A multi-compartment partition heating cold-drawing tungsten wire pre-treatment device before forming

Abstract

The application belongs to the technical field of cold drawing forming, and particularly discloses a multi-compartment partition heating cold-drawing tungsten wire forming pre-treatment equipment, which comprises a cold-drawing head, a heat preservation cavity, a heating cavity and a preheating cavity are sequentially arranged in front of the cold-drawing head, an inlet pipe is integrally fixed to the receiving end of the heat preservation cavity, the heating cavity and the preheating cavity, a discharge pipe is integrally fixed to the discharge end of the heat preservation cavity, the heating cavity and the preheating cavity, a preheating conical pipe is fixed to the inner wall of the preheating cavity between the inlet pipe and the discharge pipe, a heating conical pipe is fixed to the inner wall of the heating cavity between the inlet pipe and the discharge pipe, the large-opening end of the preheating conical pipe is communicated with the inner cavity of the inlet pipe, the large-opening end of the heating conical pipe is communicated with the inner cavity of the discharge pipe, and the inner wall of the preheating conical pipe is fixed with preheating rings at equal intervals. The tungsten wire is uniformly heated in a step-by-step manner through the conical pipe structure, the surface friction damage is reduced by cooperating with rolling support, and the residual heat is conducted to the cold-drawing head by using the heat collecting ring, so that the plasticity and the cold-drawing forming quality of the tungsten wire are improved as a whole.

Description

Technical Field

[0001] This invention belongs to the field of cold drawing forming technology, and specifically discloses a pretreatment device for cold-drawn tungsten wire forming with multi-compartment zone heating. Background Technology

[0002] In the field of cold drawing of metal wires, especially difficult-to-deform metals (such as tungsten wire), the preheating treatment of the wire before it enters the cold drawing die is a key step that determines the forming quality, product performance, and yield. Due to its high melting point, high hardness, and low plasticity, tungsten wire is prone to cracking, breakage, or internal damage when cold-drawn directly at room temperature. Therefore, it is crucial to precisely and uniformly heat it before cold drawing to improve its plasticity.

[0003] Currently, existing tungsten wire cold drawing preheating equipment and methods mainly suffer from the following technical shortcomings:

[0004] 1. Single heating method and uneven heating: Traditional equipment often uses a single constant-temperature heating chamber to heat the tungsten wire as a whole. As the tungsten wire moves continuously and rapidly in the chamber, it is difficult for its surface and core, as well as different sections in the direction of travel, to receive consistent heat input. This easily leads to temperature gradients of "external heat and internal cold" or "front heat and back cold", resulting in uneven plasticity of the tungsten wire and affecting the diameter uniformity and surface quality after cold drawing.

[0005] 2. Unreasonable heat field distribution, easily causing localized overheating: The existing heating cavity has a simple internal structure and lacks effective heat distribution guidance. During continuous heating, heat tends to accumulate at the inlet and outlet ends of the cavity, forming localized high-temperature zones. When the tungsten filament passes through these areas, the material structure may deteriorate or the surface may oxidize due to the rapid instantaneous temperature rise, thus reducing its machinability.

[0006] 3. High heat loss and poor insulation: The transition section between the heating chamber and the cold drawing die usually lacks effective insulation or heat compensation design. Before entering the cold drawing die, the heated tungsten wire loses heat rapidly to the surrounding environment, causing a sudden drop in temperature. This reduces the plasticity of the tungsten wire, directly increasing the risk of breakage and the required drawing force during cold drawing.

[0007] 4. Surface damage due to contact friction during wire operation: In long heating chambers or connecting pipes, the heated softened tungsten wire is prone to contact and friction with the inner wall of the channel, causing surface scratches, burrs, or even material defects. These surface defects will become stress concentration points during subsequent cold drawing, which can easily lead to fracture and seriously restrict the mechanical properties and application reliability of the finished wire.

[0008] 5. Temperature interference between heating zones makes process control difficult: If different functional cavities such as preheating, heating, and heat preservation are only connected by simple pipes, their internal thermal fields will affect each other through thermal radiation and air convection, making it difficult to establish and maintain a stable stepped temperature gradient. This makes the adjustment of process parameters complex and has poor repeatability, making it difficult to meet the requirements of precise temperature control curves for different specifications of tungsten wires.

[0009] In summary, in view of the problems of uneven heating, local overheating, poor heat preservation, friction damage and temperature interference in the existing preheating treatment equipment for tungsten wire cold drawing, there is an urgent need to provide a new type of treatment equipment that can achieve step-by-step, uniform and stable heating of tungsten wire before cold drawing and reduce heat damage and friction, thereby significantly improving the plasticity of tungsten wire and the quality of cold-drawn finished products. Summary of the Invention

[0010] In view of this, the purpose of this invention is to provide a pretreatment device for cold-drawn tungsten wire forming with multi-compartment zone heating, so as to solve the problems mentioned above.

[0011] To achieve the above objectives, the present invention provides a pretreatment device for cold-drawn tungsten wire forming with multi-compartment zone heating, including a cold drawing head, in which a heat preservation chamber, a heating chamber and a preheating chamber are sequentially distributed in front of the cold drawing head, an inlet pipe is integrally fixed at the receiving end of the heat preservation chamber, the heating chamber and the preheating chamber, and an outlet pipe is integrally fixed at the discharge end of the heat preservation chamber, the heating chamber and the preheating chamber.

[0012] The inner wall of the preheating chamber is fixed with a preheating cone tube between the inlet pipe and the outlet pipe. The inner wall of the heating chamber is fixed with a heating cone tube between the inlet pipe and the outlet pipe. The larger opening end of the preheating cone tube is connected to the inner cavity of the inlet pipe, and the larger opening end of the heating cone tube is connected to the inner cavity of the outlet pipe. Preheating rings are fixed at equal intervals on the inner wall of the preheating cone tube, and heating rings are fixed at equal intervals on the inner wall of the heating cone tube. Both the preheating rings and the heating rings are commercially available high-frequency inductive heaters. The high-frequency inductive heaters include an induction heating coil and a power supply structure. The induction heating coil is fixed to the inner wall of the heating cone tube and the preheating cone tube. The power supply structure is an external power supply. A heat-conducting component is fixed inside the insulation chamber. The heat-conducting component is connected to a cold-drawing head. The outlet end of the cold-drawing head is connected to a cold-drawing forming device. After the heated tungsten wire passes through the cold-drawing head and enters the interior of the cold-drawing forming device, the tungsten wire can be cold-drawn and formed by the cold-drawing head.

[0013] In the above technical solution, a connecting pipe is fixed between the discharge pipe on the preheating chamber and the inlet pipe on the heating chamber, and a connecting pipe is also fixed between the discharge pipe on the heating chamber and the inlet pipe on the insulation chamber. The connecting pipe, the inlet pipe, and the discharge pipe are coaxially distributed. Support wheels are rotatably mounted on the upper and lower parts of the connecting pipe, and the support wheels are used to support the heated tungsten wire.

[0014] In the above technical solution, the upper and lower parts of the connecting tube are provided with connection holes, the support wheel rotates inside the connection holes, and the outer edges of both sides of the support wheel are provided with tapered angles to reduce the contact area between the support wheel and the tungsten wire, so as to avoid affecting the forming quality of the tungsten wire when the support wheel contacts the tungsten wire.

[0015] In the above technical solution, further, an external pipe is fixed at the upper and lower parts of the connecting pipe between the preheating chamber and the heating chamber. An exhaust hood is fixed at the discharge end of the external pipe. The external pipe and the exhaust hood are distributed inside the connecting shell. The discharge end of the exhaust hood penetrates the connecting shell. The exhaust hood is used to transfer the heat diffused by the tungsten wire to the outside.

[0016] In the above technical solution, an air inlet box is further fixed on the connecting pipe between the heating chamber and the heat preservation chamber. The air inlet box is distributed inside the connecting shell, and the air inlet end of the air inlet box is connected to an external air supply pipe.

[0017] In the above technical solution, a sealing ring is fixed at the receiving end of the connecting pipe between the heating chamber and the heat preservation chamber. A second air blowing chamber is fixed to the discharge pipe on the heating chamber. A first air blowing chamber is fixed to the inlet pipe on the preheating chamber. Both the first air blowing chamber and the second air blowing chamber are annular cavities. Air blowing pipes are arranged at equal intervals on the annular cavities. The air blowing pipes are opposite to the outer wall of the tungsten wire.

[0018] In the above technical solution, the heat-conducting component further includes a heat-collecting ring fixed inside the insulation cavity between the inlet pipe and the outlet pipe. The end of the heat-collecting ring with a large opening is connected to the inlet pipe, and the end of the heat-collecting ring with a small opening is fixed with a heat-conducting ring. The heat-conducting ring is connected to the cold-pull head.

[0019] In the above technical solution, the discharge end of the cold drawing head is further connected to the heat-conducting ring of the cold drawing forming equipment, which transfers the heat on the heat collection ring to the cold drawing head.

[0020] Compared with the prior art, the present invention has the following beneficial effects:

[0021] 1. This invention establishes a preheating chamber, a heating chamber, and a heat-preserving chamber connected in sequence. A preheating cone tube with a large opening connected to an inlet pipe is fixed to the inner wall of the preheating chamber; a heating cone tube with a large opening connected to an outlet pipe is fixed to the inner wall of the heating chamber; and a heat-collecting ring is fixed to the inner wall of the heat-preserving chamber. This allows the tungsten wire to sequentially pass through three temperature-increasing regions—preheating, heating, and heat preservation—during its movement. The preheating cone tube diffuses heat towards the inlet end, and the heating cone tube diffuses heat towards the outlet end, thus creating a stepped temperature gradient from low to high along the direction of tungsten wire movement. This avoids material damage caused by sudden temperature changes and significantly improves the plasticity of the tungsten wire before cold drawing.

[0022] 2. In this invention, a first air-blowing chamber is fixed at the inlet pipe of the preheating chamber, and a second air-blowing chamber is fixed at the outlet pipe of the heating chamber. The inlet ends of the first and second air-blowing chambers are connected to the exhaust end of an external fan. By blowing airflow into the preheating and heating cones, a directional airflow channel is formed inside them, forcibly dispersing the local high-temperature accumulation caused by the cone structure, so that the heat in the preheating and heating cones is evenly distributed, thereby ensuring that the surface and core of the moving tungsten wire are heated evenly, and eliminating the problem of tissue deterioration caused by local overheating.

[0023] 3. This invention features connecting holes at both the upper and lower parts of the connecting tube, with support wheels rotatably mounted within these holes. The outer edges of the support wheels have tapered angles, and the length of the connecting hole is greater than the diameter of the support wheel. When the tungsten wire passes through the connecting tube, the support wheel and the tungsten wire form a rolling contact, providing effective support and preventing the tungsten wire from sagging and sliding against the tube wall due to its own weight or thermal softening. This structure significantly reduces scratches, burrs, and other defects on the surface of the tungsten wire, improving the surface quality and yield after cold drawing.

[0024] 4. This invention incorporates a heat-collecting ring and an integrally fixed heat-conducting ring inside the insulation cavity, with the heat-conducting ring connected to the cold-drawing head. When the heated tungsten wire passes through the heat-collecting ring, the heat it emits is absorbed by the ring and transferred to the cold-drawing head via the heat-conducting ring, thus achieving the recovery and utilization of the tungsten wire's residual heat and slowing down the cooling rate of the tungsten wire before it enters the cold-drawing forming equipment. Combined with a sealing ring on the connecting pipe between the heating cavity and the insulation cavity, this effectively reduces the reverse diffusion of heat from the insulation cavity to the heating cavity, ensuring the tungsten wire maintains a stable plastic temperature before entering the cold-drawing die and reducing the drawing force required for cold drawing.

[0025] 5. This invention, by setting a connecting shell outside the connecting pipe between the preheating chamber and the heating chamber, and between the heating chamber and the insulation chamber, and arranging an external pipe, an exhaust hood, and an air inlet box inside the connecting shell, can independently guide and discharge the hot airflow inside each chamber. Combined with the controllable blowing of an external fan, the temperature field distribution in the preheating chamber, heating chamber, and insulation chamber can be adjusted separately, avoiding interference from heat radiation and convection between adjacent temperature zones. This achieves precise setting and stable repeatability of the tungsten wire heating curve, adapting to the cold drawing pretreatment process requirements of wires of different specifications and materials. Attached Figure Description

[0026] Figure 1 This is a schematic diagram illustrating the usage state of the present invention;

[0027] Figure 2 This is a schematic diagram showing the distribution of the preheating cavity, heating cavity, and heat preservation cavity in this invention;

[0028] Figure 3 This is a schematic diagram showing the distribution of the preheating cone tube and the heating cone tube in this invention;

[0029] Figure 4 This is a diagram showing the connection structure between the heat collection ring and the heat insulation cavity in this invention;

[0030] Figure 5 This is a diagram showing the connection structure between the sealing ring and the connecting pipe in this invention;

[0031] Figure 6 for Figure 2 Enlarged view of A in the middle;

[0032] Figure 7 This is a structural diagram showing the connection between the first blowing chamber and the preheating chamber in this invention;

[0033] Figure 8 for Figure 2 A magnified view of B in the middle.

[0034] 1. Cold drawing forming equipment; 11. Cold drawing head; 2. Inlet pipe; 21. Preheating chamber; 22. Preheating ring; 23. Preheating cone tube; 24. Discharge pipe; 3. Protective shell; 4. First air blowing chamber; 5. Second air blowing chamber; 6. Connecting shell; 7. Heating chamber; 71. Heating cone tube; 72. Heating ring; 8. Insulation chamber; 81. Heat collecting ring; 82. Heat conducting ring; 9. Connecting pipe; 91. External pipe; 92. Support wheel; 93. Exhaust hood; 94. Sealing ring; 95. Conical angle; 96. Connecting hole; 97. Air inlet box. Detailed Implementation

[0035] To better understand the above-mentioned objectives, features, and advantages of the present invention, the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0036] Numerous specific details are set forth in the following description in order to provide a full understanding of the invention. However, the invention may also be practiced in other ways different from those described herein, and therefore the invention is not limited to the specific embodiments disclosed below.

[0037] Example 1: Please refer to Figures 1-8 As shown, the present invention provides a technical solution:

[0038] This invention is a pretreatment device for cold-drawn tungsten wire forming with multi-compartment zone heating, including a cold drawing head 11. The discharge end of the cold drawing head 11 is connected to a cold drawing forming device 1. A heat preservation chamber 8, a heating chamber 7 and a preheating chamber 21 are distributed in sequence in front of the cold drawing head 11. An inlet pipe 2 is integrally fixed to the receiving end of the heat preservation chamber 8, the heating chamber 7 and the preheating chamber 21. An outlet pipe 24 is integrally fixed to the discharge end of the heat preservation chamber 8, the heating chamber 7 and the preheating chamber 21.

[0039] A preheating cone tube 23 is fixed to the inner wall of the preheating chamber 21 between the inlet pipe 2 and the outlet pipe 24. A heating cone tube 71 is fixed to the inner wall of the heating chamber 7 between the inlet pipe 2 and the outlet pipe 24. The larger opening end of the preheating cone tube 23 is connected to the inner cavity of the inlet pipe 2. The larger opening end of the heating cone tube 71 is connected to the inner cavity of the outlet pipe 24. Preheating rings 22 are fixed at equal intervals on the inner wall of the preheating cone tube 23. Heating rings 72 are fixed at equal intervals on the inner wall of the heating cone tube 71. A heat-conducting component is fixed inside the insulation chamber 8. The heat-conducting component is connected to the cold-drawing head 11.

[0040] A connecting pipe 9 is fixed between the discharge pipe 24 on the preheating chamber 21 and the inlet pipe 2 on the heating chamber 7. A connecting pipe 9 is also fixed between the discharge pipe 24 on the heating chamber 7 and the inlet pipe 2 on the insulation chamber 8. Support wheels 92 rotate on both the upper and lower parts of the connecting pipe 9.

[0041] The preheating chamber 21, the heating chamber 7 and the heat preservation chamber 8 are covered with protective shells 3, and the connecting pipe 9 is covered with connecting shells 6. The end of the connecting shell 6 is fixed to the protective shell 3.

[0042] The upper and lower parts of the connecting pipe 9 are provided with connection holes 96. The support wheel 92 rotates inside the connection hole 96. The outer edges of both sides of the support wheel 92 are provided with tapered angles 95. The length of the connection hole 96 is greater than the diameter of the support wheel 92.

[0043] An external pipe 91 is fixed at the upper and lower parts of the connecting pipe 9 between the preheating chamber 21 and the heating chamber 7. An exhaust hood 93 is fixed at the discharge end of the external pipe 91. The external pipe 91 and the exhaust hood 93 are distributed inside the connecting shell 6. The discharge end of the exhaust hood 93 penetrates the connecting shell 6.

[0044] In actual use, the tungsten wire to be cold-drawn is inserted into the preheating chamber 21 through the inlet pipe 2. Then, the external equipment drives the tungsten wire to be transported into the cold drawing head 11. At this time, the tungsten wire passes through the preheating chamber 21, the heating chamber 7 and the heat preservation chamber 8 in sequence. When the tungsten wire is transported from the preheating chamber 21 to the heating chamber 7, the tungsten wire will be preheated by the preheating ring 22 and then heated by the heating ring 72. This can expand the heating area of ​​the tungsten wire and also realize that the tungsten wire is heated in a stepped manner before cold drawing.

[0045] When the tungsten wire is conveyed from the inside of the preheating chamber 21 to the inside of the heating chamber 7, the tungsten wire to be cold-drawn will pass through the inside of the preheating conical tube 23 and the heating conical tube 71. Since both the preheating conical tube 23 and the heating conical tube 71 are conical tubular structures, in order to avoid heat damage to the tungsten wire to be cold-drawn and to ensure that the tungsten wire to be cold-drawn is heated in a stepped manner, the larger opening end of the preheating conical tube 23 is connected to the inlet pipe 2 of the preheating chamber 21, and the larger opening end of the heating conical tube 71 is connected to the outlet pipe of the heating chamber 7. The connection 24 allows the tungsten wire to be cold-drawn to be heated in a stepped manner when it passes through the preheating cone tube 23 and the heating cone tube 71. The heat inside the preheating cone tube 23 diffuses along the inner cavity of the preheating cone tube 23 to one end of the inlet tube 2, and the heat inside the heating cone tube 71 diffuses along the inner cavity of the heating cone tube 71 to one end of the outlet tube 24. This allows the tungsten wire to be cold-drawn to be heated in a stepped manner when it passes through the preheating cone tube 23 and the heating cone tube 71, thus improving the plasticity of the tungsten wire.

[0046] When the tungsten wire to be cold-drawn passes through the interior of the preheating chamber 21, the heating chamber 7 and the heat preservation chamber 8, the support wheel 92 can support the tungsten wire to be cold-drawn, thereby preventing the outer wall of the tungsten wire from being rubbed during heating, reducing the loss of the tungsten wire, and improving the plasticity of the tungsten wire. The end of the connecting pipe 9 that contacts the inlet pipe 2 and the outlet pipe 24 is provided with a high-temperature thermal expansion material to improve the sealing strength of the ends of the connecting pipe 9 and the inlet pipe 2 and the outlet pipe 24.

[0047] Since both the preheating cone tube 23 and the heating cone tube 71 are conical tubular structures, as the preheating ring 22 and the heating ring 72 continue to heat the tungsten wire, the end of the preheating cone tube 23 near the inlet pipe 2 and the end of the heating cone tube 71 near the outlet pipe 24 will both experience excessively high temperatures. This will cause the tungsten wire to be cold-drawn to be unstablely heated when it passes through the interior of the preheating cone tube 23 and the heating cone tube 71. To solve this problem, the following structure is proposed.

[0048] Both the preheating ring 22 and the heating ring 72 are commercially available high-frequency inductive heaters. The high-frequency inductive heater includes an induction heating coil and a power supply structure. The induction heating coil is fixed to the inner wall of the heating cone tube 71 and the preheating cone tube 23. The power supply structure is an external power supply. An electromagnetic shielding layer is provided at the connection between the induction heating coil and the heating cone tube 71 and the preheating cone tube 23 to ensure the stable operation of the induction heating coil.

[0049] Example 2: Please refer to Figures 1-8As shown, based on Embodiment 1, the present invention provides a technical solution. Unlike Embodiment 1, in this embodiment, when the tungsten wire to be cold-drawn passes through the interior of the preheating cone tube 23, the heating cone tube 71, and the heat collection ring 81, an external fan is connected to the exhaust hood 93. The exhaust end of the external fan is connected to the air inlet end of the first air blowing chamber 4 and the second air blowing chamber 5. In actual use, the first air blowing chamber 4 can blow air into the interior of the preheating cone tube 23, and the second air blowing chamber 5 can blow air into the interior of the heating cone tube 71. At this time, an airflow channel can be formed inside the preheating cone tube 23 and the heating cone tube 71, thereby achieving uniform heat distribution inside the preheating cone tube 23 and the heating cone tube 71, achieving uniform heating of the tungsten wire to be cold-drawn, and thus improving the plasticity of the tungsten wire.

[0050] An air inlet box 97 is fixed on the connecting pipe 9 between the heating chamber 7 and the heat preservation chamber 8. The air inlet box 97 is located inside the connecting shell 6. The air inlet end of the air inlet box 97 is connected to an external air supply pipe. The air inlet box 97 is connected to an external inert gas supply structure. The external inert gas can enter the interior of the connecting pipe 9 and the heat collection ring 81 through the connection hole 96, and then contact the surface of the tungsten wire, thereby protecting the tungsten wire inside the heat collection ring 81.

[0051] A sealing ring 94 is fixed at the receiving end of the connecting pipe 9 between the heating chamber 7 and the heat preservation chamber 8. The discharge pipe 24 on the heating chamber 7 is fixed with a second air blowing chamber 5. The inlet pipe 2 on the preheating chamber 21 is fixed with a first air blowing chamber 4. The air inlet ends of the first air blowing chamber 4 and the second air blowing chamber 5 are connected to the exhaust end of the external fan on the exhaust hood 93.

[0052] The heat-conducting component includes a heat-collecting ring 81 fixed inside the insulation cavity 8 between the inlet pipe 2 and the outlet pipe 24. The larger opening end of the heat-collecting ring 81 is connected to the inlet pipe 2, and the smaller opening end of the heat-collecting ring 81 is fixed with a heat-conducting ring 82. The heat-conducting ring 82 is connected to the cold-drawing head 11. Both the heat-collecting ring 81 and the heat-conducting ring 82 are made of metal materials with good thermal conductivity.

[0053] The cold drawing head 11 is connected to the cold drawing forming equipment 1 at the discharge end. The heat conduction ring 82 is fixed together with the heat collection ring 81. The heat conduction ring 82 transfers the heat on the heat collection ring 81 to the cold drawing head 11.

[0054] When the tungsten wire to be cold-drawn passes through the interior of the preheating cone tube 23, the heating cone tube 71 and the heat collection ring 81, an external fan is connected to the exhaust hood 93. The exhaust end of the external fan is connected to the air inlet end of the first air blowing chamber 4 and the second air blowing chamber 5. In actual use, the first air blowing chamber 4 can blow air into the interior of the preheating cone tube 23 and the second air blowing chamber 5 can blow air into the interior of the heating cone tube 71. At this time, an airflow channel can be formed inside the preheating cone tube 23 and the heating cone tube 71, thereby achieving uniform heat distribution inside the preheating cone tube 23 and the heating cone tube 71, achieving uniform heating of the tungsten wire to be cold-drawn, and thus improving the plasticity of the tungsten wire.

[0055] When the uniformly heated tungsten wire enters the heat collection ring 81, the sealing ring 94 can seal the gap between the tungsten wire and the connecting pipe 9. It should be noted that the inner diameter of the sealing ring 94 is slightly larger than the outer diameter of the tungsten wire. This can reduce the rate at which heat diffuses from the inside of the heat collection ring 81 into the heating cone tube 71, thereby ensuring that most of the heat of the tungsten wire is concentrated inside the heat collection ring 81, avoiding rapid cooling of the tungsten wire after heating, and thus improving the plasticity of the tungsten wire.

[0056] When the heated tungsten wire enters the heat-collecting ring 81, the heat emitted by the tungsten wire can be conducted to the heat-collecting ring 81. Subsequently, the heat-conducting ring 82 can transfer the heat on the heat-collecting ring 81 to the interior of the cold drawing head 11. Thus, when the tungsten wire is transported from the preheating chamber 21 to the cold drawing head 11, the equipment can achieve stepped heating of the tungsten wire, thereby improving the plasticity of the tungsten wire and facilitating the subsequent cold drawing process of the tungsten wire by the cold drawing forming equipment 1.

[0057] The foregoing has shown and described the basic principles, main features, and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The embodiments and descriptions in the specification are merely principles of the invention. Various changes and modifications can be made to the invention without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claimed invention.

Claims

1. A pretreatment device for cold-drawn tungsten wire forming with multi-compartment zone heating, comprising a cold-drawing head (11), characterized in that, The front of the cold-drawn head (11) is provided with a heat preservation chamber (8), a heating chamber (7) and a preheating chamber (21). The inlet pipe (2) is integrally fixed at the receiving end of the heat preservation chamber (8), the heating chamber (7) and the preheating chamber (21). The discharge pipe (24) is integrally fixed at the discharge end of the heat preservation chamber (8), the heating chamber (7) and the preheating chamber (21). The inner wall of the preheating chamber (21) is fixed with a preheating cone tube (23) between the inlet pipe (2) and the outlet pipe (24). The inner wall of the heating chamber (7) is fixed with a heating cone tube (71) between the inlet pipe (2) and the outlet pipe (24). The larger opening end of the preheating cone tube (23) is connected to the inner cavity of the inlet pipe (2). The larger opening end of the heating cone tube (71) is connected to the inner cavity of the outlet pipe (24). The inner wall of the preheating cone tube (23) is fixed with preheating rings (22) at equal intervals. The inner wall of the heating cone tube (71) is fixed with heating rings (72) at equal intervals. The heat-conducting component is fixed inside the insulation chamber (8). The heat-conducting component is connected to the cold pull head (11).

2. The pretreatment equipment for cold-drawn tungsten wire forming with multi-compartment zone heating according to claim 1, characterized in that, A connecting pipe (9) is fixed between the discharge pipe (24) on the preheating chamber (21) and the inlet pipe (2) on the heating chamber (7). A connecting pipe (9) is also fixed between the discharge pipe (24) on the heating chamber (7) and the inlet pipe (2) on the insulation chamber (8). Support wheels (92) rotate on both the upper and lower parts of the connecting pipe (9).

3. The pretreatment equipment for cold-drawn tungsten wire forming with multi-compartment zone heating according to claim 2, characterized in that, The preheating chamber (21), heating chamber (7) and heat preservation chamber (8) are covered with protective shells (3), and the connecting pipe (9) is covered with connecting shells (6). The end of the connecting shells (6) is fixed to the protective shells (3).

4. The pretreatment equipment for cold-drawn tungsten wire forming with multi-compartment zone heating according to claim 3, characterized in that, The upper and lower parts of the connecting pipe (9) are provided with connection holes (96), the support wheel (92) rotates inside the connection hole (96), the outer edges of both sides of the support wheel (92) are provided with tapered angles (95), and the length of the connection hole (96) is greater than the diameter of the support wheel (92).

5. The pretreatment equipment for cold-drawn tungsten wire forming with multi-compartment zone heating according to claim 1, characterized in that, An external pipe (91) is fixed at the upper and lower parts of the connecting pipe (9) between the preheating chamber (21) and the heating chamber (7). An exhaust hood (93) is fixed at the discharge end of the external pipe (91). The external pipe (91) and the exhaust hood (93) are distributed inside the connecting shell (6). The discharge end of the exhaust hood (93) passes through the connecting shell (6) and is connected to an external fan.

6. The pretreatment equipment for cold-drawn tungsten wire forming with multi-compartment zone heating according to claim 1, characterized in that, An air inlet box (97) is fixed on the connecting pipe (9) between the heating chamber (7) and the heat preservation chamber (8). The air inlet box (97) is located inside the connecting shell (6), and the air inlet end of the air inlet box (97) is connected to an external air supply pipe.

7. The pretreatment equipment for cold-drawn tungsten wire forming with multi-compartment zone heating according to claim 1, characterized in that, A sealing ring (94) is fixed at the receiving end of the connecting pipe (9) between the heating chamber (7) and the heat preservation chamber (8). A second air blowing chamber (5) is fixed on the discharge pipe (24) of the heating chamber (7). A first air blowing chamber (4) is fixed on the inlet pipe (2) of the preheating chamber (21). The air inlet ends of the first air blowing chamber (4) and the second air blowing chamber (5) are connected to the exhaust end of the external fan on the exhaust hood (93).

8. The pretreatment equipment for cold-drawn tungsten wire forming with multi-compartment zone heating according to claim 1, characterized in that, The heat-conducting component includes a heat-collecting ring (81) fixed inside the insulation cavity (8) between the inlet pipe (2) and the outlet pipe (24). The larger end of the heat-collecting ring (81) is connected to the inlet pipe (2), and the smaller end of the heat-collecting ring (81) is fixed with a heat-conducting ring (82). The heat-conducting ring (82) is connected to the cold-pull head (11).

9. The pretreatment equipment for cold-drawn tungsten wire forming with multi-compartment zone heating according to claim 8, characterized in that, The cold drawing head (11) is connected to a cold drawing forming device (1) at its discharge end. The heat-conducting ring (82) is fixed together with the heat-collecting ring (81). The heat-conducting ring (82) transfers the heat on the heat-collecting ring (81) to the cold drawing head (11).

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