Measuring touch probe, measuring system, method for laseroptical
determination of the height of a strand guide roller,
and use of the measuring system
Technical field
The present invention relates to a measuring touch probe that
is suitable for sampling a circumferential surface of a
cylindrical roller (for example, a roller in a strand guide of
a strand casting machine, or a roller in a roller bed of a
cold-rolling or hot-rolling mill or of a strip processing
installation). Sampling is understood to be the sensing of at
\ least one point by contacting, wherein a touch surface of the
j measuring touch probe contacts the point on the circumferential
j surface.
| Further, the invention relates to a measuring system that is
] suitable for laser-optical measurement of the height of a
j cylindrical roller.
I In addition, the invention relates to a method for laserj
optical determination of the actual height HActUai of a strand
i guide roller in a strand guide by means of a measuring system.
• The height of a strand guide roller is important for the
! trouble-free operation of a strand casting machine, since a
i
j partially solidified strand, in particular, can withstand only
j low levels of mechanical load. Excessive mechanical loads,
j e.g. due to an incorrectly adjusted strand guide roller, can
j result in unacceptably high bending stresses, which can result
I in cracks in the strand, or even in a breakout of the thin
{ strand shell.
i Finally, the invention relates to the use of the measuring
| system, as claimed in either one of claims 8 to 9, for i
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execution of the method as claimed in any one of claims 10 to
14.
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Prior art
It is known practice to level the rollers in a strand guide of
a strand casting machine (also termed strand guide rollers) on
a so-called leveling stand. Typically in this case, a part of
the strand guide, e.g. the inner or outer frame of a strand
guide segment, is clamped on the leveling stand, and the actual
distance of the strand guide rollers in relation to a steel i
rule is determined by measuring means, e.g. by a strand :
micrometer. From the installation geometry of the strand '•
guide, it is possible to define the setpoint distances between the rule and the rollers, such that the height of the strand •
guide rollers can be adjusted exactly, e.g. by shims. Owing to
the bending of the steel rule, the determination of the heights
of the strand guide rollers is imprecise and, owing to the
large number of manual measurements, it is very time-consuming.
A further disadvantage consists in that the heights are not
sensed and recorded automatically.
Although the laser-optical leveling of an object by means of a '
measuring touch probe is known in principle from the technical
field of metrology, the existing, rigidly realized measuring
touch probes are nevertheless unsuitable for accurately and I
rapidly determining the actual height, owing to the relatively j
large height differences between differing rollers of a curved f
strand guide segment.
Summary of the invention
It is the object of the invention to overcome the disadvantages
of the prior art, and to describe a method for determining the ]
actual height of a strand guide roller in a strand guide, by
means of which measuring touch probe and method the actual
height of the strand guide roller can be determined
rapidly, i.e. within a short time for the measurement ;
and evaluation,
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with means that are as simple as possible,
without elaborate evaluation, and with a high degree of accuracy. This object is achieved by a measuring touch probe for sampling
a circumferential surface of a cylindrical roller, having
at least one touch probe comprising a touch surface; i
a vertical guide profile that is rigidly connected to the touch probe;
a laser receiving unit comprising a detector, field and a distance evaluation unit, wherein the laser receiving unit is i
displaceable in a vertical direction on the guide profile, the
detector field is realized for detecting a laser beam, and the
distance evaluation unit can determine a first vertical I
distance VAi of the laser beam in relation to the laser receiving unit; and
a displacement measuring device for determining a second vertical distance VA2 between the touch probe and the ;
laser receiving unit. <
In this case, a point on the circumferential surface of the cylindrical roller can be sampled by at least one touch probe comprising a touch surface. From the one point, or possibly also the plurality of points, on the circumferential surface, possibly taking account of the geometry (e.g. on the basis of 1
the known roller diameter), it is possible to deduce the height of the roller. The touch probe itself is rigidly connected to
a vertical guide profile of the measuring touch probe, wherein the guide profile can have, for example, a round or polygonal profile. The measuring touch probe has a laser receiving unit comprising a detector field, wherein the detector field is realized to sense the height of a laser beam. The laser
receiving unit in this case is displaceable on the guide ;
profile, such that heights greater than the longitudinal '
extension of the detector field can be sensed. The detector
field mostly comprises a plurality of discrete detectors, which ;
41
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are arranged, for example, in a column or in a matrix
comprising a plurality
41
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of columns. The detector field itself is connected to a
distance evaluation unit, wherein the latter can determine the first vertical distance of the laser beam in relation to the
laser receiving unit. Since the distance of the laser
receiving unit in relation to the touch probe can be determined ^
by means of a displacement measuring device, the second vertical distance of the laser beam from the touch probe is thus also fully determined. The displacement measuring device •
in this case can be integrated, for example, in the guide
profile, or be arranged outside of the guide profile. All I
contacting displacement measuring devices (e.g. potentiometer) or displacement measuring devices that operate without contact (e.g. a magnetostrictive, inductive, capacitive or optical i
displacement measuring device) can be used for displacement measurement. ;
In order to ensure the accuracy of the measuring touch probe I
over a prolonged period of use, it is advantageous for the
touch probe to be realized so as to be exchangeable.
In order to keep the measuring touch probe relatively simple,
robust and light, it is advantageous for the measuring touch
probe to have a communication module for connection by
information technology means to an evaluation unit, wherein the >
communication module is connected to the displacement measuring )
device and to the distance evaluation unit. As a result, the I
data from the measuring touch probe are transmitted by I
information technology means (e.g. by wire or wirelessly) to
the evaluation unit, e.g. to a PC, wherein the evaluation unit
determines the height of the roller and, if necessary, t
calculates a setpoint/actual deviation of the height. For i
example, the communication module is realized as a Bluetooth or f
WLAN interface. <
Alternatively, it is likewise possible for the measuring touch probe to have an evaluation unit, wherein the evaluation unit ;
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is connected to the displacement measuring device and the
distance evaluation unit. In this case, the evaluation unit is ,
realized, for example, as a microcontroller, which is
integrated into the measuring touch probe. It is possible in
this case for the measuring touch probe also ;
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to have an indicator unit (e.g. a display), such that the i
height can not only be evaluated on the measuring touch probe,
but also output thereon. i
For the purpose of initiating a measurement, it is expedient for an operating control to be connected to the communication I
module or to the evaluation unit by signal technology means. Simple operation is possible if the operating control is t
arranged on the measuring touch probe. It is possible for the measuring touch probe to be reliably j
placed onto a strand guide roller if a touch probe is in each case arranged on a limb, wherein two limbs enclose an angle 45° < a < 135°. If the geometry of the measuring touch probe, the
diameter of the roller and the distance between the touch probe
and the laser receiving unit are known, the height of the
strand guide roller can easily be determined.
Placing can be achieved in a particularly simple manner if the
measuring touch probe has at least three touch probes, wherein
two touch probes are arranged in a first plane and one touch
probe is arranged in a second plane, and the first plane is ,
aligned parallel to the second plane. This can be effected, |
for example, in that two limbs are arranged in series in each case, such that the laser receiving device is arranged parallel i
to the first and the second plane, i.e. in a plane normal to J
the longitudinal axis of the roller. A defined line contact or point contact between the touch probe f
and the circumferential surface can be ensured if the touch surface has a curved, in particular a cylindrical or spherical, I
contour. !
In order to prevent an unwanted displacement of the laser '
receiving unit after the measuring touch probe has been placed i
on, it is advantageous for the measuring touch probe to have a I
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locking device (e.g. a clamping device or a fixing screw), for :
fixing the position of the laser receiving unit in relation to the J
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guide profile, or to have a damper. The damper (e.g. a gas
pressurized damper) is arranged, for example, between the guide :
profile and the laser receiving unit, such that it is possible
to prevent an unwanted displacement of the laser receiving unit
resulting from the force of gravity of the laser receiving
unit. It is advantageous if a measuring system has ;
a laser;
a measuring touch probe; }
an evaluation unit, which is connected to the '
measuring touch probe by information technology means; and ;
an output unit, for outputting the height of the roller. As already stated above, the evaluation unit, and possibly also ;
the output unit, can either be structurally separate or
integrated into the measuring touch probe.
Preferably, the laser is realized as rotary laser, wherein the rotating rotary laser spans a light plane. A measuring touch ;
probe can thus be set to differing positions without the
necessity of realigning the laser. To enable the position of the measuring touch probe to-be
sensed, it is advantageous for the measuring system to comprise
a transmitter and for the measuring touch probe to comprise a :
receiver of the position measuring system, wherein the receiver j
is connected to the communication module or to the evaluation unit by signal technology means, such that the position of the j
measuring touch probe can be determined. The position measuring system can be, for example, an active RFID measuring system, UWB system, WLAN system, infrared or ultrasound
measuring system, but also a GPS or a so-called "differential
GPS" measuring system. The position of the measuring touch ;
probe can be used for automated comparison of the actual height
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HActuai of the roller with a possibly position-dependent setpoint
height HSetpoint/ such that the evaluation unit can automatically
determine a deviation A between a setpoint height HSetpoxnt and
the actual height HActUai- ;
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Further, (position-dependent) recording of the heights is made
possible. The setpoint position and the actual height of the
strand guide roller define a cubic, or rectangular, setpoint
control volume, in which the strand guide roller must be
located. In addition to the deviation of the actual height j
from the setpoint height, therefore, it is also possible, if
necessary, to determine the deviation of the actual control !
volume from the setpoint control volume (e.g. from the distance of the spatial centers of gravity of the control volume). The actual control volume is obtained from the actual position and
the actual height, with measurement tolerances being taken into account.
The object according to the invention is likewise achieved by a method for laser-optical determination of an actual height of a {
strand guide roller in a strand guide by means of a measuring system, comprising a laser, a measuring touch probe, as claimed I
I
in any one of claims 1 to 7, that comprises laser receiving device, a detector field, a distance evaluation unit, a touch j
probe and a touch surface, and an evaluation unit, which is connected to the measuring touch probe by information {
technology means, comprising the following method steps: }
positioning the laser; switching on the laser; sampling the strand guide roller by means of the ''
measuring touch probe, wherein at least one touch surface of
the measuring touch probe contacts a point on the
circumferential surface of the strand guide roller and a laser
beam intersects the detector field;
initiating a measurement;
determining a first vertical distance VAi between the [
laser beam and the laser receiving unit, by means of the I
distance evaluation unit, and a second vertical distance V7A2 between the touch probe and the laser receiving unit, by means
of the displacement measuring device;
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calculating the actual height HActuai of the strand
guide roller, with HActuaj = VAi + VA2, in the evaluation unit.
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Preferably, the laser executes a rotary motion, wherein the
laser spans a light plane.
It is advantageous, after the step "initiating a measurement",
for
the position of the measuring touch probe to be
determined by a receiver of a position measuring system;
the position of the measuring touch probe to be i
transmitted to the evaluation unit; (
the evaluation unit to determine a difference A l
between a setpoint height HSetpoint and the actual height HActUai/ r
and !
the difference A to be output by an output unit. j
Frequently, in measurement of a strand guide roller, a setpoint I
height HSetpoint is assigned to a position of the measuring touch I
probe.
It is expedient for the setpoint height HSetPoint to be derived
from CAD data.
It is advantageous for the setpoint height HSetpoint/- the actual height HActuai and the difference A to be recorded in a
measurement record.
For a highly precise measurement, it is advantageous, in the
step "positioning the laser", for the laser to be rigidly (but removably) connected to a stationary frame of the strand guide I
or to the base. The laser thus concomitantly undergoes the i
same displacements, or vibrations, as the strand guide, such that these do not negatively affect the accuracy. It is advantageous for the measuring system as claimed in I
either one of claims 8 to 9 to be used for execution of the
method as claimed in any one of claims 10 to 14.
m
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Brief description of the drawings
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Further advantages and features of the present invention are
given by the following description of non-limiting exemplary •
embodiments, wherein reference is made to the following figures, which show the following: ;
Fig. 1 a sectional representation of a first embodiment of a j
measuring touch probe j
Fig. 2 a non-sectional representation of the measuring touch i
probe according to Fig. 1 Fig. 3 a second embodiment of a measuring touch probe having two limbs !
Fig. 4 a third embodiment of a measuring touch probe
Fig. 5 a fourth embodiment of a measuring touch probe
Fig. 6 a representation of the determination, according to the invention, of the height of a strand guide roller
Fig. 7 the representation of the determination, according to
the invention, of the height for three strand guide rollers Fig. 8 a representation of the determination of the height of a strand guide roller according to the prior art i
Description of the embodiments
Fig. 1, in a sectional representation, shows a first embodiment J
of the measuring touch probe 1. The circumferential surface of a cylindrical roller, not represented, can be sampled by means of the measuring touch probe 1, wherein a spherical touch
surface 3 of the touch probe 2 contacts the circumferential }
surface. The touch probe 2 is connected to a round guide '•
profile 4, wherein the laser receiving unit 5 can •
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be displaced vertically in relation to the guide profile 4 and
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longitudinal axis of the guide profile 4 (direction of displacement represented as an arrow). For the purpose of [
guiding with an absence of play, the guide profile has a ground surface, and the laser receiving unit 5 has an annular bushing. j
The distance between the laser receiving unit 5 and the touch probe 2 can be determined by a displacement measuring device 9, j
which is realized as a potentiometer. As an alternative to the potentiometer, the displacement measuring device could also be J
realized as an LVDT measuring device, a magnetostrictive measuring device or as a measuring rule having an electrical interface. Arranged between the guide profile 4 and the
housing of the laser receiving unit 5 there is a compression
spring, which defines the neutral position of the measuring
touch probe and ensures a defined contact between the touch
surface 3 and the roller.
Fig. 2 shows the detector field 6 of the laser receiving device
5, and a laser beam 8, or a light plane 35. The distance
evaluation unit 7, which is arranged, as an electronic circuit, at the upper end of the laser receiving device 5, is connected {
to the detector field 6, wherein the distance evaluation unit 7 |
can determine the first vertical distance VAi of the laser beam |"
8 from the laser receiving unit 5. Therefore, since the second f
i
vertical distance VA2 between the touch probe 2 and the laser |
receiving unit 5 are known from the displacement measuring device 9, and the vertical distance VAi between the laser i
receiving unit 5 and the laser beam 8 are known from the distance evaluation unit 7, an evaluation unit on the measuring I
touch probe 1 can determine the actual height H = VA^+VA2 of the
strand guide roller, i.e. the distance between the laser beam j
8, 35 and the touch surface (specifically, the top edge of the j;
strand guide roller) . In order to make the operation of the measuring touch probe 1 more ergonomic, an operating control 12 is arranged on the measuring touch probe. After the operating }
control 12 has been pressed, the vertical distances VAi and VA2 I
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are determined and the actual height HflctUai is calculated in the
evaluation unit. The actual height is then transmitted to an
indicator
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unit - structurally separate from the measuring touch probe 1 -
by means of a communication module, which is realized as a
Bluetooth interface. . ;
Fig. 3 shows a second embodiment of the measuring touch probe 5
1, which has two touch probes 2, realized as limbs 13. The two
limbs 13 enclose an angle a = 90°, such that the two touch surfaces 3 of the limbs 13 contact the circumferential surface |
of a cylindrical roller simultaneously. From the geometry of ;
the limbs 13, and with knowledge of the diameter of the strand S
guide roller, therefore, it is again possible to determine the j
height of the strand guide roller. In addition, the measuring f
touch probe 1 has a receiver 14 of a so-called "differential j
GPS", such that the position of the measuring touch probe in a hall can be determined during the sampling of strand guide I
rollers. Setpoint heights HSetpo±nt corresponding to differing I
positions of the measuring touch probe can thus be stored, such j
that the evaluation unit can determine the deviation A = HSetpoint
- HActUai in each case. In the case of this embodiment, the i
displacement measuring device is integrated into the laser "
receiving device 5, as in Fig. 1. I
Fig. 4 shows a third embodiment of a measuring touch probe 1,
wherein, however, unlike Fig. 3, the displacement measuring i
device 9 is arranged outside of the laser receiving device 5. In this case, the displacement measuring device is realized as ?
a so-called magnetostrictive displacement measuring system that \.
operates without contact (see Balluff "Micropulse") . ,'
Fig. 5 shows a fourth embodiment of a measuring touch probe 1. j
Unlike Fig. 4, the measuring touch probe has two parallel guide *
profiles 4, such that the laser receiving unit 5 is secured •
against rotation in relation to the limbs 13. i
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Fig. 6 shows a measuring system that is used for determining the height of a strand guide roller 20. Firstly, a rotary laser 31 is positioned on a stand close to the strand guide }
roller 20, such that the laser, when switched on, produces a horizontal light plane 35 as a result of a rotary motion 34.
The strand guide roller 20 is then sampled by means of the
measuring touch probe 1, such that the touch surfaces 3 of the
two touch probes 2 realized as limbs 13 contact the
circumferential surface 21 of the strand guide roller 20. The
laser receiving unit 5 is then displaced in a vertical
direction on the circular guide profile 4 in such a way that
the laser beam 8 of the light plane 35 intersects the detector
field 6. After the displacement, the vertical position of the
laser receiving device is locked by a clamping, or locking,
device that acts between the laser receiving device and the [
guide profile, such that the force of gravity does not result t
in lowering of the laser receiving device 5. A measurement is 5
then initiated, in that an operating control 12 on the i
measuring device 1 is pressed. After initiation of the
measurement, a distance evaluation unit in the measuring touch probe 1 determines a first vertical distance VAi between the laser beam 8 and the lower edge of the laser receiving unit 5.
A displacement measuring device determines the second vertical distance VA2 between the touch probe 2 and the lower edge of •'
the laser receiving unit 5. The actual height of the strand
guide roller 20 is therefore determined, however, by HActual =
VAj + VA2, wherein the actual height is calculated in an
evaluation unit located spatially inside the laser receiving :
device 5, and is displayed by the output unit 32.
In the adjustment of the laser, the procedure may be, for
example, as follows: Firstly, the laser is fixed. Then, the
position of the typically four reference support points of the
segment - those points where the segment is supported on the
stand - is determined by measuring means, wherein initially all
four points are measured. From the four points, a reference :
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measurement plane is determined, wherein one point (e.g. the I
so-called fourth point, since, as is known, three points span a j
I
plane) is adapted to the reference measurement plane, if j
necessary, by "shimming". If necessary, in the actual j
measuring of the heights, a second laser receiver is used, l
which ensures the - not necessarily horizontal - alignment of S
the laser plane. f
Fig. 7 shows the determination of the actual heights for three strand guide rollers 20, wherein the rollers are located at differing levels. It can be seen in this case that the laser {
receiving unit 5 must be displaced vertically on the guide
profile 4 in each case in order for the laser beam 8, 35 to
intersect the detector field 6. In relation to the middle
representation, the laser receiving unit 5 in the
representation on the left has been displaced downward, and
displaced upward in the representation on the right. In the
case of the representations on the right and on the left, an
undisplaced position of the laser receiving unit 5, in relation I
to the central representation, is indicated by a broken line. {
An advantage of the continuous displaceability of the laser receiving device 5 is that a large vertical height range can be |.
covered by means of one measuring touch probe. In addition, f
there is no need to adapt a rigid measuring touch probe to |
differing heights by means of connectable or screw-on adapter r
plates or adapter rods.
Clearly, it is particularly advantageous if the measuring touch
probe 1 has a receiver of a position measuring system, e.g. a "differential GPS" receiver, such that setpoint heights HSetpoint are assigned to differing positions of strand guide rollers in each case. The evaluation unit on the measuring touch probe
can thus already determine a deviation A = HSetpoint - HActUai and ?
output it directly on an output unit on the measuring touch I
probe. i
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Fig. 8 shows the determination of the actual height HActUai of a i
strand guide roller 20 by means of a strand micrometer. J
4
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In the course of servicing a strand casting installation or a I
roller bed in a cold-rolling or hot-rolling mill, it is advantageous to use the measuring touch probe according to the I
invention, or the measuring system according to the invention, I
or to apply the method according to the invention in the I
servicing work. Although the invention has been illustrated and described in :"
greater detail on the basis of the preferred exemplary
embodiments, the invention is not limited by the disclosed
examples, and other variations can be derived therefrom by
persons skilled in the art, without departure from the I
protective scope of the invention. • 11183450.3 - 15 -
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List of references '•
1 measuring touch probe !
2 touch probe 3 touch surface j
4 guide profile j
5 laser receiving unit j
6 detector field I
8 laser beam 9 displacement measuring device 11 communication module >
12 operating control I
13 limb }
14 receiver of the position measuring system j
15 locking device {
20 strand guide roller
21 circumferential surface I
30 evaluation unit
31 rotary laser
32 output unit
33 transmitter
34 rotary motion
35 light plane
40 strand guide segment
41 frame
VAi first vertical distance
VA2 second vertical distance
a angle

Claims
1. A measuring touch probe (1) for sampling a circumferential
surface (21) of a cylindrical roller (20), having
at least one touch probe (2) comprising a touch
surface (3);
a vertical guide profile (4) that is rigidly connected
to the touch probe (2);
a laser receiving unit (5) comprising a detector field
(6) and a distance evaluation unit (7), wherein the laser
receiving unit (5) is displaceable in a vertical direction on
the guide profile (4), the detector field (6) is realized for
detecting a laser beam (8), and the distance evaluation unit
(7) can determine a first vertical distance VAi of the laser
beam (8) in relation to the laser receiving unit (5); and
a displacement measuring device (9) for determining a
second vertical distance VA2 between the touch probe (2) and
the laser receiving unit (5).
2. The measuring touch probe as claimed in claim 1,
characterized in that the measuring touch probe (1) has a
communication module (11) for connection by information
technology means to an evaluation unit (30), wherein the
communication module (11) is connected to the displacement
measuring device (9) and to the distance evaluation unit (7).
3. The measuring touch probe as claimed in claim 1,
characterized in that the measuring touch probe (1) has an
evaluation unit (30), wherein the evaluation unit (30) is
connected to the displacement measuring device (9) and the
distance evaluation unit (7).
4. The measuring touch probe as claimed in either one of
claims 2 or 3, characterized in that an operating control (12)
is connected to the communication module (11) or to the
evaluation unit (30) by signal technology means, wherein the
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operating control (12) is preferably arranged on the measuring
touch probe (1).
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5. The measuring touch probe as claimed in claim 1,
characterized in that a touch probe (2) is in each case
arranged on a limb (13) of the measuring touch probe (1),
wherein two limbs (13) enclose an angle 45° < a < 135°.
6. The measuring touch probe as claimed in claim 5,
characterized in that the measuring touch probe has at least
three touch probes, wherein two touch probes are arranged in a
first plane and one touch probe is arranged in a second plane,
and the first plane is aligned parallel to the second plane.
7. The measuring touch probe as claimed in claim 1,
characterized in that the measuring touch probe (1) has a
locking device (15) for fixing the position of the laser
receiving unit (5) in relation to the guide profile (4), or has
a damper.
8. A measuring system for laser-optical measurement of a
height of a cylindrical roller (20), having
a laser (31);
a measuring touch probe (1) as claimed in any one of
claims 1 to 7;
an evaluation unit (30), which is connected, to the
measuring touch probe (1) by information technology means; and
an output unit (32), for outputting the height of the
roller (20).
9. The measuring system as claimed in claim 8, characterized
in that the measuring system comprises a transmitter (33) and
the measuring touch probe (1) comprises a receiver (14) of a
position measuring system, wherein the receiver (14) is
connected to the communication module (11) or to the evaluation
unit (30) by signal technology means, such that the position of
the measuring touch probe (1) can be determined.
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10. A method for laser-optical determination of an actual
height HActuai of a strand guide roller (20) in a strand guide by
means of a measuring system, comprising a laser (31), a
measuring touch probe (1), as claimed in any one of claims 1 to
7, that comprises a laser receiving device (5) , a detector
field (6), a distance evaluation unit (7), a touch probe (2)
and
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a touch surface (3), and an evaluation unit (30), which is
connected to the measuring touch probe (1) by information
technology means, comprising the following method steps:
positioning the laser (31);
switching on the laser (31);
sampling the strand guide roller (20) by means of the
measuring touch probe (1), wherein at least one touch surface
(3) of the measuring touch probe (1) contacts a point on the
circumferential surface (21) of the strand guide roller (20)
and a laser beam (35) intersects the detector field (6);
initiating a measurement;
determining a first vertical distance VAi between the
laser beam (35) and the laser receiving unit (5), by means of
the distance evaluation unit (7), and a second vertical
distance VA2 between the touch probe (2) and the laser
receiving unit (5), by means of the displacement measuring
device (9) ;
calculating the actual height HActuai of the strand
guide roller, with HActuai = VAi + VA2, in the evaluation unit
(30) .
11. The method as claimed in claim 10, characterized in that,
after the step "initiating a measurement",
the position of the measuring touch probe (1) is
determined by a receiver of a position measuring system (14);
the position of the measuring touch probe (1) is
transmitted to the evaluation unit (30);
the evaluation unit (30) determines a difference A=
Hsetpoint - HActuai between a setpoint height Hsetpoint and the actual
height HActuai; and
the difference A is output by an output unit (32).
12. The method as claimed in claim 10, characterized in that
the setpoint height Hsetpoint is derived from CAD data.
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13. The method as claimed in claim 11, characterized in that
the setpoint height Hsetpoint^ the actual height Hflctuai and the
difference A are recorded in a measurement record.
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14. The method as claimed in claim 10, characterized in that,
in the step "positioning the laser", the laser (31) is rigidly
connected to a stationary frame (41) of the strand guide (40)
or to a base.
15. The use of the measuring system as claimed in either one
of claims 8 to 9 for execution of the method as claimed in any
one of claims 10 to 14.