Continuous high-frequency heating annealing device for aluminum alloy cable

Abstract

The invention discloses a continuous high-frequency heating and annealing device for an aluminum alloy cable, and belongs to the field of cable annealing processing, the continuous high-frequency heating and annealing device comprises an annealing furnace body, and the inside of the annealing furnace body is fixedly connected with a first micropore pressure equalizing plate and a second micropore pressure equalizing plate which are arranged in parallel; independent control induction coils are arranged in the preheating cavity, the main heating cavity and the slow cooling cavity. The preheating cavity, the main heating cavity and the slow cooling cavity are each internally provided with a transmission roller set used for feeding the aluminum alloy cable, and the upper portion of the annealing furnace body is further provided with an anti-oxidation assembly and a processing unit. The annealing furnace body is divided into the preheating cavity, the main heating cavity and the slow cooling cavity through the first micropore pressure equalizing plate and the second micropore pressure equalizing plate, the induction coils which are independently controlled are arranged in the preheating cavity, the main heating cavity and the slow cooling cavity, and the temperature sensors are matched; and the temperatures of the preheating cavity, the main heating cavity and the slow cooling cavity can be independently controlled, so that the temperature control is more accurate.

Description

Technical Field

[0001] The present invention relates to the field of cable annealing processing, and more specifically, to a continuous high-frequency heating annealing device for aluminum alloy cables. Background Art

[0002] The ultra-high frequency on-line annealing equipment generates a strong high-frequency electromagnetic field through an induction coil. When a metal material is placed in this electromagnetic field, due to the principle of electromagnetic induction, eddy currents will be rapidly generated inside the metal material. The generation of eddy currents is due to the directional movement of free electrons in the metal material under the action of the magnetic field. During this movement process, electrons continuously collide with metal atoms, thereby converting the energy of the electromagnetic field into heat energy. During the entire annealing process, the metal material continuously passes through the induction coil, and this continuous heating and annealing method can achieve efficient production.

[0003] In actual annealing operations, the thermal expansion coefficient of aluminum alloy is relatively high. If the temperature control accuracy is insufficient during high-frequency heating, it is easy to cause uneven local thermal expansion, resulting in conductor deformation or residual stress accumulation, affecting the mechanical stability of the cable. Even more seriously, it may cause local overheating or even melting of the material, damaging the microstructure of the conductor and affecting the electrical conductivity. At the same time, during the high-frequency heating process, the surface of the aluminum alloy is prone to react with oxygen to form an oxide film with a high resistivity (thickness about 10 nm), which exacerbates the increase in the contact resistance of the conductor and may induce local corrosion risks such as intergranular corrosion and stress corrosion cracking, reducing the long-term reliability of the cable. Summary of the Invention

[0004] Aiming at the problems existing in the prior art, the purpose of the present invention is to provide a continuous high-frequency heating annealing device for aluminum alloy cables.

[0005] To solve the above problems, the present invention adopts the following technical solutions.

[0006] A continuous high-frequency heating annealing device for aluminum alloy cables includes an annealing furnace body. Inside the annealing furnace body, a first micro-hole equalizing plate and a second micro-hole equalizing plate are fixedly connected in parallel. The first micro-hole equalizing plate and the second micro-hole equalizing plate isolate the annealing furnace body into a preheating chamber, a main heating chamber, and a slow cooling chamber. Independent control induction coils are arranged inside the preheating chamber, the main heating chamber, and the slow cooling chamber. An aluminum alloy cable is slidably penetrated between the annealing furnace body, the first micro-hole equalizing plate, and the second micro-hole equalizing plate. Drive roller groups are arranged inside the preheating chamber, the main heating chamber, and the slow cooling chamber to feed the aluminum alloy cable. At the same time, an anti-oxidation component and a treatment unit for inert gas protection inside the annealing furnace body are also provided on the upper part of the annealing furnace body.

[0007] Further, temperature sensors are provided on the inner walls of the preheating chamber, the main heating chamber, and the slow cooling chamber to independently detect the heating temperatures inside the preheating chamber, the main heating chamber, and the slow cooling chamber.

[0008] Further, the anti-oxidation component includes an on-line oxygen analyzer, a condensation deoxidizer, and a nitrogen supplement source that are sequentially arranged on the top of the annealing furnace body. The on-line oxygen analyzer, the condensation deoxidizer, and the nitrogen supplement source are all directly connected through pipelines. The bottom of the on-line oxygen analyzer is connected through a pipeline to a suction fan arranged inside the annealing furnace body. One side of the nitrogen supplement source is connected through a pipeline to a high-temperature resistant circulating fan arranged inside the annealing furnace body. A vacuum pump is also provided on the top of the annealing furnace body; It also includes a movable anti-leakage component arranged at the connection position between the aluminum alloy cable and the annealing furnace body to ensure that outside air will not backflow into the annealing furnace body during the movement of the aluminum alloy cable.

[0009] Further, the movable anti-leakage component includes a nitrogen sealing channel opened on the side wall of the annealing furnace body. The nitrogen sealing channel is connected to the on-line oxygen analyzer through a branched conduit provided, and an electromagnetic valve is provided on the branched conduit; The movable anti-leakage component also includes a high-temperature resistant rubber sealing ring arranged at the connection position between the aluminum alloy cable and the annealing furnace body. An air delivery ring channel is opened inside the high-temperature resistant rubber sealing ring, and the upper end of the air delivery ring channel is communicated with the nitrogen sealing channel. A conductive rubber block is also embedded on the inner side wall of the high-temperature resistant rubber sealing ring. The conductive rubber block is arc-shaped and has the same curvature as the high-temperature resistant rubber sealing ring, and the inner wall of the conductive rubber block is flush with the inner wall of the high-temperature resistant rubber sealing ring. Both ends of the conductive rubber block are electrically connected to the processing unit through wires; An annularly distributed air jet port is also penetrated and opened between the inner wall of the high-temperature resistant rubber sealing ring and the air delivery pipeline.

[0010] Further, the transmission roller group includes a driving roller rotatably connected to the inner wall of the annealing furnace body and located below the aluminum alloy cable, and a driven floating roller assembly rotatably connected to the inner wall of the annealing furnace body and located above the aluminum alloy cable; The driven floating roller assembly includes two rotating shafts rotatably connected to the inner wall of the annealing furnace body. A base cylinder is fixedly connected between the two rotating shafts. One end inside the base cylinder is fixedly connected with a heat-resistant motor. The output shaft of the heat-resistant motor is fixedly connected with a driving shaft. Four uniformly distributed racks are annularly arranged on the outer cylindrical surface of the driving shaft. Four through holes are annularly opened on the outer cylindrical surface of the base cylinder, and ejector rods are penetrated and slidably connected inside the through holes. The outer ends of the ejector rods are all fixedly connected with floating arc-shaped pieces. A spring is also provided between the floating arc-shaped pieces and the base cylinder. Gears are rotatably connected to one ends of the ejector rods located inside the base cylinder, and the gears are meshed with the racks.

[0011] Further, the outer surfaces of the floating arc-shaped pieces are coated with high-temperature resistant ceramic coatings.

[0012] Further, the processing unit is used to collect the temperature data detected by the temperature sensor in real time and calculate the expansion rate of the aluminum alloy cable according to the relevant temperature; calculate the compensation amount that the driven floating roller assembly should compensate based on the expansion rate of the aluminum alloy cable; calculate the wear degree of the conductive rubber block according to the change of the real-time current passing through the conductive rubber block during the friction loss process and control the operation of the movable anti-leakage assembly.

[0013] Further, the processing unit is used to collect the temperature data detected by the temperature sensor in real time and calculate the expansion rate of the aluminum alloy cable according to the relevant temperature, including: Three temperature sensors respectively arranged inside the preheating chamber, the main heating chamber and the slow cooling chamber detect the temperatures of the corresponding chambers in real time, and the processing unit receives the relevant temperature information and calculates the respective expansion rates of the aluminum alloy cable inside the preheating chamber, the main heating chamber and the slow cooling chamber.

[0014] Further, calculating the compensation amount that the driven floating roller assembly should compensate based on the expansion rate of the aluminum alloy cable, including: Based on the calculation results of the processing unit on the respective expansion rates of the aluminum alloy cable inside the preheating chamber, the main heating chamber and the slow cooling chamber, establish a calculation formula, obtain the compensation amount that the driven floating roller assembly should compensate and perform compensation.

[0015] Further, calculating the wear degree of the high-temperature resistant rubber sealing ring according to the change of the real-time current passing through the conductive rubber block during the friction loss process and controlling the operation of the movable anti-leakage assembly, including: Based on the change of the real-time current passing through the conductive rubber block during the friction loss process, obtain the wear degree of the high-temperature resistant rubber sealing ring by the aluminum alloy cable during the traveling process. After reaching the wear index, control the operation of the movable anti-leakage assembly to assist in sealing the current processing environment.

[0016] Compared with the prior art, the beneficial effects of the present invention: (1) In this application, the annealing furnace body is isolated into a preheating chamber, a main heating chamber and a slow cooling chamber by using the first micro-hole equalizing plate and the second micro-hole equalizing plate, and independent control induction coils are arranged inside the preheating chamber, the main heating chamber and the slow cooling chamber. Cooperating with the temperature sensor, the temperatures of the preheating chamber, the main heating chamber and the slow cooling chamber can be independently controlled, making the temperature control more accurate, reducing the risk of thermal runaway, and ensuring the mechanical stability of the aluminum alloy cable.

[0017] (2) By providing a movable anti-leakage component, the present application can provide a relatively sealed nitrogen environment during the annealing process of the aluminum alloy cable to prevent oxidation of the aluminum alloy cable by oxygen, prevent the increase of the conductor contact resistance, avoid the risk of local corrosion such as intergranular corrosion and stress corrosion cracking, and provide long-term reliability of the cable.

[0018] (3) By providing a driven floating roller component, during the heating process of the aluminum alloy cable, the present application can automatically compensate the roller distance according to the different heating temperatures of the preheating chamber, the main heating chamber, and the slow cooling chamber, ensure the advancement of the aluminum alloy cable, and avoid the situation of limited advancement or direct jamming caused by thermal expansion. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 is a schematic diagram of the overall structure of the present invention; Figure 2 of the present invention Figure 1 is a schematic sectional structure diagram; Figure 3 of the present invention Figure 2 is an enlarged schematic structure diagram at A in the present invention; Figure 4 is a schematic sectional structure diagram of the movable anti-leakage component of the present invention; Figure 5 is a schematic partial three-dimensional structure diagram of the driven floating roller component of the present invention; Figure 6 of the present invention Figure 5 is a schematic sectional structure diagram.

[0020] Description of the reference numerals in the drawings: 1. Annealing furnace body; 2. Driving roller; 3. Driven floating roller component; 31. Rotating shaft; 32. Base cylinder; 33. Floating arc-shaped piece; 34. Heat-resistant motor; 35. Driving shaft; 36. Rack; 37. Gear; 38. Ejecting rod; 39. Spring; 4. Movable anti-leakage component; 41. High-temperature resistant rubber sealing ring; 42. Gas transmission ring channel; 43. Conductive rubber block; 44. Jet orifice; 5. First micro-hole equalizing plate; 6. Temperature sensor; 7. Nitrogen replenishment source; 8. Condensation deoxidizer; 9. Vacuum pump; 10. Online oxygen analyzer; 11. Aluminum alloy cable; 12. Induction coil; 13. Second micro-hole equalizing plate; 14. High-temperature resistant circulating fan; 15. Exhaust fan; 16. Branch conduit; 17. Nitrogen sealing channel. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0021] The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention; obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0022] Please refer to Figures 1 to 6 , an aluminum alloy cable continuous high-frequency heating annealing device, including an annealing furnace body 1, inside the annealing furnace body 1, a first microporous uniform pressure plate 5 and a second microporous uniform pressure plate 13 are fixedly connected in parallel. The first microporous uniform pressure plate 5 and the second microporous uniform pressure plate 13 isolate the annealing furnace body 1 into a preheating chamber, a main heating chamber and a slow cooling chamber; independent control induction coils 12 are arranged inside the preheating chamber, the main heating chamber and the slow cooling chamber. An aluminum alloy cable 11 is slidably penetrated between the annealing furnace body 1, the first microporous uniform pressure plate 5 and the second microporous uniform pressure plate 13. Drive roller groups are arranged inside the preheating chamber, the main heating chamber and the slow cooling chamber to feed the aluminum alloy cable 11. At the same time, an anti-oxidation component and a processing unit for inert gas protection inside the annealing furnace body 1 are also provided on the upper part of the annealing furnace body 1.

[0023] Temperature sensors 6 are arranged on the inner walls of the preheating chamber, the main heating chamber and the slow cooling chamber to independently detect the heating temperatures inside the preheating chamber, the main heating chamber and the slow cooling chamber.

[0024] By adopting the above technical solutions, the annealing furnace body 1 is isolated into a preheating chamber, a main heating chamber and a slow cooling chamber by using the first microporous uniform pressure plate 5 and the second microporous uniform pressure plate 13, and independent control induction coils 12 are arranged inside the preheating chamber, the main heating chamber and the slow cooling chamber. Cooperating with the temperature sensors 6, the temperatures of the preheating chamber, the main heating chamber and the slow cooling chamber can be independently controlled, making the temperature control more accurate. When annealing the aluminum alloy cable 11, it is connected through the first microporous uniform pressure plate 5 and the second microporous uniform pressure plate 13. Note that the holes of the first microporous uniform pressure plate 5 and the second microporous uniform pressure plate 13 are relatively dense, and the surface is coated with a heat-insulating layer material, which can avoid the diffusion of heat from the high-temperature area to the low-temperature area. The best temperature range can be set for different stages (such as 400-600 °C in the preheating chamber, 800-980 °C in the main heating chamber, and a certain degree of heat preservation in the slow cooling chamber), reducing the risk of thermal runaway and ensuring the mechanical stability of the aluminum alloy cable 11.

[0025] In some embodiments, such as Figure 2 and Figure 3As shown in the figure, the anti-oxidation component includes an on-line oxygen analyzer 10, a condensation deoxidizer 8, and a nitrogen replenishment source 7 that are sequentially arranged on the top of the annealing furnace body 1. The on-line oxygen analyzer 10, the condensation deoxidizer 8, and the nitrogen replenishment source 7 are all directly connected through pipelines. The bottom of the on-line oxygen analyzer 10 is connected through a pipeline to a suction fan 15 arranged inside the annealing furnace body 1. One side of the nitrogen replenishment source 7 is connected through a pipeline to a high-temperature resistant circulating fan 14 arranged inside the annealing furnace body 1. A vacuum pump 9 is also provided on the top of the annealing furnace body 1; It also includes a movable anti-leakage component 4 arranged at the connection position between the aluminum alloy cable 11 and the annealing furnace body 1, which is used to ensure that external air will not flow back into the annealing furnace body 1 during the movement of the aluminum alloy cable 11.

[0026] In some embodiments, such as Figure 3 and Figure 4 As shown in the figure, the movable anti-leakage component 4 includes a nitrogen sealing channel 17 opened on the side wall of the annealing furnace body 1. The nitrogen sealing channel 17 is connected to the on-line oxygen analyzer 10 through a branched conduit 16 provided, and an electromagnetic valve is provided on the branched conduit 16; The movable anti-leakage component 4 also includes a high-temperature resistant rubber sealing ring 41 arranged at the connection position between the aluminum alloy cable 11 and the annealing furnace body 1. An air delivery ring channel 42 is opened inside the high-temperature resistant rubber sealing ring 41, and the upper end of the air delivery ring channel 42 is communicated with the nitrogen sealing channel 17. A conductive rubber block 43 is also embedded on the inner side wall of the high-temperature resistant rubber sealing ring 41. The conductive rubber block 43 is arc-shaped and has the same curvature as the high-temperature resistant rubber sealing ring 41, and the inner wall of the conductive rubber block 43 is flush with the inner wall of the high-temperature resistant rubber sealing ring 41. Both ends of the conductive rubber block 43 are electrically connected to the processing unit through wires; An annularly distributed air jet port 44 is also penetrated and opened between the inner wall of the high-temperature resistant rubber sealing ring 41 and the air delivery ring channel 42.

[0027] During the high-frequency heating process, the surface of the aluminum alloy is prone to react with oxygen to form an oxide film with a high resistivity (thickness about 10 nm), which exacerbates the increase in conductor contact resistance and may induce local corrosion risks such as intergranular corrosion and stress corrosion cracking, reducing the long-term reliability of the cable. To address this problem, by setting up the movable anti-leakage component 4, during the high-frequency heating annealing process, first, the vacuum pump 9 is used to evacuate the air inside the annealing furnace body 1, and then the nitrogen replenishment source 7 is started. The nitrogen replenishment source 7 can be a steel cylinder filled with liquid nitrogen or other nitrogen storage equipment. The vaporized nitrogen enters the high-temperature resistant circulating fan 14 through the conduit, and then diffuses into the entire annealing furnace body 1 through the first micro-hole equalizing plate 5 and the second micro-hole equalizing plate 13. The micro-hole structures of the first micro-hole equalizing plate 5 and the second micro-hole equalizing plate 13 limit the nitrogen flow rate and disperse the air flow direction, enabling the nitrogen to form a laminar flow inside the annealing furnace body 1, reducing the pressure mutation caused by turbulence, and ensuring uniform nitrogen coverage in each area. Then, the nitrogen is attracted by the suction fan 15 and the oxygen content in the gas is detected by the on-line oxygen analyzer 10. If the outside air enters due to long-term use or excessive wear of the high-temperature resistant rubber seal ring 41, resulting in an increase in the oxygen content in the gas exceeding the critical value, the condensation deoxidizer 8 can be used to remove the oxygen in the gas. This is the prior art and will not be elaborated here. To ensure the nitrogen purity, it should be noted that both the condensation deoxidizer 8 and the nitrogen replenishment source 7 are connected to the conduit through a three-way joint and are used when needed. The deoxygenated nitrogen is circulated back to the nitrogen replenishment source 7 to enter the next cycle.

[0028] It should be noted that at the connection position of the aluminum alloy cable 11 and the right side of the annealing furnace body 1 (i.e., the side wall of the slow cooling chamber), there are also corresponding nitrogen sealing channels 17 and branch conduits 16, etc. The branch conduit 16 is communicated with the nitrogen replenishment source 7, which is not shown in the figure and is hereby explained.

[0029] During the nitrogen circulation process, due to the movement of the aluminum alloy cable 11, continuous friction will occur between it and the high-temperature resistant rubber seal ring 41, causing continuous wear of the high-temperature resistant rubber seal ring 41 and resulting in a decrease in airtightness. Air is likely to enter the annealing furnace body 1. By setting up the conductive rubber block 43, the friction degree of the high-temperature resistant rubber seal ring 41 can be detected (see the following text for details). If the high-temperature resistant rubber seal ring 41 reaches the calibrated limit friction degree value, at this time, the processing unit controls the solenoid valve to open, and a part of the nitrogen in the circulation route will enter the nitrogen sealing channel 17 through the branch conduit 16, and is ejected through the gas transmission ring channel 42 and the air jet port 44 to form an air curtain between the aluminum alloy cable 11 and the high-temperature resistant rubber seal ring 41 to block the entry of air.

[0030] In some embodiments, such as Figure 5 and Figure 6As shown, the drive roller group includes a driving roller 2 rotatably connected to the inner wall of the annealing furnace body 1 and located below the aluminum alloy cable 11, and a driven floating roller assembly 3 rotatably connected to the inner wall of the annealing furnace body 1 and located above the aluminum alloy cable 11; The driven floating roller assembly 3 includes two rotating shafts 31 rotatably connected to the inner wall of the annealing furnace body 1. A base cylinder 32 is fixedly connected between the two rotating shafts 31. One end inside the base cylinder 32 is fixedly connected with a heat-resistant motor 34. The output shaft of the heat-resistant motor 34 is fixedly connected with a driving shaft 35. Four uniformly distributed racks 36 are annularly arranged on the outer cylindrical surface of the driving shaft 35. Four through holes are annularly formed in the outer cylindrical surface of the base cylinder 32, and ejector rods 38 are respectively penetrated and slidably connected inside the through holes. Floating arc-shaped pieces 33 are fixedly connected to the outer ends of the ejector rods 38. A spring 39 is further arranged between the floating arc-shaped piece 33 and the base cylinder 32. Gears 37 are rotatably connected to one ends of the ejector rods 38 located inside the base cylinder 32, and the gears 37 are meshed with the racks 36.

[0031] The outer surfaces of the floating arc-shaped pieces 33 are all coated with a high-temperature resistant ceramic coating.

[0032] During the high-frequency heating process, due to the large thermal expansion of the aluminum alloy material, its diameter will change during the heating process. At this time, the traditional fixed-distance drive roller cannot automatically adjust the roller distance according to the expansion degree of the aluminum alloy cable 11, resulting in the limited movement of the aluminum alloy cable 11 or directly causing jamming. By setting the driven floating roller assembly 3, during annealing, the temperature sensors 6 in the preheating chamber, the main heating chamber, and the slow cooling chamber will detect the current temperature of their respective chambers and transmit it to the processing unit through the signal transceiver module. The processing unit calculates the expansion values of the aluminum alloy cable 11 affected by different temperatures in their respective segments according to relevant data and converts them into the compensation angles required by the heat-resistant motor 34. For details, see the following text. Then, the heat-resistant motor 34 is started to work, rotate the compensation angle, drive the driving shaft 35 to rotate by a relevant angle, synchronously drive the rack 36 to rotate, and the rotation of the rack 36 will drive the meshing gear 37 to rotate and push the gear 37 outwards of the base cylinder 32, synchronously pushing the ejector rod 38 to move outwards, so that the four floating arc-shaped pieces 33 expand outwards to the required compensated roller distance. It should be noted here that the spring 39 is in a compressed state in the initial state, that is, when the gear 37 is closest to the driving shaft 35, which can prevent the floating arc-shaped piece 33 from automatically sagging under the influence of gravity when moving downwards.

[0033] In some embodiments, the processing unit is configured to collect in real time the temperature data detected by the temperature sensor 6 and calculate the expansion rate of the aluminum alloy cable 11 based on the relevant temperature: The three temperature sensors 6 respectively arranged inside the preheating chamber, the main heating chamber, and the slow cooling chamber detect the temperatures of the corresponding chambers in real time, and the processing unit receives the relevant temperature information and calculates the respective expansion rates of the aluminum alloy cable 11 inside the preheating chamber, the main heating chamber, and the slow cooling chamber.

[0034] By adopting the above technical solution, based on the three temperature sensors 6 arranged inside the preheating chamber, the main heating chamber, and the slow cooling chamber to detect the temperatures of the corresponding chambers in real time, the processing unit receives the relevant temperature information and establishes relevant calculation formulas to calculate the radius expansion value of the aluminum alloy cable 11 before and after heating:

[0035] Among them, is the radius compensation amount required by the driven floating roller assembly 3, is the linear expansion coefficient of the aluminum alloy, which can be directly obtained by referring to relevant materials, is the initial radius of the aluminum alloy cable 11, is the temperature after change; is the temperature before change.

[0036] In some embodiments, based on the expansion rate of the aluminum alloy cable 11, the compensation amount of the driven floating roller assembly 3 is calculated. Based on the calculation results of the processing unit on the respective expansion rates of the aluminum alloy cable 11 inside the preheating chamber, the main heating chamber, and the slow cooling chamber, calculation formulas are established to obtain the compensation amount of the driven floating roller assembly 3 and perform compensation.

[0037] By adopting the above technical solution, according to the radius expansion value of the aluminum alloy cable 11 before and after the temperature change, relevant formulas are established to obtain the compensation angle that the heat-resistant motor 34 should rotate:

[0038] Among them, is the compensation angle that the heat-resistant motor 34 should rotate, is the radius compensation amount required by the driven floating roller assembly 3, is the horizontal moving distance of the center point of the gear 37 on the rack 36, which can be directly obtained by arranging a displacement sensor inside the base cylinder 32.

[0039] In some implementations, the wear degree of the high-temperature resistant rubber sealing ring 41 is calculated based on the change in the real-time current passing through during the friction loss process of the conductive rubber block 43, and the movable anti-leakage component 4 is controlled to work. Based on the change in the real-time current passing through during the friction loss process of the conductive rubber block 43, the wear degree of the high-temperature resistant rubber sealing ring 41 caused by the aluminum alloy cable 11 during its movement is obtained. After reaching the wear index, the movable anti-leakage component 4 is controlled to work to assist in sealing the current processing environment.

[0040] The conductive rubber block 43 is made by mixing conductive metal powder and rubber in a certain proportion. It has the properties of rubber and also has conductivity. First of all, it is necessary to know the relationship between the resistance value of the conductive rubber block 43 and its physical dimensions (such as length and cross-sectional area). According to Ohm's law, the resistance R is proportional to the conductor length L and inversely proportional to the conductor cross-sectional area A, that is , where is the resistivity, which is an inherent property of the material. Considering the wear situation of the conductive rubber block 43, when the conductive rubber block 43 wears, its cross-sectional area will decrease. Since the resistance is inversely proportional to the cross-sectional area, the decrease in the cross-sectional area will lead to an increase in the resistance. According to Ohm's law, , if the voltage across the conductive rubber block 43 remains unchanged and the resistance increases, the current in its circuit will decrease accordingly; In order to monitor the wear degree of the conductive rubber block 43, this electrical property can be utilized. First, it is necessary to measure and record the magnitude of the circuit current and the corresponding dimension data of the conductive rubber block 43 in the initial state (i.e., when not worn). Subsequently, during the use of the conductive rubber block 43, by measuring the current value in the circuit and comparing it with the initial current, the dimensional change after wear can be deduced. Since the conductive rubber block 43 is installed on the high-temperature resistant rubber sealing ring 41 and the two will remain synchronized during the wear process, the wear state of the high-temperature resistant rubber sealing ring 41 can be indirectly evaluated through the wear situation of the conductive rubber block 43. Measure and record the size of the high-temperature resistant rubber sealing ring 41 before wear in advance, as well as the corresponding relationship between the current change in the circuit of the conductive rubber block 43 and the dimensional change of the high-temperature resistant rubber sealing ring 41. In this way, the processing unit can accurately judge the wear degree of the high-temperature resistant rubber sealing ring 41 by monitoring the magnitude of the current in the circuit of the conductive rubber block 43.

[0041] It should also be noted here that the wear resistance of the high-temperature resistant rubber sealing ring 41 should be set to the same degree as that of the conductive rubber block 43 to control variables.

[0042] The above are only the preferred specific embodiments of the present invention; however, the protection scope of the present invention is not limited thereto. Any person skilled in the art within the technical scope disclosed by the present invention, according to the technical solution of the present invention and its improved concept, making equivalent substitutions or changes, should be covered by the protection scope of the present invention.

Claims

1. A continuous high-frequency heating annealing device for aluminum alloy cables, comprising an annealing furnace body (1), characterized in that: Inside the annealing furnace body (1), a first micro-hole equalizing plate (5) and a second micro-hole equalizing plate (13) which are fixedly connected and arranged in parallel are provided. The first micro-hole equalizing plate (5) and the second micro-hole equalizing plate (13) divide the annealing furnace body (1) into a preheating chamber, a main heating chamber and a slow cooling chamber. Independent control induction coils (12) are provided inside the preheating chamber, the main heating chamber and the slow cooling chamber. An aluminum alloy cable (11) is slidably penetrated between the annealing furnace body (1), the first micro-hole equalizing plate (5) and the second micro-hole equalizing plate (13). Inside the preheating chamber, the main heating chamber and the slow cooling chamber, a driving roller group is provided to feed the aluminum alloy cable (11). At the same time, an anti-oxidation component and a processing unit for inert gas protection inside the annealing furnace body (1) are also provided on the upper part of the annealing furnace body (1).

2. The aluminum alloy cable continuous high-frequency heating annealing device according to claim 1, wherein: Temperature sensors (6) are provided on the inner walls of the preheating chamber, the main heating chamber and the slow cooling chamber to independently detect the heating temperatures inside the preheating chamber, the main heating chamber and the slow cooling chamber.

3. The continuous high-frequency heating annealing device for aluminum alloy cables according to claim 1, wherein: The anti-oxidation component includes an on-line oxygen analyzer (10), a condensation deoxidizer (8) and a nitrogen supplement source (7) which are sequentially arranged on the top of the annealing furnace body (1). The on-line oxygen analyzer (10), the condensation deoxidizer (8) and the nitrogen supplement source (7) are all connected by pipelines. The bottom of the on-line oxygen analyzer (10) is connected by a pipeline to an induced draft fan (15) provided inside the annealing furnace body (1). One side of the nitrogen supplement source (7) is connected by a pipeline to a high-temperature resistant circulating fan (14) provided inside the annealing furnace body (1). A vacuum pump (9) is also provided on the top of the annealing furnace body (1). It also includes a movable anti-leakage component (4) arranged at the connection position of the aluminum alloy cable (11) and the annealing furnace body (1) to ensure that outside air will not backflow into the annealing furnace body (1) during the movement of the aluminum alloy cable (11).

4. The aluminum alloy cable continuous high-frequency heating annealing device according to claim 3, characterized in that: The movable anti-leakage component (4) includes a nitrogen sealing channel (17) opened on the side wall of the annealing furnace body (1). The nitrogen sealing channel (17) is connected to the on-line oxygen analyzer (10) through a branched conduit (16) provided, and a solenoid valve is provided on the branched conduit (16). The movable anti-leakage component (4) also includes a high-temperature resistant rubber sealing ring (41) arranged at the connection position of the aluminum alloy cable (11) and the annealing furnace body (1). An air delivery annular channel (42) is opened inside the high-temperature resistant rubber sealing ring (41), and the upper end of the air delivery annular channel (42) is communicated with the nitrogen sealing channel (17). A conductive rubber block (43) is also embedded on the inner side wall of the high-temperature resistant rubber sealing ring (41). The conductive rubber block (43) is arc-shaped and has the same curvature as the high-temperature resistant rubber sealing ring (41), and the inner wall of the conductive rubber block (43) is flush with the inner wall of the high-temperature resistant rubber sealing ring (41). Both ends of the conductive rubber block (43) are electrically connected to the processing unit through wires. Annularly distributed air jet ports (44) are also penetrated between the inner wall of the high-temperature resistant rubber sealing ring (41) and the air delivery annular channel (42).

5. The continuous high-frequency heating annealing device for aluminum alloy cables according to claim 1, wherein: The driving roller set includes a driving roller (2) rotatably connected to the inner wall of the annealing furnace body (1) and located below the aluminum alloy cable (11), and a driven floating roller assembly (3) rotatably connected to the inner wall of the annealing furnace body (1) and located above the aluminum alloy cable (11). The driven floating roller assembly (3) includes two rotating shafts (31) rotatably connected to the inner wall of the annealing furnace body (1). A base cylinder (32) is fixedly connected between the two rotating shafts (31). One end inside the base cylinder (32) is fixedly connected with a heat-resistant motor (34). The output shaft of the heat-resistant motor (34) is fixedly connected with a driving shaft (35). Four uniformly distributed racks (36) are annularly arranged on the outer cylindrical surface of the driving shaft (35). Four through holes are annularly formed on the outer cylindrical surface of the base cylinder (32), and ejector rods (38) penetrate and are slidably connected inside the through holes. Floating arc-shaped pieces (33) are fixedly connected to the outer ends of the ejector rods (38). A spring (39) is further arranged between the floating arc-shaped pieces (33) and the base cylinder (32). Gears (37) are rotatably connected to the ends of the ejector rods (38) located inside the base cylinder (32), and the gears (37) are meshed with the racks (36).

6. The continuous high-frequency heating and annealing device for aluminum alloy cables according to claim 5, characterized in that: The outer surfaces of the floating arc-shaped pieces (33) are all coated with high-temperature resistant ceramic coatings.

7. The continuous high-frequency heating annealing device for aluminum alloy cables according to claim 4, wherein: The processing unit is used to collect in real time the temperature data detected by the temperature sensors (6), calculate the expansion rate of the aluminum alloy cable (11) according to the relevant temperature; calculate the compensation amount that the driven floating roller assembly (3) should have based on the expansion rate of the aluminum alloy cable (11); calculate the wear degree of the conductive rubber block (43) according to the change of the real-time current passing through during the friction loss process of the conductive rubber block (43) and control the operation of the movable anti-leakage assembly (4).

8. The continuous high-frequency heating annealing device for aluminum alloy cables according to claim 7, characterized in that: The processing unit is used to collect in real time the temperature data detected by the temperature sensors (6) and calculate the expansion rate of the aluminum alloy cable (11) according to the relevant temperature, including: Three temperature sensors (6) respectively arranged inside the preheating chamber, the main heating chamber, and the slow cooling chamber detect the temperatures of the corresponding chambers in real time. The processing unit receives the relevant temperature information and calculates the respective expansion rates of the aluminum alloy cable (11) inside the preheating chamber, the main heating chamber, and the slow cooling chamber.

9. The aluminum alloy cable continuous high-frequency heating annealing device according to claim 7, characterized in that: Calculating the compensation amount that the driven floating roller assembly (3) should have based on the expansion rate of the aluminum alloy cable (11), including: Based on the calculation results of the processing unit on the respective expansion rates of the aluminum alloy cable (11) inside the preheating chamber, the main heating chamber, and the slow cooling chamber, establish a calculation formula, obtain the compensation amount that the driven floating roller assembly (3) should have and perform compensation.

10. The aluminum alloy cable continuous high-frequency heating annealing device according to claim 7, wherein: Calculating the wear degree of the high-temperature resistant rubber sealing ring (41) according to the change of the real-time current passing through during the friction loss process of the conductive rubber block (43) and controlling the operation of the movable anti-leakage assembly (4), including: Based on the change of the real-time current passing through during the friction loss process of the conductive rubber block (43), obtain the wear degree of the high-temperature resistant rubber sealing ring (41) by the aluminum alloy cable (11) during the traveling process. After reaching the wear index, control the operation of the movable anti-leakage assembly (4) to perform auxiliary sealing on the current processing environment.

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