A roll straightening device for aluminum alloy sheet

Abstract

This invention discloses a roller straightening device for aluminum alloy sheets, relating to the field of metal sheet processing technology. It aims to solve the technical problem of the difficulty in straightening sheets with dead fold defects using traditional roller straightening machines. The device includes a roller straightening frame, a conveyor roller frame, an air supply system, and a straightening mechanism. By sequentially configuring the straightening mechanism as a straightening component, a flattening component, and a straightening component, and utilizing an externally convex roller module and an internally concave roller module to form a conical guide path, a pair of opposite-direction force couples can effectively pry open and lift "dead fold" defects in aluminum alloy sheets that cannot be handled by traditional roller straightening processes. The flattening component then flattens the lifted area, and finally, the straightening component completes the precision straightening. This achieves online and automated repair of plastic damage such as "dead folds," breaking the industry dilemma of "dead folds equal scrap," and significantly improving sheet yield, production efficiency, and the consistency of straightening quality.

Description

Technical Field

[0001] This invention relates to the field of metal sheet processing technology, and more specifically, to a roller straightening device for aluminum alloy sheets. Background Technology

[0002] Dead fold defects most commonly occur at the edges and corners of aluminum alloy sheets, especially the long edges, ends (sheet head / tail), and four corners. These areas are most susceptible to collisions, compression, or shear stress during rolling, straightening, transportation, and hoisting. For example, stacking during mill entry, edge chipping due to poor straightening machine guidance, or bumps during transport can easily lead to irreversible plastic folds at these geometric abrupt changes. Furthermore, deep scratches or foreign object indentations on the sheet surface can also become stress concentration points, inducing localized dead folds.

[0003] The design principle and core function of existing roller straightening devices are all aimed at the elastic deformation or recoverable plastic bending (such as waviness, flaring) of the board. They release the residual stress inside the board through repeated bending of the roller system to achieve the purpose of straightening. However, for irreversible plastic folds such as "dead folds" caused by severe compression, the metal fibers have broken and work hardened. The uniform bending stress generated by conventional straightening rollers cannot be effectively applied to the root of the fold, nor can they provide the concentrated moment with precise and controllable direction required to pry it open. Therefore, when existing straightening machines encounter "dead folds" defects, they are either completely unable to handle them, or forcibly passing through may cause the board to tear. There is a fundamental lack of functionality, which is the direct technical reason for the industry practice of "dead folds are scrapped".

[0004] Current production lines lack effective online processing methods for "dead bend" defects. Once such defects are detected, the standard procedure is to mark them as scrap and remove them from the line, or move them to the side of the production line and rely on workers to attempt repairs using experienced methods such as hammering and manual bending. This approach has several drawbacks: first, it is extremely inefficient, with offline repairs severely disrupting continuous production processes; second, quality is uncontrollable, with the repair effect entirely dependent on worker skill, easily causing secondary damage or incomplete repairs; and third, it cannot be integrated, failing to form an automated closed loop of "detection-processing-straightening." Therefore, we propose a roller straightening device for aluminum alloy sheets. Summary of the Invention

[0005] The purpose of this invention is to provide a roller straightening device for aluminum alloy sheets, so as to solve the technical problem that traditional roller straightening machines are difficult to straighten sheets with dead bend defects.

[0006] To solve the above-mentioned technical problems, the present invention provides the following technical solution: a roller straightening device for aluminum alloy plates, comprising a roller straightening frame, a conveying roller frame arranged at the input end of the roller straightening frame, an air supply system arranged on one side of the roller straightening frame, and a straightening mechanism arranged inside the roller straightening frame, wherein the straightening mechanism includes a straightening component, a flattening component, and a straightening component; The correction component, leveling component, and straightening component are arranged sequentially along the direction of the sheet material's travel, together forming a continuous straightening path; The straightening path consists of two interconnected sections: the front section is a tapered guide path, and the rear section is a straight path. The tapered guide path is composed of a straightening component and a flattening component, and its width gradually converges along the direction of the sheet material's travel. The straight path is composed of a straightening component and is used to straighten the sheet material that has been pre-treated by the tapered guide path. The correction assembly includes an externally convex roller shaft module and an internally concave roller shaft module, which are symmetrically arranged along the direction of the sheet material. The convex roller module applies force to the dead fold position of the sheet metal, while the concave roller module applies constraint force to the dead fold position, forming a pair of opposite force couples. This can pry open the opening at the dead fold, and then the flattening component flattens the opening at the dead fold position to both sides of the sheet metal. By setting the straightening mechanism sequentially as a straightening component, a flattening component, and a straightening component, and by utilizing the convex roller module and the concave roller module to form a conical guide path, forming a pair of opposite force couples, this invention can effectively pry open and lift the "dead fold" defect of aluminum alloy sheet metal that cannot be handled by traditional roller straightening processes. The flattening component then flattens the raised area, and finally the straightening component completes the precision straightening. This achieves online and automated repair of plastic damage such as "dead folds," breaking the industry dilemma of "dead folds equal scrap," and significantly improving the sheet metal yield, production efficiency, and consistency of straightening quality.

[0007] Preferably, the externally convex roller module includes a first roller with a cavity, the first roller is rotatably connected between roller straightening machine frames, and the end of the first roller is connected to the output bearing of the air supply system. A first main roller sleeve is sleeved on the surface of the first roller, and a first auxiliary roller sleeve is slidably sleeved on the surface of the first roller at both ends of the first main roller sleeve. The first main roller sleeve is divided into two driving cavities by a partition. A T-shaped passage is arranged on the partition, and a T-shaped three-way ball valve is arranged in the T-shaped passage. Several of the aforementioned T-shaped passageways can be independently connected to one or two drive cavities via T-shaped three-way ball valves, or neither drive cavity can be connected.

[0008] Preferably, each of the driving cavities is slidably fitted with a movable cylinder inside, and each of the movable cylinders is slidably fitted with two push plates, and a pressure chamber is formed between the two push plates. One of the push plates forming the pressure chamber has a plurality of first pipes fixedly connected to it in a ring array on one side, and a slot is opened on the side surface of each first pipe. The other push plate has a plug cylinder fixedly connected to it in a ring array on one side.

[0009] Preferably, each of the inserts has a plug plate fixedly connected to its inner wall, and the plug plate is slidably adapted to the inside of the first pipe. One of the push plates is fitted with an inner ring with a guide rod at the connection point between it and several first pipes. The inner ring is sealed and slidably adapted to a valve plate. Several guide rods are fixedly connected in a ring array on the conical surface of the receiving cylinder, and the guide rods are coaxial with the axis of the valve plate.

[0010] Preferably, one end of the movable cylinder is fixedly connected to a receiving cylinder, and the receiving cylinder is slidably sleeved on the surface of the first roller shaft and fixedly connected to one of the first auxiliary roller sleeves. One end of the receiving cylinder is fixedly connected to a limiting slide rail, and the limiting slide rail is slidably sleeved on the surface of the first roller shaft.

[0011] Preferably, one end of the limiting slide rail is fixedly connected to a conical panel with an electric slider. The surface of the limiting slide rail is slidably adapted with a plurality of first mounting seats and a plurality of second mounting seats in a circular array. The plurality of first mounting seats are hinged to a main pressure roller assembly block through a top rod assembly, and the first mounting seats are hinged to the top rod assembly. The first mounting seats are fixedly connected to a push plate away from the partition through a push rod. The plurality of second mounting seats are hinged to a secondary pressure roller assembly block through a top rod assembly, and the second mounting seats are hinged to the top rod assembly. The second mounting seats are fixedly connected to a push plate near the partition through a push rod.

[0012] Preferably, the concave roller module includes a second roller with a cavity and a second main roller sleeve. The second roller is rotatably connected between the roller straightening machine frame and the second roller is symmetrically arranged with the first roller along the direction of the sheet material. The end of the second roller is connected to the output bearing of the air supply system, and the second main roller sleeve is sleeved on the surface of the second roller.

[0013] Preferably, a second auxiliary roller sleeve is sealed and inserted at both ends of the second main roller sleeve, and each of the second auxiliary roller sleeves has an outwardly convex conical surface arranged at one end.

[0014] Preferably, the leveling assembly includes two drive shaft groups symmetrically arranged along the direction of the sheet material. Each drive shaft group consists of several rotating shafts, and a transmission belt is arranged on the outside of each drive shaft group, with the transmission belt connected to the rotating shafts. This invention constructs a continuous straightening path by sequentially integrating the correction assembly, leveling assembly, and straightening assembly along the direction of travel. The correction assembly is responsible for prying open the "dead folds". The leveling assembly uses the bidirectional diagonal strips on the surface of its transmission belt to diagonally stretch the raised part, effectively releasing local concentrated stress. Finally, the straightening assembly completes the high-precision final straightening. This three-stage design realizes fully automatic and unmanned continuous operation from defect identification and pre-processing to fine straightening, reducing the processing time from minutes to seconds, and replacing the uncertainty of human experience with mechanical consistency.

[0015] Preferably, each of the drive belt surfaces is provided with bidirectional diagonal stripes.

[0016] Compared with the prior art, the beneficial effects of the present invention are: 1. This invention sets the straightening mechanism sequentially as a straightening component, a flattening component, and a straightening component. It utilizes the outer convex roller shaft module and the inner concave roller shaft module to form a conical guide path, creating a pair of force couples in opposite directions. This effectively prys open and lifts up the "dead bend" defect in aluminum alloy sheets that cannot be handled by traditional roller straightening processes. The flattening component then flattens the lifted area, and finally, the straightening component completes the precision straightening. This achieves online and automated repair of plastic damage such as "dead bends," breaking the industry dilemma of "dead bends equal scrap," and significantly improving the yield of sheet materials, production efficiency, and consistency of straightening quality.

[0017] 2. This invention constructs a continuous straightening path by sequentially integrating the correction component, the leveling component, and the straightening component along the direction of travel. The correction component is responsible for prying open the "dead bends". The leveling component uses the bidirectional diagonal strips on the surface of its transmission belt to stretch the raised part obliquely, effectively releasing local concentrated stress. Finally, the straightening component completes the high-precision final straightening. This three-stage design realizes fully automatic and unmanned continuous operation from defect identification and preprocessing to fine straightening, reducing the processing time from minutes to seconds, and replacing the uncertainty of human experience with mechanical consistency. Attached Figure Description

[0018] Figure 1 This is a three-dimensional structural diagram of the present invention; Figure 2 This is a schematic cross-sectional view of the overall structure of the present invention, showing the direction of the sheet material's travel. Figure 3 This is a three-dimensional cross-sectional view of the convex roller shaft module of the present invention; Figure 4 This is a schematic cross-sectional view of the convex roller shaft module of the present invention; Figure 5 This is a cross-sectional schematic diagram of the pusher plate structure of the present invention, to show the internal structure of the first pipe; Figure 6 This is a three-dimensional structural diagram of the valve plate of the present invention; Figure 7 This is a three-dimensional structural diagram of the main pressure roller assembly block of the present invention, showing the usage state in which the main pressure roller assembly block and the auxiliary pressure roller assembly block are brought together; Figure 8 This is a three-dimensional cross-sectional view of the concave roller shaft module of the present invention; Figure 9 This is a three-dimensional exploded view of the concave roller shaft module of the present invention; Figure 10 This is a schematic diagram of the structure of the sheet metal in use for handling dead bends according to the present invention; Figure 11 This is a three-dimensional structural diagram of the flattening component of the present invention.

[0019] Explanation of the numbers in the diagram: 1. Roller straightening frame; 2. Conveyor roller frame; 3. Air supply system; 4. Straightening mechanism; 5. Straightening assembly; 51. Convex roller module; 511. First roller; 512. First main roller sleeve; 5121. T-shaped passageway; 513. First auxiliary roller sleeve; 514. Movable cylinder; 515. Push plate; 516. First pipe; 517. Slot; 518. Insert cylinder; 519. Inner ring; 5110. Valve plate; 5111, Receiving cylinder; 5112, Limiting slide rail; 5113, Conical panel; 5114, Main pressure roller assembly block; 5115, Auxiliary pressure roller assembly block; 5116, Guide rod; 52, Concave roller shaft module; 521, Second roller shaft; 522, Second main roller sleeve; 523, Second auxiliary roller sleeve; 5231, Outer convex conical surface; 6, Leveling assembly; 61, Drive shaft assembly; 62, Transmission belt; 621, Bidirectional inclined bar; 7, Straightening assembly. Detailed Implementation

[0020] like Figures 1-2 As shown, the present invention relates to a roller straightening device for aluminum alloy sheets, comprising a roller straightening frame 1, a conveying roller frame 2 arranged at the input end of the roller straightening frame 1, an air supply system 3 arranged on one side of the roller straightening frame 1, and a straightening mechanism 4 arranged inside the roller straightening frame 1.

[0021] Specifically, the conveying roller frame 2 includes rollers for conveying aluminum alloy sheets and drive motors for driving the rollers to rotate, both of which are existing conventional technologies and will not be described in detail here. The aluminum alloy sheets are conveyed into the roller straightening frame 1 and then straightened. The air supply system 3 is also existing conventional technology and will not be described in detail here. It is a hydraulically driven air compressor system, using a hydraulic system (composed of pumps, valves, and pipelines) as the prime mover to drive a hydraulic motor or hydraulic cylinder, which in turn directly drives the core mechanical components of the air compressor (such as screws and pistons) to generate compressed air, which is then delivered to the straightening mechanism 4. A guide plate is arranged at the input end of the roller straightening frame 1. The guide plate is equipped with vision sensors that perform real-time sheet position detection, edge centering calibration, and preliminary identification and positioning of macroscopic defects on the sheet surface (such as obvious "dead folds," scratches, or foreign objects), providing initial state feedback and prediction information for subsequent straightening processing, thereby ensuring that the sheet is accurately and smoothly guided into the straightening path of the straightening mechanism 4.

[0022] like Figure 2 As shown, the straightening mechanism 4 in this embodiment includes a set of straightening components 5, a set of flattening components 6, and a set of straightening components 7. The straightening components 5, flattening components 6, and straightening components 7 are arranged sequentially along the direction of material travel, forming a continuous straightening path. The straightening path consists of two interconnected sections: the front section is a tapered guide path, and the rear section is a straight path. The effective working width of the straight path is less than the minimum exit width of the tapered guide path. Specifically, the tapered guide path is composed of a set of straightening components 5 and a set of flattening components 6, and its width gradually converges along the direction of material travel. The straight path is composed of straightening components 7, which are used to straighten the material that has been pre-treated by the tapered guide path. Furthermore, the straightening components 5, flattening components 6, and straightening components 7 are all driven by motors, causing the material to be straightened in the straightening path.

[0023] Combination Figure 2 As shown, in this embodiment, the straightening component 5 includes a set of convex roller shaft modules 51 and a set of concave roller shaft modules 52. The convex roller shaft modules 51 and the concave roller shaft modules 52 are symmetrically arranged along the direction of the sheet material, and together form the input end of the tapered guide path. The convex roller shaft modules 51 apply force to the dead fold position of the sheet material, and the concave roller shaft modules 52 apply constraint force to the dead fold position of the sheet material (i.e., the edge or corner of the sheet material is pressed together), forming a pair of force couples in opposite directions. This can effectively close or press the opening at the dead fold position of the sheet material, so that the fold area produces preliminary plastic stretching, thereby creating favorable mechanical conditions for the subsequent flattening component 6 to perform more thorough flattening and stretching pretreatment of the sheet material.

[0024] Combination Figures 3-7 and Figure 10As shown, in this embodiment, the external convex roller shaft module 51 includes a first roller shaft 511 with a cavity. The first roller shaft 511 is rotatably connected between the roller straightening machine frame 1, and the end of the first roller shaft 511 is connected to the output bearing of the air supply system 3. A first main roller sleeve 512 is sleeved on the surface of the first roller shaft 511. A first auxiliary roller sleeve 513 is slidably sleeved on the surface of the first roller shaft 511 at both ends of the first main roller sleeve 512. The first main roller sleeve 512 is divided into two driving cavities by a partition. A T-shaped channel 5121 is arranged on the partition. A T-shaped three-way ball valve is arranged in the T-shaped channel 5121, so that several T-shaped channels 5121 can be independently connected to one or two driving cavities, or the two driving cavities are not connected, so as to achieve precise control of the pressure state of the driving cavity.

[0025] In this embodiment, the components arranged inside the two drive cavities are identical in structure and function. Therefore, the components inside one of the drive cavities will now be described: A movable cylinder 514 is slidably fitted inside the drive cavity. Two push plates 515 are slidably fitted inside the movable cylinder 514, and a pressure chamber is formed between the two push plates 515. One of the push plates 515 has a plurality of first pipes 516 fixedly connected in a ring array on one side. Each first pipe 516 has a slot 517 on its side surface. The other push plate 515 has a plug cylinder 518 fixedly connected in a ring array on one side. A plug plate is fixedly connected to the inner wall of each plug cylinder 518, and the plug plate is slidably fitted inside the first pipe 516. An inner ring 519 with a guide rod is fitted at the connection between one of the push plates 515 and the plurality of first pipes 516. A valve plate 5110 is slidably fitted inside the inner ring 519. A receiving cylinder 5111 is fixedly connected to one end of the movable cylinder 514, and the receiving cylinder 5111 is slidably fitted inside the movable cylinder 514. The receiving cylinder 5111 is fixedly connected to one of the first auxiliary roller sleeves 513 on the surface of the first roller shaft 511. One end of the receiving cylinder 5111 is fixedly connected to a limiting slide rail 5112, and the limiting slide rail 5112 is slidably sleeved on the surface of the first roller shaft 511. One end of the limiting slide rail 5112 is fixedly connected to a conical panel 5113 with an electric slider. The surface of the limiting slide rail 5112 is slidably fitted with a number of first mounting seats and a number of second mounting seats in a circular array. The number of first mounting seats are hinged to the main pressure roller through a top rod assembly. The assembly block 5114 is assembled, and the first mounting seat is hinged to the top rod assembly. The first mounting seat is fixedly connected to the push plate 515 away from the partition through the push rod. Several second mounting seats are hinged to the auxiliary pressure roller assembly block 5115 through the top rod assembly. The second mounting seats are hinged to the top rod assembly. The second mounting seats are fixedly connected to the push plate 515 near the partition through the push rod. Several guide rods 5116 are fixedly connected in a ring array on the conical surface of the receiving cylinder 5111. The guide rods 5116 are coaxial with the axis of the valve plate 5110.

[0026] Specifically, when the vision sensors arranged on the guide plate of the roller straightening machine frame 1 detect a dead bend at the edge of the plate, the electric slider drives the conical panel 5113 to move axially along the first roller shaft 511. Because the conical panel 5113, the limiting slide rail 5112, the first auxiliary roller sleeve 513, the receiving cylinder 5111, and the movable cylinder 514 slide synchronously on the surface of the first roller shaft 511, the conical panel 5113 and the gap formed between the conical panel 5113 and the first auxiliary roller sleeve 513 can be precisely positioned at the dead bend in the plate. Simultaneously, the opening and closing of the T-type three-way ball valve allows the... The T-shaped passageway 5121 is connected to the drive cavity to maintain stable internal pressure and prevent negative pressure. After the component and the plate are aligned and positioned at the dead bend, the conical panel 5113 is fixed. By filling the drive cavity with gas, it is under positive pressure. At this time, the two push plates 515 move synchronously and drive several main pressure roller assemblies 5114 and several auxiliary pressure roller assemblies 5115 to move via push rods. The main pressure roller assemblies 5114 are located in the gap between the conical panel 5113 and the first auxiliary roller sleeve 513, and one side of them is flush with the conical panel 5113. 3. Contact occurs, therefore, several main pressure roller assembly blocks 5114 move radially and unfold. When several auxiliary pressure roller assembly blocks 5115 move to the gap formed between the conical panel 5113 and the first auxiliary roller sleeve 513, one side of them contacts the conical panel 5113, and the guide rod 5116 contacts the valve plate 5110 and pushes it out, so that the push plate 515 near the partition moves towards another push plate 515, and the gas in its air pressure chamber can be discharged from the first pipe 516. Then, the push rod applies force again to the several auxiliary pressure roller assembly blocks 5115, causing them to unfold radially and contact... Several main pressure roller assembly blocks 5114 together form a cam structure to press and fold the dead folds on the sheet metal, causing the folded openings to curl up. After the processing is completed, the sheet metal with dead folds enters the next process. The unfolded main pressure roller assembly blocks 5114 and several auxiliary pressure roller assembly blocks 5115, driven by the negative pressure state of the drive cavity, move radially in sequence and converge. Driven by the electric slider, the conical panel 5113, the limiting slide rail 5112, the first auxiliary roller sleeve 513, the receiving cylinder 5111, and the movable cylinder 514 return to their initial positions for conveying subsequent sheet metal.

[0027] Combination Figures 8-10As shown, in this embodiment, the concave roller module 52 includes a second roller 521 with a cavity and a second main roller sleeve 522. The second roller 521 is rotatably connected between the roller straightening machine frame 1, and the second roller 521 and the first roller 511 are symmetrically arranged along the direction of the plate movement. The end of the second roller 521 is connected to the output bearing of the air supply system 3. The second main roller sleeve 522 is sleeved on the surface of the second roller 521. It should be noted that the first roller 511 and the second roller 521, the first main roller sleeve 512 and the second main roller sleeve 522 are completely identical in structure and function, so they will not be described again here. The two ends of the second main roller sleeve 522 are sealed and inserted with second auxiliary roller sleeves 523. Each second auxiliary roller sleeve 523 has an outwardly convex conical surface 5231 arranged at one end.

[0028] Specifically, when the vision sensor arranged on the guide plate of the roller straightening machine frame 1 detects a dead bend at the edge of the plate, gas is filled into the drive cavity on the second main roller sleeve 522, causing the second auxiliary roller sleeve 523 to move axially along the second roller shaft 521 to the position of the dead bend in the plate. It then works in conjunction with several auxiliary pressure roller assembly blocks 5115 and several main pressure roller assembly blocks 5114 to form a cam structure. The cam structure applies force to the dead bend in the plate, and the second auxiliary roller sleeve 523 guides the pressure point of the dead bend in the plate through the convex conical surface 5231, causing the opening of the dead bend to be lifted.

[0029] The straightening mechanism 4 of this invention achieves online and automated repair of "dead fold" defects in aluminum alloy sheets for the first time. This mechanism, through the collaboration of a vision sensor, an air supply system 3, and a pneumatic servo drive component, controls the straightening assembly 5 to precisely position and apply force. Specifically, the cam structure of the outer convex roller module 51 and the guide cone surface of the inner concave roller module 52 form a pair of opposite-direction force couples, effectively prying open the closed metal fibers of the "dead fold" and transforming it from an irreversible plastic fold state into a resilient-plastic deformation state that can be subsequently processed. This solves the technical problem in the prior art where roller straighteners are completely ineffective against "dead fold" type plastic instability defects, leading to the forced scrapping of high-value sheets.

[0030] Combination Figure 11 As shown, in this embodiment, the flattening component 6 includes two drive shaft groups 61 symmetrically arranged along the direction of the sheet material. Each drive shaft group 61 is composed of several rotating shafts. A transmission belt 62 is arranged on the outside of each drive shaft group 61, and the transmission belt 62 is connected to the rotating shaft. A bidirectional diagonal strip 621 is arranged on the surface of each transmission belt 62. Specifically, when the edge of the sheet material curls up at the dead bend, it passes through the bidirectional diagonal strip 621 on the two transmission belts 62 and is flattened to both sides of the sheet material from the center line position.

[0031] This invention constructs a continuous straightening path by sequentially integrating the straightening component 5, the leveling component 6, and the straightening component 7 along the travel direction. The straightening component 5 is responsible for prying open the "dead bends". The leveling component 6 uses the bidirectional diagonal strips 621 on the surface of its transmission belt 62 to stretch the raised part obliquely, effectively releasing local concentrated stress. Finally, the straightening component 7 completes the high-precision final straightening. This three-stage design realizes fully automatic and unmanned continuous operation from defect identification, pre-processing to fine straightening, reducing the processing time from minutes to seconds, and replacing the uncertainty of human experience with mechanical consistency.

[0032] Working Principle: This embodiment provides a roller straightening device for aluminum alloy sheets. The sheet material is inspected in real time by a vision sensor at the input end of the roller straightening frame 1 to detect dead bend defects. Then, the electric slider drives the conical panel 5113 to move axially, causing the entire first auxiliary roller sleeve 513 assembly to slide synchronously. This ensures that the straightening interval between the conical panel 5113 and the first auxiliary roller sleeve 513 is precisely aligned to the "dead bend" position. Simultaneously, the T-type three-way ball valve operates synchronously to ensure stable pressure in the corresponding drive chamber. At the same time, the concave roller shaft module 52 receives the same position signal, inflates its drive chamber, and drives the second auxiliary roller sleeve 523 to move axially. Its convex conical surface 5231 is also precisely positioned below the "dead bend" position, vertically aligned with the straightening interval of the upper convex module, forming a "clamping" posture to prepare for the next step of precise force application.

[0033] After the dead fold position of the sheet metal is calibrated and positioned, the drive cavity of the convex roller shaft module 51 is filled with high-pressure gas, which drives the two push plates 515 to move synchronously. Then, the push rod drives the main pressure roller assembly block 5114 and the auxiliary pressure roller assembly block 5115 to expand radially. The main pressure roller assembly block 5114 expands first to form a force application point, and the auxiliary pressure roller assembly block 5115 expands subsequently. The guide rod 5116 pushes open the valve plate 5110 to realize the exhaust of the air pressure chamber and the application of secondary force, which together form a cam structure. At the same time, the second auxiliary roller sleeve 523 in the concave roller shaft module 52 uses its convex conical surface 5231 as a guide and support surface. The upper and lower modules work together to form a pair of force couples in opposite directions: the upper cam structure applies a concentrated downward squeezing force to the "dead fold" crease, while the lower convex conical surface 5231 provides an upward constraint force and precise deformation guidance at the same position. The two work together to effectively pry open and unfold the "dead fold", which is an irreversible plastic fold, and transform it into an open and upturned elastic-plastic deformation state.

[0034] The pried-open and raised section of the board material then enters the flattening assembly 6. The bidirectional diagonal strips 621 on the drive belts 62 on both sides of this assembly act like two "combs," starting from the center line of the raised section and simultaneously and symmetrically stretching and smoothing the board at an inclined angle to both sides. The flattened board then enters the straightening assembly 7. Since the "dead fold" defect has been successfully transformed into a regular unevenness problem, and after the stress release process, it can be finally straightened with high precision using conventional multi-roller straightening technology to achieve the required flatness standard.

[0035] The embodiments disclosed in this invention are preferred embodiments, but are not limited thereto. Those skilled in the art can easily understand the spirit of this invention based on the above embodiments and make different extensions and variations, but as long as they do not depart from the spirit of this invention, they are all within the protection scope of this invention.

Claims

1. A roller straightening device for aluminum alloy sheets, comprising a roller straightening frame (1), a conveying roller frame (2) arranged at the input end of the roller straightening frame (1), an air supply system (3) arranged on one side of the roller straightening frame (1), and a straightening mechanism (4) arranged inside the roller straightening frame (1), characterized in that, The straightening mechanism (4) includes a straightening component (5), a flattening component (6), and a straightening component (7); The correction component (5), the flattening component (6), and the straightening component (7) are arranged sequentially along the direction of the plate's travel, forming a continuous straightening path. The straightening path consists of two interconnected sections: the front section is a tapered guide path, and the rear section is a straight path. The tapered guide path is composed of a straightening component (5) and a flattening component (6), and its width gradually converges along the direction of the plate's travel. The straight path is composed of a straightening component (7), which is used to straighten the plate that has been pre-treated by the tapered guide path. The correction component (5) includes an externally convex roller shaft module (51) and an internally concave roller shaft module (52), which are symmetrically arranged along the direction of the sheet material. The convex roller module (51) applies force to the dead fold position of the plate, and the concave roller module (52) applies constraint force to the dead fold position of the plate, forming a pair of force couples in opposite directions, which can lift up the opening at the dead fold of the plate, and then the flattening component (6) flattens the opening at the dead fold of the plate to both sides of the plate.

2. The roller straightening device for aluminum alloy sheets according to claim 1, characterized in that, The externally protruding roller module (51) includes a first roller (511) with a cavity. The first roller (511) is rotatably connected between the roller straightening frame (1), and the end of the first roller (511) is connected to the output bearing of the air supply system (3). A first main roller sleeve (512) is sleeved on the surface of the first roller (511). A first auxiliary roller sleeve (513) is slidably sleeved on the surface of the first roller (511) at both ends of the first main roller sleeve (512). The first main roller sleeve (512) is divided into two driving cavities by a partition. A T-shaped passage (5121) is arranged on the partition. A T-shaped three-way ball valve is arranged in the T-shaped passage (5121). Several of the aforementioned T-shaped passageways (5121) can be independently connected to one or two drive chambers via T-shaped three-way ball valves, or not connected to either of the two drive chambers.

3. A roller straightening device for aluminum alloy sheets according to claim 2, characterized in that, Each of the drive cavities is fitted with a movable cylinder (514) inside, and each movable cylinder (514) is fitted with two push plates (515) inside, and a pneumatic cavity is formed between the two push plates (515). One of the push plates (515) forming the pneumatic cavity has a plurality of first pipes (516) fixedly connected to one side in a ring array, and each of the first pipes (516) has a slot (517) on its side surface. The other push plate (515) has a plug cylinder (518) fixedly connected to one side in a ring array.

4. A roller straightening device for aluminum alloy sheets according to claim 3, characterized in that, Each of the inserts (518) has a plug plate fixedly connected to its inner wall, and the plug plate is slidably adapted to the inside of the first pipe (516). One of the push plates (515) is connected to the first pipe (516) with an inner ring (519) with a guide rod at the connection point. The inner ring (519) is sealed and slidably adapted to a valve plate (5110).

5. A roller straightening device for aluminum alloy sheets according to claim 4, characterized in that, One end of the movable cylinder (514) is fixedly connected to a receiving cylinder (5111), and the receiving cylinder (5111) is slidably sleeved on the surface of the first roller shaft (511) and fixedly connected to one of the first auxiliary roller sleeves (513). One end of the receiving cylinder (5111) is fixedly connected to a limiting slide rail (5112), and the limiting slide rail (5112) is slidably sleeved on the surface of the first roller shaft (511).

6. A roller straightening device for aluminum alloy sheets according to claim 5, characterized in that, One end of the limiting slide rail (5112) is fixedly connected to a conical panel (5113) with an electric slider. The surface of the limiting slide rail (5112) is slidably fitted with a number of first mounting seats and a number of second mounting seats in a ring array. The number of first mounting seats are hinged to a main pressure roller assembly (5114) through a top rod assembly, and the first mounting seats are hinged to the top rod assembly. The first mounting seats are fixedly connected to a push plate (515) away from the partition through a push rod. The number of second mounting seats are hinged to a secondary pressure roller assembly (5115) through a top rod assembly, and the second mounting seats are hinged to the top rod assembly. The second mounting seats are fixedly connected to a push plate (515) near the partition through a push rod. The receiving cylinder (5111) is fixedly connected to a number of guide rods (5116) in a ring array on a conical surface, and the guide rods (5116) are coaxial with the axis of the valve plate (5110).

7. A roller straightening device for aluminum alloy sheets according to claim 6, characterized in that, The concave roller module (52) includes a second roller (521) with a cavity and a second main roller sleeve (522). The second roller (521) is rotatably connected between the roller straightening frame (1) and the second roller (521) and the first roller (511) are symmetrically arranged along the direction of the plate. The end of the second roller (521) is connected to the output bearing of the air supply system (3). The second main roller sleeve (522) is sleeved on the surface of the second roller (521).

8. A roller straightening device for aluminum alloy sheets according to claim 7, characterized in that, The second main roller sleeve (522) is sealed and inserted with a second auxiliary roller sleeve (523) at both ends, and each second auxiliary roller sleeve (523) has an outwardly convex conical surface (5231) arranged at one end.

9. A roller straightening device for aluminum alloy sheets according to claim 8, characterized in that, The leveling assembly (6) includes two drive shaft groups (61) symmetrically arranged along the direction of the sheet material. Each drive shaft group (61) is composed of several rotating shafts. A transmission belt (62) is arranged on the outside of each drive shaft group (61), and the transmission belt (62) is connected to the rotating shafts in a transmission connection.

10. A roller straightening device for aluminum alloy sheets according to claim 9, characterized in that, Each of the drive belts (62) has bidirectional diagonal strips (621) arranged on its surface.

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