A vertical packaging machine unwinding and film feeding device

Abstract

This utility model provides a film unwinding and feeding device for a vertical packaging machine, relating to the technical field of vertical packaging machines. It includes a film feeding frame, an unwinding mechanism, a roll diameter detection mechanism, and a tension feeding mechanism. The unwinding mechanism is mounted on the film feeding frame. The roll diameter detection mechanism is mounted on the film feeding frame and located above the unwinding mechanism. The roll diameter detection mechanism can detect the diameter of the film roll on the unwinding mechanism in real time, and the unwinding mechanism can adjust the unwinding speed of the film roll according to the roll diameter. The tension feeding mechanism is mounted on the film feeding frame and is used to stabilize the tension of the bag film. This utility model not only detects the roll diameter in real time and adjusts the unwinding speed of the unwinding mechanism according to the roll diameter, thereby ensuring the continuity and stability of the bag film conveying, but also provides stable tension during the bag film conveying process, reducing bag film offset and misalignment, ensuring the subsequent sealing quality of the bag film, and improving packaging quality.

Description

Technical Field

[0001] This utility model relates to the field of vertical packaging machine technology, specifically to a film unwinding and feeding device for a vertical packaging machine. Background Technology

[0002] In the production application of vertical packaging machines, the unwinding and film feeding device is one of the core components ensuring packaging continuity and quality. Its main function is to stably and uniformly transport the rolled film to subsequent bag making and sealing processes. However, existing unwinding and film feeding devices for vertical packaging machines generally suffer from the following technical defects during actual operation:

[0003] 1. Uncontrolled unwinding speed due to changes in film diameter: As the unwinding process continues, the film diameter gradually decreases from its initial maximum diameter to its minimum diameter (i.e., the core diameter). Existing unwinding mechanisms often employ fixed rotation speeds or simple mechanical speed regulation structures, failing to detect the dynamic changes in film diameter in real time. This leads to a mismatch between the unwinding speed and the required speed of subsequent processes. When the film diameter is large, the film delivery volume at a fixed rotation speed is excessive, easily resulting in film accumulation and wrinkles. When the film diameter is small, the film delivery volume at a fixed rotation speed is insufficient, easily causing film stretching and breakage, severely impacting packaging efficiency and product qualification rate.

[0004] 2. Instability in film conveying due to lack of tension control: Film conveying requires extremely high tension stability. Excessive tension can cause stretching and deformation of the film (especially for thin or easily stretchable plastic or composite films), leading to dimensional deviations in the final packaged product. Insufficient tension can cause the film to loosen and shift, affecting the sealing of the subsequent sealing and potentially causing misalignment of the packaging pattern, thus reducing the product's appearance quality. Existing unwinding and feeding film devices often lack dedicated tension adjustment mechanisms, relying solely on the film's own weight or simple pressure rollers to maintain tension. This lack of dynamic tension adjustment based on changes in film roll diameter and film material further exacerbates the instability of the conveying process. Utility Model Content

[0005] The purpose of this utility model is to provide a vertical packaging machine unwinding and film feeding device to solve the above-mentioned technical problems in the prior art; the preferred technical solution among the many technical solutions provided by this utility model can produce many technical effects, as detailed below.

[0006] To achieve the above objectives, the present invention provides the following technical solution:

[0007] This utility model provides a vertical packaging machine unwinding and film feeding device, including a film feeding frame, an unwinding mechanism, a roll diameter detection mechanism, and a tension feeding mechanism, wherein: the unwinding mechanism is disposed on the film feeding frame; the roll diameter detection mechanism is disposed on the film feeding frame and located above the unwinding mechanism, the roll diameter detection mechanism can detect the diameter of the roll film on the unwinding mechanism in real time, and the unwinding mechanism can adjust the unwinding speed of the roll film according to the roll film diameter; the tension feeding mechanism is disposed on the film feeding frame and is used to stabilize the tension of the bag film.

[0008] Preferably, the film feeding frame is provided with a first mounting rod, and the roll diameter detection mechanism includes a first mounting bracket and a roll diameter sensor, wherein: the first mounting rod is disposed above the unwinding mechanism; the first mounting bracket is fixedly disposed on the first mounting rod; the roll diameter sensor is disposed on the first mounting bracket, and the detection end of the roll diameter sensor faces the unwinding mechanism.

[0009] Preferably, the unwinding mechanism includes an unwinding power assembly, a chuck, and an air shaft, wherein: the output end of the unwinding power assembly is connected to the chuck and can drive the chuck to rotate; the unwinding power assembly can adjust the rotation speed of the chuck according to the diameter of the film roll; the air shaft is rotatably mounted on the film feeding frame, the connecting end of the air shaft is connected to the chuck, and the air shaft is used to mount the film roll.

[0010] Preferably, the film feeding frame is provided with a film splicing mechanism, which includes a pneumatic telescopic assembly, a film splicing platform, and a film pressing rod. The film splicing platform is disposed on the film feeding frame and located downstream of the unwinding mechanism. The film pressing rod is located above the film splicing platform, and a plurality of first buffer rings are sequentially spaced along the axial direction on the film pressing rod. The pneumatic telescopic assembly is fixedly disposed on the film feeding frame, and the telescopic end of the pneumatic telescopic assembly is connected to the film pressing rod and can drive the film pressing rod to move.

[0011] Preferably, the film-attaching mechanism includes a guiding assembly, which includes a guide member and a movable connector, wherein: the guide member is fixedly mounted on the film feeding frame; the movable connector is slidably mounted on the guide member, and the movable connector is connected to the film-pressing rod.

[0012] Preferably, the film splicing mechanism includes a pressing bracket, an adhesive tape bonding plate, and a film pressing shaft, wherein: the film pressing shaft, the pressing bracket, and the adhesive tape bonding plate are all located above the film splicing platform; the pressing bracket is swayably mounted on the film feeding frame, and the movable connecting member abuts against the pressing bracket; the adhesive tape bonding plate is mounted on the pressing bracket; the film pressing shaft is fixedly mounted on the pressing bracket and located above the film splicing platform, and a plurality of second buffer rings are sequentially spaced along the axial direction on the film pressing shaft.

[0013] Preferably, the tension feeding mechanism includes a tensioning power assembly, a swing tensioning roller assembly, and an angle sensor, wherein: the tensioning power assembly is connected to the swing tensioning roller assembly and can drive the swing tensioning roller assembly to swing, so as to tension the bag film; the angle sensor is used to detect the swing angle of the swing tensioning roller assembly.

[0014] Preferably, the unwinding and film feeding device of the vertical packaging machine includes a correction mechanism, which includes a correction motor and a correction actuator connected to the correction motor. The correction motor is equipped with an encoder, and the actuating end of the correction actuator is connected to the film feeding frame. A sliding member is fixedly installed on the film feeding frame, and a guide member is installed on the frame of the vertical packaging machine. The sliding member is slidably sleeved on the guide member.

[0015] Preferably, the unwinding and film feeding device of the vertical packaging machine includes a color mark assembly, the color mark assembly includes a second mounting bracket and a color mark sensor, and a second mounting rod is provided on the film feeding frame, wherein: the second mounting bracket is disposed on the second mounting rod; and the color mark sensor is disposed on the second mounting bracket.

[0016] Preferably, the unwinding and film feeding device of the vertical packaging machine includes a bag length detection component, the bag length detection component includes a third mounting bracket and a bag length detection encoder, and a third mounting rod is provided on the film feeding frame, wherein: the third mounting bracket is disposed on the third mounting rod; and the bag length detection encoder is disposed on the third mounting bracket.

[0017] The vertical packaging machine unwinding and film feeding device provided by this utility model has at least the following beneficial effects:

[0018] 1. Real-time sensing of roll diameter and dynamic adjustment of unwinding speed to solve the "speed control failure" problem:

[0019] The roll diameter detection mechanism, positioned above the unwinding mechanism, can detect the dynamic changes in the roll diameter (from the maximum diameter to the core diameter) in real time and with high accuracy. Based on this real-time roll diameter data, the unwinding mechanism can adjust the unwinding speed. When the roll diameter is large, the unwinding speed is appropriately reduced to prevent excessive film accumulation during transport; when the roll diameter is small, the unwinding speed is appropriately increased to prevent insufficient film stretching. This "roll diameter-speed" linkage adjustment mechanism completely solves the problem of speed mismatch between existing devices and subsequent processes caused by fixed rotation speeds. It ensures that the film transport speed always matches the required speed for subsequent processes such as bag making and sealing, significantly improving transport continuity and stability, effectively reducing losses such as film wrinkles and breaks, and lowering the risk of production interruptions due to speed control issues.

[0020] 2. A dedicated tension feeding mechanism ensures stable tension and improves packaging quality and precision:

[0021] The tension feeding mechanism provides a dedicated tension adjustment function for bag film conveying, which can provide stable tension for the bag film. This not only avoids bag film deviation and misalignment, but also ensures the sealing performance of subsequent sealing processes (avoiding sealing gaps caused by bag film looseness). As a result, the dimensional accuracy, appearance quality, and sealing performance of packaged products are significantly improved, and the defect rate is reduced. Attached Figure Description

[0022] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0023] Figure 1 This is a schematic diagram of the structure of this utility model from one perspective;

[0024] Figure 2 This is a structural schematic diagram from another perspective of the present invention;

[0025] Figure 3 This is a schematic diagram of the unwinding mechanism of this utility model;

[0026] Figure 4 This is a schematic diagram of the tension feeding mechanism of this utility model;

[0027] Figure 5 This is a schematic diagram of the membrane bonding mechanism of this utility model from one perspective;

[0028] Figure 6 This is a schematic diagram of the membrane bonding mechanism of this utility model from another perspective;

[0029] Figure 7 This is a utility model Figure 1 Enlarged view of part A.

[0030] Figure 8 This is a utility model Figure 1 Enlarged view of part B;

[0031] Figure 9 This is a utility model Figure 2 Enlarged view of part C;

[0032] Figure 10 This is a utility model Figure 2 Enlarged view of part D;

[0033] Figure 11 This is a utility model Figure 5 Enlarged view of part E;

[0034] Figure 12 This is a utility model Figure 5 Enlarged view of part F.

[0035] Figure Labels

[0036] 1. Film feeder; 11. First mounting rod; 12. Second mounting rod; 13. Third mounting rod; 14. Sliding component; 2. Unwinding mechanism; 21. Unwinding power assembly; 22. Chuck; 23. Air shaft; 3. Roll diameter detection mechanism; 31. First mounting bracket; 32. Roll diameter sensor; 4. Tension feeding mechanism; 41. Tensioning power assembly; 42. Oscillating tension roller assembly; 43. Angle sensor; 5. Film splicing mechanism; 51. Pneumatic telescopic assembly; 52. Film splicing platform 53. Pressing rod; 54. First buffer ring; 55. Guide assembly; 551. Guide component; 552. Moving connector; 56. Pressing bracket; 57. Adhesive tape bonding plate; 58. Pressing shaft; 59. Second buffer ring; 6. Correction mechanism; 61. Correction actuator; 62. Correction motor; 7. Color mark assembly; 71. Color mark sensor; 72. Second mounting bracket; 8. Bag length detection assembly; 81. Bag length detection encoder; 82. Third mounting bracket; 9. Guide rod. Detailed Implementation

[0037] To make the objectives, technical solutions, and advantages of this utility model clearer, the technical solutions of this utility model will be described in detail below. Obviously, the described embodiments are only a part of the embodiments of this utility model, and not all of them. Based on the embodiments of this utility model, all other implementation methods obtained by those skilled in the art without creative effort are within the scope of protection of this utility model.

[0038] This utility model provides a vertical packaging machine unwinding and film feeding device, reference. Figures 1 to 12 As shown, the unwinding and film feeding device of the vertical packaging machine includes a film feeding frame 1, an unwinding mechanism 2, a roll diameter detection mechanism 3, and a tension feeding mechanism 4.

[0039] The unwinding mechanism 2 is mounted on the film feeding frame 1; the roll diameter detection mechanism 3 is mounted on the film feeding frame 1 and located above the unwinding mechanism 2. The roll diameter detection mechanism 3 can detect the roll diameter on the unwinding mechanism 2 in real time, and the unwinding mechanism 2 can adjust the unwinding speed of the roll according to the roll diameter; the tension feeding mechanism 4 is mounted on the film feeding frame 1 and is used to stabilize the tension of the bag film.

[0040] During film feeding, the unwinding mechanism 2 releases the bag film, and the tension feeding mechanism 4 operates to ensure the tension of the bag film, thus achieving stable delivery of the bag film.

[0041] During the above process, the roll diameter detection mechanism 3 detects the roll diameter in real time. When the roll diameter is large, the unwinding mechanism 2 reduces the unwinding speed. When the roll diameter is small, the unwinding mechanism 2 increases the unwinding speed, thereby ensuring the continuity and stability of the bag film conveying.

[0042] Meanwhile, during the bag film conveying process, the tension feeding mechanism 4 can provide stable tension for the bag film, reduce bag film offset and misalignment, ensure the subsequent sealing quality of the bag film, and improve packaging quality.

[0043] As an optional implementation, the film feeding frame 1 is provided with a first mounting rod 11, and the roll diameter detection mechanism 3 includes a first mounting bracket 31 and a roll diameter sensor 32.

[0044] The first mounting rod 11 is positioned above the unwinding mechanism 2; the first mounting bracket 31 is fixedly mounted on the first mounting rod 11; the roll diameter sensor 32 is mounted on the first mounting bracket 31, with the detection end of the roll diameter sensor 32 facing the unwinding mechanism 2.

[0045] The first mounting bracket 31 can stably support the roll diameter sensor 32, enabling the roll diameter sensor 32 to accurately and stably detect the roll diameter in real time, thus ensuring the accuracy of the unwinding speed adjustment.

[0046] As an optional implementation, the unwinding mechanism 2 includes an unwinding power assembly 21, a chuck 22, and an air shaft 23. The output end of the unwinding power assembly 21 is connected to the chuck 22 and can drive the chuck 22 to rotate. The unwinding power assembly 21 can adjust the rotation speed of the chuck 22 according to the diameter of the film roll. The air shaft 23 is rotatably mounted on the film feeder 1 through bearings, and the connecting end of the air shaft 23 is connected to the chuck 22.

[0047] The use of an air-expanding shaft 23 facilitates the installation and disassembly of the film roll. The air-expanding shaft can firmly fix the film roll and prevent it from sliding or shifting during unwinding.

[0048] The unwinding power assembly 21 is an electric power assembly that provides rotational power for the chuck to rotate, thereby driving the air shaft 23 and the film to rotate to achieve unwinding. It can also adjust the rotation speed of the chuck 22 according to the film diameter detected by the film diameter detection mechanism, so that the unwinding speed is matched with the film diameter, ensuring the stability and reliability of the unwinding process.

[0049] As an optional implementation, the film feeding frame 1 is provided with a film receiving mechanism 5, which includes a pneumatic telescopic assembly 51, a film receiving platform 52, and a film pressing rod 53.

[0050] The film splicing platform 52 is fixedly installed on the film feeding frame 1 and located downstream of the unwinding mechanism 2. The film splicing platform 52 provides a platform for the smooth splicing of new and old films.

[0051] The pressure rod 53 is located above the film receiving platform 52. Multiple first buffer rings 54 are sequentially spaced along the axial direction on the pressure rod 53. The pressure rod 53 is used to press the film roll. The first buffer rings 54 are made of nitrile rubber, which has good elasticity and avoids damage to the film roll during the pressing process.

[0052] The pneumatic telescopic assembly 51 uses a cylinder and is fixedly mounted on the film feeding frame 1. The telescopic end of the pneumatic telescopic assembly 51 is connected to the film pressing rod 53 and can drive the film pressing rod 53 to move. The pneumatic telescopic assembly 51 provides power for the movement of the film pressing rod 53.

[0053] As an optional implementation, the film-attaching mechanism 5 includes a guide assembly 55, which includes a guide member 551 and a movable connector 552. The guide member 551 is fixedly mounted on the film feeding frame 1; the movable connector 552 is slidably mounted on the guide member 551 and is connected to the film pressing rod 53.

[0054] Specifically, the guide member 551 is configured as a fixing bolt, and the movable connector 552 is configured as a linkage plate. The linkage plate is provided with an elongated hole, through which the fixing bolt passes and slides in cooperation with the elongated hole.

[0055] The guide 551 and the movable connector 552 work together to effectively limit the movement trajectory of the pressure rod 53, making its movement process more stable and reliable.

[0056] As an optional implementation, the film splicing mechanism 5 includes a pressing bracket 56, an adhesive tape bonding plate 57, and a film pressing shaft 58. The film pressing shaft 58, the pressing bracket 56, and the adhesive tape bonding plate 57 are all located above the film splicing platform 52. The pressing bracket 56 is swayably mounted on the film feeding frame 1, and the movable connector 552 abuts against the pressing bracket 56. The adhesive tape bonding plate 57 is mounted on the pressing bracket 56. The film pressing shaft 58 is fixedly mounted on the pressing bracket 56 and is located above the film splicing platform 52. A plurality of second buffer rings 59 are sequentially spaced along the axial direction on the film pressing shaft 58.

[0057] The clamping bracket 56 can be oscillating. Under the action of the movable connector 552, it can drive the tape bonding plate 57 and the film pressing shaft 58 to move. The tape bonding plate 57 makes it easy to use tape to fix the new and old bag films. The second buffer ring 59 on the film pressing shaft 58 can press the bag film after the film is attached to ensure that the bag film is firmly connected and avoid separation during subsequent transportation.

[0058] As an optional implementation, the tension feeding mechanism 4 includes a tensioning power assembly 41, a swing tensioning roller assembly 42, and an angle sensor 43.

[0059] The tensioning power assembly 41 is configured as a telescopic assembly, preferably a cylinder, which is connected to the swing tension roller assembly 42 and can drive the swing tension roller assembly 42 to swing. The swing tension roller assembly 42 includes two opposing swing arms and a plurality of tension rollers connected between the two swing arms, and the bag film passes around the tension rollers in sequence.

[0060] An angle sensor 43 is mounted on the film feeder 1 and is used to detect the swing angle of the swing tension roller assembly 42.

[0061] During the film feeding process, the angle sensor 43 detects the swing angle of the swing tension roller assembly 42 in real time, and the tensioning power assembly 41 acts according to the angle information to ensure the stability of the film tension.

[0062] As an optional implementation, the unwinding and film feeding device of the vertical packaging machine includes a correction mechanism 6. The correction mechanism 6 includes a correction motor 62 and a correction actuator 61 connected to the correction motor 62. The correction motor 62 is equipped with an encoder, and the actuating end of the correction actuator 61 is connected to the film feeding frame 1.

[0063] A sliding component 14 is fixedly installed on the film feeding frame 1, and a guide rod 9 is installed on the frame of the vertical packaging machine. The sliding component 14 is slidably sleeved on the guide rod 9. Specifically, the sliding component 14 is set as a sliding seat, and the guide rod 9 is set as a guide shaft.

[0064] During the film feeding process, when the film roll deviates, the correction motor 62 drives the correction actuator 61 to extend and retract, thereby causing the film feeding frame 1 and the sliding member 14 to move along the guide rod 9, thus realizing the correction of the film roll.

[0065] As an optional implementation, the unwinding and film feeding device of the vertical packaging machine includes a color mark assembly 7, which includes a second mounting bracket 72 and a color mark sensor 71. A second mounting rod 12 is provided on the film feeding frame 1, and the second mounting bracket 72 is provided on the second mounting rod 12. The color mark sensor 71 is provided on the second mounting bracket 72.

[0066] The color mark sensor 71 tracks the pre-printed color mark in real time and provides feedback on the color mark position to assist in subsequent bag sealing and cutting.

[0067] As an optional implementation, the unwinding and film feeding device of the vertical packaging machine includes a bag length detection component 8, which includes a third mounting bracket 82 and a bag length detection encoder 81. A third mounting rod 13 is provided on the film feeding frame 1, and the third mounting bracket 82 is provided on the third mounting rod 13; the bag length detection encoder 81 is provided on the third mounting bracket 82.

[0068] The bag length detection encoder 81 can record the number of pulses, thereby realizing bag length detection, which facilitates subsequent fixed-length cutting.

[0069] In the description of this application, it should be understood that the terms "upper", "lower", "inner", "outer", "top", "bottom", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this application 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. Therefore, they should not be construed as limitations on this application.

[0070] 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 technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this application, "multiple" or "several" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0071] In this application, unless otherwise expressly specified and limited, the terms "installation," "connection," "linking," "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise expressly limited. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0072] The above description is merely a specific embodiment of this utility model, but the protection scope of this utility model is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in this utility model should be included within the protection scope of this utility model. Therefore, the protection scope of this utility model should be determined by the protection scope of the claims.

Claims

1. A vertical packaging machine unwinding and film feeding device, characterized in that, Includes a film feeding frame, an unwinding mechanism, a roll diameter detection mechanism, and a tension feeding mechanism, among which: The unwinding mechanism is mounted on the film feeding frame; The roll diameter detection mechanism is mounted on the film feeding frame and located above the unwinding mechanism. The roll diameter detection mechanism can detect the diameter of the roll film on the unwinding mechanism in real time, and the unwinding mechanism can adjust the unwinding speed of the roll film according to the roll film diameter. The tension feeding mechanism is mounted on the film feeding frame and is used to stabilize the tension of the bag film.

2. The unwinding and film feeding device for a vertical packaging machine according to claim 1, characterized in that, The film feeding frame is provided with a first mounting rod, and the roll diameter detection mechanism includes a first mounting bracket and a roll diameter sensor, wherein: The first mounting rod is positioned above the unwinding mechanism; The first mounting bracket is fixedly mounted on the first mounting rod; The roll diameter sensor is mounted on the first mounting bracket, with the detection end of the roll diameter sensor facing the unwinding mechanism.

3. The unwinding and film feeding device for a vertical packaging machine according to claim 1, characterized in that, The unwinding mechanism includes an unwinding power assembly, a chuck, and an air shaft, wherein: The output end of the unwinding power assembly is connected to the chuck and can drive the chuck to rotate. The unwinding power assembly can adjust the rotation speed of the chuck according to the diameter of the film. The air shaft is rotatably mounted on the film feeding frame, and the connecting end of the air shaft is connected to the chuck. The air shaft is used to install the film roll.

4. The unwinding and film feeding device for a vertical packaging machine according to claim 1, characterized in that, The film feeding frame is equipped with a film attaching mechanism, which includes a pneumatic telescopic assembly, a film attaching platform, and a film pressing rod, wherein: The film splicing platform is mounted on the film feeding frame and is located downstream of the unwinding mechanism; The pressure rod is located above the film receiving platform, and a plurality of first buffer rings are sequentially spaced along the axial direction on the pressure rod; The pneumatic telescopic assembly is fixedly mounted on the film feeding frame. The telescopic end of the pneumatic telescopic assembly is connected to the film pressing rod and can drive the film pressing rod to move.

5. The unwinding and film feeding device for a vertical packaging machine according to claim 4, characterized in that, The membrane bonding mechanism includes a guiding assembly, which comprises a guide member and a movable connector, wherein: The guide component is fixedly mounted on the film feeding frame; The movable connector is slidably disposed on the guide member, and the movable connector is connected to the pressure rod.

6. The unwinding and film feeding device for a vertical packaging machine according to claim 5, characterized in that, The film-bonding mechanism includes a pressing bracket, an adhesive tape bonding plate, and a film-pressing shaft, wherein: The pressing shaft, the pressing bracket, and the tape bonding plate are all located above the film bonding platform; The clamping bracket is swayably mounted on the film feeding frame, and the movable connector abuts against the clamping bracket; The tape bonding plate is mounted on the clamping bracket; The pressure shaft is fixedly mounted on the clamping bracket and located above the film receiving platform. Multiple second buffer rings are arranged sequentially at intervals along the axial direction on the pressure shaft.

7. The unwinding and film feeding device for a vertical packaging machine according to claim 1, characterized in that, The tension feeding mechanism includes a tensioning power assembly, a swing-type tensioning roller assembly, and an angle sensor, wherein: The tensioning power assembly is connected to the oscillating tensioning roller assembly and can drive the oscillating tensioning roller assembly to oscillate, thereby tensioning the bag film. The angle sensor is used to detect the swing angle of the swing tension roller assembly.

8. The unwinding and film feeding device for a vertical packaging machine according to claim 1, characterized in that, The vertical packaging machine unwinding and film feeding device includes a correction mechanism, which includes a correction motor and a correction actuator connected to the correction motor. The correction motor is equipped with an encoder, and the actuating end of the correction actuator is connected to the film feeding frame. A sliding component is fixedly installed on the film feeding frame, and a guide component is installed on the frame of the vertical packaging machine. The sliding component is slidably sleeved on the guide component.

9. The unwinding and film feeding device for a vertical packaging machine according to claim 1, characterized in that, The vertical packaging machine's unwinding and film feeding device includes a color mark assembly, which includes a second mounting bracket and a color mark sensor. A second mounting rod is provided on the film feeding frame, wherein: The second mounting bracket is mounted on the second mounting rod; The color mark sensor is mounted on the second mounting bracket.

10. The unwinding and film feeding device for a vertical packaging machine according to claim 1, characterized in that, The vertical packaging machine's unwinding and film feeding device includes a bag length detection component, which comprises a third mounting bracket and a bag length detection encoder. A third mounting rod is provided on the film feeding frame. The third mounting bracket is disposed on the third mounting rod; The bag length detection encoder is mounted on the third mounting bracket.

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