Crucible drive shaft, crucible drive assembly, and application method of crucible drive assembly

Abstract

The present invention relates to a crucible transmission shaft for connecting with a crucible to drive the crucible to rotate, including a transmission shaft body. A flange is circumferentially arranged on the outer peripheral surface of the transmission shaft body. In the radial direction of the transmission shaft body, the flange has an outer side surface away from the transmission shaft body, and the orthographic projection of the outer side surface in the axial direction of the transmission shaft body is in the shape of a Fermat curve. The present invention also relates to a crucible transmission assembly and an application method of the crucible transmission assembly. By using the special shape of the Fermat curve and the Fermat curve equation, the angular velocity within a preset time period can be obtained, so as to obtain the rotation speed of the crucible within the preset time period. Compared with the rotation speed obtained after the crucible rotates one week, it is beneficial to the precise control of parameters and beneficial to improving the quality of the ingot.

Description

Technical Field

[0001] The present invention relates to the technical field of silicon product manufacturing, and particularly to a crucible drive shaft, a transmission assembly, and an application method of a crucible transmission assembly. Background Art

[0002] In the traditional technology, when the drive shaft rotates one week, the sensor senses a signal once, and the crucible rotation speed can be calculated. For example, if it takes 2 minutes to rotate one week, the crucible rotation speed is 0.5 rpm / min. In the actual crystal pulling process, it is often necessary to know the real-time rotation speed. For example, after the crucible rotation speed is changed from 0.5 rpm / min to 1.2 rpm / min, it is necessary to know the real-time rotation speed in the interval from 0.5 rpm / min to 1.2 rpm / min, and this parameter is crucial for the quality of crystal pulling. Summary of the Invention

[0003] In order to solve the above technical problems, the present invention provides a crucible drive shaft, a transmission assembly, and an application method of a crucible transmission assembly to solve the problem of being unable to obtain the real-time rotation speed of the crucible.

[0004] In order to achieve the above object, the technical solution adopted in the embodiment of the present invention is: a crucible drive shaft, including a drive shaft body, a flange is circumferentially arranged on the outer peripheral surface of the drive shaft body, in the radial direction of the drive shaft body, the flange has an outer side surface away from the drive shaft body, and the positive projection of the outer side surface in the axial direction of the drive shaft body is in the shape of a Fermat curve.

[0005] Optionally, the positive projection of the starting position of the outer side surface on the drive shaft body coincides with the positive projection of the ending position of the outer side surface on the drive shaft body.

[0006] Optionally, in the axial direction of the drive shaft body, the flange includes two opposite end faces, and at least one of the two end faces is parallel to the radial direction of the drive shaft body.

[0007] Optionally, the flange and the drive shaft body are of an integral structure.

[0008] The embodiment of the present invention also provides a crucible transmission assembly, including:

[0009] The above-mentioned crucible drive shaft, connected to the crucible, for driving the crucible to rotate;

[0010] A ranging unit, for obtaining the distance b between the preset position and the outer side surface of the flange;

[0011] An angular velocity acquisition unit for obtaining the angular velocity value ω of the rotation of the transmission shaft body within a preset time period t. The angular velocity acquisition unit includes a polar angle acquisition part and an angular velocity acquisition part. The preset time period t is the time difference between the starting moment and the ending moment;

[0012] The polar angle acquisition part is used for obtaining the polar angle α corresponding to the starting moment and the polar angle α' corresponding to the ending moment according to the distance b obtained by the distance measurement unit and the Fermat curve equation;

[0013] The angular velocity acquisition part is used for obtaining the angular velocity ω according to the following formula

[0014] ω = Δα / t;

[0015] Δα = |α - α'|;

[0016] wherein, the Fermat curve equation is R = k * α^0.5 * cosα, and R = a - b;

[0017] R is the distance between the outer side surface and the axial center line of the transmission shaft body in the radial direction of the transmission shaft body, and a is the distance between the preset position and the axial center line of the transmission shaft body.

[0018] Optionally, the distance measurement unit includes a distance measurement sensor, and the preset position is the position where the distance measurement sensor is located.

[0019] Optionally, the distance measurement unit is used for obtaining the distance b' between the outer side surface and the preset position corresponding to the first moment within a preset time period and the distance b'' between the outer side surface and the preset position corresponding to the second moment;

[0020] The crucible transmission assembly further includes a rotation direction judgment unit for judging that the transmission shaft body rotates along a first direction when b' is greater than b'', and judging that the transmission shaft body rotates along a second direction opposite to the first direction when b' is less than b''.

[0021] Optionally, the rotation direction judgment unit and the angular velocity acquisition unit are integrally arranged.

[0022] An embodiment of the present invention further provides a method for obtaining the angular velocity of the rotation of the crucible, which is obtained by the above-mentioned crucible transmission assembly, and includes the following steps:

[0023] Place the distance measurement sensor on one side in the radial direction of the transmission shaft body;

[0024] Measure the distance b between the outer side surface and the distance measurement sensor through the distance measurement sensor;

[0025] According to the distance a between the preset position and the axial center line of the transmission shaft body, the distance b, and the Fermat curve equation, obtain the polar angle α corresponding to the starting moment of the preset time period t and the polar angle α′ corresponding to the ending moment of the preset time period t, where the Fermat curve equation is: R = k * α^0.5 * cosα = a - b, and R is the distance between the outer side surface and the axial center line of the transmission shaft body in the radial direction of the transmission shaft body;

[0026] Obtain the angular velocity value ω of the rotation of the transmission shaft body within the preset time period t according to the polar angle α and the polar angle α′, where ω = Δα / t; Δα = |α - α′|.

[0027] An embodiment of the present invention further provides a method for judging the rotation direction of the crucible, which is obtained through the above-mentioned crucible transmission assembly.

[0028] It includes the following steps:

[0029] Place the ranging sensor on one side in the radial direction of the transmission shaft body;

[0030] Obtain the distance b′ between the outer side surface and the preset position corresponding to the first moment within the preset time period and the distance b″ between the outer side surface and the preset position corresponding to the second moment;

[0031] When b′ is greater than b″, judge that the transmission shaft body rotates along the first direction, and when b′ is less than b″, judge that the transmission shaft body rotates along the second direction opposite to the first direction.

[0032] The beneficial effects of the present invention are as follows: In the embodiment of the present invention, a flange is provided on the outer peripheral surface of the transmission shaft body. In the radial direction of the transmission shaft body, the flange has an outer side surface away from the transmission shaft body, and the orthographic projection of the outer side surface in the axial direction of the transmission shaft body is in the shape of a Fermat curve. By using the special shape of the Fermat curve and the Fermat curve equation, the angular velocity within the preset time period can be obtained, so as to obtain the rotation speed of the crucible within the preset time period. Compared with the rotation speed obtained after the crucible rotates one week, it is beneficial to the precise control of parameters and beneficial to improving the quality of the ingot. Description of the Drawings

[0033] Figure 1 A schematic diagram showing the crucible transmission shaft in the embodiment of the present invention;

[0034] Figure 2 A schematic diagram showing the principle of obtaining the angular velocity in the embodiment of the present invention. Detailed Embodiment

[0035] To make the objectives, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are some but not all of the embodiments of the present invention. All other embodiments obtained by those of ordinary skill in the art based on the described embodiments of the present invention fall within the scope of protection of the present invention.

[0036] In the description of the present invention, it should be noted that the orientation or positional relationship indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. is based on the orientation or positional relationship shown in the accompanying drawings. It is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the present invention. In addition, the terms "first", "second", "third" are only used for descriptive purposes and cannot be construed as indicating or implying relative importance.

[0037] Reference Figure 1 and Figure 2 As shown in [drawings not provided], the present embodiment provides a crucible drive shaft for connecting with a crucible to drive the crucible to rotate. The crucible drive shaft includes a drive shaft body 1, and a flange 2 is circumferentially provided on the outer peripheral surface of the drive shaft body 1. In the radial direction of the drive shaft body 1, the flange 2 has an outer side surface 21 away from the drive shaft body 1, and the orthographic projection of the outer side surface 21 in the axial direction of the drive shaft body 1 is in the shape of a Fermat curve.

[0038] By providing the flange 2 on the outer peripheral surface of the drive shaft body 1, in the radial direction of the drive shaft body 1, the flange 2 has an outer side surface 21 away from the drive shaft body 1, and the orthographic projection of the outer side surface 21 in the axial direction of the drive shaft body 1 is in the shape of a Fermat curve. Using the special shape of the Fermat curve and the Fermat curve equation, the angular velocity within a preset time period can be obtained, and thus the rotation speed of the crucible within the preset time period can be obtained. Compared with the rotation speed obtained after the crucible rotates one week, it is beneficial to the precise control of parameters and beneficial to improving the quality of the ingot.

[0039] In the traditional technology, when the transmission shaft rotates one week, the sensor 3 senses a signal once, and the rotation speed of the crucible rotating one week can be calculated. For example, if it takes 2 minutes to rotate one week, the rotation speed of the crucible is 0.5 rpm / min. In the actual crystal pulling process, it is often necessary to know the real-time (it should be noted that by shortening the duration of the preset time period, the obtained rotation speed is equivalent to the real-time rotation speed) rotation speed. For example, when the rotation speed of the crucible is changed from 0.5 rpm / min to 1.2 rpm / min, it is necessary to know the real-time rotation speed in the interval from 0.5 rpm / min to 1.2 rpm / min. This parameter is crucial for the quality of crystal pulling. And through the crucible transmission shaft of this embodiment, the rotation speed of the crucible can be obtained without rotating one week, and the rotation speed can be obtained at any time period within one week of rotation.

[0040] The rotation speed of the crucible is a very important process parameter, and its magnitude determines the uniformity of oxygen in the crystal bar and the defect distribution in the longitudinal direction of the crystal bar. During the crystal pulling process, it is necessary to adjust the rotation speed of the crucible in real time according to the real-time situation in the crystal pulling furnace. Therefore, real-time crucible rotation speed is required. Through the transmission shaft provided in this embodiment, real-time monitoring and recording of the crucible rotation speed can be realized, which is beneficial to adjusting other process parameters in time according to the real-time results, beneficial to the precise control of parameters, and beneficial to improving the quality of the crystal bar.

[0041] In an exemplary embodiment, the orthographic projection of the starting position of the outer side surface 21 on the transmission shaft body 1 coincides with the orthographic projection of the ending position of the outer side surface 21 on the transmission shaft body 1.

[0042] In this embodiment, the orthographic projection of the outer side surface 21 of the flange 2 in the axial direction of the transmission shaft body 1 is in the shape of a Fermat curve. The polar angle at any position in the extending direction of the Fermat curve is obtained according to the Fermat curve equation, so that the rotation angle within a certain time period can be obtained, and then the angular velocity within this time period can be obtained, that is, the angular velocity of the crucible rotation is obtained. In order to obtain the angular velocity of the transmission shaft body 1 within the rotation angle of θ (θ is less than or equal to 360 degrees, such as 30 degrees, 50 degrees, 100 degrees, etc.), the orthographic projection of the starting position of the outer side surface 21 on the transmission shaft body 1 coincides with the orthographic projection of the ending position of the outer side surface 21 on the transmission shaft body 1, so that the orthographic projection of the outer side surface 21 covering the outer peripheral surface of the transmission shaft in the axial direction of the transmission shaft body 1 is in the shape of a Fermat curve.

[0043] In an exemplary embodiment, in the axial direction of the transmission shaft body 1, the flange 2 includes two end faces arranged oppositely, and at least one of the two end faces is parallel to the radial direction of the transmission shaft body. Ensure that two different positions on the outer side surface 21 are on the rotation plane of the transmission shaft body 1 and conform to the Fermat curve law, so as to improve the accuracy of the angular velocity.

[0044] In an exemplary embodiment, the flange 2 and the transmission shaft body 1 are of an integral structure.

[0045] The flange 2 and the transmission shaft body 1 may be of a split structure and are connected by an adhesive layer or bolts, etc. In this embodiment, the flange 2 and the transmission shaft body 1 are integrally formed, which simplifies the structure and ensures that there is no relative position offset between the flange 2 and the transmission shaft body 1. Therefore, preferably, the flange 2 and the transmission shaft body 1 are of an integral structure.

[0046] Reference Figure 1 and Figure 2 , the embodiment of the present invention further provides a crucible transmission assembly, including:

[0047] The above-mentioned crucible transmission shaft, which is in transmission connection with the crucible and is used to drive the crucible to rotate;

[0048] A ranging unit, which is used to obtain the distance b between the preset position and the outer side surface 21 of the flange 2 (reference Figure 2 the distance between AB in

[0049] An angular velocity acquisition unit, which is used to obtain the angular velocity value ω of the rotation of the transmission shaft body 1 within a preset time period t, and includes a polar angle acquisition part and an angular velocity acquisition part. The preset time period t has a start time and an end time;

[0050] The polar angle acquisition part is used to obtain the polar angle α corresponding to the start time and the polar angle α' corresponding to the end time according to the distance b obtained by the ranging unit and the Fermat curve equation;

[0051] The angular velocity acquisition part is used to obtain the angular velocity ω according to the following formula

[0052] ω = Δα / t;

[0053] Δα = |α - α'|;

[0054] wherein, the Fermat curve equation is R = k * α^0.5 * cosα, R = a - b;

[0055] R is the distance between the outer side surface 21 and the axial center line of the transmission shaft body 1 in the radial direction of the transmission shaft body 1 (reference Figure 2 the distance between OA in Figure 2 the distance between OB in

[0056] Exemplarily, the ranging unit includes a ranging sensor 3, and the preset position is the position where the ranging sensor 3 is located.

[0057] In this embodiment, the distance b between the preset position and the outer side surface 21 of the flange 2 is obtained by the distance measuring unit. Here, the preset position is the position where the distance measuring sensor 3 is located. The light emitted by the distance measuring sensor 3 is reflected by the outer side surface 21 of the flange 2 and then received by the distance measuring sensor 3 again, so as to obtain the distance between the distance measuring sensor 3 and the outer side surface 21. The distance between the axis line of the transmission shaft body 1 and the distance measuring sensor 3 can also be obtained by measurement, that is, the distance a between the axis line of the transmission shaft body 1 and the preset position is known. Thus, the distance between the outer side surface 21 and the axis line of the transmission shaft body 1 can be obtained according to R = a - b. During the rotation of the transmission shaft, the distance measuring sensor 3 can continuously obtain the distance b between the preset position and the outer side surface 21 of the flange 2, that is, the distance between a point on the outer side surface 21 and the axial center line of the transmission shaft body 1 can be continuously obtained (the position of the distance measuring sensor 3 is fixed. As the transmission shaft body 1 rotates, the point on the outer side surface 21 measured by the distance measuring sensor 3 will change, and the positive projection of the outer side surface 21 in the axial direction of the transmission shaft body 1 is in the shape of a Fermat curve. Along the extension direction of the Fermat curve, the distances from different points on the Fermat curve to the axial center line of the transmission shaft body 1 are different). Using the Fermat curve equation, the polar angles at the starting position and the ending position of the preset time period can be obtained, and then the rotation angle of the preset time period can be obtained, and further the angular velocity within the preset time period can be obtained.

[0058] It should be noted that in the Fermat curve equation, R = k * α^0.5 * cosα, where k is a coefficient, and the selection of k can be determined according to actual needs. The value of k determines the shape of the Fermat curve. For example, the value of k is 30, but it is not limited thereto.

[0059] In an exemplary embodiment, the distance measuring unit is used to obtain the distance b' between the outer side surface 21 and the preset position corresponding to the first moment and the distance b'' between the outer side surface 21 and the preset position corresponding to the second moment within a preset time period;

[0060] The crucible transmission assembly further includes a rotation direction judging unit, which is used to judge that the transmission shaft body 1 rotates along the first direction when b' is greater than b'', and judge that the transmission shaft body 1 rotates along the second direction opposite to the first direction when b' is less than b''.

[0061] The positive projection of the outer side surface 21 in the axial direction of the transmission shaft body 1 is in the shape of a Fermat curve, that is, the thickness of the flange 2 in the radial direction of the transmission shaft body 1 gradually increases along the extension direction of the Fermat curve. With the position of the distance measuring sensor 3 remaining unchanged, as the transmission shaft rotates, the distance measured by the distance measuring sensor 3 between the distance measuring sensor 3 and the outer side surface 21 gradually increases or decreases. Therefore, as long as any two time points are selected for measurement and the corresponding distances b' and b'' at the respective times are compared, the rotation direction of the transmission shaft can be determined.

[0062] In an exemplary embodiment, the rotation direction determination unit and the angular velocity acquisition unit are integrally provided.

[0063] The rotation direction determination unit and the angular velocity acquisition unit can be separately provided or integrally provided. In this embodiment, preferably, the rotation direction determination unit and the angular velocity acquisition unit are integrally provided, for example, integrally provided in a PLC (Programmable Logic Controller), but not limited thereto.

[0064] Reference Figure 2 , the embodiment of the present invention further provides a method for obtaining the angular velocity of the crucible rotation, obtained through the above-mentioned crucible transmission assembly, including the following steps:

[0065] Place the distance measuring sensor 3 on one side in the radial direction of the transmission shaft body 1, and ensure that the distance measuring sensor 3 is located in the measurement plane;

[0066] Measure the distance b between the outer side surface 21 and the distance measuring sensor 3 through the distance measuring sensor 3;

[0067] According to the distance a between the preset position and the axial center line of the transmission shaft body 1, the distance b, and the Fermat curve equation, obtain the polar angle α corresponding to the starting moment of the preset time period t and the polar angle α' corresponding to the ending moment of the preset time period t. Among them, the Fermat curve equation: R = k * α^0.5 * cosα = a - b, where R is the distance between the outer side surface 21 and the axial center line of the transmission shaft body 1 in the radial direction of the transmission shaft body 1;

[0068] Obtain the angular velocity value ω of the rotation of the transmission shaft body 1 within the preset time period t according to the polar angle α and the polar angle α', where ω = Δα / t; Δα = |α - α'|.

[0069] Specifically, in a radial plane parallel to the radial direction of the transmission shaft body 1, an xy coordinate system is established with the point o where the radial plane coincides with the axial center line of the transmission shaft body 1 as the origin. The distance measuring sensor 3 is located on the x-axis, and the distance between the distance measuring sensor 3 and the axial center line of the transmission shaft body 1 is a, and the distance between the distance measuring sensor 3 and the outer side surface 21 is b (the value of b changes as the transmission shaft rotates).

[0070] According to the Fermat curve equation R = k * α^0.5 * cosα (k is a coefficient), the polar angle α corresponding to the starting moment of the preset time period t (the angle of rotation of the transmission shaft within the preset time period t is less than or equal to 360 degrees) and the polar angle α' corresponding to the ending moment of the preset time period t are obtained, where R = a - b (the values of b corresponding to the starting moment and b' corresponding to the ending moment can be measured by the distance measuring sensor 3).

[0071] According to the polar angle α and the polar angle α', the angular velocity value ω of the transmission shaft body 1 rotating within the preset time period t is obtained, where ω = Δα / t; Δα = |α - α'|.

[0072] During the material melting stage in the crystal pulling process, since the deflector component rises to a certain height, the rotation direction of the crucible can be observed in real time. However, when entering the equal-diameter stage of the body, the deflector descends, and it will be impossible to directly observe the rotation direction of the crucible.

[0073] Reference Figure 2 , in view of the above problems, the embodiment of the present invention further provides a method for judging the rotation direction of the crucible, which is obtained through the above-mentioned crucible transmission assembly.

[0074] It includes the following steps:

[0075] Place the distance measuring sensor 3 on one side of the radial direction of the transmission shaft body 1 and make the distance measuring sensor 3 located in the measurement plane.

[0076] Obtain the distance b' between the outer side surface 21 and the preset position corresponding to the first moment within the preset time period and the distance b'' between the outer side surface 21 and the preset position corresponding to the second moment.

[0077] When b' is greater than b'', it is judged that the transmission shaft body 1 rotates along the first direction. When b' is less than b'', it is judged that the transmission shaft body 1 rotates along the second direction opposite to the first direction.

[0078] Specifically, in a radial plane parallel to the radial direction of the transmission shaft body 1, an xy coordinate system is established with the point o where the radial plane coincides with the axial center line of the transmission shaft body 1 as the origin. The distance measuring sensor 3 is located on the x-axis. The distance between the distance measuring sensor 3 and the axial center line of the transmission shaft body 1 is a, and the distance between the distance measuring sensor 3 and the outer side surface 21 is b.

[0079] According to the properties of the Fermat curve, it can be known that as the transmission shaft rotates, the value of b changes. Therefore, during the rotation of the transmission shaft, by measuring the distance between the outer side surface 21 and the distance measuring sensor 3 with the distance measuring sensor 3 and obtaining at least two values, the rotation direction of the transmission shaft can be judged according to the magnitudes of these two values. For example, at the first moment, the value b' is obtained, and at the second moment, the value b'' is obtained. When b' is greater than b'', as the transmission shaft rotates, the value of b gradually becomes smaller, then it is judged that the transmission shaft body 1 rotates along the first direction. When b' is less than b'', as the transmission shaft rotates, the value of b gradually increases, and it is judged that the transmission shaft body 1 rotates along the second direction opposite to the first direction. Assuming that the Fermat curve extends in the counterclockwise direction, then the first direction is the counterclockwise direction, and the second direction is the clockwise direction.

[0080] In an embodiment, after the distance measuring sensor 3 obtains the b values corresponding to different moments, the R values corresponding to different moments are obtained through the formula R = a - b, and the rotation direction of the transmission shaft (i.e., the transmission direction of the crucible connected to the transmission shaft) is judged according to the change trend of the R values. At this time, as the transmission shaft rotates, if the R value gradually becomes larger, then the rotation direction of the transmission shaft is opposite to the extension direction of the Fermat curve. Assuming that the extension direction of the Fermat curve is the counterclockwise direction, then at this time the transmission shaft rotates clockwise. If the R value gradually becomes smaller, then the transmission shaft rotates counterclockwise.

[0081] It can be understood that the above embodiments are merely exemplary embodiments adopted to illustrate the principle of the present invention. However, the present invention is not limited thereto. For those of ordinary skill in the art, various modifications and improvements can be made without departing from the spirit and essence of the present invention, and these modifications and improvements are also regarded as the protection scope of the present invention.

Claims

1. A crucible drive assembly, characterized in that, it includes: A crucible drive shaft, connected to the crucible and used to drive the crucible to rotate. The crucible drive shaft includes a drive shaft body. A flange is circumferentially arranged on the outer peripheral surface of the drive shaft body. In the radial direction of the drive shaft body, the flange has an outer side surface away from the drive shaft body. The positive projection of the outer side surface in the axial direction of the drive shaft body is in the shape of a Fermat curve; A ranging unit, used to obtain the distance b between a preset position and the outer side surface of the flange; An angular velocity acquisition unit, used to obtain the angular velocity value ω of the rotation of the drive shaft body within a preset time period t. The angular velocity acquisition unit includes a polar angle acquisition part and an angular velocity acquisition part. The preset time period t is the time difference between the starting moment and the ending moment; The polar angle acquisition part is used to obtain the polar angle α corresponding to the starting moment and the polar angle α' corresponding to the ending moment according to the distance b obtained by the ranging unit and the Fermat curve equation; The angular velocity acquisition part is used to obtain the angular velocity ω according to the following formula, ω = Δα / t; Δα = |α - α'|; wherein, the Fermat curve equation is R = k * α^0.5 * cosα, R = a - b; K is a coefficient, R is the distance between the outer side surface and the axial center line of the drive shaft body in the radial direction of the drive shaft body, and a is the distance between the preset position and the axial center line of the drive shaft body; The ranging unit includes a ranging sensor, and the preset position is the position where the ranging sensor is located.

2. The crucible drive assembly according to claim 1, characterized in that, The positive projection of the starting position of the outer side surface on the drive shaft body coincides with the positive projection of the ending position of the outer side surface on the drive shaft body.

3. The crucible drive assembly according to claim 1, characterized in that, In the axial direction of the drive shaft body, the flange includes two opposite end faces, and at least one of the two end faces is parallel to the radial direction of the drive shaft body.

4. The crucible drive assembly according to claim 1, characterized in that, The flange and the drive shaft body are of an integral structure.

5. The crucible drive assembly according to claim 1, characterized in that, The ranging unit is used to obtain the distance b' between the outer side surface and the preset position corresponding to the first moment within a preset time period and the distance b'' between the outer side surface and the preset position corresponding to the second moment; The crucible drive assembly further includes a rotation direction judgment unit, used to judge that the drive shaft body rotates along a first direction when b' is greater than b'', and judge that the drive shaft body rotates along a second direction opposite to the first direction when b' is less than b''.

6. The crucible drive assembly according to claim 5, characterized in that, The rotation direction judgment unit and the angular velocity acquisition unit are integrally arranged.

7. An application method of a crucible drive assembly, applied to the crucible drive assembly according to any one of claims 1-6, characterized in that, it includes the following steps: Place the ranging sensor on one side in the radial direction of the transmission shaft body; Measure the distance b between the outer side surface and the ranging sensor through the ranging sensor; Obtain the polar angle α corresponding to the starting moment of the preset time period t and the polar angle α' corresponding to the ending moment of the preset time period t according to the distance a between the preset position and the axial center line of the transmission shaft body, the distance b, and the Fermat curve equation, where the Fermat curve equation is: R = k * α^0.5 * cosα = a - b, and R is the distance between the outer side surface and the axial center line of the transmission shaft body in the radial direction of the transmission shaft body; Obtain the angular velocity value ω of the transmission shaft body rotating within the preset time period t according to the polar angle α and the polar angle α', where ω = Δα / t; Δα = |α - α'|.

8. An application method of a crucible transmission assembly, applied to judge the crucible transmission assembly according to any one of claims 1-6 ， Characterized in that, It includes the following steps: Place the ranging sensor on one side in the radial direction of the transmission shaft body; Obtain the distance b' between the outer side surface and the preset position corresponding to the first moment and the distance b'' between the outer side surface and the preset position corresponding to the second moment within the preset time period; When b' is greater than b'', judge that the transmission shaft body rotates along the first direction, and when b' is less than b'', judge that the transmission shaft body rotates along the second direction opposite to the first direction.

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