Automatic change-over rewinder

Abstract

The application discloses an automatic roll changing rewinding machine, which comprises a winding turntable driven to rotate by a driving motor; a plurality of winding rollers are uniformly arranged in a circumferential direction on a disc surface of the winding turntable; the winding turntable is correspondingly divided into a blanking station and a winding station; a cutting mechanism is arranged on a film conveying path between the blanking station and the winding station; an installation support is arranged outside the winding turntable; an auxiliary support is rotatably installed on the installation support; a finished product pressing frame and a roll changing pressing frame are installed on the auxiliary support; a finishing pressing roller is rotatably installed at an end of the finished product pressing frame; and a fixed pressing roller is rotatably installed at an end of the roll changing pressing frame. The roll changing operation is automatically completed through cooperation of the pressing rollers of the auxiliary support and the cutting mechanism, and the two side ends of the film are glued at the same time when the cutting action is completed, so that the additional pretreatment procedures of pre-pasting double-sided adhesive tape and subsequent label pasting and packaging are saved.

Description

Technical Field

[0001] This invention relates to the technical field of thin film processing, and in particular to automatic roll-changing and rewinding machines. Background Technology

[0002] Rewinding machines are widely used in the slitting, winding, and rewinding of strip rolls of film, label paper, and packaging paper. They are one of the core pieces of equipment in the roll material post-processing production line. Their roll changing efficiency and splicing quality directly determine the production efficiency and finished product yield of the entire production line. With the continuous improvement of the demand for automated production, non-stop automatic roll changing has become the mainstream development direction of rewinding equipment, aiming to reduce the auxiliary time of downtime for material changing and improve continuous production capacity.

[0003] Currently, most automatic roll changing and rewinding machines in the industry use labeling and pre-applying double-sided adhesive to achieve the docking and fixing of new and old rolls and the sealing of the end of the roll. For example, Chinese patent CN213201723U discloses a rewinding machine. In the process of switching and fixing the label roll at the station, the machine mainly relies on the labeling device to complete the labeling and sealing of the end of the finished product. Before changing the roll, double-sided adhesive must be applied to the surface of the new roll tube to achieve the bonding and fixing of the film head of the new roll.

[0004] This type of fixing method has obvious drawbacks in actual production: the method of pre-applying double-sided tape to the new roll tube requires additional manual or automated pre-processing steps, which prolongs the roll changeover auxiliary time and directly reduces the overall rewinding production efficiency; moreover, it is difficult to ensure that the double-sided tape is applied in an absolutely precise and uniform position, and deviations in the bonding position can easily lead to uneven roll ends, uneven bonding strength, and uncontrollable finished product quality stability; the traditional matching labeling mechanism has a complex overall structure and a large number of parts, resulting in high daily debugging and maintenance costs, and the labeling and cutting processes are executed independently step by step with large gaps between processes, making it impossible to achieve a quick and seamless connection between new and old rolls, and difficult to adapt to the production needs of high-speed rewinding. Summary of the Invention

[0005] The purpose of this invention is to solve the problems in the prior art by proposing an automatic roll changing and rewinding machine that can solve the above problems.

[0006] To achieve the above objectives, the present invention proposes an automatic roll-changing and rewinding machine, comprising a winding turntable driven by a drive motor; a plurality of winding rollers are evenly arranged circumferentially on the surface of the winding turntable; the winding turntable is correspondingly divided into a feeding station and a winding station, and a cutting mechanism is provided on the film conveying path between the feeding station and the winding station; a mounting bracket is provided on the outer side of the winding turntable, and an auxiliary bracket is rotatably mounted on the mounting bracket, and a finished product pressure frame and a roll-changing pressure frame are mounted on the auxiliary bracket; a sorting pressure roller is rotatably mounted at the end of the finished product pressure frame, and a fixed pressure roller is rotatably mounted at the end of the roll-changing pressure frame.

[0007] Preferably, the cutting mechanism includes an upper pressure frame, an upper pressure plate at the bottom of the upper pressure frame, a cutting blade mounted at the bottom of the upper pressure plate, a cutting cylinder connected to the upper pressure frame, a floating bottom plate below the upper pressure plate, the floating bottom plate and the cutting blade located on opposite sides of the film, a main shaft at the center of the winding turntable, the winding turntable being rotatably mounted on the main shaft, a fixing ring fixedly fitted on the main shaft, the fixing ring not rotating synchronously with the winding turntable, and the fixing ring being connected to the floating bottom plate via a lifting cylinder.

[0008] Preferably, the upper surface of the floating base plate is provided with a cutting groove corresponding to the position of the cutting blade, and a gluing mechanism is provided on both sides of the cutting groove.

[0009] Preferably, the adhesive application mechanism is a spray nozzle; mounting slots are provided on both sides of the knife groove, and a plurality of spray nozzles are evenly distributed in each mounting slot along the film width direction, with the spraying direction of the spray nozzles facing the film side.

[0010] Preferably, the adhesive applicator is a strip-shaped adhesive outlet extending along the film width direction; the floating base plate has an adhesive storage tank inside, which is connected to the strip-shaped adhesive outlet and contains adhesive liquid; the bottom of the adhesive storage tank is provided with a pressing push plate, and the bottom of the floating base plate is fixed with a pressing cylinder, the piston rod of the pressing cylinder extending into the adhesive storage tank and connected to the pressing push plate; the lower surface of the upper pressure plate is provided with strip-shaped pressure strips on both sides corresponding to the positions of the strip-shaped adhesive outlet, and the strip-shaped pressure strips are connected to the upper pressure plate by springs. When the upper pressure plate and the floating base plate are pressed together, the strip-shaped pressure strips press against the outer edge area of ​​the strip-shaped adhesive outlet to prevent adhesive liquid from overflowing.

[0011] Preferably, each of the take-up rolls is equipped with an independent take-up motor to drive its rotation.

[0012] The beneficial effects of this invention are as follows: This invention automatically completes the roll changing operation by cooperating with the pressure rollers of the auxiliary support and the cutting mechanism. While completing the cutting action, adhesive is applied to both ends of the film, eliminating the extra pre-processing steps of pre-applying double-sided tape and subsequent labeling and packaging, significantly shortening the roll changing auxiliary time and effectively improving the production efficiency of continuous rewinding of the whole machine. The adhesive application position is preset at a fixed position on both sides of the knife groove, and the adhesive is evenly extruded along the narrow slit. The relative distance between the adhesive application position and the cutting edge is constant, eliminating the problem of adhesive spraying deviation. The bonding position is precise and controllable, and the bonding strength and end face neatness of the finished roll are more stable. The method of using a push plate to extrude adhesive is especially suitable for high viscosity adhesives, fundamentally avoiding the problem of adhesive drying and clogging. The overall structure is simplified and the maintenance cost is low. At the same time, the adhesive outlet, together with the pressure strip, forms a limited area, so that the adhesive is evenly spread and does not easily spread outwards and overflow. This ensures both the precise fixation of the adhesive application position and the bonding strength, and effectively avoids adhesive contamination of the film surface and equipment parts.

[0013] The features and advantages of the present invention will be described in detail through embodiments and in conjunction with the accompanying drawings. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the structure of the present invention; Figure 2 This is a schematic diagram of the cutting process of the present invention; Figure 3 This is a schematic diagram of the floating bottom plate structure of the present invention; Figure 4 This is a schematic diagram of the working of the strip pressing strip of the present invention; Figure 5 This is a schematic diagram of the upper pressure frame of the present invention.

[0015] In the diagram: 1. Rewind turntable; 2. Rewind roller; 3. Cutting mechanism; 4. Mounting bracket; 5. Auxiliary bracket; 6. Cutting knife; 7. Upper pressure frame; 8. Upper pressure plate; 9. Floating base plate; 11. Unloading station; 12. Rewinding station; 13. Main shaft; 14. Fixing ring; 15. Lifting cylinder; 51. Finished product pressure frame; 52. Roll changing pressure frame; 53. Finishing pressure roller; 54. Fixed pressure roller; 81. Strip pressure strip; 82. Spring; 90. Knife groove; 91. Glue storage tank; 92. Strip glue outlet; 93. Extrusion push plate; 94. Extrusion cylinder. Detailed Implementation

[0016] Example 1 See Figures 1 to 5An automatic roll-changing and rewinding machine includes a take-up turntable 1, which is driven to rotate by a drive motor; a plurality of take-up rollers 2 are evenly arranged around the circumference of the turntable 1; the take-up turntable 1 is correspondingly divided into a feeding station 11 and a take-up station 12, and a cutting mechanism 3 is provided on the film conveying path between the feeding station 11 and the take-up station 12; a mounting bracket 4 is provided on the outer side of the take-up turntable 1, and an auxiliary bracket 5 is rotatably mounted on the mounting bracket 4; a finished product pressure frame 51 and a roll-changing pressure frame 52 are mounted on the auxiliary bracket 5; a sorting pressure roller 53 is rotatably mounted at the end of the finished product pressure frame 51, and a fixed pressure roller 54 is rotatably mounted at the end of the roll-changing pressure frame 52.

[0017] The cutting mechanism 3 includes an upper pressure frame 7, an upper pressure plate 8 at the bottom of the upper pressure frame 7, a cutting blade 6 mounted at the bottom of the upper pressure plate 8, a cutting cylinder connected to the upper pressure frame 7, a floating bottom plate 9 below the upper pressure plate 8, the floating bottom plate 9 and the cutting blade 6 located on opposite sides of the film, a main shaft 13 at the center of the winding turntable 1, the winding turntable 1 being rotatably mounted on the main shaft 13; a fixing ring 14 is fixedly fitted on the main shaft 13, the fixing ring 14 not rotating synchronously with the winding turntable 1, and the fixing ring 14 being connected to the floating bottom plate 9 via a lifting cylinder 15.

[0018] The upper surface of the floating base plate 9 is provided with a groove 90 corresponding to the position of the cutting blade 6, and gluing mechanisms are provided on both sides of the groove 90.

[0019] The gluing mechanism is a strip-shaped glue outlet 92 that extends along the film width direction. The floating base plate 9 has a glue storage tank 91 inside, which is connected to the strip-shaped glue outlet 92 and contains adhesive liquid. A pressing push plate 93 is provided at the bottom of the glue storage tank 91, and a pressing cylinder 94 is fixedly installed at the bottom of the floating base plate 9. The piston rod of the pressing cylinder 94 extends into the glue storage tank 91 and connects to the pressing push plate 93. Strip-shaped pressure strips 81 are provided on both sides of the lower surface of the upper pressure plate 8, corresponding to the positions of the strip-shaped glue outlet 92. The strip-shaped pressure strips 81 are connected to the upper pressure plate 8 by springs 82. When the upper pressure plate 8 and the floating base plate 9 are pressed together, the strip-shaped pressure strips 81 press against the outer edge of the strip-shaped glue outlet 92 to prevent adhesive overflow.

[0020] Each of the winding rollers 2 is equipped with an independent winding motor to drive its rotation.

[0021] The power and control cables of the winding motor are connected to the center and then to the electrical control system via a conductive slip ring.

[0022] Example 2 The gluing mechanism is a glue spraying head; the knife groove 90 has mounting grooves on both sides, and a plurality of glue spraying heads are evenly distributed in each mounting groove along the film width direction, with the glue spraying direction of the glue spraying head facing the film side.

[0023] Everything else is the same as in Example 1.

[0024] Under normal winding conditions, the winding turntable remains locked in position, and the winding roller at the winding station rotates forward at a uniform speed under the drive of an independent winding motor, continuously winding the film onto the winding drum. At this time, the entire cutting mechanism is in an avoidance state, and the floating bottom plate and the upper pressure plate are completely out of the orbital envelope of the winding roller. The outer auxiliary support is also in the initial position of opening outward. Neither the straightening pressure roller nor the fixed pressure roller contacts the roll and does not interfere with the normal winding operation.

[0025] When the roll at the winding station reaches the preset length or diameter, the system triggers a roll change command. The winding motor at this station decelerates to the set speed for roll change. After confirming that all moving mechanisms are in the safe clearance position, the winding turntable unlocks, and the drive motor drives the turntable to rotate by one station angle, rotating the finished roll that has been wound to the unloading station. At the same time, the adjacent winding roller with the pre-installed empty winding drum is rotated to the winding station. After it is in place, the turntable is locked again. At this time, a straight piece of film is naturally stretched between the finished roll and the empty winding drum, which is exactly aligned with the working area of ​​the cutting mechanism.

[0026] After the turntable is locked in place, the lifting cylinder on the fixing ring is activated, pushing the floating base plate radially outward along the turntable to the working position, supporting the taut film from the back. Then, the cutting cylinder drives the upper pressure frame downward. The strip pressure bar at the bottom of the upper pressure plate is floatingly installed via a buffer spring. During the downward movement, the strip pressure bar contacts the film surface first, and under the pre-tension of the spring, it presses the film flat and firmly onto the floating base plate, completing the film surface positioning and fixing, preventing the film surface from slipping and tearing during cutting. The upper pressure plate continues to feed downward, the buffer spring is gradually compressed, and the cutting blade protrudes downward relative to the strip pressure bar. The blade contacts the film and continues to cut, finally falling into the knife groove on the surface of the floating base plate, neatly cutting the entire film, with the cut precisely corresponding to the center line of the knife groove. At this time, the film on both sides of the cut is still pressed and positioned by the strip pressure bar, without displacement or curling.

[0027] Once the cut is complete, the extrusion cylinder immediately activates, pushing the extrusion pusher plate in the adhesive storage tank upwards at a uniform speed. Under pressure, the adhesive liquid in the tank is evenly extruded from the strip-shaped outlets on both sides of the cut groove, precisely coating the film tail and head surfaces on both sides of the cut, forming two continuous transverse adhesive layers. The strip pressure strip remains pressed against the outer edge of the strip-shaped outlets, preventing the adhesive from spreading outwards and ensuring neat adhesive line boundaries with no overflow.

[0028] After the adhesive is applied, the extrusion plate quickly falls back, stopping the extrusion of the adhesive and achieving adhesive cut-off. The cutting cylinder then drives the upper pressure frame to move upward and reset, and the cutting blade first exits the blade groove, followed by the strip pressure strip gradually separating from the film surface. At the same time, the floating bottom plate retracts towards the center of the turntable with the lifting cylinder, completely exiting the revolution envelope of the take-up roller and returning to the avoidance position.

[0029] After the cutting and gluing process is completed, the take-up rollers at the two stations operate according to preset logic: the take-up roller at the unloading station rotates forward at low speed, gradually winding and bonding the glued film tail to the outer surface of the finished roll to complete the edge sealing; the auxiliary support swings synchronously towards the turntable, and the finishing pressure roller at the end of the finished roll presses against the surface of the finished roll, straightening the end face and compacting the film layer as the roll rotates, ensuring that the end face of the finished roll is neat and free of loose film tails. The take-up roller at the take-up station first rotates in the reverse direction at low speed, winding and bonding the cut glued film tail to the surface of the empty take-up drum; the fixing pressure roller at the end of the changeover pressure frame simultaneously presses against the surface of the empty drum, assisting in the bonding and fixing of the film tail; after the film tail is firmly bonded, the take-up roller switches to forward rotation, gradually accelerating to the normal operating speed, and enters the constant tension take-up mode.

[0030] Once the winding station reaches a stable winding state and the unloading station completes the film tail winding, the auxiliary support returns to its initial position, and the equipment resumes normal continuous winding. The entire roll changing process does not require machine shutdown. Operators can remove the finished roll and replace it with a new empty winding drum at the unloading station while the equipment is running, waiting for the next roll changing cycle.

[0031] The above embodiments are illustrative of the present invention and are not intended to limit the present invention. Any simple modifications to the present invention are within the scope of protection of the present invention.

Claims

1. An automatic rewinding machine, characterized in that: The device includes a winding turntable (1), which is driven to rotate by a drive motor; the winding turntable (1) has several winding rollers (2) evenly arranged around its circumference; the winding turntable (1) is divided into a feeding station (11) and a winding station (12), and a cutting mechanism (3) is provided on the film conveying path between the feeding station (11) and the winding station (12); a mounting bracket (4) is provided on the outside of the winding turntable (1), and an auxiliary bracket (5) is rotatably mounted on the mounting bracket (4), and a finished product pressure frame (51) and a roll changing pressure frame (52) are mounted on the auxiliary bracket (5); a sorting pressure roller (53) is rotatably mounted at the end of the finished product pressure frame (51), and a fixed pressure roller (54) is rotatably mounted at the end of the roll changing pressure frame (52).

2. The automatic rewinding machine as described in claim 1, characterized in that: The cutting mechanism (3) includes an upper pressure frame (7), an upper pressure plate (8) at the bottom of the upper pressure frame (7), a cutting blade (6) at the bottom of the upper pressure plate (8), a cutting cylinder connected to the upper pressure frame (7), a floating bottom plate (9) below the upper pressure plate (8), the floating bottom plate (9) and the cutting blade (6) located on both sides of the film, a main shaft (13) at the center of the winding turntable (1), the winding turntable (1) being rotatably mounted on the main shaft (13); a fixing ring (14) is fixedly fitted on the main shaft (13), the fixing ring (14) not rotating synchronously with the winding turntable (1), and the fixing ring (14) and the floating bottom plate (9) being connected by a lifting cylinder (15).

3. The automatic rewinding machine as described in claim 1, characterized in that: The upper surface of the floating base plate (9) is provided with a knife groove (90) corresponding to the position of the cutting knife (6), and glue application mechanisms are provided on both sides of the knife groove (90).

4. The automatic rewinding machine as described in claim 3, characterized in that: The gluing mechanism is a glue spraying head; the knife groove (90) has mounting grooves on both sides, and several glue spraying heads are evenly distributed in each mounting groove along the film width direction, with the glue spraying direction of the glue spraying head facing the film side.

5. The automatic rewinding machine as described in claim 3, characterized in that: The gluing mechanism is a strip-shaped glue outlet (92) that extends along the film width direction; the floating base plate (9) has a glue storage tank (91) inside, which is connected to the strip-shaped glue outlet (92), and the glue storage tank (91) contains adhesive liquid; the bottom of the glue storage tank (91) is provided with a pressing push plate (93), and the bottom of the floating base plate (9) is fixed with a pressing cylinder (94). The piston rod of the cylinder (94) extends into the glue storage tank (91) and is connected to the extrusion push plate (93); the lower surface of the upper pressure plate (8) is provided with strip pressure strips (81) on both sides corresponding to the strip glue outlet (92). The strip pressure strips (81) are connected to the upper pressure plate (8) by springs (82). When the upper pressure plate (8) and the floating bottom plate (9) are pressed together, the strip pressure strips (81) press against the outer edge area of ​​the strip glue outlet (92) to prevent glue from overflowing.

6. The automatic rewinding machine according to claim 5, characterized in that: In its natural state, the lower end face of the strip pressure strip (81) protrudes beyond the blade end face of the cutting knife (6). During the downward movement of the upper pressure plate (8), the strip pressure strip (81) first presses against the film surface and presses the film tightly to the floating base plate (9). The cutting knife (6) continues to move downward with the upper pressure plate (8) and cuts into the film, cooperating with the knife groove (90) to complete the cutting of the entire film. After the cutting is in place, the extrusion cylinder (94) drives the extrusion push plate (93) to rise, and the adhesive liquid in the glue storage tank (91) is squeezed out through the strip glue outlet (92) and coated on the film surface on both sides of the cutting opening.

7. The automatic rewinding machine according to claim 6, characterized in that: During cutting, the strip pressure strip (81) is positioned to enclose the outer edge of the strip glue outlet (92). When applying glue, the strip pressure strip (81) adheres tightly to the film surface to restrict the glue from spreading outward, so that the glue forms a continuous glue line only in the area between the cut and the strip pressure strip (81).

8. The automatic rewinding machine as described in claim 1, characterized in that: Each of the winding rolls (2) is equipped with an independent winding motor to drive its rotation.

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