A packaging cardboard cutting mechanism

Abstract

The present invention discloses a packaging cardboard cutting mechanism, comprising a bracket, the upper surface of which is equipped with a paper feeding mechanism and a paper cutting and storing mechanism, the paper feeding mechanism and the paper cutting and storing mechanism are arranged opposite to each other on the upper surface of the bracket, one end of the bracket is equipped with a paper roll placing roller, the paper feeding mechanism comprises a first mounting plate fixedly arranged on the upper surface of the bracket, four corners of the upper surface of the first mounting plate are provided with columns, the upper end of the column is provided with a fixing plate, a telescopic rod is centrally provided on the fixing plate, the output end of the telescopic rod is connected with a connecting piece, and pneumatic clamps are installed on both sides of the lower end of the connecting piece. The pneumatic clamps in the paper feeding mechanism of the present invention clamp the end of the cardboard, and the paper can be pulled and transported by the telescopic rod, and the cardboard is transported to the paper cutting and storing mechanism. During the whole process, the cardboard is clamped by the pneumatic clamps and will not deviate, so that the cardboard has a positioning effect while being transported, and during cutting, the pneumatic clamps ensure that the cardboard is not affected by the operation of the paper cutting and storing mechanism.

Description

Technical Field

[0001] This invention belongs to the technical field of packaging paper processing equipment, specifically a packaging paperboard cutting mechanism. Background Technology

[0002] Cardboard used for packaging items is usually made of rigid cardboard, which is formed by gluing together multiple rolls of paper. Usually, batches of cardboard need to be cut to meet the requirements and then sent to downstream factories for printing, lamination and assembly. When cutting cardboard, it is necessary to fix and position it, usually at the four corners of the upper surface of the cardboard. However, this method requires workers to install four fixing structures when cutting cardboard, which is very troublesome to install and disassemble.

[0003] Chinese patent CN216993226U discloses a fixing mechanism for cutting cardboard. By utilizing the elastic force provided by the limiting spring, the fixing plate can fix the cardboard, making it easy for users to assemble and disassemble, thus improving the efficiency of assembly and disassembly. The use of counterweights can apply gravity to the fixing plate, thereby increasing the pressure on the cardboard and further improving the fixing performance of the device. By rotating the rotating wheel, the lead screw can be rotated, thereby causing the screw and sleeve to move left and right, which in turn drives the side limiting plate to move left and right. The side limiting plate can fix the cardboard from the side and can be adjusted according to the cutting area of ​​the cardboard, greatly improving the flexibility of the device.

[0004] In existing technologies, cardboard is usually cut to a certain length, and after cutting, multiple pieces of cardboard are stacked and pressed with a fixing mechanism. Then, it is trimmed as needed. This process generates a lot of cardboard waste, which is wasteful. In addition, the cardboard needs to go through two cutting processes, which makes the processing cumbersome to some extent. Summary of the Invention

[0005] The purpose of this section is to outline some aspects of embodiments of the present invention and to briefly describe some preferred embodiments. Simplifications or omissions may be made in this section, as well as in the abstract and title of this application, to avoid obscuring the purpose of these documents; however, such simplifications or omissions should not be construed as limiting the scope of the invention.

[0006] To address the problems mentioned in the background section, the present invention adopts the following technical solution.

[0007] A packaging cardboard cutting mechanism includes a support frame. A paper feeding mechanism and a paper cutting and storage mechanism are mounted on the upper surface of the support frame. The paper feeding mechanism and the paper cutting and storage mechanism are arranged opposite to each other on the upper surface of the support frame. A paper roll placement roller is mounted on one end of the support frame. The paper feeding mechanism includes a first mounting plate fixedly mounted on the upper surface of the support frame. Each of the four corners of the upper surface of the first mounting plate is provided with a column. A fixing plate is provided at the upper end of the column. A telescopic rod is provided in the center of the fixing plate. A connecting piece is connected to the output end of the telescopic rod. Pneumatic grippers are installed on both sides of the lower end of the connecting piece. The paper cutting and storage mechanism includes a second mounting plate fixedly mounted on the upper surface of the bracket. A knife holder is provided on the upper surface of the second mounting plate and on the side near the paper feeding mechanism. A cutter is slidably connected to the inner side of the knife holder. Multiple adjusting blocks are slidably connected to the other side of the upper surface of the second mounting plate. The adjusting blocks are arranged in a rectangle on the second mounting plate and are provided with stop posts.

[0008] First angle steel is installed at both ends of the first mounting plate. The first angle steel has symmetrical waist holes. The second cylinder is installed on the lower surface of the waist hole. The upper surface of the second cylinder is provided with a butterfly bolt. The butterfly bolt passes through the waist hole. Rotating the butterfly bolt clockwise fixes the second cylinder at any point in the waist hole. The lower end of the second cylinder is connected to a first clamping plate. The output end of the second cylinder passes through the first clamping plate and is connected to a pressure plate.

[0009] A pressure roller is mounted on one end of the first mounting plate near the paper roll placement roller. The pressure roller is mounted on the end of the first mounting plate via a roller frame, which is fixed on both sides of the first mounting plate near the paper roll placement roller.

[0010] The lower end of the connecting piece is equal to the length of the first angle steel, and adjustment holes are symmetrically opened on both sides of the lower end of the connecting piece. The length of the adjustment hole is equal to the length of the waist hole. The pneumatic gripper is slidably connected to the adjustment hole by bolts. Rotating the bolts can fix the pneumatic gripper at any point on the adjustment hole.

[0011] A first cylinder is mounted on the lower surface of the first mounting plate. The output end of the first cylinder passes through the first mounting plate and is connected to a lifting plate. A column is provided at each of the four corners of the lower surface of the lifting plate, and the column extends downward through the first mounting plate.

[0012] A third cylinder is mounted on the lower surface of the second mounting plate, and the output end of the third cylinder passes through the second mounting plate and is connected to the lower surface of the cutter. A sleeper is mounted on the top of the cutter holder. When the cutter moves upward through the second mounting plate, the blade contacts the lower surface of the sleeper.

[0013] A second angle steel is installed on the front surface of the sleeper. A waist hole is symmetrically opened on the second angle steel. A fifth cylinder is installed on the lower surface of the waist hole. The fifth cylinder is slidably connected to the lower surface of the waist hole. A second clamping plate is connected to the lower end of the fifth cylinder. The output end of the fifth cylinder passes through the second clamping plate and is connected to a pressure plate.

[0014] The upper surface of the second mounting plate has multiple sets of sliding grooves symmetrically opened on the other side, and the adjusting block is slidably connected in the sliding groove. Multiple screw holes are opened at the bottom of the sliding groove, and the adjusting block is provided with studs and screw holes threadedly connected. The adjusting block is fixed at any point on the sliding groove through the studs and screw holes.

[0015] A fourth cylinder is located at the center of the lower surface of the second mounting plate. The output end of the fourth cylinder passes through the second mounting plate and is connected to a support plate, which is located between the stop posts.

[0016] Compared with the prior art, the beneficial effects of the present invention are as follows: In this invention, the pneumatic grippers in the paper feeding mechanism hold the end of the cardboard. The extension and retraction of the telescopic rod enables the traction and conveying of the paper, transporting the cardboard to the paper cutting and storage mechanism. Throughout the process, the cardboard remains firmly held by the pneumatic grippers, thus providing positioning for the cardboard while it is being transported. During cutting, the pneumatic grippers ensure that the cardboard is not affected by the operation of the paper cutting and storage mechanism, preventing subsequent deformation of the cardboard. Furthermore, the pneumatic grippers can be slid and fixed on the adjustment holes via bolts, allowing for flexible adjustment of the position of the pneumatic grippers to adapt to the clamping requirements of paper of different widths and ensuring the accuracy of the paper's position during the conveying process.

[0017] In this invention, the first angle steel is provided with waist holes, which, through the cooperation of butterfly bolts, allow the spacing between the pressure plates to be adjusted. During paper feeding, precise control is achieved according to the width of the paper, providing good positioning for the paper. Furthermore, the second cylinder, through the extension and retraction of its output end, can control the spacing between the pressure plate connected to its output end and the first clamping plate, thus being suitable for pressing paper of different thicknesses and ensuring stable and flat paper conveying. In addition, the first cylinder on the lower surface of the first mounting plate and the lifting plate connected to it can support the cardboard, preventing the cardboard from bending due to its own weight and ensuring the smoothness of cardboard conveying.

[0018] In this invention, the cutter in the paper cutting and storage mechanism is slidably connected to the inner side of the cutter holder and driven by a third cylinder. A sleeper is provided on the top of the cutter holder. When the cutter moves upward to cut, the blade contacts the lower surface of the sleeper. This structure can ensure that the stroke of the cutter is fixed each time, thereby achieving precise cutting and improving cutting quality. Furthermore, an adjustable pressure plate structure is provided on the second angle steel on the front surface of the sleeper, which can assist in fixing the paper during the cutting process and can be easily released after cutting, which is conducive to the smooth storage of the paper.

[0019] In this invention, the adjusting blocks on the other side of the upper surface of the second mounting plate are arranged in a rectangle and are equipped with stop posts. By sliding the adjusting blocks in the slide groove and fixing them with studs and screw holes, the position of the stop posts can be adjusted according to the size of the paper, which plays a role in positioning the edge of the paper and further ensuring the accuracy of cutting. The fourth cylinder at the center of the lower surface of the second mounting plate is connected to the support plate. After cutting, the support plate can be raised under the drive of the fourth cylinder to lift the cut paper, which is convenient for subsequent storage operations. Attached Figure Description

[0020] Figure 1 This invention relates to a three-dimensional structure of a packaging paperboard cutting mechanism. Figure 1 .

[0021] Figure 2 This invention relates to a three-dimensional structure of a packaging paperboard cutting mechanism. Figure 2 .

[0022] Figure 3 This is an overall structural diagram of the paper feeding mechanism in this invention.

[0023] Figure 4 This is a structural diagram of the paper feeding unit in this invention.

[0024] Figure 5 In this invention Figure 4 Enlarged view of the cardboard positioning layout at point A in the middle.

[0025] Figure 6 This is a three-dimensional structural diagram of the paper cutting and storage mechanism in this invention.

[0026] Figure 7 This is a side view of the paper cutting and storage mechanism in this invention.

[0027] The correspondence between the labels and component names in the attached figures is as follows: 100. Support; 101. Paper roll placement roller; 200. Paper feeding mechanism; 201. First mounting plate; 202. First cylinder; 2021. Lifting plate; 2022. Column; 203. Fixing plate; 2031. Paper pressure roller; 204. Telescopic rod; 2041. Connecting piece; 2042. Pneumatic gripper; 205. First angle steel; 2051. Second cylinder; 2053. First clamping piece; 2052. Butterfly bolt; 300. Paper cutting and storage mechanism; 301. Second mounting plate; 302. Knife holder; 3021. Cutting knife; 30211. Third cylinder; 3022. Second angle steel; 3023. Second clamping piece; 303. Adjusting block; 3031. Stop post; 304. Support plate; 3041. Fourth cylinder. Detailed Implementation

[0028] To make the above-mentioned objects, features and advantages of the present invention more apparent and understandable, the specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

[0029] Many specific details are set forth in the following description in order to provide a full understanding of the invention. However, the invention may also be practiced in other ways different from those described herein, and those skilled in the art can make similar extensions without departing from the spirit of the invention. Therefore, the invention is not limited to the specific embodiments disclosed below.

[0030] Secondly, the term "one embodiment" or "embodiment" as used herein refers to a specific feature, structure, or characteristic that may be included in at least one implementation of the present invention. The phrase "in one embodiment" appearing in different places throughout this specification does not necessarily refer to the same embodiment, nor is it a single or selective embodiment that mutually excludes other embodiments. The present invention provides the following embodiments.

[0031] See Figure 1 and Figure 2 This is a structural diagram of the packaging cardboard cutting mechanism in this embodiment. The cutting mechanism in this embodiment includes a support 100. The upper surface of the support 100 is equipped with a paper feeding mechanism 200 and a paper cutting and storage mechanism 300. The paper feeding mechanism 200 and the paper cutting and storage mechanism 300 are arranged opposite to each other on the upper surface of the support 100. In this embodiment, the paper feeding mechanism 200 clamps and conveys the formed cardboard to the paper cutting and storage mechanism 300 for cutting and storage. During the paper feeding process, the paper feeding mechanism 200 can also position the cardboard to prevent the cardboard from shifting during the conveying process, which would cause the cut to tilt.

[0032] It is worth noting that, considering the different thicknesses of cardboard, the thinner cardboard can be wound up. Therefore, in this embodiment, a paper roll placement roller 101 is installed at one end of the support 100. The cardboard to be wound up is placed at one end of the cutting mechanism through the paper roll placement roller 101 for unwinding. When the paper is drawn out from the paper roll placement roller 101, it plays a preliminary flattening and guiding role, preventing the paper from wrinkling or shifting during the initial conveying. Furthermore, when the cardboard that can be wound up is unwound, it will bend due to its long winding time. In order to ensure that the thin cardboard can be flattened after unwinding, in this embodiment, a pressure roller 2031 is installed on one end of the first mounting plate 201 near the paper roll placement roller 101. The pressure roller 2031 is installed at the end of the first mounting plate 201 through a roller frame. The roller frame is fixed on both sides of the first mounting plate 201 near the end of the paper roll placement roller 101. The thin cardboard overlaps the pressure roller 2031 during unwinding and is stretched out by the paper feeding mechanism 200.

[0033] See Figure 3-4In this embodiment, the paper feeding mechanism 200 includes a first mounting plate 201 fixedly mounted on the upper surface of the bracket 100. Each of the four corners of the upper surface of the first mounting plate 201 has a column 2022. A fixing plate 203 is located at the upper end of each column 2022. A telescopic rod 204 is centrally located on the fixing plate 203. A connecting piece 2041 is connected to the output end of the telescopic rod 204. Pneumatic grippers 2042 are mounted on both sides of the lower end of the connecting piece 2041. In this embodiment, in the initial state, the end of the paperboard is fed from the fixing plate 203. The cardboard is pulled through to the pneumatic gripper 2042, which clamps the end of the cardboard. The telescopic rod 204 pushes the connecting piece 2041, causing the cardboard held by the pneumatic gripper 2042 to move towards the paper cutting and storage mechanism 300. Throughout the process, the cardboard is held by the pneumatic gripper 2042 and will not shift, thus providing a positioning function for the cardboard while conveying it. During cutting, the pneumatic gripper 2042 ensures that the cardboard is not affected by the operation of the paper cutting and storage mechanism 300, preventing subsequent deformation of the cardboard. See Figure 5 In this embodiment, first angle steels 205 are installed at both ends of the first mounting plate 201. Symmetrical slots are formed on the first angle steels 205. A second cylinder 2051 is installed on the lower surface of each slot. A butterfly bolt 2052 is provided on the upper surface of the second cylinder 2051. The butterfly bolt 2052 passes through the slot. Rotating the butterfly bolt 2052 clockwise fixes the second cylinder 2051 at any point within the slot. A first clamping plate 2053 is connected to the lower end of the second cylinder 2051. The output end of the second cylinder 2051 passes through the first clamping plate 2053 and is connected to a pressure plate. In this embodiment, slots are provided on the first angle steel 205. The distance between the second cylinders 2051 can be adjusted by using the butterfly bolts 2052, thereby controlling the distance between the first clamping plates 2053. When feeding paper, the distance is adjusted according to the width of the paper to ensure that the first clamping plates 2053 and the pressure plate are located on the side of the cardboard, and the edge of the cardboard contacts the inner side of the first clamping plates 2053 without abutting, thus providing a good positioning effect for the paper. Furthermore, the second cylinder 2051 can control the distance between the pressure plate and the first clamping plates connected to its output end by extending and retracting its output end, thus making it suitable for pressing paper of different thicknesses and ensuring that the paper is conveyed stably and flatly. Furthermore, in this embodiment, the lower end length of the connecting piece 2041 is equal to the length of the first angle steel 205, and adjustment holes are symmetrically opened on both sides of the lower end of the connecting piece 2041. The length of the adjustment hole is equal to the length of the waist hole. The pneumatic gripper 2042 is slidably connected to the adjustment hole by bolts. Rotating the bolts fixes the pneumatic gripper 2042 at any point on the adjustment hole. In this embodiment, the pneumatic gripper can slide and be fixed on the adjustment hole by bolts, which can flexibly adjust the position of the pneumatic gripper 2042 to ensure that the distance between the pneumatic grippers 2042 is equal to the distance between the first clamping pieces 2053, thereby better constraining and positioning the cardboard. The flexibly adjustable pneumatic gripper 2042 can adapt to the clamping requirements of paper of different widths and ensure the positional accuracy of the paper during the conveying process.

[0034] It should be noted that, since cardboard has a certain weight, in order to ensure that the cardboard does not bend due to its own weight during the conveying process, in this embodiment, a first cylinder 202 is installed on the lower surface of the first mounting plate 201. The output end of the first cylinder 202 passes through the first mounting plate 201 and is connected to a lifting plate 2021. The four corners of the lower surface of the lifting plate 2021 are provided with columns 2022, which extend downward through the first mounting plate 201. In this embodiment, the first cylinder 202 and the lifting plate 2021 connected to it can support the cardboard, prevent the cardboard from bending due to its own weight, and ensure the smoothness of the cardboard conveying.

[0035] See Figure 6 In this embodiment, the paper cutting and storage mechanism 300 includes a second mounting plate 301 fixedly mounted on the upper surface of the support 100. A knife holder 302 is provided on the upper surface of the second mounting plate 301 and on the side near the paper feeding mechanism 200. A cutter 3021 is slidably connected to the inner side of the knife holder 302. A third cylinder 30211 is mounted on the lower surface of the second mounting plate 301, and the output end of the third cylinder 30211 passes through the second mounting plate 301 and is connected to the lower surface of the cutter 3021. A sleeper is mounted on the top of the knife holder 302. When the cutter 3021 moves upward through the second mounting plate 301, the blade contacts the sleeper. On the lower surface, in this embodiment, the cutter 3021 in the paper cutting and storage mechanism 300 is slidably connected to the inner side of the cutter holder 302 and is powered by a third cylinder 30211. A sleeper is provided on the top of the cutter holder 302. When the cutter 3021 moves upward to cut, the blade contacts the lower surface of the sleeper, which can ensure that the stroke of the cutter 3021 is fixed each time, thereby achieving precise cutting and improving cutting quality. The sleeper is made of soft material, which not only meets the cutting requirements but also protects the blade of the cutter 3021, preventing the blade of the cutter 3021 from wearing out due to hard contact, thus preventing the cardboard from being cut well.

[0036] To further position the cardboard and ensure it doesn't shift due to contact with the cutter 3021 during cutting, this embodiment installs a second angle steel 3022 on the front surface of the sleeper. Symmetrical waist holes are formed on the second angle steel 3022, and a fifth cylinder is installed on the lower surface of each waist hole. The fifth cylinder is slidably connected to the lower surface of the waist hole, and a second clamping plate 3023 is connected to the lower end of the fifth cylinder. The output end of the fifth cylinder passes through the second clamping plate 3023 and is connected to a pressure plate. In this embodiment, the second angle steel 3022, the fifth cylinder, the second clamping plate 3023, and the pressure plate are all present. The structure and function of the first angle steel 205, the second cylinder 2051, the first clamping plate 2053, and the pressure plate are exactly the same. Therefore, the upper surface of the fifth cylinder is also provided with a butterfly bolt 2052, or a component with the same function as the butterfly bolt 2052, so that the second cylinder 2051 can be fixed at any point on the waist hole of the second angle steel 3022. The second angle steel 3022 on the front surface of the sleeper is provided with an adjustable second clamping plate 3023 structure, which can assist in fixing the paper during the cutting process and can be easily loosened after cutting, which is conducive to the smooth storage of the paper.

[0037] See Figure 7 On the other side of the upper surface of the second mounting plate 301, multiple sets of sliding grooves are symmetrically formed. Adjusting blocks 303 are slidably connected within these grooves. The adjusting blocks 303 are arranged in a rectangular pattern on the second mounting plate 301. Each adjusting block 303 has a stop post 3031. Multiple screw holes are formed at the bottom of the sliding groove, and each adjusting block 303 has a stud threadedly connected to one of the screw holes. The studs and screw holes allow the adjusting blocks 303 to be fixed at any point on the sliding groove. In this embodiment, the sliding of the adjusting blocks 303 within the sliding groove and their fixing by the studs and screw holes allows for adjustment according to the paper... The position of the size adjustment stop 3031 serves to position the edge of the paper, further ensuring the accuracy of cutting. Furthermore, in this embodiment, a fourth cylinder 3041 is provided at the center of the lower surface of the second mounting plate 301. The output end of the fourth cylinder 3041 passes through the second mounting plate 301 and is connected to a support plate 304. The support plate 304 is located between the stop 3031. After cutting, the support plate 304 can rise under the drive of the fourth cylinder 3041 to lift the cut paper, facilitating subsequent storage operations.

[0038] The above description, in conjunction with specific embodiments, provides a further detailed explanation of the present invention. It should not be construed that the specific implementation of the present invention is limited to these descriptions. For those skilled in the art, several simple deductions or substitutions can be made without departing from the concept of the present invention, and all such deductions or substitutions should be considered to fall within the scope of protection defined by the claims submitted herein.

Claims

1. A packaging paperboard cutting mechanism, comprising a support (100), wherein the upper surface of the support (100) is equipped with a paper feeding mechanism (200) and a cut paper storage mechanism (300), the paper feeding mechanism (200) and the cut paper storage mechanism (300) are arranged opposite to each other on the upper surface of the support (100), and one end of the support (100) is equipped with a paper roll placement roller (101), Features: The paper feeding mechanism (200) comprises a first mounting plate (201) fixedly arranged on the upper surface of the bracket (100); four corners of the upper surface of the first mounting plate (201) are provided with upright posts (2022); the upper ends of the upright posts (222) are provided with a fixing plate (203); a telescopic rod (204) is centrally arranged on the fixing plate (203); the output end of the telescopic rod (204) is connected to a connecting piece (2041); and pneumatic clamps (2042) are installed on both sides of the lower end of the connecting piece (2041); The paper cutter storage mechanism (300) comprises a second mounting plate (301) fixedly arranged on the upper surface of the bracket (100); a knife holder (302) is provided on the upper surface of the second mounting plate (301) and on a side close to the paper feeding mechanism (200); a cutter (3021) is slidably connected to the inner side of the knife holder (302); a plurality of adjustment blocks (303) are slidably connected to the other side of the upper surface of the second mounting plate (301); the adjustment blocks (303) are arranged in a rectangular shape on the second mounting plate (301); and a stop column (3031) is provided on the adjustment block (303).

2. The packaging cardboard cutting mechanism according to claim 1, characterized in that: Both ends of the first mounting plate (201) are mounted with first angle steels (205), waist holes are symmetrically provided on the first angle steel (205), a second cylinder (2051) is mounted on the lower surface of the waist hole, a butterfly bolt (2052) is provided on the upper surface of the second cylinder (2051), the butterfly bolt (2052) passes through the waist hole, and the butterfly bolt (2052) is rotated clockwise so that the second cylinder (2051) is fixed at any point of the waist hole, the lower end of the second cylinder (2051) is connected with a first clamp (2053), and the output end of the second cylinder (2051) passes through the first clamp (2053) and is connected with a pressing plate.

3. The packaging cardboard cutting mechanism according to claim 2, characterized in that: A paper pressing roller (2031) is mounted on one end of the first mounting plate (201) close to the paper roll placement roller (101); the paper pressing roller (2031) is mounted on the end of the first mounting plate (201) via a roller frame; the roller frame is fixed on both sides of the first mounting plate (201) close to one end of the paper roll placement roller (101).

4. The method according to claim 2, characterized in that: The length of the lower end of the connecting piece (2041) is equal to the length of the first angle steel (205), and adjustment holes are symmetrically opened on both sides of the lower end of the connecting piece (2041), and the length of the adjustment holes is equal to the length of the waist hole. The pneumatic clamp (2042) is slidably connected to the adjustment hole by bolts, and the bolts are turned so that the pneumatic clamp (2042) is fixed at any position on the adjustment hole.

5. The packaging cardboard cutting mechanism according to claim 1, characterized in that: A first cylinder (202) is installed on the lower surface of the first mounting plate (201); an output end of the first cylinder (202) passes through the first mounting plate (201) and is connected to a lifting plate (2021); and columns (2022) are provided at four corners of the lower surface of the lifting plate (2021); the columns (2022) pass through the first mounting plate (201) and extend downward.

6. The packaging cardboard cutting mechanism according to claim 1, characterized in that: A third cylinder (30211) is installed on the lower surface of the second mounting plate (301), and an output end of the third cylinder (30211) passes through the second mounting plate (301) and is connected to the lower surface of the cutter (3021). A sleeper is installed on the top of the knife holder (302), and when the cutter (3021) moves upward through the second mounting plate (301), the blade contacts the lower surface of the sleeper.

7. The packaging cardboard cutting mechanism according to claim 6, characterized in that: A second angle steel (3022) is installed on the front surface of the sleeper, and waist holes are symmetrically opened on the second angle steel (3022). A fifth cylinder is installed on the lower surface of the waist hole, and the fifth cylinder is slidably connected to the lower surface of the waist hole. The lower end of the fifth cylinder is connected to a second clamping piece (3023), and the output end of the fifth cylinder passes through the second clamping piece (3023) and is connected to a pressing piece.

8. The packaging cardboard cutting mechanism according to claim 1, characterized in that: A plurality of groups of slide grooves are symmetrically provided on the other side of the upper surface of the second mounting plate (301), and the adjusting block (303) is slidably connected in the slide grooves. A plurality of screw holes are provided at the bottom of the slide grooves, and studs are provided on the adjusting block (303) and are threadedly connected to the screw holes, so that the adjusting block (303) can be fixed at any position on the slide grooves through the studs and the screw holes.

9. The packaging cardboard cutting mechanism according to claim 8, characterized in that: A fourth cylinder (3041) is provided at the center of the lower surface of the second mounting plate (301); an output end of the fourth cylinder (3041) passes through the second mounting plate (301) and is connected to a support plate (304); the support plate (304) is located between the blocking columns (3031).

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