A coating device for double-sided coating of tinplate

Abstract

The application relates to a coating device for double-sided coating of tinplate, which comprises a rack, a sliding frame, two coating parts and an adjusting part, the sliding frame is slidably connected to the rack in the vertical direction, the two coating parts are arranged on the rack and the sliding frame respectively, the adjusting part is used for changing the distance between the two coating parts, the coating part comprises a smoothing roller and a coating pipe, the smoothing roller is parallel to the width direction of the tinplate, the smoothing roller is rotationally connected to the corresponding rack body, the length direction of the coating pipe is parallel to the length direction of the smoothing roller, the coating pipe is located behind the smoothing roller, the coating pipe is arranged on the corresponding rack body, a coating opening is arranged on the side wall of the coating pipe, and the coating opening faces the tinplate surface. The application has the effect of double-sided coating of the tinplate.

Description

Technical Field

[0001] This application relates to the field of tinplate production, and in particular to a coating apparatus for double-sided coating of tinplate. Background Technology

[0002] Tinplate is essentially a tin-plated thin steel sheet, which is a metal material made by electroplating a uniform tin layer on the surface of a low-carbon thin steel sheet, followed by passivation and coating. It is a commonly used metal packaging substrate.

[0003] Currently, Chinese utility model patent CN220514553U discloses a tinplate printing coating device, including a base with a supply roll, a box, and a storage roll. The box is internally divided into a coating chamber and a drying chamber, separated by partitions. A horizontal plate is installed in the coating chamber, with a liquid supply device above it and a coating device to the right of the liquid supply device. The coating device includes a cylinder, a movable plate, and a nozzle. The cylinder is vertically fixed to the top of the box, and its extension rod is connected to a horizontal movable plate. A nozzle is located below the movable plate, and a corrugated pipe connects to the top of the nozzle, communicating with a liquid outlet pipe. The cylinder's extension rod is also connected to a connecting plate, which has an inverted U-shaped connecting rod. The left side of the connecting rod extends into a storage tank, and the lower end of the connecting rod is connected to a horizontal stirring plate. This application is designed to improve the generation of bubbles during coating.

[0004] When tinplate is used for food packaging or packaging requiring corrosion resistance, it needs to be coated on both sides. There is an urgent need for a device that can coat tinplate on both sides. Utility Model Content

[0005] In order to coat tinplate on both sides, this application provides a coating apparatus for coating tinplate on both sides.

[0006] This application provides a coating apparatus for double-sided coating of tinplate, which adopts the following technical solution: A coating apparatus for double-sided coating of tinplate includes a frame, a sliding frame, two coating components, and an adjusting component. The sliding frame is vertically slidably connected to the frame. The two coating components are respectively disposed on the frame and the sliding frame. The adjusting component is used to change the distance between the two coating components. Each coating component includes a smoothing roller and a coating tube. The smoothing roller is parallel to the width direction of the tinplate and is rotatably connected to a corresponding frame. The length direction of the coating tube is parallel to the length direction of the smoothing roller. The coating tube is located behind the smoothing roller and is disposed on a corresponding frame. A coating opening is provided on the side wall of the coating tube, and the coating opening faces the surface of the tinplate.

[0007] By adopting the above technical solution, coating components are set on the frame and the sliding frame that slides vertically on the frame, respectively, to directly achieve synchronous coating of the upper and lower surfaces of tinplate. The smoothing roller in the coating component is parallel to the width direction of the tinplate and is rotatably connected to the corresponding frame. It can contact the tinplate before coating to smooth out wrinkles or attached impurities on its surface, reducing the problems of air bubbles and uneven coating during the subsequent coating process. The coating tube is in the same length direction as the smoothing roller and is located behind the smoothing roller, with the coating port facing the tinplate surface, which can ensure that the coating is accurately applied to the area of ​​the tinplate to be coated. At the same time, the adjusting component can change the distance between the two coating components, so that the device can be adapted to tinplate of different thicknesses, improving the versatility of the device.

[0008] Optionally, the adjusting component includes a sliding block, a connecting rod, an adjusting screw, and an adjusting motor. The sliding block is slidably connected to the sliding frame in a horizontal direction. One end of the connecting rod is rotatably connected to the sliding block, and the other end of the connecting rod is rotatably connected to the frame. The length direction of the adjusting screw is parallel to the sliding direction of the sliding block, and the adjusting screw is rotatably connected to the sliding frame. The adjusting motor is mounted on the sliding frame and is used to drive the adjusting screw to rotate.

[0009] By adopting the above technical solution, the adjusting screw is rotated by an adjusting motor. Since the length direction of the adjusting screw is parallel to the sliding direction of the sliding block and is rotatably connected to the sliding frame, the rotation of the screw will cause the sliding block to slide horizontally on the sliding frame. The sliding block is connected to the frame through a rotatably connected connecting rod. The horizontal movement of the sliding block will drive the sliding frame to move vertically through the connecting rod, thereby precisely changing the spacing between the two coated parts. Compared with simple manual adjustment, this motor-driven screw method can more accurately control the spacing, ensuring that the coated part and the tinplate surface maintain a suitable distance when coating tinplate of different thicknesses, thus improving the coating quality.

[0010] Optionally, the sliding frame is provided with a first scraping frame, the lower end face of the first scraping frame is used to abut against the tinplate surface, the first scraping frame is V-shaped, the tip of the first scraping frame faces the feeding direction of the tinplate, and a collection box for collecting paint is provided under the frame.

[0011] By adopting the above technical solution, the tip of the V-shaped first scraper faces the tinplate feeding direction, and the lower end face abuts against the tinplate surface. During the transportation of the tinplate after coating, it can scrape off excess coating on the upper surface of the tinplate. The V-shaped structure helps to guide the scraped coating to both sides, avoiding the accumulation of coating at the scraper and affecting subsequent coating or transportation. At the same time, the collection box set under the frame can collect the scraped excess coating, reduce coating waste, lower production costs, and solve the problem of difficult handling and easy waste of excess coating during the coating process.

[0012] Optionally, the first scraper has an inclined cross-section along the width direction of the tinplate, and the height of the first scraper cross-section gradually increases along the transport direction of the tinplate.

[0013] By adopting the above technical solution, the cross-section of the first scraping frame along the width of the tinplate is inclined, and the height of the cross-section gradually increases along the transport direction of the tinplate. This inclined structure allows the first scraping frame to guide the paint towards the collection box more smoothly when it contacts the tinplate surface to scrape off excess paint. This avoids the paint from getting stuck or accumulating during the scraping process due to the uniform height of the scraping frame cross-section, further improving the scraping effect and collection efficiency of excess paint, and ensuring a more uniform coating thickness on the tinplate surface.

[0014] Optionally, the frame is provided with a second scraping frame, the upper end face of which is used to abut against the tinplate surface. The second scraping frame is V-shaped, and the tip of the second scraping frame faces the feeding direction of the tinplate. A diversion groove is provided on the side wall of the second scraping frame to facilitate the paint entering the collection box.

[0015] By adopting the above technical solution, the V-shaped second scraper installed on the frame has its tip facing the tinplate feeding direction and its upper end face abutting against the tinplate surface. It can scrape off excess coating on the lower surface of the tinplate. In conjunction with the first scraper, it can achieve a comprehensive cleaning of excess coating on both the upper and lower surfaces of the tinplate, ensuring uniform coating thickness on both sides of the tinplate. At the same time, the drainage groove opened on the side wall of the second scraper can smoothly guide the scraped excess coating into the collection box, avoiding coating residue on the second scraper or dripping onto other parts of the device, further optimizing the coating collection effect and reducing coating waste and pollution to the device.

[0016] Optionally, a filter screen is provided above the collection box, and a reflux component is provided on the collection box. The reflux component includes a reflux pump and a reflux pipe. The input end of the reflux pump is connected to the collection box, and one end of the reflux pipe is located at the output end of the reflux pump. The reflux pipe is used to connect with two coating pipes.

[0017] By adopting the above technical solution, the filter screen installed above the collection box can filter the collected excess paint, remove impurities that may be contained in the paint, and ensure the purity of the recovered paint for subsequent reuse. The return component on the collection box consists of a return pump and a return pipe. The input end of the return pump is connected to the collection box, and one end of the return pipe is connected to the output end of the return pump and is used to connect to two coating pipes. The filter-recovered paint can be transported to the coating pipe through the return pipe by the return pump, realizing the recycling of paint, greatly reducing paint waste, reducing raw material costs in the production process, and also reducing the environmental impact of waste paint, which meets the production requirements of energy conservation and environmental protection.

[0018] Optionally, a heating box is provided at the rear of the frame, and two sets of heating elements are provided in the heating box. The two sets of heating elements include heating frames and several heating tubes. The two heating frames are distributed vertically and located on both sides of the tinplate, and the several heating tubes are evenly distributed on the heating frames along the transport direction of the tinplate.

[0019] By adopting the above technical solution, two sets of heating elements are vertically distributed inside the heating box and located on both sides of the tinplate. Each set of heating elements includes a heating frame and several heating tubes evenly distributed along the transport direction of the tinplate. When the coated tinplate enters the heating box, the heating tubes on both sides can simultaneously heat the coating on the upper and lower surfaces of the tinplate, allowing the coating to cure quickly. Compared with heating in one direction, this double-sided synchronous heating method can ensure that the coating on both sides of the tinplate cures at the same speed, avoiding problems such as uneven coating curing and warping caused by heating on one side. This improves the quality and efficiency of coating curing, ensures the stability of the coating during subsequent use of the tinplate, and meets the requirements of food packaging or corrosion-resistant packaging for coating curing effect.

[0020] Optionally, the heating frame is slidably connected to the heating box in a vertical direction. The heating box is equipped with a control component for adjusting the distance between the two heating elements. The control component includes a bidirectional screw and a control motor. The bidirectional screw is vertically arranged and rotatably connected to the heating box. The two heating frames are respectively threaded onto the threaded sections of the bidirectional screw with opposite directions of rotation. The control motor is used to drive the bidirectional screw to rotate.

[0021] By adopting the above technical solution, when the motor drives the bidirectional screw to rotate, the two heating frames will move in opposite directions in the vertical direction due to the opposite rotation of the threaded sections of the two heating frames. This allows for precise adjustment of the distance between the two heating elements, adapting to tinplate of different thicknesses. It ensures that the heating tube maintains a suitable heating distance from the tinplate surface, avoiding overheating and damage to the coating due to excessively close distance, or low heating efficiency and poor curing effect due to excessively far distance. This further improves the adaptability and reliability of heat curing.

[0022] In summary, this application includes at least one of the following beneficial technical effects: 1. Achieve efficient double-sided coating and adaptive adjustment for tinplate, meeting core requirements. By setting coating components separately on the frame and sliding frame, simultaneous coating of the upper and lower surfaces of tinplate is achieved, meeting the double-sided coating requirements of food packaging and other scenarios. The smoothing roller before coating smooths the tinplate surface, reducing coating bubbles and unevenness. Simultaneously, the spacing between coating components can be changed using adjustable components to accommodate tinplate of different thicknesses, improving the device's versatility. Furthermore, the two sets of heating elements in the heating chamber, working in conjunction with the adjustable structure, can simultaneously heat and cure the double-sided coating on the tinplate, adapting to different thicknesses and ensuring curing quality and efficiency. 2. The V-shaped first scraper on the sliding frame and the V-shaped second scraper on the frame scrape off excess coating from the upper and lower surfaces of the tinplate, respectively, and collect it in conjunction with the collection box; the filter screen above the collection box filters impurities, and the return component transports the filtered coating back to the coating pipe for recycling, which greatly reduces coating waste, lowers raw material costs, and reduces the environmental impact of waste coating. 3. The heating tubes inside the heating chamber are evenly distributed along the transport direction to achieve uniform heating. The spacing between the heating elements is adjustable to avoid damage to the coating or poor curing effect caused by improper heating distance, ensuring the quality of coating curing, improving the stability of tinplate packaging products, and meeting the requirements for corrosion resistance and other uses. Attached Figure Description

[0023] Figure 1 This is a schematic diagram of a coating device used for double-sided coating of tinplate.

[0024] Figure 2 yes Figure 1 A schematic diagram of the structure of the adjustment component.

[0025] Figure 3 This is a schematic diagram of the structure of the first and second scraping frames.

[0026] Figure 4 This is a schematic diagram of the heating element inside the heating chamber.

[0027] Reference numerals: 1. Frame; 2. Sliding frame; 3. Coating component; 31. Smoothing roller; 32. Coating tube; 33. Coating port; 4. Adjusting component; 41. Sliding block; 42. Connecting rod; 43. Adjusting screw; 44. Adjusting motor; 5. Heating box; 51. Heating component; 511. Heating frame; 512. Heating tube; 52. Control component; 521. Bidirectional screw; 522. Control motor; 6. First scraping frame; 7. Second scraping frame; 71. Drainage channel; 8. Collection box; 81. Filter screen; 9. Return component; 91. Return pump; 92. Return pipe. Detailed Implementation

[0028] The following is in conjunction with the appendix Figure 1 - Appendix Figure 4 This application will be described in further detail.

[0029] This application discloses a coating apparatus for double-sided coating of tinplate. (Refer to...) Figure 1 and Figure 2 A coating device for double-sided coating of tinplate includes a frame 1, a sliding frame 2, two coating parts 3, an adjusting component 4, and a heating box 5. The frame 1 and the heating box 5 are distributed along the transport direction of the tinplate. The sliding frame 2 is slidably connected to the frame 1 in the vertical direction. The two coating parts 3 correspond to the frame 1 and the sliding frame 2 respectively. The adjusting component 4 is used to change the distance between the two coating parts 3. The heating box 5 is used to heat the coated tinplate.

[0030] Reference Figure 1 and Figure 2 The adjusting component 4 includes a sliding block 41, two connecting rods 42, an adjusting screw 43, and an adjusting motor 44. The sliding block 41 is horizontally and parallel to the transport direction of the tinplate and is slidably connected to the sliding frame 2. The length direction of the adjusting screw 43 is parallel to the sliding direction of the sliding block 41, and the adjusting screw 43 is rotatably connected to the sliding frame 2. The sliding block 41 is threadedly connected to the adjusting screw 43. The adjusting motor 44 is fixedly mounted on the sliding frame 2, and the output shaft of the adjusting motor 44 is fixedly connected to one end of the adjusting screw 43. The two connecting rods 42 are distributed along the width direction of the tinplate. One end of the connecting rod 42 is rotatably connected to the sliding block 41, and the other end of the connecting rod 42 is rotatably connected to the frame 1.

[0031] Reference Figure 2 and Figure 3 The coating component 3 includes a smoothing roller 31 and a coating tube 32. The length direction of the smoothing roller 31 is parallel to the width direction of the tinplate. The smoothing roller 31 is rotatably connected to the corresponding frame and is used to abut against the surface of the tinplate. The coating tube 32 is located between the smoothing roller 31 and the heating box 5. The length direction of the coating tube 32 is parallel to the length direction of the smoothing roller 31. The coating tube 32 is fixedly set on the corresponding frame and has a coating opening 33 facing the surface of the tinplate.

[0032] Reference Figure 2 and Figure 3A second scraping frame 7 is fixedly installed on the frame 1. The second scraping frame 7 is located on the side of the coating tube 32 away from the smoothing roller 31. The projection of the second scraping frame 7 in the vertical direction is V-shaped. The tip of the second scraping frame 7 faces the coating tube 32. The upper end face of the second scraping frame 7 is used to abut against the tinplate surface. Several guide grooves 71 are opened on the side wall of the second scraping frame 7 facing the coating tube 32. The guide grooves 71 are distributed along the length direction of the second scraping frame 7 and extend in the vertical direction. A first scraping frame 6 is fixedly installed on the sliding frame 2. The first scraping frame 6 is located above the second scraping frame 7. The projection of the first scraping frame 6 in the vertical direction is V-shaped. The tip of the first scraping frame 6 faces the coating tube 32. The cross section of the first scraping frame 6 in the width direction of the tinplate is inclined. The height of the first scraping frame 6 gradually increases along the transport direction of the tinplate. The lower end face of the first scraping frame 6 is used to abut against the tinplate surface.

[0033] Reference Figure 2 and Figure 3 A collection box 8 is installed on the frame 1, located directly below the coating component 3. The collection box 8 is used to collect the coatings dripping from the coating tube 32, the first scraper 6, the second scraper 7, and the tinplate. A filter screen 81 is fixedly installed on the collection box 8 to filter the dripping coatings. A return component 9 is installed on the collection box 8, which includes a return pump 91 and a return pipe 92. The return pump 91 is fixedly installed on the side wall of the collection box 8, and its input end is connected to the collection box 8. One end of the return pipe 92 is fixedly installed at the output end of the return pump 91. The return pipe 92 is used to input coatings into the two coating tubes 32. The return pipe 92 is a flexible hose.

[0034] Reference Figure 1 and Figure 4 The heating chamber 5 is equipped with two sets of heating elements 51, which are distributed vertically and located on both sides of the tinplate. Each heating element 51 includes a heating frame 511 and several heating tubes 512. The heating frame 511 is slidably connected to the heating chamber 5 in the vertical direction, and the heating tubes 512 are distributed along the transport direction of the tinplate. The heating tubes 512 are fixedly mounted on the heating frame 511. The heating chamber 5 is equipped with a control element 52 for adjusting the distance between the two heating frames 511. The control element 52 includes a bidirectional screw 521 and a control motor 522. The bidirectional screw 521 is vertically mounted and rotatably connected to the heating chamber 5. The two heating frames 511 are threadedly connected to the opposite threaded sections of the bidirectional screw 521. The control motor 522 is fixedly mounted on the heating chamber 5, and the output shaft of the control motor 522 is fixedly connected to one end of the bidirectional screw 521.

[0035] The implementation principle of a coating device for double-sided coating of tinplate in this application embodiment is as follows: during operation, the distance between the two coating parts 3 is first adjusted by the adjusting component 4 to match the thickness of the tinplate to be treated. The adjusting motor 44 in the adjusting component 4 drives the adjusting screw 43 to rotate, so that the sliding block 41 slides horizontally along the sliding frame 2. Then, the connecting rod 42 drives the sliding frame 2 to move vertically along the frame 1 to realize the adjustment of the distance between the two coating parts 3.

[0036] The tinplate moves along the transport direction, first passing through the smoothing roller 31 in the coating component 3 to smooth out wrinkles and impurities. Then, the coating tube 32 applies coating to the upper and lower surfaces of the tinplate simultaneously through the coating port 33. After coating, the tinplate continues to move, and the first scraping frame 6 on the sliding frame 2 and the second scraping frame 7 on the frame 1 scrape off the excess coating from its upper and lower surfaces respectively. The scraped coating and the coating dripping during the coating process fall into the collection box 8 below. After impurities are filtered by the filter screen 81 above the collection box 8, the filtered coating is transported back to the coating tube 32 for recycling by the return pump 91 of the return component 9 through the return pipe 92.

[0037] Finally, the scraped tinplate enters the heating chamber 5. Inside the heating chamber 5, the spacing between the two sets of heating elements 51 is adjusted by the control element 52 to simultaneously heat the double-sided coating of the tinplate, thereby achieving coating curing and completing the double-sided coating treatment of the tinplate.

[0038] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. A coating apparatus for double-sided coating of tinplate, characterized in that: The system includes a frame (1), a sliding frame (2), two coating components (3), and an adjusting component (4). The sliding frame (2) is slidably connected to the frame (1) in the vertical direction. The two coating components (3) are respectively set on the frame (1) and the sliding frame (2). The adjusting component (4) is used to change the distance between the two coating components (3). The coating component (3) includes a smoothing roller (31) and a coating tube (32). The smoothing roller (31) is parallel to the width direction of the tinplate. The smoothing roller (31) is rotatably connected to the corresponding frame. The length direction of the coating tube (32) is parallel to the length direction of the smoothing roller (31). The coating tube (32) is located behind the smoothing roller (31). The coating tube (32) is set on the corresponding frame. A coating port (33) is opened on the side wall of the coating tube (32). The coating port (33) faces the surface of the tinplate.

2. The coating apparatus for double-sided coating of tinplate according to claim 1, characterized in that: The adjusting component (4) includes a sliding block (41), a connecting rod (42), an adjusting screw (43), and an adjusting motor (44). The sliding block (41) is slidably connected to the sliding frame (2) in the horizontal direction. One end of the connecting rod (42) is rotatably connected to the sliding block (41), and the other end of the connecting rod (42) is rotatably connected to the frame (1). The length direction of the adjusting screw (43) is parallel to the sliding direction of the sliding block (41). The adjusting screw (43) is rotatably connected to the sliding frame (2). The adjusting motor (44) is mounted on the sliding frame (2) and is used to drive the adjusting screw (43) to rotate.

3. A coating apparatus for double-sided coating of tinplate according to claim 1, characterized in that: The sliding frame (2) is provided with a first scraping frame (6), the lower end face of the first scraping frame (6) is used to abut against the tinplate surface, the first scraping frame (6) is V-shaped, and the tip of the first scraping frame (6) faces the feeding direction of the tinplate. The frame (1) is provided with a collection box (8) for collecting paint.

4. A coating apparatus for double-sided coating of tinplate according to claim 3, characterized in that: The first scraper (6) has an inclined cross section along the width direction of the tinplate, and the height of the first scraper (6) cross section gradually increases along the transport direction of the tinplate.

5. A coating apparatus for double-sided coating of tinplate according to claim 3, characterized in that: The frame (1) is provided with a second scraper (7), the upper end of the second scraper (7) is used to abut against the surface of the tinplate, the second scraper (7) is V-shaped, the tip of the second scraper (7) faces the feeding direction of the tinplate, and the side wall of the second scraper (7) is provided with a diversion groove (71) to facilitate the paint to enter the collection box (8).

6. A coating apparatus for double-sided coating of tinplate according to claim 3, characterized in that: A filter screen (81) is provided above the collection box (8), and a return component (9) is provided on the collection box (8). The return component (9) includes a return pump (91) and a return pipe (92). The input end of the return pump (91) is connected to the collection box (8), and one end of the return pipe (92) is located at the output end of the return pump (91). The return pipe (92) is used to connect with two coating pipes (32).

7. A coating apparatus for double-sided coating of tinplate according to claim 1, characterized in that: A heating box (5) is provided at the rear of the frame (1). Two sets of heating elements (51) are provided in the heating box (5). The two sets of heating elements (51) include heating racks (511) and several heating tubes (512). The two heating racks (511) are distributed vertically and located on both sides of the tinplate. Several heating tubes (512) are evenly distributed on the heating racks (511) along the transport direction of the tinplate.

8. A coating apparatus for double-sided coating of tinplate according to claim 7, characterized in that: The heating frame (511) is slidably connected to the heating box (5) in the vertical direction. The heating box (5) is provided with a control component (52) for adjusting the distance between the two heating elements (51). The control component (52) includes a bidirectional screw (521) and a control motor (522). The bidirectional screw (521) is vertically arranged and rotatably connected to the heating box (5). The two heating frames (511) are respectively threaded to the threaded sections of the bidirectional screw (521) with opposite directions of rotation. The control motor (522) is used to drive the bidirectional screw (521) to rotate.

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