EP1586381A2 - Application head for producing a liquid film - Google Patents

Abstract

The application head (1) for the application of especially a liquid film has a connection (15) for the feed of the application medium. Several outlet orifices (24) for the delivery of the medium extend from a chamber (17) for the flat delivery of the application medium from the chamber. The application head is characterized by a modular construction with several modules (2-5) detachably interconnected. The outlet holes are located in a detachably mounted and exchangeable module (5). An independent claim is included for a use for the application head which is to produce a liquid film.

Description

The invention relates to an application head for dispensing a Application medium according to the preamble of the claim 1, in particular for the production of a liquid film for Transport protection of a motor vehicle.

For the protection of motor vehicles during transport by the manufacturer Among the traders are so-called liquid films used, which automates using an application head be applied to the vehicle body. These Technology allows good vehicle protection and a flexible coating of individual partial surfaces of different Vehicle models, with only changes of the application paths of the respective coating robot required are. In addition, both horizontal and vertical Surfaces coated with such a liquid film become.

From DE 199 36 790 A1 an application head is known, the the production of a liquid film for transport protection of Motor vehicle bodies allows. For this purpose, the known Application head on two spray nozzles, over which the coating agent is applied, which forms the liquid film.

However, this known application head has several disadvantages which are briefly explained below.

A disadvantage of the known application head is that that the coating agent beyond the edge of the film addition is applied, which is also referred to as "overspray" and a time-consuming cleaning of the motor vehicle to be protected requires.

Another disadvantage of the known application head exists in that the applied film at the web start and end fray, which affects the protective effect and the later Removal of the film difficult.

In addition, the known application head produces a film with a nonuniform layer thickness, what with a too thin film leads to inadequate protection and at one too thick film associated with high material consumption is.

Furthermore occurs in the use of the known application head a blistering in the film, causing the Protective effect is also impaired.

Further, the web width when applied to the above limited known application head described what to leads to long cycle times.

Finally, the known application head requires expensive Material supply systems.

The invention is therefore based on the object, the above described known application head accordingly improve.

This object is achieved by an application head according to the invention solved according to claim 1.

The application head according to the invention has to supply the Application medium on a material connection, which in a Chamber opens, with the chamber several outlet openings lead out to apply the application medium surface to be able to.

The chamber between the material connection and the outlet openings causes a largely constant pressure of the application medium at the different outlet openings, resulting in a uniform application of the application medium contributes.

In addition, in the application head between the Material connection and the outlet opening several chambers in Flow direction can be arranged one behind the other, wherein the individual chambers in fluid communication with each other. This advantageously contributes to a uniform application pressure in which the coating quality is improved.

The individual chambers of the application head according to the invention can each have the same volume, but there is in the context of the invention, the possibility that the individual Chambers have different sizes of volumes.

The volume of the individual chambers also has an influence on the application behavior, since a large chamber volume at the beginning of an application process causes uncontrolled spraying and at the end of an application process an equally uncontrolled dripping. Therefore, the application head according to the invention preferably has a small chamber volume, so that the beginning and the end of an application process can be set as accurately as possible. For example, the chamber volume of each individual chamber or all chambers together may be less than 2000 mm ³ , 1000 mm ³ , 500 mm ³ or even less than 400 mm ³ . Preferably, however, the chamber volume depends on the number and the cross-section of the outlet openings, since with a small number of outlet openings and the chamber volume should be correspondingly small in order to avoid dripping at the end of an application process. With a total cross-section A _{GES of} all outlet openings, the chamber volume V _{CHAMBER of} each individual chamber or of all chambers together preferably behaves as V _CHAMBER = A _GES * k, where k is preferably between 1 mm ² and 10 mm ² , with a value of k between 2.6 mm ² and 6 mm ² has proven to be particularly advantageous.

The application head according to the invention preferably exists from several modules, the individual modules preferably selected according to the desired coating properties can be and solvable (for example, by a Screw connection) are interconnected.

Preferably, the outlet openings are in one detachably mounted and exchangeable module of the application head arranged. This offers the advantage that the number and the geometric arrangement of the outlet openings easy can be changed by mounting a corresponding module becomes.

The individual modules are preferably in the flow direction arranged one behind the other, so that the application medium preferably flows through all the chambers in succession.

In the aforementioned multi-chamber arrangement of the invention Application head, the individual chambers each case be formed by one of the modules, so that the number of chambers by a variation of the number of modules. In addition, too the size of the chambers to the application medium used be adapted by selecting a suitable module and is mounted.

The individual modules are preferably plate-shaped and can be mounted one above the other, with the individual Modules are preferably fixed by screw connections.

Preferably, the outlet openings are in this respect the web direction of the application head arranged side by side, which leads to an enlargement of the web width and to a corresponding shortening of cycle times leads. The train direction of the application head in this case is preferably perpendicular to the longitudinal extent of the application head.

In such an arrangement of the outlet openings transversely to the web direction of the application head extends the Chamber in the application head preferably in lateral Direction to the outermost outlet, so that the Pressure of the application medium over the entire web width is kept largely constant.

In a preferred embodiment, there are several rows provided by outlet openings, wherein the individual rows arranged in the web direction of the application head one behind the other are. Every point of the body surface to be protected is thus successively of several rows of Outlets swept over, which is beneficial to one uniform coating leads.

Preferably, the outlet openings in the individual Rows here laterally offset from each other, causing the Uniformity of application of the application medium on is improved.

The individual rows of outlet openings are preferably essentially obtuse or even at right angles to Oriented web direction of the application head.

However, the invention is not with an application head with limited to several rows of outlet openings. It is Rather, it is also possible that the application head according to the invention having only a single row of outlet openings, preferably this row is substantially obtuse or even at right angles to the web direction of the Application head is aligned.

The outlet openings of the application head according to the invention can each have a round jet nozzle, the Application medium radiates all around. The round jet nozzle is in this case preferably in a screw thread in the outlet opening screwed or pressed in, so that the round jet nozzle is interchangeable. This provides the opportunity in the application head over the web width round jet nozzles with to screw in a different passage cross section, in spite of a pressure gradient in the chamber a homogeneous To achieve spray pattern.

Moreover, within the scope of the invention, it is possible to that one or more of the outlet openings of the application head be closed by a blind plug, around the web width at an application head with a given Reduce width. Preferably, this is at least one of the respect to the web direction of the application head outside outlet openings through a blind plug locked.

The individual outlet openings are preferably as bores or nozzles formed in the application head. Farther is to be mentioned that the outlet openings in the Application head according to the invention in contrast to slit-shaped Nozzles preferably have a round cross-section, wherein the cross section is preferably circular.

Furthermore, the lateral distance between adjacent outlet openings preferably sufficiently small to be at lower Layer thickness to achieve a closed application film. For example, the lateral distance between the adjacent outlets less than 20%, 10% or even less than 5% of the web width.

Furthermore, the invention is not limited to those described above Application head limited as a single component, but also includes an application robot with such Application head.

The described advantages arise in particular in connection with a piston dispenser for targeted dosage of Liquid Film.

Furthermore, the invention also encompasses the novel use such an application head for producing a liquid film.

The invention advantageously allows easy development a series of application heads to different Application widths.

In addition, with the application head according to the invention Application media of different viscosity processed be replaced by the used round jet nozzles become.

Furthermore, the application head according to the invention is or quantity-controlled application systems can be used.

Are advantageous to the application head according to the invention also the small layer thickness fluctuations, the low overspray in the application, the edge sharpness of the applied Railways, the compact design, the cost-effective technology in the area of the application head and easy cleaning of the application head.

Figur 1

eine Querschnittsansicht eines erfindungsgemäßen Applikationskopfs mit einem modularen Aufbau aus einem Oberteil, zwei Zwischenplatten und einem Unterteil,

Figur 2A

eine Querschnittsansicht des Oberteils aus Figur 1 entlang der Schnittlinie A-A in den Figuren 2B und 2C,

Figur 2B

eine Draufsicht auf das Oberteil gemäß Figur 2A,

Figur 2C

eine Bodenansicht des Oberteils aus den Figuren 2A und 2B,

Figur 3A

eine Querschnittsansicht der oberen Zwischenplatte des Applikationskopfs aus Figur 1 entlang der Schnittlinie B-B in den Figuren 3B und 3C,

Figur 3B

eine Draufsicht auf die obere Zwischenplatte gemäß Figur 3A,

Figur 3C

eine Bodenansicht der oberen Zwischenplatte gemäß den Figuren 3A und 3B,

Figur 4A

eine Querschnittsansicht der unteren Zwischenplatte und des Unterteils des Applikationskopfs aus Figur 1 entlang der Schnittlinie C-C in Figur 4B sowie

Figur 4B

eine Draufsicht auf die Zwischenplatte bzw. das Unterteil gemäß Figur 4A.

Other advantageous developments of the invention are characterized in the subclaims or are explained in more detail below together with the description of the preferred embodiment with reference to FIGS. Show it:

FIG. 1

a cross-sectional view of an application head according to the invention with a modular structure of an upper part, two intermediate plates and a lower part,

FIG. 2A

1 is a cross-sectional view of the upper part of FIG. 1 along the section line AA in FIGS. 2B and 2C,

FIG. 2B

a top view of the upper part of Figure 2A,

Figure 2C

a bottom view of the upper part of Figures 2A and 2B,

FIG. 3A

1 is a cross-sectional view of the upper intermediate plate of the application head of FIG. 1 along the section line BB in FIGS. 3B and 3C,

FIG. 3B

a top view of the upper intermediate plate according to Figure 3A,

FIG. 3C

a bottom view of the upper intermediate plate according to the figures 3A and 3B,

FIG. 4A

a cross-sectional view of the lower intermediate plate and the lower part of the application head of Figure 1 along the section line CC in Figure 4B and

FIG. 4B

a plan view of the intermediate plate or the lower part of Figure 4A.

The cross-sectional view in FIG. 1 shows an application head 1, for the automated application of liquid film can be used by means of a robot, wherein the application head 1 is guided by the robot.

The application head 1 is modular and consists in Essentially from an upper part 2, two intermediate plates 3, 4 and a lower part 5, wherein the upper part 2, the intermediate plates 3, 4 and the upper part 5 in the following figures detail are shown.

The upper part 2, the intermediate plates 3, 4 and the lower part of the fifth each have a rectangular base with a length of 82 mm and a width of 25 mm, taking on the Ends each have a mounting hole 6-11, through which in mounted state each have a fastening screw 12, 13th is guided through, wherein the fastening screws 12, 13 simplified in the drawing by a dot-dashed Line are shown.

At the top of the upper part 2 is a circumferential collar 14 integrally formed, which carries on its inside an internal thread and a material connection 15 forms, to which a supply line can be connected for the application medium.

At the bottom of the material connection 15 is located in the Upper part 2 has a through hole 16 with a diameter of 3 mm, wherein the through hole 16 in a chamber 17 at the underside of the upper part 2 passes. The application medium So comes from the material port 15 on the Through hole 16 in the chamber 17, wherein the chamber 17th the task is to apply the application across the entire width of the application head 1 as constant as possible to to achieve a homogeneous spray pattern.

The upper intermediate plate 3 has three more through holes in the middle with a diameter of three millimeters on, wherein the through holes 18-20, the chamber 17 in the connect upper part 2 with a chamber 21, which is formed on the underside of the intermediate plate 3.

The lower intermediate plate 4 in turn has two rows of Through holes 22, 23 with a diameter of 3 mm on, which lead out of the chamber 21. The through holes 22, 23 are arranged in two rows, which are rectangular aligned to the web direction of the application head 1 are. In addition, the through holes 22 of the one Row laterally opposite the through holes 23 of the offset another row, resulting in a uniform spray application contributes.

The through holes 22, 23 in the lower intermediate plate 4 are aligned with corresponding through holes 24 in the Lower part, wherein the outlet openings of the through holes 24 each have an internal thread, in each one Round jet nozzle can be screwed. Instead of Round jet nozzle is also possible, the outlet openings the through holes 24 through a blind plug close to the web width of the application head to reduce.

The two chambers 17, 21 extend here laterally Direction over all outlet openings of the through holes 24, wherein the chambers 17, 21 the application pressure essentially constant over the entire web width which contributes to a homogenous spray pattern.

The size of the chambers 17, 21 can be here to the properties of the application medium used, by the upper part 2 or the intermediate plate 3 selected accordingly becomes.

The same applies to the cross section of the through holes 18-20, 22-24, also by a suitable selection of the Between plates 3, 4 and 5 of the lower part adjusted accordingly can be.

The invention is not preferred to that described above Embodiment limited. Rather, one is Variety of variants and modifications possible, as well to make use of the idea of the invention and therefore fall into the scope.

LIST OF REFERENCE NUMBERS

1

application head

2

top

3

intermediate plate

4

intermediate plate

5

lower part

6-11

mounting hole

12, 13

mounting screws

14

collar

15

material connection

16

Through Hole

17

chamber

18-20

Through holes

21

chamber

22-24

Through holes

Claims (10)

Application head (1) for dispensing an application medium, in particular for producing a liquid film, with a) a material connection (15) for supplying the application medium, b) an outlet opening (24) for dispensing the application medium and c) a chamber (17, 21) into which the material connection (15) opens and from which the outlet opening (24) opens,
marked by d) a plurality of outlet openings (24), which lead to the surface delivery of the application medium from the chamber (17, 21). Application head (1) according to claim 1, characterized by a modular construction of a plurality of modules (2-5). Application head (1) according to claim 2, characterized gkennzeichnet that the individual modules (2-5) are detachably connected together. Application head (1) according to claim 3, characterized in that the outlet openings (24) are arranged in a detachably mounted and exchangeable module (5). Application head (1) according to one of the preceding claims, characterized in that a plurality of chambers (17, 21) and / or a plurality of modules (2-5) are arranged one behind the other in the flow direction between the material connection (15) and the outlet opening (24). Application head (1) according to claim 5, characterized in that the individual modules (2, 3) each form or contain one of the chambers. Application head (1) according to one of claims 2 to 6, characterized in that the individual modules (2-5) are each plate-shaped. Application head (1) according to one of the preceding claims, characterized in that the outlet openings (24) have a different passage cross-section. Application device, in particular application robot, with an application head (1) according to one of the preceding Claims. Use of an application head (1) according to one of Claims 1 to 8 for the production of a liquid film.

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