Composite guide rod for growing precious metal thin wires and thin sheets through micro down-draw method

Abstract

The invention relates to the technical field of crystal growth, in particular to a composite guide rod for growing precious metal thin wires and thin sheets by a micro down-draw method, which comprises a crucible and a composite guide rod positioned on a motion trail at the bottom of the crucible and used for growing precious metal in the crucible, and the composite guide rod comprises a traction rod and a stretching rod which are fixedly connected, the traction rod at the upper part is made of the same material as a target wire or sheet on which precious metal needs to grow, and the diameters or widths of the traction rod and the stretching rod are the same as those of the target wire or sheet; the lower stretching rod is made of tungsten alloy, and the joint of the traction rod and the stretching rod is a resistance welding point; clamping rollers for clamping and downwards pulling the composite guide rod are symmetrically arranged at the bottom end of the stretching rod; and the centers of the crucible, the composite guide rod and the clamping rollers are positioned on the same vertical line. The method is used for growing the small-diameter precious metal wire through the micro-extraction method, the problems existing in the existing preparation technology are solved, and the method is simple in procedure, high in production efficiency and high in applicability.

Description

Technical Field

[0001] The invention relates to the technical field of crystal growth, and 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) have high oxidation resistance, corrosion resistance, high melting point and catalytic properties, and have been used in various fields. In the automotive industry, needle-shaped iridium alloys are used as electrodes for engine spark plugs to effectively detonate gas fuels; in aerospace, PtIr alloys are used as ignition materials for aircraft engines to ensure the normal start of the engine under extreme conditions; in medical devices, precious metal wires are used to make electrode wires for pacemakers due to their excellent corrosion resistance and biocompatibility; in the energy and chemical industries, platinum wires are used to make thermocouples used at high temperatures. The stability and reliability of precious metal wires in extreme environments such as high temperature, high pressure, and strong corrosion cannot be replaced by other materials.

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

[0004] The plastic processing method of precious metal microwire drawing is constrained by the characteristics of cold processing and deformation, and it is difficult to prepare high-quality metal filaments. The application number is 201910380957.6, and the name is the preparation method of oxide-reinforced platinum-rhodium-based composite wire and the invention patent of platinum-rhodium-based composite wire. The preparation process of precious metal platinum-rhodium-based composite wire obtained by high-frequency vacuum induction melting - water-cooled copper mold casting - hot forging - vacuum annealing - extrusion - multiple drawing + annealing is disclosed, but the process is complicated, and multiple heat treatments and heat processing processes require strict control of temperature and time, require a lot of manual participation, and have certain losses.

[0005] The application number is 201810994718.5, and the name is a method for preparing a medical platinum-tungsten alloy ultrafine wire. The invention patent discloses a preparation process of platinum-tungsten alloy wire through vacuum suction casting - multiple cold rolling + annealing - multiple wire drawing + annealing, but the process requires multiple rolling and wire drawing, which is long and time-consuming. The single cold rolling annealing time can be up to 50 minutes, and the single wire drawing annealing time can be up to 20 minutes.

[0006] At present, there is no production process that can make the starting material into fibers, wires or sheets 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 molten crystal growth techniques. 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 material research.

[0007] A significant advantage of growing precious metal wires or sheets by the pull-down method is that it reduces defects such as shrinkage cavities and shrinkage, and improves 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 no technology and system that can produce precious metal small-diameter wires and thin sheets by micro-pulling, 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 under 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 lead rod needs to satisfy the condition that its upper end can be well bonded with the precious metal melt. If the upper end of the composite lead 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 lead 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, low-cost manufacturing. Summary of the invention

[0009] 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, with simple process, high production efficiency and strong applicability.

[0010] In order to achieve the above-mentioned purpose, the technical scheme of the present invention is as follows: a composite lead rod for growing precious metal fine wires and thin sheets by micro-pull-down method, comprising a crucible, a composite lead rod for growing precious metals in the crucible is arranged on a motion track at the bottom of the crucible, the composite lead rod comprises a traction rod and a stretching rod fixedly connected in sequence from top to bottom, the traction rod is made of the same material as the sheet, 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 and sheet;

[0011] The lower stretching rod is made of tungsten alloy, the connection between the traction rod and the stretching rod is a resistance welding point, and 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 downwards, 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 pulling rod is made of the same material as the target wire and has the same diameter, ensuring that only one solid-liquid interface is formed during the entire growth process. Stable control of the solid-liquid interface is crucial for the uniform growth of the wire, and can effectively avoid wire or sheet defects such as cracks and unevenness caused by interface instability.

[0017] 2. In this solution, the tensile rod is made of tungsten alloy. Compared with precious metal materials, tungsten alloy has 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. The melting point of the tensile rod made of tungsten alloy is higher than 3000℃. Even if the melting temperature reaches the melting point of the precious metal alloy, it will not melt. The composite guide rod can better withstand the 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 adopts the composite guide rod design, which makes the growth process of wire or sheet more stable and controllable, thereby improving production efficiency. At the same time, due to the use of tungsten alloy tensile rods, the service life of the composite guide rod is also extended, the frequency of replacing the composite guide rod is reduced, and the production efficiency is further improved.

[0020] Furthermore, a processing box is provided outside the crucible, and an adjusting component for adjusting the height of the crucible is fixedly connected inside the processing box, and the adjusting component signal is connected to the control panel, a connecting plate is fixedly connected to the bottom of the processing box, a supporting seat is fixedly connected to the bottom of the connecting plate, a conveying component for conveying composite lead rods is fixedly connected to the supporting seat, and a clamping component for clamping the composite lead rods is fixedly connected to the clamping rollers, and 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 accurately 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, and accurate adjustment can ensure that the wire or sheet is grown under the best growth conditions, thereby improving product quality; the conveying component is responsible for automatically conveying the composite lead rod to the processing box and connecting it to the control panel signal to achieve automatic control; the design of the clamping roller and the clamping component enables the composite lead rod to maintain stable clamping during the growth process and 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; because the device adopts automatic 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 plate and a driving box fixedly connected to the top of the support seat, the conveying plate is rotatably connected to the top of the driving box, the driving box is fixedly connected to the bottom of the connecting plate, a connecting ring is fixedly connected to one side of the conveying plate close to the driving box, a first servo motor is fixedly connected to the inner bottom wall of the driving 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 rotation speed and direction of the conveying plate can be accurately controlled by driving the first servo motor. This method of automatically conveying the composite guide rod not only improves work efficiency, but also reduces the tediousness and errors of manual operation.

[0024] Furthermore, a plurality of clamping holes are opened on the conveying plate, 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 plate 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 the 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. The diameter of the electric clamp can be precisely adjusted through the control panel to ensure that the composite guide rod is firmly clamped and will not fall off or shake during transportation, 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 second servo motor output shaft 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, 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 effect: Through the precise control of the second servo motor, the rotation angle of the lead screw can be accurately adjusted, thereby controlling the moving 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 need 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, and the clamping roller is sleeved on the rolling rod. 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 flexibly move 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 slide groove is symmetrically arranged on the side wall of the processing box, a metal box is fixedly connected to the inner wall of the processing box close to the second slide groove, 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: Through the connection between the cylinder and the control panel, the telescopic length of the cylinder can be accurately controlled, thereby realizing the precise adjustment of the position of the crucible on the fixed ring, so that the bottom of the crucible can be close to the composite guide rod, and the precious metal filaments or sheets can be grown through the composite guide rod.

[0034] 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

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

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

[0037] Figure 3 A 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 The present invention is a schematic front cross-sectional view of a device for producing precious metal small-diameter wires by micro-down drawing according to an embodiment of the composite guide rod used for growing precious metal fine wires and thin sheets by micro-down drawing.

[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 disc; 26. support seat. DETAILED DESCRIPTION

[0040] 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.

[0041] 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.

[0042] 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.

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

[0044] Embodiment 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 a micro-pull-down method, comprising a crucible 1, a composite lead rod 3 for growing precious metals in the crucible 1 is provided on a motion track at the bottom of the crucible 1, the composite lead rod 3 comprises a traction rod 7 and a stretching rod 9 welded in sequence from top to bottom, the traction rod 7 is made of the same material as the target wire or sheet on which the precious metal needs to be grown, and the diameter or width of the traction rod 7 and the stretching rod 9 are the same as the diameter or width of the target wire and sheet.

[0046] The lower stretching rod 9 is made of tungsten alloy, and its diameter is preferably 0.5-3 mm. The connection between the traction 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 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.

[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 to 750 mm, preferably 550 to 700 mm, and more preferably 600 to 650 mm. 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-down-drawing method, keep the centers of the crucible 1, the composite lead rod 3, and the clamping roller 4 on the same vertical line, load the precious metal material (powder, block, or wire) into the crucible 1, move the composite lead rod 3 upward, 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, and serve 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, put 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] Among them, the parameters of the composite guide rod 3 are: 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. In 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 lead 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 pull-down rate parameter. After the growth is completed, the temperature is lowered by program and naturally cooled, and then the PtIr10 wire is taken out. 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] Embodiment 2:

[0055] The difference from Example 1 is that a control panel and device for producing thin-thickness sheets of precious metals by the micro-down-pull method are built, 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 pass through the bottom of the crucible 1 and inserted 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: the guide rod length is 760-780 mm, the upper length is 130-140 mm, and the lower length is 630-640 mm.

[0057] The temperature is raised to above 1600°C 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 temperature near the meniscus 5 is controlled by the control panel along the lower composite guide rod 3 in the crystal direction

[100] . The wire is grown according to the set pull-down rate parameters. After the growth is completed, the wire is cooled by program 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 of more than 1000 mm can be obtained in just 20 minutes.

[0059] Embodiment 3:

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

[0061] The conveying assembly includes a conveying disc 25 and a driving box welded to the top of a supporting seat 26. The conveying disc 25 is rotatably connected to the top of the driving box. A connecting ring is welded to the side of the conveying disc 25 close to the driving box. The inner bottom wall of the driving box is bolted to a first servo motor 22. A connecting rod 23 is coaxially welded to the output shaft of the first servo motor 22. An 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 plate 25, and an RFID sensor is provided on one side of the clamping hole 24, and the RFID sensor is connected to the control panel signal. A propulsion assembly is welded on the top of the support seat 26, and the propulsion assembly is located below the conveying plate 25 and is located on the same vertical line as the bottom outlet of the crucible 1. An electric clamping clamp with adjustable diameter is snap-connected in the clamping hole 24, and the electric clamping 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 a support seat 26. A second servo motor 21 is bolted to the bottom of the push box 18. The second servo motor 21 is connected to the control panel signal. A lead screw 20 is coaxially welded to the output shaft of the second servo motor 21. A nut plate is threadedly connected to the lead screw 20. A plurality of guide rods 19 are welded to 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 motion 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. The output shaft of the electric telescopic rod 15 is welded to one end of the rolling rod 17 close to the first slide groove 16, 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 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 conveying disc 25 in turn. The RFID sensor is preset with data of each precious metal. The electric clamp marked on each conveying disc 25 is adjusted to a tightening state suitable for the diameter of the composite lead rod 3 under the control of the control panel. The control panel starts the first servo motor 22 to drive the conveying disc 25 to rotate. According to the RFID sensor, the required precious metal composite lead rod 3 is rotated through the conveying disc 25 to the bottom of the processing box 10. At this time, the control panel starts the first servo motor 22 to push 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 approach 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 move the composite lead rod 3 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 wires or sheets until the finished precious metal wires or sheets are obtained.

[0068] 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 composite lead rod for growing precious metal fine wires and thin sheets by micro-pulling 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) comprising a traction rod (7) and a stretching rod (9) which are fixedly connected in sequence from top to bottom, the traction rod (7) being made of the same material as the target wire or sheet material on which the precious metal is to be grown, and the diameter or width of the traction rod (7) and the stretching rod (9) being 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 point 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 lead 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 melting point of the tensile rod (9) is 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 adjustment component for adjusting the height of the crucible (1) is fixedly connected inside the processing box (10), and the adjustment component is signal-connected to a control panel. A connecting plate (14) is fixedly connected to the bottom of the processing box (10), and a support seat (26) is fixedly connected to the bottom of the connecting plate (14), and a conveying component for conveying a composite lead rod (3) is fixedly connected to the support 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 signal-connected to the control panel.

5. The composite lead 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 supporting 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; a connecting rod (23) is coaxially fixedly connected to the output shaft of the first servo motor (22); 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 lead 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 formed on the conveying plate (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 plate (25) and is located on the same vertical line as the bottom outlet of the crucible (1).

7. The composite lead 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 through 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 push box (18) fixedly connected to the top of a support seat (26); a second servo motor (21) is fixedly connected to the bottom of the push box (18); the second servo motor (21) is connected to a control panel signal; a lead screw (20) is coaxially fixedly connected to the output shaft of the second servo motor (21); 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 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 located in the motion trajectory of the propulsion rod.

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

10. The composite lead 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 comprises a fixing ring (13), a side wall of the processing box (10) is provided with a second sliding groove which is symmetrically arranged, a side of the inner side wall of the processing box (10) close to the second sliding groove is fixedly connected to a metal box (12), an inner top wall of the metal box (12) is fixedly connected to a cylinder (11), the cylinder (11) is connected to a control panel, and an 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 fixing ring (13).

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