A composite guide rod for growing precious metal fine wires and thin sheets by micro-pull-down method

Abstract

The present invention relates to the field of crystal growth technology, and specifically to a composite guide rod for growing precious metal fine wires and thin sheets using a micro-downdraw method. The composite guide rod comprises a crucible, and a composite guide rod for growing precious metals in the crucible is provided on a motion trajectory at the bottom of the crucible. The composite guide rod comprises a fixedly connected traction rod and a stretching rod. The upper traction rod is made of the same material as the target wire or sheet on which the precious metal is to be grown, and the diameter or width of the traction rod and the stretching rod are the same as the diameter or width of the target wire or sheet. The lower stretching rod is made of tungsten alloy, and the connection between the traction rod and the stretching rod is a resistance welding point. The bottom end of the stretching rod is symmetrically provided with clamping rollers for clamping and pulling the composite guide rod downward, and the centers of the crucible, the composite guide rod, and the clamping rollers are located on the same vertical line. The present invention is used for growing small-diameter precious metal wires using a micro-drawing method to solve the problems existing in the above-mentioned existing preparation technologies, and has a simple process, high production efficiency, and strong applicability.

Description

Technical Field

[0001] The invention relates to the technical field of crystal growth, in particular to a composite guide rod used for growing precious metal fine wires and thin sheets by a micro-pull-down method. Background Art

[0002] Industrial precious metals such as platinum (Pt) and iridium (Ir) possess high oxidation and corrosion resistance, high melting points, and catalytic properties, and have been applied in various fields. In the automotive industry, needle-shaped iridium alloys serve as electrodes in engine spark plugs to effectively detonate gaseous fuels. In aerospace, PtIr alloys are used as ignition materials in aircraft engines, ensuring proper engine startup under extreme conditions. In medical devices, precious metal wires are used to manufacture electrode leads for pacemakers due to their excellent corrosion resistance and biocompatibility. In the energy and chemical industries, platinum wire is used to manufacture thermocouples for use at high temperatures. The stability and reliability of precious metal wires in extreme environments such as high temperature, high pressure, and severe corrosion are unmatched by other materials.

[0003] However, directly producing precious metal wire is difficult, and various forming processes, including wire drawing and forging, are currently used. Similarly, precious metal sheets are produced using various forming processes, including rolling and forging. Ingots are first produced through arc melting and casting, and then undergo multiple hot working processes. However, processing losses during hot working increase manufacturing costs, especially for metals and alloys with poor machinability, such as iridium and iridium alloys. Furthermore, initial material loss and labor costs also increase manufacturing costs.

[0004] The plastic processing method for drawing precious metal microwires is constrained by the characteristics of cold working and deformation, making it difficult to produce high-quality metal filaments. Application number 201910380957.6, entitled "Method for Preparing Oxide-Reinforced Platinum-Rhodium-Based Composite Wires and Invention Patent for Platinum-Rhodium-Based Composite Wires," discloses a process for preparing precious metal platinum-rhodium-based composite wires through high-frequency vacuum induction melting—water-cooled copper mold casting—hot forging—vacuum annealing—extrusion—multiple drawing and annealing. However, this process is complex, with multiple heat treatments and thermal processing processes requiring strict temperature and time control, requiring extensive manual effort, and resulting in certain losses.

[0005] The invention patent application, number 201810994718.5, is titled "A Method for Preparing Ultrafine Medical Platinum-Tungsten Alloy Wire." The process involves vacuum casting, multiple cold rolling cycles followed by annealing, and then multiple wire drawing cycles followed by annealing. However, this process requires multiple rolling and wire drawing cycles, resulting in a lengthy and time-consuming process. A single cold rolling and annealing cycle can take up to 50 minutes, while a single wire drawing cycle can take up to 20 minutes.

[0006] At present, there is no production process that can make the starting material into fibrous, linear or sheet-like shapes in one operation by traditional methods. We understand that various functional inorganic material single crystals have been prepared using the micro-pull-down method. The micro-pull-down method is one of the melt crystal growth technologies. It is based on the continuous solidification of the melt. The melt is supplied from the outlet at the bottom of the crucible to the growth interface and solidified below the crucible. Under the traction of the seed crystal guide rod, the melt is pulled down from the bottom of the crucible, and a single crystal can be grown in a controllable manner. Compared with traditional crystal growth methods, the micro-pull-down technology is relatively simple and extremely fast, and is widely used in materials research.

[0007] A significant advantage of growing precious metal wires or sheets using the pull-down method is that it reduces defects such as shrinkage cavities and shrinkage, thereby improving overall quality. Due to the effect of gravity, bubbles in the melt move to the top of the melt, away from the growth interface, greatly reducing the possibility of bubbles entering the crystal. For the micro-pulling technology of precious metal materials, the domestic research foundation is weak. There is currently no technology or system that can produce small-diameter precious metal wires and thin sheets 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. Among them, the selection of composite guide rod materials and the design of geometric structures are the first issues to be considered. The selection of seed crystal composite guide rod materials must meet the following conditions: (1) High melting point. The melting point of the composite guide rod material cannot be lower than the melting point of the prepared alloy to ensure that there is only one solid-liquid interface below the crucible. (2) High hardness and high strength. The seed crystal composite guide rod needs to be fixed on the clamping roller, and the composite guide rod is driven downward by the rotation of the clamping roller. (3) Reduce costs. On the basis of meeting the above requirements, try to use low-cost materials to reduce production costs. The geometry of the seed crystal composite guide rod needs to meet the condition that its upper end can be well bonded with the precious metal melt. If the upper end of the composite guide rod cannot be bonded with the melt, the wire and sheet cannot be successfully pulled out, or the pulled wire and sheet are short in length.

[0008] In this regard, the present invention proposes an innovation based on the micro-pull-down technology, and develops a composite guide rod suitable for growing high-melting-point precious metal alloy fine wires and thin sheets, which can realize continuous pull-down of precious metal wires and thin sheets, and directly grow small-diameter precious metal wires or extremely thin sheets from the melt, ultimately achieving short-process and low-cost manufacturing. Summary of the Invention

[0009] In order to solve the above problems, the present invention provides a composite guide rod for growing precious metal fine wires and thin sheets by micro-pull-down method, which is used for growing small-diameter precious metal wires by micro-extraction method to solve the problems existing in the above-mentioned existing preparation technology. It has simple process, high production efficiency and strong applicability.

[0010] To achieve the above-mentioned object, the technical solution of the present invention is as follows: a composite guide rod for growing precious metal fine wires and thin sheets by micro-pull-down method, comprising a crucible, a composite guide rod for growing precious metal in the crucible provided on a motion track at the bottom of the crucible, the composite guide rod comprising a pulling rod and a stretching rod fixedly connected in sequence from top to bottom, the pulling rod being made of the same material as the target wire or sheet, and the diameter or width of the pulling rod and the stretching rod being the same as the diameter or width of the target wire or sheet;

[0011] The lower tensile rod is made of tungsten alloy. The connection between the traction rod and the tensile rod is a resistance welding point. The length of the composite lead rod inserted into the crucible does not exceed the resistance welding point.

[0012] The bottom end of the stretching rod is symmetrically provided with clamping rollers for clamping and pulling the composite lead rod downward, and the centers of the crucible, the composite lead rod and the clamping rollers are located on the same vertical line.

[0013] Furthermore, the total length of the composite guide rod is preferably 650 mm to 900 mm; the length of the traction rod is preferably 110 to 160 mm; and the length of the stretching rod is preferably 500 to 750 mm.

[0014] Furthermore, the melting point of the tensile rod is higher than 3000°C.

[0015] The above scheme has the following beneficial effects:

[0016] 1. In this solution, the pull rod is made of the same material and diameter as the target filament, ensuring that only a single solid-liquid interface forms during the entire growth process. Stable control of the solid-liquid interface is crucial for uniform filament growth, effectively avoiding defects in the filament or sheet, such as cracks and unevenness, caused by an unstable interface.

[0017] 2. In this solution, the tensile rod is made of tungsten alloy. Compared with precious metal materials, tungsten alloy has a lower cost, but also has good mechanical properties and thermal stability. This composite structure design can significantly reduce the overall cost while ensuring the performance of the composite guide rod. The tungsten alloy tensile rod is not only low in cost, but also has high strength, high hardness and good thermal conductivity. In addition, the tensile rod made of tungsten alloy has a melting point above 3000℃. Even if the melting temperature reaches the melting point of precious metal alloys, it will not melt. This allows the composite guide rod to better withstand tensile force and thermal stress during the micro-pull-down growth process, thereby improving the growth stability and quality of the wire.

[0018] 3. In this solution, the total length of the composite guide rod and the specific lengths of the pulling rod and the stretching rod ensure the best growth effect and operational convenience, which is not only conducive to the uniform growth of wires and sheets, but also convenient for operation and control during the growth process.

[0019] 4. This solution utilizes a composite guide rod design, making the wire or sheet growth process more stable and controllable, thereby improving production efficiency. Furthermore, the use of tungsten alloy tensile rods extends the service life of the composite guide rods, reducing the frequency of replacement and further improving production efficiency.

[0020] Furthermore, a processing box is provided outside the crucible, and an adjustment component for adjusting the height of the crucible is fixedly connected to the processing box, and the adjustment component signal is connected to the control panel. A connecting plate is fixedly connected to the bottom of the processing box, and a support seat is fixedly connected to the bottom of the connecting plate. A conveying component for conveying composite lead rods is fixedly connected to the support seat, and a clamping component for clamping the composite lead rod is fixedly connected to the clamping rollers. The clamping component is slidably connected to one side of the connecting plate, and the conveying component, clamping roller and clamping component are all connected to the control panel signal.

[0021] Beneficial effects: By adjusting the components, the position of the crucible in the processing box can be precisely controlled, which is crucial for the micro-pull-down method of growing precious metal fine wires and sheets, because the height of the crucible position directly affects the growth rate and quality of the wire or sheet. Precise adjustment can ensure that the wire or sheet is grown under optimal conditions, thereby improving product quality; the conveying component is responsible for automatically conveying the composite guide rod into the processing box and connecting it to the control panel signal to achieve automated control; the design of the clamping roller and clamping component enables the composite guide rod to remain stably clamped during the growth process and to achieve uniform rotation through the rotating component. This design helps the wire or sheet to maintain uniform force during the stretching process, avoiding wire or sheet defects caused by uneven force. At the same time, uniform rotation can also ensure the stable growth rate of the wire or sheet, further improving product quality; since the device adopts automated control and precise adjustment technology, the growth process of the wire and sheet is more stable and controllable, thereby improving production efficiency. At the same time, through optimized design and precise control, it can also reduce raw material waste and energy consumption, further reducing costs.

[0022] Furthermore, the conveying assembly includes a conveying disc and a drive box fixedly connected to the top of the support seat, the conveying disc is rotatably connected to the top of the drive box, the drive box is fixedly connected to the bottom of the connecting plate, a connecting ring is fixedly connected to the side of the conveying disc close to the drive box, a first servo motor is fixedly connected to the inner bottom wall of the drive box, a connecting rod is coaxially fixedly connected to the output shaft of the first servo motor, an end of the connecting rod away from the first servo motor is fixedly connected to the connecting ring, and the first servo motor is connected to the control panel signal.

[0023] Beneficial Effect: The first servo motor can precisely control the rotation speed and direction of the conveyor disc. This automated method of conveying composite guide rods not only improves work efficiency but also reduces the complexity and errors of manual operation.

[0024] Furthermore, a number of clamping holes are opened on the conveying tray, and an RFID sensor is provided on one side of the clamping hole. The RFID sensor is connected to the control panel signal. A propulsion assembly is fixedly connected to the top of the support seat. The propulsion assembly is located below the conveying tray and is on the same vertical line as the bottom outlet of the crucible.

[0025] Beneficial effects: The composite guide rod can be stably clamped through the clamping hole on the conveying plate, and under the action of the propulsion component, it is pushed to the crucible in the processing box according to a predetermined path, which greatly improves work efficiency.

[0026] Furthermore, an electric clamping clamp whose diameter can be adjusted through a control panel is fixedly connected in the clamping hole, and the electric clamping clamp is connected to the control panel signal.

[0027] Beneficial effect: The adjustable diameter design of the electric clamp enables it to clamp composite guide rods of different sizes. By precisely adjusting the diameter of the electric clamp through the control panel, it can ensure that the composite guide rod is firmly clamped and will not fall off or shake during the transportation process, and can be accurately delivered to the clamping rollers for clamping.

[0028] Furthermore, the propulsion assembly includes a propulsion rod and a pushing box fixedly connected to the top of the support seat, a second servo motor is fixedly connected to the bottom of the pushing box, the second servo motor is connected to the control panel signal, the output shaft of the second servo motor is coaxially fixedly connected to a lead screw, a nut plate is threadedly connected to the lead screw, a number of guide rods are fixedly connected to the nut plate, the guide rods are all fixedly connected to one end of the propulsion rod, and the propulsion rod is located below the conveying plate, and the clamping holes are all located in the movement trajectory of the propulsion rod.

[0029] Beneficial Effects: Through precise control of the second servo motor, the rotation angle of the lead screw can be accurately adjusted, thereby controlling the movement distance of the nut plate on the lead screw. This precise control enables the propulsion rod to move according to the predetermined propulsion distance, meeting the demand for precise propulsion of the composite guide rod.

[0030] Furthermore, a first sliding groove is opened on the connecting plate, and the clamping assembly includes a rolling rod that slides with the first sliding groove, the clamping roller is sleeved on the rolling rod, and one end of the rolling rod close to the first sliding groove is fixedly connected to the output shaft of the electric telescopic rod, and the end of the electric telescopic rod away from the rolling rod is fixedly connected to the connecting plate, and the electric telescopic rod is connected to the control panel.

[0031] Beneficial effect: By opening a first slide groove on the connecting plate and slidingly cooperating with the rolling rod, the clamping roller and the rolling rod connected thereto can be flexibly moved in the horizontal direction. The position of the clamping roller is accurately controlled and flexibly adjusted by the electric telescopic rod to achieve clamping of the composite guide rod.

[0032] Furthermore, the adjustment component includes a fixed ring, a second symmetrically arranged slide groove is opened on the side wall of the processing box, a metal box is fixedly connected to the side of the inner wall of the processing box close to the second slide groove, and a cylinder is fixedly connected to the top wall of the metal box. The cylinder is connected to the control panel, and the cylinder output shaft passes through the bottom wall of the metal box and is fixedly connected to both ends of the fixed ring.

[0033] Beneficial effect: By connecting the cylinder to the control panel, the telescopic length of the cylinder can be precisely controlled, thereby achieving precise adjustment of the crucible position on the fixed ring, so that the bottom of the crucible can be close to the composite guide rod, and precious metal filaments or sheets can be grown through the composite guide rod.

[0034] Additional aspects and advantages of the present invention will be set forth in part in the description which follows and, in part, will be obvious from the description which follows, or may be learned by practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] Figure 1 A schematic diagram of the use of a composite guide rod according to an embodiment of the present invention for growing precious metal fine wires and thin sheets by a micro-pull-down method;

[0036] Figure 2 An enlarged schematic diagram of the solid-liquid interface between composite guide rods of an embodiment of the present invention for growing precious metal fine wires and thin sheets by micro-pull-down method;

[0037] Figure 3 Schematic diagram of the composite lead rod structure of an embodiment of the composite lead rod used for growing precious metal fine wires and thin sheets by micro-pull-down method according to the present invention;

[0038] Figure 4 This is a schematic front cross-sectional view of an apparatus for producing precious metal small-diameter wires using a micro-downdrawing method according to an embodiment of the present invention, which is a composite guide rod for growing precious metal fine wires and thin sheets using a micro-downdrawing method.

[0039] The figure marks in the drawings of the specification include: 1. crucible; 2. melt; 3. composite guide rod; 4. clamping roller; 5. meniscus; 6. solid-liquid interface; 7. traction rod; 8. resistance welding point; 9. stretching rod; 10. processing box; 11. cylinder; 12. metal box; 13. fixing ring; 14. connecting plate; 15. electric telescopic rod; 16. first slide groove; 17. rolling rod; 18. pushing box; 19. guide rod; 20. screw; 21. second servo motor; 22. first servo motor; 23. connecting rod; 24. clamping hole; 25. conveyor plate; 26. support seat. DETAILED DESCRIPTION

[0040] The technical solution of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the embodiments described are only some embodiments of the present invention, not all embodiments. All other embodiments obtained by ordinary technicians in this field based on the embodiments of the present invention without making any creative efforts shall fall within the scope of protection of the present invention.

[0041] In the description of the present invention, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings and are intended solely to facilitate and simplify the description of the present invention. They are not intended to indicate or imply that the devices or components referred to must have, be constructed, or operate in a specific orientation, and therefore should not be construed as limitations on the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0042] In the description of the present invention, it should be noted that, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "connected" should be understood in a broad sense. For example, they may refer to fixed, detachable, or integral connections; mechanical or electrical connections; direct or indirect connections through an intermediate medium; and internal communication between two components. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on the specific circumstances.

[0043] The following is further described in detail through specific implementation methods:

[0044] Example 1:

[0045] As attached Figure 1 、 Figure 2 and Figure 3 As shown: A composite lead rod for growing precious metal fine wires and thin sheets by micro-pull-down method, comprising a crucible 1, a composite lead rod 3 for growing precious metals in the crucible 1 provided on a motion track at the bottom of the crucible 1, the composite lead rod 3 comprising a pulling rod 7 and a stretching rod 9 welded in sequence from top to bottom, the pulling rod 7 being made of the same material as the target wire or sheet on which the precious metal is to be grown, the diameter or width of the pulling rod 7 and the stretching rod 9 being the same as the diameter or width of the target wire or sheet.

[0046] The lower stretching rod 9 is made of tungsten alloy and preferably has a diameter of 0.5 to 3 mm. The connection between the pulling rod 7 and the stretching rod 9 is a resistance welding point 8 . The length of the composite lead rod 3 inserted into the crucible 1 does not exceed the resistance welding point 8 .

[0047] The bottom end of the stretching rod 9 is symmetrically provided with clamping rollers 4 for clamping and pulling the composite lead rod 3 downward. The centers of the crucible 1, the composite lead rod 3 and the clamping rollers 4 are located on the same vertical line.

[0048] The total length of the composite lead rod 3 is 650 mm to 900 mm, preferably 700 mm to 850 mm, and more preferably 750 mm to 800 mm.

[0049] The length of the traction rod 7 is 110 to 160 mm, preferably 120 to 150 mm, and more preferably 130 to 140 mm.

[0050] The length of the stretching rod 9 is 500-750 mm, preferably 550-700 mm, more preferably 600-650 mm, and the melting point of the stretching rod 9 is higher than 3000°C.

[0051] The specific implementation process is as follows: build a control panel and device for producing small-diameter precious metal wires by the micro-downdraw method, keep the centers of the crucible 1, composite lead rod 3, and clamping roller 4 on the same vertical line, put precious metal material (powder, block, wire) into the crucible 1, move the composite lead rod 3 upward, and insert the upper part of the composite lead rod 3 into the melt 2 from the bottom of the crucible 1 until the pulling rod 7 passes through the bottom of the crucible 1, serving as a plug to prevent the melt 2 from flowing out, and fix the stretching rod 9 part of the composite lead rod 3 on the clamping roller 4. Taking PtIr10 as an example, place the PtIr10 alloy block material into the crucible 1, move the 2 mm diameter composite lead rod from the bottom of the crucible 1 upward to pass through the bottom of the crucible 1, and fix the lower end of the composite lead rod 3 on the clamping roller 4.

[0052] The parameters of the composite guide rod 3 are as follows: the length of the composite guide rod 3 is 760-780 mm, the upper length is 130-140 mm, and the lower length is 630-640 mm.

[0053] The temperature is raised to above 1800°C to melt the PtIr10 material. During the process of heating and melting the PtIr10 raw material in the crucible 1, a solid-liquid interface 6 of the target alloy is formed in the through hole at the bottom of the crucible 1, and there is only this solid-liquid interface 6. When the temperature of the melt 2 is higher than the melting point of the PtIr10 alloy and the melt 2 infiltrates the entire bottom of the crucible 1 and the side surface of the melt 2 is not convex, the rotation rate of the clamping roller 4 is adjusted through the control panel, and the composite guide rod 3 is pulled down along the crystal direction

[100] . The temperature near the meniscus 5 is controlled through the control panel, and the wire is grown according to the set pulling rate parameters. After the growth is completed, the temperature is lowered and the PtIr10 wire is taken out after natural self-cooling. In this process, a PtIr10 wire with a diameter less than 2 mm and a length greater than 1000 mm can be obtained in only 20 minutes.

[0054] Example 2:

[0055] The difference from Example 1 is that a control panel and device for producing thin sheets of precious metals by the micro-downdraw method are constructed, the centers of the crucible 1, the composite lead rod 3, and the clamping roller 4 are kept on the same vertical line, the PdIr18 alloy block material is placed in the crucible 1, and the composite lead rod 3 with a width of 10 mm and a thickness of 2 mm is moved from the bottom of the crucible 1 to the top and inserted through the bottom of the crucible 1 until the traction rod 7 passes through the bottom of the crucible 1, and the lower end of the composite lead rod 3 is fixed on the clamping roller 4.

[0056] Among them, the parameters of the composite guide rod 3 are: guide rod length 760-780 mm, upper length 130-140 mm, and lower length 630-640 mm.

[0057] The temperature is raised to above 1600℃ to melt the PdIr18 material. When the temperature of the melt 2 is higher than the melting point of the PdIr18 alloy and the melt infiltrates the entire bottom of the crucible and the side surface of the melt is not convex, the rotation rate of the clamping roller is adjusted, and the lower composite guide rod 3 along the crystal direction

[100] is controlled by the control panel. The temperature near the meniscus 5 is controlled, and the wire is grown according to the set pull-down rate parameters. After the growth is completed, the wire is cooled and naturally cooled, and then taken out to obtain the PdIr18 sheet.

[0058] In this process, PdIr18 sheets with a width of 10 mm, a thickness of less than 2 mm, and a length greater than 1000 mm can be obtained in just 20 minutes.

[0059] Example 3:

[0060] As attached Figure 4 As shown, the difference from Example 2 is that a processing box 10 is provided on the outside of the crucible 1, and an adjusting component for adjusting the height of the crucible 1 is welded inside the processing box 10, and the adjusting component signal is connected to the control panel, a connecting plate 14 is welded at the bottom of the processing box 10, and a support seat 26 is welded at the bottom of the connecting plate 14, and a conveying component for conveying the composite lead rod 3 is welded on the support seat 26, and a clamping component for clamping the composite lead rod 3 is welded on the clamping roller 4, and the clamping component is slidably connected to one side of the connecting plate 14, and the conveying component, the clamping roller 4 and the clamping component are all connected to the control panel signal.

[0061] The conveying assembly includes a conveying disc 25 and a drive box welded to the top of the support seat 26. The conveying disc 25 is rotatably connected to the top of the drive box. A connecting ring is welded on the side of the conveying disc 25 close to the drive box. The bottom wall of the drive box is bolted to the first servo motor 22. The output shaft of the first servo motor 22 is coaxially welded with a connecting rod 23. The end of the connecting rod 23 away from the first servo motor 22 is welded to the connecting ring. The first servo motor 22 is connected to the control panel signal.

[0062] A plurality of clamping holes 24 are provided on the conveying tray 25, and an RFID sensor is provided on one side of each clamping hole 24. The RFID sensor is connected to the control panel signal. A propulsion assembly is welded on the top of the support seat 26. The propulsion assembly is located below the conveying tray 25 and is located on the same vertical line as the bottom outlet of the crucible 1. An electric clamp with adjustable diameter is snap-connected in the clamping hole 24, and the electric clamp is connected to the control panel signal.

[0063] The propulsion assembly includes a propulsion rod and a push box 18 welded to the top of the support seat 26. The bottom bolt of the push box 18 is connected to the second servo motor 21. The second servo motor 21 is connected to the control panel signal. The output shaft of the second servo motor 21 is coaxially welded with a screw 20. A nut plate is threadedly connected to the screw 20. Several guide rods 19 are welded on the nut plate. The guide rods 19 are all welded to one end of the propulsion rod, and the propulsion rod is located below the conveying plate 25. The clamping holes 24 are all located in the movement trajectory of the propulsion rod.

[0064] A first slide groove 16 is formed on the connecting plate 14, and the clamping assembly includes a rolling rod 17 that slides with the first slide groove 16. The clamping roller 4 is sleeved on the rolling rod 17. One end of the rolling rod 17 close to the first slide groove 16 is welded with the output shaft of the electric telescopic rod 15, and the end of the electric telescopic rod 15 away from the rolling rod 17 is welded to the connecting plate 14. The electric telescopic rod 15 is connected to the control panel.

[0065] The adjustment component includes a fixing ring 13, and a second sliding groove is symmetrically arranged on the side wall of the processing box 10. A metal box 12 is welded on the side of the inner wall of the processing box 10 close to the second sliding groove. The inner top wall of the metal box 12 is bolted with a cylinder 11, and the cylinder 11 is connected to the control panel. The output shaft of the cylinder 11 passes through the bottom wall of the metal box 12 and is welded to both ends of the fixing ring 13.

[0066] The specific implementation process is as follows: first, the traction rods 7 of different precious metals are welded to multiple stretching rods 9, the control panel is started to open the electric clamp, and the composite lead rods 3 welded with the corresponding precious metals are placed in the clamping holes 24 of the conveyor disc 25 in turn. The RFID sensor is preset with data for each precious metal, and each conveyor disc 25 is marked with an electric clamp. Under the control of the control panel, it is adjusted to a tightening state suitable for the diameter of the composite lead rod 3. The control panel starts the first servo motor 22 to drive the conveyor disc 25 to rotate. According to the RFID sensor, the required precious metal composite lead rod 3 is rotated through the conveyor disc 25 to the bottom of the processing box 10. At this time, the control panel starts the first servo motor 22 and pushes the composite lead rod 3 upward through the connecting rod 23. At the same time, the second servo motor 21 is started to make the clamping roller 4 on the connecting plate 14 close to the composite lead rod 3 until the composite lead rod 3 is clamped.

[0067] Place the crucible 1 into the fixing ring 13, and put the target precious metal into the crucible 1. The control panel starts the cylinder 11 and pushes the fixing ring 13 until the composite lead rod 3 is located at the bottom of the crucible 1. At this time, the crucible 1 heats up to melt the precious metal material. The control panel adjusts the rotation rate of the clamping roller 4 to make the composite lead rod 3 move downward. At the same time, the control panel adjusts the height of the crucible 1 in time to maintain the stability of the liquid level of the molten metal and ensure the continuous production of wire or sheet until the finished precious metal wire or sheet is obtained.

[0068] Obviously, the above embodiments are merely examples for clarity of explanation and are not intended to limit the implementation methods. Those skilled in the art will readily appreciate that other variations or modifications based on the above descriptions are possible. It is not necessary and impossible to enumerate all implementation methods here. Obvious variations or modifications arising therefrom remain within the scope of protection of the present invention.

Claims

1. A composite lead rod for growing precious metal fine wires and thin sheets by micro-pull-down method, comprising a crucible (1), characterized in that: A composite guide rod (3) for growing the precious metal in the crucible (1) is provided on a motion track at the bottom of the crucible (1). The composite guide rod (3) comprises a traction rod (7) and a stretching rod (9) fixedly connected in sequence from top to bottom. The traction rod (7) is made of the same material as the target wire or sheet material on which the precious metal is to be grown. The diameter or width of the traction rod (7) and the stretching rod (9) are both the same as the diameter or width of the target wire or sheet material. The stretching rod (9) is made of tungsten alloy, the connection between the traction rod (7) and the stretching rod (9) is a resistance welding point (8), and the length of the composite lead rod (3) inserted into the crucible (1) does not exceed the resistance welding point (8); The bottom end of the stretching rod (9) is symmetrically provided with clamping rollers (4) for clamping and pulling the composite lead rod (3) downwards, and the centers of the crucible (1), the composite lead rod (3) and the clamping rollers (4) are located on the same vertical line.

2. The composite guide rod for growing precious metal fine wires and thin sheets by micro-pull-down method according to claim 1, characterized in that: The total length of the composite guide rod (3) is 650 mm to 900 mm; the length of the traction rod (7) is 110 to 160 mm; and the length of the stretching rod (9) is 500 to 750 mm.

3. The composite guide rod for growing precious metal fine wires and thin sheets by micro-pull-down method according to claim 2, characterized in that: The tensile rod (9) has a melting point higher than 3000°C.

4. The composite guide rod for growing precious metal fine wires and thin sheets by micro-pull-down method according to claim 3, characterized in that: A processing box (10) is provided outside the crucible (1), an adjusting component for adjusting the height of the crucible (1) is fixedly connected inside the processing box (10), and the adjusting component signal is connected to a control panel. A connecting plate (14) is fixedly connected to the bottom of the processing box (10), and a supporting seat (26) is fixedly connected to the bottom of the connecting plate (14), and a conveying component for conveying the composite lead rod (3) is fixedly connected to the supporting seat (26). A clamping component for clamping the composite lead rod (3) is fixedly connected to the clamping rollers (4), and the clamping component is slidably connected to one side of the connecting plate (14). The conveying component, the clamping rollers (4) and the clamping component are all connected to the control panel signal.

5. The composite guide rod for growing precious metal fine wires and thin sheets by micro-pull-down method according to claim 4, characterized in that: The conveying assembly comprises a conveying disc (25) and a driving box fixedly connected to the top of a support seat (26); the conveying disc (25) is rotatably connected to the top of the driving box; a connecting ring is fixedly connected to a side of the conveying disc (25) close to the driving box; a first servo motor (22) is fixedly connected to the inner bottom wall of the driving box; an output shaft of the first servo motor (22) is coaxially fixedly connected to a connecting rod (23); an end of the connecting rod (23) away from the first servo motor (22) is fixedly connected to the connecting ring; and the first servo motor (22) is connected to a control panel signal.

6. The composite guide rod for growing precious metal fine wires and thin sheets by micro-pull-down method according to claim 5, characterized in that: A plurality of clamping holes (24) are provided on the conveying tray (25), and an RFID sensor is provided on one side of the clamping hole (24). The RFID sensor is connected to a control panel signal. A propulsion assembly is fixedly connected to the top of the support seat (26). The propulsion assembly is located below the conveying tray (25) and is located on the same vertical line as the bottom outlet of the crucible (1).

7. The composite guide rod for growing precious metal fine wires and thin sheets by micro-pull-down method according to claim 6, characterized in that: An electric clamping clamp whose diameter can be adjusted by a control panel is fixedly connected in the clamping hole (24), and the electric clamping clamp is connected to the control panel signal.

8. The composite guide rod for growing precious metal fine wires and thin sheets by micro-pull-down method according to claim 7, characterized in that: The propulsion assembly comprises a propulsion rod and a propulsion box (18) fixedly connected to the top of the support seat (26); a second servo motor (21) is fixedly connected to the bottom of the propulsion box (18); the second servo motor (21) is connected to the control panel signal; the output shaft of the second servo motor (21) is coaxially fixedly connected to a lead screw (20); a nut plate is threadedly connected to the lead screw (20); a plurality of guide rods (19) are fixedly connected to the nut plate; the guide rods (19) are all fixedly connected to one end of the propulsion rod; the propulsion rod is located below the conveying plate (25); and the clamping holes (24) are all located in the motion trajectory of the propulsion rod.

9. The composite guide rod for growing precious metal fine wires and thin sheets by micro-pull-down method according to claim 8, characterized in that: A first sliding groove (16) is formed on the connecting plate (14), and the clamping assembly includes a rolling rod (17) that is slidably matched with the first sliding groove (16). The clamping roller (4) is sleeved on the rolling rod (17). One end of the rolling rod (17) close to the first sliding groove (16) is fixedly connected to the output shaft of the electric telescopic rod (15). The end of the electric telescopic rod (15) away from the rolling rod (17) is fixedly connected to the connecting plate (14). The electric telescopic rod (15) is connected to the control panel.

10. The composite guide rod for growing precious metal fine wires and thin sheets by micro-pull-down method according to claim 9, characterized in that: The adjustment component includes a fixed ring (13), a symmetrically arranged second slide groove is opened on the side wall of the processing box (10), a metal box (12) is fixedly connected to the side of the inner wall of the processing box (10) close to the second slide groove, a cylinder (11) is fixedly connected to the inner top wall of the metal box (12), the cylinder (11) is connected to the control panel, and the output shaft of the cylinder (11) passes through the bottom wall of the metal box (12) and is fixedly connected to both ends of the fixed ring (13).

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