Two-stage winnowing material throwing device and two-stage winnowing system

Abstract

The utility model provides a two-stage winnowing material throwing device which comprises a main body and a shell, the main body is contained in the shell, the main body comprises a main shaft, an end cover and a plurality of blades, and the blades surround the main shaft and are fixed to the main shaft and the end cover; the shell comprises a feeding port, a discharging port and a middle shell part located between the feeding port and the discharging port, the feeding port receives raw materials from an upstream first-stage winnowing system and throws the raw materials into a downstream second-stage winnowing bin from the discharging port, and the shell is characterized in that the feeding port receives the raw materials from the upstream first-stage winnowing system and throws the raw materials into the downstream second-stage winnowing bin from the discharging port; and the middle shell part is designed to enable raw materials entering from the feeding hole to leave the discharging hole in an obliquely upward direction. According to the two-stage winnowing material throwing device, materials can be effectively and fully winnowed, and the winnowing effect is improved. The utility model further provides a two-stage winnowing system which comprises the two-stage winnowing material throwing device.

Description

Technical Field

[0001] The present application relates to air separation equipment, and in particular, to a throwing device for secondary air separation and a secondary air separation system. Background Art

[0002] Air separation is a process often used in industrial production. The working principle of air separation is that materials of different materials, densities, sizes and shapes are subjected to different forces under the action of airflow, so air separation is the process of using airflow to separate different materials.

[0003] During the air separation process, the material enters the separation chamber from the feed port and is separated by airflow in the separation chamber. The material in the airflow will produce different motion states under the action of the airflow according to its own characteristics. For example, for materials with lower density, they will be adsorbed at a higher position under the action of the airflow; while materials with higher density will settle to a lower position. At the same time, materials of different sizes are distributed in different areas, thereby achieving material separation.

[0004] Air separation is usually divided into multiple stages. For example, in the tobacco production industry, in the cigarette making workshop, the tobacco wind selection system can adopt a secondary air selection system to remove impurities (mainly uncut leaves, leaf sticks, tobacco stems, impurities, etc.) in the tobacco after drying. The secondary air selection system includes a primary air selection system and a secondary air selection system, and its working principle is as follows: the tobacco is preliminarily selected by the primary air selection system, wherein the pure tobacco screened out enters the production line through the primary air selection discharge air lock, and a small part of the tobacco and stem sticks mixed tobacco raw materials (generally 10% of the total tobacco amount) mainly composed of silk balls and wet balls fall from the impurity hopper, and after quantitative determination, enter the secondary air selection system for selection, wherein the pure tobacco screened out falls from the secondary air selection discharge air lock, and stem sticks and wet balls and other impurities fall from the secondary mesh belt machine air lock, and finally the pure tobacco screened by the primary air selection system and the pure tobacco screened by the secondary air selection system are sent to the subsequent process together.

[0005] Among them, in the existing secondary air separation system, the secondary air separation and throwing device usually adopts a four-blade or six-blade structure, and the discharge direction of the shell of the secondary air separation and throwing device is usually horizontal, or even slightly below the horizontal.

[0006] The existing two-stage air separation and throwing device has the following problems:

[0007] 1. The amount of material thrown in each blade compartment is too large, the particle size of the thrown material is large, and it is easy to agglomerate, resulting in the material not being effectively air-selected; and

[0008] 2. The material is thrown horizontally and falls on the bottom screen plate before being fully air-selected. Once the material falls on the screen plate, it is not easy to be effectively air-selected. Summary of the invention

[0009] In view of the above problems existing in the prior art, an improved secondary air separation and throwing device of the present application is provided.

[0010] According to one object of the present application, a two-stage air separation and throwing device is provided, in which materials are thrown upward, thereby extending the path of the materials before landing on the bottom plate, so as to fully perform air separation.

[0011] According to another object of the present application, a two-stage air separation and throwing device is provided, in which the amount of throwing material in each blade compartment is reduced, the particle size of the thrown material is moderate, and it is not easy to agglomerate, so that the material can be effectively air-separated.

[0012] To achieve the above objectives, the present application provides a secondary air separation and throwing device, comprising: a main body and an outer shell, wherein the main body is accommodated in the outer shell, wherein the main body comprises: a main shaft, an end cover and a plurality of blades, wherein the blades are fixed on the main shaft and the end cover around the main shaft; the outer shell comprises: a feed port and a discharge port and an intermediate shell portion located between the feed port and the discharge port, wherein the feed port receives raw materials from an upstream primary air separation system, and throws the raw materials from the discharge port into a downstream secondary air separation bin, and is characterized in that the intermediate shell portion is designed so that the raw materials entering from the feed port leave the discharge port in an oblique upward direction.

[0013] Preferably, the intermediate shell part is configured such that in the cross section of the shell, the intermediate shell part includes: a straight portion adjacent to the feed port, a first arc portion located between the straight portion and the discharge port, and a second arc portion located between the feed port and the discharge port, wherein the first arc portion and the second arc portion are concentric with the main body, and at the installation position of the secondary air separation and throwing device, a vertical straight line passing through the center of the circle A of the cross section of the main body intersects with the first arc portion at a point B, and along the path direction of the raw material from the feed port to the discharge port, the end point C of the first arc portion at the discharge port exceeds the point B. Therefore, the raw material reaches the discharge port along the first arc portion from the feed port under the driving action of the rotation of the main body, and leaves from the discharge port along the oblique upward tangent direction F. The throwing along the oblique upward direction causes the raw material to experience a longer air separation path in the secondary air separation bin before reaching the sieve plate at the bottom, thereby facilitating sufficient air separation of the raw material.

[0014] Preferably, the center A and the point B define a straight line AB, the center A and the end point C define a straight line AC, and the angle between the straight line AB and the straight line AC is less than 90°.

[0015] Preferably, the angle between the straight line AB and the straight line AC is in the range of 10° to 60°.

[0016] Preferably, the extension line of the straight portion is tangent to the circular cross-section of the main body, which is more conducive to the raw materials entering from the feed port to leave the discharge port along the first arc portion along the oblique upward tangent direction F under the rotation of the main body.

[0017] Preferably, the feed opening is horizontal so as to receive the vertically falling raw materials with the largest cross-sectional area.

[0018] Preferably, the body comprises more than six blades.

[0019] Preferably, the body comprises 12 blades.

[0020] The present application also provides a secondary air separation system, including: a secondary air separation bin, an air duct, a bin body, a secondary air separation discharge air lock, and a secondary air separation bin discharge belt, characterized in that it also includes a secondary air separation throwing device as described above.

[0021] The present application provides an improved secondary air separation and throwing device, which can supply mixed tobacco raw materials into the secondary air separation bin in a smaller dose, and throw the mixed tobacco raw materials into the secondary air separation bin in a downward direction, thereby improving the air separation effect of the mixed tobacco raw materials in the secondary air separation bin, so that the mixed tobacco raw materials are fully air-separated in the secondary air separation bin. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Aspects of the present disclosure will be better understood after reading the following detailed description in conjunction with the accompanying drawings, in which:

[0023] Figure 1 is a schematic diagram of a two-stage air separation system of the prior art;

[0024] Figure 2a yes Figure 1 A perspective view of the main body of the secondary air separation and throwing device used in;

[0025] Figure 2b yes Figure 1 A front view of the main body of the secondary air separation and throwing device used in;

[0026] Figure 2c yes Figure 1 A left side view of the main body of the secondary air separation and throwing device used in;

[0027] Figure 3 yes Figure 1 A schematic cross-sectional view of the housing of a secondary air separation and throwing device used in;

[0028] Figure 4a is a stereoscopic diagram of the main body of the secondary air separation and throwing device according to the present application;

[0029] Figure 4b It is a front view of the main body of the secondary air separation and throwing device according to the present application;

[0030] Figure 4c is a left view of the main body of the secondary air separation and throwing device according to the present application; and

[0031] Figure 5 It is a schematic cross-sectional view of the outer shell of the stage air separation and throwing device according to the present application. DETAILED DESCRIPTION

[0032] The present disclosure will be described below with reference to the accompanying drawings, wherein the accompanying drawings illustrate several embodiments of the present disclosure. However, it should be understood that the present disclosure can be presented in a variety of different ways and is not limited to the embodiments described below; in fact, the embodiments described below are intended to make the disclosure of the present disclosure more complete and fully illustrate the scope of protection of the present disclosure to those skilled in the art. It should also be understood that the embodiments disclosed herein can be combined in various ways to provide more additional embodiments.

[0033] It should be understood that the same reference numerals represent the same elements throughout the drawings. In the drawings, the dimensions of certain features may be distorted for clarity.

[0034] It should be understood that the terms used in the specification are only used to describe specific embodiments and are not intended to limit the present disclosure. All terms (including technical terms and scientific terms) used in the specification have the meanings commonly understood by those skilled in the art unless otherwise defined. For the sake of simplicity and / or clarity, well-known functions or structures may not be described in detail.

[0035] See also Figure 1-3 , which shows a prior art two-stage wind separation system, wherein Figure 1 A schematic diagram showing an existing two-stage air separation system is shown. Figure 2a A three-dimensional diagram showing the main body of a secondary air separation throwing device of an existing secondary air separation system, Figure 2b The main body of the existing secondary air separation and throwing device is shown in the front view. Figure 2c The left side view of the main body of the existing two-stage air separation and throwing device is shown. Figure 3 A schematic cross-sectional view of the outer shell of an existing two-stage air separation and throwing device is shown.

[0036] like Figure 1As shown, the mixed tobacco raw materials (mainly silk balls and wet balls with a small amount of tobacco and stems) screened by the primary air separation system (not shown) are supplied from the primary air separation screened material mesh belt 3 to the conveyor belt 9 through the primary sealing and discharging air lock 10, and are then supplied from the conveyor belt 9 to the secondary air separation system.

[0037] The existing secondary air separation system 1 mainly includes: a secondary air separation throwing device 4, a secondary air separation bin 7, an air duct 5, a bin body 8, a secondary air separation discharge air lock 11, a secondary air separation bin discharge belt 6, etc. The mixed tobacco raw material is thrown into the secondary air separation bin 7 by the secondary air separation throwing device 4, and the screen plate 2 at the bottom of the secondary air separation bin 7 has an upward process airflow. Under the action of the process airflow, the leaf shreds have a low suspension speed and are transported to the bin body 8 by the air duct 5, and fall through the secondary air separation discharge air lock 11. The leaves, leaf sticks, tobacco stems and other debris that have not been cut into shreds have a high suspension speed, so they cannot be sucked away by the airflow and fall onto the screen plate 2, so as to achieve the purpose of separating debris, improving the purity of the leaf shreds and improving the quality of cigarettes.

[0038] The secondary air separation and throwing device 4 plays the role of sealing the secondary air separation bin 7 and throwing materials. The existing secondary air separation and throwing device 4 includes a main body 12 ( Figure 2a , 2b , 2c) and housing 16 ( Figure 3 ), wherein the main body 12 is accommodated in the housing 16. Figure 2a , 2b As shown in Figures 2 and 2c, the main body 12 includes a main shaft 13, an end cover 15 and a plurality of blades 14, and the plurality of blades are fixed on the main shaft 13 and the end cover 15 around the main shaft 13. In the secondary air separation throwing device 4 of the prior art, the main body 12 usually adopts four or six blades 14, so that a larger compartment 19 is formed between two adjacent blades 14, so that the mixed tobacco raw material is thrown into the secondary air separation chamber 7 in a larger dose. As mentioned above, a larger dose of mixed tobacco raw material is easy to agglomerate, so it is not easy to be fully air-separated in the secondary air separation chamber 7.

[0039] like Figure 3As shown, the shell 16 of the secondary air separation and throwing device 4 includes a feed port 17, a discharge port 18, and intermediate shell parts 40 and 41 located between the feed port 17 and the discharge port. The feed port 17 receives the mixed tobacco raw material from the primary air separation system conveyed by the conveyor belt 9, and throws the mixed tobacco raw material from the discharge port 18 into the secondary air separation bin 7 approximately horizontally; the intermediate shell parts 40 and 41 include an arc profile and a straight profile. As described above, since the discharge direction of the secondary air separation and throwing device 4 is basically horizontal, and even slightly inclined downward due to processing, installation and other reasons, the mixed tobacco raw material falls onto the screen plate 2 at the bottom of the secondary air separation bin 7 before being fully air-selected, and therefore cannot be effectively air-selected.

[0040] The present application provides an improved secondary air separation and throwing device, which can supply mixed tobacco raw materials into the secondary air separation bin 7 in smaller doses, and throw the mixed tobacco raw materials into the secondary air separation bin 7 in a downward and upward direction, thereby improving the air separation effect of the mixed tobacco raw materials in the secondary air separation bin 7, so that the mixed tobacco raw materials are fully air-separated in the secondary air separation bin 7.

[0041] Similar to the secondary air separation and throwing device 4 of the prior art, the secondary air separation and throwing device according to the present application also plays the role of sealing the secondary air separation bin 7 and the thrown materials. The secondary air separation and throwing device of the present application comprises: a main body 20 and a shell 24, wherein the main body 20 is accommodated in the shell 24. Figure 4a , 4b 4c respectively show a stereoscopic view, a front view and a left view of the main body 20 of the improved secondary air separation and throwing device according to the present application, Figure 5 A schematic cross-sectional view of the housing 24 of the improved secondary air separation and throwing device according to the present application is shown.

[0042] First refer to Figure 4a , 4b 4c illustrates the main body 20 of the secondary air separation and throwing device according to the present application. Figure 4a , 4bAs shown in Figures 4 and 4c, the main body 20 includes: a main shaft 21, an end cover 23 and twelve blades 22, wherein the blades 22 are fixed on the main shaft 21 and the end cover 23 around the main shaft 21. Since the main body 20 has twelve blades 22, the compartment 27 formed between two adjacent blades 22 has a smaller accommodation space than the prior art, so the mixed tobacco raw material can be thrown into the secondary air separation chamber 7 in a smaller dose through the smaller compartment 27. When the conveying speed of the conveying belt 9 is constant, the flow rate of the mixed tobacco raw material is constant. The same amount of mixed tobacco raw material is conveyed to the secondary air separation chamber 7 in a smaller dose by the secondary air separation throwing device of the twelve blades of the present application compared with the throwing device of the four or six blades of the prior art. The mixed tobacco raw material of a smaller dose is not easy to agglomerate, so it can be fully air-selected in the secondary air separation chamber 7. Moreover, the twelve blades 22 enable the main body 20 of the secondary air separation and throwing device according to the present application to better seal the secondary air separation bin 7, thereby better isolating the external air from the process airflow in the secondary air separation bin 7, weakening the interference of the feed or external air on the airflow field of the secondary air separation bin 7, and being more conducive to controlling the air separation effect. As known to those skilled in the art, other numbers of blades greater than those in the prior art may also be used, such as 7, 8, 9, 10, 14, etc.

[0043] like Figure 5 As shown, the housing 24 of the secondary air separation and throwing device according to the present application includes a feed port 25 and a discharge port 26 and an intermediate housing portion 28 located between the feed port 25 and the discharge port 26. The feed port 25 receives the mixed tobacco raw material from the primary air separation system conveyed by the conveyor belt 9, and throws the mixed tobacco raw material from the discharge port 26 into the secondary air separation bin 7. The feed port 25 is substantially horizontal, so as to receive the vertically falling mixed tobacco raw material with the largest cross-sectional area. The intermediate housing portion 28 is designed so that the mixed tobacco raw material entering from the feed port 25 leaves the discharge port 26 in an obliquely upward direction.

[0044] Still see Figure 5In the cross section of the shell 24, it can be seen that the middle shell part 28 includes: a straight part 29 adjacent to the feed port 25, a first arc part 28 between the straight part 29 and the discharge port 26, and a second arc part 30 between the feed port 25 and the discharge port 26, wherein the first arc part 28 and the second arc part 30 are concentric with the main body 20. In addition, at the installation position of the secondary air separation and throwing device, a vertical straight line passing through the center of the circle A of the cross section of the main body intersects with the first arc part 28 at a point B, and along the path direction of the mixed tobacco raw material from the feed port 25 to the discharge port 26, the end point C of the first arc part 28 at the discharge port 26 exceeds point B. Therefore, the mixed tobacco raw material reaches the discharge port 26 from the feed port 25 along the first arc part 28 under the rotation and pushing action of the main body 20, and leaves the discharge port 26 along the oblique upward tangent direction F. The throwing in the oblique upward direction causes the mixed tobacco raw material to experience a longer air separation path in the secondary air separation bin 7 before reaching the bottom screen plate 2, thereby facilitating sufficient air separation of the mixed tobacco raw material.

[0045] Preferably, the angle between the straight line AB and the straight line AC is less than 90°, for example, in the range of 10° to 60°.

[0046] Preferably, the extension line of the straight portion 29 is tangent to the circle of the cross section of the main body 20, which is more conducive to the mixed tobacco raw material entering from the feed port 25 to leave the discharge port 26 along the first arc portion 28 along the oblique upward tangent direction F under the rotation of the main body 20.

[0047] In summary, the present application can bring the following beneficial effects: reducing the dosage of materials entering the secondary air separation bin, and changing the initial velocity direction of the materials after being transported through the secondary air separation throwing device, thereby improving the air separation effect.

[0048] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, the elements defined by the sentence "comprise a ..." do not exclude the existence of other identical elements in the process, method, article or device including the elements.

[0049] The above shows and describes the basic principle and main features of the utility model and the advantages of the utility model. The technicians in this industry should understand that the utility model is not limited by the above embodiments, and the above embodiments and descriptions are only for explaining the principle of the utility model. Without departing from the spirit and scope of the utility model, the utility model will have various changes and improvements, and these changes and improvements fall within the scope of the utility model to be protected.

Claims

1. A two-stage wind separation and throwing device, comprising: A body and a housing, wherein the body is accommodated in the housing, wherein, The main body comprises: a main shaft, an end cover and a plurality of blades, wherein the blades surround the main shaft and are fixed on the main shaft and the end cover; The housing comprises: a feed inlet and a discharge outlet and an intermediate housing portion located between the feed inlet and the discharge outlet, wherein the feed inlet receives raw materials from an upstream primary air separation system and throws the raw materials from the discharge outlet into a downstream secondary air separation bin, The invention is characterized in that the intermediate shell part is designed so that the raw materials entering from the feed port leave the discharge port in an oblique upward direction.

2. The secondary air separation and throwing device according to claim 1 is characterized in that: The intermediate shell portion is configured such that, in a cross section of the shell, the intermediate shell portion includes: a straight portion adjacent to the feed port, a first arc portion located between the straight portion and the discharge port, and a second arc portion located between the feed port and the discharge port, wherein the first arc portion and the second arc portion are concentric with the main body, and At the installation position of the secondary air separation and throwing device, a vertical straight line passing through the center point A of the cross section of the main body intersects with the first arc-shaped portion at a point B. Along the path direction of the raw material from the feed port to the discharge port, the endpoint C of the first arc-shaped portion at the discharge port exceeds the point B.

3. The secondary air separation and throwing device according to claim 2 is characterized in that: The center A and the point B define a straight line AB, the center A and the end point C define a straight line AC, and the angle between the straight line AB and the straight line AC is less than 90°.

4. The secondary air separation and throwing device according to claim 3 is characterized in that: The angle between the straight line AB and the straight line AC is in the range of 10° to 60°.

5. The secondary air separation and throwing device according to claim 2 is characterized in that: An extension line of the straight line portion is tangent to the circle of the cross section of the body.

6. The secondary air separation and throwing device according to claim 1 is characterized in that: The feed inlet is horizontal.

7. The secondary air separation and throwing device according to any one of claims 1 to 6, characterized in that: The main body includes more than 6 blades.

8. The secondary air separation and throwing device according to claim 7 is characterized in that: The main body includes 12 blades.

9. A two-stage air separation system, comprising: Secondary air separation bin, air duct, bin body, secondary air separation discharge air lock, secondary air separation bin discharge belt, It is characterized in that it also includes a secondary air separation and throwing device according to any one of claims 1-8.

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