JPH0620597B2 - Slab drawing equipment in horizontal continuous casting equipment - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a drawing device for drawing a cast piece from a mold in a horizontal continuous casting facility.

2. Description of the Related Art In a horizontal continuous casting facility, a mold 3 is provided below a tundish 2 containing a molten metal 1 as shown in FIG.
A dummy bar 7 including a dummy bar head 6 having a dummy bar head 4 fitted in the mold 3 and a dummy bar body 6 connected to the head bar 5 is guided by a guide roller 8 and a pass line A is drawn by a drawing device 9.
The slab 10 that has been moved up and welded to the dummy bar head 4
Is drawn from the mold 3 onto the guide roller 8 to be molded. The pulling device 9 includes first and second clamp portions 11A and 11B arranged in front and rear along the pass line A and first and second clamp portions 11A and 11B which move separately along the pass line A. The upper portion of the clamp portion 11A and 11B has pull-out cylinders 12A and 12B, and the lower clamp shoe 13 contacts the lower surface of the slab 10 and the lower clamp shoe 13 contacts the upper surface of the slab 10. Clamp shoe
14 is provided, and after the lower clamp shoe 13 is lifted by a cylinder device (not shown) to a pass line A coinciding with the lower surface of the slab 10, the upper clamp shoe 14 is moved from the set rising position to the upper clamp cylinder 15 Is lowered by the slab
Abut 10 and clamp. And the first clamp part
11A clamps the slab 10 and pulls out a predetermined amount by the first drawing cylinder 12A, then the second clamp portion 11B clamps and pulls out the slab 10 by the second drawing cylinder 12B.
By repeating this operation, the cast slab 10 is pulled out over the entire length.

Problems to be Solved by the Invention The dummy bar 7 is replaced according to the cross-sectional shape and size of the slab 10 cast by the head bar 5, but the dummy bar body 6 is used as a breast part and various head bars 5 are used. Connected with. Therefore, a tapered portion 5a is formed at the base end of the head bar 5 so that the upper surface of the head bar 5 (the upper surface of the cast piece 10) and the upper surface of the dummy bar body 6 are continuous with each other.

By the way, the upper standby position of the upper clamp shoe 14 is
It is set so that 10 (head bar 5) is located above the dummy bar main body 6 whichever is higher, that is, above the upper surface of the slab 10 by a required distance. Then, the slab 10 (head bar 5
The upper clamp shoe 14 can be moved up and down by a required stroke to perform the clamping operation when the dummy bar main body 6 is clamped. This causes the upper clamp cylinder 15 that moves up and down to perform an unnecessary operation.

SUMMARY OF THE INVENTION The present invention solves the above problems and provides a drawing device in a horizontal continuous casting facility having a clamp section that keeps the lifting stroke of an upper clamp cylinder that lifts an upper clamp shoe properly and does not have unnecessary movement. With the goal.

Means for Solving the Problems In order to solve the above problems, the present invention has a pair of front and rear clamp parts arranged along a pass line, and the clamp parts alternately alternate along the pass line by a drawing cylinder. In the slab withdrawing device that continuously removes the slab from the mold by moving the slab to the upper and lower clamp shoes that clamp the slab or the dummy bar by the upper and lower clamp cylinders, and a predetermined position along the pass line in each of the clamp parts. With the clamp control device for driving and controlling the upper and lower clamp cylinders via the upper and lower clamp switching valves, and a shoe position detection sensor for detecting a distance between the upper clamp shoe and the cast piece or the dummy bar, the clamp control device is provided. During the clamp operation, the shoe position detection sensor allows the upper clamp shoe and the slab or dummy bar to When it is detected that the interval has reached the specified interval, the upper clamp cylinder is temporarily stopped and then pressure-controlled to be clamped, and at the time of unclamping, the shoe position detection sensor causes the distance between the upper clamp shoe and the slab or dummy bar. When it is detected that has reached a predetermined interval, the upper clamp shoe is stopped and made to stand by.

Function In the above configuration, when the cast piece is drawn, when one of the clamps that clamps the cast piece or the dummy bar is moved by the draw cylinder and reaches the position before the end of the draw stroke, the lower clamp is clamped by the clamp control device of the other clamp section. The lower clamp cylinder is controlled and driven via the switching valve, the upper clamp cylinder is controlled and driven via the upper clamp switching valve, and the detection signal of the shoe position detection sensor that detects the distance between the upper clamp shoe and the slab or dummy bar is output. When the set position before the clamp is reached, the clamp controller temporarily stops the upper clamp cylinder via the upper clamp switching valve, then pressure-controls the upper clamp cylinder to bring the upper clamp shoe into contact with the slab or dummy bar, Clamp at a specified clamping pressure with the lower clamp shoe. Then, when unclamping one clamp after the other clamps have completed clamping, the lower clamp shoe is moved by the lower clamp cylinder, and the upper clamp shoe detects the detection signal of the shoe position detection sensor by the upper clamp cylinder. Move the upper clamp shoe until it reaches the set standby position.

Embodiment An embodiment of the present invention will be described below with reference to FIGS. 1 to 5. The same members as those of the related art will be designated by the same reference numerals and description thereof will be omitted.

2 and 3 are a side view and a front view of the slab drawing apparatus. In FIGS. 2 and 3, 21A and
Reference numeral 21B denotes a first clamp portion and a second clamp portion that are movably arranged on the base frame 22 along the pass line A, and the first clamp portion 21A and the second clamp portion 21B have the same configuration. In the first clamp portion 21A, a first movable frame 24A is movably provided on a base frame 22 via rollers 23, and the slab 10 and the dummy bar 7 of the cast bar 10 and the dummy bar 7 are provided below the pass line A of the first movable frame 24A. A first lower clamp shoe 25A capable of abutting on the lower surface is arranged so as to be vertically movable, and a first upper clamp shoe 26A capable of abutting on the upper surface of the pass line A or the upper surface of the dummy bar 7 is vertically movable. It is arranged. That is, the support material 27 of the first lower clamp shoe 25A is arranged in the direction orthogonal to the pass line A, and one end portion of the support material 27 is rotatably moved through the pin 28 parallel to the pass line A. While being supported by the movable frame 24A, the other end of the support member 27 is the first movable frame.
It is connected via a pin 30 to the rod tip of a first lower clamp cylinder 29A that is suspended and attached to one side of 24A,
By driving the first lower clamp cylinder 29A, the support member 27 rotates about the pin 28 and the first lower clamp shoe 25
A moves up and down. The support member 31 of the first upper clamp shoe 26A is swingably connected to the elevating frame 33 on the vertical plane passing through the pass line A via the support pin 32, and the first upper clamp shoe 26A extends along the tapered portion 5a of the head bar 5. The lift frame 33 is connected to the rod of the first upper clamp cylinder 34A fixed to the upper part of the first movable frame 24A.
And the guides 35 provided at the four corners of the first movable frame 24A
Driven by the first upper clamp cylinder 34A, the first upper clamp shoe is moved up and down through the elevating frame 33 to come into contact with the upper surface of the cast slab 10 or the dummy bar 7, and the first lower clamp shoe 26A. Clamp the slab 10 or the dummy bar 7. In addition, of the second clamp portion 21B,
Second movable frame 24B, second lower clamp shoe 25B, second upper clamp shoe 26B, second lower clamp cylinder 29
B, the first upper clamp cylinder 34B, and other members have the same configuration as the members of the first clamp portion 21B, and therefore description thereof will be omitted.

36A and 36B are first and second drawing cylinders fixed to the base frame 22, and their operating rods 37A and 37B are connected to the first and second movable frames 24A and 24 via a connecting member 38.
By respectively connecting to B and driving the first extraction cylinder 36A in the clamped state of the first clamp portion 21A, and driving the second extraction cylinder 36B in the clamped state of the second clamp portion 21B, by performing these alternately, The cast piece 10 can be continuously pulled out from the mold 3.

Next, this cast strip drawing apparatus will be described based on the electro-hydraulic system diagram of FIG.

This device includes a first withdrawal controller 41A and a first clamp controller 42A, a central controller 43, and a second withdrawal controller.
41B and a second clamp control unit 42B are provided, and
The pull-out control unit 41A and the first clamp control unit 42A are the same as the second pull-out control unit 41B and the second clamp control unit 42B, respectively.

In the first pull-out control section 41A, 44A is a central control unit 43.
The first movable frame connected to the first pull-out control device.
The detection signal from the first frame position detector 45A for detecting the position of 24A is input, and the first withdrawal cylinder switching valve 46 is provided in the hydraulic pipe connected to the first withdrawal cylinder 36A.
By controlling A, the first movable frame 24A is controlled and driven by the first extraction cylinder 36A based on a command from the central controller 43 as shown in FIG.

In the first clamp control unit 42A, 47A is a first clamp control device connected to the first pull-out control device 44A.
First lower clamp cylinder via lower clamp switching valve 48A
29A is controlled and driven, and the first upper clamp switching valve 49
The first upper clamp cylinder 34A is controlled and driven via A. Reference numeral 50A is a first shoe position detecting device to which a signal of a first shoe position detecting sensor 51A, such as a magnetic sensor, arranged on the first upper clamp shoe 25A is input.
The distance between the first upper clamp shoe 26A and the slab 10 or the dummy bar 7 is detected. The detection signal of the first shoe position detecting device 50A is sent to the first clamp control device 47A. 52A
Is a pressure regulator interposed in a hydraulic pipe extending from the hydraulic pump to the first upper clamp switching valve 49A.
The hydraulic pressure sent to the first upper clamp cylinder 34A via the first upper clamp switching valve 49A is controlled by the signal from the. 53A
Is an amplifier.

The second withdrawal control device 44B, the second frame position detector 45B, and the second withdrawal cylinder switching valve 46B of the second withdrawal control unit 41B have the same configuration as the respective members of the first withdrawal control unit 41A. 2nd of 2 clamp control part 42B
Clamp control device 47B, first lower clamp switching valve 48B, first upper clamp switching valve 49B, second shoe position detecting device 50
B, second shoe position detection sensor 51B, second pressure regulator
52B and amplifier 53B are the first clamp control unit 42, respectively.
Since it has the same configuration as each member A, the description thereof will be omitted.

Based on FIG. 4, the first and second drawing cylinders 36
The operation of A and 36B will be described. From the central control unit 43, a control signal for pulling out while adding pushback is sent to each pulling control unit 44A, 44B in order to improve the surface quality of the cast piece pulled out from the mold 3, and each pulling control unit 44A and 44B drive the drawing cylinders 36A and 36B via the drawing cylinder switching valves A and B in response to signals from the frame position detectors 45A and 45B and clamp completion signals from the clamp control units 41A and 41B. That is,
The first withdrawal cylinder 36A is attached to the first clamp portion 21A by the slab 10
If the pull-out drive (a) is continued from the pull-out start position with the (including the dummy bar 7) clamped, the first frame position detector 45A moves the clamp start position at the push-back stroke front position of the pull-out end position. A clamp start signal is detected and sent from the first pull-out control device 44A to the second pull-out control device 44B via the central control device 43. Based on this signal, the second withdrawal control device 44B causes the second withdrawal cylinder 36B at the withdrawal start position to move to the first withdrawal position.
While being driven synchronously with the extraction cylinder 36A, a clamp start signal is sent to the second clamp control device 47B. When the slab 10 is clamped by the second upper and lower clamp shoes 26B, 25B of the second clamp portion 21B according to a command from the second pull-out control device 44B, the second clamp control portion 42B sends a clamp completion signal to the second pull-out control device 44B. And to the first withdrawal controller 44A via the central controller 43. This clamp completion signal is further sent to the first clamp control device 47A, and the first upper and lower clamp cylinders 34A and 29A unclamp the slab 10, and then the first drawing cylinder 36A moves from the drawing end position to the starting position. It is returned (B) and made to wait (C). Subsequently, the cast piece 10 is pulled out by being clamped by the second clamp portion 21B (d), and a clamp start signal is sent from the second clamp portion 21B to the first clamp portion 21A at a position before the end of pulling out, and the above-mentioned operation is performed. The slab 10 is repeatedly drawn out and continuously withdrawn.

Next, the operation of the upper clamp shoes 26A and 26B will be described with reference to FIG.

The upper clamp shoes 26A, 26B are in a state in which the slab 10 (or the dummy bar 7) is clamped. Clamp control device 47A, 47B
Is lifted by the command of (a) and separated to the predetermined standby position,
You will be made to wait at that position (b). When the clamp start signal is input to the clamp controllers 47A and 47B, the upper clamp cylinders 34A and 34B lower the upper clamp shoes 26A and 26B (c). During this descent, upper clamp shoes 26A, 26
The position of B is continuously detected by the shoe position detection sensors 51A and 51B and is sent to the shoe position detection devices 50A and 50B, and when the predetermined clamp front position is reached (d),
From the shoe position detector 50A, 50B to the clamp controller 47
A signal is sent to A and 47B to control the upper clamp switching valves 49A and 49B to stop the upper clamp shoes 26A and 26B. Then, the pressure regulators 53A and 53B are controlled to a predetermined hydraulic pressure to operate the upper clamp switching valves 49A and 49B (e), and the upper clamp cylinders 34A and 34B are pressure-controlled to be lowered to hit the slab 10. Contact them (f) and clamp at a specified pressure.

Next, the operation of this device will be described in detail step by step.

[1] Before the start of casting (1) At the extraction start position of the first movable frame 24A (or the second movable frame 24B), first the first lower clamp shoe
25A is raised to the upper limit pass line A by the first clamp cylinder 29A. (Each lower clamp cylinder 29A, 29
The upper limit of the lifting stroke of B is the lower clamp shoe 25A,
The clamp surface of 25B is set so as to coincide with the pass line A. ) At this time, the second movable frame 24B stands by at the extraction start position.

(2) The first clamp shoe 26A is lowered to clamp the dummy bar 7 with a predetermined pressure.

[2] Casting start (1) Based on a signal from the central control device 43, the first drawing control device 44A controls the first drawing cylinder switching valve 46A to drive the first drawing cylinder 36A, and the mold 3
Then, the dummy bar head 4 is pulled out, and casting is started.

(2) The first movable frame 24A moves to move the second clamp portion 21.
When the clamp start position of B is detected by the first frame position detector 45A, a clamp start signal is sent from the first pull-out control device 44A to the second pull-out control device 44B via the central control device 43.

(3) The second drawing control device 44B controls the second drawing cylinder switching valve 46B to drive the second drawing cylinder 36B in synchronization with the first drawing cylinder 36A.

(4) At the same time, the clamp start signal is sent to the second clamp control device 4
7B, the second lower clamp switching valve 48B is controlled to drive the second lower clamp cylinder to raise the second lower clamp shoe 25B to the upper limit.

(5) Furthermore, according to a command from the second clamp control device 47B,
The second upper clamp cylinder 34B is driven via the second upper clamp switching valve 49B to lower the second upper clamp shoe 26B.

(6) When the second shoe position detection device 50B detects the distance between the second upper clamp shoe 26B and the dummy bar 7 by the second shoe position detection sensor 51B and the second upper clamp shoe 26B reaches the clamp front position, the second clamp The control device 47B controls the second upper clamp switching valve 49B to suspend the second upper clamp cylinder 34B.

(7) Further, the second clamp control device 47B is the second pressure regulator 5
2B is controlled to pump the hydraulic pressure to obtain a predetermined clamp pressure, the second clamp switching valve 49B is controlled to drive the second upper clamp cylinder 34B again, and the second upper clamp shoe 26B is lowered to a predetermined level. Clamp with pressure. At this time, the second upper clamp shoe 26B is once stopped and then slightly lowered to come into contact with the dummy bar 7 (cast piece 10).
The descending speed of the second upper clamp shoe 26B can also be controlled by the front position of the clamp, and the second upper clamp shoe 26B can be controlled.
The impact due to the inertial force of B can be relieved and the clamping can be performed at a predetermined clamping pressure. Therefore, during clamping, the dummy bar 7 (cast slab 10) is not damaged by the upper clamp shoes 26A and 26B.

(8) When the clamping is completed, the second clamp controller 47B sends a clamp completion signal to the second pull-out controller 44B and the central pull-out controller 44A by the signal from the second pressure controller 52B. The first pull-out control device 44A instructs the first clamp control device 47A to drive the first vertical clamp cylinders 34A, 29A via the first vertical clamp switching valves 49A, 48A, and the vertical clamp shoe 26.
Unclamp the dummy bar 7 with A and 25A (unclamp). At this time, the first upper clamp shoe 26A is stopped at a predetermined distance from the dummy bar 7 (the slab 10) by the first shoe position detection device 50A based on the set value and made to stand by, and the first upper clamp cylinder 34A is clamped. Strokes are minimized.

(9) The first withdrawal control device 44A controls the first withdrawal switching valve 46A to drive the first withdrawal cylinder 36A, and returns the first movable frame 24A from the withdrawal end position to the withdrawal start position for standby.

(10) The dummy bar 7 clamped by the second upper and lower clamp shoes 26B, 25B is subsequently withdrawn by the second withdrawing cylinder 36B, and the dummy bar 7 is moved to the second position based on the detection signal of the second frame position detector 45B before the withdrawal is completed. Extraction device 44
A clamp start signal is sent from B to the first pulling device 44A, and the same operation as described above is repeated and the clamp portions 21A, 21
The clamp by B moves from the dummy bar 7 to the slab 10, and the slab 10 is continuously withdrawn.

According to the above embodiment, the dummy bar 7
The thickness of the clamp changes from the slab 10 to the slab 10, and the upper clamp shoes 26A, 26B abut the tapered portion 5a at the base end of the head bar 5, but the upper clamp shoes 26A, 26B can swing about the support pin 34. Is supported by the upper clamp shoe 26
A and 26B are inclined along the taper portion 5a and are inclined to the head bar 5
Since it abuts against, it can be reliably clamped.

The pressure regulators 52A and 52B of the above embodiment may be replaced with a source pressure line, or the upper clamp switching valves 49A and 49B.
A hydraulic control servo valve may be used for B.

Advantageous Effects of Invention According to the present invention as described above, according to the present invention, the shoe position detection sensor inputs the detection signal obtained by measuring the distance between the upper clamp shoe and the slab or the dummy bar to the shoe position detection device, and the clamp front position and the standby position. Is reached, a signal is input from the shoe position detection device to the clamp control device, and at the position before the clamp, the upper clamp cylinder is temporarily stopped via the upper clamp switching valve and pressure control drive is performed. The clamp pressure is controlled to prevent the slab from being damaged by the inertial force of the upper clamp shoe.At the standby position, the shoe stops moving when it is separated from the slab or the dummy bar by a predetermined distance, and the clamp position changes. Even if the upper clamp cylinder stroke is always kept to the shortest, from the start to the end of clamping You can shorten the time. Therefore, the clamping operation for alternately and continuously driving the clamping portion is performed while the extraction cylinders are synchronously moved. Therefore, the shorter the time required for clamping, the longer the effective stroke of the extraction cylinder.

[Brief description of drawings]

1 to 5 show an embodiment of the present invention, FIG. 1 is a control system diagram of a cast slab drawing device, FIGS. 2 and 3 are side views and cutaway side views of the same portion, and FIG. FIG. 5 is an operation explanatory view of the drawing cylinder device, FIG. 5 is an operation explanatory view of the upper clamp shoe, and FIG. 6 is a schematic side view showing a conventional horizontal continuous casting facility. 3 ... Mold, 7 ... Dummy bar, 10 ... Cast piece, A ...
… Pass line, 21A, 21B …… First and second clamp parts,
25A, 25B ... First and second lower clamp shoes, 26A, 26
B ... First and second upper clamp shoes, 29A, 29B ... First and second lower clamp cylinders, 34A, 34B ... First and second upper clamp cylinders, 47A, 47B ... First and second Clamp control device, 48A, 48B ... First and second lower clamp switching valve, 49A, 49B ... First and second upper clamp switching valve, 50
A, 50B ... First and second shoe position detecting devices, 51A, 51
B ... First and second shoe position detection sensors, 52A, 52B
...... First and second pressure regulators.

Claims (1)

[Claims] 1. A pair of front and rear clamp parts arranged along a pass line, the clamp parts being alternately moved along the pass line by a drawing cylinder to continuously draw out a slab from a mold. In a slab drawing device, upper and lower clamp shoes that clamp a slab or a dummy bar by the upper and lower clamp cylinders in each of the clamp parts, and drive control of the upper and lower clamp cylinders at predetermined positions along the pass line via the upper and lower clamp switching valves. And a shoe position detection sensor for detecting a distance between the upper clamp shoe and the cast piece or the dummy bar. When it is detected that the distance to the dummy bar has reached the specified distance, The pump cylinder is temporarily stopped and then pressure-controlled to be clamped, and when the shoe position detection sensor detects that the distance between the upper clamp shoe and the slab or dummy bar has reached a predetermined distance during unclamping, the upper clamp shoe is A slab drawing apparatus in a horizontal continuous casting facility, which is configured to stop and wait.