Granular silicon feeding barrel of single crystal furnace

Abstract

The utility model discloses a granular silicon charging barrel for a single crystal furnace, which belongs to the technical field of photovoltaic production, and aims at solving the problems that the crystal pulling quality is influenced by material jumping and non-scattering of caked granular silicon caused by poor concentration ratio of the conventional charging device, the granular silicon charging barrel comprises a barrel body, one side of the barrel body is fixedly connected with a chute, and the top of the chute is fixedly connected with a material guide box; according to the feeding device, the flange is arranged to be matched with the bottom bowl, the flange is used for clamping the bottom bowl, when feeding is needed, the handle is rotated to drive the threaded rod to rotate, the threaded rod drives the round rod to descend, and therefore the bottom bowl descends, and silicon particles fall from gaps to be fed; by designing an extension with guiding significance, when particle silicon enters the crucible, a silicon material is accumulated in the middle as far as possible, and the influence caused by hydrogen jump is avoided as far as possible, so that the crystal pulling stability is improved, meanwhile, the size of the bottom bowl is reduced compared with that of an existing device, and the purchasing cost of the quartz cone is reduced.

Description

Technical Field

[0001] The utility model belongs to the technical field of photovoltaic production, and in particular relates to a granular silicon feeding barrel for a single crystal furnace. Background Art

[0002] As a clean energy source, the photovoltaic field has achieved rapid and high-quality development. The core product of solar cell modules, single crystal silicon rods, has seen significant large-scale expansion in production in recent years. The main cost of increasing the production of silicon rods comes from single crystal silicon. The current technology for preparing single crystal silicon is mainly divided into two types: floating zone melting method and Czochralski method. The Czochralski method is relatively cheaper and has a faster growth rate, and is more suitable for pulling large-size single crystal silicon rods. The working principle of the Czochralski method is to heat and melt the raw materials that make up the crystal in a crucible, connect a seed crystal to the surface of the melt and pull the melt. Under controlled conditions, the seed crystal and the melt are continuously rearranged in atoms or molecules at the interface, and a single crystal grows as the temperature drops and gradually solidifies. The feeder is an indispensable tool for continuous crystal pulling.

[0003] In the prior art, there is a single crystal furnace feeder with patent announcement number CN201778144U. The above patent includes a quartz cylinder and a molybdenum center axis. The molybdenum center axis is located in the quartz cylinder, and the molybdenum center axis is movably fixed in the quartz cylinder through a radial support frame. A conical quartz hammer is connected to the tail of the molybdenum center axis, and the maximum cone diameter of the quartz hammer is larger than the cylinder diameter of the quartz cylinder. However, there are still the following deficiencies in actual use: from a practical point of view, the bottom bowl of the barrel is directly matched with the quartz barrel. When the bottom bowl of the granular material is opened for unloading, this configuration will cause poor material concentration, and material jumping will occur during material processing, which will pose a hidden danger to the subsequent crystal pulling process; at the same time, the granular silicon will become damp and agglomerated during storage. If it is not broken up when loading, it will affect the subsequent crystal pulling work, thereby affecting the tensile quality of the single crystal silicon.

[0004] Therefore, a single crystal furnace granular silicon feeding barrel is needed to solve the problem in the prior art that poor concentration of the feeder will cause material jumping and agglomerated granular silicon will not be broken up, affecting the quality of crystal pulling. Utility Model Content

[0005] The utility model aims to provide a single crystal furnace granular silicon feeding bucket to solve the problems raised in the above background technology.

[0006] To achieve the above-mentioned purpose, the utility model provides the following technical solutions: a single crystal furnace granular silicon feeding barrel, comprising a barrel body, a chute fixedly connected to one side of the barrel body, a material guide box fixedly connected to the top of the chute, a loading chute fixedly connected to the top of the material guide box, a chute cover rotatably connected to the top of the loading chute, a breaking mechanism is arranged inside the material guide box, a threaded rod rotatably connected to the top of the barrel body, a handle fixedly connected to the top of the threaded rod, a round rod fixedly connected to the bottom of the threaded rod, a bottom bowl fixedly connected to the bottom of the round rod, connecting plates fixedly connected to the inner walls on both sides of the barrel body, a limiting pipe sleeve corresponding to the round rod fixedly connected between the two connecting plates, and a flange corresponding to the bottom bowl fixedly connected to the inner wall of the barrel body near the bottom.

[0007] It should be noted in the solution that a hinge corresponding to the trough cover is installed on the top of the feeding trough.

[0008] It is further worth explaining that the breaking mechanism includes two first servo motors fixedly connected to the top position of the rear end of the material guide box and two second servo motors fixedly connected to the bottom position of the rear end of the material guide box, the output ends of the two first servo motors are fixedly connected to the first rotating shaft, the outer walls of the two first rotating shafts are fixedly connected to multiple groups of evenly distributed stirring blades, the center position of the inner wall of the material guide box is slidably connected to a filter frame, the output ends of the two second servo motors are fixedly connected to the second rotating shaft, and the outer walls of the two second rotating shafts are fixedly connected to two cams.

[0009] It should be further explained that the inner wall of the material guide box is provided with a limiting sliding groove corresponding to the filter frame.

[0010] As a preferred embodiment, a thread groove corresponding to the threaded rod is formed on the top of the barrel body.

[0011] As a preferred implementation, the round rod is sleeved on the inner wall of the limiting sleeve.

[0012] As a preferred embodiment, the inner diameter of the flange is smaller than the outer diameter of the bottom of the bottom bowl.

[0013] Compared with the prior art, the single crystal furnace granular silicon feeding barrel provided by the utility model has at least the following beneficial effects:

[0014] (1) By setting the flange and the bottom bowl to match, the flange is used to clamp the bottom bowl. When adding materials, the handle is turned to drive the threaded rod to rotate, so that the threaded rod drives the round rod to descend, so that the bottom bowl descends and the granular silicon falls from the gap to carry out the adding work. By designing an extension with guiding significance, it is ensured that when the granular silicon enters the crucible, the silicon material is piled in the middle as much as possible, and the influence of hydrogen jump is avoided as much as possible, thereby increasing the stability of crystal pulling. At the same time, the size of the bottom bowl is reduced compared with the existing device, reducing the procurement cost of quartz cones.

[0015] (2) By setting up a breaking mechanism, the slot cover is turned open to pour the granular silicon into the feeding slot, and the first servo motor is turned on to drive the stirring blade to stir and break up the added granular silicon. The stirred granular silicon falls into the top of the filter frame, and the second servo motor is turned on to drive the cam to rotate and intermittently strike the filter frame, so that the granular silicon can smoothly fall from the bottom of the filter frame and enter the barrel through the inclined slot, thereby preventing the granular silicon from agglomerating and affecting the subsequent crystal pulling work. At the same time, the filter frame can filter larger silicon material particles, ensuring that the silicon material particles can be melted in a relatively short time after being added. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 This is a schematic diagram of the structure of the utility model from a first perspective;

[0017] Figure 2 This is a schematic diagram of the structure of the utility model from a second viewing angle;

[0018] Figure 3 This is a schematic diagram of the internal structure of the barrel of the utility model;

[0019] Figure 4 It is a structural schematic diagram of the breaking mechanism of the utility model.

[0020] In the figure: 1. barrel body; 2. inclined chute; 3. material guide box; 4. feeding chute; 5. chute cover; 6. scattering mechanism; 601. first servo motor; 602. first rotating shaft; 603. stirring blade; 604. filter frame; 605. second servo motor; 606. second rotating shaft; 607. cam; 7. threaded rod; 8. handle; 9. round rod; 10. bottom bowl; 11. connecting plate; 12. limiting sleeve; 13. flange. DETAILED DESCRIPTION

[0021] The present invention will be further described below in conjunction with the embodiments.

[0022] See also Figure 1-4 The utility model provides a granular silicon feeding barrel for a single crystal furnace, comprising a barrel body 1, a chute 2 is fixedly connected to one side of the barrel body 1, a material guide box 3 is fixedly connected to the top of the chute 2, a loading chute 4 is fixedly connected to the top of the material guide box 3, a chute cover 5 is rotatably connected to the top of the loading chute 4, a scattering mechanism 6 is arranged inside the material guide box 3, a threaded rod 7 is rotatably connected to the top of the barrel body 1, a handle 8 is fixedly connected to the top of the threaded rod 7, a round rod 9 is fixedly connected to the bottom of the threaded rod 7, a bottom bowl 10 is fixedly connected to the bottom of the round rod 9, connecting plates 11 are fixedly connected to the inner walls on both sides of the barrel body 1, a limiting pipe sleeve 12 corresponding to the round rod 9 is fixedly connected between the two connecting plates 11, and a flange 13 corresponding to the bottom bowl 10 is fixedly connected to the inner wall of the barrel body 1 near the bottom.

[0023] Further Figure 1, Figure 2 and Figure 3 As shown, it is worth explaining in detail that a hinge corresponding to the trough cover 5 is installed on the top of the loading trough 4, and the loading trough 4 and the trough cover 5 are rotatably connected through the hinge, which is convenient for the staff to open and close the trough cover 5. At the same time, the trough cover 5 prevents the granular silicon from escaping from the loading trough 4 during the breaking work.

[0024] Further as Figure 4 As shown, it is worth specifically explaining that the breaking up mechanism 6 includes two first servo motors 601 fixedly connected to the top position of the rear end of the material guide box 3 and two second servo motors 605 fixedly connected to the bottom position of the rear end of the material guide box 3, the output ends of the two first servo motors 601 are fixedly connected to the first rotating shaft 602, the outer walls of the two first rotating shafts 602 are fixedly connected to multiple groups of evenly distributed stirring blades 603, a filter frame 604 is slidably connected to the center position of the inner wall of the material guide box 3, the output ends of the two second servo motors 605 are fixedly connected to the second rotating shaft 606, and the outer walls of the two second rotating shafts 606 are fixedly connected to two cams 607. By setting up the breaking up mechanism 6, the agglomeration of granular silicon can be avoided to affect the subsequent crystal pulling work. At the same time, the filter frame 604 can filter larger silicon material particles to ensure that the silicon material particles can be melted in a shorter time after being added.

[0025] Further as Figure 4 As shown, it is worth explaining in detail that a limiting groove corresponding to the filter frame 604 is opened on the inner wall of the material guide box 3 to ensure that the filter frame 604 can slide up and down flexibly on the inner wall of the material guide box 3, thereby cooperating with the cam 607, so that the second servo motor 605 drives the cam 607 to rotate and intermittently strike the filter frame 604.

[0026] According to the above working process, it can be known that: by setting up the breaking mechanism 6, the slot cover 5 is rotated to open and the granular silicon is poured into the feeding slot 4, the first servo motor 601 is turned on to drive the stirring blade 603 to stir and break up the added granular silicon, and the stirred granular silicon falls into the top of the filter frame 604, and the second servo motor 605 is turned on to drive the cam 607 to rotate and intermittently hit the filter frame 604, so that the granular silicon can smoothly fall from the bottom of the filter frame 604, and then enter the barrel body 1 through the inclined slot 2, so as to avoid the granular silicon agglomeration affecting the subsequent crystal pulling work, and at the same time, the filter frame 604 can filter larger silicon material particles to ensure that the silicon material particles can be melted in a shorter time after being added.

[0027] Further as Figure 1 , Figure 2 and Figure 3 As shown, it is worth explaining in detail that a threaded groove corresponding to the threaded rod 7 is opened on the top of the barrel body 1, and the threaded groove cooperates with the threaded rod 7 so that the threaded rod 7 can be raised and lowered while rotating, thereby flexibly raising and lowering the bottom bowl 10.

[0028] Further as Figure 3 As shown, it is worth explaining in detail that the round rod 9 is sleeved on the inner wall of the limiting sleeve 12, and the limiting sleeve 12 limits and guides the movement of the round rod 9, so that the vertical movement of the round rod 9 is more stable, thereby ensuring that the lifting and lowering of the bottom bowl 10 is more stable.

[0029] Further as Figure 3 As shown, it is worth explaining in detail that the inner diameter of the flange 13 is smaller than the outer diameter of the bottom of the bottom bowl 10, so as to ensure that the flange 13 can clamp the bottom bowl 10 when no material is added to prevent the existence of gaps.

[0030] This solution has the following working process: in actual use, the slot cover 5 is turned open to pour the granular silicon into the loading slot 4, the first servo motor 601 is turned on to drive the stirring blade 603 to stir and break up the added granular silicon, and the stirred granular silicon falls into the top of the filter frame 604, the second servo motor 605 is turned on to drive the cam 607 to rotate to intermittently hit the filter frame 604, so that the granular silicon can smoothly fall from the bottom of the filter frame 604, and then enter the barrel body 1 through the inclined slot 2. When feeding is needed, the handle 8 is turned to drive the threaded rod 7 to rotate, so that the threaded rod 7 drives the round rod 9 to descend, thereby causing the bottom bowl 10 to descend, and the granular silicon falls from the gap to perform feeding.

[0031] In summary: by setting up the breaking mechanism 6, the granular silicon is prevented from agglomerating and affecting the subsequent crystal pulling work. At the same time, the filter frame 604 can filter larger silicon material particles to ensure that the silicon material particles can be melted in a shorter time after being added; by setting the flange 13 and the bottom bowl 10 to cooperate, the flange 13 is used to clamp the bottom bowl 10. When adding material is needed, the threaded rod 7 rotates to drive the bottom bowl 10 to descend, and the granular silicon falls from the gap to carry out the adding work. By designing an extension with guiding significance, it is ensured that when the granular silicon enters the crucible, the silicon material is piled in the middle as much as possible to avoid the influence of hydrogen jump as much as possible, thereby increasing the stability of crystal pulling. At the same time, the size of the bottom bowl 10 is reduced compared with the existing device, thereby reducing the procurement cost of quartz cones.

Claims

1. A single crystal furnace granular silicon feeding barrel, comprising a barrel body (1), characterized in that: A chute (2) is fixedly connected to one side of the barrel body (1), a material guide box (3) is fixedly connected to the top of the chute (2), a material loading chute (4) is fixedly connected to the top of the material guide box (3), a chute cover (5) is rotatably connected to the top of the material loading chute (4), a scattering mechanism (6) is arranged inside the material guide box (3), a threaded rod (7) is rotatably connected to the top of the barrel body (1), a handle (8) is fixedly connected to the top of the threaded rod (7), a round rod (9) is fixedly connected to the bottom of the threaded rod (7), a bottom bowl (10) is fixedly connected to the bottom of the round rod (9), connecting plates (11) are fixedly connected to the inner walls of both sides of the barrel body (1), a limiting pipe sleeve (12) corresponding to the round rod (9) is fixedly connected between the two connecting plates (11), and a flange (13) corresponding to the bottom bowl (10) is fixedly connected to the inner wall of the barrel body (1) near the bottom.

2. A single crystal furnace granular silicon feeding barrel according to claim 1, characterized in that: A hinge corresponding to the trough cover (5) is installed on the top of the feeding trough (4).

3. The single crystal furnace granular silicon feeding barrel according to claim 1, characterized in that: The dispersing mechanism (6) comprises two first servo motors (601) fixedly connected to the top position of the rear end of the material guide box (3) and two second servo motors (605) fixedly connected to the bottom position of the rear end of the material guide box (3); the output ends of the two first servo motors (601) are fixedly connected to a first rotating shaft (602); the outer walls of the two first rotating shafts (602) are fixedly connected to a plurality of groups of evenly distributed stirring blades (603); the center position of the inner wall of the material guide box (3) is slidably connected to a filter frame (604); the output ends of the two second servo motors (605) are fixedly connected to a second rotating shaft (606); the outer walls of the two second rotating shafts (606) are fixedly connected to two cams (607).

4. The single crystal furnace granular silicon feeding barrel according to claim 3, characterized in that: The inner wall of the material guide box (3) is provided with a limiting sliding groove corresponding to the filter frame (604).

5. The single crystal furnace granular silicon feeding barrel according to claim 1, characterized in that: The top of the barrel body (1) is provided with a threaded groove corresponding to the threaded rod (7).

6. The single crystal furnace granular silicon feeding barrel according to claim 1, characterized in that: The round rod (9) is sleeved on the inner wall of the limiting pipe sleeve (12).

7. The single crystal furnace granular silicon feeding barrel according to claim 1, characterized in that: The inner diameter of the flange (13) is smaller than the outer diameter of the bottom of the bottom bowl (10).

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