A supermarket plastic bag processing device and method

Abstract

This invention discloses an equipment and method for processing plastic bags for supermarkets. A raw material unwinding and feeding mechanism is located on the outside of the processing frame and outside the processing box, used for automatic unwinding, guiding and correcting deviations, flattening and wrinkle removal, and stable traction feeding of rolled plastic bags. A middle transition conveyor assembly is located in the middle of the frame, between the guiding mechanism and the cutting conveyor assembly, with its front and rear ends connected to the guiding mechanism and the cutting conveyor assembly respectively, and fixedly connected to the frame, used for the transition conveying of rolled plastic bag materials. A cutting section drive assembly is located on the machine frame and used to drive the movement of the cutting conveyor mechanism. This invention features a conveyor belt that does not sag during long-term operation, smooth and stable film conveying, reduced blade wear speed, flexible adjustment of the cutting position, and adaptability to the processing needs of plastic bags with different film widths and sizes. The equipment has greater versatility, reduces manual intervention, and significantly improves production efficiency.

Description

Technical Field

[0001] This invention relates to the field of plastic packaging product processing equipment technology, and more specifically, to a device and method for processing plastic bags for supermarkets. Background Technology

[0002] In the field of plastic packaging product processing, supermarket plastic bags are frequently used packaging materials, and the performance of their automated processing equipment directly affects production efficiency and finished product quality. Rolls of plastic film require a cutting process to divide the continuous film material into individual standard-sized bags, forming complete bag openings and bottom boundaries, enabling automated material output and multi-size adaptation. Cutting is a key process in plastic bag forming. Currently, traditional plastic bag processing equipment on the market generally suffers from technical problems such as poor feeding stability, susceptibility to film defects, low cutting accuracy, and weak adjustability. These problems specifically include the following aspects: 1. Traditional equipment lacks a complete guiding, correction, flattening and wrinkle removal structure in its unwinding and feeding mechanism. During the unwinding process, the rolled plastic film is prone to lateral movement and deviation. At the same time, the inherent defects of the film, such as wrinkles, curled edges and overlapping, cannot be effectively eliminated, resulting in feeding slippage and unstable conveying gaps. The finished plastic bags processed later are prone to size deviations and irregular edges.

[0003] 2. The material guiding mechanism and the intermediate transition conveyor components of the equipment mostly adopt independent drive mode, which has poor transmission synchronization and is prone to problems such as mismatch of film material conveying speed and intermittent material supply; in addition, the tension of the conveyor belt is inconvenient to adjust and is prone to loosening after long-term operation, making it impossible to achieve stable and uniform film conveying, which affects the continuity of subsequent cutting processes.

[0004] 3. Traditional cutting devices lack precise limiters for the downward stroke of the blade and have no buffer structure for cutting pressure, which easily leads to problems such as incomplete cuts, off-center cuts, and rapid blade wear. At the same time, the cutting position is fixed, and it is impossible to flexibly adjust the cutting position laterally according to the size requirements of different plastic bags. The equipment has a weak ability to adapt to plastic bags of different film widths and sizes.

[0005] 4. The existing equipment does not integrate the processes of unwinding, guiding and conveying, and precision cutting. The connection between each link is not smooth, there is a lot of manual intervention, and the production efficiency is low. It cannot meet the needs of supermarkets for large-scale, standardized and high-efficiency production of plastic bags. Summary of the Invention

[0006] To achieve the above objectives, the present invention provides a processing equipment for processing plastic bags for supermarkets, including a processing frame and a processing box disposed on the processing frame; The raw material unwinding and feeding mechanism is located on the outside of the processing frame and outside the processing box. It is used to realize automatic unwinding, guiding and correcting, flattening and wrinkle removal, and stable traction feeding of rolled plastic bags. The material guiding mechanism is located in the front half of the processing frame and is fixedly connected to the processing frame. The rear end is connected to the middle transition conveyor assembly for feeding and conveying rolled plastic bags, and smoothly and evenly conveying the bags to be processed to the next process. The middle transition conveyor assembly is located in the middle of the frame, between the material guiding mechanism and the cutting conveyor assembly. Its front and rear ends are connected to the material guiding mechanism and the cutting conveyor assembly respectively, and it is also fixedly connected to the frame. It is used for the transition conveying of rolled plastic bag materials. The conveyor section drive assembly is mounted on the processing frame and is used to simultaneously drive the material guiding mechanism and the intermediate transition conveyor assembly. The cutting and conveying mechanism is located in the rear half of the processing frame, passes through the cutting mechanism, and is used to transport plastic bags to the cutting mechanism for cutting, and to transport the cut individual plastic bags to the next process. The cutting mechanism, located in the rear half of the processing frame and above the cutting and conveying mechanism, is used to cut rolls of plastic bags. The cutting section drive assembly, mounted on the machine frame, is used to drive the movement of the cutting conveyor mechanism.

[0007] Furthermore, the raw material unwinding and feeding mechanism includes a feeding rack connected to the processing frame: The top unwinding spindle is located at the very top of the feeding rack and is rotatably connected to the feeding rack bearing. It is used to mount and fix the plastic film raw material roll and realize the initial unwinding and discharge of the film roll. The upper transition guide roller is rotatably set in the upper half of the feeding rack and located behind the top unwinding main shaft. It is used to receive the film released from the top unwinding main shaft and complete the material path guidance and initial stretching and leveling of the film. The lower transition guide roller is rotatably mounted on the upper half of the feeding frame and located behind the upper transition guide roller. It is used to receive the film released from the upper transition guide roller and complete the material path guidance. The width limit adjustment frame is rotatably set in the upper half of the feeding frame and located diagonally above the lower transition guide roller. It is used to adjust the lateral limit spacing according to the width of the raw material film, and to limit the lateral movement and deviation of the film material. The spiral unwinding roller, which is rotated and located in the middle of the feeding frame, is used to eliminate wrinkles, curling edges, and lamination defects inherent in roll films. The downward driven clamping roller is located below the spiral spreading roller and is rotatably connected to the feeding frame. It is used for the movable connection of the frame swing linkage and tension adjustment component, and is used to clamp the film against the upper active conveying roller to prevent slippage during feeding and stabilize the conveying gap.

[0008] The unwinding drive motor is located on the outside of the feeding frame, and its output end is connected to the spiral unwinding roller to drive the spiral unwinding roller to rotate. The middle auxiliary guide roller is rotatably set in the middle section of the feeding frame to connect the traction discharge path, smoothly transition the film conveying direction, and secondary comb and smooth the film material. The upper auxiliary guide roller, located diagonally above the middle auxiliary guide roller, is rotatably connected to the feeding frame and is used to assist in adjusting the film conveying direction, optimize the material transmission path, and ensure smooth and unobstructed material flow. The bottom discharge guide roller is located below the upper auxiliary guide roller and is rotatably connected to the feeding frame. It is used to straighten the final discharge path and smoothly transport the flat and stable film to the subsequent middle section folding and shaping station of the equipment.

[0009] Furthermore, a first weight-reducing hole is provided on the spiral stretching roller, and a spiral pattern is provided on the outer surface of the spiral stretching roller. The spiral pattern extends along the length of the spiral stretching roller and is used to stretch the film material to both sides. The width limiting adjustment frame includes a positioning rod, both ends of which are connected to the feeding frame, and two adjustment components are sleeved on the positioning rod; The adjustment assembly includes an adjustment seat, an adjustment rod on the adjustment seat, the inner side of the adjustment rod being flush with the inner side of the adjustment seat, and a locking pin on the adjustment seat for positioning the adjustment seat.

[0010] Furthermore, the material guiding mechanism includes a material guiding spindle and a material guiding driven shaft rotatably mounted on the processing frame. The material guiding spindle and the material guiding driven shaft are connected by a material guiding conveyor belt, and the material guiding spindle is driven to rotate by a conveyor section drive assembly. The processing frame is equipped with a first guide tension adjusting roller and a second guide tension adjusting roller, which are used to adjust the tension of the guide conveyor belt.

[0011] Furthermore, the intermediate transition conveying assembly includes a transition frame mounted on the frame, on which a transition main shaft and a transition driven shaft are mounted, and a transition belt is wound around the transition main shaft and the transition driven shaft. The transition main shaft is driven to rotate by the conveying section drive assembly.

[0012] Furthermore, the conveying section drive assembly includes a conveying motor mounted on the processing frame, a material guiding drive assembly and a transition drive assembly respectively mounted on both sides of the conveying motor, and a material guiding drive wheel and a transition drive wheel mounted at the output end of the conveying motor; The material guiding drive assembly includes a material guiding transmission roller mounted on the processing frame. The input end of the material guiding transmission roller is connected to the material guiding drive wheel via a first material guiding transmission belt. A second material guiding transmission belt is simultaneously wound around the first, second, and third material guiding driven wheels. The first material guiding driven wheel is mounted on the output end of the material guiding transmission roller. The second material guiding driven wheel is located in the lower half of the processing frame. The third material guiding driven wheel is located above the first and second material guiding driven wheels and is rotatably connected to the processing frame via a material guiding rotation shaft. A fourth material guiding driven wheel is sleeved on the material guiding rotation shaft. The fourth material guiding driven wheel is connected to a fifth material guiding driven wheel sleeved on the material guiding main shaft via the third material guiding transmission belt. A material guiding adjustment arm is adjustablely mounted on the processing frame. A sixth material guiding driven wheel is provided on the material guiding adjustment arm for adjusting the tension of the third material guiding transmission belt. The transition drive assembly includes a transition drive roller mounted on the machining frame. The input end of the transition drive roller is connected to the transition drive wheel via a first transition drive belt. A second transition drive belt is wound around the first, second, and third transition driven wheels. The first transition driven wheel is located in the lower half of the machining frame and is mounted on the output end of the transition drive roller. The second transition driven wheel is located in the upper half of the machining frame. The third transition driven wheel is located diagonally above the second transition driven wheel and is rotatably connected to the machining frame via a transition rotating shaft. A fourth transition driven wheel is mounted on the transition rotating shaft. The fourth transition driven wheel is connected to a fifth transition driven wheel mounted on the transition spindle via the third transition drive belt. A transition swing arm is adjustablely mounted on the machining frame. A sixth transition driven wheel is mounted on the transition swing arm for adjusting the tension of the third transition drive belt.

[0013] Furthermore, the cutting conveying mechanism includes a cutting conveying frame, on which a transmission component is provided. The transmission component includes a first transmission roller, a second transmission roller, and a cutting transmission cylinder located at the output section of the cutting conveying frame and arranged from top to bottom. Two third transmission rollers are provided in the upper half of the middle section of the cutting conveying frame, and two fourth transmission rollers are provided in the lower half. A fifth transmission roller, a sixth transmission roller, and a seventh transmission roller are arranged sequentially from top to bottom in the input section of the cutting conveying frame. The cutting conveyor belt is wound around the conveying assembly. The cutting section drive assembly includes a cutting conveyor motor mounted on the cutting conveyor frame. The output end of the cutting conveyor motor is connected to the first cutting wheel and the second cutting wheel through the cutting conveyor belt. The second cutting wheel is connected to the cutting conveyor cylinder. The first cutting wheel is rotatably connected to the cutting conveyor frame. The front and rear halves of the cutting conveyor are equipped with support plates for stabilizing the cutting conveyor belt. Between the two third conveyor rollers is a cutting mounting seat connected to the cutting mechanism. The cutting mounting seat has a replaceable cutting table, and the cutting mechanism is located directly above the cutting table.

[0014] Furthermore, it also includes a lateral adjustment mechanism, which includes two guide rails set on the cutting conveyor frame. A slide is set on the guide rail, and the slide is driven by a drive cylinder to move along the length of the guide rail. A mounting plate is set on the slide, and the two sides of the cutting mechanism are supported by the mounting plates respectively. The cutting mechanism and the cutting mounting base move with the mounting plates.

[0015] Furthermore, the cutting mechanism includes a cutting frame, with its two sides respectively mounted on mounting plates. Several columns are installed inside the cutting frame, with the upper end of each column connected to the top of the cutting frame and the lower end connected to the mounting plate. Each column is connected to both sides of a positioning seat. Two cutting cylinders are installed on the positioning seat, with the upper half of each cylinder movably passing through the top of the cutting frame. The output end of each cutting cylinder is simultaneously connected to the upper end of a tool holder. The lower section of the tool holder is connected to a tool post via several guide rods. Several second weight-reducing holes are provided on the tool post. A tool body that mates with the cutting table surface is installed at the lower end of the tool post. The upper end of the tool post is connected to the tool post via several springs. Each spring is sleeved on a telescopic rod, and both ends of each telescopic rod are connected to the tool post and the tool post, respectively. When cutting downwards, the telescopic rods extend and retract. The positioning seat is equipped with two first limiting members, each including a limiting rod. Each limiting rod has a limiting head, which is used to limit the tool holder and has a telescopic spring-back function. There is a height threaded adjustment rod between each limiting rod. The lower end of the height threaded adjustment rod is rotatably connected to the positioning seat, and the upper end is threadedly connected to the top of the cutting frame and locked by a lock nut. Second limiting members with the same structure as the first limiting members are provided on both sides of the tool holder. The cutter holder is equipped with a stroke limiting component, which includes a fixed rod connected to the cutter holder, a limiting plate on the fixed rod, a limiting inclined surface at the lower end of the limiting plate, and a limiting wheel and a stroke sensing limiting sensor that cooperate with the limiting inclined surface on the cutting frame.

[0016] A method for processing plastic bags for supermarkets includes the following steps: The rolled plastic film raw material is placed on the top unwinding main shaft of the raw material unwinding and feeding mechanism. The unwinding drive motor drives the spiral spreading roller to rotate. The film is released from the top unwinding main shaft and passes through the upper transition guide roller and the lower transition guide roller in sequence to complete the initial guidance and leveling. The width limit adjustment frame adjusts the lateral limit according to the film width to prevent the film from moving left and right. The film enters between the spiral spreading roller and the lower pressure driven clamping roller and is clamped and conveyed. The spiral pattern on the surface of the spiral spreading roller spreads the film to both sides to eliminate wrinkles, curling and stacking defects. After being combed by the middle auxiliary guide roller, the upper auxiliary guide roller and the bottom discharge guide roller, it is sent into the guiding mechanism. The conveyor motor of the conveying section drive assembly synchronously drives the material guiding drive assembly and the transition drive assembly. The material guiding main shaft drives the material guiding conveyor belt to rotate. The first material guiding tension adjusting roller and the second material guiding tension adjusting roller adjust the tension of the material guiding conveyor belt. The film material is uniformly conveyed backward by the material guiding conveyor belt to the middle transition conveying assembly. The transition main shaft drives the transition belt to rotate, receiving the film material to complete the transition conveying and continuously feeding the material to the cutting conveying mechanism. The cutting transmission motor of the cutting section drive assembly drives the cutting transmission cylinder to rotate via the cutting transmission belt, which in turn drives the cutting transmission belt to operate. The support plate supports the cutting transmission belt to maintain stability. The film material passes through the cutting table below the cutting mechanism along with the cutting transmission belt. The cutting cylinder pushes the blade holder downward. The blade holder drives the blade holder and blade body to move downward via the guide rod. The spring and telescopic rod buffer the cutting pressure. The limit rod, height threaded adjustment rod and stroke sensing limit sensor work together to limit the downward stroke of the blade holder. The blade body and the cutting table work together to complete the cutting of the film material. A single plastic bag is transported to the next process along the cutting transmission belt. When the cutting position needs to be adjusted, the drive cylinder of the lateral adjustment mechanism drives the slide to move along the guide rail. The mounting plate synchronously drives the cutting mechanism and the cutting mounting seat to move laterally.

[0017] The present invention has the following beneficial effects: 1. This solution adopts an integrated unwinding and feeding scheme that combines multi-layer guide rollers, a width limiting and adjusting structure, a spiral spreading roller, and a clamping and holding conveyor. The multi-layer guide rollers guide and level the film, the width limiting and adjusting structure restricts the lateral movement and deviation of the film, the spiral spreading roller eliminates wrinkles, curling, and stacking of the film, and the clamping and holding structure prevents slippage during feeding and stabilizes the conveying gap. It can realize automatic unwinding of rolled film, precise correction, full flattening and wrinkle removal, and stable traction feeding, eliminating film defects and ensuring that the plastic bags processed laterally are accurate in size and have neat edges.

[0018] 2. This invention adopts a single motor synchronous drive, dual-path transmission components, and a conveyor belt tension adjustment structure. The same conveyor motor synchronously drives the material guiding mechanism and the middle transition conveyor component to ensure that the two conveying speeds are completely consistent. With the adjustable conveyor belt tension structure, the conveyor belt tension is maintained stably. This achieves synchronous and uniform speed and uninterrupted material supply throughout the material guiding and transition conveying process. The conveyor belt does not loosen during long-term operation, and the film conveying is smooth and stable.

[0019] 3. This invention adopts a cutting structure with multi-stage stroke limiting, elastic buffer cutting, and a laterally adjustable cutting station. Through mechanical limiting, height adjustment, and sensor sensing triple limiting, the downward stroke of the blade is precisely controlled. Springs and telescopic rods buffer the cutting pressure, and the lateral adjustment mechanism drives the cutting mechanism to move synchronously with the cutting table. The cutting action is precise and stable, avoiding problems such as incomplete cutting and off-center cutting, reducing the wear rate of the blade, and allowing for flexible adjustment of the cutting position to adapt to the processing needs of plastic bags with different film widths and sizes, making the equipment more versatile.

[0020] 4. This invention integrates the unwinding, guiding, transitioning, and precision cutting processes into a single device. The various mechanisms are interconnected and operate automatically, requiring minimal manual intervention throughout the entire process. This achieves fully automated and integrated operation of the plastic bag processing process, with smooth connections between each stage, reduced manual involvement, and significantly improved production efficiency, meeting the needs of supermarkets for large-volume, standardized, and high-efficiency production of plastic bags. Attached Figure Description

[0021] Figure 1 This is a structural schematic diagram of a specific embodiment of the present invention.

[0022] Figure 2 This is a top view of the structure of the present invention.

[0023] Figure 3 This is a three-dimensional structural diagram of the raw material unwinding and feeding mechanism in this invention.

[0024] Figure 4 This is a schematic diagram of the structure of the components used in this invention, including the top unwinding spindle, the upper transition guide roller, the spiral stretching roller, and the bottom discharge guide roller.

[0025] Figure 5 This is a schematic diagram of the design structure of the spiral spreading roller in this invention.

[0026] Figure 6 This is a schematic diagram of the width limiting adjustment frame in this invention.

[0027] Figure 7 This is a schematic diagram of the material guiding mechanism in this invention.

[0028] Figure 8 This is a schematic diagram of the structure in which the material guide conveyor belt, the material guide spindle, the third material guide transmission belt, and the fifth material guide driven wheel are used in conjunction with other components in this invention.

[0029] Figure 9 This is a schematic diagram of the structure in which components such as transition belts and transition frames are used in conjunction in this invention.

[0030] Figure 10 This is a schematic diagram of the structure of the conveyor section drive assembly in this invention.

[0031] Figure 11 This is a schematic diagram of the structure in which the second material guide belt, the material guide rotating shaft, the fourth material guide driven wheel, and other components work together in this invention.

[0032] Figure 12 This is a schematic diagram of the structure in which the conveying motor, the guide roller, the transition roller, and other components are used together in this invention.

[0033] Figure 13This is a schematic diagram of the structure in which the second transition transmission belt, transition rotation shaft, transition swing arm and other components are used in conjunction in this invention.

[0034] Figure 14 This is a schematic diagram of the cutting and conveying mechanism in this invention.

[0035] Figure 15 This is a schematic diagram of the structure in this invention, showing the connection between the support plate and components such as the first transmission roller, the cutting transmission cylinder, and the seventh transmission roller.

[0036] Figure 16 This is a schematic diagram of the connection structure of the first cutting wheel, the cutting transmission belt, the second cutting wheel, and other components in this invention.

[0037] Figure 17 This is a schematic diagram of the cutting mechanism in this invention.

[0038] Figure 18 This is a schematic diagram of the connection structure of components such as the cutting frame and the height threaded adjustment rod in this invention.

[0039] Figure 19 This is a structural schematic diagram of the components such as the cutting frame, height threaded adjustment rod, cutting cylinder, and tool holder in this invention.

[0040] Figure 20 This is a schematic diagram of the connection structure of components such as the tool holder, fixing rod, and height threaded adjustment rod in this invention.

[0041] Figure 21 This is a schematic diagram of the structure of the limiting plate, the limiting wheel, and the stroke sensing limiting sensor in this invention.

[0042] Figure 22 This is a structural diagram of components such as the material guiding mechanism and the intermediate transition conveying assembly.

[0043] Figure 23 This is a schematic diagram of the structure of components such as the conveyor section drive assembly and the cutting mechanism in this invention. Detailed Implementation

[0044] The present invention will be further described below with reference to the accompanying drawings and embodiments: In the description of this invention, it should be noted that the terms "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," 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 the invention 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 the invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0045] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "setting," and "connection" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0046] like Figures 1 to 23 As shown, a processing equipment for processing plastic bags for supermarkets includes a processing frame 1, on which a processing box 2 is provided; The raw material unwinding and feeding mechanism 100 is set outside the processing frame 1 and outside the processing box 2. It is used to realize automatic unwinding of rolled plastic bags, guiding and correcting deviation, flattening and wrinkle removal, and stable traction feeding. The material guiding mechanism 200 is set in the front half of the processing frame 1 and is fixedly connected to the processing frame 1. The rear end is connected to the middle transition conveying component 300, which is used for feeding and conveying rolled plastic bags, and smoothly and evenly conveying the bags to be processed to the next process. The middle transition conveying assembly 300 is located in the middle of the frame 1, between the material guiding mechanism 200 and the cutting conveying mechanism 800. Its front and rear ends are connected to the material guiding mechanism 200 and the cutting conveying mechanism 800 respectively, and it is also fixedly connected to the frame. It is used for the transition conveying of rolled plastic bag materials. The conveyor section drive assembly 500 is mounted on the processing frame 1 and is used to simultaneously drive the material guiding mechanism 200 and the intermediate transition conveyor assembly 300 to move. The cutting and conveying mechanism 800 is located in the rear half of the processing frame 1, passes through the cutting mechanism 600, and is used to transport plastic bags to the cutting mechanism 600 for cutting, and to transport the cut plastic bags to the next process. The cutting mechanism 600 is located in the rear half of the processing frame 1, above the cutting and conveying mechanism 800, and is used to cut rolls of plastic bags. The cutting segment drive assembly 700 is mounted on the machine frame 1 and is used to drive the cutting conveyor mechanism 800 to move.

[0047] The raw material unwinding and feeding mechanism 100 includes a feeding rack 101 connected to the processing frame 1: The top unwinding spindle 102 is located at the top of the feeding rack 101 and is rotatably connected to the bearing of the feeding rack 101. It is used to fix the plastic film raw material roll and realize the initial unwinding and discharge of the film roll. The upper transition guide roller 103 is rotatably set in the upper half of the feeding rack 101 and located behind the top unwinding main shaft 102. It is used to receive the film released from the top unwinding main shaft 102 and complete the material path guidance and the initial stretching and leveling of the film. The lower transition guide roller 105 is rotatably mounted on the upper half of the feeding frame 101 and located behind the upper transition guide roller 103. It is used to receive the film released from the upper transition guide roller 103 and complete the material path guidance. Width limit adjustment frame 106 is rotatably set in the upper half of the feeding frame 101 and located diagonally above the lower transition guide roller 105. It is used to adjust the lateral limit spacing according to the width of the raw material film to limit the film material from moving laterally to the left and right and from deviating. The spiral stretching roller 107 is rotatably set in the middle section of the feeding frame 101 to eliminate wrinkles, curling edges, and lamination defects inherent in the roll film. The downward driven pressing roller 108 is located below the spiral spreading roller 107 and is rotatably connected to the feeding frame 101. It is used for the movable connection of the frame swing linkage and tension adjustment component, and is used to press and clamp the film with the upper active conveying roller to prevent feeding slippage and stabilize the conveying gap.

[0048] The unwinding drive motor 132 is located on the outside of the feeder 101, and its output end is connected to the spiral unwinding roller 107 to drive the spiral unwinding roller 107 to rotate. The middle auxiliary guide roller 109 is rotatably set in the middle section of the feeding frame 101 to connect the traction discharge path, smoothly transition the film conveying direction, and secondary comb and smooth the film material. The upper auxiliary guide roller 130 is located diagonally above the middle auxiliary guide roller 109 and is rotatably connected to the feeding frame 101. It is used to assist in adjusting the film conveying direction, optimize the material transmission path, and ensure that the material flows smoothly without jamming. The bottom discharge guide roller 131 is located below the upper auxiliary guide roller 130 and is rotatably connected to the feeding frame 101. It is used to straighten the final discharge path and smoothly transport the flat and stable film to the subsequent middle section folding and shaping station of the equipment.

[0049] The spiral stretching roller 107 has a weight reduction hole 609133 and a roller surface spiral pattern 135 on its outer surface. The roller surface spiral pattern 135 extends along the length direction of the spiral stretching roller 107 and is used to stretch the film material to both sides. The width limiting adjustment frame 106 includes a positioning rod 136, both ends of which are connected to the feeding frame 101. Two adjustment components 137 are sleeved on the positioning rod 136. The adjustment assembly 137 includes an adjustment seat 138, an adjustment rod 139 is provided on the adjustment seat 138, the inner side of the adjustment rod 139 is flush with the inner side of the adjustment seat 138, and a locking pin 150 is provided on the adjustment seat 138 for positioning the adjustment seat 138.

[0050] The material guiding mechanism 200 includes a material guiding spindle 201 and a material guiding driven shaft 202 rotatably mounted on the processing frame 1. The material guiding spindle 201 and the material guiding driven shaft 202 are connected by a material guiding conveyor belt 203. The material guiding spindle 201 is driven to rotate by a conveying section drive assembly 500. The processing frame 1 is equipped with a first guide tension adjusting roller 206 and a second guide tension adjusting roller 207, which are used to adjust the tension of the guide conveyor belt 203.

[0051] The intermediate transition conveying assembly 300 includes a transition frame 301 mounted on the frame 1. The transition frame 301 is provided with a transition main shaft and a transition driven shaft. The transition belt 302 is wound around the transition main shaft and the transition driven shaft. The transition main shaft is driven to rotate by the conveying section drive assembly 500.

[0052] The conveying section drive assembly 500 includes a conveying motor 501 mounted on the processing frame 1. A material guiding drive assembly 502 and a transition drive assembly 503 are respectively mounted on both sides of the conveying motor 501. A material guiding drive wheel 505 and a transition drive wheel 506 are mounted on the output end of the conveying motor 501. The material guiding drive assembly 502 includes a material guiding drive roller 507 mounted on the processing frame 1. The input end of the material guiding drive roller 507 is connected to the material guiding drive wheel 505 via a first material guiding drive belt 508. A second material guiding drive belt 509 is wound around a first material guiding driven wheel 510, a second material guiding driven wheel 511, and a third material guiding driven wheel 512. The first material guiding driven wheel 510 is mounted on the output end of the material guiding drive roller 507. The second material guiding driven wheel 511 is located in the lower half of the processing frame 1, and the third material guiding driven wheel 512 is located at the first... Above the second guide wheel 510 and the second guide wheel 511, and rotatably connected to the processing frame 1 via the guide rotating shaft 513, the guide rotating shaft 513 is fitted with a fourth guide wheel 515, the fourth guide wheel 515 is connected to a fifth guide wheel 517 fitted on the guide main shaft 201 via a third guide transmission belt 516, the guide adjusting arm 518 is adjustablely mounted on the processing frame 1, and the guide adjusting arm 518 is provided with a sixth guide wheel 519 for adjusting the tension of the third guide transmission belt 516; The transition drive assembly 503 includes a transition drive roller 520 mounted on the machining frame 1. The input end of the transition drive roller 520 is connected to the transition drive pulley 506 via a first transition drive belt 521. A second transition drive belt 522 is wound around a first transition driven pulley 523, a second transition driven pulley 525, and a third transition driven pulley 526. The first transition driven pulley 523 is located in the lower half of the machining frame 1 and is mounted on the output end of the transition drive roller 520. The second transition driven pulley 525 is located in the upper half of the machining frame 1. The third transition driven wheel 526 is located diagonally above the second transition driven wheel 525 and is rotatably connected to the processing frame 1 via the transition rotating shaft 527. The fourth transition driven wheel 528 is sleeved on the transition rotating shaft 527. The fourth transition driven wheel 528 is connected to the fifth transition driven wheel 530 sleeved on the transition spindle via the third transition transmission belt 529. The transition swing arm 531 is adjustablely mounted on the processing frame 1. The transition swing arm 531 is equipped with a sixth transition driven wheel 532 for adjusting the tension of the third transition transmission belt 529.

[0053] The cutting conveying mechanism 800 includes a cutting conveying frame 801, on which a transmission component is provided. The transmission component includes a first transmission roller 802, a second transmission roller 803 and a cutting transmission cylinder 805 located at the output section of the cutting conveying frame 801 and arranged from top to bottom. Two third transmission rollers 806 are provided in the upper half of the middle section of the cutting conveying frame 801, and two fourth transmission rollers 807 are provided in the lower half. A fifth transmission roller 808, a sixth transmission roller 809 and a seventh transmission roller 810 are arranged from top to bottom in the input section of the cutting conveying frame 801. The cutting conveyor belt 811 is wound around the conveying assembly. The cutting section drive assembly 700 includes a cutting conveyor motor 812 mounted on the cutting conveyor frame 801. The output end of the cutting conveyor motor 812 is connected to the first cutting wheel 815 and the second cutting wheel 816 via the cutting transmission belt 813. The second cutting wheel 816 is connected to the cutting conveyor cylinder 805. The first cutting wheel 815 is rotatably connected to the cutting conveyor frame 801. The front and rear halves of the cutting conveyor frame 801 are provided with support plates 817 for stabilizing the cutting conveyor belt 811. Between the two third conveyor rollers 806, there is a cutting mounting seat 818 connected to the cutting mechanism 600. The cutting mounting seat 818 has a replaceable cutting table 819, and the cutting mechanism 600 is located directly above the cutting table 819.

[0054] It also includes a lateral adjustment mechanism 900, which includes two guide rails 901 mounted on the cutting conveyor frame 801. A slide block 902 is mounted on the guide rail 901. The slide block 902 is driven by a drive cylinder to move along the length of the guide rail 901. A mounting plate 903 is mounted on the slide block 902. The two sides of the cutting mechanism 600 are supported by the mounting plates 903 respectively. The cutting mechanism 600 and the cutting mounting base 818 move with the mounting plates 903.

[0055] The cutting mechanism 600 includes a cutting frame 601, with its two sides respectively mounted on mounting plates 903. Several columns 602 are installed inside the cutting frame 601. The upper end of each column 602 is connected to the top of the cutting frame 601, and the lower end of each column 602 is connected to the mounting plate 903. Each column 602 is connected to both sides of a positioning seat 603. Two cutting cylinders 605 are installed on the positioning seat 603. The upper half of each cutting cylinder 605 is movably inserted through the top of the cutting frame 601. The output end of each cutting cylinder 605 simultaneously... The upper end of the tool holder 606 is connected to the lower section of the tool holder 606 via several guide rods 607. Several weight-reducing holes 609 are provided on the tool holder 608. The lower end of the tool holder 608 is provided with a tool body 610 that works with the cutting table 819. The upper end of the tool holder 608 is connected to the tool holder 606 via several springs 611. Each spring 611 is respectively sleeved on each telescopic rod 612. The two ends of each telescopic rod 612 are respectively connected to the tool holder 608 and the tool holder 606. When cutting downwards, the telescopic rod 612 will extend and retract. The positioning base 603 is provided with two first limiting members, each including a limiting rod 613. Each limiting rod 613 has a limiting head 615, which is used to limit the cutter holder 606 and has a telescopic spring-back function. There is a height threaded adjustment rod 616 between each limiting rod 613. The lower end of the height threaded adjustment rod 616 is rotatably connected to the positioning base 603, and the upper end is threadedly connected to the top of the cutting frame 601 and locked by a locking nut 680. The cutter holder 606 is provided with second limiting members 617 on both sides, which have the same structure as the first limiting members. The tool holder 606 is provided with a stroke limiting component, which includes a fixed rod 618 connected to the tool holder 606, a limiting plate 619 on the fixed rod 618, and a limiting inclined surface 620 at the lower end of the limiting plate 619. The cutting frame 601 is provided with a limiting wheel 621 that cooperates with the limiting inclined surface 620 and a stroke sensing limiting sensor 622.

[0056] A method for processing plastic bags for supermarkets includes the following steps: The roll of plastic film raw material is mounted on the top unwinding spindle 102 of the raw material unwinding and feeding mechanism 100. The unwinding drive motor 132 drives the spiral spreading roller 107 to rotate. The film is released from the top unwinding spindle 102 and passes through the upper transition guide roller 103 and the lower transition guide roller 105 in sequence to complete the initial guidance and leveling. The width limit adjustment frame 106 adjusts the lateral limit according to the film width to prevent the film from moving left and right. The film enters the spiral spreading roller 107 and the lower pressure driven pressing roller 108 and is clamped and conveyed. The spiral texture 135 on the surface of the spiral spreading roller 107 spreads the film to both sides to eliminate wrinkles, curling and stacking defects. After being combed by the middle auxiliary guide roller 109, the upper auxiliary guide roller 130 and the bottom discharge guide roller 131, it is sent into the guiding mechanism 200. The conveying motor 501 of the conveying section drive assembly 500 synchronously drives the material guiding drive assembly 502 and the transition drive assembly 503. The material guiding main shaft 201 drives the material guiding conveyor belt 203 to rotate. The first material guiding tension adjusting roller 206 and the second material guiding tension adjusting roller 207 adjust the tension of the material guiding conveyor belt 203. The film material is uniformly conveyed backward from the material guiding conveyor belt 203 to the middle transition conveying assembly 300. The transition main shaft drives the transition belt 302 to rotate, receiving the film material to complete the transition conveying and continuously feeding the material to the cutting conveying mechanism 800. The cutting transmission motor 812 of the cutting section drive assembly 700 drives the cutting transmission cylinder 805 to rotate via the cutting transmission belt 813, thereby driving the cutting transmission belt 811 to operate. The support plate 817 supports the cutting transmission belt 811 to maintain stability. The film material passes through the cutting table 819 below the cutting mechanism 600 along with the cutting transmission belt 811. The cutting cylinder 605 pushes the blade holder 606 to move downward. The blade holder 606 drives the blade holder 608 and the blade body 610 to move downward via the guide rod 607. The spring 611 and the telescopic rod 6 12. Buffer cutting pressure, limit rod 613, height threaded adjustment rod 616 and stroke sensing limit sensor 622 cooperate to limit the downward stroke of knife holder 606, knife body 610 cooperates with cutting table 819 to complete film material cutting, and a single plastic bag is transported to the next process by cutting conveyor belt 811; when the cutting position needs to be adjusted, the drive cylinder of the lateral adjustment mechanism 900 drives the slide 902 to move along the guide rail 901, and the mounting plate 903 synchronously drives the cutting mechanism 600 and the cutting mounting seat 818 to move laterally.

[0057] The supermarket plastic bag processing equipment and processing method provided by this invention, through modular structural design and parameterized adjustment mechanism, can adapt to the actual production needs of different film widths, different bag lengths, and different outputs. It can flexibly adjust the operating parameters and working modes according to the specifications of supermarket plastic bags, production site conditions and capacity requirements, and has good scene adaptability and scalability. The following are two typical implementation methods in combination with specific application scenarios.

[0058] Example 1 (Production of standard small and medium-sized supermarket shopping bags) This embodiment is applicable to the production of standard supermarket vest-style shopping bags with a width of 300mm and a length of 450mm, and is suitable for small and medium-sized production lines with a daily production capacity of 50,000 bags.

[0059] 1. Raw material unwinding and feeding mechanism 100: PE film roll with a thickness of 0.025mm is used. The top unwinding spindle 102 is set to a speed of 80r / min. The width limit adjustment frame 106 is adjusted to a limit distance of 310mm. The spiral stretching roller 107 has a linear speed of 12m / min to ensure that the film is wrinkle-free and without deviation.

[0060] 2. Conveying system: The conveying motor 501 of the conveying section drive assembly 500 has a speed of 1400 r / min, and the tension of the guide belt 203 and the transition belt 302 is adjusted to 80N to ensure uniform and synchronous conveying of the membrane material.

[0061] 3. Cutting system: The cutting cylinder 605 of the cutting mechanism 600 has a pressure of 0.4MPa, the blade 610 has a downward stroke of 15mm, and the cutting frequency is 15 times / min; the lateral adjustment mechanism 900 positions the cutting station at the center of the film material, and forms a single standard bag in one cut.

[0062] Example 2 (Production of Large-Size Thickened Supermarket Roll Bags) This embodiment is applicable to the production of thickened supermarket roll bags with a width of 450mm and a length of 600mm, and is suitable for large-scale production lines with a daily production capacity of 80,000 bags.

[0063] 1. Raw material unwinding and feeding mechanism 100: Uses thickened PE film roll with a thickness of 0.035mm. The top unwinding spindle 102 is set to a speed of 60r / min. The width limit adjustment frame 106 is adjusted to a limit distance of 460mm. The spiral stretching roller 107 has a linear speed of 10m / min, which is suitable for thick film conveying and flattening requirements.

[0064] 2. Conveying system: The conveying motor 501 of the conveying section drive assembly 500 has a speed of 1200 r / min, and the tension of the guide belt 203 and the transition belt 302 is adjusted to 100N to avoid slippage during thick film conveying.

[0065] 3. Cutting system: The cutting cylinder 605 of the cutting mechanism 600 has a pressure of 0.6MPa, the blade 610 has a downward stroke of 20mm, and the cutting frequency is 12 times / min; the lateral adjustment mechanism 900 drives the cutting mechanism to shift to the right by 50mm to adapt to the requirements of the cut position of the continuous roll bag, ensuring that the bag edge is neat and the cut point is clear.

Claims

1. A device for processing plastic bags for supermarkets, characterized in that, Includes a processing frame (1), on which a processing box (2) is provided; The raw material unwinding and feeding mechanism (100) is located outside the processing frame (1) and outside the processing box (2), and is used to realize automatic unwinding, guiding and correcting, flattening and wrinkle removal, and stable traction feeding of rolled plastic bags; The material guiding mechanism (200) is located in the front half of the processing frame (1) and is fixedly connected to the processing frame (1). The rear end is connected to the middle transition conveying assembly (300) for feeding and conveying rolled plastic bags, and conveying the bags to be processed to the subsequent process in a stable and uniform manner. The middle transition conveying assembly (300) is located in the middle of the frame (1), between the material guiding mechanism (200) and the cutting conveying mechanism (800) group. Its front and rear ends are connected to the material guiding mechanism (200) and the cutting conveying mechanism (800) respectively, and it is fixedly connected to the frame. It is used for the transition conveying of rolled plastic bag materials. A conveyor section drive assembly (500) is mounted on the processing frame (1) and is used to simultaneously drive the material guiding mechanism (200) and the intermediate transition conveyor assembly (300) to move. The cutting conveying mechanism (800) is located in the rear half of the processing frame (1), passes through the cutting mechanism (600), and is used to convey the plastic bag to the cutting mechanism (600) for cutting, and convey the cut single plastic bag to the next process; The cutting mechanism (600) is located in the rear half of the processing frame (1), above the cutting conveying mechanism (800), and is used to cut rolls of plastic bags. A cutting segment drive assembly (700) is disposed on the reduced processing frame (1) and is used to drive the cutting conveyor mechanism (800) to move.

2. The equipment for processing supermarket plastic bags as described in claim 1, characterized in that: The raw material unwinding and feeding mechanism (100) includes a feeding rack (101) connected to the processing frame (1): The top unwinding spindle (102) is located at the topmost position of the feeding rack (101) and is rotatably connected to the bearing of the feeding rack (101). It is used to set and fix the plastic film raw material roll and realize the initial unwinding and discharge of the film roll. The upper transition guide roller (103) is rotatably set in the upper half of the feeding rack (101) and located behind the top unwinding main shaft (102). It is used to receive the film released from the top unwinding main shaft (102) and complete the material path guidance and the initial stretching and leveling of the film. The lower transition guide roller (105) is rotatably set in the upper half of the feed rack (101) and located behind the upper transition guide roller (103) to receive the film released from the upper transition guide roller (103) and complete the material path guidance. Width limiting adjustment frame (106) is rotatably set in the upper half of the feeding frame (101) and located obliquely above the lower transition guide roller (105). It is used to adjust the lateral limiting distance according to the width of the raw material film and limit the film material from moving laterally to the left and right and deviating. The spiral stretching roller (107) is rotatably set in the middle section of the feeder (101) to eliminate wrinkles, curling edges and lamination defects inherent in roll film. The downward driven pressing roller (108) is located below the spiral spreading roller (107) and is rotatably connected to the feeding frame (101). It is used for the movable connection of the frame swing linkage and the tension adjustment component, and is used to press and clamp the film with the upper active conveying roller to prevent the feeding slip and stabilize the conveying gap. An unwinding drive motor (132) is located on the outside of the feeder (101), and its output end is connected to the spiral unwinding roller (107) to drive the spiral unwinding roller (107) to rotate. The middle auxiliary guide roller (109) is rotatably set in the middle section of the feeding rack (101) to connect the traction discharge path, smoothly transition the film conveying direction, and secondarily comb and smooth the film material; The upper auxiliary guide roller (130) is located diagonally above the middle auxiliary guide roller (109) and is rotatably connected to the feeding frame (101). It is used to assist in adjusting the film conveying direction, optimize the material transmission path, and make the material flow smoothly without jamming. The bottom discharge guide roller (131) is located below the upper auxiliary guide roller (130) and is rotatably connected to the feeding frame (101). It is used to sort out the final discharge path and smoothly transport the flat and stable film to the subsequent middle section folding and shaping station of the equipment.

3. The equipment for processing plastic bags for supermarkets as described in claim 2, characterized in that: The spiral stretching roller (107) is provided with a first weight reduction hole (133), and the outer surface of the spiral stretching roller (107) is provided with a roller surface spiral pattern (135). The roller surface spiral pattern (135) extends along the length direction of the spiral stretching roller (107), and the roller surface spiral pattern (135) is used to stretch the film material to both sides. The width limiting adjustment frame (106) includes a positioning rod (136), both ends of which are connected to the feeding frame (101), and two adjustment components (137) are sleeved on the positioning rod (136). The adjustment assembly (137) includes an adjustment seat (138), on which an adjustment rod (139) is provided. The inner side of the adjustment rod (139) is flush with the inner side of the adjustment seat (138). The adjustment seat (138) is provided with a locking pin (150), which is used to position the adjustment seat (138).

4. The equipment for processing supermarket plastic bags as described in claim 3, characterized in that: The material guiding mechanism (200) includes a material guiding spindle (201) and a material guiding driven shaft (202) rotatably mounted on the processing frame (1). The material guiding spindle (201) and the material guiding driven shaft (202) are connected by a material guiding conveyor belt (203). The material guiding spindle (201) is driven to rotate by the conveying section drive assembly (500). The processing frame (1) is provided with a first guide tension adjusting roller (206) and a second guide tension adjusting roller (207) for adjusting the tension of the guide conveyor belt (203).

5. The equipment for processing supermarket plastic bags as described in claim 4, characterized in that: The intermediate transition conveying assembly (300) includes a transition frame (301) mounted on the frame (1). The transition frame (301) is provided with a transition main shaft and a transition driven shaft. A transition belt (302) is wound around the transition main shaft and the transition driven shaft. The transition main shaft is driven to rotate by the conveying section drive assembly (500).

6. The equipment for processing supermarket plastic bags as described in claim 5, characterized in that: The conveying section drive assembly (500) includes a conveying motor (501) mounted on the processing frame (1). A material guiding drive assembly (502) and a transition drive assembly (503) are respectively mounted on both sides of the conveying motor (501). A material guiding drive wheel (505) and a transition drive wheel (506) are mounted on the output end of the conveying motor (501). The material guiding drive assembly (502) includes a material guiding drive roller (507) mounted on the processing frame (1). The input end of the material guiding drive roller (507) is connected to the material guiding drive wheel (505) via a first material guiding drive belt (508). A second material guiding drive belt (509) is simultaneously wound around a first material guiding driven wheel (510), a second material guiding driven wheel (511), and a third material guiding driven wheel (512). The first material guiding driven wheel (510) is mounted on the output end of the material guiding drive roller (507). The second material guiding driven wheel (511) is located in the lower half of the processing frame (1). The third material guiding driven wheel (512) is located in the lower half of the processing frame (1). Above the first guide wheel (510) and the second guide wheel (511), and rotatably connected to the processing frame (1) via the guide rotating shaft (513), the guide rotating shaft (513) is fitted with a fourth guide wheel (515), the fourth guide wheel (515) is connected to a fifth guide wheel (517) fitted on the guide spindle (201) via a third guide transmission belt (516), the guide adjusting arm (518) is adjustablely set on the processing frame (1), and the guide adjusting arm (518) is provided with a sixth guide wheel (519) for adjusting the tension of the third guide transmission belt (516). The transition drive assembly (503) includes a transition drive roller (520) mounted on the machining frame (1). The input end of the transition drive roller (520) is connected to the transition drive wheel (506) via a first transition drive belt (521). A second transition drive belt (522) is wound around a first transition driven wheel (523), a second transition driven wheel (525), and a third transition driven wheel (526). The first transition driven wheel (523) is located in the lower half of the machining frame (1) and is mounted on the output end of the transition drive roller (520). The second transition driven wheel (525) is mounted in the upper half of the machining frame (1). The third transition driven wheel (526) is located diagonally above the second transition driven wheel (525) and is rotatably connected to the processing frame (1) via a transition rotating shaft (527). A fourth transition driven wheel (528) is sleeved on the transition rotating shaft (527). The fourth transition driven wheel (528) is connected to a fifth transition driven wheel (530) sleeved on the transition spindle via a third transition transmission belt (529). A transition swing arm (531) is adjustablely mounted on the processing frame (1). A sixth transition driven wheel (532) is mounted on the transition swing arm (531) for adjusting the tension of the third transition transmission belt (529).

7. The equipment for processing supermarket plastic bags as described in claim 6, characterized in that: The cutting conveying mechanism (800) includes a cutting conveying frame (801), on which a transmission component is provided. The transmission component includes a first transmission roller (802), a second transmission roller (803), and a cutting transmission cylinder (805) located at the output section of the cutting conveying frame (801) and arranged from top to bottom. The upper half of the middle section of the cutting conveying frame (801) is provided with two third transmission rollers (806), and the lower half is provided with two fourth transmission rollers (807). The input section of the cutting conveying frame (801) is provided with a fifth transmission roller (808), a sixth transmission roller (809), and a seventh transmission roller (810) arranged from top to bottom. A cutting conveyor belt (811) is wound around the conveying assembly. The cutting segment drive assembly (700) includes a cutting conveyor motor (812) mounted on the cutting conveyor frame (801). The output end of the cutting conveyor motor (812) is connected to a first cutting wheel (815) and a second cutting wheel (816) via a cutting transmission belt (813). The second cutting wheel (816) is connected to the cutting conveyor cylinder (805). The first cutting wheel (815) is rotatably connected to the cutting conveyor frame (801). The front and rear halves of the cutting conveyor (801) are provided with support plates (817) for stabilizing the cutting conveyor belt (811). Between the two third conveyor rollers (806) is a cutting mounting seat (818) connected to the cutting mechanism (600). The cutting mounting seat (818) has a replaceable cutting table (819), and the cutting mechanism (600) is located directly above the cutting table (819).

8. The equipment for processing plastic bags for supermarkets as described in claim 7, characterized in that: It also includes a lateral adjustment mechanism (900), which includes two guide rails (901) mounted on the cutting conveyor (801). A slide (902) is mounted on the guide rail (901). The slide (902) is driven by a drive cylinder to move along the length of the guide rail (901). A mounting plate (903) is mounted on the slide (902). The two sides of the cutting mechanism (600) are supported by the mounting plates (903) respectively. The cutting mechanism (600) and the cutting mounting base (818) move with the mounting plates (903).

9. The equipment for processing plastic bags for supermarkets as described in claim 8, characterized in that: The cutting mechanism (600) includes a cutting frame (601), with its two sides respectively mounted on each of the mounting plates (903). The cutting frame (601) contains several columns (602), the upper end of each column (602) connected to the top of the cutting frame (601), and the lower end of each column (602) connected to the mounting plate (903). Each column (602) is connected to both sides of a positioning seat (603). Two cutting cylinders (605) are mounted on the positioning seat (603), with the upper half of each cutting cylinder (605) movably passing through the top of the cutting frame (601). The output end of each cutting cylinder (605) is connected to... The upper end of the tool holder (606) is connected to the tool holder (608) through several guide rods (607). Several second weight-reducing holes (609) are provided on the tool holder (608). The lower end of the tool holder (608) is provided with a tool body (610) that works with the cutting table (819). The upper end of the tool holder (608) is connected to the tool holder (606) through several springs (611). Each spring (611) is sleeved on each telescopic rod (612). The two ends of each telescopic rod (612) are connected to the tool holder (608) and the tool holder (606) respectively. When cutting downwards, the telescopic rod (612) will extend and retract. The positioning seat (603) is provided with two first limiting members, each of which includes a limiting rod (613). Each limiting rod (613) has a limiting head (615) and is used to limit the cutter holder (606) and has a telescopic spring function. A height threaded adjustment rod (616) is provided between each limiting rod (613). The lower end of the height threaded adjustment rod (616) is rotatably connected to the positioning seat (603), and the upper end is threadedly connected to the top of the cutting frame (601) and locked by a locking nut (680). The cutter holder (606) is provided with second limiting members (617) on both sides, which have the same structure as the first limiting members. The cutter holder (606) is provided with a stroke limiting component, which includes a fixed rod (618) connected to the cutter holder (606), a limiting plate (619) on the fixed rod (618), a limiting inclined surface (620) at the lower end of the limiting plate (619), and a limiting wheel (621) and a stroke sensing limiting sensor (622) on the cutting frame (601) for use with the limiting inclined surface (620).

10. A method for processing plastic bags for supermarkets, characterized in that, Includes the following steps: The rolled plastic film raw material is mounted on the top unwinding spindle (102) of the raw material unwinding and feeding mechanism (100). The unwinding drive motor (132) drives the spiral unwinding roller (107) to rotate. The film is released from the top unwinding spindle (102) and passes through the upper transition guide roller (103) and the lower transition guide roller (105) to complete the initial guidance and leveling. The width limit adjustment frame (106) adjusts the lateral limit according to the film width to prevent the film from moving left and right. The film enters between the spiral unwinding roller (107) and the lower pressure driven pressing roller (108) and is clamped and conveyed. The spiral pattern (135) on the surface of the spiral unwinding roller (107) spreads the film to both sides to eliminate wrinkles, curling and stacking defects. After being combed by the middle auxiliary guide roller (109), the upper auxiliary guide roller (130) and the bottom discharge guide roller (131), it is sent into the guiding mechanism (200). The conveying motor (501) of the conveying section drive assembly (500) synchronously drives the material guiding drive assembly (502) and the transition drive assembly (503). The material guiding spindle (201) drives the material guiding conveyor belt (203) to rotate. The first material guiding tension adjusting roller (206) and the second material guiding tension adjusting roller (207) adjust the tension of the material guiding conveyor belt (203). The film material is uniformly conveyed backward from the material guiding conveyor belt (203) to the middle transition conveying assembly (300). The transition spindle drives the transition belt (302) to rotate, receiving the film material to complete the transition conveying and continuously supplying material to the cutting conveying mechanism (800). The cutting transmission motor (812) of the cutting section drive assembly (700) drives the cutting transmission cylinder (805) to rotate via the cutting transmission belt (813), thereby driving the cutting transmission belt (811) to run. The support plate (817) supports the cutting transmission belt (811) to maintain stability. The film material passes through the cutting table (819) below the cutting mechanism (600) along with the cutting transmission belt (811). The cutting cylinder (605) pushes the knife holder (606) to move downward. The knife holder (606) drives the knife holder (608) and the knife body (610) to move downward via the guide rod (607). The spring (611) and the extension The retractor (612) buffers the cutting pressure, and the limit rod (613), the height threaded adjustment rod (616), and the stroke sensing limit sensor (622) work together to limit the downward stroke of the cutter holder (606). The cutter body (610) and the cutting table (819) work together to complete the film cutting. A single plastic bag is transported to the next process by the cutting conveyor belt (811). When the cutting position needs to be adjusted, the drive cylinder of the lateral adjustment mechanism (900) drives the slide (902) to move along the guide rail (901), and the mounting plate (903) synchronously drives the cutting mechanism (600) and the cutting mounting seat (818) to move laterally.

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