Raw polycrystalline silicon powder automatic screening tool for single crystal drawing

Abstract

The utility model provides a primary polycrystalline silicon powder automatic screening tool for single crystal drawing, which comprises a base, a primary polycrystalline silicon powder screening device, a primary polycrystalline silicon powder screening device and a primary polycrystalline silicon powder screening device, the turntable is arranged at the end part of the output shaft of the motor, and the turntable and the output shaft of the motor are coaxially arranged; the crank-link mechanism is in power connection with the turntable; the screening basket is connected with the other end of the crank connecting rod mechanism, and the screening basket can be driven by the crank connecting rod mechanism to do reciprocating motion in the horizontal direction; wherein the screening basket is at least provided with two screens with different screen hole sizes, and the screen with the larger screen hole size is located above the screen with the smaller screen hole size. According to the tool, inconvenience existing in the manual operation process can be reduced, the operation intensity is effectively reduced, and in the screening process, it can be avoided that too much dust is raised, and the surrounding environment is affected.

Description

TECHNICAL FIELD

[0001] The utility model relates to single crystal drawing in powder screening equipment technical field, concretely relates to a kind of single crystal drawing with raw polycrystalline silicon powder automatic screening tooling. BACKGROUND

[0002] At present, the quality of silicon material plays a very important role in the process of single crystal silicon pulling rod, and the inspection of silicon material needs to be strictly controlled. In the process of silicon material inspection, especially for calculating the proportion of powder with particle size less than 1mm or particle size between 1-3mm in each bag of silicon material, there is no suitable screening tool to screen the powder from the silicon material, so it is necessary to manually pour the silicon material into the mesh screen for screening, and then the powder in the whole bag of silicon material is screened several times, which is complicated, inconvenient and time-consuming and laborious. In addition, when manually pouring the silicon material into the mesh screen and screening the powder through the mesh screen, dust is easily flying, which affects the surrounding environment. SUMMARY

[0003] The utility model provides a kind of single crystal drawing with raw polycrystalline silicon powder automatic screening tooling to solve the problem of complicated operation process, time-consuming and laborious when manually screening the powder with particle size less than 1mm and particle size between 1-3mm. The tooling can realize semi-automatic screening of the powder in the silicon material, not only reducing the inconvenience of manual operation, but also effectively reducing the operation intensity, and avoiding raising too much dust to affect the surrounding environment during screening.

[0004] The utility model adopts the technical scheme of:

[0005] A kind of single crystal drawing with raw polycrystalline silicon powder automatic screening tooling is provided, comprising:

[0006] A base is provided with a motor at the top;

[0007] A turntable is arranged at the output shaft end of the motor, and the turntable and the output shaft of the motor are coaxially arranged;

[0008] A crank connecting rod mechanism is connected with the power of the turntable;

[0009] A screening basket is connected with the other end of the crank connecting rod mechanism, and the screening basket can reciprocate in the horizontal direction under the driving of the crank connecting rod mechanism;

[0010] Among them, the screening basket is provided with at least two screens with different mesh sizes, and the screen with larger mesh size is located above the screen with smaller mesh size.

[0011] Optionally, the crank connecting rod mechanism comprises a first connecting rod and a second connecting rod, the first connecting rod is eccentrically arranged on the outer wall of the rotating disc, the other end of the first connecting rod is rotationally connected with the second connecting rod, and the other end of the second connecting rod is hingedly connected with the screening basket.

[0012] Optionally, the top of the base is provided with a vertical plate, a first sliding groove is formed in the vertical plate towards the side of the screening basket along the movement direction of the screening basket, a sliding rod is arranged on the outer wall of the screening basket, and the sliding rod is slidably connected with the vertical plate through the first sliding groove.

[0013] Optionally, the screening basket comprises a first screening basket unit and a second screening basket unit, the screen comprises a first screen and a second screen, the first screen is arranged in the first screening basket unit, the second screen is arranged in the second screening basket unit, the bottom of the first screening basket unit is provided with a clasp, and the outer diameter of the clasp is equal to the inner diameter of the second screening basket unit.

[0014] Optionally, a connecting column is arranged between the second connecting rod and the screening basket, a fixing seat is arranged on the side wall of the connecting column, the second connecting rod is hingedly connected with the fixing seat, the connecting column is provided with a first limiting groove from top to bottom along the height direction of the connecting column, and a first limiting block is arranged on the outer wall of the screening basket and slidably connected with the connecting column through the first limiting groove.

[0015] Optionally, the top of the base is provided with a vertical plate, a first sliding groove is formed in the vertical plate towards the side of the screening basket along the movement direction of the screening basket, a sliding rod is arranged on the outer wall of the screening basket, and the sliding rod is slidably connected with the vertical plate through the first sliding groove.

[0016] Optionally, the inside of the vertical plate is provided with a second sliding groove in communication with the first sliding groove, the other end of the sliding rod is provided with a second limiting block, and the second limiting block is slidably connected with the vertical plate through the second sliding groove.

[0017] Optionally, the outer diameter of the second limiting block is greater than the outer diameter of the sliding rod.

[0018] Optionally, the top of the vertical plate is provided with an opening in communication with the first sliding groove and the second sliding groove, and the opening is used for the sliding rod and the second limiting block to enter.

[0019] Optionally, the bottom of the vertical plate is further provided with a second limiting groove along the length direction of the vertical plate, and the connecting plate is slidably connected with the vertical plate through the second limiting groove.

[0020] Optionally, the top of the first screening basket unit is buckled with a cover plate.

[0021] The beneficial effects of the utility model are as follows:

[0022] 1、The silicon material is poured into the screening basket, the silicon material is accumulated on the screen mesh inside the screening basket, then the motor is started, the output shaft of the motor rotates, the output shaft drives the rotating disc to rotate, the rotating disc drives the screening basket at the other end of the crank connecting rod mechanism to move through the crank connecting rod mechanism, so that the screening basket can reciprocate in the horizontal direction, thereby screening the silicon material on the screen mesh with different mesh sizes in the screening basket, without manual participation, and the screening efficiency of the silicon material is improved;

[0023] 2、When the motor rotates, the output shaft of the motor drives the rotating disc to rotate, the rotating disc drives the screening basket to reciprocate through the crank connecting rod mechanism, in the process of reciprocating of the screening basket, the speed of the screening basket changes in the process of moving to the relatively flat, so that the silicon material in the screening basket is avoided from being violently collided to the inner wall of the screening basket to cause dust to be raised in the process of screening on the screen mesh, thereby affecting the detection environment. BRIEF DESCRIPTION OF DRAWINGS

[0024] In order to more clearly illustrate the technical solutions of the embodiments of the present application or the prior art, the drawings needed to be used in the embodiments or the prior art description will be briefly introduced below. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can also be obtained by those skilled in the art without creative labor.

[0025] Figure 1 It is a perspective view of a kind of single crystal drawing with native polycrystalline silicon powder automatic screening tooling structure schematic diagram;

[0026] Figure 2 It is Figure 1 The top view of figure 1;

[0027] Figure 3 It is Figure 1 The side view of figure 1;

[0028] Figure 4 It is the top view of screening basket;

[0029] Figure 5 It is the structure schematic diagram of screening basket;

[0030] Figure 6 It is the perspective view of vertical plate.

[0031] Reference signs:

[0032] 1-base;2-motor;3-rotating disc;

[0033] 4-crank connecting rod mechanism, 40-first connecting rod, 41-second connecting rod;

[0034] 5-connection column, 50-first limit slot, 51-fixed seat;

[0035] 6-screening basket, 60-first screening basket monomer, 601-first screen, 602-clamp, 61-second screening basket monomer, 611-second screen, 62-first limit block, 63-sliding rod, 64-second limit block;

[0036] 7-stand, 70-first sliding groove, 71-second sliding groove, 72-opening, 73-second limit groove;

[0037] 8-connection plate, 9-gap. DETAILED DESCRIPTION

[0038] In the description of the utility model, it is understood that the orientation or positional relationship indicated by the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential" are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the utility model and simplifying the description, and therefore cannot be understood as limiting the utility model.

[0039] The following disclosure provides many different embodiments or examples for implementing different structures of the utility model. In order to simplify the disclosure of the utility model, the components and settings of specific examples are described below. Of course, they are only examples, and the purpose is not to limit the utility model.

[0040] The embodiments of the utility model will be described in detail below with reference to the drawings. EMBODIMENT

[0041] As Figure 1 shown, the embodiment discloses an automatic screening tool for single crystal pulling with raw polycrystalline silicon powder, which comprises:

[0042] The base 1 is provided with a motor 2 at the top;

[0043] The turntable 3 is arranged at the output shaft end of the motor 2, and the turntable 3 and the output shaft of the motor 2 are coaxially arranged;

[0044] The crank connecting rod mechanism 4 is connected with the turntable 3;

[0045] The screening basket 6 is connected with the other end of the crank connecting rod mechanism 4, and the screening basket 6 can reciprocate in the horizontal direction under the driving of the crank connecting rod mechanism 4;

[0046] The screening basket 6 is provided with at least two screens with different screen sizes, and the screen with larger screen size is located above the screen with smaller screen size.

[0047] In use, the silicon material is first poured into the screening basket 6, and then the motor 2 is started to drive the output shaft to rotate, and the other end of the output shaft drives the rotating disc 3 to rotate. In the process of rotating, the rotating disc 3 drives the screening basket 6 at the other end of the crank connecting rod mechanism 4 to move through the power connection, so that the screening basket 6 can reciprocate in the horizontal direction, so that the silicon material in the screening basket 6 is screened on the screen in the screening basket 6. The screen in the screening basket 6 gradually reduces the screen size from top to bottom, so that the silicon material can be screened into powder with different particle diameters for collection. The second connecting rod 41 on the side wall also moves with the rotating disc 3 to make a circular motion around the center of the rotating disc 3. When the powder in the screening basket 6 is collected after being screened by the screen, a collection box with the same inner diameter as the screening basket 6 can be placed inside the screening basket 6. The collection box can reciprocate with the screening basket 6 and collect the screened powder, avoiding the powder falling on the base 1 and being affected by the reciprocating screening basket 6.

[0048] In one embodiment, as shown in Figure 1 and Figure 2 The crank connecting rod mechanism 4 includes a first connecting rod 40 and a second connecting rod 41. The first connecting rod 40 is eccentrically arranged on the outer wall of the rotating disc 3, and the other end of the first connecting rod 40 is rotatably connected with the second connecting rod 41. The other end of the second connecting rod 41 is hingedly connected with the screening basket 6.

[0049] In use, the crank connecting rod mechanism 4 can convert the circular motion of the rotating disc 3 into the reciprocating motion of the screening basket 6 in the horizontal direction, so as to realize the screening of the silicon material in the screening basket 6. Specifically, the crank connecting rod mechanism 4 includes a first connecting rod 40 and a second connecting rod 41. The first connecting rod 40 is arranged on the outer wall of the rotating disc 3, and the first connecting rod 40 is arranged at a position deviating from the center of the rotating disc 3. The other end of the first connecting rod 40 is rotatably connected with one end of the second connecting rod 41. The other end of the second connecting rod 41 is hingedly connected with the outer wall of the screening basket 6. When the motor 2 drives the rotating disc 3 to rotate, the first connecting rod 40 will move along with the rotating disc 3 to make a circular motion around the center of the rotating disc 3. The rotation of the first connecting rod 40 drives one end of the second connecting rod 41 to also make a circular motion around the center of the rotating disc 3. The other end of the second connecting rod 41 is hingedly connected with the screening basket 6. Due to the influence of gravity, the screening basket 6 is always in contact with the top of the bottom plate. In addition, the second connecting rod 41 is always driven to rotate by the first connecting rod 40. Therefore, the circular motion of the rotating disc 3 can be converted into the reciprocating motion of the screening basket 6 in the horizontal direction.

[0050] In one embodiment, as shown inFigure 1 and Figure 6 As shown, the top of the base 1 is provided with a vertical plate 7. The side of the vertical plate 7 facing the screening basket 6 is provided with a first sliding groove 70 along the movement direction of the screening basket 6. The outer wall of the screening basket 6 is provided with a sliding rod 63, which is slidably connected to the vertical plate 7 through the first sliding groove 70.

[0051] In use, the slide rod 63 is slidably connected to the upright plate 7 via the first slide groove 70, allowing the screening basket 6 to avoid tilting upwards during horizontal movement with the cooperation of the slide rod 63 and the upright plate 7. Specifically, the upright plate 7 is perpendicular to the base 1, and the length direction of the upright plate 7 is the same as the movement direction of the screening basket 6 on the base 1. The upright plate 7 on the base 1 does not affect the reciprocating movement of the screening basket 6 in the horizontal direction. The first slide groove 70 is formed on the side wall of the upright plate 7 facing the screening basket 6, and the groove direction of the first slide groove 70 is consistent with the movement direction of the screening basket 6. Simultaneously, the slide rod 63 is set along its radius on the outer wall of the screening basket 6, and the slide rod 63 is slidably connected to the upright plate 7 via the first slide groove 70. When the screening basket 6 reciprocates, the slide rod 63 on the outer wall of the screening basket 6 is restricted by the upright plate 7 to prevent the screening basket 6 from tilting upwards.

[0052] In the above embodiment, the number of upright plates 7 can be increased to two. When there are two upright plates 7, the two upright plates 7 are symmetrically arranged with the diameter direction of the screening basket 6 as the axis of symmetry. The first sliding groove 70 is opened on the opposite surface of the two upright plates 7. The two upright plates 7 can enhance the guiding and limiting effect on the screening basket 6.

[0053] In one embodiment, such as Figure 1 , Figure 2 and Figure 4 As shown, the screening basket 6 includes a first screening basket unit 60 and a second screening basket unit 61. The screen includes a first screen 601 and a second screen 611. The first screen 601 is located inside the first screening basket unit 60, and the second screen 611 is located inside the second screening basket unit 61. The bottom of the first screening basket unit 60 is provided with a retaining ring 602, and the outer diameter of the retaining ring 602 is equal to the inner diameter of the second screening basket unit 61.

[0054] In use, the bottom of the first screening basket unit 60 is clamped between the snap ring 602 and the second screening basket unit 61, which facilitates the disassembly of the first screening basket unit 60 and the second screening basket unit 61, and also prevents the relative displacement between the first screening basket unit 60 and the second screening basket unit 61 when the second screening basket unit 61 moves along with the crank connecting rod mechanism 4, so as to prevent the first screening basket unit 60 from falling off the second screening basket unit 61. Specifically, the screening basket 6 is divided into the first screening basket unit 60 and the second screening basket unit 61 along the direction of the cross section of the screening basket 6, and the first screening basket unit 60 is located above the second screening basket unit 61. The snap ring 602 is arranged at the bottom of the first screening basket unit 60, the central axis of the snap ring 602 is coaxial with the central axis of the first screening basket unit 60, and the outer diameter of the snap ring 602 is equal to the inner diameter of the second screening basket unit 61, so that when the first screening basket unit 60 is placed above the second screening basket unit 61, the first screening basket unit 60 can be clamped on the second screening basket unit 61 through the snap ring 602, and the relative displacement between the first screening basket unit 60 and the second screening basket unit 61 is prevented when the second screening basket unit 61 moves along with the connecting column 5, so as to prevent the first screening basket unit 60 from falling off the second screening basket unit 61.

[0055] In one embodiment, as shown in Figure 2 and Figure 3 The second connecting rod 41 and the screening basket 6 are provided with a connecting column 5, the side wall of the connecting column 5 is provided with a fixing seat 51, the second connecting rod 41 is hinged to the fixing seat 51, the connecting column 5 is provided with a first limiting groove 50 from top to bottom along the height direction of the connecting column 5, and the outer wall of the screening basket 6 is provided with a first limiting block 62, and the first limiting block 62 is slidably connected to the connecting column 5 through the first limiting groove 50.

[0056] In use, the first limiting block 62 outside the side wall of the second screening basket unit 61 is slidably connected between the first limiting groove 50 and the connecting column 5, so that the first limiting block 62 can move up and down on the connecting column 5 along the height direction of the connecting column 5, and the second screening basket unit 61 can also be moved up and down, thereby achieving the loading and unloading operation of the second screening basket unit 61 on the connecting column 5. Specifically, the first limiting groove 50 is arranged on the side wall of the connecting column 5 facing the screening basket 6, and the grooves of the first limiting groove 50 are respectively located on the top and the side wall of the connecting column 5. The first limiting block 62 is installed on the side wall of the second screening basket unit 61 by means of bolt connection, and the first limiting block 62 is located outside the second screening basket unit 61, so that the first limiting block 62 can be slid into the first limiting groove 50, thereby facilitating the loading and unloading of the second screening basket unit 61 on the connecting column 5.

[0057] In one embodiment, as shown in Figure 3As shown, the top of the base 1 is in sliding contact with a connecting plate 8, and a connecting column 5 is vertically arranged on the top of the connecting plate 8, and there is a gap 9 between the connecting plate 8 and the bottom of the screening basket 6.

[0058] In use, the connecting plate 8 can reciprocate along with the connecting column 5 driven by the crank connecting rod mechanism 4, and the gap 9 between the connecting plate 8 and the bottom of the screening basket 6 can be used to collect the last screened powder. Specifically, the connecting plate 8 is laid on the base 1, and the connecting plate 8 can slide on the base 1. The bottom of the connecting column 5 is fixedly connected with the connecting plate 8, that is, when the connecting column 5 moves, it slides on the base 1 through the connecting plate 8. The gap 9 between the connecting plate 8 and the bottom of the screening basket 6 is used to collect the screened powder smaller than mm, and the specific collection method is to lay a collection bag on the connecting plate 8 to collect the screened powder smaller than mm without the need of using other tools to collect the screened powder smaller than mm onto the base 1. In addition, the gap 9 between the bottom of the screening basket 6 and the connecting plate 8 should not be too large, otherwise it is easy to cause dust to be raised after the powder falls onto the collection bag on the connecting plate 8, which affects the surrounding environment.

[0059] In one embodiment, as shown in Figure 2 、 Figure 4 and Figure 6 , the inner part of the vertical plate 7 is provided with a second sliding groove 71 communicating with the first sliding groove 70, and the other end of the sliding rod 63 is provided with a second limiting block 64 which is slidingly connected with the vertical plate 7 through the second sliding groove 71.

[0060] In this embodiment, the outer diameter of the second limiting block 64 is larger than the outer diameter of the sliding rod 63.

[0061] In use, the second limiting block 64 at the other end of the sliding rod 63 is slidingly connected with the vertical plate 7 through the second sliding groove 71, which can limit the screening basket 6. Specifically, the inner part of the vertical plate 7 is provided with a second sliding groove 71 communicating with the first sliding groove 70, and the other end of the sliding rod 63 is provided with a second limiting block 64 which is slidingly connected with the vertical plate 7 through the second sliding groove 71. After the two are connected in communication, a T-shaped groove with a T-shaped cross section is formed, that is, the outer diameter of the second limiting block 64 is larger than the outer diameter of the sliding rod 63, which can limit the screening basket 6 in another direction perpendicular to the movement direction of the screening basket 6 during the horizontal movement of the screening basket 6, that is, the screening basket 6 has a tendency to swing left and right during the reciprocating movement in the horizontal direction.

[0062] In the above embodiment, when the screening basket 6 is assembled with the vertical plate 7 through the slide rod 63 and the second limiting block 64, the connecting column 5 at this time should be at the critical point position in the reciprocating movement process of itself, so as to prevent the connecting column 5 and the connection between the first connecting rod 40 and the connecting column 5 and the connection between the slide rod 63 and the screening basket 6 from being damaged after the screening basket 6 is assembled into the vertical plate 7 and the vertical plate 7 limits the movement of the screening basket 6 with the start of the motor 2.

[0063] In one of the embodiments, as shown in Figure 2 and Figure 6 , the top of the vertical plate 7 is provided with an opening 72 communicating with the first sliding groove 70 and the second sliding groove 71 for the entry of the slide rod 63 and the second limiting block 64.

[0064] In use, the opening 72 is provided at the top of the vertical plate 7 and close to one end of the screening basket 6 in a direction perpendicular to the base 1, the opening 72 communicates with the first sliding groove 70 and the second sliding groove 71, and the opening 72 enables the slide rod 63 and the second limiting block 64 to enter, so that the slide rod 63 is in sliding connection with the vertical plate 7 through the first sliding groove 70, and the second limiting block 64 is in sliding connection with the vertical plate 7 through the second sliding groove 71. Before use, the screening basket 6 is assembled with the vertical plate 7, that is, the slide rod 63 on the screening basket 6 and the second limiting block 64 on the slide rod 63 both enter from the opening 72 on the vertical plate 7, until the screening basket 6 cannot continue to move downward in a direction perpendicular to the base 1, at this time, the second limiting block 64 is at the communication position of the opening 72 and the first sliding groove 70, and the slide rod 63 is at the communication position of the opening 72 and the second sliding groove 71, finally, the motor 2 is started, and the motor 2 drives the screening basket 6 to move back and forth along the length direction of the vertical plate 7 through the connection relationship between the motor 2, the rotating disc 3, the second connecting rod 41, the first connecting rod 40 and the connecting column 5. In the movement process of the screening basket 6, the second limiting block 64 moves back and forth on the vertical plate 7 through the second sliding groove 71, and the vertical plate 7 can limit the movement of the screening basket 6.

[0065] In one of the embodiments, as shown in Figure 1 and Figure 6 , the bottom of the vertical plate 7 is also provided with a second limiting groove 73 along the length direction of itself, and the connecting plate 8 is in sliding connection with the vertical plate 7 through the second limiting groove 73.

[0066] In use, the connecting plate 8 is connected with the vertical plate 7 through the second limiting groove 73, which can prevent the displacement of the screening basket 6 in the direction of the central axis of the screening basket 6, i.e. the vertical plate 7 limits the connecting plate 8, thereby limiting the screening basket 6 in the height direction. Specifically, the bottom of the vertical plate 7 is provided with the second limiting groove 73 along the length direction of the vertical plate 7, the groove of the second limiting groove 73 is respectively towards the side wall and the bottom of the vertical plate 7, the second limiting groove 73 is used for sliding the connecting plate 8, so that the connecting plate 8 is connected with the vertical plate 7 through the second limiting groove 73, thereby limiting the screening basket 6 in the height direction, avoiding the upward movement of the screening basket 6 in the height direction during the movement of the connecting column 5.

[0067] In one embodiment, the top of the first screening basket unit 60 is provided with a cover plate (not shown in the figure).

[0068] In use, the cover plate is buckled on the top of the first screening basket unit 60, covering the first screening basket unit 60, which can prevent the dust generated by the collision between the silicon material in the first screening basket unit 60 and the inner wall of the first screening basket unit 60 from diffusing into the air during the screening process, thereby affecting the detection environment.

[0069] Finally, it should be noted that: the above is only the preferred embodiment of the present application, and is not used to limit the present application. For those skilled in the art, the present application can have various changes and variations, and the embodiments of the present application and the features in the embodiments can be combined with each other arbitrarily without conflict. Any modification, equivalent replacement, improvement, etc. within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. An automatic screening device for raw polycrystalline silicon powder for single crystal pulling, characterized in that, The utility model relates to a kind of screening basket and screening device, including: Base, the top of which is provided with motor; Rotating disc, which is provided at the end of the output shaft of the motor, and the rotating disc is coaxially arranged between the output shaft of the motor; Crank mechanism, which is connected with the rotating disc in power; Screening basket, which is connected with the other end of the crank mechanism, and the screening basket can reciprocate in horizontal direction under the driving of the crank mechanism; Wherein, the screening basket is provided with at least two screens with different mesh sizes, and the screen with larger mesh size is located above the screen with smaller mesh size.

2. The automatic screening device for the raw polycrystalline silicon powder for single crystal pulling according to claim 1, characterized in that, The crank mechanism includes a first connecting rod and a second connecting rod, the first connecting rod is eccentrically arranged on the outer wall of the rotating disc, the other end of the first connecting rod is rotatably connected with the second connecting rod, and the other end of the second connecting rod is hingedly connected with the screening basket.

3. The automatic screening device for the raw polycrystalline silicon powder for single crystal pulling according to claim 2, characterized in that, The top of the base is provided with a vertical plate, the side of the vertical plate facing the screening basket is provided with a first sliding groove along the movement direction of the screening basket, the outer wall of the screening basket is provided with a sliding rod, and the sliding rod is slidably connected with the vertical plate through the first sliding groove.

4. The automatic screening device for the raw polycrystalline silicon powder for single crystal pulling according to claim 2, characterized in that, The screening basket includes a first screening basket unit and a second screening basket unit, the screen includes a first screen and a second screen, the first screen is arranged inside the first screening basket unit, the second screen is arranged inside the second screening basket unit, and the bottom of the first screening basket unit is provided with a snap ring, the outer diameter of the snap ring is equal to the inner diameter of the second screening basket unit.

5. The automatic screening device for the raw polycrystalline silicon powder for single crystal pulling according to claim 3, characterized in that, A connecting column is arranged between the second connecting rod and the screening basket, a fixing seat is arranged on the side wall of the connecting column, the second connecting rod is hingedly connected with the fixing seat, the connecting column is provided with a first limiting groove from top to bottom along the height direction of the connecting column, and a first limiting block is arranged on the outer wall of the screening basket.

6. The automatic screening device for the raw polycrystalline silicon powder for single crystal pulling according to claim 5, characterized in that, The top of the base is slidably connected with a connecting plate, the connecting column is vertically arranged on the top of the connecting plate, and there is a gap between the connecting plate and the bottom of the screening basket.

7. The automatic screening device for the raw polycrystalline silicon powder for single crystal pulling according to claim 3, characterized in that, The inside of the vertical plate is provided with a second sliding groove in communication with the first sliding groove, the other end of the sliding rod is provided with a second limiting block, and the second limiting block is slidably connected with the vertical plate through the second sliding groove. Wherein, the outer diameter of the second limiting block is greater than the outer diameter of the sliding rod.

8. The automatic screening device for the raw polycrystalline silicon powder for single crystal pulling according to claim 7, characterized in that, The top of the vertical plate is provided with an opening in communication with the first sliding groove and the second sliding groove, for the sliding rod and the second limiting block to enter.

9. The automatic screening device for the raw polycrystalline silicon powder for single crystal pulling according to claim 6, characterized in that, The bottom of the vertical plate is also provided with a second limiting groove along the length direction of the vertical plate, and the connecting plate is slidably connected with the vertical plate through the second limiting groove.

10. The automatic screening device for the raw polycrystalline silicon powder for single crystal pulling according to claim 4, characterized in that, The top of the first screening basket unit is buckled with a cover plate.

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