EP3322844A1

EP3322844A1 - Cooling drum for cooling a thread plug

Info

Publication number: EP3322844A1
Application number: EP16736429.8A
Authority: EP
Inventors: Claus Matthies
Original assignee: Oerlikon Textile GmbH and Co KG
Current assignee: Oerlikon Textile GmbH and Co KG
Priority date: 2015-07-13
Filing date: 2016-07-06
Publication date: 2018-05-23
Anticipated expiration: 2036-07-06
Also published as: CN107849751A; WO2017009122A1; US10072363B2; EP3322844B1; US20180187346A1

Abstract

The invention relates to a cooling drum for cooling a thread plug in texturing process. The cooling drum comprises a drivable cooling jacket, on the circumference of which at least one air-permeable guide track is designed for guiding the thread plug. A suction chamber is provided in the interior of the cooling jacket, which chamber is connected via a suction connection to a vacuum source. In this way, a stationary shielding means is provided, which is arranged between the cooling jacket and the suction chamber. In order to produce a suction flow which is as targeted as possible and affected by little loss, according to the invention, the shielding means is formed by a closed sealing jacket which is placed substantially coaxially spaced apart with the cooling jacket and has an air slot in the region of the guide track.

Description

Cooling drum for cooling a yarn plug

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 known from DE 196 13 177 AI.

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 thread 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 undesired 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, after the thread plug has been released, the thread is pulled over a part of the guideway at a high thread speed. 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 can be coordinated with a looping region of the yarn plug on the circumference of the cooling jacket such that, for example, no negative pressure effect is produced on the guide track in a release point of the thread stopper. 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 sealing strip at the opposite end. This makes it possible that both the emergence of a yarn plug as well as the release of the yarn plug is particularly gentle.

In order to be able to compensate for possible dimensional deviations in the annular gap between the cooling jacket and the sealing jacket, desweit- ren 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 makes it advantageous to seal the end sides 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 on the cross-sectional surfaces of the perforation in the cooling jacket can be carried 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 further development of the invention is provided in which the cooling jacket has a plurality of air-permeable guide tracks formed parallel to one another, one of a plurality of air slots being formed on the sealing casing per guide track.

The drive of the cooling jacket is preferably via a driven drive shaft which is connected via an outer end wall with 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 is explained in more detail below with reference to some embodiments with reference to the accompanying figures.

They show: Fig. 1 shows schematically a side view of a first embodiment of the cooling drum according to the invention

FIG. 2 is a schematic longitudinal sectional view of the embodiment of FIG. 1. FIG

3 is a schematic cross-sectional view of the embodiment of FIG. 1

Fig. 4 shows schematically a cross-sectional view of another embodiment of the cooling drum according to the invention

5 schematically shows a detail of a longitudinal sectional view of the embodiment from FIG. 4

Fig. 6 shows schematically a cross-sectional view of another embodiment of the cooling drum according to the invention

7 shows schematically a detail of a longitudinal sectional view of the embodiment from FIG. 6

Fig. 8 shows schematically a side view of another embodiment of the cooling drum according to the invention

In Figs. 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 is a longitudinal sectional view and Fig. 3 is 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 can be seen in particular from the illustrations in FIGS. 2 and 3, a suction chamber 11 is formed in the interior of the cooling jacket 1. 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 can be seen in particular from the representation in FIG. 2, the inner suction chamber 11 is delimited by a plate-shaped collar 16 of the hollow carrier 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 guide track 2 and guided over the cooling jacket 1 via a partial looping. The formed in the interior of the sealing jacket 10.1 suction chamber 11 is connected via the suction ports 12 and the suction nozzle 14 connected 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, another embodiment of a cooling drum according to the invention is shown in FIGS. 4 and 5. FIG. 4 schematically shows a cross-sectional view and in FIG. 5 a section of a longitudinal section view. The embodiment of FIGS. 4 and 5 is substantially identical to the embodiment of FIGS. 1 to 3, so that at this point only the differences will be explained to avoid repetition.

In the embodiment shown in Fig. 4 and 5, the ends of the air slot 15, two sealing strips 17.1 and 17.2 assigned. 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 with respect to the cooling jacket 1. The sealing strips 17.1 and 17.2 are designed to be elastic upon rotation of 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 can be seen in particular from the representation in FIG. 5, 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, only the sealing strip 17.1 is shown in FIG. 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, a closed suction zone 19 results in the transition region between the sealing jacket 10.1 and the cooling jacket 1 below the guide track 2. Thus, a very targeted generation of cooling air without significant losses is possible. The exemplary embodiment illustrated in FIGS. 4 and 5 is particularly energy-saving in this respect and permits intensive cooling of a yarn plug guided on the circumference of the guideway 2 with relatively low negative pressures. 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 for improved detachment of the thread in the dissolution area at the circumference of the guideway 2. 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. In order to facilitate the drainage of the thread from the guide track 2, a further embodiment of the cooling device according to the invention is shown in FIGS. 6 and 7. Fig. 6 shows schematically a cross-sectional view and Fig. 7 shows schematically a detail of a longitudinal sectional view. The exemplary embodiment according to FIGS. 6 and 7 is essentially identical to the exemplary embodiment according to FIGS. 4 and 5, so that only the differences will be explained below.

In the embodiment of the cooling drum according to the invention shown in Fig. 6 and 7, a compressed air passage 23 is formed within the cooling jacket 1, which is connected via a blow 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 is apparent from the illustration in Fig. 6, the compressed air channel 23 is arranged on the sealing jacket 10.1 in an angular position in which a thread is released from the yarn plug and withdrawn. 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 can be seen from the illustration of a further embodiment according to FIG. 8. In the embodiment shown in FIG. 8, a half of the image is shown as a side view and a second half of the image as a longitudinal sectional view. Since the embodiment of the basic structure is identical to the embodiments of FIGS. 1 to 6, 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 opposite side to the inner end wall 13 collar side on the collar 16 a plurality of suction openings 12, the clip on a suction 14 are connected to a vacuum source, not shown here. In the embodiment of the cooling drum according to the invention illustrated in FIG. 8, a plurality of yarn plugs can thus be guided and cooled at the same time with a partial looping around the circumference of the cooling jacket.

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 embodiments of the cooling drum according to the invention shown in FIGS. 1 to 8 are exemplary in the construction and construction of the individual parts. In principle, similar constructions can be chosen to produce a targeted suction flow across louvers of a sealing mantle. Thus, the illustrated embodiments can be combined with their features as desired in order to obtain new versions of the 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

claims

Cooling drum for cooling a yarn plug in a texturing process with a drivable cooling jacket (1), on whose circumference at least one air-permeable guide track (2) is designed to guide the yarn plug, with a suction chamber (11) formed inside the cooling jacket (1), which is connected to a suction connection (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) is, which is assigned to the cooling jacket (1) is substantially coaxial with the distance and in the region of the guide track (2) has a louver (15).

Cooling drum according to claim 1, characterized in that the air slot (15) extends over a partial circumference of the sealing jacket (10.1).

Cooling drum according to claim 1 or 2, characterized in that the air slot (15) is formed spirally on the circumference of the sealing jacket (10.1).

Cooling drum according to one of claims 1 to 3, characterized in that on the circumference of the sealing jacket (10.1) at least one sealing strip (17.1, 17.2) is arranged, which opposite the cooling jacket (1) forms a sealing gap (18) and the one end of the Louvette (15) is assigned. Cooling drum according to claim 4, characterized in that a ring-segment-shaped suction zone (19) between the cooling jacket (1) and the sealing jacket (10.1) is formed by a second sealing strip (17.1, 17.2) on the circumference of the sealing jacket (10.1), wherein the Louvette (15) extends within the suction zone (19).

Cooling drum according to claim 4 or 5, characterized in that the sealing strips (17.1, 17.2) are formed radially elastic.

Cooling drum according to one of claims 1 to 6, characterized in that the cooling jacket (1) on an inner side two sealing rings (20.1, 20.2) which enclose the guide track (2) between them and each with a sealing lip (21.1, 21.2) rest against the circumference of the sealing jacket (10.1).

Cooling drum according to one of claims 1 to 7, characterized in that the guide track (2) on the circumference of the cooling jacket (1) by a circumferential perforated plate (4) between two spacers (3.1, 3.2) is formed, wherein the cooling jacket (1) Having below the perforated plate (4) has a row of holes of shell openings (5).

Cooling drum according to one of claims 1 to 8, characterized in that on an inner side of the sealing jacket (10.1) a compressed air channel (23) is formed, which is connected by at least one blow opening (24) with the guide track (2) and with a compressed air source is connectable. Cooling drum according to one of claims 1 to 9, characterized in that the cooling jacket (1) has a plurality of parallel adjacent air-permeable guideways (2), wherein on the sealing jacket (10.1) per guideway (2) one of a plurality of air slots (15) is formed ,

Cooling drum according to one of claims 1 to 7, characterized in that the cooling jacket (1) via an outer end wall (7) with a drive shaft (6) is connected and that the sealing jacket (10.1) via an inner end wall (13) on a hollow support (8) is fixed, wherein the drive shaft (6) penetrates the hollow support (8).

Cooling drum according to claim 11, characterized in that the suction port (9) opposite to the inner end wall (13) is formed, through which the suction chamber (11) is to be connected to a vacuum source.