JPH0191945A - Cast slab depressing device - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] 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 and shrinkage is left untreated, deformation due to the shrinkage will appear on the inner side as indicated by the broken line in FIG. 11, creating a void l. In this gap, there is a flow of molten metal from the unsolidified layer 2, which causes segregation. Further, 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, it may cause bulging.

6 in the figure indicates a coagulated layer.

In order to eliminate the problems caused by the vertical shrinkage described above, 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. , JP 50-55532, JP 55-3246
The device shown in No. 5 has been proposed.

[Problems to be solved by the invention] In order to prevent bulging, it is necessary to support the slab in a straight line by pressing the outer surface with a certain load in such a continuous slab rolling support device, and as described above, 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 with respect to the completely solidified portion. Therefore, it is necessary to ensure that the device is correctly rolled down to the set 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, it is an object of the present invention to provide a slab rolling down device that can correctly roll down the slab so as to bring it into a desired rolled and clamped 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 separate from the slab, and cylinders that expand and contract in the direction of slab advancement are connected to both units, and the pressing force of the reduction cylinder is applied to the outer bar unit and the inner bar unit, respectively. It is equipped with a position sensor that detects the amount of reduction at the required position and a reduction force detector for the bar unit, and the elastic deformation of the mechanism is determined based on the signal from the position sensor and the reduction force. The present invention is characterized in that it includes a roll-down control unit configured to feed back a signal corrected for Ω corresponding to the roll-down amount so that the set roll-down amount becomes the set roll-down amount.

[Operation] 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 the position sensor detects the amount of reduction of both units. The signal and the signal of the elastically deformed portion of the mechanism part due to the rolling force are fed back to set the rolling amount correctly to the set rolling amount.

[Example] The present invention will be described in detail below with reference to the drawings.

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

This slab rolling support device 7 is equipped with a bar block 8.9 having a pair of inner bars and outer bars on the upper and lower sides, and the bar block holds the slab 3 and moves it together with the bar block 8.9 and the slab 3. ing.

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 held between the upper and lower bar blocks 8 and 9, and the upper and lower bar blocks 8 and 9 are connected to the drive device 10.1.
1 is matched with the movement of the slab 3 and driven.

Since the upper and lower bar blocks 8 and 9 and the drive devices 10 and 11 have the same structure, the upper bar block will be described below.

The upper herb lock 8 further comprises outer bar units 1-12 and an inner bar unit 13, and an outer bar 14 and an inner bar 15 are arranged every other month.The outer bar 14 is attached to the outer bar unit 12, and the inner bar 15 is attached to the inner bar unit'. Each belongs to 13.

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 te and ie extending in the width direction of the slab 3. Further, the outer bar unit 12 is constructed by connecting a pair of left and right beams 16 and 16 at both ends with a bridge 17° 17 whose lower surface at the center is cut. Said bridge 17.17
A bracket 18.18 is protruded from the front surface of the cylinder 18.18, and the rod tip of a cylinder 19.19 is pivotally attached to the bracket 18.18, and the cylinder 19.19 is attached to a beam 2o extending over the housing 29.

Rails 21 are provided on the upper surfaces of the bridges 17 and 17, respectively.
At the same time, a bracket 22 is provided protrudingly provided, 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 attached to the outer wheel 2, which will be described later.
It is made so that it touches 3.

The inner bar unit 13 is shown in FIG.

The inner bar 15 is arranged to fit between the outer bars 14,
The central part is connected to the beams ie and te at both ends and the bridge 17.
．． It is fixed to a central beam 25 which fits slidably into a space 24 formed by 17. Further, a slide block 26 that fits between the bridges L7 and 17 is fixed to the upper surface of the central beam 25 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.

Further, a rail 3o is fixed to the upper surface of the slide block 2B, and a bracket 31 is further provided to protrude. The bracket 31
A balance cylinder (not shown) is connected to the rail 3o, and the rail 3o is pulled upward with a required force so that the rail 3o comes into contact with an inner wheel 32, which will be described later.

A drive device 1O that drives the outer bar unit 14 and the inner bar unit 15 by matching them with the movement of the slab 3 is constituted by the cylinder 19, 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.

An eccentric shaft 34 extending in the width direction of the slab 3 is rotatably provided in the housing 29 via a bearing 35. The eccentric shaft 34 is formed with an outer wheel support portion 36 and an inner wheel support portion 37, and the outer wheel support portion 86 has a small diameter and its axis coincides with the axis 0 of the both end support portions 38 of the eccentric shaft 34. , the inner wheel support portion 37 has its eccentricity 0' offset by e with respect to the axis 0. The outer wheel support portion 36 has an axis e relative to the axis 0.
An eccentric wheel 39 having an axis 0' eccentric by 0' is rotatably fitted therein, and an outer wheel 23 is rotatably fitted on the eccentric wheel 39, and an arm 40 is fixed to the eccentric wheel 39. Next, the inner wheel 32 is rotatably fitted into the inner wheel support portion 37 .

A pin 41 is implanted at one end of the eccentric shaft 34 at a required distance from its axis 0, and a rod of an inner bar unit pressing cylinder 42 pivotally supported on the side surface of the housing 29 is connected to the pin 41. Further, a bracket 43 is provided projecting from the upper surface of the housing 29, and an outer bar unit lowering cylinder 44 is pivotally supported on the bracket 43, and a 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 and 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 because both bars and the slab are at the same speed at the time of contact. Both bars 14°1
In the movement of step 5, the movement of slab 3 in the advancing direction is caused by cylinder 1.
According to 9.28, the movement toward and away from the side pressure lower cylinder 4
2.44 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 shows the movement of the cylinder 28. The axis shows the amount of movement, and the horizontal axis shows time.

When the outer bar unit lowering cylinder 44 is extended, the eccentric wheel 39 rotates, and the outer bar unit 12 is lowered by the eccentric amount. 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 14 is pressed against the outer bar 14 with a required force by the outer bar unit reduction cylinder 44 and moved forward by the required stroke by the cylinder 19. 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 outer bar unit 12 is moved backward by the cylinder 19. 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 the cooperation between the cylinder 28 and the inner bar unit pressure cylinder 42 causes the movement like YSZ.

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, an overlapping reduction section is provided to ensure the continuity of the suppressing operations of the outer bar 14 and the inner bar 15 and to prevent an unsupported state from occurring even momentarily.

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

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

A position sensor 45 is attached to the outer bar unit lowering cylinder 44, and the position sensor 45 is connected to a comparator 46. The comparison calculator 46 includes a position setting device 47 and a correction calculator 4.
8 is connected, and the comparator 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 a pressure detector 51 is provided in the oil passage 5o, and the pressure detector 51 is connected to the correction calculator 48. Here, the elastic deformation constant at the lowered position as viewed from the sensor 44 mounting portion is set and inputted to the correction calculator 48, and the elastic deformation with respect to the lowering force (hydraulic pressure) is determined and inputted to the comparison calculator 46. .

52 is a computing 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 spatial movement state; 55 is a comparison adder that outputs cylinder position command feedback during spatial movement; 56 is a position memory;
57 is a comparison adder for calculating 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.

When the output P of the pressure detector 51 becomes larger than a preset finite value P0 in the calculator 52, the bar 14.15
is recognized as having landed on slab 3. This landing recognition time is the position ① in FIG. 9, and is a finite value P with the output P of the pressure detector 51. When it becomes smaller, it is when the bar 14, 15 separates from the slab 3, which is the opening position in Fig. 9. When the bar is grounded to the slab 3, the relay 53 is turned on, and the relay 54 is turned on.
A relay operation command is issued from the computing unit 52 so that the relay is turned off, and vice versa when the user is away. Comparison adder 55 is bar 1
4.15 is not in contact with the slab 3, the output of the position sensor 45 is fed back according to the spatial locus position command of the bar. 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 comparison adder 57 sends only the change in the output of the sensor 45 after landing to the comparison calculator 46. In the comparison calculator 46, the output of the comparison adder 57 and the correction amount for the elastic change output of the sensor 45 (the value obtained by dividing the rolling force by the elastic deformation constant of the sensor) are calculated in the correction calculator 48. is subtracted from the output of the comparator 46.

C is a constant that adjusts the strength of this correction amount.

Usually 1 or more. By inputting the output of the position setting device 47, which commands the amount of reduction after landing, to the comparator 46, the output is correctly fed back as the amount of reduction after landing, and a reduction command is issued to the servo. It will be done.

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 a comparison calculation is performed. 46.

Further, the oil pressure at that time is detected by the pressure detector 51 and inputted to the correction calculator 48. The correction calculator 48 calculates the elastic deformation due to the rolling down of the rolling support device and compares it with the comparison calculator 4.
Input to B. Comparison calculator 4B is set value, comparison adder 5
The actual amount of reduction is calculated based on the output of the reduction displacement after landing from 7 and the output from the correction calculator 48, and if there is an excess or deficiency in the amount of reduction, the servo valve 49 is operated to achieve the predetermined amount of reduction. Correct until.

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, it is possible to attach a position sensor to the both end beams 16 and the center beam 25, which are the bar bodies, and use the elastic deformation constant due to the elastic deformation of the end beams 1B and the center beam 25 as the elastic deformation constants for correction. It is. Furthermore, instead of the pressure detection by the pressure detector 51, a so-called load cell can be installed at the lower part of the rail 30 and used for detecting the load. Alternatively, the bar unit may be directly raised and lowered by a pressure 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 is an inner bar unit. A perspective view of the bar unit, FIG. 5 is a view in the direction of arrow A in FIG. 2, FIG. 6 is a view in the direction of arrow B in FIG. 2, FIG. 7 is a view in the direction of arrow C in FIG. FIG. 9 is an explanatory diagram showing the movement of the bar and the inner bar, FIG. 9 is an operating curve diagram of each cylinder, FIG. 12 is an outer harness, 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, 44 is an outer bar 45 is a position sensor, 4B is a comparison calculator, 47 is a position setting device, 48 is a correction calculator, 49 is a servo valve, and 51 is a pressure detector.

Claims (1)

[Claims] 1) Arrange an outer bar and an inner bar for each row, integrate the outer bar to form an outer bar unit, integrate the inner bar to form an inner bar unit, and connect both units to the slab. Both units are supported so that they can be approached and separated, and cylinders that expand and contract in the slab advancing direction are connected to both units, so that the pressing force of the rolling cylinder is applied to the outer bar unit and the inner bar unit through the wheels, and the required pressure is applied to the outer bar unit and the inner bar unit. Equipped with a position sensor that detects the amount of reduction at the position and a reduction force detector for the bar unit, and a signal corrected by the amount corresponding to the elastic deformation of the mechanism determined based on the signal from the position sensor and the reduction force is fed back. 1. A slab rolling-down device characterized by comprising a rolling-down control section that controls a rolling-down amount to be a set rolling-down amount.