Middle beam forming method, middle beam and middle beam forming auxiliary device

Abstract

The invention discloses a center sill forming method, a center sill and a center sill forming auxiliary device. The center sill forming method comprises the steps that a first preformed structure is deformed into a first arc shape, an opening of the first preformed structure faces upwards, then a first cushion block is arranged on the top of a bottom plate of the first preformed structure, and a second preformed structure is stacked on the first cushion block; the second pre-forming structure is deformed into a second arc shape, and the arc opening of the first pre-forming structure is opposite to the arc opening of the second pre-forming structure; the relative positions of the first pre-forming structure and the second pre-forming structure are fixed through the first positioning plate and the second positioning plate to form an assembly structure; and performing seam welding on all welding seams on the periphery of the assembly structure. The assembling structure is always kept in a constant deformation state in the process of seam welding of all the welding seams, the problems that deformation is complex and the deformation amount is large after the middle beam is welded and formed can be effectively solved, flame correction does not need to be conducted on the formed middle beam, and therefore the quality and efficiency of the formed middle beam can be effectively improved.

Description

Technical Field

[0001] The present invention relates to the technical field of center sill forming, in particular to a center sill forming method, a center sill and a center sill forming auxiliary device. Background Art

[0002] The main load-bearing components of the underframe of a diesel locomotive are two center sills. Therefore, the quality of the center sill after assembly welding is crucial for the load-bearing performance of the underframe of the diesel locomotive. At present, most of the existing center sills in China are of box girder structure, that is, along the length direction of the center sill, the cross-sectional shape of the center sill is rectangular. Specifically, the center sill is formed by assembling and welding a bottom plate, two webs, a cover plate and several stiffening plates to form a box girder structure.

[0003] When assembling and welding the center sill in the prior art, usually two webs are directly assembled and welded onto the bottom plate first, and then the cover plate is directly assembled and welded onto the tops of the two webs. For the case where the thickness and shape of the two webs are the same, although the deformation amount of the center sill is relatively small, the center sill still needs to be flame straightened later; for the case where the thickness and / or shape of the two webs are different, the deformation of the center sill is complex and the deformation amount is large. The center sill must be flame straightened later, and the difficulty of flame straightening is large, the time is long, and it is easy to reduce the structural strength of the center sill; secondly, the efficiency of this assembly welding forming method is low. Summary of the Invention

[0004] The purpose of the present invention is to provide a center sill forming method, a center sill and a center sill forming auxiliary device to solve the above problems existing in the prior art.

[0005] To achieve this purpose, the present invention adopts the following technical solutions:

[0006] A center sill forming method for synchronously assembling and welding two center sills; including:

[0007] Sewing and welding the inner sides close to each other on the first web and the second web of each center sill to the corresponding bottom plate, and spot welding and positioning the cover plate of each center sill on the corresponding first web and second web. After forming the first preformed structure and the second preformed structure:

[0008] Moving the first preformed structure to a preset synchronous welding position, and making the bottom plate of the first preformed structure located directly above the first web and the second web;

[0009] Applying a first acting force to the first preformed structure to deform the first preformed structure into a first arc shape, the center of the first arc shape is far from the first web and the second web relative to the bottom plate of the first preformed structure, and the chord height of the first arc shape is a first preset chord height; the first preset chord height is less than the limit upward deflection chord height;

[0010] Set the first cushion block above the top of the bottom plate of the first preformed structure;

[0011] Move the second preformed structure to the preset synchronous group welding position, and stack the bottom plate of the second preformed structure on top of the first cushion block;

[0012] Apply a second force to the second preformed structure to deform the second preformed structure into the first arc shape, and the arc openings of the first preformed structure and the second preformed structure are opposite to each other;

[0013] Along the spacing direction of the first web and the second web, spot weld the first process positioning plate on the first side of the bottom plate of the first preformed structure and the bottom plate of the second preformed structure, and spot weld the second process positioning plate on the second side of the bottom plate of the first preformed structure and the bottom plate of the second preformed structure to fix the relative positions of the first preformed structure, the second preformed structure and the first cushion block to form an assembled structure;

[0014] Remove the first force and the second force;

[0015] Seam weld each weld on the outer periphery of the first preformed structure, and seam weld each weld on the outer periphery of the second preformed structure.

[0016] As a preferred solution of the above middle beam forming method, after seam welding each weld on the outer periphery of the first preformed structure and seam welding each weld on the outer periphery of the second preformed structure, the following steps are further included:

[0017] After the assembled structure is allowed to cool, detach the first process positioning plate, the second process positioning plate and the first cushion block.

[0018] As a preferred solution of the above middle beam forming method, before seam welding the inner sides close to each other on the first web and the second web of each middle beam to the corresponding bottom plate, the following steps are further included:

[0019] Rotate the basic structure so that the bottom plate of the basic structure is located directly below the corresponding first web and second web; wherein, the basic structure is formed by spot welding the first web and the second web of the middle beam to the bottom plate.

[0020] Apply a third force to the basic structure to deform the basic structure into a second arc shape, the center of the second arc shape is far from the first web and the second web relative to the bottom plate of the basic structure, and the chord height of the second arc shape is a second preset chord height; the second preset chord height is greater than the first preset chord height and less than the limit upward deflection chord height.

[0021] After spot - welding the cover plates of each of the said center beams to the corresponding first web and second web respectively:

[0022] Remove the said third acting force to form the said first pre - formed structure and the said second pre - formed structure.

[0023] As a preferred embodiment of the above - mentioned center beam forming method, before rotating the basic structure so that the bottom plate of the basic structure is directly below the corresponding first web and second web, the following steps are further included:

[0024] Rotate the basic structure so that the first web is directly below the second web;

[0025] Apply a fourth acting force to the basic structure to deform the basic structure into a third arc shape. The center of the third arc shape is farther from the first web relative to the second web, and the chord height of the third arc shape is a third preset chord height; the third preset chord height is less than the limit side deflection chord height.

[0026] As a preferred embodiment of the above - mentioned center beam forming method, the center beam further includes rib plates; after the basic structure is deformed into a third arc shape, the following steps are further included:

[0027] Sew - weld a plurality of the said rib plates to the inner side of the first web so that the plurality of the said rib plates are distributed at intervals along the arc extension direction of the first web;

[0028] Remove the said fourth acting force;

[0029] Rotate the basic structure so that the second web is directly below the first web;

[0030] Apply a fifth acting force to the basic structure to deform the basic structure into the said third arc shape;

[0031] Sew - weld a plurality of the said rib plates to the inner side of the second web;

[0032] Remove the said fifth acting force.

[0033] As a preferred embodiment of the above - mentioned center beam forming method, the specific steps of spot - welding the cover plate of the center beam to the first web and the second web include:

[0034] Set the cover plate to include at least two sub - cover plate parts;

[0035] Position the relative positions of the first web, the second web, and at least two of the sub-cover plate portions such that at least two of the sub-cover plate portions are arranged in sequence along the arc extension direction of the first web and the second web, and such that, in a direction perpendicular to the first web and the second web, the first ends of the end faces of any two adjacent sub-cover plate portions that are close to each other contact the second web at a first position;

[0036] Spot-weld all of the at least two positioned sub-cover plate portions to the first web and the second web;

[0037] Wherein, when the number of the sub-cover plate portions is two, the first position is at the middle position in the arc extension direction of the second web; when the number of the sub-cover plate portions is greater than or equal to, each of the first positions is spaced apart along the arc extension direction of the second web.

[0038] As a preferred embodiment of the above-described central beam forming method, the specific steps of seam-welding each weld seam on the outer periphery of the first preformed structure and seam-welding each weld seam on the outer periphery of the second preformed structure include:

[0039] Rotate the assembled structure such that each weld seam on the outer periphery of the first preformed structure and each weld seam on the outer periphery of the second preformed structure are sequentially oriented towards the top of the assembled structure, and seam-weld the weld seams oriented towards the top of the assembled structure.

[0040] As a preferred embodiment of the above-described central beam forming method, the central beam forming auxiliary device includes two first positioners. The first positioner includes at least two rotating portions, and the at least two rotating portions have a first working state and a second working state; when the at least two rotating portions are in the first working state, the outer peripheries of the at least two rotating portions are formed into a rotating ring, and the inner peripheries of the at least two rotating portions are formed into a synchronizing group welding positioning space that is axially through, and the rotating ring can rotate around its own central axis; when the at least two rotating portions are in the second working state, the synchronizing group welding positioning space is opened, and the central beam can enter and exit the synchronizing group welding positioning space and can be supported within the synchronizing group welding positioning space;

[0041] The specific steps of moving the first preformed structure to a preset synchronizing group welding position include:

[0042] Lift and install the first preformed structure to the two first positioners such that the two ends of the arc extension direction of the first preformed structure are respectively supported within the synchronizing group welding positioning spaces of the two first positioners to reach the preset synchronizing group welding position;

[0043] Rotate the assembled structure so that each weld on the outer periphery of the first preformed structure and each weld on the outer periphery of the second preformed structure sequentially face the top of the assembled structure. The specific steps of seam welding the welds facing the top of the assembled structure include:

[0044] When the rotating parts of the two first positioners are both in the first working state, drive each rotating part of the first positioner to rotate around its own central axis, so that each weld on the outer periphery of the first preformed structure and each weld on the outer periphery of the second preformed structure sequentially face the top of the assembled structure, and seam weld the welds facing the top of the assembled structure.

[0045] The middle beam includes a bottom plate, a first web, a second web and a cover plate. The bottom plate, the first web, the second web and the cover plate are formed into a middle beam by using the above-mentioned middle beam forming method.

[0046] As a preferred solution of the above middle beam, the first web is a flat web, the second web is an L-shaped web, and the plate thickness of the first web is greater than the plate thickness of the second web.

[0047] The middle beam forming auxiliary device is used to implement the above-mentioned middle beam forming method. The middle beam forming auxiliary device includes:

[0048] The spacer block includes a first spacer block for clamping between the bottom plates of the two middle beams;

[0049] The first process positioning plate and the second process positioning plate are used to fix the relative positions of the bottom plates of the two middle beams;

[0050] The welding unit is used to spot-weld the first web and the second web of each middle beam to the corresponding bottom plate, spot-weld the cover plate of each middle beam to the corresponding first web and second web, spot-weld the first process positioning plate to the bottom plates of the two middle beams, spot-weld the second process positioning plate to the bottom plates of the two middle beams, seam-weld each weld on the outer periphery of the first preformed structure, and seam-weld each weld on the outer periphery of the second preformed structure;

[0051] Two first force application units are used to apply forces to the first preformed structure and the second preformed structure.

[0052] As a preferred solution of the above middle beam forming auxiliary device, the middle beam forming auxiliary device further includes two first positioners; the first positioner includes:

[0053] At least two rotating parts, at least two of the rotating parts having a first working state and a second working state; when at least two of the rotating parts are in the first working state, the outer peripheries of at least two of the rotating parts are configured as a rotating ring, and the inner peripheries of at least two of the rotating parts are configured as an axially penetrating synchronous group welding positioning space, and the rotating ring can rotate around its own central axis; when at least two of the rotating parts are in the second working state, the synchronous group welding positioning space is opened, and the middle beam can enter and exit the synchronous group welding positioning space and can be supported within the synchronous group welding positioning space.

[0054] Advantages of the present invention:

[0055] The present invention provides a middle beam forming method, a middle beam and a middle beam forming auxiliary device. Among them, the middle beam forming method is used for synchronously group welding to form two middle beams; in the middle beam forming method, the inner sides close to each other on the first web and the second web of each middle beam are seam welded to the corresponding bottom plate, and the cover plate of each middle beam is spot welded to the corresponding first web and second web. After forming the first preformed structure and the second preformed structure: move the first preformed structure to a preset synchronous group welding position, and make the bottom plate of the first preformed structure located directly above the first web and the second web; apply a first acting force to the first preformed structure to deform the first preformed structure into a first arc shape, the center of the first arc shape is far from the first web and the second web relative to the bottom plate of the first preformed structure, and the chord height of the first arc shape is a first preset chord height; the first preset chord height is less than the limit upward deflection chord height; arrange the first cushion block above the top of the bottom plate of the first preformed structure; move the second preformed structure to the preset synchronous group welding position, and make the bottom plate of the second preformed structure stacked on the top of the first cushion block; apply a second acting force to the second preformed structure to deform the second preformed structure into a first arc shape, and the arc openings of the first preformed structure and the second preformed structure are opposite; along the interval direction of the first web and the second web, spot weld the first process positioning plate to the first side of the bottom plate of the first preformed structure and the bottom plate of the second preformed structure, and spot weld the second process positioning plate to the second side of the bottom plate of the first preformed structure and the bottom plate of the second preformed structure to fix the relative positions of the first preformed structure, the second preformed structure and the first cushion block to form an assembled structure; remove the first acting force and the second acting force; seam weld each weld on the outer periphery of the first preformed structure and seam weld each weld on the outer periphery of the second preformed structure.

[0056] By synchronously forming two middle beams through the middle beam forming method, during the process of seam welding each weld on the outer peripheries of the first preformed structure and the second preformed structure, the assembled structure always maintains a constant deformation state, which can effectively avoid the problems of complex deformation and large deformation amount after the middle beam is welded and formed, and there is no need to perform flame straightening on the formed middle beam, thereby effectively improving the quality and efficiency of the formed middle beam. Description of the Drawings

[0057] Figure 1 is a longitudinal cross-section of the center beam provided by a specific embodiment of the present invention; Figure 1 ;

[0058] Figure 2 is a longitudinal cross-section of the center beam provided by a specific embodiment of the present invention; Figure 2 ;

[0059] Figure 3 is an assembly drawing of the first positioner and the assembly structure provided by a specific embodiment of the present invention;

[0060] Figure 4 is an assembly drawing of the first force application unit and the first preformed structure provided by a specific embodiment of the present invention;

[0061] Figure 5 is an assembly drawing of the base structure and two second positioners provided by a specific embodiment of the present invention;

[0062] Figure 6 is a schematic structural diagram of the bracket of the second positioner provided by a specific embodiment of the present invention;

[0063] Figure 7 is a partial structural schematic diagram of the second positioner provided by a specific embodiment of the present invention;

[0064] Figure 8 is an assembly drawing of the base structure and the second positioner from the first perspective provided by a specific embodiment of the present invention;

[0065] Figure 9 is an assembly drawing of the base structure and the second positioner from the second perspective provided by a specific embodiment of the present invention;

[0066] Figure 10 is an assembly drawing of the overall structure composed of the rib plate and the base structure supported by two second cushion blocks provided by a specific embodiment of the present invention;

[0067] Figure 11 is an assembly drawing of the overall structure composed of the rib plate and the base structure supported by a third cushion block provided by a specific embodiment of the present invention;

[0068] Figure 12 is an assembly drawing of the overall structure composed of the rib plate and the base structure supported by a fourth cushion block provided by a specific embodiment of the present invention;

[0069] Figure 13 is a schematic structural diagram of two sub-cover plate parts spot-welded and positioned on the overall structure composed of the rib plate and the base structure provided by a specific embodiment of the present invention;

[0070] Figure 14 Schematic diagram of the structure where the first preformed structure, the second preformed structure, and the first spacer block provided by a specific embodiment of the present invention are assembled on two first positioners;

[0071] Figure 15 Cross-sectional view of the assembled structure composed of the first preformed structure, the second preformed structure, the first spacer block, the first process positioning plate, and the second process positioning plate provided by a specific embodiment of the present invention;

[0072] Figure 16 Cross-sectional view of the assembled structure when the weld formed by the first web of the second preformed structure and at least two sub-cover plate parts provided by a specific embodiment of the present invention faces the top of the assembled structure;

[0073] Figure 17 Flow chart of the center beam forming method provided by a specific embodiment of the present invention Figure 1 ;

[0074] Figure 18 Flow chart of the center beam forming method provided by a specific embodiment of the present invention Figure 2 ;

[0075] Figure 19 Flow chart of the center beam forming method provided by a specific embodiment of the present invention Figure 3 。

[0076] In the figure:

[0077] 1. Center beam; 11. Bottom plate; 12. First web; 13. Second web; 14. Cover plate; 141. Sub-cover plate part; 142. At the first position; 143. Fitting gap; 15. Rib plate; 151. First sub-rib plate; 152. Second sub-rib plate;

[0078] 21. First spacer block; 22. Second spacer block; 23. Third spacer block; 24. Fourth spacer block;

[0079] 31. First process positioning plate; 32. Second process positioning plate;

[0080] 4. First positioner; 41. Rotating part; 411. Synchronous group welding positioning space; 42. Bracket; 421. Roller; 43. Driving wheel; 44. Auxiliary wheel; 45. First limiting unit; 451. First limiting block; 452. First lead screw; 46. Second limiting unit; 461. Second limiting block; 462. Second lead screw; 47. Third limiting unit; 471. Third limiting block; 472. Third lead screw;

[0081] 5. First force application unit; 51. Hand chain hoist; 511. Hook; 512. Chain; 52. Link ring;

[0082] 6. First slide rail;

[0083] 8. Base

[0084] 9. Second positioner; 91. Bracket; 911. Avoidance space; 92. Fourth limit unit; 921. Fourth limit block; 922. Fourth lead screw; 93. Fifth limit unit; 931. Fifth limit block; 932. Fifth lead screw; 94. Sixth limit unit; 941. Sixth limit block; 942. Sixth lead screw; 943. Sliding arm; 944. Locking member; 95. First mounting seat; 96. Second mounting seat Detailed implementation mode

[0085] The present invention will be further described in detail below with reference to the accompanying drawings and embodiments. It can be understood that the specific embodiments described herein are only used to explain the present invention, rather than limiting the present invention. In addition, it should be noted that for the convenience of description, only parts related to the present invention are shown in the drawings, rather than all structures

[0086] In the description of the present invention, unless otherwise clearly defined and limited, the terms "connected", "connected", and "fixed" 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 or an electrical connection; it can be directly connected, or indirectly connected through an intermediate medium, and it can be the internal connection 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 situations

[0087] In the present invention, unless otherwise clearly defined and limited, the first feature being "above" or "below" the second feature may include direct contact between the first and second features, or may include the situation where the first and second features are not in direct contact but in contact through other features between them. Moreover, the first feature being "above", "above", and "on" the second feature includes the first feature being directly above and obliquely above the second feature, or simply indicating that the first feature is at a higher horizontal height than the second feature. The first feature being "below", "below", and "under" the second feature includes the first feature being directly below and obliquely below the second feature, or simply indicating that the first feature is at a lower horizontal height than the second feature

[0088] In the description of this embodiment, the orientation or positional relationships such as "above", "below", "right", etc. are based on the orientation or positional relationships shown in the drawings, and are only for the convenience of description and simplifying the operation, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus cannot be understood as a limitation to the present invention. In addition, the terms "first" and "second" are only used for distinction in description and do not have special meanings

[0089] Embodiment 1

[0090] As Figure 1 and Figure 2 shown, this embodiment provides a center sill 1, which includes a bottom plate 11, a first web 12, a second web 13, and a cover plate 14. The bottom plate 11, the first web 12, the second web 13, and the cover plate 14 are welded together to form the center sill 1. Specifically, the cross-sectional shape of the center sill 1 along the length direction is approximately rectangular, such that the formed center sill 1 is a box girder structure.

[0091] Specifically, the shapes and thicknesses of the first web 12 and the second web 13 can be adaptively set according to actual working conditions. That is, the first web 12 and the second web 13 can have different shapes and different thicknesses, or different shapes but the same thickness, or the same shape but different thicknesses, or the same shape and the same thickness.

[0092] In this embodiment, as Figure 1 and Figure 2 shown, exemplarily, the first web 12 is a flat web, the second web 13 is an L-shaped web, and the thickness of the first web 12 is greater than that of the second web 13. The center sill 1 formed by using the flat web and the L-shaped web is particularly suitable for new energy locomotives.

[0093] Optionally, as Figure 1 and Figure 2 shown, the center sill 1 further includes a rib plate 15, which is located in the installation space formed by enclosing the bottom plate 11, the first web 12, the second web 13, and the cover plate 14, and the bottom plate 11, the first web 12, and the second web 13 are all seam-welded to the rib plate 15. With such a setting, the structural strength and service life of the formed center sill 1 can be improved.

[0094] Embodiment Two

[0095] This embodiment provides an auxiliary device for forming the center sill, which is used to assist in synchronously group-welding and forming two center sills 1. That is, it assists in assembling and forming the bottom plate 11, the first web 12, the second web 13, the cover plate 14, and the rib plate 15 of each center sill 1, or assists in group-welding and forming the bottom plate 11, the first web 12, the second web 13, and the cover plate 14 of each center sill 1.

[0096] In this embodiment, as Figures 1 - 3 shown, exemplarily, taking the auxiliary device for forming the center sill to assist in synchronously group-welding and forming two center sills 1, and each center sill 1 includes a bottom plate 11, a first web 12, a second web 13, a cover plate 14, and a rib plate 15 as an example; among them, the first web 12 is a flat web, the second web 13 is an L-shaped web, and the thickness of the first web 12 is greater than that of the second web 13.

[0097] It can be understood that the auxiliary device for forming the middle beam can also be used to assist in synchronously forming two middle beams 1 of other structural types by group welding. Specifically, the middle beams 1 of other types can be: the middle beam 1 with the same plate thickness but different shapes of the first web 12 and the second web 13, the middle beam 1 with the same shape but different plate thicknesses of the first web 12 and the second web 13, or the middle beam 1 with the same shape and the same plate thickness of the first web 12 and the second web 13, etc.

[0098] Among them, as Figure 15 shown, the auxiliary device for forming the middle beam includes a cushion block, a first process positioning plate 31, a second process positioning plate 32, a welding unit, two preformed structure auxiliary forming devices, and an assembly forming device.

[0099] Among them, in this embodiment, the cushion block includes at least one first cushion block 21, two second cushion blocks 22, a third cushion block 23, and a fourth cushion block 24.

[0100] As Figure 14 shown, at least one first cushion block 21 is used to be clamped between the bottom plate 11 of the first preformed structure and the bottom plate 11 of the second preformed structure. It is convenient to perform upward deflection on the second preformed structure subsequently. Among them, the first preformed structure is: on the first web 12 and the second web 13 of one of the middle beams 1, the inner sides close to each other are both seam-welded to the corresponding bottom plate 11, and the cover plate 14 is spot-welded to the corresponding first web 12 and the second web 13 to form a structure. The second preformed structure is: on the first web 12 and the second web 13 of the other middle beam 1, the inner sides close to each other are both seam-welded to the corresponding bottom plate 11, and the cover plate 14 is spot-welded to the corresponding first web 12 and the second web 13 to form a structure.

[0101] As Figures 10 - 12 shown, two second cushion blocks 22, a third cushion block 23, and a fourth cushion block 24 can all be detachably connected to the tabletop of the base 8. The detachable connection method is set so that the setting position of the cushion block on the base 8, the number of cushion blocks, and the specification of the cushion block can be adjusted adaptively according to the actual working conditions requirements. Thus, during the subsequent process of assisting in assembling two middle beams 1, it is convenient to perform side deflection and upward deflection on the basic structure formed by spot-welding and positioning the bottom plate 11, the first web 12, and the second web 13. Specifically, the detachable connection methods include but are not limited to plug connection, snap connection, bolt and nut mating connection, or screw connection, etc.

[0102] Specifically, the deflection refers to: the amount of bending deformation of an object after being stressed.

[0103] Upward deflection of the first preformed structure means: setting the bottom plate 11 of the first preformed structure directly above the first web 12 and the second web 13; applying a force to the first preformed structure to deform the first preformed structure into a first arc shape, and the center of the first arc shape is away from the first web 12 and the second web 13 relative to the bottom plate 11.

[0104] Upward deflection of the second preformed structure means: setting the bottom plate 11 of the second preformed structure directly below the first web 12 and the second web 13; applying a force to the second preformed structure to deform the second preformed structure into a first arc shape, and the center of the first arc shape is away from the first web 12 and the second web 13 relative to the bottom plate 11.

[0105] Upward deflection of the base structure means: setting the bottom plate 11 of the base structure directly below the first web 12 and the second web 13; applying a force to the base structure to deform the base structure into a second arc shape, and the center of the second arc shape is away from the first web 12 and the second web 13 relative to the bottom plate 11.

[0106] In this embodiment, the chord height corresponding to the first arc shape is different from the chord height corresponding to the second arc shape.

[0107] Lateral deflection of the base structure means: setting one of the first web 12 and the second web 13 of the base structure directly below the other; applying a force to the base structure to deform the base structure into a third arc shape, and the center of the third arc shape is away from the one of the first web 12 and the second web 13 located below relative to the one of the first web 12 and the second web 13 located above.

[0108] Among them, as Figure 15 shown, the first process positioning plate 31 is used for spot welding and positioning on the first side of the bottom plate 11 of the first preformed structure and the bottom plate 11 of the second preformed structure; the second process positioning plate 32 is used for spot welding and positioning on the second side of the bottom plate 11 of the first preformed structure and the bottom plate 11 of the second preformed structure. In other words, the first process positioning plate 31 and the second process positioning plate 32 are used to fix the relative positions of the first preformed structure, the second preformed structure and the first spacer 21, so that the first preformed structure, the second preformed structure and the first spacer 21 form an assembled structure, which is convenient for subsequent seam welding of each weld on the outer periphery of the first preformed structure and convenient for subsequent seam welding of each weld on the outer periphery of the second preformed structure.

[0109] Among them, the welding unit is used to weld two workpieces to be welded. The two workpieces to be welded are the bottom plate 11 and the first web 12, the bottom plate 11 and the second web 13, the bottom plate 11 and the rib plate 15, the first web 12 and the rib plate 15, the second web 13 and the rib plate 15, the first web 12 and the cover plate 14, or the second web 13 and the cover plate 14. Specifically, the welding unit can spot-weld the first web 12 and the second web 13 of each girder 1 to the corresponding bottom plate 11 respectively, spot-weld the cover plate 14 of each girder 1 to the corresponding first web 12 and second web 13 respectively, spot-weld the first process positioning plate 31 to the bottom plates 11 of two girders 1, spot-weld the second process positioning plate 32 to the bottom plates 11 of two girders 1, seam-weld each weld seam on the outer periphery of the first preformed structure, and seam-weld each weld seam on the outer periphery of the second preformed structure, seam-weld the inner side of the first web 12 of each girder 1 close to the second web 13 to the bottom plate 11, seam-weld the inner side of the second web 13 of each girder 1 close to the first web 12 to the bottom plate 11, and seam-weld the rib plate 15 of each girder 1 to the bottom plate 11, the first web 12 and the second web 13.

[0110] Specifically, the welding unit includes a first translation mechanism, a first lifting mechanism and a welding head. The first lifting mechanism is arranged at the output end of the first translation mechanism, and the welding head is arranged at the output end of the first lifting mechanism. The first translation mechanism can drive the second lifting mechanism and the welding head to translate synchronously, and the first lifting mechanism can drive the welding head to lift, so as to realize welding of two workpieces to be welded. The first translation mechanism and the first lifting mechanism can also be replaced by a first multi-axis robotic arm. By driving the welding head to lift and translate with the first multi-axis robotic arm, welding of two workpieces to be welded can also be realized. Among them, the specific structures of the first lifting mechanism, the first translation mechanism, the welding head and the first multi-axis robotic arm all belong to the prior art, so they will not be elaborated here.

[0111] It can be understood that the welding unit is adaptively increased according to the actual working conditions.

[0112] Among them, as Figure 3 and 4 shown, the assembly and forming device includes a first slide rail group, a second slide rail group, two first force application units 5 and two first positioners 4.

[0113] Specifically, the first force application unit 5 is used to apply a force to the first preformed structure and the second preformed structure, so that the first preformed structure can be deflected upward, and the second preformed structure can be deflected upward.

[0114] Specifically, as Figure 4As shown, the first force application unit 5 includes two chain hoists 51 and two sets of connecting rings 52. The first slide rail group includes at least two first slide rails 6; the two chain hoists 51 and the two sets of connecting rings 52 are arranged in one-to-one correspondence; the two connecting rings 52 of each set of connecting rings 52 are slidably connected to two of the first slide rails 6 in one-to-one correspondence along the extension direction of the first slide rail 6; the two hooks 511 of each chain hoist 51 can be hooked to the corresponding two connecting rings 52 in one-to-one correspondence. The first orientation is perpendicular to the extension direction of the first slide rail 6. The two first force application units 5 are distributed at intervals along the extension direction of the first slide rail 6. The specific structure of the chain hoist 51 belongs to the prior art and will not be described in detail here.

[0115] When applying a force to the first preformed structure to cause the first preformed structure to deflect upward: as Figure 4 shown, adjust the bottom plate 11 of the first preformed structure to be directly above the first web 12 and the second web 13, and hoist the first preformed structure so that the two ends of the first preformed structure in the arc extension direction are supported on the output ends of the two first positioners 4 in one-to-one correspondence; after the two ends of the bottom plate 11 of the first preformed structure in the arc extension direction are supported on the output ends of the two first positioners 4 in one-to-one correspondence, use one of the two first force application units 5 to pass one hook 511 of the chain hoist 51 around the top of the first preformed structure, so that the chain 512 of the chain hoist 51 passes around the top of the first preformed structure; hook the two hooks 511 of the chain hoist 51 to the corresponding two connecting rings 52 in one-to-one correspondence; move the chain hoist 51 to the middle area in the arc extension direction of the first preformed structure, tighten the chain 512, and the chain 512 applies a first downward force from top to bottom to the top of the middle area in the arc extension direction of the first preformed structure, causing the first preformed structure to deflect upward.

[0116] When applying a force to the second preformed structure to cause the second preformed structure to deflect upward: support the first spacer 21 on top of the bottom plate 11 of the first preformed structure that has deflected upward; adjust the bottom plate 11 of the second preformed structure to be directly below the first web 12 and the second web 13, and hoist the second preformed structure so that the bottom plate 11 of the second preformed structure is supported on top of the first spacer 21; adjust the two first force application units 5 to be located inside the two ends of the second preformed structure in the arc extension direction in one-to-one correspondence along the extension direction of the first slide rail 6; pass one hook 511 of each chain hoist 51 around the top of the second preformed structure, so that the chain 512 of the chain hoist 51 passes around the top of the second preformed structure; hook the two hooks 511 of each chain hoist 51 to the corresponding two connecting rings 52 in one-to-one correspondence; tighten the chains 512 of the two first force application units 5, so that the two chains 512 apply a second downward force from top to bottom to the tops of the two ends of the second preformed structure in the arc extension direction at the same time, causing the second preformed structure to deflect upward.

[0117] In this embodiment, the exemplary number of the first slide rails 6 is six. Two of the first slide rails 6 are selected according to the size specifications of the preformed structure. It can be understood that the first orientation, the extending direction of the first slide rail 6, and the spacing direction between the two first positioners 4 are all parallel.

[0118] It can be understood that the first force application unit 5 can also adopt other structures capable of applying forces to the first preformed structure and the second preformed structure, as long as it can cause the first preformed structure and the second preformed structure to deflect upward.

[0119] Among them, the two first positioners 4 are used to drive the assembled structure to rotate. This is to facilitate subsequent seam welding of each weld on the outer periphery of the first preformed structure and seam welding of each weld on the outer periphery of the second preformed structure.

[0120] Specifically, as Figure 3 and Figure 14 shown, the first positioner 4 includes at least two rotating parts 41, and the at least two rotating parts 41 have a first working state and a second working state; when the at least two rotating parts 41 are in the first working state, the outer periphery of the at least two rotating parts 41 is arranged as a rotating ring, and the inner periphery of the at least two rotating parts 41 is arranged as an axially penetrating synchronous group welding positioning space 411, and the rotating ring can rotate around its own central axis; when the at least two rotating parts 41 are in the second working state, the synchronous group welding positioning space 411 is opened, and the middle beam 1 can enter and exit the synchronous group welding positioning space 411 and can be supported within the synchronous group welding positioning space 411. With such a setting, when the at least two rotating parts 41 are in the first working state and the assembled structure is fixed in the synchronous group welding positioning space 411, the assembled structure can be driven by the rotating ring to rotate around the central axis of the rotating ring, so that each weld on the outer periphery of the first preformed structure and each weld on the outer periphery of the second preformed structure can be sequentially rotated towards the top of the assembled structure, facilitating seam welding of the welds and effectively ensuring the welding quality of each weld on the outer periphery of the first preformed structure and each weld on the outer periphery of the second preformed structure. It can be understood that the axis of the rotating ring, the central axis of the rotating ring, the first orientation, the extending direction of the first slide rail 6, and the spacing direction between the two first positioners 4 are all parallel.

[0121] Specifically, as Figure 3 and Figure 14 shown, the first positioner 4 further includes a bracket 42, a driving wheel 43 and a driving motor. The driving wheel 43 and the at least two rotating parts 41 are both rotatably connected to the bracket 42; a first toothed part is formed on the outer periphery of the rotating part 41. When the at least two rotating parts 41 are in the first working state, the first toothed parts on the outer periphery of the rotating ring form an external toothed ring, and the driving motor can drive the driving wheel 43 to engage with the external toothed ring. To achieve the rotation of the rotating ring around its own central axis.

[0122] Preferably, as Figure 3 shown, the number of the rotating parts 41 is two, and the outer perimeters of the two rotating parts 41 are both semi-circular. Compared with setting the number of the rotating parts 41 to three or more, it is convenient for the two rotating parts 41 to switch between the first working state and the second working state; secondly, when the two rotating parts 41 are in the second working state, it is convenient for the middle beam 1 to enter and exit the synchronous group welding positioning space 411, and the supporting stability is good when the middle beam 1 is supported in the synchronous group welding positioning space 411.

[0123] Preferably, as Figure 3 shown, the first positioner 4 further includes an auxiliary wheel 44 rotatably connected to the bracket 42, and the auxiliary wheel 44 and the driving wheel 43 are circumferentially spaced apart along the perimeter of one of the rotating parts 41. The outer perimeter of the auxiliary wheel 44 forms a first fitting surface, and the outer perimeter of the rotating part 41 forms a second fitting surface, and the first fitting surface is in contact with the second fitting surface; and / or, the outer perimeter of the auxiliary wheel 44 forms a second toothed part, and the second toothed part meshes with the first toothed part. This makes the driving wheel 43 drive the rotation around its own central axis with good stability. In this embodiment, by way of example, the number of the rotating parts 41 is two, and the number of the auxiliary wheels 44 is one.

[0124] Preferably, as Figure 3 shown, when the assembled structure is fixed in the synchronous group welding positioning space 411, the central axis of the rotating ring is collinear with the central axis of the assembled structure. In other embodiments, when the assembled structure is fixed in the synchronous group welding positioning space 411, the central axis of the rotating ring can also be set to be parallel and spaced apart from the central axis of the assembled structure.

[0125] Specifically, as Figure 3 shown, the first positioner 4 further includes a first limiting unit 45, a second limiting unit 46 and a third limiting unit 47. In this embodiment, when the two rotating parts 41 are in the first working state, the first limiting unit 45 and the second limiting unit 46 can limit the setting position of the assembled structure in the synchronous group welding positioning space 411 along the second orientation, and the third limiting unit 47 can limit the setting position of the assembled structure in the synchronous group welding positioning space 411 along the third orientation, and the second orientation and the third orientation are perpendicular and both perpendicular to the first orientation. Specifically, when the assembled structure is fixed in the synchronous group welding positioning space 411, the second orientation is the direction in which the first web 12 and the second web 13 are spaced apart, and the third orientation is the height direction of the synchronous group welding positioning space 411. So as to be able to completely fix the setting position of the assembled structure in the synchronous group welding positioning space 411, and enable the rotating ring to reliably drive the assembled structure to rotate around the central axis of the rotating ring.

[0126] As Figure 3As shown, the first limiting unit 45 includes a first limiting block 451 and a first lead screw nut assembly. The first lead screw nut assembly includes a first lead screw 452 and a first nut that are threadedly connected. The first nut is rotatably connected to the rotating part 41, the first lead screw 452 is slidably connected to the rotating part 41, the first limiting block 451 is fixedly connected to one end of the first lead screw 452 along the axial direction, and the first nut can drive the first lead screw 452 to slide along its own axial direction; when the two rotating parts 41 are in the first working state, the axial direction of the first lead screw 452 is parallel to the second orientation.

[0127] As Figure 3 shown, the second limiting unit 46 includes a second limiting block 461 and a second lead screw nut assembly. The second lead screw nut assembly includes a second lead screw 462 and a second nut that are threadedly connected. The second nut is rotatably connected to the rotating part 41, the second lead screw 462 is slidably connected to the rotating part 41, the second limiting block 461 is fixedly connected to one end of the second lead screw 462 along the axial direction, and the second nut can drive the second lead screw 462 to slide along its own axial direction; when the two rotating parts 41 are in the first working state, the axial direction of the second lead screw 462 slides with the second orientation. When the two rotating parts 41 are in the first working state, the first limiting block 451 and the second limiting block 461 can approach or move away from each other along the second orientation.

[0128] As Figure 3 shown, the third limiting unit 47 includes a third limiting block 471 and a third lead screw nut assembly. The third lead screw nut assembly includes a third lead screw 472 and a third nut that are threadedly connected. The third nut is rotatably connected to the rotating part 41, the third lead screw 472 is slidably connected to the rotating part 41, the third limiting block 471 is fixedly connected to one end of the third lead screw 472 along the axial direction, and the third nut can drive the third lead screw 472 to slide along its own axial direction; when the two rotating parts 41 are in the first working state, the axial direction of the third lead screw 472 is parallel to the third orientation, and the third lead screw 472 can approach or move away from the bottom wall in the height direction of the synchronous group welding positioning space 411 along the third orientation.

[0129] With such a setting, when the two rotating parts 41 are in the first working state, the first limiting block 451 and the second limiting block 461 can approach or move away from each other along the second orientation, and the third limiting block 471 can approach and move away from the bottom wall of the synchronous group welding positioning space 411 in the height direction of the synchronous group welding positioning space 411, so that the setting positions of assembled structures of different size specifications in the synchronous group welding positioning space 411 can be limited.

[0130] It can be understood that the first limiting unit 45, the second limiting unit 46, and the third limiting unit 47 can also use electric push rods or cylinders, as long as they can limit the setting position of the assembled structure in the synchronous group welding positioning space 411. The specific structure and working principle of the lead screw nut assembly belong to the prior art and will not be elaborated here.

[0131] Preferably, as Figure 3 shown, the number of the first limiting units 45 and the second limiting units 46 is both two; the two first limiting units 45, the two second limiting units 46 and the two rotating parts 41 are arranged in one-to-one correspondence. Further improve the reliability of setting the position of the limited assembly structure in the synchronous group welding positioning space 411.

[0132] Preferably, as Figure 3 and Figure 4 shown, the second slide rail group includes two second slide rails, and each first slide rail 6 of the first slide rail group is located between the two second slide rails, and the extending direction of the first slide rail 6 is parallel to the extending direction of the second slide rail; two roller groups are arranged at the bottom of the bracket 42 of each first positioner 4, and the rollers 421 of the two roller groups are slidably arranged on the two second slide rails in one-to-one correspondence. So as to be able to adjust the two first positioners 4 to approach or move away from each other along the extending direction of the second slide rail, so that the two first positioners 4 can be suitable for driving the assembly structures of different length specifications to rotate around the central axis of the rotating ring, so as to facilitate welding the welds on the outer periphery of the assembly structures of different specifications, and can effectively improve the efficiency of synchronously group welding and forming the two middle beams 1. In this embodiment, the number of the second slide rails is exemplarily set to two.

[0133] Thus, the welding unit, the two first force applying units 5 and the two first positioners 4 are used in cooperation, and can successively complete the upward deflection of the first preformed structure, the upward deflection of the second preformed structure, seam welding of each weld on the outer periphery of the first preformed structure, and seam welding of each weld on the outer periphery of the second preformed structure.

[0134] Among them, as Figure 5 shown, each preformed structure auxiliary forming device includes a base 8, two second force applying units and two second positioners 9.

[0135] Specifically, as Figures 10 - 12 shown, the two second cushion blocks 22, one third cushion block 23 and one fourth cushion block 24 are used for detachably connecting to the tabletop of the base 8 to assist the basic structure to deflect laterally and upward.

[0136] Specifically, the second force applying unit is used to apply a force to the basic structure so that the basic structure can deflect upward and laterally. Exemplarily, the second force applying unit can adopt structures such as a jack and a pressure oil cylinder. The specific structures of the jack and the pressure oil cylinder both belong to the prior art, so they will not be elaborated here.

[0137] Among them, as Figures 5 - 9As shown in the figure, two second positioners 9 are arranged at intervals on both sides of the base 8 in the length direction; the second positioner 9 is provided with a bracket 91. The second positioner 9 can drive the bracket 91 to rotate around a fixed axis and can drive the bracket 91 to lift along its own height direction. The bracket 91 is used to fix the installation position of the basic structure. Specifically, the fixed axis, the length direction of the base 8, the length direction of the basic structure before side deflection and upward deflection, the length direction of the bottom plate 11 before side deflection and upward deflection, the length direction of the first web 12 before side deflection and upward deflection, and the length direction of the second web 13 before side deflection and upward deflection are all parallel. The height direction of the second positioner 9, the height direction of the base 8, and the height direction of the basic structure before side deflection and upward deflection are all parallel.

[0138] As Figures 5 - 9 shown in the figure, two second positioners 9 are arranged at intervals on both sides of the base 8 in the length direction. Each second positioner 9 can drive the corresponding bracket 91 to lift along its own height direction. The brackets 91 of the two second positioners 9 can support the basic structure, so as to be able to drive the basic structure to lift along the height direction, which is convenient for adjusting the quantity, specification and installation position of the pads on the base 8 subsequently; secondly, each second positioner 9 can drive the corresponding bracket 91 to rotate around a fixed axis, which is convenient for driving the basic structure to rotate around the fixed axis subsequently. Specifically, for the middle beam 1 with stiffeners 15, after fixing the overall structure composed of the basic structure and the stiffeners 15 to the bracket 91, driving the overall structure composed of the basic structure and the stiffeners 15 to rotate around the fixed axis, so as to facilitate the upward deflection and side deflection of the basic structure. Compared with the prior art using the hoisting method, the efficiency and safety of forming the middle beam 1 can be effectively improved. In this embodiment, it is preferably that the fixed axis is collinear with the central axis of the basic structure.

[0139] Specifically, the second positioner 9 further includes a second lifting mechanism and a rotating mechanism connected to the output end of the second lifting mechanism. The bracket 91 is connected to the output end of the rotating mechanism; the second lifting mechanism can drive the rotating mechanism and the bracket 91 to lift synchronously along its own height direction, and the rotating mechanism can drive the bracket 91 to rotate around a fixed axis. As an alternative solution, the two second positioners 9 are replaced by two second multi-axis robotic arms. The two brackets 91 are correspondingly connected to the output ends of the two second multi-axis robotic arms. The second multi-axis robotic arm can at least drive the bracket 91 to lift along the height direction of the base 8 and can drive the bracket 91 to rotate around a fixed axis. It can be understood that the second positioner 9 can also be replaced by other driving mechanisms that can drive the bracket 91 to lift along the height direction of the base 8 and can drive the bracket 91 to rotate around a fixed axis. Among them, the specific structures of the second lifting mechanism, the rotating mechanism and the second multi-axis robotic arm all belong to the prior art, so they will not be elaborated here.

[0140] Specifically, as Figures 5 - 9As shown, the bracket 91 is provided with a fourth limiting unit 92, a fifth limiting unit 93 and two groups of sixth limiting units 94. The fourth limiting unit 92 and the fifth limiting unit 93 can limit the basic structure to the bracket 91 along a fourth orientation, and the two groups of sixth limiting units 94 can limit the basic structure to the bracket 91 along a fifth orientation. Specifically, before the basic structure is fixed to the bracket 91 and there is no lateral deflection or upward deflection of the basic structure, the fourth orientation is parallel to the direction spaced from the first web 12 and the second web 13 of the basic structure, and the fifth orientation, the height direction of the basic structure, the height direction of the second positioner 9 and the height direction of the base 8 are all parallel. The fourth orientation and the fifth orientation are perpendicular and both are perpendicular to the length direction of the base 8. In this way, it is possible to limit the installation position of the basic structure on the bracket 91, and to limit the installation position of the overall structure formed by the basic structure and the rib plate 15 on the bracket 91. It can be understood that before the basic structure has no lateral deflection or upward deflection, the length directions of the first web 12, the second web 13, the bottom plate 11, the cover plate 14, the length direction of the basic structure, the length direction of the base 8, and the spacing direction between the two second positioners 9 are all parallel.

[0141] As Figures 7 - 9 shown, by way of example, the number of both the fourth limiting unit 92 and the fifth limiting unit 93 is one, there are two groups of sixth limiting units 94, and the number of sixth limiting units 94 in each group of sixth limiting units 94 is two. The output ends of the fourth limiting unit 92 and the fifth limiting unit 93 can approach or move away from each other along the fourth orientation, and the output ends of the two sixth limiting units 94 in each group of sixth limiting units 94 can approach or move away from each other along the fifth orientation. Specifically, the bracket 91 is further provided with a first mounting seat 95 and a second mounting seat 96, and the first mounting seat 95 and the second mounting seat 96 are spaced apart along the fourth orientation.

[0142] As Figure 7 and Figure 8 shown, the fourth limiting unit 92 includes a fourth limiting block 921 and a fourth lead screw nut assembly arranged on the first mounting seat 95. The fourth lead screw nut assembly includes a fourth lead screw 922 and a fourth nut that are threadedly connected. The fourth nut is rotatably connected to the first mounting seat 95, the fourth lead screw 922 is slidably connected to the first mounting seat 95 along the fourth orientation, the fourth limiting block 921 is fixedly connected to one end of the fourth lead screw 922 along the axial direction, and the fourth nut can drive the fourth lead screw 922 to slide along the fourth orientation.

[0143] As Figure 7 and Figure 8As shown, the fifth limiting unit 93 includes a fifth limiting block 931 and a fifth lead screw nut assembly disposed on the second mounting seat 96. The fifth lead screw nut assembly includes a fifth lead screw 932 and a fifth nut that are threadedly connected. The fifth nut is rotatably connected to the second mounting seat 96, and the fifth lead screw 932 is slidably connected to the second mounting seat 96 along a fourth direction. The fifth limiting block 931 is fixedly connected to one axial end of the fifth lead screw 932, and the fifth nut can drive the fifth lead screw 932 to slide along the fourth direction. The fourth limiting block 921 and the fifth limiting block 931 can approach or move away from each other along the fourth direction.

[0144] As Figure 5 and Figures 7 - 9 shown, both of the two sixth limiting units 94 of one group of the sixth limiting units 94 are disposed on the first mounting seat 95 and are spaced apart along a fifth direction on both sides of the fourth limiting unit 92. Both of the two sixth limiting units 94 of the other group of the sixth limiting units 94 are disposed on the second mounting seat 96 and are spaced apart along the fifth direction on both sides of the fifth limiting unit 93. The sixth limiting unit 94 includes a sliding arm 943, a locking member 944, a sixth limiting block 941, and a sixth lead screw nut assembly. It can be understood that the fifth direction is parallel to the height direction of the second positioner 9.

[0145] As Figures 7 - 9 shown, both of the two sliding arms 943 of one group of the sixth limiting units 94 are slidably disposed on the first mounting seat 95 along the fourth direction, and the two locking members 944 of this group of the sixth limiting units 94 are respectively used to lock the relative positions of the corresponding sliding arms 943 and the first mounting seat 95. Both of the two sliding arms 943 of the other group of the sixth limiting units 94 are slidably disposed on the second mounting seat 96 along the fourth direction, and the two locking members 944 of this group of the sixth limiting units 94 are respectively used to lock the relative positions of the corresponding sliding arms 943 and the second mounting seat 96. In this embodiment, the locking member 944 is a screw.

[0146] As Figures 7 - 9 shown, the sixth lead screw nut assembly includes a sixth lead screw 942 and a sixth nut that are threadedly connected. The sixth nut is used to be rotatably connected to the first mounting seat 95 or the second mounting seat 96, the sixth lead screw 942 is used to be slidably connected to the first mounting seat 95 or the second mounting seat 96 along the fifth direction, the sixth limiting block 941 is fixedly connected to one axial end of the sixth lead screw 942, and the sixth nut can drive the sixth lead screw 942 to slide along the fifth direction, so that the two sixth limiting blocks 941 in each group of the sixth limiting units 94 can approach or move away from each other along the fifth direction.

[0147] Further, as Figures 6 - 8As shown, the bracket 91 is provided with an avoidance space 911 penetrating along the fourth orientation; the fourth lead screw nut assembly, the fifth lead screw nut assembly, and the lead screw nut assemblies of the two groups of sixth limiting units 94 are all located in the avoidance space 911. The fourth lead screw nut assembly and the fifth lead screw nut assembly can limit the basic structure within the avoidance space 911 of the bracket 91 along the fourth orientation, and the lead screw nut assembly of each group of sixth limiting units 94 can limit the basic structure within the avoidance space 911 of the bracket 91 along the fifth orientation.

[0148] With such an arrangement, it is realized that the output ends of the fourth limiting unit 92 and the fifth limiting unit 93 can approach or move away from each other along the fourth orientation, and the output ends of the two sixth limiting units 94 in each group of sixth limiting units 94 can approach or move away from each other along the fifth orientation, so that the relative positions of the basic structure and the bracket 91 can be fixed, it can be applicable to fixing basic structures of different sizes and specifications, and the relative positions of the overall structure composed of the basic structure and the rib plate 15 and the bracket 91 can be fixed; secondly, when the basic structure or the overall structure is supported on the base table 8, the bracket 91 can rise above the basic structure or the overall structure along the height direction of the second positioner 9, and the bracket 91 can descend below the basic structure or the overall structure along the height direction of the second positioner 9, which is convenient for lifting, rotating around a fixed axis, or hoisting the basic structure in the forward or reverse direction, and is convenient for lifting, rotating around a fixed axis, or hoisting the overall structure in the forward or reverse direction, thereby further improving the efficiency of synchronously welding and forming the two middle beams 1. Among them, the overall structure is the overall structure composed of the basic structure and the rib plate 15.

[0149] It can be understood that the fourth limiting unit 92, the fifth limiting unit 93, and the sixth limiting unit 94 can also adopt a limiting mechanism formed by an electric push rod, a cylinder, or a second multi-axis robotic arm, as long as it can limit the setting position of the basic structure on the bracket 91 and can limit the setting position of the overall structure composed of the basic structure and the rib plate 15 on the bracket 91.

[0150] Embodiment III

[0151] This embodiment provides a method for forming a center sill, which is used to synchronously group-weld and form two center sills 1. By adopting this method for forming the center sill, the bottom plates 11, cover plates 14, rib plates 15, first webs 12 and second webs 13 of the two center sills 1 are group-welded and formed, or by adopting this method for forming the center sill, the bottom plates 11, cover plates 14, first webs 12 and second webs 13 of the two center sills 1 are group-welded and formed, both of which can effectively avoid the problems of complex deformation and large deformation amount after the center sill 1 is welded and formed, and there is no need to perform flame straightening on the formed center sill 1, which can effectively improve the quality and efficiency of the formed center sill 1; secondly, this method for forming the center sill first synchronously uses two pre-forming structure auxiliary forming devices to assist in forming the first pre-forming structure and the second pre-forming structure, and then uses an assembly forming device to assist the first pre-forming structure and the second pre-forming structure to synchronously form into the center sill 1. Compared with the prior art in which a single center sill is formed by group-welding at one time, the efficiency of forming the center sill 1 can be further improved. Secondly, by using the center sill forming auxiliary device in Embodiment 2 to assist in implementing this method for forming the center sill, compared with the prior art in which the installation orientation of the overall structure formed in each stage of center sill forming is frequently adjusted by means of hoisting, the efficiency of forming the center sill 1 can be further improved, and the safety of the formed center sill 1 can be effectively improved.

[0152] Specifically, this method for forming the center sill first synchronously uses two pre-forming structure auxiliary forming devices to assist in forming the first pre-forming structure and the second pre-forming structure, and then uses an assembly forming device to assist the first pre-forming structure and the second pre-forming structure to synchronously form into the center sill 1. It can be understood that the methods of using the two pre-forming structure auxiliary forming devices to respectively assist in forming the first pre-forming structure and the second pre-forming structure are exactly the same. Therefore, when describing the forming methods of the first pre-forming structure and the second pre-forming structure below, the forming method of the first pre-forming structure is taken as an example for introduction.

[0153] As Figures 1 - 19 shown, this method for forming the center sill includes:

[0154] S100. Spot-weld the first web 12 and the second web 13 to the bottom plate 11 respectively to form a basic structure.

[0155] Specifically, before performing step S100, first determine whether to set the bottom plate 11 to include at least two sections and butt-weld the seams, whether to set the first web 12 to include at least two sections and butt-weld the seams, and whether to set the second web 13 to include at least two sections and butt-weld the seams according to the length of the expected formed center sill 1.

[0156] When the length of the center beam 1 is greater than or equal to the set length, the bottom plate 11 is provided to include at least two segments and butt-welded, the first web 12 is provided to include at least two segments and butt-welded, and the second web 13 is provided to include at least two segments and butt-welded, and then step S100 is executed. When the length of the center beam 1 is less than the set length, step S100 is directly executed.

[0157] Specifically, the specific method of spot-welding the first web 12 and the second web 13 to the bottom plate 11 to form the basic structure belongs to the prior art, so it will not be elaborated here.

[0158] S200. Rotate the basic structure so that the first web 12 is directly below the second web 13.

[0159] Specifically, step S200 includes:

[0160] S210. Hoist the basic structure onto the brackets 91 of the two second positioners 9, and fix the relative positions of the two ends in the length direction of the basic structure and the brackets 91 of the two second positioners 9 one by one. It can be understood that at this time, the basic structure has not yet undergone lateral deflection and upward deflection.

[0161] Specifically, the specific steps of step S210 include: hoisting the basic structure onto the brackets 91 of the two second positioners 9, so that the two ends of the bottom plate 11 of the basic structure are correspondingly supported on the two sixth limit blocks 941 located below along the fifth orientation in the two second positioners 9; along the fifth orientation, control the two sixth limit units 94 located above in each second positioner 9, so that one of the two sixth limit blocks 941 located above in each second positioner 9 presses against the second web 13, and the other presses against the bottom plate 11; control the fourth limit unit 92 in each second positioner 9, so that the fourth limit blocks 921 in each second positioner 9 press against the second web 13 along the fourth orientation, and control the fifth limit unit 93 in each second positioner 9, so that the fifth limit blocks 931 in each second positioner 9 press against the bottom plate 11 along the fourth orientation. Such settings are used to fix the relative position of the basic structure on the brackets 91 of the two second positioners 9; secondly, compared with first hoisting the basic structure onto the base 8 and then controlling the lifting of the brackets 91 of the two second positioners 9 so that the two ends of the basic structure are correspondingly supported on the two sixth limit blocks 941 located below along the fifth orientation in the two second positioners 9, the positioning method is simple and efficient.

[0162] As an alternative solution, step S210 is as follows: Hoist and support the basic structure on the base 8, such that the bottom plate 11 of the basic structure is supported on the tabletop of the base 8; Control the two second positioners 9 to drive their respective brackets 91 to rise along their respective height directions, such that the two sixth limit blocks 941 located below in each second positioner 9 abut against the bottom plate 11 of the basic structure from bottom to top; Along the fifth orientation, control the two sixth limit units 94 located above in each second positioner 9, such that one of the two sixth limit blocks 941 located above in each second positioner 9 presses against the second web 13, and the other presses against the bottom plate 11; Control the fourth limit unit 92 in each second positioner 9, such that the fourth limit blocks 921 in each second positioner 9 press against the second web 13 along the fourth orientation, control the fifth limit unit 93 in each second positioner 9, such that the fifth limit blocks 931 in each second positioner 9 press against the bottom plate 11 along the fourth orientation; Control the two second positioners 9 to drive their respective brackets 91 to rise along their respective height directions, such that the bottom plate 11 of the basic structure moves away from the tabletop of the base 8.

[0163] S220. Control the two second positioners 9 to drive the corresponding brackets 91 to rotate synchronously around a fixed axis, so as to drive the basic structure to rotate synchronously around the fixed axis until the first web 12 is located directly below the second web 13.

[0164] S300. Apply a fourth force to the basic structure to deform the basic structure into a third arc shape, the center of the third arc shape is relatively far from the first web 12 with respect to the second web 13, and the chord height of the third arc shape is a third preset chord height. The third preset chord height is less than the limit side deflection chord height.

[0165] Specifically, the limit side deflection chord height is: On the basis of ensuring the structural strength and function of the middle beam 1, the chord height value corresponding to the maximum side deflection that the middle beam 1 can undergo. The limit side deflection chord height is an empirical value obtained from a large number of previous tests. It can be understood that for middle beams 1 with different sizes, shapes, and material specifications, the values of the limit side deflection chord height are different.

[0166] Specifically, the spacer includes two second spacers 22. Step S300 includes:

[0167] S310. Control each of the sixth limit units 94 in the two second positioners 9 so that a first limit avoidance gap is formed between each sixth limit block 941 abutting against the second web 13 in each second positioner 9 and the second web 13, and a first limit avoidance gap is formed between each sixth limit block 941 abutting against the bottom plate 11 in each second positioner 9 and the bottom plate 11. Control the fourth limit units 92 in the two second positioners 9 so that a second limit avoidance gap is formed between the fourth limit block 921 of each second positioner 9 and the second web 13, and the second limit avoidance gap is equal to the sum of the side deflection avoidance gap and N times the misalignment gap, where N is a positive number greater than 1.

[0168] With such a setting, during the execution of step S320, situations such as the second web 13 being press-deformed due to the continued descent of the fourth limit block 921 when the first web 12 is supported on the two second cushion blocks 22 are avoided. Secondly, after the execution of step S320, it is ensured that the clearance between each fourth limit block 921 and the second web 13 is greater than or equal to the side deflection avoidance gap, so that the basic structure can effectively undergo side deflection deformation into a third arc shape.

[0169] Specifically, the misalignment gap refers to the misalignment amount that may occur when the basic structure is supported on the support surface and the bracket 91 may continue to descend. For step S310, the support surface is the top surface of the second cushion block 22 along the height direction of the base 8.

[0170] Specifically, the value of the side deflection avoidance gap is such that it can ensure that the basic structure undergoes side deflection deformation into a third arc shape, and the chord height of the third arc shape is the third preset chord height. The value of the side deflection avoidance gap is greater than or equal to the value of one times the third preset chord height.

[0171] Specifically, the value of the first limit avoidance gap is such that it can ensure that the basic structure effectively undergoes side deflection deformation and avoid the tipping of the basic structure. When the basic structure tips, the basic structure can abut against at least one sixth limit block 941.

[0172] Exemplarily, the value of the first limit avoidance gap is set to be greater than zero and less than 3 mm.

[0173] Since the first web 12 is located directly below the second web 13 at this time, the value of the first limit avoidance gap is set to be greater than zero and less than 3 mm, so that when a fourth acting force is applied to the middle region in the length direction of the basic structure, the basic structure can effectively deform and can effectively avoid the tipping of the basic structure. The value of the side deflection avoidance gap is set to be greater than or equal to one times the third preset chord height, so that the basic structure can effectively deform into a third arc shape and the chord height of the third arc shape can be the third preset chord height.

[0174] It can be understood that the value range of the first limit avoidance gap and the value of the side deflection avoidance gap can also be adaptively adjusted according to the actual working conditions.

[0175] S320, as Figure 10 shown, control the two second positioners 9 to drive the corresponding brackets 91 to synchronously descend along their own height directions until the first web 12 is supported on the two second pads 22, and the two second pads 22 are respectively located inside both ends of the first web 12 in the length direction. Specifically, before performing step S320, level the base 8 in advance, and connect the two second pads 22 to the tabletop of the base 8 in advance.

[0176] Preferably, the top surface of the second pad 22 along the height direction of the base 8 is an arc surface, and the arc surface is in arc-shaped matching with the third arc. It can improve the quality of bending the basic structure into the third arc shape. As an alternative, the top surface of the second pad 22 along the height direction of the base 8 is a flat surface.

[0177] S330, apply a fourth acting force from top to bottom along the height direction of the base 8 to the middle area in the length direction of the basic structure, so that the middle area in the length direction of the basic structure is bent downward into the third arc shape, and the center of the third arc shape is relatively far from the first web 12 with respect to the second web 13.

[0178] Preferably, along the height direction of the base 8, the maximum height of the second pad 22 is equal to the third preset chord height; when the middle area in the length direction of the basic structure abuts against the tabletop of the base 8 along the height direction of the base 8, the chord height of the third arc shape is the third preset chord height.

[0179] Specifically, when the basic structure is supported on the two second pads 22, along the height direction of the base 8, the height difference between the lowermost end of the basic structure and the tabletop of the base 8 is the third preset chord height. When the middle area in the length direction of the basic structure abuts against the tabletop of the base 8 along the height direction of the base 8, the chord height of the third arc shape is the third preset chord height.

[0180] As an alternative, the maximum height of the two second pads 22 along the height direction of the base 8 can also be set to be greater than the third preset chord height according to the size specifications of the basic structure. When applying a fourth acting force from top to bottom along the height direction of the base 8 to the middle area in the length direction of the basic structure, it can also realize bending the basic structure into the third arc shape, the center of the third arc shape is relatively far from the first web 12 with respect to the second web 13, and the chord height of the third arc shape is the third preset chord height.

[0181] Specifically, along the height direction of the base 8, apply a fourth acting force from top to bottom to the middle area in the length direction of the basic structure through the second force application unit.

[0182] Set it like this to initially make the two basic structures form prefabricated lateral deflection and reverse deformation, so that during the subsequent seam welding of the welds on the outer periphery of the first preformed structure and the seam welding of the welds on the outer periphery of the second preformed structure, the lateral deflection deformation formed by the seam welding of the welds on the outer periphery of the first preformed structure and the seam welding of the welds on the outer periphery of the second preformed structure can be offset (the prefabrication of lateral deflection and reverse deformation is to bend the overall structure to one side to form a third arc shape, and the lateral deflection deformation is that the overall structure bends to the other side to form a fourth arc shape after welding and shrinking. The openings of the first arc shape and the fourth arc shape are opposite to each other, so that the lateral deflection deformation caused by welding can be offset after the overall structure is welded), so that the formed center beam 1 basically has no lateral deflection phenomenon. Therefore, compared with the prior art, the problem of complex deformation and large deformation amount after the center beam 1 is welded and formed can be effectively reduced, the problem of flame straightening of the formed center beam 1 caused by lateral deflection can be effectively avoided, and the problem of reduced structural strength of the center beam 1 caused by flame straightening can be effectively avoided.

[0183] Specifically, if the center beam 1 further includes stiffeners 15, then after step S300, step S400 and the remaining steps after step S400 are executed.

[0184] Specifically, if the center beam 1 does not include stiffeners 15, then after step S300, step S500 is executed, and then step S1000 and the remaining steps after step S1000 are executed. As an alternative, if the center beam 1 does not include stiffeners 15, then after step S300 is completed, steps S500 to S700 are executed, and then step S900 and the remaining steps after step S900 are executed.

[0185] S400: Seam weld a plurality of stiffeners 15 to the inner side of the first web 12 so that the plurality of stiffeners 15 are distributed at intervals along the arc extension direction of the first web 12. Among them, the inner side of the first web 12 is the side of the first web 12 close to the second web 13.

[0186] Preferably, as Figure 10 shown, step S400 includes:

[0187] S410: Divide a plurality of stiffeners 15 into two first sub-stiffener groups and two second sub-stiffener groups.

[0188] S420: Synchronously seam weld the first sub-stiffeners 151 of the two first sub-stiffener groups to the first web 12 along the direction from the middle to both ends of the arc extension direction of the first web 12, and make the first sub-stiffeners 151 of the two first sub-stiffener groups be distributed at intervals along the arc extension direction of the first web 12.

[0189] It can be understood that the first sub-stiffeners 151 of the two first sub-stiffener groups are synchronously seam welded starting from the middle of the arc extension direction of the first web 12.

[0190] S430. Along the direction of the arc extension of the first web 12 from the middle to both ends, synchronously seam-weld the second sub-rib plates 152 of the two second sub-rib plate groups to the first web 12, and arrange one second sub-rib plate 152 between any two adjacent first sub-rib plates 151.

[0191] It can be understood that the second sub-rib plates 152 of the two second sub-rib plate groups are synchronously seam-welded starting from the middle area in the arc extension direction of the first web 12.

[0192] Arrange one second sub-rib plate 152 between any two adjacent first sub-rib plates 151. This enables the deformation degree of the first web 12 to be reduced as small as possible during the process of seam-welding the rib plate 15 to the first web 12.

[0193] Further preferably, along the direction of the arc extension of the first web 12 from the middle to both ends, the distance between any two adjacent first sub-rib plates 151 gradually decreases, and the distance between any two adjacent second sub-rib plates 152 gradually decreases. With such an arrangement, on the basis of ensuring the strengthening function of the rib plate 15, the number of rib plates 15 can be reduced, and the efficiency of forming the middle beam 1 can be further improved. As an alternative solution, multiple rib plates 15 can also be arranged at equal intervals or distributed according to other set distance rules along the arc extension direction of the first web 12.

[0194] Specifically, the rib plate 15 is seam-welded to the first web 12 through a welding unit.

[0195] S500. Remove the fourth acting force.

[0196] Specifically, when the fourth acting force is removed, the lateral deflection of the basic structure will decrease due to the removal of the external force.

[0197] For the middle beam 1 including the rib plate 15, in order to ensure the lateral deflection of the basic structure and to facilitate connecting the rib plate 15 to the second web 13, step S600 and the remaining steps after step S600 are executed after step S500.

[0198] For the middle beam 1 not including the rib plate 15, it is preferably to execute step S500 after step S300 is completed, and then execute step S1000 and the remaining steps after step S1000. It can be understood that for the middle beam 1 not including the rib plate 15, the lateral deflection reverse deformation prefabrication of the middle beam 1 is completed when the fourth acting force is removed.

[0199] As an alternative, for the center beam 1 without the rib plate 15, after step S300 is executed, steps S500 to S700 are executed, then steps S900 and the remaining steps after step S900 are executed. This enables the basic structure to form a better prefabrication of lateral deflection reverse deformation.

[0200] S600. Rotate the basic structure so that the second web 13 is directly below the first web 12.

[0201] Specifically, step S600 includes:

[0202] S610. Control the two second positioners 9 to drive the corresponding brackets 91 to synchronously rise along their own height directions, and fix the relative positions of the two ends in the arc extension direction of the basic structure and the brackets 91 of the two second positioners 9 one by one.

[0203] Specifically, the specific steps of fixing the relative positions of the two ends in the arc extension direction of the basic structure and the brackets 91 of the two second positioners 9 one by one are similar to step S210, so they will not be elaborated here.

[0204] S620. Control the two second positioners 9 to drive the corresponding brackets 91 to synchronously rotate around a fixed axis, so as to drive the basic structure to synchronously rotate around the fixed axis until the second web 13 is directly below the first web 12.

[0205] S700. Apply a fifth acting force to the basic structure to deform the basic structure into a third arc shape.

[0206] Specifically, the spacer block further includes a third spacer block 23. Step S700 includes:

[0207] S710. Control each sixth limiting unit 94 in the two second positioners 9, so that a first limiting avoidance gap is formed between each sixth limiting block 941 in each second positioner 9 that abuts against the second web 13 and the second web 13, and a first limiting avoidance gap is formed between each sixth limiting block 941 in each second positioner 9 that abuts against the bottom plate 11 and the bottom plate 11. Control the fifth limiting unit 93 in the two second positioners 9, so that a second limiting avoidance gap is formed between each fifth limiting block 931 in each second positioner 9 and the bottom plate 11.

[0208] With such a setting, after step S720 is executed, it is ensured that the gap amount between each fifth limiting block 931 and the bottom plate 11 is greater than or equal to the lateral deflection avoidance gap, so that the basic structure can effectively undergo lateral deflection and deform into a third arc shape.

[0209] S720. As Figure 11As shown, control the two second positioners 9 to drive the corresponding brackets 91 to synchronously descend along their own height directions until the second web 13 is supported on a third cushion block 23, and a third cushion block 23 is located in the middle area of the arc extension direction of the second web 13. Specifically, before performing step S720, detach the two second cushion blocks 22 in advance and connect a third cushion block 23 to the tabletop of the base 8.

[0210] Preferably, the top surface of the third cushion block 23 along the height direction of the base 8 is an arc surface, and the arc surface is arc-shaped and matched with the third arc. It can improve the quality of bending the basic structure into the third arc shape. As an alternative, the top surface of the second cushion block 22 along the height direction of the base 8 is a flat surface.

[0211] S730. Apply a fifth acting force simultaneously to the areas near both ends in the arc extension direction of the basic structure from top to bottom along the height direction of the base 8, so that the areas near both ends in the arc extension direction of the basic structure are synchronously bent downward into the third arc shape, and the center of the third arc shape is far from the first web 12 relative to the second web 13.

[0212] Preferably, along the height direction of the base 8, the maximum height of the third cushion block 23 is equal to the third preset chord height; when both ends in the arc extension direction of the basic structure abut against the tabletop of the base 8 along the height direction of the base 8, the chord height of the third arc shape is the third preset chord height.

[0213] As an alternative, it is also possible to adaptively set the maximum height of a third cushion block 23 along the height direction of the base 8 to be greater than the third preset chord height according to the size specification of the basic structure. When applying a fifth acting force simultaneously to the areas near both ends in the length direction of the basic structure from top to bottom along the height direction of the base 8, it is also possible to bend the basic structure into the third arc shape, the center of the third arc shape is far from the first web 12 relative to the second web 13, and the chord height of the third arc shape is the third preset chord height.

[0214] Specifically, along the height direction of the base 8, apply a fifth acting force from top to bottom to both ends in the arc extension direction of the basic structure through two second force application units respectively.

[0215] S800. Sew and weld a plurality of rib plates 15 to the inner side of the second web 13. Among them, the inner side of the second web 13 is the side of the second web 13 close to the first web 12.

[0216] Specifically, the specific method of sewing and welding a plurality of rib plates 15 to the inner side of the second web 13 is similar to the specific method of sewing and welding a plurality of rib plates 15 to the inner side of the first web 12. Therefore, it will not be elaborated here.

[0217] Specifically, sew and weld the rib plates 15 to the second web 13 through a welding unit.

[0218] S900. Remove the fifth force.

[0219] It can be understood that after the gusset plates 15 are all seam-welded to the inner side of the second web 13, the gusset plates 15 and the basic structure form an integral structure. Since two forces (the fourth force and the fifth force) are applied to the basic structure before and after, and the gusset plates 15 are seam-welded to the basic structure, after the fifth force is removed, the side deflection of the integral structure formed by the gusset plates 15 and the basic structure decreases less, resulting in a better prefabrication of side deflection reverse deformation, and there is no need to continuously apply external force to maintain the side deflection of the integral structure.

[0220] S1000. Rotate the basic structure so that the bottom plate 11 of the basic structure is located directly below the corresponding first web 12 and second web 13.

[0221] Specifically, step S1000 includes:

[0222] S1001. Control the two second positioners 9 to drive the corresponding brackets 91 to move synchronously along their own height directions, and fix the relative positions of the two ends of the arc extension direction of the basic structure and the brackets 91 of the two second positioners 9 one by one.

[0223] Specifically, the specific steps of fixing the relative positions of the two ends of the arc extension direction of the basic structure and the brackets 91 of the two second positioners 9 one by one are similar to those of step S210, so they will not be elaborated here.

[0224] S1002. Control the two second positioners 9 to drive the corresponding brackets 91 to rotate synchronously around a fixed axis, so as to drive the basic structure to rotate synchronously around the fixed axis until the bottom plate 11 is located directly below the first web 12 and the second web 13.

[0225] S1100. Apply a third force to the basic structure to deform it into a second arc shape, the center of the second arc shape is away from the first web 12 and the second web 13 relative to the bottom plate 11 of the basic structure, and the chord height of the second arc shape is the second preset chord height.

[0226] Wherein, the second preset chord height is greater than the first preset chord height and less than the limit upward deflection chord height.

[0227] Specifically, the limit upward deflection chord height is: on the basis of ensuring the structural strength and function of the middle beam 1, the chord height value corresponding to the maximum upward deflection that the middle beam 1 can occur. The limit upward deflection chord height is an empirical value obtained from a large number of previous tests. It can be understood that for middle beams 1 with different sizes, shapes and material specifications, the values of the limit upward deflection chord height are different.

[0228] Specifically, the spacer also includes a fourth spacer 24. Step S1100 includes:

[0229] S1101. Control the fourth limit units 92 in the two second position changers 9 so that the fourth limit blocks 921 of each second position changer 9 are all away from the second web 13; control the fifth limit units 93 in the two second position changers 9 so that the fifth limit blocks 931 of each second position changer 9 are all away from the bottom plate 11; control each of the sixth limit units 94 in the two second position changers 9 so that each of the sixth limit blocks 941 of each second position changer 9 is all away from the basic structure.

[0230] S1102. As Figure 12 shown, control the two second position changers 9 to drive the corresponding brackets 91 to synchronously descend along their own height directions until the bottom plate 11 of the basic structure is supported on a fourth cushion block 24, and a fourth cushion block 24 is located in the middle area of the arc extension direction of the bottom plate 11. Specifically, before performing step S1102, detach a third cushion block 23 in advance and connect a fourth cushion block 24 to the tabletop of the base 8.

[0231] Preferably, the top surface of the fourth cushion block 24 along the height direction of the base 8 is an arc surface, and the arc surface is in arc-shaped matching with the second arc. It can improve the quality of bending the basic structure into the second arc shape. As an alternative, the top surface of the fourth cushion block 24 along the height direction of the base 8 is a plane.

[0232] S1103. Apply a third acting force simultaneously to the areas near both ends in the arc extension direction of the basic structure from top to bottom along the height direction of the base 8, so that the areas near both ends in the arc extension direction of the basic structure are synchronously bent downward into the second arc shape, and the center of the second arc shape is far away from the first web 12 and the second web 13 relative to the bottom plate 11 of the basic structure.

[0233] Preferably, along the height direction of the base 8, the maximum height of the fourth cushion block 24 is equal to the second preset chord height; when both ends in the arc extension direction of the basic structure are in contact with the tabletop of the base 8 along the height direction of the base 8, the chord height of the second arc shape is the second preset chord height.

[0234] As an alternative, it is also possible to adaptively set the maximum height of a fourth cushion block 24 along the height direction of the base 8 to be greater than the second preset chord height according to the size specification of the basic structure. When applying a third acting force simultaneously to the areas near both ends in the length direction of the basic structure from top to bottom along the height direction of the base 8, it is also possible to bend the basic structure into the second arc shape, and the center of the second arc shape is far away from the first web 12 and the second web 13 relative to the bottom plate 11. And the chord height of the second arc shape is the second preset chord height.

[0235] Specifically, along the height direction of the base 8, apply a third acting force simultaneously to the areas near both ends in the arc extension direction of the basic structure through two second force application units.

[0236] It is set in such a way that the overall structure formed by the base structure and the rib plate 15 forms an upward deflection pre-deformation prefabrication, so that during the process of seam welding the welds on the outer periphery of the first preformed structure and the welds on the outer periphery of the second preformed structure subsequently, the upward deflection pre-deformation prefabrication formed can offset the downward deflection trend generated by the weld shrinkage, making the upward deflection amount of the finally formed middle beam 1 smaller and within the allowable upward deflection amount range of the middle beam 1, thereby effectively avoiding the problem that the formed middle beam 1 needs to be flame straightened due to the downward deflection caused by weld shrinkage, and further avoiding the problem of the reduction of the structural strength of the middle beam 1 caused by flame straightening.

[0237] Specifically, if the upward deflection pre-deformation prefabrication is not performed on the middle beam 1, downward deflection will occur after all welding is completed, especially the last weld will cause a large downward deflection amount, and when the middle beam 1 is applied to a vehicle and the vehicle load is large, the downward deflection amount of the middle beam 1 will be aggravated. Therefore, it is preferable that the middle beam 1 still has a certain upward deflection amount after forming, and this part of the upward deflection amount is flattened by the subsequent vehicle load, so that the middle beam 1 reaches the ideal working state.

[0238] For the middle beam 1 including the rib plate 15, the step S1200 is as follows:

[0239] S1200, seam-weld the rib plate 15 to the bottom plate 11; seam-weld the inner side of the first web 12 to the bottom plate 11; seam-weld the inner side of the second web 13 to the bottom plate 11.

[0240] Preferably, seam-welding the rib plate 15 to the bottom plate 11, seam-welding the inner side of the first web 12 to the bottom plate 11, and seam-welding the inner side of the second web 13 to the bottom plate 11 are carried out in sequence.

[0241] Further preferably, when seam-welding the rib plate 15 to the bottom plate 11, along the arc extension direction of the bottom plate 11 from the middle to both ends, the multiple rib plates 15 are divided into two groups, and the two groups of rib plates 15 are seam-welded to the bottom plate 11 synchronously.

[0242] Further preferably, when seam-welding the inner side of the first web 12 to the bottom plate 11, along the arc extension direction of the bottom plate 11 from the middle to both ends, the first web 12 is divided into two parts, and the two parts of the first web 12 are seam-welded to the bottom plate 11 synchronously.

[0243] Further preferably, when seam-welding the inner side of the second web 13 to the bottom plate 11, along the arc extension direction of the bottom plate 11 from the middle to both ends, the second web 13 is divided into two parts, and the two parts of the second web 13 are seam-welded to the bottom plate 11 synchronously.

[0244] Specifically, the rib is connected to the bottom plate 11, the inner side of the first web 12 is seam-welded to the bottom plate 11, and the inner side of the second web 13 is seam-welded to the bottom plate 11 through a welding unit.

[0245] For the case where the web plate 15 is not included in the center beam 1, step S1200 is as follows:

[0246] S1200. Seam-weld the inner side of the first web plate 12 to the bottom plate 11; seam-weld the inner side of the second web plate 13 to the bottom plate 11.

[0247] Preferably, the seam-welding of the inner side of the first web plate 12 to the bottom plate 11 and the seam-welding of the inner side of the second web plate 13 to the bottom plate 11 are carried out sequentially.

[0248] Preferably, when seam-welding the inner side of the first web plate 12 to the bottom plate 11, along the length direction of the bottom plate 11 from the middle to both ends, the first web plate 12 is divided into two parts, and the two parts of the first web plate 12 are seam-welded to the bottom plate 11 synchronously.

[0249] Further preferably, when seam-welding the inner side of the second web plate 13 to the bottom plate 11, along the arc extension direction of the bottom plate 11 from the middle to both ends, the second web plate 13 is divided into two parts, and the two parts of the second web plate 13 are seam-welded to the bottom plate 11 synchronously.

[0250] Specifically, the inner side of the first web plate 12 is seam-welded to the bottom plate 11 and the inner side of the second web plate 13 is seam-welded to the bottom plate 11 through a welding unit.

[0251] S1300. Spot-weld the cover plate 14 of the center beam 1 to the first web plate 12 and the second web plate 13.

[0252] Specifically, as Figure 13 shown, the specific steps of step S1300 include:

[0253] S1301. Set the cover plate 14 to include at least two sub-cover plate parts 141.

[0254] Specifically, the specific steps of setting the cover plate 14 to include at least two sub-cover plate parts 141 include: dividing one cover plate 14 into at least two sub-cover plate parts 141; or directly obtaining two sub-cover plate parts 141 such that the total splicing length of the two sub-cover plate parts 141 is equal to the length of the cover plate 14.

[0255] S1302. Locate the relative positions of the first web plate 12, the second web plate 13 and at least two sub-cover plate parts 141, so that at least two sub-cover plate parts 141 are arranged in sequence along the arc extension direction of the first web plate 12 and the second web plate 13, and along the direction perpendicular to the first web plate 12 and the second web plate 13, the first ends of the end faces close to each other on any two adjacent sub-cover plate parts 141 contact the second web plate 13 at the first position 142.

[0256] S1303. Spot-weld all the located at least two sub-cover plate parts 141 to the first web plate 12 and the second web plate 13.

[0257] When the number of the sub-cover plate parts 141 is two, the first position 142 is located at the middle position in the arc extension direction of the second web 13; when the number of the sub-cover plate parts 141 is greater than or equal to 3, the first positions 142 are distributed at intervals along the arc extension direction of the second web 13.

[0258] More specifically, when positioning the relative positions of the first web 12, the second web 13 and at least two sub-cover plate parts 141, a fixture or the like can be used to press the preliminarily positioned sub-cover plate parts 141 against the first web 12 and the second web 13.

[0259] Since the overall structure formed by the basic structure and the rib plate 15 has side deflection and upward deflection at this time, it can be understood that when using a fixture or the like to press the preliminarily positioned sub-cover plate parts 141 against the first web 12 and the second web 13, each sub-cover plate part 141 is positioned to form side deflection and upward deflection adapted to the basic structure. Therefore, in order to make each sub-cover plate part 141 generate side deflection and upward deflection adapted to the shape of the overall structure, along the direction perpendicular to the first web 12 and the second web 13, a fitting gap 143 needs to be formed between the second ends of the end faces close to each other on any two adjacent sub-cover plate parts 141.

[0260] Preferably, the cover plate 14 is set to two sub-cover plate parts 141 with equal lengths. Compared with setting three or more sub-cover plate parts 141, the efficiency of spot welding the sub-cover plate parts 141 to the first web 12 and the second web 13 is high, and the finally formed middle beam 1 has high structural strength and good aesthetics.

[0261] Specifically, the sub-cover plate parts 141 are spot welded to the first web 12 and the second web 13 through a welding unit.

[0262] S1400. Remove the third acting force.

[0263] At this time, the cover plate 14, the bottom plate 11, the first web 12 and the second web 13 of one of the middle beams 1 form a first preformed structure.

[0264] Similarly, the method of forming a second preformed structure with the cover plate 14, the bottom plate 11, the first web 12 and the second web 13 of the other middle beam 1 is similar to the method of steps S100 to S1400, so it will not be repeated here.

[0265] It can be understood that when the third acting force is removed, the upward deflection amount of the first preformed structure will decrease due to the removal of the external force. But it is convenient to deform the first preformed structure into a first arc shape subsequently, and it is also convenient to deform the second preformed structure into a first arc shape subsequently.

[0266] S1500. Move the first preformed structure to the preset synchronous group welding position, and make the bottom plate 11 of the first preformed structure located directly above the first web 12 and the second web 13.

[0267] Specifically, the specific steps of step S1500 include:

[0268] S1501. Control the two second positioners 9 to drive the corresponding brackets 91 to synchronously rise along their own height directions, and fix the relative positions of the two ends of the first preformed structure along the arc extension direction and the brackets 91 of the two second positioners 9 one by one.

[0269] S1502. Control the two second positioners 9 to drive the corresponding brackets 91 to synchronously rotate around a fixed axis, so as to drive the first preformed structure to synchronously rotate around the fixed axis until the bottom plate 11 of the first preformed structure is located directly above the first web 12 and the second web 13.

[0270] S1503. Along the fifth orientation, control the two upper sixth limiting units 94 in each second positioner 9 to move away from the first preformed structure; control the fourth limiting unit 92 in each second positioner 9, so that the fourth limiting blocks 921 in each second positioner 9 move away from the second web 13 along the fourth orientation; control the fifth limiting unit 93 in each second positioner 9, so that the fifth limiting blocks 931 in each second positioner 9 move away from the bottom plate 11 along the fourth orientation. This facilitates the subsequent transfer of the first preformed structure to the two first positioners 4.

[0271] S1504. Lift and install the first preformed structure onto the two first positioners 4, so that the two ends of the first preformed structure along the arc extension direction are respectively supported within the synchronous group welding positioning spaces 411 of the two first positioners 4 to reach the preset synchronous group welding position. During this process, keep the bottom plate 11 of the first preformed structure located directly above the first web 12 and the second web 13.

[0272] S1600. Apply a first acting force to the first preformed structure to deform it into a first arc shape. The center of the first arc shape is relatively far from the first web 12 and the second web 13 with respect to the bottom plate 11 of the first preformed structure, and the chord height of the first arc shape is the first preset chord height.

[0273] Specifically, the specific steps of step S1600 include: Apply a first acting force to the middle area of the first preformed structure from top to bottom along the height direction of the first positioner 4 until the first preformed structure is deformed into a first arc shape.

[0274] Specifically, the specific steps of applying a first acting force to the middle area of the first preformed structure from top to bottom along the height direction of the first positioner 4 until the first preformed structure is deformed into a first arc shape include: AsFigure 4 and Figure 14 As shown in Figure 14 , a first force - applying unit 5 is adopted. One hook 511 of the hand - operated hoist 51 is bypassed around the top of the first pre - formed structure, so that the chain 512 of the hand - operated hoist 51 bypasses the top of the first pre - formed structure; the two hooks 511 of the hand - operated hoist 51 are respectively hung on the corresponding two connecting rings 52; the hand - operated hoist 51 is moved to the middle area in the arc - extending direction of the first pre - formed structure; the chain 512 is tightened, and the chain 512 applies a first force from top to bottom to the top of the middle area in the arc - extending direction of the first pre - formed structure until the first pre - formed structure is deformed into a first arc shape.

[0275] Specifically, a measuring ruler or a measuring line is used to measure that the chord height of the first arc shape is the first preset chord height.

[0276] S1700, as Figure 14 shown in Figure 14 , the first cushion block 21 is arranged on top of the bottom plate 11 of the first pre - formed structure.

[0277] Preferably, along the height direction of the first positioner 4, both the top surface and the bottom surface of the first cushion block 21 are arc - shaped, and the arc shape matches the first arc shape. This facilitates the subsequent bending of the second pre - formed structure into the first arc shape.

[0278] Further preferably, the number of the first cushion blocks 21 is multiple, and the multiple first cushion blocks 21 are sequentially arranged at intervals along the arc - extending direction of the first pre - formed structure on top of the bottom plate 11 of the first pre - formed structure; along the height direction of the first positioner 4, the maximum height of each first cushion block 21 is equal to twice the corresponding chord height at its position. Subsequently, it can not only support the second pre - formed structure, but also facilitate the bending of the second pre - formed structure into the first arc shape.

[0279] S1800, as Figure 14 shown in Figure 14 , the second pre - formed structure is moved to the preset synchronous group welding position, and the bottom plate 11 of the second pre - formed structure is stacked on top of the first cushion block 21.

[0280] Specifically, the specific steps of step S1800 include: hoisting the second pre - formed structure to the two first positioners 4, and during this process, keeping the bottom plate 11 of the second pre - formed structure directly below the first web 12 and the second web 13; stacking the bottom plate 11 of the second pre - formed structure on top of the first cushion block 21.

[0281] Since when the second pre - formed structure is formed, the bottom plate 11 of the second pre - formed structure is directly below the first web 12 and the second web 13, the second pre - formed structure can be directly hoisted to the two first positioners 4, and during this process, it is only necessary to keep the bottom plate 11 of the second pre - formed structure directly below the first web 12 and the second web 13.

[0282] S1900, as Figure 14 shown, apply a second force to the second preformed structure to deform the second preformed structure into a first arc shape, and the arc openings of the first preformed structure and the second preformed structure face each other.

[0283] Specifically, the specific steps of step S1900 include: synchronously apply a second force to both ends of the second preformed structure in the arc extension direction from top to bottom along the height direction of the first positioner 4 until the second preformed structure is deformed into a first arc shape.

[0284] Specifically, the specific steps of synchronously applying a second force to both ends of the second preformed structure in the arc extension direction from top to bottom along the height direction of the first positioner 4 until the second preformed structure is deformed into a first arc shape include: bypass the top of the second preformed structure with one hook 511 of the chain hoist 51 of each of the two first force application units 5, so that the chain 512 of each chain hoist 51 bypasses the top of the second preformed structure; hang the two hooks 511 of each chain hoist 51 on the corresponding two connecting rings 52 one by one; move one chain hoist 51 to one end of the second preformed structure in the arc extension direction, and move the other chain hoist 51 to the other end of the second preformed structure in the arc extension direction; tighten the chains 512 of the two chain hoists 51, and the chains 512 of the two chain hoists 51 synchronously apply a second force to the tops of both ends of the second preformed structure in the arc extension direction from top to bottom one by one until the second preformed structure is deformed into a first arc shape.

[0285] Specifically, as Figure 14 shown, since the number of the first cushion blocks 21 is multiple, the multiple first cushion blocks 21 are sequentially arranged at intervals on the top of the bottom plate 11 of the first preformed structure along the arc extension direction of the first preformed structure; and along the height direction of the first positioner 4, the maximum height of each first cushion block 21 is equal to twice the corresponding chord height at the corresponding position. Therefore, when the second preformed structure is deformed into a first arc shape, both ends of the second preformed structure in the arc extension direction are correspondingly supported at both ends of the first preformed structure in the arc extension direction.

[0286] As an alternative solution, it can also be adaptively set according to the dimensional specifications of the first preformed structure: the number of the first cushion blocks 21 is multiple, and the multiple first cushion blocks 21 are sequentially arranged at intervals along the arc extension direction of the first preformed structure on the top of the bottom plate 11 of the first preformed structure; and along the height direction of the first positioner 4, the maximum height of each first cushion block 21 is equal to the sum of twice the corresponding chord height at the corresponding position and a fixed value; the fixed value is a positive number greater than zero. It is also possible to realize that the second preformed structure is bent and deformed into a first arc shape. It can be understood that in this way, the height difference between the two ends of the second preformed structure in the arc extension direction and the two ends of the first preformed structure in the arc extension direction is a fixed value.

[0287] S2000. As Figure 15 shown, along the interval direction of the first web 12 and the second web 13, the first process positioning plate 31 is spot-welded and positioned on the first side of the bottom plate 11 of the first preformed structure and the bottom plate 11 of the second preformed structure, and the second process positioning plate 32 is spot-welded and positioned on the second side of the bottom plate 11 of the first preformed structure and the bottom plate 11 of the second preformed structure to fix the relative positions of the first preformed structure, the second preformed structure and the first cushion block 21, thereby forming an assembled structure.

[0288] It can be understood that when both the first process positioning plate 31 and the second process positioning plate 32 are spot-welded and positioned on the bottom plate 11 of the first preformed structure and the second preformed structure, the assembled structure forms a rigid structure, so that the upward deflection formed by the first preformed structure will not change due to the removal of the external force, and the upward deflection formed by the second preformed structure will not change due to the removal of the external force.

[0289] Preferably, in this embodiment, the first process plate includes a plurality of first sub-process plates. After the first process positioning plate 31 is spot-welded and positioned on the first side of the bottom plate 11 of the first preformed structure and the bottom plate 11 of the second preformed structure, the plurality of first sub-process plates are distributed at intervals along the interval direction of the two first positioners 4.

[0290] Further preferably, the plurality of first sub-process plates are divided into two groups, and along the direction from the middle to the two ends of the interval direction of the two first positioners 4, the two groups of first sub-process plates are synchronously spot-welded and positioned on the bottom plate 11 of the first preformed structure and the bottom plate 11 of the second preformed structure.

[0291] Preferably, in this embodiment, the second process plate includes a plurality of second sub-process plates. After the second process positioning plate 32 is spot-welded and positioned on the second side of the bottom plate 11 of the first preformed structure and the bottom plate 11 of the second preformed structure, the plurality of second sub-process plates are distributed at intervals along the interval direction of the two first positioners 4.

[0292] Further preferably, the multiple second sub-process plates are divided into two groups, and along the direction from the middle to both ends at the interval of the two first positioners 4, the two groups of second sub-process plates are synchronously spot-welded and positioned on the bottom plate 11 of the first preformed structure and the bottom plate 11 of the second preformed structure.

[0293] S2100. Remove the first acting force and the second acting force. At this time, the assembled structure forms a rigid structure, and the upward deflection anti-deformation prefabrication will not change due to the removal of the external force.

[0294] S2200. Seam-weld each weld seam on the outer periphery of the first preformed structure and seam-weld each weld seam on the outer periphery of the second preformed structure.

[0295] Optionally, between step S1900 and step S2000, or between step S2000 and step S2100, or between step S2100 and step S2200, the following steps are further included: controlling each rotating part 41 of the two first positioners 4 to switch to the first working state; controlling the first limiting unit 45 and the second limiting unit 46 of the two first positioners 4, so that the first limiting block 451 of each first positioner 4 and the second limiting block 461 of each first positioner 4 approach each other along the second orientation and clamp the assembled structure; controlling the third limiting unit 47 of the two first positioners 4, so that the third limiting block 471 of each first positioner 4 presses the assembled structure against the bottom wall of the synchronous group welding positioning space 411 along the height direction of the synchronous group welding positioning space 411. To fix the setting position of the assembled structure on the two first positioners 4.

[0296] In this embodiment, preferably, between step S2100 and step S2200, the following steps are included: controlling each rotating part 41 of the two first positioners 4 to switch to the first working state; controlling the first limiting unit 45 and the second limiting unit 46 of the two first positioners 4, so that the first limiting block 451 of each first positioner 4 and the second limiting block 461 of each first positioner 4 approach each other along the second orientation and clamp the assembled structure; controlling the third limiting unit 47 of the two first positioners 4, so that the third limiting block 471 of each first positioner 4 presses the assembled structure against the bottom wall of the synchronous group welding positioning space 411 along the height direction of the synchronous group welding positioning space 411.

[0297] Preferably, step S2200 includes: rotating the assembled structure so that each weld seam on the outer periphery of the first preformed structure and each weld seam on the outer periphery of the second preformed structure are sequentially oriented towards the top of the assembled structure, and seam-welding the weld seams oriented towards the top of the assembled structure.

[0298] Specifically, for the rotation assembly structure, the specific steps of making each weld seam on the outer periphery of the first preformed structure and each weld seam on the outer periphery of the second preformed structure face the top of the assembly structure in sequence and seam-welding the weld seams facing the top of the assembly structure include:

[0299] When the rotating parts 41 of the two first positioners 4 are both in the first working state, drive the rotation of each first positioner 4 around its own central axis, so that each weld seam on the outer periphery of the first preformed structure and each weld seam on the outer periphery of the second preformed structure face the top of the assembly structure in sequence, and seam-weld the weld seams facing the top of the assembly structure. Exemplarily, Figure 16 It is a schematic diagram of the weld seam formed by the first web 12 of the second preformed structure and at least two sub-cover plate parts 141 facing the top of the assembly structure.

[0300] By setting like this, each weld seam on the outer periphery of the first preformed structure is seam-welded, and each weld seam on the outer periphery of the second preformed structure is seam-welded; secondly, when the weld seams face the top of the assembly structure for seam-welding, the quality of seam-welding each weld seam on the outer periphery of the first preformed structure and each weld seam on the outer periphery of the second preformed structure can be effectively improved, thereby further improving the quality of the two formed middle beams 1.

[0301] S2300. Control the rotating parts 41 of the two first positioners 4 to switch to the second working state, and hoist the assembly structure to the expected disassembly position.

[0302] S2400. After the assembly structure is left to cool, detach the first process positioning plate 31, the second process positioning plate 32 and the first spacer 21. At this time, two middle beams 1 are formed.

[0303] Specifically, after the first process positioning plate 31 and the second process positioning plate 32 are detached, the side deflection and upward deflection of each middle beam 1 will become smaller due to the detachment of the first process positioning plate 31 and the second process positioning plate 32, so that the upward deflection of the finally formed middle beam 1 is smaller and within the allowable upward deflection range of the middle beam 1, and the side deflection of the finally formed middle beam 1 is smaller and within the allowable side deflection range of the middle beam 1. Thus, the problem of flame straightening of the formed middle beam 1 in the prior art can be effectively avoided, the problem of reduction of the structural strength of the middle beam caused by flame straightening can be effectively avoided, and the forming efficiency of the middle beam 1 can be improved.

[0304] Specifically, after two middle beams 1 are formed, grind the positions where the first process plate and the second process plate are spot-welded and positioned on each middle beam 1, and then perform other process steps such as inspecting the middle beam 1.

[0305] The following takes the first web 12 as a flat web and the second web 13 as an L-shaped web as an example to illustrate the process of welding and forming the bottom plate 11, flat web, L-shaped web, rib plate 15 and cover plate 14 of two center beams 1 by this center beam forming method.

[0306] Exemplarily, the plate thickness of the bottom plate 11 is 30 mm; the plate thickness of the flat web is 20 mm; the plate thickness of the L-shaped web is 16 mm; the plate thickness of the cover plate 14 is 30 mm; the expected length of the formed center beam 1 is 17760 mm. The distance between the outer side of the first web 12 and the end face of the bottom plate 11 close to the first web 12 is 50 mm. The distance between the outer side of the second web 13 and the end face of the bottom plate 11 close to the second web 13 is 60 mm.

[0307] Specifically, as Figures 1 - 19 shown, the process of welding and forming the bottom plate 11, flat web, L-shaped web, rib plate 15 and cover plate 14 of two center beams 1 by this center beam forming method is as follows:

[0308] The bottom plate 11 is set to be formed by three butt seam welds according to the expected length of the formed center beam 1, the first web 12 is set to be formed by three butt seam welds, and the second web 13 is set to be formed by three butt seams. The total length of the formed bottom plate 11 is greater than the expected length of the formed center beam 1, that is, process allowances are set for the bottom plate 11. The total length of the formed first web 12 is greater than the expected length of the formed center beam 1, that is, process allowances are set for the first web 12. The total length of the formed second web 13 is greater than the expected length of the formed center beam 1, that is, process allowances are set for the second web 13. Exemplarily, the process allowances of the bottom plate 11, the first web 12 and the second web 13 are all 30 mm.

[0309] Both the first web 12 and the second web 13 are spot welded and positioned on the bottom plate 11 to form a basic structure.

[0310] The basic structure is hoisted onto the brackets 91 of two second positioners 9, so that the two ends of the bottom plate 11 of the basic structure in the length direction are respectively supported on two sixth limit blocks 941 located below in the fifth orientation of the two second positioners 9; along the fifth orientation, control the two sixth limit units 94 located above in each second positioner 9, so that one of the two sixth limit blocks 941 located above in each second positioner 9 presses against the second web 13, and the other presses against the bottom plate 11; control the fourth limit unit 92 in each second positioner 9, so that the fourth limit blocks 921 in each second positioner 9 press against the second web 13 along the fourth orientation, and control the fifth limit unit 93 in each second positioner 9, so that the fifth limit blocks 931 in each second positioner 9 press against the bottom plate 11 along the fourth orientation.

[0311] Control the two second positioners 9 to drive the corresponding brackets 91 to rotate synchronously by 90° around the fixed axis in the first clockwise direction, so as to drive the basic structure to rotate synchronously by 90° around the fixed axis in the first clockwise direction, and make the first web 12 located directly below the second web 13.

[0312] Level the base platform 8, connect the two second cushion blocks 22 to the tabletop of the base platform 8, and the height of the second cushion block 22 in the height direction of the base platform 8 is 55 mm.

[0313] Control each sixth limit unit 94 in the two second positioners 9, so that a first limit avoidance gap is formed between each sixth limit block 941 in each second positioner 9 that abuts against the second web 13 and the second web 13, and a first limit avoidance gap is formed between each sixth limit block 941 in each second positioner 9 that abuts against the bottom plate 11 and the bottom plate 11. Control the fourth limit unit 92 in the two second positioners 9, so that a second limit avoidance gap is formed between the fourth limit block 921 of each second positioner 9 and the second web 13, and the second limit avoidance gap is equal to the sum of the side deflection avoidance gap and N times the misalignment gap, where N is a positive number greater than 1. The first limit avoidance gap is 3 mm. The side deflection avoidance gap is 5 mm.

[0314] Control the two second positioners 9 to drive the corresponding brackets 91 to descend synchronously along their own height directions until the first web 12 is supported on the two second cushion blocks 22, and the two second cushion blocks 22 are respectively located inside the two ends of the first web 12 in the length direction. Specifically, before performing step S320, level the base platform 8 in advance, and connect the two second cushion blocks 22 to the tabletop of the base platform 8 in advance.

[0315] Apply a fourth acting force from top to bottom in the height direction of the base platform 8 to the middle area in the length direction of the basic structure, so that the middle area in the length direction of the basic structure is bent downward into a third arc shape, and the center of the third arc shape is far from the first web 12 relative to the second web 13. When the middle area in the length direction of the basic structure abuts against the tabletop of the base platform 8 in the height direction of the base platform 8, the chord height of the third arc shape is the third preset chord height, and the third preset chord height is 5 mm.

[0316] Divide the multiple rib plates 15 into two first sub-rib plate groups and two second sub-rib plate groups. Along the direction from the middle to the two ends of the arc extension direction of the first web 12, synchronously seam-weld the first sub-rib plates 151 of the two first sub-rib plate groups to the first web 12, and make the first sub-rib plates 151 of the two first sub-rib plate groups be spaced apart along the arc extension direction of the first web 12. Along the direction from the middle to the two ends of the arc extension direction of the first web 12, synchronously seam-weld the second sub-rib plates 152 of the two second sub-rib plate groups to the first web 12, and arrange a second sub-rib plate 152 between any two adjacent first sub-rib plates 151.

[0317] Remove the fourth force.

[0318] Control the two second positioners 9 to drive the corresponding brackets 91 to synchronously rise along their own height directions, and fix the relative positions of the two ends of the arc extension direction of the foundation structure and the brackets 91 of the two second positioners 9 one by one.

[0319] Control the two second positioners 9 to drive the corresponding brackets 91 to synchronously rotate 180° around a fixed axis in the second clockwise direction, so as to drive the foundation structure to synchronously rotate 180° around the fixed axis in the second clockwise direction, so that the second web 13 is located directly below the first web 12. The first clockwise direction and the second clockwise direction are opposite clockwise directions.

[0320] Detach the two second pads 22, and connect a third pad 23 to the tabletop of the base 8. The height of the third pad 23 along the height direction of the base 8 is 65 mm.

[0321] Control each sixth limit unit 94 in the two second positioners 9, so that a first limit avoidance gap is formed between each sixth limit block 941 in each second positioner 9 that abuts against the second web 13 and the second web 13, and a first limit avoidance gap is formed between each sixth limit block 941 in each second positioner 9 that abuts against the bottom plate 11 and the bottom plate 11. Control the fifth limit unit 93 in the two second positioners 9, so that a second limit avoidance gap is formed between each fifth limit block 931 in each second positioner 9 and the bottom plate 11. The first limit avoidance gap is 3 mm. The side deflection avoidance gap is 5 mm.

[0322] Control the two second positioners 9 to drive the corresponding brackets 91 to synchronously descend along their own height directions until the second web 13 is supported on a third pad 23, and a third pad 23 is located in the middle area of the arc extension direction of the second web 13. Specifically, before performing step S720, detach the two second pads 22 in advance, and connect a third pad 23 to the tabletop of the base 8.

[0323] Apply a fifth force simultaneously to the areas near both ends of the arc extension direction of the foundation structure from top to bottom along the height direction of the base 8, so that the areas near both ends of the arc extension direction of the foundation structure are synchronously bent downward into a third arc shape, and the center of the third arc shape is relatively far from the first web 12 with respect to the second web 13. When both ends of the arc extension direction of the foundation structure abut against the tabletop of the base 8 along the height direction of the base 8, the chord height of the third arc shape is the third preset chord height, and the third preset chord height is 5 mm.

[0324] Weld the first sub-rib plates 151 of the two first sub-rib plate groups to the second web 13 along the extending direction of the arc of the second web 13 from the middle to both ends, and weld the second sub-rib plates 152 of the two second sub-rib plate groups to the second web 13.

[0325] Remove the fifth acting force.

[0326] Control the two second positioners 9 to drive the corresponding brackets 91 to synchronously rise along their own height directions, and fix the relative positions of the two ends in the extending direction of the arc of the basic structure and the brackets 91 of the two second positioners 9 one by one. Control the two second positioners 9 to drive the corresponding brackets 91 to synchronously rotate 90° along the first clockwise direction around a fixed axis, so as to drive the basic structure to synchronously rotate 90° along the first clockwise direction around the fixed axis, so that the bottom plate 11 is located directly below the first web 12 and the second web 13.

[0327] Detach one third cushion block 23 and connect one fourth cushion block 24 to the tabletop of the base 8. The height of the fourth cushion block 24 along the height direction of the base 8 is 50 mm.

[0328] Control the fourth limit units 92 in the two second positioners 9 to make the fourth limit blocks 921 of each second positioner 9 move away from the second web 13; control the fifth limit units 93 in the two second positioners 9 to make the fifth limit blocks 931 in each second positioner 9 move away from the bottom plate 11; control the respective sixth limit units 94 in the two second positioners 9 to make the respective sixth limit blocks 941 in each second positioner 9 move away from the basic structure.

[0329] Control the two second positioners 9 to drive the corresponding brackets 91 to synchronously descend along their own height directions until the bottom plate 11 of the basic structure is supported on one fourth cushion block 24, and one fourth cushion block 24 is located in the middle area in the extending direction of the arc of the bottom plate 11.

[0330] Apply a third acting force simultaneously to the areas near both ends in the extending direction of the arc of the basic structure from top to bottom along the height direction of the base 8, so that the areas near both ends in the extending direction of the arc of the basic structure are synchronously bent downward into a second arc shape, and the center of the second arc shape is far from the first web 12 and the second web 13 relative to the bottom plate 11 of the basic structure. When both ends in the extending direction of the arc of the basic structure abut against the tabletop of the base 8 along the height direction of the base 8, the chord height of the second arc shape is the second preset chord height, and the second preset chord height is 50 mm.

[0331] Sew the rib plate 15 to the bottom plate 11 by seam welding; sew the inner side of the first web plate 12 to the bottom plate 11 by seam welding; sew the inner side of the second web plate 13 to the bottom plate 11 by seam welding. Specifically, along the direction from the middle to both ends of the arc extension direction of the bottom plate 11, divide the multiple rib plates 15 into two groups, and synchronously sew the two groups of rib plates 15 to the bottom plate 11. Along the direction from the middle to both ends of the arc extension direction of the bottom plate 11, divide the first web plate 12 into two parts, and synchronously sew the two parts of the first web plate 12 to the bottom plate 11. Along the direction from the middle to both ends of the arc extension direction of the bottom plate 11, divide the second web plate 13 into two parts, and synchronously sew the two parts of the second web plate 13 to the bottom plate 11.

[0332] The cover plate 14 is provided to include at least two sub-cover plate parts 141. Position the relative positions of the first web plate 12, the second web plate 13, and the at least two sub-cover plate parts 141, so that the at least two sub-cover plate parts 141 are arranged in sequence along the arc extension direction of the first web plate 12 and the second web plate 13, and along the direction perpendicular to the first web plate 12 and the second web plate 13, the first ends of the end faces close to each other on any two adjacent sub-cover plate parts 141 contact the second web plate 13 at the first position 142. Spot-weld the positioned at least two sub-cover plate parts 141 to the first web plate 12 and the second web plate 13.

[0333] Remove the third acting force. Specifically, synchronously use two preformed structure auxiliary forming devices to assist in forming the first preformed structure and the second preformed structure. At this step, the first preformed structure and the second preformed structure are formed synchronously.

[0334] Control the two second positioners 9 to drive the corresponding brackets 91 to synchronously rise along their own height directions, and fix the relative positions of the two ends of the arc extension direction of the first preformed structure and the brackets 91 of the two second positioners 9 one by one.

[0335] Control the two second positioners 9 to drive the corresponding brackets 91 to synchronously rotate 180° around a fixed axis in the first clockwise direction or the second clockwise direction, drive the first preformed structure to synchronously rotate 180° around the fixed axis, so that the bottom plate 11 of the first preformed structure is located directly above the first web plate 12 and the second web plate 13.

[0336] Along the fifth orientation, control the two upper sixth limit units 94 in each second positioner 9 to move away from the first preformed structure; control the fourth limit unit 92 in each second positioner 9, so that the fourth limit blocks 921 in each second positioner 9 move away from the second web plate 13 along the fourth orientation; control the fifth limit unit 93 in each second positioner 9, so that the fifth limit blocks 931 in each second positioner 9 move away from the bottom plate 11 along the fourth orientation. Facilitate the subsequent transfer of the first preformed structure to the two first positioners 4.

[0337] Lift the first preformed structure to the two first positioners 4, so that the two ends of the first preformed structure in the arc extension direction are respectively supported in the synchronous group welding positioning spaces 411 of the two first positioners 4 to reach the preset synchronous group welding position. During this process, keep the bottom plate 11 of the first preformed structure directly above the first web 12 and the second web 13.

[0338] Use a first force application unit 5. Pass one hook 511 of the lever hoist 51 around the top of the first preformed structure, so that the chain 512 of the lever hoist 51 passes around the top of the first preformed structure; hang the two hooks 511 of the lever hoist 51 on the corresponding two connecting rings 52 one by one; move the lever hoist 51 to the middle area in the arc extension direction of the first preformed structure; tighten the chain 512, and the chain 512 applies a first force to the top of the middle area in the arc extension direction of the first preformed structure from top to bottom until the first preformed structure is deformed into a first arc shape, and the first preset chord height is 25 mm.

[0339] Arrange a plurality of first cushion blocks 21 on top of the bottom plate 11 of the first preformed structure. It can be understood that when the number of the first cushion blocks 21 is one, the maximum height of the first cushion block 21 is 50 mm; when the number of the first cushion blocks 21 is multiple, the maximum height of the one with the largest height among the multiple first cushion blocks 21 is 50 mm.

[0340] Lift the second preformed structure to the two first positioners 4. During this process, keep the bottom plate 11 of the second preformed structure directly below the first web 12 and the second web 13; stack the bottom plate 11 of the second preformed structure on top of the first cushion blocks 21.

[0341] Pass one hook 511 of the lever hoist 51 of the two first force application units 5 around the top of the second preformed structure, so that the chain 512 of each lever hoist 51 passes around the top of the second preformed structure; hang the two hooks 511 of each lever hoist 51 on the corresponding two connecting rings 52 one by one; move one lever hoist 51 to one end in the arc extension direction of the second preformed structure, and move the other lever hoist 51 to the other end in the arc extension direction of the second preformed structure; tighten the chains 512 of the two lever hoists 51, and the chains 512 of the two lever hoists 51 apply a second force synchronously to the tops of the two ends in the arc extension direction of the second preformed structure from top to bottom one by one until the second preformed structure is deformed into a first arc shape.

[0342] Along the interval direction of the first web 12 and the second web 13, spot-weld the first process positioning plate 31 to the first side of the bottom plate 11 of the first preformed structure and the bottom plate of the second preformed structure, and spot-weld the second process positioning plate 32 to the second side of the bottom plate 11 of the first preformed structure and the bottom plate 11 of the second preformed structure to fix the relative positions of the first preformed structure, the second preformed structure and the first spacer 21, thus forming an assembled structure.

[0343] Remove the first acting force and the second acting force.

[0344] Control each rotating part 41 of the two first positioners 4 to switch to the first working state; control the first limiting unit 45 and the second limiting unit 46 of the two first positioners 4, so that the first limiting block 451 of each first positioner 4 and the second limiting block 461 of each first positioner 4 approach each other along the second orientation to clamp the assembled structure; control the third limiting unit 47 of the two first positioners 4, so that the third limiting block 471 of each first positioner 4 presses the assembled structure against the bottom wall of the synchronous group welding positioning space 411 along the height direction of the synchronous group welding positioning space 411.

[0345] When the rotating parts 41 of the two first positioners 4 are both in the first working state, drive the rotation of each first positioner 4 around its own central axis, so that each weld seam on the outer periphery of the first preformed structure and each weld seam on the outer periphery of the second preformed structure are successively oriented towards the top of the assembled structure, and seam-weld the weld seams oriented towards the top of the assembled structure.

[0346] Control the rotating parts 41 of the two first positioners 4 to switch to the second working state, and hoist the assembled structure to the expected disassembly position.

[0347] After the assembled structure is left to cool, detach both the first process positioning plate 31, the second process positioning plate 32 and the first spacer 21. Two middle beams 1 are formed.

[0348] After forming the two middle beams 1, grind the positions where the first process plate and the second process plate are spot-welded and positioned on each middle beam 1, and then perform other process steps such as inspecting the middle beam 1.

[0349] Thus, by using this middle beam forming method to synchronously group-weld and form the bottom plate 11, the cover plate 14, the rib plate 15, the first web 12 and the second web 13 of the two middle beams 1, it is possible to effectively avoid the problems of complex deformation and large deformation amount after the middle beam 1 is welded and formed, and there is no need to perform flame straightening on the formed middle beam 1, which can effectively improve the quality and efficiency of the formed middle beam 1.

[0350] Obviously, the above-mentioned embodiments of the present invention are merely examples for clearly illustrating the present invention, rather than limitations on the implementation manners of the present invention. For those of ordinary skill in the art, various obvious changes, re-adjustments and substitutions can be made without departing from the protection scope of the present invention. It is not necessary and impossible to enumerate all the implementation manners here. Any modifications, equivalent substitutions and improvements made within the spirit and principle of the present invention shall be included in the protection scope of the claims of the present invention.

Claims

1. A method for forming a center beam, which is used to synchronously group-weld and form two center beams (1); characterized in that, Including: Before seam - welding the inner sides close to each other on the first web (12) and the second web (13) of each of the middle beams (1) to the corresponding bottom plate (11), and spot - welding each cover plate (14) of each middle beam (1) to the corresponding first web (12) and second web (13) to form the first pre - formed structure and the second pre - formed structure: Moving the first pre - formed structure to a preset synchronous group - welding position, and making the bottom plate (11) of the first pre - formed structure located directly above the first web (12) and the second web (13); Applying a first acting force to the first pre - formed structure to deform the first pre - formed structure into a first arc shape, the center of the first arc shape is far from the first web (12) and the second web (13) relative to the bottom plate (11) of the first pre - formed structure, and the chord height of the first arc shape is a first preset chord height; the first preset chord height is less than the limit upward deflection chord height; Arranging a first cushion block (21) above the top of the bottom plate (11) of the first pre - formed structure; Moving the second pre - formed structure to the preset synchronous group - welding position, and making the bottom plate (11) of the second pre - formed structure stacked above the top of the first cushion block (21); Applying a second acting force to the second pre - formed structure to deform the second pre - formed structure into the first arc shape, and the arc openings of the first pre - formed structure and the second pre - formed structure are opposite; Along the interval direction of the first web (12) and the second web (13), spot - welding a first process positioning plate (31) to the first side of the bottom plate (11) of the first pre - formed structure and the bottom plate (11) of the second pre - formed structure, and spot - welding a second process positioning plate (32) to the second side of the bottom plate (11) of the first pre - formed structure and the bottom plate (11) of the second pre - formed structure to fix the relative positions of the first pre - formed structure, the second pre - formed structure and the first cushion block (21) to form an assembled structure; Removing the first acting force and the second acting force; Seam - welding each weld seam on the outer periphery of the first pre - formed structure, and seam - welding each weld seam on the outer periphery of the second pre - formed structure.

2. The method for forming a middle beam according to claim 1, characterized in that After seam - welding each weld seam on the outer periphery of the first pre - formed structure and seam - welding each weld seam on the outer periphery of the second pre - formed structure, the following steps are further included: After the assembled structure is left to cool, detaching the first process positioning plate (31), the second process positioning plate (32) and the first cushion block (21).

3. The middle beam forming method according to claim 1, wherein: Before seam - welding the inner sides close to each other on the first web (12) and the second web (13) of each middle beam (1) to the corresponding bottom plate (11), the following steps are further included: Rotating the basic structure to make the bottom plate (11) of the basic structure located directly below the corresponding first web (12) and second web (13); wherein, the basic structure is formed by spot - welding the first web (12) and the second web (13) of the middle beam (1) to the bottom plate (11). Applying a third force to the base structure deforms the base structure into a second arc shape, the center of the second arc shape is away from the first web (12) and the second web (13) relative to the bottom plate (11) of the base structure, and the chord height of the second arc shape is a second preset chord height; the second preset chord height is greater than the first preset chord height and less than the limit upward deflection chord height; After spot-welding the cover plate (14) of each of the middle beams (1) to the corresponding first web (12) and second web (13): Removing the third force forms the first preformed structure and the second preformed structure.

4. The method for forming the middle beam according to claim 3, wherein Before rotating the base structure so that the bottom plate (11) of the base structure is located directly below the corresponding first web (12) and second web (13), the following steps are further included: Rotating the base structure so that the first web (12) is located directly below the second web (13); Applying a fourth force to the base structure deforms the base structure into a third arc shape, the center of the third arc shape is away from the first web (12) relative to the second web (13), and the chord height of the third arc shape is a third preset chord height; the third preset chord height is less than the limit lateral deflection chord height.

5. The method for forming the middle beam according to claim 4, characterized in that The middle beam (1) further includes stiffening plates (15); after the base structure is deformed into the third arc shape, the following steps are further included: Seam-welding a plurality of the stiffening plates (15) to the inner side of the first web (12) so that the plurality of stiffening plates (15) are distributed at intervals along the arc extension direction of the first web (12); Removing the fourth force; Rotating the base structure so that the second web (13) is located directly below the first web (12); Applying a fifth force to the base structure deforms the base structure into the third arc shape; Seam-welding a plurality of the stiffening plates (15) to the inner side of the second web (13); Removing the fifth force.

6. The method for forming a middle beam according to any one of claims 1-5, characterized in that The specific steps of spot-welding the cover plate (14) of the middle beam (1) to the first web (12) and the second web (13) include: Setting the cover plate (14) to include at least two sub-cover plate parts (141); Positioning the relative positions of the first web (12), the second web (13) and at least two of the sub-cover plate parts (141) so that the at least two sub-cover plate parts (141) are arranged in sequence along the arc extension direction of the first web (12) and the second web (13), and making the first ends of the adjacent end faces of any two of the sub-cover plate parts (141) in the direction perpendicular to the first web (12) and the second web (13) contact the second web (13) at the first position (142); Spot-welding the positioned at least two sub-cover plate parts (141) to the first web (12) and the second web (13); When the number of the sub-cover plate parts (141) is two, the first position (142) is located at the middle position in the arc extension direction of the second web (13); when the number of the sub-cover plate parts (141) is greater than or equal to 3, the first positions (142) are spaced apart along the arc extension direction of the second web (13).

7. The method for forming the middle beam according to any one of claims 1-5, characterized in that, The specific steps of seam welding each weld seam on the outer periphery of the first preformed structure and each weld seam on the outer periphery of the second preformed structure include: Rotate the assembled structure to make each weld seam on the outer periphery of the first preformed structure and each weld seam on the outer periphery of the second preformed structure face the top of the assembled structure in sequence, and seam weld the weld seams facing the top of the assembled structure.

8. The method for forming the middle beam according to claim 7, characterized in that, The auxiliary device for forming the middle beam includes two first positioners (4), the first positioner (4) includes at least two rotating parts (41), and at least two of the rotating parts (41) have a first working state and a second working state; when at least two of the rotating parts (41) are in the first working state, the outer periphery of at least two of the rotating parts (41) is arranged as a rotating ring, and the inner periphery of at least two of the rotating parts (41) is arranged as a synchronous group welding positioning space (411) that penetrates axially, and the rotating ring can rotate around its own central axis; when at least two of the rotating parts (41) are in the second working state, the synchronous group welding positioning space (411) is opened, and the middle beam (1) can enter and exit the synchronous group welding positioning space (411) and can be supported within the synchronous group welding positioning space (411). The specific steps of moving the first preformed structure to a preset synchronous group welding position include: Lift and install the first preformed structure onto the two first positioners (4), so that the two ends of the first preformed structure in the arc extension direction are respectively supported within the synchronous group welding positioning spaces (411) of the two first positioners (4) to reach the preset synchronous group welding position. The specific steps of rotating the assembled structure to make each weld seam on the outer periphery of the first preformed structure and each weld seam on the outer periphery of the second preformed structure face the top of the assembled structure in sequence, and seam welding the weld seams facing the top of the assembled structure include: When the rotating parts (41) of the two first positioners (4) are both in the first working state, drive the rotating ring of each first positioner (4) to rotate around its own central axis, so that each weld seam on the outer periphery of the first preformed structure and each weld seam on the outer periphery of the second preformed structure face the top of the assembled structure in sequence, and seam weld the weld seams facing the top of the assembled structure.

9. The middle beam includes a bottom plate (11), a first web (12), a second web (13) and a cover plate (14), and is characterized in that, Form the bottom plate (11), the first web (12), the second web (13) and the cover plate (14) into a middle beam (1) by using the middle beam forming method according to any one of claims 1-8.

10. The center beam according to claim 9, characterized in that, The first web (12) is a flat web, the second web (13) is an L-shaped web, and the plate thickness of the first web (12) is greater than the plate thickness of the second web (13).

11. Auxiliary device for forming the middle beam, characterized in that, For implementing the center beam forming method according to any one of claims 1-8, the center beam forming auxiliary device includes: A cushion block, including a first cushion block (21) for being clamped between the bottom plates (11) of two said center beams (1); A first process positioning plate (31) and a second process positioning plate (32) for fixing the relative positions of the bottom plates (11) of two said center beams (1); A welding unit for spot welding the first web (12) and the second web (13) of each said center beam (1) to the corresponding bottom plate (11), spot welding the cover plate (14) of each said center beam (1) to the corresponding first web (12) and second web (13), spot welding the first process positioning plate (31) to the bottom plates (11) of two said center beams (1), spot welding the second process positioning plate (32) to the bottom plates (11) of two said center beams (1), seam welding each weld on the outer periphery of the first preformed structure, and seam welding each weld on the outer periphery of the second preformed structure; Two first force application units (5) for applying forces to the first preformed structure and the second preformed structure.

12. The auxiliary device for forming the middle beam according to claim 11, wherein The center beam forming auxiliary device further includes two first positioners (4); the first positioner (4) includes: At least two rotating parts (41), and at least two said rotating parts (41) have a first working state and a second working state; when at least two said rotating parts (41) are in the first working state, the outer periphery of at least two said rotating parts (41) is arranged as a rotating ring, the inner periphery of at least two said rotating parts (41) is arranged as an axially penetrating synchronous group welding positioning space (411), and the rotating ring can rotate around its own central axis; when at least two said rotating parts (41) are in the second working state, the synchronous group welding positioning space (411) is opened, and the center beam (1) can enter and exit the synchronous group welding positioning space (411) and can be supported within the synchronous group welding positioning space (411).

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