A centrifugal separation device for a grain dryer

Abstract

This invention discloses a centrifugal separation device for a grain dryer, relating to the field of centrifugal separation technology. It includes a centrifugal gas-liquid separator, which has an open-end vent pipe and spiral blades surrounding the vent pipe. It also includes a cleaning unit on the centrifugal gas-liquid separator for removing dust clumps from the spiral blades. The cleaning unit removes dust clumps from the spiral blades, preventing them from affecting gas-liquid separation efficiency. An automatic adjustment unit controls the moving block to move at a uniform and stable speed, ensuring that dust is brushed off evenly and effectively, preventing accumulation or over-cleaning in certain areas, and extending the lifespan of the brush bristles. An angle self-adjustment unit adaptively changes the movement path of the moving rollers, facilitating the adaptive movement of the moving block.

Description

Technical Field

[0001] This invention relates to the field of centrifugal separation technology, and in particular to a centrifugal separation device for a grain dryer. Background Technology

[0002] Grain circulating drying equipment, for reference Figure 1 It includes a grain drying chamber 1 (used to store grain), an air inlet chamber 2, a flue gas recirculation device 3 (which reheats the purified exhaust gas and sends it to the air inlet chamber, and finally enters the grain drying chamber 1 to dry the grain), a feeding mechanism 4, and a purification box 5 (with an exhaust gas discharge pipe at the top and a valve inside). The purification box 5 is equipped with a centrifugal separation mechanism for separating liquid and solid dust from the gas. During operation, the grain is transported to the grain drying chamber 1 by the feeding mechanism 4. The gas is heated by the flue gas recirculation device 3 and enters the grain drying chamber through the air inlet chamber 2. The gas containing moisture and dust enters the purification box 5 for purification and then enters the flue gas recirculation device 3 for reheating to a constant temperature for reuse.

[0003] The centrifugal separation mechanism generally consists of a centrifugal gas-liquid separator 8 (which mainly separates fine water droplets from the gas, and an air pump 7 is installed on its inlet pipe, with the inlet end of the air pump 7 connected to the outlet end of the grain drying chamber 1) and a cyclone separator 9 (which mainly separates dust particles from the gas). In actual operation, as the centrifugal gas-liquid separator continues to separate the gas and liquid, the moisture content in the gas entering the centrifugal gas-liquid separator decreases, meaning the gas becomes drier. Dust on the grain will enter the centrifugal gas-liquid separator 8 with the airflow and come into contact with and adhere to the wet (i.e., not yet dry) spiral blades. The dust accumulates and forms clumps (due to subsequent heating by hot air). As the dust accumulates thicker, the internal flow channel becomes narrower, affecting the gas-liquid separation efficiency. Therefore, this application provides a centrifugal separation device for a grain dryer to meet the requirements. Summary of the Invention

[0004] The purpose of this application is to provide a centrifugal separation device for a grain dryer to solve the technical problem of dust accumulation on existing spiral blades.

[0005] To achieve the above objectives, this application provides the following technical solution: a centrifugal separation device for a grain dryer, comprising a centrifugal gas-liquid separator with an air inlet pipe and a liquid outlet pipe, wherein the centrifugal gas-liquid separator is provided with an air vent pipe with an open lower end and spiral blades disposed around the air vent pipe, the air vent pipe being connected to an air outlet pipe, and further comprising a cleaning unit disposed on the centrifugal gas-liquid separator for removing dust clumps on the spiral blades.

[0006] As a preferred embodiment of this example, the cleaning unit includes a housing fixedly disposed on the outer wall of the centrifugal gas-liquid separator, a bidirectional screw rotatably disposed in the inner cavity of the housing, a limiting plate fixed to the upper end of the spiral blade, a discharge opening opened at the end of the spiral blade, and an upper opening and a lower opening disposed vertically on the outer wall of the centrifugal gas-liquid separator.

[0007] The lower end of the bidirectional screw is fixedly connected to the output shaft of the drive motor fixed at the bottom of the housing. A ball nut is threaded on the bidirectional screw, and a limiting slide rod and a bearing plate with the upper end set at the left and right height are fixed on the outer wall of the ball nut. The right end of the limiting slide rod is slidably disposed in a rectangular slide groove on the inner wall of the housing. A movable block is placed on the bearing plate, and rubber rollers are respectively inclinedly disposed on both sides of the movable block. Multiple movable rollers are disposed at the lower end of the movable block, and the outer edge of the movable rollers is set with a pointed tip. Multiple sets of bristles are disposed at the bottom of the movable block.

[0008] The inner cavity of the shell and the centrifugal gas-liquid separator are connected through the upper opening and the lower opening. Both the upper opening and the lower opening are provided with sealing units. The sealing unit includes a sealing plate that is rotatably disposed therein. An elastic sealing layer is provided on the outer wall of the sealing plate. The lower end of the sealing plate abuts against the inclined surface provided at the bottom of the corresponding opening. The inclined surface is connected to the end of the spiral blade.

[0009] When the lower sealing plate rotates counterclockwise, the lower opening is opened; when the upper sealing plate rotates clockwise, the upper opening is opened.

[0010] The tilting direction and angle of the two rubber rollers are consistent with the helical direction and angle of the helical blade;

[0011] A humidity sensor is also located near the air inlet of the centrifugal gas-liquid separator. Both the humidity sensor and the drive motor are electrically connected to the controller.

[0012] As a preferred embodiment of this invention, an automatic adjustment unit is also included, which is installed on the moving block and is used to control the moving block to move at a uniform speed and smoothly.

[0013] As a preferred embodiment of this embodiment, the automatic adjustment unit includes an airbag and a movable column installed in the same movable block cavity, and a set of rubber rollers arranged near the vent pipe with an annular air cavity inside;

[0014] The annular air chamber is connected to the connecting channel of the mounting shaft of the rubber roller. A rotary joint is provided at the upper end of the mounting shaft, and the rotary joint is connected to the airbag through a connecting pipe.

[0015] The movable column is movably disposed within the movable cavity, and the outer wall of the movable column is densely covered with ball bearings.

[0016] As a preferred embodiment of this invention, it also includes an angle self-adjustment unit, which is provided in four sets, each corresponding to one of the four sets of movable rollers. One end of the unit is disposed on the movable block, and the other end is disposed on the movable roller, for adaptively adjusting the deflection angle of the four movable rollers.

[0017] As a preferred embodiment of this invention, the angle self-adjustment unit includes two sets of blocks with universal ball bearings at their outer ends, two sets of arc springs, and a limiting ring disposed in the inner cavity of the moving block.

[0018] The two blocks are respectively connected to the two ends of the rotating shaft of the corresponding movable roller, the two universal balls slide against the inner wall of the limiting ring, the two blocks are respectively fixedly connected to the movable block by the arc spring, and the bottom of the movable block is provided with a deflection opening adapted to the movable roller.

[0019] As a preferred embodiment of this invention, a vibrating unit is also included, which is disposed on the spiral blades to drive the moving block to vibrate and shake off the dust on the bristles.

[0020] In a preferred embodiment of this invention, the vibrating material unit includes two sets of protruding units disposed near the end of the spiral blade, and each set of protruding units is provided with multiple sets of protrusions at equal intervals.

[0021] In summary, the technical effects and advantages of this invention are as follows:

[0022] 1. The present invention has a reasonable structure and is equipped with a cleaning unit on the centrifugal gas-liquid separator to remove dust clumps on the spiral blades and avoid affecting the gas-liquid separation efficiency.

[0023] 2. In this invention, an automatic adjustment unit is provided to control the moving block to move at a uniform and stable speed, which helps to ensure that the dust is brushed off evenly and effectively, avoids accumulation or over-cleaning in certain areas, and also helps to extend the service life of the brush bristles.

[0024] 3. In this invention, an angle self-adjustment unit is provided, which can adaptively change the movement path of the moving roller, which is beneficial for the moving block to move downwards in a spiral on the spiral blade, and also beneficial for the moving block to move in a straight line on the support plate. Attached Figure Description

[0025] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0026] Figure 1 This is a schematic diagram of an existing grain dryer.

[0027] Figure 2 This is a schematic diagram of the internal structure of the cleanroom.

[0028] Figure 3 for Figure 2 A schematic diagram of a partial cross-sectional structure of a centrifugal gas-liquid separator and its shell;

[0029] Figure 4 for Figure 3 Enlarged structural diagram at point A in the middle;

[0030] Figure 5 for Figure 3 Enlarged structural diagram of point B in the middle;

[0031] Figure 6 A schematic diagram of the moving block entering the spiral blade structure;

[0032] Figure 7 This is a schematic diagram of a partial cross-sectional structure of the moving block;

[0033] Figure 8 This is a schematic diagram of a partial top-view cross-sectional structure of the movable block;

[0034] Figure 9 This is a schematic diagram of the end structure of a helical blade.

[0035] In the diagram: 1. Grain drying chamber; 2. Air inlet chamber; 3. Flue gas recirculation equipment; 4. Feeding mechanism; 5. Purification box; 6. Exhaust gas pipe; 7. Air pump; 8. Centrifugal gas-liquid separator; 81. Spiral blades; 82. Vent pipe; 83. Discharge opening; 84. Protrusion; 9. Cyclone separator; 10. Housing; 11. Humidity sensor; 12. Bidirectional screw; 13. Ball bearing nut; 14. Limiting slide bar; 15. Drive... 16. Motor; 17. Bearing plate; 18. Sealing plate; 19. Lower opening; 20. Moving block; 21. Rubber roller; 22. Brush bristles; 23. Moving roller; 24. Limiting plate; 25. Upper opening; 26. Airbag; 27. Connecting pipe; 28. Movable column; 29. ​​Rotary joint; 30. Annular air chamber; 31. Rotating shaft; 32. Block; 33. Universal ball bearing; 34. Arc spring; 35. Limiting ring; 36. Partition plate. Detailed Implementation

[0036] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0037] Example: Reference Figure 2 The centrifugal separation device for a grain dryer shown includes a centrifugal gas-liquid separator 8 with an air inlet pipe and a liquid outlet pipe. The centrifugal gas-liquid separator 8 is provided with an air vent pipe 82 with an open lower end and spiral blades 81 arranged around the air vent pipe 82. The air vent pipe 82 is connected to the air outlet pipe. It also includes a cleaning unit arranged on the centrifugal gas-liquid separator 8 for removing dust clumps on the spiral blades 81.

[0038] As a preferred embodiment of this example, Figure 2-7 As shown, the cleaning unit includes a housing 10 fixedly installed on the outer wall of the centrifugal gas-liquid separator 8, a bidirectional screw 12 rotatably installed in the inner cavity of the housing 10, a limiting plate 23 fixed on the upper end of the spiral blade 81, a discharge opening 83 opened on the end of the spiral blade 81, and an upper opening 24 and a lower opening 18 arranged vertically and opened on the outer wall of the centrifugal gas-liquid separator 8.

[0039] The lower end of the bidirectional screw 12 is fixedly connected to the output shaft of the drive motor 15 fixed at the bottom of the housing 10. A ball nut 13 is threaded on the bidirectional screw 12. A limiting slide rod 14 and a bearing plate 16 with the upper end set at the left and right heights are fixed on the outer wall of the ball nut 13. The right end of the limiting slide rod 14 is slidably disposed in a rectangular groove on the inner wall of the housing 10. A moving block 19 is placed on the bearing plate 16. Rubber rollers 20 are inclinedly disposed on both sides of the moving block 19. Multiple moving rollers 22 are disposed at the lower end of the moving block 19. The outer edge of the moving rollers 22 is set with a pointed tip. Multiple sets of bristles 21 are disposed at the bottom of the moving block 19.

[0040] The inner cavities of the housing 10 and the centrifugal gas-liquid separator 8 are connected through the upper opening 24 and the lower opening 18. Both the upper opening 24 and the lower opening 18 are provided with sealing units. The sealing unit includes a sealing plate 17 that is rotatably disposed therein. An elastic sealing layer is provided on the outer wall of the sealing plate 17. The lower end of the sealing plate 17 abuts against the inclined surface provided at the bottom of the corresponding opening cavity. The inclined surface is connected to the end of the spiral blade 81.

[0041] When the lower sealing plate 17 is rotated counterclockwise, the lower opening 18 is opened; when the upper sealing plate 17 is rotated clockwise, the upper opening 24 is opened.

[0042] The tilting direction and angle of the two rubber rollers 20 are consistent with the helical direction and angle of the helical blade 81;

[0043] A humidity sensor 11 is also installed near the air inlet of the centrifugal gas-liquid separator 8. Both the humidity sensor 11 and the drive motor 15 are electrically connected to the controller.

[0044] When the humidity sensor 11 detects that the humidity entering the centrifugal gas-liquid separator 8 is very low or almost non-existent (at which point dust clumps at the upper end of the spiral blades 81), the controller controls the drive motor 15 to operate, driving the bidirectional screw 12 to rotate. When the moving block 19 moves to the position of the upper opening 24, the moving block 19 moves along the inclined surface set at the upper end of the support plate 16 by its own gravity, and opens the sealing plate 17 located above by the component force of gravity. Finally, the moving block 19 enters the spiral blades 81 of the centrifugal gas-liquid separator 8 and moves spirally downward along the spiral blades 81. During the movement, Two inclined rubber rollers 20 slide against the inner wall of the tank of the centrifugal gas-liquid separator 8 and the outer wall of the vent pipe 82 respectively. When moving, the bristles 21 brush the dust block to generate dust or fine dust blocks. The dust will move with the airflow entering the centrifugal gas-liquid separator 8 and will eventually be carried by the airflow to the cyclone separator 9 for solid-gas separation. The fine dust blocks will be directly discharged by the drain pipe set at the bottom of the centrifugal gas-liquid separator 8. The downward moving block 19 will eventually collide with the sealing plate 17 set in the lower opening 18 and eventually enter the bearing plate 16 that returns to its original position.

[0045] Sealing plates 17 are provided in both the upper opening 24 and the lower opening 18 to prevent liquid from entering the inner cavity of the housing 10 through the lower opening 18 when the centrifugal gas-liquid separator 8 is performing gas-liquid separation. At the same time, the upper sealing plate 17 can prevent gas from entering the housing 10 from the upper opening 24.

[0046] When gas-liquid separation is performed using the centrifugal gas-liquid separator 8, the generated liquid can move downwards through the discharge opening 83 and be discharged outwards.

[0047] It is important to note the following: First, the outer surfaces of both sides of the moving block 19 are arc-shaped, adapting to the inner wall of the centrifugal gas-liquid separator 8 and the outer wall of the vent pipe 82, thus limiting the movement of the moving block 19 and facilitating its stable downward movement along the spiral path of the spiral blade 81. Second, because the outer edges of the moving rollers 22 (which can be configured in multiple sets as needed) are pointed, they easily generate localized high pressure upon contact, which helps to break or loosen dust clumps, thereby facilitating the brush bristles 21 to thoroughly clean the dust clumps on the spiral blade 81 in one go. Third, the moving block 19 can also be allowed to enter the centrifugal gas-liquid separator 8 multiple times for processing as needed, further improving the processing effect. Fourth, the outer surface of the brush bristles 21 is made rough, which is more conducive to... The dust blocks are brushed and scraped into powder, which further facilitates the one-time thorough cleaning of the dust blocks; Fifth, a partition 35 is set in the purification box 5, and the other side of the partition is the air outlet chamber, which is connected to the air outlet end of the grain drying chamber 1, while the air inlet end of the centrifugal gas-liquid separator 8 is located in the air outlet chamber; Sixth, an elastic buffer block is provided on the support plate 16, which can contact and collide with the moving block 19 for buffering; Seventh, when the moving block 19 cleans the dust blocks, it relies on gravity to drive the moving block 19 to clean, and there is no consumption of electrical energy. Some electrical energy is consumed when lifting the moving block 19, but the overall power consumption is small and relatively energy-saving; Eighth, brush bristles can also be set on the two side walls of the moving block 19 to treat the dust on the inner wall of the centrifugal gas-liquid separator 8 and the outer wall of the air pipe 82.

[0048] As a preferred embodiment of this invention, an automatic adjustment unit is also included, which is installed on the moving block 19 and is used to control the moving block 19 to move at a uniform speed and smoothly.

[0049] As the moving block 19 moves downwards along the spiral direction on the spiral blade 81, its speed increases. Therefore, an automatic adjustment unit is provided to control the moving block 19 to move at a uniform and smooth speed. Uniform speed means that the contact time and pressure distribution between the bristles 21 and the spiral blade 81 are more even, which helps to ensure that the dust is brushed off evenly and effectively, avoiding accumulation or over-cleaning in certain areas. Uniform speed also reduces the relative speed and impact force between the bristles 21 and the spiral blade 81, thereby reducing the wear rate of the bristles, helping to extend the service life of the bristles 21, and reducing replacement and maintenance costs.

[0050] As a preferred embodiment of this example, Figure 7 As shown, the automatic adjustment unit includes an airbag 25 and a movable column 27 installed in the same movable block 19 movable cavity, and a set of rubber rollers 20 arranged near the vent pipe 82 with an annular air chamber 29 inside.

[0051] The annular air chamber 29 is connected to the connecting channel of the mounting shaft of the rubber roller 20. A rotary joint 28 is provided at the upper end of the mounting shaft, and the rotary joint 28 is connected to the airbag 25 through the connecting pipe 26.

[0052] The movable column 27 is movably disposed within the movable cavity, and the outer wall of the movable column 27 is densely covered with ball bearings.

[0053] When the moving speed of the moving block 19 increases, the squeezing pressure on the rubber roller 20 (due to centrifugal force) in contact with the inner wall of the 8 tanks of the centrifugal gas-liquid separator increases, while the squeezing pressure on the rubber roller 20 that is in close contact with the vent pipe 82 decreases. When the moving speed of the moving block 19 increases, the moving column 27 moves closer to the air bladder 25 through centrifugal force and eventually squeezes the air bladder 25, causing the air bladder 25 to expand and maintain the increased squeezing pressure on the rubber roller 20 that is in close contact with the vent pipe 82, thereby preventing the moving block 19 from moving downward too quickly. After the moving block 19 returns to its original position, the moving column 27 returns to its original position through the elastic force of the air bladder 25, which helps to maintain the uniform and stable movement of the moving block 19.

[0054] As a preferred embodiment of this invention, it also includes an angle self-adjustment unit, which is provided in four sets, each corresponding to one of the four sets of movable rollers 22. One end of the unit is disposed on the movable block 19 and the other end is disposed on the movable rollers 22, for adaptively adjusting the deflection angle of the four movable rollers 22.

[0055] The angle self-adjustment unit can adaptively change the movement path of the moving roller 22, which is beneficial for the moving block 19 to move downward spirally on the spiral blade 81, and also beneficial for the moving block 19 to move linearly on the support plate 16.

[0056] As a preferred embodiment of this example, Figure 8 As shown, the angle self-adjusting unit includes two sets of blocks 31 with universal ball bearings 32 at their outer ends, two sets of arc springs 33, and a limiting ring 34 disposed in the inner cavity of the moving block 19.

[0057] The two blocks 31 are respectively connected to the two ends of the shaft 30 of the corresponding moving roller 22. The two universal balls 32 slide against the inner wall of the limiting ring 34. The two blocks 31 are respectively fixedly connected to the moving block 19 through the arc spring 33. The bottom of the moving block 19 is provided with a deflection opening adapted to the moving roller 22.

[0058] When the moving block 19 moves on the spiral blade 81, its moving roller 22 can adjust its movement angle by rotating and compressing the arc spring 33, so that it can adapt to the spiral downward movement path. This avoids the moving block 19 experiencing excessive resistance due to the inability to adjust its angle, which would cause slow movement and hinder the rapid processing of dust blocks by the moving block 19. When the moving block 19 moves to the support plate 16, it automatically returns to its original position through the elastic force of the arc spring 33, adapting to the linear movement on the support plate 16. This facilitates the moving block 19 entering the centrifugal gas-liquid separator 8 through the upper opening 24.

[0059] It should be noted that when the moving block 19 moves at the upper end of the spiral blade 81, its moving roller 22 will deflect at an angle. This deflection will cause the part of the moving roller 22 that cuts into the dust block to exert a lateral squeezing force on the dust block, which is beneficial to loosening or crushing the dust block, and thus facilitates subsequent cleaning.

[0060] As a preferred embodiment of this invention, a vibrating unit is also included, which is disposed on the spiral blade 81 to drive the moving block 19 to vibrate and shake off the dust on the brush bristles 21.

[0061] As a preferred embodiment of this example, Figure 9 As shown, the vibrating unit includes two sets of protruding units located near the end of the spiral blade 81, and each set of protruding units has multiple sets of protrusions 84 at equal intervals.

[0062] When the moving block 19 moves to the end of the spiral blade 81 and passes the vibrating unit, it will shake. The resulting shaking will cause the dust on the brush bristles 21 to fall off and enter the air pipe 82 through the discharge opening 83, and finally enter the cyclone separator 9 for centrifugal separation.

[0063] Finally, it should be noted that the above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A centrifugal separation device for a grain dryer, comprising a centrifugal gas-liquid separator (8) with an air inlet pipe and a liquid outlet pipe, the centrifugal gas-liquid separator (8) being provided with a vent pipe (82) with an open lower end and helical vanes (81) arranged around the vent pipe (82), the vent pipe (82) being in communication with the air outlet pipe, characterized in that: The cleaning unit is arranged on the centrifugal gas-liquid separator (8) and used for removing dust agglomerates on the spiral blade (81). The cleaning unit comprises a shell (10) fixed on the outer wall of the centrifugal gas-liquid separator (8), a bidirectional screw (12) rotatably arranged in the inner cavity of the shell (10), a limiting plate (23) fixed on the upper end of the spiral blade (81), a discharging opening (83) arranged on the end of the spiral blade (81), and an upper opening (24) and a lower opening (18) arranged on the outer wall of the centrifugal gas-liquid separator (8) in a vertical manner. The lower end of the bidirectional screw (12) is fixedly connected with the output shaft of a driving motor (15) fixed on the bottom of the shell (10), a ball nut (13) is threadedly sleeved on the bidirectional screw (12), a limiting slide rod (14) and a bearing plate (16) with the upper end being arranged in a left-right high manner are fixed on the outer wall of the ball nut (13), the right end of the limiting slide rod (14) is slidably arranged in a rectangular slide groove arranged on the inner wall of the shell (10), a moving block (19) is arranged on the bearing plate (16), rubber rollers (20) are arranged on the two side ends of the moving block (19) in an inclined manner, a plurality of moving rollers (22) are arranged on the lower end of the moving block (19), the outer edges of the moving rollers (22) are arranged in a pointed manner, and a plurality of brush hairs (21) are arranged on the bottom of the moving block (19). The inner cavities of the shell (10) and the centrifugal gas-liquid separator (8) are communicated through the upper opening (24) and the lower opening (18), the inner cavities of the upper opening (24) and the lower opening (18) are provided with sealing units, the sealing units comprise a sealing plate (17) rotatably arranged, an elastic sealing layer is arranged on the outer wall of the sealing plate (17), the lower end of the sealing plate (17) abuts against a slope arranged on the bottom of the inner cavity of the corresponding opening, and the slope is connected with the end of the spiral blade (81). The lower sealing plate (17) is rotated counterclockwise, the lower opening (18) is opened, the upper sealing plate (17) is rotated clockwise, and the upper opening (24) is opened. The inclined directions and angles of the two rubber rollers (20) are consistent with the spiral direction and angle of the spiral blade (81). A humidity sensor (11) is arranged close to the gas inlet end of the centrifugal gas-liquid separator (8), and the humidity sensor (11) and the driving motor (15) are electrically connected with a controller.

2. A centrifugal separating device for a grain dryer as claimed in claim 1, characterized in that An automatic adjusting unit is arranged on the moving block (19) and used for controlling the moving block (19) to move at a uniform speed.

3. A centrifugal separating device for a grain dryer as claimed in claim 2, characterized in that: The automatic adjusting unit comprises an air bag (25) and a movable column (27) arranged in the movable cavity of the moving block (19), and a ring-shaped air cavity (29) is arranged in the rubber roller (20) close to the air pipe (82). The annular air cavity (29) is communicated with the connecting flow passage of the mounting shaft of the rubber roller (20), the upper end of the mounting shaft is provided with a rotary joint (28), and the rotary joint (28) is connected with the air bag (25) through a connecting pipe (26); The movable column (27) is movably arranged in the movable cavity, and the outer wall of the movable column (27) is densely covered with balls.

4. The centrifugal separating device for grain dryer according to claim 1, characterized in that: Further comprising an angle self-adjusting unit, provided with four groups, corresponding to the four groups of the moving rollers (22), one end is arranged on the moving block (19), the other end is arranged on the moving roller (22), for self-adaptive adjustment of the deflection angle of the four moving rollers (22).

5. A centrifugal separating device for a grain dryer as claimed in claim 4, characterized in that: The angle self-adjusting unit comprises two groups of block bodies (31) provided with universal balls (32) at the outer ends, two groups of arc springs (33) and a limiting ring (34) arranged in the inner cavity of the moving block (19); Two block bodies (31) are respectively arranged at two ends of the rotating shaft (30) corresponding to the moving roller (22), two universal balls (32) are in sliding contact with the inner wall of the limiting ring (34), two block bodies (31) are respectively fixedly connected with the moving block (19) through the arc springs (33), and the bottom of the moving block (19) is provided with a deflection opening matched with the moving roller (22).

6. The centrifugal separating device for grain dryer according to claim 1, characterized in that: Further comprising a material vibrating unit arranged on the spiral blade (81) to drive the moving block (19) to vibrate and shake off dust on the bristles (21).

7. A centrifugal separating device for a grain dryer as claimed in claim 6, characterized in that The material vibrating unit comprises two groups of protruding units arranged near the ends of the spiral blade (81), and each group of the protruding units is equally spaced and provided with a plurality of protrusions (84).

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