Bag sealing and cutting component of automatic bagging machine for formula tobacco shreds

Abstract

The utility model discloses a bag sealing and cutting component of an automatic bagging machine for formula tobacco shreds. The bag sealing and cutting component comprises a mounting frame, and an opening and closing device, a sealing device and a bag cutting device which are mounted on the mounting frame, the opening and closing device comprises a first supporting seat, a second supporting seat and an opening and closing driving part; the first supporting seat is provided with a first clamping face, the second supporting seat is provided with a second clamping face, and a film passing channel allowing a plastic film to be sealed and cut to pass through is formed between the first clamping face and the second clamping face. The first supporting seat and the second supporting seat are driven to get close to each other or get away from each other through the opening-closing driving part, so that the film passing channel is closed or opened; the sealing device is arranged on the first supporting seat; the bag cutting device is arranged on the second supporting seat and comprises a cutter head driving part and a rotary cutter head; and the cutter head driving part drives the rotary cutter head to rotate so as to cut the plastic film in the film passing channel. The bag cutting device has the advantages of being good in cutting effect and capable of guaranteeing that notches are neat and not pulled, and therefore sealing performance and integrity of bags are guaranteed.

Description

Technical Field

[0001] The utility model relates to the technical field of automatic tobacco boxing systems, in particular to a sealing and bag cutting component of an automatic tobacco bagging machine. Background Art

[0002] Currently, tobacco factories primarily perform a series of manual processes, including carton opening, bagging, tobacco packing, weighing, plastic bag sealing, and carton sealing. The economic benefits of a tobacco factory depend on its output, making production efficiency crucial. Manual processes such as carton opening, bagging, packing, and sealing require minimal technical expertise and are time-consuming and labor-intensive. The automatic tobacco bagging and sealing system replaces these processes.

[0003] In the automatic bagging and box-sealing system for blended tobacco, the bagging machine's bag feeding system's sealing and cutting components are crucial. They are responsible for heat-sealing the opening of each bag after the plastic film passes through it and, after sealing, cutting the continuous plastic film into individual bags. Existing sealing and cutting components typically use fixed blades, which have poor cutting performance and can cause the plastic film to tear during subsequent bag opening, compromising the bag's seal and integrity. Utility Model Content

[0004] In order to overcome the shortcomings of the existing technology, the purpose of the utility model is to provide a sealing and cutting bag component of an automatic bagging machine for formula tobacco, which has the characteristics of good cutting effect, can ensure that the incision is neat and without pulling, thereby ensuring the sealing and integrity of the bag.

[0005] The purpose of this utility model is achieved by the following technical solutions:

[0006] A sealing and cutting component of an automatic bagging machine for formula tobacco, characterized by comprising a mounting frame, and an opening and closing device, a sealing device and a bag cutting device mounted on the mounting frame;

[0007] The opening and closing device includes a first support seat, a second support seat and an opening and closing driving member; the first support seat and the second support seat are both slidably connected to the mounting frame, the first support seat has a first clamping surface, the second support seat has a second clamping surface, the first clamping surface and the second clamping surface are arranged opposite to each other, and a film passing channel is formed between the first clamping surface and the second clamping surface, and the film passing channel can be used for the plastic film to be sealed and cut to pass through; the opening and closing driving member is used to drive the first support seat and the second support seat to move closer to or away from each other, thereby closing or opening the film passing channel;

[0008] The sealing device is arranged on the first supporting seat and is used to seal the plastic film in the film passage;

[0009] The bag cutting device is arranged on the second support seat, and the bag cutting device includes a cutter disc drive and a rotating cutter disc. The cutter disc drive has an output end, and the rotating cutter disc is arranged at the output end of the cutter disc drive. The rotating cutter disc is driven by the cutter disc drive to rotate and cut the plastic film in the film passing channel.

[0010] In an optional embodiment, an upper pressure plate and a lower pressure plate are provided on the first clamping surface; when the first support seat and the second support seat approach each other, the upper pressure plate, the lower pressure plate and the second clamping surface are abutted against each other, thereby clamping the plastic film in the film passage.

[0011] In an optional embodiment, an upper buffer strip and a lower buffer strip are provided on the second clamping surface; the upper buffer strip and the lower buffer strip are respectively arranged opposite to the upper pressure plate and the lower pressure plate, and the upper buffer strip and the lower buffer strip have the characteristic of elastic deformation under force; when the first support seat and the second support seat are close to each other, the upper buffer strip and the lower buffer strip are respectively abutted against the upper pressure plate and the lower pressure plate, thereby clamping the plastic film in the film passing channel.

[0012] In an optional embodiment, the sealing device includes a hot knife, a heating element and a push plate, the hot knife is arranged between the upper pressure plate and the lower pressure plate, and the push plate is arranged between the upper buffer bar and the lower buffer bar; the heating element is connected to the hot knife; the hot knife is heated by the heating element, and the hot knife presses the plastic film against the push plate to achieve sealing of the plastic film between the upper pressure plate and the lower pressure plate.

[0013] In an optional embodiment, the sealing device further includes a hot knife driving member, wherein the hot knife driving member has a fixed end and a telescopic end, the fixed end of the hot knife driving member is fixed to the first support seat, and the telescopic end of the hot knife driving member is connected to the hot knife, and the hot knife driving member drives the hot knife to move horizontally, so that the hot knife extends or retracts from between the upper pressure plate and the lower pressure plate.

[0014] In an optional embodiment, the rotating cutter disc forms a blade circumferentially, and the blade is used to cut the plastic film; the rotating cutter disc is arranged between the abutment plate and the lower buffer strip, and the blade extends from the gap between the abutment plate and the lower buffer strip.

[0015] In an optional embodiment, the bag cutting device also includes a knife holder and a knife holder driving member; the knife disc driving member and the rotating knife disc are slidably connected to the second support seat through the knife holder, and the knife holder driving member is connected to the knife holder, so that the rotating knife disc can translate back and forth along the length direction of the second support seat to cut the plastic film.

[0016] In an optional embodiment, the tool holder drive is a rodless cylinder having an outer cylinder, a piston and a guide rod. The outer cylinder is fixed to the second support seat, the guide rod is arranged along the length direction of the second support seat, and the piston is fixed to the tool holder.

[0017] In an optional embodiment, it also includes a film guide plate, which is fixed above the membrane channel. The film guide plate includes two oppositely arranged film guide units, and the film guide unit includes a connecting rod. A plurality of spring plates are spaced apart on one side of the connecting rod; a film guide channel from wide to narrow is formed between the opposite spring plates on the two film guide units.

[0018] In an optional embodiment, a plastic film length measuring device is further included, which is arranged near the film passing channel; the plastic film length measuring device is used to measure the length of the plastic film passing through the film passing channel; when the length of the plastic film passing through the film passing channel reaches a preset length, a signal is sent to the main control system through the plastic film length measuring device to stop feeding the film.

[0019] Compared with the prior art, the beneficial effects of the present invention are:

[0020] The sealing and bag cutting components of the automatic bagging machine for formula tobacco of the present invention deliver the plastic film to the film passing channel by the film feeding component of the automatic bagging machine. When the length of the plastic film passing through the film passing channel reaches a preset length, the plastic film stops being conveyed. The opening and closing driving component of the opening and closing device provides power to drive the first support seat and the second support seat to approach each other, thereby clamping the plastic film between the first clamping surface and the second clamping surface. The knife disc driving component of the bag cutting device drives the rotating knife disc to rotate, thereby cutting the plastic film fixed in the film passing channel, and the sealing device seals the plastic film in the film passing channel, thereby realizing continuous cutting and sealing of the plastic film. Compared with the existing fixed blade, the setting of the rotating knife disc has the characteristics of good cutting effect, which can ensure that the incision is neat and without pulling, thereby ensuring the sealing and integrity of the bag. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 A perspective view of the sealing and cutting components of the automatic bagging machine for formulated cut tobacco of Example 1;

[0022] Figure 2 A perspective view of the sealing and cutting components of the automatic bagging machine for formulated cut tobacco from another angle in Example 1;

[0023] Figure 3 Schematic diagram of the structure of the opening and closing device of the sealing and cutting bag components of the automatic bagging machine for formulated cut tobacco in Example 1;

[0024] Figure 4Schematic diagram of the structure of the bag cutting device of the bag sealing and cutting component of the automatic bagging machine for formulated cut tobacco in Example 1;

[0025] Figure 5 This is a structural diagram of the sealing device of the sealing and bag cutting components of the automatic bagging machine for formulated cut tobacco in Example 1.

[0026] In the figure: 10, mounting frame; 20, opening and closing device; 21, first support seat; 211, upper pressure plate; 212, lower pressure plate; 22, second support seat; 221, upper buffer strip; 222, lower buffer strip; 23, opening and closing drive member; 30, sealing device; 31, hot knife; 32, stop plate; 33, hot knife drive member; 40, bag cutting device; 41, cutter disc drive member; 42, rotating cutter disc; 43, knife holder; 44, knife holder drive member; 50, film guide plate. DETAILED DESCRIPTION

[0027] Below, the present invention is further described in conjunction with the accompanying drawings and specific embodiments. It should be noted that, under the premise of no conflict, the various embodiments described below or the various technical features can be arbitrarily combined to form a new embodiment. Unless otherwise specified, the materials and equipment used in this embodiment can be purchased from the market. Examples of the embodiments are shown in the accompanying drawings, in which the same or similar numbers throughout represent the same or similar elements or elements with the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this application, and cannot be understood as limiting this application.

[0028] In the description of this application, it should be understood that the terms "upper," "lower," "front," "back," "vertical," "horizontal," "top," "bottom," "inner," "outer," and the like, indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings and are intended only to facilitate the description of this application and simplify the description. They do not indicate or imply that the devices or elements referred to must have a specific orientation, be constructed, or operate in a specific orientation. Therefore, they should not be construed as limiting this application. In the description of this application, "plurality" means two or more, unless otherwise specifically specified.

[0029] In the description of this application, it should be noted that, unless otherwise expressly specified or limited, the terms "connected," "connected," and "connected" should be understood in a broad sense. For example, they may refer to a fixed connection, a connection through an intermediary medium, internal communication between two components, or an interaction between two components. Those skilled in the art will understand the specific meanings of the above terms in this application based on the specific circumstances.

[0030] The terms "first," "second," and the like in the specification and claims of this application and the accompanying drawings are used to distinguish similar objects and are not necessarily used to describe a particular order or sequential sequence. In addition, the terms "including," "comprising," and "having," and any variations thereof, are intended to cover non-exclusive inclusions. For example, a process, method, system, product, or apparatus that includes a series of steps or elements is not necessarily limited to those steps or elements explicitly listed, but may include other steps or elements not explicitly listed or inherent to the process, method, product, or apparatus.

[0031] Example 1:

[0032] Please refer to Figure 1-5 This embodiment provides a sealing and cutting unit for an automatic bagging machine for formula tobacco. The unit's primary function is to heat-seal the opening of each bag after a plastic film passes through it, and after sealing, cut the continuous plastic film into individual bags. The unit includes a mounting frame 10, which is primarily constructed from a plurality of profiles and sheet metal materials. The mounting frame 10 comprises several independent structural frames, which are not distinguished here. All of these frames serve to provide support and a mounting base for the various components. The mounting frame 10 is used to mount the unit on the bagging machine frame.

[0033] The mounting frame 10 is provided with an opening and closing device 20, a sealing device 30 and a bag cutting device 40;

[0034] The opening and closing device 20 includes a first support seat 21, a second support seat 22 and an opening and closing drive member 23; the two ends of the first support seat 21 are respectively connected to the mounting frame 10 through a slider rail mechanism, and the two ends of the second support seat 22 are also respectively connected to the mounting frame 10 through a slider rail mechanism; thereby, the first support seat 21 and the second support seat 22 can be translated relative to the mounting frame 10, approaching or moving away from each other. The first support seat 21 has a first clamping surface, and the second support seat 22 has a second clamping surface. The first clamping surface and the second clamping surface are arranged opposite to each other, and a film passing channel is formed between the first clamping surface and the second clamping surface, and the film passing channel can be used for the plastic film to be sealed and cut to pass through; the opening and closing drive member 23 is used to drive the first support seat 21 and the second support seat 22 to approach or move away from each other, thereby closing or opening the film passing channel; specifically, the opening and closing drive member 23 includes a first opening and closing cylinder and a second opening and closing cylinder, and the two first opening and closing cylinders are respectively arranged at both ends of the first support seat 21, for driving the first support seat 21 to approach or move away from the second support seat 22; the two second opening and closing cylinders are respectively arranged at both ends of the second support seat 22, for driving the second support seat 22 to approach or move away from the first support seat 21.

[0035] The sealing device 30 is provided on the first support seat 21 and is used to seal the plastic film in the film passage;

[0036] The bag cutting device 40 is arranged on the second support seat 22. The bag cutting device 40 includes a cutter disc drive 41 and a rotating cutter disc 42. The cutter disc drive 41 has an output end, and the rotating cutter disc 42 is arranged at the output end of the cutter disc drive 41; the rotating cutter disc 42 is driven by the cutter disc drive 41 to rotate to cut the plastic film in the film passing channel.

[0037] Based on the above structure, during use, the plastic film is sent to the film passing channel by the film feeding component of the automatic bagging machine. When the length of the plastic film passing through the film passing channel reaches a preset length, the plastic film stops being conveyed; the opening and closing driving component 23 of the opening and closing device 20 provides power to drive the first support seat 21 and the second support seat 22 to approach each other, clamping the plastic film between the first clamping surface and the second clamping surface; the knife disc driving component 41 of the bag cutting device 40 drives the rotating knife disc 42 to rotate, cutting the plastic film fixed in the film passing channel, and the sealing device 30 seals the plastic film in the film passing channel, thereby realizing continuous cutting and sealing of the plastic film. The setting of the rotating knife disc 42 has the characteristics of good cutting effect compared with the existing fixed blade, and can ensure that the incision is neat and without pulling, thereby ensuring the sealing and integrity of the bag.

[0038] Specifically, an upper pressure plate 211 and a lower pressure plate 212 are provided on the first clamping surface of this embodiment, and an upper buffer bar 221 and a lower buffer bar 222 are provided at the corresponding positions of the second clamping surface, so that the upper buffer bar 221 and the lower buffer bar 222 are respectively arranged opposite to the upper pressure plate 211 and the lower pressure plate 212; the upper buffer bar 221 and the lower buffer bar 222 have the characteristic of elastic deformation under force; when the first support seat 21 and the second support seat 22 approach each other, the upper buffer bar 221 and the lower buffer bar 222 respectively abut against the upper pressure plate 211 and the lower pressure plate 212, thereby clamping the plastic film in the film passing channel, providing a more stable and reliable clamping effect for the plastic film.

[0039] The sealing device 30 of this embodiment includes a hot knife 31, a heating element, and a stop plate 32. The hot knife 31 is disposed between the upper pressing plate 211 and the lower pressing plate 212, and the stop plate 32 is disposed between the upper buffer bar 221 and the lower buffer bar 222. The heating element is connected to the hot knife 31. The sealing device 30 also includes a hot knife driver 33. In this embodiment, the hot knife driver 33 is a telescopic cylinder having a fixed end and a telescopic end. The fixed end of the hot knife driver 33 is fixed to the first support base 21, and the telescopic end of the hot knife driver 33 is connected to the hot knife 31. The hot knife driver 33 drives the hot knife 31 to translate, causing the hot knife 31 to extend or retract from between the upper pressing plate 211 and the lower pressing plate 212. The ironing knife 31 is heated by a heating element, and the ironing knife 31 extends to press the plastic film against the abutment plate 32, thereby sealing the plastic film between the upper pressing plate 211 and the lower pressing plate 212, making the seal smooth and having a good sealing effect. The upper pressing plate 211 and the lower pressing plate 212 also have the function of a guard plate to prevent the ironing knife 31 from contacting the plastic film when in standby state, thereby improving the safety of the equipment.

[0040] The rotary cutter disc 42 of this embodiment is formed with a blade along its circumference, and the blade is used to cut the plastic film. The rotary cutter disc 42 is arranged between the abutment plate 32 and the lower buffer bar 222, and the blade extends from the gap between the abutment plate 32 and the lower buffer bar 222. The abutment plate 32 and the lower buffer bar 222 serve as guards on both sides of the rotary cutter disc 42. The bag cutting device 40 also includes a knife holder 43 and a knife holder driver 44. The knife holder driver 41 and the rotary cutter disc 42 are slidably connected to the second support seat 22 via the knife holder 43, and the knife holder driver 44 is connected to the knife holder 43, so that the rotary cutter disc 42 can translate back and forth along the length direction of the second support seat 22 to cut the plastic film. The knife holder driver 44 is a rodless cylinder having an outer cylinder, a piston, and a guide rod. The outer cylinder is fixed to the second support seat 22, the guide rod is arranged along the length direction of the second support seat 22, and the piston is fixed to the cutter holder 43.

[0041] The cutting depth can be controlled by controlling the amount the blade extends from the gap between the abutment plate 32 and the lower buffer strip 222. The plastic film cutting area is clamped on both sides between the upper pressure plate 211 and the upper buffer strip 221, and the lower pressure plate 212 and the lower buffer strip 222, respectively. This prevents displacement during the cutting process, ensuring a smooth and complete cut of the plastic film. A rodless cylinder acts as a driver, driving the rotating cutter disc 42 back and forth along the length of the second support base 22 to perform the cutting. This provides the rotating cutter disc 42 with efficient, space-saving, and reliable linear power, further improving the bag cutting device 40's effectiveness in cutting plastic film.

[0042] It also includes a film guide plate 50, which is fixed above the film passing channel. The film guide plate 50 includes two oppositely arranged film guide units, and the film guide unit includes a connecting rod, and a plurality of spring plates are spaced apart on one side of the connecting rod; a film guiding channel from wide to narrow is formed between the opposite spring plates on the two film guiding units, and the narrow end is arranged close to the film passing channel between the first clamping surface and the second clamping surface; the plastic film is delivered by the film delivery component of the automatic bagging machine, and enters the film guiding channel of the film guide plate 50 from the wide end, and is guided and automatically adjusted by a plurality of spring plates spaced apart on both sides, so that the plastic film maintains its flatness, ensuring that it accurately enters the film passing channel between the first clamping surface and the second clamping surface.

[0043] Furthermore, it also includes a plastic film length measuring device, which is a plurality of sensors arranged near the film passage; it is used to measure the length of the plastic film passing through the film passage; when the length of the plastic film passing through the film passage reaches a preset length, the sensor sends a signal to the main control system to stop feeding the film.

[0044] In the automatic bagging and box-sealing system for blended tobacco, the bag-sealing and bag-cutting components of the bagging machine's bag-feeding system are crucial components. They are responsible for heat-sealing and cutting the opening of each bag after the plastic film passes through it. The sealing device 30 uses a heating element to heat-seal the two layers of plastic film held between the opening and closing device 20 under a certain pressure, thereby forming the bag seal. Temperature and pressure control ensure a secure and airtight seal to prevent product leakage and moisture. The bag-cutting device 40 cuts the bag at the appropriate location based on the preset bag length. Cutting is accomplished by a cutter drive 41 driving a rotating cutter disc 42 to cut the plastic film within the film-passing channel. This ensures a neat and smooth cut without pulling, ensuring consistent bag size and a neat appearance for each bag, creating a stable, reliable, and uninterrupted bag-feeding system. High-quality sealing and precise cutting ensure a perfect seal and appearance, thereby improving the production efficiency of the automatic bagging and box-sealing system and reducing scrap.

[0045] Although certain components and embodiments of the present application have been illustrated and described, many modifications and changes (e.g., changes in size, dimensions, structure, shape and proportions of the various elements, mounting arrangements, use of materials, colors, orientations, etc.) may occur to those skilled in the art without actually departing from the scope and spirit of the claims.

[0046] Finally, it should be noted that the above-mentioned implementation mode is only a preferred embodiment mode of the present invention and cannot be used to limit the scope of protection of the present invention. Any non-substantial changes and replacements made by technicians in this field on the basis of the present invention fall within the scope of protection required by the present invention.

Claims

1. A sealing and cutting component of an automatic bagging machine for formula tobacco, characterized in that: It includes a mounting frame, and an opening and closing device, a sealing device and a bag cutting device installed on the mounting frame; The opening and closing device includes a first support seat, a second support seat and an opening and closing driving member; the first support seat and the second support seat are both slidably connected to the mounting frame, the first support seat has a first clamping surface, the second support seat has a second clamping surface, the first clamping surface and the second clamping surface are arranged opposite to each other, and a film passing channel is formed between the first clamping surface and the second clamping surface, and the film passing channel can be used for the plastic film to be sealed and cut to pass through; the opening and closing driving member is used to drive the first support seat and the second support seat to move closer to or away from each other, thereby closing or opening the film passing channel; The sealing device is arranged on the first supporting seat and is used to seal the plastic film in the film passage; The bag cutting device is arranged on the second support seat, and the bag cutting device includes a cutter disc drive and a rotating cutter disc. The cutter disc drive has an output end, and the rotating cutter disc is arranged at the output end of the cutter disc drive. The rotating cutter disc is driven by the cutter disc drive to rotate and cut the plastic film in the film passing channel.

2. The sealing and cutting bag component of the automatic bagging machine for formula tobacco according to claim 1, characterized in that: An upper pressing plate and a lower pressing plate are provided on the first clamping surface; when the first support seat and the second support seat are close to each other, the upper pressing plate, the lower pressing plate and the second clamping surface are pressed against each other, thereby clamping the plastic film in the film passage.

3. The sealing and cutting bag component of the automatic bagging machine for formula tobacco according to claim 2, characterized in that: An upper buffer bar and a lower buffer bar are provided on the second clamping surface; the upper buffer bar and the lower buffer bar are respectively arranged opposite to the upper pressure plate and the lower pressure plate, and the upper buffer bar and the lower buffer bar have the characteristic of elastic deformation when subjected to force; when the first support seat and the second support seat are close to each other, the upper buffer bar and the lower buffer bar are respectively abutted against the upper pressure plate and the lower pressure plate, thereby clamping the plastic film in the film passing channel.

4. The sealing and cutting component of the automatic bagging machine for formula tobacco according to claim 3, characterized in that: The sealing device includes a hot knife, a heating element and a push plate. The hot knife is arranged between the upper pressing plate and the lower pressing plate, and the push plate is arranged between the upper buffer bar and the lower buffer bar. The heating element is connected to the hot knife. The hot knife is heated by the heating element, and the hot knife presses the plastic film against the push plate to achieve sealing of the plastic film between the upper pressing plate and the lower pressing plate.

5. The sealing and cutting bag component of the automatic bagging machine for formula tobacco according to claim 4, characterized in that: The sealing device also includes a hot knife driving component, which has a fixed end and a telescopic end. The fixed end of the hot knife driving component is fixed to the first support seat, and the telescopic end of the hot knife driving component is connected to the hot knife. The hot knife driving component drives the hot knife to move horizontally, so that the hot knife extends or retracts from between the upper pressure plate and the lower pressure plate.

6. The sealing and cutting component of the automatic bagging machine for formula tobacco according to claim 4, characterized in that: The rotating cutter disc forms a blade in the circumference thereof, and the blade is used for cutting the plastic film; the rotating cutter disc is arranged between the abutment plate and the lower buffer strip, and the blade extends from the gap between the abutment plate and the lower buffer strip.

7. The sealing and cutting component of the automatic bagging machine for formula tobacco according to claim 6, characterized in that: The bag cutting device also includes a knife holder and a knife holder driving member; the knife disc driving member and the rotating knife disc are slidably connected to the second support seat through the knife holder, and the knife holder driving member is connected to the knife holder, so that the rotating knife disc can move back and forth along the length direction of the second support seat to cut the plastic film.

8. The sealing and cutting bag component of the automatic bagging machine for formula tobacco according to claim 7, characterized in that: The tool holder driving component is a rodless cylinder, which has an outer cylinder, a piston and a guide rod. The outer cylinder is fixed to the second support seat, the guide rod is arranged along the length direction of the second support seat, and the piston is fixed to the tool holder.

9. The sealing and cutting component of the automatic bagging machine for formula tobacco according to claim 1, characterized in that: It also includes a film guide plate, which is fixed above the membrane channel. The film guide plate includes two oppositely arranged film guide units. The film guide unit includes a connecting rod, and a plurality of spring plates are spaced apart on one side of the connecting rod; a film guide channel from wide to narrow is formed between the opposite spring plates on the two film guide units.

10. The sealing and cutting component of the automatic bagging machine for formula tobacco according to claim 1, characterized in that: It also includes a plastic film length measuring device, which is arranged near the film passing channel; the plastic film length measuring device is used to measure the length of the plastic film passing through the film passing channel; when the length of the plastic film passing through the film passing channel reaches a preset length, the plastic film length measuring device sends a signal to the main control system to stop feeding the film.

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