Material fracture prevention device of spot-breaking continuous-rolling bag making machine

Abstract

The material breakage prevention device of the point breakage continuous rolling bag making machine comprises a floating material storage mechanism, the floating material storage mechanism comprises a floating roller capable of floating up and down, and a friction pre-opening mechanism and a buffering traction mechanism are sequentially arranged in front of the floating material storage mechanism; the friction pre-opening mechanism comprises a first traction roller set, a second traction roller set and a bag twisting roller set. The first traction roller set and the second traction roller set are matched to form a tension control area, and the bag twisting roller set is arranged in the tension control area. The bag rubbing roller set comprises an upper bag rubbing roller and a lower bag rubbing roller, the lower bag rubbing roller is in transmission connection with an independent power source driving the lower bag rubbing roller to move up and down, and linear speed difference exists when the upper bag rubbing roller makes contact with the lower bag rubbing roller. The buffering traction mechanism comprises a third roller set, the third roller set comprises a third upper roller, a third lower roller and a buffering power source, the third lower roller is in transmission connection with the buffering power source, and the third roller set can adjust the floating amplitude of the floating roller. The tension control area enables the tension of the roll material between the traction rollers to be uniform, the speed difference between the bag twisting upper roller and the bag twisting lower roller can stably pre-open the bag opening part of the roll material under the stable tension, and the bag twisting success rate is guaranteed.

Description

Technical Field

[0001] This utility model relates to the field of bag making machine winding, and in particular to a device for preventing material breakage in a point-break continuous winding bag making machine. Background Technology

[0002] With its unique structure connected by point-break lines, the continuous roll bag has become a preferred solution in the daily necessities packaging industry due to its advantages such as small footprint, convenient storage, and flexible access. However, this product has significant technical drawbacks in actual use: due to the electrostatic adsorption effect generated during the bag-making process, users often find it difficult to directly peel off the bag opening, requiring the primitive operation of increasing friction by applying water or saliva. This method not only poses hygiene risks but also seriously affects ease of use and consumer experience. To address this common industry problem, the applicant has filed a utility model patent application on the same day for "A pre-opening device for a continuous roll point-break bag-making machine," which achieves pre-separation of the bag opening by adding a friction pretreatment mechanism, solving the problem of difficult opening at the end of the production process.

[0003] However, in practical applications, a new technical bottleneck has been discovered in existing pretreatment schemes: to achieve effective friction treatment, material conveying must adopt an intermittent operation mode. This variable speed motion mechanism leads to a significant increase in the amplitude of the key component of the equipment—the floating roller. Especially when processing large-sized materials, the instantaneous stagnation of material conveying can cause the floating roller to drop sharply. Due to the limited tensile strength of the point-break line connection structure, the violent displacement of the floating roller can easily cause the material to break unexpectedly along the point-break line, leading to equipment jamming, shutdown, and other operational failures. In severe cases, abnormal movement of mechanical parts may even pose a safety risk to personnel. Summary of the Invention

[0004] This invention addresses the shortcomings of existing technologies by providing a material breakage prevention device for point-break continuous roll bag making machines, which prevents material from unexpectedly breaking along the point breakage line due to excessive amplitude of the floating roller.

[0005] To solve the above-mentioned technical problems, this utility model provides the following technical solution: A material breakage prevention device for a point-break continuous roll bag making machine, comprising a floating storage mechanism, wherein the floating storage mechanism includes a floating roller that can float up and down, characterized in that: a friction pre-opening mechanism and a buffer traction mechanism are sequentially arranged in front of the floating storage mechanism; the friction pre-opening mechanism includes a first traction roller group, a second traction roller group, and a bag-rubbing roller group; the first traction roller group and the second traction roller group cooperate to form a tension control zone, and the bag-rubbing roller group is disposed within the tension control zone; the bag-rubbing roller group includes an upper bag-rubbing roller and a lower bag-rubbing roller, the lower bag-rubbing roller being driven by an independent power source that drives its up and down movement, and the upper bag-rubbing roller and the lower bag-rubbing roller having a linear velocity difference when in contact; the buffer traction mechanism includes a third roller group, the third roller group including a third upper roller, a third lower roller, and a buffer power source, the third lower roller being driven by the buffer power source, and the third roller group being able to adjust the floating amplitude of the floating roller.

[0006] This invention creates a tension control zone between the first and second traction roller groups, ensuring uniform tension of the rolled material between the rollers. Under stable tension, the speed difference between the upper and lower bag-forming rollers is maintained to pre-open the bag opening, guaranteeing a high success rate for bag forming. An independent power source allows for easy adjustment of the lower bag-forming roller to accommodate materials of varying thicknesses. A buffer traction mechanism regulates fluctuations in the roll conveying speed of the third roller group, suppressing sudden changes in the amplitude of the floating roller and preventing excessive amplitude, thus ensuring normal equipment operation.

[0007] Preferably, the upper bag-rubbing roller is connected to a power source that drives its rotation, and the lower bag-rubbing roller is connected to an adjustment drive assembly that drives its unidirectional rotation. When the lower bag-rubbing roller contacts the upper bag-rubbing roller, the power source drives the upper bag-rubbing roller to rotate, while the lower bag-rubbing roller remains stationary. The difference in linear velocity between the upper and lower bag-rubbing rollers pre-opens the bag opening. The stationary lower bag-rubbing roller and the rotating upper bag-rubbing roller create unilateral friction, ensuring controllable bag opening separation force and preventing damage to the outer surface of the material due to excessive friction.

[0008] Based on the existing bag-rubbing lower roller, the bag-rubbing lower roller is rotatably mounted between lifting rods. The lifting rods are slidably connected to the frame via guide rails, and an independent power source drives the lifting rods to move vertically. The lifting rods move stably along the guide rails to prevent them from deviating.

[0009] Based on having an independent power source, the independent power source is either a cylinder or a linear motor, and each independent power source is connected to its respective lifting rod.

[0010] Based on having an independent power source, the independent power source is a rotary servo motor. The output end of the independent power source is connected to a transmission shaft. At least two eccentric wheels are fixedly installed on the transmission shaft. Each eccentric wheel is hinged to its respective lifting rod through a drive rod.

[0011] Based on the adjustable drive assembly, the adjustable drive assembly includes a chain, a sprocket, and a one-way bearing. The one-way bearing is mounted on the shaft end of the bag-rubbing roller, the sprocket is fixedly connected to the outer periphery of the one-way bearing, and the chain is vertically mounted on the frame. The sprocket meshes with the chain. While reducing costs, the one-way sprocket ensures that the movable roller only passively rotates when moving downwards and remains stationary when moving upwards, ensuring stable friction pre-opening of the bag opening.

[0012] Preferably, a flexible tension curtain is provided between the second and third traction roller groups. The upper end of the flexible tension curtain is fixedly mounted on the frame, and the lower end forms a free hanging section. The free hanging section of the flexible tension curtain buffers and balances the tension of the material through its own weight, reducing vibration caused by sudden changes in material speed.

[0013] Preferably, the first traction roller group includes a first upper roller and a first lower roller, and the second traction roller group includes a second upper roller and a second lower roller. The first upper roller and the second upper roller are respectively adjusted vertically on the frame, and the first lower roller and the second lower roller are connected to a rotating power source via a synchronous belt. The synchronous belt ensures that the first traction roller group and the second traction roller group are driven synchronously, forming a tension control zone, avoiding stretching or wrinkling of the material due to speed differences, keeping the material flat, and ensuring the quality of bag forming.

[0014] Preferably, the floating roller is rotatably mounted at one end of the swing frame, and the other end of the swing frame is hinged to the machine frame. The swing frame utilizes the material's own weight to dynamically balance the tension. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the structure of this utility model.

[0016] Figure 2 This is a perspective view of the present invention.

[0017] Figure 3 This is a schematic diagram of the friction pre-opening mechanism of this utility model.

[0018] Figure 4 This is a schematic diagram of the structure of the bag-rubbing roller assembly of this utility model.

[0019] The names of the body parts referred to by the numbers in the above attached diagrams are as follows:

[0020] The components include: 1. Frame; 2. Friction pre-opening mechanism; 21. First traction roller group; 211. First upper roller; 212. First lower roller; 22. Second traction roller group; 221. Second upper roller; 222. Second lower roller; 23. Bag-rubbing roller group; 231. Bag-rubbing upper roller; 232. Bag-rubbing lower roller; 233. Bag-rubbing power source; 3. Third traction roller group; 31. Third upper roller; 32. Third lower roller; 33. Buffer power source; 4. Floating storage mechanism; 41. Floating roller; 42. Swing frame; 5. Adjustment drive assembly; 51. Chain; 52. Sprocket; 53. One-way bearing; 6. Lifting rod; 7. Guide rail; 8. Independent power source; 9. Drive shaft; 10. Eccentric wheel; 11. Flexible tension curtain; 111. Free suspension part. Detailed Implementation

[0021] The present invention will now be described in further detail with reference to the accompanying drawings and embodiments. Figure 1 The arrow indicates the direction of material movement.

[0022] like Figure 1As shown, the anti-material breakage device of the point-break continuous roll bag making machine includes a floating storage mechanism 4. The floating storage mechanism 4 includes a floating roller 41 that can float up and down. The floating roller 41 is rotatably mounted at one end of a swing frame 42, and the other end of the swing frame 42 is hinged to the frame 1. A friction pre-opening mechanism 2 and a buffer traction mechanism are sequentially arranged in front of the floating storage mechanism 4. That is, the frame 1 is arranged in sequence along the material travel direction with the friction pre-opening mechanism 2, the buffer traction mechanism, and the floating storage mechanism 4. The friction pre-opening mechanism 2 includes a first traction roller group 21, a second traction roller group 22, and a bag-rubbing roller group 23. The first traction roller group 21 includes a first upper roller 211 and a second lower roller 212, which cooperate to clamp and convey materials. The second traction roller group 22 includes a second upper roller 221 and a second lower roller 222, which cooperate to clamp and convey materials. The first upper roller 211 and the second upper roller 221 are respectively adjusted up and down on the frame 1. The shaft end of the first upper roller 211 is mounted on the first adjusting slider through a bearing. The first adjusting slider is slidably mounted on the first slider adjusting plate of the frame 1. The first slider adjusting plate is fixedly mounted on the frame 1. The second upper roller 221 is mounted on the second slider adjustment plate via a second adjusting slider. The second slider adjustment plate is fixedly mounted on the frame 1. The first lower roller 212 and the second lower roller 222 are connected to a rotating power source via a synchronous belt. Specifically, the first lower roller 212 has a first synchronous pulley at its shaft end, and the second lower roller 222 has a second synchronous pulley at its shaft end. The first and second synchronous pulleys are located on the same side. The first and second synchronous pulleys are connected to the output end of the rotating power source via a synchronous belt. The first lower roller 212 and the second lower roller 222 can also have separate power sources, but it is preferred that the first lower roller 212 and the second lower roller 222 are connected by a synchronous belt to avoid stretching or wrinkling of the material due to speed differences, keep the material flat, and ensure the quality of bag making. The first traction roller group 21 and the second traction roller group 22 cooperate to form a tension control zone. The bag making roller group 23 is set in the tension control zone. The bag making roller group 23 makes bags for materials with stable tension, ensuring the success rate of bag making. The bag-rubbing roller assembly 23 includes an upper bag-rubbing roller 231 and a lower bag-rubbing roller 232. The lower bag-rubbing roller 232 is connected to an independent power source 8 that drives it to move up and down. The independent power source 8 drives the lower bag-rubbing roller 232 to move up and down relative to the upper bag-rubbing roller 231 to get closer to or away from the upper bag-rubbing roller 231. The independent power source 8 facilitates the up and down adjustment of the lower bag-rubbing roller 232 to adapt to materials of different thicknesses.

[0023] When the upper bag-rubbing roller 231 and the lower bag-rubbing roller 232 come into contact, there is a difference in linear velocity. Specifically, the upper bag-rubbing roller 231 is connected to a power source 233 that drives its rotation, which is a servo motor. The lower bag-rubbing roller 232 is connected to an adjustment drive assembly 5 that drives its unidirectional rotation. When the lower bag-rubbing roller 232 comes into contact with the upper bag-rubbing roller 231, the lower bag-rubbing roller 232 remains stationary, and the power source 233 drives the upper bag-rubbing roller 231 to rotate. The difference in linear velocity between the upper bag-rubbing roller 231 and the lower bag-rubbing roller 232 helps to pre-open the opening of the material bag. The lower bag-rubbing roller 232 is rotatably mounted between lifting rods 6. The lifting rods 6 are slidably connected to the frame 1 via guide rails 7. The guide rails 7 are fixedly mounted on the wall plate of the frame 1 in the vertical direction. The independent power source 8 drives the lifting rods 6 to move in the vertical direction. There can be multiple independent power sources 8, such as cylinders or linear motors. Each independent power source 8 is connected to its respective lifting rod 6, forming a module with the lifting rod 6 for easy maintenance. Alternatively, there can be a single independent power source 8, such as a rotary servo motor. The output end of the rotary servo motor is connected to a drive shaft 9, on which at least two eccentric wheels 10 are fixedly mounted. Each eccentric wheel 10 is hinged to its respective lifting rod 6 via a drive rod, and the rotation of the eccentric wheels 10 drives the bag-rubbing roller 232 on the lifting rod 6 to move up and down.

[0024] The buffer traction mechanism includes a third roller group, which comprises a third upper roller 31, a third lower roller 32, and a buffer power source 33. The third lower roller 32 is connected to the buffer power source 33. The floating amplitude of the floating roller 41 can be adjusted by the third roller group. The third upper roller 31 is adjustable up and down and is mounted on the frame 1. The third lower roller 32 cooperates with the third upper roller 31 to clamp and convey materials. In this embodiment, the buffer power source 33 is a motor, which is connected to the third lower roller 32 by a transmission belt. The buffer power source 33 adjusts the conveying speed of the third roller group, thereby controlling the up and down floating amplitude of the floating roller, avoiding the unexpected breakage of materials along the break line caused by the violent displacement of the floating roller, and ensuring the normal operation of the equipment.

[0025] To prevent material accumulation and large material tension fluctuations caused by the speed difference between the second traction roller group 22 and the third roller group, a flexible tension curtain 11 is provided between the second traction roller group 22 and the third roller group. The upper end of the flexible tension curtain 11 is fixedly mounted on the frame 1, and the lower end forms a free hanging part 111. The upper end of the flexible tension curtain 11 is hung on the crossbeam of the frame 1, and the lower free hanging part 111 keeps the material tension stable by its own weight. In addition, the flexible tension curtain 11 can absorb some tension fluctuations, reduce the instantaneous impact force of the material, and ensure smooth conveying.

[0026] To enable the bag-rubbing roller 232 to rotate in one direction, the adjustment drive assembly 5 includes a chain 51, a sprocket 52, and a one-way bearing 53. The one-way bearing 53 is mounted on the shaft end of the bag-rubbing roller 232, and the bag-rubbing roller 232 is mounted between the lifting rods 6 via the one-way bearing 53. The sprocket 52 is fixedly connected to the outer circumference of the one-way bearing 53. The chain 51 is vertically mounted on the frame 1 and fixed to the frame 1 by screws. The sprocket 52 meshes with the chain 51. The one-way bearing 53, sprocket 52, and chain 51 form a one-way transmission cooperation, ensuring that the bag-rubbing roller 232 remains stationary during the upward movement and rotates during the downward movement, thus avoiding localized wear of the bag-rubbing roller 232 and affecting its service life and bag-rubbing quality.

[0027] The working principle of this utility model is described below with reference to the accompanying drawings: The first traction roller group 21 and the second traction roller group 22 on the frame 1 intermittently convey the continuously rolled material. When the bag opening of the material enters between the upper bag-rubbing roller 231 and the lower bag-rubbing roller 232, the material stops moving. The first traction roller group 21 and the second traction roller group 22 clamp the two ends of the conveyed material, forming a tension control zone to keep the material flat. The independent power source 8 drives the lifting rod 6 to move the lower bag-rubbing roller 232 upward. During the upward movement, the sprocket 52 rotates freely, and the lower bag-rubbing roller 232 remains stationary until the upper bag-rubbing roller 231 and the lower bag-rubbing roller 232 are pressed together. At this time, the bag-rubbing power source 233 drives the upper bag-rubbing roller 231 to rotate relative to the lower bag-rubbing roller. The upper bag-rubbing roller 231 and the lower bag-rubbing roller 232 cooperate to pre-open the material through friction. Subsequently, the independent power source 8 drives the bag-rubbing roller 232 to move down along the guide rail 7, the chain 51 meshes with the sprocket 52, and the one-way bearing 53 drives the movable roller to rotate, thus avoiding long-term wear of the same area of ​​the movable roller body.

[0028] During the downward movement of the movable wheel, the first traction roller group 21 and the second traction roller group 22 continue to convey the continuously rolled material. The material moves from a static state to having a linear velocity. The buffer power source 33 of the third roller group controls the speed of the material before it enters the floating roller 41, suppressing sudden changes in the amplitude of the floating roller 41. The floating roller 41 swings up and down on the frame 1 through the swing frame 42 to ensure stable material tension, so as to ensure that the material is tightly and evenly wound in the subsequent winding process.

[0029] In the description of this invention, it should be understood that the terms "center," "length," "width," "thickness," "upper," "lower," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicating orientation or positional relationships based on the orientation or positional relationships shown in the accompanying drawings, are only for the convenience of describing the invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the invention. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined with "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this invention, "a plurality of" means two or more, unless otherwise explicitly specified.

[0030] In summary, the above description is only a preferred embodiment of the present utility model. All equivalent changes and modifications made within the scope of the patent application of the present utility model shall fall within the scope of the patent of the present utility model.

Claims

1. A material breakage prevention device for a point-break continuous roll bag making machine, comprising a floating storage mechanism (4), wherein the floating storage mechanism (4) comprises a floating roller (41) that can float up and down, characterized in that: The floating storage mechanism (4) is provided with a friction pre-opening mechanism (2) and a buffer traction mechanism in front of it in sequence; The friction pre-opening mechanism (2) includes a first traction roller group (21), a second traction roller group (22), and a bag-rubbing roller group (23). The first traction roller group (21) and the second traction roller group (22) cooperate to form a tension control zone, and the bag-rubbing roller group (23) is arranged in the tension control zone; The bag-rubbing roller assembly (23) includes an upper bag-rubbing roller (231) and a lower bag-rubbing roller (232). The lower bag-rubbing roller (232) is connected to an independent power source (8) that drives it to move up and down. The upper bag-rubbing roller (231) and the lower bag-rubbing roller (232) have a linear velocity difference when they are in contact. The buffer traction mechanism includes a third roller group, which includes a third upper roller (31), a third lower roller (32) and a buffer power source (33). The third lower roller (32) is connected to the buffer power source (33) in a transmission manner. The third roller group can adjust the floating amplitude of the floating roller (41).

2. The anti-material breakage device for the point-break continuous roll bag making machine according to claim 1, characterized in that: The upper bag-rubbing roller (231) is connected to a power source (233) that drives its rotation, and the lower bag-rubbing roller (232) is connected to an adjustment drive assembly (5) that drives its unidirectional rotation. When the lower bag-rubbing roller (232) contacts the upper bag-rubbing roller (231), the lower bag-rubbing roller (232) remains stationary, and the bag-rubbing power source (233) drives the upper bag-rubbing roller (231) to rotate. The difference in linear velocity between the upper bag-rubbing roller (231) and the lower bag-rubbing roller (232) pre-opens the opening of the material bag.

3. The anti-material breakage device for the point-break continuous roll bag making machine according to claim 2, characterized in that: The bag-rubbing roller (232) is rotatably arranged between the lifting rods (6). The lifting rods (6) are slidably connected to the frame (1) through the guide rail (7). The independent power source (8) drives the lifting rods (6) to move in the vertical direction.

4. The anti-material breakage device for the point-break continuous roll bag making machine according to claim 3, characterized in that: The independent power source (8) is a cylinder or a linear motor, and the independent power source (8) is connected to its respective lifting rod (6).

5. The anti-material breakage device for the point-break continuous roll bag making machine according to claim 3, characterized in that: The independent power source (8) is a rotary servo motor. The output end of the independent power source is connected to a transmission shaft (9). Two eccentric wheels (10) are fixedly installed on the transmission shaft (9). Each eccentric wheel (10) is hinged to its respective lifting rod (6) through a drive rod.

6. The anti-material breakage device for the point-break continuous roll bag making machine according to claim 2, characterized in that: The adjustment drive assembly (5) includes a chain (51), a sprocket (52) and a one-way bearing (53). The one-way bearing (53) is disposed on the shaft end of the bag-rubbing roller (232). The sprocket (52) is fixedly connected to the outer periphery of the one-way bearing (53). The chain (51) is vertically disposed on the frame (1). The sprocket (52) meshes with the chain (51).

7. The anti-material breakage device for the point-break continuous roll bag making machine according to claim 1, characterized in that: A flexible tension curtain (11) is provided between the second traction roller group (22) and the third roller group. The upper end of the flexible tension curtain (11) is fixedly mounted on the frame (1), and the lower end forms a free hanging part (111).

8. The anti-material breakage device for the point-break continuous roll bag making machine according to claim 1, characterized in that: The first traction roller group (21) includes a first upper roller (211) and a first lower roller (212), and the second traction roller group (22) includes a second upper roller (221) and a second lower roller (222). The first upper roller (211) and the second upper roller (221) are respectively adjusted up and down on the frame (1), and the first lower roller (212) and the second lower roller (222) are connected to the rotating power source through a synchronous belt.

9. The anti-material breakage device for the point-break continuous roll bag making machine according to claim 1, characterized in that: The floating roller (41) is rotatably mounted at one end of the swing frame (42), and the other end of the swing frame (42) is hinged to the frame (1).

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