A zinc fume collection device and method for hot dip galvanizing

Abstract

The application discloses a zinc fume collecting device for hot-dip galvanizing, and a zinc fume collecting method for hot-dip galvanizing, and belongs to the technical field of hot-dip galvanizing. A bottom side air suction duct is arranged at the side of a zinc pot edge, top air suction ducts are oppositely arranged at the two sides above the zinc pot, the bottom side air suction duct is provided with an opening and closing valve I, the two top air suction ducts are connected with two branch pipes of a three-way pipe joint, the main pipe of the three-way pipe joint is provided with an opening and closing valve II, the opening and closing valve I and the opening and closing valve II are connected with a collecting air bellow, the collecting air bellow is connected with a bag-type dust collector, the opening and closing valve I and the opening and closing valve II are controlled to realize the opening and closing control of the air ducts above and below the zinc pot and the air volume distribution, the top air suction ducts are arranged to provide a zinc fume suction port above the zinc-plated workpiece, so that the zinc fume rising along the surface of the zinc-plated workpiece can be directly sucked and collected without being fully mixed with air, and the collecting efficiency is high.

Description

Technical Field

[0001] This invention belongs to the field of hot-dip galvanizing technology, and particularly relates to a zinc fume collection device and method for hot-dip galvanizing. Background Technology

[0002] Currently, in hot-dip galvanizing production lines, manufacturers typically use overhead cranes within the galvanizing workshop to transport workpieces. The workpieces to be galvanized are placed into the zinc bath for the hot-dip galvanizing process. Hot-dip galvanizing usually includes processes such as feeding, galvanizing, cooling, and passivation. During the hot-dip galvanizing process, the overhead crane suspends the workpieces to be galvanized as they descend. The contact between the workpieces and the molten zinc generates zinc fumes, which are highly hazardous to human health. To manage zinc fumes at the work site, some hot-dip galvanizing production lines install zinc fume collection ports on one side of the zinc bath. The outside of the zinc bath is enclosed with high-temperature resistant cloth to prevent zinc fume overflow, forming a side-suction dust collection method. However, the inventors believe that when hot-dip galvanizing long pipes, zinc fumes rise rapidly along the pipe walls, especially within the pipe cavity, which also has a guiding effect on the high-temperature zinc fumes. The side-suction dust collection device can only effectively remove fumes through prolonged suction and dilution by air convection, resulting in extremely low fume removal efficiency. Therefore, it is necessary to design a zinc fume collection device and method for hot-dip galvanizing.

[0003] It should be noted that the information disclosed in the background section above is only used to enhance the understanding of the background of this disclosure, and therefore may include information that does not constitute prior art. Summary of the Invention

[0004] The inventors discovered through research that when hot-dip galvanizing long pipes, zinc fumes rise rapidly along the pipe wall, especially in the pipe cavity, where they also guide the high-temperature zinc fumes. The side-suction dust removal zinc fume collection device can only complete the fume removal by long-term suction and dilution of zinc fumes by air convection, resulting in extremely low fume removal efficiency.

[0005] In view of at least one of the above technical problems, this disclosure provides a zinc fume collection device and method for hot-dip galvanizing, the specific technical solution of which is as follows:

[0006] A zinc fume collection device for hot-dip galvanizing includes two top-suction ducts arranged opposite each other, and a collecting air box; the top-suction ducts are provided with exhaust ports and smoke extraction ports; the collecting air box is provided with a lower suction port and an upper suction port; the lower suction port is equipped with an on / off valve I, which is connected to a bottom side suction duct; the upper suction port is equipped with an on / off valve II, which is connected to the main pipe of a three-way pipe joint, and the two branch pipes of the three-way pipe joint respectively form air passages with the exhaust ports of one of the top-suction ducts.

[0007] In some embodiments of this disclosure, the top suction duct is a linear long pipe, and several smoke extraction ports are provided, which are located on the side and / or bottom surface of the top suction duct.

[0008] In some embodiments of this disclosure, the top suction duct is equipped with a lifting and traction device, and the lower part of the top suction duct is equipped with a fireproof roller shutter that can be vertically extended and retracted.

[0009] In some embodiments of this disclosure, the inner side of the top suction duct is provided with a fireproof curtain that can be extended laterally.

[0010] In some embodiments of this disclosure, the lifting traction device includes a bracket disposed on the outer side of both ends of the top suction duct, a traction mechanism disposed on the bracket, the traction mechanism including a motor and traction components connected to both ends of the top suction duct; a guide rail is vertically disposed on the bracket, and moving components that are matched with the guide rail are respectively disposed at both ends of the top suction duct.

[0011] In some embodiments of this disclosure, the exhaust port includes an exhaust pipe extending to one side of the top suction duct, and a branch pipe of the tee pipe joint is connected to a ventilation hose, which is connected to a connecting pipe for connecting the exhaust pipe.

[0012] In some embodiments of this disclosure, the outer end of the connecting pipe is provided with an airtight component, which is a sealing ring and / or a sealing strip.

[0013] In some embodiments of this disclosure, the bracket further includes isolation doors located on the outer sides of both ends of the top suction duct. The isolation door near the exhaust pipe has a window that matches the exhaust pipe. A piston cylinder is connected to the outer side of the window, and the piston rod of the piston cylinder is connected to the side wall of the connecting pipe.

[0014] In some embodiments of this disclosure, the bracket and the outer surface of the docking pipe form a linear guide pair structure.

[0015] In some embodiments of this disclosure, the support is provided with track wheels, and the bottom surface of the connecting pipe is provided with a linear track that matches the track wheels.

[0016] In some embodiments of this disclosure, the shut-off valve I and / or shut-off valve II are butterfly valves.

[0017] A method for collecting zinc fumes for hot-dip galvanizing includes a bottom side-suction duct along the side of the zinc pot rim and top-suction ducts on opposite sides above the zinc pot. The bottom side-suction duct is equipped with an on / off valve I. The two top-suction ducts are connected to two branch pipes of a T-joint. The main pipe of the T-joint is equipped with an on / off valve II. On / off valves I and II are connected to a collecting air box, which is connected to a bag filter. The on / off control of the upper and lower air ducts of the zinc pot and the air volume distribution are achieved by controlling on / off valves I and II as needed.

[0018] In some embodiments of this disclosure, brackets are provided on the outer sides of both ends of the top suction duct, and a lifting traction mechanism for pulling the top suction duct is provided on the brackets. When the part to be galvanized is hoisted in or out, the traction mechanism controls the top suction duct to descend as needed, providing a passageway for the part to be galvanized; when the part to be galvanized is being galvanized, the traction mechanism controls the top suction duct to rise to the required height as needed, providing a zinc fume collection function for the part to be galvanized.

[0019] Compared with the prior art, the present invention has the following beneficial effects:

[0020] By setting up a top-suction air duct, a smoke extraction port located above is provided for the parts to be galvanized, so that the zinc fumes rising along the surface of the parts to be galvanized can be directly extracted and collected without being fully mixed with air, resulting in high collection efficiency.

[0021] By combining the air box and the lower and upper air inlets, a single bag filter can be used to collect zinc fumes from specific locations on the side and top of the zinc pot. The on / off control of the upper and lower air ducts of the zinc pot and the distribution of air volume can be achieved by controlling the on / off valves I and II as needed. Attached Figure Description

[0022] Figure 1 This is a three-dimensional schematic diagram of the top suction duct from one perspective in Embodiment 3 of the present invention.

[0023] Figure 2 for Figure 1 A magnified view of part A in the middle;

[0024] Figure 3 This is a top view of Example 3;

[0025] Figure 4 for Figure 3 A magnified view of part B in the middle section;

[0026] Figure 5 for Figure 4 A schematic diagram from a mid-CC perspective;

[0027] Figure 6 for Figure 5 A magnified view of part D in the middle;

[0028] Figure 7 This is a three-dimensional schematic diagram of the ventilation hose and connecting pipe portion in Embodiment 3 of the present invention;

[0029] Figure 8 for Figure 7 Front view illustration;

[0030] Figure 9 This is a three-dimensional schematic diagram from one perspective of Embodiment 3 of the present invention.

[0031] Figure 10 for Figure 9 A magnified view of part E in the middle;

[0032] The following are the labels in the diagram: 1. Top suction duct; 11. Smoke extraction port; 12. Fireproof roller shutter; 13. Fireproof curtain; 14. Smoke exhaust pipe; 2. Collecting air box; 31. Shut-off valve I; 32. Shut-off valve II; 4. Bottom side suction duct; 51. T-joint; 52. Ventilation hose; 53. Connecting pipe; 531. Airtight component; 532. Linear track; 6. Lifting traction device; 61. Support frame; 611. Track wheel; 62. Piston cylinder. Detailed Implementation

[0033] To better understand the purpose, structure, and function of this invention, the technical solutions in the embodiments of this invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this invention, and not all embodiments.

[0034] The component numbers used in this document are solely for distinguishing the objects described and have no sequential or technical meaning. The term "connection" in this disclosure, unless otherwise specified, includes both direct and indirect connections. In the description of this application, it should be understood that directional terms such as "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," and "counterclockwise" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. These terms are used solely for the convenience of describing this application and for a brief description, and do not indicate or imply that the device or unit referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application.

[0035] As shown in the attached diagram. Figures 1 to 10As shown, a zinc fume collection device for hot-dip galvanizing is designed, including two top-suction ducts 1 arranged opposite each other and a collecting air box 2. The two top-suction ducts 1 are mirror-arranged. The arrangement of the top-suction ducts 1 provides a smoke extraction port located above the workpiece to be galvanized, allowing the zinc fume rising along the surface of the workpiece to be directly sucked up and collected without sufficient mixing with air, resulting in high collection efficiency. The top-suction ducts 1 are provided with a smoke exhaust port and a smoke extraction port 11. The smoke extraction port 11 is used to draw zinc fume into the top-suction ducts 1, and the smoke exhaust port is used to guide the zinc fume into the collecting air box 2. The collecting air box 2 is provided with a lower suction port and an upper suction port. The lower suction port is equipped with... An on / off valve I 31 is provided, which is connected to a bottom side suction duct 4 located on one side of the zinc pot's edge. An on / off valve II 32 is provided at the top suction port, which is connected to the main pipe of a three-way pipe joint 51. The two branch pipes of the three-way pipe joint 51 form air passages with the exhaust ports of a top suction duct 1. By combining the air box 2 and the bottom and top suction ports, a bag filter can be used to collect zinc fumes from specific locations on the side and top of the zinc pot. The on / off control of the upper and lower air ducts and the distribution of air volume can be achieved by controlling the on / off valves I and II as needed.

[0036] A method for collecting zinc fumes for hot-dip galvanizing is also disclosed. A bottom side suction duct 4 is set on the side of the zinc pot rim, and top suction ducts 1 are set on opposite sides above the zinc pot. The bottom side suction duct 4 is equipped with an on / off valve I 31. The two top suction ducts 1 are connected to two branch pipes of a three-way pipe joint 51. The main pipe of the three-way pipe joint 51 is equipped with an on / off valve II 32. The on / off valves I 31 and II 32 are connected to a collecting air box 2. The collecting air box 2 is connected to a bag filter dust collector. The on / off of the upper and lower air ducts of the zinc pot and the air volume distribution are realized by controlling the on / off valves I 31 and II 32 as needed.

[0037] The above embodiments illustrate three examples of implementing the above technical solutions: Example 1

[0038] This embodiment discloses a zinc fume collection device for hot-dip galvanizing, comprising two top-suction ducts 1 arranged opposite each other and a collecting air box 2. The two top-suction ducts 1 are mirror-arranged, and the arrangement of the top-suction ducts 1 provides a fume extraction port located above the workpiece to be galvanized, allowing the zinc fume rising along the surface of the workpiece to be directly extracted and collected without sufficient mixing with air, resulting in high collection efficiency. The top-suction ducts 1 are provided with an exhaust port and an extraction port 11. The extraction port 11 is used to draw zinc fume into the top-suction ducts 1, and the exhaust port is used to guide the zinc fume into the collecting air box 2. The collecting air box 2 is provided with a lower suction port and an upper suction port. The lower suction port is equipped with... An on / off valve I 31 is provided, which is connected to a bottom side suction duct 4 located on one side of the zinc pot's edge. An on / off valve II 32 is provided at the top suction port, which is connected to the main pipe of a three-way pipe joint 51. The two branch pipes of the three-way pipe joint 51 form air passages with the exhaust ports of a top suction duct 1. By combining the air box 2 and the bottom and top suction ports, a bag filter can be used to collect zinc fumes from specific locations on the side and top of the zinc pot. The on / off control of the upper and lower air ducts and the distribution of air volume can be achieved by controlling the on / off valves I and II as needed.

[0039] A method for collecting zinc fumes for hot-dip galvanizing is also disclosed. A bottom side suction duct 4 is set on the side of the zinc pot rim, and top suction ducts 1 are set on opposite sides above the zinc pot. The bottom side suction duct 4 is equipped with an on / off valve I 31. The two top suction ducts 1 are connected to two branch pipes of a three-way pipe joint 51. The main pipe of the three-way pipe joint 51 is equipped with an on / off valve II 32. The on / off valves I 31 and II 32 are connected to a collecting air box 2. The collecting air box 2 is connected to a bag filter dust collector. The on / off of the upper and lower air ducts of the zinc pot and the air volume distribution are realized by controlling the on / off valves I 31 and II 32 as needed.

[0040] The top suction duct 1 is a linear long pipe, and there are several smoke extraction ports 11. The smoke extraction ports 11 are located on the bottom surface of the top suction duct 1. The smoke extraction ports 11 closer to the exhaust port have smaller diameters, and vice versa. The on / off valve I 31 and / or on / off valve II 32 are gate valves. Example 2

[0041] This embodiment discloses a zinc fume collection device for hot-dip galvanizing. The difference between this embodiment and Embodiment 1 is that the top suction duct 1 is a linear long pipe, and several smoke extraction ports 11 are provided. The smoke extraction ports 11 are located on the inner side of the top suction duct 1 and are waist-shaped holes. The top suction duct 1 is equipped with a lifting traction device 6, which is a workshop crane. The exhaust port includes an exhaust pipe 14 extending to one side of the top suction duct 1. The branch pipe of the three-way pipe joint 51 is connected to a ventilation hose 52. In this embodiment, the ventilation hose 52 can be a folded pipe. The ventilation hose 52 is connected to a connecting pipe 53 for connecting the exhaust pipe 14. The outer end of the connecting pipe 53 is equipped with an airtight component 531 for sealing. The airtight component 531 is a sealing ring and / or a sealing strip. In this embodiment, the airtight component 531 is a sealing strip, which can be a hollow sealing rubber strip. Example 3

[0042] like Figures 1 to 10 As shown, this embodiment discloses a zinc fume collection device for hot-dip galvanizing. The difference between this embodiment and Embodiment 2 is that the lower part of the top suction duct 1 is provided with a vertically retractable fireproof roller shutter 12. The fireproof roller shutter 12 is controlled by a motor for lifting and lowering. The lower end of the fireproof roller shutter 12 is provided with a counterweight. The curtain of the fireproof roller shutter 12 is made of high-temperature resistant fabric. The top suction duct 1 is equipped with a lifting traction device 6. The lifting traction device 6 includes brackets 61 located on the outer sides of both ends of the top suction duct 1. The brackets 61 are equipped with... The traction mechanism includes a motor and traction components connected to both ends of the top suction duct 1. In this embodiment, the traction component is a chain with one end fixed to the top suction duct 1. A guide rail is vertically provided on the bracket 61, and moving parts that cooperate with the guide rail are respectively provided at both ends of the top suction duct 1. In this embodiment, the moving parts can be guide rail wheels. A fireproof curtain 13 that can be horizontally extended is provided on the inner side of the top suction duct 1. When both the fireproof roller shutter 12 and the fireproof curtain 13 are extended, the sides and top of the zinc pot can be shielded.

[0043] The bracket 61 also includes isolation doors and support platforms located on the outer sides of both ends of the top suction duct 1. The isolation door near the exhaust pipe 14 has a window for use with the exhaust pipe 14. A piston cylinder 62 is connected to the outer side of the window. The piston rod of the piston cylinder 62 is connected to the side wall of the connecting pipe 53. When the piston rod of the piston cylinder 62 extends, the connecting pipe 53 can be fitted and connected with the exhaust pipe 14. When the piston rod of the piston cylinder 62 retracts, the connecting pipe 53 can be separated from the exhaust pipe 14. The on / off valve I 31 and the on / off valve II 32 are both butterfly valves.

[0044] In a further optimized design, the support platform of the bracket 61 and the outer surface of the connecting pipe 53 form a linear guide pair structure. That is, the support platform of the bracket 61 is provided with a moving part, and the lower surface of the connecting pipe 53 is provided with a guide member. The axis of the guide member points to the exhaust pipe 14. In this embodiment, the moving part is a track wheel 611 mounted on the support platform, and the guide member is a linear track 532 provided on the bottom surface of the connecting pipe 53 to match the track wheel 611. The track wheel 611 can be a grooved wheel, and the linear track 532 can be a V-shaped track made of angle steel.

[0045] Meanwhile, a zinc fume collection method for hot-dip galvanizing is also disclosed. Supports 61 are set on the outer sides of both ends of the top suction duct 1, and a lifting and traction mechanism for pulling the top suction duct 1 is set on the support 61. When the part to be galvanized is hoisted in or out, the traction mechanism controls the top suction duct 1 to descend as needed, providing a passageway for the part to be galvanized; when the part to be galvanized is being galvanized, the traction mechanism controls the top suction duct 1 to rise to the required height as needed, providing a zinc fume collection function for the part to be galvanized.

[0046] It is understood that the present invention has been described through some embodiments, and those skilled in the art will recognize that various changes or equivalent substitutions can be made to these features and embodiments without departing from the spirit and scope of the invention. Furthermore, under the teachings of the present invention, these features and embodiments can be modified to adapt to specific situations and materials without departing from the spirit and scope of the invention. Therefore, the present invention is not limited to the specific embodiments disclosed herein, and all embodiments falling within the scope of the claims of this application are within the protection scope of the present invention.

Claims

1. A zinc fume collection device for hot-dip galvanizing, characterized in that, It includes two top suction ducts (1) arranged opposite each other on the left and right, and a collecting air box (2); the top suction duct (1) is provided with a smoke exhaust port and a smoke extraction port (11); the collecting air box (2) is provided with a lower suction port and an upper suction port; the lower suction port is equipped with an on / off valve I (31), and the on / off valve I (31) is connected to a bottom side suction duct (4); the upper suction port is equipped with an on / off valve II (32), and the on / off valve II (32) is connected to the main pipe of a three-way pipe joint (51), and the two branch pipes of the three-way pipe joint (51) respectively form an air passage with the smoke exhaust port of one of the top suction ducts (1); The top suction duct (1) is equipped with a lifting traction device (6); The lifting traction device (6) includes a bracket (61) located on the outer side of both ends of the top suction duct (1). The bracket (61) is equipped with a traction mechanism, which includes a motor and traction components connected to both ends of the top suction duct (1). The bracket (61) is vertically equipped with a guide rail, and both ends of the top suction duct (1) are respectively equipped with moving components that are matched with the guide rail. The exhaust port includes an exhaust pipe (14) extending to one side of the top suction duct (1), and the branch pipe of the three-way pipe joint (51) is connected to a ventilation hose (52), and the ventilation hose (52) is connected to a connecting pipe (53) for connecting the exhaust pipe (14). The bracket (61) also includes isolation doors located on the outer sides of both ends of the top suction duct (1). The isolation door near the exhaust pipe (14) has a window for use with the exhaust pipe (14). A piston cylinder (62) is connected to the outer side of the window. The piston rod of the piston cylinder (62) is connected to the side wall of the docking pipe (53).

2. The zinc fume collection device for hot-dip galvanizing according to claim 1, characterized in that, The top suction duct (1) is a linear long pipe, and there are several smoke extraction ports (11), which are located on the side and / or bottom of the top suction duct (1).

3. The zinc fume collection device for hot-dip galvanizing according to claim 1, characterized in that, The lower part of the top suction duct (1) is provided with a fireproof roller shutter (12) that can be vertically extended and retracted.

4. The zinc fume collection device for hot-dip galvanizing according to claim 1 or 3, characterized in that, The inner side of the top suction duct (1) is provided with a horizontally retractable fireproof curtain (13).

5. The zinc fume collection device for hot-dip galvanizing according to claim 1, characterized in that, The outer end of the connecting pipe (53) is provided with an airtight component (531), which is a sealing ring and / or a sealing strip.

6. The zinc fume collection device for hot-dip galvanizing according to claim 1, characterized in that, The bracket (61) and the outer surface of the connecting pipe (53) form a linear guide pair structure.

7. The zinc fume collection device for hot-dip galvanizing according to claim 6, characterized in that, The support (61) is provided with a track wheel (611), and the bottom surface of the connecting pipe (53) is provided with a linear track (532) that matches the track wheel (611).

8. The zinc fume collection device for hot-dip galvanizing according to claim 1, characterized in that, The shut-off valve I (31) and / or shut-off valve II (32) are butterfly valves.

9. A method for collecting zinc fumes using the zinc fume collection device for hot-dip galvanizing according to any one of claims 1-8, characterized in that, Bottom side suction duct (4) is set on the side of the zinc pot rim, and top suction duct (1) is set on both sides above the zinc pot. Bottom side suction duct (4) is equipped with shut-off valve I (31). The two top suction ducts (1) are connected to the two branch pipes of a three-way pipe joint (51). The main pipe of the three-way pipe joint (51) is equipped with shut-off valve II (32). Shut-off valve I (31) and shut-off valve II (32) are connected to the collecting air box (2). The collecting air box (2) is connected to the bag filter. The opening and closing of the upper and lower air ducts of the zinc pot and the air volume distribution are realized by controlling shut-off valve I (31) and shut-off valve II (32) as needed.

10. The zinc fume collection method according to claim 9, characterized in that, Supports (61) are installed on the outer sides of both ends of the top suction duct (1). A traction mechanism for pulling the top suction duct (1) is installed on the support (61). When the part to be galvanized is hoisted in or out, the traction mechanism controls the top suction duct (1) to descend as needed, providing a passage for the part to be galvanized to enter and exit. When the part to be galvanized is being galvanized, the traction mechanism controls the top suction duct (1) to rise to the required height as needed, providing a zinc fume collection function for the part to be galvanized.

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