JPS5842458Y2 - Cleaning blade for smooth rotating rolls of spinning machines - Google Patents

Description

[Detailed description of the invention] The present invention is a cleaning blade for rotating rolls of a spinning machine, especially a card This invention relates to a cleaning blade for a crushing roll.

In spinning machines, for example stretchers, rotating pairs of rolls are often used between which the fibrous material is passed as a fleece, the roll pairs usually having at least one smooth roll. There is.

It is extremely important to apply such smooth roll pairs for the card crushing rolls.

In the card, the crushing rolls are used to crush impurities such as grains still contained in the fiber fleece which leaves the card during processing of the natural cotton fibres.

Experience has shown that such impurities, crushed into a fine powder, interfere with subsequent processing to a significantly lower extent than do uncrushed impurities.

Such smooth rolls (or generally smooth rolls) are prone to soiling, as they always tend to a greater or lesser extent to entrain fibers or impurities from the fiber fleece.

This tendency is particularly noticeable in crushing rolls.

This is because, due to the specific pressure per surface area required here, the pressed material, in particular the crushed grains, remains strongly adhered to the roll surface.

If these particles are not removed immediately, i.e. if the roll surfaces are not cleaned sequentially, the thin fiber fleece will be torn off during the next rotation of the crushing rolls, resulting in production problems that require machine stoppages. Trouble arises.

In short, in the spinning process, especially in the carding process, it is extremely important to effectively clean the surface of the rotating smooth roll.

Swiss Patent No. 36741 discloses that the surface of the roll is scraped by a blade knife, also called a scraper.
It is known based on the specification No. 9.

In this case, a hard, sharp edge is used in line contact with the roll along one generatrix of the roll, which edge is crimped by suitable means along the roll as regularly as possible and at a preferred set angle. .

The scraped material collects on the edges of the blade and must be removed periodically.

These known cleaning blades have various drawbacks.

For example, if hard particles such as silica sand grains, which are often included in natural fibers, are caught between the roll surface and the blade edge, the same area as the roll surface will always be rubbed, and over time As time passes, the hard particles cut grooves into the roll surface.

The roll surface is therefore severely damaged.

Yet another disadvantage is that dust that accumulates over time causes the blade to separate from the roll.

This significantly reduces the cleaning effect.

Therefore, attempts have often been made to eliminate the above-mentioned drawbacks by increasing the pressing force, but these attempts only result in a significant increase in the required drive output caused by friction, which decisively improves the cleaning effect. I wasn't able to do it.

Another disadvantage of known cleaning blades is that the scraped dust collects along or behind the edges, requiring special cleaning operations, either manual or mechanical, which are difficult to clean. In some cases, the cleaning blade must be stopped for operation.

On card crushing rolls, where the risk of wrap formation, ie the risk of the fiber fleece wrapping around the roll, is very significant, such a deactivation of the cleaning blade is itself extremely dangerous.

So-called self-cleaning cleaning blades or scrapers, such as, for example, jumping blades, are known from German Patent Application No. 1130336 and British Patent No. 872939; Even cleaning blades cannot satisfactorily meet the demand for continuous and powerful cleaning of rolls.

Known cleaning blades also have the disadvantage that they must be removed from the machine in order to sharpen the scraping edge.

In short, it is an object of the present invention to eliminate the above-mentioned drawbacks of known cleaning blades, and to provide a self-cleaning cleaning blade which, in particular, provides a constant maximum cleaning effect on rotating smooth rolls, and at the same time does not pose any risk of damage to the rolls. The objective is to minimize the efficiency, to require only a small amount of power to drive the rolls, and to operate the blades continuously, thus ensuring constant cleaning of the rolls.

The present invention, which solves the above-mentioned problems with the cleaning blade of the type described at the beginning, is such that the cleaning blade is stretched between a first and second guide roller and is driven to slide in contact with the roll surface in the longitudinal direction thereof. The point lies in the fact that it is separated from the flexible belt.

In a preferred embodiment, the flexible belt is endless.

Further, in an embodiment of the present invention, the belt is made of thin spring steel, and the belt wall thickness is 0.1 to 1. Q mm, particularly preferably from 0.3 to Q 5 mm.

Further, in the embodiment of the present invention, the belt that contacts the roll surface, when viewed in its cross section, makes an acute angle with the locus of the roll surface drawn in the roll rotation direction from the part of the relation generatrix that contacts the roll. ing.

Furthermore, the hard edge of the belt is subdivided into individual segments separated by a number of intermediate regions.

In embodiments of the invention, the flexible belt may be unwound from one roll and wound onto the other roller.

Furthermore, an advantageous embodiment of the invention provides, outside the scraping edge of the belt, a cleaning device (dresser) for the cleaning blade, which operates continuously or intermittently, and a resharpening device for the cleaning blade edge, which also operates continuously or intermittently. A heating device is provided to heat the device and the cleaning device.

Next, embodiments of the present invention will be described in detail with reference to the drawings.

1 and 2 illustrate a cleaning blade according to the invention which can be used advantageously for card crushing rolls, but is not limited to the illustrated embodiment.

It should be noted at the outset that in order to simplify the drawings, only the elements essential for understanding the present invention are shown.

In the card exit area, the first
A rotating cylinder 1 (only partially shown in Figures 1 and 2), a dossier 2 rotatably supported in a bearing 3 fixedly arranged in a card machine frame (not shown), A fleece drawer roll 4 rotatably supported in a bearing 5 fixed to the card machine frame and a pair of crushing rolls 6.7 arranged one above the other are arranged one after the other.

The lower crushing roll 6 of the pair of crushing rolls 6, 7 is rotatably supported in a stationary position within the carding machine frame, whereas the upper crushing roll 7 has a small vertical movement within the carding machine frame. It is supported by a bearing 8 so as to be able to perform the following operations.

The upper crushing roll 7 thus compresses the fiber sleeving 9, which is supported by its own weight on the lower crushing roll 6 and is guided through the roll gap between the two crushing rolls.

It is also possible for the upper crushing roll 7 to be pressed onto the lower crushing roll 6 by additional means (not shown) in order to increase this compression effect.

As is well known, the fiber fleece 9, which is separated from the docker 2 by a fleece drawer roll 4 and delivered to the crushing roll pair 6, 7, is brought together by a trumpet 10 after passing through the crushing roll pair 6, 7, and is combined with a sliver 11. Then, it is fed to the storage can 12 by a suitable feeding device (not described in detail) and stored in a coiled form.

When passing through the pair of crushing rolls 6 and 7, hard particles (such as grains and sand particles) contained in the fiber fleece 9 are crushed into fine powder, so that the fibers advancing from the pair of crushing rolls 6 and 7 The fleece will have better properties for further processing.

By the way, like virtually all the smooth rolls of the spinning machine that come into contact with the fiber fleece, such as the stretcher rolls, the crushing roll pair 6, 7 must be kept clean at all times, otherwise the crushing roll pair tend to form so-called wraps.

Such wrap formation, which is always a concern, is when the entire fiber fleece or portions of the fleece remain attached to the roll.
Therefore, it refers to the phenomenon of being carried around by the roll and being wound around the roll.

This danger, which is naturally present in the rolls of each smooth pair of rolls, is due inter alia to the adhesion between the fiber fleece and the rolls and, as the surface pressure effect occurring between the rolls of the pair of rolls becomes higher, Naturally, the risk of rack formation also increases.

The risk of this lap formation is therefore particularly pronounced on crushing rolls to which high surface pressures are applied, so that in this case it is crucial and of great importance that the surface of the crushing roll is kept perfectly clean.

In any case, in principle the problem of keeping the smooth roll pairs clean remains the same for all rolls of the spinning machine which have a smooth roll surface and are in contact with the fiber fleece, so here The solution according to the invention, which has been shown by way of example with a conventional crushing roll, can also be applied to other spinning machines.

1 and 2, only the means for cleaning the upper crushing roll 7 is shown for ease of illustration, but the lower crushing roll 6 can also be cleaned in an equivalent manner. Of course.

The cleaning blade is mainly composed of a flexible belt, and in the example shown in FIGS. 1 and 2, the belt is stretched as an endless belt 13 between a first guide roller 14 and a second guide roller 15. and, moreover, the working side belt section 16 is arranged so as to be in line contact with the roll surface along one generatrix of the roll surface to exert a scraping action.

In this case, the roll surface comes into contact with the hard sharp edges 17 (FIG. 4) of the endless belt 13.

In a preferred embodiment of the endless belt 13, this belt is a thin-walled spring steel belt, which can have a wall thickness of, for example, 0.1 to 1 mm, particularly preferably 0.3 to 9.5 mm.

However, it is also possible to use belts made of other flexible materials, such as woven belts or plastic belts, although it is essential in this case too that they have hard, sharp edges 17.

In addition, the cleaning blade, as shown in Figure 3,
It is also possible to apply a pair of crushing rolls 6, 7 which simultaneously serve as fleece drawing rolls, which is a very practical solution.

The endless belt 13 is driven by a first guide roller 14.

For this drive, the first guide roller 14 has, as can be seen in FIG. The belt is actively driven.

The first guide roller 14 as a drive roller is fixedly mounted for this purpose on a shaft 20, which shaft is mounted on a stationary support (
(not shown) and is rotatably supported within the motor 2 (not shown).
1, if necessary via a transmission (not shown).

The second guide roller 15 is designed not only as a guide roller but also as a tension roller, and for this purpose the U
The U-shaped member 22 is rotatably supported about an axis 23 in a U-shaped member 22, which is connected to the endless belt 13 by means of a tension spring 24 along a suitable guide mechanism (not shown).
is pulled in a direction that makes it tense.

Instead of the driving method of the endless belt 13 using the interlocking pin shown in FIG. 3, it is also possible to apply a driving method using the frictional movement between the first guide roller 14 and the endless belt 13, but in this case, It is necessary to take into account that some degree of slip may occur between the endless belt 13 and the first guide roller 14 depending on the circumstances.

Also, although not shown, like a typewriter ribbon,
Of course, it is also possible to use a belt arrangement/configuration in which the belt is unwound from one reel and wound onto the other reel.

However, although such an arrangement requires a more complex drive mechanism than an endless belt arrangement, it is somewhat advantageous in terms of space requirements.

According to FIG. 3, the working belt section 16 of the endless belt 13 in contact with the surface of the crushing roll 7 is guided longitudinally, ie along the relative generatrix of the roll surface, by an adjustable rigid guide element 25. be done.

Said rigid guide member 25 is shown in detail in the cross-sectional view of FIG.

This guide member 25 consists of a prismatic bar, and the bar has a guide slit 26 for the endless belt 13 in the center, and the endless belt 13 is guided slidably within this guide slit without being subjected to a tightening action. be done.

As can be seen in FIG. 4, the endless belt 13 protrudes from the guide slit and the edge 17 of the free end 27 of the belt is in contact with the rotating smooth crushing roll 7.

Due to the provision of this rigid guide member 25, the flexible endless belt 13 is guided very accurately along one generatrix of the crushing roll 7, in other words, the surface pressure is maintained with high precision. .

This is a necessary prerequisite (□) to ensure an effective cleaning action of the circulating cleaning blade.

Of course, the length of the rigid guide member 25 in this case is equal to the length of the crushing roll 7 in the main body.

In addition, FIG. 4 shows a flexible endless belt 13.
is shown contacting the crushing roll surface while elastically deforming its cross-sectional shape.

The advantages obtained by the use of elastically deformable belts, when compared with non-deformable belts in cross-section, make them overly sensitive to the guiding accuracy of the working belt section 16 (FIG. 2) along the roll surface. There is no need to be.

This is because a certain amount of tolerance is absorbed by the elastically deformed cross section of the belt.

In short, the hard edges 17 are in reliable contact over the entire length of the crushing roll.

In order to elastically deform the cross-sectional shape of the endless belt 13, the guide member 25 is adjusted so that the direction of the guide slit 26 does not match the direction of the belt portion protruding from the guide slit 26.

In short, the endless belt 13 is bent 27', the degree of bending being able to correspond to the adjustment position of the rigid guide member 25, for example, in the position shown in solid lines, the endless belt 13 is in the position shown in broken lines. 25', it is deformed more strongly (but still elastically).

Therefore, the sharp hard edge 1 of the endless belt 13
The surface pressure between the crushing roll 7 and the crushing roll 7 can be adjusted very finely in this way and adapted to the particular circumstances, for example the degree of dirtiness of the roll surface.

In addition, in FIG. 4, a flexible endless belt 13
When seen in a cross-sectional view, the locus of the roll surface drawn in the roll rotation direction from the contacting relation generatrix portion or the tangent t at the generatrix portion forms an acute angle α.

Based on experience, it has been found that arranging the endless belt 13 at an acute angle guarantees the best performance in terms of cleaning effectiveness of the cleaning blade.

The acute angle α can be adjusted within a wide range, for which the adjustability of the rigid guide element 25 applies.

However, in order to determine the setting position of the working belt section 16 of the flexible endless belt 13 against the crushing roll 7, it is necessary to
In order to determine the degree of elastic deformation and the contact angle α, it is also possible to change the plane on which the endless belt 13 is located three-dimensionally by appropriately turning the first and second guide rollers 14° and 15. It is.

FIG. 5 shows three flexible endless belts 13.
A cleaning blade is shown that guides the book over the rollers.

In this case, the two guide rollers 28 and 29 are rotatably journalled in a spatially fixedly arranged support (not shown), whereas the endless belt 13 is connected to the roll to be cleaned. Return side belt section 31 not in contact with the surface
An additional belt tensioning roll 30 is provided in the area.

The belt tensioning roller 30 is loaded by a tension spring 32.

An embodiment in which an additional belt tensioning roller 30 is provided between the guide rollers 29 and 30, as shown in FIG. 5, may be advantageous in some cases, since side spaces can be utilized more effectively.

6a and 6b show an example in which the elastic properties in the cross section of the flexible endless belt 13 can be varied as required.

For this purpose, the hard sharp edge 17 is subdivided into individual segments delimited by a number of intermediate regions 33 in FIG. 6a and by a number of intermediate regions 34 in FIG. 6b.

The intermediate section 33 in FIG. 6a is provided as a narrow slot, and the intermediate section 34 in FIG. 6b is provided as a wide cutout.

The design of these intermediate zones is related to the desired deformation characteristics of the belt cross-section.

An additional knife effect of the cleaning blade is obtained, especially when using the wide intermediate section 34 shown in FIG. 6b.

This is because not only does a continuous scraping action occur in this case, which acts parallel to the roll axis, but also the end face 35 due to the circular movement of the endless belt along the roll surface in the direction of the arrow f. A scraping effect in the lateral direction can also be obtained.

This enhanced scraping effect is advantageous if the dust is particularly sticky on the roll surface.

FIG. 7 shows a particularly advantageous seam for joining a flexible endless belt 13 made of thin-walled spring steel.

Since such a seam 36 is extremely important since its quality determines the usefulness of the circulating thin endless spring steel belt, the seam 36 is manufactured by the well-known electron beam welding in the present invention.

FIG. 8 shows a variation of the cleaning blade of the invention which allows the edges of the cleaning blade to be cleaned and resharpened during normal operation without disassembly.

For this purpose, a cleaning device (dresser), for example a dressing brush 37, which operates continuously or intermittently, is provided in the area of the return belt section outside the scraping edge of the endless belt 13, that is to say outside the edge that is in contact with the roll surface. The dressing brush removes dust adhering to the edge 17.

Furthermore, in order to remove particularly sticky dirt (e.g. produced during the processing of cotton seeds) on the roll surface or blade edge, the cleaning blade may be heated to melt and scrape the dirt. It is also possible to use an induction heating device 38, in which case it is particularly advantageous to use an induction heating device 38.

Similarly, by providing a resharpening device, such as a rotary grinding wheel 39, which operates continuously or intermittently, the hard edge 17 can be sharpened.
It is possible to constantly re-sharpen.

This resharpening device is also arranged outside the scraping edge of the endless belt 13.

The configuration shown in FIG. 8 ensures the best cleaning effect of the cleaning blade over a very long operating time.

Some decisive advantages obtained by the cleaning blade of the present invention are as follows.

(b) Hard dust and dirt are immediately shifted to the sides,
There is therefore no risk of damage to the roll, since the roll surface is not machined in the same circumferential area for a long period of time.

(b) The cleaning blade is continuously cleaned as the dirt scraped from the crushing roll is carried out to the side and then removed.

Since the blade edge can be kept clean, the cleaning blade can consistently provide the best cleaning effect.

(c) The blade edge can be resharpened without having to interrupt the cleaning action, thereby ensuring a constant leaning effect of the cleaning blade.

(d) Based on the fact that the scraping edge is always clean and sharp, the cleaning blade only needs to be pressed against the crushing roll with a relatively small pressing force, so that less power is required for the crushing roll.

(e) It is possible to easily adapt the cleaning action depending on the circumstances.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a schematic side view of the card exit area equipped with the cleaning blade of the present invention, FIG. 2 is a plan view of the card exit area shown in FIG. 1 and 2, FIG. 4 is a cross-sectional view of the cleaning blade, FIG. 5 is a plan view of the cleaning blade with rollers in a different arrangement, and FIG. 6a 7 and 6b are plan views of two different embodiments of the belt of the cleaning blade, FIG. 7 shows the seam of the endless belt for the cleaning blade, and FIG. 8 shows the dressing device, resharpening device. FIG. 2 is a plan view of a cleaning blade equipped with an apparatus and a heating device. 1...Cylinder, 2...Dotsufa, 3
... Bearing, 4 ... Fleece drawer roll, 5 ... Bearing, 6, 7 ... Crushing roll pair, 8 ... Bearing, 9...Fiber fleece, 10...Trumpet, 11...
Sliver, 12...Storage can, 13...
...Endless belt, 14...First guide roller, 15...Second guide roller, 16...
...Working side belt division, 17...Edge, 1
8... Interlocking pin, 19... Fitting hole, 2
0...Axis, 21...Motor, 22...
... U-shaped member, 23 ... shaft, 24 ...
...Tension spring, 25...Guide member, 26...
...Guide slit, 27...Belt free end, 27'...Bending portion, 28.29...
・Guide roller, 30...Belt tension roller,
31...Return side belt division, 32...
Tension spring, 33.34... intermediate section as narrow slot or wide cutout, 35... end face, 3
6... Seam, 37... Dressing brush, 38... Induction heating device, 39...
...Rotary grinding wheel.

Claims (1)

[Claims for Utility Model Registration] ■ A cleaning blade for a rotating roll of a spinning machine, which has a hard, sharp edge that scrapes the smooth roll surface in a linear manner along one generatrix of the cleaning blade. A smooth rotating roll of a spinning machine, characterized in that the rotation is controlled by a flexible belt that is stretched between a first and second guide roller and is driven to slide in the longitudinal direction in contact with the roll surface. cleaning blade for. 2. The cleaning blade according to claim 1, wherein the flexible belt is endless. 3. The cleaning blade according to claim 1, wherein the belt is made of a thin spring steel belt. 4. Belt thickness is 0.1 to 1. The cleaning blade according to claim 3 of the utility model registration claim, which is Qmm. 5. The cleaning blade according to claim 2, wherein one of the guide rollers is driven and the belt is circularly driven by friction interlocking. 6. The cleaning blade according to claim 1, wherein one of the guide rollers is configured as a belt tension roller. 7. The cleaning blade according to claim 1, wherein the belt is additionally tensioned by a belt tension roller arranged between both guide rollers. 8. A utility model in which the belt has a row of fitting holes in its longitudinal direction, and a guide roller that drives the belt is equipped with a plurality of driving pins on its outer periphery, and the driving pins engage with the fitting holes of the belt. A cleaning blade according to registered claim 2. 9. The Kooning blade according to claim 8, wherein one of the guide rollers is a driving roller equipped with a driving pin. 10. The cleaning blade according to claim 1, wherein the belt is in contact with the roll surface in the longitudinal direction of the roll surface while elastically deforming its cross-sectional shape. 11.A request for registration of a utility model in which a belt in contact with the roll surface forms an acute angle α with the locus of the roll surface drawn in the direction of roll rotation from the part of the relation generatrix that contacts the roll when viewed in its cross section. The cleaning blade according to item 1. 12. The cleaning blade according to claim 11, which is capable of adjusting the acute angle α. 13. The cleaning blade according to claim 1, wherein the belt is let out from one guide roller and wound onto the other guide roller. 14. The cleaning blade of claim 1, wherein the hard edge is subdivided into individual segments separated by a number of intermediate regions. 15. The cleaning blade according to claim 2, wherein the endless belt made of spring steel has a seam made by electron beam welding.