CN112174026A

CN112174026A - Jacking device and jacking method for large members of stadium

Info

Publication number: CN112174026A
Application number: CN202011071689.9A
Authority: CN
Inventors: 水龙飞; 金仁才; 陈祥; 李伟坤
Original assignee: China MCC17 Group Co Ltd
Current assignee: China MCC17 Group Co Ltd
Priority date: 2020-10-09
Filing date: 2020-10-09
Publication date: 2021-01-05

Abstract

The invention discloses a jacking device and a jacking method for a large-scale member of a venue, and belongs to the technical field of jacking equipment and methods. The jacking device comprises a movable base, a folding lifting rod and a top plate, wherein the movable base is movably connected with the top plate through the folding lifting rod; and two sides of the first sliding block are provided with positioning tooth blocks, a row of positioning racks parallel to the movement direction of the first sliding block are correspondingly arranged below the positioning tooth blocks respectively, the positioning tooth blocks are connected with a hydraulic driving mechanism, and the hydraulic driving mechanism is used for driving the positioning tooth blocks to move up and down. The jacking device can effectively avoid the phenomenon that the jacking plate freely ascends and descends due to the failure of the hydraulic device, reduces the potential safety hazard, and has good stability and reliable use.

Description

Jacking device and jacking method for large members of stadium

Technical Field

The invention belongs to the technical field of jacking equipment and methods, and particularly relates to a jacking device and a jacking method for a large-scale member of a venue.

Background

In the process of city construction, in order to meet the mental culture requirements of people, venues can be built in a certain area to regularly hold activities. When parts are repaired and replaced in a venue, particularly for large components, the lifting position of the large components needs to be moved, so that the height of the large components is changed, and the large components are convenient to operate. In order to reduce the application consumption of manual labor force, the positioning height of a large-scale component is usually changed by adopting a mechanical jacking structure at present, so that the installation and replacement operation of the large-scale component are more convenient, and the stability and the efficiency of work are improved.

However, the existing jacking structure for the large-scale members of the stadium still has some problems when in use. When using, the existing jacking structure is inconvenient to be well limited on the ground due to the integral structure, so that the phenomenon of movement deviation is easy to occur, the jacking instability of the component is caused, the component is caused to drop and move and collide, and the integral stability is not enough. In addition, this jacking structure is when carrying out the jacking operation, if its hydraulic means who is used for the jacking uses inefficacy, the jacking board of this jacking structure can take place freely lift phenomenon for the component is quick tenesmus, not only can damage the component, also has certain potential safety hazard.

Through retrieval, relevant patents on jacking structures have been disclosed. If, chinese patent application No. 201922212311.5 discloses a lift platform locking device, including the upper mounting plate, the upper mounting plate below is equipped with down the platform, be equipped with between lower platform and the upper mounting plate and cut the fork arm, through cutting fork arm swing joint between upper mounting plate and the lower platform, cut and pass through fixed block articulated installation cylinder on the fork arm, the recess is seted up respectively to the opposite face of upper mounting plate and lower platform, the spout is seted up respectively to every recess inner wall front and back face, be equipped with a slider in every spout respectively, the opposite face of two sliders that correspond around being located same surface of water articulates the expansion end that connects to cut the fork arm respectively. And the two sides of the front surface and the two sides of the rear surface of the lower platform are respectively and fixedly provided with a fixing device, and the fixing devices comprise locking plates, screw holes and screw rods. Although the application can prevent the upper platform from suddenly dropping in the rising process, the design of the limit position of the application is complex, the operation is not flexible enough, the positioning of the lower platform is also not flexible enough, and the overall structure of the application needs to be further improved.

Disclosure of Invention

1. Problems to be solved

The invention aims to solve the problems that a jacking plate of the existing jacking structure can freely lift when a hydraulic device fails, so that a component is damaged, and potential safety hazards exist, and provides a jacking device and a jacking method for a large-scale component of a venue. By adopting the technical scheme of the invention, the problems can be effectively solved, the phenomenon that the jacking plate freely ascends and descends due to the failure of the hydraulic device is avoided, the potential safety hazard is reduced, and the hydraulic jacking device has better stability and reliable use.

2. Technical scheme

In order to solve the problems, the technical scheme adopted by the invention is as follows:

the jacking device for the large-scale members of the venue comprises a movable base, a folding lifting rod and a top plate, wherein the movable base is movably connected with the top plate through the folding lifting rod; and two sides of the first sliding block are provided with positioning tooth blocks, a row of positioning racks parallel to the movement direction of the first sliding block are correspondingly arranged below the positioning tooth blocks respectively, the positioning tooth blocks are connected with a hydraulic driving mechanism, and the hydraulic driving mechanism is used for driving the positioning tooth blocks to move up and down.

Furthermore, the hydraulic driving mechanism comprises a second sealing cavity and a second telescopic column, oil is filled in the second sealing cavity, a flow limiting piece capable of moving up and down is arranged above the oil, the bottom of the second telescopic column is connected with the positioning tooth block, and the top of the second telescopic column is communicated with the second sealing cavity through an oil pipe.

Furthermore, the flow limiting piece comprises a flow limiting block and a threaded rod which are vertically arranged, the threaded rod penetrates through the second sealing cavity, a sleeve is in threaded connection with the threaded rod, and a motor crawler assembly is installed on the outer side of the sleeve; the size of the flow limiting block is matched with that of the second sealing cavity.

Furthermore, an elastic connecting piece is fixedly arranged between the positioning tooth block and the piston at the bottom of the second telescopic column.

Furthermore, the front and the back of the two sides of the movable base are respectively provided with a movable wheel, a first telescopic column which can horizontally stretch and retract is arranged between the two movable wheels at each side, pistons at the two sides of the first telescopic column are respectively and fixedly provided with a damping ring, and the damping rings correspond to the size and the position of the movable wheels.

Furthermore, a first sealing cavity is arranged in the middle of the movable base, a lead screw penetrates through the first sealing cavity and is mounted on a bearing, and a driving motor is fixedly mounted at one side end of the lead screw; the thread directions of the outer walls of the two sides of the screw rod are opposite, the threads of the two sides of the screw rod are connected with flow limiting plates, the flow limiting plates can be slidably arranged in the first sealing cavity and are matched with the size of the first sealing cavity, and oil is filled between the two flow limiting plates and the inner walls of the two sides of the first sealing cavity respectively; the hydraulic rod is hinged between the middle of the folding lifting rod and the movable base, two sides of the first sealing cavity are communicated with the hydraulic rod through the guide pipe, and two sides of the first sealing cavity are also communicated with the first telescopic column through the first communicating pipe.

Furthermore, a sliding rail is arranged on the movable base, a sliding groove matched with the sliding rail is arranged on the first sliding block, and the first sliding block is clamped and installed on the sliding rail; and positioning grooves are arranged on two sides of the sliding rail, and the positioning racks are positioned at the bottoms of the positioning grooves and correspond to the positioning tooth blocks.

Furthermore, the positioning rack is of a unilateral arc-shaped sawtooth structure which is uniformly distributed at equal intervals, the bottom of the positioning tooth block is also of a unilateral arc-shaped structure, and the positioning tooth block can slide in one direction relative to the positioning rack.

Furthermore, the bottom of the top plate is provided with a sliding chute, a second sliding block is arranged in the sliding chute in a sliding manner, the movable end on one side of the upper end of the folding lifting rod is hinged to the second sliding block, and the movable end on the other side of the upper end of the folding lifting rod is hinged to the top plate; the movable end on the other side of the lower end of the folding lifting rod is hinged to the movable base.

The invention relates to a method for jacking a large member of a venue, which adopts the jacking device and comprises the following specific processes: moving the movable base to a proper position, and limiting movable wheels on two sides of the movable base; then the folding lifting rod drives the top plate and the components on the top plate to jack upwards, and the positioning tooth block and the positioning rack slide in a single side and are limited reversely; when the limit is released, the hydraulic driving mechanism is utilized to drive the positioning tooth block to move upwards to separate from the positioning rack, and the first sliding block is released from the limit and can freely slide.

3. Advantageous effects

Compared with the prior art, the invention has the beneficial effects that:

(1) according to the jacking device for the large members in the stadium, the first sliding block at the bottom of the folding lifting rod is limited, the limiting structure of the first sliding block is optimally designed, the positioning tooth blocks are arranged on two sides of the first sliding block, the positioning racks matched with the first sliding block are arranged, and the matching effect of the positioning tooth blocks and the positioning racks is utilized, so that the limiting effect of the first sliding block is ensured, the situation that the jacking plate can freely lift when a hydraulic device fails to be used is avoided, the operation safety is improved, and the maintenance and the replacement of the large members in the stadium are guaranteed.

(2) According to the jacking device for the large-scale members in the stadium, the specific structure of the driving source for driving the positioning tooth block to move up and down is optimally designed, the positioning tooth block is movably connected with the second telescopic column, and the current limiting piece is driven by the motor track assembly to move up and down in the second sealing cavity under the conduction action of the second sealing cavity and the second telescopic column, so that the oil pressure in the second sealing cavity is changed, the telescopic motion state of the second telescopic column is conveniently adjusted, the positioning tooth block at the bottom of the second telescopic column moves up and down, and the height of the second telescopic column is changed; and it carries out the optimal design and fixes a position the elastic connection between tooth piece and the flexible post of second through the concrete structural shape to location tooth piece and location rack to realized that unilateral slides and unilateral is spacing between location tooth piece and the location rack, made the position shift of first slider change by user's regulation, when jacking device takes place freely to fall, carry out the tenesmus of component spacing, reach the effect of using the protection, prevent that the jacking device from appearing the hidden danger that the tenesmus leads to when using.

(3) According to the jacking device for the large members in the stadium, the first telescopic columns are arranged on the two sides of the movable base, the damping rings are fixedly mounted on the pistons on the two sides of the first telescopic columns, and the damping rings are driven by the first telescopic columns to move to be in contact with the movable wheels, so that the movable wheels can be limited, the jacking device can be conveniently lifted and used, the overall stability and effectiveness of structural positioning are improved, the structural positioning cannot be changed due to position movement during use, the structure and the members cannot shake due to touch and the like during jacking operation, the jacking device is more stable to use, and the use safety is improved.

(4) According to the jacking device for the large members in the stadium, the first sealing cavity is formed in the movable base, and the position of the flow limiting plate in the first sealing cavity is changed through movement, so that oil in the first sealing cavity is synchronously led into the first telescopic column and the hydraulic rod in batches, and the lifting motion of the jacking device and the integral positioning of the structure are controlled. And its overall structure modern design, spacing effect is outstanding, the facilitate promotion.

(5) According to the method for jacking the large-scale members in the venue, the moving wheels on the two sides of the moving base are limited, the hydraulic driving mechanism is used for driving the positioning toothed block to move up and down, the positioning toothed block is matched with the positioning rack for limiting the first sliding block, so that a secondary limiting function is realized, the integral positioning of the structure of the jacking device is realized, the stability of the jacking device is improved, the free falling phenomenon of the jacking plate is avoided, the use protection effect is achieved, the operation is simple and convenient, and the reliability is good.

Drawings

FIG. 1 is a schematic front view of a jacking apparatus of the present invention;

FIG. 2 is a schematic diagram of the internal structure of the first capsule according to the present invention;

FIG. 3 is a schematic view of the mounting structure of the slider of the present invention;

FIG. 4 is a schematic view of the engagement between the positioning block and the positioning rack of the present invention;

fig. 5 is a schematic view of the internal structure of the second capsule according to the present invention.

In the figure: 1. moving the base; 101. a first sealed chamber; 102. a slide rail; 103. positioning a groove; 104. positioning the rack; 2. a moving wheel; 3. folding the lifting rod; 4. a top plate; 401. a chute; 5. a hydraulic lever; 6. a first slider; 7. a second slider; 8. a screw rod; 9. a drive motor; 10. a restrictor plate; 11. a flow guide pipe; 12. a first communication pipe; 13. a first telescopic column; 14. a damping ring; 15. a second sealed chamber; 16. a sleeve; 17. a motor track assembly; 1701. a crawler belt; 1702. a motor; 18. a flow restriction; 1801. a flow limiting block; 1802. a threaded rod; 1803. a convex plate; 19. a second telescopic column; 20. a second communicating pipe; 21. positioning a tooth block; 22. an elastic connecting piece.

Detailed Description

The invention is further described with reference to specific examples.

Example 1

As shown in fig. 1, the jacking device for the large members in the venue of this embodiment includes a movable base 1, folding lifting rods 3 and a top plate 4, the movable base 1 is movably connected with the top plate 4 through two folding lifting rods 3 at the front and back, a hydraulic rod 5 is hinged between the middle of each folding lifting rod 3 and the movable base 1, namely, one end of the hydraulic rod 5 is hinged to the movable base 1, and the other end is hinged to the middle of the folding lifting rod 3. Two first sliding blocks 6 are slidably mounted on the moving base 1, the movable end of one side of the lower end of each folding lifting rod 3 is hinged with the corresponding first sliding block 6, and the movable end of the other side of each folding lifting rod is hinged on the moving base 1; the bottom of the top plate 4 is correspondingly provided with two sliding grooves 401, a second sliding block 7 is arranged in each sliding groove 401 in a sliding mode, the movable end of one side of the upper end of each folding lifting rod 3 is hinged to the corresponding second sliding block 7, the movable end of the other side of each folding lifting rod is hinged to the top plate 4, and the folding lifting rods 3 are driven by the hydraulic rods 5 to stretch and control the top plate 4 to move up and down. As shown in fig. 4, two sides of the first sliding block 6 are provided with positioning tooth blocks 21, a row of positioning racks 104 parallel to the moving direction of the first sliding block 6 are respectively and correspondingly arranged below the positioning tooth blocks 21, and the positioning tooth blocks 21 are connected with a hydraulic driving mechanism for driving the positioning tooth blocks 21 to move up and down. Through setting up location tooth piece 21 in first slider 6 both sides to set up rather than matched with location rack 104, utilize the cooperation of location tooth piece 21 with location rack 104, thereby can carry on spacingly to first slider 6, can avoid hydraulic stem 5 to use to lose efficacy to lead to roof 4 to take place the free lift phenomenon, guaranteed the security of operation, provide the guarantee for the maintenance and the change of the large-scale component in venue.

Specifically, as shown in fig. 4 and 5, the hydraulic driving mechanism includes a second sealed cavity 15 and a second telescopic column 19, the second sealed cavity 15 is fixedly installed at the top of the first sliding block 6, and a sleeve 16 is bearing-installed at the top of the second sealed cavity 15. The second sealed chamber 15 is filled with oil, and a flow restriction member 18 which can move up and down is provided above the oil. This current-limiting piece 18 includes current-limiting block 1801, threaded rod 1802 and flange 1803, current-limiting piece 18's side cross-section is "worker" style of calligraphy structure, and current-limiting block 1801 sets up with threaded rod 1802 is perpendicular, current-limiting block 1801 slidable mounting in second sealed chamber 15 and with the size phase-match of second sealed chamber 15, be axial slip between current-limiting block 1801 and the second sealed chamber 15, the sliding connection of radial block promptly, and current-limiting block 1801 outside cover has the sealing ring, the adjustment of the inside pressure of second sealed chamber 15 of being convenient for the inside fluid of second sealed chamber 15 passes through in oil pipe gets into the flexible post 19 of second, controls its concertina movement. The threaded shaft 1802 extends through the cannula 16 and the second sealed cavity 15 and is threadedly attached to the cannula 16. The motor track assembly 17 is installed on the outer side of the sleeve 16, the motor track assembly 17 comprises a track 1701 and a motor 1702, the motor 1702 is fixedly installed on the first sliding block 6, a transmission wheel is arranged on an output shaft of the motor 1702, the track 1701 is installed on the transmission wheel and the sleeve 16, the sleeve 16 is driven to rotate through the motor 1702, and the sleeve 16 is in threaded connection with the threaded rod 1802, so that the flow limiting piece 1801 of the flow limiting piece 18 is driven to move up and down, and the oil pressure in the second sealed cavity 15 is controlled. A ledge 1803 at the top of threaded rod 1802 prevents flow restrictor 18 from being removed from sleeve 16, ensuring proper drive.

The second telescopic column 19 is fixedly arranged on the outer walls of the two sides of the first sliding block 6, the top of the second telescopic column 19 is communicated with the second sealing cavity 15 through a second communicating pipe 20 (namely an oil pipe), an elastic connecting piece 22 is fixedly arranged between the bottom of the second telescopic column and the positioning tooth block 21, and a bottom piston of the second telescopic column 19 is connected with the positioning tooth block 21 through the elastic connecting piece 22 (such as a spring). Carry out the optimal design through the concrete structure of the driving source to location tooth piece 21, with location tooth piece 21 and the flexible post 19 swing joint of second, under the inside effect of switching on of the flexible post 19 of second sealed chamber 15 and second, reciprocate in the second sealed chamber 15 through motor track subassembly 17 drive current-limiting piece 18, change the interior fluid pressure of second sealed chamber 15, thereby conveniently adjust the concertina movement state of the flexible post 19 of second, make the location tooth piece 21 of its bottom reciprocate, carry out the change of its height. As shown in fig. 3 and 4, a slide rail 102 is disposed on the movable base 1, a slide groove matched with the slide rail 102 is disposed on the first slide block 6, and the first slide block 6 is mounted on the slide rail 102 in a clamping manner. Positioning grooves 103 are formed in two sides of the slide rail 102, and the positioning rack 104 is located at the bottom of the positioning groove 103 and corresponds to the positioning tooth block 21. The positioning rack 104 is a one-side arc sawtooth structure which is uniformly distributed at equal intervals, namely, the positioning rack 104 is a ratchet structure, the bottom of the positioning tooth block 21 is also a one-side arc structure, namely, the positioning tooth block 21 is a ratchet structure, and the positioning tooth block 21 can slide in one direction relative to the positioning rack 104, so that the position of the first sliding block 6 can be conveniently moved and changed, and the sliding of the first sliding block is smoother and more stable. A relative telescopic structure is formed between the positioning tooth block 21 and the second telescopic column 19, and the bottom of the positioning tooth block 21 is in close sliding connection with the positioning rack 104, so that the one-way sliding and the one-way limiting control of the first sliding block 6 are facilitated, and the release of the limiting control state is facilitated manually. Through adopting elastic connection piece 22 to be connected between flexible post 19 with location tooth piece 21 and second to carry out optimal design to the concrete structural shape of location tooth piece 21 and location rack 104, thereby realized that unilateral slides and unilateral are spacing between location tooth piece 21 and the location rack 104, make the position of first slider 6 remove and receive user's regulation change, when jacking device takes place freely and weighs down, carry out the weight down of component spacing, reach the effect of using the protection.

As shown in fig. 1, the front and the back of two sides of the movable base 1 are respectively provided with the movable wheels 2, a first telescopic column 13 which can horizontally stretch is arranged between the two movable wheels 2 at each side, the first telescopic column 13 is fixedly arranged on the outer walls of two sides of the movable base 1, damping rings 14 are fixedly arranged at the end parts of pistons at two sides of the first telescopic column 13, the damping rings 14 correspond to the size and the position of the movable wheels 2, the pistons at two sides of the first telescopic column 13 are controlled to stretch out, the damping rings 14 can be in contact with the walls of the movable wheels 2 for limiting the movable wheels 2, the lifting and the use of the lifting device are facilitated, the overall stability of the structure positioning is improved, the position of the lifting device can not be changed when the lifting and the use are carried out, the shaking of structures and components due to the conditions such as touching can not be caused, the use is. As shown in fig. 2, a first sealing cavity 101 is arranged in the middle of the moving base 1 in an inward embedded manner, a screw 8 penetrates through the first sealing cavity 101 and is mounted on a bearing, a driving motor 9 is connected to an end portion of one side of the screw 8, and the driving motor 9 is fixedly mounted on an outer wall of the first sealing cavity 101; the outer wall threads on the two sides of the screw rod 8 are opposite in direction, the threads on the two sides of the screw rod 8 are connected with the flow limiting plates 10, the edges of the flow limiting plates 10 are made of rubber, the flow limiting plates 10 can be slidably mounted in the first sealing cavity 101 and are matched with the first sealing cavity 101 in size, namely the flow limiting plates 10 are in sliding connection with the inner wall of the first sealing cavity 101 in a sealing and fitting manner, and the outer wall threads on the two sides of the screw rod 8 are opposite in direction, so that the two flow limiting plates 10 are opposite in movement direction; oil liquid is respectively filled between the two flow limiting plates 10 and the inner walls of the two sides of the first sealing cavity 101. The two sides of the first sealed cavity 101 of the movable base 1 are communicated with the two hydraulic rods 5 through a guide pipe 11, and the two sides of the first sealed cavity are also communicated with the two first telescopic columns 13 through a first communication pipe 12. Through set up first seal chamber 101 on removing base 1, utilize 8 rotary motion of lead screw in the drive motor 9 drive first seal chamber 101, change the position relation of restrictor plate 10 to change the fluid pressure of first seal chamber 101, make the inside fluid of first seal chamber 101 in turn lead in first flexible post 13 and hydraulic stem 5 in step, the concertina movement of control hydraulic stem 5 and first flexible post 13, and then the overall positioning of the elevating movement and the structure of control jacking device.

Example 2

The method for jacking the large members in the stadium adopts the jacking device in the embodiment 1, and comprises the following specific processes: when a large-scale member of a venue is jacked up, the movable base 1 is moved to a proper position through the movable wheel 2, then the driving motor 9 is started, the screw rod 8 is driven to rotate through the driving motor 9, two flow limiting plates 10 in threaded connection on the screw rod 8 slide in the first sealed cavity 101, the pressure of the oil in the first sealed cavity 101 is changed through adjustment, the oil in the first sealed cavity 101 is led into the hydraulic rod 5 and the first telescopic column 13 through the guide pipe 11 and the first communication pipe 12 respectively, and the telescopic motion of the hydraulic rod 5 and the first telescopic column 13 is controlled. When the piston of the first telescopic column 13 extends outwards, the damping ring 14 at the end part of the piston can limit the moving wheels 2 on two sides of the moving base 1, and the moving base 1 does not move any more, so that the whole structure is more stable in positioning. Meanwhile, the piston of the hydraulic rod 5 also extends outwards, so that the folding lifting rod 3 connected with the piston is unfolded to jack the top plate 4 and the components on the top plate upwards; when the folding lifting rod 3 is unfolded, the first sliding block 6 at the lower end of the folding lifting rod 3 slides in a clamping manner with the moving base 1, and the positioning tooth blocks 21 at two sides of the first sliding block 6 are attached to and slide with the positioning rack 104 in the positioning groove 103 of the moving base 1. Because the positioning tooth blocks 21 on the two sides of the first sliding block 6 and the end part of the second telescopic column 19 are telescopic under the action of the elastic connecting piece 22, the first sliding block 6 can move towards the right side without limitation; and when the internal structure of the first sealed cavity 101 is damaged, and the folding lifting rod 3 and the top plate 4 do the falling motion, the positioning tooth blocks 21 at the two sides of the first sliding block 6 are clamped with the positioning rack 104 on the movable base 1, so that the falling motion of the folding lifting rod 3 and the top plate 4 is stopped, and the positioning tooth blocks 21 and the positioning rack 104 slide in a single side and are limited reversely by adopting multiple limits, so that the use safety of the device is ensured.

When the limit of the movement of the first sliding block 6 towards the left side needs to be released so that the folding lifting rod 3 can be folded and lowered, the sleeve 16 is driven to rotate under the action of the motor crawler assembly 17, the sleeve 16 is connected with the flow limiting block 1801 and the threaded rod 1802 of the flow limiting piece 18 through threads, the flow limiting block 1801 at the bottom of the flow limiting piece 18 is axially and radially clamped with the second sealed cavity 15, so that the height of the flow limiting piece 18 in the second sealed cavity 15 is changed, oil in the second sealed cavity 15 is controlled to be led in or led out from the second telescopic column 19, the telescopic length of the second telescopic column 19 and the positioning height of the positioning tooth block 21 at the bottom of the second telescopic column are changed, the positioning tooth block 21 can be moved upwards to be separated from the positioning rack 104, and the limit of the first sliding block 6 is released and can freely slide. Through adopting secondary limit function, carry on spacingly respectively to removing wheel 2 and first slider 6 to improved jacking device overall positioning's stability, avoided roof 4 to take place the phenomenon of freely weighing down again, reach the effect of using the protection, the good reliability.

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 various changes in the embodiments and/or modifications of the invention can be made, and equivalents and modifications of some features of the invention can be made without departing from the spirit and scope of the invention.

Claims

1. The utility model provides a jacking device for large-scale component in venue, is including removing base (1), folding lifter (3) and roof (4), removes between base (1) and roof (4) and links to each other its characterized in that through folding lifter (3) activity: a first sliding block (6) is slidably arranged on the movable base (1), and the first sliding block (6) is hinged with the movable end on one side of the lower end of the folding lifting rod (3); the two sides of the first sliding block (6) are provided with positioning tooth blocks (21), a row of positioning racks (104) parallel to the movement direction of the first sliding block (6) are correspondingly arranged below the positioning tooth blocks (21), the positioning tooth blocks (21) are connected with a hydraulic driving mechanism, and the hydraulic driving mechanism is used for driving the positioning tooth blocks (21) to move up and down.

2. The jacking device for the large members of the stadium according to claim 1, wherein: the hydraulic driving mechanism comprises a second sealing cavity (15) and a second telescopic column (19), oil is filled in the second sealing cavity (15), a flow limiting piece (18) capable of moving up and down is arranged above the oil, the bottom of the second telescopic column (19) is connected with a positioning tooth block (21), and the top of the second telescopic column is communicated with the second sealing cavity (15) through an oil pipe.

3. The jacking device for the large members of the stadium according to claim 2, wherein: the flow limiting piece (18) comprises a flow limiting block (1801) and a threaded rod (1802) which are vertically arranged, the threaded rod (1802) penetrates through the second sealing cavity (15), a sleeve (16) is in threaded connection with the threaded rod, and a motor track assembly (17) is installed on the outer side of the sleeve (16); the size of the flow limiting block (1801) is matched with that of the second sealing cavity (15).

4. The jacking device for the large members of the stadium according to claim 3, wherein: and an elastic connecting piece (22) is fixedly arranged between the positioning tooth block (21) and the piston at the bottom of the second telescopic column (19).

5. The jacking device for large members of stadiums according to any one of claims 1 to 4, wherein: the movable wheel (2) is arranged around the two sides of the movable base (1), a first telescopic column (13) capable of horizontally stretching is arranged between the two movable wheels (2) on each side, damping rings (14) are fixedly arranged on pistons on the two sides of the first telescopic column (13), and the damping rings (14) correspond to the size and the position of the movable wheels (2).

6. The jacking device for the large members of the stadium according to claim 5, wherein: a first sealing cavity (101) is arranged in the middle of the movable base (1), a screw rod (8) penetrates through the first sealing cavity (101) and is mounted in a bearing mode, and a driving motor (9) is fixedly mounted at one end of the screw rod (8); the thread directions of the outer walls of the two sides of the screw rod (8) are opposite, the threads of the two sides of the screw rod (8) are connected with flow limiting plates (10), the flow limiting plates (10) can be slidably installed in the first sealing cavity (101) and are matched with the first sealing cavity (101) in size, and oil is filled between the two flow limiting plates (10) and the inner walls of the two sides of the first sealing cavity (101); the hydraulic rod (5) is hinged between the middle of the folding lifting rod (3) and the movable base (1), two sides of the first sealing cavity (101) are communicated with the hydraulic rod (5) through the guide pipe (11), and two sides of the first sealing cavity are communicated with the first telescopic column (13) through the first communicating pipe (12).

7. The jacking device for large members of stadiums according to any one of claims 1 to 4, wherein: a sliding rail (102) is arranged on the movable base (1), a sliding groove matched with the sliding rail (102) is arranged on the first sliding block (6), and the first sliding block (6) is clamped and installed on the sliding rail (102); positioning grooves (103) are formed in two sides of the sliding rail (102), and the positioning racks (104) are located at the bottoms of the positioning grooves (103) and correspond to the positioning tooth blocks (21).

8. The jacking device for the large members of the stadium according to claim 7, wherein: the positioning rack (104) is of a unilateral arc sawtooth structure which is uniformly distributed at equal intervals, the bottom of the positioning toothed block (21) is also of a unilateral arc structure, and the positioning toothed block (21) can slide in one direction relative to the positioning rack (104).

9. The jacking device for large members of stadiums according to any one of claims 1 to 4, wherein: a sliding groove (401) is formed in the bottom of the top plate (4), a second sliding block (7) is installed in the sliding groove (401) in a sliding mode, the movable end of one side of the upper end of the folding lifting rod (3) is hinged to the second sliding block (7), and the movable end of the other side of the folding lifting rod is hinged to the top plate (4); the movable end on the other side of the lower end of the folding lifting rod (3) is hinged to the movable base (1).

10. A method for jacking a large member in a venue, which is characterized in that the jacking device according to any one of claims 1 to 9 is adopted, and the method comprises the following specific steps: moving the movable base (1) to a proper position, and limiting the movable wheels (2) on two sides of the movable base (1); then the folding lifting rod (3) drives the top plate (4) and the components on the top plate to jack upwards, and the positioning tooth block (21) and the positioning rack (104) slide at one side and are limited reversely; when the limit is released, the hydraulic driving mechanism drives the positioning gear block (21) to move upwards to separate from the positioning rack (104), and the first sliding block (6) releases the limit and can freely slide.