Tensioning roller support bracket and method of manufacturing the same

Abstract

A tensioning roller support frame includes a main vertical plate, a left end plate, a right end plate, an upper panel, a lower panel, two triangular plates, a cover plate, a transverse rib plate, and a vertical rib plate. The left side of the main vertical plate is welded to the left end plate, the right side of the main vertical plate is welded to the right end plate, the upper end of the main vertical plate is welded to the upper panel, and the lower end of the main vertical plate is welded to the lower panel. One right-angled side of the triangular plate is welded to the lower panel, and the other right-angled side of the triangular plate is welded to the left end plate or the right end plate. The hypotenuse of the triangular plate is welded to the cover plate. The transverse rib plate and the vertical rib plate are welded to the inner and outer side surfaces of the main vertical plate. The main vertical plate includes a first steel plate, a second steel plate, a third steel plate, and a fourth steel plate. The lower end of the first steel plate is welded to the upper end of the second steel plate, the right end of the second steel plate is welded to the left end of the third steel plate, the upper end of the third steel plate is welded to the lower end of the fourth steel plate, and the lower end of the fourth steel plate is engaged in a groove. The present invention also provides a method for preparing a tensioning roller support frame.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of large steel structure manufacturing, and particularly relates to a tensioning roller support frame and a preparation method thereof. BACKGROUND

[0002] The displacement belt conveyor is a continuous conveying and loading-unloading equipment with high efficiency, good usability and maneuverability. The displacement belt conveyor is laterally or fan-shaped displaced according to the advancing of a working face or a dumping working face. The equipment has no fixed base and is composed of a head station, a tail station and an intermediate mechanism. The steel structure of the head station is composed of a driving part, a transmission roller, a redirection roller, a head frame and other main load-bearing structures and auxiliary steel structures. The head station needs to meet the use requirements in the extreme temperature environment, and the structural performance requirements are very high. The head frame is composed of more than 50 components, mainly including a head station skid, a front main stand, a rear main stand, a tensioning roller support frame, a head roller mounting bracket, an unloading chute, a hopper, a platform, a handrail, a ladder and the like.

[0003] The tensioning roller support frame is a key support large steel structure part of the head frame of the head station, which is a core component of the displacement belt conveyor. Two tensioning roller support frames jointly bear the tensioning roller. Specifically, the left end surface of the tensioning roller support frame is connected with the rear main stand, the right end surface is connected with the front main stand, and the upper surface is provided with the tensioning roller, which is a main load-bearing component. In order to improve the bearing capacity of the tensioning roller support frame, the inner side and the outer side of the tensioning roller support frame are further provided with reinforcing ribs. The left end surface, the right end surface and the upper surface of the tensioning roller support frame are machining surfaces, and the machining surfaces have high precision requirements for flatness, perpendicularity, straightness and outer dimensions. Meanwhile, the size of the tensioning roller support frame is very large, generally about 20 meters in length, 4-6 meters in height and 1 meter in width. If the tensioning roller support frame adopts a rod body connection form, the support strength thereof is difficult to meet the actual requirements. If the tensioning roller support frame is welded by steel plates, since the size of the tensioning roller support frame is very large and exceeds the general size of the steel plates, the tensioning roller support frame needs to be spliced by multiple steel plates. However, a large number of welds will seriously affect the support strength of the tensioning roller support frame. Meanwhile, the welding deformation of the steel plates is not easy to control. In order to meet the strength requirements of the tensioning roller support frame, the quality grade of the welds also needs to be high. During the welding process, the workpiece has a large span size, and the lifting is not easy to control, so the production and manufacturing are difficult. SUMMARY

[0004] Therefore, it is necessary to provide a tensioning roller support frame which is easy to process and has a support strength meeting the requirements.

[0005] It is also necessary to provide a preparation method of the tensioning roller support frame, which is easy to control the welding deformation and has high weld quality.

[0006] The tensioning roller support frame comprises a main vertical plate, a left end plate, a right end plate, an upper panel, a lower panel, two triangular plates, a cover plate, a horizontal rib plate and a vertical rib plate. The left side of the main vertical plate is welded with the left end plate, the right side of the main vertical plate is welded with the right end plate, the upper end of the main vertical plate is welded with the upper panel, and the lower end of the main vertical plate is welded with the lower panel. One of the right angles of the triangular plate is welded with the lower panel, the other right angle of the triangular plate is welded with the left end plate or the right end plate, and the inclined edge of the triangular plate is welded with the cover plate. The horizontal rib plate and the vertical rib plate are welded with the inner side and the outer side of the main vertical plate. The main vertical plate comprises a first steel plate, a second steel plate, a third steel plate and a fourth steel plate. The lower end of the first steel plate is welded with the upper end of the second steel plate, the right end of the second steel plate is welded with the left end of the third steel plate, and the second steel plate and the third steel plate are provided with a convex platform which is engaged with each other, so that the weld of the second steel plate and the third steel plate is S-shaped. The upper end of the third steel plate is welded with the lower end of the fourth steel plate, and the upper end of the third steel plate is provided with a groove, and the lower end of the fourth steel plate is engaged in the groove.

[0007] The preparation method of the tensioning roller support frame comprises the following steps:

[0008] Step S1: splicing and welding the main vertical plate; the following three steps are performed:

[0009] Step S101: the lower end of the first steel plate and the upper end of the second steel plate are combined and spliced and welded to form a first assembly;

[0010] Step S102: the upper end of the third steel plate and the lower end of the fourth steel plate are combined and spliced and welded to form a second assembly;

[0011] Step S103: the right side of the first assembly and the left side of the second assembly are combined and spliced and welded to form the main vertical plate;

[0012] Step S2: splicing and welding each assembly of the outer side of the main vertical plate:

[0013] The main vertical plate is horizontally fixed on a work platform. The upper end surface and the left end surface of the main vertical plate are used as the reference, and the horizontal rib plate, the vertical rib plate and the roller support are sequentially welded from left to right on the outer side of the main vertical plate by skip welding;

[0014] Step S3: splicing and welding each assembly of the upper panel, the lower panel, the left end plate, the right end plate and the inner side of the main vertical plate by full welding, which is performed in the following steps:

[0015] Step S301: the main vertical plate is turned over and positioned and raised to be horizontally placed;

[0016] Step S302: the main vertical plate is spliced and welded with the upper panel, and a temporary lifting lug is welded on the upper panel;

[0017] Step S303: the horizontal rib plate and the vertical rib plate are sequentially welded from left to right on the inner side of the main vertical plate with the upper end surface and the left end surface of the main vertical plate as the reference.

[0018] Step S304, welding the main vertical plate to the lower panel, the left end plate, and the right end plate;

[0019] Step S305: welding one triangular plate to the lower panel and the left end plate, and welding another triangular plate to the lower panel and the right end plate;

[0020] Step S4: Flip the main vertical plate for the second time, assemble and weld the high vertical ribs on the outer side, weld the remaining welds of the transverse rib plate, vertical rib plate, and roller support on the outer side of the main vertical plate, and weld the outer welds of the upper panel, lower panel, left end plate, right end plate, and triangle plate.

[0021] Beneficial effects: The present invention divides the tensioning roller support frame into a main vertical plate, a left end plate, a right end plate, an upper panel, a lower panel, two triangular plates, a cover plate, a transverse rib plate, and a vertical rib plate according to the purpose and stress characteristics of the tensioning roller support frame. Among them, the main vertical plate plays the main load-bearing role, the left end plate is used to connect the rear main column, the right end plate is used to connect the front main column, the upper panel is used to install the tensioning roller, and the triangular plate, the transverse rib plate, and the vertical rib plate play the role of strengthening the support. While saving manufacturing materials, the support strength meets the use requirements. The main vertical plate is divided into four pieces for welding, which solves the problem that the main vertical plate cannot be cut out due to the small size of a single steel plate. The weld between the second steel plate and the third steel plate is S-shaped, and a groove is provided at the upper end of the third steel plate. In this way, the main vertical plate of the present invention has significantly improved support strength compared with the main vertical plate welded flush. At the same time, the upper panel and the lower panel of the present invention can play a good protective role against the deformation of the weld between the second steel plate and the third steel plate; the left end plate can play a good protective role against the deformation of the weld between the first steel plate and the second steel plate; and the right end plate can play a good protective role against the deformation of the weld between the third steel plate and the fourth steel plate.

[0022] The preparation method of the tensioning roller support frame of the present invention first performs jump welding on the transverse ribs and the vertical ribs on the outer side, and then fully welds the transverse ribs and the vertical ribs on the inner side after turning over. After the second turning over, the transverse ribs and the vertical ribs on the outer side are repaired and welded. When welding the inner side, the main vertical plate and the inner side of the surrounding panels or end plates are first welded, and then the outer side is repaired and welded after turning over. In this way, the heat of the weld is easily dissipated during the step-by-step welding process, the workpiece is quickly set, and deformation is not easy to occur. At the same time, since the main vertical plate accounts for the main weight of the support frame, the difficulty of carrying the main vertical plate is effectively reduced by dividing the main vertical plate into four pieces. After that, a temporary lifting lug is installed on the upper panel. The main vertical plate is also convenient for lifting after welding. After assembly is in place, the temporary lifting lug can be removed. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is a schematic diagram of the three-dimensional structure of the tensioning roller support frame of the present invention.

[0024] Figure 2 This is a front view of the tensioning roller support frame of the present invention.

[0025] Figure 3 It is a structural schematic diagram of the main vertical plate of the present invention.

[0026] In the figure: main vertical plate 1, first steel plate 11, second steel plate 12, third steel plate 13, fourth steel plate 14, left end plate 2, right end plate 3, upper panel 4, lower panel 5, triangular plate 6, cover plate 7, transverse rib plate 8, and vertical rib plate 9. DETAILED DESCRIPTION

[0027] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following is a brief introduction to the drawings required for use in the embodiments. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0028] The directions "up," "down," "left," and "right" mentioned herein are relative to the positions in the diagram. The outer and inner sides mentioned herein are relative to the tension roller support frames. When assembling the headstock, two parallel tension roller support frames are required for support. The side of the two tension roller support frames facing each other is the inner side, and the side of the two tension roller support frames facing away from each other is the outer side.

[0029] Please see Figures 1 to 3 The tensioning roller support frame includes a main vertical plate 1, a left end plate 2, a right end plate 3, an upper panel 4, a lower panel 5, two triangular plates 6, a cover plate 7, a transverse rib plate 8, and a vertical rib plate 9. The left side of the main vertical plate 1 is welded to the left end plate 2, the right side of the main vertical plate 1 is welded to the right end plate 3, the upper end of the main vertical plate 1 is welded to the upper panel 4, and the lower end of the main vertical plate 1 is welded to the lower panel 5. One right-angled side of the triangular plate 6 is welded to the lower panel 5, and the other right-angled side of the triangular plate 6 is welded to the left end plate 2 or the right end plate 3. The oblique side of the triangular plate 6 is welded to the cover plate 7, and the transverse rib plate 8 and the vertical rib plate 9 are welded to the main vertical plate 1. The inner and outer sides are welded, and the main vertical plate 1 includes a first steel plate 11, a second steel plate 12, a third steel plate 13, and a fourth steel plate 14. The lower end of the first steel plate 11 is welded to the upper end of the second steel plate 12, and the right end of the second steel plate 12 is welded to the left end of the third steel plate 13. The second steel plate 12 and the third steel plate 13 are provided with mutually engaged bosses, so that the weld between the second steel plate 12 and the third steel plate 13 is S-shaped, and the upper end of the third steel plate 13 is welded to the lower end of the fourth steel plate 14. The upper end of the third steel plate 13 is provided with a groove, and the lower end of the fourth steel plate 14 is engaged in the groove.

[0030] The main stand plate 1 of the present application plays the role of the main body bearing. The left side of the main stand plate 1 is welded with the left end plate 2, specifically, vertical welding, and the width of the support frame is one meter, so the width of the left end plate 2 is also one meter. The left end plate 2 is used to connect the rear main stand column. The right end plate 3, the upper plate 4 and the lower plate 5 are also vertically welded with the main stand column and the width is one meter. The rear main stand column and the front main stand column are connected with the base of the head frame, and the width is relatively narrow, so it is easy to stress concentration at the connection with the tension roller support frame of the present application. By setting the triangular plate 6, the problem of stress concentration can be effectively improved. The cross rib plate 8 and the vertical rib plate 9 play the role of improving the support strength of the main stand plate 1.

[0031] If the main stand plate 1 is cast, it can be integrally formed. However, the mechanical properties of the cast part are poor, which cannot meet the use requirements of the head frame. At the same time, due to the very large size of the workpiece, the casting difficulty will also be significantly improved, so the steel plate used in the main stand plate 1 of the present application is a rolled part. As a rolled part, the size of the steel plate is limited by the rolling mill and transportation, and is generally rectangular and limited in size. The main stand plate 1 of the present application is welded by multiple steel plates, which overcomes the problem of size limitation of the steel plate. There are many problems to consider in the butt welding of multiple steel plates. For example, the complexity of welding, the support strength of the butt-welded main stand plate 1, etc. The main stand plate 1 of the present application is divided into four parts, and the weld between the second steel plate 12 and the third steel plate 13 is S-shaped, and the upper end of the third steel plate 13 is provided with a groove. The main stand plate 1 formed by butt welding is uniformly stressed, and the weld can avoid bearing too much pressure, which can cause the main stand plate 1 to break at the weld.

[0032] In view of the fact that the tension roller support frame of the present application is in an overhead state during use, and the main bearing is also in the middle section, and the weld between the assembly 1 and the assembly 2 is also in the middle section, the weld between the assembly 1 and the assembly 2 is a weak position under stress. In the process of long-term stress, this place is prone to fatigue fracture and other problems. The following will prove that the S-shaped weld of the present application has better mechanical properties than the flush weld through a comparative experiment. At the same time, due to the very large size of the workpiece itself, the time spent in production is relatively long, in order to reduce the experimental cost and difficulty, the size of the workpiece is reduced by 10 times in the experiment.

[0033] Among them, the welding method adopted by the control group is to cut out a main stand plate with the same shape and the same proportion from a whole steel plate first, then cut it in half vertically from the middle of the main stand plate, and then weld it to form a flush weld. The experimental group is the main stand plate of the present application which is reduced by 10 times in proportion.

[0034] The experimental items include tensile strength, compressive strength, fatigue strength, bending strength and shear strength. The experimental results are shown in Table 1:

[0035] Control group Experimental group Tensile strength (MPa) 545 613 Compressive strength (MPa) 353 355 Fatigue strength (MPa) 236 273 Bending strength (MPa) 576 625 Shear strength (MPa) 538 596

[0036] The above experimental results show that the main column of the S-shaped weld of the present application has better mechanical properties than conventional welds, especially in the properties of tensile strength, fatigue strength and shear strength. The upper support frame has a tensioning roller and a tensioning belt, and under the action of the tensioning belt, the tensioning roller support frame bears a large tensile force in the horizontal direction, and under the action of vibration, the weld is prone to fatigue fracture during long-term operation. At the same time, the weld bears different pressures on the left and right sides, and is therefore prone to bearing a large shear stress due to uneven stress. The tensile strength, fatigue strength and shear strength of the S-shaped weld of the present application are higher than the shear strength of the butt weld, which means that the service life can be prolonged.

[0037] The S-shaped weld of the second steel plate 12 and the third steel plate 13 is more accurately a "vertical" → "horizontal" → "vertical" form of weld. For the second steel plate 12 or the third steel plate 13, it is very convenient to cut or weld. In a preferred embodiment, the weld of the second steel plate 12 and the third steel plate 13 is rounded at the corners. In this way, stress concentration at the corners can be avoided. Since the size of the tensioning roller support frame of the present application is very large, weld deformation is prone to occur, and the quality requirement for the weld is relatively high. Therefore, the present application also provides a method for preparing a tensioning roller support frame. At the same time, before work, the workers need to be trained to ensure that the construction personnel are familiar with the process manufacturing technical procedures, safety operation procedures, quality requirements and other contents. In order to meet the requirements of the welding operation, a group welding device operation platform with a size of 18000mm x 2500mm is also made, and the flatness of the operation platform is ≤3mm. The welding process is carried out on the operation platform.

[0038] In a preferred embodiment, the welding adopts gas shielded arc welding (Ar80% + CO220%), the wire type is ER50-6, and the diameter is φ1.2mm. The welding parameters are: welding current 230-260A, welding voltage: 23-29V, welding speed: 350-450mm / min. The number of welders: 2.

[0039] After each welding is completed, the theodolite is used to measure the flatness and twist of the workpiece as a whole, and the next welding can be carried out only after the requirements are met. During the welding process of the workpiece, the workpiece should not be moved. The seam shape should be uniform, and there should be no defects such as cracks, unfused, slag inclusion, welding tumor, undercut, crater, needle-shaped porosity, etc. The butt weld should meet the requirements of the second grade of weld quality. During the welding process, the previous weld is inspected before each layer of welding is applied. If there are defects, the defects need to be treated and re-welded until the inspection is qualified before welding.

[0040] If there is a weld defect in the welding process, the relevant QXBMJ1301-2014 "weld repair procedure" is executed. For porosity, slag inclusion, welding tumor, excessive height, the defects are removed by polishing machine. For weld size, local defects, undercut, arc pit, etc. Defects should be welded. When there is a defect, according to the position and depth of the defect, the polishing machine or carbon arc air gouging is used to remove the defect. When the defect is a crack, the start and end points of the crack should be found before carbon arc air gouging. A φ14mm stop crack hole is drilled at the start and end points, and after the crack is completely removed, a groove with a side edge bevel angle greater than 10° is processed. When air gouging, the gouging groove should be opened into a groove shape with a side edge bevel angle greater than 15°, and the surface is repaired, polished and removed. If necessary, use the penetration detection method to determine that the crack has been completely removed. The same position should not be welded more than 2 times.

[0041] Specifically, the preparation method of the tensioning roller support frame of the present application comprises the following steps:

[0042] Step S1: splicing the main vertical plate 1; the following three steps are performed:

[0043] Step S101, the lower end of the first steel plate 11 and the upper end of the second steel plate 12 are combined and spliced to form a first assembly;

[0044] Step S102, the upper end of the third steel plate 13 and the lower end of the fourth steel plate 14 are combined and spliced to form a second assembly;

[0045] Step S103, the right side of the first assembly and the left side of the second assembly are combined and spliced to form the main vertical plate 1;

[0046] The step S101 and the step S102 can be adjusted in sequence. Since the size of the steel plate is limited, the same steel plate cannot cut out the first component or the second component, therefore, the first steel plate and the second steel plate 12 are cut out from the whole steel plate firstly, and then the first component is formed by welding. Similarly, the third steel plate 13 and the fourth steel plate 14 are cut out from the whole steel plate, and then the second component is formed by welding. Then, the first component and the second component are welded into the main vertical plate 1. The steel plate needs to be corrected before cutting to ensure flatness, and the bevel needs to be processed during the cutting process to facilitate subsequent welding. Considering the large size span of the main vertical plate 1, in order to reduce the number of turning over and reduce the difficulty of bevel processing, the first steel plate 11, the second steel plate 12, the third steel plate 13 and the fourth steel plate 14 are welded by V-shaped bevel flat butt welding, and the welding gap is 2-3 mm. Before welding, the arc guide plate and the arc extinguishing plate are arranged on both sides of the welding seam. The sample plate is used to ensure that the gap is 2-3 mm during welding. At the same time, 4 mm thick and 30 mm wide pad iron is also placed under both sides of the welding seam to prevent welding deformation, and also to avoid the workpiece sticking to the workbench due to welding penetration during welding. In order to avoid moving, the workpiece also needs to be fixed on the workbench near the welding seam by using a clamp.

[0047] In a preferred embodiment, a reinforcing plate is also butt welded on both sides of the S-shaped welding seam to increase the strength and prevent deformation during welding and turning over of the workpiece. After the front welding of the first component and the second component, the process channel steel is welded with the two reinforcing plates to increase the strength of the S-shaped welding seam, and the welding seam can be saturated and the main vertical plate 1 can be prevented from deforming when the main vertical plate 1 is turned over. The arc of the turning part of the S-shaped welding seam must be continuously welded without stopping and starting.

[0048] Step S2: welding each component of the outer side of the main vertical plate 1

[0049] The main vertical plate 1 is fixed horizontally on the workbench, and the upper end face and the left end face of the main vertical plate 1 are used as the reference, and then the outer side of the horizontal rib plate 8, the vertical rib plate 9 and the roller support are welded from left to right by skip welding.

[0050] Skip welding is helpful for heat dissipation and quick cooling and setting. After skip welding of the horizontal rib plate 8, the vertical rib plate 9 and the roller support, subsequent turning over still needs to be supplemented and welded, therefore, the total length of skip welding is half of the length of the whole welding seam, and then the other half is welded by supplementing and welding. In a preferred embodiment, the length of the spot welding seam is 20-30 mm.

[0051] Step S3: welding each component of the upper plate 4, the lower plate 5, the left end plate 2, the right end plate 3 and the inner side of the main vertical plate 1 by full welding in the following steps:

[0052] Step S301: turn over the main vertical plate 1 and find the correct position and pad height to place the main vertical plate 1 horizontally.

[0053] The lifting and overturning of the main vertical plate 1 is performed by using multiple cranes. During the operation, the multiple cranes need to operate simultaneously to keep the workpiece in a balanced and stable state, so as to avoid deformation of the workpiece. After the overturning, the up-down position of the main vertical plate 1 remains unchanged, and the left-right position is exchanged.

[0054] In step S302, the main vertical plate 1 is butt-welded with the upper panel 4, and a temporary lifting lug is welded on the upper panel 4.

[0055] The welding of the main vertical plate 1 and the upper panel 4 is performed in a full-welding manner. During the welding, the welding seam close to the inner side is welded first, and the welding seam close to the outer side is welded after the overturning. The temporary lifting lug is used to facilitate the lifting of the support frame. After the completion of the tensioning drum support frame, the temporary lifting lug can be knocked off.

[0056] In step S303, the inner side horizontal rib plate 8 and the vertical rib plate 9 are welded in sequence from left to right with the upper end surface and the left end surface of the main vertical plate 1 as the reference.

[0057] In step S304, the main vertical plate 1 is butt-welded with the lower panel 5, the left end plate 2 and the right end plate 3.

[0058] In step S305, one of the triangular plates 6 is butt-welded with the lower panel 5 and the left end plate 2, and the other triangular plate 6 is butt-welded with the lower panel 5 and the right end plate 3.

[0059] After the above welding is completed, triangular rib plates can be welded at intervals between the upper panel 4 and the main vertical plate 1, between the upper panel 4 and the left end plate 2, and between the upper panel 4 and the right end plate 3 for reinforcement.

[0060] In step S4, the main vertical plate 1 is overturned for the second time, the outer side high vertical rib is assembled and welded, and the remaining welding seams of the outer side horizontal rib plate 8, the vertical rib plate 9 of the main vertical plate 1, the remaining welding seams of the carrier roller support, and the outer side welding seams of the upper panel 4, the lower panel 5, the left end plate 2, the right end plate 3 and the triangular plate 6 are welded.

[0061] The performance tests of the prepared tensioning drum support frame are shown in Table 2 and Table 3. The deformation and flatness of the tensioning drum support frame are effectively controlled, and the welding quality grade of the welding seam reaches the second level, which meets the use requirements of the tensioning drum support frame.

[0062] Table 2: Performance of the tensioning drum support frame

[0063]

[0064]

[0065] At the same time, the welding quality of the tensioning drum support frame is also detected, and the detection results are shown in Table 3.

[0066] Table III: Weld Defects and Weld Quality Grades

[0067] Cracks No Penetration No Fusion No Porosity No Inclusions No Welding protrusion No Excessive reinforcement No Undercut No Incomplete crater No Welding quality grade Grade II

[0068] Thus, two tension roller support frames are made for making the head frame. After the two tension rollers are welded, the total length size is ensured to be consistent with the left end face as the reference. If it is not consistent, then the right end plate 3 is repaired by semi-automatic flame cutting. The total height is also treated in the same way and is not repeated.

[0069] The above only discloses the preferred embodiments of the present application, and of course cannot limit the scope of the rights of the present application. Those skilled in the art can understand that all or part of the processes of the above embodiments are implemented, and equivalent changes made according to the claims of the present application still belong to the scope covered by the present application.

Claims

1. A tensioning roller support frame, characterized by: It includes a main vertical plate, a left end plate, a right end plate, an upper panel, a lower panel, two triangular plates, a cover plate, a transverse rib plate, and a vertical rib plate. The left side of the main vertical plate is welded to the left end plate, the right side of the main vertical plate is welded to the right end plate, the upper end of the main vertical plate is welded to the upper panel, the lower end of the main vertical plate is welded to the lower panel, one right-angled side of the triangular plate is welded to the lower panel, the other right-angled side of the triangular plate is welded to the left end plate or the right end plate, the oblique side of the triangular plate is welded to the cover plate, the transverse rib plate and the vertical rib plate are welded to the main vertical plate. The inner side surface and the outer side surface are welded, and the main vertical plate includes a first steel plate, a second steel plate, a third steel plate, and a fourth steel plate. The lower end of the first steel plate is welded to the upper end of the second steel plate, and the right end of the second steel plate is welded to the left end of the third steel plate. The second steel plate and the third steel plate are provided with mutually engaged bosses, so that the weld between the second steel plate and the third steel plate is S-shaped. The upper end of the third steel plate is welded to the lower end of the fourth steel plate, and the upper end of the third steel plate is provided with a groove, and the lower end of the fourth steel plate is engaged in the groove.

2. A method for preparing a tensioning roller support frame, characterized in that: The following steps are involved: Step S1: Welding the main vertical plate; this is done in three steps: Step S101: The lower end of the first steel plate and the upper end of the second steel plate are welded together to form a first assembly; Step S102: The upper end of the third steel plate and the lower end of the fourth steel plate are welded together to form a second assembly; Step S103: The right side of the first component and the left side of the second component are welded together to form a main vertical panel; Step S2: Welding the components on the outer side of the main vertical plate: Fix the main vertical plate horizontally on the working platform, and weld the horizontal ribs, vertical ribs, and roller supports on the outer side from left to right in sequence, taking the upper end face and left end face of the main vertical plate as the reference. The welding method is jump welding. Step S3: Welding the upper panel, lower panel, left end plate, right end plate, and the components on the inner side of the main vertical plate. The welding method is full welding and is carried out in the following steps: Step S301: Turn over the main vertical plate, align it, and raise it so that it is placed horizontally. Step S302: Weld the main vertical plate to the upper panel, and weld temporary lifting lugs on the upper panel; Step S303: Using the upper end face and the left end face of the main vertical plate as reference, sequentially weld the transverse ribs and the vertical ribs on the inner side from left to right; Step S304, welding the main vertical plate to the lower panel, the left end plate, and the right end plate; Step S305: welding one triangular plate to the lower panel and the left end plate, and welding another triangular plate to the lower panel and the right end plate; Step S4: Flip the main vertical plate for the second time, assemble and weld the high vertical ribs on the outer side, weld the remaining welds of the transverse rib plate, vertical rib plate, and roller support on the outer side of the main vertical plate, and weld the outer welds of the upper panel, lower panel, left end plate, right end plate, and triangle plate.

3. The method for preparing the tensioning roller support frame according to claim 2, characterized in that: In step S1 , the first steel plate, the second steel plate, the third steel plate, and the fourth steel plate are butt-welded using a V-groove, and the weld groove gap is 2 to 3 mm.

4. The method for preparing the tensioning roller support frame according to claim 2, wherein: During the welding process, shims 3 to 5 mm thick and 25 to 35 mm wide are placed under both sides of the weld.

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