JP7221622B2 - SUPPORT ROLL POSITION ADJUSTMENT DEVICE AND POSITION ADJUSTMENT METHOD - Google Patents

Description

TECHNICAL FIELD The present invention relates to a support roll position adjustment device and a position adjustment method for adjusting the positions of support rolls in four directions provided in roll segments installed in a continuous casting apparatus by automatic control.

Conventionally, slabs such as blooms and billets cast by a continuous casting apparatus have problems such as internal cracks and surface cracks due to bulging that tries to push out the solidified shell outward. As countermeasures against this problem, reduction of the pitch of the support rolls that support the slab, accurate setting of the face-to-face distance between the opposing support rolls, strong cooling of the slab, etc. have been adopted.

However, the face-to-face distance between support rolls is usually set before and after casting (off-line). In other words, casting is in progress (online) until the regular replacement of the mold, during which time the face-to-face distance between the support rolls cannot be adjusted, and the impact and wear that occur when guiding the slab can widen the face-to-face distance. Bulging could not be suppressed, and quality defects such as slab shape defects and internal cracks caused by this occurred.

Therefore, a continuous casting apparatus is disclosed that detects the amount of bulging online and controls the pressing force and the pressing speed of support rolls that support the cast slab based on the signal at the time of detection (see, for example, Patent Document 1). .). Specifically, the support rolls that can move forward and backward with respect to the slab by a differential hydraulic cylinder, a hydraulic circuit having a pressure control valve and a switching valve, and the displacement of the support rolls are controlled via the hydraulic cylinder. and a detector that detects According to this configuration, it is possible to suppress bulging by installing the mold directly under the mold where breakout, in which the outer peripheral portion of the slab is broken and the molten steel flows out from inside, is likely to occur.

JP-A-59-185559

However, in Patent Literature 1 described above, since the structure is such that the support rolls are moved back and forth by the pistons of the cylinders so as to be orthogonal to the direction of movement of the cast slab, the installation space for the roll segments becomes wide. That is, in order to surround the slab with support rolls from four directions, a vertical and horizontal installation space corresponding to the sum of the length of at least two cylinders, the two support rolls, and the width of the slab is required. In addition, the roll segment itself becomes large.

Further, since the support roll position detector is based on the piston movement of a cylinder provided separately so as to interlock with the support roll, it is difficult to detect an accurate position. That is, depending on the state of the hydraulic oil and the length of the hydraulic circuit, the piston of the cylinder may not be able to follow the movement of the support roll, and the position of the support roll measured by the position detector lacks accuracy.

SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to reduce the size of the roll segment itself and the installation space, and to remotely control the detection and adjustment of the position of the support rolls from four directions on-line. To provide a position adjusting device and a position adjusting method for a support roll which avoid quality defects due to

That is, the support roll position adjusting device according to the present invention includes support rolls that support a cast piece cast in a mold in four directions, roll shafts that rotatably support the support rolls, and eccentric roll shafts. A gear provided in a roll segment of a continuous casting apparatus having a rotating eccentric shaft, the gear rotating in connection with the eccentric shaft, a rack meshing with the gear and sliding, and an encoder detecting the position of the rack. a cylinder having a piston that is the axis of the rack; and a controller that supplies an incompressible fluid to the cylinder so that the piston slides based on the encoder.

Preferably, the support roll position adjusting device further comprises a pressure sensor for detecting the internal pressure of the cylinder, and the controller supplies incompressible fluid to the cylinder based on the pressure sensor.

Further, in the method for adjusting the position of support rolls according to the present invention, a slab cast in a mold is supported by support rolls, the roll shafts that support the support rolls rotate, and the eccentric shafts that connect to the roll shafts rotate. It rotates eccentrically, the gear connected to the eccentric shaft rotates, the rack meshing with the gear slides, the position of the rack after sliding is detected by an encoder, and the shaft of the rack is detected based on the encoder. The controller supplies an incompressible fluid to the cylinder so that the piston slides, and the rack, the gear, the eccentric shaft, the roll shaft, and the support roll are interlocked to follow the sliding piston. characterized by

Further, the support roll position adjusting device according to the present invention includes support rolls that support a cast piece cast in a mold in four directions, roll shafts that rotatably support the support rolls, and eccentric roll shafts. a worm that is rotated by a hydraulic motor and that is provided in a roll segment of a continuous casting apparatus comprising a rotating eccentric shaft; a worm wheel that meshes with the worm and rotates while being connected to the eccentric shaft; It is characterized by comprising an encoder for detecting the amount of rotation of the worm wheel, and a controller for controlling the hydraulic motor based on the encoder.

The support roll position adjustment device and position adjustment method according to the present invention realizes the miniaturization of the roll segment itself and the space saving of the installation place, and remotely controls the detection and adjustment of the position of the support roll online from four directions. By doing so, quality defects due to bulging of the slab can be avoided.

1 is a conceptual diagram showing a front view of a state in which a roll segment equipped with a support roll position adjusting device according to an embodiment of the present invention is installed in a continuous casting apparatus; FIG. FIG. 2 is a conceptual diagram of a cross-sectional view of the AA portion of the roll segment shown in FIG. 1; 3 is an enlarged view of the X portion of the roll segment shown in FIG. 2; FIG. 4A and 4B are an enlarged conceptual cross-sectional view of the roll segment shown in FIG. 3 taken along the line BB, and FIG. FIG. 3 is another enlarged view of the X portion of the roll segment shown in FIG. 2; FIG. 6 is an enlarged conceptual diagram of a cross-sectional view of the DD portion of the roll segment shown in FIG. 5;

A support roll position adjustment device according to the present invention (hereinafter, also referred to as "this support roll position adjustment device") will be described with reference to FIGS. 1 to 6. FIG.
Incidentally, in these figures, for the same parts existing in a plurality, only one part is numbered, and overlapping parts may be omitted. In some cases, only parts necessary for explanation are shown, and unnecessary parts are not shown.

As shown in FIGS. 1 and 2, this support roll position adjusting device is provided in a roll segment S attached to a continuous casting apparatus (not shown) for casting billets. The roll segment S is installed directly below a mold (so-called top zone) to which molten steel stored in a dundish (not shown) is supplied. The slab M cast in the mold has a rectangular cross-section perpendicular to the casting direction and has four sides.

As shown in FIGS. 2 and 3, the roll segment S includes four support rolls 1 that support the cast slab M from four directions, and roll shafts 2 that rotatably support the respective support rolls 1. , and an eccentric shaft 3 for eccentrically rotating the roll shaft 2 . One unit is composed of the support roll 1, the roll shaft 2, and the eccentric shaft 3, and adjacent units are arranged in directions perpendicular to each other. That is, the cast slab M passes through a rectangular space surrounded by each of the support rolls 1 from four directions. Specifically, the support roll 1 rotates about the roll shaft 2 via a ball bearing (not shown), and the roll shaft 2 eccentrically rotates about the eccentric shaft 3 . The roll shaft 2 and the eccentric shaft 3 may be integrally molded or connected via a predetermined joint. The support roll 1 has a two-stage structure, but may have one stage or three or more stages.
According to this configuration, it is possible to guide the slab M while changing the position of the support rolls 1 from four directions. Specifically, when the slab M is about the same size as the predetermined size, when the slab M comes into contact with the support roll 1, the support roll 1 rotates around the roll shaft 2 to guide the slab M. On the other hand, when the slab M is partially or wholly larger than the predetermined dimensions, the slab M applies an external force to the support rolls 1, causing the roll shafts 2 to rotate eccentrically together with the eccentric shafts 3. Each of the rolls 1 or all four support rolls flare outwards. Therefore, the cast strip M can be restrained appropriately by the support rolls 1 and the positions of all the four sides of the cast strip M can be adjusted without damaging both sides.

As shown in FIGS. 3 and 4, this support roll position adjustment device detects the gear 4 connected to the eccentric shaft 3 of the support roll 1, the rack 5 that meshes with the gear 4 and slides, and the position of the rack. a cylinder 7 having a piston 71 that is the axis of the rack 5; I have. This support roll position adjustment device is arranged at one end in the longitudinal direction (axial direction) of the support roll 1, and the other end of the support roll 1 is in contact with the side portion of the support roll position adjustment device. . The support roll position adjusting device and the other end of the support roll 1 may be connected by a fastener such as a screw.
According to this configuration, the size of the support roll position adjustment device itself can be made compact, and since it can be installed in a small space with respect to the support roll 1, a roll segment that combines four support rolls 1 and supports them from four directions. miniaturization is realized.
Furthermore, since the position of the support rolls 1 can be remotely controlled, the slab M can be formed into an ideal shape. Specifically, the gear 4 rotates as the eccentric shaft 3 rotates, the rack 5 slides as the gear 4 rotates, and the position of the rack 5 changed by sliding is detected by the encoder 6. Since the controller supplies incompressible fluid to the cylinder 7 so that the piston 71, which is the axis of the rack 5, slides based on the detection result of the encoder 6, the cast piece M is partially or wholly larger than the predetermined size. The expanded support roll 1 can be returned to the default position. That is, when the internal pressure of one of the cylinders 7 is increased by the incompressible fluid supplied by the controller and the piston 7 slides, the rack 5 slides in the same direction and the gear 4 rotates. The shaft 2 interlocks and the support roll 1 moves. Therefore, the position of the support roll 1 can be remotely controlled by this support roll position adjustment device to suppress bulging.

The support roll position adjusting device further includes a pressure sensor (not shown) that detects the internal pressure of the cylinder 7, and the controller supplies the incompressible fluid to the cylinder 7 based on the pressure sensor.
According to this configuration, the incompressible fluid can be supplied to the cylinder 7 based on the change in the internal pressure of the cylinder 7 detected by the pressure sensor. can be used to remotely control the position of the support roll 1 more accurately.

Next, with reference to FIGS. 3 and 4, each part constituting the support roll position adjusting device will be described.

The gear 4 corresponds to a gear arranged at the end portion of the eccentric shaft 3 on the side opposite to the support roll 1, and may be integrally formed with the end portion of the eccentric shaft 3 or may be added later.

The rack 5 is provided integrally with the piston 71 of the cylinder 7 . In other words, the cylinder 7 includes a piston 71 with a rack 5 mounted thereon.

The encoder 6 corresponds to a rotary encoder and measures the position of the support roll 1 . The encoder 6 is provided with an encoder gear 61 via a coupling attached to the tip of the rotary shaft. The encoder gear 61 meshes with the rack 5 or the piston 71 except for the portion where the gear 4 meshes. That is, the encoder 6 follows the movement of the rack 5 or piston 71 .

The cylinder 7 is hydraulic, but may be pneumatic. The cylinder 7 is provided at both ends thereof with openings 7a for supplying and draining oil for pressurization and decompression. That is, the cylinder 7 has a structure in which the piston 71 slides reciprocally inside.

The controller receives each parameter detected by the encoder 8 and the pressure sensor, supplies oil to the cylinder 7 from a pressure source (not shown) to pressurize the cylinder 7, and drains the oil from the cylinder 7 to reduce the pressure. It is an electronic device equipped with a microcomputer with a built-in program that electronically commands its operation.
Specifically, the controller sets the position of the support roll 1 before operation and the internal pressure of the cylinder 7 as initial values. A change amount, which is the difference between the position of the support roll 1 after the change and the internal pressure of the cylinder 7 after the change based on the movement of the gear 4 and the rack 5 detected by the encoder 8 and the initial value, is calculated, and the change amount is calculated. In response, the opening/closing device is instructed about the opening/closing time and degree of opening/closing.

Next, referring to FIGS. 1 to 4, a position adjustment method using the support roll position adjustment device (hereinafter also referred to as "support roll position adjustment method") will be described.

The slab M is guided into a space surrounded from four directions by each of the support rolls 1 of the roll segment S attached to the continuous casting apparatus, and the slab M is given a predetermined size or shape. Adjust each position. Specifically, the position of the support roll 1 before guiding the slab M is set as an initial value, and when the longitudinal width and/or the lateral width of the slab M are larger than the initial values, the roll shaft 2 that supports the support roll 1 eccentrically rotates around the eccentric shaft 3, each of the opposing support rolls 1 or all of the support rolls in four directions spreads outward. At this time, the position of the support roll 1 after the encoder 6 has changed is detected by the rotation of the encoder gear 61 which meshes with the gear 4 connected to the eccentric shaft 3 and meshes with the rack 5 which slides. Based on the position of the support roll 1 detected by the encoder 6, the controller calculates the amount of change in the support roll 1, and slides the piston 71, which is the axis of the rack 5, to return the position of the support roll 1 to the initial value. , oil is supplied from the oil supply/drain port 7a of the cylinder 7 (oil is drained from the other oil supply/drain port). After that, the rack 5 slides in conjunction with the sliding of the piston 71, the gear 4 rotates in conjunction with the sliding of the rack 5, the eccentric shaft 3 rotates in conjunction with the rotation of the gear 4, and the eccentric shaft 3 rotates eccentrically, and the support roll 1 returns to a desired position in conjunction with the eccentric rotation of the rotary shaft 2 .

According to this method, each of the support rolls 1 can press the slab M from four directions with a constant pressure, so that the slab M can be given a predetermined size or shape. Therefore, it is possible to prevent swelling and cracking of the cast slab M caused by insufficient pressing.

Next, with reference to FIGS. 5 and 6, only the parts different from those explained in FIGS. 1 to 4 will be explained with respect to the configuration and each part of the support roll position adjusting device, and the parts that are not explained will be the same. It shall have structure and operational effect.
In addition, for ease of reference, etc., parts or parts shown in FIGS. number.

As shown in FIGS. 5 and 6, this support roll position adjusting device comprises a worm 104 rotated by a hydraulic motor 107, and a worm wheel 5 which meshes with the worm 104 and rotates while being connected to an eccentric shaft 103. , an encoder 106 for detecting the amount of rotation of the worm wheel 105 and a controller (not shown) for controlling the hydraulic motor 107 based on the encoder 106 .
According to this configuration, the position can be adjusted by widening or narrowing the distance between the faces of the support rolls 101 according to the current position of the support rolls 101 recognized in advance by the controller. That is, the worm 104 and the worm wheel 105 rotate according to the drive of the hydraulic motor 107, and the eccentric shaft 103 rotates eccentrically according to the worm wheel 105, so that the inter-surface distance of each support roll 101 widens or narrows. do. At this time, the encoder 106 detects the amount of rotation of the worm wheel 105 through the coupling, and the controller detects that each of the support rolls 101 has reached a specified position based on the amount of rotation and the current position. The hydraulic motor 107 is stopped at the time of determination.

The worm 104 corresponds to a screw gear having spirally cut teeth so as to mesh with a gear attached to the tip of the rotary shaft of the hydraulic motor 107. may be provided.

The worm wheel 105 is arranged at the end portion of the eccentric shaft 103 on the side opposite to the support roll 101, and corresponds to a gear whose teeth are circularly cut so as to mesh with the worm 104, and is integrated with the eccentric shaft 103. It may be provided or may be provided later.

The encoder 106 corresponds to a rotary encoder and is connected to the eccentric shaft 103 via a coupling. That is, the encoder 106 measures the position of the support roll 1 from the amount of rotation of the worm wheel 105 .

The controller receives parameters relating to the position of the support roll 101 and the rotation amount of the worm wheel 105 detected by the encoder 106 and controls the hydraulic motor 107 .
Specifically, the controller uses the position of the support roll 1 before operation as an initial value, and the movement amount or position after movement of the support roll 1 calculated from the rotation amount of the worm wheel 105 detected by the encoder 6 and the initial value. is calculated, and the drive of the hydraulic motor is controlled according to the amount of change.

Reference Signs List 1, 101 support roll 2, 102 roll shaft 3, 103 eccentric shaft 4 gear 5 rack 6, 106 encoder 7 cylinder 71 piston 104 worm 105 worm wheel 107 hydraulic motor M cast piece S roll segment

Claims (3)

Support rolls that support the slab cast in the mold in four directions;
a roll shaft that rotatably supports the support roll;
an eccentric shaft for eccentrically rotating the roll shaft;
Provided in the roll segment of a continuous casting device with
a gear connected to the eccentric shaft and rotating;
a rack that meshes with and slides with the gear;
an encoder that detects the position of the rack;
a cylinder having a piston that is the axis of the rack;
a controller that supplies an incompressible fluid to the cylinder so that the piston slides based on the detection result of the encoder;
A support roll position adjusting device comprising: Further comprising a pressure sensor that detects the internal pressure of the cylinder,
2. The apparatus according to claim 1, wherein the controller supplies the incompressible fluid to the cylinder based on changes in the internal pressure of the cylinder detected by the pressure sensor and changes in the position of the piston detected by the encoder. Positioning device for support rolls. The slab cast in the mold is supported by support rolls,
a roll shaft that supports the support roll eccentrically rotates around an eccentric shaft;
A gear connected to the eccentric shaft rotates,
A rack meshing with the gear slides,
An encoder detects the position of the rack after sliding,
The piston, which is the axis of the rack, slides based on the difference between the position of the support roll after the change and the internal pressure of the cylinder after the change and the initial value detected by the encoder based on the operation of the gear and the rack. a controller supplying an incompressible fluid to the cylinder so as to
A support roll position adjustment method, wherein the rack, the gear, the eccentric shaft, the roll shaft, and the support roll are interlocked so as to interlock with the sliding piston.

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