Suction nozzle for a suction device

Abstract

The present invention relates to a Suction nozzle (110) for a suction device (100) for conveyance of cut waste strips (210) of a film web (200) comprising a nozzle duct (10) with a nozzle inlet (12) for suctioning the waste strips (210) and with a nozzle outlet (14) for introducing the waste strips (210) into the suction duct (130), wherein the nozzle duct (10) comprises an inlet portion (12a) adjacent to the nozzle inlet (12) and an outlet portion (14a) adjacent to the nozzle outlet (14) and between the outlet portion (14a) and the inlet portion (12a) an at least one rotation portion (16a) is assembled, whose flow cross section (20) is at least partially twisted over the run of the rotation portion (16a).

Claims

1. A suction nozzle for a suction device for conveyance of cut waste strips of a film web comprising a nozzle duct with a nozzle inlet for suctioning the waste strips and with a nozzle outlet for introducing the waste strips into a suction duct, wherein the nozzle duct comprises an inlet portion adjacent to the nozzle inlet and an outlet portion adjacent to the nozzle outlet and between the outlet portion and the inlet portion an at least one rotation portion is assembled, whose flow cross section taken perpendicularly to a direction of a run of the rotation portion has a rectangular or triangular geometric form and is at least partially twisted over the run of the rotation portion, so that the flow cross section is rotated around the direction of the run of the rotation portion, wherein the nozzle inlet comprises a mounting interface and the outlet portion comprises a rectangular or triangular geometric form.

2. The suction nozzle according to claim 1, wherein the suction duct comprises a constant or a mainly constant flow cross section between the nozzle inlet and the nozzle outlet.

3. The suction nozzle according to claim 1, wherein the rotation portion is partially flexible for a variation of shape of the turning of the flow cross section via the course of the rotation portion.

4. The suction nozzle according to claim 1, wherein the rotation portion comprises a twisting of a flow cross section with an angle area of approximately 45 to approximately 135.

5. The suction nozzle according to claim 4, wherein the rotation portion comprises a twisting of a flow cross section with an angle area of approximately 88 to approximately 100.

6. The suction nozzle according to claim 4, wherein the rotation portion comprises a twisting of a flow cross section with an angle area of approximately 88 to approximately 92.

7. The suction nozzle according to claim 1, wherein at least the inlet portion or the outlet portion comprise a bended run of the flow cross section, wherein this bended run of at least the inlet portion or the outlet portion comprise a bending axis to the axis of rotation of the turning of the flow cross section in the course of the rotation portion.

8. The suction nozzle according to claim 7, wherein the bending axis is adjusted perpendicularly or mainly perpendicularly to the axis of rotation of the turning of the flow cross section in the course of the rotation portion.

9. The suction nozzle according to claim 1, wherein at least the outlet portion and/or the nozzle outlet comprises a bearing device for a movable bearing of the suction nozzle at a suction duct of the suction device.

10. The suction nozzle according to claim 1, wherein the width of the flow cross section at the nozzle inlet is greater or equal to the maximum width of the waste strip of the film web.

11. The suction nozzle according to claim 1, wherein the rotation portion comprises wall surfaces, which comprise area portions for the configuration of the twisting of the flow cross section via the course of the rotation portion.

12. The suction nozzle according to claim 11, wherein the rotation portion comprises the wall surfaces, which comprise triangular area portions.

13. A suction device for suction and conveyance of cut waste strips of a film web, comprising a suction duct, at least a suction nozzle for a suction device for conveyance of the cut waste strips of a film web comprising a nozzle duct with a nozzle inlet for suctioning the waste strips and with a nozzle outlet for introducing the waste strips into the suction duct, wherein the nozzle duct comprises an inlet portion adjacent to the nozzle inlet and an outlet portion adjacent to the nozzle outlet and between the outlet portion and the inlet portion an at least one rotation portion is assembled, whose flow cross section taken perpendicularly to a direction of a run of the rotation portion has a rectangular or triangular geometric form and is at least partially twisted over the run of the rotation portion, so that the flow cross section is rotated around the direction of the run of the rotation portion, wherein the nozzle outlet is fluid communicating connected to the suction duct, and at least a blower for the generation of an air stream within the suction duct and the at least one suction nozzle, wherein the nozzle inlet comprises a mounting interface and the outlet portion comprises a rectangular or triangular geometric form.

Description

(1) Further advantages, features and details of the invention result from the subsequent description in which in relation to the drawings embodiments of the invention are described in detail. Thereby, the features described in the claims and in the description can be essential for the invention each single for themselves or in any combination. It is shown:

(2) FIG. 1 a first embodiment of a suction nozzle according to the invention,

(3) FIG. 2 an embodiment of FIG. 1 in another perspective representation,

(4) FIG. 3 a further embodiment of a suction nozzle according to the invention,

(5) FIG. 4 an embodiment of a suction device according to the invention,

(6) FIG. 5 an embodiment of a bearing device according to the invention,

(7) FIG. 6 a further embodiment of a bearing device,

(8) FIG. 7 a further embodiment of a bearing device,

(9) FIG. 8 a further embodiment of a bearing device and

(10) FIG. 9 a further embodiment of a suction nozzle according to the invention.

(11) In FIGS. 1 and 2 a first embodiment of a suction nozzle 110 according to the invention is shown. This is configured with a nozzle duct 10, which extends from the upper side to the lower side. At the upper edge here the nozzle outlet 14 is shown, which represents the edge of the neighboring outlet portion 14a. The lower edge of the suction duct 130 is shown for the nozzle duct 10 with a nozzle inlet 12 and adjacent with an inlet portion 12a. Between the inlet portion 12a and the outlet portion 14a a rotation portion 16a is extending.

(12) In the embodiment of FIG. 1 and FIG. 2 different bendings and a turning are shown. Thus, the inlet portion 12a and the outlet portion 14a are bended about a bending axis 30, respectively. The outlet portion 14a thereby proceeds preferably about a bending of up to approx. 90. This bending is particularly dependent from the respective spatial situation and can be configured differently or may not be existent according to the coiling device. The inlet portion comprises a bending of approx. 30 to 40 about the bending axis 30. The rotation portion 16a is configured twisted concerning the flow cross section 20 about a turning axis 40. The turning angle about the turning axis 40 is approx. 90.

(13) Based on the bending of FIG. 1 and FIG. 2 a waste strip 210 can be sucked into the nozzle inlet 12 now. Via the bended course of the inlet portion 12a a bended conveyance of the waste strip 210a in the rotation portion 16a occurs. There a straight conveyance occurs during a turning of the waste strip 210 about the axis 40. After the termination of this turning process a further bended conveyance about the bending axis 30 of the outlet portion 14a can occur in order to finally introduce the waste strip 210 via the nozzle outlet 14 in a corresponding suction duct 130 assembled at the bearing device 70.

(14) FIG. 3 shows the embodiment of FIG. 1 and FIG. 2 with a modification of the nozzle inlet 12. Thus, here a mounting interface 18 is shown at which a corresponding suction device can be assembled, which actively supports the suction of the waste strip 210. Here, the mounting interface 18 is a flange system, which can ensure this assembly by a corresponding screw connection.

(15) Likewise, FIG. 9 shows a modification of the embodiments of FIGS. 1 and 2. Here it can be recognized that a straight outlet portion 12a is possible without any bending within the scope of the present invention. The further functions correspond to the embodiments of FIGS. 1 to 3.

(16) FIG. 4 shows schematically an embodiment of a suction device 100 according to the invention. Based on a production machine 300 a film web 200 is produced by an extrusion process. Starting at a certain position a cutting occurs, which is shown by a dotted line. Through this cutting waste strips 210 result, like in this case two edge strips and one central strip. In order to remove these waste strips 210 from the film web such that the film web subsequently can be conveyed in conveyance direction F itself in the single film web portions, here the suction device 100 is intended. Via a blower 120 a negative pressure is produced at the suction duct 130. The suction duct 130 is in a fluid communicating connection with the suction nozzle 110 of the embodiment of FIGS. 1 to 3 for each waste strip 210. Thus with this embodiment a number of three suction nozzles 110 is intended. Schematically here also a turning and a bending is shown. Thus the suction of all waste strips 210 can occur at the respective position and by the combination from bending and turning can be transferred to a common transverse orientation of the suction duct 130. Therewith, adjacent to the suction duct 130 via a single line a plurality of here three waste strips 210 can be conveyed to the blower 120. Likewise it is shown that after the entry through the blower 110 and particularly after the re-granulating of the waste strip 210 a return of this re-granulate in the production machine 300 is possible.

(17) In FIG. 5 a possibility of a displaceable bearing device 70 is shown, which here also acts as a sealing device for the suction nozzle 110 with the help of multiple zippers. FIG. 6 shows an alternative solution for the bearing device 70, wherein here a displaceable sealing plate against a film cover as a bearing device 70 is provided. FIG. 7 likewise shows a solution of the bearing device 70 wherein here the sealing is ensured via a zipper system. FIG. 8 likewise shows a zipper system for the bearing device 70, wherein here one single zipper is sufficient.

(18) The previous description of the embodiments describes the present invention only within the scope of examples. Naturally, single features of the embodiments as far as technically meaningful can be freely combined with one another without leaving the scope of the present invention.

REFERENCE LIST

(19) 10 Nozzle duct 12 Nozzle inlet 12a Inlet portion 14 Nozzle outlet 14a Outlet portion 16a Rotation portion 17 Wall surface 17a Area portion 18 Mounting interface 20 Flow cross section 30 Bending axis 40 Axis of rotation 70 Bearing device 100 Suction device 110 Suction nozzle 120 Blower 130 Suction duct 200 Film web 210 Waste strips 300 Production machine F Conveyance direction