Automatic feeding grain grinding device

Abstract

The present invention relates to the technical field of grain milling, and specifically to an automatic feeding grain milling device, comprising a base, an equipment frame and a milling case. A grinding barrel is provided in the milling case, and a driving assembly drives an operating assembly to perform grinding. A transmission box is provided on the side edge of the base, and grains are transported to the milling case through a screw feeder. A cooling unit is specially provided in the milling case frame, comprising a plurality of independent cooling parts provided on the outer wall of the grinding barrel to achieve primary cooling; and a secondary cold flow distributor installed at the output end of the grinding barrel to complete secondary rapid cooling through forced airflow. The two-stage cooling works synergistically to effectively inhibit grain coking. A material receiving frame and a filter bar are provided in the equipment frame to filter incompletely crushed particles for recirculation treatment. This device integrates automatic feeding, continuous milling and efficient cooling to ensure grain processing quality, prevent coking, retain nutrients and improve production efficiency.

Description

Technical Field

[0001] The invention relates to the technical field of grain milling, in particular to an automatic feeding grain milling device. Background Art

[0002] In the prior art, grain milling equipment typically consists of a feeding system, a grinding mechanism, and a sorting device. A spiral elevator transports grains into the grinding chamber, where they are crushed using rotating blades and a screen. A vibrating screen then separates substandard grains for return processing.

[0003] However, in actual operation, a severe temperature gradient exists within the grinding chamber. Measurements show that after two hours of continuous operation, the temperature in the grinding tooth area can reach 80-120°C. This can lead to the denaturation of the grain's nutrients, increased wear of metal components due to thermal expansion, and even carbonization and agglomeration of the material. This defect severely limits the efficiency of high-fiber grain processing and the long-term operational stability of the equipment. Summary of the Invention

[0004] The object of the present invention is to provide an automatic feeding grain grinding device to solve the problems raised in the above background technology.

[0005] To achieve the above object, the present invention provides the following technical solutions:

[0006] An automatic feeding grain grinding device comprises a base, an equipment frame mounted on the base, and a grinding machine box mounted on the equipment frame; the side edge of the base is provided with a side wing support frame and a transmission box mounted thereon, the transmission box has a built-in screw feeder and is driven by a variable frequency motor for conveying grains; the top of the transmission box is connected to a drop frame, the bottom of the drop frame is equipped with a vibration motor and is connected to the receiving hopper of the grinding machine box through a lower hopper to achieve continuous and stable supply of grains; the grinding machine box includes a grinding machine A box frame and a grinder barrel mounted therein, the output end of the receiving hopper is connected to the grinder barrel; a driving assembly is also provided in the grinding box frame, and an operating assembly is installed at its driving end, and the operating assembly extends into the barrel cavity of the grinder barrel to perform grain crushing; a discharge part is provided at the output end of the grinder barrel, and its bottom is connected to a discharge part; a receiving frame and a filter bar mounted thereon are provided in the equipment frame, the discharge part inputs the material into the receiving frame, and the filter bar is used to separate the incompletely crushed particles and return them to the transmission box for circulation treatment.

[0007] As a further solution of the present invention: a cooling unit is arranged in the grinding box frame, including: a plurality of independent cooling parts, which are sequentially mounted on the outer wall of the grinder barrel to achieve primary cooling through contact heat conduction; a secondary cold flow device, which is installed at the output end of the grinder barrel and connected to the discharge part, and completes secondary rapid cooling through forced airflow cooling; the cooling part and the secondary cold flow device work together to suppress grain coking.

[0008] As a further solution of the present invention: the material receiving hopper includes a material receiving end with a conical expansion, a double-layer conical material gathering part connected to the bottom thereof, and an inlet end that passes through the material gathering part, and the bottom of the material gathering part is externally connected to an auxiliary material pipeline.

[0009] As a further solution of the present invention: the operating component includes a crushing shaft installed on the crushing barrel through a fixed flange, the crushing shaft is driven by the driving component and passes through the barrel cavity of the crushing barrel, and is bidirectionally supported at both ends by bearing seats.

[0010] As a further solution of the present invention: spiral crushing blades with a helix angle of 45° are welded on the crushing shaft, and a plurality of integrated grinding sleeves are provided on the cylinder body of the crusher barrel. The inner wall of the grinding sleeve is provided with annular grinding teeth, forming a dynamic shear-extrusion composite crushing zone with the spiral crushing blades.

[0011] As a further solution of the present invention: the cooling part includes a cold flow machine, a closed sleeve fixed to the outer wall of the pulverizer barrel by locking bolts, and a heat conductive ring embedded in the inner wall of the closed sleeve.

[0012] As a further solution of the present invention: the inner wall of the heat-conducting ring is provided with a strip-shaped docking groove, which is coupled with the docking strip on the outer wall of the grinding sleeve to form a heat conduction interface.

[0013] As a further embodiment of the present invention, the airflow introduction tube of the secondary cold flow unit is connected to the pulverizer drum via a support flange. The airflow introduction tube is provided with a pressure regulating portion. The vent end of the airflow introduction tube is connected to the pulverizer drum via a filter. The support flange utilizes a double-layer fluororubber seal and is secured with high-strength bolts. The filter includes a stainless steel coarse filter layer, a glass fiber medium-efficiency filter layer, and a HEPA filter layer, arranged in sequence.

[0014] Compared with the prior art, the present invention has the following beneficial effects:

[0015] 1. Highly effective in preventing scorching and retaining nutrients:

[0016] The device incorporates a two-stage cooling system to prevent coking, including several independent cooling sections mounted on the outer wall of the mill barrel and a secondary cooling circulator at the discharge end. This dual protection mechanism of "barrel cooling + discharge quenching" ensures that the temperature remains below 45°C throughout the grinding process, significantly reducing the grain's coking rate and preserving its nutritional content, such as significantly reducing protein denaturation.

[0017] 2. Fine grinding and uniform fineness:

[0018] The spiral crushing blades in the working component and the grinding sleeve on the crusher barrel form a dynamic shear-extrusion composite crushing zone, which cuts the grain fibers through relative movement. At the same time, the radial centrifugal force generated by the spiral angle enhances the contact frequency between the material and the grinding tooth patterns, thereby achieving fine crushing of the grains and uniformity of the powder fineness.

[0019] 3. Modular design and easy maintenance:

[0020] The cooling unit features a modular design, corresponding to the grinding sleeve for easy positioning and installation. The physical coupling of the heat transfer ring to the grinding sleeve, along with the precise fit of the docking strips and grooves, ensures efficient heat transfer while preventing the cooling medium from entering the grinding chamber. Furthermore, the use of locking bolts significantly reduces assembly and disassembly time, facilitating grinding sleeve maintenance and heat transfer ring replacement.

[0021] It should be understood that the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] The accompanying drawings are incorporated into and constitute a part of the specification to illustrate embodiments consistent with the present application and, together with the specification, serve to explain the principles of the present application. These drawings and the accompanying description are not intended to limit the scope of the present application in any way, but rather to illustrate the concepts of the present application to those skilled in the art by reference to specific embodiments.

[0023] Figure 1 This is a schematic diagram of the overall structure of the automatic loading grain grinding device provided in an embodiment of the present invention.

[0024] Figure 2 A schematic diagram of the internal structure of a grinding machine box provided in an embodiment of the present invention.

[0025] Figure 3 A schematic structural diagram of a receiving hopper provided in an embodiment of the present invention.

[0026] Figure 4 A schematic diagram of the internal structure of a pulverizer barrel provided in an embodiment of the present invention.

[0027] Figure 5 A schematic structural diagram of a cooling unit provided in an embodiment of the present invention.

[0028] Figure 6 For the present invention Figure 4 Schematic diagram of the structure of area A in the middle.

[0029] Figure 7 A schematic structural diagram of a secondary cold flow transmitter provided in an embodiment of the present invention.

[0030] In the figure: 1. Base; 2. Equipment frame; 3. Grinding box; 4. Receiving hopper; 5. Side support frame; 6. Transfer box; 7. Drop frame; 8. Lower hopper; 21. Receiving frame; 22. Filter bar; 31. Grinding box frame; 32. Crusher barrel; 321. Grinding sleeve; 322. Grinding teeth; 323. Docking bar; 33. Drive assembly; 331. Fixing block; 332. Drive; 34. Operating assembly; 341. Fixing flange; 342. Positioning bolt; 343. Crushing shaft; 344. Spiral crushing blade; 35. Discharging 36. Feeding section; 37. Cooling section; 371. Cold flow machine; 372. Heat exchange channel; 373. Closing sleeve; 374. Locking bolt; 375. Channel in barrel; 376. Heat transfer ring; 377. Strip-shaped docking groove; 378. Air vent; 379. Fixed bolt; 38. Secondary cold flow distributor; 381. Air flow introduction tube; 382. Support flange; 383. Air connection end; 384. Air pressure regulating section; 385. Filter section; 41. Feeding end; 42. Material gathering section; 43. Inlet end; 44. Auxiliary material pipeline. DETAILED DESCRIPTION

[0031] The following will be combined with the accompanying drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention, and examples thereof are shown in the accompanying drawings. When the following description refers to the drawings, unless otherwise indicated, the same numbers in different drawings represent the same or similar elements.

[0032] Obviously, the embodiments described are only some of the embodiments of the present invention, not all of them. 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.

[0033] The specific implementation of the present invention is described in detail below with reference to specific embodiments.

[0034] For example 1, please refer to Figure 1 and Figure 2, provides an automatic loading grain grinding device, including a base 1, an equipment frame 2 mounted on the base 1 and a grinding machine box 3 installed on the equipment frame 2, the side edge of the base 1 is provided with a side wing support frame 5 and a transmission box 6 mounted on the side wing support frame 5, the top of the transmission box 6 is provided with a drop frame 7, the feeding end of the grinding machine box 3 is provided with a receiving hopper 4, the bottom of the dropping frame 7 is connected to the receiving hopper 4 through a lower hopper 8; the grinding machine box 3 includes a The equipment frame 2 includes a milling box frame 31 and a grinding barrel 32 mounted within the milling box frame 31. The output end of the receiving hopper 4 is connected to the grinding barrel 32. A drive assembly 33 is also mounted within the milling box frame 31. An operating assembly 34 is mounted on the driving end of the drive assembly 33. The operating assembly 34 extends into the barrel cavity of the grinding barrel 32 at one end. A discharge portion 35 is provided at the output end of the grinding barrel 32, and a discharge portion 36 is mounted at the bottom of the discharge portion 35. A receiving frame 21 and a filter bar 22 mounted on the receiving frame 21 are provided within the equipment frame 2. The discharge portion 36 is fed into the receiving frame 21. The receiving frame 21 separates the grains through the filter bar 22 and returns the incompletely ground grains to the transfer box 6.

[0035] A cooling unit is also provided in the grinding box frame 31, and the cooling unit includes several independent cooling parts 37, which are sequentially sleeved on the outer periphery of the cylinder of the grinder barrel 32; a secondary cold flow device 38 is also installed at the other end of the grinder barrel 32, and the output end of the secondary cold flow device 38 is connected to the discharge part 35.

[0036] In this embodiment, the transfer box 6 houses a built-in screw feeder (0.5-1.5 kW), driven by a variable-frequency motor, which delivers grain to the drop frame 7 at a rate of 5-15 kg / min. A vibration motor (30-50 Hz) is installed at the bottom of the drop frame 7. By adjusting the amplitude, the grain is evenly distributed into the drop hopper 8, preventing accumulation and blockage. The drop hopper 8 precisely docks with the receiving hopper 4 of the milling machine 3, ensuring a continuous and stable supply of grain and eliminating manual intervention.

[0037] During the grinding stage, the drive assembly 33 drives the operating assembly 34 to rotate at high speed, repeatedly impacting and shearing the grains within the grinding barrel 32, completing multi-stage grinding. To prevent grain from coking during grain grinding, this embodiment is designed with two levels of anti-coking cooling measures:

[0038] Primary cooling: Several independent cooling sections 37 are mounted on the outer wall of the mill barrel 32 to reduce the barrel temperature through contact heat conduction, thereby suppressing the heat generated by grinding friction.

[0039] Secondary cooling: The secondary cooling device 38 at the discharge end forces the crushed material to cool down to avoid coking due to residual heat during discharge.

[0040] The ground material falls through the discharge section 36 into the receiving frame 21. A filter screen 22 (a vibrating screen or multi-layer aperture grid) separates the powder from substandard particles. Incompletely ground particles slide through the inclined surface of the filter screen 22 to the bottom of the transfer box 6, where they are re-entered by a lifting device (such as a screw conveyor) to complete the closed-loop process.

[0041] This embodiment effectively prevents coking. The cooling section 37 and the secondary cold flow channel 38 provide dual protection: "barrel cooling + discharge quenching." This ensures a temperature of ≤45°C throughout the milling process, closes the grain coking rate to zero, and preserves nutrients (protein denaturation is reduced by 60%). Furthermore, multi-stage cooling prevents grain hardening caused by high temperatures, ensuring uniform powder fineness after grinding, meeting high-precision processing requirements. Each independent cooling section 37 can be activated on demand, reducing energy consumption.

[0042] Example 2: Based on the above example, please refer to Figure 2 and Figure 3 Regarding the specific implementation structure of the receiving hopper 4, this embodiment is designed as follows:

[0043] The material receiving hopper 4 includes a material receiving end 41 , a material gathering portion 42 disposed at the bottom of the material receiving end 41 , and an inlet end 43 installed at the bottom of the material gathering portion 42 . An auxiliary material pipeline 44 is externally connected to the bottom of the material gathering portion 42 .

[0044] The material receiving end 41 features a tapered flared design with a PTFE lining on the inner wall. This reduces friction between the material and the hopper wall, minimizing grain adhesion and residue. The material collecting section 42 is a double-layered conical cavity, with a stainless steel outer shell and an inner PTFE liner. This uses a stepped contraction pattern to achieve material collection and pre-compression. The auxiliary material pipeline 44 can be connected to an external storage tank or filling device to facilitate the injection of auxiliary materials such as lubricants, anti-sticking agents, or antioxidants during equipment downtime for maintenance.

[0045] Example 3, based on the content of the above example, please refer to Figure 2 and Figure 4 Regarding the specific implementation structure of the grinding operation, this embodiment is designed as follows:

[0046] The operating component 34 includes a fixed flange 341 installed on the grinder barrel 32 and a grinder shaft 343 installed in the fixed flange 341. The grinder shaft 343 passes through the barrel cavity of the grinder barrel 32. The driving component 33 includes a fixed block 331 and a driver 332 installed on the fixed block 331. The grinder shaft 343 is installed at the driving end of the fixed block 331.

[0047] The pulverizing shaft 343 is provided with spiral pulverizing blades 344 , and the body of the pulverizer barrel 32 is provided with a plurality of grinding sleeves 321 . The grinding sleeves 321 and the barrel wall of the pulverizer barrel 32 are an integrated structure, and the inner sleeve surface of the grinding sleeve 321 is provided with an annularly arranged grinding tooth pattern 322 .

[0048] The fixed block 331 of the drive assembly 33 is secured to the mill frame 31 with high-strength bolts. The output shaft of the driver 332 (using a variable-frequency motor) is rigidly connected to the grinding shaft 343 via a coupling, ensuring stable torque transmission. The grinding shaft 343 is bidirectionally supported at both ends by the fixing flange 341 and the bearing seat of the grinding barrel 32. Axial runout is ≤0.05mm, preventing resonance during high-speed rotation.

[0049] The spiral pulverizing blades 344 are continuous spiral blades with a 45° helix angle welded to the pulverizing shaft 343. The clearance between the blade's outer edge and the inner wall of the pulverizer barrel 32 is controlled at 1-2 mm, enabling material propulsion and initial shearing and crushing. The grinding sleeve 321 and the spiral pulverizing blades 344 form a dynamic shear-compression composite pulverizing zone. The sharp tips of the grinding teeth 322 form a shear surface with the outer edge of the spiral blades, severing grain fibers through relative motion. Simultaneously, the rotation of the spiral pulverizing blades 344 generates axial thrust, continuously moving the material toward the discharge section 35 and preventing localized accumulation. The designed helix angle simultaneously subjects the material to radial centrifugal force, increasing the frequency of contact with the grinding teeth 322.

[0050] Example 4: Based on the above examples, please refer to Figure 3 、 Figure 4 、 Figure 5 and Figure 6 Regarding the specific implementation structure of the cooling unit 37, this embodiment is designed as follows:

[0051] The cooling portion 37 is matched with the grinding sleeve 321 in a one-to-one manner and is disposed at the location of the corresponding grinding sleeve 321;

[0052] The cooling part 37 includes a cold flow machine 371, a closing sleeve 373 and a heat-conducting ring 376. Two closing sleeves 373 are provided and fixed by a locking bolt 374. The upper and lower closing sleeves 373 are combined into a barrel inner passage 375. The closing sleeve 373 is installed on the outer wall of the tube body of the grinding barrel 32 and makes the grinding sleeve 321 located in the inner section of the corresponding barrel inner passage 375. The heat-conducting ring 376 is loaded in the barrel inner passage 375 and is sleeved on the outer periphery of the corresponding grinding sleeve 321.

[0053] The closing sleeve 373 is provided with a fixed row of bolts 379, and the thermal conductive ring 376 is fixedly installed on the fixed row of bolts 379 through a locking bolt. The outer wall of the grinding tooth pattern 322 is provided with a ring-shaped docking strip 323, and the inner wall of the thermal conductive ring 376 is provided with a strip-shaped docking groove 377 that matches the docking strip 323.

[0054] A heat exchange channel 372 is installed on the cold flow machine 371 , and the heat exchange channel 372 is communicated with the inner passage 375 of the barrel. A vent 378 is provided on the outer wall of the closing sleeve 373 .

[0055] This embodiment designs a modular cooling unit, in which the cooling portion 37 corresponds one-to-one with the grinding sleeve 321. A positioning pin is used to ensure that the barrel passage 375 of the closing sleeve 373 coincides with the axis of the grinding sleeve 321, thereby achieving cooling area coverage. The upper and lower closing sleeves 373 are fixed by locking bolts 374, and the docking strips 323 on the outer wall of the grinding teeth 322 are embedded in the strip-shaped docking grooves 377 on the inner wall of the heat conducting ring 376, forming an efficient heat conduction interface. The cold flow machine 371 is a scroll compressor that outputs the cooling medium to the heat exchange channel 372. The cooling medium is an ethylene glycol solution at a temperature of -10°C to 15°C. The heat exchange channel 372 is a stainless steel spiral coil with a wall thickness of 2mm and a controllable flow range of 5-30L / min.

[0056] The barrel inner passage 375 is sealed and connected to the heat exchange passage 372 through a flange, and the cooling medium forms turbulent flow (Reynolds number > 4000) in the passage, thereby improving the heat dissipation efficiency.

[0057] During the grinding process, frictional heat between the grinding teeth 322 and the material (local temperatures can reach 120°C) is transferred to the heat transfer ring 376 via the butt joint strip 323. The copper-aluminum alloy material rapidly dissipates the heat across the entire surface of the heat transfer ring. The low-temperature ethylene glycol solution pumped into the heat exchange channel 372 by the cold flow machine 371 flows at high speed, exchanging heat with the heat transfer ring 376 through the tube wall, removing the heat from the system with a temperature difference efficiency exceeding 85%. The joint between the closing sleeve 373 and the grinding barrel 32 utilizes a graphite spiral wound gasket (temperature resistant from -200°C to 600°C). Combined with the uniform preload of the locking bolt 374, this ensures zero coolant leakage. The precise fit between the heat transfer ring 376 and the butt joint strip 323 ensures efficient heat transfer while preventing the cooling medium from entering the grinding chamber. The locking bolts 374 are fixed with M12 bolts (pre-tightening force 80 N·m), and the disassembly and assembly time is less than 10 minutes, which is convenient for maintaining the grinding sleeve 321 or replacing the heat conducting ring 376.

[0058] In the test of continuous grinding of soybeans (oil content 18%) in this embodiment, the cooling unit 37 controlled the grinding sleeve temperature at 65°C, no oil carbonization occurred, and the peroxide value of the finished product was reduced by 30%;

[0059] Example 5, based on the content of the above embodiment, please refer to Figure 2 and Figure 7 Regarding the specific implementation structure of the secondary cold flow channel 38, this embodiment is designed as follows:

[0060] The main body of the secondary cold flow device 38 is an air flow introduction tube 381, one end of the air flow introduction tube 381 is fixedly installed with the grinder barrel 32 through a support flange 382, ​​and the other end of the air flow introduction tube 381 is connected to the air receiving end 383. The air flow introduction tube 381 is provided with a pressure regulating part 384, and the ventilation end of the air flow introduction tube 381 is connected to the grinder barrel 32 through the filter part 385.

[0061] The support flange 382 uses a double-layer sealing ring and is fixed to the grinder barrel 32 with high-strength bolts to ensure that the airflow path is leak-free. The cylinder body of the airflow inlet cylinder 381 is made of 304 stainless steel. The air pressure regulation unit 384 integrates a PID control algorithm and drives the butterfly valve through a stepper motor to achieve an air pressure adjustment range of 0-50kPa, which is suitable for different material cooling requirements (such as low-pressure cooling for grain grinding and high-pressure dust suppression for oily materials). For low-temperature brittle materials, the air pressure is set to 15kPa and the cold air flow temperature is -10°C to avoid softening and adhesion of the material; for high-fat materials, the air pressure is set to 40kPa and the cold air flow temperature is set to 5°C to inhibit oil oxidation and reduce the risk of dust explosion.

[0062] The filter section 385 includes three filter layers: a coarse filter layer (stainless steel woven mesh, 1mm pore size) to intercept large impurities; a medium-efficiency filter layer (glass fiber, filtration efficiency ≥95% @ 5μm); and a HEPA filter layer (filtration efficiency ≥99.97% @ 0.3μm) to prevent fine powder from entering the cold flow duct and causing blockage. The air inlet 383 is connected to an external cooling source (such as a vortex refrigeration unit). When the cold air flows through the air inlet tube 381, it is formed into a spiral flow by the guide plates inside the tube (inclination angle 45°, spacing 80mm), improving the uniformity of heat exchange with the pulverized material.

[0063] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above and that the invention can be embodied in other specific forms without departing from the spirit or essential characteristics of the invention. Therefore, the embodiments should be considered in all respects as illustrative and non-restrictive, and the scope of the invention is defined by the appended claims rather than the foregoing description, and it is intended that all variations that come within the meaning and range of equivalents of the claims be embraced therein.

[0064] In addition, it should be understood that although this specification is described in terms of implementation methods, not every implementation method contains only one independent technical solution. This narrative method of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment can also be appropriately combined to form other implementation methods that can be understood by those skilled in the art.

Claims

1. An automatic feeding grain grinding device, comprising a base, an equipment frame mounted on the base, and a grinding machine box mounted on the equipment frame, characterized in that: The side edge of the base is provided with a side wing support frame and a transmission box mounted thereon, the transmission box has a built-in screw feeder and is driven by a variable frequency motor for conveying grains; The top of the transmission box is connected to the drop frame, the bottom of the drop frame is equipped with a vibration motor and is connected to the receiving hopper of the grinding machine box through the lower hopper; The grinding machine box includes a grinding box frame and a grinding barrel mounted therein, and the output end of the hopper is connected to the grinding barrel; A driving assembly is also provided in the grinding box frame, and an operating assembly is installed at the driving end thereof, and the operating assembly extends into the barrel cavity of the grinder barrel to perform grain grinding; The output end of the pulverizer barrel is provided with a discharging portion, the bottom of which is connected to the feeding portion; The equipment frame is provided with a receiving frame and a filter bar mounted thereon. The material is fed into the receiving frame by the unloading part, and the filter bar is used to separate the incompletely crushed particles and return them to the transfer box for recycling. A cooling unit is provided in the grinding box frame, including: Several independent cooling parts are sequentially sleeved on the outer wall of the pulverizer barrel to achieve primary cooling through contact heat conduction; The secondary cooling device is installed at the output end of the crusher barrel and connected to the discharge part, completing the secondary cooling through air flow cooling; The operating assembly includes a pulverizing shaft mounted on the pulverizer barrel via a fixed flange. The pulverizing shaft is driven by the driving assembly and passes through the barrel cavity of the pulverizer barrel, and is supported in both directions by bearing seats at both ends. The pulverizing shaft is welded with spiral pulverizing blades with a helical angle of 100°. The barrel of the pulverizer is provided with a plurality of grinding sleeves. The grinding sleeves and the barrel wall of the pulverizer are an integrated structure. The inner wall of the grinding sleeve is provided with an annular grinding tooth pattern, which forms a dynamic shear-extrusion composite pulverizing zone with the spiral pulverizing blades. The cooling part corresponds to the grinding sleeve one by one.

2. The automatic feeding grain milling device according to claim 1, characterized in that: The material receiving hopper comprises a material receiving end with a conical expansion, a double-layer conical material gathering part connected to the bottom thereof, and an inlet end penetrating the material gathering part. The bottom of the material gathering part is externally connected to an auxiliary material pipeline.

3. The automatic feeding grain milling device according to claim 1, characterized in that: The cooling part includes a cold flow machine, a closed sleeve fixed to the outer wall of the crusher barrel through a locking bolt, and a heat conducting ring embedded in the inner wall of the closed sleeve.

4. The automatic feeding grain milling device according to claim 3, characterized in that: The inner wall of the heat-conducting ring is provided with a strip-shaped docking groove, which is coupled with the docking strip on the outer wall of the grinding sleeve to form a heat conduction interface; the cold flow machine transports the cooling medium to the closed sleeve through the heat exchange channel.

5. The automatic feeding grain milling device according to claim 1, characterized in that: The air flow introduction tube of the secondary cold flow device is connected to the crusher tube through a supporting flange, and the supporting flange adopts a double-layer fluororubber sealing ring and is fixed by high-strength bolts; The air flow introduction tube is provided with an air pressure regulating part, and the ventilation end of the air flow introduction tube is connected to the pulverizer tube through the filter part; The air pressure regulating unit integrates PID control algorithm and drives the butterfly valve through a stepper motor to achieve an air pressure regulation range of 0-50kPa; The filter part includes a stainless steel coarse filter layer, a glass fiber medium-efficiency filter layer and a HEPA filter layer which are arranged in sequence.

Images