Leaf re-drying machine and filter screen cleaning system and cleaning method thereof

Abstract

The invention provides a leaf re-drying machine and a filter screen cleaning system and method thereof. The filter screen cleaning system comprises a filter screen which is configured as an air return channel for preventing tobacco leaves from passing through a moisture regaining area of the leaf redrying machine; the detector is configured to detect the pressure difference delta P between the air inlet side and the air outlet side of the filter screen; the cleaning device comprises a compressed air injection mechanism and / or a steam injection mechanism, the compressed air injection mechanism is configured to inject compressed air to the air inlet side of the filtering separation net, and the steam injection mechanism is configured to inject steam to the air inlet side of the filtering separation net so that the tobacco leaves attached to the filtering separation net can fall off; and the controller is operably connected to the detector and the cleaning device, and is configured to determine whether compressed air and / or steam are / is blown to the air inlet side of the filter screen through the cleaning device according to the pressure difference delta P. The leaf redrying machine comprises the filter screen cleaning system. According to the technical scheme, the cleaning efficiency of the filter screen in the leaf re-drying machine can be improved.

Description

Technical Field

[0001] The present disclosure relates to the field of tobacco processing equipment, and in particular to a blade redrying machine and a filter screen cleaning system and a cleaning method thereof. Background Art

[0002] The leaf redrying machine is the main equipment in the leaf threshing and redrying production line. Its purpose is to adjust the moisture in the tobacco leaves, remove impurities in the tobacco leaves, kill pests and pathogens in the tobacco leaves, make the tobacco leaves more suitable for storage, aging and artificial fermentation, and improve the consistency of tobacco leaf quality.

[0003] After a leaf re-drying machine has been running for a while, the circulating air in the rehumidification zone gradually causes a large amount of tobacco leaves to adhere to and accumulate on the filter screens in the return air duct. This causes the filter screen mesh to gradually become blocked, increasing the circulating air resistance and reducing the air volume, which affects the rehumidification effect of the tobacco leaves. At the same time, the tobacco leaves accumulated on the filter screens will have a significant increase in moisture content due to the humid environment. The continuously accumulated tobacco leaves and the increasing moisture content will occasionally clump into the main line tobacco leaves, causing significant quality risks such as water-stained tobacco leaves. However, the current cleaning methods for the filter screens have limited cleaning effectiveness. Summary of the Invention

[0004] The purpose of the present disclosure is to provide a blade re-drying machine and a filter screen cleaning system and a cleaning method thereof, so as to improve the cleaning effect of the filter screen in the blade re-drying machine.

[0005] A first aspect of the present disclosure provides a filter screen cleaning system for a blade reheating machine, comprising:

[0006] a filter screen configured to block tobacco leaves from passing through a return air passage of a rehumidification zone of the leaf redrying machine;

[0007] a detector configured to detect a pressure difference ΔP between an air inlet side and an air outlet side of the filter screen;

[0008] a cleaning device comprising a compressed air blowing mechanism and / or a steam blowing mechanism, wherein the compressed air blowing mechanism is configured to blow compressed air toward the air inlet side of the filter screen, and the steam blowing mechanism is configured to blow steam toward the air inlet side of the filter screen, so as to cause tobacco leaves attached to the filter screen to fall off; and

[0009] A controller is operatively connected to the detector and the cleaning device, and is configured to determine whether to spray compressed air and / or steam toward the air inlet side of the filter screen through the cleaning device according to the pressure difference ΔP.

[0010] According to some embodiments of the present disclosure, the detector includes:

[0011] a first detection tube having an air inlet side detection end connected to the air inlet side of the filter screen;

[0012] A second detection tube having an air outlet detection end connected to the air outlet side of the filter screen; and

[0013] The pressure signal acquisition device is connected to the controller signal and is configured to acquire the pressure of the air inlet side detection end and the air outlet side detection end to obtain the pressure difference ΔP.

[0014] According to some embodiments of the present disclosure,

[0015] The compressed air blowing mechanism includes an air knife extending along a first direction, and the air knife is movably arranged along a second direction relative to the filter screen; and / or

[0016] The steam spraying mechanism includes a steam spraying pipe extending along a first direction, and the steam spraying pipe is movably arranged relative to the filter screen along a second direction;

[0017] The first direction and the second direction are perpendicular to each other, and both the first direction and the second direction are perpendicular to the thickness direction of the filter screen.

[0018] According to some embodiments of the present disclosure,

[0019] The width of the air outlet of the air knife is adjustable; and / or

[0020] The steam spray pipe has a steam spray hole, and the axis angle of the steam spray hole is adjustable.

[0021] According to some embodiments of the present disclosure, the wind knife includes a knife body and an adjusting screw, the air outlet is opened on the knife body and the two side edges in the width direction of the air outlet are deformable, the adjusting screw passes through one of the side edges and is threadedly engaged with a first screw hole provided on the other side edge, so that the spacing between the two side edges can change with the change of the mating position of the adjusting screw and the side edges.

[0022] According to some embodiments of the present disclosure,

[0023] The filter screen cleaning system includes a mounting base integrally provided with the filter screen, the cleaning device includes a first driving portion and two first guide rods, the first guide rods are movably mounted on the mounting base along the second direction, the two ends of the steam spray pipe are respectively mounted on the two first guide rods, and the first driving portion is configured to drive the first guide rods to move along the second direction;

[0024] The cleaning device includes a locking component, and two locking components are respectively provided at both ends of the steam nozzle. The locking component has a first working state and a second working state. In the first working state, the locking component locks the corresponding end of the steam nozzle to the first guide rod. In the second working state, the locking component loosens the corresponding end of the steam nozzle from the first guide rod so that the axial angle of the steam nozzle can change as the steam nozzle rotates around its own axis.

[0025] According to some embodiments of the present disclosure,

[0026] The filter screen cleaning system includes a mounting base integrally provided with the filter screen, the cleaning device includes a first driving portion and two first guide rods, the first guide rods are movably mounted on the mounting base along the second direction, the ends of the air knife and / or the steam nozzle are respectively mounted on the two first guide rods, and the first driving portion is configured to drive the first guide rods to move along the second direction;

[0027] The mounting seat is provided with a mounting hole, and the first guide rod passes through the mounting hole. The filter screen cleaning system includes a sealing member, and the sealing member is provided in the gap between the mounting hole and the first guide rod.

[0028] According to some embodiments of the present disclosure,

[0029] The filter screen cleaning system includes a mounting base integrally provided with the filter screen, the cleaning device includes a first driving portion and two first guide rods, the first guide rods are movably mounted on the mounting base along the second direction, the ends of the air knife and / or the steam nozzle are respectively mounted on the two first guide rods, and the first driving portion is configured to drive the first guide rods to move along the second direction;

[0030] A compressed air channel is provided inside the first guide rod, and the air knife is connected to the compressed air source through the compressed air channel, and / or a steam channel is provided inside the first guide rod, and the steam nozzle is connected to the steam source through the steam channel.

[0031] According to some embodiments of the present disclosure,

[0032] The cleaning device includes a cleaning mechanism configured to clean the surface of the air inlet side of the filter screen to remove tobacco leaves attached to the filter screen;

[0033] The controller is operably connected to the cleaning mechanism and is configured to determine whether to clean the surface of the air inlet side of the filter screen by the cleaning mechanism according to the pressure difference ΔP and / or the operation time of the cleaning device.

[0034] According to some embodiments of the present disclosure, the cleaning mechanism includes:

[0035] a scraping member having a scraping end for scraping tobacco leaves attached to the surface of the filter screen, the scraping member extending in a first direction and being movably arranged in a second direction relative to the filter screen; and

[0036] a reset component configured to apply a force to the scraping component so that the scraping end can press against the surface of the filter screen at a preset pressure;

[0037] The first direction and the second direction are perpendicular to each other, and both the first direction and the second direction are perpendicular to the thickness direction of the filter screen.

[0038] According to some embodiments of the present disclosure,

[0039] The filter screen cleaning system includes a mounting base integrally provided with the filter screen, the cleaning device includes a second driving portion and two second guide rods, the second guide rods are movably mounted on the mounting base along the second direction, the two ends of the scraping component are respectively mounted on the two second guide rods, and the second driving portion is configured to drive the second guide rods to move along the second direction;

[0040] The scraping component has a connecting end arranged opposite to the scraping end, and the reset component includes a spring, the two ends of the spring are respectively connected to the second guide rod and the connecting end of the scraping component, and the scraping component is rotatable around an axis along the first direction, and the rotation axis is located between the scraping end and the connecting end.

[0041] According to some embodiments of the present disclosure, the scraping end is made of a flexible material.

[0042] A second aspect of the present disclosure provides a blade redrying machine, comprising:

[0043] A fuselage having a moisture recovery zone provided therein; and

[0044] According to the first aspect of the present disclosure, the filter screen cleaning system is installed on the fuselage, wherein the filter screen is arranged in the return air channel of the moisture return zone.

[0045] According to some embodiments of the present disclosure,

[0046] The filter screen cleaning system includes a mounting base integrally provided with the filter screen, and the cleaning device is mounted on the mounting base;

[0047] The fuselage is provided with a mounting opening, and a flange is provided at the bottom of the mounting opening. The mounting seat is placed in the mounting opening and supported by the flange. The filter screen cleaning system includes a pressure plate, and the pressure plate and the fuselage are detachably connected by a threaded connection. When connected to the fuselage, the pressure plate presses the edge of the mounting seat against the flange to fix the mounting seat to the fuselage.

[0048] The third aspect of the present disclosure provides a filter screen cleaning method based on the filter screen cleaning system described in the first aspect of the present disclosure, comprising: if the pressure difference ΔP between the air inlet side and the air outlet side of the filter screen is greater than or equal to a first set threshold, compressed air and / or steam is sprayed toward the air inlet side of the filter screen through the cleaning device.

[0049] According to some embodiments of the present disclosure,

[0050] The cleaning device includes a cleaning mechanism configured to clean the surface of the air inlet side of the filter screen to remove tobacco leaves attached to the filter screen;

[0051] The cleaning method includes: after the cleaning device blows compressed air and / or steam toward the air inlet side of the filter screen for a preset time, the cleaning mechanism cleans the surface of the air inlet side of the filter screen until the pressure difference ΔP is less than or equal to a second set threshold or the operating time of the compressed air blowing mechanism and / or the steam blowing mechanism reaches a third set threshold.

[0052] In the filter screen cleaning system provided by the present disclosure, the pressure difference ΔP between the air inlet and air outlet sides of the filter screen can be used to online determine whether the filter screen is blocked by tobacco leaves. When the pressure difference ΔP increases to a certain level, it indicates that the number of blocked mesh holes on the filter screen has reached a certain number and the filter screen is seriously blocked. At this time, the compressed air blowing mechanism and / or the steam blowing mechanism can be automatically triggered to execute the cleaning process. The steam blowing mechanism can soften the clumped tobacco leaves and tobacco oil and other substances, making it easier to separate the adhering tobacco leaves from the filter screen. The compressed air blowing mechanism can directly blow away the tobacco leaves and other substances adhering to the filter screen by blowing high-speed airflow, thereby cleaning the filter screen. In addition, the cleaning device can simultaneously provide two media, steam and compressed air, to achieve dual-media collaborative cleaning, which is beneficial to improving the cleaning effect of the filter screen.

[0053] The filter screen cleaning system provided by the present disclosure can clean the filter screen online according to the pressure difference ΔP between the air inlet side and the air outlet side of the filter screen during the operation of the blade re-drying machine. Considering that the interior of the blade re-drying machine is a high temperature (60-90°C) and high humidity (relative humidity 85%-95%) environment, and the space is relatively narrow, compared with the traditional cleaning method of manually cleaning the filter screen during shutdown, the filter screen cleaning system provided by the present disclosure does not require manual disassembly of the filter screen when cleaning the filter screen, nor does it require interruption of production. It can not only reduce the risk of burns or mechanical injuries to operators, but also reduce cleaning time and improve cleaning efficiency.

[0054] The filter screen cleaning system provided by the present invention can ensure the uniformity and stability of the circulating wind field in the rehumidification zone of the leaf redrying machine by improving the cleaning effect of the filter screen, which is beneficial to improving the homogenization level of the finished tobacco leaves after leaf threshing and redrying, reducing tobacco leaf losses, and thus improving the level and capacity of tobacco processing raw material security.

[0055] The blade re-baking machine provided by the present disclosure has the advantages of the filter screen cleaning system provided by the present disclosure.

[0056] The filter screen cleaning method provided by the present disclosure can separate the adhered matter on the surface of the filter screen from the filter screen by blowing high-speed airflow and steam when the pressure difference ΔP is large and the filter screen is severely clogged. Therefore, it has the advantages of the filter screen cleaning system provided by the present disclosure.

[0057] Other features and advantages of the present disclosure will become apparent from the following detailed description of exemplary embodiments of the present disclosure with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0058] The drawings described herein are used to provide a further understanding of the present disclosure and constitute a part of this application. The illustrative embodiments of the present disclosure and their descriptions are used to explain the present disclosure and do not constitute an improper limitation of the present disclosure. In the drawings:

[0059] Figure 1 Schematic diagram of the structure of a blade re-baking machine according to some embodiments of the present disclosure.

[0060] Figure 2 This is a schematic structural diagram of a leaf redrying machine according to some embodiments of the present disclosure, taken in a cross section perpendicular to the direction of tobacco leaf conveying.

[0061] Figure 3 Schematic diagram of the structure of the filter screen cleaning system of some embodiments of the present disclosure.

[0062] Figure 4 This is a partially enlarged structural schematic diagram of the filter screen cleaning system of some embodiments of the present disclosure.

[0063] Figure 5 Schematic diagram of the structure of the air knife in some embodiments of the present disclosure.

[0064] Figure 6 This is a partially enlarged structural schematic diagram of the connection position between the first guide rod and the steam nozzle of the filter screen cleaning system of some embodiments of the present disclosure.

[0065] Figure 7 This is a partially enlarged structural schematic diagram of the filter screen cleaning system of some embodiments of the present disclosure at the connection position of the first guide rod and the steam nozzle from another perspective.

[0066] Figure 8 This is a schematic structural diagram of the filter screen cleaning system of some embodiments of the present disclosure from another perspective.

[0067] Figure 9 This is a schematic diagram of the installation method of the filter screen cleaning system on the fuselage of some embodiments of the present disclosure.

[0068] Figure 10 The present invention is a flow chart of a method for cleaning the filter screen of a blade re-baking machine according to some embodiments of the present disclosure.

[0069] In the accompanying drawings, the reference numerals represent:

[0070] A, first tide zone; B, second tide zone; C, tide discharge zone;

[0071] 10. Body; 101. Mounting port; 102. Flange; 103. Second screw hole;

[0072] 11. Filter screen;

[0073] 12. Nozzle; 13. Circulation fan;

[0074] 211. First detection tube; 212. Second detection tube; 213. Pressure signal acquisition device;

[0075] 221, air knife; 2211, knife body; 2212, adjusting screw; 2213, air outlet; 2214, connecting screw; 2215, air inlet; 222, steam nozzle; 223, first guide rod; 224, first drive motor; 225, first lead screw; 226, sealing element; 227, first connecting rod; 228, locking component;

[0076] 231, scraping member; 232, resetting member; 233, second guide rod; 234, second drive motor; 235, second lead screw; 236, second connecting rod;

[0077] 24. Controller;

[0078] 25. Mounting seat;

[0079] 26. Seals;

[0080] 27. Press plate. DETAILED DESCRIPTION

[0081] The following will be combined with the drawings in the embodiments of the present disclosure to clearly and completely describe the technical solutions in the embodiments of the present disclosure. Obviously, the described embodiments are only part of the embodiments of the present disclosure, rather than all the embodiments. The following description of at least one exemplary embodiment is actually only illustrative and is in no way intended to limit the present disclosure and its application or use. Based on the embodiments in the present disclosure, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present disclosure.

[0082] Unless otherwise specifically stated, the relative arrangement of the parts and steps, numerical expressions and numerical values ​​set forth in these embodiments do not limit the scope of the present disclosure. At the same time, it should be understood that, for ease of description, the sizes of the various parts shown in the accompanying drawings are not drawn according to actual proportional relationships. The techniques, methods and equipment known to those of ordinary skill in the relevant art may not be discussed in detail, but in appropriate cases, these techniques, methods and equipment should be considered as part of the specification. In all examples shown and discussed here, any specific values ​​should be interpreted as being merely exemplary, rather than as limitations. Therefore, other examples of the exemplary embodiments may have different values. It should be noted that similar numbers and letters represent similar items in the following figures, and therefore, once an item is defined in one figure, it does not need to be further discussed in subsequent figures.

[0083] In the description of the present disclosure, it should be understood that the use of words such as "first" and "second" to limit components is only for the convenience of distinguishing the corresponding components. Unless otherwise stated, the above words have no special meaning and therefore cannot be understood as limiting the scope of protection of the present disclosure.

[0084] In the description of the present disclosure, it should be understood that the directions or positional relationships indicated by directional words such as "front, back, up, down, left, right", "horizontal, vertical, perpendicular, horizontal" and "top, bottom" are usually based on the directions or positional relationships shown in the accompanying drawings. They are only for the convenience of describing the present disclosure and simplifying the description. Unless otherwise specified, these directional words do not indicate or imply that the device or element referred to must have a specific direction or be constructed and operated in a specific direction. Therefore, they cannot be understood as limiting the scope of protection of the present disclosure; the directional words "inside and outside" refer to the inside and outside relative to the outline of each component itself.

[0085] Figure 1 and Figure 2The structure of a blade redrying machine in the related art is shown.

[0086] After tobacco leaves and other materials enter the leaf redrying machine, they are first dried in the drying zone along a conveyor belt. Circulating hot air blown upward from the bottom dries the moist tobacco leaves. As the material continues to move forward, the temperature of the leaves gradually drops. Once most of the moisture has evaporated, the circulating hot air continues to dry the leaves from top to bottom, and the moist air continues to be exhausted. After exiting the drying zone, the leaves enter the cooling zone. In this zone, the cooler circulating air lowers the temperature of the leaves, creating the necessary conditions for them to regain moisture.

[0087] Finally, the tobacco leaves pass through a longer rehumidification channel. Figure 1 The leaf reheating machine consists of a first rehumidification zone A, a second rehumidification zone B, and a dehumidification zone C. The structural layout of the first and second rehumidification zones A and B is essentially the same. After entering the rehumidification channel, the tobacco leaves are rehumidified in the first and second rehumidification zones A and B, respectively. After fully absorbing heat and moisture, they are delivered to the discharge end.

[0088] The blade redrying machine's body 10 is equipped with multiple nozzles 12 and a circulating fan 13. In the first and second rehumidification zones A and B, the circulating fan 13 forces appropriate amounts of steam and water mist through the tobacco leaves, then draws away the air, creating a circulating air duct within the body 10. In the first rehumidification zone A, the circulating air rises relative to the tobacco leaves, while in the second rehumidification zone B, it descends relative to the leaves. During this period, water mist is sprayed onto the tobacco leaves, while steam adheres to them and condenses into water, continuously humidifying and heating them. A filter screen 11 is installed in the return air passage of the circulating air duct. This filter screen 11 prevents tobacco leaves from being carried into the impeller and nozzles 12 of the circulating fan 13 by the wind, minimizing tobacco leaf loss.

[0089] In the process of implementing the technical solution disclosed in the present invention, the inventors found that since the blade re-drying machine is in continuous operation, its rehumidification zone is a high-temperature and high-humidity environment, and the tobacco sheets have different sizes. At the same time, due to the unevenness of the circulating wind field, small and medium-sized tobacco sheets are easily blown up by the wind and carried to the filter screen 11. The high-humidity environment and the high water content of the fragments themselves cause the fragments adhering to the filter screen 11 to become increasingly solid and increasingly difficult to clean, causing the mesh of the filter screen 11 to be seriously clogged, and further increasing the wind speed of other unblocked meshes, causing more fragments to be blown up and adsorbed on the mesh.

[0090] Due to the continuous operation of the equipment, the area where the filter screen 11 is located is foggy and has poor visibility. The fan impeller, driven by other fans, also rotates, making cleaning the filter screen 11 extremely dangerous and difficult. Furthermore, regular cleaning of the filter screen 11 takes a long time, and the need to enter the re-drying machine to clean the tobacco leaves on the filter screen 11 is extremely difficult. After cleaning, the filter screen 11 quickly becomes clogged again.

[0091] In view of this, reference Figures 1 to 10 Some embodiments of the present disclosure provide a filter screen cleaning system for a blade re-baking machine, including a filter screen 11, a detector, a cleaning device, and a controller 24.

[0092] The filter screen 11 is configured to block tobacco leaves from passing through the return air passage of the rehumidification zone of the leaf re-drying machine. The detector is configured to detect the pressure difference ΔP between the air inlet and air outlet sides of the filter screen 11. The cleaning device includes a compressed air blowing mechanism and / or a steam blowing mechanism. The compressed air blowing mechanism is configured to blow compressed air toward the air inlet side of the filter screen 11, and the steam blowing mechanism is configured to blow steam toward the air inlet side of the filter screen 11 to remove tobacco leaves adhered to the filter screen 11. The controller 24 is operably connected to the detector and the cleaning device and is configured to determine whether to blow compressed air and / or steam toward the air inlet side of the filter screen 11 via the cleaning device based on the pressure difference ΔP.

[0093] In the filter screen cleaning system provided by the embodiments of the present disclosure, the pressure difference ΔP between the air inlet and air outlet sides of the filter screen 11 can be used to online determine whether the filter screen is blocked by tobacco leaves. When the pressure difference ΔP increases to a certain level, indicating that the number of blocked mesh holes on the filter screen 11 has reached a certain level and the filter screen is severely blocked, the compressed air blowing mechanism and / or the steam blowing mechanism can be automatically triggered to execute the cleaning process. The steam blowing mechanism can soften the clumped tobacco leaves and tobacco oil and other substances, facilitating the separation of the adhering tobacco leaves from the filter screen 11. The compressed air blowing mechanism can directly blow away the tobacco leaves and other substances adhering to the filter screen 11 by blowing high-speed air, thereby cleaning the filter screen 11. In addition, the cleaning device can simultaneously provide both steam and compressed air as two media, achieving dual-media synergistic cleaning, which is beneficial to improving the cleaning effect of the filter screen 11.

[0094] The filter screen cleaning system provided in the embodiment of the present disclosure can clean the filter screen online according to the pressure difference ΔP between the air inlet side and the air outlet side of the filter screen 11 during the operation of the blade re-drying machine. Considering that the interior of the blade re-drying machine is a high temperature (60-90°C) and high humidity (relative humidity 85%-95%) environment, and the space is relatively narrow, compared with the traditional cleaning method of manually cleaning the filter screen by stopping the machine, the filter screen cleaning system provided in the embodiment of the present disclosure does not require manual disassembly of the filter screen 11 when cleaning the filter screen 11, nor does it require interruption of production. It can not only reduce the risk of burns or mechanical injuries to operators, but also reduce cleaning time and improve cleaning efficiency.

[0095] The filter screen cleaning system provided by the embodiments of the present disclosure can ensure the uniformity and stability of the circulating wind field in the rehumidification zone of the leaf redrying machine by improving the cleaning effect of the filter screen, which is beneficial to improving the homogenization level of the finished tobacco leaves after leaf beating and redrying, reducing tobacco leaf losses, and thus improving the level and capacity of tobacco processing raw material security.

[0096] In some embodiments, reference Figure 3 The detector includes a first detection tube 211, a second detection tube 212, and a pressure signal acquisition device 213. The first detection tube 211 has an inlet detection end connected to the air inlet side of the filter screen 11. The second detection tube 212 has an outlet detection end connected to the air outlet side of the filter screen 11. The pressure signal acquisition device 213 is signal-connected to the controller 24 and is configured to acquire the pressures at the inlet and outlet detection ends to obtain a pressure differential ΔP.

[0097] Optionally, the first detection tube 211 and the second detection tube 212 are stainless steel tubes with an outer diameter of 8 mm and a wall thickness of 1.5 mm. Optionally, the pressure signal acquisition device 213 is a high-precision differential pressure meter with a measurement range of 0-500 Pa and an accuracy of ±1 Pa.

[0098] In some embodiments, reference Figures 3 to 5 The compressed air blowing mechanism includes an air knife 221 extending along a first direction y. The air knife 221 is movably disposed along a second direction z relative to the filter screen 11. The first direction y and the second direction z are perpendicular to each other and are both perpendicular to the thickness direction x of the filter screen 11.

[0099] Optionally, the air knife 221 is made of aluminum alloy. Optionally, the outlet air pressure of the air knife 221 is 0.4-0.8 MPa and the outlet air speed is 15-25 m / s.

[0100] In some embodiments, reference Figure 3 、 Figure 4 、 Figure 6 and Figure 7The steam injection mechanism includes a steam injection pipe 222 extending along a first direction y. The steam injection pipe 222 is movably disposed along a second direction z relative to the filter screen 11. The first direction y and the second direction z are perpendicular to each other and are both perpendicular to the thickness direction x of the filter screen 11.

[0101] Optionally, the steam nozzle 222 is made of stainless steel. Optionally, the steam pressure of the steam nozzle 222 is 0.3-0.6 MPa and the steam temperature is 120-150°C.

[0102] In this embodiment, the surface of the air inlet side of the filter screen 11 is perpendicular to the first direction y and the second direction. By extending the air knife 221 and the steam nozzle 222 along the first direction y and being movably arranged along the second direction z, the blowing range of compressed air and steam can cover the entire filter screen 11, thereby presenting a good cleaning effect.

[0103] In some embodiments, reference Figure 5 The width of the air outlet 2213 of the wind knife 221 is adjustable.

[0104] Optionally, the width of the air outlet 2213 can be adjusted within a range of 5-15 mm.

[0105] In some embodiments, reference Figure 6 and Figure 7 The steam nozzle 222 has a steam nozzle hole, and the axis angle of the steam nozzle hole is adjustable.

[0106] Optionally, the adjustment range of the axis angle of the steam spray hole is ±30°, wherein the horizontal direction is 0°. Optionally, the plurality of steam spray holes are arranged at intervals along the first direction y.

[0107] In this embodiment, the air pressure and airflow shape of the air knife 221 can be adjusted by adjusting the width of the air outlet 2213 of the air knife 221. The steam spray angle relative to the filter screen 11 can be adjusted by adjusting the axis angle of the steam spray hole. This structural arrangement facilitates adapting to the cleaning needs of different materials and equipment.

[0108] In some embodiments, reference Figure 5 The wind knife 221 includes a blade body 2211 and an adjusting screw 2212. The air outlet 2213 is opened on the blade body 2211 and the two sides of the air outlet 2213 in the width direction are deformable. The adjusting screw 2212 passes through one of the side edges and is threadedly engaged with the first screw hole set in the other side edge, so that the distance between the two side edges can change with the change of the matching position of the adjusting screw 2212 and the side edge.

[0109] Optionally, the wind knife 221 includes a plurality of adjusting screws 2212 , and the plurality of adjusting screws 2212 are arranged at intervals and arranged along the first direction y.

[0110] Optionally, a connecting screw 2214 and an air inlet 2215 are provided at each end of the air knife 221 along the first direction y. The cleaning device includes a first drive unit and two first guide rods 223. The first guide rods 223 are movably mounted on the mounting base 25 along the second direction z. The connecting screw 2214 is threadedly connected to one of the guide rods 233. A compressed air passage is provided within at least one of the first guide rods 223. The air inlet 2215 of the air knife 221 is threaded. The outlet of the compressed air passage is provided at the end of the first guide rod 233 along the second direction z and is also threaded. The air inlet 2215 is fitted over the outlet of the compressed air passage.

[0111] In this embodiment, by screwing the adjusting screw 2212, the matching position of the adjusting screw 2212 and one of the side edges in the width direction of the air outlet 2213 changes, thereby deforming the side edge and changing the distance between the two side edges accordingly, thereby adjusting the width of the air outlet 2213.

[0112] In some embodiments, reference Figure 3 、 Figure 4 、 Figure 6 and Figure 7 The filter screen cleaning system includes a mounting base 25 integrally formed with the filter screen 11. The cleaning device includes a first driving unit and two first guide rods 223. The first guide rods 223 are movably mounted on the mounting base 25 along a second direction z. The steam nozzle 222 is mounted at both ends of the two first guide rods 223. The first driving unit is configured to drive the first guide rods 223 to move along the second direction z. The cleaning device includes a locking component 228. Two locking components 228 are provided at each end of the steam nozzle 222. The locking components 228 have a first operating state and a second operating state. In the first operating state, the locking component 228 locks the corresponding end of the steam nozzle 222 to the first guide rod 223. In the second operating state, the locking component 228 releases the corresponding end of the steam nozzle 222 from the first guide rod 223, thereby allowing the axial angle of the steam spray hole to change as the steam nozzle 222 rotates about its own axis.

[0113] Optionally, refer to Figure 3The first drive unit includes a first drive motor 224 and a first lead screw 225. The first drive motor 224 is connected to the first lead screw 225 in a transmission manner to drive the first lead screw 225 to rotate. Optionally, the lead of the first lead screw 225 is 5 mm, and the stroke L=Lz+100, in mm, where Lz represents the dimension of the filter screen 11 along the second direction z. Optionally, the straightness of the first guide rod 223 is ≤0.05 mm / m. The first drive motor 224 and the first lead screw 225 can be connected to each other through a coupling or a worm gear or other structure, or the output shaft of the first drive motor 224 can also directly drive the first lead screw 225 to rotate. The first drive motor 224 can be, for example, a servo motor.

[0114] Optionally, refer to Figure 3 The cleaning device includes a first connecting rod 227, which extends along a first direction y. The two ends of the first connecting rod 227 are respectively connected to the two first guide rods 223, and the middle portion of the first connecting rod 227 is connected to a nut adapted for the first lead screw 225. Thus, when the first drive motor 224 drives the first lead screw 225 to rotate, the nut adapted for the first lead screw 225 moves along the second direction z with the rotation of the first lead screw 225, thereby driving the first connecting rod 227 and the first guide rod 223 to move along the second direction z.

[0115] Optionally, the locking component 228 is a locking nut, the internal thread of the locking nut is matched with the end thread of the steam nozzle 222, the end of the steam nozzle 222 can be rotatably mounted on the end of the first guide rod 223 along the second direction z, and the end of the first guide rod 223 along the second direction z is provided with a positioning plane perpendicular to the axis of the steam nozzle 222. In the first working state of the locking component 228, the end face of the locking nut facing the first guide rod 223 is pressed against the positioning plane, and in the second working state of the locking component 228, the end face of the locking nut facing the first guide rod 223 is separated from the positioning plane.

[0116] In this embodiment, in the first operating position of the locking member 228, the steam nozzle 222 is rotatably mounted about its own axis between the two first guide rods 223. Rotating the steam nozzle 222 adjusts the axial angle of the steam nozzle. When the axial angle of the steam nozzle is adjusted to the desired angle, the locking member 228 is switched from the first operating position to the second operating position by rotating the locking member 228, thereby securing the steam nozzle 222 relative to the first guide rods 223 and maintaining the axial angle of the steam nozzle at the desired angle.

[0117] In some embodiments, reference Figure 3The filter screen cleaning system includes a mounting base 25 integrally formed with the filter screen 11. The cleaning device includes a first driving unit and two first guide rods 223. The first guide rods 223 are movable along a second direction z through the mounting base 25. The air knife 221 and / or steam nozzle 222 are mounted at both ends of the two first guide rods 223. The first driving unit is configured to drive the first guide rods 223 to move along the second direction z. The mounting base 25 is provided with a mounting hole, through which the first guide rods 223 pass. The filter screen cleaning system includes a seal 226 disposed in the gap between the mounting hole and the first guide rods 223.

[0118] Optionally, the sealing member 226 is a silicone sealing ring.

[0119] The cleaning device can be mounted to the blade reheating machine's body 10 via a mounting base 25. Specifically, the mounting base 25 can serve as a portion of the blade reheating machine's body 10. A portion of the first guide rod 223 is located on the side of the mounting base 25 where the filter screen 11 is located, internal to the body 10, while another portion is located on the side opposite the side where the filter screen 11 is located along the second direction z, external to the body 10. In this embodiment, a seal 226 is provided in the gap between the mounting hole and the first guide rod 223 to reduce the risk of steam leakage during the cleaning process.

[0120] In some embodiments, reference Figure 3 The filter screen cleaning system includes a mounting base 25 integrally formed with the filter screen 11. The cleaning device includes a first drive unit and two first guide rods 223. The first guide rods 223 are movable through the mounting base 25 in a second direction z. The air knife 221 and / or the steam nozzle 222 are mounted at both ends of the first guide rods 223. The first drive unit is configured to drive the first guide rods 223 to move in the second direction z. The first guide rods 223 are internally provided with compressed air passages, through which the air knife 221 is connected to a compressed air source. Alternatively, the first guide rods 223 are internally provided with steam passages, through which the steam nozzle 222 is connected to a steam source.

[0121] In this embodiment, the first guide rod 223 passes through the mounting seat 25. By arranging the compressed air channel and the steam channel inside the first guide rod 223, the two ends of the first guide rod 223 along the second direction z can be connected to the compressed air source and the wind knife 221 respectively. Similarly, the two ends of the first guide rod 223 along the second direction z can be connected to the steam source and the steam nozzle 222 respectively. There is no need to set up additional compressed air pipelines and steam pipelines, which is conducive to simplifying the structure of the filter screen cleaning system and facilitating assembly. The wind knife 221 and the steam nozzle 222 are not easily interfered with by the pipeline when moving along the second direction z.

[0122] In some embodiments, the cleaning device includes a cleaning mechanism configured to clean the surface of the air inlet side of the filter screen 11 to remove tobacco leaves adhered to the filter screen 11. The controller 24 is operably connected to the cleaning mechanism and configured to determine whether to clean the surface of the air inlet side of the filter screen 11 using the cleaning mechanism based on the pressure difference ΔP and / or the operating time of the cleaning device.

[0123] Optionally, the controller 24 is configured to determine whether to clean the air inlet side surface of the filter screen 11 using the cleaning mechanism based on the operating time of the compressed air blowing mechanism and the steam blowing mechanism. Optionally, the controller 24 is configured to activate the cleaning mechanism after the compressed air blowing mechanism and the steam blowing mechanism have been operating synchronously for a preset time.

[0124] In this embodiment, after compressed air and / or steam are sprayed onto the filter screen 11, tobacco leaves and other substances still adhering to the surface of the filter screen 11 can be further cleaned by a cleaning mechanism. The steam blowing mechanism, the compressed air blowing mechanism and the cleaning mechanism cooperate with each other to form a multi-stage cleaning process of steam softening, high-pressure blowing off and mechanical scraping, which is beneficial to improving the cleaning effect of complex adhesions on the surface of the filter screen 11. The tobacco leaves blown off or scraped off can fall back into the main mesh belt of the leaf re-drying machine, reducing the loss of tobacco leaves.

[0125] This multi-stage cleaning device and cleaning process is not only applicable to the cleaning of the filter screen 11 of the blade re-baking machine, but also applicable to the cleaning of other screens with similar structures.

[0126] In some embodiments, reference Figure 3 and Figure 8 The cleaning mechanism includes a scraping member 231 and a resetting member 232. The scraping member 231 has a scraping end for scraping tobacco leaves adhered to the surface of the filter screen 11. The scraping member 231 extends along a first direction y and is movable relative to the filter screen 11 along a second direction z. The resetting member 232 is configured to apply a force to the scraping member 231, causing the scraping end to press against the surface of the filter screen 11 with a predetermined pressure. The first direction y and the second direction z are perpendicular to each other and are both perpendicular to the thickness direction x of the filter screen 11.

[0127] Optionally, the scraping member 231 is plate-shaped. Optionally, the controller 24 is configured to make the scraping member 231 reciprocate along the second direction z at a speed of 0.1-0.3 m / s. This speed range can take into account both cleaning efficiency and cleaning effect.

[0128] In this embodiment, when the scraping member 231 moves along the second direction z, the scraping end of the scraping member 231 always presses against the surface of the filter screen 11 with an appropriate pressure under the action of the reset member 232. This prevents the force exerted by the scraping end on the surface of the filter screen 11 from being too small, which helps maintain the effect of the scraping member 231 in scraping off adhered materials. In addition, the force exerted by the scraping end on the surface of the filter screen 11 from being too large helps reduce the wear of the scraping end and the filter screen 11.

[0129] In some embodiments, reference Figure 3 and Figure 8 The filter screen cleaning system includes a mounting base 25 integrally formed with the filter screen 11. The cleaning device includes a second driving unit and two second guide rods 233. The second guide rods 233 are movably mounted on the mounting base 25 along a second direction z. The scraping member 231 has two ends mounted to the two second guide rods 233, respectively. The second driving unit is configured to drive the second guide rods 233 to move along the second direction z. The scraping member 231 has a connecting end opposite the scraping end. The reset member 232 includes a spring, the ends of which are respectively connected to the second guide rods 233 and the connecting end of the scraping member 231. The scraping member 231 is rotatable about an axis along the first direction y, with the rotation axis located between the scraping end and the connecting end.

[0130] Optionally, refer to Figure 3 The second drive unit includes a second drive motor 234 and a second lead screw 235. The second drive motor 234 is in transmission connection with the second lead screw 235 to drive the second lead screw 235 to rotate. The specifications and connection method of the second drive motor 234 and the second lead screw 235 can refer to the specifications and connection method of the first drive motor 224 and the first lead screw 225. For example, the specifications and connection method of the second drive motor 234 and the second lead screw 235 are the same as those of the first drive motor 224 and the first lead screw 225, and are not further described here.

[0131] Optionally, refer to Figure 3 The cleaning device includes a second connecting rod 236, which extends along the second direction z. The two ends of the second connecting rod 236 are respectively connected to the two second guide rods 233, and the middle part of the second connecting rod 236 is connected to a nut adapted for the second screw 235 to achieve a function similar to that of the first connecting rod 227.

[0132] Optionally, the spring is a compression spring with an elastic coefficient k=5-10 N / mm. The above arrangement enables the scraping end of the scraping member 231 to act on the surface of the filter screen 11 with a contact pressure of 0.5-1.0 N / cm².

[0133] In this embodiment, when the scraping member 231 is scraping residues on the surface of the filter screen 11, if the scraping end of the scraping member 231 tends to separate from the surface of the filter screen 11, the spring of the reset member 232 drives the connecting end of the scraping member 231 to move and rotate, so that the connecting end of the scraping member 231 is reset, thereby maintaining sufficient contact pressure on the scraping end to maintain the cleaning effect.

[0134] In some embodiments, the scraper tip is made of a flexible material.

[0135] Optionally, the scraping component 231 includes a main body made of stainless steel, and the scraping end is arranged on one side of the main body and is made of food-grade silicone with a Shore hardness of 50-60A.

[0136] In this embodiment, the portion of the scraping component 231 that contacts the filter screen 11 is made of a flexible material, and the scraping end can adapt to the deformation of the surface of the filter screen 11 and fit closely with the surface of the filter screen 11. While maintaining the scraping effect, the risk of damaging the surface of the filter screen 11 can be reduced, which is conducive to extending the service life of the scraping component 231 and the filter screen 11.

[0137] Some embodiments of the present disclosure further provide a blade reheating machine, comprising a body 10 and a filter screen cleaning system according to embodiments of the present disclosure. A moisture return zone is provided within body 10. The filter screen cleaning system is mounted on body 10, wherein a filter screen 11 is disposed in the return air duct of the moisture return zone.

[0138] The blade re-baking machine provided by the embodiment of the present disclosure has the advantages of the filter screen cleaning system provided by the embodiment of the present disclosure.

[0139] In some embodiments, reference Figure 9 The filter screen cleaning system includes a mounting base 25 integrally formed with the filter screen 11, and a cleaning device is mounted on the mounting base 25. The housing 10 is provided with a mounting opening 101, and a flange 102 is provided at the bottom of the mounting opening 101. The mounting base 25 is placed in the mounting opening 101 and supported by the flange 102. The filter screen cleaning system includes a pressure plate 27, which is detachably connected to the housing 10 via a threaded connection. When connected to the housing 10, the pressure plate 27 presses the edge of the mounting base 25 against the flange 102 to secure the mounting base 25 to the housing 10.

[0140] Optionally, the mounting base 25 and the pressure plate 27 are made of stainless steel. Optionally, the pressure plates 27 are disposed at both ends of the mounting base 25 along the first direction y. The pressure plate 27 is provided with through holes. By passing a threaded connector through the pressure plate 27 and engaging with the second screw holes 103 provided around the mounting opening, the pressure plate 27 can be pressed against the mounting base 25, thereby securing the mounting base 25 to the body 10. Optionally, the threaded connector is an M12 bolt.

[0141] The filter screen cleaning system can be implemented as an integral module, securely mounted to the housing 10 via the mounting base 25 in this embodiment. If the filter screen cleaning system malfunctions, the threaded connector and pressure plate 27 can be removed from the housing 10. The cleaning device, along with the mounting base 25 and filter screen 11, can then be lifted out for repair. This disassembly process can be completed in less than 30 minutes, improving operational efficiency and eliminating the need for operators to enter the confined interior of the housing 10, minimizing safety risks.

[0142] refer to Figure 10 Some embodiments of the present disclosure also provide a filter screen cleaning method based on the aforementioned filter screen cleaning system, including: if the pressure difference ΔP between the air inlet side and the air outlet side of the filter screen 11 is greater than or equal to a first set threshold, compressed air and / or steam is sprayed toward the air inlet side of the filter screen 11 through a cleaning device.

[0143] The filter screen cleaning method provided by the embodiment of the present disclosure can separate the adhered matter on the surface of the filter screen 11 from the filter screen 11 by blowing high-speed airflow and steam, etc. when the pressure difference ΔP is large and the filter screen is seriously clogged. Therefore, it has the advantages of the filter screen cleaning system provided by the embodiment of the present disclosure.

[0144] In some embodiments, the cleaning device includes a cleaning mechanism, which is configured to clean the surface of the air inlet side of the filter screen 11 to remove tobacco leaves attached to the filter screen 11; the cleaning method includes: after the cleaning device blows compressed air and / or steam to the air inlet side of the filter screen 11 for a preset period of time, the cleaning mechanism cleans the surface of the air inlet side of the filter screen 11 until the pressure difference ΔP is less than or equal to the second set threshold or the operating time of the compressed air blowing mechanism and / or the steam blowing mechanism reaches a third set threshold.

[0145] In this embodiment, when the filter screen cleaning system meets at least one of the following operating conditions: the pressure differential ΔP is less than or equal to the second set threshold, and the operating time of the compressed air blowing mechanism and / or the steam blowing mechanism reaches a third set threshold, it indicates that the previous cleaning process has achieved a good cleaning effect and the cleaning process can be stopped. At this time, the compressed air mechanism, the steam blowing mechanism, and the cleaning mechanism are all reset, for example, to a position that avoids the return air duct of the blade re-drying machine to allow the circulating air to pass smoothly through the return air duct. As the blade re-drying machine continues to operate, if the pressure differential ΔP is greater than or equal to the first set threshold, the aforementioned cleaning process is triggered again.

[0146] The values ​​of the first set threshold, the second set threshold, and the third set threshold can be determined according to the type of material adhered to the filter screen 11. In some embodiments, the first set threshold is in the range of 150-200 Pa, the second set threshold is in the range of 0-50 Pa, and the third set threshold is 5 min.

[0147] The filter screen cleaning methods of some embodiments of the present disclosure are further described below with reference to the accompanying drawings.

[0148] The filter screen cleaning system includes a detector, a compressed air blowing mechanism, a steam blowing mechanism, a cleaning mechanism, a first drive motor 224, a first lead screw 225, a first connecting rod 227, a first guide rod 223, a second drive motor 234, a second lead screw 235, a second connecting rod 236, a second guide rod 233, and a controller 24. The compressed air blowing mechanism includes an air knife 221, the steam blowing mechanism includes a steam nozzle 222, and the cleaning mechanism includes a scraping component 231 and a reset component 232. The detailed structure, connection relationships, and functions of each component can be found in the previous description.

[0149] The filter screen cleaning method includes the following steps.

[0150] When the pressure difference ΔP between the air inlet side and the air outlet side of the filter screen 11 is greater than a first set threshold (eg, 150 Pa), the cleaning process is triggered.

[0151] The compressed air and steam injection mechanisms are activated, with compressed air being injected through air knife 221 and steam being injected through steam nozzle 222. The air knife 221 and steam nozzle 222 operate synchronously for 30-60 seconds, reciprocating along the second direction z. During this process, the compressed air injection mechanism has an outlet pressure of 0.4-0.8 MPa and an outlet velocity of 15-25 m / s. The steam injection mechanism has a steam pressure of 0.3-0.6 MPa and a steam temperature of 120-150°C.

[0152] After the compressed air and steam injection processes are complete, the cleaning mechanism is activated, wherein the scraping end of the scraping member 231 is moved back and forth along the second direction z on the air inlet side of the filter screen 11 2-3 times, each time taking 20-30 seconds. During this process, the scraping end of the scraping member 231 moves at a speed of 0.1-0.3 m / s.

[0153] When the pressure difference ΔP is less than or equal to the second set threshold value (for example, 50Pa), or the set cleaning time (for example, 5 minutes) is reached, or the operating time of the compressed air blowing mechanism and the steam blowing mechanism has reached the third set threshold value (for example, 5 minutes), the compressed air blowing mechanism, the steam blowing mechanism and the cleaning mechanism are reset to their initial positions.

[0154] Based on the above-mentioned filter screen cleaning method, compared with traditional manual cleaning methods, the time required for a single filter screen cleaning can be reduced from 2-4 hours to 5-8 minutes. After cleaning, the permeability of the filter screen can be increased from 60% or less to 95% or more, and the fluctuation degree of wind field uniformity can be reduced from 15% or more to 5% or less. This saves approximately 1,500 kWh of energy annually and effectively reduces the risk of maintenance personnel coming into contact with the interior of the blade re-baking machine.

[0155] In some embodiments, the controller described above can be implemented as a general-purpose processor, a programmable logic controller (PLC), a digital signal processor (DSP), an application-specific integrated circuit (ASIC), a field-programmable gate array (FPGA), or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, or any appropriate combination thereof for performing the functions described in the present disclosure.

[0156] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present disclosure and are not intended to limit them. Although the present disclosure has been described in detail with reference to preferred embodiments, ordinary technicians in the relevant field should understand that the specific implementation methods of the present disclosure can still be modified or some technical features can be replaced by equivalents, which should all be included in the scope of the technical solutions claimed for protection in the present disclosure.

Claims

1. A filter screen cleaning system for a blade reheating machine, characterized in that: include: A filter screen (11) is configured to block tobacco leaves from passing through a return air passage of a rehumidification zone of the leaf redrying machine; A detector configured to detect a pressure difference ΔP between an air inlet side and an air outlet side of the filter screen (11); A cleaning device comprising a compressed air blowing mechanism and / or a steam blowing mechanism, wherein the compressed air blowing mechanism is configured to blow compressed air toward the air inlet side of the filter screen (11), and the steam blowing mechanism is configured to blow steam toward the air inlet side of the filter screen (11) to cause tobacco leaves attached to the filter screen (11) to fall off; and A controller (24) is operably connected to the detector and the cleaning device and is configured to determine whether to spray compressed air and / or steam to the air inlet side of the filter screen (11) through the cleaning device according to the pressure difference ΔP.

2. The filter screen cleaning system according to claim 1, characterized in that: The detector comprises: A first detection tube (211) having an air inlet side detection end connected to the air inlet side of the filter screen (11); a second detection tube (212) having an air outlet detection end connected to the air outlet side of the filter screen (11); and The pressure signal acquisition device (213) is connected to the controller (24) by signal, and is configured to acquire the pressures of the air inlet side detection end and the air outlet side detection end to obtain the pressure difference ΔP.

3. The filter screen cleaning system according to claim 1, characterized in that: The compressed air blowing mechanism comprises an air knife (221) extending along a first direction (y), the air knife (221) being movably arranged along a second direction (z) relative to the filter screen (11); and / or The steam spraying mechanism comprises a steam spraying pipe (222) extending along a first direction (y), and the steam spraying pipe (222) is movably arranged along a second direction (z) relative to the filter screen (11); The first direction (y) and the second direction (z) are perpendicular to each other, and both the first direction (y) and the second direction (z) are perpendicular to the thickness direction (x) of the filter screen (11).

4. The filter screen cleaning system according to claim 3, characterized in that: The width of the air outlet (2213) of the air knife (221) is adjustable; and / or The steam spray pipe (222) has a steam spray hole, and the axis angle of the steam spray hole is adjustable.

5. The filter screen cleaning system according to claim 4, characterized in that: The wind knife (221) comprises a knife body (2211) and an adjusting screw (2212); the air outlet (2213) is provided on the knife body (2211), and the two side edges of the air outlet (2213) in the width direction are deformable; the adjusting screw (2212) passes through one of the side edges and is threadedly engaged with a first screw hole provided in the other side edge, so that the distance between the two side edges can change as the engagement position of the adjusting screw (2212) and the side edges changes.

6. The filter screen cleaning system according to claim 4, characterized in that: The filter screen cleaning system comprises a mounting seat (25) integrally provided with the filter screen (11); the cleaning device comprises a first driving portion and two first guide rods (223); the first guide rods (223) are movably mounted on the mounting seat (25) along the second direction (z); both ends of the steam spray pipe (222) are respectively mounted on the two first guide rods (223); the first driving portion is configured to drive the first guide rods (223) to move along the second direction (z); The cleaning device includes a locking component (228), and two locking components (228) are respectively provided at both ends of the steam nozzle (222). The locking component (228) has a first working state and a second working state. In the first working state, the locking component (228) locks the corresponding end of the steam nozzle (222) to the first guide rod (223). In the second working state, the locking component (228) releases the corresponding end of the steam nozzle (222) from the first guide rod (223), so that the axial angle of the steam nozzle hole can change as the steam nozzle (222) rotates around its own axis.

7. The filter screen cleaning system according to claim 3, characterized in that: The filter screen cleaning system comprises a mounting seat (25) integrally provided with the filter screen (11); the cleaning device comprises a first driving portion and two first guide rods (223); the first guide rods (223) are movably passed through the mounting seat (25) along the second direction (z); both ends of the air knife (221) and / or the steam nozzle (222) are respectively mounted on the two first guide rods (223); the first driving portion is configured to drive the first guide rods (223) to move along the second direction (z); The mounting seat (25) is provided with a mounting hole, the first guide rod (223) passes through the mounting hole, and the filter screen cleaning system comprises a sealing member (226), the sealing member (226) being provided in a gap between the mounting hole and the first guide rod (223).

8. The filter screen cleaning system according to claim 3, characterized in that: The filter screen cleaning system comprises a mounting seat (25) integrally provided with the filter screen (11); the cleaning device comprises a first driving portion and two first guide rods (223); the first guide rods (223) are movably passed through the mounting seat (25) along the second direction (z); both ends of the air knife (221) and / or the steam nozzle (222) are respectively mounted on the two first guide rods (223); the first driving portion is configured to drive the first guide rods (223) to move along the second direction (z); A compressed air channel is provided inside the first guide rod (223), and the air knife (221) is connected to a compressed air source via the compressed air channel; and / or a steam channel is provided inside the first guide rod (223), and the steam nozzle (222) is connected to a steam source via the steam channel.

9. The filter screen cleaning system according to any one of claims 1 to 8, characterized in that: The cleaning device comprises a cleaning mechanism, wherein the cleaning mechanism is configured to clean the surface of the air inlet side of the filter screen (11) so as to cause tobacco leaves attached to the filter screen (11) to fall off; The controller (24) is operably connected to the cleaning mechanism and is configured to determine whether to clean the surface of the air inlet side of the filter screen (11) through the cleaning mechanism according to the pressure difference ΔP and / or the operating time of the cleaning device.

10. The filter screen cleaning system according to claim 9, characterized in that: The cleaning mechanism comprises: a scraping member (231) having a scraping end for scraping tobacco leaves attached to the surface of the filter screen (11), the scraping member (231) extending along a first direction (y) and being movably arranged relative to the filter screen (11) along a second direction (z); and a reset component (232) configured to apply a force to the scraping component (231) so that the scraping end can abut against the surface of the filter screen (11) at a preset pressure; The first direction (y) and the second direction (z) are perpendicular to each other, and both the first direction (y) and the second direction (z) are perpendicular to the thickness direction (x) of the filter screen (11).

11. The filter screen cleaning system according to claim 10, characterized in that: The filter screen cleaning system comprises a mounting seat (25) integrally provided with the filter screen (11); the cleaning device comprises a second driving portion and two second guide rods (233); the second guide rods (233) are movably mounted on the mounting seat (25) along the second direction (z); both ends of the scraping component (231) are respectively mounted on the two second guide rods (233); the second driving portion is configured to drive the second guide rods (233) to move along the second direction (z); The scraping component (231) has a connecting end arranged opposite to the scraping end, the reset component (232) includes a spring, the two ends of the spring are respectively connected to the second guide rod (233) and the connecting end of the scraping component (231), and the scraping component (231) is rotatable around an axis along the first direction (y), and the rotation axis is located between the scraping end and the connecting end.

12. The filter screen cleaning system according to claim 10, characterized in that: The scraping end is made of a flexible material.

13. A blade re-baking machine, characterized in that: include: The fuselage (10) is provided with a moisture recovery zone inside; and The filter screen cleaning system according to any one of claims 1 to 12 is installed on the fuselage (10), wherein the filter screen (11) is arranged in the return air channel of the moisture return zone.

14. The blade re-baking machine according to claim 13, characterized in that: The filter screen cleaning system comprises a mounting seat (25) integrally provided with the filter screen (11), and the cleaning device is mounted on the mounting seat (25); The fuselage (10) is provided with a mounting opening (101), and a flange (102) is provided at the bottom of the mounting opening (101). The mounting seat (25) is placed in the mounting opening (101) and supported by the flange (102). The filter screen cleaning system includes a pressing plate (27). The pressing plate (27) and the fuselage (10) are detachably connected via a threaded connection. When connected to the fuselage (10), the pressing plate (27) presses the edge of the mounting seat (25) against the flange (102) to fix the mounting seat (25) to the fuselage (10).

15. A filter screen cleaning method based on the filter screen cleaning system according to any one of claims 1 to 12, characterized in that: include: If the pressure difference ΔP between the air inlet side and the air outlet side of the filter screen (11) is greater than or equal to a first set threshold, compressed air and / or steam is sprayed toward the air inlet side of the filter screen (11) through the cleaning device.

16. The filter screen cleaning method according to claim 15, characterized in that: The cleaning device comprises a cleaning mechanism, wherein the cleaning mechanism is configured to clean the surface of the air inlet side of the filter screen (11) so as to cause tobacco leaves attached to the filter screen (11) to fall off; The cleaning method comprises: after the cleaning device sprays compressed air and / or steam onto the air inlet side of the filter screen (11) for a preset time, the cleaning mechanism cleans the surface of the air inlet side of the filter screen (11) until the pressure difference ΔP is less than or equal to a second set threshold value or the operating time of the compressed air spraying mechanism and / or the steam spraying mechanism reaches a third set threshold value.

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