A sheet metal bending device

Abstract

This utility model relates to the field of bending equipment technology, specifically disclosing a sheet metal bending device, including a table mechanism. A bending pushing mechanism is arranged in the middle of the table mechanism, and a bending shaping mechanism is arranged on one side of the table mechanism. The table mechanism includes a base, an operating table, and a sheet metal body. This solution uses cylinder one to adjust the height of the operating table to adapt to sheet metal bodies of different thicknesses, ensuring a tight fit with the bending mold. Cylinder two drives a limiting plate, and cylinder three controls a pressure plate, which work together to achieve precise positioning and clamping of the sheet metal before bending, effectively preventing offset or slippage during the bending process. The guide rail slide and cylinder four in the bending pushing mechanism can adjust the horizontal and vertical positions of the pushing bending plate, avoiding uneven local force during bending and ensuring the uniformity of the bent edge. The bending conveying limiting block is quickly limited by cylinder five, further ensuring the accuracy of the bending position, thereby significantly improving bending precision and finished product consistency.

Description

Technical Field

[0001] This utility model relates to the field of bending equipment technology, and specifically discloses a sheet metal bending equipment. Background Technology

[0002] Edge bending plays a crucial role in assembling enclosures, enhancing structural strength, connection stability, appearance quality, safety, and ease of assembly. Bending increases the rigidity and strength of the sheet metal, making the enclosure more robust and stable. Bending also allows the sheet metal to better withstand external pressure and impact, reducing the risk of deformation and damage.

[0003] Bending can also provide more connection points and surfaces, making the connection between sheets more robust and stable. For example, the utility model with authorization announcement number CN217798215U discloses a bending device for metal sheet processing, including a bracket and a hydraulic rod. A support plate is installed above the bracket, and a rear seat is installed above the support plate. The hydraulic rod is installed on the right side of the rear seat, and a bending knife is installed below the hydraulic rod. An adjustment mechanism is installed on the right side of the bending knife. This utility model uses a connecting seat fixed by a locking block, so that the connecting seat can be fixed inside the slide groove by the locking block, which facilitates the fixation of the position of the connecting seat and prevents the connecting seat from moving inside the device when the sheet is placed on top of the first connecting plate, which would prevent the sheet from being fixed inside the device. After adjusting the distance between the heightening pads, the locking block is fixed inside the device by tightening bolts, so that the angle between the first connecting plate and the second connecting plate is fixed. Then, the sheet to be processed is placed and bent.

[0004] Currently, when assembling the outer shell or inner liner of equipment using sheet metal, four or more sets of sheet metal are typically installed adjacently to form the outer shell or inner liner structure. However, if the sheet metal itself is thin, it directly results in the inability to directly install screws at the joints between adjacent sheet metal. If auxiliary connectors are added for installation, their presence may affect the installation space after the outer shell or inner liner is assembled. Therefore, for this type of sheet metal, the edges at the joints can be moderately bent to increase the splicing area at the joints, providing sufficient fixing area for screw assembly, thereby reducing the use of connectors. At the same time, the bent part can be a right angle or an inner angle with a radius greater than or equal to 90 degrees. Therefore, a bending device needs to be designed to meet the above requirements. Utility Model Content

[0005] In view of this, the purpose of this utility model is to provide a sheet metal bending device to solve the problem of combining and splicing box-shaped materials when the sheet metal is relatively thin. By bending the inner angle of the edge position to a degree greater than or equal to 90 degrees, the device can provide sufficient installation and fixing area for screws or bolts when splicing boxes together without adding connecting parts.

[0006] To achieve the above objectives, this utility model provides the following technical solution: a sheet metal bending device, including a table mechanism, a bending push mechanism is provided in the middle of the table mechanism, and a bending shaping mechanism is provided on one side of the table mechanism;

[0007] The platform mechanism includes a base, an operating table, and a plate body;

[0008] The bending and pushing mechanism includes a concave channel, a guide rail pair, a guide rail pair slide, and a pushing and bending plate;

[0009] The bending and shaping mechanism includes a second concave channel, a first bending die, and a second bending die.

[0010] Furthermore, an operating platform is provided above the base, and cylinders are distributed at the four corners of the lower end of the operating platform. The lower end of cylinders is located at the upper end of the base. A piston rod for extension and retraction is provided inside cylinders. The end of piston rod is installed at the connection of the operating platform, and the connection between piston rod and operating platform is fixed with screws. A plate body is placed above the operating platform, and symmetrically distributed cylinders are provided above the operating platform. A piston rod for extension and retraction is provided inside cylinders. A limit plate is provided at the end of piston rod. The side of the limit plate away from cylinder is in contact with the side of the plate body.

[0011] Furthermore, one side of the operating table is provided with columns distributed at both ends, and the upper ends of the two columns distributed on both sides are provided with the same top plate. Several cylinders are arranged longitudinally and parallelly on the surface of the top plate. The cylinders are provided with piston rods for extension and retraction inside. The ends of the several piston rods distributed in the same row are jointly installed with the same pressure plate. The lower end of the pressure plate is pressed against the plate body.

[0012] Furthermore, the concave channel one is located in the middle of the base, and a guide rail sub-guide rail is provided inside the concave channel one. A guide rail sub-slide is slidably provided on the surface of the guide rail sub-guide rail. The same movable plate is provided on the upper end of the guide rail sub-slides distributed on both sides. A cylinder four is provided above the movable plate. A piston rod four for extension and retraction is provided inside the cylinder four.

[0013] Furthermore, the piston rod of the fourth cylinder is provided with a connecting plate at its fourth end, and a pushing bending plate is provided above the connecting plate. Reinforcing strips are provided on both sides of the pushing bending plate.

[0014] Furthermore, a cylinder five is provided on the side of the push bending plate away from the operating table. Inside the cylinder five is a piston rod five for extension and retraction. A bending conveying restriction block is provided at the end of the piston rod five. The end of the bending conveying restriction block has an arc surface structure.

[0015] Furthermore, the concave channel 2 is located at the end of the base away from the operating table. A cylinder 6 is installed inside the concave channel 2. A piston rod 6 for extension and retraction is installed inside the cylinder 6. A transition frame is installed above the piston rod 6. A bearing is installed at the upper end of the transition frame. The bearings distributed on both sides are connected by the same shaft. The surface of the shaft is interference-fitted with the inner ring wall of any bearing. A center sleeve is installed through and sleeved on the surface of the shaft.

[0016] The outer ring wall of the central sleeve is provided with mold frame one and mold frame two on both sides. Mold frame one and mold frame two are both rectangular hollow frame structures. The surface of mold frame one is covered with bending mold one, which is a cylindrical structure. The surface of mold frame two is covered with bending mold two, which is a cylindrical structure with a square cross section.

[0017] Furthermore, a positioning sleeve is fixed to the surface of the transition frame located on one side by a bracket. A positioning pin is slidably sleeved inside the positioning sleeve. A spring is wound around the surface of the positioning pin. The two ends of the spring are fixedly assembled with the end face of the positioning sleeve and the end of the positioning pin, respectively. Two symmetrical positioning seats are distributed on the surface of the shaft corresponding to the positioning sleeve. The end of the positioning pin away from the spring is inserted and docked with the corresponding positioning seat.

[0018] The working principle and beneficial effects of this solution are as follows: 1. This solution adjusts the height of the operating table using cylinder one to adapt it to plates of different thicknesses, ensuring a tight fit with the bending die; the limiting plate driven by cylinder two and the pressure plate controlled by cylinder three work together to achieve precise positioning and clamping of the plate before bending, effectively preventing offset or slippage during the bending process; the guide rail slide and cylinder four in the bending push mechanism can adjust the horizontal and vertical positions of the pushing bending plate to avoid uneven local force during bending and ensure the uniformity of the bending edge; the bending conveying limiting block is quickly limited by cylinder five, further ensuring the accuracy of the bending position, thereby significantly improving bending accuracy and product consistency;

[0019] 2. As described in point 1, the bending and shaping mechanism adopts a dual-mold design. Bending mold one (cylindrical) and bending mold two (square) are used for processing arc-shaped inner corners and right-angled inner corners, respectively. Through the lifting shaft of cylinder six and the cooperation of spring and positioning pin, the molds can be quickly switched without disassembling or replacing parts. The plug-in structure of the positioning seat and positioning pin ensures the stability after mold switching and avoids displacement during processing. This design greatly improves the versatility of the equipment, adapts to diverse bending needs, reduces downtime for adjustment, and improves production efficiency.

[0020] Other advantages, objectives, and features of this invention will be set forth in part in the description which follows, and in part will be apparent to those skilled in the art from the following examination and study, or may be learned from practice of this invention. The objectives and other advantages of this invention can be realized and obtained through the following description. Attached Figure Description

[0021] Figure 1 This is a schematic diagram showing the distribution of the various mechanisms in the embodiment;

[0022] Figure 2 This is a schematic diagram of the overall front structure of the embodiment;

[0023] Figure 3 This is a schematic diagram of the overall top view of the mechanism in the embodiment;

[0024] Figure 4 This is an enlarged schematic diagram of point A in the embodiment;

[0025] Figure 5 This is a schematic diagram of the bending and propulsion mechanism in an embodiment;

[0026] Figure 6 This is a schematic diagram of the bending and shaping mechanism in an embodiment.

[0027] The following are labeled in the attached diagram: 1. Tabletop mechanism; 2. Bending and pushing mechanism; 3. Bending and shaping mechanism; 10. Base; 11. Cylinder 1; 12. Operating table; 13. Plate body; 14. Cylinder 2; 15. Limiting plate; 16. Column; 17. Top plate; 18. Cylinder 3; 19. Pressure plate; 20. Guide rail pair guide rail; 21. Guide rail pair slide; 22. Moving plate; 23. Cylinder 4; 24. Connecting plate; 25. Pushing and bending plate; 26. Reinforcing strip; 27. Recessed channel one; 2001. Cylinder five; 2002. Bending conveyor limiting block; 30. Recessed channel two; 31. Cylinder six; 32. Transition frame; 33. Bearing; 34. Shaft; 35. Center sleeve; 36. Die frame one; 37. Bending die one; 38. Die frame two; 39. Bending die two; 3001. Positioning sleeve; 3002. Positioning pin; 3003. Spring; 3004. Positioning seat. Detailed Implementation

[0028] The following detailed description illustrates the specific implementation methods:

[0029] Example

[0030] like Figures 1 to 6As shown, a sheet metal bending device is disclosed, including a table mechanism 1, a bending push mechanism 2 is provided in the middle of the table mechanism 1, and a bending shaping mechanism 3 is provided on one side of the table mechanism 1.

[0031] The tabletop mechanism 1 includes a base 10, an operating table 12, and a plate body 13;

[0032] The bending and pushing mechanism 2 includes a concave channel 27, a guide rail pair 20, a guide rail pair slide 21, and a pushing and bending plate 25;

[0033] The bending and shaping mechanism 3 includes a concave channel 2 30, a bending die 1 37, and a bending die 2 39.

[0034] An operating platform 12 is provided above the base 10. Cylinders 11 are distributed at the four corners of the lower end of the operating platform 12. The lower ends of the cylinders 11 are located on the upper end of the base 10 and are fixed to the surface of the base 10 with screws. A piston rod for extension and retraction is provided inside the cylinders 11. The end of the piston rod is installed at the connection point of the operating platform 12, and the connection point is fixed with screws. The extension and retraction of the piston rod of the cylinders 11 allows for the raising and lowering adjustment of the operating platform 12. This adjustment can be tailored to the thickness of the sheet metal body 13, ensuring stable contact with the lower end of the bending die. The upper part of the operating platform 12... A plate body 13 is placed on a square surface. Above the operating table 12, there are symmetrically distributed cylinders 14. The lower end of the outer wall of the cylinders 14 is fixedly installed to the side of the operating table 12 via a bracket. Inside the cylinders 14, there is a piston rod 2 for telescopic movement. The end of the piston rod 2 is provided with a limit plate 15. The connection between the limit plate 15 and the piston rod 2 is fixed by screws. The side of the limit plate 15 away from the cylinders 14 contacts the side of the plate body 13. By telescopic movement of the piston rods of the two opposing cylinders 14, the distance between the two limit plates 15 can be adjusted so that it can limit the plate body 13 when it is bent, and prevent it from tilting.

[0035] One side of the operating table 12 has columns 16 distributed at both ends. The lower ends of the columns 16 are fixed to the surface of the operating table 12 with screws. The upper ends of the two columns 16 distributed on both sides are provided with the same top plate 17. The connection between the top plate 17 and the columns 16 is assembled by welding. Several cylinders 18 are arranged longitudinally and parallelly on the surface of the top plate 17. The connection between the cylinders 18 and the top plate 17 is fixed with screws. The cylinders 18 have piston rods 3 for extension and retraction inside. The ends of the several piston rods 3 distributed in the same row are jointly installed with... The upper end of the same pressure plate 19 is fixed to the end of any piston rod 3 by screws, and the lower end of the pressure plate 19 is pressed against the plate body 13. When the plate body 13 needs to be bent and its position is fixed, the plate body 13 is moved to the designated position, and the piston rod 3 of the cylinder 3 18 extends, so that the pressure plate 19 can move downward and contact the plate body 13. With the cooperation of the operating table 12, the plate body 13 can be positioned, pressed and fixed, thus ensuring that the plate body 13 will not slide during bending and ensuring the bending quality.

[0036] A recessed channel 27 is located in the middle of the base 10. A guide rail sub-guide 20 is installed inside the recessed channel 27. The lower end of the guide rail sub-guide 20 is fixed to the bottom end of the recessed channel 27 with screws. The guide rail sub-guide 20s are symmetrically distributed along the interior of the recessed channel 27. Guide rail sub-slide seats 21 are slidably mounted on the surface of the guide rail sub-guide 20. A common movable plate 22 is mounted on the upper end of the guide rail sub-slide seats 21 distributed on both sides. The movable plate 22 is fixed to any one of the guide rail sub-slide seats 21 with screws. A cylinder 23 is mounted above the movable plate 22. The lower end of the cylinder 23 is fixed to the movable plate 22 with screws. The cylinder 23 has a... Before bending the plate body 13 based on the corresponding bending die by pushing the bending plate 25, the piston rod 4 of cylinder 4 23 extends and retracts to adjust the height of the bending plate 25 according to the thickness and height position of the plate body 13. At the same time, in the horizontal direction, the guide rail slide 21 can slide on the guide rail 20 to adjust the horizontal position, ensuring that the bending plate 25 is not obstructed by the bending die when bending the edge of the plate body 13, and that the plate body 13 is not subjected to local extrusion deformation during the bending process, only ensuring that the edge of the plate body 13 can be bent normally.

[0037] The piston rod of cylinder 4 23 is provided with a connecting plate 24 at its end. The connecting plate 24 is fixed to the end of the piston rod by screws. A pushing bending plate 25 is provided above the connecting plate 24. The pushing bending plate 25 is fixed to the connecting plate 24 by welding. Reinforcing strips 26 are provided on both sides of the pushing bending plate 25. The reinforcing strips 26 are fixed to the pushing bending plate 25 and the connecting plate 24 by welding. When the pushing bending plate 25 is bent and pushed, in order to ensure that the lower end of the pushing bending plate 25 will not deform or crack during long-term use, the reinforcing strips 26 can further improve the installation stability of the pushing bending plate 25 and the connecting plate 24.

[0038] A cylinder 2001 is installed on the side of the bending plate 25 away from the operating table 12. The outer wall of the cylinder 2001 is fixedly installed on the surface of the bending plate 25 via a bracket. Inside the cylinder 2001, there is a piston rod 5 for telescopic movement. At the end of the piston rod 5, there is a bending conveying restriction block 2002. The end of the bending conveying restriction block 2002 has an arc-shaped structure and is in contact with the end face of the plate body 13. When the plate body 13 is being conveyed and the bending position is determined, the position of the bending conveying restriction block 2002 can be adjusted by telescopic movement of the piston rod 5 of the cylinder 2001. This allows the bending position to be quickly limited and determined when the plate body 13 is being conveyed to the bending position. After determination, the plate body 13 is pressed down and fixed by the pressure plate 19. Then, the piston rod 5 of the cylinder 2001 retracts, allowing the bending conveying restriction block 2002 to be removed, thus avoiding affecting the bending process of the edge of the plate body 13.

[0039] A concave channel 2 30 is located at the end of the base 10 away from the operating table 12. A cylinder 6 31 is installed inside the concave channel 2 30. The lower end of the cylinder 6 31 is fixed to the interior of the concave channel 2 30 by screws. The cylinders 6 31 are symmetrically distributed along both sides of the concave channel 2 30. A piston rod 6 for extension and retraction is installed inside the cylinder 6 31. A transition frame 32 is installed above the piston rod 6. The connection between the transition frame 32 and the piston rod 6 is fixed by screws. A bearing 33 is installed at the upper end of the transition frame 32. The outer ring wall of the bearing 33 is fixed to the transition frame 32 by welding. A common shaft 34 is installed through the interior of the bearings 33 distributed along both sides. The surface of the shaft 34 is interference-fitted with the inner ring wall of any bearing 33. A center sleeve 35 is installed through and fitted onto the surface of the shaft 34. The connection between the center sleeve 35 and the shaft 34 is fixed by screws. Mold holders 1 3 are respectively installed on both sides of the outer ring wall of the center sleeve 35. 6 and mold frame 2 38, mold frame 1 36 and mold frame 2 38 are respectively fixed to the connection position of the central sleeve 35 by welding. Mold frame 1 36 and mold frame 2 38 are both rectangular hollow frame structures. The surface of mold frame 1 36 is covered with bending mold 1 37. Bending mold 1 37 is a cylindrical structure, and the connection position of bending mold 1 37 and mold frame 1 36 is fixed by welding. The surface of mold frame 2 38 is covered with bending mold 2 39. Bending mold 2 39 is a column structure with a square cross section, and the connection position of bending mold 2 39 and mold frame 2 38 is fixed by welding. Bending mold 1 37 can bend the plate body 13 with an arc-shaped inner angle, and bending mold 2 39 can bend the plate body 13 with a right-angled inner angle. When it is necessary to switch between bending mold 1 37 and bending mold 2 39, the piston rod 6 of cylinder 6 31 can be extended to raise the shaft 34 part as a whole, so as to rotate and switch the two bending molds.

[0040] A positioning sleeve 3001 is fixed to the surface of a transition frame 32 located on one side via a bracket. A positioning pin 3002 is slidably fitted inside the positioning sleeve 3001. A spring 3003 is wound around the surface of the positioning pin 3002. The two ends of the spring 3003 are fixedly assembled to the end face of the positioning sleeve 3001 and the end of the positioning pin 3002, respectively. Two symmetrical positioning seats 3004 are distributed on the surface of the shaft 34 corresponding to the positioning sleeve 3001. The connection position of the positioning seats 3004 and the shaft 34 is fixed by screws. The end of the positioning pin 3002 away from the spring 3003 is inserted into the corresponding positioning seat 3004. Next, when it is necessary to switch between two bending dies, the piston rod of cylinder 6 31 is extended to raise the whole structure. Then, the positioning pin 3002 is pulled. Through the stretching effect of spring 3003, the positioning pin 3002 is disengaged from the current positioning seat 3004, allowing the shaft 34 to rotate based on bearing 33, thus switching the positions of the two bending dies. When the new positioning seat 3004 corresponds to the position of the positioning pin 3002, the spring 3003 resets the positioning pin 3002 to insert and engage with the inside of the new positioning seat 3004, thus fixing the two bending dies after switching.

[0041] In practice

[0042] Before bending, the sheet body 13 needs to be precisely positioned and clamped. The operating table 12 is adjusted by extending and retracting the piston rod of cylinder 11 to accommodate sheets of different thicknesses. After the sheet body 13 is placed on the operating table 12, cylinders 14 symmetrically distributed on both sides push the limiting plate 15 through the piston rod to achieve lateral limiting of the sheet and prevent the sheet from shifting during bending. At the same time, cylinder 18 on the top plate 17 drives the piston rod to press down, causing the pressure plate 19 to come into close contact with the sheet body 13, forming an upper and lower clamping force with the operating table 12 to ensure that the sheet does not slip during bending. In addition, cylinder 2001 on the side of the bending plate 25 adjusts the position of the bending conveying limiting block 2002 through the piston rod to quickly position the bending start point of the sheet. After positioning, the pressure plate 19 clamps the sheet, and the bending conveying limiting block 2002 retracts to avoid interfering with subsequent bending actions.

[0043] The bending and pushing mechanism 2 achieves horizontal position adjustment of the moving plate 22 through the sliding cooperation of the guide rail 20 and the guide rail slide 21 to adapt to plates of different sizes. The piston rod of cylinder 4 23 can extend and retract to adjust the height of the pushing bending plate 25 to ensure accurate contact position with the edge of the plate. The pushing bending plate 25 has high rigidity under the support of the reinforcing strip 26 and can withstand the reaction force during bending without deformation. During bending, the moving plate 22 moves horizontally along the guide rail 20, pushing the pushing bending plate 25 to squeeze the edge of the plate body 13, making it bend towards the bending die. The first bending die 37 (cylindrical) is used to form an arc-shaped inner angle, while the second bending die 39 (square cross section) is used to form a right-angled inner angle. The working position of the two dies can be switched by the lifting and lowering of the piston rod of cylinder 6 31. The insertion and cooperation of the positioning pin 3002 and the positioning seat 3004 ensures the stability after the die is switched.

[0044] The bending and shaping mechanism 3 switches the bending die by raising and lowering the piston rod of cylinder 31. When the die needs to be changed, the piston rod extends, lifting the transition frame 32, shaft 34 and the die as a whole, away from the working position. Then, the operator pulls the positioning pin 3002 to separate it from the current positioning seat 3004. The spring 3003 is stretched. At this time, the shaft 34 can rotate freely under the support of the bearing 33, driving the die holder 1 36 and die holder 2 38 to switch positions. When the target die (such as bending die 2 39) rotates to the working position, the restoring force of the spring 3003 pushes the positioning pin 3002 to insert into the hole of the corresponding positioning seat 3004, completing the die fixing. Finally, the piston rod of cylinder 31 retracts, lowering the die to the working height. This design achieves fast and stable die switching, meets the needs of different bending processes, and avoids the tedious operation of manually disassembling the die, thus improving production efficiency.

[0045] The above description is merely an embodiment of this utility model, and common knowledge such as specific structures and characteristics in the solution is not described in detail here. It should be noted that those skilled in the art can make several modifications and improvements without departing from the structure of this utility model, and these should also be considered within the protection scope of this utility model. These modifications and improvements will not affect the effectiveness of the implementation of this utility model or its practicality.

Claims

1. A sheet metal bending device, characterized in that: It includes a tabletop mechanism, a bending and pushing mechanism is provided in the middle of the tabletop mechanism, and a bending and shaping mechanism is provided on one side of the tabletop mechanism; The platform mechanism includes a base, an operating table, and a plate body; The bending and pushing mechanism includes a concave channel, a guide rail pair, a guide rail pair slide, and a pushing and bending plate; The bending and shaping mechanism includes a second concave channel, a first bending die, and a second bending die.

2. The sheet metal bending equipment according to claim 1, characterized in that: An operating platform is provided above the base. Cylinder 1 is distributed at the four corners of the lower end of the operating platform. The lower end of cylinder 1 is located at the upper end of the base. Cylinder 1 has a piston rod 1 for extension and retraction inside. The end of piston rod 1 is installed at the connection of the operating platform. The connection between piston rod 1 and operating platform is fixed with screws. Plate body is placed above the operating platform. Cylinder 2 is symmetrically distributed above the operating platform. Cylinder 2 has a piston rod 2 for extension and retraction inside. Limit plate is provided at the end of piston rod 2. The side of limit plate away from cylinder 2 is in contact with the side of plate body.

3. The sheet metal bending equipment according to claim 2, characterized in that: One side of the operating table is provided with columns distributed at both ends. The upper ends of the two columns distributed on both sides are provided with the same top plate. Several cylinders are arranged longitudinally and parallelly on the surface of the top plate. The cylinders are provided with piston rods for extension and retraction. The ends of the several piston rods distributed in the same row are installed with the same pressure plate. The lower end of the pressure plate is pressed against the plate body.

4. The sheet metal bending equipment according to claim 3, characterized in that: The concave channel one is located in the middle of the base. Inside the concave channel one, there is a guide rail sub-guide rail. A guide rail sub-slide is slidably mounted on the surface of the guide rail sub-guide rail. The upper end of the guide rail sub-slides distributed on both sides is provided with the same movable plate. Above the movable plate, there is a cylinder four. Inside the cylinder four, there is a piston rod four for extension and retraction.

5. The sheet metal bending equipment according to claim 4, characterized in that: The piston rod of the cylinder four is provided with a connecting plate at its four ends, and a pushing bending plate is provided above the connecting plate. Reinforcing strips are provided on both sides of the pushing bending plate.

6. The sheet metal bending equipment according to claim 5, characterized in that: A cylinder five is provided on the side of the push bending plate away from the operating table. Inside the cylinder five is a piston rod five for extension and retraction. A bending conveying restriction block is provided at the end of the piston rod five. The end of the bending conveying restriction block has an arc surface structure.

7. A sheet metal bending device according to claim 6, characterized in that: The concave channel 2 is located at the end of the base away from the operating table. The concave channel 2 is equipped with a cylinder 6, and the cylinder 6 is equipped with a piston rod 6 for extension and retraction. A transition frame is located above the piston rod 6, and a bearing is located at the upper end of the transition frame. The bearings distributed on both sides are connected by the same shaft. The surface of the shaft is interference-fitted with the inner ring wall of any bearing. A center sleeve is installed through and sleeved on the surface of the shaft. The outer ring wall of the central sleeve is provided with mold frame one and mold frame two on both sides. Mold frame one and mold frame two are both rectangular hollow frame structures. The surface of mold frame one is covered with bending mold one, which is a cylindrical structure. The surface of mold frame two is covered with bending mold two, which is a cylindrical structure with a square cross section.

8. A sheet metal bending device according to claim 7, characterized in that: A positioning sleeve is fixed to the surface of the transition frame located on one side by a bracket. A positioning pin is slidably connected inside the positioning sleeve. A spring is wound around the surface of the positioning pin. The two ends of the spring are fixedly assembled to the end face of the positioning sleeve and the end of the positioning pin, respectively. Two symmetrical positioning seats are distributed on the surface of the shaft corresponding to the positioning sleeve. The end of the positioning pin away from the spring is inserted and connected to the corresponding positioning seat.

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