EP3978661B1 - Manchon perforé - Google Patents

Manchon perforé Download PDF

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Publication number
EP3978661B1
EP3978661B1 EP21199023.9A EP21199023A EP3978661B1 EP 3978661 B1 EP3978661 B1 EP 3978661B1 EP 21199023 A EP21199023 A EP 21199023A EP 3978661 B1 EP3978661 B1 EP 3978661B1
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EP
European Patent Office
Prior art keywords
filaments
sieve
transverse
longitudinal
apron
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.)
Active
Application number
EP21199023.9A
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German (de)
English (en)
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EP3978661A1 (fr
Inventor
Peter Blankenhorn
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
RIETER AG
Original Assignee
Maschinenfabrik Rieter AG
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Publication of EP3978661A1 publication Critical patent/EP3978661A1/fr
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Publication of EP3978661B1 publication Critical patent/EP3978661B1/fr
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    • D—TEXTILES; PAPER
    • D01—NATURAL OR MAN-MADE THREADS OR FIBRES; SPINNING
    • D01H—SPINNING OR TWISTING
    • D01H5/00—Drafting machines or arrangements ; Threading of roving into drafting machine
    • D01H5/18—Drafting machines or arrangements without fallers or like pinned bars
    • D01H5/70—Constructional features of drafting elements
    • D01H5/86—Aprons; Apron supports; Apron tensioning arrangements
    • D—TEXTILES; PAPER
    • D03—WEAVING
    • D03D—WOVEN FABRICS; METHODS OF WEAVING; LOOMS
    • D03D1/00—Woven fabrics designed to make specified articles
    • D03D1/0094—Belts
    • D—TEXTILES; PAPER
    • D03—WEAVING
    • D03D—WOVEN FABRICS; METHODS OF WEAVING; LOOMS
    • D03D15/00—Woven fabrics characterised by the material, structure or properties of the fibres, filaments, yarns, threads or other warp or weft elements used
    • D03D15/40—Woven fabrics characterised by the material, structure or properties of the fibres, filaments, yarns, threads or other warp or weft elements used characterised by the structure of the yarns or threads
    • D03D15/43—Woven fabrics characterised by the material, structure or properties of the fibres, filaments, yarns, threads or other warp or weft elements used characterised by the structure of the yarns or threads with differing diameters

Definitions

  • the present invention relates to an endless screen belt for transporting a fiber structure to be compressed over a suction slot of a compression device of a spinning machine, which has a plurality of adjacent longitudinal filaments in the circumferential direction and a plurality of adjacent transverse filaments transversely to the circumferential direction, wherein there are gaps between adjacent longitudinal filaments and adjacent transverse filaments, which form free surfaces so that the screen belt is permeable to air.
  • a fiber structure stretched in a drafting system leaves the drafting system with a certain width and is then twisted into a thread with a relatively small diameter.
  • the thread contains edge fibers that are not properly integrated into the twisted thread and thus contribute little to the strength of the thread.
  • a compression zone is arranged downstream of the drafting zone of the drafting system. In the compression zone, the fibers are compressed together, making the fiber structure narrower. The resulting thread is then more uniform, stronger and less hairy.
  • One of the ways to compress the fiber structure is a suction pipe that is wrapped around an endless, air-permeable sieve belt.
  • the sieve belt slides over a suction slot in the suction pipe that is arranged at an angle to the running direction of the fiber structure.
  • the running direction of the fiber structure essentially corresponds to the circumferential direction of the sieve belt.
  • the fiber structure is transported on the sieve belt and compressed along a suction edge of the suction slot.
  • An air-permeable conveyor belt of this type is known for transporting a fiber structure to be compressed over a suction slot in a compression zone of a spinning machine.
  • the conveyor belt is designed as a fabric belt and consists of longitudinal threads running in the direction of transport of the fiber structure and transverse threads running perpendicular to the direction of transport of the fiber structure.
  • the clear distance between two longitudinal threads is greater than the clear distance between two transverse threads.
  • the aim is to create a conveyor belt which, on the one hand, ensures a sufficiently large air flow and, on the other hand, prevents the suction of lost fibers as far as possible.
  • a top apron of a drafting system of a spinning machine is known.
  • This top apron has an inner ring layer and an outer ring layer that are inseparably connected to one another.
  • the surface of the outer ring layer has an uneven texture, and the shape of the uneven texture is grainy and/or wavy.
  • the properties of such a top apron of a drafting system that must be fulfilled are the opposite of the properties of a screen apron. While the fibers must be held in the top apron of the drafting system, they must be moved transversely to their longitudinal axis in a screen apron. In addition, the top aprons of a drafting system are not permeable to air.
  • the JP 2009185436 A describes a double apron drafting system with upper aprons and/or lower aprons as guide aprons, which are made of a fabric whose warp threads and weft threads each have a thickness of no more than 0.2 mm and whose outside is covered with a layer of rubber-elastic material that has a thickness of no more than 0.3 mm. These aprons are also not permeable to air and must guide the fibers so that the fibers do not change their position. In contrast, with a sieve apron, the fibers are moved transversely to their longitudinal direction and the sieve apron is vacuumed in order to give the fibers a hold on the sieve apron.
  • the object of the present invention is therefore to create a sieve belt which is wear-resistant and yet allows the fiber structure on the sieve belt to be moved very well transversely to the circumferential direction of the sieve belt.
  • a sieve belt has an endless circumference for transporting a fiber structure to be compressed over a suction slot of a compression device of a spinning machine.
  • a large number of adjacent longitudinal filaments are arranged in the circumferential direction of the sieve belt and a large number of adjacent transverse filaments are arranged transversely to the circumferential direction of the sieve belt.
  • the longitudinal filaments have a thinner cross-section than the transverse filaments.
  • the use of finer longitudinal filaments, which will generally be the weft filaments, and stronger transverse filaments, which will generally be the warp filaments, leads to significant advantages.
  • the stronger transverse filament With the stronger transverse filament, the screen apron has a larger wear volume.
  • the stronger transverse filament which lies transversely to the circumferential direction of the screen apron or transversely to the transport direction of the fiber structure, rests on the suction pipe, while the longitudinal filament is so tensioned that it is not pressed onto the suction pipe even under the load of a pressure roller. Wear therefore occurs first on the thicker transverse filament. This increases possible wear times and the service life of the screen apron is extended accordingly.
  • the finer longitudinal filament also maintains the necessary low bending stiffness of the screen apron.
  • the screen apron continues to run around the small radii of the suction pipe without a gap.
  • Another advantage is that the fibers lie mainly on the back of the stronger and more closely spaced transverse filaments. This makes it easier for the fibers of the fiber structure to be moved across the spinning direction and thus more intensively compressed. If anything, the fibers are less hindered in their transverse movement by the longitudinal filaments because of their greater distance.
  • a particular advantage of the invention is that the thinner longitudinal filament touches the suction pipe, if at all, with reduced contact force and only after the cross filaments have become worn after a certain period of operation.
  • a screen belt consisting of both reinforced cross and reinforced longitudinal filaments could be advantageous in terms of wear, but it would have problems with the transverse displacement of the fibers and with the flexibility of the sieve belt in the circumferential direction and thus the gap-free nature between the suction pipe and the sieve belt, disadvantages which are avoided with the sieve belt according to the invention.
  • a particularly advantageous design of the screen apron is when the longitudinal filaments are arranged within areas formed by turning points of the transverse filaments.
  • a type of covering surface on the screen apron is thus spanned by the transverse filaments.
  • the thinner longitudinal filaments mean that the fabric can be manufactured in such a way that the longitudinal filaments, at least when new, are always at most at the level of the transverse filaments, but preferably below the transverse filaments.
  • the longitudinal filaments are therefore not exposed to the transverse filaments. They are preferably below the transverse filaments, but at most in the same covering surface as the transverse filaments. They are thus largely protected from wear by the thicker transverse filaments.
  • the screen apron therefore remains usable for longer and retains the property of good transverse mobility of the fibers on the screen apron for a long time.
  • the longitudinal filaments meander less than the transverse filaments.
  • incorporation or crimping is the ratio of the length of a filament incorporated into the fabric to its length when stretched. The smaller the incorporation, the more stretched the filaments are in the fabric. In this case, this means that the particularly advantageous screen apron has a smaller incorporation of the longitudinal filaments than the transverse filaments. The distance between the turning points of the longitudinal filaments is therefore smaller than the distance between the turning points of the transverse filaments.
  • the longitudinal filament is the weft filament, the screen apron is woven with a low weft incorporation.
  • the longitudinal filament or weft filament meanders only very slightly or, if it runs essentially straight, hardly at all through the transverse filaments or the warp filaments. Minimal meandering is advantageous in order to obtain better slip resistance of the fabric.
  • the longitudinal filaments run essentially in a straight line.
  • the longitudinal filaments are therefore not or hardly incorporated into the fabric.
  • the stability of the transverse filaments relative to one another is reduced, the wear resistance and the ability of the fibers to be moved very easily transversely on the screen belt is improved. The reason for this is that the time until the transverse filaments are worn to the point where they are the same height as the thinner longitudinal filaments, or until the screen belt tears, is extended.
  • the distance between adjacent longitudinal filaments is greater than the distance between adjacent transverse filaments.
  • the close distance between the transverse filaments is compensated for in terms of the mesh size by the larger distance between the longitudinal filaments.
  • the free screen surface does not become too large due to the closer arrangement of the transverse filaments. If the screen surface is too large, the fibers would be sucked through more. It is therefore advantageous to create a screen surface which, on the one hand, ensures that the fibers adhere sufficiently to the screen belt, but on the other hand still allows the fibers to be moved sideways and, if possible, no fibers are sucked through the screen belt.
  • the free area between the longitudinal filaments and the transverse filaments i.e. the screen area
  • the free area between the longitudinal filaments and the transverse filaments is between 20% and 60%, preferably between 30% and 50% of the screen apron area.
  • the suitable size of the screen area depends in particular on the type and size of the fibers of the fiber structure to be compacted.
  • the cross filaments have a diameter that is between 10% and 80% larger than the diameter of the longitudinal filaments.
  • the suitable diameter of the filaments depends, among other things, on the type and size of the fibers of the fiber structure to be compacted.
  • the service life i.e. the duration of the wear resistance of the screen belt, and the ability of the fibers to be moved can be influenced by this.
  • the screen belt has a plain weave or a twill weave. This makes the screen belt easy to manufacture.
  • a plain weave the dimensional stability of the fabric is very good on the one hand and the adaptation to the suction pipe without a gap is very good on the other. This creates very good resistance to displacement and running stability.
  • the twill weave running directions of the screen belt or different sides of the screen belt can be produced.
  • the screen belt is antistatic. This can be done by coating the screen belt with an antistatic coating, for example with carbon. However, all or some of the filaments can also be made of antistatic material and woven into the screen belt.
  • Figure 1 shows a schematic representation of a side view of a section of a drafting system 1 of a spinning machine, in particular a ring spinning machine with a compression device 2.
  • the drafting system 1 comprises a pair of feed rollers 3, a pair of draft rollers 4 and a pair of output rollers 5.
  • Each of the roller pairs 3, 4 and 5 is formed by an upper roller and a lower roller or a lower cylinder.
  • each roller pair 3, 4 and 5 are pressed against each other and form a clamping point K1, K2 and K3 at their point of contact for a fiber bundle 6 running into the drafting system 1, whereby the clamping point K1 is formed by the feed roller pair 3, the clamping point K2 by the drafting roller pair 4 and the clamping point K3 by the output roller pair 5.
  • a thread clamping point K4 is formed by a pressure roller 7 which presses against a suction pipe 8 which can be suctioned. Due to the different speeds of the roller pairs 3, 4 and 5, the fiber bundle 6 is stretched. During the stretching, the fiber bundle 6 is simultaneously transported through the drafting system 1. After leaving the drafting system 1, the stretched fiber band 1 reaches the compression device 2 in which it is compressed.
  • the compression device 2 has a suction slot 9 between the clamping point K3 and the thread clamping point K4 on the suction pipe 8, on the edge of which the fibers of the fiber structure 6 are bundled or compressed.
  • the stretched fiber structure 6 is transported in the transport direction T via the suction pipe 8 by means of a screen belt 10, which wraps around the suction pipe 8 and a deflection rod 11 in the circumferential direction U.
  • the screen belt 10 is driven by the pressure roller 7.
  • the pressure roller 7 is in turn set in rotation by means of elements not shown via the upper roller of the output roller pair 5. Negative pressure, which is present in the suction pipe 8 and sucks in the fiber structure 6 via the suction slot 9, also acts through the screen belt 10, which is permeable to air.
  • the fiber structure 6, which forms a thread 12 after the clamping point K4 reaches a thread guide 13 and is guided further to a spinning device (not shown).
  • the upper rollers can be lifted from the lower rollers of the roller pairs 3, 4 and 5 as well as the pressure roller 7.
  • a loading arm 14 to which the upper rollers and the pressure roller 7 are attached in a known manner, is moved about a pivot point D in the direction of arrow P.
  • Figure 2 shows a top view of the compaction device 2 with the sieve belt 10.
  • the fiber structure 6 is transported together with the rotating sieve belt 10 in the circumferential direction U of the sieve belt or in the transport direction T of the fiber structure 6 via the suction pipe 8.
  • the sieve belt 10 rests on the suction pipe 8 and slides over it.
  • the sieve belt 10 is driven, as can be seen from Figure 1 visible, by the pressure roller 7, which is itself driven.
  • the fiber structure 6 is sucked in the area of the suction slot 9 and compressed at an edge of the suction slot 9, which is inclined in relation to the transport direction T of the fiber structure 6.
  • the screen belt 10 is permeable to air, so that the negative pressure in the suction pipe 8 can act on the fibers of the fiber structure 6 through the screen belt 10.
  • the sliding contact of the screen belt 10 on the suction pipe 8 causes wear on the underside of the screen belt 10.
  • Figure 3 shows an enlarged detail of a fabric of a screen apron 10 according to the invention in plain weave.
  • the fabric of the screen apron 10 has adjacent longitudinal filaments 15 and adjacent transverse filaments 16.
  • Fibers 17 of the fiber structure 6 are shown schematically lying on the screen apron 10.
  • the fiber structure 6 accordingly lies on the screen apron 10 in the transport direction T of the fiber structure 6.
  • the fibers 17 are aligned lengthwise in the circumferential direction U of the screen apron 10.
  • Longitudinal filaments 15 and transverse filaments 16 are spaced apart from one another so that the sieve belt 10 is permeable to air by means of the resulting meshes.
  • a distance AL between the longitudinal filaments 15 is greater than a distance AQ between the transverse filaments 16.
  • the distance AL can be, for example, about 400 ⁇ m and the distance AQ, for example, 100 ⁇ m.
  • a sieve surface 18 created in this way has rectangular meshes with the dimensions of the distances AL and AQ between the longitudinal filaments 15 and the transverse filaments 16.
  • the small mesh size in the circumferential direction U or transport direction T results in a low fiber loss.
  • the large mesh size transverse to the fiber direction enables a large volume flow of the suction air and a good compaction effect of the fiber structure 6.
  • the free area between the longitudinal filaments 15 and the transverse filaments 16, the screen area 18, is in particular between 20% and 60%, preferably between 30% and 50% of the total screen apron area.
  • the longitudinal filaments 15 have a diameter DL which is significantly smaller than a diameter DQ of the transverse filaments 16.
  • the transverse filaments 16 preferably have a diameter DQ which is between 10% and 80% larger than the diameter DL of the longitudinal filaments 15.
  • the transverse filaments 16 can have a diameter DQ of approximately 150 ⁇ m and the longitudinal filaments 15 can have a diameter DL of approximately 100 ⁇ m. This difference in diameter means that the sieve belt 10 rests on the suction pipe 8 essentially on the surfaces of the transverse filaments 16. The wear will therefore affect the transverse filaments 16 first. Only when these have been worn down to a height that is the same as the longitudinal filaments 15 will the longitudinal filaments 15 also be included in the wear.
  • Figure 4a shows a section through a fabric of a screen belt 10 in the transport direction T of the fiber structure 6 or in the circumferential direction U of the Sieve belt 10.
  • the fibers 17 of the fiber structure 6 would accordingly lie along the plane of the drawing on the sieve belt 10.
  • the diameter DL of the longitudinal filaments 15 is smaller than the diameter DQ of the transverse filaments 16.
  • imaginary surfaces F, which rest on turning points WQ of the transverse filaments 16 are spaced from turning points WL of the longitudinal filaments 15.
  • the underside of the sieve belt 10 essentially lies on the suction pipe 8 with the turning points WQ of the transverse filaments 16.
  • the pressure roller 7 On the top side of the sieve belt 10, the pressure roller 7 also essentially accesses the turning points WQ of the transverse filaments 16.
  • the wear will therefore mainly occur on the transverse filaments 16, since the thinner longitudinal filaments 15, which also meander less, are spaced a distance a from these surfaces F and thus generally have no contact with the suction pipe 8 and the pressure roller 7.
  • the distance AWL of the turning points WL from each other is therefore smaller than the distance AWQ of the turning points WQ from each other.
  • the turning points WL are located between the two surfaces F.
  • FIG 4b is a section through a fabric of a screen belt 10 transverse to the transport direction T of the fiber structure 6 or transverse to the circumferential direction U of the screen belt 10.
  • the fibers 17 of the fiber structure 6 would thus lie perpendicular to the plane of the drawing on the screen belt 10.
  • the imaginary surface F resting on the turning points WQ is spaced a distance a from the turning points WL of the longitudinal filaments 15. This creates points of attack for the sliding of the screen belt 10 over the suction pipe 8 and for the drive by the pressure roller 7 essentially on the thicker transverse filaments 16.
  • the thinner longitudinal filaments 15 are located on each side of the screen belt 10 at a distance a from the respective surface F.
  • the thinner longitudinal filaments 15 are thus separated by the thicker Transverse filaments 16 are protected because they are not exposed to the transverse filaments 16 in the fabric of the sieve belt 10.
  • the present invention is not limited to the embodiments shown and described.
  • thickness and spacing ratios of the longitudinal filaments 15 and transverse filaments 16 other than those shown are possible.
  • the incorporation of the longitudinal filaments 15 can also be more or less than shown in the embodiments.
  • the spacing a it is also possible within the scope of the invention for the spacing a to be reduced to the value "0". This can be achieved by incorporating the longitudinal filaments 15 more deeply.

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  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Spinning Or Twisting Of Yarns (AREA)

Claims (10)

  1. Lanière de tamisage pour transporter un ensemble de fibres (6) à compacter au-dessus d'une fente d'aspiration (9) d'un dispositif de compactage (2) d'une machine à filage, avec une circonférence sans fin, qui comporte dans la direction circonférentielle (U) une pluralité de filaments longitudinaux (15) adjacents et transversalement à la direction circonférentielle (U) une pluralité de filaments transversaux (16) adjacents et entre des filaments longitudinaux (15) adjacents et des filaments transversaux (16) adjacents sont présents des espacements (AL, AO) qui forment des surfaces libres pour que la lanière de tamisage (10) soit perméable à l'air, caractérisé en ce que les filaments longitudinaux (15) adjacents comportent une section transversale plus mince que les filaments transversaux (16) adjacents.
  2. Lanière de tamisage selon la revendication précédente, caractérisé en ce que les filaments longitudinaux (15) sont disposés à l'intérieur de surfaces (F) formées par des points de renvoi (WO) des filaments transversaux (16).
  3. Lanière de tamisage selon l'une ou plusieurs des revendications précédentes, caractérisé en ce que les filaments longitudinaux (15) sont moins sinueux que les filaments transversaux (16), de sorte qu'un écartement (AWL) des points de renvoi (WL) des filaments longitudinaux (15) est inférieur à un écartement (AWO) des points de renvoi (WO) des filaments transversaux (16).
  4. Lanière de tamisage selon l'une ou plusieurs des revendications précédentes, caractérisé en ce que les filaments longitudinaux (15) s'étendent essentiellement en ligne droite.
  5. Lanière de tamisage selon l'une ou plusieurs des revendications précédentes, caractérisé en ce que l'écartement (AL) de filaments longitudinaux (15) adjacents est supérieur à l'écartement (AQ) de filaments transversaux (16) adjacents.
  6. Lanière de tamisage selon l'une ou plusieurs des revendications précédentes, caractérisé en ce que la surface libre entre les filaments longitudinaux (15) et les filaments transversaux (16) est comprise entre 20 % et 60 %, de préférence entre 30 % et 50 % de la surface de la lanière de tamisage.
  7. Lanière de tamisage selon l'une ou plusieurs des revendications précédentes, caractérisé en ce que les filaments transversaux (16) comportent un diamètre (DQ) qui est entre 10 % et 80 % supérieur au diamètre (DL) des filaments longitudinaux (15).
  8. Lanière de tamisage selon l'une ou plusieurs des revendications précédentes, caractérisé en ce que la lanière de tamisage (10) comporte une armure toile ou une armure sergée.
  9. Lanière de tamisage selon l'une ou plusieurs des revendications précédentes, caractérisé en ce que la lanière de tamisage (10) est antistatique.
  10. Lanière de tamisage selon l'une ou plusieurs des revendications précédentes, caractérisé en ce que des surfaces imaginaires (F) qui reposent sur les points de renvoi (WQ) des filaments transversaux (16) sont espacées des points de renvoi (WL) des filaments longitudinaux (15), de sorte que les filaments longitudinaux (15) plus minces sont disposés à un écartement (8) de ces surfaces (F).
EP21199023.9A 2020-09-30 2021-09-27 Manchon perforé Active EP3978661B1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE102020125521.7A DE102020125521A1 (de) 2020-09-30 2020-09-30 Siebriemchen

Publications (2)

Publication Number Publication Date
EP3978661A1 EP3978661A1 (fr) 2022-04-06
EP3978661B1 true EP3978661B1 (fr) 2024-04-10

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EP21199023.9A Active EP3978661B1 (fr) 2020-09-30 2021-09-27 Manchon perforé

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EP (1) EP3978661B1 (fr)
CN (1) CN114318597A (fr)
DE (1) DE102020125521A1 (fr)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102021132482A1 (de) * 2021-12-09 2023-06-15 Rieter Components Germany Gmbh Verdichtungseinrichtung einer Spinnmaschine sowie Transportriemchen und Zwischenriemchen

Family Cites Families (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH05305754A (ja) 1992-04-30 1993-11-19 Fujicopian Co Ltd インクリボン
DE19837182B4 (de) 1998-08-17 2007-01-25 Stahlecker, Fritz Transportband zum Transportieren eines zu verdichtenden Faserverbandes
DE10018002A1 (de) 2000-04-11 2001-10-25 Stahlecker Fritz Transportband zum Transportieren eines zu verdichtenden Faserverbandes
DE10104182B4 (de) 2001-01-24 2012-03-29 Maschinenfabrik Rieter Ag Transportband zum Transportieren eines zu verdichtenden Faserverbandes
CN1187241C (zh) 2003-04-28 2005-02-02 宁波德昌精密纺织机械有限公司 一种紧密纺纱器的透气环形输送带
CN1556267A (zh) 2003-12-31 2004-12-22 无锡莱福纶生物材料有限公司 一种紧密型纺纱用网格状吸聚圈及其织造方法
JP4524233B2 (ja) 2005-09-22 2010-08-11 イチカワ株式会社 シュープレス用ベルト
DE202007013020U1 (de) 2007-09-17 2007-11-22 Sefar Ag Siebriemchen für ein Streckwerk einer Spinnmaschine sowie Streckvorrichtung mit einem Siebriemchen
DE102008009230A1 (de) * 2008-02-04 2009-08-06 Wilhelm Stahlecker Gmbh Führungsriemchen für Doppelriemchenstreckwerke und Doppelriemchenstreckwerk
CN102605487A (zh) 2011-09-07 2012-07-25 常熟市迅达粉末冶金有限公司 一种抗静电紧密纺用网格圈
DE102014106745A1 (de) 2014-05-13 2015-11-19 Maschinenfabrik Rieter Ag Siebriemchen
CN204281941U (zh) 2014-12-01 2015-04-22 安徽省潜山县八一纺织器材厂 适用于环锭细纱机紧密纺装置的节能网格圈
CN111254529A (zh) * 2019-10-01 2020-06-09 李岚 一种细纱机牵伸机构上皮圈

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EP3978661A1 (fr) 2022-04-06
DE102020125521A1 (de) 2022-03-31
CN114318597A (zh) 2022-04-12

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