DE202010002572U1 - paint shop - Google Patents

Abstract

Painting installation (1) for serial painting of workpieces (4) with an omega-shaped conveyor guide around a central, rotatable atomizer unit (12) with a number of atomizers (14) and a control unit for aligning the atomizers (14) with their associated workpieces (4 ), wherein the control unit is designed to control a rotation of at least one atomizer (14) synchronously with the workpiece (4) associated therewith.

Description

The The invention relates to a painting plant for serial painting of workpieces with an omega-shaped Conveyor leadership.

to Coating of workpieces with appropriate coating materials, in particular paints, in Paint application systems are painting techniques for cost, but also for environmental reasons preferably, which have a particularly high paint application efficiency. This order efficiency describes the proportion of the original used Lacquer, which is applied to the workpiece in the painting technique, and is thus a measure of the paint losses, which occur during the coating. One of these painting techniques with high order efficiency has been used for many decades electrostatic coating method by means of a spray disc.

A such a spray disc is a paint sprayer, the in the form of a horizontally rotating disc varnish at an angle from 360 ° to atomized on the outside. In addition to this atomization An electrostatic charge is made by the spray disc generated paint mist.

A usual paint shop 1 by means of a spray disc 2 is in 1 shown. The workpieces to be painted 4 become in the example after 1 in an omega-shaped conveyor course 6 around the rotating spray disc 2 guided and thereby painted. The workpieces 4 are grounded so that the electrostatically charged paint mist from the workpieces 4 is tightened and thus a coating of the workpieces 4 he follows. Is a coating of the workpieces 4 desired on all sides, the workpieces can 4 while pumping around the spray disk 2 to be turned around. For uniform coating of vertically extended workpieces 4 becomes the spray disk 2 during painting by means of a lifting device 8th vertically along a support tube 10 moved up and down. Such paint shops 1 are still frequently in practical use today.

such Lackieranlagen with spray discs are very suitable for the paint of large Series of the same or similar Workpieces that are rotationally symmetric in itself, ie z. B. shock absorbers, fire extinguishers, gas cylinders or pipes. A spray disk is able to atomize a very high amount of paint per unit of time and to apply, so that spray discs usually the paint atomizing capacity of several conventional paint sprayers to unify.

There the one from the spray disk atomized amount of paint always simultaneously from several workpieces, the omega loop it is not possible to use different workpieces with it strongly different surface finish to be painted simultaneously in the painting area of the spray disc to edit, because otherwise very different paint layer thicknesses would result on the different workpiece surfaces.

Also, a painting of different sized workpieces with the paint shop described above is problematic, since at different thickness or length of the workpieces forms an uneven paint film thickness and also reduces the order efficiency of the Lackieranlange, resulting in additional costs. So if z. B. gas cylinders of very different lengths and / or diameters are to be painted with a spray disc must be adjusted between the batches of the same workpiece dimensions, inter alia, the operating parameters "Lackausbringmenge" and "Lackierhubhöhe the atomizer" changing for the next batch requirements, so it does not come to incorrect painting. For such a conversion of the operating parameters, however, is a Leerfahrt the omega loop, as in 2 shown as an example, necessary, which leads to production or capacity failures.

Will an operator of such a spray disc so diversify its production in terms of the workpiece models to be painted, ie z. B. paint different lengths of gas cylinders in different diameters, it must hold for each different batch of the same workpieces gaps in the loading of its conveyor system, which lead to a total reduction in overall capacity in the productivity of the system. A varnishing of several differently sized workpieces, as in 3 is shown as an example, is therefore not possible.

Due to the lack of further options for the serial coating of different workpieces with omega-shaped conveyor systems, it is therefore necessary to resort to straight, linear conveyor systems. These are usually designed such that usually a plurality of paint atomizers are arranged on a lifting device, which oscillate up and down in front of the suspended on a straight / linear conveyor workpieces and paint with their spray only one of the passing workpieces. In this case, the operating parameters of the paint sprayer (including paint application rate and Lackierhub) are each automatically changed so that they are adapted to the needs of just passing workpiece. However, if the workpieces in the vertical direction are relatively long and the paint stroke of the / s of the is relatively high, it may be necessary to track the / the atomizer synchronized with the conveying path of each currently painted workpiece in order to ensure a complete and uniform coating from top to bottom.

The conversion a paint shop with a spray disk and omega-shaped conveyor course on an operation with a straight conveyor course However, because of the thus also associated renovation of the paint booth and the conveyor system very expensive and expensive.

Of the Invention is therefore based on the object, a paint shop for serial painting of workpieces with an omega-shaped Conveyor leadership, the a coating of different sized workpieces within a batch in the simplest way possible. In particular, the costs of retrofitting to such a system preferably be kept low.

These The object is achieved according to the invention by the omega-shaped Conveyor leadership by one central, rotatable atomizer unit with a number of atomizers and a control unit for aligning the atomizer their assigned workpieces is arranged, wherein the control unit for controlling a rotation at least one atomizer is designed synchronously with its associated workpiece.

The Invention goes from consideration from that production capacity obtained such a paint shop at different sized workpieces can be, although on the common and dispenses with advantageous spray disk in many areas. This is possible, by the spray disk these are replaced by single atomizers becomes. In this case, an efficient and uniform coating of the workpieces can be achieved Be by every atomizer own a workpiece is assigned, and the operating parameters of the atomizer in dependence his assigned workpiece are set. For this purpose, a control unit is provided, each atomizer individually controls and the operating parameters such as the Lackaufbringmenge and the Lackierhub depending on the atomizer assigned workpiece established. For a uniform circular coating of the workpiece is the atomizer unit rotatably mounted. Therefore, you can the atomizers synchronous with the at the omega-shaped Conveyor guidance along current workpiece rotate and thus the workpiece evenly coat all around. At the same time, the synchronous movement of the atomizer with the workpiece becomes the same executed in front of the control unit.

But also for Workpieces, which are relatively long in the vertical direction and for the Painting stroke is therefore relatively high, the / the atomizer also synchronous to the delivery process the respectively just painted workpiece tracked by the atomizer unit on the support tube in synchronism with the conveyor movement is turned.

to Coating of vertically extended workpieces allows the individual atomizers in advantageous embodiment be moved vertically up and down by means of a lifting device. For one high paint application efficiency are in particularly advantageous embodiment electrostatic atomizers used. These atomizers electrostatically charge the paint mist produced by them, so that the paint particles by electromagnetic field forces automatically to the grounded workpieces to be pulled. This ensures that a particularly high Proportion of the paint evenly the workpieces is applied.

For an effective Coating as different as possible workpieces can the atomizers expediently individually and independently be controlled by each other. This prevents, for example that individual smaller workpieces coated with the operating parameters of a running before him, larger workpiece be and thus it comes to different paint thicknesses on the workpieces.

For the increase of Production capacity are the angular distances the same atomizer an integer multiple of the angular distance of the workpieces. In order to can several workpieces processed simultaneously with one atomizer each become. It is therefore not in the course of painting to idle times through idle Atomizer.

A Such a paint shop is characterized in particular by existing paint shops with omega-shaped guide rails and spray disks particularly easy and inexpensive converted can be. This is the disc atomizer disassembled from its support tube and through a nebulizer mount replaced, which can accommodate one or more atomizers, which spray their spray on only one of the workpieces straighten that in the remaining omega loop around that from a lifting device inside the omega loop up and down guided vertical support tube around guided become.

The Operating parameters of paint sprayer (s) (including paint application rate and paint stroke) each automatically according to the needs of each painted by the individual atomizer workpiece be adjusted.

One embodiment The invention will be explained in more detail with reference to a drawing. Show:

1 a paint shop with a spray disk with workpieces of the same size,

2 a paint shop with a spray disk with two workpiece batches of different dimensions,

3 a paint shop with a spray disc with workpieces of different dimensions,

4 a vertical section of the paint shop with workpieces of different dimensions, and

5 a plan view of the paint shop.

Same Parts are provided with the same reference numerals in all figures.

A usual paint shop 1 for coating workpieces 4 is 1 refer to. This is an omega-shaped conveyor course 6 on which the workpieces 4 hanging attached to a spray disc 2 guided. By positioning the spray disc 2 in the center of the omega-shaped loop, a constant atomizer distance is achieved. The spray disc described above atomises the paint at an angle of 360 ° to the outside and additionally charges the resultant paint mist electrostatically. These charged paint particles are automatically attracted to the grounded workpieces by the electromagnetic attraction forces. For a coating of the back of the workpieces 4 These may be in addition to movement along the omega-shaped delivery path 6 be rotated about its longitudinal axis. For optimum vertical coating of the workpieces 4 is the spray disk 2 on a support tube 10 fastened, which by means of a lifting device 8th can be moved vertically up and down.

In such a painting a uniform and uniform coating, however, can only be guaranteed if the workpieces 4 are dimensioned similarly. For completely different workpieces 4 is a change in the operating parameters, such as the Lackabgabemenge or Lackhub, so the necessary vertical displacement of the spray disc, different. For a conversion of the operating parameters, it is therefore necessary to idle a full Omegaschlaufe, as in 2 is shown by way of example. These idling phases inevitably lead to undesirable capacity decreases of the productivity of the paint shop. A desired finish of completely different workpieces, as exemplified in 3 is shown, is thus not possible.

In the 4 illustrated paint shop 1 is deliberately similar to the already known and in 1 illustrated paint shop 1 built to keep the conversion costs particularly low. However, this painting plant has 1 not over a spray disk 2 but via a nebulizer unit replacing it 12 , This atomizer unit 12 consists essentially of a holder for a number of individual atomizers 14 , These atomizers are each on a temporarily assigned to them workpiece 4 directed and coat this workpiece 4 with paint. The individual atomizers are electrostatic atomizers 14 , which electrostatically charge the paint mist generated by them, whereby the paint particles by the electromagnetic attraction automatically to the grounded workpieces 4 to be pulled. For vertical coating of workpieces 4 is the atomizer unit 12 also with the support tube 10 connected and can via the lifting device 8th be moved vertically up and down. Also a vertical movement of the individual atomizers independently is possible. To get a coating of the workpiece 4 from all sides, this may be in addition to movement along the omega-shaped rail 6 also be rotated along its longitudinal axis. The atomizer unit 12 is also rotatable about the support tube 10 stored so that the individual atomizers 14 synchronous with their assigned workpieces 4 can migrate and so a coating of the workpiece 4 from all sides is possible. Is a coating of the workpiece 4 finished, the atomizers rotate counter to the conveying direction of the workpieces to the next assigned workpieces 4 and start the coating anew. The paint shop after 4 and 5 consists of two atomizers, for example 4 , which have an angular distance from each other, which is an integer multiple of the angular distances of the workpieces. In the case shown, it is three times the distance. However, any other integer is conceivable.

For transmission the operating parameters to the individual atomizers is a control unit, not shown intended. This control unit can separate every single atomizer control each other and corresponding to the assigned to him workpiece Operating parameters such as the Lackhubhöhe or the Lackabgabemenge but also especially the rotation parameter for the synchronous Transmit cascade of atomizer.

It is also important for a perfect finish with several individual atomizers instead of a single spray disk that the individual atomizers have a coating distance to the workpiece comply, which is based essentially on the original Lackierabstand the spray disc. For this purpose, the atomizers must remain limited in their dimensions to the previously existing diameter of the spray disk.

1

paint shop

2

spray disk

4

workpiece

6

omega-shaped conveying process

8th

lifting device

10

support tube

12

atomizer

14

atomizer

Claims (5)

Paint shop ( 1 ) for serial painting of workpieces ( 4 ) with an omega-shaped conveyor guide around a central, rotatable atomizer unit ( 12 ) with a number of atomizers ( 14 ) and a control unit for aligning the atomizers ( 14 ) on the workpieces assigned to them ( 4 ), wherein the control unit for controlling a rotation of at least one atomizer ( 14 ) synchronously with the workpiece ( 4 ) is designed. Paint shop ( 1 ) according to claim 1, wherein the individual atomizers ( 14 ) by means of a lifting device ( 8th ) are arranged vertically movable. Paint shop ( 1 ) according to claim 1 or 2, wherein the atomizers ( 14 ) are electrostatic atomizers. Paint shop ( 1 ) according to one of claims 1 to 3, wherein the individual atomizers ( 14 ) are individually and independently controllable by the control unit. Paint shop ( 1 ) according to one of claims 1 to 4, wherein the angular distance between two atomizers ( 14 ) an integer multiple of the angular distance of the workpieces ( 4 ).