JPS5947623B2 - Measuring device for roll displacement during continuous casting - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for measuring and monitoring roll displacement of a continuous casting machine during a continuous casting operation, and to an apparatus therefor.

It is well known that when a slab is cast by a continuous casting method, there is a close relationship between the internal quality of the slab and the slab guiding moving rolls (hereinafter simply referred to as rolls).

That is, if there is an irregularity in the roll spacing in a portion of the slab where an unsolidified portion exists, internal quality defects such as internal splitting, center cracking, or center segregation are likely to occur in the slab. Currently, however, in order to strictly control this roll spacing, this spacing is measured mechanically or manually when continuous casting operations are stopped, such as during periodic inspections or between castings, and rolls that are outside the control limit are measured. The above-mentioned quality defect is prevented from occurring by performing an operation to return this to within the control limit value.

With this control, there is theoretically no possibility that the above-mentioned quality defects will occur in the slab as long as steady operation is performed. However, in reality, the distance between the rolls changes from moment to moment due to the thermal load, mechanical load, or the condition of the rolls themselves, especially the bending of the rolls in the longitudinal direction, and the bending of the rolls mentioned above also changes as the operation progresses. Although the roll management described above is good in terms of trends, it is management that does not correspond to the operating situation.

In other words, when it comes to role management, there are problems with static management, and dynamic management that corresponds to the operational status is required. The dynamic roll management described above requires measurement and monitoring of roll displacement during casting, which has the following disadvantages.

In other words, when measuring and monitoring roll displacement, a measurement reference point is set at a location other than the roll to be measured, but since the measurement is being performed during manufacturing, the reference itself may be deformed due to the heat influence from the slab, resulting in large measurements. This will lead to errors, and even the slightest displacement cannot be used practically in terms of accuracy when measuring the displacement of the roll related to the white matter of the cast slab. As an example of resolving the above-mentioned drawbacks, it is possible to configure the reference point constituent members parallel to the longitudinal direction of the roll to be measured, so that the thermal influence on the reference point constituent members is absorbed in the longitudinal direction as well. .

However, with this method, since the roll length itself is quite long, the reference member is deflected and accurate measurements cannot be made (-O
To solve this problem of deflection, it is possible to make the reference member rigid, but the amount of warpage of the reference member becomes quite large due to uneven heat due to radiant heat from the hot slab during casting, making accurate measurement impossible. Cooling of the &L reference member may be considered as a countermeasure against this uneven heat, but it does not completely eliminate the uneven heat and similarly, accurate measurement cannot be performed. The present invention overcomes the above-mentioned drawbacks and makes it possible to effectively measure and monitor roll displacement during continuous casting.

That is, in the present invention, the displacement of the roll is measured using a thin wire material or a thin wire rope as a reference, which is placed parallel to or close to the longitudinal direction of the roll to be measured while applying tension in the longitudinal direction. Each of the above-mentioned drawbacks can be eliminated. Deflection due to thermal expansion (particularly in the longitudinal direction) and own weight is always absorbed by the tension applied in the longitudinal direction. Further, the warping caused by uneven heat from the slab can be ignored because the wire rods, wire ropes, etc. are thin, and since they have fairly free directionality, they can be absorbed by the tension that can be applied. Hereinafter, the present invention will be explained in detail based on embodiments and with reference to the drawings.

FIG. 1 shows an example of the invention.

In the figure, 1 indicates the roll of the continuous casting machine, and 2 indicates its frame. In the present invention, a wire rod or wire rope 3 is stretched between the frames, and a spring 4, for example, is interposed between the frame 2 and the wire rod or wire rope 3 so as to always give a certain tension to the wire rod or wire rope 3. let However, the wire rod or wire stretched between the frames with a certain tension applied thereto in this manner is used as a reference point for measuring roll displacement. A thin pipe 6 that is rotatable with respect to this measurement reference point is installed on the outside, and a contact T with the roll 1 is fixedly attached to one end of this pipe 6, and a detection end for roll displacement is attached to the other end of this pipe 6. 8 is provided, and furthermore, a detector 9 is arranged so as to be in constant contact with this detection end 8. In this example, the displacement of the roll is converted into the rotation of the pipe 6 and transmitted, and this is detected by the detector 9. That is, as shown in FIG. 3a, a differential transformer, for example, is used as the detector 9, and the signal from the differential transformer 9 is recorded on a recorder 9'. FIG. 3b shows an example of displacement recording. In this example, as shown schematically and enlarged in FIG. 2, the contact T contacts the roll 1 in the tangential direction, so even if the contact T expands and contracts due to the influence of heat, the reference point 3 and the contact point The distance to a is constant and its influence is minimal. Further, even if the pipe 6 is affected by heat, this can be avoided in the longitudinal direction along the reference point 3. The warping of the pipe 6 due to uneven heat is also minimized because the pipe 6 has a slightly larger diameter than the reference point 3. The examples shown in FIGS. 4 and 5 show still other examples.

In this example, a roll displacement measuring device can be installed and removed freely. In Fig. 4, 10 is a guide pipe;
It plays the role of mechanically protecting the measuring device and blocking radiant heat from the slurp during casting, as well as integrating the device in order to improve the maintainability of the device. The cross-sectional shape of this guide pipe can be arbitrarily selected, such as circular, square, or triangular. 3 indicates a wire, for example, which serves as a measurement reference point as in the previous example, and one end is connected to the guide pipe 10 through a mounting member 11,
The other end of the bolt 1 is supported via a nut 13 and a member 14 to a spring 4 for applying a constant tension to the bolt 1.
Attach to 2.

This spring 4 is provided on the guide pipe 10, so that even if the guide pipe 10 expands thermally or warps due to uneven heat, the reference point will not change.
A pipe 6 is attached to the wire 3, and bearings 15 are provided at both ends of the pipe so that the pipe is rotatable relative to the wire 3.

Reference numeral 16 denotes a cutout window for guiding the contact element T with the roll provided on the pipe 6 out of the guide pipe 10.

This movement of the contact T is transmitted as rotation of the pipe 6 to the detection end 8 which is also connected to the pipe 6. This detection end 8
is also led out of the pipe 10 from the notch IT of the guide pipe 10. When actually installing a measuring instrument with this configuration, as shown in FIG. Fit the guide pipe 10 of the measuring instrument. In this case, a key groove 19 is provided in the guide pipe 10 and one side of the receiving member 18 is attached to the guide pipe 10 including the key groove 19.
The cross-sectional shape is . By providing the keyway 19 that matches the receiving member 18 in this manner, the measuring instrument is stably installed while being fitted into the receiving member 18, and the relative positional relationship with the frame 2 is fixed. This measuring device is attached to the receiving member 18.
The detection end 8 is arranged so as to be in contact with the detector 9 in the fitted state. Furthermore, a weight 20 is attached to the contactor 7 itself so that the contactor T is always in contact with the roll 1. As described above, the displacement of the roll 1 is determined by the contactor 7,
The rotational motion is caused by the pipe 6 and the detection end 8, and is detected by the detector 9.

In this example, the fulcrum of the reference point 3 is the wire at the receiving member 18 position. In addition, in the example of FIG. 1 and FIG. 2, the branch C is the attachment position of the wire 3, respectively. In the examples shown in FIGS. 4 and 5, even if the guide pipe 10 bends due to its own weight or warps due to uneven heat of the slab during casting, the fulcrum of the reference point wire 3 does not change due to tension, so detection and measurement can be performed. It does not give any error to the value. In this case, the wire, wire rod, etc. can be moved freely in each direction at the installation point without being installed via a universal joint or the like. Furthermore, this fourth
The example shown in the figures and FIG. 5 is advantageous in the following points.

In other words, as shown in Fig. 6, during casting and in the early stages of casting, when the insertion tip of a roll without a spacer passes through the tummy bar, when the final slab passes, during abnormal operation, or when someone enters the roll group, the upper roll must be removed. The measuring instrument is lifted by a hydraulic cylinder 21 (not shown in FIG. 5), but at this time the measuring instrument is also lifted by a roll chock 22, so that it will not be damaged. After the dummy bar has passed the insertion tip, simply lowering the roll chock 22 causes the keyway 19 to return the measuring instrument to its original state in which measurement is possible. 23 in this figure 6,
23' is a mounting table for the lower roll chock 21. In the above explanation, the present invention was mainly applied to the soil roll, but of course it can also be applied to the lower roll, and is used at position B in FIG. 6.

As described above in detail, the present invention measures roll displacement using a wire or a wire to which a constant tension is applied as a reference point, so that roll displacement during continuous casting can be measured with high accuracy. In this way, the present invention greatly contributes to roll management during casting.

[Brief explanation of the drawing]

The drawings show an embodiment of the device of the present invention, FIG. 1 is an explanatory diagram of one embodiment, FIG. 2 is a diagram showing the state of contact of the contactor in FIG. 1 with the roll, and FIG. 3a is an illustration of the detector. Explanatory diagram, FIG. 3 1b is an example of displacement recording, FIG. 4 is a sectional view showing another example of the device of the present invention, FIG. 5 is a diagram showing the usage (measurement) situation of FIG. 4,
FIG. 6 is a view from A in FIG. 5. 1...Roll, 2...Frame, 3...Reference point (
Wire rope), 4...Spring, 5...Detector, 5'...Lead wire, 6...Pipe, 7...Contact, 8...Detection end, 9...Detection container, 10... guide pipe, 11... mounting member, 12... bolt,
13... Nut, 14... Member, 15 Bearing, 16
Notch window, 17... Notch portion, 18... Receiving member, 19.
...Keyway, 20...Weight, 21...Hydraulic cylinder, 22...Roll chock, 23.23/...
- Placing table, 24... slab.

Claims (1)

[Claims] 1 A wire or wire tensioned between the frames of the roll to be measured with an elastic body, a pipe rotatably sheathed around this wire or wire, a contact with the roll attached to this sheathed pipe, and the above-mentioned wire attached to the sheathed pipe. A device for measuring roll displacement during continuous casting, comprising a detection end that displaces in sync with the contact, and a detector that detects the displacement of this detection end.