WO1999061692A1

WO1999061692A1 - Godet roll for guiding, heating and conveying a thread

Info

Publication number: WO1999061692A1
Application number: PCT/EP1999/003478
Authority: WO
Inventors: Dieter Zenker; Klaus Rippstein; Walter Ritter; Matthias Otto; Bernd Erhard Kummelt; Rainald Voss
Original assignee: Barmag Ag
Priority date: 1998-05-28
Filing date: 1999-05-20
Publication date: 1999-12-02
Also published as: CN1272153A; DE19980953D2

Abstract

The invention relates to a godet roll for guiding, heating and conveying a running synthetic thread. A rotating, hollow cylindrical godet roll case is mounted on a projecting, stationary, hollow cylindrical support. A heating device for heating said godet roll case is located on the periphery of the projecting support, between the godet roll case and the support. The godet roll is driven by an electromotor which is mounted on the support essentially coaxially to the godet roll case. The godet roll also has a channel system for cooling purposes, said channel system guiding a liquid coolant and extending over the peripheral area of the bearing and/or the peripheral area of the electromotor.

Description

Galette for guiding, heating and conveying a thread

The invention relates to a godet for guiding, heating and conveying a synthetic thread according to the preamble of claim 1.

Such a godet is known from EP 0 589 685.

Especially in spinning machines with high take-off speeds and winding speeds, such godets are used for guiding, heating and conveying a running synthetic thread. For this purpose, the known godet unit has a godet casing which is at least partially wrapped around the thread and is connected to an electric motor by a long projecting shaft. To avoid high bending and vibration loads, the shaft is supported with a bearing at the end of a cantilevered beam. A heating device is attached to the circumference of the carrier, which heats the cup-shaped godet casing placed over the carrier from the inside. At today's spinning speeds of well over 1,000 m / min, the bearings of the godet are designed as high-speed bearings, which are operated at very high speeds and which require a long service life. These enormous loads lead on the one hand to a relatively high thermal energy in the electric drive and to a warming of the bearings. The problem thus arises that the operating temperatures of the bearings are reached and exceeded very quickly. In particular, the bearings arranged in the area of the heating device quickly reach their limits.

Furthermore, the further development of processes for thread production leads to ever higher thread forces and, due to increasing production speeds, to higher wind losses. Both parameters have an effect in the form of an increased power requirement of the drive motor of the godet. To in the To be able to transfer the same amount of heat to the shorter dwell time of the thread on the godet jacket, an increase in the surface temperature of the godet jacket and thus an increase in the heater output is necessary. With the same installation space of the godet, the thermal loads on the units increase considerably.

The invention is therefore based on the object of developing a godet for conveying, heating and guiding a running synthetic thread of the type mentioned at the outset in such a way that rapid and uniform heat dissipation from the area of the bearings and the drive is ensured. Another object of the invention is to increase the godet output with a constant or small size by increasing the power density of the units.

The solution to the problem results from the features of claim 1.

Further advantageous developments of the invention are defined in the subclaims.

The invention has the advantage that, on the one hand, overheating of the bearings, in particular by the heating device arranged on the outer circumference of the carrier, is avoided and, on the other hand, the thermal energy emitted by the electric motor is dissipated quickly and uniformly. The use of a liquid cooling medium in the duct system enables heat to be removed quickly and evenly. In addition, the cooling medium can be brought through the channel system essentially to every location to be cooled within the godet. In order to carry out the heat dissipation evenly, the cooling medium is preferably introduced continuously into the duct system.

In order to increase the performance of the heating device, according to an advantageous development of the invention the support of the heating device is carried out the channel system, which extends at least partially over the circumferential region of the carrier, is cooled

In a particularly preferred development of the godet according to the invention, the bearings are in a hollow cylindrical bearing part of the carrier and the

Electric motor arranged in a housing part of the carrier The bearing part and that

Housing parts are connected to each other via an annular flange and can be cooled by the duct system

The godet casing can be loaded over the entire length without generating a significant bending moment. Furthermore, there is a relatively uniform one

Load on the bearings without the between the godet and the

Heating device leads to overheating of the bearings

Storage and drive in two separate sections of the carrier, an individual coordination between drive and cooling as well as storage and cooling can be carried out.The bearing part, the housing part and the flange can be formed by a one-piece support or by a support composed of several parts his

In a particularly advantageous development, the channel system extends essentially over the entire length of the bearing part and over the entire length of the housing part. This prevents heating of the rotor shaft. An inlet and an outlet of the channel system are formed on the housing part of the carrier and connected to the pump

In one exemplary embodiment, the rotor shaft is supported by two roller bearings inside the cooled bearing part. A hub of the godet casing is fastened to the free, projecting end of the rotor shaft In order to achieve a uniform cooling effect over the circumferential region of the bearings and over the circumferential region of the electric motor, it is particularly advantageous to arrange a multiplicity of essentially axially aligned channel sections on the circumference of the carrier. The channel sections are interconnected. This results in a meandering channel system on the circumference of the carrier.

In a further exemplary embodiment of the godet according to the invention, the channel system is helical on the circumference of the carrier. A uniform temperature control of the bearings is achieved in the circumferential direction.

By means of a corresponding modular system, the electric motor and the heater of the godet can be designed with liquid or air cooling according to a preferred development of the invention, depending on the power requirement with a constant or smaller construction volume. A godet with a wide performance range is available, the outer envelope and functional dimensions of which change only insignificantly. Since the electric motor must be passed through a corresponding opening in the machine wall to mount the godet to the machine, the flange connection and opening to the machine can thus remain unchanged over the entire performance range of the godet.

When using a solid support, the formation of the channel system by closed grooves or bores is particularly advantageous. The design of the godet, in which the duct system is formed by a pipe coil, offers a very flexible cooling system.

However, it is also possible to combine the channel system with holes and

Execute coils. For example, the channel system in the

Circumferential area of the electric motor can be designed as a coil. The channel system in the area of the bearing part, however, could be grooves or bores be introduced into the carrier. The channel system would thus be formed by two subsystems that are connected to one another.

In order to operate the storage of the godet in the narrowest possible temperature range, the design of the godet according to the invention is particularly advantageous, in which the channel system is arranged with a pump and with a heat exchanger to form a cooling circuit carrying the cooling medium. The cooling circuit can be designed in an open or closed design. It is also possible to design the duct system according to the heat pipe principle. A condensable coolant is guided in the channel system. At an operating temperature of the bearings below 100 ° C, water can preferably be used as the cooling medium. Here, the temperature can be regulated very evenly, for example by a thermostat, which leads to low voltages, particularly in the vicinity of the bearings.

It is just as advantageous to use an oil as the cooling medium. With such a cooling medium, which can also be used at high and low operating temperatures, the bearings can be lubricated at the same time by the particularly preferred development of the invention. For this purpose, the duct system is connected to a bearing via a line in such a way that a secondary flow of the cooling medium is passed directly through the bearing. In addition to cooling the bearing, this secondary flow also lubricates the bearing.

In a particularly advantageous development of the godet according to the invention, a metering device, for example in the form of a solenoid valve, is arranged in the line between the channel system and the bearing, which metered the bypass flow. The quantity of lubricant can thus be predetermined so that no major losses of cooling medium can occur. In order to collect the excess cooling medium emerging from the bearing and to return it to the system or collect it separately, in a further development of the invention the bearings are arranged within the bearing part in an annular chamber formed between the shaft or the hub and the bearing part. The annular chamber is liquid-tight towards the outside. The excess cooling medium occurring within the annular chamber can then advantageously be removed from the annular chamber via an outlet.

Further advantages and features of the invention will now be explained in more detail using some exemplary embodiments with reference to the accompanying drawings.

Show it:

1 schematically shows a longitudinal section through a first embodiment of the godet according to the invention; 2 schematically shows a longitudinal section through a further exemplary embodiment of the godet according to the invention; 3 schematically shows a view of a carrier with a channel system of a godet; 4 and 5 schematically show a longitudinal section through further exemplary embodiments of the godet according to the invention.

In Fig. 1, a longitudinal section through a godet is shown schematically. The godet consists of a godet casing 2, the godet casing 2 is pot-shaped and placed over a shaft 1. An end wall 9 of the godet casing 2 is fastened to the projecting end of the shaft 1. For this purpose, the end wall 9 has a hub 6 aligned concentrically with the godet casing 2. The end wall 9 and the hub 6 are penetrated by a bore which enlarges conically at the free end of the hub 6. A cone 7 is integrally formed on the projecting end of the shaft 1, said cone being positively connected to the hub 6 connected is. By means of a bracing element 8, the end wall 9 with the hub 6 is firmly braced on the cone 7 of the shaft 1. At the opposite end of the shaft 1, the shaft 1 is coupled to an electric motor 13. The electric motor 13 drives the shaft 1 and thus the godet casing 2.

The shaft 1 is supported in a hollow cylindrical projecting bearing part 3 of a fixed support 4 by the bearings 11 and 12. The bearing part 3 is enclosed by the godet casing 2 essentially over its entire length, so that an annular space 23 is formed between the stationary bearing part 3 and the rotatable godet casing 2. In the annular space 23, a heating device 22 is attached to the circumference of the bearing part 3. The heating device 22 has means for heating the rotating godet casing 2.

The carrier 4 has a housing part 5 on the side facing away from the bearing part 3. An installation space 24 is formed in the housing part 5 of the carrier. The electric motor 13 is introduced in the installation space 24 in such a way that the shaft 1 can be driven directly by the electric motor 13. The installation space 24 is closed by a cover 14 attached to the end face of the housing part 5. A supply connection 15 is attached in the cover 14. Electrical energy and data signals are transmitted to the electric motor and vice versa via the supply connection 15 and a transformer 16.

Between the bearing part 3 and the housing part 5, the carrier 4 has a flange part 25. The flange part 25 can be designed, for example, with bores or threads in order to fasten the godet in a machine frame. A channel system 10 is introduced into the walls of the carrier 4. The channel system 10 has an inlet 20 and an outlet 21 which are formed on the end face of the housing part 5. An inlet duct 18 opens into the inlet 20. The inlet duct 18 is introduced into the cover 14 and connects the inlet 20 to a pump 17. The outlet 21 is also connected to the pump 17 via an outlet duct 19 in the cover 14. The Channel system 10 is formed by a plurality of channel sections 26 in the bearing part 3 and by a plurality of channel sections 27 in the housing part 5. The channel sections 26 and 27 are each axially aligned evenly distributed over the circumference and interconnected.

In the godet shown in FIG. 1, one or more threads are guided on the circumference of the godet casing 2. For this purpose, the godet casing 2 is driven by the electric motor 13. By means of the heating device 23, the godet jacket 2 is previously heated to a temperature required for the heat treatment of the thread. The pump 17 conveys a cooling medium, for example water, via the inlet 20 into the channel system 10. The cooling medium flows through the channel sections 27 and 26 and exits the channel system via the outlet 21. Here, the thermal energy generated by the heating device 23 and the electric motor 13 is dissipated. The cooling medium stream emerging from the outlet 21 is tempered to a cooling temperature within the pump 17 and fed again into the cooling circuit.

A further exemplary embodiment of a godet according to the invention is shown schematically in FIG. For simplification, the components with the same function in the exemplary embodiment in FIG. 2 have been given the same reference numerals as the exemplary embodiment in FIG. 1.

In the embodiment of the godet according to the invention shown in FIG. 2, the carrier 4 also has a bearing part 3 and a housing part 5, which are connected to one another via a flange part 25. The bearing part 3 is covered in a pot shape by the godet casing 2, the godet casing being closed by the end wall 9 at the free end of the bearing part 3. A hub 6 is formed on the end wall 9 concentrically with the godet casing 2. The hub 6 extends essentially over the entire length of the godet casing 2. Thus, the bearing part 3 projects into the annular space 28 formed between the godet casing 2 and the hub 6. The bearings are between the hub 6 and the bearing part 3 11 and 12 arranged such that the hub 6 is rotatable relative to the fixed bearing part 3. The heating device 23 is attached to the circumference of the bearing part 3. At the free end of the hub 6, the hub 6 is connected to a rotor shaft 30 of the electric motor 13 by a coupling 29. The coupling is designed to be releasable. For this purpose, the electric motor 13 is introduced in the housing part 5 and, as already described for FIG. 1, is supplied with energy via the supply connection 15. A cover 14 is attached to the end face of the housing part 5.

A plurality of axially aligned channel sections 26 are introduced in the bearing part 5 to cool the godet. The channel sections 26 are connected to a coil 31 which is arranged on the circumference of the housing part 5. The pipe coil 31 is helical on the circumference of the housing 5. The pipe coil 31 is combined with the channel sections 26 introduced in the bearing part 3 to form a channel system 10 with a cooler circuit. The channel system 10 is connected to the pump 17 through a tubular inlet channel 18 and a tubular outlet channel 19. The exemplary embodiment of the godet from FIG. 2 is identical in its function to the exemplary embodiment in FIG. 1. Thus, reference is made at this point to the description of FIG. 1.

The formation of the pipe coil 31 on the circumference of the housing part 5 is exemplary. It is also possible to lay the pipe coil 31 in the installation space 24 directly on or in the inner walls of the housing part.

FIG. 3 schematically shows a view of a carrier 4 with a cooling device, as would be used, for example, in a godet according to FIG. 1 or FIG. 2. The carrier 4 can be composed of one part or of several parts, so that a bearing part 3, a flange part 25 and a housing part 5 result. The cooling device of the godet essentially consists of a channel system with axially oriented channel sections 27 and radially oriented channel sections 32. The channel sections 27 and 32 are assembled into a cooling circuit. The radially aligned channel sections 32 together form a helical course that wraps around the circumference of the bearing part 3. The channel sections 32 can in this case be formed by a tube coil which is inserted into a groove made in a helical manner on the circumference of the bearing part 3. For this purpose, the groove can be introduced in the inside diameter or on the outside diameter of the bearing part 3. On the free end face of the housing part 5, the channel system is connected to a pump 17 via an inlet 20. The liquid cooling medium is fed to a heat exchanger 33 via an outlet 21. The heat exchanger 33 is connected to the pump 17.

4 shows a further exemplary embodiment of a godet according to the invention. The exemplary embodiment of the godet from FIG. 4 is identical in its function and structure to the exemplary embodiment in FIG. 1. Thus, reference is made to the description of FIG. 1 at this point

In the exemplary embodiment of the godet in FIG. 4, the bearing 12 is connected to the channel system 10 via a line 34. Bearing 11 is also connected to duct system 10 via line 35. It is thereby achieved that the cooling medium - in this case an oil - enters the conduit 34 and 35 from the duct system 10 and flows directly through the bearing 12 and the bearing 11 as a secondary flow. This results in immediate cooling and lubrication of the bearings 11 and 12. Between the bearing 12 and the electric motor 13, a seal 36 is attached to the circumference of the shaft 1 and extends to the inner diameter of the bearing part 3. On the opposite side between the bearing 11 and the end wall 9, a further seal 37 is arranged on the circumference of the shaft 1, which also extends to the inner diameter of the bearing part 3. A liquid-tight annular chamber 38 is thus formed. The annular chamber 38 has an outlet 39 on the circumference of the bearing part 3. This configuration ensures that the cooling medium flowing through the bearings 11 and 12 can be collected and removed after leaving the bearings. Here is the Possibility to collect the collected cooling medium of the secondary flows separately or to return it directly to the cooling circuit.

In a further development of the exemplary embodiment from FIG. 4, which is not shown, a metering device for metering the bypass flow through the bearings is arranged in line 34 and in line 35. Throttles, valves or pumps can be used as metering devices, for example, which are advantageously electrically controllable. An essentially loss-free lubrication of the bearings 11 and 12 is thus possible. The cooling medium derived from the cooling circuit is also reduced to a minimum.

5 shows a further exemplary embodiment of a godet according to the invention. The exemplary embodiment of the godet from FIG. 5 is essentially identical in its function and structure to the exemplary embodiment in FIG. 2. Thus, reference is made to the description of FIG. 2 at this point.

In the exemplary embodiment of the godet in FIG. 5, the channel system 10 is designed only for cooling the bearings 11 and 12 and the heating device 22. The electric motor 13 is cooled by a fan 40 arranged on the free end of the electric motor on the motor shaft. For this purpose, the housing 5 of the electric motor is designed with axially extending cooling fins 41. The housing 5 of the electric motor 13 is fastened to the flange part 25 of the carrier 4. To cool the electric motor, the fan 40 is driven by the rotor shaft of the electric motor 13. This results in an air flow sweeping over the housing 5.

The channel system 10 is formed in the bearing part 3 and the flange part 25 of the carrier 4. A heat exchanger unit 33 is arranged on the flange part 25 and is enclosed with the channel system 10 via an inlet channel 18 and an outlet channel 19 in a cooling circuit. As a result, the heat transferred from the heating device 22 into the bearing part 3 is dissipated directly. Heating of the bearings 11 and 12 is avoided. The bearings are cooled around the circumference in accordance with the ducting.

The invention is particularly characterized in that the performance of the bearings, the power density of the electric motor and the performance of the heater can be increased with the same size, so that the godet performance is increased overall. The cooling device can be part of a modular system that enables the godet to be adapted to requirements within its performance range.

Reference list

Shaft, rotor shaft

Godet jacket

Bearing part

carrier

Housing part

hub

cone

Bracing element

bulkhead

Channel system

camp

Electric motor cover

Supply connection transmitter

Pump inlet duct

Outlet duct inlet

Outlet

Heating device

Annulus installation space

Flange part duct section duct section

Annulus

clutch Rotor shaft Pipe coil Duct sections Heat exchanger Line Pipe Seal Seal Ring chamber Outlet fan

Claims

claims

1. godet for guiding, heating and conveying a thread with a rotating hollow cylindrical godet jacket (2) which is rotatably mounted on a fixed, hollow cylindrical cantilever support (4) by means of bearings (11, 12) with a heating device (22) is arranged in an annular space (23) formed between the godet jacket (2) and the carrier (4) on the circumference of the carrier (4), with an electric motor (13) driving the godet jacket (2), which coaxial with the godet jacket (2) attached to the carrier (4), and with a cooling device, characterized in that the cooling device has a channel system (10) which carries a liquid cooling medium and which is at least partially over the peripheral region of the bearings (11, 12) and / or over extends the peripheral region of the electric motor (13).

Galette according to claim 1, characterized in that the channel system (10) extends at least partially over the peripheral region of the carrier (4) in order to dissipate the heat acting on the carrier (4) from the heating device (22).

3. godet according to claim 1 or 2, characterized in that the carrier has a hollow cylindrical bearing part (3) for mounting the godet casing (2) and a housing part (5) for receiving the electric motor (13), the bearing part (3) and the housing part (5) is connected to one another by an annular flange (25) of the carrier and can be cooled by the channel system (10).

4. godet according to claim 3, characterized in that the channel system (10) extends substantially over the entire length of the bearing part (3) and substantially over the entire length of the housing part (5) and that the channel system (10) by a Inlet (20) and an outlet (21) on

Housing part (5) of the carrier is connected to a heat exchanger (33).

5. godet according to claim 3 or 4, characterized in that a rotor shaft (1) of the electric motor (13) by bearings (11, 12) within the cooled bearing part (3) is mounted, which at its free end with a hub (6 ) of the godet casing (2) is firmly connected.

6. godet according to claim 3 or 4, characterized in that a with the godet casing (2) connected hub (6) by bearings (11, 12) within the cooled bearing part (3) is connected, the free end of which is connected to a rotor shaft (30) of the electric motor (13) is connected.

7. godet according to one of the preceding claims, characterized in that the peripheral region of the bearings (11, 12) and / or the peripheral region of the electric motor (13) can be felt through a plurality of channel sections (26, 27) of the channel system (10), which channel sections (26, 27) are arranged substantially axially aligned uniformly on the circumference of the carrier (4) and which channel sections (26, 27) are connected to one another.

8. godet according to one of claims 1 to 6, characterized in that the peripheral region of the bearings (11, 12) and / or the peripheral region of the electric motor (13) by a plurality of channel sections (31, 32) of the channel system (10) can be cooled which channel sections (31, 32) are arranged substantially radially aligned, evenly on the circumference of the carrier (4) and which channel sections (31, 32) are connected to each other in a helix.

9. godet according to one of claims 1 or 2, characterized in that the peripheral region of the bearings (11, 12) through the channel system (10) and the peripheral region of the electric motor (13) can be cooled by a fan (40).

10. godet according to one of claims 1 to 9, characterized in that the channel system (10) is formed by a plurality of grooves and / or a plurality of bores in the carrier.

11. godet according to one of claims 1 to 9, characterized in that the channel system (10) is formed by a coil (31).

12. godet according to one of claims 1 to 9, characterized in that the channel system (10) is formed by a combination of the features according to claim 10 and claim 11.

13. godet according to one of the preceding claims, characterized in that the channel system (10) with a pump (17) and / or with a heat exchanger (33) are arranged to a cooling medium leading closed or open cooling circuit.

14. godet according to one of the preceding claims, characterized in that the cooling medium is a water.

15. godet according to one of claims 1 to 13, characterized in that the cooling medium is an oil.

16. A godet according to claim 15, characterized in that at least one of the bearings (12) is connected to the channel system (10) by means of a line (34) such that a secondary flow of the cooling medium for cooling and

Lubrication is performed through the bearing (12).

17. godet according to claim 16, characterized in that the line has a metering device for metering the sidestream.

8. godet according to claim 16 or 17, characterized in that the bearing

(11, 12) are arranged within the bearing part (3) in an annular chamber (38) formed between the shaft / hub and the bearing part, which

Annular chamber (38) is liquid-tight towards the outside and has an outlet (39) for removing the excess cooling medium.