A punching drum and punching device for improving the stability of ventilation during online cigarette punching.

Abstract

This invention discloses a perforating drum for improving the stability of ventilation during online cigarette punching. The surface of the perforating drum is provided with isolation stems for transporting and adsorbing thin rods. An anti-clogging structure is provided on the surface of the drum between adjacent isolation stems. The distribution of the anti-clogging structure is basically consistent with the rotation path of the thin rod during punching. The anti-clogging structure consists of a widened anti-scalding groove pre-set on the surface of the drum or at least a row of positive pressure purging holes pre-set on the surface of the drum. Of course, a combination of the two is better. Experimental data shows that the combination of the two can maintain stable production operation for a long time.

Description

Technical Field

[0001] This invention belongs to the field of laser drilling technology, and specifically relates to a drilling drum wheel that improves the ventilation stability of online cigarette drilling. Background Technology

[0002] Online laser perforation of thin cigarette sticks is being used more and more. However, customers have increasingly higher requirements for the stability of perforation ventilation. Not only should the deviation of the average ventilation value not exceed a certain value, but statistical standard deviation and coefficient of variation should also be assessed and accepted. After in-depth research and observation, based on the implementation of other stability technical solutions of our company, we have further improved the perforation drum. Practice has proven that it can indeed improve the stability of online cigarette perforation ventilation.

[0003] When the punching device is used, the laser beam irradiates the surface of the cigarette, causing the tipping paper or cigarette paper to vaporize and form a flow of glue residue that explodes outward at high speed with the center of the hole as the origin. As the cigarette rotates under the action of the roller and the drum, the flow of glue residue will be sprayed and stick to the surface of the drum, thus making the punching data unstable.

[0004] The information disclosed in this background section is intended only to enhance the understanding of the overall background of the invention and should not be construed as an admission or in any way implying that the information constitutes prior art known to those skilled in the art. Summary of the Invention

[0005] The purpose of this invention is to provide a punching drum that improves the ventilation stability of online cigarette punching by preventing the accumulation of punching dust, thereby overcoming the defects in the prior art.

[0006] To achieve the above objectives, this invention provides a perforating drum for improving the ventilation stability of online cigarette perforation. The perforating drum surface is provided with isolation stems for transporting and adsorbing thin rods. An anti-clogging structure is provided on the drum surface between adjacent isolation stems. The distribution of the anti-clogging structure is basically consistent with the rotation path of the thin rod during perforation. The anti-clogging structure consists of a pre-set widened adhesive-avoiding groove on the drum surface or at least one row of pre-set positive pressure purging holes on the drum surface. Alternatively, the anti-clogging structure consists of a pre-set widened adhesive-avoiding groove on the drum surface and at least one row of positive pressure purging holes placed within the widened adhesive-avoiding groove.

[0007] Through on-site observation, we found that the gel-like substance accumulated on the drum was mainly formed by a mixture of dust generated during laser drilling. Therefore, our improvement strategy was to minimize the accumulation of this dust in the drilling area of ​​the drum. We adopted two solutions: one was to design a variable diameter groove, where the airflow was compressed to create high pressure, thus preventing the gel-like substance from entering. The other was direct backflushing.

[0008] Preferably, in the above technical solution, the anti-clogging structure is a pre-set widened glue-avoiding groove on the surface of the drum. Specifically, the widened glue-avoiding groove is such that the groove opening D and the groove bottom d of the same cross section are related as D=d, and the groove width d1 at the starting end of the drilling and the groove width d2 at the ending end of the drilling are related as d1>d2.

[0009] Preferably, in the above technical solution, the anti-clogging structure is a pre-set widened glue-avoiding groove on the surface of the drum. Specifically, the widened glue-avoiding groove is such that the groove opening D and the groove bottom d of the same cross section are related as D > d, and the groove width d1 at the starting end of the drilling and the groove width d2 at the ending end of the drilling are related as d1 = d2.

[0010] Preferably, in the above technical solution, the anti-clogging structure is a pre-set widened glue-avoiding groove on the surface of the drum. Specifically, the widened glue-avoiding groove is such that the groove opening D and the groove bottom d of the same cross section are related as D > d, and the groove width d1 at the starting end of the drilling and the groove width d2 at the ending end of the drilling are related as d1 > d2.

[0011] Preferably, in the above technical solution, the anti-clogging structure is at least one row of positive pressure blowing holes pre-set on the surface of the drum. The positive pressure blowing holes are air holes distributed on each cigarette rolling surface, corresponding to the focal point position of the focusing device on the cigarette surface, and extending along the circumference of the perforated drum rolling surface.

[0012] Preferably, in the above technical solution, the aperture is 1.0-3.0 mm and the aperture distribution density is 2-4 per 6 mm arc length, so that the compressed air flow forms a continuous airflow curtain, preventing the sludge jet from contacting the drum.

[0013] Preferably, in the above technical solution, the hole is a variable diameter hole, comprising a sequentially connected section with a reduced diameter, a constant diameter, and an expanded diameter, wherein the length of the reduced diameter section is greater than the length of the expanded diameter section. This design increases the velocity of the outlet airflow, counteracting the impact of the jetting debris airflow generated by the laser.

[0014] Preferably, in the above technical solution, the positive pressure blowing hole can also be replaced by an external negative pressure adsorption device. The external negative pressure adsorption device can be understood as the principle of a vacuum cleaner, which sucks away the floating dust.

[0015] A perforating drum for improving the stability of ventilation during online cigarette punching is disclosed. The drum surface is provided with isolation stems for transporting and adsorbing thin rods. An anti-clogging structure is provided on the drum surface between adjacent isolation stems. The distribution of the anti-clogging structure is basically consistent with the rotation path of the thin rod during punching. The anti-clogging structure consists of equal-width anti-dust grooves pre-set on the drum surface and at least one row of positive pressure purging holes distributed within the anti-dust grooves. This solution adds a purging function to a conventional straight groove, primarily aiming to better utilize existing equipment components to improve production quality. While this solution's protection scope includes negative pressure adsorption, it is generally not recommended to replace positive pressure purging with negative pressure adsorption, as adsorption may exacerbate localized dust adsorption. However, negative pressure can increase the cleanliness of the punched area, improving overall cleanliness. Customers can easily switch between positive and negative pressure air sources as needed, which is readily achievable.

[0016] A perforating drum for improving the ventilation stability of online cigarette punching, wherein the surface of the perforating drum is provided with an isolation stem for transporting and adsorbing thin rods, and a roller and a focusing perforating device are provided on one side of the perforating drum, characterized in that: an airflow purging device is provided on one side of the roller or the focusing perforating device, and the airflow blown by the airflow purging device is aimed at the axial outer side of the area where the focusing perforating device burns the thin rod and the area covered by the glue spray flow.

[0017] Preferably, in the above technical solution, the airflow purging device can also be replaced by a negative pressure adsorption device.

[0018] A perforating drum for improving the ventilation stability of online cigarette punching, wherein the surface of the perforating drum is provided with an isolation stem for transporting and adsorbing thin rods, characterized in that: an anti-clogging structure is provided on the surface of the drum, the isolation stem is broken at the anti-clogging structure, the setting position of the anti-clogging structure is basically consistent with the rotation and punching path of the thin rod, and the anti-clogging structure consists of a pre-set widened anti-scalding groove on the surface of the drum or at least a pre-set positive pressure blowing hole on the surface of the drum.

[0019] Preferably, in the above technical solution, the negative pressure adsorption device consists of a dust suction port, a negative pressure pipe, and a negative pressure airflow connected to the negative pressure pipe. The dust suction port is located on the axial outer side of the burning rod of the focusing and drilling device, in the area covered by the glue spray flow. The dust suction port has a shape that gradually contracts with the direction of the dust inlet flow.

[0020] Preferably, in the above technical solution, the pressure of the negative pressure suction is 50-120 kPa, and the diameter of the negative pressure pipe is ≥25 mm.

[0021] Compared with the prior art, the present invention has the following beneficial effects:

[0022] After adopting the widened glue-avoiding tank of this solution, the stable operation time of the drilling drum is significantly extended, and the intensity and time of equipment cleaning and maintenance are reduced. However, for perforation with high ventilation, the required laser energy and jet air pressure are also high, so it will still cause the drum to stick to dust, thus affecting the stability of the drilling data.

[0023] The active anti-sticking and cleaning structure on the drum surface of this solution, namely the combination of the glue-avoiding groove with the positive pressure blowing hole and the dust collection device, significantly extends the stable operation time of the perforating drum and reduces the intensity and time of equipment cleaning and maintenance. Especially for cigarette perforation applications with high ventilation, even with the large laser energy required, the increased pressure of the paper gasification jet airflow, and the significant increase in glue residue, it can still maintain stable operation for a long time without affecting the stability of the perforation data due to dust sticking to the drum. Attached Figure Description

[0024] Figure 1a and Figure 1b A physical image showing a problem with existing technology;

[0025] Figure 2 Schematic diagram of the glue scale tank;

[0026] Figure 3 A schematic diagram of the glue jet stream generated by laser drilling;

[0027] Figure 4 This is a schematic diagram of a reverse airflow hole;

[0028] Figure 5 This is a schematic diagram of a side-blowing device;

[0029] Figure 6 Schematic diagram of a rectangular glue-avoiding tank;

[0030] Figure 7 Schematic diagram of a trapezoidal glue-avoiding tank;

[0031] Figure 8 A schematic diagram showing the distribution of positive pressure purging holes on the perforated drum.

[0032] Figure 9 Schematic diagram of the airflow channel for blowing air through the small orifice;

[0033] Figure 10 A schematic diagram of the glue scale tank and the reverse airflow hole;

[0034] Figure 11 A schematic diagram showing the combination of a dust collection device and a glue residue tank;

[0035] Figure 12 A schematic diagram of a reverse airflow hole combined with a dust collection device;

[0036] Figure 13 This is a schematic diagram of a through-slot;

[0037] Figure 14 This is a schematic diagram of the external vacuum cleaner in operation.

[0038] Figure 15 This is a schematic diagram of the positive pressure purging hole. Detailed Implementation

[0039] The specific embodiments of the present invention will be described in detail below, but it should be understood that the scope of protection of the present invention is not limited to the specific embodiments.

[0040] Unless otherwise expressly stated, throughout the specification and claims, the term "comprising" or its variations such as "including" or "comprises" shall be understood to include the stated elements or components without excluding other elements or other components.

[0041] Example 1

[0042] Composition: The device consists of a cigarette rotating roller, a perforated drum, and a perforated drum surface that is either equipped with a glue-avoiding groove (Scheme 1), a positive pressure blowing hole (Scheme 2), or an external blowing device (Scheme 3) and a laser focusing device. The cigarette rotating roller is either an integral long shaft type or a separate type. The perforated drum has an isolation stem and cigarette inlet and outlet grooves distributed on both sides of the isolation stem. The area between two adjacent cigarette inlet and outlet grooves is the cigarette rolling surface. The glue-avoiding groove is a groove distributed on each cigarette rolling surface, corresponding to the focusing point of the focusing device on the cigarette surface, and extending circumferentially along the rolling surface of the perforated drum to prevent glue from sticking to the drum surface.

[0043] The thin rod or cigarette mentioned in this article specifically refers to a double-length filter cigarette. The anti-glue groove is located on both sides of the cigarette section or the double-length filter section, corresponding to the convergence point of the laser focusing device on the cigarette. The cross-section of the groove is rectangular or trapezoidal, preferably trapezoidal.

[0044] The rectangular scale-avoiding groove has a groove width d1 of at least 6mm and a depth H of at least 2mm at the starting end of the perforation (near the smoke inlet groove), preferably d1=5mm and H=2mm. The groove width gradually expands along the circumference to form a groove width d2=4mm at the ending end of the perforation (near the smoke outlet groove), forming a widened scale-avoiding groove. During this process, when the drum rotates, the airflow in the groove is compressed, forming high pressure, which prevents scale from entering.

[0045] The trapezoidal anti-fouling groove has an upper opening width D of at least 3mm, a lower base width d of at least 2mm, a trapezoidal angle of 3-30°, and a depth H of at least 2mm.

[0046] Example 2

[0047] The positive pressure purging holes are air holes distributed on each cigarette rolling surface, corresponding to the focal point of the focusing device on the cigarette surface, and extending circumferentially along the rolling surface of the perforated drum. Compressed air flows out through the positive pressure purging holes, preventing the jet airflow from contacting the drum surface. The positive pressure purging holes are air holes distributed on each cigarette rolling surface, corresponding to the focal point of the focusing device on the cigarette surface, and extending circumferentially along the rolling surface of the perforated drum. The hole diameter is 1.0-3.0 mm, and the hole distribution density is 2-4 holes / 6 mm arc length, which makes the compressed air flow form a continuous airflow curtain, preventing the glue residue jet from contacting the drum.

[0048] The positive pressure purging holes at the bottom of the glue scale groove distributed on the surface of the perforated drum are connected to the inner wall holes of the drum through the airflow channel. The airflow distribution drum is coaxially arranged on the inner side of the perforated drum. The surface of the airflow distribution drum is provided with air grooves with a length of at least the pitch between two drum isolation stems, and corresponding to the counterflow airflow holes at the bottom of the glue scale groove of the drum.

[0049] The air grooves on the surface of the air distribution drum are connected to the compressed air inlet through axial air passages. This design ensures that only the counter-current air holes on the drum roller rotating surface that enters the drilling working position are supplied with compressed air, while other counter-current air holes that do not reach the drilling working position are not supplied with compressed air, thus saving energy.

[0050] Example 3

[0051] The outer blowing device is a blowing device located outside the focusing device, which uses the airflow to prevent the sprayed glue residue from contacting the drum surface.

[0052] The external blowing device uses compressed air to isolate the glue residue jet from the drum, preventing the drum surface from being stuck with glue residue.

[0053] Example 4

[0054] A scheme combining a glue-avoiding groove and a positive pressure purging hole is disclosed, comprising: a cigarette rotating roller, a perforated drum, a glue-avoiding groove on the surface of the perforated drum, a positive pressure purging hole located at the bottom of the glue-avoiding groove, and a laser focusing device. The characteristic is that the cigarette rotating roller is either an integral long shaft or a separate type; the perforated drum has an isolation stem and cigarette inlet and outlet grooves distributed on both sides of the isolation stem; the area between two adjacent cigarette inlet and outlet grooves forms a cigarette rolling surface; and the glue-avoiding groove is a groove distributed on each cigarette rolling surface, corresponding to the focal point of the focusing device on the cigarette surface, extending circumferentially along the rolling surface of the perforated drum.

[0055] Positive pressure purging holes are distributed in each anti-fouling groove. Compressed air flows out through the positive pressure purging holes to prevent the jet airflow from contacting the drum surface.

[0056] The glue-avoidance groove is a straight groove with d1=d2, which facilitates processing and reduces costs.

[0057] Example 5

[0058] A combination of a glue-avoiding groove and a vacuuming device comprises: a cigarette rotating and rolling mechanism, a perforating drum, a glue-avoiding groove on the surface of the perforating drum, a vacuuming device and a laser focusing device disposed on one side of the perforating device and the drum, characterized in that: the glue-avoiding groove is a groove distributed on each rotating surface of the cigarette, corresponding to the focal point of the focusing device on the cigarette surface, and extending circumferentially along the rotating surface of the perforating drum; the vacuuming device is disposed on one side of the perforating device and the drum, and uses airflow formed by negative pressure to guide the jet airflow of glue into the vacuuming device, which is connected to an external negative pressure suction source.

[0059] The negative pressure adsorption device consists of a dust suction port, a negative pressure pipe, and a negative pressure airflow connected to the negative pressure pipe. The dust suction port is located on the axial outer side of the burning rod of the focusing and drilling device, in the area covered by the glue spray flow. The dust suction port has a shape that gradually narrows with the direction of the dust inlet flow.

[0060] Preferably, in the above technical solution, the pressure of the negative pressure suction is 50-120 kPa, and the diameter of the negative pressure pipe is ≥25 mm.

[0061] Example 6

[0062] A combination of a glue-avoiding groove and a dust collection device comprises: a cigarette rotating and rolling mechanism, a perforating drum, a widened glue-avoiding groove on the surface of the perforating drum, a dust collection device and a laser focusing device disposed on one side of the perforating mechanism and the drum, characterized in that: the glue-avoiding groove is a widened groove distributed on each rotating surface of the cigarette, corresponding to the focal point of the focusing device on the cigarette surface, extending circumferentially along the rotating surface of the perforating drum; the dust collection device is disposed on one side of the perforating mechanism and the drum, utilizing airflow generated by negative pressure to guide the glue-avoiding jet into the dust collection device. The negative pressure adsorption device consists of a dust suction port, a negative pressure pipe, and negative pressure airflow connected to the negative pressure pipe; the dust suction port is located axially outside the burning rod of the focusing and perforating device, in the area covered by the glue-avoiding jet, and the dust suction port has a shape that gradually narrows with the direction of the dust inlet flow. The negative pressure suction pressure is 50-120 kPa, and the diameter of the negative pressure pipe is ≥25 mm.

[0063] Example 7

[0064] A combination of a glue-avoiding groove and a dust collection device comprises: a cigarette rotating roller, a perforating drum, a glue-avoiding groove on the surface of the perforating drum, a positive pressure blowing hole at the bottom of the glue-avoiding groove, a dust collection device located on one side of the perforating device and the drum, and a laser focusing device. The key feature is that the bottom of the glue-avoiding groove has a positive pressure blowing hole, through which pressurized airflow is blown out via a reverse airflow hole. The dust collection device is located on one side of the perforating device and the drum, utilizing the airflow formed by negative pressure to guide the jet of glue-avoiding material into the dust collection device.

[0065] The negative pressure adsorption device consists of a dust suction port, a negative pressure pipe, and a negative pressure airflow connected to the negative pressure pipe. The dust suction port is located on the axial outer side of the burning rod of the focusing and drilling device, in the area covered by the sludge jet. The dust suction port has a shape that gradually narrows along the direction of the dust inlet flow. The negative pressure suction pressure is 50-120 kPa, and the diameter of the negative pressure pipe is ≥25 mm.

[0066] Example 8

[0067] A technical solution for a perforated drum wheel surface with a through groove for preventing glue buildup is provided, comprising: a rotating cigarette roll, a perforated drum wheel, a glue-avoiding groove provided on the circumferential surface of the perforated drum wheel, and a laser focusing device. The feature is that the glue-avoiding groove is a through groove distributed on the circumferential surface of the perforated drum wheel, corresponding to the focal point of the focusing device on the cigarette surface, and extending uninterruptedly along the circumference of the rolling surface of the perforated drum wheel.

[0068] Experimental data:

[0069] Test conditions: The online cigarette punching device was installed on the same cigarette rolling machine to produce cigarettes of the same brand.

[0070] Testing equipment: The cigarette filter rod tester manufactured by Chengdu Ruituo was selected and equipped on the machine in the cigarette making and packaging workshop where the equipment is located.

[0071] Sample 1: Data from a rectangular straight glue scale tank (d=4mm, H=2mm) with a perforated drum running for less than 3 hours (the drum already had glue scale, but it did not affect operation), sd was 1.67, while the process standard sd≦2.0;

[0072] Sample 2: Data after 4 hours of operation of a rectangular straight glue scale tank (d=4mm, H=2mm) with a perforated drum (the tank was clogged with glue scale). The standard deviation was significantly larger, with sd=2.09, exceeding the process requirement standard.

[0073] Sample 3: Data after 8 hours of operation of a rectangular variable-width glue-avoidance tank (d1=6, d2=4mm, H=2mm) with a perforated drum (the tank was clogged with glue scale). Although the standard deviation was large (sd=2.42), exceeding the process requirement standard, the length of the rectangular straight glue-avoidance tank during stable operation was doubled.

[0074] Sample 4: Data after 12 hours of operation of a rectangular straight glue scale tank (d=4mm, H=2mm) + a perforated drum with counterflow vents inside the tank (the drum had almost no glue scale). The standard deviation remained within the normal range of sd=1.58 and did not exceed the process requirements.

[0075] Sample 5: Data on the operation of the drum wheel of the rectangular glue-free groove (d=4mm, H=2mm) with perforation for less than 8 hours (the drum wheel was covered with glue, but it did not affect the operation). Although the standard deviation was large (sd) of 2.22, which exceeded the process requirement standard, the stable working time was twice as long as that of the rectangular straight glue-free groove.

[0076]

[0077] Technical effects:

[0078] Using a conventional straight glue tank, although the equipment can operate, it can only maintain stable operation for a very short time for perforation applications with high ventilation.

[0079] After adopting the widened glue-avoiding tank of this solution, the stable operation time of the drilling drum is significantly extended, and the intensity and time of equipment cleaning and maintenance are reduced. However, for perforation with high ventilation, the required laser energy and jet air pressure are also high, so it will still cause the drum to stick to dust, thus affecting the stability of the drilling data.

[0080] The combination of the anti-fouling tank and the positive pressure blowing hole and dust collection device in this solution significantly extends the stable operation time of the drilling drum and reduces the intensity and time of equipment cleaning and maintenance. However, for applications with high ventilation, high laser energy, and high jet air pressure, it can still maintain stable operation for a long time and will not affect the stability of drilling data due to dust sticking to the drum.

[0081] The effect of a single measure is limited; the optimal solution is to adopt a combination of measures, which can achieve significant results.

[0082] The foregoing description of specific exemplary embodiments of the invention is for illustrative and explanatory purposes. These descriptions are not intended to limit the invention to the precise forms disclosed, and it will be apparent that many changes and variations can be made in accordance with the foregoing teachings. The exemplary embodiments were chosen and described in order to explain the specific principles of the invention and its practical application, thereby enabling those skilled in the art to implement and utilize various different exemplary embodiments of the invention, as well as various different choices and variations. The scope of the invention is intended to be defined by the claims and their equivalents.

Claims

1. A perforation drum for improving the stability of online cigarette perforation ventilation, the surface of the perforation drum is provided with isolation stems for transporting and adsorbing fine rods, characterized in that: The drum surface between adjacent isolated stems is provided with an anti-blocking structure, the distribution of the anti-blocking structure is basically consistent with the rotating punching path of the stick, the anti-blocking structure is a pre-set variable-width glue dirt avoiding groove on the drum surface, or the anti-blocking structure is composed of the pre-set variable-width glue dirt avoiding groove on the drum surface and at least one row of positive pressure blowing holes arranged in the variable-width glue dirt avoiding groove; The variable-width glue dirt avoiding groove is specifically: the relationship between the slot opening D and the slot bottom d of the same section is D=d, the relationship between the slot width d1 of the starting end of punching and the slot width d2 of the ending end of punching is d1>d2, and the slot width of the variable-width glue dirt avoiding groove gradually expands along the circumferential direction. Or the variable-width glue dirt avoiding groove is specifically: the relationship between the slot opening D and the slot bottom d of the same section is D>d, the relationship between the slot width d1 of the starting end of punching and the slot width d2 of the ending end of punching is d1=d2, and the slot profile of the variable-width glue dirt avoiding groove is trapezoidal. Or the variable-width glue dirt avoiding groove is specifically: the relationship between the slot opening D and the slot bottom d of the same section is D>d, the relationship between the slot width d1 of the starting end of punching and the slot width d2 of the ending end of punching is d1>d2, the slot width of the variable-width glue dirt avoiding groove gradually expands along the circumferential direction, and the slot profile is trapezoidal.

2. The perforating drum of claim 1, wherein: The positive pressure blowing hole is a gas hole distributed on each cigarette rolling surface, corresponding to the focusing point position on the cigarette surface of the focusing device, and extending along the circumferential direction of the punching drum rolling surface. The positive pressure blowing hole corresponds to the gas groove of the corresponding air flow distribution drum through the drum air channel, and the gas groove on the surface of the air flow distribution drum is connected to the compressed air inlet through the axial air channel.

3. The perforating drum of claim 2, wherein: The hole diameter of the positive pressure blowing hole is 1.0-3.0mm, and the hole distribution density is 2-4 / 6mm arc length, so that the air pressure gas flow forms a continuous gas flow curtain, preventing the glue dirt jet flow from contacting the drum.

4. The perforating drum of claim 2 or 3, wherein: The hole of the positive pressure blowing hole is a variable-diameter hole, including a sequentially connected reduced-diameter section, a constant-diameter section and an expanded-diameter section, and the length of the reduced-diameter section is greater than the length of the expanded-diameter section.

5. The perforating drum wheel for improving the stability of online cigarette perforation and ventilation according to any one of claims 1-4, characterized in that: The positive pressure blowing hole is replaced by an external negative pressure suction device.

6. The perforating drum of claim 5, wherein: The negative pressure suction device is composed of a dust suction port, a negative pressure pipeline and a negative pressure gas flow connected to the negative pressure pipeline, the dust suction port is arranged on the axial outer side of the focusing and punching device burning the stick and the area covered by the glue dirt jet flow, and the dust suction port has a shape gradually narrowing along the dust inlet flow direction.

7. The perforating drum of claim 6, wherein: The pressure of the negative pressure suction is 50-120kPa, and the pipe diameter of the negative pressure pipeline is greater than or equal to 25mm.

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