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 with the features specified in the preamble of claim 1.
• Such a doctor blade holding device can be used, for example, in a paper mill in the context of paper production or in the steel industry. It is used to hold a scraper blade for the purpose of even contact with a rotating roller or roller in order to clean its surface during operation.
• a roller can have a width of several meters.
• the scraper blade provided for cleaning such a roller must lie against the roller as evenly as possible at a predetermined angle over the entire length of the roller. To achieve this, the doctor blade is generally applied to the roller with a relatively large pressure.
• a scraper blade holding device which has two holding elements.
• a first part of the doctor blade is inserted between the holding elements mentioned.
• the second part of the doctor blade leads away from the holding elements.
• One of these holding elements is a plate that consists of a multiplicity of fiber layers. The number and orientation of these fiber layers depends on the desired working conditions of the doctor blade.
• two pneumatic hoses are provided, one of which - from the doctor's point of view - is located in front of and behind a pivot point.
• the fulcrum is provided in the central area of the base plate.
• the desired contact pressure of the scraper blade on the roller can be adjusted by suitably inflating or emptying the hoses.
• the known device has a flexible seal which is intended to prevent the introduction of dust and other foreign bodies. Since this flexible seal must extend over the entire length of the roller, its implementation is complex. In addition, because of the high temperatures that occur during operation, it is heat-resistant
• a scraper arrangement is known from EP 1 186 703 A2, which has a blade carrier and a scraper blade.
• the blade carrier is arranged on a blade holder so as to be pivotable about an axis, with at least one pressure element being arranged between the blade carrier and the blade holder, which is independent of the pressure, i.e. H. maintains its basic shape.
• a pressure element is preferably arranged on both sides of the axis. With this arrangement, too, the axis is located in the central region of the base plate or blade holder.
• the pressure elements mentioned which are hoses, the desired contact pressure of the doctor blade against the roller can be set and the doctor blade can also be lifted off the roller by generating a suitable counterpressure. If this known scraper arrangement is used without a seal, then frequent cleaning of the device is necessary. However, this is extremely difficult due to the narrow installation situation.
• the invention is based on the object of specifying a doctor blade holding device in which the disadvantages mentioned above do not occur. This object is achieved by a doctor blade holding device with the features specified in claim 1. Advantageous refinements and developments of the invention result from the dependent claims.
• the advantages of the invention are, in particular, that a separate dirt or dust seal can be omitted due to the claimed design and positioning of the axle.
• the pivot bearing advantageously also serves as a dirt or dust seal. Consequently, it is not necessary to use complex and expensive rubber or Viton seals.
• the cover plate is connected to a slotted square tube, within which the one
• End region of the base plate provided bearing tube is rotatable.
• the cover plate can be removed in a simple manner, so that cleaning work within the device and replacement of the air hose are facilitated. In particular, it is not necessary to remove a large number of screws in order to be able to remove the cover plate.
• the features of claim 7 ensure that components located in the inner region of the base plate, in particular the pneumatic hose, are protected from contact with the boundary walls of the base plate, which in some cases become very hot during operation.
• the features of claim 8 ensure that the scraper blade holding device manages with only one hose. If the hose is filled with air, depending on the air pressure this leads to a stronger pressing of the doctor blade against the roller to be cleaned. At the same time, a spring is pulled apart or tensioned. If the air is released from the hose, the spring that contracts or relaxes causes the scraper blade to be lifted off the roller to be cleaned.
• a second hose as is provided in the previously known arrangements, is not necessary. The spring return mentioned is necessary, for example, for changing the doctor blade.
• part of the cover plate, the square tube, the base plate and the shoe form an essentially dust-proof unit.
• the scraper blade holding device shown in FIG. 1 has a base plate 6 which is essentially U-shaped and has two short and one long boundary wall.
• a bearing tube 5, which is part of the base plate, is arranged in the end region of one of the short boundary walls.
• the bearing tube 5 is mounted within a slotted square tube 4 and rotatable by a small angle to it.
• the square tube is firmly connected to a cover plate 2, preferably by means of a plurality of screw connections which are arranged one behind the other perpendicular to the plane of the drawing, but are not shown in the drawing.
• the cover plate 2 is preferably made of carbon fiber material and can have several carbon fiber layers. As a result, the cover plate is flexible and can adapt well to the surface of the roller to be cleaned.
• finger devices 3 are fastened to the cover plate by means of screw connections 3a, which are also arranged one behind the other perpendicular to the plane of the drawing.
• the scraper blade 1 is inserted between the cover plate 2 and the finger devices 3. This introduction of the doctor blade is preferably carried out by inserting it in the axial direction. Since the rear end region of the doctor blade is provided with a rivet or spring 15, the doctor blade cannot be pulled out in the direction of the roller to be cleaned during operation.
• a pneumatic air hose 14 is provided in the inner region of the U-shaped base plate ⁇ . This is provided at one end with an air connection through which air can be pressed into the hose and air can also be let out of the hose. The other end of the hose 14 is closed.
• a plastic insert 7 is provided between the hose 14 and the long boundary wall of the U-shaped base plate 6. This is loosely inserted, glued or screwed onto the inside of the base plate and prevents the hose 14 from coming into contact with a possibly hot boundary wall during operation of the device.
• the air pressure in the hose 14 is increased, it expands. This causes the cover plate 2 to be pushed away from the base plate 6 in the region of the hose 14. This in turn has the consequence that the scraper blade, which is in the area of the front end of the cover plate this is fixed, is moved in the direction of arrow x ⁇ be or is pressed in the direction x. As a result, the doctor blade is placed on the roller surface to be cleaned and the desired contact pressure is set using a pressure control valve.
• a spring 8 is provided in the inner region of the U-shaped base plate 6. One end of which is connected to the long boundary wall of the base plate 6. The other end of the spring 8 is fastened to a shoe 10 which is provided for receiving the rear end region of the cover plate 2.
• the shoe forms a guide rail in a direction perpendicular to the plane of the drawing, within which the cover plate is mounted so as to be displaceable in the axial direction.
• the shoe is provided with a sliding surface 11 which is arranged parallel to a boundary wall 9 of the U-shaped base plate.
• the shoe 10 can be pivoted together with the cover plate relative to the base plate. This pivotability is provided by the fact that in the boundary wall 9 of the base plate there are provided elongated holes 13 through which rivets 12 connected to the sliding surface 11 of the shoe are guided.
• FIG. 1 shows a new type of scraper blade holding device which does not require an additional elastic dust and dirt seal. This is essentially achieved by the claimed special design and arrangement of the swivel plane of the doctor blade holding device.
• the design of the doctor blade holding device according to the invention also makes it possible to get by with only one air hose, since the starting position of the cover plate is brought about using a relaxing spring.
• the system formed from the base plate, the shoe, the square tube and a part of the cover plate preferably forms an essentially dust-tight unit.
• the scraper blade holding device shown in FIG. 2 has a base plate 6 which is essentially U-shaped and has two short and one long boundary wall.
• a bearing tube 5, which is part of the base plate, is arranged in the end region of one of the short boundary walls.
• the bearing tube 5 is mounted within a slotted square tube 4 and rotatable by a small angle to it.
• the square tube 4 can be segment-shaped in the direction perpendicular to the plane of the drawing in order to impair the elasticity of the cover plate 2 as little as possible.
• the square tube is firmly connected to the cover plate 2, preferably by means of a large number of screw connections which are arranged one behind the other perpendicular to the plane of the drawing, but are not shown in the drawing.
• the cover plate 2 is preferably made of carbon fiber material and can have several carbon fiber layers. As a result, the cover plate is flexible and can adapt well to the surface of the roller to be cleaned.
• finger devices 3 are attached to the cover by means of screw connections 3a.
• plate attached which are also arranged one behind the other perpendicular to the plane of the drawing.
• the scraper blade 1 is inserted between the cover plate 2 and the finger devices 3.
• the scraper blade is preferably introduced by being pushed in in the axial direction. Since the rear end region of the doctor blade is provided with a rivet or spring 15, the doctor blade cannot be pulled out in the direction of the roller to be cleaned during operation.
• a pneumatic air hose 14 is provided in the inner region of the U-shaped base plate 6. This is provided at one end with an air connection through which air can be pressed into the hose and air can also be let out of the hose. The other end of the hose 14 is closed.
• a plastic insert 7 is provided between the hose 14 and the long boundary wall of the U-shaped base plate 6. This is loosely inserted, glued or screwed onto the inside of the base plate and prevents the hose 14 from coming into contact with a possibly hot boundary wall during operation of the device.
• the air pressure in the hose 14 is increased, it expands. This causes the cover plate 2 to be pushed away from the base plate 6 in the region of the hose 14. This in turn has the consequence that the doctor blade, which is fastened to the cover plate in the region of the front end thereof, moves in the direction of the arrow x or is pressed in the direction x. As a result, the doctor blade is placed on the roller surface to be cleaned and the desired contact pressure is set using a pressure control valve. Furthermore, the scraper blade holding device shown in FIG. 2 has a first spring plate 16 in the vicinity of the bearing tube 5, one end region of which is attached to the base plate 6, for example welded on.
• the other end region of the spring plate 16 is supported on the cover plate 2, so that it is pressed away to lift off the scraper device when the blade is changed.
• the hose 14 must be depressurized for this blade change.
• the spring plate 16 also serves as a dust protector, so that no dust can penetrate 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 area between the end of the boundary wall 9 of the base plate 6 and the cover plate 2 and is located on the outside of the Boundary wall 9 of the base plate 6 supports.
• This spring plate 18 also serves as dust protection or dirt seal.
• the spring plate 18 slides along the outer surface of the boundary wall 9 both with an increase and with a decrease in the air pressure in the hose 14.
• an adapter strip 17 is firmly connected to the spring plate 16 and / or the base plate 6, for example using a screw 21.
• This adapter strip 17 is on the one remote from the cover plate 2 Positioned outside of the spring plate 16 or the base plate 6.
• FIG. 2 shows a new type of doctor blade holding device in which the pivoting plane of the doctor blade holding device is designed and arranged in a special way.
• the shown in Figure 2 The scraper blade holding device only requires an air hose, since the starting position of the cover plate is brought about by the force of the spring plate 16.
• the system formed 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 preferably forms an essentially dust-proof unit.

Landscapes

• Cleaning In General (AREA)
• Paper (AREA)
• Preliminary Treatment Of Fibers (AREA)
• Centrifugal Separators (AREA)
• Catching Or Destruction (AREA)
• Control And Other Processes For Unpacking Of Materials (AREA)
• Manufacturing And Processing Devices For Dough (AREA)
• Supply And Installment Of Electrical Components (AREA)
• Harvester Elements (AREA)
• Treatment Of Fiber Materials (AREA)

Applications Claiming Priority (3)

Publications (2)

Family

ID=32115390

Family Applications (1)

Country Status (8)

Cited By (1)

Families Citing this family (16)

Family Cites Families (10)

• 2002
  • 2002-11-08 DE DE10251983A patent/DE10251983A1/de not_active Withdrawn
• 2003
  • 2003-07-29 WO PCT/EP2003/008342 patent/WO2004042143A1/fr not_active Application Discontinuation
  • 2003-07-29 CA CA002502955A patent/CA2502955C/fr not_active Expired - Lifetime
  • 2003-07-29 DE DE50303252T patent/DE50303252D1/de not_active Expired - Lifetime
  • 2003-07-29 ES ES03810388T patent/ES2262028T3/es not_active Expired - Lifetime
  • 2003-07-29 AT AT03810388T patent/ATE325234T1/de active
  • 2003-07-29 AU AU2003255312A patent/AU2003255312A1/en not_active Abandoned
  • 2003-07-29 US US10/534,224 patent/US7665178B2/en active Active
  • 2003-07-29 EP EP03810388A patent/EP1567715B1/fr not_active Expired - Lifetime

Non-Patent Citations (1)

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