CA1126557A

CA1126557A - Roll mounting

Info

Publication number: CA1126557A
Application number: CA350,539A
Authority: CA
Inventors: Karl-Heinz Liessem; Erwin Janssen
Original assignee: Individual
Current assignee: Individual
Priority date: 1979-07-24
Filing date: 1980-04-24
Publication date: 1982-06-29
Also published as: DE2929942C3; GB2054758A; JPS5754650B2; FI68107B; SU967283A3; JPS5620824A; BR8004255A; DD151793A5; GB2054758B; IT8023285A0; DE2929942A1; CH647848A5; DE2929942B2; IT1132517B; FI68107C; SE443202B; FI801953A; SE8004471L; AT380908B; ATA322280A

Abstract

Abstract of the Disclosure A roll mounting comprising a bearing member for rotatably receiving a roll journal, said bearing member being movably guided in a bearing housing and being driven in the direction of motion defined by the bearing housing by driving means, said driving means comprising pistons extending in the direc-tion of motion located on both sides of and firmly secured to, the bearing member, said pistons engaging in cylinder disposed in the bearing housing to constitute a piston and cylinder unit acting between the bearing housing and the bearing member.

Description

s~, The invention relates to a roll mounting, and more part-icularly to a roll mounting in which a bearing member supporting the roll is adapted to be driven by a piston and cylinder unit.
A mounting of this kind is described in French Patent Specification No. 2,226,508. In this prior mounting a bearing housing which comprises a rectangular frame carries a bearing member which comprises a rectangular component having an aperture for receiving the bearing for the roll journal, the component being mounted in the rectangular frame and having two opposite rectangular sides guided parallel to and adjacent the correspond-ing rectangular sides of the frame. The piston/cylinder unit is located at one of the transverse sides of the frame, the piston pressing directly against the bearing member.
The mounting disclosed in the said French Patent Specification No. 2,226,508 is for a calender. The bearing hous-ing is screwed to the side of the calender frame, so that the bearing mernber is vertically movable in the housing. Normally the piston/cylinder units are under pressure and are thus prepared for action as described below, but are not otherwise active.
They are thus not adapted to influence the line pressure (i.e.
the pressure at the line of the nip). The line pressure is de-termined by the bottom roll. The piston/cylinder units come into action only in emergency, e.g. in the case of a web break, when the calender has to be opened rapidly. The bottom roll is then quickly lowered and the piston/cylinder units catch the subsequent or top rolls during their downward motion and push the bearing member into the bearing housing, thus softening the impact.

,. ~b 6~

It has also long been known (German Patent Specification 91 573) to use hydraulic piston/cylinder units to adjust the line pressure at the roller nip. Such units are also conventional for calenders (German offenlegungsschrift 20 10 322, United States Patent Specification 3,451,332). However, the known embodiments comprising hydraulic or pneumatic adjustment of the line pressure have a common feature in that the rolls are guidable in some manner on a stand in the screwdown direction, and the devices for exerting pressure are separate units, which bring about motion in the guide. In German Offenlegungsschrift 20 10 332, the calender rolls are mounted in bearing plates movable in vertical sliding guides at the calender frame, whereas in United States Patent 3,451,332, the rolls are mounted by means of a rocker arm.
As a result of the separate nature of the guide and pressure means, the known constructions are very complicated, particularly when the individual line pressures in a calender stack have to be controlled separately (United States Patent Specification No. 3,158,088).
An object of this invention is to simplify the construc-tion of roll devices operating with an adjustable line pressure.
According to this invention there is provided a roll-journal bearing mounting comprising cylinders having interfacing and interspaced open ends, holding means for holding said cylinders against displacement, a movable bearing housing spaced between said ends, and pistons rigidly connected to said housing so as to extend therefrom respectively in opposite directions and into said open ends of the cylinders, the ends of said cylinders opposite to their said open ends being closed so that pressuriæed fluid can be S5~7 fed into the cylinders behind said pistons 50 as to cause movement of the housing and pistons either way in the directions said pistons extend from said housing in said cylinders.
The pistons connected to the bearing housing or member not only apply screwdown forces to produce line pressures but also guide the bearing housing or member, so that no separate guiding structure is needed. The guiding system is particularly efficient, because the pistons may have a relatively large diameter and are disposed on opposite sides of the bearing housing or member or roll journal. The entire bearing system can be made very compact, because the individual pistons do not take up as much space as will be necessary in a cylindrical guide. The latter, in general, must have a guide length at least equal to its diameter. This requirement no longer applies, because the oppositely-disposed pistons of the bearing housing or member co-operate in guidingO
The guide length of the piston is therefore substantially only equal to the required stroke of the bearing member inside the bearing frame carrying the cylinders.
The resulting structural unit can be made so small that it does not project beyond the roll periphery, or not sufficiently to cause an obstruction. Thus, the structure does not hinder or limit the motion of devices co-operating with the roll. It is to be appreciated that such devices would otherwise be hindered by the guide and pressure components.
Theoretically, it is not necessary for the two pistons to be in line at the bearing member or to be disposed in the screw-down direction, but it is preferred that the cylinders are dis-5S'7 posed coaxially in a plane extending through the roll axis and that the cylinders are disposed so their axes extend in the screwdown direction of the roll.
The bearing member is designed to be guided exclusively by the pistons. Usually, the roll journals are mounted in the bearing member so that the roll axis can sag somewhat under the line pressure, without tilting in the bearing. Conse~uently, swivelable bearings of olive configuration are used and the outer bearing surface is mounted on a corresponding partly-spherical surface. Whilst the swivelable bearing is provided so that the roll journal can bend relative to the bearing member in the screw-down direction, the bearing member of course will be able to rotate relative to the roll axis in a plane perpendicular thereto.
Since this is undesirable, it is advisable to use a rotation-preventing means. Thus preferably a rotation-preventing means is provided to prevent the bearing housing or member from rotating around the axis of the pistons but which allows the bear-ing member and the pistons to move in the axial direction thereof.
Conveniently the bearing frame has a rectangular exterior and has a surface parallel to the piston axis or at right angles to the piston axis and adapted to be connected to a machine frame.
This facilitates the construction of the bearing frame by a unit-construction method, which greatly simplifies assembly.
Preferably the bearing frame has a substantially U-shaped part comprising two parallel arms and a base, one cylinder ~Zti55'7 is disposed in the base of the U~shaped part and is open towards the interior of the U-shaped part between said arms, a trans-verse member is provided and connects the free ends of the arms of the U-shaped member and the other cylinder is disposed in said transverse member and is open towards the interior of the U-shaped part between the arms, and the bearing member is dis-posed between the arms, the base and the said transverse member.
The invention includes not only the mounting itself but also a device comprising rolls mounted by mountings in accordance with the invention. In such a device it is preferred that the - bearing ~e~i~ is dimensioned so that it can receive both the . ~ , weight of the rolls and also the forces produced by the line pressure, and the roll is connected to the device exclusively ~ G
by securing members engaging the bearing ho~i~g. Consequently a material-processing device comprising a number of rolls can be constructed in units, using mountings according to the invention, without the need for a separate machine frame containing and guiding all the rolls. Accordingly, the devices can be made much lighter and less expensive without losing stability or accuracy.
In order that the invention may be more readily under-stood and so that further features thereof may be appreciated the invention will now be described by way of example with ref-erence to the accompanying drawings in which:
Figure 1 is a side view, partly in section, of a mount-lng according to the invention;
Figure 2 is a plan view of the embodiment of Figure l;

and ~ igures 3 to 5 are side views of various roll systems equipped with mountings according to the invention.
Figures 1 and 2 show a mounting denoted by the general reference 10. It comprises a U-shaped frame 1 having two limbs

2, 3 and a base 4. The free ends of limbs 2, 3 are intercon-nected by a transverse member 5 which is centred by means of a projection 6 and secured by screws 7 to the end face of limbs 2 and 3, thus producing a stable, substantially rectangular frame. The outer surfaces 8, 8 and 9, 9 of the frame are paral-lel to one another and surfaces 8 and 9 are perpendicular to oneanother, thus producing a box-like structure having precisely located outer surfaces 8,9.
Cylindrical recesses 11, 12 aligned with one another are formed in the base 4 and cross-member 5; the open ends of the recesses face one another and the closed ends are associated with connections for hydraulic oil under pressure.
Pistons 13,14 are disposed in the recesses 11,12 and ,~ h o~
are firmly secured to a bearing~member 15. It will be appreci-ated that the two pistons extend in opposite directions from two opposite sides of the bearing member 15. The member 15 can, of course, be made integrally with the pistons 13,14.
The bearing member 15 has a bearing eye in which a bear-ing 16 is located. The bearing 16 has the form of an olive, so that the bearing can swivel in the member 15. The bearing 16 has a through bore 17 for receiving a roll journal.
In the described embodiment, pistons 13,14 are disposed along a co~non axis which, in the case of a mounting 10 in a 5S'~

rollsystem, extends in the screwdown direction and intersects the roll axis. Owing to the fact that the bearing 16 is an olive the bearing member 15 may rotate around axis 18. To pre-vent this, a rotation-preventing means is provided in the form of a pin 19 extending through limb 2, the pin engaging in a groove 20 formed in bearing member 15 and extending parallel to axis 18.
Spaces 21,22 are left between bearing member 15 and the facing surfaces adjacent the mounting of the recesses 11 and 12, corresponding to the desired overall stroke of bearing member 15 relative to housing 1. The member 15 and consequently the rolls can thus move relative to the housing by correspond-ing amounts in the direction of axis 18, in order to carry out a screwdown motion, to produce a desired line pressure, to com-pensate for changes in the diameter of the rolls after turning, to ventilate the rolls, etc.
~ ~6 ~, The hou~ing l is very stable, so that the forces trans-mitted by the rolls are dissipated by securing means engaging the bearing housing 1, e.g. screws engaging in bores 23.
Figure 3 shows a three-roll calender (general reference 30) in which a mounting according to the invention is used to bear the bottom roll 2L~. A desired line pressure (i.e. pressure at the nip) can be produced by actuating the bottom piston/cyl-inder unit 11,13. Alternatively, rapid opening can be brought about by removing pressure from the bottom piston/cylinder unit 11,13 and applying it to the top piston/cylinder unit 12,14 in which case the central roll 25 falls away from the top roll 26 5S'~

until journal 29 rests on the end slot 28 in bearing arm 27.
Owing to the presence of mounting 10, no projecting, complicated guide and pressure applying means are needed for the bottom roll 24.
Figure 4 shows a three-roll system 40 in which two rolls 33, 34 with mountings 10 in accordance with the invention are mounted at the sides of the bearing housing 31 of the cen-tral roll 32. There is no need for a large machine frame ex-tending up to the side rolls 33 and 34. Instead, the frame is replaced by the self-supporting mountings 10.
Similarly as shown in Figure 5 a calender 50 can be constructed by disposing a top roll 42 on the bottom roll 41, using mountings 10 in accordance with the invention. As shown by broken lines above, calender 50 can be made up to a multiple-roll system by adding further rolls 43, 44 with mountings 10' in accordance with the invention which are directly connected by pins. As before, there is no need for a large machine frame.

Claims

THE EMBODIMENTS OF THE INVENTION IN WHICH AN EXCLUSIVE
PROPERTY OR PRIVILEGE IS CLAIMED ARE DEFINED AS FOLLOWS:

1. A roll-journal bearing mounting comprising cylinders hav-ing interfacing and interspaced open ends, holding means for holding said cylinders against displacement, a movable bearing housing spaced between said ends, and pistons rigidly connected to said housing so as to extend therefrom respectively in opposite directions and into said open ends of the cylinders, the ends of said cylinders opposite to their said open ends being closed so that pressurized fluid can be fed into the cylinders behind said pistons so as to cause movement of the housing and pistons either way in the directions said pistons extend from said housing in said cylinders.

2. The mounting of claim 1 in which said bearing housing has a transverse passage adapted to receive and position the roll-journal bearing with its axis in a fixed position relative to the housing and the axes of said cylinders and pistons are coaxial and intersect said position.

3. The mounting of claim 2 in which said holding means for said cylinders comprises a frame having end cross beams in which said cylinders are fixed and side columns on the sides of said bearing housing and having ends fixed to said cross beams and hold-ing them against displacement, said side columns being interspaced so as to permit said movement of said housing and piston.

4. The mounting of claim 3 in which said frame has at least one outside surface which is flat so that the frame can be fastened to a flat supporting surface.

5. The mounting of claim 3 in which said frame's said cross beams and side columns are right angularly oriented relative to each other and each of said cross beams has an outside surface corresponding to said at least one outside surface.

6. The mounting of claim 5 in which said cylinders are bored in said cross beams and the cylinders and said pistons have radial dimensions large enough for the pistons to support radial loading in all radial directions applied to said bearing housing when a working roll-journal bearing is positioned by said bearing housing.

7. The mounting of claim 6 in which at least one of said cross beams is removably fixed to the ends of said side columns.

8. The mounting of claim 7 in which a bearing is positioned in said passage of said bearing housing and a roll has a roll-journal held by said bearing and has a pressure rolling body of substantially larger radial dimension than that of said journal, the frame's said end cross beams being interspaced by the frame's said side columns a distance related to the stroke lengths of said pistons so as to permit said mounting to be combined with at least one other corresponding mounting and pressure rolling roll.

9. The mounting of claim 8 in which the frame's said side columns are interspaced a distance less than the radial dimension of said pressure rolling body.

10. The mounting of claims 1, 2 or 3, having means for holding said housing against rotation about said axes of the pistons and cylinders while permitting said movement of the housing and pistons.

11. The mounting of claims 4, 5 or 6, having means for holding said housing against rotation about said axes of the pistons and cylinders while permitting said movement of the housing and pistons.

12. The mounting of claims 7, 8 or 9, having means for holding said housing against rotation about said axes of the pistons and cylinders while permitting said movement of the housing and pistons.