JPH0333057B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Field of Application] The present invention relates to a slab reduction device installed at a point where slabs solidify in continuous casting equipment.

[Prior Art] In continuous casting equipment, solidification shrinkage occurs at the position where the slab completely solidifies (see FIG. 11). If this solidification shrinkage is left untreated, deformation due to shrinkage will appear in the inner part as shown by the broken line in FIG. 11, and a void 1 will appear. In this space, there is a flow of molten metal from the unsolidified layer 2, which causes segregation. Furthermore, the iron water pressure at the solidification position of the slab 3 is extremely high, and if there is a flow of molten metal in the cavity 1, bulging may occur. In the figure, 6 indicates a coagulated layer.

In order to eliminate the above-mentioned problems caused by solidification shrinkage, a device is required that supports the slab by continuously applying a reduction corresponding to the amount of solidification shrinkage, as shown by the two-dot chain line in Fig. 11. Japanese Patent Publication No. 50-55532,
A device shown in Japanese Patent Publication No. 55-32465 has been proposed.

[Problems to be Solved by the Invention] In such a continuous slab rolling down device, it is necessary to support the slab in a straight line by pressing the outer surface with a certain load in order to prevent bulging, and as described above, it is necessary to support the slab in a straight line. There is still an unsolidified portion on the upstream side of the device, and it is expected that the amount of reduction will be uneven compared to the completely solidified portion. Therefore, in this device, it is necessary to ensure that the pressure is correctly reduced to the set reduction amount.

However, the method shown in JP-A No. 50-55532 merely involves clamping and feeding the slab, and no consideration was given at all to how the slab should be clamped. Although the method shown in No. 1 also mentions the fluctuation of the hot water level, it does not take into account the non-uniformity of the reduction at all, and both of them still have the technical problems mentioned above. Therefore,
SUMMARY OF THE INVENTION The present invention aims to provide a slab rolling down device capable of correctly rolling down slabs so as to achieve a desired rolling clamping state.

[Means for Solving the Problems] The present invention arranges an outer bar and an inner bar for each row, integrates the outer bars to form an outer bar unit, and integrates the inner bars to form an inner bar unit. Both units are supported so as to be able to approach and move away from the slab, and both units are connected to cylinders that expand and contract in the direction in which the slab advances, and the pressing force of the rolling cylinder is applied to the outer bar unit and the inner bar unit through wheels, respectively. At the same time, a position sensor for detecting the amount of reduction is provided on a member moving toward and away from the slab, and a position sensor for detecting the amount of reduction is provided in the oil passage that supplies pressure oil to the reduction cylinder, and a pressure for detecting the reduction force to the bar unit is provided. A detector is installed, and the set reduction amount is determined by feeding back the signal from the position sensor and the signal corrected by the amount corresponding to the elastic deformation of the mechanical part including the beam of the bar unit determined based on the reduction force. The invention is characterized by being equipped with a rolling down control section.

[Function] Through the cooperation of the two cylinders that move both units forward and backward, and the two reduction cylinders, both units alternately support the slab by rolling down, and a position sensor detects the amount of reduction of both units. The signal and the signal of the elastically deformed portion of the mechanism section due to the rolling force are reproduced to set the rolling amount correctly to the set rolling amount.

[Examples] Examples of the present invention will be described below with reference to the drawings.

First, referring to FIG. 1, to outline the arrangement of this embodiment, the slab 3 cast from the mold 4 is supported and guided by pinch rolls 5, and is cooled during the transfer to form a solidified layer 6. While gradually growing, the cast slab reaches the rolling support device 7. The solidified layer 6 grows completely within the slab rolling support device 7, that is, the unsolidified layer 2 disappears.

This slab lowering support device 7 is equipped with bar blocks 8 and 9 having a pair of inner bars and outer bars on the upper and lower sides, and holds the slab 3 between the bar blocks.
is moved together with the slab 3.

Next, the mechanism of the slab rolling support device 7 will be described in detail with reference to FIGS. 2 to 8.

As mentioned above, the slab 3 is attached to the upper and lower bar blocks 8,
The upper and lower bar blocks 8, 9 are driven by driving devices 10, 11 in accordance with the movement of the slab 3.

Upper and lower bar blocks 8 and 9 and drive devices 10 and 1
Since they both have the same structure, the upper bar block will be explained below.

The upper bar block 8 further comprises an outer bar unit 12 and an inner bar unit 13, with outer bars 14 and inner bars 15 arranged in alternate rows, with the outer bar 14 belonging to the outer bar unit 12 and the inner bar 15 belonging to the inner bar unit 13, respectively. .

Outer bar unit 12 is shown in FIG.

The outer bar 14 is arranged parallel to the traveling direction of the slab 3, and its both ends are fixed to both end beams 16, 16 extending in the width direction of the slab 3. Also, both end beams 16,
Bridge 1 with a pair of 16 on the left and right, with a hollowed out bottom in the center
7 and 17 to form an outer bar unit 12. Brackets 18, 18 are provided protruding from the front surfaces of the bridges 17, 17, and the brackets 18,
The rod tips of cylinders 19, 19 are pivotally connected to 18, and the cylinders 19, 19 are attached to a beam 20 that spans a housing 29.

A rail 21 is fixed to the upper surface of each of the bridges 17, 17, and a bracket 22 is provided protrudingly. A balance cylinder (not shown) is connected to the bracket 22, and the rail 21 is pulled upwardly with a required force so that the rail 21 is connected to an outer wheel (described later). 23.

Inner bar unit 13 is shown in FIG.

The inner bar 15 is disposed so as to fit between the outer bars 14, and its center portion is connected to the beams 16, 16 at both ends.
and a central beam 25 which is slidably fitted into a space 24 formed by the bridges 17, 17. Furthermore, a slide block 26 is disposed on the upper surface of the central beam 25 and is fitted between the bridges 17, 17.
are fixed to form the inner bar unit 13. A bracket 27 is provided protruding from the front surface of the slide block 26, and the rod end of a cylinder 28 is pivotally attached to the bracket 27, and the cylinder 28 is attached to the beam 20. Also, the slide block 2
A rail 30 is fixed to the upper surface of the rail 6, and a bracket 31 is further provided to protrude. A balance cylinder (not shown) is connected to the bracket 31 and pulled upward with a required force so that the rail 30 comes into contact with an inner wheel 32, which will be described later.

The outer bar unit 14 and the inner bar unit 15
A driving device 10 that matches and drives the movement of the slab 3 is constituted by the cylinders 19 and 28 and the pressing device 33 described above.

One pair of pressing devices 33 are provided at the front and rear of the bar block 8.

The pressing device 33 will be explained using FIGS. 5 to 7.

The eccentric shaft 34 extending in the width direction of the slab 3 is mounted on a bearing 35.
It is rotatably provided in the housing 29 via. The eccentric shaft 34 is formed with an outer wheel support part 36 and an inner wheel support part 37, and the outer wheel support part 36 has a small diameter and its axis coincides with the axis O of the both end support parts 38 of the eccentric shaft 34. , the inner wheel support portion 37 has its eccentricity O″ offset by e with respect to the axis O.
An eccentric shaft 39 having an axial center O' eccentric by 0 is rotatably fitted to the eccentric shaft 39.
3 is rotatably fitted to the eccentric ring 39, and an arm 40 is fixed to the eccentric ring 39. Next, the inner wheel support part 3
The inner wheel 32 is rotatably fitted into the inner wheel 7.

A pin 41 is installed at one end of the eccentric shaft 34 at a required distance from the axis O, and the housing 2
The rod of the inner bar unit pressure cylinder 42, which is pivotally supported on the side surface of the inner bar unit 9, is connected to the pin 41. Further, a bracket 43 is provided protruding from the upper surface of the housing 29,
An outer bar unit lowering cylinder 44 is pivotally supported on the bracket 43, and the rod of the cylinder is pivotally attached to the arm 40.

Next, the operation of the above device will be explained with reference to FIGS. 8 and 9.

First, in FIG. 8, the basic movements of the outer bar 14 and the inner bar 15 that press against the slab 3 will be briefly described. The curve indicated by x in the figure is the locus of both bars 14, 15, in which they move together with the slab at the same speed as the slab 3 in section P, leave in section S, and return in section Q.
Section R is an operation for bringing both bars into contact with the slab, and is also an acceleration section since both bars and the slab are at the same speed when they contact. Both bars 14,
In the movement 15, the movement of the slab 3 in the advancing direction is performed by the cylinders 19, 28, and the movement toward and away from it is performed by the two reduction cylinders 42, 44, respectively.

FIG. 9 W shows the movement of the outer bar unit reduction cylinder 44, X shows the movement of the cylinder 19, Y shows the movement of the inner bar unit reduction cylinder 42, and Z
indicate the movement of the cylinder 28, the vertical axis indicates the amount of movement, and the horizontal axis indicates time.

When the outer bar unit lowering cylinder 44 is extended, the eccentric shaft 39 rotates, and the outer bar unit 12 is lowered by the amount of eccentricity. At this time, since the axis of the outer wheel support part 36 coincides with the axis of the both end support parts 38, the bar unit 12 can be raised and lowered independently regardless of the state of the eccentric shaft 34.

While the outer bar 14 is descending, its horizontal movement is reversed from backward to forward and further accelerated, and at the time the outer bar 14 reaches the slab 3, the forward speed matches the advancing speed of the slab 3. There is. The outer bar unit pressure cylinder 44 presses the outer bar 14 with a required force, and the cylinder 19 moves the outer bar 14 forward by a required stroke. Near the end of the stroke of the cylinder 19, the eccentric wheel 39 is rotated and raised by the outer bar unit reduction cylinder 44. When the outer bar 14 separates from the slab 3, the cylinder 19 causes the outer bar unit 12 to retreat. This backward speed is faster than the forward speed.

The movement of the inner bar 15 is also the same as the movement of the outer bar 14, and it is caused to move in Y and Z by cooperation between the cylinder 28 and the inner bar unit pressing cylinder 42.

Here, α and β in FIG. 9 are overlapped rolling sections of the outer bar 14 and the inner bar 15.

The rolling support of the slab 3 must be carried out continuously and without interruption. Therefore, in this device, the outer bar 14
An overlapping reduction section is provided to ensure the continuity of the pressing operation of the inner bar 15 and to prevent an unsupported state from occurring even momentarily.

Next, referring to FIG. 10, the reduction control section of the above device will be explained.

Since the lowering control sections of the outer bar unit 12 and the inner bar unit 13 have the same structure, the outer bar unit 12 will be explained below.

A position sensor 45 is attached to a member of the outer bar unit reduction cylinder 44 that approaches and moves away from the slab 3, and the position sensor 45 is connected to a comparator 46. A position setting device 47 and a correction calculator 48 are connected to the comparison calculator 46, and the comparison calculator 46 operates a servo valve 49 based on its output. The reduction cylinder 44 is connected to a hydraulic power source (not shown) via a servo valve 49, and an oil path 50 thereof is provided with a pressure detector 51, and the pressure detector 51 is connected to the correction calculator 48. Here, the correction calculator 48 has the beams 16 and 2 of the bar units 12 and 13 at the lowered position as seen from the sensor 45 mounting part.
5. The elastic deformation constants of the mechanical parts such as the wheels 23, 32 and the eccentric shaft 34 are set and input, and the elastic deformation of the mechanical parts with respect to the rolling force (hydraulic pressure) is calculated and input to the comparison calculator 46. be.

52 is an arithmetic unit that recognizes landing and separation from the slab 3, 53 and 54 are relays that change control commands between the slab grounding state and the space movement state, and 55 is a comparison unit that outputs cylinder position command feedback during space movement. An adder 56 is a position memory, 57 is a comparison adder that calculates the amount of reduction after landing, and 58 is a calculator that momentarily outputs the reduction command shown in FIG. 9 to the drive unit of each cylinder.

The calculator 52 recognizes that the bars 14 and 15 have landed on the slab 3 when the output P of the pressure detector 51 becomes larger than a certain finite value Po set in advance.
This landing recognition time is the marked position in Fig. 9, and when the output P of the pressure detector 51 becomes smaller than a certain finite value Po, the bars 14 and 15 are separated from the slab 3, and it is the marked position in Fig. 9. It is. When the bar is grounded to the slab 3, a relay 53 is turned on and a relay 54 is turned off, and when the bar is away from the slab 3, a relay operation command is issued from the computing unit 52 so as to do the opposite. Comparison adder 5
5 feeds back the output of the position sensor 45 in accordance with the spatial locus position command of the bars in a state where the bars 14, 15 are not in contact with the slab 3. When the bar lands, the output of the position sensor 45 at that time is stored in the position memory 56, and from then on, the output from the position sensor 45 is stored in the comparison adder 57.
Then, only the change in the output of the sensor 45 after landing is compared and sent to the comparison calculator 46. In the comparison calculator 46, the output of the comparison adder 57 and the correction amount calculated by the correction calculator 48 for the elastic change output of the mechanism part at the roll-down position as seen from the mounting part of the sensor 45 (the roll-down force is calculated by calculating the elastic deformation of the mechanism part) (value divided by a constant)
is subtracted from the output of the position setter 47.
C is a constant that adjusts the strength of this correction amount. By inputting the output of the position setting device 47 which commands the amount of reduction after landing, which is usually 1, to the comparator 46, the output is correctly fed back to the amount of reduction after landing. A reduction command is issued to the servo. By correctly recognizing and controlling the amount of reduction after landing in this manner, the amount of reduction after landing can be correctly controlled even if the inlet thickness of the slab 3 varies.

When the position of the outer bar unit 12 after landing, that is, the amount of reduction is set by the position setting device 47, pressure oil is supplied to the reduction cylinder 44 and the slab is reduced, but the amount of reduction is monitored by the position sensor 45. and is input to the comparator 46. Further, the oil pressure at that time is detected by the pressure detector 51 and sent to the correction calculator 4.
8 is input. The correction calculator 48 calculates the amount of elastic deformation of the mechanical section due to the rolling down of the rolling support device, and inputs the calculated amount to the comparison calculator 46 . The comparison calculator 46 calculates the actual reduction amount based on the set value, the output of the reduction displacement after landing from the comparison adder 57, and the output from the correction calculator 48, and if there is an excess or deficiency in the reduction amount, the servo valve is activated. 49 to correct the reduction until a predetermined amount is achieved.

In the above embodiment, the position sensor is provided in the reduction cylinder 44, but it is of course possible to provide it in other locations. For example, a position sensor is attached to a member that approaches and separates from the slab 3, such as the end beams 16 and the center beam 25, which are the bar body, and the elastic deformation constant for correction is determined by the elastic deformation of the end beams 16 and the center beam 25. The same is true if a deformation constant is used. Alternatively, the bar unit may be directly raised and lowered by a reduction cylinder.

[Effects of the Invention] As described above, the present invention provides a continuous slab rolling support device that has a simple structure, can reliably roll down and support slabs, and can roll slabs down to an accurately set rolling amount. Can be done.

[Brief explanation of the drawing]

Fig. 1 is a schematic diagram of continuous casting equipment equipped with a continuous cast slab rolling support device according to the present invention, Fig. 2 is a front view of the device, Fig. 3 is a perspective view of the outer bar unit, and Fig. 4
The figure is a perspective view of the inner bar unit, Figure 5 is a view in the direction of arrow A in Figure 2, Figure 6 is a view in the direction of arrow B in Figure 2, Figure 7 is a view in the direction of arrow C in Figure 2, and Figure 8 Figure 9 is an explanatory diagram showing the movement of the outer bar and inner bar, Figure 9 is an operating curve diagram of each cylinder, Figure 10 is a schematic diagram of the reduction control section, and Figure 11 is an explanatory diagram showing the solidification shrinkage deformation of the slab. be. 12 is an outer bar unit, 13 is an inner bar unit, 14 is an outer bar, 15 is an inner bar, 19 is a cylinder, 23 is an outer wheel, 28 is a cylinder, 32 is an inner wheel, 42 is an inner bar unit reduction cylinder, 4
4 is an outer bar unit pressure cylinder, 45 is a position sensor, 46 is a comparator, 47 is a position setting device, 4
8 is a correction calculator, 49 is a servo valve, and 51 is a pressure detector.

Claims (1)

[Claims] 1. An outer bar and an inner bar are arranged in every interval, the outer bar is integrated to form an outer bar unit, the inner bar is integrated to form an inner bar unit, and both units are made into a slab. cylinders that extend and retract in the slab advancing direction are connected to both units so that the pressing force of the rolling cylinders is applied to the outer bar unit and the inner bar unit through wheels, respectively. A position sensor for detecting the amount of reduction is provided on a member that approaches and moves away from the slab, and a pressure detector for detecting the reduction force to the bar unit is provided in the oil passage that supplies pressure oil to the reduction cylinder, and the position It is equipped with a roll-down control unit that feeds back signals from the sensor and a signal corrected by an amount corresponding to the elastic deformation of the mechanism including the beam of the bar unit determined based on the roll-down force, and the roll-down amount becomes the set roll-down amount. A slab rolling down device characterized by: