阅读说明：本技术 用于制造交叉卷绕筒子的纺织机的过滤装置 (Filter device for a textile machine for producing cross-wound bobbins ) 是由 L·艾丁格 于 2021-05-18 设计创作，主要内容包括：本发明涉及用于制造交叉卷绕筒子的纺织机(1)的抽吸装置的过滤装置(10),具有连接至负压源(7)的中间室(14)和被分为主过滤室(11)和备用过滤室(12)的过滤室(8),主过滤室(11)可以在气流方面与中间室(14)脱开,然后可以进行主过滤室(11)的清洁。为了一方面确保在纺织机运行时可实现该纺织机(1)的主过滤室(11)的顺利清洁并且还确保在清洁期间始终保证按照规定的纺纱负压,本发明规定,在备用过滤室(12)的区域中设有与环境空气对应的能按规定操作的进气装置(21),该进气装置根据需要允许备用过滤室(12)的过滤件(28)的清洁。(The invention relates to a filter device (10) for a suction device of a textile machine (1) for producing cross-wound bobbins, having an intermediate chamber (14) connected to a negative pressure source (7) and a filter chamber (8) divided into a main filter chamber (11) and a standby filter chamber (12), wherein the main filter chamber (11) can be decoupled from the intermediate chamber (14) with respect to the air flow and cleaning of the main filter chamber (11) can then take place. In order to ensure that, on the one hand, the main filter chamber (11) of the textile machine (1) can be cleaned smoothly during operation of the textile machine and that, at all times, a defined spinning underpressure is ensured during cleaning, the invention provides that, in the region of the auxiliary filter chamber (12), a regularly operable air inlet device (21) is provided which corresponds to the ambient air and which allows, as required, the cleaning of the filter elements (28) of the auxiliary filter chamber (12).)

1. A filter device (10) for a suction device of a textile machine (1) for producing cross-wound bobbins, the filter device (10) having an intermediate chamber (14) and a filter chamber (8), the intermediate chamber (14) being connected to a source of underpressure (7), the filter chamber (8) being divided into a main filter chamber (11) and a backup filter chamber (12), wherein the main filter chamber (11) can be separated from the intermediate chamber (14) in terms of air flow and subsequently a cleaning of the main filter chamber (11) can be carried out, characterized in that an air inlet device (21) which can be operated as required and corresponds to the ambient air is provided in the region of the backup filter chamber (12), said air inlet device allowing a cleaning of a filter element (28) of the backup filter chamber (12) as required.

2. A filter device (10) as claimed in claim 1, wherein the air inlet means (21) is designed as an air inlet slit (29) which can be covered by a closure.

3. A filtering arrangement (10) according to claim 2, wherein the air inlet slots (29) are arranged and designed such that, when the air inlet slots (29) are open, an air flow enters the filtering chamber (12) ready for use, which air flow passes by the filter elements (28) and at the same time causes the attached fibres to detach from the filter elements (28).

4. A filter device (10) according to claim 2 or 3, wherein the air inlet slot (29) is arranged in the region of the observation window (20) of the redundant filter chamber (12).

5. A filter device (10) as claimed in any one of claims 2 to 4, wherein the closure is designed as a slider (30).

6. The filter device (10) according to claim 5, characterized in that the slide (30) can be controlled in a defined manner, in particular by means of a pneumatic cylinder (31).

7. A filter device (10) according to claim 5, wherein the slide (30) is manually controllable by an operator.

8. The filtering device (10) according to claim 5 or 6, characterized in that the slider (30) is controlled by a central control unit of the open-end rotor spinning machine (1) according to the corresponding signal of the negative pressure sensor.

Technical Field

The invention relates to a filter device for a suction device of a textile machine for producing cross-wound bobbins, having an intermediate chamber connected to a source of underpressure and a filter chamber divided into a main filter chamber and a standby filter chamber, wherein the main filter chamber can be separated from the intermediate chamber in terms of gas pressure and the main filter chamber can subsequently be cleaned.

Background

Textile machines which produce cross-wound bobbins, such as open-end rotor spinning machines, generally have a large number of workstations, each of which is equipped with a pneumatic pressure consumer. Such open-end rotor spinning machines are therefore equipped with their own vacuum system, which provides the so-called spinning vacuum required at the working position for carrying out the spinning process as intended. Such a vacuum system has, for example, a vacuum source, a filter device arranged upstream of the vacuum source, and a suction channel along the machine length, wherein some pneumatic consumers, such as station open-end spinning units, are connected to the suction channel via corresponding branch lines. Furthermore, in many known open-end rotor spinning machines, a suction cross-member for the pneumatic supply of the service unit and a suction device for cleaning a dirt transport belt of a mechanical dirt removal device arranged below the spinning unit are also connected to the filter device.

DE19908378a1, for example, describes a filter device for a suction device of an open-end rotor spinning machine, the filter chamber of which is divided into a main filter chamber and a reserve filter chamber by means of various reversing shut-off valve plates. In the filter chambers, i.e. both in the main filter chamber and in the auxiliary filter chamber, filter elements are provided, which are arranged in most cases transversely to the suction air flow and which filter the air sucked in and contaminated by dirt particles and fibers. However, a problem with these known filter devices is that the filter elements are often severely blocked after a short time due to the intake of particles, which leads to a significant pressure drop in the negative pressure system of the textile machine.

However, since open-end rotor spinning machines always require a certain minimum negative pressure in order to be able to carry out a specific production process, the filter elements must be cleaned regularly.

The reversing and shut-off valve plate of the filter device can thus be adjusted in such a way that the suction air is, as required, sometimes only conducted through the spare filter chamber, so that cleaning of the main filter chamber can take place. That is, the air outlet of the main filter chamber through which all the suction air passes during normal operation is pressure-tightly closed by the shut-off mechanism, so that the cleaning door of the main filter chamber can be opened and cleaning of the main filter chamber can be performed.

However, these known filter devices have the disadvantage that the filter elements of the standby chamber are often already soiled during cleaning of the main filter chamber, so that it is almost difficult to ensure a defined underpressure.

In order to extend the cleaning interval it is also known to arrange the filter elements in the filter chamber so that the filter elements are at least sometimes self-cleaning.

A filter device with a filter chamber of this design is described, for example, in DE19836065a 1. The negative pressure system of this open-end rotor spinning machine has a filter chamber in which two filter elements are installed in an L-shaped arrangement.

The first filter element, which is arranged at a distance from the bottom of the filter chamber, is arranged here approximately perpendicular to the suction air flow and acts as a collecting screen, while the second filter element is arranged at a distance from the side wall of the filter chamber in such a way that the suction air flow coming between the suction channel connection and the connection for the vacuum source moves approximately parallel to the filter element. The filter forms a pressure relief screen.

The arrangement of the filter elements in the filter chamber results in that dirt and fibre particles which enter the filter chamber via the suction channel pipe connection and which are mainly quite fine, first settle on the collecting screen and remain fixed there, while the pressure relief screen, by which the suction air flow is first swept almost parallel, remains substantially free of dirt particles for a long time. This means that, although relatively long cleaning intervals can be achieved with such a filter device, the textile machine equipped with such a filter device must be shut down to clean the collecting screen.

Disclosure of Invention

In view of the prior art described above, the present invention is based on the object of improving a filter device of a suction device for a textile machine for producing cross-wound bobbins in such a way that, on the one hand, cleaning of a main filter chamber of the textile machine can be carried out during operation of the textile machine and that, in addition, a defined minimum spinning underpressure is always ensured during this cleaning.

According to the invention, this object is achieved in that an air inlet device which corresponds to the ambient air and can be operated as required is provided in the region of the filter chamber, which air inlet device allows cleaning of the filter elements of the filter chamber as required.

The embodiments according to the invention combine the advantages of the filtering devices known from the prior art, but do not show their disadvantages. That is, the filter device of the present invention is characterized not only by a compact structure and a long cleaning interval but also by good economical efficiency. By means of the air inlet device according to the invention it is possible, for example, in a relatively simple and reliable manner to ensure that the reserve filter chamber is always in a completely ready-to-operate state as required. That is, by operating the air inlet means accordingly, it is possible to reliably prevent the filter elements of the redundant filter chamber from being completely or partially covered with the fiber web when the redundant filter chamber is put into use. For example, if the main filter chamber is to be cleaned and the suction air flow of the suction device of the textile machine that produces cross-wound bobbins only flows through the auxiliary filter chamber for a certain time, the filter elements of the auxiliary filter chamber are first cleaned by the operation of the air inlet device, thereby ensuring that the filter elements are relatively clean at least at the beginning of cleaning of the main filter chamber and thus ensuring that the supply of underpressure to the free-end spinning unit of the textile machine is not substantially affected even during cleaning of the main filter chamber.

In an advantageous embodiment, the air inlet device is designed as an air inlet slot, which can be covered by a closure, in particular a slide. Such a design is relatively easy to implement, relatively cheap and ensures reliable operation.

The air inlet slots are preferably arranged and designed such that, when the air inlet slots are open, an air flow enters the filter chamber from the outside, flows past the filter screen and detaches the adhering fibres from the filter elements. The opening of the air inlet device and thus the detachment of the fibres from the filter elements and their subsequent transfer into the main filtering chamber advantageously takes place immediately before the switching of the suction air flow. That is, the air intake apparatus of the present invention is operated and thus the filter screen of the backup filter chamber is cleaned before the main filter chamber is temporarily switched to no negative pressure to allow cleaning and the entire suction air flow is directed through the backup filter chamber.

In an advantageous embodiment, the air inlet slot can be covered in the area of the observation window of the redundant filter chamber by means of a slide which can be controlled as required. The slide can in turn be operated, for example, by means of a pneumatic cylinder. The observation window of the filtering chamber is arranged in the area of the filter elements of the filtering chamber, so that the air inlet device can be realized in a simple manner by the arrangement of the air inlet slots covered by the sliding elements during normal spinning operation, which allows an effective cleaning of the filter elements of the filtering chamber.

The control of the slide can be carried out manually by the operator or can be carried out as a function of the corresponding signal of the negative pressure sensor, for example by a central control unit of the open-end rotor spinning machine. That is, the control of the slide and thus the opening of the air intake slit is automated, depending on, for example, sensor means measuring the negative pressure conditions in the suction channel.

Another advantageous embodiment consists in that a corresponding sensor device is provided on the cleaning door of the main filtering chamber. This means that, as soon as someone tries to open the cleaning door of the main filtering chamber, the slide is triggered so that it opens the inlet slot. The suction air flow entering through the inlet slot then cleans the filter elements of the redundant filter chamber before the operation of the two filter chambers is alternated.

Drawings

The invention will be described in detail below with reference to an embodiment shown in the drawings, in which:

figure 1 shows in perspective an end part of an open-end rotor spinning machine with a filter device designed according to the invention and arranged in an end frame,

figure 2 shows in a partial cross-sectional side view a filter device according to the invention arranged in an end frame,

figure 3 shows an air inlet device arranged in the area of the observation window of the spare filter chamber of the filter device and formed by an air inlet slot and a slide, wherein the air inlet slot is covered by the slide, and

fig. 4 shows the air inlet device shown in fig. 3, wherein the slider is rotated to open the air inlet slits.

Reference numerals

1 open-end rotor spinning machine

2 end frame

3 working position

4 spinning can

5 free end spinning unit

6 winding device

7 negative pressure source

8 filtering chamber

9 suction channel

10 Filter device

11 main filtering chamber

12 standby filtering chamber

13 exhaust gas channel

14 middle chamber

15 air vent

16 partition wall

17 air vent

18 partition wall

19 clean door

20 observation window

21 air inlet device

22-off mechanism

23 shut-off component

24 shutoff valve plate

25 filter element

26 suction air flow

27 air inlet

28 filter element

29 air inlet seam

30 sliding part

31 pneumatic cylinder

32 point of rotation

33 solenoid valve

34 source of compressed air

I first terminal position

II second terminal position

R direction

Detailed Description

Fig. 1 shows the end of an open-end rotor spinning machine 1. Such open-end rotor spinning machines 1 are generally provided with two parallel rows of stations located between two end frames 2 and each having a large number of stations 3 side by side. As is known, at the station 3, the fiber sliver stored in the spinning can 4 is spun into a yarn by means of an open-end spinning unit 5, and the yarn is subsequently wound on a winding device 6 of the station itself to form a large package of cross-wound bobbins (not shown). The open-end spinning unit 5 of such an open-end rotor spinning machine 1 requires a specific so-called spinning negative pressure in order to comply with a predetermined spinning process. The spinning underpressure is provided by the underpressure system of the textile machine itself, which has a filter device 10, which in particular has an underpressure source 7, a filter chamber 8 and a suction channel 9 along the length of the machine, wherein in the region of the stations 3 a plurality of dedicated pneumatic lines branch off from the suction channel 9, to which the negative-pressure-tolerant rotor housings of the open-end spinning units 5 are connected.

In addition, in the region of the end frame 2, the suction duct of the dirt removal device of the machine itself is usually connected to the suction channel 9 or directly to the filter chamber 8, which is not shown in the figures for a better overview. The dirt removal device is usually formed by a dirt conveyor belt along the machine length, which is arranged below the fiber sliver opening device of the open-end spinning unit 5 and is removed by the air flow in the region of the end frame 2 by means of a suction device.

As will be explained in detail below in connection with fig. 2, the filtering chamber 8 of the filtering apparatus 10 is divided into a main filtering chamber 11 and a reserve filtering chamber 12, wherein the main filtering chamber 11 can be temporarily disconnected from the underpressure system of the open-end rotor spinning machine 1 as required.

As shown in fig. 1, the main filtering chamber 11 has a cleaning door 19 that can be closed in a pressure-tight manner during normal spinning operation, which can be removed for cleaning of the main filtering chamber 11. In the area of the redundant filter chamber 12, a viewing window 20 is provided, which allows a view of the filter elements 28 of the redundant filter chamber 12. The observation window 20 is also equipped with an air inlet device 21 designed according to the invention.

Fig. 2 shows an exemplary embodiment of a filter device 10, which is arranged in an end frame 2 of a textile machine for producing cross-wound bobbins, for example an open-end rotor spinning machine 1, in a partially sectional side view. As can be seen and has been explained above, the filter device 10 has in particular a filter chamber 8 which is divided into two filter chambers, namely a main filter chamber 11 and a redundant filter chamber 12. The filter device 10 is connected via a suction channel 9 to the pneumatic consumers of the open-end rotor spinning machine 1, which are not shown in fig. 2, and can be connected, for example, via an exhaust channel 13 to the spinning mill's own suction device. Typically, the filter device 10 has its own filter chamber 8 for each of the two rows of stations of the open-end rotor spinning machine 1. I.e. two identical filter chambers 8 are provided side by side in the end frame 2.

The filter chambers 8 are connected to intermediate chambers 14, respectively, to which the vacuum source 7 is connected. As already explained above, the filtering chamber 8 is divided into a main filtering chamber 11 and a redundant filtering chamber 12, respectively, wherein the main filtering chamber 12 is connected to the intermediate chamber 14 through ventilation holes 15 arranged in the partition wall 16. The spare filtering chamber 12 is connected to the intermediate chamber 14 via the ventilation holes 17 in the partition wall 18.

In the region of the venting opening 17, a shut-off mechanism 22 is installed, which can be controlled in opposition to a compact shut-off element 23 provided in the region of the venting opening 15. That is, when the shut-off member 23 is in the second terminal position II, the clear cross-section of the ventilation aperture 15 is almost completely exposed, and the shut-off mechanism 22 keeps the ventilation aperture 17 of the redundant filter chamber 12 closed. Accordingly, the vent 17 is open when the shut-off member 23 is in the first end position I, in which the associated vent 15 is closed.

On the inlet side of the main filtering chamber 11 there is also an air inlet 27, which can be closed by means of a shut-off valve plate 24. The shutoff valve plate 24 is opened or closed in synchronization with the shutoff component 23.

In the exemplary embodiment shown in fig. 2, the shut-off part 23 has a rotatably mounted bearing shaft, which is preferably rotatable by means of an electric mechanism, on which bearing shaft the bearing sleeve is guided in an axially adjustable but non-rotatable manner. The closing element of the shut-off member 23 is fixed on the bearing sleeve, which can be positioned in the second end position II or the first end position I by controlling the electric mechanism accordingly, wherein the gas vent 15 is ensured to be closed in a pressure-tight manner in the first end position I.

It can be seen that the main filtering chamber 11 is provided with filtering elements 25 and is accessible through a removable cleaning door 19. Preferably, a pressure relief device, not shown, is also provided in the region of the cleaning door 19, whereby the main filter chamber 11 is automatically connected to normal air pressure when the corresponding handle is operated, so that the cleaning door 19 can be removed smoothly after it has been unlocked and the filter elements 25 can be cleaned.

The redundant filter chamber 12 is provided with a filter element 28 and a viewing window 20. An air intake device 21 designed according to the invention is installed in the region of the observation window 20. That is, an air inlet slot 29 is machined into the viewing window 20, which is covered during conventional spinning by means of, for example, a pivotally mounted slide 30. The slide 30 can be positioned here, for example, by means of a pneumatic cylinder 31, in such a way that the inlet slot 29 is either closed or open. When the air inlet slot 29 is open, an air flow can flow from the outside into the redundant filter chamber 12, which cleans the filter elements 28 of the redundant filter chamber 12 sweeping by the filter elements 28. Figures 3 and 4 show in enlarged scale an air inlet means 21 according to the invention arranged in the area of the observation window 20 of the redundant filter chamber 12. As shown, the air inlet slot 29 is machined into the observation window 20 of the reserve filter chamber 12, which is covered during normal spinning operation by a pivotably mounted slide 30, as shown in fig. 3, and is thus closed. An actuating mechanism, such as a pneumatic cylinder 31, is connected to a slide 30 which is pivotally mounted about a pivot point 32. The pneumatic cylinders 31 can be controlled by means of solenoid valves as required by a central control unit of the open-end rotor spinning machine 1. That is, the pneumatic cylinder 31 has, for example, a compression spring which ensures that during normal spinning operation the slide 30 is positioned in the position shown in fig. 3, in which the inlet slot 29 is covered and therefore the inlet device 21 is not operated.

If the air inlet means 21 is to be activated to clean the filter elements 28 of the redundant filter chamber 12, the solenoid valve 33 is switched on so that the pneumatic cylinder 31 is connected to the compressed air source 34 and is subjected to pressure, so that the pneumatic cylinder 31 retracts and simultaneously pivots the slide 30 in the direction R as shown in fig. 4. In this slide position, the air inlet slot 29 is open, so that an air flow enters the filter chamber 12 from the outside, flows past the filter elements 28 of the filter chamber 12 and simultaneously cleans them, i.e. removes adhering fibre fluff.

Function of the cleaning device according to the invention：

During "normal" spinning operation, the rotating fan of the negative pressure source 7 ensures that a negative pressure occurs in the inlet region of the filter chamber 8, in particular in the region of the suction channel 9 along the machine length, which is connected to the pneumatic pressure consuming device of the open-end rotor spinning machine 1, such as the open-end spinning unit 5.

Since the ventilation opening 17 in the partition wall 18 of the backup filter chamber 12 is closed, but the shutoff valve plate 24 and the ventilation opening 15 in the partition wall 16 are open, the suction air flow 26 generated by the negative pressure is moved here through the intermediate chamber 14 to the negative pressure source 7. The primary filter chamber 11 opens to the negative pressure source 7 via the intermediate chamber 14. The suction air flow 26 now flows through the filter elements 25 of the primary filter chamber 11 and is cleaned there. After a certain operating time, as the filter element 25 becomes increasingly dirty, a loss of underpressure occurs, which can be detected, for example, by a sensor device installed in the region of the suction channel 9. The negative pressure loss is displayed, for example, optically and/or acoustically, and is thus informed of the need to clean the main filter chamber 11, in particular the filter elements 25 thereof.

In this case, the responsible operator, who is warned by means of an optical and/or acoustic signal, or the central control device of the open-end rotor spinning machine 1, which is informed accordingly, ensures that the switching from the main filtration chamber 11 to the standby filtration chamber 12 and the main filtration chamber is left idle in terms of working gas cleaning. That is, the ventilation hole 15 of the main filtering chamber 11 is closed by the shut-off member 23, the air inlet 27 of the main filtering chamber 11 is closed by the shut-off valve plate 24, and at the same time, the shut-off mechanism 22 is pivoted into the area of the ventilation hole 17 of the redundant filtering chamber 12 in such a way that the suction air flow 26 flows through the filter element 28 of the redundant filtering chamber 12.

However, in order to prevent the filtering elements 28 of the redundant filtering chamber 12 from becoming dirty when they are put into use, it is necessary to take into account that the filtering elements 28 of the redundant filtering chamber 12 are cleaned before the switching of the suction air flow 26 from the main filtering chamber 11 to the redundant filtering chamber 12. For this purpose, the inventive air inlet device 21 is used, which is installed in the region of the observation window 20 of the redundant filter chamber 12. That is, the solenoid valve 33 between the compressed air source 34 and the pneumatic cylinder 31 is energized such that the pneumatic cylinder 31 causes the slider 30 to pivot from the closed position shown in fig. 3 to the working position shown in fig. 4. That is, the pivotally mounted slide 30 is pivoted towards R from the position where it was in during normal spinning operation and the air intake slot 29 machined into the observation window 20 of the reserve filter chamber 12 is closed, while shifting into the position where the air intake slot 29 is now open. Thus, the air flow can enter the filtering chamber 12 from the outside through the open air inlet slot 29, and pass by the filtering elements 28 of the filtering chamber 12, so that cleaning of the filtering elements 28 takes place.