Large-size single crystal cutting device and use method thereof

Abstract

The present invention provides a large-size single crystal cutting device and a method for using the same, including: a reversing system and a detection system, characterized in that: the reversing system is arranged on the cutting device to adjust the tension and line speed of the steel wire; the detection system is arranged on the reversing system to detect the tension of the steel wire. The beneficial effect of the present invention is to effectively solve the problem that the two tension arms for controlling the tension of the device are at the wire-releasing end and the wire-receiving end of the device, but the tension of the middle wire net cannot be guaranteed, and the current increase in the diameter and length of the single crystal leads to an increase in the cross-sectional area during the processing, and the tension cannot be evenly distributed at each cutting point, and the current steel wire net reversing device is a driven wheel, which will also lead to the inability to increase the lateral line speed, resulting in the problem that the processing efficiency cannot meet the on-site production needs.

Description

Technical Field

[0001] The invention belongs to the field of photovoltaic technology, and in particular relates to a large-size single crystal cutting device and a use method thereof. Background Art

[0002] At present, as the diameter of single crystals processed in the industry becomes larger, the cutting area in the corresponding squaring process also becomes larger. In order to better improve the processing capacity of large-diameter single crystals, give full play to the processing speed limit of large-diameter equipment, reduce the large-diameter processing cost by increasing equipment output, and gain an advantage in the competition with other competitors in the market.

[0003] When the existing wire cutting integrated machine processes single crystals, under the condition that the steel wire and other auxiliary materials remain unchanged, the change in cutting ability mainly comes from the large tension and wire speed. The greater the tension and wire speed, the stronger the cutting ability, and vice versa.

[0004] At present, the all-in-one machine processing adopts the horizontal cutting method. The two tension arms that control the tension of the equipment are at the wire-releasing end and the wire-receiving end of the equipment, but the tension of the middle wire mesh cannot be guaranteed. In addition, the diameter and length of the single crystal have increased, resulting in a larger cross-sectional area during the processing process. The tension cannot be evenly distributed at each cutting point, and the current steel wire mesh reversing device is a driven wheel, which will also cause the horizontal line speed to be unable to increase, resulting in the processing efficiency being unable to meet on-site production needs. Summary of the invention

[0005] The problem to be solved by the present invention is to provide a large-size single crystal cutting device and a method for using the same, which effectively solves the problem that the two tension arms controlling the tension of the equipment are at the wire-releasing end and the wire-receiving end of the equipment, but the tension of the middle wire mesh cannot be guaranteed. In addition, the diameter and length of the single crystal currently increase, resulting in a larger cross-sectional area during processing, and the tension cannot be evenly distributed at each cutting point. In addition, the current steel wire mesh reversing device is a driven wheel, which can also lead to the inability to increase the lateral line speed, resulting in the problem that the processing efficiency cannot meet the on-site production needs.

[0006] In order to solve the above technical problems, the technical solution adopted by the present invention is: a large-size single crystal cutting device, including: a commutation system and a detection system, characterized in that: a commutation system and a detection system arranged on the commutation system; the commutation system is arranged on the cutting device to adjust the tension and line speed of the steel wire; the detection system is used to detect the tension of the steel wire.

[0007] Preferably, the reversing system comprises an active rotating shaft for adjusting the linear speed and tension of the steel wire, which is arranged on the cutting device.

[0008] More preferably, the active rotating shaft is arranged at a middle position of the cutting device to adjust the tension in the middle of the steel wire and the linear speed of the entire steel wire.

[0009] Preferably, the reversing system further comprises a lifter for adjusting the height of the active rotating shaft, which is arranged on the active rotating shaft.

[0010] Preferably, the detection system comprises a tension sensor for detecting the tension of the steel wire, which is arranged on the reversing system.

[0011] A method for using a large-size single crystal cutting device, characterized in that: a single crystal is placed in the cutting device, and a guide wheel drives the steel wire to cut the single crystal;

[0012] Adjusting the rotation speed of the reversing system to coordinate with the rotation speed of the take-up shaft and the pay-off shaft to control the linear speed of the steel wire;

[0013] The detection system is used to detect the tension in the middle of the steel wire to determine whether it is consistent with the tension at the end points of the wire-receiving end and the wire-releasing end.

[0014] If the detected middle tension is consistent with the end tension, continue cutting; or

[0015] If it is detected that the middle tension is inconsistent with the end point tension, the middle tension is changed by moving the reversing system up and down until the middle tension is consistent with the end point tension, and cutting is continued.

[0016] Preferably, the reversing system comprises an active rotating shaft for adjusting the speed and tension of the steel wire, which is arranged in the middle of the cutting device.

[0017] If the linear speed of the steel wire is low, increase the rotation speeds of the active rotating shaft, the take-up shaft and the pay-off shaft, thereby increasing the linear speed of the steel wire; or,

[0018] If the linear speed of the steel wire is high, the rotation speeds of the active rotating shaft, the wire taking-up shaft and the wire paying-off shaft are reduced, thereby reducing the linear speed of the steel wire.

[0019] Preferably, the detection system includes a tension sensor for detecting the tension of the steel wire, which is arranged on the reversing system; the tension sensor is used to detect the middle tension of the steel wire to determine whether it is consistent with the end point tension.

[0020] Preferably, the reversing system further comprises a lifter for adjusting the height of the active rotating shaft, which is arranged on the active rotating shaft;

[0021] If the middle tension is less than the end tension, the lifter moves the active rotating shaft upward to increase the middle tension; or,

[0022] If the middle tension is greater than the end tension, the lifter moves the active rotating shaft downward to reduce the middle tension.

[0023] The reversing system is used to replace the original central spindle driven system, so that the active rotating shaft has the ability to self-regulate the rotation speed, which greatly reduces the resistance in the steel wire cutting process and solves the problem that the original cutting process can only be carried out by slave rotation through the friction with the steel wire, which increases the resistance of the steel wire, reduces the linear speed of the steel wire, and thus has weak cutting force; the self-regulating rotation speed of the active rotating shaft makes the rotation speed change faster and more convenient, which solves the problem that the original increase in linear speed will lead to a large linear speed at the take-up end and the pay-off end, while the friction resistance between the steel wire and the central spindle is large, so that the linear speed of the steel wire cannot be increased normally.

[0024] A reversing system and a detection system are used to detect and adjust the tension of the cutting device. The reversing system is an active rotating shaft that can move up and down. The tension sensor can detect the tension of the steel wire on the active rotating shaft at any time, which solves the problem that the tension cannot be adjusted, the tension cannot be increased during cutting, and the tension at both ends is inconsistent with the middle tension after forced increase, resulting in short lines and large fluctuations on the cutting surface; when the middle tension detected by the tension sensor is greater than the end point tension controlled by the tension arms at both ends, the lifter moves the active rotating shaft downward to reduce the middle tension, and adjusts it to be consistent with the end point tension before cutting; when the middle tension is less than the end point tension, the lifter moves the active rotating shaft upward to increase the middle tension, and adjusts it to be consistent with the end point tension before cutting. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 This is a schematic diagram of the structure of a large-size single crystal cutting device according to an embodiment of the present invention.

[0026] In the figure:

[0027] 1. Tension arm 2. Take-up shaft 3. Pay-off shaft

[0028] 4. Single crystal 5. Guide wheel 6. Steel wire

[0029] 7. Active rotating shaft 8. Tension sensor 9. Lifter DETAILED DESCRIPTION

[0030] The present invention will be further described below in conjunction with embodiments and drawings:

[0031] In the description of the embodiments of the present invention, it should be understood that the orientation or positional relationship indicated by the terms "top", "bottom", etc. is based on the orientation or positional relationship shown in the accompanying drawings, and 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 cannot be understood as a limitation on the present invention. In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "set" and "connect" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be directly connected, or indirectly connected through an intermediate medium, or it can be a connection between the two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood by specific circumstances.

[0032] In one embodiment of the present invention, Figure 1 As shown in the structural schematic diagram of a large-size single crystal cutting device, a large-size single crystal cutting device includes: a switching system and a detection system, which is characterized in that: the switching system is arranged on the cutting device to adjust the tension and line speed of the steel wire 6; the detection system is arranged on the switching system to detect the tension of the steel wire 6.

[0033] Specifically, the cutting device includes a wire taking-up shaft 2, a wire paying-out shaft 3, a tension arm 1, a guide wheel 5, a steel wire 6, a reversing system and a detection system, wherein the wire taking-up shaft 2 is arranged on the left side, and the wire paying-out shaft 3 is arranged on the right side, and 6 support wheels are arranged between the wire taking-up shaft 2 and the wire paying-out shaft 3 to support the steel wire 6, and 3 are grouped together and close to one side of the wire taking-up shaft 2 and one side of the wire paying-out shaft 3 respectively. There are 2 tension arms 1, which are arranged on the steel wire 6 between the support wheels on both sides to control the tension of the steel wire 6 at both ends of the wire taking-up end and the wire paying-out end, and compare it with the tension detected by the tension sensor 8. If the tension is consistent, cutting continues, and if it is inconsistent, it needs to be adjusted to be consistent before cutting.

[0034] The reversing system includes an active rotating shaft 7 for adjusting the linear speed and tension of the steel wire 6. The active rotating shaft 7 is in the shape of an ordinary shaft and is rotatably connected in the middle position of the cutting device. One end of the steel wire is wound around the pay-off shaft 3, and the other end is wound around the take-up shaft 2, and then passes around the support wheel and the guide wheel 5. The steel wire 6 is tightly wound around the active rotating shaft 7. The active rotating shaft 7 can control its own rotation speed. When the rotation speed of the active rotating shaft 7 is consistent with the linear speed of the steel wire 6, the friction resistance between the steel wire 6 and the active rotating shaft 7 can be reduced, and the linear speed of the steel wire 6 can be better controlled and adjusted, so that the lateral cutting force of the cutting device becomes larger and the cutting speed becomes faster.

[0035] The reversing system also includes a lifter 9, which is made of steel material and has a rectangular shape. The length and width are both greater than the length and width of the active rotating shaft 7, and supports the moving active rotating shaft 7. The upper surface of the lifter 9 to which the active rotating shaft 7 is detachably connected does not affect the free rotation of the active rotating shaft 7 during installation. The lifter 9 can realize the free lifting and lowering of the active rotating shaft 7, and can control the lifting speed and lifting distance, so as to achieve the purpose of adjusting the tension in the middle and making the tension of the steel wire 6 uniform.

[0036] The detection system includes a tension sensor 8 for detecting the tension of the steel wire 6. The tension sensor 8 is installed on the outer surface of the active rotating shaft 7 with bolts. It detects the tension of the steel wire 6 in the middle of the active rotating shaft 7 at any time and compares it with the tension arm 1. After comparison, the middle tension is adjusted, and the active rotating shaft 7 is moved up and down to adjust the middle tension until the tension displayed by the tension sensor 8 is consistent with the tension at the position of the tension arm 1, that is, the middle tension is consistent with the end point tension, and cutting is continued. Adjusting the tension in this way can achieve tension uniformity and solve the problem of uneven tension and large fluctuations in the cutting surface in the prior art.

[0037] A method for using a large-size single crystal cutting device:

[0038] S1: Place the single crystal 4 in the cutting device. The pay-off shaft 3 pays out the steel wire 6, which passes around the support wheel, the guide wheel 5 and the active rotating shaft 7 and is finally wound on the take-up shaft 2. The rotation speed of the pay-off shaft 3 is consistent with that of the take-up shaft 2. While paying and taking up the wire, the linear speed of the cutting at both ends of the steel wire 6 is controlled. The guide wheel 5 drives the steel wire 6 to cut the single crystal.

[0039] S2: Control the cutting speed of the single crystal: adjust the rotation speed of the active rotating shaft 7, adjust the rotation speed of the active rotating shaft 7 to be consistent with the rotation speed of the take-up shaft 2 and the pay-off shaft 3, control the linear speed of the steel wire 6, reduce the friction between the active rotating shaft 7 and the steel wire 6, increase the linear speed, and increase the cutting speed, thereby improving production efficiency. If the cutting speed needs to be increased, the rotation speeds of the take-up shaft 2, the pay-off shaft 3, and the active rotating shaft 7 are increased at the same time, and the rotation speeds of the three shafts must be consistent to control the linear speed of the steel wire 6; if the cutting speed needs to be reduced, the rotation speeds of the take-up shaft 2, the pay-off shaft 3, and the active rotating shaft 7 are reduced at the same time, and the rotation speeds of the three shafts must be consistent to control the linear speed of the steel wire 6.

[0040] S3: Adjust the tension: Use the tension sensor 8 to detect the middle tension of the steel wire 6 at the position of the active rotating shaft 7, and determine whether it is consistent with the endpoint tension at one end of the take-up shaft 2 and the end of the pay-off shaft 3. If the detected middle tension is consistent with the endpoint tension, continue cutting; if the detected middle tension is inconsistent with the endpoint tension, change the middle tension by moving the active rotating shaft 7 up and down through the lifter 9 until the middle tension is consistent with the endpoint tension, and continue cutting.

[0041] If the middle tension is less than the end tension, the lifter 9 moves upward, and the active rotating shaft 7 moves upward accordingly. The moving distance is determined by the difference in the end tensions. The middle tension is increased, and the middle tension is adjusted to be consistent with the end tensions, and cutting is continued; if the middle tension is greater than the end tensions, the lifter 9 moves downward, and the active rotating shaft 7 moves downward accordingly. The moving distance is determined by the difference in the end tensions. The middle tension is reduced, and the middle tension is also adjusted to be consistent with the end tensions, and cutting is continued. Whether the tension is uniform determines the size of the surface fluctuation of the cutting. The more uniform the tension of the steel wire 6, the smaller the surface fluctuation of the single crystal cutting, and the higher the production quality; the more uneven the tension of the steel wire 6, the larger the surface fluctuation of the single crystal cutting, and the lower the production quality.

[0042] In another embodiment of the present invention, the reversing system further comprises a lifter 9, which is made of high temperature resistant plastic, is circular in shape, has a diameter greater than the length and width of the active rotating shaft 7, and moves the active rotating shaft 7. The active rotating shaft 7 is detachably connected to the lower surface of the lifter 9, and the free rotation of the active rotating shaft 7 is not affected during installation. The lifter 9 can realize the free lifting and lowering of the active rotating shaft 7, and can control the lifting speed and lifting distance, so as to adjust the tension in the middle, so that the tension of the steel wire 6 is uniform at each position.

[0043] The embodiments of the present invention are described in detail above, but the contents described are only preferred embodiments of the present invention and cannot be considered to limit the scope of implementation of the present invention. All equivalent changes and improvements made within the scope of the present invention should still fall within the scope of the patent coverage of the present invention.

Claims

1. A large-size single crystal cutting device, characterized in that: Used for squaring single crystal silicon rods, comprising: a reversing system and a detection system arranged on the reversing system; the reversing system is arranged on the cutting device to adjust the tension and linear speed of the steel wire; the detection system is used to detect the tension of the steel wire; the reversing system comprises an active rotating shaft for adjusting the linear speed and tension of the steel wire, which is arranged on the cutting device; the reversing system also comprises a lifter for adjusting the height of the active rotating shaft, which is arranged on the active rotating shaft, the lifter can realize the free lifting and lowering of the active rotating shaft, and can control the lifting speed and lifting distance, so as to adjust the tension in the middle; the active rotating shaft is arranged in the middle position of the cutting device to adjust the tension in the middle of the steel wire and the linear speed of the entire steel wire, one end of the steel wire is wound on the pay-off shaft, and the other end is wound on the take-up shaft, and then passes around the support wheel and the guide wheel, the steel wire is wound on the active rotating shaft, and the active rotating shaft can control its own rotation speed.

2. A large-size single crystal cutting device according to claim 1, characterized in that: The detection system includes a tension sensor for detecting the tension of the steel wire, which is arranged on the reversing system.

3. A method for using a large-size single crystal cutting device as claimed in claim 1, characterized in that: Placing the single crystal in the cutting device, and the guide wheel drives the steel wire to cut the single crystal; Adjusting the rotation speed of the reversing system to coordinate with the rotation speed of the take-up shaft and the pay-off shaft to control the linear speed of the steel wire; The detection system is used to detect the tension in the middle of the steel wire to determine whether it is consistent with the tension at the end points of the wire-receiving end and the wire-releasing end. If the detected middle tension is consistent with the end tension, continue cutting; or If it is detected that the middle tension is inconsistent with the end point tension, the middle tension is changed by moving the reversing system up and down until the middle tension is consistent with the end point tension, and cutting is continued.

4. The method for using a large-size single crystal cutting device according to claim 3, characterized in that: The reversing system includes an active rotating shaft for adjusting the speed and tension of the steel wire, which is arranged in the middle of the cutting device. If the linear speed of the steel wire is low, increase the rotation speeds of the active rotating shaft, the take-up shaft and the pay-off shaft, thereby increasing the linear speed of the steel wire; or, If the linear speed of the steel wire is high, the rotation speeds of the active rotating shaft, the wire taking-up shaft and the wire paying-off shaft are reduced, thereby reducing the linear speed of the steel wire.

5. A method for using a large-size single crystal cutting device according to claim 3 or 4, characterized in that: The detection system includes a tension sensor for detecting the tension of the steel wire, which is arranged on the reversing system; The tension sensor is used to detect the tension in the middle of the steel wire to determine whether it is consistent with the tension at the end points.

6. The method for using a large-size single crystal cutting device according to claim 5, characterized in that: The reversing system further includes a lifter for adjusting the height of the active rotating shaft, which is arranged on the active rotating shaft; If the middle tension is less than the end tension, the lifter moves the active rotating shaft upward to increase the middle tension; or, If the middle tension is greater than the end tension, the lifter moves the active rotating shaft downward to reduce the middle tension.

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