Automatic feeding grain grinding device

Abstract

The invention relates to the technical field of grain grinding, in particular to an automatic feeding grain grinding device which comprises a base, an equipment frame and a grinding machine box. A crushing machine cylinder is arranged in the grinding machine box, and the driving assembly drives the operation assembly to conduct crushing. A conveying box is arranged on the side edge of the base, and grains are conveyed to the grinding machine box through a spiral feeder. A cooling unit is specially arranged in the grinding box frame and comprises a plurality of independent cooling parts arranged on the outer wall of the grinder cylinder in a sleeving manner, so that primary cooling is realized; and the second-stage cold circulation device is arranged at the output end of the crushing machine barrel and is used for completing second-stage quenching through forced airflow. The two-stage cooling synergistic effect effectively inhibits grain coking. A material receiving frame and a filtering fence are arranged in the equipment frame, and particles which are not completely crushed are filtered and subjected to backflow circulation treatment. The device integrates automatic feeding, continuous grinding and efficient cooling, the grain processing quality is ensured, coking is prevented, nutritional ingredients are reserved, and the production efficiency is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of grain milling, and specifically, it is an automatic feeding grain milling device. Background Art

[0002] In the prior art, grain milling equipment usually consists of a feeding system, a milling mechanism, and a sorting device. It transports grains to the milling chamber through a screw elevator, realizes pulverization by the cooperation of rotating blades and a screen mesh, and uses vibration screening to select unqualified particles for reflux treatment.

[0003] However, during actual operation, there is a significant temperature gradient in the milling chamber. Measured data shows that after the equipment runs continuously for 2 hours, the temperature in the area of the grinding tooth pattern can reach 80 - 120 °C, resulting in the denaturation of the nutritional components of the grains, increased thermal expansion and wear of metal components, and even the carbonization and caking of the materials. This defect seriously limits the processing efficiency of high-fiber grains and the long-term operation stability of the equipment. Summary of the Invention

[0004] The purpose of the present invention is to provide an automatic feeding grain milling device to solve the problems raised in the above background art.

[0005] To achieve the above purpose, the present invention provides the following technical solution: An automatic feeding grain milling device includes a base, an equipment frame erected on the base, and a milling machine box installed on the equipment frame; a wing support frame is arranged on the side edge of the base and a transmission box is erected on it. The transmission box is internally provided with a screw feeder and is driven by a frequency conversion motor for transporting grains; the top end of the transmission box is connected to a falling frame. A vibration motor is installed at the bottom of the falling frame and is docked with the receiving hopper of the milling machine box through a feeding hopper to achieve continuous and stable supply of grains; the milling machine box includes a milling box frame and a pulverizer cylinder erected inside it. The output end of the receiving hopper is connected to the pulverizer cylinder; a driving component is also arranged inside the milling box frame, and an operating component is installed at its driving end. The operating component extends into the cylinder cavity of the pulverizer cylinder to perform grain pulverization; the output end of the pulverizer cylinder is provided with a discharging part, and its bottom is connected to a feeding part; a receiving frame and a filtering grid erected on it are arranged inside the equipment frame. The feeding part inputs materials into the receiving frame, and the filtering grid is used to separate incompletely pulverized particles and make them reflux to the transmission box for circular processing.

[0006] As a further solution of the present invention: a cooling unit is arranged inside the milling box frame, including: several independent cooling parts, which are sequentially sleeved on the outer wall of the pulverizer cylinder to achieve primary cooling through contact heat conduction; a secondary cold flow circulator, which is installed at the output end of the pulverizer cylinder and is connected to the discharging part, and completes secondary rapid cooling through forced air cooling; the cooling parts and the secondary cold flow circulator cooperate to inhibit grain coking.

[0007] As a further solution of the present invention: the material receiving hopper includes a material receiving end with a conical flare, a double-layer conical material collecting part connected to its bottom, and an inlet end penetrating the material collecting part, and the bottom of the material collecting part is externally connected to an auxiliary material pipeline.

[0008] As a further solution of the present invention: the operating assembly includes a crushing shaft installed on the crusher cylinder through a fixed flange, the crushing shaft is driven by a driving assembly and penetrates the cylinder cavity of the crusher cylinder, and both ends are bidirectionally supported by bearing seats.

[0009] As a further solution of the present invention: spiral crushing blades with a spiral angle of 45° are welded on the crushing shaft, and a number of integrated grinding sleeves are provided on the cylinder body of the crusher cylinder, and annular grinding tooth patterns are provided on the inner wall of the grinding sleeve, forming a dynamic shear-extrusion composite crushing area with the spiral crushing blades.

[0010] As a further solution of the present invention: the cooling part includes a cold flow machine, a closing sleeve fixed to the outer wall of the crusher cylinder through a locking bolt, and a heat conduction ring embedded in the inner wall of the closing sleeve.

[0011] As a further solution of the present invention: strip-shaped docking grooves are provided on the inner wall of the heat conduction ring, which are coupled with the docking strips on the outer wall of the grinding sleeve to form a heat conduction interface.

[0012] As a further solution of the present invention: the air flow inlet cylinder of the secondary cold flow device is connected to the crusher cylinder through a support flange, a pressure air regulating part is provided on the air flow inlet cylinder, the air inlet end of the air flow inlet cylinder is docked with the crusher cylinder through a filtering part, and the support flange uses a double-layer fluororubber sealing ring and is fixed by high-strength bolts. The filtering part includes a stainless steel coarse filter layer, a fiberglass medium-effect filter layer and a HEPA filter layer arranged in sequence.

[0013] Compared with the prior art, the beneficial effects of the present invention are: 1. High-efficiency anti-coking and retention of nutritional components: The device is designed with two-stage anti-coking cooling measures, including a number of independent cooling parts sleeved on the outer wall of the crusher cylinder and a secondary cold flow device at the discharge end. This dual protection mechanism of "cylinder body cooling + discharge end rapid cooling" ensures that the temperature during the entire grinding process is controlled below 45°C, greatly reducing the coking rate of grains and retaining the nutritional components of grains, such as the protein denaturation rate is significantly reduced.

[0014] 2. Fine crushing and uniform fineness: The spiral crushing blades in the operating assembly and the grinding sleeves on the crusher cylinder form a dynamic shear-extrusion composite crushing area. The relative movement cuts the grain fibers, and 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 realizing the fine crushing of grains and the uniformity of the powder fineness.

[0015] III. Modular Design and Easy Maintenance: The cooling part adopts a modular design, corresponding one-to-one with the grinding sleeve, which is convenient for positioning and installation. The physical coupling between the heat conduction ring and the grinding sleeve and the precise fit between the docking strip and the strip-shaped docking groove not only ensure the heat conduction efficiency but also prevent the cooling medium from seeping into the grinding chamber. In addition, the adoption of the locking bolts greatly shortens the disassembly and assembly time, facilitating the maintenance of the grinding sleeve or the replacement of the heat conduction ring.

[0016] It should be understood that the above general description and the following detailed description are only exemplary and explanatory, and cannot limit this application. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The drawings herein are incorporated into the specification and form a part of this specification, showing the embodiments consistent with this application, and are used together with the specification to explain the principles of this application. At the same time, these drawings and the text description are not intended to limit the scope of the concept of this application in any way, but to illustrate the concept of this application to those skilled in the art by referring to specific embodiments.

[0018] Figure 1 It is a schematic diagram of the overall structure of the automatic feeding grain milling device provided by the embodiment of the present invention.

[0019] Figure 2 It is a schematic diagram of the internal structure of the milling machine box provided by the embodiment of the present invention.

[0020] Figure 3 It is a schematic diagram of the structure of the feeding hopper provided by the embodiment of the present invention.

[0021] Figure 4 It is a schematic diagram of the internal structure of the pulverizer cylinder provided by the embodiment of the present invention.

[0022] Figure 5 It is a schematic diagram of the structure of the cooling part provided by the embodiment of the present invention.

[0023] Figure 6 For the present invention Figure 4 a schematic diagram of the structure of area A therein.

[0024] Figure 7 It is a schematic diagram of the structure of the secondary cold flow-through device provided by the embodiment of the present invention.

[0025] In the figure: 1, base; 2, equipment frame; 3, grinding machine case; 4, material receiving hopper; 5, side wing support frame; 6, transmission box; 7, falling frame; 8, blanking hopper; 21, material receiving frame; 22, filter bar; 31, grinding box frame; 32, crusher cylinder; 321, grinding sleeve; 322, grinding tooth pattern; 323, docking strip; 33, drive assembly; 331, fixed block; 332, driver; 34, operation assembly; 341, fixed flange; 342, positioning bolt; 343, crushing shaft; 344, spiral crushing blade; 35, discharging part; 36, blanking part; 37, cooling part; 371, cold flow machine; 372, heat exchange channel; 373, closing sleeve; 374, locking row bolt; 375, inner barrel through channel; 376, heat conducting ring; 377, strip-shaped docking groove; 378, ventilation port; 379, fixed row bolt; 38, secondary cold flow device; 381, air flow introduction cylinder; 382, support flange; 383, air receiving end; 384, air pressure regulating part; 385, filtering part; 41, material receiving end; 42, material gathering part; 43, access end; 44, auxiliary material pipeline. Detailed implementation mode

[0026] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention, and the examples are shown in the drawings. When the following description refers to the drawings, unless otherwise indicated, the same numbers in different drawings represent the same or similar elements.

[0027] Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0028] The following will describe in detail the specific implementation of the present invention with reference to specific embodiments.

[0029] Example 1, please refer to Figure 1 and Figure 2, provides an automatic feeding grain milling device, comprising a base 1, an equipment frame 2 mounted on the base 1, and a milling 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 milling 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 milling machine box 3 includes a The milling box frame 31 includes a milling box frame 31 and a crushing barrel 32 mounted in the milling box frame 31. The output end of the receiving hopper 4 is connected to the crushing barrel 32. A driving assembly 33 is also mounted in the milling box frame 31. The driving end of the driving assembly 33 is installed with an operating assembly 34. The operating assembly 34 extends into the barrel cavity of the crushing barrel 32 at one end of the crushing barrel 32. A discharge portion 35 is provided at the output end of the crushing barrel 32. A discharge portion 36 is installed 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 in the equipment frame 2. The discharge portion 36 is input into the receiving frame 21. The receiving frame 21 separates grains through the filter bar 22, and returns the grains that are not completely crushed to the transmission box 6.

[0030] A cooling unit is also provided in the grinding box frame 31, and the cooling unit includes a plurality of independent cooling parts 37, and the cooling parts 37 are sequentially sleeved on the outer periphery of the cylinder body of the grinder cylinder 32; a secondary cold flow transmitter 38 is also installed at the other end of the grinder cylinder 32, and the output end of the secondary cold flow transmitter 38 is connected to the discharge part 35.

[0031] In this embodiment, the transmission box 6 is equipped with a spiral feeder (power 0.5-1.5 kW), which is driven by a variable frequency motor to transport grains to the drop frame 7 at a rate of 5-15 kg / min. A vibration motor (frequency 30-50 Hz) is installed at the bottom of the drop frame 7, and the amplitude is adjusted to ensure that the grains enter the lower hopper 8 evenly to avoid accumulation and blockage. The lower hopper 8 is precisely docked with the receiving hopper 4 of the mill box 3 to achieve continuous and stable supply of grains and avoid manual intervention.

[0032] In the crushing stage, the driving assembly 33 drives the working assembly 34 to rotate at high speed, repeatedly impacting and shearing the grains in the crushing barrel 32, and completing multi-stage crushing. In order to prevent the grains from coking during grain grinding, this embodiment is designed with two levels of anti-coking cooling measures: Primary cooling: A number of independent cooling parts 37 are mounted on the outer wall of the mill barrel 32 to reduce the barrel temperature through contact heat conduction and suppress the heat generated by grinding friction.

[0033] 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.

[0034] The milled material falls into the material receiving frame 21 through the blanking part 36, and the filtering bar 22 (vibrating screen or multi-layer aperture grid) separates the powder from the unqualified particles. The incompletely crushed particles slide down the inclined surface of the filtering bar 22 into the bottom of the transmission box 6 and re-enter the milling process through a lifting device (such as a screw conveyor), forming a closed-loop processing.

[0035] This embodiment can efficiently prevent coking. The cooling part 37 and the secondary cold flow device 38 form a double protection of "cylinder cooling + rapid cooling of the discharged material", ensuring that the temperature throughout the milling process is ≤ 45 °C, the coking rate of the grains approaches 0, and the nutritional components are retained (the protein denaturation rate is reduced by 60%). And multi-stage cooling avoids the hardening of grains caused by high temperature, and the fineness of the powder after crushing is uniform, meeting the requirements of high-precision processing. Each independent cooling part 37 can be started in zones as needed, reducing energy consumption.

[0036] Embodiment 2, based on the content described in the above embodiment, please refer to Figure 2 and Figure 3 , for the specific implementation structure of the material receiving hopper 4, this embodiment is designed as follows: The material receiving hopper 4 includes a material receiving end 41, a material gathering part 42 arranged at the bottom of the material receiving end 41, and a feeding end 43 installed at the bottom end of the material gathering part 42. An auxiliary material pipeline 44 is externally connected to the bottom of the material gathering part 42.

[0037] The material receiving end 41 adopts a conical flared design, and the inner wall is covered with a polytetrafluoroethylene lining plate, which reduces the friction resistance between the material and the hopper wall and reduces the adhesion and residue of grains. The material gathering part 42 is a double-layer conical cavity, with a stainless steel shell on the outer layer and a polytetrafluoroethylene lining sleeve embedded in the inner layer, realizing material aggregation and pre-compression through stepped contraction. The auxiliary material pipeline 44 can be externally connected to a storage tank or a filling device, and auxiliary materials such as lubricating oil, anti-sticking agent, or antioxidant can be injected during equipment shutdown and maintenance to maintain the equipment.

[0038] Embodiment 3, based on the content described in the above embodiment, please refer to Figure 2 and Figure 4 , for the specific implementation structure of the milling operation, this embodiment is designed as follows: The operation component 34 includes a fixed flange 341 installed on the crusher cylinder 32 and a crushing shaft 343 installed inside the fixed flange 341. The crushing shaft 343 passes through the cylinder cavity of the crusher cylinder 32. The drive component 33 includes a fixed block 331 and a driver 332 installed on the fixed block 331. The crushing shaft 343 is installed at the drive end of the fixed block 331.

[0039] A spiral crushing blade 344 is installed on the crushing shaft 343. A number of grinding sleeves 321 are provided on the cylinder wall of the crusher cylinder 32. The grinding sleeves 321 and the cylinder wall of the crusher cylinder 32 are of an integrated structure. Annularly arranged grinding teeth 322 are provided on the inner sleeve surface of the grinding sleeves 321.

[0040] The fixing block 331 of the drive assembly 33 is fixed to the grinding box frame 31 by high-strength bolts. The output shaft of the driver 332 (using a variable-frequency motor) is rigidly connected to the crushing shaft 343 through a coupling to ensure stable torque transmission. Both ends of the crushing shaft 343 are supported bidirectionally through fixed flanges 341 and bearing seats of the crusher cylinder 32, and the axial runout is ≤0.05 mm to avoid resonance during high-speed rotation.

[0041] The spiral crushing blade 344 is a continuous spiral blade welded on the crushing shaft 343 with a spiral angle of 45°. The gap between the outer edge of the blade and the inner wall of the crusher cylinder 32 is controlled within 1-2 mm to achieve material propulsion and preliminary shear crushing. The grinding sleeve 321 and the spiral crushing blade 344 form a dynamic shear-extrusion composite crushing area. The sharp tips of the grinding teeth 322 and the outer edge of the spiral blade form a shear surface, and the cereal fibers are cut through relative movement. At the same time, the rotation of the spiral crushing blade 344 generates an axial thrust, causing the material to continuously move towards the discharge part 35 to avoid local accumulation. The spiral angle design enables the material to be simultaneously affected by the radial centrifugal force, enhancing the contact frequency with the grinding teeth 322.

[0042] Example 4. Based on the content described in the above example, please refer to Figure 3 、 Figure 4 、 Figure 5 and Figure 6 , for the specific implementation structure of the cooling part 37, this example is designed as follows: The cooling part 37 is in one-to-one correspondence with the grinding sleeve 321 and is arranged at the position where the corresponding grinding sleeve 321 is located; The cooling part 37 includes a cold flow machine 371, a closing sleeve 373, and a heat conduction ring 376. There are two closing sleeves 373, which are fixed by locking bolts 374. The upper and lower closing sleeves 373 are combined into an inner barrel through-channel 375. The closing sleeve 373 is installed on the outer wall of the pipe of the crusher cylinder 32, and the grinding sleeve 321 is located in the inner interval of the corresponding inner barrel through-channel 375. The heat conduction ring 376 is loaded in the inner barrel through-channel 375 and sleeved around the corresponding grinding sleeve 321.

[0043] A fixed bolt 379 is provided on the closing sleeve 373. The heat-conducting ring 376 is fixedly installed on the fixed bolt 379 through a locking bolt. An annularly arranged docking strip 323 is provided on the outer wall of the grinding tooth pattern 322, and a strip-shaped docking groove 377 that matches the docking strip 323 is provided on the inner wall of the heat-conducting ring 376.

[0044] A heat exchange channel 372 is installed on the cold flow machine 371. The heat exchange channel 372 is communicated with the inner barrel through-channel 375. An air vent 378 is provided on the outer wall of the closing sleeve 373.

[0045] This embodiment designs a modular cooling unit. The cooling part 37 corresponds to the grinding sleeve 321 one by one. The inner barrel through-channel 375 of the closing sleeve 373 is ensured to coincide with the axis of the grinding sleeve 321 through a positioning pin to achieve cooling area coverage. The upper and lower closing sleeves 373 are fixed by locking bolts 374. The docking strip 323 on the outer wall of the grinding tooth pattern 322 is embedded into the strip-shaped docking groove 377 on the inner wall of the heat-conducting ring 376 to form an efficient heat conduction interface. The cold flow machine 371 is a scroll compressor, which outputs a cooling medium to the heat exchange channel 372. The cooling medium is an ethylene glycol solution at -10°C to 15°C. The heat exchange channel 372 is a stainless steel spiral coil pipe with a wall thickness of 2 mm and a controllable flow range of 5 - 30 L / min.

[0046] The inner barrel through-channel 375 and the heat exchange channel 372 are sealed and connected by a flange. The cooling medium forms a turbulent flow in the channel (Reynolds number > 4000) to improve the heat dissipation efficiency.

[0047] During the grinding process, the frictional heat between the grinding tooth pattern 322 and the material (local temperature can reach 120°C) is transferred to the heat-conducting ring 376 through the docking strip 323. The copper-aluminum alloy material quickly diffuses the heat to the entire surface of the heat-conducting ring. The low-temperature ethylene glycol solution pumped by the cold flow machine 371 flows at a high speed in the heat exchange channel 372 and exchanges heat with the heat-conducting ring 376 through the pipe wall to take the heat out of the system, and the temperature difference efficiency is more than 85%. The joint surface between the closing sleeve 373 and the crusher barrel 32 uses a graphite wound gasket (temperature resistance -200°C to 600°C), and with the uniform pre-tightening force of the locking bolt 374, zero leakage of the coolant is achieved. The precise fit between the heat-conducting ring 376 and the docking strip 323 not only ensures the heat conduction efficiency but also prevents the cooling medium from seeping into the grinding chamber. The locking bolt 374 is fixed with an M12 bolt (pre-tightening force 80 N·m), and the disassembly and assembly time < 10 minutes, which is convenient for maintaining the grinding sleeve 321 or replacing the heat-conducting ring 376.

[0048] In the continuous grinding test of soybeans (oil content 18%) in this embodiment, the cooling part 37 controls the temperature of the grinding sleeve at 65°C, and no oil carbonization phenomenon occurs. The peroxide value of the finished product is reduced by 30%. Example 5. Based on the content described in the above embodiments, please refer to Figure 2 and Figure 7 . For the specific implementation structure of the secondary cold air circulator 38, the design of this embodiment is as follows: The main body of the secondary cold air circulator 38 is an air flow inlet cylinder 381. One end of the air flow inlet cylinder 381 is fixedly installed with the pulverizer cylinder 32 through a support flange 382. The other end of the air flow inlet cylinder 381 is externally connected with an air receiving end 383. A pneumatic pressure regulating part 384 is arranged on the air flow inlet cylinder 381. The air vent end of the air flow inlet cylinder 381 is butted against the pulverizer cylinder 32 through a filtering part 385.

[0049] The support flange 382 is fixed to the pulverizer cylinder 32 by using a double-layer sealing ring and high-strength bolts to ensure that there is no leakage in the air flow path. The cylinder body of the air flow inlet cylinder 381 is made of 304 stainless steel. The pneumatic pressure regulating part 384 integrates a PID control algorithm and drives a butterfly valve through a stepping motor to realize a pneumatic pressure regulation range of 0 - 50 kPa, which is adapted to the cooling requirements of different materials (for example, low-pressure cooling is required for grain pulverization, and high-pressure dust suppression is required for oil materials). For low-temperature brittle materials: set the pneumatic pressure to 15 kPa and the cold air flow temperature to -10 °C to avoid material softening and adhesion; for high-fat materials: set the pneumatic pressure to 40 kPa and the cold air flow temperature to 5 °C to inhibit oil oxidation and reduce the risk of dust explosion.

[0050] The filtering part 385 includes three-stage filter meshes: a coarse filter layer (stainless steel woven mesh with a pore diameter of 1 mm) intercepts large-particle impurities; a medium-efficiency filter layer (glass fiber with a filtration efficiency of ≥ 95% @ 5 μm); a HEPA filter layer (filtration efficiency of ≥ 99.97% @ 0.3 μm) to prevent fine powder from entering the cold air circulator and causing blockage. The air receiving end 383 is connected to an external cold source (such as a scroll refrigeration unit). When the cold air flow passes through the air flow inlet cylinder 381, it forms a spiral flow through the internal guide plates in the cylinder (with an inclination angle of 45° and a spacing of 80 mm), improving the heat exchange uniformity with the pulverized material.

[0051] For those skilled in the art, it is obvious that the present invention is not limited to the details of the above exemplary embodiments, and the present invention can be implemented in other specific forms without departing from the spirit or basic characteristics of the present invention. Therefore, in any aspect, the embodiments should be regarded as exemplary and non-limiting. The scope of the present invention is defined by the appended claims rather than the above description. Therefore, it is intended to include all changes falling within the meaning and scope of the equivalent elements of the claims in the present invention.

[0052] In addition, it should be understood that although this specification is described in terms of embodiments, not every embodiment contains only one independent technical solution. This narrative manner of the specification is only for clarity. Those skilled in the art should regard the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. An automatic feeding grain milling device, comprising a base (1), an equipment frame (2) erected on the base (1), and a milling machine case (3) installed on the equipment frame (2), characterized in that, Flank support frames (5) are arranged on the side edges of the base (1), and a transmission box (6) is erected thereon. The transmission box (6) is internally provided with a screw feeder and is driven by a variable-frequency motor for conveying grains; The top end of the transmission box (6) is connected to a falling frame (7). A vibration motor is installed at the bottom of the falling frame (7), and it is docked with the receiving hopper (4) of the milling machine case (3) through a feeding hopper (8); The milling machine case (3) includes a milling box frame (31) and a pulverizer cylinder (32) erected therein. The output end of the receiving hopper (4) is connected to the pulverizer cylinder (32); A driving assembly (33) is further provided in the milling box frame (31), and an operating assembly (34) is installed at its driving end. The operating assembly (34) extends into the cylinder cavity of the pulverizer cylinder (32) to perform grain pulverization; An outlet part (35) is arranged at the output end of the pulverizer cylinder (32), and its bottom is connected to a feeding part (36); A receiving frame (21) and a filtering bar (22) erected thereon are provided in the equipment frame (2). The feeding part (36) inputs materials into the receiving frame (21), and the filtering bar (22) is used for separating incompletely pulverized particles and enabling them to flow back to the transmission box (6) for cyclic processing; A cooling unit is arranged in the milling box frame (31), including: A number of independent cooling parts (37) are successively sleeved on the outer wall of the pulverizer cylinder (32) to achieve primary cooling through contact heat conduction; A secondary cold flow circulator (38) is installed at the output end of the pulverizer cylinder (32) and is connected to the outlet part (35), and secondary cooling is completed through air flow cooling.

2. The automatic feeding grain milling device according to claim 1, characterized in that, The receiving hopper (4) includes a receiving end (41) with a conical flare, a double-layer conical material gathering part (42) connected to its bottom, and a passing end (43) penetrating through the material gathering part (42). The bottom of the material gathering part (42) is externally connected to an auxiliary material pipeline (44).

3. The automatic feeding grain milling device according to claim 1, characterized in that, The operating assembly (34) includes a pulverizing shaft (343) installed on the pulverizer cylinder (32) through a fixed flange (341). The pulverizing shaft (343) is driven by the driving assembly (33) and penetrates through the cylinder cavity of the pulverizer cylinder (32), and both ends are supported bidirectionally by bearing seats.

4. The automatic feeding grain milling device according to claim 3, characterized in that, Spiral pulverizing blades (344) with a spiral angle of 45° are welded on the pulverizing shaft (343). A number of grinding sleeves (321) are provided on the cylinder body of the pulverizer cylinder (32). The grinding sleeves (321) and the cylinder wall of the pulverizer cylinder (32) are of an integrated structure. Annular grinding tooth patterns (322) are provided on the inner wall of the grinding sleeves (321), forming a dynamic shear-extrusion composite pulverization area with the spiral pulverizing blades (344).

5. The automatic feeding grain milling device according to claim 4, wherein, The cooling part (37) includes a cold flow machine (371), a closing sleeve (373) fixed to the outer wall of the pulverizer cylinder (32) through a locking bolt (374), and a heat conduction ring (376) embedded in the inner wall of the closing sleeve (373).

6. The automatic feeding grain milling device according to claim 5, characterized in that, The inner wall of the heat conduction ring (376) is provided with a strip-shaped docking groove (377), which is coupled with the docking strip (323) on the outer wall of the grinding sleeve (321) to form a heat conduction interface; the cold flow machine (371) conveys a cooling medium to the closed sleeve (373) through the heat exchange channel (372).

7. The automatic feeding grain milling device according to claim 1, characterized in that, The air flow inlet cylinder (381) of the secondary cold flow device (38) is connected to the pulverizer cylinder (32) through a support flange (382), and the support flange (382) uses a double-layer fluororubber sealing ring and is fixed by high-strength bolts; A compressed air adjusting part (384) is arranged on the air flow inlet cylinder (381), and the air inlet end of the air flow inlet cylinder (381) is docked with the pulverizer cylinder (32) through a filtering part (385); The compressed air adjusting part (384) integrates a PID control algorithm and drives a butterfly valve through a stepping motor to achieve an air pressure adjustment range of 0 - 50 kPa; The filtering part (385) includes a stainless steel coarse filter layer, a fiberglass medium-effect filter layer, and a HEPA filter layer arranged in sequence.

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