An intelligent dust removal and exhaust system for cigarette label printing

Abstract

The present application discloses an intelligent dust removal and exhaust system for cigarette label printing, comprising: a workshop, which is a closed space; a machine body, which is installed in the workshop, and the machine body is used for cigarette label printing; an internal circulation device, which is arranged in the workshop and connected to the machine body, and the internal circulation device is used to transport dust-free gas to the machine body and exhaust dust in the machine body; and an external circulation device, which is arranged in the workshop, and the external circulation device is used to reduce dust from entering the workshop and remove dust in the workshop. The present application can comprehensively reduce the concentration of dust particles in the printing workshop, ensure the air quality in the machine body during printing, and greatly reduce the dust attached to personnel entering and exiting, thereby greatly improving the printing quality and printing efficiency.

Description

Technical Field

[0001] The present application relates to the technical field of air purification equipment, and in particular to an intelligent dust removal and exhaust system for cigarette label printing. Background Art

[0002] Cigarette label printing refers to the printing of commodity packaging of tobacco products (tobacco shreds, cigarette sticks) that can convey certain specific information of tobacco producers.

[0003] The upstream of cigarette label printing, that is, the main raw materials include paper, ink, laser film, etc. Among the raw materials listed, paper and ink are the basic raw materials, while laser film has a higher technical content. The development of raw materials has a certain impact on the development of the cigarette label printing industry. Its development status directly restricts the cost and innovation ability of the cigarette label industry, and its research and development level also directly restricts the technical level of the cigarette label industry. The downstream of cigarette label printing, that is, the main supply market is the cigarette industry. As the downstream industry of the cigarette label printing industry, the market size of the cigarette industry largely determines the market size of the cigarette industry, and has a significant impact on the development of the cigarette label industry.

[0004] In the process of cigarette label printing, the printing process is the most basic and the first process. Among the printing equipment currently used, whether it is flexographic printing or gravure printing, rotary printing is the main method. However, the roll printing material used in rotary printing is prone to absorb dust and other impurities, which causes printing difficulties, leads to a decline in the quality of printed products, and increases the scrap rate.

[0005] Although the printing workshop in the prior art is a sealed workshop, the entry and exit of personnel will still cause a large amount of dust to be suspended in the workshop, and it is difficult to meet the requirements of a Class 1000 dust-free workshop. Summary of the invention

[0006] In order to overcome the shortcomings of the prior art, the purpose of the present invention is to provide an intelligent dust removal and exhaust system for cigarette label printing, which can comprehensively reduce the dust particle concentration in the printing workshop, ensure the air quality during the printing process inside the machine, and greatly reduce the dust attached to people entering and exiting, thereby greatly improving the printing quality and printing efficiency.

[0007] In order to achieve the above objectives, the present application provides an intelligent dust removal and exhaust system for cigarette label printing, comprising: a workshop, which is a confined space; a machine body, installed in the workshop, and the machine body is used for cigarette label printing; an internal circulation device, arranged in the workshop and connected to the machine body, and the internal circulation device is used to transport dust-free gas to the machine body and discharge dust in the machine body; and an external circulation device, arranged in the workshop, and the external circulation device is used to reduce the dust entering the workshop and remove dust in the workshop.

[0008] Compared with the prior art, the beneficial effects of the present application are: the machine body is installed in a closed workshop, which preliminarily guarantees the amount of dust in the workshop, and is connected to the machine body through an internal circulation device to connect the sealed structure of the machine body, thereby ensuring that dust does not enter the closed structure of the machine body during operation and ensuring the normal operation of the structure, while the exposed part of the machine body is continuously removed from the dust through the external circulation device, and when people enter and leave the workshop, the dust is removed through the external circulation device to improve the dust removal efficiency and quality, thereby greatly improving the printing quality.

[0009] As an improvement, the workshop includes an inlet and outlet; the external circulation device includes an exhaust mechanism and an air suction mechanism, the exhaust mechanism includes an exhaust channel, a first exhaust port and a second exhaust port arranged on the top of the workshop, the first exhaust port faces the machine body, and the second exhaust port faces the inlet and outlet; when the inlet and outlet are closed, the exhaust channel is connected to the first exhaust port, and the second exhaust port is closed, when the inlet and outlet are opened, the exhaust channel is connected to the second exhaust port, and the first exhaust port is closed. Through the above improvement, when the inlet and outlet are closed, the exhaust channel is connected to the first exhaust port, the exhaust channel outputs filtered air, and blows off the dust attached to the machine body and discharges it through the air suction structure, and when the air inlet is open, people enter and exit, the exhaust channel is connected to the second exhaust port, because there is dust attached to the clothes of the people, the gas blown out through the second exhaust port makes the air pressure in the workshop greater than the air pressure outside the workshop, and most of the dust is blown out of the workshop, and the remaining part of the gas is absorbed by the air suction mechanism, thereby solving the problem of dust brought by people entering and exiting.

[0010] As an improvement, the external circulation device also includes a switching mechanism, which includes a control block and a first trigger block, and the first trigger block is located at the second exhaust port; the workshop includes a sliding door, which opens and closes the inlet and outlet by translation, and a sealing block is provided on the upper side of the sliding door, and the control block is fixedly connected to the sealing block. When the inlet and outlet are closed, the sealing block closes the second exhaust port. When the inlet and outlet are fully opened, the control block cooperates with the first trigger block and forces the exhaust channel to switch to communicate with the second exhaust port. Through the above improvement, the sealing block can complete the opening and closing of the second exhaust port, thereby blocking the outlet of the second exhaust port when the sliding door closes the inlet and outlet, and when the sliding door is translated to be fully opened, the exhaust channel is switched to communicate with the second exhaust port through the cooperation of the control block and the first trigger block, and cooperates with the suction structure to make the internal and external air pressures at the air inlet different, so that the air pressure at the workshop door increases, so that dust is not easy to enter the workshop, and the dust attached to the personnel can be blown off by the blowing of the second exhaust port, further improving the efficiency of dust removal.

[0011] As an improvement, the external circulation device also includes a first exhaust pipe and a second exhaust pipe; the exhaust channel is formed in the first exhaust pipe, the second exhaust port is located at the outlet of the first exhaust pipe, a connecting channel is opened at the bottom of the first exhaust pipe, sliding cavities are opened on both sides of the first exhaust pipe, and the first trigger block is movably arranged in the sliding cavity; the second exhaust pipe is movably arranged at the bottom of the first exhaust pipe, the first exhaust port is opened in the second exhaust pipe, the first trigger block is fixedly connected to the upper part of the second exhaust pipe, and the first trigger block cooperates with the control block to force the control block to slide so that the connecting channel is connected or disconnected with the first exhaust port. Through the above improvement, the switching of the exhaust channel and the two exhaust ports requires a complex and precise structure, which is too costly and easy to damage. In this application, the second exhaust pipe is movably arranged at the bottom of the first exhaust pipe, and the connecting channel on the first exhaust pipe is connected or disconnected with the first exhaust port through the cooperation of the first trigger block and the control block, thereby simply and directly completing the switching of the exhaust channel and the two exhaust ports, and can be linked with the sliding door to complete the effect of blowing air through the second exhaust port after the inlet and outlet are opened.

[0012] As an improvement, the switching mechanism also includes a spring, one end of the spring is connected to the inner wall of the sliding cavity, and the other end is connected to the first trigger block; the control block and the first trigger block are located at the same horizontal position, the end of the control block close to the first trigger block is provided with a first inclined surface, and the end of the first trigger block away from the spring is provided with a second inclined surface corresponding to the first inclined surface. When the sliding door moves to fully open the inlet and outlet, the control block moves to the same vertical position as the first trigger block, forcing the first trigger block to compress the spring and drive the second exhaust pipe to move, so that the connecting channel and the first exhaust port are staggered. Through the above improvement, the second exhaust pipe is movably connected to the first exhaust pipe through the first trigger block, and the control block and the first trigger block are staggered, that is, when the sliding door is in a closed state, the spring forces the second exhaust pipe to move to a position where the connecting channel is connected to the first exhaust port, and when the sliding door is in a fully open state, the first inclined surface and the second inclined surface cooperate to make the connecting channel and the first exhaust port staggered, and at the same time, the sealing block is removed to open the second outlet. The structure is simple and stable, and the service life is long.

[0013] As an improvement, the workshop includes a door frame, on which is opened an avoidance channel for the movement of the sliding door. The sliding door, the control block and the first trigger block are each two in number and are symmetrically arranged on both sides of the entrance and exit. Through the above improvement, the arrangement of the two sliding doors greatly increases the space for people to enter and exit, and enables the second air outlet to be targeted at the position where people enter and exit, thereby improving the dust removal effect.

[0014] As an improvement, the suction mechanism includes a first suction square tube and two second suction square tubes. The first suction square tube is located at the bottom of the workshop and at the entrance of the import and export. The two second suction square tubes are symmetrically arranged on the inner side of the door frame. Through the above improvement, the soles of people's shoes are often attached with a large amount of dust. The first suction square tube can thoroughly remove the dust on the soles of people entering and leaving, and the second suction square tube can further remove the dust blown off the people through the second air outlet.

[0015] As an improvement, the first air intake square tube is in a normally open state, a second trigger block is provided on the lower side of the sliding door, and a sensor is provided at the door frame corresponding to the second trigger block. When the sliding door fully opens the inlet and outlet, the second trigger block cooperates with the sensor to connect and drive the second air intake square tube to work. Through the above improvement, the second air square tubes on both sides of the door frame are inefficient in removing dust when the inlet and outlet are closed, so they are closed when the inlet and outlet are closed. When the sliding door is fully opened, it is started through the cooperation of the sensor and the second trigger block on the sliding door, thereby reducing energy consumption and accurately cooperating with the usage scenario to improve the efficiency of dust removal.

[0016] As an improvement, the external circulation device includes a dust removal box, a compressor, a connecting pipe, a fan and an electrically controlled valve. The fan delivers air into the compressor for pressurization. The connecting pipe is used to connect the dust removal box, the compressor, the fan, the first air intake square tube, the second air intake square tube and the electrically controlled valve. The electrically controlled valve is used to control the operation of the second air intake square tube. Through the above improvements, the compressor and the fan can increase the air output of the exhaust mechanism and the air intake mechanism. The dust removal box is equipped with a built-in filter element for efficient dust removal. The electrically controlled valve can accurately control the operation and opening and closing of the second air intake square tube, and is connected and regulated through the connecting pipe.

[0017] As an improvement, the internal circulation device includes an air inlet pipe, an air outlet pipe and a filtering mechanism, the air inlet pipe and the air outlet pipe are respectively connected to the two ends of the body, and the filtering mechanism is arranged at the inlet of the air inlet pipe; it also includes a control console, which is suitable for controlling the operation of the entire system. Through the above improvements, the console can facilitate personnel to perform macro-control and ensure the normal operation of each device. The internal circulation device can ensure that dust does not enter the closed structure of the body, further improving the service life of the body and the printing quality. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 This is a three-dimensional diagram of the overall structure of this application.

[0019] Figure 2 for Figure 1 Schematic diagram of the overall structure after omitting the sliding door.

[0020] Figure 3for Figure 2 Structural diagram from another perspective after omitting part of the workshop wall.

[0021] Figure 4 for Figure 2 Structural diagram from another perspective after omitting part of the workshop wall.

[0022] Figure 5 This is a top view of the overall structure of this application.

[0023] Figure 6 for Figure 5 Schematic diagram of the cross section of AA.

[0024] Figure 7 for Figure 6 A partial enlarged schematic diagram of B in the figure.

[0025] Figure 8 for Figure 7 Schematic diagram of the state when the center sliding door is fully opened.

[0026] Fig. 9 It is a separate structural schematic diagram of part of the external circulation device.

[0027] Fig.10 It is a cross-sectional schematic diagram of the first exhaust pipe, the second exhaust pipe and the sliding door when they cooperate.

[0028] Fig.11 for Fig.10 Schematic diagram of the state when the center sliding door is fully opened.

[0029] Fig.12 This is a schematic diagram of a separate structure when the electric control valve is connected to the connecting pipe and the fan.

[0030] In the figure: 1. workshop; 11. entrance and exit; 12. sliding door; 121. second trigger block; 13. door frame; 131. avoidance channel; 132. sensor; 121. sealing block; 2. machine body; 3. internal circulation device; 31. air inlet pipe; 32. air outlet pipe; 4. external circulation device; 41. exhaust channel; 42. first exhaust port; 43. second exhaust port; 44. first exhaust pipe; 441. sliding cavity; 442. connecting channel; 45. second exhaust pipe; 5. exhaust mechanism; 46. dust removal box; 47. compressor; 481. connecting pipe; 482. fan; 49. electric control valve; 6. suction mechanism; 61. first suction square pipe; 62. second suction square pipe; 7. switching mechanism; 71. control block; 711. first inclined plane; 72. first trigger block; 721. second inclined plane; 73. spring; 8. control console. DETAILED DESCRIPTION

[0031] Below, the present application is further described in conjunction with specific implementation methods. It should be noted that, under the premise of no conflict, the various embodiments or technical features described below can be arbitrarily combined to form new embodiments.

[0032] In the description of the present application, it should be noted that directional words, such as the terms "center", "up", "down", "front", "back", "vertical", "horizontal", "inside", "outside", etc., indicating directions and positional relationships are based on the directions or positional relationships shown in the accompanying drawings. They are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and cannot be understood as limiting the specific scope of protection of the present application.

[0033] It should be noted that the terms "first", "second", etc. in the description and claims of the present application are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence.

[0034] The terms "including" and "having" and any variations thereof in the specification and claims of this application are intended to cover non-exclusive inclusions. For example, a process, method, system, product or apparatus comprising a series of steps or units is not necessarily limited to those steps or units explicitly listed, but may include other steps or units not explicitly listed or inherent to these processes, methods, products or apparatuses.

[0035] The present application provides an intelligent dust removal and exhaust system for cigarette label printing, such as Figure 1-12 As shown, it includes: a workshop 1, which is a closed space; a machine body 2, which is installed in the workshop 1 and is used for cigarette label printing; an internal circulation device 3, which is arranged in the workshop 1 and connected to the machine body 2, and is used for conveying dust-free gas to the machine body 2 and discharging dust in the machine body 2; and an external circulation device 4, which is arranged in the workshop 1 and is used for reducing dust from entering the workshop 1 and removing dust in the workshop 1.

[0036] It should be noted that the wall of the workshop 1 can be made of transparent material or opaque material. The illustration of this application is easy to understand, so part of the wall is omitted to facilitate understanding of the overall layout of the workshop 1 and the technical solution. The electric control opening of the sliding door 12 is also a conventional design, so the sliding door 12 driven by various methods can be applied without interfering with the implementation of this application.

[0037] Specifically, Figure 1-8As shown, the workshop 1 includes an inlet and outlet 11; the external circulation device 4 includes an exhaust mechanism 5 and an air suction mechanism 6, the exhaust mechanism 5 includes an exhaust channel 41, a first exhaust port 42 and a second exhaust port 43 arranged on the top of the workshop 1, the first exhaust port 42 faces the machine body 2, and the second exhaust port 43 faces the inlet and outlet 11; when the inlet and outlet 11 are closed, the exhaust channel 41 is connected with the first exhaust port 42, and the second exhaust port 43 is closed, and when the inlet and outlet 11 are opened, the exhaust channel 41 is connected with the second exhaust port 43, and the first exhaust port 42 is closed.

[0038] Preferably, the second exhaust port 43 is arranged to be inclined toward the inlet and outlet 11 . Since the exhaust mechanism 5 is arranged on the top of the workshop 1 , the second exhaust port 43 is arranged to be inclined downward.

[0039] Specifically, Figure 5-8 As shown, the external circulation device 4 also includes a switching mechanism 7, the switching mechanism 7 includes a control block 71 and a first trigger block 72, the first trigger block 72 is located at the second exhaust port 43; the workshop 1 includes a sliding door 12, the sliding door 12 opens and closes the inlet and outlet 11 by translation, and a sealing block 121 is provided on the upper side of the sliding door 12, the control block 71 is fixedly connected to the sealing block 121, when the inlet and outlet 11 are closed, the sealing block 121 closes the second exhaust port 43, and when the inlet and outlet 11 are fully opened, the control block 71 cooperates with the first trigger block 72 to connect and force the exhaust channel 41 to switch to communicate with the second exhaust port 43.

[0040] Specifically, Figure 9-11 As shown, the external circulation device 4 also includes a first exhaust pipe 44 and a second exhaust pipe 45; the exhaust channel 41 is formed in the first exhaust pipe 44, the second exhaust port 43 is located at the outlet of the first exhaust pipe 44, a connecting channel 442 is opened at the bottom of the first exhaust pipe 44, sliding cavities 441 are opened on both sides of the first exhaust pipe 44, and a first trigger block 72 is movably arranged in the sliding cavity 441; the second exhaust pipe 45 is movably arranged at the bottom of the first exhaust pipe 44, the first exhaust port 42 is opened in the second exhaust pipe 45, the first trigger block 72 is fixedly connected to the upper part of the second exhaust pipe 45, and the first trigger block 72 cooperates with the control block 71 to force the control block 71 to slide so that the connecting channel 442 is connected or disconnected with the first exhaust port 42.

[0041] Preferably, the number of the connecting channels 442 and the number of the first air outlets are both plural and are arranged in sequence along the length direction of the first exhaust pipe 44 , and the number of the connecting channels 442 and the number of the first air outlets are the same.

[0042] Specifically, Figure 10-11As shown, the switching mechanism 7 also includes a spring 73, which provides tension. One end of the spring 73 is connected to the inner wall of the sliding cavity 441, and the other end is connected to the first trigger block 72; the control block 71 and the first trigger block 72 are located at the same horizontal position, and the end of the control block 71 close to the first trigger block 72 is provided with a first inclined surface 711, and the end of the first trigger block 72 away from the spring 73 is provided with a second inclined surface 721 corresponding to the first inclined surface 711. When the sliding door 12 moves to fully open the inlet and outlet 11, the control block 71 moves to the same vertical position as the first trigger block 72, forcing the first trigger block 72 to compress the spring 73 and drive the second exhaust pipe 45 to move, so that the connecting channel 442 is staggered with the first exhaust port 42.

[0043] It should be noted that the present application does not exclude other corresponding card block settings and corresponding application methods, that is, the corresponding application can also be completed through magnetic attraction and electronic control components. Since this is a common technical means used by technicians in this field, it will not be described in detail in this application.

[0044] Specifically, Figure 1-2 As shown, the workshop 1 includes a door frame 13 , on which is opened an avoidance passage 131 for the movement of the sliding door 12 . The number of the sliding door 12 , the control block 71 and the first trigger block 72 are all two and are symmetrically arranged on both sides of the entrance 11 .

[0045] Specifically, Fig. 9 As shown, the suction mechanism 6 includes a first suction square tube 61 and two second suction square tubes 62 . The first suction square tube 61 is located at the bottom of the workshop 1 and at the entrance of the inlet and outlet 11 . The two second suction square tubes 62 are symmetrically arranged on the inner side of the door frame 13 .

[0046] Preferably, a plurality of ventilation holes are provided on the first air suction square tube 61 , and a ventilation groove is provided on the second air suction square tube 62 .

[0047] Specifically, Fig. 9 As shown, the first air intake square tube 61 is in a normally open state, a second trigger block 121 is provided on the lower side of the sliding door 12, and a sensor 132 is provided at the door frame 13 corresponding to the second trigger block 121. When the sliding door 12 fully opens the inlet and outlet 11, the second trigger block 121 cooperates with the sensor 132 to drive the second air intake square tube 62 to work.

[0048] Preferably, the sensor 132 is a pressure sensor.

[0049] Specifically, Fig. 9As shown, the external circulation device 4 includes a dust removal box 46, a compressor 47, a connecting pipe 481, a fan 482 and an electrically controlled valve 49. The fan 482 delivers air into the compressor 47 for pressurization. The connecting pipe 481 is used to connect the dust removal box 46, the compressor 47, the fan 482, the first air intake square tube 61, the second air intake square tube 62 and the electrically controlled valve 49. The electrically controlled valve 49 is used to control the operation of the second air intake square tube 62.

[0050] Specifically, the internal circulation device 3 includes an air inlet pipe 31, an air outlet pipe 32 and a filtering mechanism. The air inlet pipe 31 and the air outlet pipe 32 are respectively connected to the two ends of the body 2, and the filtering mechanism is arranged at the inlet of the air inlet pipe 31; it also includes a control console 8, which is suitable for controlling the operation of the entire system.

[0051] It should be noted that the filtering mechanism is a commonly used technical means for those skilled in the art, and therefore will not be described in detail in this application.

[0052] Preferably, the control console is installed outside the workshop 1 and near the entrance and exit 11 for easy control.

[0053] The working principle of the present application is as follows: the workshop 1 is a closed space, the internal circulation device 3 is connected to the machine body 2, and is respectively connected to the closed structure of the machine body 2 to prevent dust from entering the closed structure of the machine body 2 and ensure the overall printing quality. The external circulation device 4 is used to remove dust in the workshop 1 to reduce dust contamination of the exposed part of the machine body 2.

[0054] When the inlet and outlet 11 is in the closed state, that is, Figure 1 In the state shown, the two sliding doors 12 are completely closed, and the sealing block 121 blocks the second exhaust port 43. At this time, the exhaust channel 41 is connected to the first exhaust port 42. The exhaust channel 41 blows air downward through the first exhaust port 42 to blow off the dust attached to the body 2, and discharges the dust through the suction structure.

[0055] When people need to enter or exit, the sliding door 12 is opened, and the sliding door 12 drives the two sealing blocks 121 to move backwards, thereby opening the second exhaust port 43. When the sliding door 12 is fully opened, Figure 7-8 , Figure 10-11As shown, in this process, the control block 71 moves to the same vertical position as the first trigger block 72, and forces the first trigger block 72 to move along the slide cavity through the cooperation of the first inclined surface 711 and the second inclined surface 721, and drives the second exhaust pipe 45 to move, so that the connecting channel 442 is misaligned with the first exhaust port 42, thereby closing the first exhaust port 42. At this time, the second exhaust port 43 exhausts air and blows obliquely downward toward the inlet and outlet 11 to blow off the dust on the personnel. At the same time, the second trigger block 121 on the sliding door 12 contacts the sensor 132, so that the electric control valve 49 opens the second air suction square tube 62, so that the second air suction square tube 62 on the inner side of the door frame 13 inhales air, so that the air pressure in the workshop is greater than the air pressure outside the workshop, and the dust on the soles of the personnel is absorbed by the first air suction square tube 61, thereby reducing the number of personnel carrying dust into the workshop 1, greatly reducing the amount of dust in the workshop 1, so as to ensure the printing quality of the cigarette label.

[0056] When the sliding door 12 is closed, the sensor 132 loses its induction, the electric control valve 49 stops the operation of the second air intake square pipe 62, and under the action of the spring 73, the second exhaust pipe 45 is reset, the first exhaust port 42 is opened, and the second exhaust port 43 is closed.

[0057] The above describes the basic principles, main features and advantages of the present application. Those skilled in the art should understand that the present application is not limited by the above embodiments. The above embodiments and the specification only describe the principles of the present application. The present application may have various changes and improvements without departing from the spirit and scope of the present application. These changes and improvements fall within the scope of the present application for which protection is sought. The scope of protection claimed by the present application is defined by the attached claims and their equivalents.

Claims

1. An intelligent dust removal and exhaust system for cigarette label printing, characterized in that: include: The workshop is a confined space; A machine body, installed in the workshop, used for cigarette label printing; An internal circulation device, arranged in the workshop and connected to the machine body, the internal circulation device is used to transport dust-free gas to the machine body and discharge dust in the machine body; as well as An external circulation device is arranged in the workshop, and is used to reduce dust from entering the workshop and remove dust in the workshop; The workshop includes an entrance and exit; The external circulation device includes an exhaust mechanism and an air intake mechanism, wherein the exhaust mechanism includes an exhaust passage arranged on the top of the workshop, a first exhaust port and a second exhaust port, wherein the first exhaust port faces the machine body, and the second exhaust port faces the inlet and outlet; When the inlet and outlet are closed, the exhaust passage is connected to the first exhaust port, and the second exhaust port is closed; when the inlet and outlet are opened, the exhaust passage is connected to the second exhaust port, and the first exhaust port is closed; The external circulation device further includes a switching mechanism, the switching mechanism includes a control block and a first trigger block, and the first trigger block is located at the second exhaust port; The workshop includes a sliding door, which opens and closes the inlet and outlet by sliding horizontally. A sealing block is provided on the upper side of the sliding door, and the control block is fixedly connected to the sealing block. When the inlet and outlet are closed, the sealing block closes the second exhaust port. When the inlet and outlet are fully opened, the control block cooperates with the first trigger block and forces the exhaust channel to switch to communicate with the second exhaust port.

2. The intelligent dust removal and exhaust system for cigarette label printing as claimed in claim 1, characterized in that: The external circulation device also includes a first exhaust pipe and a second exhaust pipe; The exhaust channel is formed in the first exhaust pipe, the second exhaust port is located at the outlet of the first exhaust pipe, a connecting channel is opened at the bottom of the first exhaust pipe, sliding cavities are opened on both sides of the first exhaust pipe, and the first trigger block is movably arranged in the sliding cavity; The second exhaust pipe is movably arranged at the bottom of the first exhaust pipe, the first exhaust port is opened in the second exhaust pipe, the first trigger block is fixedly connected to the upper part of the second exhaust pipe, and the first trigger block cooperates with the control block to force the control block to slide so that the connecting channel is connected or disconnected with the first exhaust port.

3. The intelligent dust removal and exhaust system for cigarette label printing as claimed in claim 2, characterized in that: The switching mechanism further includes a spring, one end of which is connected to the inner wall of the sliding cavity, and the other end of which is connected to the first trigger block; The control block and the first trigger block are located at the same horizontal position, and a first inclined surface is provided at one end of the control block close to the first trigger block, and a second inclined surface corresponding to the first inclined surface is provided at one end of the first trigger block away from the spring. When the sliding door moves to fully open the inlet and outlet, the control block moves to the same vertical position as the first trigger block, forcing the first trigger block to compress the spring and drive the second exhaust pipe to move, so that the connecting channel is staggered with the first exhaust port.

4. The intelligent dust removal and exhaust system for cigarette label printing as claimed in claim 1, characterized in that: The workshop comprises a door frame, on which an avoidance passage for the movement of the sliding door is opened, and the sliding door, the control block and the first trigger block are all in two numbers and are symmetrically arranged on both sides of the entrance and exit.

5. The intelligent dust removal and exhaust system for cigarette label printing as claimed in claim 4, characterized in that: The air suction mechanism includes a first air suction square tube and two second air suction square tubes, the first air suction square tube is located at the bottom of the workshop and at the entrance of the inlet and outlet, and the two second air suction square tubes are symmetrically arranged on the inner side of the door frame.

6. The intelligent dust removal and exhaust system for cigarette label printing as claimed in claim 5, characterized in that: The first air intake square tube is in a normally open state, a second trigger block is provided on the lower side of the sliding door, and a sensor is provided on the door frame corresponding to the second trigger block. When the sliding door fully opens the inlet and outlet, the second trigger block cooperates with the sensor and drives the second air intake square tube to work.

7. The intelligent dust removal and exhaust system for cigarette label printing as claimed in claim 6, characterized in that: The external circulation device includes a dust removal box, a compressor, a connecting pipe, a fan and an electrically controlled valve. The fan delivers air into the compressor for pressurization. The connecting pipe is used to connect the dust removal box, the compressor, the fan, the first air intake square pipe, the second air intake square pipe and the electrically controlled valve. The electrically controlled valve is used to control the operation of the second air intake square pipe.

8. The intelligent dust removal and exhaust system for cigarette label printing according to any one of claims 1 to 7, characterized in that: The internal circulation device includes an air inlet pipe, an air outlet pipe and a filtering mechanism, wherein the air inlet pipe and the air outlet pipe are respectively connected to the two ends of the machine body, and the filtering mechanism is arranged at the inlet of the air inlet pipe; and also includes a control console, which is suitable for controlling the operation of the entire system.

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