Preparation method of high-resistance aluminum bronze wire rod for high-power industrial motor

Abstract

The application discloses a preparation method of high-resistance aluminum bronze bar for high-power industrial motor, which comprises the following steps: S1, selecting raw materials according to the mass percentage, adopting horizontal continuous casting to smelt, and obtaining CuAl10Ni5Fe4 ingot; S2, hot-rolling the CuAl10Ni5Fe4 ingot to obtain aluminum bronze profile; S3, straightening the aluminum bronze profile on a hydraulic straightening machine to obtain straightened aluminum bronze profile; S4, annealing heat treatment is conducted on the straightened aluminum bronze profile to obtain heat-treated aluminum bronze profile; and S5, mechanical processing is conducted on the heat-treated aluminum bronze profile to obtain aluminum bronze bar product. The aluminum bronze bar has the characteristics of high resistance and high strength, the high resistance value of the material can guarantee the stability of the high-power motor during start and stop, and the service life of the motor is remarkably improved.

Description

Technical Field

[0001] This invention relates to the field of motor conductor technology, specifically to a method for preparing a high-resistance aluminum bronze conductor for high-power industrial motors. Background Technology

[0002] An asynchronous motor mainly consists of a stator and a rotor. The rotor is the rotating part, and a squirrel-cage rotor is formed by copper bars and end rings in the rotor slots. The rotor structure varies depending on the performance and design of the conductor bars. This invention designs a conductor bar with high resistance value to improve the motor torque and facilitate timely start-up and shutdown.

[0003] Damage to the rotor bars and end rings during startup is typical, and the situation is more severe during stall, but this should be avoided. During motor startup, the effective current can reach 600% of the full load current, and due to the skin effect, the current first flows to the upper part of the rotor bars at zero speed, easily causing cracks in the upper part of the bars. The lifespan of the motor and its components is closely related to the number of start-stop cycles. Each startup subjectes all components to a thermal fatigue cycle, causing the rotor bars to undergo high-frequency vibration, leading to failure.

[0004] The high-resistance aluminum bronze conductor bar for high-power industrial motors designed in this invention has a high resistance value, which enables the motor to have good start-stop efficiency. At the same time, it has high strength, which can withstand the vibration during motor start-stop and operation, thereby improving the service life of the motor. Summary of the Invention

[0005] To address the aforementioned technical problems, this invention provides a method for preparing a high-resistance aluminum bronze conductor bar for high-power industrial motors.

[0006] The technical solution of this invention is: a method for preparing a high-resistance aluminum bronze conductor bar for high-power industrial motors, comprising the following steps: S1. Select raw materials according to the following mass percentages: Al: 8.5~11%, Fe: 3~5%, Ni: 4-6%, Mn≤1%, Pb≤0.05%, Si≤0.2%, Sn≤0.1%, Zn≤0.4%, Cu: balance. Use horizontal continuous casting to smelt and obtain CuAl10Ni5Fe4 ingots. S2. Hot rolling of CuAl10Ni5Fe4 ingots at a temperature of 750-850℃ yields aluminum bronze profiles. S3. Straighten the aluminum bronze profile on a hydraulic straightening machine to obtain the straightened aluminum bronze profile; S4. The straightened aluminum bronze profile is subjected to annealing heat treatment at a temperature of 650℃-750℃ and a holding time of 1-1.5h to obtain the heat-treated aluminum bronze profile. S5. The heat-treated aluminum bronze profile is machined to obtain the finished aluminum bronze guide bar.

[0007] Furthermore, in the raw materials, Cu is added by electrolytic copper plate, Al is added by pure aluminum block, Ni is added by electrolytic nickel plate, and Fe is added by industrial pure copper.

[0008] Note: By using the above method to add each raw material, the raw materials are readily available and meet the manufacturing requirements of CuAl10Ni5Fe4 ingots.

[0009] Furthermore, in the smelting process, a non-vacuum medium-frequency induction furnace is used for smelting, and the selected raw materials are added together. At the same time, a covering agent is used to protect the surface of the melt formed by the raw materials.

[0010] Explanation: The covering agent covers the surface of the melt during the smelting process, and plays a role in heat preservation, adsorbing inclusions, and preventing oxidation, thereby protecting the molten metal.

[0011] Furthermore, when horizontal continuous casting is performed after the smelting is completed, the continuous casting speed is controlled to ensure that the billet has no shrinkage cavities.

[0012] Note: By controlling the horizontal continuous casting speed to 80~100mm / min, it is possible to ensure that the billet is free of defects such as shrinkage cavities, thereby obtaining CuAl10Ni5Fe4 ingots with excellent performance.

[0013] Furthermore, the straightening ensures that the straightness is ≤1mm / m.

[0014] Note: Straightness is one of the important performance characteristics of aluminum bronze guide bars, thus ensuring that the straightness dimension of the aluminum bronze profile is qualified. The above straightness meets the manufacturing requirements of aluminum bronze guide bars.

[0015] Furthermore, the annealing heat treatment includes the following steps: 1) In the heating chamber 11 of the heating combination furnace 1, the straightened aluminum bronze profile is heated to 650℃-750℃ and held at that temperature for 1-1.5 hours. 2) After the straightened aluminum bronze profile is naturally cooled to 300℃, it is sent into the processing chamber 12 of the heating combination furnace 1. The straightened aluminum bronze profile is then immersed in activated carbon at 300℃ and kept at that temperature for 1-3 minutes. 3) Afterwards, the straightened aluminum bronze profile is raised and sprayed with a spraying liquid until its temperature drops to 250℃, then it is reheated by immersing it in an activated carbon layer at 300℃. 4) Repeat step 3) two to three times to obtain the heat-treated aluminum bronze profile.

[0016] Note: The above-mentioned annealing heat treatment is used to process aluminum bronze conductors. Activated carbon is used for absorption and repeated reheating. Under the influence of temperature and spray liquid, the aluminum bronze conductors undergo annealing heat treatment. Compared with annealing heat treatment methods such as full annealing, the above-mentioned annealing heat treatment can further improve the performance of aluminum bronze conductors.

[0017] Furthermore, steps 2) and 3) are both performed under a nitrogen protective atmosphere.

[0018] Note: Nitrogen has high stability and will not decompose or react due to changes in temperature and pressure. It is also cheaper than rare gases. Under a nitrogen protective atmosphere, oxygen can be eliminated, preventing metal elements from being oxidized at high temperatures.

[0019] Furthermore, the spray solution is composed of 10-12g copper sulfate, 1-3g copper nitrate, 15-20g ammonium sulfate, 1-5g hydroxyethyl cellulose, and 100mL deionized water; the temperature of the spray solution is 10-35℃.

[0020] Note: The spray solution formulated with the above proportions can apply the above components while cooling the aluminum bronze guide bar under high temperature contact, thereby significantly improving the treatment effect of annealing heat treatment and further improving the performance of the aluminum bronze guide bar.

[0021] Furthermore, the heating combination furnace includes a heating chamber located on the left side of the heating combination furnace, a processing chamber located on the right side of the heating combination furnace, and a heat-insulating gate for separating the heating chamber and the processing chamber. The bottom of the processing chamber is equipped with a storage bin for holding activated carbon, and the top of the processing chamber is equipped with a spraying bin for spraying liquid. The processing chamber is equipped with a lifting mechanism, which is used to control the straightened aluminum bronze profile to move up and down between the storage bin and the spraying bin. The lifting mechanism includes a vertically arranged slide rail connected at both ends to the storage bin and the spray bin, a bracket slidably connected to the slide rail, and an electric push rod that controls the bracket to move up and down on the slide rail. The electric push rod is fixedly connected to the spray bin. Two rollers are provided on the inner wall of the storage bin located on one side of the slide rail. The two rollers are symmetrically arranged about the slide rail as an axis of symmetry and are rotatably connected to the inner wall of the storage bin through a torsion spring shaft. A first pressure block is provided on the slide rail located below the bracket. Two high-temperature resistant transmission belts are connected to the first pressure block. The two high-temperature resistant transmission belts pass through the notch provided at the lower end of the slide rail and are wound and connected to the corresponding reels. The top opening of the storage bin is provided with two cover plates symmetrically arranged around the slide rail as an axis of symmetry. The high-temperature resistant transmission belt is provided with a first rack for opening the cover plates. Multiple protrusions are evenly spaced on both sides of the high-temperature resistant transmission belt. The storage bin is provided with multiple levers that slide vertically and vertically connected to the inner walls on both sides. One end of each lever corresponds to one of the protrusions, and both ends of the levers are provided with high-temperature resistant springs that connect to the inner wall of the storage bin and cooperate with the protrusions to make the levers reciprocate vertically. A first gear is rotatably mounted on the inner wall of the storage bin, meshing with the first rack. A second rack is mounted on both cover plates. A second gear is rotatably mounted on the inner wall of the storage bin, meshing with the second rack. Multiple transmission pulleys, corresponding one-to-one with the first and second gears and connected by shafts, are provided in the internal cavity of the inner wall of the storage bin. Two transmission pulleys located on the same side cover plate are connected by a belt. The diameter of the transmission pulley of the first gear is 1.5 times the diameter of the transmission pulley of the second gear. A second pressure block is provided on the slide rail above the bracket, and an airbag column is connected to the second pressure block. The airbag column is fixedly connected to the upper end of the slide rail. The top surface of the spray chamber is provided with an air inlet. The air inlet is connected to the airbag column through a pipe with a one-way valve. The bottom surface of the spray chamber is provided with a spray nozzle with a solenoid valve. The upper end of the slide rail is provided with a pressure switch that is triggered by the bracket to open the spray nozzle. The pressure switch is electrically connected to the solenoid valve.

[0022] Note: The above-described heating combination furnace simplifies the annealing heat treatment process, thereby improving production efficiency. Since multiple applications of spraying liquid and activated carbon are required, while a horizontal layout for switching between the two stages could meet production needs, it would significantly increase the floor space required. Therefore, we adopted an upper and lower layout, but the activated carbon is located below the spray liquid, which results in greater consumption of activated carbon. Through the above-mentioned component settings, the cover can be automatically closed during spraying, thereby reducing the amount of spray liquid falling into the activated carbon. At the same time, when switching between the upper and lower stages, the activated carbon can be automatically disturbed to improve the utilization rate of activated carbon. Furthermore, the electronic components used to achieve the above two functions are minimal, which can effectively reduce the possibility of equipment failure caused by high-temperature environments.

[0023] The beneficial effects of this invention are: (1) The CuAl10Ni5Fe4 aluminum bronze conductor bar prepared by the preparation method of the present invention has the characteristics of high resistance and high strength. The high resistance value of this material can ensure the stability of the start and stop of the high power motor, and the high strength can improve the large vibration during the operation and start and stop of the motor, thus significantly improving the service life of this type of motor.

[0024] (2) The aluminum bronze conductor bar prepared by the preparation method of the present invention has a high resistivity, which can enable the motor to obtain a high slip rate. It is suitable for use when starting and stopping heavy industrial motors, so that the motor runs smoothly and has a large starting torque. It can meet the design requirements of heavy industrial motors and enable the motor to obtain better performance. Attached Figure Description

[0025] Figure 1 This is a schematic diagram of the external structure of the heating combination furnace of the present invention; Figure 2 This is a schematic diagram of the internal structure of the heating combination furnace of the present invention; Figure 3 This is a schematic diagram of the assembly structure of the material storage bin and the spraying bin of the present invention; Figure 4 This is a schematic diagram of the internal structure of the storage bin of the present invention; Figure 5 This is a schematic diagram of the transmission of the first and second pressing blocks of the present invention; Figure 6 This is a schematic diagram of the structure of the cover plate of the present invention; Figure 7 This is a schematic diagram of the spray chamber structure of the present invention; Among them, 1-heating combination furnace, 11-heating chamber, 12-processing chamber, 13-heat insulation gate, 2-storage bin, 21-winding wheel, 22-cover plate, 23-lever, 24-second rack, 25-first gear, 26-second gear, 27-transmission pulley, 3-spraying chamber, 4-slide rail, 5-bracket, 6-electric push rod, 7-first pressure block, 71-high temperature resistant transmission belt, 72-first rack, 73-protrusion, 8-second pressure block, 81-airbag column, 82-push-type switch. Detailed Implementation

[0026] The present invention will now be described in more detail with reference to specific embodiments, so as to better demonstrate the advantages of the present invention.

[0027] Example 1 A method for preparing a high-resistance aluminum bronze conductor bar for high-power industrial motors includes the following steps: S1. Select the following raw materials according to the following mass percentages: Al: 10.20%, Fe: 4.98%, Ni: 4.49%, Mn: 0.097%, Pb: 0.001%, Si: 0.047%, Sn: 0.011%, Zn: 0.122%, Cu: balance. Melt the raw materials using a non-vacuum medium-frequency induction melting furnace. Add Cu using electrolytic copper plates, Al using pure aluminum blocks, Ni using electrolytic nickel plates, and Fe using industrial pure copper. Add all the selected raw materials together and use a commercially available covering agent to protect the surface of the melt formed by the raw materials. After melting, when performing horizontal continuous casting, control the casting speed to ensure that the billet has no shrinkage cavities, and obtain CuAl10Ni5Fe4 ingots. S2. Hot rolling of CuAl10Ni5Fe4 ingot at 750℃ yields aluminum bronze profiles. S3. Straighten the aluminum bronze profile on a hydraulic straightening machine, ensuring that the straightness is ≤1mm / m, to obtain the straightened aluminum bronze profile. S4. The straightened aluminum bronze profile is subjected to annealing heat treatment at a temperature of 650℃ and a holding time of 1 hour. After cooling in the furnace, the heat-treated aluminum bronze profile is obtained. S5. The heat-treated aluminum bronze profile is machined to obtain the finished aluminum bronze guide bar.

[0028] Example 2 The difference between this embodiment and Embodiment 1 is that the hot rolling temperature is 800℃; the annealing heat treatment temperature is 680℃, and the holding time is 1h.

[0029] Example 3 The difference between this embodiment and Embodiment 1 is that the hot rolling temperature is 850℃; the annealing heat treatment temperature is 700℃; and the holding time is 1h.

[0030] Example 4 The difference between this embodiment and Embodiment 1 is that the hot rolling temperature is 850℃; the annealing heat treatment temperature is 750℃, and the holding time is 1h.

[0031] To verify the performance of the aluminum bronze conductors prepared in the above embodiments, mechanical property tests were conducted on the aluminum bronze conductors of each embodiment. The results are shown in Table 1 below: Table 1 Mechanical properties of CuAl10Ni5Fe4 conductors processed by different methods

[0032] As can be seen from the data in Table 1 above, the mechanical properties of aluminum bronze conductors prepared under different processes are different. Among them, the conductivity of Examples 1 and 2 is better, while the tensile strength of Examples 3 and 4 is better. Overall, Example 2 has more comprehensive mechanical properties.

[0033] Example 5 The difference between this embodiment and Embodiment 2 lies in the method of annealing heat treatment. In this embodiment, the annealing heat treatment includes the following steps: 1) In the heating chamber of the combined heating furnace, the straightened aluminum bronze profile is heated to 680℃ and held at that temperature for 1 hour. 2) After the straightened aluminum bronze profile is naturally cooled to 300℃, it is sent into the processing chamber of the heating furnace. The straightened aluminum bronze profile is then immersed in activated carbon at 300℃ and held for 2 minutes. 3) Afterwards, the straightened aluminum bronze profile is raised and sprayed with a spraying liquid until its temperature drops to 250℃, then it is reheated by immersing it in an activated carbon layer at 300℃. 4) Repeat step 3) two to three times to obtain the heat-treated aluminum bronze profile.

[0034] Steps 2) and 3) are carried out under a nitrogen protective atmosphere; the spray solution is composed of 11g copper sulfate, 2g copper nitrate, 18g ammonium sulfate, 4g hydroxyethyl cellulose, and 100mL deionized water; the temperature of the spray solution is 25℃.

[0035] Example 6 The difference between this embodiment and embodiment 5 is that the heat preservation time is 1 minute in step 2).

[0036] Example 7 The difference between this embodiment and embodiment 5 is that the heat preservation time is 3 minutes in step 2).

[0037] Example 8 The difference between this embodiment and embodiment 5 is that the spray solution is composed of 10g copper sulfate, 1g copper nitrate, 15g ammonium sulfate, 1g hydroxyethyl cellulose, and 100mL deionized water; the temperature of the spray solution is 10℃.

[0038] Example 9 The difference between this embodiment and Embodiment 5 is that the spray solution is composed of 12g copper sulfate, 3g copper nitrate, 20g ammonium sulfate, 5g hydroxyethyl cellulose, and 100mL deionized water; the temperature of the spray solution is 35℃.

[0039] To verify the performance of the aluminum bronze conductors prepared in the above embodiments, mechanical property tests were conducted on the aluminum bronze conductors of each embodiment. Simultaneously set up Control 1 and Control 2, specifically as follows: 1) Control 1: In the heating chamber of the heating combination furnace, the straightened aluminum bronze profile was heated to 680℃ and held for 1 hour. Then, spraying liquid was sprayed until the temperature dropped to room temperature to obtain the heat-treated aluminum bronze profile. 2) Control 2: The spray solution was deionized water; The results are shown in Table 2 below: Table 2 Mechanical properties of CuAl10Ni5Fe4 conductors processed by different methods

[0040] As can be seen from the data in Table 2 above, the mechanical properties of the aluminum bronze conductor strips prepared under different annealing heat treatments are different. After the annealing heat treatment in Example 5, its conductivity was improved to a certain extent, and its tensile strength was also improved. Therefore, the annealing heat treatment in Example 5 can effectively improve the various mechanical properties of the aluminum bronze conductor strips. Meanwhile, by comparing the aluminum bronze conductors prepared in Examples 5-9, it can be found that different process parameters and spraying liquids have a certain impact on the prepared aluminum bronze conductors. Among them, the heat preservation time and spraying liquid in Example 5 are relatively optimal. Furthermore, by comparing Control 1 and Control 2, it can be seen that when the aluminum bronze conductors are cooled to room temperature by directly using the spraying liquid, the improvement on the mechanical properties of the aluminum bronze conductors is not significant. This may be due to the temperature change and the short action time of the spraying liquid. Using deionized water as the spraying liquid and treating it only by temperature change also does not significantly improve the mechanical properties of the aluminum bronze conductors.

[0041] Example 10 Based on Embodiment 5, this embodiment provides a heating combination furnace for annealing heat treatment. The heating combination furnace 1 includes a heating chamber 11 located on the left side of the heating combination furnace 1, a processing chamber 12 located on the right side of the heating combination furnace 1, and a heat-insulating gate 13 for separating the heating chamber 11 and the processing chamber 12. The bottom of the processing chamber 12 is provided with a storage bin 2 for holding activated carbon, and the top of the processing chamber 12 is provided with a spraying bin 3 for spraying spraying liquid. The processing chamber 12 is provided with a lifting mechanism, which is used to control the straightened aluminum bronze profile to move up and down between the storage bin 2 and the spraying bin 3. The lifting mechanism includes a vertically arranged slide rail 4 connected at both ends to the storage bin 2 and the spray bin 3, a bracket 5 slidably connected to the slide rail 4, and an electric push rod 6 that controls the bracket 5 to move up and down on the slide rail 4. The electric push rod 6 is fixedly connected to the spray bin 3. Two rollers 21 are provided on the inner wall of the storage bin 2 located on one side of the slide rail 4. The two rollers 21 are symmetrically arranged about the slide rail 4 as an axis of symmetry and are rotatably connected to the inner wall of the storage bin 2 through a torsion spring shaft. A first pressure block 7 is provided on the slide rail 4 located below the bracket 5. Two high-temperature resistant transmission belts 71 are connected to the first pressure block 7, and the two high-temperature resistant transmission belts 71 pass through the notch provided at the lower end of the slide rail 4 and are wound and connected to the corresponding reel 21. The top opening of the storage bin 2 is provided with two cover plates 22 symmetrically arranged with the slide rail 4 as the axis of symmetry. The high-temperature resistant transmission belt 71 is provided with a first rack 72 for opening the cover plates 22. Multiple protrusions 73 are provided at equal intervals on the high-temperature resistant transmission belt 71 located on both sides of the first rack 72. The storage bin 2 is provided with multiple levers 23 that are slidably connected to the inner walls on both sides. One end of each lever 23 is corresponding to one of the protrusions 73, and both ends of the lever 23 are provided with high-temperature resistant springs that are connected to the inner wall of the storage bin 2 and are used to cooperate with the protrusions 73 to make the lever 23 reciprocate up and down. A first gear 25 is rotatably mounted on the inner wall of the storage bin 2, meshing with the first rack 72. A second rack 24 is mounted on each of the two cover plates 22. A second gear 26 is rotatably mounted on the inner wall of the storage bin 2, meshing with the second rack 24. Multiple transmission pulleys 27, corresponding one-to-one with the first gear 25 and the second gear 26 and connected by shafts, are located in the internal cavity of the inner wall of the storage bin 2. Two transmission pulleys 27 located on the same side cover plate 22 are connected by a belt. The diameter of the transmission pulley 27 of the first gear 25 is 1.5 times the diameter of the transmission pulley 27 of the second gear 26. Both the first gear 25 and the second gear 26 located on the same side cover plate 22 are bevel gears, and they rotate in opposite directions. A second pressure block 8 is provided on the slide rail 4 located above the bracket 5. An airbag column 81 is connected to the second pressure block 8, and the airbag column 81 is fixedly connected to the upper end of the slide rail 4. An air inlet is provided on the top surface of the spray chamber 3. The air inlet is connected to the airbag column 81 through a pipe with a one-way valve. A spray nozzle with a solenoid valve is provided on the bottom surface of the spray chamber 3. A pressure switch 82 is provided on the upper end of the slide rail 4, which is triggered by the bracket 5 to open the spray nozzle. The pressure switch 82 is electrically connected to the solenoid valve.

[0042] The working method of the above-mentioned heating combination furnace is as follows: The straightened aluminum bronze profile is placed on the frame of the heating chamber 11, and then the chamber door is closed. The temperature is then raised to 680°C and kept for 1 hour. After cooling naturally to 300°C, the straightened aluminum bronze profile is connected to the bracket 5 via the track, and then the heat insulation gate 13 is closed. Under the action of the electric push rod 6, the bracket 5 moves up and down along the slide rail 4. Moving upward triggers the spray chamber 3, and moving downward triggers the storage chamber 2. The specific description is as follows: Spray chamber 3: When the bracket 5 moves upward along the slide rail 4, the second pressure block 8 squeezes the airbag column 81 and pressurizes the gas into the spray chamber 3, thus pressurizing the spray chamber 3. At the same time, the bracket 5 triggers the pressure switch 82, thereby opening the spray nozzle to spray the straightened aluminum bronze profile with spray liquid. After the temperature sensor on the bracket 5 detects that the temperature of the straightened aluminum bronze profile drops to 300℃, the electric push rod 6 drives the bracket 5 to move downward. Storage bin 2: When the support 5 moves downward along the slide rail 4, the first pressure block 7 moves downward synchronously. Under the winding of the roller 21, the high-temperature resistant transmission belt 71 is wound up, thereby utilizing the rotation of the first rack 72 and the first gear 25. Under the action of the first gear 25, the second gear 26 and the transmission pulley 27, the second gear 26 is rotated, thereby meshing with the second rack 24 to drive the cover plate 22 to move, thereby opening the cover plate 22. During the movement, the protrusion 73 of the high-temperature resistant transmission belt 71 presses the lever 23 that it passes through. Through the up and down reciprocating motion of the lever 23, the activated carbon in the storage bin 2 is stirred.

Claims

1. A method for preparing a high-resistance aluminum bronze conductor bar for a high-power industrial motor, characterized in that, Includes the following steps: S1. Select raw materials according to the following mass percentages: Al: 8.5~11%, Fe: 3~5%, Ni: 4-6%, Mn≤1%, Pb≤0.05%, Si≤0.2%, Sn≤0.1%, Zn≤0.4%, Cu: balance. Use horizontal continuous casting to smelt and obtain CuAl10Ni5Fe4 ingots. S2. Hot rolling of CuAl10Ni5Fe4 ingots at a temperature of 750-850℃ yields aluminum bronze profiles. S3. Straighten the aluminum bronze profile on a hydraulic straightening machine to obtain the straightened aluminum bronze profile; S4. The straightened aluminum bronze profile is subjected to annealing heat treatment at a temperature of 650℃-750℃ and a holding time of 1-1.5h to obtain the heat-treated aluminum bronze profile. S5. The heat-treated aluminum bronze profile is machined to obtain the finished aluminum bronze guide bar; The annealing heat treatment includes the following steps: 1) In the heating chamber (11) of the heating combination furnace (1), the straightened aluminum bronze profile is heated to 650℃-750℃ and held for 1-1.5 hours. 2) After the straightened aluminum bronze profile is naturally cooled to 300℃, it is sent into the processing chamber (12) of the heating combination furnace (1), and the straightened aluminum bronze profile is immersed in activated carbon at 300℃ for 1-3 minutes. 3) Afterwards, the straightened aluminum bronze profile is raised and sprayed with a spraying liquid until its temperature drops to 250℃, then it is reheated by immersing it in an activated carbon layer at 300℃. 4) Repeat step 3) two to three times to obtain the heat-treated aluminum bronze profile; The heating combination furnace (1) includes a heating chamber (11) located on the left side inside the heating combination furnace (1), a processing chamber (12) located on the right side inside the heating combination furnace (1), and a heat-insulating gate (13) for blocking the heating chamber (11) and the processing chamber (12). The bottom of the processing chamber (12) is provided with a storage bin (2) for holding activated carbon, and the top of the processing chamber (12) is provided with a spraying bin (3) for spraying spray liquid. The processing chamber (12) is provided with a lifting mechanism, which is used to control the straightened aluminum bronze profile to switch up and down between the storage bin (2) and the spraying bin (3). The lifting mechanism includes a vertically arranged slide rail (4) connected at both ends to the storage bin (2) and the spray bin (3), a bracket (5) slidably connected to the slide rail (4), and an electric push rod (6) for controlling the bracket (5) to move up and down on the slide rail (4). The electric push rod (6) is fixedly connected to the spray bin (3). Two rollers (21) are provided on the inner wall of the storage bin (2) located on one side of the slide rail (4). The two rollers (21) are symmetrically arranged about the slide rail (4) as the axis of symmetry and are rotatably connected to the inner wall of the storage bin (2) through a torsion spring shaft. A first pressure block (7) is provided on the slide rail (4) located below the bracket (5). Two high-temperature resistant transmission belts (71) are connected to the first pressure block (7). The two high-temperature resistant transmission belts (71) pass through the notch provided at the lower end of the slide rail (4) and are wound and connected to the corresponding roller (21). The top opening of the storage bin (2) is provided with two cover plates (22) symmetrically arranged with the slide rail (4) as the axis of symmetry. The high-temperature resistant transmission belt (71) is provided with a first rack (72) for opening the cover plate (22). Multiple protrusions (73) are provided at equal intervals on the high-temperature resistant transmission belt (71) on both sides of the first rack (72). The storage bin (2) is provided with multiple levers (23) that slide vertically and vertically connected to the inner walls on both sides. One end of each lever (23) corresponds to one of the multiple protrusions (73). Both ends of the levers (23) are provided with high-temperature resistant springs that are connected to the inner wall of the storage bin (2) and are used to cooperate with the protrusions (73) to make the levers (23) reciprocate vertically. The inner wall of the storage bin (2) is provided with a first gear (25) that meshes with the first rack (72) for transmission. The two cover plates (22) are provided with a second rack (24). The inner wall of the storage bin (2) is provided with a second gear (26) that meshes with the second rack (24) for transmission. The inner cavity of the inner wall of the storage bin (2) is provided with a plurality of transmission pulleys (27) that correspond one-to-one with the first gear (25) and the second gear (26) and are connected by a shaft. The two transmission pulleys (27) located on the same side cover plate (22) are connected by a belt. The diameter of the transmission pulley (27) of the first gear (25) is 1.5 times the diameter of the transmission pulley (27) of the second gear (26). A second pressure block (8) is provided on the slide rail (4) above the bracket (5). An airbag column (81) is connected to the second pressure block (8), and the airbag column (81) is fixedly connected to the upper end of the slide rail (4). An air inlet is provided on the top surface of the spray chamber (3). The air inlet is connected to the airbag column (81) through a pipe with a one-way valve. A spray port with a solenoid valve is provided on the bottom surface of the spray chamber (3). A pressure switch (82) is provided on the upper end of the slide rail (4) to trigger the opening of the spray port using the bracket (5). The pressure switch (82) is electrically connected to the solenoid valve.

2. The method for preparing a high-resistance aluminum bronze conductor bar for a high-power industrial motor as described in claim 1, characterized in that, In the raw materials, Cu is added by electrolytic copper plate, Al is added by pure aluminum block, Ni is added by electrolytic nickel plate, and Fe is added by industrial pure copper.

3. The method for preparing a high-resistance aluminum bronze conductor bar for a high-power industrial motor as described in claim 1, characterized in that, In the smelting process, a non-vacuum medium-frequency induction furnace is used for smelting, and the selected raw materials are added together. At the same time, a covering agent is used to protect the surface of the melt formed by the raw materials.

4. The method for preparing a high-resistance aluminum bronze conductor bar for a high-power industrial motor as described in claim 1, characterized in that, When horizontal continuous casting is carried out after the smelting is completed, the casting speed is controlled to ensure that the billet has no shrinkage cavities.

5. The method for preparing a high-resistance aluminum bronze conductor bar for a high-power industrial motor as described in claim 1, characterized in that, The straightening ensures a straightness of ≤1mm / m, and the annealing heat treatment temperature is 650℃-750℃.

6. The method for preparing a high-resistance aluminum bronze conductor bar for a high-power industrial motor as described in claim 1, characterized in that, Steps 2) and 3) are both performed under a nitrogen protective atmosphere.

7. The method for preparing a high-resistance aluminum bronze conductor bar for a high-power industrial motor as described in claim 1, characterized in that, The spray solution is composed of 10-12g copper sulfate, 1-3g copper nitrate, 15-20g ammonium sulfate, 1-5g hydroxyethyl cellulose, and 100mL deionized water; the temperature of the spray solution is 10-35℃.

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