Lightweight portal crane for shipbuilding

Abstract

The invention belongs to the field of portal cranes, and particularly relates to a shipbuilding light-weight portal crane which comprises a main beam, supporting columns are fixedly connected to the bottom sides of the two ends of the main beam respectively, crane wheel sets are fixedly connected to the bottoms of the two supporting columns, and two trolley rails are fixedly arranged at the top of the main beam. Each trolley track is movably provided with a trolley wheel set and a lifting trolley, the two ends of the main beam are fixedly connected with a plurality of supports respectively, the top of each support is rotationally connected with a traction pulley, the four corners of each trolley wheel set are fixedly connected with a plurality of steel cables respectively, and the end, away from the corresponding trolley wheel set, of each steel cable is connected with a winding component. Each steel cable bypasses the top of the corresponding traction pulley, the position of each traction pulley is higher than the position of the connecting point of the steel cable and the trolley wheel set, the steel cables are tensioned through the winding component, the steel cables can generate upward component force on the lifting trolley so as to offset and share part of load borne by the main beam, and the main beam can be lifted to a certain degree under the same load requirement. And the weight is lower than that of the existing main beam structure.

Description

Technical Field

[0001] The present invention belongs to the field of gantry cranes, and specifically relates to a lightweight gantry crane for shipbuilding. Background Art

[0002] A gantry crane for shipbuilding is a large-scale lifting device specially designed for the shipbuilding industry. It is usually installed in the open working area of a shipyard and is used for hoisting and transporting heavy components such as hull segments, large equipment, and steel plates. Its structure is stable, with a large span and high lifting height, and it can meet the precise hoisting requirements for large-size and heavy-weight components in the shipbuilding process. It usually consists of two rigid legs on both sides and a main beam at the top to form a gantry frame. The legs run along the ground track and are suitable for large-span operations. Its main beam is usually designed with a double-beam or box-shaped structure to bear heavy loads and dynamic loads.

[0003] For existing gantry cranes for shipbuilding, in order to ensure that the main beam can carry large-weight hulls and other structures, the main beam itself needs to meet sufficient structural strength. However, for an ordinary box-shaped structure to ensure structural strength, the self-weight of the main beam is extremely large, resulting in an extremely large total weight of the gantry crane for shipbuilding. Then, during the movement of the crane, the inertia is large, making it difficult and inflexible to start and stop. Moreover, the extremely large self-weight of the main beam will also cause the center of gravity of the gantry crane for shipbuilding to be too high. And gantry cranes for shipbuilding are usually built in open areas such as by the sea and ports, and are extremely vulnerable to strong winds, resulting in severe shaking of the crane and affecting its working stability and safety. Therefore, the need for lightweight design and low center-of-gravity design for gantry cranes for shipbuilding is particularly urgent.

[0004] Chinese Patent with Publication No. CN105936477 discloses a lightweight multi-functional container gantry crane and its anti-sway method. It includes a gantry assembly, traveling trolleys installed at the four corners of the gantry assembly, a hoisting mechanism and a spreader installed on the gantry assembly. The characteristics are as follows: the hoisting mechanism includes a hoisting winch mechanism, a drag-type fixed pulley trolley, and a drag-type traveling winch mechanism. The hoisting winch mechanism is distributed at the lower end of the gantry assembly. The drag-type fixed pulley trolley cooperates with the main beam of the gantry assembly. The drag-type traveling winch mechanism is installed above the main beam. The drag-type fixed pulley trolley is dragged by the drag-type traveling winch mechanism. Each hoisting winch mechanism of this invention is correspondingly distributed at the four corners of the gantry assembly. This position distribution makes the center of gravity of the whole machine move downward, reducing the load weight of the upper structure to achieve the lightweight 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 drive components, without reducing the weight of the main beam, so it cannot play an obvious role in weight reduction to achieve the lightweight of the gantry crane.

[0006] For another example, a Chinese patent with the publication number CN205023753U discloses an arched sling grid type gantry crane for shipbuilding. The crane includes a gantry frame, a high trolley, and a low trolley; the gantry frame includes a main beam structure and two supporting legs; the main beam structure includes an arched upper chord beam and two straight lower chord beams respectively fixed on the two supporting legs; the two lower chord beams are arranged in parallel at intervals from front to back in the horizontal direction, and a set of sling assemblies are provided in front and back between the upper chord beam and the lower chord beam. Each sling in each set of sling assemblies is arranged at intervals from left to right in sequence. The upper ends of the slings are fixedly connected to the upper chord beam, the lower ends of the slings in the front sling assembly are fixedly connected to the front lower chord beam, and the lower ends of the slings in the rear sling assembly are fixedly connected to the rear lower chord beam; the high trolley and the low trolley are installed on the two lower chord beams. This crane uses the cooperation of the arched upper chord beam and the slings to provide tension for the two straight lower chord beams. The load-bearing capacity of the arched structure is better than that of the box-shaped main beam structure. Under the same load requirements, its weight is lower than that of the existing gantry crane, thereby realizing the lightweight design of the gantry crane.

[0007] However, although the arched cantilever structure can reduce the weight of the main beam while ensuring its structural strength in the vertical direction to meet the load requirements, the lateral anti-deformation ability of this structure is poor. If it moves when lifting heavy objects such as the hull, the heavy object with a large inertia will generate lateral stress on the main beam, resulting in lateral deformation of this cantilever structure and ultimately causing damage and even safety hazards. Summary of the Invention

[0008] In order to overcome the deficiencies of the prior art, the technical problem to be solved by the present invention is to set up a winding component to pull the trolley wheel set and the lifting trolley to move through a steel cable, so that there is no need to set a driving component for driving the trolley to move inside the lifting trolley, thereby reducing the weight of the lifting trolley and further reducing the load on the main beam, enabling the main beam to reduce materials to reduce its own weight to meet the lightweight requirement, lowering the center of gravity of the gantry crane for shipbuilding, improving its operating stability and flexibility. By setting the position of the traction pulley higher than the connection point of the steel cable and the trolley wheel set, when the lifting trolley lifts heavy objects such as the hull, the steel cable is tightened through the winding component, and the steel cable will generate an upward component force on the lifting trolley to offset and share part of the load borne by the main beam, so that the load borne by the main beam is directly borne by the pillar. Furthermore, under the same load requirements, the weight of the main beam can be lower than that of the existing main beam structure, thereby realizing the lightweight design of the gantry crane. By setting 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 set, when the gantry crane is loaded and laterally moved, a horizontal component force is generated by the steel cable, thereby weakening the lateral stress generated by the inertia of the loaded heavy object on the main beam, further meeting the lateral anti-deformation ability of the lightweight main beam, enabling the structure and weight of the main beam to be further reduced, and realizing the lightweight design of the gantry crane.

[0009] To achieve the above object, the present invention provides the following technical solution: A lightweight gantry crane for shipbuilding, comprising:

[0010] A main beam, at the bottom sides of both ends of the main beam are respectively fixedly connected with columns, and at the bottoms of the two columns are fixedly connected with crane wheel sets;

[0011] Trolley tracks, two trolley tracks are fixedly arranged on the top of the main beam, on each trolley track is movably arranged a set of trolley wheel sets, and on the two sets are fixedly arranged a hoisting trolley, and a hoisting component is arranged in the hoisting trolley;

[0012] Wherein, at both ends of the main beam are respectively fixedly connected with a plurality of brackets, at the top of each bracket is rotatably connected with a traction pulley, at the four corners of the trolley wheel sets are respectively fixedly connected with a plurality of steel cables, and at one end of each steel cable away from the trolley wheel set is connected with a winding component, and each steel cable bypasses from the top of the corresponding traction pulley.

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

[0014] Further, the distance between two adjacent traction pulleys is greater than the distance between the connection points between the steel cable and the trolley wheel sets.

[0015] Further, the winding component includes a winding frame, at the top of each column at the corresponding position of each steel cable is fixedly connected with a winding frame, in each winding frame is rotatably connected with a winding shaft, and each steel cable is wound around the corresponding winding shaft.

[0016] Further, at one end of each winding frame is fixedly connected with a reducer housing, in each reducer housing is arranged a worm gear fixedly connected with the axis of the winding shaft, in each reducer housing is rotatably connected with a worm that is in meshing transmission connection with the worm gear, on the column is fixedly connected with a motor seat, and at the outside of each motor seat is fixedly connected with a second motor, and each second motor is in transmission connection with the corresponding worm.

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

[0018] Further, at the bottom of the crane wheel set is fixedly connected with an electric control component cabinet, the electric control component cabinet is used for installing control components, and the control components in the electric control component cabinet are electrically connected with the second motor, the torque sensor and the pressure sensor.

[0019] Furthermore, at the corresponding positions of each bracket at both ends of the main beam, a set of first wheel seats are fixedly connected. A first guide wheel is rotatably connected in each set of first wheel seats. At the position below the first guide wheel on each support column, a second wheel seat is fixedly connected. A set of second guide wheels are rotatably connected in each second wheel seat. Each steel cable bypasses the outside of the corresponding first guide wheel and passes between each set of corresponding second guide wheels.

[0020] Furthermore, at the position between the traction pulley and the reel on the support column, a sliding frame is fixedly connected. A third wheel seat is slidably connected in the sliding frame. A set of third guide wheels are rotatably connected to the third wheel seat. Each steel cable passes through the middle of the corresponding set of third guide wheels. A slide bar slidably connected to the third wheel seat is fixedly connected in each sliding frame. A lead screw threadedly connected to the sliding frame is rotatably connected in each sliding frame. A first motor is fixedly connected to one end of each sliding frame. Each first motor is drivingly connected to the corresponding lead screw.

[0021] Furthermore, the steel cable is made by twisting multiple strands of rope bodies. Each rope body is made by twisting multiple steel wires and sisal fibers. The surface of the steel cable is treated with galvanization.

[0022] In summary, compared with the prior art, the beneficial effects of the present invention are as follows:

[0023] (1) By setting up the winding component, the steel cable is used to tow the trolley wheel set and the lifting trolley to move, so that there is no need to set up a driving component for driving the trolley to move inside the lifting trolley, thereby reducing the weight of the lifting trolley and then reducing the load on the main beam, enabling the main beam to reduce materials to reduce its own weight to meet the lightweight requirement, lowering the center of gravity of the gantry crane for shipbuilding, and improving its operating stability and flexibility.

[0024] (2) By setting the height of the traction pulley higher than the connection point of the steel cable and the trolley wheel set, when the lifting trolley lifts heavy objects such as the hull, the steel cable is tightened by the winding component, and then the steel cable will generate an upward component force on the lifting trolley to offset and share part of the load on the main beam, so that the load on the main beam is directly borne by the support column. Furthermore, under the same load requirement, the weight of the main beam can be lower than that of the existing main beam structure, thus realizing the lightweight design of the gantry crane.

[0025] (3) By setting 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 set, when the gantry crane is loaded and horizontally moved, a horizontal component force is generated by the steel cable, thereby weakening the lateral stress on the main beam caused by the inertia of the loaded heavy object, further meeting the anti-lateral deformation ability of the lightweight main beam, enabling the structure and weight of the main beam to be further reduced, and realizing the lightweight design of the gantry crane.

[0026] (4) By arranging 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. By arranging the third wheel seat and the third guide wheel, when the reel winds the steel cable, the third wheel seat is driven to reciprocate horizontally continuously, so that the steel cable is wound more evenly on the outer side of the reel, avoiding the disordered winding of the steel cable on the outer side of the reel, which may cause the steel cable to be wound and released not smoothly enough. Description of the Drawings

[0027] Figure 1 It is a three-dimensional schematic diagram of this patent.

[0028] Figure 2 It is Figure 1 The partial enlarged view at position A in

[0029] Figure 3 It is Figure 1 The partial enlarged view at position B in

[0030] Figure 4 It is Figure 1 The partial enlarged view at position C in

[0031] Figure 5 It is the front view of this patent.

[0032] Figure 6 It is the top view of this patent.

[0033] Figure 7 It is the structural schematic diagram of the winding component of this patent.

[0034] Figure 8 It is the structural schematic diagram of the bracket and the traction pulley.

[0035] Description of the reference numerals: main beam 10; pillar 11; crane wheel set 12; trolley track 13; trolley wheel set 14; lifting trolley 15; steel cable 16; bracket 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; reel 30; reducer housing 31; worm gear 32; worm 33; motor base 34; second motor 35; torque sensor 36; pressure sensor 37; electric control component cabinet 38. Detailed Description of the Invention

[0036] In order to enable the personnel in the technical field to better understand the solution of the present invention, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention.

[0037] As Figures 1-8As shown in the figure, a lightweight gantry crane for shipbuilding includes a main beam 10. At the bottom of both ends of the main beam 10, there are respectively fixed columns 11. At the bottom of each column 11, there is a fixed crane wheel set 12. On the top of each main beam 10, there are two groups of trolley tracks 13 fixedly connected. On each group of trolley tracks 13, there is a set of trolley wheel sets 14 movably arranged. At the top of the two groups of trolley wheel sets 14, there is a fixed lifting trolley 15. Inside the lifting trolley 15, there is a lifting component for lifting heavy objects. At the four corners of the trolley wheel sets 14, there are respectively four steel cables 16 fixedly connected. On the two columns 11, there are respectively four groups of winding components fixedly connected. Each steel cable 16 is connected to the corresponding winding component.

[0038] By setting the winding components, the trolley wheel sets 14 and the lifting trolley 15 are driven to move through the steel cables 16, so that there is no need to set a driving component for driving the trolley to move inside the lifting trolley 15, thereby reducing the weight of the lifting trolley 15 and further reducing the load on the main beam 10, enabling the main beam 10 to reduce materials to reduce its own weight to meet the lightweight requirement, lowering the center of gravity of the gantry crane for shipbuilding, and improving its operation stability and flexibility.

[0039] As Figures 1-8 shown in the figure, at both ends of the main beam 10, there are respectively four symmetrically arranged brackets 17 fixedly connected. At the top of each bracket 17, there is a rotatably connected traction pulley 18. Each steel cable 16 bypasses the outside of the corresponding traction pulley 18. The position of each traction pulley 18 is higher than the position of the connection point between the steel cable 16 and the trolley wheel set 14. The two brackets 17 at the same end of the main beam 10 are arranged in a V shape. The distance between the two traction pulleys 18 at the same end of the main beam 10 is greater than the distance between the connection points between the steel cable 16 and the trolley wheel set 14.

[0040] By setting the position of the traction pulley 18 higher than the connection point between the steel cable 16 and the trolley wheel set 14, when the lifting trolley 15 lifts heavy objects such as the hull, by winding the steel cable 16 tightly through the winding component, the steel cable 16 will generate an upward component force on the lifting trolley 15 to offset and share part of the load on the main beam 10, enabling the load on the main beam 10 to be directly borne by the columns 11. Furthermore, under the same load requirements, the weight of the main beam 10 can be lower than that of the existing main beam structure, thus realizing the lightweight design of the gantry crane.

[0041] At the same time, since the distance between the two traction pulleys 18 at the same end of the main beam 10 is greater than the distance between the connection points between the steel cable 16 and the trolley wheel set 14, when the gantry crane is loaded and horizontally moved, a horizontal component force is generated by the steel cable 16, thereby weakening the lateral stress on the main beam 10 caused by the inertia of the loaded heavy object, further meeting the anti-lateral deformation ability of the lightweight main beam 10, enabling the structure and weight of the main beam 10 to be further reduced, and realizing the lightweight design of the gantry crane.

[0042] As Figures 1-8 shown, the steel cable 16 is made by stranding multiple strands of rope bodies. Each strand of rope body is made by stranding multiple steel wires and sisal fibers. The surface of the steel cable 16 is treated with galvanization.

[0043] By setting the steel cable 16 to be stranded with composite materials, the steel cable 16 can have better tensile strength and anti-fracture ability. And through the galvanization treatment of the surface of the steel cable 16, the steel cable 16 can resist the high-humidity and high-salt environment of the port, reduce the corrosion of the steel cable 16 and improve its service life.

[0044] As Figures 1-8 shown, the retracting component includes a retracting frame 29. A retracting frame 29 is fixedly connected to the outside of each support column 11 at the corresponding position of each steel cable 16. A reel 30 is rotatably connected inside each retracting frame 29. Each steel cable 16 is wound and connected to the reel 30. One end of each retracting frame 29 is fixedly connected to a reducer housing 31. A worm gear 32 fixedly connected to the axis of the reel 30 is arranged inside each reducer housing 31. A worm 33 meshing and drivingly connected to the worm gear 32 is rotatably connected inside each reducer housing 31. A motor base 34 is fixedly connected to the outside of the support column 11 at the corresponding position of each reducer housing 31. A second motor 35 is fixedly connected to one side of each motor base 34. The power output end of each second motor 35 is drivingly connected to the corresponding worm 33.

[0045] By setting the reel 30, the steel cable 16 can be retracted, so as to realize the function of using the steel cable 16 to pull the lifting trolley 15 to move. And by replacing the driving component on the traditional trolley with the retracting component, the self-weight of the lifting trolley 15 is reduced, and then the load of the lifting trolley 15 is reduced, so that the main beam 10 can reduce its weight and achieve a light-weight effect. And by setting the worm gear 32 and the worm 33, the power output by the second motor 35 is decelerated and the torque is increased, so as to increase the output torque of the second motor 35 to be sufficient to pull the trolley and provide pulling force to share the load borne by the main beam 10.

[0046] At the same time, since the transmission mode of the worm gear 32 and the worm 33 has a self-locking characteristic, when the retracting component fails, due to its self-locking characteristic, the reel 30 cannot rotate, so as to keep the pulling force on the steel cable 16 constant, and avoid the problem that the pulling force of the steel cable 16 disappears, resulting in the main beam 10 suddenly bearing too large a load and causing the main beam 10 to bend or be damaged.

[0047] As Figures 1-8As shown in the figure, at both ends of the main beam 10, a set of first wheel seats 19 are fixedly connected at corresponding positions of each bracket 17. A first guide wheel 20 is rotatably connected in each set of first wheel seats 19. A second wheel seat 21 is fixedly connected to each pillar 11 below the first guide wheel 20. A set of second guide wheels 22 are rotatably connected in each second wheel seat 21. Each steel cable 16 bypasses the outside of the corresponding first guide wheel 20 and passes between each set of corresponding second guide wheels 22. A sliding frame 25 is fixedly connected to the pillar 11 between the traction pulley 18 and the reel 30. A third wheel seat 23 is slidably connected in 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 bar 26 slidably connected to the third wheel seat 23 is fixedly connected in each sliding frame 25. A lead screw 27 threadedly connected to the sliding frame 25 is rotatably connected in each sliding frame 25. A first motor 28 is fixedly connected to one end of each sliding frame 25. Each first motor 28 is drivingly connected to the corresponding lead screw 27.

[0048] By arranging 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 arranging the third wheel seat 23 and the third guide wheel 24, when the reel 30 winds the steel cable 16, the third wheel seat 23 is driven to reciprocate horizontally continuously, 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 wound on the outside of the reel 30, resulting in unsmooth winding and releasing of the steel cable 16.

[0049] As Figures 1-8 As shown in the figure, a torque sensor 36 is drivingly connected between the power output end of each second motor 35 and the corresponding worm 33. A plurality of pressure sensors 37 are arranged between the small wheel set 14 and the lifting trolley 15. An electric control component cabinet 38 is fixedly connected to the bottom of the crane wheel set 12. The electric control component cabinet 38 is electrically connected to the second motor 35, the torque sensor 36 and the pressure sensor 37.

[0050] By arranging the torque sensor 36, the torque applied by the second motor 35 to drive the reel 30 to wind can be known, and then the tensile force of the steel cable 16 can be calculated. By arranging the pressure sensor 37, the pressure directly applied by the small wheel set 14 and the lifting trolley 15 to the main beam 10 can be known, and the control components in the electric control component cabinet 38 dynamically read the data and feedback to control the second motor 35 to adjust the output power, so that even when the small wheel set 14 and the lifting trolley 15 are moving, the tensile force on the steel cable 16 can still be kept constant and the tensile force is appropriate, improving the operation stability of this gantry crane.

[0051] The electric control component cabinet 38 located at the bottom of the crane wheel set 12 has a relatively low position, which facilitates the staff to update, maintain, calibrate, repair and other work on the control components and control systems.

[0052] In this embodiment, during operation, the operator first controls the gantry crane to move to the designated lifting position. Subsequently, it is necessary to control the lifting trolley 15 to move above the heavy object to be lifted. Multiple second motors 35 are controlled by the control system to work in coordination with each other. The second motor 35 located 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. At the same time, the second motor 35 located behind the moving direction of the lifting trolley 15 drives the reel 30 to release the steel cable 16. Then the steel cable 16 will pull 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 then the second motor 35 is turned off, and the steel cable 16 no longer pulls the trolley wheel set 14 and the lifting trolley 15 to move.

[0053] During this process, the torque sensor 36 detects the torque output by the second motor 35. The torque sensor 36 transmits the detected data to the control components in the electric control component cabinet 38. The control system automatically calculates the tension borne by the steel cable 16 and performs negative feedback adjustment on the second motor 35 to ensure that the tension on the steel cable 16 is constant and of appropriate magnitude, and at the same time ensure that the continuously changing steel cable 16 remains in a tensioned state, ensuring the stability of the trolley wheel set 14 and the lifting trolley 15 when being pulled and moving.

[0054] Subsequently, the operator controls the lifting components in the lifting trolley 15 to work to lift the target heavy object. During the working process of the lifting components, the load borne by the main beam 10 gradually increases. The pressure sensor 37 can detect the increased value of the load borne on the main beam 10. Thus, the pressure sensor 37 transmits the data to the control system. The control system automatically controls the second motor 35 to drive the reel 30 to tighten the steel cable 16. Then the inclined steel cable 16 will generate a component force in the vertical direction to offset and share the load borne by the main beam 10 and directly transmit the load to the support column 11. Compared with the main beam of the traditional gantry crane, the main beam 10 of this gantry crane can reduce the structure and weight of the main beam under the same load-bearing capacity, and then realize the lightweight design of the gantry crane for shipbuilding, reduce the center of gravity of the gantry crane, and make the movement of the gantry crane more stable and flexible.

[0055] Subsequently, the operator controls the overall movement of the gantry crane as needed, and then moves the hoisted load to the designated position and then stops. Since the load is heavy and has a large inertia, the inertia of the load 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 group 14 and the lifting trolley 15, and since 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 group 14, the steel cable 16 has an inclination angle in the horizontal direction, and the steel cable 16 will also generate a component force in the horizontal direction to offset the lateral force exerted by the load on the main beam 10, thereby ensuring that the lightweight main beam 10 is also sufficient to resist the lateral force and avoid lateral bending of the main beam 10.

[0056] When the reel 30 is in the process of winding and releasing, the control system drives the lead screw 27 to rotate forward and reverse periodically through the first motor 28, so that the third wheel seat 23 slides back and forth with the third guide wheel 24, so that the third guide wheel 24 guides the steel cable 16 so that the steel cable 16 is wound and released more evenly and orderly. When the reel 30 tightens the steel cable 16 to offset the load on the main beam 10, the tension on the steel cable 16 is too great and it is difficult for the third wheel seat 23 and the third guide wheel 24 to pull the steel cable 16 to move. At this time, the first motor 28 is turned off and the third wheel seat 23 and the third guide wheel 24 are no longer driven to slide. In the process of tightening the steel cable 16 to offset the shared load, the length of the steel cable 16 wound by the reel 30 is small. At this time, the third guide wheel 24 does not guide the steel cable 16 and will not cause the problem of disorderly winding of the steel cable 16.

[0057] The above-mentioned crane wheel assembly 12, lifting trolley 15, lifting components, first motor 28, second motor 35, torque sensor 36, pressure sensor 37, etc. are mature existing technologies and are only shown as schematic diagrams or omitted in the drawings and will not be described in detail herein.

[0058] For example, certain words are used in the specification and claims to refer to specific components. Those skilled in the art should understand that hardware manufacturers may use different terms to refer to the same component. This specification and claims do not use differences in names as a way to distinguish components, but use differences in the functions of the components as the criteria for distinction. For example, "including" mentioned throughout the specification and claims is an open term, so it should be interpreted as "including but not limited to". "Approximately" means that within an acceptable error range, those skilled in the art can solve the technical problem within a certain error range and basically achieve the technical effect.

[0059] It should be noted that the term "comprising", "including" or any other variation thereof is intended to cover non-exclusive inclusion, such that a commodity or system comprising a series of elements not only includes those elements but also includes other elements not expressly listed, or elements inherent to such commodity or system. Without further limitation, an element defined by the statement "comprising an..." does not exclude the presence of additional identical elements in the commodity or system comprising said element.

[0060] The above description shows and describes several preferred embodiments of the present application. However, as previously mentioned, it should be understood that the present application is not limited to the forms disclosed herein, should not be regarded as excluding other embodiments, but can be used in various other combinations, modifications and environments, and can be changed within the scope of the application concept described herein through the above teachings or the technology or knowledge in the relevant field. Any changes and variations made by those skilled in the art without departing from the spirit and scope of the present application shall fall within the protection scope of the appended claims of the present application.

Claims

1. A lightweight gantry crane for shipbuilding, characterized in that, The lightweight gantry crane for shipbuilding includes: A main beam (10), wherein the bottom sides of both ends of the main beam (10) are respectively fixedly connected to pillars (11), and the bottoms of the two pillars (11) are fixedly connected to crane wheel sets (12); Trolley tracks (13), two trolley tracks (13) are fixedly provided on the top of the main beam (10), a group of trolley wheel groups (14) are movably provided on each of the trolley tracks (13), and a lifting trolley (15) is fixedly provided on the two groups, and a lifting component is provided in the lifting trolley (15); Wherein, a plurality of brackets (17) are fixedly connected to both ends of the main beam (10), a traction pulley (18) is rotatably connected to the top of each bracket (17), a plurality of steel cables (16) are fixedly connected to the four corners of the trolley group (14), an end of each steel cable (16) away from the trolley group (14) is connected to a winding component, and each steel cable (16) passes over the top of the corresponding traction pulley (18).

2. The lightweight gantry crane for shipbuilding according to claim 1, characterized in that, The position of each traction sheave (18) is higher than the position of the connection point between the steel cable (16) and the trolley group (14).

3. The lightweight gantry crane for shipbuilding according to claim 1, characterized in that, The distance between two adjacent traction sheaves (18) is greater than the distance between the connection points of the steel cable (16) and the small wheel group (14).

4. A lightweight gantry crane for shipbuilding according to claim 1, characterized in that, The reeling component comprises a reeling frame (29), the tops of the two pillars (11) are fixedly connected to the reeling frame (29) at positions corresponding to each steel cable (16), a reel (30) is rotatably connected inside each reeling frame (29), and each steel cable (16) is wound and reeled on the corresponding reel (30).

5. The lightweight gantry crane for shipbuilding according to claim 4, characterized in that One end of each reeling frame (29) is fixedly connected to a reducer housing (31), and a worm gear (32) fixedly connected to the axis of the reel (30) is provided in each reducer housing (31). A worm (33) meshingly connected to the worm gear (32) is rotatably connected in each reducer housing (31). A motor seat (34) is fixedly connected to the pillar (11), and a second motor (35) is fixedly connected to the outside of each motor seat (34). Each second motor (35) is transmission-connected to the corresponding worm gear (33).

6. The lightweight gantry crane for shipbuilding according to claim 5, characterized in that, A torque sensor (36) is connected between each second motor (35) and the worm (33), and a pressure sensor (37) is provided between the small wheel group (14) and the lifting trolley (15).

7. The lightweight gantry crane for shipbuilding according to claim 6, wherein, An electric control component cabinet (38) is fixedly connected to the bottom of the crane wheel assembly (12). The electric control component cabinet (38) is used to install control components. The control components in the electric control component cabinet (38) are electrically connected to the second motor (35), the torque sensor (36) and the pressure sensor (37).

8. A lightweight gantry crane for shipbuilding according to claim 4, characterized in that, At both ends of the main beam (10), a set of first wheel seats (19) are fixedly connected at corresponding positions of each support (17). A first guide wheel (20) is rotatably connected in each set of the first wheel seats (19). A second wheel seat (21) is fixedly connected to each of the struts (11) at a position below the first guide wheel (20). A set of second guide wheels (22) are rotatably connected in each of the second wheel seats (21). Each steel cable (16) bypasses the outside of the corresponding first guide wheel (20) and passes through between each set of corresponding second guide wheels (22).

9. The lightweight gantry crane for shipbuilding according to claim 8, characterized in that, A sliding frame (25) is fixedly connected to the strut (11) at a position between the traction pulley (18) and the reel (30). A third wheel seat (23) is slidably connected in 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 a corresponding set of third guide wheels (24). A slide bar (26) fixedly connected to the sliding frame (25) and slidably connected to the third wheel seat (23) is provided in each sliding frame (25). A lead screw (27) threadedly connected to the sliding frame (25) is rotatably connected in each sliding frame (25). A first motor (28) is fixedly connected to one end of each sliding frame (25). Each first motor (28) is drivingly connected to the corresponding lead screw (27).

10. The lightweight gantry crane for shipbuilding according to claim 1, characterized in that, The steel cable (16) is made by stranding multiple strands of rope bodies. Each rope body is made by stranding multiple steel wires and sisal fibers. The surface of the steel cable (16) is treated with galvanization.

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