Classifications

• • D—TEXTILES; PAPER
  • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
  • D21G—CALENDERS; ACCESSORIES FOR PAPER-MAKING MACHINES
  • D21G1/00—Calenders; Smoothing apparatus
  • D21G1/002—Opening or closing mechanisms; Regulating the pressure

Definitions

• the invention relates to a calender of the type specified in the preamble of claim 1.
• Such calenders are used, for example, in the paper industry for processing or finishing the paper webs. They have a number of intermediate rolls which are arranged between an uppermost and a lowermost roll and can be pressed together by these rolls, as a result of which pressure is generated between the rolls of the calender. Efforts are made to have the gaps - the so-called nips - between the individual rollers, if possible with the same light width over the entire width of the nips. This is known to be disturbed by so-called overhanging weights, which act downward on each roller on both sides. It is known to arrange nip-relieving devices between the roller and the stand of the calender for receiving the overhanging weights.
• the nip relieving devices are hydraulic cylinder / piston motors with which a force can be set which acts against the force of the overhanging weights
• the intermediate rolls are mounted in bearing parts which can be shifted in height along a sliding guide. Since the diameter of the individual rolls in the calender varies due to the wear of their surface, the rolls are in phase wise at different altitudes, which must also be followed by the nip relieving device.
• the supporting parts for the nip relieving devices are usually arranged on the stand so as to be vertically displaceable. The main problem of the previous designs arises from the limited space that is available between the individual rolls to be supported for the nip-relieving device.
• the object of the present invention consists in a construction of the nip-relieving device and its displaceable supporting part, which can be used in the limited space and can be controlled with relatively simple means.
• Existing calenders should be able to be retrofitted with the device according to the invention.
• FIG. 1 shows a calender, schematically from the side
• FIG. 2 shows a nip relieving device according to the invention, partly in section
• FIG. 3 shows the device in view according to arrow A in FIG
• a bearing part 14, in which an intermediate roller 11 is rotatably mounted with its axis 16, is with one part
• the bearing part 14 attached to one side of the niprelieving device 3.
• it is a hydraulic cylinder / piston unit, the piston rod 40 of which, ie the second side of the device 3, is supported on a support part 18 at point 47.
• This part is slidably arranged on the stand 6, parallel to the slide guide 43 and is attached to a threaded spindle 48, which runs parallel to the slide guide 43, is carried by the stand 6 and by means of a motor and transmission, not shown, which are also attached to the stand 6, is rotatable.
• each ⁇ support part 18 can be individually switched on so that it can be customized to the relevant support member 14 correspondingly at the appropriate height position of the bearing member 14 '' in a desired relative position shifted and the bearing part.
• This relative position brings the piston of the Device 3 in a central position in the cylinder space of the device, as required by the given stroke of the piston in the cylinder, in order to be able to participate in the holding, lifting and sinking of the bearing part 14.
• the support part is designed as a nut 57, which is turned by turning the thread spindle . 4J3_ parallel , is displaceable to the slide guide 43.
• the nip relieving device has a bearing sleeve 50, which comprises the threaded spindle 48, which leads through the bearing sleeve 50 without contact.
• the bearing sleeve 50 fastened to the bearing part 14, is screwed on as shown.
• a cylinder space is provided which is used to hold an annular piston 52 -
• the piston 52 is formed, which delimits an upper space 57 and a lower space 53 in the cylinder space.
• the piston 52 is provided with a downward-facing support part 54, which provides the role of a piston rod, so to speak, so that the piston 52, with it the bearing sleeve 50 and, via this, the bearing part 14 on the nut 57, which here is the Represents support part for the niprelieving device, can be supported.
• the displacement of the nut 57 is also possible in that the threaded spindle 48 e.g. is guided in a nut on the stand. When the threaded spindle rotates, it moves up or down. When the catch 56 is disengaged, the nut 57 moves up and down with the threaded spindle 48.
• the nut 57 is an externally axially parallel toothed wheel, into which toothing a pneumatically controllable catch 56 engages in order to prevent the nut 57 from rotating.
• the displacement of the nut 57 is of course only possible with respect to the catch 56 over the length of the external toothing. This must be respected when designing the nut 57.
• the nip relieving device works as follows: When the calender is closed, the rollers 11 are brought into their operating position by lifting by means of the brought bottom roller. The nut 57 is pushed into the desired relative position to the lower edge of the bearing sleeve 50 when the spaces 51 and 53 are opened. By filling the upper space 51 with hydraulic fluid, the piston 52 is pushed down so that the support part 54 comes to rest on the nut 57. The pressure in the space 51 generates the force which is necessary to absorb the overhanging weights.
• the set distance between the lower edge of the bearing sleeve 50 and the nut 57 gives the path by which the individual intermediate roller 11 falls downward from its current working position into the open position when the calender is opened.
• this is also the way that the bearing part 14, in which the roller is mounted, passes when the calender is opened.
• This distance is the smallest for the second uppermost roller in the calender and successively greater for the lower rollers until it is greatest for the second lowest roller 11.
• the object of the invention is not only limited to an application in the case of bearing parts which can be displaced in the stand.
• a nip-relieving device with a threaded spindle and support nut also in a calender, where the individual intermediate rolls on the stand are mounted on levers which are arranged in a pendulum manner and are height-adjustable.

Landscapes

• Paper (AREA)
• Rolls And Other Rotary Bodies (AREA)
• Treatment Of Fiber Materials (AREA)
• Casting Or Compression Moulding Of Plastics Or The Like (AREA)

Applications Claiming Priority (2)

Publications (1)

Family

ID=6326110

Family Applications (1)

Country Status (6)

Families Citing this family (18)

Family Cites Families (11)

• 1987
  • 1987-04-23 DE DE19873713560 patent/DE3713560A1/de active Granted
• 1988
  • 1988-03-08 EP EP88901807A patent/EP0310637A1/de not_active Withdrawn
  • 1988-03-08 FI FI885256A patent/FI885256L/fi not_active IP Right Cessation
  • 1988-03-08 US US07/290,417 patent/US4967653A/en not_active Expired - Fee Related
  • 1988-03-08 JP JP63501976A patent/JPH01502995A/ja active Pending
  • 1988-03-08 WO PCT/DE1988/000126 patent/WO1988008467A1/de not_active Application Discontinuation

Non-Patent Citations (1)

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