Powder coating device and coating process for double-sided spraying of coiled material

Abstract

The invention discloses a powder coating device and process for double-sided spraying of a coiled material. The powder coating device is sequentially provided with a transfer roller, a front electrostatic spraying device, a conveying roller, a back electrostatic spraying device, a sag meter, a coiled material curing device, a coiled material cooling device, a water cooling roller, a tensioner and a deviation rectifying roller in the coiled material conveying direction. Through alternate arrangement of the coiled material electrostatic spraying devices and directional conveying arrangement of the coiled material, the coiled material can be subjected to front and back electrostatic spraying at the same time, one-time curing is carried out after alternate spraying, the coiled material is conveyed and sprayed in a one-way mode in the spraying process and does not need to be folded back for spraying, the double-face and double-color spraying requirement of the coiled material is met, production waste is reduced, and the production cost is reduced. According to the double-face spraying powder coating device for the coiled material, the production efficiency is improved, meanwhile, the traditional double-face spraying double-face coating and double-face drying coating process of the coiled material is broken, the double-face spraying double-face coating and one-face drying coating process of the coiled material is achieved, the double-face spraying coating process of the coiled material is optimized, and the total investment and energy consumption of the double-face spraying powder coating device for the coiled material are reduced.

Description

Technical Field

[0001] The present invention belongs to the technical field of coil material spraying production, and more specifically relates to the technical field of coil material double-sided spraying production, in particular to a powder coating device and coating process for coil material double-sided spraying. Background Art

[0002] Coil spraying is based on metal coils (cold-rolled sheets, hot-dip galvanized sheets, aluminum-plated sheets, high-aluminum alloy sheets, stainless steel sheets, etc.). The coating is evenly sprayed on one or both sides of the flat plate strip after unrolling on a high-speed continuous coating production line, and then quickly baked and cured. After cooling and rewinding, the coil spraying is completed. The electrostatic powder spraying process is increasingly used in the continuous production of metal coils. Powder coating has the advantages of environmental protection, high efficiency, energy saving, and high quality. It has always been a coating method actively promoted and advocated. All walks of life are actively promoting the work of "oil to powder". For decades, the research and development of coil coating using powder coating has been ongoing. At present, except for a few slow lines that use powder spraying technology, most coil coatings are still coated with liquid coatings. In the prior art, most coil production lines basically add powder coating equipment to the original liquid coating line to meet the needs of single-sided powder spraying. However, for double-sided powder spraying of coils, it is necessary to spray, dry and cool one side and then turn back to spray and dry the other side, that is, "two coatings and two bakings". The powder spraying and curing devices require two inlets and two outlets, which greatly reduces the production efficiency. At the same time, if different colors of powder coatings are sprayed on both sides, the powder coatings need to be replaced, and there are problems such as color change and color mixing. In addition, the sprayed surface is easily worn during the double-sided spraying process of the coil, which is easy to cause defective products.

[0003] Based on the above problems and defects of double-sided spraying of coil materials, the patent of this invention develops and improves the powder coating process and powder coating equipment for double-sided spraying of coil materials. On the basis of realizing the replacement of paint coating with powder coating of coil materials, a one-way conveying coating line for double-sided spraying of coil materials is realized, without the need for return spraying, avoiding two in and two out of the curing device, realizing "two coatings and one baking", improving the production efficiency of double-sided spraying of coil materials, avoiding conveying wear of the spraying surface, and color change and cross-color when changing powder coatings. Double-sided spraying is cured at the same time, and the double-sided spray coating is cured uniformly, thereby improving the effect of double-sided spraying of coil materials. Summary of the invention

[0004] In order to solve the above production problems, one of the purposes of the present invention is to provide a powder coating device and coating process for double-sided spraying of coiled materials, which can be used for powder coating production of double-sided spraying of coiled materials.

[0005] The invention discloses a powder coating device for double-sided spraying of coiled materials, wherein a transfer roller, a front electrostatic spraying device, a conveying roller, a back electrostatic spraying device, a sag meter, a coiled material curing device, a coiled material cooling device, a water-cooling roller, a tension machine, and a deviation correction roller are sequentially arranged along the conveying direction of the coiled materials; The front electrostatic spraying device and the back electrostatic spraying device respectively spray the front and back of the coil alternately, the transfer roller is arranged directly above the front electrostatic spraying device, so that the front side of the coil is facing upward in the conveying direction of the coil, and the front side is sprayed when it is conveyed to the front electrostatic spraying device, and the conveying roller is arranged obliquely below the front electrostatic spraying device, so that the front side of the coil is facing downward in the horizontal conveying direction of the coil, and the back side is sprayed when it is conveyed to the back electrostatic spraying device; The coil curing device is provided with a coil curing channel, and infrared radiation heating plates are provided above and below the coil curing channel to respectively cure the front and back sides of the coil. A sag meter is provided between the back electrostatic spraying device and the coil curing device to monitor the sag of the coil in the back electrostatic spraying device and the coil curing channel. The monitored sag data is fed back to the tension machine after the water-cooling roller. The tension machine uses tension to adjust the sag of the coil so that the coil is kept horizontal when sprayed by the back electrostatic spraying device, and the coil is placed in the best curing position of the coil curing channel during curing, so that the front and back sides of the coil are sprayed evenly and cured completely. The coil cooling device is provided with an air cooling device and a water cooling roller. The air cooling device is arranged after the coil curing device. The coil is provided with a water cooling roller at the outlet of the air cooling device to further cool the temperature of both sides of the coil. A tension machine and a deviation correction roller are arranged after the water cooling roller to adjust the coil conveying line speed and prevent the coil from deviating during the conveying process.

[0006] The powder coating device for double-sided spraying of coiled materials as described above, wherein the front electrostatic spraying device includes a front sprayer and a front spray room, and the back electrostatic spraying device includes a back sprayer and a back spray room, the front spray room is vertically arranged, and the coiled material input port of the front spray room is respectively arranged at the top and the bottom, the front sprayer is arranged on the side opposite to the front spray room, and is arranged for left and right reciprocating horizontal spraying in the width direction of the front side of the coiled material, the coiled material input port and output port of the back spray room are respectively arranged at the front side and the back side, and the back sprayer is installed on the top of the back spray room, and is arranged for front and back reciprocating downward spraying in the width direction of the back side of the coiled material.

[0007] The powder coating device for double-sided spraying of coiled materials as described above, wherein the coiled material curing device channel is provided with an infrared radiation heating plate, and the coiled material curing device channel is symmetrically provided with infrared radiation heating plates above and below, and the distance between the coiled material and the upper and lower infrared radiation heating plates is monitored by the sag meter to be ≥20mm.

[0008] As described above, in the powder coating device for double-sided spraying of coiled materials, the air cooling device is a device for symmetrically arranging air cooling outlets in the upper and lower parts, and different control valves are arranged at the upper and lower air cooling outlets, so that air can be blown to cool the front or back of the coiled material separately, or both the front and back of the coiled material can be blown to cool simultaneously.

[0009] In the powder coating device for double-sided spraying of coiled materials as described above, the water-cooled roller comprises a water-cooled roller 1 and a water-cooled roller 2, which are symmetrically arranged up and down to cool the coating on the front and back sides of the coiled materials respectively.

[0010] In the powder coating device for double-sided spraying of coiled materials as described above, the deviation-correcting roller is a double-roller deviation-correcting arrangement, comprising a first deviation-correcting roller, a second deviation-correcting roller, a base, a power mechanism and a limiting mechanism.

[0011] The powder coating device for double-sided spraying of coiled materials as described above, wherein the layout of the powder coating device is divided into an upper layer and a ground layer, which is arranged according to the direction of the coiled materials, the upper layer is provided with a transfer roller for transferring the coiled materials, the back side of the coiled materials contacts the transfer roller and is transported to the front electrostatic spraying device, the front electrostatic spraying device is vertically arranged on the ground layer, the coiled materials enter the front spraying room from the top input port of the front spraying room, and are output from the bottom output port of the front spraying room after spraying on the front side, two conveying rollers are arranged at the bottom output port of the front spraying room, the back side of the coiled materials after spraying on the front side contacts the conveying roller and horizontally transports the coiled materials to the back electrostatic spraying device, the back electrostatic spraying device is horizontally arranged on the ground layer, the front side of the coiled materials enters the back spraying room from the left side input port of the back spraying room with the front side facing downward, at this time, the back side sprayer sprays forward and backward along the width direction of the coiled materials, the coiled materials after spraying on the back side are horizontally transported to the right side output port of the back spraying room, and a sag meter, a coil curing device, a coil cooling device, a tension machine, and a deviation correction roller are arranged on the ground layer along the horizontal conveying direction of the coiled materials.

[0012] In the powder coating device for double-sided spraying of coiled materials as described above, the powder coating sprayed by the sprayer of the front electrostatic spraying device and the powder coating sprayed by the sprayer of the back electrostatic spraying device can be one or two at the same time.

[0013] The coating process of double-sided spraying of coil material, wherein the coating process of double-sided spraying of coil material adopts the powder coating device of double-sided spraying of coil material, and the coating process of double-sided spraying of coil material comprises the following steps: during the production of double-sided spraying of coil material, the coil material is wound in from above the transfer roller of the upper layer, the front side of the coil material is transferred from the upper layer to the front electrostatic spraying device of the ground layer along the coil material conveying direction with the front side facing upward, the coil material is conveyed from the top input port of the front spraying room to the front spraying room, at this time, the front sprayer reciprocates left and right along the width direction of the coil material to spray the front side of the coil material horizontally, the sprayed coil material is conveyed from the bottom output port of the front spraying room to the horizontally arranged conveying roller, the coil material is horizontally conveyed around the bottom of the conveying roller to the horizontally arranged back electrostatic spraying device, and the back side of the coil material It is contacted with the conveying roller and conveyed horizontally to the left input port of the back spraying room. At this time, the back sprayer reciprocates forward and backward along the width direction of the coil to spray the back of the coil. The sprayed coil is horizontally output from the right output port of the back spraying room. The output coil is monitored by the sag meter and the data of the coil sag is fed back to the tension machine. The tension machine adjusts the linear speed and tensioning degree of the coil according to the sag data of the coil to ensure the horizontal transportation of the coil in the back spraying device and the coil curing channel. When the coil deviates, the correction roller behind the tension machine corrects the deviation of the coil in time. The coil is transported unidirectionally along the conveying direction in the coil curing channel, and the front and double sides of the coil are cured at the same time. The cured double-sided sprayed coil is cooled by the air cooling device and the water cooling roller in turn to obtain the double-sided sprayed coil product.

[0014] The coating process of double-sided spraying of coiled materials, wherein the line speed of the double-sided spraying powder coating device of the coiled materials is 10-80 m / min, the temperature of the coiled material curing device is 220-280° C., and the surface temperature of the coiled material after cooling is 20-35° C.

[0015] The advantages of the present invention are: (1) The present invention enables the front and back sides of the coil to be electrostatically sprayed at the same time by means of the alternating arrangement of the coil electrostatic spraying device and the directional conveying arrangement of the coil, and after the alternating spraying, the coil only needs to be cured once. During the spraying process, the coil is transported and sprayed in one direction without the need for return spraying, thus meeting the requirements for double-sided and double-color spraying of the coil, avoiding the wear of the spraying surface during the return spraying process, reducing the generation of production waste, and improving production efficiency; (2) The traditional "two coatings and two bakings" coating process for double-sided spray coating of coil materials is broken, and the "two coatings and one baking" coating process for double-sided spray coating of coil materials is realized, which optimizes the double-sided spray coating process of coil materials and reduces the overall investment and energy consumption of double-sided spray powder coating equipment of coil materials. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a schematic diagram of a powder coating device for double-sided spraying of a coiled material according to the present invention.

[0017] Figure 2 It is a schematic diagram of the structure of the deviation correction roller of the present invention.

[0018] Explanation of the reference numerals: 1. Transfer roller, 2. Front electrostatic spraying device, 3. Conveyor roller, 4. Back electrostatic spraying device, 5. Sag meter, 6. Coil curing device, 7. Coil cooling device, 8. Tension machine, 9. Correction roller.

[0019] 201. front sprayer, 202. front spray room, 401. back sprayer, 402. back spray room, 601. coil curing channel, 602. infrared radiation heating plate, 701. air cooling device, 702. water cooling roller, 901. first deviation correcting roller, 902. second deviation correcting roller, 903. base, 904. limiting mechanism, 905. power mechanism.

[0020] 7011. Control valve, 7012. Air cooling box, 7021. Water cooling roller one, 7022. Water cooling roller two. DETAILED DESCRIPTION

[0021] The powder coating device for double-sided spraying of coiled materials of the present invention will be further described below in conjunction with the accompanying drawings.

[0022] It should be understood that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the invention. In addition, the terms "first", "second", etc. are only used for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, features defined as "first", "second", etc. may explicitly or implicitly include one or more of the features. In the description of the invention, unless otherwise specified, "multiple" means two or more.

[0023] To realize the production of the powder coating device for double-sided spraying of coil materials according to the present invention, see Figure 1 to Figure 2 .

[0024] like Figure 1 As shown, a transfer roller 1, a front electrostatic spraying device 2, a conveying roller 3, a back electrostatic spraying device 4, a sag meter 5, a coil curing device 6, a coil cooling device 7, a water-cooled roller 702, a tension machine 8, and a correction roller 9 are sequentially arranged along the coil conveying direction.

[0025] The coil passes through the front electrostatic spraying device 2 and the back electrostatic spraying device 4 in sequence during transportation. The front electrostatic spraying device 2 and the back electrostatic spraying device 4 spray the front and back of the coil alternately, respectively. The two sides of the coil will not affect each other during spraying. The transfer roller 1 is arranged directly above the front electrostatic spraying device 2, and the front side of the coil is facing upward in the direction of coil transportation, so as to ensure that the back side of the coil can be supported and transported to prevent deformation of the coil during transportation. When transported to the front electrostatic spraying device 2, the front side of the coil is ensured to face the front sprayer 201. The conveying roller 1 is arranged at an angle below the front electrostatic spraying device 2, so that the coil is transported horizontally from an angle below, and the front side of the coil faces downward along the horizontal conveying direction, with the back side in contact with the conveying roller 3 for horizontal support and conveying, to prevent the coil from bending under the action of gravity, and to prevent the sprayed front side from being bumped and scratched during transportation, which would affect the front spraying effect. When conveying to the back electrostatic spraying device 4, the back side is sprayed, and the coil is conveyed horizontally with the back side facing upward, to ensure that the back sprayer 401 of the back electrostatic spraying device 4 sprays perpendicularly to the coil.

[0026] Furthermore, the coil curing device 6 is provided with a coil curing channel 601, and infrared radiation heating plates 602 are provided above and below the coil curing channel 601. The coil curing device channel 601 is symmetrically provided with infrared radiation heating plates 602 above and below, and the front and back sides of the coil are cured respectively. A sag meter 5 is provided between the back electrostatic spraying device 4 and the coil curing device 6 to monitor the sag of the coil in the back electrostatic spraying device 4 and the coil curing channel 601. The sag meter 5 monitors the distance between the coil and the upper and lower infrared radiation heating plates 602 to be ≥20mm. The monitored sag data is fed back to the tension machine 8 after the water-cooled roller 702. The tension machine 8 uses tension to adjust the sag of the coil so that the coil remains horizontal when sprayed by the back electrostatic spraying device 4, and the coil is in the best curing position of the coil curing channel 601 during curing, so that the front and back sides of the coil are sprayed evenly and cured completely.

[0027] Furthermore, the coil cooling device 7 is provided with an air cooling device 701 and a water cooling roller 702. The air cooling device 701 is provided after the coil curing device 6. The air cooling device 701 is provided with air cooling outlets symmetrically arranged in the upper and lower parts. Different control valves 7011 are provided in the upper and lower air cooling outlets. The front or back of the coil can be cooled by blowing air alone, or the front and back of the coil can be cooled by blowing air at the same time. The outlet of the air cooling device 701 of the coil is provided with a water cooling roller 702 to further cool the temperature of both sides of the coil. The water-cooled roller 702 comprises a water-cooled roller 1 7021 and a water-cooled roller 2 7022, which are symmetrically arranged up and down to cool the coating on the front and back of the coil respectively. The water-cooled roller 1 7021 contacts the front of the coil to cool the front of the coil, and the water-cooled roller 2 7022 contacts the back of the coil to cool the back of the coil. A tension machine 8 and a deviation correction roller 9 are arranged behind the water-cooled roller 702 to adjust the conveying line speed of the coil and prevent the coil from deviating during the conveying process.

[0028] like Figure 1 and Figure 2 As shown, the deflection correction roller 9 is a double-roller deflection correction setting, including a first deflection correction roller 901, a second deflection correction roller 902, a base 903, a power mechanism 905 and a limiting mechanism 904. The base 903 is horizontally set up and installed on a fixed bracket, and the deflection correction roller 901 is horizontally and parallelly mounted above the base 903. The base 903 is connected to the deflection correction roller 9 through a frame. The first deflection correction roller 901 is horizontally mounted on the left end of the frame, and the second deflection correction roller 902 is horizontally set at the right end of the frame. The first deflection correction roller 901 and the second deflection correction roller 902 are staggered in the vertical direction. The base 903 is provided with a support column at a middle position of the first deflection correction roller 901 and the second deflection correction roller 902, and a limiting mechanism 904 is provided on the support column. The power mechanism 905 is respectively arranged at the left and right ends above the base 903, and is used to push the deflection correction roller 9 frame to move inward or outward along the limiting mechanism 904. Specific operating principle: the coil is wound in from the upper side of the first deflection correction roller 901, passes through the lower side of the second deflection correction roller 902, and is wound out from the lower side of the second deflection correction roller 902. When the coil at the front or rear end of the double-roller deflection correction device is offset, the power mechanism 905 pushes the deflection correction roller 9 frame to move inward or outward along the limiting mechanism 904, so that the offset coil is corrected. Specifically, when the deflection correction roller frame moves outward along the limiting mechanism 904, it can be used to correct the coil that is offset outward at the front end of the double-roller deflection correction device or the coil that is offset inward at the rear end of the double-roller deflection correction device; when the deflection correction roller frame 9 moves inward along the limiting mechanism 904, it can be used to correct the coil that is offset inward at the front end of the double-roller deflection correction device or the coil that is offset outward at the rear end of the double-roller deflection correction device.

[0029] The front electrostatic spraying device 2 includes a front sprayer 201 and a front spray room 202, and the back electrostatic spraying device 4 includes a back sprayer 401 and a back spray room 402. The front spray room 202 is vertically arranged, and the coil input port of the front spray room 202 is respectively arranged at the top and the bottom. The front sprayer 201 is arranged on the side opposite to the front spray room 202, and is arranged for reciprocating horizontal spraying in the width direction of the front of the coil. The coil input port and output port of the back spray room 402 are respectively arranged at the front side and the back side, and the back sprayer 401 is installed on the top of the back spray room 402, and is arranged for reciprocating front and back spraying in the width direction of the back of the coil. The powder coating sprayed by the sprayer of the front electrostatic spraying device 2 and the powder coating sprayed by the sprayer of the back electrostatic spraying device 4 can be one or two at the same time.

[0030] From the distribution of powder coating devices, the layout of the powder coating device is divided into an upper layer and a ground layer, which are arranged according to the direction of the coil. The upper layer is provided with a transfer roller 1 for transferring the coil. The back of the coil contacts the transfer roller 1 and is transported to the front electrostatic spraying device 2. The front electrostatic spraying device 2 is vertically arranged on the ground layer. The coil enters the front spray room 202 from the top input port of the front spray room 202. At this time, the front sprayer 201 sprays the front of the coil horizontally from left to right. After the front of the coil is sprayed, it is output from the bottom output port of the front spray room 202. The bottom output port of the front spray room 202 is provided with two The conveying roller 3, the back side of the coil after front spraying contacts the conveying roller 3 and conveys the coil horizontally to the back electrostatic spraying device 4, the back electrostatic spraying device 4 is horizontally arranged on the ground layer, the front side of the coil enters the back spraying room 402 from the left input port of the back spraying room 402 with the front side facing down, at this time, the back sprayer 401 sprays forward and backward along the width direction of the coil, the coil after back spraying is horizontally conveyed to the right output port of the back spraying room 402 for output, and the sag meter 5, coil curing device 6, coil cooling device 7, tension machine 8, and correction roller 9 are arranged on the ground layer along the horizontal conveying direction of the coil.

[0031] A coating process for double-sided spraying of coiled materials is introduced below, wherein the coating process for double-sided spraying of coiled materials adopts the powder coating device for double-sided spraying of coiled materials, and the coating process for double-sided spraying of coiled materials includes the following steps: During the double-sided spraying production of coiled materials, the coiled materials are wound in from above the transfer roller 1 of the upper layer, the line speed of the double-sided spraying powder coating device of the coiled materials is 10-80m / min, and the line speed of the double-sided spraying powder coating device of the coiled materials is preferably 30-60m / min, the front side of the coiled materials is transported from the upper layer to the front electrostatic spraying device 2 of the ground layer along the coil conveying direction with the front side facing upward, the coiled materials are transported to the front spraying room 202 from the top input port of the front spraying room 202, at this time, the front sprayer 201 reciprocates left and right along the width direction of the coiled materials to spray the front side of the coiled materials horizontally, the sprayed coiled materials are transported from the bottom output port of the front spraying room 202 to the horizontally arranged conveying roller 3, the coiled materials are horizontally transported around the bottom of the conveying roller 3 to the horizontally arranged back electrostatic spraying device 4, the back side of the coiled materials contacts the conveying roller 3 and is horizontally transported to the left side input port of the back spraying room 402, at this time, the back side sprayer 401 reciprocates back and forth along the width direction of the coiled materials to spray the back side of the coiled materials, when the same color is sprayed on both sides of the coiled materials, the front electrostatic spraying device 2 and the back electrostatic spraying device 4 can be a powder coating at the same time. When different colors are sprayed on both sides of the coil, the front electrostatic spraying device 2 and the back electrostatic spraying device 4 can be two different powder coatings. The coil after spraying is horizontally output from the right output port of the back spray room 402. The output coil is monitored by the sag meter 5 and the sag data is fed back to the tension machine 8. The tension machine 8 adjusts the coil line speed and tension degree according to the sag data of the coil to ensure the horizontal transportation of the coil in the back spraying device 4 and the coil curing channel 601. When the coil is deviated, the correction roller 9 after the tension machine 8 corrects the deviation of the coil in time, and the coil is transported unidirectionally along the conveying direction in the coil curing channel 601, and the front and both sides of the coil are cured at the same time. The temperature of the coil curing device 6 is 220~280℃, preferably 240~270℃. The cured double-sided sprayed coil is cooled by the air cooling device 701 and the water cooling roller 702 in turn, and the surface temperature of the coil is cooled to 20~35℃ to obtain a double-sided sprayed coil product. However, when the coil is subjected to single-sided spraying production, the powder coating device can also meet the needs of single-sided spraying on the front or back of the coil. When the coil is subjected to single-sided spraying on the front or back, one of the back electrostatic spraying device 4 or the front electrostatic spraying device 2 is used as a conveying channel to convey the coil. The coil curing device 6 closes the infrared radiation heating plate 602 at the bottom or top of the coil curing channel 601, and at the same time closes the air cooling box 7012 control valve 7011 and water-cooled roller 2 7022 or water-cooled roller 1 7021 at the bottom or top of the coil cooling device, and opens the infrared radiation heating plate 602 at the top or bottom of the coil curing channel 601. It only needs to meet the needs of single-sided coating curing on the front or back of the coil, thereby avoiding heat loss and waste of the other part of the infrared radiation heating plate 602, and avoiding loss and waste of cooling energy of the air cooling box 7012 and the water-cooled roller 702.

[0032] The double-sided powder coating device and coating process of the present invention enable the coil to be electrostatically sprayed on the front and back sides at the same time through the alternating arrangement of the coil electrostatic spray device and the directional conveying arrangement of the coil, and only one curing is required after the alternating spraying. During the spraying process, the coil is transported and sprayed in one direction without the need for return spraying, thereby meeting the requirements for double-sided and two-color spraying of the coil, reducing the generation of production waste, and improving production efficiency. At the same time, it breaks the traditional "two coatings and two baking" coating process for double-sided spraying of the coil, and realizes the "two coatings and one baking" coating process for double-sided spraying of the coil, thereby optimizing the double-sided spraying coating process for the coil, and reducing the overall investment and energy consumption of the double-sided spraying powder coating device for the coil.

[0033] It should be understood that the purpose of these embodiments is only to illustrate the present invention and is not intended to limit the protection scope of the present invention. In addition, it should also be understood that after reading the technical content of the present invention, those skilled in the art can make various changes, modifications and / or variations to the present invention, and all of these equivalent forms also fall within the protection scope defined by the appended claims of this application.

Claims

1. A powder coating device for double-sided spraying of coiled materials, characterized in that: Along the conveying direction of the coil, a transfer roller, a front electrostatic spraying device, a conveying roller, a back electrostatic spraying device, a sag meter, a coil curing device, a coil cooling device, a water-cooling roller, a tension machine, and a deviation correction roller are sequentially arranged; The front electrostatic spraying device and the back electrostatic spraying device respectively spray the front and back of the coil alternately, the transfer roller is arranged directly above the front electrostatic spraying device, so that the front side of the coil is facing upward in the conveying direction of the coil, and the front side is sprayed when it is conveyed to the front electrostatic spraying device, and the conveying roller is arranged obliquely below the front electrostatic spraying device, so that the front side of the coil is facing downward in the horizontal conveying direction of the coil, and the back side is sprayed when it is conveyed to the back electrostatic spraying device; The coil curing device is provided with a coil curing channel, and infrared radiation heating plates are provided above and below the coil curing channel to respectively cure the front and back sides of the coil. A sag meter is provided between the back electrostatic spraying device and the coil curing device to monitor the sag of the coil in the back electrostatic spraying device and the coil curing channel. The monitored sag data is fed back to the tension machine after the water-cooling roller. The tension machine uses tension to adjust the sag of the coil so that the coil is kept horizontal when sprayed by the back electrostatic spraying device, and the coil is placed in the best curing position of the coil curing channel during curing, so that the front and back sides of the coil are sprayed evenly and cured completely. The coil cooling device is provided with an air cooling device and a water cooling roller. The air cooling device is arranged after the coil curing device. The coil is provided with a water cooling roller at the outlet of the air cooling device to further cool the temperature of both sides of the coil. A tension machine and a deviation correction roller are arranged after the water cooling roller to adjust the coil conveying line speed and prevent the coil from deviating during the conveying process.

2. The powder coating device for double-sided spraying of coiled materials as claimed in claim 1, characterized in that: The front electrostatic spraying device includes a front sprayer and a front spray room, and the back electrostatic spraying device includes a back sprayer and a back spray room. The front spray room is vertically arranged, and the coil material input port of the front spray room is respectively arranged at the top and the bottom. The front sprayer is arranged on the side opposite to the front spray room, and is arranged for left and right reciprocating horizontal spraying in the width direction of the front side of the coil material. The coil material input port and output port of the back spray room are respectively arranged at the front side and the back side. The back sprayer is installed on the top of the back spray room, and is arranged for front and back reciprocating downward spraying in the width direction of the back side of the coil material.

3. The powder coating device for double-sided spraying of coiled materials as claimed in claim 1, characterized in that: The coil curing device channel is provided with infrared radiation heating plates, and infrared radiation heating plates are symmetrically arranged on the upper and lower sides of the coil curing device channel. The distance between the coil and the upper and lower infrared radiation heating plates is monitored by the sag meter to be ≥20mm.

4. The powder coating device for double-sided spraying of coiled materials as claimed in claim 1, characterized in that: The air cooling device has air cooling outlets symmetrically arranged up and down, and different control valves are arranged at the upper and lower air cooling outlets, so that air can be blown to cool the front side or the back side of the coil separately, or both the front side and the back side of the coil can be blown to cool simultaneously.

5. The powder coating device for double-sided spraying of coiled materials as claimed in claim 1, characterized in that: The water-cooling rollers include a first water-cooling roller and a second water-cooling roller, which are symmetrically arranged up and down to cool the coatings on the front and back sides of the coil respectively.

6. The powder coating device for double-sided spraying of coiled materials as claimed in claim 1, characterized in that: The deviation-correcting roller is a double-roller deviation-correcting arrangement, comprising a first deviation-correcting roller, a second deviation-correcting roller, a base, a power mechanism and a limiting mechanism.

7. The powder coating device for double-sided spraying of coiled materials as claimed in claim 1, characterized in that: The layout of the powder coating device is divided into an upper layer and a ground layer, which is arranged according to the direction of the coil. The upper layer is provided with a transfer roller for transferring the coil. The back side of the coil contacts the transfer roller and is transported to the front electrostatic spraying device. The front electrostatic spraying device is vertically arranged on the ground layer. The coil enters the front spray room from the top input port of the front spray room. After the front side of the coil is sprayed, it is output from the bottom output port of the front spray room. Two conveying rollers are arranged at the bottom output port of the front spray room. The back side of the coil after front spraying contacts the conveying roller and horizontally transports the coil to the back electrostatic spraying device. The back electrostatic spraying device is horizontally arranged on the ground layer. The front side of the coil enters the back spray room from the left input port of the back spray room with the front side facing down. At this time, the back sprayer sprays forward and backward along the width direction of the coil. The coil after back spraying is horizontally transported to the right output port of the back spray room. A sag meter, a coil curing device, a coil cooling device, a tension machine and a deviation correction roller are arranged on the ground layer along the horizontal conveying direction of the coil.

8. The powder coating device for double-sided spraying of coiled materials as claimed in claim 1, characterized in that: The powder coating sprayed by the sprayer of the front electrostatic spraying device and the powder coating sprayed by the sprayer of the back electrostatic spraying device can be one or two at the same time.

9. A coating process for double-sided spraying of coiled materials, characterized in that: The coating process of double-sided spraying of coil material adopts the powder coating device of double-sided spraying of coil material described in claim 1, and the coating process of double-sided spraying of coil material comprises the following steps: during the production of double-sided spraying of coil material, the coil material is wound in from above the transfer roller of the upper layer, and the front side of the coil material is transferred from the upper layer to the front electrostatic spraying device of the ground layer along the coil material conveying direction with the front side facing upward, and the coil material is conveyed from the top input port of the front spray room to the front spray room, at this time, the front sprayer reciprocates left and right along the width direction of the coil material to spray the front side of the coil material horizontally, and the sprayed coil material is conveyed from the bottom output port of the front spray room to the horizontally arranged conveying roller, and the coil material is horizontally conveyed around the bottom of the conveying roller to the horizontally arranged back electrostatic spraying device, and the back side of the coil material contacts the conveying roller with water The coil is transported horizontally to the left input port of the back spray room. At this time, the back sprayer sprays the back of the coil back and forth along the width direction of the coil. The sprayed coil is output horizontally from the right output port of the back spray room. The output coil is monitored by the sag meter for the sag data of the coil and fed back to the tension machine. The tension machine adjusts the linear speed and tensioning degree of the coil according to the sag data of the coil to ensure the horizontal transportation of the coil in the back spray device and the coil curing channel. When the coil deviates, the correction roller behind the tension machine corrects the deviation of the coil in time. The coil is transported unidirectionally along the conveying direction in the coil curing channel, and the front and double sides of the coil are cured at the same time. The cured double-sided sprayed coil is cooled by the air cooling device and the water cooling roller in turn to obtain a double-sided sprayed coil product.

10. The double-sided spray coating process of coiled material according to claim 9, characterized in that: The line speed of the coil double-sided spray powder coating device is 10-80 m / min, the temperature of the coil curing device is 220-280° C., and the surface temperature of the coil after cooling is 20-35° C.

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