Production line for double-sided color coating of pre-coated metal coiled material and production method thereof

Abstract

The invention discloses a production line for double-sided color coating of a pre-coated metal coiled material and a production method of the production line, the production line comprises two uncoiling rollers and a pinch roller for clamping and conveying the coiled material at the coiled material output ends of the two uncoiling rollers, and the output of the pinch roller is provided with a double-layer composite shear for cutting the conveyed coiled material into the required size and shape. The coiled material is conveyed through the supporting conveying roller in the sewing conveying process, the tensioning air cylinder pushes the adjusting tensioning roller to move downwards to be tensioned when the coiled material is loosened, the adjusting tensioning roller moves downwards to press the coiled material into the supporting limiting roller in the process of tensioning the coiled material, the coiled material is positioned through the positioning disc, and the coiled material is always kept at the initial conveying position; and meanwhile, the tensioning roller is adjusted to move upwards to support the limiting roller to move upwards under the assistance of a movable plate piece, a reset elastic piece and a guide rod, the coiled material can be located at the same position all the time in the tension adjustment process, and the phenomenon of conveying wrinkles caused by position deviation and coiled material looseness is avoided.

Description

Technical Field

[0001] The invention belongs to the technical field of coil production lines, and in particular relates to a production line for double-sided color coating of pre-coated metal coils and a production method thereof. Background Art

[0002] It is a commonly used technology in this field to set a sandwich between two layers of metal sheets, such as honeycomb panels and polymer layers, in order to improve their fire resistance, hardness and strength. During the processing, the length of a roll of metal coil, such as aluminum coil, is limited, and the problem of changing coils is inevitable. The existing equipment for solving the problem of maintaining continuous production difficulties during roll changing is mainly a coil storage rack, which ensures continuous production by pre-storing the coils and then releasing them when changing the coils. However, the equipment has the defects of being large in size and not conducive to precise alignment and stitching.

[0003] To this end, a metal coil online stitching mechanism with the announcement number "CN207170742U" includes a chain track and a base moving on the chain track, the base is provided with a stitching unit and a roller unit arranged at the exit of the stitching unit, the roller unit includes a lower support roller and an upper pressure roller arranged up and down, the base is also provided with a first cylinder for driving the upper pressure roller to move up and down, the entrance of the stitching unit is provided with a feed support roller for supporting the metal coil; the base is also connected to a driving unit for driving the base to move along the chain track. It has the advantages of small equipment footprint and the ability to quickly stitch metal coils.

[0004] However, for the above-mentioned online stitching mechanism for metal coils, although the feed rack is provided with a correction roller and a centering optical sensor for detecting the position of the metal coil conveyed on the correction roller to realize the correction and winding of the stitched coils, there are still the following obvious defects during use: However, in the process of outputting the stitched coils, since there is no structural member for tensioning and limiting the coils during transportation, the coils are prone to loss of tightness and deviation in position during transportation, resulting in wrinkles in the coils due to the slackness of the coils during transportation. Summary of the invention

[0005] The object of the present invention is to provide a production line and a production method for double-sided color coating of pre-coated metal coils, so as to solve the problems raised in the above-mentioned background technology.

[0006] To achieve the above-mentioned purpose, the present invention provides the following technical solutions: a production line for double-sided color coating of pre-coated metal coils, comprising two unwinding rollers, and a pinch roller for clamping and conveying the coil at the coil output end of the two unwinding rollers, and a double-layer composite shear for cutting the conveyed coil into a required size and shape is provided at the output end of the pinch roller, a sewing machine for sewing the double-layer coil is provided at the output end of the double-layer composite shear, a tensioning roller frame for adjusting the tension of the coil after sewing to prevent deviation and wrinkles is provided at the output end of the sewing machine, a coil entrance looper for continuing the coil transmission is provided at the output end of the tensioning roller frame, a correction roller for conveying and correcting the coil is provided at the output end of the coil entrance looper, a coil washing box for cleaning impurities and dust on the surface of the coil is provided at the coil output end of the correction roller, a hot air dryer for hot air drying the cleaned coil is provided at the coil delivery end of the coil washing box, and a double-head roller coating box for uniformly rolling the coating on the surface of the coil is provided at the coil output end of the hot air dryer.

[0007] Preferably, the coil output end of the double-headed roller coating box is provided with a coil conveying and curing box for curing the coating on the surface of the coil, and the output end of the coil conveying and curing box is provided with a water cooling box for water cooling the coil after curing, and the output end of the water cooling box is provided with a hot air dryer for drying the coil after cooling, so that the coil is subjected to high-temperature curing and air drying treatment after roller coating.

[0008] Preferably, the output end of the hot air dryer is provided with a coating box for coating the surface of the coil, the coil output end of the coating box is provided with a coil outlet looper for compactly winding the coil, the output end of the coil outlet looper is provided with a clamping hydraulic shear, and the output end of the clamping hydraulic shear is provided with a coil winding rack, so as to cover the coil with a layer of lining paper for surface protection and facilitate conveying and tensioning for winding.

[0009] Preferably, lifting cylinders are provided on both sides of the ends of the coil winding rack through support plates, and positioning pressure blocks are fixed to the ends of the lifting cylinders. A winding roller for winding the coil is placed on the coil winding rack to achieve winding of the coil roller after coating and processing.

[0010] Preferably, a slide groove is horizontally opened on the inner side of the coil winding rack, a material picking slider is slidably provided in the slide groove, a material picking cylinder is provided on both sides of the upper end of the material picking slider, and a movable material picking plate with a circular arc concave surface is horizontally provided on the end of the material picking cylinder, a driving screw is threaded through the material picking slider, one end of the driving screw is transmission-connected to a servo motor, and the servo motor is installed at one end inside the slide groove, so as to realize the lifting, removal and movement of the winding roller without manual unloading.

[0011] Preferably, a tensioning cylinder is provided at the upper end of the inner side of the tensioning roller frame, and an adjusting tensioning roller is provided at the bottom of the tensioning cylinder. Coil supporting and conveying rollers are provided on both sides of the adjustable tensioning roller frame, and guide uprights are vertically provided at the bottom of the supporting and conveying rollers. Reset elastic parts are sleeved on the guide uprights, and one end of the reset elastic part is connected to a movable plate that guides and slides on the guide uprights. A supporting and limiting roller is rotatably provided in a through groove provided on the inner side of the movable plate, and positioning plates for positioning the coil tensioning are provided on both sides of the supporting and limiting rollers, so as to realize tension adjustment during coil conveying and real-time limiting by using the supporting and limiting rollers.

[0012] Preferably, the upper and lower ends of the inner side of the hot air dryer are provided with hollow air collecting plates, one side of the air collecting plates is evenly provided with air outlet pipe heads for blowing out hot air, and coil drying conveying rollers for conveying the coiled materials are laterally equidistantly provided between the air collecting plates, so as to achieve drying and air-drying treatment of the coiled materials after roller coating.

[0013] Preferably, a coil sewing cylinder is provided at the inner upper end of the sewing machine, and coil sewing plates for pressing and sewing the coils are provided at the bottom of the coil sewing cylinder and the inner bottom end of the sewing machine, so as to press the double-layer coils into one for conveying and coating.

[0014] Preferably, a cutting cylinder is provided at the upper inner end of the platform of the clamping hydraulic shear, a counter-pressing shear plate is provided at the bottom of the cutting cylinder, a pressing platform is provided on the corresponding bottom side of the pressing platform, pressing rollers are provided on both sides of the pressing platform, and coil pressing rollers are provided on the corresponding upper ends of the pressing rollers installed on both sides of the pressing platform, so that cutting and pressing can be performed after the winding roller is wound up.

[0015] The present invention also provides a production method for double-sided color coating of pre-coated metal coils, which specifically comprises the following steps:

[0016] S1. First, two rolls of coils are transported to the double-layer composite shear by pinch rollers to be cut into different required widths. The cut coils are transported to the stitching machine by pinch rollers for overlapping stitching and output;

[0017] S2. The stitched coils are tensioned and conveyed in a tensioning roller frame to ensure the tightness of the coils during conveying and avoid positional deviation. The tensioned coils are positioned at the conveying position by supporting limiting rollers. The tensioned and positioned coils are conveyed to multiple conveying rollers in the coil entrance looper for conveying, so that the coils can maintain their tightness during conveying.

[0018] S3. The coil is conveyed through the coil entrance loop to maintain continuous tension, and the correction roller is used to correct the position so that the coil is always in the same position during conveyance. The coil is then conveyed to the coil cleaning box to clean the iron filings and impurities on both sides of the coil. The cleaned coil is conveyed to the hot air dryer to perform hot air drying on the water stains on the coil;

[0019] S4. The coiled material after hot air drying is transported to a double-head roller coating box, and the coating is evenly applied on both sides of the coiled material to enhance the uniformity of the coating on the coiled material. Thereafter, the coiled material is transported to a coating coil conveying curing box for curing and drying. The cured and dried coiled material is transported to a water cooling box for cooling, and the cooled coiled material is transported to a hot air dryer for air drying of the surface moisture;

[0020] S5. The air-dried coil is conveyed to the film-coating box to attach a layer of lining paper to the surface of the coil to protect the surface of the coil. Then the coated coil is conveyed to the coil outlet loop for compact tensioning and conveying, so that the coil is more compact. The coil passes through the clamping hydraulic shear and is reeled through the coil reeling rack.

[0021] S6. After the winding roller on the coil winding rack is wound up, the coil is cut and pressed by a clamping hydraulic shear, and the winding roller is lifted up and supported by a movable material taking plate and moved out of the coil winding rack, thereby completing the double-sided color processing of the metal coil.

[0022] Compared with the prior art, the technical effects and advantages of the present invention are as follows: the production line for double-sided color coating of pre-coated metal coils and the production method thereof, through the combined use of the tensioning cylinder, the adjusting tensioning roller, the supporting conveying roller, the guide upright, the reset elastic member, the movable plate, the supporting limiting roller and the positioning plate in the tensioning roller frame, the coil is conveyed by the supporting conveying roller during the stitching conveying, and when the coil is loose, the tensioning cylinder pushes the adjusting tensioning roller downward for tensioning, and the adjusting tensioning roller moves downward to press the coil onto the supporting limiting roller during the tensioning and positions the coil using the positioning plate, so that the coil is always kept in the initial position of the conveying, and at the same time, the adjusting tensioning roller moves upward and the supporting limiting roller follows the upward movement with the assistance of the movable plate, the reset elastic member and the guide rod, so that the coil can always be in the same position during the tension adjustment, and there will be no positional offset and the phenomenon of conveying wrinkles due to coil loosening.

[0023] Through the cooperation of the lifting cylinder, the positioning pressure block, the winding roller and the coil winding frame, the winding roller is placed on the coil winding frame and pneumatically pressed by the positioning pressure block to make the winding roller reel up the coil. After the winding of the winding roller is completed, the lifting cylinder lifts the positioning pressure block to unlock and press the winding roller into position, which is conducive to automatically ejecting and unloading the winding roller that has completed winding. There is no need to manually lift the winding roller down to unload the material, which further improves the efficiency of coil unloading of the production line.

[0024] Through the coordinated use of the slide, the material picking slider, the material lifting cylinder, the movable material picking plate, the driving screw and the servo motor, the movable material picking plate can be moved back and forth laterally on the inner side of the coil winding rack, and the material lifting cylinder can be used to lift the winding roller on the coil winding rack into the air by the movable material picking plate, and the servo motor is used to drive the driving screw to drive the movement of the material picking slider, so that the movable material picking plate can drive the winding roller that has completed the winding to move to one side, so that the wound coil can be automatically moved for unloading operation, making it more convenient to load and unload the coils, and there is no need for manual loading and unloading, further improving the coil production progress. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 It is a structural schematic diagram of the present invention;

[0026] Figure 2 It is a schematic diagram of the tension roller frame structure of the present invention;

[0027] Figure 3 It is a schematic diagram of the side structure of the tensioning roller frame of the present invention;

[0028] Figure 4 This is a schematic diagram of the structure of the coil winding frame of the present invention;

[0029] Figure 5 It is a schematic diagram of the side view structure of the winding roller of the present invention;

[0030] Figure 6 This is a schematic diagram of the main structure of the clamping hydraulic shear of the present invention;

[0031] Figure 7 It is a schematic diagram of the main structure of the hot air dryer of the present invention.

[0032] In the figure: 1. Unwinding roller; 2. Pinch roller; 3. Double-layer composite shear; 4. Sewing machine; 5. Tension roller frame; 6. Coil inlet looper; 7. Correction roller; 8. Coil cleaning box; 9. Hot air dryer; 10. Double-head roller coating box; 11. Coil conveying and curing box; 12. Water cooling box; 13. Hot air dryer; 14. Laminating box; 15. Coil outlet looper; 16. Pinch hydraulic shear; 17. Coil winding frame; 18. Lifting cylinder; 19. Positioning block; 20. Winding roller; 21. Slide; 22. Material taking slider; 23. Ejector Cylinder; 24. Movable feeding plate; 25. Driving screw; 26. Servo motor; 27. Tensioning cylinder; 28. Adjusting tensioning roller; 29. ​​Supporting conveying roller; 30. Guide vertical rod; 31. Resetting elastic member; 32. Movable plate; 33. Supporting limiting roller; 34. Positioning plate; 35. Air collecting plate; 36. Air outlet pipe head; 37. Coil drying conveying roller; 38. Coil sewing cylinder; 39. Coil sewing plate; 40. Cutting cylinder; 41. Pressing and shearing plate; 42. Pressing and shearing table; 43. Pressing and shearing roller; 44. Coil pressing roller. DETAILED DESCRIPTION

[0033] 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.

[0034] See also Figure 1-7 The present invention provides a technical solution: a production line for double-sided color coating of pre-coated metal coils, comprising two unwinding rollers 1, and a pinching roller 2 at the coil output end of the two unwinding rollers 1 for clamping and conveying the coils, which can keep the coils stable during transportation and will not have the phenomenon of white swinging, and a double-layer composite shear 3 is provided at the output end of the pinching roller 2 for cutting the conveyed coils into required sizes and shapes, and compound cutting the edges of the coils into different sizes, and a sewing machine 4 is provided at the output end of the double-layer composite shear 3 for sewing the double-layer coils to sew the coils into one, and a tensioning roller frame 5 is provided at the output end of the sewing machine 4 for adjusting the tension of the coils after sewing to prevent deviation and wrinkles, so that the tensioning force can be adjusted during the coil transportation, and the tensioning degree during the coil transportation is strengthened, and a coil entrance looper 6 is provided at the output end of the tensioning roller frame 5 for continuing the coil transportation, and the coil entrance looper 6 ensures the production The strips produced are continuous, because when the strips are connected, the surplus strips of the loops ensure that sufficient time is provided for the connection, which can effectively absorb the speed fluctuations in the production process and ensure the stability and quality of the coated steel plate during the transmission process. The output end of the coil inlet loop 6 is provided with a correction roller 7 for conveying and correcting the coils, so that the coils are conveyed in the center position and the offset coils are corrected. The coil output end of the correction roller 7 is provided with a coil cleaning box 8 for cleaning impurities and dust on the surface of the coils, so that the surface of the coils is kept clean and tidy to avoid defects in the coating. The coil conveying end of the coil cleaning box 8 is provided with a hot air dryer 9 for hot air drying the cleaned coils, and the water stains produced by washing on the coils are air dried. The coil output end of the hot air dryer 9 is provided with a double-headed roller coating box 10 for evenly rolling the coating on the surface of the coils. The coating is evenly applied to the surface of the coils through two roller systems. One roller is responsible for taking materials from the coating pool, and the other is responsible for evenly coating the coating on the coils. This design ensures the thickness consistency and coating quality of the coating and avoids the problem of uneven coating.

[0035] The coil output end of the double-headed roller coating box 10 is provided with a coil conveying and curing box 11 for curing the coating on the surface of the coil, and the coating on the surface of the coil is cured at high temperature. The output end of the coil conveying and curing box 11 is provided with a water cooling box 12 for water cooling the coil after curing, so that the high-temperature coil is cooled by water. The output end of the water cooling box 12 is provided with a hot air dryer 13 for drying the coil after cooling, and the water on the coil is blown dry with high-temperature gas.

[0036] The output end of the hot air dryer 13 is provided with a coating box 14 for coating the surface of the coil, and a layer of lining paper is coated on the coated surface for protection. The coil output end of the coating box 14 is provided with a coil outlet looper 15 for compactly winding the coil, which is used to detect and adjust the speed relationship between adjacent frames, thereby realizing tension-free rolling. By forming a curved arc between the two frames, it buffers the change of the second flow rate between the frames, thereby eliminating the tension between the frames and improving the accuracy of the size of the rolled piece. The output end of the coil outlet looper 15 is provided with a clamping hydraulic shear 16, and the output end of the clamping hydraulic shear 16 is provided with a coil winding rack 17 for winding the processed coil.

[0037] Lifting cylinders 18 are provided on both sides of the end of the coil winding frame 17 through support plates, so that the positioning pressure block 19 can move up and down to movably press and limit the rotating shafts at both ends of the winding roller 20, and the bottom surface of the positioning pressure block 19 is provided with an arc-shaped pressing groove. Positioning pressure blocks 19 are fixed on the ends of the lifting cylinder 18 to realize the positioning of the winding roller 20. A winding roller 20 for winding the coil is placed on the coil winding frame 17, which is used to wind the coil after processing.

[0038] A slide groove 21 is horizontally opened on the inner side of the coil winding rack 17, so that the material picking slider 22 can slide in the slide groove 21, and a limiting slide groove is provided in the material picking slider 22, and the limiting block sliding in the limiting slide groove is fixedly connected to the bottom of the material picking slider 22, and a material picking slider 22 is slidably provided in the slide groove 21, and a lifting cylinder 23 is provided on both sides of the upper end of the material picking slider 22, so that the movable material picking plate 24 can move up and down, and a movable material picking plate 24 with a circular arc concave surface is horizontally provided on the end of the lifting cylinder 23, which can lift the winding roller 20, and a driving screw 25 is threaded through the material picking slider 22, and one end of the driving screw 25 is transmission-connected to a servo motor 26, and the servo motor 26 is installed at one end inside the slide groove 21, so that the lifted winding roller 20 automatically moves for unloading.

[0039] A tensioning cylinder 27 is provided at the upper inner end of the tensioning roller frame 5 to push the adjusting tensioning roller 28 to move for tensioning. An adjusting tensioning roller 28 is provided at the bottom of the tensioning cylinder 27. Coil support and conveying rollers 29 are provided on both sides of the tensioning roller frame 5 to realize the support and conveying of the coil during tensioning. A guide vertical rod 30 is vertically provided at the bottom of the supporting and conveying roller 29 to enable the movable plate 32 to move vertically up and down. A reset elastic member 31 is sleeved on the guide vertical rod 30, and one end of the reset elastic member 31 is connected to a movable plate 32 that guides and slides on the guide vertical rod 30. A support and limiting roller 33 is rotatably provided in a through groove provided on the inner side of the movable plate 32. Positioning plates 34 for positioning the coil tensioning are provided on both sides of the supporting and limiting roller 33, which have the function of follow-up positioning of the coil during tensioning.

[0040] The upper and lower ends of the inner side of the hot air dryer 9 are provided with hollow air collecting plates 35, which are connected to an external fan and a heater. One side of the air collecting plates 35 is evenly provided with air outlet pipe heads 36 for blowing out hot air, so that the generated hot air is discharged to dry the surface of the coiled material. Coil drying conveying rollers 37 for conveying the coiled materials are horizontally equidistantly provided between the air collecting plates 35 to achieve stable support and conveying of the coiled materials.

[0041] A coil sewing cylinder 38 is provided at the upper inner end of the sewing machine 4, and a coil sewing plate 39 for pressing and sewing the coil is provided at the bottom of the coil sewing cylinder 38 and the inner bottom end of the sewing machine 4, so that the double-layer conveyed plate is pressed and sewn together for integrated conveying and double-sided roller coating operation.

[0042] A cutting cylinder 40 is provided at the upper inner end of the platform of the clamping hydraulic shear 16, and a counter-pressing shear plate 41 is provided at the bottom of the cutting cylinder 40, and a pressing platform 42 is provided at the corresponding bottom side of the pressing platform 42, and pressing rollers 43 are provided on both sides of the pressing platform 42, and the corresponding upper ends of the pressing rollers 43 are provided with coil pressing rollers 44 installed on both sides of the pressing plate 41, so that the coil is pressed after cutting, and the pressing rollers 43 are used to rotate through an external motor to convey the coil during pressing.

[0043] The present invention also provides a production method for double-sided color coating of pre-coated metal coils, which specifically comprises the following steps:

[0044] S1. First, two rolls of coils are respectively transported to the double-layer composite shear 3 by the pinch roller 2 to be cut into different required width sizes, and the cut coils are transported to the stitching machine 4 by the pinch roller 2 for overlapping stitching and output;

[0045] S2. The stitched coil is tensioned and conveyed by the tensioning roller frame 5 to ensure the tightness of the coil during conveying and avoid positional deviation, and the tensioned coil is positioned by the supporting limit roller 33. The tensioned and positioned coil is conveyed to the multiple conveying rollers in the coil entrance looper 6 for conveying, so that the coil can maintain its tightness during conveying;

[0046] S3. The coil is conveyed through the coil entrance looper 6 to maintain continuous tension, and the correction roller 7 is used to correct the position so that the coil is always in the same position during conveyance. The coil is then conveyed to the coil cleaning box 8 to clean the iron filings and impurities on both sides of the coil. The cleaned coil is conveyed to the hot air dryer 9 to perform hot air drying on the water stains on the coil;

[0047] S4. The coiled material after hot air drying is transported to the double-head roller coating box 10, and the coating is evenly applied to both sides of the coiled material to enhance the uniformity of the coating on the coiled material. Thereafter, the coiled material is transported to the coating coil conveying curing box 11 for curing and drying. The cured and dried coiled material is transported to the water cooling box 12 for cooling, and the cooled coiled material is transported to the hot air dryer 13 for air drying of the surface moisture;

[0048] S5. The air-dried coil is conveyed to the film-coating box 14 to attach a layer of liner paper to the surface of the coil to protect the surface of the coil, and then the coated coil is conveyed to the coil outlet looper 15 for compact tensioning and conveying, so that the coil is more compactly wound, and the coil passes through the clamping hydraulic shear 16 and is wound by the coil winding rack 17;

[0049] S6. After the winding roller on the coil winding rack 17 is wound up, the coil is cut and pressed by the clamping hydraulic shear 16, and the winding roller 20 is lifted up and supported by the movable material taking plate 24 and moved out of the coil winding rack 17, thereby completing the double-sided color processing of the metal coil.

[0050] Specifically, when in use, the two rolls of coiled materials are first transported to the double-layer composite shear 3 by the clamping roller 2 to be cut into the required different width sizes, the cut coiled materials are transported to the stitching machine 4 by the clamping roller 2 for overlapping and stitching and output, the stitched coiled materials are tensioned and transported by the tensioning roller frame 5 to ensure the tightness of the coiled materials during transportation and avoid position deviation, and the tensioned coiled materials are positioned for transportation position by the supporting limiting roller 33, and the tensioned and positioned coiled materials are transported to the multiple conveying rollers in the coil entrance looper 6 for transportation, so that the coiled materials can ensure continuous tightness during transportation, and the coiled materials are continuously tensioned when passing through the coil entrance looper 6, and the correction roller 7 is used to correct the position so that the coiled materials always remain in the same position during transportation, and then the coiled materials are transported to the coil cleaning box 8 to clean the iron filings on both sides of the coiled materials. The cleaned coil is transported to the hot air dryer 9 for hot air drying of the water stains on the coil after cleaning, and the coil is transported to the double-head roller coating box 10, where the coating is evenly applied to both sides of the coil to enhance the uniformity of the coating on the coil. Thereafter, the coated coil is transported to the coil conveying curing box 11 for curing and drying of the coating, and the cured and dried coil is transported to the water cooling box 12 for cooling, and the cooled coil is transported to the hot air dryer 13 for air drying of the surface moisture, and the air-dried coil is transported to the coating box 14 to attach a layer of lining paper to the surface of the coil to protect the surface of the coil, and then the coated coil is transported to the coil outlet loop 15 for compact tensioning and transportation to make the coil winding more compact, and the coil passes through the clamping hydraulic shear 16 and is wound by the coil winding rack 17.

[0051] Finally, it should be noted that the above is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, it is still possible for those skilled in the art to modify the technical solutions described in the aforementioned embodiments or to make equivalent substitutions for some of the technical features therein. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A production line for double-sided color coating of pre-coated metal coils, comprising two unwinding rollers (1), and pinch rollers (2) at the coil output ends of the two unwinding rollers (1) for clamping and conveying the coils, and a double-layer composite shear (3) for cutting the conveyed coils into required sizes and shapes is provided at the output ends of the pinch rollers (2), characterized in that: The output end of the double-layer composite shear (3) is provided with a sewing machine (4) for sewing the double-layer coils, the output end of the sewing machine (4) is provided with a tensioning roller frame (5) for adjusting the tension of the coils after sewing to prevent deviation and wrinkles, the output end of the tensioning roller frame (5) is provided with a coil entrance looper (6) for continuing the coil transmission, the output end of the coil entrance looper (6) is provided with a correction roller (7) for conveying and correcting the coil, the coil output end of the correction roller (7) is provided with a coil cleaning box (8) for cleaning impurities and dust on the surface of the coil, the coil conveying end of the coil cleaning box (8) is provided with a hot air dryer (9) for hot air drying the cleaned coil, and the coil output end of the hot air dryer (9) is provided with a double-head roller coating box (10) for uniformly coating the coating on the surface of the coil.

2. A production line for double-sided color coating of pre-coated metal coils according to claim 1, characterized in that: The coil output end of the double-headed roller coating box (10) is provided with a coil conveying and curing box (11) for curing the coating on the surface of the coil, the output end of the coil conveying and curing box (11) is provided with a water cooling box (12) for water cooling the coil after curing, and the output end of the water cooling box (12) is provided with a hot air dryer (13) for drying the coil after cooling.

3. A production line for double-sided color coating of pre-coated metal coils according to claim 2, characterized in that: The output end of the hot air dryer (13) is provided with a coating box (14) for coating the surface of the coiled material, the coiled material output end of the coating box (14) is provided with a coiled material outlet looper (15) for compactly winding the coiled material, the output end of the coiled material outlet looper (15) is provided with a clamping hydraulic shear (16), and the output end of the clamping hydraulic shear (16) is provided with a coiled material winding rack (17).

4. A production line for double-sided color coating of pre-coated metal coils according to claim 3, characterized in that: Lifting cylinders (18) are provided on both sides of the ends of the coiled material winding frame (17) through support plates, and positioning pressure blocks (19) are fixed to the ends of the lifting cylinders (18). A winding roller (20) for winding the coiled material is placed on the coiled material winding frame (17).

5. A production line for double-sided color coating of pre-coated metal coils according to claim 4, characterized in that: A slide groove (21) is transversely provided on the inner side of the coil winding frame (17), a material taking slider (22) is slidably provided in the slide groove (21), a material pushing cylinder (23) is provided on both sides of the upper end of the material taking slider (22), and a movable material taking plate (24) with a circular arc concave surface is horizontally provided at the end of the material pushing cylinder (23), a driving screw (25) is threadedly penetrated in the material taking slider (22), one end of the driving screw (25) is transmission-connected to a servo motor (26), and the servo motor (26) is installed at one end inside the slide groove (21).

6. A production line for double-sided color coating of pre-coated metal coils according to claim 1, characterized in that: A tensioning cylinder (27) is provided at the upper inner end of the tensioning roller frame (5), and an adjusting tensioning roller (28) is provided at the bottom of the tensioning cylinder (27). Coiled material supporting and conveying rollers (29) are provided on both sides of the tensioning roller frame (5), and a guide upright rod (30) is vertically provided at the bottom of the supporting and conveying roller (29). A reset elastic member (31) is sleeved on each of the guide upright rods (30), and one end of the reset elastic member (31) is connected to a movable plate member (32) that guides and slides on the guide upright rod (30). A support limiting roller (33) is rotatably provided in a through groove provided on the inner side of the movable plate member (32), and positioning plates (34) for positioning the coiled material tensioning are provided on both sides of the support limiting roller (33).

7. A production line for double-sided color coating of pre-coated metal coils according to claim 1, characterized in that: The upper and lower ends of the inner side of the hot air dryer (9) are provided with hollow air collecting plates (35), one side of the air collecting plates (35) is evenly provided with air outlet pipe heads (36) for blowing out hot air, and coil drying conveying rollers (37) for conveying coils are equidistantly arranged laterally between the air collecting plates (35).

8. A production line for double-sided color coating of pre-coated metal coils according to claim 1, characterized in that: A coil sewing cylinder (38) is provided at the inner upper end of the sewing machine (4), and a coil sewing plate (39) for pressing and sewing the coil is provided at the bottom of the coil sewing cylinder (38) and the inner lower end of the sewing machine (4).

9. A production line for double-sided color coating of pre-coated metal coils according to claim 5, characterized in that: A cutting cylinder (40) is provided at the upper inner end of the platform of the clamping hydraulic shear (16), a shearing plate (41) is provided at the bottom of the cutting cylinder (40), a shearing platform (42) is provided at the corresponding bottom side of the shearing plate (41), shearing rollers (43) are provided on both sides of the shearing platform (42), and coil pressing rollers (44) are provided at the corresponding upper ends of the shearing rollers (43) which are installed on both sides of the shearing plate (41).

10. A production method for double-sided color coating of pre-coated metal coils according to any one of claims 1 to 9, characterized in that: The specific steps include: S1. First, two rolls of coils are respectively transported to a double-layer composite shear (3) by a pinch roller (2) to be cut into different required widths, and the cut coils are transported to a stitching machine (4) by a pinch roller (2) to be overlapped and stitched and then output; S2. The stitched coil is tensioned and conveyed in a tensioning roller frame (5) to ensure the tightness of the coil during conveying and avoid positional deviation, and the tensioned coil is positioned at the conveying position by a supporting limiting roller (33). The tensioned and positioned coil is conveyed to a plurality of conveying rollers in a coil entrance looper (6) for conveying, so that the coil maintains its tightness during conveying; S3. The coil is conveyed through the coil entrance looper (6) to maintain continuous tension, and the correction roller (7) is used to correct the position of the coil so that the coil is always in the same position during conveyance. The coil is then conveyed to the coil cleaning box (8) to clean the iron filings and impurities on both sides of the coil. The cleaned coil is conveyed to the hot air dryer (9) to perform hot air drying on the water stains on the coil; S4. The coiled material after hot air drying is conveyed to a double-head roller coating box (10), and the coating is evenly applied to both sides of the coiled material to enhance the uniformity of the coating on the coiled material. Thereafter, the coiled material is conveyed to a coil conveying curing box (11) for curing and drying of the coating. The cured and dried coiled material is conveyed to a water cooling box (12) for cooling, and the cooled coiled material is conveyed to a hot air dryer (13) for drying of the surface moisture. S5. The air-dried coil is conveyed to the film-coating box (14) to attach a layer of lining paper to the surface of the coil to protect the surface of the coil. The coated coil is then conveyed to the coil outlet looper (15) for compact tensioning and conveying to make the coil more compact. The coil passes through the clamping hydraulic shear (16) and is reeled through the coil reeling rack (17). S6. After the winding roller on the coil winding frame (17) is wound up, the coil is cut and pressed by the clamping hydraulic shear (16), and the winding roller (2) is lifted up and supported by the movable material taking plate (24) and moved out of the coil winding frame (17), thereby completing the double-sided color processing of the metal coil.

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