CN217540263U - Lifting device - Google Patents

Abstract

The embodiment of the application provides a lifting device, includes: the lifting sleeve rod unit comprises N sections of sleeve rods arranged along the lifting direction, the N sections of sleeve rods are sequentially sleeved from outside to inside or from inside to outside, and adjacent sleeve rods can relatively move along the lifting direction; the elastic jacking unit comprises at least one elastic piece, and the at least one elastic piece is arranged between the ith link rod and the (i-1) th link rod along the lifting direction so as to provide elastic force for the (i-1) th link rod to lift relative to the ith link rod in the lifting direction; a rope retraction mechanism; and one end of the rope is connected with the loop bar at the top end, and the other end of the rope penetrates through the lifting loop bar unit along the lifting direction and is connected with the rope retracting mechanism in a retractable manner. The lifting device adopts the cooperation of the nested loop bars, the elastic parts and the ropes to realize lifting, determines the length of the loop bars according to the height of a placing space, increases and decreases the number of the loop bars according to the required lifting stroke, can realize executing a larger lifting stroke in a limited installation space, and has small integral volume and compact structure.

Description

Lifting device

Technical Field

The application relates to the technical field of push rods, in particular to a lifting device.

Background

Along with the development of automation technology, artificial intelligence and automation begin to obtain the wide application, just need often to use automatic device that promotes among them to promote cloud platform camera, function arm etc.. In most use scenes, a lifting device which is small in size when retracted and large in stroke after pushing and lifting is needed to meet the use requirements of narrow spaces, and if the cloud platform camera of the small robot meets the shooting requirements, the cloud platform camera needs to be lifted to the height position of the robot which is several times of the height of the robot to shoot and the like.

The mechanical pushing and lifting mechanisms in the market at present have a rack gear type and a hinge type, and one of the two types has the defect that a large retraction volume is needed to meet the requirement of a large pushing stroke.

In order to really realize that the equipment can be placed in a narrow space after being retracted and meet the pushing and lifting requirements of a large stroke, a lifting mechanism with small volume and a large stroke needs to be designed.

Disclosure of Invention

For solving the technical problem that exists now, this application provides a small in size, compact structure's elevating gear.

In order to achieve the above purpose, the technical solution of the embodiment of the present application is implemented as follows:

the embodiment of the application provides a lifting device, includes:

the lifting loop bar unit comprises N loop bars arranged along a lifting direction, the N loop bars are sequentially sleeved around the lifting direction from outside to inside or from inside to outside, adjacent loop bars can relatively move along the lifting direction, N is an integer and is more than or equal to 2;

the elastic jacking unit comprises at least one elastic piece, the elastic piece is arranged between the ith link rod and the (i-1) th link rod along the lifting direction so as to provide elastic force for the (i-1) th link rod to lift relative to the ith link rod in the lifting direction, i is an integer and is more than or equal to 2 and less than or equal to N;

a rope retraction mechanism; and

one end of the rope is connected with the loop bar at the top end, and the other end of the rope penetrates through the lifting loop bar unit along the lifting direction and is connected with the rope retracting mechanism in a retractable manner;

a shaft shoulder is arranged on the outer wall of the i-1 th sleeve rod, and an embedded section is formed between the shaft shoulder and the lower end face of the i-1 th sleeve rod; the elastic piece is arranged in the ith sleeve rod section, sleeved on the embedding section of the (i-1) th sleeve rod section, and one end of the elastic piece is abutted against the shaft shoulder.

In one embodiment, the bottom end of the i-1 st section of the loop bar extends inwards to form an inner edge, and the other end of the elastic piece abuts against the inner edge.

In one embodiment, the nth sleeve rod is provided with a flange for fixing the lifting sleeve rod unit, and the flange extends outwards from the lower end of the nth sleeve rod.

In one embodiment, a guide groove parallel to the lifting direction is formed in the inner wall of the i-th loop bar, a positioning key protrudes out of the outer wall of the i-1-th loop bar, and the positioning key is placed in the guide groove to limit the movement of the i-1-th loop bar relative to the i-th loop bar to the movement along the lifting direction;

and a distance is reserved between the upper end of the guide groove and the upper end surface of the ith sleeve rod, and the lower end surface of the guide groove is communicated with the upper end surface of the ith sleeve rod to form an opening.

In one embodiment, a positioning key protrudes from the inner wall of the ith link rod, and a guide groove parallel to the lifting direction is formed in the outer wall of the (i-1) th link rod so as to limit the movement of the (i-1) th link rod relative to the ith link rod to the movement along the lifting direction;

the upper end of the guide groove is communicated with the upper end face of the i-1 section of the loop bar to form an opening, and a distance is reserved between the lower end of the guide groove and the lower end face of the i-1 section of the loop bar.

In one embodiment, the heights of the at least two sections of loop bars in the lifting direction are substantially equal.

In one embodiment, the elastic member is a compression spring and the rope is a steel wire rope.

In one embodiment, the rope retracting mechanism comprises a rope winding wheel and a servo motor, the other end of the rope is connected to the rope winding wheel, and a power output shaft of the servo motor is connected to the rope winding wheel.

In one embodiment, the rope retraction mechanism is arranged at the bottom of the lifting loop bar unit along the lifting direction, and the other end of the rope is directly connected to the rope winding wheel along the lifting direction; or the rope retracting mechanism is arranged on one side of the lifting loop bar unit, and the other end of the rope is connected to the rope winding wheel after passing around the fixed pulley.

In one embodiment, the lifting device further comprises a support, and the nth loop bar, the rope winding wheel and the servo motor are fixed on the support.

The lifting device at least has the following beneficial effects: the lifting device adopts the matching of a plurality of sections of nested loop bars, elastic parts and ropes to realize lifting, the height of a lifting loop bar unit in the lifting direction is determined by the length of the ropes released by a rope retraction mechanism in the lifting direction, the lifting device only needs to determine the length of each section of loop bar according to the height of a placement space, and the number of the loop bar sections is properly increased or decreased according to the required lifting stroke, so that the larger lifting stroke can be executed in the limited installation space, the elastic parts can be contracted and accommodated in the embedded sections on the loop bars, the height in the lifting direction is not occupied, and the lifting device is small in overall size and compact in structure; each part of the lifting device is simple in structure, convenient to machine and low in cost, and is suitable for occasions with various requirements, low cost and high performance.

Drawings

Fig. 1 is a perspective view of a lifting device according to an embodiment of the present application;

FIG. 2 is an exploded perspective view of the lifting device of FIG. 1;

fig. 3 is an exploded perspective view of the lifting device in fig. 1;

FIG. 4 is an enlarged perspective view of the lifting device of FIG. 1 taken along a plane passing through the lifting direction;

FIG. 5 is an enlarged view of portion I of FIG. 4;

FIG. 6 is an enlarged view of section II of FIG. 4;

FIG. 7 is a front view of the elevator assembly of FIG. 4 in a fully raised condition;

figure 8 is a front view of the lift of figure 4 in a fully retracted state.

The elements in the figures are numbered as follows:

the lifting loop bar unit 10 (wherein, the loop bar 11, the end cover 12, the shaft shoulder 111, the inner edge 112, the positioning key 113, the guide groove 114, the embedding section 115, the rope threading hole 121);

an elastic jacking unit 20 (wherein, an elastic piece 21);

a rope retracting mechanism 30 (in which a rope winding wheel 31 and a servo motor 32);

a cord 40 (wherein first end 41, second end 42);

a support 50.

Detailed Description

The technical solution of the present application is further described in detail with reference to the drawings and specific embodiments.

Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used in the description of the present application herein is for the purpose of describing particular embodiments only and is not intended to be limiting of implementations of the present application. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.

In the description of the present application, it is to be understood that the terms "center", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like indicate orientations or positional relationships based on those shown in the drawings, merely for convenience of description and simplicity of description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed in a particular orientation, and be operated, and thus, are not to be construed as limiting the present application. In the description of the present application, "a plurality" means two or more unless otherwise specified.

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

Referring to fig. 1 and 2, a lifting apparatus according to an embodiment of the present invention includes a lifting rod unit 10, an elastic jacking unit 20, a rope retracting mechanism 30, a rope 40, and a support 50, wherein the lifting rod unit 10 is disposed along a lifting direction and one end of the lifting rod unit 10 is fixed on the support 50, the elastic jacking unit 20 is disposed in the lifting rod unit 10 to provide an elastic force to the lifting rod unit 10, the rope 40 passes through the lifting rod unit 10 and the elastic jacking unit 20 along the lifting direction and is connected to the rope retracting mechanism 30, and the rope retracting mechanism 30 is mounted on the support 50.

The lifting loop bar unit 10 comprises at least two loop bars 11 arranged along the lifting direction, the at least two loop bars 11 are sequentially sleeved from outside to inside or from inside to outside around the lifting direction, and the adjacent loop bars 11 can move along the lifting direction relatively. That is, the lifting loop bar unit 10 includes N loop bars 12 (N is an integer, and N is greater than or equal to 2) sequentially sleeved in the lifting direction, and the i-th loop bar 12 is sleeved outside the i-1-th loop bar (i is an integer, and i is greater than or equal to 2 and less than or equal to N). In the illustrated embodiment, the lifting loop bar unit 10 includes 5 loop bars 11, the outermost loop bar 11 (the nth loop bar 11) is fixed on the support 50 through a flange plate extending outward from the lower end, and the inner loop bar 11 (the N-1 loop bar 11, … …, 1 st loop bar 11) can move relatively in the lifting direction in sequence. Each section of the loop bar 11 has a substantially equal height in the lifting direction, so that the loop bars 11 can be nested until being retracted into the nth section of the loop bar 11, thereby achieving the purpose of reducing the height of the lifting loop bar unit 10 in the lifting direction in the retracted state.

The top of the lifting loop bar unit 10 is further provided with an end cover 12, a rope threading hole 121 is formed in the end cover 12 along the lifting direction, and the end cover 12 is installed on the loop bar 11 at the topmost end to close the middle hole of the loop bar 11 and provide a fixing position for the rope 40. In other embodiments, the topmost loop bar 11 may also be designed in the shape of a closed top surface with a stringing hole.

The elastic jacking unit 20 comprises at least one elastic member 21, and each elastic member 21 is arranged between adjacent loop bars 11 (i-th loop bar 11 and i-1 st loop bar 11) along the lifting direction, so as to provide an elastic force for one loop bar 11 (i-1 st loop bar 11) to lift relative to the other loop bar 11 (i-th loop bar 11) in the lifting direction. That is, the elastic force of the elastic member 21 between the ith link 11 and the ith-1 link 11 causes the ith-1 link 11 to protrude from the ith link 11. In the illustrated embodiment, since the lifting bar unit 10 includes 5 sections of the lifting bar 11, the elastic jacking unit 20 correspondingly includes 4 elastic members 21. In the illustrated embodiment, the elastic member 21 employs a compression spring; in other embodiments, the elastic member 21 may be other cylindrical elastic members, such as elastic rubber.

The rope retracting mechanism 30 includes a rope winding wheel 31 and a servo motor 32, and a rope winding wheel shaft of the rope winding wheel 31 is rotatably mounted on the support and connected with a power output shaft of the servo motor 32, so that the power output by the servo motor 32 is transmitted to a rope winding wheel shaft through the power output shaft, and the rope winding wheel 31 is driven to rotate. In the illustrated embodiment, the rope retracting mechanism 30 is directly provided at the bottom of the lifting rod unit 10, and the rope 40 directly passes through the rope winding wheel 31 in the lifting direction; in other embodiments, the rope retraction and release mechanism 30 may be provided at one side of the lifting rod unit 10 to which the rope is connected after being reversed by the fixed pulley, and the rope winding wheel 31 of the rope retraction and release mechanism 30 may be provided, so that the size of the lifting apparatus in the lifting direction may be reduced to be suitable for various scenes.

The rope 40 extends in the lifting direction, a first end 41 of the rope 40 is connected to one end (top end) of the lifting loop bar unit 10, and a second end 42 of the rope passes through all loop bars 11 of the lifting loop bar unit 10 and all elastic members 21 of the elastic jacking unit 20 in the retracting direction, is wound around the rope winding wheel 31, and is fixed on the support 50. Since the second end 42 of the rope 40 is connected to the rope winding wheel 31 of the rope retracting mechanism 30, the rope 40 can be wound around the rope winding wheel 31 when the rope winding wheel 31 rotates, so that the rope 40 can be retracted by controlling the rotation of the rope winding wheel 31 by the servo motor 32. That is, the servo motor 32 controls the wrap wheel 31 to rotate to wrap the second end 42 of the rope 40 around the wrap wheel 31, thereby reducing the length of the rope 40 in the ascending and descending direction (the height of the first end 41 is decreased accordingly); the servomotor 32 controls the reverse rotation of the winding sheave 31 to release the expansion and contraction wound around the winding sheave 31, thereby increasing the length of the rope 40 in the lifting direction (the height of the first end 41 is raised accordingly).

To increase the life of the cable 40 and to ensure that the cable 40 provides sufficient tension, a strong and durable steel cable may be used for the cable 40.

The support 50 is a frame structure disposed on the lift pin unit 10 to facilitate the installation and fixation of the lift pin unit 10 and the rope retracting mechanism 30. It is to be understood that the structure and shape of the support 50 are not limited to those shown in the drawings, and only function to provide a mounting structure for the lift rod unit 10 and the rope retracting mechanism 30; in addition, the lifting sleeve rod unit 10 and the rope retracting mechanism 30 can be respectively arranged on two mutually independent supports.

Referring to fig. 3, in order to implement the installation of the elastic element 21, except for the nth loop bar 11 at the outermost layer, the outer walls of the other loop bars 11 (the 1 st loop bar to the N-1 st loop bar) are provided with a shaft shoulder 111, so that one end (upper end) of the elastic element 21 can be abutted against the shaft shoulder 111; correspondingly, except for the 1 st loop bar 11 and the nth loop bar 11 at the innermost layer, the lower ends of the rest loop bars 11 extend inward to form an inner edge 112, so that the other end (lower end) of the elastic member 21 can abut against the inner edge 112. Between the nth loop bar 11 of the outermost layer and the nth-1 loop bar 11 of the secondary outer layer, the upper end of the elastic member 21 is clamped on the shoulder 111 of the nth-1 loop bar 11, and the lower end abuts on the support 50, as shown in fig. 4, 5 and 6.

In order to prevent relative rotation between the adjacent loop bars 11 and guide the lifting of the loop bars 11, in the adjacent loop bars 11, a positioning key 113 protrudes from the outer wall of the inner loop bar 11, correspondingly, a guide groove 114 is formed in the inner part of the outer loop bar 11 along the direction parallel to the lifting direction, and a positioning key 13 protrudes into the guide groove 114 and can move along the guide groove 114, thereby limiting the relative rotation between the loop bars 11 and guiding the direction of the relative movement. All there is navigation key 113 and guide way 114 to carry on spacingly between the adjacent loop bar 11, and lifting process in-process loop bar 11 can not take place the rotation because spacing each other, and elevating gear portion equipment top mountable camera equipment etc. can not take place to let the camera lens shoot the scene position after the relative rotation and lose and lead to the problem that can't use.

As shown in fig. 4, 5 and 6, a distance is left between the upper end of the guide groove 114 on the ith loop bar 11 and the upper end surface, and the positioning key 13 on the inner ith-1 loop bar 11 can be limited to ensure that the inner ith-1 loop bar 11 cannot be pulled out of the outer ith loop bar 11; the lower end of the guide groove 114 on the ith link 11 is communicated with the lower end surface to form an opening, the ith-1 st link 11 in the guide groove can be installed in the ith link 11 from the lower end of the ith link 11, and the positioning key 13 enters from the lower end opening of the guide groove 114, so that the installation between the adjacent links 11 is convenient.

In other embodiments, the positions of the positioning key 113 and the guiding groove 114 may be interchanged in order to prevent relative rotation between adjacent loop bars 11 and guide the lifting and lowering of the loop bars 11. That is, the inner wall of the ith link 11 protrudes out of the positioning key 113, and the outer wall of the ith-1 link 11 is provided with a guide groove 114 parallel to the lifting direction to limit the movement of the ith-1 link relative to the ith link 11 to the movement along the lifting direction. The upper end of the guide groove 114 is communicated with the upper end face of the i-1 st section of loop bar 11 to form an opening, the i-1 st section of loop bar 11 in the guide groove can be installed in the i-1 st section of loop bar 11 from the lower end of the i-1 st section of loop bar 11, and the positioning key 13 enters from the opening at the upper end of the guide groove 114, so that the installation between the adjacent loop bars 11 is facilitated; the lower end of the guide groove 114 is spaced from the lower end surface of the i-1 th loop bar 11, and the positioning key 13 on the i-1 th loop bar 11 can be limited to ensure that the i-1 th loop bar 11 inside cannot be separated from the i-1 th loop bar 11 outside.

In order to provide a storage space for the compressed elastic members 21, an insertion section 115 with a certain height is arranged between the shaft shoulder 111 and the lower end surface of the loop bar 11, the outer diameter of the insertion section 115 is smaller than the inner diameter of the corresponding elastic member 21, and the height of the insertion section 115 in the lifting direction is larger than the minimum compression height of the corresponding elastic member 21. The elastic element 21 can be disposed inside the i-th loop bar 11, and the upper portion of the elastic element 21 is sleeved on the insertion section 115 of the i-1 st loop bar 11 and the upper end of the elastic element abuts against the shoulder 111. The arrangement of the shaft shoulder 111 enables each loop bar 11 inside to have an embedded section 115, and the embedded section 115 is still located inside the loop bar 11 outside when the loop bar 11 outside is completely lifted, so that a certain length is reserved between the loop bars 11 and still embedded together to have better stability, and shaking cannot occur, so that the limitation of use scenes is removed, and the device can be applied to devices such as cameras and the like which need stable working environments.

Referring to fig. 7 and 8, the operation of the lifting device is as follows: the servo motor 32 is energized to start rotating the rope winding wheel 31, and the rope 40 is wound or released by the rotation of the rope winding wheel 31.

When the servomotor 32 rotates forward, the rope winding sheave 31 releases the rope 40, the length of the portion of the rope 40 extending in the lifting direction increases, and the elasticity of the elastic member 21 between the adjacent loop bars 11 is released, so that the elastic member 21 increases in length, and the lifting movement of the lifting mechanism is effected relative to the lifting of the loop bars 11, and is completely lifted as shown in fig. 7.

Similarly, when the winding sheave 31 rotates the winding rope 40 by the reverse rotation of the servomotor 32, the length of the extending portion of the rope 40 in the lifting direction is shortened, and the adjacent loop bars 11 are forced to compress the elastic members 21, thereby achieving the relative retraction of the loop bars. As shown in fig. 8, when the lifting rod unit 10 is fully retracted, the elastic member 21 is compressed and then placed at the shoulder 111 of the inner rod 11 to the end portion (outside the insertion section 115), so that the inner rod 11 can fully fall back to the bottom of the outer rod 11, and no additional space is required to accommodate the elastic member 21, thereby minimizing the size in the retracted state and being suitable for use in a small space. In addition, even under the complete retraction state, elastic component 21 can also have certain flexible volume at the one end of loop bar 11, can not compressed to minimum size, consequently, can not appear influencing life's problem because of elastic component 21 overcompression, and life has obtained very big promotion relatively.

The lifting device adopts the matching of the loop bar, the elastic part and the rope to form a lifting structure, and each part has simple structure, convenient processing and extremely low cost, thereby being very suitable for occasions with various requirements, low cost and high performance. The lifting device of application only needs to be according to placing every section loop bar length of space height determination, and the suitable increase loop bar festival number of lift stroke as required, the weight of article lift as required select the suitable servo motor of moment of torsion and the suitable elastic component of elasticity can, need not be by the narrow and small restriction lifting device's in space use, servo motor's use has also avoided the difficulty that need provide air supply and hydraulic pressure source etc..

It should be noted that, in this document, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising a … …" does not exclude the presence of another identical element in a process, method, article, or apparatus that comprises the element.

The above description is only for the specific embodiments of the present application, but the scope of the present application is not limited thereto, and any person skilled in the art can easily conceive of the changes or substitutions within the technical scope of the present application, and shall be covered by the scope of the present application. Therefore, the protection scope of the present application shall be subject to the protection scope of the claims.

Claims (10)

1. A lift apparatus, comprising:

the lifting loop bar unit (10) comprises N loop bars (11) arranged along a lifting direction, the N loop bars (11) are sequentially sleeved from outside to inside or from inside to outside along the lifting direction, the adjacent loop bars (11) can relatively move along the lifting direction, N is an integer and is more than or equal to 2;

the elastic jacking unit (20) comprises at least one elastic piece (21), the at least one elastic piece (21) is arranged between the ith section of loop bar (11) and the ith-1 section of loop bar (11) along the lifting direction so as to provide elastic force for the ith-1 section of loop bar (11) to lift relative to the ith section of loop bar (11) in the lifting direction, i is an integer and is more than or equal to 2 and less than or equal to N;

a rope retracting mechanism (30); and

a rope (40) with one end connected to the loop bar (11) at the top end and the other end connected to the rope retracting mechanism (30) in a retractable manner along the lifting direction through the lifting loop bar unit;

a shaft shoulder (111) is arranged on the outer wall of the i-1 th sleeve rod (11), and an embedded section (115) is formed between the shaft shoulder (111) and the lower end face of the i-1 th sleeve rod (11); the elastic piece (21) is arranged in the ith sleeve rod (11), sleeved on the embedding section (115) of the (i-1) th sleeve rod (11) and abutted against the shaft shoulder (111) at one end.

2. The lifting device according to claim 1, characterized in that: the bottom end of the i-1 th loop bar (11) extends inwards to form an inner edge, and the other end of the elastic piece (21) abuts against the inner edge.

3. The lifting device according to claim 2, characterized in that: the N-th sleeve rod (11) is provided with a flange plate used for fixing the lifting sleeve rod unit (10), and the flange plate extends outwards from the lower end of the N-th sleeve rod (11).

4. The lifting device according to claim 1, characterized in that: a guide groove (114) parallel to the lifting direction is formed in the inner wall of the i-th section of the loop bar (11), a positioning key (113) protrudes out of the outer wall of the i-1-th section of the loop bar (11), and the positioning key (113) is arranged in the guide groove (114) to limit the movement of the i-1-th section of the loop bar (11) relative to the i-th section of the loop bar (11) to be movement along the lifting direction;

the distance is reserved between the upper end of the guide groove (114) and the upper end face of the ith sleeve rod (11), and the lower end of the guide groove (114) is communicated with the lower end face of the ith sleeve rod (11) to form an opening.

5. The lifting device according to claim 1, characterized in that: a positioning key (113) protrudes out of the inner wall of the ith sleeve rod (11), and a guide groove (114) parallel to the lifting direction is formed in the outer wall of the ith-1 sleeve rod (11) so as to limit the movement of the ith-1 sleeve rod relative to the ith sleeve rod (11) to be the movement along the lifting direction;

the upper end of the guide groove (114) is communicated with the upper end face of the i-1 st section of the loop bar (11) to form an opening, and a distance is reserved between the lower end of the guide groove (114) and the lower end face of the i-1 st section of the loop bar (11).

6. The lifting device as claimed in claim 1, characterized in that: the heights of the N sections of loop bars (11) in the lifting direction are basically equal.

7. The lifting device as claimed in claim 1, characterized in that: the elastic piece (21) is a compression spring, and the rope (40) is a steel wire rope.

8. The lifting device according to any one of claims 1 to 7, characterized in that: the rope retracting mechanism (30) comprises a rope winding wheel (31) and a servo motor (32), the other end of the rope (40) is connected to the rope winding wheel (31), and a power output shaft of the servo motor (32) is connected to the rope winding wheel (31).

9. The lifting device as claimed in claim 8, characterized in that: the rope retracting and releasing mechanism (30) is arranged at the bottom of the lifting loop bar unit (10) along the lifting direction, and the other end of the rope (40) is directly connected to the rope winding wheel (31) along the lifting direction; or the rope retracting mechanism (30) is arranged on one side of the lifting sleeve rod unit (10), and the other end of the rope (40) is connected to the rope winding wheel (31) after winding the fixed pulley.

10. The lifting device as claimed in claim 8, characterized in that: the lifting device further comprises a support (50), and the Nth loop bar (11), the rope winding wheel (31) and the servo motor (32) are fixed on the support (50).

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