Silicon carbide particle fine powder processing equipment

Abstract

The utility model discloses silicon carbide particle fine powder processing equipment which comprises a crushing chamber, a flow dividing pipeline, a conveying air pipe, an air pressure pipeline and a first-stage grading chamber, the flow dividing pipeline is communicated with the crushing chamber through the conveying air pipe and connected with the air pressure pipeline, the first-stage grading chamber is arranged at the top of the crushing chamber, and a feeding port is formed in one side of the crushing chamber. A grading device is arranged in the first-stage grading chamber; and the grading device comprises a centrifugal rotor, a mounting seat and a driving device, the centrifugal rotor is rotatably mounted in the first-stage grading chamber through the mounting seat, and the driving device capable of driving the centrifugal rotor to rotate is mounted on one side of the first-stage grading chamber. According to the silicon carbide particle fine powder processing equipment, particles with centrifugal force larger than centripetal force are subjected to primary grading through the centrifugal rotor and then subjected to secondary grading on the grading net after falling down, the screened particles are blown under the action of airflow, enter the airflow and are converged to continue to be impacted and collided to be broken, and the purpose of secondary screening is achieved.

Description

Technical Field

[0001] This utility model relates to a wide range of applications, specifically a silicon carbide particle fine powder processing equipment. Background Technology

[0002] Silicon carbide, an inorganic compound with the chemical formula SiC, is produced by smelting raw materials such as quartz sand, petroleum coke (or coal coke), and sawdust (salt needs to be added when producing green silicon carbide) at high temperatures in an electric resistance furnace. Silicon carbide is a semiconductor that exists in nature in the form of the extremely rare mineral moissanite.

[0003] Currently, air jet mills are used to grind particles of different particle sizes (up to 12 grades) into ultrafine particles by selecting appropriate air pressure and feed rate parameters. According to Chinese patent number 202221303295.6, an air jet mill can simultaneously classify and screen silicon carbide through a negative pressure system connected to the mill barrel after crushing. This requires multiple grinding chambers and related preparation devices to achieve this function, resulting in high cost, high energy consumption, and cumbersome control, requiring adjustment of the negative pressure value. To address the need for only two classification stages, this paper proposes technical improvements to existing air jet mill devices, simplifying the device, system, and classification process. Utility Model Content

[0004] The purpose of this invention is to provide a silicon carbide particle fine powder processing equipment to solve the problems mentioned in the background art.

[0005] To achieve the above objectives, this utility model provides the following technical solution:

[0006] A silicon carbide particle fine powder processing equipment includes a crushing chamber, a diversion pipeline, a conveying air pipe, a pneumatic pipeline, and a primary classification chamber. The diversion pipeline is connected to the crushing chamber through the conveying air pipe and is connected to the pneumatic pipeline. The primary classification chamber is located on the top of the crushing chamber, and a feed inlet is provided on one side of the crushing chamber. A classification device is provided inside the primary classification chamber.

[0007] The grading device includes a centrifugal rotor, a mounting base, and a drive device. The centrifugal rotor is rotatably mounted inside the primary grading chamber via the mounting base, and a drive device capable of driving the centrifugal rotor to rotate is installed on one side of the primary grading chamber.

[0008] The drive unit includes a drive motor, a drive wheel, a driven wheel, and a transmission shaft. The drive wheel is installed at the output end of the drive motor, and the driven wheel is installed on one side of the centrifugal rotor via the transmission shaft. The drive wheel and the driven wheel are connected by a belt drive.

[0009] As a further embodiment of this utility model: the centrifugal rotor is provided with a gap for screening and crushing fine powder particles, one end of the centrifugal rotor is connected to the discharge pipe, the centrifugal rotor and the mounting base are rotatably connected by bearings, and the mounting base is fixed to the crushing chamber by bolts.

[0010] As a further improvement of this utility model: a secondary grading chamber is provided at the bottom of the pulverizing chamber;

[0011] The secondary grading chamber includes a hopper, a discharge valve, a grading screen, and an air blowing pipe. The hopper is connected to the bottom of the crushing chamber, and a grading screen is installed between the hopper and the crushing chamber. A discharge valve is installed at the discharge end of the hopper, and an air blowing pipe connected to the diversion pipeline is installed at the bottom of the grading screen.

[0012] As a further improvement of this utility model: the grading mesh is inverted cone shape and has mesh holes, and particles smaller than the mesh holes fall into the silo for storage.

[0013] As a further improvement of this utility model, the air blowing pipe is equipped with a valve to control the airflow.

[0014] Compared with the prior art, the beneficial effects of this utility model are:

[0015] This silicon carbide particle fine powder processing equipment uses a centrifugal rotor to perform primary classification of particles whose centrifugal force is greater than their centripetal force. After falling, the particles are classified a second time on a classification screen. The screened particles are blown by air under the action of airflow and enter the airflow confluence to continue to impact and collide and break them, thus achieving the purpose of secondary screening. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of a silicon carbide particle fine powder processing equipment.

[0017] Figure 2 A front view of the structure of a silicon carbide particle fine powder processing equipment;

[0018] Figure 3 A cross-sectional view of a grading device in a silicon carbide particle fine powder processing equipment;

[0019] Figure 4 This is a schematic diagram of the drive device in a silicon carbide particle fine powder processing equipment.

[0020] Figure 5 This is a schematic diagram of the structure of a centrifugal rotor in a silicon carbide particle fine powder processing equipment.

[0021] In the diagram: 1. Crushing chamber; 2. Diversion pipeline; 3. Conveying air pipe; 4. Air pressure pipeline; 5. Primary classification chamber; 6. Drive unit; 601. Drive motor; 602. Drive wheel; 603. Driven wheel; 604. Transmission shaft; 7. Mounting base; 8. Air blowing pipe; 9. Hopper; 10. Discharge valve; 11. Classification screen; 12. Feed inlet; 13. Centrifugal rotor; 14. Bearing; 15. Discharge pipe. Detailed Implementation

[0022] Please see Figures 1-5 In this embodiment of the utility model, the silicon carbide particle fine powder processing equipment includes a crushing chamber 1, a diversion pipeline 2, a conveying air pipe 3, a pneumatic pipeline 4, and a primary classification chamber 5. The diversion pipeline 2 is connected to the crushing chamber 1 through the conveying air pipe 3 and is connected to the pneumatic pipeline 4. The primary classification chamber 5 is located on the top of the crushing chamber 1. A feed inlet 12 is provided on one side of the crushing chamber 1. A classification device is provided inside the primary classification chamber 5.

[0023] The grading device includes a centrifugal rotor 13, a mounting base 7, and a drive device 6. The centrifugal rotor 13 is rotatably mounted inside the primary grading chamber 5 via the mounting base 7, and a drive device 6 capable of driving the centrifugal rotor 13 to rotate is installed on one side of the primary grading chamber 5.

[0024] The drive unit 6 includes a drive motor 601, a drive wheel 602, a driven wheel 603, and a transmission shaft 604. The drive wheel 602 is installed at the output end of the drive motor 601. The driven wheel 603 is installed on one side of the centrifugal rotor 13 via the transmission shaft 604. The drive wheel 602 and the driven wheel 603 are connected by a belt drive. The pneumatic pipeline 4 is connected to a high-pressure air source. Compressed air is injected at high speed into the crushing chamber 1 through the air delivery pipe 3, causing the material to accelerate in the supersonic jet stream and impact and collide at the confluence of the nozzles, achieving the purpose of crushing. The crushed material enters the primary classification chamber 5 with the rising airflow. The drive unit 6 drives the centrifugal rotor 13 to rotate at high speed. One end of the rotor 13 is connected to a bag filter and a cyclone collector. The bag filter and cyclone collector are existing technologies used to collect fine powder carried in the output gas of the airflow mill. The bag filter and cyclone collector generate negative pressure through a fan, which introduces the airflow and powder into the centrifugal rotor 13 for recycling. During this process, the particles receive centrifugal force generated by the rotation of the centrifugal rotor 13 in the primary classification chamber 5, and centripetal force generated by the viscosity of the airflow station. Particles with centrifugal force greater than centripetal force fall and continue to impact and collide at the intersection. Powder with centripetal force greater than centrifugal force enters the centrifugal rotor 13 and is drawn out, achieving primary screening.

[0025] In a preferred embodiment, the centrifugal rotor 13 is provided with slits for screening and crushing fine powder particles. One end of the centrifugal rotor 13 is connected to the discharge pipe 15. The centrifugal rotor 13 and the mounting base 7 are rotatably connected by a bearing 14. The mounting base 7 is fixed to the crushing chamber 1 by bolts. The size of the slits for fine powder particles provided inside the centrifugal rotor 13 can effectively prevent large particles from entering the centrifugal rotor 13 and being carried out by the airflow. The discharge pipe 15 is connected to a bag filter and a cyclone collector. The negative pressure generated by the bag filter and the cyclone collector sucks them out.

[0026] In a preferred embodiment, a secondary classification chamber is provided at the bottom of the pulverizing chamber 1;

[0027] The secondary grading chamber includes a hopper 9, a discharge valve 10, a grading screen 11, and an air blow pipe 8. The hopper 9 is connected to the bottom of the crushing chamber 1. The grading screen 11 is installed between the hopper 9 and the crushing chamber 1. The discharge valve 10 is installed at the discharge end of the hopper 9. The air blow pipe 8, which is connected to the diversion pipeline 2, is installed at the bottom of the grading screen 11. The supersonic jet is accelerated and impacts and collides at the confluence of the nozzles, so the airflow is sprayed out in a bundle. The falling material will fall from the dead corner of the airflow to skip the confluence and settle at the bottom. In this application, a grading screen 11 is installed at the bottom. The grading screen 11 can screen out particles whose centrifugal force is greater than the centripetal force, but which do not need to continue to impact and collide, and let them fall to the bottom, thus achieving the purpose of two-stage screening. The particles that fall to the bottom and are filtered by the grading screen 11 are carried by the airflow blown out by the air blow pipe 8 and continue to impact and collide at the confluence, upgrading from the original three-bundle airflow confluence to four-bundle airflow confluence, avoiding particle deposition and improving crushing efficiency.

[0028] In a preferred embodiment, the grading mesh 11 is inverted cone shape and has mesh openings. Particles smaller than the mesh openings fall into the hopper 9 for storage. The air blowing pipe 8 is equipped with a valve to control the airflow. The airflow output from the air blowing pipe 8 is regulated by the valve.

[0029] It should be noted that all the above embodiments belong to the same utility model concept, and the descriptions of each embodiment have different focuses. Where the description in a particular embodiment is not detailed, please refer to the description in other embodiments.

[0030] The embodiments described above merely illustrate the implementation of this utility model, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the utility model patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this utility model, and these all fall within the protection scope of this utility model. Therefore, the protection scope of this utility model patent should be determined by the appended claims.

Claims

1. A silicon carbide particle fine powder processing equipment, comprising a crushing chamber (1), a diversion pipeline (2), a conveying air pipe (3), a pneumatic pipeline (4), and a primary classification chamber (5), wherein the diversion pipeline (2) is connected to the crushing chamber (1) through the conveying air pipe (3), the diversion pipeline (2) is connected to the pneumatic pipeline (4), the primary classification chamber (5) is located at the top of the crushing chamber (1), and a feed inlet (12) is provided on one side of the crushing chamber (1), characterized in that, The primary grading chamber (5) is equipped with a grading device. The grading device includes a centrifugal rotor (13), a mounting base (7) and a drive device (6). The centrifugal rotor (13) is rotatably mounted inside the primary grading chamber (5) via the mounting base (7), and a drive device (6) capable of driving the centrifugal rotor (13) to rotate is installed on one side of the primary grading chamber (5). The drive device (6) includes a drive motor (601), a drive wheel (602), a driven wheel (603), and a transmission shaft (604). The drive wheel (602) is installed at the output end of the drive motor (601), and the driven wheel (603) is installed on one side of the centrifugal rotor (13) via the transmission shaft (604). The drive wheel (602) and the driven wheel (603) are connected by a belt drive.

2. The silicon carbide particle fine powder processing equipment according to claim 1, characterized in that, The centrifugal rotor (13) is provided with a gap for screening and crushing fine powder particles. One end of the centrifugal rotor (13) is connected to the discharge pipe (15). The centrifugal rotor (13) and the mounting base (7) are rotatably connected by a bearing (14). The mounting base (7) is fixed to the crushing chamber (1) by bolts.

3. The silicon carbide particle fine powder processing equipment according to claim 1, characterized in that, The bottom of the pulverizing chamber (1) is provided with a secondary grading chamber; The secondary grading chamber includes a hopper (9), a discharge valve (10), a grading mesh (11), and an air blowing pipe (8). The hopper (9) is connected to the bottom of the crushing chamber (1). A grading mesh (11) is provided between the hopper (9) and the crushing chamber (1). The discharge valve (10) is installed at the discharge end of the hopper (9). An air blowing pipe (8) connected to the diversion pipeline (2) is installed at the bottom of the grading mesh (11).

4. The silicon carbide particle fine powder processing equipment according to claim 3, characterized in that, The grading mesh (11) is inverted cone shape and has mesh holes. Particles smaller than the mesh holes fall into the silo (9) for storage.

5. The silicon carbide particle fine powder processing equipment according to claim 3, characterized in that, The air blowing pipe (8) is equipped with a valve to control the airflow.

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