CN113401849A

CN113401849A - Lifting mechanism with protection function

Info

Publication number: CN113401849A
Application number: CN202110777023.3A
Authority: CN
Inventors: 李东辉
Original assignee: Shenzhen Hetai Innovation Technology Co ltd
Current assignee: Shenzhen Hetai Innovation Technology Co ltd
Priority date: 2021-07-09
Filing date: 2021-07-09
Publication date: 2021-09-17
Anticipated expiration: 2041-07-09
Also published as: CN113401849B

Abstract

The invention relates to a lifting mechanism with a protection function, which comprises a rear cover, a driving assembly, a fixed cover, a storage table, a driving ring cylinder, a support frame, a protection assembly and a front cover, wherein the rear cover is fixedly connected with the front cover; wherein the driving component can drive the driving ring barrel to rotate; when the driving ring barrel rotates, the driving limiting groove on the driving ring barrel can drive the object placing table to do lifting motion; the protective assembly is arranged between the front cover and the supporting frame and comprises a plurality of openable protective sheets, and the protective sheets can be driven to open and close when the object placing table is lifted; and the object placing table can stably stay at any position in the lifting process.

Description

Lifting mechanism with protection function

Technical Field

The invention relates to a lifting mechanism, in particular to a lifting mechanism with a protection function.

Background

The lifting type shelf (such as the lifting type cup holder for the automobile) has the characteristics of wide application range, adaptability to articles with different heights and the like, and is widely applied to the fields of automobiles, travelling wheels and the like. The existing lifting mechanism used in the lifting shelf has many defects, such as more structural parts, poor reliability, larger occupied space and the like. The patent of application number 202110037208.0 discloses a lifting mechanism, which comprises a driving seat, a cup seat and a supporting plate; the driving seat is provided with an accommodating cavity and a driving chute; the cup seat is arranged in the accommodating cavity, the driving seat can rotate relative to the cup seat, and the cup seat is provided with a cup cavity; the supporting plate is arranged in the cup cavity in a lifting mode, at least one driving shaft is arranged on the edge of the supporting plate, and the driving shaft penetrates through the driving chute; when the cup stand lifting device works, the cup stand is driven to lift by the rotation of the driving seat; however, such a lifting mechanism has the following disadvantages: (1) when the supporting plate descends, the preventing holes cannot be sealed and protected, so that objects on the supporting plate cannot be effectively protected, the supporting plate is not attractive, is low in price and does not have high-grade feeling; (2) in the lifting process, the supporting plate can not be stopped at any position, the requirement on the height of the placed object is strict, and the application range is small.

Disclosure of Invention

Aiming at the defects of the prior art, the invention aims to provide a lifting mechanism with a protection function, and the specific technical scheme is as follows:

the invention discloses a waterproof lifting mechanism with a protection function, which comprises a rear cover, a driving assembly, a fixed cover, a storage table, a driving ring cylinder, a support frame, a protection assembly and a front cover; the driving assembly is fixed on the rear cover through the fixing cover; the bottom of the support frame is fixedly arranged on the rear cover;

the driving ring barrel is rotatably arranged in the support frame, a plurality of spiral driving limiting grooves are formed in the wall of the driving ring barrel, and the driving assembly can drive the driving ring barrel to rotate; the object placing table is arranged in the driving ring cylinder, the object placing table is disc-shaped, a plurality of bosses are uniformly distributed on the periphery of the object placing table, the number of the bosses is the same as that of the driving limiting grooves, the bosses are arranged in the driving limiting grooves in a sliding manner, and the driving limiting grooves can drive the bosses to move up and down when the driving ring cylinder rotates;

the front cover fixedly connected with the top of the support frame, the protection assembly is arranged between the front cover and the support frame and comprises a plurality of protection pieces capable of being opened and closed, and the bosses can drive the protection pieces to be opened and closed when lifting.

Preferably, the fixed cover is fixedly arranged on the rear cover in a screw or buckle mode; the rear cover is provided with a position limiting structure of the object placing table.

Further, the driving assembly comprises a driving motor, a worm wheel and a gear, the worm wheel and the gear are fixedly connected or integrally formed and can synchronously rotate around the same rotating shaft, the worm is fixedly arranged on a driving shaft of the driving motor, and the worm is meshed with the worm wheel.

Furthermore, the driving ring barrel is a stepped ring barrel, and is provided with a driving upper barrel part with a smaller diameter and a driving lower barrel part with a larger diameter, and the number of the driving limiting grooves is at least 2 and symmetrically arranged on the barrel wall of the driving upper barrel part in a penetrating manner; and a gear ring is arranged on the inner circumferential surface of the lower driving barrel part and meshed with the gear.

Further, the boss is cylindrical, a mounting groove used for assembling the boss is formed in the lower driving cylinder, the mounting groove is connected with the driving limiting groove along the axial direction of the driving ring cylinder, and the radial position of the mounting groove is arranged within the radial position of the tooth top of the gear ring.

Further, the support frame comprises a support frame lower cylinder part and an annular mounting disc positioned on the periphery of the upper end face of the support frame lower cylinder part; the top of the support frame is provided with a support frame limiting table, the rear cover is provided with a rear cover limiting table, and the support frame limiting table and the rear cover limiting table limit the axial movement space of the driving ring barrel to enable the driving ring barrel to basically keep immovable in the axial direction.

Furthermore, a plurality of driving ring barrel limiting ribs are uniformly arranged on the inner wall of the lower barrel part of the support frame along the circumferential direction, the outer ends of the driving ring barrel limiting ribs limit the radial space of the driving ring barrel together, and the driving ring barrel rotates in the radial space.

Furthermore, be equipped with the direction spacing groove of vertical direction on the support frame lower barrel portion inner wall, the quantity of direction spacing groove is the same with the quantity of drive spacing groove, the boss runs through behind the drive spacing groove with direction spacing groove clearance fit, works as when the drive ring section of thick bamboo is rotatory, the boss is by the dual spacing of drive spacing groove and direction spacing groove and along the direction spacing groove do elevating movement.

Furthermore, a plurality of arc-shaped mounting holes are uniformly formed in the annular mounting disc along the circumferential direction, a limiting sleeve is fixedly and concentrically nested in the lower cylinder part of the support frame, and a limiting ring cylinder space is defined by the limiting sleeve and the inner wall of the lower cylinder part of the support frame;

the protection assembly further comprises a driven ring, the driven ring is provided with a circular ring structure, a plurality of stress walls are uniformly distributed on the circular ring structure along the axial direction, the number of the stress walls is consistent with that of the bosses, the stress walls are provided with straight surface parts and inclined surface parts connected with the straight surface parts, and the straight surface parts are parallel to the central line of the circular ring structure; a plurality of driven ring mounting points and a plurality of sections of driven ring tooth parts are uniformly arranged on the circumferential direction of the circular ring structure; the stress wall of the driven ring penetrates through the arc-shaped mounting hole and is inserted into the space of the limiting ring cylinder, and when the boss rises and is in contact with the inclined surface part, the driven ring can be pushed to rotate;

the protective plate is provided with a blade, a mounting hole, a protective plate tooth part and a limiting groove, the blade is positioned at the upper part of the protective plate tooth part, and the bottom of the blade is higher than the upper surface of the circular ring structure of the driven ring, so that interference cannot occur during movement; the protective plate rotates through the mounting hole and is installed epaxial on the annular mounting disc, and protective plate tooth portion and driven ring tooth portion mesh, and when the driven ring rotated, driven ring tooth portion drive protective plate tooth portion rotatory to drive the blade and rotate, realize opening and shutting of protective plate.

Preferably, the front cover is fixedly connected with the annular mounting disc, a plurality of supporting ribs are arranged on the annular mounting disc, a plurality of front cover limiting ribs are arranged on the front cover, and the supporting ribs and the front cover limiting ribs limit the axial space of the protection sheet, so that the protection sheet can only rotate along the shaft; the number of the guard plates is the same as that of the driven ring teeth.

Furthermore, a plurality of limiting bosses are arranged on the front cover, and the limiting bosses penetrate through limiting grooves in the protection sheet to limit the driven ring in the support frame, so that the driven ring can only rotate in the support frame.

Furthermore, the protection assembly further comprises a plurality of reset elastic pieces, two ends of each reset elastic piece are respectively fixed to the installation point of the annular installation disc and the installation point of the driven ring and have certain pretension force, and the number of the installation points of the annular installation disc is the same as that of the installation points of the driven ring.

The invention has the following beneficial technical effects:

(1) the lifting of the object placing table and the linkage of the opening and closing of the protective sheet can be realized by only using one driving assembly, the structure is simple, and the science and technology sense and the high-grade sense are strong; after the object placing table descends, the protection sheet is automatically closed, so that the objects on the object placing table can be protected, and the integrity and the attractiveness of the device are improved.

(2) The driving ring barrel is driven to rotate by the driving assembly, the boss is limited by the driving limiting groove and the guiding limiting groove doubly and moves up and down along the guiding limiting groove, the object placing table can stop at any position in the whole lifting process, and is fixed without shaking after stopping, so that the device is suitable for articles with different heights and has a wide application range;

(3) the lifting mechanism with the protection function has the advantages of compact structure, attractive appearance, strong reliability and wide application range, and can be widely applied to various fields needing to protect products on the object placing table.

Drawings

FIG. 1 is an overall view of the elevating mechanism

FIG. 2 is an overall assembly view of the elevating mechanism

FIG. 3 is a schematic view of a driving assembly of the elevating mechanism

FIG. 4 is a schematic view of a driving ring cylinder structure of the lifting mechanism

FIG. 5 is a schematic view of a supporting frame of the lifting mechanism

FIG. 6 is a schematic view of a supporting frame of the lifting mechanism

FIG. 7 is a schematic view of a structure of a driven ring of the elevating mechanism

FIG. 8 is a schematic view of the front cover structure of the lifting mechanism

FIG. 9 is a schematic view of a lifting mechanism protection sheet

FIG. 10 is a schematic view of the elevating mechanism with the object placing table at the bottom initial position

FIG. 11 is a schematic view of the elevating mechanism with the object placing table elevated to the top position

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is further described in detail below with reference to the accompanying drawings and examples. It should be noted that the implementations not shown or described in the drawings are in a form known to those of ordinary skill in the art. Furthermore, directional terms, such as front, rear, left, right, up, down, front, and back, referred to in the following embodiments are directions only referring to the drawings. Accordingly, the directional terminology is used for purposes of illustration and is in no way limiting.

As shown in fig. 1 to 9, the lifting mechanism with a protection function of the present invention includes a rear cover 10, a driving assembly 9, a fixed cover 8, a platform 7, a driving ring cylinder 6, a support frame 5, a protection assembly, and a front cover 1; the driving assembly 9 is fixed on the rear cover 10 through the fixed cover 8; the bottom of the support frame 5 is fixedly arranged on the rear cover 10;

the driving ring barrel 6 is rotatably arranged in the

support frame

5, 3 spiral driving limiting grooves 61 are formed in the barrel wall of the driving ring barrel 6, and the driving component 9 can drive the driving ring barrel 6 to rotate; the object placing table 7 is arranged inside the driving ring cylinder 6, the object placing table 7 is disc-shaped, 3 cylindrical bosses 71 are uniformly and integrally formed on the periphery of the object placing table 7 in the circumferential direction, the bosses 71 are arranged in the driving limiting groove 61 in a sliding mode, and the driving limiting groove 61 can drive the bosses 71 to move up and down when the driving ring cylinder 6 rotates;

the utility model discloses a safety protection device for automobile, including protecgulum, protecgulum 1 rigid coupling is in 5 tops of support frame, the protection component sets up between protecgulum 1 and support frame 5, the protection component includes 6 protection pieces 2 that can open and shut, can drive when boss 71 goes up and down protection piece 2 opens and shuts.

The fixed cover 8 is fixedly arranged on the rear cover 10 through a buckle; the rear cover 10 is provided with a platform limiting structure 102.

The driving assembly 9 comprises a driving motor 91, a worm 92, a worm wheel 93 and a gear 94, wherein the worm wheel 93 and the gear 94 are fixedly connected or integrally formed and can synchronously rotate around the same rotating shaft, the worm 92 is fixedly arranged on a driving shaft of the driving motor 91, and the worm 92 is meshed with the worm wheel 93.

The driving ring cylinder 6 is a stepped ring cylinder, and has a driving upper cylinder part 601 with a smaller diameter and a driving lower cylinder part 602 with a larger diameter, and the 3 driving limiting grooves 61 are symmetrically arranged on the cylinder wall of the driving upper cylinder part 601 in a penetrating way; a ring gear 62 is provided on the inner peripheral surface of the lower drive cylindrical portion, and the ring gear 62 meshes with the gear 94.

The driving lower cylinder part 602 is provided with an installation groove 63 for assembling the boss 71, the installation groove 63 is connected with the driving limiting groove 61 along the axial direction of the driving ring cylinder 6, and the radial position of the installation groove 63 is arranged within the radial position of the tooth crest of the gear ring 62.

The support frame 5 comprises a support frame lower cylinder part 501 and an annular mounting disc 502 positioned on the periphery of the upper end surface of the support frame lower cylinder part; the top of the support frame 5 is provided with a support frame limiting table 53, the rear cover 10 is provided with a rear cover limiting table 101, and the support frame limiting table 53 and the rear cover limiting table 101 limit the axial movement space of the driving ring cylinder 6, so that the driving ring cylinder is basically kept immovable in the axial direction.

The inner wall of the lower cylinder part 501 of the support frame is uniformly provided with a plurality of driving ring cylinder limiting ribs 54 along the circumferential direction, the outer ends of the driving ring cylinder limiting ribs 54 jointly limit the radial space of the driving ring cylinder 6, the driving ring cylinder 6 rotates in the radial space, and the structure can reduce the friction force applied when the driving ring cylinder 6 rotates.

The inner wall of the lower cylinder part 501 of the support frame is provided with 3 guide limiting grooves 52 in the vertical direction, the boss 71 penetrates through the drive limiting groove 61 and then is in clearance fit with the guide limiting grooves 52, and when the drive ring cylinder 6 rotates, the boss 71 is subjected to double limiting of the drive limiting groove 61 and the guide limiting groove 52 and moves up and down along the guide limiting grooves 52.

A plurality of arc-shaped mounting holes 51 are uniformly formed in the annular mounting disc 502 along the circumferential direction, a limiting sleeve 503 is concentrically and fixedly nested in the lower supporting frame cylinder part 501, and a limiting ring cylinder space 56 is defined by the limiting sleeve 503 and the inner wall of the lower supporting frame cylinder part 501;

the protection assembly further comprises a driven ring 3, wherein the driven ring 3 is provided with a

circular ring structure

35, 3 stress walls 36 are uniformly distributed on the circular ring structure 35 along the axial direction, each stress wall 36 is provided with a straight surface part 33 and an inclined surface part 34 connected with the straight surface part, and the straight surface part 33 is parallel to the central line of the circular ring structure 35; the circular ring structure 35 is uniformly provided with 3 driven

ring mounting points

31 and 6 driven ring tooth parts 32 in the circumferential direction; the force-bearing wall 36 of the driven ring penetrates through the arc-shaped mounting hole 51 to be inserted into the limiting ring cylinder space 56, and when the boss 71 ascends and contacts with the inclined surface part 34, the driven ring 3 can be pushed to rotate;

the guard plate 2 is provided with a blade 21, a mounting hole 22, a guard plate tooth part 23 and a limiting groove 24, the blade 21 is positioned at the upper part of the guard plate tooth part 23, and the bottom of the blade 21 is higher than the upper surface of a circular ring structure 35 of the driven ring, so that interference cannot occur during movement; guard plate 2 rotates through mounting hole 22 and installs on axle 57 on annular mounting disc 502, and guard plate tooth portion 23 meshes with driven ring tooth portion 32, and when driven ring 3 rotated, driven ring tooth portion 32 drive guard plate tooth portion 23 rotatory to drive blade 21 and rotate, realize opening and shutting of guard plate 2.

Protecgulum 1 and annular mounting disc 502 fixed connection, be provided with a plurality of support ribs 59 on the annular mounting disc 502, be provided with the spacing rib 12 of a plurality of protecgulums on the protecgulum 1, the axial space of protection piece 2 is injectd to support rib 59 and the spacing rib 12 of protecgulum, makes protection piece 2 only can be rotary motion along axle 57, and the frictional force that receives is less.

The front cover 1 is provided with a plurality of limiting bosses 11, the limiting bosses 11 penetrate through limiting grooves 24 on the protection sheet 2 to limit the driven ring 3 in the support frame 5, so that the driven ring 3 can only rotate in the support frame 5, and the friction force is small.

The protection assembly further comprises 3 return springs 4, two ends of each return spring 4 are respectively fixed to the annular mounting plate mounting point 58 and the driven ring mounting point 31 and have certain pretension, and the number of the annular mounting plate mounting points 58 is the same as that of the driven ring mounting points 31.

The working process of the lifting mechanism is shown in figures 10-11:

when the object placing table 7 needs to be lifted, the driving motor 91 drives the gear 94 to rotate through the worm 92 and the worm wheel 93, the gear 94 drives the toothed ring 62 to rotate, the driving ring 6 is further driven to move clockwise as shown in fig. 10, and the boss 71 is limited by the dual functions of the guide limiting groove 52 and the drive limiting groove 61, and the object placing table 7 is driven to lift along the guide limiting groove 52.

The ascending process of the object placing table 7 is divided into two parts:

(1) the boss 71 rises and contacts with the inclined surface part 34 to push the driven ring 3 to move anticlockwise as shown in fig. 10, and then the driven ring tooth part 32 drives the protection piece tooth part 23 to rotate, so that the protection piece 2 rotates clockwise along the shaft 57, and when the boss 71 contacts with the straight surface part 33, the protection piece 2 completes the opening process;

(2) then the boss 71 is always contacted with the straight surface part 33, the driven ring 3 is not pushed by the boss 71 any more but pulled by the return spring 4, and the driven ring 3, the guard plate 2 and the return spring 4 maintain a new balance state; the object placing table 7 continues to move upwards and finally reaches the top end of the limiting groove 61 and is limited; in the process, the driving assembly 9 is provided with the worm 92 and the worm wheel 93, so that self-locking can be realized, the object placing table 7 can stably stay at any position, and the flexibility is higher.

The lowering process of the object placing table 7 is opposite to the raising process, and will not be described here.

Although the present invention has been described in detail with reference to the foregoing embodiments, it will be apparent to those skilled in the art that changes may be made in the embodiments and/or equivalents thereof without departing from the spirit and scope of the invention as defined in the following claims. Any modification, equivalent replacement, or improvement made within the spirit and principle of the invention should be included in the protection scope of the invention.

Claims

1. A lifting mechanism with a protection function is characterized by comprising a rear cover (10), a driving assembly (9), a fixed cover (8), an object placing table (7), a driving ring cylinder (6), a support frame (5), a protection assembly and a front cover (1); the driving assembly (9) is fixed on the rear cover (10) through the fixed cover (8); the bottom of the support frame (5) is fixedly arranged on the rear cover (10);

the driving ring barrel (6) is rotatably arranged in the support frame (5), a plurality of spiral driving limiting grooves (61) are formed in the barrel wall of the driving ring barrel, and the driving assembly (9) can drive the driving ring barrel (6) to rotate; the object placing table (7) is arranged inside the driving ring barrel (6), the object placing table (7) is disc-shaped, a plurality of bosses (71) are uniformly distributed on the periphery of the object placing table (7), the number of the bosses (71) is the same as that of the driving limiting grooves (61), the bosses (71) are arranged in the driving limiting grooves (61) in a sliding mode, and the driving limiting grooves (61) can drive the bosses (71) to move up and down when the driving ring barrel (6) rotates;

protecgulum (1) rigid coupling is in support frame (5) top, protection component sets up between protecgulum (1) and support frame (5), protection component includes a plurality of protection pieces (2) that can open and shut, can drive when boss (71) go up and down protection piece (2) open and shut.

2. The lifting mechanism with the protection function according to claim 1, characterized in that: the fixed cover (8) is fixedly arranged on the rear cover (10) in a screw or buckle mode; the rear cover (10) is provided with a storage table limiting structure (102).

3. The lifting mechanism with the protection function according to claim 1, characterized in that: the driving assembly (9) comprises a driving motor (91), a worm (92), a worm wheel (93) and a gear (94), the worm wheel (93) and the gear (94) are fixedly connected or integrally formed and can synchronously rotate around the same rotating shaft, the worm (92) is fixedly arranged on a driving shaft of the driving motor (91), and the worm (92) is meshed with the worm wheel (93).

4. The lifting mechanism with the protection function according to claim 3, characterized in that: the driving ring barrel (6) is a stepped ring barrel, and is provided with a driving upper barrel part (601) with a smaller diameter and a driving lower barrel part (602) with a larger diameter, and the driving limiting grooves (61) are at least 2 in number and symmetrically penetrate through the barrel wall of the driving upper barrel part (601); a gear ring (62) is arranged on the inner circumferential surface of the lower driving barrel part, and the gear ring (62) is meshed with the gear (94).

5. The lifting mechanism with the protection function as claimed in claim 4, wherein: boss (71) are cylindrical, be provided with on section of thick bamboo portion (602) under the drive and be used for the assembly mounting groove (63) of boss (71), mounting groove (63) are connected with drive spacing groove (61) along drive ring section of thick bamboo (6) axis direction, the radial position setting of mounting groove (63) is in within the radial position of ring gear (62) addendum.

6. The lifting mechanism with the protection function according to claim 1, characterized in that: the support frame (5) comprises a support frame lower cylinder part (501) and an annular mounting disc (502) positioned on the periphery of the upper end face of the support frame lower cylinder part; the top of the support frame (5) is provided with a support frame limiting table (53), the rear cover (10) is provided with a rear cover limiting table (101), and the support frame limiting table (53) and the rear cover limiting table (101) limit the axial movement space of the driving ring barrel (6) to enable the axial movement space to be basically kept motionless in the axial direction.

7. The lifting mechanism with the protection function as claimed in claim 6, wherein: the inner wall of the lower cylinder part (501) of the support frame is uniformly provided with a plurality of driving ring cylinder limiting ribs (54) along the circumferential direction, the outer ends of the driving ring cylinder limiting ribs (54) define the radial space of the driving ring cylinder (6) together, and the driving ring cylinder (6) rotates in the radial space.

8. The lifting mechanism with a protection function according to claim 6 or 7, characterized in that: be equipped with guide spacing groove (52) of vertical direction on section of thick bamboo portion (501) inner wall under the support frame, the quantity of guide spacing groove (52) is the same with the quantity of drive spacing groove (61), boss (71) run through behind drive spacing groove (61) with guide spacing groove (52) clearance fit, work as when drive ring section of thick bamboo (6) is rotatory, boss (71) receive the dual spacing of drive spacing groove (61) and guide spacing groove (52) and do elevating movement along guide spacing groove (52).

9. The lifting mechanism with the protection function as claimed in claim 6, wherein: a plurality of arc-shaped mounting holes (51) are uniformly formed in the annular mounting disc (502) along the circumferential direction, a limiting sleeve (503) is fixedly and concentrically nested in the lower supporting frame cylinder part (501), and a limiting ring cylinder space (56) is defined by the limiting sleeve (503) and the inner wall of the lower supporting frame cylinder part (501);

the protection assembly further comprises a driven ring (3), the driven ring (3) is provided with a circular ring structure (35), a plurality of stress walls (36) are uniformly distributed on the circular ring structure (35) along the axial direction, the number of the stress walls (36) is consistent with that of the bosses (71), the stress walls (36) are provided with straight surface parts (33) and inclined surface parts (34) connected with the straight surface parts, and the straight surface parts are parallel to the central line of the circular ring structure (35); a plurality of driven ring mounting points (31) and a plurality of sections of driven ring tooth parts (32) are uniformly arranged on the circumferential direction of the circular ring structure (35); the stress wall (36) of the driven ring penetrates through the arc-shaped mounting hole (51) and is inserted into the limiting ring cylinder space (56), and when the boss (71) rises and is contacted with the inclined surface part (34), the driven ring (3) can be pushed to rotate;

the protective plate (2) is provided with a blade (21), a mounting hole (22), a protective plate tooth part (23) and a limiting groove (24), the blade (21) is positioned at the upper part of the protective plate tooth part (23), and the bottom of the blade (21) is higher than the upper surface of a circular ring structure (35) of the driven ring, so that interference cannot occur during movement; the guard plate (2) is rotatably installed on a shaft (57) on the annular installation disc (502) through the installation hole (22), the guard plate tooth part (23) is meshed with the driven ring tooth part (32), and when the driven ring (3) rotates, the driven ring tooth part (32) drives the guard plate tooth part (23) to rotate, so that the blades (21) are driven to rotate, and the guard plate (2) is opened and closed.

10. The lifting mechanism with the protection function as claimed in claim 9, wherein: the front cover (1) is fixedly connected with the annular mounting disc (502), a plurality of supporting ribs (59) are arranged on the annular mounting disc (502), a plurality of front cover limiting ribs (12) are arranged on the front cover (1), and the supporting ribs (59) and the front cover limiting ribs (12) limit the axial space of the protection sheet (2), so that the protection sheet (2) can only rotate along the shaft (57); the number of the guard plates (2) is the same as the number of the driven ring teeth (32).

11. The lifting mechanism with the protection function as claimed in claim 9, wherein: a plurality of limiting bosses (11) are arranged on the front cover (1), the limiting bosses (11) penetrate through limiting grooves (24) in the protection sheet (2) to limit the driven ring (3) in the support frame (5), and the driven ring (3) can only rotate in the support frame (5).

12. The lifting mechanism with protection function as claimed in claim 10, wherein: the protection assembly further comprises a plurality of elastic resetting pieces (4), two ends of each elastic resetting piece (4) are respectively fixed to the annular mounting plate mounting point (58) and the driven ring mounting point (31) and have certain pretension force, and the number of the annular mounting plate mounting points (58) is the same as that of the driven ring mounting points (31).