DE202007019280U1 - Rotordüsekonverter - Google Patents

Abstract

Rotary nozzle converter (10) for converting one or more continuous yarns (12) into staple fibers by means of a rotor nozzle (14, 16) and a cutter (18), the nozzle function being integrated into the rotor (14) and the yarn at an angle is deflected by less than 90 °.

Description

State of the art

The invention relates to a rotary nozzle converter for converting one or more endless yarns into staple fibers.

For new developments in the field of medical textiles and technical textiles, in the field of materials on the one hand and in the product sector on the other hand, staple fibers made of continuous filaments are needed. The high price of the raw materials and the material properties mean that known processes can not be used due to the mass throughput or the required brittleness of the fiber material. Most of the fibers are cut by hand. Both the demands on the length of the pile, the costs as well as the purity are not met.

The invention is therefore in particular the object of providing a converter with which fibers or yarns can be optimally cut.

The object is achieved by a Rotordüsekonverter according to claim 1 and a converter according to claim 22, wherein further embodiments of the inventions claims 2 to 21 or 23 and 26 can be removed.

The invention relates to a rotary nozzle converter for converting one or more endless yarns into staple fibers by means of a rotor nozzle and a cutter, wherein the nozzle function is integrated into the rotor and the yarn is deflected by an angle of less than 90 °. Under a cutting should be understood here preferably a blade with at least one cutting edge. The rotor nozzle sucks the fiber strand itself and conveys it by means of a supplied gas stream, preferably by means of air, at the same speed at which the endless yarn is fed to a nozzle exit of the rotor. By the negative pressure in the catchment area and the transport by means of an air flow to the cutting the thread is advantageously aligned straight over the entire transport path. Further, the self-priming of the nozzle allows integration of the rotor nozzle converter in a running process for further processing of the staple fibers and reduces the air consumption of the converter with respect to a separate arrangement of nozzle and rotor. A so-called in-line circuit is important to ensure the purity of the material and to avoid yarn damage by winding operations, recrystallization, storage and transport. At the same time, the process becomes more productive by combining individual stages. Thereby a higher process speed and the saving of costs are possible. By deflecting the yarn at an angle of less than 90 °, all fiber types can be processed. The deflection of the yarn causes the yarn to exit at an outer edge of the rotor nozzle, thereby moving and cutting the yarn at an increased speed.

Advantageously, a second cutting edge is provided. Preferably, this acts as a counter-blade to the first cutting edge. The design allows separation of fibers of soft and tough nature, since the two cutting edges develop sufficient force to cut tough fibers as well, with the second cutting edge applying a counter pressure to the pressure developed by the first cutting edge.

It is proposed that the second cutting edge is rotatably mounted. Due to the rotation of the second cutting edge, the two cutting edges are not in constant contact. As a result, the generation of heat is avoided because the two edges only touch once per revolution of the rotor.

It is also proposed that the second cutting edge is fixed to the rotor. This allows a simple construction of the converter, as can be dispensed with a separate storage of the second cutting edge. The second cutting edge may be an attachment plate, which is applied to a surface of the Rotordüsekonverters, preferably an end face of the Rotordüsekonverters in which at least one outlet opening of the yarn is applied to the entire extent and at least one recess which releases the outlet opening and the is cut like a blade at its edges.

It is proposed that the second cutting edge cover a front side of the rotor nozzle in a segment-like manner. Here, the side of the rotor nozzle is defined as the end face on which the outlet opening of the endless yarn is arranged. Segment-like in this context means that the second cutting only covers a portion of the end face of the Rotordüsekonverters and remain free large parts of the total area. Advantageously, the second cutting edge is formed as a sheet metal part which is beveled like a blade on the side facing the outlet opening of the yarn. In addition, this sheet metal part is easy and inexpensive to produce or replace.

Furthermore, it is advantageous if a cutting edge of the second cutting edge forms a secant to an exit opening of the yarn. Advantageously, the cutting edge of the second cutting edge is at one Side of the exit opening of the yarn arranged, which is in an execution of a section, viewed in a projection view, opposite to the side on which the first cutting edge is arranged. This ensures a consistent and good quality of cut.

Furthermore, it may be advantageous if at least one cutting edge of the first cutting edge and at least one cutting edge of the second cutting edge lie in a common plane in at least one operating mode, whereby the cut of the yarn can be carried out correctly and with μm accuracy.

A high power development for cutting the yarn can be achieved if, in at least one operating mode, the first cutting edge and the second cutting edge are biased against each other. The operating mode preferably represents a cutting operation.

It may be particularly advantageous if at least one cutting edge of the first cutting edge and at least one cutting edge of the second cutting edge have a tilt relative to one another, which is intended to set a force component between the cutting edges during a cutting operation by means of the cutting edges. As a result, it is possible in particular to build up a voltage between the cutting edges and / or to achieve a change in a force component or a voltage during a cutting process. By tilting an optimal and at the same time gentle cutting result can be achieved. It is achieved a stepless change in force in a movement along the cutting edges in the cutting process, through which the fiber is handled without damage during a threading process. Furthermore, vibrations of the cutting edges, caused by a meeting of the cutting edges in the cutting process, can be reduced. Alternatively or additionally, an insertion bevel may be provided, which is arranged in at least one region of a cutting edge and lies on one side, which faces the other cutting edge. As a result, a particularly soft transition can be achieved at the beginning of the overlapping of the cutting edges.

In a further embodiment of the invention, it is proposed that at least one cutting edge has a formation which is provided to set a force component between the cutting edges during a cutting operation by means of the cutting edges. This formation should in particular be a curvature formed in the longitudinal direction of the cutting edge, which effects the same effect and the same advantages as the tilting.

It is also proposed that the first cutting edge and the second cutting edge are intended to perform a cutting of the yarn according to a scissor-type principle. By "scissors principle" is to be understood here that the two cutting edges touch directly in front of the cut in a cutting point, which moves in a process of cutting and thus in a sliding past the cutting edges along the longitudinal extension of the cutting edges. This allows a precise and straight cut of the fibers. Thus, tough fibers can be cut. Preferably, the two cutting work on the principle of a cutting shear, whereby a large power development can be ensured for cutting the yarn.

Advantageously, an adjusting device for adjusting at least one cutting edge is provided. As a result, both blades can be matched exactly. In order to be able to cut the fibers precisely, the cutting edges must be aligned exactly 1 μm. Particularly advantageously, the adjustment device has a partial region provided for elastic deformation, whereby a fine adjustment of a cutting arrangement can be achieved in a structurally simple manner.

It is proposed that a collecting device for the staple fibers is provided, wherein the collecting device has a box and a shaft opening into the box. The box can also be replaced by another, useful to those skilled in collecting device, such as a shaft. This embodiment makes it possible for the cut or severed fibers to pass directly into the resulting fleece or fiber bed without impurities.

It is also proposed that the shaft surround the cutting edges. Hereby, flying away of the cut fibers is effectively prevented, whereby the shaft acts as a nozzle.

Furthermore, it is proposed that the collecting device has an extraction device in order to accelerate the formation of a nonwoven or fiber bed and to optimize it overall.

In addition, it is proposed that the collecting device has a separating device which separates the blown and cut fibers from the air.

A preferred development is that a device is provided which has a plurality of rotor nozzle converter. As a result, a high throughput rate of cut staple fibers can advantageously be achieved.

An inexpensive device can be advantageously achieved if a drive is provided which at least partially drives the rotor nozzle converter.

Furthermore, it is advantageous if the drive is a belt drive with a belt, which has a double-sided toothing. As a result, a synchronously operating device can be structurally simple and cost-effective. The belt can be designed as a wedge, flat or round belt, as a chain and / or particularly advantageous as a toothed belt. But it is also another conceivable to those skilled in the art as Umschlingungsantrieb conceivable.

In a further embodiment of the invention, a converter is provided for converting one or more endless yarns into staple fibers having a yarn outlet and a cutting edge, wherein the yarn outlet is stationary and the cutting edge is rotatably mounted. This results in an arrangement that is structurally easy to drive, since only one component of the converter must be moved.

In addition, it is proposed that the converter has a second cutting edge, whereby a cut of the fiber is particularly efficient, since the second cutting edge applies a counterpressure to the pressure developed by the first sheath.

It is also proposed that the second cutting edge is fixedly mounted and acts as a counter-cutting edge to the first cutting edge. As a result, a constant contact of the cutting and thus the formation of heat can be avoided.

drawings

Further advantages emerge from the following description of the drawing. In the drawings, an embodiment of the invention is shown. The drawings, the description and the claims contain numerous features in combination. The person skilled in the art will expediently also consider the features individually and combine them into meaningful further combinations.

Show it:

1 a rotor nozzle converter in a front view with a fixed cutting edge and a rotating counter cutting edge,

2 a Rotordüsekonverter according to 1 as a sectional view AA,

3 a rotor nozzle converter in a longitudinal section,

4 an adjusting device for the cutting edges,

5 a collecting device for the staple fibers in a schematic representation with a box and opening into the box shaft,

6 a device with several rotor nozzle converters,

7 a converter with a plurality of fixed fiber outlets and a rotatably mounted cutting edge and

8th a schematic representation of a tilt and a shape of the cutting.

Description of the embodiments

The 1 to 3 show a rotor nozzle converter 10 to convert a yarn 12 in staple fibers. It can be mixed both several yarn or fiber strands and different yarn or fiber types. The rotor nozzle converter 10 includes a rotor nozzle 14 . 16 which is a rotor 14 having. The rotor 14 is in at least one storage 50 rotatably mounted and via a drive 52 set in rotation. In the present embodiment, it is preferably a belt drive, wherein in the 2 and 3 only the belt guide 52 is shown. However, it can also be any further drive that appears appropriate to a person skilled in the art.

The rotor 14 has a channel 54 for the passage of the yarn 12 on. In the channel 54 is according to 4 a feed tube 86 for the yarn 12 provided, which is fixed, so not with the rotor 14 co-rotates. The yarn 12 is according to 3 in the rotor 14 deflected by an angle of less than 90 °. In the rotor 14 the nozzle function is integrated, with a nozzle unit to fulfill the nozzle function 16 serves. The nozzle unit 16 is in the channel 54 of the rotor 14 arranged. The nozzle unit 16 is via a sealed circulation gap 56 preferably supplied with compressed air. About the air flow cooling can be achieved and / or moisture in the converter 10 and thus the cutting properties of the yarn 12 be managed.

A cutting edge 18 is about a holder described in more detail below 58 stationary in front of the rotor 14 or in front of a front side 26 of the rotor attached. In addition, a second cutting edge 20 provided, which as counter-blade to the first cutting edge 18 acts. The second cutting edge 20 is rotatably mounted. In the present embodiment, the cutting edge 20 on the rotor 14 attached and rotated in the direction of rotation 90 with the rotor 14 With. However, it is also conceivable that the second cutting edge 20 is rotatably mounted on another component. The cutting 18 . 20 are preferably made of steel, hard metal, ceramic or a hybrid material of, for example, any mixture of the aforementioned materials. Furthermore, the cutting edges 18 . 20 additionally have a coating, for example of a carbon compound such as diamond. Alternatively, the use of a laser, in particular a diode laser, as a cutting edge is conceivable.

The second cutting edge 20 is above one in the front 26 located outlet opening 22 of the yarn 12 arranged, with the outlet opening 22 can have any distance from the axis of rotation of the rotor. The first, fixed edge 18 is so in front of the rotor 14 arranged that after every full rotation of the rotor 14 the cutting edges 18 . 20 are aligned in a μm-exactly set distance.

The yarn fed with uniform and / or stepped speed, which can also be varied via a step program 12 is through the nozzle unit 16 in the channel 54 of the rotor 14 introduced. The yarn 12 will be in the channel 54 to the exit opening 22 passed and the open yarn end is from the outlet opening 22 expelled. At every revolution of the rotor 14 happens the co-rotating second cutting edge 20 the fixed first cutting edge 18 where the yarn 12 itself at the rotation between the cutting edges 18 . 20 pulls and gets cut.

The two cutting edges 18 . 20 work like a pair of scissors, especially like a cutting scissors. By the rotation of the second cutting edge 20 need to cut the two 18 . 20 always meet again. To make a cut of the yarn 12 to enable are the cutting edges 18 . 20 arranged in two different planes that are parallel to each other. As a borderline case would also be possible that the cutting 18 . 20 are arranged in the same plane. The cutting edges acting as scissors 60 . 62 the cutting 18 . 20 at the time of the meeting and the execution of the cut are in one plane. Here are the cutting edges 18 . 20 or the cutting edges 60 . 62 at the time of the cut only one touch point at a time, which is in the process of cutting and thus in a sliding past the cutting edges 18 . 20 along the longitudinal extent of the cutting edges 60 . 62 emotional.

As already mentioned, the two cutting edges 18 . 20 with their cutting edges 60 . 62 μm-exactly matched to each other to ensure an exact cut of the tough fibers 12 To achieve, for example, aramid fibers, so that the shock-sensitive cutting materials suffer no damage and a long life of cutting 18 . 20 can be achieved. For this purpose is an actuating means 92 for the cutting 18 . 20 provided, wherein the adjusting means 92 for aligning the cutting edges 18 . 20 serves. It is for example on the holder 58 the second cutting edge 18 arranged. By means of the actuating means 92 For example, a tilt and / or a bias of the cutting 18 . 20 be set. In 8th is a schematic representation of the tilting example, based on the second cutting edge 20 , shown. Here are the cutting edges 18 . 20 adjusted so that both cut 18 . 20 in each case by the longitudinal extension of their cutting edges 60 . 62 extending axis 98 are twisted with the same sense of rotation. This results in a large-area contact of the cutting surfaces in the longitudinal extension of the cutting 18 . 20 stopped and the cutting edges 60 . 62 only touch at a point in the cutting process along the cutting edges 60 . 62 emotional. Furthermore, at least one cutting edge 20 in another axis 100 with a tilt 94 arranged tilted. Alternatively, the cutting edge 20 also in a center 102 be twisted on its support surface. This results in a point contact of the cutting edges 60 . 62 , which, neglecting the deformation along the longitudinal extent of the cutting edges 60 . 62 due to the mutual tension during the cut, lie in one plane. Furthermore, a bias is given, which is the voltage between the cutting edges 18 . 20 increases and thus improves the quality of cut. As an alternative to this tilt can also on at least one cutting edge 20 a shape 96 be provided in the form of a curvature.

4 shows an adjustment 24 in which the rotor 14 the rotor nozzle 14 . 16 at least partially from a fixed component 64 surrounded, which is the holder 58 for the first cutting edge 18 receives. The holder 58 has a connection element 66 on, at which over one, essentially in the direction of a transverse axis 68 movable adjusting element 70 the first cutting edge 18 is attached. The connecting element 66 has one of the adjustment 70 to the cutting edge 18 running slope or slope 72 less than 4 °, preferably 2 °. In a recess 74 of the connecting element 66 is a spring element, preferably a plate spring 76 or a package of disc springs 76 , provided, together with one, at the recess 74 provided recess 78 that a subarea 88 of a connecting element reduced to about one third of its width to about 11 mm, an elastic partial deformation of the connecting element 66 allows.

Will the adjusting element 70 along the slope 72 of the connecting element 66 shifted, can be a coarse adjustment of the cutting 18 . 20 be achieved. For example, a displacement of 3 mm corresponds approximately to a change in a gap 80 between the cutting edges 60 . 62 in its horizontal extension of 100 microns. In the desired position, the adjusting element 70 fixed. For fine adjustment, the diaphragm spring 76 used, whereby a kerf can be adjusted to a fiber thickness of a fiber strand. about a change in the biasing force of the spring 76 is about the deformation of the partially elastic connecting element 66 the gap 80 adjusted in its vertical extent. In this case, for example, the gap 80 be changed by 1 micron when the spring 76 is adjusted by 15 °.

After the cut, the fibers should be used for the direct production of a nonwoven or a fiber bed. Advantageously, the cut or severed fibers should fall directly onto the resulting web or fiber bed. The strength of the supplied compressed air flow, however, has an effect on the fall or the storage of the fibers. In order to prevent turbulence and flying away of the cut and blown fibers, according to the invention a collecting device 28 according to 5 provided a box 30 and one in the box 30 opening shaft 32 includes, wherein the box 30 and the shaft 32 can be made in one piece. The shaft 32 surrounds the cutting edges 18 . 20 and thus prevents blowing away of the cut fibers. In addition, the collection device 28 an extraction device 34 on. As a rule, the cut fibers are heavier than air and automatically fall down. If this automatism is disturbed, the suction device 34 For example, intervene by applying a vacuum supportive. In addition, a separating device is in the form of at least one baffle 36 provided, which separates air and fibers from each other.

According to 6 is also a device with several Rotordüsekonvertern 10 conceivable, in which case only one rotor nozzle converter per row is provided with a reference number. The rotor nozzle converters 10 For example, they may be in opposite directions 82 . 84 turn, so that a twisting "twisted" or "twisted" fiber strand is possible. The device preferably has a common drive 38 on, the part or all Rotordüsekonverter 10 driving. The rotor nozzle converters 10 can, for example, according to 6 be arranged behind one another or zigzag, so that as a common belt drive a belt loop in the form of a toothed belt 38 with double-sided gearing comes into question, which between the two rows of Rotordüsekonverter 10 runs. In this case, the two rows each rotate in opposite directions 82 . 84 ,

The rotor nozzle converter 10 serves not only to convert the continuous yarns into staple fibers, but also to meter the amount of fiber per unit time and / or the desired length of fiber pieces. The length adjustment is above the feeding speed of the yarn 12 and / or the rotational speed of the rotor 14 adjustable, whereby a continuous metering is possible.

7 shows a converter 40 for converting one or more continuous yarns into staple fibers having a yarn or fiber exit 44 and a cutting edge 46 , wherein the yarn outlet 44 fixed and the cutting edge 46 is rotatably mounted. In the present embodiment, several yarn leaks 44 around a rotatably mounted cutting edge 46 arranged so that the cutting edge 46 cuts several fibers in one revolution. In addition, in particular for cutting tough fibers, a second cutting edge 48 be provided. Preferably, the second cutting edge 48 mounted stationary and acts as a counter-blade to the first cutting edge 46 ,

LIST OF REFERENCE NUMBERS

10

Rotordüsekonverter

12

yarn

14

Rotor nozzle (rotor)

16

Rotor nozzle (nozzle unit)

18

first cutting edge

20

second cutting edge

22

outlet opening

24

adjustment

26

front

28

catcher

30

box

32

shaft

34

Absaugungseinrichtung

36

Separating device (guide plate)

38

apron belts

40

converter

44

Garnaustritt

46

first cutting edge

48

second cutting edge

50

storage

52

Drive (belt guide)

54

channel

56

circumferential gap

58

bracket

60

Cutting edge (first edge)

62

Cutting edge (second cutting edge)

64

fixed component

66

connecting element

68

transverse axis

70

adjustment

72

slope

74

recess

76

Belleville spring

78

recess

80

gap

82

direction of rotation

84

direction of rotation

86

feed

88

subregion

90

direction of rotation

92

actuating means

94

tilt

96

formation

98

axis

100

axis

102

Focus

Claims (26)

Rotary nozzle converter ( 10 ) for converting one or more continuous yarns ( 12 ) in staple fibers by means of a rotor nozzle ( 14 . 16 ) and a cutting edge ( 18 ), wherein the nozzle function in the rotor ( 14 ) is integrated and the yarn is deflected by an angle of less than 90 °. Rotary nozzle converter according to claim 1, characterized by a second cutting edge ( 20 ). Rotary nozzle converter according to claim 2, characterized in that the second cutting edge ( 20 ) is provided as a counter cutting edge to the first cutting edge ( 18 ) to act. Rotary nozzle converter according to claim 2 or 3, characterized in that the second cutting edge ( 20 ) is rotatably mounted. Rotordüsekonverter at least according to claim 2, characterized in that the second cutting edge ( 20 ) on the rotor ( 14 ) is attached. Rotordüsekonverter at least according to claim 2, characterized in that the second cutting edge ( 20 ) segmentally an end face ( 26 ) of the rotor nozzle ( 14 . 16 ) covered. Rotordüsekonverter at least according to claim 2, characterized in that a cutting edge ( 62 ) of the second cutting edge ( 20 ) a secant to an exit opening ( 22 ) of the yarn ( 12 ). Rotordüsekonverter at least according to claim 2, characterized in that at least one cutting edge ( 60 ) of the first cutting edge ( 18 ) and at least one cutting edge ( 62 ) of the second cutting edge ( 20 ) in at least one mode of operation in a common plane. Rotordüsekonverter at least according to claim 2, characterized in that in at least one operating mode, the first cutting edge ( 18 ) and the second cutting edge ( 20 ) are biased against each other. Rotordüsekonverter at least according to claim 9, characterized in that at least one cutting edge ( 60 ) of the first cutting edge ( 18 ) and at least one cutting edge ( 62 ) of the second cutting edge ( 20 ) a tilt ( 94 ), which is intended, in a cutting operation by means of the cutting edges ( 60 . 62 ) a force component between the cutting edges ( 18 . 20 ). Rotordüsekonverter at least according to claim 9, characterized in that at least one cutting edge ( 60 ) a shaping ( 96 ), which is intended, in a cutting operation by means of the cutting edges ( 60 . 62 ) a force component between the cutting edges ( 18 . 20 ). Rotordüsekonverter at least according to claim 2, characterized in that a cutting edge ( 60 ) of the first cutting edge ( 18 ) and a cutting edge ( 62 ) of the second cutting edge ( 20 ) are provided, a section of the yarn ( 12 ) according to a scissor principle. Rotary nozzle converter according to one of the preceding claims, characterized by an adjusting device ( 24 ) for at least one cutting edge ( 18 . 20 ). Rotordüsekonverter according to claim 13, characterized in that the adjusting device ( 24 ) a part intended for elastic deformation ( 88 ) having. Rotary nozzle converter according to one of the preceding claims, characterized by a collecting device ( 28 ) for the staple fibers. Rotordüsekonverter according to claim 15, characterized in that the collecting device ( 28 ) a box ( 30 ) and one in the box ( 30 ) opening shaft ( 32 ) having. Rotary nozzle converter according to claim 16, characterized in that the shaft ( 32 ) the cutting edges ( 18 . 20 ) surrounds. Rotordüsekonverter according to any one of claims 14 to 17, characterized in that the collecting device ( 28 ) an extraction device ( 34 ) having. Rotordüse converter according to one of claims 14 to 18, characterized in that the collecting device ( 28 ) a separating device ( 36 ) having. Rotordüsekonverter according to claim 19, characterized in that it is at the separating device to at least one baffle ( 36 ). Device with a plurality of rotor nozzle converters according to one of the preceding claims. Apparatus according to claim 21, characterized by a drive ( 38 ), which the Rotordüsekonverter ( 10 ) drives at least partially. Rotordüsekonverter according to claim 22, characterized in that it is in the drive to a belt drive with a belt ( 38 ), which has a double-sided toothing. Converter ( 40 ) for converting one or more continuous yarns into staple fibers having a yarn exit ( 44 ) and a cutting edge ( 46 ), whereby the yarn outlet ( 44 ) fixed and the cutting edge ( 46 ) is rotatably mounted. Converter according to Claim 24, characterized by a second cutting edge ( 48 ). Converter according to claim 25, characterized in that the second cutting edge ( 48 ) is fixedly mounted and as a counter-blade to the first cutting edge ( 46 ) acts.

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