A multi-roller progressive reinforcing steel arc forming machine and a method of using the same

Abstract

The application provides a multi-roller progressive steel bar arc forming machine and a use method thereof, and relates to the technical field of steel bar forming machines.The multi-roller progressive steel bar arc forming machine comprises a rack, a progressive roller structure arranged on the rack, a roller set, a driving motor and an adjusting structure, wherein the roller set comprises a first roller and a second roller, the first roller is fixed on the rack and connected with the output end of the driving motor, the second roller is movably arranged on the rack and connected with the output end of the driving motor through the adjusting structure.The beneficial effects of the application are as follows: the pressure head can be driven to open or close by the electric push rod, the diameter is steplessly adjusted, different diameters of steel bars can be accurately matched, the contact arc of the pressure head and the steel bar is reasonable, the adaptability of the equipment to various specifications of steel bars is greatly improved, and the complicated operation and high cost of frequently replacing molds of traditional equipment due to the fixed pressure head are avoided.

Description

Technical Field

[0001] This invention relates to the field of rebar forming machine technology, and in particular to a multi-roller progressive rebar arc forming machine and its usage method. Background Technology

[0002] In numerous engineering fields such as construction, bridges, and railways, reinforcing steel, as a critical structural material, often needs to be formed into curved shapes according to different design requirements to better meet the structural performance and spatial requirements of components. Currently, there are various types of equipment on the market for forming curved reinforcing steel. Traditional reinforcing steel bending machines are one of the most common types. In addition, there are some specialized forming machines for processing curved reinforcing steel, which utilize roller combinations and specific transmission systems to bend the steel. These machines offer significant improvements in precision control and production efficiency compared to traditional bending machines. They are suitable for medium-scale batch production operations and can also play a role in some complex curved forming tasks, providing indispensable auxiliary support for modern engineering construction.

[0003] However, existing rebar curvature forming equipment has many limitations and shortcomings in practical use. On the one hand, the contact curvature between the pressure head and the rebar in most equipment is related to the diameter of the pressure head, which is usually a roller with a fixed diameter. This results in a relatively fixed contact curvature, making it difficult to flexibly adjust according to different rebar specifications and the precise requirements of the required forming curvature. In actual engineering projects, when dealing with rebars of various diameters and different bending radii, the only solution is often to replace the entire mold or pressure head. This not only increases the equipment's maintenance costs and replacement time but also limits the equipment's applicability and production efficiency to some extent.

[0004] On the other hand, in the traditional process of forming curved steel bars, the auxiliary transmission rollers generally move along a straight line or a fixed simple arc trajectory, which cannot achieve gradual arc displacement. It is difficult to apply uniform force to the steel bars in accordance with the complex arc change law during the forming process, which can easily lead to problems such as inaccurate arc of the formed steel bars and stress concentration on the surface, affecting the final quality and performance of the steel bars. These defects of existing equipment are more prominent, especially in some special engineering structures with high requirements for arc accuracy, making it difficult to meet the growing demand of modern engineering for high-quality and high-precision arc forming. Summary of the Invention

[0005] In view of this, embodiments of the present invention provide a multi-roller progressive rebar curvature forming machine and its usage method, which solves the problems of inflexible adjustment of the bending rebar head in existing rebar curvature forming equipment and the difficulty of progressive processing.

[0006] An embodiment of the present invention provides a multi-roller progressive rebar curvature forming machine, comprising: frame; A progressive roller structure is mounted on the frame. The progressive roller structure includes a roller assembly, a drive motor, and an adjustment structure. The roller assembly consists of a first roller and a second roller. The first roller is fixed to the frame and connected to the output end of the drive motor. The second roller is movably mounted on the frame and connected to the output end of the drive motor through the adjustment structure. The drive motor can simultaneously drive the first roller and the second roller of the roller assembly to rotate. The adjustment structure includes a bearing, a chain structure, a bearing frame, and a drive component. The drive component is movably disposed at the bottom of the frame. Both the first roller and the second roller have a rotating shaft at their center. The chain structure connects the two rotating shafts. The bearing is disposed outside the rotating shaft. The first roller is disposed on the frame via a fixed frame. The bearing frame is disposed between the fixed frame and the bearing. The movable end of the drive component is movably connected to the bearing frame. The drive component drives the bearing frame to swing in an arc around the outer periphery of the fixed frame, thereby changing the position of the first roller relative to the second roller on the frame. A pressure head, comprising an electric push rod, a support plate, multiple vertical supports, multiple connecting rods, and a top rod. The support plate is disposed outside the electric push rod. The multiple vertical supports are movably disposed on the support plate along a circumferential direction. The multiple vertical supports are movably connected to the top rod via the multiple connecting rods. The top rod is connected to the output end of the electric push rod. The multiple connecting rods are inclined to a horizontal plane so that when the top rod extends, it presses the multiple vertical supports open via the multiple connecting rods. A driving device, the movable end of which is connected to the pressure head, pushes the pressure head toward the roller assembly to form steel bars.

[0007] Furthermore, the driving device includes a sliding frame, a mounting bracket, and a threaded rod. The threaded rod is threadedly connected to the sliding frame, the mounting bracket is slidably mounted inside the sliding frame, and the threaded rod is rotatably connected to the mounting bracket. By rotating the threaded rod, the mounting bracket slides within the sliding frame. The inner length of the sliding frame is oriented toward the roller assembly, the mounting bracket is U-shaped, and the pressure head is rotatably disposed between the upper and lower inner walls of the mounting bracket.

[0008] Furthermore, a guide tube is provided at the center of the support plate, the top rod is slidably connected to the guide tube, multiple grooves are provided through the outer wall of the guide tube, and multiple sliders are provided on the outer periphery of the top rod, each slider being slidably connected to one of the grooves.

[0009] Furthermore, the slider is provided with a first connector at its end, the vertical support is provided with a second connector on the side facing the conduit, and the two ends of the connecting rod are rotatably connected to the first connector and the second connector, respectively.

[0010] Furthermore, a fixed plate is provided on the outer shell of the electric push rod, and a plurality of support rods are connected between the fixed plate and the support plate. The length of the plurality of support rods is configured to be the same as the sliding stroke length of the push rod.

[0011] Furthermore, the support plate is provided with a plurality of guide grooves, and each end of the vertical support is provided with a guide block, and each guide block is slidably connected to a guide groove; The multiple guide grooves are all oriented toward the center of the support plate, and each guide block is configured with a T-shaped longitudinal section. The end of the guide block is attached to the outer wall of the support plate so that the vertical support is not easily detached from the support plate.

[0012] Furthermore, an arc-shaped adjustment groove is provided on the surface of the frame, and the rotating shaft connected to the second roller is movably connected to the adjustment groove; The chain structure includes a first sprocket, a second sprocket, and a chain. The first sprocket and the second sprocket are respectively disposed outside the two rotating shafts, and the chain meshes with the first sprocket and the second sprocket.

[0013] Furthermore, the driving component is a hydraulic push rod, and a movable block is connected to the movable end of the hydraulic push rod. A movable groove is opened in the length direction of the bearing frame, and the movable block is movably connected to the movable groove. The driving component pushes the movable block, causing the movable block to slide in the movable groove, so that the bearing frame swings.

[0014] A method for using a multi-roller progressive rebar arc forming machine includes the following steps: S1. Measure the diameter of the steel bars to be processed in batches, adjust the pressure head to the corresponding diameter in advance according to the diameter of the steel bars, and drive the pressure head to approach the roller group to form an arc forming station through the drive device; S2. Start and monitor the speed of the drive motor, feed the steel bar along the arc forming station, and during the bending process, external power is input to the drive device, so that the drive device gradually drives the pressure head to feed and change the bending arc. S3. The drive component is gradually fed according to the speed of the drive motor, so that the second roller swings along the adjustment groove. At the same time, the external force inputs to the drive device, and the pressure position of the arc forming station gradually shifts during the adjustment process, so that the steel bar forms a progressively curved arc.

[0015] Furthermore, in steps S2 and S3, the input method of the driving device is manual input. By manually rotating the handwheel located outside the threaded rod in the driving device, the position of the pressure head is changed relative to the sliding frame.

[0016] The beneficial effects of the technical solution provided by the embodiments of the present invention are as follows: The multi-roller progressive rebar curvature forming machine and its method of use of the present invention allow the pressure head to be driven by an electric push rod to open or close the vertical support, achieving stepless adjustment of the diameter. This enables precise matching of rebars of different diameters, ensuring a reasonable contact curvature between the pressure head and the rebar, greatly improving the equipment's adaptability to various specifications of rebars, and avoiding the cumbersome operation and high cost of frequent mold replacement required by traditional equipment due to the fixed pressure head. At the same time, the second roller in the progressive roller structure, with the synergistic effect of the drive component and the chain structure, can achieve progressive arc displacement along the arc-shaped adjustment groove, making the rebar uniformly stressed during the forming process, gradually forming the required bending curvature, effectively preventing stress concentration, significantly improving the accuracy and quality of rebar forming, and meeting the high precision requirements of modern engineering for rebar curvature.

[0017] In practical applications, the beneficial effects of this invention are equally prominent. Its operation process is simple. First, the position of the pressure head is pre-adjusted according to the diameter of the steel bar to form a forming station. Then, the roller is driven by the drive motor to rotate and transport the steel bar. With the help of the drive device, the pressure head is gradually pushed to feed and change the bending arc. The whole process is easy for workers to master and operate, which can significantly reduce labor intensity and improve production efficiency. In addition, the equipment has a high degree of automation. Through the coordinated control of the drive motor speed and the feed of the drive components, it can accurately adjust the bending arc of the steel bars and achieve progressive forming. This effectively avoids the arc error problem caused by the simple roller movement trajectory of traditional equipment. It is widely applicable to many engineering fields such as construction, bridges, and railways. Whether it is large-scale infrastructure construction or small precast component production, it can stably output high-quality curved steel bars, which has significant economic value and broad market prospects. Attached Figure Description

[0018] Figure 1 This is a three-dimensional view of the overall structure of the multi-roller progressive rebar arc forming machine and its usage method of the present invention; Figure 2 This is a schematic diagram of the adjustment structure of the multi-roller progressive rebar arc forming machine and its usage method of the present invention; Figure 3 This is a perspective view of the pressure head of the multi-roller progressive steel bar arc forming machine and its usage method of the present invention; Figure 4 This is a three-dimensional view of the pressure head structure of the multi-roller progressive steel bar arc forming machine and its usage method of the present invention. Figure 5This is another perspective view of the multi-roller progressive steel bar arc forming machine and its usage method of the present invention.

[0019] In the diagram: 1. Frame; 2. Roller assembly; 21. First roller; 22. Second roller; 3. Drive motor; 4. Sliding frame; 5. Pressure head; 51. Electric push rod; 511. Fixed plate; 512. Support rod; 52. Support plate; 521. Guide groove; 522. Guide block; 53. Vertical support; 54. Guide tube; 541. Slide groove; 55. Top rod; 551. Slider; 552. First connector; 553. Second connector; 56. Connecting rod; 6. Handwheel; 7. Reinforcing rib; 8. Threaded rod; 9. Mounting bracket; 10. Adjustment groove; 11. Fixed bracket; 12. First sprocket; 13. Rotating shaft; 14. Second sprocket; 15. Chain; 16. Bearing; 17. Bearing bracket; 18. Movable groove; 19. Movable block; 20. Drive component. Detailed Implementation

[0020] To make the objectives, technical solutions, and advantages of the present invention clearer, the embodiments of the present invention will be further described below with reference to the accompanying drawings. The following description presents a preferred embodiment of the various possible embodiments of the present invention, intended to provide a basic understanding of the invention, but not intended to identify key or decisive elements of the invention or to limit the scope of protection sought.

[0021] In all examples shown and discussed herein, any specific values ​​should be interpreted as merely exemplary and not as limitations. Therefore, other examples of exemplary embodiments may have different values.

[0022] Techniques, methods, and equipment known to those skilled in the art may not be discussed in detail, but where appropriate, such techniques, methods, and equipment should be considered part of the specification.

[0023] It should be noted that similar labels and letters in the following figures indicate similar items; therefore, once an item is defined in one figure, it does not need to be discussed further in subsequent figures. Also, it should be understood that, for ease of description, the dimensions of the various parts shown in the figures are not drawn to actual scale.

[0024] In the description of this invention, it should be noted that the circuits, electronic components and modules involved in this invention are all prior art, which can be fully implemented by those skilled in the art, and need not be elaborated upon. The content protected by this invention does not involve improvements to the internal structure and method.

[0025] It should be further noted that, unless otherwise explicitly specified and limited, the terms "installation" and "connection" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; 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; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0026] Please refer to Figure 1 An embodiment of the present invention provides a multi-roller progressive rebar curvature forming machine, including a frame 1, a progressive roller structure, a pressure head 5, and a drive device. The progressive roller structure is mounted on the frame 1 and is mainly used for supporting and guiding the rebar.

[0027] Under the action of the driving device, the pressure head 5 cooperates with the progressive roller structure to achieve the arc forming of the steel bar. The diameter of the pressure head 5 can be adjusted according to the specifications of the steel bar to adapt to the processing requirements of steel bars of different diameters, thereby changing the contact arc with the steel bar and improving the forming accuracy and adaptability.

[0028] Meanwhile, the auxiliary transmission roller (i.e., the second roller 22) in the progressive roller structure can be adjusted to undergo arc displacement, thereby enabling the steel bar to gradually form the required arc during the forming process, achieving progressive arc forming and improving the forming quality of the steel bar.

[0029] Please refer to Figure 1 and Figure 5 Specifically, the progressive roller structure includes a roller assembly 2, a drive motor 3, and an adjustment structure. The roller assembly 2 includes a first roller 21 and a second roller 22. The first roller 21 is fixedly mounted on the frame 1 and connected to the output end of the drive motor 3, thereby rotating under the drive of the drive motor 3.

[0030] The second roller 22 is movably mounted on the frame 1 and connected to the output end of the drive motor 3 through an adjustment structure. In this way, the drive motor 3 can simultaneously drive the first roller 21 and the second roller 22 to rotate, providing power for the conveying and initial bending of the steel bars.

[0031] In this embodiment, the function of the adjustment structure is to connect and realize the position adjustment of the second roller 22 relative to the first roller 21, thereby changing the distance between the two rollers to adapt to the processing requirements of steel bars of different specifications.

[0032] Please refer to Figure 5The adjustment structure specifically includes a bearing 16, a chain structure, a bearing bracket 17, and a drive component 20. The drive component 20 is movably mounted at the bottom of the frame 1, providing adjustment power for the entire adjustment structure. A rotating shaft 13 is installed at the axis of both the first roller 21 and the second roller 22. The chain structure connects these two rotating shafts 13 to realize power transmission, so that the drive motor 3 can synchronously drive the first roller 21 and the second roller 22.

[0033] Furthermore, the bearing 16 is installed on the outside of the rotating shaft 13 to provide support and reduce friction. The first roller 21 is fixed to the frame 1 by the fixing frame 11, while the bearing frame 17 is located between the fixing frame 11 and the bearing 16, connecting and supporting the bearing 16. One end of the bearing frame 17 is fixed to the bearing 16, and the other end can rotate around the outer circumference of the fixing frame 11, so that the bearing 16 can swing around the fixing frame 11 as the center of rotation.

[0034] It is worth noting that the movable end of the drive component 20 is movably connected to the bearing bracket 17. When the drive component 20 is working, it can drive the bearing bracket 17 to swing in an arc around the outer periphery of the fixed frame 11, thereby driving the first roller 21 to change its position relative to the second roller 22 on the frame 1, and realizing the adjustment of the distance between the two rollers.

[0035] Specifically, the frame 1 has an arc-shaped adjustment groove 10 on its surface, and the rotating shaft 13 connected to the second roller 22 is movably connected to the adjustment groove 10. In this way, the second roller 22 can undergo arc-shaped displacement along the adjustment groove 10, so that the arc forming station can gradually shift during the steel bar forming process, thereby realizing the progressive bending arc forming of the steel bar.

[0036] In an optional embodiment, the chain structure includes a first sprocket 12, a second sprocket 14, and a chain 15. The first sprocket 12 and the second sprocket 14 are respectively mounted on the outside of the two rotating shafts 13, and the chain 15 meshes with the first sprocket 12 and the second sprocket 14 respectively, thereby ensuring synchronous rotation between the two rotating shafts 13 and ensuring that the first roller 21 and the second roller 22 can coordinately transport the reinforcing bars.

[0037] The driving component 20 is preferably a hydraulic push rod, with a movable block 19 connected to its movable end. A movable groove 18 is provided along the length of the bearing frame 17, and the movable block 19 is movably connected to the movable groove 18. When the hydraulic push rod is working, it pushes the movable block 19 to slide within the movable groove 18, thereby causing the bearing frame 17 to swing and drive the first roller 21 to move, thus realizing the adjustment function of the progressive roller structure.

[0038] Please refer to Figures 3 to 4 In this embodiment, the pressure head 5 is one of the key components for achieving the arc forming of the steel bar, including an electric push rod 51, a support plate 52, multiple vertical supports 53, multiple connecting rods 56, and a top rod 55.

[0039] The support plate 52 is mounted on the outside of the electric push rod 51, serving as the mounting base for the vertical supports 53. Multiple vertical supports 53 are arranged along the circumferential direction to form a cylindrical shape. The multiple vertical supports 53 are movably mounted on the support plate 52 and can slide or swing on the support plate 52 to change the diameter of the pressure head 5.

[0040] One end of the vertical support 53 is externally and movably connected to the top rod 55 via a connecting rod 56. The top rod 55 is connected to the output end of the electric push rod 51. When the electric push rod 51 is working, the top rod 55 extends and retracts. Multiple connecting rods 56 are inclined to the horizontal plane. When the top rod 55 extends, it exerts a squeezing effect on the vertical support 53 through the connecting rods 56, causing the multiple vertical supports 53 to open on the support plate 52. Conversely, when the top rod 55 retracts, the vertical supports 53 close under their own elasticity or gravity, thereby adjusting the diameter of the pressure head 5 to adapt to the processing requirements of steel bars of different diameters, ensuring a reasonable contact arc between the pressure head 5 and the steel bar, and improving forming accuracy.

[0041] To achieve a stable and reliable connection and motion transmission between the push rod 55 and the vertical support 53, a guide tube 54 is provided at the center of the support plate 52, and the push rod 55 is slidably connected to the guide tube 54. Multiple sliding grooves 541 are formed through the outer wall of the guide tube 54, and multiple sliders 551 are correspondingly provided on the outer periphery of the push rod 55. Each slider 551 is slidably connected to a sliding groove 541. This structure not only ensures the stable sliding of the push rod 55 within the guide tube 54, but also provides a stable connection point for the connecting rod 56 through the cooperation of the sliders 551 and the sliding grooves 541, ensuring accurate force transmission.

[0042] It should be noted that each vertical support 53 is L-shaped in the longitudinal direction, and a reinforcing rib 7 is connected between the adjacent sides of its vertical side to improve the load-bearing capacity of each vertical support 53.

[0043] The slider 551 has a first connector 552 at its end, and a second connector 553 is provided on the side of the vertical support 53 facing the guide tube 54. The two ends of the connecting rod 56 are rotatably connected to the first connector 552 and the second connector 553 respectively. This rotatable connection allows the connecting rod 56 to swing flexibly around the connector during the extension and retraction of the push rod 55, thereby more smoothly driving the vertical support 53 to open or close, improving the adjustment flexibility and reliability of the pressure head 5.

[0044] In addition, a fixed plate 511 is provided on the housing of the electric push rod 51, and the fixed plate 511 is connected to the support plate 52 by multiple support rods 512. The length of the multiple support rods 512 is configured to be the same as the sliding stroke length of the push rod 55. This ensures that the support plate 52 remains stable during the extension and retraction of the push rod 55, without excessive tilting or swaying, ensuring smooth movement of the vertical support 53, and thus ensuring the forming accuracy of the pressure head 5.

[0045] To further improve the stability of the vertical supports 53 on the support plate 52, multiple guide grooves 521 are provided on the support plate 52, and a guide block 522 is provided at the end of each vertical support 53. Each guide block 522 is slidably connected to a guide groove 521. The multiple guide grooves 521 are all oriented towards the center of the support plate 52, and the longitudinal cross-section of the guide block 522 is designed to be T-shaped, with its end tightly fitting against the outer wall of the support plate 52.

[0046] This structural design effectively prevents the vertical support 53 from detaching from the support plate 52 during movement, thus improving the overall structural stability of the pressure head 5.

[0047] Please refer to Figure 2 In an optional embodiment, the movable end of the drive device is connected to the pressure head 5, and its main function is to push the pressure head 5 toward the roller assembly 2, so that the pressure head 5 and the progressive roller structure work together to complete the arc forming of the steel bar.

[0048] It should be noted that the drive device includes a sliding frame 4, a mounting bracket 9, and a threaded rod 8. The threaded rod 8 is threadedly connected to the sliding frame 4, the mounting bracket 9 is slidably mounted inside the sliding frame 4, and the threaded rod 8 is rotatably connected to the mounting bracket 9.

[0049] In addition, a handwheel 6 is fixedly connected to one end of the threaded rod 8 outside the mounting bracket 9 as a manual input end, and the handwheel 6 can be manually rotated to drive the threaded rod 8 to rotate.

[0050] By rotating the threaded rod 8, the mounting bracket 9 can slide along its length within the sliding frame 4. The inner cavity of the sliding frame 4 faces the roller assembly 2 along its length. The mounting bracket 9 has a U-shaped structure, and the pressure head 5 is rotatably disposed between the upper and lower inner walls of the mounting bracket 9.

[0051] This design allows the pressure head 5 to move flexibly closer to or further away from the roller assembly 2 under the drive of the drive device, thereby controlling the feed of the reinforcing bar and gradually changing the bending curvature during the reinforcing bar forming process to meet different curvature forming requirements.

[0052] Alternatively, a linear module connection mounting bracket 9 can be selected as the drive device to drive the pressure head 5 to change its position.

[0053] The working principle of the above specific implementation is as follows: First, based on the diameter of the steel bars to be processed in batches, the pressure head 5 is pre-adjusted to the corresponding appropriate diameter. Specifically, the pressure head 5 is driven by the drive device to a position close to the roller assembly 2, forming an arc forming station. At this time, the electric push rod 51 can be activated to extend and retract the top rod 55, which, through the connecting rod 56, drives the vertical support 53 to open or close on the support plate 52 until the diameter of the pressure head 5 matches the diameter of the steel bar to be processed. Next, the drive motor 3 is started and its speed is monitored in real time. Then, the steel bar is slowly fed into the forming station along the already formed arc. During the bending process of the steel bar, external power needs to be input to the drive device. If it is a manual input method, the handwheel 6 located outside the threaded rod 8 in the drive device can be manually rotated to make the threaded rod 8 rotate relative to the sliding frame 4, thereby pushing the mounting frame 9 to slide within the sliding frame 4, which in turn drives the pressure head 5 to feed gradually, gradually changing the bending arc of the steel bar. Simultaneously, based on the rotational speed of the drive motor 3, the drive component 20 (hydraulic push rod) is gradually fed forward. The hydraulic push rod pushes the movable block 19 to slide within the movable groove 18 of the bearing frame 17, causing the bearing frame 17 to swing, which in turn drives the first roller 21 to swing along the adjustment groove 10 on the frame 1. With the external power continuously acting on the drive device, the pressure position of the arc forming station gradually shifts, so that the steel bar forms a progressive bending arc under the combined action of the progressive roller structure and the pressure head 5, completing the precise arc forming process.

[0054] In this document, the directional terms such as front, back, top, and bottom are defined based on the position of the components in the accompanying drawings and their relative positions to each other, solely for the purpose of clarity and convenience in expressing the technical solution. It should be understood that these are relative concepts and can vary depending on different methods of use and placement; the use of these directional terms should not limit the scope of protection claimed in this application.

[0055] Where there is no conflict, the above embodiments and features described herein can be combined with each other.

[0056] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A method for using a multi-roller progressive rebar arc forming machine, characterized in that, A multi-roller progressive rebar curvature forming machine is used, the forming machine comprising: Rack (1); A progressive roller structure is provided on the frame (1). The progressive roller structure includes a roller group (2), a drive motor (3), and an adjustment structure. The roller group (2) consists of a first roller (21) and a second roller (22). The first roller (21) is fixed on the frame (1) and connected to the output end of the drive motor (3). The second roller (22) is movably provided on the frame (1) and connected to the output end of the drive motor (3) through the adjustment structure. The drive motor (3) can simultaneously drive the first roller (21) and the second roller (22) of the roller group (2) to rotate. The adjustment structure includes a bearing (16), a chain structure, a bearing frame (17), and a drive component (20). The drive component (20) is movably disposed at the bottom of the frame (1). The first roller (21) and the second roller (22) are both provided with a rotating shaft (13). The chain structure is connected between the two rotating shafts (13). The bearing (16) is disposed outside the rotating shaft (13). The first roller (21) is disposed on the frame (1) through a fixed frame (11). The bearing frame (17) is disposed between the fixed frame (11) and the bearing (16). The movable end of the drive component (20) is movably connected to the bearing frame (17). The drive component (20) drives the bearing frame (17) to swing in an arc around the outer periphery of the fixed frame (11), so that the first roller (21) changes its position relative to the second roller (22) on the frame (1). The driving component (20) is a hydraulic push rod, and a movable block (19) is connected to the movable end of the hydraulic push rod. The bearing frame (17) has a movable groove (18) in the length direction. The movable block (19) is movably connected to the movable groove (18). The driving component (20) pushes the movable block (19) to make the movable block (19) slide in the movable groove (18) so that the bearing frame (17) swings. The frame (1) has an arc-shaped adjustment groove (10) on its surface, and the rotating shaft (13) connected to the second roller (22) is movably connected to the adjustment groove (10); A pressure head (5) includes an electric push rod (51), a support plate (52), multiple vertical supports (53), multiple connecting rods (56), and a top rod (55). The support plate (52) is disposed outside the electric push rod (51). The multiple vertical supports (53) are movably disposed on the support plate (52) along the circumferential direction. The multiple vertical supports (53) are movably connected to the top rod (55) through the multiple connecting rods (56). The top rod (55) is connected to the output end of the electric push rod (51). The multiple connecting rods (56) are inclined to the horizontal plane so that when the top rod (55) extends, it squeezes the multiple vertical supports (53) open through the multiple connecting rods (56). A driving device, the movable end of which is connected to the pressure head (5), the driving device pushes the pressure head (5) toward the roller group (2) to form steel bars; The method includes the following steps: S1. Measure the diameter of the batch of steel bars to be processed, and adjust the pressure head (5) to the corresponding diameter in advance according to the diameter of the steel bars. Drive the pressure head (5) to approach the roller group (2) through the driving device to form an arc forming station. S2. Start and monitor the speed of the drive motor (3), and feed the steel bar along the arc forming station. During the bending process, external power is input to the drive device, so that the drive device gradually drives the pressure head (5) to feed and change the bending arc. S3. The drive component (20) is gradually fed according to the speed control of the drive motor (3), so that the second roller (22) swings along the adjustment groove (10). At the same time, the external action inputs the drive device, and the pressure position of the arc forming station gradually shifts during the adjustment process, so that the steel bar forms a progressive bending arc.

2. The method of using the multi-roller progressive rebar arc forming machine as described in claim 1, characterized in that, The driving device includes a sliding frame (4), a mounting bracket (9) and a threaded rod (8). The threaded rod (8) is threadedly connected to the sliding frame (4). The mounting bracket (9) is slidably installed in the sliding frame (4), and the threaded rod (8) is rotatably connected to the mounting bracket (9). By rotating the threaded rod (8), the mounting bracket (9) slides in the sliding frame (4). The inner length direction of the sliding frame (4) is oriented toward the roller assembly (2), the mounting bracket (9) is U-shaped, and the pressure head (5) is rotatably disposed between the upper and lower inner walls of the mounting bracket (9).

3. The method of using the multi-roller progressive rebar arc forming machine as described in claim 1, characterized in that, A conduit (54) is provided at the center of the support plate (52). The top rod (55) is slidably connected to the conduit (54). Multiple grooves (541) are provided through the outer wall of the conduit (54). Multiple sliders (551) are provided on the outer periphery of the top rod (55). Each slider (551) is slidably connected to a groove (541).

4. The method of using the multi-roller progressive rebar arc forming machine as described in claim 3, characterized in that, The slider (551) is provided with a first connector (552) at its end, and the vertical support (53) is provided with a second connector (553) on one side facing the conduit (54). The two ends of the connecting rod (56) are rotatably connected to the first connector (552) and the second connector (553) respectively.

5. The method of using the multi-roller progressive rebar arc forming machine as described in claim 1, characterized in that, The electric push rod (51) has a fixed plate (511) on its outer shell. A plurality of support rods (512) are connected between the fixed plate (511) and the support plate (52). The length of the plurality of support rods (512) is configured to be the same as the sliding stroke length of the push rod (55).

6. The method of using the multi-roller progressive rebar arc forming machine as described in claim 1, characterized in that, The support plate (52) is provided with a plurality of guide grooves (521), and each vertical support (53) is provided with a guide block (522) at its end. Each guide block (522) is slidably connected to a guide groove (521). The multiple guide grooves (521) are all oriented toward the center of the support plate (52), and each guide block (522) is configured with a T-shaped longitudinal section. The end of the guide block (522) is attached to the outer wall of the support plate (52) so that the vertical support (53) is not easily detached from the support plate (52).

7. The method of using the multi-roller progressive rebar arc forming machine as described in claim 1, characterized in that, The chain structure includes a first sprocket (12), a second sprocket (14), and a chain (15). The first sprocket (12) and the second sprocket (14) are respectively disposed outside the two shafts (13), and the chain (15) meshes with the first sprocket (12) and the second sprocket (14).

8. The method of using the multi-roller progressive rebar arc forming machine as described in claim 2, characterized in that: In steps S2 and S3, the input method of the drive device is manual input. By manually rotating the handwheel (6) located outside the threaded rod (8) in the drive device, the position of the pressure head (5) is changed relative to the sliding frame (4).

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