Gantry crane double-hoisting-beam hoisting method and system

Abstract

The invention provides a double-hoisting-beam hoisting method and system for a gantry crane. The method comprises the steps that the required center distance between an upper trolley and a lower trolley of the gantry crane is obtained according to the required bearing weight; a first lifting beam and a second lifting beam which are symmetrical and meet the bearing requirement are designed and produced according to the required center distance; the two auxiliary hooks of the upper trolley are in butt joint with the lifting lugs on the two sides above the first lifting beam through steel wire ropes correspondingly, the middle lifting lug below the first lifting beam is in butt joint with the two lifting lugs on one side above the second lifting beam through steel wire ropes correspondingly, and the main hook of the lower trolley is in butt joint with the two lifting lugs on the other side above the second lifting beam through steel wire ropes; and a middle lifting lug below the second lifting beam is in butt joint with a lifting lug on the to-be-lifted object through a steel wire rope, so that the to-be-lifted object is lifted. The hoisting capacity of the gantry crane for hoisting small-size and large-weight parts can be improved, and the problems caused by the operation of externally using a truck crane or a crawler crane are avoided.

Description

Technical Field

[0001] The present invention relates to the technical field of freight hoisting, and particularly relates to a gantry crane double-lifting beam hoisting method and system. Background Art

[0002] With the prosperity of the shipping market, there are more and more shipbuilding orders. The designed deadweight tonnage of freight ships is getting larger and larger, the cargo-carrying capacity is getting larger and larger, and the sizes and tonnages of the relatively supporting ship main engines are also getting larger and larger.

[0003] Currently, the existing gantry crane equipment in shipyards, as Figure 2 shown, most designs require that when the distance between the upper and lower trolleys reaches a certain distance, full-load hoisting can be carried out, and there are also requirements for the lifting weights of the upper trolley or the lower trolley. Taking a 300T gantry crane as an example, the lifting capacity of the lower trolley is 150T, the lifting capacity of the upper trolley is 2 * 100T, the side hook distance is 11m, the maximum off-center load of the two hooks is 30T, and the maximum lifting height of the three hooks is 60m. According to Figure 3 the crane load capacity curve shown, when the above gantry crane hoists 260T, the center distance between the upper and lower trolleys needs to reach about 4m, and when meeting the full-load hoisting capacity of 300T of the gantry crane, the center distance between the upper and lower trolleys must be greater than 10m. In addition, when the two trolleys of the gantry crane perform a lifting operation together, the maximum lifting weight of the upper trolley should not exceed 160T.

[0004] Currently, the main engines required for ships, as Figure 4 and 5 shown, the overall machine is 8240mm long, 7420mm wide, and 9910mm high. The center of gravity is located at a height of 4200mm from the bottom, longitudinally at about 18mm to the right of the third to fourth center lines, and transversely at about 127mm to the exhaust side of the diesel engine center line. The total weight of the overall machine assembly, the lifting spreader, and the shipping bracket is about 239T, plus about 4T for the steel wire ropes and shackles required during hoisting, with a total of about 243T to be hoisted. There are a total of 8 lifting lugs on the main engine. During hoisting, the included angle between all the steel wire ropes on the main engine and the vertical direction needs to be less than 5°. The center distance between the bow and stern lifting lugs in the length direction of the main engine is 3500mm, that is, 3.5m, and the center distance between the lifting lugs in the width direction is 730mm, that is, 0.73m. Since the ship's bow and stern direction is perpendicular to the crossbeam of the gantry crane during shipbuilding layout, the lifting lugs for the upper and lower trolleys of the gantry crane are the lifting lugs in the width direction, and the center distance between the lifting lugs in the width direction is 0.73m. According to Figure 3 shown, when the center distance between the lifting lugs of the upper and lower trolleys of the gantry crane is 0.73m, the hoisting weight with the three hooks in line is 240T, which is less than the 243T hoisting capacity required for this main engine. That is, the above 300T gantry crane cannot meet the hoisting of this main engine whether it is the single-hook hoisting of the lower trolley, the double-hook hoisting of the upper trolley, or the hoisting with the three hooks in line.

[0005] For the lifting of the above-mentioned small-sized and large-weight components, the prior art can only hire external truck cranes or crawler cranes to hoist the main engine into the cabin, but there are the following disadvantages:

[0006] (1) The truck crane / crawler crane needs to meet the lifting capacity of 239T and the equipment that meets the requirements of the lifting height and amplitude of the main engine. The crane equipment itself is large, occupies a large area, has high requirements for the space on both sides of the shipbuilding berth, and it is difficult to ensure the space requirements for the truck crane lifting on both sides of the shipbuilding berth;

[0007] (2) During the lifting process of the truck crane / crawler crane, a warning area needs to be set within the range affected by the lifting. Unauthorized personnel are not allowed to enter, and other construction within the affected range needs to be suspended and personnel evacuated, which will affect the shipbuilding progress;

[0008] (3) Hiring external truck cranes / crawler cranes is costly, the construction period is difficult to control, and the construction safety is difficult to guarantee.

[0009] Therefore, for the lifting of the above-mentioned small-sized and large-weight components, the prior art still has problems of many lifting operation limiting factors and high lifting costs. Summary of the Invention

[0010] In order to solve the above problems of the prior art, the present invention provides a double-lifting beam lifting method and system for a gantry crane, which improves the lifting capacity of the gantry crane for lifting small-sized and large-weight components and avoids the problems brought by hiring external truck cranes or crawler cranes for operation.

[0011] In order to achieve the above object, the technical solution adopted by the present invention is as follows:

[0012] In the first aspect, the present invention provides a double-lifting beam lifting method for a gantry crane, including the steps of:

[0013] S1. Obtain the required center distance L0 between the upper trolley and the lower trolley of the gantry crane according to the required load-bearing weight;

[0014] S2. Design and produce a symmetric first lifting beam and a second lifting beam that meet the load-bearing requirements according to the required center distance L0;

[0015] S3. Connect the two auxiliary hooks of the upper trolley to the two side lifting lugs above the first lifting beam respectively through steel wire ropes, connect the middle lifting lug below the first lifting beam to the two lifting lugs on one side above the second lifting beam respectively through steel wire ropes, connect the main hook of the lower trolley to the two lifting lugs on the other side above the second lifting beam respectively through steel wire ropes, and connect the middle lifting lug below the second lifting beam to the lifting lug on the object to be lifted through a steel wire rope to realize the lifting of the object to be lifted, wherein the cross beam of the gantry crane is perpendicular to the first lifting beam in the projection plane and overlaps with the second lifting beam in the projection plane.

[0016] The beneficial effects of the present invention are as follows: For the hoisting of small-sized and large-weight components by a gantry crane, the middle lifting lug of the second lifting beam is docked with the lifting lug of the small-sized and large-weight component to meet the included angle requirement during hoisting. The first lifting beam is docked with the two auxiliary hooks of the upper and lower trolleys to meet the included angle requirement of the auxiliary hooks during hoisting. At this time, the upper side lifting lugs on both sides of the second lifting beam are used to dock with the main hook of the upper trolley and the first lifting beam, so as to have sufficient spacing to meet the required center distance, thereby improving the hoisting capacity of the gantry crane for small-sized and large-weight components and avoiding the problems brought by hiring external truck cranes or crawler cranes for operation.

[0017] Optionally, the step S2 specifically includes the steps:

[0018] According to the required center distance L0, the spacing L G between the two auxiliary hooks of the upper trolley, the maximum included angle α between the wire ropes from the two auxiliary hooks of the upper trolley to the first lifting beam and the vertical line, the maximum included angle β between all the wire ropes on the object to be hoisted and the vertical line, the maximum included angle γ between the wire ropes between the first lifting beam and the second lifting beam, and the maximum lifting height H0 of the gantry crane, the first lifting beam and the second lifting beam that are symmetric and meet the load-bearing requirements are designed and produced.

[0019] Optionally, the first lifting beam and the second lifting beam are designed identically in terms of the lifting lug position and the overall height, and the two lifting lugs in the middle above the first lifting beam and the two lifting lugs in the middle below are respectively on the same vertical line.

[0020] Optionally, the corresponding relational expressions in the step S2 are:

[0021] A < α and tanA = (l G - l2 - 2l3) / 2h1;

[0022] B & C < β;

[0023] tanB = (l2 - l0) / 2h 31 ;

[0024] tanC = l1 / 2h 32 ;

[0025] h3 = max(h 31 , h 32 );

[0026] D < γ and tanD = l3 / 2h2;

[0027] l2 + l3 > L0;

[0028] h1 + h2 + h3 + 2h 梁 + h 物 + h min<H0;

[0029] Wherein, A is the angle between the wire rope from the auxiliary hook of the upper trolley to the first lifting beam and the vertical line, B is the angle between the wire rope from the second lifting beam to the two lifting lugs parallel to the cross beam on the object to be lifted and the vertical line, C is the angle between the wire rope from the second lifting beam to the two lifting lugs perpendicular to the cross beam on the object to be lifted and the vertical line, D is the angle between the wire rope between the first lifting beam and the second lifting beam and the vertical line, l0 and l1 are respectively the distance between the two lifting lugs parallel to the cross beam on the object to be lifted and the distance between the two lifting lugs perpendicular to the cross beam on the object to be lifted, l2 and l3 are respectively the distance between the two middle lifting lugs above the first lifting beam and the distance from the outer lifting lug of the first lifting beam to the adjacent middle lifting lug, h 梁 is the height difference between the upper and lower lifting lugs of the first lifting beam, h 物 is the height of the object to be lifted, h min is the minimum lifting height of the object to be lifted, h1, h2 and h3 are respectively the height differences between the auxiliary hook of the upper trolley and the upper and lower lifting lugs of the first lifting beam, the height from the first lifting beam to the second lifting beam, and the height from the second lifting beam to the main machine.

[0030] Optionally, the maximum angle α and the maximum angle β are the same.

[0031] Optionally, the maximum angle α and the maximum angle β are 5°, and the maximum angle γ is 30°.

[0032] Optionally, the minimum lifting height h min is 2m.

[0033] Optionally, the required load-bearing weight includes the weight of the object to be lifted, the weight of the first lifting beam, the weight of the second lifting beam, and the weight of the lifting assembly, and the lifting assembly includes a wire rope and a shackle.

[0034] Optionally, the object to be lifted is provided with two lifting lugs in the direction parallel to the cross beam and four lifting lugs in the direction perpendicular to the cross beam.

[0035] In a second aspect, the present invention provides a double-lifting-beam hoisting system for a gantry crane, including a gantry crane, a first lifting beam and a second lifting beam. The first lifting beam and the second lifting beam are obtained according to step S2 of the first aspect, and the hoisting relationship among the gantry crane, the first lifting beam, the second lifting beam and the object to be lifted is obtained according to step S3 of the first aspect.

[0036] Wherein, the technical effects corresponding to the double-lifting-beam hoisting system for a gantry crane provided in the second aspect refer to the relevant descriptions of the double-lifting-beam hoisting method for a gantry crane provided in the first aspect. Description of the Drawings

[0037] Figure 1 Schematic flow chart of a lifting method for a double-lifting beam of a gantry crane according to an embodiment of the present invention;

[0038] Figure 2 Schematic structural diagram of a gantry crane according to an embodiment of the present invention;

[0039] Figure 3 Crane load capacity curve graph of the gantry crane according to an embodiment of the present invention;

[0040] Figure 4 Front view of the main machine according to an embodiment of the present invention;

[0041] Figure 5 Side view of the main machine according to an embodiment of the present invention;

[0042] Figure 6 Front view of the first lifting beam according to an embodiment of the present invention;

[0043] Figure 7 Top view of the first lifting beam according to an embodiment of the present invention;

[0044] Figure 8 Front view of the second lifting beam according to an embodiment of the present invention;

[0045] Figure 9 Top view of the second lifting beam according to an embodiment of the present invention;

[0046] Figure 10 Schematic diagram of the cooperation of the upper trolley, lower trolley, first lifting beam, second lifting beam and main machine according to an embodiment of the present invention;

[0047] Figure 11 Schematic diagram of the cooperation between the two auxiliary hooks of the upper trolley and the first lifting beam according to an embodiment of the present invention;

[0048] Figure 12 Schematic diagram of the cooperation between the second lifting beam and the main machine according to an embodiment of the present invention.

[0049] Description of reference numerals:

[0050] 1. Gantry crane;

[0051] 11. Upper trolley; 111. Auxiliary hook;

[0052] 12. Lower trolley; 121. Main hook;

[0053] 2. First lifting beam; 21. First lifting ear; 22. Second lifting ear; 23. Third lifting ear;

[0054] 3. Second lifting beam;

[0055] 4. Steel wire rope;

[0056] 100, Main machine; 101, Fourth lifting lug. Specific implementation mode

[0057] To better understand the above technical solutions, the exemplary embodiments of the present invention will be described in more detail below with reference to the accompanying drawings. Although the exemplary embodiments of the present invention are shown in the drawings, it should be understood that the present invention can be implemented in various forms and should not be limited by the embodiments set forth herein. On the contrary, these embodiments are provided so that the present invention can be understood more clearly and thoroughly, and the scope of the present invention can be completely conveyed to those skilled in the art.

[0058] Embodiment 1

[0059] Please refer to Figures 1 to 11 , A double-lifting beam hoisting method for a gantry crane provided in this embodiment is applied to the scenario of hoisting small-sized and large-weight components. The lifting lugs of such components are relatively close and the weight is large. The traditional hoisting method cannot complete the hoisting while meeting the spacing, angle, and load. And the method of this embodiment is as Figure 1 shown, which includes the steps:

[0060] S1. Obtain the required center distance L0 between the upper trolley 11 and the lower trolley 12 of the gantry crane 1 according to the required load-bearing weight.

[0061] Among them, as Figure 2 shown, the gantry crane 1 of this embodiment includes an upper trolley 11 and a lower trolley 12 on the crossbeam. Among them, the two auxiliary hooks 111 of the upper trolley 11 are vertically arranged front and back relative to the crossbeam.

[0062] Among them, the small-sized and large-weight component of this embodiment is the main machine 100, with a height h 物 of 9.91m. The total weight of the whole machine assembly, the lifting sling, and the shipping bracket is about 239T. Adding about 4T for the steel wire rope 4 and shackles required during hoisting, and the weight of the subsequent first lifting beam 2 and second lifting beam 3 is about 17T, then the required load-bearing weight is 260T. According to Figure 3 shown, the required center distance L0 between the upper trolley 11 and the lower trolley 12 of the gantry crane 1 is 4.0m.

[0063] S2. Design and produce the first lifting beam 2 and the second lifting beam 3 that are symmetrical and meet the load-bearing requirements according to the required center distance L0.

[0064] In this embodiment, step S2 specifically includes the steps:

[0065] According to the required center distance L0 and the spacing L between the two auxiliary hooks 111 of the upper trolley 11 G, design and produce the symmetric first lifting beam 2 and second lifting beam 3 that meet the load-bearing requirements based on the maximum included angle α between the wire ropes 4 from the two auxiliary hooks 111 of the upper trolley 11 to the first lifting beam 2 and the vertical line, the maximum included angle β between all the wire ropes 4 on the object to be lifted and the vertical line, the maximum included angle γ of the wire ropes 4 between the first lifting beam 2 and the second lifting beam 3, and the maximum lifting height H0 of the gantry crane 1.

[0066] Refer to Figures 6 to 9 It can be seen that the first lifting beam 2 and the second lifting beam 3 are identical in design in terms of the position of the lifting lugs and the overall height, and the two second lifting lugs 22 in the middle above the first lifting beam 2 and the two third lifting lugs 23 in the middle below are respectively on the same vertical line. It should be noted that this embodiment mainly considers the setting positions of each hanging lug on the first lifting beam 2 and the second lifting beam 3. Among them, the first lifting beam 2 and the second lifting beam 3 have corresponding transverse diaphragms, webs, top plates, bottom plates, etc. according to the existing design, and there are also reinforcing plates below the second web. Finally, the first lifting beam 2 with a load-bearing capacity of 150T and the second lifting beam 3 with a load-bearing capacity of 300T are obtained. The former weighs about 8T and the latter weighs about 9T. It should be noted that the structural forms of the first lifting beam 2 and the second lifting beam 3 are basically the same, and the main difference in the lifting load-bearing capacity lies in the hanging position. The wire ropes 4 of the first lifting beam 2 are hung at both ends, with a long moment arm, so the load-bearing capacity of the beam body is relatively small; the wire ropes 4 of the second lifting beam 3 are hung at the upper end and the middle of the lifting beam, with a short moment arm, so the load-bearing capacity is relatively large. Combining Figure 7 and Figure 9 's top view, the distribution of the first lifting lug 21, the second lifting lug 22, and the third lifting lug 23 can be obtained.

[0067] Combining Figures 10 to 12 It can be known that the corresponding relational expressions for designing the first lifting beam 2 and the second lifting beam 3 in step S2 are:

[0068] A < α and tanA = (l G - l2 - 2l3) / 2h1;

[0069] B & C < β;

[0070] tanB = (l2 - l0) / 2h 31 ;

[0071] tanC = l1 / 2h 32 ;

[0072] h3 = max(h 31 , h 32 );

[0073] D < γ and tanD = l3 / 2h2;

[0074] l2 + l3 > L0;

[0075] h1 + h2 + h3 + 2h梁 +h 物 +h min <H0;

[0076] Wherein, A is the angle between the wire rope 4 from the auxiliary hook 111 of the upper trolley 11 to the first lifting beam 2 and the vertical line; B is the angle between the wire rope 4 from the second lifting beam 3 to two fourth lifting lugs 101 parallel to the cross beam on the object to be lifted and the vertical line; C is the angle between the wire rope 4 from the second lifting beam 3 to two fourth lifting lugs 101 perpendicular to the cross beam on the object to be lifted and the vertical line; D is the angle between the wire rope 4 between the first lifting beam 2 and the second lifting beam 3 and the vertical line; l0 and l1 are respectively the distance between two fourth lifting lugs 101 parallel to the cross beam on the object to be lifted and the distance between two fourth lifting lugs 101 perpendicular to the cross beam on the object to be lifted; l2 and l3 are respectively the distance between two middle second lifting lugs 22 above the first lifting beam 2 and the distance from the first lifting lug 21 on the outside of the first lifting beam 2 to the adjacent middle second lifting lug 22, h 梁 is the height of the first lifting beam 2, h 物 is the height of the object to be lifted, h min is the lowest lifting height of the object to be lifted; h1, h2 and h3 are respectively the height from the auxiliary hook 111 of the upper trolley 11 to the first lifting beam 2, the height from the first lifting beam 2 to the second lifting beam 3, and the height from the second lifting beam 3 to the main machine 100.

[0077] In this embodiment, the height h of the main machine 100 物 is 9.91m. There are 8 fourth lifting lugs 101 on the main machine 100. During hoisting, the angle between all the wire ropes 4 on the main machine 100 and the vertical line direction should be less than 5°, that is, the maximum angle β is 5°. At this time, the maximum angle α is the same as the maximum angle β, which is also 5°. The center distance between two fourth lifting lugs 101 in the width direction of the main machine 100 is 0.73m, and the center distance between the two fourth lifting lugs 101 at the bow and stern in the length direction of the main machine 100 is 3.5m. However, according to Figure 11 the hoisting schematic diagram, the first and third fourth lifting lugs 101 in the length direction of the main machine 100 are jointly connected to the second lifting beam 3, and the second and fourth fourth lifting lugs 101 are jointly connected to the second lifting beam 3. Therefore, here l1 is the distance between two spaced lifting lugs on the main machine 100, that is, l0 and l1 are 0.73m and 2.65m respectively. In other embodiments, the hanging and hoisting can be carried out according to the distribution of the lifting lugs on the object to be lifted and the corresponding values can be obtained. Among them, the distance L between the two auxiliary hooks 111 of the upper trolley 11 of the gantry crane 1 G is 11m, and the highest lifting height H0 is 60m. Among them, the maximum angle γ is 30°, and the lowest lifting height h min is 2m. Substituting into the above relational formula is:

[0078] tanA = (11 - l2 - 2l3) / 2h1;

[0079] A & B & C < 5°;

[0080] tanB = (l2 - 0.73) / 2h 31 ;

[0081] tanC = 2.65 / 2h 32 ;

[0082] h3 = max(h 31 , h 32 );

[0083] D < 30° and tanD = l3 / 2h2;

[0084] l2 + l3 > 4;

[0085] h1 + h2 + h3 + 2h 梁 + 9.91 + h min < 60;

[0086] The above relational expressions can obtain multiple sets of solutions. An example provided in this embodiment is as follows:

[0087] The actual center distance L1 between the upper trolley 11 and the lower trolley 12 of the gantry crane 1 is 4.84 m. The distance l2 between the two middle second lifting lugs 22 on the upper side of the first lifting beam 2 and the second lifting beam 3 and the distance l3 from the first lifting lug 21 on the outer side of the first lifting beam 2 to the adjacent middle second lifting lug 22 are 1.47 m and 3.42 m respectively. The sum of the two is greater than the actual center distance L1 and also greater than the required center distance L0.

[0088] The height h of the first lifting beam 2 and the second lifting beam 3 梁 is 0.9 m. The height h1 from the auxiliary hook 111 of the upper trolley 11 to the first lifting beam 2, the height h2 from the first lifting beam 2 to the second lifting beam 3, and the height h3 from the second lifting beam 3 to the main machine 100 are 16 m, 6 m, and 17 m respectively. The total height is 52.71 m, which is less than the maximum lifting height H0 of 60 m, and there is still about 8 m of remaining space to meet the lifting requirements.

[0089] At this time, tanA = (11 - 1.47 - 2 * 3.42) / (2 * 16) = 0.084, and A is obtained as 4.79°. tanB = (1.47 - 0.73) / (2 * 17) = 0.022, and B is obtained as 1.26°. tanC = 2.65 / (2 * 17) = 0.078, and C is obtained as 4.44°. tanD = 3.42 / (2 * 6) = 0.143, and D is obtained as 15.91°. The above angles A, B, C, and D all meet the requirements.

[0090] S3. Connect the two auxiliary hooks 111 of the upper trolley 11 to the two lifting lugs on both sides above the first lifting beam 2 respectively through steel wire ropes 4. Connect the middle lifting lug below the first lifting beam 2 to the two lifting lugs on one side above the second lifting beam 3 respectively through steel wire ropes 4. Connect the main hook 121 of the lower trolley 12 to the two lifting lugs on the other side above the second lifting beam 3 respectively through steel wire ropes 4. Connect the middle lifting lug below the second lifting beam 3 to the lifting lug on the object to be lifted through the steel wire rope 4 respectively to realize the lifting of the object to be lifted. Among them, the crossbeam of the gantry crane 1 is perpendicular to the first lifting beam 2 in the projection plane and overlaps with the second lifting beam 3 in the projection plane.

[0091] Among them, the hanging method in step S3 refers to Figures 10 to 12 . Specifically, referring to Figure 11 , it can be seen that the two auxiliary hooks 111 of the upper trolley 11 are respectively and correspondingly connected to the two first lifting lugs 21 on both sides above the first lifting beam 2 through the steel wire ropes 4. Referring to Figure 10 , it can be seen that the middle third lifting lug 23 below the first lifting beam 2 is respectively and correspondingly connected to the two lifting lugs on one side above the second lifting beam 3, that is, the outer first lifting lug 21 to the middle second lifting lug 22, through the steel wire rope 4, and the main hook 121 of the lower trolley 12 is connected to the two lifting lugs on the other side above the second lifting beam 3 through the steel wire rope 4. Combining Figure 10 and Figure 12 , it can be seen that the middle third lifting lug 23 below the second lifting beam 3 is respectively and correspondingly connected to the fourth lifting lug 101 on the object to be lifted through the steel wire rope 4, where Figure 10 are two fourth lifting lugs 101 in the width direction of the main machine 100, Figure 12 are four fourth lifting lugs 101 in the length direction of the main machine 100.

[0092] Finally, the load-bearing situation of the gantry crane 1 hoisting the main machine 100 in this embodiment is described: Since the actual center distance L1 is 4.84 m and the corresponding load-bearing limit is 266 T, which is greater than the required load-bearing weight of 260 T. The load borne by the main hook 121 of the lower trolley 12 = 1 / 2 of the weight of the second lifting beam 3 + 1 / 2 of the weight of the main machine 100 + the weight of the steel wire rope 4 and the shackle = 125.5 T, which is less than the load-bearing limit of 150 T. The two auxiliary hooks 111 of the upper trolley 11 are evenly stressed, and there is no situation where the deviation of the hook exceeds 30 T. The load borne by the two auxiliary hooks 111 = the weight of the first lifting beam 2 + 1 / 2 of the weight of the second lifting beam 3 + 1 / 2 of the weight of the main machine 100 + the weight of the steel wire rope 4 and the shackle = 133.5 T, which is less than the load-bearing limit of 160 T. Among them, the weight of the steel wire rope 4 and the shackle, etc. corresponding to the two lifting beams is 1.5 T respectively. Therefore, the hoisting method in this embodiment meets the hoisting requirements of the main machine 100.

[0093] Therefore, when other objects to be lifted are too heavy and have too small an ear distance to meet the requirements of the design curve of the gantry crane 1, the double-lifting beam lifting method of this embodiment can be used for lifting.

[0094] Embodiment 2

[0095] Please refer to Figures 1 to 12 , the present invention provides a gantry crane double-lifting beam lifting system, including a gantry crane 1, a first lifting beam 2 and a second lifting beam 3. The first lifting beam 2 and the second lifting beam 3 are obtained according to step S2 of Embodiment 1, and referring to Figures 6 to 9 it can be known that the lifting relationship among the gantry crane 1, the first lifting beam 2, the second lifting beam 3 and the object to be lifted can be realized by referring to step S3 of Embodiment 1, and the others also refer to the relevant descriptions of Embodiment 1.

[0096] In summary, it docks the middle lifting ear of the second lifting beam 3 with the lifting ears with a relatively small distance on the small-size and large-weight component, meeting the angle requirements during the lifting of this component. It docks the two side lifting ears on the first lifting beam 2 with the two auxiliary hooks 111 of the lower and upper trolleys 11, meeting the angle requirements of the auxiliary hooks 111 during the lifting. At this time, the two side lifting ears above the second lifting beam 3 are respectively used to dock with the main hook 121 of the upper trolley 11 and the first lifting beam 2, so that it has a sufficient distance to meet the required center distance, thereby improving the lifting capacity of the gantry crane 1 for lifting small-size and large-weight components, avoiding the problems brought by hiring external truck cranes or crawler cranes, and thus being able to perform relatively flexible lifting construction on high-value-added heavy equipment without being restricted by various factors and affecting the lifting operation, reducing the shipbuilding cost.

[0097] In the description of the present invention, it should be understood that the terms "first" and "second" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include one or more of such features. In the description of the present invention, "a plurality" means two or more unless otherwise specifically defined.

[0098] In the present invention, unless otherwise clearly specified and limited, the terms "installation", "connection", "connection", "fixation" and other terms should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or integrated; it can be a mechanical connection, an electrical connection; it can be directly connected, or indirectly connected through an intermediate medium; it can be the internal communication of two components or the interaction relationship between two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0099] In the present invention, unless otherwise clearly specified or limited, a first feature being "on" or "under" a second feature may mean that the first and second features are in direct contact, or the first and second features are indirectly in contact via an intermediate medium. Moreover, a first feature being "above", "over" and "on top of" a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the horizontal height of the first feature is higher than that of the second feature. A first feature being "under", "below" and "beneath" a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the horizontal height of the first feature is lower than that of the second feature.

[0100] In the description of this specification, the descriptions of terms such as "an embodiment", "some embodiments", "embodiments", "examples", "specific examples" or "some examples", etc. refer to that the specific features, structures, materials or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in a suitable manner in any one or more embodiments or examples. In addition, without contradiction, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples.

[0101] Although the embodiments of the present invention have been shown and described above, it can be understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those of ordinary skill in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of the present invention.

Claims

1. A method for hoisting double beams of a gantry crane, characterized in that: Includes steps: S1, obtain the required center distance L0 of the upper and lower trolleys of the gantry crane according to the required load-bearing weight; S2. Design and produce a first hanging beam and a second hanging beam that are symmetrical and meet the load-bearing requirements according to the required center distance L0; S3. Connect the two auxiliary hooks of the upper trolley to the two side ears above the first hanging beam through steel wire ropes, respectively, and connect the middle ear below the first hanging beam to the two ears on one side above the second hanging beam through steel wire ropes, respectively, and connect the main hook of the lower trolley to the two ears on the other side above the second hanging beam through steel wire ropes, and connect the middle ear below the second hanging beam to the ears on the object to be hoisted through steel wire ropes, so as to lift the object to be hoisted, wherein the crossbeam of the gantry crane is perpendicular to the first hanging beam on the projection plane and overlaps with the second hanging beam on the projection plane.

2. A gantry crane double beam hoisting method according to claim 1, characterized in that: The step S2 specifically includes the following steps: According to the requirements, the center distance L0 and the distance between the two auxiliary hooks of the upper trolley L G , the maximum angle α between the steel wire rope between the two auxiliary hooks of the upper trolley and the first lifting beam and the vertical line, the maximum angle β between all the steel wire ropes on the object to be hoisted and the vertical line, the maximum angle γ of the steel wire rope between the first lifting beam and the second lifting beam, and the maximum lifting height H0 of the gantry crane are designed and produced to be symmetrical and meet the load-bearing requirements.

3. A gantry crane double beam hoisting method according to claim 2, characterized in that: The first hanging beam and the second hanging beam are completely designed in terms of the positions of the hanging ears and the overall height, and the two hanging ears in the middle of the upper part and the two hanging ears in the middle of the lower part of the first hanging beam are respectively on the same vertical line.

4. A gantry crane double beam hoisting method according to claim 3, characterized in that: The corresponding relationship in step S2 is: A < α and tan A = (l G -l2 - 2l3) / 2h1; B&C<β; <h2 style=";text-align:left;direction:ltr">tanB = (l2 - l0) / 2h<h2 style=";text-align:left;direction:ltr"> 31 <h2 style=";text-align:left;direction:ltr"> ; <h2 style=";text-align:left;direction:ltr">tanC = l1 / 2h<h2 style=";text-align:left;direction:ltr"> 32 <h2 style=";text-align:left;direction:ltr"> ; h3=max(h 31 ,h 32 ); D<γ and tanD=l3 / 2h2; l2+l3>L0； <h2 style=";text-align:left;direction:ltr">h1+h2+h3+2h<h2 style=";text-align:left;direction:ltr"> 梁 <h2 style=";text-align:left;direction:ltr"> +h<h2 style=";text-align:left;direction:ltr"> 物 <h2 style=";text-align:left;direction:ltr"> +h<h2 style=";text-align:left;direction:ltr"> min <h2 style=";text-align:left;direction:ltr"><H0; Wherein, A is the angle between the steel wire rope between the auxiliary hook of the upper trolley and the first hanging beam and the vertical line, B is the angle between the steel wire rope between the second hanging beam and the two lifting ears on the object to be hoisted and parallel to the crossbeam and the vertical line, C is the angle between the steel wire rope between the second hanging beam and the two lifting ears on the object to be hoisted and perpendicular to the crossbeam and the vertical line, D is the angle between the steel wire rope between the first hanging beam and the second hanging beam and the vertical line, l0 and l1 are respectively the distance between the two lifting ears on the object to be hoisted and parallel to the crossbeam and the distance between the two lifting ears on the object to be hoisted and perpendicular to the crossbeam, l2 and l3 are respectively the distance between the two middle lifting ears above the first hanging beam and the distance from the outer lifting ear of the first hanging beam to the adjacent middle lifting ear, h 梁 is the height difference between the upper and lower lifting ears of the first hanging beam, h 物 is the height of the object to be hoisted, h min is the minimum lifting height of the object to be hoisted, h1, h2 and h3 are respectively the height difference from the upper trolley auxiliary hook to the upper and lower lifting ears of the first lifting beam, the height from the first lifting beam to the second lifting beam, and the height from the second lifting beam to the main machine.

5. A method for hoisting double beams of a gantry crane according to any one of claims 2 to 4, characterized in that: The maximum angle α is the same as the maximum angle β.

6. A method for hoisting double beams of a gantry crane according to any one of claims 2 to 4, characterized in that: The maximum angle α and the maximum angle β are 5°, and the maximum angle γ is 30°.

7. A method for hoisting double beams of a gantry crane according to claim 4, characterized in that: The minimum lifting height h min is 2m.

8. A gantry crane double beam hoisting method according to claim 1, characterized in that: The required load-bearing weight includes the weight of the object to be hoisted, the weight of the first hoisting beam, the weight of the second hoisting beam, and the weight of a hoisting assembly, wherein the hoisting assembly includes a wire rope and a shackle.

9. A gantry crane double beam hoisting method according to claim 1, characterized in that: The object to be hoisted has two lifting ears distributed in a direction parallel to the crossbeam and four lifting ears distributed in a direction perpendicular to the crossbeam.

10. A gantry crane double beam hoisting system, characterized in that: It includes a gantry crane, a first lifting beam and a second lifting beam, the first lifting beam and the second lifting beam are obtained according to step S2 of claim 1, and the lifting relationship between the gantry crane, the first lifting beam, the second lifting beam and the object to be lifted is obtained according to step S3 of claim 1.

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