Temperature control system for growing precious metal filaments by micro-down-draw method

Abstract

The invention relates to the technical field of precious metal filament manufacturing, in particular to a temperature control system for growing precious metal filaments through a micro down-draw method, which comprises a crucible and a quartz tube, an induction coil is wound outside the quartz tube, a first temperature thermocouple is arranged in the crucible, and a second temperature thermocouple is arranged at the bottom of the inner side of the crucible. A magnetizer is arranged on the outer side of the induction coil, a cooling assembly is fixedly connected to the bottom of the second flange plate, a crystallizer is arranged in the center of the bottom of the crucible, and a seed crystal guide rod is arranged in the crucible; and the control module is used for adjusting initial parameters required by precious metal wire manufacturing, adjusting the output power of the induction coil and controlling the running speed of the collecting assembly. According to the invention, controllable solidification of fluid can be realized, the position of a solidification interface is stabilized, precious metal wires can directly grow from the melt, the structure-performance is accurately controlled, and finally, short-process and low-cost manufacturing is realized.

Description

Technical Field

[0001] The invention relates to the technical field of precious metal fine wire production, and in particular to a temperature control system used for growing precious metal fine wires by a micro-pull-down method. Background Art

[0002] Due to their special physical and chemical properties (high melting point, oxidation resistance, corrosion resistance, stable physical and chemical properties, etc.), precious metals are widely used in defense industries and key areas of the national economy such as aerospace, medical health, weapons and equipment, energy and chemical industry. Among them, precious metal wires have become key core components due to their high melting point, high oxidation resistance and catalytic properties, and have irreplaceable advantages. For example, PtIr alloy, a reliable ignition material for aircraft engines, ultra-high temperature Ir-Rh thermocouples for oxidizing environments above 2100°C, Pt-W wire for precision potentiometer windings, Pd3Fe alloy coils for contact combustion and thermal linear gas sensors, Au-Pd-Fe high resistance alloys, AuCuPtAg, PdIr electrical contact brush materials, etc.

[0003] It is very difficult to manufacture precious metal wires using traditional technology. They are generally manufactured through various processes such as induction / arc melting → pouring → repeated heat treatment → multiple drawing / deformation. However, this method has the following common problems: (1) low yield rate, complex process, and long manufacturing period. Especially in the deformation stage after melting, the precious metal bulk material needs to undergo multiple deformation and annealing; (2) difficult processing and difficult forming. Some platinum group metals and alloy materials have the characteristics of high melting point, high brittleness, and low plasticity; (3) high manufacturing cost. Forming wires from the initial large ingot will increase manufacturing costs, especially for precious metals. The processing loss of the starting material has a huge impact on the product price; (4) the stability of the structure and performance is difficult to control. Due to the complex influence of the original structure and the heat treatment process on the final structure of the precious metal wire, the phase structure is prone to problems such as uneven characteristics and unstable performance.

[0004] At present, the plastic processing method of precious metal microwire drawing is constrained by the characteristics of cold processing and deformation mode, and it is difficult to prepare high-quality metal filaments. With the development of science and technology, the micro-pull-down method has emerged, which can well solve the drawbacks of the above methods. Micro-pull-down technology is a molten crystal growth technology. Based on the continuous solidification of the melt, the precious metal melt in the crucible flows downward through the thin tube channel at the bottom of the crucible. At the same time, the melt can be transported to the liquid / solid growth interface formed under the crucible under the traction of the seed crystal and the action of gravity and capillary action. The core point is the precise control of the temperature field. A significant advantage of growing precious metal wires using the pull-down method is that it reduces defects such as shrinkage cavities and shrinkage, and improves the overall quality. And because of the effect of gravity, the bubbles inside the melt move to the top of the melt, away from the growth interface, greatly reducing the possibility of bubbles entering the crystal.

[0005] For the micro-pulling technology of precious metal materials, the domestic research foundation is weak. There is no technology and system that can produce precious metal small-diameter wires using the micro-pulling method, and there are no related reports. There are many control principles that need to be mastered and a series of technical problems that need to be solved. The difficulty lies mainly in the precise control of the position of the growth interface. Usually, the position of the growth (liquid / solid) interface is fixed in a stable state, but its position is affected by many factors such as wettability with the melt, temperature gradient, shape and length of the melting zone, and is difficult to achieve. In this regard, the present invention proposes innovations based on the micro-pull-down technology, and proposes a temperature control system for growing precious metal fine wires by the micro-pull-down method, which can achieve controlled solidification of the fluid, and then stabilize the position of the solidification interface, grow precious metal wires directly from the melt, and accurately control the organization-performance, and finally achieve short-process and low-cost manufacturing. Summary of the invention

[0006] To solve the above problems, the present invention provides a temperature control system for growing precious metal fine wires by micro-pull-down method, which can be used to grow small diameter precious metal wires by micro-extraction method, with simple process, high production efficiency, strong applicability and high wire quality.

[0007] In order to achieve the above-mentioned purpose, the technical scheme of the present invention is as follows: a temperature control system for growing precious metal fine wires by micro-pull-down method, comprising a crucible and a quartz tube, wherein the top and bottom ends of the quartz tube are respectively fixedly connected with a first flange and a second flange, the crucible is arranged inside the quartz tube, and the outside of the quartz tube is surrounded by an induction coil for heating and melting the precious metal, a first temperature measuring thermocouple for detecting the temperature of a melt formed by melting the precious metal is arranged inside the crucible, a second temperature measuring thermocouple for measuring the temperature near the meniscus between the precious metal melt and the solid is arranged at the bottom of the inner side of the crucible, a magnetic conductor is arranged outside the induction coil, a cooling assembly is fixedly connected to the bottom of the second flange, a crystallizer connected to the inside of the crucible is arranged at the center of the bottom of the crucible, the bottom end of the crystallizer passes through the second flange and the cooling assembly in sequence, a seed crystal lead rod is arranged inside the crucible, the bottom of the seed crystal lead rod passes through the crucible and the crystallizer in sequence and extends to the outside, and the seed crystal lead rod is slidably connected to the crystallizer and the crucible; and also comprises a collecting assembly for pulling and collecting metal wires;

[0008] It also includes a control module, and the first temperature measuring thermocouple, the second temperature measuring thermocouple, the induction coil, the cooling component and the collection component are all connected to the control module signal; it is used to set the initial parameters required for the production of precious metal wires based on the physical properties of the precious metals; at the same time, based on the monitoring data of the first temperature measuring thermocouple and the second temperature measuring thermocouple, the output power of the induction coil is adjusted; and based on the actual production situation of the precious metal wires, the running rate of the collection component is controlled; it is also used to display the detection data of the first temperature measuring thermocouple and the second temperature measuring thermocouple, and at the same time, the target temperature of any point therein can be set for temperature regulation.

[0009] Furthermore, the central axes of the first flange, the second flange, the quartz tube, the induction coil, the crucible, the crystallizer, the cooling assembly and the seed crystal guide rod are all on the same vertical straight line.

[0010] Furthermore, a first through hole connected to the crucible is provided inside the crystallizer, the diameter of the first through hole close to one end of the crucible is equal to the diameter of the precious metal filament to be grown, the diameter of the first through hole away from one end of the crucible is larger than the diameter of the precious metal filament, and the first through hole is generally truncated cone-shaped.

[0011] Furthermore, the cooling assembly includes a circulating water cooling unit connected to the control module signal, and the circulating water cooling unit is made of copper.

[0012] Furthermore, the collection component includes a clamping roller and a wire winding machine for pulling the precious metal wire, the clamping roller and the wire winding machine are arranged on the collection route of the finished precious metal fine wire, and the clamping roller and the wire winding machine are both connected to the control module signal.

[0013] Furthermore, a second through hole connected to the crystallization tube is opened at the bottom of the crucible, and the diameter of the second through hole is equal to the diameter of the precious metal filament to be grown.

[0014] Furthermore, the control module is also used to control the speed of the wire winding machine and the clamping roller to grow the wire according to the preset pull-down rate parameters.

[0015] Further, the initial parameters include the temperature of the circulating water cooling unit and the melting temperature of the metal material.

[0016] Furthermore, a ventilation assembly for introducing inert gas into the bottom of the crystallization tube is provided at the bottom of the circulating water cooling unit, and the ventilation assembly includes an air pipe and an air pump connected to the air pipe.

[0017] Furthermore, it also includes a feedback module for detecting the working status of the first temperature measuring thermocouple and the second temperature measuring thermocouple. When the change curve of the real-time temperature data detected by the first temperature measuring thermocouple or the second temperature measuring thermocouple deviates from the conventional change curve by more than a preset deviation, an alarm signal is generated and transmitted to the control module, which displays the corresponding alarm image.

[0018] The technical principle of the above scheme is as follows: the metal raw material in the crucible is heated by an induction coil, and the temperature of the melt inside the crucible is detected by a first temperature measuring thermocouple. When the internal temperature is higher than the melting point of the precious metal, the seed crystal guide rod is moved down to contact the bottom of the crucible to form a meniscus at the bottom of the crucible. The temperature near the meniscus is measured by a second temperature measuring thermocouple, and the position of the solid-liquid interface is controlled. By observing the temperature of the second temperature measuring thermocouple displayed by the control module, the induction coil is controlled to adjust the temperature so that the temperature near the meniscus is slightly lower than the melt temperature; the melt temperature is then fine-tuned. When the melt infiltrates the entire bottom of the crucible and the side surface of the melt is not convex, the wire is grown according to the set pull-down rate parameter. The metal wire in the crystallization tube is cooled by a circulating water cooling unit, and an inert gas is introduced to reduce the possibility of oxidation. In addition, the use of the first temperature measuring thermocouple and the second temperature measuring thermocouple is monitored in real time through the feedback module during the whole process.

[0019] The above scheme has the following beneficial effects:

[0020] 1. Compared with the prior art, this solution greatly reduces the raw material loss of the traditional drawing method, the device structure is relatively simple, and the growth rate of the wire can be changed by adjusting the pull-down rate of the clamping roller, and the production efficiency is greatly improved. In the present invention, when the height position of the induction coil is constant, the crucible position with the optimal heating capacity can be adjusted for a specific volume of material in the crucible; the present invention applies a magnetic conductor outside the induction coil to play a magnetic gathering role, which can greatly reduce the energy loss. Thermocouples are set at the top and bottom of the crucible, which can realize the precise monitoring and control of the melt temperature and the temperature near the meniscus, and then fix the position of the solid-liquid interface to ensure the stable growth of the wire; the present invention sets a circulating water cooling unit on the outside of the crystallizer, and changes the cooling rate of the wire by adjusting the water temperature of the circulating water cooling unit, which is conducive to obtaining a fine-grained structure; the internal through hole of the crystallizer adopts a truncated cone structure with a narrow top and a wide bottom, which effectively reduces the friction of the inner wall on the wire, prevents the wire from breaking, and improves the surface quality of the wire.

[0021] 2. In this solution, the control module can not only set the initial parameters according to the physical properties of precious metals, such as the temperature of the cooling component and the melting temperature of the metal material, but also adjust the output power of the induction coil according to the real-time monitoring data and control the operation rate of the collection component. In addition, the control module can also display the detection data of the thermocouple and allow the user to set the target temperature at any point for temperature adjustment, which increases the flexibility and operability of the system, thereby accurately controlling the temperature of the precious metal wire during production and ensuring its cost performance.

[0022] 3. In this solution, the ventilation component introduces inert gas into the bottom of the crystallization tube, which can further protect the wire from adverse effects such as oxidation during the growth and cooling process, and improve the purity and performance of the wire.

[0023] 4. In this solution, the feedback module can detect the working status of the thermocouple and generate an alarm signal when a deviation occurs, which is transmitted to the control module for display. This helps to discover and deal with potential problems in a timely manner, ensuring the stable operation of the system and the quality of the wire.

[0024] Additional aspects and advantages of the present invention will be given in part in the following description and in part will be obvious from the following description, or will be learned through practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 This is a schematic diagram of an embodiment of a temperature control system for growing precious metal filaments by micro-pull-down method according to the present invention;

[0026] Figure 2 A forward cross-sectional view of a crystal tube of an embodiment of a temperature control system for growing precious metal thin wires by micro-pull-down method according to the present invention;

[0027] Figure 3 A front cross-sectional view of a crucible of an embodiment of a temperature control system for growing precious metal thin wires by micro-pull-down method according to the present invention;

[0028] Figure 4 It is an enlarged schematic diagram of the solid-liquid interface of an embodiment of the temperature control system of the present invention for growing precious metal filaments by micro-pull-down method.

[0029] The figure marks in the drawings of the specification include: 1. first temperature measuring thermocouple; 2. first flange; 3. quartz tube; 4. crucible; 5. induction coil; 6. seed crystal guide rod; 7. second flange; 8. circulating water cooling unit; 9. air pipe; 10. crystallization tube; 11. second temperature measuring thermocouple; 12. clamping roller; 13. melt; 14. meniscus; 15. solid-liquid interface; 16. magnetic conductor. DETAILED DESCRIPTION

[0030] The technical solution of the present invention will be described clearly and completely below in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of 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 scope of protection of the present invention.

[0031] In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the drawings, and are 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 limiting the present invention. In addition, the terms "first", "second", and "third" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance.

[0032] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" 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 a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0033] The following is further described in detail through specific implementation methods:

[0034] Embodiment 1:

[0035] As attached Figure 1 , Figure 2 , Figure 3 and Figure 4 As shown: A temperature control system for growing precious metal filaments by micro-pull-down method, comprising a crucible 4 and a quartz tube 3, wherein the top and bottom of the quartz tube 3 are respectively bonded with a first flange 2 and a second flange 7, the crucible 4 is bonded to the inside of the quartz tube 3, the outside of the quartz tube 3 is surrounded by an induction coil 5 for heating and melting the precious metal, a first temperature measuring thermocouple 1 for detecting the temperature of a melt 13 formed by melting the precious metal is placed inside the crucible 4, and a meniscus 14 for measuring the temperature between the precious metal melt 13 and the solid is bonded to the bottom of the inner side of the crucible 4 A second temperature measuring thermocouple 11 of the vicinity temperature, a magnetic conductor 16 is arranged around the outer side of the induction coil 5, a cooling assembly is fixedly connected to the bottom of the second flange 7, a crystallizer connected to the inside of the crucible 4 is bonded to the center of the bottom of the crucible 4, the bottom of the crystallizer passes through the second flange 7 and the cooling assembly in sequence, a seed crystal lead rod 6 is placed inside the crucible 4, the bottom of the seed crystal lead rod 6 passes through the crucible 4 and the crystallizer in sequence and extends to the outside, and the seed crystal lead rod 6 is slidably connected to the crystallizer and the crucible 4; the cooling assembly includes a circulating water cooling unit 8, and the circulating water cooling unit 8 is made of copper. It also includes a collection assembly for pulling and collecting metal wires.

[0036] It also includes a control module, and the first temperature measuring thermocouple 1, the second temperature measuring thermocouple 11, the induction coil 5, the cooling component and the collection component are all connected to the control module signal; it is used to set the initial parameters required for the metal based on the physical properties of the precious metal, wherein the initial parameters include the temperature of the circulating water cooling unit 8 and the melting temperature of the metal material; at the same time, based on the monitoring data of the first temperature measuring thermocouple 1 and the second temperature measuring thermocouple 11, the output power of the induction coil 5 is adjusted; and based on the actual production situation of the precious metal wire, the speed of the wire winding machine and the clamping roller 12 is controlled to grow the wire according to the preset pull-down rate parameters; it is also used to display the detection data of the first temperature measuring thermocouple 1 and the second temperature measuring thermocouple 11, and at the same time, the target temperature of any point therein can be set for temperature regulation.

[0037] The collecting assembly includes a wire winding machine and a clamping roller 12. The clamping roller 12 and the wire winding machine are installed on the collection route of the finished precious metal fine wire material. The clamping roller 12 and the wire winding machine are both connected to the control module signal.

[0038] A first through hole connected to the crucible 4 is provided inside the crystallizer, and the diameter of the first through hole near the end of the crucible 4 is equal to the diameter of the precious metal wire to be grown, and the diameter of the first through hole away from the end of the crucible 4 is larger than the diameter of the precious metal wire, and the first through hole is truncated cone-shaped as a whole; a second through hole connected to the crystallization tube 10 is provided at the bottom of the crucible 4, and the diameter of the second through hole is equal to the diameter of the precious metal wire to be grown.

[0039] The central axes of the flange, the quartz tube 3, the induction coil 5, the crucible 4, the crystallizer, the cooling assembly and the seed crystal guide rod 6 are all on the same vertical straight line.

[0040] In principle, the present invention has no particular restrictions on the conventional size of the through hole at the bottom of the crucible 4. Those skilled in the art can select and adjust it according to actual production conditions, raw material conditions and product requirements. In order to better grow small-diameter precious metal wires and ensure the performance of the precious metal wires, the length of the through hole at the bottom of the crucible 4 is preferably 3 to 9 mm, more preferably 4 to 8 mm, and more preferably 5 to 7 mm.

[0041] In principle, the present invention has no particular restrictions on the material of the crucible 4. Those skilled in the art can select and adjust it according to actual production conditions, raw material conditions and product requirements. In order to better grow small-diameter precious metal wires and ensure the performance of the precious metal wires, the material of the crucible 4 preferably includes one or more of graphite, Al2O3, ZrO2, and BN.

[0042] In principle, the present invention has no particular restriction on the material of the crystallizer. Those skilled in the art can select and adjust it according to actual production conditions, raw material conditions and product requirements. In order to better grow small-diameter precious metal wires and ensure the performance of the precious metal wires, the material of the crystallizer preferably includes one or more of graphite, Al2O3, ZrO2, and BN, and more preferably graphite or BN.

[0043] In principle, the present invention has no particular restrictions on the length and diameter of the crystallizer. Those skilled in the art can select and adjust according to actual production conditions, raw material conditions and product requirements. In order to better grow small-diameter precious metal wires and ensure the performance of the precious metal wires, the length of the crystallizer is preferably 100-150 mm, more preferably 110-140 mm, more preferably 120-130 mm, and the diameter is preferably 11-22 mm, more preferably 13-20 mm, and more preferably 15-18 mm.

[0044] The specific implementation process is as follows: load precious metal material (powder, block, wire) into the crucible 4, wherein the precious metal material takes a PtIr10 alloy block as an example, and the crucible 4 takes a high-purity Al2O3 crucible 4 as an example, set the parameters required for melting the PtIr10 alloy block, and then program the temperature, and then move the 2mm diameter seed crystal guide rod 6 from the bottom of the crystallizer to pass through the bottom of the crucible 4, and the other end of the seed crystal guide rod 6 is fixed on the clamping roller 12; then build a temperature control system for producing precious metal small diameter wires by the μ-PD method, and ensure that the centers of the flange, quartz tube 3, induction coil 5, crucible 4, crystallizer, circulating water cooling unit 8 and seed crystal guide rod 6 are kept on the same vertical line. Then turn on the circulating water cooling unit 8 switch, set the water temperature to maintain at 20-30°C, and then start the induction coil 5 to heat the material to a melt above 1800°C. After the material is completely melted, adjust the temperature of the meniscus 14 to be slightly lower than the melting point of the PtIr10 alloy, observe the state of the melt 13, and when the melt 13 infiltrates the entire bottom end of the crucible 4 and the side surface of the melt 13 is not convex, adjust the rotation rate of the clamping roller 12, and pull down the seed crystal guide rod 6 along the

[100] direction to grow the wire, and obtain a PtIr10 wire with a diameter less than 2 mm and a length greater than 1000 mm.

[0045] Embodiment 2:

[0046] As attached Figure 1 As shown, the difference from Example 1 is that a ventilation assembly for introducing inert gas into the bottom of the crystallization tube 10 is provided at the bottom of the circulating water cooling unit 8, and the ventilation assembly includes an air pipe 9 and an air pump connected to the air pipe 9.

[0047] The specific implementation process is as follows: when the seed crystal guide rod 6 is pulled down to grow the wire, the air pump is started to slowly introduce inert gas into the wire forming part to reduce the possibility of oxidation of the wire with air at high temperature, thereby ensuring the quality of the finished product.

[0048] Embodiment 3:

[0049] The difference from Example 2 is that it also includes a feedback module for detecting the working status of the first temperature measuring thermocouple 1 and the second temperature measuring thermocouple 11. When the change curve of the real-time temperature data detected by the first temperature measuring thermocouple 1 or the second temperature measuring thermocouple 11 deviates from the conventional change curve by more than a preset deviation, an alarm signal is generated and transmitted to the control module, and the control module displays the corresponding alarm image.

[0050] The specific implementation process is as follows: the feedback module monitors the output signal of the thermocouple in real time to determine whether its working state is normal. As a temperature sensing element, there is a specific relationship between the output signal (i.e., thermoelectric potential) of the thermocouple and the temperature. When the thermocouple works normally, its output signal should change steadily with the change of temperature. However, when the thermocouple fails or is damaged, its output signal may be abnormal, such as signal fluctuation, signal interruption, or signal inconsistent with the actual temperature. Therefore, when the output signal of the first temperature measuring thermocouple 1 or the second temperature measuring thermocouple 11 exceeds the preset range or has abnormal fluctuations, the feedback module will determine that the first temperature measuring thermocouple 1 or the second temperature measuring thermocouple 11 is faulty or damaged, and generate a corresponding alarm signal to transmit to the control module, and the control module displays the corresponding alarm image, so that the staff can find problems in time and ensure the normal production.

[0051] Obviously, the above embodiments are merely examples for the purpose of clear explanation, and are not intended to limit the implementation methods. For those skilled in the art, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to list all the implementation methods here. The obvious changes or modifications derived therefrom are still within the scope of protection of the invention.

Claims

1. A temperature control system for growing precious metal filaments by micro-pulling method, comprising a crucible (4), characterized in that: The invention also comprises a quartz tube (3), wherein the top and bottom ends of the quartz tube (3) are respectively fixedly connected with a first flange (2) and a second flange (7), a crucible (4) is arranged inside the quartz tube (3), an induction coil (5) for heating and melting the precious metal is surrounded outside the quartz tube (3), a first temperature measuring thermocouple (1) for detecting the temperature of a melt (13) formed by melting the precious metal is arranged inside the crucible (4), and a second temperature measuring thermocouple (1) for measuring the temperature near the meniscus (14) between the precious metal melt (13) and the solid is arranged at the bottom of the inner side of the crucible (4). An electric couple (11), a magnetic conductor (16) is arranged outside the induction coil (5), a cooling assembly is fixedly connected to the bottom of the second flange (7), a crystallizer connected to the inside of the crucible (4) is arranged at the center of the bottom of the crucible (4), the bottom end of the crystallizer passes through the second flange (7) and the cooling assembly in sequence, a seed crystal guide rod (6) is arranged inside the crucible (4), the bottom of the seed crystal guide rod (6) passes through the crucible (4) and the crystallizer in sequence and extends to the outside, and the seed crystal guide rod (6) is slidably connected to the crystallizer and the crucible (4); and also includes a collection assembly for pulling and collecting metal wires; The invention also comprises a control module, wherein the first temperature measuring thermocouple (1), the second temperature measuring thermocouple (11), the induction coil (5), the cooling component and the collection component are all connected to the control module by signal; the control module is used to set the initial parameters required for the production of the precious metal wire based on the physical properties of the precious metal, and to adjust the output power of the induction coil (5) based on the monitoring data of the first temperature measuring thermocouple (1) and the second temperature measuring thermocouple (11), and to control the running speed of the collection component based on the actual production situation of the precious metal wire; the control module is also used to display the detection data of the first temperature measuring thermocouple (1) and the second temperature measuring thermocouple (11), and can set the target temperature of any point therein for temperature regulation.

2. The temperature control system for growing precious metal filaments by micro-pull-down method according to claim 1, characterized in that: The central axes of the first flange (2), the second flange (7), the quartz tube (3), the induction coil (5), the crucible (4), the crystallizer, the cooling assembly and the seed crystal guide rod (6) are all on the same vertical straight line.

3. The temperature control system for growing precious metal filaments by micro-pulling method according to claim 2, characterized in that: A first through hole connected to the crucible (4) is arranged inside the crystallizer, the diameter of the first through hole close to the crucible (4) is equal to the diameter of the precious metal filament to be grown, the diameter of the first through hole away from the crucible (4) is greater than the diameter of the precious metal filament, and the first through hole is truncated cone-shaped as a whole.

4. The temperature control system for growing precious metal filaments by micro-pulling method according to claim 3, characterized in that: The cooling component comprises a circulating water cooling unit (8) connected to the control module signal, and the circulating water cooling unit (8) is made of copper.

5. The temperature control system for growing precious metal filaments by micro-pull-down method according to claim 4, characterized in that: The collection component comprises a clamping roller (12) and a wire winding machine for pulling precious metal fine wires. The clamping roller (12) and the wire winding machine are arranged on the collection route of the finished precious metal fine wires. The clamping roller (12) and the wire winding machine are both connected to the control module signal.

6. The temperature control system for growing precious metal filaments by micro-pull-down method according to claim 5, characterized in that: A second through hole connected to the crystallization tube (10) is formed at the bottom of the crucible (4), and the diameter of the second through hole is equal to the diameter of the precious metal filament to be grown.

7. The temperature control system for growing precious metal filaments by micro-pull-down method according to claim 6, characterized in that: The control module is also used to control the speed of the winding machine and the nip roller (12) to grow the wire according to the preset draw-down rate parameters.

8. The temperature control system for growing precious metal filaments by micro-pull-down method according to claim 7, characterized in that: The initial parameters include the temperature of the circulating water cooling unit (8) and the melting temperature of the metal material.

9. The temperature control system for growing precious metal filaments by micro-pull-down method according to claim 8, characterized in that: A ventilation assembly for introducing inert gas into the bottom of the crystallization tube (10) is provided at the bottom of the circulating water cooling unit (8), and the ventilation assembly comprises an air pipe (9) and an air pump connected to the air pipe (9).

10. The temperature control system for growing precious metal filaments by micro-pull-down method according to claim 9, characterized in that: It also includes a feedback module for detecting the working status of the first temperature measuring thermocouple (1) and the second temperature measuring thermocouple (11); when the deviation between the change curve of the real-time temperature data detected by the first temperature measuring thermocouple (1) or the second temperature measuring thermocouple (11) and the conventional change curve is greater than a preset deviation, an alarm signal is generated and transmitted to the control module, and the control module displays a corresponding alarm image.

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