A variable amplitude bridge deck crane for steel box girder construction

Abstract

The present application relates to the technical field of variable-amplitude bridge crane, especially relates to a variable-amplitude bridge crane for steel box girder construction. Technical problem: in the process of using the variable-amplitude bridge crane, in the process of hanging the steel box girder, since the mechanism for adjusting and clamping and fixing on both sides and the top is not set, the steel box girder is prone to loosening and falling off during transportation, and if it is windy, the steel box girder will also tilt. Technical scheme: a variable-amplitude bridge crane for steel box girder construction, comprising a wheeled variable-amplitude crane base and a wind protection assembly. The present application prevents the steel box girder from falling off and stabilizes the hanging by setting the anti-falling clamp lifting assembly, so that the steel box girder will not loosen and fall off during the hanging process, and the wind protection assembly can prevent the steel box girder from tilting in windy environment, and the lifting suspension assembly can be adjusted stably according to different suspension heights.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of variable amplitude bridge crane, and particularly relates to a variable amplitude bridge crane for steel box girder construction. BACKGROUND

[0002] The variable amplitude bridge crane for steel box girder construction on the market has a simple structure, and in the process of hanging the steel box girder, the two sides and the top of the steel box girder are not fixed by adjusting and clamping, so that the steel box girder is prone to falling off during transportation, and the steel box girder is also prone to tilting in windy weather, which further reduces the stability of the hanging. Therefore, it is urgent to provide a variable amplitude bridge crane which can adjust and clamp the two sides and the top of the steel box girder during the hanging process, and can also prevent wind protection, so as to meet the needs of efficient and stable use of the variable amplitude bridge crane. SUMMARY

[0003] In order to overcome the problem that in the process of using the variable amplitude bridge crane, the two sides and the top of the steel box girder are not fixed by adjusting and clamping during the hanging process, so that the steel box girder is prone to falling off during transportation, and the steel box girder is also prone to tilting in windy weather.

[0004] The technical scheme of the present application is as follows: a variable amplitude bridge crane for steel box girder construction, comprising a wheeled variable amplitude crane base, a mounting groove, a lifting suspension assembly, a rotary adjusting assembly, a hanging cross beam, a hydraulic lifting device, an anti-falling clamping assembly, and a wind protection assembly; the wheeled variable amplitude crane base is internally provided with a mounting groove; the mounting groove is internally provided with a lifting suspension assembly for lifting adjustment according to different suspension heights; the lifting suspension assembly is internally provided with a rotary adjusting assembly for rotating adjustment of the suspension position; the rotary adjusting assembly is internally provided with a hanging cross beam; the hanging cross beam is internally provided with a hydraulic lifting device; the hydraulic lifting device is internally provided with an anti-falling clamping assembly for anti-falling stable hanging of the steel box girder; and the anti-falling clamping assembly is externally provided with a wind protection assembly for preventing the steel box girder from falling down in windy environment during the hanging process.

[0005] Preferably, the anti-falling clamping assembly is used to prevent the steel box girder from falling off during the hanging process, the wind protection assembly is used to prevent the steel box girder from falling down in windy environment during the hanging process, the lifting suspension assembly is used to adjust the lifting according to different suspension heights, and the rotary adjusting assembly is used to rotate and adjust the suspension position, thereby further improving the stability of the variable amplitude bridge crane.

[0006] As preferred, the lifting suspension assembly comprises a hydraulic cylinder, a first protective outer sleeve column, a multi-stage telescopic inner sleeve column and a limiting lifting plate; the hydraulic cylinder is installed inside the mounting groove; the first protective outer sleeve column is sleeved outside the hydraulic cylinder; the multi-stage telescopic inner sleeve column that slides inside the first protective outer sleeve column is installed at the movable end of the hydraulic cylinder; and the limiting lifting plate is fixedly connected to the upper end of the multi-stage telescopic inner sleeve column, so that when the lifting adjustment is needed according to the different suspension heights, the hydraulic cylinder is started, the multi-stage telescopic inner sleeve column can slide in the first protective outer sleeve column, and the stable lifting adjustment is achieved.

[0007] As preferred, the rotation adjustment assembly comprises a rotation motor, an adjustment rotating shaft rod, a limiter and a rotating connection disc; the rotation motor is installed at the upper end of the limiting lifting plate; the adjustment rotating shaft rod is arranged at the output end of the rotation motor; the limiter is installed outside the adjustment rotating shaft rod; and the rotating connection disc is fixedly connected to the top end of the adjustment rotating shaft rod, so that when the suspension position needs to be adjusted, the rotation motor is started to drive the adjustment rotating shaft rod to rotate, and the rotating connection disc can drive the whole hanging cross beam to rotate and adjust.

[0008] As preferred, the anti-falling clamp and hanging assembly comprises a suspension rope, a fixed sleeve ring, a suspension support rod, a pressure connection sleeve, a pressure distribution connection 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 placing bottom plate, a double reinforced support plate, a support block, a positioning protection side plate, a fixed side disc, a second hydraulic telescopic rod, a telescopic side clamp plate and a limiting clamp block; the suspension rope is arranged at the lower end of the hydraulic lifting device, and can stably suspend.

[0009] As preferred, the fixed sleeve ring is installed outside the suspension rope; the suspension support rod is fixedly connected to the lower end of the fixed sleeve ring; the pressure connection sleeve is fixedly connected to the lower end of the suspension support rod, and the suspension support rod can efficiently support.

[0010] As preferred, the pressure distribution connection support rope is fixedly connected to the outside of the pressure connection sleeve; the protective top plate is installed at the lower end of the pressure distribution connection support rope; the first mounting plate is fixedly connected to the two sides of the protective top plate; the first hydraulic telescopic rod is installed at the upper end of the first mounting plate; the limiting pressure ring is installed at the movable end of the first hydraulic telescopic rod; the movable pressure plate is fixedly connected to the lower end of the limiting pressure ring, and the first hydraulic telescopic rod is started to drive the limiting pressure ring to move the movable pressure plate up and down, so that the top of the steel box girder is stably pressed.

[0011] As preferred, the fixed side plate is fixedly connected to the lower end of the protective top plate; the placing bottom plate is fixedly connected to the lower end of the fixed side plate; and the double reinforced support plate is fixedly connected to the upper end of the placing bottom plate, so that the placing bottom plate and the double reinforced support plate can stably support and resist the pressure of the steel box girder.

[0012] As preferred, the double reinforced support plate lower end is provided with a support block; the placing bottom plate upper end two sides are fixedly connected with a positioning protection side plate; the placing bottom plate upper end two sides are fixedly connected with a limiting clamping block, the positioning protection side plate can play a certain protection effect on the steel box girder side end.

[0013] As preferred, the positioning protection side plate outer side is fixedly connected with a fixed side disc; the fixed side disc side end is provided with a second hydraulic telescopic rod; the second hydraulic telescopic rod movable end is provided with a telescopic side clamping plate, the second hydraulic telescopic rod is started to make the telescopic side clamping plate can move left and right, thereby playing a stable protection clamping fixed effect on the steel box girder side end.

[0014] As preferred, the wind protection assembly comprises a protection installation upper plate, a telescopic cylinder, a pressure bearing connecting inclined plate, a windproof outer frame cover and a limiting inner strip; the fixed sleeve ring lower end is fixedly connected with the protection installation upper plate; the protection installation upper plate upper end two sides are provided with the telescopic cylinder; the telescopic cylinder movable end is provided with the pressure bearing connecting inclined plate; the pressure bearing connecting inclined plate lower end is fixedly connected with the windproof outer frame cover; the windproof outer frame cover inner wall is fixedly connected with the limiting inner strip close to the bottom end, when strong wind weather is needed, the telescopic cylinder is started, the pressure bearing connecting inclined plate can drive the windproof outer frame cover to move up and down, thereby covering the steel box girder, preventing the phenomenon of falling due to strong wind.

[0015] The beneficial effects of the present application are:

[0016] 1. The anti-falling clamping and hoisting assembly is used for preventing the steel box girder from falling and being stably hung, so that the steel box girder will not fall off during hoisting, the wind protection assembly is used for preventing the steel box girder from falling during hoisting in strong wind environment, the lifting and suspension assembly can be adjusted in lifting according to different suspension heights, the rotating adjustment assembly can be started to rotate and adjust the suspension position, compared with the existing variable amplitude bridge crane, the structure is relatively simple, during the process of hoisting the steel box girder, the mechanism for adjusting and clamping the two sides and the top is not provided, so that the steel box girder is prone to falling off during transportation, if strong wind weather occurs, the steel box girder will also be inclined, and the variable amplitude bridge crane can play the effect of efficient and stable wind protection.

[0017] 2. When it is needed to adjust in lifting according to different suspension heights, the hydraulic cylinder is started, the multi-stage telescopic inner sleeve column can slide in the first protection outer sleeve column, and the effect of stable adjustment in lifting is played, when it is needed to adjust the suspension position, the rotating motor is started to drive the adjusting shaft rod to rotate, so that the rotating connecting disc can drive the whole hanging cross beam to rotate and adjust.

[0018] 3, start the first hydraulic telescopic rod, make the limit pressure ring can drive the movable pressing plate up and down, to the top of steel box girder plays a stable pressing effect, using the placement of the bottom plate and double reinforced support plate can play a stable anti-pressure support effect on the steel box girder, using the positioning protection side plate can play a certain protective effect on the side end of steel box girder, start the second hydraulic telescopic rod makes telescopic side clamping plate can move left and right, so as to the side end of steel box girder plays a stable protective clamping fixed effect, when need strong wind weather, start telescopic cylinder, make the pressure connection inclined plate can drive the windproof outer frame cover up and down, so as to cover the steel box girder, prevent its because of strong wind phenomenon of falling. BRIEF DESCRIPTION OF DRAWINGS

[0019] Fig. 1 The three-dimensional structure schematic diagram of the variable amplitude bridge crane is shown.

[0020] Fig. 2 The three-dimensional structure schematic diagram of the first protective outer sleeve column of the variable amplitude bridge crane is shown.

[0021] Fig. 3 The three-dimensional structure schematic diagram of the suspension support rod of the variable amplitude bridge crane is shown.

[0022] Fig. 4 The three-dimensional structure schematic diagram of the protective top plate of the variable amplitude bridge crane is shown.

[0023] Fig. 5 The three-dimensional structure schematic diagram of the placement bottom plate of the variable amplitude bridge crane is shown.

[0024] Fig. 6 The three-dimensional structure schematic diagram of the pressure connection inclined plate of the variable amplitude bridge crane is shown.

[0025] Fig. 7 The three-dimensional structure schematic diagram of the windproof outer frame cover of the variable amplitude bridge crane is shown.

[0026] Explanation of reference signs: 1, wheeled amplitude-changing crane base; 2, mounting groove; 3, lifting suspension assembly; 4, rotary adjusting assembly; 5, hanging cross beam; 6, hydraulic lifting device; 7, anti-falling clamp suspension assembly; 8, windproof protection assembly; 301, hydraulic cylinder; 302, first protective outer sleeve column; 303, multi-stage telescopic inner sleeve column; 304, limiting lifting plate; 401, rotary motor; 402, adjusting rotating shaft rod; 403, limiter; 404, rotating connecting disc; 701, suspension rope; 702, fixed sleeve ring; 703, suspension support rod; 704, pressure-bearing connecting sleeve; 705, pressure-dividing 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, placing bottom plate; 713, double-reinforced support plate; 714, support block; 715, positioning protective side plate; 716, fixed side disc; 717, second hydraulic telescopic rod; 718, telescopic side clamping plate; 719, limiting clamping 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 application will be further described below in conjunction with the drawings and examples.

[0028] Please refer to Figs. 1-2The application provides an embodiment: a variable-amplitude bridge crane for steel box girder construction, which comprises a wheeled variable-amplitude crane base 1, a mounting groove 2, a lifting suspension assembly 3, a rotary adjusting assembly 4, a hanging cross beam 5, a hydraulic lifting device 6, an anti-falling clamp suspension assembly 7 and a windproof protection assembly 8. The wheeled variable-amplitude crane base 1 is internally provided with the mounting groove 2. The mounting groove 2 is internally provided with the lifting suspension assembly 3 for lifting adjustment according to different suspension heights. The lifting suspension assembly 3 is internally provided with the rotary adjusting assembly 4 for rotary adjustment of the suspension position. The rotary adjusting assembly 4 is internally provided with the hanging cross beam 5. The hanging cross beam 5 is internally provided with the hydraulic lifting device 6. The hydraulic lifting device 6 is internally provided with the anti-falling clamp suspension assembly 7 for anti-falling stable suspension of the steel box girder. The anti-falling clamp suspension assembly 7 is externally provided with the windproof protection assembly 8 for preventing the steel box girder from falling down in a strong wind environment. The anti-falling clamp suspension assembly 7 is used for anti-falling stable suspension of the steel box girder, so that the steel box girder will not fall off during the suspension process. The windproof protection assembly 8 is used for preventing the steel box girder from falling down in the strong wind environment during the suspension process. The lifting suspension assembly 3 is used for lifting adjustment according to different suspension heights. The rotary adjusting assembly 4 is used for rotary adjustment of the suspension position. The stability of the variable-amplitude bridge crane is further improved. The lifting suspension assembly 3 comprises a hydraulic cylinder 301, a first protective sleeve column 302, a multi-stage telescopic inner sleeve column 303 and a limiting lifting plate 304. The mounting groove 2 is internally provided with the hydraulic cylinder 301. The hydraulic cylinder 301 is externally provided with the first protective sleeve column 302. The movable end of the hydraulic cylinder 301 is provided with the multi-stage telescopic inner sleeve column 303 which is used for sliding in the first protective sleeve column 302. The upper end of the multi-stage telescopic inner sleeve column 303 is fixedly connected with the limiting lifting plate 304. When lifting adjustment according to different suspension heights is needed, the hydraulic cylinder 301 is started, and the multi-stage telescopic inner sleeve column 303 can slide in the first protective sleeve column 302, thereby stably adjusting the lifting. The rotary adjusting assembly 4 comprises a rotary motor 401, an adjusting rotary shaft 402, a limiter 403 and a rotary connecting disc 404. The upper end of the limiting lifting plate 304 is provided with the rotary motor 401. The output end of the rotary motor 401 is provided with the adjusting rotary shaft 402. The adjusting rotary shaft 402 is externally provided with the limiter 403. The top end of the adjusting rotary shaft 402 is fixedly connected with the rotary connecting disc 404. When the suspension position needs to be adjusted, the rotary motor 401 is started to drive the adjusting rotary shaft 402 to rotate, so that the rotary connecting disc 404 can drive the hanging cross beam 5 to rotate and adjust.

[0029] Please refer to Figs. 3-5In the embodiment, the anti-falling clamp hanging assembly 7 comprises a suspension rope 701, a fixed sleeve ring 702, a suspension support rod 703, a pressure bearing connecting sleeve 704, a pressure distribution connecting 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 placing bottom plate 712, a double reinforced support plate 713, a support block 714, a positioning protection side plate 715, a fixed side disc 716, a second hydraulic telescopic rod 717, a telescopic side clamp plate 718 and a limiting clamping block 719; the lower end of the hydraulic lifting device 6 is provided with the suspension rope 701, which can play a role in stabilizing suspension; the outer side of the suspension rope 701 is provided with the fixed sleeve ring 702; the lower end of the fixed sleeve ring 702 is fixedly connected with the suspension support rod 703; the lower end of the suspension support rod 703 is fixedly connected with the pressure bearing connecting sleeve 704, which can play a role in efficient support; the outer side of the pressure bearing connecting sleeve 704 is fixedly connected with the pressure distribution connecting support rope 705; the lower end of the pressure distribution connecting support rope 705 is provided with the protective top plate 706; the two sides of the protective top plate 706 are fixedly connected with the first mounting plate 707; the upper end of the first mounting plate 707 is provided with the first hydraulic telescopic rod 708; the movable end of the first hydraulic telescopic rod 708 is provided with the limiting pressure ring 709; the lower end of the limiting pressure ring 709 is fixedly connected with the movable pressure plate 710; the first hydraulic telescopic rod 708 is started to drive the movable pressure plate 710 to move up and down, thereby stably pressing the top of the steel box girder; the lower end of the protective top plate 706 is fixedly connected with the fixed side plate 711 on both sides; the lower end of the fixed side plate 711 is fixedly connected with the placing bottom plate 712; the upper end of the placing bottom plate 712 is fixedly connected with the double reinforced support plate 713; the placing bottom plate 712 and the double reinforced support plate 713 can stably support the steel box girder; the lower end of the double reinforced support plate 713 is provided with the support block 714; the upper end of the placing bottom plate 712 is fixedly connected with the positioning protection side plate 715 on both sides; the upper end of the placing bottom plate 712 is fixedly connected with the limiting clamping block 719 on both sides; the positioning protection side plate 715 can protect the side end of the steel box girder; the outer side of the positioning protection side plate 715 is fixedly connected with the fixed side disc 716; the side end of the fixed side disc 716 is provided with the second hydraulic telescopic rod 717; the movable end of the second hydraulic telescopic rod 717 is provided with the telescopic side clamp plate 718; the second hydraulic telescopic rod 717 is started to drive the telescopic side clamp plate 718 to move left and right, thereby stably protecting and clamping the side end of the steel box girder.

[0030] Please refer to Figs. 6-7In this embodiment, the windproof protection component 8 includes a protective mounting 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 fixing collar 702 is fixedly connected to the protective mounting plate 801. Telescopic cylinders 802 are installed on both sides of the upper end of the protective mounting plate 801. The movable end of the telescopic cylinder 802 is installed with the 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. When strong winds are needed, the telescopic cylinder 802 is activated, 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 and preventing it from tilting due to strong winds.

[0031] When working, if it is necessary to adjust the height according to the different suspension heights, the hydraulic cylinder 301 is activated, and the multi-stage telescopic inner sleeve column 303 can slide in the first protective outer sleeve column 302 to play a role in stabilizing and adjusting the height.

[0032] When it is necessary to adjust the suspension position, starting the rotary motor 401 can drive the adjusting shaft rod 402 to rotate, so that the rotating connecting plate 404 can drive the entire suspended crossbeam 5 to rotate and adjust.

[0033] Then, the suspension rope 701 can be used to stabilize the suspension, and the suspension support rod 703 can provide efficient support. Activating the first hydraulic telescopic rod 708 allows the limiting pressure ring 709 to drive the movable pressure plate 710 to move up and down, providing a stable pressing effect on the top of the steel box girder. The placement base plate 712 and the double-reinforced support plate 713 can provide a stable and compressive support effect for the steel box girder. The positioning protection side plate 715 can provide a certain protection effect on the side end of the steel box girder. Activating the second hydraulic telescopic rod 717 allows the telescopic side clamping plate 718 to move left and right, thereby providing a stable, protective, clamping, and fixing effect on the side end of the steel box girder.

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

[0035] Through the above steps, the anti-falling clamp hanging assembly 7 set up can prevent the steel box girder from falling off and stabilize the hanging, so that the steel box girder will not fall off during the hanging process. The wind protection assembly 8 can prevent the steel box girder from falling over during the hanging process in a strong wind environment. The lifting suspension assembly 3 can be adjusted in height. The rotation adjustment assembly 4 can be started to rotate and adjust the suspension position. In the process of using the variable-amplitude bridge crane, the steel box girder is prone to falling off during the hanging process because no mechanism is provided to adjust and clamp the two sides and the top of the steel box girder. In strong winds, the steel box girder may also tilt.

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

Claims

1. A variable amplitude bridge deck crane for steel box girder construction, comprising a wheeled variable amplitude crane base (1); characterized in that: It also includes installation groove (2), lifting suspension assembly (3), rotating adjustment assembly (4), hanging beam (5), hydraulic lifting device (6), anti-falling clamp hanging assembly (7), wind protection assembly (8); the inside of the wheel type amplitude changer base (1) is provided with an installation groove (2); the inside of the installation groove (2) is provided with a lifting suspension assembly (3) for lifting adjustment according to the different suspension heights; the upper end of the lifting suspension assembly (3) is provided with a rotating adjustment assembly (4) for rotating adjustment of the suspension position; the upper end of the rotating adjustment assembly (4) is provided with a hanging beam (5); the lower end of the hanging beam (5) is provided with a hydraulic lifting device (6); the lower end of the hydraulic lifting device (6) is provided with an anti-falling clamp hanging assembly (7) for preventing the steel box girder from falling and stably hanging; the outer side of the anti-falling clamp hanging assembly (7) is provided with a wind protection assembly (8) for preventing the steel box girder from falling in a strong wind environment when it is hung. 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 limiting lifting plate (304); the inside of the installation groove (2) is provided with a hydraulic cylinder (301); the outer side of the hydraulic cylinder (301) is provided with a first protective outer sleeve column (302); the movable end of the hydraulic cylinder (301) is provided with a multi-stage telescopic inner sleeve column (303) sliding in the first protective outer sleeve column (302); the upper end of the multi-stage telescopic inner sleeve column (303) is fixedly connected with a limiting lifting plate (304); The rotating adjustment assembly (4) comprises a rotating motor (401), an adjustment rotating shaft rod (402), a limiter (403) and a rotating connecting disc (404); the upper end of the limiting lifting plate (304) is provided with a rotating motor (401); the output end of the rotating motor (401) is provided with an adjustment rotating shaft rod (402); the outer side of the adjustment rotating shaft rod (402) is provided with a limiter (403); the top end of the adjustment rotating shaft rod (402) is fixedly connected with a rotating connecting disc (404); The anti-falling clamp hanging assembly (7) comprises a suspension rope (701), a fixed sleeve ring (702), a suspension support rod (703), a pressure connecting sleeve (704), a pressure distribution connecting 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 placing bottom plate (712), a double reinforced support plate (713), a support block (714), a positioning protection side plate (715), a fixed side disc (716), a second hydraulic telescopic rod (717), a telescopic side clamping plate (718) and a limiting clamping block (719); the lower end of the hydraulic lifting device (6) is provided with a suspension rope (701).

2. The variable amplitude bridge crane for steel box girder construction according to claim 1, characterized in that; The outer side of the suspension rope (701) is provided with a fixed sleeve ring (702); the lower end of the fixed sleeve ring (702) is fixedly connected with a suspension support rod (703); the lower end of the suspension support rod (703) is fixedly connected with a pressure connecting sleeve (704).

3. The variable amplitude bridge crane for steel box girder construction according to claim 2, characterized in that: The pressure bearing connecting sleeve (704) is fixedly connected with a pressure distribution connecting support rope (705) outside; the lower end of the pressure distribution connecting support rope (705) is provided with a protective top plate (706); the two sides of the protective top plate (706) are fixedly connected with a first mounting plate (707); the upper end of the first mounting plate (707) is provided with a first hydraulic telescopic rod (708); the movable end of the first hydraulic telescopic rod (708) is provided with a limiting pressure ring (709); the lower end of the limiting pressure ring (709) is fixedly connected with a movable pressure plate (710).

4. The variable amplitude bridge crane for steel box girder construction according to claim 3, characterized in that: The lower end of the protective top plate (706) is fixedly connected with a fixed side plate (711); the lower end of the fixed side plate (711) is fixedly connected with a placing bottom plate (712); the upper end of the placing bottom plate (712) is fixedly connected with a double reinforced support plate (713).

5. The variable-boom bridge crane for steel box girder construction according to claim 4, characterized in that: The lower end of the double reinforced support plate (713) is provided with a supporting block (714); the upper end of the placing bottom plate (712) is fixedly connected with a positioning protection side plate (715) on both sides; the upper end of the placing bottom plate (712) is fixedly connected with a limiting clamping block (719) on both sides.

6. The variable amplitude bridge crane for steel box girder construction according to claim 5, characterized in that: The outer side of the positioning protection side plate (715) is fixedly connected with a fixed side disc (716); the side end of the fixed side disc (716) is provided with a second hydraulic telescopic rod (717); the movable end of the second hydraulic telescopic rod (717) is provided with a telescopic side clamping plate (718).

7. The variable-boom bridge crane for steel box girder construction according to claim 2, characterized in that: The windproof protection assembly (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 sleeve ring (702) is fixedly connected with the protective mounting upper plate (801); the upper end of the protective mounting upper plate (801) is provided with the telescopic cylinder (802) on both sides; the movable end of the telescopic cylinder (802) is provided with the pressure bearing connecting inclined plate (803); the lower end of the pressure bearing connecting inclined plate (803) is fixedly connected with the windproof outer frame cover (804); the inner wall of the windproof outer frame cover (804) is fixedly connected with the limiting inner strip (805) near the bottom end.

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