Feeding device for adding silicon material and feeding method thereof

Abstract

The invention discloses a feeding device for adding a silicon material and a feeding method thereof. The feeding device comprises a clamping mechanism, the clamping mechanism is connected to the combined charging barrel in a sleeving mode, the discharging mechanism comprises a lifting rod, the lower end of the lifting rod extends into the combined charging barrel, the base cone is arranged at the lower end of the lifting rod, the combined charging barrel comprises a plurality of split charging barrels, and the split charging barrels are sequentially connected; the charging method comprises the following steps: assembling a corresponding number of split charging barrels according to the amount of added silicon materials to form a combined charging barrel; a lifting rod penetrates into the combined charging barrel; the clamping mechanism is clamped on the combined charging barrel; charging the combined charging barrel; the combined charging barrel is moved downwards to a proper height, so that the clamping mechanism is clamped at the upper part of the furnace body isolation valve, and the combined charging barrel extends into the single crystal furnace main chamber; the lifting rod is moved downwards, so that the base cone moves downwards relative to the combined charging barrel; and the silicon material in the combined charging barrel slides down from the two sides of the base cone so as to realize charging. The invention is applied to the technical field of single crystal furnaces.

Description

Technical Field

[0001] The present invention relates to the technical field of single crystal furnaces, and in particular to a feeding device for adding silicon material and a feeding method thereof. Background Art

[0002] In the single crystal manufacturing industry, the feeding cylinder is a key equipment to ensure smooth production. It is mainly responsible for accurately adding silicon materials to the single crystal furnace. Its performance directly affects the production efficiency and quality of single crystal silicon. The existing feeding cylinders are divided into built-in feeding cylinders and external feeding cylinders, as follows: The built-in feeding tube makes little change to the furnace body and has low implementation cost, so it is widely used in the industry. Among them, the built-in hoisting feeder has a simple structure and is made of materials that will not contaminate the silicon material. It is fixed in the single crystal furnace by nuts. When adding silicon material for the second time, the edge material cut off after the single crystal silicon rod is squared is often used. The edge material is punched and hoisted on the core shaft. Multiple strips can be hoisted at one time, but this method has obvious disadvantages. When adding silicon material, the silicon material is immersed in the molten silicon liquid in the furnace, melts a section, and falls a section, resulting in a slow feeding speed, a long time and high energy consumption. Moreover, if the silicon material has cracks, there is a risk of the silicon material falling, and the feeding speed needs to be strictly controlled. Control is required, otherwise it is easy to cause silicon leakage risk; secondly, the main body of the built-in cylindrical feeder is mostly made of quartz barrel, which is moderately expensive; when feeding, the block silicon material is added to the quartz barrel, which is hung in the auxiliary chamber, and the barrel is lowered to allow the silicon material to fall into the quartz crucible. Although this method significantly shortens the time it takes for the silicon material to enter the crucible and melt compared to the above-mentioned hoisting feeding method, and has a simple structure and a large feeding capacity, with a maximum feeding capacity of 120kg at a time, the bottom of the feeder is fragile and easy to break, thereby contaminating the silicon material and even affecting the shutdown of the furnace, causing unsafe conditions. Moreover, if a part of the feeder is broken, the entire feeder needs to be replaced, which is costly and inconvenient to replace; An external feeding tube is usually a device designed independently of the single crystal furnace and connected to the single crystal furnace through a retractable feeding tube. Its advantage is that it can feed materials while melting the materials, and the feeding process can be controlled more accurately. Even by modifying the thermal field and quartz crucible, it can be added while pulling the crystal, which can effectively save the time of melting the materials and significantly reduce the cost of pulling the crystal. However, the external feeding tube also has many shortcomings. Its structure is complex, the manufacturing cost is high, and the one-time investment in equipment configuration is large. It also has high requirements for the particle size and consistency of the feeding materials, which increases the cost of silicon materials. In addition, there is a common problem of high failure rate, which is prone to material jamming, feed tube damage, and material splashing. These problems not only affect production efficiency, but may also lead to unstable product quality. Obviously, although the external type can achieve simultaneous feeding of materials while melting the materials and accurately control the feeding process, its structure is complex and the failure rate is high, resulting in high costs. Summary of the Invention

[0003] The technical problem to be solved by the present invention is to overcome the deficiencies of the prior art. The first purpose is to provide a feeding device for adding silicon material which has a simple structure, is easy to replace, reduces costs and has high feeding efficiency. The second object of the present invention is to provide a feeding method for a feeding device for adding silicon material, which is easy to replace, reduces costs and has high feeding efficiency.

[0004] The technical solution adopted by the present invention is: the feeding device for adding silicon material includes a clamping mechanism, a combined barrel and a discharge mechanism, the clamping mechanism is sleeved on the combined barrel, the discharge mechanism includes a lifting rod and a bottom cone, the lower end of the lifting rod extends into the combined barrel, the bottom cone is arranged at the lower end of the lifting rod and is located at the lower end of the combined barrel, the upper end of the combined barrel is provided with a cover plate, the combined barrel includes a plurality of split barrels, and the plurality of split barrels are connected in sequence.

[0005] Furthermore, the upper and lower ends of the split barrel are both provided with magnetic parts, and the split barrel is connected to the adjacent split barrel through the magnetic parts. The magnetic parts include a magnetic layer and an isolation layer. The magnetic layer is provided on the split barrel, and the isolation layer covers the outside of the magnetic layer.

[0006] Furthermore, a plurality of connecting holes are opened in the split barrel, and the upper and lower ends of the connecting holes respectively pass through the upper and lower ends of the split barrel. The feeding device also includes a plurality of rope bodies, and the rope bodies are connected between the plurality of split barrels through the connecting holes.

[0007] Furthermore, the upper end of the rope body is fixedly connected to the cover plate, the lower end of the rope body extends from top to bottom from the connecting hole at the bottom and is provided with a ball head, the upper end of the bottom cone is provided with a ball head groove, and the ball head is fitted in the ball head groove.

[0008] Furthermore, a connecting thread and a limit block are provided at the lower end of the lifting rod, the bottom cone is connected to the connecting thread, and the limit block is located at the upper end of the connecting thread and abuts against the upper end of the bottom cone.

[0009] Furthermore, the clamping mechanism includes a clamping seat, which is sleeved on the combined barrel. A plurality of clamping units are provided on the clamping seat, and the clamping ends of the plurality of clamping units are all clamped on the combined barrel.

[0010] Furthermore, the clamping unit includes a screw, and the clamping seat is provided with an internal groove, an external groove and a locking hole, the internal groove and the external groove are respectively located on the inner and outer sides of the clamping seat, the locking hole is connected between the internal groove and the external groove, the screw is connected in the locking hole, one end of the screw is connected to a nut, the width of the nut is greater than the width of the external groove, the clamping end of the clamping unit is a curved top plate connected to the other end of the screw, the width of the curved top plate is greater than the width of the internal groove, and a high-temperature buffer and wear-resistant pad is provided on the inner side of the curved top plate.

[0011] Furthermore, the angle between the bottom cone and the horizontal plane ranges from 10 degrees to 20 degrees.

[0012] Furthermore, the bottom cone is made of silicon carbide.

[0013] In addition, the present invention also provides a feeding method for a feeding device for adding silicon material, which comprises the following steps: Step S1: assembling a corresponding number of split barrels according to the amount of silicon material added to form a combined barrel, and inserting the rope into the connecting hole of the split barrel; Step S2: insert the lifting rod into the combined barrel, and connect the bottom cone to the lower end of the lifting rod and locate it at the lower end of the combined barrel; Step S3: clamping the clamping mechanism on the combined barrel according to the height between the furnace isolation valve and the feeding liquid level; Step S4: loading the combined barrel, closing the cover plate on the upper end of the combined barrel, and fixing the rope body to the cover plate; Step S5: Grab the lifting rod, align the lower part of the bottom cone with the furnace isolation valve, and open the furnace isolation valve; Step S6: Move the combined barrel downward to a suitable height so that the clamping mechanism is clamped on the upper part of the furnace isolation valve and the combined barrel extends into the interior of the single crystal furnace main chamber; Step S7: Move the lifting rod downward to move the bottom cone downward relative to the combined barrel; Step S8: The silicon material in the combined barrel slides down from both sides of the bottom cone to achieve material addition.

[0014] The beneficial effects of the present invention are: In contrast to the deficiencies of the prior art, in the present invention, a plurality of split barrels are connected in sequence to form a combined barrel. When a combined barrel is broken at a certain place, only the broken split barrel can be replaced, so as to facilitate replacement and reduce costs. Moreover, when assembling the combined barrel, the number of assembled split barrels can be controlled according to the amount of silicon material added to determine the height of the combined barrel, so as to facilitate independent selection between fewer and more additions and reduce waste. In addition, by moving the bottom cone downward relative to the combined barrel, the silicon material can slide down from both sides of the bottom cone to achieve addition. This feeding method can add enough silicon material at one time, so that the feeding device for adding silicon material has the advantages of simple structure, easy replacement, reduced cost and high feeding efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the structures shown in these drawings without paying any creative work.

[0016] Figure 1 It is a schematic diagram of the three-dimensional structure of the present invention; Figure 2 It is a schematic cross-sectional view of the present invention; Figure 3 yes Figure 2 A partial enlarged schematic diagram of part A; Figure 4 It is a schematic diagram of the three-dimensional structure of the split barrel of the present invention; Figure 5 It is a schematic diagram of the three-dimensional structure of the bottom cone of the present invention; Figure 6 It is a schematic cross-sectional view of the clamping seat of the present invention.

[0017] The reference numerals are as follows: 1. Clamping mechanism; 2. Combined barrel; 3. Discharging mechanism; 5. Lifting rod; 6. Bottom cone; 7. Cover plate; 8. Split barrel; 9. Magnetic part; 10. Connecting hole; 11. Rope body; 12. Ball head; 13. Ball head groove; 15. Connecting thread; 16. Limit block; 17. Clamping seat; 18. Clamping unit; 19. Screw; 20. Internal groove; 21. External groove; 22. Locking hole; 23. Nut; 25. Curved top plate; 26. High-temperature buffer and wear-resistant pad.

[0018] The purpose, features and advantages of the present invention will be further described with reference to the accompanying drawings and in conjunction with the embodiments. DETAILED DESCRIPTION

[0019] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making any creative efforts shall fall within the scope of protection of the present invention.

[0020] It should be noted that all directional indications in the embodiments of the present invention, such as up, down, left, right, front, back, clockwise, counterclockwise, etc., are only used to explain the relative position relationship and movement status of the various components in a certain specific posture. If the specific posture changes, the directional indication will also change accordingly.

[0021] In addition, the descriptions of "first", "second", etc. in the present invention are for descriptive purposes only and should not be understood as indicating or implying their relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" or "second" may explicitly or implicitly include at least one of such features. In addition, the technical solutions between the various embodiments can be combined with each other, but this must be based on the fact that they can be implemented by ordinary technicians in this field. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

[0022] like Figures 1 to 5 As shown, in this embodiment, the feeding device for adding silicon material includes a clamping mechanism 1, a combined barrel 2 and a discharge mechanism 3, the clamping mechanism 1 is sleeved on the combined barrel 2, the discharge mechanism 3 includes a lifting rod 5 and a bottom cone 6, the lower end of the lifting rod 5 extends into the combined barrel 2, the bottom cone 6 is arranged at the lower end of the lifting rod 5, and is located at the lower end of the combined barrel 2, the upper end of the combined barrel 2 is provided with a cover plate 7, the combined barrel 2 includes a plurality of split barrels 8, and the plurality of split barrels 8 are connected in sequence.

[0023] When adding materials, grab the lifting rod 5, align the lower part of the bottom cone 6 with the furnace isolation valve, and open the furnace isolation valve. Further move the combined barrel 2 downward to a suitable height so that the clamping mechanism 1 is stuck on the upper part of the furnace isolation valve, and the combined barrel 2 extends into the interior of the main chamber of the single crystal furnace. Further move the lifting rod 5 downward to move the bottom cone 6 downward relative to the combined barrel 2. Further, the silicon material in the combined barrel 2 slides from both sides of the bottom cone 6 to achieve feeding.

[0024] In contrast to the deficiencies of the prior art, in the present invention, a plurality of split barrels 8 are connected in sequence to form a combined barrel 2. This allows only the broken split barrel 8 to be replaced when the combined barrel 2 is broken somewhere, thereby facilitating replacement and reducing costs. Moreover, when assembling the combined barrel 2, the number of assembled split barrels 8 can be controlled according to the amount of silicon material added to determine the height of the combined barrel 2, thereby facilitating independent selection between fewer and more additions, thereby reducing waste. Furthermore, by moving the bottom cone 6 downward relative to the combined barrel 2, the silicon material can slide down from both sides of the bottom cone 6 to achieve addition. This method of addition allows for sufficient silicon material to be added at one time, so that the feeding device for adding silicon material has the advantages of simple structure, easy replacement, reduced costs, and high feeding efficiency.

[0025] like Figure 4 As shown, in some embodiments, a magnetic attraction portion 9 is provided at both the upper and lower ends of the split barrel 8, and the split barrel 8 is connected to the adjacent split barrel 8 through the magnetic attraction portion 9. The magnetic attraction portion 9 includes a magnetic attraction layer and an isolation layer. The magnetic attraction layer is provided on the split barrel 8, and the isolation layer covers the outside of the magnetic attraction layer. The magnetic attraction portion 9 is a magnet ring formed on the split barrel 8. Specifically, a plurality of split barrels 8 are connected through the magnetic attraction portion 9 for easy assembly; secondly, by covering the outside of the magnetic attraction layer with an isolation layer, the magnetic attraction layer can be separated from the silicon material to avoid the magnetic attraction layer from contaminating the silicon material and to avoid the silicon material from affecting the magnetic attraction effect of the magnetic attraction layer; it should be noted that the isolation layer is a quartz layer, which can play the role of anti-pollution, corrosion resistance and magnetic field regulation.

[0026] like Figures 2 to 5 As shown, in some embodiments, the split barrel 8 has multiple connecting holes 10, and the upper and lower ends of the connecting holes 10 respectively pass through the upper and lower ends of the split barrel 8. The feeding device also includes multiple ropes 11, and the ropes 11 are connected between the multiple split barrels 8 through the connecting holes 10. Specifically, each split barrel 8 has three connecting holes 10 to accommodate three ropes 11, and the ropes 11 are tungsten wire ropes. Specifically, by setting up multiple rope bodies 11 to connect multiple split barrels 8, multiple split barrels 8 can be connected at the same time through the magnetic suction part 9 and the rope body 11, further making the combined barrel 2 have better stability after assembly, so as to avoid the situation where multiple split barrels 8 are squeezed and dislocated by the internal silicon material after magnetic docking and when fully loaded; secondly, by opening multiple connecting holes 10 in the split barrel 8, the rope body 11 can be connected between the multiple split barrels 8 through the connecting holes 10, which can further improve the stability after connection.

[0027] like Figure 3 and Figure 5As shown, in certain embodiments, the upper end of the rope 11 is fixedly connected to the cover plate 7. The lower end of the rope 11 extends downward from the bottommost connection hole 10 and is provided with a ball head 12. The upper end of the bottom cone 6 is provided with a ball head groove 13, and the ball head 12 is seated in the ball head groove 13. The number of ball head grooves 13 is the same as the number of ropes 11. Specifically, the upper end of the rope 11 is locked to the cover plate 7 via a nut, and the ball head 12 at the lower end of the rope 11 engages with the ball head groove 13 to prevent the assembled barrel 2 from slipping.

[0028] like Figures 2 to 3 As shown, in certain embodiments, the lower end of the lifting rod 5 is provided with a connecting thread 15 and a stopper 16. The bottom cone 6 is connected to the connecting thread 15. The stopper 16 is located at the upper end of the connecting thread 15 and abuts the upper end of the bottom cone 6. The width of the stopper 16 is greater than the width of the lifting rod 5. Specifically, the position of the stopper 16 abutting the upper end of the bottom cone 6 prevents the bottom cone 6 from being over-tightened, causing local stress on the lifting rod 5 and increasing the risk of breakage.

[0029] like Figure 6 As shown, in certain embodiments, the clamping mechanism 1 includes a clamping seat 17, which is sleeved on the combined barrel 2. The clamping seat 17 is provided with a plurality of clamping units 18, and the clamping ends of the plurality of clamping units 18 are all clamped on the combined barrel 2. Specifically, when charging, the clamping mechanism 1 is clamped on the upper part of the furnace isolation valve, allowing the combined barrel 2 to extend into the interior of the single crystal furnace main chamber for charging.

[0030] like Figure 6As shown, in some embodiments, the clamping unit 18 includes a screw 19, and the clamping seat 17 is provided with an internal groove 20, an external groove 21, and a locking hole 22. The internal groove 20 and the external groove 21 are located on the inner and outer sides of the clamping seat 17, respectively. The locking hole 22 is connected between the internal groove 20 and the external groove 21. The screw 19 is connected to the locking hole 22. One end of the screw 19 is connected to a nut 23. The width of the nut 23 is greater than the width of the external groove 21. The clamping end of the clamping unit 18 is a curved top plate 25 connected to the other end of the screw 19. The width of the curved top plate 25 is greater than the width of the internal groove 20. A high-temperature buffer and wear-resistant pad 26 is provided on the inner side of the curved top plate 25. The nut 23 is a butterfly wing nut. The diameter of the screw 19 is adapted to the groove width of the internal groove 20 and the external groove 21. The depth of the internal groove 20 and the external groove 21 are both 3 mm. Specifically, by setting the width of the nut 23 to be greater than the width of the external groove 21 and the width of the curved top plate 25 to be greater than the width of the internal groove 20, the cross-sectional structure of the clamping mechanism 1 is bow-shaped. At this time, the nut 23 is locked on the outside of the clamping seat 17 when locking and does not act on the external groove 21. At the same time, the curved top plate 25 does not act on the internal groove 20, so as to prevent the stress from being too concentrated during locking and causing damage to the annular clamping seat 17.

[0031] like Figure 3 and Figure 5 As shown, in some embodiments, the angle between the bottom cone 6 and the horizontal plane ranges from 10 degrees to 20 degrees. The outermost diameter of the bottom cone 6 is the same as the outer diameter of the split barrel 8. Specifically, when the bottom cone 6 has an excessively large angle, the kinetic energy of the rolling is converted into excessive potential energy during the feeding process, causing the silicon material to fall into the silicon liquid, resulting in a large splashing of the liquid surface; when the bottom cone 6 has a smaller angle, there is no tendency to roll down, thereby affecting the falling of the material. Therefore, by setting the above-mentioned angle range, the bottom cone 6 has a moderate angle, which can not only avoid large splashing of the liquid surface, but also not affect the falling of the material; preferably, the best effect is achieved when the angle of the bottom cone 6 is 15 degrees.

[0032] like Figure 5 As shown, in some embodiments, the bottom cone 6 is made of silicon carbide. Specifically, by making the bottom cone 6 of silicon carbide (3C-SIC cubic crystal phase), the bottom cone 6 has high hardness to resist the wear caused by the addition of various forms of silicon materials (including large blocks, small blocks, granular silicon, etc.). Moreover, the silicon carbide material of the bottom cone 6 ensures that after long-term use and reaching the end of its service life, the residue caused by the wear of the bottom cone 6 will not significantly affect the quality of the silicon material, effectively preventing the quality of the silicon material from being affected.

[0033] In addition, the present invention also provides a feeding method for the feeding device for adding silicon material, which comprises the following steps: Step S1: assemble a corresponding number of split barrels 8 according to the amount of silicon material added to form a combined barrel 2, and insert the rope 11 into the connecting hole 10 of the split barrel 8; Step S2: insert the lifting rod 5 into the combined barrel 2, and connect the bottom cone 6 to the lower end of the lifting rod 5 and locate it at the lower end of the combined barrel 2; Step S3: clamp the clamping mechanism 1 on the combined barrel 2 according to the height between the furnace isolation valve and the feeding liquid level; Step S4: Load the combined barrel 2, cover the upper end of the combined barrel 2 with the cover plate 7, and securely connect the rope 11 to the cover plate 7; Step S5: Grab the lifting rod 5, align the lower part of the bottom cone 6 with the furnace isolation valve, and open the furnace isolation valve; Specifically, the lifting rod 5 is grasped by the auxiliary chamber of the single crystal furnace.

[0034] Step S6: Move the combined barrel 2 downward to a suitable height so that the clamping mechanism 1 is clamped on the upper part of the furnace isolation valve, and the combined barrel 2 extends into the interior of the single crystal furnace main chamber; Step S7, move the lifting rod 5 downward to move the bottom cone 6 downward relative to the combined barrel 2; Step S8: The silicon material in the combined barrel 2 slides down from both sides of the bottom cone 6 to achieve material addition.

[0035] With respect to the deficiencies of the prior art, in the present invention, a plurality of split barrels 8 are connected in sequence to form a combined barrel 2. When the combined barrel 2 is broken at a certain place, only the broken split barrel 8 can be replaced, so as to facilitate replacement and reduce costs. Moreover, when assembling the combined barrel 2, the number of assembled split barrels 8 can be controlled according to the amount of silicon material added to determine the height of the combined barrel 2, so as to facilitate independent selection between fewer additions and more additions, thereby reducing waste. In addition, when adding materials, sufficient silicon material can be added at one time, so that the adding method has the advantages of easy replacement, reduced costs and high adding efficiency.

[0036] It is worth mentioning that the specific structure of the feeding device for adding silicon material adopted in the feeding method refers to the above-mentioned embodiment. Since the feeding device for adding silicon material adopts all the technical solutions of all the above-mentioned embodiments, it at least has all the beneficial effects brought by the technical solutions of the above-mentioned embodiments, which will not be described one by one here.

[0037] The above description is only a preferred embodiment of the present invention and does not limit the patent scope of the present invention. All equivalent structural transformations made by using the contents of the present invention description and drawings under the inventive concept of the present invention, or direct / indirect application in other related technical fields are included in the patent protection scope of the present invention.

Claims

1. A feeding device for adding silicon material, characterized in that: It comprises a clamping mechanism (1), a combined barrel (2) and a discharge mechanism (3), wherein the clamping mechanism (1) is sleeved on the combined barrel (2), and the discharge mechanism (3) comprises a lifting rod (5) and a bottom cone (6), wherein the lower end of the lifting rod (5) extends into the combined barrel (2), and the bottom cone (6) is arranged at the lower end of the lifting rod (5) and is located at the lower end of the combined barrel (2), and a cover plate (7) is provided at the upper end of the combined barrel (2), and the combined barrel (2) comprises a plurality of split barrels (8), and the plurality of split barrels (8) are connected in sequence.

2. The feeding device for adding silicon material according to claim 1, characterized in that: The upper and lower ends of the split barrel (8) are both provided with a magnetic attraction portion (9), and the split barrel (8) is connected to the adjacent split barrel (8) through the magnetic attraction portion (9). The magnetic attraction portion (9) includes a magnetic attraction layer and an isolation layer. The magnetic attraction layer is provided on the split barrel (8), and the isolation layer covers the outer side of the magnetic attraction layer.

3. The feeding device for adding silicon material according to claim 2, characterized in that: The split barrel (8) is provided with a plurality of connecting holes (10), the upper and lower ends of the connecting holes (10) respectively pass through the upper and lower ends of the split barrel (8), and the feeding device further comprises a plurality of rope bodies (11), the rope bodies (11) being connected between the plurality of split barrels (8) through the connecting holes (10).

4. The feeding device for adding silicon material according to claim 3, characterized in that: The upper end of the rope body (11) is fixedly connected to the cover plate (7), the lower end of the rope body (11) extends from the top to the bottom of the connecting hole (10) and is provided with a ball head (12), the upper end of the bottom cone (6) is provided with a ball head groove (13), and the ball head (12) is fitted into the ball head groove (13).

5. The feeding device for adding silicon material according to claim 1, characterized in that: The lower end of the lifting rod (5) is provided with a connecting thread (15) and a limiting block (16), the bottom cone (6) is connected to the connecting thread (15), and the limiting block (16) is located at the upper end of the connecting thread (15) and abuts against the upper end of the bottom cone (6).

6. The feeding device for adding silicon material according to claim 1, characterized in that: The clamping mechanism (1) comprises a clamping seat (17), the clamping seat (17) is sleeved on the combined barrel (2), a plurality of clamping units (18) are provided on the clamping seat (17), and the clamping ends of the plurality of clamping units (18) are all clamped on the combined barrel (2).

7. The feeding device for adding silicon material according to claim 6, characterized in that: The clamping unit (18) includes a screw (19), and the clamping seat (17) is provided with an inner groove (20), an outer groove (21) and a locking hole (22). The inner groove (20) and the outer groove (21) are respectively located on the inner side and the outer side of the clamping seat (17). The locking hole (22) is connected between the inner groove (20) and the outer groove (21). The screw (19) is connected to the locking hole (22). One end of the screw (19) is connected to a nut (23). The width of the nut (23) is greater than the width of the outer groove (21). The clamping end of the clamping unit (18) is a curved top plate (25) connected to the other end of the screw (19). The width of the curved top plate (25) is greater than the width of the inner groove (20). A high-temperature buffer wear-resistant pad (26) is provided on the inner side of the curved top plate (25).

8. The feeding device for adding silicon material according to claim 1, characterized in that: The angle between the bottom cone (6) and the horizontal plane ranges from 10 degrees to 20 degrees.

9. The feeding device for adding silicon material according to claim 1 or 8, characterized in that: The material of the bottom cone (6) is silicon carbide.

10. A feeding method for a feeding device for adding silicon material according to claim 3, characterized in that: It includes the following steps: Step S1, assembling a corresponding number of split barrels (8) according to the amount of added silicon material to form a combined barrel (2), and inserting the rope (11) into the connecting hole (10) of the split barrel (8); Step S2: insert the lifting rod (5) into the combined barrel (2), and connect the bottom cone (6) to the lower end of the lifting rod (5) and position it at the lower end of the combined barrel (2); Step S3, clamping the clamping mechanism (1) on the combined barrel (2) according to the height between the furnace isolation valve and the feeding liquid level; Step S4, loading the combined barrel (2), covering the upper end of the combined barrel (2) with the cover plate (7), and fixing the rope body (11) to the cover plate (7); Step S5: grab the lifting rod (5), align the lower part of the bottom cone (6) with the furnace isolation valve, and open the furnace isolation valve; Step S6, moving the combined barrel (2) downward to a suitable height so that the clamping mechanism (1) is clamped on the upper part of the furnace isolation valve, and the combined barrel (2) extends into the interior of the single crystal furnace main chamber; Step S7, moving the lifting rod (5) downward, so that the bottom cone (6) moves downward relative to the combined barrel (2); Step S8: The silicon material in the combined barrel (2) slides down from both sides of the bottom cone (6) to achieve material addition.

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