Automatic pushing and limiting device for automobile sheet metal part bending

Abstract

The application relates to an automatic pushing and limiting device for automobile sheet metal bending, and relates to the technical field of a sheet metal bending device. The device comprises a workbench and racks installed on both sides of the workbench. A sliding plate is slidably arranged on the racks. A plurality of upper molds are detachably installed on the sliding plate. A lower mold for placing and bending sheet metal is installed on the workbench. The upper mold acts on the lower mold to bend the sheet metal. A placing table is arranged on one side of the workbench, and a material blocking assembly is installed on the other side. An upper feeding assembly, a conveying assembly, a shaping assembly and a pushing assembly are sequentially arranged on the placing table. The conveying assembly sequentially conveys a plurality of sheet metals of the upper feeding assembly to the end of the placing table close to the lower mold. The pushing assembly pushes the sheet metal shaped by the shaping assembly to the end of the material blocking assembly. The application has the effects of reducing the operation personnel close to the dangerous operation area, improving the bending operation efficiency through automatic control and reducing the labor intensity of the operation personnel.

Description

Technical Field

[0001] This application relates to the technical field of sheet metal bending devices, and in particular to an automatic push-limit device for bending automotive sheet metal parts. Background Technology

[0002] CNC bending machines are machines that use equipped molds to bend cold metal sheet parts. They are sheet metal forming machines designed for cold-rolled sheet metal processing and are widely used in sheet metal bending processing in industries such as automobiles.

[0003] However, existing CNC bending machines require manual placement of the sheet metal parts to be bent onto the lower die during loading, and alignment with the desired bending position and posture. This operation causes operators to be too close to the operating area of ​​the machine, which can easily lead to injury if not handled carefully. Furthermore, the need for operators to manually move and adjust the sheet metal parts to be bent multiple times increases their workload and affects bending efficiency. Summary of the Invention

[0004] To address the issues of manual placement and alignment of sheet metal parts during loading, which can easily lead to operator injury and require multiple manual adjustments to the sheet metal parts to be bent, thus affecting bending efficiency, this application provides an automatic push-limit device for bending automotive sheet metal parts.

[0005] This application provides an automatic push-limiting device for bending automotive sheet metal parts, which adopts the following technical solution: An automatic push-limiting device for bending automotive sheet metal parts includes a worktable and a frame mounted on both sides of the worktable. A sliding plate is slidably disposed on the frame, and a plurality of upper dies are detachably mounted on the sliding plate. A lower die for placing and bending sheet metal parts is mounted on the worktable. The upper dies act on the lower dies to bend the sheet metal parts. A placement platform is provided on one side of the worktable, and a material stop assembly is mounted on the other side. A feeding assembly, a conveying assembly, a straightening assembly for straightening the sheet metal parts, and a pushing assembly are sequentially mounted on the placement platform. The conveying assembly sequentially conveys a plurality of sheet metal parts from the feeding assembly to the end of the placement platform near the lower die. The pushing assembly pushes the sheet metal parts straightened by the straightening assembly to the end of the material stop assembly.

[0006] By adopting the above technical solution, the frame on both sides of the workbench, in conjunction with the sliding plate, enables the lifting and lowering of the upper mold. The workbench provides a stable support platform for the lower mold and also provides a working platform for the upper mold to be applied to the lower mold to achieve bending operations. The mounting platform integrates feeding components, conveying components, straightening components, and pushing components, forming a closed-loop conveying path with the material blocking components. This realizes an automated process for sheet metal parts from storage, transmission, posture calibration to precise positioning, which can replace manual operation, reduce the operator's proximity to dangerous work areas, and improve the efficiency and continuity of bending operations through automated control, reduce the labor intensity and safety risks of operators, and improve the efficiency of bending processing.

[0007] Optionally, the feeding assembly includes a storage box for stacking multiple sheet metal parts. The top and bottom of the storage box are open. A conveyor frame is provided on the placement platform. The storage box is mounted on the conveyor frame. A gap is provided between the bottom of the storage box and the upper surface of the conveyor frame. The gap is greater than the thickness of one sheet metal part and less than the thickness of two stacked sheet metal parts. A telescopic cylinder is provided on the conveyor frame. The output end of the telescopic cylinder drives a feeding component. The feeding component drives the sheet metal parts located on the upper surface of the conveyor frame to move outside the storage box.

[0008] By adopting the above technical solution, the storage box can stack and store multiple sheet metal parts. The bottom gap setting ensures that only one sheet metal part is allowed to slide down to the conveyor frame by gravity at a time. With the feeding part driven by the telescopic cylinder, the quantity and time of each feeding are controlled, avoiding jamming or collision deformation caused by multiple parts being conveyed at the same time. Compared with manual picking and placing one piece at a time, it improves the feeding efficiency and stability, reduces the labor intensity of operators, and ensures the continuity and reliability of the feeding process.

[0009] Optionally, the conveying assembly includes a transfer frame with a plurality of actuating components arranged on it. Multiple sets of first and second bases are provided on the mounting platform. A power source is mounted on one side of the first base, and a first connecting rod is rotatably mounted on the other side. The power source drives the first connecting rod to rotate. An actuating rod is rotatably connected to the other end of the first connecting rod. A second connecting rod is rotatably mounted on the second base, and the other end of the second connecting rod is rotatably connected to the other end of the actuating rod. A support rod is provided on the actuating rod, and the other end of the support rod is rotatably connected to the transfer frame to drive multiple sheet metal parts.

[0010] By adopting the above technical solution, the first link, the action link, and the second link form a linkage mechanism. The power source converts the rotational motion into the reciprocating motion of the transfer frame through the linkage mechanism. The actuating component contacts the surface of the sheet metal part to generate friction, which pushes the sheet metal part to move along the transfer frame towards the bending station, ensuring that the sheet metal part maintains a stable posture and spacing during the transfer process, and providing a reliable foundation for the subsequent straightening and pushing processes.

[0011] Optionally, the straightening component includes a first driving member, which is mounted on the mounting platform. The output shaft of the first driving member is fitted with a linkage member. One end of the linkage member is rotatably connected to a third link, and the other end is rotatably connected to a fourth link. The other end of the third link is rotatably connected to a first straightening member, and the other end of the fourth link is rotatably connected to a second straightening member. Both the first and second straightening members are slidably disposed on the support base. The conveyor frame is located between the first and second straightening members to straighten the sheet metal parts.

[0012] By adopting the above technical solution, the linkage, the third link, and the fourth link form a linkage mechanism. The first driving component drives the first and second alignment components to slide along the mounting platform through the linkage mechanism, forming a bidirectional centering adjustment structure. When the sheet metal part is conveyed to the alignment area, the first and second alignment components move synchronously, clamping and calibrating the sheet metal part to the preset position. Compared with manual visual adjustment or simple mechanical limiting, this structure can achieve higher precision automatic calibration, providing a high-precision processing benchmark for bending operations.

[0013] Optionally, both the first and second aligners are equipped with sliders at their bottoms, the mounting platform is provided with a groove, the sliders are slidably disposed in the groove, and multiple rollers are arranged on both the first and second aligners.

[0014] By adopting the above technical solution, the cooperation between the slider and the groove ensures the straightness and stability of the movement of the first and second aligners. The rollers can reduce the friction between the aligner and the sheet metal surface during the alignment process. The rolling contact provides uniform clamping force and prevents the sheet metal from deforming due to excessive local stress.

[0015] Optionally, a torque sensor is provided on both the first and second alignment members.

[0016] By adopting the above technical solution, the torque sensor monitors the magnitude of the force exerted by the first and second alignment parts when they contact the sheet metal parts in real time. When the detected torque exceeds the preset threshold, it immediately feeds back a signal to the control component, which controls the first drive component to adjust the moving speed or force of the first and second alignment parts, thereby achieving flexible adaptive adjustment, effectively protecting the sheet metal parts from damage, and improving the device's adaptability to sheet metal parts of different specifications and processing reliability.

[0017] Optionally, the pushing component includes a first mounting base, on which a second driving member and a plurality of first lead screws are mounted. The second driving member drives the first lead screws to rotate. A first movable seat is threadedly connected to the plurality of first lead screws. A support is provided on the first movable seat. A first guide post is provided on the support. A guide sleeve is fitted on the first guide post. A follower seat is connected to the guide sleeve. A pushing member is connected to the top of the follower seat. A guide wheel is provided on one side of the follower seat. A base plate is provided on one side of the first mounting base. A slide rail is provided on the base plate. The guide wheel slides in the slide rail to drive the pushing member to rise and move until the sheet metal part abuts against the stop component.

[0018] By adopting the above technical solution, the second driving component converts the rotational motion into the linear motion of the first moving seat through the first lead screw transmission. With the guidance structure of the guide column and guide sleeve, it ensures that the pushing component moves smoothly up and down and horizontally. The guide wheel moves along the trajectory of the slide rail, controlling the moving path and positioning accuracy of the pushing component, so that the sheet metal part maintains a stable posture during the pushing process and accurately abuts against the stop assembly.

[0019] Optionally, the material blocking assembly includes a second mounting base, which is mounted on the side of the frame near the worktable. The second mounting base is equipped with a third driving component, a second lead screw, and a second guide post. The third driving component is driven to connect to the second lead screw. A second movable seat is threadedly connected to the second lead screw. The second movable seat is slidably disposed on the second guide post. A bracket is mounted on the second movable seat, and a plurality of stop fingers are mounted on the side of the bracket near the lower mold.

[0020] By adopting the above technical solution, the third driving component drives the second moving seat to move along the second guide post through the second lead screw transmission, realizing flexible adjustment of the stop finger position to adapt to the positioning requirements of sheet metal parts of different sizes. The stop finger is set to provide a limiting boundary for the sheet metal part. When the pushing component pushes the sheet metal part to the stop component, the stop finger contacts the edge of the sheet metal part and prevents it from moving further, ensuring that the sheet metal part is in the preset position before bending.

[0021] Optionally, a control component is also included, which is electrically connected to the feeding component, the conveying component, the straightening component, the pushing component, and the blocking component, respectively.

[0022] By adopting the above technical solution, the control component can collect data from each component in real time and coordinate and control the action sequence and parameters of each component according to the preset program. It can also automatically adjust the feeding rhythm, conveying speed, straightening force and pushing position according to the sheet metal parts specifications, so as to realize the fully automated and intelligent operation of the entire process.

[0023] In summary, this application includes at least one of the following beneficial technical effects: This device can automate the bending process of automotive sheet metal parts, including automatic feeding, conveying, straightening and positioning. Through the coordinated operation of the straightening component, pushing component and blocking component, the accurate position and posture of the sheet metal parts before bending are ensured, so that the upper and lower dies can accurately bend the sheet metal parts. This reduces the direct contact between the operator and the device's operating area, reduces the risk of operator injury, and ensures the personal safety of the operator. The gap between the bottom of the storage box and the upper surface of the conveyor rack allows the bottom sheet metal parts to be pushed out individually by the feeding components, while the upper sheet metal parts cannot fall at the same time due to the smaller gap. This controls the number of sheet metal parts that are discharged, ensuring that only one sheet metal part can be sent from the bottom of the storage box to the conveyor rack at a time. This makes the subsequent conveying and processing orderly, reduces problems such as sheet metal parts stacking and conveying chaos caused by multiple sheet metal parts being discharged at the same time, and improves the accuracy and reliability of feeding. Attached Figure Description

[0024] Figure 1 This is a structural schematic diagram of an embodiment of this application; Figure 2 This is a partial structural schematic diagram of an embodiment of this application; Figure 3 This is a schematic diagram of the structure of the feeding component and the conveying component in the embodiments of this application; Figure 4 This is a schematic diagram of the structure of the regularized component in the embodiments of this application; Figure 5 This is a schematic diagram of the push component in an embodiment of this application; Figure 6 This is a structural schematic diagram of the push component from another angle in an embodiment of this application; Figure 7 This is a schematic diagram of the structure of the material blocking assembly, frame, and worktable in the embodiments of this application.

[0025] Explanation of reference numerals in the attached figures: 1. Workbench; 11. Frame; 12. Sliding plate; 13. Upper mold; 14. Lower mold; 15. Hydraulic cylinder; 2. Placement platform; 3. Feeding assembly; 31. Storage box; 32. Conveyor frame; 33. Telescopic cylinder; 34. Feeding component; 4. Conveying assembly; 41. Transfer frame; 411. Actuating component; 42. First base; 43. Power source; 44. First connecting rod; 45. Actuating rod; 46. Support rod; 47. Second base; 48. Second connecting rod; 5. Steering assembly; 51. First driving component; 52. Linkage component; 53. Third connecting rod; 54. Fourth connecting rod; 55. 551. Slider; 552. Roller; 56. Second guide component; 6. Pushing assembly; 61. First mounting base; 611. Second driving component; 612. First lead screw; 613. Third guide post; 62. First moving seat; 63. Support; 631. First guide post; 64. Follower seat; 65. Pushing component; 66. Guide wheel; 67. Base plate; 671. Slide rail; 7. Stopping assembly; 71. Second mounting base; 711. Third driving component; 712. Second lead screw; 713. Second guide post; 72. Second moving seat; 73. Bracket; 74. Stop finger; 8. Sheet metal part. Detailed Implementation

[0026] It should be noted that, unless otherwise specified, the embodiments and features described in the present invention can be combined with each other.

[0027] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicating orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, are only for the convenience of describing the 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, and therefore should not be construed as a limitation of the invention. Furthermore, the terms "first," "second," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined with "first," "second," etc., may explicitly or implicitly include one or more of that feature. In the description of this invention, unless otherwise stated, "a plurality of" means two or more.

[0028] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art will understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0029] The following is in conjunction with the appendix Figures 1-7 This application will be described in further detail.

[0030] This application discloses an automatic push-limiting device for bending automotive sheet metal parts, referring to... Figure 1 An automatic push-limiting device for bending automotive sheet metal parts includes a worktable 1 and a frame 11 installed on both sides of the worktable 1. A sliding plate 12 is slidably mounted on the frame 11, and several upper molds 13 are detachably mounted on the sliding plate 12. A lower mold 14 for placing and bending sheet metal parts 8 is installed on the worktable 1. The upper molds 13 act on the lower mold 14 to bend the sheet metal parts 8. A placement platform 2 is provided on one side of the worktable 1, and a material stop assembly 7 is installed on the other side. A feeding assembly 3, a conveying assembly 4, a straightening assembly 5 for straightening the sheet metal parts 8, and a pushing assembly 6 are sequentially installed on the placement platform 2. The conveying assembly 4 sequentially conveys several sheet metal parts 8 from the feeding assembly 3 to the end of the placement platform 2 near the lower mold 14. The straightening assembly 5 straightens the sheet metal parts 8 near the end of the lower mold 14. The pushing assembly 6 pushes the straightened sheet metal parts 8 to the end of the material stop assembly 7. The sliding plate 12 drives the upper molds 13 to act on the lower mold 14 to bend the sheet metal parts 8.

[0031] In this device, the workbench 1 provides an installation platform for the lower mold 14 and also provides a working surface for bending the sheet metal part 8. The workbench 1 bears the weight of the sheet metal part 8 during the bending process and the pressure applied by the upper mold 13. The frame 11 provides a sliding rail and support structure for the sliding plate 12. A slide rail 671 is provided on the frame 11, and a slider 551 is installed on the sliding plate 12. The slider 551 slides on the slide rail 671, so that the sliding plate 12 can slide up and down on the surface of the frame 11, ensuring the stability and guidance of the sliding plate 12 during the sliding process, thereby driving the upper mold 13 and the lower mold 14 to work together to realize the bending operation of the sheet metal part 8.

[0032] The driving component of the sliding plate 12 is a hydraulic cylinder 15 symmetrically arranged on the frame 11. An oil tank is installed between the two frames 11, and the oil tank is connected to the hydraulic cylinder 15 to provide power for the operation of the hydraulic cylinder 15. An upper mold 13 is installed at the bottom of the sliding plate 12. The upper mold 13 is detachably mounted on the sliding plate 12 through a clamp. The sliding plate 12 transmits the power of the hydraulic cylinder 15 to the upper mold 13, causing the upper mold 13 to move closer to or away from the lower mold 14, applying pressure to the sheet metal part 8 placed on the lower mold 14, thereby realizing the bending action of the sheet metal part 8. The upper mold 13 and the lower mold 14 with different shapes and sizes can achieve different types of bending effects. The lower mold 14 is used to place the sheet metal part 8 and works together with the upper mold 13 to provide support and constraint for the bending of the sheet metal part 8. The surface shape and size of the lower mold 14 match the upper mold 13 to ensure that the sheet metal part 8 can be accurately deformed during the bending process.

[0033] The mounting platform 2 is located on one side of the workbench 1, providing installation positions for the feeding assembly 3, conveying assembly 4, sizing assembly 5, and pushing assembly 6. It provides a stable platform for the feeding, conveying, sizing, and pushing operations of the sheet metal part 8, serving as a transition area for the sheet metal part 8 before conveying and processing. The stop assembly 7 is installed on the other side of the workbench 1 to block the sheet metal part 8, providing an accurate boundary for its positioning. When the pushing assembly 6 pushes the sheet metal part 8, the stop assembly 7 ensures that the sheet metal part 8 accurately stops at the bending position, guaranteeing the positional accuracy of the sheet metal part 8 during bending.

[0034] The feeding assembly 3 is used to place the sheet metal parts 8 onto the conveying assembly 4, realizing the automatic feeding function of the sheet metal parts 8. Through automated feeding operations, the labor intensity and safety risks of manual feeding are reduced, and the efficiency and accuracy of feeding are improved. The conveying assembly 4 sequentially conveys several sheet metal parts 8 from the feeding assembly 3 to the end of the mounting table 2 near the lower mold 14, realizing the conveying function of the sheet metal parts 8 on the mounting table 2. Through a certain conveying speed and method, it is ensured that the sheet metal parts 8 can be conveyed to the designated position according to the predetermined path and sequence, realizing the automatic conveying of the sheet metal parts 8, reducing manual intervention, and improving the efficiency and accuracy of conveying.

[0035] The straightening component 5 is used to straighten the sheet metal part 8 that is conveyed to the end of the mounting table 2 near the lower mold 14, so that the sheet metal part 8 can be in a proper position and posture during the pushing process, ensuring the positional accuracy of the sheet metal part 8 before bending, so that the sheet metal part 8 can cooperate more accurately with the upper mold 13 and the lower mold 14 during bending, improving the bending quality and accuracy, and reducing the scrap rate caused by inaccurate position of the sheet metal part 8.

[0036] The pushing component 6 pushes the sheet metal part 8, which is regulated by the regulating component 5, to the end of the stop component 7. After the sheet metal part 8 is regulated, the pushing component 6 can accurately push the sheet metal part 8 to the bending position, prepare for the bending operation, realize the final positioning of the sheet metal part 8, and enable the bending operation to proceed smoothly.

[0037] This automatic push-limit device for bending automotive sheet metal parts 8 automates the bending process, including automatic feeding, conveying, straightening, and positioning. Working in conjunction with the upper die 13 and lower die 14, it completes the bending of the sheet metal part 8. The automatic feeding and conveying process reduces manual operation, alleviating the operator's workload and safety risks, and improving the bending efficiency of the sheet metal part 8. Through the coordinated operation of the straightening component 5, the pushing component 6, and the stop component 7, the device ensures the accurate position and posture of the sheet metal part 8 before bending, enabling the upper die 13 and lower die 14 to accurately bend the sheet metal part 8. This improves the processing accuracy of the sheet metal part 8, ensures the stability and consistency of bending quality, reduces direct contact between the operator and the device's operating area, lowers the risk of operator injury, and ensures the operator's personal safety.

[0038] For details, please refer to Figures 1-3 The feeding assembly 3 includes a storage box 31 for stacking multiple sheet metal parts 8. The top and bottom of the storage box 31 are open. A conveyor frame 32 is provided on the placement platform 2. The storage box 31 is installed on the conveyor frame 32. A gap is provided between the bottom of the storage box 31 and the upper surface of the conveyor frame 32. The gap is greater than the thickness of one sheet metal part 8 and less than the thickness of two stacked sheet metal parts 8. A telescopic cylinder 33 is provided on the conveyor frame 32. The output end of the telescopic cylinder 33 is connected to a feeding component 34. The feeding component 34 drives the sheet metal parts 8 located on the upper surface of the conveyor frame 32 to move outside the storage box 31.

[0039] The storage box 31 provides storage space for multiple sheet metal parts 8. Its top opening facilitates the placement and stacking of multiple sheet metal parts 8 inside the storage box 31, while the bottom opening allows the bottom sheet metal part 8 to be easily moved out of the storage box 31 during subsequent operations. This orderly storage of the sheet metal parts 8 ensures that the feeding component 3 can continuously supply sheet metal parts 8 to the subsequent conveying component 4. The stacking method effectively utilizes the space of the storage box 31, increasing the number of sheet metal parts 8 that can be stored at one time and reducing the frequency of replenishing sheet metal parts 8.

[0040] The conveyor frame 32 supports multiple sheet metal parts 8 within the storage box 31. The storage box 31 is suspended on the conveyor frame 32, with its sides supported on the mounting platform 2 for stability. A gap is provided between the bottom of the storage box 31 and the upper surface of the conveyor frame 32, providing necessary space for the conveying of the sheet metal parts 8. Furthermore, the telescopic cylinder 33 provides the installation position and movement power for the feeding component 34, enabling it to move towards the sheet metal parts 8 at the bottom of the storage box 31, thus pushing the sheet metal parts 8. The telescopic cylinder 33 can extend and retract according to preset commands, controlling the movement frequency and amplitude of the feeding component 34, thereby accurately pushing the sheet metal parts 8 located on the upper surface of the conveyor frame 32 to the outside of the storage box 31. This transfer of the sheet metal parts 8 from the storage box 31 to the conveyor frame 32 ensures their smooth entry into subsequent conveying processes.

[0041] Specifically, the gap is greater than the thickness of a single sheet metal part 8 but less than the thickness of two stacked sheet metal parts 8. This allows the bottom sheet metal part 8 to be pushed out individually by the feeding component 34, while the upper sheet metal parts 8 cannot fall simultaneously due to the smaller gap. This controls the number of sheet metal parts 8 being discharged, ensuring that only one sheet metal part 8 is fed from the bottom of the storage box 31 to the conveyor frame 32 at a time. This ensures orderly subsequent conveying and processing, reducing problems such as stacking and chaotic conveying caused by multiple sheet metal parts 8 being discharged simultaneously, and improving the accuracy and reliability of feeding. The feeding component 34 can be L-shaped, with one end stably connected to the telescopic cylinder 33, and the other end adjusted to fit the gap, allowing it to extend into the gap and push the bottom sheet metal part 8 to the outside of the storage box 31.

[0042] The conveying assembly 4 includes a transfer frame 41, on which several actuating elements 411 are arranged. The mounting platform 2 has multiple sets of first bases 42 and second bases 47. A power source 43 is mounted on one side of the first base 42, and a first connecting rod 44 is rotatably mounted on the other side. The power source 43 drives the first connecting rod 44 to rotate. An actuating rod 45 is rotatably connected to the other end of the first connecting rod 44. A second connecting rod 48 is rotatably mounted on the second base 47, and its other end is rotatably connected to the other end of the actuating rod 45. A support rod 46 is mounted on the actuating rod 45, and its other end is connected to the transfer frame 41 to drive multiple sheet metal parts 8. The actuating elements 411 are arranged on the transfer frame 41, and when the transfer frame 41 moves, they provide a certain limiting and pushing effect on the sheet metal parts 8 placed on the conveying frame 32, which helps maintain a suitable distance between the sheet metal parts 8. The distance between multiple toggle pieces 411 is set by the sheet metal part 8 in width, so that the sheet metal part 8 can be accommodated between two toggle pieces 411.

[0043] The first base 42 can fix the power source 43 and also provide rotational support for the first connecting rod 44, ensuring that the first connecting rod 44 can rotate stably under the drive of the power source 43. The power source 43 converts electrical energy or other forms of energy into mechanical energy to drive the first connecting rod 44 to rotate, providing power for the movement of the transfer frame 41. The power source 43 can be a motor, and the output power and speed can be adjusted according to actual needs to control the conveying speed of the transfer frame 41 to meet the needs of conveying and bending sheet metal parts 8. The first connecting rod 44 transmits the rotational motion of the power source 43 to the actuating rod 45, which rotates under the drive of the power source 43, thereby driving the actuating rod 45 to move.

[0044] The second base 47 is used to rotatably mount the second connecting rod 48, ensuring that the second connecting rod 48 can rotate under the drive of the actuating rod 45. The second connecting rod 48, the first connecting rod 44, and the actuating rod 45 together form a linkage mechanism, assisting the actuating rod 45 in realizing motion control of the transfer frame 41, enabling the transfer frame 41 to transport multiple sheet metal parts 8. In this embodiment, multiple sets of linkage mechanisms, as well as the first base 42 and the second base 47, can be set to jointly drive the transfer frame 41 to move and smoothly transport multiple sheet metal parts 8.

[0045] The actuating rod 45 drives the transfer frame 41 to move along a predetermined path and speed via the support rod 46, thereby transferring the sheet metal part 8. The support rod 46 connects the actuating rod 45 and the transfer frame 32, ensuring that the power of the actuating rod 45 can be effectively transmitted to the transfer frame 41. This allows the transfer frame 32 to move accurately in a straight line under the drive of the actuating rod 45, ensuring that the sheet metal part 8 can be smoothly transferred to the designated position and improving the transfer efficiency and accuracy of the transfer assembly 4.

[0046] refer to Figure 1 , Figure 2 and Figure 4 To facilitate the straightening operation of the sheet metal part 8, which is conveyed to the lower mold 14, a straightening component 5 is provided. The straightening component 5 includes a first driving component 51, which is mounted on the mounting platform 2. A linkage component 52 is sleeved on the output shaft of the first driving component 51. One end of the linkage component 52 is rotatably connected to a third connecting rod 53, and the other end is rotatably connected to a fourth connecting rod 54. The other end of the third connecting rod 53 is rotatably connected to a first straightening component 55, and the other end of the fourth connecting rod 54 is rotatably connected to a second straightening component 56. Both the first straightening component 55 and the second straightening component 56 are slidably mounted on the mounting platform 2. The conveyor frame 32 is located between the first straightening component 55 and the second straightening component 56 to straighten the sheet metal part 8.

[0047] The first driving component 51, acting as a power source 43, drives the linkage 52 to rotate via its output shaft, providing power for the entire straightening action. The first driving component 51 can be a motor; controlling its speed and direction allows for adjustment of the straightening force and direction of the sheet metal part 8, adapting to the processing requirements of sheet metal parts 8 of different specifications. The driving force is transmitted to the third link 53 and the fourth link 54 via the linkage 52, causing relative motion between them. The third link 53 and the fourth link 54 form a double-linkage mechanism, converting the rotational motion of the linkage 52 into linear sliding of the first straightening component 55 and the second straightening component 56. This achieves a conversion of motion form and amplification of force, ensuring that the straightening components can generate sufficient displacement and force to correct the sheet metal part 8.

[0048] Specifically, the first guide piece 55 and the second guide piece 56 are slidably mounted on the mounting platform 2 and move towards or away from each other under the drive of the linkage mechanism to squeeze, position and correct the sheet metal part 8 on the conveyor frame 32 so that it reaches the preset position and posture, providing accurate positioning for the subsequent bending process.

[0049] Furthermore, the mounting platform 2 is equipped with guide rails or grooves to ensure that the first aligner 55 and the second aligner 56 can slide smoothly along the predetermined path, reducing friction and jamming, and improving the smoothness and repeatability of the aligning action.

[0050] In this application, both the first guide piece 55 and the second guide piece 56 are equipped with sliders 551 at their bottoms, and the mounting platform 2 is provided with a sliding groove. The sliders 551 slide within the sliding groove, and multiple rollers 552 are arranged on both the first guide piece 55 and the second guide piece 56. The sliders 551 and the sliding groove on the mounting platform 2 are designed to cooperate with each other, allowing the first guide piece 55 and the second guide piece 56 to slide smoothly within the sliding groove. This enables flexible movement of the first guide piece 55 and the second guide piece 56, allowing for position adjustment of the sheet metal part 8 and ensuring that the sheet metal part 8 is in the correct position before bending, thus providing accurate positioning for subsequent bending operations.

[0051] When the first straightening component 55 and the second straightening component 56 straighten the sheet metal part 8, the roller 552 can contact the side surface of the sheet metal part 8. The roller 552 can reduce the friction between the straightening component and the sheet metal part 8, making the straightening operation smoother and preventing scratches on the surface of the sheet metal part 8 to a certain extent. In addition, the arrangement of multiple rollers 552 can apply force to the sheet metal part 8 more evenly, ensuring that the sheet metal part 8 is accurately straightened to the appropriate position. The rolling motion of the rollers 552 makes the straightening operation more flexible, better adaptable to the straightening needs of sheet metal parts 8 with different shapes and sizes, and improves the efficiency and accuracy of straightening.

[0052] A buffer is provided on the outside of the roller 552, which can play a buffering role when the roller 552 comes into contact with the sheet metal part 8. When the roller 552 comes into contact with the sheet metal part 8 and applies force to it, the buffer can absorb part of the impact force, reduce the instantaneous pressure on the sheet metal part 8, and prevent the sheet metal part 8 from deforming or being damaged due to excessive force, thus effectively protecting the sheet metal part 8.

[0053] Specifically, both the first straightening component 55 and the second straightening component 56 are equipped with torque sensors. These torque sensors can monitor the magnitude of the torque applied to the sheet metal part 8 during the straightening process in real time. By measuring the torque, the force exerted by the straightening component on the sheet metal part 8 can be understood, thereby determining whether the sheet metal part 8 is being straightened correctly and whether there is excessive or insufficient force. Based on the information fed back by the torque sensors, the output of the first driving component 51 can be adjusted in a timely manner to ensure that the force applied by the straightening component remains within a suitable range, ensuring that the sheet metal part 8 is straightened to the ideal state, while avoiding damage or deformation of the sheet metal part 8 due to improper force application.

[0054] refer to Figure 1 , Figure 2 , Figure 5 and Figure 6 To push and abut the finished sheet metal part 8 to the stop assembly 7, a pushing assembly 6 is provided. The pushing assembly 6 includes a first mounting base 61, on which a second driving member 611 and several first lead screws 612 are mounted. The second driving member 611 drives the first lead screws 612 to rotate. The several first lead screws 612 are threadedly connected to a first movable seat 62. A support 63 is provided on the first movable seat 62. A first guide post 631 is provided on the support 63. A guide sleeve is fitted on the first guide post 631. The guide sleeve is connected to a follower seat 64. A pusher 65 is connected to one end of the follower seat 64. A guide wheel 66 is provided on one side of the follower seat 64. A base plate 67 is provided on one side of the first mounting base 61. A slide rail 671 is provided on the base plate 67. The guide wheel 66 slides in the slide rail 671 to drive the pusher 65 to rise and move until the sheet metal part 8 abuts against the stop assembly 7.

[0055] The first mounting base 61 serves as the basic support for the pushing assembly 6, providing a mounting platform for components such as the second drive component 611 and the first lead screw 612. The second drive component 611 acts as a power source 43, driving the first lead screw 612 to rotate and transmitting its own power to the first lead screw 612, providing power output for the pushing assembly 6. The second drive component 611 can be a motor, adjusting its speed and direction according to control commands to control the rotation of the first lead screw 612.

[0056] The first lead screw 612 rotates under the drive of the second drive member 611 and is connected to the first moving seat 62 through threaded transmission. This converts the rotational motion of the second drive member 611 into the linear motion of the first moving seat 62, thereby adjusting the position of the first moving seat 62. This achieves effective power transmission and motion form conversion, and can precisely control the moving distance and position of the first moving seat 62. This improves the positioning accuracy of the pushing component 6 and ensures that the pushing member 65 can accurately push the sheet metal part 8 to the designated position.

[0057] Furthermore, a third guide post 613 is also installed on the first mounting base 61. A first movable seat 62 is fitted over the third guide post 613. The third guide post 613 guides the movement of the first movable seat 62. The first movable seat 62 is threadedly connected to the first lead screw 612 and moves linearly under the drive of the first lead screw 612 and the third guide post 613. Simultaneously, the first movable seat 62 provides an installation position for the support 63, transmitting its own movement to the support 63 and subsequent components. The support 63 fixes the first guide post 631, providing support and positioning. A guide sleeve is fitted over the first guide post 631, guiding the follower seat 64 and restricting its movement direction, ensuring that the follower seat 64 can only move along the axial direction of the first guide post 631. The guide sleeve is fitted over the first guide post 631 and connected to the follower seat 64, allowing the follower seat 64 to slide smoothly on the first guide post 631, thus guiding and supporting the follower seat 64.

[0058] The follower seat 64 connects the guide sleeve and the pusher 65. Guided by the guide sleeve, it moves along the first guide post 631, transmitting its own motion to the pusher 65, causing the pusher 65 to rise and move. The pusher 65 is connected to the end of the follower seat 64 near the lower mold 14 and is used to push the sheet metal part 8, converting the motion of the follower seat 64 into a pushing force on the sheet metal part 8. This allows the sheet metal part 8 to be accurately pushed and abutted against the stop assembly 7, providing an accurate workpiece position for subsequent bending operations.

[0059] The guide wheel 66 is located on one side of the follower seat 64 and cooperates with the slide rail 671 on the base plate 67 to guide the movement direction of the follower seat 64. It also provides support during the movement of the follower seat 64, making the pushing action smoother. The slide rail 671 on the base plate 67 provides a movement track for the guide wheel 66, guiding its movement and indirectly guiding the movement of the follower seat 64 and the pusher 65. This ensures the accuracy of the movement trajectory of the follower seat 64 and the pusher 65, improves the movement accuracy and stability of the pushing assembly 6, and guarantees that the sheet metal part 8 can be accurately pushed to the stop assembly 7, providing reliable positioning for the bending operation of the sheet metal part 8.

[0060] In this application, the slide rail 671 includes a lifting section and a translation section. The higher end of the lifting section and the translation section are connected by an arc transition. The guide wheel 66 smoothly transitions along the arc section, driving the pusher 65 to rise first and detach from the conveyor frame, and then move horizontally to push the sheet metal part 8 to the stop assembly 7, avoiding jamming. When there is no need to push the sheet metal part 8, the guide wheel 66 is located at the lowest position of the lifting section, avoiding interference with the conveyor assembly 4 and the conveyed sheet metal part 8. When pushing the sheet metal part 8, the second drive member 611 drives the first lead screw 612 to rotate, and the first moving seat 62 drives the follower seat 64 to rise along the first guide post 631. At the same time, the guide wheel 66 of the follower seat 64 moves at the lifting end, realizing the forward movement of the pusher 65. If the sheet metal part 8 has not yet reached the end of the stop assembly 7, the second drive member 611 can continue to be driven, so that the guide wheel 66 continues to move in the translation section until the pusher 65 pushes the sheet metal part 8 to the end of the stop assembly 7, realizing the pushing operation of sheet metal parts 8 of different sizes.

[0061] refer to Figure 1 and Figure 7 The material stop assembly 7 includes a second mounting base 71, which is mounted on the side of the frame 11 near the worktable 1. A third drive component 711, a second lead screw 712, and a second guide post 713 are mounted on the second mounting base 71. The third drive component 711 drives the second lead screw 712, and a second movable seat 72 is threadedly connected to the second lead screw 712. The second movable seat 72 is slidably mounted on the second guide post 713. A bracket 73 is adjustablely mounted on one side of the second movable seat 72, and several stop fingers 74 are slidably mounted on the side of the bracket 73 near the lower mold 14. The second mounting base 71 provides a mounting foundation for components such as the third drive component 711, the second lead screw 712, and the second guide post 713. The third drive component 711 serves as the power source 43 of the material stop assembly 7, driving the second lead screw 712 to rotate. The third drive component can be a motor, which adjusts its speed and direction according to control commands, thereby controlling the rotation of the second lead screw 712 and providing power output to the material stop assembly 7.

[0062] The second lead screw 712 rotates under the drive of the third drive member 711, and is connected to the second movable seat 72 via a threaded transmission, converting the rotational motion of the third drive member 711 into the linear motion of the second movable seat 72, thereby achieving position adjustment of the second movable seat 72. The second guide post 713 provides guidance for the second movable seat 72, restricting the movement direction of the second movable seat 72 so that it can only move along the axial direction of the second guide post 713. The bracket 73 is mounted on the second movable seat 72 to fix the stop finger 74, providing support and positioning for the stop finger 74, ensuring the stability of the stop finger 74, and enabling the stop finger 74 to accurately block the sheet metal part 8. An adjustment groove is provided at the bottom of the bracket 73, and a locking member is provided in the adjustment groove to fix the bracket 73 to one side of the second movable seat 72, so as to adapt to sheet metal parts 8 of different thicknesses and different heights of the lower mold 14.

[0063] To ensure stable movement of the bracket 73, a second mounting base 71, a second lead screw 712, a second guide post 713, and a second moving base 72 are installed on both brackets 73. The rotation of the second lead screw 712 on the other side can be transmitted to the second lead screw 712 through the transmission of the synchronous belt, thereby realizing the rotational movement of the second lead screw 712.

[0064] The stop finger 74 is installed on the side of the bracket 73 near the lower mold 14 to block the sheet metal part 8. When bending is required, the third drive component 711 controls the stop finger 74 to be in the appropriate position, enabling the bending of the sheet metal part 8. When the pushing component 6 pushes the sheet metal part 8, the stop finger 74 acts as a stop, ensuring that the sheet metal part 8 stops accurately at the bending position, providing accurate positioning for the bending of the sheet metal part 8. Specifically, the bracket 73 is provided with a moving groove. One end of the stop finger 74 moves within the moving groove via a mating block, while the other end can abut against the sheet metal part 8. That is, the stop finger 74 is adjustable on the bracket 73. The positions of multiple stop fingers 74 and the distance between them can be adjusted according to the width of the sheet metal part 8 to be bent, making it suitable for bending operations of sheet metal parts 8 of different sizes.

[0065] The device also includes a control component, which is electrically connected to the feeding component 3, the conveying component 4, the straightening component 5, the pushing component 6, and the blocking component 7. The control component receives status information from components such as the telescopic cylinder 33 in the feeding component 3, and sends control commands to these components according to the preset program and the processing requirements of the sheet metal parts 8, so as to realize the automation of the feeding process, ensure the accuracy of feeding, and flexibly adjust the feeding rhythm according to different production needs, thereby reducing production stoppages or damage to the sheet metal parts 8 caused by improper feeding.

[0066] The control component monitors the operating status of the power source 43 in the conveying component 4, including parameters such as speed and direction. Based on the specifications and processing requirements of the sheet metal part 8, it controls the operation of the power source 43, thereby controlling the moving speed and direction of the conveyor frame 32, and the conveying action of the actuating component 411 on the sheet metal part 8. Simultaneously, counting sensors and position sensors are installed on the conveyor frame 32 of the conveying component 4, which can detect the quantity, position, and orientation of the sheet metal parts 8 on the conveying component 4 in real time. The control component receives feedback information from each sensor in the conveying component 4 to determine the conveying position and status of the sheet metal parts 8, achieving orderly conveying of the sheet metal parts 8. The control component transmits the feedback information received from each sensor in the conveying component 4 to the loading component 3, further controlling the movement of the telescopic cylinder 33, so that it orderly pushes the sheet metal parts 8 onto the conveying component 4.

[0067] The control component can control the output of the first drive component 51 and adjust the movement of the first straightening component 55 and the second straightening component 56 to achieve precise straightening of the sheet metal part 8. The control component receives feedback data from the torque sensor and adjusts the straightening action in real time according to the force on the sheet metal part 8 to ensure that the sheet metal part 8 is straightened to the appropriate position and posture. The control component can control the operation of the second drive component 611 and adjust the rotation of the first lead screw 612, thereby precisely controlling the movement of the first moving seat 62, the follower seat 64 and the pusher component 65 to ensure that the sheet metal part 8 is accurately pushed to the stop component 7 and to ensure the positioning accuracy of the sheet metal part 8 before bending.

[0068] Before the pushing component 6 pushes the sheet metal part 8, the control component controls the operation of the third driving component 711, adjusts the rotation of the second lead screw 712, and then controls the position of the second moving seat 72, the bracket 73 and the stop finger 74. A position sensor is set on the bracket 73 in the stop component 7 to detect the position of the stop finger 74. The control component receives the feedback information from the position sensor and determines whether the position of the stop finger 74 is accurate, ensuring that the sheet metal part 8 can be accurately blocked at the bending position, improving the positioning accuracy of the sheet metal part 8 and ensuring the accuracy of the bending operation.

[0069] The implementation process of an automatic push-limiting device for bending automotive sheet metal parts according to an embodiment of this application is as follows: Material feeding stage: Sheet metal parts 8 are stacked in storage box 31. The top and bottom of storage box 31 are open. Telescopic cylinder 33 drives feeding part 34. Utilizing the gap between the bottom of storage box 31 and the upper surface of conveyor frame 32, only one sheet metal part 8 is pushed out of storage box 31 to conveyor frame 32 at a time, realizing automatic feeding and reducing manual operation. Conveying stage: Power source 43 drives the first link 44 to rotate, the first link 44 drives the action rod 45, and at the same time the second link 48 assists the action rod 45 to move. The transfer frame 41 is moved through the support rod 46. The actuating part 411 on the transfer frame 41 plays a limiting and pushing role on the sheet metal part 8, and the sheet metal part 8 is transferred to the designated position in sequence to ensure the stability and orderliness of the sheet metal part 8 transmission. Regularization stage: The first driving component 51 drives the linkage component 52, which in turn drives the third link 53 and the fourth link 54 to move, causing the first regularizing component 55 and the second regularizing component 56 to slide in the groove of the mounting platform 2. The rollers 552 on the first regularizing component 55 and the second regularizing component 56 contact the sheet metal part 8. The buffer reduces the impact on the sheet metal part 8. The torque sensor monitors the torque in real time during the regularization process to ensure that the sheet metal part 8 is accurately regularized to the appropriate position and posture, thereby improving the regularization accuracy of the sheet metal part 8. Pushing stage: The second driving component 611 drives the first lead screw 612 to rotate. The first lead screw 612 moves the first moving seat 62 through thread transmission. The support 63, the first guide post 631, the guide sleeve and the follower seat 64 on the first moving seat 62 work together. The guide wheel 66 slides in the slide rail 671 of the base plate 67, driving the pusher 65 to rise and move, accurately pushing the regulated sheet metal part 8 to the stop assembly 7, realizing the precise positioning and pushing of the sheet metal part 8. Material blocking stage: The third drive component 711 drives the second lead screw 712 to rotate, and the second lead screw 712 drives the second moving seat 72 to slide on the second guide post 713. The bracket 73 and the stop finger 74 on the second moving seat 72 move to the predetermined position. When the sheet metal part 8 is pushed over, the stop finger 74 blocks the sheet metal part 8, so that it accurately stops at the bending position, providing accurate positioning for subsequent bending operations. Bending stage: The control component controls the sliding plate 12 to slide on the frame 11 according to the preset program, which drives the upper mold 13 installed on the sliding plate 12 to move downward and cooperate with the lower mold 14 installed on the worktable 1 to apply pressure to the sheet metal part 8 located on the lower mold 14, thereby realizing the bending operation of the sheet metal part 8. Cyclic operation: After completing one bending operation, the control component controls each component to reset and repeats the above steps of feeding, conveying, straightening, pushing, blocking and bending to realize continuous processing of multiple sheet metal parts 8 and improve production efficiency.

[0070] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. An automatic push-limiting device for bending automotive sheet metal parts, comprising a worktable (1) and a frame (11) mounted on both sides of the worktable (1), wherein a sliding plate (12) is slidably disposed on the frame (11), and a plurality of upper molds (13) are detachably mounted on the sliding plate (12), and a lower mold (14) for placing and bending sheet metal parts (8) is mounted on the worktable (1), wherein the upper molds (13) act on the lower molds (14) to bend the sheet metal parts (8), characterized in that: The workbench (1) has a mounting platform (2) on one side and a material blocking component (7) on the other side. The mounting platform (2) is sequentially equipped with a feeding component (3), a conveying component (4), a straightening component (5) for straightening the sheet metal parts (8), and a pushing component (6). The conveying component (4) sequentially conveys several sheet metal parts (8) from the feeding component (3) to the end of the mounting platform (2) near the lower mold (14). The pushing component (6) pushes the sheet metal parts (8) straightened by the straightening component (5) to the end of the material blocking component (7).

2. The automatic push-limiting device for bending automotive sheet metal parts according to claim 1, characterized in that: The feeding assembly (3) includes a storage box (31) for stacking the sheet metal parts (8). The top and bottom of the storage box (31) are open. A conveyor frame (32) is provided on the placement platform (2). The storage box (31) is installed on the conveyor frame (32). A gap is provided between the bottom of the storage box (31) and the upper surface of the conveyor frame (32). The distance of the gap is greater than the thickness of one sheet metal part (8) and less than the thickness of two stacked sheet metal parts (8). A telescopic cylinder (33) is provided on the conveyor frame (32). The output end of the telescopic cylinder (33) is driven to connect to a feeding component (34). The feeding component (34) drives the sheet metal part (8) located on the upper surface of the conveyor frame (32) to move outside the storage box (31).

3. The automatic push-limiting device for bending automotive sheet metal parts according to claim 1, characterized in that: The conveying assembly (4) includes a transfer frame (41), on which a plurality of toggle pieces (411) are arranged. The mounting platform (2) is provided with a plurality of first bases (42) and second bases (47). A power source (43) is installed on one side of the first base (42), and a first connecting rod (44) is rotatably installed on the other side. The power source (43) drives the first connecting rod (44) to rotate. An action rod (45) is rotatably connected to the other end of the first connecting rod (44). A second connecting rod (48) is rotatably installed on the second base (47). The other end of the second connecting rod (48) is rotatably connected to the other end of the action rod (45). A support rod (46) is provided on the action rod (45). The other end of the support rod (46) is connected to the transfer frame (41) to drive a plurality of sheet metal parts (8).

4. The automatic push-limiting device for bending automotive sheet metal parts according to claim 2, characterized in that: The straightening component (5) includes a first drive member (51), which is mounted on the mounting platform (2). The output shaft of the first drive member (51) is fitted with a linkage member (52). One end of the linkage member (52) is rotatably connected to a third link (53), and the other end is rotatably connected to a fourth link (54). The other end of the third link (53) is rotatably connected to a first straightening member (55), and the other end of the fourth link (54) is rotatably connected to a second straightening member (56). The first straightening member (55) and the second straightening member (56) are both slidably disposed on the mounting platform (2). The conveyor frame (32) is located between the first straightening member (55) and the second straightening member (56) to straighten the sheet metal part (8).

5. The automatic push-limiting device for bending automotive sheet metal parts according to claim 4, characterized in that: The bottom of the first aligner (55) and the second aligner (56) are both equipped with sliders (551), the mounting platform (2) is provided with a sliding groove, the sliders (551) are slidably disposed in the sliding groove, and multiple rollers (552) are arranged on the first aligner (55) and the second aligner (56).

6. The automatic push-limiting device for bending automotive sheet metal parts according to claim 4, characterized in that: Torque sensors are provided on both the first alignment component (55) and the second alignment component (56).

7. The automatic push-limiting device for bending automotive sheet metal parts according to claim 1, characterized in that: The pushing component (6) includes a first mounting base (61), on which a second driving member (611) and a plurality of first lead screws (612) are mounted. The second driving member (611) drives the first lead screws (612) to rotate. A first movable seat (62) is threadedly connected to the plurality of first lead screws (612). A support (63) is provided on the first movable seat (62), and a first guide post (631) is provided on the support (63). 631) is fitted with a guide sleeve, the guide sleeve is connected to a follower seat (64), one end of the follower seat (64) is connected to a pusher (65), a guide wheel (66) is provided on one side of the follower seat (64), a base plate (67) is provided on one side of the first mounting seat (61), a slide rail (671) is provided on the base plate (67), the guide wheel (66) slides in the slide rail (671) to drive the pusher (65) to rise and move to the sheet metal part (8) to abut against the stop assembly (7).

8. The automatic push-limiting device for bending automotive sheet metal parts according to claim 1, characterized in that: The material blocking assembly (7) includes a second mounting base (71), which is mounted on the side of the frame (11) near the worktable (1). A third driving member (711), a second lead screw (712), and a second guide post (713) are mounted on the second mounting base (71). The third driving member (711) drives the second lead screw (712). A second movable seat (72) is threadedly connected to the second lead screw (712). The second movable seat (72) slides on the second guide post (713). A bracket (73) is mounted on the second movable seat (72). Several stop fingers (74) are mounted on the side of the bracket (73) near the lower mold (14).

9. The automatic push-limiting device for bending automotive sheet metal parts according to claim 1, characterized in that: It also includes a control component, which is electrically connected to the feeding component (3), the conveying component (4), the sizing component (5), the pushing component (6) and the blocking component (7), respectively.

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