Painting and galvanizing two-in-one packaging steel belt production system

Abstract

The invention relates to a painting and galvanizing two-in-one packaging steel belt production system. Comprising an uncoiler, a shearing butt welding machine, a front storage loop, a front traction tension roller set, a longitudinal shearing slitting machine, a deburring machine, an oil and rust removal two-in-one cleaning device, a continuous annealing furnace, a bright annealing furnace, a zinc pot, an air knife, a multi-stage air cooling and water cooling device, a passivation device, an integrated washing device, a first drying device, a sealing device and a second drying device which are sequentially arranged. The device comprises a zinc pot, a waxing device, a third drying device, a code spraying device, a rear traction tension roller set, a rear storage loop and a winding device, and the zinc pot can be set to be in a rising state and a falling state so as to control a steel belt to be subjected to zinc immersion or not to be subjected to zinc immersion; the oil and rust removal two-in-one cleaning device, the continuous annealing furnace, the bright annealing furnace, the passivation device, the sealing device, the first drying device and the second drying device have an operating state or a closed state. The device can be switched between the painting process and the galvanizing process, and the reuse rate of all public devices is increased.

Description

Technical Field

[0001] The invention relates to the technical field of production of steel strips for packaging, and in particular to a two-in-one production line for painting and hot-dip galvanizing steel strips for packaging and a production method thereof. Background Art

[0002] There are differences between the painting process and the hot-dip galvanizing process of packaging steel strips. Therefore, the existing packaging painted (blued) steel strip production line and packaging hot-dip galvanized steel strip production line are independent of each other. The packaging painted (blued) steel strip production line cannot produce hot-dip galvanized steel strips, and the packaging hot-dip galvanized steel strip production line cannot paint (blued) steel strips. When the production capacity of a single steel strip variety has not reached full load, the production line will be idle.

[0003] There is an urgent need for a production system that can flexibly switch between painting and galvanizing steel strip for packaging. Summary of the invention

[0004] In order to solve the above problems, the present invention provides a two-in-one painted and galvanized steel strip production system for packaging, comprising: an uncoiler, a shearing and welding machine, a front storage looper, a front traction tension roller group, a longitudinal shearing and slitting machine, a deburring machine, a two-in-one cleaning device for degreasing and rust removal, a continuous annealing furnace, a bright annealing furnace, a zinc pot, an air knife, a multi-stage air-cooling and water-cooling device, a passivation device, an integrated water washing device, a first drying device, a closing device, a second drying device, a wax coating device, a third drying device, a coding device, a rear traction tension roller group, a rear storage looper, and a winding device, wherein the zinc pot can be set to a raised state and a lowered state to control whether the steel strip is galvanized or not; the two-in-one cleaning device for degreasing and rust removal, the continuous annealing furnace, the bright annealing furnace, the passivation device, the closing device, the first drying device, and the second drying device have two states of operation or shutdown.

[0005] According to one embodiment of the present invention, in the two-in-one painted and galvanized steel strip production system for packaging, the front storage loop is a vertical storage loop; and the rear storage loop is a spiral storage loop.

[0006] According to one embodiment of the present invention, a plurality of supporting rollers are arranged between the front traction tension roller group and the rear traction tension roller group, and the plurality of supporting rollers carry the steel belt and are arranged to allow the steel belt to pass through the device between the front traction tension roller group and the rear traction tension roller group.

[0007] According to one embodiment of the present invention, a hydraulic cylinder and a sliding rod are provided at the bottom of the zinc pot, and the hydraulic cylinder is connected to the sliding rod to support the zinc pot so that the zinc pot can be raised or lowered.

[0008] According to one embodiment of the present invention, the hydraulic cylinder and the sliding rod are provided in plurality and are evenly distributed on the bottom of the zinc pot.

[0009] According to one embodiment of the present invention, the two-in-one cleaning device for degreasing and rust removal is provided with a cleaning liquid injection and discharge valve for controlling the liquid level of the cleaning liquid in the two-in-one cleaning device for degreasing and rust removal.

[0010] According to one embodiment of the present invention, the continuous annealing furnace, the bright annealing furnace, the passivation device, the first drying device, and the second drying device are operated or closed by turning the power on and off.

[0011] According to one embodiment of the present invention, the bright annealing furnace, zinc pot, air knife, integrated water washing device and first drying device are controlled in an interlocking manner.

[0012] According to one embodiment of the present invention, the sealing device has two states: containing paint liquid and containing sealing agent, and can be switched between the two states.

[0013] According to one embodiment of the present invention, the passivation device has two states: containing the passivation liquid and discharging the passivation liquid, and can be switched between the two states.

[0014] By using the present invention, some devices can be freely switched to the running or closed state, so that the two-in-one painting and galvanizing steel strip production system for packaging can switch between the painting and galvanizing processes, thereby improving the reuse rate of various public devices and allowing flexible switching of products. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] By reading the following detailed description with reference to the accompanying drawings, the above and other objects, features and advantages of the exemplary embodiments of the present invention will become readily understood. In the accompanying drawings, several embodiments of the present invention are shown in an exemplary and non-limiting manner, and the same or corresponding reference numerals represent the same or corresponding parts, wherein:

[0016] Figure 1 A schematic diagram of a production line for pre-treating a steel strip according to the present invention is shown;

[0017] Figure 2 A schematic diagram of a portion of a production line including a zinc pot is shown;

[0018] Figure 3 a schematic diagram showing a portion of a production line including a closure device; and

[0019] Figure 4 A schematic diagram of a zinc pot is shown. DETAILED DESCRIPTION

[0020] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the present invention.

[0021] It should be understood that the terms "include" and "comprises" used in the description and claims of the present invention indicate the presence of described features, wholes, steps, operations, elements and / or components, but do not exclude the presence or addition of one or more other features, wholes, steps, operations, elements, components and / or collections thereof.

[0022] It should also be understood that the terms used in this specification of the present invention are only for the purpose of describing specific embodiments and are not intended to limit the present invention. As used in the specification of the present invention and the claims, the singular forms of "a", "an" and "the" are intended to include the plural forms unless the context clearly indicates otherwise. It should also be further understood that the term "and / or" used in the specification of the present invention and the claims refers to any combination of one or more of the associated listed items and all possible combinations, and includes these combinations.

[0023] The specific embodiments of the present invention are described in detail below with reference to the accompanying drawings.

[0024] The paint-coated and galvanized two-in-one packaging steel strip production system provided by the present invention comprises: Figures 1 to 3 The various sections of the production line are shown.

[0025] The starting point of the steel belt is Figure 1 The final position of the unwinder 1 is Figure 3 The winding device 23 in the embodiment of the present invention.

[0026] After the steel strip is cut from the uncoiler 1 and processed by the welding machine 2, it enters Figure 1 The front storage looper 3 in the middle. Figure 1 The front storage looper 3 and Figure 3 The tension degree of the material is controlled by the front traction tension roller group 4 and the rear traction tension roller group 21 between the rear storage loop 22, and the material moves on multiple supporting rollers between the front traction tension roller group 4 and the rear traction tension roller group 21, passing through each processing equipment in turn.

[0027] Figure 1 A schematic diagram of a production line for pre-treating a steel strip is shown.

[0028] like Figure 1As shown, the painted and galvanized two-in-one packaging steel strip production system includes: an unwinding machine 1, a shearing and welding machine 2, a front storage looper 3, a front traction tension roller group 4, a longitudinal shearing and slitting machine 5, and a deburring machine 6 which are arranged in sequence.

[0029] Figure 1 In the figure, the steel belt is represented by a dotted line, and its running direction is restricted by the supporting rollers.

[0030] The uncoiler 1 is a device for carrying raw steel coils, and the shearing and welding machine 2 is a device for welding after cutting and aligning the ends of the steel strip. Figure 1 The vertical material storage loop shown is a device that provides time for the non-stop welding operation of the previous process. The front traction tension roller group 4 is a device that provides traction for the steel strip, the longitudinal shearing and slitting machine 5 is a device that longitudinally shears and slits the steel strip into a specified width, and the deburring machine 6 is a device that removes excess burrs on the shearing surface.

[0031] According to one embodiment of the present invention, the structure of the front traction tension roller group 4 is a roller system composed of three rubber-coated rollers, which is driven by a torque motor. The steel belt runs in an S shape in the roller system, and the friction between the steel belt and the rollers is used to pull the steel belt, and tension is established with the rear traction tension roller group 21. The tension is controlled by the torque motor and the PLC system.

[0032] According to an embodiment of the present invention, the deburring machine 6 uses four squeezing rollers arranged on both sides of the steel strip to squeeze the four corners of the steel strip respectively, thereby flattening the burrs on the edges.

[0033] The raw steel coil is set on the unwinder 1, and the front traction tension roller group 4 provides traction. When connecting different cold-rolled coils, the shearing and welding machine 2 is required to cut the head and tail of the steel strip and align them before welding. At this time, a vertical storage looper needs to be added to provide buffer time. Then, it enters the longitudinal shearing and slitting machine 5 to be longitudinally sheared into steel strips of specified width, and enters the deburring machine 6 to remove excess burrs on the shearing surface.

[0034] Figure 2 A schematic diagram of a portion of a production line including a zinc pot is shown.

[0035] like Figure 2 As shown, the degreasing and rust removing two-in-one cleaning device 7 is connected to Figure 1 Deburring machine 6.

[0036] Figure 2 The utility model comprises a two-in-one cleaning device for degreasing and derusting 7, a continuous annealing furnace 8, a bright annealing furnace 9, a zinc pot 10, an air knife 11, and a multi-stage air-cooling and water-cooling device 12.

[0037] The steel strip degreasing and rust removal two-in-one cleaning device 7 is a device for removing oil and rust stains on the surface of the steel strip. According to one embodiment of the present invention, the steel strip degreasing and rust removal two-in-one cleaning device 7 is a tank-shaped device, which is provided with a cleaning liquid for degreasing and rust removal, and controls the steel strip to move below the liquid level in the tank, and removes oil and rust by immersion during the moving process.

[0038] The continuous annealing furnace 8 is a heat treatment device for annealing the steel strip, adjusting the mechanical properties of the steel strip, reducing the strength and increasing the elongation. According to one embodiment of the present invention, the continuous annealing furnace is a semi-enclosed structure, and the steel strip is heated to the required temperature when passing through the furnace chamber, and the surface of the steel strip is oxidized to blue.

[0039] The bright annealing furnace 9 is a heat treatment device filled with protective gas to prevent oxidation of the steel strip and facilitate subsequent galvanizing. According to one embodiment of the present invention, the bright annealing furnace is a fully enclosed structure filled with protective gas. The steel strip is heated to the required temperature when passing through the furnace cavity and is rapidly cooled to room temperature at the furnace outlet, so that the surface of the steel strip is not oxidized.

[0040] The zinc pot 10 is a device filled with molten zinc liquid. The zinc pot is a heating furnace with refractory materials laid inside, which is used to melt zinc ingots. After the steel strip passes through the zinc pot, the zinc liquid adheres to the surface.

[0041] The wind knife 11 is a device for controlling the thickness of the zinc layer on the galvanized steel strip. For example, the wind knife is a hollow air duct. The special structure of the air outlet can make the air pressure uniform. After compressed air is introduced into the wind knife, the molten zinc liquid on the surface of the steel strip is blown to control the thickness of the zinc layer.

[0042] The multi-stage air-cooling and water-cooling device 12 is a device for reducing the temperature of the steel strip.

[0043] When producing painted steel strips, the cleaning liquid in the two-in-one cleaning device for degreasing and rust removal 7 is emptied, the bright annealing furnace 9 and the air knife 11 are turned off, the zinc pot 10 is lowered to a position away from the steel strip, and the steel strip passes through the above-mentioned device but is not processed. After being processed in the continuous annealing furnace 8, it is cooled in the multi-stage air-cooling and water-cooling device 12.

[0044] When producing galvanized steel strip, the continuous annealing furnace 8 is closed, and the steel strip after deburring enters the two-in-one cleaning device 7 for degreasing and rust removal, and the cleaning liquid removes the oil and rust stains on the surface of the steel strip, and then enters the bright annealing furnace 9 for treatment, annealing in a protective gas atmosphere to eliminate surface stress and oxide layer. Then it enters the zinc pot 10 for galvanizing, and the thickness of the galvanizing is controlled by the air knife 11, and then enters the multi-stage air cooling and water cooling device 12 for cooling.

[0045] According to one embodiment of the present invention, the operation and shutdown of the two-in-one cleaning device 7 for degreasing and rust removal is based on the presence and draining of cleaning liquid or the contact and non-contact of the cleaning liquid with the steel strip. The operation and shutdown of the air knife 11, the continuous annealing furnace 8 and the bright annealing furnace 9 are based on the power on and off. The operation and shutdown of the zinc pot 10 are based on its lifting position, and the zinc liquid is closed when it is separated from the steel strip. In this process, the steel strip runs on the bearing roller and does not contact the various devices. It only moves through the bearing roller and passes through the disposal chambers of the various devices.

[0046] Figure 3 A schematic diagram of a portion of a production line including a closing device is shown.

[0047] Figure 3 The passivation device 13 is connected to Figure 2 The multi-stage air-cooling and water-cooling device 12 is used.

[0048] Figure 3 The invention comprises: a passivation device 13, a first drying device 15, an integrated water washing device 14, a sealing device 16, a second drying device 17, a wax coating device 18, a third drying device 19, a coding device 20, a rear traction tension roller group 21, a rear storage looper 22, and a winding device 23.

[0049] The passivation device 13 is a device for forming a passivation film on the galvanized surface. The passivation device 13 is a common trough structure with a built-in passivation liquid, and the steel strip is dipped in the passivation liquid when passing through.

[0050] The integrated water washing device 14 is a device for removing residual passivation liquid, and the first drying device 15 is a device for drying the steel strip. The integrated water washing device 14 is composed of multiple rinsing tanks. When the water level of the rear rinsing tank is full, it can overflow into the previous rinsing tank to achieve countercurrent rinsing and clean the residual passivation agent on the surface of the steel strip.

[0051] The closing device 16 is a device for painting or coating the steel strip. The closing device 16 is a common trough structure with a built-in sealant. The steel strip is dipped in the sealant when passing through.

[0052] The second drying device 17 is a device for curing the covered film layer. For example, the second drying device 17 is a semi-enclosed heating furnace for drying the sealant.

[0053] The wax coating device 18 is a device for increasing the lubricity of the steel strip surface. The wax coating device 18 is a trough structure, and the steel strip is dipped in wax liquid when passing through. The third drying device 19 is a device for solidifying the wax film, such as a semi-enclosed heating furnace, for drying wax.

[0054] The coding device 20 is a device for printing a logo on the surface of the steel strip. The coding device 20 is composed of a nozzle, an ink cartridge and an electronic control system, and can print graphics and text on the surface of the steel strip when the steel strip passes through.

[0055] The rear traction tension roller group 21 is a device that provides traction for the steel belt, and cooperates with the front traction tension roller group 4 to maintain the tension of the steel belt between the two. For example, the structure of the rear traction tension roller group 21 is a roller system composed of three rubber-coated rollers, which is driven by a torque motor. The steel belt runs in an S shape in the roller system, and the friction between the steel belt and the rollers is used to pull the steel belt, and the tension is established with the front traction tension roller group 4. The tension is controlled by the torque motor and the PLC system.

[0056] The rear storage looper 22 is a device that provides time for unloading finished products without stopping, and a spiral storage looper can be used. The rear storage looper 22 is a looper roller arranged at the upper and lower ends, the upper looper roller is fixed, and the lower looper roller can slide in the inclined track. The steel strip is reciprocatedly wound on the upper and lower looper rollers, and the amount of stored steel strip is increased or decreased by the distance between the upper and lower looper rollers.

[0057] The winding device 23 is a device for winding finished steel strips. The winding device 23 is composed of a winding head, a torque motor and a swing arm. The steel strip is wound on the winding head. The winding speed is controlled by the torque motor. The rewound steel strip or single-disc steel strip is collected by the lateral reciprocating movement or non-movement of the swing arm.

[0058] When producing painted steel strips, the passivation liquid in the passivation device 13 is drained, the washing water in the integrated water washing device 14 is drained, and the first drying device 15 is closed. The steel strip enters the closing device 16, which contains the paint liquid, and the second drying device 17 is operated to solidify the coating of the paint liquid on the surface of the steel strip. The subsequent wax coating device 18 is operated to apply wax on the surface of the steel strip, and the third drying device 19 solidifies the wax film. The coding device 20, the rear traction tension roller group 21, the spiral storage looper, and the winding device 23 are all in operation.

[0059] When producing galvanized steel strip, the passivation device 13 is operated to form a passivation film on the galvanized surface, and then the integrated water washing device 14 is operated to wash the excess passivation liquid, and the first drying device 15 dries the steel strip. The closing device 16 is operated. At this time, the paint liquid is no longer loaded in the closing device 16, but replaced by a sealant. The second drying device 17 is operated to solidify the film formed by the sealant. The subsequent wax coating device 18 is operated to apply wax on the surface of the steel strip, and the third drying device 19 solidifies the wax film. The coding device 20, the rear traction tension roller group 21, the spiral storage looper, and the winding device 23 are all in operation.

[0060] In the present invention, the reuse of the closing device 16 enables the two production processes to be more closely integrated.

[0061] according to Figure 1-3The zinc pot 10 can be set to a raised state and a lowered state to control whether the steel strip is galvanized or not; the degreasing and rust removal two-in-one cleaning device 7, the continuous annealing furnace 8, the bright annealing furnace 9, the passivation device 13, the closing device 16, the first drying device 15, and the second drying device 17 have two states of operation or shutdown, so that they can be flexibly switched to painting or galvanizing processes.

[0062] like Figure 1-3 As shown, a plurality of supporting rollers are arranged between the front traction tension roller group 4 and the rear traction tension roller group 21 , and the plurality of supporting rollers carry the steel belt, and are arranged to enable the steel belt to pass through the device between the front traction tension roller group 4 and the rear traction tension roller group 21 .

[0063] Passing means that when the steel belt runs between the front traction tension roller group 4 and the rear traction tension roller group 21, it only contacts the support rollers, and the running direction is restricted by the support rollers so that it can be processed by each device, but there is no physical contact between the devices.

[0064] Figure 4 A schematic diagram of a zinc pot is shown.

[0065] like Figure 4 As shown, a hydraulic cylinder 24 and a slide bar 25 are provided at the bottom of the zinc pot 10, and the hydraulic cylinder 24 is connected to the slide bar 25 to support the zinc pot 10 so that the zinc pot 10 can be raised or lowered.

[0066] When the zinc pot 10 is in a raised state, the molten zinc liquid contained therein submerges a support roller, and the steel strip on the support roller is galvanized. When the zinc pot 10 is in a lowered state, the zinc liquid is separated from the support roller and the steel strip is no longer galvanized.

[0067] like Figure 4 As shown, the hydraulic cylinder 24 and the slide bar 25 are provided in plurality and evenly distributed at the bottom of the zinc pot 10. Preferably, there are three of them.

[0068] According to one embodiment of the present invention, the two-in-one cleaning device 7 for degreasing and rust removal is provided with a cleaning liquid injection and discharge valve for controlling the liquid level of the cleaning liquid in the two-in-one cleaning device 7 for degreasing and rust removal. When the two-in-one cleaning device 7 for degreasing and rust removal is required for cleaning, the liquid level of the cleaning liquid is increased so that the corresponding steel strip part is immersed below the liquid level. When it is required to be closed, the liquid level of the cleaning liquid is lowered so that the steel strip is separated from the cleaning liquid.

[0069] According to one embodiment of the present invention, the continuous annealing furnace 8, the bright annealing furnace 9, the first drying device 15, and the second drying device 17 are operated or closed by turning the power on and off.

[0070] According to one embodiment of the present invention, the bright annealing furnace 9, the zinc pot 10, the air knife 11, the integrated water washing device 14, and the first drying device 15 are controlled in an interlocking manner.

[0071] The interlocking control means that the state switching between the devices is related to each other, which can be achieved by, for example, PLC control.

[0072] According to one embodiment of the present invention, the closing device 16 has two states: containing paint liquid and containing sealing agent, and can be switched between the two states. The reuse of the closing device 16 reduces the redundancy of equipment in the production line required for the two processes.

[0073] According to one embodiment of the present invention, the passivation device 13 has two states: containing the passivation liquid and discharging the passivation liquid, and can be switched between the two states.

[0074] When producing painted (blued) steel strips for packaging, the uncoiler, shearing and welding machine, vertical storage looper, front traction tension roller group, longitudinal shearing and slitting machine, deburring machine, continuous annealing furnace, zinc pot descending in a non-galvanizing state, multi-stage air cooling and water cooling device, closing device, second drying device, wax coating device, third drying device, inkjet device, rear traction tension roller group, spiral storage looper, and winding device are all in operation.

[0075] The cold rolled coil passes through the above equipment in sequence, and finally obtains the finished painted steel strip for packaging.

[0076] Cold rolled coils include ordinary carbon structural steel, low alloy high strength steel, and alloy structural steel;

[0077] The tensile strength of cold rolled coil is 850MPa-1200MPa;

[0078] The cold rolled coil runs at a uniform speed of 3m / min-30m / min;

[0079] The cold rolled coil is heated to 450℃-650℃ in a continuous annealing furnace;

[0080] The enclosed device is provided with paint liquid;

[0081] The single-side paint film thickness of the painted packaging steel strip is 2um-10um;

[0082] When producing hot-dip galvanized steel strip for packaging, the uncoiler, shearing and welding machine, vertical storage looper, front traction tension roller group, longitudinal shearing and slitting machine, deburring machine, bright annealing furnace, zinc pot turning roller group in galvanizing state, air knife, multi-stage air cooling and water cooling device, passivation device, integrated water washing device, first drying device, sealing device, second drying device, wax coating device, third drying device, coding device, rear traction tension roller group, spiral storage looper, and winding device are all in operation. The cold-rolled coil passes through the above equipment in sequence to finally obtain the finished hot-dip galvanized steel strip for packaging.

[0083] Cold rolled coils include ordinary carbon structural steel, low alloy high strength steel, and alloy structural steel;

[0084] The tensile strength of cold rolled coil is 950MPa-1250MPa;

[0085] The cold rolled coil runs at a uniform speed of 5m / min-100m / min;

[0086] The cold rolled coil is heated to 400℃-600℃ in a continuous annealing furnace;

[0087] A sealing agent is provided in the sealing device;

[0088] The thickness of the zinc layer on one side of the hot-dip galvanized steel strip for packaging is 3um-10um.

[0089] Although multiple embodiments of the present invention have been shown and described herein, it will be apparent to those skilled in the art that such embodiments are provided by way of example only. Those skilled in the art may conceive of many changes, modifications, and alternatives without departing from the thought and spirit of the present invention. It should be understood that in the process of practicing the present invention, various alternatives to the embodiments of the present invention described herein may be adopted. The appended claims are intended to define the scope of protection of the present invention, and therefore cover equivalents or alternatives within the scope of these claims.

Claims

1. Two-in-one painting and galvanizing steel strip production system for packaging, characterized by: include: The unwinding machine (1), the shearing and welding machine (2), the front material storage looper (3), the front traction tension roller group (4), the longitudinal shearing and slitting machine (5), the deburring machine (6), the degreasing and rust removal two-in-one cleaning device (7), the continuous annealing furnace (8), the bright annealing furnace (9), the zinc pot (10), the air knife (11), the multi-stage air-cooling and water-cooling device (12), the passivation device (13), the integrated water washing device (14), the first drying device (15), the sealing device (16), the second drying device (17), the wax coating device (18), the third drying device (19), the coding device (20), the rear traction tension roller group (21), the rear material storage looper (22), and the winding device (23) are arranged in sequence. Wherein, the zinc pot (10) can be set to a raised state and a lowered state to control whether the steel strip is zinc-impregnated or not; The two-in-one cleaning device (7) for degreasing and derusting, the continuous annealing furnace (8), the bright annealing furnace (9), the passivation device (13), the sealing device (16), the first drying device (15), and the second drying device (17) have two states: operating and closed.

2. The two-in-one painted and galvanized steel strip production system for packaging according to claim 1 is characterized in that: The front material storage looper (3) is a vertical material storage looper; The rear material storage looper (22) is a spiral material storage looper.

3. The two-in-one painting and galvanizing packaging steel strip production system according to claim 1 is characterized in that: A plurality of supporting rollers are arranged between the front traction tension roller group (4) and the rear traction tension roller group (21), and the plurality of supporting rollers carry the steel belt and are arranged to enable the steel belt to pass through the device between the front traction tension roller group (4) and the rear traction tension roller group (21).

4. The two-in-one painting and galvanizing packaging steel strip production system according to claim 1 is characterized in that: A hydraulic cylinder (24) and a sliding rod (25) are arranged at the bottom of the zinc pot (10); the hydraulic cylinder (24) is connected to the sliding rod (25) to support the zinc pot (10), so that the zinc pot (10) can be raised or lowered.

5. The two-in-one painted and galvanized packaging steel strip production system according to claim 4 is characterized in that: The hydraulic cylinder (24) and the sliding rod (25) are provided in plurality and are evenly distributed at the bottom of the zinc pot (10).

6. The two-in-one painting and galvanizing packaging steel strip production system according to claim 1 is characterized in that: The two-in-one cleaning device for degreasing and rust removal (7) is provided with a cleaning liquid injection and discharge valve for controlling the liquid level of the cleaning liquid in the two-in-one cleaning device for degreasing and rust removal (7).

7. The two-in-one painting and galvanizing packaging steel strip production system according to claim 1 is characterized in that: The continuous annealing furnace (8), the bright annealing furnace (9) and the first drying device (15) are operated or closed by turning the power on and off.

8. The two-in-one painted and galvanized packaging steel strip production system according to claim 7 is characterized in that: The bright annealing furnace (9), zinc pot (10), air knife (11), integrated water washing device (14), and first drying device (15) are controlled in a chain manner.

9. The two-in-one painted and galvanized packaging steel strip production system according to claim 7 is characterized in that: The sealing device (16) has two states: containing paint liquid and containing sealing agent, and can be switched between the two states.

10. The two-in-one painting and galvanizing packaging steel strip production system according to claim 1 is characterized in that: The passivation device (13) has two states: containing the passivation liquid and discharging the passivation liquid, and can be switched between the two states.

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