JPH0246542A - Method and apparatus for calibrating measuring device in non-contact operation - Google Patents

Abstract

PURPOSE: To enable a calibrating process to be performed in a short time by providing a calibrator in a casing and moving the calibrator into the area of the light beam of a measuring head for measuring. CONSTITUTION: A tube body 2 is provided with two radial openings 6, 7 in each of the numerous places on the circumferential surface; through these openings, a measuring head 8 emits a measuring light beam 9 to the surface of a material 1 and also contains the reflected light beam 9. In moving a ring 14 working as a calibrator into the area of the measuring light beam 9, the casing 11 is slid in the axial direction by an actuating cylinder 15. As a result, the measuring light beam 9 hits the ring 14 whose outer diameter is accurately known. If this outer diameter is measured alike by the measuring head 8, or if it is different so that an adjustment is newly made, the calibrating position is returned with the cylinder 15 loaded correspondingly in the opposite direction, enabling the measurement to be resumed. Thus, the calibrating process can be performed in a short time.

Description

DETAILED DESCRIPTION OF THE INVENTION The invention relates to a method for calibrating a measuring device operating non-contactly under a measuring beam for the cross-sectional dimensions of a passing long material, in particular of a material to be rolled, and this method. The present invention relates to a measuring device for carrying out.

Such measuring devices are used not only to detect and monitor the finished dimensions, but also to determine the quality of the produced material, in particular its tolerance range, as well as to optimize the rearrangement of equipment and the use of time. It is also used for regulating and controlling production equipment, especially rolling lines. To achieve this, it is necessary to measure the cross-sectional dimensions of the material as accurately as possible during its passage, at one location or at multiple locations in the installation, to immediately recognize the differences that sometimes occur and to promptly initiate appropriate corrective actions. It is necessary to make it possible to do so. For carrying out such measurements, known measuring devices are used which operate non-contact, for example with laser radiation.

In practice, when using such a measuring device during work, the position of the zero point of the measured value changes unfavorably, which creates the disadvantage that unambiguous measurement results cannot be obtained. Such deviations in the zero point are usually caused by external influences and cannot be avoided in practice. The measuring head, which emits and receives the measuring beam of the measuring device, is located at a more or less radial distance from the material being used, depending on its construction, and surrounds the entire material or a part of it through which it passes. It is held in this position by a holding device or casing. When the temperature in the production hall or also in the vicinity of the housing changes, the housing expands or contracts, the position of the measuring head relative to the longitudinal solid axis of the material passing through it changes accordingly, and the zero point also shifts accordingly. Depending on the construction of the measuring device and the cross-sectional shape of the material to be measured, the measuring head is often arranged to pivot about or rotate about the longitudinal solid axis of the material. The vibrations and forces that arise in this case also cause the distance of the measuring head from the longitudinal solid axis of the material to change and, accordingly, the position of the zero point to change as well. Other uncontrollable external influences can also cause the zero point to shift, producing inaccurate measurement results.

The underlying problem of the invention is to create a method and a device with which accurate measurement results can be achieved.

This problem is solved according to the invention by keeping a calibration body with precisely known cross-sectional dimensions in the vicinity of the measuring position of the measuring device always ready for use, and at every stop in the measurement of the material or even after several stops in the measurement. This is achieved by moving the measurement beam into the area of the measuring beam and then adjusting the dimension representation or measured value representation of the measuring device to the known cross-sectional dimensions of the calibration body.

That is, whereas with conventional measuring devices a new adjustment of the zero point is always carried out during assembly and maintenance work carried out at large time intervals, the present invention does not require such a new adjustment. It is suggested that calibration be performed very frequently. How often this calibration is performed depends on the type of equipment and the mode of operation in which the measuring device is used. The fundamental point is that a particularly accurate measurement result is obtained by calibrating as often as possible, since any zero point deviations that occur are propagated to the next immediate calibration step. Gradual shifts in the zero point over a long period of time, which lead to increasingly large incorrect values, are prevented by repeated calibrations carried out briefly one after the other.

This calibration is performed by repeatedly measuring a calibration body whose cross-sectional dimensions are precisely known.

For this purpose, this calibrator is moved into the region of the measuring beam instead of the material. The device must then be operated in such a way that the measurement display and the measurement value display display the known dimensions of the calibration body. If this is not possible due to zero point deviations, the calibration devices provided in such measuring devices must be operated in such a way that the dimensions of the calibration body are displayed or written.

Although such a calibration step can be performed at every manufacturing downtime, it is also possible to perform this method of calibration while the material is constantly passing through, and of course the material measurements can be made during the short period of time during which the calibration is performed. Interrupted.

The invention also provides a non-contact method for measuring the cross-sectional dimensions of a long passing material, in particular of a rolled material, comprising at least one measuring head in a casing surrounding the passing material. It also relates to a measuring device for calibrating a working measuring device. In this case, a large number of measuring heads are provided distributed around the circumference, and these measuring heads can be arranged rotatably or swingably or stationary. Furthermore, it is possible to replace the casing with a suitable holding device. According to the invention, a calibration body with precisely known cross-sectional dimensions is provided in or in the vicinity of the casing, which is held by a holding device and, if desired, temporarily deflects the measuring beam of the measuring head. It is possible to move within the area. This allows the calibration process to be carried out quickly and with little effort, and can be repeated as often as desired. This is because this calibrator is simple and can be quickly moved coaxially to the longitudinal solid axis of the material into the region of the measuring beam and out of the region of the measuring beam again.

comprising a tube surrounding the material through which the holding device passes and having a radial opening for the measuring beam;
Advantageously, this tube carries on the outside an axially displaceable ring as a calibrator. This embodiment is particularly suitable for measuring heated materials, especially rolled materials in hot rolling lines. This is because the tube surrounding the material significantly reduces thermal stresses on the measuring head and the calibrator body. It is also possible to form the tube body into a double-walled structure so that it can be cooled by a coolant flowing through the tube body. In this embodiment of the invention, the ring serving as a calibrator is firmly connected to the tube of the holding device and is slidable therewith in the axial direction in the casing relative to this casing. . In order to move the calibrator into the area of the measuring beam, it is sufficient to slide the tube together with the calibrator in the axial direction. The same procedure is also used when separating the calibration body from the area of the measuring beam. This relocation can be done quickly and without problems. On the other hand, it is also possible to design the ring serving as calibrator to be slidable longitudinally on the tube of the holding device. In this embodiment, the tube is no longer slid;
Rather, a ring serving as a calibrator is slid axially before and after calibration.

In another embodiment according to the invention, the holding device has at least one pivotable lever, to which the calibrator is fixed, the calibrator being selectively attached to the material. It is held in the same position either in the area of the measuring beam or out of the area of this measuring beam.This embodiment is particularly suitable for carrying out the calibration step only while the passage of the substance is paused. In this case, it is also possible for the calibration body to have the respective desired cross-sectional dimensions of the material, in which case the calibration process is carried out directly on the cross-sectional dimensions to be measured of the material, so that a particularly precise calibration can be carried out. be exposed.

The invention will now be described in detail with reference to the embodiments illustrated in the accompanying drawings.

FIG. 1 shows a longitudinal section through a large material 1. In FIG. This material has a circular cross section. However, the material does not have to have a circular cross-section; this material 1 can have any arbitrary cross-section, be made of different materials, and even at high or low temperatures. It's okay. Material 1
is surrounded by a tube 2, only a portion of which is shown to simplify the drawing. This tube body 2 is double-walled and thus forms an annular chamber 3 which is obliquely formed at an angle of 1 degree relative to the material 1 on the inlet side and has an end wall 2a and an outlet. It is closed on the sides by end walls 2b extending perpendicular to the material 1. Cooling water is supplied to the annular chamber 3 via a water supply connection 4 . This cooling water is discharged again via the connection 5.

The tube 2 is provided with two radial openings 6.7 at various locations on its circumference, through which the measuring head 8 transmits the measuring beam 9 onto the surface of the material 1 and the reflected measuring beam 9. to be collected.

The measuring head 8 is held in the casing 11 by a holding device 1o. The casing 11 is equipped with a bearing 12, by means of which the casing can be rotated on the stationary tube 2, or alternatively can be caused to undergo an oscillating movement about the longitudinal solid axis 1a of the material 1. The drive mechanism required for this purpose is known and has therefore been omitted here.

The interior of the housing 11 is supplied with cooling air via the connection 13, which escapes via the radial openings 6.7.

On the outside of the tube 2, in the immediate vicinity of the radial opening 6.7, a ring 14 is provided which serves as a calibrator and is firmly connected to the tube 2. When the ring 14 serving as a calibrator is moved into the region of the measuring beam 9 for the purpose of calibration, it is only necessary to load the working cylinder 15, which is mounted on the outer wall of the housing 11, with pressurized medium. This causes the casing 11 to slide axially to the left in FIG. 2 relative to the tube body 2, so that the measuring beam 9 impinges on the ring 14, the outer diameter of which is precisely known.

This outer diameter is similarly measured by the measuring head 8 or, if different, a new adjustment is carried out so that the calibration position shown in FIG.
5 in a correspondingly opposite direction, so that the position illustrated in FIG. 1 is again reached and it is possible to continue the measurement again.

FIG. 3 shows that a plurality of measuring heads 8 are provided in the housing 11, with this embodiment a large number of measurements can be carried out simultaneously, thereby achieving a higher precision.

The embodiment according to FIG. 4 essentially corresponds to the embodiment illustrated in FIGS. 1 and 3, except that the ring I4 serves as a calibrator.
are disposed longitudinally slidably on the tube 2 and are moved into and out of the region of the measuring beam 9 by the actuating cylinder 16 . In this case, the casing 11 does not have to slide axially relative to the tube body 2. In the embodiment according to FIG. 4, the bearing 12 serves only for rotational or oscillating movements about the vertical solid axis 1a. If this rotational movement or rocking movement is not required, this bearing 12 may not be provided.

In the embodiment according to FIG. 5, the material 1 has left the tube 2, so that the material is free for the port 17, which in this embodiment serves as a calibrator. This bolt is provided coaxially with respect to the vertical solid axis of material 1,
Although this does not necessarily have to be the case, it has a cross-sectional dimension that is desired for material 1 and is normally measured when the measuring device is normal, and this also applies to the production line or processing line of material 1. It is.

The port 17 is replaceably secured to the holding device 18. This holding bag W1B is equipped with two levers 19, which are connected to a link portion 2 at their end portions.
o, so that the holding device is pivotable. By this method, the bolt 17 can be swung from the tube body 2 to the position shown by the dashed line. In this position neither the retaining device 18 nor the bolt 17 impedes the passage of material. However, when performing calibration work, the bolt 17 that acts as a calibration body
As soon as the material 1 has left the interior of the tube 2, it is again quickly swung into its calibrated position within the tube 2.

[Brief explanation of the drawing]

Figure 1 is a longitudinal cross-sectional view of the measuring device during the measurement process; Figure 2 is a vertical cross-sectional view of the measuring device according to Figure 1 while the calibration process is being performed; 4 is a longitudinal sectional view of another embodiment of the measuring device, and FIG. 5 is a longitudinal sectional view of the third embodiment of the measuring device. The symbols in the figure are: 1... Material, 2... Tube, 3... Annular chamber, 4...
・Water connection part, 5.13...Cooling water connection part, 6.7...
・Aperture, 8...Measuring head, 9...Measuring light beam, 10
．． 18... Holding device, 11... Casing, 12.
・Bearing, 1417 ・Ring, 15, ・Operation cylinder, ・Bolt, 19 ・Renomer

Claims (1)

[Claims] 1. In a method for calibrating a measuring device operating non-contactly under a measuring beam for the cross-sectional dimensions of a passing long material, in particular of a material to be rolled, the measurement of the measuring device a calibrator with precisely known cross-sectional dimensions in the vicinity of the position is always kept ready for use and is moved into the area of the measuring beam after each measurement pause of the material or during several measurement pauses; characterized in that the dimensional display or measurement value display of the measuring device is then adjusted to the known cross-sectional dimensions of the calibration body;
The above device. 2. an elongated material passing through, comprising at least one measuring head in a casing surrounding the material passing through;
In a measuring device for calibrating a measuring device operating non-contactly under a measuring beam, in particular for the cross-sectional dimensions of the material to be rolled, there is a precisely known sensor in, beside or in the vicinity of the casing (11). A calibration body (14, 17) is provided which is marked with the cross-sectional dimensions of Measuring device as described above, characterized in that it is configured to be movable in the area of the measuring beam (9). 3. The holding device comprises a tube body (2) surrounding the material (1) through which it passes and is provided with radial openings (6, 7) for the measuring beam (9); an axially slidable ring (14) with body (2) on the outside as a calibration body;
3. The measuring device according to claim 2, wherein the measuring device carries: 4. A ring (14) serving as a calibrator is firmly connected to the tube (2) of the holding device and together with this tube the casing (1).
4. The measuring device according to claim 3, wherein the measuring device is slidable in the axial direction within 1) relative to the casing. 5. Measuring device according to claim 3, characterized in that the ring (14) serving as a calibrator is configured to be slidable longitudinally on the tube (2) of the holding device. 6. The holding device (18) is provided with at least one swingable lever (19) on which the calibrator (17) is fixed, which lever (19) moves the calibrator (17) into the material (1).
3. Measuring device according to claim 2, wherein the measuring device is configured such that it can be held selectively in the region of the measuring beam (9) or outside this region in the same position as the measuring beam (9). 7. Measuring device according to claim 6, wherein the calibration body (17) has the respective desired cross-sectional dimensions of the material (1).