Sheet metal part clamping structure and sheet metal part bending machine thereof

Abstract

The invention relates to the field of sheet metal part bending machines, and particularly discloses a sheet metal part clamping structure and a sheet metal part bending machine thereof.The sheet metal part clamping structure comprises two swing assemblies driving sheet metal parts to be turned up in the bending process and a rotating assembly controlling the sheet metal parts to rotate by 90 degrees, the two swing assemblies are symmetrically arranged, and the rotating assembly is arranged between the two swing assemblies; the sheet metal part is fixed to the rotating assembly, and the rotating assembly can slide along the swing assembly to control the bending position of the sheet metal part. In the bending process, the swing assembly drives the sheet metal part to be turned upwards with the bent part as the circle center, so that the bending precision is guaranteed, meanwhile, after one edge is bent, the sheet metal part can be rotated to the to-be-bent edge on the lower side through the rotating assembly, bending operation of the cabinet sheet metal part is achieved in the reciprocating mode, the bending precision is guaranteed, and the bending efficiency is improved. The sheet metal part clamping structure is used for replacing an operator to turn up the sheet metal part, so that the sheet metal part is prevented from colliding with the operator in the turning-up process, and the operation safety of the operator is ensured.

Description

Technical Field

[0001] The present invention relates to the field of sheet metal bending machines, and specifically to a clamping structure for sheet metal parts and a sheet metal bending machine therefor. Background Art

[0002] Existing chassis or cabinets are mainly formed by bending sheet metal parts. The formed cabinet is hollow in the middle, and the bending operation of sheet metal parts needs to be realized by a bending machine. When bending some cabinet sheet metal parts, since the area of the cabinet sheet metal parts is large, it is necessary for multiple people to lift the sheet metal parts to the bending machine, and multiple people cooperate to place the sheet metal parts at the position to be bent and align them with the bending head of the bending machine, and then the bending machine is started for bending operation. During this process, some problems are likely to occur. Firstly, when aligning the bending position of the cabinet sheet metal parts, since the bending accuracy of the sheet metal parts is affected by the cooperation of the operators, the accuracy control of the bending of the sheet metal parts is not ideal. Secondly, since the cabinet sheet metal parts need to be turned up with the bending part as the center during bending, during this process, due to the large area of the cabinet sheet metal parts, it is easy to pose a certain safety hazard to the operators when it is turned up. Summary of the Invention

[0003] The purpose of the present invention is to provide a clamping structure for sheet metal parts and a sheet metal bending machine therefor, which are used to overcome the above-mentioned defects in the prior art.

[0004] According to a clamping structure for sheet metal parts of the present invention, it includes two swing components that drive the sheet metal parts to turn up during the bending process and a rotation component that controls the sheet metal parts to rotate by 90 degrees. The two swing components are symmetrically arranged, the rotation component is arranged between the two swing components, the sheet metal parts are fixed on the rotation component, and the rotation component can slide along the swing component to control the bending position of the sheet metal parts.

[0005] Through the above technical solution, the rotation component fixes the sheet metal parts, and as the rotation component moves along the swing component, it can drive the position of the sheet metal parts to be bent into the bending machine. During the bending process, the swing component drives the sheet metal parts to turn up with the bending part as the center of the circle, so as to ensure the bending accuracy. At the same time, after one side is bent, the rotation component can rotate the sheet metal parts to the next side edge to be bent, and so on to realize the bending operation of the cabinet sheet metal parts, so that the sheet metal is bent to form a cabinet with a hollow middle, ensuring the bending accuracy.

[0006] The present invention is further configured as: the swing component includes a rotating disk, a guide rod, and a lead screw. The guide rod is fixed on the outer periphery of the rotating disk, and one end of the lead screw close to the rotating disk is rotatably connected to the inner part of the outer periphery of the rotating disk. The guide rod and the lead screw are arranged in parallel.

[0007] Through the above technical solution, the rotation of the rotating disk drives the guide rod and the lead screw to rotate around the axis of the rotating disk, and further drives the rotation component to turn over around the axis of the rotating disk.

[0008] The present invention is further configured such that: worm wheels are rotatably provided on the end faces of the two rotating disks facing away from each other. Worms are engaged with the lower sides of the two worm wheels. A rotating shaft located at the center of the circle is fixedly provided on the end face of the worm wheel close to the rotating disk. A connection hole is formed at the center of the rotating disk, and the rotating shaft is rotatably connected to the corresponding connection hole. An arc-shaped groove located outside the connection hole and communicating with the connection hole is formed in the rotating disk. A limiting block is fixedly provided on the outer periphery of the rotating shaft, and the limiting block is slidably connected to the arc-shaped groove on the corresponding side.

[0009] Through the above technical solution, the rotation of the worm drives the rotation of the worm wheel, and further causes the rotating disk to rotate around the rotating shaft. By using the sliding of the limiting block in the arc-shaped groove, a certain movement margin is provided during the bending process of the cabinet sheet metal part, reducing other deformations of the sheet metal part during the bending process except for bending.

[0010] The present invention is further configured such that: the arc length of the outer peripheral wall of the arc-shaped groove is three-quarters of a circular arc, the arc length of the outer periphery of the limiting block is one-quarter of a circular arc, and the limiting block can rotate 90 degrees around the rotating shaft in the arc-shaped groove.

[0011] Through the above technical solution, the limiting block can rotate within an angle range of zero to 90 degrees around the rotating shaft in the arc-shaped groove, thereby ensuring that the rotation range of the swing assembly meets the movement range during the bending process of the sheet metal part.

[0012] The present invention is further configured such that: the rotating assembly includes an electromagnet and a mounting bracket for mounting the electromagnet. Sliding seats are provided at both ends of the mounting bracket. A guiding rod passes through the sliding seats and is slidably connected to them. A threaded block is fixed to the lower end face of the sliding seat, and a lead screw passes through the threaded block and is threadedly connected to it. The mounting bracket can slide along the guiding rod with the sliding seats.

[0013] Through the above technical solution, when the lead screw rotates, the threaded block slides along it, thereby driving the sliding seat to slide along the guiding rod, and further causing the mounting bracket to slide along the guiding rod with the sliding seat. At the same time, by using the self-locking effect between the threaded block and the lead screw, it is ensured that when the lead screw stops rotating, the threaded block can remain stationary on the lead screw.

[0014] The present invention is further configured such that: the mounting bracket includes a mounting seat, a sleeve rod, and two symmetrically arranged connecting brackets. The electromagnet is rotatably connected to the mounting seat. A servo motor is fixed to the lower end face of the mounting seat, and the electromagnet is fixed to the output shaft of the servo motor. The two connecting brackets are both fixed on the outer periphery of the mounting seat. The two sleeve rods are respectively fixed to the ends of the two connecting brackets away from the mounting seat, and the two sleeve rods can slide together with the two sliding seats.

[0015] Through the above technical solution, after the electromagnet is powered on, it can attract and fix the sheet metal part, and the servo motor can drive the electromagnet to rotate by ninety degrees.

[0016] The present invention is further configured as follows: A connecting rod is fixed between the ends of the two guide rods away from the rotating disk, the ends of the two lead screws away from the rotating disk both penetrate through the connecting rod, two stepper motors are fixed on the connecting rod, and the two lead screws are respectively fixed on the output shafts of the two stepper motors.

[0017] Through the above technical solution, the stepper motor drives the lead screw to rotate, which can precisely control the displacement distance of the threaded block.

[0018] The present invention is further configured as follows: Sliding grooves are respectively formed in the two sleeve rods, the ends of the sliding grooves away from the rotating disk and away from the mounting seat are both open, sliding rods are fixedly arranged on the side faces of the two sliding seats close to the sleeve rods, the two sliding rods are respectively slidably connected in the two sliding grooves, and springs are fixed between the ends of the sliding rods close to the rotating disk and the side walls of the corresponding sliding grooves close to the rotating disk.

[0019] Through the above technical solution, the sleeve rod can slide along the sliding rod. By using the elastic force of the spring, when the sliding seat slides along the guide rod, the sleeve rod can be driven to slide together. When the sheet metal part is bent, relative displacement can occur between the sleeve rod and the sliding rod, so that there is a certain movement distance when the sheet metal part is bent.

[0020] The present invention is further configured as follows: A protective shell is arranged outside the worm gear, a connecting shaft is fixed on the end face of the worm gear away from the rotating disk, the connecting shaft is rotatably connected in the protective shell, the worm gear, the worm and the rotating disk are all located in the protective shell, both ends of the worm are rotatably connected in the protective shell, a motor is fixed on the outer side face of the protective shell, the worm is fixed on the output shaft of the motor, a through groove is formed in the protective shell, and the guide rod and the lead screw both penetrate through the through groove and can rotate by ninety degrees around the connecting shaft in the through groove.

[0021] Through the above technical solution, the motor drives the worm to rotate, which can make the worm gear rotate around the connecting shaft, thereby driving the swinging assembly to turn the sheet metal part upwards, so as to ensure the smooth progress of the bending process.

[0022] The present invention also provides a sheet metal bender, which includes the above sheet metal clamping structure, a frame, an upper die and a lower die. The sheet metal clamping structure is detachably installed on the frame. The upper end face of the electromagnet is flush with the upper end face of the lower die. The two protective shells in the sheet metal clamping structure are respectively fixed on the two side end faces of the frame by bolts. The initial positions of the guide rod and the lead screw are in a horizontal state.

[0023] Through the above technical solution, the sheet metal part is fixed on the sheet metal part clamping structure. Driven by the sheet metal part clamping structure, the edge to be folded of the sheet metal part moves between the upper die and the lower die. The lower die supports the edge to be folded of the sheet metal part, and the upper die presses down the sheet metal part, thereby realizing the bending operation of the sheet metal part.

[0024] The beneficial effects of the present invention are as follows: The rotating component in the sheet metal part clamping structure fixes the sheet metal part. As the rotating component drives along the swinging component, the position to be bent of the sheet metal part can be moved between the upper die and the lower die. The lower die abuts against the lower side of the sheet metal part, and the upper die presses down to bend the sheet metal part. During the bending process, the swinging component drives the sheet metal part to turn up with the bending part as the center of the circle, thereby ensuring the bending accuracy. At the same time, after one side is folded, the sheet metal part can be rotated to the next edge to be folded through the rotating component. In this way, the bending operation of the cabinet body sheet metal part is realized repeatedly, making it form a cabinet body with a hollow center, ensuring the bending accuracy, using the sheet metal part clamping structure to replace the operator for the turning-up operation of the sheet metal part, avoiding the sheet metal part from bumping into the operator during the turning-up process, and ensuring the operation safety of the operator. Brief Description of the Drawings

[0025] Figure 1 is the structural schematic diagram of the present invention; Figure 2 is the structural schematic diagram of the sheet metal part clamping structure in the present invention; Figure 3 is the present invention Figure 2 the enlarged schematic diagram at A in; Figure 4 is the present invention Figure 2 the enlarged schematic diagram at B in; Figure 5 is the structural schematic diagram of the limit block in the present invention; Figure 6 is the structural schematic diagram of the arc groove in the present invention; Figure 7 is the exploded schematic diagram of the mounting bracket in the present invention.

[0026] In the figure: 10, frame; 11, upper die; 12, lower die; 20, protective shell; 21, worm gear; 22, worm; 23, limit block; 24, rotating shaft; 25, through groove; 26, connecting shaft; 30, sliding seat; 301, arc groove; 302, connecting hole; 3011, first limiting surface; 3012, second limiting surface; 31, sleeve rod; 32, guide rod; 33, lead screw; 34, rotating disc; 35, connecting rod; 36, threaded block; 37, slide bar; 38, spring; 39, chute; 40, electromagnet; 41, mounting seat; 42, connecting frame. Detailed Embodiments

[0027] In the description of the present invention, it should be understood that the orientation or positional relationships indicated by the terms "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. are based on the Figure 1 orientation or positional relationship shown, and are only for the convenience of simplifying the description of the present invention, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as a limitation to the present invention.

[0028] In order to make the purpose and advantages of the present invention more clear, the following specifically describes the present invention in conjunction with embodiments. It should be understood that the following text is only used to describe one or several specific implementation manners of the present invention, and does not strictly limit the scope of protection of the specific claims of the present invention. As used herein, the terms "upper and lower" and "left and right" are not limited to their strict geometric definitions, but include tolerances for machining or human errors that are reasonable and inconsistent. The specific features of a sheet metal clamping structure and a sheet metal bending machine thereof are described in detail below: An embodiment of the present invention: Referring to Figures 1 - 7 , the present invention provides a sheet metal clamping structure and a sheet metal bending machine thereof, including two swing components that drive the sheet metal to turn up during the bending process and a rotating component that controls the sheet metal to rotate 90 degrees. The two swing components are symmetrically arranged, the rotating component is arranged between the two swing components, the sheet metal is fixed on the rotating component, and the rotating component can slide along the swing component to control the bending position of the sheet metal.

[0029] Referring to Figures 2 - 6 , the swing component includes a rotating disk 34, a guide rod 32, and a lead screw 33. The guide rod 32 is fixed on the outer periphery of the rotating disk 34. One end of the lead screw 33 close to the rotating disk 34 is rotatably connected to the inner periphery of the outer side of the rotating disk 34. The guide rod 32 and the lead screw 33 are arranged in parallel. Worm gears 21 are rotatably arranged on the end faces of the two rotating disks 34 away from each other. Worm gears 22 are engaged with the lower sides of the two worm gears 21. A rotating shaft 24 located at its center is fixedly provided on the end face of the worm gear 21 close to the rotating disk 34. A connection hole 302 is opened at the center of the rotating disk 34. The rotating shaft 24 is rotatably connected to the corresponding connection hole 302. An arc-shaped groove 301 located outside the connection hole 302 and communicating with the connection hole 302 is opened in the rotating disk 34. The limiting block 23 is slidably connected to the corresponding arc-shaped groove 301.

[0030] Referring to Figure 4 , Figure 5 , Figure 6, the arc length of the outer peripheral wall of the arc-shaped groove 301 is three-quarters of a circular arc, the arc length of the outer periphery of the limiting block 23 is one-quarter of a circular arc, the limiting block 23 can rotate 90 degrees around the rotating shaft 24 within the arc-shaped groove 301. The side walls at both ends of the arc-shaped groove 301 are respectively the first limiting surface 3011 and the second limiting surface 3012. The limiting block 23 is fixedly arranged on the outer periphery of the rotating shaft 24. In the initial state, the first limiting surface 3011 is in a horizontal state, the second limiting surface 3012 is in a vertical state, and the limiting block 23 abuts against the first limiting surface 3011, so that the guide rod 32 and the lead screw 33 are in a horizontal state.

[0031] Refer to Figure 2 , Figure 3 , Figure 5 , Figure 7 , the rotating assembly includes an electromagnet 40 and a mounting bracket for mounting the electromagnet 40. Sliding seats 30 are arranged at both ends of the mounting bracket. The guide rod 32 passes through the sliding seat 30 and is slidably connected thereto. A threaded block 36 is fixed to the lower end surface of the sliding seat 30. The lead screw 33 passes through the threaded block 36 and is threadedly connected thereto. The mounting bracket can slide along the guide rod 32 with the sliding seat 30. The mounting bracket includes a mounting base 41, a sleeve rod 31, and two symmetrically arranged connecting frames 42. The electromagnet 40 is rotatably connected within the mounting base 41. A servo motor is fixed to the lower end surface of the mounting base 41. The electromagnet 40 is fixed to the output shaft of the servo motor. The two connecting frames 42 are both fixed on the outer periphery of the mounting base 41. The two sleeve rods 31 are respectively fixed at one ends of the two connecting frames 42 away from the mounting base 41. The two sleeve rods 31 can slide together with the two sliding seats 30. A connecting rod 35 is fixed between the ends of the two guide rods 32 away from the rotating disk 34. The ends of the two lead screws 33 away from the rotating disk 34 both pass through the connecting rod 35. Two stepper motors are fixed on the connecting rod 35. The two lead screws 33 are respectively fixed to the output shafts of the two stepper motors. A chute 39 is provided in each of the two sleeve rods 31. The ends of the chute 39 away from the rotating disk 34 and away from the mounting base 41 are both open. Slide rods 37 are fixedly arranged on the side end faces of the two sliding seats 30 close to the sleeve rods 31. The two slide rods 37 are respectively slidably connected within the two chutes 39. A spring 38 is fixed between the end of the slide rod 37 close to the rotating disk 34 and the side wall of the corresponding chute 39 close to the rotating disk 34.

[0032] Refer to Figure 1 , Figure 2 , Figure 4, a protective shell 20 is arranged outside the worm gear 21. A connecting shaft 26 is fixed on the end face of the side of the worm gear 21 away from the rotating disc 34. The connecting shaft 26 is rotatably connected inside the protective shell 20. The worm gear 21, the worm 22 and the rotating disc 34 are all located inside the protective shell 20. Both ends of the worm 22 are rotatably connected inside the protective shell 20. A motor is fixed on the outer side face of the protective shell 20. The worm 22 is fixed on the output shaft of the motor. A through groove 25 is formed in the protective shell 20. The guide rod 32 and the lead screw 33 both penetrate through the through groove 25 and can rotate 90 degrees around the connecting shaft 26 in the through groove 25.

[0033] Referring to Figure 1 , the present invention further provides a sheet metal bending machine, which includes the above-mentioned sheet metal clamping structure, a frame 10, an upper die 11 and a lower die 12. The sheet metal clamping structure is detachably installed on the frame 10. The upper end face of the electromagnet 40 is flush with the upper end face of the lower die 12. The two protective shells 20 inside the sheet metal clamping structure are respectively fixed on the two side end faces of the frame 10 by bolts. The initial positions of the guide rod 32 and the lead screw 33 are in a horizontal state.

[0034] The stepping motor, the servo motor and the motor on the protective shell 20 are connected through a single-chip microcomputer, and the single-chip microcomputer is connected to the control system in the bending machine.

[0035] Before the bending operation, an iron sheet metal is selected as the forming material of the hollow cabinet body. The center of the cabinet body sheet metal is positioned, and the center of the cabinet body sheet metal is placed at the center of the electromagnet 40. After the electromagnet 40 is energized, it attracts the cabinet body sheet metal and fixes it on the electromagnet 40. One side of the cabinet body sheet metal is parallel to the lower die 12.

[0036] Initially, the sliding seat 30 is located at the middle position of the guide rod 32. The sliding seat 30 at this position is set as the initial position. The stepping motor is controlled by the single-chip microcomputer to start, thereby driving the lead screw 33 to rotate, and then making the threaded block 36 move towards the direction close to the bending machine, thereby driving the sliding seat 30 to move towards the direction close to the bending machine, so that the mounting bracket moves towards the direction close to the bending machine, and then driving the sheet metal to move towards the direction close to the bending machine until the position to be bent of the sheet metal is directly opposite to the groove of the lower die 12. The single-chip microcomputer records the moving distance of the threaded block 36.

[0037] At this time, the bending machine is started, and the control system of the bending machine controls the start of the hydraulic system therein, thereby driving the upper die 11 to press down, cooperating with the lower die 12 to bend the cabinet body sheet metal part. At the same time, the single-chip microcomputer receives the signal output by the control system of the bending machine, thereby controlling the start of the motor on the protective shell 20, thereby driving the worm 22 to rotate, and further causing the worm wheel 21 to rotate, and further driving the rotating shaft 24 to rotate, thereby causing the limit block 23 to rotate. By abutting the limit block 23 against the first limit surface 3011, the rotating disk 34 is driven to rotate around the connecting shaft 26, thereby turning up the cabinet body sheet metal part, so that the rest of the cabinet body sheet metal part except the bending position remains flat.

[0038] When one side of the cabinet body sheet metal part is bent, the control system in the bending machine controls the upper die 11 to rise. At this time, the single-chip microcomputer receives the signal output by the control system of the bending machine, then the single-chip microcomputer controls the motor on the protective shell 20 to reverse, thereby driving the cabinet body sheet metal part to fall back to the horizontal state. Then the motor on the protective shell 20 is turned off. At this time, the single-chip microcomputer controls the stepping motor to reverse with the initial moving distance of the threaded block 36 as the preset value, thereby driving the threaded block 36 to move away from the bending machine to the initial position with the length of the initial movement.

[0039] Then, the single-chip microcomputer controls the servo motor to rotate, thereby driving the electromagnet 40 to rotate 90 degrees, and further causing the cabinet body sheet metal part to rotate 90 degrees around the axis of the electromagnet 40, so that the unbent lower side of the cabinet body sheet metal part rotates to be parallel to the lower die 12 and close to the side of the bending machine.

[0040] Then repeat the above movement process to complete the bending operation of the cabinet body sheet metal part, so that it forms a cabinet body with a hollow middle.

[0041] If high-quality aluminum alloy plates or titanium materials are needed to improve the strength of the hollow cabinet body, after placing the high-quality aluminum alloy sheet metal part at the center of the electromagnet 40, an iron disk can be pressed on the sheet metal part, and the iron disk is attracted by the electromagnet 40 to clamp the high-quality aluminum alloy sheet metal part on the electromagnet 40, so as to realize the bending and forming of the high-quality aluminum alloy sheet metal part and make it form a high-strength hollow cabinet body.

[0042] Those skilled in the art can clearly understand that various modifications can be made to the above embodiments without departing from the general spirit and concept of the present invention. They all fall within the protection scope of the present invention. The protection scheme of the present invention is subject to the claims attached to the present invention.

Claims

1. A clamping structure for sheet metal parts, characterized in that: It includes two swing components that drive the sheet metal part to turn up during the bending process and a rotating component that controls the sheet metal part to rotate 90 degrees. The two swing components are symmetrically arranged. The rotating component is arranged between the two swing components. The sheet metal part is fixed to the rotating component, and the rotating component can slide along the swing component to control the bending position of the sheet metal part.

2. The clamping structure for sheet metal parts according to claim 1, characterized in that: The swing component includes a rotating disk (34), a guide rod (32), and a lead screw (33). The guide rod (32) is fixed on the outer circumference of the rotating disk (34). One end of the lead screw (33) close to the rotating disk (34) is rotatably connected to the inner part of the outer circumference of the rotating disk (34). The guide rod (32) and the lead screw (33) are arranged in parallel.

3. The clamping structure for sheet metal parts according to claim 2, wherein: On the end faces of the two rotating disks (34) away from each other, worm gears (21) are rotatably arranged. On the lower sides of the two worm gears (21), worm shafts (22) are engaged. On the end face of the worm gear (21) close to the rotating disk (34), a rotating shaft (24) located at its center is fixedly provided. A connecting hole (302) is opened at the center of the rotating disk (34). The rotating shaft (24) is rotatably connected to the corresponding connecting hole (302). An arc-shaped groove (301) located outside the connecting hole (302) and communicating with the connecting hole (302) is opened in the rotating disk (34). A limiting block (23) is fixedly provided on the outer circumference of the rotating shaft (24). The limiting block (23) is slidably connected in the arc-shaped groove (301) on the corresponding side.

4. A clamping structure for sheet metal parts according to claim 3, characterized in that: The arc length of the outer peripheral wall of the arc-shaped groove (301) is three-quarters of a circle arc, and the arc length of the outer circumference of the limiting block (23) is one-quarter of a circle arc. The limiting block (23) can rotate 90 degrees with the rotating shaft (24) as the center in the arc-shaped groove (301).

5. A clamping structure for sheet metal parts according to claim 2, characterized in that: The rotating component includes an electromagnet (40) and a mounting bracket for mounting the electromagnet (40). Sliding seats (30) are arranged at both ends of the mounting bracket. The guide rod (32) passes through the sliding seat (30) and is slidably connected to it. A threaded block (36) is fixed to the lower end face of the sliding seat (30). The lead screw (33) passes through the threaded block (36) and is threadedly connected to it. The mounting bracket can slide along the guide rod (32) with the sliding seat (30).

6. The clamping structure for sheet metal parts according to claim 5, wherein: The mounting bracket includes a mounting base (41), a sleeve rod (31), and two symmetrically arranged connecting frames (42). The electromagnet (40) is rotatably connected in the mounting base (41). A servo motor is fixed to the lower end face of the mounting base (41). The electromagnet (40) is fixed to the output shaft of the servo motor. The two connecting frames (42) are both fixed on the outer circumference of the mounting base (41). The two sleeve rods (31) are respectively fixed at the ends of the two connecting frames (42) away from the mounting base (41). The two sleeve rods (31) can slide together with the two sliding seats (30).

7. The clamping structure for sheet metal parts according to claim 6, characterized in that: A connecting rod (35) is fixed between the ends of the two guiding rods (32) away from the rotating disc (34). The ends of the two lead screws (33) away from the rotating disc (34) both penetrate through the connecting rod (35). Two stepper motors are fixed on the connecting rod (35), and the two lead screws (33) are respectively fixed on the output shafts of the two stepper motors.

8. The clamping structure for sheet metal parts according to claim 7, characterized in that: Chute grooves (39) are formed in both of the two sleeve rods (31). The ends of the chute grooves (39) away from the rotating disc (34) and away from the mounting base (41) are both open. Slide rods (37) are fixedly arranged on the side end faces of the two sliding seats (30) close to the sleeve rods (31). The two slide rods (37) are respectively slidably connected in the two chute grooves (39). A spring (38) is fixed between the end of the slide rod (37) close to the rotating disc (34) and the side wall of the corresponding chute groove (39) close to the rotating disc (34).

9. The clamping structure for sheet metal parts according to claim 3, characterized in that: A protective shell (20) is arranged outside the worm gear (21). A connecting shaft (26) is fixed on the side end face of the worm gear (21) away from the rotating disc (34). The connecting shaft (26) is rotatably connected in the protective shell (20). The worm gear (21), the worm (22) and the rotating disc (34) are all located in the protective shell (20). Both ends of the worm (22) are rotatably connected in the protective shell (20). A motor is fixed on the outer side face of the protective shell (20). The worm (22) is fixed on the output shaft of the motor. A through groove (25) is formed in the protective shell (20). The guiding rod (32) and the lead screw (33) both penetrate through the through groove (25) and can rotate 90 degrees around the connecting shaft (26) in the through groove (25).

10. A sheet metal bending machine, comprising the sheet metal clamping structure according to any one of claims 1-9 above, a frame (10), an upper die (11), and a lower die (12), characterized in that: The sheet metal clamping structure is detachably installed on the frame (10). The upper end face of the electromagnet (40) is flush with the upper end face of the lower die (12). The two protective shells (20) in the sheet metal clamping structure are respectively fixed on the two side end faces of the frame (10) by bolts. The initial positions of the guiding rod (32) and the lead screw (33) are in a horizontal state.

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