JPS58196869A - Barrel of cylindrical container, method and apparatus for producing same - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for applying powder to the body of a cylindrical container and to an apparatus for applying powder, both within the scope of the patent application.

Covering the welded longitudinal seams of cylindrical containers filled with sensitive materials with electrostatically charged powder is known and is primarily applied to cylindrical numberers. The powders often used are polymeric resins, such as epoxies or polyethylenes, which are carried as a fine solution in the air stream to the weld seam and impart an electrostatic charge just before reaching the seam. It will be done.

On leaving the conveying stream leading to the powder, the powder is distributed over a wider area than in the seam. In this way, parts of the cylindrical container that do not have to be traversed are also covered, and on the other hand, on the weld seams, which often have sharp edges, it is ensured that too little powder is deposited and is completely covered. Something happens that cannot be done.

United States Patent No. 3,113,862
According to ), one method is known, according to the Mukuro method, using a tape that covers the lateral areas of the seam,
A constant nine narrow, uniform streaks of powder are applied to the surface of the seam Km.

It is not possible to laminate the inside of the seam using the method described above. This is because the fine tape with the slits is not introduced into the interior of the welded, ie closed, cylindrical container. Furthermore, it is pointless to apply the powder uniformly over the entire area to be treated. Once enough powder has been applied to completely cover the edges of the seam, there will be excess material in the lateral areas, which can be difficult to avoid when the powder price is high. be. When the thickness of kneading is thin, defects arise in the joints.

German Patent Publication No. 2933641 describes a device for sprinkling powder. This is partially prevented by separation, where the powder is separated from the air before reaching the seam by a centrifugal separator, for example by an inverted loop in the conveying conduit, and is then transported to the seam. The flow of air entering the injection space parallel to the flow of powder is There, it inevitably remixes with the powder and forms a powder/air cloud.This device ensures that the powder is dispersed less in the periphery and is not smeared thickly in the center. It is impossible to have a constant distribution in the lateral direction.

In the above-mentioned application of the content described in German Patent Application No. 1.2943641 (European Patent Application No. 54) No. 57), the injection space is made of a porous material. Gas or air is blown through this porous material into the injection space, thus allowing the powder to be sprayed into the seam approximately parallel to the II tangent seam. Confined coating, which involves only very narrow areas of the seam, is not possible with such equipment. This inevitably results in wasted powder.

Switzerland! P! According to No. 60312-9 Specification 1pC, a jetting head of a powder smearing device is known, which comprises a number of jetting heads located in a direction opposite to the direction of flow of the powder/air mixture. A bar and guide board are provided. The rods and plates brake the powder/air flow and redirect the flow toward the injection slits, which are bounded by lateral, flexible edges. As another means of redirection, a guide plate is provided at a position crossing the slit. Helped again.

Using different shaping techniques to dampen and redirect the air/powder mixture results in the formation of an ejecting head with a non-swampy, complex and discontinuous tendency. The distribution of powder achieved by the guide and control rods is subject to a large charge cost of powder and air, a large part of which has to be removed by suction and charged again. In addition to the high costs for the pair of air and suction air, there are additional costs for recharging and the loss of part of the powder during this process.

All known powder smearing devices directly or indirectly form a powder/air cloud inside the injection space, and this is due to the fact that an electrostatic %L is generated inside the injection space. And because of this charge, it is guided not by force or force but by the high pressure and air flow inside the injection space to the joints that are guided around the injection space. Even though an efficient suction cap is located above the injection space, a large amount of powder still adheres to the outside of the cylindrical object. Most of the powder delivered to the injection space will be aspirated and must be cleaned for reuse.

The aim of the invention is to create a device that eliminates the drawbacks of known devices.

In particular, the problem of the invention is that the central part, which is the one point of the seam, is completely covered with a thick layer, whereas the parts located at the edges are only covered with the necessary root plates.

Another problem with the present invention is that the powder carried in the air stream is carried to the surface of the VC seam along with the small amount of air it carries.

Another advantage of the invention is that the device can be placed as close as possible to the welding machine.

According to the present invention, these Kan Ta1i! p! The problem is solved by the characteristic method and device described in the scope of *.

Other specific embodiments of the invention are described in the embodiment section.

By dividing the powder/air flow into several zones in the jet nozzle that can have different applications, a small amount of lid powder completely traverses the weak point in the center of the vertical grain. or 1=] to the north.

Another feature of the invention is that by dividing the powder/air flLn into several conduits, the growth of the individual parts f=i
It is impossible to change one's pureness.

Another feature of the invention is that, because the powder supply conduit is dedicated to the vicinity of the weld seam, the work is done with less air volume and less pressure and therefore less excess powder preparation is required. There are fewer lids where powder particles are thrown out next to the seam area. , To the east, thicken the powder to the seam ~
It is possible to smear it without giving static t'#.

Another feature of the invention is that the thickness of the powder layer in the direction across the seam is well adjustable due to the arrangement of the two supply conduits located side by side.

Another feature of the invention is that due to the helical guidance of the conduit, no occlusions occur.

Another aspect of the invention is that a drop tube near the outlet allows for easy removal of excess powder from the application area. This powder, t, is not defiled, and does not need to be purified.

Another feature of the invention is that the powder-/
It is possible to divide the nitrogen flow without interference.

Another % value of the present invention is that due to the small dimensions of the device of the present invention, it is difficult to install it directly on the bath welding machine, and that the distance from the welding position to the device of the present invention is Due to the short length of the adhesive, it is important to position the seam in the correct position relative to the jetting head, which makes it easier to place the seam in the hot seam of powder or bath welding. J
Carefully apply and smear accurately over the seam.

Another feature of the invention is that by selectively heating the seam area or by heating the seam area for a period of time, the debris of the powdered wood has a slight electric charge or no electricity. 'J' b: is two. In many cases, the triboelectric charge of the /C7σ end generated in the donor superconductor is already sufficient to adhere to the hot Il eye.

The invention will now be described in detail by way of example illustrated in the accompanying drawings.

, the selection of the powder, the selection of Al1 as well as the melting of the powder into a uniform layer on the seam are not the subject of this book, so this is not necessary for understanding the invention.
It is written at i degree.

Figure 1 shows a schematic representation of Kinichi's seam welding machine 1, electrode rollers 2, 3, several freshly welded cylindrical containers 4, a powder coating device 5 with a jetting head 6, an outer Suction device 117 and selection and reselection device combination 8M
and a known heating device 9 for melting powder on the seam.
is shown with. The electrical device that generates the electrical voltage for imparting electrical power to the powder is shown symbolically and labeled with the symbol IO.

The jet head 6 is shown as an enlarged longitudinal section in the spear 2-. In the second case, a cylindrical shape 414 located above the injection head 6 is shown, and the cough 1! The device is injection head 6
Pass from left to right (arrow m). In the cutting direction 11 Fi above the cylindrical receptacle, it passes directly through the weld seam 12 of the container 4 and is located above the injection port 13 . Four conduits 15 for the powder/air mixture are led into the space 14 in a position inclined relative to the horizontal plane. A further conduit 16 of large cross section is connected to the head space 17 at the end of the injection head 6 . Conduit 16 is connected to a suction device leading to selection device fl18.

The conduits 15 originate from inside a five-cone ring 18 in which the powder/air mixture is divided into conduits 15 from the main body 19, with more than two conduits 15 being provided.

A needle-shaped electrode 20 can protrude into the conical ring-shaped space 1B. These 11 poles are located 118 times with respect to the conduit 15 exiting this space 18. These electrodes are connected to a high voltage source W via a ring-shaped copper t-pole 21 and a conductor ljM22.

The diameter K of the cylindrical container does not allow all the conduits 15 to be guided in the lower half of the injection head 6 so that they are located parallel to each other.

If the diameter of the cylindrical container is 65111 or less, the conduit 1
As shown in Figure 5F'i, it is guided spirally from the conical ring-shaped space.

The side of the injection port 13Fi has a backing material like a rubber edge or a brush edge. These particles serve to attach and demarcate the ejected powder to the surface of the cylindrical object.

The upper part of the leading space 17 is closed at ti[24 with respect to the cylinder number.

The plan view shown in FIG. 3 shows that the jet orifice 13 has two areas 25 and 26 of different width inside the jet head 6.

When viewed in the moving direction (arrow M) of the cylindrical container number, the width 26 of the intrusion bar is narrower than the width 26 of the exit bar.

On the entry side of the spear 3, a cylinder number is shown that enters above the injection head 6. The brightly meshed area in the center indicates the weld seam 12. Adjacent to it are two unlacquered spare parts, and on the outside there is a cylindrical iron plate 28 which is already flat and covered with RCM.

From this figure, weld seam 12 and! 1, it is likewise clear that the portion 27 to be covered as well as the approximate width proportions of the areas 1a5 and 26 of the slit of the injection orifice 13 are clearly visible. Slightly wider than the narrow area 25f joint 112, wider area! The overall rlJ of the 26U seam 12 and the allowance 27 is exceeded.

In another formation of the injection port 13 (Fig. 51-4), the injection port 13
The diameter of the ejection head 6 increases continuously from the end on the entry side to the end on the exit side. However, the supply of powder/air mixture eyelids can be achieved through several conduits 1, as shown in fangs 2 and 1.
t+, which is distributed equally to 5.

It is clear that instead of the four conduits 15 shown by way of example, it is also possible to use fewer or more conduits.

In another embodiment of the invention, the four tubes 115#'i which conduct the flow of powder/air are provided with approximately cylindrical surfaces or Fi, the joints 12f (as opposed to the blood and flesh which are directed and very little against these surfaces). The distance between the end of the conduit and the weld seam 12 is in the range from 2 to 51 J, in particular at a distance of about 2.
It's now 51.

The open cut at the end of the conduit 115 can be rounded or angular. In front of the conduit 115Fi, it is also possible to have a double structure and to be located in close contact with each other, especially in the wide part 26 of the injection port 13. 4I, the conduit 115 is fitted with a pluggable and easily replaceable terminal piece 315. Another conduit 116 is provided at the front of each conduit 115 for #1 of the suction conduits 16 connected into the leading space 17 .

These conduits 116 are connected to the bottom of the funnel-shaped recess 11), which lies between the powder conduits 60. The suction conduit 116 is connected to a suitable VCC through the suction conduit 16 (see Figures 5/6).

On the side of the spout 13 there is a backing element 23 or string of synthetic material running along the backing element 23, which holds the part near the seam 12 in place because it is made of powder particles. spear 5
In the dormitory embodiment shown in 6th grade, the particles 61 as described above are left to cool. In particular, the conduit 116 is electrically disposed close to the welding groove 12 and as a result, the powder-/
The air flow is also abandoned if it is allowed to flow out with too little velocity to overcome the remaining free path reaching the seam 12.

Particles that do not reach the joint or particles that dissociate again are passed through the conduit 11.
6 immediately prevents it from being removed from the spout.

In the formation of the jet head 6 with only two conduits 15.1115, it is clear that the division of the powder/air flow at the end of the supply conduit 19 takes place via a Y-shaped division of the conduit 19. be. In this special electric line 1, 20 is particularly present in the Y branch. 1. .

The formation of a powder stream exiting the conduits 15, 115 is critical to the application of the powder, where most of the conveying air flows parallel to the powder stream.

The cross sections shown in Figures 8, 9 and 10 are of conduit 15.1.
15, these conduits cause the powder to flow out in a band-like stream at right angles or at least at an obtuse angle to the seam. The initially round cross-section of the powder conduit 15° 115 begins to become square in cross-section from the curved part below the nozzle and continues to the nozzle in the horizontal part of the conduit 15, 115, where air is Powder particles swinging in the flow are distributed on a flat outer radius and slide upward at that location,
There, the particles are injected from conduit 15.115 as a narrow strip spread across the seam from a welding machinist to a cylindrical shape Wi number with a longitudinal seam welded between ms crawler and 30. It is carried by the transport system 29 and arrives at the powder coating device 6 . First, from the narrow area 25 of the injection head 13, narrow 1. , the powder coating is applied just to seam 12 only. Wide area 26f:'
During the fourth pass, the powder is applied over an area that includes only the seam 12 and also includes the portion 27 that is in instant contact.

This action further coats the already drained portions of the seam 12 with powder.

The application of the powder to the cylinder 4 is achieved in a known manner by imparting an electrostatic charge to the powder particles at the electrode 20 or by friction with the supply conduit 1δ, which one cylinder 4 has an opposite charge or adhesion of the powder is done by sticking to the seam 12 which is still hot after welding or kept hot by a heat source (not shown) and whose temperature exceeds the melting temperature of the powder.

The supply of the powder to the air stream takes place by conduit 19. Conduit 190 is divided into several conduits 15 at the end of the conical ring-shaped space 18 or Y-shape and is charged with an electrostatic charge of 1! With him (powder/air stream) loaded with powder/air stream, the powder/air stream passes through the slit 13' without using any tricks.
ft directly into the seams 12 and 2f.

The powder applied by the backing [123] is precisely confined to the width of the slit. 1 yen! i) the powder particles not adhering to the cylinders 4 and the conveying air are removed via the suction conduit 16), the powder particles between the succeeding cylinders 4 are removed by means of the suction device 2 via the head space 17 and/or the funnel-shaped recess; ,
It is then sent again to the selection device. After the powder has been applied via the injection head 6, the m-shaped container is sent along a heat source or heating device 1119, thus melting the powder Fi and adhering well to the mating surface of the seam IR. A free-flowing target is formed.

It is clear that the methods and devices described above for covering internal seams apply equally well for crossing external seams. It is also clear that the method described above can also be applied in the case of lower seams.

[Brief explanation of the drawing]

Figure 1 is a schematic diagram of the powder applicator for a longitudinal seam welding machine for cylindrical containers, Figure 2 is a vertical sectional view of the injection device, and Figure 3/4 is a plan view of the injection device shown in Figure 2-. , Figure 5 is a vertical view of another embodiment of the injection device, and Figure 6 is a horizontal view of the injection device shown in Figure 5. 8.9 The garden is in the 5th ward of ■-■
Fig. 10 shows a cross-section of the conduit along the edge, line 1--, x-tlii, and Fig. 10 shows a plan view of the injector. - in 2.3
... Welding roller, 6... Jetting head, 12-...
Welding joint, 13... Injection port, 15, 115... Conduit, lma... Top space, 18... Conical ring-shaped space,
23... Backing feature, 25.26... Area, 2
F...Full grade part, 215...Opening/closing lid.

Claims (1)

[Scope of Claims] l) A cylindrical container having a welded longitudinal seam and a retention layer formed at the seam by melting or melting the applied powder together with an air flow, A cylindrical container, characterized in that the protective layer is also essentially * in the vicinity of the bulge forming the weld seam (12) as well as in the edge area (27). 2) Melting cylindrical containers! ! A method for manufacturing a cylindrical container according to claim 1, in which the seam is coated with a layer of powder, in which the powder is applied as two or more layers that are at least partially one to the other. How to remove mold immediately afterward. 3) A method based on Item 2 of Item 2 of Request for Part 11, characterized in that the width of the subsequently applied layer is increased/decreased. 4) A cylindrical container in which the powder is carried by a stream of air and carried to the slit-like orifice of the injection head located opposite the weld seam and from there conveyed past the orifice by a conveying device. A layer of powder is smeared onto the surface of the cylindrical vessel at the joint, and the powder is introduced in the vicinity of the weld seam (12) through the conduit (15, 115) K in the stone method. A method characterized in that it is then applied to the weld seam at an obtuse angle. 5) The end of claim 4 is characterized in that the end 8 is guided approximately at right angles to the weld seam (12) and is applied to the weld seam (12) from a distance of 2 to S WS.
The method described in section. 6) The powder is applied in the vicinity of the hot spot of the welding roller (L3) when the temperature of the welding seam (12) is higher than the melting temperature of the powder. A method according to claim 4 or 5. 7) The humidity of the weld seam (12) and the area in its vicinity (2)) must be heated by a heat source to a temperature above the melting temperature of the powder, or above the melting temperature plate temperature. ,
%¥+Performance request range 4tfI- is the method described in Section 5. 8) Powder-laden air between the guides (15, 115) and/or in the head space (1)) as well as any excess powder not adhering to the rowing joints is suctioned out. Range ~, 5? The method described in item 4 or 5. 9) An injection head having a slit-shaped injection port that distributes the powder carried by the air flow within the range of the i-joint, and a transport device that transports the container along the injection port! In the apparatus for manufacturing a cylindrical container according to claim 1, the powder is applied to a longitudinal welded joint H of a cylindrical shape having a jet orifice (13) with a band-shaped layer of powder. The slit-shaped injection opening (13) of the injection head (6) is guided by the conduits (15, 115) connected to the injection head (6). The conduit (15,
115) to 9II powder is welded! A device characterized in that it acts on the eye without using an obtuse tube. 10) A closing lid (215) is attached to the conduit (16),
10. The device of claim 9, wherein the capsular bag is adjustable to adjust the amount of powder. 11) The conduit (115) should be connected to the injection port (13) K so as to be approximately perpendicular to the fi-weld joint, and the conduit (115) should be connected at a distance of 2 to 6 m from the welded joint (1g). 20. Device according to claim 19, characterized in that it ends in a distance. 12) When viewed in the transport direction of the cylindrical container, a large number of guide vrs (15, 11b) arranged in a row have injection ports (13
), the device according to claim 9, characterized in that the device is connected within a. 13 N spout/(13 elbow narrow area (25) and seven Kkk
(The greasing described in Section 12 of Patent WIII, characterized in that it consists of a wide area (26). 14) The connection cross section of the conduit in the narrow area (25) is ) is smaller than that of claim i13. 15) In the wide area (26), two conduits (115) are adjacent to the injection port (13)! 14. The device according to claim 13, characterized in that the device is made of one wire. 16) The device according to claim 12, characterized in that the conduit (15) is guided into the injection port (13) in a spiral manner. 17) Device according to claim 1, characterized in that the powder is given an electrostatic charge in a conical ring-shaped space (18) before entering the conduit (15, 115). 18) The adhesion of powder is restricted by a loop string located on the side of the injection port (13) and circulating in the transport direction. 9~l
The device according to any one of Items F. 19) Patent thl!, characterized in that on the side of the l* outlet (13), a backing element (23), such as a rubber brush edge, is provided. Ice range fangs 9-17
Equipped as described in the section ``Killing''.