JPH07328750A - Device for controlling force pressing short-side block in belt type continuous caster - Google Patents

Abstract

PURPOSE:To control the force pressing the mold part of a short-side block definitely. CONSTITUTION:The reaction force P of the force pressing the short-side block 31 is detected by a load cell 1 through a driving shaft 44, spherical surface bearing 4, bracket 3 and detecting rod 5. The detected reaction force P is fed back to a pressing force adjusting means and compared with the preset pressing force. Then, when the detected reaction force is larger or smaller than the preset pressing force, the driving torque of driving means for the short-side block is adjusted by the pressing force adjusting means, and the force pressing the short-side block is controlled definitely to prevent the wear of the short-side block and the chain part and the occurrence of the step difference between the mold part and the short-side block.

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 showing a schematic structure of an example of a conventional belt type continuous casting apparatus, 31 is a short side block, and brackets 32a, 32b and a supporting roller 3 are provided.
4 are connected in a chain shape, and their supporting rollers 34
Is guided by the guide groove 37 of the frame 36, and is endlessly rotated by the driving rotation of the sprocket 35. Reference numeral 51 is a pair of belts, which are endlessly rotated by the driving rotation of the pulley 52 and form the long side of the mold portion 50.

The mold portion of the short side block 31 is sandwiched by both ends of both belts 51, and the short side of the mold portion 50 is formed by the short side block 31. 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 portion 50. As shown in FIG.
The sprocket 35 is connected to the 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 driven.
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 blocks 31 are pushed between both belts 51 with a required pressing force P to prevent the generation of gaps between the short side blocks 31 of the mold part 50. And molten steel 60
Is poured into the mold part 50 from a pouring nozzle (not shown), and the molten steel 60 is cooled in the mold part 50 to form a cast piece 62 in which a solidified shell 61 is formed on four surfaces and is discharged from below.

[0005]

In the above-mentioned device, since the driving torque T is constant, the number of lifting blocks (weight) on the rising side due to the expected temperature decrease of the short side block 31 increases and the chain portion wears. The pushing force P decreases due to the rolling friction in the guide groove 37 of the support roller 34 and the increase in the friction of the chain part due to the passage of time, and in some cases, a gap is generated between the short side blocks 31 of the mold part 50. The casting will be stopped due to the leakage of molten metal from this gap. Therefore, there is no choice but to tend to set the driving force of the sprocket 35 excessively.

Further, the sliding mechanism such as the sliding clutch 41 regulates the driving torque T and is preset to a constant value, and cannot cope with the fluctuation of the driving force. Therefore, when the driving force has a large margin, the pushing force P becomes excessively large, the short-side blocks 31 wear together and the chain portion wears to reduce the life thereof, and the step between the short-side blocks 31 of the mold portion 50 due to the bending of the spring 33. Occurs, the quality of the cast slab 62 deteriorates.

The present invention has been proposed in order to solve such a problem, and provides an apparatus capable of controlling the pressing force to the mold portion of the short side block constantly during continuous casting of a slab. The challenge is to provide.

[0008]

According to the present invention, a pair of belts having a water-cooling mechanism and facing each other at a predetermined interval and rotating endlessly, and a pair of belts sandwiched between both ends of the belt and rotating endlessly together with the belt. To solve the above-mentioned problems in a belt-type continuous casting apparatus having a short-side block driving means, which pushes the short-side block connected body between both belts on the upper part of the mold section, which is composed of a pair of short-side block connected bodies. Therefore, a configuration is provided in which a pushing force detection mechanism provided in the short side block driving means and a pushing force adjusting means for adjusting the driving torque of the short side block driving means based on the detection value of the detection 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 current value may be increased or decreased to adjust the driving torque.

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

[0011]

In the present invention, the pushing force detector detects the pushing force of the short side block and feeds it back to the pushing force adjusting means for comparison with the preset pushing force. When the detected pushing force is larger or smaller than the set pushing force, the pushing force adjusting means adjusts the driving torque of the short side block driving means to control the pushing force of the short side block to a constant value. Prevents wear of the chain part and generation of a step between the short side blocks of the mold part.

[0012]

【Example】

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

A drive shaft 44 having a sprocket 35 fitted therein.
Are supported by the other frame 36 and the bracket 3 that moves in the horizontal direction together with the roller 11 via spherical bearings 4. Reference numeral 5 denotes a detection rod, one end of which is screwed to the bracket 3 and the other end of which is screwed to the block 7 that presses the load cell 1. Then, the effective length of the stopper 8 and the adjusting nut 6 is adjusted.

As shown in FIG. 2, the load cell 1 is connected to a controller 23 via an amplifier 21 and a filter 22,
The controller 23 is connected to the slip clutch 41 via a current regulator 24. Required pressure Pa for controller 23
Is set 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 in the direction opposite to the pressing force P between the belts 51 of the short side block 31 and this reaction force. The load cell 1 continuously detects the pushing force P, which is a force, via the spherical bearing 4, the bracket 3, the detection rod 5, and the block 7. The detected pushing 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 pushing force P with the set pushing force Pa, and when the pushing force P is larger or smaller than the set pushing force Pa, the difference in pushing force is converted into a current value. Then, while detecting the current value of the slip clutch 41, the current is increased / decreased to adjust the drive torque T, and the pressing force of the short side block is controlled to be constant.

By keeping this pushing force P constant, the short side block 3 due to the excessive pushing force of the mold portion 50.
The occurrence of a step between the two and the abrasion of the short side block 31 and the connecting chain portion thereof are prevented. 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. As with FIG. 2, FIG. 4 is a plan view showing a schematic configuration of the drive unit of the short side block. The second embodiment is the slip clutch 41 of the first embodiment described above.
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 pushing force P detected by the load cell 1 with the set pushing force Pa, and when a pushing force difference occurs, the pressure reducing valve 26 is operated to change the fluid pressure. By increasing or decreasing, the drive torque T of the fluid pressure motor 43 is adjusted, and the pushing 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 or the like is adjusted by the pushing force detecting mechanism provided in the short side block driving means and the pushing force adjusting means provided in the sliding mechanism or the like. However, by controlling the pushing force of the short side block to be constant, even if the rotation speed is made slightly higher than the rotation speed of the belt, excessive driving force does not act on the short side block and the chain part. .

Therefore, the life can be improved by reducing the wear, and the quality of the cast piece can be improved by eliminating the step between the short side blocks. Further, since the driving torque can be constantly grasped, the state of the short-side block and the chain portion can be estimated, and the inspection and repair time can be properly detected.

[Brief description of drawings]

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

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

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

FIG. 4 is a plan view showing a schematic configuration of a short-side block drive unit that is 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 device.

6 is a cutaway front view showing a VI-VI cross section of FIG. 5. FIG.

[Explanation 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 slip clutch 43 fluid pressure motor 44 drive shaft 50 mold part 51 belt P pushing force Pa Set push force T Drive torque

Front page continuation (72) Inventor Riki Okada 1 Nishinosu, Oita-shi, Oita Shin-Nippon Steel Co., Ltd. Oita Steel Co., Ltd. (72) Noriyuki Kanai 1 Nishinosu, Oita-shi, Oita Pref. Nippon Steel (72) Inventor Keiichi Katahira 20-1 Shintomi, Futtsu City, Chiba Nippon Steel Co., Ltd. Technology Development Division

Claims (1)

[Claims] 1. A pair of belts provided with a water cooling mechanism and facing each other at a predetermined interval and rotating endlessly, and a pair of short-side block connected bodies sandwiched between both ends of the belt and rotating endlessly with this belt. In a belt-type continuous casting apparatus equipped with short side block driving means for pushing the short side block connecting body between both belts on the upper side of the mold part, the pushing force detection provided on the short side block driving means A short side block pushing force control device for a belt type continuous casting apparatus, characterized in that a mechanism and a pushing force adjusting means for adjusting the driving torque of the short side block driving means based on a detection value of the detection mechanism are provided. .