A grain silo clearing and transporting device and method

Abstract

The present invention relates to a granary clearing and transferring device and method, wherein a manhole is provided on the bottom surface of the granary; an automatic transferring device is arranged below the manhole and is connected to a granary conveying system; a dust suppression device is arranged between the automatic transferring device and the manhole; the automatic transferring device comprises a dropping hopper, which is located directly below the manhole, the bottom end of which is connected to a material transport pipe, and the bottom end of which is connected to the granary conveying system; the dust suppression device comprises an air supply column and a cyclone separator; at least four air supply columns are arranged and installed at the four corners of the dropping hopper, the bottom ends of the air supply columns are respectively connected to a distribution box and a fan through ventilation hoses, and the distribution box is provided with a throttle valve; the air supply directions of the air supply columns are connected end to end, so as to form a relatively closed space outside the space between the manhole and the dropping hopper; the cyclone separator serves as an air suction source, and its air inlet is connected to a part of the material transport pipe close to the bottom end of the dropping hopper through a pipeline, and its air outlet is connected to a side of the material transport pipe close to the granary conveying system.

Description

Technical Field

[0001] The present invention relates to an automatic transfer device for clearing and dropping grain silos, specifically a grain silo clearing and transfer device and method, which can be applied to grain silos, such as the clearing and transfer link of soybean silos, to achieve automatic transfer of clearing and dropping materials and effective control of dust dispersion of dropping materials. The device can also be used in the transfer and loading and unloading process of other bulk materials. The invention belongs to the cross-fields of machinery manufacturing, safety assurance, occupational health protection, etc. Background Art

[0002] During the storage process of large grain silos, grain compaction occurs. After unloading, the compacted material at the bottom of the silo needs to be manually or mechanically shaken out before unloading. In this process, the material needs to be unloaded through the manhole at the bottom of the silo. At present, most silos use the method of dropping the material to the silo floor and then manually loading it into the belt conveyor, which takes a long time.

[0003] During the falling process of materials, a large amount of dust will be generated due to the induced airflow. At present, the problem of large amounts of dust dispersion during the warehouse clearance and material dropping process has not been solved at home and abroad. Grain dust has a high fiber content and will cause irreversible damage to the lungs after inhalation. It is an important protection target for occupational pneumoconiosis hazards. In view of the problem of dust dispersion during warehouse clearance and material dropping, the conventional sealed manhole method cannot be used, because during the operation, the manhole needs to be in an open environment to ensure that people have appropriate fresh air to enter and provide fresh air for the workers in the warehouse.

[0004] In addition, the large amount of dust dispersion poses a serious safety hazard. First, the large amount of grain dust dispersion poses a risk of dust explosion; secondly, the visibility of on-site operations is also reduced due to the dispersion of dust, which hinders operators from predicting production hazards. Summary of the invention

[0005] In order to make up for the problems of low transfer efficiency, serious on-site dust, and numerous safety hazards in traditional granary clearing and transfer operations, a granary clearing and transfer device and method were invented.

[0006] The technical solution adopted by the present invention is: a granary clearing and transferring device, which is composed of an automatic transfer device and a dust suppression device; the granary conveying system is connected to the bottom end of the granary, and a manhole is opened on the bottom surface of the granary; the automatic transfer device is arranged below the manhole and connected to the granary conveying system; a dust suppression device is arranged between the automatic transfer device and the manhole; the automatic transfer device includes a drop hopper, which is located directly below the manhole, and the bottom end of the drop hopper is connected to a material transport pipe, and the bottom end of the material transport pipe is connected to the granary conveying system; the The dust suppression device includes an air supply column and a cyclone separator; at least four air supply columns are arranged and installed at the four corners of the drop hopper, and the bottom ends of the air supply columns are connected to the air distribution box and the fan through ventilation hoses, and the air distribution box is provided with a throttle valve; the air supply directions of the air supply columns are connected end to end to form a relatively closed space outside the manhole and the space between the drop hopper; the cyclone separator serves as an air suction source, and its air inlet is connected to the part of the material transport pipe close to the bottom end of the drop hopper through a pipeline, and the air outlet is connected to the side of the material transport pipe close to the granary conveying system.

[0007] Furthermore, the air supply column includes a vertical wind duct, an air outlet is provided on the side wall of the wind duct, and a guide groove protruding outward is provided at the edge of the air outlet. Regular guide blades are provided along the length of the guide groove to change the direction of the airflow; the guide groove starts from a height of 100mm at the bottom to the top, the guide blade spacing is 40mm, and the guide blades are connected by two steel sheets of equal length; the angle between the side of the guide blade close to the air supply outlet and the vertical direction of the air supply column is angle α; the angle between the side of the guide blade away from the air supply outlet and the vertical direction of the air supply outlet is angle β; the height of the air supply column is set according to the shape of the bottom surface of the granary, and a certain distance is left between the top of each air supply column and the bottom surface of the granary at its corresponding position; the bottom edge of the wind curtain formed by each air supply column is a horizontal straight line structure, and the top edge of the wind curtain is parallel to the bottom surface of the granary in its transmission direction and close to the bottom surface of the granary.

[0008] Furthermore, the angle α is 120 degrees; and the angle β can be adjusted between 110 degrees and 50 degrees.

[0009] Furthermore, four air supply columns are provided, and the first air supply column, the second air supply column, the third air supply column and the fourth air supply column are arranged in a counterclockwise direction, and the air supply outlets of the four air supply columns are arranged in a counterclockwise direction; the first air supply column forms a right-angled contraction type trapezoidal wind curtain with the guide groove as the bottom edge; the second air supply column and the fourth air supply column form rectangular wind curtains respectively; the third air supply column forms a right-angled divergent type trapezoidal wind curtain with the guide groove as the top edge.

[0010] Furthermore, the height of the first air supply column is 2000mm, the angle α between the guide blade and the inner side of the guide groove is 120 degrees, the angle β between the guide blade and the outer side of the guide groove is 110 degrees, the width of the guide groove is 8mm at 0-900mm, and the width of the guide groove gradually decreases from 8mm to 0mm from 900mm-1900mm, and the hypotenuse of the air curtain gradually decreases in height from 1900mm to 900mm of the guide groove.

[0011] Furthermore, the height of the second air supply column is 1000 mm, the angle α between the guide vane and the inner side of the guide groove is 120 degrees, and the angle β between the guide vane and the outer side of the guide groove is 110 degrees.

[0012] Furthermore, the height of the third air supply column is 1000mm, the angle α between the guide blade and the inner edge of the guide groove is 120 degrees, and the angle β between the guide blade and the outer edge of the guide groove is divided into six groups of 100 degrees, 90 degrees, 80 degrees, 70 degrees, 60 degrees and 50 degrees from bottom to top, and the number of guide blades in each group is 4, 4, 3, 4, 3 and 4 respectively; the hypotenuse of the air curtain increases in height from 900mm to 1900mm.

[0013] Furthermore, the height of the fourth air supply column is 1000 mm, the angle α between the guide vane and the inner side of the guide groove is 120 degrees, and the angle β between the guide vane and the outer side of the guide groove is 110 degrees.

[0014] Furthermore, the air supply column adopts The edge of the air outlet is provided with a guide groove extending about 35mm outward; the ventilation hose is made of PU hose; the drop hopper is formed by cutting and welding a 2mm thick steel plate, the drop hopper working platform is a steel grid structure, and the material transport pipe is It is made of steel round pipe cutting and welding.

[0015] Furthermore, a steel structure support frame and a ladder are fixedly connected to the bottom of the working platform, and the ladder is fixed to one side of the working platform to facilitate the workers to go up and down; guardrails are provided on the edges of the working platform to play a role in safety protection; the working platform serves as the basic support of the transfer system and is fixed to the ground with bolts, and other dimensions are determined according to the design selection; the working platform includes an inner working platform and an outer working platform, the inner working platform serves as a support for the workers to enter and exit the granary; the outer working platform serves as a support for the workers to enter the hopper.

[0016] Furthermore, cylindrical connecting parts are arranged at the four corners of the inner working platform. The outer diameter of the cylindrical connecting parts is slightly smaller than the inner diameter of the air supply column. The two are connected by plugging. Bolt holes are opened at the bottom of the air supply column, which can be tightened by screwing in bolts. The lower part of the cylindrical connecting part extends out of the drop hopper and is connected to the air supply hose by threads.

[0017] Furthermore, the upper section of the transport pipe is a square transport pipe, and the lower section is a circular transport pipe. A discharge port is provided on one side of the square transport pipe, which is connected to the air inlet of the cyclone separator through a flange; the bottom of the square transport pipe is contracted and connected to the circular transport pipe, the lower part of the circular transport pipe is folded to one side, and the bottom is connected to the granary conveying system.

[0018] The air distribution box is provided with four air distribution ports and one air inlet. The four air distribution ports are respectively provided with throttle valves. The air inlet is connected to the fan through a ventilation hose. A connector with a threaded hole is provided on the box body of the air distribution box for installation and fixing on a steel structure support frame.

[0019] A method for clearing and transporting a grain silo: start the fan, and the fresh air is sent into the ventilation hose through the fan, and then is divided into four ventilation hoses with throttle valves at the front end after passing through the air distribution box, and then enters the air supply column, and the air supply column generates a rotating wind curtain connected end to end and sealed; at the same time, the cyclone separator is started to form a negative pressure inside and above the drop hopper; the material carrying dust and impurities in the air flow falls from the manhole, and the heavier particles with a speed mainly in the vertical direction directly fall into the drop hopper and enter the grain silo conveying system through the material transport pipe; the lighter particles with a speed mainly in the horizontal direction When the particles impact the air curtain, their horizontal velocity is offset by the horizontal velocity component of the air curtain. The dust enters the rotating airflow of the air curtain and spirally falls into the hopper under the negative pressure generated by the cyclone separator to achieve dust control. When the dust, impurities and a small amount of material fall into the material transport pipe under the hopper, they are sucked into the cyclone separator. The cyclone separator gathers the raised and scattered dust and settles it into the grain silo conveying system to achieve dust removal. Most materials automatically enter the grain silo conveying system under the action of gravity, and the silo clearance and transportation work is completed.

[0020] Beneficial effects of the invention: The invention realizes the automatic transfer of materials during the silo clearing process, solving the problems of low efficiency, long time and many safety hazards in the manual transfer process. At the same time, the system solves the problem of dust dispersion during the material dropping process through a dust suppression device and method, and realizes the capture and purification of dispersed dust while ensuring normal air supply inside the manhole, reducing the occupational hazards and production safety hazards caused by dust dispersion. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a schematic diagram of the overall structure of the present invention.

[0022] Figure 2 It is a front view schematic diagram of the automatic transfer device.

[0023] Figure 3 It is a top view schematic diagram of the automatic transfer device.

[0024] Figure 4-1 It is a schematic diagram of the structure of the first air supply column.

[0025] Figure 4-2 Schematic diagram of the air curtain structure of the first air supply column.

[0026] Figure 4-3 It is a structural schematic diagram of the second air supply column.

[0027] Figure 4-4 Schematic diagram of the air curtain structure of the second air supply column.

[0028] Figure 4-5 This is a schematic diagram of the structure of the third air supply column.

[0029] Figure 4-6 This is a schematic diagram of the air curtain structure of the third air supply column.

[0030] Figure 4-7 It is a structural schematic diagram of the fourth air supply column.

[0031] Figure 4-8 Schematic diagram of the wind curtain structure of the fourth air supply column.

[0032] Figure 5 It is an enlarged view of the structure of the air supply column guide vane in Figure 4.

[0033] Figure 6 It is the connection diagram of the air supply column and the cylindrical connecting piece.

[0034] Figure 7 for Figure 6 AA section view.

[0035] Figure 8 It is a schematic diagram of the wind box structure.

[0036] Fig. 9 This is a schematic diagram of the warehouse clearance and transshipment operation.

[0037] Fig.10 Label the diagram for the air curtain shape.

[0038] Fig.11 This is the horizontal distance diagram from the air outlet. DETAILED DESCRIPTION

[0039] like Figure 1As shown, 0-1 is the granary; 0-2 is the manhole at the bottom of the granary, which is also used as the drop-off port for clearing and transferring; 0-3 is the granary conveying system, which is partially opened during the clearing and transferring stage and is the destination of clearing and transferring; 1 is the automatic transfer device; 2 is the dust suppression system. 2-1 is the air supply column, which includes four columns; 2-1-1, 2-1-2, 2-1-3, and 2-1-4 are the first air supply column, the second air supply column, the third air supply column, and the fourth air supply column; 2-2 is the fan, with an air supply volume of 700 to 1000m 3 / h; 2-3 is the air box, 2-3-1 is the throttle valve; 2-4 is the cyclone separator, which is the air suction source. A large amount of dust and a small amount of material enter and rotate and separate, and then enter the end of the material transport pipe after sedimentation. The respirable dust is removed in the centralized dust removal system along with the grain silo conveying system; the air volume of the cyclone separator 2-4 is 1500~2500m 3 / h; 2-5 is a motor used to drive the fan 2-4 to rotate.

[0040] The bottom end of the granary 0-1 is connected to the granary conveying system 0-3, and a manhole 0-2 is provided on the bottom surface of the granary 0-1; the automatic transfer device 1 is arranged below the manhole 0-2 and connected to the granary conveying system 0-3; a dust suppression device 2 is arranged between the automatic transfer device 1 and the manhole 0-2; the automatic transfer device 1 comprises a drop hopper 1-1, the drop hopper 1-1 is located directly below the manhole 0-2, the bottom end of the drop hopper 1-1 is connected to a material transport pipe, and the bottom end of the material transport pipe is connected to the granary conveying system 0-3; the dust suppression device 2 comprises an air supply column 2-1 and a cyclone separator 2-4; at least four air supply columns 2-1 are arranged, which are installed at the four corners of the drop hopper 1-1, and the bottom ends of the air supply columns 2-1 are respectively connected to the air distribution box 2-3 and the fan 2-2 through ventilation hoses, and the ventilation hoses adopt PU hose; the air distribution box 2-3 is provided with a throttle valve 2-3-1; the air supply direction of the air supply column 2-1 is connected end to end, forming a relatively closed space outside the space between the manhole 0-2 and the drop hopper 1-1; the cyclone separator 2-4 serves as an air suction source, and its air inlet is connected to the part of the material transport pipe close to the bottom end of the drop hopper 1-1 through a pipeline, and the air outlet is connected to the side of the material transport pipe close to the granary conveying system 2-3.

[0041] like Figure 21-1 is a material hopper, which is formed by cutting and welding a 2mm thick steel plate, and guides the material and dust airflow into the material transport pipe or cyclone separator; 1-2 is an inner working platform, which serves as a support for workers to enter and exit the granary; 1-3 is an outer working platform, which serves as a support for workers to enter the material hopper; 1-4 is a guardrail; 1-5 is a straight ladder; 1-6 is a square material transport pipe, which is connected to the material hopper 1-1 upwards and connected to the circular material transport pipe 1-7 downwards, and one side is connected to the cyclone separator 2-4; the circular material transport pipe 1-7 is connected downwards to the granary conveying system 0-3; 1-8 is a steel structure support.

[0042] The inner working platform 1-2 and the outer working platform 1-3 are steel grating structures, with a steel structure support frame 1-8 and a ladder 1-5 fixedly connected at the bottom. The ladder 1-5 is fixed on one side of the working platform to facilitate the workers to go up and down; guardrails 1-4 are provided on the edges of the working platform to play a role in safety protection; the working platform serves as the basic support of the transfer system and is fixed to the ground with bolts, and other dimensions are determined according to the design selection; the working platform includes an inner working platform 1-2 and an outer working platform 1-3, the inner working platform 1-2 serves as a support for the workers to enter and exit the granary; the outer working platform 1-3 serves as a support for the workers to enter the hopper.

[0043] like Figure 3 , 7 As shown in Figure 8, the four corners of the inner working platform 1-2 are provided with a first tubular connector 1-2-1, a second tubular connector 1-2-2, a third tubular connector 1-2-3, and a fourth tubular connector 1-2-4, which are respectively used to connect the first air supply column 2-1-1, the second air supply column 2-1-2, the third air supply column 2-1-3, and the fourth air supply column 2-1-4. The outer diameter of the cylindrical connector is slightly smaller than the inner diameter of the air supply column, and the two are connected by plugging. The bottom of the air supply column 2-1 is provided with a bolt hole, which can be tightened by screwing in the bolt; the lower part of the cylindrical connector extends out of the drop hopper 1 and is connected to the air supply hose by threading. The air supply direction of the four air supply columns is connected end to end to form a relatively closed space. According to the structure of the granary, air supply columns of different heights and specifications are designed. The four air supply columns are arranged in a counterclockwise direction, and the air supply outlet is arranged in a counterclockwise direction.

[0044] like Figure 2 As shown, the upper section of the material transport pipe is a square material transport pipe 1-6, and the lower section is a circular material transport pipe 1-7. The circular material transport pipe 1-7 is The square material transport pipe 1-6 is cut and welded from steel round pipes; a discharge port is provided on one side of the square material transport pipe 1-6, which is connected to the air inlet of the cyclone separator 2-4 through a flange; the bottom of the square material transport pipe 1-6 is contracted and connected to the round material transport pipe 1-7, the lower part of the round material transport pipe 1-6 is folded to one side, and the bottom is connected to the granary conveying system.

[0045] like Figure 5 As shown, the air supply column 2-1 is a hollow structure. The side wall of the air outlet 2-7 is provided with a guide groove 2-8 protruding outward by about 35 mm at the edge of the air outlet 2-7, and regular guide blades 2-9 are arranged along the length of the guide groove 2-8 to change the direction of the air flow; the guide groove 2-8 starts from a height of 100 mm at the bottom to the top, the guide blades 2-9 are spaced 40 mm apart, and the guide blades 2-9 are connected by two steel sheets of equal length; the side of the guide blade 2-9 close to the air supply outlet forms an angle α with the vertical direction of the air supply column 2-1; the side of the guide blade 2-9 away from the air supply outlet forms an angle β with the vertical direction of the air supply outlet; the angle α is 120 degrees; the angle β can be adjusted between 110 degrees and 50 degrees. The height of the air supply column 2-1 is set according to the shape of the bottom surface of the granary, and a certain distance is left between the top of each air supply column and the bottom surface of the granary at its corresponding position; the bottom edge of the wind curtain formed by each air supply column 2-1 is a horizontal straight line structure, and the top edge of the wind curtain is parallel to the bottom surface of the granary in its transmission direction and close to the bottom surface of the granary.

[0046] like Figure 8 As shown, the air distribution box 2-3 is provided with four air distribution ports 2-3-2 and one air inlet 2-3-3. The four air distribution ports 2-3-2 are respectively provided with throttle valves 2-3-1. The air inlets are connected to the fan 2-2 via ventilation hoses. A connector with threaded holes is provided on the box body of the air distribution box 2-3 for installation and fixation on the steel structure support frame 1-8.

[0047] like Figures 4-1 to 4-8 As shown, the first air supply column 2-1-1 forms a right-angle contraction type trapezoidal air curtain with the guide groove as the bottom edge; the second air supply column 2-1-2 and the fourth air supply column 2-1-4 form rectangular air curtains respectively; the third air supply column 2-1-3 forms a right-angle divergence type trapezoidal air curtain with the guide groove as the top edge.

[0048] like Figure 4-1 and 4-2 As shown, the height of the first air supply column 2-1-1 is 2000mm, the angle α between the guide blade and the inner side of the guide groove is 120 degrees, the angle β between the guide blade and the outer side of the guide groove is 110 degrees, the width of the guide groove is 8mm at 0-900mm, and the width of the guide groove gradually decreases from 8mm to 0mm from 900mm-1900mm, and the bevel of the air curtain gradually decreases in height from 1900mm to 900mm of the guide groove.

[0049] like Figure 4-3 and 4-4As shown, the height of the second air supply column 2-1-2 is 1000 mm, the angle α between the guide vane and the inner side of the guide groove is 120 degrees, and the angle β between the guide vane and the outer side of the guide groove is 110 degrees.

[0050] like Figure 4-5 and 4-6 As shown, the height of the third air supply column 2-1-3 is 1000mm, the angle α between the guide vane and the inner side of the guide groove is 120 degrees, and the angle β between the guide vane and the outer side of the guide groove is divided into six groups of 100 degrees, 90 degrees, 80 degrees, 70 degrees, 60 degrees and 50 degrees from bottom to top, and the number of guide vanes in each group is 4, 4, 3, 4, 3 and 4 respectively; the hypotenuse of the air curtain increases in height from 900mm to 1900mm.

[0051] like Figure 4-7 and 4-8 As shown, the height of the fourth air supply column 2-1-4 is 1000 mm, the angle α between the guide vane and the inner side of the guide groove is 120 degrees, and the angle β between the guide vane and the outer side of the guide groove is 110 degrees.

[0052] like Figure 1 , 9 As shown, 3-1 is fresh air, 4-1 is falling material; 4-2 is material and dust entering the material transport pipe; 4-3 is lighter material dust entering the cyclone dust collector, and 4-4 is material and dust after sedimentation entering the granary conveying system. A method for clearing and transporting a granary: start the fan 2-2, and the fresh air is sent into the ventilation hose through the fan 2-2, and after passing through the wind box 2-3, it is divided into 4 ventilation hoses with throttle valves 2-3-1 at the front end, and then enters the air supply column 2-1, and the air supply column 2-1 produces a closed rotating wind curtain connected end to end; at the same time, start the cyclone separator 2-4 to form a negative pressure inside and above the drop hopper 1-1; the airflow carries the material with dust impurities and falls from the manhole 0-1, and the heavier particles with mainly vertical speed fall directly into the drop hopper 1-1 and enter the granary conveying system through the material transport pipe; Lighter particles with mainly horizontal speed impact the air curtain, and their horizontal speed is offset by the horizontal speed component of the air curtain. The dust enters the rotating airflow of the air curtain and spirally falls into the hopper 1-1 under the joint action of the negative pressure generated by the cyclone separator, thereby achieving dust control; dust, impurities and a small amount of material fall into the material transport pipe below the hopper 1-1 and are sucked into the cyclone separator. The cyclone separator 2-4 gathers the raised and dispersed dust and settles it, then sends it into the grain silo conveying system to achieve dust removal; most materials automatically enter the grain silo conveying system under the action of gravity, and the silo clearing and transportation work is completed.

[0053] The above is about the calculation of air volume of a single air supply column:

[0054] q n=λ0λ n b n l n v×3600 Formula 1

[0055] Where, q-single air supply column air volume, m 3 / h; λ0-correction coefficient obtained from experiments, the value range is about 0.75-1.25 according to the working conditions; λ n -Correction coefficient; b-air outlet width, unit: m; l-air outlet height, unit: m; v-reference air supply speed, unit: m / s; Fig.10 ; n-air supply column number.

[0056] In addition, λ n The correction coefficient representing the relationship between the volume of a conventional rectangular air curtain and the volume of a target air curtain is calculated as follows:

[0057]

[0058] Wherein, h is the height of target wind curtain, in m; s is the range of target wind curtain, in m.

[0059] Regarding the calculation of cyclone separator air volume, the formula is:

[0060] Q 旋风分离器 =γKQ 送风 Formula 3

[0061] In the formula, Q 旋风分离器 - Cyclone air volume, unit: m 3 / h;Q 送风 -The sum of the air volume of the air supply columns, unit: m 3 / h; γ-material mass flow coefficient, obtained from experience; K-pumping ratio; where,

[0062] Q 送风 =q1+q2+q3+···+q n Formula 4

[0063] Where, q is the air volume of a single air supply column, in m 3 / h; n-air supply column number.

Claims

1. A grain silo clearing and transporting device, characterized in that: The invention is composed of an automatic transfer device and a dust suppression device; the bottom end of the granary is connected to the granary conveying system, and a manhole is provided on the bottom surface of the granary; the automatic transfer device is arranged below the manhole and connected to the granary conveying system; a dust suppression device is arranged between the automatic transfer device and the manhole; the automatic transfer device includes a drop hopper, which is located directly below the manhole, and the bottom end of the drop hopper is connected to a material transport pipe, and the bottom end of the material transport pipe is connected to the granary conveying system; the dust suppression device includes an air supply column and a cyclone separator; at least four air supply columns are arranged, which are installed at the four corners of the drop hopper, and the bottom ends of the air supply columns are respectively connected to a distribution box and a fan through ventilation hoses, and the distribution box is provided with a throttle valve; the air supply directions of the air supply columns are connected end to end, and a relatively closed space is formed outside the space between the manhole and the drop hopper; the cyclone separator serves as an air suction source, and its air inlet is connected to the part of the material transport pipe close to the bottom end of the drop hopper through a pipeline, and the air outlet is connected to the side of the material transport pipe close to the granary conveying system; The air supply column comprises a vertical air duct, an air outlet is arranged on the side wall of the air duct, a guide groove protruding outward is arranged at the edge of the air outlet, and regular guide blades are arranged along the length of the guide groove to change the direction of the air flow; the guide groove starts from a height of 100mm at the bottom to the top, the guide blade spacing is 40mm, and the guide blade is formed by connecting two steel sheets of equal length; the angle between the side of the guide blade close to the air outlet and the vertical direction of the air supply column is α Angle; the angle between the side of the guide vane away from the air outlet and the vertical direction of the air outlet is β Angle; the height of the air supply column is set according to the shape of the bottom surface of the granary, and a certain distance is left between the top of each air supply column and the bottom surface of the granary at its corresponding position; the bottom edge of the air curtain formed by each air supply column is a horizontal straight line structure, and the top edge of the air curtain is parallel to the bottom surface of the granary in the transmission direction and close to the bottom surface of the granary; Said α The angle is 120 degrees; β The angle can be adjusted between 110 degrees and 50 degrees; There are four air supply columns, and the first air supply column, the second air supply column, the third air supply column and the fourth air supply column are arranged in a counterclockwise direction, and the air supply outlets of the four air supply columns are arranged in a counterclockwise direction; the first air supply column forms a right-angled contraction type trapezoidal wind curtain with the guide groove as the bottom edge; the second air supply column and the fourth air supply column form rectangular wind curtains respectively; the third air supply column forms a right-angled divergent trapezoidal wind curtain with the guide groove as the top edge.

2. A grain silo clearing and transporting device according to claim 1, characterized in that: The height of the first air supply column is 2000 mm. α The angle is 120 degrees. β The angle is 110 degrees, the width of the guide groove is 8mm at 0-900mm, the width of the guide groove gradually decreases from 8mm to 0mm from 900mm-1900mm, and the hypotenuse of the air curtain gradually decreases in height from 1900mm to 900mm of the guide groove.

3. A grain silo clearing and transporting device according to claim 1, characterized in that: The height of the second air supply column is 1000 mm. α The angle is 120 degrees, β The angle is 110 degrees.

4. A grain silo clearing and transporting device according to claim 1, characterized in that: The height of the third air supply column is 1000 mm. α The angle is 120 degrees, β The angles are divided into six groups from bottom to top, namely 100 degrees, 90 degrees, 80 degrees, 70 degrees, 60 degrees and 50 degrees. The number of guide blades in each group is 4, 4, 3, 4, 3 and 4 respectively; the beveled edge of the air curtain increases in height from 900mm to 1900mm.

5. The grain silo clearing and transporting device according to claim 1, characterized in that: The height of the fourth air supply column is 1000 mm. α The angle is 120 degrees, β The angle is 110 degrees.

6. A grain silo clearing and transporting device according to claim 1, characterized in that: The air supply column is made of φ150×2mm steel round tube; the ventilation hose is made of φ150×2mm PU hose; the drop hopper is cut and welded from 2mm thick steel plate, the drop hopper working platform is a steel grid structure, and the material transport pipe is cut and welded from φ300×2 mm steel round tube.

7. A method for clearing and transporting grain silos using the device according to any one of claims 1 to 6, characterized in that: Start the fan, and the fresh air is sent into the ventilation hose through the fan, and then into 4 ventilation hoses with throttle valves at the front end after passing through the air distribution box, and then enters the air supply column, which produces a closed rotating wind curtain connected end to end; at the same time, the cyclone separator is started to form a negative pressure inside and above the hopper; the material with dust and impurities carried by the air flow falls from the manhole, and the heavier particles with mainly vertical speed fall directly into the hopper and enter the granary conveying system through the material transport pipe; the lighter particles with mainly horizontal speed impact the wind The horizontal speed of the wind curtain is offset by the horizontal speed component of the wind curtain. The dust enters the rotating airflow of the wind curtain and spirally falls into the hopper under the negative pressure generated by the cyclone separator to achieve dust control. Dust, impurities and a small amount of material fall into the material transport pipe under the hopper and are sucked into the cyclone separator. The cyclone separator gathers the raised and scattered dust and settles it into the grain silo conveying system to achieve dust removal. Most materials automatically enter the grain silo conveying system under the action of gravity, and the silo clearance and transportation work is completed.

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