Jacking equipment of prefabricated box girder for mounting drop platform

Abstract

The invention provides jacking equipment of a prefabricated box girder for mounting a drop platform, and relates to the field of jacking. The device comprises a sliding rail structure, an angle sensor is arranged at the top of the sliding rail structure, a plurality of jacking structures are arranged in the sliding rail structure, a box girder loading structure is supported at the tops of the jacking structures, and the box girder loading structure and prefabricated box girders at the top of the box girder loading structure are jacked to proper positions one by one. The jacking work of the prefabricated box girder is met through the double-shaft hydraulic cylinder with the short telescopic stroke, the situation that a multi-stage telescopic jacking structure supports a heavy object after stretching, and consequently deformation cannot be contracted is avoided, and the situation that after stretching, the multi-stage telescopic jacking structure is broken due to the structural strength change, and consequently economic losses and even personnel injuries are caused is avoided; the box girder loading structure, the sliding rail structure and the jacking structure form prefabricated box girder jacking equipment with high safety.

Description

Technical Field

[0001] This invention relates to a lifting device, specifically a lifting device for precast box girders used in the installation of drop-off platforms, and belongs to the field of lifting technology. Background Technology

[0002] A box girder is a type of beam used in bridge engineering. It is hollow inside with flanges on both sides of the upper part, resembling a box, hence its name. Prestressed concrete precast box girders are prefabricated in a prefabrication plant and then transported to the installation site for installation.

[0003] However, with the development of construction technology, the cross-sectional dimensions of box girders are also increasing. Currently, the span of large box girders reaches 50 to 75m, the height of the internal space reaches 2 to 4m, the width of the bottom plate of the box girder reaches 5 to 20m, the width of the top plate of the box girder reaches 10 to 30m, and the weight is relatively large. Therefore, various equipment is needed to assist in the handling of precast box girders.

[0004] Lifting equipment is commonly used in the handling of precast box girders. However, in order to ensure the lifting height, existing lifting equipment uses multi-stage telescopic devices to complete the lifting work. After the multi-stage telescopic devices are extended, the hollow telescopic structure has poor structural strength. When lifting heavy objects, the multi-stage telescopic devices are prone to deformation or even breakage, resulting in economic losses or even personnel losses. Summary of the Invention

[0005] To address the problem that the hollow telescopic structure of a multi-stage telescopic device has poor structural strength after extension, making it prone to deformation or even breakage when lifting heavy objects, leading to economic losses and even personal injury, this invention provides the following technical solution: The lifting equipment for the precast box girder used in the drop-off platform includes a slide rail structure. An angle sensor is installed on the top of the slide rail structure. Multiple lifting structures are installed inside the slide rail structure. The top of the multiple lifting structures supports a box girder loading structure. The box girder loading structure includes a top box, and multiple threaded holes are provided on both sides of the top box; The lifting structure includes a motion box, a square block is fixedly connected to the center of the inner cavity of the motion box, a double-axis hydraulic cylinder is provided on both sides of the square block, a plurality of storage cavities are opened on one side of the square block, a snap-fit ​​cavity is provided on both sides of the storage cavity, the snap-fit ​​cavity is opened on the inner cavity of the motion box, and a support structure is provided on both sides inside the storage cavity. The support structure includes two second pads. A third spring-type telescopic rod is provided between the bottom of one side of each of the two second pads and the square block. A connecting beam is fixedly connected between the opposite sides of the two second pads away from the dual-axis hydraulic cylinder. A first pad is provided between the two second pads. A second spring-type telescopic rod is provided between the first pad and the moving box. Two second transmission plates are provided on the side of the first pad near the dual-axis hydraulic cylinder. The two second transmission plates are fixedly connected to the two second pads respectively. A square frame is provided between the square block and the box girder loading structure. An electric telescopic rod is fixedly connected to the bottom of the square frame. Two pneumatic cylinders are provided on one side of the electric telescopic rod. The two pneumatic cylinders are located between the two support structures. An electromagnet is fixedly connected to the top of the square frame. The electromagnet is magnetically attracted to the bottom of the box girder loading structure.

[0006] Preferably, the top box is provided with multiple support rollers, and each of the multiple support rollers is fixedly connected to an installation shaft. The installation shaft is rotatably connected to the inside of the top box, and one end of the installation shaft extends to the outside of the top box. Multiple L-shaped fixing plates are fixedly connected to both sides of the top of the top box, and a hydraulic cylinder is fixedly connected inside the L-shaped fixing plate. Long plates are provided on both sides of the top of the top box, and one end of the hydraulic cylinder is fixedly connected to the adjacent long plate.

[0007] Preferably, a support frame is fixedly connected to the bottom of the inner cavity of the top box, and multiple arc-shaped grooves are opened on the top of the support frame. The outer bottom of multiple support rollers are respectively disposed inside the multiple arc-shaped grooves, and multiple drag-reducing shafts are disposed inside the arc-shaped grooves. The drag-reducing shafts are rotatably connected to the support frame.

[0008] Preferably, one end of the second spring-type telescopic rod is fixedly connected to a first transmission plate, the first transmission plate is fixedly connected to a first pad, the outer wall of the second spring-type telescopic rod is fixedly connected to a square block, the outer wall of the third spring-type telescopic rod is fixedly connected to a square block, one end of the third spring-type telescopic rod is fixedly connected to a third transmission plate, and the third transmission plate is fixedly connected to a second pad.

[0009] Preferably, the first pad has two grooves, the second transmission plate is partially disposed inside the grooves, and the connecting beam is disposed at the bottom of the first pad.

[0010] Preferably, the square block has multiple transverse slots on its outer side, and the multiple transverse slots pass through multiple storage cavities respectively. Both of the pneumatic cylinders are set inside the transverse slots and are fixedly connected together. One end of the electric telescopic rod is fixedly connected to the outer wall of one of the pneumatic cylinders.

[0011] Preferably, a limiting frame is fitted on the top of the outer side of the square frame, the limiting frame is fixedly connected to the exercise box, a second reserved groove is opened on the outer side of the exercise box, a first reserved groove is opened on one side of the square block, and the first reserved groove is located on one side of the second reserved groove.

[0012] Preferably, a metal rod is fixedly connected to the extension end of the dual-axis hydraulic cylinder, an L-shaped frame is fixedly connected to the top of the metal rod, a plurality of small balls are fixedly connected inside the L-shaped frame, two sliding grooves are opened on both sides of the inside of the motion box, a T-shaped plate is provided inside the sliding groove, the T-shaped plate is fixedly connected to the adjacent dual-axis hydraulic cylinder, and nuts are fixedly connected to both sides of the L-shaped frame, with bolts provided inside the nuts.

[0013] Preferably, the slide rail structure includes a guide rail, an angle sensor is fixedly connected to the top of the guide rail, and an inner groove is provided on both sides of the guide rail. Multiple sets of clamping plates are provided inside the inner groove, and each set of clamping plates consists of multiple clamping plates. A first spring-type telescopic rod is fixedly connected to one side of each clamping plate, and a connecting plate is fixedly connected between the multiple first spring-type telescopic rods. An electric push rod is fixedly connected to one side of the connecting plate, and a protective shell is fixedly connected to one side of the electric push rod. The protective shell is fixedly connected to the outside of the guide rail, and the outer wall of the first spring-type telescopic rod penetrates the guide rail.

[0014] Preferably, a limiting vertical plate is provided between two adjacent card plates. The limiting vertical plate is located inside the inner groove and is fixedly connected to the guide rail. Multiple side support plates are fixedly connected to both sides of the motion box, and multiple bottom support plates are fixedly connected to the bottom of the motion box.

[0015] This invention provides a lifting device for precast box girders used in the installation of drop-off platforms, which has the following beneficial effects: 1. The drop-off platform is equipped with a precast box girder lifting device, which lifts the precast box girder loading structure and the top of the box girder loading structure to the appropriate position one by one. The lifting work of the precast box girder is met by a dual-axis hydraulic cylinder with a short telescopic stroke. This avoids the situation where the multi-stage telescopic lifting structure cannot retract due to deformation after supporting heavy objects. It also avoids the economic losses or even personal injuries caused by the change in structural strength of the multi-stage telescopic lifting structure after extension. The box girder loading structure, the sliding rail structure, and the lifting structure form a highly safe precast box girder lifting device.

[0016] 2. The drop-off platform is equipped with a jacking device for precast box girders. During the repeated lifting of the box girder loading structure, an angle sensor continuously monitors the tilt of one side of the box girder loading structure. This prevents the box girder loading structure from tilting under the action of the precast box girder and going unnoticed for a short time. Furthermore, by dividing the jacking of the precast box girder into multiple stages, the jacking device can stop working in time or reset the box girder loading structure, reducing the possibility of overall damage to the jacking device and minimizing economic losses.

[0017] 3. The drop-off platform is equipped with a lifting device for precast box girders. The working electric push rod pulls the connecting plate fixed at one end, causing the clamping plate to enter the inner groove. The moving box loses its limit, and the bolts are rotated and disassembled, removing the fixation between the L-shaped frame and the top box. At this time, the vehicle reverses, pushing the lifting structure, causing the lifting structure to move inside the slide rail structure. Multiple small balls fixedly connected inside the L-shaped frame contact the top box, and the small balls reduce the resistance of the L-shaped frame's movement. When the box girder loading structure is blocked and limited at the end away from the vehicle, the box girder loading structure enters the vehicle's loading position, loading the box girder loading structure and the precast box girder on top of the box girder loading structure together onto the vehicle. This avoids friction and wear between the precast box girder and the vehicle, and prevents the quality of the precast box girder from deteriorating during transportation. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the overall structure of the present invention; Figure 2 This is a partial structural schematic diagram of the guide track of the present invention; Figure 3 This is a schematic diagram of the structure of the motion box of the present invention; Figure 4 This is a schematic diagram of the square block structure of the present invention; Figure 5 This is a schematic diagram of the structure of the second pad and the square block of the present invention; Figure 6 This is a schematic diagram of the structure of the second pad of the present invention; Figure 7 This is a schematic diagram of the structure of the third transmission plate of the present invention; Figure 8 This is a schematic diagram of the structure of the second transmission plate of the present invention; Figure 9 This is a partial cross-sectional view of the motion box of the present invention; Figure 10 This is a schematic diagram of the limiting vertical plate of the present invention; Figure 11 This is a schematic diagram of the card plate of the present invention; Figure 12 For the present invention Figure 1 A schematic diagram of the C-section structure; Figure 13This is a schematic diagram of the T-shaped plate of the present invention.

[0019] Explanation of reference numerals in the attached drawings: 1. Box girder loading structure; 11. Top box; 12. Support roller; 13. Mounting shaft; 14. Support frame; 15. Arc groove; 16. Drag-reducing shaft; 17. Threaded hole; 18. L-shaped fixing plate; 19. Hydraulic cylinder; 110. Long plate; 2. Slide rail structure; 21. Guide rail; 22. Inner groove; 23. Clamping plate; 24. First spring-type telescopic rod; 25. Connecting plate; 26. Electric push rod; 27. Protective shell; 28. Limiting vertical plate; 3. Lifting structure; 31. Moving box; 32. Square block; 33. Storage cavity; 34. Transverse groove; 35. First pad plate; 36. Second spring-type telescopic rod; 37. First transmission... 38. Moving plate; 39. Groove; 310. Second transmission plate; 311. Second pad; 312. Third spring-type telescopic rod; 313. Pneumatic cylinder; 314. Electric telescopic rod; 315. Square frame; 316. Limiting frame; 317. Electromagnet; 318. First reserved slot; 319. Second reserved slot; 320. Snap-fit ​​cavity; 321. Dual-axis hydraulic cylinder; 322. Metal rod; 323. L-shaped frame; 324. Small ball; 325. Nut; 326. Bolt; 327. Bottom support plate; 328. Side support plate; 329. T-shaped plate; 330. Sliding groove; 331. Connecting beam; 4. Angle sensor. Detailed Implementation

[0020] This invention provides a lifting device for precast box girders used in the installation of drop-off platforms.

[0021] Please see Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 5 , Figure 6 , Figure 7 , Figure 8 , Figure 9 , Figure 10 , Figure 11 , Figure 12 and Figure 13 It includes a slide rail structure 2, an angle sensor 4 is installed on the top of the slide rail structure 2, and multiple lifting structures 3 are installed inside the slide rail structure 2. The top of the multiple lifting structures 3 supports a box beam loading structure 1. The box girder loading structure 1 includes a top box 11, and multiple threaded holes 17 are provided on both sides of the top box 11. The lifting structure 3 includes a motion box 31. A square block 32 is fixedly connected to the center of the inner cavity of the motion box 31. A dual-axis hydraulic cylinder 321 is provided on both sides of the square block 32. Multiple storage cavities 33 are opened on one side of the square block 32. A snap-fit ​​cavity 320 is provided on both sides of the storage cavity 33. The snap-fit ​​cavity 320 is opened on the inner cavity of the motion box 31. A support structure is provided on both sides inside the storage cavity 33. The support structure includes two second pads 310. A third spring-type telescopic rod 311 is provided between the bottom of one side of each of the two second pads 310 and the square block 32. A connecting beam 331 is fixedly connected between the opposite sides of the two second pads 310 away from the dual-axis hydraulic cylinder 321. A first pad 35 is provided between the two second pads 310. A second spring-type telescopic rod 36 is provided between the first pad 35 and the moving box 31. Two second transmission plates 39 are provided on the side of the first pad 35 near the dual-axis hydraulic cylinder 321. The two second transmission plates 39 are fixedly connected to the two second pads 310 respectively. A square frame 315 is provided between the square block 32 and the box girder loading structure 1. An electric telescopic rod 314 is fixedly connected to the bottom of the square frame 315. Two pneumatic cylinders 313 are provided on one side of the electric telescopic rod 314. The two pneumatic cylinders 313 are located between the two support structures. An electromagnet 317 is fixedly connected to the top of the square frame 315. The electromagnet 317 is magnetically attracted to the bottom of the box girder loading structure 1.

[0022] Specifically, multiple support rollers 12 are installed inside the top box 11, and mounting shafts 13 fixedly connected inside the multiple support rollers 12 are rotatably connected to the inside of the top box 11, so the support rollers 12 can rotate inside the top box 11. After the precast box girder is placed on top of the box girder loading structure 1, the precast box girder supported by the multiple support rollers 12 can move. The rotating support rollers 12 can reduce the resistance of the precast box girder's movement. Then, multiple lifting structures 3 are controlled to work and push the box girder loading structure 1 upward. After the precast box girder is lifted to the preset position, the workers can use forklifts, hydraulic equipment, etc. to push the precast box girder to the top of the transport vehicle parked on one side, completing the lifting and transporting work of the precast box girder. One end of each of the multiple mounting shafts 13 extends to the outside of the top box 11 and is rotatably connected to the top box 11. A sprocket and chain drive structure can be installed between the mounting shafts 13, so that the multiple mounting shafts 13 drive the multiple support rollers 12 to apply transport thrust to the precast box girder, reducing the resistance of loading the precast box girder and increasing the speed of precast box girder transfer.

[0023] A square block 32 is fixedly connected to the center of the inner cavity of the motion box 31. A dual-axis hydraulic cylinder 321 is installed on both sides of the square block 32. A metal rod 322 is fixedly connected to the extension end of the dual-axis hydraulic cylinder 321. Figure 3As shown, an L-shaped frame 323 is fixedly connected to the top of the metal rod 322. Two L-shaped frames 323 are set on both sides of the top box 11 to support the top box 11. Nuts 325 are fixedly connected to both sides of the L-shaped frame 323. One end of the bolt 326 with the thread inside the nut 325 is inserted into the threaded hole 17 opened on the outside of the top box 11, and the bolt 326 is threadedly connected to the top box 11. Therefore, the L-shaped frame 323 is fixedly installed on the outside of the top box 11, and the L-shaped frame 323 provides support between the lifting structure 3 and the top box 11.

[0024] After the two dual-axis hydraulic cylinders 321 in the control lifting structure 3 are working, the two extension ends of the dual-axis hydraulic cylinders 321 extend out. The upper extension end of the dual-axis hydraulic cylinders 321 is fixedly connected to the metal rod 322. The dual-axis hydraulic cylinders 321 push the box girder loading structure 1 to rise through the metal rod 322 and the L-shaped frame 323. The outer wall of the dual-axis hydraulic cylinders 321 is limited by the moving box 31 and the square block 32. The dual-axis hydraulic cylinders 321 can only move up and down. Therefore, after the bottom extension end of the dual-axis hydraulic cylinders 321 extends, the dual-axis hydraulic cylinders 321 are subjected to force and move upward as a whole. At this time, the bottom of the outer shell of the dual-axis hydraulic cylinders 321 is set at the top of the bottommost of the multiple storage cavities 33 opened in the square block 32.

[0025] When the dual-axis hydraulic cylinder 321 extends to its limit, the upward movement of the box girder loading structure 1 pauses. Because the electromagnet 317 at the bottom of the box girder loading structure 1 is magnetically attracted to the bottom of the box girder loading structure 1, the electromagnet 317 rises synchronously with the box girder loading structure 1. An electric telescopic rod 314 is fixedly connected to the bottom of the square frame 315 fixedly installed at the bottom of the electromagnet 317. Two pneumatic cylinders 313 are provided on one side of the electric telescopic rod 314, and the two pneumatic cylinders 313 are fixedly connected together. One end of the electric telescopic rod 314 is fixedly connected to the outer wall of one of the pneumatic cylinders 313. Figure 4 and Figure 5 As shown, the electromagnet 317 drives the electric telescopic rod 314 and the two pneumatic cylinders 313 to move upward synchronously via the square frame 315. After the dual-axis hydraulic cylinder 321 stops working, the pneumatic cylinder 313 moves upward to the side of the bottommost of the multiple transverse slots 34 opened on the outer side of the square block 32. These multiple transverse slots 34 pass through multiple receiving cavities 33, and the transverse slots 34 and receiving cavities 33 correspond one-to-one and are in a connected state. At this time, the electric telescopic rod 314 is controlled to work, and the working electric telescopic rod 314 pushes the two pneumatic cylinders 313 into the transverse slots 34. The two pneumatic cylinders 313 then move between the two support structures set on both sides inside the receiving cavity 33.

[0026] Subsequently, the pneumatic cylinders 313 are controlled to work. The two pneumatic cylinders 313 push the two support structures to move towards the bottom of the housing of the two dual-axis hydraulic cylinders 321. There are two second pads 310 in the support structure. A connecting beam 331 is fixedly connected between the two second pads 310 on opposite sides and away from the dual-axis hydraulic cylinders 321. So after the pneumatic cylinder 313 works to push one second pad 310, the two second pads 310 move synchronously under the action of the connecting beam 331. The two second pads 310 are simultaneously inserted into the snap-fit ​​cavity 320 opened in the motion box 31. At this time, the two second pads 310 are supported on the bottom of the housing of the dual-axis hydraulic cylinders 321. The second transmission plate 39 fixed to the second pads 310 moves synchronously into the snap-fit ​​cavity 320. The connecting beam 331 is set at the bottom of the first pad 35. The connecting beam 331 will not interfere with the first pad 35. Since the first pad 35 has two grooves 38, and the two second transmission plates 39, which are fixedly connected to the two second pads 310, are partially located inside the adjacent grooves 38, the first pad 35 is removed from its limiting position after the second transmission plate 39 moves. Since the outer wall of the second spring-type telescopic rod 36 on one side of the first pad 35 is fixedly connected to the square block 32, and the first transmission plate 37 is fixedly connected between one end of the second spring-type telescopic rod 36 and the first pad 35, the rebounding second spring-type telescopic rod 36 pushes the first pad 35 to move through the first transmission plate 37. At this time, the first pad 35 abuts against the extension part of the dual-axis hydraulic cylinder 321.

[0027] Finally, the dual-axis hydraulic cylinder 321 stops working and retracts. After the extended part of the dual-axis hydraulic cylinder 321 returns to its interior, the rebounding second spring-type telescopic rod 36 pushes one end of the first pad 35 into the snap-fit ​​cavity 320. At this time, the bottom of the dual-axis hydraulic cylinder 321 is supported by the platform formed by the first pad 35 and the two second pads 310. Subsequently, the pneumatic cylinder 313 stops working and retracts, but the second pad 310 is pressed by the outer wall of the dual-axis hydraulic cylinder 321 and cannot return to its original position. After the pneumatic cylinder 313 has retracted, the electric telescopic rod 314 retracts, driving the pneumatic cylinder 313 out of the transverse groove 34, so that the pneumatic cylinder 313 can rise synchronously with the box girder loading structure 1. Subsequently, the dual-axis hydraulic cylinder 321 is controlled to work again, and the lifting structure 3 continues the above-mentioned work process, supporting the dual-axis hydraulic cylinder 321, lifting the precast box girder on top of the box girder loading structure 1 to the appropriate position one by one. The lifting work of the precast box girder is met by a dual-axis hydraulic cylinder 321 with a short extension stroke, avoiding the situation where the multi-stage telescopic lifting structure cannot retract due to the deformation caused by supporting a heavy object after extension, and avoiding the economic losses or even personnel injuries caused by the change in structural strength of the multi-stage telescopic lifting structure after extension. The box girder loading structure 1, the slide rail structure 2, and the lifting structure 3 form a precast box girder lifting equipment with high safety.

[0028] An angle sensor 4 is fixedly connected to the top of the guide rail 21, such as... Figure 1 As shown, during the repeated lifting of the box girder loading structure 1, the angle sensor 4 continuously detects the tilt of one side of the box girder loading structure 1. This prevents the box girder loading structure 1 from tilting under the action of the precast box girder and going unnoticed for a short time. Furthermore, by dividing the precast box girder lifting into multiple stages, the precast box girder lifting equipment can stop working in time or reset the box girder loading structure 1, reducing the possibility of overall damage to the precast box girder lifting equipment and minimizing economic losses.

[0029] A third spring-type telescopic rod 311 is provided between the bottom side of the second pad 310 and the square block 32, and the outer wall of the third spring-type telescopic rod 311 is fixedly connected to the square block 32. The third transmission plate 312, which is fixedly connected to one end of the third spring-type telescopic rod 311, is fixedly connected to the second pad 310. Therefore, after the top of the second pad 310 loses the pressing limit of the dual-axis hydraulic cylinder 321, the third spring-type telescopic rod 311 rebounds and pulls the second pad 310 through the third transmission plate 312, so that the second pad 310 resets. The second pad 310 transmits power to the first pad 35 through the second transmission plate 39, which drives the first pad 35 back into the storage cavity 33, so that the dual-axis hydraulic cylinder 321 can fall and reset.

[0030] When the precast box girder is removed from the top of the box girder loading structure 1, the force on the second pad 310 is insufficient to limit the third spring-type telescopic rod 311. Therefore, when the precast box girder is removed from the top of the box girder loading structure 1, the third spring-type telescopic rod 311 automatically retracts, the dual-axis hydraulic cylinder 321 falls to reset, and the box girder loading structure 1 falls to reset.

[0031] Additionally, when the precast box girder on top of the box girder loading structure 1 cannot be pushed, the electric push rod 26 in the control slide rail structure 2 is activated, and the electromagnet 317 stops working and is no longer attracted and fixed to the box girder loading structure 1. The activated electric push rod 26 pulls the connecting plate 25, which is fixedly connected at one end, to move. Multiple sets of clamping plates 23 are provided on one side of the connecting plate 25. Each set of clamping plates 23 consists of multiple clamping plates 23. A first spring-type telescopic rod 24 is fixedly connected between one side of the clamping plate 23 and the connecting plate 25. Therefore, the connecting plate 25 pulls the clamping plate 23 to move through the first spring-type telescopic rod 24, causing the clamping plate 23 to enter the inner groove 22, and the motion box 31 loses its limit. Then, the bolt 326 is rotated and removed, so that the fixation between the L-shaped frame 323 and the top box 11 is removed. At this time, the vehicle reverses and pushes the lifting structure 3, so that the lifting structure 3 moves inside the slide rail structure 2. The multiple small balls 324 fixedly connected inside the L-shaped frame 323 are in contact with the top box 11. The small balls 324 reduce the resistance of the movement of the L-shaped frame 323. When the box girder loading structure 1 is blocked and limited at the end away from the vehicle, the box girder loading structure 1 enters the vehicle loading position. The box girder loading structure 1 and the precast box girder on the top of the box girder loading structure 1 are loaded onto the vehicle together, so as to avoid friction and wear between the precast box girder and the vehicle, and to avoid the quality degradation of the precast box girder caused by the transportation process.

[0032] An inner groove 22 is provided on both sides inside the guide rail 21. Multiple sets of clamping plates 23 are provided inside the inner groove 22. Therefore, a lifting structure 3 can be set between two sets of clamping plates 23 that are symmetrically arranged. After multiple lifting structures 3 are placed inside the guide rail 21, the electric push rod 26 is controlled. The working electric push rod 26 pushes multiple clamping plates 23 through the connecting plate 25 and the first spring-type telescopic rod 24. When multiple clamping plates 23 are inserted between multiple side support plates 328 that are fixedly connected to the outside of the motion box 31, the movement of the lifting structure 3 along the length direction of the guide rail 21 is limited.

[0033] If the clamping plate 23 abuts against the side support plate 328, the first spring-loaded telescopic rod 24 retracts, which will not affect the installation and limiting operation of the other lifting structures 3 by the clamping plates 23 on both sides. If the lifting structure 3 moves, after the clamping plate 23 aligns with the space between the two adjacent side support plates 328, the rebounding first spring-loaded telescopic rod 24 pushes the clamping plate 23 between the two side support plates 328, limiting the movement of the lifting structure 3. The operator only needs to move the lifting structure 3 roughly between the two symmetrically arranged clamping plates 23 to complete the installation of the lifting structure 3, shortening the installation time of the lifting structure 3. Furthermore, the outer wall of the first spring-type telescopic rod 24 can move through the guide rail 21. A limiting vertical plate 28 is provided between two adjacent clamping plates 23. The limiting vertical plate 28, which is located inside the inner groove 22, is fixedly connected to the guide rail 21. Therefore, the limiting vertical plate 28 supports and limits the clamping plate 23, preventing the force exerted by the lifting structure 3 on the clamping plate 23 from directly acting on the first spring-type telescopic rod 24, thus protecting the first spring-type telescopic rod 24.

[0034] Other, such as Figure 12 As shown, multiple bottom support plates 327 are fixedly connected to the bottom of the motion box 31. The bottom of the bottom support plate 327 contacts the bottom of the inner cavity of the guide rail 21 to reduce the friction generated by the movement of the lifting structure 3.

[0035] Other, such as Figure 2 As shown, a support frame 14 is fixedly connected to the bottom of the inner cavity of the top box 11. The outer bottom of multiple support rollers 12 are respectively set inside multiple arc-shaped grooves 15 opened in the support frame 14. The support frame 14 supports and limits the support rollers 12. Multiple drag-reducing shafts 16 are set inside the arc-shaped grooves 15. The drag-reducing shafts 16, which are rotatably connected to the support frame 14, support the support rollers 12, reduce the resistance generated when the support rollers 12 rotate, and prevent the support rollers 12 from breaking under force, thus ensuring the service life of the precast box girder lifting equipment.

[0036] Other, such as Figure 3 and Figure 13 As shown, two sliding grooves 330 are provided on both sides inside the motion box 31, and the T-shaped plate 329 provided inside the sliding groove 330 is fixedly connected to the adjacent dual-axis hydraulic cylinder 321. The T-shaped plate 329 limits the dual-axis hydraulic cylinder 321, so that the dual-axis hydraulic cylinder 321 can only move up and down.

[0037] Other, such as Figure 4As shown, a limiting frame 316 is fitted on the top of the outer side of the square frame 315, and the limiting frame 316 is fixedly connected to the motion box 31. The limiting frame 316 limits the up and down movement of the square frame 315. The square frame 315, which is equipped with an electric telescopic rod 314 at the bottom and an electromagnet 317 at the top, cannot completely pass through the limiting frame 316, thus ensuring the stability of the limiting frame 316.

[0038] Other, such as Figure 3 and Figure 4 As shown, a second reserved slot 319 is provided on the outside of the motion box 31, and a first reserved slot 318 is provided on one side of the square block 32. The first reserved slot 318 and the second reserved slot 319 provide a channel for the movement of the pneumatic cylinder 313, ensuring that the pneumatic cylinder 313 enters the storage cavity 33.

[0039] Other, such as Figure 3 As shown, long plates 110 are provided on both sides of the top of the top box 11. Multiple L-shaped fixing plates 18 are fixedly connected to both sides of the top of the top box 11. A hydraulic cylinder 19 is fixedly connected inside the L-shaped fixing plate 18. One end of the hydraulic cylinder 19 is fixedly connected to the adjacent long plate 110. Therefore, by controlling the operation of the hydraulic cylinder 19, the long plate 110 can be pushed to move on the top of the top box 11, thereby controlling the position of the precast box girder loaded on the top of the box girder loading structure 1 and adapting to the needs of lifting and loading slender precast box girders.

Claims

1. A lifting device for precast box girders used in the installation of drop-off platforms, including a slide rail structure (2), characterized in that: An angle sensor (4) is provided on the top of the slide rail structure (2), and multiple lifting structures (3) are provided inside the slide rail structure (2). The top of the multiple lifting structures (3) supports a box girder loading structure (1). The box girder loading structure (1) includes a top box (11), and multiple threaded holes (17) are provided on both sides of the top box (11). The lifting structure (3) includes a motion box (31), a square block (32) is fixedly connected to the middle of the inner cavity of the motion box (31), a double-axis hydraulic cylinder (321) is provided on both sides of the square block (32), a plurality of storage cavities (33) are opened on one side of the square block (32), a snap-fit ​​cavity (320) is provided on both sides of the storage cavity (33), the snap-fit ​​cavity (320) is opened on the inner cavity of the motion box (31), and a support structure is provided on both sides inside the storage cavity (33); The support structure includes two second pads (310), and a third spring-type telescopic rod (311) is provided between the bottom of one side of the two second pads (310) and the square block (32). A connecting beam (331) is fixedly connected between the opposite sides of the two second pads (310) away from the dual-axis hydraulic cylinder (321). A first pad (35) is provided between the two second pads (310). A second spring-type telescopic rod (36) is provided between the first pad (35) and the motion box (31). Two second transmission plates (39) are provided on the side of the first pad (35) near the dual-axis hydraulic cylinder (321). The two second transmission plates (39) are fixedly connected to the two second pads (310) respectively. A square frame (315) is provided between the square block (32) and the box girder loading structure (1). An electric telescopic rod (314) is fixedly connected to the bottom of the square frame (315). Two pneumatic cylinders (313) are provided on one side of the electric telescopic rod (314). The two pneumatic cylinders (313) are located between the two support structures. An electromagnet (317) is fixedly connected to the top of the square frame (315). The electromagnet (317) is magnetically attracted to the bottom of the box girder loading structure (1).

2. The lifting equipment for the precast box girder used in the drop-off platform installation according to claim 1, characterized in that: The top box (11) is provided with multiple support rollers (12), and each of the multiple support rollers (12) is fixedly connected with an installation shaft (13). The installation shaft (13) is rotatably connected to the inside of the top box (11), and one end of the installation shaft (13) extends to the outside of the top box (11). Multiple L-shaped fixing plates (18) are fixedly connected to both sides of the top of the top box (11). A hydraulic cylinder (19) is fixedly connected inside the L-shaped fixing plate (18). Long plates (110) are provided on both sides of the top of the top of the top box (11). One end of the hydraulic cylinder (19) is fixedly connected to the adjacent long plate (110).

3. The lifting device for the precast box girder used in the drop-off platform installation according to claim 2, characterized in that: The bottom of the inner cavity of the top box (11) is fixedly connected to a support frame (14). The top of the support frame (14) is provided with multiple arc-shaped grooves (15). The bottom of the outer side of multiple support rollers (12) is respectively set inside the multiple arc-shaped grooves (15). Multiple drag-reducing shafts (16) are provided inside the arc-shaped grooves (15). The drag-reducing shafts (16) are rotatably connected to the support frame (14).

4. The lifting equipment for the precast box girder used in the drop-off platform installation according to claim 1, characterized in that: The second spring-type telescopic rod (36) is fixedly connected to a first transmission plate (37) at one end. The first transmission plate (37) is fixedly connected to a first pad (35). The outer wall of the second spring-type telescopic rod (36) is fixedly connected to a square block (32). The outer wall of the third spring-type telescopic rod (311) is fixedly connected to a square block (32). The third spring-type telescopic rod (311) is fixedly connected to a third transmission plate (312) at one end. The third transmission plate (312) is fixedly connected to a second pad (310).

5. The lifting device for the precast box girder used in the drop-off platform installation according to claim 1, characterized in that: The first pad (35) has two grooves (38), the second transmission plate (39) is partially disposed inside the grooves (38), and the connecting beam (331) is disposed at the bottom of the first pad (35).

6. The lifting device for the precast box girder used in the drop-off platform installation according to claim 1, characterized in that: The square block (32) has multiple transverse grooves (34) on its outer side, and the multiple transverse grooves (34) pass through multiple storage cavities (33) respectively. The two pneumatic cylinders (313) are both located inside the transverse grooves (34) and are fixedly connected together. One end of the electric telescopic rod (314) is fixedly connected to the outer wall of one of the pneumatic cylinders (313).

7. The lifting device for the precast box girder used in the drop-off platform installation according to claim 1, characterized in that: A limiting frame (316) is fitted on the top of the outer side of the square frame (315). The limiting frame (316) is fixedly connected to the motion box (31). A second reserved slot (319) is opened on the outer side of the motion box (31). A first reserved slot (318) is opened on one side of the square block (32). The first reserved slot (318) is located on one side of the second reserved slot (319).

8. The lifting device for the precast box girder used in the drop-off platform installation according to claim 1, characterized in that: The extension end of the dual-axis hydraulic cylinder (321) is fixedly connected to a metal rod (322), and the top of the metal rod (322) is fixedly connected to an L-shaped frame (323). Multiple small balls (324) are fixedly connected inside the L-shaped frame (323). Two sliding grooves (330) are opened on both sides of the inside of the motion box (31). A T-shaped plate (329) is provided inside the sliding groove (330). The T-shaped plate (329) is fixedly connected to the adjacent dual-axis hydraulic cylinder (321). Nuts (325) are fixedly connected on both sides of the L-shaped frame (323). Bolts (326) are provided inside the nuts (325).

9. The lifting device for the precast box girder used in the drop-off platform installation according to claim 1, characterized in that: The slide rail structure (2) includes a guide rail (21), an angle sensor (4) is fixedly connected to the top of the guide rail (21), and an inner groove (22) is provided on both sides of the guide rail (21). Multiple sets of clamping plates (23) are provided inside the inner groove (22). Each set of clamping plates (23) is composed of multiple clamping plates (23). A first spring-type telescopic rod (24) is fixedly connected to one side of the clamping plate (23). A connecting plate (25) is fixedly connected between multiple first spring-type telescopic rods (24). An electric push rod (26) is fixedly connected to one side of the connecting plate (25). A protective shell (27) is fixedly connected to one side of the electric push rod (26). The protective shell (27) is fixedly connected to the outside of the guide rail (21). The outer wall of the first spring-type telescopic rod (24) penetrates the guide rail (21).

10. The lifting device for the precast box girder used in the drop-off platform installation according to claim 9, characterized in that: A limiting vertical plate (28) is provided between two adjacent card plates (23). The limiting vertical plate (28) is located inside the inner groove (22) and is fixedly connected to the guide rail (21). Multiple side support plates (328) are fixedly connected to both sides of the motion box (31), and multiple bottom support plates (327) are fixedly connected to the bottom of the motion box (31).

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