A cut tobacco air-borne separator feed device and method which improves the efficiency of the air-borne separation
By integrating the material pretreatment unit and the air separation feeding unit into the leaf shred air separator, and by using screening and airflow velocity differentiation to process materials, the problem of low air separation efficiency of the leaf shred air separator is solved, and efficient stem removal and tobacco shred protection are achieved.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Patents(China)
- Current Assignee / Owner
- CHINA TOBACCO ZHEJIANG IND CO LTD
- Filing Date
- 2024-09-30
- Publication Date
- 2026-05-19
AI Technical Summary
Existing leaf shred air separators suffer from low air separation efficiency and high tobacco shred loss when removing stems and twigs. Furthermore, the secondary air separation equipment requires significant space and is costly to install, making it difficult to meet the needs of high-end products.
Based on the leaf-filament air classifier, an incoming material pretreatment unit and an air classification feeding unit are integrated. By screening and differentiating materials by airflow velocity, the separation of materials of large and small size is achieved, the material-to-air ratio is reduced, and the air separation efficiency is improved.
It significantly improves the air separation efficiency of the leaf shred air classifier, reduces tobacco shred loss, lowers raw material costs, avoids the purchase and operating costs of additional equipment, and does not occupy additional space.
Smart Images
Figure CN119387154B_ABST
Abstract
Description
Technical Field
[0001] This invention belongs to the field of tobacco processing and production technology, specifically relating to a feeding device and method for a leaf filament air separator that can improve air separation efficiency. Background Technology
[0002] The air separation and impurity removal process is a crucial step in tobacco processing. Its main purpose is to control the amount of tobacco fibers in the removal strips while removing the stems and stalks that have been cut from the tobacco leaves. A high stem and stalk content significantly impacts the weight of the finished cigarette, the uniformity of tobacco distribution and density within each cigarette, and consequently, the cigarette's hardness, tar content, draw resistance, sensory quality, tobacco consumption, and the operating efficiency of the cigarette-making machine. It can also easily lead to defects in cigarettes, especially slim and medium-sized cigarettes, such as punctures in the cigarette paper and burner tipping, resulting in quality defects. Furthermore, the qualified tobacco fibers remaining in the removal strips are discarded, affecting the cost of raw materials for cigarettes.
[0003] Currently, most cigarette manufacturers use leaf air separators as processing equipment after the leaf drying stage. These separators utilize the difference in suspension velocity between tobacco shreds and stems to remove stems from the tobacco. Although the feeding device of the leaf air separator is equipped with a high-speed conveyor belt for throwing and spreading the material, the entanglement and clumping of some tobacco shreds affect the stability of the gas flow field and the setting of the gas velocity in the air separation area. Furthermore, the large flow rate of the production line and the overlapping of tobacco shreds and stems, along with the diversity of tobacco shred shapes, cause some stems to be lifted by clumps of tobacco, making separation impossible. This introduces a certain degree of probability into the air separation process. Increasing the amount of stems removed results in tobacco shreds being discharged with the stems, increasing tobacco loss. Therefore, leaf air separators can only remove a certain amount of stems and cannot meet the needs of higher-grade products. To address this situation, many companies in the industry use leaf-based air classifiers as the basic equipment and connect them in parallel with secondary air classifiers. This allows for the secondary air classifier to further separate and recover the tobacco shreds discharged with the stems, while increasing the amount of stems removed by the leaf-based air classifier. During this secondary air classifier process, the material is loosened, relatively freed, and has a larger air classifier surface. This allows for a smaller material-to-air ratio and a lower suspension velocity, resulting in a stem removal rate that is more than five times higher than that of current leaf-based air classifiers, significantly improving the processing efficiency. However, some cigarette manufacturers' production lines do not have the space requirements to accommodate the secondary air separation equipment, resulting in a shortage of processing capacity. Furthermore, under certain rejection conditions, the procurement investment and operating energy consumption costs of the secondary air separation equipment are relatively high. At the same time, based on the actual operation of the leaf shred air separator using the secondary air separation process, it was found that even with a reduction in the air volume and an increase in the rejection rate of the leaf shred air separator, since the amount of material entering the secondary air separation equipment is only about 10%, the remaining material volume is still relatively large. A small amount of stems will still pass through the air separation area of the leaf shred air separator and enter the downstream equipment. Therefore, there is still room for further improvement in the air separation efficiency of the leaf shred air separator. Summary of the Invention
[0004] To address the aforementioned technical problems in the existing technology, this invention provides a feeding device and method for a leaf filament air classifier that can improve air separation efficiency. This invention is highly integrated with existing leaf filament air classifiers, does not occupy additional space, is easy to implement, adopts mature technology, operates stably, requires little maintenance, and greatly improves the operating efficiency and process quality assurance capability of the leaf filament air classifier equipment, thus having strong applicability.
[0005] The technical solution adopted in this invention is:
[0006] A feeding device for a leaf filament air classifier that can improve air separation efficiency is characterized by comprising an incoming material pretreatment unit (1), an air separation feeding unit (2), and a support (6). The air separation feeding unit (2) and the support (6) are respectively fixed on the side plate (5) of the conveying component of the leaf filament air classifier. The incoming material pretreatment unit (1) is fixed on the support (6). The air separation feeding unit (2) is connected to the middle box (3) of the leaf filament air classifier.
[0007] The incoming material pretreatment unit (1) includes a transmission trough (1-1), a high-frequency vibration motor (1-2), a support spring (1-3), a screening bar (1-4), and a feeding hopper (1-5). The high-frequency vibration motor (1-2) is located at the bottom of the transmission trough (1-1), and the transmission trough (1-1) is inclinedly mounted on a support (6) via the support spring (1-3). The upper end of the support spring (1-3) is installed at the bottom of the transmission trough (1-1), and the other end is installed at the bottom of the support spring (1-5). The top of the support (6) is provided with several screening bars (1-4) spaced apart along the length of the transmission trough (1-1), i.e., the material conveying direction; the high end of the transmission trough (1-1) is the feeding end, which is connected to the upstream feeding vibrating conveyor (7) of the leaf filament air classifier; the low end of the transmission trough (1-1) is the discharge end, which has a first discharge port and a second discharge port, and the first discharge port is connected to the hopper (1-5) for the material to fall below the screening bars;
[0008] The air-separating feeding unit (2) includes an air-separating feeding unit housing (2-2), a high-speed conveyor belt (2-4), a first partition (2-5), a closed ejector (2-6), a second partition (2-7), an air pressure plate cavity (2-9), and an air pressure plate (2-10). The air-separating feeding unit housing (2-2) is respectively provided with the high-speed conveyor belt (2-4) and the closed ejector (2-6), serving as the two feeding ends of the air-separating feeding unit (2). The second discharge port extends into the air-separating feeding unit housing (2-2) and connects to the high-speed conveyor belt (2-4). The discharge hopper (1-5) is connected to the closed ejector (2-6). An air pressure plate cavity (2-9) and an air pressure plate (2-10) are provided above the high-speed conveyor belt (2-4), and an air pressure plate (2-10) is provided below the side of the air pressure plate cavity (2-7). 10), used to adjust the amount of gas entering the leaf filament air separator through the air separator feeding unit (2-2); a first partition (2-5) and a second partition (2-7) are provided below the high-speed conveyor belt (2-4). The lower ends of the first partition (2-5) and the second partition (2-7) are respectively fixed at the bottom of the inner cavity of the air separator feeding unit box (2-2). An airflow channel is formed in the area between the first partition (2-5) and the second partition (2-7). The airflow channel is connected to the airflow channel of the leaf filament air separator discharge hopper component (4). The difference in suspension velocity is used to separate the small material and most of the stems mixed in it. The stems fall and leave the production line through the leaf filament air separator discharge hopper component (4). The leaf filaments move upward with the airflow and enter the middle box of the leaf filament air separator through the channel between the first partition (2-5) and the high-speed conveyor belt (2-4).
[0009] Furthermore, the cross-sectional dimensions of the channel between the first partition (2-5) and the high-speed conveyor belt (2-4) and the airflow channel between the first partition (2-5) and the second partition (2-7) are different, so as to obtain different airflow velocities and realize differentiated air separation treatment of materials and stems of different shapes and sizes in the blades.
[0010] Furthermore, the bracket (6) is connected to the side plate (5) of the leaf filament air separator conveying component via a bracket connecting plate (6-1).
[0011] Furthermore, the air separation feeding unit (2) is fixed to the side plate (5) of the conveying component of the leaf filament air separator via the air separation feeding unit flange (2-1), and is connected to the middle box (3) of the leaf filament air separator via the middle box flange (3-1).
[0012] Furthermore, the high-speed conveyor belt (2-4) and the enclosed feeder (2-6) correspond to different airflow velocities and air distribution methods.
[0013] Furthermore, the high-speed conveyor belt (2-4) and the enclosed feeder (2-6) can be adjusted to accommodate changes in the state of the material.
[0014] Furthermore, the high-speed conveyor belt (2-4) and the enclosed ejector (2-6) are respectively driven and connected to the first drive motor (2-3) and the second drive motor (2-8) to change the post-throwing state of the material and assist in adjusting the air separation effect.
[0015] A method for feeding blade air classifier to improve air separation efficiency, characterized in that the method specifically includes the following steps:
[0016] S1. The incoming material pretreatment unit connects to the material fed by the upstream vibrating conveyor of the conveyor blade air separator. During the conveying process, the material is screened and separated by screening bars according to the different shapes and sizes of the material and stems, and the material is loosened to a certain extent.
[0017] S2. After screening and separation, the larger materials and a small amount of stems located above the screening bar enter the high-speed conveyor belt of the air classifier feeding unit through the first outlet of the incoming material pretreatment unit. The separation of the larger materials and the small amount of stems mixed in is completed by the combination of the inertia of the materials after leaving the high-speed conveyor belt and the airflow speed in the separation position area. The stems fall and leave the production line through the waste hopper of the blade air classifier. The blades enter the inner box of the blade air classifier, settle down and fall onto the conveyor belt of the blade air classifier and are conveyed to the discharge device of the blade air classifier to enter the downstream equipment.
[0018] S3. After screening and separation, the small-sized material located below the screening bar is fully thrown into the airflow channel of the air classifier feeding unit through the closed thrower of the feeding hopper and connected to the airflow channel of the leaf filament air classifier discharge hopper component. The small-sized material is separated from most of the stems mixed in by the difference in suspension velocity. The stems fall and leave the production line through the discharge hopper component of the leaf filament air classifier. The leaf filaments move upward with the airflow and enter the inner box of the leaf filament air classifier through the channel below the high-speed conveyor belt. They settle and fall down and are collected with the leaf filaments after air classification in process B above. Then, the leaf filament air classifier is conveyed by the conveyor belt component to the discharge device of the leaf filament air classifier and enters the downstream equipment.
[0019] S4. In the above steps S2 and S3, materials that are too large or have a large shape and size can fall and enter the current blade air classifier's waste hopper component for further processing and air separation according to the existing loosening and de-agglomeration mode, thereby completing the entire feeding process of the blade air classifier's auxiliary air separation.
[0020] Furthermore, the high-speed conveyor belt (2-4) can achieve the thinning and conveying of materials with large dimensions and provide a certain air separation surface by throwing speed. The closed throwing device (2-6) can achieve the rapid throwing of materials with small dimensions, so that the materials are relatively free and dispersed and extended, while avoiding the existence of horizontal airflow, which is conducive to ensuring air separation efficiency.
[0021] Compared with the prior art, the beneficial effects of the present invention are reflected in:
[0022] 1. Based on the existing leaf filament air classifier, the present invention can complete the connection and conveying of upstream materials to the leaf filament air classifier through the incoming material pretreatment unit, and carry out corresponding loosening, screening and separation treatment during the conveying process. Then, the materials are sent to different air separation areas in different states through high-speed conveyor belts and closed feeders at different positions of the air separation feeding unit for air separation and impurity removal treatment.
[0023] 2. For materials with large dimensions, the present invention uses a combination of inertia and airflow velocity to separate the large materials from the small amount of stems mixed in them. For materials with small dimensions, after thorough scattering, the difference in suspension velocity is used to separate the small materials from most of the stems mixed in them.
[0024] 3. This invention can significantly reduce the impact of large-sized materials on air separation efficiency. It can perform differentiated air separation treatment on materials of different shapes and sizes and stems in tobacco leaves. It also realizes the diversion treatment of upstream materials and reduces the material-to-air ratio in the air separation process, thereby effectively improving the air separation efficiency of the tobacco leaf air classifier. At the same time, it can stably control the tobacco content in the removed stems to reduce the waste of raw material costs caused by discarding tobacco leaves with the stems. It can also avoid the purchase and operation costs of reuse equipment and the occupation of production line space under a certain air separation rejection requirement. Attached Figure Description
[0025] Figure 1 This is a schematic diagram of the overall structure of the device of the present invention.
[0026] Reference numerals in the attached drawings: 1. Incoming material pretreatment unit; 1-1. Conveyor trough; 1-2. High-frequency vibrating motor; 1-3. Support spring; 1-4. Screening bar; 1-5. Feed hopper; 2. Air classifier feeding unit; 2-1. Air classifier feeding unit flange; 2-2. Air classifier feeding unit housing; 2-3. First drive motor; 2-4. High-speed conveyor belt; 2-5. First partition; 2-6. Sealed feeder; 2-7. Second partition; 2-8. Second drive motor; 2-9. Air pressure plate cavity; 2-10. Air pressure plate; 3. Middle housing of the leaf-shaped air classifier; 3-1. Middle housing flange; 4. Impurity hopper component of the leaf-shaped air classifier; 5. Side plate of the conveyor component of the leaf-shaped air classifier; 5-1. Belt of the conveyor component of the leaf-shaped air classifier; 6. Support; 6-1. Support connecting plate; 7. Upstream feeding vibrating conveyor of the leaf-shaped air classifier. Detailed Implementation
[0027] The specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are for illustration and explanation only and are not intended to limit the scope of the present invention.
[0028] It should be noted that, unless otherwise specified, the embodiments and features described in the present invention can be combined with each other.
[0029] The present invention will now be described in detail with reference to the accompanying drawings and exemplary embodiments.
[0030] Example 1
[0031] refer to Figure 1 The present invention discloses a feeding device for a leaf filament air classifier that can improve air separation efficiency, comprising an incoming material pretreatment unit 1, an air separation feeding unit 2, and a support 6. The air separation feeding unit 2 and the support 6 are respectively fixed on the side plate 5 of the conveying component of the leaf filament air classifier. The incoming material pretreatment unit 1 is fixed on the support 6. The air separation feeding unit 2 is connected to the middle box 3 of the leaf filament air classifier.
[0032] The incoming material pretreatment unit 1 includes a transmission trough 1-1, a high-frequency vibration motor 1-2, a support spring 1-3, screening bars 1-4, and a discharge hopper 1-5. The high-frequency vibration motor 1-2 is located at the bottom of the transmission trough 1-1, and the transmission trough 1-1 is inclinedly mounted on a support 6 via the support spring 1-3. The upper end of the support spring 1-3 is installed at the bottom of the transmission trough 1-1, and the other end is installed at the top of the support 6. Several screening bars 1-4 are spaced apart along the length direction of the transmission trough 1-1, i.e., the material conveying direction. The high end of the transmission trough 1-1 is the feeding end, which is connected to the upstream feeding vibrating conveyor 7 of the leaf-shaped air classifier. The low end of the transmission trough 1-1 is the discharge end, which has a first discharge port and a second discharge port. The first discharge port is connected to the discharge hopper 1-5 for the material falling below the screening bars.
[0033] The air-separating feeding unit 2 includes an air-separating feeding unit housing 2-2, a high-speed conveyor belt 2-4, a first partition 2-5, a closed ejector 2-6, a second partition 2-7, an air pressure plate cavity 2-9, and an air pressure plate 2-10. The high-speed conveyor belt 2-4 and the closed ejector 2-6 are respectively installed on the air-separating feeding unit housing 2-2 as the two feeding ends of the air-separating feeding unit 2. The second discharge port extends into the air-separating feeding unit housing 2-2 and connects to the high-speed conveyor belt 2-4. The discharge hopper 1-5 is connected to the closed ejector 2-6. An air pressure plate cavity 2-9 and an air pressure plate 2-10 are installed above the high-speed conveyor belt 2-4. An air pressure plate 2-10 is installed on the lower side of the air pressure plate cavity 2-9 to adjust the flow of the blade air separator through the air-separating feeding unit 2-2. The gas intake is adjusted to ensure the airflow velocity in the channel between the first partition 2-5 and the second partition 2-7. The first partition 2-5 and the second partition 2-7 are provided below the high-speed conveyor belt 2-4. The lower ends of the first partition 2-5 and the second partition 2-7 are respectively fixed to the bottom of the inner cavity of the air classifier feeding unit box 2-2. The area between the first partition 2-5 and the second partition 2-7 forms an airflow channel. The airflow channel is connected to the airflow channel of the leaf filament air classifier discharge hopper component 4. The difference in suspension velocity is used to separate the small-sized material from most of the stems mixed in. The stems fall and leave the production line through the leaf filament air classifier discharge hopper component 4. The leaf filaments move upward with the airflow and enter the middle box of the leaf filament air classifier through the channel between the first partition 2-5 and the lower part of the high-speed conveyor belt 2-4.
[0034] Specifically, the cross-sectional dimensions of the channel between the first partition 2-5 and the lower part of the high-speed conveyor belt 2-4, and the airflow channel between the first partition 2-5 and the second partition 2-7 are different, so as to obtain different airflow velocities and realize differentiated air separation treatment of materials and stems of different shapes and sizes in the blades.
[0035] Specifically, the bracket 6 is connected to the side plate 5 of the leaf filament air separator conveying component via the bracket connecting plate 6-1.
[0036] Specifically, the air separation feeding unit 2 is fixed to the side plate 5 of the conveying component of the leaf filament air separator via the air separation feeding unit flange 2-1, and is connected to the middle box 3 of the leaf filament air separator via the middle box flange 3-1.
[0037] Specifically, the high-speed conveyor belt 2-4 and the enclosed feeder 2-6 correspond to different airflow velocities and air distribution methods.
[0038] Specifically, the high-speed conveyor belt 2-4 and the enclosed feeder 2-6 can be adjusted to change the state of the material.
[0039] Example 2
[0040] The present invention provides a method for feeding a blade air classifier to improve air separation efficiency, the method specifically comprising the following steps:
[0041] S1, the incoming material pretreatment unit 1 connects to the material fed by the upstream feeding vibrating conveyor 7 of the conveying blade air separator, and during the conveying process, the material is screened and separated by screening bars 1-4 according to the different shapes and sizes of the material and stems, while the material is loosened to a certain extent.
[0042] S2. After screening and separation, the larger materials and a small amount of stems located above the screening bar 1-4 enter the high-speed conveyor belt 2-4 of the air classifier feeding unit 2 through the outlet of the transmission trough 2. The larger materials and the small amount of stems mixed in are separated by the inertia of the materials after leaving the high-speed conveyor belt 2-4 and the airflow speed in the channel between the first partition 2-5 and the lower part of the high-speed conveyor belt 2-4. The stems fall and leave the production line through the waste hopper component 4 of the leaf air classifier. The leaf enters the middle box 3 of the leaf air classifier and settles down onto the conveyor belt 5-1 of the leaf air classifier and is conveyed to the discharge device of the leaf air classifier to enter the downstream equipment.
[0043] S3. After screening and separation, the small-sized material located below the screening bar 1-4 is fully thrown into the airflow channel between the first partition 2-5 and the second partition 2-7 through the closed thrower 2-6 of the air classifier feeding unit 2 via the feeding hopper 1-5. It is connected to the airflow channel of the leaf filament air classifier discharge hopper component 4. The small-sized material is separated from most of the stems mixed in by the difference in suspension velocity. The stems fall and leave the production line through the leaf filament air classifier discharge hopper component 4. The leaf filaments move upward with the airflow and enter the inner box 3 of the leaf filament air classifier through the channel between the first partition 2-5 and the lower part of the high-speed conveyor belt 2-4. They settle down and fall together with the leaf filaments after air classification in the above S2 process. Then, they are conveyed by the leaf filament air classifier conveyor belt 5-1 to the discharge device of the leaf filament air classifier and enter the downstream equipment.
[0044] S4. In the above S2 and S3 processes, materials that are too large or have a large shape and size can fall and enter the current blade air classifier's waste hopper component 4 for further processing and air separation according to the existing loosening and de-agglomeration mode, thereby completing the entire feeding process of the blade air classifier's auxiliary air separation.
[0045] Specifically, the conveyor trough 1-1 of the incoming material pretreatment unit 1 is equipped with multiple sets of screening bars 4, with a drop between each set, which allows the material to tumble. The bar structure can enter the material flow accumulation body to a certain extent during vibration, thereby improving screening efficiency to a certain extent while reducing the amount of material with larger shape and size falling into the lower layer of the screening bars 4. This is beneficial for ensuring the amount of stems and twigs removed in the subsequent air separation process, and avoids the impact of high airflow velocity caused by material with larger shape and size on air separation efficiency and tobacco loss.
[0046] Specifically, the conveying trough 1-1 of the incoming material pretreatment unit 1 provides high-frequency, low-amplitude vibration through the high-frequency vibration motor 1-2, which can contact the material multiple times and extend the conveying and screening time of the material on the screening bar 4. This is beneficial for loosening materials with large shapes and sizes, and for more small free materials and stems to fall into the lower layer of the screening bar 4. This ensures the amount of stems removed in the subsequent air separation process and avoids the impact of high airflow velocity caused by large materials on air separation efficiency and tobacco loss.
[0047] Specifically, the incoming material pretreatment unit 1, through the screening bar 4 and under the action of the high-frequency vibration motor 1-2, realizes the flow decomposition of the material, reduces the material-to-air ratio in the subsequent air separation process, and helps to ensure the air separation efficiency.
[0048] Specifically, the high-speed conveyor belt 2-4 of the air separation feeding unit 2 can spread and convey large materials and provide a certain air separation surface by throwing speed. The enclosed throwing device 2-6 can quickly throw small materials in, so that the materials are relatively free and dispersed and extended, while avoiding the existence of horizontal airflow, which is conducive to ensuring air separation efficiency.
[0049] Specifically, the first drive motor 2-3 and the second drive motor 2-8 corresponding to the high-speed conveyor belt 2-4 and the enclosed feeder 2-6 can change the post-throwing state of the material by adjusting the frequency parameters, thereby assisting in adjusting the air separation effect.
[0050] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this invention and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.
[0051] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this invention, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.
[0052] In this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection, an electrical connection, or a connection that allows communication between them; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.
[0053] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "over," and "on top" of the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.
[0054] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.
[0055] Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of the present invention.
Claims
1. A feeding device for a blade air classifier that can improve air separation efficiency, characterized in that, The assembly includes an incoming material pretreatment unit (1), an air-separation feeding unit (2), and a support (6). The air-separation feeding unit (2) and the support (6) are respectively fixed on the side plate (5) of the conveying component of the leaf-fiber air classifier. The incoming material pretreatment unit (1) is fixed on the support (6). The air-separation feeding unit (2) is connected to the middle box (3) of the leaf-fiber air classifier. The incoming material pretreatment unit (1) includes a transmission trough (1-1), a high-frequency vibration motor (1-2), a support spring (1-3), a screening bar (1-4), and a feeding hopper (1-5). The high-frequency vibration motor (1-2) is located at the bottom of the transmission trough (1-1), and the transmission trough (1-1) is inclinedly mounted on a support (6) via the support spring (1-3). The upper end of the support spring (1-3) is installed at the bottom of the transmission trough (1-1), and the other end is installed at the bottom of the support spring (1-4). The top of the support (6) is provided with several screening bars (1-4) spaced apart along the length of the transmission trough (1-1), i.e., the material conveying direction; the high end of the transmission trough (1-1) is the feeding end, which is connected to the upstream feeding vibrating conveyor (7) of the leaf filament air classifier; the low end of the transmission trough (1-1) is the discharge end, which has a first discharge port and a second discharge port, and the first discharge port is connected to the hopper (1-5) for the material to fall below the screening bars; The air-separating feeding unit (2) includes an air-separating feeding unit housing (2-2), a high-speed conveyor belt (2-4), a first partition (2-5), a closed ejector (2-6), a second partition (2-7), an air pressure plate cavity (2-9), and an air pressure plate (2-10). The air-separating feeding unit housing (2-2) is respectively provided with the high-speed conveyor belt (2-4) and the closed ejector (2-6) as the two feeding ends of the air-separating feeding unit (2). The second discharge port extends into the air-separating feeding unit housing (2-2) and is connected to the high-speed conveyor belt (2-4). The discharge hopper (1-5) is connected to the closed ejector (2-6). The air pressure plate cavity (2-9) and the air pressure plate (2-10) are provided above the high-speed conveyor belt (2-4). The air pressure plate (2-10) is provided below the side of the air pressure plate cavity (2-9). 0), used to adjust the amount of gas entering the air classifier through the air classifier feeding unit box (2-2); a first partition (2-5) and a second partition (2-7) are provided below the high-speed conveyor belt (2-4). The lower ends of the first partition (2-5) and the second partition (2-7) are respectively fixed at the bottom of the inner cavity of the air classifier feeding unit box (2-2). An airflow channel is formed in the area between the first partition (2-5) and the second partition (2-7). The airflow channel is connected to the airflow channel of the air classifier discharge hopper component (4). The difference in suspension speed is used to separate the small material and most of the stems mixed in it. The stems fall and leave the production line through the air classifier discharge hopper component (4). The filaments move upward with the airflow and enter the middle box of the air classifier through the channel between the first partition (2-5) and the high-speed conveyor belt (2-4).
2. The feeding device for a blade air classifier that can improve air separation efficiency as described in claim 1, characterized in that, The cross-sectional dimensions of the channel between the first partition (2-5) and the high-speed conveyor belt (2-4) and the airflow channel between the first partition (2-5) and the second partition (2-7) are different, so as to obtain different airflow velocities and realize differentiated air separation treatment of materials and stems of different shapes and sizes in the blades.
3. The feeding device for a blade air classifier that can improve air separation efficiency as described in claim 2, characterized in that, The bracket (6) is connected to the side plate (5) of the blade air separator conveying component via the bracket connecting plate (6-1).
4. The feeding device for a blade air classifier that can improve air separation efficiency as described in claim 3, characterized in that, The air separation feeding unit (2) is fixed to the side plate (5) of the conveying component of the leaf air separator via the air separation feeding unit flange (2-1), and is connected to the middle box (3) of the leaf air separator via the middle box flange (3-1).
5. The feeding device for a blade air classifier that can improve air separation efficiency as described in claim 4, characterized in that, The high-speed conveyor belt (2-4) and the enclosed feeder (2-6) correspond to different airflow velocities and air distribution methods.
6. The feeding device for a blade air classifier that can improve air separation efficiency as described in claim 5, characterized in that, The high-speed conveyor belt (2-4) and the enclosed ejector (2-6) are respectively driven and connected to the first drive motor (2-3) and the second drive motor (2-8) to change the post-throwing state of the material and assist in adjusting the air separation effect.
7. A method for feeding materials into a blade air classifier to improve air separation efficiency, characterized in that, The feeding device for the blade air classifier, as described in claim 6, which can improve air separation efficiency, specifically includes the following steps: S1. The incoming material pretreatment unit connects to the material fed by the upstream vibrating conveyor of the conveyor blade air separator. During the conveying process, the material is screened and separated by screening bars according to the different shapes and sizes of the material and stems, and the material is loosened to a certain extent. S2. After screening and separation, the larger materials and a small amount of stems located above the screening bar enter the high-speed conveyor belt of the air classifier feeding unit through the second discharge port of the transmission trough. The separation of the larger materials and the small amount of stems mixed in is completed by the combination of the inertia of the materials after leaving the high-speed conveyor belt and the airflow speed in the separation position area. The stems fall and leave the production line through the waste hopper of the blade air classifier. The blades enter the inner box of the blade air classifier, settle down and fall onto the conveyor belt of the blade air classifier and are conveyed to the discharge device of the blade air classifier to enter the downstream equipment. S3. After screening and separation, the small-sized material located below the screening bar is fully thrown into the airflow channel of the air classifier feeding unit through the closed thrower of the feeding hopper and connected to the airflow channel of the leaf filament air classifier discharge hopper component. The small-sized material is separated from most of the stems mixed in by the difference in suspension velocity. The stems fall and leave the production line through the discharge hopper component of the leaf filament air classifier. The leaf filaments move upward with the airflow and enter the inner box of the leaf filament air classifier through the channel under the high-speed conveyor belt, settle down and fall together with the leaf filaments after air classification in the above S2 process. Then, the leaf filaments are conveyed by the conveyor belt component of the leaf filament air classifier to the discharge device of the leaf filament air classifier and enter the downstream equipment. S4. In the above steps S2 and S3, materials that are too large or have a large shape and size can fall and enter the current blade air classifier's waste hopper component for further processing and air separation according to the existing loosening and de-agglomeration mode, thereby completing the entire feeding process of the blade air classifier's auxiliary air separation.
8. The method for feeding blades into an air classifier to improve air separation efficiency as described in claim 7, characterized in that, The high-speed conveyor belt (2-4) can spread and transport large materials and provide a certain air separation surface by throwing speed. The closed throwing device (2-6) can quickly throw small materials, so that the materials are relatively free and dispersed and extended, while avoiding the existence of horizontal airflow, which is conducive to ensuring air separation efficiency.