Classifications

• • D—TEXTILES; PAPER
  • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
  • D21G—CALENDERS; ACCESSORIES FOR PAPER-MAKING MACHINES
  • D21G3/00—Doctors
  • D21G3/005—Doctor knifes

Definitions

• the invention relates to a doctor blade holding device, which has a receiving unit which is provided for receiving a scraper blade.
• Such a doctor blade holding device can be used, for example, in a paper mill in paper making or in the steel industry. It usually serves to receive a scraper blade for the purpose of uniform contact of the same with a rotating roller in order to clean its surface during operation.
• a roll may have a diameter of, for example, 1 m-6 m and a length of up to 10 m.
• the scraper blade provided for cleaning such a roller must rest over the entire length of the roller as uniformly as possible at a predetermined angle to the roller.
• the doctor blade is generally applied to the roll at a line pressure of between 100 and 400 Newtons per meter.
• a conventional scraper blade has a length of up to 10 m, a width of 7.5 cm and a thickness of 1.5 mm.
• a conventional doctor blade is made of carbon fiber material.
• the scraper blade During operation of the scraper blade, the area of the scraper blade resting against the roller is more and more ground, so that the remaining width of the scraper blade is increasingly reduced. Has reached a width of for example 6,5 cm, the scraper blade, then it is regarded as exhausted and a new doctor blade it sets ⁇ .
• the doctor blade consists of an interchangeable blade, which is pressed in operation directly to the surface of a roller, and a holding blade, which forms a support for the interchangeable blade.
• the interchangeable blade is an endless blade wound on a roll, which in use is applied to the surface of the rotating roll and the other end is wound on a take-up roll. In each case, a portion of the endless blade with the roll surface in contact. If this portion is worn, then the endless blade can be further rolled up, so that a new portion of the endless blade can be contacted with the roll surface.
• the object of the invention is to show a way in which the costs of cleaning the surface of a rotating roller can be reduced.
• the advantages of the invention are, in particular, that because of the use of an additional doctor blade carrier, doctor blades with a smaller width can be used. Since the scraper blade carrier utilizes a material that is much less expensive than the material of which a scraper blade is made, and because smaller width scraper blades can be used, the cost of cleaning the surface of a rotating roller is significantly reduced compared to the prior art ,
• the doctor blade carrier according to the invention is preferably formed in one of its end regions as well as a conventional doctor blade and is inserted with this end region into the receiving unit of the doctor blade holding device. In the region of the doctor blade carrier protruding from the receiving unit, fastening means for a doctor blade are provided.
• a scraper blade is used, which may have a much smaller width compared to the prior art, for example 3 - 4 cm. For example, about 2 to 3 cm of this scraper blade project beyond the end of the scraper blade carrier in the direction of the roller to be processed. During operation, as well as in the prior art, about 1 cm of this protruding area of the doctor blade is ground off until the doctor blade is consumed and is replaced and then disposed of. In contrast to the prior art, however, far less scraper material has to be disposed of.
• doctor blade carrier according to the invention which is inserted into the receiving unit of the doctor blade holding device, can also be used in connection with the new doctor blade in the case of a replacement of a doctor blade.
• the fastening means by means of which the scraper blade is fastened to the scraper blade carrier, have a fixing strip and a fixing spring connected to the fixing strip.
• This allows a simple and quick withdrawal of a used ⁇ chaber- blade from the doctor blade holder and a simple and fast insertion of a new doctor blade in the doctor blade holder. Insbesonde- This extraction and insertion can be done without the use of tools.
• the doctor blade carrier is provided with bores and the fastening means are connected to the doctor blade carrier by means of screws guided through the bores, the sufficiently fixed fixation of the doctor blade required for the cleaning operation is ensured. On the other hand, if necessary, the screws can be loosened and the fasteners removed from the doctor blade carrier, for example for the purpose of replacement or cleaning.
• a welding of the fastening means with the Scherberbling carrier has the advantage of ensuring a sufficiently firm fixation of the doctor blade with a reduced expenditure of time for the attachment of the fastening means on Schaberklingenovic, but does not allow subsequent removal of the fasteners from the doctor blade carrier.
• the doctor blade can be inserted in a simple manner between the fixing strip and the doctor blade carrier until it rests on the fixing strip.
• the individual components of the fastening means are made of stainless steel, whereby a long-term use is ensured during operation.
• FIG. 1 shows an embodiment of a scraper blade holding device according to the invention and Figure 2 is an enlarged view of a portion of the device shown in Figure 1.
• the doctor blade holding device shown in FIG. 1 is based on a doctor blade holding device, as described in WO 2004/042143. It has a base plate 6, which is substantially U-shaped and has two short and one long boundary wall. In the end of one of the short boundary walls, a bearing tube 5 is arranged, which is part of the base plate. The bearing tube 5 is mounted within a slotted square tube 4 and rotatable about a small angle to this.
• the square tube 4 can be constructed segment-shaped in the direction perpendicular to the plane of the drawing in order to minimize the elasticity of the cover plate 2.
• the square tube is fixedly connected to the cover plate 2, preferably by means of a plurality of fferverbindun- which are arranged perpendicular to the plane one behind the other, but not shown in the drawing.
• the cover plate 2 is preferably made of carbon fiber material and may have a plurality of carbon fiber layers. As a result, the cover plate is flexible and can adapt well to the surface of each roller to be cleaned.
• finger devices 3 are fastened to the cover plate by means of screw connections 3 a, which are likewise arranged one behind the other perpendicular to the plane of the drawing.
• screw connections 3 a which are likewise arranged one behind the other perpendicular to the plane of the drawing.
• a scraper blade carrier 8 is used, in contrast to the prior art.
• Insertion of the doctor blade carrier is preferably carried out by insertion in the axial direction, ie in a direction perpendicular to the plane of the drawing.
• the back area of the doctor blade carrier is formed as well as the rear portion of a conventional doctor blade, so that no structural changes of the receiving unit are necessary in order to accommodate a Schaberklingenarme invention instead of a conventional doctor blade can. Since the rear area of the doctor blade carrier 8 is provided with a rivet or spring 15, the doctor blade carrier 8 can not be pulled out in the direction of the roller to be cleaned during operation of the device.
• the scraping blade carrier 8 In its region protruding from the receiving unit 2, 3, the scraping blade carrier 8 is provided with fastening means 10, 11, 12 for a doctor blade 1.
• These fastening means include an angle-shaped fixing strip 11, a fixation spring 12 and screws 10 connected to the fixing strip. These screws are guided through bores 13 of the doctor blade carrier 8 and screwed into an internal thread of the angularly formed fixing strip 11 in order to secure this fixing strip 11 to connect the Schaberklingenarme 8.
• the fixing spring 12 forms either together with the fixing strip 11 is a one-piece component or is welded to the fixing strip.
• the fixing spring is intended to press a scraper blade 1 inserted between the front end area of the scraper blade carrier 8 and the fixing unit 11 against the scraper blade carrier 8, so that the scraper blade 1 during cleaning operation of the roller has the required fixed positioning at a predetermined angle relative to the scraper blade carrier 8 to be cleaned Roller has.
• the fixing strip can also be welded to the Schaberklingenitati 8.
• the doctor blade carrier 8, the fixing strip 11 and the fixing spring 12 made of stainless steel, so that a long-term use of these components is ensured.
• the doctor blade carrier 8 has, for example, a length of up to 10 m, a width of 5 cm and a thickness of 1.5 mm. It is resilient, so that diameter deviations of the roller can be compensated.
• the length of the doctor blade carrier extends in the axial direction of the roller or perpendicular to the plane of the drawing.
• the width b of the doctor blade carrier and the thickness d of the doctor blade carrier are marked in FIG.
• the scraper blade 1 fastened to the scraper blade carrier 8 by means of the fastening means 10, 11, 12 can have a substantially smaller width compared with the scraper blades known from the prior art.
• the scraper blades known from the prior art have, for example, a width of 7.5 cm, as already explained above.
• the back or underside of these known doctor blades is inserted directly into the receiving unit of the known doctor blade holding device. Since, after a successful during cleaning operation grinding the doctor blade to about 1 cm, ie when reaching a width of about 6.5 cm, the doctor blade is considered consumed and disposed of, must in the prior art, a relatively large part of the doctor blade be disposed of. This procedure is costly and does not spare the environmental resources.
• a doctor blade whose width is, for example, only 3.5 cm can be used.
• the underside of this scraper blade is not inserted into the receiving unit of the scraper blade holding device, but fastened by means of fastening means on a Schaberklingenarme, which in turn is inserted into the receiving unit of the doctor blade holder.
• the scraper blade carrier can also be replaced after replacing a needed scraper blade to be reused.
• the scraper blade used in the invention is ground in operation as well as a known scraper blade by about 1 cm and then considered to be used up and replaced with a new doctor blade.
• the part of the spent doctor blade has to be disposed in this embodiment only has a width of about 2.5 cm, so that compared to the prior art much less doctor blade material must be disposed of.
• a pneumatic air hose 14 is provided in the interior of the U-förrt ⁇ igen base plate 6. This is provided at its one end with an air connection, through which air can be pressed into the hose and also air from the hose can be omitted. The other end of the tube 14 is closed. Between the tube 14 and the long boundary wall of the U-shaped base plate 6, a plastic insert 7 is provided. This is loosely inserted, glued or screwed on the inside of the base plate and prevents the hose 14 comes into contact with a possibly hot boundary wall during operation of the device.
• the ⁇ chaber blade holding device shown in the figure 1 in the vicinity of the bearing tube 5 a first spring plate 16, one end of which at the Base plate 6 is fixed, for example, welded.
• the other end region of the spring plate 16 is supported on the cover plate 2.
• the spring plate 16 serves inter alia as dust protection, so that no dust can penetrate into the slot of the slotted square tube 4.
• a second spring plate 18 is fastened to the cover plate 2 by means of a screw or rivet connection 20, which bridges the region between the end of the boundary wall 9 of the base plate 6 and the cover plate 2 and extends on the outside of the Boundary wall 9 of the base plate 6 is supported.
• This spring plate 18 also serves as ⁇ dust cover or dirt seal.
• the spring plate 18 slides both in an increase as well as a decrease in the air pressure in the hose 14 on the outer surface of the boundary wall 9 along.
• an adapter bar 17 is firmly connected, for example using screws 21.
• This adapter bar 17 is on the remote from the cover plate 2 Outside of the spring plate 16 and the base plate 6 is positioned.
• FIG. 1 In the figure 1 after all a Schaberklingenhalte- device is shown, in which the pivoting plane of the doctor blade holding device is designed and arranged in a special way.
• the scraper blade holding device shown in FIG. 1 only requires one air hose, since the bringing about of the starting position of the cover plate is effected by the force of the spring plate 16.
• this forms from the base plate 6, the spring plate 18, a part of the cover plate 2, the square tube. 4 and the spring plate 16 formed a substantially dustproof unit system.

Landscapes

• Paper (AREA)
• Cleaning In General (AREA)
• Preliminary Treatment Of Fibers (AREA)
• Coating With Molten Metal (AREA)
• Load-Engaging Elements For Cranes (AREA)

Applications Claiming Priority (2)

Publications (2)

Family

ID=37950187

Family Applications (1)

Country Status (6)

Families Citing this family (2)

Family Cites Families (11)

• 2006
  • 2006-03-25 DE DE102006013892A patent/DE102006013892B3/de not_active Expired - Fee Related
• 2007
  • 2007-03-20 AT AT07727094T patent/ATE469267T1/de active
  • 2007-03-20 WO PCT/EP2007/052617 patent/WO2007110353A1/fr active Application Filing
  • 2007-03-20 CA CA2644918A patent/CA2644918C/fr not_active Expired - Fee Related
  • 2007-03-20 EP EP07727094A patent/EP2002052B1/fr not_active Not-in-force
  • 2007-03-20 DE DE502007003937T patent/DE502007003937D1/de active Active
  • 2007-03-20 US US12/225,003 patent/US7828937B2/en active Active

Non-Patent Citations (1)

Also Published As

Similar Documents

Legal Events