Precise arc bending device and method for deformed steel bars

Abstract

The invention relates to an accurate arc bending device and method for deformed steel bars, and relates to the technical field of deformed steel bar machining. The accurate arc bending device comprises a rack, a feeding mechanism, an accurate arc bending mechanism, a control panel and a heating coating device; the precise arc bending mechanism achieves precise control over the arc bending angle of the steel bar through a driving forming roller, a driven forming roller, an angle sensor, an arc surface detection probe and other assemblies, the heating coating device conducts local heating and high-temperature anti-oxidation coating on the steel bar before arc bending through cooperative operation of a heating coil and a spraying cover, oxide skin is prevented from being generated, and the service life of the steel bar is prolonged. And the control system adjusts the extrusion force, the feeding speed and the arc bending angle in real time according to detection data, closed-loop control is achieved, and the device has the effects of being high in arc bending precision, high in automation degree, stable in machining quality and high in adaptability.

Description

Technical Field

[0001] This application relates to the field of rebar processing technology, and in particular to a device and method for precise bending of rebar. Background Technology

[0002] Currently, during the construction of wind turbine foundations, a large number of curved threaded steel bars need to be laid in the tower base foundation to ensure that the foundation has sufficient bearing strength and structural stability, and can effectively cope with the vertical load, horizontal load and torque generated during wind turbine operation. The processing accuracy of the curved threaded steel bars is directly related to the forming quality of the foundation steel bar skeleton, which in turn affects the overall safety of the wind turbine foundation. The industry generally uses traditional steel bar bending machines for processing. Its core working principle is to drive the steel bar feed through active rollers and use the arc contour of the forming rollers to squeeze and bend the steel bar, thereby achieving arc processing.

[0003] However, traditional bending equipment has obvious technical defects in practical applications. On the one hand, due to the lack of a real-time detection and feedback adjustment mechanism for the bending angle, problems such as large deviations in bending angle and substandard arc accuracy are prone to occur during processing, making it difficult to meet the high precision and high consistency construction requirements of wind turbine foundations for curved steel bars. On the other hand, existing equipment mostly performs cold bending during the bending process without effective pretreatment of the steel bars, which can easily lead to cracks on the surface of the steel bars or damage to the internal structure, affecting the mechanical properties and service life of the finished product. In addition, traditional equipment has poor adaptability to steel bars of different diameters and materials, is inconvenient to adjust, has low batch processing efficiency, and is difficult to prevent the formation of oxide scale during high-temperature bending, which further affects the forming quality.

[0004] In summary, existing rebar bending technology has shortcomings in terms of processing accuracy, quality control, and equipment adaptability. There is an urgent need for a precision bending device and method that can achieve high-precision bending, has pre-processing capabilities, and can adapt to the processing of multiple specifications of rebar, in order to improve the forming quality and construction efficiency of the wind turbine foundation rebar skeleton and ensure the safe operation of the wind turbine. Summary of the Invention

[0005] The purpose of this application is to provide a device and method for precise bending of rebar to solve the problems mentioned in the background art.

[0006] On one hand, the present application provides a precision bending device for rebar, which adopts the following technical solution: it includes a frame, a feeding mechanism, a precision bending mechanism, and a control panel. The feeding mechanism is provided on the front side of the frame, and the precision bending mechanism is provided on the right side of the frame. The control panel is installed on the side of the precision bending mechanism. The device is characterized by further including a heating and coating device located on the outside of the frame. The heating and coating device includes a first housing, which is installed on the outside of the frame. A bracket is bolted to the front side of the first housing. A first motor is installed in the middle of the front side of the bracket. A spacing adjustment component is connected to the output end of the first motor. The spacing adjustment component extends into the interior of the first housing, and its two sides are respectively connected to a heating coil and a spray hood. The side of the spray hood is connected to a coating storage box via a pipe. A moving component is installed on the rear side of the first housing, and the moving component is respectively connected to the heating coil and the outside of the spray hood.

[0007] Preferably, the feeding mechanism includes a drive roller, which is symmetrically mounted on the outside of the frame with a driven roller. One side of the drive roller's shaft end is connected to the drive device, and one side of the driven roller's shaft end extends movably into the frame. A spring is installed outside the extended end of the driven roller, and the spring is located outside the telescopic output end of the first cylinder. The lower end of the first cylinder is connected to the extended end of the driven roller.

[0008] By adopting the above technical solution, namely the cooperation between the spring and the first cylinder, the driven roller can automatically adjust the clamping distance according to the diameter of the steel bar, while maintaining a stable feeding pressure, avoiding slippage of the steel bar during the conveying process, and ensuring precise matching between the feeding speed and the bending speed.

[0009] Preferably, the precision bending mechanism includes a bending bracket connected to the side of the frame. Active forming rollers are mounted on both sides of the lower end of the bending bracket, and a driven forming roller is slidably mounted on the middle of the upper end of the bending bracket. Second cylinders are mounted on both sides of the upper end of the bending bracket, with their lower ends connected to the driven forming rollers. A torque sensor is connected to the rear shaft end of the driven forming roller, and a drive motor is connected to the rear shaft end of the active forming roller. The drive motor and the active forming roller are connected via an angle sensor. A connecting plate is fixedly connected to the right side of the bending bracket, and a positioning block is fixed to the outside of the connecting plate. A displacement sensor is mounted on one side of the positioning block, and an arc surface detection probe is mounted on the other side of the positioning block.

[0010] By adopting the above technical solution, namely the multi-detection design of torque sensor, angle sensor and arc surface detection probe, real-time monitoring of extrusion force, bending angle and arc surface profile is realized. Combined with the closed-loop adjustment of the control system, the bending accuracy is significantly improved, ensuring that the curvature of the finished product is highly consistent with the design parameters.

[0011] Preferably, the spacing adjustment component includes a turntable, which is located on the front side of the first housing and connected to the output end of the first motor at its center. Connecting arms are rotatably connected to both the upper and lower ends of the turntable. A frame is connected to the end of the connecting arm away from the turntable. Positioning rods are fixed on both sides of the frame. The positioning rods are slidably inserted into the interior of the first housing. A guide strip is connected to the insertion end of the positioning rod, and a heating coil and a spray cover are slidably installed on both sides of the outer end of the guide strip, respectively.

[0012] By adopting the above technical solution, namely, the first motor drives the turntable to rotate, and the connecting arm drives the frame and guide bar to move, the distance between the heating coil and the spray hood can be adjusted synchronously, so that the two can quickly move closer to or away from the steel bar, adapting to the heating and coating needs of steel bars of different diameters.

[0013] Preferably, the moving component includes a second housing, which is connected to the rear side of the first housing and embedded inside the frame. A second motor is disposed inside the rear side of the second housing. A main gear is connected to the output end of the second motor. A secondary gear meshes with the side of the main gear. A connecting shaft is inserted into the outer side of both the main gear and the secondary gear. A swing arm is connected to the outer side of both connecting shafts. The lower end of the swing arm is rotatably connected to the second housing, and a connecting strip is connected to the upper end of the swing arm. The connecting strip is limited and installed inside the upper end of the second housing, and a limit strip is connected to the side of the connecting strip. The front side of the limit strip is respectively limited and connected to the rear side of the heating coil and the spray cover.

[0014] By adopting the above technical solution, the second motor drives the main gear and the auxiliary gear to mesh and rotate, which in turn drives the swing arm to swing. Then, the heating coil and the spraying hood are driven to move back and forth along the direction of the steel bar feed through the connecting strip and the limiting strip, so as to achieve dynamic heating and uniform coating, and avoid local overheating or uneven coating.

[0015] Preferably, both the active forming roller and the driven forming roller have an arc-shaped groove in the middle, and the inner wall of the arc-shaped groove is provided with anti-slip texture matching the rib pattern of the threaded steel bar.

[0016] By adopting the above technical solution, that is, matching the anti-slip texture of the inner wall of the arc-shaped groove with the rib pattern of the threaded steel bar, the contact area and friction between the roller and the steel bar are increased, preventing the steel bar from sliding relative to the roller during the bending process, making the force more uniform, and improving the bending forming quality.

[0017] Preferably, the guide bar is laterally fixed to the insertion ends of the positioning rods on both sides, and a limiting groove is provided on the outer sides of both the front and rear sides of the guide bar.

[0018] By adopting the above-mentioned technical solution, namely the limiting inner grooves opened on the front and rear sides of the guide bar, a stable sliding guide is provided for the heating coil and the spraying cover, ensuring that the two maintain precise alignment during movement and avoiding deviation.

[0019] Preferably, the swing arms are installed symmetrically along the inside of the second housing, and long grooves are provided in the middle and upper middle of both sides of the swing arms.

[0020] By adopting the above-mentioned technical solution, namely the long grooves opened in the middle and upper part of the swing arm, a stable activity space is provided for the swing arm to swing back and forth with the main gear and the auxiliary gear, as well as the reciprocating movement of the connecting bar, so that the transmission is smoother and the jamming phenomenon during the movement is reduced.

[0021] Preferably, the limiting strip is internally located on the rear side of the first housing, and the front side of the limiting strip is vertically slidably connected to the heating coil and the spray cover, respectively.

[0022] By adopting the above technical solution, the front side of the limiting strip is vertically slidably connected to the heating coil and the spray cover, so that the two remain synchronized and stable during movement, while facilitating disassembly and maintenance.

[0023] On the other hand, this application also provides a method for a precise bending device for rebar, comprising the following steps: S1. Equipment debugging: Adjust the frame to a horizontal position, set the processing parameters through the control panel according to the parameters of the threaded steel bars to be processed, and replace the appropriate forming roller assembly; S2, Rebar Feeding: Insert the threaded rebar to be processed into the feed channel of the feeding mechanism, start the feeding mechanism, and feed the rebar between the forming roller assembly of the precision bending mechanism until the front end of the rebar contacts the positioning stop, at which point the feeding mechanism stops working; S3. Heating and Coating Protection: Start the heating and coating device. The first motor drives the spacing adjustment component to move the heating coil and the spray hood closer to the steel bar, so that the heating coil is close to the outer periphery of the section of the steel bar to be heated, and the spray hood is close to the outer periphery of the section of the steel bar to be sprayed. At the same time, the moving component drives the heating coil and the spray hood to move back and forth along the steel bar feeding direction. The heating coil locally heats the steel bar, and the spray hood sprays a high-temperature anti-oxidation coating before the steel bar is heated. S4. Precision Bending: The precision bending mechanism is activated, and the second cylinder pushes the driven forming roller toward the active forming roller, applying a preset extrusion force; the drive motor drives the active forming roller to rotate, causing the threaded steel bar to bend; at the same time, the angle sensor and the arc surface detection probe detect data in real time and transmit it to the control panel. S5. Angle calibration and closed-loop adjustment: The control panel compares and analyzes the received actual detection data with the design parameters. If there is a deviation, it will automatically issue an adjustment command to fine-tune the feed speed, extrusion force or the rotation angle of the active forming roller until the actual bending angle is consistent with the design angle. S6. Finished product discharge: After the bending process meets the standard, the second cylinder drives the driven forming roller to reset, and the feeding mechanism starts again to transport the completed curved steel bar to the discharge end. S7. Batch processing: Repeat steps S2-S6 to perform batch precision bending processing on multiple threaded steel bars.

[0024] In summary, this application includes at least one of the following beneficial technical effects: 1. This invention, by setting up a precise bending mechanism, achieves real-time monitoring of the bending angle, arc contour, and extrusion force through the coordinated action of an active forming roller, a driven forming roller, an angle sensor, an arc surface detection probe, and a torque sensor. Combined with the closed-loop adjustment function of the control system, it can automatically adjust the feed speed, extrusion force, and rotation angle according to the deviation, ensuring that the bending angle of the threaded steel is highly consistent with the design parameters, significantly improving processing accuracy, and meeting the usage standards of high-requirement scenarios such as wind turbine tower foundations.

[0025] 2. This invention incorporates a heating coating device, which locally heats the reinforcing bar before bending it using a heating coil. This reduces its yield strength, decreases the mechanical stress required for bending, and prevents surface cracks or internal structural damage caused by cold bending. Simultaneously, a high-temperature anti-oxidation coating is applied before heating. The coating melts upon heating to form a dense protective film, effectively isolating air and preventing the formation of high-temperature oxide scale. This significantly improves the surface quality and mechanical properties of the reinforcing bar, and extends its service life.

[0026] 3. By setting up a spacing adjustment component, that is, by driving the turntable, connecting arm, frame and guide bar together through the first motor, the spacing between the heating coil and the spray cover and the steel bar can be adjusted synchronously. This can quickly adapt to the processing requirements of steel bars of different diameters, ensure the precise alignment of heating and coating operations, and improve the equipment's versatility and operating efficiency.

[0027] 4. By setting up a moving component, namely, by using a second motor to drive the main and auxiliary gears, the swing arm, the connecting bar and the limiting bar in a coordinated manner, the heating coil and the spraying cover are driven to move back and forth along the feed direction of the steel bar, so as to realize dynamic scanning heating and coating of the curved section of the steel bar to be bent, avoiding local overheating or uneven coating, ensuring uniform heating and complete coating, and further improving the consistency of steel bar processing and yield. Attached Figure Description

[0028] Figure 1 This is a schematic diagram of the overall structure of this application; Figure 2 This application Figure 1 Enlarged structural diagram at point A in the middle; Figure 3 This application is intended to provide a method for precisely bending rebar. Figure 4 This is a schematic diagram of the overall structure of the heating coating device of this application; Figure 5 This is a schematic diagram of the overall structure of the spacing adjustment component of this application; Figure 6 This is a schematic diagram of the overall structure of the mobile component in this application; Figure 7 This is a schematic diagram of the overall structure of the mobile component part of this application.

[0029] Explanation of reference numerals in the attached drawings: 1. Frame; 2. Feed mechanism; 21. Driving roller; 22. Driven roller; 23. Spring; 24. First cylinder; 3. Precision bending mechanism; 31. Bending support; 32. Driving forming roller; 33. Driven forming roller; 34. Second cylinder; 35. Torque sensor; 36. Angle sensor; 37. Drive motor; 38. Connecting plate; 39. Positioning stop; 310. Displacement sensor; 311. Arc surface detection probe; 4. Control panel; 5. 51. Heating and coating device; 52. First housing; 53. Support; 54. First motor; 55. Spacing adjustment component; 541. Turntable; 542. Connecting arm; 543. Frame; 544. Positioning rod; 545. Guide bar; 55. Heating coil; 56. Spray coating cover; 57. Moving component; 571. Second housing; 572. Second motor; 573. Main gear; 574. Secondary gear; 575. Connecting shaft; 576. Swing arm; 577. Connecting bar; 578. Limiting bar. Detailed Implementation

[0030] The following is in conjunction with the appendix Figure 1 -Appendix Figure 7 This application will be described in further detail below.

[0031] A precision bending device for rebar, referring to Figures 1-2 The machine includes a frame 1, a feeding mechanism 2, a precision bending mechanism 3, and a control panel 4. The feeding mechanism 2 is located on the front side of the frame 1, and the precision bending mechanism 3 is located on the right side of the frame 1. The control panel 4 is installed on the side of the precision bending mechanism 3. The machine is characterized by further including a heating coating device 5 located on the outside of the frame 1. The frame 1 is an integral steel structure, formed by welding of steel profiles, and has adjustable anchor bolts at the bottom for adjusting the levelness of the frame and avoiding bending deviations caused by shaking during processing.

[0032] The feeding mechanism 2 includes an active roller 21, which and a driven roller 22 are symmetrically mounted on the outside of the frame 1. One side of the active roller 21 is connected to the drive device, and a rebar feeding channel is formed between the active roller 21 and the driven roller 22. One side of the driven roller 22 extends into the frame 1, and a spring 23 is installed outside the extended end of the driven roller 22. The spring 23 is located outside the extension and retraction output end of the first cylinder 24, and the lower end of the first cylinder 24 is connected to the extended end of the driven roller 22. The cooperation between the spring 23 and the first cylinder 24 enables the driven roller 22 to automatically adjust the clamping distance according to the diameter of the rebar, while maintaining a stable feeding pressure, preventing the rebar from slipping during the conveying process, and ensuring a precise match between the feeding speed and the bending speed. The drive device connected to the active roller 21 adopts frequency conversion speed regulation, and the adjustable range of the feeding speed is 0.5-3 m / min.

[0033] The precision bending mechanism 3 includes a bending bracket 31, which is fixed to the side of the frame 1. Active forming rollers 32 are mounted on both sides of the lower end, and a driven forming roller 33 is slidably mounted in the middle of the upper end. A second cylinder 34 is located on both sides of the upper end of the bending bracket 31, with its lower end connected to the driven forming roller 33. This cylinder is used to adjust the extrusion pressure, which is adjustable from 0.5 to 5 MPa. A torque sensor 35 is connected to the rear shaft end of the driven forming roller 33 for real-time detection of the extrusion torque. A drive motor 37 is connected to the rear shaft end of the active forming roller 32, and the drive motor 37 is connected to the active forming roller 32 via an angle sensor 3. The six-phase connection includes a connecting plate 38 fixedly connected to the right side of the bending bracket 31, a positioning block 39 fixed to the outside of the connecting plate 38, a displacement sensor 310 installed on one side of the positioning block 39, and an arc surface detection probe 311 installed on the other side of the positioning block 39. This is used to detect the arc surface profile and displacement of the bent steel bar. The multiple detection design of torque sensor 35, angle sensor 36 and arc surface detection probe 311 realizes real-time monitoring of extrusion force, bending angle and arc surface profile. Combined with the closed-loop adjustment of the control system, the bending accuracy is significantly improved, ensuring that the finished arc is highly consistent with the design parameters.

[0034] Both the active forming roller 32 and the passive forming roller 33 have arc-shaped grooves in the middle, and the inner wall of the arc-shaped grooves is provided with anti-slip textures that match the ribs of the threaded steel bars. That is, the anti-slip textures on the inner wall of the arc-shaped grooves match the ribs of the threaded steel bars, which increases the contact area and friction between the rollers and the steel bars, prevents the steel bars from sliding relative to the rollers during the bending process, makes the force more uniform, and improves the bending forming quality.

[0035] A method for a precision bending device for rebar, referring to Figure 3 It includes the following steps: S1. Equipment debugging: Adjust the adjustable anchor bolts at the bottom of the frame 1 to a horizontal state; according to the diameter, material and design bending angle and radius of the threaded steel bar to be processed, set the feed speed, extrusion force, bending angle and other parameters through the control panel 4; replace the appropriate forming roller assembly and adjust the initial distance between the active forming roller 32 and the driven forming roller 33. S2, Rebar feeding: Insert the threaded rebar to be processed into the feed channel of the feeding mechanism 2, start the feeding mechanism 2, and feed the rebar between the forming roller assembly of the precision bending mechanism 3 until the front end of the rebar contacts the positioning stop 39, then the feeding mechanism 2 stops working. S3. Heating and Coating Protection: Start the heating and coating device 5. The first motor 53 drives the spacing adjustment component 54, which moves the heating coil 55 and the spray hood 56 closer to the steel bar, so that the heating coil 55 is close to the outer periphery of the section of the steel bar to be heated, and the spray hood 56 is close to the outer periphery of the section of the steel bar to be sprayed. At the same time, the moving component 57 drives the heating coil 55 and the spray hood 56 to move back and forth along the steel bar feeding direction. The heating coil 55 locally heats the steel bar, and the spray hood 56 sprays a high-temperature anti-oxidation coating before the steel bar is heated. S4. Precision bending: Start the precision bending mechanism 3. The second cylinder 34 pushes the driven forming roller 33 to move closer to the active forming roller 32 and applies a preset extrusion force. The drive motor 37 drives the active forming roller 32 to rotate, which drives the threaded steel bar to bend. At the same time, the angle sensor 36 and the arc surface detection probe 311 detect data in real time and transmit it to the control panel 4. S5. Angle calibration and closed-loop adjustment: The control panel 4 compares and analyzes the received actual detection data with the design parameters. If there is a deviation, it will automatically issue an adjustment command to fine-tune the feed speed, extrusion force or the rotation angle of the active forming roller 32 until the actual bending angle is consistent with the design angle. S6. Finished product discharge: After the bending process is completed, the second cylinder 34 drives the driven forming roller 33 to reset, and the feeding mechanism 2 starts again to transport the completed curved steel bar to the discharge end. S7. Batch processing: Repeat steps S2-S6 to perform batch precision bending processing on multiple threaded steel bars.

[0036] Reference Figure 4The heating coating device 5 includes a first housing 51, which is installed on the outside of the frame 1. A first motor 53 is fixed to the front side by a bracket 52. The first motor 53 is installed in the middle of the front side of the bracket 52. The output end of the first motor 53 is connected to a spacing adjustment component 54. The spacing adjustment component 54 extends into the inside of the first housing 51. The two sides of the spacing adjustment component 54 are respectively connected to the heating coil 55 and the spraying cover 56. The side of the spraying cover 56 is connected to the coating storage box through a pipe. The coating sprayed by the spraying cover 56 is a glass powder-based coating, which is used to melt at high temperature to form a dense protective film to isolate air. A moving component 57 is installed on the rear side of the first housing 51. The moving component 57 is connected to the heating coil 55 and the outside of the spraying cover 56.

[0037] Reference Figure 5 The spacing adjustment component 54 includes a turntable 541, which is located on the front side of the first housing 51. The middle part of the turntable 541 is connected to the output end of the first motor 53. Connecting arms 542 are rotatably connected to the upper and lower ends of the turntable 541. The end of the connecting arm 542 away from the turntable 541 is connected to a frame 543. Positioning rods 544 are fixed on both sides of the frame 543. The positioning rods 544 are slidably inserted into the interior of the first housing 51. The insertion end of the positioning rod 544 is connected to a guide bar 545. Heating coils 55 and spray covers 56 are slidably installed on both sides of the outer end of the guide bar 545, respectively. That is, the first motor 53 drives the turntable 541 to rotate, and the connecting arm 542 drives the frame 543 and the guide bar 545 to move, so as to realize the synchronous adjustment of the spacing between the heating coil 55 and the spray cover 56, so that the two can quickly approach or move away from the steel bar, adapting to the heating and coating needs of steel bars of different diameters.

[0038] The guide bar 545 is horizontally fixed to the insertion end of the positioning rods 544 on both sides, and the guide bar 545 has a limiting groove on the front and rear sides. The limiting groove on the front and rear sides of the guide bar 545 provides a stable sliding guide for the heating coil 55 and the spray cover 56, ensuring that the two maintain accurate alignment during movement and avoid deviation.

[0039] Reference Figures 6-7The moving component 57 includes a second housing 571, which is connected to the rear side of the first housing 51 and embedded inside the frame 1. A second motor 572 is disposed inside the rear side of the second housing 571. A main gear 573 is connected to the output end of the second motor 572. A secondary gear 574 meshes with the side of the main gear 573. A connecting shaft 575 is inserted into the outer side of both the main gear 573 and the secondary gear 574. A swing arm 576 is connected to the outer side of both connecting shafts 575. The lower end of the swing arm 576 is rotatably connected to the second housing 571, and the upper end of the swing arm 576 is connected to a connecting shaft 576. The connecting strip 577 is installed inside the upper end of the second housing 571, and the side of the connecting strip 577 is connected to the limiting strip 578. The front side of the limiting strip 578 is respectively connected to the heating coil 55 and the rear side of the spray cover 56. That is, the second motor 572 drives the main gear 573 and the auxiliary gear 574 to mesh and rotate, which drives the swing arm 576 to swing. Then, through the connecting strip 577 and the limiting strip 578, the heating coil 55 and the spray cover 56 are driven to move back and forth along the direction of the steel bar feeding, so as to realize dynamic heating and uniform coating, and avoid local overheating or uneven coating.

[0040] Among them, the swing arm 576 is installed symmetrically on the left and right sides inside the second housing 571, and the middle and upper middle parts of both sides of the swing arm 576 are provided with long grooves. The long grooves in the middle and upper parts of the swing arm 576 provide a stable activity space for the swing arm 576 to swing back and forth with the main gear 573 and the auxiliary gear 574 and the reciprocating movement of the connecting bar 577, so as to make the transmission smoother and reduce the jamming phenomenon during the movement.

[0041] The limiting strip 578 is internally located inside the rear side of the first housing 51, and the front side of the limiting strip 578 is vertically slidably connected to the heating coil 55 and the spray cover 56 respectively. This allows the two to remain synchronized and stable during movement, while also facilitating disassembly and maintenance.

[0042] The implementation principle of the heating coating device in this embodiment is as follows: First, in the initial state, the heating coil 55 and the spray hood 56 are in a standby position away from the steel bar. When the threaded steel bar to be processed is fed into the precision bending mechanism 3 through the feeding mechanism 2, the control panel 4 issues a start command and the heating coating device 5 starts to work. At this time, the first motor 53 receives a signal to prepare for the subsequent vertical approaching action. When the first motor 53 starts, its output drives the turntable 541 in the spacing adjustment component 54 to rotate. The turntable 541 drives the frame 543 to move through the connecting arms 542 that are rotatably connected at the upper and lower ends. This pushes the positioning rod 544 to slide inward along the outside of the first box 51. The guide bar 545 fixed at the insertion end of the positioning rod 544 moves accordingly, causing the heating coil 55 and the spraying cover 56 to move closer to the steel bar from the upper and lower sides. In this way, the heating coil 55 is precisely close to the outer periphery of the section of the steel bar to be heated, and the spraying cover 56 is close to the outer periphery of the section of the steel bar to be sprayed, thus establishing a suitable working distance for heating and spraying operations. After the heating coil 55 and the spray hood 56 are brought into position, the moving component 57 starts to work. The second motor 572 drives the main gear 573 to rotate, and drives the secondary gear 574 to rotate synchronously through meshing transmission. The connecting shaft 575, which is inserted on the outside of the main gear 573 and the secondary gear 574, rotates accordingly, and drives the swing arm 576 connected at the outer end to swing back and forth in the second housing 571. The upper end of the swing arm 576 drives the limiting strip 578 to move laterally back and forth along the rear side of the first housing 51 through the connecting strip 577. Since the front side of the limiting strip 578 is vertically slidably connected to the rear side of the heating coil 55 and the spray hood 56, this swinging action is finally transformed into the reciprocating movement of the heating coil 55 and the spray hood 56 along the direction of steel bar feeding, realizing the dynamic scanning processing of the steel bar to be bent arc section. During the reciprocating movement of the heating coil 55 and the spray hood 56 driven by the moving component 57, the two work together to perform protective operations. Before the heating coil 55 locally heats the steel bar, the spray hood 56 first sprays a high-temperature anti-oxidation coating onto the surface of the steel bar. The side of the spray hood 56 is connected to an external coating storage tank through a pipe to ensure a continuous supply of coating. The heating coil 55 then heats the sprayed area, causing the coating to melt at high temperature to form a dense protective film, effectively isolating the air and preventing the steel bar from generating oxide scale during high-temperature bending. In summary, by adjusting the combined action of approaching and axial movement, the heating and coating processes are integrated online. Specifically, the spray hood applies a high-temperature anti-oxidation coating before the rebar is heated. This coating melts during the subsequent heating process, forming a dense liquid protective film on the rebar surface. This effectively prevents direct contact between air and the high-temperature rebar, fundamentally solving the problem of surface oxide scale that easily forms on rebar during high-temperature bending. Meanwhile, the localized and precise heating of the heating coil not only provides the necessary heat energy for the melting and film formation of the coating, ensuring a tight adhesion of the protective film, but more importantly, it significantly reduces the mechanical stress required for subsequent bending by lowering the yield strength of the steel. This avoids surface cracks or internal structural damage to the rebar that may occur during cold bending, ensuring both bending accuracy and the mechanical properties and surface quality of the finished rebar.

Claims

1. A precision bending device for rebar, comprising a frame (1), a feeding mechanism (2), a precision bending mechanism (3), and a control panel (4), wherein the feeding mechanism (2) is provided on the front side of the frame (1), the precision bending mechanism (3) is provided on the right side of the frame (1), and the control panel (4) is installed on the side of the precision bending mechanism (3), characterized in that, It also includes a heating coating device (5) located outside the frame (1). The heating coating device (5) includes a first housing (51). The first housing (51) is installed outside the frame (1). A bracket (52) is bolted to the front side of the first housing (51). A first motor (53) is installed in the middle of the front side of the bracket (52). A spacing adjustment component (54) is connected to the output end of the first motor (53). The spacing adjustment component (54) extends into the interior of the first housing (51). The two sides of the spacing adjustment component (54) are connected to the heating coil (55) and the spray hood (56) respectively. The side of the spray hood (56) is connected to the coating storage box through a pipe. A moving component (57) is installed on the rear side of the first housing (51). The moving component (57) is connected to the outside of the heating coil (55) and the spray hood (56) respectively.

2. The precision bending device for rebar according to claim 1, characterized in that, The feeding mechanism (2) includes a drive roller (21), which is symmetrically installed on the outside of the frame (1) with the driven roller (22). The shaft end of the drive roller (21) is connected to the drive device, and the shaft end of the driven roller (22) extends into the frame (1). A spring (23) is installed outside the extension end of the driven roller (22). The spring (23) is located outside the extension output end of the first cylinder (24), and the lower end of the first cylinder (24) is connected to the extension end of the driven roller (22).

3. The precision bending device for rebar according to claim 1, characterized in that, The precision bending mechanism (3) includes a bending bracket (31), which is connected to the side of the frame (1). Active forming rollers (32) are installed on both sides of the lower end of the bending bracket (31), and a driven forming roller (33) is slidably installed in the middle of the upper end of the bending bracket (31). Second cylinders (34) are installed on both sides of the upper end of the bending bracket (31), and the lower ends of both second cylinders (34) are connected to the driven forming rollers (33). A torque torque is connected to the rear shaft end of the driven forming rollers (33). The sensor (35) is connected to the rear shaft end of the active forming roller (32) by a drive motor (37), and the drive motor (37) and the active forming roller (32) are connected by an angle sensor (36). The right side of the curved bracket (31) is fixedly connected to a connecting plate (38), and a positioning block (39) is fixed on the outside of the connecting plate (38). A displacement sensor (310) is installed on one side of the positioning block (39), and an arc surface detection probe (311) is installed on the other side of the positioning block (39).

4. The precision bending device for rebar according to claim 1, characterized in that, The spacing adjustment component (54) includes a turntable (541), which is located on the front side of the first housing (51) and the middle part of the turntable (541) is connected to the output end of the first motor (53). The upper and lower ends of the turntable (541) are rotatably connected to connecting arms (542). The end of the connecting arm (542) away from the turntable (541) is connected to a frame (543). Positioning rods (544) are fixed on both sides of the frame (543). The positioning rods (544) are slidably inserted into the interior of the first housing (51). The insertion end of the positioning rod (544) is connected to a guide strip (545). Heating coils (55) and spray covers (56) are slidably installed on both sides of the outer end of the guide strip (545).

5. The precision bending device for rebar according to claim 1, characterized in that, The moving component (57) includes a second housing (571), which is connected to the rear side of the first housing (51) and embedded inside the frame (1). A second motor (572) is provided inside the rear side of the second housing (571). A main gear (573) is connected to the output end of the second motor (572). A secondary gear (574) meshes with the side of the main gear (573). Connecting shafts (575) are inserted into the outer sides of both the main gear (573) and the secondary gear (574). Both sides of the connecting shaft (575) are connected to the outside of the swing arm (576). The lower end of the swing arm (576) is rotatably connected to the second box (571), and the upper end of the swing arm (576) is connected to the connecting strip (577). The connecting strip (577) is limited and installed inside the upper end of the second box (571), and the side of the connecting strip (577) is connected to the limiting strip (578). The front side of the limiting strip (578) is respectively limited and connected to the rear side of the heating coil (55) and the spray cover (56).

6. The precision bending device for rebar according to claim 3, characterized in that, Both the active forming roller (32) and the passive forming roller (33) have arc-shaped grooves in the middle, and the inner wall of the arc-shaped grooves is provided with anti-slip patterns that match the rib patterns of the threaded steel bars.

7. The precision bending device for rebar according to claim 4, characterized in that, The guide bar (545) is horizontally fixed to the insertion end of the positioning rod (544) on both sides, and the guide bar (545) has a limiting groove on the front and rear sides.

8. The precision bending device for rebar according to claim 5, characterized in that, The swing arms (576) are installed symmetrically on the left and right sides inside the second housing (571), and long grooves are provided in the middle and upper middle of both sides of the swing arms (576).

9. A precision bending device for rebar according to claim 5, characterized in that, The limiting strip (578) is internally located inside the rear side of the first housing (51), and the front side of the limiting strip (578) is vertically slidably connected to the heating coil (55) and the spray cover (56).

10. A method for a precision bending device for rebar, comprising the precision bending device for rebar according to any one of claims 1-9, characterized in that, Includes the following steps: S1. Equipment debugging: Adjust the frame (1) to a horizontal state, set the processing parameters through the control panel (4) according to the parameters of the threaded steel bar to be processed, and replace the appropriate forming roller assembly; S2, Rebar feeding: Insert the threaded rebar to be processed into the feeding channel of the feeding mechanism (2), start the feeding mechanism (2), and feed the rebar to the forming roller assembly of the precision bending mechanism (3) until the front end of the rebar contacts the positioning stop (39), then the feeding mechanism (2) stops working. S3. Heating and Coating Protection: Start the heating and coating device (5), the first motor (53) drives the spacing adjustment component (54), which drives the heating coil (55) and the spray hood (56) to move closer to the steel bar, so that the heating coil (55) is close to the outer periphery of the section of the steel bar to be heated, and the spray hood (56) is close to the outer periphery of the section of the steel bar to be sprayed; at the same time, the moving component (57) drives the heating coil (55) and the spray hood (56) to move back and forth along the steel bar feeding direction, the heating coil (55) locally heats the steel bar, and the spray hood (56) sprays high temperature anti-oxidation coating before the steel bar is heated; S4, Precision bending: Start the precision bending mechanism (3), the second cylinder (34) pushes the driven forming roller (33) to move closer to the active forming roller (32) and applies a preset extrusion force; the drive motor (37) drives the active forming roller (32) to rotate, and drives the threaded steel bar to bend; at the same time, the angle sensor (36) and the arc surface detection probe (311) detect data in real time and transmit it to the control panel (4); S5, Angle calibration and closed-loop adjustment: The control panel (4) compares and analyzes the received actual detection data with the design parameters. If there is a deviation, it will automatically issue an adjustment command to finely adjust the feed speed, extrusion force or the rotation angle of the active forming roller (32) until the actual bending angle is consistent with the design angle. S6. Finished product discharge: After the bending process meets the standard, the second cylinder (34) drives the driven forming roller (33) to reset, and the feeding mechanism (2) starts again to transport the completed curved steel bar to the discharge end. S7. Batch processing: Repeat steps S2-S6 to perform batch precision bending processing on multiple threaded steel bars.

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