Process for spraying zinc on surface of micro-channel zinc-sprayed aluminum flat tube

Abstract

The invention belongs to the technical field of electric arc zinc spraying, and particularly relates to a micro-channel zinc spraying aluminum flat pipe surface zinc spraying technology, a used zinc spraying device comprises a spraying box, a cooling component and a preheating component, the cooling component is arranged at the right end of the interior of the spraying box, and the preheating component is arranged at the left end of the interior of the spraying box. According to the cooling device, the aluminum flat pipe subjected to electric arc zinc spraying is cooled through the cooling component, hot air flow is not generated through heat exchange, the hot air flow is made to conduct preheating treatment on the aluminum flat pipe not subjected to zinc spraying through the preheating component, and heat is reused; meanwhile, the screw pitch of the spiral spoiler is gradually reduced leftwards, that is, the airflow is gradually reduced along a spiral leftward channel of the spiral spoiler, so that the flowing speed of the airflow is gradually increased, the speed of hot airflow entering the preheating sleeve through the air inlet pipe, the purification box and the air outlet pipe is increased, and heat loss of the hot airflow in the flowing transmission process can be reduced; and the preheating effect on the aluminum flat pipe is improved.

Description

Technical Field

[0001] The invention belongs to the technical field of arc zinc spraying, and specifically relates to a surface zinc spraying process for a microchannel zinc spraying aluminum flat tube. Background Art

[0002] Thermal zinc spraying technology uses burning flames, electric arcs, plasma arcs, etc. as heat sources to heat the sprayed metal zinc to a plastic and molten state. At the same time, under the acceleration of high-speed airflow, the metal zinc is atomized and impacted on the surface of the pre-treated body, followed by rapid cooling and continuous layering to form a coating process. This process is usually used for the surface treatment of aluminum flat tubes. It mainly uses arc spraying in thermal spraying to melt the zinc wire and blow it to the surface of the aluminum flat tube through compressed air. The temperature drops rapidly from 4000℃ to form a dense zinc coating, which covers the surface of the aluminum flat tube. The coating can effectively isolate the aluminum from the outside to ensure that it is not damaged, because the metal zinc has good atmospheric corrosion resistance. The coating and the substrate are firmly assembled, the coating has a long life, and the long-term economic benefits are good.

[0003] After searching, the Chinese patent with publication number CN112647036A discloses an arc zinc spraying device for air-conditioning aluminum flat tubes, which can automatically adjust the spraying angle of the arc spray gun according to the state of the coating, and the aluminum flat tube can effectively cool down when passing through the cooling water tank. When the aluminum flat tube passes through the wiping wheel, the corner brush wheel can clean both sides of the aluminum flat tube to thoroughly clean the surface around the aluminum flat tube. The above device is cooled by the cooling water tank. As the heat exchange continues during the cooling process, the temperature of the cooling water inside the water tank rises, the cooling efficiency gradually decreases, and the heat absorbed by the cooling water cannot be reused, resulting in heat energy being wasted. Summary of the invention

[0004] The purpose of the present invention is to provide a microchannel zinc-sprayed aluminum flat tube surface zinc-sprayed process to solve the defects pointed out in the above background technology.

[0005] The present invention provides the following technical solution: a microchannel zinc-sprayed aluminum flat tube surface zinc-sprayed process, comprising the following steps:

[0006] S1: inserting the aluminum flat tube from the inlet at the left end of the spray box (100) of the zinc spraying device, and passing the aluminum flat tube through the interior of the preheating sleeve (303), then through the interior of the stop ring (102), and then through the interior of the baffle ring (2004), through the interior of the spiral spoiler (206), and finally out from the outlet at the right end of the cooling sleeve (201);

[0007] S2: During processing, the aluminum flat tube is pulled by an external traction device to slowly move rightward at a uniform speed, and four arc nozzles (500) jointly perform arc zinc spraying operation on the surface of the aluminum flat tube. As the aluminum flat tube moves rightward, the aluminum flat tube section sprayed with zinc moves rightward to the inside of the cooling jacket (201), and then two fans (208) blow air, and the air is sent into the inside of the cooling jacket (201) through the air duct (209) and the opened air inlet (207), so that an airflow flowing to the left is generated inside the cooling jacket (201), and the airflow flows to the left in a spiral manner through the spiral spoiler (206), and the flowing cold airflow continuously absorbs the heat from the surface of the aluminum flat tube that has just been sprayed with zinc;

[0008] S3: When the hot air flow passes through the inside of the purification box (301), the dust and some detached zinc powder in the air flow first pass through a plurality of preheating components (300) distributed up and down. Since the preheating components (300) generate a high-voltage electric field, the air flow is ionized under the action of the high-voltage electric field to generate cations and anions. The dust particles and zinc powder adsorb the anions and become negatively charged. The negatively charged dust particles and zinc powder are adsorbed by a plurality of positively charged adsorption plates (308) as they flow to the left with the air flow, thereby intercepting and filtering the dust and zinc powder in the air flow to prevent them from entering the inside of the preheating sleeve (303) along with the air flow.

[0009] The zinc spraying device comprises a spraying box, a cooling component and a preheating component, wherein the cooling component is arranged at the right end inside the spraying box, the preheating component is arranged at the left end inside the spraying box, and the preheating component passes through the top and bottom of the spraying box;

[0010] The cooling component includes a cooling jacket fixedly mounted on the right end of the interior of the spray box, a guide hood fixedly mounted on the left end of the cooling jacket, a standing plate fixedly mounted on the left end of the guide hood, the standing plate fixedly mounted on the inner wall of the spray box, a guide block fixedly mounted on the right side of the standing plate, a spiral spoiler fixedly mounted inside the cooling jacket, an air inlet opened on the right end of the top of the cooling jacket, an air duct fixedly mounted on the top of the air inlet, a fan fixedly mounted on the front and rear of the air duct, air holes opened on the top and bottom of the guide hood, and an air inlet pipe fixedly mounted on the top and bottom of the guide hood;

[0011] The preheating component includes two purification boxes fixedly installed on the top of the spray box and fixedly installed on the bottom of the spray box. The left end of each purification box is fixedly installed with an air outlet pipe, and the ends of the two air outlet pipes that are close to each other are jointly fixedly installed with a preheating sleeve, and the preheating sleeve is located at the inner left end of the spray box.

[0012] As a preferred solution of the present invention, the inner wall size of the cooling jacket gradually decreases toward the left, the size of the spiral spoiler gradually decreases toward the left, and the pitch of the spiral spoiler gradually decreases toward the left, and a discharge port compatible with the specifications of the aluminum flat tube is opened at the right end of the cooling jacket.

[0013] As a preferred solution of the present invention, the inner wall size of the guide cover gradually increases toward the left, the outer wall size of the guide block gradually increases toward the left, a baffle ring is fixedly installed on the inner wall of the guide block, the inner wall specifications of the baffle ring are compatible with the outer wall specifications of the aluminum flat tube, and a through hole is opened in the middle of the station plate, and the inner wall size of the through hole is larger than the inner wall size of the baffle ring.

[0014] As a preferred solution of the present invention, the preheating component also includes a dust removal assembly, which includes a plurality of corona electrode pieces fixedly mounted inside the purification box, the plurality of corona electrode pieces are evenly spaced up and down, and the plurality of corona electrode pieces are located on one side of the purification box close to the air inlet pipe, a plurality of slots evenly spaced front and back are provided on a side of the purification box away from the spray box, adsorption plates are plugged into the interior of the slots, the adsorption plates extend into the interior of the purification box, a fixed cover plate is fixedly mounted on a side of the plurality of adsorption plates away from the spray box, and the fixed cover plate is fastened to the surface of the purification box by bolts.

[0015] As a preferred solution of the present invention, the outer shell of the preheating sleeve is provided with a heat-insulating sleeve, and the heat-insulating sleeve is made of ceramic material.

[0016] As a preferred solution of the present invention, four arc nozzles are installed on the outer wall of the spray box by threaded fixing. The arc nozzles are respectively located at the four corners of the spray box, and the four arc nozzles extend into the interior of the spray box. The four arc nozzles are located on the left side of the station panel.

[0017] As a preferred solution of the present invention, a partition is fixedly installed inside the spray box, the partition is located on the left side of the arc nozzle, the partition is located on the right side of the insulation sleeve, and a stop ring is fixedly installed on the inner wall of the partition, and the inner size of the stop ring is compatible with the outer wall size of the aluminum flat tube.

[0018] As a preferred solution of the present invention, the inner wall size of the preheating sleeve is larger than the outer wall size of the aluminum flat tube, and the gap between the inner wall of the preheating sleeve and the outer wall of the aluminum flat tube is 1.5-1.8 cm.

[0019] As a preferred solution of the present invention, a plurality of rollers distributed left and right are rotatably mounted between the front wall and the rear wall of the spray box, and the height of the rollers is matched with the height of the cooling jacket and the height of the preheating jacket.

[0020] As a preferred solution of the present invention, the peripheries of the cooling jacket, the air guide cover, the air inlet duct, the purification box and the air outlet duct are all wrapped with a heat insulation layer.

[0021] Compared with the prior art, the present invention has the following beneficial effects:

[0022] 1. The present invention cools down the aluminum flat tube after arc zinc spraying by a cooling component, and does not generate a hot air flow by heat exchange, so that the hot air flow passes through the preheating component to preheat the aluminum flat tube that has not been sprayed with zinc, and the heat is reused. Since the left end of the cooling sleeve in the cooling device gradually shrinks, and the pitch of the spiral spoiler gradually decreases to the left, that is, the airflow gradually decreases along the spiral left channel of the spiral spoiler, the flow rate of the airflow gradually increases, so that the speed at which the hot air flow passes through the air inlet pipe, the purification box and the air outlet pipe into the interior of the preheating sleeve is accelerated, which can reduce the heat loss of the hot air flow during the flow transmission process and improve the preheating effect of the aluminum flat tube.

[0023] 2. The present invention sets a dust removal component in the preheating component so that when the hot air flow passes through the inside of the purification box, first, when the dust in the air flow and some detached zinc powder pass through a plurality of preheating components distributed up and down, the preheating components generate a high-voltage electric field, and the air flow is ionized under the action of the high-voltage electric field to generate cations and anions. The dust particles and zinc powder adsorb the anions and carry negative charges. The negatively charged dust particles and zinc powder are adsorbed by a plurality of positively charged adsorption plates as they flow to the left with the air flow, thereby intercepting and filtering the dust and zinc powder in the air flow to prevent them from entering the inside of the preheating sleeve along with the air flow.

[0024] 3. The left end of the cooling jacket of the present invention gradually shrinks, and the pitch of the spiral spoiler gradually decreases to the left, that is, the airflow gradually decreases along the channel of the spiral spoiler spiral to the left, so the flow velocity of the airflow gradually accelerates, and the dust and zinc powder partially attached to the surface of the corona electrode piece can be blown off under the faster flow velocity, ensuring that the dust and zinc entering the interior of the purification box later can be in good contact with the corona electrode piece and charged. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 A schematic diagram of the three-dimensional structure of the zinc spraying device used in the present invention from a first viewing angle;

[0026] Figure 2 A schematic diagram of the three-dimensional structure of the zinc spraying device used in the present invention from a second viewing angle;

[0027] Figure 3 It is a schematic diagram of the cross-sectional three-dimensional structure of the spray box of the zinc spray device used in the present invention;

[0028] Figure 4 It is a schematic diagram of the internal three-dimensional structure of the spray box of the zinc spray device used in the present invention;

[0029] Figure 5 It is a schematic diagram of the cross-sectional three-dimensional structure of the cooling jacket and the preheating jacket of the zinc spraying device used in the present invention;

[0030] Figure 6 It is a schematic diagram of the internal three-dimensional structure of the cooling jacket of the zinc spraying device used in the present invention;

[0031] Figure 7 It is a schematic diagram of the cross-sectional three-dimensional structure of the purification box of the zinc spraying device used in the present invention;

[0032] Figure 8 The three-dimensional structural schematic diagram of the air duct of the zinc spraying device used in the present invention;

[0033] Fig. 9 For the present invention Figure 5 Schematic diagram of the enlarged structure at point A in the middle.

[0034] In the figure: 100, spray box; 101, partition; 102, stop ring; 200, cooling component; 201, cooling jacket; 202, guide cover; 203, standing plate; 204, guide block; 2004, baffle; 205, air hole; 206, spiral spoiler; 207, air inlet; 208, fan; 209, air duct; 2010, air inlet pipe; 300, preheating component; 301, purification box; 302, air outlet pipe; 303, preheating jacket; 304, insulation jacket; 305, corona electrode; 306, slot; 307, fixed cover; 308, adsorption electrode; 500, arc nozzle; 600, roller. DETAILED DESCRIPTION

[0035] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0036] See also Figure 1-Figure 9 The technical solution provided by the present invention specifically includes the following embodiments:

[0037] Embodiment 1

[0038] A microchannel zinc spraying aluminum flat tube surface zinc spraying process, the zinc spraying device used includes a spray box 100, a cooling component 200 and a preheating component 300, the cooling component 200 is arranged at the right end of the interior of the spray box 100, the preheating component 300 is arranged at the left end of the interior of the spray box 100, and the preheating component 300 runs through the top and bottom of the spray box 100;

[0039] The cooling component 200 includes a cooling jacket 201 fixedly mounted on the right end of the inside of the spray box 100, a guide cover 202 fixedly mounted on the left end of the cooling jacket 201, a standing plate 203 fixedly mounted on the left end of the guide cover 202, the standing plate 203 fixedly mounted on the inner wall of the spray box 100, a guide block 204 fixedly mounted on the right side of the standing plate 203, a spiral spoiler 206 fixedly mounted inside the cooling jacket 201, an air inlet 207 is provided at the top right end of the cooling jacket 201, an air duct 209 is fixedly mounted on the top of the air inlet 207, a fan 208 is fixedly mounted on the front and rear of the air duct 209, and air holes 205 are provided on the top and bottom of the guide cover 202. The top and bottom of the air guide cover 202 are fixedly installed with an air inlet pipe 2010, the inner wall size of the cooling jacket 201 gradually decreases toward the left, the size of the spiral spoiler 206 gradually decreases toward the left, and the pitch of the spiral spoiler 206 gradually decreases toward the left, and a discharge port adapted to the specifications of the aluminum flat tube is provided at the right end of the cooling jacket 201, the inner wall size of the air guide cover 202 gradually increases toward the left, the outer wall size of the guide block 204 gradually increases toward the left, a baffle ring 2004 is fixedly installed on the inner wall of the guide block 204, the inner wall specifications of the baffle ring 2004 are adapted to the outer wall specifications of the aluminum flat tube, a through hole is provided in the middle of the standing plate 203, and the inner wall size of the through hole is larger than the inner wall size of the baffle ring 2004;

[0040] The preheating component 300 includes two purification boxes 301 fixedly installed on the top of the spray box 100 and fixedly installed on the bottom of the spray box 100. The left end of each purification box 301 is fixedly installed with an air outlet pipe 302. The ends of the two air outlet pipes 302 close to each other are jointly fixedly installed with a preheating sleeve 303. The preheating sleeve 303 is located at the left end of the interior of the spray box 100. The inner wall size of the preheating sleeve 303 is larger than the outer wall size of the aluminum flat tube, and the gap between the inner wall of the preheating sleeve 303 and the outer wall of the aluminum flat tube is 1.5 to 1.8 cm. The peripheries of the cooling jacket 201, the air guide cover 202, the air inlet pipe 2010, the purification box 301 and the air outlet pipe 302 are all wrapped with a heat insulation layer.

[0041] Four arc nozzles 500 are fixedly installed on the outer wall of the spray box 100 by screw threads. The arc nozzles 500 are respectively located at the four corners of the spray box 100, and the four arc nozzles 500 extend into the interior of the spray box 100. The four arc nozzles 500 are located on the left side of the station plate 203;

[0042] Specifically, the aluminum flat tube is inserted into the inlet at the left end of the spray box 100, and is passed through the interior of the preheating sleeve 303 in sequence, then through the interior of the stop ring 102, and then through the interior of the baffle ring 2004, and then through the interior of the spiral spoiler 206, and finally out of the outlet at the right end of the cooling sleeve 201. The aluminum flat tube is slowly moved to the right at a uniform speed by an external traction device, and four arc nozzles 500 jointly perform arc zinc spraying on the surface of the aluminum flat tube. As the aluminum flat tube moves to the right, the aluminum flat tube section sprayed with zinc moves to the right to the interior of the cooling sleeve 201, and then air is blown by two fans 208, and the air is sent into the interior of the cooling sleeve 201 through the air duct 209 and the opened air inlet 207, so that An airflow flowing to the left is generated inside the cooling sleeve 201, and the airflow flows to the left in a spiral through the spiral spoiler 206. The flowing cold airflow continuously absorbs the heat from the surface of the aluminum flat tube that has just been zinc-sprayed. On the one hand, the aluminum flat tube is cooled down quickly. On the other hand, after the cold airflow absorbs the heat of the aluminum flat tube, the airflow rises steadily due to heat exchange and becomes a hot airflow. Then, the airflow passes between the guide cover 202 and the guide block 204, flows through the two air holes 205 and the two air inlet pipes 2010 to the inside of the purification box 301, and then flows through the air outlet pipe 302 to the inside of the preheating sleeve 303. The hot air flows along the gap between the inner wall of the preheating sleeve 303 and the outer wall of the aluminum flat tube, thereby preheating the surface of the aluminum flat tube that has not been zinc-sprayed to avoid heat waste.

[0043] It should be additionally explained that, as the left end of the cooling sleeve 201 gradually shrinks and the pitch of the spiral spoiler 206 gradually decreases toward the left, that is, the airflow gradually decreases along the spiral left channel of the spiral spoiler 206, the flow rate of the airflow gradually increases, thereby accelerating the speed at which the hot air flow passes through the air inlet pipe 2010, the purification box 301 and the air outlet pipe 302 into the preheating sleeve 303, which can reduce the heat loss of the hot air flow during the flow transmission process and improve the preheating effect of the aluminum flat tube.

[0044] Embodiment 2

[0045] The preheating component 300 also includes a dust removal component, which includes a plurality of corona electrode pieces 305 fixedly mounted inside the purification box 301, the plurality of corona electrode pieces 305 are evenly spaced up and down, and the plurality of corona electrode pieces 305 are located on one side of the purification box 301 near the air inlet pipe 2010, a plurality of slots 306 evenly spaced front and rear are provided on a side of the purification box 301 away from the spray box 100, and adsorption plates 308 are inserted into the slots 306, and the adsorption plates 308 extend to the interior of the purification box 301, and a fixed cover plate 307 is fixedly mounted on a side of the plurality of adsorption plates 308 away from the spray box 100, and the fixed cover plate 307 is fastened to the surface of the purification box 301 by bolts;

[0046] Specifically, in this embodiment, when the hot air flow passes through the inside of the purification box 301, the dust and some detached zinc powder in the air flow first pass through a plurality of preheating components 300 distributed up and down. Since the preheating components 300 generate a high-voltage electric field, the air flow is ionized under the action of the high-voltage electric field to generate cations and anions. The dust particles and zinc powder adsorb the anions and carry negative charges. The negatively charged dust particles and zinc powder are adsorbed by a plurality of positively charged adsorption plates 308 as they flow to the left with the air flow, thereby treating the dust and zinc powder in the air flow. Intercept and filter, avoid it to enter the inside of preheating sleeve 303 together with airflow, at the same time, because the left end of cooling sleeve 201 gradually shrinks, and the pitch of spiral spoiler 206 gradually decreases to the left, that is, airflow gradually decreases along the channel of spiral spoiler 206 spiraling to the left, so the flow velocity of airflow gradually accelerates, and the dust and zinc powder partially attached to the surface of corona discharge electrode 305 can be blown off under the effect of faster flow velocity, so that the dust and zinc that enter the inside of purification box 301 later can be well contacted with corona discharge electrode 305 and charged.

[0047] Furthermore, the outer sleeve of the preheating sleeve 303 is provided with an insulation sleeve 304, which is made of ceramic material. A partition 101 is fixedly installed inside the spray box 100, and the partition 101 is located on the left side of the arc nozzle 500. The partition 101 is located on the right side of the insulation sleeve 304. A stop ring 102 is fixedly installed on the inner wall of the partition 101, and the inner size of the stop ring 102 is adapted to the outer wall size of the aluminum flat tube; the insulation sleeve 304 is provided to play a role of heat insulation and heat preservation, so as to avoid the rapid dissipation of heat entering the preheating sleeve 303, so as to ensure the preheating effect of the aluminum flat tube; the partition 101 and the stop ring 102 are provided to isolate the preheating sleeve 303 from the arc nozzle 500, so as to avoid contamination of the insulation sleeve 304 and the interior of the preheating sleeve 303 during zinc spraying.

[0048] Embodiment 3

[0049] A plurality of rollers 600 are rotatably mounted between the front wall and the rear wall of the spray box 100 and are distributed left and right. The height of the rollers 600 matches the height of the cooling jacket 201 and the height of the preheating jacket 303.

[0050] Specifically, in this embodiment, the rollers 600 are provided to support the bottom of the aluminum flat tube, so that the aluminum flat tube can move to the right well and prevent the aluminum flat tube from bending downward.

[0051] In this solution, the aluminum flat tube is inserted from the inlet at the left end of the spray box 100, and the aluminum flat tube passes through the interior of the preheating sleeve 303, then passes through the interior of the stop ring 102, and then passes through the interior of the baffle ring 2004, passes through the interior of the spiral spoiler 206, and finally passes out from the outlet at the right end of the cooling sleeve 201;

[0052] During processing, the aluminum flat tube is pulled by an external traction device to slowly move rightward at a uniform speed, and four arc nozzles 500 jointly perform arc zinc spraying operation on the surface of the aluminum flat tube. As the aluminum flat tube moves rightward, the aluminum flat tube section sprayed with zinc moves rightward to the inside of the cooling jacket 201, and then two fans 208 blow air, and the air is sent into the cooling jacket 201 through the air duct 209 and the opened air inlet 207, so that an airflow flowing to the left is generated inside the cooling jacket 201, and the airflow flows to the left in a spiral manner through the spiral spoiler 206, and the flowing cold airflow continuously absorbs the just-sprayed The surface temperature of the aluminum flat tube sprayed with zinc, on the one hand, causes the aluminum flat tube to cool down quickly, and on the other hand, after the cold air flow absorbs the temperature of the aluminum flat tube, the cold air flow rises steadily due to heat exchange and becomes hot air flow, and then flows through the guide cover 202 and the guide block 204, through the two air holes 205 and the two air inlet pipes 2010 to the inside of the purification box 301, and then flows through the air outlet pipe 302 to the inside of the preheating sleeve 303, and the hot air flows along the gap between the inner wall of the preheating sleeve 303 and the outer wall of the aluminum flat tube, thereby preheating the surface of the aluminum flat tube that has not been sprayed with zinc to avoid heat waste;

[0053] It should be noted that the left end of the cooling sleeve 201 gradually shrinks, and at the same time, the pitch of the spiral spoiler 206 gradually decreases to the left, that is, the airflow gradually decreases along the spiral left channel of the spiral spoiler 206, so the flow rate of the airflow gradually increases, so that the speed at which the hot air flow passes through the air inlet pipe 2010, the purification box 301 and the air outlet pipe 302 into the preheating sleeve 303 is accelerated, which can reduce the heat loss of the hot air flow during the flow transmission process and improve the preheating effect of the aluminum flat tube;

[0054] When the hot air flow passes through the process inside the purification box 301, first, the dust in the air flow and some of the zinc powder that falls off pass through a plurality of preheating components 300 distributed up and down, because the preheating component 300 generates a high-voltage electric field, the air flow is ionized under the action of the high-voltage electric field to generate cations and anions, and the dust particles and zinc powder adsorb anions and carry negative charges, and the dust particles and zinc powder with negative charges are adsorbed by a plurality of adsorption plates 308 with positive charges in the process of flowing to the left with the air flow, and the dust and zinc powder in the air flow are intercepted and filtered to prevent them from entering the interior of the preheating sleeve 303 together with the air flow, and at the same time, because the left end of the cooling sleeve 201 is gradually reduced, the pitch of the spiral spoiler 206 is gradually reduced to the left, that is, the air flow gradually reduces along the channel of the spiral spoiler 206 spiraling to the left, so the flow velocity of the air flow is gradually accelerated, and the dust and zinc powder partially attached to the surface of the corona electrode 305 can be blown off under the action of a faster flow velocity, so that the dust and zinc that subsequently enter the purification box 301 can be in good contact with the corona electrode 305 and are charged.

[0055] While the embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that many changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the invention.

Claims

1. A process for zinc spraying on the surface of a microchannel zinc-sprayed aluminum flat tube, comprising the following steps: S1: inserting the aluminum flat tube from the inlet at the left end of the spray box (100) of the zinc spraying device, and passing the aluminum flat tube through the interior of the preheating sleeve (303), then through the interior of the stop ring (102), and then through the interior of the baffle ring (2004), through the interior of the spiral spoiler (206), and finally out from the outlet at the right end of the cooling sleeve (201); S2: During processing, the aluminum flat tube is pulled by an external traction device to slowly move rightward at a uniform speed, and four arc nozzles (500) jointly perform arc zinc spraying operation on the surface of the aluminum flat tube. As the aluminum flat tube moves rightward, the aluminum flat tube section sprayed with zinc moves rightward to the inside of the cooling jacket (201), and then two fans (208) blow air, and the air is sent into the inside of the cooling jacket (201) through the air duct (209) and the opened air inlet (207), so that an airflow flowing to the left is generated inside the cooling jacket (201), and the airflow flows to the left in a spiral manner through the spiral spoiler (206), and the flowing cold airflow continuously absorbs the heat from the surface of the aluminum flat tube that has just been sprayed with zinc; S3: When the hot air flow passes through the inside of the purification box (301), the dust and some detached zinc powder in the air flow first pass through a plurality of preheating components (300) distributed up and down. Since the preheating components (300) generate a high-voltage electric field, the air flow is ionized under the action of the high-voltage electric field to generate cations and anions. The dust particles and zinc powder adsorb the anions and become negatively charged. The negatively charged dust particles and zinc powder are adsorbed by a plurality of positively charged adsorption plates (308) as they flow to the left with the air flow, thereby intercepting and filtering the dust and zinc powder in the air flow to prevent them from entering the inside of the preheating sleeve (303) along with the air flow. The zinc spraying device comprises a spray box (100), a cooling component (200) and a preheating component (300), characterized in that: the cooling component (200) is arranged at the right end inside the spray box (100), the preheating component (300) is arranged at the left end inside the spray box (100), and the preheating component (300) passes through the top and bottom of the spray box (100); The cooling component (200) comprises a cooling jacket (201) fixedly mounted on the right end of the interior of the spray box (100); a guide cover (202) is fixedly mounted on the left end of the cooling jacket (201); a standing plate (203) is fixedly mounted on the left end of the guide cover (202); the standing plate (203) is fixedly mounted on the inner wall of the spray box (100); a guide block (204) is fixedly mounted on the right side of the standing plate (203); A spiral spoiler (206) is fixedly installed inside, an air inlet (207) is opened at the right end of the top of the cooling jacket (201), an air duct (209) is fixedly installed on the top of the air inlet (207), a fan (208) is fixedly installed at the front and rear of the air duct (209), air holes (205) are opened at the top and bottom of the air guide cover (202), and an air inlet pipe (2010) is fixedly installed at the top and bottom of the air guide cover (202); The preheating component (300) includes two purification boxes (301) fixedly installed on the top of the spray box (100) and the other fixedly installed on the bottom of the spray box (100), the left end of each purification box (301) is fixedly installed with an air outlet pipe (302), and the adjacent ends of the two air outlet pipes (302) are jointly fixedly installed with a preheating sleeve (303), and the preheating sleeve (303) is located at the inner left end of the spray box (100).

2. The surface zinc spraying process of a microchannel zinc-sprayed aluminum flat tube according to claim 1 is characterized by: The inner wall size of the cooling jacket (201) gradually decreases toward the left, the size of the spiral spoiler (206) gradually decreases toward the left, and the pitch of the spiral spoiler (206) gradually decreases toward the left. The right end of the cooling jacket (201) is provided with a discharge port that is compatible with the specifications of the aluminum flat tube.

3. The surface zinc spraying process of a microchannel zinc-sprayed aluminum flat tube according to claim 2 is characterized in that: The inner wall size of the guide cover (202) gradually increases toward the left, and the outer wall size of the guide block (204) gradually increases toward the left. A baffle ring (2004) is fixedly installed on the inner wall of the guide block (204), and the inner wall specifications of the baffle ring (2004) are compatible with the outer wall specifications of the aluminum flat tube. A through hole is opened in the middle of the station plate (203), and the inner wall size of the through hole is larger than the inner wall size of the baffle ring (2004).

4. The surface zinc spraying process of a microchannel zinc-sprayed aluminum flat tube according to claim 3 is characterized by: The preheating component (300) further comprises a dust removal assembly, wherein the dust removal assembly comprises a plurality of corona electrode sheets (305) fixedly mounted inside the purification box (301), the plurality of corona electrode sheets (305) being distributed at equal intervals up and down, and the plurality of corona electrode sheets (305) being located on a side of the purification box (301) close to the air inlet pipe (2010), a plurality of slots (306) being distributed at equal intervals front and back on a side of the purification box (301) away from the spray box (100), the interiors of the slots (306) being plugged with adsorption plates (308), the adsorption plates (308) being extended to the interior of the purification box (301), a fixed cover plate (307) being fixedly mounted together on a side of the plurality of adsorption plates (308) away from the spray box (100), and the fixed cover plate (307) being fastened to the surface of the purification box (301) by bolts.

5. The surface zinc spraying process of a microchannel zinc-sprayed aluminum flat tube according to claim 4 is characterized in that: The outer shell of the preheating sleeve (303) is provided with a heat-insulating sleeve (304), and the heat-insulating sleeve (304) is made of ceramic material.

6. A process for zinc spraying on the surface of a microchannel zinc-sprayed aluminum flat tube according to claim 5, characterized in that: Four arc nozzles (500) are fixedly mounted on the outer wall of the spray box (100) by means of threads. The arc nozzles (500) are respectively located at the four corners of the spray box (100), and the four arc nozzles (500) all extend into the interior of the spray box (100). The four arc nozzles (500) are located on the left side of the station plate (203).

7. The surface zinc spraying process of a microchannel zinc sprayed aluminum flat tube according to claim 6 is characterized by: A partition (101) is fixedly installed inside the spray box (100), and the partition (101) is located on the left side of the arc nozzle (500). The partition (101) is located on the right side of the insulation sleeve (304). A sealing ring (102) is fixedly installed on the inner wall of the partition (101), and the inner size of the sealing ring (102) is compatible with the outer wall size of the aluminum flat tube.

8. The surface zinc spraying process of a microchannel zinc sprayed aluminum flat tube according to claim 7 is characterized by: The inner wall size of the preheating sleeve (303) is larger than the outer wall size of the aluminum flat tube, and the gap between the inner wall of the preheating sleeve (303) and the outer wall of the aluminum flat tube is 1.5 to 1.8 cm.

9. The surface zinc spraying process of a microchannel zinc-sprayed aluminum flat tube according to claim 8 is characterized by: A plurality of rollers (600) distributed left and right are rotatably mounted between the front wall and the rear wall of the spray box (100), and the height of the rollers (600) is matched with the height of the cooling jacket (201) and the height of the preheating jacket (303).

10. A process for zinc spraying on the surface of a microchannel zinc-sprayed aluminum flat tube according to claim 9, characterized in that: The cooling jacket (201), the air guide cover (202), the air inlet pipe (2010), the purification box (301) and the air outlet pipe (302) are all wrapped with a heat insulation layer on their peripheries.

Images