阅读说明：本技术 一种一次性附墙顶升机构及方法 (Disposable wall-attached jacking mechanism and method ) 是由 何卫东 徐栋 瞿晶亮 朱正明 郭凯 于 2021-09-10 设计创作，主要内容包括：本发明提出了一种一次性附墙顶升机构及方法,通过设置电机和丝杆螺母机构,通过丝杆螺母机构传动,交替顶升驱动平台和轨道立柱,配合第一挂钩、第一挂杆,以及第二挂钩和第二挂杆的设计,一次就能顶升一个楼层,无需设置换向装置,更加高效,配合链轮传动,传动效率更高；设置圆管和翼缘板组成的轨道立柱,其结构简单、加工方便、成本更低；采用圆管结构的轨道立柱,不便于在表面打孔,依次采用挂钩设计,配合附墙座上的斜槽设计,可进行避位处理,起到防坠作用；在驱动平台上两伸缩支撑腿,当顶升轨道立柱时,可以起到支撑受力的作用,同时将限位滑块推离轨道立柱,减小二者之间的摩擦。(The invention provides a one-time wall-attached jacking mechanism and a method, wherein a motor and a screw rod nut mechanism are arranged, a driving platform and a rail upright post are alternatively jacked through the transmission of the screw rod nut mechanism, and a first hook, a first hanging rod, a second hook and a second hanging rod are matched, so that one floor can be jacked at one time, a reversing device is not required to be arranged, the efficiency is higher, the transmission is higher through the transmission of a chain wheel; the rail upright post consisting of the circular tube and the flange plate is arranged, so that the structure is simple, the processing is convenient, and the cost is lower; the rail upright post with the circular tube structure is inconvenient to punch on the surface, and the hook design is adopted in sequence and matched with the chute design on the wall-attached seat, so that the avoiding treatment can be carried out, and the anti-falling effect is achieved; two telescopic support legs on drive platform when jacking track stand, can play the effect of supporting the atress, push away limit slide from the track stand simultaneously, reduce the friction between the two.)

1. The utility model provides a disposable wall climbing mechanism that attaches, it includes at least three wall seat (1), drive platform (3) and track stand (4), wherein, drive platform (3) and track stand (4) are at vertical direction sliding connection, follow vertical direction on track stand (4), the orientation attaches wall seat (1) one side and is provided with a plurality of first couples (41), be provided with second couple (31) on drive platform (3), it includes base (11) to attach wall seat (1), first peg (12) and second peg (13), hang on first peg (12) of first couple (41) selectivity, hang on second peg (13) of second couple (31) selectivity, its characterized in that: the wall is characterized by also comprising a motor (2) and a screw rod nut mechanism (5), wherein three bases (11) are arranged on the surface of the wall at equal intervals along the vertical direction, and the interval between every two adjacent bases (11) is the height of one floor; the feed screw nut mechanism (5) comprises a feed screw (51) and a feed screw nut (52), one end of the feed screw (51) is hinged with the rail upright post (4), the other end of the feed screw nut is connected with the feed screw nut (52), the feed screw nut (52) is rotatably connected with the driving platform (3), and the motor (2) is fixed on the driving platform (3) and drives the feed screw nut (52) to rotate forwards or backwards.

2. The disposable wall-attached jacking mechanism of claim 1, wherein: the rail upright post (4) comprises a circular tube (42) and a flange plate (43), the circular tube (42) is vertically arranged and connected with the operation platform, the flange plate (43) is fixed on the side surface of the circular tube (42), and a plurality of first hooks (41) are arranged on the side surface of the flange plate (43) along the vertical direction.

3. The disposable wall-attached jacking mechanism of claim 2, wherein: the wall attaching base (1) further comprises two guide blocks (14), the guide blocks (14) are fixed relative to the base (11) and are in sliding connection with the flange plates (43), and the flange plates (43) are encircled from the outer sides by the guide blocks (14).

4. The disposable wall-attached jacking mechanism of claim 2, wherein: the wall attaching seat (1) further comprises two first supporting plates (15) which are oppositely arranged on the surface of the base (11), inclined grooves (16) are oppositely and parallelly formed in the surfaces of the two first supporting plates (15), the first hanging rod (12) moves along the inclined grooves (16), the lowest points of the inclined grooves (16) are located on the stroke of the first hook (41) moving in the vertical direction, and the highest points of the inclined grooves (16) are located outside the stroke of the first hook (41) moving in the vertical direction.

5. The disposable wall-attached jacking mechanism of claim 2, wherein: drive platform (3) are including platform body (32) and two telescopic support leg (33), platform body (32) are fixed and with screw-nut (52) rotatable coupling with motor (2), second couple (31) and telescopic support leg (33) set up in the orientation and attach one side of wall seat (1), and two telescopic support leg (33) are selective to support and hold on the wall surface.

6. The disposable wall-attached jacking mechanism of claim 5, wherein: the driving platform (3) comprises two limiting sliding blocks (34) which are fixed relatively to the platform body (32) and are respectively arranged on two sides of the circular tube (42) and are in sliding connection with the circular tube.

7. The disposable wall-attached jacking mechanism of claim 6, wherein: the contact surface of the limiting slide blocks (34) and the circular tube (42) is an inner arc surface, and the contact surfaces of the two limiting slide blocks (34) and the circular tube (42) are positioned on the semi-cylindrical surface of one side, close to the platform body (32), of the circular tube (42).

8. The disposable wall-attached jacking mechanism of claim 1, wherein: the device also comprises a transmission mechanism (6) which comprises a first chain wheel (61), a first deep groove ball bearing (62), a second deep groove ball bearing (63), an upper bearing seat (64), a lower bearing seat (65) and a chain (66), wherein the number of the lead screw nuts (52) is two, one of the chain wheel is a chain wheel (521), the other is a lower lead screw nut (522), an upper bearing seat (64) and a lower bearing seat (65) are respectively fixed at the upper part and the lower part of the driving platform (3), a first deep groove ball bearing (62) and a second deep groove ball bearing (63) are respectively fixed in the upper bearing seat (64) and the lower bearing seat (65), a first chain wheel (61) is fixed with an output shaft of the motor (2), the chain wheel (521) is in threaded connection with a lead screw (51) and is in transmission connection with the first chain wheel (61) through a chain (66), the chain wheel (521) is fixed with the first deep groove ball bearing (62), and the lower lead screw nut (522) is in threaded connection with the lead screw (51) and is fixed with the second deep groove ball bearing (63).

9. The disposable wall-attached jacking mechanism of claim 8, wherein: the transmission mechanism (6) further comprises a first conical roller bearing (68) and a second conical roller bearing (67), the first conical roller bearing (68) and the second conical roller bearing (67) are respectively fixed in the upper bearing seat (64) and the lower bearing seat (65), and the chain wheel (521) and the lower lead screw nut (522) are respectively fixed with the first conical roller bearing (68) and the second conical roller bearing (67).

10. A disposable wall-attached jacking method is characterized in that: the wall-attached jacking mechanism adopted by the method of claims 1 to 9 comprises the following steps,

s1, in an initial state, a first hook (41) is hung on a first hanging rod (12), and a second hook (31) is hung on a second hanging rod (13);

s2, the motor (2) rotates forwards, the rail upright post (4) is conducted and driven to ascend by one floor through the screw rod nut mechanism (5), and the first hook (41) of the rail upright post (4) ascends by one floor and then is hung on the first hanging rod (12) of the previous wall-attached base (1);

s3, the motor (2) rotates reversely, the driving platform (3) is conducted and jacked up to rise by a floor height through the screw rod nut mechanism (5), and the second hook (31) of the driving platform (3) rises by a floor and then is hung on the second hanging rod (13) of the previous wall base (1) to complete jacking operation of the floor.

Technical Field

The invention relates to the field of building construction, in particular to a one-time wall-attached jacking mechanism and a method.

Background

Traditional high-rise building construction platform generally calls as climbing frame or scaffold frame, through climbing mechanism, and the drive stores pylon rises, and constructor carries out the construction operation on the stores pylon.

Along with the rapid rising of labor cost in recent years, the building industry also faces the situation of insufficient human resources, so the concept of the building machine is proposed, a large-scale operation platform is arranged at the top of a traditional climbing frame or a scaffold, the large-scale operation platform and the hanging frame are driven to rise through a jacking mechanism, and the automation equipment carried on the large-scale operation platform and the hanging frame is used for rapid construction and reducing the requirement of human resources.

Chinese patent CN111219055A provides a light-duty high-efficiency construction building device capable of transferring, which comprises hanging seats, a driving platform, a hydraulic cylinder, an upper reversing box, a lower reversing box and a rail upright post, wherein a plurality of hanging seats are fixed outside an outer wall shear wall, the driving platform is in sliding fit with the rail upright post, the lower reversing box is fixed at the upper end of the driving platform, the hydraulic cylinder is connected with the upper reversing box and the lower reversing box, and the upper reversing box is in sliding connection with the rail upright post. Wherein, the hydraulic cylinder adopts the hydraulic cylinder of little stroke. When climbing operation is carried out, the upper reversing box and the lower reversing box are hung at the bottom of the rail upright post window lattice hole or are jacked at the top of the rail upright post window lattice hole, and the upper reversing box and the lower reversing box reciprocate to realize jacking of the rail upright post or lifting of the driving platform. The above mode is through last switching-over box and lower switching-over box reciprocating motion to need frequently to carry out the locking of last switching-over box and lower switching-over box and track stand and remove locking operation, very loaded down with trivial details, and can only climb a stroke of little stroke pneumatic cylinder at most once, just can be with the height of a floor with large-scale work platform and stores pylon jacking through climbing many times, inefficiency.

Disclosure of Invention

In view of the above, the present invention provides a one-time wall-attached jacking mechanism and method, which can jack up one floor height at a time.

The technical scheme of the invention is realized as follows:

on one hand, the invention provides a disposable wall-attached jacking mechanism which comprises at least three wall-attached seats, a driving platform and a rail upright post, wherein the driving platform and the rail upright post are connected in a sliding manner in the vertical direction; the feed screw nut mechanism comprises a feed screw and a feed screw nut, one end of the feed screw is hinged with the rail upright column, the other end of the feed screw is connected with the feed screw nut, the feed screw nut is rotatably connected with the driving platform, and the motor is fixed on the driving platform and drives the feed screw nut to rotate forwards or reversely.

On the basis of above technical scheme, it is preferred, the track stand includes pipe and flange board, and the operation platform is just connected to the vertical setting of pipe, and the flange board is fixed in the pipe side, and the flange board side is provided with a plurality of first couples along the vertical direction.

Further preferably, the wall attaching base further comprises two guide blocks, the guide blocks are fixed relative to the base and are in sliding connection with the flange plate, and the flange plate is surrounded by the guide blocks from the outer side.

Preferably, the wall-attached seat further comprises two first supporting plates which are oppositely arranged on the surface of the base, inclined grooves are oppositely and parallelly formed in the surfaces of the two first supporting plates, the first hanging rod moves along the inclined grooves, the lowest points of the inclined grooves are located on the stroke of the first hooks moving in the vertical direction, and the highest points of the inclined grooves are located outside the stroke of the first hooks moving in the vertical direction.

Further preferably, the driving platform comprises a platform body and two telescopic supporting legs, the platform body is fixed with the motor and is rotatably connected with the screw rod nut, the second hook and the telescopic supporting legs are arranged on one side facing the wall base, and the two telescopic supporting legs are selectively abutted to the surface of the wall body.

Preferably, the driving platform includes two limiting sliding blocks, which are fixed relatively to the platform body, respectively disposed on two sides of the circular tube, and slidably connected to the circular tube.

Still further preferably, the contact surface of the limiting slide block and the circular tube is an inner arc surface, and the contact surfaces of the two limiting slide blocks and the circular tube are positioned on the semi-cylindrical surface of one side, close to the platform body, of the circular tube.

On the basis of the technical scheme, the driving mechanism is preferably further included and comprises a first chain wheel, a first deep groove ball bearing, a second deep groove ball bearing, an upper bearing seat, a lower bearing seat and a chain, the number of the lead screw nuts is two, one of the two is a chain wheel, the other one is a lower lead screw nut, the upper bearing seat and the lower bearing seat are respectively fixed on the upper portion and the lower portion of the driving platform, the first deep groove ball bearing and the second deep groove ball bearing are respectively fixed in the upper bearing seat and the lower bearing seat, the first chain wheel is fixed with the output shaft of the motor, the chain wheel is in threaded connection with the lead screw and is in chain transmission connection with the first chain wheel, the chain wheel is fixed with the first deep groove ball bearing, and the lower lead screw nut is in threaded connection with the lead screw and is fixed with the second deep groove ball bearing.

Preferably, the transmission mechanism further comprises a first conical roller bearing and a second conical roller bearing, the first conical roller bearing and the second conical roller bearing are respectively fixed in the upper bearing seat and the lower bearing seat, and the chain wheel and the lower lead screw nut are respectively fixed with the first conical roller bearing and the second conical roller bearing.

In a second aspect, a one-time wall-attached jacking method, which adopts the wall-attached jacking mechanism of the first aspect of the invention, comprises the following steps,

s1, in an initial state, a first hook is hung on the first hanging rod, and a second hook is hung on the second hanging rod;

s2, the motor rotates forwards, the rail upright post is conducted and driven to rise by one floor through the screw rod nut mechanism, and the first hook of the rail upright post rises by one floor and then is hung on the first hanging rod of the upper wall-attached base;

and S3, reversing the motor, conducting and jacking the driving platform to move by a floor height through the screw rod and nut mechanism, and hanging a second hook of the driving platform on a second hanging rod attached to the wall base after the second hook of the driving platform rises by a floor to finish the jacking operation of a floor.

Compared with the prior art, the disposable wall-attached jacking mechanism and the method have the following beneficial effects:

(1) by arranging the motor and the screw rod nut mechanism, the driving platform and the rail upright post are alternatively jacked up through the transmission of the screw rod nut mechanism, and one floor can be jacked up at one time by matching with the design of the first hook, the first hanging rod, the second hook and the second hanging rod, a reversing device is not required to be arranged, the efficiency is higher, the transmission is matched with the chain wheel transmission, and the transmission efficiency is higher;

(2) the rail upright post consisting of the circular tube and the flange plate is arranged, so that the structure is simple, the processing is convenient, and the cost is lower;

(3) the rail upright post with the circular tube structure is inconvenient to punch on the surface, and the hook design is adopted in sequence and matched with the chute design on the wall-attached seat, so that the avoiding treatment can be carried out, and the anti-falling effect is achieved;

(4) two telescopic support legs on drive platform when jacking track stand, can play the effect of supporting the atress, push away limit slide from the track stand simultaneously, reduce the friction between the two.

Drawings

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, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.

FIG. 1 is a perspective view of a wall attachment jacking mechanism of the present invention;

FIG. 2 is a perspective view of the wall attachment base of the present invention;

FIG. 3 is a perspective view of the drive platform of the present invention;

FIG. 4 is a top view of the drive platform of the present invention;

FIG. 5 is a perspective view of the rail upright of the present invention;

FIG. 6 is a perspective view of the rail upright of the present invention;

figure 7 is an elevational, cross-sectional view of the feed screw-nut mechanism portion of the present invention.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to 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 obtained by a person skilled in the art without any inventive step based on the embodiments of the present invention, are within the scope of the present invention.

As shown in fig. 1, the disposable wall-attached jacking mechanism of the invention comprises at least three wall-attached bases 1, a motor 2, a driving platform 3, a rail upright post 4, a screw and nut mechanism 5 and a transmission mechanism 6.

The wall attaching base 1 is provided with at least three bases 11 which are arranged on the surface of a wall body at equal intervals along the vertical direction, and the interval between the adjacent bases 11 is the height of one floor, so that the driving platform 3 or the rail upright post 4 can be fixed on the wall attaching base 1 after being jacked up for one floor height at one time. Correspondingly, the wall-attached base 1 comprises a base 11, a first hanging rod 12 and a second hanging rod 13, wherein the first hanging rod 12 is used for fixing the rail upright post 4, and the second hanging rod 13 is used for fixing the driving platform 3. Specifically, the second hanging rod 13 is of a plug pin type structure, when the driving platform 3 is jacked up, the second hanging rod 13 is pulled out to prevent mutual interference with the driving platform 3, and after the driving platform 3 is jacked in place, the second hanging rod 13 is reinserted into the driving platform 3 and fixed.

The top of the rail upright post 4 supports the operation platform and moves along the vertical direction relative to the wall attaching base 1. The common rail upright post 4 is of an I-shaped steel structure, namely, the common rail upright post is formed by welding double channel steel and an intermediate connecting steel plate, and the common rail upright post is complex in manufacturing process and high in cost. For convenience of processing, the rail upright post 4 comprises a first hook 41, a circular tube 42 and a flange plate 43, wherein the circular tube 42 is vertically arranged and connected with the operation platform, the flange plate 43 is fixed on the side surface of the circular tube 42, and a plurality of first hooks 41 are arranged on the side surface of the flange plate 43 along the vertical direction. In the specific processing process, the flange plate 43 can be directly welded on the side surface of the circular steel tube; specifically, in order to improve the welding strength, the side surface of the circular steel tube may be first cut or ground to form a plane, and then the flange plate 43 is welded to the plane surface.

A plurality of first hooks 41 are arranged on the rail upright post 4 along the vertical direction and towards one side of the wall-attached seat 1 and are used for being hung on the first hanging rod 12. In order to prevent the first hook 41 from interfering with the first hanging rod 12 in the jacking process, the wall attaching base 1 further comprises two first supporting plates 15 which are oppositely arranged on the surface of the base 11, inclined grooves 16 are oppositely and parallelly arranged on the surfaces of the two first supporting plates 15, the first hanging rod 12 moves along the inclined grooves 16, the lowest point of each inclined groove 16 is located on the stroke of the first hook 41 moving in the vertical direction, and the highest point of each inclined groove 16 is located outside the stroke of the first hook 41 moving in the vertical direction. Specifically, the top of the first hook 41 is provided with an inclined surface, so that the first hanging rod 12 can be pushed away when being lifted to contact with the first hook 41.

In order to limit the rail upright post 4 and the wall attaching base 1 to move relatively along the vertical direction and prevent the side turning or shaking, the wall attaching base 1 further comprises two guide blocks 14, the guide blocks 14 are relatively fixed with the base 11 and are connected with the flange plate 43 in a sliding mode, and the guide blocks 14 surround the flange plate 43 from the outer side.

And the driving platform 3 is connected with the rail upright post 4 in a sliding manner in the vertical direction and is used for fixing the motor 2 and providing a support for jacking the rail upright post 4. Drive platform 3 includes second couple 31, platform body 32, two telescopic support leg 33 and two limit slide 34, wherein:

in order to limit the driving platform 3 and the rail upright post 4 to only move along the vertical direction and prevent the driving platform 3 from rotating around the screw rod 51 in the jacking process, the invention is provided with two limiting slide blocks 34 for limiting the driving platform. Specifically, the two limit sliders 34 are fixed to the platform body 32, and are respectively disposed on two sides of the circular tube 42 and slidably connected thereto.

During the ascending process of the rail upright 4, the second hook 31 needs to be hung on the second hanging rod 13 to provide support for the rail upright 4. Due to the fact that the weight borne by the rail upright post 4 is large, all the weight is borne on the second hanging rod 13 in the ascending process of the rail upright post 4, and bending deformation and even breakage of the rail upright post are easily caused. Therefore, the invention is provided with two telescopic supporting legs 33, the second hook 31 and the telescopic supporting legs 33 are arranged on one side facing the wall base 1, and the two telescopic supporting legs 33 selectively abut against the surface of the wall body. Thus, when the rail upright 4 needs to be driven to ascend, the telescopic supporting leg 33 is adjusted to be abutted against the surface of the wall, and the second hook 31 and the telescopic supporting leg 33 provide stable support. Specifically, telescopic support leg 33 includes load seat, screw rod and adjusting nut, and the screw rod is fixed and passes platform body 32 with the load seat, and adjusting nut is provided with two, sets up respectively in platform body 32 both sides and with screw rod threaded connection.

When the rail upright post 4 needs to be driven to ascend, the telescopic supporting leg 33 extends out to jack up the driving platform 3, and at the moment, the limiting slide block 34 needs to be separated from the rail upright post 4 to reduce friction force; when the driving platform 3 needs to be jacked, the limiting slide block 34 is required to be tightly attached to the rail upright post 4, so that the driving platform 3 is prevented from rotating around the screw rod 51. Therefore, the contact surface of the limiting slide block 34 and the circular tube 42 is an inner arc surface, and the contact surface of the two limiting slide blocks 34 and the circular tube 42 is positioned on the semi-cylindrical surface of the circular tube 42 close to one side of the platform body 32.

The feed screw nut mechanism 5 comprises a feed screw 51 and a feed screw nut 52, one end of the feed screw 51 is hinged with the rail upright post 4, the other end of the feed screw 51 is connected with the feed screw nut 52, the feed screw nut 52 is rotatably connected with the driving platform 3, and the motor 2 is fixed on the driving platform 3 and drives the feed screw nut 52 to rotate forwards or reversely. Therefore, the motor 2 drives the lead screw nut 52 to rotate, and under the limiting action of the driving platform 3, the lead screw nut 52 can only move linearly along the lead screw 51. Specifically, the feed screw nut 52 of the present invention is driven by a chain wheel, wherein the feed screw nut 52 comprises two feed screw nuts, one of the two feed screw nuts is a chain wheel 521, the other one is a lower feed screw nut 522, the chain wheel 521 is connected with the motor 2 for driving, and the lower feed screw nut 522 is driven, so that the feed screw 51 can be stabilized, and the end thereof can be prevented from shaking.

And the transmission mechanism 6 converts the output of the motor 2 into the motion of the driving platform 3 along the screw rod 51, and comprises a first chain wheel 61, a first deep groove ball bearing 62, a second deep groove ball bearing 63, an upper bearing seat 64, a lower bearing seat 65, a chain 66, a first conical roller bearing 68 and a second conical roller bearing 67, wherein:

the upper bearing seat 64 and the lower bearing seat 65 are respectively fixed at the upper part and the lower part of the driving platform 3, the first deep groove ball bearing 62 and the second deep groove ball bearing 63 are respectively fixed in the upper bearing seat 64 and the lower bearing seat 65, the first chain wheel 61 is fixed with the output shaft of the motor 2, the chain wheel 521 is in threaded connection with the screw rod 51 and is in transmission connection with the first chain wheel 61 through the chain 66, the chain wheel 521 is fixed with the first deep groove ball bearing 62, and the lower screw nut 522 is in threaded connection with the screw rod 51 and is fixed with the second deep groove ball bearing 63. Specifically, in order to improve the conduction effect, the sprocket 521 and the first sprocket 61 are designed as double sprockets.

Because the driving platform 3 and the rail upright 4 have larger overall weight, in order to improve the stress in the vertical direction, the invention is provided with a first conical roller bearing 68 and a second conical roller bearing 67, the first conical roller bearing 68 and the second conical roller bearing 67 are respectively fixed in the upper bearing seat 64 and the lower bearing seat 65, and the chain wheel 521 and the lower screw nut 522 are respectively fixed with the first conical roller bearing 68 and the second conical roller bearing 67.

The following introduces a disposable wall-attached jacking method of the invention, comprising the following steps:

s1, in the initial state, the first hook 41 is hooked on the first hook lever 12, and the second hook 31 is hooked on the second hook lever 13.

And S2, jacking the rail upright post 4. The motor 2 rotates forwards, the rail upright post 4 is conducted and driven to ascend by one floor through the screw rod nut mechanism 5, and the first hook 41 of the rail upright post 4 ascends by one floor and then is hung on the first hanging rod 12 of the previous wall base 1. Specifically, before driving motor 2 corotation, adjust telescopic support leg 33 earlier, make it top on the wall body for two limit slide 34 break away from with pipe 42, in order to reduce the friction of track stand 4 with limit slide 34, and telescopic support leg 33 provides stable support for track stand 4.

And S3, jacking the driving platform 3. The motor 2 rotates reversely, the driving platform 3 is conducted and jacked up to rise by a floor height through the screw rod nut mechanism 5, the second hook 31 of the driving platform 3 rises by a floor and then is hung on the second hanging rod 13 of the previous wall base 1, and jacking operation of the floor is completed. Specifically, before the driving motor 2 rotates reversely, the telescopic support legs 33 are adjusted to retract from the wall, so that the two limit sliders 34 are in sliding contact with the circular tube 42 to prevent the driving platform 3 from rotating around the screw rod 51. The overall weight of the drive platform 3 is calculated to be very light relative to the weight of the drive platform 3 and the work platform carried thereby, and therefore does not need to be supported by the telescopic support legs 33.

The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.