Nozzle device for applying viscous material

Abstract

The invention relates to a nozzle device (10) for applying a viscous material to a workpiece, comprising a nozzle body (12) which comprises a central part (14) having an end face (16) and two lateral parts (18) which protrude from the central part (14) at a distance from one another, each lateral part (18) has a transverse side (20) which is connected to the end face (16) and extends transversely thereto, the two transverse sides (20) facing each other, an outlet (22) for the viscous material being provided in each transverse side (20) and a material channel (44) extending through the nozzle body (12) towards each outlet (22), the material channel connects the outlet (22) and the material inlet (40) of the nozzle body (12). According to the invention, the nozzle body (12) has a base body (26) and a cover body (30) which is detachably fastened to the base body (26), and the material channel (44) is delimited at least in sections by both a boundary surface (50) on the base body (26) and a boundary surface (52) on the cover body (30).

Description

Technical Field

[0001] The invention relates to a nozzle arrangement for applying a viscous material to a workpiece according to the preamble of claim 1. Background Art

[0002] Such a nozzle arrangement is known, for example, from EP 3 548 190 B1. With such a nozzle arrangement, in particular two surfaces of a workpiece facing away from each other can be coated simultaneously with a viscous material by arranging the workpiece between the lateral parts of the nozzle body in such a way that, for example, two surfaces to be coated and facing away from each other on a vertical flange of a vehicle body face the lateral sides. In this case, the nozzle arrangement is moved relative to the workpiece, in particular by means of an industrial robot, so that the end face of the workpiece connecting the surfaces to be coated faces the end face of the nozzle arrangement. The disadvantage of known nozzle arrangements of the type mentioned at the outset is that they are difficult to manufacture due to their complex geometry. Summary of the invention

[0003] It is therefore an object of the present invention to improve a nozzle arrangement of the type mentioned at the outset in such a way that it is easier to produce.

[0004] This object is achieved according to the invention by a nozzle arrangement having the features of claim 1. Advantageous developments of the invention are the subject matter of the dependent claims.

[0005] The invention is based on the idea that the nozzle body is constructed in multiple pieces so that the material channel and the outlet can be made in the nozzle body more easily. In particular, the material channel can be partially milled in the base body and / or the cover body of the nozzle body and then the base body and the cover body can be joined together, especially by means of screw connections, so that the material channel is locally defined not only by the boundary surface on the base body but also by the boundary surface on the cover body. This can be realized more simply in terms of manufacturing technology than drilling the material channel completely in the nozzle body. In addition, more complex geometries of the material channel can be realized, so that, for example, a smaller pressure loss is generated by a larger cross section of the material channel. Since the nozzle device has multiple components, the material channel can be optimized in terms of fluid technology. In particular, dead angles can be minimized or avoided. The installation of the nozzle device can also be simplified.

[0006] In the end face, a further outlet for the viscous material can be provided, which is connected to the material inlet by means of a further material channel. Via the further outlet, the viscous material can then be applied to the end face of the workpiece facing the central part, so that the workpiece can be coated simultaneously on three side faces that are adjacent to each other in pairs. It is also preferred that the outlet is arranged mirror-symmetrically with respect to a symmetry plane, which in particular can extend through the further outlet. The nozzle arrangement can apply the viscous material symmetrically to two surfaces of the workpiece facing away from each other. In other application cases, an asymmetrical arrangement of the outlets can also be preferred.

[0007] Expediently, a central channel extends from the material inlet through the nozzle body and opens into the lateral material channels and optionally into the central further material channel. For this purpose, it is advantageous to provide a distribution point at the transition between the central channel and the material channels and optionally the further material channels. The central channel and the further material channels preferably have a common central longitudinal axis, so that the further material channels are an extension of the central channel.

[0008] The central channel is expediently arranged in the base body. The base body can be multi-part and have a base for fastening to the nozzle holder and an end piece detachably connected to the base, in particular the central channel extends through the base and branches into the material channel and optionally the further material channel at a distribution point arranged in the end piece. It is also preferred that the outlet and / or the material inlet and / or the further outlet and / or the further material channel are arranged in or on the base body.

[0009] The material channels advantageously each have a first section and a second section connected to the first section in the material flow direction, the first sections being defined by a boundary surface on the base body and on the cover body, and the second sections being defined only by the base body. Thus, when manufacturing the nozzle device, the first section can be milled out in the base body and / or in the cover body and the second section can be subsequently, in particular starting from the first section, drilled out in the base body.

[0010] Suitably, the cross section of the central channel is greater than the sum of the cross sections of each outlet and optionally the other outlet. A cross section reduction is thus produced at the branch point. It is preferred that the cross section of the central channel is at least twice, preferably at least three times and ideally at least four times the sum of the cross sections of the outlet and optionally the other outlet. In addition, the outlet and optionally the other outlet are preferably constructed identically. It is preferably constructed as a so-called flat stream nozzle (Flatstream-Düse), in which the outlet and optionally the other outlet respectively have a rectangular cross section, the length of which is at least five times and preferably at least ten times its width. Here, the length of the outlet is suitably measured in a direction extending away from the end face of the central part, and the length of the other outlet is suitably measured in a direction extending from one lateral side to another lateral side. By this means, the material can be coated into a very wide material strip.

[0011] The outlet and optionally the further outlet are advantageously arranged in a nozzle insert connected to the nozzle body. The nozzle insert is inserted into the nozzle body and is preferably fixed thereto by means of an adhesive connection. In particular when discharging viscous materials, wear at the outlet is high, so it is advantageous if the nozzle insert is made of a low-wear material. In order to reduce wear, the nozzle insert is advantageously made of a hard metal at least on its inner side facing the viscous material. "Hard metal" is understood here to mean a metal-based composite material in which hard materials in the form of particles are bonded together by a metal matrix. In particular, metal carbides or metal nitrides, such as tungsten carbide, titanium carbide, titanium nitride, niobium carbide, tantalum carbide or vanadium carbide can be used as hard materials.

[0012] A sealing element is expediently arranged between the base body and the cover body, which surrounds the boundary surfaces on the base body and the cover body that define the material channel. In particular, an elastomeric sealing element or a sealing element made of metal can be used, which then prevents the material from undesirably flowing out from between the base body and the cover body. However, the sealing can also be achieved by the metal surfaces of the base body and the cover body being in flat contact with each other. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] The present invention will be described in detail below with reference to the exemplary embodiments schematically shown in the accompanying drawings. The accompanying drawings are as follows:

[0014] Figure 1a , Figure 1b , Figure 1c A perspective view, a side view and a view along the nozzle arrangement are shown. Figure 1b A cross-sectional view of line AA; and

[0015] Figures 2a to 2d Show according to Figures 1a to 1c A first side view, a second side view, and a nozzle device according to Figure 2aThe cross-sectional view along the line CC and along the Figure 2b A cross-sectional view of line BB. DETAILED DESCRIPTION

[0016] The nozzle device 10 shown in the drawings has a nozzle body 12, which includes a central part 14 with an end face 16 and two lateral parts 18 protruding from the central part 14 at a distance from each other, each of which has a lateral side 20 extending transversely to the end face 16. The lateral sides 20 are spaced apart from each other and face each other. An outlet 22 for viscous material is arranged in each lateral side 20, and a further outlet 24 for viscous material is arranged in the end face 16. The nozzle body 12 is constructed in a multi-part manner with a base body 26 and a cover body 30 detachably fixed to the base body 26 by means of screws 28. The base body 26 is also constructed in a multi-part manner with a base 32 and an end part 36 detachably connected to the base 32, the base having a threaded hole 34 for fixing to a tool holder, in which the outlet 22 and the further outlet 24 are arranged.

[0017] The central channel 38 leads from the material inlet 40 through the base 32 to the dispensing point 42, where it branches into two material channels 44, each of which leads to one of the outlets 22, and a further material channel 46, which leads to the further outlet 24. A first section 48 of each material channel 44 extending from the dispensing point 42 is defined here on one side by a boundary surface 50 of the base body 26 and on the other side by a boundary surface 52 of the cover body 30. The first section 48 of the material channel 44 is formed here by a first contour 54 milled into the base body 26 and a second contour 56 milled into the cover plate 30. Starting from each first section 48, a second section 58 of the respective material channel 44 extends to the associated outlet 22, which second section is drilled obliquely from the first section 48 into the base body 26. The further material channel 46 can be drilled into the main body 26 in two stages, namely with a larger diameter starting from the distribution point 42 and with a smaller diameter starting from the end face 16 .

[0018] The outlet 22 and the further outlet 24 are respectively arranged in a nozzle insert 60 made of hard metal which is inserted into the base body 26 and connected to the base body 26 by means of an adhesive connection. In the embodiment shown here, each nozzle insert 60 is constructed identically, a section protrudes from the base body 26 and has a cross-sectional constriction leading to the corresponding outlet 22, 24. The cross-sectional constriction enables a better distribution of the material to the workpiece. However, the nozzle insert 60 can also be constructed differently. Each outlet 22 and the further outlet 24 are constructed as flat flow nozzles with a rectangular cross section, the longitudinal side of which extends in the drawing plane in the drawings is five to ten times longer than the transverse side extending perpendicular to the drawing plane in the drawings. In addition, a sealing element 62 made of an elastomeric material or of metal is arranged between the base body 26 and the cover body 30 around the interface 50, 52 or the contour 54, 56, which prevents material from undesirably flowing out through a possible gap between the base body 26 and the cover body 30. The sealing element 62 is adapted in its shape to the geometry of the separating surfaces 50 , 52 or the contours 54 , 56 .

[0019] In summary, it should be pointed out that the present invention relates to a nozzle device 10 for applying a viscous material to a workpiece, the nozzle device having a nozzle body 12, the nozzle body comprising a central part 14 with an end face 16 and two lateral parts 18 protruding from the central part 14 at a distance from each other, each lateral part 18 having a lateral side 20 connected to the end face 16 and extending transversely to the end face, the two lateral sides 20 facing each other, an outlet 22 for the viscous material is arranged in each lateral side 20 and a material channel 44 extends through the nozzle body 12 towards each outlet 22, the material channel connecting the outlet 22 with the material inlet 40 of the nozzle body 12. According to the invention, it is provided that the nozzle body 12 has a base body 26 and a cover body 30 detachably fixed to the base body 26, the material channel 44 being at least partially defined not only by a boundary surface 50 on the base body 26 but also by a boundary surface 52 on the cover body 30.

Claims

1. A nozzle device for applying a viscous material to a workpiece, the nozzle device comprising a nozzle body (12), the nozzle body comprising a central part (14) having an end face (16) and two lateral parts (18) protruding from the central part (14) at a distance from each other, each lateral part (18) having a lateral side (20) connected to the end face (16) and extending transversely to the end face, the two lateral sides (20) facing each other, an outlet (22) for the viscous material being arranged in each lateral side (20) and a material channel (44) extending through the nozzle body (12) to each outlet (22), the material channel connecting the outlet (22) to a material inlet (40) of the nozzle body (12), characterized in that The nozzle body (12) comprises a base body (26) and a cover body (30) detachably fastened to the base body (26), the material channel (44) being defined at least in regions both by a boundary surface (50) on the base body (26) and by a boundary surface (52) on the cover body (30).

2. The nozzle device according to claim 1, characterized in that A further outlet (24) for viscous material is provided in the end face (16), which is connected to the material inlet (40) by means of a further material channel (46).

3. The nozzle device according to claim 1 or 2, characterized in that: The outlet (22) is arranged mirror-symmetrically with respect to a plane of symmetry, in particular extending through the further outlet (24).

4. A nozzle arrangement according to any one of the preceding claims, characterised in that A central channel (38) extends from the material inlet (40) through the nozzle body (12) and opens into the material channel (22) and optionally into the further material channel (24).

5. The nozzle device according to claim 2 and claim 4, characterized in that The central channel (38) and the further material channel (24) have a common central longitudinal axis.

6. The nozzle device according to claim 4 or 5, characterized in that The central channel (38) is arranged in the base body (26).

7. A nozzle arrangement according to any one of the preceding claims, characterised in that The outlet (22) and / or the material inlet (40) and / or optionally the further outlet (24) are arranged in or on the base body (26) and / or optionally the further material channel (46) is arranged in the base body (26).

8. A nozzle arrangement according to any one of the preceding claims, characterised in that The material channels (44) respectively have a first section (48) and a second section (58) connected to the first section (48) in the material flow direction, each of the first sections (48) being defined by a boundary surface (50, 52) on the base body (26) and on the cover body (30), and each of the second sections (58) being defined only by the base body (26).

9. A nozzle arrangement according to any one of the preceding claims, characterised in that The cross section of the central channel (38) is greater than the sum of the cross sections of the outlets (22) and optionally the further outlets (24).

10. A nozzle arrangement according to any one of the preceding claims, characterised in that The outlet (22) and optionally the further outlet (24) each have a rectangular cross section, the length of which is at least five times and preferably at least ten times as long as its width.

11. The nozzle device according to claim 10, characterized in that Center planes extending parallel to the longitudinal sides of the outlet (22) and optionally the further outlet (24) and perpendicular to the respective cross-sections lie in a common plane in space.

12. A nozzle arrangement according to any one of the preceding claims, characterised in that The outlet (22) and optionally the further outlet (24) are each arranged in a nozzle insert (60) which is connected to the nozzle body (12).

13. The nozzle device according to claim 12, characterized in that The nozzle insert (60) is made of hard metal at least on its inner side facing the viscous material.

14. A nozzle arrangement according to any one of the preceding claims, characterised in that A sealing element (62) is arranged between the base body (26) and the cover body (30), which surrounds boundary surfaces (50, 52) on the base body (26) and on the cover body (30) that define the material channel (22).

15. A method for producing a nozzle device (10) according to any one of the preceding claims, wherein each material channel (44) of the nozzle device has a first section (48) and a second section (58) connected to the first section (48) in the material flow direction, the first section (48) being defined not only by a boundary surface (50) on the base body (26) but also by a boundary surface (52) on the cover body (30), and the second section (58) being defined only by the base body (26), characterized in that: The first section (48) is milled out in the base body (26) and / or in the cover body (30), and the second section (58) is drilled out in the base body (26).

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