Double-portal crane for hoisting prefabricated box girder

Abstract

The invention belongs to the field of prefabricated box girders, particularly relates to a double-portal crane for hoisting a prefabricated box girder, and provides the following scheme aiming at the problems that when an existing double-portal crane hoists, a device is easy to move, so that hoisting deviation occurs, meanwhile, a portal frame is heavy, and the position of the device is inconvenient to adjust. The device comprises two bottom rails and two gantries, the two bottom rails are arranged in parallel and fixed to the ground surface, the two gantries are arranged at the tops of the two bottom rails in a sliding mode and are perpendicular to the bottom rails, a servo motor drives a two-way lead screw and a sliding plate to move, the positions of the gantries are rapidly adjusted, and the working efficiency is improved. And the stability of the device in the hoisting process is ensured through the close contact between the friction plate and the bottom rail and the interaction between the trapezoidal block and the vertical rod after the position is adjusted through the flexible change of the hoisting position.

Description

Technical Field

[0001] The invention relates to the technical field of prefabricated box girders, and in particular to a double-gantry crane used for hoisting prefabricated box girders. Background Art

[0002] Prefabricated box beam is a type of beam in bridge engineering. It is hollow inside and has flanges on both sides of the upper part, similar to a box, hence the name. It is divided into single box and multiple boxes. The box beam of reinforced concrete structure is divided into prefabricated box beam and cast-in-place box beam. The box beam prefabricated in an independent site can be erected with a bridge erection machine after the lower project is completed, which can speed up the project progress and save construction time; cast-in-place box beams are mostly used for large continuous bridges.

[0003] When the existing prefabricated box girder is in use, it needs to be hoisted to a suitable position. However, the existing double-gantry crane is prone to movement of the device during hoisting, which in turn causes hoisting deviations. At the same time, the gantry is heavy and it is inconvenient to adjust the position of the device. Summary of the invention

[0004] The purpose of the present invention is to solve the problems existing in the prior art that the double-gantry crane is prone to movement of the device during hoisting, which leads to hoisting deviations, and at the same time, the gantry is heavy and it is inconvenient to adjust the position of the device. A double-gantry crane for hoisting prefabricated box girders is proposed to solve the problems.

[0005] In order to achieve the above object, the present invention adopts the following technical solutions:

[0006] A double-gantry crane for hoisting prefabricated box girders comprises two bottom rails and two door frames, wherein the two bottom rails are arranged in parallel and fixed on the ground surface, and the two door frames are slidably arranged on the top of the two bottom rails and arranged perpendicularly to the bottom rails;

[0007] The door frame includes an upper bracket, both sides of the bottom of the upper bracket are provided with a top support plate, the bottom of the top support plate is provided with a lower bracket, the bottom of the lower bracket is provided with a bottom support plate, the bottom of the bottom support plate is fixedly connected with two symmetrically arranged connecting seats, the bottom of the connecting seat is provided with two symmetrically arranged lower moving wheels, and the lower moving wheels are slidably connected to the top of the bottom track;

[0008] Top rails are provided on both sides of the top of the upper bracket, upper moving wheels are slidably connected to the tops of the two top rails, the tops of the two upper moving wheels are fixedly connected to the same top plate, a hoisting machine is provided at the bottom of the top plate, and an adjustment component for adjusting the position of the top plate is provided at the top of the upper bracket;

[0009] The inner walls on both sides of the upper bracket are provided with fixing components for fixing the top plate;

[0010] A same connecting block is fixedly connected between two connecting seats close to each other, and a same group of braking components for braking the bottom supporting plate are arranged on both sides of the connecting block.

[0011] In a possible design, the adjustment assembly includes two fixed plates respectively fixedly connected to the two ends of the upper bracket, the top of the fixed plate is fixedly connected to a side plate, the two side plates are rotatably connected to the same threaded rod, one side of one of the side plates is fixedly connected to a drive motor, the output shaft of the drive motor is fixedly connected to one end of the threaded rod, the top of the top plate is fixedly connected to a rectangular block, and the thread of the threaded rod passes through the rectangular block.

[0012] In a possible design, the fixing assembly includes two strip plates respectively slidably connected to the inner walls on both sides of the upper bracket, a plurality of second strip holes are opened inside the strip plates, and a plurality of insertion rods are fixedly connected to one side of the bottom of the upper movable wheel, and the insertion rods are clamped in the second strip holes.

[0013] In one possible design, the brake assembly includes two L-shaped blocks fixedly connected on both sides of the connecting block, the two L-shaped blocks are rotatably connected with the same bidirectional screw, one side of one of the L-shaped blocks is fixedly connected to a servo motor, the output shaft of the servo motor is fixedly connected to one end of the bidirectional screw, the top of the L-shaped block is slidably connected to a mounting plate, the top of the mounting plate is fixedly connected to a sliding plate, the bidirectional screw thread passes through the two sliding plates, the bottom sides of the mounting plate are fixedly connected to vertical plates, the bottom of one side of the vertical plate is fixedly connected to a friction plate, and the friction plate is in conflict with the bottom track.

[0014] In a possible design, a trapezoidal block is fixedly connected to one side of the sliding plate, and the two trapezoidal blocks are centrally symmetrically arranged.

[0015] In a possible design, two symmetrically arranged horizontal plates are fixedly connected between the two strip plates, and two symmetrically arranged vertical rods are fixedly connected to the bottom of the horizontal plates, and the vertical rods are used in conjunction with the trapezoidal blocks.

[0016] In a possible design, a reinforcing rod is provided inside the lower bracket, and two symmetrically arranged positioning holes are opened inside the bottom support plate. The positioning holes are used in conjunction with the vertical rod, and a first strip hole is opened inside the vertical rod, and the reinforcing rod passes through the first strip hole.

[0017] In the present application, when in use, the bottom track is installed at a suitable position according to the requirements. At this time, multiple lower moving wheels can be installed on the top of the bottom track first, and then the connecting seat and the lower bracket are installed in sequence. The same upper bracket is installed on the top of the two lower brackets, and the hoisting machine is installed on the top of the upper bracket. The prefabricated box beam is hoisted by using two portal frames to ensure stability;

[0018] At the same time, when the hoisting position needs to be adjusted or the mast position needs to be moved, the servo motor can be started, and the output shaft of the servo motor can drive the bidirectional screw to rotate, the bidirectional screw drives the two sliding plates to move away from each other, the two sliding plates drive the two mounting plates to move away from each other, the mounting plate drives the vertical plate to move horizontally, the vertical plate drives the friction plate to move horizontally, the friction plate no longer presses against the side of the bottom track, and the mast position can be moved;

[0019] And when the sliding plate moves, it can drive the trapezoidal block to move horizontally. The trapezoidal block is no longer located at the bottom of the vertical rod. The vertical rod moves downward under the action of gravity, and the vertical rod drives the horizontal plate to move downward. The horizontal plate drives the strip plate to move downward. At this time, the second strip hole is separated from the plug rod, and the braking state of the top plate can be released. At this time, the hoisting position can be adjusted;

[0020] Start the drive motor, and the output shaft of the drive motor drives the threaded rod to rotate, the threaded rod drives the rectangular block to move horizontally, the rectangular block drives the top plate to move horizontally, and the top plate drives the two upper moving wheels to move horizontally, so that the position of the hoisting machine can be quickly adjusted. When the adjustment is completed, start the servo motor again to make the friction plate press against the side of the bottom track. At the same time, the trapezoidal block lifts the vertical rod, so that the second strip hole and the plug rod are engaged again, ensuring the stability of the device during the hoisting process and easy use.

[0021] Beneficial effects:

[0022] 1. Enhanced flexibility and adjustability: The servo motor drives the movement of the bidirectional screw and the sliding plate to achieve rapid adjustment of the gantry position and flexible changes in the hoisting position. This design not only improves work efficiency, but also enables more accurate positioning of the hoisting point in complex construction environments, meeting diverse construction needs.

[0023] 2. Improved stability: After adjusting the position, the close contact between the friction plate and the bottom track and the interaction between the trapezoidal block and the vertical rod ensure the stability of the device during the hoisting process. This double locking mechanism effectively prevents shaking or displacement during the hoisting process and improves construction safety.

[0024] 3. Easy operation: By driving the motor to control the movement of the threaded rod and the rectangular block, the position of the hoist can be adjusted quickly and accurately. This electric and automated operation method greatly simplifies the operation process and reduces the complexity and labor intensity of manual operation.

[0025] 4. Compact structure and high integration: The whole device is compactly designed and the components are closely matched, which not only ensures the integrity of the function but also improves the space utilization. This highly integrated design makes the device more convenient in installation, transportation and maintenance.

[0026] 5. Strong adaptability: The device can flexibly adjust the hoisting position and height according to the needs of different construction scenarios. It is suitable for various types of prefabricated box girder hoisting operations, showing good versatility and adaptability. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 A three-dimensional structural schematic diagram of a double-gantry crane for hoisting prefabricated box girders proposed by the present invention;

[0028] Figure 2 This is a schematic diagram of the main structure of a double-gantry crane for hoisting prefabricated box girders proposed by the present invention;

[0029] Figure 3 This is a schematic diagram of the main structure of an upper bracket of a double-gantry crane for hoisting prefabricated box girders proposed by the present invention;

[0030] Figure 4 A schematic diagram of the three-dimensional structure of a limit plate in a double-gantry crane for hoisting prefabricated box girders proposed by the present invention;

[0031] Figure 5 A schematic diagram of the three-dimensional structure of a middle and lower bracket of a double-gantry crane for hoisting prefabricated box girders proposed by the present invention;

[0032] Figure 6 The present invention is a schematic diagram of the three-dimensional structure of a connecting block in a double-gantry crane for hoisting prefabricated box girders.

[0033] In the figure: 1. bottom track; 2. lower moving wheel; 3. connecting seat; 4. lower bracket; 5. upper bracket; 6. side plate; 7. threaded rod; 8. hoisting machine; 9. top plate; 10. upper moving wheel; 11. top track; 12. rectangular block; 13. driving motor; 14. L-shaped block; 15. fixing plate; 16. horizontal plate; 17. vertical rod; 18. first strip hole; 19. plug rod; 20. strip plate; 21. second strip hole; 22. top support plate; 23. bottom support plate; 24. connecting block; 25. trapezoidal block; 26. bidirectional screw rod; 27. sliding plate; 28. servo motor; 29. ​​mounting plate; 30. vertical plate; 31. friction plate; 32. positioning hole; 33. reinforcing rod. DETAILED DESCRIPTION

[0034] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments.

[0035] Example 1

[0036] Reference Figure 1-6 A double-gantry crane for hoisting prefabricated box girders, which is used in the field of prefabricated box girders, comprises: two bottom rails 1 and two door frames, the two bottom rails 1 are arranged in parallel and fixed on the ground, and the two door frames are slidably arranged on the top of the two bottom rails 1 and are arranged vertically on the bottom rails 1;

[0037] The portal frame includes an upper bracket 5, and top support plates 22 are arranged on both sides of the bottom of the upper bracket 5, a lower bracket 4 is arranged at the bottom of the top support plate 22, and a bottom support plate 23 is arranged at the bottom of the lower bracket 4. Two symmetrically arranged connecting seats 3 are fixedly connected to the bottom of the bottom support plate 23, and two symmetrically arranged lower moving wheels 2 are arranged at the bottom of the connecting seats 3. The lower moving wheels 2 are slidably connected to the top of the bottom rail 1. The bottom rail 1 is installed in a suitable position according to needs. At this time, multiple lower moving wheels 2 can be installed on the top of the bottom rail 1 first, and then the connecting seats 3 and the lower bracket 4 are installed in sequence. The same upper bracket 5 is installed on the top of the two lower brackets 4, and the hoisting machine 8 is installed on the top of the upper bracket 5. The prefabricated box girder is hoisted by using two portals to ensure stability.

[0038] Top rails 11 are provided on both sides of the top of the upper bracket 5, and upper moving wheels 10 are slidably connected to the tops of the two top rails 11. The tops of the two upper moving wheels 10 are fixedly connected to the same top plate 9, and a hoisting machine 8 is provided at the bottom of the top plate 9. An adjustment component for adjusting the position of the top plate 9 is provided on the top of the upper bracket 5. The adjustment component includes two fixed plates 15 respectively fixedly connected to the two ends of the upper bracket 5, and the top of the fixed plate 15 is fixedly connected to the side plate 6. The same threaded rod 7 is rotatably connected between the two side plates 6, and a driving motor 13 is fixedly connected to one side of one of the side plates 6, and the output shaft of the driving motor 13 is fixedly connected to one end of the threaded rod 7. A rectangular block 12 is fixedly connected to the top of the top plate 9, and the threaded rod 7 threads through the rectangular block 12. The driving motor 13 is started, and the output shaft of the driving motor 13 drives the threaded rod 7 to rotate, and the threaded rod 7 drives the rectangular block 12 to move horizontally, and the rectangular block 12 drives the top plate 9 to move horizontally, and the top plate 9 drives the two upper moving wheels 10 to move horizontally, so that the position of the hoisting machine 8 can be quickly adjusted. When the adjustment is completed, the servo motor 28 is started again, so that the friction plate 31 is pressed against the side of the bottom track 1, and at the same time, the trapezoidal block 25 lifts the vertical rod 17, so that the second strip hole 21 is engaged with the plug rod 19 again, ensuring the stability of the device during the hoisting process and convenient use;

[0039] The inner walls on both sides of the upper bracket 5 are provided with fixing components for fixing the top plate 9, and the fixing components include two strip plates 20 slidably connected to the inner walls on both sides of the upper bracket 5, and a plurality of second strip holes 21 are opened inside the strip plates 20. A plurality of plug rods 19 are fixedly connected to one side of the bottom of the upper moving wheel 10, and the plug rods 19 are snapped into the second strip holes 21. Two symmetrically arranged cross plates 16 are fixedly connected between the two strip plates 20, and two symmetrically arranged vertical rods 17 are fixedly connected to the bottom of the cross plate 16. The vertical rods 17 are used in conjunction with the trapezoidal blocks 25, and when the sliding plates 27 move, the trapezoidal blocks 25 can be driven to move horizontally, and the trapezoidal blocks 25 are no longer located at the bottom of the vertical rods 17. The vertical rods 17 move downward under the action of gravity, and the vertical rods 17 drive the cross plates 16 to move downward, and the cross plates 16 drive the strip plates 20 to move downward. At this time, the second strip holes 21 are disengaged from the plug rods 19, and the braking state of the top plate 9 can be released. At this time, the hoisting position can be adjusted;

[0040] A same connecting block 24 is fixedly connected between two connecting seats 3 close to each other, and a same group of brake components for braking the bottom support plate 23 are arranged on both sides of the connecting block 24, and the brake component includes two L-shaped blocks 14 respectively fixedly connected on both sides of the connecting block 24, and a same bidirectional screw rod 26 is rotatably connected between the two L-shaped blocks 14, and a servo motor 28 is fixedly connected to one side of one L-shaped block 14, and the output shaft of the servo motor 28 is fixedly connected to one end of the bidirectional screw rod 26, and a mounting plate 29 is slidably connected to the top of the L-shaped block 14, and a sliding plate 27 is fixedly connected to the top of the mounting plate 29, and the bidirectional screw rod 26 threads penetrate the two sliding plates 27, and the bottom of the mounting plate 29 is fixedly connected on both sides There is a vertical plate 30, and a friction plate 31 is fixedly connected to the bottom of one side of the vertical plate 30, and the friction plate 31 conflicts with the bottom track 1. A trapezoidal block 25 is fixedly connected to one side of the sliding plate 27, and the two trapezoidal blocks 25 are arranged symmetrically with the center. At the same time, when it is necessary to adjust the lifting position or move the door frame position, the servo motor 28 can be started, and the output shaft of the servo motor 28 can drive the bidirectional screw rod 26 to rotate, and the bidirectional screw rod 26 drives the two sliding plates 27 away from each other, and the two sliding plates 27 drive the two mounting plates 29 away from each other, and the mounting plate 29 drives the vertical plate 30 to move horizontally, and the vertical plate 30 drives the friction plate 31 to move horizontally, and the friction plate 31 no longer presses against the side of the bottom track 1, so that the door frame position can be moved.

[0041] Example 2

[0042] refer to Figure 1-6 , improved on the basis of Example 1: a reinforcing rod 33 is provided inside the lower bracket 4, two symmetrically arranged positioning holes 32 are opened inside the bottom support plate 23, the positioning holes 32 are used in conjunction with the vertical rod 17, a first strip hole 18 is opened inside the vertical rod 17, and the reinforcing rod 33 passes through the first strip hole 18.

[0043] However, as is well known to those skilled in the art, the working principles and wiring methods of the drive motor 13, servo motor 28 and hoisting machine 8 are commonplace, and are conventional means or common knowledge, and will not be elaborated here. Those skilled in the art can make any optional selections according to their needs or convenience.

[0044] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical scheme and inventive concept of the present invention within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A double-gantry crane for hoisting prefabricated box girders, characterized in that: include: Two bottom rails (1) and two door frames, the two bottom rails (1) are arranged in parallel and fixed on the ground, and the two door frames are slidably arranged on the top of the two bottom rails (1) and are arranged perpendicular to the bottom rails (1); The door frame comprises an upper bracket (5), both sides of the bottom of the upper bracket (5) are provided with top support plates (22), the bottom of the top support plate (22) is provided with a lower bracket (4), the bottom of the lower bracket (4) is provided with a bottom support plate (23), the bottom of the bottom support plate (23) is fixedly connected with two symmetrically arranged connecting seats (3), the bottom of the connecting seats (3) is provided with two symmetrically arranged lower moving wheels (2), and the lower moving wheels (2) are slidably connected to the top of the bottom track (1); Top rails (11) are provided on both sides of the top of the upper bracket (5); the tops of the two top rails (11) are slidably connected to upper moving wheels (10); the tops of the two upper moving wheels (10) are fixedly connected to the same top plate (9); a hoisting machine (8) is provided at the bottom of the top plate (9); and an adjustment component for adjusting the position of the top plate (9) is provided at the top of the upper bracket (5); The inner walls on both sides of the upper bracket (5) are provided with fixing components for fixing the top plate (9); A same connecting block (24) is fixedly connected between two connecting seats (3) adjacent to each other, and a same set of braking components for braking the bottom support plate (23) are arranged on both sides of the connecting block (24).

2. A double-gantry crane for hoisting prefabricated box beams according to claim 1, characterized in that: The adjustment assembly comprises two fixing plates (15) respectively fixedly connected to the two ends of the upper bracket (5); the top of the fixing plate (15) is fixedly connected to a side plate (6); the two side plates (6) are rotatably connected to a same threaded rod (7); one side of one of the side plates (6) is fixedly connected to a driving motor (13); the output shaft of the driving motor (13) is fixedly connected to one end of the threaded rod (7); the top of the top plate (9) is fixedly connected to a rectangular block (12); the threaded rod (7) is threadedly passed through the rectangular block (12).

3. A double-gantry crane for hoisting prefabricated box beams according to claim 1, characterized in that: The fixing assembly comprises two strip plates (20) respectively slidably connected to the inner walls on both sides of the upper bracket (5), a plurality of second strip holes (21) are opened inside the strip plates (20), and a plurality of insertion rods (19) are fixedly connected to one side of the bottom of the upper moving wheel (10), and the insertion rods (19) are snap-fitted with the second strip holes (21).

4. A double-gantry crane for hoisting prefabricated box beams according to claim 1, characterized in that: The brake assembly comprises two L-shaped blocks (14) respectively fixedly connected to both sides of a connecting block (24); a same bidirectional screw rod (26) is rotatably connected between the two L-shaped blocks (14); a servo motor (28) is fixedly connected to one side of one of the L-shaped blocks (14); an output shaft of the servo motor (28) is fixedly connected to one end of the bidirectional screw rod (26); a mounting plate (29) is slidably connected to the top of the L-shaped block (14); a sliding plate (27) is fixedly connected to the top of the mounting plate (29); the bidirectional screw rod (26) is threadedly passed through the two sliding plates (27); vertical plates (30) are fixedly connected to both sides of the bottom of the mounting plate (29); a friction plate (31) is fixedly connected to the bottom of one side of the vertical plate (30); and the friction plate (31) is in contact with the bottom track (1).

5. A double-gantry crane for hoisting prefabricated box beams according to claim 4, characterized in that: A trapezoidal block (25) is fixedly connected to one side of the sliding plate (27), and the two trapezoidal blocks (25) are centrally symmetrically arranged.

6. A double-gantry crane for hoisting prefabricated box beams according to claim 3, characterized in that: Two symmetrically arranged transverse plates (16) are fixedly connected between the two strip plates (20), and two symmetrically arranged vertical rods (17) are fixedly connected to the bottom of the transverse plates (16), and the vertical rods (17) are used in conjunction with the trapezoidal blocks (25).

7. A double-gantry crane for hoisting prefabricated box beams according to claim 1, characterized in that: A reinforcing rod (33) is arranged inside the lower bracket (4), two symmetrically arranged positioning holes (32) are opened inside the bottom support plate (23), the positioning holes (32) are used in conjunction with the vertical rod (17), a first strip hole (18) is opened inside the vertical rod (17), and the reinforcing rod (33) passes through the first strip hole (18).

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