Roll or roller – Rotatable relative to supporting shaft
Reexamination Certificate
2001-05-04
2004-02-03
Cuda Rosenbaum, I (Department: 3726)
Roll or roller
Rotatable relative to supporting shaft
C492S007000, C492S020000
Reexamination Certificate
active
06685610
ABSTRACT:
FIELD OF THE INVENTION
The present invention relates to a deflection compensated roll for a paper/board or finishing machine, comprising a stationary roll shaft, and a, roll shell adapted to be rotatable around the same and mounted with slide bearing elements upon the roll shaft, said slide bearing elements being provided with hydraulic fluid feeding means for loading the slide bearing elements with a hydraulic fluid, and said roil being intended to form a nip together with a counter roll.
BACKGROUND OF THE INVENTION
FI patent 98320 describes a slide bearing assembly for a deflection compensated roll, wherein the roll shell is able to shift or perform a stroke relative to the roll shaft both in a main loading plane and in a lateral bearing plane perpendicular thereto. One implementation of such a “movable shell” roll will be described more closely hereinafter in reference to
FIGS. 1-3
. On the other hand, Finnish patent application No. 990329 discloses a solution for fitting a roll with slide bearings in such a way that the shell is not able to move relative to the shaft, the roll shell bearing assembly allowing substantially no stroke. This type of solution will be described more closely hereinafter in reference to FIG.
4
.
FIGS. 1 and 2
show in schematic elevations a prior art tubular roll with slide bearings, such that
FIG. 1
is an axial elevation of the roll and
FIG. 2
is a sectional view taken along a line II—II of the roll depicted in FIG.
1
. In
FIGS. 1 and 2
the deflection compensated roll is generally designated with reference numeral
110
and it comprises a stationary roll shaft
111
, upon which is rotatably fitted a roll shell
112
which is supported on the roll shaft by means of hydraulic loading elements
117
. The hydraulic loading elements
117
work in the direction of a nip plane and enable an adjustment of the roll shell
112
regarding its contour and a control of the roll regarding its axial nip profile.
The roll
110
has its bearing system implemented by means of slide bearing elements, whereof the slide bearing elements, acting in the direction of loading, in the case of a roll shown in
FIGS. 1 and 2
in the direction of a nip plane, are designated with reference numerals
114
and
114
a
. The first slide bearing elements
114
work in the direction of a nip, i.e. against loading, and the second slide bearing elements
114
a
work in the opposite direction. The exemplary embodiment of
FIGS. 1 and 2
further shows that the roll
110
is also provided with slide bearing elements
115
,
115
a
working laterally relative to the loading direction and acting in opposite directions. The roll
110
is a roll totally furnished with slide bearings, which is also provided with slide bearing elements
116
,
116
a
acting in directions axially opposite to each other and abutting against roll ends
113
,
113
a
through the intermediary of an oil film. As shown in
FIGS. 1 and 2
, the radially acting slide bearing elements
114
,
115
,
114
a
,
115
a
abut against the inner surface of the roll shell
112
through the intermediary of an oil film. In the representation of
FIG. 1
, the radially acting slide bearing elements
114
,
114
a
,
115
,
115
a
are arranged in pairs, such that there are two specimens of each slide bearing element set side by side in axial direction. From the functional point of view, however, such an arrangement is not an absolute necessity as the bearing system can also be implemented by using just single slide bearing elements.
On the other hand,
FIG. 2
suggests that the slide bearing elements
114
,
114
a
,
115
,
115
a
be adapted to act in the direction of loading and in the direction lateral thereto. However, there could be additional slide bearing elements adapted to work radially in various angular positions.
FIG. 3
shows schematically and in partial section one prior art arrangement for supporting a slide-bearing mounted roll and for fitting the same with bearings in a loading direction, i.e. in the direction of a nip plane regarding the roll
110
depicted in FIG.
1
. In
FIG. 3
, the roll shaft is also designated with reference numeral
111
and the roll shell with reference numeral
112
. The following description deals first with the support system of
FIG. 3
in terms of its construction and then with the support system in terms of its function.
The roll shell
112
is supported against an inner surface
112
′ of the roll shell by means of loaded slide bearing elements
114
,
114
a
which, as shown in
FIG. 3
, work actively in opposite directions, such that the first slide bearing element
114
loads the roll shell
112
toward an external load applied to the roll shell, i.e. toward a nip, and the second slide bearing element
114
a
in the opposite direction, respectively. In the construction of
FIG. 3
, the slide bearing elements
114
,
114
a
are provided with pressurizable cavities
61
,
61
a
, and for each slide bearing element
114
,
114
a
the roll shaft
111
is fitted with body blocks
63
,
63
a
which penetrate into said cavities
61
,
61
a
of the slide bearing elements, the body blocks
63
,
63
a
being sealed relative thereto by means of packings
63
′,
63
′
a
so as to allow a movement of the slide bearing elements
114
,
114
a
relative to the body blocks
63
,
63
a
. In structural sense, the slide bearing elements
114
,
114
a
are conventional by having the outer surface thereof provided with oil pockets
64
,
64
a
which are in communication with the cavities
61
,
61
a
by way of capillary borings
65
,
65
a
extending through the slide bearing elements. Thus, the pressurized cavities
61
,
61
a
release through the capillary borings
65
,
65
a
a pressure fluid, particularly oil, into the oil pockets
64
,
64
a
for establishing an oil film between the slide bearing elements
114
,
114
a
and the inner surface
112
′ of the roll shell.
In the representation of
FIG. 3
, the first slide bearing element
114
acting in the loading direction is provided with an adjustment means
66
, comprising a bore
76
made in the body block
63
of the slide bearing element and movably fitted with a three-section slide valve
69
,
70
,
71
, including a middle slide-valve section
69
, a first end section
70
, and a second end section
71
. The slide-valve sections
69
,
70
,
71
are linked by a spindle rod
67
, which holds the slide-valve sections apart from each other and which spindle rod
67
abuts against a floor
62
of the cavity in the first slide bearing element
114
. The bore
76
has its bottom underneath the second slide-valve end section
71
fitted with a spring
68
, which stresses said spindle rod
67
against the cavity floor
62
. Hence, the adjustment means
66
is constituted by a valve, which is supplied with a pressure fluid through a central passage
120
a
and a supply passage
119
a
and which distributes the pressure and flow rate of the supplied pressure fluid at a desired and predetermined ratio through flow paths
72
and
73
defined by the slide-valve sections
69
,
70
,
71
of the adjustment means
66
, as well as through a connecting channel
118
a
and pressure passages
75
,
75
a
made in the body blocks
63
,
63
a
of the slide bearing elements
114
,
114
a
into the cavities
61
,
61
a
of the slide bearing elements. The bore
76
is further provided with an annular groove
74
at a confluence between the supply passage
119
a
and the bore
76
.
The roll shell
112
is capable of moving radially relative to the roll shaft
111
also in the direction of loading. In the case of
FIG. 3
, the roll shell
112
is depicted in a middle position, and from this middle position the roll shell
112
is allowed to travel a certain distance in either direction. For example, when dealing with the deflection compensated roll
110
of
FIG. 1
, which constitutes a nip with a counter roll, a suitable permissible stroke for the roll shell
112
is for instance 25 mm in either direction. Of course, this distance is only giv
Cuda Rosenbaum I
Metso Paper Inc.
Steinberg & Raskin, P.C.
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