A bag-opening mechanism for M-film and a bag-packing auxiliary device

Abstract

This utility model relates to an M-film bag opening mechanism and a bag-packing auxiliary device. The M-film bag opening mechanism includes: a slide base; two sets of M-film bag opening modules slidably disposed on the slide base, the two sets of M-film bag opening modules moving towards each other; each M-film bag opening module includes a first bag opening retraction cylinder, a second bag opening retraction cylinder connected to the moving end of the first bag opening retraction cylinder, a bag-supporting cylinder assembly connected to the moving end of the second bag opening retraction cylinder and used to expand the M-film, and a bag-rubbing cylinder assembly connected to the body of the second bag opening retraction cylinder and used to rub open the inserted edge of the M-film; and a bag opening cylinder for driving the entire M-film bag opening module to move along the slide base. Compared with the prior art, this utility model has the advantages of being economical, hygienic, reliable, and efficient.

Description

Technical Field

[0001] This utility model relates to the field of packaging machinery technology, and in particular to an M-film bag opening mechanism and bag-packing auxiliary device. Background Technology

[0002] M-film is a specially designed packaging material, named for its unique "M-shaped" interlocking structure in cross-section. This structure, through symmetrical folded interlocking edges on both sides of the film, significantly enhances the three-dimensional stability, compressive strength, and leak-proof performance of the packaging bag. M-film is typically made of food-grade plastics such as polyethylene (PE) and polypropylene (PP), possessing good flexibility, tear resistance, and sealing properties. In central kitchens and the food industry, M-film is widely used for packaging pre-prepared dishes, cooked foods, and semi-finished products. Its M-shaped structure not only better maintains the shape of the contents but also effectively prevents bag deformation during vacuum packaging, extending the shelf life of food. Furthermore, M-film packaging is also commonly found in chemical and pharmaceutical industries where high packaging stability is required.

[0003] Patent publication number CN213620527U discloses a novel M-bag opening and shaping device and a carton bagging machine. The device includes two parallel crossbeams, an M-bag, and several opening components and shaping components slidably mounted on the crossbeams. The opening components are positioned opposite each other on two opposite sides of the M-bag, and the shaping components are positioned opposite each other on two other opposite sides of the M-bag. Each opening component has a gripping thumb for holding the M-bag, and each shaping component has a support plate for opening the M-bag. This novel M-bag opening and shaping device uses a thumb to open the bag and then uses the support plate to open it further, making it convenient to use, providing accurate gripping, minimizing bag damage, and offering high efficiency.

[0004] This M-bag opening and shaping device uses a servo motor to precisely control the movement of a synchronous belt, which in turn drives the synchronous belt clamp on the opening linkage to achieve precise positioning of the opening component. However, this drive scheme has extremely demanding requirements for the working environment. In practical applications such as central kitchens, high temperature, high humidity, and frequent cleaning operations significantly increase the failure rate of the servo motor drive system and generate micro-debris contamination. After long-term use, the synchronous belt also faces the risk of positioning inaccuracy due to tensile wear. In addition, the shaping component relies on only a single cylinder for propulsion and retraction. This design suffers from insufficient motion stability due to the cantilever effect, limited positioning accuracy of the support plate, and the single cylinder cannot achieve precise stopping at the intermediate position or flexible force control, resulting in poor adaptability when switching between different packaging bag sizes. Utility Model Content

[0005] The purpose of this invention is to overcome the applicability defects of the prior art in the central kitchen environment by providing an economical, hygienic, reliable and efficient M-film bag opening mechanism and bagging auxiliary device.

[0006] The objective of this utility model can be achieved through the following technical solutions:

[0007] An M-film opening mechanism for opening M-film bags, the M-film opening mechanism comprising:

[0008] Slide;

[0009] Two sets of M-film opening modules are slidably mounted on the slide block. The two sets of M-film opening modules move towards each other. Each set of M-film opening modules includes a first opening retraction cylinder, a second opening retraction cylinder connected to the moving end of the first opening retraction cylinder, a bag-supporting cylinder assembly connected to the moving end of the second opening retraction cylinder and used to open the M-film, and a bag-rubbing cylinder assembly connected to the body of the second opening retraction cylinder and used to rub open the inserted edge of the M-film.

[0010] And an opening cylinder that drives the entire M-film opening module to move along the slide.

[0011] Furthermore, the moving ends of the first bag opening retraction cylinder and the second bag opening retraction cylinder move along the travel direction of the slide block.

[0012] Furthermore, the bag-supporting cylinder assembly includes:

[0013] A first connecting base connected to the movable end of the second bag-opening retraction cylinder;

[0014] A rotary cylinder mounted on the first connecting base;

[0015] And a bag-supporting rod connected at one end to the rotating end of the rotary cylinder, the bag-supporting rod rotating between a first position and a second position under the drive of the rotary cylinder. By rotating the bag-supporting rod to support the inside of the M film, and then retracting it to open the M film more thoroughly, it prepares for the subsequent bagging work.

[0016] Furthermore, the first position is a roughly horizontal position, and the second position is a roughly vertical position. The roughly horizontal position means that it has a deviation of ±5° in the horizontal direction, and the roughly vertical position means that it has a deviation of ±5° in the vertical direction.

[0017] Furthermore, the bottom of the first connecting base is provided with a fourth slider that is slidably connected to the slide and can move along it.

[0018] Furthermore, the bag-making cylinder assembly includes:

[0019] The second connecting base is connected to the body of the second bag opening and retraction cylinder;

[0020] The bag-rubbing cylinder is installed on the second connecting base;

[0021] The two sets of clamping plates connected to the bag-rubbing cylinder include an upper clamping plate connected to the moving end of the bag-rubbing cylinder and a lower clamping plate connected to the body of the bag-rubbing cylinder;

[0022] The bag-making wheels connected to the clamping plate include an upper bag-making wheel connected to one end of the upper clamping plate and a lower bag-making wheel connected to one end of the lower clamping plate.

[0023] Furthermore, the moving end of the bag-rubbing cylinder moves in the vertical direction.

[0024] Furthermore, the second connecting base is provided with a vertically arranged slide rail, which is located on one side of the bag-making cylinder. One end of the upper clamping plate is provided with a first slider, which is slidably connected to the slide rail and can move along it.

[0025] Furthermore, a second slider is provided on one side of the bag-making cylinder body, and the second slider is slidably connected to the slide rail and can move along it.

[0026] Furthermore, the slide rail is provided with a limiting block to restrict the sliding position of the second slider.

[0027] Furthermore, the limiting block includes an upper limiting block and a lower limiting block located at the upper and lower ends of the slide rail, respectively. The setting of the upper and lower limiting blocks precisely controls the opening stroke of the bag-rubbing roller, which can ensure that the M film insertion edge is fully rubbed open, while preventing excessive stretching that could cause deformation of the M film.

[0028] Furthermore, the upper and lower bag-rubbing rollers on the two sets of M-film opening modules are arranged in a staggered configuration. This staggered roller layout significantly enhances adaptability to packaging bags of different sizes. The staggered arrangement of the upper and lower rollers on the two sets of M-film opening modules automatically adapts to M-films of varying thicknesses and materials, ensuring reliable gripping and gentle opening under various working conditions. Compared to a simple staggered clamping plate design, the roller structure provides a larger contact area and a more uniform stress distribution, effectively reducing the breakage rate of thin and brittle packaging bags, making it particularly suitable for various food packaging materials commonly found in central kitchens.

[0029] Furthermore, an elastic floating mechanism is provided between the second slider and the slide rail, enabling the second slider to achieve adaptive floating displacement in the vertical direction. The elastic floating mechanism adopts a conventional structure in the art, and includes a pressure adjustment component consisting of a preload spring and a pressure adjustment bolt. The floating pressure range of the second slider is controlled by adjusting the preload force of the preload spring.

[0030] Furthermore, the bottom of the first bag opening and retraction cylinder is provided with a first base plate, and the bottom of the first base plate is provided with a third slider that is slidably connected to the slide block and can move along it.

[0031] Furthermore, the bag-opening cylinder is arranged parallel to the slide block, and the first base plate is connected to the moving end of the bag-opening cylinder.

[0032] Furthermore, the second connecting base is located at the bottom of the second bag opening retraction cylinder and the bag rubbing cylinder, and the bottom of the second connecting base is provided with a fifth slider that is slidably connected to the slide and can move along it.

[0033] Furthermore, the moving end of the bag-opening cylinder is provided with a limiting member that restricts its maximum travel distance, and the limiting member adopts a conventional structure in the art.

[0034] Furthermore, when opening the M film, two M film opening mechanisms are used, respectively set on both sides of the M film, with a total of four M film opening modules to realize the opening of the four corners of the M film.

[0035] An M-film bagging auxiliary device, the bagging auxiliary device including the aforementioned M-film opening mechanism, for performing bagging work after the M-film is opened.

[0036] Compared with the prior art, the present invention has the following advantages:

[0037] (1) This utility model adopts a fully pneumatic drive scheme instead of a servo motor drive, completely solving the applicability problem of the electrical system in a central kitchen environment. The bag-opening cylinder drives the overall M-film bag-opening module, the first and second bag-opening retraction cylinders achieve precise positioning, the bag-rubbing cylinder controls the clamping action, and the rotary cylinder controls the rotation of the bag-supporting rod, thus constructing a complete pneumatic execution system. This design makes full use of compressed air as a power source, completely avoiding the problems of servo motors and synchronous belt systems being prone to failure and generating micro-debris contamination in humid environments. The cost of pneumatic components is significantly lower than that of servo systems, and maintenance is simple. Ordinary operators can complete the replacement of cylinders or solenoid valves after basic training, greatly reducing maintenance costs and maintenance time throughout the equipment's life cycle, making it particularly suitable for central kitchen environments that require continuous production.

[0038] (2) This utility model employs a bag-opening cylinder, a first bag-opening retraction cylinder, and a second bag-opening retraction cylinder for movement along the slide direction. The bag-opening cylinder is responsible for the large-stroke movement, providing the main power output and quickly moving the entire M-film bag-opening module to the vicinity of the working area, effectively shortening the idle time and improving work efficiency. The first and second bag-opening retraction cylinders are responsible for small-stroke precision adjustment. Through the series cooperation of the first and second bag-opening retraction cylinders, micron-level precise positioning is achieved. This clearly defined control principle is similar to the "rapid feed-coarse positioning-fine positioning" working mode of CNC machine tools, ensuring both motion efficiency and final position accuracy.

[0039] (3) This utility model adopts a design in which the first bag-opening retraction cylinder and the second bag-opening retraction cylinder are arranged in series, which effectively solves the cantilever effect and motion instability problems of a single shaping cylinder. The first bag-opening retraction cylinder is responsible for rapid positioning with a large stroke, while the second bag-opening retraction cylinder is responsible for fine adjustment with a small stroke. This hierarchical control strategy ensures both the movement speed and the accuracy of the final position. The series arrangement of the first and second bag-opening retraction cylinders ensures that the force is transmitted along the same axis, completely eliminating lateral torque and ensuring that the bag-supporting cylinder assembly and the bag-rubbing cylinder assembly remain stable during movement without shaking or jamming. This design significantly improves the adaptability to packaging bags of different specifications. By adjusting the pressure and stroke of the two cylinders, the opening force can be precisely controlled, effectively reducing the bag breakage rate. At the same time, it forms functional redundancy, reducing the risk of downtime caused by single-point failure.

[0040] (4) The bag-rubbing cylinder assembly of this utility model adopts a unique bag-rubbing wheel design to replace the traditional clamping structure. Through the staggered arrangement of the upper and lower bag-rubbing wheels, a gentler and more efficient bag-opening method is achieved. Compared with the simple direct clamping of the upper and lower clamping plates, the rolling friction of the bag-rubbing wheels replaces the sliding friction, which significantly reduces the risk of wear on the surface of the M film and avoids the instantaneous impact damage to the film caused by the traditional clamping mechanism.

[0041] (5) By setting the first slider and the slide rail, this utility model ensures that the upper clamping plate always moves along the predetermined trajectory, eliminating lateral sway. On this basis, a second slider can be set on the bag-rubbing cylinder, thereby driving the upper and lower clamping plates to move synchronously, so that this set of bag-rubbing wheels can float up and down, thereby forming a squeeze with the bag-rubbing wheels of another set of M film bag-opening modules, which can achieve more precise bag opening.

[0042] (6) This utility model, through its modular architecture design, independently arranges each functional module, significantly improving the hygiene performance and ease of maintenance of the equipment. Each cylinder component is modularly installed via a standardized connecting base and slider mechanism, forming a simple and smooth outline, avoiding cleaning dead spots and areas where contaminants accumulate. This design allows all surfaces of the equipment to be efficiently cleaned and thoroughly disinfected, fully meeting the stringent requirements of food hygiene standards such as HACCP. Simultaneously, the modular design simplifies and expedites fault diagnosis and component replacement. When a cylinder or slider requires maintenance, it can be disassembled and replaced individually without affecting the entire equipment, greatly reducing downtime and improving the overall operational efficiency of the production line. Attached Figure Description

[0043] Figure 1 This is a schematic diagram of the M-film opening mechanism shown in Example 1;

[0044] Figure 2 This is a schematic diagram of the M-film opening mechanism shown in Example 1 from another perspective;

[0045] Figure 3 This is a front view of the M-film opening mechanism shown in Example 1;

[0046] Figure 4 This is a top view of the M-film opening mechanism shown in Example 1;

[0047] Figure 5 This is a left view of the M-film opening mechanism shown in Example 1;

[0048] Figure 6 This is a schematic diagram of the bag-rubbing cylinder assembly (without the second slider) shown in Example 1;

[0049] Figure 7 This is a front view of the bag-making cylinder assembly (without the second slider) shown in Example 1;

[0050] Figure 8 This is a top view of the bag-rubbing cylinder assembly (without the second slider) shown in Example 1;

[0051] Figure 9 This is a right view of the bag-rubbing cylinder assembly (without the second slider) shown in Example 1;

[0052] Figure 10 This is a schematic diagram of the bag-rubbing cylinder assembly (with a second slider) shown in Example 1;

[0053] Figure 11 This is a front view of the bag-making cylinder assembly (with a second slider) shown in Example 1;

[0054] Figure 12This is a top view of the bag-rubbing cylinder assembly (with a second slider) shown in Example 1;

[0055] Figure 13 This is a left view of the bag-making cylinder assembly (with a second slider) shown in Example 1.

[0056] Explanation of markings in the diagram:

[0057] 1-Slide;

[0058] 2-M film bag opening module,

[0059] 21-First bag opening and retraction cylinder, 211-First base plate, 2111-Third slider,

[0060] 22-Second bag opening retraction cylinder,

[0061] 23-Bag-supporting cylinder assembly, 231-First connecting base, 2311-Fourth slider, 232-Rotary cylinder, 233-Bag-supporting rod.

[0062] 24-Bag-rubbing cylinder assembly, 241-Second connecting base, 2411-Fifth slider, 242-Bag-rubbing cylinder, 2421-Second slider, 243-Upper clamping plate, 2431-First slider, 244-Lower clamping plate, 245-Upper bag-rubbing wheel, 246-Lower bag-rubbing wheel, 247-Slide rail, 248-Limiting block, 2481-Upper limiting block, 2482-Lower limiting block;

[0063] 3-Bag opening cylinder. Detailed Implementation

[0064] The present invention will now be described in detail with reference to the accompanying drawings and specific embodiments. The embodiments are implemented based on the technical solution of the present invention, providing detailed implementation methods and specific operating procedures. However, the scope of protection of the present invention is not limited to the following embodiments. In the following embodiments or examples, unless otherwise specified, the functional components or structures are conventional components or structures used in the art to achieve the corresponding functions.

[0065] It should be noted that in the description of this utility model, the terms "upper," "lower," "inner," "outer," "front end," "rear end," "both ends," "one end," and "the other end," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this utility model and for 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 utility model. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0066] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installed," "equipped with," and "connected," etc., should be interpreted broadly. For example, "connected" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium; it can be a connection within two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0067] An M-film opening mechanism for opening M-film bags, the M-film opening mechanism comprising:

[0068] Slide 1;

[0069] Two sets of M-film opening modules 2 are slidably disposed on the slide block 1. The two sets of M-film opening modules 2 move towards each other. Each set of M-film opening modules 2 includes a first opening retraction cylinder 21, a second opening retraction cylinder 22 connected to the moving end of the first opening retraction cylinder 21, a bag-supporting cylinder assembly 23 connected to the moving end of the second opening retraction cylinder 22 and used to open the M-film, and a bag-rubbing cylinder assembly 24 connected to the body of the second opening retraction cylinder 22 and used to rub the inserted edge of the M-film.

[0070] And the bag-opening cylinder 3 that drives the M-film bag-opening module 2 to move along the slide block 1.

[0071] In some specific embodiments, the moving ends of the first bag opening retraction cylinder 21 and the second bag opening retraction cylinder 22 move along the stroke direction of the slide block 1.

[0072] In some specific embodiments, the bag-supporting cylinder assembly 23 includes:

[0073] A first connecting base 231 connected to the movable end of the second bag opening retraction cylinder 22;

[0074] A rotary cylinder 232 is mounted on the first connecting base 231;

[0075] And a bag-supporting rod 233, one end of which is connected to the rotating end of the rotary cylinder 232, rotates between a first position and a second position under the drive of the rotary cylinder 232. By rotating the bag-supporting rod 233 to support the inside of the M-film, and then retracting it to open the M-film more thoroughly, it prepares for the subsequent bagging work.

[0076] In some specific embodiments, the first position is a generally horizontal position, and the second position is a generally vertical position. The generally horizontal position means that it has a deviation of ±5° in the horizontal direction, and the generally vertical position means that it has a deviation of ±5° in the vertical direction.

[0077] In some specific embodiments, the bottom of the first connecting base 231 is provided with a fourth slider 2311 that is slidably connected to the slide block 1 and can move along it.

[0078] In some specific embodiments, the bag-making cylinder assembly 24 includes:

[0079] The second connecting base 241 is connected to the body of the second bag opening retraction cylinder 22;

[0080] The bag-rubbing cylinder 242 is installed on the second connecting base 241;

[0081] The two sets of clamping plates connected to the bag-rubbing cylinder 242 include an upper clamping plate 243 connected to the moving end of the bag-rubbing cylinder 242 and a lower clamping plate 244 connected to the body of the bag-rubbing cylinder 242.

[0082] The bag-rubbing wheels connected to the clamping plate include an upper bag-rubbing wheel 245 connected to one end of the upper clamping plate 243 and a lower bag-rubbing wheel 246 connected to one end of the lower clamping plate 244.

[0083] In some specific embodiments, the moving end of the bag-rubbing cylinder 242 moves in a vertical direction.

[0084] In some specific embodiments, the second connecting base 241 is provided with a vertically arranged slide 247, the slide 247 is located on one side of the bag-making cylinder 242, and one end of the upper clamping plate 243 is provided with a first slider 2431, the first slider 2431 is slidably connected to the slide 247 and can move along it.

[0085] In some specific embodiments, a second slider 2421 is provided on one side of the body of the bag-making cylinder 242. The second slider 2421 is slidably connected to the slide rail 247 and can move along it.

[0086] In some specific embodiments, the slide 247 is provided with a limiting block 248 to restrict the sliding position of the second slider 2421.

[0087] In some specific embodiments, the limiting block 248 includes an upper limiting block 2481 and a lower limiting block 2482 located at the upper and lower ends of the slide 247, respectively. The setting of the upper limiting block 2481 and the lower limiting block 2482 precisely controls the opening stroke of the bag-rubbing roller, which can ensure that the M film insertion edge is fully rubbed open, while preventing excessive stretching that could cause deformation of the M film.

[0088] In some specific embodiments, the upper bag-rubbing rollers 245 and lower bag-rubbing rollers 246 on the two sets of M-film opening modules 2 are arranged in an alternating manner. This alternating arrangement of the bag-rubbing rollers significantly enhances adaptability to packaging bags of different sizes. The alternating arrangement of the upper bag-rubbing rollers 245 and lower bag-rubbing rollers 246 on the two sets of M-film opening modules 2 allows for automatic adaptation to M-films of different thicknesses and materials, ensuring reliable gripping and gentle opening under various working conditions. Compared to a simple alternating clamp design, the bag-rubbing roller structure provides a larger contact area and a more uniform stress distribution, effectively reducing the breakage rate of thin and brittle packaging bags, making it particularly suitable for various food packaging materials commonly found in central kitchens.

[0089] In some specific embodiments, an elastic floating mechanism is provided between the second slider 2421 and the slide rail 247, enabling the second slider 2421 to achieve adaptive floating displacement in the vertical direction. The elastic floating mechanism adopts a conventional structure in the art and includes a pressure adjustment component, which consists of a preload spring and a pressure adjustment bolt. The floating pressure range of the second slider 2421 is controlled by adjusting the preload force of the preload spring.

[0090] In some specific embodiments, the bottom of the first bag opening and retraction cylinder 21 is provided with a first base plate 211, and the bottom of the first base plate 211 is provided with a third slider 2111 that is slidably connected to the slide block 1 and can move along it.

[0091] In some specific embodiments, the bag-opening cylinder 3 is arranged parallel to the slide 1, and the first base plate 211 is connected to the moving end of the bag-opening cylinder 3.

[0092] In some specific embodiments, the second connecting base 241 is located at the bottom of the second bag opening and bag opening retraction cylinder 22 and the bag rubbing cylinder 242, and the bottom of the second connecting base 241 is provided with a fifth slider 2211 that is slidably connected to the slide block 1 and can move along it.

[0093] In some specific embodiments, the moving end of the bag-opening cylinder 3 is provided with a limiting member that restricts its maximum travel distance, and the limiting member adopts a conventional structure in the art.

[0094] In some specific embodiments, when opening the M film, two M film opening mechanisms are used, respectively set on both sides of the M film, with a total of four M film opening modules 2, to realize the opening of the four corners of the M film.

[0095] An M-film bagging auxiliary device, the bagging auxiliary device including the aforementioned M-film opening mechanism, for performing bagging work after the M-film is opened.

[0096] Each of the above embodiments can be implemented individually or in any combination of two or more.

[0097] The following description uses specific examples to illustrate the point.

[0098] Example 1

[0099] like Figures 1-5 As shown, an M-film opening mechanism is used for opening M-film bags, the M-film opening mechanism comprising:

[0100] Slide 1;

[0101] Two sets of M-film opening modules 2 are slidably disposed on the slide block 1. The two sets of M-film opening modules 2 move towards each other. Each set of M-film opening modules 2 includes a first opening retraction cylinder 21, a second opening retraction cylinder 22 connected to the moving end of the first opening retraction cylinder 21, a bag-supporting cylinder assembly 23 connected to the moving end of the second opening retraction cylinder 22 and used to open the M-film, and a bag-rubbing cylinder assembly 24 connected to the body of the second opening retraction cylinder 22 and used to rub the inserted edge of the M-film.

[0102] And the bag-opening cylinder 3 that drives the M-film bag-opening module 2 to move along the slide block 1.

[0103] In this embodiment, the moving ends of the first bag opening retraction cylinder 21 and the second bag opening retraction cylinder 22 move along the stroke direction of the slide block 1.

[0104] In this embodiment, the bag-supporting cylinder assembly 23 includes:

[0105] A first connecting base 231 connected to the movable end of the second bag opening retraction cylinder 22;

[0106] A rotary cylinder 232 is mounted on the first connecting base 231;

[0107] And a bag support rod 233, one end of which is connected to the rotating end of the rotary cylinder 232, the bag support rod 233 rotating between a first position and a second position under the drive of the rotary cylinder 232.

[0108] In this embodiment, the first position is a roughly horizontal position, and the second position is a roughly vertical position. The roughly horizontal position means that it has a deviation of ±5° in the horizontal direction, and the roughly vertical position means that it has a deviation of ±5° in the vertical direction.

[0109] In this embodiment, the bottom of the first connecting base 231 is provided with a fourth slider 2311 that is slidably connected to the slide block 1 and can move along it.

[0110] In this embodiment, as Figures 6-9 As shown, the bag-making cylinder assembly 24 includes:

[0111] The second connecting base 241 is connected to the body of the second bag opening retraction cylinder 22;

[0112] The bag-rubbing cylinder 242 is installed on the second connecting base 241;

[0113] The two sets of clamping plates connected to the bag-rubbing cylinder 242 include an upper clamping plate 243 connected to the moving end of the bag-rubbing cylinder 242 and a lower clamping plate 244 connected to the body of the bag-rubbing cylinder 242.

[0114] The bag-rubbing wheels connected to the clamping plate include an upper bag-rubbing wheel 245 connected to one end of the upper clamping plate 243 and a lower bag-rubbing wheel 246 connected to one end of the lower clamping plate 244.

[0115] In this embodiment, the moving end of the bag-rubbing cylinder 242 moves in the vertical direction.

[0116] In this embodiment, the second connecting base 241 is provided with a vertically arranged slide 247, the slide 247 is located on one side of the bag-making cylinder 242, and one end of the upper clamping plate 243 is provided with a first slider 2431, the first slider 2431 is slidably connected to the slide 247 and can move along it.

[0117] In this embodiment, as Figures 10-13 As shown, a second slider 2421 is provided on one side of the body of the bag-rubbing cylinder 242 of one set of M-film bag-opening modules 2. The second slider 2421 is slidably connected to the slide rail 247 and can move along it. Figure 1 The right-side M-film opening module 2 has a second slider 2421. A limiting block 248 is provided on the slide rail 247 to restrict the sliding position of the second slider 2421. The limiting block 248 includes an upper limiting block 2481 and a lower limiting block 2482 located at the upper and lower ends of the slide rail 247, respectively. The upper limiting block 2481 and the lower limiting block 2482 precisely control the opening stroke of the bag-rubbing roller, ensuring that the M-film insert edge is fully opened while preventing excessive stretching that could deform the M-film.

[0118] In this embodiment, the upper bag-rubbing rollers 245 and lower bag-rubbing rollers 246 on the two sets of M-film bag-opening modules 2 are arranged alternately. The second slider 2421 is moved so that it slides up and down in the slide rail 247, so that the upper bag-rubbing rollers 245 and lower bag-rubbing rollers 246 on the left side squeeze the upper bag-rubbing roller 245 on the right side, and the upper bag-rubbing rollers 245 and lower bag-rubbing rollers 246 on the right side squeeze the lower bag-rubbing roller 246 on the left side. After adjusting it to a suitable height, the position is fixed. The fixing method adopts a conventional structure in the art and does not involve innovation, so it will not be described in detail.

[0119] In this embodiment, the bottom of the first bag opening and retraction cylinder 21 is provided with a first base plate 211, and the bottom of the first base plate 211 is provided with a third slider 2111 that is slidably connected to the slide block 1 and can move along it.

[0120] In this embodiment, the bag-opening cylinder 3 is arranged parallel to the slide block 1, and the first base plate 211 is connected to the moving end of the bag-opening cylinder 3.

[0121] In this embodiment, the second connecting base 241 is located at the bottom of the second bag opening and bag opening retraction cylinder 22 and the bag rubbing cylinder 242. The bottom of the second connecting base 241 is provided with a fifth slider 2211 that is slidably connected to the slide block 1 and can move along it.

[0122] In this embodiment, the working principle of the M-film opening mechanism is as follows:

[0123] When opening the M-film, two M-film opening mechanisms are used, respectively positioned on both sides of the M-film, resulting in a total of four M-film opening modules 2, enabling opening at the four corners of the M-film. Initially, there is a certain distance between the two M-film opening modules 2, and the M-film is placed between the two M-film opening modules 2.

[0124] Simultaneously, the opening cylinders 3, each connected to one of the two sets of M-film opening modules 2, are activated, causing the two sets of M-film opening modules 2 to move towards each other. This causes the bag-rubbing rollers of the bag-rubbing cylinder assembly 24 to abut against the M-film. At this time, the upper bag-rubbing rollers 245 and lower bag-rubbing rollers 246 on the two sets of M-film opening modules 2 are staggered, causing the M-film to bend in a double S-shape. The upper bag-rubbing rollers 245 and lower bag-rubbing rollers 246 on the left are in the first and third positions from top to bottom, while the upper bag-rubbing rollers 245 and lower bag-rubbing rollers 246 on the right are in the second and fourth positions from top to bottom. The second slider 2421 is moved, allowing it to slide up and down in the slide rail 247. This causes the upper bag-rubbing rollers 245 and lower bag-rubbing rollers 246 on the left to press against the upper bag-rubbing roller 245 on the right, and vice versa. After adjusting to a suitable height, the positions are fixed.

[0125] Start the bag-opening cylinder 3, which is connected to the two sets of M film bag-opening modules 2 respectively, so that the two sets of M film bag-opening modules 2 move in opposite directions at the same time. At the same time as the bag-opening cylinder 3 starts, the bag-rubbing cylinder 242 of the two sets of M film bag-opening modules 2 is started, so that the upper clamping plate 243 moves downward, and the upper bag-rubbing wheel 245 and the lower bag-rubbing wheel 246 clamp the M film insertion edge and move outward, thus pulling the M film open.

[0126] The first bag-opening retraction cylinder 21 is activated, causing the bag-supporting cylinder assembly 23 to move towards each other simultaneously, thus separating the bag-supporting cylinder assembly 23 from the bag-rubbing cylinder assembly 24. At this time, the rotary cylinder 232 is activated, causing the bag-supporting rod 233 to rotate from a roughly horizontal position to a roughly vertical position and insert into the M film.

[0127] Activating the second bag-opening retraction cylinder 22 causes the first bag-opening retraction cylinder 21, the bag-supporting cylinder assembly 23, and the bag-rubbing cylinder assembly 24 of the two sets of M-film bag-opening modules 2 to move simultaneously in a direction away from each other. This causes the bag-supporting rods 233 located inside the M-film to further expand the M-film, so that the M-film is tightened by the four bag-supporting rods 233, thereby expanding the M-film and preparing it for subsequent bagging.

[0128] At this time, the bag-rubbing cylinders 242 of the two sets of M-film opening module 2 are activated simultaneously, causing the upper clamping plate 243 to move upward, releasing the M-film from the upper bag-rubbing wheel 245 and the lower bag-rubbing wheel 246. The rotating cylinder 232 is activated, causing the bag-supporting rod 233 to return to its original position, rotating from a roughly vertical position to a roughly horizontal position. Finally, the first bag-opening retraction cylinder 21 and the second bag-opening retraction cylinder 22 are moved, causing the bag-supporting cylinder assembly 23 and the bag-rubbing cylinder assembly 24 to return to their original positions, and the next round of M-film opening is performed.

[0129] Example 2

[0130] This embodiment is based on embodiment 1. The moving end of the bag-opening cylinder 3 is provided with a limiting member to restrict its maximum travel. The limiting member adopts a conventional structure in the art.

[0131] Example 3

[0132] This embodiment is based on Embodiment 1. An elastic floating mechanism is provided between the second slider 2421 and the slide rail 247, enabling the second slider 2421 to achieve adaptive floating displacement vertically. The elastic floating mechanism adopts a conventional structure in the art. For example, in this embodiment, the elastic floating mechanism includes a pressure adjustment component, which consists of a preload spring and a pressure adjustment bolt. The floating pressure range of the second slider 2421 is controlled by adjusting the preload force of the preload spring. After the second slider 2421 achieves adaptive up-and-down floating function, it can intelligently adapt to M-film packaging bags of different thicknesses and materials, solving the problem of excessive compression of ultra-thin or composite material packaging bags by traditional rigid clamping mechanisms. When processing packaging bags of different specifications, the floating mechanism automatically compensates for positional deviations, ensuring that the upper bag-rubbing wheel 245 and the lower bag-rubbing wheel 246 always contact the bag opening with optimal pressure, suitable for production scenarios where multiple packaging materials are on the same production line in a central kitchen.

[0133] Example 4

[0134] An M-film bagging auxiliary device is provided, which includes an M-film opening mechanism as described in Embodiment 1, for bagging after the M-film is opened.

[0135] Example 5

[0136] An M-film bagging auxiliary device is provided, which includes an M-film opening mechanism as described in Embodiment 2, for bagging after the M-film is opened.

[0137] Example 6

[0138] An M-film bagging auxiliary device is provided, wherein the bagging auxiliary device includes an M-film opening mechanism as described in Embodiment 3, for bagging after the M-film is opened.

[0139] The above description of the embodiments is provided to enable those skilled in the art to understand and use the utility model. It will be apparent to those skilled in the art that various modifications can be easily made to these embodiments, and the general principles described herein can be applied to other embodiments without inventive effort. Therefore, the present utility model is not limited to the above embodiments, and any improvements and modifications made by those skilled in the art based on the disclosure of the present utility model without departing from its scope should be within the protection scope of the present utility model.

Claims

1. A film opening mechanism, characterized in that, For opening M-film bags, the M-film opening mechanism includes: Slide (1); Two sets of M-film opening modules (2) are slidably disposed on the slide (1). The two sets of M-film opening modules (2) move towards each other. Each set of M-film opening modules (2) includes a first opening retraction cylinder (21), a second opening retraction cylinder (22) connected to the moving end of the first opening retraction cylinder (21), a bag-supporting cylinder assembly (23) connected to the moving end of the second opening retraction cylinder (22) and used to open the M-film, and a bag-rubbing cylinder assembly (24) connected to the body of the second opening retraction cylinder (22) and used to rub the inserted edge of the M-film. And the bag-opening cylinder (3) that drives the M film bag-opening module (2) to move along the slide (1).

2. The M-film bag opening mechanism according to claim 1, characterized in that, The moving ends of the first bag opening retraction cylinder (21) and the second bag opening retraction cylinder (22) move along the stroke direction of the slide (1).

3. The M-film bag opening mechanism according to claim 1, characterized in that, The bag-supporting cylinder assembly (23) includes: A first connecting base (231) is connected to the moving end of the second bag opening retraction cylinder (22); A rotary cylinder (232) is mounted on the first connecting base (231); And a bag support rod (233) with one end connected to the rotating end of the rotary cylinder (232), the bag support rod (233) rotating between a first position and a second position under the drive of the rotary cylinder (232).

4. The M-film bag opening mechanism according to claim 3, characterized in that, The first position is approximately horizontal, and the second position is approximately vertical.

5. The M-film bag opening mechanism according to claim 1, characterized in that, The bag-making cylinder assembly (24) includes: A second connecting base (241) connected to the body of the second bag opening retraction cylinder (22); A bag-rubbing cylinder (242) is installed on the second connecting base (241); The two sets of clamping plates connected to the bag-rubbing cylinder (242) include an upper clamping plate (243) connected to the moving end of the bag-rubbing cylinder (242) and a lower clamping plate (244) connected to the body of the bag-rubbing cylinder (242); The bag-making wheels connected to the clamping plate include an upper bag-making wheel (245) connected to one end of the upper clamping plate (243) and a lower bag-making wheel (246) connected to one end of the lower clamping plate (244).

6. The M-film bag opening mechanism according to claim 5, characterized in that, The moving end of the bag-rubbing cylinder (242) moves in the vertical direction.

7. The M-film bag opening mechanism according to claim 5, characterized in that, The second connecting base (241) is provided with a vertically arranged slide (247), which is located on one side of the bag-making cylinder (242). One end of the upper clamping plate (243) is provided with a first slider (2431), which is slidably connected to the slide (247) and can move along it.

8. The M-film bag opening mechanism according to claim 7, characterized in that, A second slider (2421) is provided on one side of the body of the bag-making cylinder (242). The second slider (2421) is slidably connected to the slide rail (247) and can move along it.

9. The M-film bag opening mechanism according to claim 5, characterized in that, The upper bag-rubbing roller (245) and lower bag-rubbing roller (246) on the two sets of M film bag-opening modules (2) are arranged alternately.

10. An M-film bagging auxiliary device, characterized in that, The bagging auxiliary device includes an M-film bag opening mechanism as described in any one of claims 1 to 9.

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