Method for roll change of a film web

Abstract

The present application relates to the technical field of plastic film production, and specifically discloses a roll changing method for a film roll, which comprises transferring a standby winding roller to a tension plate by means of rotating clamps, and further comprises the following steps: S1, placing the standby winding roller from a storage assembly to a standby position by means of the storage assembly; the storage assembly comprises a driving assembly and two storage portions; each storage portion comprises a self-rotating supporting inner disc and a fixed outer guard; the outer guard surrounds the supporting inner disc; the supporting inner disc is provided with a receiving groove in the circumferential direction; the outer guard is provided with an inlet and an outlet; the inlet and the outlet are both capable of being opposite to the receiving groove; during use, the driving assembly drives the supporting inner disc to rotate, so that the standby winding roller on the receiving groove is transferred to the outlet and then falls to the standby position. The present application solves the problem of low work efficiency caused by the need for manual replacement of the standby winding roller in the prior art.

Description

Technical Field

[0001] This invention relates to the field of plastic film production technology, and more specifically to a method for changing the rolls of a film roll. Background Technology

[0002] There are various ways to produce plastic film, such as extrusion blow molding, calendering, and casting. Each method has its own characteristics and different adaptability. Regardless of the method used to produce film, the edge material needs to be cut after the film is formed, and then the film needs to be wound up. When winding the film, the roll of film is put on an air expansion shaft to form a winding shaft (also called a film roll). After winding is completed, the air pressure in the air expansion shaft is released, so that the outer diameter of the air expansion shaft becomes smaller and it is taken out from the roll, making it easy to put on a new roll for film winding again.

[0003] With technological advancements, factories are becoming increasingly automated. In film winding, it's now possible to automatically cut the film with a cutting blade after the previous winding roller has finished winding, and utilize the existing roller-changing structure on the winding equipment to switch to a spare winding roller. Specifically, the roller-changing structure is installed on the active winding roller of the equipment and includes a rotating plate, a partially guide disk, and jaws. The rotating plate is coaxially rotatably connected to the active winding roller, the partially guide disk is fixedly installed, and the jaws include fixed jaws and movable jaws. The fixed jaws are fixedly installed to the rotating plate, and the movable jaws rotate... The movable jaw is connected to the rotating plate. The movable jaw has a bearing. After the bearing contacts the outer peripheral guide surface of the incomplete guide plate, the movable jaw and the fixed jaw form a complete jaw with a groove. The complete jaw then transfers the spare take-up roller on the input side of the active take-up roller into the groove of the jaw. As the rotating plate rotates, the spare take-up roller, which was originally located on the input side of the take-up roller, moves around the surface of the active take-up roller and is transferred to the output side of the active take-up roller. The film is wound onto the spare take-up roller by electrostatic force or by the double-sided tape that is pre-attached to the spare take-up roller.

[0004] While the automatic roll changing system ensures that roll changing can be performed without machine downtime, the long and heavy take-up rolls (typically 2-4 meters long, and significantly heavier due to the alloy steel construction of their air shafts) present challenges in placing spare take-up rolls in the spare area. Normally, for heavy and long take-up rolls, two workers would be needed to lift and place them. However, with increased factory automation, the number of personnel in each stage has decreased, and the placement of take-up rolls is often done by a single worker. When a worker places the take-up roll from one side, they need to lift the heavy and long roll. As a result, when the take-up roll is placed on the standby area, the cantilever end of the roll lacks support. Therefore, it often falls onto the standby area by dropping. On the one hand, it is very strenuous for a single worker to place the roll on one side of the cantilever, and there is a certain risk of it falling. On the other hand, the take-up roll and the standby area are damaged due to the impact when falling. In addition, it is difficult to ensure that the take-up roll is centered when falling, which leads to the roll not being centered.

[0005] Furthermore, the existing equipment can only place one spare take-up roll in a specific location in the spare area. The spare take-up roll is typically placed only after it has been used up. The frequency of roll replacement varies depending on the winding diameter; high-frequency replacements require replacement approximately every half hour, while low-frequency replacements may require replacement every 2-3 hours. For situations with higher replacement frequencies, workers need to change the take-up rolls even more frequently. However, the workers responsible for changing the take-up rolls often do not primarily perform this task, forcing them to frequently leave their main work positions to perform spare take-up roll replacements. This significantly reduces the efficiency of their primary work. If a worker forgets to change the spare take-up roll, the winding equipment will be unable to complete the winding process. Summary of the Invention

[0006] The present invention aims to provide a method for changing the rolls of a film roll, so as to solve the problem of low worker efficiency caused by the need for manual replacement of spare take-up rolls when the take-up rolls are frequently changed in the prior art.

[0007] To achieve the above objectives, the present invention adopts the following technical solution:

[0008] A method for changing the roll of a film roll includes transferring a spare take-up roll from a spare position to a slot on a tension plate using rotating jaws, and further includes the following steps:

[0009] S1. Before the spare take-up roller is caught by the chuck, the spare take-up roller is moved from the storage assembly to the spare position using the storage assembly: The storage assembly is located above the spare position and includes a drive unit and two storage sections symmetrically arranged about the film conveying direction. Each storage section includes a self-rotating inner support plate and a fixedly installed outer protective component. The outer protective component protects the outer perimeter of the inner support plate. The inner support plate has multiple receiving grooves with openings facing the outer protective component around its circumference. The receiving grooves are parallel to the active take-up roller. The outer protective component has a feed port and a discharge port. The feed port is located above the discharge port, and both the feed port and the discharge port can be directly opposite the opening of the receiving groove. In use, the drive unit drives the inner support plate to rotate, so that the spare take-up roller on the receiving groove is transferred to the discharge port. The spare take-up roller falls from the discharge port to the spare position.

[0010] The principle and advantages of this scheme are:

[0011] When using the roller changing method of this scheme, the storage components are designed so that each receiving slot can hold one spare take-up roller. Workers can place multiple spare take-up rollers on the inner support plate at once. When a spare take-up roller needs to be placed in its spare position in step S1, simply starting the drive unit rotates the inner support plate, releasing the spare take-up roller near the discharge port. Because the receiving slots are parallel to the active take-up roller, the released spare take-up roller can be transferred to the tension plate by the chucks. This achieves both single-roller changing and allows workers to place multiple spare take-up rollers on the inner support plate through the feed port. The drive unit then automatically controls the release of spare take-up rollers based on production conditions. Throughout the process, workers do not need to place spare take-up rollers every time they are used, reducing the frequency of placement and allowing workers to focus their time on key tasks, thus improving work efficiency.

[0012] Furthermore, the presence of the drive unit allows the spare take-up roller to be actively released by controlling the rotation of the inner support disc, thereby improving the automation level of the factory and reducing the probability of the winding equipment failing to wind due to workers forgetting to place the spare take-up roller, which in turn reduces downtime caused by human factors.

[0013] In addition, in the existing technology, due to the special structure and high price of the air shaft on the take-up roller, it is generally required to be laid flat when not in use. Therefore, factories usually have a separate place to store the air shaft. This solution, through the setting of the support inner plate with multiple receiving slots, provides a storage rack for the spare take-up roller near the spare position, which facilitates the storage of the spare take-up roller.

[0014] Preferably, as an improvement, the storage assembly further includes a support rod fixedly installed between the two storage sections, the support rod being close to the feed inlet; it also includes step S0 prior to step S1, step S0 specifically as follows:

[0015] S0: When placing the spare take-up roller, lift the spare take-up roller, place one end of the spare take-up roller on the support rod, and then push the spare take-up roller along the support rod to the storage section on the opposite side until the spare take-up roller is close to the feed inlet. Then, put the spare take-up roller into the receiving groove from the feed inlet.

[0016] Beneficial effects: Because the support rod spans between the two storage sections, when placing a long and heavy spare take-up roller, a single worker only needs to place the spare take-up roller on the support rod and then push it to the opposite storage section. When the other end of the spare take-up roller is observed to be close to the feed inlet, the worker then uses both hands to lift the spare take-up roller and place it from the feed inlet into the corresponding receiving slot. The entire placement process is greatly reduced by the support rod sharing the weight of the spare take-up roller, thanks to the support rod. Furthermore, the manual lifting operation is only performed when the spare take-up roller is close to the receiving slot, so the time required to lift the spare take-up roller as a whole is short, making it less likely for it to fall due to lack of strength, thus reducing the probability of damage to the spare take-up roller due to impact.

[0017] In addition, the presence of the support rods allows the two separate storage sections on the left and right to be integrated into one unit, improving the structural stability between the two storage sections.

[0018] Preferably, as an improvement, the storage section further includes a fixedly installed guide plate. The guide plates on the two storage sections are located on the outside of the two supporting inner discs. The guide plates are provided with inclined guide surfaces, and the two guide surfaces form a V-shape. In step S1, when the supporting inner discs rotate, the off-center spare take-up roller automatically achieves centering under the guidance of the guide surfaces of the guide plates on both sides.

[0019] Beneficial effects: Because the guide plate with the inclined guide surface is set on the outside of the two inner support plates, the worker only needs to place the spare take-up roller on the receiving groove. The non-centered spare take-up roller will automatically center its position by contacting the guide surface as the inner support plates rotate. There is no need for manual adjustment of the centering, and the problem of non-centered take-up due to the spare take-up roller not being centered is also avoided.

[0020] Preferably, as an improvement, the bottom of the receiving groove is provided with ball bearings, and the portion of the receiving groove where no ball bearings are installed is provided with an elastic block.

[0021] Beneficial effects: By setting the ball bearings, the friction force experienced by the spare take-up roller when it automatically centers is small, making automatic centering easier; in actual use, the free height of the elastic block can be set higher than the top surface of the ball bearings, so that when the spare take-up roller is placed, there will be no problem of the spare take-up roller directly colliding with the bottom of the receiving groove and being damaged.

[0022] Preferably, as an improvement, the feed inlet is provided with an extended channel.

[0023] Beneficial effect: By extending the channel, multiple spare take-up rollers can be stacked on the feed inlet, thereby increasing the number of spare take-up rollers that can be stored on the storage assembly.

[0024] Preferably, as an improvement, a rotatable buffer rod is provided below the storage section, and an elastic element is provided between the buffer rod and the frame. The free end of the buffer rod is tilted upward in the free state and located below the discharge port. In step S1, during the process of the spare take-up roller falling from the discharge port, the buffer rod, under the action of the elastic element, supports the falling spare take-up roller and causes it to fall slowly.

[0025] Beneficial effects: By setting up buffer bars and elastic components, this solution guides the spare take-up roller to fall more slowly from the discharge port to the spare position that can be reached by the chucks. This prevents the spare take-up roller from falling suddenly and landing on the spare position under the influence of gravity, thus avoiding collision damage and improving the service life of the spare take-up roller.

[0026] Preferably, as an improvement, a spray bottle is provided below the storage section, and the pressing part of the spray bottle is located below the buffer rod. The pressing part of the spray bottle can be pressed by the buffer rod, and the nozzle of the spray bottle faces the bearing on the spare take-up roller. When the spare take-up roller falls in step S1, the buffer rod rotates and presses the spray bottle, thereby lubricating the bearing on the spare take-up roller.

[0027] Beneficial effects: This solution involves installing a spray bottle with a nozzle below the buffer rod. When the buffer rod swings under the weight of the spare take-up roller, it presses against the pressing part of the spray bottle, thereby forcing the spray bottle to spray out lubricating oil. The sprayed lubricating oil can be sprayed onto the bearing of the spare take-up roller, thus achieving lubrication of the bearing on the spare take-up roller without the need for staff to lubricate the bearing of the spare take-up roller regularly.

[0028] Preferably, as an improvement, a baffle is provided on the side of the discharge port, the baffle and the claw are located on both sides of the discharge port, and the rotation center of the buffer rod is located on the side where the baffle is located.

[0029] Beneficial effects: By setting the position of the rotation center of the baffle and the buffer rod, this solution ensures that when the buffer rod guides the falling spare take-up roller, the spare take-up roller always falls against the baffle, ensuring that the spare take-up roller will not move towards the chuck on its own after falling, and ensuring that the spare take-up roller falls accurately to the spare position every time.

[0030] Preferably, as an improvement, the drive unit includes a transmission gear set and a driver. The transmission gear set includes a driving gear, a driven gear, a driving shaft, and a driven shaft. The driving gear is an incomplete gear. The driving gear and the pawl are simultaneously fixedly mounted on the driving shaft. The driven gear is mounted on the driven shaft. The driving gear and the driven gear can mesh. The driven shaft is connected to the inner support disc for transmission. The driver drives the driving shaft to rotate.

[0031] Beneficial effects: When this solution is adopted, the drive unit's drive is used to both rotate the chuck and rotate the inner support disc through the meshing of the active and passive gears. Therefore, it realizes the function of using the same power to drive two components, which helps to reduce costs and improve energy efficiency.

[0032] Furthermore, in this solution, the incomplete meshing of the driving and driven gears ensures that the driven gear does not rotate once when the driving gear rotates once. The driving gear's meshing design allows it to rotate only when the chuck begins to rotate, thus ensuring the spare take-up roller reaches its spare position before the chuck. Each rotation angle of the inner support disc equals the angle between adjacent receiving slots, ensuring that after the drive unit starts, the inner support disc rotates and releases the spare take-up roller from the receiving slot closest to the discharge port to its spare position. The spare take-up roller in its spare position will reach its spare position before the chuck, ensuring that the spare take-up roller can be retrieved when needed. When the receiving slot containing the spare take-up roller is directly opposite the discharge port, the incomplete meshing of the driving gear with the driven gear stops the driven gear from rotating. This ensures that each rotation of the driving gear drives the chuck to rotate once, while only rotating the inner support disc by the angle between adjacent receiving slots.

[0033] Preferably, as an improvement, the driven gear and the driven shaft are engaged by an axial groove and an axial protrusion, allowing the driven gear to move axially along the axial protrusion.

[0034] Beneficial effects: When using this solution, if the number of spare take-up rollers on the inner support plate is small and manual storage of spare take-up rollers is required, in order to ensure that the driven gear and the driving gear do not come into contact at all, the worker can push the driven gear to move axially along the driven shaft when the drive is not running, so that the driven gear moves away from the driving gear. The worker can then rotate the inner support plate to make it easy to fill the inner support plate with spare take-up rollers. Attached Figure Description

[0035] Figure 1 This is a three-dimensional structural diagram of the roll changing system of the present invention on the winding equipment (the diagram shows the spare winding roll and the winding roll being wound).

[0036] Figure 2 This is a three-dimensional structural diagram of the roller changing system according to an embodiment of the present invention after removing the take-up roller that is currently being wound and dashing the active take-up roller (no spare take-up roller is placed on the storage component in this figure).

[0037] Figure 3 for Figure 2 Right view (active take-up roller not shown).

[0038] Figure 4 for Figure 3 Enlarged schematic diagram of part A in the diagram.

[0039] Figure 5 for Figure 2 A three-dimensional structural diagram from another perspective after the active take-up roller is removed (to show the connection relationship between the driver, the rotating plate, and the chuck).

[0040] Figure 6 for Figure 5 Top view.

[0041] Figure 7 for Figure 6 A partial sectional view under BB.

[0042] Figure 8 for Figure 5 A schematic diagram of the three-dimensional structure from another perspective.

[0043] Figure 9 This is a schematic diagram of the storage section for storing components in this embodiment (the guide plate on the right storage section is not shown in the figure). Detailed Implementation

[0044] The following detailed description illustrates the specific implementation method:

[0045] The reference numerals in the accompanying drawings include: frame 100, unloading plate 101, unloading cylinder 102, winding assembly 10, active winding roller 11, tension plate 12, tension cylinder 13, film roll changing mechanism 200, storage assembly 20, drive unit 21, driver 211, drive shaft 212, driven shaft 213, drive gear 214, driven gear 215, storage section 22, inner support plate 221, receiving groove 2211, and ball bearing 22. 12. Outer protective component 222, discharge port 2221, extension channel 2222, guide plate 223, guide surface 2231, baffle 224, transmission rod 225, support rod 226, buffer rod 23, spray bottle 24, nozzle 241, mounting base 25, strip through hole 251, roller changing assembly 30, rotating plate 31, guide plate 32, chuck 33, fixed chuck 331, movable chuck 332, rolling bearing 333, spare take-up roller 300.

[0046] The basic implementation examples are as follows: Figures 1 to 9 As shown.

[0047] Combination Figure 1 A method for changing the roll of a film roll requires a film roll changing system. The film roll changing system includes a frame 100, a winding assembly 10, and a film roll changing mechanism 200. The film roll changing mechanism 200 includes a storage assembly 20 and a changing assembly 30. The winding assembly 10 is used to provide winding power to the winding roll that is being wound. The storage assembly 20 is used to store a spare winding roll 300. The changing assembly 30 is used to transfer the spare winding roll placed in the spare position to the winding assembly 10.

[0048] Specifically, the winding assembly 10 includes an active winding roller 11, a tension plate 12, and a tension cylinder 13. The active winding roller 11 can be an active winding skin roller. Both the active winding roller 11 and the tension plate 12 are rotatably connected to the frame 100. The active winding roller 11 rotates continuously during the film winding process to provide power for film winding. The active winding roller 11 is driven by a separate power mechanism (not shown in the figure in this embodiment). The free end of the tension plate 12 is provided with a U-shaped slot. The tension cylinder 13 is mounted on the frame 100. The tension cylinder 13 is used to drive the tension plate 12 to rotate and keep the winding roller of the film being wound in the U-shaped slot close to the active winding roller 11, thereby ensuring that the rotation of the active winding roller 11 can drive the winding roller to wind the film.

[0049] A discharge plate 101 is rotatably connected to the frame 100. The top of the discharge plate 101 is a free end and is provided with a blocking groove. A discharge cylinder 102 (either a hydraulic cylinder or a pneumatic cylinder) is installed on the frame 100. The discharge cylinder 102 is used to control the discharge plate 101 to rotate after the roll with the film wound up is placed on the blocking groove of the discharge plate 101. This facilitates the discharge plate 101 to move the roll away from the active take-up roll 11 and facilitates the transfer equipment (such as a forklift) to transfer the roll with the film away.

[0050] The storage assembly 20 of the film roll changing mechanism 200 is located on the input side of the active take-up roller 11 and above the standby position. The storage assembly 20 includes a drive unit 21 and two storage sections 22 symmetrically arranged about the film conveying direction. Each storage section 22 includes a self-rotating inner support disk 221, a fixedly installed outer protective member 222, and a fixedly installed guide plate 223. The outer protective member 222 surrounds the inner support disk 221, and the inner support disk 221 has multiple openings circumferentially facing the outer protective member 222. The receiving groove 2211 is parallel to the active winding roller 11. The outer protective part 222 has a feed port and a discharge port 2221. The feed port is located directly above the discharge port 2221. Both the feed port and the discharge port 2221 can be directly opposite the opening of the receiving groove 2211. The guide plates 223 on the two storage parts 22 are located outside the two supporting inner plates 221. Each guide plate 223 has an integrally formed inclined guide surface 2231. The two guide surfaces 2231 form a V-shape with a larger upper surface and a smaller lower surface.

[0051] The outer protective component 222 is fixedly installed on the frame 100 by a baffle 224. The outer protective plate includes a left protective plate and a right protective plate. The surfaces of the left and right protective plates facing the inner support plate 221 are both arc surfaces. The left and right protective plates and the guide plate 223 are fixedly connected to each other by screws to form a whole. A transmission rod 225 is fixedly connected between the two inner support plates 221. The transmission rod 225 is rotatably connected to the guide plates 223 of the two storage sections 22. The baffle 224 is fixedly installed on the protective plate away from the tension plate 12 (referred to as the right protective plate in this embodiment).

[0052] Each outer protective component 222 has a vertical extension channel 2222 fixed on its feed inlet. The extension channel 2222 allows multiple spare take-up rollers to be stacked on the feed inlet, thereby increasing the number of spare take-up rollers that can be stored on the storage assembly 20.

[0053] A support rod 226 is fixed above the extension channel 2222. The support rod 226 is fixedly connected to one of the walls of the extension channel 2222 of the two storage sections 22. The support rod 226 is parallel to the active take-up roller 11.

[0054] The bottom of the receiving groove 2211 supporting the inner plate 221 is equipped with universal ball bearings 2212. An elastic block is provided on the part of the bottom of the receiving groove 2211 where the ball bearings 2212 are not installed. In this embodiment, the elastic block is made of pearl cotton (not shown in the figure). The universal ball bearings 2212 reduce the friction experienced by the guide plate 223 when guiding and centering the spare take-up roller, improving the smoothness of the automatic centering process. The presence of pearl cotton cushions the spare take-up roller from the feed inlet when it falls onto the receiving groove 2211, preventing collision damage between the spare take-up roller and the receiving groove 2211.

[0055] In addition, in this embodiment, in order to reduce the maintenance cost of the inner support plate 221, the receiving groove 2211 is installed in the form of an insert. When the receiving groove 2211 is damaged or the receiving groove 2211 is not suitable for storing spare take-up rollers, the insert with the receiving groove 2211 can be replaced separately.

[0056] The storage assembly 20 also includes a buffer rod 23 installed below each inner support plate 221. The buffer rod 23 is rotatably connected to the frame 100. An elastic element is installed between the buffer rod 23 and the frame 100. In this embodiment, the elastic element is a spring. The free extension and retraction direction of the elastic element is vertical. The free end of the buffer rod 23 is tilted upward in the free state and located below the discharge port 2221.

[0057] The storage assembly 20 also includes a spray bottle 24 located below the storage section 22. The pressing element of the spray bottle 24 is located below the buffer rod 23, and the pressing element of the spray bottle 24 can be pressed by the buffer rod 23. The nozzle 241 of the spray bottle 24 faces the bearing on the spare take-up roller. The spray bottle 24 is mounted on the frame 100 via a mounting base 25. Specifically, the mounting base 25 has a through hole for placing the spray bottle 24 and a strip-shaped through hole 251. The mounting base 25 is fixedly connected to the frame 100 by bolts and nuts through the strip-shaped through hole 251. The length direction of the strip-shaped through hole 251 is parallel to the projection of the buffer rod 23 onto the horizontal plane. The installation position of the spray bottle 24 can be adjusted by moving the position of the mounting base 25, thereby adjusting the degree to which the spray bottle 24 is pressed, so as to facilitate the adjustment of the amount of lubricating oil sprayed.

[0058] The baffle 224 supporting the outer protective component 222 is located on the side of the discharge port 2221, and the baffle 224 and the roller changing assembly 30 are located on the left and right sides of the discharge port 2221. The rotation center of the buffer rod 23 is located on the side where the baffle 224 is located. When the spare take-up roller falls from the receiving groove 2211 along the discharge port 2221, the falling process is supported by the buffer rod 23. Since the buffer rod 23 is inclined upward, the spare take-up roller tends to move away from the active take-up roller 11 after being supported by the buffer rod 23. However, due to the presence of the baffle 224, the movement of the spare take-up roller along the length of the buffer rod 23 is hindered, thereby ensuring that the falling process of the spare take-up roller is basically vertical and falls to the spare position directly below the discharge port 2221. Moreover, the falling process is slower and there will be no situation where the spare take-up roller falls directly from the discharge port 2221 and hits the spare position on the frame 100.

[0059] The drive unit 21 is used to drive the inner support plate 221 to rotate.

[0060] The roller changing assembly 30 includes a rotating plate 31, an incomplete guide disk 32, and a chuck 33. The roller changing assembly 30 adopts existing technology. Specifically, the rotating plate 31 coincides with the central axis of the active winding roller 11, the guide disk 32 has an incomplete guide surface, the guide surface is an arc surface coaxial with the rotating plate 31, and the rotating plate 31 is fixedly connected to the active shaft 212. The incomplete guide plate 32 is fixedly installed. The jaw 33 includes a fixed jaw 331 and a movable jaw 332. The fixed jaw 331 is fixedly connected to the rotating plate 31, and the movable jaw 332 is rotatably connected to the fixed jaw 331. The movable jaw 332 is equipped with a rolling bearing 333. After the rolling bearing 333 contacts the outer peripheral guide surface of the incomplete guide plate 32, the movable jaw 332 and the fixed jaw 331 form a complete jaw 33 with a slot. The complete jaw 33 then transfers the spare take-up roller in the spare position to the slot of the jaw 33. Then, as the rotating plate 31 rotates, the spare take-up roller originally located on the input side of the active take-up roller 11 moves around the surface of the active take-up roller 11 and is transferred to the output side of the active take-up roller 11.

[0061] The drive unit 21 includes a transmission gear set and a driver 211. The transmission gear set includes a drive shaft 212, a driven shaft 213, a drive gear 214, and a driven gear 215. The drive gear 214 is an incomplete gear. In this embodiment, the number of receiving slots 2211 is 4, and the number of teeth of the incomplete gear accounts for one-quarter of the number of teeth of the complete gear. The drive shaft 212 and the driven shaft 213 are rotatably connected to the frame 100 and are parallel to the drive take-up roller 11. The drive gear 214 and the rotating plate 31 are simultaneously fixedly installed on the drive shaft 212. The driven gear 215 is installed on the driven shaft 213. The drive gear 214 and the driven gear 215 can mesh. The driven shaft 213 is connected to the transmission rod 225 on the inner support disc 221 via a belt drive. The driver 211 is used to drive the drive shaft 212 to rotate. The driver 211 can be a motor.

[0062] Furthermore, the passive gear 215 and the passive shaft 213 are engaged by an axial groove and an axial protrusion. If the passive shaft 213 is constructed with a spline shaft, the passive gear 215 can move axially along the axial protrusion. This allows the passive gear 215 to be manually pushed when the driver 211 is no longer needed to rotate the inner support disk 221. This causes the passive gear 215 to be axially offset from the driving gear 214, ensuring that the rotation of the inner support disk 221 is not affected by the driving gear 214 on the driving shaft 212. This makes it easier to manually control the inner support disk 221 to rotate independently when the storage components 20 are filled at once.

[0063] A method for changing the rolls of a film roll includes the following steps:

[0064] S0. Place the spare take-up roller on the storage assembly 20: Manually lift the spare take-up roller, place one end of the spare take-up roller on the support rod 226, and then push the spare take-up roller along the support rod 226 towards the opposite storage section 22 until the spare take-up roller is close to the feed inlet. Place the spare take-up roller from the feed inlet into the receiving groove 2211. Rotate the inner support plate 221 so that the receiving groove 2211 containing the spare take-up roller is rotated until it is blocked by the outer protective member 222. At the same time, the new receiving groove 2211 without a spare take-up roller is aligned with the feed inlet, which facilitates the storage of the next spare take-up roller. Operate the inner support plate 221 using the same steps as above until multiple spare take-up rollers are placed on the inner support plate 221.

[0065] S1. Storage component 20 releases the spare take-up roller to the spare position: After starting via driver 211, power is transmitted through drive shaft 212, drive gear 214, driven gear 215, driven shaft 213, and finally through belt to transmission rod 225, causing the inner support disc 221 to rotate at a certain angle. This allows the spare take-up roller on the receiving groove 2211 adjacent to the discharge port 2221 to be transferred to the position directly opposite the discharge port 2221. Under the action of gravity, the spare take-up roller falls from the discharge port 2221 to the spare position. During the falling process, buffer rod 23 supports the spare take-up roller to ensure that the spare take-up roller is properly positioned. The roller falls slowly and vertically along the baffle 224 to avoid collision and damage to the spare take-up roller during its descent. Simultaneously, during the descent, the buffer rod 23 is pressed down, causing the spray bottle 24 to be pressed down. The lubricating oil contained in the spray bottle 24 is sprayed from the nozzle 241 onto the bearings of the spare take-up roller (the spare take-up roller has bearings at both ends of the air shaft), thus lubricating the bearings on the spare take-up roller. In addition, during the rotation of the inner support plate 221, the guide surfaces 2231 on the left and right guide plates 223 on both sides of the film guide the non-centered spare take-up roller, so that the spare take-up roller moves axially to achieve automatic centering adjustment.

[0066] S2. The spare take-up roller is transferred from the spare position to the tension plate 12 via the roller changing assembly 30: After the drive 211 is started, the rotating plate 31 also rotates with the drive shaft 212. The pawl 33 on the rotating plate 31 rotates upward from below the rotating plate 31. During the upward rotation, the rolling bearing 333 on the movable pawl 332 gradually abuts against the incomplete guide disc 32, so that the pawl 33 forms a fixed opening. The opening of the pawl 33 rotates to the spare position and locks the spare take-up roller. The pawl 33 locking the spare take-up roller continues to rotate with the rotating plate 31, transferring the spare take-up roller from the input side of the drive take-up roller 11 to the U-shaped slot of the tension plate 12 on the output side (that is, using the rotating pawl 33 to transfer the spare take-up roller from the spare position around the drive take-up roller 11 to the slot of the tension plate 12), completing the roller changing action of the spare take-up roller.

[0067] Compared with the prior art, this embodiment improves the film roll changing mechanism 200 so that the whole system can not only store spare take-up rolls, but also automatically lower the stored spare take-up rolls to the spare position when needed, and can also automatically adjust the centering of the spare take-up rolls; in addition, the storage component 20 shares a driver 211 with the roll changing component 30 that drives the chuck 33 to rotate, which is beneficial for energy saving and more adaptable to the design layout of existing limited space.

[0068] In addition, the optimized design of the film roll changing mechanism 200 ensures that the spare take-up roll will not be subjected to large-scale impacts, and the bearings of the spare take-up roll are lubricated during the process of lowering the spare take-up roll to the spare position, thereby extending the service life of the spare take-up roll.

[0069] The above descriptions are merely embodiments of the present invention, and common knowledge such as specific technical solutions and / or characteristics are not described in detail here. It should be noted that those skilled in the art can make various modifications and improvements without departing from the technical solutions of the present invention, and these should also be considered within the scope of protection of the present invention. These modifications and improvements will not affect the effectiveness of the implementation of the present invention or the practicality of the patent. The scope of protection claimed in this application should be determined by the content of its claims, and the specific embodiments described in the specification can be used to interpret the content of the claims.

Claims

1. A method for changing the roll of a film roll, comprising using rotating jaws to transfer a spare take-up roll from a spare position to a slot on a tension plate, characterized in that, It also includes the following steps: S1. Before the spare take-up roller is caught by the chuck, the spare take-up roller is moved from the storage assembly to the spare position using the storage assembly: The storage assembly is located above the spare position. The storage assembly includes a drive unit and two storage sections symmetrically arranged about the film conveying direction. Each storage section includes a self-rotating inner support plate and a fixedly installed outer protective component. The outer protective component protects the outer periphery of the inner support plate. The inner support plate has multiple receiving grooves with openings facing the outer protective component around its circumference. The receiving grooves are parallel to the active take-up roller. The outer protective component has a feed port and a discharge port. The feed port is located above the discharge port. Both the feed port and the discharge port can be directly opposite the openings of the receiving grooves. In use, the drive unit drives the inner support plate to rotate, so that the spare take-up roller on the receiving groove is transferred to the discharge port. The spare take-up roller falls from the discharge port to the spare position. A rotatable buffer rod is installed below the storage section. An elastic element is provided between the buffer rod and the frame. The free end of the buffer rod is tilted upward in the free state and located below the discharge port. In step S1, during the process of the spare take-up roller falling from the discharge port, the buffer rod, under the action of the elastic element, supports the falling spare take-up roller and makes it fall slowly. A spray bottle is installed below the storage section. The pressing part of the spray bottle is located below the buffer rod. The pressing part of the spray bottle can be pressed by the buffer rod. The nozzle of the spray bottle faces the bearing on the spare take-up roller. When the spare take-up roller falls in step S1, the buffer rod rotates and presses the spray bottle, thus lubricating the bearing on the spare take-up roller.

2. The method for changing rollers on a film roll according to claim 1, characterized in that: The storage assembly also includes a support rod fixedly installed between the two storage sections, with the support rod near the feed inlet; it also includes step S0 prior to step S1, which is as follows: S0: When placing the spare take-up roller, lift the spare take-up roller, place one end of the spare take-up roller on the support rod, and then push the spare take-up roller along the support rod to the storage section on the opposite side until the spare take-up roller is close to the feed inlet. Then, put the spare take-up roller into the receiving groove from the feed inlet.

3. The method for changing rollers on a film roll according to claim 2, characterized in that: The storage section also includes a fixedly installed guide plate. The guide plates on the two storage sections are located on the outside of the two supporting inner disks. The guide plates are provided with inclined guide surfaces, and the two guide surfaces form a V shape. In step S1, when the supporting inner disk rotates, the non-centered spare take-up roller automatically achieves centering under the guidance of the guide surfaces of the guide plates on both sides.

4. The method for changing rollers on a film roll according to claim 3, characterized in that: The bottom of the receiving groove is provided with ball bearings, and the part of the receiving groove where no ball bearings are installed is provided with elastic blocks.

5. The method for changing rollers on a film roll according to claim 1, characterized in that: The feed inlet is equipped with an extended channel.

6. The method for changing rollers on a film roll according to claim 1, characterized in that: A baffle is provided on the side of the discharge port, and the baffle and the claw are located on both sides of the discharge port. The rotation center of the buffer rod is located on the side where the baffle is located.

7. A method for changing rolls of a film roll according to any one of claims 1-6, characterized in that: The drive unit includes a transmission gear set and a driver. The transmission gear set includes a driving gear, a driven gear, a driving shaft, and a driven shaft. The driving gear is an incomplete gear. The driving gear and the pawl are fixedly mounted on the driving shaft. The driven gear is mounted on the driven shaft. The driving gear and the driven gear can mesh. The driven shaft is connected to the inner support disc for transmission. The driver drives the driving shaft to rotate.

8. The method for changing rollers on a film roll according to claim 7, characterized in that: The passive gear and the passive shaft are engaged by an axial groove and an axial protrusion, allowing the passive gear to move axially along the axial protrusion.

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