Impurity removal system and dryer

Abstract

The utility model provides an impurity removal system, a dryer and an adjusting assembly, the adjusting assembly is movably installed at an air supplement window and used for increasing or reducing the ventilation area of the air supplement window and enabling a critical speed position to be formed between the air supplement window and an impurity outlet, V1 is larger than V suspension, V temporary is larger than V2, V1 is the airflow speed between the critical speed position and the impurity outlet, and V2 is larger than V suspension. V suspension is the suspension airflow velocity of the grain dried by the dryer, V is the airflow velocity at the critical velocity position, and V2 is the airflow velocity between the critical velocity position and the impurity extraction port. The air supplement window is arranged on the impurity removal pipeline, V1 is larger than V2, and the air volume adjustment of the adjusting assembly capable of adjusting the air volume is matched, so that the airflow velocity relation that V1 is larger than V, suspension is larger than V and temporary is larger than V2 is formed on the impurity removal pipeline in the impurity conveying direction, the impurity removal effect is ensured to be maximized, and grains can be prevented from being pumped away.

Description

TECHNICAL FIELD

[0001] The utility model belongs to the technical field of grain drying, especially relates to a system and dryer for removing impurities. BACKGROUND

[0002] Grain dryer is the core equipment of drying center. Domestic dryer has been introduced and digested foreign products since 1970s, along with people's attention to grain safety and quality, promotes the rapid development of dryer industry, and the dryer is also developing towards automation, convenient operation and high performance. In order to improve the quality of grain after drying, low-temperature batch type circulating dryer is widely used, at present, users put forward higher requirements to the performance of the dryer for removing impurities, and many manufacturers will separately configure a set of impurity removal system.

[0003] The impurity removal system of the dryer mainly removes impurities through the principle of air selection, that is, according to the different suspension airflow velocities of grain and impurities, the grain and impurities are separated by adjusting the air velocity; The impurity removal system is arranged at the material throwing position, that is, the discharge position of the elevator, at which position the grain and impurities are in a dispersed state, and the grain and impurities are easy to separate; However, improper design of the impurity outlet will cause the grain and impurities to be sucked out together, which will inevitably cause the loss of user's grain. UTILITY MODEL CONTENTS

[0004] The utility model discloses a kind of impurity removal system and dryer, to solve the technical problem that the impurity removal system in prior art will suck out grain and impurities together.

[0005] In order to achieve the above purpose, the utility model provides an impurity removal system for the dryer for drying grain, the impurity removal system includes: impurity removal pipeline, two ends are respectively impurity suction port and impurity outlet, the impurity suction port is used to connect with the lifting system of the dryer, the impurity outlet is used to connect ash storage room, air supplement window is opened on the impurity removal pipeline, the air supplement window is located between the impurity suction port and the impurity outlet, and the air supplement window is used to communicate inside and outside atmosphere of the impurity removal pipeline;Adjusting assembly is movably installed at the air supplement window and is used to increase or reduce the ventilation area of the air supplement window, to form critical speed position between the air supplement window and the impurity outlet, and V1>Vsuspension>Vcritical>V2, wherein V1 is the airflow velocity between the critical speed position and the impurity outlet, Vsuspension is the suspension airflow velocity of the grain dried by the dryer, Vcritical is the airflow velocity at the critical speed position, and V2 is the airflow velocity between the critical speed position and the impurity suction port.

[0006] In the embodiment of the utility model, the adjusting assembly comprises: a limiting frame, which is installed on the impurity removal pipeline and has an avoiding gap matching the air supplement window at the position corresponding to the air supplement window; an air adjusting door, which is in sliding connection with the limiting frame and can slide relative to the limiting frame and synchronously cover the air supplement window and the avoiding gap.

[0007] In the embodiment of the utility model, the adjusting assembly further comprises a limiting piece in movable connection with the limiting frame, which is used for limiting the air adjusting door on the limiting frame.

[0008] In the embodiment of the utility model, the air adjusting door comprises a shielding part for shielding the air supplement window, and the limiting frame is provided with a limiting stop edge for limiting the shielding part on one side close to the impurity removal opening.

[0009] In the embodiment of the utility model, one end of the shielding part away from the limiting stop edge is connected with a holding folded edge, and the holding folded edge is provided with a holding surface for holding.

[0010] In the embodiment of the utility model, the impurity removal pipeline comprises: a straight pipe section, an outlet of the straight pipe section being connected with the ash storage room through a connecting pipeline; an inclined pipe section, which is used for connecting the lifting system and an inlet of the straight pipe section, the inclined pipe section being upwardly inclined from the lifting system to the straight pipe section, and the air supplement window being arranged on the inclined pipe section.

[0011] In the embodiment of the utility model, the inclined angle of the inclined pipe section is a self-flowing angle enabling the grain to flow back from top to bottom.

[0012] In the embodiment of the utility model, the difference between Vfloat and Vnear is between 0.1 m / s and 0.2 m / s; and / or, a plurality of filter mesh holes are arranged on the air supplement window; and / or, the number of the air supplement windows is at least two.

[0013] The utility model also provides a dryer, which comprises a lifting system and the impurity removal system.

[0014] In the embodiment of the utility model, the dryer comprises a drying body, an upper conveying opening of the lifting system is connected with the top of the drying body through an upper conveying pipeline, and the connecting point of the impurity removal pipeline and the lifting system is higher than the connecting point between the lifting system and the upper conveying pipeline.

[0015] Through the above technical scheme, the impurity removal system provided by the embodiment of the utility model has the following beneficial effects:

[0016] When the impurities in the grain are removed by the impurity removal system, the grain with impurities in the lifting system can be lifted upward to a position close to the upper suction port of the impurity removal pipeline. The impurities in the grain can enter the impurity removal pipeline under the action of the suction wind of the ash storage room. When the system wind field of the dryer changes, the adjusting assembly can be adjusted to drive the adjusting assembly to move relative to the air supplement window, increase or decrease the ventilation area of the air supplement window and the external atmosphere, form a critical speed position between the air supplement window and the impurity outlet, and make the speed of each part of the impurity removal pipeline along the impurity conveying direction form a airflow speed relationship of V1>Vsuspension>Vcritical>V2, and Vsuspension is set to be close to Vcritical. Under this airflow speed relationship, as long as the grain does not splash to the critical speed position, the grain will not be taken to the ash storage room, so that the effect of removing impurities without taking away the grain is achieved, and it is ensured that the impurity removal system can cope with the complex working conditions of the dryer. The impurities can enter the ash storage room through the impurity removal pipeline and store the sucked impurities in the ash storage room. In the embodiment, the air supplement window is arranged on the impurity removal pipeline to make V1>V2, and the air volume of the adjusting assembly 2 is adjusted to make the airflow speed relationship of V1>Vsuspension>Vcritical>V2 along the impurity conveying direction on the impurity removal pipeline, so as to maximize the impurity removal effect and avoid taking away the grain.

[0017] Other features and advantages of the present application will be described in detail in the following specific embodiments. BRIEF DESCRIPTION OF DRAWINGS

[0018] The accompanying drawings are included to provide a further understanding of the present application, and constitute a part of the specification, and are used together with the following detailed description to explain the present application, but do not constitute a limitation on the present application. In the drawings:

[0019] Figure 1 is a structural schematic view of the impurity removal system according to an embodiment of the present application;

[0020] Figure 2 is a structural schematic view of the impurity removal pipeline in the impurity removal system according to an embodiment of the present application from one perspective;

[0021] Figure 3 is a structural schematic view of the impurity removal pipeline in the impurity removal system according to an embodiment of the present application from another perspective;

[0022] Figure 4 is a structural schematic view of the limiting frame in the impurity removal system according to an embodiment of the present application;

[0023] Figure 5 is a structural schematic view of the dryer according to an embodiment of the present application.

[0024] BRIEF DESCRIPTION OF DRAWINGS

[0025] 100 impurity removal system 211 limiting baffle

[0026] 1 impurity removal pipeline 22 air adjusting door

[0027] 11 impurity removal opening 221 shielding part

[0028] 12 impurity removal opening 222 holding folded edge

[0029] 13 air supplementing window 23 limiting member

[0030] 14 critical speed position 3 impurity removal fan

[0031] 15 straight pipe section 4 connecting pipeline

[0032] 16 inclined pipe section 200 drying machine

[0033] 17 interface circular pipe 210 lifting system

[0034] 18 flange plate 220 drying body

[0035] 2 adjusting assembly 230 upper conveying pipeline

[0036] 21 limiting frame DETAILED DESCRIPTION

[0037] The specific embodiments of the utility model are described in detail below in combination with the drawings. It should be understood that the specific embodiments described herein are only used for illustrating and explaining the utility model, and are not used for limiting the utility model.

[0038] The impurity removal system according to the utility model is described below with reference to the drawings.

[0039] As Figures 1 to 4As shown, in the embodiment of the utility model, the impurity removing system 100, the drying machine 200 for drying grain, the impurity removing system 100 includes the impurity removing pipeline 1 and the adjusting assembly 2, the impurity removing pipeline 1, two ends are respectively the impurity extracting port 12 and the impurity outlet 11, the impurity extracting port 12 is used for and the lifting system 210 of drying machine 200 is connected, the impurity removing pipeline 1 is set up with the air supplement window 13, the air supplement window 13 is located between the impurity extracting port 12 and the impurity outlet 11, and the air supplement window 13 is used for the intercommunication of the impurity removing pipeline 1 and the atmosphere outside;The entrance of the ash storage room can be provided with the impurity removing fan 3, and the impurity outlet 11 can be connected to the ash storage room through the impurity removing fan 3;The adjusting assembly 2 is movably installed at the air supplement window 13, the adjusting assembly 2 is used to increase or reduce the ventilation area of the air supplement window 13, and the critical speed position 14 between the air supplement window 13 and the impurity outlet 11 is formed, and V1>Vsuspension>Vcritical>V2, wherein V1 is the airflow velocity between the critical speed position 14 and the impurity outlet 11, Vsuspension is the suspension airflow velocity of the grain dried by the drying machine 200, Vcritical is the airflow velocity at the critical speed position 14, V2 is the airflow velocity between the critical speed position 14 and the impurity extracting port 12, and the difference between Vsuspension and Vcritical is between 0.1 m / s and 0.2 m / s.

[0040] It can be understood that the lifting system 210 is used for conveying grain in the vertical direction upward, for the convenience of connecting the impurity removing pipeline 1 and the lifting system 210, one end of the impurity removing pipeline 1 can be provided with a flange plate 18, which can conveniently connect the pipeline of the lifting system 210 through the flange plate 18, the cross-sectional dimension of the flange plate 18 is greater than that of the impurity removing pipeline 1, a plurality of connecting holes can be formed on the flange plate 18, the plurality of connecting holes are arranged at intervals along the circumference of the flange plate 18, and the pipeline of the lifting system 210 can be detachably connected with the flange plate 18 through a plurality of connecting pieces. The other end of the impurity removing pipeline 1 is provided with an interface circular tube 17 which is detachably connected with the connecting pipeline 4, and the impurity outlet 11 is arranged on the interface circular tube 17, the cross-sectional dimension of the interface circular tube 17 is smaller than that of the impurity removing pipeline 1, Vcritical is smaller than the suspension airflow velocity of the grain dried by the drying machine 200 and close to the drying Vsuspension, and in an embodiment, the difference between Vsuspension and Vcritical is between 0.1 m / s and 0.2 m / s.

[0041] When the impurity removal system 100 in the embodiment is used to remove the chaff and light impurities in the grain, the grain with impurities in the lifting system 210 can be lifted upward to a position close to the impurity removal port 12 of the impurity removal pipeline 1. The impurities in the grain can enter the impurity removal pipeline 1 under the action of the extraction wind of the ash storage room. When the system wind field of the dryer 200 changes, the adjusting assembly 3 can be adjusted to drive the adjusting assembly 3 to move relative to the air supplement window 13, increase or decrease the ventilation area of the air supplement window 13 and the external atmosphere, form the critical speed position 14 between the air supplement window 13 and the impurity outlet 11, and make the speed of each part of the impurity removal pipeline 1 in the direction of conveying impurities form the relationship of V1>Vsuspension>Vcritical>V2, and Vsuspension is set to be close to Vcritical. Under this airflow speed relationship, as long as the grain does not splash to the critical speed position 14, the grain will not be taken to the ash storage room, thereby achieving the effect of removing impurities without taking away the grain, and ensuring that the impurity removal system 100 can cope with the complex working conditions of the dryer 200. The impurities can enter the ash storage room through the impurity removal pipeline 1 and store the extracted impurities in the ash storage room. In the embodiment, the air supplement window 13 is arranged on the impurity removal pipeline 1 to make V1>V2, and the air volume of the adjusting assembly 2 is adjusted to make the airflow speed relationship of V1>Vsuspension>Vcritical>V2 along the direction of conveying impurities on the impurity removal pipeline 1, which ensures that the impurity removal effect is maximized and the grain is not taken away.

[0042] As shown in Figures 1 to 3 The impurity removal pipeline 1 includes a straight pipe section 15 and an inclined pipe section 16. The outlet of the straight pipe section 15 is connected to the impurity removal fan 3 through a connecting pipeline 4. The inclined pipe section 16 is used to connect the lifting system 210 and the inlet of the straight pipe section 15. The inclined pipe section 16 is upwardly inclined from the lifting system 210 to the straight pipe section 15. The air supplement window 13 is arranged on the inclined pipe section 16. In the embodiment, the inclined pipe section 16 is designed to be low at the inlet and high at the outlet, which can increase the resistance of the grain entering the ash storage room through the impurity removal pipeline 1, further avoid the situation that the grain is taken away by the impurity removal system 100, and make the grain fall back into the dryer 200 under the action of its own gravity through the inclined pipe section 16. Specifically, the connecting pipeline 4 is a hose. In an embodiment, the connecting pipeline 4 is a steel wire hose. The straight pipe section 15 with a connector pipe 17 is used to connect the connecting pipeline 4, which can facilitate the connection of the pipeline, avoid the influence of the deformation of the connecting pipeline 4 on the ventilation, facilitate the assembly of the impurity removal system 100, and ensure good impurity removal effect.

[0043] In an embodiment, the inclination angle of the inclined pipe section 16 is a self-flowing angle that can make the grain flow back from top to bottom. In the embodiment, the inclination angle of the inclined pipe section 16 can make the grain flow back into the dryer 200, avoid the situation that the grain is stranded in the impurity removal pipeline 1, and adapt to any working condition of the dryer 200 without taking away the grain.

[0044] It should be noted that the critical speed position 14 is a vertical plane of the position where the highest point of the inclined pipe section 16 is located. As shown in Figure 2 the critical speed position 14 is a vertical plane of the position indicated by the vertical dashed line, the length of the upper end surface of the straight pipe section 15 is less than the length of the upper end surface of the straight pipe section 15, and the critical speed position 14 is a position vertically downward from the tail of the upper end surface of the straight pipe section 15.

[0045] When the impurity removal system 100 in the embodiment is used to remove the chaff and light impurities in the grain, the adjusting assembly 2 moves relative to the air supplement window 13 to adjust the size of the air opening of the impurity removal pipeline 1 connected to the external atmosphere, to ensure the relationship of V1>Vsuspension>Vcritical>V2, and Vsuspension is set to be close to Vcritical. Under this air flow speed relationship, it can be ensured that as long as the grain does not splash to the critical speed position 14, the grain will not be taken to the ash storage room by the impurity removal fan 3, thereby achieving the effect of removing impurities without taking away the grain, and ensuring that the impurity removal system 100 can cope with the complex working conditions of the dryer 200. In an embodiment, the impurity removal fan 3 is a fan with adjustable air volume. In the case that the air volume of the impurity removal fan 3 cannot be accurately adjusted, the size of the air supplement at the air supplement window 13 can be adjusted by moving the adjusting assembly 2, to ensure that the impurity removal system 100 can always accurately remove dust.

[0046] As shown in Figure 1 , in an embodiment, the adjusting assembly 2 includes a limiting frame 21 and an air adjusting door 22, and in another embodiment, the adjusting assembly 2 includes a limiting frame 21, an air adjusting door 22, and a limiting piece 23. The limiting frame 21 is installed on the impurity removal pipeline 1 and has an avoiding gap matching the shape of the air supplement window 13 at the position corresponding to the air supplement window 13. The air adjusting door 22 is in sliding connection with the limiting frame 21 and can slide relative to the limiting frame 21 and synchronously cover the air supplement window 13 and the avoiding gap. The limiting frame 21 is hollow. By providing the avoiding gap, the air adjusting door 22 can conveniently adjust the ventilation area of the air supplement window 13. The limiting piece 23 is used to limit the air adjusting door 22 in the limiting frame 21. In the embodiment, the limiting frame 21 can be welded on the impurity removal pipeline 1. The limiting frame 21 has an avoiding gap in the middle and guide sliding grooves can be arranged on the upper and lower edges of the limiting frame 21. The air adjusting door 22 is inserted into the guide sliding grooves and can move relative to the limiting frame 21 under the action of external force. The limiting frame 21 can be fixed on the impurity removal pipeline 1. The limiting piece 23 can be in threaded connection with the limiting frame 21. By rotating the limiting piece 23, the limiting piece 23 can press or release the air adjusting door 22. The avoiding gap can match the shape of the air supplement window 13. By the movably arranged air adjusting door 22, the ventilation area of the air supplement window 13 can be known. The structure is simple and convenient to adjust.

[0047] As shown in Figure 1 and Figure 4As shown, in an embodiment, the air regulating door 22 comprises a shielding part 221 for shielding the air supplement window 13, and the limiting frame 21 is provided with a limiting stop edge 211 on one side close to the impurity drawing port 12, and in another embodiment, the air regulating door 22 comprises a shielding part 221 and a holding folded edge 222, the shielding part 221 is used for shielding the air supplement window 13, and the limiting frame 21 is provided with a limiting stop edge 211 on one side close to the impurity drawing port 12, and an end of the shielding part 221 away from the limiting stop edge 211 is connected with the holding folded edge 222, and the holding folded edge 222 is provided with a holding surface for holding. The impurities in the impurity removal pipeline 1 can be transported from front to back, the limiting stop edge 211 is located at the rear end of the limiting frame 21, and the air regulating door 22 can be stopped and limited, and the holding folded edge 222 is located at the rear end of the shielding part 221, and the external driving holds and drives the air regulating door 22.

[0048] In an embodiment, the dryer 200 is used for drying indica rice and japonica rice:

[0049]

[0050] According to the suspension airflow speed of the grain, the critical speed can be set as 7.5 m / s, most of the husks and light impurities can be drawn away, the impurity removal effect is best, and the grain is avoided from being drawn away.

[0051] Specifically, the number of the air supplement windows 13 is at least two. In an embodiment, the number of the air supplement windows 13 is one, and one air supplement window 13 can be arranged oppositely in the left-right direction, and in other embodiments, the air supplement windows 13 can be arranged on the upper and lower sides of the inclined pipe section 16. The number of the air supplement windows 13 can be arranged according to actual use requirements.

[0052] In the embodiment of the utility model, a plurality of filter screen holes are arranged at the air supplement window 13. The filter screen holes in the embodiment are through holes and are arranged in a matrix. By arranging the filter screen holes in a matrix at the air supplement window 13, the impurities can be prevented from escaping from the impurity removal pipeline 1, and the impurity removal effect of the impurity removal system 100 is ensured.

[0053] The utility model also provides a dryer 200, the dryer 200 includes the lifting system 210 and the above-mentioned impurity removal system 100, and the specific structure of the impurity removal system 100 is referred to the above-mentioned embodiment. Since the dryer 200 adopts all the technical schemes of the above-mentioned embodiments, it at least has all the beneficial effects brought by the technical schemes of the above-mentioned embodiments, which will not be repeated here.

[0054] As Figure 5As shown, the dryer 200 comprises a drying body 220, the upper conveying port of the lifting system 210 is connected to the top of the drying body 220 through an upper conveying pipeline 230, and the connecting point of the impurity removal pipeline 1 and the lifting system 210 is higher than the connecting point between the lifting system 210 and the upper conveying pipeline 230. The lifting system 210 in the embodiment is located at the front side of the drying body 220, and the lifting system 210 is vertically arranged, and the lifting system 210 can adopt an existing lifting structure, under the driving of the lifting system 210, the grain can be transported from bottom to top, the grain transported to the upper conveying pipeline 230 can flow back to the drying body 220, and the grain is subjected to cyclic drying through the drying equipment in the drying body 220, and the impurities can enter the impurity removal pipeline 1 under the action of the air of the impurity removal fan 3 and enter the ash storage room through the connecting pipeline 4; when the air flow speed in the impurity removal system 100 is too large due to the influence of the drying system air field, the opening degree of the air supplement window 13 can be adjusted through the adjusting assembly 2 to reduce the air flow speed at the critical speed position 14 until the grain is not sucked away by the impurity removal fan 3.

[0055] In the description of the present application, it should be understood that the terms "first", "second" are only for the purpose of description, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features limited by "first", "second" can explicitly or implicitly include at least one of the features. In the description of the present application, the meaning of "a plurality of" is at least two, such as two, three, etc., unless otherwise specifically limited.

[0056] In the present application, unless otherwise specifically defined and limited, the terms "mounting", "connection", "connection", "fixing" and the like should be understood in a broad sense, for example, it can be fixedly connected, or it can be detachably connected, or it can be integrated; it can be mechanically connected, or it can be electrically connected or in communication with each other; it can be directly connected, or it can be indirectly connected through an intermediate medium, it can be the communication or interaction relationship between two elements, unless otherwise specifically limited. For ordinary skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0057] In the description of the present specification, the description referring to the terms "one embodiment", "some embodiments", "an example", "a specific example", or "some examples" and the like means that the specific features, structures, materials or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present application. In the present specification, the illustrative description of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any appropriate manner in any one or more embodiments or examples. Furthermore, the person skilled in the art can combine and combine the different embodiments or examples described in the present specification and the features of the different embodiments or examples, without contradiction.

[0058] Although the embodiments of the present application have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present application, and the person skilled in the art can make changes, modifications, replacements and modifications to the above embodiments within the scope of the present application.

Claims

1. A purification system for a grain dryer, characterized in that, The impurity removal system (100) includes: The impurity removal pipe (1) has an impurity extraction port (12) and an impurity discharge port (11) at its two ends. The impurity extraction port (12) is used to connect to the lifting system (210) of the dryer (200), and the impurity discharge port (11) is used to connect to the ash storage room. The impurity removal pipe (1) is provided with a make-up air window (13), which is located between the impurity extraction port (12) and the impurity discharge port (11), and the make-up air window (13) is used to connect the inside of the impurity removal pipe (1) with the outside atmosphere. An adjustment component (2) is movably installed at the air supply window (13). The adjustment component (2) is used to increase or decrease the ventilation area of ​​the air supply window (13) and to form a critical velocity position (14) between the air supply window (13) and the discharge port (11), where V1 > V_suspend > V_critical > V2, where V1 is the airflow velocity between the critical velocity position (14) and the discharge port (11), V_suspend is the suspended airflow velocity of the grain dried by the dryer (200), V_critical is the airflow velocity at the critical velocity position (14), and V2 is the airflow velocity between the critical velocity position (14) and the discharge port (12).

2. The impurity removal system according to claim 1, characterized in that, The adjustment component (2) includes: A limiting frame (21) is installed on the impurity removal pipe (1), and a clearance notch matching the air supply window (13) is provided at the position corresponding to the air supply window (13); The air damper (22) is slidably connected to the limiting frame (21). The air damper (22) can slide relative to the limiting frame (21) and simultaneously cover the air supply window (13) and the clearance gap.

3. The impurity removal system according to claim 2, characterized in that, The adjustment component (2) further includes a limiting member (23) movably connected to the limiting frame (21), the limiting member (23) being used to limit the air damper (22) to the limiting frame (21).

4. The impurity removal system according to claim 2, characterized in that, The air regulating damper (22) includes a shielding part (221) for shielding the air supply window (13), and the limiting frame (21) is provided with a limiting baffle (211) for limiting the shielding part (221) on the side near the exhaust port (12).

5. The impurity removal system according to claim 4, characterized in that, The end of the shielding part (221) away from the limiting edge (211) is connected to a holding fold (222), and the holding fold (222) is provided with a holding surface for holding.

6. The impurity removal system according to any one of claims 1 to 5, characterized in that, The impurity removal pipe (1) includes: Straight pipe section (15), the outlet of which is connected to the ash storage room via connecting pipe (4); An inclined pipe section (16) is used to connect the inlet of the lifting system (210) and the straight pipe section (15). The inclined pipe section (16) is inclined upward from the lifting system (210) towards the straight pipe section (15). The air supply window (13) is opened in the inclined pipe section (16).

7. The impurity removal system according to claim 6, characterized in that, The inclination angle of the inclined tube section (16) is a gravity flow angle that allows the grain to flow back from top to bottom.

8. The impurity removal system according to any one of claims 1 to 5, characterized in that, The difference between V_suspended and V_critical is between 0.1 m / s and 0.2 m / s; And / or, The air supply window (13) is provided with multiple filter mesh holes; And / or, The number of the air supply windows (13) is at least two.

9. A dryer (200), characterized in that, The dryer (200) includes a lifting system (210) and a cleaning system (100) as described in any one of claims 1 to 8.

10. The dryer according to claim 9, characterized in that, The dryer (200) includes a drying body (220), and the upper conveying port of the lifting system (210) is connected to the top of the drying body (220) through an upper conveying pipe (230). The connection point between the impurity removal pipe (1) and the lifting system (210) is higher than the connection point between the lifting system (210) and the upper conveying pipe (230).

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