Galvanizing device and process for zinc-aluminum-magnesium coated packaging steel strip

Abstract

The present application belongs to the technical field of steel strip hot-dip plating, in particular to a zinc-aluminum-magnesium coating packaging steel strip hot-dip plating device and process, which comprises a fast cooling box, a water storage tank is arranged in the fast cooling box, four groups of material guide rollers are rotatably installed in the water storage tank, a butt joint is formed at the upper end of the fast cooling box, a gas collecting hood is fixedly connected to the butt joint, a heat energy recovery mechanism is connected to the upper end of the gas collecting hood, the heat energy recovery mechanism comprises a support frame, which is fixedly installed on the fast cooling box, a cold heat exchanger, which is fixedly installed on the support frame, a bend pipe, which is connected to the gas inlet of the cold heat exchanger, one end of the bend pipe is connected to the gas collecting hood, and an exhaust fan, which is fixedly installed at the gas outlet of the cold heat exchanger; the device can realize the collection of hot steam, heat energy recovery and drying under the condition of realizing the rapid cooling of the steel strip, avoid the waste of heat energy resources, and discharge the dried gas to the surrounding environment to avoid the rusting of related equipment.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of steel strip hot-dip plating, in particular to a zinc-aluminum-magnesium coating packaging steel strip hot-dip plating device and process. BACKGROUND

[0002] The hot-dip galvanizing zinc-aluminum-magnesium alloy coating process is to immerse the pretreated steel strip into a molten zinc alloy liquid with added aluminum and magnesium to obtain a coating, the magnesium content in the entire coating is usually 1% to 4%, the aluminum content is 5% to 12%, the rest is zinc and unavoidable impurities, the total content of impurity elements does not exceed 1%, and the entire process is mainly divided into annealing, cooling, hot-dip plating and rapid cooling.

[0003] The patent with publication number CN110273121B discloses a zinc-aluminum-magnesium coating steel strip and a preparation method thereof, which adds elements such as Si, Cu, Sn and Re in the plating solution composition, the intermetallic compounds formed can improve the compactness, wear resistance and high-temperature resistance of the coating, and the processing performance of the coating is good at a high temperature of 390℃; in addition, the zinc-rich cell crystal structure generated in the coating does not appear on the surface of the coating, which can significantly improve the surface quality of the steel strip under the premise of ensuring corrosion resistance, and avoids the generation of the most common defects such as black spots, white spots, zinc ash and zinc slag on the surface of the zinc-aluminum-magnesium steel strip.

[0004] In the above scheme, the steel strip is rapidly cooled after hot-dip plating, and the existing rapid cooling is mostly water cooling for rapid cooling. However, the temperature of the steel strip itself is very high after hot-dip plating, and a large amount of water vapor will be generated due to the high temperature of the steel strip itself when the steel strip contacts the cooling water. The water vapor itself has a high temperature, and the water vapor generated in the existing rapid cooling mode will volatilize into the surrounding space naturally. First, the heat carried by the water vapor itself cannot be recovered, causing resource waste. Second, the volatilization of a large amount of water vapor in the surrounding space will increase the humidity of the surrounding space, making the surrounding equipment prone to rust. Therefore, the present application provides a zinc-aluminum-magnesium coating packaging steel strip hot-dip plating device and process. SUMMARY

[0005] In order to make up for the deficiencies of the prior art and solve at least one technical problem raised in the background art.

[0006] The technical scheme adopted by the application to solve its technical problems is that the zinc-aluminum-magnesium coating packaging steel strip hot-dip plating device comprises a rapid cooling box, a water storage tank is arranged in the rapid cooling box, four groups of material guide rollers are rotatably installed in the water storage tank, a butt joint is formed at the upper end of the rapid cooling box, a gas collecting cover is fixedly connected to the butt joint, a heat energy recovery mechanism is connected to the upper end of the gas collecting cover, the heat energy recovery mechanism comprises a support frame fixedly installed on the rapid cooling box, a cold heat exchanger fixedly installed on the support frame, a bend pipe connected to the gas inlet of the cold heat exchanger, one end of the bend pipe connected to the gas collecting cover, and an exhaust fan fixedly installed at the gas outlet of the cold heat exchanger.

[0007] The device realizes the collection of hot steam, heat recovery and drying by setting the gas collecting cover and the heat exchanger, avoids the waste of heat energy resources, and discharges the dried gas to the surrounding environment to avoid rusting of related equipment.

[0008] Preferably, the gas collecting cover is internally provided with a condensate cleaning mechanism, which comprises a fixed pipe fixedly installed at the upper port of the water storage tank, a rotating rod rotatably installed in the fixed pipe, a brush handle fixedly connected to one end of the rotating rod, a sponge block installed on the brush handle, and the sponge block abutting against the inner wall of the gas collecting cover.

[0009] The sponge block wipes off the condensate generated on the inner wall of the gas collecting cover, thereby avoiding the condensate from dropping and ensuring the cleanliness of the surface of the steel belt and the inside of the rapid cooling box.

[0010] Preferably, the brush handle comprises a main frame body, two groups of guide columns fixedly installed in the main frame body, two groups of clamping plates symmetrically arranged in the main frame body and slidably connected to the guide columns, a sponge block clamped between the two groups of clamping plates, a movable plate fixedly connected to one end of the clamping plate, a movable block movably installed above the movable plate, a pressure bearing rod fixedly welded to one end of the movable block, a first spring arranged at the other end of the movable block, two groups of shafts symmetrically welded to the lower end surface of the movable block, an inclined slot formed in the movable plate and slidably connected to the shafts, a water collecting tank arranged at one side of the gas collecting cover and used for collecting the condensate squeezed out of the sponge block, and a pushing block arranged at the upper end of the fixed pipe and used for pushing the pressure bearing rod.

[0011] The two groups of movable plates will move towards each other, and at the same time, the two groups of movable plates drive the two groups of clamping plates to hold the sponge block towards each other, so that the condensate in the sponge block is squeezed out, and the squeezed-out condensate will flow down along the main frame body to the water collecting tank until the end portion of the pressure bearing rod is disengaged from the pushing block. Under the rebounding force of the first spring, the two groups of clamping plates release the squeezing of the sponge block. Therefore, as the brush handle continuously rotates, the sponge block will be continuously squeezed by the two groups of clamping plates, so that the condensate on the sponge block is continuously squeezed off, ensuring the water absorption of the sponge block and the removal effect of the condensate on the inner wall of the gas collecting cover.

[0012] Preferably, the condensed water cleaning mechanism further comprises a switching mechanism, the switching mechanism comprising: a fixed sleeve fixedly installed in the fixed pipe, a rotating sleeve rotatably installed in the fixed pipe, a rotating pipe rotatably installed in the rotating sleeve, a movable rod movably inserted into the rotating pipe, a second spring sleeved on the movable rod, a pressure block fixedly connected to the lower end of the movable rod, the pressure block being slidably connected to a guide groove formed on the fixed pipe, a pin shaft fixedly installed on the fixed sleeve, a swing rod sleeved on the rotating rod, the swing rod having a rectangular slot formed thereon, the pin shaft being slidably connected to the rectangular slot, a ratchet wheel fixedly sleeved on the rotating pipe, three clamping plates clamped on the ratchet wheel, a hinge shaft II hingedly connected to the end of the clamping plate, the hinge shaft II being inserted into the rotating sleeve, two spiral sliding grooves formed on the inner ring of the rotating pipe, two protruding shafts fixedly welded on the upper end of the movable rod, the protruding shafts being driven along the spiral sliding grooves to rotate the rotating pipe, and a pressure roller arranged on the rotating rod for pressing the pressure block;

[0013] The rotating sleeve cannot rotate, and the position of the pressure block after adjustment will not change, When the end of the pressure rod is again extruded by the push block, the position of the pressure block changes, and the position of the condensed water remaining on the inner wall of the gas collecting cover changes, and the original condensed water remaining on the inner wall of the gas collecting cover will be extruded and cleaned by the sponge block. After the sponge block is extruded once, the pressure roller will press the pressure block once, so that the position of the push block changes. Since the position of the push block cannot be fixed, the sponge block can clean the condensed water remaining on the inner wall of the gas collecting cover in the previous time.

[0014] Preferably, the zinc-aluminum-magnesium coated steel strip hot-dip plating process adopts the zinc-aluminum-magnesium coated steel strip hot-dip plating device, and comprises the following steps:

[0015] Step one: the steel strip enters an annealing furnace for annealing, the annealing temperature in the furnace is 650-950 DEG C, and nitrogen and hydrogen mixed gas is introduced into the furnace;

[0016] Step two: after the annealing, the steel strip is air-cooled, the cooling speed is 10-20 DEG C / S, and the cooling temperature is 400-550 DEG C;

[0017] Step three: after the air-cooling, the steel strip enters a hot-dip plating furnace for hot-dip plating, the plating thickness is 40-400 g / m2 during the hot-dip plating process, and the hot-dip plating time is 2-8 s;

[0018] Step four: after the hot-dip plating, the steel strip enters a fast cooling device for water cooling, the cooling speed is 6-25 DEG C / S, and the cold heat exchanger on the fast cooling device exchanges heat with the hot steam generated by the water cooling, so that the heat energy resources are recycled.

[0019] The cold-heat exchanger is internally provided with cooling pipes, the cooling pipes are in the cooling water, the cooling pipes are the medium for the cold-heat exchange of the hot steam, and the cooling pipes absorb the heat of the hot steam and transfer the heat to the cooling water in the cold-heat exchanger, so that the cooling water is heated, thereby realizing the recovery of the heat energy.

[0020] The beneficial effects of the present application are as follows:

[0021] 1. The heat of the hot steam is absorbed by the radiating pipes in the cold-heat exchanger, the radiating pipes transfer the absorbed heat to the cooling water in the cold-heat exchanger, the cold-heat exchange is realized, and a large amount of condensed water is generated after the temperature of the hot steam is lowered, compared with the prior art, the device realizes the rapid cooling of the steel strip, the collection of the hot steam, the recovery of the heat energy and the drying through the setting of the gas collecting cover and the cold-heat exchanger, the waste of the heat energy resources is avoided, the dried gas is discharged to the surrounding environment, and the rusting of the related equipment is avoided.

[0022] 2. The rotating rod is driven to rotate by a group of motors, the rotating rod drives the brush handle to rotate together with the sponge block, the sponge block slides against the inner wall of the gas collecting cover, the condensed water on the inner wall of the gas collecting cover is wiped off by the sponge block, so that the condensed water is prevented from dropping, and the cleanliness of the surface of the steel strip and the inside of the rapid cooling box is ensured.

[0023] 3. In the process that the rotating rod drives the brush handle to rotate together with the sponge block, the end of the pressure bearing rod on the brush handle rotates around the upper end of the fixed pipe, with the rotation of the pressure bearing rod, the end of the pressure bearing rod is extruded by the pushing block, the pushing block pushes the pressure bearing rod, the pressure bearing rod moves together with the movable block and the two groups of shafts I, the movable block compresses the first spring, and the two groups of shafts I slide along the corresponding inclined grooves, since the shafts I extrude the groove walls of the inclined grooves, the two groups of movable plates move towards each other, and the two groups of movable plates drive the two groups of clamping plates to clamp the sponge block towards each other, so that the condensed water in the sponge block is extruded out, the extruded condensed water flows down along the main frame body into the water collecting tank until the end of the pressure bearing rod is disengaged from the pushing block, under the rebounding force of the first spring, the two groups of clamping plates stop extruding the sponge block, therefore, with the continuous rotation of the brush handle, the sponge block is continuously extruded by the two groups of clamping plates, so that the condensed water on the sponge block is continuously extruded off, the water absorption of the sponge block is ensured, and the removal effect of the condensed water on the inner wall of the gas collecting cover by the sponge block is ensured. BRIEF DESCRIPTION OF DRAWINGS

[0024] The present application will be further described below with reference to the drawings.

[0025] Figure 1 It is a structural schematic view of the present application.

[0026] Figure 2 It is a structural sectional view of the present application.

[0027] Figure 3The combination schematic view of the sectional polygas cover and the condensate water cleaning mechanism of the present application.

[0028] Figure 4 The partial sectional view schematic view of the condensate water cleaning mechanism of the present application.

[0029] Figure 5 The Figure 4 The enlarged view at A.

[0030] Figure 6 The combination schematic view of the movable plate and the movable block of the present application.

[0031] Figure 7 The combination schematic view of the sectional fixed tube, rotating rod and transposition mechanism of the present application.

[0032] Figure 8 The partial sectional view schematic view of the transposition mechanism of the present application.

[0033] Figure 9 The combination schematic view of the sectional rotating tube and movable rod of the present application.

[0034] Figure 10 The combination schematic view of the fixed tube and pressure bearing block of the present application.

[0035] In the figure: 1, fast cooling box; 2, water storage tank; 3, material guiding roller; 4, butt joint; 5, polygas cover; 501, water collecting tank; 6, heat energy recovery mechanism; 7, condensate water cleaning mechanism; 601, support frame; 602, heat exchanger; 603, elbow; 604, exhaust fan; 701, fixed tube; 7011, pushing block; 7012, guide groove; 702, rotating rod; 7021, pressure roller; 703, brush handle; 704, sponge block; 705, transposition mechanism; 7031, main frame body; 7032, guide column; 7033, clamping plate; 7034, movable plate; 341, inclined groove; 7035, movable block; 351, shaft one; 7036, pressure bearing rod; 7037, first spring; 7051, fixed sleeve; 7052, rotating sleeve; 7053, rotating tube; 531, ratchet wheel; 532, clamping plate; 533, shaft two; 534, helical sliding groove; 7054, movable rod; 541, convex shaft; 7055, second spring; 7056, pressure bearing block; 7057, pin shaft; 7058, swing rod; 581, rectangular groove. DETAILED DESCRIPTION

[0036] In order to make the technical means, creative features, purposes and effects of the present application easy to understand, the present application is further described below in combination with specific embodiments.

[0037] Embodiment one

[0038] As Figure 1 And Figure 2As shown, the zinc-aluminum-magnesium plated packaging steel strip hot-dip plating device of the embodiment of the present application comprises a fast cooling box 1, a water storage tank 2 is arranged in the fast cooling box 1, four groups of material guide rollers 3 are rotatably installed in the water storage tank 2, a butt joint 4 is formed at the upper end of the fast cooling box 1, the butt joint 4 is fixedly connected with a gas collecting cover 5, the upper end of the gas collecting cover 5 is connected with a heat energy recovery mechanism 6, the heat energy recovery mechanism 6 comprises: a support frame 601 fixedly installed on the fast cooling box 1, a cold-heat exchanger 602 fixedly installed on the support frame 601, an elbow pipe 603 connected with the gas inlet of the cold-heat exchanger 602, one end of the elbow pipe 603 being connected with the gas collecting cover 5, and an exhaust fan 604 fixedly installed at the gas outlet of the cold-heat exchanger 602.

[0039] Specifically, the water storage tank 2 contains cooling water, and the water storage tank 2 is connected with a cooling water circulating device, so that the cooling water in the water storage tank 2 is in a circulating flow state. When the steel strip is fast cooled, the steel strip enters the fast cooling box 1 and is wound around the four groups of material guide rollers 3 in sequence, so that the steel strip can pass through the water storage tank 2 during conveying, the steel strip is cooled by the cooling water in the water storage tank 2, at the same time, the hot steam generated by water cooling drifts upward, at the same time, the exhaust fan 604 is started, the hot steam is gathered by the gas collecting cover 5 and is sucked into the cold-heat exchanger 602 through the elbow pipe 603, the heat of the hot steam is absorbed by the heat dissipation pipes in the cold-heat exchanger 602, the heat absorbed by the heat dissipation pipes is transferred to the cooling water in the cold-heat exchanger 602, cold-heat exchange is realized, and a large amount of condensed water is generated after the hot steam is cooled. Compared with the prior art, the device realizes the collection, heat energy recovery and drying of the hot steam by setting the gas collecting cover 5 and the cold-heat exchanger 602, avoids the waste of heat energy resources, and avoids the rusting of related equipment by discharging the dried gas to the surrounding environment.

[0040] Embodiment two

[0041] As Figure 2 With Figure 3 As shown, the comparative embodiment one, wherein another embodiment of the present application is that: the gas collecting cover 5 is internally provided with a condensed water cleaning mechanism 7, the condensed water cleaning mechanism 7 comprises: a fixed pipe 701 fixedly installed at the upper port of the water storage tank 2, a rotating rod 702 rotatably installed in the fixed pipe 701, a brush handle 703 fixedly connected with one end of the rotating rod 702, a sponge block 704 installed on the brush handle 703, and the sponge block 704 abuts against the inner wall of the gas collecting cover 5.

[0042] Specifically, in the process of the hot steam floating upward, part of the hot steam will contact the gas cover 5 and the inner wall of the elbow pipe 603. Since the temperature of the gas cover 5 and the inner wall of the elbow pipe 603 is much lower than the temperature of the hot steam, the gas cover 5 and the inner wall of the elbow pipe 603 will produce condensed water. As the condensed water increases, the condensed water will flow downward along the inner wall of the gas cover 5, and finally the condensed water will not only drop onto the cooled steel strip, but also drop into the quick cooling box 1. Since the condensed water contains metal dust, after the condensed water is dried, the metal dust adheres to the surface of the steel strip and the inner wall of the quick cooling box 1, affecting the appearance of the surface of the steel strip and making the inside of the quick cooling box 1 dirty. Therefore, during the cooling process of the steel strip, a group of motors drives the rotating rod 702 to rotate, the rotating rod 702 drives the brush handle 703 to rotate together with the sponge block 704, the sponge block 704 slides against the inner wall of the gas cover 5, and the sponge block 704 wipes off the condensed water generated on the inner wall of the gas cover 5, thereby avoiding the condensed water from dropping and ensuring the cleanliness of the surface of the steel strip and the inside of the quick cooling box 1.

[0043] As shown in Figures 4 to 6 , the brush handle 703 includes: a main frame body 7031, the upper end of the main frame body 7031 is fixedly connected with the rotating rod 702, two groups of guide columns 7032 are fixedly installed in the main frame body 7031, two groups of clamping plates 7033 are symmetrically arranged in the main frame body 7031, the clamping plates 7033 are slidingly connected with the guide columns 7032, the sponge block 704 is clamped between the two groups of clamping plates 7033, a movable plate 7034 is fixedly connected with one end of the clamping plate 7033, a movable block 7035 is movably installed above the movable plate 7034, a pressure bearing rod 7036 is fixedly welded at one end of the movable block 7035, a first spring 7037 is arranged at the other end of the movable block 7035, two groups of shafts 351 are symmetrically welded on the lower end surface of the movable block 7035, an inclined groove 341 is formed in the movable plate 7034, the shafts 351 are slidingly connected with the inclined groove 341, a water collecting groove 501 is arranged on one side of the gas cover 5, the water collecting groove 501 is used for collecting the condensed water squeezed out by the sponge block 704, and a push block 7011 is arranged at the upper end of the fixed pipe 701 and is used for pushing the pressure bearing rod 7036.

[0044] Specifically, as the sponge block 704 continuously wipes off the condensed water on the inner wall of the gas cover 5, the condensed water absorbed by the sponge block 704 will reach saturation, and the sponge block 704 will become less effective in removing the condensed water on the inner wall of the gas cover 5. Therefore, during the rotation of the rotating rod 702, the brush handle 703, and the sponge block 704, the end of the pressure rod 7036 on the brush handle 703 will rotate around the upper end of the fixed tube 701. As the pressure rod 7036 rotates, the end of the pressure rod 7036 will be pressed by the pushing block 7011, which will push the pressure rod 7036. The pressure rod 7036, along with the movable block 7035 and the two sets of shafts 351, will move, and the movable block 7035 will compress the first spring 7037. At the same time, the two sets of shafts 351 will slide along the corresponding inclined grooves 341. Since the shafts 351 will press the groove walls of the inclined grooves 341, the two sets of movable plates 7034 will move towards each other, and the two sets of clamping plates 7033 will clamp the sponge block 704, causing the condensed water inside the sponge block 704 to be squeezed out. The squeezed-out condensed water will flow down the main frame 7031 into the water collecting groove 501 until the end of the pressure rod 7036 is disengaged from the pushing block 7011. Under the rebounding force of the first spring 7037, the two sets of clamping plates 7033 will release the sponge block 704. Therefore, as the brush handle 703 continuously rotates, the sponge block 704 will be continuously squeezed by the two sets of clamping plates 7033, causing the condensed water on the sponge block 704 to be continuously squeezed off, ensuring the water absorption of the sponge block 704 and the removal effect of the condensed water on the inner wall of the gas cover 5.

[0045] As Figures 7 to 10As shown, the condensate cleaning mechanism 7 further comprises a transposition mechanism 705, which comprises a fixed sleeve 7051 fixedly installed in the fixed pipe 701, a rotating sleeve 7052 rotatably installed in the fixed pipe 701, a rotating pipe 7053 rotatably installed in the rotating sleeve 7052, a movable rod 7054 movably inserted into the rotating pipe 7053, a second spring 7055 sleeved on the movable rod 7054, a pressure block 7056 fixedly connected to a lower end of the movable rod 7054, an end of the pressure block 7056 slidably connected to a guide groove 7012 formed in the fixed pipe 701, a pin shaft 7057 fixedly installed on the fixed sleeve 7051, a swing rod 7058 sleeved on the rotating rod 702, one end of the swing rod 7058 fixedly connected to the push block 7011, a rectangular groove 581 formed in the swing rod 7058, the pin shaft 7057 slidably connected to the rectangular groove 581, a ratchet wheel 531 fixedly sleeved on the rotating pipe 7053, three sets of clamping plates 532 clamped on the ratchet wheel 531, a hinge shaft two 533 hingedly connected to an end of the clamping plate 532, the hinge shaft two 533 inserted into the rotating sleeve 7052, two sets of spiral sliding grooves 534 formed in an inner circle of the rotating pipe 7053, two sets of convex shafts 541 fixedly welded on an upper end of the movable rod 7054, the convex shafts 541 driven along the spiral sliding grooves 534 to rotate the rotating pipe 7053, and a pressure roller 7021 arranged on the rotating rod 702 and used to press the pressure block 7056.

[0046] Specific, rotating sleeve 7052 coated with a rubber layer, rubber layer close to the inner ring of the fixed sleeve 7051, increase the rotating sleeve 7052 and fixed sleeve 7051 inner circle friction, so that the rotating sleeve 7052 can not easily rotate, card plate 532 for magnet, card plate 532 on the ratchet 531 has a certain adsorption, end of the pressure bar 7036 is extruded by the push block 7011, two groups of clamping plate 7033 will be clamping sponge block 704, but, sponge block 704 in the extrusion of clamping, sponge block 704 still adhere to the inner wall of the gas cover 5, from the sponge block 704 extruded condensate will be in contact with the inner wall of the gas cover 5, and left on the inner wall of the gas cover 5, if the push block 7011 position remains unchanged, the sponge block 704 will be extruded on the inner wall of the gas cover 5 in the same place, so that the condensate left on the place will be more and more, the condensate will be dropped to the drop to the quick cooling box 1 inside, therefore, in the process of rotating rod 702 driven brush handle 703 together with the sponge block 704 rotation, when the end of the pressure bar 7036 is pushed by the push block 7011, with the rotation of the pressure bar 7036, the pressure bar 7036 will drive the pressure roller 7021 to extrude the pressure block 7056, so that the pressure block 7056 moves upward together with the movable rod 7054, and the pressure block 7056 compresses the second spring 7055, at the same time, the movable rod 7054 drives two groups of convex shaft 541 to slide along the corresponding spiral slide groove 534, under the guidance of the spiral slide groove 534, the rotating tube 7053 rotates together with the ratchet 531, because the card plate 532 is against the teeth of the ratchet 531, the rotating ratchet 531 drives the rotating sleeve 7052 to rotate through the card plate 532 and shaft two 533, the rotating sleeve 7052 drives the pin shaft 7057 to slide along the rectangular slot 581, and makes the swing rod 7058 rotate around the rotating rod 702 as the axis, the rotating rod 702 drives the push block 7011 to slide around the fixed tube 701 outer circle, so that the position of the push block 7011 changes, until the pressure roller 7021 is offset from the pressure block 7056, the rotating sleeve 7052 is rotated by 180 degrees, under the action of the rebound force of the second spring 7055, the pressure block 7056 moves back together with the movable rod 7054, the rotating tube 7053 will also rotate back, because the card plate 532 cannot resist the ratchet 531 at this time, the rotating sleeve 7052 cannot rotate, the adjusted position of the pressure block 7056 will not move, when the end of the pressure bar 7036 is extruded by the push block 7011 again, because the position of the pressure block 7056 changes, the position of the condensate left on the inner wall of the gas cover 5 changes, and the condensate left on the inner wall of the gas cover 5 will be cleaned by the sponge block 704 after being extruded, and the sponge block 704 will be extruded once every time, so that the push block 7011 changes position, because the position of the push block 7011 will not be fixed in one place, so that the sponge block 704 can clean the condensate left on the inner wall of the gas cover 5 last time.

[0047] Example three

[0048] Comparative Example One, wherein another embodiment of the present application is: a zinc-aluminum-magnesium plated packaging steel strip hot-dip plating process, which uses the above-mentioned zinc-aluminum-magnesium plated packaging steel strip hot-dip plating device, and includes the following steps:

[0049] Step one: the steel strip enters the annealing furnace for annealing, the annealing temperature in the furnace is 650-950℃, and a mixed gas of nitrogen and hydrogen is introduced into the furnace;

[0050] Step two: after the steel strip is annealed, the steel strip is air-cooled, the cooling speed is 10-20℃ / S, and the cooling temperature is 400-550℃;

[0051] Step three: after the steel strip is air-cooled, the steel strip enters the hot-dip plating furnace, and the steel strip is hot-dip plated, during the hot-dip plating process, the plating thickness is 40-400g / m2, and the hot-dip plating time is 2-8s;

[0052] Step four: after the steel strip is hot-dip plated, the steel strip enters the quick cooling device for water cooling, the cooling speed is 6-25℃ / S, and the cold heat exchanger 602 on the quick cooling device exchanges heat with the hot steam generated by water cooling, so as to realize the recycling of heat energy.

[0053] Specifically, the cold heat exchanger 602 is internally provided with a cooling pipe, the cooling pipe is placed in cooling water, and the cooling pipe is a medium for cold heat exchange of the hot steam. During the process of absorbing heat of the hot steam by the cooling pipe, the heat is transferred to the cooling water through the cooling pipe, so that the cooling water is heated, thereby realizing the recycling of heat energy.

[0054] Working principle: when the steel strip is quickly cooled, the steel strip enters the quick cooling box 1, and is sequentially coiled through the four groups of material guide rollers 3, so that the steel strip can pass through the water storage tank 2 during conveying, the cooling water in the water storage tank 2 cools the steel strip, at the same time, the hot steam generated by water cooling floats upward, at the same time, the exhaust fan 604 is started, the hot steam is gathered through the gas collecting hood 5, and is sucked into the cold heat exchanger 602 through the elbow pipe 603. The heat exchanger 602 internally provided with a heat dissipation pipe absorbs the heat of the hot steam, the heat dissipation pipe transfers the absorbed heat to the cooling water in the cold heat exchanger 602, realizes cold heat exchange, and a large amount of condensed water is generated after the hot steam is cooled;

[0055] In the process of cooling the steel belt, the rotating rod 702 is driven to rotate by a set of motors, the rotating rod 702 drives the brush handle 703 to rotate together with the sponge block 704, the sponge block 704 slides against the inner wall of the gas cover 5, the sponge block 704 wipes off the condensed water generated on the inner wall of the gas cover 5, the end of the pressure bearing rod 7036 on the brush handle 703 rotates around the upper end of the fixed tube 701, as the pressure bearing rod 7036 rotates, the end of the pressure bearing rod 7036 is extruded by the push block 7011, the push block 7011 pushes the pressure bearing rod 7036, the pressure bearing rod 7036 moves together with the movable block 7035 and the two sets of shafts 351, and the movable block 7035 compresses the first spring 7037, and at the same time, the two sets of shafts 351 slide along the corresponding inclined grooves 341, because the shafts 351 extrude the groove walls of the inclined grooves 341, the two sets of movable plates 7034 move towards each other, and at the same time, the two sets of movable plates 7034 drive the two sets of clamping plates 7033 to clamp the sponge block 704, so that the condensed water in the sponge block 704 is extruded out;

[0056] When the end of the pressure bearing rod 7036 is pushed by the push block 7011, as the pressure bearing rod 7036 rotates, the pressure bearing rod 7036 extrudes the pressure block 7056, the pressure block 7056 moves upwards together with the movable rod 7054, and the pressure block 7056 compresses the second spring 7055, at the same time, the movable rod 7054 drives the two sets of protruding shafts 541 to slide along the corresponding spiral sliding grooves 534, under the guidance of the spiral sliding grooves 534, the rotating tube 7053 rotates together with the ratchet wheel 531, because the clamping plate 532 abuts against the teeth of the ratchet wheel 531, the rotating ratchet wheel 531 drives the rotating sleeve 7052 to rotate through the clamping plate 532 and the shaft 533, the rotating sleeve 7052 drives the pin shaft 7057 to slide along the rectangular groove 581, and the swing rod 7058 rotates around the rotating rod 702, the rotating rod 702 drives the push block 7011 to slide around the outer circle of the fixed tube 701, so that the position of the push block 7011 changes, until the pressure roller 7021 is misaligned with the pressure block 7056, the rotating sleeve 7052 rotates 180 degrees, under the rebounding force of the second spring 7055, the pressure block 7056 moves back together with the movable rod 7054, and the rotating tube 7053 also rotates back, because the clamping plate 532 cannot resist the ratchet wheel 531 at this time, the rotating sleeve 7052 cannot rotate, and the adjusted position of the pressure block 7056 is fixed, when the end of the pressure bearing rod 7036 is extruded by the push block 7011 again, because the position of the pressure block 7056 changes, the position of the condensed water left on the inner wall of the gas cover 5 changes, and the original condensed water left on the inner wall of the gas cover 5 is squeezed out and cleaned by the sponge block 704.

[0057] The above shows and describes the basic principles, main features and advantages of the present application. Those skilled in the art should understand that the present application is not limited to the above-mentioned embodiments, and the above-mentioned embodiments and descriptions in the specification are only to illustrate the principles of the present application. Without departing from the spirit and scope of the present application, various changes and improvements can be made to the present application, and these changes and improvements all fall within the scope of the claimed present application. The scope of protection of the present application is defined by the appended claims and their equivalents.

Claims

1. A galvanizing installation for zinc-aluminum-magnesium coated packaging steel strip, comprising a fast cooling box (1), characterized in that: The quick cooling box (1) is provided with a water storage tank (2), four groups of material guide rollers (3) are rotatably installed in the water storage tank (2), a butt joint (4) is formed in the upper end of the quick cooling box (1), the butt joint (4) is fixedly connected with a gas collecting cover (5), and the upper end of the gas collecting cover (5) is connected with a heat energy recovery mechanism (6); The heat energy recovery mechanism (6) comprises: a support frame (601) fixedly installed on the quick cooling box (1); a cold-heat exchanger (602) fixedly installed on the support frame (601); a bend pipe (603) connected with an air inlet of the cold-heat exchanger (602), one end of the bend pipe (603) being connected with the gas collecting cover (5); an exhaust fan (604) fixedly installed at an air outlet of the cold-heat exchanger (602); the gas collecting cover (5) is internally provided with a condensed water cleaning mechanism (7), and the condensed water cleaning mechanism (7) comprises: a fixed pipe (701) fixedly installed at the upper port of the water storage tank (2); a rotating rod (702) rotatably installed in the fixed pipe (701); a brush handle (703) fixedly connected with one end of the rotating rod (702); a sponge block (704) installed on the brush handle (703) and abutting against the inner wall of the gas collecting cover (5); the brush handle (703) comprises: a main frame body (7031) having the rotating rod (702) fixedly connected with the upper end thereof; two groups of guide columns (7032) fixedly installed in the main frame body (7031); two groups of clamping plates (7033) symmetrically arranged in the main frame body (7031) and slidably connected with the guide columns (7032), the sponge block (704) being clamped between the two groups of clamping plates (7033); an activity plate (7034) fixedly connected with one end of the clamping plate (7033); an activity block (7035) movably installed above the activity plate (7034); a pressure bearing rod (7036) fixedly welded at one end of the activity block (7035); a first spring (7037) arranged at the other end of the activity block (7035); a pushing block (7011) arranged at the upper end of the fixed pipe (701) and used for pushing the pressure bearing rod (7036); two groups of shafts (351) symmetrically welded on the lower end surface of the activity block (7035), and an inclined groove (341) is formed in the activity plate (7034), the shafts (351) being slidably connected with the inclined groove (341); a water collecting tank (501) is arranged at one side in the gas collecting cover (5) and used for collecting condensed water squeezed out by the sponge block (704); the condensed water cleaning mechanism (7) further comprises a transposition mechanism (705), and the transposition mechanism (705) comprises: a fixed sleeve (7051) fixedly installed in the fixed pipe (701); a rotating sleeve (7052) rotatably installed in the fixed pipe (701); A rotating pipe (7053) is rotatably installed in the rotating sleeve (7052); A movable rod (7054) movably plugs the rotating pipe (7053); A second spring (7055) is sleeved on the movable rod (7054); A pressure block (7056) is fixedly connected to the lower end of the movable rod (7054), and the end of the pressure block (7056) is slidably connected to a guide groove (7012) formed on the fixed pipe (701); A pin shaft (7057) is fixedly installed on the fixed sleeve (7051); A swing rod (7058) is sleeved on the rotating rod (702), one end of the swing rod (7058) is fixedly connected to the push block (7011), and a rectangular groove (581) is formed on the swing rod (7058), and the pin shaft (7057) is slidably connected to the rectangular groove (581); A ratchet (531) is fixed on the rotating pipe (7053), three sets of clamping plates (532) are clamped on the ratchet (531), the end of the clamping plate (532) is hingedly connected to a second shaft (533), and the second shaft (533) is plugged into the rotating sleeve (7052); Two sets of spiral sliding grooves (534) are formed on the inner ring of the rotating pipe (7053), two sets of convex shafts (541) are fixedly welded on the upper end of the movable rod (7054), the convex shafts (541) are driven along the spiral sliding grooves (534) to rotate the rotating pipe (7053), and a pressing roller (7021) for pressing the pressure block (7056) is arranged on the rotating rod (702).

2. A hot dip coating process for a zinc-aluminum-magnesium coated packaging steel strip, which process uses a hot dip coating installation for a zinc-aluminum-magnesium coated packaging steel strip as claimed in claim 1, characterized in that, The method comprises the following steps: Step one: the steel strip enters an annealing furnace for annealing, the annealing temperature in the furnace is 650-950℃, and nitrogen and hydrogen mixed gas is introduced into the furnace; Step two: after the steel strip is annealed, the steel strip is air-cooled, the cooling speed is 10-20℃ / S, and the cooling temperature is 400-550℃; Step three: after the steel strip is air-cooled, the steel strip enters a hot-dip plating furnace to perform hot-dip plating on the steel strip, and during the hot-dip plating process, the plating layer thickness is 40-400 g / m 2 , and the hot-dip plating time is 2-8 s; Step four: after the steel strip is hot-dip plated, the steel strip enters a rapid cooling device for water cooling, the cooling speed is 6-25℃ / S, and a cold-heat exchanger (602) on the rapid cooling device exchanges heat with the hot steam generated by water cooling, so that the heat energy resource is recycled.

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