CN217141886U

CN217141886U - Skin tensioning mechanism

Info

Publication number: CN217141886U
Application number: CN202123338241.1U
Authority: CN
Inventors: 贾炬; 蔡金龙; 赵前进; 刘子仪; 高航行; 刘大永
Original assignee: Tianjin Guangtong Automobile Co ltd; Gree Altairnano New Energy Inc
Current assignee: Tianjin Guangtong Automobile Co ltd; Gree Altairnano New Energy Inc
Priority date: 2021-12-27
Filing date: 2021-12-27
Publication date: 2022-08-09
Anticipated expiration: 2031-12-27

Abstract

The application relates to the field of automobiles, and provides a skin tensioning mechanism, which comprises: the clamping assembly is movably arranged on the fixing frame assembly and comprises at least one pair of first clamping plates, at least one pair of second clamping plates and at least one pair of first driving parts, the at least one pair of first clamping plates and the at least one pair of second clamping plates are movably arranged on the fixing frame assembly relatively, the at least one pair of first driving parts respectively drive the at least one pair of first clamping plates and the at least one pair of second clamping plates, the skin clamping device comprises at least one pair of first clamping plates and at least one pair of second clamping plates, the second clamping plates are movably arranged on a fixed frame assembly, a part of a tension assembly is arranged on the fixed frame assembly, the tension assembly comprises at least one pair of driving structures, the at least one pair of driving structures are fixedly connected with the at least one pair of second clamping plates, and the at least one pair of driving structures can drive the at least one pair of second clamping plates to move oppositely.

Description

Skin tensioning mechanism

Technical Field

The application relates to the field of automobiles, in particular to a skin tensioning mechanism.

Background

In the existing automobile production and manufacturing process, the side wall skin generally needs to adopt a tension process to ensure the flatness of the skin, the installation of the side skin is divided into a front section and a rear section, when the skin is installed, the front section and the rear section of the skin need to be subjected to tension twice respectively, and then the skins are sequentially welded and fixed according to the process requirements to complete the tension work of the whole right side skin.

However, the existing skin installation adopts a simple mechanical tension mechanism, the tension force is limited, the skin flatness cannot meet the requirement, the skin appearance quality is poor, the skin installation utilizes a lead screw thread rotation stretching principle, manual stretching is performed, the operation is inconvenient, the efficiency is low, in addition, the front section skin and the rear section skin need to be subjected to twice tension operations, and the working efficiency is low.

SUMMERY OF THE UTILITY MODEL

The application provides a covering tensioning mechanism to it is limited to solve the tensioning force, and the covering roughness can not reach the requirement, and covering appearance quality is relatively poor, and the covering installation utilizes the rotatory tensile principle of lead screw thread moreover, and manual stretching, the operation is inconvenient, the inefficiency problem.

In order to solve the above technical problem or at least partially solve the above technical problem, the present application provides a skin tensioning mechanism, including a fixing frame assembly, a clamping assembly and a tensioning assembly, wherein the clamping assembly is movably disposed on the fixing frame assembly, the clamping assembly includes at least one pair of first clamping plates, at least one pair of second clamping plates, and at least one pair of first driving members, the at least one pair of first clamping plates and the at least one pair of second clamping plates are movably disposed on the fixing frame assembly, the at least one pair of first driving members respectively drive the at least one pair of first clamping plates and the at least one pair of second clamping plates to clamp a skin placed between the at least one pair of first clamping plates and between the at least one pair of second clamping plates, the second clamping plates are movably disposed on the fixing frame assembly, and a portion of the tensioning assembly is disposed on the fixing frame assembly, the tension assembly comprises at least one pair of driving structures, the at least one pair of driving structures are fixedly connected with the at least one pair of second clamping plates, and the at least one pair of driving structures can drive the at least one pair of second clamping plates to move oppositely.

In one embodiment, at least one pair of the driving structures includes a second driving member, a third driving member and two pairs of connecting members, the second driving member and the third driving member are disposed opposite to each other, the second driving member and the third driving member are respectively and fixedly connected to the two pairs of connecting members, and the two pairs of the connecting members are respectively and fixedly connected to at least one pair of the first clamping plates and at least one pair of the second clamping plates.

In one embodiment, the gear rack driving device further comprises at least two pairs of racks and at least two gears, the at least two pairs of racks are arranged side by side, wherein one pair of racks is connected with one second driving member, the other pair of racks is connected with the other third driving member, the racks are respectively connected with the connecting member, each pair of racks is arranged at an interval, and the two gears are respectively arranged between each pair of racks.

In one embodiment, the second driving member and the third driving member are disposed on the same side, or the second driving member is disposed on the opposite side of the third driving member, and the second driving member and the third driving member always drive the first clamping plate and the second clamping plate to move relatively.

In one embodiment, the fixing frame assembly includes a first fixing frame and a second fixing frame, the second fixing frame is disposed on the first fixing frame, at least one pair of the first clamping plates and at least one pair of the second clamping plates are disposed on the first fixing frame and are respectively disposed at two sides of the second fixing frame, and at least one pair of the driving structures is disposed on the second fixing frame.

In one embodiment, the clamping device further comprises two fixing plates, the two fixing plates are movably arranged on the first fixing frame and are respectively arranged on two sides of the second fixing frame, and at least one pair of the first clamping plates and at least one pair of the second clamping plates are respectively arranged on the two fixing plates.

In one embodiment, two of the fixing plates are respectively connected with the driving structure, and the driving structure drives the two fixing plates to approach each other.

In one embodiment, the pair of first clamping plates comprises a first fixing plate and a first moving plate, the first fixing plate is movably arranged on the fixing frame assembly, the first moving plate is connected with the first driving piece, and the first driving piece can drive the first moving plate to move close to or far away from the first fixing plate.

In one embodiment, the lifting assembly is used for adjusting the height of the clamping assembly, and comprises a lifting piece which is connected with the fixed frame assembly.

In one embodiment, the lifting assembly further comprises a bottom plate and a connecting plate, the lifting piece is arranged on the bottom plate, pulleys are arranged on the lower surface of the bottom plate, and the connecting plate is connected with the lifting piece and the fixing frame assembly respectively.

The at least one pair of first clamping plates and the at least one pair of second clamping plates are movably arranged on the fixing frame component relatively, the at least one pair of first driving parts respectively drive the at least one pair of first clamping plates and the at least one pair of second clamping plates, so as to clamp the skin placed between at least one pair of the first clamping plates and at least one pair of the second clamping plates, avoid the skin from loosening in the pulling process, facilitate the stretching of the subsequent skin, the second clamping plate is movably arranged on the fixed frame component, part of the tension component is arranged on the fixed frame component, the tension assembly comprises at least one pair of driving structures, the at least one pair of driving structures are fixedly connected with the at least one pair of second clamping plates, and the at least one pair of driving structures can drive the at least one pair of second clamping plates to move oppositely. The tension-increasing force is improved, so that the flatness of the skin is greatly improved, namely the appearance quality of the skin is improved, the skin is prevented from being stretched manually, the skin is stretched automatically, the operation is more convenient, and the working efficiency is improved.

Drawings

The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the invention and together with the description, serve to explain the principles of the invention.

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious for those skilled in the art that other drawings can be obtained according to the drawings without inventive labor.

Fig. 1 is a skin tensioning mechanism according to an embodiment of the present disclosure;

FIG. 2 is an enlarged schematic view of a portion A of a skin tensioning mechanism provided as shown in FIG. 1;

FIG. 3 is another schematic angular configuration of a skin tensioning mechanism provided as shown in FIG. 1;

FIG. 4 is a schematic view of another angular configuration of a skin tensioning mechanism provided as shown in FIG. 1;

FIG. 5 is an enlarged schematic view of portion B of a skin tensioning mechanism provided as shown in FIG. 4;

fig. 6 is a schematic side view of a skin tensioning mechanism according to an embodiment of the present disclosure;

fig. 7 is another angle view of one side of the skin being stretched of a skin tensioning mechanism provided as shown in fig. 5.

100. A mounting bracket assembly; 110. a first fixing frame; 120. a second fixing frame; 130. a fixing plate; 200. a clamping assembly; 210. a first splint; 211. a first fixing plate; 212. a first motion plate; 220. a second splint; 221. a second fixing plate; 222. a second motion plate; 230. a first driving member; 300. a tension assembly; 310. a drive structure; 311. a second driving member; 312. a third driving member; 320. a connecting member; 330. a rack; 340. a gear; 400. a lifting assembly; 401. a lifting member; 402. a base plate; 403. a connecting plate; 404. a pulley; 405. a hydraulic pump; 406. a pull rod; 408. a transport pipe; 510. A front end skin; 520. a rear end skin; 600. a front door.

Detailed Description

In order to make the objects, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are some embodiments of the present application, but not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.

Fig. 1 is a schematic view of a skin tensioning mechanism provided in an embodiment of the present application.

The following embodiments need to refer to the schematic diagrams of fig. 1 to 6 at the same time, and embodiments of the present application provide a skin tensioning mechanism, including a fixed frame assembly 100, a clamping assembly 200, and a tensioning assembly 300, where the clamping assembly 200 is movably disposed on the fixed frame assembly 100, the clamping assembly 200 includes a first clamping plate 210, a second clamping plate 220, and a first driving member 230, the first clamping plate 210 and the second clamping plate 220 are movably disposed on the fixed frame assembly 100 relatively, and the first driving member 230 respectively drives the first clamping plate 210 and the second clamping plate 220 to clamp or release a skin placed between the first clamping plate 210 and the second clamping plate 220, so as to avoid a situation where the skin loosens during the tensioning process, and facilitate tensioning of a subsequent skin.

The first clamping plate 210 and the second clamping plate 220 are movably disposed on the fixing frame assembly 100, a portion of the tension assembly 300 is disposed on the fixing frame assembly 100, the tension assembly 300 includes the driving structure 310, the driving structure 310 is fixedly connected to the first clamping plate 210 and the second clamping plate 220, and the driving structure 310 can drive the first clamping plate 210 and the second clamping plate 220 to move towards each other. The lifting tension force is realized, so that the flatness of the skin is greatly improved, namely the appearance quality of the skin is improved, the skin is prevented from being manually stretched, the automatic stretching of the skin is realized, the operation is more convenient, and the working efficiency is improved.

It should be noted that, the clamping assembly 200 adopts a bidirectional synchronous clamping skin, that is, the first clamping plate 210 and the second clamping plate 220 can move in opposite directions under the driving of the driving structure 310, the first clamping plate 210 includes a first fixing plate and a moving plate, the fixing plate and the moving plate clamp the skin on one side of the first clamping plate 210, similarly, the second clamping plate 220 also includes a fixing plate and a moving plate, the fixing plate and the moving plate clamp the skin on one side of the second clamping plate 220, when the driving structure 310 drives the first clamping plate 210 and the second clamping plate 220 respectively, the first clamping plate 210 and the second clamping plate 220 clamp the skins on the corresponding sides respectively to move in opposite directions, and when the driving structure 310 and the second clamping plate 220 move in close proximity to each other, that is, the skins on two sides of the vehicle body move in close proximity to each other, so as to achieve simultaneous stretching of the skins.

Further, the first clamping plate 210 includes a first fixing plate 211 and a first moving plate 212, and the first driving member 230 is disposed at an interval between the first driving member and the second driving member, wherein the first moving plate is in driving connection with a plurality of first driving members 230, the first clamping plate 210 is movably connected with the fixing frame assembly 100, the plurality of first driving members 230 drive the first moving plate to approach or move away from the first fixing plate, so as to clamp or release the skin, thereby performing a function of clamping the skin, and similarly, the second clamping plate 220 includes a second fixing plate 221 and a second moving plate 222, the second clamping plate 220 is movably connected to the fixed frame assembly 100, the plurality of first driving members 230 drive the second moving plate of the second clamping plate 220 to approach or separate from the second fixed plate, so as to clamp or release the skins and further clamp the skins on two sides simultaneously. In an embodiment of the present application, the driving structure 310 includes a second driving element 311, a third driving element 312 and two pairs of connecting elements 320, the second driving element 311 and the third driving element 312 are disposed oppositely, the second driving element 311 and the third driving element 312 are respectively and fixedly connected to the two pairs of connecting elements 320, and the connecting elements 320 are respectively and fixedly connected to the first clamping plate 210 and the second clamping plate 220. The first clamping plate 210 and the second clamping plate 220 are driven to move towards each other by the second driving element 311 and the third driving element 312, so that the skin can be synchronously stretched, wherein the second driving element 311 and the third driving element 312 can be driven by a hydraulic pump 405 or an electric motor, and the first driving element 230 can also be driven by a hydraulic pump 405 or an electric motor. In fact, in order to drive the second driving element 311 and the third driving element 312, the pull rod 406 of the hydraulic pump 405 needs to be pulled, so that the pull rod 406 can press the hydraulic pressure in the hydraulic pump 405 into the transportation pipe 408 communicated with the hydraulic pump 405, and then the transportation pipe 408 transmits the hydraulic pressure to the second driving element 311, the third driving element 312 and the first driving element 230, and finally, the clamping and stretching effects on the skin are achieved.

In an embodiment of the present application, the driving device further comprises at least two pairs of racks 330 and at least two gears 340, the at least two pairs of racks 330 are disposed side by side, wherein one pair of racks 330 is connected to the second driving member 311, the other pair of racks 330 is connected to the third driving member 312, the racks 330 are respectively connected to the connecting member 320, the racks 330 of each pair are spaced apart from each other, and two gears 340 are respectively disposed between the racks 330 of each pair. The at least one pair of connecting members 320 is two pairs of connecting members 320, that is, four connecting members 320, one pair of racks 330 is respectively connected with two of the connecting members 320, two of the connecting members 320 are respectively connected with the at least one pair of first clamping plates 210 and the at least one pair of second clamping plates 220, the other pair of racks 330 is respectively connected with the other two connecting members 320, the other two connecting members 320 are respectively connected with the at least one pair of first clamping plates 210 and the at least one pair of second clamping plates 220, the two connecting members 320 are oppositely arranged, the second driving member 311 drives the pair of racks 330 to move so as to rotate the gear 340, so that the racks 330 move oppositely, and the connecting members 320 drive the at least one pair of first clamping plates 210 and the at least one pair of second clamping plates 220 to move oppositely, thereby realizing skin tensioning.

In one embodiment of the present application, the second driving element 311 is disposed on the same side as the third driving element 312, or the second driving element 311 is disposed on the opposite side of the third driving element 312, and the second driving element 311 and the third driving element 312 always drive the first clamping plate 210 and the second clamping plate 220 to move relatively. When the skin is clamped, the first clamping plate 210 and the second clamping plate 220 move relatively, namely the first clamping plate 210 and the second clamping plate 220 move close to each other, so that the skin is tensioned, the first clamping plate 210 and the second clamping plate 220 move away from each other, and the skin is loosened by driving the second driving piece 311 and the third driving piece 312.

In one embodiment of the present application, the fixing frame assembly 100 includes a first fixing frame 110 and a second fixing frame 120, the second fixing frame 120 is disposed on the first fixing frame 110, at least one pair of the first clamping plates 210 and at least one pair of the second clamping plates 220 are disposed on the first fixing frame 110 and respectively disposed at two sides of the second fixing frame 120, and at least one pair of the driving structures 310 is disposed on the second fixing frame 120. Through respectively setting up clamping component 200 and drive structure 310 on first mount 110 and second mount 120, and then can realize simultaneously that automatic clamp skin after, carry out the synchronous opposite stretching to both sides skin again, the skin effect of both sides is the same after the drawing like this to tensile skin's quality is showing and is improving.

In an embodiment of the present application, the fixing device further includes two fixing plates 130, the two fixing plates 130 are movably disposed on the first fixing frame 110 and are respectively disposed at two sides of the second fixing frame 120, and at least one pair of the first clamping plates 210 and at least one pair of the second clamping plates 220 are respectively disposed on the two fixing plates 130. The two fixing plates 130 are respectively connected with the driving structure 310, and the driving structure 310 drives the two fixing plates 130 to approach each other. The fixing plates 130 on the two sides are respectively driven by the driving structures 310, so that at least one pair of the first clamping plates 210 and at least one pair of the second clamping plates 220 arranged on the fixing plates 130 are driven to move in opposite directions, and the synchronous stretching of the skins is realized twice.

In one embodiment of the present application, the first clamping plate 210 includes a first fixing plate 211 and a first moving plate 212, the first clamping plate 210 is movably disposed on the fixing frame assembly 100, the first moving plate 212 is connected to the first driving member 230, and the first driving member 230 can drive the first moving plate 212 to move close to or away from the first fixing plate 211. In fact, the second clamping plate 220 also includes a second fixing plate 221 and a second moving plate 222, the second clamping plate 220 is movably disposed on the fixing frame assembly 100, the second moving plate 222 is connected to the first driving member 230, and the first driving member 230 can drive the second moving plate 222 to move closer to or away from the second fixing plate 221. In the present application, the first driving member 230 drives the first moving plate 212 to move close to or away from the first fixing plate 211, that is, the first moving plate 212 moves close to the first fixing plate 211, which is indicated as a clamping state, and the first moving plate 212 moves away from the first fixing plate 211, which is indicated as a loosening state, in fact, the present application may also be configured such that the first moving plate 212 and the first fixing plate 211 move close to or away from each other at the same time.

In addition, the second fixing frame 120 is located at a central region of the first fixing frame 110, and the first clamping plate 210 and the second clamping plate 220 are located at both side regions of the first fixing frame 110. The second fixing frame 120 is arranged on the central area of the first fixing frame 110, so that the driving structure 310 can also be located at the central position of the fixing frame assembly 100, and further, the driving force of the driving structure 310 driving the pair of first clamping plates 210 and the pair of second clamping plates 220 on both sides is the same, and finally, the effect of stretching the skins on both sides is the same, and further, the stretching quality is improved.

In one embodiment of the present application, a lifting assembly 400 is further included for adjusting the height of the clamping assembly 200, the lifting assembly 400 includes a lifting member 401, and the lifting member 401 is connected to the fixing frame assembly 100. In order to enable the pair of first clamping plates 210 and the pair of second clamping plates 220 in the clamping assembly 200 to be respectively aligned with the skin tensioning ends, the height positions of the pair of first clamping plates 210 and the pair of second clamping plates 220 are adjusted by adjusting the lifting mechanism in the lifting assembly 400, so that the pair of first clamping plates 210 and the pair of second clamping plates 220 can better clamp the skin tensioning ends.

In an embodiment of the present application, the lifting assembly 400 further includes a bottom plate 402 and a connecting plate 403, the lifting member 401 is disposed on the bottom plate 402, a pulley 404 is disposed on a lower surface of the bottom plate 402, and the connecting plate 403 is respectively connected to the lifting member 401 and the fixing frame assembly 100. The whole skin stretching mechanism is pushed to move through the pulleys 404 on the lower surface of the bottom plate 402, so that the whole skin stretching mechanism is convenient to transport, and the height of the lifting piece 401 is adjusted, so that the height of the whole fixed frame assembly 100 is adjusted, and the height of the position of the clamping assembly 200 is influenced.

In another embodiment, a plurality of hydraulic pumps are arranged on the lifting piece and connected with the driving structure 310, and the driving structure 310 is further controlled to drive the first clamping plate 210 and the second clamping plate 220 in the clamping assembly 200 to move oppositely by controlling the hydraulic pumps, so that the skin flatness is greatly improved, namely, the appearance quality of the skin is improved, the skin is prevented from being stretched manually, the automatic stretching of the skin is realized, the operation is more convenient, and the working efficiency is improved.

Further, as shown in fig. 5 and fig. 6, the clamping assemblies 200 in the skin tensioning mechanism respectively clamp the front skin 510 and the rear skin 520, and then the tensioning assembly 300 pulls the front skin 510 and the rear skin 520 to be tensioned, if the positions of the clamping assemblies 200 for clamping the front skin 510 and the rear skin 520 are not proper, the proper clamping positions can be found finally by adjusting the heights of the lifting assemblies 400 to further raise and lower the positions of the clamping assemblies 200. Wherein, the integral side of the skin is provided with a front door 600, and the skin tensioning mechanism is arranged at the rear door.

It is noted that, in this document, relational terms such as "first" and "second," and the like, are used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, 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 an … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.

The above description is only exemplary of the invention, and is intended to enable those skilled in the art to understand and implement the invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A skin tensioning mechanism is characterized by comprising:

a mounting bracket assembly;

the clamping assembly is movably arranged on the fixing frame assembly and comprises at least one pair of first clamping plates, at least one pair of second clamping plates and at least one pair of first driving parts, the at least one pair of first clamping plates and the at least one pair of second clamping plates are movably arranged on the fixing frame assembly, the at least one pair of first driving parts respectively drive the at least one pair of first clamping plates and the at least one pair of second clamping plates so as to clamp the skin placed between the at least one pair of first clamping plates and the at least one pair of second clamping plates, and the second clamping plates are movably arranged on the fixing frame assembly;

the part of the tension assembly is arranged on the fixing frame assembly, the tension assembly comprises at least one pair of driving structures, the at least one pair of driving structures are fixedly connected with the at least one pair of second clamping plates, and the at least one pair of driving structures can drive the at least one pair of second clamping plates to move oppositely.

2. The skin tensioning mechanism according to claim 1, wherein the at least one pair of driving structures includes a second driving member, a third driving member, and two pairs of connecting members, the second driving member and the third driving member are disposed opposite to each other, the second driving member and the third driving member are respectively and fixedly connected to the two pairs of connecting members, and the two pairs of connecting members are respectively and fixedly connected to the at least one pair of first clamping plates and the at least one pair of second clamping plates.

3. The skin tensioning mechanism according to claim 2, further comprising at least two pairs of racks and at least two gears, wherein the at least two pairs of racks are disposed side by side, one pair of racks is connected to the second driving member, the other pair of racks is connected to the third driving member, the racks are respectively connected to the connecting members, the racks of each pair are disposed at intervals, and the two gears are disposed between the racks of each pair respectively.

4. The skin tensioning mechanism according to claim 2, wherein the second driving member and the third driving member are disposed on the same side, or the second driving member is disposed on the opposite side of the third driving member, and the second driving member and the third driving member always drive the first clamping plate and the second clamping plate to move relatively.

5. The skin tensioning mechanism according to any one of claims 1 to 4, wherein the mounting bracket assembly comprises a first mounting bracket and a second mounting bracket, the second mounting bracket is disposed on the first mounting bracket, at least one pair of the first clamping plates and at least one pair of the second clamping plates are disposed on the first mounting bracket and are respectively disposed on two sides of the second mounting bracket, and at least one pair of the driving structures is disposed on the second mounting bracket.

6. The skin tensioning mechanism according to claim 5, further comprising two fixing plates movably disposed on the first fixing frame and respectively disposed at two sides of the second fixing frame, wherein at least one pair of the first clamping plates and at least one pair of the second clamping plates are respectively disposed on the two fixing plates.

7. The skin tensioning mechanism according to claim 6, wherein the two fixing plates are respectively connected to the driving structure, and the driving structure drives the two fixing plates to approach each other.

8. The skin tensioning mechanism according to claim 1, wherein the pair of first clamping plates includes a first fixing plate and a first moving plate, the first fixing plate is movably disposed on the fixing frame assembly, the first moving plate is connected to the first driving member, and the first driving member is capable of driving the first moving plate to move closer to or away from the first fixing plate.

9. The skin tensioning mechanism according to claim 1, further comprising a lifting assembly for adjusting the height of the clamping assembly, wherein the lifting assembly comprises a lifting member, and the lifting member is connected with the fixing frame assembly.

10. The skin tensioning mechanism according to claim 9, wherein the lifting assembly further comprises a lifting member, a bottom plate, and a connecting plate, the lifting member is disposed on the bottom plate, a pulley is disposed on a lower surface of the bottom plate, and the connecting plate is respectively connected to the lifting member and the fixing frame assembly.