A multifunctional high-speed wire online salt bath tank and its usage method

Abstract

The present invention specifically relates to a multifunctional high-speed wire online salt bath tank and its usage method, including an upper bath tank, a lower bath tank, a conveying roller table, a spray pipeline system, a molten salt pump, a high-temperature salt storage tank, a low-temperature salt storage tank, and a molten salt cooling evaporator. A high-temperature salt molten salt pump is arranged in the high-temperature salt storage tank, and the high-temperature salt molten salt pump is connected to the high-temperature salt spray pipeline system to form a high-temperature molten salt loop. A low-temperature salt molten salt pump is arranged in the low-temperature salt storage tank, and the low-temperature salt molten salt pump is connected to the low-temperature salt spray pipeline system to form a low-temperature molten salt loop. The molten salt cooling evaporator is connected to the low-temperature salt storage tank through a pipeline. Determine whether to use the high-temperature molten salt loop, the low-temperature molten salt loop, or both loops simultaneously according to the required salt bath temperature T; determine the spray pipeline system to be opened and the corresponding molten salt pump according to the salt bath time t, the cooling rate μ, the distance Li between each group of spray pipeline systems and the outlet of the coiler, and the speed ν of the conveying roller table; start the molten salt pump to inject the salt solution into the upper bath tank to cool the wire rod.

Description

Technical Field

[0001] The present invention relates to the technical field of steel rolling in the metallurgical industry, and particularly to a multifunctional high-speed wire online salt bath tank and its usage method. Background Technique

[0002] Before, during, or after cold working steel materials into final products, heat treatment is often required to endow the materials with good processing properties or to enable the products to meet the final use properties. For example, high-carbon steel wires need to undergo lead bath heat treatment before or during cold drawing to obtain a uniform and consistent sorbite microstructure; standard parts need to undergo annealing heat treatment before cold drawing to improve cold forming ability, and need to undergo quenching and tempering heat treatment after processing to improve strength and plasticity; low-carbon alloy steel wire rod needs to undergo annealing treatment before or between passes of drawing to improve cold drawing processing performance, etc. Under the dual pressures of reducing manufacturing costs and energy conservation, emission reduction, and carbon reduction in the industry, manufacturers generally have an urgent need for heat treatment-free processes, which requires steel raw materials to obtain good initial tissue properties through controlled rolling and controlled cooling according to the process characteristics of downstream manufacturers and the final performance of the products.

[0003] At present, the post-rolling cooling of steel wire rod production lines often uses roller conveyors combined with the opening and closing of fans and heat preservation covers to obtain different cooling rates, so as to meet the cooling process requirements of high, medium, and low-carbon steels. However, the produced materials cannot fully meet the requirements of heat treatment-free processing. Especially when producing high-grade products, there are disadvantages such as large performance fluctuations and instability. Compared with fan cooling, molten salt baths have the advantages of high thermal conductivity, uniform cooling by impregnation, and stable temperature, and are widely used in the isothermal sorbitization treatment of high-carbon steel for the production of lead-bath heat treatment-free drawn high-strength high-carbon steel wire rod. However, there is no solution for online salt bath tanks for other online heat treatment requirements such as isothermal quenching and quenching-partition heat treatment processes for medium and low-carbon steels. Summary of the Invention

[0004] The purpose of the present invention is to provide a multifunctional high-speed wire online salt bath tank and its usage method to solve the problems raised in the above background technique.

[0005] To achieve the above object, the present invention provides the following technical solutions: A multifunctional high-speed wire online salt bath tank includes an upper bath tank, a lower bath tank, a conveying roller table, a spray pipeline system, and a molten salt pump. The upper bath tank is arranged above the lower bath tank. The conveying roller table is laid in the upper bath tank along the length direction of the upper bath tank. The molten salt pump is connected to the spray pipeline system. The spray pipeline system is arranged above the upper bath tank. The molten salt pump is arranged outside the lower bath tank. It also includes a high-temperature salt storage tank, a low-temperature salt storage tank, and a molten salt cooling evaporator. The spray pipeline system is divided into a high-temperature salt spray pipeline system and a low-temperature salt spray pipeline system. The molten salt pump is divided into a high-temperature salt molten salt pump and a low-temperature salt molten salt pump. The high-temperature salt molten salt pump is arranged in the high-temperature salt storage tank. The high-temperature salt molten salt pump is connected to the high-temperature salt spray pipeline system through a pipeline to form a high-temperature molten salt loop. The low-temperature salt molten salt pump is arranged in the low-temperature salt storage tank. The low-temperature salt molten salt pump is connected to the low-temperature salt spray pipeline system through a pipeline to form a low-temperature molten salt loop. The molten salt cooling evaporator is connected to the low-temperature salt storage tank through a pipeline.

[0006] Preferably, it further includes a molten salt heater, which is respectively arranged inside the high-temperature salt storage tank and the low-temperature salt storage tank, and the number of molten salt heaters inside the high-temperature salt storage tank is more than that of the molten salt heaters inside the low-temperature salt storage tank.

[0007] Preferably, it further includes a low-temperature salt return pump, which is arranged inside the lower bath tank and is connected to the low-temperature salt storage tank through a pipeline.

[0008] Preferably, the high-temperature salt spray pipeline system and the low-temperature salt spray pipeline system are arranged at intervals above the upper bath tank.

[0009] Preferably, a plurality of salt discharge valves are arranged at the bottom of the upper bath tank.

[0010] Preferably, a movable baffle is arranged inside the lower bath tank.

[0011] Preferably, it further includes a high-temperature salt return pump, which is arranged inside the lower bath tank and is connected to the high-temperature salt storage tank through a pipeline.

[0012] The present invention also provides a method for using a multifunctional high-speed wire online salt bath tank, and the method is as follows: According to the chemical composition of the wire to be produced, the required microstructure and mechanical properties, determine the salt bath temperature T, the salt bath time t, and the cooling rate μ from the CCT and TTT curves of the steel; determine whether to use the high-temperature molten salt circuit, the low-temperature molten salt circuit, or both circuits according to the required salt bath temperature T; determine the spray pipe system to be opened and the corresponding molten salt pump according to the salt bath time t, the cooling rate μ, the distance Li between each group of spray pipe systems and the outlet of the coiler, and the conveying roller table speed ν; start the molten salt pump, inject the salt solution into the upper bath tank through the pipeline and the spray pipe system to cool the wire, start the conveying roller table, the coiler starts to spin the wire, the coil falls on the conveying roller table, is conveyed through the upper bath tank by the conveying roller table, and is collected into finished products by the coiling station after online heat treatment is completed.

[0013] Preferably, after cooling the wire, the method further includes the step of adjusting the opening degree of the salt discharge valve to form a certain liquid level height of the salt solution in the upper bath tank.

[0014] Preferably, after adjusting the opening degree of the salt discharge valve, the method further includes starting the low-temperature salt return pump and / or the high-temperature salt return pump, and returning the salt solution in the lower bath tank to the low-temperature salt storage tank and / or the high-temperature salt storage tank through the pipeline. Since the temperature of the salt solution returned to the low-temperature salt storage tank increases after heat exchange with the wire, at this time, start the molten salt pump for cooling to inject the salt solution into the molten salt cooling evaporator through the pipeline for cooling, and the cooled salt solution returns to the low-temperature salt storage tank to maintain the constant temperature of the salt solution.

[0015] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0016] By flexibly selecting the spraying positions of the high-temperature and low-temperature salt solutions, parameters such as the salt bath temperature, the wire cooling rate, and the time can be accurately controlled in segments, so as to meet the requirements of various high-speed wire online heat treatment processes such as isothermal sorbitization heat treatment, quenching-partitioning heat treatment, bainite isothermal quenching, and step quenching for high, medium, and low carbon steels and alloy steels. Description of the Drawings

[0017] Figure 1 It is a schematic structural diagram of the multifunctional high-speed wire online salt bath tank for Examples 1-4;

[0018] Figure 2 It is a diagram showing the relationship between the wire salt bath time and temperature for Example 2;

[0019] Figure 3 It is a diagram showing the relationship between the wire salt bath time and temperature for Example 3;

[0020] Figure 4 It is a diagram showing the relationship between the wire salt bath time and temperature for Example 4.

[0021] In the figure: upper bath 1, lower bath 2, conveying roller table 3, high-temperature salt storage tank 4, low-temperature salt storage tank 5, molten salt cooling evaporator 6, high-temperature salt spraying pipeline system 7, low-temperature salt spraying pipeline system 8, high-temperature salt molten salt pump 9, low-temperature salt molten salt pump 10, high-speed wire laying machine 11, molten salt heater 12, low-temperature salt salt return pump 13, high-temperature salt salt return pump 14, salt discharge valve 15, movable baffle 16. Detailed implementation mode

[0022] In order to clearly and completely describe the purpose, technical solution of the present invention and make the advantages more clear, the following further details the embodiments of the present invention with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are part of the embodiments of the present invention, rather than all of the embodiments, and are only used to explain the embodiments of the present invention, not to limit the embodiments of the present invention. All other embodiments obtained by those of ordinary skill in the art without creative efforts belong to the scope of protection of the present invention.

[0023] Embodiment 1

[0024] Please refer to Figure 1, this embodiment provides a multi-functional high-speed wire online salt bath tank, which is used for various process applications such as isothermal quenching of sorbitization, isothermal quenching of bainite, quenching-partitioning, and step quenching of high, medium, low carbon steels and alloy steels. The multi-functional high-speed wire online salt bath tank includes an upper bath tank 1, a lower bath tank 2, a conveying roller table 3, a spray pipe system, and a molten salt pump. The upper bath tank 1 is arranged above the lower bath tank 2. The conveying roller table 3 is laid in the upper bath tank 1 along the length direction of the upper bath tank 1. The molten salt pump is connected to the spray pipe system. The spray pipe system is arranged above the upper bath tank 1. The molten salt pump is arranged outside the lower bath tank 2. The spray pipe system includes a spray pipe and spray heads connected thereto. The detailed structures are all prior arts and will not be elaborated. Specifically, it further includes a high-temperature salt storage tank 4, a low-temperature salt storage tank 5, and a molten salt cooling evaporator 6. The spray pipe system is divided into a high-temperature salt spray pipe system 7 and a low-temperature salt spray pipe system 8. The molten salt pump is divided into a high-temperature salt molten salt pump 9 and a low-temperature salt molten salt pump 10. The high-temperature salt molten salt pump 9 is arranged in the high-temperature salt storage tank 4. The high-temperature salt molten salt pump 9 is connected to the high-temperature salt spray pipe system 7 through a pipeline to form a high-temperature molten salt loop. The low-temperature salt molten salt pump 10 is arranged in the low-temperature salt storage tank 5. The low-temperature salt molten salt pump 10 is connected to the low-temperature salt spray pipe system 8 through a pipeline to form a low-temperature molten salt loop. The molten salt cooling evaporator 6 is connected to the low-temperature salt storage tank 5 through a pipeline to form a molten salt cooling loop. The conveying roller table 3 is used to convey wire rods through the salt bath. The line speed of the roller table of the conveying roller table 3 can be adjusted arbitrarily within the range of 0.1 m / s - 1.5 m / s. The front end is connected to the lower dense row roller table of the high-speed wire spinning machine 11, and the rear end is connected to the coiling station and its necessary transition roller tables. The salt liquid introduced into the upper bath tank 1 cools the wire rods conveyed by the conveying roller table 3. The molten salt used for the salt liquid is nitrate, including sodium nitrite, sodium nitrate, and potassium nitrate, and the use temperature is 150 - 600 °C. The temperature of the high-temperature molten salt in the high-temperature salt storage tank 4 is 450 - 600 °C, and the temperature of the low-temperature molten salt in the low-temperature salt storage tank 5 is 150 - 450 °C. In this embodiment, both the high-temperature salt molten salt pump 9 and the low-temperature salt molten salt pump 10 are variable-frequency pumps, and each high-temperature salt molten salt pump 9 and low-temperature salt molten salt pump 10 can be controlled independently, so as to be turned on or off according to the wire rod cooling process requirements.

[0025] As a preferred embodiment of this embodiment, the multi-functional high-speed wire online salt bath tank further includes a molten salt heater 12. The molten salt heaters 12 are respectively arranged inside the high-temperature salt storage tank 4 and the low-temperature salt storage tank 5, and the number of molten salt heaters 12 inside the high-temperature salt storage tank 4 in this embodiment is more than that of the molten salt heaters 12 inside the low-temperature salt storage tank 5.

[0026] As a preferred embodiment of this embodiment, it further includes a low-temperature salt return pump 13 and a high-temperature salt return pump 14. The low-temperature salt return pump 13 is arranged inside the lower bath 2 and is connected to the low-temperature salt storage tank 5 through a pipeline; the high-temperature salt return pump 14 is arranged inside the lower bath 2 and is connected to the high-temperature salt storage tank 4 through a pipeline. Both the low-temperature salt return pump 13 and the high-temperature salt return pump 14 are variable-frequency pumps and can also be controlled separately.

[0027] As a preferred embodiment of this embodiment, the high-temperature salt spray pipeline system 7 and the low-temperature salt spray pipeline system 8 are arranged at intervals above the upper bath 1. In this way of arranging at intervals, the spraying positions of the high-temperature and low-temperature salt solutions can be flexibly selected, and parameters such as the salt bath temperature, wire cooling temperature, and time can be accurately controlled in sections.

[0028] As a preferred embodiment of this embodiment, a plurality of salt discharge valves 15 are arranged at the bottom of the upper bath 1. When the salt discharge valves 15 are opened, the salt solution flows from the upper bath 1 into the lower bath 2 to maintain a certain liquid level height.

[0029] As a preferred embodiment of this embodiment, a movable baffle 16 is arranged inside the lower bath 2. When high-temperature molten salt and low-temperature molten salt are respectively injected on both sides of the movable baffle 16, the position of the movable baffle 16 can be moved to separate the high-temperature molten salt and the low-temperature molten salt.

[0030] This embodiment also provides a usage method of a multifunctional high-speed wire online salt bath. The method is as follows:

[0031] (1) According to the chemical composition of the wire to be produced, the required microstructure and mechanical properties, by referring to literature materials such as manuals, measuring with a thermal dilatometer, or calculating with simulation software such as JMatpro, determine the salt bath temperature T, salt bath time t, and cooling rate μ from the CCT and TTT curves of the steel.

[0032] (2) Determine whether to use the high-temperature molten salt circuit, the low-temperature molten salt circuit, or both circuits simultaneously according to the required salt bath temperature T; generally, only the low-temperature molten salt circuit is required for isothermal quenching below 450°C, and two molten salt circuits need to be used simultaneously for processes with two quenching temperature requirements such as quenching-partitioning or step quenching. For isothermal treatment above 450°C, only the high-temperature molten salt circuit or both circuits can be used simultaneously.

[0033] (3) Determine the spray pipeline system to be opened and the corresponding molten salt pump according to the salt bath time t, cooling rate μ, the distance Li between each group of spray pipeline systems and the outlet of the high-speed wire laying head 11, and the conveying roller table speed ν.

[0034] (4) Start the molten salt pump, inject the salt solution into the upper bath through the pipeline and the spray pipeline system, and cool the wire.

[0035] (5) The brine flows into the lower bath through the brine discharge valve placed at the bottom of the upper bath. Adjust the opening degree of the brine discharge valve to form a certain liquid level height of the brine in the upper bath.

[0036] (6) Start the high-temperature salt return pump and / or the low-temperature salt return pump, and inject the brine in the lower bath back into the high-temperature salt storage tank and / or the low-temperature salt storage tank through pipelines.

[0037] (7) Since the temperature of the brine flowing back to the low-temperature salt storage tank increases after heat exchange with the wire rod, at this time, start the molten salt pump for cooling to inject the brine through the pipeline into the molten salt cooling evaporator for cooling. After cooling, the brine flows back to the low-temperature salt storage tank to maintain the constant temperature of the brine.

[0038] (8) After the above preparations are completed, start the conveying roller table. The high-speed wire laying machine starts to lay wire. The coil falls on the conveying roller table and is conveyed by the conveying roller table through the upper bath. After online heat treatment, it is collected into finished products by the coiling station.

[0039] Example 2

[0040] Refer to Figure 2 , the multifunctional high-speed wire online salt bath and its use method in this example are used for Figure 2 the quenching-partition heat treatment shown. According to the chemical composition of the wire rod to be produced and the required microstructure and properties, by referring to its TTT / CCT curve, determine the quenching temperature as T1, the time as t1, the partitioning temperature as T2, the time as t2, and the total salt bath time as t = t1 + t2. Set the brine temperatures of the low-temperature salt storage tank and the high-temperature salt storage tank as T1 and T2 respectively. The roller speed ν of the conveying roller table ≤ L / t, where L is the distance from the last group of spray pipe systems to the outlet of the high-speed wire laying machine, that is, the total length of the upper bath. Calculate L1 = ν × t1, so as to determine the position of the low-temperature salt spray pipes, and all the low-temperature salt spray pipes before this group of spray pipes need to be opened; calculate L2 = L - ν × t2 to determine the position of the high-temperature salt spray pipe system, and all the high-temperature salt spray pipe systems after this group of high-temperature salt spray pipe systems need to be opened. Start the high-temperature and low-temperature salt molten salt pumps corresponding to the above high- and low-temperature spray pipe systems. After the liquid level of the brine in the upper bath is stable, start the high-speed wire laying machine to start production. The wire rod coil with a temperature of T0 falls on the close-packed roller table of the conveying roller table and is conveyed by the conveying roller table through the low-temperature salt bath section with a temperature of T1 and the high-temperature salt bath section with a temperature of T2 in sequence. After the quenching-partition treatment, it is collected into finished products by the coiling station. In addition, start the high- and low-temperature salt return pumps to make the high- and low-temperature molten salt circuits operate. The flow rates of the high- and low-temperature salt return pumps are the same as the total flow rates of the corresponding high- and low-temperature molten salt pumps opened.

[0041] Example 3

[0042] Refer to Figure 3, the multi-functional high-speed wire online salt bath tank and its usage method in this embodiment are used for Figure 3 The isothermal quenching heat treatment of medium and low carbon carbon steel and alloy steel bainite shown. According to the chemical composition of the wire rod produced and the required microstructure and properties, by referring to its TTT / CCT curve, the quenching temperature is determined to be T1 and the time is t1. Set the salt solution temperature of the low-temperature salt storage tank to T1, and do not use the high-temperature salt storage tank and its molten salt circuit. The roller speed ν of the conveying roller table ≤ L / t1, where L is the total length of the upper bath tank. Turn on all the low-temperature salt molten salt pumps. After the salt solution level in the upper bath tank is stable, turn on the high-speed wire spinning machine to start production. The wire rod coil falls on the closely arranged roller table of the conveying roller table and is conveyed by the conveying roller table through the salt bath at a temperature of T1. After the isothermal quenching treatment is completed, it is collected into finished products by the coiling station. In addition, turn on the low-temperature salt return salt pump to make the low-temperature molten salt circuit operate. The flow rate of the low-temperature salt return salt pump is the same as the total flow rate of the low-temperature salt molten salt pumps turned on.

[0043] , the multi-functional high-speed wire online salt bath tank and its usage method in this embodiment are used for Figure 3 The isothermal quenching heat treatment of high carbon carbon steel and alloy steel sorbite shown. According to the chemical composition of the wire rod produced and the required microstructure and properties, by referring to its TTT / CCT curve, the quenching temperature is determined to be T1 and the time is t1. Set the salt solution temperature of the high-temperature salt storage tank to T1, and do not use the low-temperature salt storage tank and its molten salt circuit. The roller speed ν of the conveying roller table ≤ L / t1, where L is the total length of the upper bath tank. Turn on all the high-temperature salt molten salt pumps. After the salt solution level in the upper bath tank is stable, turn on the high-speed wire spinning machine to start production. The wire rod coil falls on the closely arranged roller table of the conveying roller table and is conveyed by the conveying roller table through the salt bath at a temperature of T1. After the isothermal quenching treatment is completed, it is collected into finished products by the coiling station. In addition, turn on the high-temperature salt return salt pump to make the low-temperature molten salt circuit operate. The flow rate of the high-temperature salt return salt pump is the same as the total flow rate of the high-temperature salt molten salt pumps turned on. This usage method is applicable to wire rods with a diameter ≤ 10 mm.

[0044] Example 4

[0045] Refer to Figure 4 , the multi-functional high-speed wire online salt bath tank and its usage method in this embodiment are used for Figure 4Isothermal quenching heat treatment of high-carbon carbon steel and alloy steel wire rods as shown. This method is applicable to wire rods with a diameter > 10 mm. According to the chemical composition of the wire rods to be produced and the required microstructure and properties, by referring to their TTT / CCT curves, the salt bath temperature is determined to be T2 and the time is t2. The salt solution temperatures of the low-temperature salt storage tank and the high-temperature salt storage tank are set to T1 = 450 °C and T2 = 600 °C respectively. The roll speed ν ≤ L / t2, where L is the total length of the upper bath. It is necessary to turn on the first two groups of low-temperature salt spray pipe systems and the third group and subsequent high-temperature salt spray pipe systems. The main function of the low-temperature molten salt is to rapidly cool the large-sized wire rods to avoid the formation of proeutectoid structures. Turn on the high-temperature and low-temperature salt molten salt pumps corresponding to the above high- and low-temperature spray pipe systems. After the salt solution level in the upper bath is stable, turn on the high-speed wire rod spinning machine to start production. The wire rod coil at a temperature of T0 falls on the closely arranged roller path of the conveying roller path, is rapidly cooled after being sprayed with the low-temperature salt at a temperature of T1, the surface temperature reaches T1, and the core temperature is close to T2. Then, it passes through the high-temperature salt bath section at a temperature of T2, and after the sorbitization treatment, it is collected into finished products by the coiler station. In addition, turn on the high- and low-temperature salt return pumps to make the high- and low-temperature molten salt circuits operate. The flow rates of the high- and low-temperature salt return pumps are the same as the total flow rates of the corresponding high- and low-temperature salt molten salt pumps turned on.

[0046] Although the above-described illustrative specific embodiments of the present application have been described to enable those skilled in the art to understand the present application, the present application is not limited to the scope of the specific embodiments. For those of ordinary skill in the art, as long as various changes are within the spirit and scope of the present application defined and determined by the appended claims, all application creations using the concept of the present application are within the scope of protection.

Claims

1. A method for using a multifunctional high-speed wire online salt bath tank, characterized in that, The described multi-functional high-speed wire online salt bath tank includes an upper bath tank, a lower bath tank, a conveying roller table, a spray pipeline system, a molten salt pump, a high-temperature salt storage tank, a low-temperature salt storage tank, a molten salt cooling evaporator, a low-temperature salt return pump, and a high-temperature salt return pump. The upper bath tank is arranged above the lower bath tank. The conveying roller table is laid in the upper bath tank along the length direction of the upper bath tank. The molten salt pump is connected to the spray pipeline system. The spray pipeline system is arranged above the upper bath tank. The molten salt pump is arranged outside the lower bath tank. The spray pipeline system is divided into a high-temperature salt spray pipeline system and a low-temperature salt spray pipeline system. The molten salt pump is divided into a high-temperature salt molten salt pump and a low-temperature salt molten salt pump. The high-temperature salt molten salt pump is arranged in the high-temperature salt storage tank. The high-temperature salt molten salt pump is connected to the high-temperature salt spray pipeline system through a pipeline to form a high-temperature molten salt loop. The low-temperature salt molten salt pump is arranged in the low-temperature salt storage tank. The low-temperature salt molten salt pump is connected to the low-temperature salt spray pipeline system through a pipeline to form a low-temperature molten salt loop. The molten salt cooling evaporator is connected to the low-temperature salt storage tank through a pipeline. The low-temperature salt return pump is arranged inside the lower bath tank and is connected to the low-temperature salt storage tank through a pipeline. The high-temperature salt spray pipeline system and the low-temperature salt spray pipeline system are arranged at intervals above the upper bath tank. A plurality of salt discharge valves are arranged at the bottom of the upper bath tank. The high-temperature salt return pump is arranged inside the lower bath tank and is connected to the high-temperature salt storage tank through a pipeline; The described method is as follows: According to the chemical composition of the wire rod to be produced, the required microstructure and mechanical properties, the salt bath temperature T, the salt bath time t, and the cooling rate μ are determined from the CCT and TTT curves of the steel. According to the required salt bath temperature T, determine whether to use the high-temperature molten salt loop, the low-temperature molten salt loop, or both loops simultaneously. According to the salt bath time t, the cooling rate μ, the distance Li from each group of spray pipeline systems to the outlet of the coiler, and the speed ν of the conveying roller table, determine the spray pipeline systems to be opened and the corresponding molten salt pumps. Turn on the molten salt pump, inject the salt solution into the upper bath tank through the pipeline and the spray pipeline system to cool the wire rod. Turn on the conveying roller table, the coiler starts to spin the wire, the coil falls on the conveying roller table, is conveyed through the upper bath tank by the conveying roller table, and is collected into finished products by the coiling station after online heat treatment.

2. The method for using the multifunctional high-speed wire online salt bath tank according to claim 1, characterized in that After cooling the wire rod by the described method, it further includes the step of adjusting the opening degree of the salt discharge valve to form a certain liquid level height of the salt solution in the upper bath tank.

3. The usage method of the multifunctional high-speed wire online salt bath tank according to claim 2, characterized in that, After adjusting the opening degree of the salt discharge valve by the described method, it further includes turning on the low-temperature salt return pump and / or the high-temperature salt return pump to return the salt solution in the lower bath tank to the low-temperature salt storage tank and / or the high-temperature salt storage tank through the pipeline. The salt solution returned to the low-temperature salt storage tank has an increased temperature after heat exchange with the wire rod. At this time, turn on the cooling molten salt pump to inject the salt solution into the molten salt cooling evaporator through the pipeline for cooling, and the cooled salt solution returns to the low-temperature salt storage tank to maintain the constant temperature of the salt solution.

4. The method for using the multifunctional high-speed wire online salt bath tank according to claim 1, characterized in that , The described multi-functional high-speed wire online salt bath tank further includes molten salt heaters, which are respectively arranged inside the high-temperature salt storage tank and the low-temperature salt storage tank, and the number of molten salt heaters inside the high-temperature salt storage tank is more than that inside the low-temperature salt storage tank.

5. The method for using the multifunctional high-line online salt bath tank according to claim 1, characterized in that , A movable baffle is arranged inside the lower bath tank.

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