Amplitude-variable bridge deck crane for steel box girder construction

Abstract

The invention relates to the technical field of variable-amplitude type deck cranes, in particular to a variable-amplitude type deck crane for steel box girder construction. The technical problems that in the using process of the variable-amplitude bridge deck crane, in the hanging process of a steel box girder, due to the fact that no mechanism for adjusting, clamping and fixing the two sides and the top of the steel box girder is arranged, the steel box girder is prone to loosening, falling and the like in the transportation process, and if it encounters strong wind, the steel box girder is prone to falling off. And the steel box girder is inclined and the like. According to the technical scheme, the variable-amplitude bridge deck crane for steel box girder construction comprises a wheel type variable-amplitude crane base and a windproof protection assembly. The anti-falling clamping and hanging assembly is arranged to conduct anti-falling stable hanging on the steel box girder, so that the steel box girder cannot be loosened or fall off in the hanging process, and the steel box girder can be prevented from toppling in a strong wind environment through the windproof protection assembly; the lifting suspension assembly can be stably adjusted according to different suspension heights.

Description

Technical Field

[0001] The invention relates to the technical field of variable-length bridge cranes, and in particular to a variable-length bridge crane used for steel box girder construction. Background Art

[0002] The structure of the variable-length bridge crane used for steel box girder construction on the market is relatively simple. In the process of hanging the steel box girder, there is no mechanism to adjust, clamp and fix the two sides and the top, which makes the steel box girder easy to loosen and fall during transportation. If there is strong wind, the steel box girder will also tilt, further reducing the stability of the hanging. Therefore, it is urgent to set up a variable-length bridge crane that can adjust, clamp and fix the two sides and the top of the steel box girder during the hanging process and can also provide wind protection, so as to meet the needs of efficient and stable use of the variable-length bridge crane. Summary of the invention

[0003] In order to overcome the problem that during the use of the variable-length bridge crane, when hanging the steel box girder, there is no mechanism to adjust, clamp and fix the two sides and the top, which leads to the steel box girder being easily loosened and falling during transportation. If there is strong wind, the steel box girder will also tilt.

[0004] The technical solution of the present invention is: a luffing type bridge crane for steel box girder construction, comprising a wheeled luffing crane base, an installation groove, a lifting and suspension component, a rotation adjustment component, a hanging crossbeam, a hydraulic lifting device, an anti-falling clamping and hanging component, and a windproof protection component; the wheeled luffing crane base is provided with an installation groove; the installation groove is provided with a lifting and suspension component for lifting and adjusting according to different suspension heights; the upper end of the lifting and suspension component is provided with a rotation adjustment component for rotating and adjusting the suspension position; the upper end of the rotation adjustment component is provided with a hanging crossbeam; the lower end of the hanging crossbeam is provided with a hydraulic lifting device; the lower end of the hydraulic lifting device is provided with an anti-falling clamping and hanging component for preventing the steel box girder from falling and stably hanging it; the outer side of the anti-falling clamping and hanging component is provided with a windproof protection component for preventing the steel box girder from tipping over in a windy environment when it is hung.

[0005] Preferably, an anti-fall clamp hanging assembly is used to prevent the steel box girder from falling and stably hang it, so that the steel box girder will not loosen and fall during the hanging process. The wind protection assembly can prevent the steel box girder from tipping over during the hanging process in a windy environment. At the same time, the lifting and lowering suspension assembly can be used to adjust the lifting and lowering according to different suspension heights. Starting the rotating adjustment assembly can rotate and adjust the suspension position, further improving the stability of the variable-length bridge deck crane.

[0006] Preferably, the lifting and suspension assembly includes a hydraulic cylinder, a first protective outer sleeve column, a multi-stage telescopic inner sleeve column and a limited lifting plate; the hydraulic cylinder is installed inside the mounting groove; the first protective outer sleeve column is sleeved on the outer side of the hydraulic cylinder; the movable end of the hydraulic cylinder is installed with a multi-stage telescopic inner sleeve column that slides inside the first protective outer sleeve column; the upper end of the multi-stage telescopic inner sleeve column is fixedly connected to the limited lifting plate, and when it is necessary to adjust the lifting and lowering according to different suspension heights, the hydraulic cylinder is started and the multi-stage telescopic inner sleeve column can slide in the first protective outer sleeve column, thereby playing a role in stabilizing the lifting and lowering adjustment.

[0007] Preferably, the rotation adjustment component includes a rotating motor, an adjusting shaft rod, a limiter and a rotating connecting plate; a rotating motor is installed on the upper end of the limit lifting plate; an adjusting shaft rod is provided at the output end of the rotating motor; a limiter is installed on the outer side of the adjusting shaft rod; a rotating connecting plate is fixedly connected to the top of the adjusting shaft rod, and when the suspension position needs to be adjusted, starting the rotating motor can drive the adjusting shaft rod to rotate, so that the rotating connecting plate can drive the hanging beam as a whole to rotate and adjust.

[0008] Preferably, the anti-fall clamping and lifting assembly includes a suspension rope, a fixed ring, a suspension support rod, a pressure-bearing connecting sleeve, a pressure-sharing connecting support rope, a protective top plate, a first mounting plate, a first hydraulic telescopic rod, a limiting pressure ring, a movable pressure plate, a fixed side plate, a placement bottom plate, a double reinforced support plate, a support block, a positioning protection side plate, a fixed side plate, a second hydraulic telescopic rod, a telescopic side clamp and a limiting block; a suspension rope is provided at the lower end of the hydraulic lifting device, which can play a role in stabilizing the suspension.

[0009] Preferably, a fixed ring is installed on the outside of the suspension rope; the lower end of the fixed ring is fixedly connected to the suspension support rod; the lower end of the suspension support rod is fixedly connected to the pressure-bearing connecting sleeve, so that the suspension support rod can achieve the effect of efficient support.

[0010] Preferably, a pressure-sharing connecting rope is fixedly connected to the outside of the pressure-bearing connecting sleeve; a protective top plate is installed at the lower end of the pressure-sharing connecting rope; a first mounting plate is fixedly connected to both sides of the protective top plate; a first hydraulic telescopic rod is installed at the upper end of the first mounting plate; a limiting pressure ring is installed at the movable end of the first hydraulic telescopic rod; a movable pressure plate is fixedly connected to the lower end of the limiting pressure ring, and when the first hydraulic telescopic rod is started, the limiting pressure ring can drive the movable pressure plate to move up and down, thereby exerting a stabilizing pressing effect on the top of the steel box girder.

[0011] Preferably, both sides of the lower end of the protective top plate are fixedly connected with fixed side plates; the lower end of the fixed side plate is fixedly connected with a placement base plate; the upper end of the placement base plate is fixedly connected with a double reinforcement support plate. The placement base plate and the double reinforcement support plate can provide a stable compressive support effect for the steel box girder.

[0012] Preferably, a support block is installed at the lower end of the double reinforced support plate; positioning protection side plates are fixedly connected to both sides of the upper end of the base plate; limiting blocks are fixedly connected to both sides of the upper end of the base plate, and the positioning protection side plates can provide a certain protective effect on the side ends of the steel box girder.

[0013] Preferably, a fixed side plate is fixedly connected to the outer side of the positioning protection side plate; a second hydraulic telescopic rod is installed on the side end of the fixed side plate; a telescopic side clamp is installed on the movable end of the second hydraulic telescopic rod, and the telescopic side clamp can be moved left and right by starting the second hydraulic telescopic rod, thereby stabilizing, protecting and clamping the side end of the steel box girder.

[0014] Preferably, the windproof protection component includes a protective mounting upper plate, a telescopic cylinder, a pressure-bearing connecting inclined plate, a windproof outer frame cover and a limiting inner strip; the lower end of the fixed ring is fixedly connected to the protective mounting upper plate; telescopic cylinders are installed on both sides of the upper end of the protective mounting upper plate; the movable end of the telescopic cylinder is installed with a pressure-bearing connecting inclined plate; the lower end of the pressure-bearing connecting inclined plate is fixedly connected to the windproof outer frame cover; the inner wall of the windproof outer frame cover is fixedly connected to the limiting inner strip near the bottom, and when strong winds are required, the telescopic cylinder is started so that the pressure-bearing connecting inclined plate can drive the windproof outer frame cover to move up and down, thereby covering the steel box girder to prevent it from tipping over due to strong winds.

[0015] Beneficial effects of the present invention:

[0016] 1. Use the anti-drop clamping assembly to prevent the steel box girder from falling and stably hang it, so that the steel box girder will not loosen and fall during the hanging process. The wind protection assembly can prevent the steel box girder from tipping over during the hanging process in a windy environment. At the same time, the lifting and lowering suspension assembly can be used to adjust the lifting and lowering according to the different suspension heights. The rotation adjustment assembly can be started to rotate and adjust the suspension position. Compared with the existing variable-length bridge crane, the structure is relatively simple. In the process of hanging the steel box girder, there is no mechanism to adjust and clamp the two sides and the top, which makes the steel box girder easy to loosen and fall during transportation. If there is strong wind, the steel box girder will also tilt. In terms of wind, the variable-length bridge crane can achieve the effect of efficient and stable windproof use;

[0017] 2. When it is necessary to adjust the lifting and lowering according to the different suspension heights, start the hydraulic cylinder, and the multi-stage telescopic inner sleeve column can slide in the first protective outer sleeve column to stabilize the lifting and lowering. When it is necessary to adjust the suspension position, start the rotating motor to drive the adjusting shaft rod to rotate, so that the rotating connecting plate can drive the entire hanging beam to rotate and adjust;

[0018] 3. Start the first hydraulic telescopic rod so that the limit pressure ring can drive the movable pressure plate to move up and down, thereby exerting a stable pressing effect on the top of the steel box girder. The placement of the bottom plate and the double reinforcement support plate can provide a stable compressive support effect on the steel box girder. The positioning protection side plate can provide a certain protective effect on the side end of the steel box girder. Start the second hydraulic telescopic rod so that the telescopic side clamp can move left and right, thereby providing a stable protective clamping and fixing effect on the side end of the steel box girder. When strong winds are required, start the telescopic cylinder so that the pressure-bearing connecting inclined plate can drive the windproof outer frame cover to move up and down, thereby covering the steel box girder to prevent it from tipping over due to strong winds. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 What is shown is a three-dimensional structural schematic diagram of the variable-luff bridge crane of the present invention;

[0020] Figure 2 Shown is a schematic diagram of the internal three-dimensional structure of the first protective outer casing column of the luffing type bridge crane of the present invention;

[0021] Figure 3 Shown is a three-dimensional structural schematic diagram of a suspension support rod of a variable-luff bridge crane of the present invention;

[0022] Figure 4 Shown is a schematic diagram of the three-dimensional structure of the protective top plate of the variable-luff bridge crane of the present invention;

[0023] Figure 5 Shown is a three-dimensional structural schematic diagram of a placement base plate of a variable-length bridge crane of the present invention;

[0024] Figure 6 Shown is a three-dimensional structural schematic diagram of a pressure-bearing connecting inclined plate of a variable-length bridge crane of the present invention;

[0025] Figure 7 Shown is a schematic diagram of the three-dimensional structure of the windproof outer frame cover of the variable-length bridge crane of the present invention.

[0026] Description of the accompanying drawings: 1. wheeled variable-length crane base; 2. mounting groove; 3. lifting and suspension assembly; 4. rotation adjustment assembly; 5. suspension beam; 6. hydraulic lifting device; 7. anti-drop clamping and hanging assembly; 8. wind protection assembly; 301. hydraulic cylinder; 302. first protective outer sleeve column; 303. multi-stage telescopic inner sleeve column; 304. limit lifting plate; 401. rotating motor; 402. adjusting shaft rod; 403. stopper; 404. rotating connecting plate; 701. suspension rope; 702. fixing ring; 703. suspension support rod; 704. pressure-bearing connecting sleeve; 705. 05. Pressure-sharing connecting support rope; 706. Protective top plate; 707. First mounting plate; 708. First hydraulic telescopic rod; 709. Limiting pressure ring; 710. Movable pressure plate; 711. Fixed side plate; 712. Placement bottom plate; 713. Double reinforcement support plate; 714. Support block; 715. Positioning protection side plate; 716. Fixed side plate; 717. Second hydraulic telescopic rod; 718. Telescopic side clamp; 719. Limiting block; 801. Protective mounting upper plate; 802. Telescopic cylinder; 803. Pressure-bearing connecting inclined plate; 804. Windproof outer frame cover; 805. Limiting inner strip. DETAILED DESCRIPTION

[0027] The present invention will be further described below in conjunction with the accompanying drawings and embodiments.

[0028] See also Figure 1-2The present invention provides an embodiment: a luffing type bridge crane for steel box girder construction, comprising a wheeled luffing crane base 1, an installation groove 2, a lifting suspension component 3, a rotation adjustment component 4, a hanging cross beam 5, a hydraulic lifting device 6, an anti-drop clamping suspension component 7, and a wind protection component 8; the wheeled luffing crane base 1 is provided with an installation groove 2; the installation groove 2 is provided with a lifting suspension component 3 for lifting and lowering according to different suspension heights; the upper end of the lifting suspension component 3 is provided with a rotation adjustment component 4 for rotating and adjusting the suspension position; the upper end of the rotation adjustment component 4 is provided with a hanging cross beam 5; the lower end of the hanging cross beam 5 is provided with a hydraulic lifting device Device 6; the lower end of the hydraulic lifting device 6 is equipped with an anti-falling clamping and hanging assembly 7 for preventing the steel box girder from falling and stably hanging; the outer side of the anti-falling clamping and hanging assembly 7 is equipped with a windproof protection assembly 8 for preventing the steel box girder from tipping over in a strong wind environment when it is hung. The anti-falling clamping and hanging assembly 7 is used to prevent the steel box girder from falling and stably hanging, so that the steel box girder will not loosen and fall during the hanging process, and the windproof protection assembly 8 can prevent the steel box girder from tipping over during the hanging process in a strong wind environment. At the same time, the lifting and hanging assembly 3 can be used to adjust the lifting and lowering according to the different suspension heights, and the rotation adjustment assembly 4 can be started to rotate and adjust the suspension position, and further The stability of the variable-length bridge crane is improved. The lifting suspension assembly 3 includes a hydraulic cylinder 301, a first protective outer sleeve column 302, a multi-stage telescopic inner sleeve column 303 and a limit lifting plate 304; the hydraulic cylinder 301 is installed inside the installation groove 2; the first protective outer sleeve column 302 is sleeved on the outer side of the hydraulic cylinder 301; the movable end of the hydraulic cylinder 301 is installed with a multi-stage telescopic inner sleeve column 303 that slides inside the first protective outer sleeve column 302; the upper end of the multi-stage telescopic inner sleeve column 303 is fixedly connected to the limit lifting plate 304, and when it is necessary to lift and adjust according to different suspension heights, the hydraulic cylinder 301 is started, and the multi-stage telescopic inner sleeve column 303 can be in the first The protective outer sleeve column 302 slides to stabilize the adjustment of lifting and lowering. The rotation adjustment component 4 includes a rotation motor 401, an adjustment shaft rod 402, a limiter 403 and a rotation connection disk 404; the upper end of the limit lifting plate 304 is equipped with a rotation motor 401; the output end of the rotation motor 401 is provided with an adjustment shaft rod 402; the outer side of the adjustment shaft rod 402 is installed with a limiter 403; the top of the adjustment shaft rod 402 is fixedly connected with a rotation connection disk 404. When the suspension position needs to be adjusted, starting the rotation motor 401 can drive the adjustment shaft rod 402 to rotate, so that the rotation connection disk 404 can drive the suspension beam 5 to rotate and adjust as a whole.

[0029] See also Figure 3-5In this embodiment, the anti-fall clamping and hanging assembly 7 includes a suspension rope 701, a fixed ring 702, a suspension support rod 703, a pressure-bearing connection sleeve 704, a pressure-sharing connection support rope 705, a protective top plate 706, a first mounting plate 707, a first hydraulic telescopic rod 708, a limiting pressure ring 709, a movable pressure plate 710, a fixed side plate 711, a placement bottom plate 712, a double reinforcement support plate 713, a support block 714, a positioning protection side plate 715, a fixed side plate 716, a second hydraulic telescopic rod 717, a telescopic side clamp 718 and a limiting block 719; the lower end of the hydraulic lifting device 6 is provided with a suspension rope 701, and the suspension rope 701 can In order to play a role in stable suspension, a fixed ring 702 is installed on the outside of the suspension rope 701; the lower end of the fixed ring 702 is fixedly connected to the suspension support rod 703; the lower end of the suspension support rod 703 is fixedly connected to the pressure-bearing connecting sleeve 704, and the suspension support rod 703 can play a role in efficient support, and the outer side of the pressure-bearing connecting sleeve 704 is fixedly connected to the pressure-sharing connecting support rope 705; the lower end of the pressure-sharing connecting support rope 705 is installed with a protective top plate 706; both sides of the protective top plate 706 are fixedly connected to the first mounting plate 707; the upper end of the first mounting plate 707 is installed with a first hydraulic telescopic rod 708; the movable end of the first hydraulic telescopic rod 708 is installed A limit pressure ring 709 is installed; the lower end of the limit pressure ring 709 is fixedly connected to a movable pressure plate 710, and the first hydraulic telescopic rod 708 is started so that the limit pressure ring 709 can drive the movable pressure plate 710 to move up and down, thereby playing a stable pressing role on the top of the steel box girder, and both sides of the lower end of the protective top plate 706 are fixedly connected to fixed side plates 711; the lower end of the fixed side plate 711 is fixedly connected to a placement bottom plate 712; the upper end of the placement bottom plate 712 is fixedly connected to a double reinforcement support plate 713, and the placement bottom plate 712 and the double reinforcement support plate 713 can play a stable compression support effect on the steel box girder, and the lower end of the double reinforcement support plate 713 is installed Support block 714; positioning protection side plates 715 are fixedly connected to both sides of the upper end of the placing base plate 712; limiting clamping blocks 719 are fixedly connected to both sides of the upper end of the placing base plate 712, and the positioning protection side plates 715 can provide a certain protection effect on the side ends of the steel box girder, and a fixed side plate 716 is fixedly connected to the outer side of the positioning protection side plates 715; a second hydraulic telescopic rod 717 is installed on the side end of the fixed side plate 716; a telescopic side clamping plate 718 is installed on the movable end of the second hydraulic telescopic rod 717, and the telescopic side clamping plate 718 can be moved left and right by starting the second hydraulic telescopic rod 717, thereby providing a stable protection and clamping effect on the side ends of the steel box girder.

[0030] See also Figure 6-7In this embodiment, the windproof protection component 8 includes a protective mounting upper plate 801, a telescopic cylinder 802, a pressure-bearing connecting inclined plate 803, a windproof outer frame cover 804 and a limiting inner strip 805; the lower end of the fixed ring 702 is fixedly connected to the protective mounting upper plate 801; telescopic cylinders 802 are installed on both sides of the upper end of the protective mounting upper plate 801; the movable end of the telescopic cylinder 802 is installed with a pressure-bearing connecting inclined plate 803; the lower end of the pressure-bearing connecting inclined plate 803 is fixedly connected to the windproof outer frame cover 804; the inner wall of the windproof outer frame cover 804 is fixedly connected to the limiting inner strip 805 near the bottom, and when strong winds are needed, the telescopic cylinder 802 is started so that the pressure-bearing connecting inclined plate 803 can drive the windproof outer frame cover 804 to move up and down, thereby covering the steel box girder to prevent it from tipping over due to strong winds.

[0031] When the lifting and lowering needs to be adjusted according to the different suspension heights during operation, the hydraulic cylinder 301 is started, and the multi-stage telescopic inner sleeve column 303 can slide in the first protective outer sleeve column 302 to stabilize the lifting and lowering.

[0032] When the suspension position needs to be adjusted, the rotating motor 401 is started to drive the adjusting shaft rod 402 to rotate, so that the rotating connecting plate 404 can drive the hanging beam 5 to rotate and adjust as a whole;

[0033] Then, the suspension rope 701 can be used to stabilize the suspension, the suspension support rod 703 can achieve the effect of efficient support, the first hydraulic telescopic rod 708 is started, so that the limit pressure ring 709 can drive the movable pressure plate 710 to move up and down, and the top of the steel box girder is pressed firmly, the bottom plate 712 and the double reinforcement support plate 713 are placed to provide a stable compression support effect for the steel box girder, the positioning protection side plate 715 can provide a certain protection effect for the side end of the steel box girder, and the second hydraulic telescopic rod 717 is started to allow the telescopic side clamping plate 718 to move left and right, so as to stabilize the side end of the steel box girder and clamp it firmly;

[0034] When strong winds are needed, the telescopic cylinder 802 is started, so that the pressure-bearing connecting inclined plate 803 can drive the windproof outer frame cover 804 to move up and down, thereby covering the steel box girder to prevent it from tipping over due to strong winds.

[0035] Through the above steps, the anti-fall clamping and hanging assembly 7 is set to prevent the steel box girder from falling and stably hang it, so that the steel box girder will not loosen and fall during the hanging process, and the wind protection assembly 8 can prevent the steel box girder from tipping over during the hanging process in a windy environment. At the same time, the lifting and lowering suspension assembly 3 can be used to adjust the lifting and lowering according to the different suspension heights, and the rotation adjustment assembly 4 can be started to rotate and adjust the suspension position to solve the problem that during the use of the variable-length bridge crane, when hanging the steel box girder, there is no mechanism to adjust and clamp the two sides and the top, which makes the steel box girder easy to loosen and fall during transportation. If there is strong wind, the steel box girder will also tilt.

[0036] The embodiments of the present invention are described in detail above with reference to the accompanying drawings, but the present invention is not limited to the above embodiments, and various changes can be made within the knowledge scope of those skilled in the art without departing from the spirit of the present invention.

Claims

1. A luffing type bridge crane for steel box girder construction, comprising a wheeled luffing crane base (1); characterized in that: The invention also comprises a mounting groove (2), a lifting suspension component (3), a rotation adjustment component (4), a hanging cross beam (5), a hydraulic lifting device (6), an anti-drop clamping component (7), and a wind protection component (8); the wheeled variable-length crane base (1) is provided with a mounting groove (2); the mounting groove (2) is provided with a lifting suspension component (3) for lifting and lowering according to different suspension heights; the upper end of the lifting suspension component (3) is provided with a rotation adjustment component (4) for rotating and adjusting the suspension position; the upper end of the rotation adjustment component (4) is provided with a hanging cross beam (5); the lower end of the hanging cross beam (5) is provided with a hydraulic lifting device (6); the lower end of the hydraulic lifting device (6) is provided with an anti-drop clamping component (7) for anti-dropping and stably hanging the steel box beam; the outer side of the anti-drop clamping component (7) is provided with a wind protection component (8) for preventing the steel box beam from tipping over in a windy environment when it is hung.

2. The variable-luff bridge crane for steel box girder construction according to claim 1, characterized in that: The lifting suspension assembly (3) comprises a hydraulic cylinder (301), a first protective outer sleeve column (302), a multi-stage telescopic inner sleeve column (303) and a limit lifting plate (304); the hydraulic cylinder (301) is installed inside the installation groove (2); the first protective outer sleeve column (302) is sleeved on the outer side of the hydraulic cylinder (301); the movable end of the hydraulic cylinder (301) is installed with a multi-stage telescopic inner sleeve column (303) that slides inside the first protective outer sleeve column (302); the upper end of the multi-stage telescopic inner sleeve column (303) is fixedly connected to the limit lifting plate (304).

3. The variable-luff bridge crane for steel box girder construction according to claim 2, characterized in that: The rotation adjustment component (4) comprises a rotation motor (401), an adjustment shaft rod (402), a stopper (403) and a rotation connection disk (404); the rotation motor (401) is installed at the upper end of the limit lifting plate (304); the output end of the rotation motor (401) is provided with an adjustment shaft rod (402); the stopper (403) is installed on the outer side of the adjustment shaft rod (402); and the rotation connection disk (404) is fixedly connected to the top end of the adjustment shaft rod (402).

4. The variable-luff bridge crane for steel box girder construction according to claim 1, characterized in that: The anti-fall clamping and hanging assembly (7) comprises a suspension rope (701), a fixed ring (702), a suspension support rod (703), a pressure-bearing connection sleeve (704), a pressure-sharing connection support rope (705), a protective top plate (706), a first mounting plate (707), a first hydraulic telescopic rod (708), a limiting pressure ring (709), a movable pressure plate (710), a fixed side plate (711), a placement bottom plate (712), a double reinforcement support plate (713), a support block (714), a positioning protection side plate (715), a fixed side plate (716), a second hydraulic telescopic rod (717), a telescopic side clamp plate (718) and a limiting block (719): a suspension rope (701) is provided at the lower end of the hydraulic lifting device (6).

5. The variable-luff bridge crane for steel box girder construction according to claim 1, characterized in that; A fixing ring (702) is installed on the outside of the suspension rope (701); the lower end of the fixing ring (702) is fixedly connected to a suspension support rod (703); and the lower end of the suspension support rod (703) is fixedly connected to a pressure-bearing connection sleeve (704).

6. The variable-luff bridge crane for steel box girder construction according to claim 5, characterized in that: A pressure-sharing connecting support rope (705) is fixedly connected to the outside of the pressure-bearing connecting sleeve (704); a protective top plate (706) is installed at the lower end of the pressure-sharing connecting support rope (705); first mounting plates (707) are fixedly connected to both sides of the protective top plate (706); a first hydraulic telescopic rod (708) is installed at the upper end of the first mounting plate (707); a limiting pressure ring (709) is installed at the movable end of the first hydraulic telescopic rod (708); and a movable pressure plate (710) is fixedly connected to the lower end of the limiting pressure ring (709).

7. The variable-luff bridge crane for steel box girder construction according to claim 6, characterized in that: Both sides of the lower end of the protective top plate (706) are fixedly connected to fixed side plates (711); the lower end of the fixed side plate (711) is fixedly connected to a placement bottom plate (712); and the upper end of the placement bottom plate (712) is fixedly connected to a double reinforcement support plate (713).

8. The variable-luff bridge crane for steel box girder construction according to claim 9, characterized in that: A support block (714) is installed at the lower end of the double reinforcement support plate (713); positioning protection side plates (715) are fixedly connected to both sides of the upper end of the placement base plate (712); and limiting clamping blocks (719) are fixedly connected to both sides of the upper end of the placement base plate (712).

9. The variable-luff bridge crane for steel box girder construction according to claim 8, characterized in that: A fixed side plate (716) is fixedly connected to the outer side of the positioning protection side plate (715); a second hydraulic telescopic rod (717) is installed at the side end of the fixed side plate (716); and a telescopic side clamping plate (718) is installed at the movable end of the second hydraulic telescopic rod (717).

10. The variable-luff bridge crane for steel box girder construction according to claim 5, characterized in that: The windproof protection component (8) comprises a protective mounting upper plate (801), a telescopic cylinder (802), a pressure-bearing connecting inclined plate (803), a windproof outer frame cover (804) and a limiting inner strip (805); the lower end of the fixed ring (702) is fixedly connected to the protective mounting upper plate (801); the telescopic cylinder (802) is installed on both sides of the upper end of the protective mounting upper plate (801); the movable end of the telescopic cylinder (802) is installed with a pressure-bearing connecting inclined plate (803); the lower end of the pressure-bearing connecting inclined plate (803) is fixedly connected to the windproof outer frame cover (804); the inner wall of the windproof outer frame cover (804) is fixedly connected near the bottom end with the limiting inner strip (805).

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