Grain delivery device for a grain dryer

Abstract

The present application relates to the technical field of grain conveying device, in particular to a grain conveying device for grain dryer, which comprises a vertical conveying cavity arranged in the inside of the frame body, a driving shaft rotatably installed on the upper and lower ends of the conveying cavity through a bearing seat, and a fixed gear on the driving shaft; the magnetic attraction assembly comprises a magnet plate and an electromagnet plate matched with each other, the control module is electrically connected with the electromagnet plate, and the electromagnet plate can be controlled to switch between magnetic attraction and repulsion force states; dual-mode flexible switching: through the accurate control of the magnetic attraction assembly, the efficient conveying mode and the impurity removal and drying mode can be quickly switched, the conveying efficiency demand in the large-capacity drying scene is met, and the impurity removal effect in the high-quality drying scene is ensured; online impurity removal and dust removal are cooperated, dust pollution is low: after the grain in the hopper is stirred and dust is raised, the air exhaust fans arranged on the both sides are synchronously used to exhaust air, the dust is collected by the dust collecting bag / dust collecting pipeline, and the working environment is effectively improved.

Description

Technical Field

[0006]

[0001] The present invention relates to the technical field of grain transportation, and particularly to a grain conveying device for a grain dryer. Background Art

[0002] The conveying devices supporting existing grain dryers mainly have the following technical defects:

[0003] The conveying efficiency and quality cannot be兼顾: Traditional scraper conveyors and belt conveyors can only achieve a single conveying function and cannot remove impurities from grains online while improving the conveying efficiency. When the demand for drying capacity increases, the impurity content of the grains also increases; if the impurity removal quality needs to be ensured, the conveying speed needs to be reduced, resulting in a decrease in the overall drying efficiency;

[0004] The problems of卸料残留 and grain breakage are prominent: The hoppers of existing hopper-type conveying devices mostly have a fixed volume structure and rely on gravity to slide naturally during unloading. The residual rate is generally higher than 5%, which is prone to causing material accumulation and blockage; and there is no buffer bearing structure at the bottom, and the breakage rate of grains during falling can reach more than 3%, affecting the quality of the grains after drying.

[0005] The performance of the magnetic attraction adjustment structure is insufficient: Some conveying devices with magnetic attraction adjustment have defects such as lagging magnetic attraction response and low volume adjustment accuracy, and cannot accurately adapt to the dual-mode switching requirements of efficient conveying and impurity removal and drying; and the replacement of the hopper power supply module is inconvenient, and the conveying device needs to be disassembled, resulting in low maintenance efficiency.

[0006] The coordination of the dust removal system is poor: Existing dust removal devices are mostly independently set and have no coordinated linkage with the impurity removal action during the conveying process. After the dust is raised, it cannot be timely evacuated, resulting in serious dust pollution at the site and exceeding the dust concentration standard, affecting the health of operating personnel. Summary of the Invention

[0007] In view of this, the purpose of the present invention is to provide a grain conveying device for a grain dryer to solve the problems in the prior art. <……>Based on the above purpose, the present invention provides a grain conveying device for a grain dryer, including a frame body, a feeding mechanism, a roller conveying chain, a magnetic attraction component, a hopper and a control module.

[0009] A vertical conveying cavity is provided inside the frame body. The upper and lower ends of the conveying cavity are rotationally installed with a driving shaft through bearing seats. A gear is fixed on the driving shaft, and the upper and lower gears are meshed and driven by a roller conveying chain. The hopper is connected to the roller conveying chain through a shaft rod and moves cyclically along the conveying cavity with the chain;

[0010] The magnetic attraction component includes a magnet plate and an electromagnet piece that cooperate with each other. The control module is electrically connected to the electromagnet piece and can control the electromagnet piece to switch between the magnetic attraction / repulsion states to achieve two working modes: It should be noted that the text you provided seems to be incomplete. There are some parts with "……" in the original Chinese text. If you can provide the complete content, I will be able to give a more accurate translation. Also, the Chinese term "兼顾" in ID=11 is translated as "兼顾" in the English translation for now as it is not clear what the exact intended English word is. You may need to correct it according to the actual situation. And the term "卸料残留" in ID=14 is also translated as the literal Chinese term for now as it's not clear what the proper English expression should be.

[0011] In rapid conveying mode, the electromagnet plate and the magnetic plate attract each other to adjust the volume of the hopper. When unloading, the repulsive force pushes the hopper to unload quickly.

[0012] In the impurity removal mode, the electromagnet plate and the magnetic plate periodically switch between magnetic attraction and repulsion, causing the hopper to vibrate and the grain to tumble and remove impurities, which, together with the dust removal structure, completes the dust collection.

[0013] Preferably, the hopper is an open structure formed by stamping 304 stainless steel, with polished inner wall.

[0014] The rubber sheet is made of nitrile rubber.

[0015] Preferably, the magnet plate is a neodymium iron boron permanent magnet with a nickel-plated surface for rust prevention;

[0016] The fit between the electromagnet sheet and the magnet plate is 0.2 mm.

[0017] Preferably, the lithium battery assembly of the control module is a ternary lithium battery pack;

[0018] The 5G communication module supports remote command issuance and status data upload.

[0019] Preferably, the gear is made of 45# steel with heat treatment; the roller conveyor chain is a roller chain structure, and a tensioning wheel is provided at the bottom of the frame body to maintain tension.

[0020] Preferably, exhaust fans are arranged alternately on both sides of the main frame. The exhaust fans are axial flow fans, and the air outlet is equipped with a detachable dust collection bag. If necessary, a dust collection pipe can be connected to achieve centralized dust discharge.

[0021] Preferably, a rectangular processing cavity is provided below the exhaust fan on one side of the main frame, and the cavity is equipped with a sealed maintenance door for cleaning the fan filter and replacing the lithium battery components in the hopper.

[0022] Preferably, the bottom of the conveying chamber is provided with four sets of elastic telescopic frames, each consisting of a high-strength cylindrical spring and a guide rod. A frame is provided at the top of the elastic telescopic frame for adjusting the height of the grain being carried.

[0023] Preferably, the feeding mechanism is equipped with a stainless steel mesh tube, and an eccentric wheel type vibration motor is installed at the top of the mesh tube;

[0024] The pipe wall is evenly opened with material leakage ports, and the outside of the pipe is equipped with a feeding hood and an outer support frame. Centrifugal fans are evenly installed on the outer support frame.

[0025] Preferably, the contact surface between the outer support frame and the feed hood is provided with a neodymium iron boron magnet ring to enable quick disassembly and cleaning of the feed hood.

[0026] The beneficial effects of the present invention are as follows: The present invention provides a grain conveying device for a grain dryer, which can be flexibly switched between two modes to meet diverse needs: Through the precise control of the magnetic suction component, it can quickly switch between high-efficiency conveying mode and impurity removal and drying mode, which can meet the conveying efficiency requirements of large-capacity drying scenarios and ensure the impurity removal effect of high-quality drying scenarios.

[0027] Online impurity removal and dust removal work together, resulting in low dust pollution: After the grains in the hopper tumble and raise dust, the exhaust fans arranged in a staggered pattern on both sides simultaneously draw away the air, and the dust is collected in a concentrated manner with the dust collection bags / dust collection pipes, effectively improving the working environment.

[0028] Modular design and convenient maintenance, low operation and maintenance costs: The feeding mechanism, hopper components and dust removal module are all independent modular structures. The rectangular processing cavity can quickly replace batteries and clean fans, improving maintenance efficiency by 30% and reducing equipment downtime. Attached Figure Description

[0029] To more clearly illustrate the technical solutions in this invention 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 for this invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0030] Figure 1 This is a schematic diagram of the overall three-dimensional structure of the present invention;

[0031] Figure 2 This is a partial cross-sectional view of the present invention;

[0032] Figure 3 For the present invention Figure 2 Enlarged structural diagram of region A in the middle;

[0033] Figure 4 This is a three-dimensional structural diagram of the hopper and other components of the present invention;

[0034] Figure 5 This is an enlarged schematic diagram of the feeding structure of the present invention.

[0035] The diagram is marked as follows:

[0036] 1. Main frame; 11. Processing chamber opening; 12. Exhaust fan; 13. Drive shaft; 14. Gear; 16. Elastic telescopic frame; 17. Frame body; 2. Feeding mechanism; 21. Conveying pipe; 22. External support frame; 23. Fan; 24. Feed hood; 25. Magnetic ring; 26. Discharge port; 27. Vibrating motor; 28. Mesh tube; 3. Roller conveyor chain; 32. First shaft; 33. Support plate; 34. Magnetic plate; 35. Sleeve; 36. Second shaft; 37. Hopper; 38. Rubber sheet; 39. Electromagnetic sheet. Detailed Implementation

[0037] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to specific embodiments.

[0038] It should be noted that, unless otherwise defined, the technical or scientific terms used in this invention should have the ordinary meaning understood by one of ordinary skill in the art to which this invention pertains. The terms "first," "second," and similar terms used in this invention do not indicate any order, quantity, or importance, but are merely used to distinguish different components. Terms such as "comprising" or "including" mean that the element or object preceding the word encompasses the elements or objects listed following the word and their equivalents, without excluding other elements or objects. Terms such as "connected" or "linked" are not limited to physical or mechanical connections, but can include electrical connections, whether direct or indirect. Terms such as "upper," "lower," "left," and "right" are used only to indicate relative positional relationships; when the absolute position of the described object changes, the relative positional relationship may also change accordingly.

[0039] Example 1:

[0040] like Figure 1-5 As shown, this embodiment provides a grain conveying device for a grain dryer, including a frame body 1, a feeding mechanism 2, and a roller conveying chain 3. The frame body 1 is a vertical hollow steel structure with a rectangular conveying cavity opened vertically inside. The drive shaft 13 is rotatably installed in the bearing seats at the upper and lower ends of the inner wall of the conveying cavity through deep groove ball bearings. The sealing rating of the deep groove ball bearing is IP65, which is suitable for the humid and hot working environment of the drying workshop.

[0041] The two ends of the drive shaft 13 are connected and fixedly mounted with gears 14 by flat keys. The gears 14 are made of 45# steel and are heat-treated. The tooth surface is treated by high frequency quenching and the hardness reaches HRC58-62. The gears 14 on the upper and lower sides are meshed and driven by roller conveyor chains 3. In every four sets of parallel roller conveyor chains 3, the first shaft 32 and the second shaft 36 are coaxially fixed at the pin positions of the second and fourth chain links, respectively.

[0042] The outer wall of the first shaft 32 is fitted with an interference fit collar, and the outer wall of the collar is fixedly connected to one end of the support plate 33 by a full welding process; a metal substrate is fastened to the upper surface of the support plate 33 by bolts, and a fixed magnet plate 34 is embedded in the middle of the substrate. The magnet plate 34 is a neodymium iron boron permanent magnet with nickel plating for rust prevention and a magnetic field strength ≥800GS.

[0043] An aluminum alloy sleeve 35 is fitted onto the outer wall of the second shaft 36 with a clearance fit. The outer wall of the sleeve 35 is fixed to the side wall of the hopper 37 by argon arc welding. The hopper 37 is an open structure formed by stamping 304 stainless steel. Its inner wall is polished and the surface roughness Ra≤0.8μm to avoid grain residue sticking to the wall. The lower surface of the hopper 37 is sealed by two rubber sheets 38. The thickness of the rubber sheets 38 is 5mm and the elastic deformation rate is ≥30%. An electromagnet sheet 39 is fixedly adhered in the rectangular gap formed between the two sets of rubber sheets 38. The magnetic attraction response time of the electromagnet sheet 39 is ≤0.1s and the magnetic attraction gap with the magnet plate 34 is ≤0.2mm.

[0044] The side wall of the hopper 37 is embedded with a lithium battery pack, an STM32 series microcontroller, and an industrial-grade 5G communication module. The lithium battery pack is an 18650 ternary lithium battery pack with a rated voltage of 12V and a battery life of ≥72h. The 5G communication module establishes a two-way data connection with the remote control platform through the 5G network to receive the magnetic attraction / repulsion switching command of the electromagnet plate 39 issued by the control platform, and simultaneously uploads the position and operating status data of the hopper 37.

[0045] Control function implementation

[0046] 1. High-efficiency conveying mode: In operation scenarios where improved conveying efficiency is required, the remote control platform issues a magnetic attraction command, and the electromagnet 39 is energized to generate a magnetic field in the same direction as the magnet plate 34. The two attract each other, causing the rubber sheet 38 to deform elastically, thereby increasing the effective volume of the hopper 37 by 30%. When the hopper 37 runs with the roller conveyor chain 3 to the lower section of the top of the frame body 1, the control platform issues a repulsive force command, and the electromagnet 39 switches the direction of the magnetic field, generating a repulsive force with the magnet plate 34, pushing the hopper 37 to tilt and unload quickly. At the same time, due to the repulsive force, the grain in the hopper is thrown out, increasing the successful unloading amount and reducing the unloading residue rate to below 1%, thus reducing the accumulation of materials in the frame body 1.

[0047] 2. Impurity Removal Mode: In operation scenarios where the quality requirements for grain drying and impurity removal are high and the conveying speed does not need to be too fast, after the grain falls into the hopper 37 through the feeding mechanism, the control platform issues a periodic magnetic attraction / repulsion switching command. The electromagnet plate 39 and the magnet plate 34 alternately switch between attraction and repulsion at a frequency of 2Hz, causing the hopper 37 to vibrate slightly back and forth, so that the grain in the hopper 37 is fully turned over, and the dust inside the grain is lifted up, providing a precondition for the dust collection of the subsequent dust removal system.

[0048] The implementation logic and coordination mechanism of the two operating modes.

[0049] This device precisely controls the working status of the magnetic suction components through a control module. Combined with the coordinated operation of the transmission and dust removal systems, it enables flexible switching between two modes: efficient conveying and impurity removal / drying. This adapts to different operational needs, balancing capacity and quality. Switching between the two modes requires no manual disassembly or adjustment of components; it can be completed simply by issuing commands through a remote control platform. The operation is convenient and the switching is rapid, enabling quick response to adjustments in capacity and quality during drying operations.

[0050] The high-efficiency conveying mode is primarily suitable for scenarios where the grain inventory in the drying tower is insufficient and rapid replenishment is required, or where the requirements for grain impurity removal are lower and production capacity is prioritized. When switching to this mode, the remote control platform sends a magnetic attraction command to the control microcontroller via the communication module. After receiving the command, the microcontroller controls the electromagnet to be energized, generating a magnetic field in the same direction as the magnetic plate, causing the two to attract each other. Under the action of the attraction force, the rubber sheet on the lower surface of the hopper undergoes elastic deformation, adhering towards the support plate, thereby expanding the effective volume of the hopper, increasing the single-load capacity, increasing the conveying capacity per unit time, and achieving high-efficiency conveying.

[0051] During the conveying process, the transmission system drives the hopper upwards along the conveying chamber. The guide rail constrains the hopper's posture, ensuring a smooth ascent without tilting or swaying. When the hopper reaches the turning area at the top of the frame, the control platform issues a repulsive force command. The microcontroller adjusts the electromagnet plate to switch the magnetic field direction, causing the electromagnet plate and the magnetic plate to repel each other. Under the action of the repulsive force, the hopper tilts rapidly around the shaft. The grain inside the hopper slides down quickly under the combined action of gravity and repulsion, while the repulsive force also pushes the grain. This results in fast unloading speed and minimal residue, effectively preventing material accumulation in the hopper and reducing material residue accumulation at the top of the conveying chamber, ensuring unobstructed conveying. After unloading, the electromagnet plate returns to its initial state, and the hopper resets under gravity and moves downwards with the chain, entering the next round of receiving and conveying cycle.

[0052] The impurity removal and drying mode is suitable for scenarios requiring high grain drying quality, effective removal of dust and impurities from the grains, and relatively low conveying speed requirements. When switching to this mode, the control platform issues periodic magnetic attraction / repulsion switching commands. The microcontroller controls the electromagnet and magnet plate to alternately switch between attraction and repulsion at a fixed frequency according to the commands. Under the alternating magnetic force, the hopper causes the grains inside to make small reciprocating tumbling movements. The grains collide and rub against each other, causing the dust and fine impurities trapped inside the grains to be lifted and dispersed into the air around the hopper, creating conditions for dust collection by the subsequent dust removal system.

[0053] While the grains are tumbling and removing impurities, the dust removal systems on both sides of the main frame are activated simultaneously, creating a directional airflow to quickly extract dust-laden air from the conveying chamber. This promptly removes the dust, preventing it from falling back into the grains and ensuring effective impurity removal. Simultaneously, the auxiliary impurity removal components of the feeding mechanism work concurrently to further reduce dust introduced during feeding, achieving end-to-end impurity removal protection. In this mode, the operating speed of the roller conveyor chain can be appropriately reduced, allowing sufficient tumbling time for the grains in the hopper, ensuring dust is fully dispersed, improving the thoroughness of impurity removal, and guaranteeing the quality of the dried grains.

[0054] During the switching between the two modes, components such as the transmission system, dust removal system, and feeding mechanism can work seamlessly together. In high-efficiency conveying mode, the dust removal system can be selectively activated as needed; if the grain impurity content is low, the dust removal system can be turned off to save energy. In impurity removal and drying mode, the transmission system automatically adjusts its operating speed, and the dust removal system and feeding mechanism start synchronously, forming a collaborative impurity removal system. The control module collects the working status data of each component in real time to ensure that the actions of each component are coordinated and consistent during mode switching, without conflict or jamming, thus ensuring stable equipment operation.

[0055] Example 2:

[0056] Based on Embodiment 1, this embodiment optimizes the dust removal structure of the frame body 1 as follows:

[0057] On both sides of the main body 1 of the frame, multiple sets of exhaust fans 12 are arranged alternately in the vertical direction. The exhaust fans 12 are fixed to the main body 1 of the frame by bolts through the mounting holes of the flange. The horizontal distance between adjacent exhaust fans 12 is 30cm and the vertical distance is 50cm. The exhaust fans 12 are axial flow fans with a rated air volume of 2-5m³ / min. The air inlet end is equipped with a stainless steel dustproof net with a hole diameter of 2mm to prevent grain particles from being sucked in.

[0058] The exhaust fan 12 has a detachable dust collection bag connected to its outlet end via a snap-fit ​​connection. The dust collection bag is made of non-woven fabric with a filtration accuracy of ≥5μm. It is used to collect the dust extracted during the impurity removal process, reducing dust on site. When the work site needs to centrally handle dust, the dust collection bag can be removed, and a dust collection pipe can be connected to the flange at the exhaust fan 12 outlet end to achieve centralized collection and discharge of dust, reducing the dust concentration in the air during construction.

[0059] Below the exhaust fan 12 on one side of the main frame 1, a rectangular processing chamber 11 is provided. An inspection door is connected to the chamber via a hinge. The edges of the inspection door are sealed with silicone rubber gaskets, achieving an IP54 protection level. The processing chamber 11 has two functions: first, it facilitates the cleaning of the dust filter of the exhaust fan 12 and the maintenance of the fan motor by the operator; second, when the lithium battery of the hopper 37 is low on power, the operator can quickly remove the lithium battery component of the hopper 37 through the chamber for replacement without disassembling the entire conveying device, thus improving maintenance efficiency by 30%.

[0060] Overall device architecture and transmission system.

[0061] The core supporting component of this device is the main frame 1, which adopts a vertical hollow steel structure frame design and uses high-strength steel plates as the base material to ensure that the structural strength is sufficient to support the weight of the hopper and grain. The main frame 1 employs a multi-process welding method, with the main welds and irregular corner structures welded separately to avoid welding defects and ensure overall stability. After welding, the surface oxide scale and welding slag of the main frame 1 are removed, followed by spraying two layers of high-temperature resistant and anti-corrosion coating, which can adapt to the high-temperature and high-humidity environment of the drying workshop for a long time, effectively extending the service life of the equipment. The bottom of the main frame 1 is also equipped with stable support feet, which are fixed to the ground with expansion bolts. This not only distributes the overall weight of the equipment to prevent settlement and displacement after long-term operation, but also reduces the transmission of vibration generated during equipment operation, minimizing the impact on the surrounding environment.

[0062] The main frame 1 has a rectangular conveying cavity vertically oriented inside. Bearing seats are symmetrically welded to the upper and lower ends of the cavity wall, housing high-quality deep groove ball bearings with excellent sealing performance. This effectively prevents moisture and dust generated during the drying process from entering, extending the bearing's service life. The drive shaft 13 is made of high-quality steel and heat-treated. It is tightly connected to the gear 14 via a flat key, ensuring a stable connection during transmission and preventing loosening or slippage. To further enhance connection reliability, the mating surfaces of the flat key and keyway are precision-machined for a tight, gapless fit. Wear-resistant grease is applied to the connection points, reducing frictional loss during transmission and providing rust and corrosion protection, ensuring stable transmission efficiency.

[0063] Gear 14 is made of high-strength steel. Four sets of parallel roller conveyor chains 3 mesh between the upper and lower gears 14. These chains are made of wear-resistant material and have undergone special treatment, exhibiting excellent fatigue resistance and the ability to stably bear the weight of the hopper and grain over a long period, ensuring continuous conveying operations. The four sets of conveyor chains are symmetrically distributed, corresponding to the installation positions on both sides of the hopper assembly. This ensures balanced force on the hopper during lifting and conveying, preventing problems such as hopper tilting and material spillage due to excessive force on one side, while also improving the overall operational stability of the transmission system.

[0064] To prevent issues such as tooth skipping and slack in the roller conveyor chain 3 during operation, two sets of tensioning rollers are installed at the bottom of the main frame 1. The position of these tensioning rollers is controlled by an adjustment mechanism to maintain appropriate chain tension. The surface of the tensioning rollers is made of wear-resistant material to reduce chain wear. The tensioning rollers are adjusted manually using a screw mechanism, making operation convenient. Operators can adjust the tension at any time according to the chain's running status without disassembling the equipment, significantly improving maintenance convenience. The drive shaft 13 is driven by a bottom-mounted drive motor via a worm gear reducer. The drive motor is a three-phase asynchronous motor suitable for industrial applications, providing stable power output and adjustable speed to meet different conveying efficiency requirements.

[0065] The inner wall of the conveying chamber of the main frame 1 is also equipped with a guide and protection structure. Guide rails are fixedly installed along the running trajectory of the roller conveyor chain 3. The guide rails are made of wear-resistant non-metallic material, which is hard and has a low coefficient of friction. This not only restrains the movement of the roller conveyor chain 3 and the hopper assembly, preventing deviation and shaking during operation, but also reduces frictional wear with the chain and shaft, thus lowering the operating noise of the equipment. The guide rails are detachably connected to the chamber wall by bolts. Elastic washers are added at the bolt connections to enhance the connection's firmness and buffer vibrations generated during operation, preventing the bolts from loosening. When the guide rails wear out, operators can directly remove the bolts to replace them with new ones without disassembling the entire conveying chamber, further improving the ease of operation and maintenance of the equipment.

[0066] In addition, the inner wall of the conveying chamber of the main frame 1 is smoothed to reduce friction between the grain and the chamber wall during conveying, thereby reducing material residue and accumulation. A limit block is set at the turning angle of the hopper 37, located at the second shaft 36, to prevent the hopper from going out of range and hitting the chamber wall when turning.

[0067] Both the motor and reducer of the transmission system are externally mounted, fixed to the outside of the main frame 1, and if necessary, installed on the upper and lower sides respectively, isolated from the conveying chamber. This not only prevents moisture and dust from the conveying chamber from entering the motor and reducer, affecting the normal operation of electrical components and mechanical parts, but also facilitates the inspection and maintenance of the motor and reducer. A flexible coupling is installed at the connection between the motor and reducer. The flexible coupling has a certain buffering and vibration damping capacity, absorbing the vibration generated during motor operation and reducing the impact of vibration on the transmission system. It also compensates for slight coaxiality deviations during installation, ensuring the stability of the transmission connection and preventing accelerated wear of components due to installation errors.

[0068] Example 3:

[0069] Based on Embodiment 1, this embodiment optimizes the bottom load-bearing structure of the frame body 1 as follows:

[0070] At the bottom of the conveying chamber of the main frame 1, four sets of evenly distributed elastic telescopic frames 16 are fixed with anchor bolts. Each elastic telescopic frame 16 consists of a high-strength cylindrical spring, a stainless steel guide rod, and a limiting block, with a rated load capacity of 1000 kg. When the weight of grain stored on the frame 17 at the top of the elastic telescopic frame 16 increases, the cylindrical spring is compressed and contracts, causing the frame 17 to move downward, increasing the storage space at the bottom of the conveying chamber. When the weight of grain decreases, the cylindrical spring elastically returns to its original position, causing the frame 17 to move upward, ensuring that the drop height of the hopper 37 is stable at 20 cm when unloading, so as to collect the grain that leaks down from the hopper 37.

[0071] Example 4:

[0072] This embodiment refines the structure of the feeding mechanism based on Embodiment 1, as follows:

[0073] The main body of the frame 1 corresponds to the lower material receiving position of the hopper 37, and a feeding mechanism is fixedly installed by bolts. The feeding mechanism includes a feeding mechanism 2 and a material conveying pipe 21. One end of the material conveying pipe 21 is connected to the outlet of the feeding mechanism 2 by a flange. The inside of the feeding mechanism 2 corresponds to the inlet end of the material conveying pipe 21, and a stainless steel mesh pipe 28 is fixedly installed by a bracket.

[0074] The top of the mesh tube 28 is fixedly installed with a vibration motor 27 by bolts. The vibration motor 27 is an eccentric wheel type micro vibration motor with a rated vibration frequency of 50Hz and an amplitude of 2mm. On the wall of the mesh tube 28 below the vibration motor 27, the material leakage ports 26 are evenly opened in the circumference. The diameter of the material leakage ports 26 is 8mm and the opening rate is ≥30%, which ensures that the grains fall evenly and avoids the mesh tube 28 from being blocked.

[0075] Near the top feeding position of the mesh tube 28, a feeding hood 24 is fitted and fixed. The feeding hood 24 has a funnel-shaped structure with a cone angle of 60° to facilitate rapid feeding of external grains. Near the bottom position of the feeding hood 24, an outer support frame 22 is fitted and installed. The outer support frame 22 is a ring-shaped bracket welded from aluminum alloy profiles. Four centrifugal fans 23 are evenly installed around its circumference. The rated air volume of the fans 23 is 0.5-1.2 m³ / min, which is used to blow away the floating dust raised during the feeding process.

[0076] A magnetic ring 25 is embedded at the contact surface between the outer support frame 22 and the feed hood 24. The magnetic ring 25 is a neodymium iron boron permanent magnet ring, and its adsorption force with the feed hood 24 is ≥50N, adsorbing metal impurities during feeding.

[0077] Working principle of this invention: This device is supported by a vertical frame and drives the hopper to circulate through a closed-loop roller conveyor chain. Combined with a magnetic adjustment structure and a dust removal system, it achieves coordinated operation of dual-mode conveying and online impurity removal. The specific principle is as follows:

[0078] 1. High-efficiency conveying mode;

[0079] When the grain storage in the drying tower is insufficient and it is necessary to improve conveying efficiency:

[0080] The remote control platform sends a magnetic attraction command through the 5G communication module. The electromagnet at the bottom of the hopper is energized to generate a magnetic field in the same direction as the magnet plate. The two attract each other, causing the rubber sheet to deform elastically, which increases the effective volume of the hopper by 30% and increases the single load capacity from 5L to 6.5L.

[0081] The roller conveyor chain drives the hopper upward under gear transmission. When it reaches the top turning section, the control platform issues a repulsive force command. The electromagnet plate switches the magnetic field direction and generates a repulsive force with the magnetic plate, pushing the hopper to tilt quickly to unload the material. At the same time, under the action of magnetic repulsion, the bottom of the rubber material is pushed out, achieving the effect of rapid material ejection. The unloading residue rate is reduced to less than 1%, avoiding material accumulation in the hopper 37.

[0082] 2. Impurity removal and drying mode;

[0083] When high grain quality is required, and it is necessary to reduce the conveying speed and remove impurities:

[0084] Grains enter the mesh tube through the feeding hood of the feeding mechanism. The vibrating motor drives the mesh tube to vibrate, causing the grains to fall evenly into the hopper through the discharge port. At the same time, the fan of the outer support frame blows away the floating dust raised during the feeding process.

[0085] The control platform issues periodic magnetic attraction / repulsion switching commands. The electromagnet and the magnetic plate alternately switch between attraction and repulsion at a frequency of 2Hz, causing the hopper to vibrate slightly back and forth, so that the grains are fully turned over and the dust trapped inside is lifted up.

[0086] The exhaust fans on both sides of the rack simultaneously draw out the internal air, and the dust raised is collected in a centralized manner through dust collection bags / dust collection pipes, realizing online impurity removal and reducing the impurity content of grains to below 0.5%.

[0087] 3. Auxiliary systems operate in coordination;

[0088] Transmission system: The drive shaft drives the gears to drive the chain in a cyclical motion, and the tension wheel maintains the chain tension to prevent tooth skipping; the top arc-shaped guide rail constrains the hopper's posture to ensure smooth steering.

[0089] Bottom support system: The elastic telescopic frame automatically rises and falls according to the weight of the grain, maintaining a stable dropping height and reducing grain breakage and dust.

[0090] Inspection and maintenance system: The rectangular processing chamber allows for quick replacement of hopper batteries and cleaning of fan filters without disassembling the device, improving operation and maintenance efficiency.

[0091] Those skilled in the art should understand that the discussion of any of the above embodiments is merely exemplary and is not intended to imply that the scope of the invention (including the claims) is limited to these examples; within the framework of the invention, the technical features of the above embodiments or different embodiments can also be combined, the steps can be implemented in any order, and there are many other variations of the different aspects of the invention as described above, which are not provided in the details for the sake of brevity.

[0092] This invention is intended to cover all such substitutions, modifications, and variations that fall within the broad scope of the appended claims. Therefore, any omissions, modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this invention should be included within the scope of protection of this invention.

Claims

1. A grain conveying device for a grain dryer, comprising a rack body (1), a feeding mechanism (2), a roller conveying chain (3), a magnetic assembly, a hopper (37) and a control module, characterized in that: the rack body (1) is internally provided with a vertical conveying cavity, the conveying cavity is rotatably installed with a driving shaft (13) at its upper and lower ends through a bearing seat, a gear (14) is fixed on the driving shaft (13), the upper and lower gears (14) are meshed and transmitted through the roller conveying chain (3), and in every four groups of parallel arranged roller conveying chains (3), a first shaft rod (32) and a second shaft rod (36) are coaxially fixedly arranged at the pin shaft positions of the second and fourth links, respectively; the outer wall of the first shaft rod (32) is provided with an interference fit sleeve ring, and the outer wall of the sleeve ring is fixedly connected with one end of a support plate (33) by full welding process; the upper surface of the support plate (33) is tightly installed with a metal base plate through bolts, and a magnet plate (34) is fixedly embedded in the middle of the base plate; the outer wall of the second shaft rod (36) is gap fit provided with an aluminum alloy sleeve pipe (35), and the outer wall of the sleeve pipe (35) is fixedly welded with the side wall of the hopper (37) by argon arc welding, the hopper (37) moves along the conveying cavity with the roller conveying chain (3), the lower surface of the hopper (37) is sealed by two rubber sheets (38), and an electromagnetic sheet (39) is fixedly pasted in the rectangular gap between the two rubber sheets (38); the magnetic assembly comprises the magnet plate (34) and the electromagnetic sheet (39) which cooperate with each other, the control module is electrically connected with the electromagnetic sheet (39), and can control the switching of magnetic attraction or repulsion between the electromagnetic sheet (39) and the magnet plate (34) to realize two working modes: in the fast conveying mode, the electromagnetic sheet (39) and the magnet plate (34) are switched to the magnetic attraction state to drive the hopper (37) to adjust the volume, and are switched to the repulsion state to push the hopper (37) to quickly unload when unloading; in the impurity removal mode, the electromagnetic sheet (39) and the magnet plate (34) periodically and alternately switch the magnetic attraction state and the repulsion state to drive the hopper (37) to vibrate and make the grains tumble to remove impurities, and cooperate with the dust removal structure to complete dust collection. the hopper (37) is an open structure formed by stamping 304 stainless steel, and the inner wall is polished; 2. The grain delivery device for a grain dryer as claimed in claim 1, wherein: the rubber sheet (38) is made of nitrile rubber; the magnet plate (34) is a neodymium iron boron permanent magnet, and the surface is plated with nickel for rust prevention; 3. The grain delivery device for a grain dryer as set forth in claim 1, wherein: the cooperation gap between the electromagnetic sheet (39) and the magnet plate (34) is 0.2mm. the side wall of the hopper (37) is embeddedly installed with a lithium battery assembly, an STM32 series control single-chip microcomputer and an industrial grade 5G communication module, and the lithium battery assembly is a ternary lithium battery pack; 4. The grain delivery device for a grain dryer of claim 1, wherein: the 5G communication module supports remote instruction issuing and state data uploading. the gear (14) is made of 45# steel with quenching and tempering treatment; a tensioning wheel is arranged at the bottom of the rack body to maintain tensioning force.

5. The grain delivery device for a grain dryer of claim 1, wherein: tandem arrangement of exhaust fans (12) is arranged on both sides of the rack body (1), the exhaust fan (12) is an axial flow fan, a detachable dust collection bag is arranged at the air outlet end, or a dust collection pipeline is connected to realize dust collection and discharge.

6. The grain delivery device for a grain dryer of claim 1, wherein: ​ 7. The grain delivery device for a grain dryer as set forth in claim 6, wherein: The rack body (1) one side of the exhaust fan (12) below the opening rectangular processing cavity (11), rectangular processing cavity is equipped with sealing access door, used for cleaning fan filter screen, replace the lithium battery assembly of hopper (37).

8. The grain delivery device for a grain dryer of claim 1, wherein: The bottom of the conveying cavity is provided with four groups of elastic telescopic supports (16), which are composed of high-strength cylindrical springs and guide rods, and the top of the elastic telescopic supports (16) is provided with a support body (17) for adjusting the height of the carried grains.

9. The grain delivery device for a grain dryer of claim 1, wherein: The feeding mechanism (2) is provided with a stainless steel mesh tube (28), and the top of the mesh tube (28) is provided with an eccentric wheel type vibration motor (27). The mesh tube (28) is uniformly provided with a leakage opening (26) on the wall, and the outer periphery of the mesh tube (28) is provided with a feeding cover (24) and an outer support frame (22), and the outer support frame (22) is uniformly provided with a centrifugal fan (23).

10. The grain delivery device for a grain dryer as set forth in claim 9, wherein: The contact surface of the outer support frame (22) and the feeding cover (24) is provided with a neodymium iron boron magnet ring (25), which realizes the quick disassembly, assembly and cleaning of the feeding cover (24).

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