Dual-purpose production unit for deep drawing steel and hot-dip galvanized steel and production method

Abstract

The dual-purpose production unit comprises an inlet section, a process section and an outlet section, the process section comprises a cleaning section, a continuous annealing section, a zinc pot section, an after-plating cooling section, a finishing withdrawal and straightening section and a roller coating post-treatment section which are sequentially arranged in the strip steel production direction, and the zinc pot section is provided with a zinc pot and a zinc pot lifting assembly; the zinc pot lifting assembly drives the zinc pot to ascend and descend, so that the strip steel is immersed in or far away from zinc liquid in the zinc pot, whether the strip steel is galvanized or not is selected, original equipment of other working sections is shared when deep drawing steel or hot-dip galvanized steel is produced, the hot-dip galvanized steel can be produced, and the deep drawing steel can also be produced. And rapid wire cutting can be conducted on the same production unit, deep drawing steel products or hot-dip galvanized steel products can be produced, the problem that products produced by a traditional continuous hot-dip galvanizing unit are single is solved, the requirements of the market for different products can be rapidly responded, and then comprehensive benefits are improved.

Description

Technical Field

[0001] The invention relates to the technical field of metal material production, and in particular to a dual-purpose production unit and a production method for deep-drawn steel and hot-dip galvanized steel. Background Art

[0002] Cold-rolled plain carbon steel is ordinary carbon structural steel produced through cold rolling, and there is a great demand for cold-rolled plain carbon steel in industries such as engineering machinery, trade import and export, and freight.

[0003] Generally, ordinary cold coils or deep drawing steel are produced through carbon steel continuous annealing units, and coated coils or hot-dip galvanized steel are produced through continuous hot-dip galvanizing units. If both materials are in demand, it is necessary to invest in two different units at the same time to produce the corresponding materials, which has high operating costs and occupies a large area.

[0004] At present, the above two materials can be produced by hot-dip galvanizing-continuous annealing dual-purpose units. The process layout is a bypass design, that is, an over-aging section and a secondary cooling section are set in parallel in the hot stretching roller area, so that the dual-purpose unit can not only produce hot-dip galvanized steel, but also deep-drawing steel. However, in the process of producing deep-drawing steel and hot-dip galvanized steel, bypass switching is required, which makes it impossible to quickly cut the line and produce deep-drawing steel products or hot-dip galvanized steel products on the same production unit, and thus it is difficult to quickly respond to market demand for different products. Summary of the invention

[0005] To this end, in order to solve the above-mentioned problems, the present invention provides a dual-purpose production unit and production method for deep drawing steel and hot-dip galvanized steel, which can not only produce hot-dip galvanized steel, but also produce deep drawing steel, and can quickly cut the line and produce deep drawing steel products or hot-dip galvanized steel products on the same production unit, so as to solve the problem of single product produced by traditional continuous hot-dip galvanizing units, and is also conducive to quickly responding to market demand for different products, thereby improving comprehensive benefits.

[0006] To achieve the above purpose, the technical solution provided by the present invention is as follows:

[0007] The present invention provides a dual-purpose production unit for deep-drawing steel and hot-dip galvanized steel, comprising an inlet section, a process section and an outlet section arranged in sequence along the production direction of the strip steel, wherein the inlet section is used to supply the strip steel raw material that is not hot-dip galvanized, and the outlet section is used to coil the strip steel product, and the process section comprises a cleaning section, a continuous annealing section, a zinc pot section, a cooling section after plating, a skin pass stretching section and a roller coating post-treatment section arranged in sequence along the production direction of the strip steel; the zinc pot section is provided with a zinc pot and a zinc pot lifting component, and the zinc pot lifting component drives the zinc pot to rise and fall, so that the strip steel is immersed in or away from the zinc liquid in the zinc pot, so as to select whether to galvanize the strip steel, and the original equipment of the cleaning section, the continuous annealing section, the cooling section after plating, the skin pass stretching section and the roller coating post-treatment section are shared when producing deep-drawing steel or hot-dip galvanized steel, so as to produce the corresponding hot-dip galvanized steel product or deep-drawing steel product on the same production unit.

[0008] Furthermore, the cleaning section is provided with an alkali spray tank, an alkali brush tank, an electrolytic ultrasonic cleaning tank, a hot water brush tank, a rinsing tank and a hot air dryer; the continuous annealing section includes a preheating section, a heating section, a soaking section, a cooling section, a balancing section, an over-aging section and a secondary cooling section arranged in sequence; the zinc pot section is also provided with an air knife, which is arranged above the zinc pot and is respectively located on the upper and lower sides of the strip, and the airflow sprayed by the air knife scrapes the galvanized layer on the surface of the strip to control the thickness of the galvanized layer on the surface of the strip; the post-plating cooling section includes an air cooling section and a water quenching section; the skin-finishing and straightening section is provided with a skin-finishing machine, a post-skin-finishing cleaning component, a post-skin-finishing hot air drying component, a straightening machine and a post-skin-finishing hot air drying component; the roller coating post-treatment section is provided with a roller coating machine and a roller coating post-treatment component.

[0009] Furthermore, the continuous annealing section is provided with a horizontal annealing furnace or a vertical annealing furnace; the strip steel in the furnace is heated by gas heating, electric heating, radiation tube heating or induction heating, and the strip steel in the furnace is cooled by spray cooling, mist cooling or water-cooled roller cooling.

[0010] Furthermore, the cooling medium for the spray cooling and aerosol cooling is nitrogen, hydrogen, inert gas or a mixture thereof, and also serves as a protective gas; the cooling medium for the water-cooled roller cooling is liquid water or pentane.

[0011] Furthermore, the entrance section is provided with an uncoiler, a clamping and straightening assembly, an entrance shear, a welding machine, a crescent shear and an entrance looper; the exit section is provided with an exit looper, an inspection table, an electrostatic oiling assembly, an exit shear and a coiler; an intermediate looper is provided between the post-plating cooling section and the skin-smoothing and straightening section.

[0012] Furthermore, steering rollers, tension rollers and deviation correction rollers are provided between the equipment of the inlet section, the process section and the outlet section to ensure the connection of the strip between the equipment.

[0013] The present invention provides a co-production method of deep-drawn steel and hot-dip galvanized steel, and adopts the dual-purpose production unit of deep-drawn steel and hot-dip galvanized steel to produce deep-drawn steel or hot-dip galvanized steel respectively, comprising the following steps: S1, uncoiling the strip steel at the entrance section, and then sequentially performing clamping straightening and shearing welding; S2, conveying the strip steel obtained in S1 to the process section and first cleaning it, and then sequentially entering the preheating section, heating section, soaking section, cooling section, equalization section, over-aging section and secondary cooling section of a continuous annealing furnace for annealing treatment; S3, immersing the strip steel obtained in S2 into zinc liquid in a zinc pot for hot-dip galvanizing treatment to obtain hot-dip galvanized steel semi-finished product, and the strip steel is driven by a zinc pot lifting component through the zinc pot to ensure that the strip steel is immersed in the zinc liquid in the zinc pot; or directly passing the strip steel obtained in S2 through a zinc pot lifting component. The zinc pot is moved above the zinc pot, and the zinc pot is driven by the zinc pot lifting assembly at this time to keep it away from the steel strip, thereby ensuring that the steel strip does not contact the zinc liquid in the zinc pot, so as to obtain a semi-finished deep-drawn steel product; S4, the hot-dip galvanized steel semi-finished product or deep-drawn steel semi-finished product obtained in S3 is successively subjected to post-plating air cooling and final quenching, and then subjected to skin straightening and roller coating post-treatment; S5, the hot-dip galvanized steel semi-finished product or deep-drawn steel semi-finished product obtained in S4 is successively subjected to inspection, electrostatic oiling and coiling in the exit section, so as to obtain a deep-drawn steel product or a hot-dip galvanized steel product; and when producing deep-drawn steel or hot-dip galvanized steel, the zinc pot is controlled to rise and fall to select whether to galvanize the steel strip, and other original equipment in the process section is shared, so as to produce the corresponding hot-dip galvanized steel product or deep-drawn steel product on the same production unit.

[0014] Furthermore, in S2, the protective gas in the continuous annealing furnace is a nitrogen-hydrogen mixed gas, the oxygen content is ≤50ppm, and the dew point temperature is ≤-40°C; the nitrogen content in the continuous annealing furnace is 30 to 95%; or the hydrogen content in the continuous annealing furnace is 5 to 70%.

[0015] Furthermore, when producing deep-drawn steel products, the inlet temperature of the continuous annealing furnace is 20 to 40°C; the strip outlet temperature of the preheating section is 200 to 280°C; the strip outlet temperature of the heating section is 700 to 920°C; the strip furnace temperature of the soaking section is 750 to 920°C, and the soaking time is at least 30s; the strip outlet temperature of the cooling section is 600 to 700°C; the strip furnace temperature of the aging section is 400 to 500°C, and the soaking time is 60 to 120s; the strip outlet temperature of the aging section is 300 to 400°C; the strip outlet temperature of the secondary cooling section is 150 to 250°C; and the strip is water quenched after the post-plating air cooling.

[0016] Furthermore, when producing hot-dip galvanized products, the inlet temperature of the continuous annealing furnace is 20 to 40°C; the outlet temperature of the strip in the preheating section is 200 to 280°C; the outlet temperature of the strip in the heating section is 750 to 900°C; the furnace temperature of the strip in the soaking section is 750 to 920°C, and the soaking time is at least 30s; the outlet temperature of the strip in the cooling section is 650 to 700°C; the furnace temperature of the strip in the aging section is 350 to 500°C, and the soaking time is 30 to 60s; the temperature of the strip entering the zinc pot is 450 to 500°C; the galvanized strip is air cooled, and water quenched when its temperature drops to 150 to 180°C.

[0017] The technical solution provided by the present invention has the following beneficial effects:

[0018] The zinc pot is driven to rise and fall by the zinc pot lifting assembly, so that the strip steel is immersed in or away from the zinc liquid in the zinc pot, so that the zinc pot can be selected to be put into production, that is, it can be selected whether to galvanize the strip steel, and the original equipment of the cleaning section, the continuous annealing section, the post-plating cooling section, the skin straightening section and the roller coating post-treatment section are shared when producing deep-drawing steel or hot-dip galvanized steel. In this way, through reasonable unit layout and corresponding production methods, not only the production of hot-dip galvanized steel but also the production of deep-drawing steel can be realized, and the line can be quickly cut and deep-drawing steel products or hot-dip galvanized steel products can be produced on the same production unit, so as to solve the problem of single product produced by traditional continuous hot-dip galvanizing units, and it is also conducive to quickly responding to market demand for different products, thereby improving comprehensive benefits. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 Shown is a connection diagram of a dual-purpose production unit for deep drawing steel and hot-dip galvanized steel in an embodiment. DETAILED DESCRIPTION

[0020] To further illustrate the various embodiments, the present invention provides drawings. These drawings are part of the disclosure of the present invention, which are mainly used to illustrate the embodiments and can be used in conjunction with the relevant descriptions in the specification to explain the operating principles of the embodiments. With reference to these contents, a person of ordinary skill in the art should be able to understand other possible implementations and advantages of the present invention. The components in the figures are not drawn to scale, and similar component symbols are generally used to represent similar components.

[0021] The present invention will now be further described with reference to the accompanying drawings and specific implementation methods.

[0022] Reference Figure 1As shown, this embodiment provides a dual-purpose production unit for deep-drawn steel and hot-dip galvanized steel (hereinafter referred to as the production unit), which is used to produce deep-drawn steel products or hot-dip galvanized steel products on the same line, and the production unit includes an entrance section, a process section and an exit section arranged in sequence along the production direction of the strip steel, the entrance section is used to supply the unhot-dip galvanized strip steel raw materials, the exit section is used to coil the strip steel products, the process section includes a cleaning section 5, a continuous annealing section, a zinc pot section, a post-galvanizing cooling section, a skin pass straightening section and a roller coating post-treatment section arranged in sequence along the production direction of the strip steel, wherein the zinc pot section is provided with a zinc pot 13 and a zinc pot lifting assembly, the zinc pot lifting assembly drives the zinc pot 13 to rise and fall, so that the strip steel is immersed in or away from the zinc liquid in the zinc pot 13, so as to select whether to galvanize the strip steel, and the original equipment of the cleaning section 5, the continuous annealing section, the post-galvanizing cooling section, the skin pass straightening section and the roller coating post-treatment section are used in the production of deep-drawn steel or hot-dip galvanized steel, and then the corresponding hot-dip galvanized steel products or deep-drawn steel products are produced on the same production unit.

[0023] In this embodiment, the entrance section is provided with an uncoiler 1, a clamping and straightening assembly, an entrance shear 2, a welder 3, a crescent shear and an entrance looper 4, and the entrance shear 2, the welder 3 and the crescent shear cooperate to achieve shearing and welding of the strip.

[0024] The exit section is provided with an exit looper 22, an inspection table 23, an electrostatic oiling assembly 24, an exit shear 25 and a coiler 26. An intermediate looper 17 is provided between the post-plating cooling section and the skin-finishing and straightening section. Steering rollers, tension rollers and deviation correction rollers are provided between the equipment in the entry section, process section and exit section to ensure the connection of the strip between the equipment.

[0025] More specifically, the cleaning section 5 is provided with an alkaline spray tank, an alkaline brush tank, an electrolytic ultrasonic cleaning tank, a hot water brush tank, a rinsing tank and a hot air dryer, and the feed port of the cleaning section 5 is connected to the discharge port of the inlet loop 4, and physical and chemical methods are used to clean the surface of the strip to remove impurities such as oil, iron powder and the like on the surface of the strip.

[0026] The continuous annealing section includes a preheating section 6, a heating section 7, a soaking section 8, a cooling section 9, a balance section 10, an over-aging section 11 and a secondary cooling section 12, which are arranged in sequence to achieve heat treatment of the strip, thereby improving the microstructure of the strip and enhancing the mechanical properties of the strip.

[0027] The zinc pot section is also provided with an air knife 14, which is arranged above the zinc pot 13 and respectively located on the upper and lower sides of the strip. The airflow ejected by the air knife 14 scrapes the galvanized layer on the surface of the strip to control the thickness of the galvanized layer on the surface of the strip. Of course, the zinc pot section is also equipped with conventional equipment such as a furnace nose section, a zinc ingot loading mechanism, a zinc ash extraction mechanism and a humidification mechanism.

[0028] By setting the zinc pot section in the next section of the continuous annealing section, the zinc in the zinc pot 13 is melted, and the temperature of the molten zinc liquid is maintained by the control system of the production unit, thereby ensuring that the zinc liquid is plated on the surface of the strip.

[0029] The post-plating cooling section includes an air cooling section 15 and a water quenching section 16 equipped with a water quenching device. The air cooling of the air cooling section 15 cools the strip to the temperature required by the process, and ensures that the zinc coating solidified at the temperature required by the process will not stick to the top roller of the post-plating cooling section, and then continues to cool to the temperature required for water quenching. Of course, the post-plating cooling section can also be equipped with a post-plating tower top zinc scale removal mechanism.

[0030] The skin-finishing and straightening section is provided with a skin-finishing machine 18, a post-skinning cleaning component, a post-skinning hot air drying component, a straightening machine 19 and a post-skinning hot air drying component. At this time, the skin-finishing and straightening section is arranged in the next section of the cooling section after plating. After the strip is skin-finished by the skin-finishing machine 18, the mechanical properties of the strip can be improved, the strip shape can be improved, and the surface roughness of the strip can be adjusted. Then the skin-finished strip enters the straightening machine 19 for continuous stretching, bending and straightening of the strip to eliminate the strip's edge wave, middle wave, scoop and other plate defects, thereby improving the straightness of the strip, so as to obtain a strip that meets the use requirements and finally realize plate shape regulation.

[0031] The roller coating post-processing section is provided with a roller coating machine 20 and a roller coating post-processing assembly 21. At this time, the roller coating post-processing section is arranged at the next section of the skin-smoothing and straightening section. The roller coating machine 20 is used to coat a layer of protective film on the surface of the strip after the galvanizing layer. Then, it is dried by the roller coating post-processing assembly 21, that is, by spraying high-speed hot air on the surface of the strip to dry and passivate the moisture remaining on the surface of the strip. Then, it is cooled by the roller coating post-processing assembly 21 to cool the strip to 45°C to complete the entire roller coating post-processing of the strip.

[0032] The zinc pot 13 is driven to rise and fall by the zinc pot lifting assembly, so that the strip steel is immersed in or away from the zinc liquid in the zinc pot 13, so as to select whether the zinc pot 13 is put into production, that is, it is possible to select whether to galvanize the strip steel, and the original equipment of the cleaning section 5, the continuous annealing section, the post-plating cooling section, the skin straightening section and the roller coating post-treatment section are shared when producing deep-drawing steel or hot-dip galvanized steel. In this way, through reasonable unit layout and corresponding production methods, not only the production of hot-dip galvanized steel but also the production of deep-drawing steel can be realized, and the line can be quickly cut and deep-drawing steel products or hot-dip galvanized steel products can be produced on the same production unit, so as to solve the problem of single product produced by traditional continuous hot-dip galvanizing units, and it is also conducive to quickly responding to market demand for different products, thereby improving comprehensive benefits.

[0033] In addition, the production unit of this embodiment can save the initial equipment investment of the unit, effectively reduce the total floor space, and meet the process requirements of both ordinary cold-rolled plate production and coated plate production, thereby improving the operating rate and flexibility of the production unit of this embodiment.

[0034] In another preferred embodiment, the continuous annealing section is provided with a horizontal annealing furnace, and the horizontal annealing furnace is provided with a preheating section 6, a heating section 7, a soaking section 8, a cooling section 9, a balancing section 10, an over-aging section 11 and a secondary cooling section 12.

[0035] The strip steel in the furnace is heated by gas heating, electric heating, radiant tube heating or induction heating, and is cooled by spray cooling or mist cooling.

[0036] Of course, in other embodiments, a vertical annealing furnace may be used instead, or a water-cooled roller cooling method may be used to cool the strip in the furnace, and the cooling medium of the water-cooled roller cooling is liquid water or pentane, etc.

[0037] In another preferred embodiment, the cooling medium for spray cooling and mist cooling is a nitrogen-hydrogen mixed gas formed by a mixture of nitrogen and hydrogen, and acts as a protective gas.

[0038] Of course, the cooling medium of air cooling can also be nitrogen, hydrogen, inert gas or a mixture thereof.

[0039] In addition, in this specific embodiment, the production unit of this embodiment is used to produce deep-drawn steel or hot-dip galvanized steel according to the following co-production method of deep-drawn steel and hot-dip galvanized steel, which specifically includes the following steps:

[0040] Step S1, uncoiling the steel strip at the entrance section through the uncoiling machine 1, and then pinching and straightening it in turn through the pinching and straightening assembly, and shearing and welding it through the cooperation of the entrance shear 2, the welding machine 3 and the crescent shear.

[0041] Step S2, after the steel strip obtained in step S1 is transported to the process section, it is first cleaned through the cleaning section 5, and then enters the preheating section 6, heating section 7, soaking section 8, cooling section 9, equalization section 10, over-aging section 11 and secondary cooling section 12 of the continuous annealing furnace in sequence for annealing treatment.

[0042] Step S3, when hot-dip galvanized steel products need to be produced, the steel strip obtained in step S2 is immersed in the zinc liquid in the zinc pot 13 for hot-dip galvanizing treatment to obtain hot-dip galvanized steel semi-finished products, and the zinc pot 13 is driven by the zinc pot lifting assembly to ensure that the steel strip is immersed in the zinc liquid in the zinc pot 13.

[0043] When deep-drawn steel products need to be produced, the steel strip obtained in step S2 is directly passed over the zinc pot 13, and the zinc pot 13 at this time is driven by the zinc pot lifting assembly to keep it away from the steel strip, thereby ensuring that the steel strip does not contact the zinc liquid in the zinc pot 13, so as to obtain deep-drawn steel semi-finished products, that is, in the process section, the steel strip passes through the cleaning section 5, the continuous annealing section where the continuous annealing furnace is located, the zinc pot section, the post-plating cooling section, the skin straightening section and the roller coating post-treatment section in sequence, and the steel strip only passes through the zinc pot section, and the galvanizing equipment in the zinc pot section is not put into actual production.

[0044] Step S4, the hot-dip galvanized steel semi-finished product or deep-drawn steel semi-finished product obtained in step S3 is successively passed through the air cooling section 15 for post-galvanizing air cooling, and through the water quenching section 16 for final quenching, and then passed through the skin-smoothing and straightening section for skin-smoothing and straightening, and passed through the roller coating post-treatment section for roller coating post-treatment.

[0045] Step S5, the hot-dip galvanized steel semi-finished product or deep-drawn steel semi-finished product obtained in step S4 is sequentially inspected on the inspection table 23 of the exit section, electrostatically oiled by the electrostatic oiling assembly 24, and coiled by the coiler 26 to obtain a deep-drawn steel product or a hot-dip galvanized steel product.

[0046] When deep-drawn steel or hot-dip galvanized steel is produced, the zinc pot 13 is controlled to rise and fall to select whether to galvanize the strip steel, and other original equipment in the process section is shared, so that the corresponding hot-dip galvanized steel products or deep-drawn steel products are produced on the same production unit.

[0047] In step S2 of another preferred embodiment, the oxygen content in the nitrogen-hydrogen mixed gas in the continuous annealing furnace is ≤50ppm, the dew point temperature is ≤-40°C, and the nitrogen content in the continuous annealing furnace is 30 to 95% to coordinate the heating and cooling in the continuous annealing furnace and to form gas protection for the steel strip.

[0048] Of course, in other embodiments, the hydrogen content in the continuous annealing furnace may also be 5 to 70%.

[0049] In step S3 of another preferred embodiment, when deep-drawn steel products are produced, the inlet temperature of the continuous annealing furnace is 20 to 40°C, the strip outlet temperature of the preheating section 6 is 200 to 280°C, the strip outlet temperature of the heating section 7 is 700 to 920°C, the strip furnace temperature of the soaking section 8 is 750 to 920°C, the soaking time of the soaking section 8 is at least 30s, the strip outlet temperature of the cooling section 9 is 600 to 700°C, the strip furnace temperature of the over-aging section 11 is 400 to 500°C, and the soaking time of the over-aging section 11 is 60 to 120s, the strip outlet temperature of the over-aging section 11 is 300 to 400°C, the strip outlet temperature of the secondary cooling section 12 is 150 to 250°C, and the strip is water quenched after air cooling after plating, so that the heat treatment effect of the deep-drawn steel products can be guaranteed.

[0050] When producing hot-dip galvanized products, the inlet temperature of the continuous annealing furnace is 20 to 40°C, the strip outlet temperature of the preheating section 6 is 200 to 280°C, the strip outlet temperature of the heating section 7 is 750 to 900°C, the strip furnace temperature of the soaking section 8 is 750 to 920°C, the soaking time of the soaking section 8 is at least 30s, the strip outlet temperature of the cooling section 9 is 650 to 700°C, the strip furnace temperature of the aging section 11 is 350 to 500°C, the soaking time of the aging section 11 is 30 to 60s, the temperature of the strip entering the zinc pot 13 is 450 to 500°C, the galvanized strip is air cooled, and water quenching is performed when the temperature drops to 150 to 180°C, so as to ensure the heat treatment effect of the hot-dip galvanized products.

[0051] Although the present invention has been specifically shown and described in conjunction with the preferred embodiments, it should be understood by those skilled in the art that various changes may be made to the present invention in form and details without departing from the spirit and scope of the present invention as defined by the appended claims, all of which are within the scope of protection of the present invention.

Claims

1. A dual-purpose production unit for deep drawing steel and hot-dip galvanized steel, comprising an inlet section, a process section and an outlet section arranged in sequence along the strip production direction, wherein the inlet section is used to supply un-hot-dip galvanized strip steel raw materials, and the outlet section is used to coil the strip steel products, characterized in that: The process section includes a cleaning section, a continuous annealing section, a zinc pot section, a post-plating cooling section, a skin-passing and straightening section, and a roller coating post-treatment section, which are arranged in sequence along the strip production direction; The zinc pot section is provided with a zinc pot and a zinc pot lifting assembly, and the zinc pot lifting assembly drives the zinc pot to rise and fall, so that the strip steel is immersed in or away from the zinc liquid in the zinc pot, so as to select whether to galvanize the strip steel, and when producing deep-drawn steel or hot-dip galvanized steel, the original equipment of the cleaning section, the continuous annealing section, the post-plating cooling section, the skin-smoothing and straightening section and the roller coating post-treatment section are shared, and then the corresponding hot-dip galvanized steel products or deep-drawn steel products are produced on the same production unit.

2. The dual-purpose production unit for deep drawing steel and hot-dip galvanized steel according to claim 1, characterized in that: The cleaning section is provided with an alkali spray tank, an alkali brush tank, an electrolytic ultrasonic cleaning tank, a hot water brush tank, a rinsing tank and a hot air dryer; the continuous annealing section includes a preheating section, a heating section, a soaking section, a cooling section, a balancing section, an over-aging section and a secondary cooling section arranged in sequence; the zinc pot section is also provided with an air knife, which is arranged above the zinc pot and is respectively located on the upper and lower sides of the strip, and the airflow sprayed by the air knife scrapes the galvanized layer on the surface of the strip to control the thickness of the galvanized layer on the surface of the strip; the post-plating cooling section includes an air cooling section and a water quenching section; the skin-passing and straightening section is provided with a skin-passing machine, a post-skin-passing cleaning component, a post-skin-passing hot air drying component, a straightening machine and a post-skin-passing hot air drying component; the roller coating post-treatment section is provided with a roller coating machine and a roller coating post-treatment component.

3. The dual-purpose production unit for deep drawing steel and hot-dip galvanized steel according to claim 2, characterized in that: The continuous annealing section is provided with a horizontal annealing furnace or a vertical annealing furnace; the strip steel in the furnace is heated by gas heating, electric heating, radiation tube heating or induction heating, and the strip steel in the furnace is cooled by spray cooling, mist cooling or water-cooled roller cooling.

4. The dual-purpose production unit for deep drawing steel and hot-dip galvanized steel according to claim 3, characterized in that: The cooling medium for the spray cooling and aerosol cooling is nitrogen, hydrogen, inert gas or a mixed gas thereof, and is also used as a protective gas; the cooling medium for the water-cooled roller cooling is liquid water or pentane.

5. The dual-purpose production unit for deep drawing steel and hot-dip galvanized steel according to any one of claims 1 to 4, characterized in that: The entrance section is provided with an uncoiler, a clamping and straightening assembly, an entrance shear, a welding machine, a crescent shear and an entrance looper; the exit section is provided with an exit looper, an inspection table, an electrostatic oiling assembly, an exit shear and a coiler; an intermediate looper is provided between the post-plating cooling section and the skin-smoothing and straightening section.

6. The dual-purpose production unit for deep drawing steel and hot-dip galvanized steel according to any one of claims 1 to 4, characterized in that: Steering rollers, tension rollers and deviation-correcting rollers are arranged between the equipments of the inlet section, the process section and the outlet section to ensure the connection of the strip between the equipments.

7. A method for producing deep-drawn steel and hot-dip galvanized steel on the same line, wherein the deep-drawn steel and hot-dip galvanized steel dual-purpose production unit according to any one of claims 1 to 6 is used to produce deep-drawn steel or hot-dip galvanized steel respectively, characterized in that: The steps include: S1, uncoiling the strip steel at the entrance section, followed by pinch straightening and shear welding; S2, the strip steel obtained in S1 is transported to the process section and cleaned first, and then sequentially enters the preheating section, heating section, soaking section, cooling section, equalization section, over-aging section and secondary cooling section of the continuous annealing furnace for annealing treatment; S3, immersing the steel strip obtained in S2 into the zinc liquid in the zinc pot for hot-dip galvanizing treatment to obtain hot-dip galvanized steel semi-finished products, and the steel strip is driven by the zinc pot lifting component through the zinc pot to ensure that the steel strip is immersed in the zinc liquid in the zinc pot; or the steel strip obtained in S2 is directly passed over the zinc pot, and the zinc pot at this time is driven by the zinc pot lifting component to keep it away from the steel strip, thereby ensuring that the steel strip does not contact the zinc liquid in the zinc pot, to obtain deep-drawn steel semi-finished products; S4, the hot-dip galvanized steel semi-finished product or deep-drawn steel semi-finished product obtained in S3 is subjected to post-galvanizing air cooling and final quenching in sequence, and then subjected to skin straightening and roller coating post-treatment; S5, the hot-dip galvanized steel semi-finished product or deep-drawn steel semi-finished product obtained in S4 is successively inspected, electrostatically oiled and coiled in the exit section to obtain deep-drawn steel products or hot-dip galvanized steel products; and when producing deep-drawn steel or hot-dip galvanized steel, the zinc pot is controlled to be raised and lowered to select whether to galvanize the strip steel, and other original equipment in the process section is shared, so as to produce corresponding hot-dip galvanized steel products or deep-drawn steel products on the same production unit.

8. The method for co-producing deep-drawn steel and hot-dip galvanized steel according to claim 7, characterized in that: In S2, the protective gas in the continuous annealing furnace is a nitrogen-hydrogen mixed gas, the oxygen content is ≤50ppm, and the dew point temperature is ≤-40°C; the nitrogen content in the continuous annealing furnace is 30 to 95%; or the hydrogen content in the continuous annealing furnace is 5 to 70%.

9. The method for co-producing deep-drawn steel and hot-dip galvanized steel according to claim 7 or 8, characterized in that: When producing deep-drawn steel products, the inlet temperature of the continuous annealing furnace is 20 to 40°C; the strip outlet temperature of the preheating section is 200 to 280°C; the strip outlet temperature of the heating section is 700 to 920°C; the strip furnace temperature of the soaking section is 750 to 920°C, and the soaking time is at least 30s; the strip outlet temperature of the cooling section is 600 to 700°C; the strip furnace temperature of the aging section is 400 to 500°C, and the soaking time is 60 to 120s; the strip outlet temperature of the aging section is 300 to 400°C; the strip outlet temperature of the secondary cooling section is 150 to 250°C; the strip is water quenched after the post-plating air cooling.

10. The method for producing deep-drawn steel and hot-dip galvanized steel on the same line according to claim 7 or 8, characterized in that: When producing hot-dip galvanized products, the inlet temperature of the continuous annealing furnace is 20 to 40°C; the outlet temperature of the strip in the preheating section is 200 to 280°C; the outlet temperature of the strip in the heating section is 750 to 900°C; the furnace temperature of the strip in the soaking section is 750 to 920°C, and the soaking time is at least 30s; the outlet temperature of the strip in the cooling section is 650 to 700°C; the furnace temperature of the strip in the aging section is 350 to 500°C, and the soaking time is 30 to 60s; the temperature of the strip entering the zinc pot is 450 to 500°C; the galvanized strip is air cooled, and water quenched when its temperature drops to 150 to 180°C.

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