JPH03188963A - Device for coating tubular shell bottom - Google Patents

Abstract

PURPOSE:To efficiently and uniformly coat the inner surface of a tubular shell and the outer surface of its bottom and to produce the tubular shell at a low cost rotating the tubular shell and a positioning roller and injecting a coating material on the dome surface and tapered surface of the tubular shell to coat the bottom. CONSTITUTION:The tubular shell K is intermittently conveyed along a conveyor line from the preceding stage by a tubular shell conveying mechanism 10. The tapered surface of the shell K is abutted on the positioning roller at the tubular shell stop position by a tubular shell energizing means 24, and the shell K is positioned in its axial direction. A driving member 52 abutted on the periphery of the shell K is rotated by a tubular shell rotating mechanism 12, the shell K and positioning roller are rotated on their axes, a coating material is injected toward the dome surface and tapered surface of the shell K by a bottom coating mechanism, and the bottom is efficiently and uniformly coated. Accordingly, since the inner and outer surfaces of the shell is efficiently and uniformly coated, a tubular shell, which is not discolored even if high-temp. treatment is applied, is produced at a low cost.

Description

Detailed Description of the Invention "Industrial Application Field" The present invention relates to a can body bottom coating device for painting the outer surface of the bottom of a bottomed cylindrical can body made of aluminum or the like while rotating the can body. Regarding.

``Prior Art'' In general, aluminum beverage cans are composed of a bottomed cylindrical can body obtained by deep drawing and a can lid that closes the opening of the can body. In order to increase the strength against the internal pressure of the can, the center side is formed into a concave dome surface, and the outer circumference side is formed into a truncated conical tapered surface (
(See Figure 15).

Because of this shape, it is technically difficult to print on the bottom of aluminum can bodies, so until now only the inside and sides were painted, and the outside of the bottom was left unpainted with the exposed aluminum base. It was in good condition and ready for use.

However, when these aluminum beverage cans are heated and sterilized by immersing them in high-temperature water (around 120°C) when filling, the exposed aluminum part on the outside of the bottom oxidizes and turns black, impairing its aesthetic appearance. Until now, the contents that could be filled into aluminum beverage cans were limited to beverages that did not require high-temperature heat treatment, such as carbonated beverages and beer.

Recently, in order to expand the uses of aluminum beverage cans, there has been a growing demand for aluminum beverage cans that are coated with corrosion-resistant coating on the bottom outer surface of the can body and that do not discolor even after heat treatment.

"Problems to be Solved by the Invention" The present invention has been made in view of the above circumstances, and includes:
The object of the present invention is to provide a can body bottom coating device that can efficiently perform coating.

"Means to solve problems".

In order to solve the above problems, the can body bottom coating device of the present invention includes a can body transport mechanism that intermittently transports the can body from the previous process along the transport path, and a can body bottom coating device that moves the can body at a stop position of the can body on the transport path. A positioning roller that comes into contact with the outer peripheral tapered surface of the bottom of the can body and can rotate together with the can body, a can body biasing means that presses the can body against the positioning roller, and a driving member that is attached to the side surface of the can body at the stop position. a can body rotation mechanism that rotates the can body around an axis by rotating the drive member that comes into contact with the can body; and a dome surface on the center side of the bottom of the can body and an outer periphery that are arranged opposite to the bottom of the can body in the stop position. It is characterized by comprising a paint spraying mechanism that sprays paint toward each of the side tapered surfaces.

"Function" In this device, the can body is intermittently transferred from the previous process along the conveyance path by the can body conveyance mechanism, and at the can body stopping position of the conveyance path, the can body is activated by the can body urging means. The tapered surface is brought into contact with a positioning roller to position the can body in the axial direction.

Next, the can body rotation mechanism rotates the driving member that is in contact with the outer peripheral surface of the can body, and while the can body and positioning roller are rotated around the axis, the bottom coating mechanism applies paint toward the dome surface and tapered surface of the can body. To spray paint and efficiently and uniformly paint the bottom.

``Embodiment'' Figures 1 to 3 show a can body coating apparatus incorporating an embodiment of the can body bottom coating apparatus according to the present invention.
The figure is a front view of the whole, FIG. 2 is a side view, and FIG. 3 is a plan view.

First, to explain the outline, reference numeral 1 in the figure is an equipment base 1 that stands upright on the floor, and a conveyance feeder 2 is installed at the upper front of the base 1 to carry can bodies horizontally from a previous process (not shown). ing.

A thick disk-shaped first turntable 4 is disposed at a position facing the terminal end of the conveyance feeder 2, and is fixed to a drive shaft of a rotary actuator (not shown) in the device base 1.
It is intermittently rotated every 45 degrees in the direction of the arrow in the figure. This first
On the outer periphery of the turntable 4, semicircular pockets (not shown) large enough to fit the can bodies K are formed at 45° intervals, and as the turntable rotates intermittently, one can body K is transferred from the conveyance feeder 2 to each pocket. Zutsu-uke is passed.

An inner surface coating mechanism 8 equipped with a spray gun 6 is installed on the side of the first turntable 4, facing the stop position on the can body, and when the first turntable 4 stops, the inner surface coating mechanism 8 is installed in a predetermined pocket. Paint the entire inner surface of a can body.

Further, below the first turntable 4, a second turntable (can body conveyance mechanism) having exactly the same shape is arranged adjacently along the same plane, and synchronized in the opposite direction to the first turntable 4. It is designed to be rotated intermittently. As a result, the can bodies K are sequentially transferred from the pocket of the first turntable 4 to the pocket of the second turntable IO.

A can body rotation mechanism 12 is disposed on the side of the second turntable 10, and rotates the can body K in a pocket at a predetermined position around an axis when the second turntable 10 is stopped. Further, a bottom coating mechanism 14 is provided on the bottom outer surface of the can body in this stop position, and sprays paint onto the bottom outer surface of the can body rotated by the can body rotation mechanism 12. The second turntable 10 is installed on the can body whose bottom outer surface has been painted.
As the material rotates, the material is sequentially delivered to the next process (not shown) along the delivery guide 16.

Next, the main parts of the present invention will be explained in detail.

First, the can body rotation mechanism 12 will be explained. As shown in FIGS. 4 and 5, a mounting plate 18 is fixed upright to the device base I on the side of the second turntable IO. A pair of side guide plates 20 extending in a semicircular arc shape along are fixed parallel to each other. These side guide plates 2o are connected to the unloading guide 16 from the introduction position P1 adjacent to the first turntable 4.
It has a length that reaches the discharge position P4, and presses the sides of the can body to prevent it from falling out of the pocket.

The mounting plate 18 also has a second turntable lO located closer to the second turntable 10 than the side guide plate 2o and on the front side (this side in FIG. 4) of the open end of the can body in the pocket. An arc-shaped nozzle mounting plate 2 extending along the outer periphery of the
2 is fixed parallel to the outer periphery of the second turntable 10.

An air injection nozzle (can barrel biasing means) 24 is vertically penetrated and fixed to each of the starting end, center, and terminal end of the nozzle mounting plate 22 toward the outer peripheral edge of the second turntable 10. The tips of these air injection nozzles 24 are fixed through a tip fixing plate 26 arranged parallel to the nozzle mounting plate 22.

All the air injection nozzles 24 are connected to an air supply device (not shown) and are configured to constantly blow out hot air.

On the other hand, on the back side of the second turntable IO, a short arc-shaped bottom guide plate 28 is provided at a position facing the bottom of the can body in the pocket at position P2.
0 and is fixed to the device base l via a spacer 30 (see FIG. 6). This bottom guide plate 28 comes into contact with the bottom of the can body in the pocket at position P2, and positions the can body in the axial direction. However, the painting position P
It hasn't even reached 3.

As shown in FIGS. 6 and 7, an arm mounting plate is further fixed to the bottom guide plate 28 through a long hole 32 and a screw, and its position can be changed along the outer periphery of the second turntable IO. ing. An arm 38 is rotatably attached to the arm mounting plate 34 by an adjustment screw 36, and a positioning roller 40 is rotatably attached to the tip of the arm 38 toward the second turntable IO. The positioning roller 40 has a hemispherical shape, and as shown in FIG. 6, comes into contact with the outer periphery of the tapered surface KA of the can body in the pocket at the coating position P3, thereby positioning the can body in the axial direction.

A pair of pulley mounting members 42 are also fixed to the mounting plate 18, as shown in FIGS. A spin shaft 46 is supported rotatably in parallel with. As shown in FIG. 9, a double pulley 48 and a spin pulley 50 are fixed to the tip of the spin shaft 46 on the second side with an interval between them, while the tip of the spin shaft 46 on the lower side is also fixed to the tip of the spin shaft 46 on the lower side. A pair of spin pulleys 50 spaced apart
is fixed.

A spin belt (driving member) 52 made of rubber or the like is wound between the facing pulleys 48 and 50, and the outer peripheral surfaces of these spin belts 52 are as shown in FIG. It is elastically in contact with the outer peripheral surface of the can body in the pocket at the coating position P3. The contact pressure of each spin belt 52 on the can body is set within a range that does not cause the risk of denting the outer circumferential surface of the can body or causing the can body K to idle.

As shown in FIG. 9, a rotation detection plate 54 having a partial notch 54A on the outer periphery is fixed to the lower spin shaft 46 within the pulley mounting member 42, and is opposed to the outer circumference of the rotation detection plate 54. The proximity sensor 56 is fixed. The rotational speed of the spin pulley 50 can be detected from a change in the output signal of the proximity sensor 56.

On the other hand, on the side of the mounting plate I8, as shown in FIG. 8, another mounting plate 58 is fixed to the device base 1, and this mounting plate 58 has a pulley shaft 60 as shown in FIG. and a pulley shaft 62 are mounted parallel to the spin shaft 46 via bearings 64, 66, respectively.

A pulley 68 is fixed to the upper pulley shaft 60, and a pair of pulleys 70 are fixed to the pulley shaft 62.
A timing belt 72 is wound between the pulleys 68 and 70, and a timing belt 74 is also wound between the pulley 70 and the double pulley 48. Further, a press roller 76 for applying tension to the timing belt 74 is rotatably attached to the mounting plate 58 via a roller shaft 78.

The pulley shaft 60 extends close to the device base 1 and is supported by a bearing 80, and a pulley 82 is fixed to the tip thereof. On the other hand, a motor 84 is fixed inside the device base 1, and a timing belt 88 is wound between a pulley 86 fixed to the rotating shaft of the motor 84 and the pulley 82.

A slide plate 90 is also fixed to the device base I''2 in a direction perpendicular to the timing belt 88, as shown in FIG. 92 is attached so that its position can be adjusted.

Next, the bottom coating mechanism 14 will be explained. As shown in FIG. 11, a pair of slide rails 94 are fixed in parallel in the vertical direction on the back side of the second turntable 10 on the device base l, and a moving table 96 is installed between these slide rails 94. It is slidably attached along a slide rail 94.

As shown in FIGS. 12 and 13, a fixed knob 98 is vertically attached to the movable table 96 so as to be movable in the pulling direction, and the tip of the fixed knob 98 penetrates the movable table 96 and protrudes to the back side. There is.

On the other hand, a fixing plate 100 is attached between the slide rails 94, and the tip of the fixing knob 98 is attached to the fixing plate 100 at a position where the moving table 96 is raised by 1" and at a position where it is lowered. A penetrable hole +02 is formed. As a result, by pulling out the fixed knob 98, the movable base 96 can be raised and lowered, and when painting the bottom outer surface of the can body, the movable base 96 is fixed in the raised position, and when it is not necessary to paint, the movable base 96 is fixed in the lowered position. I can do it.

At one end of the moving platform 96, there is a plate I04 with a dogleg shape.
is fixed, and two shaft supports 1 are fixed to this mounting plate 104.
06,108 through each one gun shaft +10 11
2 is attached so that its position can be adjusted vertically. One shaft support lO8 is shown in FIGS. 15 and 1.
As shown in FIG. 6, an angle changing knob 114 is provided, and by pulling this out, the angle of the gun shaft 1121 can be changed.

Each of the gun shafts 110 and 112 has an L
A letter-shaped support plate +16 is fixed, and these support plates 1
Mounting plates 118 are rotatably fixed to the upper ends of the mounting plates 16 with bolts, and the elongated holes 12 formed in these mounting plates 118
The spray guns 122124 are each fixed by bolts passing through the holes so that their positions can be adjusted.

One spray gun 122 has its injection nozzle 122A.
is fixed at a predetermined interval toward the center part KB of the dome surface of the can body in the pocket at the painting position P3.

Further, the other spray gun 124 has an injection nozzle 124.
A is fixed so as to face perpendicularly to the tapered surface KA of the same can body, and when the angle change knob 114 is operated, the first
As shown in Figure 5, the direction is changed depending on the diameter of the can body to be coated (11 openings in the figure). And these spray guns 122. +24 are respectively connected to an air supply device and a paint tank (both not shown).

Next, in order to use the coating apparatus having the above configuration, 2. First, the can bodies K supplied from the previous process and whose side surfaces have already been coated are sequentially fed into the pockets of the first turntable 4 through the conveyance feeder 2, and then 1. The turntable 4 is rotated and transferred to a position facing the spray gun 6 of the inner surface coating mechanism 8.

Next, the spray gun 6 is activated to paint the entire inner surface of the can body K while rotating it in the pocket, and the first turntable 4 is further rotated to bring the second turntable IO into the introduction position P1 at its lower end position. Send it into the pocket in the.

The second turntable IO rotates intermittently in synchronization with the first turntable 4, and when the can body moves from Pl to P2, no air is sprayed from the air injection nozzle 24 and the inner coating film is dried by the hot air. At the same time, it is pushed backward in the pocket, and its bottom outer surface hits the bottom guide plate 28 and the first
Step positioning is performed.

Further, when the second turntable 10 rotates and the can body moves to the coating position P3, the positioning roller 40 moves to the tapered surface KA.
At the same time, the two spin belts 52 elastically abut against the sides of the can body.

In this state, the motor 84 is operated to rotate each spin pulley, and while the can body K is rotated at high speed by the spin belt 52, each spray gun 122, 124 is operated, and each spray nozzle + 22A, I 24A is connected to the can body. dome surface K
Spray paint uniformly onto each of B and tapered surface KA to perform painting.

At this time, the positioning roller 4° is in contact with the tapered surface KA, but since it is a point contact and a slight coating film is formed on the tapered surface KA during side painting, there are no negative effects such as unpainted parts. do not have. Furthermore, during painting, the rotation speed of the rotation detection plate 54 fixed to the spin shaft 46 is checked using the proximity sensor 56, and when the rotation speed reaches a predetermined speed, the motor 84 and spray gun 122, 124 are stopped, and the coating conditions are met. Aim for unification.

The can body, which has been painted on the inside and outside of the bottom, is
It is discharged from the second turntable IO at the discharge position P/I, sent to the next drying process along the discharge guide 16, and dried with hot air.

According to the second apparatus, the inner surface of the can body and the outer surface of the bottom can be efficiently and evenly coated, and the can body K can be coated without discoloration even when subjected to high temperature treatment. It is possible to produce at low cost.

In addition, in this device, the tapered surface KA of the can body is aligned with the positioning roller 40 by hot air jetted from the air jet nozzle 24.
Since it is configured to press against the can body and position it in the axial direction on the can body, it does not come into contact with the inner surface of the can body where the paint is not yet dry, or the casome part at the top end, which may damage the paint film in these areas. There is no fear.

In addition, since the inner surface is coated on the first turntable 4 and the bottom is continuously coated on the second turntable IO, it is only necessary to dry the inner surface and the outer surface of the bottom at the same time in the next process. It is possible to reduce costs by eliminating the need for twice-drying, and it is also possible to shorten the time required for drying, which also improves productivity.

Furthermore, in this device, two spin belts 525 are elastically brought into contact with the sides of the can body, and by rotating these spin belts 52, the can body K is rotationally driven. Compared to a configuration in which the can body rotates, the contact area with the can body can be increased, and even if the contact pressure is small, there is no risk of idling, and a driving force of 1 minute can be obtained. There is no risk of deformation such as denting of the sides.

Note that the present invention is not limited to the above embodiments, and the configuration may be changed as necessary. For example, instead of using a spin belt as a driving member, one or more rubber rollers may be placed in contact with the side surface of the can body, and the rubber rollers may be rotated to rotate the can body, or the positioning rollers may be used as the positioning rollers on the can body. Instead of being driven to rotate as it rotates, it may be configured to be driven to rotate more actively.

Further, as the can body conveyance mechanism, it is possible to implement not only the turntable 10 but also a structure in which the can body is conveyed between a large number of aligned rollers.

Furthermore, the inner surface coating mechanism 6 is connected to the bottom coating device of the can body. They may be separated and made into separate bodies.

Further, the apparatus of the present invention is not limited to aluminum can bodies, but can be applied to can bodies made of any material as long as they do not have a similar shape.

"Effects of the Invention" As explained above, according to the can body bottom coating apparatus according to the present invention, the can body is intermittently transferred from the previous process by the can body conveyance mechanism along the conveyance path, and the can body is At a stop position of the can body on the road, the tapered surface of the can body is brought into contact with the positioning roller by the can body biasing means, and the can body is positioned in the axial direction.

Next, the can body rotation mechanism rotates the driving member that is in contact with the outer peripheral surface of the can body, and while the can body and positioning roller are rotated around the axis, the bottom coating mechanism applies paint toward the dome surface and tapered surface of the can body. To spray paint and efficiently and uniformly paint the bottom.

Therefore, with this device, it is possible to efficiently and evenly coat the inner surface and the outer surface of the bottom of the can body, and to produce can bodies that do not discolor even when subjected to high-temperature treatment at a low cost. It is possible to produce.

In addition, this device is configured to position the can body in the axial direction by pressing the tapered surface of the can body against the positioning roller, so there is no need to contact the inner surface or upper end of the can body, and the coating film on these areas There is no risk of damage to the therefore,
This method has the advantage that it is possible to treat can bodies that are still undried after the inner surface has been coated.

[Brief explanation of drawings]

1 to 3 show a can body inner surface and bottom coating device incorporating an embodiment of the can body bottom coating device according to the present invention, FIG. 1 is an overall front view, and FIG. 2 is a The right side view and FIG. 3 are plan views. 4 to 16 show the main parts of the device, FIG. 4 is a front view of the conveyance mechanism, and FIG. 5 is a fixed view taken along the line ■-■ in FIG. 8 is a front view of the can body rotation mechanism, FIG. 9 is a side sectional view of the can body rotation mechanism, and FIG. 10 is a side view of the can body rotation mechanism. , Fig. 11 is a front view of the bottom painting mechanism, Fig. 12 is a right side view of the bottom painting mechanism, Fig. 13 is a sectional view taken along the xrn-xm line in Fig. 12, and Fig. 14 is a right side view of the bottom painting mechanism. , FIG. 15 is a side view showing the mounting structure of the spray gun, and FIG. 16 is a view taken along the line XVIxvr in FIG. 15. K...Can body, KA...Tapered surface, KB...Dome surface, ■ - Equipment base, 2... Conveyance feeder,
4...1st turntable, 6.spray gun, 8.
...Inner surface coating mechanism (pre-process), 10...Second turntable (can body conveyance mechanism), 12
... Can body rotation mechanism, I4... Bottom painting mechanism, 16...
・Export guide, 20... Side guide plate (forms a conveyance path), 24・
Air jet nozzle (can body (=ll flat means, 40...positioning roller, 52...spin belt (drive member) 122.124...spray gun, Pl...introduction position, P3...painting position , P4
...Ejection position.

Claims (1)

[Claims] A can body transport mechanism that intermittently transports can bodies from a previous process along a conveyance path; and a positioning mechanism that can rotate together with the can body by abutting against an outer peripheral tapered surface of the bottom of the can body at a stop position of the can body on the conveyance path. a roller, a can barrel biasing means for pressing the can barrel against the positioning roller, and a driving member that contacts the side surface of the can barrel at the stop position and rotates the driving member to rotate the can barrel around an axis. It includes a can body rotation mechanism, and a paint injection mechanism that is disposed opposite to the bottom of the can body in the stopped position and injects paint toward each of the central dome surface and the outer circumferential tapered surface of the bottom of the can body. A can body bottom coating device that is characterized by: