A multi-stage natural wind waterfall type fine sand drying device

Abstract

The invention discloses a multi-stage natural wind waterfall type fine sand drying device, comprising a horizontal wind tunnel dehumidification system, a falling slope trough sand waterfall air drying system, and a vertical sand waterfall drying system which are connected in sequence. The device adopts the evaporation principle, and can vaporize and air-dry the moisture on the surface of the material through air flow, so as to achieve a rapid drying effect, has strong applicability, low energy consumption, and is a pure physical change, without the need for additional heat source energy consumption; the device changes the horizontal flipping loosening method adopted by traditional wet sand drying machinery, and utilizes a large-angle slope trough to make the material roll and flip from top to bottom in a slope trough at a certain angle by its own weight, which is more efficient than the horizontal flipping method, has a better loosening effect, and has better air fluidity. The device adopts a three-stage falling waterfall type cloth, so that the sand material can be dried by wind in all directions, and vertically segmented air supply and exhaust can effectively isolate air with different humidity and reduce the influence of wet air mixing on the drying degree of the sand material.

Description

Technical Field

[0001] The invention relates to the field of fine sand drying equipment, and in particular to a multi-stage natural wind waterfall type fine sand drying device. Background Art

[0002] After dehydration, the water content of washed fine sand is about 8-12%, while the requirements of JG / T291-2011 for fine aggregate are: it should meet the requirements of Class II medium sand in GB / T14684, and the water content should be less than 0.5%. In order to reduce the drying cost of premixed mortar sand, premixed mortar companies require that the water content of sand provided by sand and gravel companies should be ≤ 1%. In order to meet the stone powder content control required by premixed mortar companies, sand and gravel companies often use water washing technology, so sand and gravel companies need to dry the washed fine sand before delivery.

[0003] Most of the existing sand drying machines use external heat source drum dryers, which have large processing capacity and can realize large-scale production. However, because they need a heat source, whether it is electric heating or gas heating, its energy consumption is relatively large. At the same time, part of the sand is baked at medium temperature during the heating process, which is prone to dust pollution. Special dust removal equipment is required to collect dust during the processing process, and the dust removal equipment also consumes a certain amount of energy. In order to reduce energy consumption and achieve green drying of sand, room temperature air drying becomes the preferred process. However, because the sand has a high moisture content and is in a clumping structure, room temperature air drying is difficult to achieve the expected effect. If horizontal natural air drying is used, the facility occupies a large area and needs to be repeatedly broken up, with high energy consumption and poor air drying effect. Summary of the invention

[0004] In order to solve the above technical problems, the technical solution provided by the present invention is: a multi-stage natural wind waterfall fine sand drying device, comprising a horizontal wind tunnel dehumidification system, a drop-type slope trough sand waterfall air drying system, and a vertical sand waterfall drying system connected in sequence;

[0005] The horizontal wind tunnel dehumidification system includes a wind tunnel box, a material feeding bin, a feeder, a three-layer conveyor belt assembly, a material collection bin, an air supply system 1, and an air induced air system 1. The material feeding bin is arranged at the top of the wind tunnel box away from one end of the drop-type slope trough sand waterfall air drying system, and extends into the wind tunnel box and is connected to the feeder corresponding to one end of the three-layer conveyor belt assembly. The other end of the three-layer conveyor belt assembly extends out of the wind tunnel box and extends into the material collection bin. The bottom outlet of the material collection bin corresponds to the inlet end of the drop-type slope trough sand waterfall air drying system. The air supply system 1 is arranged at the bottom of the wind tunnel box, and the air induced air system 1 is arranged at the top of the wind tunnel box.

[0006] The drop-type slope trough sand waterfall air drying system includes a material conveyor belt, a collection hopper, a distributor, a louver-type slope trough assembly, a vibrator, a second air supply system, and a second air induced system. The material conveyor belt and the louver-type slope trough assembly are both inclined and connected in an "eight" shape. The lowest end of the material conveyor belt corresponds to the material collection bin, and the highest end extends into the highest end of the louver-type slope trough assembly and is connected to the distributor. The lowest end of the louver-type slope trough assembly corresponds to the inlet end of the vertical sand waterfall drying system. The vibrator is arranged on the louver-type slope trough assembly, the second air supply system is arranged at the lower part of the louver-type slope trough assembly, and the second air induced system is arranged at the top of the louver-type slope trough assembly.

[0007] The vertical sand waterfall drying system includes a spiral feeder, a sealed distributor, a vertical air drying box, a dry material collector, an air supply system three, an exhaust system, and a wind cyclone. The spiral feeder is inclined, and its lowest end corresponds to the outlet of the louver-type slope trough component, and the highest end is connected to the top of the vertical air drying box through a sealed distributor and a dry material collector. The air supply system three is connected to the vertical air drying box, and the top of the vertical air drying box is connected to the wind cyclone through the exhaust system. The bottom of the wind cyclone is connected to a dust removal bag, and the top of the wind cyclone is connected to a bag dust collector for gas discharge.

[0008] As an improvement, the three-layer conveyor belt assembly includes an upper conveyor belt, a middle conveyor belt, and a bottom conveyor belt. Adjacent conveyor belts are independently and oppositely arranged. The bottom conveyor belt is inclined, and the end thereof extending into the material collection bin is the higher end.

[0009] As an improvement, the bottom of the wind tunnel box is provided with a sloped bottom surface, the sloped bottom surface has one end close to the drop-type slope trough sand waterfall air-drying system as the highest end, and the other end as the lowest end, and a deep water-sealed floor drain pipe is provided at the lowest end for draining water outwards.

[0010] As an improvement, the bottom of the side wall of the wind tunnel box is evenly provided with several long air inlets along its length direction, the air supply system includes an air fan and an air supply duct, the air fan is connected with the long air inlets through the air supply duct to evenly transport wind into the wind tunnel box, and the top of the wind tunnel box is evenly provided with several horizontal air ducts, the horizontal air ducts are connected with the air fan through the air duct, and the other end of the air fan is connected to the exhaust pipe.

[0011] As an improvement, the louvered slope trough assembly includes a louvered slope trough and a slope trough closing cover arranged outside the louvered slope trough, the highest end of the material conveyor belt extends into the slope trough closing cover, and the bottom of the slope of the slope trough closing cover is provided with a louvered air supply outlet corresponding to the air supply system 2.

[0012] As an improvement, the second air supply system includes a second air supply fan and a second air supply duct. The second air supply fan is connected to the louvered air supply outlet at the bottom of the slope groove of the slope groove closed cover through the second air supply duct. An exhaust outlet is provided at the top of the slope groove closed cover, and the exhaust duct of the exhaust outlet channel is connected to the second induced draft fan.

[0013] As an improvement, the number of the louver air outlets is multiple and they are evenly spaced along the bottom of the slope groove of the slope groove closing cover.

[0014] As an improvement, there are multiple drop-type slope trough sand waterfall air-drying systems, which are arranged end to end in sequence.

[0015] As an improvement, the vertical air drying box is provided with three layers of air drying boxes from top to bottom, and each layer of air drying boxes is provided with an air supply outlet corresponding to the air supply system three. The air supply system three includes air supply fan three and air supply duct three. The air supply fan three is connected to the air supply outlet of the air drying box through air supply duct three. An induced draft duct two is provided on the top of each layer of the air drying box, and the induced draft duct two is discharged into the wind cyclone through the induced draft fan three.

[0016] As an improvement, a cone nozzle is provided at the connection between the bottom of the wind cyclone and the dust removal bag.

[0017] After adopting the above structure, the present invention has the following advantages: the device adopts the evaporation principle, and the moisture on the surface of the material can be vaporized and air-dried through air flow to achieve a rapid drying effect, with strong applicability, low energy consumption, pure physical change, and no need for additional heat source energy consumption; the device changes the horizontal flipping loosening method adopted by the traditional wet sand drying machinery, and uses a large-angle slope groove to make the material roll and flip from top to bottom in a slope groove at a certain angle by its own weight, which is more efficient than the horizontal flipping method, has a better loosening effect, and better air fluidity; the device innovatively uses a louver-type slope groove flat-bottom air supply port, and the material conveying and air drying are integrated; the slope grooves of the device all adopt a low-flat plate with a louver structure, so that the material movement is not hindered, the undulating bottom plate structure increases the material flipping frequency, and the bottom air supply can also blow the material away, maintain a stable sand material falling speed, so that the material can be ventilated uniformly throughout the whole process, accelerate the evaporation of water, and achieve rapid drying; the device adopts a three-level waterfall cloth, so that the sand material can be air-dried in all directions, and the vertical segmented air supply and exhaust can effectively isolate the air with different humidity and reduce the influence of wet air mixing on the drying degree of the sand material. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a structural schematic diagram of a multi-stage natural wind waterfall type fine sand drying device of the present invention.

[0019] Figure 2 It is a structural schematic diagram of a horizontal wind tunnel dehumidification system in a multi-stage natural wind waterfall type fine sand drying device of the present invention.

[0020] Figure 3It is a structural schematic diagram of a falling slope trough sand waterfall air drying system in a multi-stage natural wind waterfall fine sand drying device of the present invention.

[0021] Figure 4 It is a structural schematic diagram of a louver-type slope trough in a multi-stage natural wind waterfall type fine sand drying device of the present invention.

[0022] Figure 5 It is a structural schematic diagram of a vertical sand waterfall drying system in a multi-stage natural wind waterfall type fine sand drying device of the present invention.

[0023] As shown in the figure: 1. Horizontal wind tunnel dehumidification system, 1.1. Wind tunnel box, 1.1a. Slope bottom surface, 1.2. Material feeding bin, 1.3. Feeder, 1.4. Three-layer conveyor belt assembly, 1.4a. Upper conveyor belt, 1.4b. Middle conveyor belt, 1.4c. Bottom conveyor belt, 1.5. Material collection bin, 1.6. Induced air system 1, 1.6a. Induced air duct, 1.6b. Induced air fan 1, 1.6c. Exhaust pipe, 1.7. Deep water-sealed floor drain pipe, 1.8. Long strip air inlet, 2. Drop-type slope trough sand waterfall air drying system, 2.1. Material conveyor belt, 2.2. Collection hopper, 2.3. Cloth ,2.4、louvered slope trough assembly,2.4a、louvered slope trough,2.4b、slope trough closure cover,2.5、air supply system 2,2.5a、air supply fan 2,2.5b、air supply duct 2,2.6、inducing air system 2,3、vertical sand waterfall drying system,3.1、screw feeder,3.2、sealed distributor,3.3、vertical air drying box,3.4、dry material collector,3.5、air supply system 3,3.5a、fan 3,3.5b、air supply duct 3,3.6、exhaust system,3.6a、inducing air duct 2,3.6b、inducing air fan 3,3.7、wind cyclone,3.8、dust bag,3.9、bag dust collector。 DETAILED DESCRIPTION

[0024] In conjunction with the attached drawings, a multi-stage natural wind waterfall type fine sand drying device is characterized by: comprising a horizontal wind tunnel dehumidification system 1, a drop-type slope trough sand waterfall air drying system 2, and a vertical sand waterfall drying system 3 connected in sequence;

[0025] The horizontal wind tunnel dehumidification system 1 comprises a wind tunnel box 1.1, a material feeding bin 1.2, a feeder 1.3, a three-layer conveyor belt assembly 1.4, a material collection bin 1.5, an air supply system 1, and an air induced air system 1.6. The material feeding bin 1.2 is arranged at the top of the wind tunnel box 1.1 away from one end of the drop-type slope trough sand waterfall air drying system 2, and extends into the wind tunnel box 1.1 and is connected to the feeder 1.3 corresponding to one end of the three-layer conveyor belt assembly 1.4. The other end of the three-layer conveyor belt assembly 1.4 extends out of the wind tunnel box 1.1 and extends into the material collection bin 1.5. The bottom outlet of the material collection bin 1.5 corresponds to the inlet end of the drop-type slope trough sand waterfall air drying system 2. The air supply system 1 is arranged at the bottom of the wind tunnel box 1.1, and the air induced air system 1.6 is arranged at the top of the wind tunnel box 1.1;

[0026] The drop-type slope trough sand waterfall air drying system 2 includes a material conveyor belt 2.1, a collection hopper 2.2, a distributor 2.3, a louver-type slope trough component 2.4, a vibrator, an air supply system 2.5, and an air induced system 2.6. The material conveyor belt 2.1 and the louver-type slope trough component 2.4 are both inclined and connected in an "eight" shape. The lowest end of the material conveyor belt 2.1 corresponds to the material collection bin 1.5, and the highest end extends into the highest end of the louver-type slope trough component 2.4 and is connected to the distributor 2.2. The lowest end of the louver-type slope trough component 2.4 corresponds to the inlet end of the vertical sand waterfall drying system 3. The vibrator is arranged on the louver-type slope trough component 2.4, the air supply system 2.5 is arranged at the lower part of the louver-type slope trough component 2.4, and the air induced system 2.6 is arranged at the top of the louver-type slope trough component 2.4.

[0027] The vertical sand waterfall drying system 3 includes a spiral feeder 3.1, a sealed distributor 3.2, a vertical air drying box 3.3, a dry material collector 3.4, an air supply system 3.5, an exhaust system 3.6, and a wind cyclone 3.7. The spiral feeder 3.1 is inclined, and its lowest end corresponds to the outlet of the louver-type slope trough component 2.4, and the highest end is connected to the top of the vertical air drying box 3.3 through the sealed distributor 3.2 and the dry material collector 3.4. The air supply system 3.5 is connected to the vertical air drying box 3.3, and the top of the vertical air drying box 3.3 is connected to the wind cyclone 3.7 through the exhaust system 3.6. The bottom of the wind cyclone 3.7 is connected to the dust bag 3.8, and the top of the wind cyclone 3.7 is connected to the bag dust collector 3.9 for gas discharge.

[0028] As a preferred implementation scheme of this embodiment, the three-layer conveyor belt assembly 1.4 includes an upper conveyor belt 1.4a, a middle conveyor belt 1.4b, and a bottom conveyor belt 1.4c. Adjacent conveyor belts are independently and reversely arranged. The bottom conveyor belt 1.4c is inclined, and the end thereof extending into the material collection bin 1.5 is the higher end.

[0029] As a preferred implementation scheme of this embodiment, a sloped bottom surface 1.1a is provided at the bottom of the wind tunnel box 1.1, and one end of the sloped bottom surface 1.1a close to the drop-type slope trough sand waterfall air-drying system 2 is the highest end, and the other end is the lowest end. A deep water-sealed floor drain pipe 1.7 is provided at the lowest end to drain water outward.

[0030] As a preferred implementation scheme of this embodiment, a plurality of long air inlets 1.8 are evenly arranged at the bottom of the side wall of the wind tunnel box 1.1 along its length direction, and the air supply system 1 includes an air supply fan 1 and an air supply duct 1. The air supply fan 1 is connected with the long air inlet 1.8 through the air supply duct 1 to evenly transport wind to the wind tunnel box 1.1, and a plurality of horizontal air ducts are evenly arranged on the top of the wind tunnel box 1.1, and the horizontal air ducts are connected with the draft fan 1.6b through the draft duct 1.6a, and the other end of the draft fan 1.6b is connected to the exhaust pipe 1.6c.

[0031] As a preferred implementation scheme of this embodiment, the louvered slope groove assembly 2.4 includes a louvered slope groove 2.4a and a slope groove closing cover 2.4b arranged outside the louvered slope groove 2.4a, the highest end of the material conveyor belt 2.1 extends into the slope groove closing cover 2.4b, and the bottom of the slope groove of the slope groove closing cover 2.4b is provided with a louvered air supply port corresponding to the air supply system 2 2.5.

[0032] As a preferred implementation scheme of this embodiment, the air supply system 2.5 includes an air supply fan 2.5a and an air supply duct 2.5b. The air supply fan 2.5a is connected to the louver air supply port at the bottom of the slope groove of the slope groove closure cover 2.4b through the air supply duct 2.5b. The top of the slope groove closure cover 2.4b is provided with an exhaust port, and the exhaust port channel exhaust duct is connected to the induced draft fan 2.

[0033] As a preferred implementation scheme of this embodiment, there are multiple louver air supply outlets, and they are evenly spaced along the bottom of the slope groove of the slope groove closing cover 2.4b.

[0034] As a preferred implementation scheme of this embodiment, there are multiple drop-type slope trough sand waterfall air-drying systems 2, which are arranged in sequence end to end.

[0035] As a preferred implementation scheme of this embodiment, the vertical air drying box 3.3 is provided with three layers of air drying boxes from top to bottom, and each layer of the air drying box is provided with an air supply outlet corresponding to the air supply system three 3.5, and the air supply system three 3.5 includes an air supply fan three 3.5a and an air supply duct three 3.5b. The air supply fan three 3.5a is connected to the air supply outlet of the air drying box through the air supply duct three 3.5b, and an induced draft duct two 3.6a is provided on the top of each layer of the air drying box, and the induced draft duct two 3.6a is discharged into the wind cyclone 3.7 through the induced draft fan three 3.6b.

[0036] As a preferred implementation of this embodiment, a cone nozzle is provided at the connection between the bottom of the wind cyclone 3.7 and the dust removal bag 3.8.

[0037] The device utilizes the flow of air at room temperature to quickly evaporate the moisture on the surface of the wet sand that is turned back and forth to achieve sand drying; the device does not involve thermal energy, but only relies on the flow of air to quickly vaporize the moisture on the surface of the wet sand, which is a physical change and does not generate new pollution sources.

[0038] In the horizontal wind tunnel dehumidification system, the wind tunnel box is a rectangular closed structure with a height-to-width ratio of 4:1. The slope of the bottom of the tunnel has a slope of 1:2.5% to collect material water. The water is discharged outwards through a deep water-sealed floor drain pipe at the lowest point in the tunnel. The bottom conveyor belt is equipped with a material collection bin and a feeder. The material feeding bin and the material collection bin are used to store sand to form a fully enclosed space. The bottom of the side wall of one side of the wind tunnel box is provided with a long strip air inlet in the longitudinal direction. The air supply system 1 connects the long strip air inlet through the air duct to evenly transport the wind into the wind tunnel box. The top of the wind tunnel box is provided with a horizontal induced air outlet, which is connected to the induced air duct to collect it to the induced draft fan 1. The other end of the induced draft fan 1 is connected to the exhaust pipe. By synchronously starting the feed fan and the induced draft fan, the wind can flow quickly and evenly to complete the initial dehumidification work.

[0039] In the drop-type slope sand waterfall air drying system, the material conveyor belt transports the preliminarily dehumidified material to the high-position collecting hopper, and then the distributor evenly distributes the material to the fully enclosed large-angle louver slope trough component, relying on the material gravity to make the material roll from top to bottom along the louver slope trough. The vibrator is installed on the louver slope trough, and the material rolling speed is controlled by adjusting the vibration frequency and amplitude; the air supply system 2 is connected to the louver air supply port at the bottom of the slope trough through multiple air supply pipes 2, so that the air is evenly fed in through the louver port to dry the material sliding and rolling on it. There are multiple exhaust ports on the top of the slope trough closed cover, which are connected and transported to the induced draft fan by the exhaust pipe. The induced draft fan accelerates the wet air passing through the material and uniformly discharges it to the exhaust pipe to complete a drop-type sand waterfall drying process. Due to the normal temperature air drying, it is difficult for the sand material to achieve the dehumidification effect after passing through the slope sand waterfall once, so it is necessary to repeat the process many times, that is, 3 to 5 drop-type slope sand waterfalls are used to make the material reach a drying effect with a moisture content of ≤2%;

[0040] In the vertical sand waterfall drying system, after the materials are dried by the falling slope sand waterfall drying system and meet the specified requirements, the materials enter the screw feeder and are transported to the high-position sealed distributor in a sealed state. The semi-dried materials are sprinkled into the vertical drying box in a waterfall shape. The vertical drying box is divided into three layers for blowing, and the induced draft fan at the top discharges the wet air of the sand dried in the three layers of drying boxes into a unified air duct to the wind cyclone. The lower cone nozzle of the wind cyclone is connected to the dust removal bag, and the exhaust pipe on the top of the wind cyclone is discharged to the outside after passing through the bag dust collector.

[0041] The sand material passing through the above-mentioned air drying system is required to have a moisture content of less than 1%. If it does not meet the moisture content requirement, it is necessary to adjust the amount of wet sand fed into the material, adjust the angle of the slope of the sand waterfall, reduce the frequency and amplitude of the vibration device, extend the material ventilation time, and adjust the air supply and exhaust volume of the vertical air drying box to ensure that the moisture content of the material meets the standard.

[0042] The present invention and its embodiments are described above, and such description is not restrictive. The drawings show only one embodiment of the present invention, and the actual structure is not limited thereto. In short, if ordinary technicians in the field are inspired by it, without departing from the purpose of the invention, they can design a structure and embodiment similar to the technical solution without creativity, which should belong to the protection scope of the present invention.

Claims

1. A multi-stage natural wind waterfall type fine sand drying device, characterized in that: It includes a horizontal wind tunnel dehumidification system, a drop-type slope sand waterfall air drying system, and a vertical sand waterfall drying system connected in sequence; The horizontal wind tunnel dehumidification system includes a wind tunnel box, a material feeding bin, a feeder, a three-layer conveyor belt assembly, a material collection bin, an air supply system 1, and an air induced air system 1. The material feeding bin is arranged at the top of the wind tunnel box away from one end of the drop-type slope trough sand waterfall air drying system, and extends into the wind tunnel box and is connected to the feeder corresponding to one end of the three-layer conveyor belt assembly. The other end of the three-layer conveyor belt assembly extends out of the wind tunnel box and extends into the material collection bin. The bottom outlet of the material collection bin corresponds to the inlet end of the drop-type slope trough sand waterfall air drying system. The air supply system 1 is arranged at the bottom of the wind tunnel box, and the air induced air system 1 is arranged at the top of the wind tunnel box. The drop-type slope trough sand waterfall air drying system includes a material conveyor belt, a collection hopper, a distributor, a louver-type slope trough assembly, a vibrator, a second air supply system, and a second air induced system. The material conveyor belt and the louver-type slope trough assembly are both inclined and connected in an "eight" shape. The lowest end of the material conveyor belt corresponds to the material collection bin, and the highest end extends into the highest end of the louver-type slope trough assembly and is connected to the distributor. The lowest end of the louver-type slope trough assembly corresponds to the inlet end of the vertical sand waterfall drying system. The vibrator is arranged on the louver-type slope trough assembly, the second air supply system is arranged at the lower part of the louver-type slope trough assembly, and the second air induced system is arranged at the top of the louver-type slope trough assembly. The vertical sand waterfall drying system includes a spiral feeder, a sealed distributor, a vertical air drying box, a dry material collector, an air supply system three, an exhaust system, and a wind cyclone. The spiral feeder is arranged at an angle, and its lowest end corresponds to the outlet of the louver-type slope trough assembly, and the highest end is connected with the top of the vertical air drying box through the sealed distributor and the dry material collector. The air supply system three is connected with the vertical air drying box, and the top of the vertical air drying box is connected with the wind cyclone through the exhaust system. The bottom of the wind cyclone is connected with the dust removal bag, and the top of the wind cyclone is connected with the bag dust collector for gas discharge; the louver-type slope trough assembly includes a louver-type slope trough and a slope trough closing cover arranged outside the louver-type slope trough, the highest end of the material conveyor belt extends into the slope trough closing cover, and the bottom of the slope trough of the slope trough closing cover is provided with a louver air supply port corresponding to the air supply system two.

2. A multi-stage natural wind waterfall type fine sand drying device according to claim 1, characterized in that: The three-layer conveyor belt assembly includes an upper conveyor belt, a middle conveyor belt, and a bottom conveyor belt. Adjacent conveyor belts are independently and reversely arranged. The bottom conveyor belt is inclined, and the end thereof extending into the material collection bin is the higher end.

3. The multi-stage natural wind waterfall type fine sand drying device according to claim 1, characterized in that: The bottom of the wind tunnel box is provided with a sloped bottom surface, one end of the sloped bottom surface close to the drop-type slope trough sand waterfall air drying system is the highest end, and the other end is the lowest end. A deep water-sealed floor drain pipe is provided at the lowest end to drain water outwards.

4. The multi-stage natural wind waterfall type fine sand drying device according to claim 1, characterized in that: The bottom of the side wall of the wind tunnel box is evenly provided with a plurality of long strip air inlets along its length direction. The air supply system 1 includes an air supply fan 1 and an air supply duct 1. The air supply fan 1 is connected with the long strip air inlets through the air supply duct 1 to evenly transport wind into the wind tunnel box. The top of the wind tunnel box is evenly provided with a plurality of horizontal air induced openings. The horizontal air induced openings are connected with the air supply fan 1 through the air induced duct. The other end of the air supply fan 1 is connected with an exhaust pipe.

5. The multi-stage natural wind waterfall type fine sand drying device according to claim 1, characterized in that: The second air supply system includes a second air supply fan and a second air supply duct. The second air supply fan is connected to the louver air supply outlet at the bottom of the slope groove of the slope groove closed cover through the second air supply duct. An exhaust outlet is provided on the top of the slope groove closed cover. The exhaust outlet channel exhaust duct is connected to the second induced draft fan.

6. A multi-stage natural wind waterfall type fine sand drying device according to claim 5, characterized in that: The number of the louver air outlets is multiple and they are evenly spaced along the bottom of the slope groove of the slope groove closing cover.

7. The multi-stage natural wind waterfall type fine sand drying device according to claim 1, characterized in that: There are multiple drop-type slope trough sand waterfall air-drying systems, which are arranged end to end in sequence.

8. The multi-stage natural wind waterfall type fine sand drying device according to claim 1, characterized in that: The vertical air drying box is provided with three layers of air drying boxes from top to bottom, and each layer of air drying boxes is provided with an air supply outlet corresponding to the air supply system three. The air supply system three includes air supply fan three and air supply duct three. The air supply fan three is connected to the air supply outlet of the air drying box through air supply duct three. An induced draft duct two is provided on the top of each layer of the air drying box, and the induced draft duct two is discharged into the wind cyclone through the induced draft fan three.

9. The multi-stage natural wind waterfall type fine sand drying device according to claim 8, characterized in that: A cone nozzle is provided at the connection between the bottom of the wind cyclone and the dust removal bag.

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