Lightweight gantry crane for shipbuilding

Abstract

The application belongs to the field of gantry cranes, and particularly relates to a lightweight gantry crane for shipbuilding, which comprises a main beam, the bottom sides of both ends of the main beam are fixedly connected with support columns, the bottom of each support column is fixedly connected with a crane wheel set, the top of the main beam is fixedly provided with two trolley tracks, a trolley wheel set and a lifting trolley are movably arranged on each trolley track, a plurality of supports are fixedly connected to both ends of the main beam, a traction sheave is rotatably connected to the top of each support, a plurality of steel ropes are fixedly connected to the four corners of the trolley wheel set, one end of each steel rope away from the trolley wheel set is connected with a winding part, each steel rope passes over the top of the corresponding traction sheave, and the position of each traction sheave is higher than the position of the connection point of the steel rope and the trolley wheel set. By tightening the steel rope through the winding part, the steel rope generates an upward component force on the lifting trolley, so as to offset and share part of the load borne by the main beam, and the weight of the main beam is lower than that of the existing main beam structure under the same load requirement.

Description

TECHNICAL FIELD

[0001] The application belongs to the field of gantry cranes, in particular to a lightweight gantry crane for shipbuilding. BACKGROUND

[0002] The gantry crane for shipbuilding is a large lifting equipment specially designed for the shipbuilding industry, usually installed in the open operation area of the shipyard, used for lifting and transporting heavy components such as ship sections, large equipment, steel plates, etc. It has stable structure, large span and high lifting height, and can meet the precise lifting requirements of large size and heavy weight components in shipbuilding process. It is usually composed of a door-shaped frame with two rigid legs and a top beam. The legs walk along the ground track and are suitable for large-span operation. The main beam is usually designed with double-beam or box-type structure to withstand heavy load and dynamic load.

[0003] The existing gantry crane for shipbuilding needs to ensure that the main beam can bear the large weight of the ship body structure, so the main beam itself needs to meet sufficient structural strength. However, the ordinary box-type structure needs to ensure the structural strength, which makes the self-weight of the main beam extremely large, resulting in the overall weight of the gantry crane for shipbuilding being extremely large. During the movement of the crane, the inertia is large, which makes it difficult to start and stop and not flexible enough. Moreover, the large self-weight of the main beam also leads to a high center of gravity of the gantry crane for shipbuilding. The gantry crane for shipbuilding is usually built in open areas such as seashores and ports, which are easily affected by strong winds, causing the crane to shake violently, affecting its stability and safety. Therefore, the lightweight design and low center of gravity design of the gantry crane for shipbuilding are particularly urgent.

[0004] Chinese patent CN105936477 discloses a lightweight multifunctional container gantry crane and its anti-shaking method. It includes a door frame assembly, a walking trolley installed on the four corners of the door frame assembly, a lifting mechanism installed on the door frame assembly, and a lifting appliance. The lifting mechanism includes a lifting winch mechanism, a drag-type fixed pulley trolley, and a drag-type walking winch mechanism. The lifting winch mechanism is distributed at the lower end of the door frame assembly, the drag-type fixed pulley trolley cooperates with the main beam of the door frame assembly, and the drag-type walking winch mechanism is installed above the main beam. The drag-type fixed pulley trolley is dragged by the drag-type walking winch mechanism. Each lifting winch mechanism of this invention is distributed on the four corners of the door frame assembly. This distribution of positions makes the center of gravity of the whole machine lower, reduces the load weight of the upper structure, and realizes the lightweight structure of the container gantry crane itself.

[0005] However, this invention only reduces the weight of the trolley and only reduces the weight of the trolley traction driving components. It does not reduce the weight of the main beam, so it cannot achieve obvious weight reduction to realize the lightweight of the gantry crane.

[0006] For example, the Chinese patent with publication number CN205023753U discloses a shipbuilding arch-shaped sling lattice portal crane, which comprises a portal frame, a high trolley and a low trolley. The portal frame comprises a main beam structure and two supporting legs. The main beam structure comprises an arch-shaped upper chord beam and two straight lower chord beams fixed on the two supporting legs respectively. The two lower chord beams are arranged in parallel and spaced apart in the horizontal direction from front to back. A front and back group of sling assemblies are arranged between the upper chord beam and the lower chord beams. Each sling in each group of sling assemblies is arranged in sequence and spaced apart from left to right. The upper end of each sling is fixedly connected with the upper chord beam. The lower end of each sling in the front sling assembly is fixedly connected with the front lower chord beam. The lower end of each sling in the rear sling assembly is fixedly connected with the rear lower chord beam. The high trolley and the low trolley are installed on the two lower chord beams. The crane uses the cooperation of the arch-shaped upper chord beam and the slings to provide tension to the two straight lower chord beams. The load-bearing capacity of the arch-shaped structure is better than that of the box-shaped main beam structure. Under the same load requirement, the weight of the crane is lower than that of the existing portal crane, thereby realizing the lightweight design of the portal crane.

[0007] However, although the arch-shaped suspension beam structure can reduce the weight of the main beam while ensuring the vertical structural strength to meet the load requirement, the transverse deformation resistance of this structure is poor. When the crane moves during lifting of a heavy object such as a ship body, the inertia of the heavy object will generate transverse stress on the main beam, causing the suspension beam structure to deform transversely and eventually causing damage and safety hazards. SUMMARY

[0008] The present application overcomes the shortcomings of the prior art and solves the technical problem by providing a winding component, a steel cable traction trolley wheel set and a lifting trolley. The lifting trolley does not need to be provided with a driving component for driving the trolley to move, thereby reducing the weight of the lifting trolley and the load on the main beam, allowing the main beam to be made of less material to reduce the self-weight of the main beam and achieve lightweight design. The center of gravity of the shipbuilding portal crane is lowered, and the running stability and flexibility are improved. The height of the traction sheave is higher than the height of the connection point between the steel cable and the trolley wheel set. When the lifting trolley lifts a heavy object such as a ship body, the steel cable is pulled tight by the winding component, generating an upward component force on the lifting trolley to offset part of the load on the main beam, so that the load on the main beam is directly borne by the support column. The weight of the main beam is lower than that of the existing main beam structure under the same load requirement, thereby realizing lightweight design of the portal crane. The distance between the two traction sheaves at the same end of the main beam is greater than the distance between the connection points of the steel cable and the trolley wheel set. During the process of loading and transverse movement of the portal crane, the steel cable generates a horizontal component force, thereby reducing the transverse stress on the main beam caused by the inertia of the heavy object, further improving the transverse deformation resistance of the lightweight main beam, and further reducing the structure and weight of the main beam to realize lightweight design of the portal crane.

[0009] In order to achieve the above object, the present application provides the following technical scheme: a lightweight gantry crane for shipbuilding, comprising:

[0010] a main beam, two ends of the main beam are fixedly connected with a support on the bottom side respectively, and the bottom of the two supports is fixedly connected with a crane wheel set;

[0011] a trolley rail, the top of the main beam is fixedly provided with two trolley rails, a group of trolley wheel sets is movably arranged on each trolley rail, a lifting trolley is fixedly arranged on the two groups, and a lifting component is arranged in the lifting trolley;

[0012] wherein, a plurality of supports are fixedly connected to the two ends of the main beam respectively, a traction sheave is rotatably connected to the top of each support, a plurality of steel ropes are fixedly connected to the four corners of the trolley wheel set respectively, a winding component is connected to the end of each steel rope away from the trolley wheel set, and each steel rope passes over the top of the corresponding traction sheave.

[0013] Further, the position of each traction sheave is higher than the position of the connection point of the steel rope and the trolley wheel set.

[0014] Further, the distance between the two adjacent traction sheaves is greater than the distance between the connection points of the steel rope and the trolley wheel set.

[0015] Further, the winding component comprises a winding frame, a winding frame is fixedly connected to the top of each support at the corresponding position of each steel rope, a winding shaft is rotatably connected in each winding frame, and each steel rope is wound on the corresponding winding shaft.

[0016] Further, a speed reducer housing is fixedly connected to one end of each winding frame, a worm gear fixedly connected with the shaft of the winding shaft is arranged in each speed reducer housing, a worm rotatably connected in transmission connection with the worm gear is arranged in each speed reducer housing, a motor seat is fixedly connected to the support, a second motor is fixedly connected to the outer side of each motor seat, and each second motor is in transmission connection with the corresponding worm.

[0017] Further, a torque sensor is connected between each second motor and the worm, and a pressure sensor is arranged between the trolley wheel set and the lifting trolley.

[0018] Further, an electric control element cabinet is fixedly connected to the bottom of the crane wheel set, the electric control element cabinet is used for installing control elements, and the control elements in the electric control element cabinet are electrically connected between the second motor, the torque sensor and the pressure sensor.

[0019] Further, the main beam is fixedly connected with a group of first wheel seats at the corresponding positions of each support, a first guide wheel is rotatably connected in each first wheel seat, a second wheel seat is fixedly connected below the first guide wheel on each support, a group of second guide wheels are rotatably connected in each second wheel seat, and each steel cable passes through between a corresponding group of second guide wheels from the outside of the corresponding first guide wheel.

[0020] Further, a sliding frame is fixedly connected between the traction pulley and the reel on the support, a third wheel seat is slidably connected in the sliding frame, a group of third guide wheels are rotatably connected on the third wheel seat, each steel cable passes through the middle of a corresponding group of third guide wheels, a slide rod that is slidably connected with the third wheel seat is fixedly connected in each sliding frame, a lead screw that is threadedly connected with the sliding frame is rotatably connected in each sliding frame, a first motor is fixedly connected to one end of each sliding frame, and each first motor is drivingly connected with the corresponding lead screw.

[0021] Further, the steel cable is made of a plurality of rope bodies twisted together, each rope body is made of a plurality of steel wire ropes and sisal fiber twisted together, and the surface of the steel cable is subjected to galvanizing treatment.

[0022] In summary, compared with the prior art, the beneficial effects of the present application are that:

[0023] (1) By arranging the reel component, the steel cable traction trolley wheel group and the lifting trolley are moved, so that the driving component for driving the movement of the trolley does not need to be arranged inside the lifting trolley, thereby reducing the weight of the lifting trolley and further reducing the load on the main beam, so that the main beam can reduce the material to reduce the self-weight of the main beam to meet the lightweight requirement, reduce the center of gravity of the shipbuilding gantry crane, and improve its running stability and flexibility.

[0024] (2) By arranging the traction pulley at a height higher than the height of the connection point of the steel cable and the trolley wheel group, when the lifting trolley lifts heavy objects such as ship bodies, the steel cable is pulled tight by the reel component, which generates an upward component force on the lifting trolley to offset part of the load on the main beam, so that the load on the main beam is directly borne by the support, thereby the weight of the main beam can be lower than that of the existing main beam structure under the same load requirement, and the lightweight design of the gantry crane is realized.

[0025] (3) By arranging the distance between the two traction pulleys at the same end of the main beam to be greater than the distance between the connection points of the steel cable and the trolley wheel group, the horizontal component force of the steel cable is utilized to weaken the lateral stress on the main beam caused by the inertia of the loaded heavy object during the process of load and transverse movement, further satisfying the lateral deformation resistance of the lightweight main beam, so that the structure and weight of the main beam can be further reduced, and the lightweight design of the gantry crane is realized.

[0026] (4) By setting the first guide wheel and the second guide wheel to guide the steel cable, the stability of the steel cable when the winding component winds and pulls the steel cable is improved, and by setting the third wheel seat and the third guide wheel, the third wheel seat is continuously reciprocated transversely when the winding shaft winds the steel cable, so that the steel cable is more uniformly wound outside the winding shaft, and the disorderly winding of the steel cable wound outside the winding shaft is avoided, so that the winding and releasing of the steel cable is not smooth. BRIEF DESCRIPTION OF DRAWINGS

[0027] Figure 1 is a perspective view of the present patent.

[0028] Figure 2 is a partial enlarged view of A in the figure. Figure 1

[0029] Figure 3 is a partial enlarged view of B in the figure. Figure 1

[0030] Figure 4 is a partial enlarged view of C in the figure. Figure 1

[0031] Figure 5 is a front view of the present patent.

[0032] Figure 6 is a top view of the present patent.

[0033] Figure 7 is a structure schematic view of the winding component of the present patent.

[0034] Figure 8 is a structure schematic view of the support and traction pulley.

[0035] BRIEF DESCRIPTION OF DRAWINGS: main girder 10; support column 11; crane wheel set 12; trolley rail 13; trolley wheel set 14; hoisting trolley 15; steel cable 16; support 17; traction pulley 18; first wheel seat 19; first guide wheel 20; second wheel seat 21; second guide wheel 22; third wheel seat 23; third guide wheel 24; sliding frame 25; sliding rod 26; lead screw 27; first motor 28; winding frame 29; winding shaft 30; speed reducer housing 31; worm gear 32; worm 33; motor base 34; second motor 35; torque sensor 36; pressure sensor 37; electric control element cabinet 38. DETAILED DESCRIPTION

[0036] In order for those skilled in the art to better understand the present application, the technical solutions in the embodiments of the present application will be described clearly and completely in conjunction with the drawings in the embodiments of the present application.

[0037] As Figures 1-8 ​​​As shown, a lightweight gantry crane for shipbuilding includes a main beam 10, the bottom of each end of the main beam 10 is fixedly connected with a support column 11, the bottom of each support column 11 is fixedly connected with a crane wheel set 12, the top of each main beam 10 is fixedly connected with two groups of trolley rails 13, each group of trolley rails 13 is movably provided with a group of trolley wheel sets 14, the top of the two groups of trolley wheel sets 14 is fixedly connected with a lifting trolley 15, the lifting trolley 15 is provided with a lifting component for lifting heavy objects, the four corners of each trolley wheel set 14 are fixedly connected with four steel wires 16, four groups of winding components are respectively fixedly connected on the two support columns 11, and each steel wire 16 is connected with a corresponding winding component.

[0038] By setting the winding component, the trolley wheel set 14 and the lifting trolley 15 are moved by the steel wire 16, so that the driving component for driving the trolley to move does not need to be arranged inside the lifting trolley 15, thereby reducing the weight of the lifting trolley 15 and further reducing the load on the main beam 10, so that the main beam 10 can reduce the material to reduce the self-weight of the main beam 10 to achieve the lightweight requirement, reduce the gravity center of the gantry crane for shipbuilding, and improve the operation stability and flexibility thereof.

[0039] As shown, Figures 1-8 the two ends of the main beam 10 are respectively fixedly connected with four mutually symmetrical supports 17, the top of each support 17 is rotatably connected with a traction sheave 18, each steel wire 16 passes outside the corresponding traction sheave 18, the position of each traction sheave 18 is higher than that of the connection point of the steel wire 16 and the trolley wheel set 14, the two supports 17 located at the same end of the main beam 10 are arranged in a V shape, and the distance between the two traction sheaves 18 located at the same end of the main beam 10 is greater than the distance between the connection points of the steel wire 16 and the trolley wheel set 14.

[0040] By setting the position of the traction sheave 18 to be higher than the height of the connection point of the steel wire 16 and the trolley wheel set 14, when the lifting trolley 15 lifts the ship body and other heavy objects, the steel wire 16 is pulled tight by the winding component, so that the steel wire 16 generates an upward component force on the lifting trolley 15 to offset part of the load on the main beam 10, so that the load on the main beam 10 is directly borne by the support column 11, thereby the weight of the main beam 10 can be lower than that of the existing main beam structure under the same load requirement, thereby realizing the lightweight design of the gantry crane.

[0041] At the same time, since the distance between the two traction sheaves 18 located at the same end of the main beam 10 is greater than the distance between the connection points of the steel wire 16 and the trolley wheel set 14, the horizontal component force of the steel wire 16 is utilized in the process of loading and transverse movement of the gantry crane, thereby weakening the transverse stress on the main beam 10 generated by the inertia of the loaded heavy object, further satisfying the transverse deformation resistance of the lightweight main beam 10, so that the structure and weight of the main beam 10 can be further reduced, and the lightweight design of the gantry crane is realized.

[0042] As shown in Figures 1-8 Steel cable 16 is made of multiple strands, each strand is made of multiple steel wires and sisal fibers. The surface of steel cable 16 is galvanized.

[0043] The use of composite materials for steel cable 16 provides better tensile strength and fracture resistance. The galvanizing treatment on the surface of steel cable 16 makes it resistant to high humidity and high salt environment in the port, reducing corrosion and improving service life.

[0044] As shown in Figures 1-8 Each winding frame 29 is fixedly connected to the outside of each support 11 at a corresponding position of each steel cable 16. Each winding frame 29 is rotatably connected to a winding shaft 30. Each steel cable 16 is wound around the winding shaft 30. One end of each winding frame 29 is fixedly connected to a reducer housing 31. A worm gear 32 is fixedly connected to the shaft of the winding shaft 30 in each reducer housing 31. A worm gear 33 is rotatably connected in each reducer housing 31 and is in meshing transmission connection with the worm gear 32. An electric motor base 34 is fixedly connected to the outside of each support 11 at a corresponding position of each reducer housing 31. A second electric motor 35 is fixedly connected to one side of each electric motor base 34. The power output end of each second electric motor 35 is in transmission connection with the corresponding worm gear 33.

[0045] The winding shaft 30 can wind the steel cable 16, realizing the function of using the steel cable 16 to pull the trolley 15 to move. The winding component replaces the driving component on the traditional trolley, reducing the self-weight of the hoisting trolley 15 and the load of the hoisting trolley 15, so that the main beam 10 can be reduced in weight to achieve lightweight effect. The worm gear 32 and the worm gear 33 reduce the power output of the second electric motor 35 to increase the torque, so that the output torque of the second electric motor 35 is sufficient to pull the trolley and provide tension to share the load on the main beam 10.

[0046] At the same time, the transmission mode of the worm gear 32 and the worm gear 33 has self-locking characteristics. When the winding component fails, the winding shaft 30 cannot rotate due to the self-locking characteristics, so the tension on the steel cable 16 remains constant, avoiding the problem of sudden bending or damage of the main beam 10 caused by the sudden disappearance of the tension on the steel cable 16 leading to the main beam 10 bearing excessive load.

[0047] As shown in Figures 1-8As shown, a set of first wheel seats 19 are fixedly connected to both ends of the main beam 10 at corresponding positions on each support 17. A first guide wheel 20 is rotatably connected within each set of first wheel seats 19. A second wheel seat 21 is fixedly connected to each support 11 below the first guide wheel 20. A set of second guide wheels 22 is rotatably connected within each second wheel seat 21. Each steel cable 16 passes around the outside of the corresponding first guide wheel 20 and through the spaces between the corresponding sets of second guide wheels 22. A sliding pulley is fixedly connected to the support 11 between the traction pulley 18 and the reel 30. The moving frame 25 has a third wheel seat 23 slidably connected inside the sliding frame 25. A set of third guide wheels 24 are rotatably connected to the third wheel seat 23. Each steel cable 16 passes through the middle of the corresponding set of third guide wheels 24. A slide rod 26 that is slidably connected to the third wheel seat 23 is fixedly connected inside each sliding frame 25. A lead rod 27 that is threadedly connected to the sliding frame 25 is rotatably connected inside each sliding frame 25. A first motor 28 is fixedly connected to one end of each sliding frame 25. Each first motor 28 is driven by the corresponding lead rod 27.

[0048] By setting the first guide wheel 20 and the second guide wheel 22 to guide the steel cable 16, the stability of the steel cable 16 when the winding component winds and pulls the steel cable 16 is improved. By setting the third wheel seat 23 and the third guide wheel 24, the third wheel seat 23 is driven to move back and forth continuously when the reel 30 winds the steel cable 16, so that the steel cable 16 is wound more evenly on the outside of the reel 30, avoiding the disordered winding of the steel cable 16 on the outside of the reel 30, which would result in insufficient smoothness when winding and releasing the steel cable 16.

[0049] like Figures 1-8 As shown, a torque sensor 36 is connected between the power output end of each second motor 35 and the corresponding worm gear 33. Multiple pressure sensors 37 are installed between the trolley wheel assembly 14 and the lifting trolley 15. An electrical control component cabinet 38 is fixedly connected to the bottom of the crane wheel assembly 12. The electrical control component cabinet 38 is electrically connected to the second motor 35, the torque sensor 36 and the pressure sensor 37.

[0050] By setting a torque sensor 36, the torque applied by the second motor 35 driving the reel 30 to rewind can be known, and the tension on the steel cable 16 can be calculated. By setting a pressure sensor 37, the pressure directly applied to the main beam 10 by the trolley wheel assembly 14 and the lifting trolley 15 can be known. The control element in the electrical control component cabinet 38 dynamically reads the data and feeds back to control the second motor 35 to adjust the output power. This ensures that even when the trolley wheel assembly 14 and the lifting trolley 15 are moving, the tension on the steel cable 16 can remain constant and the tension can be appropriate, thus improving the stability of the gantry crane operation.

[0051] The electric control element cabinet 38 at the bottom of the crane wheel set 12 is low in position, which facilitates the staff to update, maintain, calibrate, repair and the like of the control elements and the control system.

[0052] In the embodiment, in operation, the operator first controls the portal crane to move to a designated lifting position, and then controls the lifting trolley 15 to move above the heavy object to be lifted. The control system controls the multiple second electric motors 35 to work in coordination with each other. The second electric motor 35 in front of the moving direction of the lifting trolley 15 drives the reel 30 to wind up the steel cable 16 through the transmission of the worm gear 32 and the worm 33, while the second electric motor 35 behind the moving direction of the lifting trolley 15 drives the reel 30 to release the steel cable 16. Then the steel cable 16 pulls the lifting trolley 15 and the trolley wheel set 14 to move on the trolley track 13 until the lifting trolley 15 moves to the designated position and the second electric motor 35 is turned off. Then the steel cable 16 no longer pulls the trolley wheel set 14 and the lifting trolley 15 to move.

[0053] In the process, the torque sensor 36 detects the torque output by the second electric motor 35, and the torque sensor 36 transmits the detection data to the control elements in the electric control element cabinet 38. The control system automatically calculates the tension on the steel cable 16 and performs negative feedback adjustment on the second electric motor 35 to ensure that the tension on the steel cable 16 is constant and appropriate in size, and to ensure that the constantly changing steel cable 16 remains in a tensioned state, thereby ensuring the stability of the trolley wheel set 14 and the lifting trolley 15 when being pulled to move.

[0054] Then the operator controls the lifting components in the lifting trolley 15 to work to lift the target heavy object. In the working process of the lifting components, the load on the main beam 10 gradually increases, and the pressure sensor 37 can detect the increase of the load on the main beam 10. Then the pressure sensor 37 transmits the data to the control system, and the control system automatically controls the second electric motor 35 to drive the reel 30 to tighten the steel cable 16. Then the inclined steel cable 16 generates a component force in the vertical direction to offset and share the load on the main beam 10 and directly transmit the load to the support column 11. Compared with the main beam of the conventional portal crane, the main beam 10 of the portal crane can reduce the structure and weight of the main beam under the same load bearing capacity, thereby realizing the lightweight design of the portal crane for shipbuilding, reducing the center of gravity of the portal crane, and making the movement of the portal crane more stable and flexible.

[0055] Subsequently, the operator controls the overall movement of the gantry crane as needed, and then moves the hoisted heavy object to the designated position and stops. Since the heavy object is heavy and has a large inertia, the inertia of the heavy object will generate a horizontal force on the main beam 10 when the gantry crane starts and stops. At this time, the steel cable 16 pulls the trolley wheel set 14 and the hoisting trolley 15, and the distance between the two adjacent traction pulleys 18 is greater than the distance between the connection points of the steel cable 16 and the trolley wheel set 14, so that the steel cable 16 has an inclination in the horizontal direction, and the steel cable 16 also generates a horizontal component force, which offsets the lateral force exerted by the heavy object on the main beam 10, thereby ensuring that the lightweight main beam 10 can also resist the lateral force and avoid lateral bending of the main beam 10.

[0056] During the winding and unwinding of the reel 30, the control system periodically drives the lead screw 27 to rotate forward and reverse by the first motor 28, so that the third wheel seat 23 and the third guide wheel 24 continuously slide back and forth, and the third guide wheel 24 guides the steel cable 16 to be wound and unwound more uniformly and orderly. When the reel 30 tightens the steel cable 16 to offset the load on the main beam 10, the excessive tension on the steel cable 16 makes it difficult for the third wheel seat 23 and the third guide wheel 24 to pull the steel cable 16 to move, so the first motor 28 is turned off to stop driving the third wheel seat 23 and the third guide wheel 24 to slide. During the process of tightening the steel cable 16 to offset the load, the length of the steel cable 16 wound by the reel 30 is small, so the third guide wheel 24 does not guide the steel cable 16 and does not cause the steel cable 16 to be out of order.

[0057] The crane wheel set 12, the hoisting trolley 15, the hoisting component, the first motor 28, the second motor 35, the torque sensor 36, the pressure sensor 37, etc. are mature existing technologies, and are only schematically shown or omitted in the drawings. Therefore, they will not be described here.

[0058] As used in the specification and claims, certain terminology is used to refer to specific components. Those skilled in the art will appreciate that hardware manufacturers can use different names to refer to the same component. The specification and claims do not distinguish components by the difference in name, but by the difference in function. As used throughout the specification and claims, "comprising" is an open term, so that it is interpreted to "comprise, but not limited to." "Substantially" means within acceptable error amounts, expected by those of ordinary skill in the art. Those of ordinary skill in the art will recognize that the technical effects described herein can be achieved with some error, and that the technical effects are substantially achieved.

[0059] It is to be understood that the terminology "including", "comprising", or any other variation thereof, is intended to cover a non-exclusive inclusion such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but can include other elements not expressly listed or inherent to such process, method, article, or apparatus. An element proceeded by "comprises a... " does not, without more constraints, exclude the existence of additional identical elements in the process, method, article, or apparatus that comprises the element.

[0060] The foregoing specification has been set forth to illustrate and describe the preferred embodiments of the present application and is not intended to be exhaustive or to be construed as limiting the application to the precise forms disclosed. As mentioned above, the above specification is presented to enable any person skilled in the art to make and use the application as claimed in the patent. Many modifications and variations of the present application are possible in light of this teaching and the principles of the application disclosed above. It is intended that the scope of the application be defined by the claims appended hereto rather than by the description presented above.

Claims

1. A lightweight gantry crane for shipbuilding, characterized by, The shipbuilding lightweight gantry crane comprises: a main beam (10), two ends of the main beam (10) are fixedly connected with a support (11) respectively, and the bottom of each support (11) is fixedly connected with a crane wheel set (12); a trolley rail (13), the top of the main beam (10) is fixedly provided with two trolley rails (13), a group of trolley wheel sets (14) are movably arranged on each trolley rail (13), and a lifting trolley (15) is fixedly arranged on the two groups of trolley wheel sets (14); wherein, four supports (17) are fixedly connected with the two ends of the main beam (10) respectively, the top of each support (17) is rotatably connected with a traction sheave (18), four steel wires (16) are fixedly connected with the four corners of each trolley wheel set (14) respectively, one end of each steel wire (16) away from the trolley wheel set (14) is connected with a winding component, and each steel wire (16) passes over the top of the corresponding traction sheave (18); the position of each traction sheave (18) is higher than the position of the connecting point of the steel wire (16) and the trolley wheel set (14), the two supports (17) located at the same end of the main beam (10) are arranged in a V shape, and the distance between the two traction sheaves (18) located at the same end of the main beam (10) is greater than the distance between the connecting points of the steel wires (16) and the trolley wheel sets (14); the winding component comprises a winding frame (29), the top of each support (11) is fixedly connected with a winding frame (29) at the corresponding position of each steel wire (16), a winding shaft (30) is rotatably connected in each winding frame (29), and each steel wire (16) is wound on the corresponding winding shaft (30); one end of each winding frame (29) is fixedly connected with a speed reducer housing (31), a worm wheel (32) fixedly connected with the shaft of the winding shaft (30) is arranged in each speed reducer housing (31), a worm (33) in meshing transmission connection with the worm wheel (32) is rotatably connected in each speed reducer housing (31), a motor seat (34) is fixedly connected to the support (11), a second motor (35) is fixedly connected to the outer side of each motor seat (34), each second motor (35) is in transmission connection with the corresponding worm (33), a torque sensor (36) is connected and arranged between each second motor (35) and the worm (33), and a pressure sensor (37) is arranged between the trolley wheel set (14) and the lifting trolley (15).

2. A light-weight portal crane for shipbuilding according to claim 1, characterized in that An electric control element cabinet (38) is fixedly connected to the bottom of the crane wheel set (12), the electric control element cabinet (38) is used for mounting control elements, and the control elements in the electric control element cabinet (38) are electrically connected with the second motor (35), the torque sensor (36) and the pressure sensor (37).

3. The light-weight portal crane for shipbuilding according to claim 1, characterized in that, The main girder (10) is fixedly connected with a set of first wheel seats (19) at the corresponding positions of each support (17), each set of the first wheel seats (19) is rotatably connected with a first guide wheel (20), each support (11) is fixedly connected with a second wheel seat (21) below the first guide wheel (20), each second wheel seat (21) is rotatably connected with a set of second guide wheels (22), and each steel cable (16) passes through between each set of corresponding second guide wheels (22) from the outside of the corresponding first guide wheel (20).

4. A light-weight portal crane for shipbuilding according to claim 3, characterized in that The support (11) is fixedly connected with a sliding frame (25) between the traction pulley (18) and the reel (30), the sliding frame (25) is slidably connected with a third wheel seat (23), the third wheel seat (23) is rotatably connected with a set of third guide wheels (24), each steel cable (16) passes through between the corresponding set of third guide wheels (24), each sliding frame (25) is fixedly connected with a sliding rod (26) slidably connected with the third wheel seat (23), each sliding frame (25) is rotatably connected with a lead screw (27) threadedly connected with the sliding frame (25), one end of each sliding frame (25) is fixedly connected with a first motor (28), and each first motor (28) is drivingly connected with the corresponding lead screw (27).

5. A light-weight portal crane for shipbuilding according to claim 1, characterized in that, The steel cable (16) is made of a plurality of rope bodies twisted together, each rope body is made of a plurality of steel wire ropes and sisal fiber twisted together, and the surface of the steel cable (16) is subjected to galvanizing treatment.

Images