Rice milling processing integrated drying waste heat recovery device and processing method

Abstract

The invention relates to the technical field of rice milling processing, and provides a rice milling processing integrated drying waste heat recovery device and a processing method.The rice milling processing integrated drying waste heat recovery device comprises a box body, the interior of the box body is divided into a first bin and a second bin which are independent from each other, and a driving mechanism is arranged outside the first bin; the top of the first bin is provided with a spiral feeding mechanism which is driven by a driving mechanism to conduct spiral feeding. A first inner shell is fixed to one side, below the spiral feeding mechanism, of the first bin, and a pneumatic mechanism for generating airflow under synchronous driving of the driving mechanism and a heater for heating the airflow generated by the pneumatic mechanism are arranged in the first inner shell. The three functions of drying, separation and waste heat recovery are integrated in the same box body to form a closed-loop system, through the collaborative design of spiral feeding, pneumatic centrifugal separation, heat recovery and cyclic utilization, the whole-process integrated treatment from raw material conveying to finished product collection is achieved, and the equipment compactness and the production efficiency are greatly improved.

Description

Technical Field

[0001] The present invention relates to the technical field of rice milling, and in particular to a rice milling integrated drying waste heat recovery device and a processing method. Background Art

[0002] Rice is a kind of grain that needs to be milled by a rice mill. During the rice milling process, the rice needs to be dried to prevent it from being too wet and moldy, which affects the processing quality of the rice. The search announcement number CN221349658U discloses a combined rice milling machine grain drying device, including a drying box and a fan for drying rice, a conveyor is installed on the bottom wall of the drying box, a telescopic outer plate is fixedly connected to the top wall of the drying box, a slide groove is provided at the bottom end of the telescopic outer plate, the telescopic outer plate is slidably connected to a slide plate through the slide groove, the bottom end of the slide plate is fixedly connected to the telescopic inner plate, the bottom end of the telescopic inner plate extends out of the telescopic outer plate, a threaded through groove is provided at the top of the slide plate, the slide plate is threadedly connected to a threaded rod through the threaded through groove, the top of the threaded rod is fixedly connected to a rotating block, the top of the rotating block is fixedly connected to a connecting block, the top of the connecting block is fixedly connected to a knob, the inner top wall of the telescopic outer plate is rotatably connected to the rotating block, and the bottom end of the knob is rotatably connected to the drying box. The rice milling machine controls the transportation thickness of the rice by controlling the distance between the telescopic inner plate and the conveyor belt of the conveyor, so as to improve the drying effect of the rice by the drying device.

[0003] However, the above drying device still has the following problems: It only focuses on local drying in the broken rice screening area, has a single function, and needs to be used in series with other equipment; The hot air flow is directly discharged without recovering the waste heat, resulting in low energy utilization rate; Relying on the broken rice sieve to shake and separate the broken rice is likely to leave impurities, thus affecting the quality of the recovered products. Summary of the Invention

[0004] The present invention proposes a rice milling integrated drying waste heat recovery device and a processing method, which solves the problems of single function, direct discharge of hot air flow and easy residual impurities in the prior art.

[0005] The technical solution of the present invention is as follows: A rice milling integrated drying waste heat recovery device comprises a box body, wherein the box body is divided into two independent first and second compartments on the left and right sides, and a driving mechanism is provided outside the first compartment; A screw feeding mechanism for performing screw feeding driven by a driving mechanism is provided on the top of the first chamber; A first inner shell is fixed to one side of the first chamber below the spiral feeding mechanism, and a pneumatic mechanism for generating airflow under synchronous drive of the driving mechanism and a heater for heating the airflow generated by the pneumatic mechanism are provided in the first inner shell; A diversion mechanism is provided between the first chamber and the second chamber to separate rice grains from rice husks and dust by the centrifugal effect of the rotation of the pneumatic mechanism; The second chamber is provided with a circulating condensing mechanism for recovering waste heat from the exhaust air flow in the diversion mechanism, and an air guide duct for supplying air outside the box to the air inlet of the first inner shell through the circulating condensing mechanism.

[0006] Preferably, the driving mechanism includes a motor, the motor is fixed outside the box through a mounting base on one side, and a driving gear is fixed to the output end of the motor.

[0007] Preferably, the spiral feeding mechanism includes a feeding barrel, a first driven shaft is arranged in the feeding barrel along its axial direction, the first driven shaft is rotatably connected to the box body, one end of the first driven shaft passes through the outside of the box body and is fixed with a first driven gear meshing with the driving gear, and the first driven shaft is located at the outside of the feeding barrel where the feeding barrel is located. A screw dragon is fixed, and the top of one end of the feeding barrel close to the first driven gear is connected to a feed pipe, and a feed hopper connected to the feed pipe is fixed on the top of the box body, and the bottom of the other end of the feeding barrel is connected to a discharge pipe.

[0008] Preferably, the pneumatic mechanism includes a second driven shaft, which is rotatably connected to the box body, one end of the second driven shaft extends outside the box body and is fixed with a second driven gear that meshes with the driving gear, the second driven shaft is located in the first inner shell and is fixed with fan blades on the outside, and the second driven shaft is fixed with a conical inner cover on the outside of one end away from the second driven gear, and a number of evenly distributed spacers are fixed on the outer conical surface of the conical inner cover.

[0009] Preferably, the diversion mechanism includes a conduit, which is fixed in the box body, and a conical outer cover is fixed at one end of the conduit located in the first chamber, and a through hole communicating with the discharge pipe is provided on the conical outer cover. The other end of the conduit extends into the second chamber and is provided with an upper opening and a lower opening located below the upper opening. An interception net is fixed in the upper opening, and the upper opening leads to the outside of the box through an exhaust pipe.

[0010] Preferably, the conical outer cover is sleeved outside the conical inner cover and maintains a certain gap between the conical outer cover and the conical inner cover, and the conical outer cover and the conical inner cover have the same taper.

[0011] Preferably, the circulating condensing mechanism includes a second inner shell, a circulating pump, a first condensing coil and a second condensing coil, the second inner shell is coaxially sleeved outside the conduit and fixed on the inner wall of the second chamber, the first condensing coil is spirally arranged in the conduit, and the second condensing coil is spirally arranged in the annular cavity between the conduit and the second inner shell.

[0012] Preferably, the input end of the first condensing coil is communicated with the output end of the second condensing coil, the output end of the first condensing coil is communicated with the input end of a circulation pump, and the output end of the circulation pump is communicated with the input end of the second condensing coil.

[0013] Preferably, the air duct assembly includes a first air duct and a second air duct, one end of the first air duct leads to the outside of the box, and the other end of the first air duct leads to the annular cavity between the duct and the second inner shell, one end of the second air duct leads to the annular cavity between the duct and the second inner shell, and the other end of the second air duct leads to the first inner shell.

[0014] Based on the above-mentioned rice milling integrated drying waste heat recovery device, the present invention also proposes a rice milling method, which includes the following steps: The spiral feeding mechanism is driven by the driving mechanism to convey the milled rice to the diversion mechanism, and the pneumatic mechanism is driven by the driving mechanism to generate airflow and is heated by the heater, thereby drying the conveyed milled rice; The centrifugal force generated by the pneumatic mechanism during rotation separates the rice grains from the rice husks and dust in the rice milling process. The separated rice grains fall into the first chamber under the action of gravity and are collected. The separated rice husks and dust are introduced into the second chamber through the diversion mechanism for collection. The heat in the air flow in the diversion mechanism is circulated and absorbed by the circulating condensing mechanism, and the air that is filtered, intercepted and heat-absorbed is discharged out of the box, and the air guide duct introduces the air outside the box into the circulating condensing mechanism. The air is preheated by the heat absorbed by the circulating condensing mechanism and provided to the air inlet of the first inner shell, thereby realizing the recycling of heat.

[0015] The beneficial effects of the present invention are: This invention integrates the three functions of drying, separation, and waste heat recovery into the same chamber (first and second chambers), forming a closed-loop system. Through the coordinated design of spiral feeding, pneumatic centrifugal separation, and heat recovery and recycling, it achieves integrated processing of the entire process from raw material transportation to finished product collection, significantly improving the compactness of the equipment and production efficiency. The present invention absorbs exhaust gas heat through the first condensing coil (inside the duct) and the second condensing coil (in the annular cavity). The circulating pump drives the cooling medium to circulate and absorb heat. The recovered heat is used to preheat the external fresh air through the air guide pipe, reducing heater energy consumption, achieving efficient transfer of exhaust gas heat to fresh air, significantly reducing unit energy consumption, and complying with the concept of green manufacturing. In the present invention, centrifugal force is generated by the rotation of the pneumatic mechanism (fan blades + conical inner cover), and combined with the gap design of the conical outer cover, efficient graded separation of rice grains, rice husks and dust is achieved. The diversion mechanism is provided with an interception net and a lower outlet. Double filtration ensures the separation of impurities and air, improves the quality of rice, and realizes the centralized collection of rice husks and dust. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0017] Figure 1 This is a schematic diagram of the partial cross-sectional structure of the box body proposed by the present invention; Figure 2 This is a schematic diagram of the half-section structure of the box body proposed by the present invention; Figure 3 This is a schematic diagram of the driving mechanism structure proposed by the present invention; Figure 4 This is a schematic diagram of the half-section structure of the spiral feeding mechanism proposed in the present invention; Figure 5 This is a schematic diagram of the structure of the pneumatic mechanism proposed in the present invention; Figure 6 This is a schematic diagram of the diversion mechanism structure proposed by the present invention; Figure 7 This is a schematic diagram of the structure of the circulating condensation mechanism proposed in the present invention; Figure 8 for Figure 2 A in the middle is an enlarged structural diagram; In the figure: 1. Box; 11. First chamber; 12. Second chamber; 13. Feed hopper; 14. Exhaust duct; 2. Driving mechanism; 21. Motor; 22. Mounting base; 23. Driving gear; 3. Screw feeding mechanism; 31. Feeding barrel; 32. First driven shaft; 33. First driven gear; 34. Auger; 35. Feed pipe; 36. Discharge pipe; 4. First inner shell; 5. Pneumatic mechanism; 51. Second driven shaft; 52. Second driven gear; 53. Fan blade; 54. Conical inner cover; 55. Spacer; 6. Heater; 7. Diverter mechanism; 71. Conduit; 72. Conical outer cover; 73. Through hole; 74. Upper opening; 75. Lower opening; 76. Intercepting net; 8. Circulating condensing mechanism; 81. Second inner shell; 82. Circulating pump; 83. First condensing coil; 84. Second condensing coil; 9. First air duct; 10. Second air duct. DETAILED DESCRIPTION

[0018] The following will be combined with the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described 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 any creative efforts are within the scope of protection of the present invention.

[0019] See also Figure 1 and Figure 2The present invention provides a technical solution: a rice milling integrated drying waste heat recovery device, comprising a box body 1, the box body 1 is divided into two independent first chambers 11 and second chambers 12 on the left and right, the first chamber 11 and the second chamber 12 are independently partitioned for easy maintenance, a driving mechanism 2 is arranged outside the first chamber 11; a spiral feeding mechanism 3 for spiral feeding driven by the driving mechanism 2 is arranged on the top of the first chamber 11; a first inner shell 4 is fixed on one side of the first chamber 11 below the spiral feeding mechanism 3, a pneumatic mechanism 5 for generating airflow driven synchronously by the driving mechanism 2, and a heater 6 for heating the airflow generated by the pneumatic mechanism 5 are arranged in the first inner shell 4; a centrifugal force is arranged between the first chamber 11 and the second chamber 12 to move rice grains by the centrifugal effect of the pneumatic mechanism 5 when it rotates A diversion mechanism 7 is provided for separating the rice husks and dust; a circulating condensing mechanism 8 is provided in the second chamber 12 for recovering the waste heat from the heat in the exhaust air flow from the diversion mechanism 7, and an air guide duct is provided for supplying the air outside the box body 1 to the air inlet of the first inner shell 4 through the circulating condensing mechanism 8. Through the above design, the three functions of drying, separation and waste heat recovery can be integrated into the same box body to form a closed-loop system. Through the coordinated design of spiral feeding, pneumatic centrifugal separation, heat recovery and recycling, the whole process from raw material transportation to finished product collection is realized. The compactness and production efficiency of the equipment are greatly improved, the waste heat recovery rate is significantly improved, the consumption of fossil fuels is reduced, and carbon emissions are reduced. The separated rice husks and dust can be centrally processed (such as biomass energy utilization), thereby increasing the added value of the industrial chain.

[0020] See also Figure 3 The driving mechanism 2 includes a motor 21, which is fixed to the outside of the box body 1 through a mounting base 22 on one side. A driving gear 23 is fixed to the output end of the motor 21. The single motor 21 synchronously drives the spiral feeding, pneumatic mechanism 5 and condensation system through a gear set, reducing power loss and simplifying operation.

[0021] See also Figure 2 and Figure 4 The spiral feeding mechanism 3 includes a feeding barrel 31, in which a first driven shaft 32 is arranged along its axial direction. The first driven shaft 32 is rotatably connected to the box body 1, and one end of the first driven shaft 32 passes through the outside of the box body 1 and is fixed with a first driven gear 33 that meshes with the driving gear 23. The first driven shaft 32 is located on the outside of the feeding barrel 31 where an auger 34 is fixed. The top of one end of the feeding barrel 31 close to the first driven gear 33 is connected to a feeding pipe 35, and a feeding hopper 13 connected to the feeding pipe 35 is fixed on the top of the box body 1. The other end of the feeding barrel 31 is connected to a discharge pipe 36 at the bottom.

[0022] See also Figure 2 and Figure 5The pneumatic mechanism 5 includes a second driven shaft 51, which is rotatably connected to the box body 1. One end of the second driven shaft 51 passes through the outside of the box body 1 and is fixed with a second driven gear 52 that meshes with the driving gear 23. The second driven shaft 51 is located in the first inner shell 4 and is fixed with fan blades 53 on the outside. A conical inner cover 54 is fixed on the outside of one end of the second driven shaft 51 away from the second driven gear 52. A number of evenly distributed spacers 55 are fixed on the outer conical surface of the conical inner cover 54. The centrifugal force is generated by the rotation of the pneumatic mechanism 5 (fan blades 53 + conical inner cover 54). Combined with the gap design of the conical outer cover 72, efficient graded separation of rice grains, rice husks and dust is achieved.

[0023] See also Figure 2 and Figure 6 The diversion mechanism 7 includes a conduit 71, which is fixed in the box body 1. A conical outer cover 72 is fixed at one end of the conduit 71 located in the first chamber 11. The conical outer cover 72 is provided with a through hole 73 communicating with the discharge pipe 36. The other end of the conduit 71 extends into the second chamber 12 and is provided with an upper opening 74 and a lower opening 75 located below the upper opening 74. An interception net 76 is fixed in the upper opening 74, and the upper opening 74 leads to the outside of the box body 1 through the exhaust pipe 14. The conical outer cover 72 is sleeved on the outside of the conical inner cover 54 and maintains a certain gap with the conical inner cover 54. The conical outer cover 72 has the same taper as the conical inner cover 54. The diversion mechanism 7 is provided with an interception net 76 and a lower opening 75 to ensure the separation of impurities and air through filtration, thereby improving the quality of rice.

[0024] See also Figure 2 、 Figure 7 、 Figure 8 The circulating condensing mechanism 8 includes a second inner shell 81, a circulating pump 82, a first condensing coil 83 and a second condensing coil 84. The second inner shell 81 is coaxially sleeved on the outside of the conduit 71 and fixed on the inner wall of the second chamber 12. The first condensing coil 83 is spirally arranged in the conduit 71, and the second condensing coil 84 is spirally arranged in the annular cavity between the conduit 71 and the second inner shell 81. The input end of the first condensing coil 83 is connected to the output end of the second condensing coil 84, and the output end of the first condensing coil 83 is connected to the input end of the circulating pump 82. The output end of the circulating pump 82 is connected to the input end of the second condensing coil 84. The exhaust heat is absorbed through the first condensing coil 83 and the second condensing coil 84, and the circulating pump 82 drives the cooling medium to circulate and absorb heat. The recovered heat is used to preheat the external fresh air through the air guide pipe, reducing the energy consumption of the heater, realizing the efficient transfer of exhaust gas heat to fresh air, significantly reducing unit energy consumption, and complying with the green manufacturing concept.

[0025] See also Figure 2The air duct includes a first air duct 9 and a second air duct 10. One end of the first air duct 9 leads to the outside of the box body 1, and the other end of the first air duct 9 leads to the annular cavity between the conduit 71 and the second inner shell 81. One end of the second air duct 10 leads to the annular cavity between the conduit 71 and the second inner shell 81, and the other end of the second air duct 10 leads to the first inner shell 4.

[0026] Based on the rice milling integrated drying waste heat recovery device in the above embodiment, the present invention further proposes a rice milling method, which includes the following steps: The spiral feeding mechanism 3 is driven by the driving mechanism 2 to convey the milled rice to be processed into the diversion mechanism 7, and the pneumatic mechanism 5 is driven by the driving mechanism 2 to generate airflow and is heated by the heater 6, thereby drying the transported milled rice; The centrifugal force generated by the pneumatic mechanism 5 during rotation separates the rice grains from the rice husks and dust in the rice milling process. The separated rice grains fall into the first chamber 11 under the action of gravity and are collected. The separated rice husks and dust are introduced into the second chamber 12 through the diversion mechanism 7 for collection. The heat in the air flow in the diversion mechanism 7 is circulated and absorbed by the circulation condensing mechanism 8, and the air that is filtered, intercepted and heat-absorbed is discharged outside the box 1, and the air guide duct introduces the air outside the box 1 into the circulation condensing mechanism 8. The air is preheated by the heat absorbed by the circulation condensing mechanism 8 and provided to the air inlet of the first inner shell 4, thereby realizing the recycling of heat.

[0027] The working principle and use process of the present invention are as follows: During operation, milled rice is added through the feed hopper 13 and introduced into the feed tube 31 through the feed pipe 35. The motor 21 drives the driving gear 23, which in turn drives the first driven shaft 32 to rotate under the meshing of the driving gear 23 and the first driven gear 33. The milled rice is then transported to the other end by the spiral guide of the auger 34 and then guided by the discharge pipe 36 to the gap between the conical outer cover 72 and the conical inner cover 54. The second driven shaft 51 is rotated under the guidance of the driving gear 23 and the second driven gear 52, and the fan blades 53 outside the second driven shaft 51 are rotated to generate airflow, which is heated by the heater 6 and blown toward the conical inner cover 54. The conical inner cover 54 rotates synchronously with the second driven shaft 51, thereby generating centrifugal force on the rice grains passing between the conical outer cover 72 and the conical inner cover 54 through the spacers 55 on its outer conical surface. Under the action of the centrifugal force, the rice grains are spirally thrown out along the gap. Then, in conjunction with the recoil effect of the conical inner cover 54, the heated airflow fully dries the rice grains. The rice husks and dust in the rice grains are guided along the duct 71 toward the second chamber 12 by the airflow in the gap. The air enters the exhaust duct 14 through the upper opening 74 and is then discharged to the outside of the housing 1 through the exhaust duct 14. The dust in the air is intercepted by the interception net 76 and falls into the second chamber 12 through the lower opening 75 under the action of gravity. When the heated air flow passes through the duct 71, it is absorbed by the cooling medium with a lower temperature in the first condensing coil 83. The cooling medium that has absorbed heat is transported by the circulating pump 82 into the second condensing coil 84 between the duct 71 and the second inner shell 81, and the first air duct 9 introduces external air into the annular cavity between the duct 71 and the second inner shell 81, thereby cooling the cooling medium that has absorbed heat in the second condensing coil 84. The cooled cooling medium then enters the first condensing coil 83 for circulation and heat absorption, and the air that has absorbed the heat from the cooling medium in the second condensing coil 84 is preheated and then introduced into the first inner shell 4 through the second air duct 10, thereby realizing heat recycling.

[0028] This device solves the problems of low drying efficiency, high energy consumption, and incomplete impurity separation of traditional rice mills through functional integration, closed-loop recovery of waste heat, centrifugal separation technology, and automated collaborative design. It achieves green and low-carbon production while improving rice quality, and has significant industrial application value and market competitiveness.

[0029] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A rice milling integrated drying waste heat recovery device, comprising a box (1), characterized in that: The box body (1) is divided into two independent left and right first chambers (11) and second chambers (12), and a driving mechanism (2) is provided outside the first chamber (11); A screw feeding mechanism (3) for performing screw feeding driven by a driving mechanism (2) is provided on the top of the first chamber (11); A first inner shell (4) is fixed to one side of the first chamber (11) below the spiral feeding mechanism (3), and a pneumatic mechanism (5) for generating an airflow under synchronous driving of the driving mechanism (2) and a heater (6) for heating the airflow generated by the pneumatic mechanism (5) are provided in the first inner shell (4); A diversion mechanism (7) is provided between the first chamber (11) and the second chamber (12) for separating rice grains from rice husks and dust by the centrifugal action of the pneumatic mechanism (5) during rotation; The second chamber (12) is provided with a circulating condensing mechanism (8) for recovering waste heat from the exhaust airflow in the diversion mechanism (7), and an air guide duct for supplying the external air of the box (1) to the air inlet of the first inner shell (4) through the circulating condensing mechanism (8).

2. The rice milling integrated drying waste heat recovery device according to claim 1 is characterized in that: The driving mechanism (2) comprises a motor (21), the motor (21) being fixed to the outside of the box (1) via a mounting seat (22) on one side, and a driving gear (23) being fixed to the output end of the motor (21).

3. The rice milling integrated drying waste heat recovery device according to claim 2, characterized in that: The spiral feeding mechanism (3) includes a feeding barrel (31), a first driven shaft (32) is arranged in the feeding barrel (31) along its axial direction, the first driven shaft (32) is rotatably connected to the box body (1), one end of the first driven shaft (32) passes through the outside of the box body (1) and is fixed with a first driven gear (33) meshing with the driving gear (23), an auger (34) is fixed outside the portion of the first driven shaft (32) where the feeding barrel (31) is located, a feeding pipe (35) is connected to the top of one end of the feeding barrel (31) close to the first driven gear (33), a feeding hopper (13) connected to the feeding pipe (35) is fixed to the top of the box body (1), and a discharge pipe (36) is connected to the bottom of the other end of the feeding barrel (31).

4. The rice milling integrated drying waste heat recovery device according to claim 2, characterized in that: The pneumatic mechanism (5) includes a second driven shaft (51), the second driven shaft (51) being rotatably connected to the housing (1), one end of the second driven shaft (51) extending outside the housing (1) and being fixed with a second driven gear (52) meshing with the driving gear (23), a fan blade (53) being fixed on the outside of the portion of the second driven shaft (51) located inside the first inner shell (4), a conical inner cover (54) being fixed on the outside of one end of the second driven shaft (51) away from the second driven gear (52), and a plurality of evenly distributed spacers (55) being fixed on the outer conical surface of the conical inner cover (54).

5. The rice milling integrated drying waste heat recovery device according to claim 4 is characterized in that: The diversion mechanism (7) includes a conduit (71), which is fixed in the box body (1). One end of the conduit (71) located in the first chamber (11) is fixed with a conical outer cover (72), and the conical outer cover (72) is provided with a through hole (73) communicating with the discharge pipe (36). The other end of the conduit (71) extends into the second chamber (12) and is provided with an upper opening (74) and a lower opening (75) located below the upper opening (74). An interception net (76) is fixed in the upper opening (74), and the upper opening (74) leads to the outside of the box body (1) through an exhaust pipe (14).

6. The rice milling integrated drying waste heat recovery device according to claim 5, characterized in that: The conical outer cover (72) is sleeved outside the conical inner cover (54) and maintains a certain gap with the conical inner cover (54). The conical outer cover (72) and the conical inner cover (54) have the same taper.

7. The rice milling integrated drying waste heat recovery device according to claim 5, characterized in that: The circulating condensing mechanism (8) includes a second inner shell (81), a circulating pump (82), a first condensing coil (83) and a second condensing coil (84); the second inner shell (81) is coaxially sleeved outside the conduit (71) and fixed on the inner wall of the second chamber (12); the first condensing coil (83) is spirally arranged in the conduit (71); and the second condensing coil (84) is spirally arranged in the annular cavity between the conduit (71) and the second inner shell (81).

8. The rice milling integrated drying waste heat recovery device according to claim 7, characterized in that: The input end of the first condensing coil (83) is communicated with the output end of the second condensing coil (84), the output end of the first condensing coil (83) is communicated with the input end of the circulation pump (82), and the output end of the circulation pump (82) is communicated with the input end of the second condensing coil (84).

9. The rice milling integrated drying waste heat recovery device according to claim 8, characterized in that: The air duct assembly comprises a first air duct (9) and a second air duct (10), one end of the first air duct (9) leads to the outside of the box body (1), and the other end of the first air duct (9) leads to the annular cavity between the conduit (71) and the second inner shell (81), one end of the second air duct (10) leads to the annular cavity between the conduit (71) and the second inner shell (81), and the other end of the second air duct (10) leads to the first inner shell (4).

10. A rice milling method, according to the rice milling integrated drying waste heat recovery device of claim 1, characterized in that: The following processes are included: The spiral feeding mechanism (3) is driven by the driving mechanism (2) to spirally convey the milled rice to be processed into the diversion mechanism (7), and the pneumatic mechanism (5) is driven by the driving mechanism (2) to generate airflow and is heated by the heater (6), thereby drying the conveyed milled rice; The centrifugal force generated by the pneumatic mechanism (5) during the rotation process separates the rice grains from the rice husks and dust in the rice milling process. The separated rice grains fall into the first chamber (11) under the action of gravity and are collected. The separated rice husks and dust are introduced into the second chamber (12) through the diversion mechanism (7) for collection. The heat in the air flow in the diversion mechanism (7) is circulated and absorbed by the circulation condensation mechanism (8), and the air that is filtered, intercepted and heat-absorbed is discharged outside the box (1). The air guide pipe introduces the air outside the box (1) into the circulation condensation mechanism (8), and the air is preheated by the heat absorbed by the circulation condensation mechanism (8) and provided to the air inlet of the first inner shell (4), thereby realizing the recycling of heat.

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