A grain conveying device for drying grain

Abstract

The application discloses a grain conveying device for grain drying, and relates to the technical field of grain processing. In order to solve the problem of drying efficiency, the grain conveying device comprises an auger lifting mechanism, a discharge pipe arranged at the bottom of the auger lifting mechanism, and a feeding hopper arranged at the top of the auger lifting mechanism. A conical cylinder is fixedly installed at the bottom of the discharge pipe. The conical cylinder and the interior of the discharge pipe are provided with the same set of scattering mechanisms. The scattering mechanism comprises a scattering shaft and scattering blades. The scattering blades are fixedly installed on the side wall of the scattering shaft. The top of the scattering shaft is connected with a motor one through a shaft coupling for driving the rotation of the scattering shaft. The scattering mechanism can apply a rotary motion to the grain when the grain freely falls, so that the centrifugal force generated by the rotary motion and the characteristics that the rotary linear velocities at different positions are inconsistent are utilized to realize the scattering and uniform arrangement of the grain in the conical cylinder, thereby increasing the gap between the grain particles and improving the subsequent drying effect.

Description

Technical Field

[0001] This invention relates to the field of grain processing technology, and in particular to a grain conveying device for grain drying. Background Technology

[0002] During the grain processing, the grain must be dried before packaging to prevent it from sprouting or becoming moldy during storage.

[0003] In existing technologies, during grain drying, an auger is used to lift and transport the grain, which is then fed into a drying tower where hot air is used to dry the moisture in the grain.

[0004] A search revealed a Chinese patent publication number CN218531030U, which discloses a lifting machine for grain processing. The machine includes a lifting cylinder, with a first support and a second support on the bottom sides of the cylinder. Inside the cylinder is a first rotating shaft driven by a motor installed at one end. The surface of the first rotating shaft is provided with a first spiral blade. A discharge pipe is provided at the relatively high bottom of the cylinder. A feed box is connected to the top of the first support. The bottom of the feed box is connected to the inner cavity of the cylinder through a discharge pipe. The feed box is fed by a feeding mechanism. A filter mechanism for filtering grain dust is provided on one side of the feed box.

[0005] The aforementioned patent has the following shortcomings: after lifting the grain, it directly discharges the grain through the discharge pipe. At this time, the grain is relatively concentrated, which makes the drying effect of the grain located inside poor during subsequent drying.

[0006] Therefore, the present invention proposes a grain conveying device for grain drying. Summary of the Invention

[0007] The purpose of this invention is to address the shortcomings of existing technologies by proposing a grain conveying device for grain drying.

[0008] To achieve the above objectives, the present invention adopts the following technical solution:

[0009] A grain conveying device for grain drying includes an auger lifting mechanism, a discharge pipe disposed at the bottom above the auger lifting mechanism, and a feed hopper disposed at the top below the auger lifting mechanism. A conical cylinder is fixedly installed at the bottom of the discharge pipe, and the same set of dispersing mechanisms are provided inside the conical cylinder and the discharge pipe.

[0010] The disintegration mechanism includes a disintegration shaft and disintegration blades. The disintegration blades are fixedly installed on the side wall of the disintegration shaft. The top of the disintegration shaft is connected to a motor for driving its rotation via a coupling. The motor is fixedly installed on the top of the auger lifting mechanism.

[0011] Preferably, the dispersing mechanism further includes a uniformity sensing mechanism disposed on the inner circumferential wall of the bottom of the conical cylinder. The uniformity sensing mechanism includes a cross-shaped hollow tube fixed to the inner circumferential wall of the bottom of the conical cylinder, an impact sensing element 2 disposed at the center of the cross-shaped hollow tube, and multiple sets of impact sensing elements 1 disposed around the cross-shaped hollow tube.

[0012] Furthermore, the second impact sensor includes a cylinder liner fixedly installed on the top of the hollow cross tube and communicating with the inner cavity of the hollow cross tube, a piston liner slidably fitted in the inner cavity of the cylinder liner, and an impact plate fixed to the top of the piston liner via a connecting rod.

[0013] Based on the aforementioned scheme: the impact sensing element includes a cylinder liner 2 fixedly installed on the top of the cross-shaped hollow tube and communicating with the inner cavity of the cross-shaped hollow tube, a piston 2 slidably fitted in the inner cavity of the cylinder liner 2, and an impact plate 2 fixed to the top of the piston 2 by a connecting rod.

[0014] A better option among the aforementioned solutions is that multiple sets of impact sensors are arranged in a circular array relative to impact sensors, and the sum of the top surface areas of all the impact plates is equal to the top surface area of ​​impact plate one.

[0015] As a further aspect of the present invention: a resistance rod is fixed in the inner cavity of the cross-shaped hollow tube, and a hollow conductive plug is electrically conductive and slidably connected to the outer wall of the resistance rod. The outer circumferential wall of the hollow conductive plug is slidably connected to the inner wall of the cross-shaped hollow tube. The outer end of the resistance rod and the hollow conductive plug are both connected to the same power source through wires.

[0016] Meanwhile, the auger lifting mechanism includes a housing, an end cover fixedly installed at the end of the housing, a main shaft rotatably connected to the inner wall of the end cover, and spiral blades fixedly installed on the outer wall of the main shaft. A second motor is fixedly installed on the outer wall of the end cover, and the output shaft of the second motor is connected to the outer wall of the main shaft through a coupling.

[0017] As a preferred embodiment of the present invention, a flexible spiral pad is fixed to the outer wall of the spiral blade, and the flexible spiral pad is in contact with the inner cavity of the shell.

[0018] Meanwhile, a tray is fixedly installed on the top outer wall of the auger lifting mechanism, and a control cabinet is fixed to the side wall of the tray by a bracket.

[0019] As a preferred embodiment of the present invention: the motor is controlled by a frequency converter, which is fixedly installed on the top outer wall of the tray;

[0020] The frequency tuning knob of the frequency tuner is fixedly connected to a gear on its outer wall. A rack meshes with the bottom outer wall of the gear. The rack is slidably connected to the outer wall of the tray, and a position control component is provided at the end of the rack.

[0021] The position control component includes a spring fixedly installed on the side of the tray opposite to the rack, and a permanent magnet fixed to the other end of the rack. An electromagnet is used in conjunction with one side of the permanent magnet. The magnetic poles of the permanent magnet and the electromagnet are the same on the opposite side. The electromagnet is fixed to the inner wall of the tray.

[0022] The electromagnet is connected in series in the circuit of the hollow conductive plug and the resistance rod.

[0023] The beneficial effects of this invention are as follows:

[0024] 1. The present invention, by setting up a dispersing mechanism, can apply rotational motion to the grain when it falls freely, thereby utilizing the centrifugal force generated by the rotational motion and the inconsistent linear velocity of rotation at different positions to disperse and evenly distribute the grain in the conical cylinder, thereby increasing the gap between grain particles and improving the subsequent drying effect.

[0025] 2. This invention, by setting up a uniformity sensing mechanism, utilizes the characteristics of impact combined with the law of conservation of momentum. By monitoring the force on impact plate one and impact plate two, the density of grain particles can be monitored. Furthermore, considering the characteristic that the higher the rotation speed of the dispersing blades, the more the grains gather on the outside, the rotation speed of the dispersing blades can be controlled by monitoring the density to achieve uniformity of grain particle density within the conical cylinder cross-section, thereby further improving the subsequent drying efficiency.

[0026] 3. This invention, by setting a hollow conductive plug and a resistance rod, utilizes the gas pressure transmission characteristics and the resistivity distribution characteristics of the optical rod to detect the magnitude of the force on impact plate one and impact plate two by monitoring the current, making the detection results accurate and the monitoring method more convenient.

[0027] 4. In this invention, by setting a flexible spiral pad, the gap between the spiral blade and the flexible spiral pad is flexibly filled. On the one hand, this can prevent the grain from falling out of the gap during lifting and conveying, thus increasing the conveying efficiency. On the other hand, it can also prevent the outermost part of the spiral blade from "cutting" the grain, thereby preventing the grain from breaking and increasing the conveying effect.

[0028] 5. In this invention, by setting a flexible spiral pad, the gap between the spiral blade and the flexible spiral pad is flexibly filled. On the one hand, this can prevent the grain from falling out of the gap during lifting and conveying, thus increasing the conveying efficiency. On the other hand, it can also prevent the outermost part of the spiral blade from "cutting" the grain, thereby preventing the grain from breaking and increasing the conveying effect.

[0029] 6. In this invention, the position control component is supported by a spring on one side and set by the magnetic repulsion between a permanent magnet and an electromagnet on the other side. The electromagnet is directly connected in series in the circuit of the hollow conductive plug and the resistance rod. The electromagnet can directly sense the magnitude of the current, thereby reducing the control link and increasing the response speed. Attached Figure Description

[0030] Figure 1 This is a schematic diagram of the overall structure of a grain conveying device for grain drying proposed in this invention.

[0031] Figure 2 This is a cross-sectional schematic diagram of the dispersing mechanism of a grain conveying device for grain drying proposed in this invention.

[0032] Figure 3 This is a schematic diagram of the front view of a uniformity sensing mechanism for a grain conveying device used for grain drying, as proposed in this invention.

[0033] Figure 4 This is a cross-sectional schematic diagram of the uniformity sensing mechanism of a grain conveying device for grain drying proposed in this invention.

[0034] Figure 5 This is a schematic diagram of the circuit structure of a grain conveying device for grain drying proposed in this invention;

[0035] Figure 6 This is a cross-sectional schematic diagram of the auger lifting mechanism of a grain conveying device for grain drying proposed in this invention;

[0036] Figure 7 This is a partial structural schematic diagram of a grain conveying device for grain drying proposed in this invention;

[0037] Figure 8 This is an enlarged structural schematic diagram of part A of a grain conveying device for grain drying proposed in this invention;

[0038] Figure 9 This is an enlarged structural diagram of part B of a grain conveying device for grain drying proposed in this invention.

[0039] In the diagram: 1-Auger lifting mechanism, 2-Conical cylinder, 3-Discharge pipe, 4-Dispersion mechanism, 5-Feed hopper, 6-Motor I, 7-Dispersion shaft, 8-Uniformity sensing mechanism, 9-Dispersion blade, 10-Cross hollow tube, 11-Impact sensor II, 12-Impact sensor I, 13-Piston I, 14-Impact plate I, 15-Cylinder liner I, 16-Impact plate II, 17-Piston II, 18-Cylinder liner II, 19-Hollow conductive plug, 20-Resistance rod, 21-Wire, 22-Power supply, 23-Housing shell, 24-Flexible spiral pad, 25-Spiral blade, 26-End cap, 27-Motor II, 28-Main shaft, 29-Plate, 30-Rack, 31-Gear, 32-Frequency tuner, 33-Frequency tuning knob, 34-Bracket, 35-Control cabinet, 36-Permanent magnet, 37-Electromagnet, 38-Spring. Detailed Implementation

[0040] The technical solution of this patent will be further described in detail below with reference to specific embodiments.

[0041] The embodiments of this patent are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this patent, and should not be construed as limiting this patent.

[0042] Example 1:

[0043] A grain conveying device for grain drying, such as Figure 1-9 As shown, it includes a screw conveyor lifting mechanism 1 and a discharge pipe 3 located at the bottom above the screw conveyor lifting mechanism 1 and a feed hopper 5 located at the top below the screw conveyor lifting mechanism 1. The bottom of the discharge pipe 3 is fixed with a conical cylinder 2 by bolts. The conical cylinder 2 and the discharge pipe 3 are equipped with the same set of dispersing mechanisms 4.

[0044] The dispersing mechanism 4 includes a dispersing shaft 7 and dispersing blades 9. The dispersing blades 9 are welded to the side wall of the dispersing shaft 7. The top of the dispersing shaft 7 is connected to a motor 6 for driving its rotation via a coupling. The motor 6 is fixed to the top of the auger lifting mechanism 1 by bolts.

[0045] When the motor 6 rotates, it can drive the dispersing blades 9 to rotate through the dispersing shaft 7, thereby agitating the grain that is descending along the discharge pipe 3.

[0046] This device, by setting up a dispersing mechanism 4, can apply rotational motion to the grain when it falls freely. By utilizing the centrifugal force generated by the rotational motion and the inconsistent linear velocity of rotation at different positions, the grain is dispersed and evenly distributed in the conical cylinder 2, thereby increasing the gap between grain particles and improving the subsequent drying effect.

[0047] To solve the uniformity sensing problem; such as Figure 2-5 As shown, the dispersing mechanism 4 also includes a uniformity sensing mechanism 8 disposed on the inner circumferential wall of the bottom of the conical cylinder 2. The uniformity sensing mechanism 8 includes a cross-shaped hollow tube 10 fixed to the inner circumferential wall of the bottom of the conical cylinder 2, an impact sensing element 2 11 disposed at the center of the cross-shaped hollow tube 10, and multiple sets of impact sensing elements 12 disposed around the cross-shaped hollow tube 10. The multiple sets of impact sensing elements 12 are arranged in a circular array relative to the impact sensing element 2 11.

[0048] The impact sensing element 2 11 includes a cylinder liner 15 welded to the top of the cross-shaped hollow tube 10 and communicating with the inner cavity of the cross-shaped hollow tube 10, a piston 13 slidably fitted into the inner cavity of the cylinder liner 15, and an impact plate 14 fixed to the top of the piston 13 by a connecting rod.

[0049] The impact sensing element 12 includes a cylinder liner 18 welded to the top of the cross-shaped hollow tube 10 and communicating with the inner cavity of the cross-shaped hollow tube 10, a piston 17 slidably fitted into the inner cavity of the cylinder liner 18, and an impact plate 16 fixed to the top of the piston 17 by a connecting rod.

[0050] The sum of the top surface areas of all the impact plates 16 is equal to the top surface area of ​​the impact plate 14.

[0051] A resistance rod 20 is fixed in the inner cavity of the cross-shaped hollow tube 10. A hollow conductive plug 19 is electrically conductive and slidably connected to the outer wall of the resistance rod 20. The outer circumferential wall of the hollow conductive plug 19 is slidably connected to the inner wall of the cross-shaped hollow tube 10.

[0052] The outer end of the resistance rod 20 and the hollow conductive plug 19 are both connected to the same power source 22 via wires 21.

[0053] When the grain is broken up and falls, it will impact impact plates 14 and 16, generating an impact force on them. This impact force causes impact plates 14 and 16 to move downwards. When the magnitude of the force on impact plates 14 and 16 is different, it creates a different pressure on the air inside the hollow cross tube 10, causing the hollow conductive plug 19 to shift. Since the hollow conductive plug 19 is electrically connected to the resistance rod 20, the displacement of the hollow conductive plug 19 relative to the resistance rod 20 changes the resistance in the circuit containing the hollow conductive plug 19 and the resistance rod 20, thus changing the current. The increase or decrease in current can be used to determine the density of grain particles from the center to the periphery of the entire conical tube 2 cross section, thereby judging the uniformity of the breaking up.

[0054] The following is a stress analysis of the above density judgment, and the density of grain particles is defined as the number of grain particles contained in a unit cross section of the conical cylinder 2.

[0055] Force Analysis: Since the grain collides with impact plates 14 and 16, and experiences almost no longitudinal force during its fall, the vertical motion of all grain particles can be considered completely uniform. Applying the law of conservation of momentum Ft=mΔV, the forces acting on impact plates 14 and 16 can be... Combining this with the law of conservation of momentum, we can know that , where i is the total number of grains that collided.

[0056] Based on the above, assuming that each grain has the same weight, we can obtain... Where M is the average weight of each grain of grain, and n is the total number of grains involved in the collision, then we can obtain... It is directly proportional to the first power of n.

[0057] Combined with instantaneous analysis, Where ρ is the density of the grain particles and S is the collision area, then we can know that... It is directly proportional to ρ to the power of 1.

[0058] In summary, the density of grain particles can be monitored by monitoring the force exerted on impact plate 14 and impact plate 2 16.

[0059] This device, by setting up a uniformity sensing mechanism 8, utilizes the characteristics of impact combined with the law of conservation of momentum. By monitoring the force on impact plate 14 and impact plate 16, the density of grain particles can be monitored. Combined with the characteristic that the higher the rotation speed of the dispersing blades 9, the more the grains gather to the outside, the rotation speed of the dispersing blades 9 can be controlled by monitoring the density to achieve uniformity of grain particle density within the cross-section of the conical cylinder 2, thereby further improving the subsequent drying efficiency.

[0060] Furthermore, by setting up a hollow conductive plug 19 and a resistance rod 20, this device utilizes the gas pressure transmission characteristics and the resistivity distribution characteristics of the optical rod to detect the force on the impact plate 14 and the impact plate 26 by monitoring the current, making the detection results accurate and the monitoring method more convenient.

[0061] To solve the transportation problem; such as Figure 6 As shown, the auger lifting mechanism 1 includes a housing 23, an end cover 26 fixed to the end of the housing 23 by bolts, a main shaft 28 rotatably connected to the inner wall of the end cover 26, and a spiral blade 25 welded to the outer wall of the main shaft 28. A second motor 27 is fixed to the outer wall of the end cover 26 by bolts, and the output shaft of the second motor 27 is connected to the outer wall of the main shaft 28 by a coupling.

[0062] When motor 27 starts, it can drive the spiral blades 25 to rotate through the main shaft 28, thereby realizing the transport of grain.

[0063] To address the issues of conveying efficiency and conveying effect; such as Figure 6 As shown, a flexible spiral pad 24 is fixed to the outer wall of the spiral blade 25, and the flexible spiral pad 24 is in contact with the inner cavity of the housing 23.

[0064] By setting a flexible spiral pad 24, the gap between the spiral blade 25 and the flexible spiral pad 24 is flexibly filled. On the one hand, it can prevent the grain from falling out of the gap during lifting and conveying, thus increasing the conveying efficiency. On the other hand, it can also prevent the outermost part of the spiral blade 25 from "cutting" the grain, thereby preventing the grain from breaking and increasing the conveying effect.

[0065] To solve control problems; such as Figure 7 As shown, the top outer wall of the auger lifting mechanism 1 is fixed with a tray 29 by bolts, and the side wall of the tray 29 is fixed with a control cabinet 35 by a bracket 34; the device can be controlled through the control cabinet 35.

[0066] In this embodiment, grain can be placed into the auger lifting mechanism 1 through the feed hopper 5. The motor 27 is started. When the motor 27 starts, it can drive the spiral blades 25 to rotate through the main shaft 28, thereby lifting and transporting the grain. Then the grain falls freely from the discharge pipe 3. At this time, the motor 6 is started. The motor 6 drives the dispersing blades 9 to rotate through the dispersing shaft 7. The dispersing blades 9 agitate the grain and apply rotational motion to the grain. The centrifugal force generated by the rotational motion makes the grain disperse and spread evenly in all directions. The dispersed grain continues to fall and will hit the impact plate 14 and the impact plate 26, thereby generating a downward force on the impact plate 14 and the impact plate 26. Then, the hollow conductive plug 19 is moved through air pressure transmission, thereby changing the current in the circuit circuit formed by the hollow conductive plug 19 and the resistance rod 20. The increase and decrease of the current and the magnitude of the increase and decrease are fed back to the motor 6 for speed control.

[0067] Example 2:

[0068] A grain conveying device for grain drying, such as Figure 7 As shown, in order to solve the feedback control problem, this embodiment makes the following improvements based on embodiment 1: the motor 6 is connected to a frequency modulator 32, which is fixed to the top outer wall of the tray 29 by bolts. The input frequency of the motor 6 can be controlled by the frequency modulator 32, thereby controlling the rotation speed.

[0069] The tuning knob 33 of the tuning instrument 32 is fixedly connected to a gear 31 on its outer wall. A rack 30 is meshed with the bottom outer wall of the gear 31. The rack 30 is laterally slidably connected to the outer wall of the tray 29, and a position control component is provided at the end of the rack 30.

[0070] The position control component includes a spring 38 welded to the opposite side of the tray 29 and the rack 30, and a permanent magnet 36 fixed to the other end of the rack 30. An electromagnet 37 is used in conjunction with one side of the permanent magnet 36. The magnetic poles of the permanent magnet 36 and the electromagnet 37 are the same on the opposite side. The electromagnet 37 is fixed to the inner wall of the tray 29.

[0071] Furthermore, the electromagnet 37 is connected in series in the circuit of the hollow conductive plug 19 and the resistance rod 20.

[0072] In this embodiment, when the hollow conductive plug 19 slides relative to the resistance rod 20, its current changes, thereby changing the current of the electromagnet 37. This changes the repulsive force between the permanent magnet 36 and the electromagnet 37. Combined with the elastic support of the spring 38, this changes the position of the rack 30. When the position of the rack 30 changes, it can rotate the frequency tuning knob 33 through meshing with the gear 31, thereby adjusting the input frequency of the frequency tuner 32.

[0073] This device, by setting a rack 30 and a position control component, allows the position control component to sense the current when the hollow conductive plug 19 slides against the resistance rod 20, thereby adjusting the position of the rack 30 and rotating the frequency tuning knob 33 of the frequency tuner 32, thus achieving automatic feedback adjustment.

[0074] In addition, the position control component of this device is elastically supported by a spring 38 on one side and set by the magnetic repulsion between a permanent magnet 36 and an electromagnet 37 on the other side. The electromagnet 37 is directly connected in series in the circuit of the hollow conductive plug 19 and the resistance rod 20. The electromagnet 37 can directly sense the magnitude of the current, thereby reducing the control link and increasing the response speed.

[0075] The above description is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. A grain conveying device for grain drying, comprising an auger lifting mechanism (1) and a discharge pipe (3) disposed at the bottom above the auger lifting mechanism (1), and a feed hopper (5) disposed at the top below the auger lifting mechanism (1), characterized in that, A conical cylinder (2) is fixedly installed at the bottom of the discharge pipe (3), and the same set of dispersing mechanism (4) is provided inside the conical cylinder (2) and the discharge pipe (3). The dispersing mechanism (4) includes a dispersing shaft (7) and dispersing blades (9). The dispersing blades (9) are fixedly installed on the side wall of the dispersing shaft (7). The top of the dispersing shaft (7) is connected to a motor (6) for driving its rotation via a coupling. The motor (6) is fixedly installed on the top of the auger lifting mechanism (1). The dispersing mechanism (4) further includes a uniformity sensing mechanism (8) disposed on the inner circumferential wall of the bottom of the conical cylinder (2). The uniformity sensing mechanism (8) includes a cross hollow tube (10) fixed to the inner circumferential wall of the bottom of the conical cylinder (2), and impact sensing element two (11) disposed at the center of the cross hollow tube (10) and multiple sets of impact sensing elements one (12) disposed around the cross hollow tube (10). The impact sensing element 2 (11) includes a cylinder liner 1 (15) fixedly installed on the top of the cross hollow tube (10) and communicating with the inner cavity of the cross hollow tube (10), a piston 1 (13) slidably fitted in the inner cavity of the cylinder liner 1 (15), and an impact plate 1 (14) fixed to the top of the piston 1 (13) by a connecting rod. The impact sensing element one (12) includes a cylinder liner two (18) fixedly installed on the top of the cross hollow tube (10) and communicating with the inner cavity of the cross hollow tube (10), a piston two (17) slidably fitted in the inner cavity of the cylinder liner two (18), and an impact plate two (16) fixed to the top of the piston two (17) by a connecting rod. Multiple sets of impact sensors one (12) are arranged in a circular array relative to impact sensors two (11), and the sum of the top surface areas of all impact plates two (16) is equal to the top surface area of ​​impact plate one (14). A resistance rod (20) is fixed in the inner cavity of the cross-shaped hollow tube (10). The outer wall of the resistance rod (20) is electrically conductive and is slidably connected to a hollow conductive plug (19). The outer circumferential wall of the hollow conductive plug (19) is slidably connected to the inner wall of the cross-shaped hollow tube (10). The outer end of the resistance rod (20) and the hollow conductive plug (19) are both connected to the same power source (22) through a wire (21).

2. The grain conveying device for grain drying according to claim 1, characterized in that, The auger lifting mechanism (1) includes a housing (23), an end cover (26) fixedly installed at the end of the housing (23), a main shaft (28) rotatably connected to the inner wall of the end cover (26), and a spiral blade (25) fixedly installed on the outer wall of the main shaft (28). A second motor (27) is fixedly installed on the outer wall of the end cover (26), and the output shaft of the second motor (27) is connected to the outer wall of the main shaft (28) through a coupling.

3. A grain conveying device for grain drying according to claim 2, characterized in that, The outer wall of the spiral blade (25) is fixed with a flexible spiral pad (24), which is in contact with the inner cavity of the shell (23).

4. A grain conveying device for grain drying according to claim 1, characterized in that, The top outer wall of the auger lifting mechanism (1) is fixedly installed with a tray (29), and the side wall of the tray (29) is fixed with a control cabinet (35) by a bracket (34).

5. A grain conveying device for grain drying according to claim 4, characterized in that, The motor (6) is connected to a frequency tuner (32), which is fixedly installed on the top outer wall of the tray (29); The tuning knob (33) of the tuning instrument (32) is fixedly connected to a gear (31) on its outer wall. A rack (30) meshes with the bottom outer wall of the gear (31). The rack (30) is laterally slidably connected to the outer wall of the tray (29), and a position control component is provided at the end of the rack (30). The position control component includes a spring (38) fixedly installed on the opposite side of the tray (29) and the rack (30), and a permanent magnet (36) fixed on the other end of the rack (30). An electromagnet (37) is used in conjunction with one side of the permanent magnet (36). The magnetic poles of the permanent magnet (36) and the electromagnet (37) are the same on the opposite side. The electromagnet (37) is fixed to the inner wall of the tray (29). The electromagnet (37) is connected in series in the circuit of the hollow conductive plug (19) and the resistance rod (20).

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