JP3064181B2 - Short side block pushing force control device of belt type continuous casting machine - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a short side block connecting body forming a short side of a mold portion of a belt type continuous casting apparatus.
The present invention relates to a pushing force control device that pushes between both belts during casting.

[0002]

2. Description of the Related Art In FIGS. 5 and 6 which show a schematic structure of an example of a conventional belt type continuous casting apparatus, reference numeral 31 denotes a short side block, and brackets 32a and 32b and support rollers 3 are provided.
4 and a support roller 34
Is guided by a guide groove 37 of a frame 36, and rotates endlessly by driving rotation of the sprocket 35. Reference numeral 51 denotes a pair of belts, which rotate endlessly by driving rotation of the pulley 52 to form a long side of the mold section 50.

The short side block 31 has a molded portion sandwiched between both ends of the belts 51, and the short side block 31 forms a short side of the molded portion 50. A spring 33 is interposed between the brackets 32a and 32b so as to equalize the pressure between the short side block 31 and the cast piece 62 in the mold part 50. As shown in FIG.
The sprocket 35 is connected to a fluid pressure motor 43 via a drive shaft 44, a speed reducer 42, and a slip clutch 41.

The current value of the electromagnetic slip clutch 41 is preset so that a constant drive torque T acts on the drive shaft 44, the belt 51 is rotated, and the fluid pressure motor 4 is rotated.
3. The short side block 31 is rotated by the slip clutch 41, the speed reducer 42, the drive shaft 44 and the sprocket 35.
At this time, the short side block 31 is pushed between the two belts 51 with a required pressing force P to prevent the generation of a gap between the short side blocks 31 of the mold section 50. And molten steel 60
Is poured into a mold part 50 from a pouring nozzle (not shown), and the molten steel 60 is cooled in the mold part 50 to become a slab 62 having a solidified shell 61 formed on four surfaces, and is discharged from below.

[0005]

In the above-described apparatus, since the driving torque T is constant, the number (weight) of lifting blocks on the rising side due to the expected decrease in the temperature of the short side block 31 increases, and the wear due to the wear of the chain portion increases. The pushing force P decreases due to the rolling friction in the guide groove 37 of the support roller 34 and the friction of the chain portion due to the elapse of the use time, and in some cases, a gap is generated between the short side blocks 31 of the mold portion 50. Casting is stopped due to leakage of hot water from this gap. For this reason, the driving force of the sprocket 35 tends to be set excessively.

The slip mechanism such as the slip clutch 41 regulates the driving torque T and is preset at a constant value and cannot cope with fluctuations in the driving force. Therefore, if there is a large margin in the driving force, the pushing force P becomes excessively large, the life of the short side blocks 31 is shortened due to wear of the short side blocks 31 and the chain portion, and the step between the short side blocks 31 of the mold section 50 due to the bending of the spring 33. , The quality of the slab 62 deteriorates.

The present invention has been proposed in order to solve such problems, and an apparatus capable of controlling the pressing force of the short side block to the mold portion at the time of continuous casting of a slab is provided. The task is to provide.

[0008]

According to the present invention, there is provided a pair of belts provided with a water-cooling mechanism and rotating endlessly at predetermined intervals, and sandwiched between both ends of the belt to rotate endlessly with the belt. The object of the present invention is to solve the above-mentioned problem in a belt-type continuous casting apparatus having a short-side block driving means for pushing the short-side block connected body between both belts at the upper portion of a mold portion comprising a pair of short-side block connected bodies. Therefore, a configuration is adopted in which a pressing force detecting mechanism provided in the short side block driving means and a pressing force adjusting means for adjusting the driving torque of the short side block driving means based on the detection value of the detecting mechanism are adopted.

In the short side block pushing force control device according to the present invention, a slip clutch is interposed in the short side block driving means, and as the pushing force adjusting means for adjusting the driving torque of the short side block driving means, the slip clutch is provided. The drive torque can be adjusted by increasing or decreasing the current value.

Alternatively, a hydraulic motor with a pressure reducing valve is employed as the short side block driving means, and the pressure reducing valve is operated by the pressing force adjusting means to increase or decrease the fluid pressure so as to adjust the driving torque of the hydraulic pressure motor. The configuration may be as follows. In addition, various specific configurations of the short side block pressing force control device according to the present invention may be employed.

[0011]

According to the present invention, the pressing force of the short side block is detected by the pressing force detector, fed back to the pressing force adjusting means, and compared with a predetermined pressing force. When the detected pressing force is larger or smaller than the set pressing force, the driving force of the short side block driving unit is adjusted by the pressing force adjusting unit, and the pressing force of the short side block is controlled to be constant. Abrasion of the chain portion and generation of a step between short side blocks of the mold portion are prevented.

[0012]

【Example】

(First Embodiment) FIGS. 1 to 3 show a first embodiment of the present invention.
It will be explained by. In these figures, the same elements as those of the conventional apparatus shown in FIGS. 5 and 6 are denoted by the same reference numerals, and redundant description will be omitted. 1 and 2, reference numeral 1 denotes a load cell, which is mounted on a bracket 2 fixed to one frame 36. Reference numeral 11 denotes a roller which is axially mounted on a drive shaft 44 via a bearing 12 and is movable only in a horizontal direction between a pair of upper and lower stoppers 13 fixed to the bracket 2.

Drive shaft 44 on which sprocket 35 is fitted
Is supported by the other frame 36 and the bracket 3 that moves in the horizontal direction together with the roller 11 via the spherical bearing 4. A detection rod 5 has one end screwed to the bracket 3 and the other end screwed to a block 7 for pressing the load cell 1. The effective length is adjusted by the stopper 8 and the adjustment nut 6.

As shown in FIG. 2, the load cell 1 is connected to a controller 23 via an amplifier 21 and a filter 22.
This controller 23 is connected to the slip clutch 41 via a current regulator 24. Pressing force Pa required for controller 23
And the belt 51 is rotated, and the short side block 31 is rotated by the fluid pressure motor 43, the slip clutch 41, the speed reducer 42, the drive shaft 44 and the sprocket 35 at a speed slightly higher than the rotation speed of the belt 51. .

At this time, the drive shaft 44, the bearing 12 and the roller 11 try to move by the reaction force only in the horizontal direction opposite to the pushing force P between the two belts 51 of the short side block 31, and this reaction The load cell 1 continuously detects the pressing force P, which is a force, via the spherical bearing 4, the bracket 3, the detection rod 5, and the block 7. The detected pressing force P is amplified by the amplifier 21, and the impact force between the sprocket 35 and the chain portion, which is a disturbance, is reduced by the filter 22 and transmitted to the controller 23.

The controller 23 compares the pressing force P with the set pressing force Pa, and when the pressing force P becomes larger or smaller than the set pressing force Pa, converts the difference between the pressing forces into a current value. Then, while detecting the current value of the slip clutch 41, the current is increased or decreased to adjust the driving torque T, and the pressing force of the short side block is controlled to be constant.

By keeping the pressing force P constant, the short side block 3 due to the excessive pressing force of the mold portion 50 is formed.
This prevents the occurrence of a step between the two and the wear of the short side block 31 and its connecting chain. An outline of the above procedure is shown in the flowchart of FIG.

(Second Embodiment) Next, a second embodiment of the present invention shown in FIG. 4 will be described. FIG. 4 is a plan view showing a schematic configuration of a drive unit of the short side block, similarly to FIG. The second embodiment is different from the slip clutch 41 of the first embodiment described above.
And the pressure reducing valve 26 and the pressure gauge 27 are interposed between the fluid pressure motor 43 and the controller 23.

As in the first embodiment, the controller 23 compares the pressing force P detected by the load cell 1 with the set pressing force Pa, and when a difference in the pressing force is generated, operates the pressure reducing valve 26 to reduce the fluid pressure. The drive torque T of the fluid pressure motor 43 is adjusted by increasing or decreasing, and the pressing force P of the short side block is controlled to be constant.

[0020]

As described above, according to the present invention, the driving torque of the sliding mechanism is adjusted by the pressing force detecting mechanism provided in the short side block driving means and the pressing force adjusting means provided in the sliding mechanism. However, by controlling the pressing force of the short side block to be constant, even if the rotation speed is slightly higher than the rotation speed of the belt, excessive driving force does not act on the short side block or the chain portion. .

Therefore, the life can be improved by reducing the abrasion, and the quality of the slab can be improved by eliminating the step between the short side blocks. In addition, since the driving torque can be always grasped, the state of the short side block and the chain portion can be estimated, and the inspection and repair time thereof can be properly detected.

[Brief description of the drawings]

FIG. 1 is a plan view showing a cross section of a short side block driving section of a belt type continuous casting apparatus according to an embodiment of the present invention.

FIG. 2 is a plan view showing a schematic configuration of a driving unit of a short side block.

FIG. 3 is a flowchart summarizing a control procedure of a pressing force of a short side block.

FIG. 4 is a plan view showing a schematic configuration of a short side block driving unit according to a second embodiment of the present invention.

FIG. 5 is a side view showing a schematic configuration of an example of a conventional belt-type continuous casting apparatus.

6 is a cutaway front view showing a section taken along line VI-VI of FIG. 5;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Load cell 3 Bracket 5 Detection rod 11 Roller 13 Stopper 23 Controller 26 Pressure reducing valve 31 Short side block 34 Support roller 35 Sprocket 36 Frame 37 Guide groove 41 Sliding clutch 43 Fluid pressure motor 44 Drive shaft 50 Mold part 51 Belt P Pushing force Pa Set pushing force T Drive torque

Continuing from the front page (72) Inventor Rikimi Okada 1 Nishinosu, Oji, Oita City, Oita Prefecture Nippon Steel Corporation Oita Works (72) Inventor Noriyuki Kanai 1 Nishinosu, Oita City, Oita City, Oita Nippon Steel (72) Inventor Keiichi Katahira 20-1 Shintomi, Futtsu City, Chiba Prefecture Nippon Steel Corporation Technology Development Division (56) References JP-A-63-309356 (JP, A) JP-A JP-A-61-108455 (JP, A) JP-A-59-189043 (JP, A) JP-A-4-367354 (JP, A) JP-A-1-278945 (JP, A) JP-A-1-148442 (JP) , A) JP-A-64-91942 (JP, A) JP-A-64-71553 (JP, A) JP-A-1-68144 (JP, U) (58) Fields investigated (Int. Cl. ⁷ , DB Name) B22D 11/06 340 B22D 11/16 106

Claims (1)

(57) [Claims] 1. A pair of belts having a water-cooling mechanism and rotating endlessly facing each other at a predetermined interval, and a pair of short-side block couplings sandwiched between both ends of the belt and rotating endlessly with the belts. A belt-type continuous casting apparatus having short-side block driving means for pushing the linked short-side block between both belts on the upper portion of the mold portion comprising: a pressing force detection device provided on the short-side block driving means. A short side block pressing force control device for a belt type continuous casting apparatus, comprising: a mechanism; and a pressing force adjusting unit for adjusting a driving torque of the short side block driving unit based on a detection value of the detection mechanism. .