Automatic material changing and winding device for packaging bag film roll

Abstract

The present invention relates to the technical field of winding devices and discloses an automatic material changing and winding device for packaging bag film rolls, comprising a frame body, a workbench is provided at the input end of the film roll of the frame body, two guide rollers are rotatably provided at the bottom of the workbench, a tensioning mechanism and a smooth roller mechanism are provided inside the frame body, a winding roller is provided at the front side of the smooth roller mechanism, the smooth roller mechanism comprises a smooth roller driven by a motor, the winding roller is matched with the smooth roller through film roll contact, roller changing mechanisms are provided on both sides of the smooth roller mechanism, the roller changing mechanisms comprise a shifting mechanism and a placer, a transition mechanism is provided at the inclined surface on the front side of the smooth roller mechanism of the frame body, and a material discharging rack is provided at the front side of the smooth roller mechanism of the frame body. The device realizes rapid roller changing operation without stopping the machine, ensures the continuity of winding, saves roller changing time and the labor cost required for roller changing, solves the problem of material waste caused by roller changing process, and greatly improves processing efficiency.

Description

Technical Field

[0001] The invention relates to the technical field of winding devices, and in particular to an automatic material changing and winding device for packaging bag film rolls. Background Art

[0002] A packaging bag is a bag-shaped container used to package items. It is usually made of materials such as plastic, paper, and cloth. The processing process includes raw material batching, melt plasticization, extrusion molding, cooling and shaping, cutting, inspection, etc. After being melted and shaped by the extruder, a plastic film is formed. After it is rolled up, it is transferred to the next workshop for dyeing. This process still requires unwinding and rewinding. The existing rewinding device only relies on the motor-driven rewinding roller to cooperate with the tensioning mechanism for rewinding. When performing the rewinding roller material replacement operation, it is necessary to stop the unwinding equipment or other film roll conveying equipment in advance, and then remove the rewinding roller manually, and then install the new rewinding roller for rewinding. Due to the long working time of the roller change, it cannot meet the continuous operation requirements, and at least two people are required to operate. If the extruder is reeled, the roller needs to be changed during the discharge. The discharge action will not stop due to the roller change. At this time, the packaging bag film output during the roller change process becomes waste, which is relatively wasteful. Now a rewinding device that can quickly change the roller without stopping the machine under continuous operation is needed. Summary of the invention

[0003] The technical problem to be solved by the present invention is to overcome the above difficulties and provide an automatic material changing and winding device for packaging bag film rolls.

[0004] In order to solve the above technical problems, the technical solution provided by the present invention is: an automatic material changing and winding device for packaging bag film rolls, comprising a frame and a winding roller, the frame is provided with a workbench at the film roll input end, two guide rollers are rotatably arranged at the bottom of the workbench, and a tensioning mechanism and a smooth roller mechanism are arranged inside the frame;

[0005] The smooth roller mechanism includes a motor 1, a reduction gear box, a smooth roller and a side frame. The smooth roller is rotatably arranged on the side frame. The output end of the motor 1 is connected to the reduction gear box. The output end of the reduction gear box drives the smooth roller to rotate through a sprocket structure. A guide roller 2 is rotatably arranged between the two side frames. The guide roller 2 is in close contact with the smooth roller.

[0006] Roller changing mechanisms are provided on both sides of the smooth roller mechanism, and the roller changing mechanism includes a shifting mechanism and a placer. The shifting mechanism includes a second motor, a driving shaft and a turntable. The second motor drives the driving shaft to rotate, and the two ends of the driving shaft respectively drive the two turntables to rotate on the outside of the side frame through a pulley structure. Four mounting platforms are evenly arranged on the side of the turntable, and the placer is installed on the mounting platform. The winding roller is mounted on the corresponding placers on both sides, and the winding roller cooperates with the smooth roller transmission through the film roll contact.

[0007] As an improvement: the placer includes a column frame and a U-shaped table, the U-shaped table is slidably arranged on the inner side of the column frame, a driving plate is provided on one side of the U-shaped table, a cylinder is fixed on the mounting table, the output end of the cylinder is connected to the bottom of the driving plate, a support table cooperating with the winding roller is provided on the U-shaped table, a limit table is slidably arranged at the through hole on the inner side of the U-shaped table, a spring connected to the U-shaped table is provided on the rear side of the limit table, a positioning column slidably cooperating with the through hole on the rear side of the limit table is provided at the groove on the inner side of the U-shaped table, the limit table and the support table cooperate to fix the winding roller on the U-shaped table, and the fixing and shifting actions of the winding roller are realized by the placer.

[0008] As an improvement: the frame is provided with a transition mechanism at the inclined surface on the front side of the smooth roller mechanism, the transition mechanism includes cylinder 2, an inclined platform, a transition platform and a top platform, the inclined platform is slidably matched with the inclined surface on the front side of the frame, a driving plate 2 is provided on the side of the inclined platform, the bottom of cylinder 2 is fixed to the outside of the frame, and the top is connected to the driving plate 2, a support plate is provided on the inclined platform, the transition platform is slidably arranged on the top inclined surface of the inclined platform, springs 2 are provided between the support plates of the transition platform, the top platform is slidably arranged on the transition platform in parallel, a spring 3 is provided between the top platform and the transition platform, and a top plate is provided on the side of the top platform close to the roller changing mechanism, and the winding roller is stably moved from the placer to the discharge rack through the transition mechanism.

[0009] As an improvement: an inclined insertion platform is provided on the top of the inclined table, and cylinder 2 pushes the inclined insertion platform to slide obliquely to the inclined surface of the limit platform. Wheel grooves are provided on the inclined table and the inclined insertion platform, and rollers that cooperate with the wheel grooves are provided at the bottom of the inclined insertion platform, so that the winding roller can be stably transferred from the placer to the transition mechanism.

[0010] As an improvement: the frame is provided with a discharge rack on the front side of the smooth roller mechanism, an arc frame is provided on the top of the discharge rack, and a blocking column is provided at the bottom of the arc frame. The winding roller is moved to the arc frame by the transition mechanism, and the arc frame of the discharge rack is used to facilitate the winding roller to be kept away from the smooth roller to avoid collision with the smooth roller when the winding roller is lifted.

[0011] As an improvement: the winding roller includes a roller body, a winding drum is sleeved on the roller body, the surface of the winding drum is sticky, shaft sleeves are rotatably provided at both ends of the roller body, positioning ring plates are provided on both sides of the shaft sleeves, the shaft sleeves are in contact with the support platform, the limit platform and the top plate, the support platform, the limit platform and the top plate are arranged between the two positioning ring plates, so as to improve the rapid winding ability of the winding roller and limit the axial movement.

[0012] As an improvement: the frame is provided with a placing platform at the rear side of the smooth roller mechanism, the placing platform is in contact with the shaft sleeve, and the placing platform is arranged between two positioning ring plates. Through pre-positioning, the installation of the winding roller is facilitated.

[0013] Compared with the prior art, the beneficial effects of the present invention are as follows: the device realizes the rapid roll changing operation without stopping the machine, ensures the continuity of winding, saves the roll changing time and the labor cost required for roll changing, solves the material waste caused by the roll changing process, and greatly improves the processing efficiency. Specifically:

[0014] 1. The roller changing operation is realized through the roller changing mechanism, and the turntables on both sides are rotated periodically at a fixed angle through the position changing mechanism, so that the working state of the winding roller can be switched in three positions, thereby achieving the effect of roller changing without stopping the machine;

[0015] 2. The design of the winding roller contacting with the smooth roller through the film roll makes the winding roller free from the fixed connection with the transmission structure, providing a basis for rapid roller replacement. With the placement device, the winding roller can ensure the transmission effect while being away from the axis of the smooth roller;

[0016] 3. Through the design of the transition mechanism, the winding roller can be smoothly separated from the placement device, so that the roller changing mechanism can carry out the next roller changing operation. The early action of the transition mechanism enables the winding roller to continue the winding operation. In the later action, the winding roller after winding is moved to the discharge rack to avoid the winding roller after winding collides with the smooth roller during lifting. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 This is a schematic diagram of the structure of an automatic film rewinding device for packaging bags of the present invention. Figure 1 .

[0018] Figure 2 This is a schematic diagram of the structure of an automatic film rewinding device for packaging bags of the present invention. Figure 2 .

[0019] Figure 3 It is a cross-sectional view of an automatic material changing and winding device for packaging bag film rolls of the present invention.

[0020] Figure 4 The present invention is a schematic structural diagram of a smooth roller mechanism of an automatic material changing and winding device for a packaging bag film roll.

[0021] Figure 5 The present invention is a schematic structural diagram of a roller changing mechanism of an automatic material changing and winding device for a packaging bag film roll.

[0022] Figure 6 The present invention is a schematic structural diagram of a placing device for an automatic material changing and winding device for packaging bag film rolls.

[0023] Figure 7 It is a cross-sectional view of a placer of an automatic material changing and winding device for a packaging bag film roll of the present invention.

[0024] Figure 8The present invention is a schematic structural diagram of a transition mechanism of an automatic material changing and winding device for packaging bag film rolls.

[0025] Fig. 9 It is an exploded view of a transition mechanism of an automatic material changing and winding device for a packaging bag film roll of the present invention.

[0026] Fig.10 The present invention is a schematic structural diagram of a discharging frame of an automatic material changing and winding device for packaging bag film rolls.

[0027] Fig.11 The present invention is a schematic structural diagram of a winding roller of an automatic material changing and winding device for a packaging bag film roll.

[0028] As shown in the figure: 1. frame; 2. smooth roller mechanism; 3. roller changing mechanism; 4. shifting mechanism; 5. placement device; 6. transition mechanism; 7. unloading frame; 8. winding roller; 9. tensioning mechanism; 11. guide roller 1; 12. workbench; 13. placement table; 14. positioning plate; 21. motor 1; 22. reduction box; 23. sprocket 1; 24. smooth roller; 25. sprocket 2; 26. side frame; 27. guide roller 2; 41. motor 2; 411. gear 1; 42. drive shaft; 421. gear 2; 422. groove wheel 1; 43. turntable; 431. groove wheel 2; 432. mounting table; 433. cylinder 1; 51. Column frame; 511. Roller entry groove; 512. Positioning groove; 52. U-shaped table; 521. Drive plate one; 522. Support table; 523. Positioning column; 53. Limiting table; 531. Spring one; 61. Cylinder two; 62. Inclined table; 621. Drive plate two; 622. Support plate; 623. Spring two; 624. Inclined insertion table; 625. Wheel groove; 63. Transition table; 64. Top table; 641. Spring three; 642. Top plate; 643. Roller; 71. Arc frame; 72. Stop column; 81. Roller body; 82. Winding drum; 83. Bushing; 84. Positioning ring plate; 91. Guide roller three; 92. Adjusting roller. DETAILED DESCRIPTION

[0029] The present invention is further described in detail below in conjunction with the accompanying drawings.

[0030] Combined with Figure 1 , Attachment Figure 2 and attached Figure 3 As shown, an automatic material changing and winding device for packaging bag film rolls includes a frame 1 and a winding roller 8. The frame 1 is provided with a workbench 12 at the film roll input end, and two guide rollers 11 are rotatably provided at the bottom of the workbench 12. A tensioning mechanism 9 and a smooth roller mechanism 2 are provided on the inner side of the frame 1. The smooth roller mechanism 2 includes a smooth roller 24 and a guide roller 27. The tensioning mechanism 9 includes two guide rollers 3 91 and a liftable adjusting roller 92. The film roll passes through the guide roller 11, the guide roller 3 91, the adjusting roller 92, the guide roller 27, the smooth roller 24 and the winding roller 8 in sequence.

[0031] Combined with Figure 3 and attached Figure 4 As shown, the smooth roller mechanism 2 also includes a motor 21, a reduction gear box 22 and a side frame 26. The smooth roller 24 is rotatably arranged on the side frame 26. The output end of the motor 21 is connected to the reduction gear box 22. A sprocket 23 is provided at the output end of the reduction gear box 22. A sprocket 25 is provided at one end of the smooth roller 24. The sprocket 23 and the sprocket 25 are matched through chain transmission. A guide roller 27 is rotatably arranged between the two side frames 26. The guide roller 27 is closely attached to the smooth roller 24. The winding roller 8 is matched with the smooth roller 24 through film roll contact.

[0032] Working principle of the smooth roller mechanism 2: Motor 1 21 drives sprocket 1 23 to rotate through reduction box 22, sprocket 1 23 cooperates with sprocket 2 25 through chain transmission to drive smooth roller 24 to rotate, and the rotation of smooth roller 24 will drive guide roller 2 27 and winding roller 8 to rotate, and the film roll passes through guide roller 27 and adheres to smooth roller 24, and is wound at winding roller 8, and winding roller 8 is closely attached to smooth roller 24 through the film roll, so that winding roller 8 rotates continuously.

[0033] Combined with Figure 1 , Attachment Figure 4 and attached Figure 5 As shown, roller changing mechanisms 3 are provided on both sides of the smooth roller mechanism 2, and the roller changing mechanism 3 includes a shifting mechanism 4 and a placer 5. The shifting mechanism 4 includes a motor 2 41, a driving shaft 42 and a turntable 43. A gear 1 411 is provided at the output end of the motor 2 41, and a gear 2 421 meshing with the gear 1 411 is provided on the driving shaft 42. A groove wheel 1 422 is provided at both ends of the driving shaft 42. The turntable 43 is rotatably arranged on the outside of the side frame 26, and a groove wheel 2 431 is provided on the outside of the turntable 43. The groove wheel 1 422 cooperates with the groove wheel 2 431 through belt transmission. Four mounting platforms 432 are evenly arranged on the sides of the turntable 43, and the placer 5 is installed on the mounting platform 432. The winding roller 8 is mounted on the corresponding placers 5 on both sides.

[0034] Working principle of the shifting mechanism 4: Motor 2 41 drives gear 1 411 to rotate, and through the meshing transmission of gear 1 411 and gear 2 421, the driving shaft 42 is driven to rotate, and the groove wheel 1 422 cooperates with the groove wheel 2 431 through belt transmission to rotate the turntable 43, and the placer 5 on the mounting table 432 is shifted, driving the winding roller 8 on the placer 5 to shift, the placer 5 at the placement table 13 position loads the winding roller 8, the winding roller 8 on the top placer 5 prepares for winding and the initial winding, and the winding roller 8 on the placer 5 at the transition mechanism 6 position performs the later winding, and the winding roller 8 is moved from the placement table 13 position and the top position to the transition mechanism 6 position through the shifting mechanism 4 to realize the automation of roller changing.

[0035] Combined with Figure 2 , Attachment Figure 5, Attachment Figure 6 and attached Figure 7 As shown, the placer 5 includes a column frame 51 and a U-shaped platform 52. The top of the column frame 51 is provided with a roller entry groove 511 and a positioning groove 512. The U-shaped platform 52 is slidably arranged on the inner side of the column frame 51. A driving plate 521 is provided on one side of the U-shaped platform 52. A cylinder 433 is fixed on the mounting platform 432. The output end of the cylinder 433 is connected to the bottom of the driving plate 521. A support platform 522 cooperating with the winding roller 8 is provided on the U-shaped platform 52. A limit platform 53 is slidably provided at the groove on the inner side of the U-shaped platform 52. A spring 531 connected to the U-shaped platform 52 is provided on the rear side of the limit platform 53. A positioning column 523 slidably matched with the through hole on the rear side of the limit platform 53 is provided at the inner through hole of the U-shaped platform 52. The limit platform 53 cooperates with the support platform 522 to fix the winding roller 8 on the U-shaped platform 52. An arc-shaped positioning plate 14 is provided on the frame body 1, and the positioning plate 14 passes through the positioning groove 512.

[0036] Working principle of the placement device 5: the cylinder 433 pushes the U-shaped platform 52 to slide on the inner side of the column frame 51 through the driving plate 521. When the winding roller 8 is installed on the placement device 5, the end of the winding roller 8 enters the position of the limit platform 53 through the roller entry groove 511. Press hard to make the limit platform 53 enter the inner through hole of the U-shaped platform 52, so that the end of the winding roller 8 moves to the support platform 522. The spring 531 pushes the limit platform 53 to reset, so that the end of the winding roller 8 is stuck in the position of the limit platform 53 and the support platform 522, so that the winding roller 8 moves with the U-shaped platform 52. The winding roller 8 is installed at the placement platform 13. After the installation is completed, There is a gap between the winding roller 8 and the smooth roller 24, and it moves to the top. When the roller is changed and reeled, the U-shaped platform 52 drives the winding roller 8 to descend, so that the winding roller 8 is close to the smooth roller 24, and the smooth roller 24 drives the winding roller 8 to rotate for winding. In the process of moving to the position of the transition mechanism 6, the winding roller 8 continues to reel, the outer diameter of the film roll becomes larger, and the distance between the winding roller 8 and the axial center of the smooth roller 24 becomes farther. In this process, the cylinder 433 pushes the U-shaped platform 52 gradually away from the smooth roller 24, and the pushing speed is adjusted according to the rotation speed of the smooth roller 24 to ensure that the end of the winding roller 8 will not leave the limit of the limit platform 53.

[0037] Combined with Figure 1 , Attachment Figure 6 , Attachment Figure 8 and attached Fig. 9As shown, the frame 1 is provided with a transition mechanism 6 at the inclined surface on the front side of the smooth roller mechanism 2, and the transition mechanism 6 includes a second cylinder 61, an inclined platform 62, a transition platform 63 and a top platform 64. The inclined platform 62 is slidably matched with the inclined surface on the front side of the frame 1, and a second driving plate 621 is provided on the side of the inclined platform 62. The bottom of the second cylinder 61 is fixed to the outside of the frame 1, and the top is connected to the second driving plate 621. A support plate 622 is provided on the inclined platform 62, and the transition platform 63 is slidably arranged on the top inclined surface of the inclined platform 62. The transition platform 63 supports A second spring 623 is provided between the plates 622, a top platform 64 is provided on the transition platform 63 for parallel sliding, a third spring 641 is provided between the top platform 64 and the transition platform 63, a top plate 642 is provided on the side of the top platform 64 close to the roller changing mechanism 3, an oblique insertion platform 624 is provided on the top of the inclined platform 62, and the second cylinder 61 pushes the oblique insertion platform 624 to slide obliquely to the inclined surface of the limiting platform 53, a wheel groove 625 is provided on the inclined platform 62 and the oblique insertion platform 624, and a roller 643 cooperating with the wheel groove 625 is provided at the bottom of the oblique insertion platform 624.

[0038] Working principle of transition mechanism 6: transition mechanism 6 is used for the transition from the end of the winding action of winding roller 8 to the movement to the discharging rack 7. When the winding roller 8 is wound to a certain thickness and moves to the position of transition mechanism 6 with the placement device 5, since the U-shaped platform 52 has been pushed a certain distance, when the placement device 5 moves to the position of transition mechanism 6, the outer side of the U-shaped platform 52 contacts the top of the frame 1 to prevent the placement device 5 from moving too much. Then, cylinder 2 61 pushes the inclined platform 62 to move obliquely upward through driving plate 2 621, and the oblique insertion platform 624 at the end moves to the front of the U-shaped platform 52. When the winding roller 8 continues to wind, the U-shaped platform 52 moves to the transition mechanism 6 position. The transition mechanism 6 moves in the direction of rotation. After the U-shaped platform 52 moves to the top of the column frame 51, the winding roller 8 continues to move. After being free from the limit position of the limit platform 53, the end of the winding roller 8 moves to the inclined insertion platform 624. At this time, the top plate 642 presses against the end of the winding roller 8, giving pressure to the winding roller 8 so that the film roll on it is close to the smooth roller 24. The winding roller 8 continues to move to compress the spring three 641. After the end of the winding roller 8 moves to the inclined surface position of the inclined platform 62, the gravity of the winding roller 8 and the reaction force of the smooth roller 24 push the winding roller 8 and the transition platform 63 to move downward along the inclined surface of the inclined platform 62, compressing the spring two 623.

[0039] After the film roll reaches a certain thickness, the film roll is cut and the roller changing operation is performed. At this time, the cylinder 2 61 drives the inclined table 62 to move downward, so that the winding roller 8 moves from the transition mechanism 6 to the discharge rack 7, and the placer 5 at the position of the transition mechanism 6, the cylinder 1 433 drives the U-shaped table 52 to reset, so that the outer side of the U-shaped table 52 leaves the frame 1, and the positioning groove 512 of the placer 5 is fully opened, and the roller changing operation can be performed through the positioning plate 14, and then the shifting mechanism 4.

[0040] Combined with Figure 1 and attached Fig.10As shown, the frame body 1 is provided with a discharge rack 7 on the front side of the smooth roller mechanism 2, an arc frame 71 is provided on the top of the discharge rack 7, and a blocking column 72 is provided at the bottom of the arc frame 71. The arc surface of the arc frame 71 intersects with the moving curve of the winding roller 8 on the transition mechanism 6. At the intersection, the winding roller 8 moves from the transition mechanism 6 to the arc frame 71.

[0041] Working principle of the discharge rack 7: When the winding roller 8 moves downward with the inclined platform 62 and reaches the intersection position, the winding roller 8 is supported by the arc frame 71 and gradually separates from the top plate 642, and is completely supported by the arc frame 71. The winding roller 8 rolls freely along the arc surface of the arc frame 71 and stops when blocked by the blocking column 72. At this time, the winding roller 8 is hoisted out.

[0042] Combined with Figure 2 , Attachment Figure 7 , Attachment Fig. 9 and attached Fig.11 As shown, the winding roller 8 includes a roller body 81, on which a winding drum 82 is sleeved, the surface of the winding drum 82 is sticky, shaft sleeves 83 are rotatably provided at both ends of the roller body 81, and positioning ring plates 84 are provided on both sides of the shaft sleeve 83, the shaft sleeve 83 is in contact with the support platform 522, the limit platform 53, and the top plate 642, the support platform 522, the limit platform 53, and the top plate 642 are arranged between the two positioning ring plates 84, and the frame body 1 is provided with a placing table 13 on the rear side of the smooth roller mechanism 2, the placing table 13 is in contact with the shaft sleeve 83, and the placing table 13 is arranged between the two positioning ring plates 84.

[0043] The working principle of the winding roller 8 is as follows: the winding roller 82 is sleeved on the roller body 81, and then glue is applied to the winding roller 82 or the adhesive side of the tape is wound around the winding roller 82 with the adhesive side facing outward, and then the winding roller 8 is placed on the placement table 13, so that the placement table 13 is stuck between the positioning ring plates 84 for easy installation. When the winding roller 8 is installed, the winding roller 8 on the placement table 13 is pushed. Due to the guidance of the placement table 13, the shaft sleeve 83 at the end of the winding roller 8 will easily get stuck in the position of the limit table 53 and the support table 522. In the process of the winding roller 8 moving with the placement device 5 and transferring to the transition mechanism 6, due to the cooperation of the positioning ring plate 84 with the support table 522, the limit table 53 and the top plate 642, the winding roller 8 will not move axially during the movement, thereby ensuring the alignment of the edges of the film roll.

[0044] When the present invention is implemented, the winding roller 8 is placed on the placement table 13. After the roller changing operation is performed, the winding roller 8 is pushed into the placement device 5. The winding roller 8 moves to the top with the placement device 5. When the roller is changed next time, the rolled packaging bag is cut off. Then the U-shaped table 52 drives the winding roller 8 to be close to the smooth roller 24. The smooth roller 24 drives the roller body 81 and the winding drum 82 to rotate. The winding drum 82 will adhere to the packaging bag and automatically rewind. After the next roller changing operation, the winding roller 8 moves to the position of the transition mechanism 6 with the placement device 5. During the winding process of the winding roller 8, the winding roller 8 moves from the placement device 5 to the transition mechanism 6. Before the next roller changing operation, the rolled packaging bag is cut off, and the inclined table 62 moves down to move the winding roller 8 to the discharge rack 7. Each roller changing operation is accompanied by the switching of different operating states of the three winding rollers 8, so as to realize the roller changing action of continuous winding operation without stopping the machine.

[0045] The present invention and its embodiments are described above, which is not restrictive. The drawings show only one embodiment of the present invention, and the actual structure is not limited thereto. In short, if ordinary technicians in the field are inspired by it and do not deviate from the purpose of the invention, they can creatively design a structure and embodiment similar to the technical solution, which should fall within the protection scope of the present invention.

Claims

1. An automatic rewinding device for packaging bag film rolls, comprising a frame (1) and a winding roller (8), wherein the frame (1) is provided with a workbench (12) at the film roll input end, two guide rollers (11) are rotatably provided at the bottom of the workbench (12), and a tensioning mechanism (9) and a smooth roller mechanism (2) are provided inside the frame (1), characterized in that: The smooth roller mechanism (2) comprises a motor 1 (21), a reduction gearbox (22), a smooth roller (24) and a side frame (26); the smooth roller (24) is rotatably arranged on the side frame (26); the output end of the motor 1 (21) is connected to the reduction gearbox (22); the output end of the reduction gearbox (22) drives the smooth roller (24) to rotate via a sprocket structure; a guide roller 2 (27) is rotatably arranged between the two side frames (26); the guide roller 2 (27) is closely attached to the smooth roller (24); Roller changing mechanisms (3) are provided on both sides of the smooth roller mechanism (2). The roller changing mechanism (3) includes a displacement mechanism (4) and a placement device (5). The displacement mechanism (4) includes a second motor (41), a drive shaft (42) and a turntable (43). The second motor (41) drives the drive shaft (42) to rotate. The two ends of the drive shaft (42) respectively drive two turntables (43) to rotate on the outside of the side frame (26) through a pulley structure. Four mounting platforms (432) are evenly arranged on the side of the turntable (43). The placement device (5) is mounted on the mounting platform (432). The winding roller (8) is mounted on the placement devices (5) corresponding to the turntables (43) on both sides. The winding roller (8) is in transmission cooperation with the smooth roller (24) through film roll contact. The placing device (5) comprises a column frame (51) and a U-shaped platform (52), wherein the U-shaped platform (52) is slidably arranged on the inner side of the column frame (51), a driving plate (521) is arranged on one side of the U-shaped platform (52), a cylinder (433) is fixed on the mounting platform (432), an output end of the cylinder (433) is connected to the bottom of the driving plate (521), a supporting platform (522) cooperating with the winding roller (8) is arranged on the U-shaped platform (52), a limiting platform (53) is slidably arranged at the inner through hole of the U-shaped platform (52), a spring (531) connected to the U-shaped platform (52) is arranged at the rear side of the limiting platform (53), a positioning column (523) slidably cooperating with the groove at the rear side of the limiting platform (53) is arranged at the inner through hole of the U-shaped platform (52), and the limiting platform (53) cooperates with the supporting platform (522) to fix the winding roller (8) on the U-shaped platform (52); The frame (1) is provided with a transition mechanism (6) at the inclined surface on the front side of the smooth roller mechanism (2), and the transition mechanism (6) includes a second cylinder (61), an inclined platform (62), a transition platform (63) and a top platform (64). The inclined platform (62) is slidably matched with the inclined surface on the front side of the frame (1), and a second drive plate (621) is provided on the side of the inclined platform (62). The bottom of the second cylinder (61) is fixed to the outside of the frame (1), and the top is connected to the second drive plate (621). The inclined platform (62) is provided with a support plate (622), the transition platform (63) is slidably arranged on the top inclined surface of the inclined platform (62), a second spring (623) is arranged between the support plate (622) of the transition platform (63), a top platform (64) is slidably arranged on the transition platform (63), a third spring (641) is arranged between the top platform (64) and the transition platform (63), and a top plate (642) is arranged on the side of the top platform (64) close to the roller changing mechanism (3); The top of the inclined platform (62) is provided with an inclined insertion platform (624), and the second cylinder (61) pushes the inclined insertion platform (624) to slide obliquely to the inclined surface of the limiting platform (53). The inclined platform (62) and the inclined insertion platform (624) are provided with wheel grooves (625), and the bottom of the top plate (642) is provided with rollers (643) that cooperate with the wheel grooves (625).

2. The automatic film rewinding device for packaging bags according to claim 1, characterized in that: The frame body (1) is provided with a discharging frame (7) on the front side of the smooth roller mechanism (2), a curved frame (71) is provided on the top of the discharging frame (7), and a blocking column (72) is provided at the bottom of the curved frame (71) of the discharging frame (7), and the winding roller (8) is moved to the curved frame (71) by the transition mechanism (6).

3. The automatic film rewinding device for packaging bags according to claim 1, characterized in that: The winding roller (8) comprises a roller body (81), a winding drum (82) is sleeved on the roller body (81), the surface of the winding drum (82) is sticky, shaft sleeves (83) are rotatably provided at both ends of the roller body (81), positioning ring plates (84) are provided on both sides of the shaft sleeve (83), the shaft sleeve (83) is in contact with and cooperates with a support platform (522), a limit platform (53), and a top plate (642), and the support platform (522), the limit platform (53), and the top plate (642) are arranged between the two positioning ring plates (84).

4. The automatic film rewinding device for packaging bags according to claim 3, characterized in that: The frame body (1) is provided with a placement platform (13) at the rear side of the smooth roller mechanism (2); the placement platform (13) is in contact with the shaft sleeve (83); and the placement platform (13) is arranged between two positioning ring plates (84).

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