Reduced iron powder ultrafine grinding protection mechanism and grinding and classifying machine

Abstract

The present application discloses a reduced iron powder ultrafine grinding protection mechanism, comprising a processing box for purifying protective gas, the processing box being provided with an air intake mechanism, an air outlet mechanism and a primary purification mechanism, wherein the primary purification mechanism comprises a conveyor belt, a first filter screen and a reduced iron powder discharge port, wherein the first filter screen is vertically arranged at the air outlet end of the air intake mechanism, the conveyor belt is arranged on the air intake surface of the first filter screen, the conveyor belt is provided with a scraper for scraping off the reduced iron powder on the surface of the first filter screen, a motor for driving the conveyor belt to rotate is provided on the outside of the processing box, and the reduced iron powder discharge port is opened at the bottom of the conveyor belt; the reduced iron powder ultrafine grinding protection mechanism and the crushing and classifying machine of the embodiment of the present application ensure the purity of the nitrogen by circulating and filtering the flowing nitrogen, and effectively recover the reduced iron powder in the nitrogen.

Description

Technical Field

[0001] The present application relates to the technical field of ultrafine grinding of reduced iron powder, and in particular to an ultrafine grinding protection mechanism for reduced iron powder and a grinding and classifying machine. Background Art

[0002] Reduced iron powder, also known as a "double absorber," is a gray or black powder primarily composed of elemental iron. It is typically produced by reducing ferroferric oxide (Fe3O4) in a stream of hydrogen or carbon monoxide under high heat. Because it is already in powder form and has a very loose microstructure, its surface area is large, allowing it to absorb moisture and oxygen from the air. It is commonly used for food preservation and as a high-quality reducing agent in chemical production and laboratory operations. Industrial production of iron powder is often achieved through atomization or reduction methods.

[0003] When it comes to iron powder production processes using the atomization or reduction methods, the finer the iron powder, the better the effect. During the iron powder crushing process, the sintered iron powder lumps after reduction in the steel belt furnace need to be broken up. Since the finer the iron powder particles, the more easily they oxidize, the higher the requirements for breaking up the lumps. This requires breaking up the lumps in a closed environment or using nitrogen as a protective gas. Therefore, a graded impact mill with a nitrogen protection system is generally used for this purpose, also known as airflow crushing. A nitrogen-protected crusher is used for ultrafine grinding in a nitrogen environment to prevent oxidation of the highly active iron powder. Airflow crushing can crush high-hardness iron powder to the micron level, while the nitrogen protection system is primarily used to prevent oxidation of the iron powder during the crushing process and to avoid dust explosions. In the iron powder classification process, a rotary vibrating screen is generally used for coarse powder screening. At the same time, with the national standard screen, it can screen reduced iron powders such as -40 mesh, 60 mesh, 80 mesh, 100 mesh, and -200 mesh. However, for the classification of high-precision micron-level ultrafine iron powder, an air flow classifier is mostly used. At the same time, since ultrafine iron powder is easily oxidized, a nitrogen protection classifier is generally used for high-precision classification.

[0004] However, in the process of crushing reduced iron powder, in order to prevent the mixing of external air, the nitrogen protection classifier generally adopts a closed-loop system. When nitrogen protects the iron crushing powder, the nitrogen is in a flowing state, and the tiny particles of iron powder are continuously dissolved in the nitrogen to form an aerosol. The gas impurities and impurities dissolved in the iron powder will be mixed into the nitrogen. After long-term use, the purity of the nitrogen will be reduced, causing pollution to the nitrogen protection gas and affecting the quality of the reduced iron powder. Summary of the Invention

[0005] The present application aims to solve one of the technical problems in the related art at least to a certain extent.

[0006] To this end, the first purpose of the present application is to provide a reduced iron powder ultrafine grinding protection mechanism, which ensures the purity of the nitrogen by circulating and filtering the flowing nitrogen and effectively recovers the reduced iron powder in the nitrogen.

[0007] The second object of this application is to provide a crushing and classifying machine.

[0008] To achieve the above-mentioned purpose, the first embodiment of the present application proposes a reduced iron powder ultrafine grinding protection mechanism and a grinding and classifying machine, including a processing box for purifying protective gas, an air intake mechanism, an air outlet mechanism and a primary purification mechanism, wherein the air intake mechanism is arranged at the air intake end of the processing box, the air outlet mechanism is arranged at the air outlet end of the processing box, and the primary purification mechanism is arranged between the air intake mechanism and the air outlet mechanism. The primary purification mechanism includes a conveyor belt, a first filter and a reduced iron powder discharge outlet, wherein the first filter is vertically arranged at the air outlet end of the air intake mechanism, the conveyor belt is arranged on the air intake surface of the first filter, and a scraper is provided on the conveyor belt to scrape off the reduced iron powder on the surface of the first filter. A motor for driving the conveyor belt to rotate is provided outside the processing box, and the reduced iron powder discharge outlet is opened at the bottom of the conveyor belt.

[0009] According to the ultrafine grinding protection mechanism of the reduced iron powder in the embodiment of the present application, the purity of the nitrogen is ensured by circulating and filtering the flowing nitrogen, and the reduced iron powder in the nitrogen is effectively recovered.

[0010] In addition, the ultrafine grinding protection mechanism for reduced iron powder and the grinding and classifying machine proposed in the present application may also have the following additional technical features:

[0011] In one embodiment of the present application, a guide cover is provided between the air outlet end of the first filter and the air inlet end of the air outlet mechanism, a rotating air guide plate is provided inside the guide cover, and a scraping blade made of silicone rubber is provided in the circumferential direction of the rotating air guide plate, and the scraping blade is in contact with the air outlet surface of the first filter.

[0012] In one embodiment of the present application, the deflector cover is a detachable arc-shaped structure, and a recessed accumulation groove is provided at the bottom of the deflector cover.

[0013] In one embodiment of the present application, a secondary purification mechanism is also included, which is arranged at the air inlet end of the air outlet mechanism. The secondary purification mechanism includes a condensing dehumidifier and a second filter, wherein the second filter is arranged at the air inlet end of the air outlet mechanism, and the lower surface of the second filter is in contact with the scraping blade, and the condensing dehumidifier is arranged at the air outlet end of the second filter.

[0014] In one embodiment of the present application, support ribs are provided inside the first filter screen, a vibrator is provided on the support ribs, and the reduced iron powder discharge outlet is provided with a brush head for cleaning the reduced iron powder attached to the scraper surface.

[0015] In one embodiment of the present application, the air intake mechanism includes an air inlet, a high-speed fan, a first air guide plate and a guide pipe, wherein the air outlet end of the guide pipe is connected to the air inlet end of the first filter, the air inlet is arranged at the air inlet end of the guide pipe, the high-speed fan is arranged at the air inlet, a plurality of the first air guide plates are provided, and the plurality of the first air guide plates are arranged in a vertical direction in the guide pipe, and the plurality of the first air guide plate openings are arranged obliquely downward at the air outlet end of the high-speed fan.

[0016] In one embodiment of the present application, the air outlet end of the guide pipe is provided with a plurality of second air guide blades arranged in a vertical direction, and the openings of the second air guide blades are inclined upward.

[0017] In one embodiment of the present application, the air outlet mechanism includes an exhaust fan and an exhaust port, wherein the exhaust port is arranged at the air outlet end of the condensing dehumidifier, and the exhaust fan is arranged at the exhaust port.

[0018] In one embodiment of the present application, a blanking chute is provided at the bottom of the processing box, a reduced iron powder collecting mechanism is provided inside the blanking chute, and the reduced iron powder collecting mechanism includes a collecting box and a sealing roll, wherein the top of the collecting box is hollowed out, and the collecting box can be horizontally pulled out and arranged in the entrance of the blanking chute, a sealing roll bracket is provided at the top of the entrance of the blanking chute, the sealing roll is detachably arranged at the bottom of the sealing roll bracket, a sealing tape is wrapped around the sealing roll, and a roller is provided at the entrance of the blanking chute to make the sealing tape adhere to the top edge of the collecting box.

[0019] To achieve the above-mentioned purpose, the second embodiment of the present application proposes a pulverizing and classifying machine, which includes the above-mentioned ultrafine pulverizing and protection mechanism for reduced iron powder, and the pulverizing and classifying machine is a nitrogen protection classifier.

[0020] Additional aspects and advantages of the present application will be given in part in the description below, and in part will become apparent from the description below, or will be learned through practice of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] The above and / or additional aspects and advantages of the present application will become apparent and easily understood from the following description of the embodiments in conjunction with the accompanying drawings, in which:

[0022] Figure 1 This is a schematic structural diagram of a reduced iron powder ultrafine grinding protection mechanism according to one embodiment of the present application;

[0023] Figure 2 is a front cross-sectional view of a reduced iron powder ultrafine grinding protection mechanism according to another embodiment of the present application;

[0024] Figure 3 for Figure 2 A magnified view of middle A;

[0025] Figure 4 for Figure 2 Enlarged view of middle B;

[0026] Figure 5 This is a schematic structural diagram of a reduced iron powder collecting mechanism according to another embodiment of the present application.

[0027] As shown in the figure: 1. Processing box; 11. Blanking chute; 2. Air intake mechanism; 21. Air inlet; 22. High-speed fan; 23. First air guide vane; 24. Guide pipe; 3. Air outlet mechanism; 31. Exhaust fan; 32. Exhaust port; 4. Secondary purification mechanism; 41. Condensation dehumidifier; 411. Mounting base; 412. Drain port; 42. Second filter; 5. Reduced iron powder collection mechanism; 51. Collection box; 51 1. Buckle; 52. Sealing roll; 521. Sealing tape; 53. Roller; 54. Sealing roll holder; 6. Primary purification mechanism; 61. Air guide hood; 611. Accumulation trough; 62. Rotating air guide plate; 63. Second air guide vane; 64. Conveyor belt; 641. Scraper; 642. Brush head; 643. Motor; 65. First filter; 651. Support ribs; 652. Vibrator; 66. Reduced iron powder discharge outlet. DETAILED DESCRIPTION

[0028] The embodiments of the present application are described in detail below. Examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to be used to explain the present application and are not to be construed as limiting the present application. On the contrary, the embodiments of the present application include all variations, modifications, and equivalents that fall within the spirit and scope of the appended claims.

[0029] The following describes the reduced iron powder ultrafine grinding protection mechanism and the grinding and classifying machine according to the embodiment of the present application with reference to the accompanying drawings.

[0030] like Figure 1-4 As shown, the ultrafine grinding protection mechanism of reduced iron powder of the embodiment of the present application may include a processing box 1 for purifying protective gas, and the processing box 1 is provided with an air intake mechanism 2, an air outlet mechanism 3 and a primary purification mechanism 6.

[0031] The air intake mechanism 2 is arranged at the air intake end of the processing box 1 , the air outlet mechanism 3 is arranged at the air outlet end of the processing box 1 , and the primary purification mechanism 6 is arranged between the air intake mechanism 2 and the air outlet mechanism 3 .

[0032] The primary purification mechanism 6 may include a conveyor belt 64, a first filter 65 and a reduced iron powder discharge outlet 66, wherein the first filter 65 is vertically arranged at the air outlet end of the air intake mechanism 2, the conveyor belt 64 is arranged on the air intake surface of the first filter 65, and the conveyor belt 64 is provided with a scraper 641 for scraping off the reduced iron powder on the surface of the first filter 65. A motor 643 for driving the conveyor belt 64 to rotate is provided on the outside of the processing box 1, and the reduced iron powder discharge outlet 66 is opened at the bottom of the conveyor belt 64.

[0033] Specifically, when it is necessary to circulate and filter the nitrogen in the crushing and classifying machine, the air intake mechanism 2 is connected to the discharge end of the nitrogen in the crushing and classifying machine, and the air outlet mechanism 3 is connected to the nitrogen input end of the crushing and classifying machine. Since the nitrogen generated at the discharge end of the crushing and classifying machine contains reduced iron powder and other impurities to form mixed nitrogen, the mixed nitrogen first passes through the air intake mechanism 2 and enters the first filter 65. After the mixed nitrogen is filtered through the first filter 65, the pure nitrogen is discharged from the air outlet mechanism 3 and provided to the crushing and classifying machine for reuse.

[0034] When the mixed nitrogen passes through the first filter 65, the impurities intercepted on the surface of the first filter 65 (the main component is reduced iron powder, and the reduced iron powder particles that can dissolve in nitrogen are generally very small in diameter, so the quality is relatively good) adhere to the air inlet surface of the first filter 65. At this time, the conveyor belt 64 is driven to rotate by the motor 643, and the scraper 641 on the conveyor belt 64 scrapes the reduced iron powder on the surface of the first filter 65 downward. The reduced iron powder is discharged through the reduced iron powder discharge port 66 for collection and utilization. In the process of the scraper 641 moving downward, the scrapers 641 adjacent to each other above and below seal the nitrogen airflow, so that the nitrogen is squeezed into the first filter 65, so that the nitrogen is more fully filtered.

[0035] In one embodiment of the present application, Figure 2 As shown, a guide cover 61 is arranged between the air outlet end of the first filter 65 and the air inlet end of the air outlet mechanism 3, and a rotating air guide plate 62 is arranged inside the guide cover 61. A scraping blade made of silicone rubber is arranged in the circumferential direction of the rotating air guide plate 62, and the scraping blade is in contact with the air outlet surface of the first filter 65.

[0036] Specifically, in the process of the first filter 65 transmitting nitrogen to the air outlet mechanism 3, the deflector 61 plays a role in guiding the nitrogen. The nitrogen flow drives the rotating air guide plate 62 to rotate. When the rotating air guide plate 62 rotates, it drives the scraping blade to scrape the air outlet surface of the first filter 65, so that the air outlet surface of the first filter 65 remains clean.

[0037] In one embodiment of the present application, Figure 2 As shown, the air deflector 61 is a detachable arc-shaped structure, and a concave accumulation groove 611 is provided at the bottom of the air deflector 61.

[0038] Specifically, during the rotation of the rotating air guide plate 62 and the scraping blade, the scraping blade scrapes the filtered impurities (mainly reduced iron powder) generated by scraping the surface of the first filter 65, and the reduced iron powder eventually enters the accumulation tank 611 due to gravity, preventing the reduced iron powder in the guide cover 61 from being discharged. The arc-shaped structure of the guide cover 61 makes the air tightness better during the rotation of the scraping blade. During the flow of nitrogen in the guide cover 61, it can stably push the rotating air guide plate 62 and the scraping blade to rotate. The detachable guide cover 61 is designed to facilitate opening the guide cover 61, taking out the reduced iron powder in the accumulation tank 611, and maintaining the rotating air guide plate 62 and the first filter 65.

[0039] In one embodiment of the present application, Figure 2 As shown, a secondary purification mechanism 4 is provided at the air inlet end of the air outlet mechanism 3. The secondary purification mechanism 4 may include a condensing dehumidifier 41 and a second filter 42, wherein the second filter 42 is provided at the air inlet end of the air outlet mechanism 3, and the lower surface of the second filter 42 is in contact with the scraping blade, and the condensing dehumidifier 41 is provided at the air outlet end of the second filter 42. It should be noted that in order to facilitate the installation and disassembly of the condensing dehumidifier 41, a mounting bracket 411 may be provided on the outside of the condensing dehumidifier 41.

[0040] Specifically, when the nitrogen that has undergone primary purification enters the gas outlet mechanism 3, the second filter 42 prevents residual impurities in the nitrogen from entering the condensation dehumidifier 41. The condensation dehumidifier 41 condenses the residual moisture in the nitrogen and discharges it through the drain port 412 of the condensation dehumidifier 41, making the nitrogen drier.

[0041] In addition, the scraping blade can also scrape the bottom of the second filter screen 42 during the rotation process, so that the bottom of the second filter screen 42 remains clean, and the reduced iron powder generated by scraping enters the accumulation tank 611.

[0042] In one embodiment of the present application, Figure 3 As shown, a support rib 651 is provided inside the first filter 65 , and a vibrator 652 is provided on the support rib 651 .

[0043] Specifically, when the first filter 65 performs primary filtration on nitrogen, a large amount of reduced iron powder residue is generated on its surface. At this time, the reduced iron powder attached to the first filter 65 is separated from it by energizing the vibrator 652, so that the scraper 641 on the conveyor belt 64 can scrape the first filter 65 clean. In addition, the supporting ribs 651 mainly play the role of supporting the first filter 65, so that the first filter 65 and the scraper 641 are more closely fitted, and the air inlet surface of the first filter 65 is fully scraped.

[0044] In one embodiment of the present application, Figure 3 As shown, the reduced iron powder discharge outlet 66 is provided with a brush head 642 for cleaning the reduced iron powder adhered to the surface of the scraper 641. Specifically, during the rotation of the conveyor belt 64, the scraper 641 scrapes the first filter 65, and a large amount of reduced iron powder will remain at the end of the scraper 641. At this time, when the scraper 641 moves to the reduced iron powder discharge outlet 66, the brush head 642 scrapes the scraper 641 to reduce the reduced iron powder remaining on the scraper 641.

[0045] In one embodiment of the present application, Figure 2 As shown, the air intake mechanism 2 may include an air inlet 21, a high-speed fan 22, a first air guide plate 23 and a guide pipe 24, wherein the air outlet end of the guide pipe 24 is connected to the air inlet end of the first filter 65, the air inlet 21 is arranged at the air inlet end of the guide pipe 24, the high-speed fan 22 is arranged at the air inlet 21, and a plurality of first air guide plates 23 are provided, and the plurality of first air guide plates 23 are arranged in a vertical direction in the guide pipe 24, and the openings of the plurality of first air guide plates 23 are arranged tilted downward at the air outlet end of the high-speed fan 22.

[0046] Specifically, the mixed nitrogen (nitrogen containing impurities) is sucked in by the high-speed fan 22 and transferred to the first filter 65 through the guide tube 24. During this period, the first air guide plate 23 with an opening tilted downward applies a tilted downward displacement to the airflow, blowing the impurities (mainly reduced iron powder) precipitated at the bottom of the guide tube 24 to transfer them and prevent the impurities from accumulating at the bottom of the guide tube 24.

[0047] In one embodiment of the present application, Figure 2 and Figure 3 As shown, the air outlet end of the guide pipe 24 is provided with a plurality of second air guide blades 63 arranged in a vertical direction, and the openings of the second air guide blades 63 are inclined upward.

[0048] Specifically, the second air guide 63 allows the airflow entering the first filter 65 to enter from the top of the conveyor belt 64, thereby extending the contact length between the nitrogen and the first filter 65 and making the nitrogen filtering more complete.

[0049] In one embodiment of the present application, Figure 2As shown, the air outlet mechanism 3 may include an exhaust fan 31 and an exhaust port 32, wherein the exhaust port 32 is arranged at the air outlet end of the condensing dehumidifier 41, and the exhaust fan 31 is arranged at the exhaust port 32. The exhaust fan 31 generates a negative pressure on the exhaust port 32 to prevent the formation of vortices in the air guide cover 61 and prevent airflow blockage.

[0050] In one embodiment of the present application, Figure 2 and Figure 5 As shown, a blanking chute 11 is provided at the bottom of the processing box, and a reduced iron powder collecting mechanism 5 is provided inside the blanking chute 11. The reduced iron powder collecting mechanism 5 may include a collecting box 51 and a sealing roll 52, wherein the top of the collecting box 51 is hollowed out, and the collecting box 51 can be horizontally pulled out and arranged in the entrance of the blanking chute 11, and a sealing roll bracket 54 is provided at the top of the entrance of the blanking chute 11, and the sealing roll 52 is detachably arranged at the bottom of the sealing roll bracket 54, and a sealing tape 521 is wrapped around the sealing roll 52, and a roller 53 is provided at the entrance of the blanking chute 11 to make the sealing tape 521 adhere to the top edge of the collecting box 51.

[0051] Specifically, before collecting the reduced iron powder, the staff will push the collection box 51 completely into the entrance of the blanking chute 11, and then connect one end of the sealing tape 521 on the sealing roll 52 to the buckle 511 on the outside of the collection box 51. During the collection of the reduced iron powder, the reduced iron powder filtered in the nitrogen passes through the reduced iron powder discharge outlet 66 and enters the blanking chute 11 downward, and finally falls into the collection box 51. Finally, the staff pulls the collection box 51 out of the entrance of the blanking chute 11, and the sealing tape 521 on the sealing roll 52 is released to cover the top of the collection box 51. At this time, the roller 53 tightly adheres the sealing tape 521 to the top of the collection box 51 to prevent the reduced iron powder in the collection box 51 from contacting the outside air.

[0052] After the collecting box 51 is completely pulled out from the entrance of the blanking chute 11 , the sealing tape 521 connected to the sealing roll 52 is cut off, so that the reduced iron powder in the collecting box 51 is sealed and protected.

[0053] In addition, the present application provides a pulverizing and classifying machine, comprising the above-mentioned ultrafine pulverizing and protecting mechanism for reduced iron powder, wherein the pulverizing and classifying machine is a nitrogen-protected classifying machine.

[0054] In summary, the ultrafine grinding protection mechanism for reduced iron powder and the grinding and classifying machine of the embodiment of the present application ensure the purity of nitrogen by circulating and filtering the flowing nitrogen, and effectively recover the reduced iron powder in the nitrogen.

[0055] In the description of this specification, the terms "first" and "second" are used for descriptive purposes only and should not be understood to indicate or imply relative importance or implicitly specify the number of the technical features indicated. Therefore, a feature specified as "first" or "second" may explicitly or implicitly include at least one of such features. In the description of this application, "plurality" means at least two, for example, two, three, etc., unless otherwise specifically defined.

[0056] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present application. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art can combine and combine different embodiments or examples described in this specification and features of different embodiments or examples without contradiction.

[0057] Although the embodiments of the present application have been shown and described above, it can be understood that the above embodiments are exemplary and cannot be understood as limitations on the present application. Ordinary technicians in this field can change, modify, replace and deform the above embodiments within the scope of the present application.

Claims

1. A reduced iron powder ultrafine grinding protection mechanism, characterized in that: It includes a processing box, an air inlet mechanism, an air outlet mechanism and a primary purification mechanism for purifying the protective gas, the protective gas is nitrogen, wherein, The air intake mechanism is arranged at the air intake end of the processing box, the air outlet mechanism is arranged at the air outlet end of the processing box, and the primary purification mechanism is arranged between the air intake mechanism and the air outlet mechanism; The primary purification mechanism includes a conveyor belt, a first filter screen and a reduced iron powder discharge port, wherein: The first filter is vertically arranged at the air outlet end of the air inlet mechanism; The conveyor belt is arranged on the air inlet surface of the first filter screen, and a scraper is provided on the conveyor belt to scrape the reduced iron powder on the surface of the first filter screen; the scraper scrapes the reduced iron powder on the surface of the first filter screen downward, and the reduced iron powder is discharged through the reduced iron powder discharge port for collection and utilization. In the process of the scraper moving downward, the scrapers adjacent to each other above and below seal and constrain the nitrogen flow, so that the nitrogen is squeezed into the first filter screen, so that the nitrogen is filtered more fully. A motor for driving the conveyor belt to rotate is provided outside the processing box, and the reduced iron powder discharge port is opened at the bottom of the conveyor belt; The air intake mechanism includes an air inlet, a high-speed fan, a first air guide plate, and a guide pipe, wherein the air outlet end of the guide pipe is connected to the air inlet end of the first filter screen; the air inlet is arranged at the air inlet end of the guide pipe, the high-speed fan is arranged at the air inlet, a plurality of first air guide plates are provided, and the plurality of first air guide plates are arranged in a vertical direction in the guide pipe, and the openings of the plurality of first air guide plates are arranged at an angle downward at the air outlet end of the high-speed fan, and the first air guide plates can blow impurities deposited at the bottom of the guide pipe to transfer them, thereby preventing impurities from accumulating at the bottom of the guide pipe; The air outlet end of the guide pipe is provided with a plurality of second air guide plates arranged in a vertical direction. The openings of the second air guide plates are inclined upward. The second air guide plates allow the airflow entering the first filter to enter from the top of the conveyor belt, thereby extending the contact length between the nitrogen and the first filter and making the nitrogen filtering more sufficient.

2. The reduced iron powder ultrafine grinding protection mechanism according to claim 1, characterized in that: A flow guide cover is provided between the air outlet end of the first filter screen and the air inlet end of the air outlet mechanism, and a rotating air guide plate is provided inside the flow guide cover; A scraping blade made of silicone rubber is provided in the circumferential direction of the rotating air guide plate, and the scraping blade is in contact with the air outlet surface of the first filter screen.

3. The ultrafine grinding protection mechanism for reduced iron powder according to claim 2, characterized in that: The deflector cover is a detachable arc-shaped structure, and a concave accumulation groove is provided at the bottom of the deflector cover.

4. The ultrafine grinding protection mechanism for reduced iron powder according to claim 2, characterized in that: It also includes a secondary purification mechanism, which is arranged at the air inlet end of the air outlet mechanism, and includes a condensing dehumidifier and a second filter, wherein: The second filter is arranged at the air inlet end of the air outlet mechanism, and the lower surface of the second filter is in contact with the scraping blade; The condensing dehumidifier is arranged at the air outlet end of the second filter screen.

5. The reduced iron powder ultrafine grinding protection mechanism according to claim 1, characterized in that: The first filter screen is provided with support ribs inside, and a vibrator is provided on the support ribs; The reduced iron powder discharge port is provided with a brush head for cleaning the reduced iron powder attached to the surface of the scraper.

6. The ultrafine grinding protection mechanism for reduced iron powder according to claim 4, characterized in that: The air outlet mechanism includes an exhaust fan and an exhaust port, wherein: The exhaust port is arranged at the air outlet end of the condensing dehumidifier, and the exhaust fan is arranged at the exhaust port.

7. The ultrafine grinding protection mechanism for reduced iron powder according to claim 1, characterized in that: The bottom of the processing box is provided with a chute, and a reduced iron powder collecting mechanism is provided inside the chute. The reduced iron powder collecting mechanism includes a collecting box and a sealing roll, wherein: The top of the collection box is hollowed out, and the collection box can be horizontally pulled out and arranged in the entrance of the blanking chute. A sealing roll bracket is provided at the top of the entrance of the blanking chute. The sealing roll is detachably arranged at the bottom of the sealing roll bracket, and a sealing tape is wound around the sealing roll; A roller is provided at the entrance of the blanking chute to make the sealing tape adhere to the top edge of the collecting box.

8. A pulverizing and classifying machine comprising the reduced iron powder ultrafine pulverizing protection mechanism according to any one of claims 1 to 7, characterized in that: The pulverizing and classifying machine is a nitrogen protection classifying machine.

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