CN218951558U - Pulling device and single crystal furnace - Google Patents

Abstract

The utility model relates to a pulling device and a single crystal furnace, wherein the pulling device comprises a frame body, a winding component and a guiding component, the frame body is arranged at the top of the single crystal furnace, the winding component is arranged on the frame body, the winding component comprises a cable pipe, and the cable pipe can rotate around a vertical axis and simultaneously slide along the vertical axis so as to wind and lift a seed crystal rope; the guide component is arranged on the frame body and positioned on one side of the winding component along the horizontal direction, and the guide component is used for guiding the seed crystal rope extending into the frame body along the vertical direction to extend along the horizontal direction. When the cable pipe slides along the vertical direction, the gravity center of the cable pipe is invariable in the horizontal direction all the time, so that the whole gravity center of the equipment is prevented from shifting to one side in the horizontal direction under the condition that a counterweight structure is not added, the stability of the equipment is ensured, and the quality of products is ensured; since the guide assembly is located at one side of the winding assembly in the horizontal direction, the size of the whole equipment in the vertical direction can be prevented from being increased.

Description

Pulling device and single crystal furnace

Technical Field

The utility model relates to the technical field of monocrystalline silicon crystal pulling, in particular to a pulling device and a monocrystalline furnace.

Background

In a pulling apparatus for a single crystal furnace, a seed rope is generally extended into the pulling apparatus in a vertical direction, and a cable tube is horizontally moved to one side while rotating to wind and receive and lift the seed rope. Because the cable tube can shift the gravity center of the whole equipment to one side when horizontally moving, the stability of the equipment is reduced, and the quality of products is reduced.

The part of the lifting device is provided with a counterweight structure so as to ensure the stability of the equipment. However, the weight construction generally results in a larger volume and weight of the device as a whole.

Disclosure of Invention

In view of the foregoing, it is desirable to provide a pulling apparatus and a single crystal growing furnace that can ensure stability of the apparatus during operation without increasing the overall weight of the apparatus and the dimension in the vertical direction.

The utility model first provides a pulling device for a single crystal furnace, comprising: the frame body is arranged at the top of the single crystal furnace; the winding assembly is arranged on the frame body and comprises a cable pipe, and the cable pipe can rotate around a vertical axis and simultaneously slide along the vertical axis so as to retract and release a seed crystal rope; and the guide assembly is arranged on one side of the winding assembly along the horizontal direction and is used for guiding the seed crystal rope extending into the frame along the vertical direction to extend to the winding assembly along the horizontal direction.

In the pulling device, the cable tube can slide in the vertical direction while rotating around a vertical axis so as to retract and release the seed crystal rope and wind the seed crystal rope on the outer surface of the cable tube; when the cable pipe slides along the vertical direction, the gravity center of the cable pipe is always unchanged in the horizontal direction, so that the stability of the equipment is prevented from being reduced due to the fact that the gravity center of the whole equipment is deviated to one side in the horizontal direction, and the quality of products is ensured; meanwhile, the equipment can be stabilized without adding a counterweight structure, and the guide assembly is positioned on one side of the winding assembly along the horizontal direction, so that the whole weight of the equipment can be prevented from being increased or the whole size of the equipment along the vertical direction can be increased, and the equipment is convenient to transport and assemble.

In one embodiment, the guide assembly includes a first pulley and a second pulley spaced apart in a vertical direction, the first pulley and the second pulley each rotating about a horizontal axis.

So set up, seed rope can change the extending direction through twining on first pulley and second pulley.

In one embodiment, the axis of the first pulley and the axis of the second pulley have an inclination therebetween.

The seed crystal rope and the first pulley or the second pulley can be prevented from being interfered, and meanwhile, the seed crystal rope and the seed crystal rope can be prevented from being interfered with each other.

In one embodiment, the first pulley comprises a first wire inlet end and a first wire outlet end, the second pulley comprises a second wire inlet end and a second wire outlet end, and the first wire outlet end and the second wire inlet end are arranged at intervals along the vertical direction.

The seed crystal rope can be directly wound on the second pulley from the second wire inlet end after being led out from the first wire outlet end, and the seed crystal rope is prevented from being required to obliquely extend between the first pulley and the second pulley to interfere with other elements in the frame body.

In one embodiment, the winding assembly is provided with a third wire inlet end, and the second wire outlet end and the third wire inlet end are arranged at intervals along the horizontal direction.

The seed crystal rope can be directly wound on the cable pipe from the third wire inlet end after being led out from the second wire outlet end, and interference of other elements in the frame body caused by inclined extension of the seed crystal rope between the second pulley and the cable pipe is avoided.

In one embodiment, the guide assembly further comprises a stop for limiting the seed rope from exiting the first pulley and/or the second pulley.

So set up, the locating part can prevent that the seed crystal rope from deviating from the pulley groove of first pulley and second pulley, guarantees the stability when seed crystal rope twines on first pulley and second pulley.

In one embodiment, the pulling device further comprises a rotating assembly rotatably arranged at the top of the single crystal furnace, the frame body is arranged at the top of the rotating assembly, the rotating assembly is provided with a through hole communicated with the single crystal furnace and the frame body, and the through hole is used for penetrating the seed crystal rope.

So set up, the rotation component is used for guiding the seed crystal rope to the support body in the support body pivoted simultaneously.

In one embodiment, a magnetic fluid is disposed within the rotating assembly.

By the arrangement, the magnetic fluid can keep the sealing state of the rotating assembly and the frame body in the rotating process.

In one embodiment, the lifting device further comprises a conductive slip ring arranged at the top of the frame body, and the conductive slip ring comprises a fixing part and a rotating part capable of synchronously rotating along with the frame body; the lifting device further comprises a fixing component used for limiting the fixing part to rotate along with the frame body.

The fixed part of the conductive slip ring is electrically connected with an external power supply, and supplies power to the elements synchronously rotating along with the frame body through the rotating part.

The utility model also provides a single crystal furnace, which comprises the lifting device.

Drawings

In order to more clearly illustrate the technical solutions of embodiments or conventional techniques of the present application, the drawings that are required to be used in the description of the embodiments or conventional techniques will be briefly described below, and it is apparent that the drawings in the following description are only some embodiments of the present application, and other drawings may be obtained according to these drawings without inventive effort for a person of ordinary skill in the art.

Fig. 1 is a schematic perspective view of a pulling device according to an embodiment of the present utility model;

fig. 2 is a schematic diagram of a partial perspective view of a pulling device according to the present utility model;

FIG. 3 is a schematic perspective view of a guide assembly according to the present utility model;

FIG. 4 is a schematic perspective view of a guiding assembly and a winding assembly according to the present utility model;

FIG. 5 is a schematic perspective view of a rotary assembly according to the present utility model;

fig. 6 is a schematic diagram of a partial three-dimensional structure of a pulling device according to the present utility model;

fig. 7 is a schematic cross-sectional view of a winding assembly according to the present utility model.

Reference numerals: 1. a frame body; 11. a first housing; 111. a first opening; 12. a second housing; 121. a second opening; 2. a winding assembly; 21. a cable tube; 211. a guide hole; 22. a third wire inlet end; 23. a screw rod; 24. a nut; 25. a second drive assembly; 251. a drive shaft; 252. a guide member; 253. a second driving member; 3. a guide assembly; 31. a first pulley; 311. a first wire inlet end; 312. a first wire outlet end; 32. a second pulley; 321. a second wire inlet end; 322. a second wire outlet end; 33. a limiting piece; 331. a first limit part; 332. a second limit part; 34. a first bracket; 35. a second bracket; 36. a gravity sensor; 4. a rotating assembly; 41. a fixing member; 42. a rotating member; 5. a first drive assembly; 51. a first driving member; 52. a first transmission member; 53. a second transmission member; 54. a synchronous belt; 6. a conductive slip ring; 61. a fixing part; 62. a rotating part; 7. a fixing member; 71. a third bracket; 72. an anti-rotation bracket; 8. a seed crystal rope; 9. and (5) balancing weights.

Detailed Description

In order to make the above objects, features and advantages of the present application more comprehensible, embodiments accompanied with figures are described in detail below. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present application. This application is, however, susceptible of embodiment in many other forms than those described herein and similar modifications can be made by those skilled in the art without departing from the spirit of the application, and therefore the application is not to be limited to the specific embodiments disclosed below.

It will be understood that when an element is referred to as being "mounted" or "disposed" on another element, it can be directly on the other element or intervening elements may also be present. When a component is considered to be "connected" to another component, it can be directly connected to the other component or intervening components may also be present. The terms "vertical," "horizontal," "upper," "lower," "left," "right," and the like are used in the description of the present application for purposes of illustration only and do not represent the only embodiment.

Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include at least one such feature. In the description of the present application, the meaning of "plurality" is at least two, such as two, three, etc., unless explicitly defined otherwise.

In this application, unless expressly stated or limited otherwise, a first feature "up" or "down" a second feature may be a direct contact of the first feature with the second feature, or an indirect contact of the first feature with the second feature via an intervening medium. Moreover, a first feature being "above," "over" and "on" a second feature may be a first feature being directly above or obliquely above the second feature, or simply indicating that the first feature is higher in level than the second feature. The first feature being "under", "below" and "beneath" the second feature may be the first feature being directly under or obliquely under the second feature, or simply indicating that the first feature is less level than the second feature.

Unless defined otherwise, all technical and scientific terms used in the specification of this application have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used in the description of the present application is for the purpose of describing particular embodiments only and is not intended to be limiting of the present application. The term "and/or" as used in the specification of this application includes any and all combinations of one or more of the associated listed items.

In a pulling apparatus for a single crystal furnace, a seed rope is generally extended into the pulling apparatus in a vertical direction, and a cable tube is horizontally moved to one side while rotating to wind and receive and lift the seed rope. Because the cable tube can shift the gravity center of the whole equipment to one side when horizontally moving, the stability of the equipment is reduced, and the quality of products is reduced. The part of the lifting device is provided with a counterweight structure so as to ensure the stability of the equipment. However, the weight construction generally results in a larger volume and weight of the device as a whole.

In order to solve the above problems, as shown in fig. 1 to 7, the present utility model firstly provides a pulling device capable of ensuring stability of the apparatus when operating without increasing the overall weight of the apparatus and the dimension in the vertical direction.

As shown in fig. 1 and 4, in particular, the pulling device is used for a single crystal furnace (not shown), and comprises a frame body 1, a winding assembly 2 and a guiding assembly 3, wherein the frame body 1 is arranged at the top of the single crystal furnace, the winding assembly 2 is arranged on the frame body 1, the winding assembly 2 comprises a cable pipe 21, and the cable pipe 21 can rotate around a vertical axis and simultaneously slides along the vertical axis so as to retract a seed crystal rope 8; the guiding component 3 is disposed on the frame 1 and located at one side of the winding component 2 along the horizontal direction, and the guiding component 3 is used for guiding the seed crystal rope 8 extending into the frame 1 along the vertical direction (i.e. the +y axis direction as shown in fig. 4) to extend to the winding component 2 along the horizontal direction (i.e. the +x axis direction as shown in fig. 4).

As described above, the cable tube of the existing pulling apparatus needs to move horizontally to one side when receiving and lifting the seed rope, so that the center of gravity of the whole apparatus shifts to one side, resulting in reduced stability of the apparatus and reduced quality of the product; part of seed crystal lifting device is provided with the counter weight structure and guarantees the stability of equipment, however, counter weight structure can generally lead to the holistic volume and the weight of equipment great, and equipment transportation and assembly are difficult. In the pulling device provided by the utility model, the cable tube 21 can slide in the vertical direction while rotating around a vertical axis, namely the + -Y-axis direction shown in fig. 4, so as to retract and release the seed crystal rope 8 and wind the seed crystal rope 8 on the outer surface of the cable tube 21; when the cable tube 21 slides along the vertical direction, the gravity center of the cable tube 21 is always unchanged in the horizontal direction, so that the stability of the equipment is prevented from being reduced due to the fact that the gravity center of the whole equipment is deviated to one side in the horizontal direction, and the quality of products is ensured. The guide assembly 3 is capable of guiding the seed rope 8 extending in the vertical direction to extend in the horizontal direction, facilitating winding of the seed rope 8 onto the cable tube 21. Meanwhile, the equipment can be stabilized without adding a counterweight structure, so that the whole volume and weight of the equipment can be prevented from being increased, and the equipment is convenient to transport and assemble.

Also, in the prior art in which the cable tube moves in the horizontal direction, the seed rope is extended into the pulling device in the vertical direction, and thus a guide assembly for guiding the cable tube is generally disposed in the vertical direction with the cable tube. Because the single crystal furnace is large in size along the vertical direction, when the existing pulling device is arranged at the top of the single crystal furnace, the size of the whole equipment along the vertical direction can be further increased. In the pulling device provided by the utility model, the guide component 3 is positioned at one side of the winding component 2 along the horizontal direction, so that the size of the pulling device along the vertical direction is not increased, and the size of the whole device along the vertical direction can be prevented from being increased.

As shown in fig. 3 and 4, the guide assembly 3 includes a first pulley 31 and a second pulley 32 arranged at intervals in the vertical direction, and the first pulley 31 and the second pulley 32 are respectively rotated about a horizontal axis. After the seed crystal rope 8 stretches into the frame body 1 along the +Y direction, the seed crystal rope 8 is sequentially wound on the first pulley 31 and the second pulley 32, the seed crystal rope 8 can be changed into the extending direction through winding on the first pulley 31 and the second pulley 32 and finally is changed into the extending direction along the +X direction to the cable tube 21, and the seed crystal rope 8 can be wound on the outer peripheral wall of the cable tube 21 through rotation of the cable tube 21.

In the illustrated embodiment, the first pulley 31 is disposed on top of the second pulley 32 with an inclination angle between the axis of the first pulley 31 and the axis of the second pulley 32. Thus, the seed crystal rope 8 can be prevented from interfering with the second pulley 32 when being wound on the first pulley 31, and meanwhile, the seed crystal rope 8 which is led out from the second pulley 32 can be prevented from interfering with the seed crystal rope 8 which is led in from the first pulley 31, so that the quality of products is prevented from being influenced. Of course, in other embodiments, the axis of the first pulley 31 may be parallel to the axis of the second pulley 32, as long as the extending direction of the seed string 8 can be changed.

As shown in fig. 4, the first pulley 31 includes a first wire inlet end 311 and a first wire outlet end 312, and the second pulley 32 includes a second wire inlet end 321 and a second wire outlet end 322, and the first wire outlet end 312 and the second wire inlet end 321 are arranged at intervals in the vertical direction. The winding assembly 2 is provided with a third wire inlet end 22, and the second wire outlet end 322 and the third wire inlet end 22 are arranged at intervals along the horizontal direction. Thus, the seed string 8 can freely hang down to extend in the-Y direction after being taken out from the first wire outlet end 312, and is wound directly around the second pulley 32 from the second wire inlet end 321; the seed rope 8 can be extended in the +x direction after being taken out from the second wire outlet end 322, and wound directly around the cable tube 21 from the third wire inlet end 22. Avoiding the need for the seed-rope 8 to extend obliquely between the first pulley 31 and the second pulley 32, or between the second pulley 32 and the cable tube 21, while interfering with other components within the frame body 1.

As shown in fig. 4, the guide assembly 3 further includes a stopper 33, and the stopper 33 includes a first stopper 331 for restricting the seed string 8 from coming out of the first pulley 31 and a second stopper 332 for restricting the seed string 8 from coming out of the second pulley 32. The first limiting portion 331 extends along the outer circumference of the first pulley 31 and is located between the first wire inlet end 311 and the first wire outlet end 312, and the second limiting portion 332 extends along the outer circumference of the second pulley 32 and is located between the second wire inlet end 321 and the second wire outlet end 322. The first and second limiting portions 331 and 332 can prevent the seed rope 8 from coming out of the pulley grooves of the first and second pulleys 31 and 32, and ensure stability when the seed rope 8 is wound around the first and second pulleys 31 and 32. Of course, only one of the first and second stopper portions 331 and 332 may be provided.

As shown in fig. 3, the guiding assembly 3 further includes a gravity sensor 36 disposed at the top of the first pulley 31, the first pulley 31 and the second pulley 32 are vertically disposed, and the first wire outlet end 312 and the second wire inlet end 321 are disposed at intervals along the vertical direction, so as to ensure that the gravity sensor 36 is stressed vertically.

As shown in fig. 1, the frame 1 includes a first housing 11 and a second housing 12 fixed to each other, the guide assembly 3 is disposed in the first housing 11, and the winding assembly 2 is disposed in the second housing 12. As shown in fig. 1 and 6, a side wall of the first casing 11 and the second casing 12 connected to each other is provided with a first opening 111, a side wall of the second casing 12 and the first casing 11 connected to each other is provided with a second opening 121 corresponding to the first opening 111, the first opening 111 and the second opening 121 are used for communicating the first casing 11 and the second casing 12, the first opening 111 and the second opening 121 are located on the same horizontal line with the second wire outlet end 322 and the third wire inlet end 22, and the seed rope 8 sequentially passes through the first opening 111 and the second opening 121 and extends to the third wire inlet end 22 after being wire-outlet from the second wire outlet end 322.

The first housing 11 and the second housing 12 are of a sealed structure in an assembled state, and in a use process, the inside of the first housing 11 and the inside of the second housing 12 need to be vacuumized. The first case 11 and the second case 12 may be made of a vacuum-resistant and high-temperature-resistant material such as graphite.

As shown in fig. 4, the guide assembly 3 further includes a first bracket 34 and a second bracket 35 fixedly disposed in the first housing 11, the first pulley 31 is rotatably disposed on the first bracket 34, and the second pulley 32 is rotatably disposed on the second bracket 35. The first bracket 34 and the second bracket 35 may be separate structures or may be an integral structure.

As shown in fig. 1 and 5, the pulling apparatus further includes a rotating assembly 4 rotatably disposed at the top of the single crystal furnace, the rotating assembly 4 includes a fixing member 41 fixedly disposed at the top of the single crystal furnace and a rotating member 42 rotating relative to the fixing member 41, the first housing 11 is disposed at the top of the rotating member 42, and the rotating assembly 4 is provided with a through hole (not shown) communicating the single crystal furnace with the frame 1, and the through hole is used for penetrating the seed crystal rope 8. In this way, the rotation assembly 4 can guide the seed string 8 into the frame body 1 while driving the frame body 1 to rotate. A third opening (not shown) communicated with the through hole is formed in the bottom wall of the first shell 11, the rotating assembly 4 can drive the whole frame body 1 to rotate relative to the single crystal furnace, the seed crystal rope 8 in the single crystal furnace can sequentially penetrate through the through hole and the third opening and then enter the first shell 11, and the third opening, the through hole and the first wire inlet end 311 are all located on the same vertical straight line. Wherein, be equipped with the magnetic current in the rotating assembly 4, the magnetic current can realize that rotating assembly 4 and support body 1 keep sealed state in the rotation in-process.

As shown in fig. 1, since the rotation axis of the frame body 1 is located on the first housing 11, in order to ensure the balance of the frame body 1, a side surface of the first housing 11 far away from the second housing 12 is further provided with a balancing weight 9, so as to ensure the stability of the frame body 1 in the rotation process, and avoid the inclination of the frame body 1 to affect the product quality. And, balancing weight 9 is directly installed on first casing 11, and the space of this lifting device is fully utilized, has reduced the overall dimension of whole equipment.

As shown in fig. 5, the pulling device further comprises a first driving assembly 5, and the first driving assembly 5 is used for driving the rotating member 42 of the rotating assembly 4. The first driving assembly 5 includes a first driving member 51, the first driving member 51 may be configured as a driving motor, the driving motor includes an output shaft, the first driving assembly 5 further includes a first transmission member 52 and a second transmission member 53 that are in transmission fit, the first transmission member 52 is disposed on the output shaft, the second transmission member 53 is disposed on the rotating member 42, and the first transmission member 52 and the second transmission member 53 may be configured as gears meshed with each other and transmitted through teeth, and may also be configured as a synchronous pulley and transmitted through a synchronous belt 54.

As shown in fig. 1 to 2, the lifting device further includes a conductive slip ring 6 disposed at the top of the frame 1, where the conductive slip ring 6 includes a fixing portion 61 and a rotating portion 62 capable of rotating synchronously with the frame 1; the pulling device further comprises a fixing member 7 for restricting the rotation of the fixing portion 61 with the frame body 1. The fixing member 7 includes a third bracket 71 fixed with respect to the rotation member 42 of the rotation assembly 4 and an anti-rotation bracket 72 fixedly connecting the third bracket 71 and the fixing member 41 of the rotation assembly 4. The fixing member 7 can prevent the fixing portion 61 from rotating synchronously with the frame body 1, and ensure the stability of the fixing portion 61. The fixing portion 61 of the conductive slip ring 6 is used for being electrically connected to an external power source, and supplies power to the elements that rotate synchronously with the frame body 1 through the rotating portion 62.

As shown in fig. 4 and 7, the winding assembly 2 further includes a screw rod 23 and a nut 24 disposed in the second housing 12, the screw rod 23 is fixedly disposed in the second housing 12 and extends in a vertical direction, the nut 24 is sleeved on the screw rod 23 and is in threaded engagement with the screw rod 23, and the cable tube 21 is coaxially fixed with the nut 24. Since the cable tube 21 is disposed coaxially with the nut 24 and the nut 24 is disposed coaxially with the lead screw 23, the cable tube 21 is also disposed coaxially with the lead screw 23. The winding assembly 2 further comprises a second driving assembly 25, the second driving assembly 25 can drive the cable tube 21 to rotate around the axis of the screw rod 23, the cable tube 21 can drive the nut 24 to rotate around the screw rod 23, and the nut 24 can drive the cable tube 21 to slide along the screw rod 23 in the vertical direction while rotating due to the fact that the nut 24 and the screw rod 23 are in threaded fit, so that the cable tube 21 can slide along the screw rod 23 in the vertical direction while rotating around the axis of the screw rod 23.

Wherein, the second driving assembly 25 comprises a driving shaft 251 and a guide piece 252 extending along the vertical direction, and the cable tube 21 is eccentrically provided with a guide hole 211 penetrating along the vertical direction; the guide piece 252 is slidably inserted into the guide hole 211, and the driving shaft 251 is used for driving the guide piece 252 to rotate the cable tube 21 and the nut 24 around the wire rod 23. The length of the screw rod 23 and the guide piece 252 along the vertical direction is only required to be equal to or slightly greater than the sum of the stroke of the cable tube 21 and the length of the cable tube 21 along the vertical direction, so that the cable tube 21 can slide along the screw rod 23 along the vertical direction, and the whole volume and the weight of the equipment can be prevented from being increased.

As shown in fig. 1, the second driving assembly 25 further includes a second driving member 253 provided outside the second housing 12 for driving the driving shaft 251, and the second driving member 253 may be provided as a driving motor or the like.

The utility model also provides a single crystal furnace, which comprises the pulling device, wherein the pulling device is arranged at the top of the single crystal furnace.

The technical features of the above-described embodiments may be arbitrarily combined, and all possible combinations of the technical features in the above-described embodiments are not described for brevity of description, however, as long as there is no contradiction between the combinations of the technical features, they should be considered as the scope of the description.

The above examples only represent a few embodiments of the present application, which are described in more detail and are not to be construed as limiting the scope of the claims. It should be noted that it would be apparent to those skilled in the art that various modifications and improvements could be made without departing from the spirit of the present application, which would be within the scope of the present application. Accordingly, the scope of the present application is to be determined by the following claims.

Claims (10)

1. A pulling apparatus for a single crystal growing furnace, comprising:

the frame body (1) is arranged at the top of the single crystal furnace;

the winding assembly (2) is arranged on the frame body (1), the winding assembly (2) comprises a cable pipe (21), and the cable pipe (21) can rotate around a vertical axis and simultaneously slide along the vertical axis so as to retract the seed crystal rope (8); and

the guide assembly (3) is arranged on the frame body (1) and is positioned on one side of the winding assembly (2) along the horizontal direction, and the guide assembly (3) is used for guiding the seed crystal rope (8) extending into the frame body (1) along the vertical direction to extend to the winding assembly (2) along the horizontal direction.

2. The lifting device according to claim 1, wherein the guide assembly (3) comprises a first pulley (31) and a second pulley (32) arranged at intervals in the vertical direction, the first pulley (31) and the second pulley (32) rotating about a horizontal axis, respectively.

3. A lifting device according to claim 2, characterized in that the axis of the first pulley (31) and the axis of the second pulley (32) have an inclination therebetween.

4. The pulling device according to claim 2, wherein the first pulley (31) comprises a first wire inlet end (311) and a first wire outlet end (312), the second pulley (32) comprises a second wire inlet end (321) and a second wire outlet end (322), and the first wire outlet end (312) and the second wire inlet end (321) are arranged at intervals along a vertical direction.

5. The pulling device according to claim 4, wherein the winding assembly (2) is provided with a third wire inlet end (22), and the second wire outlet end (322) is arranged at intervals in the horizontal direction from the third wire inlet end (22).

6. The pulling device according to claim 2, characterized in that the guiding assembly (3) further comprises a stop (33), the stop (33) being adapted to limit the seed string (8) from coming out of the first pulley (31) and/or the second pulley (32).

7. The pulling device according to claim 1, further comprising a rotating assembly (4) rotatably arranged at the top of the single crystal furnace, wherein the frame body (1) is arranged at the top of the rotating assembly (4), the rotating assembly (4) is provided with a through hole communicated with the single crystal furnace and the frame body (1), and the through hole is used for penetrating the seed crystal rope (8).

8. A lifting device according to claim 7, characterized in that a magnetic fluid is provided in the rotating assembly (4).

9. The lifting device according to claim 1, further comprising a conductive slip ring (6) arranged on top of the frame body (1), wherein the conductive slip ring (6) comprises a fixing portion (61) and a rotating portion (62) capable of rotating synchronously with the frame body (1);

the lifting device further comprises a fixing assembly (7) used for limiting the fixing part (61) to rotate along with the frame body (1).

10. A single crystal furnace comprising a pulling apparatus according to any one of claims 1 to 9.

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