A lifting device for road and bridge construction

Abstract

The present application discloses a lifting device for road and bridge construction, which belongs to the field of road and bridge construction equipment. The key points of its technical solution are as follows: it comprises a gantry; a lifting device comprises a driving assembly, a rotating shaft, a plurality of lifting groups and a hook. The driving assembly is connected to the gantry, the rotating shaft is connected to the driving assembly, the lifting group comprises a roller and a lifting rope, the roller is sleeved on the rotating shaft, the lifting rope is wound around the roller, and the lifting rope is fixedly connected to the hook; a guiding device is connected to the gantry, each lifting group is correspondingly provided with a guiding device, the guiding device comprises a moving wheel, a control assembly and a fixed wheel, the moving wheel is connected to the gantry through the control assembly, the moving wheel is in sliding contact with the lifting rope, and can guide the direction of the lifting rope, the fixed wheel is connected to the gantry, the lifting rope is in sliding contact with the fixed wheel, and is used to guide the lifting rope; an auxiliary device is connected to the gantry, the auxiliary device is connected to the hook, and can assist the lifting device in lifting objects, so as to achieve the effect of improving the lifting stability and safety of the objects.

Description

Technical Field

[0001] The present application relates to the field of road and bridge construction equipment, and in particular to a lifting device for road and bridge construction. Background Art

[0002] In the field of road and bridge construction, lifting devices are one of the key equipment to ensure construction progress and quality. These devices are widely used in bridge construction, road maintenance and other infrastructure projects. They not only need to have strong load-bearing capacity, but also must be able to work efficiently and stably in various complex and harsh construction environments. With the continuous expansion of engineering construction and the continuous advancement of technology, the requirements for lifting devices are also constantly increasing, especially in terms of improving accuracy and operational stability. In modern engineering practice, more and more construction units have begun to pay attention to the functional diversification and performance optimization of lifting devices to adapt to more complex and diverse construction needs.

[0003] The working characteristic of the lifting device is intermittent movement, that is, the actions of picking up materials, moving, unloading, etc. are performed alternately in one cycle. Existing lifting devices generally use a single rope to lift heavy objects. However, during the construction of roads and bridges, the existing lifting devices have the problem of unstable lifting when lifting heavy objects due to the single rope design, and the motor is prone to overheating under long-term high-load operation, resulting in an increase in the equipment failure rate. These problems not only affect the construction efficiency, but also increase safety hazards. Therefore, there is an urgent need for a lifting device that can improve the stability and safety of object lifting. Summary of the invention

[0004] In order to improve the stability and safety of object lifting, the present invention provides a lifting device for road and bridge construction.

[0005] The present invention provides a lifting device for road and bridge construction that adopts the following technical solution: A lifting device for road and bridge construction, comprising a gantry; A lifting device is arranged on the top of the gantry, and the lifting device includes a driving assembly, a rotating shaft, a lifting group and a hook. The driving assembly is connected to the gantry, the rotating shaft is connected to the driving assembly, and the lifting group is provided with a plurality of lifting groups. The lifting group includes a roller and a lifting rope. The roller is sleeved on the rotating shaft, the lifting rope is wound around the roller, and one end of the lifting rope is fixedly connected to the hook; A guide device, each of the lifting groups is provided with the guide device, the guide device comprises a moving wheel, a control assembly and a fixed wheel, the moving wheel is connected to the gantry through the control assembly, the control assembly can drive the moving wheel to move along the length direction of the roller, the moving wheel is in sliding contact with the lifting rope, and can guide the direction of the lifting rope, the fixed wheel is connected to the gantry, the lifting rope is in sliding contact with the fixed wheel, and is used to guide the lifting rope that is separated from the moving wheel; An auxiliary device is connected to the gantry, and the auxiliary device is connected to the hook, and can assist the lifting device in lifting an object.

[0006] By adopting the above technical solution, during use, when it is necessary to lift heavy objects, the drive assembly is started to drive the rotating shaft to rotate, so that multiple lifting groups work at the same time. The rollers in each lifting group rotate accordingly, causing the lifting rope to be wound or released along the rollers, thereby driving the hook to rise or fall. At the same time, the moving wheels and fixed wheels in the guide device work together to ensure the correct direction of the lifting rope and reduce the possibility of it deviating from the track or getting entangled. The auxiliary device provides additional support by connecting to the hook to enhance the stability and safety of the lifting process. The auxiliary device works together with multiple lifting groups to effectively improve the working efficiency and reliability of the lifting device, and solves the instability and safety risks that are prone to occur in traditional single lifting groups under heavy loads.

[0007] At the same time, the control component drives the moving wheel to move along the length of the roller, ensuring that the lifting rope is always in the best tension state, reducing the possibility of safety hazards caused by relaxation. This design not only improves the lifting efficiency, but also enhances the stability and safety of the system.

[0008] Preferably, the control component includes a reciprocating screw, a mounting block, a slider, a first synchronous wheel, a second synchronous wheel and a synchronous belt. The reciprocating screw is horizontally arranged, the reciprocating screw is connected to the gantry through the mounting block, the slider is sleeved on the reciprocating screw and is threadedly connected to the reciprocating screw, the slider is slidingly connected to the gantry, and the moving wheel is rotatably connected to the slider; the first synchronous wheel is sleeved on the reciprocating screw, the second synchronous wheel is sleeved on the rotating shaft, the synchronous belt is sleeved on the first synchronous wheel and the second synchronous wheel, and abuts against both the first synchronous wheel and the second synchronous wheel to realize the synchronous movement of the reciprocating screw and the rotating shaft.

[0009] By adopting the above technical solution, the synchronous movement of the moving wheel and the rotating shaft is realized. Specifically, the synchronous belt connection between the reciprocating screw and the rotating shaft ensures that when the rotating shaft rotates, the reciprocating screw also rotates synchronously, thereby driving the slider to move horizontally along the reciprocating screw, and then the moving wheel moves accurately along the length direction of the lifting rope, effectively improving the guiding accuracy and stability of the lifting rope. At the same time, this structural design simplifies the complexity of the control system, reduces the failure rate, and improves the working efficiency and safety of the entire lifting device.

[0010] Preferably, it also includes a limiting device, the lifting group is provided with two groups, the two rollers are arranged at intervals along the length direction of the rotating shaft, the two lifting ropes are connected to the limiting device, the hook is arranged below the limiting device and connected to the limiting device, and the limiting device can prevent the two lifting ropes from entangled with each other.

[0011] By adopting the above technical solution, the lifting device for road and bridge construction is provided with a limit device, which reduces the situation where the two lifting ropes are entangled with each other during use, and improves the safety and stability of the lifting process. At the same time, the two lifting ropes are respectively connected to the limit device, and the guiding effect of the limit device ensures the smooth operation of the lifting rope, thereby improving the working efficiency and reliability of the overall device.

[0012] Preferably, the limiting device includes a lifting plate, a reinforcement rod and a limiting assembly, the lifting plate is provided with a through hole on the top, the lifting rope passes through the through hole, one end of the reinforcement rod is connected to the lifting plate, and the other end is slidably connected to the gantry; the limiting assembly includes a limiting frame, a first wheel, a second wheel, a third wheel and a fourth wheel, the limiting frame is connected to the lifting plate and erected above the through hole, the first wheel, the second wheel, the third wheel and the fourth wheel are all rotatably connected to the limiting frame, one lifting rope passes between the first wheel and the second wheel, and the other lifting rope passes between the third wheel and the fourth wheel.

[0013] By adopting the above technical solution, the limit device reduces the possibility of the two lifting ropes getting entangled with each other, ensuring the safety and stability of the lifting process. The through-hole design on the lifting plate makes the path of the lifting rope clearer, reducing the risk of accidents caused by unclear paths. The sliding connection of the reinforcement rod enhances the flexibility and adaptability of the entire device, and can maintain a good working condition under different working conditions. The multiple wheel design in the limit assembly further improves the guiding accuracy of the lifting rope, ensures the smooth operation of the lifting rope during the lifting process, reduces wear, and extends the service life of the equipment.

[0014] Preferably, the limiting device further comprises a rotating column, a first end of which passes through the through hole and is rotatably connected to the lifting plate, and a plurality of hooks are provided, and the plurality of hooks are all connected to the rotating column.

[0015] By adopting the above technical solution, the setting of the rotating column allows the lifting rope to rotate freely during the lifting process, reducing the possibility of equipment failure or damage caused by the twisting of the lifting rope, and improving the stability and safety of the equipment. At the same time, the second end of the rotating column is fixedly connected to the hook, which improves the balance during the lifting process, reduces the shaking of the hoisted object, and improves the work efficiency and safety.

[0016] Preferably, the gantry includes a first support frame, a second support frame and a top frame, the first end of the top frame is fixedly connected to the top of the first support frame, and the second end of the top frame is fixedly connected to the top of the second support frame; the reinforcement rod is slidably connected to the first support frame, and one end of the auxiliary device is connected to the first support frame, and the other end is connected to the reinforcement rod.

[0017] By adopting the above technical solution, the first support frame, the second support frame and the top frame are stable and reliable, and can effectively support the entire lifting device, ensuring the overall rigidity and stability of the gantry. The reinforcement rod is slidably connected to the first support frame and can adjust its position during the lifting process. At the same time, the auxiliary device can assist the lifting device in lifting heavy objects through the reinforcement rod, thereby improving the lifting efficiency and safety.

[0018] Preferably, the auxiliary device includes a winch and a rotating wheel, the winch is fixedly connected to the bottom of the first support frame, the rotating wheel is sleeved on the rotating shaft and fixedly connected to the rotating shaft, and the rope of the winch passes through the rotating wheel and is fixedly connected to the reinforcement rod.

[0019] By adopting the above technical solution, the winch is fixedly connected to the bottom of the first support frame, ensuring the stability and reliability of the winch; the wheel is sleeved on the rotating shaft and fixedly connected to the rotating shaft, so that the rope of the winch can transmit power through the wheel, thereby improving the lifting efficiency and stability; the rope of the winch passes through the wheel and is fixedly connected to the reinforcement rod, thereby achieving effective tightening of the reinforcement rod and enhancing the structural strength and safety of the entire device.

[0020] Preferably, the reinforcement rods are arranged on both sides of the lifting plate, and the auxiliary devices are arranged in multiple groups, and each of the reinforcement rods is connected to the auxiliary device.

[0021] By adopting the above technical solution, reinforcement rods are arranged on both sides of the lifting plate, which can effectively enhance the stability of the lifting plate and reduce the possibility of tilting or shaking due to uneven force during the lifting process. Multiple sets of auxiliary devices are connected to each reinforcement rod respectively, which can further improve the safety and reliability of the lifting process, ensure the smooth rise of the lifted object, and reduce the occurrence of accidents.

[0022] Preferably, the driving assembly includes a motor, a gear and a ring gear, the motor is fixedly connected to the gantry, the gear is connected to the motor, the ring gear is sleeved on the rotating shaft, and the ring gear is meshed with the gear to drive the rotating shaft to rotate.

[0023] By adopting the above technical solution, during use, after the motor is started, the gear and the gear ring are meshed and driven to rotate the shaft. The rotation of the shaft drives the roller to rotate, thereby winding or releasing the lifting rope to achieve the lifting and lowering of the hook.

[0024] In summary, the present invention has the following beneficial effects: During use, when heavy objects need to be lifted, the drive assembly starts, driving the rotating shaft to rotate, so that multiple lifting groups work at the same time. The rollers in each lifting group rotate accordingly, causing the lifting rope to be wound or released along the rollers, thereby driving the hook to rise or fall. At the same time, the moving wheels and fixed wheels in the guide device work together to ensure the correct direction of the lifting rope and reduce the possibility of it deviating from the track or getting entangled. The auxiliary device provides additional support by connecting to the hook, enhancing the stability and safety of the lifting process. The auxiliary device works together with multiple lifting groups to effectively improve the working efficiency and reliability of the lifting device, solving the instability and safety risks that are prone to occur in traditional single lifting groups under heavy loads. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 It is a schematic diagram of the overall structure of a lifting device used in road and bridge construction.

[0026] Figure 2 It is a structural schematic diagram of the lifting device.

[0027] Figure 3 It is a structural schematic diagram of the guide device.

[0028] Figure 4 It is a structural schematic diagram of the limit device.

[0029] Figure 5 It is a structural schematic diagram of the auxiliary device.

[0030] Description of reference numerals: 1. Gantry; 11. First support frame; 12. Second support frame; 13. Top frame; 2. Lifting device; 21. Driving assembly; 211. Motor; 212. Gear; 213. Gear ring; 22. Rotating shaft; 23. Lifting group; 231. Roller; 232. Lifting rope; 24. Hook; 3. Guide device; 31. Moving wheel; 32. Control assembly; 321. Reciprocating screw; 322. Mounting block; 32 3. Slider; 324. First synchronous wheel; 325. Second synchronous wheel; 326. Synchronous belt; 33. Fixed wheel; 4. Limiting device; 41. Lifting plate; 411. Through hole; 42. Reinforcement rod; 43. Limiting assembly; 431. Limiting frame; 432. First wheel; 433. Second wheel; 434. Third wheel; 435. Fourth wheel; 44. Rotating column; 5. Auxiliary device; 51. Winch; 52. Rotating wheel. DETAILED DESCRIPTION

[0031] In order to enable technicians in this field to better understand the technical solutions in this specification, the technical solutions in the embodiments of this specification will be clearly and completely described below in conjunction with the drawings in the embodiments of this specification. Obviously, the described embodiments are only part of the embodiments of this application, not all of the embodiments.

[0032] In the description of the embodiments of the present application, the meaning of the term "multiple" refers to two or more. For example, multiple systems refer to two or more systems, and multiple screen terminals refer to two or more screen terminals. In addition, the terms "first" and "second" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance or implicitly indicating the indicated technical features. Thus, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. The terms "include", "comprise", "have" and their variations all mean "including but not limited to", unless otherwise specifically emphasized.

[0033] A lifting device for road and bridge construction, referring to Figure 1 , Figure 2 and Figure 3, including a gantry 1, a lifting device 2, a guide device 3 and an auxiliary device 5. The lifting device 2 is arranged on the top of the gantry 1, and the lifting device 2 includes a driving assembly 21, a rotating shaft 22, a lifting group 23 and a hook 24. The driving assembly 21 is connected to the gantry 1, and the rotating shaft 22 is connected to the driving assembly 21. There are multiple lifting groups 23, and the lifting groups 23 include a roller 231 and a lifting rope 232. The roller 231 is sleeved on the rotating shaft 22, the lifting rope 232 is wound around the roller 231, and one end of the lifting rope 232 is fixedly connected to the hook 24. Each lifting group 23 is correspondingly provided with a guide device 3. The guide device 3 includes a moving wheel 31, a control assembly 32 and a fixed wheel 33. The moving wheel 31 is connected to the gantry 1 through the control assembly 32. The control assembly 32 can drive the moving wheel 31 to move along the length direction of the roller 231. The moving wheel 31 slides and abuts against the lifting rope 232, and can guide the direction of the lifting rope 232. The fixed wheel 33 is connected to the gantry 1, and the lifting rope 232 is slidably abutted against the fixed wheel 33 to guide the lifting rope 232 that is separated from the moving wheel 31. The auxiliary device 5 is connected to the gantry 1, and the auxiliary device 5 is connected to the hook 24, which can assist the lifting device 2 in lifting objects.

[0034] During use, when a heavy object needs to be lifted, the driving assembly 21 is started, driving the rotating shaft 22 to rotate, so that multiple lifting groups 23 work simultaneously. The roller 231 in each lifting group 23 rotates accordingly, so that the lifting rope 232 is wound or released along the roller 231, thereby driving the hook 24 to rise or fall. At the same time, the moving wheel 31 and the fixed wheel 33 in the guide device 3 work together to ensure the correct direction of the lifting rope 232 and reduce the possibility of it deviating from the track or getting entangled. The auxiliary device 5 is connected to the hook 24 to provide additional support force and enhance the stability and safety of the lifting process. The instability and safety risk problems that are prone to occur in the traditional single lifting group 23 under heavy weight loads are solved.

[0035] Reference Figure 1 The gantry 1 includes a first support frame 11, a second support frame 12 and a top frame 13. The first end of the top frame 13 is fixedly connected to the top of the first support frame 11, and the second end of the top frame 13 is fixedly connected to the top of the second support frame 12.

[0036] Reference Figure 1 and Figure 2 In this embodiment, two lifting groups 23 are provided. Two rollers 231 are arranged at intervals along the length direction of the rotating shaft 22. Multiple lifting groups 23 work simultaneously to improve the stability of the device.

[0037] Reference Figure 1 and Figure 3The control assembly 32 includes a reciprocating screw 321, a mounting block 322, a slider 323, a first synchronous wheel 324, a second synchronous wheel 325 and a synchronous belt 326. The reciprocating screw 321 is horizontally arranged, and its length direction is parallel to the length direction of the rotating shaft 22. Both ends of the reciprocating screw 321 are fixedly connected to the mounting block 322, and the mounting block 322 is fixedly connected to the top frame 13. The slider 323 is sleeved on the reciprocating screw 321 and is threadedly connected to the reciprocating screw 321, and the bottom of the slider 323 is slidably connected. The axis of the moving wheel 31 is vertically arranged, and the moving wheel 31 is rotatably connected to the top of the slider 323.

[0038] Reference Figure 3 The first synchronous wheel 324 is sleeved on the reciprocating screw 321 and fixedly connected to the reciprocating screw 321. The second synchronous wheel 325 is sleeved on the rotating shaft 22 and fixedly connected to the rotating shaft 22. The synchronous belt 326 is sleeved on the first synchronous wheel 324 and the second synchronous wheel 325, and abuts against the first synchronous wheel 324 and the second synchronous wheel 325 to achieve synchronous movement of the reciprocating screw 321 and the rotating shaft 22.

[0039] The synchronous belt 326 connection between the reciprocating screw 321 and the rotating shaft 22 ensures that when the rotating shaft 22 rotates, the reciprocating screw 321 also rotates synchronously, thereby driving the slider 323 to move horizontally along the reciprocating screw 321, and then the moving wheel 31 moves along the length direction of the lifting rope 232, ensuring that the lifting rope 232 is always in the best tension state, reducing the possibility of safety hazards caused by relaxation. This design not only improves the lifting efficiency, but also enhances the stability and safety of the system.

[0040] Reference Figure 1 and Figure 3 The axis of the fixed wheel 33 is set horizontally, the fixed wheel 33 is fixedly connected to the top frame 13, the lifting rope 232 passes through the top of the fixed wheel 33, and passes through the top frame 13 to extend to the bottom of the top frame 13, guiding the lifting rope 232 and reducing the possibility of interference and wear between the lifting rope 232 and the top frame 13.

[0041] Reference Figure 4 , and also includes a limiting device 4. The limiting device 4 includes a lifting plate 41, a reinforcing rod 42, a limiting assembly 43 and a rotating column 44. The lifting plate 41 is in a rectangular parallelepiped shape and is horizontally arranged. Two reinforcing rods 42 are provided, and the two reinforcing rods 42 are respectively arranged on both sides of the lifting plate 41, and the two reinforcing rods 42 are fixedly connected to the lifting plate 41.

[0042] Reference Figure 1 and Figure 4 The two reinforcing rods 42 correspond to the first support frame 11 and the second support frame 12 one by one. The reinforcing rod 42 corresponding to the first support frame 11 is slidably connected to the first support frame 11. The reinforcing rod 42 corresponding to the second support frame 12 is slidably connected to the second support frame 12.

[0043] Reference Figure 4 The limiting assembly 43 includes a limiting frame 431, a first wheel 432, a second wheel 433, a third wheel 434 and a fourth wheel 435. A through hole 411 is provided on the lifting plate 41, and the lifting plate 41 is mounted above the through hole 411. The axes of the first wheel 432, the second wheel 433, the third wheel 434 and the fourth wheel 435 are all horizontally arranged and are all rotatably connected to the lifting plate 41.

[0044] Reference Figure 4 The first wheel 432 and the second wheel 433 form a first wheel 432 group, the third wheel 434 and the fourth wheel 435 form a second wheel 433 group, and the two lifting ropes 232 correspond to the first wheel 432 group and the second wheel 433 group. The lifting rope 232 corresponding to the first wheel 432 group passes between the first wheel 432 and the second wheel 433, and the lifting rope 232 corresponding to the second wheel 433 group passes between the third wheel 434 and the fourth wheel 435, so as to limit the two lifting ropes 232.

[0045] The design of the first wheel 432, the second wheel 433, the third wheel 434 and the fourth wheel 435 further improves the guiding accuracy of the lifting rope 232, ensures the smooth operation of the lifting rope 232 during the lifting process, reduces wear and tear, and extends the service life of the equipment.

[0046] Reference Figure 4 The rotating column 44 is vertically arranged, and the top end of the rotating column 44 is arranged in the through hole 411 and is rotatably connected to the lifting plate 41. A plurality of hooks 24 are arranged, and in this embodiment, three hooks 24 are arranged. The three hooks 24 are all fixedly connected to the rotating column 44.

[0047] The provision of the rotating column 44 allows the lifting rope 232 to rotate freely during the lifting process, reducing the possibility of equipment failure or damage caused by the twisting of the lifting rope 232, and improving the stability and safety of the equipment.

[0048] Reference Figure 1 and Figure 5 , there are two groups of auxiliary devices 5, and the two groups of auxiliary devices 5 correspond to the first support member and the second support frame 12 one by one. The two groups of auxiliary devices 5 have the same structure, so only the first auxiliary device 5 is described in detail in this example.

[0049] Reference Figure 5 The auxiliary device 5 includes a winch 51 and a rotating wheel 52. The winch 51 is fixedly connected to the bottom of the first support frame 11. The rotating wheel 52 is sleeved on the rotating shaft 22. The rope of the winch 51 passes through the rotating wheel 52 and is fixedly connected to the corresponding reinforcement rod 42.

[0050] The rope of the winch 51 passes through the rotating wheel 52 and is fixedly connected to the reinforcement rod 42, thereby effectively tightening the reinforcement rod 42 and enhancing the structural strength and safety of the entire device.

[0051] The use principle of the present application is as follows: during use, when a heavy object needs to be lifted, the driving assembly 21 is started, driving the rotating shaft 22 to rotate, so that multiple lifting groups 23 work simultaneously. The roller 231 in each lifting group 23 rotates accordingly, so that the lifting rope 232 is wound or released along the roller 231, driving the rotating column 44 to rise or fall, and then driving the hook 24 to rise or fall. At the same time, the moving wheel 31 and the fixed wheel 33 in the guide device 3 work together to ensure the correct direction of the lifting rope 232 and reduce the possibility of it deviating from the track or getting entangled. The auxiliary device 5 provides additional support to the rotating column 44 through the lifting plate 41 and the reinforcement plate, thereby enhancing the stability and safety of the lifting process.

[0052] The two winches 51 and the two lifting groups 23 work together and cooperate with each other to share the weight of the object, reduce the load of the motor 211, effectively improve the working efficiency and reliability of the lifting device, and improve the stability and safety of object lifting.

[0053] The embodiments of this specific implementation method are all preferred embodiments of the present invention, and are not intended to limit the protection scope of the present invention. Therefore, any equivalent changes made based on the structure, shape, and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A lifting device for road and bridge construction, characterized in that: comprising a gantry (1); A lifting device (2) is arranged on the top of the gantry (1), the lifting device (2) comprises a driving assembly (21), a rotating shaft (22), a lifting group (23) and a hook (24), the driving assembly (21) is connected to the gantry (1), the rotating shaft (22) is connected to the driving assembly (21), a plurality of lifting groups (23) are provided, the lifting group (23) comprises a roller (231) and a lifting rope (232), the roller (231) is sleeved on the rotating shaft (22), the lifting rope (232) is wound around the roller (231), and one end of the lifting rope (232) is fixedly connected to the hook (24); A guide device (3), each of the lifting groups (23) is provided with the guide device (3), the guide device (3) comprising a moving wheel (31), a control component (32) and a fixed wheel (33), the moving wheel (31) being connected to the gantry (1) via the control component (32), the control component (32) being able to drive the moving wheel (31) to move along the length direction of the roller (231), the moving wheel (31) being in sliding contact with the lifting rope (232) and being able to guide the direction of the lifting rope (232), the fixed wheel (33) being connected to the gantry (1), the lifting rope (232) being in sliding contact with the fixed wheel (33) and being used to guide the lifting rope (232) that is separated from the moving wheel (31); An auxiliary device (5) is connected to the gantry (1); the auxiliary device (5) is connected to the hook (24) and can assist the lifting device (2) in lifting an object.

2. A lifting device for road and bridge construction according to claim 1, characterized in that: The control assembly (32) comprises a reciprocating screw (321), a mounting block (322), a slider (323), a first synchronous wheel (324), a second synchronous wheel (325) and a synchronous belt (326); the reciprocating screw (321) is arranged horizontally; the reciprocating screw (321) is connected to the gantry (1) via the mounting block (322); the slider (323) is sleeved on the reciprocating screw (321) and is threadedly connected to the reciprocating screw (321); the slider (323) is connected to the gantry (1) ) is slidably connected, the moving wheel (31) is rotationally connected to the slider (323); the first synchronous wheel (324) is sleeved on the reciprocating screw (321), the second synchronous wheel (325) is sleeved on the rotating shaft (22), the synchronous belt (326) is sleeved on the first synchronous wheel (324) and the second synchronous wheel (325), and is in contact with both the first synchronous wheel (324) and the second synchronous wheel (325), so as to realize the synchronous movement of the reciprocating screw (321) and the rotating shaft (22).

3. A lifting device for road and bridge construction according to claim 1, characterized in that: It also includes a limiting device (4), the lifting group (23) is provided with two groups, the two rollers (231) are arranged at intervals along the length direction of the rotating shaft (22), the two lifting ropes (232) are connected to the limiting device (4), the hook (24) is arranged below the limiting device (4) and is connected to the limiting device (4), and the limiting device (4) can prevent the two lifting ropes (232) from being entangled with each other.

4. A lifting device for road and bridge construction according to claim 3, characterized in that: The limiting device (4) comprises a lifting plate (41), a reinforcing rod (42) and a limiting assembly (43); a through hole (411) is provided on the top of the lifting plate (41); the lifting rope (232) passes through the through hole (411); one end of the reinforcing rod (42) is connected to the lifting plate (41) and the other end is slidably connected to the gantry (1); the limiting assembly (43) comprises a limiting frame (431), a first wheel (432), a second wheel (433), a third wheel (434) and a fourth wheel (435); The first wheel (432), the second wheel (433), the third wheel (434) and the fourth wheel (435) are all rotatably connected to the limiting frame (431); a lifting rope (232) passes between the first wheel (432) and the second wheel (433); and another lifting rope (232) passes between the third wheel (434) and the fourth wheel (435).

5. A lifting device for road and bridge construction according to claim 4, characterized in that: The limiting device (4) also includes a rotating column (44), the first end of which passes through the through hole (411) and is rotatably connected to the lifting plate (41), and a plurality of hooks (24) are provided, and the plurality of hooks (24) are all connected to the rotating column (44).

6. A lifting device for road and bridge construction according to claim 4, characterized in that: The gantry (1) comprises a first support frame (11), a second support frame (12) and a top frame (13); the first end of the top frame (13) is fixedly connected to the top of the first support frame (11), and the second end of the top frame (13) is fixedly connected to the top of the second support frame (12); the reinforcement rod (42) is slidably connected to the first support frame (11); one end of the auxiliary device (5) is connected to the first support frame (11), and the other end is connected to the reinforcement rod (42).

7. A lifting device for road and bridge construction according to claim 6, characterized in that: The auxiliary device (5) comprises a winch (51) and a rotating wheel (52); the winch (51) is fixedly connected to the bottom of the first support frame (11); the rotating wheel (52) is sleeved on the rotating shaft (22) and fixedly connected to the rotating shaft (22); a rope of the winch (51) passes through the rotating wheel (52) and is fixedly connected to the reinforcement rod (42).

8. A lifting device for road and bridge construction according to claim 6, characterized in that: The reinforcing rods (42) are arranged on both sides of the lifting plate (41), a plurality of groups of the auxiliary devices (5) are arranged, and each of the reinforcing rods (42) is connected to the auxiliary device (5).

9. A lifting device for road and bridge construction according to claim 1, characterized in that: The driving assembly (21) comprises a motor (211), a gear (212) and a ring gear (213); the motor (211) is fixedly connected to the gantry (1); the gear (212) is connected to the motor (211); the ring gear (213) is sleeved on the rotating shaft (22); the ring gear (213) is meshed with the gear (212) to realize driving the rotating shaft (22) to rotate.

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