Automatic feeding device of bending machine

Abstract

The application relates to the technical field of feeding, and particularly discloses a bending machine automatic feeding device which comprises a conveying unit, a receiving unit, a moving unit, a correcting unit and a suction unit. The correcting unit carries out end positioning on one end of a plate material close to a conveying outlet in dynamic running of the plate material, directly takes the reference edge required by bending processing as a correction target, actively eliminates random deviation, ensures that the postures of each group of plate materials are consistent when the plate materials enter a suction process, and provides a high-precision positioning reference for subsequent bending; the suction unit adopts two-stage operation of vertical lifting first and horizontal moving then, vertically lifts the corrected plate material and completely separates the plate material from the surface of the conveying unit, effectively avoids the risk that the corrected posture is damaged again due to friction in traditional dragging or side pushing, guarantees the stable posture of the plate material during the whole plate material transfer, and thus realizes lossless connection from deviation correction to pickup.

Description

Technical Field

[0001] This invention relates to the field of feeding technology, and more specifically, to an automatic feeding device for a bending machine. Background Technology

[0002] In the field of sheet metal bending, existing bending machines continuously transport sheet metal via conveyor belts during the feeding process. The initial posture of the sheet metal placed on the conveyor belt is often inconsistent, and during the transport process, it is easily affected by factors such as vibration and uneven friction of the belt surface, which can easily cause random skew. If this inconsistency in posture and random deviation are not effectively corrected, it will directly lead to inconsistent positioning benchmarks of the sheet metal entering the bending machine station, seriously reducing bending accuracy and even causing scrap. Summary of the Invention

[0003] To overcome the above-mentioned technical problems, the present invention proposes an automatic feeding device for bending machines.

[0004] The objective of this invention can be achieved through the following technical solutions: An automatic feeding device for a bending machine includes: A conveying unit, used to convey sheet metal to be bent; A receiving unit, located on one side of the conveying unit, is used for stacking plates; The transfer unit is located between the conveying unit and the receiving unit, and is used to transfer the plates on the conveying unit to the receiving unit in sequence; The correction unit is located on the side of the transfer unit near the outlet of the conveying unit and is used to correct the deviation of the plates passing through the transfer unit on the conveying unit. The adsorption unit, which is set on the transfer unit, is used to adsorb and lift the plate after it has been corrected on the conveying unit and separate it from the conveying unit.

[0005] As a further aspect of the present invention: the conveying unit includes a frame, a conveyor belt for carrying the plate is movably mounted on the upper surface of the frame, and a conveyor motor for driving the conveyor belt is mounted on the bottom of the frame.

[0006] As a further embodiment of the present invention: the transfer unit includes guide rails symmetrically arranged on both sides of the receiving unit, a slide table is slidably installed on the guide rail, and pulleys are rotatably installed at both ends of one side of the guide rail. A transfer belt fixedly connected to the slide table is sleeved on the pulley, and a tensioning wheel adapted to the transfer belt is also provided on the guide rail.

[0007] As a further embodiment of the present invention: a rotating shaft is rotatably installed between the two guide rails, one end of the rotating shaft is coaxially and fixedly connected to one of the pulleys, and a transfer motor is also fixedly installed on the frame, and a first transmission belt is connected between the output end of the transfer motor and the rotating shaft.

[0008] As a further aspect of the present invention: the adsorption unit includes lifting cylinders symmetrically arranged on both sides of the slide, the output ends of the two lifting cylinders are connected to the same set of lifting frames, and mounting frames are symmetrically arranged on both sides of the bottom of the lifting frames, and several sets of suction cups are installed on the mounting frames.

[0009] As a further aspect of the present invention: the receiving unit includes a frame fixed to one side of the platform, two sets of guide rods are horizontally fixed inside the frame, a receiving platform is slidably sleeved on the guide rods, limit blocks are provided at the four corners of the receiving platform, a transverse motor is installed on the side of the frame away from the platform, the output end of the transverse motor is connected to a transverse lead screw, and the transverse lead screw is threadedly connected to the receiving platform.

[0010] As a further aspect of the present invention: the correction unit includes a reference positioning component fixed on one side slide and a movable positioning component slidably disposed on the side slide.

[0011] As a further aspect of the present invention: the correction unit further includes a correction motor fixed to the side slide and a correction lead screw rotatably mounted on the side slide. A second transmission belt is connected between the output end of the correction motor and the correction lead screw. A threaded sleeve is threaded onto the correction lead screw. A through groove is provided on the slide. The upper end of the movable positioning member slides through the through groove and is fixedly connected to the threaded sleeve.

[0012] As a further aspect of the present invention: the reference positioning component includes a first bracket fixed on the slide table, and a first correction block for limiting the position of the plate is provided at the bottom of the first bracket.

[0013] As a further aspect of the present invention: the movable positioning component includes a second bracket fixed to the threaded sleeve, the bottom of the second bracket is provided with a second correction block for correcting the plate, and the first correction block has a recessed portion for accommodating the second correction block on the side near the second correction block.

[0014] The beneficial effects of this invention are: By actively correcting the end of the sheet material near the outlet of the conveying unit in the correction unit, the correction unit performs end positioning during the dynamic movement of the sheet material. It directly uses the reference edge required for bending as the correction target, eliminating the random skew angle of the sheet material during the conveying process. This ensures that each group of sheets entering the adsorption process has a consistent spatial posture, providing a highly consistent positioning reference for the subsequent bending process. The adsorption unit is placed on the transfer unit, and a two-stage operation process is adopted, which first vertically adsorbs and lifts, and then horizontally transfers. The adsorption unit lifts the straightened board vertically, so that it is completely separated from the surface of the conveying unit. This effectively avoids the risk of damaging the corrected posture again due to friction or mechanical contact force in the traditional dragging or side-pushing feeding method, and ensures the stability of the board's position and posture throughout the transfer process. Attached Figure Description

[0015] The invention will now be further described with reference to the accompanying drawings.

[0016] Figure 1 This is a three-dimensional structural diagram of the present invention; Figure 2 This is a three-dimensional structural schematic diagram from another perspective of the present invention; Figure 3 This is a schematic diagram of the transfer unit in this invention; Figure 4 This is a schematic diagram of the adsorption unit in this invention; Figure 5 This is a schematic diagram of the receiving unit in this invention; Figure 6 This is a schematic diagram of the correction unit in this invention; Figure 7 for Figure 6 Enlarged view of point A in the middle.

[0017] In the picture: 100. Conveying unit; 110. Frame; 120. Conveyor belt; 130. Conveyor motor; 200. Transfer unit; 210. Guide rail; 220. Slide table; 221. Through groove; 230. Pulley; 240. Transfer belt; 250. Tensioner; 260. Transfer motor; 270. Rotating shaft; 280. First transmission belt; 300, Calibration unit; 310, Calibration motor; 320, Calibration lead screw; 330, Second transmission belt; 340, Threaded sleeve; 350, Reference positioning component; 351, First bracket; 352, First calibration block; 353, Recessed portion; 360, Movable positioning component; 361, Second bracket; 362, Second calibration block; 400, Adsorption unit; 410, Lifting cylinder; 420, Lifting frame; 430, Mounting bracket; 440, Suction cup; 500. Receiving unit; 510. Frame; 520. Guide rod; 530. Receiving platform; 540. Limiting block; 550. Transverse motor; 560. Transverse lead screw; 600. Sheet metal. Detailed Implementation

[0018] The subject matter described herein will now be discussed with reference to exemplary embodiments. It should be understood that these embodiments are discussed only to enable those skilled in the art to better understand and implement the subject matter described herein, and changes may be made to the function and arrangement of the elements discussed without departing from the scope of this specification. Various processes or components may be omitted, substituted, or added as needed in the examples. Furthermore, features described in some examples may be combined in other examples.

[0019] Please see Figure 1 and Figure 2 This invention discloses an automatic feeding device for a bending machine, comprising a conveying unit 100, a transfer unit 200, a correction unit 300, an adsorption unit 400, and a receiving unit 500. The conveying unit 100 is used to convey a sheet metal 600 to be bent. The receiving unit 500 is disposed on one side of the conveying unit 100 and is used to stack the sheet metal 600. The transfer unit 200 is disposed between the conveying unit 100 and the receiving unit 500 and is used to transfer the sheet metal 600 on the conveying unit 100 to the receiving unit 500 in sequence. The correction unit 300 is disposed on the transfer unit 200 near the outlet of the conveying unit 100 and is used to correct the deviation of the sheet metal 600 passing through the transfer unit 200 on the conveying unit 100. The adsorption unit 400 is disposed on the transfer unit 200 and is used to adsorb and lift the corrected sheet metal 600 on the conveying unit 100 and detach it from the conveying unit 100.

[0020] Specifically, the conveying unit 100 continuously conveys the sheet material 600 forward. When one group of sheet materials 600 passes the transfer unit 200, the correction unit 300 positions and corrects the end of the sheet material 600 near the outlet of the conveying unit 100, thereby straightening the tilted sheet material 600. Then, the adsorption unit 400 adsorbs and lifts the straightened sheet material 600 from the conveying unit 100. Next, the transfer unit 200 drives the sheet material 600 to move horizontally out along the direction perpendicular to the conveying route of the conveying unit 100 and put it into the receiving unit 500. Finally, the receiving unit 500 transfers the stacked sheet materials 600 to the bending machine station for bending processing.

[0021] It should be noted that by actively correcting the end of the plate 600 near the outlet of the conveying unit 100 through the correction unit 300, the correction unit 300 performs end positioning during the dynamic movement of the plate and directly uses the reference edge required for bending as the correction target, eliminating the random skew angle of the plate during the conveying process, ensuring that each group of plates 600 entering the adsorption process has a consistent spatial posture, and providing a highly consistent positioning reference for the subsequent bending process. The adsorption unit 400 is set on the transfer unit 200, and a two-stage operation process of vertical adsorption and lifting followed by horizontal transfer is adopted. The adsorption unit 400 lifts the straightened plate 600 vertically, so that it is completely separated from the surface of the conveying unit 100. This effectively avoids the risk of damaging the corrected posture again due to friction or mechanical contact force in the traditional dragging or side-pushing feeding method, and ensures the stability of the plate 600's position and posture throughout the transfer process. The conveying unit 100 adopts a continuous conveying mode. The correction unit 300 completes dynamic correction while the plate 600 is in motion without stopping. The stacking action of the transfer unit 200 and the receiving unit 500 can be executed in parallel with the conveying process, effectively eliminating the waiting interval in the traditional feeding method. This allows the plate 600 to seamlessly connect from coarse conveying to precise feeding, improving the material flow rate at the front end of the bending machine. The receiving unit 500 neatly stacks multiple sets of precisely calibrated plates 600. Since each set of plates 600 has been aligned by the calibration unit 300 before being placed in, the alignment of the edges of the stacked plates is extremely high. This not only improves the space utilization of the receiving unit 500, but also allows the subsequent bending machine station to directly use the stacked edges as a secondary positioning reference when picking up the plates, simplifying the bending machine's own material picking and alignment process and reducing equipment complexity and setup time.

[0022] In one embodiment, please refer to Figure 1 and Figure 2 The conveying unit 100 includes a frame 110, on which a conveyor belt 120 for carrying the plate 600 is movably mounted on the upper surface of the frame 110, and a conveyor motor 130 for driving the conveyor belt 120 is mounted on the bottom of the frame 110. Specifically, by driving the conveyor belt 120 to move through the conveyor motor 130, the plates 600 are placed at intervals on the surface of the conveyor belt 120, and the plates 600 are conveyed forward sequentially by the conveyor belt 120.

[0023] Further, please refer to Figure 3 The transfer unit 200 includes guide rails 210 symmetrically arranged on both sides of the receiving unit 500. A slide table 220 is slidably installed on the guide rail 210. Pulleys 230 are rotatably installed at both ends of one side of the guide rail 210. A transfer belt 240 fixedly connected to the slide table 220 is sleeved on the pulley 230. A tensioning wheel 250 adapted to the transfer belt 240 is also provided on the guide rail 210. Specifically, the transfer belt 240 is driven by the pulley 230 to move, thereby pulling the slide table 220 to slide horizontally along the guide rail 210, so that the correction unit 300 and the adsorption unit 400 on the slide table 220 can move laterally relative to the conveyor belt 120; the tensioning wheel 250 not only provides tension for the transfer belt 240, but also lifts the lower belt surface of the transfer belt 240 upward to avoid interference with the plate 600 passing on the lower conveyor belt 120.

[0024] Furthermore, please refer to Figure 3 A rotating shaft 270 is rotatably installed between the two guide rails 210. One end of the rotating shaft 270 is coaxially and fixedly connected to one of the pulleys 230. A transfer motor 260 is also fixedly installed on the frame 110. A first transmission belt 280 is connected between the output end of the transfer motor 260 and the rotating shaft 270. Specifically, under the transmission action of the first transmission belt 280, the transfer motor 260 drives the rotating shaft 270 to rotate continuously, which in turn drives the pulley 230 to rotate synchronously, thereby pulling the transfer belt 240 to operate, so as to realize the lateral movement of the slide table 220 along the guide rail 210.

[0025] It is worth noting that by using the stand 110 to firmly support the conveyor belt 120 and using the conveyor motor 130 to independently drive the conveyor belt 120, combined with the spaced placement strategy of the plate 600, an orderly and rhythmically controllable incoming material flow is constructed. This not only ensures the stability of the conveying process, but also provides a stable material foundation with predictable position and speed matching for the dynamic correction of the subsequent correction unit 300 and the fixed-point pickup of the adsorption unit 400. This effectively avoids secondary posture interference caused by fluctuations in conveying speed or unevenness of the bearing surface. The tensioning pulley 250 actively lifts the lower belt surface of the transfer belt 240 upwards, creating a safe lifting clearance between the transfer belt 240 spanning the conveying path and the belt surface of the lower conveyor belt 120 and the passing plate 600. This eliminates the risk of the transfer belt 240 scraping or colliding with the conveyed plate 600 due to natural sag caused by gravity or loosening and shaking caused by long-term operation. By installing a rotating shaft 270 between the two guide rails 210, and using a transfer motor 260 in conjunction with the first transmission belt 280 to drive the rotating shaft 270 to rotate, thereby driving the pulleys 230 on both sides to rotate in absolute synchronization, the slides 220 on the two guide rails 210 maintain the same speed and displacement for horizontal sliding, ensuring that the correction unit 300 and the adsorption unit 400 straddling the two slides 220 are subjected to balanced force and without skew or torsion throughout the entire transverse transfer process.

[0026] In yet another embodiment, please refer to Figure 4The adsorption unit 400 includes lifting cylinders 410 symmetrically arranged on two side slides 220. The output ends of the two side lifting cylinders 410 are connected to the same set of lifting frames 420. The bottom sides of the lifting frame 420 are symmetrically arranged with mounting frames 430, and several sets of suction cups 440 are installed on the mounting frames 430.

[0027] Specifically, when the slide table 220 moves laterally to directly above the conveyor belt 120, the correction unit 300 corrects and corrects the deviation of the plate 600 below. The lifting cylinder 410 drives the lifting frame 420 to descend until the suction cup 440 on the mounting frame 430 is in contact with the upper surface of the plate 600. The suction cup 440 is activated to perform negative pressure adsorption on the plate 600. Then, the lifting cylinder 410 drives the lifting frame 420 to lift up, thereby adsorbing and lifting the plate 600 from the surface of the conveyor belt 120. Then, the slide table 220 slides laterally along the guide rail 210, so that the corrected plate 600 can be removed from the conveyor belt 120.

[0028] Further, please refer to Figure 5 The receiving unit 500 includes a frame 510 fixed to one side of the platform 110. Two sets of guide rods 520 are horizontally fixed inside the frame 510. A receiving platform 530 is slidably sleeved on the guide rods 520. Limiting blocks 540 are provided at the four corners of the receiving platform 530. A transverse motor 550 is installed on the side of the frame 510 away from the platform 110. A transverse lead screw 560 is connected to the output end of the transverse motor 550. The transverse lead screw 560 is threadedly connected to the receiving platform 530.

[0029] Specifically, during the receiving process, the transverse motor 550 drives the transverse lead screw 560 to rotate, thereby causing the receiving table 530 to slide laterally along the guide rod 520 to one end near the frame 110. The slide table 220 drives the adsorption unit 400 to move the plate 600 laterally to directly above the receiving table 530. Then, the suction cup 440 stops suction, and the plate 600 can automatically fall into the receiving table 530. The limiting blocks 540 at the four corners guide and reposition the plate 600. When a certain number of plates 600 are stacked in the receiving table 530, the transverse motor 550 drives the receiving table 530 to move along the guide rod 520 to one end away from the frame 110, so that the plates 600 can be transferred in batches to the bending machine station.

[0030] It should be noted that the adsorption unit 400 uses lifting cylinders 410 symmetrically arranged on both sides of the slide table 220 to jointly drive the same set of lifting frames 420, forming a rigid parallel drive structure with a large span. This ensures that the strokes of the two ends of the lifting frame 420 are absolutely synchronized and without lag or tilting during the up-and-down reciprocating motion, so that the plate 600 adsorbed and lifted by the suction cup 440 can be strictly separated from the conveyor belt 120 surface in the vertical direction. This effectively avoids the side slip or local warping of the plate that may be caused by unilateral drive, and ensures that the accurate posture established by the correction unit 300 remains intact during the vertical lifting process. By setting several sets of suction cups 440 on the mounting frame 430, a distributed adsorption force field that can cover different specifications of plates 600 is formed. This not only provides sufficient and uniform lifting force for heavy plates, but also effectively disperses adsorption stress for light plates, preventing excessive local vacuum tension from causing the plates to dent or surface scratches. The limiting blocks 540 set at the four corners of the receiving platform 530 in the receiving unit 500 break through the single function of the traditional flat receiving platform which only provides passive support. When the suction cup 440 releases the plate 600, the four sets of limiting blocks 540 form a gradually narrowing guide channel with their inner wall inclined surface or vertical surface, which dynamically guides and forces the plate 600 to slide and correct itself on the four sides as it descends. This can effectively counteract the random drift of the plate 600 caused by airflow disturbance or slight shift of center of gravity at the moment the air path is cut off, and add a secondary precision positioning step to the stacking process.

[0031] In further embodiments, please refer to Figure 6 The correction unit 300 includes a reference positioning component 350 fixed on a side slide 220 and a movable positioning component 360 slidably disposed on the side slide 220. The calibration unit 300 also includes a calibration motor 310 fixed on the side slide 220 and a calibration lead screw 320 rotatably mounted on the side slide 220. A second transmission belt 330 is connected between the output end of the calibration motor 310 and the calibration lead screw 320. A threaded sleeve 340 is threaded onto the calibration lead screw 320. A through groove 221 is provided on the slide 220. The upper end of the movable positioning member 360 slides through the through groove 221 and is fixedly connected to the threaded sleeve 340.

[0032] Specifically, when the plate 600 on the conveyor belt 120 passes through the transfer unit 200, the end of the plate 600 closest to the outlet of the conveyor belt 120 will first contact the reference positioning member 350 fixed on the slide table 220. The reference positioning member 350 will limit one end of the plate 600. Since the conveyor belt 120 continues to apply forward conveying friction to the plate 600 at this time, the side of the plate 600 away from the reference positioning member 350 will continue to follow the conveyor belt 120 forward. The entire plate 600 will tilt at a certain angle. Then, the correction motor 310 drives the correction screw 320 to rotate, which drives the threaded sleeve 340 to move laterally. This drives the movable positioning member 360 to slide laterally along the through groove 221. The movable positioning member 360 pushes the front end of the plate 600 laterally, forcing the end of the plate 600 away from the reference positioning member 350 to gradually straighten. This will straighten the overall posture of the plate 600. Then, the adsorption unit 400 can be used to adsorb and lift the straightened plate 600.

[0033] It should be noted that the friction generated by the continuous forward conveying of the conveyor belt 120 is used as an auxiliary correction force. When one end of the plate 600 is limited by the reference positioning component 350, the driving force of the conveyor belt 120 will naturally cause the other end of the plate 600, which is not limited, to continue to move forward, thereby causing the plate 600 to actively generate a controllable tilting trend. The reference positioning component 350 is used to fix one end of the plate 600 as the absolute coordinate origin, while the movable positioning component 360 performs lateral quantitative pushing on the forward end of the plate 600. Under the dynamic background of the continuous movement of the conveyor belt 120, the two sets of positioning components form a follow-up correction clamping range, so that the plate 600 automatically rotates and straightens around the reference positioning component 350 during the movement, without stopping the conveyor belt 120, and realizes high-precision online correction without stopping the machine. The correction motor 310 drives the correction screw 320 to rotate via the second transmission belt 330, which in turn drives the threaded sleeve 340 and the movable positioning member 360 to slide laterally along the through groove 221. The inherent self-locking characteristics of the screw thread pair and the linear constraint of the through groove 221 work together to ensure that the movable positioning member 360 has no possibility of backing back or swaying when subjected to the counter-thrust force of the plate 600. At the same time, the screw drive can convert the motor rotation angle into a very small linear displacement, enabling the movable positioning member 360 to apply a progressive pushing amount accurate to the micrometer level to the side of the plate 600, effectively avoiding over-pushing that could cause elastic deformation or new skewing of the plate 600.

[0034] Further, please refer to Figure 6 and Figure 7The reference positioning component 350 includes a first bracket 351 fixed on the slide table 220, and a first correction block 352 for limiting the plate 600 is provided at the bottom of the first bracket 351; the movable positioning component 360 includes a second bracket 361 fixed on the threaded sleeve 340, and a second correction block 362 for correcting the plate 600 is provided at the bottom of the second bracket 361; a recess 353 for accommodating the second correction block 362 is provided on the side of the first correction block 352 near the second correction block 362. Specifically, in the initial state, the movable positioning component 360 overlaps with the reference positioning component 350, and the second correction block 362 is just embedded in the recess 353 of the first correction block 352. When one side of the plate 600 contacts the first correction block 352, its opposite side gradually tilts under the traction of the conveyor belt 120. Then, the correction motor 310 drives the second support 361 to move laterally away from the first support 351, so that the second correction block 362 moves out of the recess 353 and pushes and corrects the front end of the plate 600 along the way, causing the plate 600 to gradually straighten its posture, so as to realize the automatic correction of the plate 600.

[0035] It should be noted that, under the condition that the conveyor belt 120 is running continuously, the second correction block 362 always remains in the contracted state of being embedded in the recess 353 before the correction is started, so that the material-facing surface of the correction unit 300 facing the material 600 in the direction of the material's movement is a continuous and smooth plane. This effectively prevents the movable positioning part 360 from becoming an unexpected obstruction to the material 600 during the conveying process due to protruding from the surface of the reference positioning part 350 in the standby state. This ensures that each group of material 600 can pass smoothly through the area of ​​the transfer unit 200 before being corrected, and greatly reduces the risk of jamming, overturning or surface scratches caused by impacting the protruding structure during the conveying of the material 600. When the correction motor 310 drives the second bracket 361 to move laterally away from the first bracket 351, the second correction block 362 gradually extends out from the recess 353 along a straight line. Its pushing surface maintains continuous contact with the side of the plate 600 throughout the entire movement, so that the plate 600 is subjected to uniform force and has a stable speed during the posture correction process, which effectively protects the edge plating or surface finish of the plate 600. It is especially suitable for precision sheet metal with extremely high surface quality requirements. The first correction block 352 and the second correction block 362 overlap in space. Before the correction is started, the first correction block 352 has already limited the end of the plate 600. During the correction process, the second correction block 362 exits from the recess 353 and pushes until the plate 600 is completely straightened, thus avoiding bidirectional clamping conflicts or correction failures caused by disordered movements.

[0036] The specific embodiments of the present invention have been described above. However, the present invention is not limited to the specific embodiments described above. The specific embodiments described above are merely illustrative and not restrictive. Those skilled in the art can make many other forms under the guidance of the present invention, all of which are within the protection scope of the present invention.

Claims

1. An automatic feeding device for a bending machine, characterized in that, include: Conveying unit (100) for conveying sheet metal (600) to be bent. A receiving unit (500) is disposed on one side of the conveying unit (100) for stacking plates (600). A transfer unit (200) is disposed between the conveying unit (100) and the receiving unit (500) for sequentially transferring the plates (600) on the conveying unit (100) to the receiving unit (500). The correction unit (300) is located on the side of the transfer unit (200) near the outlet of the conveying unit (100) and is used to correct the deviation of the plate (600) passing through the transfer unit (200) on the conveying unit (100); An adsorption unit (400) is disposed on a transfer unit (200) for adsorbing and lifting the plate (600) after correction on the conveying unit (100) and separating it from the conveying unit (100).

2. The automatic feeding device for a bending machine according to claim 1, characterized in that, The conveying unit (100) includes a frame (110), on which a conveyor belt (120) for carrying the plate (600) is movably mounted on the upper surface of the frame (110), and a conveyor motor (130) for driving the conveyor belt (120) is mounted on the bottom of the frame (110).

3. The automatic feeding device for a bending machine according to claim 2, characterized in that, The transfer unit (200) includes guide rails (210) symmetrically arranged on both sides of the receiving unit (500). A slide table (220) is slidably installed on the guide rail (210). Pulleys (230) are rotatably installed at both ends of one side of the guide rail (210). A transfer belt (240) fixedly connected to the slide table (220) is sleeved on the pulley (230). A tensioning wheel (250) adapted to the transfer belt (240) is also provided on the guide rail (210).

4. The automatic feeding device for a bending machine according to claim 3, characterized in that, A rotating shaft (270) is rotatably installed between the two guide rails (210). One end of the rotating shaft (270) is coaxially and fixedly connected to one of the pulleys (230). A transfer motor (260) is also fixedly installed on the frame (110). A first transmission belt (280) is connected between the output end of the transfer motor (260) and the rotating shaft (270).

5. The automatic feeding device for a bending machine according to claim 3, characterized in that, The adsorption unit (400) includes lifting cylinders (410) symmetrically arranged on two side slides (220). The output ends of the two side lifting cylinders (410) are connected to the same set of lifting frames (420). The bottom sides of the lifting frame (420) are symmetrically arranged with mounting frames (430), and several sets of suction cups (440) are installed on the mounting frames (430).

6. The automatic feeding device for a bending machine according to claim 2, characterized in that, The receiving unit (500) includes a frame (510) fixed to one side of the platform (110). Two sets of guide rods (520) are horizontally fixed inside the frame (510). A receiving platform (530) is slidably sleeved on the guide rods (520). Limiting blocks (540) are provided at the four corners of the receiving platform (530). A transverse motor (550) is installed on the side of the frame (510) away from the platform (110). A transverse lead screw (560) is connected to the output end of the transverse motor (550). The transverse lead screw (560) is threadedly connected to the receiving platform (530).

7. The automatic feeding device for a bending machine according to claim 3, characterized in that, The correction unit (300) includes a reference positioning component (350) fixed on a side slide (220) and a movable positioning component (360) slidably disposed on the side slide (220).

8. The automatic feeding device for a bending machine according to claim 7, characterized in that, The calibration unit (300) further includes a calibration motor (310) fixed on the side slide (220) and a calibration lead screw (320) rotatably mounted on the side slide (220). A second transmission belt (330) is connected between the output end of the calibration motor (310) and the calibration lead screw (320). A threaded sleeve (340) is threaded onto the calibration lead screw (320). A through groove (221) is provided on the slide (220). The upper end of the movable positioning member (360) slides through the through groove (221) and is fixedly connected to the threaded sleeve (340).

9. An automatic feeding device for a bending machine according to claim 8, characterized in that, The reference positioning component (350) includes a first bracket (351) fixed on the slide (220), and a first correction block (352) is provided at the bottom of the first bracket (351) to limit the plate (600).

10. An automatic feeding device for a bending machine according to claim 9, characterized in that, The movable positioning component (360) includes a second bracket (361) fixed on a threaded sleeve (340). The bottom of the second bracket (361) is provided with a second correction block (362) for correcting the plate (600). The first correction block (352) has a recess (353) on the side near the second correction block (362) for accommodating the second correction block (362).

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