JPH0243570B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a roll spacing adjustment device in continuous casting equipment.

In continuous casting equipment, when a slab moves from the arc guide section 1 to the horizontal guide section 2 shown in Fig. 1,
In some cases, a partially solidified portion remains inside the slab in the horizontal guide portion 2. Such a case may occur when the quality of the product is improved by softening the secondary cooling of the slab in the circular guide section, or when continuous casting is performed by increasing the casting speed. As described above, the final solidification portion exists immediately after transitioning from the arcuate guide portion 1 to the horizontal guide portion 2, that is, at the pinch roll segment shown in section X in FIG. The segments in this part are shown in Figure 2. In Fig. 2, the slab moves in the direction of the arrow, but if the final solidification part exists within this segment 3 and the solidification point fluctuates back and forth within the length range of the segment 3, the inlet of the segment 3 An unbalanced load acts on the column 4 on the side. This is because on the inlet side of the segment, a bulging force due to static casting pressure acts due to the presence of a partially solidified part, whereas on the outlet side, the segment is completely solidified, so no bulging force acts on it, and as a result, as shown in Figure 2. The segment is distorted. At this time, the roll spacing changes before and after the solidification point of the slab, but fluctuations in the roll spacing beyond a certain level, especially in this vicinity, have a negative effect on the internal properties of the product, so changes in the roll spacing must be constantly monitored to prevent any inconvenience. It is necessary to control it so that it does not occur.

The present invention was made in view of such problems,
The purpose is to keep the roll spacing within a predetermined tolerance range, prevent large distortions of the segments, and improve product quality.

In order to achieve this objective, the roll spacing adjustment device for continuous casting equipment of the present invention connects two parallel frames above and below the pinch roll segment and each column at the four corners guides the movement of the upper frame. A balance cylinder device is provided so as to surround the upper frame, and the upper frame is configured to be movable relative to the lower frame via this balance cylinder device, and the balance cylinder devices located at the front and back are communicated in a closed circuit, and the upper frame is penetrated. The upper ends of the front and rear columns are connected by a clamp cylinder device, which is connected to the center of the upper frame.

Hereinafter, the present invention will be explained based on drawings showing an example of implementation. FIG. 3 shows a pinch roll segment of a horizontal guide immediately following the arc guide of a continuous casting facility. In the figure, 11 and 12 are both the upper and lower frames of the segment;
The lower end of each column 13 is supported on the lower frame 12,
The upper end of each column 13 passes through the upper frame 11. 14 and 15 are balance cylinder devices provided so as to surround the front and rear columns 13 and 13, and although not shown in the drawings, a balance cylinder device is similarly provided in the right (or left) column. Each of the balance cylinder devices 14 and 15 wraps around the column 13, and has an inner cylinder 16 whose lower end is fixed on the lower frame 12, and a flange 17 provided at an intermediate portion of the inner cylinder 16 in the vertical direction, which is in contact with the inner surface. The internal cylinder chamber is divided into upper and lower halves and consists of an outer cylinder 18 surrounding an inner cylinder 16, and a lower end leg 19 of the upper frame 11 is fixedly connected to the upper end of each outer cylinder 18. Also, this balance cylinder device 14,1
5, the inner cylinder 16 and the outer cylinder 18 have the same pressure receiving area, and furthermore, the upper chamber 14a of the cylinder device 14 and the lower chamber 15b of the cylinder device 15 are communicated with each other, so that the lower chamber 14b of the cylinder device 14 and the cylinder device 15 are connected to each other. The upper chambers 15a of the hydraulic circuits are connected to each other to form independent closed cycle hydraulic circuits. It is assumed that there is no oil leak in the closed circuit. By the way, in the drawing, 20 is a pinch roll provided on the upper frame 11 side, and 21 is a pinch roll provided on the lower frame 12 side. Although these pinch rolls 20 and 21 are shown only on the inlet side of the slab in the drawing, In reality, a plurality of them are provided between the slab and the outlet side. 22 is a flow rate adjustment valve connected to pump P; 23, 23 are check valves; 24 is a valve that is normally closed and opened during initial adjustment;
5 and 25 are relief valves connected to the tank T. Furthermore, although not shown in the drawings, the upper ends of the front and rear columns 13, 13 passing upward through the upper frame 11 are connected by a clamp cylinder device, and this clamp cylinder device is connected to the center of the upper frame 11 (point O). ing.

Now, from the pinch roll 21 to the pinch roll 2
When the unbalanced load W shown in Fig. 3 acts on 0,
In response to the moment centered on the O point, the drag force R
occurs in the front balance cylinder device 14.
The thrust of the balance cylinder device 14 corresponding to the drag force R is R = (P _A2 - P _A1 ) × C However, P _A1 is the upper chamber 1 of the balance cylinder device 14.
The internal pressure of 4a, P _A2 is also the internal pressure of lower chamber 14b, C
is the cylinder pressure receiving area. At the same time, a drag force is generated in the rear balance cylinder device 15 in the opposite direction to that of the front balance cylinder device 14, and the moment due to the unbalanced load is balanced by WL=Rl. This is the front and rear balance cylinder device 14,1
5 constitute a closed circuit as described above, and the front and rear balance cylinder devices 14 and 15 operate in opposite directions. Note that L is the distance between the center line passing through point O and the pinch roll 20, and l is the distance between the front and rear columns 13, 13 and the center line passing through point O. Next, when the upper frame 11 moves up and down parallel to the lower frame 12, the balance cylinder devices 14 and 15 operate simultaneously and move in parallel as P _A1 = P _B1 = P _A2 = P _B2 . At this time, R=O. still
P _B1 is the internal pressure of the upper chamber 15a of the balance cylinder device 15, and P _B2 is the internal pressure of the lower chamber 15b.

The roll spacing adjustment device in the continuous casting apparatus of the present invention can be implemented as described above, and even if an uneven load is generated on the column due to the solidification state of the slab, it balances the moment due to the uneven load as described above, and rolls the rolls. The spacing can be kept within a predetermined tolerance range, and large distortions of the segments can be prevented to improve product quality.

That is, even if the segment tends to tilt due to the bulging force, it is corrected by the balance cylinder device. Therefore, in the present invention, when the slab is automatically straightened during casting operation and the slab is pulled out, the clamp cylinder device can be used to insert the dummy bar and adjust the roll interval for pulling out.

It should be noted that the present invention can be applied not only to the pinch roll segment of the horizontal guide immediately following the aforementioned arcuate guide, but also to pinch roll segments at other positions.

[Brief explanation of the drawing]

Fig. 1 is a schematic diagram of continuous casting equipment, Fig. 2 is an enlarged view of the pinch roll segment of section X in Fig. 1 for explaining the conventional example, and Fig. 3 is a longitudinal cross-section showing an example of the implementation of the present invention. It is a diagram. 11...Top frame, 12...Bottom frame, 1
3... Column, 14, 15... Balance cylinder device, 14a, 15a... Upper chamber, 14b, 15b
... lower chamber, 16 ... inner cylinder, 17 ... flange, 1
8...Outer cylinder, 19...Legs, 20, 21...Pinch rolls.

Claims (1)

[Claims] 1 In continuous casting equipment, a balance cylinder device is provided to connect the two parallel frames above and below the pinch roll segment and wrap around each column at the four corners that guide the movement of the upper frame, and the upper frame is connected to the upper frame through this balance cylinder device. The clamp cylinder device is configured to be movable relative to the lower frame, communicates between the front and rear balance cylinder devices in a closed circuit, and connects the upper ends of the front and rear columns that penetrate the upper frame with a clamp cylinder device. A roll spacing adjustment device for continuous casting equipment, characterized in that it is connected to the center of an upper frame.