Assembly welding tool and process for end wall structure of railway vehicle

Abstract

The invention discloses an assembling and welding tool and process for an end wall structure of a railway vehicle. The assembling and welding tool comprises a tire outlet support, a mounting seat support and a plate beam assembly support. The number of the tire outlet supports is two, and the two tire outlet supports are arranged in parallel; the number of the installation seat supports is two, the two installation seat supports are arranged side by side, and the two installation seat supports are both provided with limiting pieces. The plate girder assembly support comprises a frame, the bottom of the frame is supported through four supporting legs, the frame comprises a left face, a right face and a rear face, continuous sliding rails are arranged on the upper portions and the lower portions of the three faces, a plurality of end wall supporting beams are arranged on the sliding rails, the end wall supporting beams can move on the sliding rails, and the end wall supporting beams can move on the sliding rails. And a positioning block is arranged at the top of each end wall supporting beam. According to the assembling and welding tool suitable for the front assembling process of the end wall structure of the rubber-tyred vehicle, assembling, welding, tire discharging and the like of the end wall structure can be achieved through the front assembling process mode.

Description

Technical Field

[0001] The invention belongs to the field of assembly welding of rubber-wheel vehicle parts, and in particular relates to an assembly welding tool and process for an end wall structure of a rail vehicle. Background Art

[0002] The statements herein merely provide background information related to the present invention and do not necessarily constitute prior art.

[0003] The inventor found that the spot-welded stainless steel end wall structure of a rail transit vehicle usually consists of wall panels, cross beams, columns, curved beam corner columns and some small parts, and the assembly welding process generally adopts a reverse assembly process (i.e. the wall panels are on the bottom). Unlike this type of rail transit vehicle, the end wall structure of a low-capacity rubber-wheeled vehicle has obvious structural changes, mainly reflected in the installation seat above the rubber wheel is integrated at the left and right positions of the door below the end wall (such as Figure 1 As shown in the figure, if the end wall reverse assembly process in the prior art is still used, it will bring great difficulties, because the mounting seat in the end wall structure of the rubber-wheeled vehicle is large in size, which cannot be achieved by using the end wall reverse assembly process, and the welding amount between the reinforcement plate and the wall panel at the mounting seat position is large, and the welding shrinkage is large during the plate beam spot welding stage, so the deformation control during the plate beam welding process is particularly critical. Summary of the invention

[0004] In view of the deficiencies in the prior art, the purpose of the present invention is to provide a welding tool and process for rubber-wheeled vehicle components, which can realize the assembly, welding, and tire production of the end wall structure of the rubber-wheeled vehicle.

[0005] In order to achieve the above object, the present invention is implemented through the following technical solutions: In a first aspect, an embodiment of the present invention provides a welding fixture for a rail vehicle end wall structure, including a tire exit support, a mounting seat support, and a plate beam assembly support; The tire ejection supports are provided with two, and the two tire ejection supports are arranged in parallel; The mounting seat supports are provided with two, the two mounting seat supports are arranged in parallel, and limiting members are provided on the two mounting seat supports; The plate beam support comprises a frame, the bottom of which is supported by four supporting legs. The frame comprises three surfaces, namely, left, right and rear surfaces. Continuous slide rails are arranged on the upper and lower parts of the three surfaces. A number of end wall support beams are arranged on the slide rails. The end wall support beams can move on the slide rails, and a positioning block is arranged on the top of each end wall support beam.

[0006] The welding tooling suitable for the positive assembly process of the end wall structure of a rubber-wheeled vehicle provided by the present invention can realize the assembly, welding, and tire removal of the end wall structure of the rubber-wheeled vehicle; the plate-beam component is supported by the plate-beam component support, and the two mounting seats are supported by the mounting seat support; and a tire removal support is provided to prevent the end wall from colliding with the bottom wall panel during the process of lifting out of the platform; the positive assembly of the end wall structure of the rubber-wheeled vehicle is realized through the mutual cooperation of the plate-beam component, the mounting seat support, and the tire removal support; and the plurality of end wall support beams in the present invention can be moved, thereby avoiding welding points, which is convenient for the welding operation of the spot welding equipment.

[0007] As a further technical solution, the end wall support beam is a right-angled triangle structure, the upper part of which is slidably connected to the upper slide rail, and the lower part of which is slidably connected to the lower slide rail.

[0008] As a further technical solution, the two mounting seat supports are arranged between the tire exit support and the plate beam component support.

[0009] As a further technical solution, it also includes a beam-column positioning mold, which includes a first positioning plate, and a first rivet nut positioning hole is arranged on the first positioning plate; the beam-column positioning mold controls the welding deformation of the beams, columns and wall panels.

[0010] As a further technical solution, the first rivet nut positioning hole is connected to a beam column composed of a plate beam in the end wall structure.

[0011] As a further technical solution, it also includes a door size control template, which includes a second positioning plate, and a second rivet nut positioning hole is arranged on the second positioning plate; the door size control template controls the welding deformation of the reinforcement plate and the wall panel.

[0012] As a further technical solution, the second rivet nut positioning hole is connected to a reinforcing plate composed of plate beams in the end wall structure.

[0013] In a second aspect, an embodiment of the present invention further provides a welding process for the end wall structure of a rubber-wheeled vehicle, which is as follows: Step 1. Weld the wall panels, reinforcement plates, beams and columns together to form a plate-beam assembly; Step 2. The mounting seat is hoisted to the mounting seat support of the welding fixture, and the limit piece plays the role of positioning the mounting seat; Step 3. The bent beam and corner column are hoisted to the end wall support beam of the welding fixture, and the positioning block plays the role of positioning the plate beam assembly; Step 4. Lift the plate-beam assembly onto the curved beam corner column assembly, and position it in such a way that the edge of the wall panel of the plate-beam assembly is at a set distance from the facade of the curved beam corner column assembly; Step 5. Use spot welding equipment to weld the mounting base assembly, plate beam assembly, and bent beam corner column assembly into a whole. During the process of spot welding the plate beam assembly and the bent beam corner column assembly, move the end wall support beam for the welding points where the tooling and welding clamps interfere to achieve welding of the welding points.

[0014] As a further technical solution, during the welding process in step 1, the welding deformation of the reinforcing plate and the wall panel is controlled by controlling the template of the door size.

[0015] As a further technical solution, during the welding process in step 1, the welding deformation of the beams, columns and wall panels is controlled by using a beam-column positioning template.

[0016] The beneficial effects of the above embodiments of the present invention are as follows: 1. The welding fixture provided by the present invention is suitable for the assembly process of the end wall structure of a rubber-wheeled vehicle. The welding fixture can realize the assembly, welding, and tire removal of the end wall structure of such a rubber-wheeled vehicle; the plate-beam component is supported by the plate-beam component support, and the two mounting seats are supported by the mounting seat support; and a tire removal support is provided to prevent the end wall from hitting the bottom wall panel during the process of lifting out of the platform; the assembly of the end wall structure of the rubber-wheeled vehicle is realized through the mutual cooperation of the plate-beam component, the mounting seat support, and the tire removal support; and the plurality of end wall support beams in the present invention can be moved, thereby avoiding welding points, which is convenient for the welding operation of the spot welding equipment.

[0017] 2. The present invention adds welding deformation control means during the spot welding stage of the wall panels and beams and columns, that is, adding beam and column positioning templates and door size control templates to ensure the size of the end wall through-passage eyelets and the door size. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The accompanying drawings in the specification, which constitute a part of the present invention, are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute improper limitations on the present invention.

[0019] Figure 1 is a schematic diagram of the end wall structure of the present invention; Figure 2 It is a schematic diagram of the plate-beam composition in the end wall structure of the present invention; Figure 3 It is a structural schematic diagram of the welding tool of the present invention; Figure 4 is a schematic diagram of an end wall support beam in the present invention; Figure 5 It is a schematic diagram of the state in which the end wall structure of the present invention is placed on the welding tool for welding; Figure 6 It is a schematic diagram of the beam-column positioning model in the present invention; Figure 7It is a schematic diagram of the door size control template in the present invention; Figure 8 It is a schematic diagram of the beam and column positioning method and door size control in the present invention; In the figure: the distances or sizes between parts are exaggerated to show the positions of various parts, and the schematic diagram is for illustration only.

[0020] 1. Plate-beam composition; 1-1. Wall panel; 1-2. Reinforcement plate; 1-3. Beam-column composition; 2. Mounting seat; 3. Spring seat; 4. Bent beam-corner column composition; 10. Assembly welding tool; 11. Exit support; 12. Mounting seat support; 13. Support leg; 14. Positioning block composed of curved beam and corner column; 15. Slide rail; 16. End wall support beam; 17. Frame; 18. Mounting seat limiter; 16-1. Upper slider; 16-2. Lower slider; 16-3. Connecting plate; 16-4 Horizontal support rod; 16-5 Diagonal tie rod; 15-1. Upper slide rail; 15-2. Lower slide rail; 20. Beam-column positioning template; 20-1. First positioning plate; 20-2. First rivet nut positioning hole; 21. Door size control template; 21-1. Second positioning plate; 21-2. Second rivet nut positioning hole; DETAILED DESCRIPTION It should be noted that the following detailed descriptions are illustrative and intended to provide further explanation of the present invention. Unless otherwise specified, all technical and scientific terms used in the present invention have the same meanings as those commonly understood by those skilled in the art to which the present invention belongs.

[0021] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present invention. As used herein, unless otherwise explicitly stated in the present invention, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "include" and / or "include" are used in this specification, it indicates the presence of features, steps, operations, devices, components and / or combinations thereof; For the convenience of description, if the words "up", "down", "left" and "right" appear in the present invention, they only indicate that they are consistent with the up, down, left and right directions of the drawings themselves, and do not limit the structure. They are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it cannot be understood as a limitation on the present invention.

[0022] Glossary: ​​The end wall structure assembly process in the present invention refers to the process of gradually assembling from the basic components according to the design sequence and finally completing the assembly process of the end wall structure; specifically, first complete the welding of the plate beam component 1, and then weld the plate beam component 1 and the bent beam corner column component 4, and the plate beam component 1 and the mounting seat 2 to form the end wall structure; then, install the end wall structure in the body of the rail vehicle.

[0023] As described in the background technology, the mounting base above the rubber wheel is integrated at the left and right positions of the doorway below the end wall (such as Figure 1 As shown in the figure, if the end wall reverse assembly process in the prior art is still used, it will bring great difficulties, because the size of the mounting seat in the end wall structure of the rubber-wheeled vehicle is large, and the end wall reverse assembly process cannot be used, and the welding amount of the reinforcing plate and the wall panel at the mounting seat position is large, and the welding shrinkage is large during the plate beam spot welding stage, and the deformation control of the plate beam assembly welding process is particularly critical. In order to solve the above technical problems, the present invention proposes a welding tool and process for rubber-wheeled vehicle components.

[0024] In a typical embodiment of the present invention, Figure 1 , Figure 2 As shown, it is a schematic diagram of the end wall structure of an existing rubber-wheeled vehicle, which includes a plate beam component 1, a mounting seat 2 and a bent beam corner column component 4, wherein a mounting seat 2 is respectively arranged at the left and right positions of the doorway below the plate beam component 1; a spring seat 3 is arranged on the mounting seat 2; wherein the plate beam component 1 includes a wall panel 1-1, a reinforcement plate 1-2, and a beam-column component 1-3; the plate beam component 1 and the bent beam corner column component 4 are welded together.

[0025] In order to realize the assembly welding of the end wall structure of the rubber-wheeled vehicle, the assembly welding tool 10 disclosed in this embodiment is as follows Figure 3 , Figure 4 , Figure 5 As shown, it includes: a tire support 11, a mounting seat support 12 and a plate beam support; the tire support 11, the mounting seat support 12 and the plate beam support are independently arranged, but have a certain positional relationship, and the mounting seat support 12 is located between the tire support 11 and the plate beam support; through the mutual cooperation of the plate beam, the mounting seat support and the tire support, the positive assembly of the end wall structure of the rubber-wheeled vehicle is realized; the specific structure and positional relationship of the tire support 11, the mounting seat support 12 and the plate beam support are described below: In this embodiment, two tire ejection supports 11 are provided, and the two tire ejection supports 11 are arranged in parallel; the tire ejection supports are used to support the spring seat 3 during tire ejection; In this embodiment, two mounting seat supports 12 are provided, and the two mounting seat supports 12 are arranged in parallel. The two mounting seat supports 12 are provided with mounting seat limit strips 18; the mounting seat supports 12 support the two mounting seats; the mounting seat supports 12 are located between the tire support 11 and the plate beam component support; In this embodiment, the plate beam component support includes support legs 13, curved beam corner column component positioning blocks 14, slide rails 15, end wall support beams 16 and frames 17. The plate beam component support supports the plate beam component. The bottom of the frame 17 in the plate beam component support is supported by four support legs 13. The frame 17 includes three left, right and rear surfaces (the surface close to the mounting seat support 12 is not provided). Continuous slide rails 15 (corresponding upper slide rails 15-1 and lower slide rails 15-2) are provided on the upper and lower parts of the left, right and rear surfaces. A number of independently arranged end wall support beams 16 are provided on the upper slide rails 15-1 and the lower slide rails 15-2. The several independently arranged end wall support beams 16 can move on the upper slide rails 15-1 and the lower slide rails 15-2. A positioning block 14 is provided on the end wall support beam 16; the purpose of moving the end wall support beams 16 is mainly to avoid welding spots and facilitate welding operations of spot welding equipment; that is, in this embodiment, the plate beam component is supported by the plate beam component support, and the two mounting seats are supported by the mounting seat support; and a tire release support is provided to prevent the end wall from hitting the bottom wall panel during the process of lifting out of the platform; the positive assembly of the end wall structure of the rubber-wheeled vehicle is achieved through the mutual cooperation of the plate beam component, the mounting seat support, and the tire release support; the welding tooling suitable for the positive assembly process of the end wall structure of the rubber-wheeled vehicle provided in this embodiment can realize the assembly, welding, and tire release of the end wall structure of this rubber-wheeled vehicle.

[0026] Furthermore, there is a certain distance between the two tire ejection supports 11, and the tire ejection supports 11 are two support columns arranged at a certain distance, wherein the height of the support column needs to be slightly higher than Figure 1 The distance from the spring seat 3 on the middle mounting seat 2 to the bottom of the end wall is also determined by Figure 1 The distance between the two spring seats 3 of the two mounting seats 2 is determined; the role of the two tire supports 11 is to prevent the end wall from hitting the bottom wall panel during the lifting process. Finally, the two tire supports 11 are used to support Figure 1 Spring seat 3 in.

[0027] Furthermore, there is a certain distance between the two mounting seat supports 12. The two mounting seat supports 12 are arranged symmetrically. The distance between the two mounting seat supports 12 is based on Figure 1 The design dimensions of the two mounting seats 2 are determined.

[0028] Furthermore, the two mounting seat supports 12 are used to install the mounting seat 2 of the end wall structure; the limiting strips 18 thereon limit the mounting seat 2 to ensure the installation accuracy of the two mounting seats 2; specifically, in this embodiment, the limiting strips 18 on the mounting seat supports 12 include two L-shaped limiting strips, and the two L-shaped limiting strips are positioned according to the end face shape of the mounting seat.

[0029] Further, two mounting seat supports 12 are arranged between the support leg 13 and the tire support 11; there is also a certain distance between the mounting seat support 12 and the support leg 13 and the tire support 11; the two mounting seat supports 12 are arranged in parallel between the tire support 11 and the support leg 13. Specifically, the distance between the mounting seat support 12 and the tire support 11 is determined by: Figure 1 The bottom of the two mounting seats 2 is a reversing axis to ensure that after lifting Figure 1 The spring seats of the two mounting seats 2 fall onto the tire support 11; the spacing between the mounting seat support 12 and the support leg 13 is determined according to the design size of the end wall product.

[0030] As a further technical solution, a plate beam component 1 is placed on the frame 17 and the end wall support beam 16 in this embodiment; wherein the end wall support beam 16 is mainly used to place the bent beam corner column component 4, and the positioning block 14 positions the bent beam corner column component 4.

[0031] As a further technical solution, Figure 4 As shown, the end wall support beam 16 in this embodiment is a direct triangular structure, the upper part of which is slidably connected to the upper slide rail, and the lower part is slidably connected to the lower slide rail, specifically including an upper slider 16-1 and a lower slider 16-2, the upper slider 16-1 and the lower slider 16-2 are connected by a vertically arranged connecting plate 16-3, the upper slider 16-1 can slide along the upper slide rail 15-1, and the lower slider 16-2 can slide along the upper slide rail 15-2, a horizontal support rod 16-4 is arranged on the top of the connecting plate 16-3, and the horizontal support rod 16-4 is connected to the vertically arranged connecting plate through a diagonal rod 16-5; a positioning block 14 is arranged on the horizontal connecting rod 16-4; the end wall support beam 16 adopts this structural form, the overall support effect is good, the stability is good, and it can also be flexibly moved.

[0032] As a further technical solution, in order to realize the assembly of the plate beam assembly 1 and improve the welding quality of the plate beam assembly 1, the present embodiment further discloses a beam column positioning mold 20, that is, the assembly welding tool also includes the beam column positioning mold 20, such as Figure 6 As shown, the beam-column positioning template 20 includes a first positioning plate 20-1, on which a first rivet nut positioning hole 20-2 is arranged; the first positioning plate 20-1 is an irregular stainless steel plate, on one of the long sides and two short sides of the stainless steel plate, a first rivet nut positioning hole 20-2 is arranged, and the other long side is bent to one side by 90°; the first rivet nut positioning hole 20-2 is connected to the beam 1-3, and the specific use state is as shown in FIG. Figure 8 As shown, it is installed at the beam column position of the wall panel 1-1 to position the welding of the beam column and the wall panel.

[0033] As a further technical solution, in order to realize the assembly of the plate beam assembly 1 and improve the welding quality of the plate beam assembly 1, the present embodiment further discloses a door size control template 21, that is, the assembly welding tool also includes a door size control template, such as Figure 7 As shown, the door size control master mold 21 includes a second positioning plate 21-1, and a second rivet nut positioning hole 21-2 is set on the second positioning plate 21-1; the second positioning plate 21-1 is a rectangular stainless steel plate, and the second rivet nut positioning holes 21-2 are set on the two short sides of the stainless steel plate, and the two long sides are bent 90° to the same side. The second rivet nut positioning hole 21-2 is connected to the reinforcement plate 1-2. The specific use state is as shown in FIG. Figure 8 As shown, the door size control template 21 is set at the two reinforcing plates 1-2 to control the size of the welding at this position.

[0034] The method of welding the end wall structure by using the welding tool can be seen in the following figure. Figure 5 ,as follows: Step 1. First, use the door size control template 21 and the beam column positioning template 20 to weld the wall panel 1-1, the reinforcement plate 1-2, and the beam column assembly 1-3 together to form a plate beam assembly 1; Step 2. Figure 1 The mounting seat 2 in the assembly is hoisted to the mounting seat support 12 of the assembly welding tool, and the limiting strip 18 on the mounting seat support 12 plays the role of limiting and positioning the mounting seat 2; Step 3. Figure 2 The middle curved beam corner column assembly 4 is hoisted to the end wall support beam 16 of the assembly welding fixture, and the positioning block 14 plays a role in positioning the curved beam corner column assembly 4; Step 4. Lift the plate-beam component 1 obtained in step 1 to the curved beam corner column component 4, and position it in such a way that the edge of the wall panel of the plate-beam component is 10 mm (reference value) away from the facade of the curved beam corner column component 4; Step 5. Use spot welding equipment to weld the plate beam component 1 and the bent beam corner column component 4 together to form a whole. During the spot welding process of the plate beam component and the bent beam corner column component, the end wall support beam 16 needs to be moved for the welding points where the tooling and welding clamps interfere to achieve the welding of the welding points.

[0035] Furthermore, during the welding process in step 1, the door size control template is used to control the size of the welding of the reinforcement plate 1-2; the beam-column positioning template 20 is used to control the size of the welding of the beam-column composition 1-3; that is, welding deformation control measures are added during the spot welding stage of the wall panels and beams and columns, that is, the beam-column positioning template and the door size control template are added to ensure the size of the end wall through-passage eyelet and the door size.

[0036] During the above-mentioned welding process, the plate-beam assembly is supported by the plate-beam assembly support, and the two mounting seats are supported by the mounting seat support; and a tire release support is provided to prevent the end wall from hitting the bottom wall panel during the process of lifting out of the platform; the positive assembly of the end wall structure of the rubber-wheeled vehicle is achieved through the mutual cooperation of the plate-beam assembly, the mounting seat support, and the tire release support; the welding tooling suitable for the positive assembly process of the end wall structure of the rubber-wheeled vehicle provided in this embodiment can realize the assembly, welding, and tire release of the end wall structure of this rubber-wheeled vehicle.

[0037] Finally, it should be noted that relational terms such as first and second are merely used to distinguish one entity or operation from another entity or operation, but do not necessarily require or imply any actual relationship or order between these entities or operations.

[0038] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A welding tool for the end wall structure of a railway vehicle, characterized in that: Including tire support, mounting seat support, plate beam support; The tire ejection supports are provided with two, and the two tire ejection supports are arranged in parallel; The mounting seat supports are provided with two, the two mounting seat supports are arranged in parallel, and limiting members are provided on the two mounting seat supports; The plate beam support comprises a frame, the bottom of the frame is supported by supporting legs, the frame comprises three surfaces, namely left, right and rear, continuous slide rails are arranged on the upper and lower parts of the three surfaces, a number of end wall support beams are arranged on the slide rails, the number of end wall support beams can move on the slide rails, and a positioning block is arranged on the top of each end wall support beam.

2. The assembly welding tool for the rail vehicle end wall structure according to claim 1, characterized in that: The end wall support beam is a right-angled triangle structure, the upper part of which is slidably connected to the upper slide rail, and the lower part of which is slidably connected to the lower slide rail.

3. The assembly welding tool for the rail vehicle end wall structure according to claim 1, characterized in that: The two mounting seat supports are arranged between the tire exit support and the plate beam component support.

4. The assembly welding tool for the rail vehicle end wall structure according to claim 1, characterized in that: It also includes a beam-column positioning mold, which includes a first positioning plate, and a first rivet nut positioning hole is arranged on the first positioning plate.

5. The assembly welding tool for the rail vehicle end wall structure according to claim 4, characterized in that: The first rivet nut positioning hole is connected to the beam column composed of the plate beam in the end wall structure.

6. The assembly welding tool for the rail vehicle end wall structure according to claim 1, characterized in that: The door size control template is also included, and the door size control template includes a second positioning plate, and a second rivet nut positioning hole is arranged on the second positioning plate.

7. The assembly welding tool for the rail vehicle end wall structure according to claim 6, characterized in that: The second rivet nut positioning hole is connected to the reinforcing plate composed of the plate beam in the end wall structure.

8. A process for welding the end wall structure of a rubber-tyred vehicle using the welding tool for the end wall structure of a rail vehicle according to any one of claims 1 to 7, characterized in that: Step 1. Weld the wall panels, reinforcement plates, beams and columns together to form a plate-beam assembly; Step 2. The mounting seat is hoisted to the mounting seat support of the welding fixture, and the limit piece plays the role of positioning the mounting seat; Step 3. The bent beam and corner column are hoisted to the end wall support beam of the welding fixture, and the positioning block plays the role of positioning the plate beam assembly; Step 4. Lift the plate-beam assembly onto the curved beam corner column assembly, and position it in such a way that the edge of the wall panel of the plate-beam assembly is at a set distance from the facade of the curved beam corner column assembly; Step 5. Use spot welding equipment to weld the mounting base assembly, plate beam assembly, and bent beam corner column assembly into a whole. During the process of spot welding the plate beam assembly and the bent beam corner column assembly, move the end wall support beam for the welding points where the tooling and welding clamps interfere to achieve welding of the welding points.

9. The welding process according to claim 8, characterized in that: During the welding process in step 1, the welding deformation of the reinforcing plate and the wall panel is controlled by controlling the template of the door size.

10. The welding process according to claim 8, characterized in that: During the welding process in step 1, the welding deformation of the beams, columns and wall panels is controlled by the beam-column positioning template.

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