EP1959039A2 - Interception device for foreign material - Google Patents

Abstract

The assembly to detect and remove foreign matter from fiber materials has fiber feeds (14, 15), and a cleaning stage (1) where a loosening roller (4) opens out the fiber material to be passed through one or more separators (5) and then into a feed channel (24). The detection/separation system (32, 33) is located directly at the transfer zone (20, 24) into the cleaning stage.

Description

The invention relates to a device for detecting and eliminating foreign substances from a fiber material which is fed via feed elements of a cleaning stage, wherein the fiber material is guided by means of a Öffnerwalze via one or more Abscheidemittel and delivered to a subsequent conveyor channel.

From the DE-A1-19518 783 an embodiment is known, wherein a Öffnerwalze, which is occupied with pins or hooks, cooperates with Ausscheidemessern which are arranged on a partial circumference of the roller at intervals. In the transfer of the fiber material on the Ausscheidemesser be - with respect to the fiber weight - especially heavier and undesirable components such as dirt, trash, dust and the like from the fiber material deposited. The fiber is discharged via a shaft and two feed rollers to the surface of the Öffnerwalze. In order to detect foreign fibers in the fiber material guided via the opening roller, sensors are proposed which are arranged opposite the surface of the opening roller. These are color sensors, which are arranged over the working width of the roller. The color sensors determine a color deviation of the foreign fibers relative to the normal fiber and are connected to an evaluation electronics. For detecting the foreign fibers, the surface of the opening roller may have a metallic shiny or white surface. The cleaned fiber material is delivered to a suction line, in which a discharge device is integrated. In this case, using the signals of the sensors are operated time-displaced in a certain time interval hinged flaps, which supply the fiber material provided with foreign fibers a disposal line. The ejection device shown is relatively far from the actual delivery of the Opener roller removed, so that a larger fiber mass must be discharged, so that in this process, the detected foreign fibers are removed.

When monitoring the fiber material on the occupied with a set or pins opener roller, the circumferential tips of the set, or the pins, adversely affect an exact detection of foreign fibers. This means that the foreign fibers, which are located directly in the area of these tips, may not be detected by the sensors as foreign fibers, especially as the process pattern of the clothing tips in the evaluation electronics is filtered out.

Moreover, in this case, the fiber material is in the transfer to the opener roller as a relatively compact fiber fleece, which may not be detected inside, directly guided on the drum circumference foreign fibers.

Furthermore, from the DE-A1-195 43 526 an opening roller known, which also cooperates with Ausscheidemessern. In this case, for the separation of detected foreign fibers in the area before a Ausscheidemesser an air accumulation is generated, wherein the interspersed with foreign parts fiber material is lifted from the roller and transferred to a disposal facility. The monitoring for foreign fibers also takes place on the roll surface of the opening roller. In addition, many good fibers are also deposited in this device when discharging foreign fibers.

The DE-A1-198 47 237 shows a similar device, wherein for the separation of the foreign fibers detected on the drum, an approximately tangential to the roll directed Blasluftstrom is generated, wherein the resulting negative pressure on the roll surface in the region of the Blasluftstromes located fibers are lifted from the roll surface and fed to a disposal space. In the example shown, it is a Öffnerwalze, which has the task of further open the supplied fiber, or aufzuschliessen into smaller fiber flakes. An additional cleaning of the fiber material of contamination is not provided here. Even with this arrangement, there is the danger, as described above, that not all foreign fibers in the fiber material guided via the opener roller can be detected or removed.

From the DE-A1-195 16 568 is also only an opening roller to remove, on which no cleaning work is performed. The opening device consists of one or two feed rollers that deliver the fiber material supplied via a shaft to a high-speed opening roller. The fiber material further dissolved by the opening roller is fed in free fall to a downwardly guided shaft in which a device for detecting and separating foreign substances is mounted. The foreign substances detected via a plurality of juxtaposed sensors or a camera are blown out sequentially into a special collecting container via subsequently attached blast nozzles arranged in rows. These nozzles are controlled via a control unit, which is connected to the sensor. With the sensor, even contaminants, trash parts and the like which are still present in the fiber-material flow are thereby detected, as a result of which the blowing nozzles are very often controlled via the controller for blowing out. The blowing cone of the blast air flow must have an appropriate size so that the detected foreign substances are safely eliminated.

At each blowing interval, a large number of good fibers are also deposited in addition to the foreign substances. However, this has a loss in productivity of the recovered fiber.

The invention thus has the object to avoid the disadvantages of the prior art described, in order to obtain an optimal means for the targeted elimination of foreign substances and the elimination of good fibers is minimized.

This object is achieved in that the detection and separation device for the foreign substances is arranged directly in the discharge area of the cleaning stage.

The term "delivery area" is to be understood as meaning the area directly at the discharge opening of the cleaning stage or also the area which follows directly after the discharge opening. With this device it is ensured that the detection device (sensor) a Fasergutmasse is supplied in the free flake stream, from which conventional contaminants, such as Trash parts, dirt, dust and the like have already been deposited at the upstream cleaning stage in a conventional manner substantially. In addition, the foreign substances still to be detected in an open flock flow easier to detect, as between the set of an opening roller. By attaching directly in the delivery area of the cleaning stage, the fiber air flow has a speed at which the detection of foreign substances is still easily feasible. By the elimination of entrained in the fiber material contaminants already at the cleaning stage, the subsequent detection and separation can concentrate on the foreign matter, which are not deposited due to their physical property at the upstream cleaning stage.

Since the cleaning stage is essentially provided with a Öffnerwalze having a corresponding length, it is proposed that the discharge area - seen in the conveying direction - is designed as a tapered and funnel-shaped channel, which opens into the delivery channel. This will ensures that in the area of the cleaning stage, the fiber material can be guided over a correspondingly large cleaning surface, while for further transport of the cleaned fiber material on the funnel-shaped channel this can be merged on a narrower, tubular transport channel. This makes it possible to keep the energy required for the transport of fiber to a minimum.

Preferably, the detection and separation device is mounted on the funnel-shaped channel. As already described, the conveying speed of the fiber material in the funnel-shaped channel is lower than in the subsequent conveying channel, so that problem-free detection and separation of foreign substances can be carried out here.

In order to keep the fiber flow in the cross section between the detection and the discharge constant, it is proposed that the discharge area is provided in a first part with an approximately constant cross section, which is followed by a funnel-shaped part, which opens into the delivery channel. When attaching the detection and separation device in the region of the constant cross-section of the channel, the exact detection and elimination of foreign substances is ensured. This means that the position of the detected foreign substances remains approximately the same in the fiber flow between detection and elimination.

To detach the fiber material from the opener roller and to generate a subsequent transport air flow, it is proposed that a channel for air supply in the delivery direction is arranged in the delivery region.

Furthermore, an embodiment is proposed, wherein the detection device is arranged approximately tangentially in the discharge region of the cleaning stage at a distance from the assembly of the opening roller. This makes it possible To detect the foreign matter immediately in the field of detachment from the opening roll.

In addition, it is proposed that the sensor of the opposite wall of the cleaning stage following channel in a section as an optical background, eg. B. is designed as a reflection surface for the sensor, wherein the reflection surface is arranged approximately at a right angle to the monitoring plane. In this case, the reflection surface of the color of the fiber material (good fibers) can be adjusted, with an optimal detection of foreign parts is possible.

The optical background may be formed with defined properties in terms of brightness and color or may, for. B. actively light, in which case the optical background no longer acts in the sense of a reaction surface.

It is further proposed that the cleaning device mitanschliessender recognition and elimination device is integrated in the feed slot of a card.

The previously claimed sensors can be formed from one or more cameras. Furthermore, individual sensors for monitoring are possible. The sensor is preferably associated with a lighting device.

The separation device may be formed from adjacent blast nozzles, which are sequentially controlled via the sensor by a control unit.

Further advantages of the invention will be shown and described in more detail in the following exemplary embodiments.

Fig. 1

Eine schematische Seitenansicht einer Reinigungsstufe mit nachfolgender Erkennungs- und Ausscheidevorrichtung von Fremdstoffen.

Fig. 2

Eine Teilansicht X gemäss Fig. 1 des Abgabebereiches der Reinigungsstufe

Fig. 3

Eine schematische Seitenansicht einer Karde mit integrierter Reinigungsstufe im Speiseschacht und nachfolgender Erkennungs- und Ausscheidevorrichtung für Fremdstoffe.

Show it:

Fig. 1

A schematic side view of a cleaning stage with subsequent recognition and separation of foreign substances.

Fig. 2

A partial view X according to Fig. 1 the delivery area of the cleaning stage

Fig. 3

A schematic side view of a carding machine with integrated cleaning stage in the feed chute and subsequent detection and separation device for foreign substances.

Fig. 1 shows a cleaning stage 1, which is provided with a Öffnerwalze 4 and with Abscheidemessern 5, which are arranged over a portion of the circumference of the Öffnerwalze one behind the other. The fiber material, which is conveyed in the form of flakes by a transport air stream, is fed to the cleaning stage 1 via a feed chute 6.

The fiber material can be delivered from an upstream cleaning stage, in which, for example, a rough cleaning is performed. The cleaning stage 1 shown is then connected downstream of the "coarse cleaner" as a "fine cleaner".

In the feed chute 6, the fiber material enters the area of action of a Öffnerwalzenpaares 8. About the opening rollers 8, the fiber flakes are opened further and dispensed metered down, the fiber material passes into the nip of a wire roller 10 and a transport roller 11. The screen roller 10 and the transport roller 11 are connected to a drive not shown in detail, which drives them in the opposite direction of rotation, whereby the fiber material supplied from above between the two Rolling is passed. The transport roller 11 has a smooth surface, while the screen roller 10 has a perforated surface, wherein the interior of the screen surface is connected to a schematically shown channel 12, in which most of the transport air of the fiber air mixture is discharged.

The fiber material guided between the rollers 11 and 10 is still in flake form and enters the feed channel S of a subsequent feed roller 14, which cooperates with a feed trough 15.

Due to the funnel-shaped merging of the fiber material between the feed roller 14 and the feed trough 15, the fiber material is compressed and transferred in the region of the feed lip 16 to the schematically indicated set 7 of the revolving opener roller 4. When removing the fiber material in the region of the feed lip 16 through the clothing 7, the fiber flakes are opened further, whereby the entrained in the fiber material impurities such as dirt, Trashteile, etc. can escape from the Fasergutstrom by the resulting centrifugal force on the opening roller 4 to the outside.

As a result of the centrifugal force, these parts reach the region of the separating blades 5 and are deposited there and transferred to a disposal device (not shown).

Following the separating knife 5, a tray plate 18 is arranged, via which the cleaned fiber material is fed to a discharge opening 20. In the region of the discharge opening 20, a channel 22 is arranged, via which air L is supplied from an air pressure source not shown in detail. The air L is supplied approximately in the tangential direction to the opening roller 4 and supports the detachment process of the fiber material located in the clothing 7 of the opening roller 4.

The air L could also be supplied directly from the ambient air, which is sucked in by a negative pressure generated in the transport channel 26.

As a result, the fiber material is discharged to a delivery region or into a delivery tube 24 and transferred by the action of the air L into a subsequent transport channel 26. From this transport channel 26, for example, the fiber material is supplied to either a further cleaning stage or a subsequent feed chute of a carding machine.

As in particular in the partial view of Fig. 2 can be seen, the discharge pipe 24 is provided on its first portion 28 with a constant cross-section whose width B corresponds approximately to the length of the opening roller 4. The section 28 of the discharge pipe 24 opens into a in the transport direction T tapered, second section 30 (called "hopper"), which opens into the transport channel 26.

In the region of the first subsection 28, for example, two opposite CCD cameras 32, 32 'and 33, 33' are mounted in pairs behind the dispensing opening 20, each of which is integrated with a transparent window 35, 36 which is integrated in the subsection 28 Monitoring the output of the cleaning stage 1 fiber material.

In the section 28 are also attached background strips 38, which are positioned to the respective camera 32, 32 'and 33, 33' on the opposite side of the channel. The color of the background strip 38 corresponds to the set parameters for the fibers, so that the cameras do not respond when the partial section 28 is empty. A similar device is for example from WO-96/35831 refer to.

As in particular from Fig. 2 it can be seen, the respective cameras 32-33 'lighting fixture 40 are assigned, which provide sufficient illumination of the guided past the cameras fiber material.

Like also in Fig. 2 indicated schematically, the cameras 32-33 'via the paths 42, 42', 43 and 43 'connected to a control unit ST, via which the monitoring results of the control unit ST are transmitted. On the basis of the evaluation of the data transmitted to the control unit ST, a corresponding valve 48 is opened via the control line 45, wherein the compressed air supplied via a compressed air source 46 is released to a blower nozzle 50 assigned to the respective valve 48. About the resulting air pulse P detected foreign material (for example, foreign fibers) is discharged through an opening 52 to a container 54. The container 54 may be closed or connected to the atmosphere with corresponding openings. It is also possible to provide the container 54 with corresponding suction means for removing the deposited material. As shown in dashed lines, the container may also be provided with an air return 55, via which the air supplied to the container is returned to the section 30.

It is also an embodiment possible, wherein the blowing nozzles 50 may be disposed below the discharge pipe 24, wherein the detected foreign parts are blown up through a corresponding opening in the pipe 24. In such an arrangement, the collecting container must be designed or arranged accordingly, so that the excreted foreign parts can not get back into the channel 24.

It is also conceivable to chemically treat the fiber material even before reaching the monitoring device (32-33 ') in the region of the dispensing opening 20, so that even extraneous parts, such as plastic films, which normally do not differ from the color of the cotton , for the Monitoring system be made visible. (eg via UV light, if the sprayed-on chemical substance only sticks to the plastic films and can be visualized via UV light.)

With the detection and separation device arranged after the purification stage 1, in particular the extraneous parts are detected and separated, which due to their physical parameters can not be separated by the centrifugal force effect in the conventional purification stage 1.

In Fig. 3 a further embodiment is shown, wherein in the feed duct 58 of a carding machine 60 a Öffnerwalze 4 is rotatably arranged, which cooperates on a part of its circumference with a grate 56. The opener roller 4 is in this case also provided with a clothing 7, which subtracts the over the feed trough 15 in conjunction with the feed roller 14 presented fiber material and dissolves. Of course, also deposition knife 5 can be mounted instead of the shown Abscheiderostes 56, as in the embodiment of the Fig. 1 are shown.

The deposited over the grate 56 material is fed to a manifold 57 shown schematically. Through an opening 62 in the connection to the grate 56, the monitoring of the output of the cleaning stage 1 at the discharge opening 20 fiber material. The monitoring plane of the CCD camera shown extends approximately tangentially and at a small distance from the tips of the clothing 7. The subsequent channel 58 'has in the region of the discharge opening 20 on a presentation surface 64, which is aligned approximately at right angles to the monitoring plane E. The color of the surface 64 is chosen so that only a signal is generated by the camera 32 by foreign parts on the basis of the set fiber parameters in the control unit ST. As in the example of Fig. 1 , respectively Fig. 2 shown here, the captured by the camera 32 images via a path 42 transmitted to a subsequent control unit ST. As soon as a foreign material is detected, a control valve 48 is timed via the control unit ST, via which the compressed air supplied from a compressed air source 46 is switched through to a subsequent nozzle 50. Via the compressed-air impact P thus generated at the corresponding point within the duct 58 ', the detected foreign part is discharged or excreted into a container 54 via an opening 52.

The transport of the fiber material delivered by the cleaning stage 1 takes place here in the channel 58 'in free fall and is transferred to a subsequent transport roller pair 66. In the case of the transport rollers 66, the fiber material is compacted to form a fiber fleece 70 which is transferred via a feed table 68 sloping downwards to a subsequent feed roller 72, to which a feed trough 73 is assigned. About a provided with a set licker (Briseur) 76, the fibers are removed from the submitted nonwoven fabric 70 and transferred to a subsequent card drum 77 (drum). The drum 77 cooperates with a rotating cover 78, shown schematically, and transfers the fiber material, which has now been dissolved into individual fibers, to a following rotating taker 80.

In the region of the circumference of the drum 77, of course, there are also several carding elements, which, however, are not shown here. The fiber roll is removed from the pickup 80 via the pickup roller 81 and delivered to a subsequent squeeze roller pair 82. The nonwoven fabric delivered via the squeezing roller pair 82 is taken over, for example, by a cross conveyor belt 83, which brings the nonwoven fabric together to form a sliver F, which is transferred via a calender roller pair 84 to a subsequent sliver, not shown.

The use of such a cleaning stage with claimed according to the invention, directly subsequent recognition and separation device can be used in the cleaning line at any point between the Ballenabtragsmaschine and the cards.

Claims (7)

Device for detecting and separating foreign substances from a fiber material, which is supplied via feed elements (14, 15) to a cleaning stage (1), wherein the fiber material by means of a Öffnerwalze (4) via one or more Abscheidemittel (5, 56) guided and at a subsequent conveyor channel (24, 58 ') is discharged, wherein the detection and the separation device (32, 33, 50) for the foreign substances directly in the discharge area (20, 24, 58') of the cleaning stage (1) is arranged, characterized in that the monitoring level (E) of the recognition device (32) in the delivery area (20) of the cleaning stage (1) is arranged approximately tangentially at a distance from the assembly (7) (eg clothing) of the opening roll (4). Apparatus according to claim 1, characterized in that the sensor (32) opposite wall of the cleaning stage (1) following channel (58 ') formed in a section as an optical background, for example as a reflection surface (64) for the sensor (32) is, wherein the reflection surface (64) is arranged approximately at a right angle to the monitoring plane (E). Device according to one of claims 1 or 2, characterized in that the color of the reflection surface (64) of the color of the fiber material (good fibers) is adjusted. Device according to one of claims 1 to 3, characterized in that the cleaning device (1) in the feed shaft (58, 50 ') of a carding machine (60) is integrated. Device according to one of claims 1 to 4, characterized in that the sensor system of one or more cameras (32, 32 ', 33, 33') is formed. Apparatus according to claim 5, characterized in that the sensor is associated with a lighting device (40). Device according to one of claims 1 to 6, characterized in that the separation device is formed of juxtaposed blowing nozzles (50), which sequentially via the sensor (32, 32 ', 33, 33') via a control unit (ST) can be controlled.

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