Classifications

• • D—TEXTILES; PAPER
  • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
  • D21F—PAPER-MAKING MACHINES; METHODS OF PRODUCING PAPER THEREON
  • D21F1/00—Wet end of machines for making continuous webs of paper
  • D21F1/32—Washing wire-cloths or felts
• • D—TEXTILES; PAPER
  • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
  • D21F—PAPER-MAKING MACHINES; METHODS OF PRODUCING PAPER THEREON
  • D21F1/00—Wet end of machines for making continuous webs of paper
  • D21F1/34—Construction or arrangement of spraying pipes

Definitions

• This invention relates to a device for flushing especially endless wires of paper making machines with a cleaning fluid, said device comprising a drive means operative for transmitting rotary motion of a reversible direction, a motion converter arranged to change the rotary motion into a recipro ⁇ cating, linear one and at least one flushing means ejecting a jet of fluid and having an inlet for cleaning fluid.
• a wire is a wire cloth of a plastic material, steel or the like in the form of an endless belt used in paper making machines. The wire travels in its longitudinal direction over a number of rolls and is propelled at a rate suitable for the current paper manufacture.
• a suf- ficient amount of pulp is continuously supplied to the upper part of the wire and the paper web to be formed is travelling in the extension of the upper part of the wire further through the press section of the paper making machine.
• the wire For the best possible way of function of the wire it must be cleaned by flushing its lower portion preferably from below so that deposits in the form of remaining rests of e.g. pulp are removed from it.
• Flushing is usually carried out in that water of a high pressure is supplied to a plurality of flushing nozzles located beneath the lower part of the wire, said nozzles being arranged in a successive row so that they cover the entire width of the wire.
• the flushing device is usually so embodied that each flushing nozzle performs a reciprocating linear movement during flushing calculated transversely of the wire.
• An eccentric mechanism for conversion of the rotary motion of a drive motor into a reciprocating linear motion of the flushing nozzles is then normally used due to which the linear
• OM motion rate of the flushing nozzles will vary for a motion cycle.
• the uneven motion rate necessitates flus ⁇ hing of the wire for long periods of time and with a relatively high pressure of the cleaning fluid before a satisfactory cleaning of the wire is obtained.
• More ⁇ over it has been found to be problematic to accomplish an easy running bearing permitting a reciprocating li ⁇ near motion of the flushing means. This is primarily due to the fact that the flushing means mostly has a rela- tively great length and that it operates in an extre ⁇ mely dirty environment.
• the flushing device is so designed that both its drive means and motion converter can be placed at an arbitrary distance from the paper making machine, and in this way they can be simply protected from an aggres ⁇ sive environment. 2) Both the drive means, motion converter and sup ⁇ ply pipe for cleaning liquid can be placed on the non- service side of the paper making machine.
• the motion converter is so designed that the li ⁇ near motion of the flushing nozzles will be very even and fine which means that each mesh of the wire can be flushed so efficiently that the need of using high pres ⁇ sures of the cleaning fluid is reduced, at the same time as the operating time of the flushing device can be minimized. 7) Almost all so-called "dead travel" due to play has been eliminated as the flushing device only shows a few number of movable parts.
• Fig.1 is a lateral view, partly in section, showing a flushing device according to the invention exclusive of the very drive means
• Fig.2 is a lateral view and, on a larger scale, a longitudinal section of the motion converter of the flushing device
• Fig.3 is a lateral view of the flushing means of the flushing device, partly in section
• Fig. 4 is a section along the line IV-IV in Fig. 3.
• a flushing device com ⁇ prises three connected units in the form of a drive means (not shown) , a motion converter 1 and a flushing means 2.
• the drive means comprises a reversible electric motor which is connected, optionally via a gear, to a half 4 of a coupling 3 of the motion converter 1 (see Fig 2) .
• the other half 5 of the coupling 3 is connected to a motion screw in the form of a ball screw 6.
• the ball screw 6 mounted in a bearing unit 7 supports an associated nut 8.
• the free end 9 of the ball screw 6 projects into a hollow shaft 10, to which the nut 8 is connected.
• the shaft 10 is externally axially displace- ably mounted via a ball bushing 20 relative to a surro ⁇ unding housing 21.
• a linear reciprocating axial motion of the shaft 10 is accomplished.
• the stroke length of the linear motion is decided by the distance between two contact-free transducers 11, 12, which are arranged to actuate the direction of rotation of the drive means.
• the transducers 11, 12, are actuated by a pin 13 projecting from the shaft 10 and running in a longi ⁇ tudinal groove 14 in the housing 21, and in this way the shaft 10 is simultaneously prevented from rotation.
• the flushing means 2 comprises an interior pipe 30 which is provided with a plurality of flushing nozzles 31. Further, the flushing means 2 comprises an outer pipe 32 surrounding the interior pipe 30. A number of bearing means 33 are arranged on the outside of the interior pipe 30, which enable an axial displacement of the interior pipe 30 in the outer pipe 32.
• the out- er pipe 32 is provided with a longitudinal groove 34 so that jets of cleaning fluid from the flushing nozzles 31 may pass by the outer pipe 32.
• the outer pipe 32 should be adapted e.g. to the founda ⁇ tion of a paper making machine at a suitable distance from the object to be flushed, e.g. a wire. Adaptation is carried out so that the groove 34 faces the object to be flushed, i.e.
• a guide means in the form of a pipe 43 is arranged, the object of which is to orient the interior pipe 30 in respect of turning relative to the outer pipe 32 so that the jet nozzles 31 of the in ⁇ terior pipe 30 will always be straight in front of the groove 34.
• Each bearing means 33 is slidingly mounted relative to two rods 37, 38 passing through.
• the ends of the rods 37, 38 are connected to two flanges 39, 40 arranged in spaced relationship to each other, and, in their turn, connected to the interior pipe 30.
• the bearing means 33 is preferably manufactured from some suitable plastic material and shows openings 35, 36 adapted to the outer contours of the rods 37, 38.
• the bearing means 33 has a clearance recess for the interior pipe 30 and its outer contour is made to abut parts of the inner surface of the outer pipe 32.
• All bearing means 33 and flanges 39, 40 have recesses 44 and 45, respectively, corresponding to the pipe 43. It should also be mentio ⁇ ned that it may be suitable to arrange the rods 37, 38 so that they are detachable from the flanges 39, 40, which enables a simple replacement of worn down or damaged bearing means 33.
• the interior pipe 30 with the slidingly arranged bearing means 33 has a detachable end plug 50 at its end facing away from the motion converter 1 , said plug sealing this end of the interior pipe 30.
• the interior pipe 30 is detachably connected via a pipe coupling 51 to a sup ⁇ ply pipe 52 for cleaning fluid, for example in the form of high pressure water.
• the drive means By providing the drive means with speed control you can, if desired, adapt the linear motion velocity of the motion converter 1 to the current velocity of the wire and, consequently, optimize the cleaning process. It should be realized that the flushing means of the invention of course is useful for many other objects besides flushing of said wires.

Landscapes

• Paper (AREA)
• Cleaning By Liquid Or Steam (AREA)

Applications Claiming Priority (2)

Publications (1)

Family

ID=20352717

Family Applications (1)

Country Status (4)

Families Citing this family (1)

Family Cites Families (5)

• 1983
  • 1983-09-30 SE SE8305368A patent/SE451737B/sv not_active IP Right Cessation
• 1984
  • 1984-09-27 WO PCT/SE1984/000315 patent/WO1985001531A1/en not_active Ceased
  • 1984-09-27 EP EP19840903574 patent/EP0156873A1/en not_active Withdrawn
• 1985
  • 1985-05-30 FI FI852174A patent/FI81401C/fi not_active IP Right Cessation

Non-Patent Citations (1)

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