APPARATUS FOR COOLING A ROLL ON A ROLL STAND

DISPOSITIF DE REFROIDISSEMENT D'UN CYLINDRE DANS UNE CAGE DE LAMINOIR

English Abstract

The invention concerns an apparatus (1) for cooling a roll
(2) in a roll stand and provided with at least one spray beam (3)
supplied with a cooling medium, especially water, with spray nozzles
(4) for spraying cooling medium onto the surface of the roll (2),
and that extends generally parallel to a spray beam axis (5)
extending parallel to the roll axis (6). In order to be able to
adjust the spray beam for changed roll diameters, the invention
provides that the spray beam (3) is mounted directly or indirectly
on a lever (7) that can pivot around a rotation axis (8) that is
parallel to the roll axis (6), and the spray beam axis (5) and the
rotation axis (8) are spaced from each other.

French Abstract

L'invention concerne un dispositif (1) de refroidissement d'un cylindre (2) dans une cage de laminoir, comportant au moins une rampe de pulvérisation (3) alimentée en agent de refroidissement, notamment en eau, cette rampe de pulvérisation comportant des buses de pulvérisation (4) destinées à pulvériser l'agent de refroidissement sur la surface du cylindre (2) et s'étendant dans le sens d'un axe de rampe de pulvérisation (5) parallèle à l'axe du cylindre (6). L'invention vise à guider la rampe de pulvérisation de manière optimale en fonction de la variation du diamètre du cylindre. À cet effet, la rampe de pulvérisation (3) est disposée directement ou indirectement sur un levier (7) qui est monté pivotant autour d'un axe de rotation (8) parallèle à l'axe du cylindre (6), l'axe de la rampe de pulvérisation (5) et l'axe de rotation (8) se trouvant à une certaine distance l'un de l'autre.

Claims

Claims:
1. An apparatus (1) for cooling a roll (2) in a roll
frame, comprising at least one spray beam (3) supplied with a
cooling medium, that has spray nozzles (4) for spraying the cooling
medium onto the surface of the roll (2), and that extends generally
parallel to a spray beam axis (5) extending parallel to the roll
axis (6), characterized in that the at least one spray beam (3) is
mounted directly or indirectly on a lever (7) that is mounted for
pivotal movement about a lever rotation axis (8) extending parallel
to the roll axis (6) and the spray beam axis (5), the lever rotation
axis (8), the roll axis (6) and the spray beam axis (5) being spaced
from each other, and in that the at least one spray beam (3) is
moveable in a straight line in two spatial directions by pivoting
the lever (7), thereby providing for the adjustment of the position
of the spray beam (3) relative to the roll (2) to be cooled.
2. The apparatus according to claim 1, characterized in
that the lever (7) is connected with an actuator (9) at a location
offset from the lever rotation axis (8).
3. The apparatus according to claim 2, characterized in
that the lever (7) has first and second arms (10, 11), the at least
one spray beam (3) being mounted directly or indirectly on the first
arm (10) and whereby the actuator (9) being connected to the second
arm (11).
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4. The apparatus according to any one of claims 1 to 3,
characterized in that the at least one spray beam (3) is mounted on
the lever (7) indirectly via an intermediate lever (12), the
intermediate lever (12) being mounted so that it can be pivoted on
the lever (7) at an intermediate lever rotation axis (13) extending
parallel to the roll axis (6).
5. The apparatus according to claim 4, characterized in
that an additional actuator (14) is provided for pivoting the
intermediate lever (12) around the intermediate lever rotation axis
(13).
6. The apparatus according to claim 5, characterized in
that the additional actuator (14) is connected between the second
arm (11) and the intermediate lever (12).
7. The apparatus according to any one of claims 4 to 6,
characterized in that the spray beam (3) is fixedly mounted on the
intermediate lever (12).
8. The apparatus according to any one of claims 5 to 7,
characterized in that the intermediate lever rotation axis (13) is
located between the at least one spray beam (3) and a pivot axis of
the additional actuator (14) on the intermediate lever (12).
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9. The apparatus according to claims 2 and 5,
characterized in that the actuator (9) and the additional actuator
(14) are designed for establishing defined displacement paths.
10. The apparatus according to claim 9, characterized in
that the actuators (9, 14) are hydraulic piston-cylinder units.
-11-

Description

CA 02743220 2011-05-10
APPARATUS FOR COOLING A ROLL ON A ROLL STAND
The invention concerns an apparatus for cooling a roll in
a roll stand with at least one spray beam supplied with a cooling
medium, particularly with water, that has spray nozzles for
spraying cooling medium onto the surface of the roll, and that
extends generally parallel to a spray beam axis extending parallel
to the roll axis.
A cooling apparatus of this type has been described in
the prior art. EP 0 374 538 [US 4,912,955] discloses a cooling
apparatus designed for spraying water onto the rolls of the roll
stand, for which a spray beam is used. There, the problem is
recognized that the optimal position of the spray beam changes
depending on the rolls used, so that such is designed adjustable.
The spray beam is suspended such that it can be moved horizontally
and vertically in such a way that the roll can be cooled optimally.
A similar solution is shown in EP 0 542 640 [US
5,212,975]. Here too, a spray beam is provided for cooling a roll.
It can be rotated around the longitudinal axis of the spray beam
to adjust the position of the spray beam. In this way, optimal
spraying of the roll is achieved.
Additional solutions of cooling systems are described in
EP 1 399 276 [US 7,266,698], in EP 1 142 652 [US 6,459,000], in DE
34 19 261 [US 4,750,343], in DE 94 18 359, in DE 195 03 544 and in
US 5 460 023.
All these solutions have in common that either a complex
mechanism must be used to achieve spray beam adjustment that is
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stable, reliable and precise in difficult rolling-mill conditions,
which is associated with corresponding costs, or that the
adjustment possibilities of the spray beam are not sufficient to,
particularly for different roll diameters, always be able to obtain
the optimal spray beam positioning and alignment.
Therefore, the object of present invention is to develop
a cooling apparatus of the type described above further in such a
way that with a simple and stable design that can be realized in a
cost-effective manner, an optimal adjustment of the spray beam of
the cooling apparatus is made possible. Furthermore, it must
ensure in particular that after a change of rolls and the
associated changed roll diameter and/or change of the position of
the roll, the optimal spray beam position and alignment can always
be selected, in order to achieve an optimal cooling result.
This object is attained by the invention in that the
spray beam is mounted directly or indirectly on a lever that can
pivot about a rotation axis extending parallel to the roll axis and
the spray beam axis and the rotation axis are spaced from each
other.
Accordingly, the spray beam can be moved in a straight
line in two spatial directions by a pivoting motion of the lever,
and thus be adjusted relative to the roll to be cooled.
Thus, the lever is preferably connected to the actuator at
a location offset from the rotation axis. Preferably, the lever has
two arms, the spray beam being mounted directly or indirectly on the
first arm and the actuator being mounted on the second arm.
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The adjustment possibilities of the spray beam are
increased further by the following provisions: The spray beam can be
mounted indirectly on the main lever by an intermediate lever that
is mounted such that it can be pivoted around a rotation axis
extending parallel to the roll axis. For pivoting the intermediate
lever around its rotation axis, an additional actuator can be
mounted. The additional actuator is preferably operatively
connected between the second arm and the intermediate lever. The
spray beam can be fixedly connected with the intermediate lever.
The rotation axis of the intermediate lever is preferably located
between the spray beam and the point of application of the
additional actuator on the intermediate lever.
The actuators are preferably designed to create defined
displacement paths. Preferably, but not necessarily, the actuators
are hydraulic piston-cylinder systems.
As a result of the proposed solution it is possible to
achieve evened cooling of a roll, independent of roll diameter.
In particular, with it, the same coverage of the spray of
the individual spray nozzles can be maintained, so that the same
cooling effect is always attainable, specifically for different roll
diameters.
In the proposed solution, the spacings between nozzle and
roll or roll and coverage of the cooling medium spray are always
held constant as the result of simple and optimal readjustment of
the spray beam for various rolls or roll diameters.
In principle, hydraulic, pneumatic or electrically
operated actuators are usable as actuators, eccentric cam disks or
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articulated joints also being usable. There also exists the
possibility of using the proposed solution when parameters of the
cooling medium are changed in order to influence the cooling effect.
Thus, with the proposed embodiment, the same spacing of
the spray nozzles from the roll can always be selected and the
surface impinged upon by the spray nozzle can be held constant.
This way, the impact pressure and point of impact of the cooling
medium is held constant on the roll surface.
The spray beam can also be pivoted to achieve a vertical
change of the point of impact and thus a change in the cooling
effect. Pivoting of the spray beam for a targeted change of the
coverage of the spray is also possible.
The drawings show embodiments of the invention. Therein:
FIG. 1 is a side view of an apparatus for cooling a roll
of a roll stand, using a roll with a first diameter,
FIG. 2 is a side view of the same apparatus using a roll
with a second, smaller diameter,
FIG. 3 is a partial perspective cross-sectional view of
the cooling apparatus as in FIG. 1 or FIG. 2, for the upper roll of
the roll stand, as well as an alternatively designed cooling
apparatus for a lower roll,
FIG. 4 is a perspective view of the cooling apparatus of
FIG. 3 for the lower roll.
FIG. 1 schematically illustrates an apparatus 1 for
cooling a roll 2 of a roll stand (not shown). An important
component of the cooling apparatus is a spray beam 3 that is
supplied by a water line 15 with water sprayed in a manner known per
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se by nozzles 4 and onto the surface of the roll 2. The spray beam
3 is tubular and has an axis 5 extending parallel to a roll axis 6.
In order to be able to adapt the spray beam 3 optimally to
various diameters of roll or rolls 2, the spray beam is not
stationary, but is movable. To this end, a lever 7 is provided that
is mounted so that it can be pivoted around a fixed rotation axis 8.
The lever 7 has two arms 10 and 11. The spray beam 3 is mounted
indirectly via an intermediate lever 12 at the outer end of the
first arm 10. An actuator 9 of the linear type engages the second
arm 11. The actuator 9 is pivoted at its other end 16 at a
stationary point.
If the actuator 9 is operated, the lever 7 is pivoted
about its rotation axis 8, so that the end of the first arm 10 moves
the spray beam 3 around the rotation axis 8 in a circular arc and
readjusts its position. Accordingly, the spacing of the spray
nozzles 4 from the roll surface is changed. This effect can be
utilized in order to adjust the spray beam 3 for changing roll
diameters and to thus always maintain the same (optimal) cooling
conditions.
In addition, the spray beam 3 is also located in such a
way that its position can also be adjusted (especially rotated
around the spray beam axis 5). To this end, the already mentioned
intermediate level 12 is provided. The intermediate lever 12 is
used for the indirect mounting of the spray beam 3 at the end of the
first arm 10. The intermediate lever 12 is mounted on the end of
the first arm 10 of lever 7, i.e. it can pivot around a rotation
axis 13 relative to the first arm 10. The pivoting motion is
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controlled by a second actuator 14 that has one pivoted on the
intermediate lever 12 and another end pivoted on the second arm 11
of the lever 7.
By joint action of the two actuators 9 and 14, the spray
beam 3 consequently can be optimally adjusted with respect to its
horizontal and vertical position relative to roll 2, rotation of the
spray beam 3 around its spray beam axis 5 being superimposed on this
motion.
A comparison of FIGS. 1 and 2 shows how such a
readjustment takes place when it is important after a change of
rolls to place the spray beam 3 optimally in position. In FIG. 1, a
roll 3 is used that has a larger diameter than the roll 2 seen in
FIG. 2.
Accordingly, in FIG. 2 the lever 7 was pivoted through an
angle a by the actuator 9. As a result of a readjustment motion of
the second actuator 14, a correction of the vertical position of the
spray beam can be made.
In FIG. 3, a roll stand is shown which an upper roll 2 and
a lower roll 2' that works together with it is indicated, provided
with respective cooling apparatus 1 and 1'.
As can be seen, the two rolls 2 and 21, are provided with
different cooling apparatuses 1 and 1'. Apparatus 1 is used for the
upper roll 2, as described in FIGS. 1 and 2.
For the lower roll 2', the cooling apparatus 1' of simpler
design is used, as illustrated in somewhat more detail in FIG. 4.
According to it, the cooling apparatus 1' is also provided
with a spray beam 3' with spray nozzles 4', but here, however, the
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spray beam 3' is fixed directly to a lever 7'. The actuator 9'
engages the lever 7' in such a way that this lever 7' including the
respective spray beam 3' can be pivoted toward the roll 2' or away
from it.
In both solutions that were described B i.e. for
apparatus 1 and apparatus 1' B the same principle applies, namely,
that the spray beam 3 or 3' is mounted directly or indirectly on the
lever 7 or 7'. Here, the lever 7 or 7', is mounted so that it can
pivot around a rotation axis 8 that is parallel to the roll axis 6.
The spray beam axis 5 and the rotation axis 8 are spaced from each
other.
Among other things, the outcome of the cooling is
dependent on the cooling medium, its pressure, its temperature, its
quantity, the type of nozzle and orientation relative to the spray
beam and of course, also from the distance between the nozzle and
the roll or drum that is to be cooled, as well as the temperature of
the roll.
Accordingly, a different type of nozzle or a different
coverage can influence the cooling effect extending over the width
of the roll.
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Reference numbers:
1 Apparatus
1' Apparatus
2 Roll
2' Roll
3 Spray beam
3' Spray beam
4 Spray nozzle
4' Spray nozzle
Spray beam axis
6 Roll axis
7 Lever
7' Lever
8 Rotation axis
9 Actuator
9' Actuator
First arm
11 Second arm
12 Intermediate lever
13 Rotation axis
14 Actuator
Water line
16 End of actuator
a Angle
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Representative Drawing