A preparation furnace charge mixing device for polysilicon production

Abstract

The utility model provides a kind of preparation furnace charge mixing device for polysilicon preparation, driving motor starts driving driving rod rotation, driving rod rotation drives first helical gear rotation, first helical gear rotation drives second helical gear rotation, and further drives second transmission rod rotation, second transmission rod rotation drives first transmission rod rotation, and further drives intermittent blanking mechanism rotation, to realize the intermittent conveying of material into mixing tank, intermittent blanking makes that material can be more fully stirred evenly, facilitate subsequent replacement reaction of more sufficient of silicon dioxide and carbon of coke under high temperature;Driving motor starts driving first support rod, scraper and second support rod rotation, scraper and mixing tank inner wall rotation connection realizes the effect of cleaning mixing tank inner wall, avoid mixing tank inner wall residue adhesion to form hard agglomerate;Driving motor starts stirring vane rotation along with rotating rod, realizes the mixing and stirring of quartz sand and coke.

Description

Technical Field

[0001] This utility model belongs to the field of mixing equipment technology, and in particular relates to a mixing device for a preparation furnace charge for polycrystalline silicon preparation. Background Technology

[0002] The first step in the preparation of polycrystalline silicon is to prepare crude silicon. Specifically, quartz sand, as the main material, is thoroughly mixed with a carbonaceous reducing agent (coke). Under high temperature conditions, the quartz sand (mainly composed of SiO2) reacts with the coke to produce silicon and carbon monoxide. The reaction equation is: 2C + SiO2 = Si + 2CO↑. During the reaction, the silicon dioxide in the quartz sand and the carbon in the coke undergo a displacement reaction at high temperature to produce elemental silicon.

[0003] Existing mixing equipment involves directly pouring crushed quartz sand and coke into a mixing tank, followed by stirring with agitator blades. This one-time mixing method easily leads to insufficient mixing in certain areas, resulting in incomplete displacement reactions and affecting the efficiency of the subsequent high-temperature displacement reaction between silica and coke. Furthermore, during stirring, the mixture tends to adhere to the inner wall of the mixing tank. If the inner wall is not thoroughly cleaned or residual material accumulates in the tank for a long time, it may form hard lumps that damage the mixing tank. Therefore, this invention proposes a mixing device for polycrystalline silicon preparation furnace charge to solve the above problems. Utility Model Content

[0004] This invention provides a mixing device for a preparation furnace charge in polycrystalline silicon preparation, which aims to solve the problems mentioned in the background art.

[0005] This utility model is implemented as follows: a mixing device for a polycrystalline silicon preparation furnace includes a mixing tank, a feeding tank, a driving assembly, a stirring assembly, and a scraper assembly. Two opposing limiting blocks are fixedly provided on the inner wall near the bottom of the feeding tank. The opposing surfaces of the two limiting blocks are arc-shaped. A feeding trough is provided between the two limiting blocks. An intermittent feeding mechanism is provided inside the feeding trough. The intermittent feeding mechanism includes a first transmission rod. Four circularly distributed partition plates are fixedly provided on the outer wall of the first transmission rod. The four partition plates divide the feeding trough into four feeding chambers. An arc-shaped baffle is provided between two adjacent partition plates. Two arc-shaped baffles are provided. The two arc-shaped baffles seal the two opposing feeding chambers. The drive assembly includes a drive motor, and the output end of the drive motor is connected to a drive rod. The stirring assembly includes stirring blades, and multiple stirring blades are provided, with the multiple stirring blades being spaced apart along the extension direction of the drive rod; The scraper assembly includes a first support rod, a scraper, and a second support rod. The first and second support rods are fixedly connected to the drive rod, and the scraper is disposed between the first and second support rods and rotatably connected to the inner wall of the mixing tank.

[0006] Preferably, the feeding tank includes a first feeding tank and a second feeding tank, which are symmetrically distributed on the top surface of the mixing tank. The first feeding tank and the second feeding tank are each provided with a feeding port at the top and a discharging port at the bottom. The discharging port is connected to the internal space of the mixing tank.

[0007] Preferably, the drive motor is fixedly mounted on the top of the mixing tank, a first helical gear is fixedly mounted on the drive rod, the first helical gear is located above the first support rod, a second helical gear is provided above the first helical gear and meshes with it, the second helical gear is fixedly connected to one end of the second transmission rod, and the other end of the second transmission rod is fixedly connected to the first transmission rod.

[0008] Preferably, the first helical gear and the second helical gear are provided with a fixed box on their exterior.

[0009] Preferably, the stirring assembly further includes a mounting sleeve, which is fixedly connected to the drive rod, and the stirring blade is fixedly connected to the mounting sleeve by bolts.

[0010] Preferably, a hopper is provided at the middle position of the bottom surface of the mixing tank, and the hopper is connected to the internal space of the mixing tank.

[0011] Preferably, the bottom surface of the mixing tank is provided with four legs arranged in a matrix.

[0012] Compared with the prior art, the beneficial effects of this utility model are: 1. The drive motor starts and drives the drive rod to rotate. The drive rod rotates and drives the first helical gear to rotate. The first helical gear rotates and drives the second helical gear to rotate, which in turn drives the second transmission rod to rotate. The second transmission rod rotates and drives the first transmission rod to rotate, which in turn drives the intermittent feeding mechanism to rotate, thereby realizing the intermittent feeding of materials into the mixing tank. The intermittent feeding allows the materials to be mixed more thoroughly and evenly, which facilitates a more complete replacement reaction between silica and carbon in coke at high temperature. 2. When the drive motor starts, it drives the first support rod, scraper and second support rod to rotate. At this time, the scraper is rotatably connected to the inner wall of the mixing tank, so as to clean the inner wall of the mixing tank and prevent the residue from adhering to the inner wall of the mixing tank and forming hard lumps. 3. The drive motor starts the stirring blades, which rotate with the rotating rod to achieve the mixing of quartz sand and coke. The drive motor, as a single driving source, can simultaneously achieve the functions of slow feeding, stirring, and cleaning the inner wall of the mixing tank. Attached Figure Description

[0013] Figure 1 This is a front view of the overall structure of this utility model; Figure 2 This is a schematic diagram of the drive component structure in this utility model; Figure 3 This is a schematic diagram of the feed tank structure in this utility model; Figure 4 This is a schematic diagram of the feed tank and intermittent feeding mechanism in the non-feeding state of this utility model; Figure 5 This is a schematic diagram of the feeding tank and intermittent feeding mechanism in the feeding state of this utility model; Figure 6 This is a schematic diagram of the stirring assembly and scraper assembly in this utility model.

[0014] In the picture: 1. Mixing tank; 11. Hopper; 12. Support legs; 2. First feed tank; 21. Limiting block; 22. Discharge chute; 23. Intermittent discharge mechanism; 24. First transmission rod; 25. Divider plate; 26. Discharge chamber; 27. Arc-shaped baffle; 3. Second feed tank; 4. Drive assembly; 41. Drive motor; 42. Drive rod; 43. First helical gear; 44. Second helical gear; 45. Second transmission rod; 46. Fixing box; 5. Mixing assembly; 51. Mounting sleeve; 52. Mixing blades; 6. Scraper assembly; 61. First support rod; 62. Scraper; 63. Second support rod. Detailed Implementation

[0015] The technical solution of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are some embodiments of this utility model, but not all embodiments.

[0016] The components of the present invention embodiments described and shown in the accompanying drawings can typically be arranged and designed in a variety of different configurations. Therefore, the following detailed description of the embodiments of the present invention provided in the drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention.

[0017] Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this utility model.

[0018] In the description of this utility model, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the accompanying drawings and are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0019] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0020] Please see Figures 1 to 6 This utility model provides a technical solution: a mixing device for polycrystalline silicon preparation furnace charge, including a mixing tank 1, a feeding tank, a driving assembly 4, a stirring assembly 5, and a scraper assembly 6; two opposing limiting blocks 21 are fixedly provided on the inner wall near the bottom of the feeding tank, the opposing surfaces of the two limiting blocks 21 are arc-shaped, a feeding trough 22 is provided between the two limiting blocks 21, and an intermittent feeding mechanism 23 is provided inside the feeding trough 22. The intermittent feeding mechanism 23 includes a first transmission rod 24, and four ring-shaped partition plates 25 are fixedly provided on the outer wall of the first transmission rod 24. The four partition plates 25 divide the feeding trough 22 into four feeding chambers 26, of which two An arc-shaped baffle 27 is provided between two adjacent partition plates 25, and the two arc-shaped baffles 27 seal the two oppositely distributed feeding chambers 26; the drive assembly 4 includes a drive motor 41, and the output end of the drive motor 41 is connected to a drive rod 42; the stirring assembly 5 includes stirring blades 52, and multiple stirring blades 52 are provided, and the multiple stirring blades 52 are spaced apart along the extension direction of the drive rod 42; the scraper assembly 6 includes a first support rod 61, a scraper 62 and a second support rod 63, the first support rod 61 and the second support rod 63 are fixedly connected to the drive rod 42, and the scraper 62 is located between the first support rod 61 and the second support rod 63 and is rotatably connected to the inner wall of the mixing tank 1.

[0021] In this embodiment, the feeding tank includes a first feeding tank 2 and a second feeding tank 3. The first feeding tank 2 and the second feeding tank 3 are symmetrically distributed on the top of the mixing tank 1. The first feeding tank 2 and the second feeding tank 3 have the same structure. The first feeding tank 2 is used to hold crushed quartz sand, and the second feeding tank 3 is used to hold coke. The intermittent feeding mechanism 23 is used for intermittent feeding of materials (quartz sand and coke), which allows the materials to be more thoroughly mixed and evenly, facilitating a more complete replacement reaction between silica and carbon in coke at high temperature. See Figure 1 The feeding tank includes a first feeding tank 2 and a second feeding tank 3. The top of the first feeding tank 2 and the second feeding tank 3 are provided with a feeding port, and the bottom of the first feeding tank 2 and the second feeding tank 3 are provided with a discharge port. The discharge port is connected to the internal space of the mixing tank 1. See Figure 4 and Figure 5 The intermittent feeding mechanism 23 has two sets. One set drives the first feed tank 2 to feed material, and the other set drives the second feed tank 3 to feed material. The intermittent feeding mechanism 23 includes a first transmission rod 24 and four partition plates 25 arranged in a ring. The four partition plates 25 divide the feeding trough 22 into four feeding chambers 26. The included angle between two adjacent partition plates 25 is 90°. Two of the oppositely distributed feeding chambers 26 are sealed by arc-shaped baffles 27, while the other two oppositely distributed feeding chambers 26 are in an open state. The sealed feeding chambers 26 do not convey material, and the open feeding chambers do not convey material. The intermittent feeding mechanism 23 rotates, with the sealed feeding chamber 26 and the open feeding chamber 26 alternately connected to the feed tank. When the sealed feeding chamber 26 is connected to the feed tank, the material does not fall. When the open feeding chamber 26 is connected to the feed tank, the material falls into the internal space of the open feeding chamber 26. As the intermittent feeding mechanism 23 rotates, the material is transported to the discharge port and then falls into the mixing tank 1. After all the material has fallen into the mixing tank 1, the drive motor 41 still needs to drive the stirring assembly 5 to work for a period of time before stopping. The working principle of the intermittent feeding mechanism 23 is as follows: the drive motor 41 starts and drives the drive rod 42 to rotate, the drive rod 42 rotates and drives the first helical gear 43 to rotate, the first helical gear 43 rotates and drives the second helical gear 44 to rotate, which in turn drives the second transmission rod 45 to rotate, the second transmission rod 45 rotates and drives the first transmission rod 24 to rotate, which in turn drives the intermittent feeding mechanism 23 to rotate, thereby realizing the intermittent delivery of materials to the mixing tank 1; See Figure 1 and Figure 6While the intermittent feeding mechanism 23 is working, the drive motor 41 starts and drives the first support rod 61, scraper 62 and second support rod 63 to rotate. At this time, the scraper 62 is rotatably connected to the inner wall of the mixing tank 1, realizing the function of cleaning the inner wall of the mixing tank 1 and preventing the residue from adhering to the inner wall of the mixing tank 1 and forming hard lumps. In another embodiment, the scraper 62 can be replaced with a brush, and the brush surface of the brush is rotatably connected to the inner wall of the mixing tank 1. At the same time, the stirring blade 52 rotates with the drive rod 42 to realize the mixing and stirring of quartz sand and coke. In this embodiment, the drive motor 41, a single drive source, can simultaneously realize the functions of slow feeding, stirring and cleaning the inner wall of the mixing tank 1. In operation, the first feed tank 2 contains crushed quartz sand, and the second feed tank 3 contains coke. Then, the drive motor 41 is started, which drives the drive rod 42 to rotate. The drive rod 42 rotates, which in turn drives the first helical gear 43 to rotate, which in turn drives the second helical gear 44 to rotate, which in turn drives the second transmission rod 45 to rotate. The second transmission rod 45 rotates, which in turn drives the first transmission rod 24 to rotate, which in turn drives the intermittent feeding mechanism 23 to rotate, thereby realizing the intermittent delivery of materials to the mixing tank 1. At the same time, the drive motor 41 starts, which drives the first support rod 61, scraper 62 and second support rod 63 to rotate. At this time, the scraper 62 is rotatably connected to the inner wall of the mixing tank 1, realizing the function of cleaning the inner wall of the mixing tank 1. Meanwhile, the stirring blade 52 rotates with the drive rod 42 to achieve the mixing and stirring of quartz sand and coke.

[0022] For further details, please refer to Figure 1 The feeding tank includes a first feeding tank 2 and a second feeding tank 3. The first feeding tank 2 and the second feeding tank 3 are symmetrically distributed on the top surface of the mixing tank 1. The top of the first feeding tank 2 and the second feeding tank 3 are provided with a feeding port, and the bottom of the first feeding tank 2 and the second feeding tank 3 are provided with a discharge port. The discharge port is connected to the internal space of the mixing tank 1.

[0023] In this embodiment, the top inlet is used to add materials, and the bottom outlet is used to discharge materials, so that the materials in the feed tank are added into the internal space of the mixing tank 1.

[0024] For further details, please refer to Figure 1 and Figure 2 The drive motor 41 is fixedly mounted on the top of the mixing tank 1. A first helical gear 43 is fixedly mounted on the drive rod 42. The first helical gear 43 is located above the first support rod 61. A second helical gear 44 is provided above the first helical gear 43 and meshes with it. The second helical gear 44 is fixedly connected to one end of the second transmission rod 45, and the other end of the second transmission rod 45 is fixedly connected to the first transmission rod 24.

[0025] In this embodiment, the drive motor 41 can simultaneously drive two sets of intermittent feeding mechanisms 23 to work. Specifically, the drive motor 41 starts and drives the drive rod 42 to rotate. The drive rod 42 rotates and drives the first helical gear 43 to rotate. The first helical gear 43 rotates and drives the second helical gears 44 on the upper left and right sides to rotate. The second helical gears 44 rotate and drive the second transmission rod 45 to rotate. The second transmission rod 45 rotates and drives the first transmission rod 24 to rotate, thereby driving the intermittent feeding mechanism 23 to rotate, so as to realize the intermittent delivery of materials to the mixing tank 1.

[0026] For further details, please refer to Figure 1 and Figure 2 The first helical gear 43 and the second helical gear 44 are provided with a fixed box 46 on the outside.

[0027] In this embodiment, a connecting rod is provided between the second transmission rod 45 and the top surface of the inner wall of the mixing tank 1. One end of the connecting rod is fixedly connected to the top surface of the inner wall of the mixing tank 1, and the other end is rotatably connected to the second transmission rod 45. The fixed box 46 is provided to prevent the first helical gear 43 and the second helical gear 44 from disengaging. The second transmission rod 45 is rotatably connected to the fixed box 46, and the drive rod 42 is rotatably connected to the fixed box 46.

[0028] For further details, please refer to Figure 6 The stirring assembly 5 also includes a mounting sleeve 51, which is fixedly connected to the drive rod 42, and the stirring blade 52 is fixedly connected to the mounting sleeve 51 by bolts.

[0029] In this embodiment, the mounting sleeve 51 is fixedly connected to the drive rod 42, and the stirring blade 52 is fixedly connected to the mounting sleeve 51 by bolts. The mounting sleeve 51 and the stirring blade 52 can be disassembled and assembled by bolts, which facilitates the cleaning and maintenance of the stirring blade 52.

[0030] For further details, please refer to Figure 1 A hopper 11 is provided at the middle of the bottom surface of the mixing tank 1, and the hopper 11 is connected to the internal space of the mixing tank 1.

[0031] For further details, please refer to Figure 1 The bottom surface of the mixing tank 1 is provided with four support legs 12 arranged in a matrix.

[0032] In this embodiment, after stirring is completed, the mixture is collected through the hopper 11; the four support legs 12 arranged in a matrix provide support and stability for the entire device.

[0033] The working principle and usage process of this utility model are as follows: In use, the first feed tank 2 is filled with crushed quartz sand, and the second feed tank 3 is filled with coke. Then, the drive motor 41 is started, which drives the drive rod 42 to rotate. The drive rod 42 rotates, which drives the first helical gear 43 to rotate. The first helical gear 43 rotates, which drives the second helical gear 44 to rotate, which in turn drives the second transmission rod 45 to rotate. The second transmission rod 45 rotates, which drives the first transmission rod 24 to rotate, which in turn drives the intermittent feeding mechanism 23 to rotate, thereby realizing the intermittent delivery of materials to the mixing tank 1. At the same time, the drive motor 41 starts, which drives the first support rod 61, scraper 62 and second support rod 63 to rotate. At this time, the scraper 62 is rotatably connected to the inner wall of the mixing tank 1, realizing the function of cleaning the inner wall of the mixing tank 1. At the same time, the stirring blade 52 rotates with the drive rod 42 to realize the mixing and stirring of quartz sand and coke.

[0034] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A mixing apparatus for a preparation furnace charge in polycrystalline silicon preparation, characterized in that: It includes a mixing tank (1), a feeding tank, a drive assembly (4), a stirring assembly (5), and a scraper assembly (6); Two opposing limiting blocks (21) are fixedly provided on the inner wall near the bottom of the feed tank. The opposing surfaces of the two limiting blocks (21) are arc-shaped. A feeding trough (22) is provided between the two limiting blocks (21). An intermittent feeding mechanism (23) is provided inside the feeding trough (22). The intermittent feeding mechanism (23) includes a first transmission rod (24). Four ring-shaped partition plates (25) are fixedly provided on the outer wall of the first transmission rod (24). The four partition plates (25) divide the feeding trough (22) into four feeding chambers (26). An arc-shaped baffle (27) is provided between two adjacent partition plates (25). There are two arc-shaped baffles (27). The two arc-shaped baffles (27) seal the two opposing feeding chambers (26). The drive assembly (4) includes a drive motor (41), the output end of which is connected to a drive rod (42). The stirring assembly (5) includes stirring blades (52), and multiple stirring blades (52) are provided, with the multiple stirring blades (52) being spaced apart along the extension direction of the drive rod (42); The scraper assembly (6) includes a first support rod (61), a scraper (62), and a second support rod (63). The first support rod (61) and the second support rod (63) are fixedly connected to the drive rod (42). The scraper (62) is disposed between the first support rod (61) and the second support rod (63) and is rotatably connected to the inner wall of the mixing tank (1).

2. The polycrystalline silicon preparation furnace charge mixing device according to claim 1, characterized in that: The feeding tank includes a first feeding tank (2) and a second feeding tank (3). The first feeding tank (2) and the second feeding tank (3) are symmetrically distributed on the top surface of the mixing tank (1). The top of the first feeding tank (2) and the second feeding tank (3) are provided with feeding ports, and the bottom of the first feeding tank (2) and the second feeding tank (3) are provided with discharging ports. The discharging ports are connected to the internal space of the mixing tank (1).

3. The polycrystalline silicon preparation furnace charge mixing device according to claim 1, characterized in that: The drive motor (41) is fixedly mounted on the top of the mixing tank (1). A first helical gear (43) is fixedly mounted on the drive rod (42). The first helical gear (43) is located above the first support rod (61). A second helical gear (44) is provided above the first helical gear (43) and meshes with it. The second helical gear (44) is fixedly connected to one end of the second transmission rod (45), and the other end of the second transmission rod (45) is fixedly connected to the first transmission rod (24).

4. The polycrystalline silicon preparation furnace charge mixing device according to claim 3, characterized in that: The first helical gear (43) and the second helical gear (44) are provided with a fixed box (46) on the outside.

5. The polycrystalline silicon preparation furnace charge mixing device according to claim 1, characterized in that: The stirring assembly (5) also includes a mounting sleeve (51), which is fixedly connected to the drive rod (42), and the stirring blade (52) is fixedly connected to the mounting sleeve (51) by bolts.

6. The polycrystalline silicon preparation furnace charge mixing apparatus according to claim 1, characterized in that: The mixing tank (1) has a feeding hopper (11) located in the middle of its bottom surface, and the feeding hopper (11) is connected to the internal space of the mixing tank (1).

7. The polycrystalline silicon preparation furnace charge mixing device according to claim 1, characterized in that: The bottom surface of the mixing tank (1) is provided with four support legs (12) arranged in a matrix.

Images