Method and device for removing foreign particles from a tobacco stream
Method and device for removing foreign bodies from a first tobacco stream that is conveyed via an air flow in a region of a first foreign body detection device. Method includes detecting, with a first foreign body detection device, the foreign bodies in the first tobacco stream based on at least one property, and removing, with a jet of compressed air, the foreign bodies from the first tobacco stream. In this manner, a foreign body freed tobacco stream and a second tobacco stream including tobacco particles and the foreign bodies entrained by the jet of compressed air are formed. Method also includes at least one of: accelerating the second stream at a distance from the first tobacco stream; and detecting, with a second foreign body detector, foreign bodies in the second stream based on at least one property and removing the detected foreign bodies with a second jet of compressed air.
1. A method for removing foreign bodies from a first tobacco stream that is conveyed via an air flow in a region of a first foreign body detection device, comprising:
detecting, with a first foreign body detection device, the foreign bodies in the first tobacco stream based on at least one property;
removing, with a jet of compressed air, the foreign bodies from the first tobacco stream, whereby a foreign body freed tobacco stream and a second tobacco stream comprising tobacco particles and the foreign bodies entrained by the jet of compressed air are formed;
accelerating the second stream at a distance from the first tobacco stream through tapering channel; and
detecting, with a second foreign body detector, foreign bodies in the second stream based on at least one property and removing the detected foreign bodies with a second jet of compressed air.
2. The method in accordance with claim 1 , further comprising adding the second tobacco stream, after the detected foreign bodies in the second stream have been removed, to the first tobacco stream at a location upstream of the first foreign body detection device.
3. The method in accordance with claim 1 , wherein the second stream is accelerated by a reduction in volume in a discharge evacuation channel for the second stream.
4. The method in accordance with claim 3 , wherein the second stream is accelerated upstream of the second foreign body detection device.
5. The method in accordance with claim 1 , further comprising controlling or regulating a conveyor speed of the first tobacco stream in the region of the first foreign body detection device.
6. A device for removing foreign bodies from a first tobacco stream, comprising:
a first foreign body detection device;
a feed device structured and arranged to feed the first tobacco stream to the first foreign body detection device via a compressed air source;
a first foreign body ejection device located downstream of the first foreign body detection device and having a first nozzle device structured and arranged to remove foreign bodies from the first tobacco stream with compressed air;
an evacuation channel being structured and arranged to guide a second stream formed by tobacco particles and the foreign bodies entrained by the compressed air of the first foreign body ejection device and having a tapering portion in which the second stream is accelerated; and
a second foreign body detection device and a second foreign body ejection device located downstream of the second foreign body detection device, the second foreign body ejection device having a second nozzle device structured and arranged to remove the foreign bodies from the second stream.
7. The device in accordance with claim 6 , wherein the evacuation channel directly adjacent to the feed device is formed in a tapering manner.
8. The device in accordance with claim 6 , wherein the evacuation channel directly adjacent to the feed device is formed as a chamber in which a flow body is arranged.
9. The device in accordance with claim 6 , wherein the evacuation channel opens one of in or upstream of the feed device.
10. The device in accordance with claim 6 , further comprising a control or regulation device structured and arranged to control or regulate a conveyor speed of the first tobacco stream in a region of the first foreign body detection device.
11. The device in accordance with claim 10 , wherein the control or regulation device receives control input parameters including a frequency of a fan generating the conveying air flow.