A kind of can internal spraying device and method

Abstract

The present invention relates to a can internal spraying device and method, wherein a feeding part is arranged obliquely above a pre-rotation mechanism, and a cargo inlet is formed in the feeding part; a cargo outlet is arranged obliquely below the pre-rotation mechanism, and a cargo outlet is formed in the cargo outlet; the pre-rotation mechanism comprises a transfer plate and a suction cup, the transfer plate is connected to the side of a mounting plate, the suction cup is arranged in a ring shape on the transfer plate, and a cargo shaft hole is formed in the center of the transfer plate; the cargo carrying mechanism comprises a cargo tray and a cargo shaft, and the cargo tray is connected to the cargo shaft hole through the cargo shaft; the spraying mechanism is arranged on the outside of the cargo carrying mechanism, an adjustment port is formed on the inside of a spray gun seat, an adjustment block is arranged in the adjustment port, a spray gun chassis is connected to the adjustment block, a spray gun is connected to the spray gun chassis, and the spray gun faces the cargo carrying mechanism; the waste collecting mechanism comprises a paint extraction port and a waste collecting box, and the opening of the paint extraction port faces the junction of the cargo carrying mechanism and the spraying mechanism. The present invention can spray the can body under high-speed rotation, and the coating is more uniform, thereby reducing the consumption of the coating under the premise of ensuring quality.

Description

Technical Field

[0001] The invention relates to an internal spraying device and method for cans, and relates to the technical field of can production. Background Art

[0002] With the vigorous development of the can market, the demand for cans has increased year by year, and the competition in the industry has become increasingly fierce, prompting can manufacturers to continuously improve can production efficiency and reduce production costs in order to have stronger market competitiveness. This equipment came into being under this background.

[0003] In the traditional can spraying scheme, a one-time spraying method is usually used. It is difficult to take care of every corner of the inner surface of the can in one spraying. During the spraying process, the can body cannot rotate at high speed, which easily causes uneven spraying. In addition, the excess paint during the spraying process is easy to pollute the can body and the environment. The adaptability of cans of different specifications is poor, and it is impossible to achieve fast switching in the production of different types of cans, resulting in low production efficiency. Summary of the invention

[0004] The purpose of the present invention is to provide a can internal spraying device and method, which can enable the can body to receive two sprayings on the inner surface (middle mouth wall and middle lower wall) when rotating at a high speed, so that the spraying is more precise and the coating is more uniform, thereby reducing the consumption of paint while ensuring quality.

[0005] The technical solution of the present invention to solve the above technical problems is as follows: a can internal spraying device, comprising a mounting plate, a feeding part, a discharging part, a pre-rotation mechanism, a carrying mechanism, a spraying mechanism and a waste collecting mechanism; the feeding part is arranged obliquely above the pre-rotation mechanism, and the feeding part forms a goods sliding inlet; the discharging part is arranged obliquely below the pre-rotation mechanism, and the discharging part forms a goods sliding outlet;

[0006] The pre-rotation mechanism includes a transfer plate and a suction cup, wherein the transfer plate is connected to the side of the mounting plate, the suction cup is arranged in a ring shape on the transfer plate, and a cargo shaft hole is formed in the center of the transfer plate;

[0007] The cargo carrying mechanism comprises a cargo carrying tray and a cargo carrying shaft, and the cargo carrying tray is connected to the cargo carrying shaft hole through the cargo carrying shaft;

[0008] The spraying mechanism is arranged on the outside of the cargo carrying mechanism, and the spraying mechanism includes a spray gun seat, an adjustment block, a spray gun chassis and a paint spray gun. An adjustment port is formed on the inner side of the spray gun seat, the adjustment block is arranged in the adjustment port, the spray gun chassis is connected to the adjustment block, the paint spray gun is connected to the spray gun chassis, and the paint spray gun faces the cargo carrying mechanism;

[0009] The waste collection mechanism comprises a paint extraction port and a waste collection box, and the opening of the paint extraction port faces the junction of the cargo carrying mechanism and the spraying mechanism.

[0010] As a preferred solution for the internal spraying equipment of cans, the cargo feeding section is provided with an entrance cargo sliding base, a baffle bracket, a pressure strip, an entrance cargo sliding baffle bar, an entrance brush bracket and a brush body; the entrance cargo sliding base is connected to the mounting plate, the baffle bracket is connected to the entrance cargo sliding base, the pressure strip is connected to the baffle bracket, and the entrance cargo sliding baffle bar is connected to the entrance cargo sliding base; a brush shaft is provided between the entrance brush bracket and the entrance cargo sliding baffle bar, one end of the brush shaft is connected to the entrance cargo sliding base, and the brush shaft passes through the entrance cargo sliding baffle bar; the entrance brush bracket is connected to the brush shaft, the brush body is connected to the entrance brush bracket, and the brush body faces the cargo tray.

[0011] As a preferred solution for the internal spraying equipment of cans, the delivery part is provided with a fixed plate frame, a guide plate, a delivery slide, an outlet rotating rocker arm, a rotating shaft block, a movable block and a lever; the fixed plate frame is connected to the mounting plate, the guide plate is arranged on the outside of the cargo tray, the guide plate is connected to the top of the fixed plate frame, the delivery slide is connected to the mounting plate through an adapter plate, the end of the delivery slide is bent to the bottom of the guide plate, and the outlet rotating rocker arm is arranged between the guide plate and the delivery slide; the rotating shaft block is connected to the fixed plate frame, the movable block is connected to the rotating shaft block, and the lever is connected to the movable block.

[0012] As a preferred solution for the can internal spraying equipment, there are two cargo trays, which are connected to the cargo shaft in parallel and at intervals; cargo carrying ports are formed on the cargo trays, and the number of the cargo carrying ports is the same as the number of the suction cups.

[0013] As a preferred solution of the internal spraying equipment for cans, the spraying mechanism is provided with two groups, and the two groups of spraying mechanisms are located at two adjacent stations of the cargo tray.

[0014] As a preferred solution for the can internal spraying equipment, the waste collection box of the waste collection mechanism is connected to a negative pressure extraction system, a fan-shaped notch is formed at the open end of the paint extraction port, and the edge of the cargo tray passes through the position of the fan-shaped notch.

[0015] As a preferred solution for the can spraying equipment, the rear side of the mounting plate is connected to a main transmission bracket, the upper end of the main transmission bracket is provided with a motor base, the upper end of the motor base is provided with a pre-rotation motor, and the pre-rotation motor is connected to a pre-rotation belt; the front side of the mounting plate is connected to a guide wheel; the pre-rotation belt passes through the guide wheel, and the pre-rotation belt bypasses the suction cup.

[0016] As a preferred solution of the can internal spraying device, the suction cup includes a disc body and a disc roller, a suction port is formed at the center of the disc body, and the suction port is connected to the rear side of the mounting plate.

[0017] As a preferred solution for the can spraying equipment, the lower end of the main transmission bracket is connected to a main driving motor, a cam divider is provided on the rear side of the mounting plate, the main driving motor is connected to the cam divider, the cam divider is connected to the cargo shaft of the cargo pallet, and the cargo shaft is also connected to the transfer plate.

[0018] The present invention also provides a method for spraying inside cans, which uses the above-mentioned internal spraying equipment for cans, adsorbs the cans to be sprayed by a suction cup, accelerates the adsorbed cans to a preset spraying speed, and switches the stations of the cans that reach the preset speed by a rotating disk. During the station switching process, the pallet carrying the cans performs a position change action and rotates to the spraying station, and the cans arriving at the spraying station are sprayed by a plurality of groups of spraying mechanisms preset at the spraying stations.

[0019] The traditional technical solution adopts a one-time spraying method, which makes it difficult to take care of every corner of the inner surface of the can and easily causes uneven spraying. This technical solution is based on a two-time spraying process design, which allows the can body to be sprayed twice on the inner surface (middle mouth wall and middle lower wall) while rotating at high speed. Each spray is applied to different parts, which can cover a wider area of ​​the inner surface, making the spraying more precise and the coating more uniform. The consumption of paint is reduced while ensuring quality; the production speed of cans is increased and the product scrap rate is reduced; the consumption of paint per can can be accurately controlled to save costs; the pollution of excess paint to the can body and the environment is minimized; and rapid conversion in the production of different types of cans can be achieved to improve production efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the implementation methods of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for the implementation methods or the description of the prior art. Obviously, the drawings in the following description are only exemplary, and for ordinary technicians in this field, other implementation drawings can be derived from the provided drawings without creative work.

[0021] The structures, proportions, sizes, etc. illustrated in this specification are only used to match the contents disclosed in the specification so as to facilitate understanding and reading by persons familiar with the technology. They are not used to limit the conditions under which the present invention can be implemented, and therefore have no substantial technical significance. Any structural modification, change in proportion or adjustment of size shall still fall within the scope of the technical contents disclosed in the present invention without affecting the effects and purposes that can be achieved by the present invention.

[0022] Figure 1 It is a schematic diagram of the overall structure of the can spraying device provided in an embodiment of the present invention;

[0023] Figure 2This is a schematic diagram of the incoming and outgoing shipments of the can spraying equipment provided in an embodiment of the present invention;

[0024] Figure 3 A schematic diagram of the inflow and outflow of the can spraying equipment from another perspective provided in an embodiment of the present invention;

[0025] Figure 4 It is a schematic diagram of the pre-rotation mechanism of the can spraying equipment provided in an embodiment of the present invention;

[0026] Figure 5 This is a schematic diagram of a single spraying operation of the internal spraying equipment for cans provided in an embodiment of the present invention;

[0027] Figure 6 A schematic diagram of secondary spraying of the internal spraying equipment of cans provided in an embodiment of the present invention;

[0028] Figure 7 Schematic diagram of waste collection of the can spraying equipment provided in an embodiment of the present invention.

[0029] In the figure, 1, mounting plate; 2, incoming goods department; 3, outgoing goods department; 4, pre-rotation mechanism; 5, carrying goods mechanism; 6, spraying mechanism; 7, waste collection mechanism; 8, goods inlet; 9, goods outlet; 10, transfer plate; 11, suction cup; 12, carrying shaft hole; 13, carrying tray; 14, carrying shaft; 15, spray gun seat; 16, adjustment block; 17, spray gun chassis; 18, spray gun; 19, adjustment port; 20, paint extraction port; 21, waste collection box; 22, main transmission bracket; 23, motor base; 24. Pre-rotation motor; 25. Pre-rotation belt; 26. Guide wheel; 27. Disc body; 28. Disc roller; 29. ​​Suction port; 30. Main drive motor; 31. Inlet cargo sliding base; 32. Baffle bracket; 33. Pressure strip; 34. Inlet cargo sliding baffle; 35. Inlet brush bracket; 36. Brush body; 37. Fixed plate frame; 38. Guide plate; 39. Delivery slide; 40. Exit rotating rocker; 41. Rotating shaft block; 42. Movable block; 43. Push rod; 44. Cam divider. DETAILED DESCRIPTION

[0030] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the specific embodiments of the present invention are described in detail below in conjunction with the accompanying drawings. In the following description, many specific details are set forth to facilitate a full understanding of the present invention. However, the present invention can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without violating the connotation of the present invention, so the present invention is not limited by the specific embodiments disclosed below.

[0031] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art of the present invention. The terms used in the specification of the present invention are only for the purpose of describing specific embodiments and are not intended to limit the present invention.

[0032] See also Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 5 , Figure 6 and Figure 7 , provides a can internal spraying equipment, including a mounting plate 1, a feeding part 2, a discharging part 3, a pre-rotation mechanism 4, a carrying mechanism 5, a spraying mechanism 6 and a waste collecting mechanism 7; the feeding part 2 is arranged obliquely above the pre-rotation mechanism 4, and the feeding part 2 forms a cargo sliding inlet 8, and the cans to be sprayed enter the feeding part 2 through the cargo sliding inlet 8; the discharging part 3 is arranged obliquely below the pre-rotation mechanism 4, and the discharging part 3 forms a cargo sliding outlet 9, and the sprayed cans are discharged through the cargo sliding outlet 9.

[0033] Specifically, the pre-rotation mechanism 4 includes a rotary disk 10 and a suction cup 11, the rotary disk 10 is connected to the side of the mounting plate 1, the suction cup 11 is arranged in a ring on the rotary disk 10, a carrying shaft hole 12 is formed at the center of the rotary disk 10, and the carrying mechanism 5 includes a carrying tray 13 and a carrying shaft 14, and the carrying tray 13 is connected to the carrying shaft hole 12 through the carrying shaft 14. The rotary disk 10 realizes the switching of the cans at a preset speed, and the carrying tray 13 plays a limiting role in the process of switching the stations. When the stations are switched, the cans that have reached the preset speed rotate synchronously with the carrying tray 13 driven by the rotary disk 10.

[0034] Specifically, the spraying mechanism 6 is arranged outside the cargo carrying mechanism 5, and the spraying mechanism 6 includes a spray gun seat 15, an adjustment block 16, a spray gun chassis 17 and a paint spray gun 18. An adjustment port 19 is formed inside the spray gun seat 15, the adjustment block 16 is arranged in the adjustment port 19, the spray gun chassis 17 is connected to the adjustment block 16, the paint spray gun 18 is connected to the spray gun chassis 17, and the paint spray gun 18 faces the cargo carrying mechanism 5. The position of the spray gun chassis 17 can be adjusted by the adjustment block 16, and then the spraying position of the paint spray gun 18 can be adjusted.

[0035] Specifically, the waste collection mechanism 7 includes a paint extraction port 20 and a waste collection box 21, and the opening of the paint extraction port 20 faces the junction of the cargo carrying mechanism 5 and the spraying mechanism 6. Excess paint droplets generated during the spraying process are sucked into the waste collection box 21 by the paint extraction port 20, reducing the pollution of the environment and cans by excess paint.

[0036] Specifically, the rear side of the mounting plate 1 is connected with a main transmission bracket 22, the upper end of the main transmission bracket 22 is provided with a motor base 23, the upper end of the motor base 23 is provided with a pre-rotation motor 24, and the pre-rotation motor 24 is connected with a pre-rotation belt 25; the front side of the mounting plate 1 is connected with a guide wheel 26; the pre-rotation belt 25 passes through the guide wheel 26, and the pre-rotation belt 25 bypasses the suction cup 11, and the suction cup 11 includes a disk body 27 and a disk roller 28, and a suction port 29 is formed at the center of the disk body 27, and the suction port 29 is connected to the rear side of the mounting plate 1. The pre-rotation motor 24 accelerates the disk roller 28 of the suction cup 11 through the pre-rotation belt 25, and connects the negative pressure through the suction port 29 to adsorb the cans on the disk body 27, thereby ensuring the realization of pre-acceleration of the cans.

[0037] Specifically, the lower end of the main transmission bracket 22 is connected to the main drive motor 30, and the rear side of the mounting plate 1 is provided with a cam divider 44, the main drive motor 30 is connected to the cam divider 44, the cam divider 44 is connected to the cargo shaft 14 of the cargo tray 13, and the cargo shaft 14 is also connected to the transfer plate 10. The main drive motor 30 drives the cargo shaft 14 to operate through the cam divider 44, and the cargo shaft 14 can synchronously drive the transfer plate 10 and the cargo tray 13 to operate, thereby realizing the can station switching under rotation.

[0038] See also Figure 2 and Figure 3 In one embodiment of the can internal spraying device, the feeding part 2 is provided with an inlet cargo sliding base 31, a baffle bracket 32, a pressure strip 33, an inlet cargo sliding baffle 34, an inlet brush bracket 35 and a brush body 36; the inlet cargo sliding base 31 is connected to the mounting plate 1, the baffle bracket 32 ​​is connected to the inlet cargo sliding base 31, the pressure strip 33 is connected to the baffle bracket 32, and the inlet cargo sliding baffle 34 is connected to the inlet cargo sliding base 31; a brush shaft is provided between the inlet brush bracket 35 and the inlet cargo sliding baffle 34, one end of the brush shaft is connected to the inlet cargo sliding base 31, and the brush shaft passes through the inlet cargo sliding baffle 34; the inlet brush bracket 35 is connected to the brush shaft, and the brush body 36 is connected to the inlet brush bracket 35, and the brush body 36 faces the cargo tray 13.

[0039] Specifically, the delivery section 3 is provided with a fixed plate frame 37, a guide plate 38, a delivery slide 39, an exit rotating rocker arm 40, a rotating shaft block 41, a movable block 42 and a lever 43; the fixed plate frame 37 is connected to the mounting plate 1, the guide plate 38 is arranged on the outside of the cargo tray 13, the guide plate 38 is connected to the top of the fixed plate frame 37, the delivery slide 39 is connected to the mounting plate 1 through an adapter plate, the end of the delivery slide 39 is bent to the bottom of the guide plate 38, and the exit rotating rocker arm 40 is arranged between the guide plate 38 and the delivery slide 39; the rotating shaft block 41 is connected to the fixed plate frame 37, the movable block 42 is connected to the rotating shaft block 41, and the lever 43 is connected to the movable block 42.

[0040] Specifically, the cans enter the feeding section 2 composed of the inlet cargo base 31, the barrier bracket 32, the pressure strip 33, the inlet cargo barrier 34, the inlet brush bracket 35 and the brush body 36 from the conveyor line, and then enter the cargo tray 13 accurately from the inlet section 2, and are adsorbed on the suction cup 11, and are driven by the pre-rotation belt 25 to rotate at high speed (direction as shown in FIG. Figure 3 ), while the cargo tray 13 is rotated by the main drive (direction as Figure 3 ). As the cans with the tray 13 rotate, they enter the return area after the spraying action is completed. There is no adsorption effect in the delivery part 3, and the cans and the suction cups 11 are naturally separated and enter the delivery slide 39, completing the internal spraying process and entering the next process.

[0041] Specifically, the shipping department has an anti-congestion insurance function. When the channel is blocked by excessive accumulation of cans, the magnetic link of the lower baffle of the cargo outlet is pushed open, allowing the congested cans to fall into the waste tank box and trigger a shutdown, which can ensure that the equipment is not damaged and minimize the loss of waste products.

[0042] In one embodiment of the can internal spraying device, the number of the cargo trays 13 is two, and the two cargo trays 13 are connected to the cargo shaft 14 in parallel and at intervals; the cargo tray 13 is formed with cargo ports, and the number of the cargo ports is the same as the number of the suction cups 11. The cans in the spraying process are placed in the cargo ports, and each cargo port is equipped with a suction cup 11, so that each can has a suction cup 11 for adsorption and pre-acceleration.

[0043] In one embodiment of the can internal spraying device, the spraying mechanism 6 is provided with two groups, and the two groups of spraying mechanisms 6 are located at two adjacent stations of the cargo tray 13. The waste collection box 21 of the waste collection mechanism 7 is connected to a negative pressure extraction system, and a fan-shaped notch is formed at the open end of the paint extraction port 20, and the edge of the cargo tray 13 passes through the position of the fan-shaped notch.

[0044] Specifically, the pre-rotation mechanism 4 and the cargo carrying mechanism 5 have a total of six stations, and the cam divider 44 controls the transfer plate 10 and the cargo carrying plate 13 to realize intermittent rotation. The tank body enters the loading station from the inclined cargo entrance 8. At this time, the transfer plate 10 is in a resting state, and the suction cup 11 behind the station immediately adsorbs the bottom of the tank. The suction cup 11 then rotates the tank body at high speed under the drive of the pre-rotation belt 25. Then the transfer plate 10 drives the suction cup 11 to move the tank body to the first spraying station, the first spray gun is turned on, and the inner middle wall of the tank is sprayed. The first spray gun is turned off, and the tank body is transferred to the second spraying station. The second spray gun is turned on and the inner middle and lower wall of the tank is sprayed. The second spray gun is turned off, and the tank body is taken to the shipping station. The suction cup 11 stops adsorption, and the tank body leaves the equipment from the cargo outlet 9. The tank body is sprayed in a high-speed rotating state, so that each part can be sprayed evenly, and the liquid coating can be fully spread by centrifugal action. The opening, closing and spraying pressure of the spray gun are precisely controlled by the industrial PLC system. When the equipment is working, the exhaust system always uses negative pressure to discharge excess mist paint out of the equipment to avoid contaminating the can body as much as possible.

[0045] An embodiment of the present invention also provides a method for spraying inside cans, which uses the above-mentioned internal spraying equipment for cans, adsorbs the cans to be sprayed through the suction cup 11, accelerates the adsorbed cans to a preset spraying speed, and switches the cans that reach the preset speed through the transfer plate 10. During the station switching process, the cargo pallet 13 carries the cans to perform a position change and rotates to the spraying station, and the cans arriving at the spraying station are sprayed respectively by several groups of spraying mechanisms 6 preset at the spraying stations.

[0046] The present invention is provided with a mounting plate 1, a cargo inlet 2, a cargo outlet 3, a pre-rotation mechanism 4, a cargo carrying mechanism 5, a spraying mechanism 6 and a waste collecting mechanism 7; the cargo inlet 2 is arranged obliquely above the pre-rotation mechanism 4, and the cargo inlet 2 is formed with a cargo inlet 8, through which the cans to be sprayed enter the cargo inlet 2; the cargo outlet 3 is arranged obliquely below the pre-rotation mechanism 4, and the cargo outlet 9 is formed with the cargo outlet 9, through which the sprayed cans are discharged. The pre-rotation mechanism 4 includes a transfer plate 10 and a suction cup 11, the transfer plate 10 is connected to the side of the mounting plate 1, the suction cup 11 is arranged in a ring shape on the transfer plate 10, and a cargo carrying shaft hole 12 is formed in the center of the transfer plate 10, and the cargo carrying mechanism 5 includes a cargo carrying plate 13 and a cargo carrying shaft 14, and the cargo carrying plate 13 is connected to the cargo carrying shaft hole 12 through the cargo carrying shaft 14. The rotary disk 10 realizes the switching of the cans at a preset speed, and the cargo tray 13 plays a limiting role in the process of the station switching. When the station is switched, the cans that reach the preset speed rotate synchronously with the cargo tray 13 under the drive of the rotary disk 10. The spraying mechanism 6 is arranged on the outside of the cargo carrying mechanism 5, and the spraying mechanism 6 includes a spray gun seat 15, an adjustment block 16, a spray gun chassis 17 and a paint spray gun 18. The inner side of the spray gun seat 15 is formed with an adjustment port 19, and the adjustment block 16 is arranged in the adjustment port 19. The spray gun chassis 17 is connected to the adjustment block 16, and the paint spray gun 18 is connected to the spray gun chassis 17, and the paint spray gun 18 faces the cargo carrying mechanism 5. The position of the spray gun chassis 17 can be adjusted by the adjustment block 16, and then the spraying position of the paint spray gun 18 can be adjusted. The waste collection mechanism 7 includes a paint extraction port 20 and a waste collection box 21, and the opening of the paint extraction port 20 faces the junction of the cargo carrying mechanism 5 and the spraying mechanism 6. The excess paint droplets generated during the spraying process are sucked into the waste collection box 21 by the paint extraction port 20, reducing the pollution of the environment and cans by the excess paint. The traditional technical solution works in a one-time spraying mode, which makes it difficult to take care of every corner of the inner surface of the can and easily causes uneven spraying. The present technical solution is based on a two-time spraying process design, which allows the can body to receive two sprayings on the inner surface (middle mouth wall and middle lower wall) under high-speed rotation. Each spraying is applied to different parts, which can cover a wider area of ​​the inner surface, making the spraying more precise and the coating more uniform, reducing the consumption of paint while ensuring quality; increasing the production speed of cans and reducing the product scrap rate; accurately controlling the consumption of a single can of paint and saving costs; minimizing the pollution of the can body and the environment by excess paint; and realizing rapid conversion in the production of different types of cans to improve production efficiency.

[0047] The technical features of the above-described embodiments may be arbitrarily combined. To make the description concise, not all possible combinations of the technical features in the above-described embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0048] The above-mentioned embodiments only express several implementation methods of the present invention, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the invention patent. It should be pointed out that, for ordinary technicians in this field, several variations and improvements can be made without departing from the concept of the present invention, and these all belong to the protection scope of the present invention. Therefore, the protection scope of the patent of the present invention shall be subject to the attached claims.

Claims

1. A can spraying device, characterized in that: The invention comprises a mounting plate (1), a goods inlet (2), a goods outlet (3), a pre-rotation mechanism (4), a goods carrying mechanism (5), a spraying mechanism (6) and a waste collecting mechanism (7); the goods inlet (2) is arranged obliquely above the pre-rotation mechanism (4), and the goods inlet (2) forms a goods inlet (8); the goods outlet (3) is arranged obliquely below the pre-rotation mechanism (4), and the goods outlet (3) forms a goods outlet (9); The pre-rotation mechanism (4) comprises a transfer plate (10) and a suction cup (11), wherein the transfer plate (10) is connected to the side of the mounting plate (1), and the suction cup (11) is arranged in a ring shape on the transfer plate (10), and a cargo shaft hole (12) is formed at the center of the transfer plate (10); The cargo carrying mechanism (5) comprises a cargo carrying tray (13) and a cargo carrying shaft (14), and the cargo carrying tray (13) is connected to the cargo carrying shaft hole (12) via the cargo carrying shaft (14); The spraying mechanism (6) is arranged on the outside of the cargo carrying mechanism (5), and the spraying mechanism (6) comprises a spray gun seat (15), an adjustment block (16), a spray gun chassis (17) and a paint spray gun (18); an adjustment port (19) is formed on the inner side of the spray gun seat (15), the adjustment block (16) is arranged in the adjustment port (19), the spray gun chassis (17) is connected to the adjustment block (16), the paint spray gun (18) is connected to the spray gun chassis (17), and the paint spray gun (18) faces the cargo carrying mechanism (5); The waste collection mechanism (7) comprises a paint extraction port (20) and a waste collection box (21), and the opening of the paint extraction port (20) faces the junction of the cargo carrying mechanism (5) and the spraying mechanism (6); The cargo intake section (2) is provided with an inlet cargo base (31), a baffle bracket (32), a pressure strip (33), an inlet cargo baffle (34), an inlet brush bracket (35) and a brush body (36); the inlet cargo base (31) is connected to the mounting plate (1), the baffle bracket (32) is connected to the inlet cargo base (31), the pressure strip (33) is connected to the baffle bracket (32), and the inlet cargo baffle (34) is connected to the inlet cargo base (31); a brush shaft is provided between the inlet brush bracket (35) and the inlet cargo baffle (34), one end of the brush shaft is connected to the inlet cargo base (31), and the brush shaft passes through the inlet cargo baffle (34); the inlet brush bracket (35) is connected to the brush shaft, and the brush body (36) is connected to the inlet brush bracket (35), and the brush body (36) faces the cargo tray (13); The delivery section (3) is provided with a fixed plate frame (37), a guide plate (38), a delivery slide frame (39), an exit rotating swing arm (40), a rotating shaft block (41), a movable block (42) and a lever (43); the fixed plate frame (37) is connected to the mounting plate (1), the guide plate (38) is arranged on the outside of the cargo tray (13), the guide plate (38) is connected to the top of the fixed plate frame (37), the delivery slide frame (39) is connected to the mounting plate (1) via an adapter plate, the end of the delivery slide frame (39) is bent to the bottom of the guide plate (38), and the exit rotating swing arm (40) is arranged between the guide plate (38) and the delivery slide frame (39); the rotating shaft block (41) is connected to the fixed plate frame (37), the movable block (42) is connected to the rotating shaft block (41), and the lever (43) is connected to the movable block (42); The spraying mechanism (6) is provided with two groups, and the two groups of spraying mechanisms (6) are located at two adjacent workstations of the cargo tray (13).

2. The can spraying device according to claim 1, characterized in that: The number of the cargo trays (13) is two, and the two cargo trays (13) are connected to the cargo shaft (14) in parallel and at intervals; a cargo carrying opening is formed on the cargo tray (13), and the number of the cargo carrying openings is the same as the number of the suction cups (11).

3. The can spraying device according to claim 1, characterized in that: The waste collection box (21) of the waste collection mechanism (7) is connected to a negative pressure extraction system, and a fan-shaped notch is formed at the open end of the paint extraction port (20), and the edge of the cargo tray (13) passes through the position of the fan-shaped notch.

4. The can spraying device according to claim 1, characterized in that: The rear side of the mounting plate (1) is connected to a main transmission bracket (22); the upper end of the main transmission bracket (22) is provided with a motor base (23); the upper end of the motor base (23) is provided with a pre-rotation motor (24); the pre-rotation motor (24) is connected to a pre-rotation belt (25); the front side of the mounting plate (1) is connected to a guide wheel (26); the pre-rotation belt (25) passes through the guide wheel (26), and the pre-rotation belt (25) bypasses the suction cup (11).

5. The can spraying device according to claim 4, characterized in that: The suction cup (11) comprises a cup body (27) and a cup roller (28); a suction port (29) is formed at the center of the cup body (27); the suction port (29) is connected to the rear side of the mounting plate (1).

6. The can spraying device according to claim 4, characterized in that: The lower end of the main transmission bracket (22) is connected to a main drive motor (30), and a cam divider (44) is provided on the rear side of the mounting plate (1). The main drive motor (30) is connected to the cam divider (44), and the cam divider (44) is connected to the cargo shaft (14) of the cargo tray (13), and the cargo shaft (14) is also connected to the transfer tray (10).

7. A method for spraying inside a can, using the can spraying device according to any one of claims 1 to 6, characterized in that: The cans to be sprayed are sucked by the suction cup (11), and the sucked cans are accelerated to a preset spraying speed. The cans that have reached the preset speed are switched to different stations by the transfer plate (10). During the switching of the stations, the cargo tray (13) carries the cans and performs a position change action and rotates to the spraying station. The cans that have arrived at the spraying stations are sprayed by a plurality of groups of spraying mechanisms (6) preset at the spraying stations.

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