Secondary spraying and drying device for metal can protection

Abstract

The utility model relates to a metal can protection secondary spraying and drying device which comprises a primary spraying device, a secondary spraying device is arranged on one side of the primary spraying device, and the primary spraying device and the secondary spraying device are respectively connected with a drying furnace through conveying channels inclining downwards. The interior of the drying furnace is divided into a primary drying channel and a secondary drying channel through a grid plate, the output end of the primary drying channel is provided with a conveying mechanism used for horizontally conveying metal cans into the lifting device, and the lifting device is connected with the secondary spraying device through an air channel inclining downwards. The device is favorable for improving the production efficiency of metal cans.

Description

Technical Field

[0001] The utility model relates to a secondary spraying and drying device for metal can protection. Background Art

[0002] Metal cans are often used to package beverages and foods such as eight-treasure porridge and coconut water. Due to the corrosive nature of acidic beverages, such as coconut water cans, metal cans are often manufactured with inadequately protected interiors, which can easily lead to blackening and corrosion spots, affecting the taste of the beverage or causing it to spoil.

[0003] During the welding or shrinking process, metal cans will be scratched internally. To prevent acidic beverages from corroding the can body, the inner wall of the metal can and the inner side of the can lid usually need to be sprayed with protective coating twice to prevent the scratched areas from being completely covered by the first spray. The existing spraying method is to first spray all the metal cans with protective coating once and dry them, then collect the batch of metal cans and stack them on pallets, and then put the batch of metal cans into the spraying production line for a second spraying and drying. This processing method is not only inefficient and not conducive to the continuous production of metal cans, but also requires the use of a large number of pallets. The metal cans that need to be sprayed and dried once need to take up a lot of space and consume a lot of manpower. Utility Model Content

[0004] The purpose of the utility model is to provide a metal can protective secondary spraying and drying device, which helps to improve the production efficiency of metal cans.

[0005] The technical solution of the present utility model is: a metal can protective secondary spraying and drying device, including a primary spraying device, a secondary spraying device is arranged on one side of the primary spraying device, the primary spraying device and the secondary spraying device are respectively connected to the drying furnace via a downward inclined conveying channel, the drying furnace is divided into a primary drying channel and a secondary drying channel by a grid plate, the output end of the primary drying channel is provided with a conveying mechanism for horizontally delivering the metal can into a lifting device, and the lifting device is connected to the secondary spraying device via a downward inclined aerial channel.

[0006] Furthermore, the primary spraying device and the secondary spraying device both include an input mechanism for sequentially inputting horizontal metal cans, a magnetic wheel is vertically arranged on the lower side of the input mechanism, and a plurality of placement grooves are evenly distributed on the magnetic wheel along the circumferential direction, the front lower part of the magnetic wheel of the primary spraying device is sequentially provided with a can wall sprayer and a can cover sprayer along the conveying direction of the metal can; the front lower part of the magnetic wheel of the secondary spraying device is provided with a can cover sprayer; the lower side of the magnetic wheel is provided with an output mechanism for separating the metal can from the magnetic wheel, and the output mechanism is the input end part of the conveying channel.

[0007] Furthermore, the input mechanism includes a vertically arranged screw shaft driven to rotate by a motor, a side baffle is provided on one side of the screw shaft, and protective plates are respectively provided on the front and rear sides between the side baffle and the screw shaft to form a feeding channel, and an input channel is connected to the upper side of the feeding channel.

[0008] Furthermore, the output mechanism includes a pair of lower guide rods that are arranged obliquely and extend in the conveying direction, and limiting baffles are provided on both sides above the pair of lower guide rods. A stripping baffle is provided above the pair of lower guide rods, and the upper end of the stripping baffle has an arc-shaped stripping guide portion that extends between the two wheel discs and close to the annular magnetic block.

[0009] Furthermore, the magnetic wheel includes wheels located on the front and rear sides and concentrically installed on the rotating shaft, the wheel is provided with a number of corresponding recesses at intervals along the circumferential direction, and annular magnetic blocks installed on the rotating shaft are provided on the inner side of the wheel. The radius of the annular magnetic block is smaller than the distance between the nearest point of the recess and the axis of the rotating shaft, and rollers for supporting the outer side of the metal can are rotatably connected between two adjacent recesses on the wheel.

[0010] Furthermore, a pair of arc-shaped guard plates with adjustable spacing are provided on one side of the magnetic wheel disc, and a driving wheel for driving the metal can to rotate is provided between the pair of arc-shaped guard plates and next to the tank wall sprayer; the nozzle of the tank wall sprayer is set obliquely downward, and the nozzle of the tank cover sprayer is set longitudinally.

[0011] Furthermore, a metal conveyor belt is arranged horizontally in the drying furnace, an import guard plate is arranged on the upper side of the input end of the metal conveyor belt in the drying furnace, the grid plate is arranged horizontally in the drying furnace and on the upper side of the metal conveyor belt, and an export guard plate extending to the conveying mechanism is arranged on the upper side of the output end of the metal conveyor belt.

[0012] Furthermore, the conveying mechanism includes a first belt conveying mechanism longitudinally arranged at the output end of the primary drying channel, the output end of the first belt conveying mechanism is connected to a spiral channel that is inclined downward and changes the metal can from vertical to horizontal, and the output end of the spiral channel is connected to the input end of the lifting device; a second belt conveying mechanism is longitudinally arranged at the end of the secondary drying channel.

[0013] Furthermore, the lifting device includes a supporting stand, on which a conveyor belt is vertically installed, and metal discs are rotatably connected to the front sides of the upper and lower parts of the conveyor belt on the supporting stand, and a magnetic plate is vertically provided on the back side of the working surface of the conveyor belt, and the upper and lower ends of the magnetic plate are provided with arc-shaped portions turning toward the rear side of the metal disc, and an arc-shaped guide channel is provided on the front side of the metal disc and at a position corresponding to the arc-shaped portion of the magnetic plate; one end of the arc-shaped guide channel on the lower side is connected to the output end of the conveying mechanism, and the other end extends to the front side of the conveyor belt and extends upward for a distance; one end of the arc-shaped guide channel on the upper side extends to the front side of the conveyor belt and extends downward for a distance, and the other end is connected to an aerial channel inclined downward and leading to the input end of the secondary spraying device.

[0014] Furthermore, the arc-shaped guide channel includes a pair of upper limiting guard bars and a pair of lower supporting guard bars, and a side guard bar is arranged on the front side between the upper limiting guard bar and the lower supporting guard bar. The upper limiting guard bar, the lower supporting guard bar and the side guard bar are connected to the supporting stand via the mounting frame.

[0015] Compared with the existing technology, the present invention has the following advantages: the metal can protective secondary spraying and drying device facilitates continuous secondary spraying and drying of incoming metal cans, effectively improving metal can production efficiency, ensuring the protective spraying effect of the metal cans, and effectively saving the use of pallets. At the same time, it reduces the space occupied by the workshop and fully improves the utilization rate of the drying furnace. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a simplified structural diagram of the utility model;

[0017] Figure 2 It is a structural diagram of the primary spraying device or the secondary spraying device of the utility model;

[0018] Figure 3 For the utility model Figure 2 Schematic diagram of direction B;

[0019] Figure 4 For the utility model Figure 2 AA cross-sectional view;

[0020] Figure 5 This is a side view of the installation of the tank wall sprayer and tank cover sprayer of the utility model;

[0021] Figure 6 This is a schematic diagram of the cooperation between the arc-shaped guard plate and the longitudinal fixing plate of the present utility model;

[0022] Figure 7 It is a cross-sectional view of the conveying channel of the present utility model;

[0023] Figure 8 This is a cross-sectional view of the drying furnace of the present utility model;

[0024] Figure 9 For the utility model Figure 8 Magnified view of area C;

[0025] Figure 10 This is a schematic structural diagram of the lifting device of the present utility model;

[0026] Figure 11 For the utility model Figure 10 Magnified view of area D;

[0027] Figure 12 For the utility model Figure 11 EE cross-sectional view or cross-sectional view of the air passage;

[0028] Figure 13 For the utility model Figure 12 FF cross-sectional view;

[0029] Figure 14 It is a partial rear view of the lifting device of the utility model;

[0030] In the figure: 1 - metal can 100 - primary spraying device 110 - input mechanism 111 - motor 112 - screw shaft 113 - side baffle 114 - protective plate 115 - input channel 116 - fixing frame 117 - adjusting bolt 120 - magnetic wheel 121 - placement groove 122 - rotating shaft 123 - wheel 124 - annular magnetic block 125 - roller 130 - tank wall sprayer 140 - tank cover sprayer 150 - output mechanism 151 - Lower guide rod 152 - Limit baffle 153 - Stripping baffle 1531 - Arc stripping guide 1532 - Protective layer 154 - Fixed frame 1541 - Adjustment slot 155 - Adjustment bolt 160 - Arc guard plate 161 - Longitudinal fixing plate 162 - Longitudinal adjustment slot 163 - Locking bolt 170 - Drive wheel 180 - Collection trough 200 - Secondary spraying device 210 - Conveying channel 300 - Drying oven 301 - Metal conveyor belt 302 - Import guard plate 303 - Export guard plate 310 - Grid plate 311 - Primary drying channel 312 - Secondary drying channel 320 - First belt conveyor mechanism 330 - Spiral channel 331 - Upper limit rod 332 - Lower limit rod 333 - Side limit rod 334 - Fixing frame 335 - Connecting bolt 340 - Second belt conveyor mechanism 400 - Lifting device 410 - Support stand 420 - Conveyor belt 421 - Active roller Wheel 422 - driven roller 423 - motor 424 - belt 425 - tensioning rod 426 - guardrail 430 - metal disc 440 - magnetic plate 441 - arc portion 450 - arc guide channel 451 - upper side limiting guard bar 452 - lower side supporting guard bar 453 - side guard bar 454 - upper hanging plate 455 - horizontal plate 456 - downward folding vertical plate 457 - lower side plate 458 - adjustment slot 459 - connecting bolt 500 - air channel. DETAILED DESCRIPTION

[0031] To make the above features and advantages of the present invention more clearly understood, embodiments are given below with reference to the accompanying drawings for detailed description, but the present invention is not limited thereto.

[0032] refer to Figures 1 to 14

[0033] A metal can protective secondary spraying and drying device comprises a primary spraying device 100 connected to a metal can input channel 115, a secondary spraying device 200 is provided on one side of the primary spraying device, the primary spraying device and the secondary spraying device are respectively connected to a drying furnace 300 via a downward inclined conveying channel 210, the drying furnace is divided into a primary drying channel 311 and a secondary drying channel 312 by a grid plate 310, the output end of the primary drying channel is provided with a conveying mechanism for horizontally delivering the metal can into a lifting device 400, and the lifting device is connected to the secondary spraying device via a downward inclined air channel 500.

[0034] The metal cans are horizontally fed into the primary spraying device 100 in sequence for primary spraying of the can wall and the can cover; the metal cans after the primary spraying are vertically fed into the primary drying channel on one side of the drying furnace for primary drying; the metal cans after the primary drying are output and lifted to a high position through the lifting device 400, and the lifted metal cans are horizontally fed into the secondary spraying device 200 arranged on one side of the primary spraying device through the air channel 500 for secondary spraying of the can cover; the metal cans after the secondary spraying are vertically fed into the secondary drying channel on the other side of the drying furnace for secondary drying; the metal cans after the secondary drying are output.

[0035] In this embodiment, both the primary and secondary spraying devices include an input mechanism 110 for connecting to an input channel 115 for metal cans and sequentially feeding horizontal metal cans. A magnetic wheel 120 is vertically positioned below the input mechanism. The magnetic wheel is evenly distributed along its circumference, allowing falling metal cans to fall into the receiving grooves and be attracted by the magnetic wheel, which then rotates with it. A wall sprayer 130 and a lid sprayer 140 are positioned along the front lower portion of the magnetic wheel of the primary spraying device, along the direction of can transport. These sprays coat the inner wall and bottom of the metal cans with protective coating, respectively. A lid sprayer is positioned at the front lower portion of the magnetic wheel of the secondary spraying device, allowing for a secondary spraying of the inner surface of the lid. An output mechanism 150 is positioned below the magnetic wheel, which removes the metal cans from the magnetic wheel. This output mechanism forms the input portion of the transport channel.

[0036] In this embodiment, the conveying channel is a spiral channel, so that the metal cans are input into the drying furnace in a vertical position instead of a horizontal position.

[0037] In this embodiment, to allow incoming metal cans to sequentially drop into the placement grooves of the magnetic wheel, the input mechanism includes a vertically mounted screw shaft 112 driven by a motor 111. A side baffle 113 is located on one side of the screw shaft. Protective plates 114 are located between the side baffle and the front and rear sides of the screw shaft, forming a material discharge channel. A metal can input channel 115 is connected to the upper side of the discharge channel. The rotation of the screw shaft causes the metal cans to sequentially drop into the grooves of the magnetic wheel.

[0038] In this embodiment, the spiral shaft has spiral ridges on the outside, and the spiral pitch of the spiral shaft is greater than the diameter of the metal can. The spiral shaft is a plastic shaft or a metal shaft with an outer layer wrapped with a rubber layer.

[0039] In this embodiment, the protective plates are longitudinally fixed with adjusting bolts 117, which pass through the fixing brackets 116 on the frame and are locked by nuts. The adjusting bolts help to adjust the distance between the two protective plates.

[0040] In this embodiment, the magnetic wheel includes a wheel 123 located on the front and rear sides and concentrically mounted on the rotating shaft 122. The rotating shaft can be driven to rotate by a stepper motor or an electric indexing turntable. The wheel is provided with a number of corresponding recesses spaced apart in the circumferential direction. For example, the number of recesses is 8, and the two recesses corresponding to the two turntables cooperate to form a placement groove. An annular magnetic block 124 is provided on the inner side of each wheel and is mounted on the rotating shaft. The radius of the annular magnetic block is smaller than the distance between the nearest point of the recess and the axis of the rotating shaft, thereby providing magnetic attraction while preventing the metal can from being directly adsorbed on the annular magnetic block, preventing the metal can from escaping from the placement groove, and also facilitating the subsequent separation of the metal can from the magnetic wheel.

[0041] In this embodiment, rollers 125 are rotatably connected to the wheel disc between adjacent recesses for supporting the outer side of the metal can. The circumference of the rollers protrudes beyond the recesses, allowing the rollers to support the outer surface of the metal can, preventing direct contact between the metal can and the side of the recess and facilitating subsequent rotation of the metal can within the placement groove. The rollers are coated with a rubber layer to prevent scratches on the metal can surface.

[0042] In this embodiment, a pair of adjustable curved shields 160 are located on one side of the magnetic wheel. A drive wheel 170, designed to rotate the metal can, is located between the two curved shields and next to the tank wall sprayer. The drive wheel can be driven by a motor through a speed reducer or by a circular belt and is covered with a rubber layer. When the tank wall sprayer is spraying the protective coating on the metal can, the drive rotates the metal can to ensure a uniform coating on the can wall.

[0043] In this embodiment, a longitudinal fixing plate 161 is provided on the frame, a longitudinal adjustment slot 162 is provided on the longitudinal fixing plate, and locking bolts 163 passing through the longitudinal adjustment slot are fixed on the arc-shaped guard plates.

[0044] In this embodiment, the nozzle of the tank wall sprayer is positioned diagonally downward to better coat the tank wall; the nozzle of the tank cover sprayer is positioned longitudinally to better coat the tank cover. A sump 180 is located below the nozzles of the tank wall and tank cover sprayers to catch any dripping protective coating, preventing it from dripping onto equipment and affecting the workshop environment.

[0045] In this embodiment, in order to allow the painted metal can to be separated from the magnetic turntable and output, the output mechanism includes a pair of lower guide rods 151 arranged obliquely downward and extending in the conveying direction, and a limit baffle 152 is provided on both sides above the pair of lower guide rods. A stripping baffle 153 is provided above the pair of lower guide rods, and the upper end of the stripping baffle has an arc-shaped stripping guide portion 1531 extending between the two wheels and close to the annular magnetic block. Therefore, when the metal can rotates to the bottom of the magnetic turntable and rotates upward, the metal can contacts the arc-shaped stripping guide portion, causing the metal can to separate from the placement groove and enter the output mechanism. The lower guide rods, limit baffles, and stripping baffles spirally extend toward the drying furnace and form a conveying channel.

[0046] In this embodiment, in order to prevent the metal can from being scratched, the bottom plate of the stripping baffle is provided with a protective layer 1532, such as a rubber pad, etc. A protective layer can also be provided on the lower guide rod.

[0047] In this embodiment, the stripping baffle and the limiting baffle may also be rods.

[0048] In this embodiment, in order to realize the connection between the lower guide rod, the limit baffle, the stripping baffle and the frame and adjust the position, fixed frames 154 are arranged at intervals along the transmission direction of the output mechanism and are sleeved on the outside of the lower guide rod, the limit baffle, and the stripping baffle. The lower guide rod, the limit baffle, and the stripping baffle are all fixed with adjusting bolts 155 that pass through the fixed frame and are locked by nuts. The fixed frame is provided with an adjusting slot 1541, and their respective positions are adjusted by adjusting the bolts.

[0049] In this embodiment, the frame is also provided with a device for detecting whether the metal can enters the tank wall sprayer station, so that when it is detected that the metal can enters the tank wall sprayer station, the tank wall sprayer sprays once, and then when the metal can rotates to the tank cover sprayer station, it is sprayed once again by the tank cover sprayer.

[0050] During the primary coating process, cans are fed through the input channel and dropped into the discharge channel. The spiral mechanism then descends, one by one, into the receiving grooves of the magnetic turntable. The cans rotate with the magnetic turntable. When they reach the wall sprayer station, the drive wheel rotates the cans, while the wall sprayer sprays the inner wall with protective coating. The cans continue rotating with the magnetic turntable until they reach the lid sprayer station, where the lid sprayer applies protective coating to the lids. The cans continue rotating with the magnetic turntable until they encounter the curved stripping guide, releasing them from the receiving grooves and conveyed into the primary drying channel via an inclined discharge mechanism.

[0051] When a can is ready for secondary coating, it is fed through the input channel and dropped into the discharge channel. The spiral mechanism then descends, one by one, into the placement grooves of the magnetic turntable. The can rotates with the magnetic turntable until it reaches the can lid sprayer, which sprays the can lids with protective coating. The can continues to rotate with the magnetic turntable. When it encounters the curved stripping guide, it is released from the placement groove and conveyed into the secondary drying channel via an inclined discharge mechanism.

[0052] In this embodiment, a metal conveyor belt 301 is disposed transversely within the drying oven. An inlet guard plate 302 is positioned above the inlet end of the metal conveyor belt to ensure smooth entry of metal cans onto the metal conveyor belt. The grid plate is disposed transversely within the drying oven and above the metal conveyor belt, thereby forming a primary drying channel and a secondary drying channel on either side of the metal conveyor belt. An outlet guard plate 303, extending to the conveyor mechanism, is positioned above the outlet end of the metal conveyor belt. The metal cans at the rear push the metal cans at the front onto the outlet guard plate, allowing the metal cans to enter the conveyor mechanism and be delivered.

[0053] In this embodiment, the conveyor mechanism includes a first belt conveyor 320 longitudinally arranged at the output end of the primary drying tunnel. The output end of the first belt conveyor is connected to a downwardly inclined spiral channel 330 that rotates the cans from a vertical position to a horizontal position (rotating them 90°). The output end of the spiral channel is connected to the input end of a lifting device. A second belt conveyor 340 is longitudinally arranged at the end of the secondary drying tunnel. This second belt conveyor outputs the cans after secondary spray drying and palletizing them. The output guards extend to the upper sides of the first and second belt conveyors, respectively, to facilitate the separate output of the cans.

[0054] In this embodiment, the spiral channel includes a pair of upper limiting rods 331, a pair of lower limiting rods 332, and side limiting rods 333 located on both sides. Fixed frames 334 are arranged at intervals along the length direction of the spiral channel. The upper limiting rods, lower limiting rods, and side limiting rods are all connected to the fixed block through connecting bolts 335.

[0055] In this embodiment, the lifting device includes a support stand 410, on which a conveyor belt 420 is vertically installed. Metal discs 430 are rotatably connected to the front of the upper and lower parts of the conveyor belt on the support stand. A magnetic plate 440 is vertically arranged on the back of the working surface of the conveyor belt. The upper and lower ends of the magnetic plate are provided with arc-shaped portions 441 that turn toward the rear side of the metal disc. An arc-shaped guide channel 450 is provided on the front side of the metal disc and at a position corresponding to the arc-shaped portion of the magnetic plate; one end of the arc-shaped guide channel on the lower side is connected to the spiral channel of the conveying mechanism, and the other end extends to the front side of the conveyor belt and extends upward for a distance; one end of the arc-shaped guide channel on the upper side extends to the front side of the conveyor belt and extends downward for a distance, and the other end is connected to an aerial channel that is inclined downward and leads to the input end of the secondary spraying device.

[0056] After the cans in the spiral channel enter the lower curved guide channel, they attach to the metal disc located below. The cans, pushed by the metal cans from behind, rotate the disc and move to the front of the conveyor belt. The conveyor belt, in conjunction with the upward extension of the curved guide channel, uses the magnetic force of the magnetic plate to carry the cans upward. The cans then enter the upper curved guide channel and, further transported upward, are pushed into the downward-sloping overhead channel. The cans then roll into the input port of the secondary spraying device for a subsequent coat of protective coating.

[0057] In this embodiment, to drive the conveyor belt, a driving roller 421 and a driven roller 422 are mounted on the upper and lower ends of the support frame, respectively, to drive the conveyor belt. The driving rollers are driven by a drive mechanism. The drive mechanism is a driving pulley mounted on the support frame and driven by a motor 423. The driving pulley is connected to a driven pulley mounted on the end of the driving roller's shaft via a belt 424.

[0058] In this embodiment, in order to tension the transmission belt, a tensioning rod 425 for tensioning the transmission belt is provided at the lower portion of the support stand. Guardrails 426 are provided on both sides of the transmission belt to limit the position of the metal can on the transmission belt.

[0059] In this embodiment, the curved guide channel includes a pair of upper limiting guardrails 451 and a pair of lower supporting guardrails 452. A side guardrail 453 is positioned in front of the upper limiting guardrails and the lower supporting guardrails, ensuring that one end of the metal can is free from restraint. A gap exists between the metal disc and the curved portion, allowing the disc to rotate with the can. The curved portion's magnetic force allows the end of the metal can to adhere to the disc and move onto the conveyor belt. The upper limiting guardrails, lower supporting guardrails, and side guardrails are connected to the support frame via a mounting frame to ensure their proper positioning.

[0060] Specifically, the front side of the metal disc is provided with an upper hanging plate 454 connected to the metal disc's rotating shaft, and the metal disc's rotating shaft is fixedly connected to the support frame. A horizontal plate 455, bent forward, is provided at the lower end of the upper hanging plate. An upper guard bar 451 is suspended from the lower side of the horizontal plate. A downward-folding vertical plate 456 is provided at the front end of the horizontal plate. Side guard bars 453 are provided on the inner side (rear side) of the downward-folding vertical plate. The support frame is also provided with a lower side plate 457 located below the horizontal plate. The lower support guard bar is mounted on the lower side plate. The horizontal plate, downward-folding vertical plate, and lower side plate have adjustment slots 458. The upper limit guard bar, lower support guard bar, and side guard bars are all fixed with connecting bolts 459 that pass through the adjustment slots and are locked with nuts.

[0061] If the above-mentioned terms such as "first" and "second" are used in the present invention to limit components, those skilled in the art should know that the use of "first" and "second" is only for the convenience of description to distinguish the components. Unless otherwise stated, the above terms have no special meaning.

[0062] If the present invention discloses or involves components or structural parts that are fixedly connected to each other, then, unless otherwise stated, the fixed connection can be understood as: a detachable fixed connection (for example, connection using bolts or screws), and can also be understood as: a non-detachable fixed connection (for example, riveting, welding). Of course, the mutual fixed connection can also be replaced by an integrated structure (for example, manufactured by integral molding using a casting process) (except where it is obviously not possible to use an integrated molding process).

[0063] In addition, unless otherwise stated, the terms used in any technical solution disclosed in the above-mentioned utility model to express positional relationships or shapes include states or shapes that are approximate, similar or close thereto.

[0064] Any component provided by the present invention can be assembled from multiple separate components, or can be a separate component manufactured by an integral forming process.

[0065] The above description is only a preferred embodiment of the present invention. All equivalent changes and modifications made according to the scope of the patent application of the present invention should fall within the scope of the present invention.

Claims

1. A metal can protective secondary spray drying device, characterized in that: It includes a primary spraying device, a secondary spraying device is provided on one side of the primary spraying device, the primary spraying device and the secondary spraying device are respectively connected to the drying furnace through a downward inclined conveying channel, the drying furnace is divided into a primary drying channel and a secondary drying channel by a grid plate, the output end of the primary drying channel is provided with a conveying mechanism for horizontally delivering the metal cans into a lifting device, and the lifting device is connected to the secondary spraying device through a downward inclined aerial channel.

2. The metal can protective secondary spray drying device according to claim 1 is characterized in that: The primary spraying device and the secondary spraying device both include an input mechanism for sequentially inputting horizontal metal cans, a magnetic wheel is vertically arranged on the lower side of the input mechanism, and a plurality of placement grooves are evenly distributed on the magnetic wheel along the circumferential direction, a can wall sprayer and a can cover sprayer are sequentially arranged on the front lower part of the magnetic wheel of the primary spraying device along the conveying direction of the metal can; a can cover sprayer is arranged on the front lower part of the magnetic wheel of the secondary spraying device; an output mechanism for separating the metal can from the magnetic wheel is arranged on the lower side of the magnetic wheel, and the output mechanism is the input end part of the conveying channel.

3. The metal can protective secondary spray drying device according to claim 2 is characterized in that: The input mechanism includes a vertically arranged screw shaft driven to rotate by a motor, a side baffle is provided on one side of the screw shaft, and protective plates are provided on the front and rear sides between the side baffle and the screw shaft to form a feeding channel, and an input channel is connected to the upper side of the feeding channel.

4. The metal can protective secondary spray drying device according to claim 2, characterized in that: The output mechanism includes a pair of lower guide rods that are arranged obliquely and extend in the conveying direction. Limit baffles are provided on both sides above the pair of lower guide rods. A stripping baffle is provided above the pair of lower guide rods. The upper end of the stripping baffle has an arc-shaped stripping guide portion that extends between the two wheel discs and is close to the annular magnetic block.

5. The metal can protective secondary spray drying device according to claim 2, characterized in that: The magnetic wheel includes a wheel located on the front and rear sides and concentrically installed on the rotating shaft. The wheel is provided with a number of corresponding recesses at intervals along the circumferential direction. An annular magnetic block installed on the rotating shaft is provided on the inner side of the wheel. The radius of the annular magnetic block is smaller than the distance between the nearest point of the recess and the axis of the rotating shaft. A roller for supporting the outer side of the metal can is rotatably connected between two adjacent recesses on the wheel.

6. The metal can protective secondary spray drying device according to claim 2, characterized in that: A pair of arc-shaped guard plates with adjustable spacing are provided on one side of the magnetic wheel disc, and a driving wheel for driving the metal can to rotate is provided between the pair of arc-shaped guard plates and beside the tank wall sprayer; the nozzle of the tank wall sprayer is set obliquely downward, and the nozzle of the tank cover sprayer is set longitudinally.

7. The metal can protective secondary spray drying device according to claim 1, 2, 3, 4, 5 or 6, characterized in that: A metal conveyor belt is arranged horizontally in the drying furnace, and an import guard plate is arranged on the upper side of the input end of the metal conveyor belt in the drying furnace. The grid plate is arranged horizontally in the drying furnace and on the upper side of the metal conveyor belt, and an export guard plate extending to the conveying mechanism is arranged on the upper side of the output end of the metal conveyor belt.

8. The metal can protective secondary spraying and drying device according to claim 1, 2, 3, 4, 5 or 6, characterized in that: The conveying mechanism includes a first belt conveyor mechanism longitudinally arranged at the output end of the primary drying channel, the output end of the first belt conveyor mechanism is connected to a spiral channel that is inclined downward and changes the metal can from a vertical position to a horizontal position, and the output end of the spiral channel is connected to the input end of the lifting device; a second belt conveyor mechanism is longitudinally arranged at the end of the secondary drying channel.

9. The metal can protective secondary spray drying device according to claim 1, 2, 3, 4 or 6, characterized in that: The lifting device includes a supporting frame, on which a conveyor belt is vertically installed, and metal discs are rotatably connected to the front sides of the upper and lower parts of the conveyor belt on the supporting frame, and a magnetic plate is vertically arranged on the back side of the working surface of the conveyor belt, and the upper and lower ends of the magnetic plate are provided with arc-shaped parts turning toward the rear side of the metal disc, and an arc-shaped guide channel is provided on the front side of the metal disc and at a position corresponding to the arc-shaped part of the magnetic plate; one end of the arc-shaped guide channel on the lower side is connected to the output end of the conveying mechanism, and the other end extends to the front side of the conveyor belt and extends upward for a distance; one end of the arc-shaped guide channel on the upper side extends to the front side of the conveyor belt and extends downward for a distance, and the other end is connected to an aerial channel inclined downward and leading to the input end of the secondary spraying device.

10. The metal can protective secondary spray drying device according to claim 9, characterized in that: The arc-shaped guide channel includes a pair of upper limiting guard bars and a pair of lower supporting guard bars. A side guard bar is provided on the front side between the upper limiting guard bar and the lower supporting guard bar. The upper limiting guard bar, the lower supporting guard bar and the side guard bar are connected to the supporting stand via a mounting frame.

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