CN114746591B

CN114746591B - Spinning station and open-end spinning machine comprising such a spinning station

Info

Publication number: CN114746591B
Application number: CN202080082092.6A
Authority: CN
Inventors: W·拉德马赫; 汉斯-彼得·莫尔; P·威尔特; 于尔根·胡尔森
Original assignee: Zhuolang Intelligent Technology Co ltd
Current assignee: Zhuolang Intelligent Technology Co ltd
Priority date: 2019-11-29
Filing date: 2020-11-27
Publication date: 2023-09-12
Anticipated expiration: 2040-11-27
Also published as: EP3828325A1; US20220403562A1; CN114746591A; WO2021105382A1; JP2023504099A

Abstract

The invention relates to a method for detecting a yarn strength below a setpoint value of a yarn produced at a spinning station of an open-end spinning machine, in addition to a spinning station for an open-end spinning machine and an open-end spinning machine for producing a yarn from a supplied fiber sliver. In order to provide a spinning station and an air spinning machine which allow reliable detection of a yarn from an air spinning device having too low a yarn strength, it is provided for the spinning station or the spinning station of the air spinning machine that a yarn handling unit is provided in the region between the air spinning device and the winding device, which unit mechanically acts on the yarn and which exerts an adjustable yarn tension influencing force, in particular an adjustable braking force, pressure and/or clamping force, on the yarn in order to variably increase the yarn tension. For this method, it is provided that an adjustable yarn tension influence is applied to the yarn by a yarn handling unit arranged in the region between the rotor spinning device and the winding device, which yarn handling unit mechanically acts on the yarn, and that the yarn breakage and/or the yarn breakage rate, which deviation of the yarn breakage rate beyond a predetermined limit value is displayed and/or evaluated, is detected and compared with a predetermined setpoint rate.

Description

Spinning station and open-end spinning machine comprising such a spinning station

Technical Field

The invention relates to a spinning station and an open-end spinning machine for producing yarn from supplied fiber slivers, comprising at least one spinning station, an open-end spinning device for forming yarn from fiber slivers supplied by a drafting device, and a winding device for accommodating yarn on a winding bobbin.

Background

The invention also relates to a method for detecting a yarn strength below a theoretical value of a yarn produced at a spinning station of an open-end spinning machine.

Various designs of open-end spinning machines with a plurality of spinning stations arranged next to one another are known from the prior art. Air spinning machines are among the most commonly used machines for making yarns from fibrous materials, in addition to rotor spinning machines and ring spinning machines. In open-end spinning, a fiber sliver is generally drawn by means of a drawing mechanism according to the yarn count to be obtained and subsequently fed to an open-end spinning device. In an open-end spinning device, the outer fibers of the fiber sliver are wound around the inner core fibers of the fiber sliver by means of a swirling air flow generated by one or more spinning air jets and thereby form wrapped fibers which are decisive for the desired yarn count of the yarn. The yarn thus formed is finally drawn through the draw-off channel of the rotor spinning device and wound up on a bobbin, for example.

Depending on the process, it is possible, from time to time, for blockages or dirt to occur during the spinning process or for the air pressure/spinning pressure fluctuations of the air spinning device, for example the air spinning nozzle, or of the region immediately upstream thereof. The blocking or soiling here originates mainly from the fibers of the fiber sliver, which collects before the air spinning nozzle and causes the wrapping fibers to no longer wrap around the core fiber in a predetermined manner. Since the wrapping fibres are of interest for the yarn strength, this results in the yarn coming out of the air spinning device no longer having the required yarn strength. Defective yarns have so-called weaknesses, which are not reliably identifiable by known methods, such as optical methods.

Disclosure of Invention

The object of the present invention is to provide a spinning station and an open-end spinning machine that allow a yarn with too low a yarn strength to be reliably detected from an open-end spinning device. The present invention is based on the object of providing a method for detecting a yarn strength of a yarn produced at a spinning station of an open-end spinning machine below a predetermined setpoint value.

The invention accomplishes this task by a spinning station, an air spinning machine, and a method.

The spinning station according to the invention is characterized in that a yarn handling unit is arranged in the region between the rotor spinning device and the winding device, which unit mechanically acts on the yarn and applies an adjustable yarn tension influence to the yarn in order to variably increase the yarn tension.

The yarn handling unit of the spinning station according to the invention allows limiting the yarn tension of the yarn coming from the open-end spinning device to a prescribed value in a prescribed manner in the area between the open-end spinning device and the winding device. The adjustable yarn tension is here directed to the desired yarn strength of the spun yarn and may for example be selected such that yarn strength fluctuations within acceptable tolerances do not affect the spinning process. But if the yarn strength is below the maximum allowable limit value, the higher yarn tension generated by the yarn handling unit causes a yarn break, which has been estimated as an indication of a fault during the spinning process that is the cause of the reduced yarn strength.

The yarn handling unit is mechanically acting on the yarn and is designed in such a way that the yarn tension can be varied in dependence on the yarn to be spun by means of an adjustable yarn tension influence acting on the yarn. The yarn tension influencing force can be realized in a preferred manner by means of an adjustable braking force, pressure and/or clamping force.

By increasing the yarn tension by the yarn handling unit, it is thus possible to reliably identify a yarn having defects by intentional yarn breakage, whereby measures can be taken immediately at the spinning station to eliminate the cause of the defects. Thus, the production and subsequent winding of yarns having too low a yarn strength can be reliably prevented at the spinning station according to the invention, since faults can be identified and removed as early as possible.

The adjustment of the yarn tension influencing force, which increases the yarn tension by means of a yarn handling unit acting mechanically on the yarn, can in principle be carried out in any manner. According to an advantageous development of the invention, however, it is provided that the yarn handling unit has at least one adjustable clamping mechanism towards the yarn. With the clamping mechanism acting on the yarn, preferably transversely to the direction of movement of the yarn, the clamping force acting on the yarn and thus the yarn tension can be adjusted to a predetermined value in a simple and reliable manner. The clamping device can be designed in such a way that it abuts the yarn in a point-wise manner or as viewed in the yarn travel direction through a section and thus causes a sufficiently high yarn tension influence or clamping force.

In particular, the mounting of the at least one clamping means onto a section of the yarn in a face-wise manner allows the clamping force to be adjusted due to the contact length with the clamping means in such a way that there is no fear of the yarn being damaged by the engagement with the clamping means.

In addition to the advantageous provision for the use of at least one clamping device to increase the yarn tension, it is also possible to alternatively or additionally increase the yarn tension by changing the yarn course, wherein the yarn handling unit has suitable steering devices for this purpose, whereby the yarn course can be adjusted in a versatile manner. The yarn tension can thus be determined very reliably on the basis of the yarn deflection caused by the deflection mechanism, which exerts a pressure on the yarn on the basis of its position. The design of the steering mechanism is in principle freely selectable, wherein according to a particularly advantageous embodiment of the invention, the yarn handling unit has adjustable loops for varying the yarn course in a versatile manner. According to this preferred design of the invention, the yarn passes through an adjustable loop of the yarn handling unit, wherein by positioning the loop in contact with the yarn, the yarn trend is changed and pressure is applied to the yarn. The pressure then establishes a loop position opposite the position in which the yarn path is not affected by the yarn handling unit. The adjustable loop thus ensures a very reliable engagement of the yarn handling unit with the yarn. At the same time, damage to the yarn that cooperates with the loops can be reliably avoided by the design of the loops, for example the surface conditions.

In principle, the design of the at least one holding means, which is advantageously configured, can be freely selected, which in principle opens up the possibility of also providing a design for the loving yarn. According to one advantageous embodiment of the invention, the clamping mechanism is formed by a disk tensioner and/or a rake tensioner. The use of such tensioners has the advantage that they allow very precise adjustment of the clamping and thus the clamping force. For example, with the use of a disk tensioner, it is possible to apply an adjustable yarn tension to the yarn, wherein the clamping force is reliably applied to the yarn by the contact length of the disk with the yarn, and at the same time damage to the yarn is reliably avoided because of the contact length.

Furthermore, the yarn handling unit may according to a preferred embodiment have a yarn braking mechanism comprising a yarn contacting portion for contacting the moving yarn, which is designed to brake the moving yarn as prescribed by means of a braking force acting on the yarn. For example, the yarn braking mechanism may be formed by the steering mechanism. Typically, the mechanism that contacts the yarn has a surface that maintains as little impact on the moving yarn as possible. For purely versatile steering of the yarn run, the steering mechanism can according to a preferred embodiment be designed with such a surface coating contacting the yarn, so that the yarn is substantially only subjected to the pressure caused by the steering to influence the yarn tension. According to another preferred embodiment, the steering mechanism may be provided with a friction enhancing surface coating contacting the yarn, which in addition to the pressure applies a braking force to the yarn. According to an alternative preferred embodiment, the yarn braking mechanism can be designed with components associated or assignable to the spinning station, which have surface portions provided for contacting the moving yarn without diverting it.

The adjustment of the thread tension influencing force by means of the thread handling unit, for example, preferably a predetermined deflection mechanism and/or preferably a predetermined clamping mechanism acting on the thread and/or preferably a thread brake mechanism acting on the thread, can be carried out manually, wherein for this purpose a corresponding adjustment of the thread handling unit is carried out by a machine operator, for example. However, according to a particularly preferred embodiment of the invention, it is provided that the yarn tension influencing force is electrically adjustable. The electric adjustment of the yarn tension influence increases on the one hand the comfort of the adjustment of the yarn handling unit and on the other hand allows a very accurate adjustment of the yarn tension influence. For the electric adjustment of the yarn tension influence, for example, a suitable actuating motor can be used, by means of which the position of the predetermined steering or clamping or yarn braking mechanism relative to the yarn can advantageously be adjusted accurately.

The adjustment of the yarn tension can be performed, for example, by means of suitable graduations aligned on the advantageously set steering and/or clamping mechanism and/or yarn braking mechanism.

According to an advantageous embodiment of the invention, a sensor is provided for yarn tension measurement of the yarn section which can be influenced or influenced by the yarn handling unit.

The use of such a sensor, which also allows the yarn tension adjusted by the yarn handling unit to be visually displayed by means of a suitable display unit, which is connectable or connected wirelessly or by wire to the sensor, allows the yarn tension to be adjusted particularly accurately. Furthermore, the use of such a sensor in combination with an electrically adjustable, advantageously set-up of the yarn tension influence offers the possibility of automatically adjusting and controlling the yarn tension by means of a central unit by means of a suitable control and adjustment unit, without manual adjustment by the machine operator being required for this purpose. The use of such a sensor thus allows for a long maintenance of a yarn tension that remains unchanged.

The yarn handling unit can in principle be arranged at any position between the open-end spinning device and the winding device at the spinning station. According to a very advantageous embodiment of the invention, however, it is provided that the yarn handling unit is arranged in the region between the rotor spinning device and the yarn withdrawal unit connected to the rotor spinning device. The yarn take-off unit is, for example, a driven take-off roller pair, by which the yarn is taken off from the air spinning device. Since the yarn tension is generally constant in this region without the yarn handling unit, this region is particularly advantageously adapted to cause a change in yarn tension by the yarn handling unit. Furthermore, the area of the spinning station generally has a sufficiently large installation space for the simple installation of the yarn handling unit.

The invention also relates to an air spinning machine for producing yarn from a supplied fiber sliver, comprising at least one spinning station according to the invention or an improvement as described above. The open-end spinning machine generally has a plurality of spinning stations arranged next to one another, on which yarns are spun simultaneously from a supplied fiber sliver. The open-end spinning machine according to the invention has the advantage that a yarn having an excessively low yarn strength value is detected as early as possible and thus measures for eliminating any faults that may lead to a reduction in yarn strength can be initiated immediately.

According to a particularly advantageous embodiment of the invention, the rotor spinning machine has an evaluation unit for detecting the yarn breakage and/or the yarn breakage rate at the spinning station, which also performs a comparison of the yarn breakage rate with a predefinable setpoint rate. The open-end spinning machine according to the development of the invention automatically monitors the spinning stations by means of an evaluation unit and recognizes yarn breaks and/or measures the yarn break rate at the spinning stations. Thus, depending on the selectable indicator, there is the possibility of displaying it to the operator who can then conduct a cause investigation and perhaps perform measures suitable for troubleshooting. Thus, for example, a broken yarn can already be displayed by the evaluation unit and this leads to a check by the operator. Alternatively, the display may be performed on the basis of the yarn breakage rate measured by an evaluation unit, such as an information providing device of an air spinning machine, that is, when the yarn breakage rate differs from an expected value in a predetermined manner.

According to one advantageous embodiment of the invention, the rotor spinning machine further comprises a calculation unit for detecting the yarn tension by means of a yarn tension sensor provided at the spinning station and for adjusting the yarn tension influence of the yarn handling unit. The use of an adjusting unit allows for the yarn tension specific to the yarn to be adjusted in an automated manner at some spinning stations, which results in yarn breakage if the yarn strength of the spun yarn is too low. The use of an adjustment unit allows for an automated and particularly comfortable adjustment and monitoring of the spinning process of some spinning stations.

The invention also achieves this object by a method for detecting a yarn strength at a spinning station of an open-end spinning machine below a setpoint value, wherein the method according to the invention provides that an adjustable yarn tension influencing force is applied to the yarn by a yarn handling unit which is arranged in the region between the open-end spinning device and the winding device and mechanically acts on the yarn, that the yarn breakage and/or the yarn breakage rate is detected and compared with a predetermined setpoint rate, and that the yarn breakage rate deviation is displayed and/or exceeds a predetermined limit value, and/or that the yarn breakage rate deviation is evaluated in particular to initiate a measure.

The method according to the invention makes use of the fact that a fault in the spinning process of the air spinning device results in a reduced yarn strength of the spun yarn. By means of the yarn handling unit, the yarn tension can be limited to a value corresponding to the desired yarn strength. If the yarn strength is lower than expected due to a spinning process error, a yarn break occurs due to an increased yarn tension caused by the yarn handling unit, which may be estimated as an indication of a failure of the spinning process, for example because the air spinning device is contaminated.

According to the method of the invention, yarn breaks and/or yarn breakage rates at some azimuthal locations are detected. Depending on the process parameters to be adjusted, a broken yarn can already be estimated as an indication of a fault occurring during the spinning process, so that the broken yarn is displayed to the operator, who then takes appropriate measures. Additionally or alternatively, a possible malfunction of the spinning process can also be signaled to the operator only when the expected yarn breakage rate is exceeded, the operator then completing the checking or perhaps the removal of the malfunction in a similar manner.

The spinning station or the open-end spinning machine may be in particular a spinning station or an open-end spinning machine according to one of the preferred embodiments described above.

Drawings

One embodiment of the present invention is explained below with reference to the drawings, which show:

fig. 1 shows a simplified view of an air spinning machine with a plurality of spinning stations according to a preferred embodiment;

fig. 2 shows the spinning station of the rotor spinning machine of fig. 1 in normal spinning operation; and

fig. 3 shows a yarn handling unit with a clamping mechanism of the spinning station of fig. 2.

Detailed Description

Fig. 1 shows an air spinning machine 1 according to a preferred embodiment with a plurality of spinning stations 2 arranged side by side in a simplified view. Each spinning station 2 comprises a fiber sliver source 3, which can be designed, for example, as a spinning sliver, a drafting mechanism 4, an air spinning device 5, a draw-off roller pair 6a,6b, a yarn clearer 7, a yarn laying device 8, a yarn handling unit 17 and a cross-wound bobbin 9 of a winding device. The service trolley 10 is mounted movably on rails 11, 12 extending along the rotor spinning machine 1. A machine end housing 13 is provided on the longitudinal side of the rotor spinning machine 1 for receiving the central device required for the operation of the rotor spinning machine 1.

Fig. 2 shows the spinning station 2 according to a preferred embodiment in normal spinning operation. The fibre sliver 14 provided by the fibre sliver source 3 passes through a drawing mechanism 4 in which it is drawn. The drawn fiber sliver 14 is then fed to the rotor spinning device 5 via the output roller pairs 16a,16b of the drawing frame 4. In the open-end spinning device 5, the outer fibers of the fiber sliver 14 are wound onto the built-in core fibers of the fiber sliver 14 due to the air flow generated in the open-end spinning device 5, thereby forming wrapped fibers that are decisive for the desired strength of the yarn 15. The spun yarn 15 is drawn from the air-jet spinning device 5 by the draw-off roller pair 6a,6b, and wound on the cross-winding bobbin 9 of the winding device after passing through the yarn clearer 7 and the yarn distributing device 8.

In the region between the open-end spinning device 5 and the draw-off roller pair 6a,6b, the yarn 15 passes through the yarn handling unit 17, whereby a yarn tension influence is mechanically exerted on the yarn 15, which causes an increase in the yarn tension. The yarn tension which can be adjusted by the yarn tension influence is here the intended yarn strength and is dimensioned such that when the yarn strength is below the intended value a yarn break occurs due to the increased yarn tension.

One embodiment of a yarn handling unit 17 for applying yarn tension influence to the yarn 15 is shown in fig. 3. The yarn handling unit 17 has two clamping discs 23a,23b which are adjustable in relation to each other and between which the yarn 15 is guided. The clamping force acting on the yarn 15 here dominates the spring stress exerted by the threaded compression spring 21, which in turn comes from the distance between the clamping disk 23a and the stop 22 adjustable along the shaft 20, against which the opposite ends of the threaded compression spring 21 bear. The adjustment of the stop 22 and thus of the distance between the clamping disk 23a and the stop 22 is carried out here by means of an actuator motor 18 provided on the support 19 for rotating the shaft 20, which actuator motor is connected to a control and regulation unit of the rotor spinning machine, which is not shown here.

According to an embodiment not shown here, the yarn handling unit 17 has loops which are traversed by the yarn 15 and which can be adjusted in movement transversely to the direction of movement of the yarn. The deflection of the yarn path is effected by displacing the loops, wherein the yarn tension influencing force acting on the yarn in the form of pressure and in particular additional braking force, and thus the yarn tension, can be adjusted as a function of the position of the loops. The preferably provided additional braking force can be achieved according to a preferred embodiment by a corresponding surface coating of the loop surface portion of the contacting or turning yarn.

According to an embodiment, which is also not shown, for generating such a braking force a yarn braking mechanism is provided, which comprises a yarn contacting portion for contacting the moving yarn, which is designed to brake the moving yarn as prescribed by means of the braking force acting on the yarn.

List of reference numerals

1. Air spinning machine

2. Spinning station

3. Fiber sliver source

4. Drafting mechanism

5. Air spinning device

6a,6b draw-out roller pair

7. Yarn clearer

8. Yarn distributing device

9. Cross winding bobbin

10. Service trolley

11. Rail track

12. Rail track

13. Machine end housing

14. Fiber sliver

15. Yarn

16a,16b output roller pair

17. Yarn handling unit

18. Executive motor

19. Support frame

20. Shaft

21. Helical compression spring

22. Stop block

23a,23b clamping disk

Claims

1. Spinning station for an open-end spinning machine for producing yarns from supplied fiber slivers, said spinning station having

-an open-end spinning device (5), said open-end spinning device (5) being adapted to form a yarn (15) from at least one fiber sliver (14) supplied by a drawing mechanism (4), and

winding means for accommodating the yarn on a winding bobbin (9),

wherein a yarn handling unit (17) is arranged in the region between the rotor spinning device (5) and the winding device, which yarn handling unit (17) applies an adjustable yarn tension influence to the yarn (15) in order to variably increase the yarn tension, characterized in that the yarn tension influence for checking the yarn strength of the yarn (15) coming out of the rotor spinning device (5) is adjusted by means of the yarn handling unit (17) in order to increase the yarn tension to a defined value, which corresponds to the desired yarn strength of the yarn (15).

2. Spinning station according to claim 1, wherein the yarn handling unit (17) has adjustable clamping means (23 a,23 b) in a direction towards the yarn (15).

3. Spinning station according to claim 2, wherein the clamping mechanism (23 a,23 b) is constituted by a disc tensioner and/or a rake tensioner for adjustably stretching the yarn.

4. Spinning station according to claim 1, wherein the yarn handling unit (17) has an adjustable steering mechanism for variably changing the yarn orientation.

5. A spinning station according to claim 1, wherein the adjustable force is electrically adjustable.

6. Spinning station according to claim 1, characterized in that a sensor is provided for measuring the yarn tension of a yarn section influenced by the yarn handling unit (17) or that can be influenced by the yarn handling unit (17).

7. Spinning station according to claim 1, wherein the yarn handling unit (17) is arranged in the area between the air spinning device (5) and the yarn extraction unit (6 a,6 b).

8. Spinning station according to claim 1, wherein the adjustable yarn tension influencing force is an adjustable braking force, pressure and/or clamping force.

9. Spinning station according to claim 4, wherein the yarn handling unit (17) has adjustable loops for variably changing the yarn course.

10. An open-end spinning machine for producing yarn from a supplied fiber sliver, characterized in that at least one spinning station (2) according to any one of claims 1 to 9 is provided.

11. An open-end spinning machine according to claim 10, characterized in that an associated evaluation unit is provided for detecting yarn breakage and/or yarn breakage rate at the spinning station (2) and comparing the yarn breakage rate with a predefinable theoretical rate.

12. An air spinning machine according to claim 10 or 11, characterized in that an associated calculating unit is provided for sensing the yarn tension by means of a yarn tension sensor provided on the spinning station (2) and for adjusting the yarn tension influence of a yarn handling unit (17).

13. A method for detecting a yarn strength of a yarn produced at a spinning station of an open-end spinning machine below a theoretical value, wherein,

-applying an adjustable yarn tension influence on the yarn (15) by means of a yarn handling unit (17) arranged in the area between the rotor spinning device (5) and the winding device, acting mechanically on the yarn, and

-detecting and comparing the yarn breakage and/or yarn breakage rate with a predetermined theoretical ratio and displaying and/or evaluating the yarn breakage and/or yarn breakage rate deviation exceeding a predetermined limit value.