Automatic roll changing and winding device and film blowing machine

Abstract

The invention relates to the technical field of film winding, in particular to an automatic roll changing and winding device and a film blowing machine. The automatic roll changing and winding device comprises a machine table and a side plate fixed to the machine table, a rotating rod is rotationally installed on the side plate, and a guide roller is fixed to the rotating rod; the supporting roll changing mechanism is arranged on the rotating rod and used for bearing a winding roller used for roll changing, and supporting plates which are symmetrically arranged are connected to the supporting roll changing mechanism; the deflection cutting mechanism is arranged on the supporting plate, a cutting knife is connected to the deflection cutting mechanism, a follow-up regulation and control mechanism connected with the deflection cutting mechanism is arranged on the rotating rod, and when the rotating rod rotates, the follow-up regulation and control mechanism can regulate the cutting angle of the cutting knife through the deflection cutting mechanism. When cutting and roll changing are carried out, it is guaranteed that a notch of a cut film is in an approximately flat state, and therefore the uniformity of follow-up rolling is guaranteed.

Description

Technical Field

[0001] This invention relates to the field of film winding technology, specifically to an automatic roll-changing and winding device and a blown film machine. Background Technology

[0002] The blown film machine is one of the most important types of plastic machinery, used to produce plastic films. Its working principle is to heat and melt plastic granules, extrude them through a ring die to form a tubular preform, then blow air into the preform to make it expand, stretch, cool and set like a balloon, and finally pull and wind it into a film roll.

[0003] During the film winding process, it is necessary to ensure that the film is wound flat, tightly and neatly into a large roll, with uniform and moderate internal tension, to avoid quality problems such as wrinkles, fraying, cracking, and curling edges.

[0004] Existing film winding is operated by a winding machine. When the winding roller on the winding machine reaches the maximum winding amount, the new winding roller is controlled to move to the winding position, the winding roller stops rotating, and the film is cut. After cutting, the film in a suspended state is guided to wind onto the new winding roller and the winding continues. However, this method requires stopping the machine when changing rolls. Since the blown film machine itself is in continuous production, this will cause the newly generated film to stack on each other during the roll changing process, which will lead to problems such as film collapse and deformation during subsequent winding.

[0005] To address this, a non-stop winding machine can be used for continuous winding. This winding machine guides the new winding roller to the changing position during roll change, and after the film is quickly cut by the cutter, it rebounds due to its own tension and is directly wound onto the new winding roller, thus achieving non-stop roll change and winding. However, since the film is in a stretched winding state throughout the process, the cut end face of the film will inevitably be inclined during the cutting process. When the most protruding part of the inclined end face is wound onto the winding roller, folding is likely to occur. This will lead to uneven winding of the film on the innermost side of the winding roller. As the winding amount increases, the tension is prone to continuous fluctuation during subsequent winding. Summary of the Invention

[0006] The purpose of this invention is to provide an automatic roll-changing and rewinding device and a blown film machine to solve the problems mentioned in the background art.

[0007] To achieve the above objectives, the present invention provides the following technical solution: An automatic roll changing and rewinding device includes: The machine base, and the side plate fixed on the machine base, with a rotating rod rotatably mounted on the side plate, and a guide roller fixed on the rotating rod; Also includes: A winding change mechanism is provided on the rotating rod to support the take-up roller used for winding change. The winding change mechanism is connected to symmetrically arranged support plates. A swing cutting mechanism is mounted on the support plate, a cutting component is connected to the swing cutting mechanism, and a follow-up control mechanism connected to the swing cutting mechanism is mounted on the rotating rod. The follow-up control mechanism includes a conical ring, which is axially slidably mounted on the rotating rod and connected to a centrifugal assembly mounted on the guide roller. When the rotational speed of the rotating rod changes, the conical ring moves toward or away from the guide roller under the action of the centrifugal assembly. The oscillating cutting mechanism includes an oscillating guide rail for receiving the cutting components and a transmission rod connected to the oscillating guide rail. The transmission rod is rotatably connected to the support plate and has a spiral groove formed on it. It also includes an elastic sliding member that can slide in a vertical direction. The elastic sliding member abuts against the conical ring and maintains a rolling engagement state. The elastic sliding member is sleeved on the transmission rod, and the limiting block formed on the inner side of the elastic sliding member slides and engages with the spiral groove.

[0008] As a further embodiment of the present invention: the support roll changing mechanism includes a rotating disk rotatably mounted on the rotating rod and symmetrically arranged, a fixed baffle fixed on the rotating disk, and a movable baffle cooperating with the fixed baffle rotatably mounted on the rotating disk.

[0009] As a further embodiment of the present invention: the support roll changing mechanism further includes a hollow plate fixed on the rotating disk and fixedly connected to the support plate, a plurality of air nozzles evenly distributed on the hollow plate, and a support roller fixed on the hollow plate.

[0010] As a further embodiment of the present invention: an arc groove is formed on the support plate, and a support column that slides and engages with the arc groove is fixed on the sway guide rail.

[0011] As a further embodiment of the present invention: the elastic sliding member includes a guide sleeve and a movable sleeve on which the limiting block is formed, the guide sleeve and the movable sleeve are fixed together by a connecting plate, and a limiting wheel that rolls with the conical ring is rotatably mounted on the connecting plate; The guide sleeve is fitted onto the guide post fixed on the support plate, and the movable sleeve is fitted onto the transmission rod; A third spring is respectively fitted on the transmission rod and the guide column. The two ends of one of the third springs abut against the support plate and the guide sleeve, respectively, and the two ends of the other third spring abut against the support plate and the movable sleeve, respectively.

[0012] As a further embodiment of the present invention: the centrifugal assembly includes a plurality of grooves formed on the side end of the guide roller and distributed circumferentially, and a sliding block is slidably installed in the groove.

[0013] As a further embodiment of the present invention: a hinge rod is hinged to the sliding block and hinged to the conical ring, and a second spring is sleeved on the rotating rod, with the two ends of the second spring abutting against the conical ring and the guide roller respectively.

[0014] As a further embodiment of the present invention: the machine base is provided with a limiting component for limiting the position of the take-up roller. The limiting component includes a fixed plate fixed on the bracket, a movable rod slidably mounted on the fixed plate, a limiting ring and a limiting plate respectively fixed at both ends of the movable rod, the limiting ring abutting against the fixed plate, the limiting plate cooperating with the side plate to form a sliding channel, and a first spring sleeved on the movable rod, the two ends of the first spring abutting against the fixed plate and the limiting plate respectively.

[0015] A blown film machine includes the aforementioned automatic roll changing and rewinding device.

[0016] Compared with the prior art, the beneficial effects of the present invention are: the present invention can guide the new take-up roller to the position of cooperating with the guide roller by supporting the take-up roller when changing the roll without stopping the machine. After the cutting is completed, the film automatically moves towards the take-up roller due to tension rebound. At the same time, under the action of the air blown by the air nozzle, the free suspension section of the film that is partially overlapped due to the rebound is blown into a fully open state and wrapped around the take-up roller. In this way, after the film is cut, the film can be continuously wound up by the air blowing adhesion method. After the roll change is completed, and as the traction take-up roller moves, the limiting component can provide sufficient downward pressure to the take-up roller and keep the provided downward pressure within a constant range. This ensures that the limiting plate can automatically move aside as the take-up roller's winding amount gradually increases, preventing interference with the movement of the take-up roller, and also prevents the normal winding of the film from being affected by excessive support force provided to the take-up roller.

[0017] The follow-up control mechanism can control the movement of the skew cutting mechanism according to the winding rate, thereby achieving the effect of adaptive adjustment of the cutting direction of the cutting blade. The cutting blade will cut at an angle to the width of the film, that is, the cutting blade will be displaced in both the horizontal and vertical directions. In this way, it can achieve comprehensive cutting of the film and compensate for the distance traveled by the film while it is in the winding state during the cutting process. This ensures that the cut surface of the film is in a relatively flat state, so that when the film is blown and rewound laterally, the innermost part of the winding will not be uneven due to the angled cut of the film. As winding continues, this unevenness may be amplified, resulting in continuous fluctuation of tension during film winding. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of one embodiment of an automatic roll changing and rewinding device.

[0019] Figure 2 This is a structural schematic diagram from another angle of one embodiment of the automatic roll changing and rewinding device.

[0020] Figure 3 This is a structural diagram of the roll changing state in one embodiment of the automatic roll changing and rewinding device.

[0021] Figure 4 for Figure 3 A magnified schematic diagram of the structure at point A in the middle.

[0022] Figure 5 This is a schematic diagram showing the connection relationship between the guide roller, the support winding mechanism, and the partial sway cutting mechanism in one embodiment of an automatic roll changing and rewinding device.

[0023] Figure 6 This is a schematic diagram of the follow-up control mechanism and the partial swing cutting mechanism in one embodiment of the automatic roll changing and rewinding device.

[0024] Figure 7 This is a schematic diagram of the structure of part of the follow-up control mechanism and part of the swing cutting mechanism in one embodiment of the automatic roll changing and rewinding device.

[0025] Figure 8 This is an exploded structural diagram of a portion of the swaying cutting mechanism in one embodiment of an automatic roll changing and rewinding device.

[0026] Figure 9 This is an exploded structural diagram of part of the follow-up control mechanism in one embodiment of an automatic roll changing and rewinding device.

[0027] Figure 10 This is an exploded structural diagram of part of the support winding mechanism and part of the sway cutting mechanism in one embodiment of an automatic roll changing and rewinding device.

[0028] In the diagram: 1. Machine base; 2. Side plate; 201. Slot; 3. Rotating rod; 4. Guide roller; 401. Slide groove; 5. Rotating disk; 6. Fixed baffle; 7. Movable baffle; 8. Fixed plate; 9. Movable rod; 901. Limiting ring; 10. Limiting plate; 11. First spring; 12. Hollow plate; 13. Air nozzle; 14. Support roller; 15. Support plate; 1501. Arc groove; 16. Transmission rod; 1601. Spiral groove; 17. Skew guide rail; 1701. Support column; 18. Cutting blade; 19. Sliding block; 20. Hinge rod; 21. Conical ring; 22. Second spring; 23. Movable sleeve; 2301. Limiting block; 24. Guide column; 25. Guide sleeve; 26. Third spring; 27. Limiting wheel; 28. Feeding bracket; 29. ​​Cylinder; 30. Connecting plate. Detailed Implementation

[0029] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0030] Furthermore, elements in this invention are referred to as being "fixed to" or "set on" another element, which may be directly on the other element or may also include an intervening element. When an element is considered to be "connected" to another element, it may be directly connected to the other element or may also include an intervening element. The terms "vertical," "horizontal," "left," "right," and similar expressions used herein are for illustrative purposes only and do not represent the only possible implementations.

[0031] Please see Figures 1-10 In this embodiment of the invention, an automatic roll changing and rewinding device includes: The machine base 1 and the side plate 2 fixed on the machine base 1, the side plate 2 is rotatably mounted with a rotating rod 3, and the rotating rod 3 is fixed with a guide roller 4; Also includes: A winding mechanism is provided on the rotating rod 3 to support the winding roller used for winding. A symmetrically arranged support plate 15 is connected to the winding mechanism. A swing cutting mechanism is provided on the support plate 15. A cutting component is connected to the swing cutting mechanism. A follow-up control mechanism connected to the swing cutting mechanism is provided on the rotating rod 3. The follow-up control mechanism includes a conical ring 21, which is axially slidably mounted on the rotating rod 3 and connected to a centrifugal assembly mounted on the guide roller 4. When the rotation speed of the rotating rod 3 changes, the conical ring 21 moves toward or away from the guide roller 4 under the action of the centrifugal assembly. The oscillating cutting mechanism includes an oscillating guide rail 17 for receiving the cutting components and a transmission rod 16 connected to the oscillating guide rail 17. The transmission rod 16 is rotatably connected to the support plate 15 and a spiral groove 1601 is formed on the transmission rod 16. It also includes an elastic sliding member that can slide in the vertical direction. The elastic sliding member abuts against the conical ring 21 and maintains a rolling engagement state. The elastic sliding member is sleeved on the transmission rod 16 and the limiting block 2301 formed on the inner side of the elastic sliding member slides into the spiral groove 1601.

[0032] A feeding bracket 28 is rotatably mounted on the machine base 1, and a cylinder 29 is fixed on the machine base 1 and hinged to the feeding bracket 28.

[0033] Specifically, the cutting assembly includes a cutting blade 18 that slides along the length of the sway guide 17, and an electromagnetic structure integrated within the sway guide 17. This electromagnetic structure generates electromagnetic force to drive the cutting blade 18 to perform a rapid cutting action radially along the sway guide 17. During film production in the blown film machine, to ensure continuous production, roll changing is required without stopping the machine. To address this, when the take-up roller on the feeding bracket 28 reaches the set take-up amount, the support roll changing mechanism moves and pulls the film placed on the guide roller 4. Simultaneously, the support roll changing mechanism also supports the new take-up roller. When the support roll changing mechanism moves to the required roll changing position, the new take-up roller abuts against the guide roller 4, and under friction, the new take-up roller rotates. At the same time, the guide roller 4 drives the follow-up control mechanism to move. The follow-up control mechanism controls the sway guide 18 according to the rotation speed of the guide roller 4, i.e., the film take-up speed. The swing cutting mechanism moves to adjust the cutting angle of the cutting blade 18. At this time, under the action of the swing cutting mechanism, the cutting blade 18 is controlled to move to cut the film. The obliquely moving cutting blade 18 can match the traction speed of the film, so that the cut of the film after being cut by the cutting blade 18 is in a relatively flat state. After the film is cut, under the action of the support roll changing mechanism, the suspended section of the film is blown with air, so that the film is wrapped on a new take-up roller. Under the action of the take-up roller, the film is continuously wound up. Under the action of the cylinder 29, the take-up roller placed on the feeding bracket 28 is driven to move to the unloading position, so that the take-up roller is separated from the feeding bracket 28. The cylinder 29 controls the feeding bracket 28 to reset. At this time, the support roll changing mechanism controls the new take-up roller to overlap the feeding bracket 28 again. The above steps are repeated to realize the non-stop roll changing and winding of the film.

[0034] Please see Figures 1-6 The support and roll changing mechanism includes a rotating disk 5 rotatably mounted on the rotating rod 3 and symmetrically arranged, a fixed baffle 6 fixed on the rotating disk 5, and a movable baffle 7 rotatably mounted on the rotating disk 5 to cooperate with the fixed baffle 6. The support and roll changing mechanism also includes a hollow plate 12 fixed on the rotating disk 5 and fixedly connected to the support plate 15, a plurality of air nozzles 13 equally distributed on the hollow plate 12, and a support roller 14 fixed on the hollow plate 12.

[0035] Please refer to Figures 3-5 The machine base 1 is provided with a limiting component for limiting the position of the take-up roller. The limiting component includes a fixed plate 8 fixed on the machine base 1. A movable rod 9 is slidably installed on the fixed plate 8. A limiting ring 901 and a limiting plate 10 are respectively fixed at both ends of the movable rod 9. The limiting ring 901 abuts against the fixed plate 8. The limiting plate 10 cooperates with the side plate 2 to form a sliding channel. A first spring 11 is sleeved on the movable rod 9. The two ends of the first spring 11 abut against the fixed plate 8 and the limiting plate 10 respectively.

[0036] Please see Figure 3 In detail, a slot 201 is formed on the side plate 2. The slot 201 is set in an arc-shaped recess, and the arc size matches the rotating shaft of the take-up roller. A torsion spring is installed on the rotating shaft of the movable baffle 7. Under the action of the torsion spring, the distance between the movable baffle 7 and the fixed baffle 6 is minimized. At this time, a support slot that cooperates with the take-up roller is formed between the movable baffle 7 and the fixed baffle 6. The distance from the extended end of the movable baffle 7 to the center axis of the rotating disk 5 is greater than the distance from the extended end of the fixed baffle 6 to the center axis of the rotating disk 5. Please see Figure 3 The limiting plate 10 can be divided into two sections: an inclined section and an arc section. The inclined section has a certain angle with the corresponding side plate 2 below, while the arc radius of the arc section is greater than the arc radius of the corresponding side plate 2 below. Therefore, the sliding channel formed between the limiting plate 10 and the side plate 2 can also be divided into an inclined section and an arc section. Starting from the side facing the slot 201, the size of the starting position is the smallest and slightly smaller than the size of the winding roller shaft. The size of the sliding channel gradually increases away from the starting position. In the initial state, the limiting plate 10 is located at the end of its stroke on the side away from the fixed plate 8, that is, the distance between the limiting plate 10 and the fixed plate 8 is the largest, so that the limiting ring 901 and the fixed plate 8 are in abutting state. The extension of the first spring 11 in its natural state is greater than the maximum distance between the limiting plate 10 and the fixed plate 8. Therefore, the first spring 11 is in a pre-compressed state and always provides the limiting plate 10 with a thrust in the direction away from the fixed plate 8. Under the action of the rotating disk 5, the hollow plate 12 is located slightly below the guide roller 4. Therefore, the support roller 14 is in a separated state from the film.

[0037] Two motors are installed on the machine base 1. One motor drives the rotating rod 3 to rotate via a belt, and the other motor drives the rotating disk 5 to rotate via a belt. When it is necessary to change the roll, the rotating disk 5 is controlled to rotate under the action of the motor, thereby driving the fixed baffle 6, the movable baffle 7, and the hollow plate 12 to move. The hollow plate 12 also drives the support roller 14 to move. Under the action of the support roller 14, the film attached to the guide roller 4 is pulled onto the support roller 14. Since the extension of the movable baffle 7 is greater than that of the fixed baffle 6, the fixed baffle 6 will not contact the take-up roller when it passes over the take-up roller placed on the slot 201. When the movable baffle 7 moves to the position of contacting the take-up roller, the guide take-up roller is disengaged from the slot 201 and enters the support groove formed between the movable baffle 7 and the fixed baffle 6. When the take-up roller moves to the contact position with the limiting plate 10, since the end of the limiting plate 10 is set in an inclined position, the limiting plate 10 will give way and move away from the side plate 2, so as to drive the movable rod 9 to move, thereby compressing the first spring 11. Under the action of the first spring 11, the take-up roller is always subjected to a certain downward pressure. When the take-up roller moves to the vertical center reference plane of the guide roller 4, the rotating disk 5 stops rotating. At this time, the take-up roller and the film on the guide roller 4 are closely attached, and under the action of friction, the take-up roller rotates. In this state, the film passes through the contact position between the guide roller 4 and the take-up roller in sequence, and after passing through the support roller 14, it is wound up by the take-up roller placed on the feeding bracket 28. When the take-up roller placed on the feeding bracket 28 reaches its maximum take-up amount, the film is cut under the action of the sway cutting mechanism. At the same time, air is sent into the hollow plate 12 through the conduit, and the gas in the hollow plate 12 will be discharged through the air nozzle 13. Since the film is always in a taut state before the cut is completed, after the cut is completed, the film automatically moves towards the take-up roller due to the tension rebound. Under the action of the air blown by the air nozzle 13, the free suspension section of the film that was partially overlapped due to the rebound is blown into a fully open state and wrapped around the take-up roller. At the same time, since the take-up roller is always rotating, this new take-up roller will continuously wind the film. In this way, after the film is cut, the film can be continuously wound up by the air-blowing adhesion method.

[0038] At this time, under the action of cylinder 29, the feeding bracket 28 is controlled to move away from the guide roller 4 until the feeding bracket 28 separates from the winding roller that has been wound up. At this time, cylinder 29 controls the feeding bracket 28 to reset. During this process, the winding roller located in the support groove is in a continuous winding state. At the same time, the rotating disk 5 will rotate and control the winding roller to gradually move towards the feeding bracket 28 through the support groove. As the winding roller moves along the sliding channel, its circumference radius will gradually increase as the winding roller continues to wind up, and the distance between the winding roller and the rotation center of the guide roller 4 will gradually increase. Since the opening size of the sliding channel gradually increases, the support force provided by the first spring 11 to the winding roller through the limiting plate 10 can be kept within a certain range to a certain extent. In this way, it can be ensured that the limiting plate 10 can automatically move away when the winding amount of the winding roller gradually increases to prevent interference with the movement of the winding roller, and it can also prevent the normal winding of the film from being affected by the excessive support force provided to the winding roller.

[0039] When the take-up roller enters the feed bracket 28, the rotating disk 5 continues to rotate, causing the fixed baffle 6 and the movable baffle 7 to return to their initial positions. During this process, the movable baffle 7 automatically moves aside under the action of the torsion spring to ensure that the movable baffle 7 does not interfere with the take-up roller.

[0040] Please see Figures 1-3 , Figures 5-8 , Figure 10 The elastic sliding member includes a guide sleeve 25 and a movable sleeve 23 on which the limiting block 2301 is formed. The guide sleeve 25 and the movable sleeve 23 are fixed together by a connecting plate 30. A limiting wheel 27 that rolls with the conical ring 21 is rotatably mounted on the connecting plate 30. The guide sleeve 25 is sleeved on the guide post 24 fixed on the support plate 15 and can slide axially relative to the guide post 24; the movable sleeve 23 is sleeved on the transmission rod 16. A third spring 26 is respectively fitted on the transmission rod 16 and the guide column 24. The two ends of one of the third springs 26 abut against the support plate 15 and the guide sleeve 25, respectively, and the two ends of the other third spring 26 abut against the support plate 15 and the movable sleeve 23, respectively.

[0041] See also Figures 1-3 , Figures 5-7 , Figure 9 The centrifugal assembly includes a plurality of grooves 401 formed on the side end of the guide roller 4 and distributed circumferentially. A sliding block 19 is slidably installed in the groove 401. A hinge rod 20 that is hinged to the conical ring 21 is hinged to the sliding block 19. A second spring 22 is sleeved on the rotating rod 3. The two ends of the second spring 22 abut against the conical ring 21 and the guide roller 4, respectively.

[0042] It should be noted that when the take-up roller placed on the feed bracket 28 is about to reach the maximum take-up amount, a new take-up roller needs to be guided to perform the roll change action through the fixed baffle 6 and the movable baffle 7. During the roll change, the film needs to be cut. See also Figure 6 , Figure 7 In the initial state, the rotating rod 3 and the guide roller 4 are stationary. At this time, the sliding block 19 is not subjected to centrifugal force, and the sliding block 19 is located at the end of the stroke of the slide groove 401 in the direction of the central axis of the rotating rod 3. The sliding block 19 will control the conical ring 21 to be located at the end of the stroke away from the guide roller 4 through the hinge rod 20. In this case, the distance between the guide roller 4 and the conical ring 21 is the largest, and the elongation of the second spring 22 in its natural state is greater than the maximum distance between the guide roller 4 and the conical ring 21. In this case, the second spring 22 is in a pre-compressed state and always provides the conical ring 21 with a thrust in the direction away from the guide roller 4. Under the action of the connecting plate 30, the distance between the guide sleeve 25 and the movable sleeve 23 and the support plate 15 is maximized. The elongation of the third spring 26 in its natural state is greater than the maximum distance between the guide sleeve 25 and the support plate 15. Therefore, the third spring 26 always provides the connecting plate 30 with a thrust away from the support plate 15 through the guide sleeve 25 and the movable sleeve 23. At this time, the limiting wheel 27 abuts against the minimum circumferential radius of the conical ring 21. Under the action of the movable sleeve 23, the limiting block 2301 is located at the end of the stroke on one side of the spiral groove 1601. Under the action of the transmission rod 16, the sway guide rail 17 and the support roller 14 are in a parallel state, that is, the cutting direction of the cutting blade 18 is the same as the film width direction. When the film needs to be wound up, the rotating rod 3 will control the winding roller with the film wound on it to rotate via the guide roller 4. When the guide roller 4 rotates, it will generate centrifugal force. Under the action of centrifugal force, the sliding block 19 will slide along the groove 401 at the corresponding distance according to the rotation speed of the guide roller 4. The sliding block 19 will drive the conical ring 21 to move towards the guide roller 4 via the hinge rod 20. Under the action of the conical ring 21, the connecting plate 30 will be controlled to move via the limit wheel 27, thereby controlling the movable sleeve 23 and the guide sleeve 25 to slide along the axial direction of the transmission rod 16 and the guide post 24 respectively, so as to control the third spring 26. During compression, the movable sleeve 23 will also drive the limiting block 2301 to slide along the spiral groove 1601. Under the action of the limiting block 2301 and the spiral groove 1601, the transmission rod 16 will rotate, so that the sway guide rail 17 will sway at a certain angle. The sway guide rail 17 will also drive the support column 1701 to slide along the arc groove 1501. The arc center of the arc groove 1501 coincides with the central axis of the transmission rod 16. Therefore, under the action of the support column 1701 and the arc groove 1501, the sway guide rail 17 can be kept stable when swaying. Under the action of the sway guide rail 17, the cutting direction of the cutting blade 18 will be changed. When the cutting direction of the cutting blade 18 changes, under the electromagnetic action, the cutting blade 18 will cut at an angle to the width of the film. That is, the cutting blade 18 will be displaced in both the horizontal and vertical directions. In this way, the film can be fully cut, and the distance traveled by the film while it is in a winding state during the cutting process can be compensated. This ensures that the cut surface of the film is relatively flat, so that when the film is blown and rewound laterally, the innermost part of the winding will not be uneven due to the angled cut of the film. As winding continues, this unevenness may be amplified, which will cause the tension of the film to fluctuate continuously during winding.

[0043] If the rotation speed of the guide roller 4 increases, i.e. the winding speed increases, the centrifugal force on the sliding block 19 will also increase. This will synchronously drive the conical ring 21 to move a corresponding distance, causing the limiting wheel 27 to move. In response, the position of the limiting block 2301 in the spiral groove 1601 will change adaptively, causing the deflection angle of the transmission rod 16 to change. In this way, the cutting angle of the cutting blade 18 can be adaptively adjusted when the winding speed changes, so as to ensure that the cutting blade 18 can cut the film relatively smoothly at different winding speeds.

[0044] A blown film machine includes the aforementioned automatic roll changing and rewinding device.

[0045] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the invention can be implemented in other specific forms without departing from its spirit or essential characteristics. Therefore, the embodiments should be considered in all respects as exemplary and non-limiting, and the scope of the invention is defined by the appended claims rather than the foregoing description. Thus, all variations falling within the meaning and scope of equivalents of the claims are intended to be included within the present invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

[0046] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. An automatic roll changing and rewinding device, comprising: The machine base, and the side plate fixed on the machine base, with a rotating rod rotatably mounted on the side plate, and a guide roller fixed on the rotating rod; Its characteristic is that it further includes: A winding change mechanism is provided on the rotating rod to support the take-up roller used for winding change. The winding change mechanism is connected to symmetrically arranged support plates. A swing cutting mechanism is mounted on the support plate, a cutting component is connected to the swing cutting mechanism, and a follow-up control mechanism connected to the swing cutting mechanism is mounted on the rotating rod. The follow-up control mechanism includes a conical ring, which is axially slidably mounted on the rotating rod and connected to a centrifugal assembly mounted on the guide roller. When the rotational speed of the rotating rod changes, the conical ring moves toward or away from the guide roller under the action of the centrifugal assembly. The oscillating cutting mechanism includes an oscillating guide rail for receiving the cutting components and a transmission rod connected to the oscillating guide rail. The transmission rod is rotatably connected to the support plate and has a spiral groove formed on it. It also includes an elastic sliding member that can slide in a vertical direction. The elastic sliding member abuts against the conical ring and maintains a rolling engagement state. The elastic sliding member is sleeved on the transmission rod, and the limiting block formed on the inner side of the elastic sliding member slides and engages with the spiral groove.

2. The automatic roll changing and rewinding device according to claim 1, characterized in that, The support roll changing mechanism includes a rotating disk rotatably mounted on the rotating rod and symmetrically arranged, a fixed baffle fixed on the rotating disk, and a movable baffle that cooperates with the fixed baffle rotatably mounted on the rotating disk.

3. The automatic roll changing and rewinding device according to claim 2, characterized in that, The support roll changing mechanism also includes a hollow plate fixed on the rotating disk and fixedly connected to the support plate. Multiple air nozzles are connected to the hollow plate at equal intervals, and a support roller is fixed on the hollow plate.

4. The automatic roll changing and rewinding device according to claim 1, characterized in that, An arc groove is formed on the support plate, and a support column that slides into the arc groove is fixed on the yaw guide rail.

5. An automatic roll changing and rewinding device according to claim 4, characterized in that, The elastic sliding member includes a guide sleeve and a movable sleeve on which the limiting block is formed. The guide sleeve and the movable sleeve are fixed together by a connecting plate. A limiting wheel that rolls with the conical ring is rotatably mounted on the connecting plate. The guide sleeve is fitted onto the guide post fixed on the support plate, and the movable sleeve is fitted onto the transmission rod; A third spring is respectively fitted on the transmission rod and the guide column. The two ends of one of the third springs abut against the support plate and the guide sleeve, respectively, and the two ends of the other third spring abut against the support plate and the movable sleeve, respectively.

6. An automatic roll changing and rewinding device according to claim 1, characterized in that, The centrifugal assembly includes a plurality of grooves formed on the side end of the guide roller and distributed circumferentially, and a sliding block is slidably installed in the groove.

7. An automatic roll changing and rewinding device according to claim 6, characterized in that, The sliding block is hinged to a hinge rod that is hinged to the conical ring, and a second spring is sleeved on the rotating rod. The two ends of the second spring abut against the conical ring and the guide roller, respectively.

8. An automatic roll changing and rewinding device according to claim 1, characterized in that, The machine base is provided with a limiting component for limiting the position of the take-up roller. The limiting component includes a fixed plate fixed on the machine base, a movable rod slidably mounted on the fixed plate, a limiting ring and a limiting plate respectively fixed at both ends of the movable rod, the limiting ring abutting against the fixed plate, the limiting plate cooperating with the side plate to form a sliding channel, and a first spring sleeved on the movable rod, the two ends of the first spring abutting against the fixed plate and the limiting plate respectively.

9. A blown film machine, characterized in that, Includes the automatic roll changing and rewinding device as described in any one of claims 1-8.

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