DE202012011450U1 - Device for spraying a hotmelt adhesive - Google Patents

Abstract

Apparatus for spraying a hot-melt adhesive, comprising a spray head for melting the melt adhesive starting material, and a spray nozzle (16) from which the melted hot-melt adhesive is sprayed, characterized in that the spray nozzle (16) at the distal end (14) of an extension Pipe element (12) is provided.

Description

The invention relates to a device for spraying a hot melt adhesive, with a spray head for melting the hot melt adhesive starting material, and with a spray nozzle, from which the molten hot melt adhesive is sprayed.

Such devices are usually designed as spray guns, which have a spray head, in which the hot melt starting material is melted, and to which the spray nozzle is directly and directly attached. Such spray guns are intended for manual operation.

Furthermore, devices of the aforementioned type are known, wherein a spray head, for example. Is mounted on the arm of a robot to automate the spraying of the hot melt adhesive. Also in these known devices, the spray nozzle - as in the above-mentioned spray guns - mounted directly and directly on the spray head, so that the accessibility to an object to be sprayed with hot melt adhesive often leaves something to be desired.

In view of these conditions, the invention has for its object to provide a device of the type mentioned, which has a good accessibility compared to the known devices of the type mentioned above also to any hot melt to be sprayed objects.

This object is achieved by the features of claim 1, d. H. achieved in that the spray nozzle is provided at the distal end of an extension tube element.

The fact that in the device according to the invention, the spray nozzle is provided on an extension tube element and not directly and directly to a spray head, there is the advantage that even relatively inaccessible areas of an object can be sprayed in a simple manner with molten hot melt adhesive. For this purpose, it has proved to be particularly advantageous if the spray nozzle is oriented inclined relative to the extension tube element, d. H. when the center axis of the spray nozzle includes a defined angle with the central axis of the extension tube member. The spray nozzle is thus not aligned axially with the extension tube element.

In order not to affect the properties of the hot melt adhesive during its forward movement through the extension tube member, it is preferable that the extension tube member is provided with a heater. The heater may be formed by an electrical resistance heating coil. The heating coil may be formed as a dimensionally stable, self-supporting heating coil, which is pushed onto the extension tube element. Another possibility is, for example, that the electrical resistance heating coil is wound onto the extension tube element.

In order to minimize or eliminate energy losses by heat radiation from the electrical resistance heating coil, it has proven to be expedient if a thermal insulation surrounds the heating coil. This thermal insulation can be formed by a dimensionally stable, self-supporting tube of heat-insulating material. Said tube preferably completely encloses the electrical resistance heating coil and may be fixed axially immovably between the spray nozzle and a fastening device, by means of which the extension tube element is fastened with its proximal end to a spray head. Likewise, it is possible that the thermal insulation is formed by a heat-insulating winding of a suitable strip, braid or strip material.

Further details, features and advantages will become apparent from the following description of an embodiment of the device according to the invention shown in the drawing.

Show it:

1 partially cut away an exploded perspective view of the spray device,

2 partially cut away in a perspective view of the spray device according to 1 in assembled condition,

3 a view of the spray device with cut drawn thermal insulation, and

4 one of the 3 similar view of the spray device in the direction of arrow IV in 3 with longitudinally drawn thermal insulation.

The 1 to 4 illustrate an embodiment of the device 10 for spraying a molten hot melt adhesive, which is provided for connection to a not shown spray head, in which the hot melt starting material is melted. The device 10 has an extension tube element 12 on, at its distal end 14 a spray nozzle 16 is provided. From the spray nozzle 16 the molten hot melt adhesive is sprayed. The spray nozzle 16 has a nozzle head in a conventional manner 18 and a nozzle cap 20 on. The nozzle cap 20 is on a male thread section 22 screwed on, at the distal end 14 of the extension tube element 12 is trained.

Like from the 1 . 2 and in particular 4 can be seen, is the spray nozzle 16 against the extension tube element 12 inclined oriented. The inclination angle is in 4 denoted by "w".

The extension tube element 12 is with a heater 24 provided by an electrical resistance heating coil 26 is formed. A thermal insulation 28 , which is shown cut in the drawing figures, surrounds the electrical resistance heating coil 26 , The thermal insulation 28 is from a pipe 30 formed of a heat-insulating material. The pipe 30 extends axially immovable between the spray nozzle 16 and a fastening device 32 at the proximal end 34 of the extension tube element 12 is attached and which serves for attachment to a not shown spray head. The fastening device 32 has a nut element 36 (please refer 1 ), with its female thread on one at the proximal end 34 of the extension tube element 12 trained male threaded portion is screwed. The fastening device 32 also has a ring element 38 on, at its one end face with an inner waistband 40 is trained. The inner waistband 40 is in the assembled state of the device 10 on the ring element 36 ie between this and the ring element 36 facing front end 42 of the pipe 30 at. The inner waistband 40 thus surrounds the ring element 36 , The ring element 38 is with a connection organ 42 the fastening device 32 firmly connected, which is assigned to the not shown spray head.

The extension tube element 12 has a connection nipple 44 on, with the not shown spray head mechanically fixed, fluidly and sealingly connectable to the outside or is connected.

LIST OF REFERENCE NUMBERS

10

contraption

12

Extension tube element (from 10 For 16 )

14

distal end (from 12 )

16

Spray nozzle (on 14 )

18

Nozzle head (from 16 )

20

Nozzle cap (from 16 )

22

Male thread section (at 14 For 18 )

24

Heating (from 10 at 12 )

26

electric resistance heating coil (from 24 )

28

Thermal insulation (from 10 For 26 )

30

Pipe (from 28 )

32

Fastening device (from 10 For 12 at 34 )

34

proximal end (from 12 )

36

Ring element (from 32 at 34 )

38

Ring element (from 32 at 34 )

40

Inner waistband (at 38 For 36 )

42

Connection nipple (from 12 at 34 )

Claims (6)

Apparatus for spraying a hotmelt adhesive, comprising a spray head for melting the melt adhesive starting material, and a spray nozzle ( 16 ), from which the melted hotmelt adhesive is sprayed, characterized in that the spray nozzle ( 16 ) at the distal end ( 14 ) of an extension tube element ( 12 ) is provided. Apparatus according to claim 1, characterized in that the spray nozzle ( 16 ) against the extension tube element ( 12 ) is inclined by an angle (w). Device according to claim 1, characterized in that the extension tube element ( 12 ) with a heater ( 24 ) is provided. Device according to claim 3, characterized in that the heating ( 24 ) of an electrical resistance heating coil ( 26 ) is formed. Apparatus according to claim 4, characterized in that a thermal insulation ( 28 ) the heating system ( 24 ) surrounds. Device according to claim 5, characterized in that the thermal insulation ( 28 ) from a pipe ( 30 ) is formed of a heat-insulating material.

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