Device in spinning preparation, ginning, or the like for detecting and removing foreign substances in or between fiber material, especially cotton.

Abstract

Device in the spinning preparation or ginning process for detecting and removing foreign materials in or between fiber material, in particular cotton, comprising a fiber transport line (2; 37; 46b; 53) through which a conveying air stream (A) can flow, and on which, in a transport direction, a sensor system (7', 7'', 74) for detecting foreign materials and a removal device (13) with at least one compressed air nozzle (blast air C) (14, 67) acting transversely to the fiber transport line (2; 37; 46b; 53) are arranged one after the other, wherein the fiber transport line (2; 37; 46b; 53) has a first opening (17) opposite the compressed air nozzle (14, 67) which leads to a removal chamber (15), and the blast air (C) from the at least one compressed air nozzle (14, 67) is drawn from the removal chamber (15) in a closed system. through a further opening (19) can be reintroduced to the conveying airflow (A), wherein the discharge chamber (15) is integral with the fiber transport line (2; 37; 46b;53) is connected and the blown air (C) passes through a filter or sieve (20) before being returned to the conveying air stream (A), characterized in that the separation chamber (15) is connected to a waste removal device which conveys the separated material into a waste extraction system (22), wherein the waste removal device is designed as a rotary valve (18).

Description

[0001] The invention relates to a device in spinning preparation, ginning or the like for detecting and removing foreign materials in or between fiber material, in particular cotton, with a fiber transport line on which, in the transport direction, a sensor system for detecting foreign materials and a removal device with at least one compressed air nozzle (blast air) acting transversely to the fiber transport line are arranged one after the other, wherein the fiber transport line has a first opening opposite the compressed air nozzle, which leads to a removal chamber which is connected to a waste removal device and the blast air from the at least one compressed air nozzle can be fed back into the conveying air stream from the removal chamber through a further opening in a closed system.

[0002] In practice, a key requirement for foreign part separators in spinning preparation machines as well as in similar machines in the gin process is that the detected foreign parts must be removed with as little good fiber loss as possible and reliably.

[0003] In such foreign matter separators, the material to be inspected, cotton or synthetic fibers, is pneumatically conveyed in a rectangular channel and passed by the detection sensors, e.g., camera systems, in a presentation chamber. The detected foreign matter is then separated, for example, via a blow bar into a waste chamber. Within this blow bar, a series of discharge valves are arranged, which can be selectively controlled by the detection device in terms of both width and timing. Key parameters for reliable separation are the number of activated valves, the required delay time, and the holding time.

[0004] The number of activated valves is determined by the potential crossflow of material from the detection point to the discharge point. The delay time and the holding time are determined by the velocity of the foreign particles. The varying velocities of the foreign particles, in particular, are responsible for the often needing to be a long holding time to reliably hit passing particles.

[0005] However, the high number of activated valves and long holding time required for safe separation also mean a high loss of good fibers, which arises because many good fibers are conveyed into the waste chamber along with the actual foreign parts.

[0006] In state-of-the-art foreign matter separators, the distance between the detection device and the separation device is therefore kept as small as possible in order to minimize the number of valves to be activated, the holding time, and thus the loss of good fiber.

[0007] A second factor reducing separation efficiency is that a high number of valves and long holding times result in a large amount of air being drawn into the waste chamber, leading to a pressure increase within it and consequently to a backflow of air into the conveying channel. There is a risk that foreign matter already separated will be carried back into the conveying channel by this backflowing air.

[0008] Devices with retention systems made of sheet metal, pressure equalization channels, or intermittently operating flap systems are known. The latter aim to remove foreign matter that has already been separated and is located in the waste chamber. For this purpose, a flap is opened, for example, to pneumatically extract the material from the waste chamber. However, to prevent further material from the conveying channel from being drawn into the waste chamber at this time, another flap must be opened to supply fresh air into the waste chamber. A significant disadvantage of this solution is that during the emptying of the waste chamber, the removal of further foreign matter into the waste chamber is considerably hindered by the altered pressure conditions. Therefore, to keep the intervals between emptying the waste chamber long, the waste chamber is designed to be correspondingly large.

[0009] Another well-known option is to continuously extract waste material from the conveying channel. However, to prevent good fiber material from being drawn into the waste chamber, a fresh air supply to the waste chamber is necessary, as is adjusting the volume of exhaust air to the pressure conditions in the conveying channel. This is difficult in practice due to fluctuating conditions and can also limit the possible air volume in the conveying channel.

[0010] Ultimately, both of the aforementioned methods have in common that the distance between the detection device and the ejection device must be kept small to ensure proper function.

[0011] Particularly in machines where, due to their use or design, the distance between detection and rejection cannot be chosen to be small, or where difficult air conditions exist, the above arrangements do not lead to acceptable solutions because, among other things, the number of valves and the holding time must be chosen to be large in order to hit the foreign parts, and thus many already rejected foreign parts are flushed back into the channel.

[0012] In a known device (EP 0 989 214 A1), the waste container has means for the temporary, controlled extraction of air from the waste container. For controlled air extraction, the air extraction opening on the waste container is closed with a non-return valve during normal operation. The air extraction opening also leads to a return line, which in turn connects the waste container to the fiber transport line. Alternatively, the return line can also be connected to a drain. To extract air from the waste container when a compressed air pulse is triggered at the compressed air nozzle, an air conveyor or injector is actuated. This is connected to a compressed air line via a valve. The valve receives control signals from the control device, and opening the valve creates a suction effect in the direction of the arrow.Other suitable means, such as fans, could also be used to extract air from the discharge container, although in some cases controlled closure of the air outlet may be necessary. This device is complex to install, particularly due to the control unit. A particular drawback is the additional dependence on a significant discharge process for the control system. Finally, the amount of extracted air must be precisely controlled to avoid negatively impacting the air balance, which could lead to undesirable operational disruptions.

[0013] From DE 296 04 552 U1, a device in a spinning preparation plant for detecting and removing foreign matter from fiber material transported in an airflow through a fiber transport line is known. It includes an optical sensor system for detecting the foreign matter and a downstream compressed air nozzle for removing it. The compressed air pulse emitted by the nozzle for removing the foreign matter flows through a first opening, formed in a wall of the fiber transport line opposite the nozzle, into a removal chamber and then through this chamber to a second opening in the wall of the fiber transport line. Due to gravity, the foreign matter falls onto an outer surface of the fiber transport line located between the first and second openings.

[0014] WO 02 / 066 717 A1 discloses a device in a spinning preparation plant for detecting and removing foreign material from fiber material that is transported through a fiber conveying line in an airflow after passing through an opener roller. The device includes an optical sensor system for detecting the foreign material and a downstream blow-out nozzle for removing it. Detected foreign material is discharged via an air pulse from the blow-out nozzle through an opening into a container. The container can be closed or connected to the atmosphere via appropriate openings. It is also possible to equip the container with suitable extraction devices for removing the separated material.

[0015] From EP 0 987 355 A1, a device for detecting and removing foreign material from a stream of pneumatically conveyed material is known, comprising: a channel for conveying the material by means of a conveying gas stream with at least one discharge opening, cameras for detecting foreign material, and a nozzle for generating a transverse pressure pulse to eject the foreign material through the discharge opening. A collection container for receiving any foreign material that may be discharged through the discharge opening is provided below the discharge opening. The collection container is fluidically connected to the channel only via the discharge opening. The collection container is equipped with a sluice gate that allows the removal of foreign material.

[0016] The invention is therefore based on the objective of creating a device of the type described above which avoids the aforementioned disadvantages, which is in particular simple in design and enables a safe separation of foreign substances from the fiber material stream without impairing the air balance.

[0017] This problem is solved by the characterizing features of claim 1.

[0018] By directly recirculating the blown air from the separation chamber into the conveying air stream, balancing the air volume and pressure is achieved in a particularly simple manner. In contrast to known devices, complex and failure-prone control systems that also require precise adjustment are absent. Because a filter, screen, or similar device is located between the separation chamber and the fiber transport line, allowing only the return air, but not the foreign matter, to pass through, the separation of foreign matter is achieved simply and reliably, and contamination of the conveying air stream is prevented. No adjustment of the discharge air volume is necessary. The device according to the invention enables continuous operation and thus high efficiency in foreign matter removal, even with small waste chamber heights and large distances between the detection and separation devices.The integral connection of the excretion chamber to the fiber transport line allows for a compact design. This saves space while simultaneously creating a highly functional unit.

[0019] Claims 2 to 49 contain advantageous further developments of the invention.

[0020] The invention is explained in more detail below with reference to exemplary embodiments shown in the drawings.

[0021] It shows: Fig. 1 the device according to the invention on a foreign part detection and rejection device with a vertical transport channel, Fig. 2 the device according to the invention with flow pattern of the deflected blown air stream, Fig. 2a a detailed view from Fig. 2 in the area of ​​the pressure equalization screen; Fig. 3 a partially cut-away, schematic side view of an egrenier machine with the device according to the invention, which is located in the connecting channel between the egrenier machine and the baler, Fig. 4 the device according to the invention according to a four-roller cleaner, Fig. 5 the device according to the invention according to a single-roller cleaner, Fig. 6 the device according to the invention on a horizontal transport channel, wherein the second opening is arranged upstream of the first opening, Fig. 7 the device according to the invention on a horizontal transport channel, wherein the second opening is arranged downstream of the first opening, Fig. 8 Top view of a blow-off device with a plurality of blow-off nozzles arranged across the width, Fig. 9 Block diagram of an electronic control and regulating device to which two sensor systems and a blow-out device are connected and Fig. 10 a version like Fig. 6, in which an optical sensor system is assigned to the upstream-arranged opening roller.

[0022] After Fig. In housing 1, a vertically arranged channel 2 is present. The opposing parallel side walls 2', 2'' are at least partially designed as transparent discs. Lighting elements are assigned to the side walls 2', 2'' on both outer sides.

[0023] A first detector assembly 3 comprises two CCD cameras 4', 4'' (line cameras) which indirectly illuminate the glass channel 15 via two deflecting mirrors 5' and 5'' arranged at an angle. The optical planes are slightly offset from each other. An illumination 6' is located on the side of the channel 2 opposite camera 4', and another illumination 6'' is located on the side of the channel 2 opposite camera 4''. In this way, the material in the glass channel 15 is detected from two sides by the two cameras 4', 4''.

[0024] The housing 1' comprising the glass channel 15, the cameras 4', 4'', the deflecting mirrors 5', 5'', and the illuminations 6', 6'' forms a first detection module 7'. Here, colored foreign material in and between the cotton is detected in particular.

[0025] Below the first detection module 7', there is a second detection module 7''. The cross-sections of channel 2 are the same.

[0026] A second detector assembly 8 comprises a CCD camera 9, which indirectly illuminates the glass channel 16 via an angled deflecting mirror 10. On the side of the channel 2 facing away from the camera 9, there is an illumination unit 11 with polarizing filters (see figure). Fig. 2) and on the side of channel 2 facing camera 9, an illumination 12 for UV light is arranged. The polarized light (transmitted light) and the light reflected as a result of UV irradiation (incident light) are recorded together by the single CCD camera 9. The material in the glass channel 16 is illuminated from two sides, with transmitted light and with incident light.

[0027] The housing 1'' comprising the glass channel 16, the camera 9, the deflecting mirror 10, and the illumination devices 11, 12 forms a second detection module 7''. Here, light or transparent plastics in or between cotton are detected in particular.

[0028] Below the second detection module 7'' a rejection module 13 is provided. The rejection module 13 in the housing 1''' comprises a nozzle bar 14, which is assigned to a side wall of the channel 2. The nozzle bar 14 (see Fig. 7) A collection container 15 for the impurities blown out of the conveying stream is assigned to the opposite side wall of the channel 2 and is suctioned.

[0029] The wall of the fiber transport line 2 has a first opening 17 opposite the nozzle bar 14, which acts transversely to the fiber transport line 2. This opening leads to the discharge chamber 15, which is connected to a rotary valve 18 as a discharge device. The blown air B from the nozzle bar 14 can be returned to the conveying air stream A in a closed system from the discharge chamber 15 through a further opening 19 in the wall of the fiber transport line 2. This further opening 19, which is arranged upstream of the first opening 17, is closed by a screen 20 that only allows the passage of the returning blown air B. In this way, the discharge chamber 15 is integrally connected to the fiber transport line 2.

[0030] The blown air, which exits at high speed from the nozzles of the nozzle bar 14, enters the interior of the fiber transport line 2 through an opening in the wall of the fiber transport line 2 (not shown) and exits the interior of the fiber transport line 2 through the first opening 17.

[0031] Fig. 2 shows an arrangement like Fig. 1, in which the components blow bar 14, conveying channel 2, pressure equalization screen 20 and rotary valve 18 are arranged around the waste chamber 15.

[0032] The pressure pulse(s) triggered by the valves arranged in the blow bar 14 convey the foreign matter and the entrained material fibers into the waste chamber 15. Due to the design of the waste chamber 15, the incoming air is forced into a vortex C in the rear area of ​​the waste chamber 15, so that the moving air directly impacts the pressure equalization screen 20 located on the shaft wall of the conveying channel 2 and from there re-enters the channel 2. Additionally, a retaining plate 21 prevents the air from rising back up into the channel 2, thus eliminating the risk of foreign matter being flushed back into the conveying channel 2.The foreign matter and the good fiber material carried into the waste chamber 15 by the pressure pulse and the entrained air either collide with the inclined front boundary 15a of the waste chamber 15 and slide into the rotary valve 18, or are transferred directly to the rotary valve 18 in the lower part of the vortex C due to gravity. The rotary valve 18 rotates continuously (arrow 18a) and conveys the separated material into the waste extraction system 22, thus creating an air separation between the disposal air and the conveying air in the duct 2, so that they do not need to be coordinated.

[0033] Reference numeral 23 denotes a channel-like inlet into the waste chamber 15. The retaining element 21 is designed as a guide element for the blown airflow B and has an open end at one end. Following this open end, the guide element 21, e.g., a sheet metal, is segmented (or curved) and forms a wall surface of the channel inlet 23. Opposite the segmented (or curved) end region of the guide element 21, the wall surface 15a of the waste chamber 15 is also segmented (or curved). In this way, the blown airflow B entering the waste chamber 15 is forced into a bend, forming a vortex C that flows towards the second opening 19 or the sieve 20. Reference numerals 15b and 15c denote the wall surfaces of the waste chamber 15 that taper conically towards the rotary valve 18.

[0034] According to the Fig. Figure 3 shows a separating machine 45 in a gin connected to a baler 47 via a channel 46. The mixture of exposed cotton fibers and seeds, etc., is conveyed from the separating machine 45 into the channel section 46a using compressed air. The cleaned cotton fibers then pass through the device 48 for separating waste particles (trash, sand, etc.) from the cotton fibers via the channel section 46b into the channel 49 of the baler 47. The device according to the invention is arranged in the vertical channel section 46b and consists of – viewed in the direction of material flow – a second detection module 7'' (for plastic fiber foreign matter), a first detection module 7' (for colored foreign matter), and a separation module 13. (The arrangement corresponds to that shown in Figure 48.) Fig. 4 training shown for a cleaner.)

[0035] Accordingly Fig. 4 The device according to the invention is arranged downstream of a cleaner 50, e.g., Trützschler CL-C4. The fiber material is removed from the last high-speed, garnished roller 514 by an airflow E (air docking) and enters a channel 52 as a fiber-air flow A. This channel is approximately U-shaped, one leg of which transitions upwards into a vertical channel 53. The fiber-air mixture A flows through the channel 53 from bottom to top. The device according to the invention is associated with the channel 53 and consists of – viewed in the material flow direction A – a second detection module 7'' (for plastic foreign matter), a first detection module 7' (for colored foreign matter), and a separation module 13 (comprising a blow-off device 14, a suction unit, and a return air intake). The fiber-air mixture A, freed from foreign matter, is then fed to further processing.

[0036] According to Fig. In Figure 5, the device according to the invention is arranged downstream of a cleaner 54, e.g., a Trützschler CL-C1. The fiber material is removed from the high-speed, garnished roller 55 by the airflow E (air docking) and enters an inclined channel 56 as a fiber-air flow A. This channel transitions upwards via a curved section into a vertical channel 53. The fiber material A flows through the channel 56 and the channel 53 from bottom to top. The device according to the invention is associated with the channel 53. In contrast to the embodiment according to... Fig. 4 is accordingly Fig. 5 - viewed in the material flow direction A - first a first detection module 7' and then a second detection module 7'' are assigned, followed by the rejection module 13.

[0037] Accordingly Fig. 6 is associated with the upper inlet opening of a filling chute 60 with a device for the pneumatic supply of a fiber-air stream H, which includes a fiber material transport fan (not shown), a stationary air-permeable surface 61 for separating (separating) the fiber material I from air K with air discharge, and an airflow guidance device 62 with movable elements, wherein the fiber material present in the airflow is guided reversibly back and forth transversely across the air-permeable surface 61, and the fiber material falls from the air-permeable surface 61 after impact, essentially by gravity, and enters the filling chute 60 downwards. The slow-running rollers 63a, 63b have a dual function; they serve as discharge rollers for the fiber material I from the filling chute 60 and simultaneously as feed rollers for feeding the fiber material I to a fast-running opener roller 64.The filled arrows represent fiber material, the empty arrows represent air, and the half-filled arrows represent an airflow with fibers.

[0038] A stream of blown air E flows through a channel approximately tangentially to the opening roller 64, detaches the fiber covering (good fibers) from the garnish and flows as a fiber-air stream A through a fiber transport line 37 through two glass channels arranged one behind the other, which are located in the horizontal area of ​​the fiber transport line 37 and not immediately after the opening roller 64.

[0039] The device according to the invention is associated with the pneumatic fiber transport line 37. The device is suitable for detecting and separating any foreign materials, e.g., pieces of fabric, tapes, cords, pieces of film, and the like, in fiber material. Viewed in the material flow direction, there is first a first detection module 7' and then a second detection module 7'', to which the separation module 13 is arranged.

[0040] The detection module 7' is used to detect foreign materials, particularly those with brightness and / or color deviations. The optical system with cameras 4', 4'' (only 4' shown) is located above channel 37 and to the side of the filling chute 61. This results in a compact, space-saving design. The color line cameras 4', 4'' are directed towards the glass channel 15 and are capable of detecting colored foreign materials, e.g., red fibers, within the fiber material. The cameras cover the entire area across the width of channel 37. The downstream detection system 7'' is used to detect foreign plastic parts, such as polypropylene tapes, fabrics, and films, etc., in or between fiber flakes, e.g., made of cotton and / or synthetic fibers. The plastics are light-colored, white, or transparent. Above the fiber transport line 37, across the machine width, the cameras are positioned to detect foreign materials. B. 1600 mm, two cameras 9', 9'', e.g.Diode line cameras with polarizing filters are arranged in a housing. Below cameras 9', 9'' (only camera 9' is shown), the wall surfaces of the fiber optic cable 37 have two transparent areas in the form of two parallel, opposing glass panes (glass windows) forming a glass channel 16. A lighting device 11 is located below the fiber optic cable 37 as a source of polarized light. A further lighting device 12 is located above the fiber optic cable 37 as a source of ultraviolet (UV) light. Downstream of the detection system 7'', an ejection module 13 with a nozzle bar 14 (blowing device) for generating a blowing air stream is arranged. The nozzles of this blowing air stream are oriented towards the channel 37 such that a brief, sharp jet of air flows approximately perpendicular to the channel 37.The first detector unit and the subsequent detector unit are connected via an evaluation unit and an electronic control and regulation unit 71 (see . Fig. 9) in connection with the blow-off device to which a valve control is assigned (see Fig. 9) If the cameras detect a colored or transparent foreign substance in the fiber material based on reference or target values, a short burst of high-velocity air is expelled via the valve control towards channel 37. This expulsion forces the foreign substance, along with a few fibers, out of fiber stream A with a blowing air stream and then carries it away through a suction channel. The fiber air stream A is extracted after the blowing device through fiber transport line 37 and fed to further processing.

[0041] According to Fig. In the horizontal transport channel 37, the second opening 19 is arranged upstream of the first opening 17.

[0042] After Fig. In the horizontal transport channel 37, the second opening 19 with the sieve 20 is arranged downstream of the first opening 17.

[0043] According to Fig. The blow-out device 14 comprises a plurality of blow-out nozzles 67a to 67n, each of which is associated with a valve 68a to 68n. The blow-out nozzles 67a to 67n are connected via the valves 68a to 68n to a common compressed air line 69, which is connected to a compressed air source 70. The fiber transport line, designated by 2, has inlet openings in its wall surface 2' for the blow-out nozzles 67a to 67n. The outlet opening 17 for the blow-out air streams B into the collection container 15 is located in Fig. Figure 1 shows that the valves 68a to 68n are selectively controlled via a valve control system. For example, if the foreign substance 23' is present, the valve 68d is briefly opened, so that a sharp, high-speed airflow, e.g., Mach 1, exits through the nozzle 67d for a short duration (milliseconds) and carries the foreign body 23' into the suctioned collection container 15 (see Figure 1). Fig. 1) blows.

[0044] Accordingly Fig. 9 are connected to an electronic control and regulating device 71 the cameras 4, 9, an image evaluation device 26 and a valve control 73 for the valves 68a to 68n of the blow-off device 14.

[0045] Fig. 10 shows a version like Fig. 6, in which, however, instead of the detection module 7' arranged downstream of the opening roller 64, an optical sensor system 74 is assigned to the opening roller 64 itself. The sensor system 74 can be connected to the electronic control and regulating device 71 ( Fig. 9) be connected. The optical sensor system 74, e.g., a line-scan camera (CCD camera) with electronic evaluation unit for detecting foreign materials, especially those with brightness and / or color deviations, is assigned to the total surface area of ​​the opening roller 64. The sensor system 74 with the camera, e.g., a color line-scan camera, is arranged obliquely above the opening roller 64, close to the outer wall of the filling chute 60. This results in a compact, space-saving design. The color line-scan camera 74 is directed towards the assembly of the opening roller 64 and is able to detect colored foreign materials, e.g., red fibers, in the fiber material. The camera 74 covers the entire area across the width of the opening roller 64, e.g., 1600 mm. The opening roller 64 rotates counterclockwise in the direction of the curved arrow.The sensor system 74 is connected via an evaluation unit and the electronic control unit 71 to the device 13, which is assigned a valve control 39. If the camera 74 detects a foreign substance in the fiber material on the garment surface based on comparison or target values, a short burst of air at high speed is expelled via the valve control 39 towards the discharge chamber 15, which removes the foreign substance 23' from the airflow A (see . . Fig. 8) blows out with a few fibers, which is removed through the rotary valve 18. The blown airflow C is deflected in the discharge chamber 15 and fed back into the conveying airflow A through the further opening 19.

Claims

[1] Device in spinning preparation or ginning for detecting and removing foreign materials in or between fiber material, in particular cotton, comprising a fiber transport line (2; 37; 46b; 53) through which a conveying air stream (A) can flow and on which, in a transport direction, a sensor system (7', 7'', 74) for detecting foreign materials and a removal device (13) with at least one compressed air nozzle (blowing air C) (14, 67) acting transversely to the fiber transport line (2; 37; 46b; 53) are arranged one after the other, wherein the fiber transport line (2; 37; 46b; 53) has a first opening (17) opposite the compressed air nozzle (14, 67) which leads to a removal chamber (15), and the blowing air (C) from the at least one compressed air nozzle (14, 67) is discharged from the removal chamber in a closed system (15) can be returned to the conveying airflow (A) through a further opening (19), wherein the discharge chamber (15) is integral with the fiber transport line (2; 37; 46b;53) is connected and the blown air (C) passes through a filter or sieve (20) before being returned to the conveying air stream (A), ; characterized by , that the excretion chamber (15) is connected to a waste removal device which conveys the excreted material into a waste extraction system (22), wherein the waste removal device is designed as a rotary valve (18). [2] Device according to claim 1, characterized by , that the excretory chamber (15) is an excretory container. [3] Device according to claim 1 or 2, characterized by , that the excretory chamber (15) is largely pressure-tight. [4] Device according to any one of claims 1 to 3, characterized by , that the further opening (19) is provided for the compensation of the amount of air blown into the excretion chamber (15) during the excretion process. [5] Device according to any one of claims 1 to 4, characterized by, that the excretion chamber (15) is directly short-circuited with the fiber transport line (2; 37; 46b; 53). [6] Device according to any one of claims 1 to 5, characterized by , that the excretion chamber (15) connects directly to the fiber transport line (2; 37; 46b; 53). [7] Device according to any one of claims 1 to 6, characterized by , that the excretory chamber (15) and the fiber transport conduit (2; 37; 46b; 53) have a common wall. [8] Device according to claim 7, characterized by , that the further opening (19) with the filter or sieve (20) is present in the common wall. [9] Device according to claim 8, characterized by , that the further opening (19) with the filter or sieve (20) allows the passage of the return air. [10] Device according to any one of claims 1 to 9, characterized by, that a guide element (guide plate) (21) with an open end is connected to the first opening (17) for the passage of the blown air (C). [11] Device according to claim 10, characterized by , that the guiding element (21) is able to direct the blown air (C) into the excretion chamber (15). [12] Device according to one of claims 10 or 11, characterized by , that the guide element (21) has a curved shape adjacent to the open end. [13] Device according to any one of claims 10 to 12, characterized by , that the guiding element (21) is segment-shaped following the open end. [14] Device according to any one of claims 10 to 13, characterized by , that the guiding element (21) forms a channel with an opposite wall surface (15a). [15] Device according to claim 14, characterized by , that the wall surface (15a) opposite the end area of ​​the guiding element (21) is curved. [16] Device according to one of claims 14 or 15, characterized by , that the wall surface (15a) opposite the end area of ​​the guiding element (21) is segment-shaped. [17] Device according to any one of claims 14 to 16, characterized by , that the blown air (C) is able to impact the wall surface (15a) opposite the guiding element (21). [18] Device according to any one of claims 1 to 17, characterized by , that the rotary valve (18) is designed to rotate continuously. [19] Device according to any one of claims 1 to 18, characterized by , that the blown air (C) entering the excretion chamber (15) through the first opening (17) is forced into a vortex. [20] Device according to any one of claims 1 to 19, characterized by , that the excretory chamber (15) is connected to an outflow pipe. [21] Device according to claim 20, characterized by, that the rotary valve (18) is arranged between the excretion chamber (15) and the discharge line. [22] Device according to one of claims 20 or 21, characterized by , that the outlet pipe is connected to the waste extraction system (22). [23] Device according to any one of claims 1 to 22, characterized by , that the sensor system (7', 7'', 74) is connected to the ejection device (13) via an evaluation unit and a control unit (71). [24] Device according to any one of claims 1 to 23, characterized by , that fiber flakes can be conveyed into an airflow through the fiber transport line (2; 37; 46b; 53). [25] Device according to any one of claims 1 to 24, characterized by , that the sensor system (7', 7'', 74) is an optical sensor system. [26] Device according to any one of claims 1 to 25, characterized by , that the sensor system (7', 7'', 74) is assigned to the fiber transport line (2; 37; 46b; 53). [27] Device according to any one of claims 1 to 26, characterized by , that the discharge device (13) is assigned to the fiber transport line (2; 37; 46b; 53). [28] Device according to any one of claims 1 to 27, characterized by , that the filter or sieve (20) is so fine that foreign substances cannot pass through. [29] Device according to any one of claims 1 to 28, characterized by , that the filter or sieve (20) has a mesh size (fineness) of approximately 0.1 to 0.3 mm. [30] Device according to any one of claims 1 to 29, characterized by , that the filter or sieve (20) is made of stainless steel. [31] Device according to any one of claims 1 to 30, characterized by , that the filter or sieve (20) is attached to a perforated sheet. [32] Device according to any one of claims 1 to 31, characterized by , that the filter or sieve (20) is a wire mesh. [33] Device according to any one of claims 1 to 32, characterized bythat the device is located in a gin factory. [34] Device according to any one of claims 1 to 33, characterized by that the device is arranged after a bale opener. [35] Device according to any one of claims 1 to 34, characterized by that the device is arranged after a cleaning device. [36] Device according to any one of claims 1 to 35, characterized by that the device is arranged in front of a carding machine. [37] Device according to any one of claims 1 to 36, characterized by that the device is arranged downstream of a foreign fiber separator. [38] Device according to any one of claims 1 to 37, characterized by , that the fiber transport line (2; 37; 46b; 53) is arranged vertically. [39] Device according to any one of claims 1 to 37, characterized by , that the fiber transport line (2; 37; 46b; 53) is arranged at an angle. [40] Device according to any one of claims 1 to 39, characterized by , that the fiber material is conveyed from top to bottom through the fiber transport line (2; 37; 46b; 53). [41] Device according to any one of claims 1 to 39, characterized by , that the fiber material is conveyed from bottom to top through the fiber transport line (2; 37; 46b; 53). [42] Device according to any one of claims 1 to 37, characterized by , that the fiber transport line (2; 37; 46b; 53) is arranged horizontally. [43] Device according to any one of claims 1 to 42, characterized by , that a fan is provided as the conveying means, the pressure side of which is connected to an upper end of the fiber transport line (2; 37; 46b; 53). [44] Device according to any one of claims 1 to 43, characterized by that the device is of modular construction and that it has at least one detector module (sensor module) (7) and one ejection module (13). [45] Device according to any one of claims 10 to 44, characterized by , that the components arranged in the discharge chamber (15) guide element; filter or sieve (20) and rotary valve (18) interact in such a way that air set in motion by the blow pulse hits the filter or sieve (20) connected to the fiber transport line (2; 37; 46b; 53) through a vortex and can return to the fiber transport line (2; 37; 46b; 53) and the foreign parts and good fibers conveyed by the blow pulse are transferred to the continuously operating rotary valve (18) and thus disposed of. [46] Device according to any one of claims 1 to 45, characterized by , that the excretion chamber (15) is directly connected to the fiber transport line (2; 37; 46b; 53). [47] Device according to any one of claims 1 to 46, characterized by , that in the fiber transport line (2; 37; 46b; 53) the further opening (19) is arranged downstream of the first opening (17). [48] ​​Device according to any one of claims 1 to 46, characterized by , that in the fiber transport line (2; 37; 46b; 53) the further opening (19) is arranged upstream of the first opening (17). [49] Device according to any one of claims 1 to 48, characterized by , that the sensor system (74) for detecting foreign substances is assigned to a high-speed opening roller (64).

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