Discharging mechanism for silicon carbide raw material production

Abstract

The invention discloses a discharging mechanism for silicon carbide raw material production, which comprises a storage tank body, a sealing cover plate is fixed on the outer wall of the top of the storage tank body, the inner wall of the bottom of the storage tank body is communicated with a discharging pipe, and a stirring shaft is rotatably mounted at the axis of the sealing cover plate. Stirring blades which are distributed at equal intervals are welded to the outer wall of the stirring shaft in the inclined direction, a first bevel gear is welded to the outer wall of the top of the stirring shaft, and a second bevel gear is in engaged driving with the vertical side of the top of the first bevel gear; in the process of heating and discharging silicon carbide raw materials, a servo motor is used for driving a stirring rod to continuously stir, the raw materials can be heated more uniformly, the situation that heat is non-uniformly dispersed is avoided, auxiliary stirring can be achieved in the discharging process, the flowing speed of the raw materials is increased, and the discharging efficiency of the silicon carbide raw materials is improved. And in cooperation with vibration discharging at the lower portion, the discharging speed can be further increased.

Description

Technical Field

[0001] The invention relates to the technical field of silicon carbide preparation, and in particular to a material feeding mechanism for producing silicon carbide raw materials. Background Art

[0002] Silicon carbide is a synthetic hard crystalline compound composed of silicon and carbon, with many excellent properties. It is widely used for its high strength, high hardness, high elastic modulus, good wear resistance, high thermal conductivity, corrosion resistance and other characteristics. The hardness of silicon carbide is very high, with a Mohs hardness of 9.2 to 9.5, second only to boron carbide and diamond. It decomposes at 2500 degrees under normal pressure, with a relative density of 3.2 to 3.25, a dielectric constant of 7.0, and a resistivity of 102M / CM at room temperature. The thermal conductivity of silicon carbide is very high, about twice that of silicon nitride, and the thermal expansion coefficient is about half that of aluminum oxide. The bending strength is close to that of silicon nitride, but the fracture toughness is smaller than that of silicon nitride. It is insoluble in water and general acid, has good chemical stability, is chemically inert, and does not react with mixed acids of hydrofluoric acid and nitric acid.

[0003] The main method for preparing silicon carbide is the carbon thermal reduction method, which is to mix high-purity silica and petroleum coke and react at 1800-1900 degrees to generate silicon carbide. However, during the heating and feeding process of silica, the particle size is within the F600 particle size range, and the heated fine particle powder cannot flow normally when feeding at high temperature, resulting in the subsequent high-purity silica and petroleum coke mixing reaction cannot proceed normally. In order to ensure that the silicon carbide raw material can be transported and proportioned normally, it is necessary to use an external feeding mechanism to feed the silica at high temperature, but the existing feeding mechanism still has some problems when used:

[0004] 1. Unable to control the flow rate. The existing feeding structure cannot easily control the flow rate during the stirring and feeding of silica at high temperature, which also leads to the mixing of silica and petroleum coke in the next step not being able to reach the optimal state, which has a certain impact on the subsequent operation steps.

[0005] 2. The equipment is prone to overheating. When the existing feeding mechanism is in use, the silica needs to be heated to achieve normal mixing and stirring with petroleum coke. However, the heating temperature of silica is too high, and the feeding mechanism is subjected to high-temperature heat conduction for a long time, which will cause damage to the internal electrical structure, thereby greatly reducing the normal service life of the electrical equipment. Summary of the invention

[0006] The purpose of the present invention is to solve the shortcomings of the prior art and to propose a feeding mechanism for silicon carbide raw material production.

[0007] In order to achieve the above object, the present invention adopts the following technical solutions:

[0008] A feeding mechanism for producing silicon carbide raw materials comprises a storage tank body, a sealing cover plate is fixed to the top outer wall of the storage tank body, and a discharge pipe is connected to the bottom inner wall of the storage tank body, a stirring shaft is rotatably mounted at the axis center of the sealing cover plate, and the outer wall of the stirring shaft is welded with equidistantly distributed stirring blades along the inclined direction, a first bevel gear is welded to the top outer wall of the stirring shaft, and a second bevel gear is meshed and driven on the vertical side of the top of the first bevel gear, a servo motor is connected to the axis center of the second bevel gear, and the servo motor is fixed to a mounting plate by screws, a sliding block is welded to the bottom outer wall of the mounting plate, a feeding conduit is mounted to the bottom outer wall of the storage tank body by screws, and a fixed support plate is welded to the outer wall of the feeding conduit.

[0009] As a further solution of the present invention: a protective shell is arranged outside the storage tank body, and a spiral electric heating ring is sleeved on the outer wall of the storage tank body inside the protective shell.

[0010] As a further solution of the present invention: a cleaning scraper is fixed to the outer wall of the stirring shaft by screws, and the size of the cleaning scraper is adapted to the size of the inner wall of the storage tank body, and the outer wall of the cleaning scraper is in close contact with the inner wall of the storage tank body.

[0011] As a further solution of the present invention: the sliding block is slidably inserted into the inner wall of the sliding track, and a connecting block is welded to the outer wall of one side of the sliding block, and an electric telescopic rod is fixed to one side of the connecting block.

[0012] As a further solution of the present invention: a spiral conveying blade is rotatably connected to the axis of the inner wall of the discharge conduit, and one end of the spiral conveying blade is connected to a driving motor through a coupling.

[0013] As a further solution of the present invention: the size of the spiral conveying blade is matched with the inner wall size of the material discharge conduit, and the length of the spiral conveying blade is matched with the length of the material discharge conduit.

[0014] As a further solution of the present invention: a first pneumatic vibrator is arranged on one side of the fixed support plate, and a second pneumatic vibrator is arranged on the other side of the fixed support plate, and the first pneumatic vibrator and the second pneumatic vibrator are fixedly connected by fixing bolts.

[0015] As a further solution of the present invention: the effective number of teeth of the first helical gear is the same as the effective number of teeth of the second helical gear, and the axis of the first helical gear and the axis of the second helical gear are located in the same vertical plane.

[0016] Compared with the prior art, the present invention provides a feeding mechanism for silicon carbide raw material production, which has the following beneficial effects:

[0017] 1. The production unloading mechanism of this design can effectively improve the flexibility of the unloading mechanism by arranging two sets of detachable pneumatic vibrators on the outer wall of the unloading pipe, and adopts gas flow to control the vibration frequency to realize the flow rate control of the unloading, which can greatly improve the normal progress of the subsequent reaction.

[0018] 2. The production unloading mechanism of this design uses a servo motor to drive the stirring rod for continuous stirring during the process of heating and unloading the silicon carbide raw materials, which can make the raw materials heated more evenly and avoid uneven heat distribution. In addition, auxiliary stirring can be achieved during the unloading process to accelerate the flow rate of the raw materials and avoid internal blockages. Combined with the vibration unloading below, the unloading speed can be further increased.

[0019] 3. The production unloading mechanism of this design is designed to set two detachable bevel gears above the sealing cover plate, so that they can be directly separated during the heating process, avoiding high temperature directly transmitted to the servo motor and causing irreversible damage to the motor, thereby effectively extending the service life of the servo motor.

[0020] The parts not involved in the device are the same as those in the prior art or can be implemented by using the prior art. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 This is a schematic diagram of the overall structure of a material feeding mechanism for producing silicon carbide raw materials proposed by the present invention;

[0022] Figure 2 This is a side view of the overall structure of a material feeding mechanism for producing silicon carbide raw materials proposed by the present invention;

[0023] Figure 3 This is a first-view structural schematic diagram of a material feeding mechanism for producing silicon carbide raw materials proposed by the present invention;

[0024] Figure 4 This is a partial structural schematic diagram of a feeding mechanism for producing silicon carbide raw materials proposed by the present invention.

[0025] In the figure: 1. Storage tank body; 2. Sealing cover plate; 3. Protective shell; 4. Spiral electric heating ring; 5. Discharge pipe; 6. Stirring shaft; 7. Stirring blade; 8. Cleaning scraper; 9. First bevel gear; 10. Second bevel gear; 11. Servo motor; 12. Mounting plate; 13. Sliding block; 14. Sliding track; 15. Connecting block; 16. Electric telescopic rod; 17. Discharge guide tube; 18. Spiral conveying blade; 19. Driving motor; 20. Fixed support plate; 21. First pneumatic vibrator; 22. Second pneumatic vibrator; 23. Fixing bolt. DETAILED DESCRIPTION

[0026] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments.

[0027] Embodiment 1:

[0028] A feeding mechanism for producing silicon carbide raw materials, in this embodiment, as Figure 1-4 As shown, it comprises a material storage tank body 1, a sealing cover plate 2 is fixed to the top outer wall of the material storage tank body 1, a protective shell 3 is arranged outside the material storage tank body 1, and a spiral electric heating ring 4 is sleeved on the outer wall of the material storage tank body 1 located inside the protective shell 3, and a discharge pipe 5 is connected to the bottom inner wall of the material storage tank body 1;

[0029] A stirring shaft 6 is rotatably mounted at the axis of the sealing cover plate 2, and a cleaning scraper 8 is fixed to the outer wall of the stirring shaft 6 by screws, and the size of the cleaning scraper 8 is adapted to the size of the inner wall of the storage tank body 1, and the outer wall of the cleaning scraper 8 is closely attached to the inner wall of the storage tank body 1, and the outer wall of the stirring shaft 6 is welded with equidistantly distributed stirring blades 7 along the inclined direction;

[0030] A first bevel gear 9 is welded to the outer wall of the top of the stirring shaft 6, and a second bevel gear 10 is meshed and driven on one vertical side of the top of the first bevel gear 9. A servo motor 11 is connected to the axis of the second bevel gear 10, and the servo motor 11 is fixed to the mounting plate 12 by screws.

[0031] By arranging two groups of detachable pneumatic vibrators on the outer wall of the discharge pipe 5, wherein the specific model of the first pneumatic vibrator 21 is the pneumatic vibrator NTP25, and the specific model of the second pneumatic vibrator 22 is the pneumatic vibrator NTP32, the two control the gas flow rate to control the vibration frequency, thereby controlling the flow rate, and can effectively improve the flexibility of the unloading mechanism, thereby greatly improving the normal progress of the subsequent reaction;

[0032] A sliding block 13 is welded to the outer wall of the bottom of the mounting plate 12, and the sliding block 13 is slidably plugged into the inner wall of the sliding track 14, and a connecting block 15 is welded to the outer wall of one side of the sliding block 13, and an electric telescopic rod 16 is fixed to one side of the connecting block 15. A material discharge conduit 17 is installed on the outer wall of the bottom of the storage tank body 1 by screws, and a fixed support plate 20 is welded to the outer wall of the material discharge conduit 17;

[0033] In the process of heating and unloading the silicon carbide raw material, the servo motor 11 is used to drive the stirring rod to continuously stir, so that the raw material can be heated more evenly, avoiding the situation of uneven heat dispersion, and auxiliary stirring can be achieved in the process of unloading, accelerating the flow rate of the raw material, avoiding the situation of internal blockage, and cooperating with the vibration unloading below, the unloading speed can be further increased;

[0034] The size of the spiral conveying blade 18 is adapted to the inner wall size of the discharge conduit 17, and the length of the spiral conveying blade 18 is adapted to the length of the discharge conduit 17. The spiral conveying blade 18 is rotatably connected to the inner wall axis of the discharge conduit 17, and one end of the spiral conveying blade 18 is connected to a driving motor 19 through a coupling.

[0035] When this embodiment is used, first pour the silicon carbide raw material that needs to be heated and unloaded into the interior of the storage tank body 1, then cover it with the sealing cover plate 2, connect the unloading mechanism to the external power supply for power supply treatment, first start the spiral electric heating ring 4 to heat the interior of the storage tank body 1, then extend the electric telescopic rod 16, mesh the servo motor 11 connected to the second bevel gear 10 with the first bevel gear 9, and then drive the stirring shaft 6 to rotate, and the paddle 7 inside it also starts to rotate, so as to stir the silicon carbide raw material inside, ensuring that the internal raw material The heating treatment can be evenly achieved. When the heated silicon carbide raw material needs to be unloaded, the drive motor 19 is started first, and the spiral conveying blade 18 is driven to rotate by the drive motor 19, and the first pneumatic vibrator 21 of the pneumatic vibrator NTP25 is started, and the second pneumatic vibrator 22 of the pneumatic vibrator NTP32 is also started. The vibration frequency is controlled by controlling the gas flow rate to achieve orderly unloading of the high-temperature silicon carbide raw material, and the fallen silicon carbide raw material enters the spiral conveying blade 18, which can achieve even transportation.

[0036] Embodiment 2:

[0037] A feeding mechanism for producing silicon carbide raw materials, such as Figure 1-3 As shown, the present embodiment is supplemented as follows on the basis of the embodiment 1: a first pneumatic vibrator 21 is provided on one side of the fixed support plate 20, and a second pneumatic vibrator 22 is provided on the other side of the fixed support plate 20, the first pneumatic vibrator 21 and the second pneumatic vibrator 22 are fixedly connected by a fixing bolt 23, the effective number of teeth of the first bevel gear 9 is the same as the effective number of teeth of the second bevel gear 10, and the axis of the first bevel gear 9 and the axis of the second bevel gear 10 are located in the same vertical plane;

[0038] When this embodiment is used, two detachable bevel gears are arranged above the sealing cover plate 2 so that they can be directly separated during the heating process, thereby preventing high temperature from being directly transferred to the servo motor 11 and causing irreversible damage to the motor, thereby effectively extending the service life of the servo motor 11.

[0039] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical scheme and inventive concept of the present invention within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A material feeding mechanism for silicon carbide raw material production, comprising a material storage tank (1), characterized in that: A sealing cover plate (2) is fixed to the top outer wall of the storage tank body (1), and a discharge pipe (5) is connected to the bottom inner wall of the storage tank body (1). A stirring shaft (6) is rotatably mounted at the axis of the sealing cover plate (2), and the outer wall of the stirring shaft (6) is welded with equidistantly distributed stirring blades (7) along the inclined direction. A first bevel gear (9) is welded to the top outer wall of the stirring shaft (6), and a second bevel gear (10) is meshed and driven on the top vertical side of the first bevel gear (9). A servo motor (11) is connected to the axis of the second bevel gear (10), and the servo motor (11) is fixed to the mounting plate (12) by screws. A sliding block (13) is welded to the bottom outer wall of the mounting plate (12). A discharge conduit (17) is mounted to the bottom outer wall of the storage tank body (1) by screws, and a fixed support plate (20) is welded to the outer wall of the discharge conduit (17).

2. A feeding mechanism for producing silicon carbide raw materials according to claim 1, characterized in that: A protective shell (3) is provided outside the material storage tank body (1), and a spiral electric heating ring (4) is sleeved on the outer wall of the material storage tank body (1) inside the protective shell (3).

3. A feeding mechanism for producing silicon carbide raw materials according to claim 1, characterized in that: A cleaning scraper (8) is fixed to the outer wall of the stirring shaft (6) by screws, and the size of the cleaning scraper (8) is compatible with the size of the inner wall of the storage tank body (1), and the outer wall of the cleaning scraper (8) is in close contact with the inner wall of the storage tank body (1).

4. A feeding mechanism for producing silicon carbide raw materials according to claim 1, characterized in that: The sliding block (13) is slidably inserted into the inner wall of the sliding track (14), and a connecting block (15) is welded to the outer wall of one side of the sliding block (13), and an electric telescopic rod (16) is fixed to one side of the connecting block (15).

5. The feeding mechanism for producing silicon carbide raw materials according to claim 1, characterized in that: A spiral conveying blade (18) is rotatably connected to the axis of the inner wall of the material discharge conduit (17), and one end of the spiral conveying blade (18) is connected to a driving motor (19) via a coupling.

6. A feeding mechanism for producing silicon carbide raw materials according to claim 5, characterized in that: The size of the spiral conveying blade (18) is matched with the inner wall size of the material discharge conduit (17), and the length of the spiral conveying blade (18) is matched with the length of the material discharge conduit (17).

7. A feeding mechanism for producing silicon carbide raw materials according to claim 1, characterized in that: A first pneumatic vibrator (21) is provided on one side of the fixed support plate (20), and a second pneumatic vibrator (22) is provided on the other side of the fixed support plate (20); the first pneumatic vibrator (21) and the second pneumatic vibrator (22) are fixedly connected via fixing bolts (23).

8. The material feeding mechanism for producing silicon carbide raw materials according to claim 1, characterized in that: The effective number of teeth of the first bevel gear (9) is the same as the effective number of teeth of the second bevel gear (10), and the axis of the first bevel gear (9) and the axis of the second bevel gear (10) are located in the same vertical plane.

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