Raw material preheating device for silicon carbide production

Abstract

The utility model relates to the technical field of silicon carbide production, and provides a raw material preheating device for silicon carbide production. The screening part is arranged on one side of the furnace body; the upper tray is arranged in the upper furnace chamber in a sliding manner, and the upper tray is used for bearing large-particle materials screened by the screening part; the lower tray is arranged in the lower furnace chamber in a sliding manner and is used for receiving small-particle materials screened by the screening part; the uniform distribution piece is arranged on the furnace body and is used for flatly laying materials on the upper tray and the lower tray; and the heating piece is arranged in the upper furnace chamber and the lower furnace chamber. By means of the technical scheme, the problem that in the prior art, raw material particles with different sizes are prone to being heated unevenly is solved.

Description

Technical Field

[0001] The utility model relates to the technical field of silicon carbide production, and specifically to a raw material preheating device for silicon carbide production. Background Art

[0002] Silicon carbide is a semiconductor that exists in nature in the form of the extremely rare mineral moissanite. Since 1893, it has been mass-produced as powder and crystals for use as abrasives, etc. Among non-oxide high-tech refractory raw materials such as C, N, and B, silicon carbide is the most widely used and economical one, which can be called corundum or refractory sand. The production of silicon carbide usually requires a high temperature environment, but because the raw material quartz sand for silicon carbide production is usually uneven in size, it is easy to produce local high temperatures and melt when heated, which seriously affects the discharge and quality.

[0003] In actual production, a production method of preheating first and then heating is usually adopted to achieve continuous production. However, the existing preheating device is prone to uneven heating when faced with raw material particles of different sizes, and cannot meet the needs of continuous production. Utility Model Content

[0004] The utility model provides a raw material preheating device for silicon carbide production, which solves the problem in the related art that raw material particles of different sizes are prone to uneven heating.

[0005] The technical solution of the utility model is as follows:

[0006] A raw material preheating device for silicon carbide production, comprising:

[0007] A furnace body, comprising an upper furnace cavity and a lower furnace cavity;

[0008] A screening element is arranged on one side of the furnace body;

[0009] An upper tray is slidably disposed in the upper furnace cavity, and the upper tray is used to carry materials with larger particles screened by the screening element;

[0010] A lower tray is slidably disposed in the lower tray, and the lower tray is used to receive materials with smaller particles screened by the screening element;

[0011] A uniform distribution member, arranged on the furnace body, and used to spread the material flat on the upper tray and the lower tray;

[0012] A heating element is arranged in the upper furnace cavity and the lower furnace cavity.

[0013] As a further technical solution, the heating element comprises:

[0014] A heating plate, arranged on the side walls of the upper furnace cavity and the lower furnace cavity;

[0015] A blower fan is arranged in the upper furnace cavity, and is used to make hot air flow.

[0016] As a further technical solution, the bottom of the upper tray has a plurality of ventilation holes.

[0017] As a further technical solution, the screening element comprises:

[0018] A screen frame is arranged on the furnace body;

[0019] A sieve drum is rotatably arranged on the sieve frame, and a side wall of the sieve drum has a plurality of sieve holes;

[0020] The first driving member is arranged on the screen frame, and is used for driving the screen drum to rotate.

[0021] As a further technical solution, the sieve frame covers the sieve cylinder, and a material drop hole is provided at the bottom of the sieve frame, and the lower tray is located below the material drop hole after sliding.

[0022] As a further technical solution, the sieve drum is arranged tilted, and the side of the sieve drum close to the furnace body is lower than the side away from the furnace body.

[0023] As a further technical solution, the uniform distribution member includes:

[0024] A second driving member is arranged on the furnace body;

[0025] A gear is rotatably disposed on the furnace body, and the second driving member is used to drive the gear to rotate;

[0026] a chain, arranged on the gear;

[0027] A scraper is arranged on the chain, and the scraper moves along the track of the chain. When the scraper moves above the track of the chain, the bottom of the scraper abuts against the top of the upper tray.

[0028] As a further technical solution, the uniform distribution member further comprises:

[0029] A vibrating member is arranged on the lower tray, and is used to spread the materials dropped into the lower tray.

[0030] The working principle of the utility model is:

[0031] The commonly used raw material for producing silicon carbide in the utility model is quartz sand. Common quartz sand is usually uneven in size, so it is not evenly heated. When the device is in use, the raw material is placed in the screening element for screening. The finer particles will be screened by the screening element and received by the lower tray at the bottom, while the larger particles will be received by the upper tray. The upper and lower trays will enter the upper furnace cavity and the lower furnace cavity respectively for separate processing. Separating large particles from small particles can perform corresponding processing for different particle sizes to ensure more sufficient preheating. At the same time, the uniform distribution element can evenly spread the materials in the upper tray and the lower tray to ensure that the material will not be too thick to cause excessive local temperature, thereby improving the quality of preheating. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] The preferred implementation modes will be described below in a clear and understandable manner with reference to the accompanying drawings to further illustrate the above-mentioned characteristics, technical features, advantages and implementation methods of the present utility model.

[0033] Figure 1 It is a schematic diagram of the structure of the utility model;

[0034] Figure 2 This is a cross-sectional view of the structure of the utility model;

[0035] In the figure: 1, furnace body, 110, upper furnace cavity, 120, lower furnace cavity, 2, screening element, 310, upper tray, 320, lower tray, 4, uniform distribution element, 5, heating element, 510, heating plate, 520, blower fan, 311, ventilation hole, 210, screen frame, 220, screen cylinder, 221, screen hole, 230, first driving element, 211, drop hole, 410, second driving element, 420, gear, 430, chain, 440, scraper, 450, vibrating element. DETAILED DESCRIPTION

[0036] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the specific implementation methods of the utility model will be described below with reference to the accompanying drawings. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, they can also be understood as further technical solutions without paying creative work. In some figures, components with the same structure or function are only schematically illustrated, or only one of them is marked. In this article, "one" not only means "only one", but also means "more than one", and "several" includes "two" and "more than two".

[0037] In this article, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in this utility model can be understood according to specific circumstances.

[0038] In addition, in the description of the present application, the terms "first", "second", etc. are only used to distinguish the description and cannot be understood as indicating or implying relative importance.

[0039] Reference Figure 1~Figure 2 , which is the first embodiment of the utility model, proposes a raw material preheating device for silicon carbide production, including: a furnace body 1 having an upper furnace chamber 110 and a lower furnace chamber 120; a screening element 2 is arranged on one side of the furnace body 1; an upper tray 310 is slidably arranged in the upper furnace chamber 110, and the upper tray 310 is used to carry materials with larger particles screened by the screening element 2; a lower tray 320 is slidably arranged in the lower tray 320, and the lower tray 320 is used to receive materials with smaller particles screened by the screening element 2; a uniform distribution element 4 is arranged on the furnace body 1, and the uniform distribution element 4 is used to spread the materials flatly on the upper tray 310 and the lower tray 320; a heating element 5 is arranged in the upper furnace chamber 110 and the lower furnace chamber 120.

[0040] In this embodiment, the raw material commonly used in the production of silicon carbide is quartz sand. Common quartz sand is usually uneven in size, so it is not evenly heated. When the device is in use, the raw material is placed in the screening element 2 for screening. The finer particles will be screened by the screening element 2 and received by the lower tray 320 at the bottom, while the larger particles will be received by the upper tray 310. The upper tray 310 and the lower tray 320 will enter the upper furnace chamber 110 and the lower furnace chamber 120 respectively for separate processing. Separating large particles from small particles can be processed accordingly for different particle sizes, ensuring more sufficient preheating. At the same time, the uniform distribution member 4 can evenly spread the materials in the upper tray 310 and the lower tray 320, ensuring that the materials will not be too thick and cause local excessive temperature, thereby improving the quality of preheating.

[0041] Furthermore, the heating element 5 includes: a heating plate 510 disposed on the side walls of the upper oven cavity 110 and the lower oven cavity 120; and a blower fan 520 disposed in the upper oven cavity 110, and the blower fan 520 is used to make hot air flow.

[0042] In this embodiment, the heating plate 510 is placed on the four walls of the furnace body 1, and the heating plates 510 in the upper furnace cavity 110 and the lower furnace cavity 120 are controlled separately. In actual production, the temperatures of the two places can be preset respectively to adapt to materials of different substances or different particles. The blower fan 520 is arranged in the upper furnace cavity 110. The blower fan 520 blows the heat of the heating plate 510 to form hot air. The materials in the upper furnace cavity 110 are all larger particles remaining after screening by the screening element 2. Therefore, the blower fan 520 will not cause the materials to be blown due to blowing. At the same time, the blower fan 520 blowing hot air into the materials can also ensure that the materials are heated more evenly, thereby improving the preheating effect and shortening the preheating time.

[0043] Furthermore, the upper tray 310 has a plurality of ventilation holes 311 at the bottom.

[0044] In this embodiment, the raw materials received by the upper tray 310 are all raw materials with larger particles, which are more difficult to completely heat. Therefore, the temperature in the upper furnace chamber 110 will be slightly higher than that in the lower furnace chamber 120 to ensure that the materials are heated. The blower fan 520 will also work at the same time to blow the hot air through the materials on the upper tray 310 and the ventilation holes 311 at the bottom, ensuring that the materials at the bottom of the tray can also be heated up immediately, and also ensuring that the hot air has space to pass through the tray into the materials, thereby ensuring uniform heating.

[0045] Furthermore, the screening element 2 comprises: a screen frame 210 disposed on the furnace body 1; a screen drum 220 rotatably disposed on the screen frame 210, and a side wall of the screen drum 220 has a plurality of screen holes 221; a first driving element 230 disposed on the screen frame 210, and the first driving element 230 is used to drive the screen drum 220 to rotate.

[0046] In this embodiment, after the material is placed in the screen drum 220, the first driving member 230 will drive the screen drum 220 to rotate to ensure that the material is completely screened. The screen frame 210 is covered around the screen drum 220 to prevent the screened small particles from flying out of the screening member 2, thereby ensuring the safety of the operator and also ensuring that no material is wasted, saving production costs and cleaning time.

[0047] Furthermore, the sieve frame 210 covers the sieve cylinder 220 , and a material drop hole 211 is provided at the bottom of the sieve frame 210 , and the lower tray 320 is located below the material drop hole 211 after sliding.

[0048] In this embodiment, the drop hole 211 at the bottom of the screen frame 210 can ensure that all the small particles screened out are blocked by the screen frame 210 and all fall through the drop hole 211 and fall onto the supporting member under the drop hole 211, ensuring that no material is wasted.

[0049] Furthermore, the sieve drum 220 is tilted, and the side of the sieve drum 220 close to the furnace body 1 is lower than the side away from the furnace body 1 .

[0050] In this embodiment, the screen drum 220 and the screen frame 210 are placed at an angle. When placing the raw materials, the materials are fed on the higher side. The first driving member 230 drives the screen drum 220 to rotate, and the small particles in the material are screened out. At the same time, the screen frame 210 protects the screen drum 220 to prevent the small particles screened out from the screen drum from falling to the ground, causing the site to be messy. Large particles cannot fly out of the screen drum 220, and will reach the other end of the screen drum 220 under the rotation of the screen drum 220 and be received by the receiving member. Through simple tilting, the discharge operation can be completed automatically, saving energy consumption, and ensuring the normal screening. It also saves manufacturing costs.

[0051] Furthermore, the uniform distribution member 4 includes: a second driving member 410 is arranged on the furnace body 1; a gear 420 is rotatably arranged on the furnace body 1, and the second driving member 410 is used to drive the gear 420 to rotate; a chain 430 is arranged on the gear 420; a scraper 440 is arranged on the chain 430, and the scraper 440 moves along the trajectory of the chain 430. When the scraper 440 runs above the trajectory of the chain 430, the bottom of the scraper 440 abuts against the top of the upper tray 310.

[0052] In this embodiment, the second driving member 410 drives the transmission member to rotate. After the transmission member rotates, the chain 430 will be driven by the transmission member. Under the action of the chain 430, the scraper 440 will continue to scrape along the set track, and always in one direction. The transmission form of the chain 430 can not only ensure the circulation operation of the scraper 440, but also when the scraper 440 is actually working, it always scrapes from the side close to the screening element 2 to the side of the principle screening element 2, thereby preventing the scraper 440 from scraping the material out of the receiving member when the material is accumulated on one side due to the screening element 2, thereby ensuring that the material will not be wasted.

[0053] Furthermore, the uniform distribution member 4 further includes: a vibration member 450 disposed on the lower tray 320 , and the vibration member 450 is used to spread the materials falling into the lower tray 320 .

[0054] In this embodiment, when the supporting member in the lower furnace chamber 120 receives the material, it may not be able to spread it flat due to the limitations of the screening member 2. The vibrating member 450 is used to continuously vibrate the supporting member to ensure that small particles of material can be evenly spread to the bottom of the supporting member after falling into the supporting member, thereby preventing local material accumulation from being too thick, resulting in uneven heating or excessive temperature rise.

[0055] It should be noted that the above embodiments are only used to illustrate the technical solution of the utility model rather than to limit it. Although the utility model has been described in detail with reference to the preferred embodiments, ordinary technicians in the field should understand that the technical solution of the utility model can be modified or replaced by equivalents without departing from the spirit and scope of the technical solution of the utility model, which should be included in the scope of the claims of the utility model.

Claims

1. A raw material preheating device for silicon carbide production, characterized in that: include: A furnace body (1) having an upper furnace chamber (110) and a lower furnace chamber (120); A screening element (2) is arranged on one side of the furnace body (1); an upper tray (310) slidably disposed in the upper furnace cavity (110), the upper tray (310) being used to carry materials with larger particles screened by the screening element (2); A lower tray (320) is slidably disposed inside the lower tray (320), and the lower tray (320) is used to receive materials with smaller particles screened by the screening element (2); a uniform distribution member (4) disposed on the furnace body (1), the uniform distribution member (4) being used to spread the material evenly on the upper tray (310) and the lower tray (320); A heating element (5) is arranged in the upper furnace cavity (110) and the lower furnace cavity (120).

2. A raw material preheating device for silicon carbide production according to claim 1, characterized in that: The heating element (5) comprises: A heating plate (510) is arranged on the side walls of the upper furnace cavity (110) and the lower furnace cavity (120); A blower fan (520) is disposed in the upper furnace cavity (110), and the blower fan (520) is used to make hot air flow.

3. A raw material preheating device for silicon carbide production according to claim 1, characterized in that: The bottom of the upper tray (310) is provided with a plurality of ventilation holes (311).

4. A raw material preheating device for silicon carbide production according to claim 1, characterized in that: The screening element (2) comprises: A screen frame (210) is arranged on the furnace body (1); A sieve cylinder (220) is rotatably disposed on the sieve frame (210), and a side wall of the sieve cylinder (220) has a plurality of sieve holes (221); A first driving member (230) is disposed on the screen frame (210), and the first driving member (230) is used to drive the screen drum (220) to rotate.

5. A raw material preheating device for silicon carbide production according to claim 4, characterized in that: The sieve frame (210) covers the sieve cylinder (220), and a material drop hole (211) is provided at the bottom of the sieve frame (210). The lower tray (320) is located below the material drop hole (211) after sliding.

6. A raw material preheating device for silicon carbide production according to claim 4, characterized in that: The sieve drum (220) is arranged tilted, with the side of the sieve drum (220) close to the furnace body (1) being lower than the side away from the furnace body (1).

7. A raw material preheating device for silicon carbide production according to claim 1, characterized in that: The uniform distribution member (4) comprises: A second driving member (410) is arranged on the furnace body (1); a gear (420) rotatably disposed on the furnace body (1), wherein the second driving member (410) is used to drive the gear (420) to rotate; A chain (430) is arranged on the gear (420); A scraper (440) is arranged on the chain (430), and the scraper (440) moves along the track of the chain (430). When the scraper (440) moves above the track of the chain (430), the bottom of the scraper (440) abuts against the top of the upper tray (310).

8. A raw material preheating device for silicon carbide production according to claim 1, characterized in that: The uniform distribution member (4) further comprises: A vibrating member (450) is arranged on the lower tray (320), and the vibrating member (450) is used to spread the material that falls into the lower tray (320).

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