Arc changing device

Abstract

The utility model discloses an arc changing device which comprises a conveying assembly, a first arc changing assembly and a second arc changing assembly. The arc changing mechanism comprises an arc changing driving piece, an arc changing piece and two arc changing guiding pieces, and the arc changing piece is connected with the conveying assembly and used for guiding the conveying assembly to change an arc; the two arc changing guide pieces are connected to the two ends of the arc changing piece in the arc changing direction correspondingly. The two arc changing guiding pieces are both connected to the arc changing driving piece, the arc changing driving piece is used for unwinding the arc changing guiding pieces, and the arc changing guiding pieces are used for driving the arc changing pieces to change arcs in the unwinding process. In the specific using process, a workpiece is conveyed to the arc changing piece through the conveying assembly, then the two arc changing guiding pieces are driven to be unwound through the single arc changing driving piece at the same time so as to drive the arc changing piece to be subjected to arc changing, the whole structure is simple, meanwhile, the unwinding synchronism of the two arc changing guiding pieces can be guaranteed, and the arc changing effect is improved.

Description

Technical Field

[0001] This utility model relates to the technical field of glass bending equipment, and in particular to a variable arc device. Background Technology

[0002] Glass bending and tempering equipment is a specialized industrial device primarily used to process flat glass into bent tempered glass with a specific curvature and significantly increased strength. The curvature-changing mechanism is a key component in the bending equipment used to achieve changes in the curvature of the glass. It typically consists of two or more curvature-changing guides (such as ropes or chains) connected to the curvature-changing component, which then guides the curvature-changing component to bend and deform, thus causing the glass on the curvature-changing component to bend and deform. In existing curvature-changing mechanisms, the curvature-changing guides are usually symmetrically distributed on both sides of the frame, and then two drive components provide power to two transmission shafts respectively. The structure is relatively complex and inconvenient to maintain. Furthermore, it is difficult to ensure complete synchronization of the unwinding and winding of the two curvature-changing guides under various working conditions, as the two drive components and two transmission shafts need to be synchronized. Small asynchronys may accumulate over time, causing deviations in the deformation of the curvature-changing component and affecting the curvature-changing effect.

[0003] Furthermore, when the arc is reduced to a small radius, the lifting angle approaches vertical. Because the two arc guides are distributed on both sides, less of the lifting force is converted into the arc component, which can lead to incomplete arcing and affect the arcing effect. Utility Model Content

[0004] In order to overcome at least one of the defects of the prior art, the present invention provides a variable arc device, which drives two variable arc guides to unwind simultaneously through a single variable arc drive component. The device has a simple structure and ensures the synchronicity of unwinding of the two variable arc guides, thereby improving the variable arc effect.

[0005] The technical solution adopted by this utility model to solve its problem is:

[0006] An arc-changing device, comprising:

[0007] A conveying assembly for conveying a workpiece;

[0008] An arc-changing mechanism includes an arc-changing drive, an arc-changing component, and two arc-changing guides. The arc-changing component is connected to the conveying assembly and is used to guide the conveying assembly to change arc. The two arc-changing guides are respectively connected to both ends of the arc-changing component in the arc-changing direction. Both arc-changing guides are connected to the arc-changing drive, and the arc-changing drive is used to unwind the arc-changing guides. The arc-changing guides are used to drive the arc-changing component to change arc during the unwinding process.

[0009] Furthermore, the arc-changing drive component includes a drive motor and a drive shaft. The drive motor is used to drive the drive shaft to rotate. One end of each of the two arc-changing guides is connected to the drive shaft, and the other end of each of the two arc-changing guides is connected to both ends of the arc-changing direction of the arc-changing component. The arc-changing guides are used to unwind when the drive shaft rotates.

[0010] Furthermore, the centerline of the variable arc component is tangent to the outer periphery of the drive shaft.

[0011] Furthermore, the variable arc guide includes a chain, which is pivotally connected to the drive shaft via a sprocket. Both chains are wound around the sprocket from the same side and engage with it. The centerline of the variable arc guide is tangent to the outer periphery of the sprocket.

[0012] Furthermore, the sprocket is a double-row sprocket, which is sleeved on the drive shaft, and the two chains are respectively wound around the double-row sprocket.

[0013] Furthermore, four variable arc guides are provided, with each pair of variable arc guides distributed at both ends of the drive shaft and connected to the variable arc member respectively.

[0014] Furthermore, the arc-changing component includes a forming roller track and arc-forming components disposed on both sides of the forming roller track. The forming roller track includes a plurality of forming rollers, and the arc-forming component includes a plurality of linkage plates. Two adjacent linkage plates are hinged together, and the forming rollers are rotatably connected to the linkage plates. Two arc-changing guides are respectively connected to the linkage plates located at the ends and are used to lift the linkage plates so that the two adjacent forming rollers rotate relative to each other to achieve arc changing.

[0015] Furthermore, it also includes a mounting bracket, which is disposed above the arc-changing component and is used to mount the arc-changing drive component.

[0016] Furthermore, the mounting frame is provided with two brackets, which are respectively located at both ends of the mounting frame and connected to both ends of the drive shaft to support the drive shaft.

[0017] In summary, the arc-changing device provided by this utility model has the following technical effects:

[0018] In practical use, the workpiece is transported to the arc-changing component via a conveying assembly. Then, a single arc-changing drive unit connects to two arc-changing guide units simultaneously, driving the two guide units to unwind at the same time, thus causing the arc-changing component to arc. This eliminates the need for multiple drive shafts or power sources, making the entire structure relatively simple and easy to maintain later. Furthermore, by synchronously driving the two guide units to unwind with a single arc-changing drive unit, the unwinding speed and stroke of the two lifting cables are consistent, avoiding problems such as uneven or asymmetrical deformation of the arc-changing component caused by asynchronous control of the two drive units. This ensures the smoothness and accuracy of the arc-changing process, which is beneficial to improving the deformation quality and precision of the arc-changing component.

[0019] Furthermore, since one end of each of the two arc-changing guides is connected to the same driving component, and the other end is connected to both ends of the arc-forming plate, the driving component serves as a common connection point. This allows the force to be distributed to the two arc-changing guides at a more reasonable angle when it is transmitted to them. When the plate is lifted, a specific angle is formed between the arc-changing guide and the arc-forming plate. This angle is more conducive to decomposing the lifting force in the arc-changing direction, allowing the force to be transmitted more directly to the arc-forming plate for arc-changing. This increases the arc-changing component force applied to the arc-changing component and improves the arc-changing effect. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the arc-changing component in this utility model in an arc-changing state;

[0021] Figure 2 This is a structural schematic diagram of another state of the arc-changing component in this utility model;

[0022] Figure 3 This is a schematic diagram of the structure of this utility model from another perspective.

[0023] The meanings of the reference numerals in the attached figures are as follows:

[0024] 10. Mounting bracket; 11. Arc-changing component; 111. Centerline of arc-changing component; 12. Bracket; 20. Arc-changing guide; 21. Double-row sprocket; 30. Drive motor; 31. Drive shaft. Detailed Implementation

[0025] To better understand and implement this invention, the technical solutions in the embodiments of this invention will be clearly and completely described below with reference to the accompanying drawings.

[0026] In the description of this utility model, it should be noted that the terms "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", and "outer" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, 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 this utility model.

[0027] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention.

[0028] See Figures 1 to 3 This utility model discloses an arc-changing device, including a conveying assembly and an arc-changing mechanism. The conveying assembly is used to convey the workpiece. The arc-changing mechanism includes an arc-changing drive, an arc-changing component 11, and two arc-changing guides 20. The arc-changing component 11 is connected to the conveying assembly and is used to guide the conveying assembly to change arc. The two arc-changing guides 20 are respectively connected to the two ends of the arc-changing direction of the arc-changing component 11. Both arc-changing guides 20 are connected to the arc-changing drive. The arc-changing drive is used to unwind the arc-changing guides 20. During the unwinding process, the arc-changing guides 20 drive the arc-changing component 11 to change arc.

[0029] Based on the above structure, during assembly, the arc-changing drive component is placed on the extension line of the center line 111 of the arc-changing component. In the initial state, the two arc-changing guide components 20 are in an unfolded state, and the arc-changing component 11 is in a straight arc state. When it is necessary to perform arc-changing operations on the workpiece, the workpiece can be transported to the arc-changing component 11 through a conveying component (such as a belt conveyor or roller conveyor). Then, the arc-changing drive component drives the arc-changing guide component 20 to wind and gradually shorten. During the slow winding process, the arc-changing guide component 20 will drive the arc-changing component 11 to bend and deform according to a specific curve shape to achieve arc-changing. After the arc-changing is completed, the two arc-changing guide components 20 can be reset by the arc-changing drive component, and then a new round of arc-changing operations can begin.

[0030] By using a single arc-changing drive component to synchronously drive two arc-changing guide components 20 to unwind, the unwinding speed and stroke of the two lifting cables are consistent. This avoids problems such as uneven and asymmetrical deformation of the arc-changing component 11 caused by asynchronous control of the two arc-changing drive components, ensuring the stability and accuracy of the arc-changing process, and improving the deformation quality and precision of the arc-changing component 11.

[0031] Specifically, since one end of each of the two arc-changing guides 20 is connected to a single arc-changing drive, and the other end is connected to both ends of the arc-changing component 11, and since the arc-changing drive is located on the center line 111 of the arc-changing component, the arc-changing drive serves as a common connection point. After the other ends of the two arc-changing guides 20 are connected to both ends of the arc-changing component 11, a certain angle can be formed at the connection between the arc-changing guides 20 and the arc-changing component 11. When lifting, this angle is more conducive to decomposing the lifting force in the arc-changing direction, so that the force can be transmitted more directly to the arc-changing component 11 for arc-changing, thereby increasing the arc-changing component force applied to the arc-changing component 11 and improving the arc-changing effect.

[0032] More specifically, with the arc-changing drive unit located at the center line 111 of the arc-changing component as the core, and the two ends of the arc-changing component 11 connected by two arc-changing guides 20, a relatively symmetrical and stable triangular structure is formed. When the force applied by the drive unit is transmitted to the two ends of the arc-changing component 11 through the two arc-changing guides 20, the pulling force of the two arc-changing guides 20 can be better combined into a resultant force that is conducive to the arc-changing component 11. Even if the lifting angle is close to vertical, due to the angle relationship between the two pulling forces and the direction of the resultant force, the component of the resultant force in the arc-changing direction of the arc-changing component 11 is relatively larger, which can more effectively push the arc-changing component 11 to achieve arc changing and improve the efficiency of force utilization.

[0033] Meanwhile, during the arc-changing process, especially under complex working conditions such as the lifting angle being close to vertical, the triangular structure can better resist interference forces from all directions, maintain the stability of the arc-changing component 11, and ensure that the arc-changing effect is not affected by factors such as shaking or displacement during the arc-changing process, thus providing a stable structural foundation for the arc-changing process.

[0034] It should be noted that the arc guide 20 in this embodiment can be made of existing ropes (such as steel wire ropes), chains, or belts (such as synchronous belts or V-belts). In specific assembly, a frame, bracket 12, or support plate can be set above the arc guide 11 to support the arc drive. When the arc guide 20 is made of rope, two ropes can be directly wound onto the output shaft of the arc drive from the same side to ensure that the winding direction of the two ropes is consistent. Then, the arc drive provides power to drive the output shaft to rotate, thereby realizing the unwinding of the two ropes. Alternatively, a winding wheel can be fixed on the output shaft of the arc drive. When the power output shaft of the arc drive rotates, it drives the winding wheel to rotate. At this time, the winding wheel winds up and unwinds the ropes, and the tension of the ropes drives the two arc guides 20 to rotate. This connection method can achieve different rotation effects of the arc guides 20 by adjusting the winding method and length of the ropes, which has a certain degree of flexibility.

[0035] When the arc guide 20 is a chain, two gears are installed on the output shaft of the arc drive and fixed together. One end of each chain is installed on the two gears, and the two chains are wound onto the gears from the same side to ensure that the winding directions are consistent. When the drive drives the output shaft to rotate, the gears on the output shaft drive the two chains meshing with them to rotate, thereby driving the two chains to wind or unwind synchronously. Alternatively, a double-row gear can be set on the output shaft to pivotally connect the two chains at the same time, which can achieve the same effect.

[0036] When the arc-changing guide 20 is selected as a synchronous belt or V-belt, a synchronous pulley or gear can be set on the output shaft of the arc-changing drive to pass through the arc-changing guide 20, so that the synchronous pulley or gear can be driven to rotate by the rotation of the output shaft, thereby driving the synchronous belt or V-belt to wind up and unwind, thus realizing the arc-changing.

[0037] Alternatively, the arc-changing component 11 can be a sheet structure made of a highly elastic metal material, such as spring steel, like a metal spring sheet. During unwinding, the metal spring sheet is subjected to the force of the arc-changing guide 20 and will undergo elastic deformation according to the shape and movement of the guide, thereby achieving bending and arc-changing. Or it can be composed of multiple metal links connected by pins or hinges, similar to a chain structure. Each link can rotate relatively independently. When subjected to the action of the arc-changing guide 20, the connection points between the links will rotate, allowing the entire structure to bend and arc-changing according to the trajectory of the guide. Of course, the arc-changing component 11 can also be a flexible joint structure formed by connecting multiple hinges. The hinge joints can allow adjacent components to rotate relative to each other within a certain angle range. By reasonably arranging the position and number of hinges, the arc-changing component 11 can bend and arc-changing according to a specific path during unwinding. The specific working principle and effect of the arc-changing component 11 will not be described in detail in this embodiment.

[0038] Furthermore, the arc-changing drive includes a drive motor 30 and a drive shaft 31. The drive motor 30 is used to drive the drive shaft 31 to rotate. One end of each of the two arc-changing guides 20 is connected to the drive shaft 31, and the other end of each of the two arc-changing guides 20 is connected to the two ends of the arc-changing direction of the arc-changing component 11. The arc-changing guides 20 are used to unwind when the drive shaft 31 rotates.

[0039] Specifically, after connecting one end of each of the two arc-changing guides 20 to a single drive shaft 31 and the other end to the two ends of the arc-changing component 11 in the arc-changing direction, a triangular structure is formed between the two arc-changing guides 20 and the arc-changing component 11. The triangular structure has natural stability and can effectively resist external interference and deformation during the arc-changing process, thereby enhancing the structural stability of the entire arc-changing system. This stable structure can provide reliable support for the arc-changing chain when the arc-changing component changes to a small radius, enabling the chain to better transmit force and reduce force loss caused by structural deformation or swaying. This ensures that the arc-changing chain can provide more arc-changing force and ensures the smooth progress of the arc-changing action.

[0040] Furthermore, when the arc-changing component 11 changes to a small radius, the pulling force of the arc-changing guide 20 can be decomposed into an arc-changing component along the arc-changing direction and a component in other directions according to the principle of force decomposition. Since the two arc-changing guides 20 are respectively connected to the two ends of the arc-changing component 11, the force they apply can be decomposed at a more reasonable angle, so that the component in the arc-changing direction accounts for a relatively large proportion. Compared with other arc-changing methods, the pulling force of the arc-changing guide 20 can be more effectively converted into an effective component force to push the arc-changing component 11 to change arc, thereby ensuring that there is enough force to push the arc-changing component 11 to complete the arc-changing action when changing arc at a small radius.

[0041] It should be noted that the drive motor 30 in this embodiment can be an existing servo motor, stepper motor, DC motor or AC motor, etc.

[0042] Furthermore, the centerline 111 of the arc-changing component is tangent to the outer periphery of the drive shaft 31.

[0043] Specifically, such as Figure 1 As shown in Figure 2, after the center line 111 of the arc-changing component is tangent to the outer periphery of the drive shaft 31, the center line 111 of the arc-changing component evenly divides the angle formed by the line connecting the center of the drive shaft 31 and the connection point of the two arc-changing guides 20 into two, so that the force acting on the arc-changing component 11 has better symmetry. The force applied by the two arc-changing guides 20 can be distributed more evenly on both sides of the arc-changing component 11. When the drive shaft 31 rotates and drives the arc-changing guides 20 to move, this symmetrical and uniform force distribution can make the arc-changing guides 20 more balanced in the process of arc lifting, avoiding the movement deviation of the arc-changing component 11 caused by excessive force on one side and insufficient force on the other side. Thus, the arc-changing guides 20 can lift the arc at a more reasonable angle, effectively improving the arc lifting angle.

[0044] It should be noted that when the arc guide 20 is connected to the outer periphery of the drive shaft 31 through a structure such as a gear, sprocket, or winding wheel, the center line 111 of the arc guide is tangent to the outer periphery of the wheel-shaped structure such as the gear, sprocket, or winding wheel.

[0045] Preferably, the arc-changing guide 20 in this embodiment includes a chain. During assembly, the chain is pivotally connected to the drive shaft 31 via a sprocket, and both chains are wound onto the sprocket from the same side and engaged with it, so that the winding directions of the two chains are consistent. Thus, when the drive shaft 31 drives the sprocket to rotate, the two chains can be wound or unwound synchronously to effectively guide the arc-changing component 11 to change arc.

[0046] Based on this structure, the center line 111 of the arc-changing component is tangent to the outer periphery of the sprocket, which makes the force acting on the arc-changing component 11 more symmetrical, and the force applied by the two arc-changing guides 20 can be distributed more evenly on both sides of the arc-changing component 11.

[0047] Compared to ropes and belts, especially non-metallic arc-changing guides 20, chains are typically made of metal, such as carbon steel and alloy steel. They possess higher strength and rigidity, enabling them to withstand greater tensile forces and loads. In arc-changing mechanisms such as steel bending equipment, when performing arc-changing operations on heavier arc-changing components 11 or under significant arc-changing forces, chains can stably transmit power without easily breaking or deforming, ensuring the reliability of the arc-changing process.

[0048] More specifically, in this embodiment, the sprocket is a double-row sprocket 21. The double-row sprocket 21 is sleeved on the drive shaft 31, and two chains are respectively wound around the double-row sprocket 21. Through the cooperation of the double-row sprocket 21 with the two chains, it is equivalent to having two sets of transmission structures working simultaneously. This can distribute the load to the two chains. Compared with the connection of the chains through two parallel gears, where each gear and chain bears a relatively large load individually, the double-row sprocket 21 structure can withstand a larger load when transmitting the same power. It is more suitable for use in the arc-changing mechanism of bending steel equipment that requires large load transmission.

[0049] In addition, the combination of double-row sprockets 21 and two chains makes the force distribution during transmission more uniform. During operation, the two chains can coordinate with each other, reducing vibration and shaking caused by uneven force distribution on a single chain, making the operation of the arc-changing mechanism more stable, which helps to improve the accuracy and quality of arc changing and avoids arc-changing deviation caused by transmission instability.

[0050] Furthermore, there are four variable arc guides 20, with each pair of variable arc guides 20 distributed at both ends of the drive shaft 31 and connected to the variable arc member 11 respectively.

[0051] Specifically, in actual operation, the steel bending equipment may be affected by various external factors, such as vibration and impact. Two arc guides 20 alone may not be able to completely counteract the lateral forces generated during the arc bending process, resulting in poor stability of the arc bending component 11. Therefore, in this embodiment, four arc guides 20 are set to provide more uniform support for the arc bending component 11, so that the arc bending component 11 is constrained from multiple points during the arc bending process, making it less prone to shaking or deviation, making the arc bending process more stable, and reducing the arc bending deviation caused by external forces.

[0052] In addition, for some curved steel products with complex shapes and large curvature changes, the four arc guides 20 can be combined in different ways and control strategies to better adapt to various arc requirements, flexibly adjust the guiding force and guiding direction of the arc guide 11, and achieve more complex arc operations.

[0053] Furthermore, the arc-changing component 11 includes a forming roller track and arc-forming components disposed on both sides of the forming roller track. The forming roller track includes several forming rollers, and the arc-forming components include several linkage plates. Two adjacent forming rollers are hinged to a linkage plate. Two arc-changing guides 20 are respectively connected to the linkage plates located at the ends and are used to lift the linkage plates so that the two adjacent forming rollers rotate relative to each other to achieve arc changing.

[0054] Based on this structure, when the arc-changing operation begins, the arc-changing drive is activated, which drives the two arc-changing guides 20 to wind and gradually shorten. At this time, the two arc-changing guides 20 begin to lift the linkage plate located at the end. Simultaneously, since the two adjacent linkage plates are hinged, they rotate relative to each other during the lifting, causing the entire arc-forming part to form a certain arc. The forming roller is connected to the linkage plate, so that the multiple arc-forming rollers of the entire forming roller track can also change with the arc of the arc-forming part.

[0055] It should be noted that the arc-changing component 11 can also be composed of multiple chain-connected arc-changing units, each connected by a hinge shaft to form a movable chain-like structure. During arc changing, the arc-changing guides 20 at both ends are used to lift the components, causing each arc-changing unit to rotate around the hinge shaft, thereby changing the overall arc. The arc-changing unit can be an arc-changing roller.

[0056] Furthermore, this embodiment also includes a mounting bracket 10, which is positioned above the arc-changing component 11 and used to mount the arc-changing drive component.

[0057] During specific assembly, the mounting bracket 10 can span across both ends of the arc-changing component 11, and then the arc-changing drive component is fixed to the center position of the mounting bracket 10 by screws, bolts and other connecting parts, so that the center line 111 of the arc-changing component is tangent to the outer periphery of the drive shaft 31 or the outer periphery of the wheel on the drive shaft 31.

[0058] More specifically, two brackets 12 are provided on the mounting frame 10. During assembly, the two brackets 12 are respectively placed at both ends of the mounting frame 10, and then both ends of the drive shaft 31 are respectively installed on the two brackets 12. The two brackets 12 support both ends of the drive shaft 31, thereby improving the vibration resistance of the entire system. When the drive shaft 31 is subjected to external vibration or impact, the two brackets 12 can share the vibration energy, reduce the vibration amplitude of the drive shaft 31, and reduce the risk of wear and damage to parts caused by vibration.

[0059] The technical means disclosed in this utility model are not limited to those disclosed in the above embodiments, but also include technical solutions composed of any combination of the above technical features. It should be noted that those skilled in the art can make various improvements and modifications without departing from the principle of this utility model, and these improvements and modifications are also considered within the scope of protection of this utility model.

Claims

1. A variable arc device, characterized in that, include: A conveying assembly for conveying a workpiece; An arc-changing mechanism, comprising an arc-changing drive component, an arc-changing component, and two arc-changing guide components, wherein the arc-changing component is connected to the conveying assembly and is used to guide the conveying assembly to change arc; The two arc-changing guides are respectively connected to both ends of the arc-changing component in the arc-changing direction; both arc-changing guides are connected to the arc-changing drive, the arc-changing drive is used to unwind the arc-changing guide, and the arc-changing guide is used to drive the arc-changing component to arc during the unwinding process.

2. The arc-changing device as described in claim 1, characterized in that, The arc-changing drive component includes a drive motor and a drive shaft. The drive motor is used to drive the drive shaft to rotate. One end of each of the two arc-changing guides is connected to the drive shaft, and the other end of each of the two arc-changing guides is connected to both ends of the arc-changing direction of the arc-changing component. The arc-changing guides are used to unwind when the drive shaft rotates.

3. The arc-changing device as described in claim 2, characterized in that, The centerline of the arc-changing component is tangent to the outer periphery of the drive shaft.

4. The arc-changing device as described in claim 2, characterized in that, The variable arc guide includes a chain, which is pivotally connected to the drive shaft via a sprocket. Both chains are wound around the sprocket from the same side and engage with it. The centerline of the variable arc guide is tangent to the outer periphery of the sprocket.

5. The arc-changing device as described in claim 4, characterized in that, The sprocket is a double-row sprocket, which is sleeved on the drive shaft, and the two chains are respectively wound around the double-row sprocket.

6. The arc-changing device according to any one of claims 2-5, characterized in that, The variable arc guide is provided in four pairs, with each pair of variable arc guides distributed at both ends of the drive shaft and connected to the variable arc component respectively.

7. The arc-changing device according to any one of claims 1-5, characterized in that, The arc-changing component includes a forming roller track and arc-forming components disposed on both sides of the forming roller track. The forming roller track includes a plurality of forming rollers, and the arc-forming component includes a plurality of linkage plates. Two adjacent linkage plates are hinged together, and the forming rollers are rotatably connected to the linkage plates. Two arc-changing guides are respectively connected to the linkage plates located at the ends and are used to lift the linkage plates so that the two adjacent forming rollers rotate relative to each other to achieve arc changing.

8. The arc-changing device according to any one of claims 2-5, characterized in that, It also includes a mounting bracket, which is disposed above the arc-changing component and is used to mount the arc-changing drive component.

9. The arc-changing device as described in claim 8, characterized in that, The mounting frame is provided with two brackets, which are respectively located at both ends of the mounting frame and connected to both ends of the drive shaft to support the drive shaft.

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