Packaging bag film roll unwinding device
By designing a packaging bag film roll unwinding device, the frictional contact between the pressure bar and the guide roller, as well as the inertial force of the eccentric rod, solves the problem of tensile tearing caused by static friction and rigid rebound in traditional unwinding, thus achieving stable unwinding and efficient conveying of the film roll.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2026-03-11
- Publication Date
- 2026-04-10
- Estimated Expiration
- Not applicable · inactive patent
AI Technical Summary
Traditional packaging bag film rolls are stretched and torn during the unwinding process due to static friction and rigid rebound resistance, which affects production efficiency.
A packaging bag film roll unwinding device was designed, including a feeding mechanism and a guiding mechanism. The film roll is unwound in stages by the up-and-down swing of the pressure rod and the frictional contact of the guide roller. The unwinding resistance is reduced by combining the eccentric rod and inertial force.
It effectively prevents the film roll from stretching, deforming, or tearing, improves the integrity of the packaging bag film during transport, reduces unwinding resistance, and increases production efficiency.
Smart Images
Figure CN121823280A_ABST
Abstract
Description
Technical Field
[0001] This invention belongs to the field of packaging bag production technology, and specifically relates to a packaging bag film roll unwinding device. Background Technology
[0002] Packaging bags are bags used to package various goods, facilitating transportation and storage during production and distribution. They are widely used in daily life and industrial production. In packaging bag production, pre-printed film rolls are typically placed at one end of a packaging bag production line. As the line operates, the film rolls are unwound, and the unwound film is processed to form the packaging bags.
[0003] In traditional unwinding, the production line's traction unit directly pulls the packaging film from the unwinding roller, forming a large roll. As traction continues, the packaging film is continuously consumed until one roll is used up, at which point the next roll can be replaced. However, due to the large volume and diameter of the packaging film roll, the static friction between the film layers is high. During the initial unwinding process, it is necessary to overcome the static friction between the film layers and the rigid rebound resistance of the packaging film. Furthermore, the long traction path can easily lead to stretching and tearing of the packaging film, causing production line downtime and affecting production efficiency. Summary of the Invention
[0004] The purpose of this invention is to provide a packaging bag film roll unwinding device with a simple structure and reasonable design in order to solve the above-mentioned problems.
[0005] The present invention achieves the above objectives through the following technical solutions: A packaging bag film roll unwinding device, comprising: The feeding mechanism includes a support, a pressing drive assembly, and a pressing rod. The support is used to support the film roll body, and the output end of the pressing drive assembly is connected to the pressing rod. The guiding mechanism includes a mounting frame, a first guide roller, a first pressure plate, a first pressing drive, a third guide roller, a second pressure plate, and a second pressing drive. The first guide roller and the third guide roller are respectively mounted on the mounting frame and are located above the pressing rod. The output end of the first pressing drive is driven to the first pressure plate, and the output end of the second pressing drive is driven to the second pressure plate. The unwinding end of the packaging bag film on the film roll body passes around the third guide roller, the pressing rod, and the first guide roller in sequence, and the packaging bag film rubs against the third guide roller, the pressing rod, and the first guide roller respectively. When the pressure bar swings down, the first pressure plate moves to frictionally contact the packaging film on the first guide roller, and the second pressure plate is in the initial position; when the pressure bar swings up under the drive of the pressure drive assembly, the first pressure plate moves to the initial position, and the second pressure plate moves to frictionally contact the packaging film on the third guide roller.
[0006] As a further optimization of the present invention, the guiding mechanism further includes a second guide roller, which is located between the first guide roller and the pressure bar. The unwinding end of the packaging bag film on the film roll body passes sequentially around the third guide roller, the pressure bar, the second guide roller, and the first guide roller.
[0007] As a further optimization of the present invention, the pressing drive assembly includes a rotating drive component, a sector gear, a driven gear, a transmission block, and a swing arm. The output end of the rotating drive component is connected to the sector gear, which meshes with the driven gear. The driven gear is fixedly connected to the transmission block, and the transmission block is fixedly connected to the swing arm. The end of the swing arm away from the transmission block is rotatably connected to a pressing rod. During the upward swing of the pressing rod, the sector gear and the driven gear mesh with each other. During the downward swing of the pressing rod, the sector gear and the driven gear disengage.
[0008] As a further optimization of the present invention, the swing arm is inclined along the upward swing direction of the pressure rod, and a counterweight is provided on the rear side of the transmission block. When the pressure rod is in the initial position, the transmission block is located at the lowest position of the swing trajectory.
[0009] As a further optimization of the present invention, the film roll body includes a roll and a roller. The roll is rotatably sleeved on the roller, and the packaging film to be unwound is wound on the roll. Eccentric rods are fixedly provided at both ends of the roller along the axial direction. The support is provided with a support groove. When the film roll body is in the feeding position, the eccentric rods are supported on the support through the support groove.
[0010] As a further optimization of the present invention, the axis of the eccentric rod is eccentrically set to the axis of the roller, a limiting rod is fixedly connected to the end of the eccentric rod away from the roller, a limiting block is fixedly connected to the side end of the limiting rod, a limiting groove is formed on the transmission block, and the limiting block is engaged with the transmission block through the limiting groove.
[0011] As a further optimization of the present invention, the rotation drive is mounted on the lifting seat, and the lower end of the lifting seat is fixedly connected to the output end of the lifting drive.
[0012] As a further optimization of the present invention, a feeding mechanism is also included, which is used to move the film roll body from the initial position to the feeding position.
[0013] As a further optimization of the present invention, the feeding mechanism includes a second shifting drive, a swing frame, a sliding frame, a third shifting drive, and a gripper. The second shifting drive is rotatably mounted on the mounting frame, and the output end of the second shifting drive is rotatably connected to the swing frame. The upper end of the swing frame is rotatably mounted on the mounting frame, and the lower end of the swing arm is slidably mounted to the sliding frame. The third shifting drive is mounted on one side of the swing frame, and the output end of the third shifting drive is fixedly connected to the sliding frame. A gripper is provided at the end of the sliding frame away from the swing frame. Clamping grooves are respectively opened at both ends of the roller, and the gripper is correspondingly arranged with the clamping grooves. The gripper is used to clamp and fix the roller through the clamping grooves.
[0014] As a further optimization of the present invention, a base is provided on one side of the mounting frame. When the film roll body is in the initial position, the eccentric rod is mounted on the base, and the axial end face of the roll is limited and abuts against the side end face of the base.
[0015] The present invention has at least the following beneficial effects: The packaging bag film roll unwinding device provided by the present invention includes an unwinding mechanism and a guiding mechanism. The unwinding mechanism includes a bracket, a pressing drive assembly, and a pressing rod. The guiding mechanism includes a mounting frame, a first guide roller, a first pressure plate, a first pressing drive component, a third guide roller, a second pressure plate, and a second pressing drive component. When the pressing rod swings downward, the first pressure plate moves to frictionally abut against the packaging bag film on the first guide roller, and the second pressure plate is in its initial position. When the pressing rod swings upward under the drive of the pressing drive assembly... The first pressure plate moves to the initial position, and the second pressure plate moves to frictionally contact the packaging film on the third guide roller to pre-unwind the packaging film before it is pulled. This achieves step-by-step unwinding and pulling of the packaging film. Compared with the traditional direct pulling and unwinding method, it greatly shortens the pulling path and avoids local stress concentration caused by tension fluctuations, interlayer static friction and rigid rebound resistance in traditional long-path pulling. With the friction contact limit between the pressure bar and the guide roller, it effectively prevents the packaging film from being stretched, deformed or torn, and improves the integrity of the packaging film conveying. Furthermore, an eccentric rod is provided at the end of the film roll body. The axis of the eccentric rod is eccentrically set with the axis of the roll. When the pressure rod swings down counterclockwise, the roll deflects and swings down around the axis of the eccentric rod. Under the action of inertial force, the roll rotates counterclockwise relative to the roll, which promotes the unwinding of the packaging film. The pressure rod also swings down under the action of gravity, which further increases the counterclockwise swing intensity of the roll. Moreover, the downward swing of the pressure rod pulls the packaging film. Combined with the aforementioned inertial unwinding of the roll, compared with the traditional film roll being rigidly pulled over a long distance when stationary, the unwinding resistance of the packaging film is significantly reduced. Attached Figure Description
[0016] Figure 1 This is a schematic diagram of the overall structure of the present invention; Figure 2 This is the invention Figure 1 A schematic diagram of a partial sectional view of the frontal structure; Figure 3 This is a schematic diagram of the structure of the film roll body and the feeding mechanism of the present invention in their initial positions; Figure 4 This is the present invention. Figure 3 A front view schematic diagram of the structure of the middle membrane roll body, the limiting rod, and the limiting block; Figure 5 This is a partial structural schematic diagram of the feeding mechanism of the present invention; Figure 6 This is a schematic diagram of the structure of the film roll body and the feeding mechanism of the present invention when they are in the feeding position; Figure 7 The present invention Figure 6 Enlarged view of point A in the middle; Figure 8 This is the invention Figure 2 A schematic diagram of the overall structure of the medium-film roll body when it is in the feeding position; Figure 9 This is a partial cross-sectional view of the guiding mechanism, film roll body and feeding mechanism of the present invention when they are in the feeding position. Figure 10 This is a partial structural diagram of the packaging bag film of the present invention when the pressure bar is at the upper swing end position; Figure 11 This is a partial cross-sectional view of the guiding mechanism, film roll body and unwinding mechanism of the present invention when they are in the unwinding position. Figure 12 This is the present invention. Figure 1 A schematic diagram of the feeding mechanism.
[0017] In the diagram: 1. Membrane roll body; 11. Roller; 12. Roller roller; 13. Clamping groove; 101. Base; 2. Feeding mechanism; 21. Rotary drive component; 22. Sector gear; 23. Driven gear; 24. Transmission block; 241. Limiting groove; 242. Counterweight block; 25. Bracket; 251. Support groove; 26. Swing arm; 27. Pressure rod; 28. Lifting seat; 29. Lifting drive component; 210. Limiting rod; 211. Limiting block; 212. Eccentric rod; 3. Guiding mechanism; 31. First guide roller; 311. First pressure plate; 312. First pressing drive; 32. Second guide roller; 33. Third guide roller; 331. Second pressure plate; 332. Second pressing drive; 34. Mounting frame; 4. Feeding mechanism; 41. Second shifting drive; 42. Swing frame; 43. Sliding frame; 44. Third shifting drive; 45. Gripper. Detailed Implementation
[0018] The present application will now be described in further detail with reference to the accompanying drawings. It should be noted that the following specific embodiments are only used to further illustrate the present application and should not be construed as limiting the scope of protection of the present application. Those skilled in the art can make some non-essential improvements and adjustments to the present application based on the above application content.
[0019] In the description of the embodiments of this application, it should be understood that the terms "upper", "lower", "clockwise", "counterclockwise", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship that the product of this application is usually placed in, or the orientation or positional relationship that is commonly understood by those skilled in the art. They are only for the convenience of describing this application and simplifying the description, and are not intended to indicate or imply that the device or component referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application.
[0020] like Figure 1 , Figure 2 and Figure 3 As shown, the present invention provides a packaging bag film roll unwinding device, comprising: The feeding mechanism 2 includes a bracket 25, a pressing drive assembly and a pressing rod 27. The bracket 25 is used to support the film roll body 1, and the output end of the pressing drive assembly is connected to the pressing rod 27. The guiding mechanism 3 includes a mounting frame 34, a first guide roller 31, a first pressure plate 311, a first pressing drive 312, a third guide roller 33, a second pressure plate 331, and a second pressing drive 332. The first guide roller 31 and the third guide roller 33 are respectively mounted on the mounting frame 34, and the first guide roller 31 and the third guide roller 33 are respectively located above the pressing rod 27. The output end of the first pressing drive 312 is drivenly connected to the first pressure plate 311, and the output end of the second pressing drive 332 is drivenly connected to the second pressure plate 331. The unwinding end of the packaging bag film on the film roll body 1 passes around the third guide roller 33, the pressing rod 27, and the first guide roller 31 in sequence, and the packaging bag film rubs against the third guide roller 33, the pressing rod 27, and the first guide roller 31 respectively. When the pressure bar 27 swings down, the first pressure plate 311 moves to frictionally contact the packaging film on the first guide roller 31, and the second pressure plate 331 is in the initial position (i.e., the position where the second pressure plate 331 and the packaging film are spaced apart); when the pressure bar 27 swings up under the drive of the pressure driving assembly, the first pressure plate 311 moves to the initial position (i.e., the position where the first pressure plate 311 and the packaging film are spaced apart), and the second pressure plate 331 moves to frictionally contact the packaging film on the third guide roller 33.
[0021] Continue reading Figure 8 The dotted line in the diagram represents the trajectory of the packaging film being bent and wrapped. At this point, the pressure rod 27 is in its initial position, meaning that under the contact of the pressure rod 27, the amount of packaging film between the first guide roller 31 and the third guide roller 33 is at its maximum. (Continue reading...) Figure 9 At this time, driven by the second pressing drive 332, the second pressing plate 331 moves down to abut the packaging film against the third guide roller 33, while the first pressing plate 311 is in the initial position, that is, the first pressing plate 311 does not limit the packaging film on the first guide roller 31. At this time, the guiding mechanism 3 and the film roll body 1 are in the unwound position, so that under the traction in the direction of the dotted arrow, the packaging film moves along the conveying direction. At the same time, driven by the pressing drive assembly, the pressing rod 27 swings up, so that the packaging film between the first guide roller 31 and the third guide roller 33 is gradually loosened and conveyed. Figure 11 The dashed line indicates a decrease in the amount of packaging film between the first guide roller 31 and the third guide roller 33. During this process, the pressure bar 27 remains in frictional contact with the packaging film. When the packaging film is conveyed after the packaging bag processing at the front of the production line stops, the first pressure plate 311 moves down to rub against the packaging film on the first guide roller 31, and the second pressure plate 331 moves up to its initial position. At this time, the pressure bar 27 swings down to its initial position (i.e., the film roll body 1 is located at...). Figure 2 In the initial position shown (where the stationary pressure bar 27 is located), it only pulls the packaging film off the film roll body 1, without pulling the packaging film in front of the first guide roller 31 in the opposite direction. This allows the packaging film to be unwound first between the first guide roller 31 and the third guide roller 33, realizing the step-by-step unwinding and traction of the packaging film. Compared with the traditional direct traction unwinding method, it greatly shortens the traction path and avoids the local stress concentration caused by tension fluctuations, interlayer static friction and rigid rebound resistance in the traditional long-path traction. Combined with the frictional contact limit between the pressure bar 27 and the guide roller, it effectively prevents the packaging film from being stretched, deformed or torn, and improves the integrity of the packaging film conveying.
[0022] For example, see [link to relevant documentation]. Figure 2 The guiding mechanism 3 further includes a second guide roller 32, which is located between the first guide roller 31 and the pressure bar 27. The unwinding end of the packaging bag film on the film roll body 1 passes sequentially around the third guide roller 33, the pressure bar 27, the second guide roller 32, and the first guide roller 31. (Continue reading...) Figure 8 This increases the included angle of the packaging film on the pressure bar 27, thereby further reducing the contact area between the packaging film and the pressure bar 27 and reducing friction.
[0023] For example, see [link to relevant documentation]. Figure 2 , Figure 3 and Figure 5The pressing drive assembly includes a rotating drive component 21, a sector gear 22, a driven gear 23, a transmission block 24, and a swing arm 26. The output end of the rotating drive component 21 is connected to the sector gear 22, which meshes with the driven gear 23. The driven gear 23 is fixedly connected to the transmission block 24, and the transmission block 24 is fixedly connected to the swing arm 26. The end of the swing arm 26 away from the transmission block 24 is rotatably connected to a pressing rod 27. During the upward swing of the pressing rod 27, the sector gear 22 and the driven gear 23 mesh and drive each other. During the downward swing of the pressing rod 27, the sector gear 22 and the driven gear 23 disengage.
[0024] It should be noted that, for example Figure 3 and Figure 6 As shown, the pressure drive components are arranged in pairs, with the two ends of the pressure rod 27 rotatably connected to the corresponding swing arm 26, and the rotation drive component 21 is a drive motor.
[0025] Combination Figure 10 Driven by the rotating drive component 21, the sector gear 22 rotates counterclockwise in the direction of the arrow, thereby meshing with the driven gear 23 clockwise (towards...). Figure 10 (Taking the orientation shown as an example) The rotation further causes the transmission block 24 to drive the pressure rod 27 to swing clockwise through the swing arm 26, so as to realize the upward swing of the pressure rod 27, so as to reduce the traction resistance when the packaging bag film is pulled by the production end; while the sector gear 22 continues to rotate, the sector gear 22 and the driven gear 23 do not mesh, and under the action of the weight of the pressure rod 27, it swings down and presses down on the packaging bag film.
[0026] Among them, such as Figure 5 As shown, along the upward swing direction of the pressure rod 27, the swing arm 26 is inclined, and a counterweight 242 is provided on the rear side of the transmission block 24. When the pressure rod 27 is in its initial position, that is, when the pressure rod 27 is in a state of gravity equilibrium, the counterweight 242 causes the swing arm 26 to be in an inclined position. The inclined swing arm 26 effectively prevents interference between the packaging film between the pressure rod 27 and the third guide roller 33 and the packaging film on the film roll body 1. At this time, the transmission block 24 is located at the lowest position of the swing trajectory. It should be noted that the counterweight 242 is bolted to the transmission block 24.
[0027] Continue reading Figure 3The film roll body 1 includes a roll 11 and a roller 12. The roll 11 is rotatably sleeved on the roller 12. When the bag film is being pulled, the roll 11 can rotate around the roller 12 to reduce the traction resistance. The roll 11 is wound with packaging film to be unwound. Eccentric rods 212 are fixedly provided at both ends of the axial direction of the roller 12. The bracket 25 is provided with a support groove 251. When the film roll body 1 is in the feeding position, the eccentric rods 212 are supported on the bracket 25 through the support groove 251. After the packaging bag film is unwound, the roll 11 can be removed from the roller 12 to replace the next roll 11. For example, pins are provided on the roller 12 to limit the roll 11 between two pairs of pins to ensure the installation accuracy between the roll 11 and the roller 12.
[0028] For example, see [link to relevant documentation]. Figure 3 and Figure 4 The eccentric rod 212 is eccentrically positioned to the axis of the roller 12. A limiting rod 210 is fixedly connected to the end of the eccentric rod 212 away from the roller 12. A limiting block 211 is fixedly connected to the side end of the limiting rod 210. A limiting groove 241 is provided on the transmission block 24. The limiting block 211 engages with the transmission block 24 through the limiting groove 241.
[0029] In the above embodiments, in the initial state, such as Figure 4 As shown, the centerline of the drum 11 is located directly below the centerline of the eccentric rod 212. (Continue reading...) Figure 10 and Figure 11 Driven by the rotation drive 21, when the swing arm 26 swings clockwise upwards, the transmission block 24 drives the winding roller 12 to swing synchronously clockwise via the limit rod 210 and the eccentric rod 212. At this time, the center of gravity of the film roll body 1 is deflected relative to the axis of the eccentric rod 212. Figure 11 As shown, when the pressure bar 27 swings down counterclockwise, the film roll body 1 also swings down in its own eccentric state to facilitate the smooth swing of the pressure bar 27. It should be further explained that, due to the rotational cooperation between the roll 11 and the roller 12, when the roller 12 swings down relative to the eccentric bar 212, the roll 11 will also rotate relative to the roller 12 to reduce the downward traction resistance of the pressure bar 27 on the packaging bag film when it swings down.
[0030] For example, see [link to relevant documentation]. Figure 5 The rotation drive component 21 is mounted on the lifting base 28, and the lower end of the lifting base 28 is fixedly connected to the output end of the lifting drive component 29. (Continue reading...) Figure 6After the eccentric rod 212 is placed on the support groove 251 of the bracket 25, and the gravity of the film roll body 1 is balanced, the limiting block 211 on the limiting rod 210 is positioned directly below. Thus, under the drive of the lifting drive component 29, the lifting seat 28 moves upward, so that the limiting groove 241 and the limiting block 211 are engaged. It should be noted that the lifting drive component 29 can be a hydraulic telescopic cylinder, an electric telescopic cylinder, or an electrical telescopic cylinder, and is not limited here.
[0031] For example, see [link to relevant documentation]. Figure 1 The packaging bag film roll unwinding device also includes a feeding mechanism 4, which is used to move the film roll body 1 from the initial position to the feeding position.
[0032] Continue reading Figure 12 The feeding mechanism 4 includes a second shifting drive 41, a swing frame 42, a sliding frame 43, a third shifting drive 44, and a gripper 45. The second shifting drive 41 is rotatably mounted on the mounting frame 34. The output end of the second shifting drive 41 is rotatably connected to the swing frame 42. The upper end of the swing frame 42 is rotatably mounted on the mounting frame 34. The lower end of the swing arm 26 is slidably mounted on the sliding frame 43. The third shifting drive 44 is mounted on one side of the swing frame 42. The output end of the third shifting drive 44 is fixedly connected to the sliding frame 43. A gripper 45 is provided at the end of the sliding frame 43 away from the swing frame 42. The two ends of the roller 12 are respectively provided with clamping grooves 13. The gripper 45 is correspondingly provided with the clamping grooves 13. The gripper 45 is used to clamp and fix the roller 12 through the clamping grooves 13.
[0033] The second shifting drive 41 drives the swing frame 42 to swing, adjusting its angle and direction. The third shifting drive 44 drives the sliding frame 43 to adjust the distance between the gripper 45 and the winding roller 12. With the cooperation of the second and third shifting drive 41, the film roll body 1 is moved from... Figure 1 The initial position shown is clamped to Figure 6 At the feeding position shown, for the unwound roll 12, the roll 12 can be removed from the feeding position by means of the cooperation of the second shift drive 41 and the third shift drive 44, and a new roll 11 can be installed.
[0034] Continue reading Figure 1 and Figure 2 The mounting frame 34 has a base 101 on one side. When the film roll body 1 is in the initial position, the eccentric rod 212 is mounted on the base 101, and the axial end face of the roller 12 is limited and abutted against the side end face of the base 101 to initially limit the film roll body 1 to the base 101, so that the gripper 45 can accurately clamp the roller 12 and place it on the bracket 25.
[0035] It should be noted that the second shifting drive 41 and the third shifting drive 44 are respectively a hydraulic telescopic cylinder, an electric telescopic cylinder, and an electrical telescopic cylinder, which are not specified here.
[0036] It should be noted that, in use, the film roll unwinding device places the film roll body 1 onto the base 101. At this time, due to the eccentric arrangement between the roller 12 and the limiting rod 210, the axis of the roller 12 is positioned directly below the axis of the limiting rod 210. Figure 4 As shown, then, with the synergistic action of the second shifting drive 41 and the third shifting drive 44, the gripper 45 engages with the clamping groove 13, thereby moving the membrane roll body 1 from... Figure 2 The initial position shown is moved to Figure 6 and Figure 8 The material feeding position is shown. Then, under the reverse drive of the third shift drive 44, the sliding frame 43 is retracted. At this time, the pressure rod 27 is in the initial position, and the traction end of the packaging bag film passes through the third guide roller 33, the pressure rod 27, the second guide roller 32 and the first guide roller 31 in sequence along the dotted line trajectory shown in the figure. At this time, the first pressure plate 311 and the second pressure plate 331 are respectively in the initial position. Then, combine Figure 5 and Figure 6 By activating the lifting drive component 29, the lifting seat 28 moves upward until the limiting groove 241 on the transmission block 24 engages with the limiting block 211. Then, as... Figure 9 As shown, the second pressing drive 332 drives the second pressing plate 331 to move downward, pressing the packaging bag film against and limiting it on the third guide roller 33. Simultaneously, the packaging bag film is pulled along the direction of the dotted arrow at its traction end, while the rotation drive 21 is activated, causing the sector gear 22 to mesh with the driven gear 23, causing the transmission block 24 to drive the limiting block 211 to rotate clockwise. Figure 10 As shown, the swing arm 26 drives the pressure bar 27 to swing upward, so as to pull the amount of packaging bag film pre-unwound between the first guide roller 31 and the third guide roller 33, realizing the unwinding and pulling of the packaging bag film in steps. The pressure bar 27 is mechanically driven to reduce the pulling resistance of the packaging bag film. During the upward swing of the pressure bar 27, the rotation axis of the winding roller 12 is the axis of the limiting rod 210. Next, as the sector gear 22 continues to rotate, it disengages from the driven gear 23. Simultaneously, the processing end of the packaging film begins processing the packaging bag, meaning the traction end of the packaging film stops traction. Figure 11As shown, the packaging film on the first guide roller 31 is abutted and limited by the first pressure plate 311, while the second pressure plate 331 moves up to the initial position. At this time, under the eccentric action of the film roll body 1, the roller 12 drives the drum 11 to swing counterclockwise. Under the action of inertial force, the drum 11 rotates counterclockwise relative to the roller 12, so as to promote the unwinding of the packaging film. The pressure rod 27 also swings down under the action of gravity, further increasing the counterclockwise swing intensity of the roller 12 and the downward swing of the pressure rod 27 to pull the packaging film. Combined with the aforementioned inertial unwinding of the drum 11, compared with the traditional film roll being rigidly pulled over a long distance when stationary, the unwinding resistance of the packaging film is significantly reduced. The lower pressure bar 27 swings down to Figure 9 At the indicated position, complete the rewinding of the packaging bag film, and repeat. Figure 10 and Figure 11 The illustrated working process allows for the separate unwinding and traction of the packaging film.
[0037] The embodiments described above are merely examples of several implementations of the present invention, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the present invention. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of the present invention, and these modifications and improvements all fall within the scope of protection of the present invention.
Claims
1. A packaging bag film roll unwinding device, characterized in that, include: The feeding mechanism (2) includes a support (25), a pressing drive assembly and a pressing rod (27). The support (25) is used to support the film roll body (1), and the output end of the pressing drive assembly is connected to the pressing rod (27). The guiding mechanism (3) includes a mounting frame (34), a first guide roller (31), a first pressure plate (311), a first pressing drive (312), a third guide roller (33), a second pressure plate (331), and a second pressing drive (332). The first guide roller (31) and the third guide roller (33) are respectively mounted on the mounting frame (34), and the first guide roller (31) and the third guide roller (33) are respectively located above the pressing rod (27). The output end of the first pressing drive (312) is connected to the first pressure plate (311), and the output end of the second pressing drive (332) is connected to the second pressure plate (331). The unwinding end of the packaging bag film on the film roll body (1) passes around the third guide roller (33), the pressing rod (27), and the first guide roller (31) in sequence, and the packaging bag film rubs against the third guide roller (33), the pressing rod (27), and the first guide roller (31) respectively. When the pressure bar (27) swings down, the first pressure plate (311) moves to frictional contact with the packaging film on the first guide roller (31), and the second pressure plate (331) is in the initial position; when the pressure bar (27) swings up under the drive of the pressure drive assembly, the first pressure plate (311) moves to the initial position, and the second pressure plate (331) moves to frictional contact with the packaging film on the third guide roller (33).
2. The packaging bag film roll unwinding device according to claim 1, characterized in that, The guiding mechanism (3) also includes a second guide roller (32), which is located between the first guide roller (31) and the pressure bar (27). The unwinding end of the packaging bag film on the film roll body (1) passes around the third guide roller (33), the pressure bar (27), the second guide roller (32) and the first guide roller (31) in sequence.
3. The packaging bag film roll unwinding device according to claim 1, characterized in that, The pressing drive assembly includes a rotating drive (21), a sector gear (22), a driven gear (23), a transmission block (24), and a swing arm (26). The output end of the rotating drive (21) is connected to the sector gear (22), which meshes with the driven gear (23). The driven gear (23) is fixedly connected to the transmission block (24), and the transmission block (24) is fixedly connected to the swing arm (26). The end of the swing arm (26) away from the transmission block (24) is rotatably connected to the pressing rod (27). During the upward swing of the pressing rod (27), the sector gear (22) and the driven gear (23) mesh and drive each other. During the downward swing of the pressing rod (27), the sector gear (22) and the driven gear (23) disengage.
4. The packaging bag film roll unwinding device according to claim 3, characterized in that, Along the upward swing direction of the pressure rod (27), the swing arm (26) is inclined, and a counterweight (242) is provided on the rear side of the transmission block (24). When the pressure rod (27) is in the initial position, the transmission block (24) is located at the lowest position of the swing trajectory.
5. The packaging bag film roll unwinding device according to claim 3, characterized in that, The film roll body (1) includes a roll (11) and a roller (12). The roll (11) is rotatably sleeved on the roller (12). The roll (11) has a packaging film to be unwound wound on it. Eccentric rods (212) are fixedly provided at both ends of the roller (12). The support (25) has a support groove (251). When the film roll body (1) is in the feeding position, the eccentric rod (212) is supported on the support (25) through the support groove (251).
6. The packaging bag film roll unwinding device according to claim 5, characterized in that, The axis of the eccentric rod (212) is eccentrically set with respect to the axis of the roller (12). The end of the eccentric rod (212) away from the roller (12) is fixedly connected to a limiting rod (210). The side end of the limiting rod (210) is fixedly connected to a limiting block (211). A limiting groove (241) is provided on the transmission block (24). The limiting block (211) is engaged with the transmission block (24) through the limiting groove (241).
7. The packaging bag film roll unwinding device according to claim 6, characterized in that, The rotation drive (21) is installed on the lifting seat (28), and the lower end of the lifting seat (28) is fixedly connected to the output end of the lifting drive (29).
8. The packaging bag film roll unwinding device according to claim 5, characterized in that, It also includes a feeding mechanism (4), which is used to move the film roll body (1) from the initial position to the feeding position.
9. A packaging bag film roll unwinding device according to claim 8, characterized in that, The feeding mechanism (4) includes a second shifting drive (41), a swing frame (42), a sliding frame (43), a third shifting drive (44), and a gripper (45). The second shifting drive (41) is rotatably mounted on the mounting frame (34), and the output end of the second shifting drive (41) is rotatably connected to the swing frame (42). The upper end of the swing frame (42) is rotatably mounted on the mounting frame (34), and the lower end of the swing arm (26) is slidably mounted on the sliding frame (43). A third shifting drive (44) is installed on one side of the swing frame (42). The output end of the third shifting drive (44) is fixedly connected to a sliding frame (43). A gripper (45) is provided at the end of the sliding frame (43) away from the swing frame (42). The two ends of the roller (12) are respectively provided with clamping grooves (13). The gripper (45) is correspondingly provided with the clamping grooves (13). The gripper (45) is used to clamp and fix the roller (12) through the clamping grooves (13).
10. A packaging bag film roll unwinding device according to claim 9, characterized in that, The mounting frame (34) has a base (101) on one side. When the film roll body (1) is in the initial position, the eccentric rod (212) is mounted on the base (101), and the axial end face of the roller (12) is limited and abutted against the side end face of the base (101).