Straightening equipment for adjusting coil diameter of thin tungsten filament
By designing a fine tungsten wire coil diameter straightening device and employing multiple stretching and annealing operations, the problems of local stress concentration and irregular coil shape in the production of fine tungsten wire were solved, achieving stable straightening and uniform winding of fine tungsten wire, and ensuring the stability of subsequent processing.
Patent Information
- Application Number
- CN202511384691.4
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-09-26
- Publication Date
- 2025-11-04
AI Technical Summary
During the production process, fine tungsten wire is prone to local stress concentration points, which leads to fluctuations in coil diameter and irregular coil shape, affecting subsequent processing. It is also difficult to achieve constant tension wire feeding, straightening operation and uniform wire winding, and it is impossible to completely eliminate internal stress and spiral residual stress.
Design a device for adjusting the diameter of fine tungsten wire coils and straightening it, including a constant tension wire feeding device, a wire feeding bracket, a front straightening device, an electric heating furnace, and a rear straightening device. Through multiple stretching and annealing operations, the internal stress of the fine tungsten wire is eliminated, achieving a stable straightening effect.
This process avoids localized stress concentration during the production of fine tungsten wire, stabilizes the coil diameter, achieves a straightening effect within the range of 30-100μm, eliminates spiral residual stress, and ensures uniform winding of fine tungsten wire and stability in subsequent processing.
Smart Images
Figure CN120885625A_ABST
Abstract
Description
Technical Field
[0001] This invention relates to the field of fine tungsten wire coil diameter straightening technology, specifically to a device for adjusting and straightening the diameter of fine tungsten wire coils. Background Technology
[0002] Diamond wire is a type of linear cutting tool made by bonding diamond micropowder to metal wire through electroplating resin binders or brazing. With its core advantages of ultra-high hardness, high efficiency, precision, and low loss, it has become the preferred tool for cutting hard and brittle materials such as photovoltaic materials and sapphire in modern industry. Meanwhile, the photovoltaic industry's demand for "thinner, larger, more efficient, and lower-cost" silicon wafers is driving the continuous development of diamond wire towards ultra-fine diameters and ultra-high strength. Tungsten wire, with its excellent ultra-high strength and fine diameter capabilities, has rapidly replaced traditional high-carbon steel wire as the preferred material for diamond wire, meeting the stringent requirements of diamond for its substrate.
[0003] The following technical problems exist in the actual production process: During the production of fine tungsten wires used as diamond busbars, local stress concentration points are prone to occur, which can lead to fluctuations in coil diameter and irregular coil shape, affecting subsequent processing. How to achieve constant tension wire feeding during the production process of straightening fine tungsten wires to prevent the fine tungsten wires from being stretched thin or loosened; How to achieve a wire diameter range of 30-100μm that can be straightened for fine tungsten wires; How to perform the wire feeding, straightening, annealing, and winding operations on fine tungsten wires to completely eliminate the internal stress of the fine tungsten wires and stabilize the straightening effect of the fine tungsten wires? A single straightening operation cannot eliminate the spiral residual stress generated during the tungsten wire drawing process, resulting in a large rebound in the diameter of the finished product. How to achieve uniform winding and arrangement of fine tungsten wires to avoid secondary bending caused by interlayer compression.
[0004] In view of the above, in order to overcome the existing problems, the present invention designs a device for adjusting the diameter of fine tungsten wire coils and straightening them, thus solving the above technical problems. Summary of the Invention
[0005] The purpose of this invention is to address the above-mentioned problems by providing a device for adjusting the diameter of fine tungsten wire coils. This device can avoid localized stress concentration points during the production of fine tungsten wires, reduce diameter fluctuations, prevent irregular coil shapes that could affect subsequent processing, achieve constant tension during the straightening process, prevent the tungsten wires from being stretched thin or loosened, and allow for straightening of wire diameters ranging from 30-100 μm. The device performs wire feeding, straightening, annealing, and take-up operations, thoroughly eliminating internal stress in the fine tungsten wires, stabilizing the straightening effect, and eliminating helical residual stress generated during the wire drawing process through multiple straightening operations.
[0006] To achieve the above objectives, the technical solution adopted by the present invention is as follows: A device for adjusting the diameter of a fine tungsten wire coil and straightening it includes a machine housing. The machine housing is equipped with a constant tension wire feeding device for the wire feeding operation of the fine tungsten wire. The fine tungsten wire fed from the constant tension wire feeding device passes sequentially through a wire feeding support device, a front straightening device, an electric heating furnace device, a rear straightening device, and a take-up and wire laying device. The wire feeding bracket device is used to guide the fine tungsten wire released from the chassis and transport it into the front straightening device; The front straightening device is used to perform preliminary stretching and straightening of the fine tungsten wire to eliminate stress. After stress elimination, it is horizontally conveyed to the electric heating furnace device. An electric heating furnace is used to heat and anneal fine tungsten wires that have been stretched and straightened by a front-end straightening device. The rear straightening device is used to stretch and straighten the fine tungsten wire after the heating and annealing operation. The take-up and winding device is used to perform a uniform and stable take-up operation on fine tungsten wires.
[0007] As a further improvement to the above solution, the constant tension wire feeding device includes a first bracket, a first rotating shaft is disposed inside the first bracket, a tungsten wire disc is disposed at one end of the first rotating shaft extending out of the first bracket, and a driven pulley disposed on the first rotating shaft is connected to the driving pulley on the wire feeding servo motor through a first belt.
[0008] As a further improvement to the above solution, the wire feeding bracket device includes a second bracket with an L-shaped bent plate structure, and a wire feeding guide wheel is provided on the inner wall of the top of the second bracket.
[0009] As a further improvement to the above solution, the front straightening device includes a vertically arranged first mounting plate, a first transition guide wheel and a first active straightening multi-groove wheel are arranged on the first mounting plate, a first driven straightening multi-groove wheel is arranged below the first active straightening multi-groove wheel, and first swing rod guide wheels are symmetrically arranged on both sides of the first driven straightening multi-groove wheel and on the first mounting plate. Fine tungsten wire is wound back and forth repeatedly in the grooves of the first active straightening multi-groove wheel and the first driven straightening multi-groove wheel to perform a stretching and straightening operation.
[0010] As a further improvement to the above scheme, the first active straightening multi-grooved wheel is connected to the first reducer and the first straightening servo motor at its end, the first swing rod guide wheel is set on the swing rod, and the swing rod is connected to the output shaft end of the first swing guide wheel servo motor.
[0011] As a further improvement to the above solution, the electric heating furnace device includes a lower support shell for the electric heating furnace, an electric heating tube is installed inside the lower support shell for the electric heating furnace, the lower support shell for the electric heating furnace is connected to the upper shell for the electric heating furnace via a hinge, and a lower insulation layer and an upper insulation layer are respectively installed inside the lower support shell for the electric heating furnace and the upper shell for the electric heating furnace.
[0012] As a further improvement to the above solution, a second reciprocating guide wheel and a first reciprocating guide wheel are flush on both sides of the electric heating furnace device. After the fine tungsten wire passes through the electric heating furnace device, it moves back and forth between the second reciprocating guide wheel and the first reciprocating guide wheel multiple times.
[0013] As a further improvement to the above solution, the rear straightening device includes a second mounting plate. The second mounting plate is provided with a second transition guide wheel, a second active straightening multi-grooved wheel, a second driven straightening multi-grooved wheel, a second swing rod guide wheel, and the second mounting plate. The fine tungsten wire is wound through the second transition guide wheel, the second active straightening multi-grooved wheel, the second driven straightening multi-grooved wheel, the second swing rod guide wheel, and the second mounting plate before passing through the wire take-up and laying device. The end of the second active straightening multi-grooved wheel is connected to a second reducer and a second straightening servo motor. The second swing rod guide wheel is set on the swing rod body, and the swing rod body is connected to the output shaft end of the second swing guide wheel servo motor.
[0014] As a further improvement to the above solution, the take-up and cable-laying device includes a movable seat, a second rotating shaft is provided on the movable seat, a take-up wheel is provided at one end of the second rotating shaft extending out of the movable seat, and a driven pulley provided on the second rotating shaft is connected to the driving pulley at the output shaft end of the take-up servo motor via a second belt.
[0015] As a further improvement to the above solution, the slider at the bottom of the movable seat is slidably mounted on the guide rail, and the side of the movable seat is connected to the telescopic shaft end of the linear motor.
[0016] Compared with the prior art, the beneficial effects of the present invention are as follows: it can avoid the phenomenon of local stress concentration points in the production process of fine tungsten wire, reduce the fluctuation of the diameter of fine tungsten wire, avoid irregular coil shape, and affect subsequent processing. It can achieve constant tension wire feeding in the production process of straightening fine tungsten wire, avoid the fine tungsten wire being pulled thin or loosened, achieve a wire diameter range of 30-100μm that can be straightened, and realize wire feeding, straightening, annealing and winding operations of fine tungsten wire, completely eliminate the internal stress of fine tungsten wire, stabilize the straightening effect of fine tungsten wire, and eliminate the spiral residual stress generated in the tungsten wire drawing process through multiple straightening operations. Attached Figure Description
[0017] Figure 1 This is a three-dimensional structural diagram of the present invention.
[0018] Figure 2 This is a schematic diagram of the main structure of the present invention.
[0019] Figure 3 This is a top view of the structure of the present invention.
[0020] Figure 4 This is a side view of the structure of the present invention.
[0021] Figure 5 This is a side view of the structure during the straightening operation of the fine tungsten wire according to the present invention.
[0022] The text labels in the diagram represent: 1. Chassis; 2. Constant tension wire feeding device; 3. Wire feeding support device; 4. Front straightening device; 5. Electric heating furnace device; 6. Rear straightening device; 7. Wire take-up and laying device; 8. First reciprocating guide roller; 9. Second reciprocating guide roller; 201. First support; 202. First belt; 203. First rotating shaft; 204. Tungsten wire reel; 205. Wire feeding servo motor; 301. Second support; 302. Wire feeding guide roller; 401. First transition guide roller; 402. First swing arm guide roller; 403. First active straightening multi-grooved roller; 404. First driven straightening multi-grooved roller; 405. First mounting plate; 406. First reducer; 407. First straightening servo motor. Servo motor; 408, First swing guide wheel servo motor; 501, Upper housing of electric furnace; 502, Upper insulation layer; 503, Hinge; 504, Heating tube; 505, Lower insulation layer; 506, Lower support housing of electric furnace; 601, Second transition guide wheel; 602, Second active straightening multi-groove wheel; 603, Second driven straightening multi-groove wheel; 604, Second swing arm guide wheel; 605, Second mounting plate; 606, Second straightening servo motor; 607, Second reducer; 608, Second swing guide wheel servo motor; 701, Guide rail; 702, Movable seat; 703, Take-up servo motor; 704, Linear motor; 705, Second belt; 706, Second rotating shaft; 707, Take-up reel. Detailed Implementation
[0023] To enable those skilled in the art to better understand the technical solution, the present invention will be described in detail below with reference to embodiments. The description in this part is only exemplary and explanatory, and should not be used to limit the scope of protection of the present invention in any way.
[0024] like Figures 1-5 As shown, the specific solution of this embodiment is: a device for adjusting the diameter of a fine tungsten wire coil and straightening it, including a machine housing 1, a constant tension wire feeding device 2 for the fine tungsten wire feeding operation is provided on the machine housing 1, and the fine tungsten wire fed from the constant tension wire feeding device 2 passes sequentially through a wire feeding bracket device 3, a front straightening device 4, an electric heating furnace device 5, a rear straightening device 6, and a take-up and wire laying device 7. The wire feeding bracket device 3 is used to guide the fine tungsten wire released from the machine housing 1 and transport it into the front straightening device 4; The front straightening device 4 is used to perform preliminary stretching and straightening of the fine tungsten wire to eliminate stress. After stress elimination, it is horizontally conveyed to the electric heating furnace device 5. Electric heating furnace device 5 is used to heat and anneal the fine tungsten wire that has been stretched and straightened by the front straightening device 4. The rear straightening device 6 is used to stretch and straighten the fine tungsten wire after the heating and annealing operation. The take-up and winding device 7 is used to perform a uniform and stable take-up operation on the fine tungsten wire.
[0025] More specifically, the chassis 1 serves as the carrier for all components, and is equipped with an electrical control box and control circuit. The fine tungsten wire is released from the constant tension wire feeding device 2 and passes through the wire feeding bracket device 3, the front straightening device 4, the electric heating furnace device 5, the rear straightening device 6, and the take-up and wire laying device 7 in sequence. Through repeated stretching and straightening operations, the phenomenon of local stress concentration points during the production of fine tungsten wire is avoided.
[0026] As a preferred embodiment of the above, the constant tension wire feeding device 2 includes a first bracket 201, a first rotating shaft 203 is disposed inside the first bracket 201, a tungsten wire disc 204 is disposed at one end of the first rotating shaft 203 extending out of the first bracket 201, and a driven pulley disposed on the first rotating shaft 203 is connected to the driving pulley on the wire feeding servo motor 205 through a first belt 202.
[0027] More specifically, the wire feeding servo motor 205 is used to achieve precise control of the tungsten wire reel 204 for constant tension wire feeding. The wire feeding servo motor 205 drives the first rotating shaft 203 to rotate through the first belt 202, thereby causing the tungsten wire reel 204 to rotate for wire feeding. The tungsten wire reel 204 has an I-shaped structure, and the first bracket 201 serves to support the tungsten wire reel 204.
[0028] As a preferred embodiment of the above, the wire feeding bracket device 3 includes a second bracket 301 with an L-shaped bent plate structure, and a wire feeding guide wheel 302 is provided on the inner wall of the top of the second bracket 301.
[0029] More specifically, the second support 301 provides support, and the wire feeding guide wheel 302 provides guidance, assisting in the transition of the fine tungsten wire from the tungsten wire disc 204 to the first transition guide wheel 401.
[0030] As a preferred embodiment of the above, the front straightening device 4 includes a vertically arranged first mounting plate 405. A first transition guide wheel 401 and a first active straightening multi-groove wheel 403 are arranged on the first mounting plate 405. A first driven straightening multi-groove wheel 404 is arranged below the first active straightening multi-groove wheel 403. First swing rod guide wheels 402 are symmetrically arranged on both sides of the first driven straightening multi-groove wheel 404 and on the first mounting plate 405. Fine tungsten wire is wound back and forth repeatedly in the grooves of the first active straightening multi-groove wheel 403 and the first driven straightening multi-groove wheel 404 to perform a stretching and straightening operation.
[0031] More specifically, this application sets up a first active straightening multi-grooved wheel 403 and a first driven straightening multi-grooved wheel 404. The fine tungsten wire is subjected to multiple reciprocating winding, stretching and straightening operations through the first transition guide wheel 401, the first active straightening multi-grooved wheel 403, the first driven straightening multi-grooved wheel 404 and the first swing rod guide wheel 402. The setting of the first swing rod guide wheel 402 can output torque through the first swing guide wheel servo motor 408, thereby realizing that the first swing rod guide wheel 402 accurately applies straightening tension to the fine tungsten wire, while avoiding the problem of wire breakage.
[0032] In a preferred embodiment of the above, the first active straightening multi-grooved wheel 403 is connected to the first reducer 406 and the first straightening servo motor 407 at its end, and the first swing rod guide wheel 402 is disposed on the swing rod, and the swing rod is connected to the output shaft end of the first swing guide wheel servo motor 408.
[0033] As a preferred embodiment of the above, the electric heating furnace device 5 includes a lower support shell 506, an electric heating tube 504 is disposed inside the lower support shell 506, the lower support shell 506 is connected to the upper shell 501 of the electric heating furnace via a hinge 503, and a lower insulation layer 505 and an upper insulation layer 502 are respectively disposed inside the lower support shell 506 and the upper shell 501 of the electric heating furnace.
[0034] More specifically, the heating element 504 adopts PID temperature control to achieve stable operation and precise temperature control, meeting process requirements. It is used for multi-pass heating and annealing of the initially straightened fine tungsten wire, with the temperature controlled at 400-750℃. The lower insulation layer 505 and the upper insulation layer 502 are made of insulation bricks to play a role in heat preservation.
[0035] As a preferred embodiment of the above, the electric heating furnace device 5 has a second reciprocating guide wheel 9 and a first reciprocating guide wheel 8 flush on both sides. After the fine tungsten wire passes through the electric heating furnace device 5, it moves back and forth between the second reciprocating guide wheel 9 and the first reciprocating guide wheel 8 multiple times.
[0036] More specifically, after the fine tungsten wire passes through the electric heating furnace device 5, it moves back and forth multiple times between the second reciprocating guide wheel 9 and the first reciprocating guide wheel 8 to perform multiple annealing operations on the fine tungsten wire, and then the wire is straightened by applying tension through the rear straightening device 6.
[0037] As a preferred embodiment of the above, the rear straightening device 6 includes a second mounting plate 605. The second mounting plate 605 is provided with a second transition guide wheel 601, a second active straightening multi-grooved wheel 602, a second driven straightening multi-grooved wheel 603, a second swing rod guide wheel 604, and the second mounting plate 605. The fine tungsten wire is wound through the second transition guide wheel 601, the second active straightening multi-grooved wheel 602, the second driven straightening multi-grooved wheel 603, the second swing rod guide wheel 604, and the second mounting plate 605 before passing through the take-up and cable laying device 7. The end of the second active straightening multi-grooved wheel 602 is connected to the second reducer 607 and the second straightening servo motor 606. The second swing rod guide wheel 604 is provided on the swing rod body, and the swing rod body is connected to the output shaft end of the second swing guide wheel servo motor 608.
[0038] More specifically, the components on the rear straightening device 6 perform a straightening and stretching operation on the annealed fine tungsten wire again, so as to achieve a wire diameter range of 30-100μm that can be straightened.
[0039] As a preferred embodiment of the above, the take-up and cable-laying device 7 includes a movable seat 702, a second rotating shaft 706 is provided on the movable seat 702, a take-up wheel 707 is provided at one end of the second rotating shaft 706 extending out of the movable seat 702, and a driven pulley provided on the second rotating shaft 706 is connected to the driving pulley at the output shaft end of the take-up servo motor 703 through a second belt 705.
[0040] As a preferred embodiment of the above, the slider at the bottom of the movable seat 702 is slidably mounted on the guide rail 701, and the side of the movable seat 702 is connected to the telescopic shaft end of the linear motor 704.
[0041] More specifically, the take-up servo motor 703 drives the second rotating shaft 706 to rotate, the take-up wheel 707 winds up the straightened fine tungsten wire, and the linear motor 704 can drive the movable seat 702 to move linearly along the guide rail 701, thereby achieving the operation of uniformly winding up the fine tungsten wire.
[0042] The specific working principle of this invention is as follows: The casing 1 serves as the carrier for all components, housing the electrical control box and control circuitry. Fine tungsten wire is released from the constant tension wire feeding device 2, passing sequentially through the wire feeding support device 3, the front straightening device 4, the electric heating furnace device 5, the rear straightening device 6, and the take-up and laying device 7. Through repeated stretching and straightening operations, localized stress concentration points are avoided during the fine tungsten wire production process. The wire feeding servo motor 205 is used to precisely control the constant tension wire feeding of the tungsten wire reel 204. 5. The first belt 202 drives the first rotating shaft 203 to rotate, thereby causing the tungsten wire spool 204 to rotate for wire feeding. The tungsten wire spool 204 has an I-shaped structure. The first bracket 201 supports the tungsten wire spool 204. This application provides a first active straightening multi-grooved wheel 403 and a first driven straightening multi-grooved wheel 404. The fine tungsten wire is fed through the first transition guide wheel 401, the first active straightening multi-grooved wheel 403, the first driven straightening multi-grooved wheel 404, and the first swing rod guide wheel 402. In the repeated winding, stretching, and straightening operations, the first swing guide wheel 402 is configured to output torque via the first swing guide wheel servo motor 408, thereby enabling the first swing guide wheel 402 to precisely apply straightening tension to the fine tungsten wire without causing wire breakage. The heating element 504 employs PID temperature control to achieve stable operation and precise temperature control, meeting process requirements. It is used for multi-pass heating and annealing of the initially straightened fine tungsten wire, with the temperature controlled between 400-750℃. The lower insulation layer 505 and the upper insulation layer... The heat preservation layer 502 is made of insulating bricks to provide insulation. The components of the rear straightening device 6 straighten and stretch the annealed fine tungsten wire again, so that the wire diameter range of the fine tungsten wire that can be straightened is 30-100μm. The take-up servo motor 703 drives the second rotating shaft 706 to rotate. The take-up wheel 707 winds up the straightened fine tungsten wire. The linear motor 704 can push the movable seat 702 to move linearly along the guide rail 701, thereby realizing the operation of uniformly winding the fine tungsten wire.
[0043] It should be noted that, in this document, the terms "including," "comprising," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Specific examples have been used in this document to illustrate the principles and implementation methods of the present invention. These examples are merely for the purpose of helping to understand the method and core ideas of the present invention. The above descriptions are only preferred embodiments of the present invention. It should be pointed out that, due to the limitations of written expression and the objective existence of infinite specific structures, those skilled in the art can make several improvements, modifications, or variations without departing from the principles of the present invention, and can also combine the above technical features in an appropriate manner. These improvements, modifications, variations, or combinations, or the direct application of the inventive concept and technical solution to other situations without modification, should all be considered within the scope of protection of the present invention.
Claims
1. A device for adjusting and straightening the diameter of a fine tungsten wire coil, characterized in that, Includes a housing (1), on which a constant tension wire feeding device (2) for feeding fine tungsten wire is provided. The fine tungsten wire fed from the constant tension wire feeding device (2) passes through a wire feeding support device (3), a front straightening device (4), an electric heating furnace device (5), a rear straightening device (6), and a take-up and wire laying device (7) in sequence. The wire feeding bracket device (3) is used to guide the fine tungsten wires released from the machine housing (1) and transport them into the front straightening device (4); The front straightening device (4) is used to perform preliminary stretching and straightening of the fine tungsten wire to eliminate stress. After stress elimination, it is horizontally conveyed to the electric heating furnace device (5). The electric heating furnace device (5) is used to heat and anneal the fine tungsten wire that has been stretched and straightened by the front straightening device (4); The rear straightening device (6) is used to perform a second stretching and straightening operation on the fine tungsten wire after the heating and annealing operation. The take-up and take-up device (7) is used to perform a uniform and stable take-up operation on the fine tungsten wire.
2. The device for adjusting the diameter of a fine tungsten wire coil as described in claim 1, characterized in that, The constant tension wire feeding device (2) includes a first bracket (201), a first rotating shaft (203) is provided inside the first bracket (201), a tungsten wire disc (204) is provided at one end of the first rotating shaft (203) extending out of the first bracket (201), and a driven pulley provided on the first rotating shaft (203) is connected to the driving pulley on the wire feeding servo motor (205) through a first belt (202).
3. The device for adjusting the diameter of a fine tungsten wire coil as described in claim 1, characterized in that, The wire feeding bracket device (3) includes a second bracket (301) with an L-shaped bent plate structure, and a wire feeding guide wheel (302) is provided on the inner wall of the top of the second bracket (301).
4. The device for adjusting the diameter of a fine tungsten wire coil according to claim 1, characterized in that, The front straightening device (4) includes a vertically arranged first mounting plate (405), a first transition guide wheel (401) and a first active straightening multi-groove wheel (403) are arranged on the first mounting plate (405), a first driven straightening multi-groove wheel (404) is arranged below the first active straightening multi-groove wheel (403), and a first swing rod guide wheel (402) is symmetrically arranged on both sides of the first driven straightening multi-groove wheel (404) and on the first mounting plate (405). The fine tungsten wire is wound back and forth multiple times in the grooves of the first active straightening multi-groove wheel (403) and the first driven straightening multi-groove wheel (404) to perform a stretching and straightening operation.
5. The device for adjusting the diameter of a fine tungsten wire coil according to claim 4, characterized in that, The first active straightening multi-grooved wheel (403) is connected to the first reducer (406) and the first straightening servo motor (407) at its end. The first swing rod guide wheel (402) is set on the swing rod, and the swing rod is connected to the output shaft end of the first swing guide wheel servo motor (408).
6. The device for adjusting the diameter of a fine tungsten wire coil according to claim 1, characterized in that, The electric heating furnace device (5) includes a lower support shell (506) for the electric heating furnace, an electric heating tube (504) is installed inside the lower support shell (506), the lower support shell (506) for the electric heating furnace is connected to the upper shell (501) of the electric heating furnace through a hinge (503), and a lower insulation layer (505) and an upper insulation layer (502) are respectively installed inside the lower support shell (506) and the upper shell (501).
7. The device for adjusting the diameter of a fine tungsten wire coil according to claim 6, characterized in that, The electric heating furnace device (5) has a second reciprocating guide wheel (9) and a first reciprocating guide wheel (8) flush on both sides. After the fine tungsten wire passes through the electric heating furnace device (5), it moves back and forth between the second reciprocating guide wheel (9) and the first reciprocating guide wheel (8) multiple times.
8. The device for adjusting the diameter of a fine tungsten wire coil according to claim 1, characterized in that, The rear straightening device (6) includes a second mounting plate (605). The second mounting plate (605) is provided with a second transition guide wheel (601), a second active straightening multi-grooved wheel (602), a second driven straightening multi-grooved wheel (603), a second swing rod guide wheel (604), and a second mounting plate (605). The fine tungsten wire is wound around the second transition guide wheel (601), the second active straightening multi-grooved wheel (602), the second driven straightening multi-grooved wheel (603), the second swing rod guide wheel (604), and the second mounting plate (605) and then passes through to the take-up and cable laying device (7). The end of the second active straightening multi-grooved wheel (602) is connected to the second reducer (607) and the second straightening servo motor (606). The second swing rod guide wheel (604) is set on the swing rod body. The swing rod body is connected to the output shaft end of the second swing guide wheel servo motor (608).
9. The device for adjusting the diameter of a fine tungsten wire coil according to claim 1, characterized in that, The take-up and cable laying device (7) includes a movable seat (702), a second rotating shaft (706) is provided on the movable seat (702), a take-up wheel (707) is provided at one end of the second rotating shaft (706) extending out of the movable seat (702), and a driven pulley provided on the second rotating shaft (706) is connected to the drive pulley at the output shaft end of the take-up servo motor (703) via a second belt (705).
10. A straightening device for adjusting the diameter of a fine tungsten wire coil according to claim 9, characterized in that, The slider at the bottom of the movable seat (702) is slidably mounted on the guide rail (701), and the side of the movable seat (702) is connected to the telescopic shaft end of the linear motor (704).