阅读说明：本技术 涂覆喷嘴 (Coating nozzle ) 是由 H·比策尔 S·埃克斯坦 于 2020-03-16 设计创作，主要内容包括：本发明涉及一种用于将有粘性的材料涂覆到工件上的涂覆喷嘴,所述涂覆喷嘴具有喷嘴体(12),涂覆通道(14)穿过所述喷嘴体从材料入口(16)延伸到材料出口(18),其中,所述喷嘴体(12)沿第一空间方向(44)具有宽度(b),所述宽度大于沿垂直于第一空间方向(44)伸展的第二空间方向(46)所测量的厚度(d),并且所述涂覆通道(14)朝材料出口(18)沿所述第一空间方向(44)扩宽,并且所述涂覆喷嘴具有喷嘴保持件(20),所述喷嘴保持件具有基体(22)和两个夹持板(30),其中,用于有粘性的材料的输送通道(24)延伸穿过所述基体(22),所述输送通道在输送开口(26)处通入到所述材料入口(16)中,并且所述夹持板(30)贴靠在喷嘴体(12)的彼此背离的侧面(34)处地将喷嘴体(12)可脱开地固定在基体(22)上。根据本发明规定,两个夹持板(30)构造为分离的构件并且可脱开地固定在所述基体(22)上和所述喷嘴体(12)上,和/或所述喷嘴体(12)具有面状地彼此贴靠的两个喷嘴板(54),在所述两个喷嘴板之间存在有所述涂覆通道(14)的至少一个区段(50)。(The invention relates to an application nozzle for applying viscous material to a workpiece, having a nozzle body (12) through which an application channel (14) extends from a material inlet (16) to a material outlet (18), wherein the nozzle body (12) has a width (b) in a first spatial direction (44) which is greater than a thickness (d) measured in a second spatial direction (46) running perpendicularly to the first spatial direction (44), and the application channel (14) widens in the first spatial direction (44) toward the material outlet (18), and having a nozzle holder (20) which has a base body (22) and two clamping plates (30), wherein a feed channel (24) for the viscous material extends through the base body (22), which feed channel opens into the material inlet (16) at a feed opening (26), the clamping plate (30) detachably fixes the nozzle body (12) to the base body (22) in contact with sides (34) of the nozzle body (12) that face away from each other. According to the invention, the two clamping plates (30) are designed as separate components and are detachably fastened to the base body (22) and to the nozzle body (12), and/or the nozzle body (12) has two nozzle plates (54) lying flat against one another, between which at least one section (50) of the application channel (14) is located.)

1. An application nozzle for applying viscous material to a workpiece, having a nozzle body (12) through which an application channel (14) extends from a material inlet (16) to a material outlet (18), wherein the nozzle body (12) has a width (b) in a first spatial direction (44) which is greater than a thickness (d) measured in a second spatial direction (46) running perpendicularly to the first spatial direction (44), and the application channel (14) widens in the first spatial direction (44) toward the material outlet (18), and having a nozzle holder (20) with a base body (22) and two clamping plates (30), wherein a feed channel (24) for the viscous material extends through the base body (22), the feed channel opens out at a feed opening (26) into the material inlet (16), and the clamping plates (30) releasably fix the nozzle body (12) to the base body (22) in contact with sides (34) of the nozzle body (12) that face away from each other, characterized in that the two clamping plates (30) are designed as separate components and are releasably fixed to the base body (22) and to the nozzle body (12).

2. Coating nozzle according to claim 1, characterized in that the side faces (34) of the nozzle body (12) are inclined at an acute angle to one another, preferably at an angle of at most 30 ° and in particular at most 10 °, starting from the main body (22), and in that the clamping faces (32) of the clamping plates (30) which bear against the side faces (34) are inclined at the same angle to one another starting from the main body (22).

3. Coating nozzle according to claim 1 or 2, characterized in that the side faces (34) each extend up to an end region (52) with a material outlet (18) which projects from the intermediate space (36) between the two clamping plates (30) and at which the thickness of the nozzle body (12) increases.

4. Coating nozzle according to one of the preceding claims, characterized in that the clamping plates (30) each bear in a planar manner against one of the side faces (34) of the nozzle body (12) with a clamping face (32).

5. Coating nozzle according to one of the preceding claims, characterized in that each clamping plate (30) has a groove (38) in each case, in which a part (40) of the substrate (22) is accommodated.

6. Coating nozzle according to one of the preceding claims, characterized in that the clamping plate (30) and the nozzle body (12) are fixed to one another by means of at least one screw and/or at least one pin.

7. Coating nozzle according to any of the preceding claims, characterized in that the nozzle body (12) is made of hard metal.

8. Coating nozzle according to one of the preceding claims, characterized in that the nozzle body (12) has two nozzle plates (54) lying flat against one another, between which at least one section (50) of the coating channel (14) is present.

9. Coating nozzle according to claim 8, characterized in that each of the nozzle plates (54) has, on the side facing the other nozzle plate (54), a delimiting face (64) which delimits the coating channel (14) at least in sections, a shoulder (60) which projects from the delimiting face (64) with a first abutment face (62) which abuts against the other nozzle plate (54) parallel to the delimiting face (64), and a second abutment face (66) which is connected flat to the delimiting face (64) and against which the first abutment face (62) of the other nozzle plate (54) abuts.

10. An application nozzle for applying viscous material to a workpiece, having a nozzle body (12) through which an application channel (14) extends from a material inlet (16) to a material outlet (18), wherein the nozzle body (12) has a width (b) in a first spatial direction (44) which is greater than a thickness (d) measured in a second spatial direction (46) running perpendicularly to the first spatial direction (44), and the application channel (14) widens in the first spatial direction (44) toward the material outlet (18), and having a nozzle holder (20) with a base body (22) and two clamping plates (30), wherein a feed channel (24) for the viscous material extends through the base body (22), the conveying channel opens out into the material inlet (16) at a conveying opening (26), wherein the clamping plate (30) detachably fixes the nozzle body (12) to the main body (22) in contact with sides (34) of the nozzle body (12) that face away from one another, and the nozzle body (12) has two nozzle plates (54) that face one another, between which at least one section (50) of the application channel (14) is present, characterized in that each of the nozzle plates (54) has, on the side facing the other nozzle plate (54), a delimiting surface (64) that delimits the application channel (14) at least in sections, a shoulder (60) that protrudes from the delimiting surface (64) with a first contact surface (62) that contacts the other nozzle plate (54) and is parallel to the delimiting surface (64), And a second contact surface (66) which is connected to the limiting surface (64) in a planar manner and on which the first contact surface (62) of the other nozzle plate (54) is contacted.

11. Coating nozzle according to any of claims 8 to 10, characterized in that each nozzle plate (54) is structurally identical.

12. The application nozzle according to one of claims 9 to 11, characterized in that the second spatial direction (46) extends transversely and preferably perpendicularly to the contact surfaces (62, 66).

13. Coating nozzle according to one of claims 8 to 12, characterized in that each nozzle plate (54) is in each case made in one piece and preferably from hard metal.

14. Coating nozzle according to one of the preceding claims, characterized in that the coating channel (14) has a first section (48) which extends from the material inlet (16) and is bounded on both sides by the clamping plate (30), and has a second section (50) which extends to the material outlet (18) and is surrounded circumferentially by the nozzle body (12).

15. The application nozzle according to claim 14, characterized in that the first section (48) widens in the first spatial direction (44) starting from the material inlet (16) towards the second section (50).

16. The application nozzle according to claim 14 or 15, characterized in that the first section (48) and the end section of the feed channel (24) opening into the first section (48) at the material inlet (16) are at least partially lined by means of a sealing element (70) bearing against the base body (22) and the clamping plate (30).

17. The application nozzle according to claim 16, characterized in that the sealing element (70) is made in one piece of a thermoplastic material, preferably Polyoxymethylene (POM) or Polytetrafluoroethylene (PTFE).

18. The application nozzle according to claim 16 or 17, characterized in that the sealing element has an exit gap (72) opening into the second section (50), the width of which, measured in the first spatial direction (44), is a multiple of the thickness of which, measured in the second spatial direction (46).

19. The coating nozzle according to claim 18, characterized in that the thickness of the exit gap is at most twice as large and preferably about as large as the thickness of the second section (50) measured in the second spatial direction (46).

20. The coating nozzle according to claim 9 or 10 and any one of claims 14 to 19, characterized in that the second section (50) is defined on each side opposite to each other by a shoulder (60).

21. A method for producing a nozzle plate (54) for a coating nozzle (10) according to claim 20, wherein, for forming the first section (48) of the coating channel (14), a recess (56) is cut out of a hard metal plate, in each case by means of etching or cutting, and the defining face (64) and the second abutment face (66) are produced by grinding along the edge (58) defining the shoulder (60).

Technical Field

The present invention relates to a coating nozzle for applying viscous material to a workpiece according to the preamble of claim 1.

Background

Such application nozzles (also referred to as advection nozzles) are used to generate wide beams, for example for applying lacquers for seam painting or insulating materials which are to be applied to workpieces in a planar manner. Such coating nozzles are used in particular for coating body components for the automotive industry, but also for coating components of other devices, for example, installation devices for kitchens. In order to obtain a wide spray, the coating channel widens in a first spatial direction towards the material outlet, in which first spatial direction the width of the coating nozzle is measured, which is typically several times (for example 5 to 10 times) greater than the thickness of the nozzle body measured in a second spatial direction perpendicular to the first spatial direction. Concomitantly, the coating channel can be narrowed in the second spatial direction not only in the coating nozzles according to the prior art, but also in the coating nozzle according to the invention. The nozzle body is mounted on a nozzle holder, through which a feed channel extends, via which the material is guided into the application channel. A nozzle body is detachably fastened to the nozzle holder, wherein the nozzle holder in the previously known application nozzles has two clamping plates which bear against the sides of the nozzle body facing away from each other and hold it in a clamping manner in an intermediate space formed between the clamping plates. In the case of previously known application nozzles, one clamping plate is connected in one piece to the main body of the nozzle holder with the feed channel, while the other clamping plate is detachably fastened to the application nozzle and to the nozzle body. However, such a simple structure causes the following disadvantages: at the transition between the base body of the nozzle holder and the clamping plate, which is formed in one piece with the nozzle holder, an edge is formed, which, due to the one-piece construction, always has a certain radius. Due to the radius, the corresponding edge of the nozzle body cannot engage exactly correctly at this edge, so that leaks can occur between the supply channel and the application channel. DE 102016 n 014271 a1 discloses a coating nozzle having a two-part device as a holder.

Disclosure of Invention

The object of the present invention is therefore to improve an application nozzle of the type mentioned at the outset such that the tightness of the application nozzle is improved.

According to the invention, this object is achieved by a coating nozzle having the features of claim 1. Advantageous embodiments of the invention are the subject matter of the dependent claims.

The invention is based on the idea that, by forming the two clamping plates as separate components and by detachably fastening them to the base body and the nozzle, the edge defining the intermediate space between the clamping plates for receiving the nozzle body can be embodied as sharp as possible with a small radius, so that the nozzle body can be pressed into between the clamping plates in a good manner and a high degree of tightness is provided at the transition from the base body to the nozzle body. The sealing is also improved when, according to an advantageous development, the side faces of the nozzle body are inclined at an acute angle to one another from the base body, wherein the angle is preferably at most 30 ° and in particular at most 10 °. In particular, when the clamping surfaces of the clamping plates which bear against the side surfaces extend at the same angle from the base body toward one another, the clamping plates press the nozzle body against the base body with the latter being fixedly clamped.

Advantageously, the side faces each extend as far as an end region with a material outlet, which projects out of the intermediate space between the two clamping parts, at which end region the thickness of the nozzle body increases. The greater thickness of the nozzle body in the region of the material outlet increases its stability, so that the nozzle body is more mechanically resistant to mechanical loads, for example during cleaning. In particular, the end region can be designed as a shoulder which projects laterally on both sides.

Advantageously, the clamping plates each rest in a planar manner on one of the side surfaces of the nozzle body with a clamping surface. A good clamping action is thereby achieved. Furthermore, it is preferred that the clamping plates each have a groove in which a part of the base body is accommodated. This simplifies the positioning of the clamping plate with respect to the base body. The clamping plate and the nozzle body are expediently fastened to one another by means of at least one screw and/or at least one pin. This is a particularly simple type of fixation.

The nozzle body is preferably made of hard metal. Hard metal is understood here to mean a metal matrix composite in which hard material in the form of particles is held together by a matrix consisting of metal. In particular, metal carbides or metal nitrides, such as tungsten carbide, titanium nitride, niobium carbide, tantalum carbide or vanadium carbide, are used as hard materials. Although hard metals are more expensive materials than metals. However, hard metals are significantly more stable and more wear resistant (particularly with respect to viscous abrasive materials).

According to an advantageous further development of the invention (which also represents an independent inventive improvement over the prior art), the nozzle body has two nozzle plates lying flat against one another, between which at least one section of the application channel is present. Advantageously, the nozzle plates can be detachably placed against each other and pressed against each other by means of a clamping plate. It is possible that one of the nozzle plates has a recess forming the coating channel, while the other nozzle plate is ground flat and only said recess definitively covers the coating channel on one side. Preferably, however, the two nozzle plates are structurally identical. In this case, it is preferred that each of the nozzle plates has, on the side facing the other nozzle plate, a delimiting surface which delimits the application channel at least in sections, a shoulder which projects from the delimiting surface and has a first contact surface which contacts the other nozzle plate parallel to the delimiting surface, and a second contact surface which is connected flat to the delimiting surface and on which the first contact surface of the other nozzle plate contacts. Such a solution according to the invention according to the dependent claim 10 offers the advantage that the nozzle body can be manufactured more easily, in particular when the nozzle body is made of hard metal. In this case, the nozzle plates preferably abut against one another on an abutment surface, the second spatial direction extending transversely and preferably perpendicularly to the abutment surface. Advantageously, the nozzle plate is accordingly made in one piece and preferably of hard metal.

It is further preferred that the application channel has a first section extending from the material inlet and delimited on both sides by the clamping plate and has a second section extending to the material outlet and surrounded circumferentially by the nozzle body. In this case, it is possible for the coating channel to be widened in the first spatial direction only in its second section. However, it is preferred that the first section widens from the material inlet toward the second section, likewise in the direction of the first space. In particular, the nozzle plate can be produced simply from a hard metal plate, if the second section is delimited on the sides lying opposite one another by shoulders. In this case, to form the first section of the coating channel, a recess is cut out of the hard metal plate by means of etching or cutting, respectively, and then the delimiting surface and the second contact surface are produced by grinding along the edge delimiting the shoulder. In this case, only the contact surfaces and the surfaces delimiting the application channel need be ground, while grinding of the sides of the nozzle body facing away from each other can be dispensed with.

It is possible to seal by the nozzle body sealingly abutting against the nozzle holder. However, it is also possible for the first portion and the end portion of the conveying channel, which opens out into the first portion at the material inlet, to be lined at least in part by means of sealing elements which bear against the base body and the clamping plate in order to improve the sealing effect. In this case, the sealing element is preferably made in one piece from a thermoplastic material, preferably from Polyoxymethylene (POM) or Polytetrafluoroethylene (PTFE). Advantageously, the sealing element has an exit gap which opens into the second section, the width of which, measured in the first spatial direction, is a multiple of the thickness of which, measured in the second spatial direction. The thickness of the exit gap is expediently at most twice as great as the thickness of the second section measured in the second spatial direction and is preferably approximately as great in the sense that the thickness of the exit gap differs from the thickness of the second section by at most 10%.

Drawings

In the following, the invention is explained in more detail on the basis of two embodiments which are schematically shown in the drawings. In the drawings:

fig. 1a, 1b show a coating nozzle according to a first embodiment in two perspective views;

FIGS. 2a, 2b show the coating nozzle according to FIGS. 1a, 1b in a front view and in a side view;

FIGS. 3a, 3B show a cross section along the line A-A according to FIG. 2a or along the line B-B according to FIG. 2B;

FIGS. 4a to 4c show a nozzle plate of the coating nozzle according to FIGS. 1a, 1b in a perspective view, a side view and a front view, and

fig. 5a, 5b show a coating nozzle according to a second embodiment in two sectional views corresponding to fig. 3a, 3 b.

Detailed Description

The coating nozzle 10 according to the first exemplary embodiment shown in the figures has a nozzle body 12 through which a coating channel 14 for viscous material extends from a material inlet 16 to a material outlet 18. The nozzle body 12 is detachably mounted on a nozzle holder 20 which has a base body 22 through which a feed channel 24 for viscous material extends as far as a feed opening 26. The nozzle body 12 rests on a surface 28 of the main body 22, in which surface a delivery opening 26 is present, wherein the delivery opening 26 communicates with the material inlet 16, so that the delivery channel 24 opens out into the application channel 14 at the delivery opening 26. The nozzle holder 20 furthermore has two clamping plates 30, the clamping surfaces 32 of which, facing each other, rest against the sides 34 of the nozzle body 12 facing away from each other and hold the nozzle body 12 in a clamped, fixed manner in an intermediate space 36 between the clamping plates 30. For fastening to the base body 22, each of the clamping plates 30 has a groove 38, in which a portion 40 of the base body 22 is correspondingly accommodated, which is upwardly defined by the surface 28. A screw opening 42 extends through the nozzle body 12 and the clamping plate 30, through which a screw is guided, with which screw the clamping plate 30 is clamped with the nozzle body 12, so that the clamping surface 32 is pressed against the side surface 34. A further screw 43 secures the clamping plate 30 facing the viewer in fig. 1a to the base body 22, while a cylinder pin 45 is additionally guided through the clamping plate 30 facing the viewer in fig. 1a and the base body 22 and engages in a blind hole in the clamping plate 30 facing away from the viewer in fig. 1 a.

The nozzle body 12 has a width b in the first spatial direction 44 parallel to the side 34, which is significantly greater than a thickness d of the nozzle body, measured in a second spatial direction 46 perpendicular to the first spatial direction 44. The application channel 14 has a first section 48 extending from the material inlet 16, which is open toward the side 34 and is closed off in a sealing manner on both sides by the clamping surface 32. A second section 50 of the coating channel 14, which extends as far as the material outlet 18, is connected to the first section 48. As is shown in particular in fig. 3a, the two sections 48, 50 of the coating channel 14 widen in the first spatial direction 44 toward the material outlet 18. The widening is carried out at a constant opening angle, starting almost from the material inlet 16. In this way, a wide beam with a small thickness is achieved with the application nozzle 10 when applying viscous material to a workpiece. Furthermore, the two flanks 34 do not run parallel to one another, but extend from the base body 22 at an acute angle of approximately 8 ° toward one another. The same applies to the clamping surfaces 32, which likewise extend from the base body 22 at an acute angle of approximately 8 ° to one another. The clamping of the clamping plate 30 by means of the screws therefore tensions the nozzle body 12 in the direction of the base body 22 and secures it against the base body, so that the transition from the feed channel 24 into the application channel 14 is sealed off in a good manner. Since the nozzle holder 20 is constructed with three separate components (base body 22, clamping plate 30), the edges of all the components can be precisely ground so that they can be precisely joined together with the nozzle body 12. A thickened end region 52 of the nozzle body 12 projects upwardly away from the main body 22 from the intermediate space 36. At said end region 52 there is a material outlet 18.

The nozzle body 12 is assembled from two identically constructed nozzle plates 54, each of which is made in one piece from hard metal (fig. 4a to 4 c). Each of the nozzle plates 54 is made of a plate-shaped blank made of hard metal. Here, the open-edged recess 56, which forms the material inlet 16 and the first section 48 of the coating channel 14 in part, is first introduced into the blank by means of etching or cutting. The blank is then ground on one side along the edge 58, so that the shoulder 60 remains. The shoulder 60 has a first abutment surface 62. Connected to the shoulder 60 is a limiting surface 64 which runs parallel to the first contact surface 62 and delimits the second section 50 of the coating channel 14 to one side. Finally, a second abutment surface 66 is connected to the delimiting surface 64, said second abutment surface being coplanar with said delimiting surface. The two identically constructed nozzle plates 44 are detachably placed on each other for forming the nozzle body 12 in such a way that the first contact surface 62 of one nozzle plate 54 contacts the second contact surface 66 of the other nozzle plate 54 in a planar manner and vice versa. The second section 50 of the coating channel 14 is then between these two defining faces 64. The nozzle plates 54 are fixed to one another by means of the clamping plate 30 and screws.

The coating nozzle 110 according to the second embodiment (fig. 5a, 5b) differs from the coating nozzle 10 according to the first embodiment only in details apart from its size and geometry. Accordingly, like features are provided with like reference numerals in the drawings and are not described separately. In the first embodiment, the sealing of the application channel 14 and the feed channel 24 takes place in the region of the feed opening 26 by the nozzle plate 54, the clamping plate 30 and the base body 22 resting sealingly against one another, while in the second embodiment the first section 48 of the application channel (which here furthermore has a constant width over its entire length in the first spatial direction 44) and the end section of the feed channel 24 opening into said first section 48 are lined by means of a sealing element 70 made of thermoplastic material. The sealing element bears circumferentially against the nozzle body 12, the base body 22 and the clamping plate 30 and provides an improved seal in this region. The sealing element 70 has an exit gap 72, which opens into the second section 50 of the application channel, the thickness of which, measured in the first spatial direction 44, is approximately as great as the thickness of the application channel 14, which is defined by the distance of the delimiting faces 64.

Summarizing, the following can be determined: the invention relates to a coating nozzle 10 for applying viscous material to a workpiece, having a nozzle body 12 through which a coating channel 14 extends from a material inlet 16 to a material outlet 18, wherein the nozzle body 12 has a width b in a first spatial direction 44 that is greater than a thickness d measured in a second spatial direction 46 extending perpendicular to the first spatial direction 44, and the coating channel 14 widens in a first spatial direction 44 towards the material outlet 18, and has a nozzle holder 20, which has a base body 22 and two clamping plates 30, wherein a delivery channel 24 for viscous material extends through the base body 22, which delivery channel opens into the material inlet 16 at a delivery opening 26, and the clamping plate 30 releasably fixes the nozzle body 12 to the main body 22 in abutment against the sides 34 of the nozzle body 12 facing away from one another. According to the invention, the two clamping plates 30 are designed as separate components and are releasably fastened to the main body 22 and to the nozzle body 12, and/or the nozzle body 12 has two nozzle plates 54 lying flat against one another, between which at least one section 50 of the application channel 14 is located.