EP3322844B1 - Cooling drum for cooling a thread plug - Google Patents

Description

The invention relates to a cooling drum for cooling a yarn plug in a texturing process according to the preamble of claim 1.

A generic cooling drum for cooling a yarn plug is from the DE 196 13 177 A1 known.

The known cooling drum has a drivable cooling jacket, which contains a plurality of air-permeable guideways on the periphery for receiving a plurality of juxtaposed guided yarn plug. In the interior of the cooling jacket, a suction chamber is formed, which is connected via a suction connection with a vacuum source. Within the suction chamber, a shielding means in the form of a diaphragm is arranged, which covers a partial segment of the cooling jacket in which no thread plug is guided on the circumference. In addition, the cooling jacket still has radially projecting into the suction chamber dividers to improve the air flow. In operation, a negative pressure is generated within the suction chamber, so that an ambient air is sucked in from outside the cooling jacket and flows through the yarn plugs and thus cools. At the same time, the vacuum of the suction chamber ensures that the thread plugs do not come loose from the guideways on the circumference of the cooling jacket. At the end of the cooling process, the yarn plug on the circumference of the cooling drum is dissolved into a thread and withdrawn at high speed from the circumference of the cooling jacket.

In the known cooling drum, the separating webs circulating with the cooling jacket within the suction chamber lead to considerable air turbulences and an undesirable pressure drop, so that relatively high negative pressures must be generated in the suction chamber, so that sufficient cooling air can be sucked in to cool the yarn plugs. In addition, large-area segment sections must be sucked on the cooling jacket, so that a significant amount of foreign air enters the suction chamber. However, the high negative pressures hinder in particular the dissolution of the yarn plug to a thread. Due to the negative pressure, the filaments of the thread are pressed against the guideway and partially pulled into the perforation. This leads to high loading of the thread and to reduce the curl of the thread.

Furthermore, the thread is pulled after the dissolution of the yarn plug at a high yarn speed over part of the guideway. In this situation, the negative pressure within the suction chamber creates a holding force on the thread which increases the contact and thus the risk of abrasion and damage to the thread.

It is therefore an object of the invention to develop a cooling drum for cooling a yarn plug of the generic type such that a cooling of the yarn plug is possible with a relatively low negative pressure within the suction chamber.

Another object of the invention is to provide a generic cooling drum in which a gentle resolution of the yarn plug is possible to a crimped yarn.

This object is achieved in that the shielding means is formed by a closed sealing jacket, which is assigned to the cooling jacket substantially coaxially at a distance and having an air slot in the region of the guide track.

Advantageous developments of the invention are defined by the features and feature combinations of the subclaims.

The invention has the particular advantage that the suction losses are minimized. Thus, a suction flow is generated only in the guide region of the yarn plug on the circumference of the cooling jacket. For this purpose, the suction chamber is directly connected directly to the guideway on the circumference of the cooling jacket via an air slot within the sealing jacket. All other areas are shielded by the sealing jacket. In that regard, the cooling drum according to the invention is particularly suitable to allow for low energy consumption cooling of a yarn plug.

Depending on the process and the yarn denier, it is usual that the cooling section of the yarn plug is limited to a partial looping around the circumference of the cooling jacket. For this purpose, it is provided that the air slot extends over a partial circumference of the sealing jacket. In this case, the angular range of the air slot on the circumference of the sealing jacket with a wrap of the yarn plug on the circumference of the cooling jacket vote so that, for example, in a release point of the yarn plug no negative pressure effect is generated on the guideway.

In principle, however, processes are possible in which the yarn plug can be guided with several wraps on the circumference of the cooling jacket. In this case, the development of the invention is provided, in which the air slot is formed spirally on the circumference of the sealing jacket. Thus, even larger wraps of a yarn plug on the circumference of the cooling jacket can be easily sucked through a louver of the sealing jacket.

In order not to hinder in particular the dissolution of the yarn plug, the development of the invention is preferably carried out, in which at least one sealing strip is arranged on the circumference of the sealing jacket, which forms a sealing gap with respect to the cooling jacket and which is associated with one end of the air slot. This positioning and separation of a force acting on the guideway suction zone is possible. The sealing strip between the sealing jacket and the cooling jacket prevents the negative pressure from propagating into an annular space formed between the cooling jacket and the sealing jacket.

In a partial looping of the yarn plug on the circumference of the cooling jacket, a second sealing strip is preferably provided on the circumference of the sealing jacket, which forms a ring segment-shaped suction zone between the cooling jacket and the sealing jacket with the arranged at the opposite end of the sealing strip. This makes it possible that both the emergence of a yarn plug and the dissolution of the yarn plug is particularly gentle.

In order to compensate for possible dimensional deviations in the annular gap between the cooling jacket and the sealing jacket, is furthermore provided that the sealing strips are formed radially elastic. This leaves a high sealing effect against the vacuum-free zones of the cooling jacket.

For improved sealing, a further variant of the cooling drum according to the invention is particularly advantageous, in which the cooling jacket has on an inner side two sealing rings which enclose the guideway between them and each rest with a sealing lip on the circumference of the sealing jacket. This can be advantageous to seal the end faces of the annular suction zone between the cooling jacket and the sealing jacket. This is particularly avoided that foreign air is sucked in from the environment.

In order to produce an intensive cooling air flow for cooling the yarn plug, the development of the invention has proven successful, in which the guide track is formed on the circumference of the cooling jacket by a circumferential perforated plate between two spacers, wherein the cooling jacket has a row of holes of shell openings below the perforated plate. Thus, the effect of the negative pressure over the cross-sectional areas of the perforation in the cooling jacket can be led directly to the underside of the perforated plate, so that the cooling air is sucked through the perforated plate. The perforated plate has a fine porosity in order to hinder the entry of filaments.

In particular, the dissolution of the yarn plug in a dissolution point on the circumference of the cooling jacket can be improved by the development of the invention, in which on an inner side of the sealing jacket, a compressed air channel is formed by at least one blow opening the guideway is connected and which is connectable to a compressed air source. Thus, in particular, the detachment of the thread from the guide track on the circumference of the cooling drum can be favored. Damage to the thread and possible wear on the guideway are completely avoided.

For simultaneous cooling of a plurality of yarn plugs, the development of the invention is provided, in which the cooling jacket has a plurality of parallel air-permeable guideways, wherein one of a plurality of air slots is formed on the sealing casing per guideway.

The drive of the cooling jacket is preferably via a driven drive shaft which is connected via an outer end wall to the cooling jacket. In this case, the drive shaft penetrates a hollow support, on which the sealing jacket is arranged over an inner end wall. In that regard, an intensive encapsulation of the suction chamber can be realized by the sealing jacket within the cooling jacket.

The suction port is advantageously formed opposite to the inner end wall, so that the suction chamber is essentially limited by the sealing jacket and the inner end wall.

The cooling drum according to the invention will be explained in more detail with reference to some embodiments with reference to the accompanying figures.

Fig. 1

schematisch eine Seitenansicht eines ersten Ausführungsbeispiels der erfindungsgemäßen Kühltrommel

Fig. 2

schematisch eine Längsschnittansicht des Ausführungsbeispiels aus Fig. 1

Fig. 3

schematisch eine Querschnittsansicht des Ausführungsbeispiels aus Fig. 1

Fig. 4

schematisch eine Querschnittsansicht eines weiteren Ausführungsbeispiels der erfindungsgemäßen Kühltrommel

Fig. 5

schematisch ein Ausschnitt einer Längsschnittansicht des Ausführungsbeispiels aus Fig. 4

Fig. 6

schematisch eine Querschnittsansicht eines weiteren Ausführungsbeispiels der erfindungsgemäßen Kühltrommel

Fig. 7

schematisch ein Ausschnitt einer Längsschnittansicht des Ausführungsbeispiels aus Fig. 6

Fig. 8

schematisch eine Seitenansicht eines weiteren Ausführungsbeispiels der erfindungsgemäßen Kühltrommel

They show:

Fig. 1

schematically a side view of a first embodiment of the cooling drum according to the invention

Fig. 2

schematically a longitudinal sectional view of the embodiment of Fig. 1

Fig. 3

schematically a cross-sectional view of the embodiment of Fig. 1

Fig. 4

schematically a cross-sectional view of another embodiment of the cooling drum according to the invention

Fig. 5

schematically a section of a longitudinal sectional view of the embodiment of Fig. 4

Fig. 6

schematically a cross-sectional view of another embodiment of the cooling drum according to the invention

Fig. 7

schematically a section of a longitudinal sectional view of the embodiment of Fig. 6

Fig. 8

schematically a side view of another embodiment of the cooling drum according to the invention

In the Fig. 1 . 2 and 3 a first embodiment of the cooling drum according to the invention is shown in several views. Fig. 1 shows a side view, Fig. 2 a longitudinal sectional view and Fig. 3 a cross-sectional view of the embodiment. Unless expressly made to any of the figures, the following description applies to all figures.

The embodiment of the cooling drum according to the invention has an annular cooling jacket 1. At the periphery of the cooling jacket 1, a guide track 2 is formed for receiving a yarn plug. In this embodiment, the guideway 2 is curved by a Perforated plate 4 is formed, which is arranged between two spacers 3.1 and 3.2. The spacers 3.1 and 3.2 are firmly connected to the circumference of the cooling jacket 1. The perforated plate 4 is permeable to air with a plurality of smallest openings. Below the perforated plate 4, the cooling jacket 1 has a plurality of shell openings 5, which surround the cooling jacket 1 as a row of holes.

As in particular from the representations in Fig. 2 and 3 shows, inside the cooling jacket 1, a suction chamber 11 is formed. The suction chamber 11 is separated by a shielding means 10 from the cooling jacket 1 and an outer end wall 7. The shielding means 10 is formed in this embodiment by an annular closed sealing jacket 10.1, which is held by a laterally arranged to the sealing jacket 10.1 inner end wall 13. Die Dichtmantel 10.1 ist mit dem Gehäuse 12 verbunden. The closed inner end wall 13 is arranged on a projecting hollow support 8 and extends parallel to the outer end wall 7. In this case, the hollow support 8 is penetrated by the drive shaft 6.

In the plane of the guideway 2, an air slot 15 is formed on the sealing jacket 10.1. The air slot 15 extends over a partial circumference of the sealing jacket 10.1. The length of the air slot 15 is selected in response to a plug wrap of the yarn plug which is required for cooling and dissolving the thread. The Teilumschlingung the thread plug is <360 °.

As in particular from the illustration in Fig. 2 shows, the inner suction chamber 11 is limited by a plate-shaped collar 16 of the hollow support 8. At the collar 16, a suction connection 9 connects, which in This embodiment is formed by a suction nozzle 14. The suction nozzle 14 is for this purpose connected to the hollow carrier 8. Within the suction nozzle 14 8 more suction openings 12 are formed on the collar 16 of the hollow carrier. The suction openings 12 are opposite the inner end wall 13.

In operation, the cooling jacket 1 is driven in rotation via the drive shaft 6. In this case, a yarn stopper produced in a texturing process is received on the circumference of the cooling jacket 1 within the guideway 2 and guided over a partial looping on the cooling jacket 1. The formed in the interior of the sealing jacket 10.1 suction chamber 11 is connected via the suction openings 12 and the suction nozzle 14 to a vacuum source. In that regard, a negative pressure is generated in the suction chamber 11. The negative pressure in the suction chamber 11 causes a suction flow at the air slot 15, which acts on the guideway 2. As a result, a cooling air from the environment via the guide rail 2 and the air slot 15 is sucked into the suction chamber 11 and discharged via the suction port 14. The ambient air penetrates the adjacent to the periphery of the perforated plate 4 yarn stopper and penetrates the cooling jacket 1 through the shell openings 5 through to the air slot 15, insofar as a targeted suction flow is generated only in the region of the guideway 2. In conventional processes, sufficient cooling currents can thus be generated at the guideway 2 even at low negative pressures.

In this case, the ratio of the perforated plate 4 to the shell openings 5 and to the air slot 15 can be optimized in terms of flow. Thus, the opening cross-sections and the distances to each other can be varied. In general, the perforated plate 4 with respect to the shell openings 5 and the shell openings 5 with respect to the air slot 15 has a larger opening cross-section.

In order to suck in as little external air as possible in order to avoid leakage currents is in the Fig. 4 and 5 another embodiment of a cooling drum according to the invention shown. In Fig. 4 is a schematic cross-sectional view and in Fig. 5 schematically a section of a longitudinal sectional view shown.

The embodiment according to Fig. 4 and 5 is essentially identical to the embodiment according to Fig. 1 to 3 , so only the differences are explained here to avoid repetition.

At the in Fig. 4 and 5 illustrated embodiment, the ends of the louver 15 are assigned two sealing strips 17.1 and 17.2. The sealing strips 17.1 and 17.2 are arranged on the circumference of the sealing jacket 10.1 and form a sealing gap 18 relative to the cooling jacket 1. The sealing strips 17.1 and 17.2 are designed to be elastic when rotating the cooling jacket 1 possible tolerance deviations in the gap between the sealing jacket 10 and the cooling jacket. 1 to be able to compensate. The sealing strips 7.1 and 17.2 are aligned axially and close to the circumference of the sealing jacket 10.1 an annular suction zone 19 a.

As in particular from the illustration in Fig. 5 shows, the sealing strips 17.1 and 17.2 extend substantially over the entire width of the sealing jacket 10.1. Since the sealing strips 17.1 and 17.2 are identical, is in Fig. 5 only the sealing strip 17.1 shown.

In order to seal the suction zone formed between the sealing strips 17.1 and 17.2 at the front, the cooling jacket 1 has at its ends in each case a groove 22.1 and 22.2, in which a respective sealing ring 20.1 and 20.2 is held. The sealing rings 20.1 and 20.2 have at a free projecting end a sealing lip 21.1 and 21.2, which are in sliding contact with the circumference of the sealing jacket 10.1. In that regard, there is a closed suction zone 19 in the transition region between the sealing jacket 10.1 and the cooling jacket 1 below the guideway 2. Thus, a very targeted cooling air generation without significant losses possible. This in Fig. 4 and 5 illustrated embodiment is particularly energy-saving and allows with relatively low pressures intensive cooling of a run on the circumference of the guideway 2 yarn plug.

By the radial seals 22.1 and 22.2 and the sealing strips 17.1 and 17.2 is virtually a closed space opposite the suction chamber 11 and the environment forms. Thus, this space could have an overpressure relative to the environment in order to obtain a blowing stream in the dissolution area at the circumference of the guideway 2 for improved removal of the thread. The room could also have a negative pressure relative to the environment to cause a suction flow.

The length of the louver on the partial circumference of the sealing jacket 10.1 and the arrangement of the sealing strips 17.1 and 17.2 is selected such that, for example, the inlet of the yarn plug is laid in the angular range of the sealing strip 17.1. The following in the running direction of the cooling jacket 1 (indicated by arrow) sealing strip 17.2 represents the area in which a resolution of the yarn plug and a deduction of Thread on the circumference of the cooling jacket takes place. In particular, the dissolution and removal of the thread can be placed in a non-evacuated zone of the cooling jacket 1.

To facilitate the drainage of the thread from the guideway 2 is in Fig. 6 and 7 another embodiment of the cooling device according to the invention shown. The Fig. 6 schematically shows a cross-sectional view and Fig. 7 schematically a section of a longitudinal sectional view. The embodiment according to Fig. 6 and 7 is essentially identical to the embodiment according to Fig. 4 and 5 so that only the differences are explained below.

At the in Fig. 6 and 7 illustrated embodiment of the cooling drum according to the invention, a compressed air passage 23 is formed within the cooling jacket 1, which is connected via a blowing opening 24 with the guide track 2. The compressed air channel 23 is connectable via a formed on the collar 16 compressed air connection 25 with a compressed air source, not shown here.

As from the illustration in Fig. 6 shows, the compressed air channel 23 is disposed on the sealing jacket 10.1 in an angular position in which a thread is released from the yarn plug and removed. In that regard, the detachment of the thread from the guideway 2 is supported in operation by a slight blast flow which impinges on the perforated plate 4 via the blow opening 24 via the shell opening. In that regard, yarn friction and Filamentverhakungen can be avoided on the pore-shaped perforated plate 4.

In practice, it is also common to simultaneously cool a plurality of yarn plugs at the periphery of a cooling drum. For cooling a plurality of yarn plugs, the cooling drum according to the invention is particularly suitable, as shown in the illustration of a further embodiment Fig. 8 evident. At the in Fig. 8 illustrated embodiment, a half of the image as a side view and a second image half are shown as a longitudinal sectional view. Since the embodiment of the basic structure identical to the embodiments according to Fig. 1 to 6 is, the components of the same function are provided with identical reference numerals.

A cooling jacket 1 is connected via an outer end wall 7 to a drive shaft 6. At the periphery of the cooling jacket 1 a plurality of parallel adjacent to each other encircling guideways 2 are formed. The guideways 2 are formed by a plurality of spacers 3.1 to 3.4 and a plurality of perforated plates 4. The perforated plate 4 is U-shaped and has a variety of finest perforations. Each of the perforated plates 4 is assigned a row of holes 5 of several shell openings 5 in the cooling jacket 1.

Within the cooling jacket 1, an annular sealing jacket 10.1 is provided, which has one of a plurality of air slots 15 at the height of the guideways 2. Thus, each guideway 2 at the periphery of the coolant 1 associated with a louver 15.

The sealing jacket 10.1 is fixedly connected via an inner end wall 13 with a stationary hollow carrier 8. The hollow support 8 has on the collar side opposite the inner end wall 13 on the collar 16 a plurality of suction openings 12, which are connected via a suction nozzle 14 with a vacuum source, not shown here.

At the in Fig. 8 illustrated embodiment of the cooling drum according to the invention can thus lead several yarn plugs simultaneously with a Teilumschlingung on the circumference of the cooling jacket and cool.

In principle, however, it is also possible to guide a yarn plug with a multiple wrap on a cooling drum. Also for this purpose, the cooling drum according to the invention is well suited.

The in the Fig. 1 to 8 illustrated embodiments of the cooling drum according to the invention are exemplary in construction and construction of the items. In principle, similar constructions can be chosen to produce a targeted suction flow across louvers of a sealing mantle. Thus, the illustrated embodiments with their characteristics can be combined arbitrarily to obtain new variants.

The invention is characterized by a particularly gentle thread treatment. Due to low negative pressures, the size and discharge channels of the suction air can be reduced.

Claims (12)

1. Cooling drum for cooling a thread plug in a texturing process, having a drivable cooling jacket (1), at least one air-permeable guide track (2) for guiding the thread plug being configured on the circumference of said cooling jacket (1), having a suction chamber (11) that is configured in the interior of the cooling jacket (1) and that is connected to a suction connector (9) and to a stationary shielding means (10) which shields the suction chamber (11) from the cooling jacket (1),
   characterized in that
   the shielding means (10) is formed by a closed sealing jacket (10.1) which is assigned to the cooling jacket (1) at a spacing therefrom so as to be substantially coaxial with the latter, said sealing jacket (10.1) in the region of the guide track (2) having an air slot (15).
2. Cooling drum as claimed in claim 1,
   characterized in that
   the air slot (15) extends over a part-circumference of the sealing jacket (10.1).
3. Cooling drum as claimed in either of claims 1 and 2,
   characterized in that
   the air slot (15) is configured in a helical manner on the circumference of the sealing jacket (10.1).
4. Cooling drum as claimed in one of claims 1 to 3,
   characterized in that
   at least one sealing strip (17.1, 17.2) which in relation to the cooling jacket (1) forms a sealing gap (18) and is assigned to one end of the air slot (15) is disposed on the circumference of the sealing jacket (10.1).
5. Cooling drum as claimed in claim 4,
   characterized in that
   a suction zone (19) in the form of annular segments is configured by a second sealing strip (17.1, 17.2) on the circumference of the sealing jacket (10.1) between the cooling jacket (1) and the sealing jacket (10.1), wherein the air slot (15) extends within the suction zone (19).
6. Cooling drum as claimed in either of claims 4 and 5,
   characterized in that
   the sealing strips (17.1, 17.2) are configured so as to be radially elastic.
7. Cooling drum as claimed in one of claims 1 to 6,
   characterized in that
   the cooling jacket (1) on an internal side has two sealing rings (20.1, 20.2) which therebetween enclose the guide track (2) and which in each case by way of a lip seal (21.1, 21.2) bear on the circumference of the sealing jacket (10.1).
8. Cooling drum as claimed in one of claims 1 to 7,
   characterized in that
   the guide track (2) on the circumference of the cooling jacket (1) is formed by an encircling perforated metal sheet (4) between two spacers (3.1, 3.2), wherein the cooling jacket (1) below the perforated metal sheet (4) has a perforation row of jacket openings (5).
9. Cooling drum as claimed in one of claims 1 to 8,
   characterized in that
   a compressed-air duct (23) which is connected to the guide track (2) by way of at least one blower opening (24) and is connectable to a compressed-air source is configured on an internal side of the sealing jacket (10.1).
10. Cooling drum as claimed in one of claims 1 to 9,
    characterized in that
    the cooling jacket (1) has a plurality of air-permeable guide tracks (2) that are configured so as to be beside one another in parallel, wherein one of a plurality of air slots (15) is configured per guide track (2) on the sealing jacket (10.1).
11. Cooling drum as claimed in one of claims 1 to 7,
    characterized in that
    the cooling jacket (1) is connected to a drive shaft (6) by way of an external end wall (7), and in that the sealing jacket (10.1) by way of an internal end wall (13) is fastened to a hollow support (8), wherein the drive shaft (6) penetrates the hollow support (8).
12. Cooling drum as claimed in claim 11,
    characterized that
    the suction connector (9) is configured so as to be opposite the internal end wall (13) by way of which the suction chamber (11) is to be connected to a vacuum source.

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