JPH0456707B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION FIELD OF INDUSTRIAL APPLICATION The present invention relates to a roll segment in continuous casting equipment whose roll spacing can be changed arbitrarily during casting.

Prior Art An example of a conventional roll segment in continuous casting equipment is shown in FIG. 1 is an upper frame which rotatably supports an upper roll 2 on the lower surface side;
1 is a lower frame, which faces the upper frame 1 and rotatably supports a lower roll 4 on its upper surface side.
Reference numeral 5 denotes a column whose lower end is fixed to the four corners of the lower frame 3 and whose upper part penetrates the upper frame 1 and projects upward. 7 is a servo type hydraulic cylinder, and the main body 7 is located on the left and right of the segment.
A is attached to the center of a connecting member 6 that connects the upper ends of the columns 5, 5 on the inlet and outlet sides in the direction of progress of the slab (arrow M), and the piston rod 7
b is connected to the upper frame 1. 8 is a pin joint, and 9 is a sliding bush.

In the roll segment described above, the distance between the upper and lower rolls 2, 4 is controlled by left and right servo hydraulic cylinders 7, 7.

Problems to be Solved by the Invention In the conventional roll segment described above, the position of the upper roll 2, that is, the position of the upper and lower rolls 2, 4 is controlled by a pair of left and right servo hydraulic cylinders 7, 7 (total of 2) perpendicular to the casting direction. It is possible to accurately adjust the roll spacing in the direction perpendicular to the casting direction (M), but it is impossible to accurately control the roll spacing on the entry and exit sides in the casting direction. There was a problem. In other words, since the roll spacing is controlled only by the servo hydraulic cylinders 7, 7 located at the center of the entrance and exit sides in the casting direction, for example, the roll spacing is controlled by the roll load on the entry side or the exit side. When fluctuation occurs, a moment is generated due to the imbalance of loads on the entry side and exit side, and since the column 5 is an elastic body, it bends, and the upper frame moves around the pin joint 8 at the tip of the piston rod 7b of the servo hydraulic cylinder 7. 1 oscillates. This oscillation phenomenon becomes a factor that deteriorates the internal quality (cracks, etc.) of the product, and therefore it is necessary to strictly control the roll spacing to eliminate fluctuations.

The present invention provides the following features in conventional roll segments:
It is an object of the present invention to provide a roll segment in which the roll interval can be accurately controlled without causing the above-described rocking phenomenon of the upper frame.

Means for Solving the Problems The roll segments in the casting equipment of the present invention include columns that are vertically slidably inserted into through-holes at the four corners of an upper frame that rotatably supports an upper roll on the lower surface side. The lower end of the column is fixed to the four corners of a lower frame that rotatably supports a lower roll on the upper surface side facing the upper frame, and servo hydraulic cylinders are attached to the four corners of the upper surface of the upper frame, The piston rod of this servo hydraulic cylinder is connected to the upper end of the column.

Function With the above configuration, the roll spacing is controlled by the servo hydraulic cylinders installed at the four corners of the upper surface of the upper frame, on the entry side, exit side, left, and right in the casting direction.
This can be done by controlling the posture of the upper frame at a point, and the roll interval on the entry side and exit side can be controlled individually, and the rocking phenomenon between the entry side and the exit side does not occur. In addition, it is also possible to narrow down the slab at an angle by actively changing the roll spacing on the entry and exit sides.

Embodiment An embodiment of the present invention will be described based on the drawings.
Reference numeral 11 denotes an upper frame, which rotatably supports the upper frame 12 on the lower side via a bearing, and 13 denotes a lower frame, which supports the lower roll 14 on the upper side facing the upper frame 11 and rotates via a bearing. I freely support it. Reference numeral 15 denotes columns provided at the front, rear, left and right corners of the upper and lower frames 11 and 12. The lower end of each column 15 is fixed to the lower frame 13, and the upper end of each column 15 is connected to the upper and lower through holes of the upper frame 11. 11a, and guides the upper frame 11 so that it can freely slide up and down. Reference numeral 16 is a servo-type hydraulic cylinder, and a main body 16a is attached to a bracket 1 above the through-holes 11a at the four corners of the upper surface of the upper frame 11.
1b, and the piston rod 16b
is connected to the upper end of the column 15 inserted into the through hole 11a of the upper frame 11. 17 is a pulse motor for a pair of left and right servo type hydraulic cylinders 16, 16, 18 is a transmission shaft, 19 is a ball screw and a servo valve unit,
The left and right servo hydraulic cylinders can be operated in synchronization, which simplifies the control system and is advantageous in terms of cost, but it may also be attached to each individual servo hydraulic cylinder 16 if necessary. 20 is a roll interval meter.

In the roll segment, a servo hydraulic cylinder 16 is arranged on the axis of the column 15 at the four corners of the upper surface of the upper frame 11, the main body 16a is attached to the upper frame 11 via a bracket 11b, and the piston rod 16b is attached to the column 15. Since it is connected to the upper end, the upper frame 11 can be moved up and down with respect to the lower frame 13 on the entry side and the exit side in the casting direction (arrow M) based on information from the roll interval meter 20 and the like. During casting, the distance between the upper roll 12 and the lower roll 14 can be freely controlled on both the entry side and the exit side in the casting direction by overcoming the strong bulging force. The device is also simple and has high rigidity.
Less influence of mechanical elasticity and high control accuracy. Furthermore, since it is possible to control the roll spacing separately on the entry and exit sides as described above, it is also possible to narrow down the slab at an angle, allowing for separate roll spacing control on the exit side of one roll segment and the entry side of the next segment. It is also possible to control the interval between the rolls in accordance with the slab squeezing slope, and by optimizing the slab squeezing amount, it is possible to improve the internal quality of the product.

Effects of the Invention As described above, in the present invention, since the distance between the upper roll and the lower roll of the roll segment can be controlled on the inlet side and the outlet side of the slab, fluctuations in roll load occur on the inlet side or the outlet side. However, the roller spacing can be adjusted immediately in response to fluctuations on each side, so there is no column deflection or oscillation like in the past, and no deterioration of the internal quality of the product occurs. . In addition, by actively varying the roll spacing between the entrance and exit sides, the slab can be narrowed down at an angle, further improving product quality.

[Brief explanation of drawings]

1 to 3 show one embodiment of the present invention, FIG. 1 is a partially cutaway plan view, FIG. 2 is a partially cutaway side view, FIG. 3 is a partially cutaway front view, and FIG. FIG. 4 is a schematic side view showing an example of a conventional device. 11...Top frame, 12...Top roll, 13
... lower frame, 14 ... lower roll, 15 ... column, 16 ... servo hydraulic cylinder, 17 ...
pulse motor.

Claims (1)

[Claims] 1 Columns are inserted vertically into through-holes at the four corners of an upper frame that rotatably supports an upper roll on the lower side, and a lower roll is rotatably supported on the upper side facing the upper frame. The lower ends of the columns are fixed to the four corners of the lower frame, and servo hydraulic cylinders are attached to the four corners of the upper surface of the upper frame, and the piston rods of the servo hydraulic cylinders are connected to the upper ends of the columns. A roll segment in continuous casting equipment characterized by: