Impurity removal system and dryer

Abstract

The utility model provides an impurity removal system, dryer and air regulation mechanism, including the air volume adjustable impurity removal fan, the impurity outlet is used for connecting the ash storage room through the impurity removal fan, the impurity removal fan is used for forming the critical speed position between the air supplement window and the impurity outlet, V1 > V suspension > V temporary > V2, V1 is the air flow speed between the critical speed position and the impurity outlet, V suspension > V temporary > V2, and V suspension > V temporary > V2 is the air flow speed between the critical speed position and the impurity outlet. 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 impurity removal fan capable of adjusting the air volume is matched, so that the air flow 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 grain drying technical field especially relates to a kind of impurity removal system and dryer. BACKGROUND

[0002] Grain dryer is the core equipment of drying center. With the attention of people to grain safety and quality, promote the rapid development of dryer industry, dryer is also developing towards automation, operation convenience, high performance. In order to improve the quality of grain after drying, low temperature batch type circulating dryer is widely used, and currently users have higher requirements for the performance of the dryer, and many manufacturers will separately configure a set of impurity removal system.

[0003] The impurity removal system of dryer is mainly to remove impurities through air selection principle, that is, according to the different suspension airflow velocity of grain and impurities, the grain and impurities are separated by adjusting the air speed; The impurity removal system is usually 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 main purpose of the utility model is to provide an impurity removal system and dryer, which aims to solve the technical problem that the existing impurity removal system will suck out the grain and impurities together.

[0005] In order to achieve the above purpose, the utility model provides an impurity removal system for a dryer for drying grain, which comprises: an impurity removal pipeline, two ends of which are respectively provided with an impurity suction port and an impurity outlet, the impurity suction port is connected with the lifting system of the dryer, a wind supplement window is formed in the impurity removal pipeline, the wind supplement window is located between the impurity suction port and the impurity outlet, and the wind supplement window is used to communicate the inside of the impurity removal pipeline with the outside atmosphere; An impurity removal fan with adjustable air volume is arranged, the impurity outlet is connected with a dust storage room through the impurity removal fan, the impurity removal fan is used to form a critical speed position between the wind 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 impurity removal pipeline comprises: a straight pipe section, the outlet of the straight pipe section is connected with the impurity removal fan through a connecting pipeline; An inclined pipe section is used to connect the lifting system and the inlet of the straight pipe section, the inclined pipe section is inclined upward from the lifting system to the straight pipe section, and the wind supplement window is formed in the inclined pipe section.

[0007] In the embodiment of the utility model, the inclined angle of the inclined pipe section is the self-flowing angle that can make the grain backflow from top to bottom.

[0008] In the embodiment of the utility model, the one end of the straight pipe section away from the inclined pipe section is provided with the interface round pipe that can be detachably connected with the connecting pipeline, and the cross-sectional dimension of the interface round pipe is smaller than the cross-sectional dimension of the straight pipe section.

[0009] In the embodiment of the utility model, the one end of the inclined pipe section away from the straight pipe section is connected with the flange plate, the cross-sectional dimension of the flange plate is greater than the cross-sectional dimension of the inclined pipe section and is used for being connected with the lifting system.

[0010] In the embodiment of the utility model, the difference between V suspension and V temporary is between 0.1 m / s to 0.2 m / s.

[0011] In the embodiment of the utility model, the number of the air supplement window is at least two.

[0012] In the embodiment of the utility model, a plurality of filter mesh holes are arranged at the air supplement window.

[0013] The utility model further provides a dryer, the dryer includes a lifting system and the impurity removal system as described above.

[0014] In the embodiment of the utility model, the dryer includes a drying body, the upper conveying port 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 impurity removing system is used to remove the chaff and light impurities in the grain, the grain with impurities in the lifting system can be lifted upward to a position close to the suction port of the impurity removing pipeline, and the impurities in the grain can enter the impurity removing pipeline under the action of the wind of the impurity removing fan, when the system wind field of the dryer changes, the size of the air volume of the impurity removing fan can be adjusted, so that a critical speed position is formed between the air supplementing window and the impurity outlet, and the speed of each part of the impurity removing pipeline along the direction of conveying impurities forms 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 by the impurity removing fan, so that the effect of removing impurities without taking away the grain is achieved, and it is ensured that the impurity removing system can cope with the complex working conditions of the dryer. The impurities can enter the ash storage room through the impurity removing pipeline and the impurity removing fan in sequence, and the sucked impurities are stored in the ash storage room. In the embodiment, the air supplementing window is arranged on the impurity removing pipeline to make V1>V2, and the air volume of the impurity removing fan is adjusted to make the airflow speed relationship of V1>Vsuspension>Vcritical>V2 along the direction of conveying impurities on the impurity removing pipeline, so as to maximize the impurity removing 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 removing system according to an embodiment of the present application;

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

[0021] Figure 3 is a structural schematic view of the impurity removing pipeline in the impurity removing 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 removing 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] Label Name Label Name

[0026] 100 Impurity Removal System 211 Limiting Edge

[0027] 1. Impurity removal pipe; 22. Air damper.

[0028] 11. Exhaust port 221. Covering section

[0029] 12 Exit miscellaneous parts 222 Hold the folded edge

[0030] 13 Air intake window 23 Limiting component

[0031] 14 Critical speed position 3 Impurity removal fan

[0032] 15 Straight pipe section 4 Connecting pipe

[0033] 16 Inclined Tube Section 200 Dryer

[0034] 17 Interface round pipe 210 Lifting system

[0035] 18 Flange plate 220 Drying body

[0036] 2. Conveying pipe on regulating component 230

[0037] 21 Limiting frame Detailed Implementation

[0038] The specific embodiments of this utility model 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 this utility model.

[0039] The impurity removal system according to the present invention is described below with reference to the accompanying drawings.

[0040] like Figures 1 to 4 As shown in the embodiment of this utility model, the impurity removal system 100 is used for drying grain in a dryer 200. The impurity removal system 100 includes an impurity removal pipe 1 and an adjustable impurity removal fan 3. The impurity removal pipe 1 has an extraction port 12 and an outlet 11 at its two ends. The extraction port 12 is used to connect to the lifting system 210 of the dryer 200. An air supply window 13 is provided on the impurity removal pipe 1, located between the extraction port 12 and the outlet 11, and the air supply window 13 is used to connect the impurity removal pipe 1 with the inside of the dryer 200. Outside atmosphere; the outlet 11 is used to connect to the ash storage room through the impurity removal fan 3. The impurity removal fan 3 is used to form a critical velocity position 14 between the air supply window 13 and the outlet 11, and V1 > Vsuspension > Vcritical > V2, where V1 is the airflow velocity between the critical velocity position 14 and the outlet 11, Vsuspension is the suspended airflow velocity of the grain dried by the dryer 200, Vcritical is the airflow velocity at the critical velocity position 14, and V2 is the airflow velocity between the critical velocity position 14 and the extraction port 12.

[0041] It can be understood that the one end of the dedusting pipeline 1 is provided with an interface pipe 17, and the dedusting outlet 11 is arranged on the interface pipe 17. The cross-sectional dimension of the interface pipe 17 is smaller than that of the dedusting pipeline 1, so that the dedusting pipeline 1 can be conveniently connected to the dedusting fan 3 through the connecting pipeline 4. The lifting system 210 is used to transport the grain in the vertical direction. In order to facilitate the connection between the dedusting pipeline 1 and the lifting system 210, the other end of the dedusting pipeline 1 is provided with a flange plate 18 connected to the lifting system 210. The cross-sectional dimension of the flange plate 18 is larger than that of the dedusting pipeline 1. The flange plate 18 can be provided with a plurality of connecting holes arranged at intervals in the circumferential direction of the flange plate 18, so that the dedusting pipeline 1 can be conveniently connected to the pipeline of the lifting system 210 through the flange plate 18. In one embodiment, the difference between Vtemp and Vfloat is between 0.1 m / s and 0.2 m / s.

[0042] Specifically, the one end of the straight pipe section 15 away from the inclined pipe section 16 is provided with an interface pipe 17. The cross-sectional dimension of the interface pipe 17 is smaller than that of the straight pipe section 15. The interface pipe 17 is arranged at the middle position of the straight pipe section 15, so that the connecting pipeline 4 can be conveniently connected through the interface pipe 17. The one end of the inclined pipe section 16 away from the straight pipe section 15 is connected to a flange plate 18. The cross-sectional dimension of the flange plate 18 is larger than that of the inclined pipe section 16 and is used to be detachably connected to the pipeline of the lifting system 210. In this embodiment, the flange plate 18 can be provided with a plurality of connecting holes, so that the pipeline of the lifting system 210 can be detachably connected through a plurality of connecting members such as bolts.

[0043] 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 extraction 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 wind of the impurity removal fan 3. When the system wind field of the dryer 200 changes, the air volume of the impurity removal fan 3 can be adjusted, so that the critical speed position 14 is formed between the air supplement window 13 and the impurity outlet 11, and the speed of each part of the impurity removal pipeline 1 in the direction of conveying impurities forms the relationship of V1>Vsuspension>Vcritical>V2, and Vsuspension is set to be close to Vcritical. Under this air flow 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 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. The impurities can enter the ash storage room through the impurity removal pipeline 1 and the impurity removal fan 3 in turn, and the extracted impurities are stored 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 impurity removal fan 3 is adjusted to make the air flow speed relationship of V1>Vsuspension>Vcritical>V2 formed along the direction of conveying impurities on the impurity removal pipeline 1, so as to maximize the impurity removal effect and avoid taking away the grain.

[0044] 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.

[0045] 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.

[0046] It should be noted that the air adjusting mechanism further comprises an adjusting assembly 2 movably installed at the air supplementing window 13 and used to increase or decrease the ventilation area of the air supplementing window 13, and 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 that of the upper end surface of the straight pipe section 15, and the critical speed position 14 is a vertical position from the tail of the upper end surface of the straight pipe section 15.

[0047] When the impurity removing 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 supplementing window 13 to adjust the size of the air opening of the impurity removing pipeline 1 connected to the external atmosphere, to ensure the relationship of V1>Vsuspension>Vcritical>V2, and Vsuspensionis set to be close to Vcritical. Under the 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 by the impurity removing fan 3, thereby achieving the effect of removing impurities without taking away the grain, and ensuring that the impurity removing system 100 can cope with the complex working conditions of the drying machine 200. In the case that the impurity removing fan 3 cannot achieve accurate impurity removal due to limited air volume adjustment, the size of the air supplementing amount at the air supplementing window 13 can be adjusted by moving the adjusting assembly 2, to ensure that the impurity removing system 100 can always achieve accurate dust removal.

[0048] As shown in Figure 1 the adjusting assembly 2 comprises a limiting frame 21, an air adjusting door 22 and a limiting piece 23. The limiting frame 21 is installed on the impurity removing pipeline 1 and has an avoiding gap matching the shape of the air supplementing window 13 at the position corresponding to the air supplementing 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 supplementing window 13 and the avoiding gap. The limiting frame 21 is hollow and has the avoiding gap in the middle, which can facilitate the adjustment of the ventilation area of the air supplementing window 13 by the air adjusting door 22. 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 removing pipeline 1, the limiting frame 21 has the avoiding gap in the middle, the upper and lower edges of the limiting frame 21 can be provided with guide sliding grooves, 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 removing pipeline 1, the limiting piece 23 can be in threaded connection with the limiting frame 21, and the limiting piece 23 can be tightened or loosened on the air adjusting door 22 by rotating the limiting piece 23. The shape of the avoiding gap can match the air supplementing window 13, and the ventilation area of the air supplementing window 13 can be understood by the movably arranged air adjusting door 22, which is simple in structure and convenient to adjust.

[0049] As shown in Figure 1 and Figure 4As shown, the air adjusting door 22 comprises a shielding part 221 for shielding the air supplement window 13 and a holding folded edge 222, the limiting frame 21 is provided with a limiting stop edge 211 for limiting the shielding part 221 on one side close to the impurity drawing opening 12, and the shielding part 221 is connected with the holding folded edge 222 at an end away from the limiting stop edge 211, and the holding folded edge 222 is provided with a holding surface for holding.

[0050] In an embodiment, the dryer 200 is used for drying indica rice and japonica rice:

[0051]

[0052] According to the suspension airflow velocity of the grain, the critical velocity can be set as 7.5 m / s, most of the chaff and light impurities can be drawn away, the impurity removal effect is best, and the grain is avoided from being drawn away.

[0053] 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 the 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.

[0054] In the embodiment of the utility model, a plurality of filter mesh holes are arranged at the air supplement window 13. The filter mesh holes in the embodiment are through holes and are arranged in a matrix, by arranging the filter mesh holes in a matrix at the air supplement window 13, the impurities can be avoided from escaping from the impurity removal pipeline 1, and the impurity removal effect of the impurity removal system 100 is ensured.

[0055] 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, at least has all the beneficial effects brought by the technical schemes of the above-mentioned embodiments, which will not be repeated here.

[0056] 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.

[0057] 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.

[0058] 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.

[0059] 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.

[0060] 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 system for removing impurities in a dryer for drying grains, characterized in that, The impurity removal system (100) comprises: An impurity removal pipeline (1) having an impurity extraction port (12) and an impurity outlet port (11) at two ends, the impurity extraction port (12) being used to be connected with a lifting system (210) of the dryer (200), the impurity removal pipeline (1) being provided with an air supplement window (13), the air supplement window (13) being located between the impurity extraction port (12) and the impurity outlet port (11), and the air supplement window (13) being used to communicate the inside of the impurity removal pipeline (1) with the outside atmosphere; An impurity removal air blower (3) with adjustable air volume, the impurity outlet port (11) being used to be connected with an ash storage room through the impurity removal air blower (3), the impurity removal air blower (3) being used to form a critical speed position (14) between the air supplement window (13) and the impurity outlet port (11), and V1>Vsuspension>Vcritical>V2, wherein V1 is the air flow speed between the critical speed position (14) and the impurity outlet port (11), Vsuspension is the suspended air flow speed of the grain dried by the dryer (200), Vcritical is the air flow speed at the critical speed position (14), and V2 is the air flow speed between the critical speed position (14) and the impurity extraction port (12).

2. The impurity removal system of claim 1, wherein, The impurity removal pipeline (1) comprises: A straight pipeline section (15), an outlet of the straight pipeline section (15) being connected with the impurity removal air blower (3) through a connecting pipeline (4); An inclined pipeline section (16) used to be connected with the lifting system (210) and an inlet of the straight pipeline section (15), the inclined pipeline section (16) being upwardly inclined from the lifting system (210) to the straight pipeline section (15), and the air supplement window (13) being provided in the inclined pipeline section (16).

3. The impurity removal system of claim 2, wherein, An inclination angle of the inclined pipeline section (16) is a self-flowing angle enabling the grain to flow back from top to bottom.

4. The impurity removal system of claim 2, wherein, An end of the straight pipeline section (15) away from the inclined pipeline section (16) is provided with an interface circular pipe (17) detachably connected with the connecting pipeline (4), a cross-sectional dimension of the interface circular pipe (17) being smaller than a cross-sectional dimension of the straight pipeline section (15).

5. The impurity removal system of claim 2, wherein, An end of the inclined pipeline section (16) away from the straight pipeline section (15) is connected with a flange plate (18), a cross-sectional dimension of the flange plate (18) being larger than a cross-sectional dimension of the inclined pipeline section (16) and being used to be connected with the lifting system (210).

6. The impurity removal system of any one of claims 1 to 5, wherein, A difference between Vsuspension and Vcritical is between 0.1 m / s and 0.2 m / s.

7. The impurity removal system of any one of claims 1 to 5, wherein, A number of the air supplement windows (13) is at least two.

8. The impurity removal system of any one of claims 1 to 5, wherein, A plurality of filter mesh holes are provided in the air supplement window (13).

9. A dryer (200) characterized by, The dryer (200) comprises the lifting system (210) and the impurity removal system (100) according to any one of claims 1 to 8.

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

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