CN114455487A

CN114455487A - Template large-span hoisting accessory for construction

Info

Publication number: CN114455487A
Application number: CN202210308826.9A
Authority: CN
Inventors: 常乐天; 何养联; 周炜彬; 梁博; 武铠
Original assignee: Hunan University of Technology
Current assignee: Hunan University of Technology
Priority date: 2022-03-28
Filing date: 2022-03-28
Publication date: 2022-05-10

Abstract

The invention relates to a template large-span hoisting device for building construction, which comprises a base, a steering plate rotationally mounted on the base and a vertical plate rotationally mounted on the steering plate, wherein a first driving motor for driving the steering plate to deflect is mounted on the base, the output end of the first driving motor is connected with a rotating shaft of the steering plate, two groups of thread driving mechanisms for driving the vertical plate to deflect are mounted on the steering plate, a winding mechanism is mounted on the vertical plate, one end of the winding mechanism, far away from the vertical plate, is connected with a mounting frame, the mounting frame is arranged in a U shape, the winding mechanism is mounted on the vertical plate and is connected with the mounting frame, a long plate is fixedly mounted on the mounting frame, and a plurality of hooks are movably arranged at two ends of the long plate through a thread adjusting mechanism, to building templates's fixed convenient and fast, showing and promoting work efficiency, reduced constructor's working strength.

Description

Template large-span hoisting accessory for construction

Technical Field

The invention relates to the related technical field of building construction auxiliary equipment, in particular to a template long-span hoisting device for building construction.

Background

The building template is a building structure of concrete structure type, generally called precast slab, which is directly hoisted, assembled and installed on site by using precast concrete components produced in a modularization way, because the hollow position of the precast slab is not stressed, the concrete is not useful for pouring in the hollow place, and therefore, in the actual production, the unstressed place can be emptied in order to reduce the weight and save the manufacturing cost.

In the construction, carry the prefabricated plate and shift as an indispensable work, now, carrying out this during operation, traditional lifting device will generally adopt wire rope or canvas hoist and mount area to pass the below of prefabricated floor and fix, and it is great to consume time, and hoist and mount operation in-process also appears the unbalanced unstability of prefabricated plate atress easily, collides with, wire rope or canvas area scheduling problem that drops, and the potential safety hazard is great, can not satisfy people's user demand.

Disclosure of Invention

The invention aims to provide a large-span hoisting device for a template for building construction, which aims to solve the problems in the background technology.

In order to achieve the purpose, the invention provides the following technical scheme:

a template large-span hoisting device for building construction comprises a base, a steering plate rotatably mounted on the base and a vertical plate rotatably mounted on the steering plate, wherein a first driving motor for driving the steering plate to deflect is mounted on the base, the output end of the first driving motor is connected with a rotating shaft of the steering plate, and two groups of thread driving mechanisms for driving the vertical plate to deflect are mounted on the steering plate;

the winding mechanism is mounted on the vertical plate, one end, far away from the vertical plate, of the winding mechanism is connected with a mounting frame, the mounting frame is arranged in a U shape, the winding mechanism is mounted on the vertical plate and connected with the mounting frame, a long plate is fixedly mounted on the mounting frame, a plurality of hooks are movably arranged at two ends of the long plate through a thread adjusting mechanism, and the thread adjusting mechanism is mounted on the long plate;

the both sides of long board are respectively rotated and are installed one and are used for carrying out the steadiness piece of bearing to building templates's bottom, and two steadiness piece connection is installed electronic stop gear on the long board.

As a further scheme of the invention: the screw thread adjustment mechanism is installed including rotating two-way lead screw, the slip cover on the long slab are established two expansion plates and two screwed pipes of fixed mounting on two expansion plates on the long slab both ends, the both ends of two-way lead screw stretch into respectively to two in the screwed pipe, just two-way lead screw with screwed pipe threaded connection, two-way lead screw is still connected and is set up power spare on the mounting bracket.

As a still further scheme of the invention: the expansion plate is kept away from one of mounting bracket serves fixed mounting have a fixed plate, and is a plurality of couple fixed mounting is in the fixed plate orientation one side of mounting bracket, and is a plurality of couple equidistance sets up, the power part is including setting up fourth driving motor on the mounting bracket, fourth driving motor's output shaft pass through bevel gear group with two-way lead screw is connected.

As a still further scheme of the invention: the long plate is fixedly provided with two elastic pieces, the two ends of each elastic piece are respectively fixed to the stabilizing piece, the electric limiting mechanism is installed on the long plate and located two electric telescopic rods between the elastic pieces, the movable end of each electric telescopic rod is provided with a pulley, and the pulleys are connected with the stabilizing piece in an abutting mode.

As a still further scheme of the invention: transverse plates are fixedly mounted at one end of the vertical plate, which is far away from the steering plate, a gap is reserved between the two transverse plates, and two side plates are fixedly mounted on two sides of the vertical plate respectively;

the winding mechanism comprises a cable roller and a transition wheel, wherein the cable roller is rotatably arranged between two side plates, the transition wheel is rotatably arranged between the two side plates, one side of the transition wheel is provided with a third driving motor, the output end of the third driving motor is connected with the rotating shaft of the cable roller, a cable is wound on the cable roller and is connected with the mounting frame through the two transition wheels and a traction hook.

As a still further scheme of the invention: the screw thread driving mechanism comprises a translation assembly arranged on the steering plate and a driven assembly connected with the translation assembly and the vertical plate rotating shaft, and the driven assembly is triggered in the process of movement of the translation assembly to enable the vertical plate to deflect.

As a still further scheme of the invention: symmetry fixed mounting has two vertically risers with it on the deflector, the translation subassembly is installed two including rotating one-way lead screw between the riser and setting are in threading board on the one-way lead screw, one of them the installation of riser lateral part second driving motor, second driving motor's output with one-way lead screw is connected, the threading board with one-way lead screw threaded connection, a plurality of with are still installed to the lateral part of threading board the leading wheel of deflector contact.

As a still further scheme of the invention: the driven assembly comprises a gear fixedly mounted on the vertical plate rotating shaft and a plurality of teeth fixedly arranged on the threaded plate, the teeth are arranged on the threaded plate at equal intervals, and the gear is meshed with the teeth.

Compared with the prior art, the invention has the beneficial effects that: the invention has novel design, through the mutual matching of each mechanism and components in the device, because the fourth driving motor can enable the two expansion plates to slide towards or away from the mounting rack on the long plate when driving the bidirectional screw rod to rotate, the distance between the hooks on the two expansion plates is reduced or increased, and finally the hooks can be adjusted to the through holes at the two ends of the building template, thus realizing the lifting of the building templates with different lengths, and after the building template is lifted to a certain height, the electric limiting mechanism can drive the two stable pieces to simultaneously rotate towards the bottom of the building template, finally, the two stable pieces can effectively support the bottom of the building template, ensure the stability of the building template in the lifting process, improve the safety of construction, and when the device is used, the fixing of the building template is convenient and fast, and the working efficiency is obviously improved, the working strength of constructors is reduced.

Drawings

FIG. 1 is an isometric view of one embodiment of a formwork long-span lifting apparatus for building construction.

Fig. 2 is a schematic structural diagram of an embodiment of a formwork large-span hoisting device for building construction.

Fig. 3 is another angle structure diagram of an embodiment of the template large-span hoisting device for building construction.

Fig. 4 is a schematic structural view of another angle of an embodiment of a formwork large-span hoisting device for building construction.

Fig. 5 is an enlarged view of a structure at a in fig. 2.

Fig. 6 is an enlarged view of the structure at B in fig. 4.

FIG. 7 is an exploded view of the structure of a thread adjusting mechanism in an embodiment of the formwork large-span hoisting device for building construction.

In the figure: 1. a base; 2. a steering plate; 3. a vertical plate; 4. a transverse plate; 5. a transition wheel; 6. a cable roller; 7. a cable; 8. a towing hook; 9. a mounting frame; 10. hooking; 11. a long plate; 12. a retractable plate; 13. a bidirectional screw rod; 14. a threaded pipe; 15. a bevel gear set; 16. a fixing plate; 17. a stabilizing member; 18. an elastic sheet; 19. an electric telescopic rod; 20. a pulley; 21. a first drive motor; 22. a second drive motor; 23. a third drive motor; 24. a fourth drive motor; 25. a vertical plate; 26. a one-way screw rod; 27. a thread plate; 28. a guide wheel; 29. a gear; 30. a connecting plate; 31. a support plate; 32. a side plate; 33. a transmission belt.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the 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 invention.

In addition, an element of the present invention may be said to be "fixed" or "disposed" to another element, either directly on the other element or with intervening elements present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. The terms "vertical," "horizontal," "left," "right," and the like as used herein are for illustrative purposes only and do not represent the only embodiments.

Referring to fig. 1 to 7, in an embodiment of the present invention, a formwork long-span hoisting device for building construction includes a base 1, a steering plate 2 rotatably mounted on the base 1, and a vertical plate 3 rotatably mounted on the steering plate 2. Specifically, two connecting plates 30 are fixedly mounted on the steering plate 2, a gap is reserved between the two connecting plates 30, and the vertical plate 3 is rotatably mounted in the gap.

It should be added that the lateral part of the base 1 is also provided with a plurality of travelling wheels for the device to move, in actual use, a corresponding cab can be arranged on the base 1, and constructors can control the work of each mechanism in the cab, so that the construction formwork transportation and carrying work is facilitated.

The base 1 is provided with a first driving motor 21 for driving the steering plate 2 to deflect, the output end of the first driving motor 21 is connected with the rotating shaft of the steering plate 2, and the steering plate 2 is provided with two groups of thread driving mechanisms for driving the vertical plate 3 to deflect.

Referring to fig. 1 and 2 again, the screw driving mechanism includes a translation assembly mounted on the steering plate 2 and a driven assembly connecting the translation assembly and the rotating shaft of the vertical plate 3, and the driven assembly is triggered during the movement of the translation assembly to deflect the vertical plate 3.

Symmetry fixed mounting has two vertically risers 25 with it on the deflector 2, the translation subassembly is installed two including rotating one-way lead screw 26 between the riser 25 and setting are in threading board 27 on the one-way lead screw 26, one of them the installation of riser 25 lateral part has second driving motor 22, second driving motor 22's output with one-way lead screw 26 is connected, threading board 27 with one-way lead screw 26 threaded connection, threading board 27's lateral part still install a plurality of with the leading wheel 28 of deflector 2 contact.

Further, a through hole for the unidirectional screw rod 26 to pass through is formed in the thread plate 27, and a thread engaged with the unidirectional screw rod 26 is formed on the inner wall of the through hole.

It should be noted that the unidirectional screw rods 26 on the translation assemblies in the two sets of screw driving mechanisms are connected through a transmission belt 33, so that the movement of the two sets of screw driving mechanisms is synchronous when the second driving motor 22 works.

The driven assembly comprises a gear 29 fixedly arranged on a rotating shaft of the vertical plate 3 and a plurality of teeth fixedly arranged on the thread plate 27, the teeth are arranged on the thread plate 27 at equal intervals, and the gear 29 is meshed with the teeth.

When the second driving motor 22 works, the one-way screw rod 26 is driven to rotate, the guide wheel 28 guides the screw plate 27 to generate a force watermelon, so that the screw plate 27 moves on the one-way screw rod 26, when the screw plate 27 moves towards the second driving motor 22, the teeth on the screw plate drive the vertical plate 3 to deflect upwards in the vertical direction, otherwise, when the screw plate 27 moves towards the direction far away from the second driving motor 22, the vertical plate 3 deflects downwards in the vertical direction, correspondingly, finally, the distance between the falling position of the building template and the base 1 becomes smaller or larger, because the building template is lifted and the steering plate 2 rotates to change the direction of the building template, if the falling distance of the building template needs to be adjusted, the device is inconvenient to move, and therefore, the screw driving mechanism is arranged, so that the vertical plate 3 has a rotatable function, the adjusting function of the distance between the final falling position of the building template and the base 1 is realized, the practicability of the device is greatly improved, and convenience is further brought to the lifting work of the building template.

The vertical plate 3 is provided with a winding mechanism, one end, far away from the vertical plate 3, of the winding mechanism is connected with a mounting frame 9, the mounting frame 9 is in a U-shaped shape, the winding mechanism is installed on the vertical plate 3 and connected with the mounting frame 9, a long plate 11 is fixedly installed on the mounting frame 9, two ends of the long plate 11 are movably provided with a plurality of hooks 10 through a thread adjusting mechanism, and the thread adjusting mechanism is installed on the long plate 11.

Referring to fig. 7 again, the thread adjusting mechanism includes a bidirectional screw 13 rotatably mounted on the long plate 11, two expansion plates 12 slidably sleeved on two ends of the long plate 11, and two threaded pipes 14 fixedly mounted on the two expansion plates 12. The two ends of the bidirectional screw rod 13 extend into the two threaded pipes 14 respectively, the bidirectional screw rod 13 is in threaded connection with the threaded pipes 14, and the bidirectional screw rod 13 is further connected with a power part arranged on the mounting rack 9.

Further, two sections of threads are symmetrically arranged on the bidirectional screw rod 13, the turning directions of the two sections of threads are opposite, and the inner wall of the threaded pipe 14 is provided with threads engaged with the bidirectional screw rod 13.

The expansion plate 12 is kept away from one of mounting bracket 9 serves fixed mounting and is served fixed mounting and have a fixed plate 16, and is a plurality of couple 10 fixed mounting is in fixed plate 16 orientation one side of mounting bracket 9, and is a plurality of couple 10 equidistance sets up. The power part comprises a fourth driving motor 24 arranged on the mounting frame 9, and an output shaft of the fourth driving motor 24 is connected with the bidirectional screw rod 13 through a bevel gear set 15.

Specifically, the bevel gear set 15 includes a first bevel gear fixedly mounted on the end of the output shaft of the fourth driving motor 24 and a second bevel gear fixedly mounted on the bidirectional screw 13, and the second bevel gear is engaged with the first bevel gear.

When the device is used, the device moves to a proper lifting position, the first driving motor 21 works to drive the steering plate 2 to rotate until the hook 10 deflects to a proper lifting position, then the winding mechanism works to reduce the height of the hook 10 to a position with the same height as a building template to be conveyed, the fourth driving motor 24 works to drive the bidirectional screw rod 13 to rotate, so that the two threaded pipes 14 are simultaneously in threaded fit with the bidirectional screw rod 13 and move close to or away from each other, correspondingly, the two expansion plates 12 slide towards or away from the mounting frame 9 on the long plate 11, the distance between the hooks 10 on the two expansion plates 12 is reduced or increased, and therefore, the hooks 10 can be adjusted into through holes at two ends of the building template, and then the winding mechanism works again to pull and lift the building template, and after the building template has a certain height from the ground, the electric limiting mechanism works to enable the two stable pieces 17 to rotate towards the bottom of the building template at the same time, and finally, the two stable pieces 17 can effectively support the bottom of the building template, so that the stability of the building template in the hoisting process is ensured, and the construction safety is improved;

along with the rotation of first driving motor 21 drive deflector 2, can adjust the building templates to final whereabouts position, screw drive mechanism work will drive riser 3 and rotate, and then, the distance of adjustable final building templates whereabouts position has avoided need carrying out the problem that removes to the device when placing the building templates, prevents that the device from removing the in-process, and the building templates produces violent rocking and causes the potential safety hazard.

The two sides of the long plate 11 are respectively rotatably provided with a stable part 17 used for supporting the bottom of the building template, the stable part 17 is arranged in an L-shaped structure, and the two stable parts 17 are connected and installed on the electric limiting mechanism on the long plate 11.

Referring to fig. 6 again, two elastic pieces 18 are further fixedly mounted on the long plate 11, two ends of each elastic piece 18 are respectively fixed to the two fixing members 17, the electric limiting mechanism includes two electric telescopic rods 19 mounted on the long plate 11 and located between the two elastic pieces 18, a pulley 20 is mounted at a movable end of each electric telescopic rod 19, and the pulley 20 abuts against the fixing members 17.

When carrying out couple 10 and building templates's being connected, electric telescopic handle 19's expansion end extends, the flexure strip 18 takes place to deform, make two steadies 17 rotate simultaneously and expand, after building templates is lifted by crane to a take the altitude, electric telescopic handle 19 contracts again, flexure strip 18 carries out elastic response and makes two steadies 17 rotate towards building templates's bottom simultaneously, then, two steadies 17 just play effectual supporting role to building templates's bottom, the stability of the in-process building templates of lifting by crane is improved.

Referring to fig. 1 again, a transverse plate 4 is fixedly installed on one end of the vertical plate 3 away from the steering plate 2, a gap is reserved between the two transverse plates 4, and a side plate 32 is fixedly installed on each of two sides of the vertical plate 3. The winding and collecting mechanism comprises a cable roller 6 rotatably arranged between the two side plates 32 and a transition wheel 5 rotatably arranged between the two transverse plates 4, wherein a third driving motor 23 is further arranged on one side plate 32, and the output end of the third driving motor 23 is connected with a rotating shaft of the cable roller 6;

the cable 7 is wound on the cable roller 6, and the cable 7 is connected with the mounting rack 9 through the two transition wheels 5 and the towing hook 8.

It should be added that, a supporting plate 31 is further fixed on the vertical plate 3, the supporting plate 31 is disposed in an inclined manner, and one end of the supporting plate 31, which is far away from the vertical plate 3, is fixed to the two horizontal plates 4 so as to stabilize the two horizontal plates 4.

When the third driving motor 23 drives the cable roller 6 to rotate towards one side, the cable roller 6 winds the cable 7, then the two transition wheels 5 guide the cable 7, so that the cable 7 is pulled upwards by the pulling hook 8 to the mounting frame 9, and the building formwork is lifted, and conversely, when the third driving motor 23 drives the cable roller 6 to rotate towards the other side, the cable roller 6 releases the cable 7, and the height of the building formwork is lowered.

The working principle of the invention is as follows: when the device is used, the device moves to a proper lifting position, the first driving motor 21 works to drive the steering plate 2 to rotate until the hook 10 deflects to a proper lifting position, the fourth driving motor 24 works to drive the bidirectional screw rod 13 to rotate, so that the two threaded pipes 14 are simultaneously in threaded fit with the bidirectional screw rod 13 and move close to or away from each other, correspondingly, the two telescopic plates 12 slide on the long plate 11 towards or away from the mounting frame 9, the distance between the hooks 10 on the two telescopic plates 12 is reduced or increased, and therefore the hook 10 can be adjusted to the through holes at two ends of the building template;

when the hook 10 is connected with the building template, the movable end of the electric telescopic rod 19 extends, the elastic sheet 18 deforms, so that the two stable pieces 17 rotate and expand simultaneously, after the building template is lifted to a certain height, the electric telescopic rod 19 contracts again, the elastic sheet 18 elastically returns to enable the two stable pieces 17 to rotate towards the bottom of the building template simultaneously, and therefore the two stable pieces 17 can effectively support the bottom of the building template, and the stability of the building template in the lifting process is improved;

when the third driving motor 23 drives the cable roller 6 to rotate towards one side, the cable roller 6 winds the cable 7, so that the two transition wheels 5 guide the cable 7, the cable 7 is pulled upwards by the pulling hook 8 to the mounting frame 9, the building formwork is lifted, and conversely, when the third driving motor 23 drives the cable roller 6 to rotate towards the other side, the cable roller 6 releases the cable 7, and the height of the building formwork is lowered;

It will be evident to those skilled in the art that the invention is not limited to the details of the foregoing illustrative embodiments, and that the present invention may be embodied in other specific forms without departing from the spirit or essential attributes thereof. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. Any reference sign in a claim should not be construed as limiting the claim concerned.

Furthermore, it should be understood that although the present description refers to embodiments, not every embodiment may contain only a single embodiment, and such description is for clarity only, and those skilled in the art should integrate the description, and the embodiments may be combined as appropriate to form other embodiments understood by those skilled in the art.

Claims

1. The large-span hoisting device for the template for building construction is characterized by comprising a base (1), a steering plate (2) rotatably mounted on the base (1) and a vertical plate (3) rotatably mounted on the steering plate (2);

a first driving motor (21) for driving the steering plate (2) to deflect is mounted on the base (1), the output end of the first driving motor (21) is connected with a rotating shaft of the steering plate (2), and two groups of thread driving mechanisms for driving the vertical plate (3) to deflect are mounted on the steering plate (2);

a winding mechanism is mounted on the vertical plate (3), one end, far away from the vertical plate (3), of the winding mechanism is connected with a mounting frame (9), the mounting frame (9) is arranged in a U shape, the winding mechanism is mounted on the vertical plate (3) and connected with the mounting frame (9), a long plate (11) is fixedly mounted on the mounting frame (9), a plurality of hooks (10) are movably arranged at two ends of the long plate (11) through a thread adjusting mechanism, and the thread adjusting mechanism is mounted on the long plate (11);

the two sides of the long plate (11) are respectively rotatably provided with a fixing piece (17) used for supporting the bottom of the building template, and the fixing pieces (17) are connected and arranged on an electric limiting mechanism on the long plate (11).

2. The formwork long-span hoisting device for building construction according to claim 1, wherein the thread adjusting mechanism comprises a bidirectional screw rod (13) rotatably mounted on the long plate (11), two expansion plates (12) slidably sleeved on two ends of the long plate (11), and two threaded pipes (14) fixedly mounted on the two expansion plates (12);

the two ends of the bidirectional screw rod (13) extend into the two threaded pipes (14) respectively, the bidirectional screw rod (13) is in threaded connection with the threaded pipes (14), and the bidirectional screw rod (13) is further connected with a power part arranged on the mounting rack (9).

3. The formwork long-span hoisting device for building construction is characterized in that a fixing plate (16) is fixedly installed on one end, far away from the mounting frame (9), of the expansion plate (12), a plurality of hooks (10) are fixedly installed on one side, facing the mounting frame (9), of the fixing plate (16), and the hooks (10) are arranged at equal intervals;

the power part comprises a fourth driving motor (24) arranged on the mounting rack (9), and an output shaft of the fourth driving motor (24) is connected with the bidirectional screw rod (13) through a bevel gear set (15).

4. The formwork long-span hoisting device for building construction according to claim 1, wherein two elastic pieces (18) are further fixedly mounted on the long plate (11), two ends of each elastic piece (18) are respectively fixed to the two steady members (17), the electric limiting mechanism comprises two electric telescopic rods (19) mounted on the long plate (11) and located between the two elastic pieces (18), a pulley (20) is mounted at a movable end of each electric telescopic rod (19), and the pulley (20) abuts against the steady members (17).

5. The formwork long-span hoisting device for building construction according to claim 1, wherein a transverse plate (4) is fixedly mounted on one end of the vertical plate (3) far away from the steering plate (2), a gap is reserved between the two transverse plates (4), and two side plates (32) are fixedly mounted on two sides of the vertical plate (3) respectively;

the winding and collecting mechanism comprises a cable roller (6) rotatably installed between two side plates (32) and a transition wheel (5) rotatably installed between two transverse plates (4), wherein a third driving motor (23) is further installed on one side plate (32), and the output end of the third driving motor (23) is connected with a rotating shaft of the cable roller (6);

and a cable (7) is wound on the cable roller (6), and the cable (7) is connected with the mounting frame (9) through the two transition wheels (5) and the traction hook (8).

6. The formwork long-span hoisting device for building construction according to claim 1, wherein the screw driving mechanism comprises a translation assembly mounted on the steering plate (2) and a driven assembly connecting the translation assembly and a rotating shaft of the vertical plate (3), and the driven assembly is triggered during the movement of the translation assembly to deflect the vertical plate (3).

7. The formwork large-span hoisting device for building construction according to claim 6, wherein two vertical plates (25) perpendicular to the steering plate (2) are symmetrically and fixedly mounted on the steering plate, the translation assembly comprises a one-way screw rod (26) rotatably mounted between the two vertical plates (25) and a thread plate (27) arranged on the one-way screw rod (26), a second driving motor (22) is mounted on one side of one of the vertical plates (25), an output end of the second driving motor (22) is connected with the one-way screw rod (26), the thread plate (27) is in threaded connection with the one-way screw rod (26), and a plurality of guide wheels (28) in contact with the steering plate (2) are further mounted on the side of the thread plate (27).

8. The formwork long-span hoisting device for building construction according to claim 7, wherein the driven assembly comprises a gear (29) fixedly mounted on the rotating shaft of the vertical plate (3) and a plurality of teeth fixedly arranged on the threaded plate (27), the plurality of teeth are equidistantly arranged on the threaded plate (27), and the gear (29) is meshed with the teeth.