Centrifugal classification device for airflow pulverized electrically fused chromium oxide superfine powder

Abstract

The utility model belongs to airflow crushing electrofusion chromium oxide superfine powder's centrifugal classification technical field, the utility model discloses a kind of airflow crushing electrofusion chromium oxide superfine powder is with centrifugal classification device, grading cylinder one is fixedly arranged in the upper portion of airflow pulverizer pulverizing cylinder, grading cylinder two is fixedly arranged in the upper center position of grading cylinder one;Cooling oil pipe is correspondingly set in the right side position of discharge gate;Driving motor is fixedly installed in the upper center of conical shell cylinder;Cooling cylinder is fixedly arranged in the upper center position of grading cylinder two, driving shaft is fixedly installed on the inner ring of bearing that is symmetrically arranged up and down;Centrifugal classification mechanism is fixedly arranged in the lower position of cooling cylinder.The utility model has beneficial effects: 1, greatly improve the classification screening efficiency of electrofusion chromium oxide powder.2, both can be intermittently circulated cooling to driving shaft and bearing, also can lubricate bearing, improve the service life of driving shaft and bearing.

Description

Technical Field

[0001] This utility model belongs to the field of centrifugal classification technology for airflow pulverization of fused chromium oxide ultrafine powder, specifically relating to a centrifugal classification device for airflow pulverization of fused chromium oxide ultrafine powder. Background Technology

[0002] Thermal spraying refers to the process of depositing finely dispersed metallic or non-metallic materials, in a molten or semi-molten state, onto a prepared substrate surface to form a sprayed coating layer with specific properties. Electrofused chromium oxide powder is an excellent thermal spraying raw material. Its coating has a melting point of 2435℃, high hardness (HRC=65~75), and extremely stable chemical properties, exhibiting excellent resistance to both acids and alkalis, as well as superior corrosion resistance. Thermal spraying electrofused chromium oxide powder materials possess high bonding strength with the substrate, dense coating, high hardness, good polishing performance, low coefficient of friction, resistance to abrasive, hard surface, and fiber wear, resistance to particle erosion and cavitation, and excellent comprehensive properties such as wear resistance, self-adhesion, and corrosion resistance. The particle size of ultrafine electrofused chromium oxide powder for thermal spraying is typically classified into micron, submicron, and nanometer sizes; these different particle sizes are collectively referred to as ultrafine electrofused chromium oxide powder.

[0003] In the preparation process of ultrafine electrofused chromium oxide powder for thermal spraying, the pulverization and dispersion process is a crucial step. Currently, the main pulverization and dispersion methods are divided into mechanical (high-shear dispersers, sand mills, three-roll mills), airflow (fluidized bed airflow mills, flat airflow mills), and ultrasonic nano-dispersers. The working principle of an airflow mill is as follows: compressed air is injected at high speed into the pulverization chamber through nozzles. At the convergence point of multiple high-pressure airflows, the material is repeatedly collided, rubbed, and sheared, resulting in pulverization. The pulverized material, under the suction of a fan, moves with the rising airflow to a classifying device. Under the strong centrifugal force generated by the high-speed rotating classifying wheel, coarse and fine materials are separated. Fine particles that meet the particle size requirements are discharged through the classifying device, while coarse particles descend to the pulverization zone for further pulverization. In the classification device, when the air-jet mill is working, under the action of centrifugal force, large and heavy particles are thrown to the outer edge of the classification wheel and the side wall of the classification zone, and are no longer affected by centrifugal force, naturally falling into the mill for further pulverization; small and light particles are less affected by centrifugal force, enter the classification device with the airflow, and go to the next processing step through the discharge pipe of the classification device. By adjusting the rotation speed of the classification device, the magnitude of the centrifugal force during particle classification can be adjusted to achieve the purpose of centrifugally classifying ultrafine fused chromium oxide powder to a specified particle size. The main technical problems of the classification device of the existing air-jet mill are: 1. For example, patent application number 202322454208.8, patent name is a high-efficiency classification wheel for an air-jet mill, the classification wheel disclosed therein, the feeding method during centrifugal classification is that the material enters the classification wheel from the circumferential side of the classification wheel; the above-mentioned classification wheel feeding method has the technical problems of low classification accuracy and low classification efficiency for ultrafine fused chromium oxide powder. 2. Existing classifying wheels operate in a closed environment, and their main shaft rotates at high speed for extended periods, which easily leads to bearing overheating. To address these shortcomings, the inventors have developed a centrifugal classifying device for airflow pulverization of electrofused chromium oxide ultrafine powder, effectively solving these technical problems. Utility Model Content

[0004] To solve the above-mentioned technical problems, this utility model provides a centrifugal classification device for airflow pulverization of electrofused chromium oxide ultrafine powder. The structure of this utility model is scientifically and rationally designed and simple. This utility model can solve the problem of low classification and screening efficiency of the classification wheel in the prior art, and also solves the problem of bearing overheating caused by long-term high-speed rotation of the main shaft of the classification wheel.

[0005] The technical solution adopted in this utility model is as follows: a centrifugal classification device for airflow pulverization of electrofused chromium oxide ultrafine powder, comprising a classification cylinder one, a classification cylinder two, and a discharge port. The classification cylinder one is fixedly installed at the upper part of the airflow pulverizer cylinder, and the classification cylinder two is fixedly installed at the upper center of the classification cylinder one, with the classification cylinder one and classification cylinder two connected vertically. The discharge port is fixedly installed at the middle left side of the classification cylinder two, and the discharge port is connected to the interior of the classification cylinder two. A cooling oil pipe is correspondingly installed at the right side of the discharge port. The cooling oil pipe is L-shaped, with one end extending to the center of the classification cylinder two and the other end extending to the outer right side of the classification cylinder two, and is fixed to the outer wall of the classification cylinder two by an oil pipe flange. A three-way solenoid directional valve is fixedly installed at the upper right end of the cooling oil pipe, with the inlet pipe fixedly installed at the middle right side of the three-way solenoid directional valve and the outlet pipe fixedly installed at the middle front side of the three-way solenoid directional valve. The lower flange is located in the conical shell cylinder. At the bottom, the upper flange is located at the upper part of the conical shell, and the bottom of the conical shell is fixedly located at the upper center of the second classifier via the lower flange. The drive motor is fixedly installed at the upper center of the conical shell, and the power output shaft of the drive motor extends through the upper flange into the interior of the conical shell. The coupling is located at the bottom of the power output shaft of the drive motor. The cooling cylinder is fixedly located at the upper center of the second classifier. The bearings are symmetrically fixedly installed on the inner walls of the upper and lower ends of the cooling cylinder. The drive shaft is fixedly installed on the inner ring of the symmetrically installed bearings. The upper end of the drive shaft extends to the bottom of the coupling and is fixedly connected to the bottom of the coupling. The lower end of the drive shaft extends to the bottom of the centrifugal classifier. Two sealing gaskets are provided, one installed on the upper part of the bearing in the upper part of the cooling cylinder and the other installed on the bottom of the bearing in the lower part of the cooling cylinder. The centrifugal classifier is fixedly located at the lower part of the cooling cylinder. The centrifugal classifier is used to classify the particle size of ultrafine electrofused chromium oxide powder by centrifugal rotation.

[0006] The first grading cylinder is a cylindrical shape with an upper opening smaller than a lower opening, and the second grading cylinder is a hollow cylindrical shape with a lower opening and a closed upper part. The diameter of the second grading cylinder is smaller than the diameter of the first grading cylinder.

[0007] The inlet and outlet pipes are connected to the interior of the three-way solenoid directional valve body. The inlet pipe is fixedly connected to the outlet end of the hydraulic station via a connecting pipe, and the outlet pipe is fixedly connected to the return end of the hydraulic station. The three-way solenoid directional valve is fixedly connected to the PLC control module via a wire.

[0008] The conical shell is concentric with the power output shaft of the drive motor, the second classifier, and the first classifier.

[0009] The cooling oil pipe is connected to the interior of the cooling cylinder at the center end of the inner side of the second stage cylinder, and the cooling oil pipe and the cooling cylinder are vertically fixed and connected.

[0010] The centrifugal grading mechanism includes an upper grading plate, which is fixedly installed near the lower part of the cooling cylinder, and a fixing ring is located at the lower part of the cooling cylinder. Grading strips are evenly and equally angled around the circumferential sidewalls of the upper grading plate and the fixing ring. The upper end of the grading strip is fixed to the circumferential sidewall of the upper grading plate, and the lower end of the grading strip is fixed to the circumferential outer sidewall of the fixing ring. A connecting cylinder is fixedly installed at the lower end of the drive shaft and is fixedly connected to the bottom of the cooling cylinder. An upper guide plate is located between the fixing ring and the connecting cylinder. The upper guide plate has an irregular polygonal structure. One end of the upper guide plate is fixedly connected to the outer wall of the connecting cylinder, and the other end of the upper guide plate is fixed to the bottom of the fixing ring. The upper guide plate is evenly and equally angled around the circumference of the fixing ring and the connecting cylinder. The lower guide plate is triangular. The long side end face of the lower guide plate is fixed to the outer wall of the connecting cylinder. The lower guide plate is evenly and equally angled around the outer wall of the connecting cylinder.

[0011] The upper guide plate and the lower guide plate are arranged horizontally in a linear fashion, forming a guide channel for guiding graded ultrafine electrofused chromium oxide powder.

[0012] The working process of this centrifugal classifier for air-jet pulverized fused chromium oxide ultrafine powder is as follows: 1. Particle size classification of ultrafine fused chromium oxide powder: When the powder passes through the pulverizing chamber of the air-jet pulverizer, it is pulverized by collision, friction, and shearing at the confluence of multiple high-pressure airflows (at this time, an upward rotating airflow is generated in the pulverizing chamber of the air-jet pulverizer). The pulverized fused chromium oxide ultrafine powder rises upward through the pulverizing chamber of the air-jet pulverizer, at which point the drive motor starts to rotate. The drive motor transmits the rotational power to the drive shaft through the coupling. At this time, the drive shaft rotates at high speed around the upper and lower bearings set inside the cooling cylinder, thereby driving the centrifugal classification mechanism. The upper grading disc, fixed ring, grading strips, connecting cylinder, upper guide plate, and lower guide plate rotate at high speed, generating centrifugal force. The small and light fused chromium oxide powder is drawn into the space formed by the upper grading disc, fixed ring, and grading strips through the guiding channel formed by the upper and lower guide plates. The fused chromium oxide powder is further classified by centrifugal rotation. The classified fused chromium oxide powder flows out from the gaps in the grading strips and enters the discharge port. The classified fused chromium oxide powder is then transported to the next process through the discharge port. Different particle sizes of fused chromium oxide powder can be classified by changing the rotation speed of the drive motor. II. Cooling of the Drive Shaft: Under the conditions of long-term high-speed rotation and closed process, the drive shaft is prone to high temperature and heat generation. At this time, the valve core control time of the three-way solenoid directional valve is set by the PLC control module to intermittently switch the opening direction of the three-way solenoid directional valve core. When the valve core opening direction of the three-way solenoid directional valve is connected to the oil inlet pipe, the hydraulic oil pump of the hydraulic station delivers cooling oil to the oil inlet pipe and delivers it to the cooling cylinder through the cooling oil pipe. When the valve core opening direction of the three-way solenoid directional valve is connected to the oil outlet pipe, the hydraulic oil pump of the hydraulic station draws the cooling oil out of the cooling cylinder through the cooling oil pipe. This forms an intermittent control closed loop to realize the intermittent circulation cooling of the cooling oil in the cooling cylinder.

[0013] The beneficial effects of this utility model are as follows: 1. By configuring the first and second grading cylinders, the drive motor, the coupling, the drive shaft, and the centrifugal grading mechanism, the grading and screening efficiency of fused chromium oxide powder is greatly improved. 2. By configuring the cooling oil pipe, oil pipe flange, three-way solenoid directional valve, oil inlet pipe, and oil outlet pipe, both intermittent cyclic cooling and lubrication of the drive shaft and bearings can be achieved, thereby improving the service life of the drive shaft and bearings. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the structure of this utility model;

[0015] Figure 2 This utility model Figure 1 A partial central cross-sectional view of the bottom;

[0016] Figure 3 This utility model Figure 1 Bottom front cross-section;

[0017] Figure 4 This is a schematic diagram of the centrifugal grading mechanism of this utility model;

[0018] The markings in the diagram are: 1. Classification cylinder one, 2. Classification cylinder two, 3. Discharge port, 4. Cooling oil pipe, 5. Oil pipe flange, 6. Three-way solenoid directional valve, 7. Oil inlet pipe, 8. Oil outlet pipe, 9. Lower flange, 10. Upper flange, 11. Conical shell, 12. Drive motor, 13. Coupling, 14. Cooling cylinder, 15. Drive shaft, 16. Bearing, 17. Sealing gasket, 18. Centrifugal classification mechanism, 181. Upper classification disc, 182. Fixing ring, 183. Classification bar, 184. Connecting cylinder, 185. Upper guide plate, 186. Lower guide plate. Detailed Implementation

[0019] The specific embodiments of this utility model will be further described in detail below with reference to the accompanying drawings.

[0020] This utility model provides a centrifugal classification device for airflow pulverization of fused chromium oxide ultrafine powder:

[0021] like Figure 1 , 2 As shown in Figure 3, the first classifier cylinder 1 is fixedly installed at the upper part of the grinding cylinder of the air jet mill, and the second classifier cylinder 2 is fixedly installed at the upper center of the first classifier cylinder 1. The first classifier cylinder 1 and the second classifier cylinder 2 are connected vertically. The first classifier cylinder 1 is a cylindrical shape with an upper opening smaller than a lower opening, and the second classifier cylinder 2 is a hollow cylindrical shape with a lower opening and a closed upper part. The diameter of the second classifier cylinder 2 is smaller than the diameter of the first classifier cylinder 1.

[0022] The above-mentioned arrangement of classification cylinder 1 and classification cylinder 2 utilizes the structural feature that the diameter of classification cylinder 1 is larger than that of classification cylinder 2 to form a centrifugal rotating classification chamber with an upwardly tapering opening. On the one hand, this increases the centrifugal rotation pressure of the fused chromium oxide powder; on the other hand, during the centrifugal rotation classification process, the fused chromium oxide powder with large particle size and heavy weight can be centrifugally thrown onto the inner wall of classification cylinder 1, and then fall back into the grinding chamber of the air jet mill.

[0023] like Figure 1 , 2 As shown in Figure 3, the discharge port 3 is fixedly located at the middle left side of the second classifier cylinder 2, and the discharge port 3 is connected to the interior of the second classifier cylinder 2. The main purpose of this arrangement is to use the discharge port 3 to pneumatically convey the qualified ultrafine fused chromium oxide powder after centrifugal classification to the next process.

[0024] like Figure 1 and3 As shown, the cooling oil pipe 4 is positioned to the right of the discharge port 3. The cooling oil pipe 4 is L-shaped, with one end extending to the center of the second classifier cylinder 2 and the other end extending to the outer right side of the second classifier cylinder 2. The cooling oil pipe 4 is fixed to the outer wall of the second classifier cylinder 2 via the oil pipe flange 5. The three-way solenoid directional valve 6 is fixedly installed on the upper right end of the cooling oil pipe 4. The oil inlet pipe 7 is fixedly installed in the middle right position of the three-way solenoid directional valve 6, and the oil outlet pipe 8 is fixedly installed in the middle front position of the three-way solenoid directional valve 6. The oil inlet pipe 7 and the oil outlet pipe 8 are connected to the interior of the three-way solenoid directional valve 6. The oil inlet pipe 7 is fixedly connected to the oil outlet end of the hydraulic station via a connecting oil pipe, and the oil outlet pipe 8 is fixedly connected to the oil return end of the hydraulic station. The three-way solenoid directional valve 6 is fixedly connected to the PLC control module via a wire.

[0025] The above-mentioned arrangement of cooling oil pipe 4, three-way solenoid directional valve 6, oil inlet pipe 7, and oil outlet pipe 8, along with the intermittent switching control of the valve core of the three-way solenoid directional valve 6 by the PLC control module and the hydraulic pump of the hydraulic station, achieves intermittent cyclic cooling of the drive shaft 15 in the cooling cylinder 14 on the one hand, and lubricates the bearings 16 located at the upper and lower positions inside the cooling cylinder 14 on the other hand.

[0026] like Figure 1 , 2 As shown in Figure 3, the lower flange 9 is located at the bottom of the conical shell 11, and the upper flange 10 is located at the top of the conical shell 11. The bottom of the conical shell 11 is fixedly located at the upper center of the second classifier 2 through the lower flange 9.

[0027] The aforementioned arrangement of the lower flange 9, upper flange 10, and conical shell 11 serves two purposes: firstly, the conical shell 11 can be fixed to the upper part of the second classifier cylinder 2; secondly, the conical shell 11 can protect the coupling 13, preventing dust from entering the coupling 13 and causing damage to it.

[0028] like Figure 2 As shown, the drive motor 12 is fixedly installed at the upper center of the conical shell 11, and the power output shaft of the drive motor 12 extends through the upper flange 10 into the interior of the conical shell 11; the coupling 13 is located at the bottom of the power output shaft of the drive motor 12, the cooling cylinder 14 is fixedly installed at the upper center of the grading cylinder 2, the bearings 16 are symmetrically fixedly installed on the upper and lower inner walls of the cooling cylinder 14, the drive shaft 15 is fixedly installed on the inner ring of the symmetrically installed bearings 16, the upper end of the drive shaft 15 extends to the bottom of the coupling 13 and is fixedly connected to the bottom of the coupling 13, and the lower end of the drive shaft 15 extends to the bottom of the centrifugal grading mechanism 18.

[0029] The main purpose of the above configuration is to use the drive motor 12 to transmit rotational power to the drive shaft 15 through the coupling 13, thereby driving the centrifugal grading mechanism 18 to rotate at high speed.

[0030] like Figure 2 As shown, two gaskets 17 are provided, one installed on the upper part of the bearing 16 at the upper part of the cooling cylinder 14, and the other installed at the bottom of the bearing 16 at the lower part of the cooling cylinder 14. The main purpose of this arrangement is to use the gaskets 17 to form a space for cooling the drive shaft 15 in conjunction with the cooling cylinder 14.

[0031] like Figure 2 , 3 As shown in Figure 4, the centrifugal classification mechanism 18 is fixedly installed at the lower part of the cooling cylinder 14. The centrifugal classification mechanism 18 is used to classify the particle size of ultrafine fused chromium oxide powder by centrifugal rotation. The centrifugal classification mechanism 18 includes an upper classification plate 181, which is fixedly installed near the lower part of the cooling cylinder 14. A fixing ring 182 is installed at the lower part of the cooling cylinder 14. Classification bars 483 are evenly and equally angled around the circumferential sidewalls of the upper classification plate 181 and the fixing ring 182. The upper end of the classification bar 183 is fixed to the circumferential sidewall of the upper classification plate 181, and the lower end of the classification bar 183 is fixed to the circumferential outer sidewall of the fixing ring 182. The connecting cylinder 184 is fixedly installed at the lower end of the drive shaft 15; the upper guide plate 185 is located between the fixing ring 182 and the connecting cylinder 184. The upper guide plate 185 has an irregular polygonal structure. One end of the upper guide plate 185 is fixedly connected to the outer wall of the connecting cylinder 184, and the other end of the upper guide plate 185 is fixed to the bottom of the fixing ring 182. The upper guide plate 185 is evenly and equidistantly arranged around the circumference of the fixing ring 182 and the connecting cylinder 184; the lower guide plate 186 is triangular. The long side end face of the lower guide plate 186 is fixed to the outer wall of the connecting cylinder 184. The lower guide plate 186 is evenly and equidistantly arranged around the outer wall of the connecting cylinder 184.

[0032] The above-mentioned arrangement of the upper grading plate 181, fixing ring 182, grading strip 183, connecting cylinder 184 and upper guide plate 185, combined with the different centrifugal rotation speeds of the drive motor 12, forms a space for grading and screening ultrafine electrofused chromium oxide powder. On the one hand, it realizes the particle size grading and screening of ultrafine electrofused chromium oxide powder; on the other hand, it forms a strong centrifugal rotation force, which generates an upward siphon effect on the ultrafine electrofused chromium oxide powder.

[0033] The aforementioned arrangement of the upper guide plate 185 and lower guide plate 186, under the high-speed centrifugal rotation of the connecting cylinder 184, utilizes the fact that the upper guide plate 185 and lower guide plate 186 are arranged linearly and horizontally to form a guiding channel for guiding and classifying fused chromium oxide powder. This allows the fused chromium oxide powder that needs to be classified and screened to be quickly introduced into the classification and screening space formed by the upper classification plate 181, fixing ring 182, classification strip 183, connecting cylinder 184, and upper guide plate 185, thereby achieving the classification and screening of ultrafine fused chromium oxide powder with qualified particle size, and thus greatly improving the centrifugal classification and screening efficiency of fused chromium oxide powder.

[0034] like Figure 1-4 As shown, the working process of this centrifugal classifier for air-jet pulverized fused chromium oxide ultrafine powder is as follows: 1. Particle size classification of ultrafine fused chromium oxide powder: When the powder passes through the pulverizing chamber of the air-jet pulverizer, it is pulverized by collision, friction, and shearing at the confluence of multiple high-pressure airflows. The pulverized fused chromium oxide ultrafine powder rises upward through the pulverizing chamber of the air-jet pulverizer. At this time, the drive motor 12 starts to rotate. The drive motor 12 transmits the rotational power to the drive shaft 15 through the coupling 13. At this time, the drive shaft 15 rotates at high speed with the upper and lower bearings 16 set inside the cooling cylinder 14 as the rotation center, thereby driving the upper classification disc 181, the fixed ring 182, and the classification strips 183 of the centrifugal classification mechanism 18. The connecting cylinder 184, upper guide plate 185, and lower guide plate 186 rotate at high speed, generating centrifugal force. The small and light fused chromium oxide powder is drawn into the space formed by the upper classifying plate 181, the fixing ring 182, and the classifying strips 183 through the guiding channel formed by the upper guide plate 185 and the lower guide plate 186. The fused chromium oxide powder is further classified by centrifugal rotation. The classified fused chromium oxide powder flows out from the gaps of the classifying strips 183 and enters the discharge port 3. The classified fused chromium oxide powder is then transported to the next process through the discharge port 3. Different particle sizes of fused chromium oxide powder can be classified by changing the rotation speed of the drive motor 12. II. Cooling of the drive shaft: Under the long-term high-speed rotation and closed process conditions of the drive shaft 12, the drive shaft 12 is prone to high temperature and heat generation. At this time, the valve core control time of the three-way solenoid directional valve 6 is set by the PLC control module to intermittently switch the opening direction of the valve core of the three-way solenoid directional valve 6. When the valve core opening direction of the three-way solenoid directional valve 6 is connected to the oil inlet pipe 7, the hydraulic oil pump of the hydraulic station delivers cooling oil to the oil inlet pipe 7, which is then delivered to the cooling cylinder 14 through the cooling oil pipe 4. When the valve core opening direction of the three-way solenoid directional valve 6 is connected to the oil outlet pipe 8, the hydraulic oil pump of the hydraulic station extracts the cooling oil from the cooling cylinder 14 through the cooling oil pipe 4. This forms an intermittent control closed loop to realize the intermittent circulation cooling of the cooling oil in the cooling cylinder 14.

[0035] Various modifications to the above embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the invention. Therefore, the invention is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A centrifugal classifying device for air-jet milling of fused chromium oxide ultrafine powder, comprising a first classifying cylinder, a second classifying cylinder, and a discharge port; the first classifying cylinder is fixedly disposed at the upper part of the milling cylinder of the air-jet mill, and the second classifying cylinder is fixedly disposed at the upper center of the first classifying cylinder, with the first and second classifying cylinders connected vertically; the discharge port is fixedly disposed at the middle left side of the second classifying cylinder, and the discharge port is connected to the interior of the second classifying cylinder; characterized in that: The cooling oil pipe is positioned to the right of the discharge port. The L-shaped cooling oil pipe extends from one end to the center of the second classifier cylinder and from the other end to the outer right side of the second classifier cylinder, where it is fixed to the outer wall via an oil pipe flange. A three-way solenoid directional valve is fixedly installed at the upper right end of the cooling oil pipe. The inlet pipe is fixedly installed at the middle right side of the three-way solenoid directional valve, and the outlet pipe is fixedly installed at the middle front side of the three-way solenoid directional valve. A lower flange is located at the bottom of the conical shell, and an upper flange is located at the top of the conical shell. The bottom of the conical shell is fixedly positioned at the upper center of the second classifier cylinder via the lower flange. The drive motor is fixedly installed at the upper center of the conical shell, and its power output shaft passes through... The upper flange extends into the interior of the conical housing; the coupling is located at the bottom of the drive motor's power output shaft; the cooling cylinder is fixedly located at the upper center of the second classifying cylinder; the bearings are symmetrically fixedly located on the upper and lower inner walls of the cooling cylinder; the drive shaft is fixedly mounted on the inner ring of the symmetrically located bearings; the upper end of the drive shaft extends to the bottom of the coupling and is fixedly connected to the bottom of the coupling; the lower end of the drive shaft extends to the bottom of the centrifugal classifying mechanism; two sealing gaskets are provided, one installed on the upper part of the bearing in the upper part of the cooling cylinder, and the other installed on the bottom of the bearing in the lower part of the cooling cylinder; the centrifugal classifying mechanism is fixedly located at the lower part of the cooling cylinder, and the centrifugal classifying mechanism is used to classify the particle size of ultrafine electrofused chromium oxide powder by centrifugal rotation.

2. The centrifugal classifier for airflow pulverization of fused chromium oxide ultrafine powder according to claim 1, characterized in that: The first grading cylinder is a cylindrical shape with an upper opening smaller than a lower opening, and the second grading cylinder is a hollow cylindrical shape with a lower opening and a closed upper part. The diameter of the second grading cylinder is smaller than the diameter of the first grading cylinder.

3. The centrifugal classifier for airflow pulverization of fused chromium oxide ultrafine powder according to claim 1, characterized in that: The conical shell is concentric with the power output shaft of the drive motor, the second classifier, and the first classifier.

4. The centrifugal classifier for airflow pulverization of fused chromium oxide ultrafine powder according to claim 1, characterized in that: The cooling oil pipe is connected to the interior of the cooling cylinder at the center end of the inner side of the second stage cylinder, and the cooling oil pipe and the cooling cylinder are vertically fixed and connected.

5. A centrifugal classifier for airflow pulverization of fused chromium oxide ultrafine powder according to claim 1, characterized in that: The centrifugal grading mechanism includes an upper grading plate, which is fixedly installed near the lower part of the cooling cylinder, and a fixing ring is located at the lower part of the cooling cylinder. Grading strips are evenly and equally angled around the circumferential sidewalls of the upper grading plate and the fixing ring. The upper end of the grading strip is fixed to the circumferential sidewall of the upper grading plate, and the lower end of the grading strip is fixed to the circumferential outer sidewall of the fixing ring. A connecting cylinder is fixedly installed at the lower end of the drive shaft and is fixedly connected to the bottom of the cooling cylinder. An upper guide plate is located between the fixing ring and the connecting cylinder. The upper guide plate has an irregular polygonal structure. One end of the upper guide plate is fixedly connected to the outer wall of the connecting cylinder, and the other end of the upper guide plate is fixed to the bottom of the fixing ring. The upper guide plate is evenly and equally angled around the circumference of the fixing ring and the connecting cylinder. The lower guide plate is triangular. The long side end face of the lower guide plate is fixed to the outer wall of the connecting cylinder. The lower guide plate is evenly and equally angled around the outer wall of the connecting cylinder.

6. A centrifugal classifier for airflow pulverization of fused chromium oxide ultrafine powder according to claim 5, characterized in that: The upper guide plate and the lower guide plate are arranged horizontally in a linear fashion, forming a guide channel for guiding graded ultrafine electrofused chromium oxide powder.

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