EP1119420A1

EP1119420A1 - Painting device

Info

Publication number: EP1119420A1
Application number: EP00960395A
Authority: EP
Inventors: Erich Meyer
Original assignee: Eisenmann Lacktechnik KG
Current assignee: Eisenmann Lacktechnik KG
Priority date: 1999-08-07
Filing date: 2000-08-04
Publication date: 2001-08-01
Anticipated expiration: 2020-08-04
Also published as: ATE307678T1; DE19937474C2; CZ20011228A3; CA2346419A1; DE50011440D1; EP1119420B1; DE19937474A1; WO2001010564A1

Abstract

Prior art painting devices are perceived as being disadvantageous in that a relatively large amount of paint is lost during cleaning carried out using a scraper, and by virtue of the fact that the color changing device can not be fully cleaned. In order to prevent this drawback, the invention provides that the scraping station (66) assigned to the color changing device (48) is arranged on the end of the color changing device (48) facing away from the connecting device (12). This enables the scraper, during a cleaning process, to also move through the color changing device (48) and to clean the same. In order to prevent a contamination of the paint supply device (60, 62, 64), a control element (18) closes a paint valve (54, 56, 58), which has just been opened, at the moment in which the scraper moves past the opening of the corresponding paint supply line (61, 63, 65). The position of the scraper is detected by a sensor (50) in the area of the color changing device (48). The residual paint present in the color changing device (48) between the opening of the corresponding paint supply line (61, 63, 65) and the scraping station (66) is carried away via a residual paint channel (72).

Description

painter

The present invention relates to a painting device according to the preamble of claim 1.

Such painting devices are known from the market. They use a so-called "pig" to clean the connecting device (generally a hose) between the paint changing device and the gun unit. This is an element, e.g. a ball which e.g. pressurized is moved by the connecting device. As a result, the connecting device can be cleaned, if necessary with the addition of a cleaning agent.

During painting, the pig is in a pig station in the known painting devices

Pistol unit area. Another pig station is located at the end of the color changing device facing the connecting device (this is understood to be a device which can optionally connect the spray gun with one of several pre-conveyed paint colors which are usually under pressure).

If the user interrupts the painting process, e.g. B. to change to a new color, the paint still in the connecting device is first withdrawn with a pump. The pig is then moved from its pig station located at the gun unit to the pig station of the color changing device and the connecting device behind the pig with air and a cleaning agent, e.g. a paint thinner, rinsed.

BESTATIGUNGSKOPIE The paint residues still in the connecting device are pressed back into the color changing device and into the corresponding paint feed line. Then compressed air is applied to the pig station assigned to the color changing device and the pig is thereby moved back towards the gun unit. The pig pushes the cleaning agent with the paint residues dissolved in it, which can be sprayed through the gun unit and collected in a container, for example. When it reaches the gun unit, it moves

Newt returned to its resting position in the newt station there.

A disadvantage of the known painting device is that a certain amount of residual paint remains in the color changing device at the end of the cleaning process. At the start of a new painting process, the gun therefore first comes out of paint contaminated by residual paint. Therefore, the user must first spray some paint before he can start the actual painting process. This increases the paint consumption, which is perceived as bad, especially from an environmental point of view.

The object of the present invention is therefore to develop a painting device of the type mentioned at the outset in such a way that the amounts of paint wasted in the cleaning process and the amounts of residual paint present in the system after a cleaning process are significantly reduced.

This object is achieved by the specified in claim 1

Painting device released.

Since the pig station assigned to the color changing device is located at the end of the color changing device facing away from the connecting device, the pig can be located

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the color changing device, where it would block their entrance for the pig, but is arranged in the area of the gun unit. Thus, the entrance from the connecting device to the color changing device for the pig is free, so that the pig can easily move into and through the color changing device.

According to the development according to claim 3, a single sensor is sufficient to control the closing process of the paint valve device and the residual paint valve device.

According to claim 4, a simple control is sufficient to achieve the goals of the invention.

The development of the invention according to claim 5 simplifies the handling of the painting device according to the invention, since no additional devices for driving the pig are required on the gun side.

The invention will now be explained in detail with reference to the single figure. This shows in a schematic block diagram a painting device, which is designated overall by reference number 10 (in the block diagram, fluid-carrying lines are drawn with double lines for better identification).

It comprises a gun unit 12, a stationary unit 14, a connecting device connecting the gun unit 12 to the stationary unit 14, which is designed here as a hose 16, and a controller 18, the functions of which will be explained in detail later.

First, the gun unit 12 will be explained in detail. A gun 20 includes a spray nozzle 22 which is directed to a container 24 in the figure. A paint pressure regulator 26 is connected to the gun 20. This is in turn connected via a valve 28 to a paint channel 30, which is part of the hose 16. The valve 28 has an open and a closed position and is controlled by the controller 18 via a line 31.

The gun 20 is mechanically connected to a switch 32, which provides the control 18 with an input signal via a line 34. As shown below, the switch 32 triggers a cleaning process.

The gun unit 12 further comprises a pig station 36, in which a pig, not shown in the figure, has its starting position. The pig station 36 is connected at one end to the paint channel 30 and at its other end to a valve 38. This is controlled by the control 18 via a line 40 and connects the pig station 36 to a secondary channel 42, which is also part of the hose 16.

A movement sensor 44 is arranged in the area of the exit of the pig station 36 to the lacquer channel 30, which emits a signal to the control 18 via a line 46 when the pig moves past it.

Now the functional elements of the stationary unit

14 explained. First of all, this comprises a color changing device 48, which is essentially an elongated cylindrical chamber. The color change device 48 is connected to the paint channel 30 at its end on the hose side. At this At the end there is also a movement sensor 50, which emits a signal to the control 18 via a line 52 when the pig moves past it.

Valves 54, 56 and 58 are arranged on the side of the color changing device 48 and can optionally connect the interior of the color changing device 48 to lacquer feeding devices 60, 62 and 64. Paint supply lines 61, 63 and 65 lead from the paint supply devices 60, 62 and 64 via the paint valves 54, 56 and 58 to the color changing device 48. The corresponding openings of the supply lines 61, 63 and 65 in the color changing device 48 are identified by the reference numerals 55, 57 and 59. The valves 54, 56 and 58 are controlled by the controller 18 via lines 66, 68 and 70.

It should be pointed out at this point that only three lacquer feed devices are shown in the present exemplary embodiment for reasons of clarity of the figure. In other exemplary embodiments, 50 lacquer feed devices and more can be connected. The color changing device must then of course be designed correspondingly larger.

At the end facing away from the hose 16, the color changing device 48 is connected to a pig station 66, in which the pig has its end position. A movement sensor 68 is arranged between the pig station 66 and the color changing device 48, which emits a signal to the control system via a line 70 when the pig moves past it.

At the end of the pig station 66, which faces away from the color changing device 48, the pig station 66 is via a residual paint channel 72 and a residual paint valve 74 connected to an outlet opening 76, which in the present exemplary embodiment lies above a residual paint container 78. The residual paint valve 74 is controlled by the control 18 via a line 80.

The pig station 66 is also connected at its end facing away from the color changing device 48 to a valve 82 which is controlled by the controller 18 via a line 84. At its other end, the valve 82 is connected to a compressed air source 86.

From this, a container 90 with a cleaning agent, e.g. Paint thinner, which in turn is fluidly connected to the secondary channel 42.

The painting device 10 works as follows:

In normal painting operation, the pig is located in the pig station 36 of the gun unit 12. The valve 38 in the gun unit 12 is closed, as are the valves 74 and 82 behind the stationary pig station 66. In principle, at most one of the paint valves 54, 56 and 58 is open , In the present case it is assumed that the paint valve 56 is open and the paint valves 54 and 58 are closed. Thus, paint from the paint feed device 62 passes through the paint supply line 63 through the paint valve 56 and via the mouth 57 into the paint changing device 48 and from there via the paint channel 30 through the opened valve 28 in the gun unit 12 through the paint pressure regulator 26 into the gun 20. The paint is sprayed through the nozzle 22.

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and the amount of residual paint present in the pig station 66 via the residual paint channel 72 and the outlet opening 76 into the residual paint container 78. The fact that the paint valve 56 is closed prevents cleaning agent from getting into the paint feed line 63.

As soon as the pig is in its end position in the pig station 66, this is detected by the sensor 68, which emits a signal to the controller 18 via the line 70. This causes the controller 18 to open the valves 28 and 82 and to close the valves 38 and 74. The pig is now charged with compressed air from the compressed air container 86 from the other side and pressed back through the color changing device 48 into the paint channel 30.

The cleaning agent in the paint channel 30 is pressed by the pig through the opened valve 28, the paint pressure regulator 26 and the gun 20 to the spray nozzle 22 and exits from it into the container 24.

As soon as the pig is back in the pig station 36, i.e. his

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44 determined which a signal to the controller

18 issues. The controller 18 closes the valve 82 again, whereby the cleaning process is completed. The

User can now e.g. Select a new color on the control 18 and open the corresponding valve 54, 56 or 58.

Claims

claims

1. Painting device with

a) a gun unit with which paint can be applied to a workpiece;

b) a color changing device to which at least two paint feed devices are connected;

c) a connecting device with which the gun unit and the color changing device are connected to one another;

d) a pig station assigned to the gun unit;

e) a pig station assigned to the color changing device;

f) a pig which during a cleaning phase can be moved from the pig station assigned to the gun unit through the connecting device into the pig station assigned to the color changing device and back again;

g) a paint valve device, which either connect one of the paint feed devices to the color changing device or the connection is complete. can constantly interrupt;

h) a residual paint valve device, which the

Color change device can connect to a drain line;

i) a controller which cooperates with the gun unit, the paint valve device and the residual paint valve device;

characterized in that

j) the pig station (66) assigned to the color changing device (48) is located in the vicinity of the end of the color changing device (48) facing away from the connecting device (12);

k) there is at least one sensor (50) in the area of the color changing device (48) which emits a signal to the control (18) when the

The pig moves past the sensor (50) in the direction of the pig station (66) assigned to the color changing device (48);

1) the controller (18) processes the signal from the sensor (50) in such a way that the currently open paint valve device (56) is closed at the moment when the pig at the mouth (57) of the corresponding paint feed device ( 62) on its way into the pig station (66) assigned to the color changing device (48); and

m) the control (18) opens the residual paint valve device (74) at this moment.

2. Painting device according to claim 2, characterized in that it has a color pressure regulator (26) which is arranged in the gun unit (12).

3. Painting device according to claim 1 or 2, characterized in that

a) the sensor (50) is arranged at the input of the connecting device (16) to the color changing device (48);

b) the controller (18) comprises a memory in which the time interval is stored that the pig for the movement from the sensor (50) to the mouth (57) of the paint feed device (which is currently in fluid communication with the color changing device (48)) 62) required;

c) the control the corresponding paint valve device (56) after the time interval since the receipt of the

Signal closes and the residual paint valve device (74) opens after this time interval.

4. Painting device according to claim 1 or 2, characterized in that a sensor is arranged at each mouth of a paint feed device in the color changing device and the control closes the just opened paint valve device and opens the residual paint valve device when it receives a signal from the corresponding sensor ,

5. Painting device according to one of the preceding claims, characterized in that the connecting device comprises a hose (16) which comprises at least one channel (30) for paint and at least one channel (42) for compressed air and / or cleaning agents.