JPS5834220B2 - Roll alignment measuring device for continuous casting machine roll group - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a roll alignment measuring device for a continuous casting machine roll group, which measures whether the roll group is on a predetermined curvature surface and measures the roll spacing in a continuous casting machine. .

Continuous casting machines, which have been widely used in recent years, are mainly composed of a mold called a secondary cooling body and a large number of roll groups called a secondary cooling body.

Among these, the alignment control of the roll group is an important item in the maintenance work of a continuous casting machine, and if the alignment control is not sufficient (this will result in not only variations in product dimensions but also a decline in slab quality).

However, regarding the roll alignment management of the roll group of the above-mentioned continuous casting machine, conventionally only the roll spacing was measured.

That is, in the early days, a worker entered the roll cavity to measure the roll spacing, but recently, the roll spacing has been mechanically measured using a roll spacing measuring device.

In this conventional measurement, the distance between each pair of upper and lower rolls can be accurately measured and a normal and required value l can be obtained.
Even if the relative positions of adjacent rolls do not fall within a predetermined curvature plane, this method has the disadvantage that this deviation cannot be detected.

If such a misaligned roll group is used, abnormal pressure will be applied to the slab at that location, and the slab will be forced to be straightened, resulting in internal defects, which is not preferable.

Furthermore, if the roll cavity is incorrect, it will naturally become impossible to obtain the appropriate slab dimensions.

Therefore, in order to solve the above-mentioned problems, it is not enough to measure the roll spacing alone; in addition to the roll spacing, it is also necessary to measure whether the roll group is on a predetermined curvature surface. .

The purpose of this invention is to continuously measure the relative position and spacing of the lower three rolls of the roll group of a continuous casting machine, thereby determining whether the roll group is on a predetermined curvature surface (or not). By measuring the distance between the rolls and the distance between the rolls, the group of rolls can be placed on a predetermined curvature surface, and the distance between the rolls can be maintained at an appropriate value to produce continuously cast slabs with excellent product dimensions and product quality. To provide a roll alignment measuring device for a continuous casting machine that is capable of measuring roll alignment of a continuous casting machine.

The feature of this invention is that in a group of rolls of a continuous casting machine, the measurement of whether the group of rolls is on a predetermined curvature surface is possible between any (i) roll and (i-1) before and after this roll.
This is done by continuously measuring the relative position of the roll and (i-)-1) roll, and the roll spacing is measured between any (i) roll and the (i) roll that forms a pair above and below with this (i) roll. r) At the point where it is done between rolls.

To further explain this based on the drawings, Fig. 1 shows the lower roll arrangement of the upper and lower roll groups of the continuous casting machine, and for a curvature surface S with a predetermined curvature radius R,
(1), ... (i-1), (i), (i+1).

...(n) Each roll has δ1. δi−1. δ
i.

δi+1. δ.

The amount of misalignment is indicated by the amount of misalignment.

In this state, the 0) roll and the (n+1) roll are taken as reference rolls (these are on a constant curvature surface S), and any (i) roll between them and the (i-
1) By measuring the relative position Ci between the roll and the (i+1) roll, the misalignment amount δ of each roll can be determined.

In order to measure this Ci, the radius of curvature R is
is the roll pitch Pi.

AB takes advantage of the fact that it is much larger than Pi+1.

Assume that CD and FG are parallel.

Therefore, we obtain the following relational expression.

Note that a, b, and C are constants determined by the curvature and roll pitch, and δi−1°δ and δi+1 are each (i
-1), (i), (i+1) are the amounts of roll misalignment.

Therefore, by solving n simultaneous equations with i = 1 = n, each misalignment amount δ can be obtained.

In this case, the relative positions Ci of the three rolls can be measured continuously.

In this way, it is possible to measure whether the roll group is on the predetermined curvature surface S, and to measure the roll interval between any (i) roll and the roll that forms a pair above and below this (i) roll. It can be done between.

Next, an example of a measuring device used directly to carry out the above-mentioned measuring method will be described.

FIG. 3 is a side view showing the entire measuring device that moves between the upper and lower roll groups of the continuous casting machine.

This measuring device has a frame 1 as shown in FIGS. 4 and 5, and to this frame 1 is fixed a connecting fitting 2 which can be connected to a dummy bar used at the start of continuous casting.

Depending on the mounting position of the device, such as between dummy bars or at the tip of the dummy bar, the connecting fitting 2 may have an appropriate mounting structure.

In the illustrated example, the connecting fittings 2 are provided on the front and rear frames 1 to be attached between the dummy bars.

Furthermore, guide wheels 3 are provided on the side frame 1' of the frame 1 so that the entire measuring device can move along a guide rail (as shown) that guides the dummy bar.

A pusher bar 4 is supported by the frame 1 via a suppression mechanism that applies a downward pressing force.

That is, this pusher bar 4 is formed with a guide groove 5, which fits into the protrusion 6 provided on the frame 1, and
It is designed to be able to slide against the surface.

The lower surfaces of both ends of the pusher bar 4 are formed with flat contact surfaces 4a and 4b with the (i-1) roll and (i+1) roll before and after any (i) roll.

A suppressing mechanism is interposed between the contact surfaces 4a and 4b and the frame 1 so that the contact surfaces 4a and 4b move while reliably contacting each roll surface.

In this embodiment, as shown in FIG. 6, a compression spring 7 interposed between the frame 1 and the pusher bar 4 is used as this suppression mechanism, but an elastic body such as rubber or a cylinder may also be used. can.

A roll distance measuring device 8 is installed in the center of the pusher bar 4.
Install.

That is, this roll distance measuring device 8 includes a downward roll distance measuring device 8a that can contact the (i) roll, and an upward roll that can contact the (r) roll that forms a pair above and below the (i) roll. It has a distance measuring device 8b.

Naturally, both must always be on the bolt-straight line l in the longitudinal direction of each roll, as shown in FIG.

For example, a differential transformer can be used as the roll distance measuring devices 8a, 8b.

To move the measuring device described above between roll groups, any (i) roll, (i-1) rolls before and after this roll, and (i)
+1) The relative positional relationship with the rolls is determined by bringing the measuring device 8a and the contact surfaces 4a and 4b into contact with each of the rolls.

The roll spacing can be measured using measuring instruments 8a and 8b for any (i) roll and its paired roll (r), respectively.
This is done through contact.

FIG. 9 shows a block diagram for correcting roll alignment and roll gap, respectively, based on the signals from the measuring devices 8a and 8b (changes in output voltage in the case of a differential transformer). Set management target values for roll alignment and roll gap, and find abnormalities using print data.

As is clear from the detailed description above, according to the present invention, it is possible to automatically and continuously measure whether the roll group of a continuous casting machine is on a predetermined curvature surface and measure the roll spacing. Therefore, it is possible to mechanically perform more appropriate roll alignment management, and it is possible to prevent variations in product dimensions and adverse effects on product quality due to improper roll position.

[Brief explanation of drawings]

Fig. 1 is an explanatory diagram showing the arrangement of the lower rolls of the upper and lower roll groups of the continuous casting machine, Fig. 2 is an explanatory diagram for measuring the relative positions of the three rolls, and Fig. 3 9 to 9 show embodiments of the present invention, FIG. 3 is a side explanatory view of a measuring device located between roll groups, FIG. 4 is a plan view of one side of the measuring device, and FIG. 6 is an enlarged vertical sectional view of the suppression mechanism; FIG. 7 is a sectional view taken along B-B of FIG. 4;
FIG. 8 is a sectional view taken along line CC in FIG. 4, and FIG. 9 is a block diagram for comparatively managing roll alignment and roll gaps. 1...Frame, 4...Pusher bar, 4a. 4b... Flat contact surface, 7... Pressing mechanism (spring), 8, 8a, 8b... Roll distance measuring device.

Claims (1)

[Claims] 1. A continuous casting machine has a frame movably arranged between the upper and lower roll groups, and this frame consists of a side frame having a guide ring and a front and rear frame having a series of dummy bar fittings, and a pusher bar supported by the frame. , a suppression mechanism that urges this pusher bar downward with respect to the frame, and a suppression mechanism formed on the lower surface of both ends of the pusher bar to contact the (i-1) roll and (i+1) roll before and after any (i) roll. a flat contact surface, a downward roll distance measuring device attached to the pusher bar and in contact with the (i) roll, and an upward facing roll distance measuring device in contact with the (r) roll that is paired with the (i) roll; A roll alignment measuring device for a continuous casting machine roll group, comprising: