Stainless steel wire annealing furnace for continuous production operation and use method

Abstract

The invention relates to the technical field of stainless steel wire annealing processing, in particular to a stainless steel wire annealing furnace for continuous production operation and a using method, the stainless steel wire annealing furnace comprises a machine body for conveying a single steel wire bundle from left to right, and further comprises a pretreatment tool, a first liquid supply device, a second liquid supply device and a second liquid supply device, the first liquid supply device supplies acid pickling mixed liquid composed of 10% of nitric acid, 15% of hydrofluoric acid and 75% of purified water to the elastic rubbing device, and the acid pickling part cleans an oxide layer on the surface of the single-bundle steel wire through the elastic rubbing device dip-dyed with the acid pickling mixed liquid. According to the invention, a pretreatment tool is arranged by utilizing a pretreatment case, and an introduction roller and a lead-out roller are symmetrically arranged by taking an adjustable support roller position as a reference object, so that the overall temperature of a single steel wire bundle is rapidly increased to 1050-1100 DEG C; a water mist radiator and a laser ultrasonic detector are arranged in the discharging machine box, the single-beam steel wire subjected to high-temperature annealing is cooled, and meanwhile the structural integrity of the single-beam steel wire is detected in real time.

Description

Technical Field

[0001] This invention relates to the field of stainless steel wire annealing technology, and in particular to a stainless steel wire annealing furnace and its method of use for continuous production operations. Background Technology

[0002] Stainless steel wire is widely used in medical devices, precision instruments, textile machinery, and automotive parts due to its excellent corrosion resistance, mechanical properties, and machinability. Annealing is a crucial heat treatment process in the production and processing of stainless steel wire, directly affecting its final performance and application.

[0003] Existing annealing processes often employ a precision feeding and conveying device for stainless steel welding wire annealing furnaces, as proposed in application number CN202221670624.0. This device proposes feeding several stainless steel welding wires through a feeding rack, sequentially feeding them through the wire routing holes on the bottom feeding plate to evenly distribute and convey the wires. Then, the wires are fed into the feeding rollers on the feeding support plate via auxiliary feeding rollers. However, stainless steel welding wires are long and have a certain degree of toughness. The wire routing holes can only guide the wires, and the feeding rollers can only provide traction. During the annealing process, the stainless steel welding wires undergo changes in state and even structural deformation. Especially during heat treatment, thermal expansion and contraction can cause unexpected structural extension of the wires. The lack of corresponding limiting and shaping measures will affect the orderly feeding of the stainless steel welding wires in the annealing furnace and may even cause feeding blockages, which is detrimental to subsequent annealing operations.

[0004] For example, CN202022573355.3 proposes an annealing furnace for stainless steel slitting. It has heating wires fixedly installed on the inner surface of the furnace door, and protective beams fixedly installed on the outer side of the heating wires. The protective beams prevent the heating wires from being bumped or damaged. However, using a single type of heating wire makes it difficult to perform multi-level heating treatment on the stainless steel slitting wires, making it difficult to reach the required temperature during the annealing process. More importantly, although existing stainless steel wires have a high degree of rust resistance, they can still form an oxide layer contamination on their surface due to contact with moisture and corrosive substances. Without proper treatment before annealing, or with only simple scraping and cleaning, it is difficult to achieve comprehensive cleaning of the outer surface and to completely remove the oxide layer contaminants from the stainless steel wires. Using a single type of heating wire for heating in the annealing process not only results in low efficiency and low degree of heating, but also fails to guarantee the stability and safety of the stainless steel wire. Stainless steel wire is prone to drastic structural changes when the temperature rises sharply and there is a lack of corresponding protective treatment. Because the annealing process requires high temperatures, traditional heating methods are prone to causing temperature imbalance between the inside and outside of the stainless steel wire, resulting in significant problems of overheating in the core and underheating on the surface. Summary of the Invention

[0005] The purpose of this invention is to solve the problem in the prior art that it is difficult to control the temperature of stainless steel wire, which affects the quality of annealing. Therefore, this invention proposes a stainless steel wire annealing furnace and its usage method for continuous production.

[0006] To achieve the above objectives, the present invention adopts the following technical solution: An annealing furnace for stainless steel wire in continuous production operations includes a body for conveying a single bundle of steel wire from left to right, and further includes: A pretreatment fixture, comprising an acid pickling section, the acid pickling section comprising a first liquid feeder and an elastic scraping device, wherein the first liquid feeder supplies the elastic scraping device with an acid pickling mixture consisting of 10% nitric acid, 15% hydrofluoric acid and 75% purified water, and the acid pickling section cleans the oxide layer on the surface of a single bundle of steel wire by means of the elastic scraping device immersed in the acid pickling mixture. A preheating fixture is used to heat the pretreated single bundle of steel wire to 500-800°C. An annealing fixture includes a mixed gas section and a dual heat source section. The mixed gas section includes a gas supply device for supplying a mixed protective gas formed by mixing 70% nitrogen, 5% hydrogen, and 25% argon. The dual heat source section consists of a microwave generator, a plasma generator, a graphite nozzle, and a sandpaper polishing component. In the mixed protective environment, the microwave generator first heats the interior of the preheated single bundle of steel wire to 1050-1100°C, and the plasma generator then heats the surface of the preheated single bundle of steel wire to 1050-110°C.

[0007] Preferably, the body is provided with: A pre-processing chassis, located at the left end of the machine body, is used to house pre-processing fixtures. A preheating chamber is located to the right of the pretreatment chamber and is used to house preheating fixtures. Annealing chamber, which is located to the right of preheating chamber and is used to house annealing fixtures; The discharge box is located on the right side of the annealing box and at the right end of the machine body. The discharge box is equipped with a discharge fixture for cooling and inspecting the single bundle of steel wire after annealing.

[0008] Preferably, the pretreatment box, preheating box, annealing box and discharge box are provided with wire feeding ports for passing through single bundles of steel wires on both the left and right side walls.

[0009] Preferably, the pretreatment fixture further includes a tightening section and a cleaning section: The tightening section includes an inlet roller, an outlet roller, and an adjustable support roller. The inlet roller is located on the left side of the pretreatment machine housing, the outlet roller is located in the middle of the pretreatment machine housing, and the adjustable support roller is located between the inlet roller and the outlet roller. The cleaning unit includes a second liquid supply device and an ultrasonic cleaner. The second liquid supply device is used to supply deionized water to the ultrasonic cleaner, which uses deionized water to high-frequency rinse the acid-washed single bundle of steel wire.

[0010] Preferably, the first liquid supply device is located above the elastic scraping device.

[0011] Preferably, there are two elastic scraping devices, which move spirally from right to left around the single bundle of steel wire to pickle the oxide layer on the surface of the single bundle of steel wire.

[0012] Preferably, the preheating fixture includes an electric heating element, which has a semi-circular structure.

[0013] Preferably, the mixed gas section includes: A gas supply device for supplying mixed protective gas into the annealing chamber; The sealing element consists of two parts, which are slidably installed on the inner wall of the annealing machine housing corresponding to the wire feeding port, and the sealing element is equipped with a closing pin.

[0014] Preferably, the microwave generator and the plasma generator are arranged from left to right, the graphite nozzle is located to the left of the microwave generator, and the sandpaper polishing component is located between the microwave generator and the plasma generator.

[0015] The above-mentioned method of using a stainless steel wire annealing furnace for continuous production includes the following steps: Step S1: Pass the single bundle of steel wires from left to right through the pretreatment box, preheating box, annealing box and discharge box in sequence. Step S2: Control the adjustable support roller to lift, extend and retract to keep the single bundle of steel wires taut during transport. Acid washing mixture is supplied to the elastic scraping device through the first liquid supply device. The oxide layer on the surface of the single bundle of steel wires is then scrubbed by the elastic scraping device. Deionized water is supplied to the ultrasonic cleaner through the second liquid supply device. The ultrasonic cleaner is used to rinse the oil stains on the single bundle of steel wires. Step S3: Dynamically heat the rinsed single bundle of steel wire to 500-800℃ using an electric heating element; Step S4: Use a gas supply device to input mixed protective gas into the annealing chamber, use a sealing device and a closing device to seal the two wire feeding ports in the annealing chamber, use a graphite nozzle to spray a graphite coating onto the preheated single bundle of steel wire, use a microwave generator to heat the inside of the single bundle of steel wire to 1050-1100℃, use a sandpaper polishing device to wipe and clean the graphite coating on the surface of the microwave-heated single bundle of steel wire, and use an upper plasma generator to heat the surface of the single bundle of steel wire to 1050-1100℃. Step S5: Control the annealed single bundle of steel wires to pass through the discharge box, and use the discharge fixture to perform water mist cooling and structural integrity testing on the single bundle of steel wires.

[0016] Compared with the prior art, the present invention has the following advantages: 1. The present invention utilizes a pre-processing machine box to set up pre-processing fixtures, and symmetrically sets up the inlet roller and outlet roller with adjustable support roller position reference. By adjusting the limiting roller in the adjustable support roller, the single bundle of steel wire is conveyed in an M-shaped structure to maintain a tight and orderly state.

[0017] 2. This invention sets up an acid pickling section and a cleaning section in the pretreatment chamber. The first liquid supply device drips an acid pickling mixture consisting of 10% nitric acid, 15% hydrofluoric acid and 75% purified water into the radial receiving cavity. In conjunction with a retractable elastic scraping device, the elastic scraping device dynamically wipes and cleans the oxide layer and oil stains attached to the single bundle of steel wires during the spiral movement. The second liquid supply device provides deionized water to the ultrasonic cleaner to facilitate the ultrasonic cleaning of the acid-pickled single bundle of steel wires with deionized water, providing a clean stainless steel substrate for the annealing process.

[0018] 3. The present invention provides a first driving gear and a first driven gear that are meshed in the preheating chamber, so as to provide an electric heating element that can rotate repeatedly around a single bundle of steel wires, so as to preheat the pretreated single bundle of steel wires and make sufficient preheating preparations for the annealing process.

[0019] 4. This invention sets up a mixing gas section in the annealing chamber and manages the annealing chamber in a closed manner, so that the annealing operation can be carried out in a sealed environment of mixed protective gas formed by 70% nitrogen, 5% hydrogen and 25% argon. Under the premise of ensuring stable and safe heating, two sets of C-shaped swing frames are used to set up microwave generators and plasma generators to heat the interior and surface of the single bundle of steel wires separately, so that the overall temperature of the single bundle of steel wires can be rapidly raised to 1050-1100℃.

[0020] 5. The present invention provides a water mist radiator and a laser ultrasonic detector arranged in sequence in the discharge box to effectively cool the single bundle of steel wire after high-temperature annealing, and at the same time to detect the structural integrity of the single bundle of steel wire in real time. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the structure of a stainless steel wire annealing furnace for continuous production operations proposed in this invention. Figure 2 This is a bottom view of a stainless steel wire annealing furnace for continuous production operations proposed in this invention. Figure 3 This is a front sectional view of a stainless steel wire annealing furnace for continuous production operations proposed in this invention. Figure 4 This is a rear sectional view of a stainless steel wire annealing furnace for continuous production operations proposed in this invention. Figure 5 This is a schematic diagram of the pretreatment tooling structure of a stainless steel wire annealing furnace for continuous production operations proposed in this invention. Figure 6 This is a bottom view of a pretreatment fixture for a stainless steel wire annealing furnace used in continuous production operations, as proposed in this invention. Figure 7 This is a schematic diagram of an adjustable elastic support roller structure for a stainless steel wire annealing furnace used in continuous production operations, as proposed in this invention. Figure 8 This is a cross-sectional view of a wiper structure for a stainless steel wire annealing furnace used in continuous production operations, as proposed in this invention. Figure 9 This is a schematic diagram of the cleaning device for a stainless steel wire annealing furnace used in continuous production operations, as proposed in this invention. Figure 10 This is a schematic diagram of a preheating fixture structure for a stainless steel wire annealing furnace used in continuous production operations, as proposed in this invention. Figure 11 This is a schematic diagram of an annealing fixture structure for a stainless steel wire annealing furnace for continuous production operations, as proposed in this invention. Figure 12 This is a bottom view of the annealing fixture structure of a stainless steel wire annealing furnace for continuous production operations proposed in this invention. Figure 13 This is a schematic diagram of the discharge fixture structure of a stainless steel wire annealing furnace for continuous production operations proposed in this invention.

[0022] In the picture: 1. Machine body; 2. Pre-treatment machine box; 3. Preheating machine box; 4. Annealing machine box; 5. Discharge machine box; 6. Pre-processing tooling; 61. Tightening section; 611. Introducing roller; 612. Leading-out roller; 613. Adjustable support roller; 6131. ​​Double-layer bracket; 6132. Lifting threaded rod; 6133. Elastic telescopic rod; 6134. C-shaped support; 6135. Limiting roller; 62. Pickling section; 621. First liquid supply unit; 622, Wiper; 6221, First guide rail; 6222, First movable frame; 6223, First drive gear; 6224, First driven gear; 6225, Radial receiving cavity; 6226, Elastic scraping device; 6227, Driven protrusion; 6228, Automatic telescopic device; 6229, Concentric disc; 62210, Crescent protrusion; 63. Cleaning Department; 631. Second Liquid Supply Unit; 632. Cleaning device; 6321. Second guide rail; 6322. Second movable frame; 6323. Semi-circular arc plate; 6324. Combined track; 6325. Ultrasonic cleaner; 7. Preheating fixture; 71. Load-bearing panel; 72. Second drive gear; 73. Guide arc hole; 74. Incomplete gear; 75. Electric heating element; 8. Annealing fixture; 81. Mixing section; 811. Air supply unit; 812. Drive cylinder; 813. Sealing component; 814. Traction link; 815. Closing component; 82. Dual heat source section; 821. Traction swing arm; 822. T-shaped turntable; 823. C-shaped swing frame; 824. Microwave generator; 825. Plasma generator; 826. Graphite nozzle; 827. Sandpaper polishing part; 828. First temperature controller; 829. Second temperature controller; 9. Unloading fixture; 91. Water mist radiator; 92. Laser ultrasonic detector. Detailed Implementation

[0023] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments.

[0024] Reference Figures 1-13A stainless steel wire annealing furnace for continuous production includes a body 1 that conveys single bundles of steel wire from left to right. The body 1 is equipped with a pretreatment chamber 2, a preheating chamber 3, an annealing chamber 4, and a discharge chamber 5. The body 1 also includes pretreatment fixtures 6, 7, 8, and 9, which are located within the pretreatment chambers 2, 3, 4, and 5. It should be noted that a release roller for releasing the single bundle of steel wire is located at the left end of the body 1, and a take-up roller for pulling the single bundle of steel wire is located at the right end. The two rollers work together to allow the single bundle of steel wire to be annealed to pass through the pretreatment chamber 2, preheating chamber 3, annealing chamber 4, and discharge chamber 5 in a step-by-step manner, sequentially undergoing purification pretreatment, preheating treatment, annealing treatment, and discharge treatment. When batch operations are required, grooves for placing multiple single bundles of steel wires are set in the pretreatment box 2, preheating box 3, annealing box 4, and discharge box 5 to avoid confusion and contact between them, so that multiple single bundles of steel wires can be processed in parallel.

[0025] The pretreatment box 2 is located at the left end of the machine body 1, and the pretreatment box 2 is used to house the pretreatment fixture 6. A single bundle of steel wire is introduced through the wire feeding port on the left side. The pretreatment fixture 6 is used to tension and support the single bundle of steel wire, and at the same time, it is subjected to pickling and ultrasonic cleaning to ensure the cleanliness of the oxide layer contaminants. The pretreated single bundle of steel wire is then horizontally conveyed out of the pretreatment box 2 from the wire feeding port on the right side.

[0026] The preheating chamber 3 is located on the right side of the pretreatment chamber 2, and the preheating chamber 3 is used to house the preheating fixture 7. A single bundle of steel wire is introduced through the wire feeding port on the left side, and the preheating fixture 7 is used to heat the pretreated single bundle of steel wire, so that the temperature of the single bundle of steel wire rises to 500-800℃. The preheated single bundle of steel wire is then horizontally conveyed out of the preheating chamber 3 from the wire feeding port on the right side.

[0027] The annealing chamber 4 is located to the right of the preheating chamber 3, and the annealing chamber 4 is used to house the annealing fixture 8. A single bundle of steel wire is introduced through the wire feeding port on the left side. By inputting a mixed protective gas into the annealing chamber 4, the single bundle of steel wire under the mixed protective gas condition is further heated, so that the single bundle of steel wire is heated to 1050-1100℃ under the heating action of the heat source. The discharge box 5 is located on the right side of the annealing box 4 and at the right end of the machine body 1. The discharge fixture 9 is located in the discharge box 5. The discharge fixture 9 is used to cool and inspect the annealed single bundle of steel wire. Tonghua performs a cooling treatment on the annealed single bundle of steel wire to rapidly reduce the temperature of the single bundle of steel wire to 400℃ in order to facilitate further cooling. At the same time, it performs a structural integrity inspection to determine the annealing quality of the single bundle of steel wire.

[0028] The pretreatment fixture 6 consists of a tensioning part 61, an acid pickling part 62, and a cleaning part 63. The tensioning part 61 is used to support the single bundle of steel wires in an M-shaped structure and keep them taut. The acid pickling part 62 is used to soften the oxide layer on the surface of the single bundle of steel wires. The cleaning part 63 is used to ultrasonically clean the dirt on the surface of the single bundle of steel wires.

[0029] The tensioning section 61 includes an inlet roller 611, an outlet roller 612, and an adjustable support roller 613. The inlet roller 611 is located on the left side of the pretreatment machine box 2, and the outlet roller 612 is located in the middle of the pretreatment machine box 2. It should be noted that the inlet roller 611 and the outlet roller 612 are horizontally aligned to support the single bundle of steel wires to pass horizontally through the wire feeding port.

[0030] The adjustable support roller 613 is located between the inlet roller 611 and the outlet roller 612. The adjustable support roller 613 includes a double-layer bracket 6131, a lifting threaded rod 6132, an elastic telescopic rod 6133, a U-shaped support 6134, and a limiting roller 6135. The double-layer bracket 6131 is fixedly installed on the pretreatment machine box 2, and the lifting threaded rod 6132 is threadedly installed on the double-layer bracket 6131. ​​By driving the lifting threaded rod 6132 to rotate, the height position of the limit roller 6135 can be adjusted in a wide range.

[0031] The elastic telescopic rod 6133 is slidably connected to the lifting threaded rod 6132. The elastic telescopic rod 6133 is composed of a T-shaped rod and a strong spring. Under the tension of the strong spring, it supports the limiting roller 6135 to maintain a downward movement trend.

[0032] The U-shaped support 6134 is rotatably mounted on the elastic telescopic rod 6133; The limiting roller 6135 is rotatably mounted on the U-shaped support 6134. It is worth noting that the limiting roller 6135 is lower than the height of the lead-in roller 611 and the lead-out roller 612, so as to shape the single bundle of steel wire into an M-shaped structure.

[0033] It should be noted that by installing miniature tension sensors on the release roller or take-up roller and connecting them to the controller, the controller adjusts the rotation of the lifting threaded rod 6132 in real time via a servo motor, so that the tension of a single bundle of steel wire is stabilized at 5-10mN, thus preventing slack or stretching.

[0034] Pickling unit 62 includes a first liquid supply device 621 and a wiper 622: The first liquid feeder 621 is used to supply the pretreatment chamber 2 with a pickling mixture consisting of 10% nitric acid, 15% hydrofluoric acid, and 75% purified water. The proportions of these three components refer to their mass percentages. The pretreatment chamber 2 is equipped with feed tanks for nitric acid, hydrofluoric acid, and purified water to facilitate mixing. Through the oxidative dissolution of nitric acid and the film-breaking effect of hydrofluoric acid, the oxide scale and impurities on the surface of the stainless steel wire to be annealed can be effectively removed, providing a clean substrate for annealing. Wherein: As a strong oxidizing agent, nitric acid primarily dissolves the oxide layer on the metal substrate of stainless steel, while simultaneously inhibiting the risk of hydrogen embrittlement through oxidation. Furthermore, nitric acid oxidizes free iron on the metal surface, preventing its residue from forming corrosion pits, and also maintains the acidic environment of the solution, enhancing overall reactivity. Hydrofluoric acid reacts with chromium and silicon to form soluble fluorides, thereby breaking down the protective effect of the chromium oxide film and ensuring complete removal of the oxide scale. Simultaneously, hydrofluoric acid has a moderate dissolving effect on the passivation film on stainless steel surfaces, creating conditions for subsequent re-passivation after annealing. Pure water is used as a solvent to adjust the concentration, avoiding excessive acidity that could lead to an overly vigorous reaction, while also reducing the introduction of impurities and preventing pitting corrosion on the stainless steel surface.

[0035] The wiper 622 uses an acid pickling mixture to dynamically wipe a single bundle of steel wires. The wiper 622 includes a first guide rail 6221, a first moving frame 6222, a first drive gear 6223, a first driven gear 6224, a radial receiving cavity 6225, an elastic scraping device 6226, a driven protrusion 6227, an automatic telescopic device 6228, a concentric disc 6229, and a crescent-shaped protrusion 62210. The first guide rail 6221 is fixedly installed in the pre-processing chassis 2 in a left-right direction, and the first moving frame 6222 is slidably installed on the first guide rail 6221. It should be noted that the first moving frame 6222 is equipped with a driver to realize linear reciprocating movement in the left-right direction. The first drive gear 6223 is rotatably mounted in the first movable frame 6222, and the first movable frame 6222 is provided with a first motor for driving the first drive gear 6223 to rotate. The first driven gear 6224 is rotatably mounted on the first movable frame 6222, and the first driven gear 6224 is meshed with the first drive gear 6223; The number of radial receiving cavities 6225 is set to two, and the two radial receiving cavities 6225 are circumferentially equidistantly opened in the first driven gear 6224. It can also be increased to 4-6. The pickling mixture delivered by the first liquid supply device 621 enters the radial receiving cavity 6225 to wet the elastic scraping device 6226, so that the single bundle of steel wire can be pickled by means of the elastic scraping device 6226.

[0036] The elastic scraping device 6226 is movably installed in the radial receiving cavity 6225. Under the support of the first moving frame 6222, the elastic scraping device 6226 moves in a spiral motion to perform acid pickling and wiping cleaning around the single bundle of steel wire.

[0037] The driven protrusion 6227 is integrally connected to one end of the elastic scraping device 6226 located within the radial receiving cavity 6225; The automatic telescopic device 6228 is mounted on the first driven gear 6224. There are two automatic telescopic devices 6228. The first driven gear 6224 is used as the fulcrum to drive the concentric disk 6229 to deflect and adjust, so that the concentric disk 6229 deflects and adjusts according to the position of the first moving frame 6222, thereby adjusting the distance between the elastic friction device 6226 and the single bundle of steel wire.

[0038] The concentric disc 6229 is rotatably mounted on the first driven gear 6224, and the concentric disc 6229 is connected to the output pin of the automatic telescoping device 6228.

[0039] The crescent-shaped protrusion 62210 is integrally connected to the concentric disk 6229, and the crescent-shaped protrusion 62210 slides against the driven protrusion 6227. It is worth noting that when the first moving frame 6222 moves from right to left, the concentric disk 6229 drives the elastic scraping device 6226 to extend outward from the radial receiving cavity 6225 and contact the single bundle of steel wires; conversely, the elastic scraping device 6226 retracts inward from the radial receiving cavity 6225 to separate from the single bundle of steel wires.

[0040] The cleaning unit 63 includes a second liquid supply unit 631, a cleaner 632, a second guide rail 6321, a second movable frame 6322, a semi-circular arc plate 6323, a combined track 6324, and an ultrasonic cleaner 6325. The second liquid supply unit 631 is used to supply deionized water into the pretreatment unit 2, which is equipped with a deionized water supply tank.

[0041] Cleaner 632 includes: The second guide rail 6321 is fixedly installed in the pretreatment housing 2 along the front and back direction. The second moving frame 6322 is slidably installed on the second guide rail 6321. The second moving frame 6322 is equipped with a driver so that the second moving frame can move and adjust along the front and back direction.

[0042] The semi-circular plate 6323 is integrally connected to the second movable frame 6322, and the combined track 6324 is integrally connected to the semi-circular plate 6323. The two semi-circular structures of the semi-circular plate 6323 and the combined track 6324 can be combined to form a complete ring structure to provide a ring running track for the ultrasonic cleaner 6325, so that the ultrasonic cleaner 6235 can rotate around the single bundle of steel wire. The ultrasonic cleaner 6325 uses deionized water to dynamically rinse the single bundle of steel wires. The ultrasonic cleaner 6325 is slidably installed on the combined track 6324. The ultrasonic cleaner 6325, together with deionized water, performs high-frequency rinsing and purification on the acid-washed single bundle of steel wires to further improve the cleanliness of the single bundle of steel wires and provide a clean single bundle of steel wire substrate for the preheating and annealing processes.

[0043] The preheating fixture 7 includes a load-bearing panel 71, a second drive gear 72, a guide arc hole 73, an incomplete gear 74, and an electric heating element 75. The load-bearing panel 71 is fixedly installed inside the preheating chamber 3, and the second drive gear 72 is rotatably installed on the load-bearing panel 71. It should be noted that the load-bearing panel 71 is equipped with a second motor for driving the second drive gear 72 to rotate periodically.

[0044] The guide arc hole 73 is formed in the load-bearing panel 71; The incomplete gear 74 is rotatably mounted on the load-bearing panel 71 through the guide arc hole 73, and the incomplete gear 74 is meshed with the second drive gear 72. Under the action of meshing transmission, the incomplete gear 74 performs a reversible bidirectional deflection motion. Driven by the incomplete gear 74, the semi-circular electric heating element 75 deflects around the single bundle of steel wire to bake and heat the single bundle of steel wire from all directions.

[0045] The electric heating element 75 is used to heat the pretreated single bundle of steel wire to 500-800℃, and the electric heating element 75 is fixedly installed on the incomplete gear 74.

[0046] The annealing fixture 8 includes a mixing gas section 81 and a dual heat source section 82. The mixing gas section 81 is used to create a mixed protective gas environment consisting of 70% nitrogen, 5% hydrogen and 25% argon. The proportions of the three materials mentioned above refer to their volume proportions. The dual heat source section 82 consists of a traction swing rod 821, a T-shaped turntable 822, a C-shaped swing frame 823, a microwave generator 824, a plasma generator 825, a graphite nozzle 826, a sandpaper polishing part 827, a first temperature controller 828 and a second temperature controller 829. The microwave generator 824 and the plasma generator 825 are used to heat the interior and surface of the single bundle of steel wires respectively in the mixed protective gas environment until the temperature of the single bundle of steel wires reaches 1050-1100℃.

[0047] The mixing unit 81 includes an air supply unit 811, a drive cylinder 812, and a sealing element 813. The gas supply unit 811 is used to supply mixed protective gas into the annealing chamber 4. It should be noted that the annealing chamber 4 is equipped with nitrogen, hydrogen and argon cylinders. By inputting a certain amount of nitrogen, hydrogen and argon into the annealing chamber 4 to form a mixed protective gas, it helps to further inhibit oxidation and promote carbide dissolution. Through gas ratio optimization, the amount of hydrogen is reduced while ensuring reducing properties, and no explosion-proof equipment is required. This helps to make the surface finish comparable to that of a pure hydrogen atmosphere.

[0048] The drive cylinder 812 is fixedly installed in the annealing machine housing 4; There are two sealing components 813. The two sealing components 813 are slidably installed on the inner wall of the annealing machine box 4 corresponding to the wire feeding ports. The sealing component 813 is connected to the output end of the drive cylinder 812 by a traction rod 814 through a pin shaft. A closing component 815 is installed on the sealing component 813 through a pin shaft. It should be noted that both sealing components 813 and closing components 815 are made of silicone material. They are provided with high-pressure micropores for graphite permeation. By combining sealing components 813 and closing components 815, a ring structure is formed that is movably fitted onto the single bundle of steel wire but can block the two wire feeding ports on the annealing machine box 4. At the same time, graphite is sprayed into the single bundle of steel wire through the high-pressure micropores to form a thin and brittle graphite coating.

[0049] The traction lever 821 is rotatably mounted in the annealing machine housing 4, and traction elongated holes are provided at both ends of the traction lever 821. There are two T-shaped turntables 822, both rotatably mounted in the annealing machine housing 4, and each T-shaped turntable 822 has an eccentrically positioned traction bolt that is movably fitted into the traction elongated hole. See the attached instruction manual for details. Figure 11 With appendix Figure 12 The annealing chamber 4 is equipped with a third motor for driving the traction swing arm 821 to deflect. Under the traction of the traction swing arm 821, the two T-shaped turntables 822 deflect synchronously.

[0050] There are two C-shaped pendulum frames 823. The two C-shaped pendulum frames 823 are fixedly installed on two T-shaped turntables 822 respectively. It should be noted that the two C-shaped pendulum frames 823 are arranged in parallel. During the deflection process, the microwave generator 824 and the plasma generator 825 are deflected in a counterclockwise or clockwise direction to a horizontal state, and the single bundle of steel wire is heated in the process. The microwave generator 824 is fixedly mounted on both ends of a U-shaped pendulum frame 823 located on the left side. It should be noted that the microwaves penetrate the surface of the single bundle of steel wire, causing the internal atoms to vibrate at high frequency and generate heat, resulting in volume heating at a rate of 50℃ / s. The microwave resonant cavity design uses a cylindrical resonant cavity with gold plating on the inner wall to help reduce energy loss. The mode converter concentrates the microwave energy on the wire path, which helps to improve the energy utilization rate to 85%. The plasma generator 825 is fixedly installed on both ends of another C-shaped swing frame 823 located on the right side. It should be noted that the plasma provides a surface heat source, specifically generated by the ionization of argon / hydrogen gas, with a temperature of 5000-8000K. The plasma is confined within a 5mm range on the surface of a single bundle of steel wire using a magnetic control coil to avoid high-temperature damage to the furnace body.

[0051] To further explain: the power of the two heat sources is balanced by a PID algorithm, specifically by a combination of 60% microwave and 40% plasma, to ensure that the surface and inside of a single bundle of steel wire are at the same temperature, or to control the temperature difference between the core and surface of a single bundle of steel wire to be ≤5℃.

[0052] The graphite nozzle 826 is fixedly mounted on a closure 813 located on the left side. By forming a thin, brittle graphite coating on the single bundle of steel wires, it helps enhance microwave energy absorption and improve heating efficiency during microwave heating. Stainless steel is a good conductor and strongly reflects microwaves, while graphite is an excellent microwave absorbing material with a unique layered structure and conjugated electron system. It can efficiently absorb microwave energy through dielectric and resistive losses, converting electromagnetic energy into heat energy. Furthermore, the graphite coating forms a continuous and uniform film on the surface of the single bundle of steel wires, eliminating uneven energy absorption caused by differences in substrate surface conditions. It can quickly diffuse the absorbed microwave heat throughout the coating and then uniformly transfer it to the single bundle of steel wire substrate through heat conduction, avoiding localized overheating or underheating. Simultaneously, the graphite coating has lower conductivity than metals and excellent charge dispersion capabilities. The coating can cover the sharp edges or defects of the single bundle of steel wires, reducing localized charge accumulation and lowering the risk of tip discharge. Even if localized energy concentration occurs, the high heat resistance of the graphite coating can buffer thermal shocks, preventing direct damage to the single bundle of steel wire substrate and ensuring the safety and stability of the microwave heating process. More importantly, another advantage of graphite coating is that it facilitates subsequent cleaning. The graphite coating can be removed by pickling, sandblasting, or high-temperature burning without leaving impurities on the surface of the single bundle of steel wire, thus avoiding adverse effects on the mechanical properties or corrosion resistance of the single bundle of steel wire.

[0053] The sandpaper polishing component 827 is fixedly installed in the middle of the annealing machine box 4. The sandpaper polishing component 827 is used to scrape and clean the graphite coating on the single bundle of steel wires so that the plasma generator 825 can heat the single bundle of steel wires.

[0054] The first temperature controller 828, corresponding to the microwave generator 824, is located in the annealing chamber 4, and the second temperature controller 829, corresponding to the plasma generator 825, is also located in the annealing chamber 4. Further explanation: The actual temperature of each bundle of steel wire is collected in real time by a contact or non-contact sensor and compared with a preset annealing temperature threshold to ensure that the temperature remains stable within the target range. This avoids temperature deviations caused by power fluctuations or coordination errors of the two heat sources, ensuring the consistency of hardness and elongation performance in each batch of single bundles of steel wire. Synchronous coordination between the first temperature controller 828 and the second temperature controller 829 achieves the following: Real-time monitoring of the temperature change trend of a single bundle of steel wires, specifically manifested in the control of heating rate and temperature stability during the heat preservation stage; The temperature signal is converted into control commands to adjust the power of microwave generator 824 and plasma generator 825 separately or in tandem.

[0055] By using a feedback mechanism between temperature and power, the heating characteristics of the two heat sources can be balanced to achieve stable heating, heat preservation, and cooling curves. It is preferable to arrange multiple temperature sensors at different positions of a single bundle of steel wire or in different areas of the same cross section to collect temperature distribution data in real time.

[0056] The microwave generator 824 and the plasma generator 825 are arranged from left to right. The graphite nozzle 826 is located to the left of the microwave generator 824, and the sandpaper polishing part 827 is located between the microwave generator 824 and the plasma generator 825.

[0057] The unloading fixture 9 includes a water mist radiator 91 and a laser ultrasonic detector 92. The water mist radiator 91 is used to cool the annealed single bundle of steel wires to 400℃. The laser ultrasonic detector 92 is used to test the structural integrity of the cooled single bundle of steel wires. It uses laser-excited ultrasonic waves on the surface of the single bundle of steel wires, analyzes the echo signals to obtain the internal grain structure and residual stress, and the detection speed is synchronized with the running speed of the single bundle of steel wires. It can provide real-time feedback on whether the process requirements are met. If the requirements are exceeded, the equipment is immediately stopped for adjustment to avoid batch scrapping. Further explanation: This is achieved through a combination of technologies. An ultrasonic probe emits longitudinal waves to detect internal cracks and defects. Eddy current coils are used to detect pits and scratches on the surface and near the surface.

[0058] The pretreatment chamber 2, preheating chamber 3, annealing chamber 4, and discharge chamber 5 all have wire feeding ports on their left and right side walls for passing through single bundles of steel wire. It should be noted that by setting the wire feeding ports on the same horizontal line, single bundles of steel wire can be conveyed linearly through the wire feeding ports.

[0059] The electric heating element 75 has a semi-circular structure; please refer to the instruction manual for details. Figure 10It should be noted that the single bundle of steel wires is dynamically wrapped by the electric heating element 75 with an opening, and heated by electricity.

[0060] It should be noted that the specific models and specifications of the first motor, second motor, third motor, servo motor, automatic telescopic device 6228, ultrasonic cleaner 6325, electric heating element 75, drive cylinder 812, microwave generator 824, plasma generator 825, first temperature controller 828, second temperature controller 829, water mist radiator 91, and laser ultrasonic detector 92 need to be selected and determined according to the actual specifications of the device. The specific selection and calculation method adopts the existing technology in this field, so it will not be elaborated here.

[0061] The functional principle of this invention can be explained through the following operational methods: The single bundle of steel wires is passed from left to right through the pretreatment box 2, the preheating box 3, the annealing box 4, and the discharge box 5.

[0062] First, the adjustable support roller 613 is raised, lowered, extended, and retracted to maintain the single bundle of steel wires in a taut state for horizontal conveying. This is achieved by adjusting the lifting threaded rod 6132, which causes the limiting roller 6135 to press down on the single bundle of steel wires. Acid pickling solution is then supplied to the wiper 622 via the first liquid supply device 621. The wiper 622 then cleans the oxide layer and oil stains from the surface of the single bundle of steel wires. Deionized water is then supplied to the ultrasonic cleaner 6325 via the second liquid supply device 631. The ultrasonic cleaner 6325 then rinses the cleaned single bundle of steel wires. The pickling mixture entering the radial cavity 6225 wets the elastic scraping device 6226. The concentric disk 6229 is driven to deflect by the automatic telescoping device 6228. The crescent-shaped protrusion 62210 applies pressure to the driven protrusion 6227. The elastic scraping device 6226 extends out of the radial cavity 6225 to contact the single bundle of steel wire. During the left-right translation and rotation process, the surface of the single bundle of steel wire is dynamically scrubbed. Then, the ultrasonic cleaner 6325 sprays deionized water onto the single bundle of steel wire and rinses the single bundle of steel wire in high-frequency vibration.

[0063] Secondly, the electric heating element 75 is used to dynamically heat the washed single bundle of steel wire to 500-800℃. The electric heating element 75 is controlled to generate heat by being energized. The electric heating element 75 is reciprocated by 300° by the meshing transmission between the second drive gear 72 and the incomplete gear 74 to heat the single bundle of steel wire.

[0064] Then, a mixed protective gas is introduced into the annealing chamber 4 using the gas supply device 811. The two wire feeding ports in the annealing chamber 4 are sealed using the sealing member 813 and the closing member 815. That is, the mixed protective gas is introduced into the annealing chamber 4 through the gas supply device 811, and the wire feeding ports on the annealing chamber 4 are sealed using the lowered sealing member 813 and the closing member 815. A graphite coating is sprayed onto the preheated single bundle of steel wire using a graphite nozzle 826. Finally, the interior of the single bundle of steel wire is heated using a microwave generator 824. The graphite coating on the surface of the microwave-heated single bundle of steel wire is wiped clean using sandpaper polishing part 827. Then, the surface of the single bundle of steel wire is heated to 1050-1100℃ using plasma generator 825. The traction swing arm 821 drives the two T-shaped turntables 822 to deflect periodically, so that the C-shaped swing frame 823 drives the microwave generator 824 and plasma generator 825 to deflect synchronously, so as to heat the internal and surface parts of the single bundle of steel wire separately.

[0065] Finally, the annealed single bundle of steel wire is controlled to pass through the discharge box 5, and the discharge fixture 9 is used to perform water mist cooling and structural integrity testing on the single bundle of steel wire, so that the temperature of the single bundle of steel wire drops rapidly to 400℃, and then it is allowed to dissipate heat to room temperature through static heat dissipation. Finally, the single bundle of steel wire is subjected to flaw detection by a laser ultrasonic testing instrument 92.

[0066] The above description is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. A stainless steel wire annealing furnace for continuous production operations, comprising a body (1) for conveying a single bundle of steel wire from left to right, characterized in that, Also includes: The pretreatment fixture (6) includes an acid pickling section (62), which includes a first liquid feeder (621) and an elastic scraping device (6226). The first liquid feeder (621) supplies the elastic scraping device (6226) with an acid pickling mixture consisting of 10% nitric acid, 15% hydrofluoric acid and 75% pure water. The acid pickling section (62) cleans the oxide layer on the surface of the single bundle of steel wire by means of the elastic scraping device (6226) which is immersed in the acid pickling mixture. Preheating fixture (7) heats the pretreated single bundle of steel wire to 500-800℃; Annealing fixture (8) includes a mixed gas section (81) and a dual heat source section (82). The mixed gas section (81) includes a gas supply unit (811), which is used to supply a mixed protective gas formed by mixing 70% nitrogen, 5% hydrogen and 25% argon. The dual heat source section (82) consists of a microwave generator (824), a plasma generator (825), a graphite nozzle (826) and a sandpaper polishing part (827). In the mixed protective environment, the microwave generator (824) first heats the interior of the preheated single bundle of steel wire to 1050-1100°C, and the plasma generator (825) then heats the surface of the preheated single bundle of steel wire to 1050-110°C.

2. The stainless steel wire annealing furnace for continuous production operation according to claim 1, characterized in that, The body (1) is provided with: Pre-processing chassis (2), the pre-processing chassis (2) is located at the left end of the machine body (1), and the pre-processing chassis (2) is used to house the pre-processing fixture (6). The preheating box (3) is located on the right side of the pretreatment box (2), and the preheating box (3) is used to house the preheating fixture (7). Annealing chamber (4), which is located to the right of preheating chamber (3), and is used to house annealing fixture (8). The discharge box (5) is located on the right side of the annealing box (4) and on the right end of the machine body (1). The discharge box (5) is equipped with a discharge fixture (9) for cooling and detecting the single bundle of steel wire after annealing.

3. The stainless steel wire annealing furnace for continuous production operation according to claim 2, characterized in that, The pretreatment box (2), preheating box (3), annealing box (4) and discharge box (5) are all provided with wire feeding ports for passing through single bundles of steel wires on their left and right side walls.

4. The stainless steel wire annealing furnace for continuous production operation according to claim 3, characterized in that, The pretreatment fixture (6) also includes a tightening section (61) and a cleaning section (63): The fastening part (61) includes an inlet roller (611), an outlet roller (612), and an adjustable support roller (613). The inlet roller (611) is located on the left side of the pretreatment box (2), the outlet roller (612) is located in the middle of the pretreatment box (2), and the adjustable support roller (613) is located between the inlet roller (611) and the outlet roller (612). The cleaning unit (63) includes a second liquid supply device (631) and an ultrasonic cleaner (6325). The second liquid supply device (631) is used to supply deionized water to the ultrasonic cleaner (6325), which uses deionized water to rinse the acid-washed single bundle of steel wires at high frequency.

5. The stainless steel wire annealing furnace for continuous production operation according to claim 4, characterized in that, The first liquid supply device (621) is located above the elastic scraping device (6226).

6. The stainless steel wire annealing furnace for continuous production operation according to claim 5, characterized in that, The number of elastic scraping devices (6226) is two, and the two elastic scraping devices (6226) move spirally from right to left around the single bundle of steel wire to pickle the oxide layer on the surface of the single bundle of steel wire.

7. The stainless steel wire annealing furnace for continuous production operation according to claim 6, characterized in that, The preheating fixture (7) includes an electric heating element (75), which is a semi-circular structure.

8. The stainless steel wire annealing furnace for continuous production operation according to claim 7, characterized in that, The mixed gas section (81) includes a sealing member (813), and there are two sealing members (813). The two sealing members (813) are slidably installed on the inner wall of the annealing machine box (4) corresponding to the wire feeding port, and a closing member (815) is installed on the sealing member (813) by a pin.

9. A stainless steel wire annealing furnace for continuous production operation according to claim 8, characterized in that, The microwave generator (824) and plasma generator (825) are arranged from left to right, the graphite nozzle (826) is located to the left of the microwave generator (824), and the sandpaper polishing part (827) is located between the microwave generator (824) and the plasma generator (825).

10. A method of using a stainless steel wire annealing furnace for continuous production operations as described in claim 9, characterized in that, The method of use includes the following steps: Step S1: Pass the single bundle of steel wires from left to right through the pretreatment box (2), preheating box (3), annealing box (4) and discharge box (5). Step S2: Control the adjustable support roller (613) to lift, extend and retract to keep the single bundle of steel wires taut during transport. Acid pickling mixture is supplied to the elastic scraping device (6226) through the first liquid supply device (621). The elastic scraping device (6226) is then used to scrub the oxide layer on the surface of the single bundle of steel wires. Deionized water is supplied to the ultrasonic cleaner (6325) through the second liquid supply device (631). The ultrasonic cleaner (6325) is used to rinse the oil stains on the single bundle of steel wires. Step S3: Dynamically heat the rinsed single bundle of steel wire to 500-800℃ using an electric heating element (75); Step S4: Use the gas supply device (811) to input mixed protective gas into the annealing chamber (4), use the graphite nozzle (826) to spray a graphite coating onto the preheated single bundle of steel wire, use the microwave generator (824) to heat the inside of the single bundle of steel wire to 1050-1100°C, use the sandpaper polishing part (827) to wipe and clean the graphite coating on the surface of the microwave-heated single bundle of steel wire, and use the upper plasma generator (825) to heat the surface of the single bundle of steel wire to 1050-1100°C. Step S5: Control the annealed single bundle of steel wires to pass through the discharge box (5), and use the discharge fixture (9) to perform water mist cooling and structural integrity testing on the single bundle of steel wires.

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