A new type of grain microwave hot air drying equipment

Abstract

The application discloses a novel grain microwave hot air drying equipment and relates to the technical field of grain drying. The equipment comprises a hot air device, a drying device and a lifting device. The drying device comprises a drying cavity and a resonance cavity. A stirring mechanism for stirring materials is arranged in the drying cavity. A microwave generating mechanism is arranged on the outer side of the resonance cavity. The hot air device is used for blowing hot air into the drying cavity. The lifting device is connected with the drying cavity through a circulating feeding pipe at the top and connected with the drying cavity through a circulating hopper at the bottom. The hot air device, the drying device and the lifting device are sequentially arranged. The stirring mechanism is arranged in the drying cavity, and the microwave generating mechanism is arranged in the resonance cavity. The materials in the drying cavity are subjected to microwave heating drying and hot air drying at the same time. The stirring mechanism stirs the materials during the drying process, so that the uniformity of the hot air drying and the microwave drying and the drying efficiency are improved.

Description

Technical Field

[0001] The present invention relates to the technical field of grain drying, in particular to a novel microwave hot air drying device for grain. Background Art

[0002] The moisture content of grain after harvest is about 25% to 30%. If it is not dried in time or is not dried to a safe storage moisture level (13% to 14%), the grain will become moldy and rotten. At present, the moisture content of grain is mainly reduced by natural drying and drying equipment. Natural drying is easily affected by weather factors, requires a large drying area, and requires manual turning, which is time-consuming and labor-intensive. Therefore, most people now use drying equipment to dry grain (materials) in large quantities to save time and effort.

[0003] Common drying equipment on the market includes hot air drying equipment and microwave drying equipment. Hot air drying equipment dries grain by blowing hot air. Therefore, the drying efficiency of grain in the drying barrel is low. Although microwave drying has high drying efficiency, the drying effect of grain farther away from the microwave source is not as good as that of grain closer to the microwave source. The grain is dried unevenly, which ultimately leads to poor grain drying quality. Summary of the Invention

[0004] The purpose of the present invention is to provide a novel grain microwave hot air drying device to solve the problems raised in the above background technology.

[0005] To achieve the above-mentioned object, the present invention provides the following technical solution: a novel microwave hot air drying device for grains, comprising a hot air device, a drying device, and a lifting device in sequence; the drying device comprises a drying chamber and a resonant cavity; a stirring mechanism for stirring the material is provided inside the drying chamber; and a microwave generating mechanism for changing the temperature inside the drying chamber is provided on the outer side of the resonant cavity;

[0006] The hot air device is used to blow hot air into the drying chamber, and the lifting device is used to lift the material;

[0007] The top of the lifting device is connected to the drying chamber via a circulating feed pipe, and the circulating feed pipe is used to transport the material in the lifting device into the drying chamber;

[0008] The bottom of the lifting device is connected to the drying chamber via a circulation hopper, and the circulation hopper is used to transport the material in the drying chamber to the lifting device.

[0009] Preferably, the drying chamber comprises an upper chamber and a lower chamber, the interior of the upper chamber is fixedly connected to a drying barrel, and the stirring mechanism is located inside the drying barrel;

[0010] The bottom of the drying barrel is fixedly connected to an air distribution plate, the air distribution plate is provided with a discharge port for discharging materials, and the discharge port is provided with a discharge valve;

[0011] An air outlet is provided on the top of the drying chamber.

[0012] Preferably, the stirring mechanism includes a stirring component and a driving component, the stirring component includes a stirrer shaft, a plurality of stirring blades are installed on the stirrer shaft, one end of the stirrer shaft is connected to the driving component, and the stirrer shaft is driven to rotate by the driving component.

[0013] Preferably, the lower chamber is provided with an air inlet on one side away from the circulation hopper and a discharge port on the other side, an air guide plate is fixedly connected to the interior of the lower chamber, a side of the air guide plate close to the discharge port is higher than the discharge port, and a through hole for passing the material is provided on the air guide plate;

[0014] A windshield for shielding the through hole is provided at the bottom of the through hole, and the windshield is movably connected to the side wall of the lower chamber;

[0015] A discharge plate is provided at the bottom of the windshield, and one side of the discharge plate close to the circulation hopper is lower than the other side.

[0016] Preferably, the lifting device includes a lifting casing, and a circulation hopper and a discharge hopper are respectively connected to both sides of the lifting casing. The top of the circulation hopper is located below the discharge port. A lifting auger for lifting materials is provided inside the lifting casing, and a lifting motor is installed on the top of the lifting auger.

[0017] Preferably, an axial center hole is provided at the bottom of the agitator shaft, and a plurality of air distribution holes communicating with the axial center hole are provided on the side of the agitator shaft.

[0018] Preferably, the microwave generating mechanism comprises a plurality of microwave sources fixedly connected to the side wall of the resonant cavity, and the microwave sources comprise two magnetrons;

[0019] The microwave generating mechanism further includes a microwave control module, which is used to independently control the power and working time of the microwave source.

[0020] Preferably, the hot air device includes a hot air pipe connected to the lower chamber, the other end of the hot air pipe is fixedly connected to a heater, and a fan is provided on the side of the heater away from the hot air pipe.

[0021] Preferably, the drying equipment further comprises a control device, which comprises a control screen, a hot air control module, a microwave control module, an agitator control module, an elevator control module and an automatic temperature control module.

[0022] Preferably, a microwave shield is fixedly connected to the bottom of the air distribution plate, and an optical fiber temperature sensor is installed on the side wall of the drying barrel;

[0023] A hot air temperature sensor is installed on the side wall of the lower chamber, and a flow meter is installed inside the hot air pipe;

[0024] The drying equipment further comprises a frame, on which the drying device and the hot air device are both mounted, and a plurality of moving wheels are fixedly mounted on the bottom of the frame.

[0025] Compared with the prior art, the present invention has the following beneficial effects:

[0026] A new type of grain microwave hot air drying equipment, which uses a hot air device, a drying device and a lifting device arranged in sequence, a stirring mechanism arranged inside the drying chamber and a microwave generating mechanism arranged inside the resonant cavity, so that the material is simultaneously subjected to microwave heating and drying and hot air drying in the drying chamber. During the drying process, the stirring mechanism stirs the material, changes the position of the material and facilitates the circulation of hot air, thereby greatly improving the uniformity of hot air drying and microwave drying and the drying efficiency. The drying chamber is connected to the bottom and top of the lifting device through a circulating hopper and a circulating feed pipe, which can enable the material to be dried multiple times in a cycle, thereby improving the drying quality of the material.

[0027] Hot air is blown to the surface of the material through the axial hole opened at the bottom of the agitator shaft, multiple air distribution holes opened on one side of the agitator shaft and ventilation holes on the air distribution plate, which can effectively improve the uniformity of hot air distribution and heating efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 It is a schematic diagram of the three-dimensional structure of the drying equipment of the present invention;

[0029] Figure 2 It is a schematic diagram of a three-dimensional cross-sectional structure of a drying device of the present invention;

[0030] Figure 3 It is a schematic diagram of the three-dimensional structure of the drying device of the present invention;

[0031] Figure 4 It is a schematic diagram of the three-dimensional structure of the stirring assembly of the present invention.

[0032] In the figure: 1. Support rod; 2. Moving wheel; 3. Frame; 4. Wind shield; 5. Discharge port; 6. Circulation hopper; 7. Discharge hopper; 8. Lifting auger; 9. Control panel; 10. Lifting casing; 11. Lifting motor; 12. Circulation feed pipe; 13. Air outlet; 14. Chain drive box cover; 15. Observation window; 16. Motor frame; 17. Stirring motor; 18. Flow meter; 19. Hot air duct; 20. Heater; 21. Fan; 22. Microwave source; 23. Resonant cavity; 25. Drying barrel; 26. Air distribution plate; 27. Hot air temperature sensor; 28. Air inlet; 29. ​​Air guide plate; 30. Discharge plate; 31. Discharge valve; 32. Microwave shield; 33. Fiber optic temperature sensor; 35. Bearing; 37. Discharge port; 38. Agitator shaft; 39. Stirring blade; 40. Air distribution hole; 41. Axis hole. DETAILED DESCRIPTION

[0033] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0034] It should be noted that, in the description of the present invention, the terms "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description. They do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0035] Furthermore, it should be understood that for the sake of ease of description, the sizes of the various components shown in the drawings are not drawn according to actual proportions. For example, the thickness or width of certain layers may be exaggerated relative to other layers.

[0036] It should be noted that like numbers and letters represent similar items in the following figures, so once an item is defined or described in one figure, it will not need to be further discussed and described in detail in the description of the subsequent figures.

[0037] like Figure 1-Figure 2As shown, the present invention provides a technical solution: a novel microwave hot air drying device for grains, comprising a drying device including a hot air device, a drying device and a lifting device in sequence, the drying device including a drying chamber and a resonance chamber 23, a stirring mechanism for stirring the material is provided inside the drying chamber, and a microwave generating mechanism for changing the temperature inside the drying chamber is provided on the outer side of the resonance chamber 23;

[0038] The hot air device is used to blow hot air into the drying chamber, and the lifting device is used to lift the material;

[0039] The top of the lifting device is connected to the drying chamber via a circulating feed pipe 12, which is used to transport the material in the lifting device into the drying chamber;

[0040] The bottom of the lifting device is connected to the drying chamber via a circulation hopper 6, which is used to transport the material in the drying chamber to the lifting device.

[0041] The drying equipment further comprises a control device, which comprises a control panel 9, a hot air control module, a microwave control module, a stirrer control module, an elevator control module and an automatic temperature control module.

[0042] Specifically, the material is poured into the circulation hopper 6, the material enters the lifting device, and after being transported to the top of the lifting device by the lifting device, it is transported to the drying chamber through the circulation feed pipe 12. While the material is stirred by the stirring mechanism in the drying chamber, the hot air device blows hot air into the drying chamber, and the microwave generating mechanism works to heat the material to achieve the effect of drying the material. After the first drying of the material is completed, the material in the drying chamber continues to pass through the circulation hopper 6 into the lifting device for secondary drying, and finally the dried material is taken out.

[0043] like Figure 2 and Figure 3The side wall of the drying chamber is equipped with a lighting lamp and an observation window 15 for observing the drying condition of the material in the drying chamber. The observation window 15 is composed of high-strength transparent glass and a microwave shield 32 to prevent microwave leakage. The drying chamber includes an upper chamber and a lower chamber. The resonant cavity 23 is located outside the upper chamber, and the lower chamber is located at the bottom of the upper chamber. A drying barrel 25 is fixedly connected to the interior of the upper chamber. An optical fiber temperature sensor 33 is installed on the side wall of the drying barrel 25. The stirring mechanism is located inside the drying barrel 25, and the bottom of the drying barrel 25 is fixedly connected to the resonant cavity 23. It is connected to an air distribution plate 26, and a microwave shield 32 is fixedly connected to the bottom of the air distribution plate 26 to prevent microwave leakage. The size of the ventilation holes on the air distribution plate 26 is smaller than the size of the material, so that only hot air can pass through the air distribution plate 26, and the material cannot fall into the lower chamber from the ventilation holes. A discharge port 37 for discharging material is provided on the air distribution plate 26, and a discharge valve 31 is provided on the discharge port 37. An air outlet 13 is provided on the top of the drying chamber. The hot air blown out by the hot air device passes through the drying barrel 25 to dry the material and is discharged from the air outlet 13.

[0044] An air inlet 28 is provided on the side of the lower chamber away from the circulation hopper 6, and a discharge port 5 is provided on the other side. An air guide plate 29 is fixedly connected to the inside of the lower chamber. The side of the air guide plate 29 close to the discharge port 5 is higher than the discharge port 5. A through hole for passing the material is provided on the air guide plate 29. The through hole is located directly below the discharge port 37. A wind shield 4 for blocking the through hole is provided at the bottom of the through hole. The wind shield 4 is movably connected to the side wall of the lower chamber. A discharge plate 30 is provided at the bottom of the wind shield 4. The side of the discharge plate 30 close to the circulation hopper 6 is lower than the other side.

[0045] Specifically, the air guide plate 29 is a quarter-circular arc plate, and the end of the air guide plate 29 close to the air inlet 28 is lower than the air inlet 28, and the side of the air guide plate 29 close to the air inlet 28 is lower than the other side, which can well guide the hot air blown from the air inlet 28 into the interior of the drying barrel 25. The size of the wind shield 4 is larger than the size of the through hole, and the wind shield 4 is slidingly connected to the side wall of the lower chamber. When the material inside the drying barrel 25 needs to be discharged into the lower chamber, the discharge valve 31 is opened, and the wind shield 4 is pulled out to make way for the through hole. The material falls from the discharge port 37 and is discharged to the discharge plate 30 through the through hole. Since the discharge plate 30 is placed at an angle, the material slides from the discharge plate 30 into the circulation hopper 6.

[0046] like Figure 2-Figure 4As shown, preferably, the stirring mechanism includes a stirring assembly and a driving assembly. The stirring assembly includes a stirrer shaft 38. A plurality of stirring blades 39 are mounted on the stirrer shaft 38. The angle of the stirring blades 39 can be adjusted. One end of the stirrer shaft 38 is connected to the driving assembly, and the stirrer shaft 38 is driven to rotate by the driving assembly. An axial hole 41 is provided at the bottom of the stirrer shaft 38, and a plurality of air distribution holes 40 communicating with the axial hole 41 are provided on the side of the stirrer shaft 38. A bearing 35 is fixedly mounted at the center of the air balancing plate 26. The stirrer shaft 38 is connected to the air balancing plate 26 through the bearing 35. Hot air can enter the stirrer shaft 38 through the axial hole 41 and then be blown out through the air distribution holes 40 to improve the heating efficiency of the hot air.

[0047] Furthermore, the driving assembly includes a stirring motor 17, a transmission chain and a motor frame 16. The stirring motor 17 is fixedly mounted on the motor frame 16. The output end of the stirring motor 17 is provided with a chain transmission box cover 14. The transmission chain is located inside the chain transmission box cover 14. The output shaft of the stirring motor 17 passes through the chain transmission box cover 14 and is movably connected to the transmission chain. The stirring motor 17 drives the agitator shaft 38 to rotate through the transmission chain, thereby driving the multiple stirring blades 39 installed on the agitator shaft 38 to rotate around the axis of the agitator shaft 38. The stirring material is stirred by the stirring blades 39, so that the material can be dried more evenly and the drying effect is better. It should be noted that the speed of the stirring motor 17 can be controlled and adjusted by the control panel 9.

[0048] Preferably, the lifting device includes a lifting casing 10, and the two sides of the lifting casing 10 are respectively connected to a circulation hopper 6 and a discharge hopper 7, the top of the circulation hopper 6 is located below the discharge port 37, and a lifting auger 8 for lifting materials is provided inside the lifting casing 10, and a lifting motor 11 is installed on the top of the lifting auger 8.

[0049] Specifically, the material enters the lifting housing 10 from the circulation hopper 6, and the lifting motor 11 drives the lifting auger 8 to rotate, so that the lifting auger 8 can transport the material upward, and then enter the drying chamber for drying through the circulation feed pipe 12. The lifting device can circulate the material, so that the material can be dried multiple times, improving the drying effect of the material and thus improving the drying quality.

[0050] Preferably, the hot air device includes a hot air pipe 19 connected to the lower chamber, the other end of the hot air pipe 19 is fixedly connected to a heater 20, a fan 21 is provided on the side of the heater 20 away from the hot air pipe 19, a flow meter 18 is installed inside the hot air pipe 19, and a hot air temperature sensor 27 is installed on the side wall of the lower chamber.

[0051] Specifically, when fan 21 is operating, air is heated by heater 20, passes through hot air pipe 19, and enters the lower chamber through air inlet 28. The air is then redirected by air guide plate 29 and sent into drying barrel 25 to dry the material. It should be noted that after drying the material, fan 21 continues to operate until the temperature inside drying barrel 25 drops to room temperature.

[0052] Preferably, the microwave generating mechanism includes a plurality of microwave sources 22 fixedly connected to the side wall of the resonant cavity 23, the microwave source 22 includes two magnetrons, and the microwave generating mechanism also includes a microwave control module, which is used to individually control the power and working time of the microwave source 22. The three microwave sources 22 each include two magnetrons distributed around the drying cavity, with a frequency of 2450 MHz. The power of each magnetron is continuously adjustable between 0-1000 W, and each magnetron can be individually controlled by the microwave control module.

[0053] When the drying process starts, connect the drying equipment to the power supply, open the equipment control interface through the control screen 9, click the signal status panel to view the sensor communication status, and set the microwave power, microwave temperature range (including microwave temperature lower limit, microwave temperature middle limit, microwave temperature upper limit and microwave safety temperature), microwave operation time of each section (including 6 sections), hot air target temperature, hot air safety temperature, hot air volume, stirring motor 17 speed and lifting motor 11 speed through the parameter setting panel.

[0054] As a specific embodiment, the drying equipment further includes a frame 3, on which the drying device and the hot air device are both mounted. A plurality of movable wheels 2 are fixedly mounted on the bottom of the frame 3 and the bottom of the lifting housing 10. It should be noted that the movable wheels 2 are equipped with brake feet. When the brake feet are lowered, the movable wheels 2 cannot move. Support rods 1 are mounted on both sides of the frame 3 at the bottom of the drying device. The support rods 1 are screwed to the frame 3. When the frame 3 does not need to be moved, the support rods 1 are screwed to rotate it downward and against the ground to provide support.

[0055] While embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions, and variations may be made to these embodiments without departing from the principles and spirit of the invention, and that the scope of the invention is defined by the appended claims and their equivalents.

Claims

1. A new type of grain microwave hot air drying equipment, characterized by: The drying device comprises a hot air device, a drying device and a lifting device in sequence, the drying device comprises a drying chamber and a resonance chamber (23), a stirring mechanism for stirring materials is provided inside the drying chamber, and a microwave generating mechanism for changing the temperature inside the drying chamber is provided on the outer side of the resonance chamber (23); The hot air device is used to blow hot air into the drying chamber, and the lifting device is used to lift the material; The top of the lifting device is connected to the drying chamber via a circulating feed pipe (12), and the circulating feed pipe (12) is used to transport the material in the lifting device into the drying chamber; The bottom of the lifting device is connected to the drying chamber via a circulation hopper (6), and the circulation hopper (6) is used to transport the material in the drying chamber to the lifting device; The drying chamber comprises an upper chamber and a lower chamber, a drying barrel (25) is fixedly connected to the interior of the upper chamber, an optical fiber temperature sensor (33) is installed on the side wall of the drying barrel (25), and the stirring mechanism is located inside the drying barrel (25); The bottom of the drying barrel (25) is fixedly connected to an air distribution plate (26), the air distribution plate (26) is provided with a discharge port (37) for discharging materials, and the discharge port (37) is provided with a discharge valve (31); An air outlet (13) is provided at the top of the drying chamber; The side wall of the drying chamber is provided with an illumination lamp and an observation window (15), and the observation window (15) is composed of high-strength transparent glass and a microwave shield (32); An air inlet (28) is provided on one side of the lower chamber away from the circulation hopper (6), and a discharge port (5) is provided on the other side. An air guide plate (29) is fixedly connected to the interior of the lower chamber. The side of the air guide plate (29) close to the discharge port (5) is higher than the discharge port (5). A through hole for passing materials is provided on the air guide plate (29); the air guide plate (29) is a quarter-circular arc plate. A windshield (4) for shielding the through hole is provided at the bottom of the through hole, and the windshield (4) is movably connected to the side wall of the lower chamber; A discharge plate (30) is provided at the bottom of the windshield (4), and the side of the discharge plate (30) close to the circulation hopper (6) is lower than the other side; The hot air device comprises a hot air pipe (19) connected to the lower chamber, the other end of the hot air pipe (19) is fixedly connected to a heater (20), and a fan (21) is provided on a side of the heater (20) away from the hot air pipe (19); A microwave shield (32) is fixedly connected to the bottom of the air distribution plate (26), and an optical fiber temperature sensor (33) is installed on the side wall of the drying barrel (25); A hot air temperature sensor (27) is installed on the side wall of the lower chamber, and a flow meter (18) is installed inside the hot air pipe (19); The drying equipment further comprises a frame (3), on which the drying device and the hot air device are both mounted, and a plurality of moving wheels (2) are fixedly mounted on the bottom of the frame (3).

2. The novel grain microwave hot air drying equipment according to claim 1, characterized in that: The stirring mechanism comprises a stirring assembly and a driving assembly. The stirring assembly comprises a stirring shaft (38). A plurality of stirring blades (39) are mounted on the stirring shaft (38). One end of the stirring shaft (38) is connected to the driving assembly, and the stirring shaft (38) is driven to rotate by the driving assembly.

3. The novel grain microwave hot air drying equipment according to claim 1 is characterized in that: The lifting device includes a lifting casing (10), and a circulation hopper (6) and a discharge hopper (7) are connected to both sides of the lifting casing (10), the top of the circulation hopper (6) is located below the discharge port (37), and a lifting auger (8) for lifting materials is provided inside the lifting casing (10), and a lifting motor (11) is installed on the top of the lifting auger (8).

4. The novel grain microwave hot air drying equipment according to claim 2, characterized in that: The bottom of the stirrer shaft (38) is provided with an axial center hole (41), and the side surface of the stirrer shaft (38) is provided with a plurality of air distribution holes (40) which are in communication with the axial center hole (41).

5. The novel grain microwave hot air drying equipment according to claim 1 is characterized in that: The microwave generating mechanism comprises a plurality of microwave sources (22) fixedly connected to the side wall of the resonant cavity (23), and the microwave sources (22) comprise two magnetrons; The microwave generating mechanism further comprises a microwave control module, and the microwave control module is used to independently control the power and working time of the microwave source (22).

6. The novel microwave hot air drying equipment for grain according to claim 1, characterized in that: The drying equipment further comprises a control device, which comprises a control panel (9), a hot air control module, a microwave control module, a stirrer control module, an elevator control module and an automatic temperature control module.

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