Tungsten wire rope sway crystal testing system and method

Abstract

The invention discloses a tungsten wire rope crystal swaying test system and method thereof, comprising a crystal growth simulation mechanism and a measurement feedback mechanism; the crystal growth simulation mechanism is used for simulating the suspension rotation mode of the tungsten wire rope and the weight during the growth of single crystal silicon; the measurement feedback mechanism comprises an acquisition module, a measurement module and a display module, the acquisition module is used for acquiring images of the tungsten wire rope and the weight during the rotation process, and amplifying the images and displaying them through the display module; the measurement module is used for measuring the axial center offset of the weight during rotation, and displaying the axial center offset through the display module. The device fills the gaps in the detection items and methods of the straightness and verticality of the tungsten wire rope when in use, can timely detect unqualified weights with offset center of gravity, detect the straightness and verticality of the tungsten wire rope, and detect the axial center matching degree of the weight and the tungsten wire rope, thereby avoiding the problems of crystal swaying and crystal induction deviation caused by the difference in straightness and verticality of the tungsten wire rope during the crystal growth process in the photovoltaic industry, and improving the quality of single crystal silicon rods.

Description

Technical Field

[0001] The present invention relates to the technical field of photovoltaic equipment, and in particular to a tungsten wire rope swaying crystal testing system and method thereof. Background Art

[0002] With the rapid development of the solar photovoltaic industry, the growth and weight of single crystal silicon rods in the current photovoltaic industry by the Czochralski method have caused the problems of crystal shaking and crystal bias during the growth of single crystal silicon to become increasingly serious, seriously affecting the quality of crystal growth, and has become a technical bottleneck in the industry. Among them, the straightness and verticality performance of the tungsten wire rope products used to pull the single crystal silicon rods during the growth of single crystal silicon have become one of the main factors affecting crystal shaking. When the tungsten wire rope products are used in the single crystal silicon growth furnace, the upper end is fastened to the rope motor and then naturally falls down and is connected to the matching weight. The tungsten wire rope and the weight are observed by human eyes to see whether they are vertical. If they are not vertical, the pulling system of the single crystal growth furnace is fine-tuned. It is guaranteed by the adjustment of the single crystal furnace equipment itself, and there is no detection facility for the straightness and linearity of the tungsten wire rope products themselves. Therefore, there is no data and technical indicators to judge the tungsten wire rope, which is one of the important factors in the crystal rod shaking phenomenon, resulting in incomplete and inaccurate analysis of the crystal shaking phenomenon. In the practice of producing single crystals by the Czochralski method, the crystal shaking phenomenon occurs, referred to as crystal shaking. Its essence is a form of movement after the growth system is disturbed by some interference. The shaking will cause the change of the microscopic diffusion layer at the moment of growth, resulting in the change of the effective segregation coefficient, leading to the radial inhomogeneity of the microscopic dopant concentration distribution. It will cause the instability of solution convection, the change of the supercooling degree of the solid-liquid interface, and the growth of dendrites. This will greatly affect the stability of crystal growth, single crystal shape, resistivity and micro defects. Summary of the invention

[0003] In view of the above-mentioned defects or shortcomings, the object of the present invention is to provide a tungsten wire rope sway crystal testing system and method, which can measure the straightness and verticality performance of the tungsten wire rope itself when in use.

[0004] To achieve the above purpose, the technical solution of the present invention is:

[0005] A tungsten wire rope crystal shaking test system includes a crystal growth simulation mechanism and a measurement feedback mechanism; wherein the crystal growth simulation mechanism is used to simulate the suspension rotation mode of the tungsten wire rope and the weight during the growth of single crystal silicon; the measurement feedback mechanism includes an acquisition module, a measurement module and a display module, wherein the acquisition module is used to obtain images of the tungsten wire rope and the weight during rotation, and amplify the images and display them through the display module; the measurement module is used to measure the axial center offset of the weight during rotation, and display the axial center offset through the display module.

[0006] The crystal growth simulation mechanism comprises a motor arranged at a high position, a tungsten wire rope is hung on the motor, and a heavy hammer is matched and installed on the tungsten wire rope.

[0007] The acquisition module includes a camera, and the camera is used to capture the images of the tungsten wire rope and the weight rotating after the motor rotates.

[0008] The camera is a CCD high-frequency capture camera.

[0009] The measuring module includes a displacement sensor, which is used to measure the axial deviation of the rotating tungsten wire rope and the weight, and to generate a curve after recording, so as to record the shaking amount and deviation of the tungsten wire rope to feedback its straightness and verticality performance.

[0010] The displacement sensor is an infrared displacement sensor.

[0011] A tungsten wire rope sway crystal testing method, comprising:

[0012] 1) After the crystal growth simulation mechanism is set up, the distance of the stationary weight is measured by the measuring module, and the distance measurement is reset to zero;

[0013] 2) Start the crystal growth simulation mechanism to make the tungsten wire rope and the weight rotate at a uniform speed, and obtain the image of the tungsten wire rope and the weight during the rotation process through the acquisition module, and enlarge the image and display it through the display module; the measurement module measures the axis deviation of the rotating weight;

[0014] 3) Record the measured axis offset in real time, and generate a curve of the axis offset of the weight to record the shaking and offset of the tungsten wire rope system to provide feedback on its straightness and verticality performance.

[0015] The acquisition module, measurement module and display module are all installed on the console.

[0016] The average rotation speed of the tungsten wire rope and the weight is 3n / min to 20n / min.

[0017] Compared with the prior art, the beneficial effects of the present invention are:

[0018] The present invention provides a tungsten wire rope crystal swaying test system and method, which are composed of a crystal growth simulation mechanism and a measurement feedback mechanism. The crystal growth simulation mechanism simulates the suspension rotation mode of the tungsten wire rope and the weight in the process of single crystal silicon growth, and then the eccentricity of the tungsten wire rope and the weight in the rotating state is obtained through the acquisition module, the measurement module and the display module. The device fills the detection items and methods of the straightness and verticality of the tungsten wire rope in use, can timely detect unqualified weights with offset center of gravity, detect the straightness and verticality of the tungsten wire rope, and detect the axial matching degree of the weight and the tungsten wire rope, thereby avoiding the problems of crystal swaying and crystal induction deviation caused by the difference in straightness and verticality of the tungsten wire rope in the process of crystal growth in the photovoltaic industry, and improving the quality of single crystal silicon rods. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a schematic diagram of the structure of the tungsten wire rope dangling crystal testing system of the present invention. DETAILED DESCRIPTION

[0020] The present invention will be described in detail below in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the protection scope of the present invention.

[0021] During the growth of single crystal silicon, problems such as crystal shaking and crystal seeding deviation occurred, but it is impossible to determine whether the cause of the problem is related to the straightness and verticality of the tungsten wire rope itself. In order to solve this problem, Figure 1 As shown, the present invention provides a tungsten wire rope crystal shaking test system, including a crystal growth simulation mechanism and a measurement feedback mechanism; wherein, the crystal growth simulation mechanism is used to simulate the suspension rotation mode of the tungsten wire rope and the weight during the growth process of single crystal silicon; the measurement feedback mechanism includes an acquisition module, a measurement module and a display module, wherein the acquisition module is used to obtain the image of the tungsten wire rope and the weight during the rotation process, and amplify the image and display it through the display module; the measurement module is used to measure the axial offset of the weight during rotation, and display the axial offset through the display module.

[0022] Specifically, in the present invention, the crystal growth simulation mechanism includes a motor 1 arranged at a high place, a tungsten wire rope 2 is suspended on the motor 1, and a weight 3 is installed on the tungsten wire rope 2. A control module is connected to the motor 1, which is used to control the start and stop of the console, the rotation direction and the rotation speed. Preferably, the length of the tungsten wire rope is 8 meters. A display module is arranged on the console.

[0023] The acquisition module in the present invention includes a camera 4, which is used to capture the image of the rotation of the tungsten wire rope 2 and the weight 3 after the motor 1 rotates. Preferably, the camera 4 is a CCD high-frequency capture camera. The camera 4 captures the image of the rotating object through the display module to enlarge the image, and the rotation angular velocity and shaking can be observed more intuitively. The observation of the rotation effect in the actual crystal growth process is also displayed by the camera outside the furnace. The observation method in the present invention is consistent with the observation method in the actual crystal growth.

[0024] The measuring module includes a displacement sensor 5, which is used to measure the axis deviation of the rotating tungsten wire rope and the weight, and to generate a curve after recording, which is used to record the shaking amount and deviation of the tungsten wire rope to feedback its straightness and verticality performance. The displacement sensor 5 is an infrared displacement sensor. After the infrared displacement sensor is fixed in position, the infrared light hits the surface of the stationary weight vertically and resets the distance measurement to zero. After the crystal growth simulation system is started, it is used to measure the axis deviation (i.e., shaking amount) of the rotating tungsten wire rope and the weight, and can accurately and real-time measure the shaking amount of the weight during the rotation process. The console is connected to the infrared displacement sensor circuit, and the measurement signal and data are digitally displayed on the console. The whole process is recorded and a curve is generated to record the shaking amount and deviation of the tungsten wire rope system to feedback its straightness and verticality performance. The infrared laser of the infrared displacement sensor is generally hit at the maximum diameter of the weight to measure the axis deviation, and the laser irradiation direction intersects perpendicularly with the axis line of the stationary weight. The camera must capture the red laser ranging point on the weight and part of the tungsten wire rope to clearly show the rotation of the weight.

[0025] The present invention also includes a tungsten wire rope swaying crystal testing method, comprising:

[0026] 1) After the crystal growth simulation mechanism is set up, the distance of the stationary weight is measured by the measuring module, and the distance measurement is reset to zero;

[0027] 2) Start the crystal growth simulation mechanism to make the tungsten wire rope and the weight rotate at a uniform speed, and obtain the image of the tungsten wire rope and the weight during the rotation process through the acquisition module, and enlarge the image and display it through the display module; the measurement module measures the axis deviation of the rotating weight;

[0028] 3) Record the measured axis offset in real time, and generate a curve of the axis offset of the weight to record the shaking and offset of the tungsten wire rope system to provide feedback on its straightness and verticality performance.

[0029] The acquisition module, the measuring module and the display module are all installed on the console; the average rotation speed of the tungsten wire rope and the weight is 3n / min to 20n / min.

[0030] Experimental results of the present invention show that:

[0031] Using the tungsten wire rope crystal shaking test system of the present invention, taking the Φ4.0 tungsten wire rope product as an example, an 8KG heavy hammer is used, the net hanging height is 8 meters, the motor is set to rotate counterclockwise, the speed is 7n / min, and after sampling and testing 50 tungsten wire ropes, it is found that the maximum axial deviation of the tungsten wire rope hanging hammer is 1.38mm, which has exceeded the standard requirement of 1mm crystal rod shaking in the single crystal industry. After a lot of process improvements, 50 new Φ4.0 tungsten wire ropes are sampled and tested. After the control variable test, it is found that the maximum axial deviation of the tungsten wire rope hanging hammer is 0.47mm.

[0032] The detection method of the present invention can completely solve the problem of crystal sway and crystal seeding deviation caused by tungsten wire rope problems during crystal growth, greatly reducing the occurrence of crystal sway and crystal seeding deviation, greatly reducing the risk of crystal sway accidents for Czochralski single crystal silicon production enterprises, and effectively ensuring the production quality of single crystal silicon rods. It lays the technical guarantee conditions and foundation for the development of larger size and heavier single crystal silicon rods in the single crystal production industry, and effectively promotes the development of higher production capacity and higher quality in the single crystal industry.

[0033] It is obvious to those skilled in the art that the above-mentioned specific examples are only preferred embodiments of the present invention. Therefore, the improvements and changes that may be made by those skilled in the art to certain parts of the present invention still embody the principles of the present invention and achieve the purpose of the present invention, and all belong to the scope of protection of the present invention.

Claims

1. A tungsten wire rope sway crystal testing system, characterized in that: The invention comprises a crystal growth simulation mechanism and a measurement feedback mechanism; wherein the crystal growth simulation mechanism is used to simulate the suspension rotation mode of a tungsten wire rope and a weight during the growth of single crystal silicon; the measurement feedback mechanism comprises a collection module, a measurement module and a display module, wherein the collection module is used to obtain images of the tungsten wire rope and the weight during the rotation process, and to amplify the images and display them through the display module; the measurement module is used to measure the axis deviation of the weight during the rotation, and to display the axis deviation through the display module; the crystal growth simulation mechanism comprises a motor (1) arranged at a high position, a tungsten wire rope (2) is suspended on the motor (1), and a weight (3) is mounted on the tungsten wire rope (2); the collection module comprises a camera (4), and the camera (4) is used to take pictures. After the motor (1) rotates, the tungsten wire rope (2) and the weight (3) rotate. The camera (4) is a CCD high-frequency capture camera. The measurement module includes a displacement sensor (5), which is used to measure the axis deviation of the tungsten wire rope and the weight (3) during rotation, and to generate a curve after recording, which is used to record the shaking amount and deviation of the tungsten wire rope (2) and feedback its straightness and verticality performance. The infrared laser of the displacement sensor (5) is projected at the maximum diameter of the weight (3) to measure the axis deviation, and the laser irradiation direction is perpendicular to the axis center line of the stationary weight (3). The camera (4) shoots the red laser distance measurement point on the weight (3), and shoots part of the tungsten wire rope (2), showing the rotation of the weight.

2. The tungsten wire rope sway crystal testing system according to claim 1, characterized in that: The displacement sensor (5) is an infrared displacement sensor.

3. A testing method for a tungsten wire rope sway crystal testing system based on any one of claims 1-2, characterized in that: include: 1) After the crystal growth simulation mechanism is set up, the distance of the stationary weight is measured by the measuring module, and the distance measurement is reset to zero; 2) Start the crystal growth simulation mechanism to make the tungsten wire rope and the weight rotate at a uniform speed, and obtain the image of the tungsten wire rope and the weight during the rotation process through the acquisition module, and enlarge the image and display it through the display module; the measurement module measures the axis deviation of the rotating weight; 3) Record the measured axis offset in real time, and generate a curve of the axis offset of the weight to record the shaking and offset of the tungsten wire rope system to provide feedback on its straightness and verticality performance.

4. The testing method based on the tungsten wire rope swaying crystal testing system according to claim 3 is characterized in that: The acquisition module, measurement module and display module are all installed on the console.

5. The testing method based on the tungsten wire rope sway crystal testing system according to claim 3 is characterized in that: The average rotation speed of the tungsten wire rope and the weight is 3n / min to 20n / min.

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