JP2023135704A - Casting strand cutting device and cutting method - Google Patents

Abstract

To provide a casting strand cutting device and cutting method capable of accurately cutting a cast slab having a desired length without using a measuring roll.SOLUTION: A casting strand cutting device for cutting a continuously casted casting strand to obtain a cast slab, includes: cutting means that cuts the casting strand while moving in a casting direction of the casting strand in synchronization with a casting speed of the casting strand: a laser distance meter that is disposed at a position on a downstream side in the casting direction of the casting strand with respect to a moving range of the cutting means so as to face a tip surface in the casting direction of the casting strand, and measures a distance to the tip surface in the casting direction; and control means that calculates a length in the casting direction of the casting strand from the tip surface in the casting direction based on the distance measured by the laser distance meter, and controls the cutting means to start cutting the casting strand at a timing when a length in the casting direction reaches an object length of the cast slab.SELECTED DRAWING: Figure 1

Description

The present invention relates to a casting strand cutting device and a cutting method for obtaining a casting slab by cutting a continuously cast casting strand.

Generally, in continuous casting equipment, as shown in FIG. 3, a cast strand ST continuously cast in a mold 101 is changed direction from a vertical direction to a horizontal direction by a plurality of pinch rolls 103 that are rotationally driven by a motor 102. The cast slab S is then cut by a slab cutting machine 105 into a cast slab S of a predetermined length, and then transported by a transport roll 104. To measure the length of a cast slab S in such continuous casting equipment, a measure roll 106 is rotated by a casting strand ST, and the pulse output of a pulse generator (PLG) 107 connected to the measure roll 106 is controlled by a speed control programming controller (PLC). This is performed by counting using a counter in 108 (for example, see Patent Document 1).

Japanese Patent Application Publication No. 6-154981 Japanese Patent Application Publication No. 2001-340950 Japanese Patent Application Publication No. 2012-130949

When measuring the length of a cast slab using a measuring roll, length measurement errors may occur due to abnormalities such as wear, non-rolling, or slipping of the measuring roll. Against this background, Patent Document 2 discloses a technique for switching from length measurement using the measure roll to length measurement using the final drive roll when an abnormality occurs in the measure roll. Further, Patent Document 3 discloses that when the cutting device is moving in synchronization with the casting strand, the amount of movement of the cutting device is measured, and the measured value is used to correct the length measurement value based on the pulse output of the pulse generator. The technology has been disclosed. However, both the technologies of Patent Document 2 and Patent Document 3 are temporary measures that allow casting to continue when an abnormality occurs in the measure roll during casting, and the measure roll cannot be repaired after casting is completed. is necessary. When repairing the measure roll, as shown in FIG. 4, it is necessary to remove and install not only the measure roll 106 but also the connecting shaft 109 that transmits the rotation of the measure roll 106 to the PLG 107 and the heat shield plate. , it takes a lot of time to restore the continuous casting equipment.

The present invention has been made to solve the above problems, and its purpose is to provide a casting strand cutting device and cutting method that can cut a casting slab having a desired length with high accuracy without using a measuring roll. It's about doing.

A casting strand cutting device according to the present invention is a casting strand cutting device for obtaining a casting slab by cutting a continuously cast casting strand, and the casting direction of the casting strand is synchronized with the casting speed of the casting strand. a cutting means for cutting the cast strand while moving in the direction of the cast strand; and a cutting means disposed at a position on the downstream side in the casting direction of the casting strand with respect to the moving range of the cutting means, so as to face a tip end surface of the casting strand in the casting direction, A laser distance meter that measures the distance to the tip surface in the casting direction, and a length in the casting direction of the cast strand from the tip surface in the casting direction based on the distance measured by the laser distance meter, and a length in the casting direction of the casting strand from the tip surface in the casting direction is calculated. and control means for controlling the cutting means to start cutting the cast strand at the timing when the length reaches the target length of the cast slab.

In the casting strand cutting device according to the invention, the laser distance meter is arranged on the conveyance path of the casting slab, and includes a retracting means for retracting the laser distance meter from the conveyance path of the casting slab.

In the casting strand cutting device according to the present invention, in the above invention, purge gas is injected to the leading end surface in the casting direction.

The method for cutting a cast strand according to the present invention is a method for cutting a cast strand to obtain a cast slab by cutting a continuously cast cast strand, the method comprising: cutting the cast strand in the casting direction in synchronization with the casting speed of the cast strand; using a laser distance meter disposed at a position downstream in the casting direction of the casting strand from a moving range of the cutting means that cuts the casting strand while moving to face the tip end surface of the casting strand in the casting direction; a measuring step of measuring the distance to the tip surface in the casting direction, and calculating the length in the casting direction of the casting strand from the tip surface in the casting direction based on the distance measured by the laser distance meter; The method includes the step of controlling the cutting means to start cutting the cast strand at a timing when the directional length reaches a target length of the cast slab.

In the method for cutting a cast strand according to the present invention, in the above invention, the laser distance meter is arranged on the conveyance path of the casting slab, and when the casting slab passes through the position where the laser range finder is arranged, the measurement is performed. After completing the step, the laser distance meter is retreated from the conveyance path of the casting slab, and after the casting slab passes through the position where the laser distance meter is placed, the measuring step is started.

In the method for cutting a cast strand according to the present invention, in the above invention, the measuring step is performed while injecting purge gas to the leading end face in the casting direction.

According to the casting strand cutting device and cutting method according to the present invention, it is possible to accurately cut a casting slab having a desired length without using a measuring roll.

FIG. 1 is a schematic diagram showing the configuration of a casting strand cutting device according to an embodiment of the present invention. FIG. 2 is a diagram showing the flow of a method for cutting a cast strand, which is an embodiment of the present invention. FIG. 3 is a diagram for explaining a conventional casting slab length measurement method. FIG. 4 is a diagram showing the configuration of the connecting shaft.

DESCRIPTION OF THE PREFERRED EMBODIMENTS A cast strand cutting device and cutting method according to an embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 is a schematic diagram showing the configuration of a casting strand cutting device according to an embodiment of the present invention. As shown in FIG. 1, a casting strand cutting device that is an embodiment of the present invention is a device that cuts a casting strand ST to obtain a casting slab S in continuous casting equipment. In the continuous casting equipment, the cast strand ST continuously cast in the mold 101 is pulled out while changing direction from the vertical direction to the horizontal direction by a plurality of pinch rolls 103 that are rotationally driven by a motor 102. After being cut into a casting slab S of a predetermined length by a casting strand cutting device, the casting slab S is transported by a transport roll 104.

A casting strand cutting device according to an embodiment of the present invention includes a torch cutter 2, a truck 3, a sensor 4, a purge nozzle 5, a laser distance meter 6, a lifting device 7, and a control device 8 as main components. ing.

The torch cutter 2 is a cutting means that cuts a cast slab S of a predetermined length from the cast strand ST.

The truck 3 is a traveling means that can travel within a traveling range L3 along the casting direction of the cast strand ST in synchronization with the casting speed of the cast strand ST, and carries the torch cutter 2 thereon.

The sensor 4 is arranged between the conveyor rolls 104 on the upstream side in the casting direction of the arrangement position of the lifting device 7, and detects the presence or absence of the cast slab S at the arrangement position. The sensor 4 outputs a detection signal indicating the presence or absence of the cast slab S to the lifting device 7.

The purge nozzle 5 is arranged above the transport roll 104 so as to face the leading end surface of the casting strand ST in the casting direction, and injects a purge gas such as an inert gas toward the leading end surface of the casting strand ST in the casting direction.

The laser distance meter 6 is disposed at a position on the downstream side in the casting direction of the travel range L3 of the truck 3 so as to face the tip end surface of the casting strand ST in the casting direction. The laser distance meter 6 measures the position of the torch cutter 2 in the casting direction (cutting start position) when the trolley 3 is at the most upstream position in the casting direction, and measures the distance to the leading end surface in the casting direction of the cast strand ST being conveyed. The distance in the casting direction (measurement distance L1) is measured continuously or intermittently. The laser distance meter 6 outputs a signal indicating the measured distance L1 to the control device 8. In addition, since the laser distance meter 6 is arranged at a position downstream of the running range L3 of the trolley 3 in the casting direction, the measurable distance of the laser rangefinder 6 needs to be longer than the length of the running range L3 of the trolley 3. There is.

The elevating device 7 is constituted by, for example, a gate-shaped frame on which the laser range finder 6 is placed so as to be movable up and down, and moves the laser range finder 6 up and down in the vertical direction. When the casting slab S is conveyed straight along the casting direction of the casting strand ST, the laser distance meter 6 is placed on the conveyance path of the casting slab S. Therefore, in such a case, in order to avoid contact between the laser range finder 6 and the casting slab S, the laser range finder 6 is moved up and down from the casting slab S by using the lifting device 7. . However, in cases where the conveyance direction of the cast slab S can be changed by a turntable or the like, and the cast slab S is conveyed in a direction other than the casting direction of the cast strand ST, the direction of the conveyance of the cast strand ST on the downstream side of the turntable, etc. If the laser distance meter 6 can be placed in the casting direction, the lifting device 7 does not necessarily need to be installed. Further, it is preferable that the lifting device 7 lifts and lowers the laser distance meter 6 in accordance with the detection signal output from the sensor 4. In this case, when the sensor 4 detects the casting slab S, the lifting device 7 raises the laser distance meter 6. On the other hand, if the sensor 4 does not detect the casting slab S, the lifting device 7 lowers the laser distance meter 6, and the laser distance meter 6 measures the distance in the casting direction to the tip end face of the casting strand ST in the casting direction. .

The control device 8 is constituted by an information processing device such as a computer, and controls the entire operation of the casting strand cutting device of this embodiment. Specifically, the control device 8 calculates the unit weight of the cast strand ST in response to input of the commanded mass of the slab to be cut, and calculates the unit weight of the slab to be cut based on the calculated unit weight of the cast strand ST. Calculate the slab cutting command length. Note that information such as correction coefficients for accurately calculating the unit weight of the cast strand ST and measured values of external dimensions such as width and thickness of the cast strand ST are input to the control device 8. It's okay.

Further, the control device 8 controls the torch cutter 2 to be in operation so as to start cutting the cast strand ST when the conveyance distance of the cast strand ST reaches the slab cutting command length, and the cutting work of the cast strand ST is completed. The operating state of the torch cutter 2 is continued until the Specifically, the laser distance meter 6 continuously or intermittently measures the distance in the casting direction (measured distance L1) from the cutting start position of the torch cutter 2 to the leading end surface in the casting direction of the cast strand ST being conveyed. Measure to. Here, the amount of change in the measurement distance L1 (the distance by which the tip end surface of the casting strand ST in the casting direction approaches the laser distance meter 6) is the cutting of the casting slab S if the casting strand ST was started to be cut at that point. The length will be L. That is, the cutting length L of the cast slab S is the value obtained by subtracting the measured distance L1 from the distance L2 between the torch cutter 2 and the laser distance meter 6.

First, the control device 8 calculates the cutting length L of the cast slab S from the measured distance L1 output from the laser distance meter 6. Next, as shown in FIG. 2(a), the control device 8 causes the torch cutter to start cutting the cast strand ST when the calculated cutting length L of the cast slab S reaches the slab cutting command length. The torch cutter 2 is controlled to be in an operating state, and the operating state of the torch cutter 2 is continued until the cutting work of the cast strand ST is completed while moving the trolley 3 in synchronization with the casting speed of the cast strand ST. Next, as shown in FIG. 2(b), when the sensor 4 detects the casting slab S after the cutting of the casting slab is completed, the control device 8 causes the elevating device 7 to raise the laser distance meter 6. Finally, as shown in FIG. 2(c), when the sensor 4 no longer detects the casting slab S, the control device 8 lowers the laser distance meter 6 using the lifting device 7, and again detects the tip of the casting strand ST. Measure the distance between. Thereafter, the same process is repeated.

Note that, as described above, in this embodiment, the conveyance distance of the cast strand ST is measured using the laser distance meter 6. For this reason, it is desirable to make the intensity of the laser beam transmitted from the transmitter of the laser rangefinder 6, reflected by the tip end surface of the casting strand ST in the casting direction, and received by the receiver of the laser rangefinder 6 as large as possible. However, if foreign matter such as scale or slag generated during fusing adheres to the tip end surface of the cast strand ST in the casting direction, it will interfere with the reflection of the laser beam. Therefore, it is preferable to inject purge gas from the purge nozzle 5 toward the distal end surface of the casting strand ST in the casting direction, and use the purge gas to scatter and remove foreign substances. Further, in this embodiment, the conveyance distance of the cast strand ST is mainly measured using the laser distance meter 6, but length measurement using other length measuring means such as a measuring roll may also be used.

As is clear from the above description, the casting strand cutting device which is an embodiment of the present invention measures the distance to the tip end face of the casting strand ST in the casting direction using the laser distance meter 6, and calculates the measured distance. The length in the casting direction of the casting strand ST from the tip surface in the casting direction of the casting strand ST is calculated based on , and the torch cutter 2 is activated at the timing when the length in the casting direction of the casting strand ST reaches the target length of the casting slab S. Since the cutting of the cast strand ST is started by controlling, the cast slab S having a desired length can be cut with high accuracy without using a measuring roll. That is, according to the casting strand cutting device that is an embodiment of the present invention, since the length of the casting slab S is measured in a non-contact manner using a laser, occurrence of a length measurement error due to a failure of the measuring roll is suppressed. can. Furthermore, since the equipment configuration is simplified, even if a length measurement abnormality occurs, it is only necessary to replace the lightweight laser distance meter, and the continuous casting equipment can be restored in a short time.

Although the embodiments applying the invention made by the present inventors have been described above, the present invention is not limited to the description and drawings that form part of the disclosure of the present invention by the present embodiments. That is, all other embodiments, examples, operational techniques, etc. made by those skilled in the art based on this embodiment are included in the scope of the present invention.

2 Torch cutter 3 Dolly 4 Sensor 5 Purge nozzle 6 Laser distance meter 7 Lifting device 8 Control device 101 Mold 102 Motor 103 Pinch roll 104 Conveyance roll 105 Slab cutting machine 106 Measure roll 107 Pulse generator (PLG)
108 Programming controller (PLC)
109 Connection shaft S Casting slab ST Casting strand

Claims (6)

A casting strand cutting device for obtaining a casting slab by cutting a continuously cast casting strand, comprising:
cutting means for cutting the cast strand while moving in the casting direction of the cast strand in synchronization with the casting speed of the cast strand;
a laser distance meter that is disposed at a position on the downstream side in the casting direction of the casting strand with respect to the movement range of the cutting means, so as to face the tip end surface in the casting direction of the casting strand, and measures the distance to the tip surface in the casting direction; and,
The length in the casting direction of the casting strand from the tip surface in the casting direction is calculated based on the distance measured by the laser distance meter, and at the timing when the length in the casting direction reaches the target length of the casting slab, the length in the casting direction is calculated. control means for controlling the cutting means to initiate cutting of the cast strand;
A casting strand cutting device comprising: The casting strand cutting device according to claim 1, wherein the laser distance meter is disposed on the conveyance path of the casting slab, and includes a retracting means for retracting the laser distance meter from the conveyance path of the casting slab. The casting strand cutting device according to claim 1 or 2, wherein a purge gas is injected to the tip end face in the casting direction. A casting strand cutting method for obtaining a casting slab by cutting a continuously cast casting strand, the method comprising:
Casting of the cast strand is performed at a position downstream in the casting direction of the cast strand from a moving range of a cutting means that cuts the cast strand while moving in the casting direction of the cast strand in synchronization with the casting speed of the cast strand. a measuring step of measuring the distance to the casting direction tip surface using a laser distance meter arranged to face the casting direction tip surface;
The length in the casting direction of the casting strand from the tip surface in the casting direction is calculated based on the distance measured by the laser distance meter, and at the timing when the length in the casting direction reaches the target length of the casting slab, the length in the casting direction is calculated. controlling the cutting means to begin cutting the cast strand;
How to cut cast strands, including: The laser range finder is placed on the transport path of the casting slab, and when the casting slab passes through the position where the laser range finder is placed, the measuring step is completed and the laser range finder is placed on the transport path of the casting slab. 5. The method of cutting a cast strand according to claim 4, wherein the measuring step is started after the casting slab has passed through a position where the laser range finder is placed. The method for cutting a cast strand according to claim 4 or 5, wherein the measuring step is performed while injecting purge gas to the tip surface in the casting direction.

Images