A bending machine capable of quickly changing product specifications

Abstract

The present invention discloses a bending machine capable of quickly changing product specifications, which comprises a frame, on which a follower platform, a positioning mechanism, a U-supporting assembly, and a bending mechanism are arranged. The follower platform is used to support a workpiece and can be driven by the static friction of the workpiece to move left and right on the frame; the positioning mechanism is arranged on one side of the follower platform to position one end of the workpiece; the U-supporting assembly can be arranged on the follower platform to move left and right, and the U-supporting mechanism comprises at least two stacked support plates, and the same side of all the support plates is provided with a U-supporting portion capable of supporting a U-tube at the end of the workpiece, and all the support plates are connected together through a movable connection structure; the bending mechanism comprises a clamping device capable of clamping the workpiece on the follower platform, a roller, and a bending driver capable of driving the clamping device to rotate so that the workpiece is bent and formed close to the roller. The present invention can support the U-tube at the end of the heat exchanger during the process of bending the workpiece and reduce the damage to the fins during the bending process.

Description

Technical Field

[0001] The invention relates to a bending machine capable of quickly changing product specifications. Background Art

[0002] In the field of air conditioning parts production, the heat exchanger needs to be bent according to the shape of the air conditioner, such as bending the plate heat exchanger once into an L shape, bending it twice into a U shape, or bending it three times into a G shape. In the bending process of the air conditioning heat exchanger, the heat exchanger is first transported to the set position so that the part to be bent is close to the roller, and then the heat exchanger is clamped so that the heat exchanger is bent close to the curved surface of the roller.

[0003] For a workpiece made of at least two layers of heat exchangers, the bending radius of each layer of heat exchangers is different during the bending process. Therefore, during the bending process, the inner layer of the heat exchanger and the outer layer of the heat exchanger will slide relative to each other. In order to prevent the two adjacent layers of heat exchangers from rubbing against each other and crushing the fins, the prior art generally adopts the following solution, that is, before the bending operation, a plastic sheet is manually placed between the two heat exchangers to prevent the two heat exchangers from rubbing against each other and crushing the fins. This solution requires more manual intervention, has a low degree of automation, and increases labor costs. Summary of the invention

[0004] In view of this, an object of the present invention is to provide a bending machine that can support the U-tube at the end of the heat exchanger during the bending process, reduce damage to the fins during the bending process, and can quickly change product specifications.

[0005] The technical solution adopted by the present invention to solve the technical problem is:

[0006] A bending machine capable of quickly changing product specifications, comprising a frame, on which are arranged:

[0007] The follower platform is used to support the workpiece and can be driven by the static friction of the workpiece to move left and right on the frame;

[0008] A positioning mechanism, arranged on one side of the follower platform to position one end of the workpiece;

[0009] A U-supporting assembly is movably arranged on the follower platform, the U-supporting mechanism comprises at least two stacked supporting plates, all supporting plates are provided with a U-supporting portion capable of supporting a U-tube at the end of a workpiece on the same side, and all supporting plates are connected together by a movable connection structure so that each supporting plate can move left and right relative to the supporting plate of the next layer;

[0010] The bending mechanism comprises a clamping device capable of clamping the workpiece on the follower platform, a rotating roller, and a bending driver capable of driving the clamping device to rotate so that the workpiece is bent and formed close to the rotating roller.

[0011] Preferably, the bottommost pallet is a reference pallet, and the remaining pallets are follower pallets that can move left and right relative to the reference pallet, and the movable connection structure includes: an elongated hole provided on the follower pallet, a limiting column passing through the elongated holes of all follower pallets and connected to the reference pallet, a limiting block that can limit the upward movement of the follower pallet is provided at the upper end of the limiting column, and the elongated holes are arranged along the left and right direction so that the follower pallet can move left and right relative to the reference pallet.

[0012] Preferably, the follower platform is provided with a U-supporting driver capable of driving the U-supporting assembly to move left and right on the workbench so that each U-supporting part supports the corresponding U-tube.

[0013] Preferably, a horizontal moving frame is arranged below the follower platform, the support U driver is connected to the horizontal moving frame to drive the horizontal moving frame to move left and right, a lifting frame and a lifting driver capable of driving the lifting frame to move up and down are arranged on the horizontal moving frame, and the support U assembly is arranged on the lifting frame.

[0014] Preferably, a gap is provided on one side of the follower platform for the upper end of the lifting frame to pass through and move left and right therein, and when the upper end of the lifting frame is located in the gap, the support U assembly can be supported on the upper surface of the follower platform.

[0015] Preferably, a front roller frame and a rear roller frame are provided on the frame, the roller is rotatably arranged between the front roller frame and the rear roller frame, the clamping device is arranged on the roller, and the output end of the bending drive is connected to the roller to drive the clamping device and the roller to rotate around the axis of the roller together.

[0016] Preferably, the clamping device includes a clamping frame fixedly connected to a rotating roller, an upper clamping plate arranged on the clamping frame, a lower clamping plate movably arranged on the clamping frame, and a clamping driver capable of driving the lower clamping plate to move up and down relative to the upper clamping plate.

[0017] Preferably, the material clamping frame includes a cross beam, the lower clamping plate is arranged below the cross beam, the material clamping driver includes a motor arranged on the material clamping frame, the output end of the motor is connected to one end of the lower clamping plate through a wire rod pair, and the other end of the lower clamping plate is connected to the cross beam through a detachable connecting structure.

[0018] Preferably, the detachable connecting structure includes a vertical cylinder arranged on the cross beam and a transverse cylinder arranged on the lower clamping plate, the lower end of the telescopic rod of the vertical cylinder is provided with a connecting block, and the free end of the telescopic rod of the transverse cylinder is provided with a U-shaped fork, when the connecting block moves to the lowest point, the U-shaped fork can be inserted into the space between the connecting block and the vertical cylinder to limit the upward movement of the connecting block.

[0019] Preferably, the detachable connection structure also includes a locking kit arranged on the lower clamping plate, the locking kit is provided with a transverse hole for the U-shaped fork to extend into, and the top of the locking kit is provided with a through hole connected to the transverse hole, when the connecting block is inserted into the transverse hole through the through hole, the U-shaped fork is inserted along the transverse hole between the connecting block and the top wall of the transverse hole to limit the connection block from detaching from the locking kit.

[0020] Preferably, the frame is provided with a lifting base and a driving device capable of driving the lifting base to move up and down, the lifting base is provided with a guide rail capable of guiding left and right, the follower platform is provided on the guide rail and can be driven by the static friction force of the workpiece to move along the guide rail, and the lifting base is also provided with a reset device capable of driving the follower platform to reset.

[0021] Preferably, the lower clamp is provided with a blanking plate and a blanking driver capable of driving the blanking plate to move forward and backward, the lower clamp is disconnected from the crossbeam, and the blanking plate can push the workpiece to eject the workpiece forward or backward.

[0022] The beneficial effect of the present invention is as follows: taking a workpiece composed of three layers of heat exchangers as an example, the left ends of the three layers of heat exchangers are connected together by side plates, and the right ends are not connected to each other; accordingly, three pallets should also be used, of which the bottom pallet is the reference pallet, and the other two pallets are follower pallets. After the workpiece is loaded onto the follower platform, the left end of the workpiece is positioned by the positioning mechanism, and the support U assembly moves to the left, so that the U tube on the right side of the three-layer heat exchanger is supported on the support U part of the three pallets, and the left end of the support U part presses against the left end face of the corresponding heat exchanger. The state at this time is as follows: Figure 2 As shown; then the left part of the workpiece is held by the clamping device, so that the workpiece is close to the roller and rotates at a moving angle, and the workpiece can be bent into shape. In this process, the follower platform moves left and right with the bottom layer of heat exchanger, the reference support plate and the follower platform are relatively stationary, and the right end of the two upper layers of heat exchangers will push the corresponding follower support plate to the right, and finally form Figure 3During the bending process, since the U-tube on the right side of each heat exchanger is supported on the corresponding support plate, the U-tube is the main force point, so the fin will not be subjected to large vertical pressure and large horizontal friction during the bending process, which can avoid damage to the fin and help improve the yield rate; and there is no need to manually pad plastic sheets between each heat exchanger, which also improves work efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 is an exploded view of the present invention;

[0024] Figure 2 This is the main view of the first working condition of the follower platform and the support U assembly;

[0025] Figure 3 This is the main view of the second working condition of the follower platform and the support U assembly;

[0026] Figure 4 yes Figure 3 A partial enlarged view of part A;

[0027] Figure 5 This is the main view of the third working condition of the follower platform and the support U assembly;

[0028] Figure 6 It is a cross-sectional view of the first working condition of the support U assembly;

[0029] Figure 7 This is an exploded view of the follower platform and the support U assembly;

[0030] Figure 8 It is a structural schematic diagram of the guide mechanism between the pallets;

[0031] Fig. 9 It is a stereogram of the first working condition of the present invention;

[0032] Fig.10 is a stereogram of the second working condition of the present invention;

[0033] Fig.11 It is an exploded view of the main parts of the bending mechanism;

[0034] Fig.12 It is an exploded view of the detachable connection structure;

[0035] Fig.13 It is a three-dimensional diagram of the positioning mechanism. DETAILED DESCRIPTION

[0036] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the accompanying drawings.

[0037] Reference Figures 1 to 13The embodiment of the present invention proposes a bending machine capable of quickly changing product specifications, which includes a frame 6, on which a follower platform 1, a positioning mechanism, a U-supporting assembly, and a bending mechanism are arranged. The follower platform 1 is used to support the workpiece 3 and can be driven by the static friction of the workpiece 3 to move left and right on the frame 6; the positioning mechanism is arranged on one side of the follower platform 1 to position one end of the workpiece 3; the U-supporting assembly is arranged on the follower platform 1 so as to be movable left and right, and the U-supporting mechanism includes at least two stacked support plates, and the same side of all the support plates is provided with a U-supporting portion 201 capable of supporting a U tube 301 at the end of the workpiece 3, and all the support plates are connected together by a movable connection structure so that each support plate can move left and right relative to the support plate of the next layer; the bending mechanism includes a clamping device capable of clamping the workpiece 3 on the follower platform 1, a roller 4, and a bending driver capable of driving the clamping device to rotate so that the workpiece 3 is bent and formed close to the roller 4. We define the bottommost pallet as the reference pallet 21 , and the remaining pallets are follower pallets 22 that can move left and right relative to the reference pallet 21 .

[0038] As a preferred solution of the present invention, the follower platform 1 is provided with a U-supporting driver capable of driving the U-supporting assembly to move left and right on the workbench so that each U-supporting part 201 supports the corresponding U-tube 301. Figures 2 to 5 In this solution, the positioning mechanism is arranged on the left side of the follower platform 1, the U-supporting assembly is arranged on the right side of the follower platform 1, and the U-supporting portion 201 is arranged on the left side of the pallet. Taking the workpiece 3 composed of three layers of heat exchangers as an example, the left ends of the three layers of heat exchangers are connected together by side plates, and the right ends are not connected to each other; accordingly, three pallets should also be used, of which the bottom layer of pallets is the reference pallet 21, and the other two pallets are follower pallets 22. After the workpiece 3 is loaded onto the follower platform 1, the left end of the workpiece 3 is positioned by the positioning mechanism, and the U-supporting assembly moves to the left, so that the U tube 301 on the right side of the three-layer heat exchanger is supported on the U-supporting portion 201 of the three pallets, and the left end of the U-supporting portion 201 is pressed against the corresponding left end face of the heat exchanger. The state at this time is as follows. Figure 2 As shown; then the left part of the workpiece 3 is held by the clamping device, so that the workpiece 3 is closely attached to the roller 4 and rotated at a certain angle, and the workpiece 3 can be bent into shape. In this process, the follower platform 1 moves left and right with the bottom layer of the heat exchanger, the reference support plate 21 and the follower platform 1 are relatively stationary, and the right ends of the two upper layers of the heat exchanger will push the corresponding follower support plate 22 to the right, and finally form Figure 3 During the bending process, since the U-tube 301 on the right side of each heat exchanger is supported on the corresponding support plate, the U-tube 301 is the main force point, so the fin will not be subjected to large vertical pressure and large horizontal friction during the bending process, which can avoid damage to the fin and help improve the yield rate; and there is no need to manually pad plastic sheets between each heat exchanger, which also improves work efficiency.

[0039] Reference Figure 6The movable connection structure includes: an elongated hole 221 provided on the follower support plate 22, a limiting column 23 passing through the elongated holes 221 of all the follower support plates 22 and connected to the reference support plate 21, a limiting block 231 capable of limiting the upward movement of the follower support plate 22 is provided at the upper end of the limiting column 23, and the elongated holes 221 are arranged along the left-right direction so that the follower support plate 22 can move left-right relative to the reference support plate 21. Optionally, the limiting column 23 adopts a screw, the threaded end of the screw is connected to the reference support plate 21, and the head of the screw serves as the above-mentioned limiting block 231. Before supporting the U-tube 301, the state of the supporting U assembly is as follows: Figure 6 As shown, at this time, the limit column 23 is located at the rightmost end of each elongated hole 221. After bending, the state of the support U assembly is as follows: Figure 4 After the workpiece 3 is removed, a fixed stopper can be set on the right side of the follower support plate 22, and the support U assembly can be moved to the right to press each follower support plate 22 to the top through the stopper. Figure 6 In the state shown, the follower support plate 22 can also be driven to move to the Figure 6 Status shown.

[0040] Reference Figure 7 A horizontal moving frame 51 is arranged below the follower platform 1. The support U driver adopts a motor (not shown). The motor is connected to the horizontal moving frame 51 through a threaded rod pair to drive the horizontal moving frame 51 to move left and right. The horizontal moving frame 51 is provided with a lifting frame 52 and a lifting driver 53 capable of driving the lifting frame 52 to move up and down. The lifting driver 53 is preferably a cylinder. The support U assembly is arranged on the lifting frame 52. Such a design is convenient for loading materials horizontally. When loading materials, first, the upper surface of the support U assembly is at the same height as the follower platform 1, or the support U assembly is located under the follower platform 1, and the workpiece 3 is horizontally loaded onto the follower platform 1 from right to left, which is very convenient.

[0041] Furthermore, a notch 11 is provided on one side of the follower platform 1, through which the upper end of the lifting frame 52 can pass and move left and right. When the upper end of the lifting frame 52 is located in the notch 11, the support U assembly can be supported on the upper surface of the follower platform 1. The advantage of this design is that during the bending process of the workpiece 3, the support U assembly is supported by the follower platform 1, which can improve the load capacity of the support U assembly.

[0042] In order to guide the support plates, a guide mechanism capable of guiding left and right is arranged between each two adjacent support plates.

[0043] Reference Figure 8 The guide mechanism includes a slide groove 202 which is arranged on a support plate and can guide left and right, and a slider 203 which is arranged on an adjacent support plate and cooperates with the slide groove 202.

[0044] Reference Fig.11, a front roller frame 61 and a rear roller frame 62 are provided on the frame 6, the roller 4 is rotatably provided between the front roller frame 61 and the rear roller frame 62, the clamping device is provided on the roller 4, and the bending driver (not shown) is preferably provided on the motor on the frame 6, and the motor is connected to the roller 4 through a reducer to drive the clamping device and the roller 4 to rotate around the axis of the roller 4. After the clamping device clamps the workpiece 3, the clamping device and the roller 4 rotate together around the axis of the roller 4 to bend the workpiece 3, which can minimize the occurrence of the situation such as the fin being crushed due to the relative movement between the roller 4 and the workpiece 3.

[0045] Optionally, the clamping device includes a clamping frame 72 fixedly connected to the rotating roller 4, an upper clamping plate 73 arranged on the clamping frame 72, a lower clamping plate 74 movably arranged on the clamping frame 72, and a clamping driver 75 capable of driving the lower clamping plate 74 to move up and down relative to the upper clamping plate 73.

[0046] In order to prevent the clamping force of the upper clamping plate 73 and the lower clamping plate 74 from being too large and crushing the fins on the workpiece 3, a height-equalizing iron 701 is provided between the upper clamping plate 73 and the lower clamping plate 74 to limit the minimum distance between the two. The height-equalizing iron 701 can be installed on either the upper clamping plate 73 or the lower clamping plate 74, and the height of the height-equalizing iron 701 is approximately equal to the thickness of the workpiece 3.

[0047] Reference Fig.11 The clamping frame 72 includes a vertical beam 721 and a horizontal beam 722, a lower clamping plate 74 is arranged below the horizontal beam 722, an upper clamping plate 73 is connected to the horizontal beam 722 and is located between the horizontal beam 722 and the lower clamping plate 74, and a clamping driver 75 includes a motor arranged on the clamping frame 72, an output end of the motor is connected to one end of the lower clamping plate 74 through a screw pair, and the other end of the lower clamping plate 74 is connected to the horizontal beam 722 through a detachable connection structure. The screw nut of the screw pair and the detachable connection structure are respectively connected to the two ends of the lower clamping plate 74, so that the force on the lower clamping plate 74 can be uniform, ensuring that the load capacity of the lower clamping plate 74 meets the requirements.

[0048] In one embodiment of the present invention, the detachable connection structure includes a vertical cylinder 703 disposed on the crossbeam 722 and a transverse cylinder 704 disposed on the lower clamping plate 74, a connection block 705 is disposed at the lower end of the telescopic rod of the vertical cylinder 704, and a U-shaped fork 706 is disposed at the free end of the telescopic rod of the transverse cylinder 704. When the connection block 705 moves to the lowest point, the U-shaped fork 706 can be inserted into the space between the connection block 705 and the vertical cylinder 703 to limit the upward movement of the connection block 705. Further, the detachable connection structure also includes a lock set 707 disposed on the lower clamping plate 74, the lock set 707 is provided with a transverse hole for the U-shaped fork 706 to extend therein, and a through hole communicating with the transverse hole is disposed at the top of the lock set 707. When the connection block 705 is inserted into the transverse hole through the through hole, the U-shaped fork 706 is inserted along the transverse hole between the connection block 705 and the top wall of the transverse hole to limit the connection block 705 from being separated from the lock set 707.

[0049] In certain embodiments of the present invention, the above-mentioned detachable connection structure can also adopt other structural forms, for example, it includes a swinging member arranged on the cross beam 722, and a hook is provided at the lower end of the swinging member. The cross beam 722 and the lower splint 74 can be connected by driving the swinging member to swing by a motor so that the hook hooks the bottom of the lower splint 74. When the swinging member is detached from the lower splint 74, the lower splint 74 and the cross beam 722 are detached.

[0050] Reference Figure 1 In one embodiment of the present invention, a lifting base 9 and a driving device capable of driving the lifting base 9 to move up and down are provided on the frame 6. A guide rail 91 capable of guiding left and right is provided on the lifting base 9. The follower platform 1 is provided on the guide rail 91 and can be driven by the static friction of the workpiece 3 to move along the guide rail 91. The lifting base 9 is also provided with a reset device capable of driving the follower platform 1 to reset. Preferably, the drive device (not shown) uses a motor as a power source, and the motor is connected to the lifting base through a screw pair; the reset device uses a cylinder 92, and the follower platform 1 is pushed up by the output end of the cylinder 92 to reset the follower platform 1. During the bending process of the workpiece 3, the output end of the cylinder is separated from the follower platform 1.

[0051] In this solution, after the workpiece 3 is loaded onto the follower platform 1, there is still a certain gap between the workpiece 3 and the roller 4. The driving device can be used to drive the lifting seat to move upward a certain distance so that the upper surface of the workpiece 3 is close to or close to the roller 4. Then, when the workpiece 3 is clamped by the clamping device and the workpiece 3 is bent, the relative movement between the workpiece 3 and the roller 4 can be further reduced, thereby further improving the quality rate of the product.

[0052] Reference Fig.12The positioning mechanism includes a positioning platform 81 and a positioning baffle 82 disposed on the positioning platform 81. The positioning mechanism also includes an adjustment driver 83 capable of driving the positioning baffle 82 to move left and right to adjust the position of the positioning baffle 82. The adjustment driver 83 is preferably a motor, which is connected to the positioning baffle 82 through a threaded rod pair. During the loading process of the workpiece 3, the workpiece 3 moves toward the positioning baffle 82. When the left end of the workpiece 3 abuts against the positioning baffle 82, the positioning of the workpiece 3 can be achieved. When the bending position of the workpiece 3 needs to be changed, the positioning baffle 82 can be driven to move left and right by the adjustment driver 83 to adjust the position of the positioning baffle 82.

[0053] Reference Fig.11 Further, the lower clamping plate 74 is provided with a blanking plate 708 and a blanking driver 709 capable of driving the blanking plate 708 to move forward and backward. The blanking driver 709 is preferably a motor, which is connected to the positioning baffle 82 through a threaded rod pair. After the lower clamping plate 74 is disconnected from the crossbeam 722, the blanking plate 708 can push the workpiece 3 to eject the workpiece 3 forward or backward.

[0054] The above are only preferred implementation modes of the present invention. Any technical solution that achieves the purpose of the present invention by substantially the same means shall fall within the protection scope of the present invention.

Claims

1. A bending machine capable of quickly changing product specifications, characterized in that: It comprises a frame (6), on which the frame (6) is provided: A follower platform (1) is used to support a workpiece (3) and can be driven by the static friction force of the workpiece (3) to move left and right on the frame (6); A positioning mechanism, arranged on one side of the follower platform (1) to position one end of the workpiece (3); A U-supporting assembly is movably arranged on the follower platform (1), the U-supporting assembly comprising at least two stacked supporting plates, a U-supporting portion (201) capable of supporting a U tube (301) at the end of a workpiece (3) being arranged on the same side of all the supporting plates, and all the supporting plates are connected together via a movable connection structure so that each supporting plate can move left and right relative to the supporting plate of the next layer; The bending mechanism comprises a clamping device capable of clamping a workpiece (3) on a follower platform (1), a rotating roller (4), and a bending driver capable of driving the clamping device to rotate so that the workpiece (3) is bent into shape close to the rotating roller (4); The bottommost support plate is a reference support plate (21), and the remaining support plates are all follower support plates (22) that can move left and right relative to the reference support plate (21), and the movable connection structure comprises: an elongated hole (221) provided on the follower support plate (22), a limiting column (23) that passes through the elongated holes (221) of all the follower support plates (22) and is connected to the reference support plate (21), a limiting block (231) that can limit the upward movement of the follower support plate (22) is provided at the upper end of the limiting column (23), and the elongated holes (221) are arranged along the left and right direction so that the follower support plate (22) can move left and right relative to the reference support plate (21); The follower platform (1) is provided with a U-supporting driver capable of driving the U-supporting assembly to move left and right on the workbench so that each U-supporting part (201) supports the corresponding U-tube (301); The workpiece (3) comprises at least two layers of heat exchangers, and the U-tubes (301) are respectively arranged at the ends of the corresponding heat exchangers. After the workpiece (3) is loaded onto the follower platform (1), the left end of the workpiece (3) is positioned by the positioning mechanism, and the U-supporting assembly moves to the left, so that the U-tube (301) is supported on the U-supporting portion (201) of the support plate, and the left end of the U-supporting portion (201) is pressed against the left end surface of the corresponding heat exchanger; then, the left part of the workpiece (3) is clamped by the clamping device, so that the workpiece is tightly attached to the roller (4) and rotated at a moving angle, so that the workpiece (3) can be bent into shape; in this process, the follower platform (1) moves left and right with the heat exchanger of the lowest layer, the reference support plate (21) and the follower platform (1) are relatively stationary, and the right end of the heat exchanger of the upper layer pushes the corresponding follower support plate (22) to the right.

2. A bending machine capable of quickly changing product specifications according to claim 1, characterized in that: A horizontal moving frame (51) is arranged below the follower platform (1); the support U driver is connected to the horizontal moving frame (51) to drive the horizontal moving frame (51) to move left and right; a lifting frame (52) and a lifting driver (53) capable of driving the lifting frame (52) to move up and down are arranged on the horizontal moving frame (51); and the support U assembly is arranged on the lifting frame (52).

3. A bending machine capable of quickly changing product specifications according to claim 2, characterized in that: A notch (11) is provided on one side of the follower platform (1) so that the upper end of the lifting frame (52) can pass through and move left and right therein; when the upper end of the lifting frame (52) is located in the notch (11), the support U assembly can be supported on the upper surface of the follower platform (1).

4. A bending machine capable of quickly changing product specifications according to claim 1, characterized in that: The frame (6) is provided with a front roller frame (61) and a rear roller frame (62); the roller (4) is rotatably arranged between the front roller frame (61) and the rear roller frame (62); the clamping device is arranged on the roller (4); and the output end of the bending drive is connected to the roller (4) to drive the clamping device and the roller (4) to rotate around the axis of the roller (4) together.

5. A bending machine capable of quickly changing product specifications according to claim 4, characterized in that: The material clamping device comprises a material clamping frame (72) fixedly connected to the rotating roller (4), an upper clamping plate (73) arranged on the material clamping frame (72), a lower clamping plate (74) movably arranged on the material clamping frame (72), and a material clamping driver (75) capable of driving the lower clamping plate (74) to move up and down relative to the upper clamping plate (73).

6. A bending machine capable of quickly changing product specifications according to claim 5, characterized in that: The material clamping frame (72) comprises a crossbeam (722), the lower clamping plate (74) is arranged below the crossbeam (722), and the material clamping driver (75) comprises a motor arranged on the material clamping frame (72), the output end of the motor is connected to one end of the lower clamping plate (74) through a threaded rod pair, and the other end of the lower clamping plate (74) is connected to the crossbeam (722) through a detachable connection structure.

7. A bending machine capable of quickly changing product specifications according to claim 6, characterized in that: The detachable connection structure comprises a vertical cylinder (703) arranged on the crossbeam (722) and a transverse cylinder (704) arranged on the lower clamping plate (74); a connecting block (705) is provided at the lower end of the telescopic rod of the vertical cylinder (703); a U-shaped fork (706) is provided at the free end of the telescopic rod of the transverse cylinder (704); when the connecting block (705) moves to the lowest point, the U-shaped fork (706) can be inserted into the space between the connecting block (705) and the vertical cylinder (703) to limit the upward movement of the connecting block (705).

8. A bending machine capable of quickly changing product specifications according to claim 7, characterized in that: The detachable connection structure further comprises a lock set (707) arranged on the lower clamping plate (74), the lock set (707) being provided with a transverse hole into which the U-shaped fork (706) can extend, and the top of the lock set (707) being provided with a through hole connected to the transverse hole, and when the connection block (705) is inserted into the transverse hole through the through hole, the U-shaped fork (706) is inserted along the transverse hole between the connection block (705) and the top wall of the transverse hole to limit the connection block (705) from being separated from the lock set (707).

9. A bending machine capable of quickly changing product specifications according to claim 1, characterized in that: The frame (6) is provided with a lifting base (9) and a driving device capable of driving the lifting base (9) to move up and down; the lifting base (9) is provided with a guide rail (91) capable of guiding left and right; the follower platform (1) is provided on the guide rail (91) and can be driven by the static friction force of the workpiece (3) to move along the guide rail (91); the lifting base (9) is also provided with a resetting device capable of driving the follower platform (1) to reset.

10. A bending machine capable of quickly changing product specifications according to claim 6, characterized in that: The lower clamping plate (74) is provided with a blanking plate (708) and a blanking driver (709) capable of driving the blanking plate (708) to move forward and backward. The lower clamping plate (74) is disconnected from the crossbeam (722). The blanking plate (708) is capable of pushing the workpiece (3) to eject the workpiece (3) forward or backward.

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