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. According to the center sill forming method, after a first web plate and a second web plate are positioned on a bottom plate through spot welding to form a foundation structure, the foundation structure is rotated to enable the first web plate to be located under the second web plate; first acting force is applied to the foundation structure to deform the foundation structure into a first arc shape, the circle center of the first arc shape is far away from the first web relative to the second web, and the chord height of the first arc shape is the first preset chord height. After the at least two sub cover plate parts are positioned on the first web plate and the second web plate in a spot welding mode, the at least two sub cover plate parts are welded to the second web plate in a seam welding mode in the direction from the middle to the two ends in the arc extending direction of the second web plate, and the at least two sub cover plate parts are welded to the first web plate in a seam welding mode. The problems that after the middle beam is welded and formed, deformation is complex, and the deformation amount is large can be solved, flame correction does not need to be conducted on the formed middle beam, and the middle beam forming efficiency is high, quality is good, safety is high, and cost is low.

Description

Technical Field

[0001] The present invention relates to the technical field of center sill forming, and particularly 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 forming 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 type structures, 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 assembly welding a bottom plate, two webs, a cover plate, and several stiffeners to form a box girder type 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. However, especially for the cases where the thickness and / or shape of the two webs are different, after the center sill is welded and formed, each weld formed on the first web and each weld formed on the second web are at least partially asymmetrically distributed. Therefore, if the center sill is assembled and welded into shape by using the above-mentioned assembly welding forming method in the prior art, the formed center sill will have complex deformation and a large amount of deformation, resulting in the necessity of flame straightening the center sill in the later stage, and the difficulty of flame straightening is large, the time is long, and the structural strength of the center sill is easily reduced. 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, the center sill includes a bottom plate, a first web, a second web, and a cover plate, and the shape and / or plate thickness of the first web and the second web are different; the center sill forming method includes:

[0007] After spot welding and positioning both the first web and the second web on the bottom plate to form a basic structure:

[0008] Rotating the basic structure so that the first web is directly below the second web;

[0009] Applying a first acting force to the basic structure to deform the basic structure into a first arc shape, the center of the first arc shape is relatively far from the first web with respect to the second web, 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 side deflection chord height;

[0010] Set the cover plate to include at least two sub - cover plate parts, and after spot - welding and positioning all of the at least two sub - cover plate parts on the first web and the second web:

[0011] Sew - weld all of the at least two sub - cover plate parts on the second web along the direction from the middle to both ends along the arc extension direction of the second web;

[0012] Sew - weld all of the at least two sub - cover plate parts on the first web along the direction from the middle to both ends along the arc extension direction of the second web.

[0013] As a preferred scheme of the above - mentioned central beam forming method, the central beam further includes a plurality of stiffening plates; after the basic structure is deformed into the first arc shape and before spot - welding and positioning all of the at least two sub - cover plate parts on the first web and the second web, the following steps are further included:

[0014] Sew - weld all of the plurality of stiffening plates on the inner side of the first web, so that the plurality of stiffening plates are spaced apart along the arc extension direction of the first web;

[0015] Remove the first acting force;

[0016] Rotate the basic structure so that the second web is directly below the first web;

[0017] Apply a second acting force to the basic structure to deform the basic structure into the first arc shape;

[0018] Sew - weld all of the plurality of stiffening plates on the inner side of the second web;

[0019] Remove the second acting force;

[0020] Wherein, the inner side of the first web is the side of the first web close to the second web; the inner side of the second web is the side of the second web close to the first web.

[0021] As a preferred scheme of the above - mentioned central beam forming method, after removing the second acting force, the following steps are further included:

[0022] Rotate the basic structure so that the bottom plate is directly below the first web and the second web;

[0023] Apply a third acting 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, and the chord height of the second arc shape is a second preset chord height; the second preset chord height is less than the limit upward - deflection chord height;

[0024] Seam-weld the rib plate to the bottom plate; seam-weld the inner side of the first web to the bottom plate; seam-weld the inner side of the second web to the bottom plate.

[0025] As a preferred embodiment of the above middle beam forming method, after positioning at least two of the sub-cover plate parts by spot welding on the first web and the second web, and along the direction of the arc extension of the second web from the middle to both ends, before seam-welding at least two of the sub-cover plate parts to the second web, the following steps are further included:

[0026] Maintain the third acting force, seam-weld the outer side of the first web to the bottom plate, and seam-weld the outer side of the second web to the bottom plate;

[0027] Wherein, the outer side of the first web is the side of the first web away from the second web, and the outer side of the second web is the side of the second web away from the first web.

[0028] As a preferred embodiment of the above middle beam forming method, after seam-welding at least two of the sub-cover plate parts to the second web, and before seam-welding at least two of the sub-cover plate parts to the first web, the following steps are further included:

[0029] Let the overall structure composed of the basic structure, rib plate and cover plate stand still for cooling;

[0030] Remove the third acting force.

[0031] As a preferred embodiment of the above middle beam forming method, the specific steps of seam-welding a plurality of the rib plates to the inner side of the first web so that the plurality of rib plates are spaced apart along the arc extension direction of the first web include:

[0032] Divide the plurality of rib plates into two first sub-rib plate groups and two second sub-rib plate groups;

[0033] Along the direction of the arc extension of the first web from the middle to both ends, synchronously seam-weld the first sub-rib plates of the two first sub-rib plate groups to the first web, and make the first sub-rib plates of the two first sub-rib plate groups be spaced apart along the arc extension direction of the first web;

[0034] Along the direction of the arc extension of the first web from the middle to both ends, synchronously seam-weld the second sub-rib plates of the two second sub-rib plate groups to the first web, and arrange one of the second sub-rib plates between any two adjacent first sub-rib plates.

[0035] As a preferred embodiment of the above middle beam forming method, the specific steps of positioning at least two of the sub-cover plate parts by spot welding on the first web and the second web include:

[0036] Locate the relative positions of the first web, the second web and at least two of the sub-cover plate parts, such that at least two of the sub-cover plate parts 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 parts that face each other come into contact with the second web at a first position;

[0037] Spot-weld all of the at least two located sub-cover plate parts to the first web and the second web;

[0038] Wherein, when the number of the sub-cover plate parts 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 parts is greater than or equal to three, the respective first positions are spaced apart along the arc extension direction of the second web.

[0039] As a preferred embodiment of the above middle beam forming method, when seam-welding all of the at least two sub-cover plate parts to the second web, rotate the basic structure such that the weld seam formed between the second web and the at least two sub-cover plate parts faces the top of the basic structure; and / or,

[0040] When seam-welding all of the at least two sub-cover plate parts to the first web, rotate the basic structure such that the weld seam formed between the first web and the at least two sub-cover plate parts faces the top of the basic structure.

[0041] As a preferred embodiment of the above middle beam forming method, the middle beam forming auxiliary device includes two positioners, and each positioner is provided with a support plate; the positioner can drive the support plate to rotate around a fixed axis, and the support plate is used to fix the installation position of the basic structure; the specific steps of rotating the basic structure such that the first web is located directly below the second web include:

[0042] Lift and install the basic structure onto the support plates of the two positioners, and fix the relative positions of the two ends in the length direction of the basic structure and the support plates of the two positioners in a one-to-one correspondence;

[0043] Control the two positioners to drive the corresponding support plates to rotate synchronously around the fixed axis, so as to drive the basic structure to rotate synchronously around the fixed axis until the first web is located directly below the second web.

[0044] As a preferred solution of the above middle beam forming method, the middle beam forming auxiliary device further includes a base and a cushion block. The two positioners are arranged at intervals on both sides of the length direction of the base. The positioner can also drive the pallet to lift along its own height direction. The height direction of the positioner is parallel to the height direction of the base. The cushion block includes a first cushion block, and the first cushion block is detachably connected to the tabletop of the base. The specific steps of applying a first force to the basic structure to deform the basic structure into a first arc shape with the center of the first arc shape being farther from the first web relative to the second web include:

[0045] Control the two positioners to drive the corresponding pallets to synchronously descend along their own height directions until the first web is supported on the two first cushion blocks, and the two first cushion blocks are respectively located inside the two ends of the first web in the length direction;

[0046] Apply the first force to the middle area in the length direction of the basic structure from top to bottom along the height direction of the base, so that the middle area in the length direction of the basic structure is bent downward to form the first arc shape, and the center of the first arc shape is farther from the first web relative to the second web.

[0047] As a preferred solution of the above middle beam forming method, along the height direction of the base, the maximum height of the first cushion block is equal to the first preset chord height;

[0048] When the middle area in the length direction of the basic structure abuts against the tabletop of the base along the height direction of the base, the chord height of the first arc shape is the first preset chord height.

[0049] The middle beam includes a bottom plate, a first web, a second web and a cover plate. The shapes and / or plate thicknesses of the first web and the second web are different, and the bottom plate, the first web, the second web and the cover plate are formed into a middle beam by using the above middle beam forming method.

[0050] 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.

[0051] The middle beam forming auxiliary device is used to implement the above middle beam forming method. The middle beam forming auxiliary device includes:

[0052] Two positioners, each positioner is provided with a pallet; the positioner can drive the pallet to rotate around a fixed axis, and the pallet is used to fix the installation position of the basic structure;

[0053] A force application unit for applying a force to the basic structure;

[0054] A welding unit for spot welding the first web and the second web to the base plate respectively, spot welding at least two sub-cover plate parts to the first web and the second web respectively, seam welding the sub-cover plate parts to the second web, and seam welding the sub-cover plate parts to the first web.

[0055] As a preferred solution of the above middle beam forming auxiliary device, the pallet is provided with at least one first limiting unit and at least two second limiting units. At least one first limiting unit can limit the basic structure on the plate surface of the pallet along a first direction, and at least two second limiting units can limit the basic structure on the plate surface of the pallet along a second direction. The first direction is perpendicular to the plate surface of the pallet, and the second direction is perpendicular to the spacing direction of the two positioners and perpendicular to the first direction.

[0056] Advantages of the present invention:

[0057] The present invention provides a middle beam forming method, a middle beam and a middle beam forming auxiliary device. Among them, in the middle beam forming method, after spot welding the first web and the second web to the base plate respectively to form a basic structure: rotate the basic structure so that the first web is directly below the second web; apply a first acting force to the basic structure to deform the basic structure into a first arc shape, the center of the first arc shape is far from the first web relative to the second web, and the chord height of the first arc shape is a first preset chord height, and the first preset chord height is less than the limit side deflection chord height. Set the cover plate to include at least two sub-cover plate parts, and after spot welding at least two sub-cover plate parts to the first web and the second web respectively: along the direction from the middle to both ends of the arc extension direction of the second web, seam weld at least two sub-cover plate parts to the second web; along the direction from the middle to both ends of the arc extension direction of the second web, seam weld at least two sub-cover plate parts to the first web.

[0058] By forming the base plate, the cover plate, the first web and the second web into a middle beam through the middle beam forming method, it 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, which can effectively improve the efficiency, quality and safety of the formed middle beam, and can effectively reduce the cost of the formed middle beam. Description of the drawings

[0059] Figure 1 is a longitudinal sectional view of the middle beam provided by the specific embodiment of the present invention Figure 1 ;

[0060] Figure 2 is a longitudinal sectional view of the middle beam provided by the specific embodiment of the present invention Figure 2 ;

[0061] Figure 3The assembly of the middle beam and the auxiliary device for forming the middle beam provided by the specific embodiment of the present invention Figure 1 ;

[0062] Figure 4 The assembly of the middle beam and the auxiliary device for forming the middle beam provided by the specific embodiment of the present invention Figure 2 ;

[0063] Figure 5 Schematic diagram of the overall structure composed of the rib plate and the basic structure supported on two first cushion blocks provided by the specific embodiment of the present invention;

[0064] Figure 6 Schematic diagram of the overall structure composed of the rib plate and the basic structure supported on a second cushion block provided by the specific embodiment of the present invention;

[0065] Figure 7 Schematic diagram of the overall structure composed of the rib plate and the basic structure supported on a third cushion block provided by the specific embodiment of the present invention;

[0066] Figure 8 Schematic diagram of the structure in which both sub-cover plate parts are spot-welded and positioned on the overall structure composed of the rib plate and the basic structure provided by the specific embodiment of the present invention;

[0067] Figure 9 Cross-sectional view of the middle beam when the weld formed by the first web and at least two sub-cover plate parts faces the top of the basic structure provided by the specific embodiment of the present invention;

[0068] Figure 10 Flow chart of the middle beam forming method provided by the specific embodiment of the present invention Figure 1 ;

[0069] Figure 11 Flow chart of the middle beam forming method provided by the specific embodiment of the present invention Figure 2 .

[0070] In the figure:

[0071] 1. Middle 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 clearance; 15. Rib plate; 151. First sub-rib plate; 152. Second sub-rib plate;

[0072] 2. Positioner;

[0073] 3. Support plate;

[0074] 4. Base;

[0075] 51. First cushion block; 52. Second cushion block; 53. Third cushion block;

[0076] 6. First sub-limiting unit; 61. First sliding arm; 62. First locking member; 63. First lead screw; 64. First limiting block;

[0077] 7. Second sub-limiting unit; 71. Second sliding arm; 72. Second locking member; 73. Second lead screw; 74. Second limiting block;

[0078] 8. Third sub-limiting unit; 81. Third lead screw; 82. Third limiting block;

[0079] 9. Fourth sub-limiting unit; 91. Fourth lead screw; 92. Fourth limiting block;

[0080] 101. First mounting seat; 102. Second mounting seat. Detailed implementation manners

[0081] The present invention will be further described in detail below with reference to the 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. Additionally, it should be noted that for the sake of description, only parts related to the present invention rather than all structures are shown in the drawings.

[0082] In the description of the present invention, unless otherwise clearly defined and limited, the terms "connected", "connected to", 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 communication of two elements or the interaction relationship between two elements. 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.

[0083] In the present invention, unless otherwise clearly defined and limited, the first feature being "above" or "below" the second feature may include the 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 over", and "on the top of" the second feature includes the first feature being directly above and obliquely above the second feature, or simply indicating that the horizontal height of the first feature is higher than that of the second feature. The first feature being "below", "below and under", and "under the bottom of" the second feature includes the first feature being directly below and obliquely below the second feature, or simply indicating that the horizontal height of the first feature is lower than that of the second feature.

[0084] In the description of this embodiment, the orientation or positional relationships such as "upper", "lower", "right", etc. are based on the orientation or positional relationships shown in the drawings. It is 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. Therefore, it should not be construed as a limitation to the present invention. In addition, the terms "first" and "second" are only used for distinction in description and have no special meaning.

[0085] Embodiment 1

[0086] As Figure 1 and Figure 2 shown, this embodiment provides a center beam 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 beam 1. Specifically, the cross-sectional shape of the center beam 1 along the length direction is approximately rectangular, making the formed center beam 1 a box girder structure.

[0087] Specifically, the shapes and thicknesses of the first web 12 and the second web 13 can be adaptively set according to the actual working conditions. That is, the shapes of the first web 12 and the second web 13 are different and the thicknesses are different, or the shapes of the first web 12 and the second web 13 are different but the thicknesses are the same, or the shapes of the first web 12 and the second web 13 are the same but the thicknesses are different, or the shapes and thicknesses of the first web 12 and the second web 13 are the same.

[0088] In this embodiment, as Figure 1 and Figure 2 shown, exemplarily, the first web 12 is set as a flat web, the second web 13 is set as an L-shaped web, and the thickness of the first web 12 is greater than that of the second web 13. The center beam 1 formed by using the flat web and the L-shaped web is especially suitable for new energy locomotives.

[0089] Optionally, as Figure 1 and Figure 2 shown, the center beam 1 further includes a rib plate 15. The rib plate 15 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 beam 1 can be improved.

[0090] Embodiment 2

[0091] This embodiment provides an auxiliary device for forming the center beam. As Figure 3 and Figure 4As shown, the auxiliary device for forming the center beam includes a base 4, cushion blocks, a force application unit, a welding unit, and two positioners 2. The auxiliary device for forming the center beam is used to assist in welding the bottom plate 11, the first web 12, the second web 13, the cover plate 14, and the rib plate 15 into the center beam 1; or to assist in welding the bottom plate 11, the first web 12, the second web 13, and the cover plate 14 into the center beam 1.

[0092] In this embodiment, as Figures 1 - 4 shown, taking the auxiliary device for forming the center beam to assist in welding the bottom plate 11, the first web 12, the second web 13, the cover plate 14, and the rib plate 15 into the center beam 1 as an example, where 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 that of the second web 13.

[0093] It can be understood that the auxiliary device for forming the center beam can also be used to assist in welding other types of center beams 1. Specifically, other types of center beams 1 can be: a center beam 1 in which the first web 12 and the second web 13 have different shapes and different plate thicknesses, a center beam 1 in which the first web 12 and the second web 13 have different shapes but the same plate thickness, a center beam 1 in which the first web 12 and the second web 13 have the same shape but different plate thicknesses, or a center beam 1 in which the first web 12 and the second web 13 have the same shape and the same plate thickness, etc.

[0094] Among them, the cushion blocks are detachably connected to the tabletop of the base 4. Setting the cushion blocks and the base 4 to be detachably connected enables the setting position of the cushion blocks on the base 4, the number of cushion blocks, and the specifications of the cushion blocks to be adjusted adaptively according to the actual working conditions. Thus, during the subsequent process of assisting in welding the center beam 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 ways in which the cushion blocks are detachably connected to the tabletop of the base 4 include but are not limited to plugging, clamping, bolt and nut mating connection, or screw connection, etc. In this embodiment, the cushion blocks include two first cushion blocks 51, one second cushion block 52, and one third cushion block 53.

[0095] Specifically, the deflection refers to: the amount of bending deformation of an object after being stressed.

[0096] Performing side deflection on the basic structure means: setting one of the first web 12 and the second web 13 of the basic structure directly below the other; applying a force to the basic structure to deform it into a first arc shape, and the center of the first arc shape is far from the one of the first web 12 and the second web 13 located below relative to the one located above.

[0097] Upward deflection of the basic structure means that the bottom plate 11 of the basic structure is located directly below the first web 12 and the second web 13; a force is applied to the basic structure to deform it 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.

[0098] Among them, as Figure 3 and Figure 4 shown, two positioners 2 are arranged at intervals on both sides of the length direction of the base 4; the positioner 2 is provided with a pallet 3, and the positioner 2 can drive the pallet 3 to rotate around a fixed axis and can drive the pallet 3 to lift along its own height direction. The height direction of the positioner 2 is parallel to the height direction of the base 4. The pallet 3 is used to fix the installation position of the basic structure.

[0099] Specifically, when the basic structure is fixed to the pallet 3 and before the basic structure undergoes side deflection and upward deflection, the fixed axis, the length direction of the basic structure, and the length direction of the base 4 are all parallel. When the basic structure is fixed to the pallet 3 and before the basic structure undergoes side deflection and upward deflection, the height direction of the positioner 2, the height direction of the base 4, and the height direction of the basic structure are all parallel, that is, the Figure 3 and Figure 4 up and down directions in.

[0100] The two positioners 2 are arranged at intervals on both sides of the length direction of the base 4. The two positioners 2 can drive the corresponding pallets 3 to lift along their own height directions. After the basic structure is fixed to the pallets 3 of the two positioners 2, the pallets 3 of the two positioners 2 can drive the basic structure to lift along its own height direction. During the subsequent auxiliary welding of the middle beam 1, it is convenient to adjust the quantity, specifications, and installation positions of the pads; secondly, the positioner 2 can drive the corresponding pallet 3 to rotate around a fixed axis. During the subsequent auxiliary welding of the middle beam 1, after the basic structure is fixed to the pallet 3, it can drive the basic structure to rotate around the fixed axis. After the overall structure composed of the basic structure, the rib plate 15, and the cover plate 14 is fixed to the pallet 3, it can drive the overall structure composed of the basic structure, the rib plate 15, and the cover plate 14 to rotate around the fixed axis, so as to facilitate the seam welding of the basic structure, the rib plate 15, and the cover plate 14 to form the middle beam 1. Compared with the prior art using the hoisting method, it can effectively improve the efficiency and safety of the formed middle beam 1. In this embodiment, it is preferably that the fixed axis is collinear with the central axis of the middle beam 1.

[0101] Specifically, as Figure 3 and Figure 4As shown in the figure, the positioner 2 further includes a first lifting mechanism and a rotating mechanism connected to the output end of the first lifting mechanism, and the pallet 3 is connected to the output end of the rotating mechanism; the first lifting mechanism can drive the rotating mechanism and the pallet 3 to lift synchronously along its own height direction, and the rotating mechanism can drive the pallet 3 to rotate around a fixed axis. As an alternative solution, two positioners 2 are replaced with two first multi-axis robotic arms; a pallet 3 is provided at the output end of each first multi-axis robotic arm, and the first multi-axis robotic arm can at least drive the pallet 3 to lift along the height direction of the base 4 and can drive the pallet 3 to rotate around a fixed axis. It can be understood that the positioner 2 can also be replaced with other driving mechanisms that can drive the pallet 3 to lift along the height direction of the base 4 and can drive the pallet 3 to rotate around a fixed axis. Among them, the specific structures of the first lifting mechanism, the rotating mechanism and the first multi-axis robotic arm all belong to the prior art, so they will not be described in detail here.

[0102] Specifically, the pallet 3 is provided with at least one first limiting unit and at least two second limiting units. At least one first limiting unit can limit the basic structure on the plate surface of the pallet 3 along a first direction, and at least two second limiting units can limit the basic structure on the plate surface of the pallet 3 along a second direction. The first direction is perpendicular to the plate surface of the pallet 3, and the second direction is perpendicular to the spacing direction of the two positioners and perpendicular to the first direction. That is, the first direction is parallel to the height direction of the positioner 2, and the second direction is perpendicular to the length direction of the base 4 and perpendicular to the first direction. To realize the setting position of the basic structure on the pallets 3 of the two positioners 2 and the setting position of the overall structure composed of the basic structure, the rib plate 15 and the cover plate 14 on the pallets 3 of the two positioners 2.

[0103] It can be understood that the bottom plate 11 of the basic structure is in contact with and supported on the plate surface of the pallet 3, and before the basic structure undergoes side deflection and upward deflection: the length directions of the first web 12, the second web 13, the bottom plate 11, the cover plate 14, the basic structure and the base 4 are all parallel; the spacing direction between the first web 12 and the second web 13 is parallel to the second direction; the first direction, the height direction of the basic structure, the height direction of the positioner 2 and the height direction of the base 4 are all parallel.

[0104] In this embodiment, taking the pallet 3 as an example with two first limiting units and two second limiting units, the output ends of the two first limiting units can approach or move away from the plate surface of the pallet 3 along the first direction, and the output ends of the two second limiting units can approach or move away from each other along the second direction. Define the two first limiting units as the first sub-limiting unit 6 and the second sub-limiting unit 7 respectively, and the two second limiting units as the third sub-limiting unit 8 and the fourth sub-limiting unit 9 respectively. Specifically, the pallet 3 is further provided with a first mounting seat 101 and a second mounting seat 102, and the first mounting seat 101 and the second mounting seat 102 are spaced apart along the second direction.

[0105] As Figure 4 shown, the first sub-limiting unit 6 includes a first sliding arm 61 slidably connected to the first mounting seat 101 in the second direction, a first lead screw nut assembly disposed at the output end of the first sliding arm 61, and a first locking member 62; the first locking member 62 can lock or unlock the relative position of the first sliding arm 61 and the first mounting seat 101; the first lead screw nut assembly includes a first nut, a first lead screw 63, and a first limiting block 64 fixedly connected to one axial end of the first lead screw 63, the first nut can drive the first lead screw 63 to move along its own axial direction, and the axial direction of the first lead screw 63 is parallel to the first direction. Exemplarily, taking the first locking member 62 as a screw, the first locking member 62 is threadedly connected to the first mounting seat 101 and can be tightened against the first sliding arm 61 in the first direction.

[0106] As Figure 4 shown, the second sub-limiting unit 7 includes a second sliding arm 71 slidably connected to the second mounting seat 102 in the second direction, a second lead screw nut assembly disposed at the output end of the second sliding arm 71, and a second locking member 72; the second locking member 72 can lock or unlock the relative position of the second sliding arm 71 and the second mounting seat 102; the second lead screw nut assembly includes a second nut, a second lead screw 73, and a second limiting block 74 fixedly connected to one axial end of the second lead screw 73, the second nut can drive the first lead screw 63 to move along its own axial direction, and the axial direction of the second lead screw 73 is parallel to the first direction. Exemplarily, taking the second locking member 72 as a screw, the second locking member 72 is threadedly connected to the second mounting seat 102 and can be pressed against the second sliding arm 71 in the first direction.

[0107] As Figure 4 shown, the third sub-limiting unit 8 includes a third lead screw nut assembly disposed on the first mounting seat 101, the third lead screw nut assembly includes a third nut, a third lead screw 81, and a third limiting block 82 fixedly connected to one axial end of the third lead screw 81, the third nut can drive the third lead screw 81 to move along its own axial direction, and the axial direction of the third lead screw 81 is parallel to the second direction.

[0108] As Figure 4 shown, the fourth sub-limiting unit 9 includes a fourth lead screw nut assembly disposed on the second mounting seat 102, the fourth lead screw nut assembly includes a fourth nut, a fourth lead screw 91, and a fourth limiting block 92 fixedly connected to one axial end of the fourth lead screw 91, the fourth nut can drive the fourth lead screw 91 to move along its own axial direction, and the axial direction of the fourth lead screw 91 is parallel to the second direction. The third limiting block 82 and the fourth limiting block 92 can approach or move away from each other in the second direction.

[0109] With such a setting, it is achieved that the output ends of both first limiting units can approach or move away from the plate surface of the pallet 3 along the first direction, and the output ends of the two second limiting units can approach or move away from each other along the second direction, so that the setting position of the basic structure on the pallet 3 can be fixed, and it is possible to be applicable to fixing basic structures of different size specifications, or the setting position of the overall structure composed of the basic structure, the rib plate 15 and the cover plate 14 on the pallet 3.

[0110] It can be understood that the first limiting unit and the second limiting unit 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 pallet 3, and can limit the setting position of the overall structure composed of the basic structure, the rib plate 15 and the cover plate 14 on the pallet 3. The specific structure and working principle of the screw-nut assembly both belong to the prior art and will not be elaborated here.

[0111] Among them, the force-applying unit is used to apply a force to the basic structure, and is also used to apply a force to the overall structure composed of the basic structure and the rib plate 15.

[0112] In this embodiment, it is preferred that the force-applying unit can directly apply a force to the basic structure along the height direction of the base 4, and can directly apply a force to the overall structure composed of the basic structure and the rib plate 15 along the height direction of the base 4. In this embodiment, the number of force-applying units is two, so that the basic structure can be deflected laterally and also deflected upward.

[0113] Exemplarily, the force-applying unit can adopt structures such as a jack or 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.

[0114] 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 to the bottom plate 11 respectively, spot-weld the cover plate 14 to the first web 12 and the second web 13, seam-weld the inner side of the first web 12 close to the second web 13 to the bottom plate 11, seam-weld the inner side of the second web 13 close to the first web 12 to the bottom plate 11, seam-weld the outer side of the first web 12 far from the second web 13 to the bottom plate 11, seam-weld the outer side of the second web 13 far from the first web 12 to the bottom plate 11, seam-weld the cover plate 14 to the first web 12, seam-weld the cover plate 14 to the second web 13, and seam-weld the rib plate 15 to the first web 12, the second web 13 and the bottom plate 11.

[0115] Exemplarily, the welding unit includes a translation mechanism, a second lifting mechanism, and a welding head. The second lifting mechanism is disposed at the output end of the translation mechanism, and the welding head is disposed at the output end of the second lifting mechanism. The translation mechanism can drive the second lifting mechanism and the welding head to translate synchronously, and the second lifting mechanism can drive the welding head to lift, so as to facilitate and quickly weld two workpieces to be welded. The second lifting mechanism can also be replaced by a third multi-axis robotic arm or the like, as long as it can realize the welding of two workpieces to be welded.

[0116] It can be understood that the welding unit can be adaptively increased according to the actual working conditions.

[0117] Embodiment III

[0118] This embodiment provides a method for forming a middle beam. By adopting this method for forming a middle beam, the bottom plate 11, the cover plate 14, and the first web 12 and the second web 13 with different shapes and / or plate thicknesses can be formed into the middle beam 1, or by adopting this method for forming a middle beam, the bottom plate 11, the cover plate 14, the rib plate 15, and the first web 12 and the second web 13 with different shapes and / or plate thicknesses can be formed into the middle beam 1. In both cases, the problem of complex and large deformation after the middle beam 1 is welded and formed can be effectively avoided, and there is no need to perform flame straightening on the formed middle beam 1, which can effectively improve the efficiency and quality of the formed middle beam 1, and can effectively reduce the cost of the formed middle beam 1. Secondly, by using the middle beam forming auxiliary device in Embodiment II to assist in implementing this method for forming a middle beam, compared with the prior art in which the setting orientation of the overall structure formed by frequently adjusting each stage of the middle beam 1 forming process by means of hoisting, the efficiency of the formed middle beam 1 can be further improved, and the safety of the formed middle beam 1 can be effectively improved.

[0119] Specifically, as Figures 1 to 11 shown, this method for forming a middle beam includes:

[0120] S100. Spot-weld the first web 12 and the second web 13 to the bottom plate 11 respectively to form a basic structure.

[0121] Specifically, before performing step S100, first determine whether to set the bottom plate 11 to include at least two sections and perform butt welding on the seams, whether to set the first web 12 to include at least two sections and perform butt welding on the seams, and whether to set the second web 13 to include at least two sections and perform butt welding on the seams according to the length of the middle beam 1 to be formed as expected.

[0122] When the length of the middle beam 1 is greater than or equal to the set length, set the bottom plate 11 to include at least two sections and perform butt welding on the seams, set the first web 12 to include at least two sections and perform butt welding on the seams, and set the second web 13 to include at least two sections and perform butt welding on the seams, and then perform step S100. When the length of the middle beam 1 is less than the set length, directly perform step S100.

[0123] 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.

[0124] S200. Rotate the basic structure so that the first web 12 is directly below the second web 13.

[0125] Specifically, step S200 includes:

[0126] S210. Lift and install the basic structure onto the pallets 3 of the two positioners 2, and fix the relative positions of the two ends in the length direction of the basic structure and the pallets 3 of the two positioners 2 one by one. It can be understood that at this time, the basic structure does not have side deflection and upward deflection.

[0127] Specifically, the specific steps of step S210 include: Lift and install the basic structure onto the pallets 3 of the two positioners 2 so that the bottom plate 11 of the basic structure is supported on the pallets 3 of the two positioners 2; control the first sub-limiting unit 6 of the two positioners 2 so that the first limiting blocks 64 of the two positioners 2 are pressed against the second web 13 along the first direction; control the second sub-limiting unit 7 of the two positioners 2 so that the second limiting blocks 74 of the two positioners 2 are pressed against the bottom plate 11 along the first direction; control the third sub-limiting unit 8 and the fourth sub-limiting unit 9 of the two positioners 2 so that the third limiting blocks 82 and the fourth limiting blocks 92 of each positioner 2 approach each other along the second direction, and the third limiting block 82 of each positioner 2 abuts against the second web 13 along the second direction, and the fourth limiting block 92 of each positioner 2 abuts against the first web 12 along the second direction. Set in this way to fix the relative position of the basic structure on the pallets 3 of the two positioners 2, which is convenient for subsequent rotation of the basic structure.

[0128] S220. Control the two positioners 2 to drive the corresponding pallets 3 to rotate synchronously around the fixed axis, so as to drive the basic structure to rotate synchronously around the fixed axis until the first web 12 is directly below the second web 13.

[0129] S300. Apply a first acting force to the basic structure to deform it into a first arc shape, the center of the first arc shape is far from the first web 12 relative to the second web 13, and the chord height of the first arc shape is the first preset chord height. The first preset chord height is less than the limit side deflection chord height.

[0130] 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.

[0131] Specifically, such as Figure 5As shown, the spacer block includes two first spacer blocks 51. Step S300 includes:

[0132] S310. Control the first sub-limiting units 6 of the two positioners 2 so that a first limiting avoidance gap is formed between the first limiting blocks 64 of each positioner 2 and the second web 13. Control the second sub-limiting units 7 of the two positioners 2 so that a first limiting avoidance gap is formed between the second limiting blocks 74 of each positioner 2 and the bottom plate 11. Control the third sub-limiting units 8 of the two positioners 2 so that a second avoidance gap is formed between the third limiting blocks 82 of each positioner 2 and the second web 13, and the second avoidance gap is equal to the sum of the side deflection avoidance gap and N times the dislocation gap, where N is a positive number greater than 1. It can be understood that at this time, the bottom plate 11 is supported on the fourth limiting block 92.

[0133] With such a setting, during the execution of step S320, situations such as the second web 13 being pressed and deformed by the continuous descent of the third limiting block 82 when the first web 12 is supported on the two first spacer blocks 51 are avoided. Secondly, after the execution of step S320, it is ensured that the gap between the third limiting block 82 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.

[0134] Specifically, the dislocation gap refers to the dislocation amount generated when the pallet 3 continues to descend when the basic structure is supported on the support surface. For step S310, the support surface is the top surface of the first spacer block 51 along the height direction of the base 4.

[0135] Specifically, the value of the side deflection avoidance gap is such that it can ensure that the basic structure undergoes side deflection and deforms into a first arc shape, and the chord height of the first arc shape is the first preset chord height. The value of the side deflection avoidance gap is greater than or equal to the value of the first preset chord height.

[0136] Specifically, the value of the limiting avoidance gap is such that it can ensure that the basic structure effectively undergoes side deflection deformation and avoid the basic structure from toppling. Further, when the basic structure topples, the basic structure can abut against the first limiting block 64 and / or the second limiting block 74.

[0137] Exemplarily, the value of the limiting avoidance gap is set to be greater than zero and less than 3 mm.

[0138] Since the first web 12 is located directly below the second web 13 at this time, the value of the limiting avoidance gap is set to be greater than zero and less than 3 mm, so that when a first acting force is applied to the middle region of the basic structure along the length direction, the basic structure can effectively deform and can effectively avoid the basic structure from toppling. The value of the side deflection avoidance gap is set to be greater than or equal to the first preset chord height, so that the basic structure can effectively deform into a first arc shape and the chord height of the first arc shape can be the first preset chord height.

[0139] It is understandable that the value range of the limit avoidance gap and the value of the side deflection avoidance gap can also be adaptively adjusted according to the actual working conditions.

[0140] S320, as Figure 5 shown, control the two positioners 2 to drive the corresponding pallets 3 to synchronously descend along their own height directions until the first web 12 is supported on the two first pads 51, and the two first pads 51 are respectively located inside the two ends of the first web 12 in the length direction. Specifically, before performing step S320, level the base 4 in advance, and connect the two first pads 51 to the tabletop of the base 4 in advance.

[0141] Preferably, the top surface of the first pad 51 along the height direction of the base 4 is an arc surface, and the arc surface is in arc-shaped matching with the first arc. It can improve the quality of bending the basic structure into the first arc shape. As an alternative, as Figure 5 shown, the top surface of the first pad 51 along the height direction of the base 4 is a plane.

[0142] S330. Apply a first acting force from top to bottom along the height direction of the base 4 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 and deformed into a first arc shape, and the center of the first arc shape is relatively far from the first web 12 with respect to the second web 13.

[0143] Preferably, along the height direction of the base 4, the maximum height of the first pad 51 is equal to the first preset chord height; when the middle area in the length direction of the basic structure abuts against the tabletop of the base 4 along the height direction of the base 4, the chord height of the first arc shape is the first preset chord height.

[0144] As an alternative, the maximum height of the two first pads 51 along the height direction of the base 4 can also be adaptively set to be greater than the first preset chord height according to the size specification of the basic structure. When applying a first acting force from top to bottom along the height direction of the base 4 to the middle area in the length direction of the basic structure, it can also realize bending and deforming the basic structure into a first arc shape, the center of the first arc shape is relatively far from the first web 12 with respect to the second web 13, and the chord height of the first arc shape is the first preset chord height.

[0145] Specifically, apply a first acting force to the middle area in the length direction of the basic structure through a force application unit.

[0146] Set in this way to preliminarily form a prefabricated lateral deflection reverse deformation of the basic structure, so that during the subsequent process of seam welding the cover plate 14 to the first web 12, the formed prefabricated lateral deflection reverse deformation can offset the lateral deflection deformation trend generated by welding shrinkage, making the finally formed middle beam 1 basically free of lateral deflection phenomenon. Thus, compared with the prior art, it can effectively avoid the problems of complex deformation and large deformation amount after the middle beam 1 is welded and formed, can effectively avoid the problem of flame straightening required for the formed middle beam 1 due to complex deformation and large deformation amount, can effectively avoid the problem of reduced structural strength of the middle beam 1 caused by flame straightening, and can effectively reduce the cost of the formed middle beam 1.

[0147] Specifically, if the middle beam 1 further includes stiffeners 15, then after step S300, step S400 and the remaining steps after step S400 are executed.

[0148] Specifically, if the middle 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 middle 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.

[0149] 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 spaced apart 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.

[0150] Preferably, step S400 includes:

[0151] S410. Divide a plurality of stiffeners 15 into two first sub-stiffener groups and two second sub-stiffener groups.

[0152] 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 spaced apart along the arc extension direction of the first web 12.

[0153] 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.

[0154] S430. Synchronously seam weld the second sub-stiffeners 152 of the two second 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 a second sub-stiffener 152 arranged between any two adjacent first sub-stiffeners 151.

[0155] It can be understood that the second sub-web plates 152 of the two second sub-web plate groups are synchronously seam-welded starting from the middle in the arc extension direction of the first web 12.

[0156] One second sub-web plate 152 is provided between any two adjacent first sub-web plates 151. This enables the deformation degree of the first web 12 to be reduced as much as possible during the process of seam-welding the web plate 15 to the first web 12.

[0157] Further preferably, along the direction from the middle to both ends in the arc extension direction of the first web 12, the distance between any two adjacent first sub-web plates 151 gradually decreases, and the distance between any two adjacent second sub-web plates 152 gradually decreases. With such a setting, on the basis of ensuring the strengthening function of the web plate 15, the number of web plates 15 can be reduced, and the efficiency of forming the middle beam 1 can be further improved. As an alternative, multiple web plates 15 can also be arranged at equal intervals or distributed according to other set spacing rules along the arc extension direction of the first web 12.

[0158] Specifically, the web plate 15 is seam-welded to the inner side of the first web 12 through a welding unit.

[0159] S500. Remove the first acting force.

[0160] Specifically, when the first acting force is removed, the side deflection amount of the basic structure will decrease due to the removal of the external force.

[0161] For the middle beam 1 including the web plate 15, in order to ensure the side deflection amount of the basic structure and for the convenience of connecting the web plate 15 to the second web 13, step S600 and the remaining steps after step S600 are executed after step S500.

[0162] For the middle beam 1 not including the web 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 web plate 15, the side deflection reverse deformation prefabrication of the middle beam 1 can be formed when the first acting force is removed.

[0163] As an alternative, for the middle beam 1 not including the web plate 15, after step S300 is completed, execute steps S500 to S700, and then execute step S900 and the remaining steps after step S900. This enables the basic structure to form a better side deflection reverse deformation prefabrication.

[0164] S600. Rotate the basic structure so that the second web 13 is located directly below the first web 12.

[0165] Specifically, step S600 includes:

[0166] S610. Control two positioners 2 to drive the corresponding pallets 3 to synchronously rise along their own height directions and rotate around a fixed axis until the bottom plate 11 is supported on the plate surfaces of the pallets 3 of the two positioners 2, and fix the two ends of the arc extension direction of the basic structure and the relative positions of the pallets 3 of the two positioners 2 one by one.

[0167] Specifically, the specific steps of fixing the two ends of the arc extension direction of the basic structure and the relative positions of the two pallets 3 one by one are similar to those of step S210, so they will not be elaborated here.

[0168] S620. Control two positioners 2 to drive the corresponding pallets 3 to synchronously rotate around a fixed axis to drive the basic structure to synchronously rotate around a fixed axis until the second web 13 is directly below the first web 12.

[0169] S700. Apply a second force to the basic structure to deform the basic structure into a first arc shape.

[0170] Specifically, as Figure 6 shown, the spacer block further includes a second spacer block 52. Step S700 includes:

[0171] S710. Control the first sub-limiting units 6 of the two positioners 2 so that a first limiting avoidance gap is formed between the first limiting blocks 64 of each positioner 2 and the second web 13. Control the second sub-limiting units 7 of the two positioners 2 so that a first limiting avoidance gap is formed between the second limiting blocks 74 of each positioner 2 and the bottom plate 11. Control the fourth sub-limiting unit 9 so that a second avoidance gap is formed between the fourth limiting block 92 and the bottom plate 11. It can be understood that at this time, the second web 13 is supported on the third limiting block 82.

[0172] With such a setting, after step S720 is executed, it can be ensured that the gap between the third limiting block 82 and the second web 13 is greater than or equal to the side deflection avoidance gap, so that the basic structure can effectively deflect laterally.

[0173] S720. As Figure 6 shown, control two positioners 2 to drive the corresponding pallets 3 to synchronously descend along their own height directions until the second web 13 is supported on a second spacer block 52, and a second spacer block 52 is located in the middle area of the arc extension direction of the second web 13. Specifically, before executing step S720, detach the two first spacer blocks 51 in advance and connect a second spacer block 52 to the table surface of the base 4.

[0174] Preferably, the top surface of the second spacer block 52 along the height direction of the base 4 is an arc surface, and the arc surface matches the first arc shape. It can improve the quality of bending the basic structure into the first arc shape. As an alternative, as Figure 6As shown, the top surface of the second spacer block 52 along the height direction of the base 4 is a plane.

[0175] S730. Apply a second force simultaneously to the areas near both ends in the extending direction of the arc of the foundation structure from top to bottom along the height direction of the base 4, so that the areas near both ends in the extending direction of the arc of the foundation structure are synchronously bent downward to form a first arc shape.

[0176] Preferably, along the height direction of the base 4, the maximum height of the second spacer block 52 is equal to the first preset chord height; when both ends in the extending direction of the arc of the foundation structure are abutted against the tabletop of the base 4 along the height direction of the base 4, the chord height of the first arc shape is the first preset chord height.

[0177] As an alternative solution, it is also possible to adaptively set the maximum height of a second spacer block 52 along the height direction of the base 4 to be greater than the first preset chord height according to the size specifications of the foundation structure. When applying the second force simultaneously to the areas near both ends in the length direction of the foundation structure from top to bottom along the height direction of the base 4, it is also possible to bend the foundation structure into a first arc shape. The center of the first arc shape is relatively far from the first web 12 with respect to the second web 13, and the chord height of the first arc shape is the first preset chord height.

[0178] Specifically, apply the first force simultaneously to the areas near both ends in the extending direction of the arc of the foundation structure through two force application units one by one.

[0179] 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.

[0180] 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.

[0181] Specifically, sew and weld the rib plate 15 to the second web 13 through a welding unit.

[0182] S900. Remove the second force.

[0183] It can be understood that after the rib plates 15 are sewn and welded to the inner side of the second web 13, the rib plates 15 and the foundation structure form an integral structure. Since two forces (the first force and the second force) are applied to the front and back of the foundation structure, and the rib plates 15 are sewn and welded to the foundation structure, after the second force is removed, the side deflection amount of the integral structure formed by the rib plates 15 and the foundation structure decreases less, resulting in a better prefabrication of side deflection reverse deformation, and there is no need to continuously apply an external force to maintain the side deflection of the integral structure.

[0184] S1000. Rotate the basic structure so that the bottom plate 11 is directly below the first web 12 and the second web 13.

[0185] Specifically, step S1000 includes:

[0186] Control two positioners 2 to drive the corresponding pallets 3 to synchronously rise along their own height directions and rotate around a fixed axis until the bottom plate 11 is supported on the plate surfaces of the pallets 3 of the two positioners 2, and fix the two ends in the arc extension direction of the basic structure and the relative positions of the two pallets 3 one by one.

[0187] Specifically, the specific steps of fixing the two ends in the arc extension direction of the basic structure and the relative positions of the two pallets 3 one by one are similar to those of step S210, so they will not be elaborated here.

[0188] S1100. Apply a third acting force to the basic structure to deform it into a second arc shape. The center of the second arc shape is relatively far from the first web 12 and the second web 13 with respect to the bottom plate 11, and the chord height of the second arc shape is a second preset chord height. The second preset chord height is less than the limit upward deflection chord height.

[0189] 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 undergo. 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.

[0190] Specifically, as Figure 7 shown, the spacer block further includes a third spacer block 53. Step S1100 includes:

[0191] S1101. As Figure 7 shown, control two positioners 2 to drive the corresponding pallets 3 to synchronously descend along their own height directions until the bottom plate 11 is supported on a third spacer block 53, and a third spacer block 53 is located in the middle area in the arc extension direction of the bottom plate 11. Specifically, before performing step S1101, detach two first spacer blocks 51 or a second spacer block 52 in advance, and connect a third spacer block 53 to the tabletop of the base 4.

[0192] Preferably, the top surface of the third spacer block 53 along the height direction of the base 4 is an arc surface, and the arc surface matches the second arc shape. It can improve the quality of bending the basic structure into the second arc shape. As an alternative, as Figure 7 shown, the top surface of the third spacer block 53 along the height direction of the base 4 is a plane.

[0193] S1102. Control the first sub-limiting unit 6 of the two positioners 2 so that the first limiting block 64 of each positioner 2 is away from the second web 13; control the second sub-limiting unit 7 of the two positioners 2 so that the second limiting block 74 of each positioner 2 is away from the bottom plate 11; control the third sub-limiting unit 8 of the two positioners 2 so that the third limiting block 82 of each positioner 2 is away from the second web 13; control the fourth sub-limiting unit 9 of the two positioners 2 so that the fourth limiting block 92 of each positioner 2 is away from the bottom plate 11.

[0194] S1103. Apply a third acting force simultaneously to the areas near both ends in the extending direction of the foundation structure arc along the height direction of the base 4 from top to bottom, so that the areas near both ends in the extending direction of the foundation structure arc are synchronously bent downward 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.

[0195] Preferably, along the height direction of the base 4, the maximum height of the third cushion block 53 is equal to the second preset chord height; when both ends in the extending direction of the foundation structure arc are in contact with the tabletop of the base 4 along the height direction of the base 4, the chord height of the second arc shape is the second preset chord height.

[0196] As an alternative solution, it is also possible to adaptively set the maximum height of a third cushion block 53 along the height direction of the base 4 to be greater than the second preset chord height according to the size specifications of the foundation structure. When applying the third acting force simultaneously to the areas near both ends in the length direction of the foundation structure from top to bottom along the height direction of the base 4, it is also possible to bend the foundation 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. And the chord height of the second arc shape is the second preset chord height.

[0197] Specifically, apply the third acting force simultaneously to the areas near both ends in the extending direction of the foundation structure through the force application unit.

[0198] Set it in this way so that the overall structure composed of the foundation structure and the rib plate 15 forms an upward deflection prefabrication. Thus, during the subsequent process of seam welding the cover plate 14 to the first web 12, the upward deflection prefabrication formed can offset the downward deflection trend caused by the weld shrinkage, making the upward deflection amount of the finally formed middle beam 1 smaller and within the allowable upward deflection amount of the middle beam 1. Therefore, it can effectively avoid the problem of flame straightening required for the formed middle beam 1 due to the downward deflection caused by weld shrinkage, further avoid the problem of reduced structural strength of the middle beam 1 caused by flame straightening, and further reduce the cost of forming the middle beam 1.

[0199] Specifically, if the upwarp reverse deformation of the center sill 1 is not prefabricated, downward deflection will occur after all welding is completed. In particular, the last weld seam will cause a relatively large amount of downward deflection, and when the center sill 1 is applied to a vehicle with a large load, the downward deflection of the center sill 1 will be aggravated. Therefore, it is preferred that the center sill 1 still has a certain amount of upwarp after forming. This part of the upwarp is flattened by the later vehicle load, so that the center sill 1 reaches the ideal working state.

[0200] For the center sill 1 including the gusset plate 15, step S1200 is as follows:

[0201] S1200. Seam-weld the gusset 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.

[0202] Preferably, seam-welding the gusset 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.

[0203] Further preferably, when seam-welding the gusset 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 gusset plates 15 are divided into two groups, and the two groups of gusset plates 15 are synchronously seam-welded to the bottom plate 11.

[0204] 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 synchronously seam-welded to the bottom plate 11.

[0205] 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 synchronously seam-welded to the bottom plate 11.

[0206] Specifically, the gusset plate 15 is seam-welded 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 the welding unit.

[0207] For the center sill 1 without the gusset plate 15, step S1200 is as follows:

[0208] S1200. 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.

[0209] Preferably, 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.

[0210] Preferably, when the inner side of the first web 12 is seam-welded to the bottom plate 11, along the direction of the arc extension 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 synchronously seam-welded to the bottom plate 11.

[0211] Further preferably, when the inner side of the second web 13 is seam-welded to the bottom plate 11, along the direction of the arc extension 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 synchronously seam-welded to the bottom plate 11.

[0212] Specifically, the inner side of the first web 12 is seam-welded to the bottom plate 11 through a welding unit, and the inner side of the second web 13 is seam-welded to the bottom plate 11.

[0213] S1300, as Figure 8 shown, the cover plate 14 is provided to include at least two sub-cover plate parts 141, and the at least two sub-cover plate parts 141 are all spot-welded and positioned on the first web 12 and the second web 13.

[0214] Specifically, the specific steps of providing 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.

[0215] Specifically, the specific steps of spot-welding and positioning the at least two sub-cover plate parts 141 on the first web 12 and the second web 13 include:

[0216] As Figure 8 shown, position the relative positions of the first web 12, the second web 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 12 and the second web 13, and along the direction perpendicular to the first web 12 and the second web 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 13 at the first position 142; spot-weld and position the at least two positioned sub-cover plate parts 141 on the first web 12 and the second web 13.

[0217] Among them, as Figure 8 shown, 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 respective first positions 142 are spaced apart along the arc extension direction of the second web 13.

[0218] Further specifically, when positioning the relative positions of the first web 12, the second web 13, and at least two sub-cover plate portions 141, a fixture or the like can be used to press the preliminarily positioned sub-cover plate portions 141 against the first web 12 and the second web 13. 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 the preliminarily positioned sub-cover plate portions 141 are pressed against the first web 12 and the second web 13 by a fixture or the like, each sub-cover plate portion 141 is positioned to form side deflection and upward deflection adapted to the basic structure. Therefore, in order to make each sub-cover plate portion 141 generate side deflection and upward deflection adapted to the shape of the overall structure, a fitting gap 143 should be formed between the second ends of the end faces close to each other on any two adjacent sub-cover plate portions 141 in the direction perpendicular to the first web 12 and the second web 13.

[0219] Preferably, as Figure 8 shown, the cover plate 14 is provided with two sub-cover plate portions 141 of equal length. Compared with setting three or more sub-cover plate portions 141, the efficiency of spot-welding the sub-cover plate portions 141 to the first web 12 and the second web 13 is high, and the structural strength of the finally formed middle beam 1 is high and the aesthetics is good.

[0220] Specifically, the sub-cover plate portions 141 are spot-welded to the first web 12 and the second web 13 through a welding unit.

[0221] S1400. Keep the third acting force, and seam-weld the outer side of the first web 12 to the bottom plate 11, and seam-weld the outer side of the second web 13 to the bottom plate 11.

[0222] Wherein, the outer side of the first web 12 is the side of the first web 12 away from the second web 13, and the outer side of the second web 13 is the side of the second web 13 away from the first web 12.

[0223] Preferably, when seam-welding the outer side of the first web 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, the first web 12 is divided into two parts, and the two parts of the first web 12 are synchronously seam-welded to the bottom plate 11.

[0224] Preferably, when seam-welding the outer side of the second web 13 to the bottom plate 11, along the direction from the middle to both ends of the arc extension direction of the bottom plate 11, the second web 13 is divided into two parts, and the two parts of the second web 13 are synchronously seam-welded to the bottom plate 11.

[0225] Specifically, the outer sides of the first web 12 and the second web 13 are both seam-welded to the bottom plate 11 through a welding unit.

[0226] S1500. Maintain the third acting force and sew at least two sub-cover plate parts 141 to the second web 13 along the direction from the middle to both ends along the arc extension direction of the second web 13.

[0227] Specifically, along the direction from the middle to both ends along the arc extension direction of the second web 13, divide at least two sub-cover plate parts 141 into two parts, and synchronously sew the two parts of the sub-cover plate parts 141 to the second web 13.

[0228] Specifically, sew the sub-cover plate part 141 to the second web 13 through a welding unit.

[0229] For the middle beam 1 including the rib plate 15, step S1600 is:

[0230] S1600. Let the overall structure composed of the basic structure, the rib plate 15 and the cover plate 14 stand still and cool down.

[0231] For the middle beam 1 not including the rib plate 15, step S1600 is:

[0232] S1600. Let the overall structure composed of the basic structure and the cover plate 14 stand still and cool down.

[0233] S1700. Remove the third acting force.

[0234] For both cases of the middle beam 1 including the rib plate 15 and the middle beam 1 not including the rib plate 15, when step S1700 is completed, after the overall structure cools down and the external force is removed, the upward deflection amount of the overall structure will decrease, but the decrease amount is small, so that the upward deflection pre-deformation of the middle beam 1 is formed in the overall structure.

[0235] It can be understood that for the middle beam 1 including the rib plate 15, the overall structure is composed of the basic structure, the rib plate 15 and the cover plate 14; for the middle beam 1 not including the rib plate 15, the overall structure is composed of the basic structure and the cover plate 14.

[0236] Thus, in the subsequent process of sewing the cover plate 14 to the first web 12, the upward deflection pre-deformation formed can offset the downward deflection deformation trend generated by the weld shrinkage in the subsequent process of sewing the cover plate 14, so that the upward deflection amount of the finally formed middle beam 1 is small and within the allowable upward deflection amount of the middle beam 1. Therefore, it can effectively avoid the problem of flame straightening required for the formed middle beam 1 due to downward deflection caused by weld shrinkage, further avoid the problem of reduced structural strength of the middle beam 1 caused by flame straightening, and further reduce the cost of the formed middle beam 1.

[0237] S1800. Sew at least two sub-cover plate parts 141 to the first web 12 along the direction from the middle to both ends along the arc extension direction of the second web 13.

[0238] Specifically, along the extending direction of the arc of the second web 13 from the middle to both ends, at least two sub-cover plate parts 141 are divided into two parts, and the two parts of the sub-cover plate parts 141 are seam-welded to the first web 12 synchronously.

[0239] Preferably, before seam-welding at least two sub-cover plate parts 141 to the first web 12, the basic structure is rotated around a fixed axis, such as Figure 9 shown, so that the weld seam formed by the first web 12 and at least two sub-cover plate parts 141 faces the top of the basic structure. With such a setting, it is convenient to seam-weld at least two sub-cover plate parts 141 to the first web 12, which can further improve the efficiency of forming the middle beam 1 and can effectively ensure the quality of seam-welding at least two sub-cover plate parts 141 to the first web 12. Among them, the specific steps of rotating the basic structure so that the weld seam between the first web 12 and at least two sub-cover plate parts 141 is located at the top of the basic structure are similar to those of step S200, so they will not be elaborated here.

[0240] Specifically, the sub-cover plate part 141 is seam-welded to the first web 12 through a welding unit.

[0241] It can be understood that since the overall structure formed before performing step S1800 has already formed side deflection reverse deformation prefabrication and upward deflection reverse deformation prefabrication. During the execution of step S1800, the side deflection reverse deformation prefabrication can offset the side deflection deformation caused by seam-welding the cover plate 14 to the first web 12 (the side deflection reverse deformation prefabrication is to bend the overall structure to one side to form a first arc shape, and the side deflection deformation is that the overall structure bends to the other side to form a third arc shape after welding shrinkage. The openings of the first arc shape and the third arc shape are opposite, so that the overall structure can offset the side deflection deformation caused by welding after welding), and the upward deflection reverse deformation prefabrication can offset the downward deflection deformation trend caused by the welding shrinkage due to seam-welding the cover plate 14 to the first web 12, so that the side deflection amount of the finally formed middle beam 1 is within the allowable side deflection amount range, and the upward deflection amount of the middle beam 1 is within the allowable upward deflection amount range.

[0242] Therefore, compared with the prior art, it can effectively avoid the problems of complex deformation and large deformation amount after the middle beam 1 is welded and formed, can effectively avoid the problem of flame straightening of the formed middle beam 1 due to side deflection, can effectively avoid the problem of flame straightening of the formed middle beam 1 due to downward deflection, can effectively avoid the problem of reduction of the structural strength of the middle beam 1 caused by flame straightening, and can effectively reduce the cost of forming the middle beam 1.

[0243] S1900. Seam-weld the gaps between any two adjacent sub-cover plate parts 141 to form the middle beam 1.

[0244] Specifically, the gaps between any two adjacent sub-cover plate parts 141 are seam-welded through a welding unit.

[0245] S2000. Let the formed middle beam 1 stand still for cooling.

[0246] Specifically, after step S2000, the formed middle beam 1 is lifted and hoisted to the expected position for other process steps such as inspection.

[0247] As Figure 1 and Figure 2 shown, taking the first web 12 as a flat web and the second web 13 as an L-shaped web as an example below, the process of welding and forming the bottom plate 11, flat web, L-shaped web, rib plate 15 and cover plate 14 through this middle beam forming method is illustrated.

[0248] As Figure 2 shown, by way of example, 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 length of the expected formed middle 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.

[0249] Specifically, as Figures 1 to 11 shown, the process of welding and forming the bottom plate 11, flat web, L-shaped web, rib plate 15 and cover plate 14 through this middle beam forming method is as follows:

[0250] The bottom plate 11 is set to be formed by butt welding of three sections, the first web 12 is set to be formed by butt welding of three sections, and the second web 13 is set to be formed by three butt joints according to the length of the expected formed middle beam 1. Preferably, the total length of the formed bottom plate 11 is greater than the length of the expected formed middle beam 1, that is, process allowance is set for the bottom plate 11. The total length of the formed first web 12 is greater than the length of the expected formed middle beam 1, that is, process allowance is set for the first web 12. The total length of the formed second web 13 is greater than the length of the expected formed middle beam 1, that is, process allowance is set for the second web 13. By way of example, the process allowances for the bottom plate 11, the first web 12 and the second web 13 are all 30 mm.

[0251] 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.

[0252] Hoist the basic structure onto the pallets 3 of the two positioners 2, such that the bottom plate 11 is supported on the plate surfaces of the pallets 3 of the two positioners 2, and the first web 12 and the second web 13 are spaced apart along the second direction. Control the first sub-limiting units 6 of the two positioners 2, such that the first limiting blocks 64 of the two positioners 2 are pressed against the second web 13 along the first direction; control the second sub-limiting units 7 of the two positioners 2, such that the second limiting blocks 74 of the two positioners 2 are pressed against the bottom plate 11 along the first direction; control the third sub-limiting units 8 and the fourth sub-limiting units 9 of the two positioners 2, such that the third limiting blocks 82 and the fourth limiting blocks 92 of each positioner 2 approach each other along the second direction, and the third limiting block 82 of each positioner 2 abuts against the second web 13 along the second direction, and the fourth limiting block 92 of each positioner 2 abuts against the first web 12 along the second direction.

[0253] Control the two positioners 2 to drive the corresponding pallets 3 to rotate synchronously by 90° in the first clockwise direction around the fixed axis, driving the basic structure to rotate synchronously by 90° in the first clockwise direction around the fixed axis, such that the first web 12 is located directly below the second web 13.

[0254] Level the base table 4, and connect the two first cushion blocks 51 to the table surface of the base table 4. The first cushion blocks 51 are rectangular cushion blocks, and the height of the first cushion blocks 51 in the height direction of the base table 4 is 55 mm.

[0255] Control the first sub-limiting units 6 of the two positioners 2, such that a first limiting avoidance gap is formed between the first limiting block 64 of each positioner 2 and the second web 13; control the second sub-limiting units 7 of the two positioners 2, such that a first limiting avoidance gap is formed between the second limiting block 74 of each positioner 2 and the bottom plate 11. The first limiting avoidance gap is 3 mm. Control the third sub-limiting units 8 of the two positioners 2, such that a second avoidance gap is formed between the third limiting block 82 of each positioner 2 and the second web 13. The second 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 side deflection avoidance gap is 5 mm.

[0256] Control the two positioners 2 to drive the corresponding pallets 3 to descend synchronously along their own height directions until the first web 12 is supported on the two first cushion blocks 51, and the two first cushion blocks 51 are respectively located inside the two ends of the first web 12 in the length direction.

[0257] Apply a first acting force from top to bottom in the height direction of the base 4 to the middle area in the length direction of the base structure, so that the middle area in the length direction of the base structure is bent downward into a first arc shape, and the center of the first arc shape is relatively far from the second web 13 away from the first web 12. When the middle area in the length direction of the base structure abuts against the tabletop of the base 4 in the height direction of the base 4, the chord height of the first arc shape is the first preset chord height, and the first chord height is 5 mm.

[0258] Divide multiple rib plates 15 into two first sub-rib plate groups and two second sub-rib plate groups. Along the direction of the arc extension of the first web 12 from the middle to both ends, 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 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 make a second sub-rib plate 152 be provided between any two adjacent first sub-rib plates 151. And make 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 becomes smaller, and the distance between any two adjacent second sub-rib plates 152 gradually becomes smaller.

[0259] Remove the first acting force.

[0260] Control the two positioners 2 to drive the corresponding pallets 3 to synchronously rise along their own height directions and rotate 90° around a fixed axis until the bottom plate 11 is supported on the plate surfaces of the pallets 3 of the two positioners 2. Control the first sub-limiting units 6 of the two positioners 2, so that the first limiting blocks 64 of each positioner 2 are pressed against the second web 13 along the height direction of the positioner 2; control the second sub-limiting units 7 of the two positioners 2, so that the second limiting blocks 74 of the two positioners 2 are pressed against the bottom plate 11 along the height direction of the positioner 2; control the third sub-limiting units 8 and the fourth sub-limiting units 9 of the two positioners 2, so that the third limiting blocks 82 and the fourth limiting blocks 92 of each positioner 2 approach each other along the second direction, and the third limiting block 82 abuts against the second web 13 along the second direction, and the fourth limiting block 92 abuts against the first web 12 along the second direction.

[0261] Control the two positioners 2 to drive the corresponding pallets 3 to synchronously rotate 90° around a fixed axis in the second clockwise direction, drive the base structure to synchronously rotate 90° around a 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.

[0262] Detach two first cushion blocks 51 in advance and connect a second cushion block 52 to the tabletop of the base 4. The second cushion block 52 is a rectangular cushion block, and the height of the second cushion block 52 in the height direction of the base 4 is 65 mm.

[0263] Control the first sub-limiting units 6 of the two positioners 2 so that a first limiting avoidance gap is formed between the first limiting blocks 64 of each positioner 2 and the second web 13. Control the second sub-limiting units 7 of the two positioners 2 so that a first limiting avoidance gap is formed between the second limiting blocks 74 of each positioner 2 and the bottom plate 11. Control the fourth sub-limiting unit 9 so that a second avoidance gap is formed between the fourth limiting block 92 and the bottom plate 11. It can be understood that at this time, the second web 13 is supported on the third limiting block 82.

[0264] Control the two positioners 2 to drive the corresponding pallet 3 to synchronously descend along its own height direction until the second web 13 is supported on a second cushion block 52, and a second cushion block 52 is located in the middle area in the arc extension direction of the second web 13.

[0265] Apply a second force simultaneously to the areas near both ends in the arc extension direction of the foundation structure from top to bottom in the height direction of the base 4, so that the areas near both ends in the arc extension direction of the foundation structure are synchronously bent downward into a first arc shape. When both ends in the arc extension direction of the foundation structure abut against the tabletop of the base 4 in the height direction of the base 4, the chord height of the first arc shape is a first preset chord height, and the first preset chord height is 5 mm.

[0266] Sew and weld the first sub-rib plates 151 of the two first sub-rib plate groups to the second web 13 along the arc extension direction of the second web 13 from the middle to both ends, and sew and weld the second sub-rib plates 152 of the two second sub-rib plate groups to the second web 13.

[0267] Remove the second force.

[0268] Control the two positioners 2 to drive the corresponding pallet 3 to synchronously rise along its own height direction and rotate 90° around a fixed axis until the bottom plate 11 is supported on the plate surfaces of the pallets 3 of the two positioners 2. Control the first sub-limiting units 6 of the two positioners 2 so that the first limiting blocks 64 of each positioner 2 are pressed against the second web 13 in the height direction of the positioner 2; control the second sub-limiting units 7 of the two positioners 2 so that the second limiting blocks 74 of the two positioners 2 are pressed against the bottom plate 11 in the height direction of the positioner 2; control the third sub-limiting units 8 and the fourth sub-limiting units 9 of the two positioners 2 so that the third limiting blocks 82 and the fourth limiting blocks 92 of each positioner 2 approach each other along the second direction, and the third limiting block 82 abuts against the second web 13 along the second direction, and the fourth limiting block 92 abuts against the first web 12 along the second direction.

[0269] Detach a second cushion block 52 in advance and connect a third cushion block 53 to the tabletop of the base 4. The third cushion block 53 is a rectangular cushion block, and the height of the third cushion block 53 in the height direction of the base 4 is 50 mm.

[0270] Control the two positioners 2 to drive the corresponding pallets 3 to synchronously descend along their own height directions until the bottom plate 11 is supported on a third cushion block 53, and a third cushion block 53 is located in the middle area in the arc extension direction of the bottom plate 11.

[0271] Control the first sub-limiting units 6 of the two positioners 2 so that the first limiting blocks 64 of each positioner 2 are all away from the second web 13; control the second sub-limiting units 7 of the two positioners 2 so that the second limiting blocks 74 of each positioner 2 are all away from the bottom plate 11; control the third sub-limiting units 8 of the two positioners 2 so that the third limiting blocks 82 of each positioner 2 are all away from the second web 13; control the fourth sub-limiting units 9 of the two positioners 2 so that the fourth limiting blocks 92 of each positioner 2 are all away from the bottom plate 11.

[0272] Apply a third acting force simultaneously to the areas near both ends in the arc extension direction of the foundation structure from top to bottom in the height direction of the base 4, so that the areas near both ends in the arc extension direction of the foundation structure are synchronously bent downward into a second arc shape, and the center of the second arc shape is relatively far from the first web 12 and the second web 13 with respect to the bottom plate 11. When both ends in the arc extension direction of the foundation structure abut against the tabletop of the base 4 in the height direction of the base 4, the chord height of the second arc shape is a second preset chord height, and the second preset chord height is 50 mm.

[0273] Sew-weld the rib plates 15 to the bottom plate 11; sew-weld the inner side of the first web 12 to the bottom plate 11; sew-weld the inner side of the second web 13 to the bottom plate 11. Specifically, along the arc extension direction of the bottom plate 11 from the middle to both ends, divide the multiple rib plates 15 into two groups and synchronously sew-weld the two groups of rib plates 15 to the bottom plate 11. Along the arc extension direction of the bottom plate 11 from the middle to both ends, divide the first web 12 into two parts and synchronously sew-weld the two parts 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, divide the second web 13 into two parts and synchronously sew-weld the two parts of the second web 13 to the bottom plate 11.

[0274] The set cover plate 14 includes two sub-cover plate parts 141. Position the relative positions of the first web 12, the second web 13 and the two sub-cover plate parts 141 so that the 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 along the direction perpendicular to the first web 12 and the second web 13, the first ends of the two sub-cover plate parts 141 facing the approaching end faces are in contact with the second web 13 at the first position 142; spot-weld the two positioned sub-cover plate parts 141 to the first web 12 and the second web 13 respectively. Among them, the first position 142 is located at the middle position of the arc extension direction of the second web 13; along the direction perpendicular to the first web 12 and the second web 13, a mating gap 143 is formed between the second ends of the two sub-cover plate parts 141 facing the approaching end faces.

[0275] Maintain the third acting force, seam-weld the outer side of the first web 12 to the bottom plate 11, and seam-weld the outer side of the second web 13 to the bottom plate 11. Specifically, along the arc extension direction of the bottom plate 11 from the middle to both ends, divide the first web 12 into two parts, and simultaneously seam-weld the two parts 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, divide the second web 13 into two parts, and simultaneously seam-weld the two parts of the second web 13 to the bottom plate 11.

[0276] Maintain the third acting force, and seam-weld at least two sub-cover plate parts 141 to the second web 13 along the arc extension direction of the second web 13 from the middle to both ends. Specifically, along the arc extension direction of the second web 13 from the middle to both ends, divide at least two sub-cover plate parts 141 into two parts, and simultaneously seam-weld the two parts of the sub-cover plate parts 141 to the second web 13. Specifically, the weld seam formed by seam-welding the sub-cover plate part 141 to the second web 13 is a fillet weld.

[0277] Let the overall structure composed of the basic structure, the rib plate 15 and the cover plate 14 stand still for cooling.

[0278] Remove the third acting force.

[0279] Seam-weld at least two sub-cover plate parts 141 to the first web 12 along the arc extension direction of the second web 13 from the middle to both ends. Specifically, along the arc extension direction of the second web 13 from the middle to both ends, divide at least two sub-cover plate parts 141 into two parts, and simultaneously seam-weld the two parts of the sub-cover plate parts 141 to the first web 12. Specifically, the weld seam formed by seam-welding the sub-cover plate part 141 to the first web 12 is a groove weld.

[0280] Seam-weld the gaps between any two adjacent sub-cover plate parts 141 to form the middle beam 1.

[0281] Leave the formed middle beam 1 to cool statically. Then hoist the formed middle beam 1 to the expected position for inspection and other technological steps.

[0282] Thus, by forming the bottom plate 11, the cover plate 14, the rib plate 15, the first web 12 and the second web 13 into the middle beam 1 through this middle beam forming method, it can effectively avoid the problems of complex and large deformation after the middle beam 1 is formed by welding, and there is no need to perform flame straightening on the formed middle beam 1, which can effectively improve the efficiency, quality and safety of the formed middle beam 1, and can effectively reduce the cost of the formed middle beam 1.

[0283] Obviously, the above-mentioned embodiments of the present invention are only 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. Method for forming a middle beam, the middle beam comprising a bottom plate (11), a first web (12), a second web (13) and a cover plate (14), characterized in that, The first web (12) is different in shape and / or plate thickness from the second web (13); the method for forming the middle beam includes: After spot-welding and positioning both the first web (12) and the second web (13) on the bottom plate (11) to form a basic structure: Rotating the basic structure so that the first web (12) is directly below the second web (13); Applying a first acting force to the basic structure to deform the basic structure into a first arc shape, the center of the first arc shape is away from the first web (12) relative to the second web (13), 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 side deflection chord height; Providing that the cover plate (14) includes at least two sub-cover plate parts (141), and after spot-welding and positioning at least two of the sub-cover plate parts (141) on both the first web (12) and the second web (13): Seam-welding at least two of the sub-cover plate parts (141) to the second web (13) along the direction from the middle to both ends along the arc extension direction of the second web (13); Seam-welding at least two of the sub-cover plate parts (141) to the first web (12) along the direction from the middle to both ends along the arc extension direction of the second web (13).

2. The method for forming a middle beam according to claim 1, characterized in that, The middle beam further includes a plurality of rib plates (15); after the basic structure is deformed into the first arc shape and before at least two of the sub-cover plate parts (141) are spot-welded and positioned on both the first web (12) and the second web (13), the following steps are further included: Seam-welding a plurality of the rib plates (15) to the inner side of the first web (12) so that the plurality of rib plates (15) are spaced apart along the arc extension direction of the first web (12); Removing the first acting force; Rotating the basic structure so that the second web (13) is directly below the first web (12); Applying a second acting force to the basic structure to deform the basic structure into the first arc shape; Seam-welding a plurality of the rib plates (15) to the inner side of the second web (13); Removing the second acting force; Wherein, the inner side of the first web (12) is the side of the first web (12) close to the second web (13); the inner side of the second web (13) is the side of the second web (13) close to the first web (12).

3. The method for forming the middle beam according to claim 2, wherein, After removing the second acting force, the following steps are further included: Rotating the basic structure so that the bottom plate (11) is directly below the first web (12) and the second web (13); Applying a third acting force to the basic structure to deform the basic 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), and the chord height of the second arc shape is a second preset chord height; the second preset chord height is less than the limit upward deflection chord height; 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).

4. The method for forming the middle beam according to claim 3, wherein After positioning at least two of the sub-cover plate parts (141) by spot welding on the first web (12) and the second web (13), and along the direction of the arc extension of the second web (13) from the middle to both ends, before seam-welding at least two of the sub-cover plate parts (141) to the second web (13), the following steps are further included: While maintaining the third acting force, seam-weld the outer side of the first web (12) to the bottom plate (11), and seam-weld the outer side of the second web (13) to the bottom plate (11); Wherein, the outer side of the first web (12) is the side of the first web (12) away from the second web (13), and the outer side of the second web (13) is the side of the second web (13) away from the first web (12).

5. The method for forming the middle beam according to claim 3, characterized in that After seam-welding at least two of the sub-cover plate parts (141) to the second web (13), and before seam-welding at least two of the sub-cover plate parts (141) to the first web (12), the following steps are further included: Let the overall structure composed of the basic structure, the rib plate (15) and the cover plate (14) stand still for cooling; Remove the third acting force.

6. The method for forming a middle beam according to any one of claims 2-5, characterized in that, The specific steps of seam-welding a plurality of the rib plates (15) to the inner side of the first web (12) so that the plurality of the rib plates (15) are spaced apart along the arc extension direction of the first web (12) include: Divide the plurality of the rib plates (15) into two first sub-rib plate groups and two second sub-rib plate groups; Along the direction of the arc extension of the first web (12) from the middle to both ends, 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 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 make there be one second sub-rib plate (152) between any two adjacent first sub-rib plates (151).

7. The method for forming the middle beam according to any one of claims 1-5, characterized in that The specific steps of positioning at least two of the sub-cover plate parts (141) by spot welding on the first web (12) and the second web (13) include: Position the relative positions of the first web (12), the second web (13), and at least two of the sub-cover plate parts (141) such that at least two of the 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 such that in a direction perpendicular to the first web (12) and the second web (13), the first ends of the end faces approaching each other on any two adjacent sub-cover plate parts (141) contact the second web (13) at a first position (142). Spot-weld all of the at least two positioned sub-cover plate parts (141) to the first web (12) and the second web (13). Wherein, 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, each of the first positions (142) is spaced apart along the arc extension direction of the second web (13).

8. The method for forming a middle beam according to any one of claims 1-5, characterized in that: When seam-welding all of the at least two sub-cover plate parts (141) to the second web (13), rotate the basic structure such that the weld seam formed between the second web (13) and the at least two sub-cover plate parts (141) faces the top of the basic structure; and / or, When seam-welding all of the at least two sub-cover plate parts (141) to the first web (12), rotate the basic structure such that the weld seam formed between the first web (12) and the at least two sub-cover plate parts (141) faces the top of the basic structure.

9. The method for forming a middle beam according to any one of claims 1-5, characterized in that, The middle beam forming auxiliary device includes two positioners (2), and each positioner (2) is provided with a support plate (3); the positioner (2) can drive the support plate (3) to rotate around a fixed axis, and the support plate (3) is used to fix the installation position of the basic structure. The specific steps of rotating the basic structure such that the first web (12) is located directly below the second web (13) include: Lift and install the basic structure onto the support plates (3) of the two positioners (2), and fix the relative positions of the two ends in the length direction of the basic structure and the support plates (3) of the two positioners (2) in a one-to-one correspondence. Control the two positioners (2) to drive the corresponding support plates (3) to rotate synchronously around the 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).

10. The method for forming the middle beam according to claim 9, characterized in that, The auxiliary device for forming the middle beam further includes a base (4) and a cushion block. The two positioners (2) are arranged at intervals on both sides of the length direction of the base (4). The positioner (2) can also drive the pallet (3) to lift along its own height direction. The height direction of the positioner (2) is parallel to the height direction of the base (4). The cushion block includes a first cushion block (51), and the first cushion block (51) is detachably connected to the tabletop of the base (4). The specific steps of applying a first acting force to the basic structure to deform the basic structure into a first arc shape, and the center of the first arc shape is far from the first web (12) relative to the second web (13) include: Controlling the two positioners (2) to drive the corresponding pallets (3) to synchronously descend along their own height directions until the first web (12) is supported on the two first cushion blocks (51), and the two first cushion blocks (51) are respectively located inside the two ends of the first web (12) in the length direction; Applying the first acting force to the middle area in the length direction of the basic structure from top to bottom along the height direction of the base (4), so that the middle area in the length direction of the basic structure is bent downward to form the first arc shape, and the center of the first arc shape is far from the first web (12) relative to the second web (13).

11. The method for forming a middle beam according to claim 10, characterized in that, Along the height direction of the base (4), the maximum height of the first cushion block (51) is equal to the first preset chord height; When the middle area in the length direction of the basic structure abuts against the tabletop of the base (4) along the height direction of the base (4), the chord height of the first arc shape is the first preset chord height.

12. The middle beam includes a bottom plate (11), a first web (12), a second web (13) and a cover plate (14), characterized in that, The shapes and / or plate thicknesses of the first web (12) and the second web (13) are different, and the bottom plate (11), the first web (12), the second web (13) and the cover plate (14) are formed into a middle beam by using the middle beam forming method according to any one of claims 1-11.

13. The center beam according to claim 12, wherein, 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).

14. Auxiliary device for forming the middle beam, characterized in that For implementing the middle beam forming method according to any one of claims 1-11, the auxiliary device for forming the middle beam includes: Two positioners (2), each positioner (2) is provided with a pallet (3); the positioner (2) can drive the pallet (3) to rotate around a fixed axis, and the pallet (3) is used to fix the installation position of the basic structure; A force application unit for applying a force to the basic structure; A welding unit for spot welding the first web (12) and the second web (13) to the bottom plate (11) respectively, spot welding at least two sub-cover plate parts (141) to the first web (12) and the second web (13) respectively, seam welding the sub-cover plate parts (141) to the second web (13), and seam welding the sub-cover plate parts (141) to the first web (12).

15. The auxiliary device for forming the middle beam according to claim 14, wherein, The pallet (3) is provided with at least one first limiting unit and at least two second limiting units. At least one of the first limiting units can limit the basic structure above the plate surface of the pallet (3) along a first direction, and at least two of the second limiting units can limit the basic structure above the plate surface of the pallet (3) along a second direction. The first direction is perpendicular to the plate surface of the pallet (3), and the second direction is perpendicular to the spacing direction between the two positioners (2) and is perpendicular to the first direction.

Images