Continuous annealing copper wire drawing machine and annealing method thereof

Abstract

The invention discloses a continuous annealing copper wire drawing machine and an annealing method thereof.The continuous annealing copper wire drawing machine comprises a wire drawing mechanism, the wire drawing mechanism comprises a die box assembly and a driving assembly, the driving assembly drives a copper wire on a winding drum to penetrate through the die box assembly, and then the diameter of the copper wire is reduced; the annealing mechanism comprises a preheating pipe, a heating pipe, an electrode wheel and a conductive pipe; the number of the electrode wheels is two, the preheating pipe is provided with pipe shells matched with the two electrode wheels respectively, the two electrode wheels are rotationally connected into the corresponding pipe shells respectively, and the two electrode wheels are electrically connected with the preheating circuit. One end of the preheating pipe is provided with a single-interface pipe joint, and the other end of the preheating pipe is communicated with one end of the heating pipe through a double-interface pipe joint. The preheating pipe and the heating pipe with extremely small internal space are adopted, so that the emptying efficiency is improved, and the defect of local blackening of monofilaments is overcome.

Description

Technical Field

[0001] The invention belongs to the technical field of copper wire production, and in particular relates to a continuous annealing copper wire drawing machine and an annealing method thereof. Background Art

[0002] The copper raw material for industrial production of wires is a copper rod of about 8 mm. The copper rod is subjected to two processes of wire drawing and annealing by a wire drawing machine to form a wire with a diameter that meets the national standard. Among them, wire drawing is to pass the thick copper rod through one or more sets of wire drawing dies under the pulling force of the driving wheel of the wire drawing machine to obtain copper wire of specified specifications. After the copper wire is plastically deformed by cold working, its internal grains are fragmented and residual internal stress exists, which has a spontaneous tendency to change to a stable state. Therefore, the copper wire after wire drawing needs to go through the annealing process of the wire drawing machine to heat the deformed copper wire, increase the kinetic energy of its atoms, and restore the metal to the level before cold working in the shortest time.

[0003] In the early days, wire drawing machines used annealing furnaces for annealing. The annealing furnaces consumed a lot of electricity, the performance of the single wires after annealing was unstable, the annealing cycle was long, the products were prone to sticking and problems with the wire release were easy to occur, and the annealing furnace annealing method has been gradually eliminated. Existing wire drawing machines mainly use online continuous drawing and annealing methods, which use multiple electrode wheels to preheat the single wires to about 250°C, and then heat them to 500-550°C for annealing. Inert gas or steam protection is introduced during the annealing process, and finally the single wire is cooled by coolant.

[0004] The above continuous annealing method has the following disadvantages:

[0005] 1. In the annealing stage:

[0006] 1. Since the current is transmitted by the brush, sparks are sometimes generated between the single wire and the electrode wheel. The instantaneous temperature generated by the spark is extremely high, which can cause the surface temperature of the copper wire to rise sharply and turn black. The spark may cause the copper atoms on the surface to be arranged disorderly, forming some tiny defects. These defective parts are more likely to absorb impurities and oxygen in the surrounding environment, further aggravating the formation of black spots. In order to avoid this problem, a protective gas is introduced into the annealing chamber or annealing box to prevent the single wire from contacting with oxygen in the air. However, the space of the existing annealing chamber is much larger than that of the electrode wheel and the single wire. Firstly, it is difficult to completely exhaust the air in the annealing box. Secondly, the concentration of the protective gas near the single wire where the electric spark is generated cannot be guaranteed. The high-temperature shock generated by the electric spark may destroy the protective effect of the protective gas in the local area. For example, the patent with application number 201610634373.3 discloses an online continuous annealing system for a fine wire drawing machine. The space of its annealing box is much larger than that of the single wire and the electrode wheel. The concentration of the protective gas near the copper wire cannot be guaranteed. Therefore, blackening defects still exist in some positions of the single wire, which cannot meet the requirements for high-quality copper material manufacturing.

[0007] 2. The annealing box is a relatively important equipment in the annealing process. The airtightness of the annealing box itself is the key factor in whether the copper wire is in direct contact with oxygen during the annealing process. After the wire drawing machine has been working for many years, the sealing of the annealing box has deteriorated. After the inert gas is introduced into the annealing box, the inside and outside of the annealing box are at normal pressure, and the oxygen in the air can easily enter the annealing box, which is also the factor that causes the copper wire to turn black during the annealing stage.

[0008] 3. The diameter of copper wire of conventional electrical appliances is 1.0-2.5 mm, except for extra-thick copper wire and extra-thin copper wire. The diameter of extra-thin copper wire is about 0.05-0.5 mm, and extra-thin copper wire is mostly used to wind small precision inductors, transformers and other electronic components. After the extra-thin copper wire is preheated and enters the annealing stage, the thin copper wire between the two electrode wheels is still melted by high temperature, that is, the wire breakage problem. After the wire is broken, the annealing box needs to be disassembled, the melted copper wire needs to be cleaned, and then the copper wire needs to be manually wound on the corresponding guide wheel or electrode wheel to resume the online annealing process.

[0009] 2. In the cooling stage:

[0010] 1. The water quality in some areas is low in pH, which washes away the antioxidant film in the original emulsified oil, resulting in a low pH value of the emulsified oil. Or the emulsified oil is not added in time, the concentration is too low, and the antioxidant content is insufficient. Especially in the summer when the temperature is high, the emulsified oil is lost faster, the fat content becomes less, and the oil temperature exceeds 45°. Smaller diameter copper wire is easily oxidized and blackened.

[0011] 2. After the copper wire passes through the cooling pool, it is necessary to use a rag, cotton cloth or wind to remove the coolant remaining on the surface, and finally wind it around the wire roller. As a post-process of the wire drawing machine, the coolant removal process cannot be cancelled so far, and there are many annealing processes. Summary of the invention

[0012] In view of the deficiencies in the prior art, the present invention provides a continuous annealing copper wire drawing machine, comprising a wire drawing mechanism, the wire drawing mechanism comprising a die box assembly and a driving assembly, the driving assembly drives the copper wire on the reel to pass through the die box assembly, thereby reducing the diameter of the copper wire; also includes an annealing mechanism, the annealing mechanism includes a preheating tube, a heating tube, an electrode wheel and a conductive tube; the electrode wheels are provided with two, the preheating tube is provided with a tube shell respectively adapted to the two electrode wheels, the two electrode wheels are respectively rotatably connected to the corresponding tube shells, and the two electrode wheels are electrically connected to the preheating circuit; one end of the preheating tube is provided with a single-interface pipe joint, and the other end of the preheating tube is connected to one end of the heating tube through a double-interface pipe joint; two conductive tubes are provided, the two conductive tubes are respectively installed on the heating tube, and the two conductive tubes are electrically connected to the heating circuit; also includes a cooling mechanism, the cooling mechanism includes a heat dissipation tube and a cooling tube; the two ends of the heat dissipation tube are respectively connected through double interfaces The pipe joint is connected with the other end of the heating tube and one end of the cooling tube, and the other end of the cooling tube is provided with a single-interface pipe joint; each single-interface pipe joint and each double-interface pipe joint include a tube body and a tube core, wherein the tube core is connected in the tube body, and the tube core is provided with an axial through hole adapted to the copper wire; the tube body of each single-interface pipe joint is provided with an air nozzle and the air nozzle is located on one side of the corresponding tube core, and the tube body of each double-interface pipe joint is provided with two air nozzles and the two air nozzles are respectively located on both sides of the corresponding tube core; the two air nozzles adjacent to the two ends of the preheating tube and the two air nozzles adjacent to the two ends of the heating tube are respectively connected with the annealing protection gas source, and the two air nozzles adjacent to the two ends of the heat dissipation tube and the two air nozzles adjacent to the two ends of the cooling tube are respectively connected with the cooling protection gas source; the copper wire passing through the mold box assembly enters from the single-interface pipe joint of the preheating tube and passes through the preheating tube, the heating tube, the heat dissipation tube and the cooling tube in sequence, and then extends out from the single-interface pipe joint of the cooling tube.

[0013] The beneficial effects of the continuous annealing copper wire drawing machine of the present invention are:

[0014] 1. Compared with the existing annealing box, it adopts preheating tube and heating tube with extremely small internal space, with high air exhaust efficiency and obvious exhaust effect.

[0015] 2. The space between the preheating tube and the heating tube is small, and the heat dissipation rate is slow, which reduces the energy consumption required for heating the copper wire.

[0016] 3. After the preheating tube and the heating tube are exhausted of air, the inside maintains positive pressure and the outside air cannot enter, creating an oxygen-free environment. At the same time, the concentration of protective gas near the copper wire is guaranteed to solve the local blackening defect of the single wire and meet the requirements of high-quality copper material manufacturing.

[0017] 4. Because the preheating tube and the heating tube adopt the protective gas positive pressure design, the sealing level requirement is not high, the corresponding manufacturing process is low in difficulty and cost, and the positive pressure design is used instead of the complex sealing structure, which is particularly suitable for the online annealing process of copper wire.

[0018] 5. Use low-temperature protective gas to cool the copper wire instead of the existing coolant, avoiding the problems of the existing emulsified oil cooling and eliminating the post-process of removing the coolant.

[0019] Preferably, the materials of the preheating tube, the heating tube and the cooling tube are all ceramic, the material of the heat dissipation tube is stainless steel, the inner diameter of the heat dissipation tube is adapted to the diameter of the copper wire, and heat dissipation fins are distributed on the outer surface of the heat dissipation tube. The heated copper wire first enters the heat dissipation tube, and the heat dissipation fins expand the heat dissipation area. The heat dissipation stage mainly uses the surrounding air to dissipate heat, reducing the energy consumption required in the cooling stage.

[0020] Preferably, the cooling mechanism further comprises a power wheel, the heat dissipation pipe is provided with a heat dissipation shell adapted to the power wheel, the power wheel is rotatably connected in the heat dissipation shell, and the copper wire of the heat dissipation pipe bypasses the power wheel. The power wheel compensates for the tension loss of the copper wire due to passing through the heat dissipation pipe, and keeps the online tension value of the copper wire constant. In addition, the heat dissipation shell further increases the heat dissipation area in the heat dissipation stage.

[0021] Preferably, the heating tube includes a left half tube and a right half tube, and both the left half tube and the right half tube are provided with axially extending sawtooth bevels, and the sawtooth bevel of the left half tube is embedded in the sawtooth bevel of the right half tube, so that the copper wire is sealed in the heating tube and the left half tube and the right half tube form a detachable connection structure. The sawtooth bevel is provided with a groove, and a sealing gasket is provided in the groove. When the left half tube and the right half tube are embedded, the two fitted sawtooth bevels squeeze the sealing gasket to form a sealing structure. On the basis of increasing the sealing area by the sawtooth bevel, the sealing effect is further improved by the sealing gasket, and both the requirements of separation and sealing are met at the same time.

[0022] Preferably, the wire drawing mechanism, annealing mechanism and cooling mechanism are all installed on the same workbench, and the workbench is provided with a separation mechanism, which includes a bracket, a motor assembly and a transmission assembly; the motor assembly is fixed to the workbench through the bracket and is located on the side of the left half-tube, and the transmission assembly is connected to the left half-tube and the right half-tube, and the transmission assembly is driven by the motor assembly to separate and combine the left half-tube and the right half-tube. The transmission assembly includes a screw and a sleeve; the sleeve is provided with two, one end of the two sleeves is respectively inserted into the side wall of the right half-tube, and the two sleeves are located at the upper and lower parts of the right half-tube, and the insertion end of each sleeve is fixedly connected to the right half-tube; the other ends of the two sleeves respectively penetrate the side wall of the left half-tube and the sleeve forms a sliding connection with the left half-tube; each sleeve is provided with a screw, and the two ends of each screw extend from the two ends of the corresponding sleeve respectively, and one end of the screw located inside the side wall of the right half-tube is rotatably connected to the right half-tube, and the other end of the screw One end is rotatably connected to the bracket, and the screw is transmission-connected to the motor assembly; a notch is provided along the axial direction of the sleeve, and a semicircular screw sleeve adapted to each screw is provided inside the side wall of the left half pipe, each semicircular screw sleeve is fixedly connected to the left half pipe, and each semicircular screw sleeve is meshed with the corresponding screw after passing through the corresponding notch, and the two screws are driven to rotate forward at the same time by the motor assembly to separate the left half pipe from the right half pipe along the direction of the sleeve, or the two screws are driven to reverse at the same time by the motor assembly to make the left half pipe fit with the right half pipe along the direction of the sleeve. The motor assembly includes a double-output shaft brake servo motor, a worm and a worm wheel; the motor housing of the double-output shaft brake servo motor is connected to the bracket through an electric slide rail, the output shafts at both ends of the double-output shaft brake servo motor are provided with coaxial fixed worms, and the ends of the two screws are provided with coaxial fixed worm wheels, and the double-output shaft brake servo motor is driven to move by the electric slide rail to make each worm mesh with the corresponding worm wheel.

[0023] Wire breakage often occurs in the heating tube, especially in the case of ultra-thin copper wire. When wire breakage occurs, the separation mechanism replaces the manual operation of splitting the heating tube, which has the following advantages:

[0024] 1. After the double-interface pipe joints at both ends of the heating tube are disassembled, the double-axis brake servo motor rotates forward. Since the semicircular screw sleeve is fixed inside the left half tube, the double-axis brake servo motor drives the screw to rotate through the worm gear. The sleeve and the screw do not move axially, the right half tube does not move, and only the semicircular screw sleeve and the left half tube move along the notch direction of the sleeve. On the contrary, the double-axis brake servo motor reverses, and the left half tube and the right half tube are embedded and sealed. The electric disassembly of the heating tube replaces the existing manual disassembly of the annealing box. The electric disassembly is fast and labor-saving.

[0025] 2. After the left half pipe is fitted with the right half pipe, the output shaft of the double-output shaft brake servo motor cannot rotate after power is cut off, and the worm drives the worm wheel in one-way transmission characteristics. The left half pipe cannot move and is tightly combined with the right half pipe. After the heating tube is split and then fitted together, it can still maintain an effective sealing state.

[0026] 3. The right half pipe is fixedly connected to the sleeve, and the screw is rotatably connected to the right pipe through a bearing. The left half pipe is sleeved on the outside of the sleeve to form a sliding connection, and the left half pipe is threadedly connected to the screw through a semicircular screw sleeve. The double coaxiality constraint of the sleeve and the screw ensures that the left half pipe and the right half pipe are always in a positive relationship during the separation and insertion process, effectively ensuring that the serrated bevel of the left half pipe and the serrated bevel of the right half pipe are accurately inserted and not misaligned, further ensuring the sealing effect.

[0027] Preferably, the inside of the tube body of the double-interface pipe joint between the heating tube and the heat dissipation tube, the inside of the tube body of the double-interface pipe joint at both ends of the cooling tube and the inside of the tube body of the single-interface pipe joint are all provided with sealing plugs, and the copper wire passes through the sealing plugs. The double-interface pipe joint itself is made of ceramic material, and the sealing plug inside it solves the problem of heat insulation between the heating stage and the heat dissipation stage, as well as the problem of low-temperature protective gas overflow. In addition, the inner side of the tube body of each double-interface pipe joint is provided with a conical groove, and the preheating tube, heating tube, heat dissipation tube and cooling tube are all provided with a conical joint adapted to the conical groove of the corresponding tube body; the tube body of each double-interface pipe joint includes an upper half pipe, a lower half pipe and a pipe clamp, and the upper half pipe and the lower half pipe are docked and locked with a pipe clamp, so that the conical joint is sealed and connected to the corresponding conical groove. After removing the pipe clamps from the double-interface pipe joints at both ends of the heating pipe, the upper and lower pipes can be easily removed to form a quick-disassembly structure. The disassembly is easy and the installation is fast. The heating pipe can be disconnected from the preheating pipe and the heat dissipation pipe in a short time without any connection with each other, thus preparing for the disassembly of the heating pipe.

[0028] The present invention also provides a copper wire annealing method, based on the above-mentioned continuous annealing copper wire drawing machine, comprising the following steps:

[0029] 1. Emptying stage of preheating tank and heating tube: The annealing protection gas source introduces protective gas with a temperature of H1 to the gas nozzle at the lower source end of the preheating tube, and discharges it from the gas nozzle at the upper source end of the preheating tube. The emptying time is not less than 1 minute. The annealing protection gas source introduces protective gas with a temperature of H2 to the gas nozzle at the lower source end of the heating tube, and discharges it from the gas nozzle at the upper source end of the heating tube. The emptying time is not less than 1 minute; H2>H1. The one-in-one-out emptying method can quickly exhaust the air inside. After 1 minute, the gas nozzles at both ends of the preheating tube and the gas nozzles at both ends of the heating tube introduce protective gas, and the air pressure in the preheating tube is maintained at P1, and the air pressure in the heating tube is maintained at P2, P2>P1. The gas nozzle at one end of the preheating tube is located in a single-interface pipe joint. The tube core inside the single-interface pipe joint is provided with a through hole for the copper wire to pass through. During the emptying stage, positive pressure is maintained in the tube body, and both air and protective gas can be discharged from the through hole of the tube core, which is beneficial to improve the emptying effect.

[0030] 2. Emptying stage of heat dissipation pipe and cooling pipe: The cooling protective gas source introduces protective gas with a temperature of L1 to the gas nozzle located at the upper source end of the heat dissipation pipe, and discharges it from the gas nozzle located at the lower source end of the heat dissipation pipe. The emptying time is not less than 1 minute. The cooling protective gas source introduces protective gas with a temperature of L2 to the gas nozzle located at the upper source end of the cooling pipe, and discharges it from the gas nozzle located at the lower source end of the cooling pipe. The emptying time is not less than 1 minute; L2<L1. Similarly, the heat dissipation pipe and cooling pipe also adopt a one-in-one-out rapid emptying method. The air exhaust efficiency and emptying effect are faster and better than the method of introducing protective gas into the annealing box.

[0031] 3. Wire drawing stage: Same as the existing wire drawing process, the copper wire on the reel passes through the mold box assembly under the pull of the driving assembly and passes through the annealing mechanism and the cooling mechanism in turn. The preheating circuit and the heating circuit are respectively connected to the set voltage and the set current.

[0032] 4. Annealing stage: The difference from the existing annealing method is that the annealing protective gas source is used to continuously inflate the preheating tube and the heating tube, so that the preheating tube and the heating tube are always in a positive pressure state, and a small amount of protective gas overflows from the single-port pipe joint at one end of the preheating tube. Air cannot enter the preheating tube and the heating tube. The copper wire in the preheating tube is heated to the set preheating temperature when the two electrode wheels are energized, and the copper wire in the heating tube is heated to the set annealing temperature when the two conductive tubes are energized.

[0033] 5. Cooling stage: Different from the existing cooling method, the cooling protection gas source keeps the cooling protection gas in the heat dissipation tube and the cooling tube in a circulating state. The copper wire passes through the heat dissipation tube, and part of the heat of the copper wire is transferred to the heat dissipation tube and the cooling protection gas in the gap between the heat dissipation tube and the copper wire. The copper wire passes through the cooling tube, and the remaining heat of the copper wire is taken away by the cooling protection gas in the cooling tube, and the annealing of the copper wire is completed. Compared with the existing method of cooling the copper wire through the coolant, the low-temperature protective gas not only protects the copper wire from local oxidation, but also saves the subsequent process of cleaning the residual coolant on the surface of the copper wire, and the need to monitor the coolant concentration in real time. The cooling method of low-temperature protective gas has obvious advantages over the cooling method of coolant.

[0034] 6. Wire breakage treatment stage: If the copper wire melts in the heating tube, the wire drawing mechanism, annealing mechanism and cooling mechanism are all suspended, the double-interface pipe joints at both ends of the heating tube are removed, the double-output shaft brake servo motor rotates forward at the same time, the worm drives the worm wheel to rotate, and the worm wheel drives the lead screw to rotate synchronously, and the reaction force of the semicircular lead screw sleeve is used to push the left half tube to move along the direction of the corresponding sleeve, and the left half tube is separated from the right half tube, and the copper wires at both ends of the melt are connected and the heating tube is cleaned. The double-output shaft brake servo motor reverses at the same time, the left half tube is reset, the left half tube and the right half tube are sealed, and the double-interface pipe joints at both ends of the heating tube are installed, and the above emptying, wire drawing, annealing and cooling operations are repeated. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0036] Figure 1 It is a structural schematic diagram of the continuous annealing copper wire drawing machine of the present invention;

[0037] Figure 2 It is a structural schematic diagram of a double-port pipe joint without a sealing plug in the present invention;

[0038] Figure 3 It is a structural schematic diagram of a double-port pipe joint with a sealing plug in the present invention;

[0039] Figure 4 It is a structural schematic diagram of a single-port pipe joint without a sealing plug in the present invention;

[0040] Figure 5 It is a structural schematic diagram of a single-port pipe joint with a sealing plug in the present invention;

[0041] Figure 6 is a cross-sectional schematic diagram of the heating tube in the present invention;

[0042] Figure 7 for Figure 6 The enlarged view of point A in the middle;

[0043] Figure 8 for Figure 6 Left view of;

[0044] Fig. 9 A schematic diagram of a bracket according to the present invention having three motor assemblies and three transmission assemblies.

[0045] Reference numerals: wire drawing mechanism 1, annealing mechanism 2, cooling mechanism 3, mold box assembly 4, driving assembly 5, preheating tube 6, heating tube 7, electrode wheel 8, conductive tube 9, electric slide rail 10, tube shell 11, single-interface pipe joint 12, double-interface pipe joint 13, left half tube 15, right half tube 16, sawtooth slope 17, sealing gasket 18, heat dissipation tube 19, cooling tube 20, tube body 21, tube core 22, air nozzle 23, power wheel 24, Heat dissipation shell 25, heat dissipation fins 26, sealing plug 27, tapered groove 28, tapered joint 29, upper half pipe 30, lower half pipe 31, pipe clamp 32, bracket 33, workbench 34, screw 35, sleeve 36, notch 37, semicircular screw sleeve 38, double-output shaft brake servo motor 39, worm 40, worm wheel 41, annealing protection gas source 42, cooling protection gas source 43, preheating circuit 44, heating circuit 45, copper wire 46. DETAILED DESCRIPTION

[0046] In view of the deficiencies in the prior art, the inventor of this case has proposed the technical solution of the present invention after long-term research and extensive practice. The following will further explain the technical solution, its implementation process and principle, etc. in conjunction with the drawings in the embodiments of this application and specific implementation cases.

[0047] It should be noted that the embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and cannot be understood as limiting the present invention. The described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments in the present invention, the present invention covers any substitution, modification, equivalent method and scheme made on the spirit, principle and scope of the present invention defined by the claims. All other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0048] In the description of this application, unless otherwise clearly specified and limited, the technical or scientific terms used should have the usual meanings understood by persons with general skills in the field to which this application belongs. Terms such as "install", "connect", and "connect" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, a conflicting connection, or an integrated connection. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0049] Embodiment 1;

[0050] like Figure 1As shown, the first embodiment provides a continuous annealing copper wire drawing machine, including a wire drawing mechanism 1, an annealing mechanism 2, a cooling mechanism 3 and a separation mechanism installed on the same workbench 34. The wire drawing mechanism 1 has the same structure as the existing wire drawing machine, and both include a die box assembly 4 and a drive assembly 5. The drive assembly 5 drives the copper wire 46 on the reel to pass through the die box assembly 4, thereby reducing the diameter of the copper wire 46. The drive assembly 5 includes a motor under the frame and a drive groove wheel above the frame. The motor drives the drive groove wheel to rotate, thereby driving the copper wire 46 to move.

[0051] like Figure 1 , Figure 2 , Figure 4 As shown, the difference from the existing wire drawing machine lies in the annealing mechanism 2, the cooling mechanism 3 and the separation mechanism, wherein the annealing mechanism 2 includes a preheating tube 6, a heating tube 7, an electrode wheel 8 and a conductive tube 9; the electrode wheels 8 are provided with two, the preheating tube 6 is provided with a tube shell 11 respectively adapted to the two electrode wheels 8, the two electrode wheels 8 are respectively rotatably connected in the corresponding tube shell 11, and the two electrode wheels 8 are electrically connected to the preheating circuit 44. One end of the preheating tube 6 is provided with a single-interface pipe joint 12, and the other end of the preheating tube 6 is connected to one end of the heating tube 7 through a double-interface pipe joint 13; the conductive tube 9 is provided with two, the two conductive tubes 9 are respectively installed on the heating tube 7, and the two conductive tubes 9 are electrically connected to the heating circuit 45.

[0052] like Figure 6 As shown, the heating tube 7 includes a left half tube 15 and a right half tube 16. The conductive tube 9 is cylindrical in shape. A through hole for the copper wire 46 to pass through is provided along the central axis of the conductive tube 9. The conductive tube 9 is made of copper or silver-clad copper with high conductivity. The copper wire 46 fully contacts the conductive tube 9 after passing through the through hole, and the resistance of the two is extremely small. After the left half tube 15 and the right half tube 16 are closed, the conductive tube 9 is clamped. There is no gap between the inner wall of the left half tube 15 and the conductive tube 9, and between the inner wall of the right half tube 16 and the conductive tube 9, so as to form a seal. In addition, the conductive tube 9 can be replaced to ensure the resistivity between the copper wire 46 and the conductive tube 9, so as to avoid electric sparks caused by increased resistance due to long use time. The left half tube 15 and the right half tube 16 are both provided with a sawtooth bevel 17 extending axially, and the sawtooth bevel 17 of the left half tube 15 is embedded in the sawtooth bevel 17 of the right half tube 16, so that the copper wire 46 is sealed in the heating tube 7 and the left half tube 15 and the right half tube 16 form a detachable connection structure. The sawtooth bevel 17 is provided with a groove, and a sealing gasket 18 is provided in the groove. When the left half tube 15 and the right half tube 16 are embedded, the two fitted sawtooth bevels 17 squeeze the sealing gasket 18 to form a sealing structure. On the basis of increasing the sealing area of ​​the sawtooth bevel 17, the sealing gasket 18 further improves the sealing effect, and both the requirements of separation and sealing are met.

[0053] like Figures 2 to 5As shown, the cooling mechanism 3 in this embodiment includes a heat dissipation pipe 19 and a cooling pipe 20, and the two ends of the heat dissipation pipe 19 are respectively connected to the other end of the heating pipe 7 and one end of the cooling pipe 20 through a double-interface pipe joint 13, and the other end of the cooling pipe 20 is provided with a single-interface pipe joint 12. Each single-interface pipe joint 12 and each double-interface pipe joint 13 includes a pipe body 21 and a pipe core 22, wherein the pipe core 22 is connected to the pipe body 21, and the pipe core 22 is provided with an axial through hole adapted to the copper wire 46; the pipe body 21 of each single-interface pipe joint 12 is provided with a gas nozzle 23, and the gas nozzle 23 is located on one side of the corresponding pipe core 22, and the pipe body 21 of each double-interface pipe joint 13 is provided with two gas nozzles 23, and the two gas nozzles 23 are respectively located on both sides of the corresponding pipe core 22; the two gas nozzles 23 adjacent to the two ends of the preheating tube 6 and the two gas nozzles 23 adjacent to the two ends of the heating tube 7 are respectively connected to the annealing protection gas source 42, and the two gas nozzles 23 adjacent to the two ends of the heat dissipation tube 19 and the two gas nozzles 23 adjacent to the two ends of the cooling tube 20 are respectively connected to the cooling protection gas source 43. The copper wire 46 passing through the mold box assembly 4 enters from the single-interface pipe joint 12 of the preheating tube 6 and passes through the preheating tube 6, the heating tube 7, the heat dissipation tube 19 and the cooling tube 20 in sequence, and then extends from the single-interface pipe joint 12 of the cooling tube 20. In addition, the cooling mechanism 3 also includes a power wheel 24, the heat dissipation tube 19 is provided with a heat dissipation shell 25 adapted to the power wheel 24, the power wheel 24 is rotatably connected in the heat dissipation shell 25, and the copper wire 46 of the heat dissipation tube 19 bypasses the power wheel 24. The power wheel 24 compensates for the tension loss of the copper wire 46 due to passing through the heat dissipation tube 19, and keeps the online tension value of the copper wire 46 constant. In addition, the heat dissipation shell 25 further increases the heat dissipation area in the heat dissipation stage.

[0054] In this embodiment, the preheating tube 6, the heating tube 7 and the cooling tube 20 are all made of ceramics, and the heat dissipation tube 19 is made of stainless steel. The inner diameter of the heat dissipation tube 19 matches the diameter of the copper wire 46, and the heat dissipation fins 26 are distributed on the outer surface of the heat dissipation tube 19. The heated copper wire 46 first enters the heat dissipation tube 19, and the heat dissipation fins 26 expand the heat dissipation area. The heat dissipation stage mainly uses the surrounding air for heat dissipation, which reduces the energy consumption required in the cooling stage. Figure 3 , Figure 5As shown, the inside of the tube body 21 of the double-interface pipe joint 13 between the heating tube 7 and the heat dissipation tube 19, the inside of the tube body 21 of the double-interface pipe joint 13 at both ends of the cooling tube 20, and the inside of the tube body 21 of the single-interface pipe joint 12 are all provided with sealing plugs 27, and the copper wire 46 passes through the sealing plugs 27. The double-interface pipe joint 13 itself is made of ceramic material, and the sealing plug 27 inside it solves the problem of heat insulation between the heating stage and the heat dissipation stage, as well as the problem of low-temperature protective gas overflow. In addition, the inner side of the tube body 21 of each double-interface pipe joint 13 is provided with a tapered groove 28, and the preheating tube 6, the heating tube 7, the heat dissipation tube 19 and the cooling tube 20 are all provided with a tapered joint 29 adapted to the tapered groove 28 of the corresponding tube body 21. The tapered groove 28 and the tapered joint 29 here both refer to a tapered cross section. The pipe body 21 of each double-interface pipe joint 13 includes an upper half pipe 30, a lower half pipe 31 and a pipe clamp 32. The upper half pipe 30 and the lower half pipe 31 are butted and locked with the pipe clamp 32, so that the tapered joint 29 is sealed and connected with the corresponding tapered groove 28. After the pipe clamp 32 is removed from the double-interface pipe joints 13 at both ends of the heating tube 7, the upper half pipe 30 and the lower half pipe 31 of the two can be easily removed, forming a quick-disassembly structure, which is easy to disassemble and quick to install. The heating tube 7 can be disconnected from the preheating tube 6 and the heat dissipation tube 19 in a short time, and they are not related to each other, so as to prepare for the disassembly of the heating tube 7.

[0055] like Figure 6 , Figure 7 and Figure 8As shown, the separation mechanism in this embodiment includes a bracket 33, a motor assembly and a transmission assembly; the motor assembly is fixed on the workbench 34 through the bracket 33 and is located on the side of the left half pipe 15, and the transmission assembly is connected to the left half pipe 15 and the right half pipe 16. The transmission assembly is driven by the motor assembly to separate and combine the left half pipe 15 and the right half pipe 16. The transmission assembly includes a screw rod 35 and a sleeve 36; the sleeve 36 is provided with two, one end of the two sleeves 36 is respectively inserted into the side wall of the right half pipe 16, and the two sleeves 36 are located at the upper and lower parts of the right half pipe 16, and the inserted end of each sleeve 36 is fixedly connected to the right half pipe 16; the other ends of the two sleeves 36 respectively penetrate the side wall of the left half pipe 15, and the sleeves 36 form a sliding connection with the left half pipe 15; each sleeve 36 is provided with a screw rod 35, and the two ends of each screw rod 35 extend from the two ends of the corresponding sleeve 36 respectively, one end of the screw rod 35 located inside the side wall of the right half pipe 16 is rotatably connected to the right half pipe 16, and the other end of the screw rod 35 is rotatably connected to the bracket 33, and the screw rod 35 is transmission-connected to the motor assembly; a notch 37 is provided along the axial direction of the sleeve 36, and a semicircular screw rod sleeve 38 adapted to each screw rod 35 is provided inside the side wall of the left half pipe 15. The semicircular screw sleeve 38 has the same structure as the half nut. Since the sleeve 36 and the left half pipe 15 slide relative to each other, a complete circular screw sleeve 35 will hinder the movement of the sleeve 36. Therefore, the design of the semicircular screw sleeve 38 and the notch 37 is adopted to avoid this problem. Each semicircular screw sleeve 38 is fixedly connected to the left half pipe 15. After each semicircular screw sleeve 38 passes through the corresponding notch 37, it meshes with the corresponding screw 35. The motor assembly drives the two screws 35 to rotate forward at the same time so that the left half pipe 15 is separated from the right half pipe 16 along the direction of the sleeve 36, or drives the two screws 35 to rotate backward at the same time through the motor assembly so that the left half pipe 15 is embedded with the right half pipe 16 along the direction of the sleeve 36. The motor assembly includes a double-output shaft brake servo motor 39, a worm 40 and a worm wheel 41; the motor housing of the double-output shaft brake servo motor 39 is connected to the bracket 33 through the electric slide rail 10, the output shafts at both ends of the double-output shaft brake servo motor 39 are provided with coaxial fixed worms 40, and the ends of the two lead screws 35 are provided with coaxial fixed worm wheels 41, and the double-output shaft brake servo motor 39 is driven by the electric slide rail 10 to move so that each worm 40 is meshed with the corresponding worm wheel 41. If the lead screw 35 at the top or the bottom of the right half pipe 16 has a slipping problem, although the output shaft of the double-output shaft brake servo motor 39 can ensure that the two lead screws 35 are driven to rotate at the same time, once one of the lead screws 35 slips, the upper and lower parts of the left half pipe 15 cannot be closed with the right half pipe 16 at the same time, a gap will appear, and it cannot be sealed.To address this problem, the double-output shaft brake servo motor 39 can separate the worm 40 at both ends of the output shaft from the corresponding worm wheel 41 through the electric slide rail 10, and then replace the lead screw 35, adjust the lead screw 35 on the upper part of the left half tube 15 to be synchronized with the lead screw 35 on the lower part, and finally reset the double-output shaft brake servo motor 39 through the electric slide rail 10, and the worm 40 engages with the corresponding worm wheel 41 to restore the synchronous movement of the upper and lower parts of the left half tube 15 without misalignment.

[0056] In addition, the length of the heating tube 7 in this embodiment is determined according to the actual annealing requirements. If the heating tube 7 is longer, it is necessary to set multiple motor assemblies and multiple transmission assemblies on the bracket 33, and all motor assemblies correspond to all transmission assemblies one by one. For example, three motor assemblies and three transmission assemblies are set, such as Fig. 9 As shown, all motor components rotate synchronously in the same direction.

[0057] For the extra-fine copper wire 46, wire breakage may occur during the annealing stage. The wire breakage problem mostly occurs in the heating tube 7. The specific operation method is: after splitting the double-interface pipe joints 13 at both ends of the heating tube 7, the double-output shaft brake servo motor 39 rotates forward. Since the semicircular screw sleeve 38 is fixed inside the left half tube 15, the double-output shaft brake servo motor 39 drives the screw 35 to rotate through the worm 40 and worm wheel 41. The sleeve 36 and the screw 35 do not move axially. The right half tube 16 is fixed together with the sleeve 36 and the bracket 33 and does not move. Only the semicircular screw sleeve 38 and the left half tube 15 move along the notch 37 of the sleeve 36. Then clean the residues in the tube caused by wire breakage, and finally connect the two ends of the fused copper wire 46. After the wire connection is completed, the double-output shaft brake servo motor 39 reverses, and the left half tube 15 and the right half tube 16 are embedded and sealed. The electric splitting of the heating tube 7 replaces the existing manual splitting of the annealing box. The electric splitting speed is fast and labor-saving.

[0058] Embodiment 2:

[0059] Embodiment 2 provides a copper wire annealing method, based on the continuous annealing copper wire drawing machine of embodiment 1, the method is as follows:

[0060] Before drawing the copper wire 46, the preheating tank and the heating tube 7 need to be emptied. The annealing protection gas source 42 introduces a protective gas with a temperature of H1 to the gas nozzle 23 located at the lower source end of the preheating tube 6, and discharges it from the gas nozzle 23 located at the upper source end of the preheating tube 6. The emptying time is not less than 1 minute. The annealing protection gas source 42 introduces a protective gas with a temperature of H2 to the gas nozzle 23 located at the lower source end of the heating tube 7, and discharges it from the gas nozzle 23 located at the upper source end of the heating tube 7. The emptying time is not less than 1 minute; H2>H1. The one-in-one-out emptying method can quickly exhaust the air inside. After 1 minute, the gas nozzles 23 at both ends of the preheating tube 6 and the gas nozzles 23 at both ends of the heating tube 7 introduce protective gas, and the air pressure in the preheating tube 6 is maintained at P1, and the air pressure in the heating tube 7 is maintained at P2, P2>P1. The gas nozzle 23 at the upper source end of the preheating tube 6 is located at the single-interface pipe joint 12. The tube core 22 inside the single-interface pipe joint 12 is provided with a through hole for the copper wire 46 to pass through. During the emptying stage, the tube body 21 maintains a positive pressure, and both air and protective gas can be discharged from the through hole of the tube core 22, which is beneficial to improving the emptying effect. It is also necessary to empty the heat dissipation tube 19 and the cooling tube 20. The cooling protective gas source 43 passes protective gas with a temperature of L1 to the gas nozzle 23 at the upper source end of the heat dissipation tube 19, and discharges it from the gas nozzle 23 at the lower source end of the heat dissipation tube 19. The emptying time is not less than 1 minute. The cooling protective gas source 43 passes protective gas with a temperature of L2 to the gas nozzle 23 at the upper source end of the cooling tube 20, and discharges it from the gas nozzle 23 at the lower source end of the cooling tube 20. The emptying time is not less than 1 minute; L2<L1. Similarly, the heat dissipation pipe 19 and the cooling pipe 20 also adopt a one-in-one-out rapid emptying method, and the air exhaust efficiency and emptying effect are faster and better than the method of introducing protective gas into the annealing box.

[0061] After emptying, wire drawing is performed again. The copper wire 46 on the reel passes through the mold box assembly 4 under the pull of the driving assembly 5, thereby changing the diameter of the copper wire 46 to a qualified diameter. Then the copper wire 46 passes through the annealing mechanism 2 and the cooling mechanism 3 in sequence, and the preheating circuit 44 and the heating circuit 45 are respectively connected to the set voltage and the set current. The annealing protection gas source 42 (the annealing protection gas source 42 is a nitrogen gas supply system or an argon gas supply system) is continuously charged into the preheating tube 6 and the heating tube 7, so that the preheating tube 6 and the heating tube 7 are always in a positive pressure state, a small amount of protective gas overflows from the single-interface pipe joint 12 at one end of the preheating tube 6, and air cannot enter the preheating tube 6 and the heating tube 7. The copper wire 46 passing through the preheating tube 6 is heated to the set preheating temperature when the two electrode wheels 8 are powered, and the copper wire 46 passing through the heating tube 7 is heated to the set annealing temperature when the two conductive tubes 9 are powered. The cooling protective gas source 43 (the annealing protective gas source 42 is the same as the cooling protective gas source 43, except that the cooling protective gas source 43 adds a refrigeration system to reduce the temperature of the normal temperature protective gas) keeps the cooling protective gas in the heat pipe 19 and the cooling pipe 20 in a circulating state respectively. The copper wire 46 passes through the heat pipe 19, and part of the heat of the copper wire 46 is transferred to the cooling protective gas in the gap between the heat pipe 19 and the copper wire 46. The copper wire 46 passes through the cooling pipe 20, and the remaining heat of the copper wire 46 is taken away by the cooling protective gas in the cooling pipe 20, and the annealing of the copper wire 46 is completed. Compared with the existing method of cooling the copper wire 46 through the coolant, the low-temperature protective gas not only protects the copper wire 46 from local oxidation, but also saves the subsequent process of cleaning the residual coolant on the surface of the copper wire 46, and the need to monitor the concentration of the coolant in real time. The cooling method of the low-temperature protective gas has obvious advantages over the cooling method of the coolant.

[0062] In the actual annealing process, wire breakage may occur during the annealing process, especially for the ultra-thin copper wire 46 with a diameter less than 0.5 mm. In order to solve this problem, if the copper wire 46 is melted in the heating tube 7, the wire drawing mechanism 1, the annealing mechanism 2 and the cooling mechanism 3 are all suspended, the double-interface pipe joints 13 at both ends of the heating tube 7 are disassembled, the double-output shaft brake servo motor 39 rotates forward at the same time, the worm 40 drives the worm wheel 41 to rotate, and the worm wheel 41 drives the screw rod 35 to rotate synchronously, and the reaction force of the semicircular screw rod sleeve 38 is used to push the left half pipe 15 to move along the direction of the corresponding sleeve 36, and the left half pipe 15 is separated from the right half pipe 16, and the melted copper wires 46 at both ends are connected and the heating tube 7 is cleaned. The double-output shaft brake servo motor 39 is reversed at the same time, the left half pipe 15 is reset, the left half pipe 15 and the right half pipe 16 are sealed, and the double-interface pipe joints 13 at both ends of the heating tube 7 are installed, and the above-mentioned emptying, wire drawing, annealing and cooling operations are repeated.

[0063] Compared with the existing annealing method, the copper wire 46 annealing method provided in this embodiment adopts low-temperature protective gas to cool the copper wire 46, replacing the existing coolant, avoiding the problems existing in the existing emulsified oil cooling, and canceling the post-process of removing the coolant on the surface of the copper wire 46. After the preheating tube 6 and the heating tube 7 are exhausted, the inside is kept at a positive pressure, and the outside air cannot enter, creating an oxygen-free environment. At the same time, the concentration of protective gas near the copper wire 46 is guaranteed, the local blackening defect of the single wire is solved, and the manufacturing requirements of high-quality copper materials are met. After the heat dissipation tube 19 and the cooling tube 20 are emptied, the internal environment of the two is sealed by the sealing plug 27 to isolate the external oxygen, and also create an oxygen-free environment, ensuring that the copper wire 46 is always in an oxygen-free space throughout the annealing process, which is particularly suitable for the annealing requirements of the ultra-fine copper wire 46.

[0064] It should be understood that the above embodiments are only for illustrating the technical concept and features of the present invention, and their purpose is to enable people familiar with this technology to understand the content of the present invention and implement it accordingly. It cannot be determined that the specific implementation of the present invention is limited to these descriptions. For ordinary technicians in the technical field to which the present invention belongs, some simple deductions or substitutions can be made without departing from the concept of the present invention. All equivalent changes or modifications made according to the spirit of the present invention should be covered within the protection scope of the present invention.

Claims

1. A continuous annealing copper wire drawing machine, comprising a wire drawing mechanism (1), wherein the wire drawing mechanism (1) comprises a die box assembly (4) and a drive assembly (5), wherein the drive assembly (5) drives a copper wire (46) on a reel to pass through the die box assembly (4), thereby reducing the diameter of the copper wire (46); Features: It also includes an annealing mechanism (2), the annealing mechanism (2) including a preheating tube (6), a heating tube (7), an electrode wheel (8) and a conductive tube (9); two electrode wheels (8) are provided, the preheating tube (6) is provided with tube shells (11) respectively adapted to the two electrode wheels (8), the two electrode wheels (8) are respectively rotatably connected to the corresponding tube shells (11), and the two electrode wheels (8) are electrically connected to the preheating circuit (44); one end of the preheating tube (6) is provided with a single-interface pipe joint (12), and the other end of the preheating tube (6) is connected to one end of the heating tube (7) through a double-interface pipe joint (13); two conductive tubes (9) are provided, the two conductive tubes (9) are respectively installed on the heating tube (7), and the two conductive tubes (9) are electrically connected to the heating circuit (45); The heat dissipation device also comprises a cooling mechanism (3), the cooling mechanism (3) comprising a heat dissipation tube (19) and a cooling tube (20); the two ends of the heat dissipation tube (19) are respectively connected to the other end of the heating tube (7) and one end of the cooling tube (20) through a double-interface pipe joint (13), and the other end of the cooling tube (20) is provided with a single-interface pipe joint (12); each single-interface pipe joint (12) and each double-interface pipe joint (13) comprises a tube body (21) and a tube core (22), wherein the tube core (22) is connected to the tube body (21), and the tube core (22) is provided with an axial through hole adapted to the copper wire (46); the tube body (21) of each single-interface pipe joint (12) is provided with an air nozzle (23), and the air nozzle (23) is located on one side of the corresponding tube core (22), and the tube body (21) of each double-interface pipe joint (13) is provided with two air nozzles (23), and the two air nozzles (23) are respectively located on both sides of the corresponding tube core (22); Two gas nozzles (23) adjacent to both ends of the preheating tube (6) and two gas nozzles (23) adjacent to both ends of the heating tube (7) are respectively connected to the annealing protection gas source (42), and two gas nozzles (23) adjacent to both ends of the heat dissipation tube (19) and two gas nozzles (23) adjacent to both ends of the cooling tube (20) are respectively connected to the cooling protection gas source (43); the copper wire (46) passing through the mold box assembly (4) enters from the single-interface pipe joint (12) of the preheating tube (6) and passes through the preheating tube (6), the heating tube (7), the heat dissipation tube (19) and the cooling tube (20) in sequence, and then extends out from the single-interface pipe joint (12) of the cooling tube (20).

2. A continuous annealing copper wire drawing machine according to claim 1, characterized in that: The materials of the preheating tube (6), the heating tube (7) and the cooling tube (20) are all ceramics, the material of the heat dissipation tube (19) is stainless steel, the inner diameter of the heat dissipation tube (19) is adapted to the diameter of the copper wire (46), and heat dissipation fins (26) are distributed on the outer surface of the heat dissipation tube (19).

3. A continuous annealing copper wire drawing machine according to claim 2, characterized in that: The cooling mechanism (3) further comprises a power wheel (24), the heat dissipation pipe (19) is provided with a heat dissipation shell (25) adapted to the power wheel (24), the power wheel (24) is rotatably connected to the heat dissipation shell (25), and the copper wire (46) of the heat dissipation pipe (19) is passed around the power wheel (24).

4. A continuous annealing copper wire drawing machine according to claim 3, characterized in that: Sealing plugs (27) are provided inside the tube body (21) of the double-interface pipe joint (13) between the heating tube (7) and the heat dissipation tube (19), inside the tube body (21) of the double-interface pipe joint (13) at both ends of the cooling tube (20), and inside the tube body (21) of the single-interface pipe joint (12), and the copper wire (46) passes through the sealing plugs (27).

5. A continuous annealing copper wire drawing machine according to claim 4, characterized in that: The heating tube (7) comprises a left half tube (15) and a right half tube (16), and the left half tube (15) and the right half tube (16) are both provided with a sawtooth inclined surface (17) extending axially, and the sawtooth inclined surface (17) of the left half tube (15) is embedded in the sawtooth inclined surface (17) of the right half tube (16), so that the copper wire (46) is sealed in the heating tube (7) and the left half tube (15) and the right half tube (16) form a detachable connection structure.

6. A continuous annealing copper wire drawing machine according to claim 5, characterized in that: The wire drawing mechanism (1), the annealing mechanism (2) and the cooling mechanism (3) are all installed on the same workbench (34). The workbench (34) is provided with a separation mechanism, which comprises a bracket (33), a motor assembly and a transmission assembly. The motor assembly is fixed to the workbench (34) through the bracket (33) and is located on the side of the left half pipe (15). The transmission assembly is connected to the left half pipe (15) and the right half pipe (16). The motor assembly drives the transmission assembly to separate and combine the left half pipe (15) and the right half pipe (16).

7. A continuous annealing copper wire drawing machine according to claim 6, characterized in that: The transmission assembly comprises a screw rod (35) and a sleeve (36); two sleeves (36) are provided, one end of the two sleeves (36) is respectively inserted into the side wall of the right half pipe (16), and the two sleeves (36) are located at the upper part and the lower part of the right half pipe (16), and the insertion end of each sleeve (36) is fixedly connected to the right half pipe (16); the other ends of the two sleeves (36) respectively penetrate the side wall of the left half pipe (15), and the sleeves (36) and the left half pipe (15) form a sliding connection; Each sleeve (36) is provided with a screw rod (35), and the two ends of each screw rod (35) extend from the two ends of the corresponding sleeve (36) respectively. One end of the screw rod (35) located inside the side wall of the right half tube (16) is rotatably connected to the right half tube (16), and the other end of the screw rod (35) is rotatably connected to the bracket (33), and the screw rod (35) is transmission-connected to the motor assembly; a notch (37) is provided along the axial direction of the sleeve (36), and a semi-grooved groove (37) adapted to each screw rod (35) is provided inside the side wall of the left half tube (15). A circular screw rod sleeve (38), each semicircular screw rod sleeve (38) is fixedly connected to the left half pipe (15), each semicircular screw rod sleeve (38) is meshed with the corresponding screw rod (35) after passing through the corresponding notch (37), and the two screw rods (35) are driven to rotate forward at the same time by the motor assembly so that the left half pipe (15) is separated from the right half pipe (16) along the direction of the sleeve (36), or the two screw rods (35) are driven to rotate backward at the same time by the motor assembly so that the left half pipe (15) is embedded with the right half pipe (16) along the direction of the sleeve (36).

8. A continuous annealing copper wire drawing machine according to claim 7, characterized in that: The motor assembly comprises a double-output shaft brake servo motor (39), a worm (40) and a worm wheel (41); the motor housing of the double-output shaft brake servo motor (39) is connected to the bracket (33) through an electric slide rail (10); the output shafts at both ends of the double-output shaft brake servo motor (39) are provided with coaxial fixed worms (40); the ends of the two lead screws (35) are provided with coaxial fixed worm wheels (41); the double-output shaft brake servo motor (39) is driven to move by the electric slide rail (10) so that each worm (40) is engaged with the corresponding worm wheel (41).

9. A continuous annealing copper wire drawing machine according to claim 8, characterized in that: The inner side of the tube body (21) of each double-interface pipe joint (13) is provided with a conical groove (28), and the preheating tube (6), the heating tube (7), the heat dissipation tube (19) and the cooling tube (20) are provided with a conical joint (29) adapted to the conical groove (28) of the corresponding tube body (21); the tube body (21) of each double-interface pipe joint (13) comprises an upper half tube (30), a lower half tube (31) and a pipe clamp (32), and the conical joint (29) is sealedly connected to the corresponding conical groove (28) by butting the upper half tube (30) and the lower half tube (31) and locking them with the pipe clamp (32).

10. A method for annealing a copper wire, characterized in that: A continuous annealing copper wire drawing machine according to claim 9, the steps are as follows: S1, the annealing protection gas source (42) introduces protection gas at a temperature of H1 into the gas nozzle (23) located at the lower source end of the preheating tube (6), and discharges it from the gas nozzle (23) located at the upper source end of the preheating tube (6), and the emptying time is not less than 1 minute; The annealing protection gas source (42) introduces protection gas at a temperature of H2 into the gas nozzle (23) located at the lower source end of the heating tube (7), and discharges the protection gas from the gas nozzle (23) located at the upper source end of the heating tube (7), and the exhaust time is not less than 1 minute; H2>H1; The cooling protection gas source (43) introduces protection gas at a temperature of L1 into the gas nozzle (23) located at the upper source end of the heat dissipation pipe (19), and discharges the protection gas from the gas nozzle (23) located at the lower source end of the heat dissipation pipe (19), and the emptying time is not less than 1 minute; The cooling protection gas source (43) introduces protection gas at a temperature of L2 into the gas nozzle (23) located at the upper source end of the cooling pipe (20), and discharges the protection gas from the gas nozzle (23) located at the lower source end of the cooling pipe (20), and the emptying time is not less than 1 minute; L2<L1; S2. After 1 minute, the protective gas is introduced through the gas nozzles (23) at both ends of the preheating tube (6) and the gas nozzles (23) at both ends of the heating tube (7), and the gas pressure in the preheating tube (6) is maintained at P1, and the gas pressure in the heating tube (7) is maintained at P2, P2>P1; S3, the copper wire (46) on the reel passes through the mold box assembly (4) and the annealing mechanism (2) and the cooling mechanism (3) under the pull of the driving assembly (5), and the preheating circuit (44) and the heating circuit (45) are respectively connected to the set voltage and the set current; S4, the annealing protection gas source (42) continuously charges the preheating tube (6) and the heating tube (7) so that the preheating tube (6) and the heating tube (7) are always in a positive pressure state, a small amount of protection gas overflows from the single-port pipe joint (12) at one end of the preheating tube (6), and air cannot enter the preheating tube (6) and the heating tube (7). The copper wire (46) in the preheating tube (6) is heated to a set preheating temperature when the two electrode wheels (8) are powered, and the copper wire (46) in the heating tube (7) is heated to a set annealing temperature when the two conductive tubes (9) are powered; S5, the cooling protection gas source (43) keeps the cooling protection gas in the heat dissipation pipe (19) and the cooling pipe (20) in a circulating state respectively, the copper wire (46) passes through the heat dissipation pipe (19), part of the heat of the copper wire (46) is transferred to the heat dissipation pipe (19) and the cooling protection gas in the gap between the heat dissipation pipe (19) and the copper wire (46), the copper wire (46) passes through the cooling pipe (20), the remaining heat of the copper wire (46) is taken away by the cooling protection gas in the cooling pipe (20), and the annealing of the copper wire (46) is completed; S6. In S4, if the copper wire (46) is melted in the heating tube (7), the wire drawing mechanism (1), the annealing mechanism (2) and the cooling mechanism (3) are all suspended, the double-interface pipe joints (13) at both ends of the heating tube (7) are disassembled, the double-output shaft brake servo motor (39) rotates forward at the same time, the worm (40) drives the worm wheel (41) to rotate, and the worm wheel (41) drives the screw (35) to rotate synchronously, and the reaction force exerted on the semicircular screw sleeve (38) is used to push the left half tube (15) to move along the direction of the corresponding sleeve (36), the left half tube (15) is separated from the right half tube (16), the melted copper wires (46) at both ends are connected and the heating tube (7) is cleaned; S7, the double-output shaft brake servo motor (39) is reversed at the same time, the left half pipe (15) is reset, the left half pipe (15) and the right half pipe (16) are sealed together, the double-interface pipe joints (13) at both ends of the heating pipe (7) are installed, and S1-S5 are repeated.

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