A steel box girder hoisting device for bridge construction

Abstract

A steel box girder hoisting device for bridge construction comprises a trolley, a support platform is arranged above the trolley, a slewing mechanism is arranged between the support platform and the trolley, a telescopic arm is arranged above the support platform, a first oil cylinder is hinged between the telescopic arm and the support platform, a fixed pulley block is arranged at the top of the telescopic arm, a lifting mechanism is arranged on the left side of the top of the support platform, a sling is arranged below the fixed pulley block, the sling comprises a support frame, a movable pulley block is arranged at the top of the support frame, a clamping mechanism is arranged at the bottom of the support frame, the clamping mechanism comprises a support plate, a horizontally arranged lead screw is rotatably connected between two support plates, a power output shaft of a lead screw motor is transmission-connected with the lead screw, a guide rod is arranged between the two support plates, a support claw is threadedly connected to the lead screw, the internal threads of the two support claws are opposite, and the two support claws are both slidably connected to the guide rod. The utility model has a simple structure and is easy to use.

Description

Technical Field

[0001] The utility model belongs to the technical field of bridge construction, in particular to a steel box girder hoisting device for bridge construction. Background Art

[0002] Steel box girder, also known as steel plate box girder, is a commonly used structural form for large-span bridges. It is called a steel box girder because of its box-like appearance. The steel box girder is generally connected by a full welding method including a top plate, a bottom plate, a web plate, a transverse diaphragm, a longitudinal diaphragm and stiffening ribs. When installing the steel box girder, two hoisting machines are usually used to hoist the steel box girder. The hooks of the two cranes respectively lift the steel wire ropes tied to the two ends of the steel box girder, and the steel box girder is lifted by operating the lifting mechanisms of the two cranes. Since multiple people operate the cranes in coordination, the steel box girder may swing greatly due to asynchronous operation. Moreover, since the steel box girder is long, the steel box girder is lifted only by the lifting points at both ends. The center of gravity of the steel box girder is far away from the lifting points, resulting in deformation, which causes certain damage to the service life of the steel box girder. Therefore, in the prior art, the steel box girder is hoisted by multiple lifting equipment, which is not only inconvenient to operate and affect the construction efficiency, but also affects the service life of the steel box girder. Utility Model Content

[0003] In order to solve the technical problem of the inconvenience of existing steel box girder hoisting, the utility model provides a steel box girder hoisting device for bridge construction, comprising a movable trolley, the trolley comprising a trolley frame, the trolley frame plays a supporting role, a walking mechanism is arranged at the bottom end of the trolley frame, the walking mechanism comprises a walking wheel bracket fixed at the bottom end of the trolley frame, a walking wheel is rotatably mounted on the walking wheel bracket, a walking motor is fixed on the walking wheel bracket on one side of the walking wheel, a power output shaft of the walking motor is connected to the walking wheel by transmission, the walking motor is connected to the power supply and the control system by a cable, the walking motor is started, the walking motor can drive the walking wheel to rotate, so as to move the position of the trolley. A horizontally arranged support platform is arranged above the trolley, the support platform plays a supporting role, a slewing mechanism is arranged between the support platform and the trolley, the support platform can be rotatably assembled on the trolley through the slewing mechanism, the slewing mechanism comprises a slewing support, a transmission gear and a slewing motor assembled at the top end of the trolley frame, the slewing motor is connected to the outer gear ring of the slewing support by transmission gear, the slewing motor is started, and the slewing motor drives the support platform to rotate through the slewing support. Two symmetrically spaced and inclined telescopic arms are provided above the support platform, and the bottom end of the telescopic arm can be rotatably hinged on the top end of the support platform, and an inclined first oil cylinder is hinged between the telescopic arm and the support platform, and a fixed pulley group is provided on the top end of the telescopic arm. The telescopic arm includes a first support arm and a second support arm, and the bottom end of the first support arm is hinged on the support platform, and the second support arm can be slidably assembled on the upper end of the first support arm. A second oil cylinder is provided between the first support arm and the second support arm, and the lower end of the second oil cylinder is fixed on the first support arm, and the upper end of the second oil cylinder is fixed on the second support arm, and the second oil cylinder is arranged parallel to the first support arm. When the telescopic arm needs to be extended, the second oil cylinder is started, and the free end of the second oil cylinder is extended and pushes the second support arm to slide upward along the first support arm. Conversely, when the telescopic arm needs to be shortened, the second oil cylinder is started, and the free end of the second oil cylinder pulls the second support arm to slide into the first support arm. A lifting mechanism is provided on the left side of the top of the supporting platform, and a sling is provided under the fixed pulley block. The sling is connected to the lifting mechanism by a steel wire rope passing around the movable pulley block. The lifting mechanism includes a lifting drum rotatably mounted on the supporting platform, and also includes a lifting motor and a reducer fixed to the top of the supporting platform through a bracket. The power output shaft of the lifting motor is connected to the lifting drum through the reducer. When the lifting motor is started, the lifting motor drives the lifting drum to rotate, and the lifting drum is wound with a steel wire rope and the sling is pulled upward by the steel wire rope.The hoist includes a horizontally arranged support frame, which plays a supporting role. The top of the support frame is equipped with two movable pulley groups corresponding to the fixed pulley groups one by one. The bottom of the support frame is provided with several groups of clamping mechanisms for lifting the steel box girder. The clamping mechanisms are evenly spaced along the length direction of the support frame. The clamping mechanism includes two support plates fixed to the bottom end of the support frame, and a horizontally arranged lead screw is rotatably connected between the two support plates. A lead screw motor is fixed on one of the support plates, and a power output shaft of the lead screw motor is transmission connected to the lead screw. A guide rod for guiding is provided between the two support plates, and two symmetrically arranged L-shaped support claws are threadedly connected to the lead screw. The internal threads of the two support claws are opposite, and the two support claws are both slidably connected to the guide rod. The lead screw motor is connected to the power supply and the controller through a cable, and the lead screw motor is started. The lead screw motor drives the lead screw to rotate clockwise, and the lead screw pushes the two support claws to move toward each other. Conversely, the lead screw motor drives the lead screw to rotate counterclockwise, and the lead screw pushes the two support claws to move back to back.

[0004] Preferably, the upper end of the second supporting arm is equipped with a guide wheel group for guiding the steel wire rope.

[0005] Preferably, a counterweight is provided at the bottom end of the trolley frame.

[0006] The above solution has the following advantages:

[0007] The hoist is set up with multiple pairs of clamping mechanisms, and the screw is driven to rotate by the screw motor. The screw pushes the two supporting claws to clamp the steel box girder, which can make the steel box girder more evenly stressed when hoisted, reduce the deformation of the steel box girder, and reduce damage to the steel box girder; the trolley is set up to drive the running wheels to rotate through the running mechanism, so as to facilitate the movement of the trolley and the position of the steel box girder hoisted on the hoist; the slewing mechanism is set up to facilitate the adjustment of the placement angle of the steel box girder; the telescopic arm is set up to facilitate the adjustment of the lifting range. BRIEF DESCRIPTION OF THE DRAWINGS

[0008] Figure 1 It is a schematic diagram of the structure of the utility model;

[0009] Figure 2 The structure of the sling is shown in Figure 1. Figure 1 ;

[0010] Figure 3 The structure of the sling is shown in Figure 1. Figure 2 .

[0011] Figure numerals: 1. trolley; 2. supporting platform; 3. slewing mechanism; 4. telescopic arm; 5. lifting device; 6. clamping mechanism; 7. steel box girder; 11. trolley frame; 12. walking mechanism; 13. walking wheel bracket; 14. walking wheel; 15. walking motor; 16. counterweight; 21. lifting mechanism; 31. slewing support; 32. slewing motor; 33. transmission gear; 41. first supporting arm; 42. second supporting arm; 43. first oil cylinder; 44. second oil cylinder; 45. fixed pulley block; 46. guide wheel block; 47. wire rope; 51. supporting frame; 52. movable pulley block; 61. supporting plate; 62. lead screw; 63. guide rod; 64. lead screw motor; 65. supporting claw. DETAILED DESCRIPTION

[0012] like Figure 1-3As shown, a steel box girder lifting device for bridge construction includes a movable trolley 1, and the trolley 1 includes a trolley frame 11. The trolley frame 11 plays a supporting role. A walking mechanism 12 is provided at the bottom of the trolley frame 11. The walking mechanism 12 includes a walking wheel bracket 13 fixed to the bottom of the trolley frame 11, and a walking wheel 14 is rotatably mounted on the walking wheel bracket 13. A walking motor 15 is fixed to the walking wheel bracket 13 on one side of the walking wheel 14. The power output shaft of the walking motor 15 is transmission-connected to the walking wheel 14. The walking motor 15 is connected to a power supply and a control system through a cable. When the walking motor 15 is started, the walking motor 15 can drive the walking wheel 14 to rotate, thereby moving the position of the trolley 1. A horizontally arranged support platform 2 is provided above the trolley 1, and the support platform 2 plays a supporting role. A slewing mechanism 3 is provided between the support platform 2 and the trolley 1, and the support platform 2 can be rotatably assembled on the trolley 1 through the slewing mechanism 3. The slewing mechanism 3 includes a slewing support 31, a transmission gear 33 and a slewing motor 32 assembled on the top of the trolley frame 11. The slewing motor 32 is connected to the outer gear ring of the slewing support 31 through the transmission gear 33. When the slewing motor 32 is started, the slewing motor 32 drives the support platform 2 to rotate through the slewing support 31. Two symmetrically spaced and tilted telescopic arms 4 are provided above the support platform 2. The bottom ends of the telescopic arms 4 can be rotatably hinged to the top end of the support platform 2. A tilted first oil cylinder 43 is hinged between the telescopic arms 4 and the support platform 2. A fixed pulley group 45 is provided at the top of the telescopic arms 4. The telescopic arms 4 include a first support arm 41 and a second support arm 42. The bottom end of the first support arm 41 is hinged to the support platform 2. The second support arm 42 can be slidably assembled at the upper end of the first support arm 41. A first support arm 41 and a second support arm 42 are provided between the first support arm 41 and the second support arm 42. Second oil cylinder 44, the lower end of the second oil cylinder 44 is fixed on the first support arm 41, the upper end of the second oil cylinder 44 is fixed on the second support arm 42, and the second oil cylinder 44 is arranged parallel to the first support arm 41. When the telescopic arm 4 needs to be extended, the second oil cylinder 44 is started, and the free end of the second oil cylinder 44 is extended and pushes the second support arm 42 to slide upward along the first support arm 41. Conversely, when the telescopic arm 4 needs to be shortened, the second oil cylinder 44 is started, and the free end of the second oil cylinder 44 pulls the second support arm 42 to slide into the first support arm 41. A lifting mechanism 21 is provided on the left side of the top of the support platform 2, and a sling 5 is provided under the fixed pulley group 45. The sling 5 is connected to the lifting mechanism 21 by passing a steel wire rope 47 around a movable pulley group 52. The lifting mechanism 21 includes a lifting drum rotatably mounted on the support platform 2, and also includes a lifting motor and a reducer fixed to the top of the support platform through a bracket. The power output shaft of the lifting motor is connected to the lifting drum through the reducer. When the lifting motor is started, the lifting motor drives the lifting drum to rotate, and the lifting drum is wound around the steel wire rope 47 and pulls the sling 5 upward through the steel wire rope 47.The sling 5 includes a horizontally arranged support frame 51, which plays a supporting role. The top of the support frame 51 is equipped with two movable pulley groups 52 arranged one-to-one with the fixed pulley groups 45. The bottom end of the support frame 51 is provided with a plurality of clamping mechanisms 6 for lifting the steel box beam 7. The clamping mechanisms 6 are evenly spaced along the length direction of the support frame 51. The clamping mechanisms 6 include two support plates 61 fixed at the bottom end of the support frame 51. A horizontally arranged lead screw 62 is rotatably connected between the two support plates 61. A lead screw motor 64 is fixed on one of the support plates. The power output of the lead screw motor 64 The shaft is connected to the lead screw 62 in a transmission manner, and a guide rod 63 for guiding is provided between the two support plates 61. Two symmetrically arranged L-shaped support claws 65 are threadedly connected to the lead screw 62. The internal threads of the two support claws 65 are opposite, and the two support claws 65 are both slidingly connected to the guide rod 63. The lead screw motor 64 is connected to the power supply and the controller through a cable, and the lead screw motor 64 is started. The lead screw motor 64 drives the lead screw 62 to rotate clockwise, and the lead screw 62 pushes the two support claws 65 to move toward each other. Conversely, the lead screw motor 64 drives the lead screw 62 to rotate counterclockwise, and the lead screw 62 pushes the two support claws 65 to move back to back.

[0013] Preferably, the upper end of the second support arm 42 is equipped with a guide wheel set 46 for guiding the wire rope 47 .

[0014] Preferably, a counterweight 16 is provided at the bottom end of the trolley frame 11 .

[0015] Usage process:

[0016] When the utility model is in use, the travel motor 15 is started, and the travel motor 15 drives the travel wheel 14 to rotate, so that the position of the trolley 1 can be adjusted, and then the slewing motor 32 is started, and the slewing motor 32 drives the support platform 2 to rotate a certain angle through the slewing support 31, and the inclination of the telescopic arm 4 is adjusted by starting the first oil cylinder 43, and the length of the telescopic arm 4 is adjusted by the second oil cylinder 44, and then the lifting motor on the lifting mechanism 21 is started, and the lifting motor drives the lifting drum to rotate, and the lifting drum releases the wire rope 47, and the wire rope 47 pulls the sling 5 to fall above the steel box beam 7 until the lower end of the support claw 65 falls below the steel box beam 7, and then the screw motors 64 on each clamping mechanism 6 are started at the same time. The screw motor 64 drives the screw 62 to rotate clockwise, and the screw 62 pushes the two supporting claws 65 to move toward each other along the guide rod 63 until the two supporting claws 65 are respectively clamped on both sides of the steel box girder 7, and the lifting motor is started again. The wire rope 47 pulls the sling 5 to move vertically upward, and then the swivel angle of the sling 5 is adjusted by the swivel mechanism 3 respectively, and the height of the sling 5 is adjusted by the first cylinder 43 and the second cylinder 44 until the position of the steel box girder 7 on the sling 5 is adjusted. The lifting mechanism 21 is used to put the sling 5 in place, and the screw motor 64 is started again. The screw motor 64 drives the screw 62 to rotate counterclockwise, and the screw 62 pushes the two supporting claws 65 to move backwards until the supporting claws 65 move out of the steel box girder 7.

[0017] In the description of the present invention, it should be understood that the terms "up", "down", "left", "right", "top", "bottom", "horizontal", "vertical", etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0018] The above embodiments are intended to illustrate the present invention, not to limit the present invention. Any solution that is a simple transformation of the present invention falls within the protection scope of the present invention.

Claims

1. A steel box girder hoisting device for bridge construction, comprising a movable trolley, a horizontally arranged support platform is provided above the trolley, a slewing mechanism is provided between the support platform and the trolley, and the support platform can be rotatably assembled on the trolley through the slewing mechanism, characterized in that: Two symmetrically spaced and inclined telescopic arms are arranged above the support platform, the bottom end of the telescopic arms can be rotatably hinged on the top end of the support platform, a first oil cylinder arranged obliquely is hinged between the telescopic arms and the support platform, a fixed pulley block is arranged on the top end of the telescopic arms, a lifting mechanism is arranged on the left side of the top end of the support platform, a sling is arranged below the fixed pulley block, and the sling is connected to the lifting mechanism by passing a wire rope around the movable pulley block; the sling includes a horizontally arranged support frame, the top end of the support frame is equipped with two movable pulley blocks arranged one by one corresponding to the fixed pulley block, the bottom end of the support frame is provided with a plurality of clamping mechanisms for lifting the steel box girder, the clamping mechanisms are evenly spaced along the length direction of the support frame, the clamping mechanism includes two support plates fixed to the bottom end of the support frame, a horizontally arranged lead screw is rotatably connected between the two support plates, a lead screw motor is fixed on one of the support plates, a power output shaft of the lead screw motor is transmission-connected to the lead screw, a guide rod for guiding is arranged between the two support plates, two symmetrically arranged L-shaped support claws are threadedly connected to the lead screw, the internal threads of the two support claws are opposite, and the two support claws are both slidably connected to the guide rod.

2. The steel box girder hoisting device for bridge construction according to claim 1 is characterized in that: The lifting mechanism includes a lifting drum rotatably mounted on a support platform, and also includes a lifting motor and a reducer fixed to the top of the support platform through a bracket. The power output shaft of the lifting motor is connected to the lifting drum through the reducer.

3. The steel box girder hoisting device for bridge construction according to claim 1 is characterized in that: The telescopic arm includes a first support arm and a second support arm. The bottom end of the first support arm is hinged on the support platform. The second support arm can be slidably assembled on the upper end of the first support arm. A second oil cylinder is provided between the first support arm and the second support arm. The lower end of the second oil cylinder is fixed on the first support arm. The upper end of the second oil cylinder is fixed on the second support arm. The second oil cylinder is arranged parallel to the first support arm.

4. The steel box girder hoisting device for bridge construction according to claim 3 is characterized in that: The upper end of the second supporting arm is equipped with a guide wheel group for guiding the steel wire rope.

5. The steel box girder hoisting device for bridge construction according to claim 1, characterized in that: The trolley includes a trolley frame, a traveling mechanism is provided at the bottom end of the trolley frame, the traveling mechanism includes a traveling wheel bracket fixed at the bottom end of the trolley frame, a traveling wheel is rotatably mounted on the traveling wheel bracket, a traveling motor is fixed on the traveling wheel bracket on one side of the traveling wheel, and a power output shaft of the traveling motor is drivingly connected to the traveling wheel.

6. The steel box girder hoisting device for bridge construction according to claim 5, characterized in that: A counterweight is provided at the bottom end of the trolley frame.

7. The steel box girder hoisting device for bridge construction according to claim 6, characterized in that: The slewing mechanism comprises a slewing support, a transmission gear and a slewing motor which are assembled on the top of the trolley frame. The slewing motor is connected to the outer gear ring of the slewing support through the transmission gear.

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