Roll coating device for liquid outside welding seam of metal can

Abstract

The utility model discloses a metal can welding seam external liquid roll coating device which comprises a machine frame, a metal can conveying device, a paint supply device, a material brushing wheel and a driving device capable of driving the material brushing wheel to rotate, the metal can conveying device, the paint supply device and the driving device are respectively installed on the machine frame, and the material brushing wheel is arranged above the metal can conveying device. The coating flattening device is characterized by further comprising a coating flattening device body and a coating sweeping device body, and the coating flattening device body and the coating sweeping device body are installed on the machine frame and arranged above the metal can conveying device. The brushing wheel, the coating flattening device and the coating sweeping device are sequentially arranged in the conveying direction of the metal can conveying device. When the liquid roll-coating device outside the metal can weld joint is used for coating the metal can weld joint, a uniform and bubble-free coating belt can be formed on the weld joint, and the quality of the metal can is effectively improved.

Description

Technical Field

[0001] The utility model relates to can making equipment, in particular to a liquid rolling coating device for the outer weld of a metal can. Background Art

[0002] The production process of metal cans involves multiple key links, among which the seam welding of the connecting edges of the can body to form welds is an important step in constructing the overall structure of the metal can. However, during the seam welding process, due to the high temperature, the original tin plating layer is inevitably oxidized, causing the metal at the weld to be directly exposed. This not only seriously affects the appearance quality of the metal can, but more importantly, it significantly reduces the corrosion resistance of the metal can, making it extremely susceptible to corrosion damage during subsequent use, thereby greatly shortening the service life of the metal can. To solve the above problems, the industry generally adopts the method of applying a coating to the welds of metal cans, aiming to provide an additional protective barrier for the welds and enhance the overall durability of the metal cans. After high-temperature drying, the coating solidifies at the welds on the outside of the can body to form a hard coating film, which effectively isolates the oxygen, moisture and other corrosive media in the external environment, significantly improving the corrosion resistance of the metal can.

[0003] Currently, the welds are typically coated by roller coating or spraying. For example, the outer weld coating device for an outer coating device for a metal three-piece can and its weld gap area, disclosed on December 28, 2016, and with publication number CN205833507U, includes a shield, a coating supply system disposed within the shield, and a coating roller disposed within the coating tank. The coating roller also includes a feed roller that cooperates with the coating roller and provides a certain amount of coating to the coating roller. However, this structure still makes it difficult to achieve uniform distribution during coating. This is because the coating roller's surface is tangential to the length of the weld, so the contact between the coating roller and the weld surface is only linear, making it difficult to achieve complete contact. This makes it very easy for the coating thickness to be uneven during movement of the can body, resulting in excessively thick coating in the middle area in direct contact, while the coating on the sides is too thin or even leaking. Furthermore, air is easily introduced during coating, causing bubbles to form in the coating strip. The spraying method also has the above problems, and the control effect on the coating thickness is even worse. Utility Model Content

[0004] The technical problem to be solved by the utility model is to provide a liquid rolling coating device for the outside of the weld of a metal can. When the liquid rolling coating device is used to recoat the weld of a metal can, a uniform bubble-free coating strip can be formed on the weld, thereby effectively improving the quality of the metal can.

[0005] In order to solve the above technical problems, the technical solutions adopted are as follows:

[0006] A liquid roller coating device for the outside of a metal can weld comprises a frame, a metal can conveying device, a paint supply device, a brush wheel and a drive device capable of driving the brush wheel to rotate, wherein the metal can conveying device, the paint supply device and the drive device are respectively mounted on the frame, and the brush wheel is arranged above the metal can conveying device. The device is characterized in that it also comprises a paint flattening device and a paint sweeping device, which are respectively mounted on the frame, and the paint flattening device and the paint sweeping device are both arranged above the metal can conveying device, and the brush wheel, the paint flattening device and the paint sweeping device are arranged in sequence along the conveying direction of the metal can conveying device.

[0007] When the above-mentioned liquid roller coating device for the outer weld seam of a metal can is in use, the metal can conveying device conveys the metal cans one by one along the extension direction of the weld seam of the metal can; when the metal can passes through the brush wheel, the brush wheel contacts the weld seam on the metal can (usually, the wheel surface of the brush wheel is tangentially matched with the extension direction of the weld seam of the metal can at this time), and the brush wheel now applies the paint conveyed from the paint supply device to the weld seam of the metal can; as the metal can is conveyed, the brush wheel gradually brushes a complete strip of paint on the entire weld seam of the metal can; the metal can that has completed the preliminary coating continues to be conveyed, When passing through the paint leveling device, the paint leveling device will level the paint strip that has not yet dried, and squeeze the paint protruding from the middle part of the paint strip to both sides, so that each position of the paint strip reaches preliminary uniformity, and at the same time squeeze out the bubbles in the paint strip; then, when the metal can moves from the paint leveling device to the paint sweeping device, the paint sweeping device can use a sweeping method to smooth out the protrusions on the paint strip caused by unevenness, and at the same time, break the bubbles that may exist on the edge of the paint strip due to squeezing, ensuring that the paint strip on the metal can weld can be uniform and free of bubbles. This liquid roller coating device outside the weld of the metal can can apply a coating to the weld of the metal can, and then make the reapplied paint strip uniform and free of bubbles by leveling and sweeping. After drying, the subsequent paint strip can form a hard coating film at the weld and perfectly combine with the coating at other positions of the can body, thereby improving the quality of the metal can.

[0008] The above-mentioned metal can conveying device can adopt a conveyor belt, and the conveyor belt is generally also provided with a positioning mechanism for the metal can, such as a positioning groove, magnetic attraction or clamping, etc.

[0009] In a preferred embodiment, the paint leveling device is located at a distance of 1 to 1.5 times the length of the can body behind the brush wheel.

[0010] In a further preferred embodiment, the paint sweeping device is located at a distance of 1 to 1.5 times the length of the can body behind the paint spreading device.

[0011] In a preferred embodiment, the paint flattening device includes a wool grinding head and a first rotating shaft. The wool grinding head is rotatably mounted on the frame via the first rotating shaft, and the side surface of the wool grinding head is a concave annular surface. The annular surface matches the curvature of the metal can body. The wool grinding head rotates passively, and the friction force when the metal can contacts the wool grinding head drives the wool grinding head to rotate, so that the wool grinding head can fully squeeze the paint strip. Because the wool fibers on the surface of the wool grinding head are soft and tough, when the wool grinding head contacts the metal can, the annular surface on the wool grinding head can squeeze the paint strip, causing the paint protruding in the middle of the paint strip to flow to both sides, without scratching the surface of the metal can.

[0012] In a preferred embodiment, the paint-smoothing device includes a second rotating shaft, a swinging rod, and a brush. The second rotating shaft is rotatably mounted on the frame, the upper portion of the swinging rod is connected to the second rotating shaft, and the brush is mounted at the lower end of the swinging rod. This arrangement allows the brush to swing when subjected to force via the swinging rod. Because the paint-smoothing device only requires lightly sweeping the paint strip, without requiring hard contact with the paint strip, the brush can contact and lightly sweep across the paint strip as the metal can passes, effectively smoothing out any bumps on the paint strip without completely scraping it off.

[0013] In a preferred embodiment, the paint supply device includes a paint tank, a paint trough, a delivery pipe, and a transfer wheel. The paint tank and paint trough are respectively mounted on the frame. The feed end of the delivery pipe is connected to the discharge end of the paint tank, and the discharge end of the delivery pipe extends into the paint trough. The transfer wheel is rotatably mounted on the frame, with the lower portion of the transfer wheel extending into the paint trough, and the wheel surface of the transfer wheel is tangential to the wheel surface of the brush wheel. The paint tank delivers paint to the paint trough through the delivery pipe. The transfer wheel dips paint from the paint trough and transfers the paint to the brush wheel through rotation.

[0014] In a further preferred embodiment, the paint supply device further comprises a scraper mechanism, comprising a scraper seat, a third rotating shaft, a torsion spring, an adjustment seat, an adjustment bolt, and a scraper. The upper end of the scraper seat is rotatably mounted on the frame via the third rotating shaft. The torsion spring is sleeved on the third rotating shaft, and one end of the torsion spring is connected to the frame and the other end is connected to the scraper seat. The adjustment seat is fixedly mounted on the frame, and a threaded hole matching the adjustment bolt is formed on the adjustment seat. The adjustment bolt is threadedly connected to the adjustment seat, and the adjustment bolt passes through the threaded hole, with the rod portion contacting the middle or lower portion of the scraper seat. The scraper is mounted at the lower end of the scraper seat, and the position of the scraper corresponds to the wheel surface of the transfer wheel. The scraper can scrape excess paint off the transfer wheel, thereby controlling the amount of paint transferred to the brush wheel. At the same time, according to different needs, the adjustment bolt can be turned to press the scraper seat downward or to swing the scraper seat upward under the action of the torsion spring, thereby adjusting the angle of the scraper seat to adjust the distance between the scraper and the transfer wheel.

[0015] In a further preferred embodiment, the lower end of the scraper holder is provided with a guide groove that matches the scraper blade, and the scraper blade is movably mounted on the lower end of the scraper holder via the guide groove. This arrangement allows the scraper blade to be adjusted along the guide groove after adjusting the angle of the scraper holder, achieving fine-tuning. Typically, the scraper holder is provided with a groove that matches the shape of the transfer wheel. The guide groove is arranged along the length of the scraper holder and extends to the groove. This arrangement enables the scraper holder to cover the transfer wheel and the scraper blade to extend into the groove and contact the transfer wheel.

[0016] In a further preferred embodiment, the drive device includes a motor, a transmission chain, a driving sprocket, and two driven sprockets. The motor is mounted on the frame, and the driving sprocket is mounted on the output shaft of the motor. The driven sprockets are rotatably mounted on the frame, and one of the driven sprockets is coaxially arranged with the brush wheel, and the other is coaxially arranged with the transfer wheel. The brush wheel and the transfer wheel rotate in opposite directions and have equal linear speeds. The transmission chain is tensioned between the driving sprocket and the two driven sprockets. The motor can drive the two driven sprockets to rotate via the driving sprocket and the transmission chain, thereby rotating the brush wheel and the transfer wheel. Since the brush wheel and the transfer wheel rotate in opposite directions and have equal linear speeds, the paint transfer can be more uniform and stable. Typically, the motor is a speed-controlled motor.

[0017] The beneficial effect of the utility model is that when the liquid roller coating device for the outer weld seam of a metal can is used to recoat the weld seam of the metal can, a uniform and bubble-free coating strip can be formed on the weld seam, thereby effectively improving the quality of the metal can. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 This is a schematic structural diagram of a liquid roller coating device for the outer weld of a metal tank in an embodiment of the present utility model;

[0019] Figure 2 for Figure 1 A magnified view of position A in the middle;

[0020] Figure 3 This is a front view of a liquid roller coating device for the outer weld of a metal tank in an embodiment of the present utility model;

[0021] Figure 4 for Figure 3 Enlarged view of position B in the middle;

[0022] Figure 5 It is a structural schematic diagram of the driving device in an embodiment of the present utility model. DETAILED DESCRIPTION

[0023] The present invention will be further described below with reference to the accompanying drawings and specific embodiments:

[0024] like Figure 1-5 The device shown is a liquid roller coating device for the outside of the weld of a metal can, comprising a frame 1, a metal can conveying device 2, a paint supplying device 3, a brush wheel 4, a driving device 5 capable of driving the brush wheel 4 to rotate, a paint leveling device 6 and a paint leveling device 7. The metal can conveying device 2, the paint supplying device 3 and the driving device 5 are respectively mounted on the frame 1, the brush wheel 4 is arranged above the metal can conveying device 2, the paint leveling device 6 and the paint leveling device 7 are respectively mounted on the frame 1, the paint leveling device 6 and the paint leveling device 7 are both arranged above the metal can conveying device 2, and the brush wheel 4, the paint leveling device 6 and the paint leveling device 7 are arranged in sequence along the conveying direction of the metal can conveying device 2.

[0025] When the above-mentioned liquid roller coating device for the outer weld of a metal can is in use, the metal can conveying device 2 conveys the metal cans one by one along the extension direction of the weld of the metal can; when the metal can passes through the brush wheel 4, the brush wheel 4 contacts the weld on the metal can (usually, at this time, the wheel surface of the brush wheel 4 is tangentially matched with the extension direction of the weld of the metal can), and the brush wheel 4 now applies the paint conveyed from the paint supply device 3 to the weld of the metal can; as the metal can is conveyed, the brush wheel 4 gradually brushes a complete strip of paint on the entire weld of the metal can; the metal can that has completed the preliminary coating continues to be conveyed When passing through the paint flattening device 6, the paint flattening device 6 flattens the paint strip that has not yet dried, and squeezes the paint protruding from the middle part of the paint strip to both sides, so that each position of the paint strip reaches preliminary uniformity, and at the same time squeezes out the bubbles in the paint strip; then, when the metal can moves from the paint flattening device 6 to the paint sweeping device 7, the paint sweeping device 7 can smooth out the protrusions on the paint strip caused by unevenness by sweeping, and at the same time, break the bubbles that may exist on the edge of the paint strip due to squeezing, ensuring that the paint strip on the weld of the metal can can be uniform and free of bubbles. This liquid roller coating device outside the weld of the metal can can apply a coating to the weld of the metal can, and then make the applied paint strip uniform and free of bubbles by flattening and sweeping, so that the subsequent paint strip can form a hard coating film at the weld after drying and perfectly combine with the coating at other positions of the can body, thereby improving the quality of the metal can.

[0026] The metal can conveying device 2 can be a conveyor belt, which is generally provided with a positioning mechanism for the metal can, such as a positioning groove, magnetic attraction or clamping.

[0027] The paint leveling device 6 is located at a distance of 1-1.5 times the length of the can body behind the brush wheel 4; the paint sweeping device 7 is located at a distance of 1-1.5 times the length of the can body behind the paint leveling device 6.

[0028] The paint leveling device 6 includes a wool grinding head 601 and a first rotating shaft 602. The wool grinding head 601 is rotatably mounted on the frame 1 via the first rotating shaft 602. The side surface of the wool grinding head 601 is a concave annular surface. The annular surface matches the curvature of the metal can body. The wool grinding head 601 rotates passively, and the friction force when the metal can contacts the wool grinding head 601 drives the wool grinding head 601 to rotate, so that the wool grinding head 601 can fully squeeze the paint strip. Because the wool fibers on the surface of the wool grinding head 601 are soft and tough, when the wool grinding head 601 contacts the metal can, the annular surface on the wool grinding head 601 can squeeze the paint strip, causing the paint protruding in the middle of the paint strip to flow to both sides, without scratching the surface of the metal can.

[0029] The paint-sweeping device 7 includes a second rotating shaft 701, a swinging rod 702, and a brush 703. The second rotating shaft 701 is rotatably mounted on the frame 1. The upper portion of the swinging rod 702 is connected to the second rotating shaft 701, and the brush 703 is mounted at the lower end of the swinging rod 702. This arrangement allows the brush 703 to swing when subjected to force. Because the paint-sweeping device 7 only needs to lightly sweep the paint strip, without requiring hard contact with the paint strip, the brush 703 can contact and lightly sweep across the paint strip as the metal can passes by, effectively smoothing out any bumps on the paint strip without completely scraping it off.

[0030] The paint supply device 3 includes a paint tank 301, a paint trough 302, a delivery pipe 303, and a transfer wheel 304. The paint tank 301 and the paint trough 302 are respectively mounted on the frame 1. The feed end of the delivery pipe 303 is connected to the discharge end of the paint tank 301, and the discharge end of the delivery pipe 303 extends into the paint trough 302. The transfer wheel 304 is rotatably mounted on the frame 1, and the lower portion of the transfer wheel 304 extends into the paint trough 302, and the wheel surface of the transfer wheel 304 is tangential to the wheel surface of the brush wheel 4. The paint tank 301 delivers paint to the paint trough 302 through the delivery pipe 303. The transfer wheel 304 picks up paint from the paint trough 302 and transfers the paint to the brush wheel 4 by rotating.

[0031] The paint supply device 3 also includes a scraper mechanism 305, which includes a scraper seat 3051, a third rotating shaft 3052, a torsion spring (not visible in the figure), an adjustment seat 3053, an adjusting bolt 3054 and a scraper 3055. The upper end of the scraper seat 3051 is rotatably mounted on the frame 1 through the third rotating shaft 3052, the torsion spring is sleeved on the third rotating shaft 3052, and one end of the torsion spring is connected to the frame 1 and the other end is connected to the scraper seat 3051; the adjusting seat 3053 is fixedly mounted on the frame 1, and a threaded hole matching the adjusting bolt 3054 is formed on the adjusting seat 3053. The adjusting bolt 3054 is threadedly connected to the adjusting seat 3053, and the adjusting bolt 3054 passes through the threaded hole and the rod is in contact with the middle of the scraper seat 3051; the scraper 3055 is mounted on the lower end of the scraper seat 3051, and the scraper 3055 corresponds to the wheel surface position of the transfer wheel 304. The scraper 3055 can scrape off excess paint on the transfer wheel 304, thereby controlling the amount of paint transferred to the brush wheel 4; at the same time, according to different needs, the adjusting bolt 3054 can be turned so that the adjusting bolt 3054 presses the scraper seat 3051 down or the scraper seat 3051 can be swung up under the action of the torsion spring, and the distance between the scraper 3055 and the transfer wheel 304 can be adjusted by adjusting the angle of the scraper seat 3051.

[0032] The lower end of the scraper seat 3051 is provided with a guide groove that matches the scraper 3055. The scraper 3055 is movably mounted on the lower end of the scraper seat 3051 via the guide groove. With this arrangement, after adjusting the angle of the scraper seat 3051, the scraper 3055 can also be adjusted along the guide groove to achieve fine-tuning. Typically, the scraper seat 3051 is provided with a groove that matches the shape of the transfer wheel 304. The guide groove is arranged along the length of the scraper seat 3051 and extends to the groove. This arrangement enables the scraper seat 3051 to cover the transfer wheel 304 and the scraper 3055 to extend into the groove and contact the transfer wheel 304.

[0033] The drive device 5 includes a motor 501, a transmission chain 502, a driving sprocket 503, and two driven sprockets 504. The motor 501 is mounted on the frame 1, and the driving sprocket 503 is mounted on the output shaft of the motor 501. The driven sprockets 504 are rotatably mounted on the frame 1, with one driven sprocket 504 coaxially disposed with the brush wheel 4, and the other driven sprocket 504 coaxially disposed with the transfer wheel 304. The brush wheel 4 and the transfer wheel 304 rotate in opposite directions and at equal linear speeds. The transmission chain 502 is tensioned between the driving sprocket 503 and the two driven sprockets 504. The motor 501 drives the two driven sprockets 504 to rotate via the driving sprocket 503 and the transmission chain 502, thereby rotating the brush wheel 4 and the transfer wheel 304. Because the brush wheel 4 and the transfer wheel 304 rotate in opposite directions and at equal linear speeds, paint transfer is more uniform and stable. The motor 501 is a speed-regulating motor 501 .

Claims

1. A liquid roller coating device for the outer weld of a metal can, comprising a frame, a metal can conveying device, a coating supply device, a brush wheel, and a drive device capable of driving the brush wheel to rotate. The metal can conveying device, the coating supply device, and the drive device are separately mounted on the frame, and the brush wheel is disposed above the metal can conveying device. The device is characterized in that: It also includes a paint leveling device and a paint sweeping device, which are respectively installed on the frame. The paint leveling device and the paint sweeping device are both arranged above the metal can conveying device, and the brush wheel, paint leveling device and paint sweeping device are arranged in sequence along the conveying direction of the metal can conveying device.

2. A liquid roller coating device for the outer weld of a metal can according to claim 1, characterized in that: The paint leveling device is located at a distance of 1 to 1.5 times the length of the can body behind the brush wheel.

3. The liquid roller coating device for the outer weld of a metal can according to claim 2, characterized in that: The paint sweeping device is located at a distance of 1 to 1.5 times the length of the can body behind the paint spreading device.

4. The liquid roller coating device for the outer weld of a metal can according to claim 1, characterized in that: The paint leveling device comprises a wool grinding head and a first rotating shaft. The wool grinding head is rotatably mounted on the frame via the first rotating shaft. The side surface of the wool grinding head is a concave annular surface.

5. The liquid roller coating device for the outer weld of a metal can according to claim 1, characterized in that: The paint sweeping device comprises a second rotating shaft, a swing rod and a brush. The second rotating shaft is rotatably arranged on the frame. The upper part of the swing rod is connected to the second rotating shaft. The brush is arranged at the lower end of the swing rod.

6. The liquid roller coating device for the outer weld of a metal can according to claim 1, characterized in that: The paint supply device includes a paint tank, a paint trough, a conveying pipe and a transfer wheel. The paint tank and the paint trough are respectively installed on the frame. The feed end of the conveying pipe is connected with the discharge end of the paint tank. The discharge end of the conveying pipe extends into the paint trough. The transfer wheel is rotatably installed on the frame, and the lower part of the transfer wheel extends into the paint trough, and the wheel surface of the transfer wheel is tangent to the wheel surface of the brush wheel.

7. A liquid roller coating device for the outer weld of a metal can according to claim 6, characterized in that: The paint supply device also includes a scraper mechanism, which includes a scraper seat, a third rotating shaft, a torsion spring, an adjusting seat, an adjusting bolt and a scraper. The upper end of the scraper seat is rotatably mounted on the frame through the third rotating shaft, the torsion spring is sleeved on the third rotating shaft, and one end of the torsion spring is connected to the frame and the other end is connected to the scraper seat; the adjusting seat is fixedly mounted on the frame, and a threaded hole matching the adjusting bolt is opened on the adjusting seat. The adjusting bolt is threadedly connected to the adjusting seat, and the adjusting bolt passes through the threaded hole and the rod contacts the middle or lower part of the scraper seat; the scraper is mounted on the lower end of the scraper seat, and the scraper corresponds to the wheel surface position of the transfer wheel.

8. The liquid roller coating device for the outer weld of a metal can according to claim 7, characterized in that: The lower end of the scraper seat is provided with a guide groove matching the scraper, and the scraper is movably arranged on the lower end of the scraper seat through the guide groove.

9. The liquid roller coating device for the outer weld of a metal can according to claim 6, characterized in that: The driving device includes a motor, a transmission chain, a driving sprocket and two driven sprockets. The motor is installed on the frame, and the driving sprocket is installed on the output shaft of the motor; the driven sprockets are rotatably installed on the frame, and one of the driven sprockets is coaxially arranged with the brush wheel, and the other driven sprocket is coaxially arranged with the transfer wheel, and the rotation directions of the brush wheel and the transfer wheel are opposite, and the rotation linear speeds are equal; the transmission chain is tensioned between the driving sprocket and the two driven sprockets.

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