A hot-dip galvanizing process for high-strength alloyed steel plates

Abstract

The invention relates to the technical field of hot-dip galvanizing, in particular to a high-strength alloyed steel plate hot-dip galvanizing process. The pickling device used in the process comprises bases arranged on the left and right sides of a pickling tank, the bases are provided with hydraulic lifting cylinders, the upper ends of the piston rods of the hydraulic lifting cylinders are fixedly connected to the lower ends of cover plates, the cover plates are located directly above the pickling tank and the size thereof matches the size of the pickling tank; four columns distributed in a rectangular shape are arranged at the lower end of the cover plates, and the spacing between the left and right columns is greater than the length of the workpiece; the arrangement of the cover plates and the hydraulic lifting cylinders can prevent a large amount of acid mist generated during pickling from escaping and causing corrosion and damage to factory buildings and equipment, and avoid pollution to the environment, thereby ensuring the health of working people.

Description

Technical Field

[0001] The invention relates to the technical field of hot-dip galvanizing, in particular to a high-strength alloyed steel plate hot-dip galvanizing process. Background Art

[0002] Hot-dip galvanizing, also known as hot-dip galvanizing and hot-dip galvanizing, is an effective way to prevent metal corrosion. It is mainly used in metal structural facilities in various industries. The rust-free steel parts are immersed in molten zinc liquid at about 500°C to make a zinc layer adhere to the surface of the steel components, thereby achieving the purpose of corrosion protection. The hot-dip galvanizing process is degreasing-pickling-water washing-adding auxiliary plating solution-drying-hanging plating-cooling-chemical-cleaning-polishing-hot-dip galvanizing completion. The hot-dip galvanizing layer formation process is the process of forming an iron-zinc alloy between the iron matrix and the outermost pure zinc layer. The iron-zinc alloy layer is formed on the surface of the workpiece during hot-dip plating, which makes the iron and the pure zinc layer well combined.

[0003] The traditional hot-dip galvanizing pickling process: the crane lifts the whole package of metal parts (such as steel plates) and sends them to the pickling tank for soaking for a period of time to remove the surface oxide scale. However, this pickling method has the following problems: (1) a large amount of acid mist is generated during the pickling process, which is difficult to collect and recycle. The acid mist will corrode and damage the factory and equipment, pollute the environment, and endanger human health; (2) the pickling efficiency is low, the pickling quality is poor, and the phenomenon of plating leakage caused by insufficient pickling often occurs; (3) after long-term immersion, the pickling solution is easy to stratify, making the concentration of the lower part of the pickling solution higher, resulting in some steel plates being over-pickled and some under-pickled, affecting the pickling quality.

[0004] To this end, the present invention designs a high-strength alloyed steel plate hot-dip galvanizing process. Through the arrangement of a cover plate and a hydraulic lifting cylinder, it can prevent a large amount of acid mist generated during pickling from escaping and causing corrosion and damage to factory buildings and equipment, avoid pollution to the environment, and thus ensure the health of working people. Summary of the invention

[0005] In order to make up for the deficiencies of the prior art and solve the problem that a large amount of acid mist is easily generated during pickling in the existing hot-dip galvanizing process, which is difficult to collect and recycle, and the acid mist will cause corrosion and damage to factory buildings and equipment, pollute the environment, and endanger human health, the present invention proposes a high-strength alloyed steel plate hot-dip galvanizing process.

[0006] The technical solution adopted by the present invention to solve the technical problem is: a high-strength alloyed steel plate hot-dip galvanizing process, comprising the following steps:

[0007] S1. Pickling: Add pickling liquid into the pickling tank, and add mist suppressant to suppress the escape of acid mist. Put the workpiece into the pickling tank through the pickling device for pickling, so as to achieve the purpose of removing the oxide scale and rust on the surface of the workpiece;

[0008] S2, dipping in a plating agent: dipping the workpiece after pickling in step S1 into a plating agent to make it have a certain activity before dipping to avoid secondary oxidation and improve the bonding strength of subsequent galvanizing;

[0009] S3, drying and preheating: putting the workpiece immersed in the plating agent in step S2 into an oven to prevent the workpiece from being deformed due to the rapid increase in temperature during immersion plating, and to remove residual moisture to prevent zinc explosion;

[0010] S4, hot dip galvanizing: put the workpiece preheated in S3 into the galvanizing pot, control the zinc liquid temperature, immersion time and the speed of the workpiece being drawn out of the zinc liquid, and complete the galvanizing operation of the workpiece;

[0011] Among them, the pickling device includes a base arranged on the left and right sides of the pickling tank, and a hydraulic lifting cylinder is arranged on the base. The upper ends of the piston rods of the hydraulic lifting cylinders are fixedly connected to the lower end of the cover plate, and the cover plate is located directly above the pickling tank and its size matches the size of the pickling tank; four columns distributed in a rectangular shape are arranged at the lower end of the cover plate, and the distance between the left and right columns is greater than the length of the workpiece; a plurality of horizontally arranged support plates are arranged between the columns, and the distance between adjacent support plates is greater than the height of the workpiece; a plurality of pickling holes are arranged on the support plate.

[0012] When in use, the cover plate is moved up by the piston rod of the hydraulic lifting cylinder, and then the support plate is moved out of the pickling tank, so that the steel plate workpiece is conveniently placed on each support plate, and then the piston rod of the hydraulic lifting cylinder is retracted, and the support plate and the workpiece are immersed in the pickling liquid of the pickling tank, and the cover plate covers the pickling tank at the same time, so as to avoid the escape of a large amount of acid mist generated during pickling and corrosion and damage to the factory building and equipment, and avoid pollution to the environment, thereby ensuring the health of the working people; at the same time, the acid mist that does not escape will gather above the pickling tank to form larger droplets, and then re-integrate into the pickling liquid, reducing the loss of the pickling liquid while ensuring the concentration of the pickling liquid, thereby ensuring the quality of pickling and avoiding the situation of insufficient pickling; the bottom surface of the workpiece can be pickled by setting the pickling hole, avoiding the situation of insufficient pickling of the bottom surface of the workpiece, ensuring the quality of pickling, and avoiding the phenomenon of plating leakage caused by insufficient pickling.

[0013] Preferably, the pickling solution is prefabricated by the following method: first, hydrochloric acid with a mass concentration of 30% is mixed with water in a volume ratio of 1:3 to prepare a base liquid, and then 0.5g of zinc sulfate, 9g of citric acid, 2g of sodium silicate and 6g of sodium dodecylbenzene sulfonate are added to each liter of the base liquid, and the mixture is stirred and mixed evenly. By adding citric acid, iron oxide can be dissolved to generate a complex of citric iron. Compared with inorganic acid, the acidity of citric acid is relatively weak, so the corrosiveness to the equipment is also relatively small, the safety and reliability of citric acid cleaning is relatively strong, and the waste liquid is also relatively easy to handle, and will not cause harm to the human body; at the same time, sodium dodecylbenzene sulfonate is added, which has a good degreasing power, so it can be used for one-time degreasing and rust removal, and the surface oil and rust removal effect of the workpiece is very good, reducing the degreasing process, thereby improving production efficiency, and sodium dodecylbenzene sulfonate can produce relatively abundant foam, and can generate a stable and dense foam layer at the liquid surface, reduce the generation of acid mist, and greatly improve the production environment.

[0014] Preferably, the pickling tank is provided with a partition arranged in the front-to-back direction, the partition divides the pickling tank into a pickling chamber on the left and a mixing chamber on the right, and a plurality of overflow troughs connecting the pickling chamber and the mixing chamber are provided at the upper end of the partition; a circulating liquid pump is fixedly provided on the front side of the pickling tank, the liquid inlet of the circulating liquid pump is connected to the lower end of the pickling chamber through a first liquid pipe, and the liquid outlet of the circulating liquid pump is connected to the mixing chamber through a second liquid pipe. The pickling liquid at the bottom of the pickling chamber is extracted by the circulating liquid pump and discharged into the mixing chamber for mixing, and the mixed pickling liquid is returned to the upper end of the pickling chamber by overflow, thereby realizing the flow between the upper and lower layers of the pickling liquid in the pickling tank, avoiding the situation where the upper layer is under-pickled and the next layer is over-pickled due to the stratification of the pickling liquid, and the flowing pickling liquid can also rinse the surface of the workpiece, increasing the pickling efficiency.

[0015] Preferably, the second liquid pipe is connected to a steam pipe near the liquid inlet of the circulating liquid pump, the steam pipe is connected to an external steam supply device, and a one-way valve is correspondingly arranged on the steam pipe. Through the arrangement of the steam pipe, on the one hand, the pickling liquid can be heated by supplementing steam, and the heating speed is fast, ensuring that the acidic liquid can be pickled at a better temperature, thereby improving the pickling efficiency; on the other hand, the steam entering the mixing chamber through the second liquid pipe can also achieve a better bubbling effect, which will not be conducive to the mixing of the acidic liquid in the mixing chamber, and can also generate more foam, reducing the probability of acid mist production.

[0016] Preferably, a mounting frame is fixedly arranged on the cover plate, and a motor is arranged on the mounting frame, and the motor extends to the bottom of the cover plate through a first rotating shaft and is rotatably connected to the rotating extrusion block; a horizontally arranged fixed plate is arranged between the columns, and the fixed plate is arranged higher than the uppermost support plate, and the fixed plate is provided with a plurality of through holes on the rotation path of the rotating extrusion block, and a top column that can move up and down is arranged in the through hole, and the upper end of the top column is connected to the upper end of the fixed plate through a first spring; the rotating extrusion block can squeeze the top column during the rotation process and move it downward to collide with the uppermost support plate through inertia. The first rotating shaft is driven to rotate by the motor, and then the rotating extrusion block is driven to rotate, so that the rotating extrusion block can squeeze the top column downward, and the top column overcomes the elastic force of the first spring under the action of inertia and continues to move downward to collide with the workpiece on the support plate, thereby causing the workpiece to vibrate, and then the gap between the workpiece and the support plate can enter sufficient pickling liquid, further avoiding the plating leakage phenomenon caused by insufficient pickling, and at the same time, the vibration will accelerate the shedding of rust and improve the pickling effect.

[0017] Preferably, a silicone sleeve is provided at the lower end of the top column to prevent deformation or damage to the workpiece when the top column collides with the workpiece. By providing the silicone sleeve, the top column can collide with the workpiece to cause deformation or damage to the workpiece. At the same time, when the height of the workpiece is high, the silicone sleeve can be deformed to allow the top column to continue to move downward, thereby avoiding the rotating extrusion block and avoiding jamming.

[0018] Preferably, a vertically arranged baffle is provided on the left side of the support plate, and a push plate is provided on the left side of the upper end of the support plate, and the push plate and the baffle are connected by a plurality of second springs; a vertically arranged second rotating shaft is provided on the right side of the support plate, and a cam corresponding to each push plate is provided on the second rotating shaft; the second rotating shaft passes through the cover plate and extends to the upper end of the cover plate and is connected to the second gear, and the first rotating shaft is provided with a first gear meshing with the second gear. Through the arrangement of the baffle, the second spring, the push plate and the cam, when the first rotating shaft rotates, the cooperation of the first gear and the second gear can drive the second rotating shaft to rotate, thereby causing the cam to rotate, and the cooperation of the cam and the second spring can realize the periodic left and right movement of the workpiece on the support plate, thereby enabling the lower surface of the workpiece to achieve a more sufficient pickling, avoiding the plating leakage caused by insufficient pickling, and at the same time, the movement of the workpiece itself also accelerates the disturbance of the pickling liquid, thereby improving the pickling quality, and in addition, the left and right movement of the workpiece enables its upper and lower surfaces to be better washed, thereby facilitating the detachment of rust and improving the efficiency of subsequent pickling.

[0019] Preferably, a first annular suction box matching the upper opening of the pickling chamber is provided on the left side of the lower end of the cover plate, and the side wall of the first annular suction box fits the inner wall of the pickling chamber; a second annular suction box matching the upper opening of the mixing chamber is provided on the right side of the lower end of the cover plate, and the side wall of the second annular suction box fits the inner wall of the mixing chamber. By providing the first annular suction box and the second annular suction box, surface sealing can be achieved by fitting their side walls with the inner wall of the pickling chamber or the mixing chamber, further reducing the probability of acid mist escaping.

[0020] Preferably, the first annular suction box and the second annular suction box are both provided with an annular sealing groove on their outer peripheries, and a sealing ring is provided in the sealing groove. The provision of the sealing groove and the sealing ring can further reduce the probability of acid mist escaping, thereby preventing a large amount of acid mist generated during pickling from escaping and causing corrosion and damage to the factory building and equipment, avoiding pollution to the environment, and ensuring the health of the working people.

[0021] Preferably, the inner walls of the first annular suction box and the second annular suction box are both provided with a plurality of suction holes, and a circulating air pump is fixedly provided on the right side of the upper end of the cover plate, and the air inlet of the circulating air pump is connected with the second annular suction box and the first annular suction box in sequence through a first air pipe; the air outlet of the circulating air pump is connected with a plurality of air outlet boxes fixed under the cover plate through a second air pipe, and the air outlet box is located between the first annular suction box and the second annular suction box and arranged opposite to the overflow groove, and the lower end of the air outlet box is arranged with the left side higher and the right side lower and is provided with a plurality of air outlet holes, and the air outlet holes are located below the liquid level. By setting up the circulating air pump, the acid mist floating above the pickling chamber and the mixing chamber can be sucked in through the air suction hole, and then the acid mist enters the air outlet box through the first air pipe, the circulating air pump and the second air pipe and enters the pickling liquid through the air outlet, so as to realize the recovery of the acid mist, reduce the risk of acid mist escape and reduce the loss of pickling liquid, thereby ensuring the pickling quality; at the same time, because the air outlet can spray acid mist at the lower left, it can also accelerate the generation of foam at the liquid surface and reduce the generation of acid mist. In addition, the air flow sprayed from the air outlet also has a leftward thrust, which can push the foam to one side of the pickling chamber, so that there is enough foam on the liquid surface of the pickling chamber, further reducing the generation of acid mist.

[0022] Preferably, an acid mist recovery pipeline with a back pressure valve is also provided on the cover plate above the mixing chamber, and the acid mist recovery pipeline is connected to an external acid mist recovery device. Through the setting of the back pressure valve, it can be opened to release pressure when the pressure in the pickling tank is too high, thereby ensuring that the pickling device can operate normally; the acid mist after pressure relief is recovered through the acid mist recovery pipeline, thereby reducing the use of new acid and reducing costs through the secondary use of acid mist.

[0023] The beneficial effects of the present invention are as follows:

[0024] 1. The hot-dip galvanizing process for high-strength alloyed steel plates described in the present invention can prevent a large amount of acid mist generated during pickling from escaping and causing corrosion and damage to factory buildings and equipment, thereby avoiding pollution to the environment and ensuring the health of workers through the arrangement of a cover plate and a hydraulic lifting cylinder.

[0025] 2. The hot-dip galvanizing process for high-strength alloyed steel plates described in the present invention enables the lower surface of the workpiece to be pickled more fully through the arrangement of a push plate, a second spring and a cam, thereby avoiding the phenomenon of missing plating caused by insufficient pickling. At the same time, the movement of the workpiece itself also accelerates the disturbance of the pickling liquid, thereby improving the pickling quality.

[0026] 3. The hot-dip galvanizing process for high-strength alloyed steel plates described in the present invention realizes the recovery of acid mist through the arrangement of the first annular suction box, the second annular suction box, the circulating air pump and the air outlet box, thereby reducing the risk of acid mist escape and the loss of pickling liquid, thereby ensuring the quality of pickling; at the same time, since the air outlet can spray acid mist at the lower left, it can also accelerate the generation of foam at the liquid surface and reduce the generation of acid mist. In addition, the air flow sprayed from the air outlet also has a leftward thrust, which can push the foam to one side of the pickling chamber, so that there is enough foam on the liquid surface of the pickling chamber, further reducing the generation of acid mist. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] The present invention will be further described below in conjunction with the accompanying drawings.

[0028] Figure 1 It is a process flow chart of the present invention;

[0029] Figure 2 It is a stereogram of a pickling device used in the present invention from one viewing angle;

[0030] Figure 3 It is a stereogram of the pickling device used in the present invention from another perspective;

[0031] Figure 4 yes Figure 3 A partial enlarged view of the middle A;

[0032] Figure 5 yes Figure 3 A partial enlarged view of point B in the middle;

[0033] In the figure:

[0034] 1. Pickling tank; 11. Pickling chamber; 12. Partition; 13. Mixing chamber; 14. Overflow tank; 2. Base; 3. Hydraulic lifting cylinder; 4. Cover plate; 41. Column; 42. Support plate; 43. Pickling hole; 44. Push plate; 45. Fixed plate; 46. Top column; 47. First spring; 48. Baffle; 49. Second spring; 5. Mounting frame; 51. Motor; 52. First gear; 53. Second gear; 54. Second rotating shaft; 55. Cam; 56. First rotating shaft; 57. Rotating extrusion block; 6. Circulating liquid pump; 61. First liquid pipe; 62. Second liquid pipe; 63. Steam pipe; 7. Circulating air pump; 71. First air pipe; 72. Second air pipe; 73. First annular suction box; 74. Second annular suction box; 75. Suction hole; 76. Sealing groove; 77. Air outlet box; 78. Air outlet. DETAILED DESCRIPTION

[0035] In order to make the technical means, creative features, objectives and effects achieved by the present invention easy to understand, the present invention is further explained below in conjunction with specific implementation methods.

[0036] like Figures 1 to 5 As shown, a high-strength alloyed steel plate hot-dip galvanizing process comprises the following steps:

[0037] S1, pickling: add pickling liquid into the pickling tank 1, and add mist suppressant to suppress the escape of acid mist, and put the workpiece plate into the pickling tank 1 through the pickling device for pickling, so as to achieve the purpose of removing the oxide scale and rust on the surface of the workpiece;

[0038] S2, dipping in a plating agent: dipping the workpiece after pickling in step S1 into a plating agent to make it have a certain activity before dipping to avoid secondary oxidation and improve the bonding strength of subsequent galvanizing;

[0039] S3, drying and preheating: putting the workpiece immersed in the plating agent in step S2 into an oven to prevent the workpiece from being deformed due to the rapid increase in temperature during immersion plating, and to remove residual moisture to prevent zinc explosion;

[0040] S4, hot dip galvanizing: put the workpiece preheated in S3 into the galvanizing pot, control the zinc liquid temperature, immersion time and the speed of the workpiece being drawn out of the zinc liquid, and complete the galvanizing operation of the workpiece;

[0041] Among them, the pickling device includes a base 2 arranged on the left and right sides of the pickling tank 1, and a hydraulic lifting cylinder 3 is arranged on the base 2. The upper end of the piston rod of the hydraulic lifting cylinder 3 is fixedly connected to the lower end of the cover plate 4. The cover plate 4 is located directly above the pickling tank 1 and its size matches the size of the pickling tank 1; four columns 41 distributed in a rectangular shape are arranged at the lower end of the cover plate 4, and the distance between the left and right columns 41 is greater than the length of the workpiece; a plurality of horizontally arranged support plates 42 are arranged between the columns 41, and the distance between adjacent support plates 42 is greater than the height of the workpiece; a plurality of pickling holes 43 are arranged on the support plate 42.

[0042] When in use, the cover plate 4 is moved up by the piston rod of the hydraulic lifting cylinder 3, and then the support plate 42 is moved out of the pickling tank 1, so that the steel plate workpiece is conveniently placed in each support plate 42, and then the piston rod of the hydraulic lifting cylinder 3 is retracted, and the support plate 42 and the workpiece are immersed in the pickling liquid of the pickling tank 1, and the cover plate 4 covers the pickling tank 1 at the same time, so as to avoid the escape of a large amount of acid mist generated during pickling and corrosion and damage to the factory building and equipment, and avoid pollution to the environment, thereby ensuring the health of the working people; at the same time, the acid mist that does not escape will gather above the pickling tank 1 to form larger droplets, and then re-integrate into the pickling liquid, reducing the loss of the pickling liquid while ensuring the concentration of the pickling liquid, thereby ensuring the quality of pickling and avoiding the situation of insufficient pickling; the setting of the pickling hole 43 can pickle the bottom surface of the workpiece, avoid the situation of insufficient pickling of the bottom surface of the workpiece, ensure the quality of pickling, and avoid the phenomenon of plating leakage caused by insufficient pickling.

[0043] As an embodiment of the present invention, the pickling solution is prefabricated by the following method: first, hydrochloric acid with a mass concentration of 30% is mixed with water in a volume ratio of 1:3 to prepare a base liquid, and then 0.5g of zinc sulfate, 9g of citric acid, 2g of sodium silicate and 6g of sodium dodecylbenzene sulfonate are added to each liter of the base liquid, and the mixture is stirred and mixed evenly. By adding citric acid, iron oxide can be dissolved to generate a complex of citric iron. Compared with inorganic acids, the acidity of citric acid is relatively weak, so the corrosion to the equipment is relatively small, the safety and reliability of citric acid cleaning is relatively strong, and the waste liquid is relatively easy to handle, and will not cause harm to the human body; at the same time, sodium dodecylbenzene sulfonate is added, which has a good degreasing power, so it can be used for one-time degreasing and rust removal, and has a good effect on removing oil and rust on the surface of the workpiece, reducing the degreasing process, thereby improving production efficiency, and sodium dodecylbenzene sulfonate can produce relatively rich foam, and can generate a stable and dense foam layer at the liquid surface, reduce the generation of acid mist, and greatly improve the production environment.

[0044] As an embodiment of the present invention, the pickling tank 1 is provided with a partition 12 arranged in the front-to-back direction, the partition 12 divides the pickling tank 1 into a pickling chamber 11 on the left and a mixing chamber 13 on the right, and a plurality of overflow grooves 14 connecting the pickling chamber 11 and the mixing chamber 13 are provided at the upper end of the partition 12; a circulating liquid pump 6 is fixedly provided on the front side of the pickling tank 1, the liquid inlet of the circulating liquid pump 6 is connected to the lower end of the pickling chamber 11 through a first liquid pipe 61, and the liquid outlet of the circulating liquid pump 6 is connected to the mixing chamber 13 through a second liquid pipe 62. The pickling liquid at the bottom of the pickling chamber 11 is drawn out by the circulating liquid pump 6 and discharged into the mixing chamber 13 for mixing, and the mixed pickling liquid is returned to the upper end of the pickling chamber 11 by overflow, thereby realizing the flow between the upper and lower layers of the pickling liquid in the pickling tank 1, avoiding the situation that the upper layer is under-pickled and the next layer is over-pickled due to the pickling liquid stratification phenomenon, and the flowing pickling liquid can also rinse the surface of the workpiece, increasing the pickling efficiency.

[0045] As an embodiment of the present invention, the second liquid pipe 62 is also connected to a steam pipe 63 near the liquid inlet of the circulating liquid pump 6, and the steam pipe 63 is connected to an external steam supply device, and a one-way valve is correspondingly arranged on the steam pipe 63. Through the arrangement of the steam pipe 63, on the one hand, the pickling liquid can be heated by supplementing steam, and the heating speed is fast, so as to ensure that the acidic liquid can be pickled at a better temperature, thereby improving the pickling efficiency; on the other hand, the steam entering the mixing chamber 13 through the second liquid pipe 62 can also achieve a better bubbling effect, which will not be conducive to the mixing of the acidic liquid in the mixing chamber 13, and can also generate more foam, reducing the probability of producing acid mist.

[0046] As an embodiment of the present invention, a mounting frame 5 is fixedly provided on the cover plate 4, and a motor 51 is provided on the mounting frame 5. The motor 51 extends to the bottom of the cover plate 4 through a first rotating shaft 56 and is rotatably connected to a rotating extrusion block 57; a horizontally arranged fixing plate 45 is provided between the columns 41, and the fixing plate 45 is arranged higher than the top support plate 42, and the fixing plate 45 is provided with a plurality of through holes on the rotation path of the rotating extrusion block 57, and a top column 46 capable of moving up and down is provided in the through hole, and the upper end of the top column 46 is connected to the upper end of the fixing plate 45 through a first spring 47; during the rotation process, the rotating extrusion block 57 can squeeze the top column 46 and cause it to move downward and collide with the top support plate 42 by inertia. The first rotating shaft 56 is driven to rotate by the motor 51, and then the rotating extrusion block 57 is driven to rotate, so that the rotating extrusion block 57 can squeeze the top column 46 downward. Under the action of inertia, the top column 46 overcomes the elastic force of the first spring 47 and continues to move downward to collide with the workpiece on the support plate 42, thereby causing the workpiece to vibrate, so that sufficient pickling liquid can enter the gap between the workpiece and the support plate 42, further avoiding the plating leakage caused by insufficient pickling. At the same time, the vibration will also accelerate the shedding of rust and improve the pickling effect.

[0047] As an embodiment of the present invention, a silicone sleeve is provided at the lower end of the top column 46 to prevent deformation or damage to the workpiece when the top column 46 collides with the workpiece. The silicone sleeve can prevent deformation or damage to the workpiece when the top column 46 collides with the workpiece. At the same time, when the height of the workpiece is high, the silicone sleeve can be deformed to allow the top column 46 to continue to move downward, thereby avoiding the rotating extrusion block 57 and avoiding jamming.

[0048] As an embodiment of the present invention, a vertically arranged baffle 48 is provided on the left side of the support plate 42, and a push plate 44 is provided on the left side of the upper end of the support plate 42, and the push plate 44 and the baffle 48 are connected by a plurality of second springs 49; a vertically arranged second rotating shaft 54 ​​is provided on the right side of the support plate 42, and a cam 55 corresponding to each push plate 44 is provided on the second rotating shaft 54; the second rotating shaft 54 ​​extends through the cover plate 4 to the upper end of the cover plate 4 and is connected to the second gear 53, and the first rotating shaft 56 is provided with a first gear 52 meshing with the second gear 53. By setting the baffle 48, the second spring 49, the push plate 44 and the cam 55, when the first rotating shaft 56 rotates, the cooperation of the first gear 52 and the second gear 53 can drive the second rotating shaft 54 ​​to rotate, thereby causing the cam 55 to rotate. The cooperation of the cam 55 and the second spring 49 can realize the periodic left and right movement of the workpiece on the support plate 42, thereby allowing the lower surface of the workpiece to achieve more sufficient pickling, thereby avoiding the plating leakage caused by insufficient pickling. At the same time, the movement of the workpiece itself also accelerates the disturbance of the pickling liquid, thereby improving the pickling quality. In addition, the left and right movement of the workpiece enables its upper and lower surfaces to be better flushed, which is beneficial to the separation of rust and improves the efficiency of subsequent pickling.

[0049] As an embodiment of the present invention, a first annular suction box 73 matching the upper opening of the pickling chamber 11 is provided on the left side of the lower end of the cover plate 4, and the side wall of the first annular suction box 73 is in contact with the inner wall of the pickling chamber 11; a second annular suction box 74 matching the upper opening of the mixing chamber 13 is provided on the right side of the lower end of the cover plate 4, and the side wall of the second annular suction box 74 is in contact with the inner wall of the mixing chamber 13. By providing the first annular suction box 73 and the second annular suction box 74, surface sealing can be achieved by the side wall thereof being in contact with the inner wall of the pickling chamber 11 or the mixing chamber 13, thereby further reducing the probability of acid mist escaping.

[0050] As an embodiment of the present invention, the first annular suction box 73 and the second annular suction box 74 are both provided with an annular sealing groove 76 on their outer peripheries, and a sealing ring is provided in the sealing groove 76. The provision of the sealing groove 76 and the sealing ring can further reduce the probability of acid mist escaping, thereby preventing a large amount of acid mist generated during pickling from escaping and causing corrosion and damage to the plant and equipment, avoiding pollution to the environment, and ensuring the health of the working people.

[0051] As an embodiment of the present invention, the inner walls of the first annular suction box 73 and the second annular suction box 74 are both provided with a plurality of suction holes 75, and a circulating air pump 7 is fixedly provided on the right side of the upper end of the cover plate 4, and the air inlet of the circulating air pump 7 is connected with the second annular suction box 74 and the first annular suction box 73 in sequence through the first air pipe 71; the air outlet of the circulating air pump 7 is connected with a plurality of air outlet boxes 77 fixed under the cover plate 4 through the second air pipe 72, and the air outlet box 77 is located between the first annular suction box 73 and the second annular suction box 74 and is arranged opposite to the overflow groove 14, and the lower end of the air outlet box 77 is arranged with the left side higher and the right side lower and is provided with a plurality of air outlet holes 78, and the air outlet holes 78 are located below the liquid surface. By setting the circulating air pump 7, the acid mist floating above the pickling chamber 11 and the mixing chamber 13 can be sucked in through the air suction hole 75, and then the acid mist enters the air outlet box 77 through the first air pipe 71, the circulating air pump 7 and the second air pipe 72 and enters the pickling liquid through the air outlet, so as to realize the recovery of the acid mist, reduce the risk of acid mist escape and reduce the loss of pickling liquid, thereby ensuring the pickling quality; at the same time, since the air outlet 78 can spray acid mist at the lower left, it can also accelerate the generation of foam at the liquid surface and reduce the generation of acid mist. In addition, the air flow sprayed from the air outlet 78 also has a leftward thrust, which can push the foam to one side of the pickling chamber 11, so that there is enough foam on the liquid surface of the pickling chamber 11, further reducing the generation of acid mist.

[0052] As an embodiment of the present invention, an acid mist recovery pipeline with a back pressure valve is also provided on the cover plate 4 above the mixing chamber 13, and the acid mist recovery pipeline is connected to an external acid mist recovery device. Through the setting of the back pressure valve, it can be opened to release the pressure when the pressure in the pickling tank 1 is too high, thereby ensuring that the pickling device can operate normally; the acid mist after pressure relief is recovered through the acid mist recovery pipeline, and then the use of new acid is reduced through the secondary use of the acid mist, thereby reducing costs.

[0053] When in use, the cover plate 4 is moved up by the piston rod of the hydraulic lifting cylinder 3, and then the support plate 42 is moved out of the pickling tank 1, so that the steel plate workpiece is conveniently placed on each support plate 42, and then the piston rod of the hydraulic lifting cylinder 3 is retracted, and the support plate 42 and the workpiece are immersed in the pickling liquid of the pickling tank 1, and the cover plate 4 covers the pickling tank 1 at the same time, so as to avoid the large amount of acid mist generated during pickling from escaping and causing corrosion and damage to the factory building and equipment, and to avoid pollution to the environment, thereby ensuring the health of the working people; at the same time, the acid mist that does not escape will gather above the pickling tank 1 to form larger droplets, which will be reintegrated into the pickling liquid, reducing the loss of the pickling liquid while ensuring the concentration of the pickling liquid, thereby ensuring the quality of pickling and avoiding the situation of insufficient pickling; through pickling The setting of hole 43 can pickle the bottom surface of the workpiece, avoid the situation that the bottom surface of the workpiece is under-pickled, ensure the quality of pickling, and avoid the phenomenon of plating leakage caused by insufficient pickling; by adding citric acid, iron oxide can be dissolved to generate a citric iron complex. Compared with inorganic acids, the acidity of citric acid is relatively weak, so the corrosion to the equipment is relatively small. The safety and reliability of citric acid cleaning are relatively strong, and the waste liquid is relatively easy to handle, and it will not cause harm to the human body; at the same time, adding sodium dodecylbenzene sulfonate has good degreasing power, so it can perform one-time degreasing and rust removal, and has a good effect on removing oil and rust on the surface of the workpiece, reducing the degreasing process, thereby improving production efficiency, and sodium dodecylbenzene sulfonate can produce a relatively rich The rich foam can generate a stable and dense foam layer at the liquid surface, reduce the generation of acid mist, and greatly improve the production environment; the pickling liquid at the bottom of the pickling chamber 11 is extracted by the circulating liquid pump 6 and discharged into the mixing chamber 13 for mixing, and the mixed pickling liquid is returned to the upper end of the pickling chamber 11 by overflow, thereby realizing the flow between the upper and lower layers of the pickling liquid in the pickling tank 1, avoiding the stratification of the pickling liquid, resulting in the upper layer being under-pickled and the next layer being over-pickled, and the flowing pickling liquid can also rinse the surface of the workpiece to increase the pickling efficiency; through the setting of the steam pipe 63, on the one hand, the pickling liquid can be heated by supplementing steam, and the heating speed is fast, ensuring that the acidic liquid can be pickled at a better temperature, thereby improving the pickling efficiency. Efficiency; on the other hand, steam entering the mixing chamber 13 through the second liquid pipe 62 can also achieve a good bubbling effect, which will not be conducive to the mixing of the acidic liquid in the mixing chamber 13, and can also generate more foam, reducing the production probability of acid mist; the first rotating shaft 56 is driven to rotate by the motor 51, and then the rotating extrusion block 57 is driven to rotate, so that the rotating extrusion block 57 can squeeze the top column 46 downward, and the top column 46 overcomes the elastic force of the first spring 47 under the action of inertia and continues to move downward to collide with the workpiece on the support plate 42, thereby causing the workpiece to vibrate, and then the gap between the workpiece and the support plate 42 can enter sufficient pickling liquid, further avoiding the phenomenon of plating leakage caused by insufficient pickling, and at the same time, the vibration will accelerate the shedding of rust, thereby improving the pickling effect;By setting the silicone sleeve, it is possible to prevent the top column 46 from colliding with the workpiece and causing deformation or damage to the workpiece. At the same time, when the workpiece is at a high height, the silicone sleeve can be deformed to allow the top column 46 to continue to move downward, thereby avoiding the rotating extrusion block 57 and avoiding jamming. By setting the baffle 48, the second spring 49, the push plate 44 and the cam 55, when the first rotating shaft 56 rotates, the second rotating shaft 54 ​​can be driven to rotate through the cooperation of the first gear 52 and the second gear 53, thereby causing the cam 55 to rotate. The cooperation of the cam 55 and the second spring 49 can realize the periodic left and right movement of the workpiece on the support plate 42. The workpiece moves so that the lower surface of the workpiece can be pickled more fully, avoiding the plating leakage caused by insufficient pickling. At the same time, the movement of the workpiece itself also accelerates the disturbance of the pickling liquid, thereby improving the pickling quality. In addition, the left and right movement of the workpiece allows the upper and lower surfaces to be better washed, which is conducive to the separation of rust and improves the efficiency of subsequent pickling. By setting the first annular suction box 73 and the second annular suction box 74, the surface sealing can be achieved by the way that the side walls thereof are fitted with the inner wall of the pickling chamber 11 or the mixing chamber 13, further reducing the probability of acid mist escaping. By sealing the sealing groove 76 and The setting of the sealing ring can further reduce the probability of acid mist escaping, thereby preventing a large amount of acid mist generated during pickling from escaping and causing corrosion and damage to the factory building and equipment, avoiding pollution to the environment, and ensuring the health of the working people; through the setting of the circulating air pump 7, the acid mist floating above the pickling chamber 11 and the mixing chamber 13 can be sucked in through the suction hole 75, and then the acid mist enters the air outlet box 77 through the first air pipe 71, the circulating air pump 7 and the second air pipe 72 and enters the pickling liquid through the air outlet, so as to realize the recovery of the acid mist, reduce the risk of acid mist escaping and reduce the loss of the pickling liquid, thereby ensuring the pickling quality; at the same time, since the air outlet 78 can spray acid mist at the lower left, it can also accelerate the generation of foam at the liquid surface and reduce the generation of acid mist. In addition, the airflow sprayed from the air outlet 78 also has a thrust to the left, which can push the foam to the side of the pickling chamber 11, so that there is enough foam on the liquid surface of the pickling chamber 11, further reducing the generation of acid mist; through the setting of the back pressure valve, it can be opened to release pressure when the pressure in the pickling tank 1 is too high, thereby ensuring that the pickling device can be carried out normally; the acid mist after pressure relief is recovered through the acid mist recovery pipeline, and then the use of new acid is reduced through the secondary use of acid mist, thereby reducing costs. ;

[0054] The above shows and describes the basic principles, main features and advantages of the present invention. It should be understood by those skilled in the art that the present invention is not limited to the above embodiments. The above embodiments and descriptions are only for explaining the principles of the present invention. Without departing from the spirit and scope of the present invention, the present invention may have various changes and improvements, which fall within the scope of the present invention. The scope of protection of the present invention is defined by the attached claims and their equivalents.

Claims

1. A high-strength alloyed steel plate hot-dip galvanizing process, characterized in that: The following steps are involved: S1, pickling: adding pickling liquid into the pickling tank (1), and adding a mist suppressant to suppress the escape of acid mist, and placing the workpiece plate into the pickling tank (1) through the pickling device for pickling, so as to achieve the purpose of removing the oxide scale and rust on the surface of the workpiece; S2, dipping in a plating agent: dipping the workpiece after pickling in step S1 into a plating agent to make it have a certain activity before dipping to avoid secondary oxidation and improve the bonding strength of subsequent galvanizing; S3, drying and preheating: putting the workpiece immersed in the plating agent in step S2 into an oven to prevent the workpiece from being deformed due to the rapid increase in temperature during immersion plating, and to remove residual moisture to prevent zinc explosion; S4, hot dip galvanizing: put the workpiece preheated in S3 into the galvanizing pot, control the zinc liquid temperature, immersion time and the speed of the workpiece being drawn out of the zinc liquid, and complete the galvanizing operation of the workpiece; The pickling device comprises a base (2) arranged on the left and right sides of the pickling tank (1), the base (2) is provided with a hydraulic lifting cylinder (3), the upper end of the piston rod of the hydraulic lifting cylinder (3) is fixedly connected to the lower end of the cover plate (4), the cover plate (4) is located directly above the pickling tank (1) and its size matches the size of the pickling tank (1); four columns (41) distributed in a rectangular shape are arranged at the lower end of the cover plate (4), and the spacing between the left and right columns (41) is greater than the length of the workpiece; a plurality of horizontally arranged support plates (42) are arranged between the columns (41), and the spacing between adjacent support plates (42) is greater than the height of the workpiece; a plurality of pickling holes (43) are arranged on the support plate (42); The pickling solution is prepared by the following method: firstly, hydrochloric acid with a mass concentration of 30% and water are mixed in a volume ratio of 1:3 to prepare a base liquid, and then 0.5g of zinc sulfate, 9g of citric acid, 2g of sodium silicate and 6g of sodium dodecylbenzene sulfonate are added to each liter of the base liquid, and the mixture is stirred and mixed evenly; The pickling tank (1) is provided with a partition (12) arranged in the front-to-back direction, the partition (12) divides the pickling tank (1) into a pickling chamber (11) on the left and a mixing chamber (13) on the right, and a plurality of overflow grooves (14) communicating with the pickling chamber (11) and the mixing chamber (13) are provided at the upper end of the partition (12); a circulating liquid pump (6) is fixedly provided outside the front side of the pickling tank (1), the liquid inlet of the circulating liquid pump (6) is communicated with the lower end of the pickling chamber (11) through a first liquid pipe (61), and the liquid outlet of the circulating liquid pump (6) is communicated with the mixing chamber (13) through a second liquid pipe (62); The second liquid pipe (62) is also connected to a steam pipe (63) near the liquid inlet of the circulating liquid pump (6), and the steam pipe (63) is connected to an external steam supply device. A one-way valve is correspondingly arranged on the steam pipe (63); A mounting frame (5) is fixedly arranged on the cover plate (4), and a motor (51) is arranged on the mounting frame (5). The motor (51) extends to the bottom of the cover plate (4) through a first rotating shaft (56) and is rotatably connected to a rotating extrusion block (57); a horizontally arranged fixing plate (45) is arranged between the uprights (41), and the fixing plate (45) is arranged higher than the uppermost support plate (42); a plurality of through holes are arranged on the fixing plate (45) on the rotation path of the rotating extrusion block (57), and a top column (46) capable of moving up and down is arranged in the through hole, and the upper end of the top column (46) is connected to the upper end of the fixing plate (45) through a first spring (47); during the rotation process, the rotating extrusion block (57) can squeeze the top column (46) and cause it to move downward and collide with the uppermost support plate (42) through inertia; The lower end of the top column (46) is sleeved with a silicone sleeve to prevent the top column (46) from colliding with the workpiece and causing deformation or damage to the workpiece; A vertically arranged baffle (48) is provided on the left side of the support plate (42), and a push plate (44) is provided on the left side of the upper end of the support plate (42), and the push plate (44) and the baffle (48) are connected via a plurality of second springs (49); a vertically arranged second rotating shaft (54) is provided on the right side of the support plate (42), and a cam (55) corresponding to each push plate (44) is provided on the second rotating shaft (54); the second rotating shaft (54) passes through the cover plate (4) and extends to the upper end of the cover plate (4) and is connected to the second gear (53), and the first rotating shaft (56) is provided with a first gear (52) meshing with the second gear (53); A first annular air suction box (73) matching the upper opening of the pickling chamber (11) is arranged on the left side of the lower end of the cover plate (4), and the side wall of the first annular air suction box (73) is in contact with the inner wall of the pickling chamber (11); a second annular air suction box (74) matching the upper opening of the mixing chamber (13) is arranged on the right side of the lower end of the cover plate (4), and the side wall of the second annular air suction box (74) is in contact with the inner wall of the mixing chamber (13); The first annular air suction box (73) and the second annular air suction box (74) are both provided with an annular sealing groove (76) on their outer circumferences, and a sealing ring is provided in the sealing groove (76); The inner walls of the first annular suction box (73) and the second annular suction box (74) are both provided with a plurality of suction holes (75); a circulating air pump (7) is fixedly provided on the right side of the upper end of the cover plate (4); the air inlet of the circulating air pump (7) is connected with the second annular suction box (74) and the first annular suction box (73) in sequence through a first air pipe (71); the air outlet of the circulating air pump (7) is connected with a plurality of air outlet boxes (77) fixed below the cover plate (4) through a second air pipe (72); the air outlet box (77) is located between the first annular suction box (73) and the second annular suction box (74) and is arranged opposite to the overflow groove (14); the lower end of the air outlet box (77) is arranged with the left side higher and the right side lower and is provided with a plurality of air outlet holes (78); the air outlet holes (78) are located below the liquid surface; An acid mist recovery pipeline with a back pressure valve is also provided on the cover plate (4) above the mixing chamber (13), and the acid mist recovery pipeline is connected to an external acid mist recovery device; The piston rod of the hydraulic lifting cylinder (3) is used to push up the cover plate (4), thereby moving the support plate (42) out of the pickling tank (1), so that the steel plate workpieces can be placed in each support plate (42), and then the piston rod of the hydraulic lifting cylinder (3) is retracted to immerse the support plate (42) and the workpieces in the pickling liquid of the pickling tank (1), and at the same time, the cover plate (4) covers the pickling tank (1); the motor (51) drives the first rotating shaft (56) to rotate, thereby driving the rotating extrusion block (57) to rotate, so that the rotating extrusion block (57) can press the top column (46) downward, and the top column (46) overcomes the elastic force of the first spring (47) under the action of inertia and continues to move downward to collide with the workpiece on the uppermost support plate (42), thereby causing the workpiece to vibrate, so that the gap between the workpiece and the uppermost support plate (42) can enter sufficient pickling liquid, further avoiding the plating leakage phenomenon caused by insufficient pickling, and at the same time, the vibration will also accelerate the shedding of rust; By setting the baffle plate (48), the second spring (49), the push plate (44) and the cam (55), when the first rotating shaft (56) rotates, the cooperation of the first gear (52) and the second gear (53) can drive the second rotating shaft (54) to rotate, thereby causing the cam (55) to rotate. The cooperation of the cam (55) and the second spring (49) can realize the periodic left-right movement of the workpiece on the support plate (42), thereby enabling the lower surface of the workpiece to achieve more sufficient pickling, thereby avoiding the plating leakage caused by insufficient pickling. At the same time, the movement of the workpiece itself also accelerates the disturbance of the pickling liquid, thereby improving the pickling quality. In addition, the left-right movement of the workpiece enables the upper and lower surfaces of the workpiece to be better washed, thereby facilitating the separation of rust. The pickling liquid at the bottom of the pickling chamber (11) is drawn out by a circulating liquid pump (6) and discharged into the mixing chamber (13) for mixing. The mixed pickling liquid then returns to the upper end of the pickling chamber (11) by overflow, thereby achieving the flow between the upper and lower layers of the pickling liquid in the pickling tank (1), avoiding the situation where the upper layer is under-pickled and the next layer is over-pickled due to the stratification of the pickling liquid. At the same time, the flowing pickling liquid can also rinse the surface of the workpiece, thereby increasing the pickling efficiency. By setting the steam pipe (63), on the one hand, the pickling liquid can be heated by supplementing steam, and the heating speed is fast, thereby ensuring that the acidic liquid can be pickled at a better temperature, thereby improving the pickling efficiency. On the other hand, the steam entering the mixing chamber (13) through the second liquid pipe (62) can also achieve a better bubbling effect, which will not be conducive to the mixing of the acidic liquid in the mixing chamber (13), and can also generate more foam, thereby reducing the probability of producing acid mist. By arranging the first annular suction box (73) and the second annular suction box (74), surface sealing can be achieved by the side wall thereof being fitted with the inner wall of the pickling chamber (11) or the mixing chamber (13), thereby further reducing the probability of acid mist escaping; by arranging the sealing groove (76) and the sealing ring, the probability of acid mist escaping can be further reduced; by arranging the circulating air pump (7), the acid mist floating above the pickling chamber (11) and the mixing chamber (13) can be sucked in through the suction hole (75), and then the acid mist is discharged through the first air pipe (71), the circulating air pump (7) and the mixing chamber (13). The second air pipe (72) enters the air outlet box (77) and enters the pickling liquid through the air outlet, so as to realize the recovery of acid mist, reduce the risk of acid mist escaping and reduce the loss of pickling liquid, thereby ensuring the pickling quality; at the same time, since the air outlet (78) can spray acid mist at the lower left, it can also accelerate the generation of foam at the liquid surface and reduce the generation of acid mist. In addition, the air flow sprayed from the air outlet (78) also has a leftward thrust, which can push the foam to one side of the pickling chamber (11), so that there is enough foam on the liquid surface of the pickling chamber (11), further reducing the generation of acid mist.

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