Secondary feeding device for crystal pulling of single crystal furnace and single crystal furnace

Abstract

The utility model relates to the field of secondary feeding during crystal pulling, in particular to a secondary feeding device for crystal pulling of a single crystal furnace and the single crystal furnace. The cover plate is correspondingly arranged at the top opening of the feeding hopper, and a feeding opening used for adding a silicon material is formed in the cover plate; the feeding anti-blocking mechanism is arranged in the feeding hopper; a first feeding opening is formed in the top of the discharging bin; the discharging plate is arranged in the discharging bin, the outer side wall of the discharging plate and the inner side wall of the discharging bin are correspondingly attached and connected in a sealed mode, and a first discharging opening is formed in the discharging plate; and the top of the automatic discharging mechanism is provided with a second feeding port, the bottom of the automatic discharging mechanism is provided with a discharging port, the second feeding port corresponds to the first discharging port, and the automatic discharging mechanism is used for accurately controlling the discharging speed. According to the feeding device, uniform discharging can be realized, the feeding speed of secondary feeding into the crucible of the single crystal furnace can be accurately controlled, and blockage caused by too high feeding speed can be avoided.

Description

Technical Field

[0001] This utility model relates to the field of secondary feeding during crystal pulling, specifically to a secondary feeding device for crystal pulling in a single crystal furnace and a single crystal furnace. Background Technology

[0002] In the operation of a Czochralski single crystal furnace, a secondary feeding device is usually used to achieve continuous crystal pulling. Traditional secondary feeding devices for single crystal furnaces mostly adopt simple mechanical structures, adding silicon material into the crucible by gravity or simple pushing. These devices have many problems, such as uneven feeding, difficulty in controlling the feeding speed, and blockage during the feeding process.

[0003] The shortcomings of existing technology:

[0004] 1. Unsatisfactory feeding speed control: The feeding speed cannot be flexibly adjusted according to the actual needs of single crystal growth, making it difficult to meet the requirements of continuous crystal pulling process.

[0005] 2. Blockage during feeding: The feeding speed cannot be controlled during the feeding process. If the feeding speed is too fast, blockage of material blocks may occur.

[0006] 3. Uneven feeding: The feeding speed is uncontrollable, resulting in uneven feeding. Utility Model Content

[0007] The purpose of this invention is to provide a secondary feeding device for single crystal furnace crystal pulling, which can achieve uniform feeding, accurately control the feeding speed of secondary feeding into the crucible of single crystal furnace, and prevent blockage due to excessive feeding speed.

[0008] Another objective of this invention is to provide a single crystal furnace that can achieve uniform feeding, precisely control the feeding speed of secondary feeding into the crucible of the single crystal furnace, and prevent blockage caused by excessive feeding speed.

[0009] The technical solution of this utility model is implemented as follows:

[0010] A secondary feeding device for single crystal furnace crystal pulling includes:

[0011] The feed hopper is funnel-shaped and has a circular first discharge pipe at the bottom;

[0012] A cover plate is provided at the top opening of the feed hopper, and the cover plate has a feeding port for adding silicon material;

[0013] A feeding anti-blocking mechanism is installed inside the feeding hopper to prevent the silicon material from clogging during the feeding process;

[0014] The discharge hopper has a first inlet at its top;

[0015] A feeding plate is disposed in the discharge hopper. The outer side wall of the feeding plate is correspondingly attached to and sealed to the inner side wall of the discharge hopper. A first feeding port is provided on the feeding plate.

[0016] An automatic feeding mechanism is provided, with a second feeding port at the top and a discharging port at the bottom. The second feeding port is corresponding to the first discharging port. The automatic feeding mechanism is used to precisely control the discharging speed.

[0017] Furthermore, the feed anti-blocking mechanism includes a drive component, a drive shaft, and a spiral blade. The drive component is mounted on the cover plate, and the output shaft of the drive component is connected to the drive shaft. The spiral blade is disposed on the outer side of the bottom of the drive shaft. The spiral blade is located inside the first feed tube, and the drive shaft, the spiral blade, and the central axis of the first feed tube are collinear.

[0018] The outer wall of the spiral blade has a first gap with the inner wall of the first feeding tube, and the size of the first gap is smaller than the size of the silicon material.

[0019] Furthermore, the automatic feeding mechanism includes a support, a connecting rod, a housing, a rotating shaft, a rotating body, and a discharge hopper;

[0020] The top of the support is fixedly connected to the feeding plate, and the bottom is fixedly connected to the bottom plate of the discharge hopper;

[0021] One end of the connecting rod is fixedly connected to the support part, and the other end of the connecting rod is provided with a housing. The upper end of the housing is provided with the second feed port. The center of the inner cavity of the housing is provided with a rotating shaft. The two ends of the rotating shaft are respectively rotatably connected to the two sides of the housing. A rotating body is sleeved on the outer wall of the rotating shaft. Multiple gear teeth are evenly arranged on the outer wall of the rotating body. A material loading groove is formed between two adjacent gear teeth. A second gap is formed between the outer side wall of the gear teeth and the inner side wall of the housing. The size of the second gap is smaller than the size of the silicon material.

[0022] The lower end of the housing has a second discharge port, and the discharge hopper is correspondingly provided with the second discharge port. The bottom of the discharge hopper is provided with a discharge pipe, and the end of the discharge pipe is the discharge port.

[0023] Furthermore, a slot is provided on the rotating shaft, and a locking block is provided on the rotating body, the locking block being correspondingly engaged in the slot;

[0024] Alternatively, the rotating body may have a slot, and the rotating shaft may have a locking block, which may be engaged in the slot.

[0025] Furthermore, one side of the discharge hopper is fixedly connected to the support part, and a pipe hole is opened on the bottom plate of the discharge bin, through which the discharge pipe passes.

[0026] Furthermore, the cross-sectional shape of the discharge pipe is consistent with the cross-sectional shape of the pipe hole, and the outer sidewall of the discharge pipe is correspondingly fitted to the inner sidewall of the pipe hole.

[0027] Furthermore, the feeding plate is a conical plate, and the first feeding port is opened at the center of the feeding plate. A second feeding pipe is provided at the bottom of the first feeding port, and the second feeding pipe is located inside the second feeding port.

[0028] Furthermore, a feeding cover is provided at the feeding port, the feeding cover is hinged to the cover plate, and a handle is provided on the feeding cover.

[0029] Furthermore, the driving component is a motor, which is mounted on the top of the cover plate, and the output shaft of the motor is vertically inserted through the cover plate and connected and fixed to the driving shaft;

[0030] Multiple support columns are connected between the bottom of the feed hopper and the top of the discharge hopper.

[0031] A single crystal furnace includes a secondary feeding device for crystal pulling.

[0032] Compared with the prior art, the beneficial effects of this utility model are:

[0033] This application provides a secondary feeding device for crystal pulling in a single crystal furnace. It can add silicon raw materials from the loading port into the feeding hopper. The automatic feeding mechanism can precisely control the feeding speed (i.e., the feeding speed of adding materials into the crucible of the single crystal furnace), so that the feeding is uniform and achieves stable and continuous feeding. The feeding anti-blocking mechanism can effectively prevent the silicon raw materials from blocking during the feeding process, and will not cause blockage due to excessive feeding speed, thus ensuring smooth feeding. Attached Figure Description

[0034] To more clearly illustrate the technical solutions of the embodiments of this utility model, the drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this utility model and should not be regarded as a limitation on the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0035] Figure 1 This is a three-dimensional structural diagram of the secondary feeding device of this utility model;

[0036] Figure 2This is a schematic diagram of the feeding anti-blocking mechanism of this utility model;

[0037] Figure 3 This is a partial cross-sectional view of the automatic feeding mechanism of this utility model;

[0038] Figure 4 This utility model Figure 1 A schematic diagram of the cross-sectional structure;

[0039] Figure 5 for Figure 4 Enlarged view of a portion of point A in the middle.

[0040] In the picture:

[0041] 1-Discharge bin; 101-Base plate; 2-Support column; 3-Feed anti-blocking mechanism; 4-Receiving cavity; 5-Discharge plate; 6-Second discharge pipe; 7-Cavity; 8-Automatic discharge mechanism;

[0042] 31-Feed hopper; 32-Cover plate; 33-Feeding cover; 34-Handle; 35-Drive component; 36-Drive shaft; 37-Spiral blade; 38-First discharge pipe;

[0043] 81-Support; 82-Connecting rod; 83-Housing shell; 84-Second feed port; 85-Rotation shaft; 86-Rotating body; 87-Gear teeth; 88-Carrying trough; 89-Second discharge port; 810-Discharge hopper; 811-Discharge port; 812-Slot; 813-Slot block. Detailed Implementation

[0044] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. The components of the embodiments of this utility model described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0045] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention.

[0046] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0047] 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., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the product of this utility model is in use. They 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. Therefore, they should not be construed as limitations on this utility model. In addition, the terms "first," "second," and "third," etc., are only used to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0048] Furthermore, terms such as "horizontal," "vertical," and "sag" do not imply that components must be absolutely horizontal or suspended, but rather that they can be slightly tilted. For example, "horizontal" simply means that its direction is more horizontal relative to "vertical," and does not mean that the structure must be completely horizontal, but can be slightly tilted.

[0049] In the description of this utility model, it should also be noted that, unless otherwise explicitly specified and limited, the terms "set," "install," "connect," and "link" 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.

[0050] The following detailed description, in conjunction with the accompanying drawings, outlines some embodiments of the present invention. Unless otherwise specified, the following embodiments and features can be combined with each other.

[0051] Example 1

[0052] Please see Figures 1-5 This embodiment provides a technical solution: a secondary feeding device for crystal pulling in a single crystal furnace, used for secondary feeding into the crucible during continuous crystal pulling in a single crystal furnace, and capable of precisely controlling the feeding speed (i.e., the discharge speed, or the final addition speed at which silicon raw material is discharged into the crucible). The secondary feeding device includes:

[0053] The feeding hopper 31 is funnel-shaped and has a circular first discharge pipe 38 at its bottom;

[0054] A cover plate 32 is provided at the top opening of the feed hopper 31, and the cover plate 32 has a feeding port for adding silicon material;

[0055] The feeding anti-blocking mechanism 3 is installed inside the feeding hopper 31 to prevent the silicon material from blocking during the feeding process;

[0056] Discharge bin 1, the top of which is provided with a first feed inlet;

[0057] The feeding plate 5 is disposed in the discharge bin 1. The outer side wall of the feeding plate 5 is correspondingly attached to and sealed to the inner side wall of the discharge bin 1. The feeding plate 5 is provided with a first feeding port.

[0058] An automatic feeding mechanism 8 is provided with a second feeding port 84 at the top and a discharging port 811 at the bottom. The second feeding port 84 is provided in correspondence with the first discharging port. The automatic feeding mechanism 8 is used to precisely control the discharging speed.

[0059] The top of the discharge hopper 1 is provided with a support column 2, and multiple support columns 2 are connected between the bottom of the feed hopper 31 and the top of the discharge hopper 1.

[0060] The silicon material is fed from the feed port and accumulates in the inner cavity of the feed hopper 31.

[0061] The feed anti-clogging mechanism 3 includes a drive component 35, a drive shaft 36, and a spiral blade 37. The drive component 35 is mounted on the cover plate 32, and the output shaft of the drive component 35 is connected to the drive shaft 36. The spiral blade 37 is disposed on the outer side of the bottom of the drive shaft 36. The first feed pipe 38 is a circular tube, and the spiral blade 37 is located inside the first feed pipe 38. The drive shaft 36, the spiral blade 37, and the central axis of the first feed pipe 38 are collinear. The outer wall of the spiral blade 37 has a first gap with the inner wall of the first feed pipe 38. The size of the first gap is smaller than the size of the silicon material. The first gap is a small gap, and its size is smaller than the size of the silicon material to prevent the silicon material from leaking out through the first gap.

[0062] The drive unit 35 can be a motor, which drives the drive shaft 36 and the spiral blade 37 to rotate. The silicon material accumulated in the inner cavity of the feed hopper 31 can be discharged from the first discharge pipe 38 through the rotation of the spiral blade 37. By controlling the speed of the motor, the discharge speed of the silicon material from the first discharge pipe 38 can be controlled, so that the silicon material can smoothly enter the discharge hopper 1, thereby preventing the silicon material from clogging.

[0063] The inner cavity of the discharge chamber 1 and the space above the discharge plate 5 form a receiving cavity 4, into which silicon material falling from the first discharge pipe 38 enters the receiving cavity 4. Preferably, the discharge plate 5 is a conical plate with a low center and a high outer side. The first discharge port is opened at the center of the discharge plate 5 so that the silicon material entering the receiving cavity 4 can fall smoothly into the first discharge port along the conical surface of the discharge plate 5. A second discharge pipe 6 is provided at the bottom of the first discharge port. The second discharge pipe 6 is located inside the second feed port 84. All the silicon material falling from the first discharge port enters the second feed port 84 at the top of the automatic feeding mechanism 8 through the second discharge pipe 6.

[0064] The bottom of the discharge bin 1 is a base plate 101. A cavity 7 is formed inside the discharge bin 1 and between the base plate 101 and the discharge plate 5. The automatic discharge mechanism 8 is located inside the cavity 7.

[0065] The automatic feeding mechanism 8 includes a support part 81, a connecting rod 82, a housing 83, a rotating shaft 85, a rotating body 86, and a discharge hopper 810. The top of the support part 81 is fixedly connected to the feeding plate 5, and the bottom is fixedly connected to the bottom plate 101 of the discharge hopper 1. One end of the connecting rod 82 is fixedly connected to the support part 81, and the other end of the connecting rod 82 is provided with the housing 83. The upper end of the housing 83 is provided with the second feed port 84. The rotating shaft 85 is provided at the center of the inner cavity of the housing 83. The two ends of the rotating shaft 85 are rotatably connected to the two sides of the housing 83, respectively. The rotating body 86 is sleeved on the outer wall of the rotating shaft 85. Multiple gear teeth 87 are evenly arranged on the outer wall of the rotating body 86. Preferably, the gear teeth 87 and the rotating body 86 are designed as an integral molding structure. A material loading groove 88 is formed between two adjacent gear teeth 87. Silicon material entering the second feed port 84 falls into the material loading groove 88 and, due to its own gravity, drives the rotating body 86 to rotate automatically around its rotation axis 85. When the silicon material is rotated to the second discharge port 89, it is discharged from the second discharge port 89. A second gap is formed between the outer wall of the gear teeth 87 and the inner wall of the housing 83. This second gap is a small gap, smaller than the size of the silicon material, to prevent leakage. If the silicon material leaks from the second gap, it will not only affect the rotation of the rotating body 86 but also the accuracy of the discharge speed. Therefore, the second gap is designed to be as small as possible, just enough to ensure that the outermost edge of the gear teeth 87 does not contact the inner wall of the housing 83. The middle part of the housing 83 is designed to be circular to accommodate the rotation of the rotating body 86.

[0066] The lower end of the housing 83 has a second discharge port 89. The discharge hopper 810 is correspondingly arranged with the second discharge port 89. The upper part of the discharge hopper 810 is located around the second discharge port 89. The bottom of the discharge hopper 810 is provided with a discharge pipe. The end of the discharge pipe is the discharge port 811. The material discharged from the second discharge port 89 smoothly enters the discharge hopper 810 and is discharged from the discharge port 811.

[0067] Specifically, one side of the discharge hopper 810 is fixedly connected to the support part 81, and a pipe hole is opened on the bottom plate 101 of the discharge bin 1, through which the discharge pipe passes. The cross-sectional shape of the discharge pipe is consistent with the cross-sectional shape of the pipe hole, and the outer side wall of the discharge pipe corresponds to and fits against the inner side wall of the pipe hole. With this design, the upper part of the discharge hopper 810 is fixedly connected to the support part 81, and the lower part is correspondingly fitted into the pipe hole of the bottom plate 101, so that the discharge hopper 810 is fixed and stable.

[0068] The automatic feeding mechanism 8 enables precise control of the discharge speed, achieving stable and continuous feeding into the crucible of the single crystal furnace. The rotating shaft 85 rotates under the weight of the silicon material, causing the rotating body 86 and its gear teeth 87 to rotate together. After entering the housing 83 from the feed inlet, the silicon material falls into the loading trough 88 and gradually moves to the second discharge port 89 as the rotating body 86 rotates. Due to the annular and equidistant arrangement of the loading trough 88, the material can fall evenly and quantitatively from the discharge port, and then enter the crucible of the single crystal furnace through the discharge hopper 810 and discharge port 811. This design not only improves the accuracy and stability of the feeding but also effectively avoids the problem of unstable feeding speed caused by the simple structure of traditional conveyor belt feeding devices.

[0069] In this embodiment, the rotating shaft 85 is provided with a slot 812, and the rotating body 86 is provided with a locking block 813, which is correspondingly engaged with the slot 812; or, the rotating body 86 is provided with a slot 812, and the rotating shaft 85 is provided with a locking block 813, which is correspondingly engaged with the slot 812. The locking block 813 matches the slot 812, and through the design of the slot 812 and the locking block 813, the rotating shaft 85 and the rotating body 86 are locked together and fixed, making them connected as one unit. When silicon material enters the loading tank 88, the rotating shaft 85 and the rotating body 86 rotate together.

[0070] Preferably, symmetrical slots 812 are designed on opposite sides of the outer wall of the rotation shaft 85, and symmetrical locking blocks 813 are arranged on opposite sides of the inner wall of the rotating body 86, such as... Figure 5 As shown, this makes the snap-fit ​​fixing of the rotation shaft 85 and the rotating body 86 more secure.

[0071] A feeding cover 33 is provided at the feeding port. The feeding cover 33 is hinged to the cover plate 32. A handle 34 is provided on the feeding cover 33. In its natural state, the feeding cover 33 rests on the top edge of the feeding hopper 31. The handle 34 makes it easy to lift the feeding cover 33 to open the feeding port for feeding.

[0072] The driving component 35 is a motor, which is installed at the center of the top of the cover plate 32. The motor is inverted and its output shaft passes vertically through the cover plate 32 and is connected and fixed to the driving shaft 36.

[0073] The automatic feeding mechanism 8 can precisely control the feeding speed inside the crucible of the single crystal furnace. During operation, the raw material is added from the top cover 33 into the feed hopper 31. The motor is started, driving the drive shaft 36 and the spiral blades 37 to rotate. The spiral blades 37 push the silicon material in the conical hopper 31 downwards. The material enters the receiving cavity 4 of the discharge bin 1 through the first feeding pipe 38, falls onto the feeding plate 5, and then, by its own weight, enters the first feeding port along the conical surface of the feeding plate 5, finally falling into the automatic feeding mechanism 8. The second feeding port 84 at the upper end of the housing 83 of the automatic feeding mechanism 8 is connected to the second feeding pipe 6. After entering the housing 83, the raw material falls into the loading tank 88. During the pulling process of the single crystal furnace, the weight of the raw material drives the rotation shaft 85, the rotating body 86, and the wheel. The gear 87 rotates slowly, causing the raw material in the loading tank 88 to gradually move to the second discharge port 89 as the rotating body 86 rotates. The raw material falls from the second discharge port 89 into the discharge hopper 810, and finally from the discharge port 811 into the single crystal furnace, achieving the purpose of precisely controlling the feeding speed. Through the set rotation shaft 85, the outer wall of the rotation shaft 85 is sleeved with the rotating body 86, and the outer wall of the rotating body 86 is fixed with the gear 87. When the motor is working, the quantitative silicon raw material in the loading tank 88 can drive the rotating body 86 to rotate in the middle of the inner cavity of the shell 83, so that the raw material in the loading tank 88 can be fed evenly, preventing the feeding from being too fast or too slow. Moreover, through the set loading tank 88, the raw material can be quantitatively controlled, further improving the feeding accuracy.

[0074] Example 2

[0075] A single crystal furnace includes a crucible and a secondary feeding device for crystal pulling, the secondary feeding device being used to uniformly add silicon raw material into the crucible.

[0076] The beneficial effects of the technical solution of this utility model are:

[0077] 1. The feeding anti-blocking mechanism 3 effectively prevents the silicon material from clogging during the feeding process, ensuring smooth feeding. The funnel-shaped design of the feeding hopper 31 allows the silicon material to flow smoothly into the discharge hopper 1. The rotation of the motor-driven rotating rod and spiral blade 37 further promotes the uniform falling of the material, avoiding clogging. In addition, the feeding speed of the material can be precisely controlled to ensure the stability and controllability of the single crystal furnace pulling single crystal rod process. After the material enters the discharge hopper 1 from the feeding cover 33, it is uniformly and slowly conveyed into the receiving tank of the discharge hopper 1 by the rotation of the drive shaft 36 and spiral blade 37, and discharged through the feeding plate 5 and the second feeding pipe 6, thereby preventing the material from clogging.

[0078] 2. The automatic feeding mechanism 8 enables the equipment to precisely control the feeding speed, achieving a stable and continuous feeding process. The rotating shaft 85 rotates under the weight of the raw material, driving the rotating body 86, its gear teeth 87, and the material loading trough 88 to rotate together. After the raw material enters the housing 83 from the feed inlet, it falls into the material loading trough 88 and gradually moves to the discharge port 811 as the rotating body 86 rotates. Due to the annular and equidistant arrangement of the material loading trough 88, the raw material can fall evenly and quantitatively from the feeding port, and then enter the single crystal furnace through the discharge hopper 810 and the discharge port 811. This arrangement not only improves the accuracy and stability of feeding, but also effectively avoids the problem of unstable feeding speed caused by the simple structure of traditional conveyor belt feeding devices.

[0079] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model, and are not intended to limit it. Although the utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this utility model.

[0080] The above description is merely a preferred embodiment of this utility model and is not intended to limit the utility model. Various modifications and variations can be made to this utility model by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A secondary feeding device for single crystal furnace crystal pulling, characterized in that, include: Feed hopper (31), the feed hopper (31) is funnel-shaped, and the bottom of the feed hopper (31) has a circular first discharge pipe (38); A cover plate (32) is provided at the top opening of the feed hopper (31), and the cover plate (32) is provided with a feeding port for adding silicon material; A feeding anti-blocking mechanism (3) is installed inside the feeding hopper (31) to prevent the silicon material from blocking during the feeding process; The discharge bin (1) has a first inlet at its top; A feeding plate (5) is provided in the discharge bin (1). The outer side wall of the feeding plate (5) is correspondingly attached to and sealed to the inner side wall of the discharge bin (1). A first feeding port is provided on the feeding plate (5). An automatic feeding mechanism (8) is provided with a second feeding port (84) at the top and a discharging port (811) at the bottom. The second feeding port (84) is provided in correspondence with the first discharging port. The automatic feeding mechanism (8) is used to precisely control the discharging speed.

2. The secondary feeding device for single crystal furnace crystal pulling according to claim 1, characterized in that, The feed anti-blocking mechanism (3) includes a drive component (35), a drive shaft (36), and a spiral blade (37). The drive component (35) is mounted on the cover plate (32). The output shaft of the drive component (35) is connected to the drive shaft (36). The spiral blade (37) is arranged on the outer side of the bottom of the drive shaft (36). The spiral blade (37) is located inside the first feed tube (38), and the drive shaft (36), the spiral blade (37), and the central axis of the first feed tube (38) are collinear. The outer wall of the spiral blade (37) has a first gap with the inner wall of the first feed tube (38), and the size of the first gap is smaller than the size of the silicon material.

3. The secondary feeding device for single crystal furnace crystal pulling according to claim 1, characterized in that, The automatic feeding mechanism (8) includes a support (81), a connecting rod (82), a housing (83), a rotation shaft (85), a rotating body (86), and a discharge hopper (810); The top of the support (81) is fixedly connected to the feeding plate (5), and the bottom is fixedly connected to the bottom plate (101) of the discharge bin (1); One end of the connecting rod (82) is fixedly connected to the support part (81), and the other end of the connecting rod (82) is provided with a housing (83). The upper end of the housing (83) is provided with a second feed port (84). A rotating shaft (85) is provided at the center of the inner cavity of the housing (83). The two ends of the rotating shaft (85) are respectively rotatably connected to the two sides of the housing (83). A rotating body (86) is sleeved on the outer wall of the rotating shaft (85). A plurality of gear teeth (87) are evenly arranged on the outer wall of the rotating body (86). A material loading groove (88) is formed between two adjacent gear teeth (87). A second gap is formed between the outer side wall of the gear teeth (87) and the inner side wall of the housing (83). The size of the second gap is smaller than the size of the silicon material. The lower end of the housing (83) has a second discharge port (89), and the discharge hopper (810) is correspondingly provided with the second discharge port (89). The bottom of the discharge hopper (810) is provided with a discharge pipe, and the end of the discharge pipe is the discharge port (811).

4. The secondary feeding device for single crystal furnace crystal pulling according to claim 3, characterized in that, The rotating shaft (85) is provided with a slot (812), and the rotating body (86) is provided with a locking block (813), which is correspondingly engaged in the slot (812); Alternatively, the rotating body (86) may have a slot (812) and the rotating shaft (85) may have a locking block (813) that is locked into the slot (812).

5. The secondary feeding device for single crystal furnace crystal pulling according to claim 3, characterized in that, One side of the discharge hopper (810) is fixedly connected to the support part (81), and a pipe hole is opened on the bottom plate (101) of the discharge bin (1), and the discharge pipe passes through the pipe hole.

6. The secondary feeding device for single crystal furnace crystal pulling according to claim 5, characterized in that, The cross-sectional shape of the discharge pipe is consistent with the cross-sectional shape of the pipe hole, and the outer side wall of the discharge pipe is correspondingly fitted to the inner side wall of the pipe hole.

7. The secondary feeding device for single crystal furnace crystal pulling according to claim 1, characterized in that, The feeding plate (5) is a conical plate. The first feeding port is opened at the center of the feeding plate (5). The second feeding pipe (6) is provided at the bottom of the first feeding port. The second feeding pipe (6) is located inside the second feeding port (84).

8. The secondary feeding device for single crystal furnace crystal pulling according to claim 1, characterized in that, A feeding cover (33) is provided at the feeding port. The feeding cover (33) is hinged to the cover plate (32). A handle (34) is provided on the feeding cover (33).

9. The secondary feeding device for single crystal furnace crystal pulling according to claim 2, characterized in that, The driving component (35) is a motor, which is installed on the top of the cover plate (32). The output shaft of the motor passes vertically through the cover plate (32) and is connected and fixed to the driving shaft (36). Multiple support columns (2) are connected between the bottom of the feed hopper (31) and the top of the discharge bin (1).

10. A single crystal furnace, characterized in that, Includes the secondary feeding device for single crystal furnace crystal pulling as described in any one of claims 1-9.

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