Honeycomb paperboard sandwich layer trepanning device and trepanning method thereof

Abstract

The invention belongs to the technical field of honeycomb paperboard processing, and particularly relates to a honeycomb paperboard sandwich layer trepanning device and a trepanning method.The honeycomb paperboard sandwich layer trepanning device comprises a U-shaped frame, a punching roller and a paper guide roller, the punching roller and the paper guide roller are rotationally arranged in the U-shaped frame, a plurality of evenly-distributed steel needles are detachably arranged on the roller wall of the punching roller, and the paper guide roller is of a hollow structure; a plurality of needle holes which are uniformly distributed are formed in the roller wall of the paper guide roller, and the hole opening detection mechanism is arranged on the side wall of the U-shaped frame. Through cooperative cooperation of the tapping detection mechanism, the dust collection mechanism and the marking mechanism, real-time detection of the tapping quality of the honeycomb paperboard sandwich layer, synchronous cleaning of tapping chippings and paperboard surface impurities and marking of the punching failure position are achieved, the tapping machining quality and detection efficiency are effectively improved, and the production efficiency is improved. The steel needle breakage rate and the equipment fault occurrence rate are reduced, the problem position can be quickly positioned, and invalid manual operation is reduced.

Description

Technical Field

[0001] This invention belongs to the field of honeycomb paperboard processing technology, and in particular relates to a honeycomb paperboard core layer opening device and opening method. Background Technology

[0002] Honeycomb paperboard, with its lightweight, compression resistance, and excellent cushioning properties, is widely used in packaging, logistics, building materials, and other fields. To meet practical needs such as breathability, weight reduction, and threading, it is often necessary to perform perforation processing on its core layer. Roller-pressed piercing perforation devices have become the mainstream equipment for perforating the core layer because they can adapt to the continuous production rhythm of honeycomb paperboard. This type of device mainly uses a perforating roller with steel needles and a paper guide roller to work together to complete the perforation operation of the core layer by using the roller pressing and piercing action of the steel needles, such as the honeycomb paperboard core layer perforation device and perforation method disclosed in announcement number CN110788929A.

[0003] However, when the steel needles of the existing roller-pressed piercing perforation device pierce the honeycomb paperboard, on the one hand, the steel needles need to withstand the squeezing force of the honeycomb wall of the core layer and the piercing resistance of the face paper. If the rigidity and hardness of the steel needle material are insufficient, the steel needles are prone to bending and breaking under the continuous roller pressing impact and irregular radial resistance. On the other hand, if the matching parameters of the perforating roller and the paper guide roller are not properly adjusted, or if there is a deviation in the design of the paper guide roller's clearance structure, the steel needles are prone to indirect contact or collision with the paper guide roller during the piercing process, which further aggravates the breakage and damage of the steel needles. The broken steel needles cannot be identified and replaced in time and will continue to participate in the perforation operation, resulting in a low effective through-hole ratio in the product, which cannot meet the basic functional requirements of perforation for subsequent use.

[0004] To address this, a perforation device and method for the core layer of honeycomb paperboard are proposed. Summary of the Invention

[0005] The purpose of this invention is to address the above-mentioned problems by providing a device and method for opening holes in the core layer of honeycomb paperboard.

[0006] To achieve the above objectives, the present invention adopts the following technical solution: a perforation device for a honeycomb paperboard core layer, comprising a U-shaped frame and a perforating roller and a guide roller rotatably disposed inside the U-shaped frame, wherein the roller wall of the perforating roller is detachably provided with a plurality of evenly distributed steel needles, the guide roller has a hollow structure, and the roller wall of the guide roller is provided with a plurality of evenly distributed needle holes, and further comprising:

[0007] An opening detection mechanism is set on the side wall of the U-shaped frame, and the suction end of the opening detection mechanism extends into the interior of the paper guide roller and is set in accordance with the position of the pinhole. The opening detection mechanism determines whether the honeycomb paperboard core has been opened according to the suction intensity.

[0008] A dust collection mechanism is installed inside the U-shaped frame and is located on both sides of the gap between the perforating roller and the paper guide roller. The dust collection mechanism is connected to the perforation detection mechanism and is used to clean up the dust generated during the conveying of the honeycomb cardboard core.

[0009] A marking mechanism is provided on one side of the vacuuming mechanism, and the marking mechanism is used to mark the unperforated section of the honeycomb cardboard core;

[0010] The PLC controller is fixedly mounted on the side wall of the U-shaped frame, and the hole detection mechanism, dust collection mechanism and marking mechanism are all electrically connected to the PLC controller.

[0011] Preferably, a motor is fixedly mounted on one side of the U-shaped frame, and the output end of the motor is fixedly connected to one side of the rotating shaft of the punching roller. Gears are fixedly mounted on the other side of the rotating shafts of the punching roller and the paper guide roller. The two gears are meshed together, and the motor is electrically connected to the PLC controller.

[0012] Preferably, the positions of the plurality of steel needles correspond one-to-one with the positions of the plurality of needle holes, and the roller wall of the paper guide roller is provided with needle avoidance grooves at the positions corresponding to the positions of the plurality of needle holes.

[0013] Preferably, the hole detection mechanism includes a vacuum cleaner fixedly mounted on the side wall of the U-shaped frame. The input end of the vacuum cleaner is fixedly provided with a first suction pipe. The rotating shaft of the paper guide roller has a hollow structure, and a rotating pipe joint is fixedly provided at one end of the rotating shaft of the paper guide roller. One end of the first suction pipe is fixedly connected to the rotating pipe joint. Multiple evenly distributed second suction pipes are fixedly arranged around the rotating shaft of the paper guide roller. A third suction pipe is horizontally fixed at one end of each of the multiple second suction pipes. Multiple evenly distributed fourth suction pipes are fixedly arranged on the pipe walls of the multiple third suction pipes. The positions of the multiple fourth suction pipes correspond to the positions of the multiple pinholes. Pressure gauges are fixedly arranged on the pipe walls of the multiple second suction pipes.

[0014] Preferably, the dust collection mechanism includes a first dust collection pipe fixedly mounted on the first suction pipe, and two second dust collection pipes are symmetrically fixedly mounted laterally inside the U-shaped frame. One end of each of the two second dust collection pipes is fixedly connected to one end of the first dust collection pipe, and multiple evenly distributed dust collection holes are opened on the lower side of the pipe wall of the two second dust collection pipes.

[0015] Preferably, the marking mechanism includes a mounting plate fixedly mounted on the second suction pipe, a liquid storage tank fixedly mounted on the upper surface of the mounting plate, a drain pipe fixedly mounted at the bottom of the liquid storage tank, and an electromagnetic switch valve fixedly mounted on the wall of the drain pipe.

[0016] Preferably, the tail of the steel needle is fixedly provided with a mounting plate, and both sides of the mounting plate are provided with bolts that are threadedly connected to the punching roller.

[0017] A method for opening holes in a honeycomb paperboard core layer opening device, the method comprising the following steps:

[0018] S1: Equipment debugging and feeding. The staff checks the status of each component of the punching device and confirms that the steel needles on the punching roller correspond one by one with the needle holes and needle avoidance grooves on the paper guide roller. Then, the honeycomb cardboard core is placed into the gap between the punching roller and the paper guide roller to complete the positioning and feeding of the workpiece to be processed.

[0019] S2: Start the equipment and simultaneously turn on the negative pressure system. The operator operates the PLC controller and sends a start command to drive the motor to run. The motor drives the perforating roller to rotate. The perforating roller and the guide roller rotate synchronously relative to each other through gear meshing. Then, steel needles are used to roll and puncture the honeycomb cardboard core in the conveyor to complete the opening. At the same time, the PLC controller starts the vacuum cleaner to form a stable negative pressure inside the suction channel.

[0020] S3: Real-time detection of hole quality. The negative pressure generated by the vacuum cleaner creates a negative pressure environment in the pinhole area of ​​the paper guide roller. The pressure gauge on the third suction pipe monitors the changes in air pressure in the pipe in real time and transmits the data to the PLC controller. When the honeycomb cardboard core blocks the pinhole, the pressure value decreases. After the hole is punched, the air pressure value increases significantly. If the steel needle is broken and a hole is not punched in a certain area, the increase in pressure value is significantly reduced. After receiving abnormal data, the PLC controller immediately triggers the built-in alarm module of the PLC controller.

[0021] S4: Punch failure location marking. When the PLC controller triggers the alarm, it simultaneously sends a conduction command to the electromagnetic switch valve of the marking mechanism, so that the marking pigment in the storage tank drips through the drain pipe onto the vicinity of the corresponding punch failure area of ​​the honeycomb cardboard core, forming a clear and eye-catching mark, and completing the accurate marking of the problem location.

[0022] S5: Impurities and debris are collected and cleaned simultaneously. Throughout the opening process, the vacuuming mechanism uses the suction holes of the second suction pipes on both sides to perform negative pressure adsorption and cleaning of dust, dander and other impurities on the surface of the honeycomb cardboard core. At the same time, paper scraps, fine fibers and other debris generated by the steel needle opening are sucked in by negative pressure through the needle holes of the paper guide roller and collected into the dust collection chamber of the vacuum cleaner.

[0023] S6: Subsequent rework involves staff quickly locating the failed perforation locations based on the pigment markings on the marking mechanism. Simultaneously, after stopping the machine, damaged or bent steel needles are replaced and repaired. In addition, un-perforated areas of the marked honeycomb cardboard core are reworked and perforated.

[0024] Compared with existing technologies, the advantages of this invention are as follows:

[0025] 1. The hole-opening detection mechanism utilizes the negative pressure generated by the vacuum cleaner to monitor air pressure changes in real time via a pressure gauge. This allows for precise judgment of whether the steel needles are broken or whether there are any unopened areas in the core layer. Once an abnormality is detected, the PLC controller can immediately trigger an alarm, providing timely warning of hole-opening failures and effectively preventing the continuous production of defective products. Simultaneously, paper scraps, fine fibers, and other debris generated during the hole-opening process are collected by the negative pressure adsorption through the needle holes of the paper guide roller and various suction pipes into the vacuum cleaner. This achieves integrated operation of detection and debris collection, improving the accuracy of hole-opening quality control and preventing equipment jamming and a messy production environment caused by debris scattering.

[0026] 2. The dust collection mechanism shares negative pressure with the hole detection mechanism. Dust collection pipes are installed on both sides of the gap between the punching roller and the guide roller. The dust collection holes thoroughly clean the dust, paper scraps, floating debris and other impurities on the cardboard surface, effectively eliminating the interference of impurities on the steel needle piercing. This avoids the bending and breakage of the needle body caused by impurities jamming the steel needle. At the same time, it prevents problems such as irregular hole shape and incomplete punching caused by impurities affecting the piercing accuracy. It keeps the punching area clean, further improves the overall hole quality, and reduces the adverse effects of impurities on the operation of the equipment.

[0027] 3. Through the set marking mechanism, when the PLC controller triggers an alarm for broken steel needles or partial drilling failure, it will simultaneously control the electromagnetic switch valve to conduct, causing the marking pigment in the storage tank to drip along the drain pipe onto the corresponding area of ​​drilling failure. The marking position corresponds closely to the drilling position, forming a clear mark. The location of un-drilled or semi-through holes can be quickly located without the need for staff to check every place. This facilitates timely replacement and repair of faulty steel needles and also makes it easier to rework and fill holes in defective cardboard. It effectively reduces the ineffective workload of manual inspection and ensures the continuous and efficient operation of the production line. Attached Figure Description

[0028] Figure 1 This is a first-view perspective perspective view of a honeycomb cardboard core layer opening device provided by the present invention;

[0029] Figure 2 This is a second-view perspective perspective view of a honeycomb cardboard core layer opening device provided by the present invention;

[0030] Figure 3 This is a perspective view of a honeycomb cardboard core layer opening device provided by the present invention after being cut open;

[0031] Figure 4 This is a perspective view of the connection between a vacuum cleaner, a first suction pipe, a vacuuming mechanism, and a marking mechanism in a honeycomb cardboard sandwich layer opening device provided by the present invention.

[0032] Figure 5 This is a perspective view of the paper guide roller after it has been cut open in a honeycomb cardboard sandwich layer opening device provided by the present invention;

[0033] Figure 6 This is a perspective view of the marking mechanism in a honeycomb cardboard core layer opening device provided by the present invention;

[0034] Figure 7 This is a perspective view of the steel needle in a honeycomb cardboard core layer opening device provided by the present invention.

[0035] In the diagram: 1 U-shaped frame, 2 punching roller, 3 guide roller, 4 steel needle, 5 needle hole, 6 hole detection mechanism, 61 vacuum cleaner, 62 first suction pipe, 63 rotary pipe joint, 64 second suction pipe, 65 third suction pipe, 66 fourth suction pipe, 67 pressure gauge, 7 vacuuming mechanism, 71 first vacuum pipe, 72 second vacuum pipe, 73 vacuum hole, 8 marking mechanism, 81 mounting plate, 82 liquid storage tank, 83 drain pipe, 84 electromagnetic switch valve, 9 PLC controller, 10 motor, 11 gear, 12 needle avoidance groove, 13 mounting plate, 14 bolt. Detailed Implementation

[0036] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments.

[0037] like Figures 1-7 As shown, a perforation device for a honeycomb cardboard sandwich layer includes a U-shaped frame 1 and a perforating roller 2 and a guide roller 3 rotatably disposed inside the U-shaped frame 1. A motor 10 is fixedly mounted on one side of the U-shaped frame 1, and the output end of the motor 10 is fixedly connected to one side of the rotating shaft of the perforating roller 2. Gears 11 are fixedly mounted on the other side of the rotating shafts of the perforating roller 2 and the guide roller 3, and the two gears 11 are meshed. The roller wall of the perforating roller 2 is detachably provided with a plurality of evenly distributed steel needles 4. The tail of the steel needle 4 is fixedly provided with a mounting plate 13, and both sides of the mounting plate 13 are provided with screws that are threadedly connected to the perforating roller 2. Bolt 14: When the steel needle 4 needs to be replaced, the operator can loosen bolt 14 with a wrench to separate the mounting plate 13 from the punching roller 2. The paper guide roller 3 has a hollow structure, and the roller wall of the paper guide roller 3 has multiple evenly distributed pinholes 5. The positions of the multiple steel needles 4 correspond one-to-one with the positions of the multiple pinholes 5. The roller wall of the paper guide roller 3 has needle-avoiding grooves 12 at the positions corresponding to the multiple pinholes 5. When the steel needle 4 is inserted into the pinhole 5 or removed from the inside of the pinhole 5, the needle-avoiding grooves 12 can ensure that the steel needle 4 moves out smoothly and avoids jamming. It also includes:

[0038] An opening detection mechanism 6 is installed on the side wall of the U-shaped frame 1, and the suction end of the opening detection mechanism 6 extends into the interior of the guide roller 3 and is positioned corresponding to the pinhole 5. The opening detection mechanism 6 determines whether the honeycomb cardboard core has been opened based on the suction intensity. The opening detection mechanism 6 includes a vacuum cleaner 61 fixedly installed on the side wall of the U-shaped frame 1. The input end of the vacuum cleaner 61 is fixedly provided with a first suction pipe 62. The rotating shaft of the guide roller 3 has a hollow structure, and a rotating pipe joint 63 is fixedly provided at one end of the rotating shaft of the guide roller 3. One end of the first suction pipe 62 is fixedly connected to the rotating pipe joint 63, which enables a sealed rotating connection between the first suction pipe 62 and the rotating shaft of the guide roller 3. Multiple evenly distributed second suction pipes 64 are fixedly arranged around the rotating shaft of the guide roller 3. One end of each pipe 64 is horizontally fixed with a third suction pipe 65. The walls of the multiple third suction pipes 65 are fixed with multiple evenly distributed fourth suction pipes 66, and the positions of the multiple fourth suction pipes 66 correspond to the positions of the multiple pinholes 5. The distance between the fourth suction pipes 66 and the pinholes 5 is small, which can ensure that the fourth suction pipes 66 can draw air from the inside of the pinholes 5 under negative pressure. The walls of the multiple second suction pipes 64 are fixed with pressure gauges 67. The pressure gauges 67 are XL13AD wireless pressure gauges, which do not need to be connected by wires. The fourth suction pipes 66 corresponding to the pinholes 5 on the paper guide roller 3 that do not contact the honeycomb paperboard core will continuously generate negative pressure. These pinholes 5 are exactly aligned with both sides of the lower surface of the honeycomb paperboard core, which can also perform dust suction on the lower surface of the honeycomb paperboard core.

[0039] A dust collection mechanism 7 is located inside the U-shaped frame 1 and is situated on both sides of the gap between the perforating roller 2 and the guide roller 3. The dust collection mechanism 7 is connected to the perforation detection mechanism 6 and is used to clean the dust generated during the conveying of the honeycomb cardboard core. The dust collection mechanism 7 includes a first dust collection pipe 71 fixedly mounted on the first suction pipe 62. Two second dust collection pipes 72 are symmetrically fixedly mounted laterally inside the U-shaped frame 1. One end of each of the two second dust collection pipes 72 is fixedly connected to one end of the first dust collection pipe 71. Multiple evenly distributed dust collection holes 73 are opened on the lower side of the pipe wall of the two second dust collection pipes 72. The two second dust collection pipes 72 are respectively located on both sides of the gap between the perforating roller 2 and the guide roller 3, and the dust collection holes 73 are aligned with the upper surface of the honeycomb cardboard core.

[0040] The marking mechanism 8 is located on one side of the vacuuming mechanism 7 and is used to mark the unperforated sections of the honeycomb cardboard core. The marking mechanism 8 includes a mounting plate 81 fixedly mounted on the second vacuuming pipe 72. A liquid storage tank 82 is fixedly mounted on the upper surface of the mounting plate 81. The liquid storage tank 82 contains water-based ink. A drain pipe 83 is fixedly mounted on the bottom of the liquid storage tank 82. An electromagnetic switch valve 84 is fixedly mounted on the wall of the drain pipe 83. The water-based ink has good film-forming properties. After dripping onto the surface of the honeycomb cardboard core, it only adheres to the surface layer and does not penetrate into the core layer, thus avoiding damage to the honeycomb core structure of the honeycomb cardboard. It also prevents the marking from smudging or blurring due to penetration, and can accurately delineate the local location where the perforation has failed.

[0041] The PLC controller 9 is fixedly mounted on the side wall of the U-shaped frame 1. The hole detection mechanism 6, the dust collection mechanism 7, the marking mechanism 8, and the motor 10 are all electrically connected to the PLC controller 9.

[0042] The operating principle of this invention is described as follows: The operator places the honeycomb cardboard core between the perforating roller 2 and the guide roller 3. After the loading is completed, the PLC controller 9 issues a start command to drive the motor 10 to run. The power of the motor 10 is transmitted to the rotating shaft of the perforating roller 2. Since the rotating shaft of the perforating roller 2 and the rotating shaft of the guide roller 3 are driven by the meshing of the gear 11, the perforating roller 2 and the guide roller 3 can rotate synchronously relative to each other and maintain a relative rotation state. During the synchronous relative rotation of the two rollers, the honeycomb cardboard core is transported smoothly. At the same time, the steel needles 4 arranged on the outer wall of the perforating roller 2 gradually come into contact with the surface of the honeycomb cardboard core and continue to pierce downward under the action of the roller pressure until the steel needles 4 are precisely inserted into the pre-set needle hole 5 on the roller wall of the guide roller 3. In this way, continuous perforation is completed during the transportation of the honeycomb cardboard core, realizing the synchronous operation of transportation and perforation.

[0043] While the honeycomb cardboard core is being rolled and perforated, the staff simultaneously starts the negative pressure vacuum cleaner 61 via the PLC controller 9. After the vacuum cleaner 61 is turned on, a stable negative pressure airflow is formed in the ventilation channel inside the first suction pipe 62, the second suction pipe 64, the third suction pipe 65, and the fourth suction pipe 66. The suction end of the fourth suction pipe 66 is precisely aligned with the row of pinholes 5 on the paper guide roller 3 and is kept in close proximity. The negative pressure airflow can be conducted to the inside of the pinholes 5 through the fourth suction pipe 66, so that a continuous negative pressure environment is formed in the area of ​​the pinholes 5. During this process, the pressure gauge 67 installed on the second suction pipe 64 will monitor the air pressure changes inside the third suction pipe 65 and the fourth suction pipe 66 in real time and transmit the detected real-time pressure values ​​to the PLC controller 9 for data processing.

[0044] During the conveying process of the honeycomb paperboard core, its surface will block the pinholes 5 on the guide roller 3. At this time, the airflow exchange between the pinholes 5 and the outside is blocked, and the air intake inside the pinholes 5 is greatly reduced, which leads to a significant decrease in the pressure value detected by the pressure gauge 67. When the honeycomb paperboard core is pierced by a row of steel needles 4 of the perforating roller 2 and successfully punches through holes, the row of through holes and the corresponding row of pinholes 5 on the guide roller 3 form an airflow channel that runs vertically through the paperboard. Outside air can quickly enter the pinholes 5 through the through holes of the honeycomb paperboard, so that the air intake in the pinhole 5 area is quickly restored, and the pressure value detected by the pressure gauge 67 rises significantly.

[0045] If a row of steel needles 4 on the perforating roller 2 suffers from localized damage, bending, or other faults, the corresponding position of the honeycomb cardboard core cannot be effectively punctured, resulting in a localized un-perforated situation. At this time, the needle hole 5 at this position cannot effectively connect with the outside, and the airflow channel of the entire row of needle holes 5 is in a state of partial blockage. The recovery of airflow is greatly limited, and the pressure value detected by the pressure gauge 67 will increase less. After receiving the abnormal pressure data, the PLC controller 9 will immediately trigger the internal alarm module and issue an audible and visual alarm signal to promptly remind the staff of the steel needle 4 damage fault and localized perforation failure on site, thereby realizing automated real-time detection and fault warning of perforation quality.

[0046] When the PLC controller 9 triggers the alarm, it simultaneously sends a conduction command to the solenoid valve 84. Upon receiving the command, the solenoid valve 84 opens quickly, making the passage between the liquid storage tank 82 and the drain pipe 83 completely open. Under the action of gravity, the marking pigment in the liquid storage tank 82 flows smoothly down the drain pipe 83 and drips onto the surface of the area near the corresponding area of ​​the honeycomb cardboard core where the perforation failed. This forms a clear and conspicuous mark, eliminating the need for staff to check every place. It can quickly locate the location of problems such as unopened holes and semi-open holes caused by the breakage of the steel needle 4, greatly improving the efficiency of subsequent fault handling and rework, and avoiding ineffective manual inspection work.

[0047] During the entire process of conveying and punching the honeycomb cardboard core, when the negative pressure vacuum cleaner 61 is working, it provides negative pressure power to the first suction pipe 62 and simultaneously forms a stable negative pressure for the first suction pipe 71 and the second suction pipe 72 on both sides. The second suction pipe 72 is located on both sides of the punching roller 2 and the guide roller 3. The suction holes 73 opened on its pipe wall face the surface of the honeycomb cardboard core. Under the action of negative pressure, it can comprehensively and efficiently clean the dust, paper scraps, floating dregs and other impurities on the cardboard surface, remove the interference of impurities on the piercing of the steel needle 4 from the source, avoid impurities from jamming the steel needle 4 or affecting the piercing accuracy, and at the same time keep the punching area clean, reducing problems such as irregular hole shape and incomplete punching caused by impurities.

[0048] During the punching process, the small amount of paper scraps, fine fibers, and other waste generated by the steel needles 4 piercing the honeycomb cardboard core will be quickly sucked into the needle holes 5 under the negative pressure adsorption effect in the area of ​​the guide roller 3 needle hole 5. Then, it will pass through the fourth suction pipe 66, the third suction pipe 65, the second suction pipe 64, the ventilation channel inside the rotating shaft of the guide roller 3, and the first suction pipe 62 in sequence, and finally be collected into the dust collection bin of the vacuum cleaner 61. This waste collection method realizes the simultaneous operation of punching and dust collection. It can not only prevent the scraps from falling on the production line table, the gap between the rollers, or the transmission parts of the equipment, and prevent the punching roller 2 and the guide roller 3 from not rotating smoothly due to the scraps getting stuck, as well as the steel needles 4 from bending and breaking due to the scraps getting stuck, but also effectively reduce the equipment failure rate. It can also prevent the production environment pollution caused by the scattering of scraps and reduce the impact of scraps on subsequent cardboard processing processes.

[0049] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A perforation device for a honeycomb cardboard sandwich layer, comprising a U-shaped frame (1) and a perforating roller (2) and a paper guide roller (3) rotatably disposed inside the U-shaped frame (1), wherein the roller wall of the perforating roller (2) is detachably provided with a plurality of evenly distributed steel needles (4), and the paper guide roller (3) has a hollow structure, and the roller wall of the paper guide roller (3) is provided with a plurality of evenly distributed needle holes (5), characterized in that, Also includes: The hole detection mechanism (6) is set on the side wall of the U-shaped frame (1), and the suction end of the hole detection mechanism (6) extends into the interior of the paper guide roller (3) and is set in accordance with the position of the pinhole (5). The hole detection mechanism (6) determines whether the honeycomb paperboard core layer has been opened according to the suction intensity. The dust collection mechanism (7) is located inside the U-shaped frame (1) and is located on both sides of the gap between the perforating roller (2) and the paper guide roller (3). The dust collection mechanism (7) is connected to the hole detection mechanism (6) and is used to clean the dust generated during the conveying of the honeycomb paperboard core. A marking mechanism (8) is provided on one side of the vacuuming mechanism (7), and the marking mechanism (8) is used to mark the unopened section of the honeycomb cardboard core; The PLC controller (9) is fixedly installed on the side wall of the U-shaped frame (1). The hole detection mechanism (6), the dust collection mechanism (7) and the marking mechanism (8) are all electrically connected to the PLC controller (9).

2. The honeycomb paperboard core layer opening device according to claim 1, characterized in that, A motor (10) is fixedly installed on one side of the U-shaped frame (1), and the output end of the motor (10) is fixedly connected to the rotating shaft on one side of the punching roller (2). Gears (11) are fixedly installed on the rotating shaft on the other side of the punching roller (2) and the paper guide roller (3). The two gears (11) are meshed. The motor (10) is electrically connected to the PLC controller (9).

3. The honeycomb paperboard core layer opening device according to claim 1, characterized in that, The positions of the multiple steel needles (4) are arranged in a one-to-one correspondence with the positions of the multiple needle holes (5), and the roller wall of the paper guide roller (3) is provided with a needle avoidance groove (12) corresponding to the positions of the multiple needle holes (5).

4. The honeycomb paperboard core layer opening device according to claim 2, characterized in that, The hole detection mechanism (6) includes a vacuum cleaner (61) fixedly installed on the side wall of the U-shaped frame (1). The input end of the vacuum cleaner (61) is fixedly provided with a first suction pipe (62). The rotating shaft of the paper guide roller (3) is a hollow structure, and a rotating pipe joint (63) is fixedly provided at one end of the rotating shaft of the paper guide roller (3). One end of the first suction pipe (62) is fixedly connected to the rotating pipe joint (63). A plurality of evenly distributed second suction pipes (64) are fixedly arranged around the rotating shaft of the paper guide roller (3). A third suction pipe (65) is fixedly arranged laterally at one end of each of the plurality of second suction pipes (64). A plurality of evenly distributed fourth suction pipes (66) are fixedly arranged on the pipe walls of the plurality of third suction pipes (65). The positions of the plurality of fourth suction pipes (66) correspond to the positions of the plurality of pinholes (5). A pressure gauge (67) is fixedly arranged on the pipe walls of the plurality of second suction pipes (64).

5. The honeycomb paperboard core layer opening device according to claim 4, characterized in that, The vacuuming mechanism (7) includes a first vacuum pipe (71) fixedly installed on the first suction pipe (62). Two second vacuum pipes (72) are fixedly installed laterally and symmetrically inside the U-shaped frame (1). One end of each of the two second vacuum pipes (72) is fixedly connected to one end of the first vacuum pipe (71). Multiple evenly distributed vacuum holes (73) are opened on the lower side of the pipe wall of the two second vacuum pipes (72).

6. The honeycomb paperboard core layer opening device according to claim 5, characterized in that, The marking mechanism (8) includes a mounting plate (81) fixedly mounted on the second suction pipe (72). A liquid storage tank (82) is fixedly mounted on the upper surface of the mounting plate (81). A drain pipe (83) is fixedly mounted at the bottom of the liquid storage tank (82), and an electromagnetic switch valve (84) is fixedly mounted on the wall of the drain pipe (83).

7. The honeycomb paperboard sandwich layer opening device according to claim 1, characterized in that, The tail of the steel needle (4) is fixedly provided with an installation plate (13), and both sides of the installation plate (13) are provided with bolts (14) that are threadedly connected to the punching roller (2).

8. A method for opening holes in the honeycomb paperboard core layer opening device as described in claim 6, characterized in that, The method includes the following steps: S1: Equipment debugging and feeding. The staff checks the status of each component of the punching device and confirms that the positions of the steel needle (4) on the punching roller (2) correspond one-to-one with the needle hole (5) and needle avoidance groove (12) on the paper guide roller (3). Then, the honeycomb cardboard core is placed into the gap between the punching roller (2) and the paper guide roller (3) to complete the positioning and feeding of the workpiece to be processed. S2: Start the equipment and simultaneously turn on the negative pressure system. The staff operates the PLC controller (9) and sends a start command to drive the motor (10) to run. The motor (10) drives the perforating roller (2) to rotate. The perforating roller (2) and the paper guide roller (3) are meshed by the gear (11) to achieve synchronous relative rotation. Then, the honeycomb cardboard core in the conveying is rolled and pierced by the steel needle (4) to complete the opening. At the same time, the PLC controller (9) starts the vacuum cleaner (61) to form a stable negative pressure inside the suction channel. S3: Real-time detection of hole quality. The negative pressure generated by the vacuum cleaner (61) creates a negative pressure environment in the area of ​​the pinhole (5) of the guide roller (3). The pressure gauge (67) on the third suction pipe (65) monitors the change of air pressure in the pipe in real time and transmits the data to the PLC controller (9). When the honeycomb cardboard core blocks the pinhole (5), the pressure value decreases. After the hole is punched, the air pressure value increases significantly. If the steel needle (4) is broken and causes a local hole not to be opened, the increase in pressure value is significantly reduced. After receiving the abnormal data, the PLC controller (9) immediately triggers the built-in alarm module of the PLC controller (9). S4: Marking the location of the hole-punching failure. When the PLC controller (9) triggers the alarm, it simultaneously sends a conduction command to the electromagnetic switch valve (84) of the marking mechanism (8), so that the marking pigment in the liquid storage tank (82) drips through the drain pipe (83) onto the area near the corresponding hole-punching failure area of ​​the honeycomb cardboard core, forming a clear and conspicuous mark, and completing the accurate marking of the problem location. S5: Impurities and debris are collected and cleaned simultaneously. During the entire opening process, the vacuuming mechanism (7) uses the vacuuming holes (73) of the second vacuuming pipes (72) on both sides to perform negative pressure adsorption and cleaning of dust, dander and other impurities on the surface of the honeycomb cardboard core. At the same time, paper scraps, fine fibers and other debris generated by the opening of the steel needle (4) are sucked in by negative pressure through the needle hole (5) of the guide roller (3) and collected into the dust collection chamber of the vacuum cleaner (61). S6: Subsequent rework: The staff quickly locates the failure position of the punching according to the pigment marking of the marking mechanism (8). At the same time, after the machine is stopped, the broken and bent steel needles (4) are replaced and repaired. In addition, the marked honeycomb cardboard core un-punched areas are reworked and punched.

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