EP2163685A1 - Doctor blade system - Google Patents

Abstract

The system (10) has a blade holder (12), and a scraper blade (14) inserted in the blade holder. A changing device automatically or semi-automatically changes the scraper blade attached to the blade holder. A pulling, inserting and/or positioning unit (18) pulls the scraper blade from the blade holder, inserts the scraper blade in the blade holder and/or positions the scraper blade in the blade holder. The changing device comprises a traction power element (20) e.g. chain, that forms a slotted link for pulling, inserting and/or positioning the scraper blade in the blade holder.

Description

The invention relates to a scraper system with a blade holder and an insertable into the blade holder scraper blade.

Such scraper systems or devices are e.g. used in the paper industry. There they serve, in particular, for cleaning roll surfaces and / or removing the fibrous web, in particular paper, board or tissue web, from a roll or a cylinder, in particular a drying cylinder of the dryer section.

The scraper blade generally extends over the entire width of the roll, wherein it rests against the relevant roller or cylinder during operation and in this case forms a specific angle with its or its lateral surface with a direction of rotation of the roller or cylinder jacket opposing component.

The maximum paper machine width has increased from 9 m to 10.9 m (wire width), with a screen width of 11.8 m being provided for the recently conceived paper machines. With the increasing machine width, the problems associated with the cleaning of drying cylinders associated scraper blades have grown problems, which is due to various reasons.

Thus, the force required to pull out a scraper blade when paper stock has been pinched is often very high. In some cases up to six persons are required.

In addition, the blade holder and the gap between the drying cylinder and the doctor blade is partially cleaned by means of a 12 m long blowpipe, which must be manually inserted into the paper machine. This brings a considerable security effort with it, which is obvious, after handling a blowpipe of appropriate length under limited space is not easy. In addition, the cleaning of a pre-dryer section with, for example, fifty drying cylinders is extremely time-consuming.

Finally, problems arise especially when the doctor blade is to be used in the still blocked with dirt and / or scraps of paper blade holder. This often entails that the doctor blade must be repeatedly pulled out of the blade holder and reinserted into it, which again involves a corresponding expenditure of time and affects the temporal efficiency of the relevant paper machine as a whole.

The invention has for its object to provide an improved scraper system of the type mentioned, with which the aforementioned disadvantages are eliminated. In particular, it should be achieved that a respective change of the doctor blade is possible as quickly and efficiently as possible.

This object is achieved in that the blade holder is associated with a device for automatic or semi-automatic doctor blade change.

The changing device preferably comprises means for extracting a respective doctor blade from the blade holder and / or means for drawing a respective doctor blade into the blade holder.

The blade holder can be made in two parts or in one piece. Furthermore, the blade holder may include a blade holding device in which the blade can be received and fixed, and a scraper body. The scraper body is flexurally rigid to prevent deflection of the blade across the width of the paper machine.

It is particularly advantageous if the changing device comprises means for positioning a respective doctor blade in the blade holder.

According to a preferred practical embodiment of the scraper system according to the invention, the changing device comprises in particular for pulling out or pulling in and / or positioning a respective scraper blade at least one forming a loop traction element, in particular chain, rope, belt, and / or the like, with associated drive.

In certain cases, it is also expedient if the changing device comprises means for fixing a respective doctor blade in the blade holder. In this case, one and the same loop-type traction element can be provided for several or all of the said functions. The extraction means in question, means for drawing in and / or means for positioning can thus comprise a common loop-type traction element.

In particular, it is also advantageous if the changing device comprises means for fixing a respective doctor blade in the blade holder.

Preferably, the means for pulling out, the means for pulling, the means for positioning and / or the means for fixing a respective doctor blade, a control and / or regulating device associated with the control and / or regulation of the respective pull-out, retraction, positioning or Fixing the respective doctor blade is executed.

According to a preferred embodiment of the scraper system according to the invention, a supply roll with continuous doctor blade material is provided, from which the blade holder the material required for the respective doctor blade can be supplied via the drawing-in means.

Appropriately, means may be provided for the particular automatic cutting of the withdrawn from the supply roll and inserted into the blade holder doctor blade material to the correct length, said means are preferably again controlled by a control and / or regulating device.

Preferably, a control and / or regulating device is provided, which are so controlled or by the respective means are controlled so that at least the supply of originating from the supply roll doctor blade material to the blade holder and retracting this doctor blade material in the blade holder on the retraction means and the Cutting the doctor blade material over the cutting means done automatically.

In this case, the fixing means may additionally be actuated via the control and / or regulating device, it being possible for the control and / or regulating device to be designed for such a control of the respective means that the doctor blade material retracted in the blade holder is fixed before it reaches the correct position Length is cut.

It is thus possible an automatic doctor blade change.

However, in particular for a semi-automatic doctor blade change, it may also be advantageously provided that the positioning means and / or preferably the fixing means are controlled by a control and / or regulating device which is designed such that a doctor blade previously inserted with the correct length into the blade holder is automatically positioned in the blade holder via the positioning means and is then preferably automatically fixed via the fixing means. The insertion of the scraper blade in the blade holder can be done here, for example, still manually. By contrast, the subsequent steps are again automated.

The means for pulling out, the means for pulling in, the means for positioning and / or the means for fixing the doctor blade and / or the means for squeezing the doctor blade can be driven at least partially by a common control and / or regulating device.

Another preferred embodiment of the scraper system according to the invention is characterized in that a supply roll with continuous doctor blade material is provided, from which the blade holder the material required for the respective doctor blade can be fed, wherein the doctor blade material on the drawing and / or drawing means as needed continuously, ie without being disconnected, on the one hand from the supply roll off and fed into the blade holder and on the other hand is pulled out of the blade holder. In this case too, a correspondingly designed control and / or regulating device can again be provided, in particular for the corresponding activation of the retraction and / or extraction means.

It is also particularly advantageous if means are provided for, in particular, automatic cleaning of the blade holder and / or means for, in particular, automatic cleaning of the doctor blade.

It is of particular advantage here if the means for automatically cleaning the doctor blade comprise means for automatically extracting the doctor blade from the blade holder and at the same time stripping off sticking stickies and / or the like on the doctor blade, a collecting container preferably being provided for receiving the stripped stickies and preferably means are provided to automatically retract the doctor blade after the cleaning process in the blade holder. Also in this case, a correspondingly executed control and / or regulating device can again be provided for controlling the respective means.

As already mentioned, one and the same control and / or regulating device can also be provided for a plurality, preferably all, of the means mentioned.

The blade holder can thus be provided, for example, with a chain or rope loop, via which the doctor blade can be pulled into the machine or pulled out of it again. Different designs are conceivable.

For example, for automatic insertion of the doctor blade into the blade holder and automatic anchoring of the blade in the holder, doctor blade material can be withdrawn from a supply roll providing continuous blade material and retracted into the blade holder, preferably also cutting the doctor blade material to the correct length to fit the respective blade To form scraper blade. Conveniently, the doctor blade material provided on the supply roll has a length that is greater than three times the length of a respective doctor blade length. After a respective scraper blade has been pulled out of the blade holder, it can be cut or rolled up for removal from the machine.

In addition, for example, a semi-automatic variant is conceivable in which a previously used with the correct length in the blade holder scraper blade on the positioning automatically positioned in the blade holder and is preferably fixed automatically via the fixing subsequently. In this case, therefore, the doctor blade can be previously used for example manually in the blade holder. The respective operator can therefore use the already tailored to the correct length corresponding to the machine width scraper blade in the blade holder, whereupon expediently position the automatic blade positioning the doctor blade in the machine and fix the automatic fixing the blade in the holder. For a respective change the scraper blade is then automatically pulled out of the blade holder by the changing device or the extraction means. Subsequently, the scraper blade, for example, manually removed from the changer and taken away in the usual way.

In addition, the doctor blade changer may include a cleaning mechanism to remove scraps of paper from the blade holder. Alternatively or additionally, means for cleaning the doctor blade can be provided. In this case, the cleaning device in question may for example be operated by compressed air, have at least one brush, be provided with at least one hook-like element and / or the like.

The aforementioned fully automatic embodiment can be realized in particular where drying cylinders or other scraper-equipped cylinders or rollers are at least substantially directly driven. In these cases, the doctor blade changing device can be installed in particular on the drive side of the paper machine.

In the case of the mentioned semi-automatic embodiment, the doctor blade changing device can be provided on both the drive and the leader side of the machine.

In particular, with the fully automatic blade change results in a considerable time savings, whereby the efficiency of the paper machine is significantly increased overall.

The insertion of the doctor blade into the blade holder and the extraction of the doctor blade from the blade holder are each preferably transversely to the machine direction or parallel to the longitudinal direction of the blade holder.

A comparable with the aforementioned automatic variant further variant of the scraper system or the Schaberklingenwechseleinrichtung differs from the first mainly in that the Scraper blade continuously, for example, together with the change mechanism or the loop-like tension element, is transported in the cross machine direction.

In addition to the advantages of automation, the last-mentioned variant of continuous transport in the cross machine direction brings a number of further advantages. This results in a very uniform wear, since each part of the doctor blade comes into contact with each point of the drying cylinder. In addition, the continuous transport continuously removes dirt from the scraper. Finally, the doctor blade for a particular change no longer needs to be raised, which eliminates a previously existing high security risk.

Fig. 1

eine schematische Stirnansicht einer beispielhaften Ausführungsform eines Schabersystems insbesondere für einen automatischen Schaberklingenwechsel,

Fig. 2

eine schematische Seitenansicht des Schabersystems gemäß Fig. 1,

Fig. 3

eine schematische Teildarstellung einer weiteren bei-spielhaften Ausführungsform des Schabersystems ins-besondere für einen halbautomatischen Schaberklin-genwechsel,

Fig. 4

eine schematische Darstellung einer weiteren beispiel-haften Ausführungsform des Schabersystems, bei dem je nach Bedarf kontinuierlich Schaberklingenmaterial zugeführt wird, und

Fig. 5

eine schematische Darstellung einer weiteren beispiel-haften Ausführungsform des Schabersystems mit Mit-teln zur automatischen Reinigung der Schaberklinge.

Further features and advantages of the invention will become apparent from the drawing; in this show:

Fig. 1

a schematic end view of an exemplary embodiment of a scraper system, in particular for an automatic doctor blade change,

Fig. 2

a schematic side view of the scraper system according to Fig. 1 .

Fig. 3

a schematic partial view of another exemplary embodiment of the scraper system in particular for a semi-automatic doctor blade change,

Fig. 4

a schematic representation of another exemplary embodiment of the scraper system, in which continuously scraper blade material is supplied as needed, and

Fig. 5

a schematic representation of another exemplary embodiment of the scraper system with means for automatic cleaning of the doctor blade.

The Fig. 1 and 2 show in a schematic end view and a schematic side view of an exemplary embodiment of a scraper system 10, in particular for an automatic doctor blade change.

The scraper system 10 comprises a blade holder 12 and a scraper blade 14 which can be inserted therein. The blade holder 12 is assigned a device 16 for a doctor blade change. In the present case, this changing device 16 is designed, for example, for a completely automatic doctor blade change.

The changer 16 includes means 18 for withdrawing a respective scraper blade 14 from the blade holder 12 and for inserting a respective scraper blade 14 into the blade holder 12. These means 18 may be provided simultaneously for positioning the scraper blade 14 in the blade holder 12 at the same time.

In the present case, these means 18 for pulling out and optionally for positioning comprise at least one loop-forming traction element 20 with associated drive 22. The loop-like traction element 20 may in particular comprise a chain, rope, belt, and / or the like.

The loop-like tensile force element 20 is guided around a plurality of guide rollers 24 and a driving roller 22 provided as a drive. In this case, the loop-like tensile force element 20 is guided in the lower area by an opening 26 provided in the blade holder 12. The guide rollers 24 and the drive roller 22 are outside of the blade holder 12. Also with a respective scraper blade 14 engaging in the upper portion of the loop-like tensile force element 20 is outside, here for example above the blade holder 12th

The changing device 16 may in particular also comprise means for fixing a respective scraper blade 14 in the blade holder 12.

In particular, a supply roll 28 (cf. Fig. 4 ) may be provided with continuous doctor blade material, from which the blade holder 12, the material required for the respective doctor blade 14 via the extraction, retraction and / or positioning means 18 can be fed.

In particular, means may also be provided for the particular automatic cutting of the drawn off from the supply roll 28 and inserted into the blade holder 12 doctor blade material to the correct length.

At least one control and / or regulating device may be provided for controlling the pull-in, pull-out and / or positioning means 18 or the drive 22 and optionally also for controlling the trimming means, wherein the respective means preferably have a common control and / or regulating device assigned. This at least one control and / or regulating device can in particular for an automatic doctor blade change to the appropriate control and / or regulating the means 18 for taking off, drawing in, positioning and / or fixing the respective doctor blade and / or the cutting means. In this case, this control and / or regulating device can in particular be connected and configured with this means in such a way that a fully automatic doctor blade change results.

The control and / or regulating device can thus be designed in particular for such a control of the respective means that at least the supply of the scraper blade material from the supply roll 28 to the blade holder 12 and the insertion of this scraper blade material in the blade holder 12 via the Einziehmittel 18 and the cutting the doctor blade material over the trimming means automatically takes place.

Moreover, the control and / or regulating device can also be provided for the actuation of fixing means and designed for such a control of the respective means that the retracted into the blade holder 12 doctor blade material is fixed before it is cut to the correct length.

While with in the Fig. 1 and 2 reproduced embodiment, in particular a fully automatic doctor blade change takes place, shows the Fig. 3 an exemplary partial view of an exemplary embodiment of the scraper system 10 for a semi-automatic doctor blade change.

In this case, the preferably at least one loop-type traction element 20 comprising means 18 preferably serve only the positioning and corresponding means preferably also the fixation of a previously used with the correct length in the blade holder 12 Scraper blade 14. An automatic operation takes place here so only after the insertion of the scraper blade 14 in the blade holder 12, which can be done manually. The positioning means 18 and preferably also the fixing means can again be controlled by a control and / or regulating device.

In the present case, the positioning means 18 and possibly also the fixing means can be controlled by the control and / or regulating device in particular so that a previously used with the correct length in the blade holder 12 scraper blade 14 via the positioning means 18 automatically positioned in the blade holder 12 and preferably subsequently fixed automatically via the fixing agent. The control and / or regulating device is thus designed accordingly for such a semi-automatic doctor blade change.

Incidentally, this embodiment may be at least substantially the same as the embodiment according to FIGS Fig. 1 and 2 , Corresponding parts are assigned the same reference numerals.

Fig. 4 shows a schematic representation of another exemplary embodiment of the scraper system 10, in which, as required, scraper material is supplied continuously.

In the present case, a supply roll 28 having a continuous doctor blade material is initially again provided, from which the blade holder 12 can be supplied with the material required for the respective doctor blade 14. In the present case, however, the doctor blade material 30 via Einzieh- and Ausziehmittel 18 as needed continuously, ie without being separated, on the one hand from the supply roll 28 off and in the Blade holder 12 retracted and on the other hand pulled out of the blade holder 12.

In particular, the pull-in and pull-out means 18 can again be designed as the previously described means 18, i. in particular, again comprise a traction element 20 forming a loop. In this case too, the pull-in and pull-out means 18 can again be actuated via a control and / or regulating device. In this case, this control and / or regulating device can in particular again be designed so that, for example, at predetermined time intervals results in an automatic doctor blade change.

As based on the Fig. 4 can be seen, the scraper blade material pulled out of the blade holder 12, for example, via a guide channel 32 are discharged into the basement 44.

Fig. 5 shows a schematic representation of another exemplary embodiment of the scraper system 10 with means 34 for automatically cleaning the doctor blade 14th

In the present case, the scraper system 10 for automatic cleaning of the scraper blade 14 comprises means 34 for automatically extracting the scraper blade 14 from the blade holder 12 while at the same time stripping off adhering stickies and / or the like on the scraper blade 14. In this case, the doctor blade 14 can be rolled up when pulling out of the blade holder 12 to a roller 36, for which purpose a corresponding drive 37 is provided. As is clear from the Fig. 5 results, the roller 36 can be formed, for example, on a table 38 or the like.

The means 34 for cleaning the doctor blade 14 may also include, for example, at least one brush 40, a blade 42 and / or the like, which may be provided for example on the table 38.

For receiving the stripped stickies, for example, a collecting container may be provided. Means are also preferably provided to automatically re-insert the scraper blade 14 into the blade holder 12 following the cleaning process. For this purpose, for example, again the previously described, for example, a loop-like tensile force element 20 comprehensive input and / or extraction means 18 may be provided.

The roller 36 may at the same time be the supply roll 28 provided in the respective embodiments described above.

With the extraction of the doctor blades 14 from the blade holder 14 so sticking stickies are simultaneously in the present case adhering to the doctor blade 14. These can then be easily collected in a container.

In the present case, in particular, the drive 36 associated with the drive 37 can be controlled by a control and / or regulating device. In this case, this control and / or regulating device can in particular be designed so that this cleaning process again takes place automatically.

With this integrated cleaning device, the accident risk that has previously been given when Schaberklingenziehen further reduced. moreover This results in a further time saving. Soiling of the machine floor can be prevented.

With this integrated cleaning device, therefore, the scraper blade 14 can be automatically pulled out of the blade holder 12, with sticking sticks etc. sticking to the scraper blade 14 being scraped off at the same time, and the scraper blade 14 subsequently being pushed back into the blade holder 12.

LIST OF REFERENCE NUMBERS

10

scraper system

12

blade holder

14

scraper blade

16

changer

18

20 means for pulling out, pulling in and / or positioning the doctor blade loop-like traction element

22

Drive, drive roller

24

guide roll

26

opening

28

supply roll

30

Scraper blade material

32

guide channel

34

cleaning supplies

36

role

37

drive

38

table

40

brush

42

blade

44

basement, cellar

Claims (15)

Scraper system (10) having a blade holder (12) and a scraper blade (14) which can be inserted into the blade holder (12),
characterized in that associated with the blade holder (12) is means (16) for automatic or semi-automatic doctor blade change. Scraper system according to claim 1,
characterized in that the changer (16) comprises means (18) for withdrawing a respective scraper blade (14) from the blade holder (12) and / or means (18) for drawing a respective scraper blade (14) into the blade holder (12). Scraper system according to claim 1 or 2,
characterized in that the changer (16) comprises means (18) for positioning a respective scraper blade (14) in the blade holder (12). Scraper system according to one of the preceding claims,
characterized in that the changing device (16) in particular for pulling out or pulling in and / or for positioning a respective scraper blade (14) at least one forming a loop traction element (20), in particular chain, rope, belt, belt and / or the like, with associated drive (22). Scraper system according to one of the preceding claims,
characterized in that the changer (16) comprises means for fixing a respective scraper blade (14) in the blade holder (12). Scraper system according to one of the preceding claims,
characterized in that the control means (18) for pulling out, the means (18) for pulling in, the means (18) for positioning and / or the means for fixing a respective scraper blade (14) is assigned a control and / or regulating device, which is designed for controlling and / or regulating the respective pull-out movement, pulling-in movement, positioning or fixing of the respective doctor blade (14). Scraper system according to one of the preceding claims,
characterized in that a supply roll (28) is provided with a continuous doctor blade material from which the blade holder (12) for each scraper blade (14) required material via the retraction means (18) can be fed. Scraper system according to claim 7,
characterized in that means for in particular automatically cutting the withdrawn from the supply roll (28) and in the blade holder (12) inserted doctor blade material provided to the correct length are, these means are preferably controlled by a control and / or regulating device. Scraper system according to one of the preceding claims,
characterized in that a control and / or regulating device is provided, which is carried out or by which the respective means are controlled so that at least the supply of the supply roll (28) originating doctor blade material to the blade holder (12) and the retraction this doctor blade material in the blade holder (12) via the Einziehmittel (18) and the cutting of the doctor blade material on the cutting done automatically. Scraper system according to claim 9,
characterized in that via the control and / or regulating device additionally the fixing means are controlled and the control and / or regulating device is designed for such control of the respective means that in the blade holder (12) retracted scraper blade material is fixed before it is cut to the correct length. Scraper system according to one of claims 1 to 8,
characterized in that the positioning means (18) and preferably the fixing means are controlled by a control and / or regulating device which is designed so that a previously already with the correct length in the blade holder (12) scraper blade (14) on the Positioning means (18) automatically positioned in the blade holder (12) and preferably subsequently fixed automatically via the fixing agent. Scraper system according to one of the preceding claims,
characterized in that the means (18) for withdrawing, the means (18) for retracting, the means (18) for positioning and / or the means (18) for fixing the doctor blade (14) and / or the means for cutting the Scraper blade (14) are at least partially controlled by a common control and / or regulating device. Scraper system according to one of the preceding claims,
characterized in that a supply roll (18) is provided with continuous doctor blade material, from which the blade holder (12) the material required for the respective doctor blade can be fed, wherein the doctor blade material (30) via the retraction and / or extraction means (18) each continuously as needed, ie without being separated, on the one hand from the supply roll (28) off and fed into the blade holder (12) and on the other hand is pulled out of the blade holder. Scraper system according to one of the preceding claims,
characterized in that means are provided for in particular automatic cleaning of the blade holder (12) and / or means (34) for in particular automatic cleaning of the doctor blade (14). Scraper system according to claim 14,
characterized in that the means (34) for automatically cleaning the scraper blade (14) comprises means (36-40) for automatically withdrawing the scraper blade (14) from the blade holder (12) while sticking to the scraper blade (14) and / or the like, wherein for receiving the stripped stickies preferably a collecting container is provided, and preferably also means (18) are provided to automatically retract the scraper blade (14) in the blade holder (12) following the cleaning process.

Images