Electromagnetic induction heating single-shaft rotary vane drying device and method

Abstract

This invention discloses an electromagnetic induction heating single-axis rotary blade drying device and method. The device's exhaust fan splits into two airflow paths: one draws out exhaust gas from the drying cylinder to maintain a slight negative pressure inside, and the other cools the induction cables of the electromagnetic induction heating component. The heating power supply preheats the drying cylinder in zones based on temperature measurement data. Then, the single-axis rotary blade stirring mechanism is activated, and wet powder is added. The blades tumble and push the powder, while the shaft-end baffle ring and reverse spiral structure prevent powder from entering the shaft-end packing sealing cavity. The electromagnetic induction eddy current effect causes the drying cylinder wall to self-heat, heating and drying the powder inside. The exhaust gas generated during drying is filtered to remove and recover fine powder before being discharged. Qualified dry powder is discharged from the bottom outlet at the end of the cylinder. This invention solves the problems of high heat loss, easy leakage of heat exchange medium contaminating materials, and high cost in existing indirect heat exchange drying equipment, and can meet the requirements for large-scale drying production of high-purity powders.

Description

Technical Field

[0001] This invention relates to the field of material drying technology, specifically to an electromagnetic induction heating single-axis rotary blade drying device and method. Background Technology

[0002] In fields such as polysilicon preparation and the industrial production of positive and negative electrode materials for new energy lithium batteries, wet powder drying is a crucial pre-process for ensuring product quality and maintaining the continuous and stable operation of production lines. Currently, the mainstream equipment in the industry for drying powders such as silicon powder and lithium battery positive and negative electrode materials is the heat-conducting oil / steam-heated hollow paddle dryer and disc dryer. This type of equipment employs an indirect heat exchange drying mechanism: high-temperature heat-conducting oil or saturated hot steam is introduced into the hollow main shaft, hollow paddles / discs, and the jacket of the cylinder. Heat is transferred to the wet powder inside the cylinder through the metal heat exchange walls, achieving drying. The equipment is equipped with a negative pressure extraction and nitrogen inert protection system, which can maintain a low-oxygen environment inside the cylinder, adapting to the production requirements of high-purity powders. It is now widely used in various industrial production lines for wet slurry concentration and powder drying. However, this type of equipment relies on the coordinated operation of a complete set of heat exchange auxiliary systems, including boilers, thermal oil heating units, conveying pipelines, and control valve groups, and relies on pressure chambers to achieve heat transfer. The system is complex and has high energy consumption, making it the mainstream and common solution in the current powder drying industry.

[0003] However, traditional heat transfer oil and steam heat exchange drying equipment has many inherent defects that are difficult to avoid, making it difficult to further meet the stringent requirements of low cost, high safety, and low energy consumption for large-scale production of high-purity powders. Firstly, the heat exchange chain has multiple layers, and heat must be conducted through multiple stages such as heat source, conveying pipeline, cylinder jacket, and hollow blades, resulting in significant heat loss from pipeline heat dissipation and temperature drop of the heat exchange medium, leading to low overall thermal efficiency and high energy consumption in powder drying production. Secondly, for drying powders with strong grinding properties, long-term operation will continuously erode and wear down the pressure-bearing heat exchange walls of the cylinder and blades. Once the walls are perforated and worn, the high-temperature heat transfer oil or steam medium will leak and contaminate the powder, causing the entire batch of material to be scrapped. At the same time, the leaked medium will also pollute the workshop environment and increase on-site pollution. The costs include cleaning and equipment operation and maintenance; thirdly, the cylinder, main shaft, hollow blades and heat exchange pipelines are all pressure-bearing components, and the whole machine is classified as a pressure vessel. Its design, processing and manufacturing, and factory testing must strictly comply with the relevant national standards for pressure vessels. After the equipment is put into use, it is also necessary to carry out pressure resistance testing, safety valve calibration, annual inspection of pressure pipelines, etc. on a regular basis. The cost of compliant operation and maintenance is high, and there are also safety hazards of pipe bursts and medium leakage under high temperature and high pressure operating conditions; fourthly, the equipment must be equipped with an independent boiler or thermal oil heating unit, supplemented by complex conveying pipelines, valve groups and other auxiliary accessories. The whole set of heat source auxiliary system occupies a large area, the initial equipment purchase and infrastructure investment costs are high, the daily inspection and maintenance workload of pipelines and auxiliary machines is large, and the overall production operation burden is heavy.

[0004] Therefore, the industry urgently needs an electromagnetic induction heating single-axis rotary blade drying equipment to solve many problems existing in the current technology, such as high heat loss, easy leakage of heat exchange medium contaminating powder, high management cost of the whole machine as a pressure vessel, and complicated auxiliary equipment and large footprint. Summary of the Invention

[0005] This invention provides an electromagnetic induction heating single-axis rotary blade drying device and method to solve the problems of high heat loss, easy leakage of heat exchange medium and contamination of materials in existing indirect heat exchange drying equipment, complicated peripheral supporting systems, and high overall cost due to the need to manage the jacketed pressure medium according to pressure vessel regulations.

[0006] To achieve the above objectives, the present invention provides the following technical solution: an electromagnetic induction heating single-axis rotary blade drying device, comprising a mounting base, a horizontal drying cylinder, a single-axis rotary blade stirring mechanism, a transmission system, electromagnetic induction heating components, a protective cover, a high-precision dust filter, an exhaust fan, an electromagnetic induction intelligent heating power supply unit, an insulating layer, a shaft end retaining ring, a lifting mechanism, and a temperature measuring element; the horizontal drying cylinder is a horizontal atmospheric pressure cylindrical structure, fixedly installed above the mounting base; the outer wall of the horizontal drying cylinder is covered with the insulating layer; the lower half of the arc-shaped wall of the horizontal drying cylinder is the main heating area, and several sets of electromagnetic induction heating components are arranged on the outer side of the insulating layer corresponding to the main heating area, and the electromagnetic induction heating components are covered with the protective cover; the single-axis rotary blade stirring mechanism is arranged through the interior of the horizontal drying cylinder, and the drive end of the single-axis rotary blade stirring mechanism is connected to the transmission system, which is fixedly installed on the mounting base; The high-precision dust filter is mounted on the top of the horizontal drying cylinder near the feed inlet. The outlet pipe of the high-precision dust filter is connected to the exhaust fan. The inlet of the exhaust fan is provided with a diversion and reuse pipeline. The first branch of the diversion and reuse pipeline is connected to the high-precision dust filter, and the second branch of the diversion and reuse pipeline is connected to the inside of the protective cover. Each group of electromagnetic induction heating components is independently electrically connected to a set of electromagnetic induction intelligent heating power supply units. Each group of electromagnetic induction heating components has four sets of lifting mechanisms at its bottom. The bottom end of the lifting mechanism is fixed to the mounting base, and the top end is fixedly connected to the support frame of the electromagnetic induction heating component. The lifting mechanism is used to drive the electromagnetic induction heating component to fit against or detach from the outer wall of the horizontal drying cylinder. Each of the electromagnetic induction heating components is equipped with a temperature measuring element. The probe end of the temperature measuring element is in close contact with the outer wall of the horizontal drying cylinder, and the signal output end of the temperature measuring element is electrically connected to the temperature control end of the corresponding electromagnetic induction intelligent heating power supply host.

[0007] As a preferred embodiment of the electromagnetic induction heating single-axis rotary blade drying equipment, the single-axis rotary blade stirring mechanism includes a central shaft, fan-shaped rotary blades, radial triangular reinforcing ribs, nodal triangular support flat steel, and reverse spiral blades. Several sets of the aforementioned fan-shaped blades are spirally arranged on the central axis, and several fan-shaped blades are evenly arranged within the same spiral lead; three radial triangular reinforcing ribs are provided on the side of the fan-shaped blade facing away from the material and subjected to force; the root of the fan-shaped blade facing the material and subjected to force is provided with the node triangular support flat steel. The horizontal drying cylinder has a shaft end retaining ring coaxially arranged at the center of the end caps at both ends; the reverse spiral blade is arranged on the central shaft section corresponding to the inner side of the shaft end retaining ring; there is a set gap between the outer edge of the reverse spiral blade and the inner wall of the shaft end retaining ring.

[0008] As a preferred embodiment of the electromagnetic induction heating single-axis rotary blade drying equipment, the electromagnetic induction heating assembly includes a support frame and an induction cable; the support frame is made of antistatic phenolic paperboard or a material with equivalent performance, and the curvature of the top arc surface of the support frame is adapted to the outer wall of the horizontal drying cylinder; the arc-shaped frame beam of the support frame has uniformly distributed slots along its upper edge, and the induction cable is spirally wound uniformly along the slots; the two ends of the induction cable are connected to the output terminals of the corresponding electromagnetic induction intelligent heating power supply unit.

[0009] As a preferred embodiment of the electromagnetic induction heating single-axis rotary blade drying equipment, the temperature sensing element includes a metal sleeve, a sleeve spring lug, a locking nut, a nut spring lug, and a tension spring; the metal sleeve is fixedly installed on the support frame of the electromagnetic induction heating assembly, and the threaded section of the temperature sensing element is fitted with the locking nut; the tension spring is connected between the sleeve spring lug and the nut spring lug, and the tension spring provides preload to the temperature sensing element so that the probe end of the temperature sensing element is in close contact with the outer wall of the horizontal drying cylinder.

[0010] As a preferred embodiment of the electromagnetic induction heating single-axis rotary blade drying equipment, the high-precision dust removal filter is internally equipped with a high-temperature metal filter bag; the high-temperature metal filter bag is made of high-temperature alloy metal fiber sintered material.

[0011] As a preferred embodiment of the electromagnetic induction heating single-axis rotary blade drying equipment, the horizontal drying cylinder, the central shaft, and the fan-shaped rotary blades are configured with any of the following material and structural schemes: Scheme 1: The horizontal drying cylinder is made of magnetically conductive carbon steel plate, and the inner wall of the horizontal drying cylinder, the central shaft, and the material contact working surface of the fan-shaped rotary blades are all covered with a tungsten carbide coating; Scheme 2: The horizontal drying cylinder is made of magnetically conductive carbon steel lined with stainless steel plate, and the central shaft and the fan-shaped rotary blades are both made of stainless steel; the inner wall of the horizontal drying cylinder, the central shaft, and the surface of the fan-shaped rotary blades are all polished.

[0012] As a preferred embodiment of the electromagnetic induction heating single-axis rotary blade drying equipment, the lifting mechanism is a hand-cranked worm gear screw structure; the lifting mechanism is used to drive the electromagnetic induction heating component to rise and fall, so that the electromagnetic induction heating component is in contact with or detached from the outer wall of the horizontal drying cylinder.

[0013] As a preferred embodiment of the electromagnetic induction heating single-axis rotary blade drying equipment, each group of electromagnetic induction heating components is independently powered and independently temperature controlled; the electromagnetic induction intelligent heating power supply host of each group can individually adjust the output power and set temperature of the corresponding electromagnetic induction heating component.

[0014] This invention also provides a method for drying a single-axis rotary blade using electromagnetic induction heating, comprising the following steps: lifting all electromagnetic induction heating components using a lifting mechanism, so that the electromagnetic induction heating components are in contact with the outer wall of the insulation layer on the outside of the horizontal drying cylinder; starting the exhaust fan and distributing two airflows by adjusting the butterfly valve, one of which draws out the exhaust gas inside the horizontal drying cylinder to maintain a slightly negative pressure drying environment inside the horizontal drying cylinder; the other airflow enters the protective cover to cool the induction cable. Turn on the main electromagnetic induction heating power supply of each group, and adjust the heating power of the corresponding electromagnetic induction heating components according to the real-time temperature of the cylinder wall collected by each group of temperature measuring elements. Set gradient preheating temperature along the material conveying direction to perform differentiated preheating of the horizontal drying cylinder in different zones; start the transmission system to drive the single-shaft rotary blade stirring mechanism to rotate at a constant speed; the wet powder is fed into the inner cavity of the cylinder from the feed port at the top front end of the horizontal drying cylinder; the fan-shaped rotary blades continuously tumble, loosen and axially push the wet powder; the reverse spiral blades push the powder into the baffle ring at the shaft end. The powder is pushed back into the drying chamber of the cylinder; the electromagnetic induction heating component uses the electromagnetic induction eddy current effect to heat the metal wall of the horizontal drying cylinder itself, and relies on the heat generated by the cylinder wall to heat and dry the wet powder inside the cylinder; the dust-laden exhaust gas generated during the drying process rises into the high-precision dust filter, and the fine powder in the exhaust gas is intercepted by the high-temperature metal filter bag; the intercepted fine powder falls back into the horizontal drying cylinder through pulse backflushing to achieve powder recovery; the exhaust gas purified by the high-precision dust filter is extracted by the exhaust fan and discharged to the outside; The dried powder is discharged from the outlet at the bottom end of the horizontal drying cylinder.

[0015] As a preferred solution for the electromagnetic induction heating single-axis rotary blade drying method, when a single electromagnetic induction heating component malfunctions, the corresponding electromagnetic induction intelligent heating power supply host is shut down; the malfunctioning electromagnetic induction heating component is lifted out of the horizontal drying cylinder by a lifting mechanism for maintenance or replacement; the remaining electromagnetic induction heating components maintain normal operation and run continuously.

[0016] This invention has the following advantages: First, it adopts a structure in which an electromagnetic induction heating component is arranged on the outside of the drying cylinder. It utilizes the electromagnetic induction eddy current effect generated by an alternating magnetic field to rapidly heat the metal wall of the drying cylinder, replacing the traditional indirect heating method using heat transfer oil and saturated steam as the heat exchange medium. The powder inside the cylinder is dried directly by the heating of the cylinder wall itself. This heating method eliminates the need for multi-stage medium heat exchange, avoids energy losses caused by heat dissipation in the heat exchange medium transport pipeline and temperature drops in the heat exchange medium, significantly improves the overall thermal efficiency of the equipment, reduces energy consumption in powder drying operations, and offers superior long-term economic efficiency.

[0017] Secondly, this invention does not require heat transfer oil, saturated steam or other high-temperature heat exchange media to transfer heat, and there is no working condition of heat exchange media leakage. It can avoid the production risk of heat exchange media seeping into the drying chamber and contaminating the material after the heat exchange wall of the drying equipment is perforated due to long-term scouring and wear of the material, which would cause the entire batch of material to be scrapped. This invention eliminates the potential pollution hazard of such materials from the source.

[0018] Third, this invention significantly simplifies the overall structure of the drying unit. The drying cylinder adopts a horizontal atmospheric pressure cylindrical structure. The equipment operates under atmospheric pressure or slightly negative pressure. The whole machine does not need to be included in the scope of pressure vessel supervision. It does not need to carry out design, processing and manufacturing, factory inspection and periodic verification work in accordance with the relevant national standards for pressure vessels. This can reduce the equipment manufacturing cost and the subsequent compliance operation and maintenance cost, while reducing the operational safety risks brought by traditional high temperature and high pressure medium heat exchange equipment.

[0019] Fourth, this invention is equipped with multiple independently operating electromagnetic induction heating components. Each heating component has independent power distribution and temperature control, and their operation does not interfere with each other. The heating power and temperature of any one heating component can be adjusted individually according to the actual powder drying conditions, achieving precise heating of the entire drying cylinder in designated zones. This adapts to the differentiated process requirements of the entire powder drying process, improving the technical problems of large overall heating temperature differences, insufficient local powder drying, and high ineffective energy consumption in traditional drying equipment.

[0020] Fifth, this invention eliminates the need for thermal oil heating units, boiler systems, and complex heat exchange medium pipelines, significantly simplifying the auxiliary structures and reducing the overall footprint. This reduces initial equipment and infrastructure investment and also decreases subsequent maintenance and repair workload, making it suitable for large-scale industrial production scenarios. Attached Figure Description

[0021] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the accompanying drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the accompanying drawings described below are merely exemplary embodiments of the present invention. For those skilled in the art, other embodiments can be derived from the accompanying drawings based on the present invention without any creative effort.

[0022] The structures, proportions, and dimensions illustrated in this specification are solely for illustrative purposes and to aid those skilled in the art in understanding the technical content disclosed herein. They are not intended to limit the implementation conditions of the invention and therefore do not constitute a substantial limitation on the scope of protection of this invention. Modifications to the structure, adjustments to the proportional relationships, or alterations to the dimensions, provided they do not affect the technical effects and objectives to be achieved by this invention, should still fall within the scope of protection of the technical content disclosed in this invention.

[0023] Figure 1 is a front view of an electromagnetic induction heating single-axis rotary blade drying device provided in Embodiment 1 of the present invention.

[0024] Figure 2 is a left view of an electromagnetic induction heating single-axis rotary blade drying device provided in Embodiment 1 of the present invention.

[0025] Figure 3 is a schematic diagram of the single-shaft rotary blade stirring mechanism provided in Embodiment 1 of the present invention.

[0026] Figure 4 is a schematic diagram of the single-shaft rotary blade stirring mechanism structure provided in Embodiment 1 of the present invention.

[0027] Figure 5 is a schematic diagram of the shaft end retaining ring structure provided in Embodiment 1 of the present invention.

[0028] Figure 6 is a schematic diagram of the electromagnetic induction heating component provided in Embodiment 1 of the present invention.

[0029] Figure 7 is a schematic diagram of the installation structure of the spring preloaded temperature measuring element provided in Embodiment 1 of the present invention.

[0030] Figure 8 is a schematic diagram of the high-temperature metal filter bag provided in Embodiment 1 of the present invention.

[0031] Figure 9 is a schematic diagram of the process flow of an electromagnetic induction heating single-axis rotary blade drying device provided in Embodiment 1 of the present invention.

[0032] Figure 10 is a schematic flowchart of an electromagnetic induction heating uniaxial rotary blade drying method provided in Embodiment 2 of the present invention.

[0033] In the diagram: 1. Mounting base; 2. Horizontal drying cylinder; 3. Single-shaft rotary blade stirring mechanism; 3-1. Central shaft; 3-2. Fan-shaped rotary blade; 3-3. Radial triangular reinforcing rib; 3-4. Node triangular support flat steel; 3-5. Reverse spiral blade; 4. Transmission system; 5. Electromagnetic induction heating assembly; 5-1. Support frame; 5-2. Induction cable; 6. Protective cover; 7. High-precision dust filter; 7-1. High-temperature metal filter bag; 8. Exhaust fan; 9. Electromagnetic induction intelligent heating power supply unit; 10. Insulation layer; 11. Shaft end retaining ring; 12. Lifting mechanism; 13. Temperature measuring element; 13-1. Metal sleeve; 13-2. Sleeve spring lug; 13-3. Locking nut; 13-4. Nut spring lug; 13-5. Tension spring. Detailed Implementation

[0034] The following specific embodiments illustrate the implementation of the present invention. Those skilled in the art can easily understand other advantages and effects of the present invention from the content disclosed in this specification. Obviously, the described embodiments are only some, not all, of the embodiments of the present invention. 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. Example 1

[0035] Referring to Figures 1 and 2, Embodiment 1 of the present invention provides an electromagnetic induction heating single-axis rotary blade drying device, including a mounting base 1, a horizontal drying cylinder 2, a single-axis rotary blade stirring mechanism 3, a transmission system 4, an electromagnetic induction heating component 5, a protective cover 6, a high-precision dust removal filter 7, an exhaust fan 8, an electromagnetic induction intelligent heating power supply host 9, an insulating layer 10, a shaft end retaining ring 11, a lifting mechanism 12, and a temperature measuring element 13.

[0036] Specifically, this equipment is suitable for continuous drying production of various high-purity powders, such as polycrystalline silicon raw material silicon powder and positive and negative electrode materials for new energy lithium batteries. The mounting base 1 bears the entire load of the equipment; the horizontal drying cylinder 2 is the powder drying chamber; the single-shaft rotary agitator 3 completes the tumbling, dispersing, and axial conveying of the powder; the transmission system 4 provides rotational power to the single-shaft rotary agitator 3; the electromagnetic induction heating component 5 generates a high-frequency alternating magnetic field, inducing electromagnetic eddy currents on the metal wall of the drying cylinder, causing the cylinder wall to heat up; the protective cover 6 provides electromagnetic shielding and forms a cooling and ventilation channel; the high-precision dust filter 7 captures and recovers fine powders from the exhaust gas; the exhaust fan 8 achieves negative pressure extraction inside the drying cylinder, while simultaneously providing airflow to the induction cable. The system provides heat dissipation and air cooling; the electromagnetic induction intelligent heating power supply host 9 outputs high-frequency electrical energy with adjustable power to the electromagnetic induction heating component; the insulation layer 10 serves to provide heat insulation, insulation, and prevent leakage; the shaft end baffle ring 11 prevents powder from entering the shaft end filler sealing cavity; the lifting mechanism 12 supports the electromagnetic induction heating component 5, raising it to fit against or lowering it away from the outer wall of the horizontal drying cylinder 2; the temperature measuring element 13 is used to collect the temperature of the outer wall of the cylinder in real time; the above components work together to complete the powder drying operation under normal pressure, abandoning the traditional drying mode of indirect heat exchange with heat transfer oil and saturated steam.

[0037] The horizontal drying cylinder 2 is a horizontal atmospheric pressure cylindrical structure, which is fixedly installed above the mounting base 1; the outer wall of the horizontal drying cylinder 2 is covered with the insulating layer 10; the lower half of the arc-shaped wall of the horizontal drying cylinder 2 is the main heating area, and several sets of electromagnetic induction heating components 5 are attached to the outside of the insulating layer 10 of the main heating area; the electromagnetic induction heating components 5 are covered with the protective cover 6.

[0038] Specifically, the horizontal drying cylinder 2 does not have a hollow pressure-bearing jacket or media flow channel for heat transfer oil and steam. Therefore, the entire unit does not require design, manufacturing, factory inspection, or periodic calibration according to relevant national standards for pressure vessels, thus avoiding the pressure control requirements of traditional heat exchanger cylinders. The cylinder is made of magnetically conductive carbon steel or carbon steel lined with stainless steel, rolled and welded, and is horizontally mounted. The bottom of the cylinder is fixed to the load-bearing support beam of the mounting base 1 by multiple sets of support legs, with each support leg evenly distributed along the length of the cylinder to ensure its stability. A powder inlet and filter installation interface are provided at the top of the cylinder, and a finished powder outlet is provided at the bottom end of the cylinder to meet the needs of continuous feeding and discharging operations. The entire outer wall of the horizontal drying cylinder 2 is covered with an insulating layer 10, which adopts a double-layer composite structure: the inner layer is made of high-temperature resistant aluminum silicate material, and the outer layer is made of silica nano-aerogel material, with a total thickness of not less than 40mm, effectively reducing heat loss from the cylinder surface. The electromagnetic induction heating component 5 has an arc-shaped tile-like frame structure, and its arc curvature matches the arc surface of the outer wall of the horizontal drying cylinder 2.

[0039] Based on the actual heat exchange requirements of powder drying, heating components are only installed on the arc-shaped wall surface of the lower half of the cylinder where material accumulates and heat exchange occurs. No heating components are installed in the upper half of the cylinder where there is no material, achieving precise heat source matching and reducing ineffective heating losses. Multiple sets of electromagnetic induction heating components 5 are arranged in sections along the axial direction of the cylinder, with maintenance gaps reserved between each set for easy independent maintenance later. The distance between the arc-shaped surface of the electromagnetic induction heating component 5 and the outer wall of the insulation layer 10 is controlled within 200mm to ensure high-frequency magnetic field coupling effect and reduce magnetic energy loss. The protective cover 6 is a sealed enclosure formed by bending and assembling non-magnetic aluminum alloy plates, completely enclosing all electromagnetic induction heating components 5. A safety distance of no less than 300mm is reserved between the protective cover 6 and the internal induction cables of the electromagnetic induction heating components 5. The aluminum alloy plates attenuate high-frequency electromagnetic radiation through the conductor eddy current effect, avoiding interference from high-frequency electromagnetic fields with surrounding instruments and electrical control systems, while also reducing external electromagnetic radiation and improving the safety performance of equipment operation. Ventilation openings are provided at the bottom of the protective outer casing 6. The ventilation openings are connected to the cooling air duct of the exhaust fan 8 to form an air-cooled cavity, which can provide air cooling for the induction cable 5-2 on the electromagnetic induction heating component 5, ensuring the long-term stable operation of the heating component.

[0040] The single-shaft rotary agitator 3 is arranged through the interior of the horizontal drying cylinder 2; the drive end of the single-shaft rotary agitator 3 is connected to the transmission system 4; the transmission system 4 is fixedly installed on the mounting base 1.

[0041] Specifically, the single-shaft rotary blade stirring mechanism 3 is an integrated heavy-duty welded shaft assembly structure, running through both ends of the horizontal drying cylinder 2 along its horizontal centerline. Multiple sets of fan-shaped blades are spirally welded to the outer wall of the shaft, with four fan-shaped blades evenly spirally arranged in each circumferential direction. The included angle of the center of each fan-shaped blade is 60°, and the spiral helix angle of the blades ranges from 15° to 30°. The driving end of the stirring shaft extends out of the cylinder end cover and is connected to the outer transmission system 4. The inner sides of the end covers at both ends of the cylinder are fitted with shaft end baffle structures to prevent powder from entering the shaft end sealing cavity. The transmission system 4 consists of a drive motor, a reduction gearbox, a coupling, and a sprocket and chain assembly. The driving sprocket is fixed at the output end of the reduction gearbox, and the driven sprocket is assembled at the central shaft drive end of the single-shaft rotary blade stirring mechanism 3. The torque output by the drive motor is reduced and increased by the reduction gearbox, and then drives the entire stirring shaft to rotate at a uniform speed through the sprocket and chain pair, smoothly completing the powder tumbling and axial pushing operations inside the cylinder.

[0042] The drive motor and reduction gearbox are fastened to the extension frame of the mounting base 1 by high-strength bolts. The transmission system 4 and the horizontal drying cylinder 2 share the same bearing reference mounting base 1. The main beam of the base adopts a thickened and reinforced structural design, which can effectively attenuate the periodic vibration generated by the stirring operation.

[0043] The high-precision dust filter 7 is mounted on the top of the horizontal drying cylinder 2 near the feed inlet; the exhaust pipe of the high-precision dust filter 7 is connected to the exhaust fan 8; the intake end of the exhaust fan 8 is provided with a diversion and reuse pipeline, one of which is connected to the high-precision dust filter 7 to extract the exhaust gas inside the horizontal drying cylinder 2, and the other is connected to the inside of the protective cover 6 to provide air cooling for the induction cable 5-2 of the electromagnetic induction heating component 5.

[0044] Specifically, the high-precision dust filter 7 is vertically installed at the top of the horizontal drying cylinder 2, axially offset from the feed inlet, located in the area where the humid exhaust gas rises and collects inside the cylinder. The filter contains cylindrical high-temperature resistant alloy metal filter bags with a filtration accuracy of less than 1μm and a long-term operating temperature tolerance of over 200℃. The filter is equipped with an electromagnetic pulse valve and pulse controller, which uses pulse jets to compress inert gas, removing fine powder trapped on the filter bag surface. The detached powder falls back into the cylinder for further drying. The air outlet at the top of the filter is connected to the air inlet of the exhaust fan 8 via a high-temperature resistant metal duct. The duct is completely sealed to prevent gas leakage. The exhaust fan 8 continuously draws air outwards, maintaining a stable slightly negative pressure inside the horizontal drying cylinder 2. This slightly negative pressure condition prevents dust from overflowing from the feed inlet and shaft end gaps, and also allows for the timely removal of moisture released during the powder drying process, improving material dehydration efficiency. The exhaust fan 8 outlet main pipe is equipped with a diversion tee and an airflow regulating butterfly valve. By adjusting the opening of the butterfly valve, the airflow ratio of the two airflow paths can be controlled: one airflow draws out the exhaust gas after it has been filtered and purified by the high-precision dust filter 7, achieving compliant exhaust emissions; the other airflow is guided to the ventilation interface at the bottom of the protective cover 6. The airflow circulates inside the cover, passing through each set of electromagnetic induction heating components 5, relying on convection heat exchange to carry the heat generated by the induction cable. This structure eliminates the need for an additional independent cooling fan, effectively simplifying the entire equipment system.

[0045] Each set of electromagnetic induction heating components 5 is independently electrically connected to a set of electromagnetic induction intelligent heating power supply host 9; each set of electromagnetic induction heating components 5 is equipped with four sets of lifting mechanisms 12 at the bottom; the bottom end of the lifting mechanism 12 is fixed on the mounting base 1, and the top end is fixedly connected to the support frame 5-1 of the electromagnetic induction heating component 5, which is used to drive the electromagnetic induction heating component 5 to fit or detach from the horizontal drying cylinder 2.

[0046] Specifically, each group of arc-shaped electromagnetic induction heating components 5 is equipped with its own electromagnetic induction intelligent heating power supply unit 9, and the power supply circuits of each group are independent and do not interfere with each other. Operators can adjust the output power and temperature parameters of the corresponding heating components through a single power supply unit; when any heating component malfunctions, only its power supply unit needs to be shut down, and the remaining heating units can still operate normally without shutting down the entire equipment. The lifting mechanism 12 adopts a hand-cranked worm gear screw structure, and turning the hand-cranked worm gear handwheel drives the screw to achieve lifting and reciprocating motion. A lifting mechanism 12 is set at each of the four corners of the bottom of a single electromagnetic induction heating component 5; the base of the lifting mechanism is fastened to the frame beam of the mounting base 1 by bolts, and the top of the screw is fixed to the bottom beam of the arc-shaped frame of the electromagnetic induction heating component 5 by flange bolts. During normal drying operation, the lifting mechanism 12 raises the electromagnetic induction heating component 5, ensuring that its arc-shaped tile surface fits tightly against the outer wall of the heating section of the horizontal drying cylinder, thereby guaranteeing high-frequency magnetic coupling efficiency. When carrying out equipment maintenance, repair, or parts replacement, the lifting mechanism 12 lowers the lead screw, causing the electromagnetic induction heating component 5 to move down as a whole and separate from the drying cylinder. The electromagnetic induction heating component 5 can be moved out laterally without disassembling the entire machine, significantly reducing equipment downtime for maintenance.

[0047] Each electromagnetic induction heating assembly 5 is equipped with a temperature measuring element 13; the probe end of the temperature measuring element 13 is arranged close to the outer wall of the horizontal drying cylinder 2 to collect the temperature parameters of the outer wall of the horizontal drying cylinder 2 in real time; the signal output end of the temperature measuring element 13 is electrically connected to the temperature control end of the corresponding electromagnetic induction intelligent heating power supply host 9 to realize temperature data transmission and closed-loop temperature control.

[0048] Specifically, each independently partitioned electromagnetic induction heating assembly 5 is equipped with a set of temperature sensing elements 13. The temperature sensing elements 13 adopt a spring-preloaded floating installation structure and are fixed to the side of the heating assembly support frame facing the drying cylinder. Multiple sets of temperature sensing elements are arranged in sections along the axial direction of the horizontal drying cylinder, corresponding to different drying sections of the cylinder, realizing real-time temperature monitoring of the entire cylinder in sections. The probe end of the temperature sensing element 13 is continuously pressed against the outer wall of the horizontal drying cylinder 2 by the preload force of the tension spring, which can directly pick up the true temperature of the metal wall of the cylinder, avoiding the problem of temperature value distortion caused by probe loosening, suspension, or detachment from the wall. Compared with the use of temperature sensing end welded fixed thermocouples, the spring-preloaded floating installation structure is convenient to disassemble and replace and has lower maintenance costs. The real-time temperature signal collected by the temperature sensing element 13 is transmitted to the built-in temperature control module of the electromagnetic induction intelligent heating power supply host 9 in the same group through the shielded signal line. The power supply host compares and calculates the measured temperature with the preset process temperature, and automatically increases or decreases the electromagnetic heating output power to form a closed-loop temperature control logic of "temperature acquisition-signal transmission-power adaptive adjustment".

[0049] This allows for independent temperature control of each drying section of the cylinder, adapting to the differentiated heating conditions of wet powder with high moisture content in the pre-feeding stage and low moisture content in the post-discharge stage.

[0050] In this embodiment, the single-axis rotary blade stirring mechanism 3 includes a central shaft 3-1, fan-shaped rotary blades 3-2, radial triangular reinforcing ribs 3-3, node triangular support flat steel 3-4, and reverse spiral blades 3-5. Several sets of fan-shaped rotary blades 3-2 are spirally welded on the central shaft 3-1, and several fan-shaped rotary blades 3-2 are evenly distributed within the same spiral lead. Three radial triangular reinforcing ribs 3-3 are welded to the side of the fan-shaped rotary blades 3-2 facing away from the material. The node triangular support flat steel 3-4 is welded to the root of the fan-shaped rotary blades 3-2 facing the material. The shaft end retaining rings 11 are coaxially arranged at the center of the end caps at both ends of the horizontal drying cylinder 2. The reverse spiral blades 3-5 are welded to the shaft section of the central shaft 3-1 corresponding to the inner side of the shaft end retaining rings 11. A set distance is reserved between the outer edge of the reverse spiral blades 3-5 and the inner wall of the shaft end retaining rings 11.

[0051] Specifically, as shown in Figures 3, 4, and 5, the single-shaft rotary blade stirring mechanism 3 is the core moving component for powder agitation, conveying, and preventing sticking to the wall inside the cylinder. The entire assembly is an integrated welded structure. The central shaft 3-1 is the main load-bearing shaft, the fan-shaped rotary blades 3-2 are responsible for material agitation and axial pushing, and the radial triangular reinforcing ribs 3-3 and the nodal triangular support flat steel 3-4 constitute the rotary blade reinforcement structure. The shaft end retaining ring 11 and the reverse spiral blades 3-5 cooperate to form the shaft end anti-material leakage sealing and protection structure. After all components are welded, all welds of the stirring shaft assembly are subjected to magnetic particle non-destructive testing to eliminate welding cracks and defects, ensuring that the equipment can operate stably under heavy loads for a long time. The central shaft 3-1 is made of thickened solid alloy steel forgings and runs through the entire length of the drying cylinder. The shaft body is segmented and welded with fan-shaped blades 3-2 along the axial direction at a fixed helical angle. Four fan-shaped blades 3-2 are evenly arranged in a single spiral position, with the included angle of the center of each blade set at 60°. The overall helical angle of the blades is controlled between 15° and 30°. During the stirring and rotation process, a continuous spiral pushing working surface is formed, which can smoothly transport the wet powder from the feed end to the discharge end, while continuously breaking up agglomerated powder and constantly renewing the powder's heat-contact surface to ensure uniform drying. During the drying process, the powder material will continuously exert axial and radial erosion impact loads on the fan-shaped blades 3-2. To address this, three radially distributed triangular reinforcing ribs 3-3 are distributed on the back of the blades, forming a stable triangular support structure. The two ends of the ribs are fully welded to the back of the blades and the outer wall of the central shaft 3-1, respectively. This effectively disperses the powder impact load borne by the blades, significantly improves the blades' resistance to bending and erosion wear, and avoids blade deformation, weld cracking, and other failures during long-term operation. This design is suitable for drying high-hardness, highly abrasive, and high-purity powders such as silicon powder. The connection root between the fan-shaped rotary blade 3-2 and the central shaft 3-1 is a critical area of ​​stress concentration, easily subject to shear stress caused by the frontal compression of powder, leading to fatigue cracking. A triangular support flat steel 3-4 is welded to the root of the rotary blade, forming a local triangular reinforcement structure together with the rotary blade surface and the outer wall of the main shaft. This further strengthens the structural strength of the welded joint at the root of the rotary blade, offsets the shear stress caused by the frontal compression of powder, prevents fatigue cracking of the weld at the root of the rotary blade, and effectively extends the overall service life of the single-shaft rotary blade mixing mechanism. The shaft end retaining ring 11 is a cylindrical annular component concentric with the central shaft 3-1, assembled on the inner side of the end caps of the cylinder at both ends of the mixing shaft and the packing seal. The inner diameter of the retaining ring 11 is larger than the outer diameter of the central shaft 3-1, forming an annular buffer cavity, effectively preventing powder inside the cylinder from directly impacting the shaft end packing seal structure. Simultaneously, at least two complete reverse spiral blades 3-5 are welded to the central shaft 3-1 within the area covered by the retaining ring 11, with their spiral direction opposite to that of the fan-shaped rotary blade 3-2 used for material conveying inside the cylinder.When a small amount of powder enters the internal cavity of the baffle ring, the reverse spiral blades 3-5, which rotate synchronously with the main shaft, generate a reverse pushing force, actively pushing the accumulated powder back into the main drying chamber of the cylinder, reducing powder accumulation at the shaft end seal from the source. The distance between the outer edge of the reverse spiral blades 3-5 and the inner wall of the shaft end baffle ring 11 is controlled at 1~2mm. This gap design prevents powder from entering the sealing cavity due to excessive gap, and also prevents friction and scratching between the blades and the inner wall of the baffle ring due to insufficient gap, resulting in metallic impurities contaminating the high-purity powder. Through the narrow gap combined with the reverse spiral pushing structure, fine powder can be blocked from entering the shaft end sealing area to the maximum extent, extending the service life of the packing seal and reducing the frequency and cost of equipment maintenance.

[0052] In this embodiment, the electromagnetic induction heating assembly 5 includes a support frame 5-1 and an induction cable 5-2; the support frame 5-1 is made of antistatic phenolic paperboard, and the curvature of its arc-shaped surface is adapted to the outer wall of the horizontal drying cylinder 2; the arc-shaped frame beam of the support frame 5-1 has uniformly distributed slots along its upper edge, and the induction cable 5-2 is spirally wound uniformly along the slots; the two ends of the induction cable 5-2 are respectively connected to the output ends of the corresponding electromagnetic induction intelligent heating power supply host 9.

[0053] Specifically, as shown in Figure 6, the electromagnetic induction heating component 5 is a split, arc-shaped, detachable structure, mainly composed of two basic components: a support frame 5-1 and an induction cable 5-2. This component can be attached to and detached from the horizontal drying cylinder via a lifting mechanism 12 at the bottom. Each heating component has independent power supply and temperature control; if a single component malfunctions, it can be repaired individually without shutting down the entire line, thus meeting the requirements of continuous powder drying production lines. The support frame 5-1 uses 3021 type antistatic phenolic paperboard as its base material, which combines high temperature resistance, high insulation, antistatic properties, and non-magnetic properties. The top surface of the frame is formed into an arc-shaped tile structure, with its inner arc curvature matching the outer wall curvature of the horizontal drying cylinder 2. After the component is lifted into place, the inner surface of the frame can evenly adhere to the outer wall of the horizontal drying cylinder 2, maximizing the magnetic field coupling area between the induction cable and the cylinder, and improving the conversion efficiency of electromagnetic energy to heat energy in the cylinder. Positioning slots are evenly spaced along the upper edge of the arc-shaped beam of the support frame 5-1. The induction cables 5-2 are arranged in a neat, layered spiral pattern along these slots. The slots reliably limit and fix the induction cables 5-2, preventing cable slippage and stacking during equipment operation and effectively avoiding the risk of short circuits. The uniform spacing of the cable spirals ensures a balanced distribution of the magnetic field strength in the heat exchange area of ​​the cylinder. Shielded leads are extended from both ends of the induction cables 5-2 inside each electromagnetic induction heating assembly 5, connecting to the power output ports of the corresponding electromagnetic induction intelligent heating power supply unit 9. Each heating power supply unit 9 adjusts the high-frequency output power of its induction cable 5-2 individually based on the cylinder wall temperature signal collected and transmitted by the temperature sensing element 13, ultimately achieving precise axial segmented temperature control of the drying cylinder.

[0054] In this embodiment, the temperature sensing element 13 includes a metal sleeve 13-1, a sleeve spring lug 13-2, a locking nut 13-3, a nut spring lug 13-4, and a tension spring 13-5. The metal sleeve 13-1 is fixedly installed on the support frame 5-1 of the electromagnetic induction heating assembly 5. The threaded section of the temperature sensing element 13 is fitted with the locking nut 13-3. The sleeve spring lug 13-2 is connected to the nut spring lug 13-4 through the tension spring 13-5. The tension spring 13-5 provides a continuous spring preload to the temperature sensing element 13, so that the probe end of the temperature sensing element 13 is always tightly attached to the outer wall of the horizontal drying cylinder 2.

[0055] Specifically, as shown in Figure 7, the temperature sensing element 13 adopts a spring-preloaded floating installation structure, which is a key detection component for achieving precise temperature control of the cylinder sections. This structure differs from traditional welded fixed thermocouples; the entire assembly can be quickly disassembled and installed, facilitating maintenance and replacement. The metal sleeve 13-1 and sleeve spring lug 13-2 form a fixed base, while the locking nut 13-3 and nut spring lug 13-4 float synchronously with the temperature sensing probe. The tension spring 13-5 provides continuous pre-tightening pressure. The coordinated operation of these structures ensures a seamless fit between the temperature sensing probe and the drying cylinder wall, eliminating temperature measurement distortion. The metal sleeve 13-1 is horizontally fixed to the frame beam of the support frame 5-1. The hollow interior of the sleeve forms a guide channel for the temperature sensing element 13, restricting the probe to extend and retract only along the sleeve axis, effectively preventing lateral displacement and vertical swaying of the temperature sensing element. The sleeve is made entirely of non-magnetic stainless steel, avoiding induced heating due to the magnetic field of the induction cable and ensuring the stability of the temperature measurement data. The middle section of the temperature sensing element 13 has an external thread structure. The locking nut 13-3 is threaded onto this threaded section, and its axial installation position on the probe can be adjusted along the thread. The locking nut 13-3 acts as a spring tension bearing, providing a mounting fulcrum for the spring lugs 13-4 on both sides, and also limits the maximum extension stroke of the temperature sensing element, preventing excessive pressure on the cylinder from causing deformation or damage. Two sets of sleeve spring lugs 13-2 are symmetrically welded to the outer wall of the metal sleeve 13-1, and two sets of spring lugs 13-4 are symmetrically welded to both sides of the locking nut 13-3. Tension springs 13-5 are installed one-to-one between the two sets of lugs on the same side. The symmetrical tension of the springs on both sides ensures that the temperature sensing element is subjected to balanced force, effectively preventing unilateral tilting or offset of the probe, and ensuring that the probe end face is intact and stably adheres to the outer wall of the drying cylinder. During equipment assembly, the tension spring 13-5 is pre-stretched to form a stable pre-tightening force, which can continuously pull the locking nut 13-3 towards the cylinder, causing the probe end of the temperature measuring element 13 to always be tightly pressed against the metal outer wall of the horizontal drying cylinder 2, eliminating the air insulation gap between the probe and the outer wall of the cylinder.

[0056] Even if the cylinder undergoes slight deformation due to heat or there are minor assembly deviations in the heating components, the tension spring can still maintain the probe's contact state through adaptive extension and contraction, allowing for real-time acquisition of the cylinder's actual wall temperature and effectively ensuring the detection accuracy and control stability of the closed-loop temperature control in each zone.

[0057] In this embodiment, the high-precision dust filter 7 is internally equipped with a high-temperature metal filter bag 7-1; the high-temperature metal filter bag 7-1 is made of high-temperature alloy metal fiber sintered material.

[0058] Specifically, as shown in Figure 2, the high-precision dust filter 7 is vertically installed at the top of the horizontal drying cylinder 2, biased towards the feed inlet side, to capture fine powder particles carried by the drying exhaust gas. The core filter element is a high-temperature metal filter bag 7-1, abandoning the traditional non-metallic filter bag structure, and is suitable for the high-temperature exhaust gas conditions of powder drying; the filter bag is vertically suspended within the filter cavity, arranged to form a dense filtration array. The humid exhaust gas generated during the drying process passes through the filter bag from bottom to top to complete gas-solid separation. The trapped powder is backflowed into the drying cylinder for recovery via pulse backflushing, and the exhaust gas is purified before being discharged in compliance with standards. Figure 8 As shown, this filter bag is formed using a high-temperature alloy metal fiber non-woven integrated sintering process. The overall design is a cylindrical structure with a filtration accuracy better than 1μm. It can withstand long-term operating temperatures exceeding 200℃, and its high-temperature resistance is highly compatible with the exhaust gas conditions of the drying cylinder. The material contains no organic fibers, eliminating the risk of fiber shedding and contamination of the high-purity drying powder. It also features wear resistance, corrosion resistance, and stable air permeability. Compressed inert gas can be introduced for periodic pulse backflushing cleaning, enabling long-term cyclic use, effectively extending the filter's service life and significantly reducing the frequency of filter bag replacement and maintenance costs.

[0059] In this embodiment, for the silicon powder drying scenario in polysilicon production, the horizontal drying cylinder 2 is made of magnetically conductive carbon steel plate, and the inner wall of the horizontal drying cylinder 2, the material contact working surfaces of the central shaft 3-1 and the fan-shaped blades 3-2 are all covered with tungsten carbide wear-resistant coating; for the high-purity powder drying scenario of new energy battery materials, the horizontal drying cylinder 2 is made of magnetically conductive carbon steel base lined with stainless steel plate, and the central shaft 3-1 and the fan-shaped blades 3-2 are both made of stainless steel; and the inner wall of the horizontal drying cylinder 2, the surface of the central shaft 3-1 and the fan-shaped blades 3-2 are all polished.

[0060] Specifically, the polycrystalline silicon powder has a Mohs hardness of up to 7, exhibiting extremely strong abrasive and grinding properties. The cylinder body is made of magnetically conductive carbon steel plate, where an alternating magnetic field efficiently generates electromagnetic eddy currents on the carbon steel substrate, enabling the cylinder body to rapidly heat up and meet the requirements of heating applications. The material contact surfaces of the inner wall of the cylinder, the central shaft 3-1, and the fan-shaped blades 3-2 are all coated with a tungsten carbide wear-resistant coating applied by supersonic flame spraying, with a coating thickness controlled at 0.15~0.3mm. Utilizing the high hardness of tungsten carbide, this coating can withstand long-term erosion and abrasion from the silicon powder, reducing the risk of wear and perforation of the cylinder body and stirring blades, and significantly extending the service life of the cylinder body and stirring components.

[0061] High-purity powders such as lithium battery positive and negative electrode materials are highly sensitive to iron and heavy metal impurities. Even trace amounts of iron foreign matter can directly affect the quality of the powder product and pose safety risks in battery cell applications. To address this, the present invention employs a double-layer composite structure for the cylinder body: the outer layer uses a magnetically conductive carbon steel substrate to provide an eddy current heating matrix for electromagnetic induction heating, ensuring heating efficiency; the inner lining is made of stainless steel to isolate the carbon steel substrate from the powder material, preventing iron particles from being mixed into the material due to wear and corrosion of the carbon steel substrate. The central shaft 3-1 and the fan-shaped blades 3-2 are both integrally machined from stainless steel, avoiding iron contamination of the powder from carbon steel corrosion and peeling at the structural material source. The inner wall of the stainless steel lining, the stainless steel central shaft, and the fan-shaped blades are all mirror-polished, with a surface roughness controlled to Ra≤0.4μm. The mirror-polished working surface reduces the probability of powder adhesion, reduces material clumping, effectively inhibits cross-contamination between different batches of material, and ensures the stability of the high-purity powder product quality.

[0062] In this embodiment, the lifting mechanism 12 is a hand-cranked worm gear screw structure; when the hand-cranked drive screw lifts the electromagnetic induction heating component 5, the support frame 5-1 is attached to the outer wall of the horizontal drying cylinder 2 to ensure magnetic field coupling efficiency; when the hand-cranked drive screw descends, the electromagnetic induction heating component 5 is detached from the horizontal drying cylinder 2, and the electromagnetic induction heating component 5 can be removed for inspection and replacement.

[0063] Specifically, the lifting mechanism 12 is used to support the electromagnetic induction heating component 5 and drive it to quickly adhere to and detach from the outer wall of the cylinder. Each set of lifting mechanisms 12 is installed at one of the four corners of the bottom of each electromagnetic induction heating component 5. This mechanism adopts a worm gear screw drive structure with self-locking performance: after manual adjustment stops, the screw height can be automatically locked, effectively preventing the heating component from falling or shifting during equipment operation. No additional locking buckle components are required, making the structure simple and reliable. Rotating the handwheel clockwise drives the screw upwards via the worm gear pair, raising the arc-shaped support frame 5-1 until it adheres to the outer wall of the horizontal drying cylinder 2, ensuring that the inner arc surface of the support frame and the outer wall of the insulation layer remain in close contact. This structure reduces the air gap between the induction cable 5-2 and the magnetically conductive cylinder wall of the horizontal drying cylinder 2, reducing high-frequency magnetic field energy loss, improving the electromagnetic eddy current heat energy conversion efficiency, and ensuring the cylinder's heating rate and stability. When the handwheel is turned counterclockwise, the lead screw retracts and moves downward, completely separating the support frame 5-1 from the insulation layer 10, leaving sufficient horizontal movement clearance. The electromagnetic induction heating component 5 can be moved out of the main equipment area without disassembling the entire machine, making it easier for operators to replace and repair components such as the induction cable 5-2 and the temperature measuring element 13, greatly reducing equipment downtime for maintenance.

[0064] In this embodiment, each group of electromagnetic induction heating components 5 is independently powered and temperature-controlled; the electromagnetic induction intelligent heating power supply host 9 of each group individually adjusts the output power and set temperature of the corresponding electromagnetic induction heating component 5, realizing zoned gradient temperature control of the horizontal drying cylinder 2 along the material conveying direction. When a certain group of electromagnetic induction heating components 5 malfunctions, that branch can be shut down for maintenance, while the remaining electromagnetic induction heating components 5 maintain normal operation, ensuring continuous production of the entire drying equipment.

[0065] Specifically, this invention abandons the traditional integrated heating and unified temperature control design of drying equipment, and sets up multiple sets of electromagnetic induction heating components 5 arranged sequentially along the axial direction of the horizontal drying cylinder 2 as independent electrical units. Each heating component is equipped with a dedicated power supply circuit and temperature control system, and the circuits and temperature control logic between the groups are isolated from each other and do not interfere with each other, laying the hardware foundation for differentiated heating of the cylinder in sections along the axial direction and continuous production under fault isolation. Each set of electromagnetic induction heating components 5 is equipped with a dedicated electromagnetic induction intelligent heating power supply host 9, which receives the cylinder wall temperature feedback signal collected by the temperature measuring element 13 of its group in real time.

[0066] Operators can set target temperatures for each section of the drying cylinder according to the drying process requirements of high moisture content at the material inlet and low moisture content at the outlet. The power supply unit automatically matches and adjusts the high-frequency output power to create a gradient heating temperature field from the inlet section to the outlet section of the cylinder. This adapts to the heat requirements of the entire powder dehydration and drying process, effectively avoiding the problems of local over-drying and under-drying, while reducing energy loss caused by ineffective heating. When any set of electromagnetic induction heating components 5 experiences cable damage, temperature measurement failure, or other malfunctions, it is only necessary to disconnect the power supply circuit of the corresponding electromagnetic induction intelligent heating power supply unit 9 without shutting down the entire drying equipment. Subsequently, the faulty heating component can be lowered and detached from the outer wall of the cylinder using the lifting mechanism 12, and moved out of the main unit area for maintenance and replacement. The remaining heating components continue to be powered on normally, maintain closed-loop temperature control, and continuously output a high-frequency alternating magnetic field, so that the horizontal drying cylinder 2 continues to heat up. The feeding, stirring, and discharging processes inside the cylinder are all uninterrupted, greatly reducing production line downtime losses caused by equipment failure and ensuring continuous and stable operation of industrial mass production.

[0067] As shown in Figure 9, this is the process flow of the present invention. Based on the above structural description, the overall operating principle of the present invention is explained as follows: Pre-treatment stage: Lift all electromagnetic induction heating components 5 by operating the lifting mechanism 12, so that the arc-shaped tile surface of the electromagnetic induction heating components 5 is in contact with the outer wall of the horizontal drying cylinder 2; start the exhaust fan 8, and complete the airflow distribution through the pipeline airflow regulating butterfly valve: one airflow draws out the exhaust gas inside the horizontal drying cylinder 2 after being filtered and purified by the high-precision dust filter 7, so that a stable micro-negative pressure drying environment is formed inside the horizontal drying cylinder 2; the other airflow is guided to the ventilation interface at the bottom of the protective cover 6 to cool the induction cable 5-2.

[0068] Preheating stage of the drying cylinder: The independently configured electromagnetic induction intelligent heating power supply host 9 of each group is turned on to output high-frequency electrical energy; after the high-frequency electrical energy is connected to the induction cable 5-2 of the corresponding electromagnetic induction heating component 5, a high-frequency alternating magnetic field is generated. The alternating magnetic field penetrates the insulation layer 10, causing electromagnetic eddy currents to be induced in the magnetically conductive cylinder wall of the horizontal drying cylinder 2, and the drying cylinder wall itself heats up due to the eddy current heating effect.

[0069] Each group of temperature measuring elements 13 is tightly attached to the outer wall of the horizontal drying cylinder 2 by means of a spring pre-tightening structure, collects the cylinder wall temperature parameters in real time, and transmits the temperature signal back to the electromagnetic induction intelligent heating power supply host 9 matched in the same group; the electromagnetic induction intelligent heating power supply host 9 independently adjusts its high-frequency output power according to the set temperature value, builds a segmented gradient temperature field along the material conveying axis of the horizontal drying cylinder 2, and completes the differentiated preheating operation of the cylinder zone.

[0070] Continuous powder feeding and drying stage: The transmission system 4 is started, driving the single-shaft rotary agitator 3 to rotate at a uniform speed; wet powder is fed into the inner cavity of the horizontal drying cylinder 2 from the feed port at the top front end; the fan-shaped rotary blades 3-2 on the central shaft 3-1 rotate synchronously with the main shaft, continuously turning and loosening the wet powder, and smoothly conveying the material along the axial direction of the horizontal drying cylinder 2 to the discharge end, constantly updating the heat-receiving contact surface between the powder and the high-temperature cylinder wall, effectively improving the overall heating uniformity of the powder. The radial triangular reinforcing ribs 3-3 on the back of the fan-shaped rotary blades 3-2 and the triangular support flat steel 3-4 on the front node work together to enhance the overall structural strength and resistance to material impact of the blades; a small amount of powder that enters the inner side of the shaft end baffle ring 11 is pushed back into the drying cavity of the cylinder by the reverse spiral blades 3-5 on the central shaft 3-1, effectively alleviating the wear problem of the shaft end sealing structure caused by powder intrusion and extending the service life of the sealing components. The horizontal drying cylinder 2 heats and dries the powder inside the cylinder by its own heating effect of electromagnetic induction eddy current.

[0071] Dust recovery stage: The dust-laden exhaust gas generated during powder dehydration and drying flows upward under the negative pressure of the exhaust fan 8 and enters the high-precision dust filter 7 installed at the top of the horizontal drying cylinder 2. When the dust-laden exhaust gas flows through the high-temperature metal filter bag 7-1 inside the filter, the fine powder carried by the airflow is intercepted by the filter bag and adheres to the outer surface of the filter bag; the pulse jet cleaning system configured in the filter injects inert gas at a preset cycle for pulse reverse cleaning, and the powder accumulated on the outer wall of the filter bag is shaken off by the impact force of the reverse airflow, and the powder falls back into the drying chamber of the cylinder for further drying. The dust-cleaned exhaust gas is then extracted and discharged by the exhaust fan 8.

[0072] Continuous discharge stage of finished product: After the powder is heated by the multi-section gradient temperature control in the cylinder and the moisture content reaches the process index, it forms qualified dry powder. Under the continuous axial pushing action of the fan-shaped rotary blades 3-2, the dry powder is continuously discharged from the discharge port at the bottom end of the horizontal drying cylinder 2, completing the whole set of powder drying operations.

[0073] The principle of uninterrupted operation and maintenance during equipment failure: During normal operation, if any electromagnetic induction heating component 5 experiences a circuit malfunction or temperature measurement failure, simply disconnect the power supply circuit of the corresponding electromagnetic induction intelligent heating power supply unit 9; then, operate the lifting mechanism 12 to lower the faulty electromagnetic induction heating component 5, detaching it from the horizontal drying cylinder 2, and then move the component out of the main unit area by lateral translation, allowing for maintenance and spare parts replacement. The remaining electromagnetic induction heating components 5 maintain independent power supply and zoned closed-loop temperature control, continuously generating an alternating magnetic field to heat the cylinder through eddy currents; the transmission system 4, feeding and discharging system, and dust removal and ventilation systems all operate uninterruptedly, allowing the drying equipment to continue production and avoiding the capacity loss and economic losses caused by a complete shutdown. Example 2

[0074] Referring to Figure 10, Embodiment 2 of the present invention also provides a method for drying a single-axis rotary blade using electromagnetic induction heating, comprising: S1. Lift all electromagnetic induction heating components to fit against the outer wall of the horizontal drying cylinder using the lifting mechanism; start the exhaust fan and distribute two airflows by adjusting the butterfly valve. One airflow draws out the exhaust gas inside the horizontal drying cylinder to maintain a slightly negative pressure drying environment; the other airflow enters the protective cover to cool the induction cable. S2. Turn on the electromagnetic induction intelligent heating power supply of each group. Based on the cylinder wall temperature collected by the temperature measuring elements of each group, adjust the heating power of the corresponding electromagnetic induction heating components of each group. Set gradient preheating temperatures along the material conveying direction to complete the zoned differentiated preheating of the horizontal drying cylinder. S3. Start the transmission system to drive the single-shaft rotary blade stirring mechanism to rotate at a constant speed; the wet powder is fed into the inner cavity of the horizontal drying cylinder from the feed port at the top front end; the fan-shaped rotary blades tumble, loosen and axially push the wet powder; the reverse spiral blades at the shaft end push the powder that has entered the gap of the shaft end baffle ring back into the drying cavity of the cylinder; the horizontal drying cylinder heats and dries the wet powder inside the cylinder by generating heat itself through electromagnetic induction eddy current effect. S4. The dust-laden exhaust gas generated during the drying process enters the high-precision dust removal filter upwards, and the fine powder in the exhaust gas is intercepted by the high-temperature metal filter bag; the intercepted fine powder falls back into the horizontal drying cylinder through pulse backflushing, realizing powder recycling; the exhaust gas purified by the high-precision dust removal filter is extracted and discharged by the exhaust fan. S5. The dried powder that meets the drying standard is continuously discharged from the discharge port at the bottom end of the horizontal drying cylinder, completing the entire powder drying operation.

[0075] In this embodiment, in step S1, all electromagnetic induction heating components are lifted by the lifting mechanism to fit against the outer wall of the horizontal drying cylinder; the exhaust fan is started, and two airflows are distributed by adjusting the butterfly valve. One airflow draws out the exhaust gas inside the horizontal drying cylinder to maintain a slightly negative pressure drying environment in the horizontal drying cylinder; the other airflow flows into the protective cover to cool the induction cable.

[0076] Specifically, before the formal drying operation, the electromagnetic induction heating components are assembled and positioned. The lifting mechanism is used to raise each set of electromagnetic induction heating components, ensuring the inner arc surface of the supporting frame fits tightly against the outer surface of the horizontal drying cylinder. This reduces the distance between the induction cable and the magnetically conductive wall of the cylinder, ensuring efficient magnetic field coupling. Then, the exhaust fan is started, and airflow is distributed through the pipeline airflow regulating butterfly valve. One airflow path draws out the exhaust gas from inside the drying cylinder after filtration and purification by a high-precision dust filter, creating a stable micro-negative pressure drying environment inside the horizontal drying cylinder. This prevents dust from escaping from the feed inlet and shaft end gaps, while also promptly removing moisture generated during powder drying. The other airflow path is directed to the ventilation interface at the bottom of the protective cover. The airflow circulates inside the cover, passing through each set of electromagnetic induction heating components, continuously carrying away the heat generated by the induction cable through convection heat transfer. This structure relies on a single fan to simultaneously achieve exhaust gas extraction and induction cable cooling, eliminating the need for additional dedicated cooling fans, simplifying equipment and reducing overall energy consumption.

[0077] In this embodiment, in step S2, the electromagnetic induction intelligent heating power supply host of each group is turned on, and the heating power of the corresponding electromagnetic induction heating component of each group is adjusted according to the temperature of the cylinder wall collected by the temperature measuring element of each group. The gradient preheating temperature is set in the partition along the material conveying direction to complete the partitioned differential preheating of the horizontal drying cylinder.

[0078] Specifically, each group of independently equipped electromagnetic induction intelligent heating power supplies is activated sequentially. Alternating current flows through the induction cables, generating a high-frequency alternating magnetic field. This magnetic field penetrates the outer insulation layer of the horizontal drying cylinder, causing the magnetically conductive metal cylinder wall to heat up autonomously under the eddy current heating effect. The temperature sensing element of each electromagnetic induction heating assembly is tightly attached to the outer wall of the cylinder via a spring-pre-tightened structure, collecting the actual temperature of the cylinder wall in the corresponding temperature control section in real time and feeding the temperature signal back to the corresponding power supply unit. Operators can set differentiated preheating temperatures for each section along the feeding to discharging conveying path according to the powder drying process, individually adjusting the output power of each heating assembly to create a gradient temperature field along the cylinder's axial direction, thus matching the heat load requirements of the powder with high moisture content in the front section and low moisture content in the rear section. Once the cylinder wall temperature in each section is stably maintained at its respective process setting value, the cylinder's zoned preheating process is complete, providing a stable heat source for continuous powder drying.

[0079] In this embodiment, in step S3, the transmission system is started to drive the single-shaft rotary blade stirring mechanism to rotate at a constant speed; the wet powder is fed into the inner cavity of the cylinder from the feed port at the top front end of the horizontal drying cylinder; the fan-shaped rotary blades continuously tumble, loosen and axially push the wet powder; the reverse spiral blades provided at the shaft end push the powder that has entered the gap of the shaft end baffle ring back into the drying cavity of the cylinder; the horizontal drying cylinder heats and dries the wet powder inside the cylinder by generating heat itself through the electromagnetic eddy current effect.

[0080] Specifically, after the preheating process is completed, the transmission system is started, which drives the central shaft to rotate at a constant speed, and the fan-shaped blades arranged in a spiral on the shaft rotate synchronously. The wet powder continuously falls into the horizontal drying cylinder from the front feed port. The fan-shaped blades continuously shear and tumble the powder, breaking up agglomerated materials and constantly updating the heat exchange interface between the powder and the high-temperature cylinder wall. At the same time, the powder is slowly conveyed axially towards the discharge end by relying on the spiral angle. When a small amount of powder enters the cavity of the baffle ring at the shaft end, the reverse spiral blades that rotate synchronously with the main shaft generate a reverse thrust, pushing the powder back into the main drying chamber of the cylinder, thereby reducing the amount of powder entering the shaft end sealing cavity and avoiding wear on the sealing structure. The electromagnetic induction heating component generates an alternating magnetic field, which causes eddy currents in the metal cylinder wall of the horizontal drying cylinder through magnetic field coupling, resulting in self-heating. The heat from the cylinder wall is directly transferred to the wet powder inside the cylinder, achieving efficient dehydration and drying of the material.

[0081] In this embodiment, in step S4, the dust-laden exhaust gas generated during drying enters the high-precision dust removal filter upwards, and the high-temperature metal filter bag intercepts the fine powder in the exhaust gas; the fine powder is backflushed back into the cylinder by pulse backflushing to achieve recovery; the exhaust gas purified by the high-precision dust removal filter is discharged externally through the exhaust fan and its external pipeline.

[0082] Specifically, the water vapor released during powder drying mixes with suspended fine dust to form dust-laden exhaust gas. Under slight negative pressure inside the cylinder, this gas flows upward and converges at the high-precision dust filter at the top of the cylinder. The exhaust gas passes through a cylindrical high-temperature metal filter bag inside the filter. The filter material, with a filtration precision of less than 1μm, traps the fine powder carried in the exhaust gas, while the humid gas is discharged upward through the filter bag. The filter is equipped with a pulse controller that periodically sprays pressurized inert gas for drying. The airflow impacts the powder adhering to the outer surface of the filter bag, causing it to detach and fall back into the cylinder to continue drying, reducing material loss. The purified dust-free exhaust gas flows along the duct into the exhaust fan, which discharges it externally, meeting the process requirements for material recovery and environmental dust removal in the workshop.

[0083] In this embodiment, in step S5, the dried powder is discharged through the discharge port at the bottom end of the horizontal drying cylinder.

[0084] Specifically, the powder undergoes multi-stage gradient heating and continuous tumbling and dehydration inside the cylinder. Once the moisture content reaches the process qualification standard, it gradually moves to the end area of ​​the cylinder under the continuous axial pushing action of the fan-shaped blades. A finished product discharge port is opened at the bottom end of the cylinder. The qualified dried powder is continuously discharged from the discharge port under the combined action of its own gravity and the pushing force of the fan-shaped blades. It can be directly connected to the downstream conveying and storage process, realizing the integrated automated production of continuous feeding, drying and finished product discharge of wet powder.

[0085] In this embodiment, when a single electromagnetic induction heating component fails, the corresponding electromagnetic induction intelligent heating power supply host is shut down; the faulty electromagnetic induction heating component is detached from the horizontal drying cylinder by the lifting mechanism for repair or replacement, while the remaining electromagnetic induction heating components continue to operate and produce without interruption.

[0086] The application scenarios of this invention are as follows: In the drying of polycrystalline silicon powder, this invention uses an electromagnetic induction cylinder for direct heating and a tungsten carbide wear-resistant coating structure, which can withstand the long-term erosion of high-hardness silicon powder and eliminate the risk of heat exchange medium leakage and contamination of silicon powder; at the same time, the equipment is an atmospheric pressure structure, which simplifies the relevant control requirements for pressure vessels.

[0087] In the scenario of high-purity lithium carbonate powder concentration and drying for new energy battery raw materials, this invention adopts a carbon steel inner stainless steel cylinder and is equipped with a polished stirring component to reduce the risk of metal impurities being mixed into the powder; multiple independent heating units can match the heating needs of different stages of powder drying, and can be equipped with metal filter bags to realize the recovery of fine powder.

[0088] In the continuous mass production drying scenario of highly grindable and high-purity inorganic powders, this invention eliminates the need for heat transfer oil and steam-related pipeline systems, resulting in a smaller overall machine footprint. When a single heating component fails, there is no need to shut down the entire production line, ensuring continuous operation of the production line and reducing production capacity losses caused by equipment maintenance.

[0089] In powder drying scenarios requiring low oxygen and inert gas protection, this invention establishes a slightly negative pressure environment inside the cylinder using an exhaust fan, combined with an integrated dust removal structure to reduce dust overflow; the equipment has no pressure-bearing heat exchange chamber, eliminating workshop safety hazards caused by high-temperature and high-pressure medium leakage.

[0090] In industrial production lines for powder drying with high maintenance frequency, the heating component of this invention is equipped with a lifting and sliding structure, so the drying host does not need to be disassembled for disassembly and maintenance; the matching induced draft fan is equipped with a diversion and reuse pipeline to take into account both exhaust gas extraction and component air cooling, so there is no need to configure an additional independent cooling fan, reducing the workload of auxiliary machine maintenance.

[0091] The present invention has been described in a relatively specific and detailed manner above through general description and specific embodiments.

[0092] It should be understood that those skilled in the art can make several conventional adjustments or further improvements to these specific embodiments based on the technical concept of the present invention; however, as long as they do not depart from the technical concept of the present invention, the technical solutions obtained by these conventional adjustments or further improvements also fall within the protection scope of the claims of the present invention.

Claims

1. A single-axis rotary blade drying device with electromagnetic induction heating, characterized in that, It includes a mounting base (1), a horizontal drying cylinder (2), a single-shaft rotary blade stirring mechanism (3), a transmission system (4), an electromagnetic induction heating component (5), a protective cover (6), a high-precision dust filter (7), an exhaust fan (8), an electromagnetic induction intelligent heating power supply unit (9), an insulation layer (10), a shaft end retaining ring (11), a lifting mechanism (12), and a temperature measuring element (13); The horizontal drying cylinder (2) is a horizontal atmospheric pressure cylindrical structure and is fixedly installed above the mounting base (1); the outer wall of the horizontal drying cylinder (2) is covered with the insulating insulation layer (10); the lower half of the arc-shaped wall of the horizontal drying cylinder (2) is the main heating area, and a number of electromagnetic induction heating components (5) are arranged on the outside of the insulating insulation layer (10) corresponding to the main heating area, and the electromagnetic induction heating components (5) are covered with the protective cover (6); the single-shaft rotary blade stirring mechanism (3) is arranged through the interior of the horizontal drying cylinder (2), and the driving end of the single-shaft rotary blade stirring mechanism (3) is connected to the transmission system (4), and the transmission system (4) is fixedly installed on the mounting base (1); The high-precision dust filter (7) is mounted on the top of the horizontal drying cylinder (2) near the feed inlet. The exhaust pipe of the high-precision dust filter (7) is connected to the exhaust fan (8). The exhaust fan (8) is provided with a diversion and reuse pipeline at its inlet end. The first branch of the diversion and reuse pipeline is connected to the high-precision dust filter (7), and the second branch of the diversion and reuse pipeline is connected to the inside of the protective cover (6). Each electromagnetic induction heating component (5) is independently and electrically connected to a set of electromagnetic induction intelligent heating power supply host (9); each set of electromagnetic induction heating components (5) is provided with four sets of lifting mechanisms (12) at the bottom. The bottom end of the lifting mechanism (12) is fixed to the mounting base (1), and the top end is fixedly connected to the support frame (5-1) of the electromagnetic induction heating component (5). The lifting mechanism (12) is used to drive the electromagnetic induction heating component (5) to fit or detach from the outer wall of the horizontal drying cylinder (2); each set of electromagnetic induction heating components (5) is provided with a temperature measuring element (13). The probe end of the temperature measuring element (13) is close to the outer wall of the horizontal drying cylinder (2), and the signal output end of the temperature measuring element (13) is electrically connected to the temperature control end of the corresponding electromagnetic induction intelligent heating power supply host (9).

2. The electromagnetic induction heating single-axis rotary blade drying device according to claim 1, characterized in that, The single-axis rotary blade stirring mechanism (3) includes a central shaft (3-1), fan-shaped rotary blades (3-2), radial triangular reinforcing ribs (3-3), nodal triangular support flat steel (3-4), and reverse spiral blades (3-5); several sets of fan-shaped rotary blades (3-2) are spirally arranged on the central shaft (3-1), and several fan-shaped rotary blades (3-2) are evenly arranged within the same spiral lead; three radial triangular reinforcing ribs (3-5) are provided on the side of the fan-shaped rotary blade (3-2) facing away from the material force. 3); The root of the fan-shaped blade (3-2) facing the material force side is provided with the node triangular support flat steel (3-4); The end caps at both ends of the horizontal drying cylinder (2) are coaxially provided with the shaft end baffle ring (11); The central shaft (3-1) section corresponding to the inner side of the shaft end baffle ring (11) is provided with the reverse spiral blade (3-5); There is a set gap between the outer edge of the reverse spiral blade (3-5) and the inner wall of the shaft end baffle ring (11).

3. The electromagnetic induction heating single-axis rotary blade drying device according to claim 2, characterized in that, The electromagnetic induction heating assembly (5) includes a support frame (5-1) and an induction cable (5-2); the support frame (5-1) is made of antistatic phenolic paperboard or a material with equivalent performance, and the curvature of the top arc surface of the support frame (5-1) is adapted to the outer wall of the horizontal drying cylinder (2); the arc-shaped frame beam of the support frame (5-1) is provided with uniformly distributed slots, and the induction cable (5-2) is spirally wound uniformly along the slots; the two ends of the induction cable (5-2) are connected to the output end of the corresponding electromagnetic induction intelligent heating power supply host (9).

4. The electromagnetic induction heating single-axis rotary blade drying device according to claim 3, characterized in that, The temperature measuring element (13) includes a metal sleeve (13-1), a sleeve spring lug (13-2), a locking nut (13-3), a nut spring lug (13-4), and a tension spring (13-5). The metal sleeve (13-1) is fixedly installed on the support frame (5-1) of the electromagnetic induction heating assembly (5). The threaded section of the temperature measuring element (13) is fitted with the locking nut (13-3). The tension spring (13-5) is connected between the sleeve spring lug (13-2) and the nut spring lug (13-4). The tension spring (13-5) provides preload to the temperature measuring element (13) so that the probe end of the temperature measuring element (13) is in close contact with the outer wall of the horizontal drying cylinder (2).

5. The electromagnetic induction heating single-axis rotary blade drying device according to claim 4, characterized in that, The high-precision dust filter (7) is internally equipped with a high-temperature metal filter bag (7-1); the high-temperature metal filter bag (7-1) is made of high-temperature alloy metal fiber sintered material.

6. The electromagnetic induction heating single-axis rotary blade drying device according to claim 5, characterized in that, The horizontal drying cylinder (2), the central shaft (3-1), and the fan-shaped blades (3-2) are configured using any of the following material and structural schemes: Option 1: The horizontal drying cylinder (2) is made of magnetic carbon steel plate, and the inner wall of the horizontal drying cylinder (2), the central shaft (3-1) and the material contact working surface of the fan-shaped blades (3-2) are all covered with tungsten carbide coating. Option 2: The horizontal drying cylinder (2) is made of magnetic carbon steel lined with stainless steel plate, and the central shaft (3-1) and the fan-shaped blades (3-2) are both made of stainless steel; the inner wall of the horizontal drying cylinder (2), the surface of the central shaft (3-1) and the fan-shaped blades (3-2) are all polished.

7. The electromagnetic induction heating single-axis rotary blade drying device according to claim 6, characterized in that, The lifting mechanism (12) is a hand-cranked worm gear screw structure; the lifting mechanism (12) is used to drive the electromagnetic induction heating component (5) to rise and fall, so that the electromagnetic induction heating component (5) is attached to or detached from the outer wall of the horizontal drying cylinder (2).

8. The electromagnetic induction heating single-axis rotary blade drying device according to claim 7, characterized in that, Each electromagnetic induction heating component (5) in each group is independently powered and independently temperature controlled; each electromagnetic induction intelligent heating power supply host (9) in each group can individually adjust the output power and set temperature of the corresponding electromagnetic induction heating component (5).

9. A method for drying a single-axis rotary blade using electromagnetic induction heating, characterized in that, Includes the following steps: The lifting mechanism (12) raises all the electromagnetic induction heating components (5) so that the electromagnetic induction heating components (5) fit against the outer wall of the insulation layer (10) on the outside of the horizontal drying cylinder (2); the exhaust fan (8) is started and two air flows are distributed by adjusting the butterfly valve. One air flow draws the exhaust gas inside the horizontal drying cylinder (2) so that the inside of the horizontal drying cylinder (2) maintains a slightly negative pressure drying environment; the other air flow enters the protective cover (6) to cool the induction cable (5-2); the electromagnetic induction intelligent heating power supply host (9) of each group is turned on, and the heating power of the corresponding electromagnetic induction heating components (5) is adjusted according to the cylinder wall temperature collected in real time by each group of temperature measuring elements (13). The gradient preheating temperature is set in the partition along the material conveying direction to perform partitioned differential preheating of the horizontal drying cylinder (2); Start the transmission system (4) to drive the single-shaft rotary stirring mechanism (3) to rotate at a constant speed; the wet powder is fed into the inner cavity of the cylinder from the feed port at the top front end of the horizontal drying cylinder (2); the fan-shaped rotary blades (3-2) continuously tumble, loosen and axially push the wet powder; the reverse spiral blades (3-5) push the powder that has entered the shaft end baffle ring (11) back into the drying cavity of the cylinder; the electromagnetic induction heating component (5) uses the electromagnetic induction eddy current effect to make the metal cylinder wall of the horizontal drying cylinder (2) heat up itself, and relies on the heat generated by the cylinder wall to heat and dry the wet powder in the cylinder; The dust-laden exhaust gas generated during the drying process rises into the high-precision dust filter (7), and the fine powder in the exhaust gas is intercepted by the high-temperature metal filter bag (7-1); the intercepted fine powder falls back into the horizontal drying cylinder (2) through pulse backflushing to achieve powder recovery; the exhaust gas purified by the high-precision dust filter (7) is extracted by the exhaust fan (8) and discharged to the outside. The dried powder is discharged from the discharge port at the bottom end of the horizontal drying cylinder (2).

10. The electromagnetic induction heating single-axis rotary blade drying method according to claim 9, characterized in that, When a single electromagnetic induction heating component (5) malfunctions, the corresponding electromagnetic induction intelligent heating power supply host (9) is shut down; the malfunctioning electromagnetic induction heating component (5) is lifted off the horizontal drying cylinder (2) by the lifting mechanism (12) for maintenance or replacement; the remaining electromagnetic induction heating components (5) maintain normal operation and run continuously.

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