Wireless heating spiral dryer

Abstract

The utility model discloses a radio heating spiral dryer. The spiral blade comprises a shell and a shaft rod, the shaft rod penetrates through the shell and can rotate, and a plurality of spiral blades are fixed to the shaft rod. One end of the shaft rod is driven by the driving mechanism, and the other end of the shaft rod is sleeved with a power receiving coil cylinder, wound with a receiving coil and electrically connected with the second driving circuit board. The transmitting coil cylinder rotatably sleeves the power receiving coil cylinder, internally winds the transmitting coil and is electrically connected with the first driving circuit board, and the transmitting coil cylinder and the first driving circuit board are not in contact. The first driving circuit board is connected with a power source, and the second driving circuit board is connected with a relay switch group in the shell through a cable in the shaft rod. And an electrothermal film is arranged on the spiral blade, is connected with the relay switch group, controls the blade temperature and is connected with the driving circuit board II in parallel. The device does not need a hot blast stove and air transmission equipment, can save construction cost, energy and water resources, reduces dust generation, rapidly starts and stops heating and drying, and improves dehumidifying and drying efficiency.

Description

Technical Field

[0001] The utility model relates to the field of chemical equipment, and relates to a spiral dryer with radio heating. Background Art

[0002] A spiral dryer, as the name implies, is a device that uses spiral motion for drying. It mainly consists of a feeding device, a spiral stirring system, a hot blast stove, a discharging device, a dust removal device, etc. The working principle of the spiral dryer is to utilize the heat transfer and mass transfer between hot air and materials to convey wet materials into the interior of the dryer through a spiral auger. After being heated by hot air, the moisture is discharged, thereby realizing the drying of the materials.

[0003] The feeding device feeds wet materials into the spiral dryer. These wet materials can be granular, powdery or slurry-like, such as ores, powders, sludges, etc. The feeding devices of spiral dryers usually have various forms, such as spiral feeding, pneumatic conveying devices, etc. These devices can be selected according to the properties of the materials and process requirements.

[0004] Next, the spiral stirring system starts to work. The spiral stirring system is the core component of the spiral dryer, and it consists of spiral blades, a main shaft, a transmission device, etc. The number and shape of the spiral blades can be designed according to the properties of the materials and drying requirements. When the spiral dryer starts to operate, the spiral blades will push the wet materials from the feeding port into the interior of the dryer, forming a material layer. At the same time, the transmission device of the spiral dryer will drive the spiral blades to rotate, causing the materials and hot air to continuously tumble and transfer heat inside the dryer.

[0005] Inside the material layer, the hot air generated by the hot blast stove is introduced into the spiral dryer. The hot blast stove usually uses coal, gas or electric heating, etc. to generate and heat the hot air to a certain temperature. The hot air enters the drying chamber of the spiral dryer through a hot air pipeline. Inside the drying chamber, the hot air conducts heat, radiates heat and convects heat with the materials, enabling the moisture of the materials to evaporate, thereby achieving the purpose of drying. Finally, after passing through the dust removal device, the dust is returned to the hot blast stove or discharged into the atmosphere. When the local temperature is too high during the drying process of the spiral dryer, such as when drying plastic particles, problems such as melting and caking may occur, and when drying crystals, problems such as crystal melting may occur. Summary of the Utility Model

[0006] The technical problem solved by the utility model is that, without changing the original spiral dryer, by installing a radio heating device to dry the materials, the hot blast stove and gas transmission equipment can be omitted, the generation of dust can be reduced, the consumption of energy and water can be reduced, the equipment structure can be simplified, and the immediate start and stop of drying temperature rise can be achieved.

[0007] The technical solution adopted by the utility model is a spiral dryer with radio heating, which includes a housing and a shaft rod. The housing has a columnar cavity. The shaft rod passes through the front and rear ends of the housing and can rotate. A plurality of mutually parallel spiral blades are fixedly connected along the length direction on the shaft rod in the housing. One end of the shaft rod is driven to rotate by a driving mechanism, and a power receiving coil cylinder is sleeved outside the other end. A receiving coil is wound outside the power receiving coil cylinder, and the receiving coil is electrically connected to a driving circuit board two in the power receiving coil cylinder; A transmitting coil cylinder is rotatably sleeved on the power receiving coil cylinder. A transmitting coil is wound in the transmitting coil cylinder, and the transmitting coil is electrically connected to a driving circuit board one in the transmitting coil cylinder. The transmitting coil and the receiving coil do not contact each other; The driving circuit board one is electrically connected to a cable one of the power supply, and the driving circuit board two is electrically connected to a relay switch group in the housing through a cable two in the shaft rod;

[0008] An electric heating film is provided on the spiral blade. The electric heating film is electrically connected to the relay switch group to control the temperature of the spiral blade, and is connected in parallel with the driving circuit board two through the relay switch group.

[0009] Further, the electric heating film is set to have a certain width and a plurality of winding structures that are not connected end to end. Pins are provided at the head and tail of each electric heating film, and the pins are electrically connected to the relay switch group.

[0010] Further, the relay switch group includes a plurality of temperature relays. The number of temperature relays is equal to the number of electric heating films. Each electric heating film is connected in series with a temperature relay to form an electric heating circuit, and each heating circuit is connected in parallel with the driving circuit board two. The temperature relay is closely attached to the spiral blade where the electric heating film it is connected to is located.

[0011] Further, an inner encapsulation layer and an outer encapsulation layer are also provided on the surface of the spiral blade. The inner encapsulation layer, the electric heating film, and the outer encapsulation layer are sequentially covered on the spiral blade from the inside to the outside. The inner encapsulation layer and the outer encapsulation layer are made of PI film or PET film.

[0012] Further, the driving circuit board one converts external direct current into alternating current and transmits the alternating current to the transmitting coil cylinder; The driving circuit board two rectifies, filters, and stabilizes the alternating current converted from the received electromagnetic energy, and leads out the stable direct current through the cable two.

[0013] Further, the power receiving coil cylinder is rotationally connected to the transmitting coil cylinder through a bearing.

[0014] Further, the feed inlet of the housing is connected to a feeding device, the discharge outlet of the housing is connected to a hopper, and a ventilation port is also provided on the housing. The ventilation port is connected to an exhaust fan through a pipeline for discharging water vapor.

[0015] Compared with the prior art, the utility model has the following beneficial effects:

[0016] 1. Compared with the traditional spiral dryer, there is no longer a need for a hot blast stove device and air transmission equipment, saving construction costs and consumption of energy and water.

[0017] 2. Without using air supply facilities, the generation of dust is reduced.

[0018] 3. Using radio heating for drying, the heating can be started and stopped more quickly.

[0019] 4. Installing radio heating equipment on the traditional spiral dryer enables the utilization of traditional equipment and reduces application costs.

[0020] 5. Through the parallel connection of temperature relays and electric heating films, different parts of the spiral dryer can dry wet materials at different temperatures, accelerating the drying speed and avoiding the deterioration of wet materials caused by too high drying temperature. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a schematic diagram of part of the internal structure of the present utility model;

[0022] Figure 2 It is a schematic diagram of the external structure of the present utility model;

[0023] Figure 3 It is a schematic circuit diagram of the electric heating film of the present utility model. Among them, 1 is the shaft rod; 2 is the spiral blade; 3 is the power receiving coil cylinder, 4 is the transmitting coil cylinder, 5 is the bearing, 6 is the first cable, 7 is the second cable, 8 is the first drive circuit board, 9 is the transmitting coil, 10 is the receiving coil, 11 is the second drive circuit board, 12a is the inner encapsulation layer, 12b is the outer encapsulation layer, 13 is the electric heating film, 14 is the relay switch group, 16 is the housing, 17 is the drive mechanism, 18 is the feed inlet, 19 is the feeding device, 20 is the discharge outlet, 21 is the hopper, 22 is the ventilation opening. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0024] The following further describes the present utility model in detail with reference to embodiments, but the protection scope of the present utility model is not limited thereto.

[0025] Embodiment 1

[0026] As an example, such as Figure 1As shown in the figure, a screw dryer with radio heating includes: a housing 16 and a shaft 1. The housing 16 has a columnar cavity for accommodating materials. The shaft 1 passes through the front and rear ends of the housing 16 and is rotatable. A plurality of mutually parallel screw blades 2 are fixedly connected along the length direction on the shaft 1 in the housing 16. One end of the shaft 1 is driven to rotate by a driving mechanism 17. A current receiving coil cylinder 3 is sleeved on the other end of the shaft 1. An emitting coil cylinder 4 is sleeved outside the current receiving coil cylinder 3. An emitting coil 9 is wound in the emitting coil cylinder 4. A receiving coil 10 is wound outside the current receiving coil cylinder 3. The emitting coil 9 is electrically connected to a driving circuit board one 8 in the emitting coil cylinder 4. The driving circuit board one 8 is electrically connected to a cable one 6 from a power source. The receiving coil 10 is electrically connected to a driving circuit board two 11 in the current receiving coil cylinder 3. The driving circuit board two 11 is electrically connected to a relay switch group 14 in the housing 16 through a multi-strand cable two 7 in the shaft 1. The emitting coil 9 and the receiving coil 10 do not contact each other. The emitting coil 9 is used to transmit electrical energy to the receiving coil 10 in the form of radio waves. The driving circuit board one 8 is used to convert external direct current into alternating current and transmit the alternating current to the emitting coil cylinder 4. The driving circuit board two 11 is used to rectify, filter, and regulate the alternating current corresponding to the received electromagnetic energy and convert it, and lead out the stable direct current through the cable two 7. The current receiving coil cylinder 3 and the emitting coil cylinder 4 are rotatably connected by a bearing 5. The cable two 7 is arranged in the shaft 1.

[0027] An inner encapsulation layer 12a, a heating film 13, and an outer encapsulation layer 12b are sequentially covered on the surface of each screw blade from the inside to the outside. The heating film 13 is set to have a certain width and a plurality of non-connected line segments with a meandering structure. Each end of each heating film 13 is provided with a pin. The pins of one heating film 13 in each annular region are respectively electrically connected to the relay switch group 14. The inner encapsulation layer 12a and the outer encapsulation layer 12b encapsulate the heating film 13 therebetween. The inner encapsulation layer 12a and the outer encapsulation layer 12b are made of PI film or PET film, preferably PI film. Because PI film (polyimide film) has excellent high and low temperature resistance, electrical insulation, adhesion, radiation resistance, and medium resistance, it can be used for a long time in the temperature range of -269°C to 280°C, and can reach a short-term high temperature of 400°C. The heating film is a known technology. The electrothermal coating is a semi-conductive coating film that chemically reacts into a mass at room temperature, that is, the electrothermal film. Electrodes are provided at both ends of the coating film and electricity is passed through to generate heat. The heating temperature (surface temperature) can range from 20 to 2500°C. The electrothermal coating used here is prepared by the preparation method disclosed in the patent "An Electrothermal Coating and Its Preparation Method" with the application number 201910250718.9, specifically prepared by mixing 0.1 - 15 parts of graphene, 40 - 60 parts of metal oxide, 5 - 20 parts of non-metal oxide, 5 - 20 parts of organic semiconductor material, and 5 - 20 parts of polymer.

[0028] The relay switch group 14 includes a plurality of temperature relays. The number of temperature relays is equal to the number of electrothermal films 13. Each electrothermal film 13 is connected in series with a temperature relay to form an electrothermal circuit. Each heating circuit is connected in parallel to the driving circuit board two 11 through the cable two 7. The temperature relay is closely attached to the spiral blade where the electrothermal film 13 it is connected to is located.

[0029] The feed inlet 18 of the housing 16 is communicated with the feeding device 19. The discharge outlet 20 of the housing 16 is communicated with the hopper 21. The housing 16 is also provided with a ventilation port 22, and the ventilation port 22 is communicated with the exhaust fan through a pipeline for discharging water vapor.

[0030] It can be understood that the present utility model uses a fixed transmitting coil cylinder 4 to transmit electric energy to the rotating receiving coil cylinder 3 for heating the spiral blade 2 on the rotating shaft rod 1. The wet material is dried by contacting the spiral blade 2.

[0031] In addition, it can also be understood that when the wet material is dried in the spiral dryer disclosed in the present utility model, the material is stirred by the spiral blade 2 in the housing 16 and advances along the shaft rod 1 towards the discharge outlet 20. At the same time, the material is tumbled by the spiral blade 2 and contacts the outer encapsulation layer 12b heated by the electrothermal film 13. After the material is heated, the moisture evaporates and is extracted by the exhaust fan. The remaining dry material is discharged from the discharge outlet after drying. Since the moisture in the moisture-containing material needs to absorb heat during evaporation, the surface temperature of the spiral blade in contact with the material will decrease. The temperature relay at this spiral blade remains closed, and the electrothermal film is normally heated. While the temperature of the spiral blade in contact with the completely dried material is high. When the temperature of this spiral blade is higher than the critical temperature, the temperature relay can be disconnected to cut off the power supply of the electrothermal film 13 of this spiral blade. This spiral blade starts to cool down. When the temperature drops to a certain value, the temperature relay can automatically close and reconnect the power supply, and the electrothermal film 13 conducts normal heating to limit the temperature of this spiral blade within a safe range to prevent the material from coking or melting due to the too high surface temperature of this spiral blade.

[0032] In addition, since the wet material has a high water content when it first enters the housing 16, the critical temperature of the temperature relay on the spiral blade near the feed inlet can be set higher. When the wet material is about to leave the housing 16, it is completely dried. Therefore, the critical temperature of the temperature relay on the spiral blade near the discharge outlet can also be set lower. In this way, each spiral blade on the shaft rod can dry the wet material at different temperatures, enabling the wet material to be dried faster without overheating.

Claims

1. A radio-heated spiral dryer, comprising a housing (16) and a shaft (1), characterized in that, The housing (16) has a columnar cavity. The shaft rod (1) passes through the front and rear ends of the housing (16) and is rotatable. A plurality of mutually parallel helical blades (2) are fixedly connected along the length direction on the shaft rod (1) inside the housing (16). One end of the shaft rod (1) is driven to rotate by a driving mechanism (17), and a power receiving coil cylinder (3) is sleeved outside the other end. A receiving coil (10) is wound around the power receiving coil cylinder (3), and the receiving coil (10) is electrically connected to a driving circuit board two (11) in the power receiving coil cylinder (3); The transmitting coil cylinder (4) is rotatably sleeved on the power receiving coil cylinder (3). A transmitting coil (9) is wound inside the transmitting coil cylinder (4), and the transmitting coil (9) is electrically connected to a driving circuit board one (8) in the transmitting coil cylinder (4). The transmitting coil (9) and the receiving coil (10) do not contact each other; The driving circuit board one (8) is electrically connected to a cable one (6) of the power supply, and the driving circuit board two (11) is electrically connected to a relay switch group (14) inside the housing (16) through a cable two (7) inside the shaft rod (1); An electrothermal film (13) is provided on the helical blade (2), and the electrothermal film (13) is electrically connected to the relay switch group (14) to control the temperature of the helical blade (2). The electrothermal film (13) is connected in parallel with the driving circuit board two (11) through the relay switch group (14).

2. The radio-heated spiral dryer according to claim 1, wherein The electrothermal film (13) is set to have a certain width and a plurality of non-connected line segments with a meandering structure. Pins are arranged at the head and tail of each electrothermal film (13), and the pins are electrically connected to the relay switch group (14).

3. The radio-heated spiral dryer according to claim 1, characterized in that, The relay switch group (14) includes a plurality of temperature relays. The number of temperature relays is equal to the number of electrothermal films (13). Each electrothermal film (13) and a temperature relay are connected in series to form an electrothermal circuit. Each heating circuit is connected in parallel with the driving circuit board two (11). The temperature relay is closely attached to the helical blade (2) where the electrothermal film (13) it is connected to is located.

4. The radio-heated spiral dryer according to claim 1, wherein, An inner encapsulation layer (12a) and an outer encapsulation layer (12b) are also provided on the surface of the helical blade (2). The inner encapsulation layer (12a), the electrothermal film (13), and the outer encapsulation layer (12b) cover the helical blade (2) in sequence from the inside to the outside. The inner encapsulation layer (12a) and the outer encapsulation layer (12b) are made of PI film or PET film.

5. The radio-heated spiral dryer according to claim 1, characterized in that, The driving circuit board one (8) converts external direct current into alternating current and transmits the alternating current to the transmitting coil cylinder (4); The driving circuit board two (11) rectifies, filters, and stabilizes the alternating current converted from the received electromagnetic energy, and leads out the stable direct current through the cable two (7).

6. The radio-heated spiral dryer according to claim 1, characterized in that, The power receiving coil cylinder (3) is rotationally connected to the transmitting coil cylinder (4) through a bearing.

7. The radio-heated spiral dryer according to claim 1, characterized in that, The feed inlet (18) of the housing (16) is connected to a feeding device (19), the discharge outlet (20) of the housing (16) is connected to a hopper (21), and a ventilation port (22) is also provided on the housing (16). The ventilation port (22) is connected to an exhaust fan through a pipeline for discharging water vapor.

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