Bridge Erector Lifting Device

Abstract

The present invention discloses a lifting device for a bridge erecting machine, which includes a lifting trolley, and further includes: a lifting spreader, which is arranged above the lifting trolley, and the lifting spreader includes four load-bearing rods distributed in a "mouth" shape. A first lifting assembly is arranged horizontally on the first pair of relatively arranged load-bearing rods, and a pair of second lifting assemblies are arranged longitudinally on the second pair of relatively arranged load-bearing rods; a suspension spreader, whose top surface is a suspension surface and whose bottom surface is provided with a hook. The center of the suspension surface is connected to the first lifting assembly, and the two lateral sides of the center of the suspension surface are connected to a pair of second lifting assemblies. The present invention can achieve uniform stress on the suspension spreader, and each stress point lifts the suspension spreader at a uniform traction speed, preventing the hook from shaking and improving the safety of the lifting operation.

Description

Technical Field

[0001] The present invention relates to the technical field of bridge erection machines. More specifically, the present invention relates to a hoisting device for a bridge erection machine. Background Art

[0002] The hoisting trolley of a bridge erection machine is an important part of the bridge erection machine and is a mechanical device for hoisting heavy objects. The hoisting trolley travels on the girder of the bridge erection machine through four traveling wheels, can move horizontally along the girder, and can also move vertically up and down for hoisting operations. On the hoisting trolley, structures such as movable pulleys, fixed pulleys, and steel wire ropes are usually provided to realize the lifting of the hook. The problem is that due to factors such as different traction speeds of the platform where the hook is located or uneven forces, the platform shakes, thus reducing the safety of the hoisting operation. The problem that this application urgently needs to solve is exactly the above problem. Summary of the Invention

[0003] The present invention provides a hoisting device for a bridge erection machine, which can achieve uniform force on the suspended spreader, and each force point lifts the suspended spreader at a uniform traction speed, preventing the hook from shaking and improving the safety of the hoisting operation.

[0004] In order to achieve these and other advantages according to the present invention, a hoisting device for a bridge erection machine is provided, including a hoisting trolley, and further including:

[0005] A hoisting spreader, which is arranged above the hoisting trolley. The hoisting spreader includes four load-bearing rods distributed in a mouth shape. A first hoisting assembly is arranged horizontally on the first pair of opposite load-bearing rods, and a pair of second hoisting assemblies are arranged longitudinally on the second pair of opposite load-bearing rods;

[0006] A suspended spreader, whose top surface is a suspension surface and a hook is provided on the bottom surface. The center of the suspension surface is connected to the first hoisting assembly, and the two lateral sides of the center of the suspension surface are connected to a pair of second hoisting assemblies.

[0007] Preferably, the first hoisting assembly and the second hoisting assembly both include a pair of fixed rollers, a lifting roller, and a steel wire rope. The roller shafts of the pair of fixed rollers are coaxially fixed on the corresponding load-bearing rods. The roller shaft of a lifting roller is installed on the suspension surface through a bearing seat. The middle part of the steel wire rope is wound around the lifting roller, and the two ends are wound around the pair of fixed rollers. The pair of fixed rollers rotate at the same speed and in opposite directions.

[0008] Preferably, the first pair of load-bearing rods includes a second load-bearing rod and a fourth load-bearing rod, and each is provided with a fixed roller. The second pair of load-bearing rods includes a first load-bearing rod and a third load-bearing rod, and each is provided with two fixed rollers. The first load-bearing rod, the second load-bearing rod, the third load-bearing rod, and the fourth load-bearing rod rotate at the same speed. The rotation directions of the first load-bearing rod and the fourth load-bearing rod are the same, and the rotation directions of the second load-bearing rod and the third load-bearing rod are the same.

[0009] Preferably, the second pair of load-bearing rods and the first pair of load-bearing rods are arranged at different heights. One end of the rod bodies of the first load-bearing rod and the third load-bearing rod is provided with a worm part, and the other end is provided with a first bevel gear. One end of the rod bodies of the second load-bearing rod and the fourth load-bearing rod is provided with a worm gear part, and the other end is provided with a driving gear. One end of the first load-bearing rod rotates under the driving of a driving motor;

[0010] Power transmission is realized between the first load-bearing rod and the second load-bearing rod through the meshing of the worm and worm gear. Power transmission is realized between the second load-bearing rod and the third load-bearing rod through a first transmission rod. The first transmission rod is parallel to the second load-bearing rod and the first transmission rod and the second load-bearing rod are arranged at different heights. A second bevel gear and a driven gear are coaxially arranged on the first transmission rod. The driving gear of the second load-bearing rod meshes with the driven gear of the first transmission rod. The second bevel gear of the first transmission rod meshes with the first bevel gear of the third load-bearing rod. Power transmission is realized between the third load-bearing rod and the fourth load-bearing rod through the meshing of the worm and worm gear. Power transmission is realized between the fourth load-bearing rod and the first load-bearing rod through a second transmission rod. The second transmission rod is parallel to the fourth load-bearing rod and the second transmission rod and the fourth load-bearing rod are arranged at different heights. A second bevel gear and a driven gear are coaxially arranged on the second transmission rod. The driving gear of the fourth load-bearing rod meshes with the driven gear of the second transmission rod. The second bevel gear of the second transmission rod meshes with the first bevel gear of the first load-bearing rod.

[0011] Preferably, the hoisting trolley is further provided with a pair of suspensions. Guide grooves are provided on the opposite sides of the pair of suspensions. Guide wheels are respectively arranged on the two outer sides in the transverse direction of the suspension sling. The guide wheels are slidably arranged in the guide grooves.

[0012] Preferably, the axle of the guide wheel is an L-shaped axle. The horizontal rod body of the L-shaped axle is arranged longitudinally. The guide wheel is installed on the horizontal rod body of the L-shaped axle through a bearing. A tightening rotating shaft is arranged longitudinally on the vertical rod body of the L-shaped axle. The tightening rotating shaft rotates under the driving of a tightening motor.

[0013] The present invention has at least the following beneficial effects:

[0014] First, by arranging a hoisting sling on the hoisting trolley in the present invention, which is used to install the first hoisting component and the second hoisting component, so as to lift or lower the suspension sling, the uniform stress on the suspension sling can be realized, and each stress point lifts the suspension sling at a uniform traction speed, preventing the hook from shaking and improving the safety of the hoisting operation.

[0015] Second, the lifting tackle is arranged in the upper space of the hoisting trolley, and the hanging tackle is arranged in the lower space of the hoisting trolley for hoisting operations. The four load-bearing rods are symmetrically distributed. At the center of the first pair of load-bearing rods and the center of the hanging surface, a first lifting assembly is jointly arranged. At the center of the second pair of load-bearing rods on both sides in the transverse direction and the center of the hanging surface on both sides in the transverse direction, a second lifting assembly is jointly arranged, so that there are three force application points on the transverse center line of the hanging surface. The force application point at the center is tractioned by a wire rope distributed transversely, and the two force application points on both sides of the center are symmetrically tractioned by wire ropes distributed longitudinally. The first lifting assembly and the second lifting assembly can select implementation methods such as drums, pulleys, and sprockets, and there is no limitation here.

[0016] Third, both the first lifting assembly and the second lifting assembly wind wire ropes around the first fixed roller, the lifting roller, and the second fixed roller in sequence. The fixed rollers are all installed on the corresponding load-bearing rods, that is, by driving the rotation of the load-bearing rods to make the fixed rollers rotate, so as to realize the same-speed and reverse rotation of a pair of fixed rollers of the first lifting assembly, and the same-speed and reverse rotation of a pair of fixed rollers of the second lifting assembly. The four load-bearing rods are respectively the first load-bearing rod, the second load-bearing rod, the third load-bearing rod, and the fourth load-bearing rod. The first pair of load-bearing rods includes the second load-bearing rod and the fourth load-bearing rod. The second pair of load-bearing rods includes the first load-bearing rod and the third load-bearing rod. By driving the motor, the rotational speeds of the four load-bearing rods are the same. The rotation directions of the first load-bearing rod and the fourth load-bearing rod are the same, and the rotation directions of the second load-bearing rod and the third load-bearing rod are the same and different from the former, so as to lift the hanging tackle synchronously and at the same speed by the first lifting assembly and the second lifting assembly.

[0017] Fourth, the second pair of load-bearing rods is arranged higher than the first pair of load-bearing rods, so that the four load-bearing rods can realize power transmission. The shapes, specifications, and dimensions of the first load-bearing rod and the third load-bearing rod are the same and are arranged in reverse. The shapes, specifications, and dimensions of the second load-bearing rod and the fourth load-bearing rod are the same and are arranged in reverse. The first load-bearing rod and the second load-bearing rod realize power transmission through the meshing of a worm and a worm wheel. The second load-bearing rod and the third load-bearing rod realize power transmission through a first transmission rod, that is, the meshing of bevel gears to change the transmission direction, and then realize steering adjustment through gear meshing. The third load-bearing rod and the fourth load-bearing rod realize power transmission through the meshing of a worm and a worm wheel. The fourth load-bearing rod and the first load-bearing rod realize power transmission through a second transmission rod, that is, the meshing of bevel gears to change the transmission direction, and then realize steering adjustment through gear meshing, so as to realize that the first load-bearing rod rotates clockwise (counterclockwise), the second load-bearing rod rotates counterclockwise (clockwise), the third load-bearing rod rotates counterclockwise (clockwise), and the fourth load-bearing rod rotates clockwise (counterclockwise), so as to lift the hanging tackle synchronously and at the same speed by the first lifting assembly and the second lifting assembly.

[0018] Fifthly, a suspension is provided on the hoisting trolley to limit the lateral and longitudinal offsets of the suspended spreader. The guiding grooves are provided to guide the guiding wheels to move linearly up and down. The guiding wheels are non-powered wheels, and the guiding wheels slide in the guiding grooves during the lifting and lowering process of the suspended spreader. The L-shaped shaft includes a horizontal rod body and a vertical rod body. The vertical rod body is longitudinally provided with a tightening rotating shaft. By rotating the tightening rotating shaft through a tightening motor, the guiding wheels are deflected laterally, approaching or moving away from the guiding grooves to adjust the spacing, further improving the guiding accuracy. The horizontal rod body is longitudinally arranged and is connected to the guiding wheel bearings, enabling the guiding wheels to rotate relative to the L-shaped shaft during the lifting and lowering process of the suspended spreader.

[0019] Other advantages, objectives, and features of the present invention will be partially reflected by the following description and partially understood by those skilled in the art through the research and practice of the present invention. Brief Description of the Drawings

[0020] Figure 1 It is a schematic structural diagram of a technical solution of the present invention;

[0021] Figure 2 It is a schematic structural diagram of four load-bearing rods of a technical solution of the present invention;

[0022] Figure 3 It is a schematic structural diagram of the L-shaped shaft of a technical solution of the present invention. Detailed Embodiment

[0023] The following further describes the present invention in detail with reference to the drawings, so that those skilled in the art can implement it according to the description in the specification.

[0024] It should be understood that the terms such as "having", "comprising", and "including" used herein do not exclude the presence or addition of one or more other elements or their combinations.

[0025] It should be noted that, unless otherwise specified, the experimental methods described in the following implementation schemes are all conventional methods, and the reagents and materials, unless otherwise specified, can be obtained from commercial channels; in the description of the present invention, it should be noted that, unless otherwise clearly specified and defined, the terms "installation", "connection", and "setting" should be understood in a broad sense. For example, they can be fixedly connected and set, or detachably connected and set, or integrally connected and set. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific situations. The orientation or positional relationship indicated by the terms "lateral", "longitudinal", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present invention and simplifying the description, and does not indicate or imply 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 construed as a limitation to the present invention.

[0026] As Figures 1-2 shown, the present invention provides a bridge crane lifting device, which includes a lifting trolley 1. The lifting trolley 1 travels on the girder 3 of the bridge crane through four traveling wheels 2, and further includes:

[0027] A lifting spreader 4, which is arranged above the lifting trolley 1. The lifting spreader 4 includes four load-bearing rods distributed in a square shape. A first lifting assembly is arranged along the lateral direction on the first pair of relatively arranged load-bearing rods, and a pair of second lifting assemblies are arranged along the longitudinal direction on the second pair of relatively arranged load-bearing rods;

[0028] A suspension spreader 5, whose top surface is a suspension surface and whose bottom surface is provided with a hook. The center of the suspension surface is connected to the first lifting assembly, and the lateral two sides of the center of the suspension surface are connected to a pair of second lifting assemblies.

[0029] In the above technical solution, by arranging the lifting spreader 4 on the lifting trolley 1 for installing the first lifting assembly and the second lifting assembly, thereby lifting or lowering the suspension spreader 5, the uniform force on the suspension spreader 5 can be realized, and each force point can lift the suspension spreader 5 at a uniform traction speed, preventing the hook from shaking and improving the safety of the lifting operation.

[0030] The lifting tackle 4 is arranged in the upper space of the overhead trolley 1, and the suspension tackle 5 is arranged in the lower space of the overhead trolley 1 for hoisting operations. Four load-bearing rods are symmetrically distributed. At the center of the first pair of load-bearing rods and the center of the suspension surface, a first lifting assembly is jointly arranged. At the center of the second pair of load-bearing rods on the transverse two sides and the center of the suspension surface on the transverse two sides, a second lifting assembly is jointly arranged, so that there are three force application points on the transverse center line of the suspension surface. The force application point at the center is tractioned by the steel wire ropes 8 distributed transversely, and the two force application points on both sides of the center are symmetrically tractioned by the steel wire ropes 8 distributed longitudinally. The first lifting assembly and the second lifting assembly can select implementation methods such as drums, pulleys, sprockets, etc., which are not limited here.

[0031] In another technical solution, the first lifting assembly and the second lifting assembly both include a pair of fixed rollers 6, a lifting roller 7, and steel wire ropes 8. The roller shafts of the pair of fixed rollers 6 are coaxially fixed on the corresponding load-bearing rods. The roller shaft of a lifting roller 7 is installed on the suspension surface through a bearing seat. The middle part of the steel wire rope 8 is wound around the lifting roller 7, and both ends are wound around a pair of fixed rollers 6. The pair of fixed rollers 6 rotate at the same speed and in opposite directions. The first lifting assembly and the second lifting assembly are both wound around the first fixed roller 6, the lifting roller 7, and the second fixed roller 6 in sequence by the steel wire ropes 8. The fixed rollers 6 are all installed on the corresponding load-bearing rods, that is, by driving the load-bearing rods to rotate to make the fixed rollers 6 rotate, so as to realize the same-speed and reverse rotation of the pair of fixed rollers 6 of the first lifting assembly and the same-speed and reverse rotation of the pair of fixed rollers 6 of the second lifting assembly.

[0032] In another technical solution, the first pair of load-bearing rods includes the second load-bearing rod 10 and the fourth load-bearing rod 12, and each is provided with a fixed roller 6. The second pair of load-bearing rods includes the first load-bearing rod 9 and the third load-bearing rod 11, and each is provided with two fixed rollers 6. The first load-bearing rod 9, the second load-bearing rod 10, the third load-bearing rod 11, and the fourth load-bearing rod 12 have the same rotation speed. The rotation directions of the first load-bearing rod 9 and the fourth load-bearing rod 12 are the same, and the rotation directions of the second load-bearing rod 10 and the third load-bearing rod 11 are the same. The four load-bearing rods are respectively the first load-bearing rod 9, the second load-bearing rod 10, the third load-bearing rod 11, and the fourth load-bearing rod 12. The first pair of load-bearing rods includes the second load-bearing rod 10 and the fourth load-bearing rod 12, and the second pair of load-bearing rods includes the first load-bearing rod 9 and the third load-bearing rod 11. By driving the motor, the four load-bearing rods have the same rotation speed. The rotation directions of the first load-bearing rod 9 and the fourth load-bearing rod 12 are the same, and the rotation directions of the second load-bearing rod 10 and the third load-bearing rod 11 are the same and different from each other, so that the first lifting assembly and the second lifting assembly lift the suspension tackle 5 synchronously and at the same speed.

[0033] In another technical solution, the second pair of load-bearing rods and the first pair of load-bearing rods are arranged at different heights. One end of the rod body of the first load-bearing rod 9 is provided with a worm part 901, and the other end is provided with a first bevel gear 902. One end of the rod body of the third load-bearing rod 11 is provided with a worm part 111, and the other end is provided with a first bevel gear 112. One end of the rod bodies of the second load-bearing rod 10 and the fourth load-bearing rod 12 is provided with a worm gear part, and the other end is provided with a driving gear. One end of the first load-bearing rod 9 rotates under the driving of a driving motor 903;

[0034] Power transmission between the first load-bearing rod 9 and the second load-bearing rod 10 is achieved through worm and worm gear meshing. Power transmission between the second load-bearing rod 10 and the third load-bearing rod 11 is achieved through a first transmission rod 13. The first transmission rod 13 is parallel to the second load-bearing rod 10, and the first transmission rod 13 and the second load-bearing rod 10 are arranged at different heights. The first transmission rod 13 is coaxially provided with a second bevel gear 131 and a driven gear 132. The driving gear of the second load-bearing rod 10 (due to the overlap in the top view, the other end of the second load-bearing rod 10 is located below the first transmission rod 13 and is not shown in the figure) meshes with the driven gear 132 of the first transmission rod 13. The second bevel gear 131 of the first transmission rod 13 meshes with the first bevel gear 112 of the third load-bearing rod 11. Power transmission between the third load-bearing rod 11 and the fourth load-bearing rod 12 is achieved through worm and worm gear meshing. Power transmission between the fourth load-bearing rod 12 and the first load-bearing rod 9 is achieved through a second transmission rod 14. The second transmission rod 14 is parallel to the fourth load-bearing rod 12, and the second transmission rod 14 and the fourth load-bearing rod 12 are arranged at different heights. The second transmission rod 14 is coaxially provided with a second bevel gear 141 and a driven gear 142. The driving gear of the fourth load-bearing rod 12 (due to the overlap in the top view, the other end of the fourth load-bearing rod 12 is located below the second transmission rod 14 and is not shown in the figure) meshes with the driven gear 142 of the second transmission rod 14. The second bevel gear 141 of the second transmission rod 14 meshes with the first bevel gear 902 of the first load-bearing rod 9.

[0035] In the above technical solution, the second pair of load-bearing rods are arranged higher than the first pair of load-bearing rods, so that the four load-bearing rods can achieve power transmission. The first load-bearing rod 9 and the third load-bearing rod 11 are identical in shape, specification, and size and are arranged in opposite directions. The second load-bearing rod 10 and the fourth load-bearing rod 12 are identical in shape, specification, and size and are arranged in opposite directions. The first load-bearing rod 9 and the second load-bearing rod 10 achieve power transmission through the meshing of a worm and a worm wheel. The second load-bearing rod 10 and the third load-bearing rod 11 achieve power transmission through the first transmission rod 13, that is, the meshing of bevel gears to change the transmission direction, and then the steering adjustment is achieved through gear meshing. The third load-bearing rod 11 and the fourth load-bearing rod 12 achieve power transmission through the meshing of a worm and a worm wheel. The fourth load-bearing rod 12 and the first load-bearing rod 9 achieve power transmission through the second transmission rod 14, that is, the meshing of bevel gears to change the transmission direction, and then the steering adjustment is achieved through gear meshing. Thus, the first load-bearing rod 9 rotates clockwise (counterclockwise), the second load-bearing rod 10 rotates counterclockwise (clockwise), the third load-bearing rod 11 rotates counterclockwise (clockwise), and the fourth load-bearing rod 12 rotates clockwise (counterclockwise), so as to synchronously and at the same speed lift the suspension sling 5 of the first and second lifting components.

[0036] As Figure 3 shown, in another technical solution, the hoisting trolley 1 is further provided with a pair of suspensions 15. Guide grooves are provided on the opposite sides of the pair of suspensions 15. Guide wheels 16 are respectively provided on the two outer lateral sides of the suspension sling 5. The guide wheels 16 are slidably arranged in the guide grooves. The suspensions 15 are arranged on the hoisting trolley 1 to limit the lateral and longitudinal offsets of the suspension sling 5. The arrangement of the guide grooves guides the guide wheels 16 to perform linear lifting and lowering movements. The guide wheels 16 are non-powered wheels, and the guide wheels 16 slide in the guide grooves during the lifting and lowering process of the suspension sling 5.

[0037] In another technical solution, the axle of the guide wheel 16 is an L-shaped shaft 17. The horizontal rod body of the L-shaped shaft 17 is arranged longitudinally. The guide wheel 16 is installed on the horizontal rod body of the L-shaped shaft 17 through a bearing. A tightening rotating shaft 18 is arranged longitudinally on the vertical rod body of the L-shaped shaft 17. The tightening rotating shaft 18 rotates under the drive of a tightening motor 19. The L-shaped shaft 17 includes a horizontal rod body and a vertical rod body. The tightening rotating shaft 18 is arranged longitudinally on the vertical rod body. By rotating the tightening rotating shaft 18 through the tightening motor 19, the guide wheel 16 deflects laterally, approaching or departing from the guide groove, adjusting the distance, and further improving the guiding accuracy. The horizontal rod body is arranged longitudinally and is connected to the guide wheel 16 through a bearing, enabling the guide wheel 16 to rotate relative to the L-shaped shaft 17 during the lifting and lowering process of the suspension sling 5.

[0038] The number of devices and the processing scale described herein are used to simplify the description of the present invention. Applications, modifications, and variations of the present invention will be apparent to those skilled in the art. Although the embodiments of the present invention have been disclosed above, they are not limited to the applications listed in the specification and embodiments. It can be fully applied to various fields suitable for the present invention. For those familiar with the art, additional modifications can be easily achieved. Therefore, without departing from the general concept defined by the claims and the equivalent scope, the present invention is not limited to specific details and the illustrated examples described herein.

Claims

1. Bridge crane lifting device, including a lifting trolley, characterized in that, It further includes: A hoisting tackle, which is arranged above the hoisting trolley. The hoisting tackle includes four load-bearing rods distributed in a "mouth" shape. A first hoisting assembly is arranged transversely on the first pair of oppositely arranged load-bearing rods, and a pair of second hoisting assemblies are arranged longitudinally on the second pair of oppositely arranged load-bearing rods; A suspension tackle, whose top surface is a suspension surface and a hook is provided on the bottom surface. The center of the suspension surface is connected to the first hoisting assembly, and the two lateral sides of the center of the suspension surface are connected to a pair of second hoisting assemblies.

2. The bridge erection machine lifting device according to claim 1, characterized in that, The first hoisting assembly and the second hoisting assembly both include a pair of fixed rollers, a lifting roller, and steel wire ropes. The roller shafts of the pair of fixed rollers are coaxially fixed on the corresponding load-bearing rods. The roller shaft of a lifting roller is installed on the suspension surface through a bearing seat. The middle part of the steel wire rope is wound around the lifting roller, and the two ends are wound around a pair of fixed rollers. The pair of fixed rollers rotate at the same speed and in opposite directions.

3. The bridge crane lifting device according to claim 2, characterized in that, The first pair of load-bearing rods includes a second load-bearing rod and a fourth load-bearing rod, and each is provided with a fixed roller. The second pair of load-bearing rods includes a first load-bearing rod and a third load-bearing rod, and each is provided with two fixed rollers. The first load-bearing rod, the second load-bearing rod, the third load-bearing rod, and the fourth load-bearing rod rotate at the same speed. The first load-bearing rod and the fourth load-bearing rod rotate in the same direction, and the second load-bearing rod and the third load-bearing rod rotate in the same direction.

4. The bridge erection machine hoisting device according to claim 3, characterized in that The second pair of load-bearing rods and the first pair of load-bearing rods are arranged at different heights. One end of the rod bodies of the first load-bearing rod and the third load-bearing rod is provided with a worm part, and the other end is provided with a first bevel gear. One end of the rod bodies of the second load-bearing rod and the fourth load-bearing rod is provided with a worm gear part, and the other end is provided with a driving gear. One end of the first load-bearing rod rotates under the driving of a driving motor; Power transmission is realized between the first load-bearing rod and the second load-bearing rod through worm and worm gear meshing. Power transmission is realized between the second load-bearing rod and the third load-bearing rod through a first transmission rod. The first transmission rod is parallel to the second load-bearing rod and the first transmission rod and the second load-bearing rod are arranged at different heights. The first transmission rod is coaxially provided with a second bevel gear and a driven gear. The driving gear of the second load-bearing rod meshes with the driven gear of the first transmission rod. The second bevel gear of the first transmission rod meshes with the first bevel gear of the third load-bearing rod. Power transmission is realized between the third load-bearing rod and the fourth load-bearing rod through worm and worm gear meshing. Power transmission is realized between the fourth load-bearing rod and the first load-bearing rod through a second transmission rod. The second transmission rod is parallel to the fourth load-bearing rod and the second transmission rod and the fourth load-bearing rod are arranged at different heights. The second transmission rod is coaxially provided with a second bevel gear and a driven gear. The driving gear of the fourth load-bearing rod meshes with the driven gear of the second transmission rod. The second bevel gear of the second transmission rod meshes with the first bevel gear of the first load-bearing rod.

5. The bridge crane lifting device according to claim 1, characterized in that, The hoisting trolley is further provided with a pair of suspensions. Guide grooves are provided on the opposite sides of the pair of suspensions. Guide wheels are respectively provided on the two outer lateral sides of the suspension tackle. The guide wheels are slidably arranged in the guide grooves.

6. The bridge crane lifting device according to claim 5, characterized in that, The axle of the guide wheel is an L-shaped axle. The horizontal rod body of the L-shaped axle is arranged longitudinally. The guide wheel is installed on the horizontal rod body of the L-shaped axle through a bearing. A tightening rotating shaft is arranged longitudinally on the vertical rod body of the L-shaped axle. The tightening rotating shaft rotates under the driving of a tightening motor.

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