Cutting equipment for packaging bags

Abstract

The invention relates to the technical field of packaging bags, and discloses a packaging bag cutting device which comprises a supporting plate and further comprises a body part arranged on the supporting plate and used for cutting packaging bag raw materials; the discharging part is arranged on the supporting plate and used for controlling discharging of the packaging bag raw materials; the lifting part is installed on the supporting plate and used for adapting to the height of the packaging bag raw materials; the cutting part is arranged on the supporting plate and is used for feeding the raw materials of the packaging bags; after the cutting part is started, the discharging part can limit the conveying speed of the cutting part to the packaging bag raw materials, and the size of the continuously conveyed packaging bag raw materials can be reduced. By arranging the discharging part, the problems that most traditional friction rings are of a fixed damping structure, when facing a PE film and a PET film, a machine needs to be shut down to replace friction assemblies of different specifications, time consumed for machine adjustment every time is long, and the assembly line switching efficiency is seriously affected are solved.

Description

Technical Field

[0001] The present invention relates to the technical field of packaging bags, in particular to a cutting device for packaging bags. Background Art

[0002] With the large-scale development of industries such as food, medicine, chemicals, and e-commerce, the demand for packaging bags has exploded. According to statistics, the global flexible packaging market size will reach US$120 billion in 2024, of which China accounts for more than 35%, and the average annual growth rate remains above 7%. The production of packaging bags has shifted from traditional manual bag making to highly automated assembly line operations, which puts higher demands on the efficiency, precision, and adaptability of cutting equipment.

[0003] However, in the existing cutting equipment for packaging bags, the traditional friction rings are mostly fixed damping structures. When dealing with PE film and PET film, the machine needs to be stopped to replace friction components of different specifications. Each machine adjustment takes a long time, which seriously affects the switching efficiency of the assembly line. Summary of the Invention

[0004] The purpose of the present invention is to provide a cutting device for packaging bags. By setting up a discharge part, it solves the problem that traditional friction rings are mostly fixed damping structures. When facing PE film and PET film, it is necessary to stop the machine and replace friction components of different specifications. Each machine adjustment takes a long time, which seriously affects the switching efficiency of the assembly line.

[0005] To solve the above technical problems, the present invention is achieved through the following technical solutions: The present invention is a cutting device for packaging bags, comprising a support plate, and also comprising: a main body, which is arranged on the support plate and is used to cut the packaging bag raw material; a discharge part, which is arranged on the support plate and is used to control the discharge of the packaging bag raw material; a lifting part, which is installed on the support plate and is used to adapt the height of the packaging bag raw material; and a cutting part, which is arranged on the support plate and is used to feed the packaging bag raw material; wherein, after the cutting part is started, the discharge part will limit the conveying speed of the cutting part on the packaging bag raw material, and the volume of the packaging bag raw material will become smaller as it is continuously conveyed, and the lifting part will adjust in accordance with the height of the packaging bag raw material.

[0006] Furthermore, the main body includes a plastic roll arranged above a support plate, a fixed rod is provided above the support plate, an electric telescopic rod is fixedly connected to the fixed rod, an output shaft of the electric telescopic rod is fixedly connected to a cutter, and an anvil is provided above the support plate, and the cutter is in contact with the anvil; wherein, when the plastic roll is conveyed to the bottom of the cutter, the electric telescopic rod is started, and the plastic roll is cut by the cooperation of the cutter and the anvil.

[0007] Furthermore, the discharging part includes a friction component, which is arranged on the lifting part and is used to prevent the packaging bag raw material from being discharged too much; the friction component includes a rotating shaft 1 that passes through the slide rod, the rotating shaft 1 is rotatably connected to the slide rod, the outer wall of the rotating shaft 1 is provided with a friction ring, the front side of the slide rod located at the front side is fixedly connected with a fixing ring, the front side of the fixing ring is fixedly connected with a limiting ring, the front side of the fixing ring is rotatably connected with a plurality of bidirectional threaded rods, the front sides of the plurality of bidirectional threaded rods are fixedly connected with nuts, and a tightening ring is provided in the limiting ring. Firmware; wherein, when the rotating shaft rotates, the friction ring will not rotate therewith due to the action of the fixing ring, and the fastener includes two push blocks arranged in the limiting ring, and the two push blocks are threadedly connected to a plurality of bidirectional threaded rods, and the two push blocks are in contact with the friction ring, and the two push blocks are in contact with the limiting ring; wherein, when the bidirectional threaded rod rotates, the two push blocks will move relative to each other, and when the two push blocks move, the friction ring will be squeezed inward through the inclination angle on them, and the friction assembly will limit the discharge speed of the plastic roll and prevent the plastic roll from loosening.

[0008] Furthermore, a support assembly is provided on the lifting part for supporting the raw material of the packaging bag; wherein the support assembly is installed on the friction assembly, and the friction assembly is used to limit the self-rotation and reversal of the support assembly, and the support assembly includes a connecting block fixedly connected to the rear side of the rotating shaft, a rectangular block is provided in the connecting block, and the rear side of the rectangular block is fixedly connected to a support rod, and the support rod passes through the sliding rod located at the rear side, and the rear side of the sliding rod located at the rear side is hingedly provided with a hinge plate; wherein the rectangular block can be pulled out from the connecting block, and the support rod is pulled out from the sliding rod located at the rear side, and the hinge plate is lowered after the support rod is installed. At this time, the hinge plate will limit the support rod from falling off the sliding rod, and the support assembly can fix the plastic roll so that it rotates synchronously with the friction assembly.

[0009] The lifting part includes two hollow rods fixedly connected to the top of the support plate, and the inner walls of the two hollow rods are slidably connected to the sliding rods, and the two hollow rods are provided with springs, the tops of the two springs are fixedly connected to the two sliding rods respectively, and the bottoms of the two springs are fixedly connected to the two hollow rods respectively, and a limiting member is provided between the two hollow rods; wherein the spring is in a stretched state, the plastic roll contacts the limiting member, and after the volume of the plastic roll becomes smaller and smaller, the spring will pull the plastic roll downward, thereby cooperating with the feeding of the cutting part, and the limiting member includes a rotating shaft 2 rotatably connected between the two hollow rods, the outer wall of the rotating shaft 2 is fixedly connected to a round roller, and the round roller contacts the plastic roll; wherein the round roller and the rotating shaft 2 will limit the plastic roll from moving downward, so that its output end and the gap between the two friction rollers are in a horizontal state, and the lifting part can make the plastic roll be discharged in a better position, so that the discharge is on the same horizontal plane.

[0010] Furthermore, the cutting portion includes two fixed plates fixedly connected to the top of the support plate, two rotating shafts three are rotatably connected between the two fixed plates, the front sides of the two rotating shafts three pass through the fixed plate located on the front side, the outer walls of the two rotating shafts three are fixedly connected with friction rollers, the outer walls of the two rotating shafts three are fixedly connected with gears, the two gears are meshed, and two smoothing members are installed on the fixed plate; wherein, when the rotating shaft three rotates, due to the action of the gears, the two rotating shafts three rotate in opposite directions, and the two friction rollers rotate along with them, and when the two friction rollers rotate, the plastic roll will be pulled, and the smoothing member includes a rotating shaft four rotatably connected between the two fixed plates, the outer wall of the rotating shaft four is fixedly connected with a pressure roller, and the pressure roller contacts the plastic roll, and a motor is fixedly connected to the front side of the fixed plate located on the front side, and the output shaft of the motor is fixedly connected to the rotating shaft three through a coupling; wherein, when the plastic roll passes between the two pressure rollers, it will be flattened by the two pressure rollers, and the cutting portion can smooth the plastic roll before cutting, so that the cutting is more neat.

[0011] The present invention has the following beneficial effects: 1. The present invention sets a discharge part, and installs the plastic roll on the slide rod. When installing, the support rod is removed, and then the plastic roll is placed between the two slide rods. Then the support rod is inserted into the fixing ring at the rear side, and then the support rod is passed through the plastic roll. After passing through, the rectangular block on the support rod is installed in the connecting block, and then the hinge plate is lowered to limit the support rod, thereby achieving the fixation of the plastic roll. Then, the tightness of the friction ring is adjusted according to the material of the plastic roll. When adjusting, the nut is rotated diagonally. When the nut is rotated, the bidirectional threaded rod is rotated with it. When the bidirectional threaded rod is rotated, the two push blocks are brought close to each other. When the two push blocks are close to or away from each other, the friction ring will become loose when they are away from each other, and will become tighter and tighter when they are close to each other. By adjusting the tightness of the friction ring, the rotation speed of the rotating shaft and the friction force of the friction ring on the rotating shaft can be adjusted. The connecting block rotates coaxially with the rotating shaft, thereby preventing the support rod from reversing, rotating and rotating multiple times, and realizing dynamic and precise adjustment of the unwinding process, which not only ensures the consistency of the feeding length during cutting, but also can be flexibly adapted according to the material characteristics, reducing material waste caused by improper tension control, and is especially suitable for packaging production lines with high requirements on cutting accuracy and production efficiency.

[0012] 2. This invention incorporates a lifting mechanism. As the motor rotates continuously, the plastic roll shrinks continuously. As the roll shrinks, its contact position with the rollers also changes. Consequently, two sliding rods, carried by two springs, move simultaneously within the hollow rod and downward, aligning the discharge end of the plastic roll with the two pressure rollers and two friction rollers. This converts the volume change of the plastic roll during unwinding into a controllable vertical displacement, achieving "dynamic self-calibration" of the discharge end position. Essentially, this method replaces traditional manual adjustment with physical elastic compensation, ensuring both linear material delivery and tension stability.

[0013] 3. The present invention sets a cutting part. After the adjustment is completed, the other end of the plastic roll is stretched between the two pressure rollers and the two friction rollers. After installation, the motor is started. When the motor rotates, the upper rotating shaft three will also rotate accordingly. When the upper rotating shaft three rotates, it will drive the lower gear to rotate through the gear on its outer wall. When the lower gear rotates, it will drive the lower rotating shaft three to reverse. When the two rotating shafts three rotate, the two friction rollers will also rotate. When the two friction rollers rotate, the plastic roll will be transported to the right through friction. When the material roll passes through the two pressure rollers, it will be flattened by the two pressure rollers and the wrinkles on it will be smoothed out. When the plastic roll is transported to the bottom of the cutter, the motor is stopped and the electric telescopic rod on the fixed rod is started. When the electric telescopic rod moves, it will move the cutter downward. At this time, the rotating shaft four will cooperate with the cutting board to cut the plastic roll, thereby achieving the cutting effect. The wrinkles of the material are smoothed out simultaneously during transportation, which not only ensures the flatness of the cutting surface, but also avoids cutting dislocation caused by uneven materials. It is especially suitable for thin films that are easily deformed, and reduces waste caused by poor material condition.

[0014] Of course, any product implementing the present invention does not necessarily need to achieve all of the advantages described above at the same time. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following briefly introduces the drawings required for describing the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0016] Figure 1 It is a schematic diagram of the overall structure of the present invention; Figure 2 It is a partial cross-sectional structural schematic diagram of the present invention as a whole; Figure 3 It is a partial cross-sectional structural schematic diagram of the lifting part of the present invention; Figure 4 It is a partial cross-sectional structural schematic diagram of the round roller of the present invention; Figure 5 It is a schematic diagram of the partial cross-sectional structure of the cutter of the present invention; Figure 6 This is a schematic diagram of the explosion structure of the friction assembly of the present invention; Figure 7 For the present invention Figure 3 Schematic diagram of the enlarged structure of A in the middle; Figure 8 For the present invention Figure 2 Schematic diagram of the enlarged structure of B Figure 9 For the present invention Figure 2 Schematic diagram of the enlarged structure of C in the middle Figure 10 For the present invention Figure 3 Schematic diagram of the enlarged structure of D in the middle.

[0017] In the accompanying drawings, the components represented by the reference numerals are as follows: In the figure: 1. main body; 111. support plate; 112. plastic roll; 113. fixed rod; 114. electric telescopic rod; 115. cutter; 116. cutting board; 2. discharging part; 21. friction assembly; 211. rotating shaft 1; 212. friction ring; 213. fixed ring; 214. limiting ring; 215. two-way threaded rod; 216. nut; 217. push block; 22. support assembly; 221. connecting block; 222. rectangular block; 223. support rod; 224. hinge plate; 3. lifting part; 311. hollow rod; 312. sliding rod; 313. spring; 314. rotating shaft 2; 315. round roller; 4. cutting part; 411. fixed plate; 412. rotating shaft 3; 413. friction roller; 414. gear; 415. rotating shaft 4; 416. pressure roller; 417. motor. DETAILED DESCRIPTION

[0018] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0019] See also Figures 1-10As shown, the present invention is a cutting device for packaging bags, including a support plate 111, and also includes: a main body 1, the main body 1 is arranged on the support plate 111, and is used to cut the packaging bag raw material; a discharge part 2, the discharge part 2 is arranged on the support plate 111, and is used to control the discharge of the packaging bag raw material; a lifting part 3, the lifting part 3 is installed on the support plate 111, and is used to adapt the height of the packaging bag raw material; and a cutting part 4, the cutting part 4 is arranged on the support plate 111, and is used to feed the packaging bag raw material; wherein, after the cutting part 4 is started, the discharge part 2 will limit the conveying speed of the cutting part 4 to the packaging bag raw material, and continuously convey the volume of the packaging bag raw material. The lifting part 3 will be adjusted according to the height of the raw material of the packaging bag. The main body 1 includes a plastic roll 112 arranged above the support plate 111. A fixed rod 113 is provided above the support plate 111. An electric telescopic rod 114 is fixedly connected to the fixed rod 113. The output shaft of the electric telescopic rod 114 is fixedly connected to a cutter 115. A cutting board 116 is provided above the support plate 111. The cutter 115 is in contact with the cutting board 116. When the plastic roll 112 is transported to the bottom of the cutter 115, the electric telescopic rod 114 is started, and the plastic roll 112 is cut by the cooperation of the cutter 115 and the cutting board 116. The discharge part 2 includes a friction component. 21, the friction assembly 21 is arranged on the lifting part 3, and is used to prevent the packaging bag raw material from being discharged too much; and the support assembly 22, the support assembly 22 is arranged on the lifting part 3, and is used to support the packaging bag raw material; wherein, the support assembly 22 is installed on the friction assembly 21, and the self-rotation and reversal of the support assembly 22 are limited by the friction assembly 21, and the friction assembly 21 includes a rotating shaft 211 that passes through the slide bar 312, and the rotating shaft 211 is rotatably connected to the slide bar 312. The outer wall of the rotating shaft 211 is provided with a friction ring 212, and the front side of the front slide bar 312 is fixedly connected to a fixing ring 213, and the front side of the fixing ring 213 is fixedly connected to a limiting ring 214 The front side of the fixing ring 213 is rotatably connected to a plurality of bidirectional threaded rods 215, and the front sides of the plurality of bidirectional threaded rods 215 are fixedly connected to nuts 216, and a fastener is provided in the limiting ring 214; wherein, when the rotating shaft 211 rotates, the friction ring 212 does not rotate therewith due to the action of the fixing ring 213, and the supporting assembly 22 includes a connecting block 221 fixedly connected to the rear side of the rotating shaft 211, a rectangular block 222 is provided in the connecting block 221, and a supporting rod 223 is fixedly connected to the rear side of the rectangular block 222, and the supporting rod 223 passes through the sliding rod 312 at the rear side, and a hinge plate 224 is hingedly provided on the rear side of the sliding rod 312 at the rear side;The rectangular block 222 can be pulled out from the connecting block 221, and the support rod 223 can be pulled out from the slide rod 312 at the rear side. After the support rod 223 is installed, the hinge plate 224 is lowered. At this time, the hinge plate 224 will limit the support rod 223 from falling off from the slide rod 312. The fastener includes two push blocks 217 arranged in the limit ring 214. The two push blocks 217 are both threadedly connected to a number of bidirectional threaded rods 215. The two push blocks 217 are in contact with the friction ring 212. The two push blocks 217 are both in contact with the friction ring 212. The two push blocks 217 move relative to each other, squeezing the friction ring 212 inward at their inclined angles. The discharging section 2 allows for dynamic and precise adjustment of the unwinding process, ensuring consistent feed length during cutting while flexibly adapting to material characteristics. This reduces material waste due to improper tension control and is particularly suitable for packaging production lines requiring high cutting accuracy and production efficiency.

[0020] The lifting part 3 includes two hollow rods 311 fixedly connected to the top of the support plate 111, the inner walls of the two hollow rods 311 are slidably connected to the sliding rods 312, and springs 313 are provided in the two hollow rods 311. The tops of the two springs 313 are fixedly connected to the two sliding rods 312 respectively, and the bottoms of the two springs 313 are fixedly connected to the two hollow rods 311 respectively. A limiting member is provided between the two hollow rods 311; wherein the spring 313 is in a stretched state, the plastic roll 112 contacts the limiting member, and when the volume of the plastic roll 112 becomes smaller and smaller, the spring 313 will press the plastic roll 112 into the plastic roll 112. Roll 112 is pulled downward, thereby coordinating the conveying of cutting section 4. The limiting member includes a second rotating shaft 314 rotatably connected between two hollow rods 311. A circular roller 315 is fixedly connected to the outer wall of rotating shaft 314, and circular roller 315 contacts plastic roll 112. The circular roller 315 and rotating shaft 314 restrict the downward movement of plastic roll 112, so that its output end and the gap between the two friction rollers 413 are horizontal. By providing a lifting section 3, the volume change of the plastic roll during unwinding is converted into controllable vertical displacement, achieving "dynamic self-calibration" of the discharge end position. Essentially, this replaces traditional manual adjustment with physical elastic compensation, ensuring both linear material conveyance and tension stability.

[0021] The cutting portion 4 includes two fixed plates 411 fixedly connected to the top of the support plate 111, two rotating shafts 3 412 are rotatably connected between the two fixed plates 411, the front sides of the two rotating shafts 3 412 pass through the fixed plate 411 located on the front side, the outer walls of the two rotating shafts 3 412 are fixedly connected with friction rollers 413, the outer walls of the two rotating shafts 3 412 are fixedly connected with gears 414, the two gears 414 are meshed with each other, and two smoothing members are installed on the fixed plate 411; wherein, when the rotating shaft 3 412 rotates, due to the action of the gear 414, the two rotating shafts 3 412 rotate in opposite directions, and the two friction rollers 413 rotate along with them, and when the two friction rollers 413 rotate, the plastic roll 112 will be pulled and smoothed. The flat piece includes a rotating shaft four 415 rotatably connected between two fixed plates 411, and a pressure roller 416 is fixedly connected to the outer wall of the rotating shaft four 415. The pressure roller 416 is in contact with the plastic roll 112, and a motor 417 is fixedly connected to the front side of the front fixed plate 411. The output shaft of the motor 417 is fixedly connected to the rotating shaft three 412 through a coupling; wherein, when the plastic roll 112 passes between the two pressure rollers 416, it will be flattened by the two pressure rollers 416. By providing the cutting part 4, the wrinkles of the material can be smoothed out synchronously during transportation, which not only ensures that the cutting surface is flat, but also avoids cutting dislocation caused by uneven materials. It is especially suitable for thin film materials that are easily deformed, and reduces waste caused by poor material condition.

[0022] When in use, first install the plastic roll 112 on the slide rod 312, remove the support rod 223 during installation, then place the plastic roll 112 between the two slide rods 312, then insert the support rod 223 into the fixing ring 213 at the rear side, and then pass the support rod 223 through the plastic roll 112. After passing through, install the rectangular block 222 on the support rod 223 into the connecting block 221, and then lower the hinge plate 224 to restrict the support rod 223, thereby achieving the fixation of the plastic roll 112, and then adjust the tightness of the friction ring 212 according to the material of the plastic roll 112. When adjusting, turn the nut 216 diagonally. When the nut 216 is turned, it will bring the bidirectional threaded rod 2 15 rotates accordingly, and when the bidirectional threaded rod 215 rotates, it will bring the two push blocks 217 closer to or away from each other. When the two push blocks 217 move away from each other, the friction ring 212 will become loose, and will become tighter and tighter when they move closer to each other. By adjusting the tightness of the friction ring 212, the rotation speed of the rotating shaft 1 211 and the friction force of the friction ring 212 on the rotating shaft 1 211 can be adjusted. The connecting block 221 rotates coaxially with the rotating shaft 1 211, thereby preventing the support rod 223 from reversing, rotating, and rotating multiple times. After the adjustment is completed, the other end of the plastic roll 112 is stretched between the two pressure rollers 416 and between the two friction rollers 413. After installation, the motor 41 is started. 7. When the motor 417 rotates, the upper rotating shaft 3 412 will also rotate accordingly. When the upper rotating shaft 3 412 rotates, the gear 414 on its outer wall will drive the lower gear 414 to rotate. When the lower gear 414 rotates, the lower rotating shaft 3 412 will be reversed. When the two rotating shafts 3 412 rotate, the two friction rollers 413 will also rotate accordingly. When the two friction rollers 413 rotate, the plastic roll 112 will be transported to the right through friction. When the plastic roll 112 passes through the two pressing rollers 416, it will be flattened by the two pressing rollers 416 and the wrinkles on it will be smoothed. When the plastic roll 112 is transported to the bottom of the cutter 115, the motor 41 is stopped. 7. Start the electric telescopic rod 114 on the fixed rod 113. When the electric telescopic rod 114 moves, it will move the cutter 115 downward. At this time, the rotating shaft 415 will cooperate with the anvil 116 to cut the plastic roll 112, thereby achieving the cutting effect. As the motor 417 continues to rotate, the plastic roll 112 will continue to shrink. When the volume of the plastic roll 112 shrinks, the position of contact with the round roller 315 will also change. Therefore, the two sliding rods 312 will be carried by the two springs 313, and at the same time run in the hollow rod 311 and move downward, so that the discharge end of the plastic roll 112 is horizontal with the two pressure rollers 416 and the two friction rollers 413.

[0023] The preferred embodiments of the present invention disclosed above are intended only to help illustrate the present invention. These preferred embodiments do not exhaustively describe all details, nor do they limit the present invention to the specific embodiments described. Obviously, many modifications and variations are possible based on the content of this specification. These embodiments are selected and described in detail in this specification to better explain the principles and practical applications of the present invention, thereby enabling those skilled in the art to better understand and utilize the present invention. The present invention is limited only by the claims and their full scope and equivalents.

Claims

1. A cutting device for packaging bags, comprising a support plate (111), characterized in that: Also includes: A main body (1), the main body (1) being arranged on a support plate (111) and being used for cutting packaging bag raw materials; A discharge portion (2), the discharge portion (2) being arranged on the support plate (111) and used for controlling the discharge of packaging bag raw materials; A lifting part (3), the lifting part (3) being mounted on the support plate (111) and used for adjusting the height of the packaging bag raw material; as well as A cutting portion (4), the cutting portion (4) being arranged on the support plate (111) and being used for feeding the packaging bag raw material; After the cutting part (4) is started, the discharging part (2) will limit the conveying speed of the cutting part (4) to the packaging bag raw material, and the volume of the packaging bag raw material will become smaller as it is continuously conveyed, and the lifting part (3) will adjust in accordance with the height of the packaging bag raw material.

2. The cutting device for packaging bags according to claim 1, characterized in that: The main body (1) includes a plastic roll (112) arranged above a support plate (111); a fixing rod (113) is arranged above the support plate (111); an electric telescopic rod (114) is fixedly connected to the fixing rod (113); an output shaft of the electric telescopic rod (114) is fixedly connected to a cutter (115); a cutting board (116) is arranged above the support plate (111); and the cutter (115) is in contact with the cutting board (116); When the plastic roll (112) is conveyed to the bottom of the cutter (115), the electric telescopic rod (114) is activated, and the plastic roll (112) is cut by the cooperation of the cutter (115) and the cutting board (116).

3. The cutting device for packaging bags according to claim 2, characterized in that: The discharge portion (2) includes a friction component (21), and the friction component (21) is arranged on the lifting portion (3) and is used to prevent excessive discharge of packaging bag raw materials; and A support assembly (22), the support assembly (22) being arranged on the lifting portion (3) and used for supporting the packaging bag raw material; The support assembly (22) is mounted on the friction assembly (21), and the friction assembly (21) limits the self-rotation and reverse rotation of the support assembly (22).

4. The cutting device for packaging bags according to claim 3, characterized in that: The lifting portion (3) includes two hollow rods (311) fixedly connected to the top of the support plate (111), the inner walls of the two hollow rods (311) are slidably connected to the sliding rods (312), and springs (313) are provided in the two hollow rods (311), the tops of the two springs (313) are respectively fixedly connected to the two sliding rods (312), and the bottoms of the two springs (313) are respectively fixedly connected to the two hollow rods (311), and a limiting member is provided between the two hollow rods (311); The spring (313) is in a stretched state, and the plastic roll (112) contacts the limiting member. When the volume of the plastic roll (112) becomes smaller and smaller, the spring (313) pulls the plastic roll (112) downward, thereby cooperating with the conveying of the cutting part (4).

5. The cutting device for packaging bags according to claim 4, characterized in that: The cutting portion (4) includes two fixed plates (411) fixedly connected to the top of the support plate (111), two rotating shafts (412) are rotatably connected between the two fixed plates (411), the front sides of the two rotating shafts (412) pass through the fixed plate (411) located at the front side, the outer walls of the two rotating shafts (412) are fixedly connected to friction rollers (413), the outer walls of the two rotating shafts (412) are fixedly connected to gears (414), the two gears (414) are meshed with each other, and two smoothing members are installed on the fixed plate (411); When the rotating shaft (412) rotates, the two rotating shafts (412) rotate in opposite directions due to the action of the gear (414), and the two friction rollers (413) rotate along with it. When the two friction rollers (413) rotate, the plastic roll (112) is pulled.

6. The cutting device for packaging bags according to claim 5, characterized in that: The friction assembly (21) includes a rotating shaft (211) passing through the slide bar (312), the rotating shaft (211) is rotatably connected to the slide bar (312), the outer wall of the rotating shaft (211) is provided with a friction ring (212), the front side of the slide bar (312) is fixedly connected to a fixing ring (213), the front side of the fixing ring (213) is fixedly connected to a limiting ring (214), the front side of the fixing ring (213) is rotatably connected to a plurality of bidirectional threaded rods (215), the front sides of the plurality of bidirectional threaded rods (215) are fixedly connected to nuts (216), and a fastener is provided in the limiting ring (214); When the rotating shaft (211) rotates, the friction ring (212) does not rotate therewith due to the action of the fixing ring (213).

7. The cutting device for packaging bags according to claim 6, characterized in that: The support assembly (22) includes a connecting block (221) fixedly connected to the rear side of the rotating shaft (211), a rectangular block (222) is provided in the connecting block (221), a supporting rod (223) is fixedly connected to the rear side of the rectangular block (222), the supporting rod (223) passes through the sliding rod (312) located at the rear side, and a hinge plate (224) is hingedly provided on the rear side of the sliding rod (312) located at the rear side; The rectangular block (222) can be pulled out from the connecting block (221), and the support rod (223) can be pulled out from the slide rod (312) located at the rear side. After the support rod (223) is installed, the hinge plate (224) is lowered. At this time, the hinge plate (224) will restrict the support rod (223) from falling off from the slide rod (312).

8. The cutting device for packaging bags according to claim 7, characterized in that: The limiting member includes a second rotating shaft (314) rotatably connected between two hollow rods (311), a circular roller (315) is fixedly connected to the outer wall of the second rotating shaft (314), and the circular roller (315) is in contact with the plastic roll (112); The circular roller (315) and the second rotating shaft (314) restrict the plastic roll (112) from moving downward, so that the gap between the output end and the two friction rollers (413) is in a horizontal state.

9. The cutting device for packaging bags according to claim 8, characterized in that: The smoothing member includes a rotating shaft (415) rotatably connected between two fixed plates (411), a pressure roller (416) is fixedly connected to the outer wall of the rotating shaft (415), and the pressure roller (416) contacts the plastic roll (112). A motor (417) is fixedly connected to the front side of the fixed plate (411) located at the front side, and the output shaft of the motor (417) is fixedly connected to the rotating shaft (412) via a coupling; When the plastic roll (112) passes between the two pressing rollers (416), it is flattened by the two pressing rollers (416).

10. The cutting device for packaging bags according to claim 9, characterized in that: The fastener comprises two push blocks (217) arranged in a limiting ring (214), the two push blocks (217) are both threadedly connected to a plurality of bidirectional threaded rods (215), the two push blocks (217) are both in contact with the friction ring (212), and the two push blocks (217) are both in contact with the limiting ring (214); When the bidirectional threaded rod (215) rotates, the two push blocks (217) move relative to each other, and when the two push blocks (217) move, the friction ring (212) is squeezed inwards by the inclination angle on the push blocks (217).

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