Progressive lock seam forming apparatus for roofing panels

Abstract

The embodiment of the present application provides a progressive lock seam forming device for a roof panel, which comprises a machine body and a plurality of forming roller groups. The forming roller groups are arranged in sequence at the bottom end of the machine body in the advancing direction, and are gradually arranged in the manner of approaching the final profile at the profiling angle, so as to progressively press form the lock seam structure. The forming roller group comprises a counter roller and a forming roller matched with each other, and a forming channel is formed between the counter roller and the forming roller for the lock seam structure to pass through and be profiled. The forming channels of the forming roller groups are aligned in the advancing direction, so as to facilitate the smooth passing of the lock seam structure. The forming roller parallel to the roof panel is a horizontal roller, the rotating shaft of which is parallel to the roof panel, and the horizontal roller and the lock seam structure are in rolling and linear contact. Since the linear speed of each point on the horizontal roller is uniform, there is no linear speed difference at the contact position of the horizontal roller and the lock seam structure, so that the surface paint layer of the lock seam structure can be effectively prevented from being scratched, and the corrosion resistance and service life of the lock seam after forming are ensured.

Description

Technical Field

[0001] This invention relates to the field of building panel forming equipment technology, and more particularly to a progressive locking forming device for roof panels. Background Technology

[0002] Metal roofs are constructed by sequentially splicing multiple roof panels. Adjacent roof panels are interlocked at their adjacent edges and then rolled together to form a lock-lock structure (or seam). This not only connects adjacent roof panels but also ensures good connection strength, overall rigidity, and excellent waterproofing. The lock-lock forming process is typically completed using a lock-lock machine, relying on the continuous extrusion and gradual bending of multiple forming rollers on the machine to achieve the desired shape. Currently, the rotation axis of the forming rollers on lock-lock machines is usually perpendicular to the roof panel. During the rotation of the forming rollers, because the relative positions of all points on the same diameter of the forming roller remain consistent, the linear velocity of points closer to the axis of rotation is lower than that of points farther from the axis, resulting in a velocity difference between points on the same radius of the forming roller. Furthermore, in the progressive bending process, the forming force of the final bending process is usually greater than that of the preceding bending processes. This can lead to paint scratches on the seams during the final flattening process due to the large forming force and speed difference, thus reducing the corrosion resistance of the seams and making the seams more susceptible to corrosion. Summary of the Invention

[0003] In view of the above problems, embodiments of the present invention are proposed. The purpose of the embodiments of the present invention is to provide a progressive seam forming device for roof panels that does not produce paint scratches when the adjacent edges of two adjacent roof panels are interlocked and formed.

[0004] To achieve this objective, the embodiments of the present invention adopt the following technical solutions: A progressive seam forming device for roof panels, comprising: Body; and The forming roller assembly includes a mating roller and a forming roller that cooperate with each other. The mating roller and the forming roller have a forming channel that allows the locking edge engagement structure to pass through and presses the locking edge engagement structure. Multiple forming roller assemblies with different pressing angles are arranged sequentially at the bottom of the machine body along the travel direction according to the trend of the pressing angle gradually approaching the final shape. The forming channels of the different forming roller assemblies are aligned along the travel direction. The forming roller, which is parallel to the roof panel, is used to press the locking and interlocking structure into a horizontal roller with its rotation axis parallel to the roof panel.

[0005] Optionally, a forming roller is located upstream of the horizontal roller, and the forming angle of the forming roller is between the initial angle of the locking structure and its parallelism with the roof panel; or The horizontal roller has multiple forming rollers upstream, and the forming angles of the multiple forming rollers transition sequentially along the travel direction from the initial angle of the locking interlocking structure to parallel to the roof panel.

[0006] Optionally, the horizontal roller has a limiting structure, and the locking edge engagement structure abuts against the limiting structure at its free end, which is bent parallel to the direction of the roof panel.

[0007] Alternatively, the horizontal roller is a cylindrical roller, and the limiting structure is a shoulder of the cylindrical roller on the side opposite to the abutting roller.

[0008] Optionally, it also includes: The guide roller is located upstream of the forming roller group, and when the locking edge engagement structure abuts against the guide roller, it is aligned with the forming channel.

[0009] Optionally, the angle between the contact surface of the guide roller that abuts against the locking edge engagement structure and the roof panel is the initial angle of the locking edge engagement structure.

[0010] Optionally, the forming roller group consists of four rollers. Along the travel direction, the horizontal roller is located in the third forming roller group, and the contact surface of the forming roller of the fourth forming roller group that abuts against the locking edge interlocking structure is parallel to the roof panel.

[0011] Optionally, the locking structure includes a vertical portion perpendicular to the roof panel and a horizontal portion parallel to the roof panel; When the forming roller group presses the horizontal part, the abutment roller and the forming roller are located on both sides of the vertical part and both abut against the vertical part.

[0012] Optionally, the axes of the forming rollers upstream and downstream of the horizontal roller are both perpendicular to the roof panel; The abutting rollers of the forming roller group upstream and downstream of the horizontal roller rotate in the opposite direction to the forming roller; The abutting roller is a passive roller; or A first gear is fitted on the rotating shaft of the forming roller, and a second gear is fitted on the rotating shaft of the abutting roller, with the first gear engaging with the second gear.

[0013] Optionally, the angle between the axis of the forming roller upstream of the horizontal roller and the roof panel is the same as the pre-forming angle.

[0014] The technical solution provided by this invention defines a horizontal roller as a forming roller that is parallel to the roof panel and presses the seam interlocking structure. The rotation axis of the horizontal roller is parallel to the roof panel, so that the horizontal roller and the seam interlocking structure are rolled and in line contact. Since the linear velocity of each point on the outer surface of the horizontal roller is the same, the linear velocity of each point on the contact line between the horizontal roller and the seam interlocking structure is also the same. This ensures that there is no difference in linear velocity between the parts of the horizontal roller and the seam interlocking structure that are in contact, which can avoid scratches on the paint layer of the seam interlocking structure and ensure the corrosion resistance and service life of the formed seam. Attached Figure Description

[0015] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0016] Figure 1 A schematic diagram of a vertical locking interlocking structure; Figure 2 A schematic diagram of a 90° bent-edge interlocking structure; Figure 3 This is a schematic diagram of the structure of a progressive seam forming device for roof panels according to an embodiment of the present invention; Figure 4 This is a bottom view of a progressive seam forming device for roof panels provided in an embodiment of the present invention; Figure 5 A cross-sectional view of a 90° bent seam interlocking structure provided in an embodiment of the present invention without being pressed by a progressive seam forming device for roof panels; Figure 6 This is a cross-sectional view of a 90° bent interlocking structure provided in an embodiment of the present invention during the pressing process by a guide roller; Figure 7 This is a cross-sectional view of a 90° bent edge interlocking structure provided in an embodiment of the present invention as it is pressed by the first forming roller group; Figure 8 This is a cross-sectional view of a 90° bent edge interlocking structure provided in an embodiment of the present invention during the pressing process by the second forming roller group; Figure 9 This is a cross-sectional view of a 90° bent interlocking structure provided in an embodiment of the present invention during horizontal roll forming; Figure 10 This is a cross-sectional view of the 90° bent edge interlocking structure provided in an embodiment of the present invention during the pressing process by the fourth forming roller group.

[0017] In the picture: 1. Forming roller assembly; 2. Machine body; 3. Guide rollers; 4. Locking edge structure; 11. Abutting roller; 12. Forming roller; 13. Horizontal roller; 131. Limiting structure; 14. Forming channel; 41. The bent part; 42. The unchanging part. Detailed Implementation

[0018] The present invention will now be described in further detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and not intended to limit it. Furthermore, it should be noted that, for ease of description, the accompanying drawings show only the parts relevant to the present invention, and not all of the structures.

[0019] In the description of this invention, unless otherwise explicitly specified and limited, the terms "connected," "linked," and "fixed" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0020] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0021] In the description of this embodiment, the terms "upper," "lower," "right," etc., refer to the orientation or positional relationship shown in the accompanying drawings. They are used only for ease of description and simplification of operation, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the present invention. In addition, the terms "first" and "second" are used only for distinction in description and have no special meaning.

[0022] Metal roofs on metal buildings are typically constructed by sequentially joining multiple metal roof panels. To ensure the strength, rigidity, and waterproofing of the joints, please refer to [the relevant documentation / reference needed]. Figures 1-2As shown, typically, the adjacent edges of two adjacent roof panels are overlapped together, with the outer edge being longer than the inner edge, thus covering the inner edge. Then, the two are bent together at a certain angle, such as 90 degrees, 270 degrees, 360 degrees, or 450 degrees, to form a locking interlocking structure 4.

[0023] If the locking edge interlocking structure 4 is formed by manual bending, it is not only inefficient and consumes a lot of manpower, but also prone to defects such as insufficient interlocking depth, incomplete fastening, loose locking edge, and inconsistent gap size due to uneven forming force applied manually and inconsistent techniques of different operators. It is difficult to guarantee the stability, durability, and waterproof performance of long-term use. In addition, there will be rework work caused by manual operation errors later.

[0024] Based on this, please refer to Figures 3-4 As shown, this application embodiment provides a progressive lock seam forming device for roof panels. The progressive lock seam forming device for roof panels includes a machine body 2 and a forming roller group 1 located below the machine body 2. The forming roller group 1 has a forming channel 14 in the middle that allows the locking edge interlocking structure 4 to pass through. After the adjacent edges of two adjacent roof panels are interlocked with each other, they pass through the forming channel 14 to form the locking edge interlocking structure 4.

[0025] Compared to manual bending, using a progressive seam forming device for roof panels to form the overlapping edges of adjacent roof panels into a seam interlocking structure 4 is not only more efficient, but also allows for uniform and stable forming force applied to the overlapping edges through mechanical rolling, ensuring the density and consistency of the seam interlocking structure 4. This improves the overall integrity and sealing performance of the seam interlocking structure 4, reducing the risk of roof leaks and seepage. Furthermore, the seam interlocking structure 4 formed by the progressive seam forming device for roof panels has precise dimensions and a regular shape, better matching the design stress and wind uplift resistance requirements of metal roofs, enhancing the overall wind and deformation resistance of the roof, and improving the overall construction quality and service life of the roof.

[0026] Since metal roof panels are mostly thin sheet materials with limited plasticity, such as color steel and aluminum-magnesium-manganese alloys, if a single set of rollers is used to bend the panels to the final locking angle in one go, excessive deformation and stress concentration can lead to problems such as cracking, springback, twisting, or damage to the surface coating at the edges, severely affecting the locking quality and roof waterproofing performance. Furthermore, locking structures are often multi-layered, and a single strong press makes it difficult to accurately control the forming dimensions and fit, easily resulting in incomplete locking and uneven gaps.

[0027] Therefore, please refer to Figures 3-4As shown in some embodiments of this application, the progressive seam forming device for roof panels includes multiple forming roller groups 1. As the progressive seam forming device for roof panels moves, the seam interlocking structure 4 at the same position passes through the multiple forming roller groups 1 sequentially, gradually forming the final seam interlocking structure 4. By progressively rolling the multiple forming roller groups 1 with increasing angles, the total deformation can be distributed into multiple small-amplitude deformations, effectively releasing internal stress, avoiding material damage, and ensuring smooth and undeformed edges of the panels. In addition, progressive forming allows the panels to be gradually positioned and corrected during the rolling process, making the seam contour more regular and the interlocking tighter. This improves forming accuracy and structural density, reduces the instantaneous load on the equipment, ensures stable operation of the progressive seam forming device for roof panels, extends the service life of the rollers and the entire machine, and ensures that the seam quality remains uniform during continuous construction.

[0028] The machine body 2 is equipped with a power unit to provide rotational power to multiple forming roller groups 1. The power unit can be a structure of a rotary motor and a reducer. The rotational power of the rotary motor is transmitted to the forming roller groups 1 after being reduced in speed by the reducer. Since all forming roller groups 1 work simultaneously, they can share a single power unit, and the rotation of all forming roller groups 1 can be achieved through a transmission component. The transmission component can be a combination of belts and pulleys, a meshing structure of multiple gears, or other structures capable of power transmission. The specific structure of the transmission component can be configured according to the actual situation, and this application does not impose specific limitations on it. Alternatively, each forming roller group 1 can be equipped with its own power unit.

[0029] In some embodiments of this application, please refer to Figures 3-4 , Figures 7-10 As shown, one possible structure of the forming roller group 1 includes abutment roller 11 and forming roller 12 that cooperate with each other. A forming channel 14 is provided between the abutment roller 11 and the forming roller 12, allowing the locking edge engagement structure 4 to pass through and pressing the locking edge engagement structure 4. The abutment roller 11 provides radial support and positioning for the upright edges or overlapping parts of the roof panel, preventing lateral displacement, swaying, or excessive deformation of the panel during the rolling process, ensuring that the locking edge remains in a stable forming position. The forming roller 12 has a corresponding forming surface set according to a preset engagement angle and contour. During the movement of the progressive locking seam forming device for the roof panel, it works in conjunction with the abutment roller 11 to apply roller pressure to the locking edge passing through the forming channel 14, causing the panel to undergo plastic deformation according to the design shape.

[0030] Understandably, different metal buildings have different usage scenarios, waterproofing levels, wind resistance requirements, roof slopes, and roof panel materials and thicknesses. These different factors result in different interlocking structures between adjacent roof panels on different metal roofs. For example... Figure 1 The upright locking edge interlocking structure shown Figure 2 The 90° bent locking structure is shown. The biggest difference between the different locking structures 4 lies in the bending angle. A larger bending angle results in greater rigidity, strength, and locking depth, providing stronger wind resistance and higher waterproof reliability. Therefore, the number of forming roller sets 1 required for different locking structures 4 varies. Locking structures 4 with smaller bending angles require fewer forming roller sets 1, while those with larger bending angles require more. Regardless of the number of forming roller sets 1, please refer to... Figures 6-10 As shown in some embodiments of this application, multiple forming roller groups 1 are arranged sequentially along the traveling direction of the progressive seam forming device for roof panels, with the pressing angle gradually approaching the final shape, so that the seam edge of the roof panel can be gradually and uniformly rolled and formed as it passes through each of the forming roller groups 1 in sequence. By replacing a single large-angle bend with multiple small-amplitude progressive bending, problems such as stress concentration, surface coating damage, edge warping, and even cracking caused by excessive instantaneous deformation are effectively avoided. At the same time, the progressively increasing pressing angle allows the locking edge interlocking structure 4 to continuously correct its position and posture during the forming process, ensuring a regular interlocking contour and uniform interlocking gap. This not only improves the density and integrity of the locking edge interlocking structure 4, but also ensures that the final upright or large-angle bent locking edge has sufficient structural rigidity and deformation resistance, meeting the waterproof sealing and wind uplift resistance requirements of different application scenarios. In addition, this sequential arrangement allows each forming roller group 1 to share the forming load, reducing the stress intensity of a single roller group and ensuring continuous and stable operation of the progressive locking edge forming device for roof panels. It also adapts to the locking edge forming requirements of different bending angles and different board characteristics, enhancing the versatility and construction adaptability of the equipment.

[0031] It is understandable that, regardless of the type of interlocking structure 4, where the edge of one roof panel wraps around the edge of another roof panel, when the bend exceeds 180°, the bent portion 41 will fit snugly against the unchanging portion 42 (e.g., Figures 1-2(As shown). Normally, the rotation axis of the forming roller group 1 is perpendicular to the roof panel. For the upright locking structure 4, in the final process of pressing the bent portion perpendicular to the roof panel, since the forming roller 12 and the locking structure 4 are rolled during the pressing process, the outer surface of the forming roller 12 is linearly in contact with the locking structure 4, and the linear velocity at each point on the contact line is consistent. This ensures that the sheet material is not damaged during the pressing process, guaranteeing good locking quality. However, for the 90° bent locking structure 4, since the bent portion 41 is parallel to the roof panel, in the final pressing process, although the forming roller 12 rotating along the rotation axis perpendicular to the roof panel can achieve the pressing requirement, the contact force applied to the sheet material during the forming process is applied to the radial surface of the forming roller 12 rather than the circumferential surface. Therefore, when the forming roller 12 contacts the sheet material, it is a surface contact, resulting in greater friction. Furthermore, while the relative position of each point along the radial direction remains consistent during the rotation of the forming roller 12, the distance between each point and the axis of rotation is different, resulting in inconsistent circumferences. For example, points closer to the axis in the radial direction travel a smaller circumference, while points farther from the axis travel a longer circumference. This leads to different linear velocities at each point in the radial direction during the rotation of the forming roller 12. Consequently, when the forming roller 12 contacts the sheet and applies forming pressure, a speed difference is formed at different positions along the radial direction on the contact surface between the forming roller 12 and the sheet. Under the action of speed difference and high friction, the formed locking edge interlocking structure 4 will experience paint scratches, affecting not only its appearance but also its corrosion resistance.

[0032] To resolve this issue, please refer to [link / reference]. Figure 9 As shown, in some embodiments of this application, the forming roller 12 parallel to the roof panel is configured as a horizontal roller 13, with the rotation axis of the horizontal roller 13 parallel to the roof panel. This allows the horizontal roller 13 to form a linear rolling contact with the locking edge structure 4 on its circumferential surface during the rolling operation, replacing the radial surface contact of the original vertical axis forming roller 12. This not only reduces friction in the contact area but also ensures that the distance between each point on the outer periphery of the horizontal roller 13 and the rotation axis remains uniform during rotation. This effectively eliminates speed differences between different radial positions, preventing scratches on the locking edge due to the combined effect of speed differences and large friction. This ensures the integrity of the metal roof panel's appearance and protects the anti-corrosion coating on the panel surface from damage, guaranteeing the good anti-corrosion performance and structural durability of the locking edge structure 4. Furthermore, the horizontal roller 13 applies more uniform pressure to the panel during the rolling forming process, resulting in a smoother and more stable forming process. This allows for precise forming of 90° bend locking edges while further improving overall construction quality and finished product qualification rate.

[0033] In some practical situations, when pressing the locking seam structure 4, the angle difference between the initial angle α between the bent portion 41 of the locking seam structure 4 and the roof panel and the angle at which the bent portion 41 is parallel to the roof panel is relatively small. Therefore, in some embodiments of this application, the progressive locking seam forming device for the roof panel may have only one forming roller 12 upstream of the horizontal roller 13, and the forming angle of the forming roller 12 is between the initial angle α of the locking seam structure 4 and the angle at which it is parallel to the roof panel. The forming roller 12 performs a small-amplitude progressive pressing on the bent portion 41 in advance, so that it first reaches the transition angle, and then the downstream horizontal roller 13 completes the final 90° bend and the forming process that keeps it parallel to the roof panel. The final forming of the locking seam structure 4 can be completed through two-stage step forming.

[0034] In other cases, such as Figure 6 As shown, during the pressing of the interlocking structure 4, the angle difference between the initial angle α between the bent portion 41 of the interlocking structure 4 and the roof panel and the angle at which the bent portion 41 is parallel to the roof panel is relatively large. Please refer to... Figures 3-4 , Figures 7-10 As shown in some embodiments of this application, in the progressive seam forming device for roof panels, there are multiple forming rollers 12 upstream of the horizontal roller 13. The forming angles of the multiple forming rollers 12 transition sequentially along the travel direction from the initial angle α of the seam interlocking structure 4 to parallel to the roof panel. Through the step-by-step transition forming by multiple forming rollers 12, the large total angle difference is decomposed into multiple small angle increments, so that the seam-bent part 41 only undergoes small plastic deformation in each rolling process, effectively releasing the internal stress generated in the board during the forming process, and avoiding problems such as edge cracking, coating damage, or springback deformation caused by excessive single angle deformation. Each forming roller 12 undertakes part of the angle bending task, which can not only gradually correct the posture of the bent part 41 to ensure that the angle after each forming step is accurate and controllable, but also make the forming process of the bent part 41 more stable and smooth, laying a good foundation for the final forming of the downstream horizontal roller 13.

[0035] The number of forming rollers upstream of the horizontal roller 13 can be determined according to the actual situation, and this application does not make specific limitations on this.

[0036] In the initial stage of pressing the locking edge interlocking structure 4 using the progressive locking seam forming device for roof panels, the width of the forming channel 14 is usually larger than the width of the locking edge interlocking structure 4 to facilitate its entry into the forming channel 14. This allows the locking edge interlocking structure 4 to smoothly embed into the forming space between the abutment roller 11 and the forming roller 12, avoiding hard collisions, jamming, or scratches between the locking edge and the rollers due to an excessively narrow channel. This ensures that the progressive locking seam forming device for roof panels can start smoothly and move normally. However, this also results in the locking edge interlocking structure 4 not being able to fully contact the forming rollers 12 and the abutment roller 11 on both sides during pressing in the forming channel 14, leading to poor locking effect and incomplete locking after forming.

[0037] To solve the above problems, please refer to Figures 3-4 as well as Figure 6 As shown, in some embodiments of this application, the progressive seam forming device for roof panels further includes a guide roller 3. Along the direction of travel of the progressive seam forming device for roof panels, the guide roller 3 is located upstream of the forming roller group 1. When the seam locking structure 4 abuts against the guide roller 3, the seam locking structure 4 is aligned with the forming channel 14. The guide roller 3 can pre-guide and position-correct the seam locking structure 4 before it enters the forming channel 14. Relying on the abutment and limiting effect with the seam locking structure 4, the guide roller 3 forces the seam locking structure 4 to maintain a centered and upright feeding posture, ensuring it is precisely aligned with the center position of the subsequent forming channel 14, allowing the seam locking structure 4 to smoothly enter the forming channel 14. Based on this, in embodiments of this application, the seam locking structure 4 includes a vertical portion perpendicular to the roof panel (i.e., the unchanging portion 42 mentioned above) and a horizontal portion parallel to the roof panel (i.e., the bent portion 41 mentioned above). When the forming roller group 1 presses the horizontal part, the abutment roller 11 and the forming roller 12 are located on both sides of the vertical part and are in contact with the vertical part. Through the bidirectional contact and limiting between the rollers on both sides and the vertical part, a stable lateral constraint can be formed on the locking edge interlocking structure 4 during the pressing process, preventing the locking edge interlocking structure 4 from moving left and right, tilting or twisting under the pressing force, and ensuring that the vertical part always maintains a regular shape perpendicular to the roof panel. At the same time, it provides a reliable positioning reference for the bending pressing of the bent part 41, so that the bent part is subjected to uniform force and consistent deformation during the process of being pressed parallel to the roof panel, preventing problems such as poor locking effect and incomplete interlocking caused by positional deviation. In addition, it further ensures the overall forming accuracy of the locking edge interlocking structure 4.

[0038] In some embodiments of this application, please refer to Figure 6As shown, the angle between the contact surface of the guide roller 3 that abuts against the locking structure and the roof panel is the initial angle α of the locking structure. This allows the guide roller 3 to achieve a close-fitting guide match with the locking structure during the feeding stage, avoiding localized pressure, deformation, warping, or coating scratches on the locking edge caused by angle mismatch. Furthermore, it allows the locking structure to smoothly enter the subsequent forming channel 14 with a uniform initial posture, ensuring consistency after forming.

[0039] It should be noted that the guiding function of the guide roller 3 is also a primary pressing process. The angle between adjacent edges of adjacent roof panels before entering the guide roller 3 after they interlock does not have to be the initial angle α. The initial angle α is the angle after pressing by the guide roller 3. This ensures that the forming angle of the locking edge interlocking structure 4 after being pressed by the forming roller group 1 is accurate and uniform, and the posture is regular and symmetrical. This effectively eliminates the angle deviation, slight warping or positional shift of the roof panel edges during interlocking, handling and initial placement. It also avoids the cumulative error caused by the disordered initial posture in subsequent multi-stage rolling. At the same time, it ensures that the locking edge structure can be subjected to force in a consistent posture when entering each forming roller 12, preventing problems such as local stress concentration, paint scratches and damage, and insufficient interlocking density caused by angle disorder. This ensures that the final formed locking edge structure is dimensionally stable and tightly fitted, meeting the overall requirements of roof waterproofing, wind uplift resistance and smooth appearance.

[0040] Please refer to some embodiments of this application. Figure 9 As shown, the horizontal roller 13 has a limiting structure 131, and the free end of the locking edge structure bent parallel to the roof panel abuts against the limiting structure 131. The limiting structure 131 effectively constrains and positions the free end during the roll forming process of the locking edge structure by the horizontal roller 13, preventing lateral slippage, excessive extension, or warping deformation of the free end under the pressure force, ensuring that the bending position, extension length, and final forming shape of the locking edge structure meet the design requirements. Simultaneously, by limiting the displacement of the free end, the entire locking edge structure can be subjected to more balanced force during the forming process, avoiding problems such as asymmetry in forming and dimensional deviations caused by uneven local force, improving the forming regularity and consistency of the locking edge interlocking structure 4, and ensuring a tight and reliable interlock between adjacent roof panels.

[0041] Specifically, please refer to Figure 9As shown in some embodiments of this application, one possible structure for the horizontal roller 13 is that the horizontal roller 13 is a cylindrical roller, and the limiting structure 131 is a shoulder on the side of the cylindrical roller away from the abutting roller 11. This shoulder protrudes outward along the radial direction of the horizontal roller 13, which can reliably limit the free end of the locking structure during the rolling process, preventing the free end from moving outward or shifting during rolling forming. In addition, this integrated shoulder structure is simple and reliable, requiring no additional accessories. It is convenient for processing and assembly, and can maintain a stable limiting effect during continuous construction, ensuring that the forming size of the locking interlocking structure 4 is uniform and the edges are neat, further improving the construction stability and finished product quality of the progressive locking seam forming device used for roof panels.

[0042] It needs to be emphasized again that, since the locking structure 4 between two adjacent roof panels of different types is different, the number of forming roller groups 1 on the progressive locking forming device for roof panels and the forming angle of different forming roller groups 1 need to be determined according to the locking structure required by the actual roof panel model. Of course, the number of forming roller groups 1, including the horizontal roller 13, can be one, two, or more, as long as one of the forming roller groups on the progressive locking forming device for roof panels includes the horizontal roller 13, it falls within the protection scope of this application. Below, for DR600 metal roof panels, the locking structure 4 is... Figure 2 The 90° bend-locking interlocking structure 4 shown is described in detail with a progressive lock-lock forming device specifically for roof panels.

[0043] Please refer to some embodiments of this application. Figures 3-4 , Figures 7-10 As shown, the progressive seam forming device for DR600 roof panels has four forming roller groups 1. Along the travel direction, a horizontal roller 13 is located within the third forming roller group 1, and the forming roller 12 of the fourth forming roller group 1 has an abutment surface parallel to the roof panel where it abuts against the seam locking structure 4. This progressive seam forming device for roof panels is designed for... Figure 2 For the forming of the 90° bend locking interlocking structure 4 shown, please refer to... Figure 7 and Figure 8 As shown, the first two forming roller groups 1 progressively adjust the angle and initially press the locking edge structure 4, gradually transitioning it towards a direction parallel to the roof panel. The third forming roller group 1 completes the main bending and forming operation via the horizontal roller 13, pressing the locking edge structure 4 to a near-horizontal state. Simultaneously, the rolling contact characteristics of the horizontal roller 13 reduce friction and speed differences, preventing paint scratches and coating damage. Please refer to... Figure 10As shown, the fourth forming roller group 1 uses the contact surface parallel to the roof panel to perform the final leveling, shaping and compaction of the locking edge interlocking structure 4, eliminating the slight warping, springback or loose fit that may exist in the previous forming process, so that the locking edge structure finally maintains a flat, uniform and fully fitted shape, further improving the density, regularity and overall stability of the locking edge interlocking structure 4, and ensuring that the forming quality meets the requirements of roof waterproofing and structural stress.

[0044] Further, please refer to Figures 3-4 , Figures 7-10 As shown, in some embodiments of this application, the axes of the forming rollers 12 upstream and downstream of the horizontal roller 13 are perpendicular to the roof panel to adapt to the traditional progressive seam forming device for roof panels. Based on the traditional progressive seam forming device for roof panels, only the forming roller 12, which rotates parallel to the roof panel and perpendicular to the roof panel axis, needs to be replaced with the horizontal roller 13. The structural modification is small and easy to implement. Therefore, in some embodiments of this application, the abutting roller 11 of the forming roller group 1 upstream and downstream of the horizontal roller 13 rotates in the opposite direction to the forming roller 12. The abutting roller 11 is a passive roller, driven by the edge-locking structure 4 during the progressive seam forming device for roof panels, and rotates accordingly. No additional drive mechanism is required, simplifying the overall transmission structure and reducing equipment manufacturing costs and assembly difficulty. Furthermore, the passively rotating abutting roller 11 can flexibly adapt to the traveling speed of the edge-locking structure, ensuring a smooth and stable rolling process.

[0045] In some other embodiments of this application, a first gear is fitted onto the rotating shaft of the forming roller 12, and a second gear is fitted onto the rotating shaft of the abutment roller 11, with the first gear engaging with the second gear. Through the meshing transmission of the two sets of gears, the forming roller 12 and the abutment roller 11 can maintain synchronous, opposite, and uniform linear velocity rotation, ensuring that the locking edge engagement structure 4 experiences uniform force and stable movement during the rolling process. Simultaneously, the gear transmission method can precisely control the rotation phase and clearance of the rollers, preventing relative slippage, reducing the probability of paint scratches and coating damage on the sheet surface, and improving forming accuracy and structural consistency.

[0046] Of course, in some other embodiments of this application, the angle between the axis of the forming roller 12 upstream of the horizontal roller 13 and the roof panel is the same as the pre-forming angle. This ensures that the locking edge interlocking structure 4 is in a rolling pressing process with different forming rollers 12 throughout the pressing process, with linear contact and no speed difference, thus ensuring a good forming process and avoiding pressing defects.

[0047] Along the direction of travel of the progressive seam forming device for roof panels, the angle between the axes of the upstream and downstream forming rollers 12 of the horizontal roller 13 can be determined by the actual situation, as long as the seam interlocking structure 4 can be progressively pressed. This application does not impose any specific limitations.

[0048] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A progressive lock-joint forming device for roof panels, characterized in that, include: Organism; as well as The forming roller assembly includes a mating roller and a forming roller that cooperate with each other. The mating roller and the forming roller have a forming channel that allows the locking edge engagement structure to pass through and presses the locking edge engagement structure. Multiple forming roller assemblies with different pressing angles are arranged sequentially at the bottom of the machine body along the travel direction according to the trend of the pressing angle gradually approaching the final shape. The forming channels of the different forming roller assemblies are aligned along the travel direction. The forming roller, which is parallel to the roof panel, is used to press the locking and interlocking structure into a horizontal roller with its rotation axis parallel to the roof panel.

2. The progressive seam forming device for roof panels according to claim 1, characterized in that, The horizontal roller has a forming roller upstream of it, and the forming angle of the forming roller is between the initial angle of the locking structure and the angle parallel to the roof panel; or The horizontal roller has multiple forming rollers upstream, and the forming angles of the multiple forming rollers transition sequentially along the travel direction from the initial angle of the locking interlocking structure to parallel to the roof panel.

3. The progressive seam forming device for roof panels according to claim 1, characterized in that, The horizontal roller has a limiting structure, and the free end of the locking edge interlocking structure, which is bent towards the direction parallel to the roof panel, abuts against the limiting structure.

4. The progressive seam forming device for roof panels according to claim 3, characterized in that, The horizontal roller is a cylindrical roller, and the limiting structure is a shoulder of the cylindrical roller on the side away from the abutting roller.

5. The progressive seam forming device for roof panels according to any one of claims 1 to 4, characterized in that, Also includes: The guide roller is located upstream of the forming roller group, and when the locking edge engagement structure abuts against the guide roller, it is aligned with the forming channel.

6. The progressive seam forming device for roof panels according to claim 5, characterized in that, The angle between the contact surface of the guide roller that abuts against the locking edge interlocking structure and the roof panel is the initial angle of the locking edge interlocking structure.

7. The progressive seam forming device for roof panels according to claim 5, characterized in that, The forming roller group consists of four rollers. Along the travel direction, the horizontal roller is located in the third forming roller group, and the contact surface of the forming roller of the fourth forming roller group that abuts against the locking edge interlocking structure is parallel to the roof panel.

8. The progressive seam forming device for roof panels according to any one of claims 1 to 4, characterized in that, The locking structure includes a vertical portion perpendicular to the roof panel and a horizontal portion parallel to the roof panel; When the forming roller group presses the horizontal part, the abutment roller and the forming roller are located on both sides of the vertical part and both abut against the vertical part.

9. The progressive seam forming device for roof panels according to any one of claims 1 to 4, characterized in that, The axes of the forming rollers upstream and downstream of the horizontal roller are both perpendicular to the roof panel. The abutting rollers of the forming roller group upstream and downstream of the horizontal roller rotate in the opposite direction to the forming roller; The abutting roller is a passive roller; or A first gear is fitted on the rotating shaft of the forming roller, and a second gear is fitted on the rotating shaft of the abutting roller, with the first gear engaging with the second gear.

10. The progressive seam forming device for roof panels according to any one of claims 1 to 4, characterized in that, The angle between the axis of the forming roller upstream of the horizontal roller and the roof panel is the same as the pre-forming angle.

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