Tobacco dust collector and dust bag back-blowing dust cleaning method

Abstract

The invention discloses a tobacco dust collector and a dust bag back-blowing dust cleaning method, which is composed of a total air inlet, a front-stage conveying pipeline, a rotary feeder, a fan, a rear-stage conveying pipeline and a cylindrical dust collector connected in sequence along the material conveying direction; the rotary feeder includes an air inlet, a motor, a cylindrical rotary screen, an air outlet and a coarse material drop-out port, and the rotary feeder is a closed structure as a whole, and a plurality of evenly distributed dust-isolating baffles driven by a motor are arranged inside; the inlet at the top of the cylindrical dust collector is connected to the outlet of the fan, and an air outlet connection port is arranged horizontally in the middle, and a dust bag is arranged along the inner wall of the cylinder, and the air outlet connection port is located at a convex structure outside the dust bag; the dust bag is composed of a plurality of dust bag support frames distributed along concentric circles in layers along the height direction of the cylinder, and a dust bag set on the dust bag support frame; the lower end of the cylinder of the cylindrical dust collector is connected to the fine material drop-out port. The invention has the characteristics of high processing efficiency, good processing effect, and easy use and maintenance.

Description

Technical Field

[0001] The invention relates to the field of tobacco processing, and in particular to a tobacco dust collector and a dust bag back-blowing dust cleaning method. Background Art

[0002] The current tobacco dust collector is a square structure, and its working method is that smoke, powder, debris, broken silk, etc. enter from the rear top of the dust collector and are filtered through the dust bag. The existing dust collector has the following shortcomings when used:

[0003] (1) Too much ash is fed in, especially in mass production. A lot of smoke, powder, debris and broken silk enter the dust collector. The material outlet close to the bottom of the dust collector may be blocked, and even production may be interrupted due to blockage.

[0004] (2) The current square structure of the dust collector has dust bags arranged in the same direction, resulting in uneven working strength of the dust bags on the top, bottom, left and right sides. The dust bags located in the top area are prone to excessive dust and debris, resulting in blockage, reduced service life, and poor permeability.

[0005] (3) Currently, dust removal bags are rectangular in structure, with the same width at the head and tail. Slight deformation may cause difficulty in installation or insufficient sealing during installation, resulting in the risk of dust leakage. Summary of the invention

[0006] The purpose of the present invention is to overcome the above-mentioned shortcomings and provide a tobacco dust collector and a dust bag back-blowing dust cleaning method. The present invention can solve the following problems:

[0007] (1) The designed "air-through fine-mesh" rotary dropper can first screen out relatively large-volume debris, debris, broken silk, and some smoke and dust. Processing large particles first can reduce the smoke and dust pressure of the latter half of the equipment, which helps the dust removal bag to improve the dust removal effect;

[0008] (2) Through the designed cylindrical dust collector, the impurity gas with powder from which large particles have been removed is evenly transported from the top, so that each dust bag can evenly treat the dust, thereby avoiding the situation of uneven treatment pressure, which is conducive to improving the treatment efficiency and the treatment effect;

[0009] (3) The designed dust bag and dust bag support frame are easy to disassemble and assemble, which can avoid the risk of dust leakage caused by the dust bag being difficult to install due to slight deformation or not being installed tightly enough.

[0010] The technical solution of the present invention is:

[0011] A tobacco dust collector, which is composed of a main air inlet, a front conveying pipeline, a rotary material dropper, a fan, a rear conveying pipeline and a cylindrical dust collector which are sequentially connected along the material conveying direction;

[0012] The rotary material dropper includes an air inlet, a motor, a cylindrical rotary screen, an air outlet and a coarse material drop-out port. The rotary material dropper is an overall closed structure, and is internally provided with a plurality of evenly distributed dust-blocking baffles driven by a motor. The air inlet end and the air outlet end are arranged horizontally, and the air inlet end is connected to the air inlet, and the air outlet end is connected to the air outlet. The lower end of the closed structure is connected to the coarse material drop-out port.

[0013] The inlet of the fan is connected to the air outlet through the front section conveying pipeline, and the outlet is connected to the cylindrical dust collector through the rear section conveying pipeline;

[0014] The cylindrical dust collector is a vertical cylinder composed of a relatively closed inner cylinder and an outer cylinder, the tops of the inner cylinder and the outer cylinder are on the same plane, and a sandwich for filling filtered air is formed between the inner cylinder and the outer cylinder, the inlet located at the top of the inner cylinder is connected to the outlet of the fan, and an air outlet connection port connected to the deodorization system is horizontally arranged in the middle of the outer cylinder, and a dust bag pointing to the center of the vertical cylinder is horizontally arranged through the inner wall of the inner cylinder, the filtering section of the dust bag is located inside the inner cylinder, and the filtered air outlet is located in the sandwich; the air outlet connection port is located at the raised structures on both sides of the vertical cylinder; the dust bag is composed of a plurality of dust bag support frames uniformly distributed along concentric circles in layers along the height direction of the cylinder, and a dust bag mounted on the dust bag support frame; the lower end of the inner cylinder of the cylindrical dust collector is connected to a funnel-shaped structure, and the bottom of the funnel is connected to a fine material dropper.

[0015] Furthermore, the rotary dropper is a "air-through dropper fine mesh type" rotary dropper, and the clockwise rotation of the dust screening baffle can drive air containing debris, impurities, broken threads and / or some smoke into the rotary dropper. A fine-mesh cylindrical rotary screen is connected to the air inlet of the dropper, and the upper half of the cylindrical rotary screen is the part containing holes, and the lower half is the dropper part.

[0016] Furthermore, the rotary blanking device is driven by a motor to rapidly rotate eight dust-isolating baffles clockwise;

[0017] The inlet of the cylindrical rotating screen is open, and debris can enter directly. The upper half has a mesh with an aperture of 2 mm, and debris cannot pass through, but air can pass through; the lower half is closed and has no mesh, so as to avoid air cross-talk and ensure that debris can fall normally.

[0018] Furthermore, the dust bag support frame is in a frustum shape.

[0019] Furthermore, the dust bag support frame is in the shape of a quadrangular pyramid or a circular pyramid.

[0020] Furthermore, the outer diameter of the cylindrical dust collector is 5 meters and the inner diameter is 3.6 meters. The clean gas filtered between the inner and outer circles passes through the openings on both sides of the circular hole and enters the odor removal process under the action of the negative pressure fan.

[0021] Furthermore, four layers of dust bags are arranged inside the cylindrical dust collector along its height direction, and there are 60 dust bags distributed in a ring shape in each layer; the length of the dust bag is 1.2 meters and the width is 0.6 meters.

[0022] Furthermore, the sides of the cylindrical dust collector are all arc-shaped inspection doors from top to bottom for inspecting and disassembling dust bags; and an inspection port is provided at the top for observing the internal conditions.

[0023] Furthermore, a handle for removing the dust bag is provided at the tail of the dust removal bag, and the handle is made of polyester needle felt.

[0024] Furthermore, it also includes a backblowing device, which includes an air storage tank, a solenoid valve, a pulse blowing pipeline composed of several rubber connecting pipes and a controller. The controller can control the blowing time interval of each rubber connecting pipe by controlling the solenoid valve, and 10 pulse blowing pipelines; the dust bag is connected to the backblowing pipe of the backblowing device through the cylindrical wall of the cylindrical dust collector, which is used to remove dust adsorbed on the surface of the dust bag by backblowing to maintain the permeability of the air.

[0025] The present invention also provides a dust removal bag back-blowing dust removal method, comprising:

[0026] (1) The air tank contains 6-6.5 bar of compressed air;

[0027] (2) The pulse interval time of the reverse blowing is controlled by the controller to control the solenoid valve, and the pulse interval time is adjusted in combination with the set frequency of the fan 4, including:

[0028] When the set frequency is ≤30Hz, the interval between each pulse is 7 seconds; when 30Hz<set frequency≤50Hz, the interval between each pulse=[(7 seconds-4 seconds)*(50Hz-fan 4 frequency) / (50Hz-30Hz)+4 seconds)];

[0029] (3) Multiple pulse jet pipes are connected in a clockwise direction, that is, the first pipe corresponds to the dust bag in the zero direction, the second pipe corresponds to the second dust bag in the clockwise direction... After the ten pipe cycles are completed, the first pipe corresponds to the eleventh dust bag in the clockwise direction, and so on. The dust bags in the upper and lower layers in the same direction correspond to the same pulse jet pipe.

[0030] (4) To avoid mutual influence of airflows between different dust bags when the spray pipes are sprayed simultaneously, the controller performs reverse spraying of the dust bags 53 in the form of spraying No. 1 / 6 for the first time, spraying No. 2 / 7 for the second time, spraying No. 3 / 8 for the third time, spraying No. 4 / 9 for the fourth time, and spraying No. 5 / 10 for the fifth time.

[0031] The working principle of the cylindrical dust collector of the present invention:

[0032] The main structure is divided into an inner cylinder and an outer cylinder. The only airflow channel between the inner cylinder and the outer cylinder is the 240 dust bags installed in the dust collector. The dust removal gas with dust and debris enters the inner cylinder from the circular airflow inlet at the top of the inner cylinder. Under the action of gravity and wind speed, the dust and debris are evenly filled in the inner cylinder, and the dust and debris slowly fall to the fine material dropper, where the dust is gathered and separated, and enters the subsequent pressing link of the pressing machine under the action of negative pressure.

[0033] The dust removal gas enters from the circular air flow inlet at the top of the inner cylinder, and under the action of the negative pressure behind the air outlet connection ports on both sides of the outer cylinder, it is filtered by the dust removal bags around the cylinder and enters the annular dust-free area between the inner cylinder and the outer cylinder. Under the negative pressure of the fan in the subsequent odor removal process, it enters the subsequent process through the air outlet connection ports on both sides.

[0034] The tops of the inner and outer cylinders are on the same plane, and the tops are sealed annular stainless steel; the bottom of the inner cylinder is connected to the fine material feeder, and the outer cylinder is separated from the bottom conical feed bin by an annular stainless steel barrier to prevent the gas that has not been purified by the dust bag from entering the subsequent process.

[0035] Beneficial effects of the present invention:

[0036] 1. Through the designed "air-through fine mesh" rotary blanking device, relatively large-volume debris, debris, broken silk, and part of the smoke and dust are screened out. Large particles are processed first to reduce the additional smoke and dust pressure of the second half of the equipment, which helps the dust removal bag to improve the dust removal effect. The cylindrical air-through blanking design with ventilation on the upper part and closed on the lower part can well ensure the continuity of negative pressure, and can process a large amount of large-volume debris in advance, greatly reducing the subsequent dust treatment pressure, improving the treatment effect, and then reducing the odor molecules discharged into the atmosphere, contributing to environmental protection;

[0037] 2. Through the designed cylindrical dust collector, the impurity air with powder is evenly delivered from the top, so that each dust bag can evenly handle the dust, thus avoiding the situation of uneven processing pressure, which is conducive to improving the processing efficiency and the processing effect;

[0038] 3. The designed dust bag and dust bag support frame can be easily disassembled and assembled, avoiding the risk of dust leakage caused by slight deformation of the dust bag, which makes it difficult to install or is not installed tightly enough. BRIEF DESCRIPTION OF THE DRAWINGS

[0039] Figure 1 : The overall structural schematic diagram of the tobacco dust collector of the present invention.

[0040] Figure 2 : Schematic diagram of the structure of the rotary feeder.

[0041] Figure 3 : Schematic diagram of the structure of the cylindrical dust collector.

[0042] Figure 4 : Cross-sectional view of a dust bag.

[0043] Figure 5 : Schematic diagram of a tetrahedral pyramid support frame.

[0044] In the figure:

[0045] 1-Main air inlet;

[0046] 21-front section delivery pipeline, 22-rear section delivery pipeline;

[0047] 3-rotating feeder, 31-air inlet, 32-motor, 33-cylindrical rotary screen, 34-air outlet, 35-coarse material feed port, 36-ash baffle;

[0048] 4- fan;

[0049] 5-cylindrical dust collector, 51-dust bag, 52-dust bag support frame, 53-dust bag, 54-raised structure, 55-air outlet connection port, 56-fine material dropper. DETAILED DESCRIPTION

[0050] As shown in 1, a tobacco dust collector is composed of a main air inlet 1, a front conveying pipeline 21, a rotary material dropper 3, a fan 4, a rear conveying pipeline 22 and a cylindrical dust collector 5 in sequence along the material conveying direction.

[0051] like Figure 2 As shown, the rotary blanking device 3 includes an air inlet 31, a motor 32, a cylindrical rotary screen 33, a discharge port 34 and a coarse material discharge port 35. The rotary blanking fan 32 is a closed structure, and its air inlet end and air outlet end are horizontally arranged, its air inlet end is connected to the air inlet 31, and the air outlet end is connected to the air outlet 34, and the lower end of the closed structure is connected to the coarse material discharge port 35; the inlet of the fan 4 is connected to the air outlet 34 through the front section conveying pipe 21, and its outlet is connected to the cylindrical dust collector 5 through the rear section conveying pipe 22.

[0052] like Figure 3 As shown, the cylindrical dust collector 5 is a vertical cylinder composed of a relatively closed inner cylinder and an outer cylinder. The tops of the inner cylinder and the outer cylinder are on the same plane. A sandwich layer for filling filtered air is formed between the inner cylinder and the outer cylinder. The inlet at the top of the inner cylinder is connected to the outlet of the fan 4. The middle of the outer cylinder is horizontally provided with an air outlet connection port 55 connected to the deodorization system. The inner cylinder is horizontally provided with a dust bag 51 pointing to the center of the vertical cylinder through its inner wall. The filtering section of the dust bag 51 is located inside the inner cylinder, and the filtered air outlet is located in the interlayer; the air outlet connection port 55 is located at the raised structure 54 on both sides of the vertical cylinder; the dust bag 51 is composed of a plurality of dust bag support frames 52 uniformly distributed along concentric circles in layers along the height direction of the cylinder, and a dust bag 53 mounted on the dust bag support frames 52; the lower end of the inner cylinder of the cylindrical dust collector 5 is connected to a funnel-shaped structure, and the bottom of the funnel is connected to a fine material dropper 56.

[0053] like Figure 4 As shown, the dust bag support frame 52 is in a frustum shape.

[0054] like Figure 4 , Figure 5 As shown, the dust bag 51 is composed of a plurality of dust bag support frames 52 distributed along concentric circles in layers and a dust bag 53 mounted on the dust bag support frames 52 .

[0055] The dust bag 53 is connected to a back-blowing pipe of a back-blowing device through the cylindrical wall of the cylindrical dust collector 5, which is used to remove dust adsorbed on the surface of the dust bag 53 by back-blowing to maintain air permeability; the back-blowing device adopts a product of existing technology, which includes an air storage tank, a diaphragm valve, a solenoid valve, a rubber connecting pipe, a controller, a diaphragm valve and a steam-water separator, and several rubber connecting pipes are provided, and the controller can control the blowing time interval and blowing duration of a single rubber connecting pipe.

[0056] The rotary dropper 3 is a "air-through drop fine mesh" rotary dropper. Smoke, dust, debris, broken silk, and the like enter the dust removal duct and first enter the rotary dropper 3 under the rotation drive of the motor 32. The connection of the dropper is a fine-mesh cylindrical stainless steel metal net with a mesh diameter of 2 mm. The upper half of the cylindrical rotary screen 33 contains holes, which can keep the air duct unobstructed and prevent the soft connection from being damaged due to excessive negative pressure. The lower half is the drop part, and relatively large volumes of debris, broken silk, and part of the smoke fall under the action of gravity and enter the subsequent pressing process for processing. The remaining smoke foam enters the cylindrical dust collector 5 along with the negative pressure wind under the action of the fan 4. The inner wall of the cylindrical dust collector 5 is a dust bag 51. Under the dual effects of vertical drop and negative pressure outside the dust collector, the smoke foam gradually falls downward along the dust bag 51. The extremely fine odorous gas particles pass through the dust bag 51 and enter the subsequent odor treatment process, while the smoke foam cannot pass through and falls evenly between the dust bags 51, enters the fine material dropper 56 below, and then enters the beating machine for treatment.

[0057] like Figure 2 As shown, the rotary dropper 3 is driven by a motor 32 to rotate eight dust baffles 36 clockwise rapidly. The upper half of the cylindrical rotating screen 33 is represented by a dotted line with mesh holes, which is a stainless steel metal mesh with a mesh diameter of 2mm; when the dust baffle 36 rotates rapidly, the gas can still pass through a part of the upper semicircular gap of the cylindrical rotating screen 33, thereby maintaining the continuity of the negative pressure, and the negative pressure drives the forward movement, without the risk of blocking the material to avoid the rapid wear of the soft connection, and the smoke, dust, debris, broken silk, etc. mixed between the adjacent dust baffles 36 fall by gravity and are transported through the pipeline into the rod pressing machine for rod pressing. The entrance of the cylindrical rotating screen 33 is open, and debris can enter directly. The unfilled part of the upper half has a 2mm mesh, and debris cannot pass through, but airflow can pass through; the lower half is closed and has no mesh, thereby avoiding cross-flow and ensuring that debris can fall normally.

[0058] like Figure 3 As shown, the unprocessed smoke foam in the rotary feeder 3 of the air-dropping fine mesh type enters the cylindrical dust collector 5 with the negative pressure wind under the action of the fan 4. The inner circle of the cylindrical dust collector 5 is a dust bag 51. The smoke foam gradually falls down along the dust bag 51 under the dual action of vertical drop and the negative pressure outside the dust collector. The extremely fine odorous gas particles pass through the dust bag 51 and enter the subsequent odor treatment process, while the smoke foam cannot pass through and falls evenly between the dust bags 51, enters the fine material feeder 56 below, and then enters the rod beating machine for treatment. The outer shell of the cylindrical dust collector 5 is made of structural steel sheet material, so that it can withstand the negative pressure operation of 600 mm water column, and it can be reinforced for lower negative pressure conditions.

[0059] like Figure 4 As shown, the total diameter of the cylindrical dust collector 5 is 5 meters (outer circle), and the inner diameter is 3.6 meters (inner circle). The space between the inner and outer circles is the filtered clean gas, which enters the odor removal process under the action of the negative pressure fan through the openings on both sides of the circular hole. In addition to the openings on both sides, the sides of the cylindrical dust collector 5 are all arc-shaped inspection doors from top to bottom for inspecting and disassembling the dust bags. In addition, there is also an inspection port at the top for observing the internal situation. The dust bags 51 are all installed on the inner cylinder. The dust bags 51 are 1.2 meters long and 0.6 meters wide. They are mounted on a four-sided pyramid-shaped structure (such as Figure 5 On the dust bag support frame 52 shown).

[0060] A single dust bag 51 is composed of a dust bag support frame 52 (made of stainless steel) and a dust bag 53. The opening height of the dust bag 53 is 60 cm, the port is 50 cm, and the length is 120 cm. The dust bag 51, which is in the shape of a quadrangular pyramid as a whole, can ensure that the air intake pressure at the tail is not significantly lower than that at the head, thereby avoiding the accumulation of tobacco dust at the tail due to insufficient pulse air pressure. The coordination of the dust bag support frame 52 and the dust bag 53 facilitates disassembly and assembly, avoiding the risk of dust leakage caused by the dust bag being difficult to install or not being installed tightly enough due to slight deformation. At the same time, it can ensure that the air intake pressure at the tail is not significantly lower than that at the head, thereby avoiding the accumulation of tobacco dust at the tail due to insufficient pulse air pressure.

[0061] The dust bag 53 is made of polyester needle felt, which is made of polyester fiber through a needle punching process. The surface of the needle felt can be smooth and lint-free after a hot surface treatment. Polyester needle felt uses staggered and evenly distributed fine short fibers to filter air, with a porosity of 70%, which is twice that of a woven filter cloth. The dust removal efficiency is high and the gas emission concentration is low. The surface of the polyester needle felt is hot-rolled and singed or coated, flat and smooth, not easy to clog, not deformed, easy to clean, and has a long service life. A "bag removal handle" is added to the tail of the dust bag 53 to facilitate the separation of the dust bag and the support frame during cleaning, thereby reducing labor intensity.

[0062] The dust bag 51 solves the problem of uneven air pressure in traditional dust bags, especially the air pressure at the tail is enhanced to avoid tobacco powder accumulation. Its frustum-shaped shape is easy to disassemble and avoid the risk of dust leakage caused by the dust bag being difficult to install or not being airtight when slightly deformed.

[0063] like Figure 4 As shown, the dust-laden gas enters the cylindrical dust collector 5 and passes through the dust bag 51, so that the dust is adsorbed on the outer surface of the dust bag 51, thus forming a dust layer on the outer surface, while the clean air passes through the filter medium of the dust bag 51 into the dust-free area and is discharged into the odor removal system through the action of the fan 4.

[0064] The back-blowing and dust cleaning of the dust bag 51 is controlled by the controller of the back-blowing device. After a certain time interval, each dust bag 51 receives a short burst of compressed air released by the blowing pipe in turn, generating a short and strong back-blowing airflow blowing toward the dust bag 51, causing the dust bag 51 to expand and bend outward, so that the dust layer is effectively removed and falls into the fine material dropper 56 located below the funnel. Through such operation, the total pressure drop after dust removal can be maintained at a relatively stable level, so that the dust collector can operate continuously for 24 hours.

[0065] The present invention also provides a method for removing surface dust by back-blowing a dust removal bag of a cylindrical dust collector, comprising the following steps:

[0066] 1. The air tank contains 6-6.5 bar compressed air to ensure that there is enough compressed air and force to blow off the smoke and dust adsorbed on the surface of the dust bag during reverse blowing.

[0067] 2. The pulse interval time of reverse blowing is controlled by the controller through the solenoid valve.

[0068] 3. The controller performs pulse operation through the PLC input action signal, and adjusts the pulse time in combination with the fan frequency (set frequency). When the fan frequency is ≤30Hz, the interval between each pulse is 7 seconds; when 30Hz<fan frequency≤50Hz, the interval between each pulse = [(7 seconds-4 seconds)*(50Hz-fan frequency) / (50Hz-30Hz)+4 seconds)]; the pulse time retains one decimal place.

[0069] 4. The 10 pulse jet pipes are connected in a clockwise direction, that is, the first pipe corresponds to the dust bag in the zero direction, the second pipe corresponds to the second dust bag clockwise.... After the ten pipe cycles are completed, the first pipe corresponds to the eleventh dust bag clockwise, and so on. The dust bags in the upper and lower layers in the same direction correspond to the same pulse jet pipe.

[0070] 5. To avoid mutual influence of airflows between different dust bags when the spray pipes are sprayed at the same time, the controller performs reverse spraying of the dust bags in the form of spraying No. 1 / 6 spray pipes for the first time, spraying No. 2 / 7 spray pipes for the second time, spraying No. 3 / 8 spray pipes for the third time, spraying No. 4 / 9 spray pipes for the fourth time, and spraying No. 5 / 10 spray pipes for the fifth time.

[0071] In the present invention, four layers of dust bags are arranged inside the cylindrical dust collector along its height direction. There are 60 dust bags distributed in a ring in each layer, totaling 240. This number design can meet the dust removal air volume required by different process sections in the tobacco silk making and wrapping process. A group of 240 dust bags inside the dust collector can completely handle an air volume of 30,000 m 3 / h, which fully meets the dust removal air volume required by different process sections in the tobacco silk making and packaging process.

[0072] Analysis of the difference in dust removal effect between the dust removal bag of the present invention and the traditional rectangular dust removal bag after installation in the cylinder from the center to the circumference of the cylinder:

[0073] In a traditional rectangular dust collector, the airflow carries soot and debris horizontally through the long strip gap at the upper rear of the dust collector. Due to the small gap between the dust bags and the short distance between the tail end of the dust bag and the wall of the dust collector, the airflow and soot cannot be evenly separated and screened from the dust bags, resulting in the top dust bag, especially the middle part, having an excessively heavy processing load, while the processing load on the two sides of the lower end is low, making it impossible for the dust bags to evenly perform their processing functions. In addition, dust and foreign matter can easily clog the gaps between the dust bags in the middle part of the top, resulting in poor dust removal effect.

[0074] The tail of each dust bag of the present invention forms a cylinder, and the airflow during the dust removal process carries soot and debris downward from the large circular cake-shaped conveying port at the top. The conveying port is more than 5 times larger than the area of ​​the long strip, thereby reducing the airflow velocity, and the airflow can be evenly filled in the entire dust collector through the cylindrical cavity formed at the tail end of the dust bag, so that after the dust bag is installed in the cylinder, the dust removal effect from the center to the circumference of the cylinder is uniform, and there will be no phenomenon of excessive or insufficient processing load in some areas. Since the airflow is evenly and stably filled, the dust bag can stably and evenly perform filtering, and the dust removal effect is significantly improved compared with traditional square dust bags and rectangular dust collectors.

[0075] The words expressing position and direction described in this application are all explained by taking the drawings as examples, but they can be changed as needed, and the changes are included in the protection scope of this application. The drawings of this application are only used to illustrate the relative position relationship and do not represent the actual proportion.

Claims

1. A tobacco dust collector, characterized in that: It is composed of a main air inlet (1), a front conveying pipeline (21), a rotary material dropper (3), a fan (4), a rear conveying pipeline (22) and a cylindrical dust collector (5) which are sequentially connected along the material conveying direction; The rotary material dropper (3) comprises an air inlet (31), a motor (32), a cylindrical rotary screen (33), an air outlet (34) and a coarse material drop port (35); the rotary material dropper (3) is an overall closed structure, and is internally provided with a plurality of evenly distributed dust-blocking baffles (36) driven by the motor (32); an air inlet end and an air outlet end thereof are arranged horizontally, the air inlet end is connected to the air inlet (31), and the air outlet end is connected to the air outlet (34); and the lower end of the closed structure is connected to the coarse material drop port (35); The inlet of the fan (4) is connected to the air outlet (34) through the front section conveying pipeline (21), and the outlet is connected to the cylindrical dust collector (5) through the rear section conveying pipeline (22); The cylindrical dust collector (5) is a vertical cylinder composed of a relatively closed inner cylinder and an outer cylinder. The tops of the inner cylinder and the outer cylinder are on the same plane. A layer for filling filtered air is formed between the inner cylinder and the outer cylinder. The inlet at the top of the inner cylinder is connected to the outlet of the fan (4). The middle of the outer cylinder is horizontally provided with an air outlet connection port (55) connected to the deodorization system. The inner cylinder is horizontally provided with a dust bag (51) pointing to the center of the vertical cylinder through its inner wall. The dust bag (51) The filter section is located inside the inner cylinder, and the filter air outlet is located in the interlayer; the air outlet connection port (55) is located at the protruding structures (54) on both sides of the vertical cylinder; the dust bag (51) is composed of a plurality of dust bag support frames (52) uniformly distributed along concentric circles in layers along the height direction of the cylinder, and a dust bag (53) sleeved on the dust bag support frames (52); the lower end of the inner cylinder of the cylindrical dust collector (5) is connected to a funnel-shaped structure, and the bottom of the funnel is connected to a fine material dropper (56); A fine-mesh cylindrical rotary screen (33) is connected behind the air inlet (31) of the rotary material dropper (3); the upper half of the cylindrical rotary screen (33) is a portion containing holes, and the lower half is a material drop portion, and the lower half has no mesh holes; the dust bag support frame (52) is in the shape of a cone.

2. The tobacco dust collector according to claim 1, characterized in that: The rotary material dropper (3) can drive air containing dust, debris, shreds and / or part of the smoke into the rotary material dropper (3) through the clockwise rotation of the dust isolation baffle (36).

3. The tobacco dust collector according to claim 2, characterized in that: The rotary blanking device (3) is driven by a motor (32) to rapidly rotate eight dust-blocking baffles (36) in a clockwise direction; The inlet of the cylindrical rotating mesh screen (33) is open, and mesh holes with a pore size of 2 mm are evenly arranged in the upper half.

4. The tobacco dust collector according to claim 3, characterized in that: The dust bag support frame (52) is in the shape of a quadrangular pyramid or a circular pyramid.

5. The tobacco dust collector according to claim 1, characterized in that: The cylindrical dust collector (5) has an outer diameter of 5 meters and an inner diameter of 3.6 meters. The clean gas filtered between the inner and outer circles enters the deodorization process through the openings on both sides of the circular hole; The cylindrical dust collector (5) is provided with four layers of dust removal bags (51) in its height direction, and each layer has a total of 60 dust removal bags (51) distributed in a ring shape; The dust removal bag (51) has a length of 1.2 meters and a width of 0.6 meters.

6. The tobacco dust collector according to claim 1, characterized in that: The cylindrical dust collector (5) has arc-shaped inspection doors on its sides from top to bottom for inspecting and disassembling the dust bag; and an inspection port is provided at its top for observing the internal conditions.

7. The tobacco dust collector according to claim 1, characterized in that: The tail of the dust removal bag (53) is provided with a handle for removing the bag; The dust removal bag (53) is made of polyester needle felt.

8. The tobacco dust collector according to any one of claims 1 to 7, characterized in that: It also includes a back-blowing device, which includes an air storage tank, a solenoid valve, a pulse blowing pipeline composed of several rubber connecting pipes, and a controller. The controller can control the blowing time interval of each rubber connecting pipe by controlling the solenoid valve, and 10 pulse blowing pipelines; the dust bag (53) is connected to the back-blowing pipe of the back-blowing device through the cylindrical wall of the cylindrical dust collector (5), which is used to remove dust adsorbed on the surface of the dust bag (53) by back-blowing to maintain air permeability.

9. The dust removal method for dust removal bag of tobacco dust collector according to claim 8, characterized in that: The following steps are involved: (1) The air tank contains 6-6.5 bar of compressed air; (2) The pulse interval time of the reverse blowing is controlled by the controller to control the solenoid valve, and the pulse interval time is adjusted in combination with the set frequency of the fan (4), including: When the set frequency is ≤30Hz, the interval between each pulse is 7 seconds; When 30Hz<set fan frequency≤50Hz, the interval between each pulse = 3 seconds × (50Hz-set fan frequency) ÷ 20Hz + 4 seconds; (3) Multiple pulse jet pipes are connected in a clockwise direction, that is, the first pipe corresponds to the dust bag in the zero direction, the second pipe corresponds to the second dust bag in the clockwise direction... After the ten pipe cycles are completed, the first pipe corresponds to the eleventh dust bag in the clockwise direction, and so on. The dust bags in the upper and lower layers in the same direction correspond to the same pulse jet pipe; (4) The controller performs reverse blowing of the dust bag (53) in the form of first blowing of No. 1 and No. 6 blowing pipes, second blowing of No. 2 and No. 7 blowing pipes, third blowing of No. 3 and No. 8 blowing pipes, fourth blowing of No. 4 and No. 9 blowing pipes, and fifth blowing of No. 5 and No. 10 blowing pipes, so as to avoid the airflows between different dust bags from adversely affecting each other when the blowing pipes are blown simultaneously.

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