Full-automatic punching device for paperboard

Abstract

The application discloses a kind of full-automatic punching equipment for paperboard, it is related to paperboard production and processing field, solve the problem that cutting tool of punching equipment can cause paperboard paper skin damage, including two symmetrical distribution shelf plate, and the outside of two shelf plates is fixedly installed with support foot, paperboard is equipped between two shelf plates, the cutting tool is designed in the bottom of slide bar in the application, can make cutting tool move downward in high-speed rotation process, when the bottom of cutting tool is contacted with the upper surface of paperboard, can directly cut paperboard and punch, and when continuously moving downward, due to the effect of down pressure foot, it can ensure that paperboard will not pull the lower paper skin of paperboard when punching, cause paper skin damage to affect the overall appearance of paperboard, and in the high-speed rotation process of slide bar, the air outside can quickly enter into the inside of slide bar through air inlet, and blow out through the bottom of slide bar, the purpose of doing this can blow the paper scrap generated by cutting and punching downward.

Description

Technical Field

[0001] This invention relates to the field of paperboard production and processing, specifically to a fully automatic punching device for paperboard. Background Technology

[0002] Paper packaging box processing is actually the processing of cardboard folded into packaging boxes. Due to the packaging requirements of the items, some packaging boxes need to be perforated, that is, the cardboard needs to be perforated. Nowadays, the perforation of cardboard is automated, and there is no need for manual perforation.

[0003] Chinese patent CN107696148B discloses a cardboard punching device. The device uses a first, second, and third power roller conveyor belt connected in sequence to transport the cardboard. When the cardboard passes the second power roller conveyor belt, it is blocked by a blocking mechanism. A lifting device then lifts the cardboard to prevent displacement during the subsequent punching process due to the influence of the second power roller conveyor belt. After being lifted, two swing arm groups are driven by cylinders to rotate their respective swing arm groups inwards, causing the punching mechanism located at the lower end of the swing arm to clamp the edge of the cardboard. The punching mechanism then punches the cardboard. This invention uses two swing arm groups, totaling four swing arms, i.e., four punching mechanisms, to perform punching operations at four positions on the cardboard, avoiding the efficiency and accuracy reduction problems caused by multiple positioning operations when punching cardboard with a single punching device.

[0004] In the aforementioned technology, a drive motor causes a fork to swing, which in turn presses down on the punching blade through the outer ring, causing the blade to cut the cardboard. This method of punching holes in the cardboard by pressing down on the punching blade creates a small indentation on the cardboard surface. As the punching blade continues to move downwards to cut the hole, it pushes down on the lower layer of cardboard, which can easily cause minor tearing of the lower layer and affect the overall appearance of the cardboard. To address this, we propose a fully automatic punching device for cardboard. Summary of the Invention

[0005] The purpose of this invention is to provide a fully automatic punching device for cardboard that can accurately punch holes in cardboard without causing damage to the cardboard or paperboard, so as to solve the problems mentioned in the background art.

[0006] To achieve the above objectives, the present invention provides the following technical solution: a fully automatic punching device for cardboard, comprising two symmetrically distributed frame plates, with support feet fixedly installed on the outer sides of both frame plates. Cardboard is disposed between the two frame plates. Two sets of symmetrically distributed motors are fixedly installed on the upper part of the frame plates via mounting clips, each set containing several motors. An axial displacement device is fixedly installed between the mounting clips of the same set. Two rows of opposing fans are correspondingly installed on the bottom of the cardboard, and the fans deliver... The airflow direction is from the outside of the shelf towards the symmetrical line of the cardboard. Two sets of fans are located on the left and right sides of the two shelves. During the punching operation, air is blown towards the upper part of the negative pressure mechanism to blow away the paper pieces cut off from the upper part of the negative pressure mechanism. The punching mechanism, which punches the cardboard, is installed at the output end of the motor, and a support mechanism is provided at the bottom of the cardboard corresponding to the lower part of the punching mechanism. The rocker arm assembly, which moves with the operation of the punching mechanism, actuates the support mechanism. The rocker arm assembly is installed between the punching mechanism and the support mechanism.

[0007] Preferably, the punching mechanism includes a rotating shaft fixedly installed at the output end of the motor, and a sleeve is slidably sleeved on the outside of the rotating shaft. A sliding rod is fixedly installed at the bottom of the rotating shaft and slidably fitted with the sleeve. A plurality of cutters equidistantly distributed in a circle are fixedly installed on the lower end face of the sliding rod. When the motor drives the sliding rod and cutters to rotate rapidly and move downward, it can perform a rotary cut on the cardboard. A sliding piece is fixedly sleeved on the outer surface of the sliding rod and slidably fitted with the sleeve. A spring is provided at the lower end of the sliding piece. An upper pressure foot is fixedly sleeved on the bottom periphery of the sleeve. Two retaining posts that slidably fit with the mounting buckle are fixedly installed at the upper end of the upper pressure foot. A cutting hole is opened inside the upper pressure foot, and the inner diameter of the cutting hole is consistent with the outer diameter of the outer tangent circle of the plurality of cutters.

[0008] Preferably, the slide rod and the rotating shaft have through holes inside, and the top of the rotating shaft has several air inlets connected to the through holes. The inner wall of the slide rod is fixedly equipped with several blades that are equidistantly distributed in a circle. When the slide rod rotates rapidly, the blades rotate rapidly with the slide rod, making the pressure difference inside the slide rod less than the pressure difference outside. That is, when cutting the paperboard, outside air can enter the interior of the slide rod through the air inlets and blow air downwards onto the cut paper.

[0009] Preferably, the supporting mechanism includes a lower presser foot that fits against the bottom of the cardboard, and the lower presser foot is fixedly connected to the frame plate. The lower presser foot and the upper presser foot have the same structural size. By restricting the cardboard with the upper and lower presser feet, the cardboard can be stably perforated. The height of the cutter is greater than the thickness of the cardboard, and the bottom of the lower presser foot is provided with a negative pressure mechanism.

[0010] Preferably, the negative pressure mechanism includes a sleeve fixedly installed at the bottom of the lower pressure foot, and a chuck is slidably embedded inside the sleeve. A hollow rod is fixedly installed inside the chuck, and a suction cup is connected to the top of the hollow rod. A sliding plate is slidably sleeved on the outer surface of the hollow rod, and a second spring is fixedly installed between the sliding plate and the chuck. When the sliding plate slides upward, the hollow rod can be moved upward as a whole by the second spring. A limiting component is provided at the bottom of the hollow rod.

[0011] Preferably, the rocker arm assembly includes a pressure rod fixedly installed at the lower end of the mounting buckle, and a limiting rod is fixedly provided at the bottom of the lower pressure foot. A rocker arm is rotatably provided on the outside of the limiting rod via a connecting shaft. The rocker arm is double-rod shaped. The end of the rocker arm near the pressure rod is movably fitted with the lower end face of the pressure rod. The side of the rocker arm away from the pressure rod is slidably sleeved on the outside of the hollow rod. The bottom of the sliding plate is slidably fitted with the outer surface of the rocker arm. When the pressure rod moves downward and presses down on the rocker arm, the other end of the rocker arm can push the sliding plate upward.

[0012] Preferably, the limiting component includes a fixed rod fixedly installed on the outside of the sleeve. A limiting cavity is formed inside the hollow rod, and the lower end of the limiting cavity is conical. A limiting ball is fixedly installed inside the limiting cavity by a spring, and the limiting ball is fitted into the conical opening at the lower end of the limiting cavity. A support rod is slidably provided at the bottom of the hollow rod through a hollow frame, and an arc-shaped toothed support block is fixedly installed at the upper end of the support rod. The hollow frame is designed to allow the limiting cavity to communicate with the outside. The outer diameter of the limiting ball is the same as the inner diameter of the arc-shaped toothed support block. The bottom of the support rod is fixedly connected to the fixed rod through a fixing plate.

[0013] Preferably, the inner diameter of the sleeve is smaller than the inner diameter of the cutting hole, so that when the suction cup moves upward and fits against the lower end of the cardboard, the deformation of the suction cup will not exceed the inner diameter of the cutting hole. The upper horizontal sectional surface of the suction cup is lower than the upper end surface of the sleeve, so that when the suction cup is reset, the height difference between the top surface of the suction cup and the sleeve can separate the paper from the cut edge.

[0014] Preferably, the rotation point of the limiting rod and the rocker arm is close to the side of the pressure rod, so that when the pressure rod moves down slightly, the other end of the rocker arm can slide the slide plate up significantly.

[0015] Preferably, the limiting ball is made of rubber, and a counterweight base is fixedly sleeved at the bottom of the hollow rod. The counterweight base is designed to ensure that the hollow rod can stretch the spring through the support rod when it is not in a perforated state.

[0016] Compared with the prior art, the beneficial effects of the present invention are:

[0017] This invention features a cutter at the bottom of the slide bar, allowing it to move downwards during high-speed rotation. Once the bottom of the cutter contacts the upper surface of the cardboard, it can directly cut and punch holes in the cardboard. As it continues to move downwards, the pressure foot prevents the cardboard from being pulled or damaged during punching, thus maintaining the overall aesthetics of the cardboard. During the high-speed rotation of the slide bar, outside air can quickly enter through the air inlet and be blown out through the bottom of the slide bar, thus blowing away the paper scraps generated during cutting and punching downwards. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the overall structure of the present invention;

[0019] Figure 2 This is a schematic diagram of the overall structure of the present invention from another perspective;

[0020] Figure 3 This is a schematic diagram of the lower pressure foot and sleeve structure of the present invention;

[0021] Figure 4 This is a schematic diagram of the internal structure of the sleeve and sleeve frame of the present invention;

[0022] Figure 5 This is a schematic diagram of the blade structure of the present invention;

[0023] Figure 6 This is a schematic diagram of the slide and rocker arm structure of the present invention;

[0024] Figure 7 This is a schematic diagram of the internal structure of the hollow rod of the present invention;

[0025] Figure 8 This is a schematic diagram of the internal structure of the limiting cavity of the present invention.

[0026] In the diagram: 1. Shelf; 2. Support leg; 3. Cardboard; 4. Motor; 5. Mounting buckle; 6. Punching mechanism; 7. Supporting mechanism; 8. Negative pressure mechanism; 9. Rocker arm assembly; 10. Limiting assembly; 11. Rotating shaft; 12. Sleeve; 13. Sliding plate; 14. Spring 1; 15. Sliding rod; 16. Cutter; 17. Holding post; 18. Upper pressure foot; 19. Lower pressure foot; 20. Sleeve; 21. Hollow rod; 22. Chuck; 23. Suction cup; 24. Sliding plate; 25. Spring 2; 26. Rocker arm; 27. Pressure rod; 28. Limiting rod; 29. ​​Fixing rod; 30. Through hole; 31. Air inlet; 32. Blade; 33. Counterweight base; 34. Limiting cavity; 35. Spring 3; 36. Limiting ball; 37. Support rod. Detailed Implementation

[0027] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0028] Example 1

[0029] Please see Figure 1 and Figure 2 The diagram shows a fully automatic cardboard punching device, comprising two symmetrically distributed frame plates 1, with support feet 2 fixedly installed on the outer sides of each frame plate 1. A cardboard 3 is placed between the two frame plates 1. Two sets of symmetrically distributed motors 4 are fixedly installed on the upper part of the frame plates 1 via mounting clips 5. Each set of motors 4 contains several motors, and an axial displacement device is fixedly installed between the mounting clips 5 of the same set. Two rows of opposing fans are installed at the bottom of the cardboard 3, with the fans blowing air in the direction of the frame plates 1. The outer side is conveyed towards the symmetrical line of the cardboard 3. Two sets of fans are located on the left and right sides of the two racks 1. During the punching operation, air is blown towards the upper part of the negative pressure mechanism 8 to blow away the paper pieces cut off from the upper part of the negative pressure mechanism 8. The punching mechanism 6, which punches the cardboard 3, is installed at the output end of the motor 4, and the bottom of the cardboard 3 is provided with a support mechanism 7 below the punching mechanism 6. The rocker arm assembly 9, which moves the support mechanism 7 along with the operation of the punching mechanism 6, is installed between the punching mechanism 6 and the support mechanism 7.

[0030] Please see Figure 3 and Figure 4 The punching mechanism 6 shown in the figure includes a rotating shaft 11 fixedly installed at the output end of the motor 4, and a sleeve 12 is slidably sleeved on the outside of the rotating shaft 11. A slide rod 15 is fixedly installed at the bottom of the rotating shaft 11 and slidably fitted with the sleeve 12. Several cutters 16 are fixedly installed on the lower end face of the slide rod 15 and are circumferentially distributed. When the motor 4 drives the slide rod 15 and the cutters 16 to rotate rapidly and move downward, it can perform a rotary cut on the cardboard 3. A slide piece 13 is fixedly sleeved on the outer surface of the slide rod 15 and slidably fitted with the sleeve 12. A spring 14 is provided at the lower end of the slide piece 13. An upper pressure foot 18 is fixedly sleeved on the bottom periphery of the sleeve 12. Two retaining posts 17 are fixedly installed at the upper end of the upper pressure foot 18 and slidably fitted with the mounting buckle 5. A cutting hole is opened inside the upper pressure foot 18, and the inner diameter of the cutting hole is consistent with the outer diameter of the outer tangent circle of the several cutters 16.

[0031] Please see Figure 5As shown in the figure, the slide rod 15 and the rotating shaft 11 have through holes 30 inside. The top of the rotating shaft 11 has several air inlets 31 that are connected to the through holes 30. Several blades 32 that are equidistantly distributed in a circle are fixedly installed on the inner wall of the slide rod 15. When the slide rod 15 rotates rapidly, the blades 32 rotate rapidly with the slide rod 15, making the pressure difference inside the slide rod 15 less than the pressure difference outside. That is, when cutting the paperboard 3, outside air can enter the interior of the slide rod 15 through the air inlets 31 and blow air downwards on the cut paper.

[0032] The working principle of precisely punching holes in cardboard without damaging the cardboard is as follows: The existing conveying device conveys the cardboard 3. When a hole needs to be punched during conveying, the axial displacement component causes the mounting buckle 5 to move downward with the motor 4. During the movement, since the bottom of the upper pressure foot 18 is already in contact with the cardboard 3, the motor 4 continues to move downward, which compresses the spring 14. The elastic force generated by the spring 14 can make the upper pressure foot 18 press against the upper surface of the cardboard 3, ensuring the stability of the punching. When the bottom of the cutter 16 contacts the upper end face of the cardboard 3, it can directly cut the cardboard 3, and the shape is hole-shaped. When the slide bar 15 rotates at high speed, the action of the blade 32 can make the external air pressure greater than the internal air pressure of the slide bar 15, so that the external air is compressed into the interior of the slide bar 15 and discharged from the lower end of the slide bar 15. The internal airflow of the slide bar 15 generates a downward wind force, which can make the cut paper pieces detach from the cardboard 3.

[0033] Example 2

[0034] Please see Figure 5 and Figure 6 This embodiment further explains Example 1. The supporting mechanism 7 includes a lower presser foot 19 that is attached to the bottom of the cardboard 3. The lower presser foot 19 is fixedly connected to the frame plate 1. The lower presser foot 19 and the upper presser foot 18 have the same structural size. By restricting the cardboard 3 through the upper presser foot 18 and the lower presser foot 19, the cardboard 3 can be stably punched. The height of the cutter 16 is greater than the thickness of the cardboard 3. The bottom of the lower presser foot 19 is provided with a negative pressure mechanism 8.

[0035] Please see Figure 6 and Figure 7 The negative pressure mechanism 8 includes a sleeve 20 fixedly installed at the bottom of the lower pressure foot 19, and a chuck 22 is slidably embedded inside the sleeve 20. A hollow rod 21 is fixedly installed inside the chuck 22, and a suction cup 23 is connected to the top of the hollow rod 21. A sliding plate 24 is slidably sleeved on the outer surface of the hollow rod 21, and a second spring 25 is fixedly installed between the sliding plate 24 and the chuck 22. When the sliding plate 24 slides upward, the hollow rod 21 can be moved upward as a whole through the second spring 25. A limiting component 10 is provided at the bottom of the hollow rod 21.

[0036] The rocker arm assembly 9 includes a pressure rod 27 fixedly installed at the lower end of the mounting buckle 5, and a limiting rod 28 fixedly provided at the bottom of the lower pressure foot 19. A rocker arm 26 is rotatably provided on the outside of the limiting rod 28 via a connecting shaft. The rocker arm 26 is double-rod shaped. The end of the rocker arm 26 near the pressure rod 27 is movably fitted with the lower end surface of the pressure rod 27. The side of the rocker arm 26 away from the pressure rod 27 is slidably sleeved on the outside of the hollow rod 21, and the bottom of the slide plate 24 is slidably fitted with the outer surface of the rocker arm 26. When the pressure rod 27 moves downward and presses down on the rocker arm 26, the other end of the rocker arm 26 can push the slide plate 24 upward.

[0037] Please see Figure 7 The rotation points of the limit rod 28 and the rocker arm 26 are close to the side of the pressure rod 27, ensuring that when the pressure rod 27 moves down slightly, the other end of the rocker arm 26 can slide the slide plate 24 up significantly.

[0038] In this embodiment: when the mounting buckle 5 moves downward with the motor 4, the pressure rod 27 can squeeze the rocker arm 26, causing the other end of the rocker arm 26 to move the slide plate 24 upward. During the upward movement, the slide plate 24 first slides the hollow rod 21 upward through the action of the second spring 25 until the suction cup 23 contacts the lower end face of the cardboard 3. During the continuous upward movement of the slide plate 24, the second spring 25 can be compressed, and the second spring 25 can apply pressure to the suction cup 23, squeezing out some of the air between the suction cup 23 and the lower end face of the cardboard 3. At this time, the suction cup 23 adsorbs and applies pressure to the bottom of the punching point, which can ensure the punching stability of the cutter 16 on the cardboard 3, and further prevent the cutter 16 from pulling the lower layer of the cardboard 3 and causing it to break when it continues to move downward.

[0039] It should be noted that when the motor 4 moves downward, its suction cup 23 can contact the cardboard 3 earlier than the cutter 16.

[0040] Example 3

[0041] Please see Figure 8 This embodiment further illustrates other embodiments. The limiting component 10 includes a fixed rod 29 fixedly installed on the outside of the sleeve 20. A limiting cavity 34 is opened inside the hollow rod 21, and the lower end of the limiting cavity 34 is conical. A limiting ball 36 is fixedly installed inside the limiting cavity 34 by a spring 35, and the limiting ball 36 is fitted with the lower conical opening of the limiting cavity 34. A support rod 37 is slidably provided at the bottom of the hollow rod 21 through a hollow frame, and an arc-shaped toothed support block is fixedly installed at the upper end of the support rod 37. The hollow frame is designed to make the limiting cavity 34 communicate with the outside. The outer diameter of the limiting ball 36 is the same as the inner diameter of the arc-shaped toothed support block. The bottom of the support rod 37 is fixedly connected to the fixed rod 29 through a fixed plate.

[0042] Please see Figure 8The limiting ball 36 is made of rubber, and the bottom of the hollow rod 21 is fixedly fitted with a counterweight base 33. The counterweight base 33 is designed to ensure that the hollow rod 21 can stretch the spring 35 through the support rod 37 when it is not in a drilling state.

[0043] Please see Figure 7 and Figure 8 The inner diameter of the sleeve 20 is smaller than the inner diameter of the cutting hole, ensuring that when the suction cup 23 moves upward and fits against the lower end face of the cardboard 3, the deformation of the suction cup 23 will not exceed the inner diameter of the cutting hole, and the upper horizontal sectional surface of the suction cup 23 is lower than the upper end face of the sleeve 20.

[0044] In this embodiment: during the punching process, when the hollow rod 21 moves upward, its support rod 37 slides downward. When the hollow rod 21 has not moved to the uppermost position, its support rod 37 no longer contacts the limiting ball 36. That is, under the action of the spring 35, the limiting ball 36 blocks the lower end of the limiting cavity 34. At this time, the lower end of the hollow rod 21 is in a closed state. When the hollow rod 21 continues to move upward, it discharges some of the air between the suction cup 23 and the lower end face of the cardboard 3, so that it forms a negative pressure and adsorbs the lower end face of the punching position of the cardboard 3.

[0045] When the hollow rod 21 returns to its original position after punching, it initially attracts the paper pieces after punching the cardboard 3 and moves them downwards due to the negative pressure. As it continues to move downwards, the weight of the hollow rod 21 and the counterweight base 33 causes the support rod 37 to push the limiting ball 36 upwards, so that the bottom of the hollow rod 21 is no longer closed. After air enters the suction cup 23, it will no longer attract the paper pieces. In this way, it can be ensured that the waste paper pieces generated by punching can be stably removed from the cardboard 3 and will not be left inside the cardboard 3.

[0046] The height difference between the suction cup 23 and the top surface of the sleeve 20 causes the suction cup 23 to separate from the paper at the cutting edge when it returns to its downward position. At this time, the paper is blown away from the top of the sleeve 20 by the action of the fan.

[0047] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0048] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A full-automatic punching device for paperboard, comprising two frame plates (1) symmetrically distributed, support feet (2) fixedly installed on the outer sides of the two frame plates (1), paperboard (3) arranged between the two frame plates (1), and two groups of electric motors (4) symmetrically distributed fixedly installed on the upper portions of the frame plates (1) through mounting buckles (5), wherein the number of the electric motors (4) in each group is several, and one axial displacement device is jointly fixedly installed between the several mounting buckles (5) in the same group. The bottom of the paperboard (3) is correspondingly provided with two rows of fans which are oppositely distributed, and the air supply direction of the fans is to the outside of the shelf plate (1) to the direction of the symmetry line of the paperboard (3); The punching mechanism (6) is installed on the output end of the motor (4), and the bottom of the paperboard (3) is correspondingly provided with a supporting mechanism (7) below the punching mechanism (6), the supporting mechanism (7) comprises a downholder (19) which is attached to the bottom of the paperboard (3), the bottom of the downholder (19) is provided with a negative pressure mechanism (8), the negative pressure mechanism (8) comprises a sleeve (20) which is fixedly installed on the bottom of the downholder (19), the inside of the sleeve (20) is slidably embedded with a chuck (22), the inside of the chuck (22) is fixedly installed with a hollow rod (21), the top of the hollow rod (21) is connected with a suction cup (23), the outer surface of the hollow rod (21) is slidably sleeved with a sliding disc (24), the sliding disc (24) and the chuck (22) are fixedly installed with a spring (25), and the bottom of the hollow rod (21) is provided with a limiting assembly (10). The upturned rod assembly (9) is installed between the punching mechanism (6) and the supporting mechanism (7), the upturned rod assembly (9) comprises a pressure rod (27) which is fixedly installed on the lower end of the mounting buckle (5), the bottom of the downholder (19) is fixedly provided with a limiting rod (28), the outer portion of the limiting rod (28) is rotatably provided with an upturned rod (26) through a connecting shaft, the upturned rod (26) is double-rod-shaped, one end of the upturned rod (26) close to the pressure rod (27) is movably attached to the lower end surface of the pressure rod (27), and the other side of the upturned rod (26) away from the pressure rod (27) is slidably sleeved on the outside of the hollow rod (21), and the bottom of the sliding disc (24) is slidably attached to the outer surface of the upturned rod (26).

2. A full-automatic punching device for paperboard according to claim 1, characterized in that: The punching mechanism (6) comprises a rotating shaft (11) which is fixedly installed on the output end of the motor (4), the outside of the rotating shaft (11) is slidably sleeved with a sleeve (12), the bottom of the rotating shaft (11) is fixedly installed with a sliding rod (15) which is slidably embedded with the sleeve (12), the lower end surface of the sliding rod (15) is fixedly installed with a plurality of cutting knives (16) which are circumferentially and equidistantly distributed, the outer surface of the sliding rod (15) is fixedly sleeved with a sliding sheet (13) which is slidably embedded with the sleeve (12), the lower end of the sliding sheet (13) is provided with a spring (14), the bottom of the sleeve (12) is peripherally fixedly sleeved with an upper pressure foot (18), the upper end of the upper pressure foot (18) is fixedly installed with two retaining columns (17) which are slidably embedded with the mounting buckle (5), the inside of the upper pressure foot (18) is provided with a cutting hole, and the inner diameter of the cutting hole is consistent with the outer diameter of the outer cutting circle of the plurality of cutting knives (16).

3. A full automatic punching device for paperboard according to claim 2, characterized in that: The slide rod (15) and the inside of the rotating shaft (11) are provided with a through hole (30), the top of the rotating shaft (11) is provided with a plurality of air inlet holes (31) communicated with the through hole (30), and the inner wall of the slide rod (15) is fixedly installed with a plurality of blades (32) distributed at equal intervals in a circle.

4. A full-automatic punching device for paperboard according to claim 2, characterized in that: The lower pressing foot (19) is fixedly connected with the frame plate (1), the structure and size of the lower pressing foot (19) are consistent with those of the upper pressing foot (18), and the height of the cutter (16) is greater than the thickness of the paperboard (3).

5. A full automatic punching device for paperboard according to claim 4, characterized in that: The limiting assembly (10) comprises a fixed rod (29) fixedly installed on the outer side of the sleeve frame (20), a limiting cavity (34) is formed in the inside of the hollow rod (21), the lower end of the limiting cavity (34) is tapered, a limiting ball (36) is fixedly arranged in the inside of the limiting cavity (34) through a spring three (35), the limiting ball (36) is embedded in the tapered lower end of the limiting cavity (34), an arc-shaped toothed supporting block is fixedly installed on the upper end of a supporting rod (37) slidably arranged on the bottom of the hollow rod (21) through a hollow frame, the outer diameter of the limiting ball (36) is consistent with the inner diameter of the arc-shaped toothed supporting block, and the bottom of the supporting rod (37) is fixedly connected with the fixed rod (29) through a fixed plate.

6. A full automatic punching device for paperboard according to claim 4, characterized in that: The inner diameter of the sleeve frame (20) is smaller than the inner diameter of the cutting hole, and the upper end horizontal surface of the suction disc (23) is lower than the upper end surface of the sleeve frame (20).

7. A full automatic punching device for paperboard according to claim 4, characterized in that: The rotation point of the limiting rod (28) and the tilting rod (26) is close to one side of the pressing rod (27).

8. A full automatic punching device for paperboard according to claim 5, characterized in that: The limiting ball (36) is made of rubber material, and a counterweight base (33) is fixedly sleeved on the bottom of the hollow rod (21).

Images