Hot air type roller scraper dryer

Abstract

The invention discloses a hot air type roller scraper dryer, and belongs to the technical field of scraper dryers, the hot air type roller scraper dryer comprises a roller, the roller is communicated with an air heater, the air heater is used for providing hot air for the roller, and the inner wall of the roller is provided with a graphene coating; the roller is provided with a roller air inlet and a roller air outlet; the air heater is provided with a natural air inlet, a circulating air inlet and an air outlet; the machine air outlet communicates with the cylinder air inlet through a first pipeline, and the cylinder air outlet communicates with the circulating air inlet through a second pipeline. Electric energy is efficiently utilized, the electric energy is converted into kinetic energy through a motor, the kinetic energy rubs air through high-speed rotation of an impeller to generate high-temperature hot air, the high-temperature hot air is transferred to a graphene coating in the roller, and heat is quickly transferred to the outer surface of the roller through the high heat conduction performance of graphene; compared with a traditional roller drying machine which utilizes an electric stove wire, an electric heating rod, steam and a heat conduction oil boiler, energy is saved by 50%.

Description

Technical Field

[0001] The invention belongs to the technical field of scraper dryers, and in particular relates to a hot air type drum scraper dryer. Background Art

[0002] A scraper drum dryer, also known as a scraper drum dryer or rotary drum dryer, is a continuous drying device based on the principle of heat conduction. It is primarily used for processing pastes, slurries, or viscous liquids. Its core feature is a rotating heated drum working in conjunction with a scraper system to achieve rapid film formation and efficient dehydration. It is widely used in the food, chemical, and pharmaceutical industries. The drum is a hollow metal cylinder, mostly made of stainless steel. Steam, a heating medium, is passed through its interior, reaching temperatures of 150–250°C. The drum surface is evenly heated, and the heat is transferred through the drum wall to the material outside. The scraper system then removes the dried material from the drum surface, forming a flake, powder, or granular product. The dried material is then collected by a screw conveyor or conveyor belt. Currently, because scraper drum dryers use steam as the heating medium, plants can only be built adjacent to power plants, using the power plant's steam to feed the dryer's drum. This presents certain limitations in plant construction. In addition, existing technologies have been developing methods to replace steam as a heat medium with pure electricity to eliminate reliance on power plants. However, the primary technical problem encountered is that heating the drum to 250°C requires too much electricity, making it uneconomical. Therefore, a technical solution that can heat the drum to 250°C using pure electricity while saving electricity is urgently needed.

[0003] Publication (Announcement) No. CN218973081U discloses a drum scraper dryer comprising a bracket rotatably connected to a first drum, a material trough mounted below the first drum, a drum cover and an exhaust pipe mounted above the first drum, and a second drum mounted within the first drum. The second drum is coaxially arranged with the first drum, with a gap between the first and second drums. The purpose of the drum scraper dryer is to improve heat utilization efficiency during the drying process and avoid uneven heat distribution on both sides of the drum.

[0004] Publication (announcement) number: CN119289628B discloses a roller scraper dryer with an adjustable scraper, which relates to the technical field of drying equipment, including: a frame, which carries the roller scraper dryer, and a driving mechanism is provided inside the frame; a material trough, which is fixed on the frame and located above the driving mechanism; a roller, which is rotatably arranged on the frame, and the bottom of the roller is located in the material trough; a rotating assembly, which is fixed on the frame and fixedly connected to one end of the roller; a rotating ring assembly, which is rotatably arranged on the frames at both ends of the roller and is connected to the driving mechanism; a leveling scraper device and a scraping device, which are arranged on both sides of the roller; the present invention disperses the raw materials on the roller so that the raw materials form a uniformly distributed material layer on the roller, which helps to improve the drying effect of the raw materials, and by adjusting the scraping device, the position between the scraper and the roller is adjusted to control the drying degree and scraping effect of the material.

[0005] Publication (Announcement) No.: CN118142190B discloses a wastewater and waste liquid drum scraper dryer, comprising a shell, a drying cylinder is provided inside the shell, and a scraping mechanism is provided on the front side of the drying cylinder. Through the design of the scraping mechanism, after the mounting plate is installed inside the mounting seat, and the placement blocks on both sides of the first spring are respectively placed inside the first and second clamping seats, the first spring provides elastic force to the two placement blocks, so that the mounting seat is pushed and moves toward the drying cylinder, prompting the scraper to fit the outer surface of the drying cylinder to perform a scraping operation. By releasing the squeezing positioning of the placement blocks by the plug plate, different types of springs can be quickly replaced to adjust the squeezing force of the scraper on the drying cylinder, thereby achieving the purpose of flexible adjustment. Since the mounting plate and the mounting seat are assembled and spliced, they can be flexibly loaded and unloaded by the user, which is conducive to the rapid replacement or maintenance of the scraper.

[0006] Publication (Announcement) No. CN205482195U discloses a drum scraper dryer for solid-liquid separation, comprising: a vacuum device, a rotating drum, a rotating shaft, a power unit, a liquid tray, a scraper, and a residue collection device. The drum and the rotating shaft are coaxial, and the rotating shaft is connected to the power unit. The drum comprises an inner and outer cylinder, which are coaxial. The liquid tray is located below the drum. The drum, liquid tray, and scraper are all located within the vacuum device. The present drum scraper dryer can be used for industrial solid-liquid separation, and is particularly suitable for extracting and collecting volatile substances from systems containing soluble or insoluble inorganic salts. It features low energy loss and short drying times during operation. It also offers uniform heating temperatures, excellent drying results, and consistently high heat and mass transfer efficiencies. It can operate continuously and uninterruptedly, and during this process, the material remains stable without stratification or abrupt changes in the solid-liquid ratio of the feed, making it suitable for large-scale industrial production.

[0007] Publication (Announcement) No.: CN220489564U discloses a rotary drum dryer with an automatic feeding structure, comprising a storage box, a feeding pipe installed below the storage box, and an anti-blocking mechanism installed inside the feeding pipe; a rotating drum is installed below the feeding pipe, and one end of the rotating drum is connected to a connecting shaft, and the input end of the connecting shaft is installed with a driving motor. The utility model sets an anti-blocking mechanism inside the feeding pipe, stirs the wet material in the feeding pipe by a continuously rotating stirring shaft, and continuously scrapes the inner wall of the feeding pipe by using scrapers 1 and 2 that match the feeding pipe, so as to prevent the wet material from sticking to the inner wall of the feeding pipe and causing blockage during discharge. At the same time, since the storage box can be raised and lowered by a lifting cylinder, it can move upward when no material is fed, so that the feeding pipe is away from the discharge port below, reducing the temperature of the feeding pipe, thereby preventing the wet material in the feeding pipe from drying and adhering to the inner wall and being difficult to clean.

[0008] After extensive searching of existing technologies, the inventors have found a technical solution that utilizes pure electric energy to heat the drum to 200° C. while saving electric energy. Summary of the Invention

[0009] The purpose of the present invention is to overcome the deficiencies of the prior art and to provide a hot air type drum scraper dryer, which solves the technical problems in the above-mentioned background technology.

[0010] The purpose of the present invention is achieved as follows: a hot air type drum scraper dryer, comprising a drum, the drum being connected to a hot air blower, the hot air blower being used to provide hot air to the drum, the inner wall of the drum being provided with a graphene coating; the drum being provided with a drum air inlet and a drum air outlet; the hot air blower being provided with a natural air inlet, a circulating air inlet, and a machine air outlet; the machine air outlet being connected to the drum air inlet via a first pipe, and the drum air outlet being connected to the circulating air inlet via a second pipe. By providing a graphene coating on the inner wall of the drum, the graphene coating has a strong thermal conductivity. Under the condition of equal power supply, the inner wall of the drum provided with the graphene coating dissipates heat to the outer wall faster, thereby achieving rapid heating of the outer wall of the drum and saving power. By providing hot air to the drum through a hot air blower, the existing heat medium steam is replaced, and the dependence of the factory building on the vicinity of the power plant is eliminated, and the factory can be built at will. During operation, the hot air blower is powered on, converting electrical energy into heat. This heat is then output through the first pipe and into the drum. The hot air inside the drum transfers heat to the graphene coating on the inner wall of the drum. The graphene coating then transfers the heat to the outer wall of the drum. This rapid heat transfer allows for rapid heating of the drum's outer wall, saving energy. Simultaneously, while transferring heat to the graphene coating, the hot air returns to the hot air blower through the second pipe. It then flows through the drum through the first pipe. This second or subsequent return to the hot air blower requires only a small amount of electricity to reheat to the desired temperature, further saving energy. This circulating hot air and the graphene coating allow the drum's outer wall to be heated quickly and evenly to a temperature of 150–250°C, while conserving energy.

[0011] Furthermore, the hot air blower includes a base, a support foot is fixedly provided at the lower end of the base, a first motor is fixedly provided at the upper end of the base, a hot air chamber is fixedly provided at the left end of the base, an impeller is provided inside the hot air chamber, the impeller is connected to the output shaft of the first motor, an air inlet duct is provided in communication with the left side wall of the hot air chamber, the natural air inlet is provided at the left end of the air inlet duct, the circulating air inlet is provided at the side wall of the air inlet duct, an air inlet control valve is provided on the body of the air inlet duct, the air outlet is provided at the side wall of the hot air chamber, and a docking flange is provided at the air outlet. When in use, after the hot air blower is powered on, the first motor drives the impeller to rotate, and after the impeller rotates, negative pressure is formed inside the hot air chamber. Under the action of the negative pressure, air is sucked into the hot air chamber through the natural air inlet, and inside the hot air chamber, the impeller rubs the air to heat the air, and the heated air forms hot air, which is output to the first duct through the air outlet and then flows into the drum. Only when the hot air blower is started for the first time, the air source comes entirely from the natural air inlet, and the impeller rubs the air to form hot air slowly, consuming more power. When the hot air is recycled back to the hot air chamber for the second or more times, the air source of the hot air chamber comes from the natural air inlet and the circulating air inlet. At this time, the incoming air is already hot air, and the hot air can be heated to the specified temperature again with less power consumption. Similarly, as the number of hot air cycles gradually increases and time accumulates, the hot air entering the hot air chamber becomes hotter and hotter, and less and less electricity is required to make the hot air reach the specified temperature. In other words, as time goes by, the more you use it, the more electricity you save.

[0012] Furthermore, the impeller includes a left disc and a right disc, which are fixedly connected by a connecting shaft in the middle. A hot air cavity is formed between the left and right discs. A plurality of friction arc plates are fixedly disposed within the hot air cavity. The left disc is disposed corresponding to the air inlet pipe, and a pin is fixedly connected to the right side wall of the right disc. The pin is fixedly connected to the output shaft of the first motor. The disc surface of the left disc has a plurality of air inlet holes. During use, the first motor drives the pin to rotate, which in turn drives the impeller to rotate. After the impeller rotates, the friction arc plates rub against the air inside the hot air chamber, converting the air into hot air.

[0013] Furthermore, a plurality of rectangular protrusions are provided on the left disk surface of the left disk body at a position corresponding to the inner opening of the air inlet pipe. The rectangular protrusions are provided with a plurality of friction cut surfaces. The friction cut surfaces are used to guide the wind direction when the air is blown in by the air inlet pipe, and to divert the wind to the air inlet hole. The friction cut surfaces are used to increase the friction contact surface between the wind and the left disk body when the air is blown in by the air inlet pipe. The inner concave surface of the friction arc plate is provided with a plurality of spherical protrusions. The spherical protrusions are used to increase the contact area between the wind flowing into the hot air cavity after passing through the air inlet hole and the friction arc plate. By providing the friction cut surfaces, when the wind passes through the left disk body, the friction cut surfaces rub against the air, and the increased contact area is utilized to accelerate the heating speed, so that the air quickly forms hot air. By providing the spherical protrusions, after the initially heated air forms hot air, the heating of the air is accelerated again under the action of the plurality of spherical protrusions.

[0014] Furthermore, the drum is rotatably arranged above a frame, the frame including a bottom plate, the bottom plate being fixedly provided with a second motor, the second motor being connected to the drum via a transmission assembly, the second motor being used to drive the drum to rotate above the frame via the transmission assembly; a material pool is provided below the drum, the material pool being used to hold the material to be dried, and a scraper corresponding to the outer wall of the drum is provided on the outside of the material pool. The transmission assembly includes a first pulley fixedly provided on the output shaft of the second motor, the left end of the drum being fixedly connected to a transmission shaft, the transmission shaft being fixedly provided with a second pulley, the second pulley being connected to the first pulley via a belt. During use, the material to be dried is placed into the material pool, the second motor drives the heated drum to rotate, the outer wall of the drum contacts the slurry in the material pool during rotation, the slurry adheres to the outer wall of the drum, the water in the slurry is evaporated, and the dried slurry is then peeled off from the surface of the drum by the scraper of the scraper system, forming a flake, powder or granular product, and the dried slurry is collected by a screw conveyor or a conveyor belt. The power of the hot air blower is preferably 110kw or 45kw models, and models of other powers can also be used. When a 110kw hot air blower is used, the power consumption per hour is about 77 kWh, which saves electricity.

[0015] The beneficial effects of the present invention are as follows: by providing a graphene coating on the inner wall of the drum, the graphene coating has a strong thermal conductivity. Under the condition of the same power supply, the heat dissipation speed from the inner wall of the drum provided with the graphene coating to the outer wall is faster, so that the outer wall of the drum can be heated up quickly and energy can be saved. The hot air is supplied to the drum by a hot air blower, replacing the existing heat medium steam, getting rid of the dependence of the factory building near the power plant, and the factory can be built at will. When in use, the hot air blower is powered on, and the electrical energy is converted into thermal energy after passing through the hot air blower. The hot air blower outputs hot air into the drum through the first pipe. The hot air inside the drum first transfers the heat to the graphene coating on the inner wall of the drum, and the graphene coating then transfers the heat to the outer wall of the drum. The heat transfer speed is fast, and the outer wall of the drum can be heated quickly, which saves energy. At the same time, the hot air from the inner wall of the drum transfers heat to the graphene coating. It then returns to the hot air blower through the second pipe, then flows through the first pipe through the drum. This second or multiple return to the hot air blower requires only a small amount of electricity to be heated to the desired temperature, further saving energy. Thanks to the circulating hot air and the graphene coating, the outer wall of the drum can be quickly and evenly heated to 150–250°C while saving energy.

[0016] The existing technology uses steam as the heat medium, which costs 180 yuan per cubic meter. Drying one ton of slurry costs 220 yuan. The present invention uses pure electricity and hot air as the heat medium, which costs 0.6 yuan per kilowatt-hour. Drying one ton of slurry costs only 120 yuan. In addition, the heat medium gets hotter as it is used, requiring less electricity for heating, thus saving more money.

[0017] The invention makes efficient use of electric energy, which is converted into kinetic energy through the motor. The kinetic energy is rubbed against the air by the high-speed rotation of the impeller to produce high-temperature hot air, which is transferred to the graphene coating inside the drum. The high thermal conductivity of graphene is used to quickly transfer heat to the outer surface of the drum to heat the material on the outer surface of the drum for drying. It saves 50% energy compared to traditional drum dryers that use electric furnace wire, electric heating rods, steam, and thermal oil boilers. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a structural schematic diagram of the present invention; Figure 2 It is a schematic structural diagram of the hot air blower of the present invention; Figure 3 This is a schematic diagram of the main structure of the impeller of the present invention; Figure 4 This is a left-side structural schematic diagram of the impeller of the present invention; Figure 5 It is a schematic diagram of the three-dimensional structure of the impeller of the present invention; Figure 6 The present invention Figure 5 Middle A enlarged view; Figure 7 It is a schematic diagram of the drum structure of the present invention; Figure 8 The present invention Figure 7 Middle B is an enlarged view.

[0019] In the figure: 1 drum, 2 hot air blower, 3 graphene coating, 4 drum air inlet, 5 drum air outlet, 6 natural air inlet, 7 circulating air inlet, 8 machine air outlet, 9 first pipe, 10 second pipe, 11 machine base, 12 support leg, 13 first motor, 14 hot air chamber, 15 impeller, 16 air inlet pipe, 17 air inlet control valve, 18 docking flange, 19 left disk, 20 right disk, 21 friction arc plate, 22 pin, 23 air inlet hole, 24 rectangular convex, 25 friction section, 26 spherical convex, 27 bottom plate, 28 second motor, 29 material tank, 30 first pulley, 31 second pulley, 32 belt. DETAILED DESCRIPTION

[0020] The present invention will be further described in detail below with reference to the accompanying drawings. It should be noted that all directional words such as up, down, front, back, left, and right that appear in the present invention are based on Figure 1 The figures are made for reference only, and all directional words do not limit the present invention, but are only used to more clearly illustrate and explain the present invention. Example

[0021] like Figure 1-8 As shown, this embodiment discloses a hot air type drum scraper dryer, comprising a drum 1, the drum 1 being connected to a hot air blower 2 for providing hot air to the drum 1, the inner wall of the drum 1 being provided with a graphene coating 3; the drum 1 being provided with a drum air inlet 4 and a drum air outlet 5; the hot air blower 2 being provided with a natural air inlet 6, a circulating air inlet 7, and a machine air outlet 8; the machine air outlet 8 being connected to the drum air inlet 4 via a first pipe 9, and the drum air outlet 5 being connected to the circulating air inlet 7 via a second pipe 10. By providing a graphene coating 3 on the inner wall of the drum 1, the graphene coating 3 has a strong thermal conductivity. Under the condition of equal power supply, the drum 1 provided with the graphene coating 3 dissipates heat faster from the inner wall to the outer wall, achieving rapid heating of the outer wall of the drum 1 and saving electricity. By providing hot air to the drum 1 by the hot air blower 2, the existing heat medium steam is replaced, eliminating the dependence on the construction of the factory building near the power plant, and allowing the factory to be built at will.

[0022] During operation, the hot air blower 2 is powered on. The electrical energy is converted into heat after passing through the hot air blower 2. The hot air from the hot air blower 2 is then output through the first conduit 9 and into the drum 1. The hot air inside the drum 1 transfers heat to the graphene coating 3 on the inner wall of the drum 1. The graphene coating 3 then transfers the heat to the outer wall of the drum 1. This rapid heat transfer speed allows the outer wall of the drum 1 to be heated quickly, saving energy. Simultaneously, while the hot air on the inner wall of the drum 1 transfers heat to the graphene coating 3, it returns to the hot air blower 2 through the second conduit 10. It then flows through the drum 1 through the first conduit 9 for a second or multiple times. This hot air returns to the hot air blower 2 again, requiring only a small amount of electricity to be heated to the desired temperature, further saving energy. Thanks to the circulating hot air and the graphene coating 3, the outer wall of the drum 1 can be quickly heated to a temperature of 150–250°C while saving energy, and the outer wall of the drum 1 is heated evenly. The existing technology uses steam as the heat medium, which costs 180 yuan per cubic meter. Drying one ton of slurry costs 220 yuan. The present invention uses pure electricity and hot air as the heat medium, which costs 0.6 yuan per kilowatt-hour. Drying one ton of slurry costs only 120 yuan. In addition, the heat medium gets hotter as it is used, requiring less electricity for heating, thus saving more money. Example

[0023] like Figure 1-8As shown, this embodiment discloses a hot air type drum scraper dryer, comprising a drum 1, the drum 1 being connected to a hot air blower 2, the hot air blower 2 being used to provide hot air to the drum 1, the hot air blower 2 being connected to a power supply, the power supply providing electrical energy to the hot air blower 2, the inner wall of the drum 1 being provided with a graphene coating 3; the drum 1 being provided with a drum air inlet 4 and a drum air outlet 5; the hot air blower 2 being provided with a natural air inlet 6, a circulating air inlet 7, and a machine air outlet 8; the machine air outlet 8 being connected to the drum air inlet 4 via a first pipe 9, and the drum air outlet 5 being connected to the circulating air inlet 7 via a second pipe 10. By providing the graphene coating 3 on the inner wall of the drum 1, the graphene coating 3 has strong thermal conductivity. Under the condition of equal power supply, the inner wall of the drum 1 provided with the graphene coating 3 dissipates heat to the outer wall faster, thereby achieving rapid heating of the outer wall of the drum 1 and saving power. Hot air is supplied to the drum 1 by the hot air blower 2, replacing the existing heat medium steam, getting rid of the dependence of the construction of the factory building near the power plant, and the factory can be built at will. When in use, the hot air blower 2 is powered on, and the electrical energy is converted into thermal energy after passing through the hot air blower 2. The hot air blower 2 outputs hot air into the drum 1 through the first pipe 9. The hot air inside the drum 1 first transfers the heat to the graphene coating 3 on the inner wall of the drum 1, and the graphene coating 3 then transfers the heat to the outer wall of the drum 1. The heat transfer speed is fast, which can achieve rapid heating of the outer wall of the drum 1, fast heating speed, and save electricity. At the same time, while the hot air on the inner wall of the drum 1 transfers the heat to the graphene coating 3, the hot air returns to the inside of the hot air blower 2 again through the second pipe 10, and then flows through the inside of the drum 1 through the first pipe 9. The hot air that returns to the inside of the hot air blower 2 for the second time or multiple times only requires a small amount of electricity to be heated to the specified temperature again, saving electricity again. Under the action of the circulating hot air and the graphene coating 3, the outer wall of the drum 1 can be quickly heated to 150-250°C while saving electricity, and the outer wall of the drum 1 is heated evenly.

[0024] For better effect, the hot air blower 2 includes a base 11, a support leg 12 is fixedly provided at the lower end of the base 11, a first motor 13 is fixedly provided at the upper end of the base 11, a hot air chamber 14 is fixedly provided at the left end of the base 11, an impeller 15 is provided inside the hot air chamber 14, and the impeller 15 is connected to the output shaft of the first motor 13, and the left side wall of the hot air chamber 14 is connected to the air inlet pipe 16, the natural air inlet 6 is provided at the left end of the air inlet pipe 16, the circulating air inlet 7 is provided on the side wall of the air inlet pipe 16, the pipe body of the air inlet pipe 16 is provided with an air inlet control valve 17, the air outlet 8 is provided on the side wall of the hot air chamber 14, and the air outlet 8 is provided with a docking flange 18. During operation, after the hot air blower 2 is powered on, the first motor 13 drives the impeller 15 to rotate. The rotation of the impeller 15 creates a negative pressure inside the hot air chamber 14. Under the action of this negative pressure, air is drawn into the hot air chamber 14 through the natural air inlet 6. Inside the hot air chamber 14, the impeller 15 rubs against the air, heating it. The heated air forms hot air, which is then output through the air outlet 8 to the first duct 9 and then flows into the drum 1. Only when the hot air blower 2 is first started up does the air source come entirely from the natural air inlet 6, and the impeller 15 rubs against the air to form hot air more slowly, resulting in higher power consumption. When the hot air is recycled back to the hot air chamber 14 for the second or multiple times, the air source of the hot air chamber 14 comes from the natural air inlet 6 and the circulating air inlet 7. At this time, the incoming air is already hot air, and the hot air can be heated up to the specified temperature again under the condition of low power consumption. Similarly, as the number of hot air circulations gradually increases and time accumulates, the hot air entering the hot air chamber 14 becomes hotter and hotter, and less and less electric energy is required to make the hot air reach the specified temperature, that is, as time goes by, the more electricity is saved.

[0025] To achieve better results, the impeller 15 includes a left disc 19 and a right disc 20. The left and right discs 19 and 20 are fixedly connected by a connecting shaft, forming a hot air cavity between the left and right discs 19 and 20. Multiple friction arc blades 21 are fixedly disposed within the hot air cavity. The left disc 19 is positioned corresponding to the air inlet pipe 16. A pin 22 is fixedly connected to the right side wall of the right disc 20. This pin 22 is fixedly connected to the output shaft of the first motor 13. Multiple air inlet holes 23 are formed on the surface of the left disc 19. During operation, the first motor 13 drives the pin 22 to rotate, which in turn drives the impeller 15. As the impeller 15 rotates, the friction arc blades 21 rub against the air inside the hot air chamber 14, converting the air into hot air.

[0026] For better performance, the left disc 19 has several rectangular protrusions 24 positioned on its left surface, corresponding to the inner opening of the air inlet duct 16. These protrusions are equipped with multiple friction surfaces 25. These surfaces guide the incoming air from the air inlet duct 16, directing it toward the air inlet opening 23. These surfaces also increase the frictional contact surface between the air and the left disc 19. The concave inner surface of the friction arc plate 21 is equipped with several spherical protrusions 26, which increase the contact area between the air flowing into the hot air cavity after passing through the air inlet opening 23 and the friction arc plate 21. The friction surfaces 25 rub against the air as it passes through the left disc 19, increasing the contact area and accelerating the heating process, allowing the air to quickly form hot air. The spherical protrusions 26 further accelerate the heating of the initially heated air after it forms hot air.

[0027] For better results, the drum 1 is rotatably mounted above a frame. The frame includes a base plate 27, to which a second motor 28 is fixedly mounted. The second motor 28 is connected to the drum 1 via a transmission assembly, and is used to drive the drum 1 to rotate above the frame via the transmission assembly. A material pool 29 is provided below the drum 1 for holding the material to be dried. A scraper is provided on the outside of the material pool 29 to correspond to the outer wall of the drum 1. The transmission assembly includes a first pulley 30 fixed to the output shaft of the second motor 28. The left end of the drum 1 is fixedly connected to a transmission shaft, which is fixedly mounted with a second pulley 31. The second pulley 31 is connected to the first pulley 30 via a belt 32. During use, the material to be dried is placed in the material pool 29, and the second motor 28 drives the heated drum 1 to rotate. The outer wall of the drum 1 contacts the slurry in the material pool 29 during the rotation. The slurry sticks to the outer wall of the drum 1, and the water in the slurry is evaporated. The dried slurry is then peeled off from the surface of the drum 1 by the scraper of the scraper system to form a flake, powder or granular product. The dried slurry is collected by a screw conveyor or a conveyor belt.

[0028] The above are only preferred specific embodiments of the present invention, but the scope of protection of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes based on the technical solutions and concepts of the present invention within the technical scope disclosed by the present invention, and they should be covered by the scope of protection of the present invention.

Claims

1. A hot air type drum scraper dryer, comprising a drum, characterized in that: The drum is connected to a hot air blower, which is used to provide hot air for the drum and is connected to a power source.

2. The hot air type drum scraper dryer according to claim 1, characterized in that: The drum is provided with a drum air inlet and a drum air outlet, and the inner wall of the drum is provided with a graphene coating; the hot air blower is provided with a natural air inlet, a circulating air inlet and a machine air outlet; the machine air outlet is connected to the drum air inlet through a first pipe, and the drum air outlet is connected to the circulating air inlet through a second pipe.

3. The hot air type drum scraper dryer according to claim 2, characterized in that: The hot air blower includes a base, a support leg is fixedly provided at the lower end of the base, a first motor is fixedly provided at the upper end of the base, a hot air chamber is fixedly provided at the left end of the base, an impeller is provided inside the hot air chamber, the impeller is connected to the output shaft of the first motor, an air inlet pipe is connected to the left side wall of the hot air chamber, the natural air inlet is provided at the left end of the air inlet pipe, the circulating air inlet is provided at the side wall of the air inlet pipe, the pipe body of the air inlet pipe is provided with an air inlet control valve, the air outlet is provided on the side wall of the hot air chamber, and the air outlet is provided with a docking flange.

4. The hot air type drum scraper dryer according to claim 3, characterized in that: The impeller includes a left disc body and a right disc body, and the middle of the left disc body and the right disc body are fixedly connected by a connecting shaft. A hot air cavity is formed between the left disc body and the right disc body, and a plurality of friction arc-shaped sheets are fixedly arranged inside the hot air cavity. The left disc body is arranged corresponding to the air inlet pipe, and the right side wall of the right disc body is fixedly connected to a pin shaft, and the pin shaft is fixedly connected to the output shaft of the first motor; the disc surface of the left disc body is provided with a plurality of air inlet holes.

5. The hot air type drum scraper dryer according to claim 4, characterized in that: A plurality of rectangular protrusions are provided at a position on the left disk surface of the left disk body corresponding to the inner opening of the air inlet pipe, and the rectangular protrusions are provided with a plurality of friction cut surfaces. The friction cut surfaces are used to guide the wind direction when the air is blown in by the air inlet pipe, and to guide the wind to the air inlet hole, and the friction cut surfaces are used to increase the friction contact surface between the wind and the left disk body when the air is blown in by the air inlet pipe; the inner concave surface of the friction arc plate is provided with a plurality of spherical protrusions, and the spherical protrusions are used to increase the contact area between the wind flowing into the hot air cavity after passing through the air inlet hole and the friction arc plate.

6. The hot air type drum scraper dryer according to claim 2, characterized in that: The roller is rotatably arranged above the frame, and the frame includes a bottom plate. The bottom plate is fixedly provided with a second motor, and the second motor is connected to the roller through a transmission assembly. The second motor is used to drive the roller to rotate above the frame through the transmission assembly; a material pool is provided below the roller, and the material pool is used to hold the material to be dried. A scraper corresponding to the outer wall of the roller is provided on the outside of the material pool.

7. The hot air type drum scraper dryer according to claim 6, characterized in that: The transmission assembly includes a first pulley fixedly arranged on the output shaft of the second motor, the left end of the drum is fixedly connected to the transmission shaft, the transmission shaft is fixedly provided with a second pulley, and the second pulley is connected to the first pulley through a belt.

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