EP0929704B1 - Dispositif de formation d'une nappe de fibres en bourre, en particulier pour le chargement d'une machine textile telle qu'une carde - Google Patents
Dispositif de formation d'une nappe de fibres en bourre, en particulier pour le chargement d'une machine textile telle qu'une carde Download PDFInfo
- Publication number
- EP0929704B1 EP0929704B1 EP98941521A EP98941521A EP0929704B1 EP 0929704 B1 EP0929704 B1 EP 0929704B1 EP 98941521 A EP98941521 A EP 98941521A EP 98941521 A EP98941521 A EP 98941521A EP 0929704 B1 EP0929704 B1 EP 0929704B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- air
- exhaust opening
- expansion chamber
- section
- chimney
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
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Classifications
-
- D—TEXTILES; PAPER
- D01—NATURAL OR MAN-MADE THREADS OR FIBRES; SPINNING
- D01G—PRELIMINARY TREATMENT OF FIBRES, e.g. FOR SPINNING
- D01G23/00—Feeding fibres to machines; Conveying fibres between machines
- D01G23/02—Hoppers; Delivery shoots
Definitions
- the present invention relates to a device for forming a sheet fiber fluff, which is more particularly intended to be positioned upstream of a textile machine such as a carding machine, to ensure continuous loading of textile material. It concerns more particularly an improvement made to the resumption of the air flow of densification at the outlet of the feed chimney of such a device.
- Devices for forming a sheet of fluffy fibers include so usual a supply chimney which is open at its ends upper and lower, and which is provided in the lower part with one or several air exhaust openings. They also include means for feeding fibrous material into the chimney supply by its open upper end, means of recovery of the fibrous fluff material, of the food roll type, which are arranged at the outlet of the lower end of the chimney supply, and means of forced circulation of a flow air for densification of the fibrous material between the upper part of the supply chimney and the exhaust opening (s).
- a constant concern of manufacturers and users of aforementioned devices is to get out of the supply chimney a sheet whose thickness must be as regular as possible over all the width, also called leveling, of the supply chimney.
- the densification air flow leaving the chimney supply is taken up by suction in an air return pipe, either to then be recycled in a closed circuit and to be reinjected into the supply chimney, either to be discharged into the ambient air after possibly have been filtered.
- the forced takeover air inside the expansion chamber influences the air flow by outlet of the supply chimney, and thereby influences the level of fibrous material inside this chimney.
- the aim of the present invention is to improve these devices known for forming a fleece of fluff fiber, to reduce and if possible to eliminate preferential areas of material accumulation to the inside of the chimney, and by that to get a tablecloth having a better homogeneity over its entire width.
- the solution of the invention essentially consists in having sought to improve the resumption of the densification air flow by suction at the outlet of the supply chimney, in order to minimize the influence of this recovery by suction on the air flow circulating inside the supply chimney.
- the device for forming a sheet of fiber fluff of the invention is known in particular from German patent application DE-A-3239524, in that it comprises a supply chimney which is open at its upper ends and lower, an expansion chamber which communicates with the supply chimney by means of an air exhaust opening of given section of width ( I ) or of several air exhaust openings distributed over a given cross-section of width ( I ), means for taking up by suction of the air inside the expansion chamber, means making it possible to supply fibrous material with fluff to the supply chimney by its open upper end, means for taking up the fluffy fibrous material, of the food roll type, which are arranged at the outlet of the lower end of the supply chimney, means for forced circulation of a densification air flow between the upper part of the supply chimney and the exhaust opening (s).
- the means for taking up the air inside the expansion chamber by suction comprise an air distribution chamber, which is designed to be placed under vacuum, and which communicates with the expansion chamber via an air intake slot which extends substantially over the entire width ( I ) of the section of the exhaust opening (s) or via a plurality of 'air intake openings which are distributed substantially over the entire width ( I ) of the section of the exhaust opening (s).
- the Applicant has observed that the densification air flow undergoes always an acceleration immediately out of the chimney at least in its portion closest to the suction return ducts, which acceleration results in a disruption of parallelism and a local increase in velocities air flow inside the supply chimney, disturbing thus the homogeneity of the densification air flow inside the supply chimney.
- This disturbance of the densification air flow explains the preferential accumulation of fibers in certain areas of the supply chimney.
- the implementation work of a distribution chamber with air return slot or plurality of air intake openings advantageously makes it possible to obtain good distribution of the suction flow at the outlet of the expansion and across the entire width of the corresponding expansion chamber the width of the section of the air exhaust opening (s) connecting the supply chimney and the relaxation.
- the air intake at the outlet of the detent modifies very little the orientation of the air flow velocity vectors at the exhaust openings between the chimney supply and the relaxation chamber. This air intake does not modify therefore not significantly the distribution of densification air inside of the supply chimney and thereby the level of materials fibrous in this chimney.
- the volume of the expansion chamber is large enough and the slit or return air openings are sufficiently distant from the exhaust opening (s), kind of create inside the relaxation room, immediately by outlet of the exhaust opening (s), a buffer zone (A) which extends at least over the entire section of the opening (s) exhaust, and in which the air from the supply chimney undergoes expansion so that the air velocities in the area buffer decreasing from the exhaust opening (s).
- the device 1 of FIG. 1 makes it possible to form a ply of fluff fibers which is received at the outlet for example on an apron 2 (shown in dotted lines) allowing the continuous routing of the ply of fluff fibers formed up to a textile machine such as for example a carding machine (not shown).
- This device comprises two vertical chimneys substantially positioned in the extension of the other, an upper chimney 3 said reserve chimney and a lower chimney 4 said supply chimney.
- a food cylinder 6 and an opening cylinder 7 are rotatably mounted which, in the particular example illustrated, have opposite directions of rotation.
- the bulk fibrous material is introduced, for example pneumatically, into the upper part of the reserve chimney 3, is conveyed by gravity to the food cylinder 6 and is shredded by the opening cylinder 7 while being brought up to at the open upper end 4 a of the supply chimney 4.
- the lower end 4 b of the supply chimney 4 is also open.
- two food rollers 8 At the outlet of this open lower end 4b are rotatably mounted two food rollers 8 which ensure the recovery of the fibrous material in fluff at the bottom of the reserve chimney 4 in order to convey it at the outlet of the device 1.
- the dimension of the supply chimney 4 in a plane transverse to the plane of Figure 1 corresponds to the width of the chimney feeding, and is still commonly called leveling of the supply chimney.
- the length of the rollers 8 is substantially equal to this width, and the sheet of fibers in fluff delivered on the apron 2 at the output of the device 1 present a width substantially equal to the width of the supply chimney 4.
- the feed chimney 4 also comprises, upstream of the food rollers 8, an exhaust opening 9 at the level of which a grid 10 is mounted.
- the exhaust opening 9 is of substantially rectangular shape of width I and height H 1 .
- the grid 10 comprises a plurality of vertical bars 10 a which delimit two by two a plurality of exhaust openings distributed over the entire width I. In practice, this width I preferably corresponds substantially to the width of the supply chimney 4. In another variant, the grid 10 could be eliminated, or replaced by a perforated grid.
- At least one fan 11 which makes it possible to blow a densification air flow inside the supply chimney 4.
- this air flow is introduced into the feed chimney 4 by its upper end 4 a .
- the introduction of this densification air flow could be carried out at another point of the upper part of the supply chimney, situated above the level of the exhaust opening 9.
- a system of baffles 12 which makes it possible, by successive deflections, to break the flow of ventilated air and thereby obtain a homogeneous distribution of the densification air flow at the inlet and over the entire width of the supply chimney 4.
- the densification air flow inside the chimney feed 4 accelerates towards the food rollers 8 the fibrous material introduced into the feed stack 4, which fibrous material accumulates above the two rollers 8.
- the densification air flow is exhausted above the level of the fibrous material through the exhaust opening 9.
- the exhaust opening 9 communicates with a trigger 13 which is provided with an opening 14 for suction recovery air inside the expansion chamber 13.
- the return opening 14 is in the form of a slit of small width e and of length substantially identical to the width I , and oriented parallel to the exhaust grille 10, that is to say the width of the supply chimney 4.
- the slot 14 could be replaced by a plurality of small section air intake openings, distributed over the entire width l of the expansion chamber.
- This slot-shaped opening 14 communicates with a distribution box 18 via a rectilinear channel 19 of height h .
- the distribution box 18 and the straight channel 19 define an air distribution chamber 18 a .
- the interior volume of the distribution box 18 and the section of the air intake opening 14 in the form of a slot are chosen so that the pressure drop of the air flow sucked through the slot 14 is significant and greater to the pressure drop inside the distribution box 18, which allows a good distribution of the suction flow through the slot over the entire length of the slot 14.
- the internal volume of the distribution box 18 is sufficiently large so that the pressure drop across the slot 14 is at least ten times greater than the pressure drop across the distribution box 18
- the distribution box 18 communicates for its depression with a cylindrical nozzle 20 for example by means of two connectors 21.
- This nozzle 20 has an end face 20 a closed and an end face 20 b open through which the sucked air is exhausted.
- the suction through the slot 14, the distribution box 18 and the nozzle 20 is created by means of a fan 22 connected to the open face 20b of the nozzle 20.
- a fan 22 connected to the open face 20b of the nozzle 20.
- the air from the device 1 is directed to a filtration system 23 for example a bag filter system to be rid of dust or residual fibers conveyed by this air.
- the air is released into the ambient air.
- the air leaving the nozzle 20 could be recycled in a closed circuit to the interior of the device 1.
- the outlet 20b of the nozzle 20 is connected directly to the inlet of the fan 11.
- the expansion chamber 13 has a sufficient volume and the suction return opening 14 is sufficiently distant from the exhaust opening 9 so that an area is created inside the expansion chamber 13 buffer A, which extends over the entire width l and at least over the entire height H 1 of the exhaust opening 9, and in which the air leaving the supply chimney 4 undergoes expansion, the air velocities in buffer zone A decreasing until reaching a low residual value Vr.
- the buffer zone A can be broken down into two zones 15 and 16.
- the air flow coming from the supply chimney 4 is a substantially parallel flow, the velocity vectors of this air flow being oriented substantially parallel to each other over the entire width I and the entire height H 1 of the exhaust openings, and their modulus decreases the further one moves away from the opening of exhaust 9 towards the second zone 16.
- the air flow velocities reach low residual values Vr, so that it can be considered that the air inside the chamber of relaxation is approximately at rest in the second zone 16.
- the suction that is created through the return opening 14 is translated inside the expansion chamber 13 by a third zone 17 low pressure, which is separated from the first zone 15 by the zone 16, and which results in the creation of an accelerated air flow towards of the return slot 14.
- the expansion chamber 13 has a front face 13 a formed by the exhaust grille 10, a rear rear face 13 b of rectangular width I and height H 3 greater than the height H 1 of the front face 13 a , two vertical side walls 13 c , 13 d , an upper wall 13 e and a lower wall 13 f .
- the expansion chamber 13 essentially consists of a first part which has a constant section identical to the section of the exhaust opening 9, and which extends from the exhaust opening 9 over a length d 1 , and a second part which has on the one hand in a vertical plane a section greater than the section (I x H 1 ) of the first part and on the other hand a volume greater than the volume of the first part.
- This second part extends to the rear face 13 b situated at a distance d 3 from the exhaust opening 9. More particularly, in the second part of the expansion chamber 13, the lower wall 13 f forms a substantially V-shaped funnel, in the bottom of which is provided the suction return opening 14.
- the air return opening 14 is therefore not located in the extension of the first part with constant section of the chamber trigger 13, but is offset in a vertical plane relative to the exhaust opening 9. If one refers to FIG. 1, the return opening 14 is distant from the exhaust opening 9, a distance d 2 taken in a horizontal plane and a distance H 2 taken in a vertical plane.
- the width I was worth 2500mm.
- the air flow of the fan 11 in normal operation, that is to say once the supply chimney loaded with fibrous material was 2200m 3 / h.
- the average speed of the air flows through the exhaust grid 10 at a level of the fiber-free grid was about 6 to 7 m / s.
- the velocities of the air flows through the exhaust grille measured at a given height were substantially equal over the entire width I , the speed differences being at most 5%.
- the speed of the air flow drawn through the slit 14 was substantially equal over the entire length of the slit and was about 30 m / s.
- the overall volume of the expansion chamber 13 was approximately 0.5 m 3 .
- the distances d 1 , d 2 and d 3 were 170mm, 370mm and 605mm respectively.
- the heights H 1 , H 2 and H 3 were respectively worth 232mm, 200mm and 420mm.
- the width e of the slot 14 was approximately 8mm.
- the height h of channel 19 was around 48mm.
- the volume of the distribution box 18 was approximately 0.03m 3 .
- the air speeds at the outlet of the supply chimney 4 dropped to reach, in zone 16, residual speeds Vr less than or equal to 1.5 m / s. More specifically, inside the zone 16, the residual air velocities were not homogeneous but were greater in the upper part, that is to say in the zone part in line with the opening of the exhaust 9. Overall, the average air speed in the second zone 16 was estimated at 0.5 m / s.
Landscapes
- Engineering & Computer Science (AREA)
- Textile Engineering (AREA)
- Preliminary Treatment Of Fibers (AREA)
- Nonwoven Fabrics (AREA)
Description
- La figure 1 est une représentation schématique vue de côté d'un dispositif de formation d'une nappe de fibres en bourre mettant en oeuvre une chambre de détente conformément à l'invention,
- La figure 2 est une vue en perspective de la chambre de détente du dispositif de la figure 1,
- et la figure 3 illustre de manière schématique un exemple particulier de recyclage dans l'air ambiant de l'air de densification aspiré en sortie du dispositif de la figure 1.
Claims (5)
- Dispositif de formation d'une nappe de fibres en bourre, plus particulièrement destinée au chargement en continu d'une machine textile telle qu'une carde, et comportant une cheminée d'alimentation (4) qui est ouverte à ses extrémités supérieure (4a) et inférieure (4b), une chambre de détente (13) qui communique avec la cheminée d'alimentation (4) par l'intermédiaire d'une ouverture d'échappement d'air (9) de section donnée de largeur (I) ou de plusieurs ouvertures d'échappement d'air réparties sur une section donnée de largeur (I), des moyens de reprise par aspiration de l'air à l'intérieur de la chambre de détente, des moyens (3,6,7) permettant d'alimenter en matière fibreuse en bourre la cheminée d'alimentation (4) par son extrémité supérieure ouverte, des moyens de reprise de la matière fibreuse en bourre, du type rouleaux alimentaires (8), qui sont disposés en sortie de l'extrémité inférieure de la cheminée d'alimentation, des moyens (11) de mise en circulation forcée d'un flux d'air de densification entre la partie supérieure de la cheminée d'alimentation (4) et la ou les ouvertures d'échappement (9), caractérisé en ce que les moyens de reprise par aspiration de l'air à l'intérieur de la chambre de détente (13) comportent une chambre de répartition d'air (18a), qui est prévue pour être mise en dépression, et qui communique avec la chambre de détente (13) par l'intermédiaire d'une fente (14) de reprise d'air qui s'étend sensiblement sur toute la largeur (l) de la section de la ou des ouvertures d'échappement (9) ou par l'intermédiaire d'une pluralité d'ouvertures de reprise d'air qui sont réparties sensiblement sur toute la largeur (I) de la section de la ou des ouvertures d'échappement (9).
- Dispositif selon la revendication 1 caractérisé en ce que le volume de la chambre de détente (13) est suffisamment important et la fente(14) ou les ouvertures de reprise d'air sont suffisamment éloignées de la ou des ouvertures d'échappement (9), en sorte de créer à l'intérieur de la chambre de détente, immédiatement en sortie de la ou des ouvertures d'échappement, une zone tampon (A) qui s'étend au moins sur toute la section de la ou des ouvertures d'échappement (9), et dans laquelle l'air issu de la cheminée d'alimentation subit une détente de telle sorte que les vitesses d'air dans la zone tampon vont en décroissant depuis la ou les ouvertures d'échappement (9).
- Dispositif selon la revendication 2 caractérisé en ce que la chambre de détente (13) est conçue de telle sorte que dans la zone tampon les vitesses d'air atteignent des vitesses résiduelles inférieures ou égales à 1,5m/s.
- Dispositif selon l'une des revendications 1 à 3 caractérisé en ce que la chambre de détente (13) est constituée d'une première partie qui présente une section constante identique à la section de l'ouverture d'échappement (9), et qui s'étend depuis l'ouverture d'échappement (9) sur une longueur (d 1), et une seconde partie dans laquelle est prévue la fente ou les ouvertures de reprise d'air (14), et qui présente une section et un volume supérieurs respectivement à la section et au volume de la première partie.
- Dispositif selon la revendication 4 caractérisé en ce que la fente (14) ou les ouvertures de reprise d'air (14) sont décalées dans un plan vertical par rapport aux ouvertures d'échappement (9).
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR9710168A FR2766846B1 (fr) | 1997-08-04 | 1997-08-04 | Dispositif de formation d'un voile de fibres en bourre, en particulier pour le chargement d'une machine textile telle qu'une carde |
FR9710168 | 1997-08-04 | ||
PCT/FR1998/001721 WO1999007929A1 (fr) | 1997-08-04 | 1998-07-31 | Dispositif de formation d'une nappe de fibres en bourre, en particulier pour le chargement d'une machine textile telle qu'une carde |
Publications (2)
Publication Number | Publication Date |
---|---|
EP0929704A1 EP0929704A1 (fr) | 1999-07-21 |
EP0929704B1 true EP0929704B1 (fr) | 2001-10-04 |
Family
ID=9510154
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP98941521A Expired - Lifetime EP0929704B1 (fr) | 1997-08-04 | 1998-07-31 | Dispositif de formation d'une nappe de fibres en bourre, en particulier pour le chargement d'une machine textile telle qu'une carde |
Country Status (7)
Country | Link |
---|---|
US (1) | US6085389A (fr) |
EP (1) | EP0929704B1 (fr) |
JP (1) | JP2001502019A (fr) |
AT (1) | ATE206493T1 (fr) |
DE (1) | DE69801889T2 (fr) |
FR (1) | FR2766846B1 (fr) |
WO (1) | WO1999007929A1 (fr) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN105228798A (zh) * | 2013-02-26 | 2016-01-06 | 艾沛克斯品牌公司 | 具有模块化结构的主动进给工具 |
Families Citing this family (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE19811143B4 (de) * | 1998-03-14 | 2009-09-17 | TRüTZSCHLER GMBH & CO. KG | Vorrichtung zum Speisen und Wiegen (Wiegespeiser) von Textilfasern, insbesondere Baumwolle und Chemiefasern |
DE102004012236A1 (de) * | 2004-03-12 | 2005-09-22 | Trützschler GmbH & Co KG | Vorrichtung an einer Spinnereivorbereitungsmaschine, z.B. Flockenspeiser, mit einer Speiseeinrichtung |
DE102007039055B4 (de) | 2007-08-17 | 2019-11-07 | Temafa Maschinenfabrik Gmbh | Verfahren zum Öffnen und Dosieren von Fasermaterial |
Family Cites Families (10)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR1435978A (fr) * | 1965-03-02 | 1966-04-22 | Dispositif pour l'alimentation d'une carde ou autre machine textiles | |
US4476611A (en) * | 1980-11-17 | 1984-10-16 | Automatic Material Handling, Inc. | Fiber feeding apparatus with fiber leveling means |
US4387486A (en) * | 1981-04-17 | 1983-06-14 | Automatic Material Handling, Inc. | Control system for fiber processing apparatus |
US4404710A (en) * | 1981-05-29 | 1983-09-20 | Rando Machine Corporation | Apparatus for feeding fibers to carding machines and the like |
US4403374A (en) * | 1981-06-17 | 1983-09-13 | Rando Machine Corporation | Means for controlling density of non-woven fiber webs |
US4394790A (en) * | 1981-12-30 | 1983-07-26 | Automatic Material Handling, Inc. | Fiber feeding apparatus with controlled air flow |
EP0113819A3 (fr) * | 1982-12-21 | 1984-08-22 | Maschinenfabrik Rieter Ag | Procédé pour le traitement des flocons de fibres et dispositif pour la mise en oeuvre de ce procédé |
US4520530A (en) * | 1983-09-02 | 1985-06-04 | Akiva Pinto | Fiber feeding apparatus with a pivoted air exhaust wall portion |
DE3912565A1 (de) * | 1989-04-17 | 1990-10-18 | Hollingsworth Gmbh | Vorrichtung zum speisen von in flockenform befindlichem fasergut |
DE3916986A1 (de) * | 1989-05-24 | 1990-11-29 | Rieter Ag Maschf | Verteiler zur speisung einer mehrzahl von schaechten |
-
1997
- 1997-08-04 FR FR9710168A patent/FR2766846B1/fr not_active Expired - Fee Related
-
1998
- 1998-07-31 AT AT98941521T patent/ATE206493T1/de active
- 1998-07-31 JP JP11511749A patent/JP2001502019A/ja active Pending
- 1998-07-31 WO PCT/FR1998/001721 patent/WO1999007929A1/fr active IP Right Grant
- 1998-07-31 US US09/269,902 patent/US6085389A/en not_active Expired - Fee Related
- 1998-07-31 EP EP98941521A patent/EP0929704B1/fr not_active Expired - Lifetime
- 1998-07-31 DE DE69801889T patent/DE69801889T2/de not_active Expired - Lifetime
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN105228798A (zh) * | 2013-02-26 | 2016-01-06 | 艾沛克斯品牌公司 | 具有模块化结构的主动进给工具 |
US9707654B2 (en) | 2013-02-26 | 2017-07-18 | Apex Brands, Inc. | Positive feed tool with a modular architecture |
US9808896B2 (en) | 2013-02-26 | 2017-11-07 | Apex Brands, Inc. | Positive feed tool with a modular architecture |
Also Published As
Publication number | Publication date |
---|---|
ATE206493T1 (de) | 2001-10-15 |
DE69801889D1 (de) | 2001-11-08 |
FR2766846B1 (fr) | 1999-10-22 |
DE69801889T2 (de) | 2002-04-04 |
US6085389A (en) | 2000-07-11 |
WO1999007929A1 (fr) | 1999-02-18 |
JP2001502019A (ja) | 2001-02-13 |
EP0929704A1 (fr) | 1999-07-21 |
FR2766846A1 (fr) | 1999-02-05 |
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