JPH0620596B2 - 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, as shown in FIGS. 6 (a) and (b), a mold 3 is provided below a dandy 2 containing a melt 1, and a dummy bar head fitted in the mold 3. Four
The dummy bar 7 including the head bar 5 having the above and the dummy bar main body 6 connected to the head bar 5 is guided by the guide roller 8 and is moved on the pass line A by the drawing device 9 to be welded to the dummy bar head 4. The cast slab 10 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 back along the pass line A.
And the first and second drawing cylinders 12A and 12B for separately moving the clamp portions 11A and 11B along the pass line A.
The clamp portions 11A and 11B are provided with a lower clamp shoe 13 that abuts the lower surface of the slab 10 and an upper clamp shoe 14 that abuts the upper surface of the slab 10 and is clamped by the lower clamp shoe 13. Cylinder device (not shown) up to the pass line A where the lower clamp shoe 13 matches the lower surface of the slab 10.
After being lifted by the upper clamp shoe 14, the upper clamp shoe 14 is lowered from the set raised position by the upper clamp cylinder 15 to contact the slab 10 for clamping. Then, the first clamp portion 11A clamps the cast slab 10 and the first drawing cylinder 12
After pulling out a predetermined amount by A, the second clamp portion 11B clamps and the cast slab 10 is pulled out by the second pulling cylinder 12B, and this operation is repeated so that 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 main body 6 is used as a common component and various head bars 5 are used. Connected with. Therefore, a taper portion 5a is formed at the base end of the head bar 5 to connect the upper surface of the head bar 5 (the upper surface of the slab 10) and the upper surface of the dummy bar body 6 to 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
Upper clamp shoe 14 can be moved up and down by a required stroke to perform the clan operation, but when clamping the dummy bar body 6, the upper and lower strokes are lifted and clamped.
This causes the upper clamp cylinder 15 that moves up and down 14 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 portions arranged along a pass line, and these clamp portions are alternately arranged along a pass line by a drawing cylinder. In the slab withdrawal device that continuously removes the slab from the mold, the upper and lower clamp shoes that clamp the slab or the dummy bar by the upper and lower clamp cylinders at the clamp parts, and at a predetermined position along the pass line. A clamp control device for driving and controlling the lower clamp cylinder via a lower clamp switching valve, and a position control device for driving the upper clamp cylinder through a position control device and an upper clamp switching valve capable of pressure control, and the upper clamp shoe. The upper clamp cylinder by the signal of the pressure detection sensor that detects the clamp pressure of A pressure control device capable of pressure control driving via a lamp switching valve, and the position control device receives a signal from a shoe position detection sensor that detects the position of the upper clamp shoe, and the previous upper clamp shoe stored in the position memory. Position / pressure switching device that switches the upper clamp switching valve to pressure control by the pressure control device when a position before the clamping position of the upper clamp shoe is detected. When pressure is applied, the clamp position of the upper clamp shoe is stored in the position memory, and the upper clamp shoe is separated from the stored clamp position of the position memory by a predetermined distance when unclamping.

Action In the above configuration, when the cast piece is drawn out, when one of the clamps that clamps the cast piece or dummy par is moved by the draw-out cylinder to reach the position before the end of the draw-out stroke, the lower clamp is controlled by the clamp control device of the other clamp section. The lower clamp cylinder is controlled and driven via the switching valve, and the upper clamp cylinder is position-controlled driven via the position control device and the upper clamp switching valve, and the upper clamp shoe is stored in the position memory to clamp the previous clamp shoe. When the position before the position is reached, the position / pressure switching device switches the upper clamp cylinder from position control drive to pressure control drive via the upper clamp switching valve, and the upper clamp shoe is brought into contact with the slab or dummy bar, Press the slab or dummy bar to the specified pressure with the upper and lower clamp shoes. Clamp with. Then, when the clamp pressure of the upper clamp shoe reaches a predetermined pressure, the position controller stores the clamped position of the upper clamp shoe in the position memory. Further, in the one kun ramp section, the lower clamp shoe is driven, and the upper clamp shoe is moved by a predetermined interval calculated from the previous clamp position stored in the position memory to make the upper and lower clamp shoes stand by.

Embodiment An embodiment of the present invention will be described below with reference to the drawings. 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. 21A and 21 in FIGS. 2 and 3
Reference numeral B denotes a first clamp portion and a second clamp portion 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. The younger brother 1 clamp 21A is a base frame
A first movable frame 24A is movably provided on the roller 22 via a roller 23, and a first lower clamp capable of abutting on the lower surface of the slab 10 and the dummy bar 7 below the pass line A of the first movable frame 24A. The shoe 25A is arranged so as to be able to move up and down, and the first upper clamp shoe 26A that can come into contact with the upper surface of the slab 10 or the dummy bar 7 is arranged so as to be able to move up and down above the pass line A. That is, the first lower clamp shoe
The support member 27 of 25A is arranged in a direction orthogonal to the pass line A, and one end of the support member 27 is rotatably supported by the first movable frame 24A via a pin 28 parallel to the pass line A. At the same time, the other end of the support member 27 is attached to the first movable frame 24.
A first lower clamp cylinder 29A, which is suspended from one side of A, is connected to the load tip of the first clamp cylinder 29A via a pin 30. By driving the first clamp cylinder 29A, a supporting member 27 is formed.
Rotates around the pin 28 and the first lower clamp shoe 25A moves up and down. Further, 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 is connected to the taper portion 5a of the head bar 5. The elevating frame 33 is connected to the rods of the first upper clamp cylinder 34A fixed to the upper part of the first movable frame 24A, and the guides 35 are provided at the four corners of the first movable frame 24A. And is driven by the first upper clamp cylinder 34A to drive the first upper clamp shoe 26 through the elevating frame 33.
A is moved up and down to come into contact with the upper surface of the slab 10 or the dummy bar 7, and the slab 10 or the dummy bar 7 is clamped by the first lower clamp shoe 25A. The second clamp 21B
Second movable frame 24B, second lower clamp shoe 25 of
B, the second upper clamp shoe 26B, the second lower clamp cylinder 29B, the first upper clamp cylinder 34B, and other members are configured similarly to the members of the first clamp portion 21B,
The description is omitted.

36A and 36B are first and second drawing cylinders fixed to the base frame 22, and their operating rods 37A and 37B.
Is connected via the connecting member 38 to the first and first movable frames 24A,
24B are respectively connected to drive the first extraction cylinder 36A in the clamped state of the first clamp portion 21A, and drive the second extraction cylinder 36B in the clamped state of the second clamp portion 21B. 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 electrohydraulic control 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 drawing cylinder 36A to the putter 2 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 cylinder
34A is input to the first position control device 49A for position control driving. The first position control device 49A receives a signal from the first shoe position detection device 50A for detecting the position of the first upper clamp shoe 26A and stores the clamp position of the first upper clamp shoe 26. 51A is connected to the first upper clamp switching valve 53A via the first position / pressure switching device 52A.
Drive position control. An electrohydraulic control servo valve is used for the first upper clamp switching valve 53A, and pressure control is possible. 54A is the clamp chamber of the first upper clamp-n cylinder 34A
In the first pressure control device to which the signal of the first pressure detection sensor 56A for detecting the hydraulic pressure of 55A is inputted, after the first position / pressure switching device 52A is switched, the first upper clamp switching valve 53A
Is controlled to drive the first upper clamp cylinder 34A under pressure control, and when the predetermined clamp pressure is reached, the position of the first upper clamp shoe 26A is stored in the first position memory 51A by the first position control device 49A. Also, this clamp completion signal is transmitted from the first position control device 49A to the central control device 43 via the first clamp control device 47A and the first pull-out control device 44A. Reference numerals 56A, 57A and 58A are amplifiers interposed in the respective lines.

The second withdrawal control unit 41B includes a second withdrawal control device 44B, a second frame position detector 45B, a second withdrawal cylinder 36B, and a second withdrawal cylinder switching valve 46B as the first withdrawal control unit.
The second clamp control unit 42B has a second clamp control device 47B, a second lower clamp switching valve 48B, a second position control device 49B, a second shoe position detection device 50B, and a second shoe position detection device 50B. Position memory 51B, second position / pressure switching device 52B, second upper clamp switching valve 53BB, clamp chamber 55B, second pressure control device 54B, second pressure detection sensor
56B and each amplifier 57B, 58B, 59B have the same configuration as each member of the first clamp control unit 42A, and 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, in order to improve the surface quality of the cast slab 10 that is pulled out from the mold 3, a control signal for pulling out while adding bush back is sent to each pulling out control unit 44A, 44B, and each pulling out The control devices 44A, 44B receive the pull-out cylinder switching valves 46A, 46 in response to the signals from the frame position detectors 45A, 45B and the clamp completion signals from the clamp control units 42A, 42B.
Each drawing cylinder 36A, 36B is driven via B. That is, the first withdrawal cylinder 36A is replaced with the first clamp portion 21A.
When the slab 10 (including the dummy bar 7 hereafter) is clamped to the slab and the pull-out drive (b) is continued from the pull-out start position, the first frame position detector 45A is located at the position before the one push-back stroke at the pull-out end position. The clamp start position is detected and the clamp start signal is sent to the first pull-out control device 44A.
From the central control unit 43 to the second withdrawal control control 44B. Based on this signal, the second pull-out control device 44
The second drawing cylinder 36B at the drawing starting position by B
Is driven synchronously with the first extraction cylinder 36A,
A clamp start signal is sent to the second clamp control device 47B. In response to a command from the second drawing control device 44B, the slab 10 is moved to the second upper and lower clamp shoes 26B and 25B of the second clamp portion 21B.
When clamped at, the second clamp controller 42B sends a clamp completion signal to the first pull-out controller 44A via the second pull-out controller 44B and the central controller 43. This clamp completion signal is further sent to the first Khunlamp controller 47A.
Sent to the first upper and lower clamp cylinders 34A, 29A
After unclamping 10, 10
A is returned from the withdrawal end position toward the starting position (b)
It is made to wait (C). Subsequently, the second clamp part 21B
The slab 10 is clamped to the slab 10 and the slab 10 is pulled out (d). At the position before the end of the squeeze, a clamp start signal is sent from the second clamp portion 21B to the first clamp portion 21A, and the above-described operation is repeated. Are continuously withdrawn.

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

[1] Before the start of casting (1) Position the first movable frame 24A (or the second movable frame 24B) at the extraction start position, and first move the first lower clamp shoe 25A by the first lower clamp cylinder 29A to the upper limit pass line. Raise to A. (The upper and lower strokes of the lower clamp cylinders 29A and 29B are set so that the clamp surfaces of the lower clamp shoes 25A and 25B coincide with the pass line A.) At this time, the second movable frame 24B is at the pull-out start position. To wait.

(2) The first upper clamp switching valve 5 by the first pressure control device 54A
The first upper clamp cylinder 34A is pressure-controlled via 3A to lower the first upper clamp shoe 26A, and the dummy bar 7 is clamped with the first lower clamp shoe 25A at a predetermined clamp pressure.

(3) At this time, the clamp position of the first clamp shoe 25A is detected by the first shoe position detection device 50A and the position memory 51 is detected.
Remember in A.

[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 to the dummy bar head 4 is driven. And then start casting.

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

(3) The second drawing control device 44B controls the second drawing cylinder switching valve 46B to drive the second drawing cylinder 36 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 is input to drive the second lower clamp cylinder 36B via the second lower clamp switching valve 48B to raise the second lower clamp shoe 25B to the upper limit.

(5) Further, according to a command from the second clamp control device 47B, the second position control device 49B drives the position control of the second upper clamp cylinder 34B via the second position / pressure switching device 52B and the second upper clamp switching valve 53B. To do.

(6) When the second upper clamp shoe 26B reaches the set position before the clamp position (hereinafter, the position calculated from the clamp position stored in the second position memory 51B), the second position control device 49B.
The second position / pressure switching device 52B is switched by the signal from the second upper clamp switching valve 53B is pressure controlled by the second pressure control device 54B, and the second upper clamp shoe 26B is lowered and clamped at a predetermined pressure. (This is, for example, the fifth
As shown in the operation explanatory diagram of the upper clamp shoe in the figure, when the unclamping position is set to a distance of 10 mm from the slab 10 (dummy bar 7), the upper clamp shoe is suddenly lowered to a position 2 mm before the slab 10. Since 26A and 26B are switched to pressure control and come into contact with the slab 10, the upper clamp shoes 26A and 26B
The slab 10 can be quickly clamped by the inertial force due to the lowering of 26B without damaging it. (7) When the second pressure detection sensor 56B detects that the hydraulic pressure in the clamp chamber 55B of the second upper clamp cylinder 34B has reached the set clamp pressure, the second pressure control device 54B transfers the second position control device 49B. A clamp complete signal is sent.

(8) The second position control device 49B stores the detection value of the second shoe position detection sensor 50B, which detects the clamp position of the second upper clamp shoe 26B, in the second position memory 51B based on the clamp completion signal, and also performs the clamp. The completion signal is sent to the second clamp control device 47B and the second pull-out control device 44.
B, it sends to the 1st pull-out control apparatus 44A via the central control apparatus 43.

(9) In response to a signal from the first withdrawal control device 44A, the first clamp control device 47A drives the first position / pressure switching device via the first position control device 49A to control the pressure of the first upper clamp cylinder 34A. When the drive is switched to the position control drive, the first upper clamp cylinder 34A is driven via the first upper clamp switching valve 53A to raise the first upper clamp shoe 26A by a predetermined stroke. This stroke is a set value calculated from the clamp position stored in the previous clamp. At the same time, the first lower clamp cylinder 47A is operated by the first lower clamp control device 47A via the lower first clamp switching valve 48A.
Is driven to lower the first clamp shoe 25A.

(10) The first withdrawal control device 44A drives the first withdrawal cylinder 36A via the first withdrawal cylinder switching valve 46A to move the first movable frame 24A from the withdrawal end position to the withdrawal start position, and waits.

(11) The dummy bar 7 clamped by the second upper and lower clamp shoes 26B, 25B is pulled out by the second pull-out cylinder 36B, and the second pull-out is performed based on the detection signal of the second frame position detector 45B at the front position after the pull-out is completed. A clamp start signal is sent from the control device 44B to the first withdrawal control device 44A, and the same operation as above is repeated. Even after the dummy bar 7 has moved and clamped the slab 10, the above operation is repeated until the end of casting.

According to the above embodiment, the dummy bar 7
The clamp position 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 32. Is supported by the upper clamp and shoe
Since 26A and 26B are inclined along the tapered portion 5a and abut against the head bar 5, they can be reliably clamped. Regarding the gradient of this tapered portion 5a, the drawing cylinder
36A, 36B stroke and upper clamp cylinder 34A, 34
The ascending / descending stroke of B and the front position of the clamp are taken into consideration, and the upper clamp shoes 26A, 26B do not come into contact with the taper portion 5a of the head bar 5 during the position control driven lowering of the upper clamp cylinders 34A, 34B.

EFFECTS OF THE INVENTION As described above, according to the present invention, by the position control device, from the standby position where a setting interval is opened from the previous clamp position to the position before the previous clamp position of the upper clamp shoe stored by the position memory. Position control drive of the upper clamp cylinder via the upper clamp switching valve to lower the upper clamp shoe, and pressure control of the upper clamp cylinder via the upper clamp switching valve to clamp from that position to the clamp position. Since unclamping is performed by raising the clamp position by a predetermined distance,
Even when the clamp positions of the dummy bar and the slab are different, the lifting stroke of the upper clamp cylinder can always be minimized, and the time required for clamping the upper clamp cylinder can be shortened. Therefore, since the clamping operation for driving the clamp portions alternately and continuously is performed while the drawing cylinders are synchronously moved, the shorter the time required for clamping, the longer the effective stroke of the drawing cylinders.

[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, 25A …… First lower clamp shoe, 25B…
2nd lower clamp shoe, 26A 1st upper clamp shoe, 26B 2nd upper clamp shoe, 29A 1st lower clamp cylinder, 29B 2nd lower clamp cylinder, 34
A ... 1st upper clamp cylinder, 34B ... 2nd upper clamp cylinder, 36A ... 1st drawing cylinder, 36B ... 2nd drawing cylinder, 47A ... 1st clamp control device, 47
B: second clamp control device, 48A: first lower clamp switching valve, 48B: second lower clamp switching valve, 49A: first
Position control device, 49B ... Second position control device, 50A ... First shoe position detection device, 50B ... Second shoe position detection device, 51A ... First position memory, 51B ... Second position memory, 52A ...... First position / pressure switching device, 52B ...... Second
Position / pressure switching device, 53A ... 1st upper clamp switching valve,
53B: second upper clamp switching valve, 54A: first pressure control device, 54B: second pressure control device, 56A: first pressure detection sensor, 56B: second pressure detection sensor.

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 the slab or dummy bar by the upper and lower clamp cylinders in each of the clamp parts, and drive control of the lower clamp cylinder at a predetermined position along the pass line via the lower clamp switching valve In addition, the upper clamp cylinder is controlled by a position control device and a pressure controllable upper clamp switching valve to perform position control, and a signal from a pressure detection sensor that detects the clamp pressure of the upper clamp shoe causes the upper clamp cylinder to move upward. A pressure control device that can drive the clamp cylinder through the upper clamp switching valve. And when the position control device detects the position before the clamp position of the previous upper clamp shoe stored in the position memory by the signal of the shoe position detection sensor that detects the position of the upper clamp shoe, the upper clamp A position / pressure switching device for switching the switching valve to pressure control by the pressure control device, wherein the position control device determines the clamp position of the upper clamp shoe when the clamp pressure of the upper clamp shoe reaches a predetermined pressure. A slab withdrawal device for horizontal continuous casting equipment, characterized in that the upper clamp shoe is stored in a position memory and is separated from the stored clamp position of the position memory by a predetermined distance when unclamping.