DE10111598A1 - The godet roller, for use with melt spun filaments, has a spring to apply a static pressure to the roller bearings and an actuator, operated by compressed air, to adjust the spring pressure according to the working conditions - Google Patents

Abstract

The godet roller, to feed or draw or heat melt spun filaments, has a roller mantle (1) to carry the filaments. A spring (7) is between the roller bearings (4,5) to generate a static boost pressure force. A controlled actuator (8) generates a tension which is aligned to the static boost pressure on the roller bearings. The specification is an addition to 10058757.7. The godet roller, for use with melt spun filaments, has a controlled actuator to generate a tension which gives a static boost pressure on the roller bearings above the minimum level when in operation. The actuator is a piston/cylinder unit, between the drive shaft (2) and the carrier (3), with a step piston (9) in a spaced ring around the drive shaft. The end side of the piston is against a roller bearing (5), and forms a pressure zone with the carrier. The pressure zone is connected to a compressed air supply (18) through a control valve (17). A second actuator can be fitted, to relieve pressure, and counter the pressure of the spring against the roller bearings, as a piston/cylinder unit between the drive shaft and the carrier. Both actuators are controlled to keep the spring pressure above a minimum level, when the roller is in operation. Both actuators can have a common step piston, with axial movement, in a ring spaced around the drive shaft, with one end side against a roller bearing to form two pressure zones with the carrier. The pressure zones are connected alternately to a compressed air supply through at least one control valve. A number of cooling channels are at the roller bearings and/or cooling zones are in or at the carrier, connected separately or together to the compressed air supply. Each cooling channel/cooling zone has an opening for the escape of the compressed air. The compressed air supply is a compressor.

Description

The invention relates to a godet for conveying, stretching or tempering melt-spun threads according to the preamble of claim 1 of the main patentes (patent application 100 58 757.7).

Such godets are used in the textile industry for stretching and tempering. ren of melt-spun synthetic threads. Here, a or several threads on the circumference of a rotating godet jacket. Übli The godets are usually equipped with individual drives, the godets and the drive are arranged on a common shaft. Especially when Fast spinning occurs depending on the diameter of the godet casing speed up to 10,000 rpm or even up to 14,000 rpm. The Galette jacket overhung by means of roller bearings, whereby in addition to the high Speeds also have a negative impact on the thermal load in the case of heated godets affects the life of the bearings. From DE 37 01 077 A1 is for example as known such a godet, in which the godet jacket rotatably with is connected to a shaft. The shaft is spaced apart by two arranged rolling bearings stored in a carrier. In this arrangement acts between an axial preload force to absorb axial forces.

In the case of high-speed rolling bearings, the value of the axial forward is particularly important tension of the rolling bearings of great importance for the process of rolling body on the track. However, it cannot be guaranteed that the axial preload with changing external loads, speed-dependent Centrifugal forces and some gyroscopic moments on the rolling elements and at Tempe  temperature changes are always kept at an optimal operating point. deviate The optimal operating point leads to a shortening of the bearing length service life.

Accordingly, it is an object of the invention to provide a godet of the type mentioned to further develop such that a change in the preload of the rolling bearings in Depending on the respective operating state is possible.

Another object of the invention is to provide a bearing for a godet jacket To make available, in which in particular thermally-related preload changes are avoided.

The object is achieved according to the invention by a godet with the features Claim 1 solved.

Compared to the main patent (patent application 100 58 757.7) shows that phases often occur during the operation of a godet in which a change in the preload between the roller bearings is not desired and thus the effect of a static, unchangeable pre-tensioning force tension of the roller bearings is sufficient.

The invention is characterized in that in addition to a static leader By changing the preload of the roller bearings by an additional clamping force is cash. Via a force sensor between the roller bearings, which is preferably used as a compression spring is formed, he will first a static biasing force testifies so that a minimal slip of the rolling elements at the same time as possible low load on the bearings is guaranteed. To in certain operating states Being able to set the higher preload forces is also a controllable one Actuator provided, which generates a clamping force that is rectified to the static preload force of the force encoder acts on the rolling bearings. With that forms  the sum of the pretensioning force generated by the force transmitter and that by the Actuator generated clamping force the total preload of the rolling bearings.

In a particularly advantageous development of the invention, the actuator is for Generation of the clamping force controllable in such a way that the preload of the rolling bearings in operation above a determined by the applied static preload th minimum preload is changeable. This can be used for the different loading operating conditions of the storage, the cheapest preload is set the. For example, when starting the preload can be an additional Liche clamping force increase so that the starting slip is reduced. With ver different speeds, a bias voltage can be selected such that the the most favorable compromise between bearing load due to preload and wear due to slippage is achieved. However, it is also possible to use the La influence rigidity by changing the axial preload, so that the position of the resonance speeds can be influenced. This allows the increased stress on the storage and its environment caused by the large Vibration amplitudes arise during resonance operation or passage through resonance, be reduced. Overall, the life of the bearing can be Increase the smoothness of the godet.

The actuator is preferably powered by a pressurized piston cylinder unit formed, which is arranged between the drive shaft and the carrier. because with high clamping forces in a compact design in a simple way produce.

For this purpose, the piston-cylinder unit has an axially movable stepped piston, which surrounds the shaft in a ring at a distance and with an end face on egg the bearing is in contact. On the opposite face of the stepped column bens, a pressure chamber is formed between the carrier and the stepped piston, the pressure chamber being connected to a compressed air source via a control valve is.  

In order to increase the possible variations of the preload force, according to ei ner advantageous development of the invention, a second actuator is provided cher generates a relaxation force that is opposite to the static front force of the force encoder acts on the roller bearings.

By controlling the actuators, the tension and relaxation force can be adjusted be changed such that the preload of the rolling bearings in operation below a minimum preload determined by the applied static preload voltage is changeable.

The second actuator is preferably also a compressed air column petrol cylinder unit formed between the drive shaft and the carrier is arranged.

In order to maintain a high level of integration of the actuators, a common seed stepped piston both for generating the clamping force and for generating the relaxation force between the step piston and the carrier two Pressure chambers formed, which have at least one control valve with compressed air source are connected. This can be achieved through mutual pressurization the pressure chambers generate a tension or a relaxation force.

To change the preload due to thermal influences in the rolling To avoid storage, the godet is preferably designed according to claim 9.

A godet with the features of claim 10 represents another Lö solution for stabilizing the pretensioning forces Rolling bearings from several cooling channels and / or cooling rooms in or on the carrier formed, each individually or jointly connected to the compressed air source are. This means that compressed air is generated within the cooling channels or the cooling rooms current led, the direct cooling of the Wälzla as cooling air flow  environment or the rolling bearing. By connecting compressed air source is a uniform flow through the cooling channels or cold rooms guaranteed within the beam in the area of the rolling bearings.

For the exchange of the cooling air, an opening is provided through which the in the cooling air flow to the environment in the cooling ducts or cold rooms can be delivered. Thereby, thermally induced pre-tensioning can be carried out Avoid changes, so that only changes due to loading of the rolling bearings derbar operating conditions require a corresponding bias adjustment gene.

The compressed air source is preferably formed by a compressor, wherein a partial flow of the compressor to generate the clamping force or the relaxation force and a second partial flow of the compressor immediately Cooling the rolling bearing is used.

Some embodiments of the godet of the invention are shown below described with reference to the accompanying drawings.

They represent:

Fig. 1 shows schematically a cross section through a first embodiment of the godet according to the invention;

Fig. 2 shows schematically the bearing point of the godet according to the invention according to Fig. 1;

Fig. 3 schematically shows another embodiment of a bearing of the godet inventions.

In Fig. 1 a Galette according to the invention with a single drive is shown for drawing and maintaining the temperature of melt-spun synthetic filaments. Here, the components relevant to the invention are represented by a cross section. The godet has a drive shaft 2 . The drive shaft 2 is mounted on the bearings 4 and 5 in a hollow cylindrical carrier 3 . At a protruding end of the drive shaft 2 , a godet casing 1 is rotatably connected to the drive shaft 2 . On the opposite side of the carrier 3 , the drive shaft 2 is coupled to a drive 6 . The drive 6 is designed as an electric gate, wherein a rotor 36 is connected to the drive shaft 2 and is enclosed by a stator 35 .

The carrier 3 has a collar 24 on the circumference, through which the godet unit is to be attached to a machine frame. On the circumference of the carrier 3 , a sleeve-shaped heat sink 37 with external cooling fins 38 is hen vorgese.

Within the carrier 3 , the roller bearings 4 and 5 are each received in a receiving bore of the carrier 3 . As a rule, two inclined ball bearings are used, which are axially fixed to the drive shaft 2 on both sides with their inner rings. A force transmitter 7 and an actuator 8 act between the outer rings of the roller bearings 4 and 5 in order to generate the preload between the roller bearings 4 and 5 .

The structure and function of the bearing point is shown in Fig. 2 as a partial incision Darge. The following description therefore applies to both FIG. 2 and FIG. 1.

The roller bearings 4 and 5 are each taken in a receiving bore in the carrier 3 . The inner rings 4.1 and 5.1 of the roller bearings 4 and 5 are fixed on the drive shaft 2 . The outer rings 4.2 and 5.2 of the roller bearings 4 and 5 are supported radially on the carrier 3 . The outer ring 4.2 of the rolling bearing 4 is axially fixed by the shoulder 25 on the carrier 3 . The shoulder 25 is designed in the form of a web and surrounds the drive shaft 2 in a ring at a small distance. On the opposite side of the rolling bearing 4 , an axial stop surface 26 is formed on the shoulder 25 . On the stop surface 26 , a force transmitter 7 is supported in the form of a compression spring which is arranged at the front end of an axially displaceable piston 9 . On the circumference of the stepped piston 9 , a plurality of pressure springs 7 are arranged in order to produce a uniform pretensioning force distributed over the circumference for bracing the roller bearings 4 and 5 . The stepped piston 9 lies with its opposite end face 13 on the outer ring 5.2 of the rolling bearing 5 . The stepped piston 9 is annular and forms with the drive shaft 2 an annular air gap 14th The outer diameter of the Stufenkol ben 9 is guided in the receiving bore of the carrier 7 .

A diameter step 27 is formed on the step piston 9 at the end of the step piston 9 facing the shoulder 25 . For this purpose, the stepped piston 9 has a small-diameter centering projection 28 which protrudes from between the shoulder 25 and the drive shaft 2 . Between the set 25 and the centering shoulder 28 of the stepped piston 9 , a seal 12.1 is provided. Between the receiving bore of the carrier 3 and the outer diameter of the stepped piston 9 , a second seal 12.2 is provided. Since a pressure chamber 10, which is sealed off from the outside via the seals 12.1 and 12.2, is formed between the stepped piston 9 and the carrier 3 . The pressure chamber 10 is connected to a compressed air source 18 from the outside via a pressure channel 11 . For this purpose, a control valve 17 is connected between the pressure chamber 10 and the compressed air source 18 .

Between the roller bearing 4 and the shoulder 25 , a cooling space 15.1 is formed, which is connected to the compressed air source 18 via a cooling channel 16.1 and a throttle 19 . A further cooling space 15.2 is formed between the stepped piston 9 and the roller bearing 5 and is connected to an opening 20 via a bore 29 and the cooling channel 16.2 .

In the godet shown in Fig. 1, the drive shaft 2 is rotatably supported by means of the axially preloaded roller bearings 4 and 5 . Here, a static preload force is generated via the force generator 7 , which generates a minimum preload of the roller bearings 4 and 5 . The force transmitter 7 is formed by a plurality of compression springs and is stretched between the shoulder 25 of the carrier 3 and the stepped piston 9 acting on the roller bearing 5 . In principle, the force transmitter could also be formed, for example, by a plate spring pack or a screw or press connection for generating a static biasing force.

In order to increase the preload of the roller bearings 4 and 5 , a compressed air provided by the compressed air source 18 is passed via the pressure valve 11 into the pressure chamber 10 via the control valve 17 . The compressed air within the pressure chamber 10 acts on the end face of the stepped piston 9 on the diameter step 27 , so that an additional clamping force is generated, which acts on the outer ring 5.2 of the bearing 5 via the stepped piston 9 . In this case, only a clamping force is effective, which acts on the roller bearings 4 and 5 in addition to the static preload force generated by the force generator 7 .

To cool the roller bearings 4 and 5 , a partial flow of the compressed air source 18 is conducted via a throttle 19 via the cooling channel 16.1 into the cooling space 15.1 . The cooling air flow is passed from the cooling space 15.1 via the air gap 14 between the stepped piston 9 and the drive shaft 2 to the adjacent roller bearing 5 . The drive shaft 2 is cooled, which is a particular advantage in the case of heated godets. The cooling air flow then occurs in the cooling space 15.2 immediately in front of the roller bearing 5 . The cooling air flow is passed from the cooling space 15.2 through the bore 29 to the cooling channel 16.2 . The cooling channel 16.2 is connected to the opening 20 , which allows the cooling air to flow out. By adjusting the throttle 19 , the air flow branched off for cooling can be set as desired. As a compressed air source 18 is preferably used in the compressor, so that a connection to a compressed air network is possible.

In Fig. 3 a further embodiment of a bearing point of the godet according to the invention is shown schematically. This exemplary embodiment is essentially identical to the previous exemplary embodiment, so that only the differences are shown in the following description.

In order to adjust the preload force between the roller bearings 4 and 5 , two actuators 8.1 and 8.2 are provided in addition to the force transmitter 7 . The actuators 8.1 and 8.2 are each formed by a piston-cylinder unit, the carrier 3 acting as the cylinder and the stepped piston 21 acting as the piston. The stepped piston 21 has the diameter steps 27 and 30 . The diameter step 27 is ausgebil det on the step piston 21 identical to the previous embodiment. So far, reference is made to the preceding description. For the realization of a second diameter step 30 at the stepped piston 21 of the differential piston 21 has a ridge-shaped extension 31, which projects into a recess 32 in the carrier 3 in the central area on the screen. A seal 12.3 is arranged between the projection 31 and the recess 32 . The recess 32 is delimited by a bushing 33 , which is supported on the circumference on the carrier 3 and forms the receiving bore for receiving the rolling bearing 5 in the inner region. The end face of the stepped piston 21 acts with the end face 13 un indirectly on the outer ring of the rolling bearing 5 . Another seal 12.4 is arranged between the circumference of the step piston 21 and the bush 33 . The seals 12.3 and 12.4 thus form a pressure chamber 23 between the Stu fenkolben 21 , the carrier 3 and the socket 33rd The pressure chamber 23 is connected to a control valve 34 via the pressure channel 11.2 . The control valve 34 is also connected via the pressure channel 11.1 to the pressure chamber 22 at the front end of the stepped piston 21 . The control valve 34 is connected to a compressed air source 18 . The annular space formed between the seals 12.2 and 12.3 is vented through a relief channel 39 .

To cool the roller bearings 4 and 5 , a partial flow is also discharged via the throttle 19 from the compressed air source 18 and via the cooling duct 16.1 , the cooling space 15.1 , the air gap 14 , the cooling space 15.2 , the bore 29 and the cooling duct 16.2 to one Opening 20 out.

In the embodiment shown in Fig. 3, the drive shaft of the inventive he godet by the axially preloaded roller bearings 4 and 5 gela gert. For adjusting the axial preload of the compression springs 7, a first actuator 8.1 is additionally formed by the piston-cylinder unit 21/3 with the pressure chamber 22 and the diameter step 27th In this case, a flow of compressed air is introduced via the pressure valve 11.1 into the pressure chamber 22 via the control valve 34 . In the pressure chamber 22, the compressed air acts on the diameter step 27 of the step piston 21 , so that a clamping force is generated which acts directly on the outer ring 5.2 of the rolling bearing 5 via the step piston 21 . In this case, the pressure chamber 23 in the second piston-cylinder unit is relieved and depressurized.

In the event that a low preload pressure, which is below the predetermined spring preload by the pressure springs 7 , is desired, pressure is applied to the pressure chamber 23 via the control valve 34 . In this case, the pressure chamber 22 is relieved. The pressure medium thus acts on the diameter step 30 of the step piston 21 , so that a relaxation force is generated on the step piston 21 , which acts counter to the direction of force of the pressure springs 7 . The outer ring 5.2 of the roller bearing 5 is thus relieved, so that the acting between the roller bearings 4 and 5 preload is reduced.

In the above-mentioned exemplary embodiments, changes were made to the front voltage pneumatically acting actuators are used. The Kombina tion between power generation and cooling the particular advantage that Undich activities in the area of the piston-cylinder unit directly into a cooling circuit arrive and can be removed.

In principle, however, it is possible to use other pressure sources that are used for provide a liquid medium, for example, to apply forces to the stepped piston produce.  

LIST OF REFERENCE NUMBERS

1

godet

2

drive shaft

3

carrier

4

roller bearing

4.1

inner ring

4.2

outer ring

5

roller bearing

5.1

inner ring

5.2

outer ring

6

drive

7

Power transmitter, compression spring

8th

actuator

9

stepped piston

10

pressure chamber

11

pressure channel

12

poetry

13

front

14

air gap

15

refrigerator

16

cooling channel

17

control valve

18

Compressed air source

19

throttle

20

opening

21

stepped piston

22

pressure chamber

23

pressure chamber

24

Federation

25

paragraph

26

stop surface

27

Diameter step

28

Spigot

29

drilling

30

Diameter step

31

approach

32

recess

33

Rifle

34

control valve

35

stator

36

rotor

37

heatsink

38

cooling fins

39

vent channel

Claims (12)

1.Gallet for conveying, stretching or tempering melt-spun threads with a godet jacket ( 1 ) over which the threads are guided, with a drivable drive shaft ( 2 ) which is connected to the godet jacket ( 1 ) and which is connected to at least two roller bearings ( 4 , 5 ) is rotatably mounted in a carrier ( 3 ), wherein between the roller bearings ( 4 , 5 ) an axial preload acts according to the main patent (patent application 100 58 757.7), characterized in that a force transmitter ( 7 ) between the roller bearings ( 4 , 5 ) is arranged, which generates the static preload force, and that a controllable actuator ( 8 ) is provided, which generates a tension force that is directed in the same direction as the static preload force of the force generator ( 7 ) on the roller bearings ( 4 , 5 ) acts. 2. godet according to claim 1, characterized in that the actuator ( 8 ) for generating the clamping force is controllable in such a way that the preload of the rolling bearings ( 4 , 5 ) can be changed in operation above a predetermined minimum by the applied static preload. 3. Galette according to claim 1 or 2, characterized in that the actuator (8) with compressed air is formed by a piston-cylinder unit (9/3), which is arranged between the drive shaft (2) and the support (3). 4. godet according to claim 3, characterized in that the piston-cylinder unit has an axially movable stepped piston ( 9 ) which surrounds the drive shaft in a ring at a distance, which rests with an end face ( 13 ) on one of the roller bearings ( 5 ) and which forms a pressure chamber ( 10 ) with the carrier ( 3 ), the pressure chamber ( 10 ) being connected to a compressed air source ( 18 ) via a control valve ( 17 ). 5. godet according to any one of the preceding claims, characterized in that a second actuator ( 8.2 ) is provided and that a relaxation force can be generated by the second actuator ( 8.2 ), which is opposite to the static biasing force of the force generator ( 7 ) on the roller bearings ( 4 , 5 ) acts. 6. godet according to claim 5, characterized in that the second actuator ( 8.2 ) and the first actuator ( 8.1 ) for generating the clamping and relaxing forces can be controlled such that the preload voltage of the rolling bearings ( 4 , 5 ) in operation below a can be changed by the static pretensioning force. 7. Galette according to claim 5 or 6, characterized in that the second actuator (8.2) with compressed air is formed by a piston-cylinder unit (21/3), which is arranged between the drive shaft (2) and the support (3) , 8. godet according to claim 7, characterized in that the piston-cylinder units of the two actuators ( 8.1 , 8.2 ) have a common axially movable stepped piston ( 21 ) which surrounds the drive shaft ( 2 ) in a ring at a distance, with an end face ( 13 ) abuts one of the roller bearings ( 5 ) and forms two pressure chambers ( 22 , 23 ) with the carrier, the pressure chambers ( 22 , 23 ) being alternately connected to a compressed air source ( 18 ) via at least one control valve ( 34 ). 9. godet according to one of claims 4 to 8, characterized in that in the area of the rolling bearings ( 4 , 5 ) a plurality of cooling channels ( 16.1 , 16.2 ) and / or cooling rooms ( 15.1 , 15.2 ) in or on the carrier ( 3 ) ausgebil det are each individually or jointly connected to the compressed air source ( 18 ). 10. godet for guiding threads with a godet casing ( 1 ), over which the threads are guided, with a drivable drive shaft ( 2 ) which is connected to the godet casing ( 1 ) and which can be rotated with at least two roller bearings ( 4 , 5 ) is mounted in a carrier, an axial preload acting between the roller bearings ( 4 , 5 ), characterized in that in the region of the roller bearings ( 4 , 5 ) a plurality of cooling channels ( 16.1 , 16.2 ) and / or cooling rooms ( 15.1 / 15.2 ) in or are formed on the carrier ( 3 ), each of which is individually or jointly connected to the compressed air source ( 18 ). 11. godet according to claim 9 or 10, characterized in that at least one with the cooling channels ( 16.1 , 16.2 ) and / or the cooling spaces ( 15.1 , 15.2 ) connected opening ( 20 ) is provided, through which a through the compressed air source ( 18th ) generated cooling air flow can escape. 12. godet according to one of claims 4 to 11, characterized in that the compressed air source ( 18 ) is formed by a compressor.