JP2930265B2 - Cutting equipment for continuous casting equipment - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cutting device for cutting a slab to a predetermined cutting length while running integrally with a slab continuously produced by a continuous casting facility.

[0002]

2. Description of the Related Art As shown in FIGS. 2 and 5, a cutting device of this type is a slab 5 continuously cast by a continuous casting facility.
Is installed in a continuous casting facility in order to cut into a predetermined length.

When the cutting point is determined by measuring the cutting length determined by the length measuring device 9, the cutting device main body 8 is clamped to a cast piece 5 that is continuously cast as a member to be cut.
The slab 5 is gas cut while moving at a speed synchronized with the casting speed. As described above, the cutting device 8 performs the length measurement of the cutting length of the slab 5, performs the cutting operation while moving integrally with the slab 5, and returns to the original standby position after the cutting to return to the next cutting. Prepare for operation.

[0004] The measurement of the cutting length of the slab to be cut is as follows.
The measurement is performed by the length measuring device 9 installed on the ground side. That is,
A touch roll 9a for rotating a detector to be measured is pressed against the slab 5, and the number of rotations of the touch roll 9a accompanying the movement of the slab 5 is transmitted by a transmitter 9b (a synchro transmitter, a pulse pickup, or the like). The length is measured by a counter which starts counting by a photoelectric switch or the like.

[0005] In response to this length measurement, the cutting device body 8
Is operated by being clamped from a predetermined position to the slab 5 by the clamp 8a, and a gas blowing pipe provided in the cutting device cuts the gas by applying a gas flame to a predetermined cutting location. Therefore, the cutting device body 8 returns to the original standby position (origin) at the end of one cutting operation.
And the cutting cycle became longer.

Therefore, in Japanese Patent Application Laid-Open No. 58-84651, "Cutting Apparatus for Continuous Casting Equipment" (hereinafter referred to as "cutting apparatus"), a length measuring roll is provided on the cutting apparatus main body to measure the length of the slab, and the cutting apparatus main body is provided. It is proposed to find a cutting position at an arbitrary position without returning to the origin, and to shorten the cutting cycle (see FIG. 6).

[0007] The cutting device here is attached to the cutting device body 8.
A length measuring device provided with a transmitter 10b for detecting the length of the slab 5 by pressing the touch roll 10a against the slab 5
At 10, the relative distance between the slab 5 and the cutting device body 8 is measured. When the length measurement signal from the transmitter 10b is compared with the set cutting length, a signal for clamping the cutting device body 8 to the slab 5 and a signal for starting cutting are generated.

[0008] As a method of further improving the cutting accuracy,
Japanese Patent Application Laid-Open No. 63-215354 discloses a "cutting device" (hereinafter referred to as a "cutting device") that uses a transmission laser detector to detect the tip position of a slab while the bogie is stopped at a fixed position. Is measured. Then, a device that starts a cutting operation when a leading end comes to a set position has been proposed.

[0009]

However, in the above-described cutting device, it is necessary to provide the cutting device main body 8 with the touch roll 10a and the transmitter 10b, so that protection measures against radiant heat from the high-temperature slab 5 and lubrication measures are required. A great deal of labor was indispensable for maintenance and management of the equipment. Regarding the accuracy, which is a proposition of the length measuring device 10, the touch roll 10a is not affected by the length measurement error due to the slip with the slab 5 with respect to the transient movement when the cutting device body 8 completes the cutting and returns to the origin. Connect.
In order to avoid the slip length measurement error, it is necessary to increase the pressure at which the touch roll 10a is pressed against the slab 5, and it is difficult to increase the size of the entire apparatus.

[0010] On the other hand, in the above-mentioned cutting device, since the cast slab contact type length measuring instrument tends to cause an error, it is considered that the method is limited to the reference use and most of the method is a non-contact length measuring method. It is necessary to provide a laser slab tip position detecting device (which can travel in the same direction as the truck). In addition, the device becomes complicated, for example, a new problem such as interference between carts occurs. Although the length measurement accuracy is high, the bogie must return to the reference position every time. For example, when cutting out a short product (cutting and removing a material test sample or a defective joint), the cutting cycle cannot keep up with the casting speed. This causes a decrease in production volume such as a decrease in casting speed.

As described above, the cutting device which is aimed at the prior art and has a short cutting cycle can be realized by the above-mentioned conventional structure, but has the following problems and disadvantages as described above.

That is, it is necessary to provide a touch roll and a transmitter for detecting the length of the slab in the cutting device main body.
In addition, since the touch roll must be pressed from above the slab, the touch roll receives more radiant heat from the high-temperature slab than in the method of pressing from below, resulting in inferior durability. In order to prevent this radiant heat, water cooling to the mechanism section and the movable section is required everywhere, so that the entire apparatus has a complicated structure.

Further, a driving device for raising and lowering the touch roll is required, which complicates a mechanism attached to the cutting device main body, presses the touch roll against the cast slab, and separates the transmitter from the cast slab which is less susceptible to radiant heat. And a transmission mechanism such as a chain is indispensable, resulting in poor length measurement accuracy. For maintenance of these driving devices and transmission mechanisms, it is necessary to stop the moving cutting device main body or the continuous casting facility and to provide a scaffold plate or the like on the line.

Further, when the cutting device is moved in the direction of the origin after the cutting of the slab is completed, the touch roll is rapidly rotated at a high speed, so that slippage occurs between the slab and the touch roll. Accurate length measurement may not be possible.

The present invention has been made in view of the above-mentioned circumstances, and has as its object to shorten the cutting cycle without increasing the size and complexity of the cutting device main body, and to achieve an accurate cutting length. An object of the present invention is to provide a cutting device of a continuous casting facility capable of cutting a slab.

[0016]

SUMMARY OF THE INVENTION The present invention is a cutting apparatus for cutting a slab to a predetermined cutting length while running integrally with a slab continuously produced by a continuous casting facility while clamping the slab. A second transmitter for detecting the ground moving distance of the cutting device main body, and a first transmitter for detecting a ground slab moving distance by pressing a touch roll on the slab from the ground, The cutting device compares the transmission value (φ ₂ ) of the _second transmitter and the transmission value (φ ₁ ) of the first transmitter with the slab.
By the moving countercurrent φ = φ ₁ -φ _2, the cutting device and the slab
While moving in the opposite direction , add / subtract by φ = φ ₁ + φ ₂ ,
Relative travel distance of the slab to the cutting device from the start of cutting
(Φ) is compared with the relative moving distance and a set value of a predetermined cutting length, and when the relative moving distance matches the set value, a clamp command and cutting of the cutting device body and the cast piece are performed. And a control unit for giving a start command.

While the cutting device is being clamped on the slab and moving and cutting, the relative moving distance φ = 0 at φ ₁ = φ ₂ , the relative moving distance φ = φ ₁ + φ ₂ during the return movement, and the relative moving distance during standby. φ
= As phi _1, clamp finger to slab of the previous cutting device
Or the relative position of the slab to the cutting device from the starting point of cutting.
The travel distance (φ) is calculated , and the cutting device body returns to the origin direction for the next cutting after the previous cutting is completed. Stop and wait, the relative movement distance (φ)
Is compared with the set cutting length, and clamping and cutting start are performed at the point where they match.

As a result, the problem described above in the section [Problems to be Solved by the Invention] occurs when the cutting device main body is provided with a touch roll and a transmitter for detecting the length of the cast slab. To realize a cutting device that is accurate and has a short cutting cycle.

[0019]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a perspective view of a continuous casting equipment cutting apparatus according to the present invention.

In the cutting device of the present invention (see FIG. 1), the first length measuring device 9 having the touch roll 9a pressed against the slab 5 is used.
Are arranged on the ground as in the prior art, and are pressed against the slab 5 from below. This is advantageous for radiant heat. Further, since the speed of the slab 5 is constant, the slab 5
The touch roll 9a and the slab 5 do not slip even if the pressure applied to the contact is small. Therefore, a large-scale device that generates a large pressure is not required, and the length measuring device 9 itself can be downsized.

Further, in the cutting device of the present invention, the first length measuring device 9 described above is provided, and the cutting device body 8 is further provided.
A second length measuring device 11 for measuring the amount of movement of the vehicle is provided. The second length measuring device 11 can realize accurate length measurement without slippage by using a method such as a gear for the touch roll 11a. Further, the second length measuring device 11
Since it can be placed far enough from the area, there is no need for heat insulation measures.

The cutting operation of the slab 5 by the cutting apparatus of the present invention having such a configuration is performed as described below.

The length of the slab 5 is always measured by the first length measuring device 9 and is added to the differential synchro / digital converter 9c of the comparing section 14 as a rotation angle φ ₁ via a transmitter 9b. It is converted to a two-phase pulse. Then, it is added to the addition / subtraction counter 9d at the next stage, and when a predetermined cutting length is reached, the addition / subtraction counter 9d outputs a cutting command. In response to this cutting command, the cutting device body 8 is clamped by the clamp 8a on the cast piece 5, moves synchronously, and enters a cutting operation. At the same time, the addition / subtraction counter 9d is reset to the initial value, and starts the length measurement operation again by the two-phase pulse of the differential synchro / digital converter 9c.

In the present invention, the amount of movement of the cutting device main body 8 moving during the cutting is measured by the second length measuring device 11 and transmitted by the transmitter.
Through 11b added to the synchro-to-digital converter 11c of the comparator 14 as the rotation angle phi _2, given the difference <br/> dynamic synchro / digital converter 9c via a multiplier 11e.

This differential synchro / digital converter 9c
Is the rotation angle φ ₁ from the first length measuring device 9 and the second length measuring device 11
It calculates the differential between the rotational angle phi ₂ from, and outputs a two-phase pulses commensurate with the answer phi. The arithmetic expression at this time (see FIG. 3) is as follows: slab length φ = φ ₁ +
φ ₂ , φ = φ ₁ −φ ₂ = 0 (∴φ ₁ =
φ ₂ ), return direction φ = φ ₁ + φ ₂ , φ = φ ₁ during standby.

That is, when the cutting device body 8 is cutting and moving synchronously with the slab 5, the polarity is selected in such a direction as to make a differential. ₁ and φ
_{Since 2} must be exactly equal, the answer φ is 0, and the addition / subtraction counter 9d does not count.

However, since the second length measuring device 11 is rotated by a gear or the like as described above, strict φ
₁ = _{φ 2} to not be. As a method for easily avoiding this inconvenience, a multiplier 11e is provided. The multiplier 11e is for multiplying φ by a coefficient for correcting a difference in a detected value (synchro output value) due to a difference between two touch roll diameters or the like. That is, φ ₂ = K · φ ′ ₂ (φ ₂ :
Measured value, K: correction coefficient, φ ' ₂ : measured value), where K
Is obtained by using the fact that φ ₁ = φ ₂ when the cutting cart travels synchronously with the slab clamped, and K = φ ₁ /
sometimes it may be carried out a correction in the φ _'2.

With this configuration, even when the cutting is completed and the cutting device body 8 returns to the origin side, the length of the next cutting is always measured, so that the cutting apparatus 8 is completely returned to the origin. Even if the cutting operation is not performed, the cutting device main body 8 can be stopped halfway and the operation can be shifted to the cutting operation, so that the cutting ability can be kept at the maximum.

In the present invention, the synchro oscillators are used as the oscillators 9b and 11b of the first and second length measuring devices 9 and 11, however, they are resistant to induction noise and the like, and other No error occurs in the measured length value even if wiring is performed on the same route as the power line or the like. The phi ₁ and phi ₂ are differential calculated in absolute value each other. Since this answer φ is converted into a two-phase pulse train and output, a length measuring device that is resistant to noise and highly reliable can be realized. The set value of the predetermined cutting length is preset in the addition / subtraction counter 9d. When the set value is reached, a match command is output to the cutting control device 13 to start a series of cutting operations.

On the other hand, as a modification of the present invention, as shown in FIG.
It is also possible to realize this by performing a synchro / digital conversion of the differential signal φ and then forming a two-phase pulse train. Note The differential synchro transmitter is when transmitting a pulse in response to the rotation, receiving the rotation of the inner ring by the rotation of the contact roll, the rotation of the outer ring rotates in response to the output of phi ₁ (electrically rotating the phase This is a device that outputs the difference between them as φ.

[0031]

As described above, according to the present invention, it is not necessary to return the cutting device body to the origin every time the cutting operation is performed, and the length measurement and the cutting from an arbitrary position can be realized. In addition, by not disposing a complicated length measuring device on the cutting device main body, it is possible to avoid errors during length measurement due to movement and stoppage and to avoid a heat load applied to the length measuring device. The length can be realized with accuracy and high reliability.

[Brief description of the drawings]

FIG. 1 is a schematic view showing a cutting device in a continuous casting facility of the present invention.

FIG. 2 is a schematic view showing a continuous casting facility in which a cutting device is installed.

FIG. 3 is a schematic diagram showing an operation state of the cutting device main body of the present invention.

FIG. 4 is a schematic view showing another embodiment of the cutting device of the present invention.

FIG. 5 is a schematic front view showing a conventional cutting device.

FIG. 6 is a schematic view showing another embodiment of a conventional cutting device.

[Explanation of symbols]

5: Cast piece, 8: Cutting device body, 8a: Clamp, 8b: Drive device, 9: First measuring device, 9a: Touch roll, 9b: Transmitter, 9c: Differential synchro / digital converter, 9d ... Addition / subtraction counter, 11: second measuring device, 11a: touch roll,
11b ... Transmitter, 11e ... Multiplier, 13 ... Cutting control device, 14 ...
Comparison section.

Claims (1)

(57) [Claims] 1. A cutting device for cutting a slab to a predetermined cutting length while running integrally with a slab continuously produced by a continuous casting facility while clamping the slab, and moving the cutting device body to ground. A second transmitter for detecting a distance , a first transmitter for pressing a touch roll against the slab from the ground to detect a slab moving distance to the ground, and transmission of the second transmitter Value (φ ₂ ) and the transmission value (φ ₁ ) of the _first transmitter , the cutting device in the same direction as the slab
During the movement , the cutting device is opposite to the slab due to φ = φ _1- φ ₂
While moving in the direction , add and subtract by φ = φ ₁ + φ ₂ and cut
Relative travel distance of slab to cutting device from start (φ)
A calculation unit for obtaining the, compared with the set value of the relative movement distance and the predetermined cutting length, the clamp instruction and the cutting start command of the cutting device main body and the slab when the relative moving distance matches the set value cutting device of the continuous casting equipment, characterized in that it comprises a control unit providing.