Sweeper and assembly method thereof

Abstract

The invention belongs to the technical field of smart home, and particularly discloses a sweeper and a sweeper assembly method.The sweeper comprises a chassis, a rotating shaft, a universal wheel assembly and a lifting driving assembly, and a shaft hole is formed in the chassis in a penetrating mode; the rotating shaft penetrates through the shaft hole, can rotate in the shaft hole and reciprocates along the shaft hole; the universal wheel assembly is fixed on the rotating shaft and synchronously moves along with the rotating shaft; the lifting driving assembly is configured to apply pressure to the rotating shaft so that the universal wheel assembly connected to the rotating shaft can move relatively away from the chassis. The sweeper can be automatically lifted when encountering an obstacle, and the difficulty that the sweeper crosses the obstacle is reduced.

Description

Technical Field

[0001] The present invention relates to the field of smart home technology, and in particular to a sweeping machine and a sweeping machine assembly method. Background Art

[0002] In today's fast-paced life, sweeping machines have become the choice of many families. They can automatically clean the floor and reduce our housework burden. However, when sweeping the floor, the existing sweeping machines will affect the climbing efficiency due to the high steps on the ground, which will reduce the cleaning efficiency and affect the user experience. Summary of the invention

[0003] The object of the present invention is to provide a sweeping machine to solve the problem of slow climbing efficiency of the sweeping machine when climbing stairs.

[0004] To achieve this object, the present invention adopts the following technical solutions:

[0005] In the first aspect, the present invention provides a sweeping machine, comprising a chassis, a rotating shaft, a universal wheel assembly and a lifting drive assembly, wherein the chassis is provided with an axial hole extending through it in the height direction; the rotating shaft comprises a rotating shaft body and a fixed screw, the rotating shaft body passes through the axial hole, and the fixed screw is coaxially inserted in the rotating shaft body and threadedly connected to the rotating shaft body; the universal wheel assembly is fixed to one end of the rotating shaft body away from the fixed screw, and moves synchronously with the rotating shaft; the lifting drive assembly is configured to apply pressure to the rotating shaft so that the universal wheel assembly connected to the rotating shaft moves relatively away from the chassis.

[0006] Optionally, the lifting drive assembly includes a driving motor and a rocker arm, the driving motor is fixed on the chassis, and the rocker arm is connected to the driving motor so as to abut against the rotating shaft and apply pressure to the rotating shaft under the drive of the driving motor.

[0007] Optionally, the lifting drive assembly includes a driving motor and a cam, the driving motor is fixed on the chassis, and the cam is connected to the output end of the driving motor through a camshaft to apply pressure to the rotating shaft under the drive of the driving motor.

[0008] Optionally, the lifting drive assembly also includes a limit bracket, which is configured in a Z shape, one end of the limit bracket is connected to the rotating shaft, and the other end of the limit bracket is located on the side of the cam facing the chassis, and the cam abuts against the limit bracket.

[0009] Optionally, the lifting drive assembly further includes a first limit member, which is fixed on the chassis and abuts against the camshaft of the cam.

[0010] Optionally, the lifting drive assembly further includes a guide rod arranged parallel to the rotating shaft, wherein the guide rod is fixed on the first limiting member and passes through the limiting bracket to be movably connected to the limiting bracket.

[0011] Optionally, the first end of the guide rod is fixedly inserted on the chassis, the second end of the guide rod is provided with a clamping groove, and the guide rod is fixed to the first limiting member by a clamping ring matched with the clamping groove.

[0012] Optionally, the lifting drive assembly also includes a second limit member mounted on the camshaft of the cam, and the wall of the through hole of the second limit member for the camshaft to pass through is provided with a limit groove extending in the circumferential direction of the second limit member, and the camshaft is provided with a stop block, and the stop block is rotatably set in the limit groove.

[0013] Optionally, the sweeping machine further comprises a second elastic member, which is connected to the rotating shaft and provides elastic force to the universal wheel assembly connected to the rotating shaft to approach the chassis.

[0014] In a second aspect, the present invention provides a sweeping machine assembly method for assembling the sweeping machine, characterized in that it comprises the following steps:

[0015] The rotating shaft body is assembled on the universal wheel assembly in advance or is formed integrally with the universal wheel assembly;

[0016] Pass the rotating shaft body through the shaft hole;

[0017] Screw the fixing screw into the rotating shaft body so that the rotating shaft body is confined in the shaft hole;

[0018] Install the lift drive assembly on the chassis.

[0019] Beneficial effects of the present invention: When the sweeping machine proposed by the present invention climbs obstacles such as steps, the lifting drive assembly can drive the rotating shaft to drive the universal wheel assembly to move away from the chassis, even if the chassis is raised relative to the universal wheel assembly, thereby easily crossing obstacles such as steps. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 is a schematic diagram of a partial three-dimensional structure of a sweeping machine according to an embodiment of the present invention;

[0021] Figure 2 It is a partial front view of the sweeping machine in the first embodiment of the present invention;

[0022] Figure 3 is along Figure 2 Sectional view along AA direction;

[0023] Figure 4 yes Figure 3Schematic diagram of the enlarged structure at M in the middle;

[0024] Figure 5 is a partial top view of the sweeping machine in the second embodiment of the present invention;

[0025] Figure 6 is along Figure 5 Cross-sectional view along the BB direction;

[0026] Figure 7 yes Figure 6 Schematic diagram of the enlarged structure at N in the middle;

[0027] Figure 8 yes Figure 5 Sectional view along CC direction;

[0028] Fig. 9 yes Figure 8 Schematic diagram of the enlarged structure at N in the middle;

[0029] Fig.10 is a schematic structural diagram of a lifting drive assembly in an embodiment of the present invention;

[0030] Fig.11 It is an assembly diagram of the cam and the second limiting member in an embodiment of the present invention.

[0031] In the figure:

[0032] 1. Chassis; 11. Axle hole; 12. Fixed sleeve;

[0033] 2. Rotating shaft; 21. Rotating shaft body; 211. Large diameter section; 212. Small diameter section; 22. Fixing screw; 23. Gasket;

[0034] 3. Universal wheel assembly; 31. Universal wheel; 32. Mounting seat;

[0035] 4. lifting drive assembly; 41. driving motor; 42. swing rod; 43. cam; 431. camshaft; 432. stopper; 44. first limiting member; 441. main body; 442. limiting member; 45. second limiting member; 411. limiting groove; 46. first monitoring member; 47. first elastic member; 48. limiting bracket; 49. guide rod; 491. slot;

[0036] 5. Second monitoring component;

[0037] 6. A second elastic member;

[0038] 7. Control circuit board. DETAILED DESCRIPTION

[0039] The present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It is to be understood that the specific embodiments described herein are only used to explain the present invention, rather than to limit the present invention. It should also be noted that, for ease of description, only parts related to the present invention, rather than all structures, are shown in the accompanying drawings.

[0040] In the description of the present invention, unless otherwise clearly specified and limited, the terms "connected", "connected", and "fixed" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0041] In the present invention, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may include that the first and second features are in direct contact, or may include that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, a first feature being "above", "above" and "above" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being "below", "below" and "below" a second feature includes that the first feature is directly below and obliquely below the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0042] In the description of this embodiment, the terms "upper", "lower", "right", etc., directions or positional relationships are based on the directions or positional relationships shown in the drawings, and are only for the convenience of description and simplification of operation, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as limiting the present invention. In addition, the terms "first" and "second" are only used to distinguish in the description and have no special meaning.

[0043] Embodiment 1

[0044] refer to Figure 1-Figure 5As shown, an embodiment of the present invention provides a sweeping machine, comprising a chassis 1, a rotating shaft 2, a universal wheel assembly 3 and a lifting drive assembly 4, wherein an axial hole 11 for the rotating shaft 2 to pass through is opened on the chassis 1 along the height direction, the rotating shaft 2 is rotatably arranged in the axial hole 11 and can reciprocate in the axial direction of the axial hole 11, the universal wheel assembly 3 comprises a universal wheel 31 and a mounting seat 32, the universal wheel 31 is rotatably arranged on the mounting seat 32, the mounting seat 32 is fixed to the rotating shaft 2 and moves synchronously with the rotating shaft 2, the lifting drive assembly 4 is arranged on the chassis 1, and the lifting drive assembly 4 is configured to apply pressure to the rotating shaft 2 so that the universal wheel assembly 3 connected to the rotating shaft 2 moves relatively away from the chassis 1.

[0045] When the above-mentioned sweeping machine climbs obstacles such as steps, it can drive the rotating shaft 2 through the lifting drive assembly 4 to drive the universal wheel assembly 3 to move away from the chassis 1, even if the chassis 1 is raised relative to the universal wheel assembly 3, so as to easily cross obstacles such as steps; and after the sweeping machine successfully crosses the obstacle, the chassis 1 falls again under the action of its own gravity and returns to its initial position.

[0046] refer to Figure 4 As shown, the rotating shaft 2 includes a rotating shaft body 21 and a fixing screw 22, wherein the rotating shaft body 21 passes through the shaft hole 11 and is connected to the universal wheel assembly 3, and the fixing screw 22 is coaxially inserted into the rotating shaft body 21 and threadedly connected to the rotating shaft body 21. Such a setting can prevent the rotating shaft 2 from being separated from the shaft hole 11.

[0047] Specifically, the rotating shaft 2 further includes a gasket 23, which is sleeved on the rotating shaft body 21 and abuts against the end surface of the shaft hole 11 away from the universal wheel assembly 3. More specifically, in order to prevent the gasket 23 from being separated from the rotating shaft body 21 from the lower end of the rotating shaft body 21 when assembled on the rotating shaft body 21, the rotating shaft body 21 includes a large diameter section 211 and a small diameter section 212, and the end of the large diameter section 211 away from the small diameter section 212 is connected to the universal wheel assembly 3, and the gasket 23 is sleeved on one end of the small diameter section 212 of the rotating shaft body 21, so as to limit the gasket 23 by using the first limiting step formed between the large diameter section 211 and the small diameter section 212. The provision of the gasket 23 can prevent the nut of the fixing screw 22 from colliding with the end surface of the shaft hole 11, thereby extending the service life of the chassis 1.

[0048] refer to Figure 4 As shown, the lifting drive assembly 4 includes a driving motor 41 and a rocker arm 42. The driving motor 41 is fixed to the side of the chassis 1 facing away from the universal wheel assembly 3 through a motor fixing seat. The first end of the rocker arm 42 is connected to the output shaft of the driving motor 41. The rocker arm 42 can rotate under the drive of the driving motor 41 to abut against the end of the rotating shaft 2 away from the universal wheel assembly 3 and apply pressure to the rotating shaft 2. At the same time, the rocker arm 42 can also be separated from the rotating shaft 2 under the drive of the driving motor 41, so that the chassis 1 can return to its initial position under the action of its own gravity.

[0049] In order to prevent the swing arm 42 from over-rotating when it is separated from the rotating shaft 2, the sweeper further includes a first monitoring component 46 in communication with the drive motor 41. The first monitoring component 46 is fixed on the chassis 1 and is located on the moving path of the end of the swing arm 42 away from the drive motor 41. When the end of the swing arm 42 away from the drive motor 41 rotates in a direction away from the rotating shaft 2 to the monitoring range of the first monitoring component 46 under the action of the drive motor 41, the first monitoring component 46 can generate a monitoring signal, thereby stopping the rotation of the drive motor 41.

[0050] Exemplarily, the first monitoring component 46 is a contact sensor.

[0051] It can be understood that the sweeping machine also includes a walking component and a control circuit board 7. The control circuit board 7 is electrically connected to the walking component and the lifting drive component 4. When encountering steps or obstacles, due to the difficulty in overcoming the obstacles, the walking drive component in the walking component used to provide walking power will inevitably generate a large current instantaneously. After receiving the signal to generate a large current, the control circuit board 7 controls the lifting drive component 4 to apply force to the rotating shaft 2, thereby lifting the chassis 1 and then crossing the obstacle.

[0052] Alternatively, the sweeping machine also includes a second monitoring component 5, which is used to monitor whether there are obstacles such as steps in front of the sweeping machine. When the second monitoring component 5 detects the presence of obstacles such as steps in front, the lifting drive component receives a signal to drive the cam 43 or the rocker arm 42 to swing, so as to provide pressure to the rotating shaft 2, thereby lifting the chassis 1, and then easily crossing the obstacle without generating a feedback signal when contacting the obstacle, thereby improving the service life of the travel drive component.

[0053] Specifically, the second monitoring component 5 can be a laser sensor or an image collector. It is understandable that the height of the obstacle identified by the second monitoring component 5 is higher than the distance between the chassis 1 and the ground when the chassis 1 is in the initial position. For example, when the distance between the chassis 1 and the ground is 15 mm when the chassis 1 is in the initial position, the height of the obstacle detected by the second monitoring component 5 is greater than or equal to 15 mm.

[0054] refer to Figure 4 and Figure 7 As shown, in order to provide a buffer to the universal wheel assembly 3 when the universal wheel assembly 3 contacts an obstacle such as a step, and avoid impact on the drive motor 41, the sweeper further includes a second elastic member 6, which is connected to the rotating shaft 2 and can provide an elastic force to the universal wheel assembly 3 connected to the rotating shaft 2 to move closer to the chassis 1. Obviously, the provision of the second elastic member 6 is also conducive to the reset of the universal wheel assembly 3 relative to the chassis 1. Specifically, the second elastic member 6 is a compression spring, which is sleeved on the rotating shaft 2.

[0055] Embodiment 2

[0056] refer to Figure 5-Figure 11 As shown, different from the first embodiment, the lifting drive assembly 4 includes a driving motor 41 and a cam 43. The driving motor 41 is fixed to the side of the chassis 1 facing away from the universal wheel 31. The cam 43 is connected to the output shaft of the driving motor 41 through the camshaft 431 and can push the rotating shaft 2 to move the universal wheel assembly 3 connected to the rotating shaft 2 away from the chassis 1.

[0057] Specifically, in order to rationally utilize the space on the chassis 1 and lower the height of the sweeper, the sweeper also includes a limit bracket 48, which is configured to be Z-shaped, and its first end is connected to the rotating shaft 2, and the second end of the limit bracket 48 is located on the side of the cam 43 facing the chassis 1, and the cam 43 abuts against the limit bracket 48 to push the rotating shaft 2 to move by squeezing the limit bracket 48.

[0058] More specifically, in order to axially limit the limit bracket 48 and prevent the limit bracket 48 from making axial movement relative to the rotating shaft 2, a second limit step is provided on the side of the rotating shaft body 21 away from the universal wheel assembly 3 to cooperate with the nut of the fixing screw to form a limit space, and the first end of the limit bracket 48 is sleeved on the rotating shaft 2 and is located in the limit space.

[0059] refer to Figure 7-10 As shown, in this embodiment, the lifting drive assembly 4 also includes a first limit member 44, which is fixed on the chassis 1 and located above the cam 43. The first limit member 44 abuts against the cam shaft 431 of the cam 43 to avoid the eccentricity problem caused by the long-term rotation of the cam 43.

[0060] Specifically, the first stopper 44 includes a main body 441 and a stopper 442, wherein the main body 441 is a plate-shaped structure, and the main body 441 is fixedly connected to the chassis 1 or other structures on the chassis 1 by means including but not limited to bolt connection, and the stopper 442 is arranged on the side of the main body 441 facing the cam 43 and abuts against the camshaft 431. More specifically, in order to increase the contact area between the stopper 442 and the camshaft 431, an arc-shaped stopper groove having the same radius as the camshaft 431 is arranged at one end of the stopper 442 abutting against the camshaft 431, and the cam 43 is located in the arc-shaped stopper groove and abuts against the groove wall of the arc-shaped stopper groove.

[0061] Continue to refer Figure 9-10As shown, the lifting drive assembly 4 also includes a guide rod 49 arranged parallel to the rotating shaft 2, the first end of the guide rod 49 is fixed on the chassis 1, and the second end is fixedly connected to the first stopper 44, and the stopper bracket 48 is sleeved on the guide rod 49 and slidably connected to the guide rod 49. Exemplarily, two guide rods 49 are provided, and a fixing sleeve 12 for the guide rod 49 to be inserted is provided on the chassis 1, and the first end of the guide rod 49 is inserted into the fixing sleeve 12 to achieve a fixed connection with the chassis 1, and in order to achieve a fixed connection between the second end of the guide rod 49 and the first stopper 44, a mounting hole for the guide rod 49 to pass through is opened on the first stopper 44, and a snap ring is provided in the mounting hole, and a plurality of snap-in protrusions are arranged at intervals on the inner circumference of the snap ring, and an annular snap groove 491 is provided on the guide rod 49, and the snap-in protrusion can be snapped into the snap groove 491 to achieve a fixed connection between the guide rod 49 and the first stopper 44. More specifically, the first end surface of the guide rod 49 is configured as a tapered surface to reduce the difficulty of sleeve-mounting the clamping ring on the guide rod 49 .

[0062] The lifting drive assembly 4 further includes a first elastic member 47, which is configured to provide a reset force to the limit bracket 48. Exemplarily, the first elastic member 47 also adopts a compression spring, and two compression springs are respectively sleeved on two guide rods 49 and located on the side of the limit bracket 48 facing the chassis 1.

[0063] Based on the setting of the cam 43, in this embodiment, the second limit member 45 is used to limit the rotation angle of the cam 43. The second limit member 45 is fixed on the driving motor 41 and is sleeved on the camshaft 431 of the cam 43. The hole wall of the through hole for the camshaft 431 to pass through is provided with a limit groove 411 extending along the circumferential direction of the second limit member 45. Correspondingly, the camshaft 431 of the cam 43 is radially provided with a stop block 432, and the stop block 432 is rotatably set in the limit groove 411. When the stop block 432 contacts one end of the limit groove 411, the cam 43 is limited to continue to rotate in the original direction.

[0064] Embodiment 3

[0065] This embodiment provides a method for assembling a sweeping machine, which is used to assemble the sweeping machine in Embodiment 1. The method comprises the following steps:

[0066] S1, assembling the shaft body 21 on the universal wheel assembly 3 in advance or forming it as one piece with the universal wheel assembly 3;

[0067] S2, passing the shaft body 21 through the shaft hole 11, and sleeve the gasket 23 on the shaft body 21;

[0068] S3, sleeve the compression spring on the rotating shaft body 21;

[0069] S4, screw the fixing screw 22 into the shaft body 21, so that the shaft body 21 is limited in the shaft hole 11;

[0070] S4, fixing the driving motor 41 on the chassis 1 and connecting the swing rod 42;

[0071] S5. Install the control circuit board and the travel assembly on the chassis 1.

[0072] Embodiment 4

[0073] This embodiment provides a method for assembling a sweeping machine, which is used to assemble the sweeping machine in the second embodiment. The method comprises the following steps:

[0074] S1, assembling the shaft body 21 on the universal wheel assembly 3 in advance or forming it as one piece with the universal wheel assembly 3;

[0075] S2, inserting the guide rod 49 into the fixed sleeve 12, and sleeve the compression spring as the first elastic member 47 on the guide rod 49;

[0076] S3, pass the rotating shaft body 21 through the shaft hole 11, and sequentially sleeve the compression spring as the second elastic member 6 and the limit bracket 48 on the rotating shaft body 21, and sleeve the limit bracket 48 on the guide rod 49, and fix the guide rod 49 on the first limit member 44 by using a snap ring;

[0077] S4, screw the fixing screw 22 into the shaft body 21, so that the shaft body 21 is limited in the shaft hole 11;

[0078] S4, fixing the driving motor 41 on the chassis 1, fixing the second stopper 45 on the stator of the driving motor 41, and connecting the camshaft of the cam to the rotor of the driving motor through the second stopper 45;

[0079] S5. Install the control circuit board and the travel assembly on the chassis 1.

[0080] Obviously, the above embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the embodiments of the present invention. For those skilled in the art, various obvious changes, readjustments and substitutions can be made without departing from the protection scope of the present invention. It is not necessary and impossible to list all the embodiments here. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the claims of the present invention.

Claims

1. A sweeping machine, characterized in that: The sweeping machine comprises: A chassis (1), wherein the chassis (1) is provided with an axial hole (11) extending through the chassis (1) in a height direction; A rotating shaft (2), the rotating shaft (2) comprising a rotating shaft body (21) and a fixing screw (22), the rotating shaft body (21) passing through the shaft hole (11), the fixing screw (22) being coaxially inserted into the rotating shaft body (21) and being threadedly connected to the rotating shaft body (21); A universal wheel assembly (3) is fixed to one end of the rotating shaft body (21) away from the fixing screw rod (22) and moves synchronously with the rotating shaft (2); A lifting drive assembly (4) is configured to apply pressure to the rotating shaft (2) so as to cause the universal wheel assembly (3) connected to the rotating shaft (2) to move relatively away from the chassis (1).

2. The sweeping machine according to claim 1, characterized in that: The lifting drive assembly (4) comprises a driving motor (41) and a rocker arm (42); the driving motor (41) is fixed on the chassis (1); and the rocker arm (42) is connected to the driving motor (41) so as to abut against the rotating shaft (2) and apply pressure to the rotating shaft (2) under the drive of the driving motor (41).

3. The sweeping machine according to claim 1, characterized in that: The lifting drive assembly (4) comprises a driving motor (41) and a cam (43); the driving motor (41) is fixed on the chassis (1); the cam (43) is connected to the output end of the driving motor (41) via a camshaft (431) so as to apply pressure to the rotating shaft (2) under the drive of the driving motor (41).

4. The sweeping machine according to claim 3, characterized in that: The lifting drive assembly (4) further comprises a limit bracket (48), wherein the limit bracket (48) is arranged in a Z shape, one end of the limit bracket (48) is connected to the rotating shaft (2), and the other end of the limit bracket (48) is located on the side of the cam (43) facing the chassis (1), and the cam (43) abuts against the limit bracket (48).

5. The sweeping machine according to claim 4, characterized in that: The lifting drive assembly (4) further comprises a first position-limiting member (44), wherein the first position-limiting member (44) is fixed on the chassis (1) and abuts against the cam shaft (431) of the cam (43).

6. The sweeping machine according to claim 5, characterized in that: The lifting drive assembly (4) further comprises a guide rod (49) arranged parallel to the rotating shaft (2); the guide rod (49) is fixed on the first limiting member (44); the guide rod (49) passes through the limiting bracket (48); and the limiting bracket (48) is movably arranged on the guide rod (49).

7. The sweeping machine according to claim 6, characterized in that: The first end of the guide rod (49) is fixedly inserted on the chassis (1), the second end of the guide rod (49) is provided with a clamping groove (491), and the guide rod (49) is fixed to the first limiting member (44) via a clamping ring that cooperates with the clamping groove (491).

8. The sweeping machine according to claim 3, characterized in that: The lifting drive assembly (4) further comprises a second limiting member (45) sleeved on the cam shaft (431) of the cam (43); a limiting groove (411) extending in the circumferential direction of the second limiting member (45) is arranged on the wall of a through hole of the second limiting member (45) through which the cam shaft (431) passes; a stopping block (432) is arranged on the cam shaft (431); and the stopping block (432) is rotatably arranged in the limiting groove (411).

9. The sweeping machine according to any one of claims 1 to 8, characterized in that: The sweeping machine further comprises a second elastic member (6), wherein the second elastic member (6) is connected to the rotating shaft (2) and provides an elastic force to the universal wheel assembly (3) connected to the rotating shaft (2) to approach the chassis (1).

10. A method for assembling a sweeping machine, characterized in that: Used to assemble the sweeping machine according to any one of claims 1 to 9, characterized in that it comprises the following steps: The rotating shaft body (21) is assembled on the universal wheel assembly (3) in advance or is integrally formed with the universal wheel assembly (3); Pass the rotating shaft body (21) through the shaft hole (11); Screwing a fixing screw (22) into the rotating shaft body (21) so that the rotating shaft body (21) is confined within the shaft hole (11); Install the lifting drive assembly (4) on the chassis (1).

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