A structure of unwinding mechanism of automatic rewinding device for cast film

Abstract

The utility model discloses a kind of unwinding mechanism structure of automatic rewinding device of cast film, including cylinder, unwinding shaft, unwinding center shaft and compression wheel plate, the output end of cylinder is fixedly installed with rack, the outside of unwinding shaft is connected with the rewinding mother roll to be installed;Piston rod is in the state of back retraction when cylinder set works, so that the rewinding mother roll to be closely adheres to external unwinding power roller, to facilitate the driving force to the rewinding mother roll to be applied to external, to carry out subsequent rewinding to the rewinding mother roll, this adhering state can make the rotation torque of external unwinding power roller be transmitted to the rewinding mother roll to be by friction, provide stable driving force for the unwinding of rewinding mother roll, compared with traditional active unwinding structure, the design can be automatically adjusted adhering pressure according to the roll diameter variation of rewinding mother roll, avoid driving force deficiency or skidding due to rewinding mother roll diameter reduction, ensure that the tension of material is uniform in rewinding process, reduce the risk of material wrinkle or breakage.

Description

Technical Field

[0001] This utility model relates to the field of cast film production technology, specifically to the unwinding mechanism structure of an automatic rewinding device for cast film. Background Technology

[0002] In the field of cast film production and processing, the rewinding process is a crucial link in ensuring product quality and achieving large-scale production. The unwinding mechanism, as a core component of the rewinding device, directly affects the efficiency of cast film rewinding and the quality of the finished product due to its operational stability and adjustment flexibility. Currently available automatic rewinding devices for cast film have gradually revealed numerous technical defects in practical applications, making it difficult to meet diverse production needs and high-efficiency operation standards.

[0003] Existing unwinding mechanisms mostly employ an open installation structure for the unwinding shaft, lacking precise guidance and positioning, and stable limiting design. Installation requires multiple people to align the unwinding shaft and unwinding arm interface, which is not only cumbersome and time-consuming, but also prone to shaft misalignment due to vibration after installation, leading to problems such as deviation and wrinkling during the unwinding of the cast film. While some mechanisms do have limiting components, the adjustment of the limiting screws lacks torque standards and horizontal calibration benchmarks, easily resulting in situations where the limit is too loose, causing the unwinding shaft to move, or too tight, causing damage to components, severely affecting the operational stability of the unwinding mechanism. Utility Model Content

[0004] The purpose of this invention is to provide an unwinding mechanism structure for an automatic rewinding device for cast film, so as to solve the problems mentioned in the background art.

[0005] To achieve the above objectives, this utility model provides the following technical solution: an unwinding mechanism structure for an automatic rewinding device for cast film, comprising a cylinder, an unwinding shaft, an unwinding center shaft, and a pressure roller plate. A rack is fixedly installed at the output end of the cylinder. A master roll to be rewound is wound around the outer side of the unwinding shaft. Two unwinding arms are symmetrically fixedly installed on the outer side of the unwinding center shaft. Unwinding shaft limiting screws are threadedly connected to the outer side of the two unwinding arms away from the unwinding center shaft. Fixed clamps are installed on the outer sides of both ends of the unwinding center shaft. A worm gear is fixedly installed at one end of the unwinding center shaft. A connecting bearing meshes with the outer side of the worm gear. A sector gear is sleeved at the end of the unwinding center shaft away from the worm gear. A tensioning sleeve is installed between the unwinding center shaft and the sector gear. A pressure roller is rotatably installed on one side of the pressure roller plate.

[0006] Preferably, the unwinding shaft is rotatably mounted inside the unwinding arm at the end away from the unwinding center shaft.

[0007] Preferably, the outer side of the sector gear meshes with the outer side of the rack.

[0008] Preferably, a fixing seat is sleeved on the outer side of both ends of the connecting bearing, and a worm gear is installed on the outer side of each fixing seat.

[0009] Preferably, bearings with seats are installed on the outer sides of both ends of the unwinding center shaft.

[0010] Preferably, a handwheel is fixedly installed at one end of the connecting bearing.

[0011] Compared with the prior art, the beneficial effects of this utility model are as follows: when the piston rod of the cylinder is working, it is in a retracting state, so that the master roll to be rewound is tightly attached to the external unwinding power roller, which facilitates the application of driving force to the outside of the master roll to be rewound, thereby enabling subsequent rewinding of the master roll to be rewound. This contact state allows the rotational torque of the external unwinding power roller to be transmitted to the master roll to be rewound through friction, providing a stable driving force for the unwinding of the master roll to be rewound. Compared with the traditional active unwinding structure, this design can automatically adjust the contact pressure according to the change of the diameter of the master roll to be rewound, avoiding insufficient driving force or slippage due to the reduction of the diameter of the master roll to be rewound, ensuring uniform tension of the material during the rewinding process, and reducing the risk of material wrinkling or breakage. In addition, during use, the cylinder can be activated to retract, thereby moving the pressure roller and driving the sector gear to rotate, which in turn drives the unwinding center shaft to rotate, bringing the mother roll to be rewound closer to the external unwinding power roller. This allows for unwinding of mother rolls of different diameters, ensuring that the mother roll to be rewound always maintains the optimal contact distance with the unwinding power roller. This adjustment process is automatically controlled and requires no manual intervention. It can respond in real time to changes in the diameter of the mother roll to be rewound, thereby improving rewinding efficiency. Alternatively, turning the handwheel clockwise will cause the unwinding arm to rotate counterclockwise around the unwinding center axis, moving the mother roll to be rewound away from the external unwinding power roller. Conversely, turning it clockwise will move the mother roll to be rewound closer to the external unwinding power roller, thus adapting to unwinding mother rolls of different diameters. During handwheel adjustment, it is necessary to rotate slowly, pausing after each certain angle to observe the relative position of the mother roll to be rewound and the external unwinding power roller, ensuring adjustment accuracy and avoiding damage to the mother roll due to collision caused by excessively rapid operation. The width of the unwinding arm can be adjusted, and the two unwinding arms are limited by bearing seats. Adjusting the unwinding arm to the sides increases the width, while adjusting it to the inside decreases the width, thus adapting to unwinding shafts and mother rolls of different widths. Attached Figure Description Figure 1 This is a three-dimensional structural diagram of the present utility model.

[0012] Figure 2 This is a three-dimensional structural schematic diagram of the present invention from another perspective.

[0013] Figure 3 This is a side view of the three-dimensional structure of the present invention.

[0014] In the diagram: 1. Cylinder; 2. Unwinding shaft; 3. Mother roll to be rewound; 4. Unwinding shaft limit screw; 5. Unwinding arm; 6. Worm gear; 7. Fixed seat; 8. Connecting bearing; 9. Worm wheel; 10. Bearing with seat; 11. Handwheel; 12. Unwinding center shaft; 13. Fixed clamp; 14. Tensioning sleeve; 15. Sector gear; 16. Rack; 17. Pressure roller; 18. Pressure roller plate. Detailed Implementation

[0015] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0016] Please see Figures 1-3 This utility model provides a technical solution: an unwinding mechanism structure for an automatic rewinding device for cast film, including a cylinder 1, an unwinding shaft 2, an unwinding center shaft 12, and a pressure plate 18. A rack 16 is fixedly installed at the output end of the cylinder 1. A rewinding mother roll 3 is wound around the outer side of the unwinding shaft 2. Two unwinding arms 5 are symmetrically fixedly installed on the outer side of the unwinding center shaft 12. Unwinding shaft limiting screws 4 are threadedly connected to the outer side of the two unwinding arms 5 away from the unwinding center shaft 12. 2. Fixed clamps 13 are installed on the outer sides of both ends. A worm gear 9 is fixedly installed on one end of the unwinding center shaft 12. A connecting bearing 8 is meshed on the outer side of the worm gear 9. A sector gear 15 is sleeved on the end of the unwinding center shaft 12 away from the worm gear 9. The outer side of the sector gear 15 meshes with the outer side of the rack 16. A tensioning sleeve 14 is installed between the unwinding center shaft 12 and the sector gear 15. A pressure roller 17 is rotatably installed on one side of the pressure roller plate 18. A handwheel 11 is fixedly installed on one end of the connecting bearing 8.

[0017] The working principle of the above technical solution is as follows: First, the unwinding shaft 2 can be installed inside the unwinding arm 5 at the end away from the unwinding center shaft 12. Then, the unwinding shaft limiting screw 4 is rotated to limit the unwinding shaft 2 inside the unwinding shaft limiting screw 4. When the cylinder 1 is working, the piston rod is in a retracting state, so that the mother roll 3 to be rewound is in close contact with the external unwinding power roller, thereby facilitating the application of driving force to the outside of the mother roll 3 to be rewound, thus enabling subsequent rewinding of the mother roll 3. This close contact state allows the rotational torque of the external unwinding power roller to be transmitted to the mother roll 3 to be rewound through friction, thus facilitating the rewinding of the mother roll 3. The unwinding of the rewinding master roll 3 provides a stable driving force. Compared with the traditional active unwinding structure, this design can automatically adjust the bonding pressure according to the change in the diameter of the master roll 3 to be rewound, avoiding insufficient driving force or slippage due to the reduction in the diameter of the master roll 3 to be rewound. This ensures uniform tension of the material during the rewinding process and reduces the risk of material wrinkling or breakage. In addition, during use, the cylinder 1 can be activated to retract, thereby moving the pressure roller 17 to drive the sector gear 15 to rotate, which in turn drives the unwinding center shaft 12 to rotate, bringing the master roll 3 to be rewound closer to the external unwinding power roller, thus achieving... The system adapts to different roll diameters of master rolls during unwinding, ensuring that the master roll 3 to be rewound always maintains the optimal contact distance with the unwinding power roller. This adjustment process is automatically controlled, requiring no manual intervention, and can respond in real time to changes in the diameter of the master roll 3 to be rewound, improving rewinding efficiency. Additionally, if cylinder 1 malfunctions, the tension sleeve 14 can be loosened, disengaging the unwinding center shaft 12 from the sector gear 15. Then, turning the handwheel 11 clockwise causes the unwinding arm 5 to rotate counterclockwise around the unwinding center shaft 12, moving the master roll 3 away from the external unwinding power roller; conversely, turning it clockwise moves the master roll 3 closer to the unwinding power roller. An external unwinding power roller enables the unwinding of the master roll 3 to be rewound to different diameters. During the adjustment process, the handwheel 11 needs to be rotated slowly, pausing after each certain angle to observe the relative position of the master roll 3 to be rewound and the external unwinding power roller, ensuring adjustment accuracy and avoiding damage to the master roll due to collision caused by excessive operation. The width of the unwinding arm 5 can be adjusted, and the two unwinding arms 5 are limited by the bearing 10. Adjusting the unwinding arm 5 to the sides increases the width, and adjusting the unwinding arm 5 to the inside decreases the width, so as to adapt to the unwinding shaft 2 and the master roll 3 to be rewound to different widths.

[0018] In another implementation scheme, such as Figures 1-3 As shown, fixed seats 7 are fitted onto the outer sides of both ends of the connecting bearing 8, and worm gears 6 are installed on the outer sides of both fixed seats 7. Bearings 10 with seats are installed on the outer sides of both ends of the unwinding center shaft 12.

[0019] The connecting bearing 8 can be installed in the desired position by fixing the base 7, and the unwinding center shaft 12 can be installed in the desired position by installing the bearing 10 with a seat in the desired position. In addition, the pressure roller 17 can be limited by the rack 16.

[0020] Working principle: The connecting bearing 8 can be installed in the required position through the fixed seat 7, and the bearing with a seat 10 can be installed in the required position to realize the installation of the unwinding center shaft 12 in the required position. In addition, the rack 16 can limit the pressure roller 17. First, the unwinding shaft 2 can be installed inside the unwinding arm 5 away from the unwinding center shaft 12. Then, the unwinding shaft limiting screw 4 is rotated to limit the unwinding shaft 2 inside the unwinding shaft limiting screw 4. When the cylinder 1 works, the piston rod is in the retracting state, so that the mother roll to be rewound 3 is in close contact with the external unwinding power roller, thereby facilitating the external application of the mother roll to be rewound 3. The driving force is applied to perform subsequent rewinding of the master roll 3. This bonding state allows the rotational torque of the external unwinding power roller to be transmitted to the master roll 3 through friction, providing a stable driving force for the unwinding of the master roll 3. Compared with the traditional active unwinding structure, this design can automatically adjust the bonding pressure according to the change of the diameter of the master roll 3, avoiding insufficient driving force or slippage due to the reduction of the diameter of the master roll 3, ensuring uniform tension of the material during the rewinding process, and reducing the risk of material wrinkling or breakage. In addition, the cylinder 1 can be activated to retract during use, thereby moving the pressure roller 17 to drive the sector gear 15. The cylinder 1 rotates, thereby driving the unwinding center shaft 12 to rotate, bringing the mother roll 3 to be rewound closer to the external unwinding power roller. This allows for unwinding of mother rolls of different diameters, ensuring that the mother roll 3 to be rewound always maintains the optimal contact distance with the unwinding power roller. This adjustment process is automatically controlled, requiring no manual intervention, and can respond in real time to changes in the diameter of the mother roll 3 to be rewound, improving rewinding efficiency. In addition, when the cylinder 1 is damaged, the tension sleeve 14 can be loosened, disengaging the unwinding center shaft 12 from the sector gear 15. Then, when the handwheel 11 is turned clockwise, the unwinding arm 5 rotates counterclockwise around the unwinding center shaft 12, moving the mother roll 3 away from the unwinding power roller. The external unwinding power roller moves the rewinding master roll 3 closer to the external unwinding power roller, thus adapting to different roll diameters of the rewinding master roll 3. The handwheel 11 needs to be rotated slowly during adjustment, pausing after each certain angle to observe the relative position of the rewinding master roll 3 and the external unwinding power roller, ensuring adjustment accuracy and avoiding damage to the master roll due to collision caused by excessive operation. The width of the unwinding arm 5 can be adjusted, and the two unwinding arms 5 are limited by the bearing 10. Adjusting the unwinding arm 5 to the sides increases the width, and adjusting the unwinding arm 5 to the inside decreases the width, thus adapting to different widths of the unwinding shaft 2 and the rewinding master roll 3.

[0021] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A structure for the unwinding mechanism of an automatic rewinding device for cast film, comprising a cylinder (1), an unwinding shaft (2), an unwinding center shaft (12), and a pressure roller plate (18), characterized in that: A rack (16) is fixedly installed at the output end of the cylinder (1). A rewinding mother roll (3) is wound around the outside of the unwinding shaft (2). Two unwinding arms (5) are fixedly installed symmetrically on the outside of the unwinding center shaft (12). The unwinding shaft limit screw (4) is threadedly connected to the outside of the two unwinding arms (5) away from the unwinding center shaft (12). Fixed clamps (13) are installed on the outside of both ends of the unwinding center shaft (12). A worm gear (9) is fixedly installed at one end of the unwinding center shaft (12). A connecting bearing (8) meshes with the outside of the worm gear (9). A sector gear (15) is sleeved on the end of the unwinding center shaft (12) away from the worm gear (9). A tensioning sleeve (14) is installed between the unwinding center shaft (12) and the sector gear (15). A pressure roller (17) is rotatably installed on one side of the pressure roller plate (18).

2. The unwinding mechanism structure of the automatic rewinding device for cast film according to claim 1, characterized in that: The unwinding shaft (2) is rotatably mounted inside the unwinding arm (5) at the end away from the unwinding center shaft (12).

3. The unwinding mechanism structure of an automatic rewinding device for cast film according to claim 2, characterized in that: The outer side of the sector gear (15) meshes with the outer side of the rack (16).

4. The unwinding mechanism structure of an automatic rewinding device for cast film according to claim 3, characterized in that: A fixed seat (7) is fitted on the outer side of both ends of the connecting bearing (8), and a worm gear (6) is installed on the outer side of each fixed seat (7).

5. The unwinding mechanism structure of an automatic rewinding device for cast film according to claim 4, characterized in that: The outer sides of both ends of the unwinding center shaft (12) are equipped with seated bearings (10).

6. The unwinding mechanism structure of an automatic rewinding device for cast film according to claim 5, characterized in that: A handwheel (11) is fixedly installed at one end of the connecting bearing (8).

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