Automatic material changing and winding device for packaging bag film roll

Abstract

The present application relates to a packaging bag film roll automatic material changing and winding device, which belongs to the technical field of film roll changing and winding machines, and comprises a U-shaped frame, a rotating roller rotatably connected to the inner side of the frame through a rotating shaft, and a main motor for driving the rotating shaft. The inner side of the frame is sequentially rotatably connected to a guide roller and two input rollers towards the right side of the rotating roller. The inner side of the frame is sequentially rotatably connected to a middle fork and a left fork towards the left side of the rotating roller. In the process of cutting the film roll with the cutter moving along the cutter seat, the whole film roll is adhered and limited by the rollable negative pressure adsorption roller, the instantaneous impact force generated by the transverse shearing of the cutter is offset, the film roll width direction deviation is limited, and the cut film roll end can be accurately wound on the outer wall of the winding sleeve, ensuring the smooth winding of the film roll.

Description

Technical Field

[0001] This invention relates to the field of roll-changing machine technology, specifically to an automatic material changing and roll-up device for packaging bag film rolls. Background Technology

[0002] After undergoing a series of processes including granule melt extrusion, film blowing and cooling, herringbone flattening, heat sealing, and easy-tear line pressing, plastic continuous packaging bags need to be collected and wound into finished film rolls. Currently, the industry generally uses mature fully automatic material changing and winding devices for packaging bag film roll processing. The conventional winding operation mode is to first pre-install and fix the hollow winding sleeve on the outer wall of the winding roller. After the formed continuous packaging bag film roll is formed, it is pulled and adhered to the outer circumference of the rotating roller by multiple sets of guide rollers. The rotating roller, which is attached to the winding sleeve on the outside of the winding roller, rotates and pulls the film material to complete the winding. After the outer film roll of the take-up sleeve is wound to the preset outer diameter specification, the machine starts the automatic roll changing program. The cutter head carries the cutter to the middle position between the full take-up sleeve and the new take-up sleeve to be used. The cutter cuts the packaging bag film material horizontally along the overall width of the film roll. The cut end of the film material is adhered and fixed by the adhesive on the surface of the new take-up sleeve, and then a new round of winding operation is started. The entire automatic roll changing and winding structure greatly reduces the downtime for changing materials due to the integrated structure of automatic cutting and adhesive rewinding. It is now widely used in film production lines.

[0003] However, existing equipment still has unavoidable drawbacks when performing transverse cutting and rewinding operations on thickened, high-toughness packaging bag film rolls. High-toughness packaging bags have excellent tensile and tear resistance. During the one-time cutting process along the width of the film, the blade generates an instantaneous transverse shearing impact force on the film. The film material lacks width-direction limiting constraints and is easily subject to shearing forces, resulting in width shifting and deviation. After the film roll deviates, it is locally stretched, squeezed, and piled up, forming irreversible wrinkles. After the film material is misaligned, it cannot be flatly adhered to the outer wall of the new roll sleeve to complete the bonding and positioning. At best, this results in uneven end faces of the new film roll and local loosening and waste rolls. At worst, it directly leads to bonding failure, interruption of the automatic roll changing process, and shutdown, which affects the continuous processing efficiency and finished product qualification rate of the entire bag making production line. Summary of the Invention

[0004] To overcome the shortcomings of existing technologies, this invention proposes an automatic material changing and winding device for packaging bag film rolls. This invention utilizes the rolling contact of the film roll with the surface of a rolling rod. The negative pressure adsorption generated by the rod's exposed holes on the outside of the rolling groove allows the cutter to adhere to and limit the entire film roll throughout the cutting process as the cutter moves with the cutter holder. This counteracts the instantaneous impact force generated by the cutter's lateral shearing, restricting the film roll's width-direction shift and ensuring that the cut film roll end is accurately wound onto the outer wall of the winding sleeve, guaranteeing smooth film roll winding.

[0005] The technical solution adopted by this invention to solve its technical problem is as follows: An automatic material changing and winding device for packaging bag film rolls, comprising a U-shaped frame and a rotating roller rotatably connected to the inner side of the frame via a rotating shaft; the rotating shaft is driven by a main motor; a guide roller and two input rollers are sequentially rotatably connected to the right side of the rotating roller from the inner side of the frame; a middle fork and a left fork are sequentially rotatably connected to the left side of the rotating roller from the inner side of the frame; the middle section of the middle fork is hinged to the inner wall of the frame via a central hydraulic cylinder; the middle section of the left fork is hinged to the outer wall of the frame via a left hydraulic cylinder; a turntable is rotatably connected to the outer walls at both ends of the rotating shaft; a knife holder and a right fork are fixedly connected to the outer wall of the turntable; the two knife holders... The inner side is fixedly connected by two air seats; the air seats are located outside the rotating roller and are not in contact with the rotating roller; a rolling groove is provided at the end of the air seat away from the rotating roller; a rolling rod is rolled and sealed inside the rolling groove; the end of the rolling rod is rotatably and sealed to the tool holder; a hollow groove is provided inside the rolling rod; the hollow groove is connected to the outer wall of the rolling rod through a rod hole; an upper groove is provided on the wall of the rolling groove and is connected to the rod hole; the upper groove is connected to a suction pump; a screw rod and a slide rod are rotatably connected to the inner side of the two tool holders; the slide rod is slidably connected to a tool holder with a cutting blade; the tool holder and the screw rod are threadedly connected; the screw rod is driven by a screw motor; the turntable is driven to rotate by a gear motor.

[0006] Preferably, an external gear ring is fixedly connected to the front side of the turntable at the front position; the external gear ring meshes with a gear; the gear is driven by a gear motor; an annular transfer groove is provided on the rear side of the turntable at the rear position; a transfer sleeve is rotatably connected in the transfer groove; a suction pump is fixedly connected to the outer wall of the transfer sleeve; the housing of the suction pump is fixedly connected to the inner side of the frame; the suction pump is connected to the transfer groove through a suction hole; the upper groove is connected to the transfer groove in sequence through the middle groove, the lower groove and the frame hole; the top of the frame overlaps the front and rear receiving rollers; the outer wall of the receiving roller is fitted with an adhesive receiving sleeve.

[0007] Preferably, the fork of the left fork faces right; the fork of the middle fork is away from the hinge point; the fork of the right fork is away from the turntable; the right fork is composed of a fork body, a first fork head, a second fork head, and an electric push rod; the fork body is fixedly connected to the turntable; the first fork head is fixedly connected to the end of the fork body away from the turntable and near the tool holder; the second fork head is hinged to the end of the fork body away from the turntable and away from the tool holder; the length of the first fork head is shorter than that of the second fork head; the electric push rod is hinged to the outer wall of the second fork head through the outer wall of the turntable; the front and rear sides of the frame are fixedly connected to the limiting plates by limiting blocks; the distance between the two limiting plates is adapted to the length of the take-up roller.

[0008] Preferably, the hollow groove is provided with partitions at intervals; the partitions divide the hollow groove into multiple hollow cavities along the axial direction of the rolling rod; the number of upper grooves and middle grooves is the same as the number of hollow cavities; the middle groove passes through the air seat near the inner wall of the tool holder; a middle strip is slidably and sealingly connected in the middle groove; the end of the middle strip is connected to the inner wall of the middle groove by a middle spring; a single upper groove is connected to multiple rod holes in the circumferential direction of the rolling rod; the upper groove is connected to the middle groove through an upper hole; a middle hole is provided through both sides of the middle strip; the middle hole is connected to or offset from the upper hole after the middle strip slides along the middle groove; trigger blocks are provided on both sides of the tool holder; the trigger blocks have inclined guide surfaces at both ends facing outwards; the trigger blocks can squeeze the end of the middle strip away from the middle spring through the guide surfaces; a pressure stabilizing hole is provided through the inner wall of the middle groove that abuts against the middle spring.

[0009] Preferably, the contact surface between the cutter and the film roll is a U-shaped blade; the axial length of the trigger block on the rolling bar is greater than the distance between two adjacent center bars; on the axial direction of the rolling bar, the trigger block triggers the center bars to drive the bar holes to adsorb the film roll before the cutter cuts the film roll.

[0010] Preferably, the blade holder has a sheet groove on the side facing the cutter; the cutter is composed of two independent and mutually contacting single blades; the single blades are rotatably connected to the sheet groove via a blade shaft; after the U-shaped blades of the two single blades enter the film roll, they will drive the two single blades to rotate around the blade shaft, thereby reducing the size of the U-shaped blades; the blade shaft and the sheet groove are rotatably connected by a torsion spring.

[0011] Preferably, the tool holder adopts a split structure, consisting of an upper half and a lower half that are inserted together; the upper half and the lower half of the tool holder are connected by a rectangular block and a rectangular slot; the rectangular slot extends outward and is threaded with a bolt.

[0012] Preferably, the gas seat has an arc-shaped groove at the end away from the turntable that is attached to the inner wall of the rolling groove; an arc-shaped strip is movably and sealed within the arc-shaped groove; the arc-shaped strip is connected to a support block fixed within the arc-shaped groove via an arc-shaped spring; and an ear strip is provided at the end of the arc-shaped strip away from the arc-shaped spring that is turned outward.

[0013] Preferably, the arc-shaped strip is composed of multiple arc-shaped blocks that are sealed and contacted with each other; each arc-shaped block is connected to an independent arc-shaped spring; the ear strip is composed of multiple ear blocks; each ear block is fixedly connected to an independent arc-shaped block.

[0014] The beneficial effects of this invention are as follows: 1. This invention utilizes the rolling contact of the film roll with the surface of a rolling rod, and the negative pressure adsorption generated by the rod hole exposed on the outside of the rolling groove of the rolling rod, so that during the cutting process of the film roll by the cutter moving with the cutter holder, the rolling negative pressure adsorption of the rolling rod adheres and limits the entire film roll throughout the process, offsetting the instantaneous impact force generated by the transverse shearing of the cutter, and limiting the transverse displacement of the film roll in the width direction. This ensures that the cut end of the film roll can be accurately wound onto the outer wall of the winding sleeve, ensuring the smooth winding of the film roll.

[0015] 2. This invention utilizes a segmented independent hollow cavity air path, a spring-reset on / off switch bar, and a follow-up trigger block, combined with a U-shaped blade structure, to achieve precise negative pressure adsorption at fixed points in the membrane roll cutting area and timely pressure release in the excess area. This concentrated adsorption force enhances the positioning stability of the membrane roll, while the pressure stabilizing structure ensures smooth component operation, effectively preventing cutting deviation and edge curling problems in high-toughness membrane rolls, and improving cutting accuracy and roll changing efficiency.

[0016] 3. This invention uses two flip-up single blades to form an adaptive opening and closing U-shaped blade structure, which works in conjunction with the blade shaft and torsion spring structure. This allows the blade to initially maintain a large opening for quick material feeding. During the cutting process, the blade automatically closes under the pressure of the film roll, reducing the blade opening. This achieves clamping and limiting of the high-toughness film roll during the cutting process, effectively suppressing problems such as film roll warping, offset, and slippage, and significantly improving the flatness of the film roll cut and the cutting stability. Attached Figure Description

[0017] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0018] Figure 1 This is a perspective view of the present invention; Figure 2 yes Figure 1 A stereoscopic view from another angle; Figure 3 This is a structural diagram of the inner side of the frame in this invention; Figure 4 yes Figure 3 Enlarged view of point A in the middle; Figure 5 This is a perspective view of the rotating roller and turntable in this invention; Figure 6 This is a perspective view of the tool holder and turntable in this invention; Figure 7 yes Figure 6 Enlarged view of point B in the middle; Figure 8 yes Figure 6 Enlarged view of point C in the middle; Figure 9 This is a cross-sectional view of the air seat and the rolling rod in this invention; Figure 10 This is a diagram showing the location of the mounting holes in this invention; Figure 11 This is a perspective view of the tool holder in this invention; Figure 12 This is a schematic diagram of the cutting motion in this invention.

[0019] In the diagram: Frame 1, Guide Roller 11, Input Roller 12, Middle Fork 13, Left Fork 14, Middle Hydraulic Cylinder 15, Left Hydraulic Cylinder 16, Take-up Roller 17, Take-up Sleeve 18, Limit Plate 19, Limit Block 191, Rotary Roller 2, Rotary Shaft 21, Main Motor 22, Turntable 3, Tool Holder 31, Right Fork 32, Fork Body 321, First Fork Head 322, Second Fork Head 323, Electric Push Rod 324, Adapter Groove 33, Adapter Sleeve 34, Suction Pump 35, Suction Hole 36, Gear Motor 37, External Gear Ring 38, Gear 39, Air Seat 4, Rolling Groove 41, Upper Groove 42, Middle 43. Slot 431, pressure stabilizing hole 431, lower slot 44, bracket hole 45, middle bar 46, middle hole 461, middle spring 47, upper hole 48, arc groove 49, rolling bar 5, hollow slot 51, hollow cavity 511, bar hole 52, partition 53, knife holder 6, screw rod 61, sliding bar 62, cutter 63, single blade 632, cutter shaft 633, limit point 634, screw motor 64, trigger block 65, guide surface 651, plate slot 66, rectangular block 67, rectangular slot 68, bolt 69, arc strip 7, arc spring 71, support block 72, arc block 74, ear bar 8, ear block 81. Detailed Implementation

[0020] To make the technical means, creative features, objectives and effects of this invention easier to understand, the invention will be further described below in conjunction with specific embodiments.

[0021] like Figures 1 to 12 As shown, the present invention includes the following embodiments: Example 1: An automatic material changing and winding device for packaging bag film rolls includes a U-shaped frame 1 and a rotating roller 2 rotatably connected to the inner side of the frame 1 via a rotating shaft 21; the rotating shaft 21 is driven by a main motor 22; a guide roller 11 and two input rollers 12 are sequentially rotatably connected to the right side of the rotating roller 2 on the inner side of the frame 1; a middle fork 13 and a left fork 14 are sequentially rotatably connected to the left side of the rotating roller 2 on the inner side of the frame 1; the middle section of the middle fork 13 is hinged to the inner wall of the frame 1 via a central hydraulic cylinder 15; the middle section of the left fork 14 is hinged to the outer wall of the frame 1 via a left hydraulic cylinder 16; an annular turntable 3 is rotatably connected to the outer walls at both ends of the rotating shaft 21; a knife holder 31 and a right fork 32 are fixedly connected to the outer wall of the turntable 3; the inner sides of the two knife holders 31 are fixedly connected by two air seats 4; the air seats... 4 is located outside the rotating roller 2 and is not in contact with the rotating roller 2; the end of the air seat 4 away from the rotating roller 2 is provided with a rolling groove 41; a rolling rod 5 is rolled and sealed inside the rolling groove 41; the end of the rolling rod 5 is rotatably and sealed to the tool holder 31; a hollow groove 51 is provided inside the rolling rod 5; the hollow groove 51 is connected to the outer wall of the rolling rod 5 through multiple rod holes 52; the groove wall of the rolling groove 41 is provided with an upper groove 42 that communicates with the rod holes 52; the upper groove 42 is connected to the suction pump 35; a screw rod 61 and a slide rod 62 are rotatably connected inside the two tool holders 31; the slide rod 62 is slidably connected to the tool holder 6 with a cutter 63; the tool holder 6 and the screw rod 61 are threadedly connected; the screw rod 61 is driven by a screw motor 64; the turntable 3 is driven to rotate by a gear motor 37.

[0022] In this embodiment, an external gear ring 38 is fixedly connected to the front side of the turntable 3 at the front position; the external gear ring 38 meshes with a gear 39; the gear 39 is driven by a gear motor 37; an annular transition groove 33 is provided on the rear side of the turntable 3 at the rear position; an transition sleeve 34 is rotatably and sealingly connected inside the transition groove 33; a suction pump 35 (simplified in the figure) is fixedly connected to the outer wall of the transition sleeve 34; the outer shell of the suction pump 35 is fixedly connected to the inner side of the frame 1; the suction pump 35 is connected to the transition groove 33 through a suction hole 36; the upper groove 42 is connected to the transition groove 33 in sequence through the middle groove 43, the lower groove 44 and the frame hole 45; the top of the frame 1 is fitted with a take-up roller 17 at the front and rear; the outer wall of the take-up roller 17 is fitted with an adhesive take-up sleeve 18.

[0023] In this embodiment, the fork of the left fork 14 faces right; the fork of the middle fork 13 is away from the hinge point; the fork of the right fork 32 is away from the turntable 3; the right fork 32 is composed of a fork body 321, a first fork head 322, a second fork head 323, and an electric push rod 324; the fork body 321 is fixedly connected to the turntable 3; the first fork head 322 is fixedly connected to the fork body 321 at a position away from the turntable 3 and close to the cutter holder 31; the second fork head 323 is hinged to the fork body 321 at a position away from the turntable 3 and away from the cutter holder 31; the length of the first fork head 322 is less than that of the second fork head 323; the electric push rod 324 is hinged to the outer wall of the second fork head 323 through the outer wall of the turntable 3; the front and rear sides of the frame 1 are fixedly connected to the limiting plates 19 by limiting blocks 191; the distance between the two limiting plates 19 is adapted to the length of the take-up roller 17.

[0024] After the packaging bag is processed through a complete set of pre-processing steps, including granule melt extrusion, film blowing and cooling, herringbone flattening, heat sealing, and easy-tear line pressing, the continuous film roll is traction and conveyed to this automatic material changing and winding device. In the initial state of the equipment, the middle fork 13, left fork 14, right fork 32, knife holder 31, and cutter 63 on the inner side of the frame 1 are all in standby positions. The winding roller 17 is pre-installed with an adhesive winding sleeve 18 and is mounted on the top of the frame 1. The limiting plates 19 fixed by the front and rear limiting blocks 191 form a limiting distance adapted to the length of the winding roller 17, which can limit the forward movement of the winding roller 17 throughout the entire process. The rearward movement ensures the stability of the winding roller 17 and winding sleeve 18 during installation and operation, preventing forward and backward displacement of the film roll during winding. During the formal winding operation, the formed continuous packaging bag film roll is introduced through the gap between the two input rollers 12, and after being precisely guided by the guide roller 11, it adheres to the outer wall of the rotating roller 2. The main motor 22 drives the rotating shaft 21 to drive the rotating roller 2 to rotate continuously. The middle fork bar 13 is hinged to the inner wall of the frame 1 through the middle hydraulic cylinder 15. In the initial state, the middle hydraulic cylinder 15 is in the extended state, pushing the middle fork bar 13 to engage and support the winding roller 17, so that the outer wall of the winding roller 17... The take-up sleeve 18 is tightly fitted to the surface of the rotating roller 2. Relying on the friction between the rotating roller 2 and the take-up sleeve 18, the take-up sleeve 18 and the take-up roller 17 rotate synchronously, thereby continuously winding and taking up the guided and fitted film roll to achieve continuous forming of the finished film roll. As the winding operation continues, the thickness and outer diameter of the film roll wound outside the take-up sleeve 18 gradually increase. To adapt to the changes in the film roll forming size, the central hydraulic cylinder 15 gradually extends with the increase in winding thickness, pushing the central fork 13 to drive the take-up roller 17 slowly away from the rotating roller 2, always maintaining the film roll in a flat winding state to ensure the winding is smooth. Uniform roll tension avoids problems such as loose or uneven roll winding. When the outer roll of the take-up sleeve 18 is wound to the preset outer diameter specification, the equipment triggers the automatic roll changing program. First, the gear motor 37 starts running, driving the gear 39 to mesh with the outer gear ring 38 of the front turntable 3 to rotate. This drives the two sets of turntables 3 to rotate counterclockwise around the outer wall of the rotating shaft 21. During the rotation of the turntable 3, the knife holder 31, air seat 4, rolling bar 5 assembly and right fork 32 fixed on the outer wall are simultaneously rotated upward and moved from the standby position below the initial turntable 3 to the outer roll working area of ​​the rotating roller 2.During the lifting process of the cutter holder 31 and the air seat 4, the rolling bars 5 on the outer sides of the two sets of air seats 4 simultaneously contact the inner side of the film roll on the outer wall of the rotating roller 2, supporting the entire film roll to be cut upwards and arching it appropriately, so that the film roll is separated from the surface of the rotating roller 2, forming an independent cutting operation area. At the same time, the turntable 3 drives the right fork 32 to flip upwards simultaneously. The right fork 32 is composed of a fork body 321, a first fork head 322, a second fork head 323, and an electric push rod 324. In the initial state, the electric push rod 324 extends, driving the second fork head 323 to retract, so that the right fork 32 forms a fork. The longer second fork head 323 accurately picks up the brand new empty take-up roller 17 on the frame 1 and drives the new take-up roller. 17 moves upwards and towards the top of the rotating roller 2, ultimately causing the new take-up sleeve 18 with adhesive on the outside of the new take-up roller 17 to roll and adhere to the top of the rotating roller 2 through the supported film roll, completing the material preparation and positioning before the roll change; after the material preparation is completed, the suction pump 35 starts working, relying on the annular transfer groove 33 on the rear side of the rear turntable 3 and the internally rotating transfer sleeve 34 to achieve dynamic and static sealing and ventilation. The suction pump 35 forms a complete negative pressure air path through the suction hole 36, transfer groove 33, frame hole 45, lower groove 44, middle groove 43, and upper groove 42, and finally connects to the hollow groove 51 and rod hole 52 inside the rolling groove 41, so that all the rod holes 52 exposed on the outside of the rolling groove 41 generate stable air. Under constant negative pressure adsorption, the two sets of rolling rods 5 adhere tightly to the inner surface of the film roll through negative pressure adsorption. Simultaneously, the rolling rods 5 can roll freely within the rolling groove 41, without affecting the normal conveying and traction of the film roll, while simultaneously providing all-round, full-coverage width constraint for the entire film roll, completely limiting the width shifting and offset problems during the film roll cutting process. After the film roll adsorption and positioning are completed, the screw motor 64 starts, driving the screw rod 61 to rotate. The screw rod 61 forms a threaded transmission engagement with the cutter holder 6, causing the cutter holder 6 to slide stably laterally along the slide bar 62. This, in turn, causes the cutter 63 on the cutter holder 6 to move rapidly laterally along the overall width of the film roll, cutting the high-toughness, thickened packaging bag film roll. During the cutting process, the membrane roll is fixed by the negative pressure of the rolling bar 5 throughout the entire cutting process, which effectively counteracts the pulling and offset forces caused by the instantaneous shearing impact of the cutter 63, and effectively prevents the problems of local pulling and accumulation, wrinkling and deformation of the membrane roll. After the cutter 63 completes the transverse cutting operation of the entire membrane roll, the suction pump 35 immediately stops working, the negative pressure in the air path quickly disappears, and the bar hole 52 releases the adsorption constraint on the membrane roll. At this time, the new take-up sleeve 18, which is in advance positioned, has its own adhesive layer, which can directly and accurately adhere and fix the end of the disconnected membrane roll. Relying on the continuous rotation of the rotating roller 2 to drive the new take-up sleeve 18 to rotate, a new round of membrane roll winding operation is immediately started, realizing continuous winding without stopping.After the new roll is started, the equipment simultaneously completes the unloading process of the old roll. The central hydraulic cylinder 15 extends further, pushing the central fork 13 to rotate to the left around the hinge point, so that the fork at the end of the central fork 13 gradually lowers and disengages from the old take-up roller 17 that has been wound up. The old take-up roller 17, which is fully loaded with film rolls, slides to the left along the top slope of the frame 1 and automatically falls into the fork position of the left fork 14. Then the left hydraulic cylinder 16 extends, driving the left fork 14 to carry the old take-up roller 17 and the external old film roll and take-up sleeve 18 to complete the unloading and lowering. The operator can directly push the finished old roll to the left to complete the unloading. After the old roll is unloaded, the left hydraulic cylinder 16 and the central hydraulic cylinder 15 retract and reset in sequence, driving the left fork 14 and the central fork 13 to rotate back to the initial standby position. At the same time, the gear motor 37 continues to drive the turntable 3 to rotate counterclockwise, driving the knife holder 31, the rolling bar 5 and the right fork 32 to continue to rotate. Upon resetting, the right fork 32 precisely moves the new take-up roller 17 to the fork position of the middle fork 13. As the turntable 3 continues to rotate counterclockwise, the electric push rod 324 shortens synchronously, causing the right fork 32 to open and disengage from the new take-up roller 17. As the turntable 3 continues to move downward, the turntable 3 drives the knife holder 31 and the right fork 32 to flip to below the turntable 3. The electric push rod 324 extends, causing the fork of the right fork 32 to close and stand by. After the middle fork 13 receives the new take-up roller 17, the central hydraulic cylinder 15 gradually adjusts the extension and retraction amount to adapt to the changes in the take-up thickness of the new take-up sleeve 18, and enters the next round of continuous take-up and automatic roll changing cycle operation. Throughout the operation, the limiting plates 19 on the front and rear sides of the frame 1 always limit the take-up roller 17 to prevent the take-up roller 17 and the take-up sleeve 18 from shifting back and forth, ensuring that the film roll take-up end face is flat and tightly bonded, and continuously ensuring the continuous and stable operation of the production line. This invention utilizes the rolling contact of the film roll with the surface of the rolling rod 5, which, together with the negative pressure adsorption generated by the rod hole 52 exposed outside the rolling groove 41, allows the cutter 63 to adhere to and limit the entire film roll throughout the cutting process as it moves with the cutter holder 6. This counteracts the instantaneous impact force generated by the transverse shearing of the cutter 63, restricts the transverse displacement of the film roll, and ensures that the cut film roll end can be accurately wound onto the outer wall of the winding sleeve 18, thus ensuring the smooth winding of the film roll.

[0025] Example 2: The hollow groove 51 is provided with partitions 53 at intervals; the partitions 53 divide the hollow groove 51 into multiple hollow cavities 511 along the axial direction of the rolling rod 5; the number of upper grooves 42 and middle grooves 43 is the same as the number of hollow cavities 511; the middle groove 43 passes through the air seat 4 near the inner wall of the tool holder 6; the middle strip 46 is slidably and sealed in the middle groove 43; the end of the middle strip 46 is connected to the inner wall of the middle groove 43 by a middle spring 47; a single upper groove 42 is connected to multiple rod holes 52 in the circumferential direction of the rolling rod 5; The upper groove 42 is connected to the middle groove 43 through the upper hole 48; the middle strip 46 has a through hole 461 on both sides; the middle hole 461 is connected to or offset from the upper hole 48 after the middle strip 46 slides along the middle groove 43; the knife holder 6 has a trigger block 65 on both sides; the trigger block 65 has an inclined guide surface 651 at both ends facing outward; the trigger block 65 can squeeze the middle strip 46 away from the middle spring 47 through the guide surface 651; the middle groove 43 is connected to the inner wall of the middle spring 47 and has a pressure stabilizing hole 431 through it facing outward.

[0026] In this embodiment, the contact surface between the cutter 63 and the film roll is a U-shaped blade; the axial length of the trigger block 65 on the rolling bar 5 is greater than the distance between two adjacent middle bars 46; on the axial direction of the rolling bar 5, the trigger block 65 triggers the middle bars 46 to drive the bar hole 52 to adsorb the film roll before the cutter 63 cuts the film roll.

[0027] After the equipment completes the roll changing and material preparation process, the rolling bar 5 lifts and pushes up the film roll, causing the inner side of the film roll to bulge and adhere to the surface of the rolling bar 5, and the new take-up roller 17 and matching adhesive take-up sleeve 18 are precisely in place, the suction pump 35 starts to extract air from the air passage (the air passage includes the lower groove 44, the frame hole 45, and the suction hole 36). In the initial state, the middle bar 46 inside the middle groove 43 is in an extended state under the pushing action of the middle spring 47. At this time, the middle hole 461 on the middle bar 46 is offset from the upper hole 48 at the bottom of the upper groove 42, and each section of the air passage is in a disconnected and blocked state. The upper groove 42, the hollow cavity 511, and the corresponding bar hole 52 cannot form a connected negative pressure. The surface of the rolling bar 5 has no adsorption force, and the film roll is only placed on the surface of the rolling bar 5 without being adsorbed and fixed. After the overall change After the roll structure is fully in place, the screw motor 64 starts and drives the screw rod 61 to rotate. Relying on the threaded transmission structure between the screw rod 61 and the cutter holder 6, the cutter holder 6 is driven to slide linearly back and forth along the slide bar 62. During the movement of the cutter holder 6, the bottom cutter 63 and the trigger blocks 65 on both sides move synchronously along the width of the film roll at a constant speed, preparing to cut the thickened high-toughness film roll. The cutter 63 adopts a U-shaped blade structure, which can stably engage the film roll during the cutting process, restrict the film roll from moving up and down, shifting and tilting, and always maintain a constant cutting height of the film roll, preventing the film roll from leaving the cutting station and ensuring the smoothness of the cutting operation. During the lateral movement of the cutter holder 6, the trigger blocks 65 on both sides, due to their axial distance being greater than that of the two adjacent middle bars 46, take the lead in moving with the cutting block. When the end of the middle strip 46 in the corresponding direction contacts the trigger block 65, the inclined guide surfaces 651 at both ends of the trigger block 65 continuously press the end of the middle strip 46 (the end of the middle strip 46 can be arc-shaped to reduce friction and wear), causing the middle strip 46 to retract and slide inward against the elastic force of the middle spring 47. When the middle strip 46 slides to the designated position, the through hole 461 inside the middle strip 46 is precisely aligned and connected with the upper hole 48 of the upper groove 42, so that the upper groove 42 and the middle groove 43 at the corresponding positions are interconnected with the corresponding independent hollow cavities 511 inside the rolling rod 5. The negative pressure airflow of the suction pump 35 can be smoothly transmitted through the air path to the rod hole 52 position outside the corresponding hollow cavity 511, so that the rod hole 52 generates a stable negative pressure, and performs fixed-point adsorption and fixation on the film roll of the current cutting station and the area to be cut. This achieves precise adsorption at the cutting position as the cutter 63 moves. As the cutter 6 continues to move laterally, the trigger block 65 gradually detaches from the currently pressed middle strip 46. After the middle strip 46 loses its squeezing constraint, it slides outward and resets under the reset force of the middle spring 47. The middle hole 461 and the upper hole 48 are misaligned again, and the air path at the corresponding position is disconnected again. The negative pressure of the rod hole 52 in this section disappears instantly, releasing the adsorption constraint on the film roll in the cut area. At the same time, the trigger block 65 continues to squeeze the next set of middle strips 46 in the direction of travel, starting the negative pressure adsorption in the next area. Throughout the process, the negative pressure adsorption is precisely applied wherever the cutter 63 cuts, achieving a dynamic adsorption effect of precise adsorption positioning in the uncut area and timely pressure release and desorption in the cut area. At the same time, the adsorption force is more concentrated.Meanwhile, the pressure stabilizing hole 431 set inside the middle groove 43 always keeps the internal space of the middle groove 43 connected with the outside atmosphere. During the entire process of the middle strip 46 retracting and extending and sliding, the air pressure inside the middle groove 43 is always balanced with the outside air pressure, avoiding the formation of negative pressure or high pressure jamming inside the middle groove 43, ensuring that the middle strip 46 slides smoothly and without jamming, and ensuring that the negative pressure switching is sensitive and reliable. After the knife holder 6 drives the cutter 63 to complete the transverse cutting of the entire film roll and completely separate it from the film roll operation area, all the middle strips 46 are reset, all the negative pressure of the rod holes 52 is completely released, and the cut end of the new film roll is not bound by adsorption resistance. It can be quickly and flatly attached to the surface of the new winding sleeve 18, and a new round of continuous winding operation can be started smoothly. This invention utilizes a segmented independent hollow cavity 511 air path, a reset-type on / off bar 46 with a central spring 47, and a follow-up trigger block 65, combined with a U-shaped blade structure, to achieve precise negative pressure adsorption at fixed points in the membrane roll cutting area and timely pressure release in the excess area. The concentrated adsorption force improves the positioning stability of the membrane roll, while the pressure stabilizing structure ensures smooth component operation, effectively preventing high-toughness membrane roll cutting deviation and edge curling problems, and improving cutting accuracy and roll changing efficiency.

[0028] Example 3: The blade holder 6 is provided with a sheet groove 66 on the side facing the cutter 63; the cutter 63 is composed of two independent and mutually contacting single blades 632; the single blades 632 are rotatably connected to the sheet groove 66 through a blade shaft 633; ​​after the U-shaped blades of the two single blades 632 enter the film roll, they will drive the two single blades 632 to rotate around the blade shaft 633, so that the U-shaped blades are reduced; the blade shaft 633 and the sheet groove 66 are rotatably connected through a torsion spring (not shown in the figure) for resetting.

[0029] In this embodiment, the tool holder 6 adopts a split structure, and is composed of an upper half and a lower half that are inserted together; the upper half and the lower half of the tool holder 6 are connected by a rectangular block 67 and a rectangular slot 68; the rectangular slot 68 extends outward and is threadedly connected to a bolt 69.

[0030] When the equipment is cutting film rolls, the blade position can be pre-adjusted according to the actual thickness specifications of the film roll to be processed. Operators can fine-tune the insertion limit position of the rectangular block 67 inside the rectangular groove 68 by rotating bolt 69, thereby precisely changing the assembly distance between the upper and lower halves of the blade holder 6. This allows for fine-tuning of the position of the cutter 63 as it moves closer to or further away from the turntable 3, ensuring that the cutting position of film rolls of different thicknesses is accurately aligned with the center of the included angle of the U-shaped blade of the cutter 63, guaranteeing accurate alignment for cutting various thickness film rolls. With enhanced adaptability, it ensures consistent positioning of the blades on both sides of the film roll after retraction. After position adjustment, the blade holder 6 is driven by the screw 61 to move laterally at a uniform speed along the slide bar 62, driving the cutter 63 to move towards the width of the film roll and begin the cutting operation. The cutter 63 is composed of two independent single blades 632 that are in close contact with each other. The two sets of single blades 632 are rotated and assembled through the blade shaft 633 in the slot 66 of the blade holder 6. In the initial state, the two sets of single blades 632 are kept open under the action of the torsion spring, so that the whole forms a U-shape with a larger opening. The initial cutting edge, with its large opening, can easily align and be incorporated into the edge of the membrane roll, offering higher tolerance for errors. As the cutter 63 continues to feed and the U-shaped cutting edge fully penetrates the membrane roll, the moving membrane roll exerts a continuous compressive reaction force on the inner slopes of the two sets of single blades 632. This forces the two sets of single blades 632 to overcome the preload of the built-in torsion springs and rotate relative to each other around the corresponding blade axis 633, causing the opening angle of the U-shaped cutting edge to actively decrease. The retracted cutting edge can be tightly confined on both sides of the cutting seam (under the action of the limiting point 634, the cutting edge...). It will not bend and close (slightly larger than the thickness of the membrane roll), forming a rigid limit on the membrane roll in the cutting area, effectively restricting the high-toughness thickened membrane roll from moving up and down, locally lifting and shifting left and right during the cutting process, so that the blade always keeps in contact with the cutting position of the membrane roll and feeds stably, ensuring that the cutting line of the entire membrane roll is flat and the cut is uniform. After the cutter 63 completes the entire cutting and detaches from the membrane roll, the single blade 632 loses the membrane roll compression constraint and automatically opens and resets under the action of the torsion spring, restoring the initial state of the large opening, waiting for the next cutting operation; This invention combines two flip-up single blades 632 to form an adaptive opening and closing U-shaped blade structure, which works in conjunction with the blade shaft 633 and the torsion spring structure. This allows the blade to initially maintain a large opening for quick material feeding. During the cutting process, the blade automatically closes under the pressure of the film roll, reducing the blade opening. This achieves clamping and limiting of the high-toughness film roll during the cutting process, effectively suppressing problems such as film roll warping, offset, and slippage, and significantly improving the flatness of the film roll cut and the cutting stability.

[0031] Example 4: The gas seat 4 is provided with an arc-shaped groove 49 on the inner wall of the rolling groove 41 at the end away from the turntable 3; an arc-shaped strip 7 is movably and sealed in the arc-shaped groove 49; the arc-shaped strip 7 is connected to the support block 72 fixed in the arc-shaped groove 49 by an arc-shaped spring 71; an ear strip 8 is provided on the end of the arc-shaped strip 7 away from the arc-shaped spring 71.

[0032] In this embodiment, the arc-shaped strip 7 is composed of multiple arc-shaped blocks 74 that are sealed and contacted with each other and combined; the arc-shaped blocks 74 are connected to independent arc-shaped springs 71; the ear strip 8 is composed of multiple ear blocks 81; the ear blocks 81 are fixedly connected to independent arc-shaped blocks 74.

[0033] When the equipment is in its initial standby state, the arc spring 71 installed inside the arc groove 49 at the end of the air seat 4 away from the turntable 3 remains extended, continuously pushing the arc strip 7 to fit and block the opening of the rolling groove 41 and the outer side of the rolling rod 5. Normally, the arc strip 7 covers the outer wall of the rolling rod 5, blocking the rod hole 52 on the outer side of the rolling rod 5. When the turntable 3 rotates counterclockwise, it causes the air seat 4 and the rolling rod 5 to flip and lift upwards, causing the rolling rod 5 to lift the membrane roll and bulge the inner side of the membrane roll, pressing it firmly against the surface of the rolling rod 5. The membrane roll will squeeze the ear strip 8 of the outward-facing structure. The squeezing force drives the arc strip 7 to overcome the elastic force of the arc spring 71 and slide inward along the arc groove 49 to retract. The ear strip 8 will be close to the inside of the membrane roll, so that only the part of the rolling rod 5 that is in contact with the membrane roll is exposed, while the other parts are covered by the arc strip 7. This makes the adsorption more concentrated in the subsequent negative pressure adsorption process and improves the adsorption effect on the membrane roll. Furthermore, the arc strip 7 is formed by sealing and contacting multiple independent arc blocks 74, and the ear strip 8 is composed of multiple independent ear blocks. The system consists of 81 components, with each set of arc-shaped blocks 74 individually matched with an arc-shaped spring 71 for independent driving. During the cutting process, when the rolling rod 5 lifts and supports the film roll, only the corresponding ear blocks 81 that are compressed and squeezed by the film roll can drive the corresponding independent arc-shaped blocks 74 to overcome the elastic force of the arc-shaped springs 71 and retract, exposing the local rod holes 52 to achieve negative pressure adsorption. The front and rear ear blocks 81 and their corresponding arc-shaped blocks 74 that are not compressed by the film roll maintain an outward convex shape under the support of the independent arc-shaped springs 71. The state will not produce a retraction action; each segment of the arc block 74 and ear block 81 is independent and does not interfere with each other, and can accurately correspond to the actual coverage area of ​​the membrane roll to achieve local clearance and exposure. At the same time, the non-retractable protruding ear blocks 81 on the front and rear sides can form physical guards on both sides in the width direction of the membrane roll, which limits the front and rear of the membrane roll and restrains the front and rear movement and deviation of the membrane roll during the cutting process. After the membrane roll is detached, each set of independent arc springs 71 drives the corresponding arc block 74 and ear block 81 to automatically reset, completing a single cutting cycle action. This invention utilizes the arc-shaped spring 71 and arc-shaped strip 7 inside the arc-shaped groove 49 of the air seat 4, along with the outward-facing ear strip 8, to achieve adaptive opening and closing of the area blocked by the rod hole 52 of the rolling rod 5 according to the film roll bonding position. Only the working area is exposed to generate negative pressure, effectively concentrating the negative pressure adsorption force, reducing negative pressure airflow loss, improving the adsorption and fastening effect of the film roll bonding area, and ensuring the basic stability of the cutting operation. This invention also utilizes multiple independent split arc-shaped blocks 74 and ear blocks 81, along with independent arc-shaped springs 71, to achieve a precise adaptive opening and closing effect with local pressure and local relocation. At the same time, the unpressurized ear blocks 81 form limiting edges on both sides, effectively restricting the film roll from shifting or deviating during the cutting process, further improving the positioning accuracy and forming flatness of the high-toughness film roll cutting process.

[0034] In the description of this invention, it should be noted that the terms "center," "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicate the orientation or positional relationship based on the appendix. Figure 1 The orientations or positional relationships shown are for the convenience of describing the present invention and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limiting the scope of protection of the present invention. In addition, the terms "first," "second," "third," etc. are only used to distinguish descriptions and should not be construed as indicating or implying relative importance. In the description of the present invention, "fixed connection" refers to a fixed connection. In the description of the present invention, "sliding connection" refers to a connection where the two parts can only slide and cannot be separated. Specifically, the groove can be set to be concave and the block can be set to be convex, and the specific design can be adjusted according to the actual situation. "Sliding fit" refers to a connection where the two parts can slide and separate. In the description of the present invention, "rotational connection" refers to a connection where the two parts can only rotate and cannot produce axial displacement. Specifically, an annular groove can be provided on the inner wall of the hole, and a ring that is rotatably connected to the groove can be fixed to the outer wall of the shaft.

[0035] The foregoing has shown and described the basic principles, main features, and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of the invention. Various changes and modifications can be made to the invention without departing from its spirit and scope, and all such changes and modifications fall within the scope of the present invention as claimed. The scope of protection of the present invention is defined by the appended claims and their equivalents.

Claims

1. An automatic material changing and rewinding device for packaging bag film rolls, comprising a U-shaped frame and a rotating roller rotatably connected to the inner side of the frame via a rotating shaft; the rotating shaft is driven by a main motor; characterized in that: The inner side of the frame is rotatably connected to the guide roller and two input rollers towards the right side of the rotating roller; the inner side of the frame is rotatably connected to the middle fork and the left fork towards the left side of the rotating roller; the middle section of the middle fork is hinged to the inner wall of the frame via a central hydraulic cylinder; the middle section of the left fork is hinged to the outer wall of the frame via a left hydraulic cylinder; the outer walls of both ends of the rotating shaft are rotatably connected to the turntable; the outer wall of the turntable is fixedly connected to the tool holder and the right fork; the inner sides of the two tool holders are fixedly connected by two air seats; the air seats are located outside the rotating roller and are not in contact with the rotating roller; the end of the air seat away from the rotating roller. A rolling groove is provided; a rolling rod is rolled and sealed within the rolling groove; the end of the rolling rod is rotatably and sealed to the tool holder; a hollow groove is provided inside the rolling rod; the hollow groove communicates with the outer wall of the rolling rod through a rod hole; an upper groove is provided on the wall of the rolling groove, communicating with the rod hole; the upper groove is connected to a suction pump; a screw rod and a slide rod are rotatably connected to the inner sides of the two tool holders; the slide rod is slidably connected to a tool holder with a cutting blade; the tool holder is threadedly connected to the screw rod; the screw rod is driven by a screw motor; the turntable is driven to rotate by a gear motor.

2. The automatic material changing and rewinding device for packaging bag film rolls according to claim 1, characterized in that: An external gear ring is fixedly connected to the front side of the turntable at the front position; the external gear ring meshes with a gear; the gear is driven by a gear motor; an annular transfer groove is provided on the rear side of the turntable at the rear position; a transfer sleeve is rotatably and sealingly connected inside the transfer groove; a suction pump is fixedly connected to the outer wall of the transfer sleeve; the housing of the suction pump is fixedly connected to the inner side of the frame; the suction pump is connected to the transfer groove through a suction hole; the upper groove is connected to the transfer groove in sequence through the middle groove, the lower groove, and the frame hole; the top of the frame overlaps the front and rear receiving rollers; the outer wall of the receiving roller is fitted with an adhesive receiving sleeve.

3. The automatic material changing and rewinding device for packaging bag film rolls according to claim 2, characterized in that: The fork of the left fork faces right; the fork of the middle fork is away from the hinge point; the fork of the right fork is away from the turntable; the right fork is composed of a fork body, a first fork head, a second fork head, and an electric push rod; the fork body is fixedly connected to the turntable; the first fork head is fixedly connected to the end of the fork body away from the turntable and near the tool holder; the second fork head is hinged to the end of the fork body away from the turntable and away from the tool holder; the length of the first fork head is less than that of the second fork head; the electric push rod is hinged to the outer wall of the second fork head through the outer wall of the turntable; the front and rear sides of the frame are fixedly connected to the limiting plates by limiting blocks; the distance between the two limiting plates is adapted to the length of the take-up roller.

4. The automatic material changing and rewinding device for packaging bag film rolls according to claim 1, characterized in that: The hollow groove is provided with partitions at intervals; the partitions divide the hollow groove into multiple hollow cavities along the axial direction of the rolling rod; the number of upper grooves and middle grooves is the same as the number of hollow cavities; the middle groove is close to the inner wall of the tool holder and has an air seat through it; a middle strip is slidably and sealed in the middle groove; the end of the middle strip is connected to the inner wall of the middle groove by a middle spring; a single upper groove is connected to multiple rod holes in the circumferential direction of the rolling rod; the upper groove is connected to the middle groove through an upper hole; a middle hole is provided through both sides of the middle strip; the middle hole is connected to or offset from the upper hole after the middle strip slides along the middle groove; trigger blocks are provided on both sides of the tool holder; the trigger blocks have inclined guide surfaces at both ends facing outwards; the trigger blocks can squeeze the end of the middle strip away from the middle spring through the guide surfaces; a pressure stabilizing hole is provided through the inner wall of the middle groove that abuts against the middle spring.

5. The automatic material changing and rewinding device for packaging bag film rolls according to claim 4, characterized in that: The contact surface between the cutter and the film roll is a U-shaped blade; the axial length of the trigger block on the rolling bar is greater than the distance between two adjacent center bars; on the axial direction of the rolling bar, the trigger block triggers the center bars to drive the bar holes to adsorb the film roll before the cutter cuts the film roll.

6. The automatic material changing and rewinding device for packaging bag film rolls according to claim 5, characterized in that: The blade holder has a sheet groove on the side facing the cutter; the cutter is composed of two independent and mutually contacting single blades; the single blades are rotatably connected to the sheet groove via a blade shaft; after the U-shaped blades of the two single blades enter the film roll, they will drive the two single blades to rotate around the blade shaft, thereby reducing the size of the U-shaped blades; the blade shaft and the sheet groove are rotatably connected by a torsion spring.

7. The automatic material changing and rewinding device for packaging bag film rolls according to claim 6, characterized in that: The tool holder adopts a split structure, consisting of an upper half and a lower half that are inserted together; the upper half and the lower half of the tool holder are connected by a rectangular block and a rectangular slot; the rectangular slot extends outward and is threaded with a bolt.

8. The automatic material changing and rewinding device for packaging bag film rolls according to claim 4, characterized in that: The gas seat has an arc-shaped groove at the end away from the turntable, which is attached to the inner wall of the rolling groove; an arc-shaped strip is movably and sealed within the arc-shaped groove; the arc-shaped strip is connected to a support block fixed within the arc-shaped groove via an arc-shaped spring; and an ear strip is provided at the end of the arc-shaped strip away from the arc-shaped spring.

9. The automatic material changing and rewinding device for packaging bag film rolls according to claim 8, characterized in that: The arc-shaped strip is composed of multiple arc-shaped blocks that are sealed and in contact with each other and combined; the arc-shaped blocks are connected to independent arc-shaped springs; the ear strip is composed of multiple ear blocks; the ear blocks are fixedly connected to independent arc-shaped blocks.

Images