Automatic edge folding device for automobile sheet metal part

Abstract

The invention discloses an automatic edge folding device for automobile sheet metal parts, and relates to the technical field of sheet metal machining, the automatic edge folding device comprises an equipment shell and arc-shaped grooves, the arc-shaped grooves are formed in the surfaces of one side and the other side of the inner wall of the equipment shell, a meshing groove is formed in the surface of one side of the equipment shell, and a positioning bearing is fixedly mounted on the surface of one side of the equipment shell; the triangular limiting plate and the rolling wheel are integrated in the wrapping space of the equipment shell, the arc-shaped groove is used for being matched with the revolution track of the connecting shaft, the effect of in-situ indexing switching is achieved on the premise that the mechanical arm is not separated from the working space, the movement stroke of the mechanical arm is greatly shortened, and the working efficiency is improved. The production takt and path continuity in a compact environment are improved, so that the defects that in the prior art, in the switching process, a robot needs to execute the axial lifting action firstly to enable an edge folding head to be completely separated from an operation space and then can rotate in an indexing mode, so that due to frequent rising, rotating and descending, the motion stroke is greatly increased, and the production takt is long are overcome; and a compact machining environment cannot be adapted.

Description

Technical Field

[0001] This invention relates to the field of sheet metal processing technology, and in particular to an automatic bending device for automotive sheet metal parts. Background Technology

[0002] In the automobile manufacturing process, the folding of sheet metal parts is a crucial process. The folding process is usually used to connect the inner and outer panels of covering parts such as doors, hoods, and trunk lids. By folding the edge of the outer panel to cover the inner panel, a high-strength mechanical connection and good appearance sealing are achieved. Currently, automatic folding devices for automotive sheet metal mainly rely on industrial robots equipped with execution heads to complete the process.

[0003] Existing automotive sheet metal automatic bending devices typically consist of an industrial robot end effector equipped with a square bending head. Power is transmitted from a single motor to the main shaft via a reducer. During operation, the robotic arm moves the bending head along the edge, using side-mounted fixed rollers to extrude and shape the sheet metal. However, in existing technologies, the square bending head has a large rotation radius and exposed structure. When changing rollers, the robot must first perform a significant axial lifting motion to completely remove the bending head from the workspace before it can rotate. This frequent rising, rotating, and falling motion significantly increases the travel distance and results in a long production cycle, making it unsuitable for compact processing environments. Secondly, the transmission force balance and rigid locking capabilities are insufficient. Existing single-sided cantilever drive architectures are prone to spindle imbalance and wobbling under the reaction force of high-intensity rolling. Furthermore, locking relies heavily on motor electronic self-locking or friction braking, lacking physical rigid limits. When dealing with thick plates, this easily leads to slight displacement or slippage, resulting in uneven bending pressure, difficulty in ensuring process consistency, and accelerated mechanical wear. To address the aforementioned technical shortcomings, a solution is proposed. Summary of the Invention

[0004] The purpose of this invention is to achieve in-situ indexing switching without leaving the workspace by integrating the triangular limiting plate and the rolling roller within the equipment housing and using the arc groove to adapt to the orbital trajectory of the connecting shaft. This significantly shortens the robotic arm's stroke, improves the production cycle and path continuity in compact environments, and overcomes the shortcomings of existing technologies. In the existing technology, due to the large rotation radius and exposed structure of the square folding head, the robot must first perform a large axial lifting motion to completely remove the folding head from the workspace before it can index and rotate. This frequent rising, rotating and falling motion significantly increases the stroke and results in a long production cycle, making it unsuitable for compact processing environments.

[0005] To achieve the above objectives, the present invention adopts the following technical solution: an automatic folding device for automotive sheet metal parts, comprising a device housing and an arc-shaped groove, wherein the arc-shaped groove is formed on one side and the other side surface of the inner wall of the device housing, a meshing groove is provided on one side surface of the device housing, a positioning bearing is fixedly installed on one side surface of the device housing, a main shaft is fixedly installed on the inner wall of the positioning bearing, a first helical gear is fixedly installed on the outer side surface of the main shaft, a spur gear is fixedly installed on the outer side surface of the first helical gear, a limit ring is provided on one side surface of the spur gear, a drive mechanism is installed on one side surface of the device housing, and a rotating component is installed on the inner wall of the limit ring; The rotating assembly includes a rotating ring, which is slidably mounted on the inner wall of a limiting ring. A limiting plate is fixedly mounted on one side surface of the rotating ring. A rotating bearing is fixedly mounted on the inner wall of the limiting plate. A connecting shaft is fixedly mounted on the inner wall of the rotating bearing. A driven gear is fixedly mounted on the outer surface of the connecting shaft. A rolling roller is fixedly mounted on the outer surface of the connecting shaft. A positioning hole is provided at the end of the connecting shaft.

[0006] Furthermore, there are two arc-shaped grooves, which are respectively distributed on one side and the other side of the inner wall of the equipment housing. There are two positioning bearings, which are respectively distributed on one side and the other side of the equipment housing. The main shaft is fixedly connected to the inner wall of the two positioning bearings. The main shaft is rotatably connected to the equipment housing through the positioning bearings. There are two first helical gears, which are equally distributed on the outer surface of the main shaft. Each outer surface of the first helical gear is correspondingly distributed with a spur gear. Each side surface of the spur gear is correspondingly distributed with a limit ring.

[0007] Furthermore, there are two limiting plates, which are respectively distributed on one side surface of the two spur gears. Rotating rings are correspondingly distributed on one side surface of each of the two limiting plates. The two limiting plates are rotatably connected to the limiting rings installed on one side surface of the two spur gears through the rotating rings. There are six rotating bearings, which are distributed in groups of three on one side surface of the two limiting plates.

[0008] Furthermore, there are three connecting shafts, each of which is fixedly connected to the inner wall of two rotary bearings. The connecting shafts are rotatably connected to the limiting plate through the rotary bearings. Rolling rollers are distributed on the outer surface of each connecting shaft. There are six driven gears, which are distributed in pairs on the outer surface of the three connecting shafts. The driven gears mesh with the spur gears. A positioning hole is provided at the end of each connecting shaft.

[0009] Furthermore, the drive mechanism includes a switching component and a drive component. The switching component includes a limiting hole, which is disposed on one side and the other side surface of the device housing. An electric telescopic rod is fixedly installed on one side surface of the device housing, and a limiting post is installed on the extended end of the electric telescopic rod.

[0010] Furthermore, there are two electric telescopic rods, which are respectively distributed on one side and the other side of the equipment housing. Each electric telescopic rod has a corresponding limit post at its output end. The outer surface of the limit post is slidably connected to the inner wall of the limit hole, and one end of the limit post is rotatably inserted into the inner wall of the positioning hole.

[0011] Furthermore, the drive assembly includes a connecting arm, which is fixedly mounted on the top surface of the device housing. A transmission bearing is mounted on one side surface of the connecting arm, and a drive shaft is fixedly mounted on the inner wall of the transmission bearing. A second helical gear is mounted on the bottom surface of the drive shaft. A protective plate is mounted on one side surface of the device housing. A reduction gear meshes with the outer surface of the drive shaft, and a drive motor is fixedly mounted on the top surface of the connecting arm.

[0012] Furthermore, there are two transmission bearings, which are respectively distributed on one side and the other side of the connecting arm. A drive shaft is fixedly installed on the inner wall of each transmission bearing. The drive shaft is rotatably connected to the connecting arm through the transmission bearing. A second helical gear is distributed at the bottom end of each drive shaft. The two second helical gears mesh with the two first helical gears respectively. A reduction gear is distributed on the outer surface of each of the two drive shafts. The two reduction gears mesh with each other. The output end of the drive motor is fixedly connected to the top end of one of its reduction gears.

[0013] In summary, due to the adoption of the above technical solution, the beneficial effects of the present invention are: 1. This automatic folding device for automotive sheet metal parts integrates a triangular limiting plate and a rolling roller within the equipment housing. By utilizing an arc-shaped groove to adapt to the rotation trajectory of the connecting shaft, it achieves in-situ indexing switching without leaving the workspace. This significantly shortens the robotic arm's travel distance and improves production cycle time and path continuity in compact environments. It overcomes the shortcomings of existing technologies, which, due to the large rotation radius and exposed structure of the square folding head, require the robot to perform a large axial lifting motion to completely remove the folding head from the workspace before indexing and rotating during roller replacement. This frequent rising, rotating, and falling motion significantly increases the travel distance and results in a lengthy production cycle time, making it unsuitable for compact processing environments.

[0014] 2. This automatic folding device for automotive sheet metal parts uses an electric telescopic rod to drive the limit column axially to connect the positioning hole of the shaft. With the help of a dual-drive shaft synchronous reverse transmission structure, it achieves the effect of mechanical rigid locking and main shaft force balance. This eliminates the displacement and slippage of teeth and main shaft wobble under high-intensity rolling, significantly enhances process rigidity, and ensures folding accuracy and equipment life. This overcomes the shortcomings of existing single-sided cantilever drive architecture, which is prone to main shaft force imbalance and wobble under the reaction force of high-intensity rolling. Moreover, its locking mostly relies on motor electronic self-locking or friction braking, lacking physical rigid limiting. When dealing with thick plates, it is very easy for small displacements or slippage to occur, resulting in uneven folding pressure, difficulty in ensuring process consistency, and accelerated mechanical wear. Attached Figure Description

[0015] Figure 1 A schematic diagram of the overall external structure of the present invention is shown; Figure 2 This invention is shown as a schematic diagram of its overall external structure from another angle. Figure 3 A schematic diagram of the internal structure of the connecting arm of the present invention is shown; Figure 4 A schematic diagram of the internal structure of the protective plate of the present invention is shown; Figure 5 A schematic diagram of the overall internal structure of the present invention is shown; Figure 6 A schematic diagram of the overall internal side structure of the present invention is shown; Figure 7 A schematic diagram of the limiting plate structure of the present invention is shown; Figure 8 A schematic diagram of the internal structure of the limiting plate of the present invention is shown; Figure 9 A schematic diagram of the internal structure of the limiting plate of the present invention from another angle is shown; Figure 10 The exterior of the rolling wheel of the present invention is shown.

[0016] Legend: 1. Equipment casing; 101. Arc groove; 102. Meshing groove; 103. Positioning bearing; 104. Main shaft; 105. First helical gear; 106. Spur gear; 107. Limiting ring; 2. Rotating ring; 201. Limiting plate; 202. Rotating bearing; 203. Connecting shaft; 204. Driven gear; 205. Rolling roller; 206. Positioning hole; 3. Limiting hole; 301. Electric telescopic rod; 302. Limiting post; 4. Connecting arm; 401. Transmission bearing; 402. Drive shaft; 403. Second helical gear; 404. Protective plate; 405. Reduction gear; 406. Drive motor. Detailed Implementation

[0017] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0018] It should be noted that, in the description of this invention, the terms "center," "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0019] like Figures 1-10 As shown, an automatic bending device for automotive sheet metal parts includes a housing 1, two arc-shaped grooves 101 are symmetrically opened on both sides of the inner wall of the housing 1, and a meshing groove 102 is provided on one side of the housing 1. Positioning bearings 103 are fixedly installed on both sides of the equipment housing 1. The two ends of the transversely arranged main shaft 104 are fixedly connected to the inner walls of the two positioning bearings 103 respectively, thereby realizing the rotational connection between the main shaft 104 and the equipment housing 1. On the outer surface of the main shaft 104, two first helical gears 105 are fixedly installed at equal intervals, and a spur gear 106 is installed on the outer surface of each first helical gear 105. A limit ring 107 is provided on one side surface of each spur gear 106.

[0020] In this embodiment of the invention, when switching roller positions, the device does not require the robotic arm to drive the execution head to perform a large axial lift. It can directly adjust the machine at the working position close to the workpiece. As the main shaft 104 and the central spur gear 106 rotate at a constant speed, the tangential thrust generated by the meshing of the spur gear 106 drives the rotating ring 2 to slide along the inner wall of the limiting ring 107 on the side of the spur gear 106. This causes the triangular limiting plate 201, the driven gear 204, and the connecting shaft 203 to revolve around the center line of the main shaft 104. During this dynamic process, the end of the connecting shaft 203 slides in place along the preset trajectory of the arc groove 101.

[0021] Reference Figures 1-10Specifically, the rotating assembly includes two rotating rings 2, which are slidably mounted on the inner walls of two limiting rings 107. A limiting plate 201 is fixedly mounted on one side surface of each of the two rotating rings 2. A total of six rotating bearings 202 are located on one side surface of each of the two limiting plates 201, with three rotating bearings distributed in groups of three on each side surface of the two limiting plates 201.

[0022] There are three connecting shafts 203, each of which is fixedly connected to the inner wall of two rotary bearings 202. The connecting shafts 203 are rotatably connected to the limiting plate 201 through the rotary bearings 202. Rolling rollers 205 are distributed on the outer surface of each connecting shaft 203. There are six driven gears 204, which are distributed in pairs on the outer surface of the three connecting shafts 203. The driven gears 204 mesh with the spur gears 106. A positioning hole 206 is provided at the end of each connecting shaft 203.

[0023] In this embodiment of the invention, under the physical premise that the limiting plate 201 is completely fixed, the driven gear 204 drives the connecting shaft 203 to generate high-speed rotation in place under the support of the rotary bearing 202, thereby driving the end rolling roller 205 to generate continuous rotational rolling kinetic energy. At this time, the external industrial robot drives the device to move smoothly along the spatial curve of the edge of the automotive sheet metal part according to the preset teaching trajectory. The rolling roller 205 uses the frictional heat and mechanical pressure generated by the high-speed rotation, combined with the constant axial vertical downward pressure provided by the robotic arm, and the auxiliary physical constraint positioning of the edge path by the meshing groove 102 on the side of the equipment shell 1, to roll, fold and finally press the sheet metal edge into the preset angle of the mold, completing the folding task. During the entire continuous operation, the positioning bearing 103 ensures the coaxiality of the main shaft 104 under complex alternating loads. All reverse impact loads generated during the folding process are directly unloaded onto the rigid bearing mechanism of the equipment shell 1 through the limiting post 302, avoiding the internal precision gears from directly bearing unnecessary shear stress, and ensuring the mechanical accuracy and process consistency of the device under long-term operation cycle.

[0024] Reference Figures 1-10 Specifically, the drive mechanism includes a switching component and a drive component. The switching component includes a limiting hole 3, two electric telescopic rods 301 and two limiting posts 302. The limiting holes 3 are respectively set on one side and the other side surface of the equipment housing 1. The two electric telescopic rods 301 are respectively fixedly installed on one side and the other side surface of the equipment housing 1. Each electric telescopic rod 301 has a corresponding limiting post 302 installed at its extended end. The outer surface of the limiting post 302 is slidably connected to the inner wall of the limiting hole 3, and one end of the limiting post 302 is rotatably inserted into the inner wall of the positioning hole 206.

[0025] In this embodiment of the invention, when a 120-degree rotational displacement is completed, the rotational state of the device can be confirmed by an infrared sensor in conjunction with a receiver. When the rotation is completed, the electric telescopic rod 301 instantly drives the limiting post 302 to extend horizontally, pass through the limiting hole 3 on the side of the device housing 1, and insert into the positioning hole 206 at the end of the connecting shaft 203 currently in the working position. This mechanical interference action rigidly locks the limiting plate 201 onto the overall frame of the device housing 1, making it completely lose its revolution freedom. Subsequently, the drive motor 406 switches to the preset operating speed, and the power is transmitted to the main shaft 104 and the central spur gear 106 along the original path. Since the limiting plate 201 has been locked, the torque generated by the rotation of the spur gear 106 cannot be converted into revolution kinetic energy, but is fully converted into the normal driving force acting on the tooth surface of the driven gear 204.

[0026] The drive assembly includes a connecting arm 4, which is fixedly mounted on the top surface of the equipment housing 1. A transmission bearing 401 is mounted on one side surface of the connecting arm 4. A drive shaft 402 is fixedly mounted on the inner wall of the transmission bearing 401. A second helical gear 403 is mounted on the bottom surface of the drive shaft 402. A protective plate 404 is mounted on one side surface of the equipment housing 1. A reduction gear 405 meshes with the outer surface of the drive shaft 402. A drive motor 406 is fixedly mounted on the top surface of the connecting arm 4. There are two transmission bearings 401, which are respectively distributed on the connecting arm 4. On one side and the other side, a drive shaft 402 is fixedly installed on the inner wall of each transmission bearing 401. The drive shaft 402 is rotatably connected to the connecting arm 4 through the transmission bearing 401. A second helical gear 403 is distributed at the bottom end of each drive shaft 402. The two second helical gears 403 mesh with the two first helical gears 105 respectively. A reduction gear 405 is distributed on the outer surface of each of the two drive shafts 402. The two reduction gears 405 mesh with each other. The output end of the drive motor 406 is fixedly connected to the top end of one of its reduction gears 405.

[0027] Specific usage process: In the initial preparation stage, the overall frame of this device is first rigidly bolted to the end effector flange of the industrial robot through the connecting arm 4, and the electrical circuit of the control electric telescopic rod 301 and the drive motor 406 is simultaneously connected. Before the actual processing cycle starts, another material handling robotic arm equipped with a vacuum suction cup assembly accurately takes out the original automotive sheet metal parts to be processed from the material rack and places them stably in the preset base folding mold cavity. The edges and main body of the automotive sheet metal parts are physically fixed in all directions by the hydraulic side pressure mechanism or pneumatic clamping assembly of the mold, so as to establish a stable physical support benchmark for the subsequent high-pressure roll forming process.

[0028] When the process requires switching between different specifications of rolling rollers 205 according to the sheet metal thickness or edge curvature radius, the device enters the in-situ workstation switching mode. At this time, the electric telescopic rods 301, which are symmetrically arranged on both sides of the inner wall of the equipment housing 1, are started and kept in a fully retracted state, so that the limiting post 302 at its end passes through the limiting hole 3 on the equipment housing 1 and completely disengages from the positioning hole 206 at the end of the current connecting shaft 203. This action releases the rotational constraint of the triangular limiting plate 201 and its load components under the support of three sets of rotating bearings 202, so that it is in a ready state that can freely revolve. Subsequently, the drive motor 406 starts to output torque. The power first drives the two vertically parallel drive shafts 402 to achieve phase synchronous rotation through the transmission bearings 401 via the reduction gear 405. The power is then transmitted to the horizontally arranged main shaft 104 by the second helical gear 403 at the end of the drive shaft 402 and the first helical gear 105 at both ends of the main shaft 104 to form a ninety-degree vertical mesh.

[0029] Since the triangular limiting plate 201 and the three sets of rolling rollers 205 are all integrated within the internal enclosure space of the equipment housing 1, and the rotation radius of the connecting shaft 203 during revolution is highly compatible with the trajectory of the arc groove 101 opened on the inner wall of the equipment housing 1, the entire rotating assembly is spatially restricted within the outline of the equipment housing 1. Compared with the traditional design where the square folding head needs to be moved upward as a whole to avoid interference between the sheet metal parts and the mold, this device does not require the robotic arm to drive the execution head to make a large axial lift when switching roller positions. It can be directly adjusted at the working position close to the workpiece. As the main shaft 104 and the central spur gear 106 rotate at a constant speed, the tangential thrust generated by the meshing of the spur gear 106 drives the rotating ring 2 to slide along the inner wall of the limiting ring 107 on the side of the spur gear 106, causing the triangular limiting plate 201, the driven gear 204 and the connecting shaft 203 to generate planetary revolution around the center line of the main shaft 104. During this dynamic process, the end of the connecting shaft 203 slides in place along the preset trajectory of the arc groove 101.

[0030] When a 120-degree rotational displacement is completed, the rotational state of the equipment can be confirmed by an infrared sensor in conjunction with a receiver. When the rotation is completed, the electric telescopic rod 301 instantly drives the limiting post 302 to extend horizontally, pass through the limiting hole 3 on the side of the equipment housing 1, and insert into the positioning hole 206 at the end of the connecting shaft 203, which is currently in the working position, in a plug-in manner. This mechanical interference action rigidly locks the limiting plate 201 onto the overall frame of the equipment housing 1, making it completely lose its revolution freedom. Subsequently, the drive motor 406 switches to the preset operating speed, and the power is transmitted to the main shaft 104 and the central spur gear 106 along the original path. Since the limiting plate 201 has been locked, the torque generated by the rotation of the spur gear 106 cannot be converted into revolution kinetic energy, but is fully converted into the normal driving force acting on the tooth surface of the driven gear 204.

[0031] With the limiting plate 201 completely fixed, the driven gear 204 drives the connecting shaft 203 to rotate at high speed in place under the support of the rotary bearing 202, which in turn drives the end rolling roller 205 to generate continuous rotational rolling kinetic energy. At this time, the external industrial robot drives the device to move smoothly along the spatial curve of the edge of the automotive sheet metal part according to the preset teaching trajectory. The rolling roller 205 uses the frictional heat and mechanical pressure generated by the high-speed rotation, combined with the constant axial vertical downward pressure provided by the robotic arm, and the auxiliary physical constraint positioning of the edge path by the meshing groove 102 on the side of the equipment shell 1, to roll, fold and finally press the sheet metal edge into the preset angle of the mold, completing the folding task. During the entire continuous operation, the positioning bearing 103 ensures the coaxiality of the main shaft 104 under complex alternating loads. All reverse impact loads generated during the folding process are directly unloaded onto the rigid bearing mechanism of the equipment shell 1 through the limiting column 302, avoiding the internal precision gears from directly bearing unnecessary shear stress, and ensuring the mechanical accuracy and process consistency of the device under long-term operation cycle.

[0032] The above are all preferred embodiments of the present invention and are not intended to limit the scope of protection of the present invention. Therefore, all equivalent changes made in accordance with the structure, shape and principle of the present invention should be covered within the scope of protection of the present invention.

Claims

1. An automatic bending device for automotive sheet metal parts, comprising a housing (1) and an arc-shaped groove (101), wherein the arc-shaped groove (101) is formed on one side and the other side surface of the inner wall of the housing (1), characterized in that: A meshing groove (102) is provided on one side surface of the equipment housing (1). A positioning bearing (103) is fixedly installed on one side surface of the equipment housing (1). A main shaft (104) is fixedly installed on the inner wall of the positioning bearing (103). A first helical gear (105) is fixedly installed on the outer surface of the main shaft (104). A spur gear (106) is fixedly installed on the outer surface of the first helical gear (105). A limit ring (107) is provided on one side surface of the spur gear (106). A drive mechanism is installed on one side surface of the equipment housing (1). A rotating component is installed on the inner wall of the limit ring (107). The rotating assembly includes a rotating ring (2), which is slidably mounted on the inner wall of a limiting ring (107). A limiting plate (201) is fixedly mounted on one side surface of the rotating ring (2). A rotating bearing (202) is fixedly mounted on the inner wall of the limiting plate (201). A connecting shaft (203) is fixedly mounted on the inner wall of the rotating bearing (202). A driven gear (204) is fixedly mounted on the outer surface of the connecting shaft (203). A rolling roller (205) is fixedly mounted on the outer surface of the connecting shaft (203). A positioning hole (206) is provided at the end of the connecting shaft (203).

2. The automatic bending device for automotive sheet metal parts according to claim 1, characterized in that, There are two arc-shaped grooves (101), which are respectively distributed on one side and the other side of the inner wall of the equipment housing (1). There are two positioning bearings (103), which are respectively distributed on one side and the other side of the equipment housing (1). The main shaft (104) is fixedly connected to the inner wall of the two positioning bearings (103). The main shaft (104) is rotatably connected to the equipment housing (1) through the positioning bearings (103). There are two first helical gears (105) that are equally distributed on the outer surface of the main shaft (104). Each outer surface of the first helical gear (105) is correspondingly distributed with a spur gear (106). Each side surface of the spur gear (106) is correspondingly distributed with a limiting ring (107).

3. The automatic bending device for automotive sheet metal parts according to claim 1, characterized in that, There are two limiting plates (201), which are respectively distributed on one side surface of the two spur gears (106). Rotating rings (2) are correspondingly distributed on one side surface of the two limiting plates (201). The two limiting plates (201) are rotatably connected to the limiting rings (107) installed on one side surface of the two spur gears (106) through the rotating rings (2). There are six rotating bearings (202), which are distributed in groups of three on one side surface of the two limiting plates (201).

4. The automatic bending device for automotive sheet metal parts according to claim 1, characterized in that, There are three connecting shafts (203), each of which is fixedly connected to the inner wall of two rotary bearings (202). The connecting shafts (203) are rotatably connected to the limiting plate (201) through the rotary bearings (202). Rolling rollers (205) are distributed on the outer surface of each connecting shaft (203). There are six driven gears (204), which are distributed in pairs on the outer surface of the three connecting shafts (203). The driven gears (204) mesh with the spur gears (106). A positioning hole (206) is provided at the end of each connecting shaft (203).

5. The automatic bending device for automotive sheet metal parts according to claim 1, characterized in that, The drive mechanism includes a switching component and a drive component. The switching component includes a limiting hole (3). The limiting hole (3) is disposed on one side and the other side surface of the equipment housing (1). An electric telescopic rod (301) is fixedly installed on one side surface of the equipment housing (1). A limiting post (302) is installed at the extended end of the electric telescopic rod (301).

6. The automatic bending device for automotive sheet metal parts according to claim 5, characterized in that, There are two electric telescopic rods (301), which are respectively distributed on one side and the other side of the equipment housing (1). Each electric telescopic rod (301) has a corresponding limit post (302) at its output end. The outer surface of the limit post (302) is slidably connected to the inner wall of the limit hole (3), and one end of the limit post (302) is rotatably inserted into the inner wall of the positioning hole (206).

7. The automatic bending device for automotive sheet metal parts according to claim 5, characterized in that, The drive assembly includes a connecting arm (4), which is fixedly installed on the top surface of the equipment housing (1). A transmission bearing (401) is installed on one side surface of the connecting arm (4). A drive shaft (402) is fixedly installed on the inner wall of the transmission bearing (401). A second helical gear (403) is installed on the bottom surface of the drive shaft (402). A protective plate (404) is installed on one side surface of the equipment housing (1). A reduction gear (405) meshes on the outer surface of the drive shaft (402). A drive motor (406) is fixedly installed on the top surface of the connecting arm (4).

8. The automatic bending device for automotive sheet metal parts according to claim 7, characterized in that, There are two transmission bearings (401), which are respectively distributed on one side and the other side of the connecting arm (4). A drive shaft (402) is fixedly installed on the inner wall of each transmission bearing (401). The drive shaft (402) is rotatably connected to the connecting arm (4) through the transmission bearing (401). A second helical gear (403) is distributed at the bottom of each drive shaft (402). The two second helical gears (403) mesh with the two first helical gears (105) respectively. A reduction gear (405) is distributed on the outer surface of each of the two drive shafts (402). The two reduction gears (405) mesh with each other. The output end of the drive motor (406) is fixedly connected to the top of one of its reduction gears (405).

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