JPH0362505B2 - - Google Patents

Description

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

[Conventional technique] In continuous casting equipment, solidification shrinkage occurs at the position where the slab completely solidifies (see Figure 2). 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. 2, and a void 1 will be created. In this gap, 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 into the void 1, bulging may occur.

In order to eliminate the above-mentioned problems caused by solidification shrinkage, it is necessary to continuously apply a reduction corresponding to the amount of solidification shrinkage as shown by the two-dot chain line in Figure 2, and to press the outer surface with a certain load to prevent bulging. A device is required to support the slab in a uniform manner.

An example of this device is shown in FIGS. 3 to 5.

Fig. 3 is a schematic diagram of continuous casting equipment, in which 4 indicates a mold, 5 indicates a pinch roll, and mold 4
The cast slab 3 is supported and guided by pinch rolls 5, and is cooled as it progresses, reaching the slab rolling support device 7 while gradually growing its solidified layer 6. The slab rolling support device 7 supports the slab 3 in a rolling manner, and the unsolidified layer 2 of the slab 3 is completely eliminated within the slab rolling support device 7.

This slab rolling support device 7 is provided with upper and lower bar blocks 8, 9, which clamp the slab 3 and move the bar blocks 8, 9 together with the slab 3. The upper and lower bar blocks 8 and 9 have the same structure, and the structure of the upper bar block 8 will be briefly described below.

The upper bar block 8 consists of an outer bar unit 10 and an inner bar unit 11, and an outer bar 12 and an inner bar unit 11, which constitute a part of the outer bar unit 10.
The inner bars 13 forming a part of the inner bars 13 are arranged at intervals,
The outer bar 12 is integrated with both end beams 14, 14 and bridges 15, 15 to form an outer bar unit 10, and the inner bar 13 is integrated with a central beam 16 and a slide block 17 to form an inner bar unit 11. Moreover, the central beam 16 is connected to the both end beams 14,
14 and a space 18 formed by bridges 15, 15
The slide block 17 is fitted into both bridges 15, 15 and assembled, so that both units 10, 11 can move relative to each other in the slab advancing direction.

Both units 10 and 11 are connected to brackets 19 and 20.
The units 10 and 11 have rails 21a and 21 on the upper surface thereof.
b, 22a, 22b are provided, and the rail 21
a, 21b, 22a, 22b have wheels 23a, 2
3b, 24a, and 24b are adapted to rollably abut each other. Wheels 23a, 23b, 24a, 2
The shafts 25a and 25b supporting the wheel 4b have a wheel support portion and a portion supported by the housing eccentrically,
Wheels 23a, 23b, 24a, 24b selectively abut on the outer bar unit 10 and inner bar unit 11, and the wheels 2 are brought into contact with the lowering cylinders 26a, 26b.
3a, 23b, 24a, 24b so that a rolling force can be applied to both units 10, 11.

The cylinders 27, 28 move the units 10, 11 forward and backward with a phase shift of approximately 180 degrees, and further, in the forward movement of the unit, the cylinders 27, 28 are pressed down so that the wheels press the unit against the slab. Cylinders 26a, 26b and shafts 25a, 25b
If the rotations of the units 10 and 11 are made to work together, both units 10 and 11
alternately press down and support the slab 3.

The rolling down function required of the above-mentioned continuous slab rolling down support device is to set the rolling down amount to a predetermined value. The slab 3 cast from the mold 4 has a large variation in plate thickness, and if the amount of reduction is set based on the continuous slab reduction support device, the amount of reduction cannot be made constant. Further, as described above, there is still an unsolidified portion on the upstream side of the device, and when the rolling force is used as a reference, there is a problem that the amount of rolling down of the unsolidified portion becomes locally too large.

For this reason, in the above-mentioned continuous slab rolling support device,
It is necessary to perform a reduction control, and an example of a reduction control device is shown in FIG. 6, for example.

In FIG. 6, the slab supporting and lowering device 7 has the same structure as that shown in FIG. 3, and the control device is provided as a pair for the outer bar units of the bar blocks 8, 9 and for the inner bar units of the bar blocks 8, 9.

For example, the case where the bar blocks 8, 9 are provided on the outer bar units 10, 10' will be explained as follows.
Arms 3 are installed before and after the outer bar units 10, 10'.
A position detector 29 such as a magnescale is attached to detect the amount of reduction of the slab through the cylinders 1 and 32, and the position detector 29 is connected to the memory 33 and the calculator 34, and the reduction cylinder 26a and the housing are connected to each other. A load detector 35 such as a load cell provided between the two is connected to the memory 33 via a landing detector 36, and the memory 33 is connected to the computing unit 34. A servo valve 39 is connected to a calculator 38 for setting the amount of reduction due to lowering and raising/lowering per time, and based on the calculation result of the calculator 88, a servo valve 39 is installed in the pressure oil supply line of the reduction cylinder 26a.
I'm trying to get it to work. Also, reduction cylinder 2
A similar lowering control device is also provided on the 6b side.

Outer bar units 10, 1 of bar blocks 8, 9
0' are moved up and down so as to approach and separate from each other by the operation of the reduction cylinders 26a, 26b, etc. and the rotation of the shafts 25a, 25b, etc., and the upper and lower bars respectively contact the slab 3 intermittently. Therefore, the upper and lower outer bar units 1
When the outer bars of 0 and 10' are not in contact with the slab 3, the output signal from the load detector 35 is close to zero, but when the upper and lower outer bars are in contact with the slab 3, the output signal of the load detector 35 is The load signal increases rapidly, a load fluctuation ΔP ₁ is given from the load detector 35 to the landing detector 36, and the landing detector 36 sends a signal to the memory 33 indicating that the bar has landed on the slab 3. Output.

On the other hand, the position signals of the upper and lower outer bars detected by the position detector 29, that is, the thickness signals on the input side of the slab 3, are sent to the memory 33 and the arithmetic unit 34, and are sent from the landing detector 36 to the memory 33. When a landing signal is given to , the signal from the position detector 29 at that time is stored in the memory 33 as the reference value y ₁₀ , and from then on, the reference value y ₁₀ is used as the basis until a new reference value is reset. Control takes place.

The reference value _y10 stored in the memory 33 is continuously outputted and given to the calculator 34, and the position detector 2
From 9, the value y ₁ detected by the position detector 29 as the slab 3 is rolled down is given to the calculator 34 .

In the calculator 34, the difference between the detected value y ₁ and the reference value y ₁₀ is determined as the reduction amount Δy by the upper and lower outer bars, and Δy=y ₁ −
y ₁₀ , and this reduction amount Δy is calculated by the calculator 38.
added to. The calculator 38 includes a setting device 37 in advance.
Since the rolling reduction amount Δy ₀ due to one round _of rolling is _set by It is calculated by Δy ₀ ′=Δy−Δy ₀ , and the signal of the deviation Δy ₀ ′ is given to the servo valve 39.
The servo valve 39 is controlled so that the deviation Δy ₀ ' becomes zero, that is, the amount of reduction of the slab 3 from the reference position becomes the set amount of reduction, and the reduction cylinder 2
6a is activated. Further, the pressure reduction cylinder 26b side is similarly controlled.

[Problems to be Solved by the Invention] However, in the above-mentioned device, when a rolling force is generated by rolling down the slab 3, the bar blocks 8 and 9 have an arc-shaped shape as shown by the two-dot chain line in FIG. Because elastic deformation occurs, the position detectors 29, 30
When the object is moved elastically, the position band detector 2
There is a problem in that the accuracy in detecting the amount of reduction by 9 and 30 decreases, and it is not possible to perform uniform and accurate reduction of the slab.

The present invention has been made in view of the above-mentioned circumstances, with the object of making it possible to perform uniform and accurate rolling down of slabs.

[Means for Solving the Problems] The present invention is a continuous slab rolling support device that supports rolling slabs by intermittently and alternately pressing two types of bars against slabs, which detects the amount of slab rolling. a position detector that detects the rolling force of the slab, and a load detector that detects the rolling force of the slab.
A landing detector detects that the bar has landed on the slab from the load detected by the load detector, and a signal from the position detector at the time when a landing signal is given from the landing detector is set as a reference value. a memory device for storing the information as a pressure reduction amount;
an elastic deformation displacement amount calculator that calculates the amount of elastic deformation displacement based on the load from the load detector; and correction by taking the difference between the elastic deformation displacement amount from the elastic deformation displacement amount calculator and the reduction amount from the calculator. Provided in a line that supplies fluid to a computing device that calculates the amount of reduction, and a reduction cylinder that calculates the difference between the corrected amount of reduction from the computer and a preset target amount of reduction, and presses the bar against the slab. This system is equipped with an arithmetic unit that provides command signals to the control valves.

[Operation] The bar is intermittently pressed against the slab, maintains the required reduction amount, and moves together with the slab. At this time, when the landing detector detects that the bar has landed on the slab, the signal from the position detector that detects the amount of reduction in the slab is stored in the memory as a reference value, and a predetermined calculator The amount of reduction is determined by taking the difference between the reference value from the memory and the detected value from the position detector, and the amount of elastic deformation is determined by the elastic deformation displacement amount calculator based on the load from the load detector. In the computing unit, a correction reduction amount is obtained by taking the difference between the elastic deformation displacement amount from the elastic deformation displacement amount calculation unit and the reduction amount from the above calculation unit, and further, in a predetermined calculation unit, the correction reduction amount from the above calculation unit is calculated. The difference between the amount and the preset target pressure reduction amount is calculated, this difference is given to the control valve as a command signal, and the fluid supplied to the pressure reduction cylinder is controlled so that the corrected pressure reduction amount matches the target pressure reduction amount.

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

FIG. 1 shows an embodiment of the present invention, in which the same parts as those shown in FIG. 6 are given the same reference numerals.

Load detectors 35 and 40 are arranged between the reduction cylinders 26a and 26b and the housing, and the load detector 35 is connected to the landing detector 36 and the calculator 4
1, the load detector 40 is connected to the computing unit 41, the computing unit 41 is connected to the elastic deformation displacement computing unit 42, and the elastic deformation displacement computing unit 42 and computing unit 3
4 to the arithmetic unit 43, and the arithmetic unit 43 to the arithmetic unit 3.
Connect to 8.

When the outer bars of the upper and lower outer bar units 10, 10' contact the slab 3, the load signals of the load detectors 35, 40 increase rapidly, and the load signals from the load detector 35 are sent to the landing detector 36 and the calculator 41. A load variation ΔP ₁ is given, and a load signal ΔP ₂ is given from the load detector 40 to a calculator 41 .

When the landing detector 36 is given the load variation ΔP ₁ , it outputs a landing signal of the outer bar to the slab to the memory 36, and the memory 33 stores the position at the time when the landing signal was input. The signal from the detector 29 is the reference value
It is stored in the storage device 33 as _y10 . This standard value
_y10 is held in the memory 33 until a new reference value is reset at the next rolling down, and is continuously output to the calculator 34. The value y ₁ found in 29
is given to the calculator 34, and the calculator 34 sets the difference between the detected value y ₁ and the reference value y ₁₀ as the reduction amount Δy, and calculates Δy=y ₁
−y ₁₀ and added to the arithmetic unit 43.

In the calculator 41, the load fluctuation parts ΔP ₁ and ΔP ₂ are added to obtain the total load fluctuation ΔP=ΔP ₁ +ΔP ₂ , and the total load fluctuation ΔP is added to the elastic deformation displacement amount calculator 42 to calculate the total load fluctuation ΔP=ΔP 1 +ΔP 2. The amount of elastic deformation Δy′ of the position detector attached to the outer bar unit is Δy′=K・
The elastic deformation displacement amount Δy' is calculated by ΔP (where K is the spring constant of the outer bar unit) and is output to the calculator 43.

In the calculator 43, the corrected reduction amount Δy″, which is the difference between the reduction amount Δy and the elastic deformation displacement amount Δy′, is calculated as Δy″=Δy−Δy′
is calculated and the signal is sent to the calculation unit 38,
The calculator 38 calculates the deviation Δy 0 ' between the set rolling reduction amount Δy ₀ per time and the corrected rolling reduction amount Δy'' given from the calculator 43 using Δy _{0 '} = Δy'' - Δy ₀ , and the deviation Δy ₀ ' signal is given to the servo valve 39,
As in the case of FIG. 6, the servo valve 39 is controlled so that the deviation Δy ₀ ' becomes zero, that is, the amount of reduction from the reference position becomes the set amount of reduction,
The reduction cylinder 26a is activated.

As described above, when rolling down the slab, accurate and uniform rolling is performed by correcting the rolling reduction amount in consideration of the amount of elastic deformation displacement of the position detector attached to the outer bar.

In addition, in the embodiments of the present invention, the case where the slab is rolled down with the outer bar has been explained, but it is naturally applicable to the case where the slab is rolled down with the inner bar. It goes without saying that the provision of such a device enables more accurate and uniform control, and that various other changes can be made without departing from the gist of the present invention.

[Effects of the Invention] According to the continuous slab reduction control device of the present invention, the amount of reduction can be corrected by taking into account the amount of elastic deformation displacement of the position detector due to the elastic deformation of the bar, so that the slab can be rolled accurately and uniformly. An excellent effect can be achieved in that rolling down is possible.

[Brief explanation of drawings]

Fig. 1 is an explanatory diagram of one embodiment of the continuous slab reduction control device of the present invention, Fig. 2 is an explanatory diagram showing solidification shrinkage deformation of slab, Fig. 3 is a schematic diagram of continuous casting equipment, and Fig. 4
The figure is a perspective view of the outer bar unit of the slab rolling support device, Figure 5 is a perspective view of the inner bar unit, and Figure 6 is an explanatory view of an example of a device that can be considered for continuously controlling slab rolling. . In the figure, 3 is a slab, 7 is a slab rolling support device, 8,
9 is a bar block, 12 is an outer bar, 13 is an inner bar, 26a, b are reduction cylinders, 27, 28 are cylinders, 29, 30 are position detectors, 33 is a memory device, 34 is an arithmetic unit, 35 is a load detector , 36 is a landing detector, 37 is a setting device, 38 is a calculator, 39 is a servo valve, 40 is a load detector, 41 is a calculator, 4
Reference numeral 2 indicates an elastic deformation displacement amount computing unit, and numeral 43 indicates a computing unit.

Claims (1)

[Claims] 1. In a continuous slab rolling support device that supports rolling slabs by intermittently and alternately pressing two types of bars against slabs, there is a position detector that detects the rolling force of the slab, and a position detector that detects the rolling force of the slab. a load detector for detecting, a landing detector for detecting that the bar has landed on the slab from the load detected by the load detector, and detecting the position at the time when a landing signal is given from the landing detector. a storage device that stores the signal from the device as a reference value; a calculator that calculates the reduction amount by taking the difference between the reference value from the storage device and the detected value from the position detector; an elastic deformation displacement amount calculator that calculates the amount of elastic deformation displacement based on the elastic deformation displacement amount calculator; and a calculator that calculates the corrected reduction amount by taking the difference between the elastic deformation displacement amount from the elastic deformation displacement amount calculator and the reduction amount from the calculator. Then, the difference between the corrected reduction amount from the calculator and the preset target reduction amount is calculated, and this difference is used as a command signal to the control valve installed in the line that supplies fluid to the reduction cylinder that presses the bar against the slab. 1. A continuous slab reduction control device, characterized in that it is equipped with a computing unit that provides the following information: