Pre-opening device of continuous rolling spot-breaking bag making machine

Abstract

The utility model discloses a pre-opening device of a continuous rolling spot-breaking bag making machine, which comprises an asynchronous roller group, and the asynchronous roller group comprises a fixed roller and a movable roller which are matched with a pre-opening bag opening; a fixed roller connected with the first rotary driving unit is rotationally arranged on the rack, and the peripheral surface of the fixed roller is provided with a working line extending axially; the movable roller is in transmission connection with an independent power source, and the independent power source drives the movable roller to be away from or close to contact with the fixed roller in the vertical direction; the movable roller is further in transmission connection with a second rotation driving unit driving the movable roller to rotate. A friction working surface is arranged between the fixed roller and the movable roller; when the fixed roller makes contact with the movable roller, the working line of the fixed roller coincides with the friction working face, the movable roller is in a static state, and the working line laterally deviates from the friction working face along with rotation of the fixed roller to achieve friction pre-opening of materials in a matched mode. And when the fixed roller is separated from the movable roller, the second rotary driving unit drives the movable roller to rotate around the axis. The movable roller supports materials, the fixed roller rotates to rub and pre-open one side of the materials, an independent power source is convenient to adjust, the second rotary driving unit drives the movable roller to rotate in the process that the movable roller is far away, and the service life is prolonged.

Description

Technical Field

[0001] This utility model relates to the field of bag making machines, and in particular to a pre-opening device for a continuous roll-to-break bag making machine. Background Technology

[0002] Point-break roll bags are a type of packaged bag connected by point-break indentations, typically made of plastic (such as PE or PP) or biodegradable materials. Their core feature is the use of "point-break lines" to separate adjacent bags; individual bags can be quickly separated by gently tearing along the indentations while maintaining the continuity of the entire roll. Thanks to this design, point-break roll bags are widely used in retail, food, industrial parts, and logistics.

[0003] However, the existing design has significant flaws: due to electrostatic adsorption or residual stickiness from the heat-sealing process on both sides of the bag's inner walls, consumers need to repeatedly rub the bag opening to separate the inner walls upon first use, and may even need to apply liquid (such as water or saliva) to increase friction to open it. This problem severely reduces operational efficiency, poses hygiene risks, and results in a poor user experience. Summary of the Invention

[0004] This utility model addresses the shortcomings of existing technologies by providing a pre-opening device for a continuous roll-to-break bag making machine that facilitates bag opening and improves user experience.

[0005] To solve the above-mentioned technical problems, this utility model provides the following technical solution: a pre-opening device for a continuous roll-to-break bag making machine, comprising an asynchronous roller group, the asynchronous roller group including a fixed roller and a movable roller for pre-opening the bag opening; the fixed roller is rotatably mounted on the frame, the fixed roller is driven by a first rotary drive unit, and the outer circumferential surface of the fixed roller has an axially extending working line; the movable roller is driven by an independent power source, the independent power source drives the movable roller to move away from or closer to the fixed roller in a vertical direction; the movable roller is also driven by a second rotary drive unit that drives its rotation; there is a friction working surface between the fixed roller and the movable roller; when the fixed roller contacts the movable roller, the working line of the fixed roller coincides with the friction working surface, the movable roller is stationary, and the working line shifts laterally from the friction working surface as the fixed roller rotates, thus achieving frictional pre-opening of the material; when the fixed roller and the movable roller separate, the second rotary drive unit drives the movable roller to rotate around its axis.

[0006] The movable roller of this invention supports the material, and the first rotary drive unit drives the fixed roller to rotate, pre-opening one side of the material through friction, making it easier for the user to open the bag later. After the pre-opening action is completed, an independent power source drives the movable roller away from the fixed roller, facilitating the entry of the next material to be pre-opened through friction. During this movement, the second rotary drive unit drives the movable roller to rotate partially, achieving uniform friction on the movable roller and extending its service life.

[0007] Preferably, the fixed roller and the movable roller are arranged vertically opposite each other, and their axes are parallel. This ensures uniform pressure distribution between the rollers, avoids excessive local friction or uneven wear caused by axial misalignment, and further guarantees the service life of the fixed roller and the movable roller.

[0008] Furthermore, the movable roller is rotatably mounted between the lifting rods, which are slidably connected to the frame via guide rails and move vertically. The guide rails guide and enhance the stability of the movable roller's lifting and lowering, preventing swaying.

[0009] Furthermore, the independent power source is a servo motor, the output end of which is connected to a drive shaft. At least two eccentric wheels are fixedly mounted on the drive shaft, and each eccentric wheel is hinged to its respective lifting rod via a drive rod. The servo motor precisely controls the lifting stroke and pressure to adapt to the pre-opening requirements of materials of different thicknesses.

[0010] Based on the lifting rod, the independent power source is either a cylinder or a linear motor, and the output end of the independent power source is connected to the lifting rod. Cylinders offer fast response times, making them suitable for high-speed production lines. Furthermore, cylinder drives simplify the transmission chain, reduce failure rates, and lower maintenance costs.

[0011] Preferably, the second rotary drive unit includes a chain, a sprocket, and a one-way bearing. The sprocket is mounted on one end of the movable roller via 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 rotates passively when moving downwards and remains stationary when moving upwards, ensuring stable friction pre-opening of the bag opening.

[0012] Preferably, the first rotary drive unit drives the fixed roller to rotate circumferentially around the axis.

[0013] Preferably, the first rotary drive unit drives the fixed shaft to swing left and right around the axis. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the structure of this utility model.

[0015] Figure 2 This is a three-dimensional structural view of the present invention.

[0016] Figure 3 This is a perspective view of the asynchronous roller assembly of this utility model.

[0017] Figure 4 This is the front view of the asynchronous roller assembly of this utility model.

[0018] The names of the body parts referred to by the numbers in the above attached diagrams are as follows:

[0019] Among them, 1. Asynchronous roller group; 2. Fixed roller; 3. First rotary drive unit; 4. Movable roller; 5. Independent power source; 6. Second rotary drive unit; 61. Chain; 62. Sprocket; 63. One-way bearing; 7. Lifting rod; 8. Guide rail; 91. Drive shaft; 92. Eccentric wheel; 93. Drive rod; 10. Conveying device. Detailed Implementation

[0020] The present invention will now be described in further detail with reference to the accompanying drawings and embodiments.

[0021] A pre-opening device for a continuous roll-to-break bag-making machine includes an asynchronous roller group 1. The asynchronous roller group 1 includes a fixed roller 2 and a movable roller 4 that cooperate in pre-opening the bag opening. The fixed roller 2 and the movable roller 4 are arranged vertically opposite each other, and their axes are parallel. The balanced arrangement of the two rollers ensures uniform pressure distribution between the rollers, guaranteeing the service life of the fixed roller 2 and the movable roller 4. The fixed roller 2 is rotatably mounted on the frame and is connected to a first rotary drive unit 3, which can be a belt drive mechanism or a gear drive mechanism, etc. The first rotary drive unit 3 drives the fixed roller 2 to rotate circumferentially around its axis. The first rotary drive unit 3 can drive the fixed roller 2 to rotate intermittently and continuously in the same direction, or it can drive a fixed shaft to swing left and right around its axis, causing the fixed roller 2 to swing left or right sequentially. Preferably, the fixed roller 2 rotates intermittently around its axis, resulting in a relatively long service life and reduced energy consumption. The outer circumferential surface of the fixed roller 2 has an axially extending working line; in this embodiment, the working line is the line formed when the fixed roller 2 contacts the movable roller 4. The movable roller 4 is connected to an independent power source 5. The independent power source 5 drives the movable roller 4 to move vertically away from or towards the fixed roller 2. Two sets of lifting rods 7 are provided, allowing for easy adjustment of the independent power source according to material specifications. The movable roller 4 is rotatably positioned between the lifting rods 7. A guide rail 8 is fixedly mounted vertically on the frame. The lifting rods 7 are slidably connected to the frame via the guide rail 8 and move vertically. The guide rail guides and improves the stability of the movable roller 4's lifting. The independent power source 5 is a servo motor, a rotary type. The output end of the servo motor is connected to a drive shaft 91, on which at least two eccentric wheels 92 are fixedly mounted. Each eccentric wheel 92 is hinged to its respective lifting rod 7 via a drive rod 93. The servo motor precisely controls the stroke and pressure of the movable roller 4, adapting to the pre-opening requirements of materials of different thicknesses and facilitating adjustment. Alternatively, the independent power source 5 can be a cylinder or a linear motor. The output end of each independent power source 5 is connected to its respective lifting rod 7. The independent power source 5 and lifting rod 7 are modularly configured for easy maintenance. The movable roller 4 is also connected to the second rotary drive unit 6 that drives it to rotate. The second rotary drive unit 6 drives the movable roller 4 to rotate periodically, so as to avoid uneven wear caused by long-term local contact of the roller body with the material.

[0022] The fixed roller 2 and the movable roller 4 have a friction working surface. Material is conveyed on this surface. When the fixed roller 2 contacts the movable roller 4, the working line of the fixed roller 2 coincides with the friction working surface, while the movable roller 4 remains stationary. The movable roller 4 supports the material, ensuring the integrity of the contact surface between the material and the movable roller 4. Furthermore, the stationary position of the movable roller 4 ensures full contact between the bag opening and the roller surface. The first rotary drive unit 3 drives the fixed roller 2 to rotate in the same direction or oscillate left and right sequentially, causing the working line to shift laterally from the friction working surface as the fixed roller 2 rotates. The rotation of the fixed roller 2 helps to pre-open the material through friction. When the fixed roller 2 separates from the movable roller 4, the second rotary drive unit 6 drives the movable roller 4 to rotate around its axis.

[0023] To achieve rotation of the movable roller 4 during descent, the second rotary drive unit 6 could be a rotary motor. However, to reduce costs, the second rotary drive unit 6 includes a chain 61, a sprocket 62, and a one-way bearing 63. The sprocket 62 is mounted on one end of the movable roller 4 via the one-way bearing 63, and is fixedly connected to the outer circumference of the one-way bearing 63. The one-way bearing 63 is mounted on the shaft end of the movable roller 4, and the movable roller 4 is mounted on the lifting rod via the one-way bearing 63. The chain 61 is vertically mounted on the frame and fixed to the frame with screws. The sprocket 62 meshes with the chain 61. When the movable roller 4 is driven downward by the independent power source 5, the sprocket 62 meshes with the chain 61, causing the sprocket 62 to rotate passively. The one-way bearing 63 drives the movable roller 4 to rotate in one direction. During upward movement, the sprocket 62 idles, and the movable roller 4 remains stationary.

[0024] The working principle of this utility model is described below with reference to the accompanying drawings: The conveying device 10 on the frame intermittently conveys the continuously rolled material. When the bag opening of the material enters between the fixed roller 2 and the movable roller 4, the material stops moving. The independent power source 5 drives the lifting rod 7 to move the movable roller 4 upward. During the upward movement, the sprocket 62 idles, and the movable roller 4 remains stationary until the movable roller 4 presses against the fixed roller 2. At this time, the working line of the fixed roller 2 coincides with the friction working surface where the material is located. The first rotation drive unit 3 drives the fixed roller 2 to rotate relative to the movable roller 4, and the working line shifts to the side. The fixed roller 2 and the movable roller 4 cooperate to pre-open the material.

[0025] Subsequently, the independent power source 5 drives the movable roller 4 to move downwards along the guide rail 8. The chain 61 meshes with the sprocket 62, and the one-way bearing 63 drives the movable roller 4 to rotate, preventing long-term wear in the same area of ​​the movable roller 4. During the downward movement of the movable roller, the conveying device 10 continues to convey the continuously rolled material until the lowered bag opening position is reached, and the above actions are repeated.

[0026] 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.

[0027] 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 pre-opening device for a continuous roll-to-break bag making machine, characterized in that: It includes an asynchronous roller group (1), which includes a fixed roller (2) and a movable roller (4) that are designed to cooperate with the pre-opening of the bag opening. A fixed roller (2) is rotatably mounted on the frame. The fixed roller (2) is connected to the first rotary drive unit (3) for transmission. The outer circumferential surface of the fixed roller (2) has an axially extending working line. The movable roller (4) is connected to an independent power source (5) for transmission. The independent power source (5) drives the movable roller (4) to move away from or closer to the fixed roller (2) in the vertical direction. The movable roller (4) is also connected to the second rotary drive unit (6) that drives its rotation; There is a friction working surface between the fixed roller (2) and the movable roller (4); When the fixed roller (2) contacts the movable roller (4), the working line of the fixed roller (2) coincides with the friction working surface, the movable roller (4) is stationary, and the working line shifts from the friction working surface to the side as the fixed roller (2) rotates, thus achieving friction pre-opening of the material. When the fixed roller (2) separates from the movable roller (4), the second rotation drive unit (6) drives the movable roller (4) to rotate around its axis.

2. The pre-opening device of the continuous roll-to-break bag making machine according to claim 1, characterized in that: The fixed roller (2) and the movable roller (4) are arranged opposite each other vertically, and their axes are parallel.

3. The pre-opening device of the continuous roll-to-break bag making machine according to claim 2, characterized in that: The movable roller (4) is rotatably arranged between the lifting rods (7), and the lifting rods (7) are slidably connected to the frame through the guide rail (8) and move in the vertical direction.

4. The pre-opening device of the continuous roll-to-break bag making machine according to claim 3, characterized in that: The independent power source (5) is a servo motor. The output end of the servo motor is connected to a transmission shaft (91). At least two eccentric wheels (92) are fixedly installed on the transmission shaft (91). Each eccentric wheel (92) is hinged to its respective lifting rod (7) through a drive rod (93).

5. The pre-opening device of the continuous roll-to-break bag making machine according to claim 3, characterized in that: The independent power source (5) is a cylinder or a linear motor, and the output end of each independent power source (5) is connected to its respective lifting rod (7).

6. The pre-opening device of the continuous roll-to-break bag making machine according to claim 1, characterized in that: The second rotary drive unit (6) includes a chain (61), a sprocket (62) and a one-way bearing (63). The sprocket (62) is mounted on one end of the movable roller (4) via the one-way bearing (63). The chain (61) is mounted vertically on the frame. The sprocket (62) meshes with the chain (61).

7. The pre-opening device of the continuous roll-to-break bag making machine according to claim 1, characterized in that: The first rotary drive unit (3) drives the fixed roller (2) to rotate circumferentially around the axis.

8. The pre-opening device of the continuous roll-to-break bag making machine according to claim 1, characterized in that: The first rotary drive unit (3) drives the fixed shaft to swing left and right around the axis.

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