] Furthermore, it should be noted that, in the description of the present invention, unless otherwise expressly specified or limited, the terms "installed," "disposed," and "connected" should be understood in a broad sense. For example, they may refer to fixed connections, detachable connections, or integral connections; they may refer to direct connections, indirect connections through an intermediate medium, or 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 the specific circumstances.

[0056] To address the issue of feet being easily worn when moving large equipment, this embodiment discloses a movable device, specifically a clothing care machine. Those skilled in the art will appreciate that in other embodiments, the movable device may also be a washing machine, a cabinet air conditioner, a refrigerator, or other large appliances.

[0057] Reference Figures 1 to 3 The movable device includes a device body 31, two feet 32, two casters 33 and a lifting roller assembly 2. The bottom surface of the device body 31 is approximately rectangular. The two feet 32 ​​are arranged at the two corners of the bottom front side of the device body 31, and the two casters 33 are arranged at the two corners of the rear side of the bottom surface of the device body 31. The lifting roller assembly 2 is arranged on the front side of the bottom of the device body 31 and between the two feet 32. The lifting roller assembly 2 can rise to leave the ground and can also be lowered to contact the ground. When the lifting roller assembly 2 is off the ground, the feet 32 ​​are in contact with the ground, so that the device body 31 can be fixed on the ground, see for details. Figure 2When the lifting roller assembly 2 contacts the ground, the foot 32 can be separated from the ground. At this time, the mobile device body 31 can prevent the foot 32 from wearing against the ground. Figure 3 .

[0058] Regarding the movable device, it should be noted that although the movable device in this embodiment includes two feet 32, two casters 33 and a lifting roller assembly 2, this arrangement is not a limitation of the present invention. Without departing from the principles of the present invention, those skilled in the art may also adopt other arrangements in other embodiments, for example, adjusting the number and position of the feet 32, the number and position of the casters 33, and the number and position of the lifting roller assemblies 2 according to the weight and volume of the device body 31. Alternatively, the bottom surface of the device body 31 is provided with multiple feet 32 ​​and multiple lifting roller assemblies 2, but no casters 33; when the device body 31 is moved, the device body 31 can be supported by the multiple lifting roller assemblies 2; when the device body 31 is fixed, the device body 31 is supported by the multiple feet 32. These solutions do not deviate from the basic principles of the present invention and therefore fall within the scope of protection of the present invention.

[0059] Reference Figure 4 The lifting roller assembly 2 includes a wheel body 21, a connecting member 23, a connecting shaft 22, a first driving assembly and a second driving assembly.

[0060] The wheel body 21 is rotatably connected to the connecting member 23. The connecting member 23 includes a wheel axle, and a first bearing is provided between the wheel body 21 and the wheel axle so that the wheel body 21 can rotate around the wheel axle. The connecting shaft 22 is provided above the wheel body 21, and the connecting shaft 22 is provided vertically. The connecting shaft 22 is rotatably connected to the connecting member 23. The lower end of the connecting shaft 22 is connected to the connecting member 23 via a second bearing 24 so that the connecting shaft 22 can rotate around the second bearing 24. A thread is provided on the upper portion of the connecting shaft 22. In this embodiment, the thread is a right-hand thread; in other embodiments, it can also be a left-hand thread. A threaded hole is provided on the bottom surface of the device body 31, and the connecting shaft 22 is connected to the threaded hole via a thread. When the connecting shaft 22 rotates upward along the thread, the connecting shaft 22 is connected to the connecting member 23 through the second bearing 24, which will not drive the connecting member 23 to rotate, but will drive the connecting member 23 and the wheel body 21 to rise so that the wheel body 21 is off the ground; when the connecting shaft 22 rotates downward along the thread, it can cause the wheel body 21 to descend so that the wheel body 21 contacts the ground.

[0061] Reference Figure 5A gear 221 is also provided on the connecting shaft 22. Specifically, the gear 221 can be a standard gear 221, or it can be a plurality of protruding teeth evenly distributed on the wheel rim, with grooves formed between the protruding teeth. Both the first drive assembly and the second drive assembly can drive the gear 221 to rotate. Specifically, the first drive assembly is provided on the left side of the gear 221 and can drive the gear 221 to rotate clockwise to lower the wheel body 21; the second drive assembly is provided on the right side of the gear 221 and can drive the gear 221 to rotate counterclockwise to raise the wheel body 21.

[0062] Those skilled in the art will appreciate that, in this embodiment, the thread on the connecting shaft 22 is a right-hand thread. Therefore, the first drive assembly located to the left of the gear 221 can drive the gear 221 to rotate clockwise, thereby lowering the wheel body 21; and the second drive assembly located to the right of the gear 221 can drive the gear 221 to rotate counterclockwise, thereby raising the wheel body 21. In other embodiments, the thread can be a left-hand thread, in which case the first drive assembly can drive the wheel body 21 to rise, while the second drive assembly can drive the wheel body 21 to descend. Such variations clearly do not deviate from the basic principles of the present invention and fall within the scope of protection of the present invention.

[0063] Reference Figures 5 to 7 The first driving assembly includes a left fixing member 1, a left first push rod 41, a left second push rod 42, a left first elastic member 43 and a left second elastic member 44.

[0064] The left-side fixing member 1 is provided with a first through-hole, into which the left-side first push rod 41 is inserted, enabling the left-side first push rod 41 to slide along the first through-hole. The left-side first elastic member 43 is specifically a cylindrical spring. One end of the left-side first elastic member 43 is connected to the left-side fixing member 1, and the other end is connected to the left-side first push rod 41. When the left-side first push rod 41 is pushed to slide along the first through-hole in a first direction, the left-side first elastic member 43 is stretched. The stretched left-side first elastic member 43 can drive the left-side first push rod 41 to slide along the first through-hole in a second direction, thereby resetting the left-side first push rod 41. The first direction is opposite to the second direction.

[0065] A left slot 45 is provided at one end of the left first push rod 41, into which the first end of the left second push rod 42 extends. A left hinge axis 46 is provided in the left slot 45. A through hole is provided at the first end of the left second push rod 42, through which the left hinge axis 46 passes, allowing the left second push rod 42 to rotate about the left hinge axis 46. A left stopper 411 is provided within the left slot 45. Specifically, the left stopper 411 protrudes from the bottom surface of the left slot 45. When the left second push rod 42 rotates, the first end of the left second push rod 42 abuts the left stopper 411, thereby limiting the rotation range of the left second push rod 42. A left protrusion 421 is provided at the second end of the left second push rod 42, which is capable of extending into the groove between the teeth of the gear 221. The left second elastic member 44 is specifically a cylindrical spring. One end of the left second elastic member 44 is connected to the left first push rod 41, and the other end is connected to the left second push rod 42. As the left protrusion 421 of the left second push rod 42 leaves the groove of the gear 221, the protruding teeth of the gear 221 rotate the left second push rod 42, thereby stretching the left second elastic member 44. When the left protrusion 421 of the left second push rod 42 is completely out of the groove, the left second elastic member 44 drives the left second push rod 42 to rotate back to its original position, allowing the left protrusion 421 of the left second push rod 42 to re-enter the groove.

[0066] Continue to refer to Figures 5 to 7 The second driving assembly includes a right fixing member 1, a right first push rod 51, a right second push rod 52, a right first elastic member 53 and a right second elastic member 54.

[0067] The right fixing member 1 is provided with a second through-hole, into which the right first push rod 51 is inserted, enabling the right first push rod 51 to slide along the second through-hole. The right first elastic member 53 is specifically a cylindrical spring. One end of the right first elastic member 53 is connected to the right fixing member 1, and the other end is connected to the right first push rod 51. When the right first push rod 51 is pushed to slide along the first through-hole in the third direction, the right first elastic member 53 is stretched. The stretched right first elastic member 53 can then drive the right first push rod 51 to slide along the first through-hole in the fourth direction, thereby resetting the right first push rod 51.

[0068] One end of the right first push rod 51 is provided with a right slot 55, into which the first end of the right second push rod 52 extends. A right hinge axis 56 is disposed within the right slot 55. A through hole is provided at the first end of the right second push rod 52, through which the right hinge axis 56 passes, allowing the right second push rod 52 to rotate about the right hinge axis 56. A right stopper 511 is disposed within the right slot 55. Specifically, the right stopper 511 protrudes from the bottom surface of the right slot 55. When the right second push rod 52 rotates, the first end of the right second push rod 52 abuts the right stopper 511, thereby limiting the rotation range of the right second push rod 52. A right protrusion 521 is disposed at the second end of the right second push rod 52, which is capable of extending into the groove between the teeth of the gear 221. The right second elastic member 54 is specifically a cylindrical spring. One end of the right second elastic member 54 is connected to the right first push rod 51, and the other end is connected to the right second push rod 52. As the right protrusion 521 of the right second push rod 52 leaves the groove of the gear 221, the protruding teeth of the gear 221 rotate the right second push rod 52, thereby stretching the right second elastic member 54. When the right protrusion 521 of the right second push rod 52 is completely out of the groove, the right second elastic member 54 drives the right second push rod 52 to rotate back to its original position, allowing the right protrusion 521 of the right second push rod 52 to re-enter the groove.

[0069] In this embodiment, the left fixing member 1 and the right fixing member 1 are connected as a whole, which is marked in the figure as fixing member 1. In other embodiments, the left fixing member 1 and the right fixing member 1 can also be configured as two independent components.

[0070] The working principle of the movable device is described below.

[0071] When the device body 31 is fixedly set on the ground, the wheel body 21 of the lifting roller assembly 2 does not contact the ground, and the two base feet 32 ​​and the two casters 33 contact the ground, so that the device body 31 is fixed.

[0072] When the device body 31 needs to be moved, the state of the lifting roller assembly in front of the mobile device body 31 is referred to Figure 8 . Reference Figure 9, pushing the left first push rod 41 causes it to move along the first through hole in the first direction. The left second push rod 42, connected to the left first push rod 41, also moves in the first direction. As the left second push rod 42 moves in the first direction, the left protrusion 421 of the left second push rod 42 abuts the edge of the tooth of the gear 221. In other words, the left protrusion 421 extends into the groove between the teeth on the left side of the gear 221. The first end of the left second push rod 42 abuts the left stop 411, preventing the left second push rod 42 from rotating. The left first push rod 41 is then pushed further in the first direction, causing the left second push rod 42 to rotate the gear 221 clockwise. As the gear 221 rotates, friction occurs between the left second push rod 42 and the gear 221. When the operator feels the friction cease, indicating that the left second push rod 42 can no longer rotate the gear 221, the left first push rod 41 is released. After release, the stretched left first elastic member 43 drives the left first push rod 41 and the left second push rod 42 to move in the second direction. During the movement of the left second push rod 42 in the second direction, the protruding teeth of the gear 221 block the left protrusion 421 of the left second push rod 42, causing the left second push rod 42 to rotate counterclockwise around the left hinge shaft 46. During the counterclockwise rotation, the left second elastic member 44 is stretched. Figure 10 After that, the left second push rod 42 continues to move in the second direction, so that the left protrusion 421 of the left second push rod 42 is disengaged from the groove of the gear 221, and the stretched left second elastic member 44 causes the left second push rod 42 to rotate clockwise and reset. The reset state is detailed in FIG. Figure 8 .

[0073] By repeatedly pushing and releasing the left first push rod 41, the gear 221 continues to rotate clockwise. The connecting shaft 22 rotates clockwise with the gear 221, causing the connecting shaft 22 to extend downward along the threaded portion, thereby moving the connector 23 and the wheel body 21 downward. Once the wheel body 21 contacts the ground, the first push rod 41 can be further pushed and released, causing the front side of the wheel body 21 supporting the device body 31 to lift upward, separating the foot 32 from the ground. At this point, the device body 31 is supported by the wheel body 21 and two casters 33 of the lifting roller assembly 2, while the two foot 32 are not in contact with the ground. Moving the device body 31 in this state does not wear out the foot 32.

[0074] After the device body 31 has completed its movement, the right first push rod 51 is pushed, causing it to move along the second through hole in the third direction. The right second push rod 52, connected to the right first push rod 51, also moves in the third direction. As the right second push rod 52 moves in the third direction, the right protrusion 521 of the right second push rod 52 abuts the edge of the tooth of the gear 221. In other words, the right protrusion 521 extends into the groove between the teeth on the right side of the gear 221. The first end of the right second push rod 52 also abuts the right stop 511, preventing the right second push rod 52 from rotating. The right first push rod 51 is then pushed further in the first direction, causing it to rotate the gear 221 counterclockwise. As the gear 221 rotates, friction occurs between the right second push rod 52 and the gear 221. When the operator feels the friction cease, indicating that the right second push rod 52 can no longer rotate the gear 221, the right first push rod 51 is released. After release, the stretched right first elastic member 53 forces the right first push rod 51 and the right second push rod 52 to move in the fourth direction. As the right second push rod 52 moves in the fourth direction, the protruding teeth of the gear 221 block the right protrusion 521 of the right second push rod 52, causing the right second push rod 52 to rotate clockwise about the right hinge axis 56. This clockwise rotation stretches the right second elastic member 54. The right second push rod 52 then continues to move in the fourth direction, disengaging the right protrusion 521 of the right second push rod 52 from the groove of the gear 221. The stretched right second elastic member 54 causes the right second push rod 52 to rotate counterclockwise and return to its original position.

[0075] By repeatedly pushing and releasing the right first push rod 51, the gear 221 rotates continuously counterclockwise. The connecting shaft 22 rotates counterclockwise with the gear 221, moving the connecting shaft 22 upward along the thread, causing the connector 23 and the wheel 21 to move upward. Once the wheel 21 is separated from the ground, the device body 31 is supported by the two feet 32 ​​and two casters 33, securing the device body 31.

[0076] Thus far, the technical solutions of the present invention have been described in conjunction with the preferred embodiments shown in the accompanying drawings. However, it will be readily understood by those skilled in the art that the scope of protection of the present invention is obviously not limited to these specific embodiments. Without departing from the principles of the present invention, those skilled in the art may make equivalent changes or substitutions to the relevant technical features, and the technical solutions after such changes or substitutions will fall within the scope of protection of the present invention.

Claims

1. A drive assembly for driving a gear to rotate, characterized in that: include: A fixing member (1), a first push rod and a second push rod; The first push rod is slidably connected to the fixing member (1), and the first end of the second push rod is rotatably connected to the first push rod; When the first push rod slides in the first direction, the second end of the second push rod can extend into the inter-tooth groove of the gear (221), so that the second end of the second push rod can push the gear (221) to rotate.

2. The drive assembly according to claim 1, wherein: A limiting portion is provided on the first push rod; When the second end of the second push rod extends into the inter-tooth groove of the gear (221), the limiting portion can abut against the first end of the second push rod, so that the second push rod can push the gear (221) to rotate.

3. The drive assembly according to claim 1, wherein: The drive assembly further includes: a first elastic member, one end of which is connected to the first push rod, and the other end of which is connected to the second push rod; When the first push rod slides in the second direction, the second push rod can be withdrawn from the inter-tooth groove, and the first elastic member can reset the second push rod that has withdrawn from the inter-tooth groove; The first direction is opposite to the second direction.

4. The drive assembly according to claim 1, wherein: The drive assembly further includes: a second elastic member, one end of which is connected to the fixing member (1) and the other end of which is connected to the first push rod; When the first push rod slides in the first direction, the second elastic member can drive the first push rod to slide in the second direction.

5. A lifting roller assembly, characterized in that: include: Wheel body (21); A connecting shaft (22) connected to the wheel body (21), wherein the connecting shaft (22) is provided with a thread and a gear (221); The first drive assembly is a drive assembly that drives the gear (221) to rotate as described in any one of claims 1 to 4, and the first drive assembly can drive the gear (221) to rotate in a third direction so that the wheel body (21) moves along the axial direction of the thread.

6. The roller assembly according to claim 5, characterized in that The roller assembly further comprises: A connecting member (23), the wheel body (21) is rotatably connected to the connecting member (23), and the connecting shaft (22) is rotatably connected to the connecting member (23); When the connecting shaft (22) moves along the thread, the wheel body (21) can move along the axial direction of the thread.

7. The roller assembly according to claim 5, characterized in that The roller assembly further comprises: The second drive assembly is a drive assembly for driving the gear (221) to rotate as described in any one of claims 1 to 4, and the second drive assembly can drive the gear (221) to rotate in a fourth direction, and the third direction is opposite to the fourth direction.

8. A movable device, characterized in that: It comprises a lifting roller assembly (2) as described in any one of claims 5 to 7.

9. The movable device according to claim 8, wherein: The movable device further comprises a device body (31); The connecting shaft (22) is connected to the device body (31) via the thread.

10. The movable device according to claim 8, wherein: The movable device further comprises: The device body (31) is provided with two feet (32) on the front side of the bottom, and two casters (33) on the rear side of the bottom, and the roller assembly is provided between the two feet (32).

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