A method of using a gantry crane

Abstract

The application provides a gantry crane use method, solves the problem of steel wire rope and beam interference and hidden danger in traditional hoisting cross obstacle operation. The method adopts a gantry crane provided with a beam with a hollow guide rail, and an upper trolley and a lower trolley which can be independently or jointly moved. The upper trolley is provided with double lifting hooks with a spacing of 14-17 meters, and the lower trolley lifting hook is arranged through the hollow guide rail. During operation, the site working condition and obstacle condition are first judged. If there is no obstacle, various hoisting modes can be flexibly selected. If there is a cross obstacle risk, the type is first selected according to the component lifting ring spacing, and then the steel wire rope interference condition is judged by combining simulation and mechanical calculation to determine whether to use the upper trolley double hook or the lower trolley single hook for hoisting. After the scheme is selected, the lifting ring and the hook are connected, and the trial hoisting inspection is carried out before formal hoisting. The application can simulate the cross obstacle working condition and select the hoisting scheme in advance, effectively avoid interference and hidden danger, and improve the component hoisting adaptability, safety and operation efficiency of the cross obstacle operation.

Description

Technical Field

[0001] This invention belongs to the field of shipbuilding technology, specifically relating to a method of using a gantry crane. Background Technology

[0002] In modern shipbuilding, to improve quality and efficiency and shorten dock time, major shipyards generally adopt large-section construction and parallel construction processes, breaking down the hull into multiple independent units for simultaneous fabrication and pre-outfitting. However, with multiple processes running in parallel, the hull sections often need to cross existing structures such as completed side sections and lower decks when being assembled in the dock. This places complex dynamic control requirements on the gantry crane's lifting operations that far exceed those of conventional vertical lifting.

[0003] For special obstacle-crossing loading operations, gantry cranes must perform dynamic, multi-track composite lifting operations: initially, the main section needs to be vertically lifted so that its height completely exceeds the obstacles in the path; then, the position is finely adjusted horizontally according to the preset loading trajectory to avoid surrounding pre-formed structures; finally, it is smoothly and vertically lowered to accurately complete the alignment, joining, and fixing of the main section. The entire process requires flexible and adjustable lifting trajectories and stable and controllable stress states. It is necessary to ensure that large main sections cross obstacles without collision, and to guarantee the accuracy and stability of the final loading. This is a critical process with extremely high difficulty and risk in shipbuilding.

[0004] Throughout the entire process of hoisting large sections of a gantry crane, the stress state of the equipment and the relative position of the components continuously and dynamically change with variations in lifting height, hook spacing, and section posture. Among these changes, the spatial position of the wire ropes is the core factor affecting hoisting safety. During the operation, as the main hook is slowly raised and the section is lifted off the ground, the relative distance and tilt angle between the load-bearing wire rope below the hook and the wire ropes of the fixed hooks symmetrically arranged on both sides of the gantry crane's main beam continuously and dynamically shift.

[0005] When on-site hoisting parameters are unreasonable, such as insufficient spacing between double hooks, excessive overall lifting height, or eccentric stress on components, the angle between the load-bearing wire rope and the vertical direction will continuously decrease. The wire rope will move closer to the main beam of the gantry crane, causing the safety clearance between the wire rope and the lower edge of the beam and the lateral structure to shrink continuously. If not intervened and adjusted in time, this can easily lead to mechanical interference, scraping, and squeezing between the wire rope and the main structure of the gantry crane.

[0006] Such structural interference hazards can lead to multiple safety risks and engineering hazards: On the one hand, repeated friction, compression, and scraping between the wire rope and the steel structure will accelerate the wear, deformation, and breakage of the surface wires of the wire rope, damaging the overall mechanical properties of the wire rope, significantly reducing the safety redundancy of the lifting equipment, and easily causing major safety accidents such as wire rope breakage and hoisting falls in the long run; on the other hand, after the wire rope is constrained by structural interference, it will change the preset stress posture, causing the stress point of the hoisting section to shift and the load distribution to be uneven, breaking the mechanical balance of the hoisting system and causing the hoisting trajectory to deviate from the design path. After the stress imbalance, large ship sections are prone to unstable states such as swaying, deflection, and tilting, and are very likely to have rigid collisions with existing sections, gantry crane structures, and surrounding construction equipment in the dock. This will not only cause quality problems such as hull structure deformation, component damage, and excessive loading accuracy, but also lead to serious consequences such as equipment damage, construction stoppage, and safety accidents. Especially under extreme conditions such as high-level hoisting across obstacles and loading of large-tonnage sections, the wire rope undergoes greater tensile deformation, smaller spatial gaps, and more complex stress states, which significantly increases the probability and severity of structural interference, making it a major safety risk point in shipyard construction.

[0007] Therefore, how to construct a set of gantry crane operation methods that can avoid safety hazards such as wire rope interference, component collision, and hoisting instability, and achieve safe and controllable gantry crane hoisting operations throughout the entire process, has become a technical problem that urgently needs to be solved in the efficient and safe construction of ships. Summary of the Invention

[0008] To achieve the above objectives, the present invention provides the following technical solution: A method of using a gantry crane, the gantry crane including two symmetrically arranged legs, a crossbeam mounted on the top of the two legs, and an upper trolley and a lower trolley that can reciprocate along the extension direction of the crossbeam; the two ends of the crossbeam are respectively fixedly connected to the top of the corresponding legs, and a hollow guide rail extending along its own extension direction is opened in the middle of the crossbeam; the upper trolley and the lower trolley are slidably mounted on the crossbeam; the two ends of the upper trolley are symmetrically mounted with a first hook and a second hook; the bottom of the lower trolley is mounted with a third hook, the third hook being suspended through the hollow guide rail; the method of using the gantry crane includes the following steps: S1, determine the distribution of obstacles on the lifting route of the component to be lifted; if obstacles exist, proceed to step S2; Conversely, the first and second hooks can be used alone to lift the component to be lifted, or the third hook can be used alone, or the upper and lower trolleys can be used together for lifting; S2, determine whether the distance between adjacent lifting rings on the component to be lifted is less than the minimum distance between the first and second hooks: if so, the third hook is used for lifting; otherwise, the first and second hooks are used to simulate lifting the component to be lifted, and it is determined whether the wire ropes of the first and second hooks interfere with the crossbeam during the lifting process of the component to be lifted. If there is a risk of interference, the third hook is used for lifting; otherwise, the first and second hooks are used for joint lifting.

[0009] In some embodiments, the first hook and the second hook are symmetrically distributed on both sides of the crossbeam along the width direction of the crossbeam, and when the first hook and the second hook are at their lowest points in the vertical direction, the distance between the first hook and the second hook is 14 to 17 meters.

[0010] In some embodiments, in step S2, when the minimum distance between the first hook and the second hook is 14 meters, and the distance between adjacent lifting rings on the component to be lifted is less than 14 meters, it is determined that the third hook is selected for lifting.

[0011] In some embodiments, the method of using the gantry crane further includes step S3: based on the determination result of step S2, the upper trolley and / or the lower trolley are selected to carry out the obstacle-crossing lifting and moving operation of the component to be lifted; the hook is connected to all the lifting rings by means of the wire rope and shackles; before the formal lifting operation, a trial lifting inspection procedure is carried out, in which the component to be lifted is lifted 100-200mm off the ground and left suspended for at least 3 minutes.

[0012] In some embodiments, step S1 further includes: if there is no obstacle on the hoisting route of the component to be hoisted, select to use the upper trolley alone for hoisting, or use the lower trolley alone for hoisting, or use the upper trolley and the lower trolley together for hoisting, based on the shape, self-weight, component size, and surface irregular structure distribution of the component to be hoisted.

[0013] In some implementations, the simulated hoisting process is simulated by logical deduction, formula calculation, or computer model calculation to simulate the hoisting process of the first hook and the second hook.

[0014] In some embodiments, before using the third hook to lift the component to be lifted, the number and installation position of the lifting rings are adjusted according to the self-weight and structural mechanical properties of the component to be lifted, the load is checked based on the theoretical bearing capacity of the component to be lifted multiplied by a safety factor, and the positions of the lifting rings are evenly arranged according to the structural force distribution law of the component to be lifted.

[0015] In some embodiments, the number of lifting rings is eight.

[0016] In some embodiments, the upper trolley and the lower trolley are each equipped with an independent drive mechanism, and the two sets of drive mechanisms do not interfere with each other, so that the upper trolley and the lower trolley can operate independently or work in coordination.

[0017] Compared with the prior art, the method of using the gantry crane provided by the present invention has the following beneficial effects: 1. The gantry crane provided by the present invention can flexibly select to use the upper trolley, lower trolley or a combination of both according to the shape, weight, lifting ring spacing and obstacle conditions of the component to be lifted, so as to adapt to a variety of working conditions; 2. This invention uses simulation to determine if the upper trolley's wire rope interferes with the crossbeam when crossing an obstacle, in which case the lower trolley is used instead. The third hook wire rope of the lower trolley is located below the crossbeam, and regardless of the distance between the lifting rings, it will not interfere with the crossbeam, thus ensuring higher safety. 3. For ship components with limited space and small gaps between lifting rings, such as the full-beam bow section, a lower trolley can be used for lifting when it is necessary to cross obstacles, which avoids the problem that the upper trolley cannot cross obstacles normally due to the wire rope being retracted. 4. This invention simulates the hoisting process in advance through logical deduction, formula calculation, or computer modeling, and identifies potential interference in advance, thereby selecting the optimal solution before the actual hoisting. The simulation results can be used for subsequent identical or similar components without the need for repeated actual hoisting verification, greatly improving the efficiency of batch hoisting operations and adapting to the needs of large-scale shipbuilding. Attached Figure Description

[0018] Figure 1 This is a structural schematic diagram of the gantry crane provided by the present invention; Figure 2 This is a schematic diagram of the full-beam bow section of the ship in this invention; Figure 3 This is a schematic diagram of the dynamic simulation starting state of the gantry crane in this invention; Figure 4 This is a schematic diagram showing the state when the hook is at its highest point. Figure 5 This is a schematic diagram showing the installation of the lifting rings; Figure 6 This is a schematic diagram of the connection of the wire rope provided by the present invention.

[0019] Explanation of icon numbers: 1—Gantry crane; 11—Outrigger; 12—Crossbeam; 121—Hollow rail; 13—Upper trolley; 131—First hook; 132—Second hook; 14—Lower trolley; 141—Third hook; 2—Full beam bow section; 21—Lifting ring; 3—Steel wire rope; 4—Shackle. Detailed Implementation

[0020] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the specific implementation methods of the present invention will be described below with reference to the accompanying drawings. Obviously, the drawings described below are merely some embodiments of the present invention. For those skilled in the art, other drawings and other implementation methods can be obtained based on these drawings without any creative effort.

[0021] To keep the drawings concise, each figure only schematically shows the parts relevant to the invention, and these do not represent the actual structure of the product. Furthermore, to facilitate understanding, in some figures, only one of components with the same structure or function is schematically depicted, or only one is labeled. In this document, "one" not only means "only one," but can also mean "more than one."

[0022] It should also be further understood that the term "and / or" as used in this specification and the appended claims refers to any combination of one or more of the associated listed items and all possible combinations, and includes such combinations.

[0023] In this document, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to fixed connections, detachable connections, or integral connections; they can refer to mechanical connections or electrical connections; they can refer to direct connections or indirect connections through an intermediate medium; and they can refer to the internal communication between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0024] Furthermore, in the description of this invention, the terms "first," "second," etc., are used only for distinguishing descriptions and should not be construed as indicating or implying relative importance.

[0025] This invention provides a method for using a gantry crane 1, which is particularly suitable for unobstructed and safe hoisting and transfer operations of large ship components and irregularly shaped sections. It effectively solves the technical problems of interference between the wire rope 3 and the crossbeam 12, poor adaptability to hoisting irregularly shaped components, and high safety risks of obstacle crossing operations in traditional gantry cranes 1 during the hoisting process.

[0026] Combination Figure 1 As shown, the gantry crane 1 used in this invention includes two symmetrically arranged legs 11, a crossbeam 12 mounted on the top of the two legs 11, and an upper trolley 13 and a lower trolley 14 that can reciprocate along the extension direction of the crossbeam 12. The two ends of the crossbeam 12 are fixedly connected to the top of the corresponding legs 11, and a hollow guide rail 121 is provided in the middle of the crossbeam 12, extending along its own extension direction, to provide clearance for the suspension and movement of the hook of the lower trolley 14.

[0027] Both the upper trolley 13 and the lower trolley 14 are slidably mounted on the crossbeam 12 and are equipped with independent drive mechanisms, preferably motor drive structures. The two drive mechanisms do not interfere with each other, so that the upper trolley 13 and the lower trolley 14 can move independently or work together in conjunction, and can flexibly switch between individual operation or joint operation according to hoisting requirements.

[0028] Two hooks, designated as first hook 131 and second hook 132, are symmetrically mounted at the left and right ends of the trolley 13. The first hook 131 and the second hook 132 are symmetrically distributed on both sides of the crossbeam 12 along its width. When the first hook 131 and the second hook 132 are at their lowest points in the vertical direction, the distance between them is 14 to 17 meters.

[0029] The bottom of the lower trolley 14 is equipped with a third hook 141, which is suspended vertically through the hollow guide rail 121 in the middle of the crossbeam 12. Its range of movement is within the crossbeam 12 area between the two support legs 11.

[0030] During hoisting operations, the first hook 131, the second hook 132, and the third hook 141 are all detachably and fixedly connected to the pre-set lifting rings 21 of the ship components to be hoisted via a dedicated wire rope 3 and a shackle 4 structure. The hoisting, lowering, and lateral transfer of the ship components are achieved through the raising and lowering of the wire rope 3 and the translation of the trolley. Based on the above-described gantry crane 1 structure, the method of using the gantry crane 1 provided by this invention specifically includes the following steps: Step S1: Preliminary assessment of working conditions and initial hoisting selection Before the formal hoisting operation, the staff first conducts a comprehensive assessment of the working conditions of the construction site and the components to be hoisted. The assessment includes: the overall shape and structure of the ship components to be hoisted, their self-weight load, component size, and distribution of irregular surface structures. At the same time, the staff also assesses whether there are any obstacles such as side steps, equipment supports, or platform protrusions along the hoisting route.

[0031] If there are no obstacles on the hoisting route, the hoisting mode can be flexibly selected based on the weight, shape, number of lifting rings 21, and spacing between adjacent lifting rings 21 of the component to be hoisted: the double-hook hoisting of the upper trolley 13 can be used alone, or the single-hook hoisting of the lower trolley 14 can be used alone, or the upper and lower trolleys 14 can be used together for hoisting. After selecting the hoisting mode, the component to be hoisted is smoothly lifted to the preset safe height, and then moved laterally along the extension direction of the crossbeam 12 to the designated working position to complete the conventional unobstructed hoisting and transfer operation.

[0032] If there are obstacles on the hoisting route, and there is a risk of interference during the obstacle crossing operation of the component to be hoisted, then proceed to step S2.

[0033] Step S2: Dynamic simulation of the hoisting process S21. Preliminary hoisting selection based on the spacing of the lifting rings 21: Determine whether the distance between adjacent lifting rings 21 on the component to be lifted is less than the minimum distance between the first hook 131 and the second hook 132. Specifically: Measure the distance between adjacent lifting rings 21 on the component to be lifted, and compare the measured distance with the minimum distance of 14 meters between the first hook 131 and the second hook 132 (14 meters is the minimum distance when both the first hook 131 and the second hook 132 are at their lowest points).

[0034] S211. If the distance between adjacent lifting rings 21 of the component to be lifted is less than the minimum distance between the first hook 131 and the second hook 132, the third hook 141 of the lower trolley 14 shall be used to complete the lifting operation. Figure 2 Taking the bow section 2 of a ship as an example of a component to be lifted, this type of component has a compact structure and limited space, with small spacing between the pre-set lifting rings 21, resulting in poor adaptability. Simulation uses a double-hook lifting mechanism on the upper trolley 13. When lifting the component over obstacles, it needs to be raised to a height far exceeding the height of the obstacles. Figure 3During the upward lifting process from the lowest point shown, the two wire ropes 3 corresponding to the first hook 131 and the second hook 132 will continuously converge inward, the angle between the wire ropes 3 and the vertical direction will gradually decrease, and the wire ropes 3 as a whole will shift and converge towards the crossbeam 12. Figure 4 As shown, when the hook is raised to its highest point, the retracted wire rope 3 will interfere with and scrape against the side wall and bottom of the gantry crane's beam 12. This will not only cause wear and deformation of the wire rope 3, reducing the safety factor of the hoisting, but may also lead to component displacement and swaying, causing safety accidents such as component collisions and falls. At the same time, the components need to be repeatedly raised and lowered during the process of crossing obstacles, making the operation process complex and uncontrollable, further exacerbating the safety risks.

[0035] And such Figure 1 As shown, when the third hook 141 of the lower trolley 14 is used for hoisting, the third hook 141 and the matching wire rope 3 always pass through the hollow guide rail 121 of the crossbeam 12 for suspension operation. During the lifting process of the third hook 141 from the lowest point to the highest point, the relative position of the wire rope 3 connected to the third hook 141 and the crossbeam 12 remains unchanged. There will be no situation of it pulling closer to the crossbeam 12, which completely avoids the interference and scraping problems between the wire rope 3 and the crossbeam 12 of the gantry crane 1 and the obstacles on site.

[0036] S213. When the distance between adjacent lifting rings 21 of the component to be lifted is greater than the minimum distance between the first hook 131 and the second hook 132, and the minimum lifting distance requirement of the double hooks of the upper trolley 13 is met, proceed to step S22 to carry out further interference simulation judgment.

[0037] S22. Simulated lifting process and final selection The spacing of the lifting rings 21 of the component to be lifted is adjusted to match 14-17 meters, so that the spacing of the lifting rings 21 is fully adapted to the lifting span requirements of the first hook 131 and the second hook 132. Subsequently, through simulation and mechanical calculation, the entire process of lifting the component across the obstacle is reconstructed, and it is determined whether the wire ropes 3 of the first hook 131 and the second hook 132 interfere with or scrape against the crossbeam 12 during the process of lifting the component to a safe height above the obstacle.

[0038] If the simulation results show that there is a risk of interference, the third hook 141 of the lower trolley 14 will be used for the lifting operation. Specifically, although the spacing of the lifting rings 21 of some components meets the double hook lifting requirements of more than 14 meters, the lifting height required for the components to cross obstacles is large. During the double hook lifting process of the upper trolley 13, the two steel wire ropes 3 will still tilt inward and tighten, eventually contacting and interfering with the crossbeam 12, which cannot meet the safety operation requirements. In this case, the single hook lifting of the lower trolley 14 is the optimal solution.

[0039] If the simulation results show no risk of interference, then the first hook 131 and the second hook 132 of the upper trolley 13 will be used for coordinated lifting operations. This is suitable for operation scenarios where the obstacle height is low and the lifting height of the component across the obstacle is small. The wire ropes 3 of the first hook 131 and the second hook 132 have a small contraction range and will not come into contact with the crossbeam 12. Double hook lifting can improve the uniformity of the force on the component and ensure the stability of the lifting.

[0040] The above-mentioned simulations of the lifting process of the first hook 131, the second hook 132, and the third hook 141 are conducted using logical deduction, formula calculation, or computer model calculation. This allows for the simulation of lifting scenarios involving obstacles before the actual lifting, thus enabling the flexible selection of different lifting methods. After one simulation is completed, for the same or similar components to be lifted, the corresponding lifting method can be directly selected without repeating the actual lifting and obstacle-crossing process.

[0041] S3. Preparatory work for hoisting operations Once the lifting scheme using the third hook 141 of the lower trolley 14 is finally selected, the number and installation position of the lifting rings 21 must be scientifically arranged based on the self-weight and structural mechanical characteristics of the component to be lifted. First, a load check is performed based on the component's theoretical load-bearing capacity, multiplied by a safety factor of 1.25. Figure 5 As shown, it is preferable to arrange 8 lifting rings 21; then, according to the enterprise standard "General Lifting Rings 21 and General Reinforcing Elbow Plate", the type and rated load of the lifting rings 21 are selected. Taking the lifting of the full-width bow section as an example, after load verification and safety calculation, and according to the stress distribution law of the component structure, the positions of the lifting rings 21 are evenly arranged to avoid local stress concentration.

[0042] After the lifting ring 21 is installed, it is connected to the special steel wire rope 3 with the shackle 4, such as Figure 6 As shown, the third hook 141 is securely connected to all the lifting rings 21 on the full-width main section of the bow, ensuring that the connection points fit tightly and are locked in place, and that the force on each lifting point is even, avoiding potential hazards such as loose connection, uneven load, and loosening.

[0043] S4. Formal hoisting operation Based on the above judgment results, the appropriate hoisting mode was finally determined, and formal obstacle-crossing hoisting and moving operations were carried out by using either the upper trolley 13 double hook hoisting or the lower trolley 14 single hook hoisting.

[0044] Regardless of the hoisting method used, a trial hoisting inspection must be performed at the initial stage of lifting the component: the component to be hoisted should be smoothly lifted 100-200mm off the ground and kept suspended for at least 3 minutes. During the suspension period, check the structure, welds, and reinforcing materials of the lifting ring 21 body, the area where the lifting ring 21 connects to the component, and check for any abnormalities such as obvious deformation, cracking, or detachment; check all connection points of the wire rope 3 body, the wire rope 3 to the hook, and the wire rope 3 to the shackle 4 one by one to check for any problems such as wear, loosening, or abnormal noise.

[0045] Taking the single-hook obstacle-crossing hoisting operation of the full-width bow section as an example: After a trial lift confirms there are no safety hazards, the lower trolley 14 drive mechanism is started at a constant speed, gradually raising the third hook 141 to smoothly lift the full-width bow section to a safe height above the side step section of the assembly platform, ensuring that the bottom of the full-width bow section can completely cross the obstacle without collision risk. Then, the lower trolley 14 is driven to move smoothly laterally along the extension direction of the crossbeam 12, smoothly carrying the full-width bow section from one side of the side step section to the dock operation area on the other side. After the full-width bow section is moved horizontally directly above the designated operation area, the third hook 141 is lowered at a constant speed, smoothly placing the full-width bow section into the preset installation position, completing the overall hoisting and transfer operation.

[0046] The above are merely preferred embodiments of the present invention. It should be noted that those skilled in the art can make various improvements and modifications without departing from the principle of the present invention, and these improvements and modifications should also be considered within the scope of protection of the present invention.

Claims

1. A method of using a gantry crane, the gantry crane comprising two symmetrically arranged legs, a crossbeam mounted on the tops of the two legs, and an upper trolley and a lower trolley capable of reciprocating along the extension direction of the crossbeam; the two ends of the crossbeam are respectively fixedly connected to the tops of the corresponding legs, and a hollow guide rail extending along its own extension direction is provided in the middle of the crossbeam; the upper trolley and the lower trolley are slidably mounted on the crossbeam; a first hook and a second hook are symmetrically mounted at both ends of the upper trolley; a third hook is mounted at the bottom of the lower trolley, the third hook being suspended through the hollow guide rail, characterized in that... The method of using the gantry crane includes the following steps: S1. Determine the distribution of obstacles on the hoisting route of the component to be hoisted: If the obstacles exist, proceed to step S2; otherwise, select to use the first hook and the second hook alone to hoist the component to be hoisted, or use the third hook alone to hoist, or use the upper trolley and the lower trolley together for hoisting. S2. Determine whether the distance between adjacent lifting rings on the component to be lifted is less than the minimum distance between the first hook and the second hook: if so, then select the third hook for lifting; Conversely, the first hook and the second hook are used to simulate lifting the component to be lifted. It is determined whether the wire ropes of the first hook and the second hook interfere with the crossbeam during the lifting process of the component to be lifted. If there is a risk of interference, the third hook is used for lifting; otherwise, the first hook and the second hook are used for joint lifting.

2. The method of using the gantry crane according to claim 1, characterized in that, The first hook and the second hook are symmetrically distributed on both sides of the crossbeam along the width direction of the crossbeam, and when the first hook and the second hook are at their lowest points in the vertical direction, the distance between the first hook and the second hook is 14 to 17 meters.

3. The method of using the gantry crane according to claim 2, characterized in that, In step S2, when the minimum distance between the first hook and the second hook is 14 meters, and the distance between adjacent lifting rings on the component to be lifted is less than 14 meters, it is determined that the third hook is selected for lifting.

4. The method of using the gantry crane according to claim 1, characterized in that, It also includes step S3: based on the determination result of step S2, select the upper trolley hoisting and / or the lower trolley to carry out the obstacle-crossing hoisting and moving operation of the component to be hoisted; The hook is connected to all the lifting rings by using the wire rope and shackle. Before the formal lifting operation, a trial lifting inspection procedure is carried out, in which the component to be lifted is lifted 100-200mm off the ground and left suspended for at least 3 minutes.

5. The method of using the gantry crane according to claim 1, characterized in that, Step S1 further includes: if there is no obstacle on the hoisting route of the component to be hoisted, select to use the upper trolley alone for hoisting, or use the lower trolley alone for hoisting, or use the upper trolley and the lower trolley together for hoisting, based on the shape, self-weight, component size, and surface irregular structure distribution of the component to be hoisted.

6. The method of using the gantry crane according to claim 1, characterized in that, The simulated hoisting process is simulated by logical deduction, formula calculation, or computer model calculation to simulate the hoisting process of the first hook and the second hook.

7. The method of using the gantry crane according to claim 1, characterized in that, Before using the third hook to lift the component to be lifted, the number and installation position of the lifting rings are adjusted according to the self-weight and structural mechanical characteristics of the component to be lifted. The load is checked based on the theoretical bearing capacity of the component to be lifted multiplied by the safety factor. The lifting rings are evenly arranged according to the structural force distribution law of the component to be lifted.

8. The method of using the gantry crane according to claim 7, characterized in that, The number of lifting rings is 8.

9. The method of using the gantry crane according to claim 1, characterized in that, The upper trolley and the lower trolley are each equipped with an independent drive mechanism. The two sets of drive mechanisms do not interfere with each other, so that the upper trolley and the lower trolley can operate independently or work in coordination.

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