WO2012159722A1

WO2012159722A1 - Method and device for painting gas cylinders for cylinder packs

Info

Publication number: WO2012159722A1
Application number: PCT/EP2012/002125
Authority: WO
Inventors: Erwin Hihn; Werner Swoboda
Original assignee: Eisenmann Ag
Priority date: 2011-05-21
Filing date: 2012-05-17
Publication date: 2012-11-29
Also published as: DE102011102191B4; DE102011102191A1

Abstract

The invention relates to a method and a device (10) for painting gas cylinders (1) for cylinder packs. Said gas cylinders are first pretreated with a liquid treatment medium, and then dried by largely local inductive heating of the shoulder flange (5) which has been shrunk on the neck (4) of the gas cylinder (1), and of the adjacent area of the shoulder (2). As a result, a liquid medium, which is located in the hollow space (8) enclosed by the shoulder collar (5), is expelled reliably, in an energy saving manner and in a short time, so that the paint applied subsequently does not peel off during the course of later use of the gas cylinder (1) in the area of the transition between the shoulder collar (5) and the shoulder (2), and no corrosion can take place in said area.

Description

Method and plant for painting

Block gas cylinders

The invention relates to a method for painting block gas bottles according to the preamble of claim 1 and to a system for painting block gas bottles according to the preamble of claim 2.

Block gas cylinders generally have a construction in which a shoulder collar is shrunk onto the neck, which has a smaller diameter than the main area, which in turn carries an external thread for a bottle cap. The shoulder collar surrounds a cavity, of which, a

Part of the shoulder and neck is limited. Block gas cylinders must undergo pretreatment before the painting process, using liquid treatment media. These pretreatments include, in particular, degreasing and optionally Zn-phosphating. These pretreatments can be carried out both by a dipping process and by high-pressure spraying.

All these pretreatment processes have in common that liquid treatment medium can penetrate into said cavity, in particular if different bath temperatures are used. In such a case, the block gas bottle is painted and

while the gap between shoulder collar and shoulder initially closed and evaporated in the course of

If the liquid treatment medium is used, it will cause the paint to flake off or rust in the neck area

CONFIRMATION COPY the block gas cylinder over time. Block gas cylinders are to verhin this ^¬ countries heated by direct gas-fired convection oven with known methods and devices of the type mentioned. This heating takes place untargeted over the entire volume of the block gas cylinder. For the subsequent painting, for example with powder coating, the entire block gas cylinder must be cooled down accordingly. Object of the present invention is to provide a method and a system of the type mentioned, with the or with a lower energy consumption and faster the entire painting process can be abgegewik-.

This object is achieved, as far as the method is concerned, in that the step f) of drying comprises a local inductive heating of the shoulder collar and of the region of the shoulder adjoining it.

According to the invention is therefore no longer the entire

Block gas cylinder brought to the temperature required for expelling the liquid treatment medium; Rather, the heating is limited locally to the region in which liquid treatment medium preferably accumulates, namely on the shoulder collar and the adjacent region of the body

Shoulder. According to the invention, this local limitation can be realized particularly favorably by inductive heating. In experiments, it was found that, for example, 30 seconds are sufficient to reach local temperatures of over 120 ° C. This ensures rapid and complete vaporization of the liquid treatment medium in the cavity. The above object is, as far as the plant is concerned, solved by e) the drying station comprises an inductor, the

is powered by a power supply and a

Has effective range, the shape of the shape of the

Shoulder collar and adjacent area

the shoulder is adapted such that the inductor can be brought into a position in

which has its effective range a suitable for inductive heating small distance from the shoulder collar and adjacent to this region of the shoulder. The advantages of the system according to the invention correspond mutatis mutandis to the above-mentioned advantages of the method according to the invention.

In an advantageous embodiment of the invention, the inductor is held by a holding device, which is designed so that the effective range of the inductor with a relative to the axis of the shoulder collar axially directed component of motion on the

Block gas bottle can be placed. To this

In the drying station, the inductor and the block gas cylinder can be largely automatically brought into the relative position required for drying.

Positioning in the axial direction is required because of the special shape of the block gas cylinder in the area of the shoulder and the shoulder, in order to prevent the

inductive heating required small distance

to realize.

It may also be expedient if the inductor of

a holding device is held, the so formed det is that the effective range of the inductor can be placed with a relative to the axis of the shoulder collar radially directed component of movement on the block gas cylinder, to which the effective range of the inductor has a lateral gap. A movement of the inductor in the lateral direction on the

Bottle allows to position the effective range of the inductor axially aligned above the block gas cylinder, even if it is suspended by a support rod or a rope. The support rod or rope then penetrates through the gap in the lateral movement

the effective range of the inductor. Subsequently, then the axial movement of the active area, which in the vicinity of the shoulder collar and the shoulder of the

Block gas bottle brings.

A particularly favorable embodiment of the invention is characterized in that the holding device comprises a pivoting frame, which at its lower

End via at least one lever with a rotational lock

a rotatable shaft is connected, and the in

Distance is articulated from its lower end with at least one further lever, which in turn is articulated to a stationary part. With

This embodiment of the holding device can be made of a pure rotary motion, namely that of

Wave, the desired combined axial and radial

Generate movement of the inductor. , An embodiment of the invention will be explained in more detail with reference to the drawing; it

demonstrate :

Figure 1 in section the upper portion of a block

gas bottle ; FIG. 2 shows in perspective a drying station for drying a block gas cylinder in a first working position;

Figure 3 is a view similar to Figure 2, in the

however, the drying station is in a second working position; Figure 4 shows the side view of the drying station in the

shown in Figure 2 working position;

Figure 5 shows the side view of the drying station in the

shown in Figure 3 working position;

Figure 6 on a larger scale, the side view of a

Inductor, as used in the drying station of Figures 2 to 5; FIG. 7 shows the front view of the inductor;

8 shows the top view of the inductor.

Reference is first made to FIG. 1, by means of which the problem addressed by the present invention will be explained. The block gas bottle identified overall by the reference numeral 1 has a shoulder 2 in the upper area, via which the main area 3, which has a larger diameter, merges into a neck 4 of smaller diameter (see also FIGS. 2 to 5). On the neck 4, a shoulder collar 5 is shrunk, which carries an external thread 6 for a bottle cap (not shown). The shoulder collar 5 is located with a lower edge 7 on the outside of the shoulder 2 more or less dense at. The neck 4 has an internal thread 42.

When the raw block gas cylinder 1 is to be painted, various wet chemical pretreatments are required, for example in a degreasing bath.

For Zn-Phorsphatieren the entire block gas cylinder 1 is also sprayed from the outside with high pressure. In these operations, in particular due to different bath temperatures used in heated and unheated process steps liquid bath medium is sucked into the cavity 8, which lies between the neck 4, the shoulder 2 and the shoulder collar 5.

In the subsequent painting process is the

Gap between the edge 7 of the shoulder collar 5 and the outer surface of the shoulder 2 closed by the paint. If now the paint is dried, evaporated in the

Cavity 8 enclosed bath medium, which leads to the popping of the paint or rusting in the corresponding region of the block cylinder 1. Therefore, that must be

Bath medium can be reliably removed from the cavity 8 before painting.

This is done in a drying station, as shown in Figures 2 to 5 and the total of the

Reference numeral 10 carries. The drying station 10 comprises a floor frame 11, which has substantially four vertical columns 12, which are interconnected at the top by transverse struts 13. Further cross struts 14 in the lower region of the columns 12 stiffen the floor frame 11 in a known manner.

With the bottom frame 11 serving as a holding device swing frame 15 is connected in a manner as will be explained in more detail below. The swing frame 15 carries in the upper region an inductor 16, which is also explained in more detail below and used to dry the neck region of the block gas cylinder 1. The connection between the swing frame 15 and the

Floor frame 11 is as follows:

The two longitudinal bars 17, 18 of the swing frame 15th

are, at a distance from their lower ends, articulated via two levers 19, 20 to two opposite transverse struts 13. Articulated is both the connection between the levers 19, 20 and the longitudinal beams 17, 18 and the connection between the lower ends of the levers 19, 20 and the

Cross struts 13. The levers 19, 20 are connected to one another via a transverse bar 21 for stiffening and via a pivot shaft 22 at the lower end.

Also at the lower ends of the spars 17, 18 of the swing frame 15 each have a lever 23 is articulated. The opposite ends of the levers 23 are connected to a pivot shaft 25, which in turn is mounted on two opposite transverse struts 14. The pivot shaft 25 can rotate with the aid of an electric geared motor 27, which is also attached to one of the transverse struts 14, in both directions of rotation.

On the opposite side of the levers 23 of the pivot shaft 25, at a certain distance from this, a balance weight 28 is arranged.

The inductor 16, which is held in the upper region of the pivoting frame 15, is adapted in a particular manner both to the shape of the block gas cylinder 1 and to the construction of the drying station 1 described above. For a more detailed explanation is now on the figures 6 to 8, reference is made.

The inductor 16 comprises two parallel power supply lines 29, 30 as well as an active area 31 fed by these power supply lines 29, 30. The effective area 31 can first roughly be described as fitting the shape of the transitional area between the shoulder 2 and the shoulder collar 5 of the block gas cylinder 1 is adjusted, so relatively close to the corresponding surfaces

can be brought. A second special feature of the effective region 31 is that it has a gap 40 on the side facing away from the feeders 29, 30, due to which the effective region 31 can be pushed from the side over a holding rod 43 on which the

Block gas cylinder 1 suspended and by a not-shown in detail power-and-free conveyor through the

Drying station 1 and possibly. Through the whole system is promoted. In principle, the effective region 31 is a coil with

Windings of different diameters, but the different windings are not connected to each other in the manner of a normal helix. Rather, the leads

Feed line 29 initially via an arc 32 (see in particular Figure 7) in the uppermost turn 33. This arc 32 limits the gap 40 on one side. The winding 33 is connected via a further, the gap 40 on the other side bounding arc 34 with the lowermost turn 35. This in turn is over a rising area with a portion of the second bottom turn 36 in FIG

Connection, which in turn is connected to the second uppermost turn 37. This communicates with a second portion of the second lowermost turn 36. The latter in turn is connected to the feeder via a descending region 38, which can be seen particularly in FIG 30 connected. The described construction makes it possible, the above-mentioned gap 40 of the sphere of action

31 of the inductor 16 to realize. The inductor 16 is in a known manner with a

Power supply in connection with a possibly cooled generator with rectifier, DC link and inverter, as well as an adapter with

Capacitors and transformer and does not need to be described here in detail. This power supply can be arranged, for example, on a support frame 41, which on the top of the

Floor frame 11 is mounted. The drying station 1 described above operates as follows:

The block gas cylinder 1 to be dried coming from the pretreatments on the power-and-free conveyor is, as shown in FIGS. 1 and 4, arranged at a small distance and in a substantially vertical orientation in front of the swing frame 15 of the device 1.

The pivoting frame 15 is pivoted away from the vertical, as shown in Figures 2 and 4, so that the effective region 31 of the inductor 16 is slightly above the shoulder collar 5 and the shoulder 2, laterally of these.

The effective region 31 is now applied to the shoulder collar 5 and the shoulder 2 characterized in that the pivot shaft 25 is rotated by means of the motor 27. This Ver ^¬ rotation has the consequence that the spars 17, 18 of the pivot ^¬ frame 15 are pulled down. Due to the guidance of the swing frame 15 by the two upper levers 19, 20, which are hinged to the upper cross braces 13, while the pivot frame 15 is directed in a vertical Level off. In the movement of the swing frame 15 from the position shown in Figures 2 and 4 in the

Position of Figures 3 and 5, the effective range 31 of the inductor 16 moves from the side of the block gas bottle 1 and lowers simultaneously. The holding rod 43 penetrates into the gap 40 of the effective region 31. This lateral movement of the inductor 16 is superimposed on a vertical, downward movement. At the end of the described course of motion, the effective region 31 of the inductor 16 is in the required manner in the transition region between the shoulder 2 and the shoulder collar 5 at a small distance from their outer surfaces. Now, the inductor 16 is energized, whereby in the

Shoulder collar 5 and the shoulder 2 eddy currents are generated. These eddy currents substantially selectively heat the corresponding region of the block gas cylinder 1, the other regions of the block gas cylinder 1 not being heated appreciably. The selective heating drives the trapped in the cavity 8 between shoulder collar 5 and neck 4 and shoulder 2

Liquid in a short time. Experiments have shown that with appropriate parameters in a very short time and reliable complete drying of the block gas cylinder 1 can be achieved, the energy consumption is very low and subsequent cooling can be omitted.

Claims

claims

A method of painting block gas cylinders comprising: a main portion; a neck having a diameter smaller than the diameter of the main portion; a shoulder forming the transition between the main area and the neck; d) a shoulder collar attached to the neck; the method comprising the following steps: e) the block gas cylinder is pretreated with a treatment liquid, in particular degreased and / or Zn-phosphated; f) the pretreated block gas cylinder is dried; g) the dried block gas bottle is painted; characterized in that the step f) of drying comprises local inductive heating of the shoulder collar (5) and the adjoining portion of the shoulder (2).

2. Plant for painting block gas bottles, which have a) a main area, - b) a neck with a diameter which is smaller than the diameter of the main area; c) a shoulder forming the transition between the main area and the neck; d) a shoulder collar attached to the neck; the plant comprising: e) one or more treatment stations in which the block gas cylinder is pretreated with a treatment liquid, in particular degreased and / or Zn-phosphated; f) a drying station in which the pretreated block gas cylinders are dried; g) a painting station in which the dried block gas cylinders are painted; characterized in that e) the drying station comprises an inductor (16),

which is powered by a power supply and has an effective area (31) whose shape is adapted to the shape of the shoulder collar (5) and the adjacent area of the shoulder (2) such that the inductor (16) can be brought into position in which the active Area (31) in a suitable for inductive heating small distance from the shoulder collar (5) and adjacent to this area of the

Shoulder (2) is located.

3. Plant according to claim 2, characterized in that

in that the inductor (16) is held by a holding device (15) which is designed in such a way that the active region (31) of the inductor (16) has a component of movement directed axially onto the block gas bottle with respect to the axis of the shoulder collar (5) (1) can be set up.

4. Plant according to claim 2 or 3, characterized in that the inductor (16) by a holding device (15) is held, which is formed so that the effective range (31) of the inductor (16) with respect to the Axis of the shoulder collar (5) radially directed component of motion can be placed on the block gas cylinder (1), including the effective range (31) of the inductor (16) has a lateral gap (40).

5. Installation according to claim 4, characterized in that the holding device comprises a pivot arm (15) which is connected at its lower end via at least one lever (23) rotationally connected to a rotatable shaft (25) and at a distance from its lower end with at least one further lever (19, 20) is articulated, which in turn is articulated to a stationary part (13).