JPS6066084A - Tilting furnace device - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a tilting furnace device that taps molten metal by tilting a furnace body, and particularly relates to a tilting furnace device that allows the amount of tapped metal to be well controlled.

A tilting furnace device is generally configured to include a tilting furnace body and a tilting means for tilting the tilting furnace body, and the amount of hot water dispensed is controlled by adjusting the tilting angle of the tilting furnace body by the tilting means. It is about to be done.

By the way, in the past, in order to control the amount of hot water dispensed in ``2'', an operator visually observed the tapped hot water and manually controlled the operation of the tilting means on/off based on the observation result, thereby adjusting the tilting angle of the tilting furnace body. In reality, this was done by adjusting the amount in stages. Therefore, with conventional tilting furnace equipment, it is difficult to maintain the amount of hot water at a desired value, and there are unavoidable inconveniences such as the need for a dedicated worker to adjust the tilting angle of the tilting furnace body. Ta.

On the other hand, as a means of resolving the inconvenience caused by manual control as described above, it is possible to automatically control the sliding angle of the tilting furnace body based on the set hot water output rate.In this case, the actual hot water output rate and the set hot water output rate A means for directly comparing the amount of hot water and controlling the operation of the tilting means on/off so that the actual amount of hot water matches the set amount of hot water based on the comparison result, and a means for controlling the operation of the tilting furnace body based on the set amount of hot water. Determine the standard tilting speed, compare the standard tilting speed with the actual tilting speed, and correct the tilting speed based on the comparison result so that the actual tilting speed matches the standard tilting speed. However, in the case of the former method, good control is difficult due to the large inertia of the sliding furnace body and poor response; Since the inner surface of the part of the tilting furnace body that accommodates the molten metal is usually a complex curved shape similar to the bottom of a pot, the relationship between the amount of hot water tapped and the tilting angle, and the amount of hot water tapped and the standard tilting angle are important. It was not easy to determine the relationship with speed, and it was difficult to put any of them into practical use. Of course, in the latter case, it is possible to determine the standard tilting speed experimentally or by performing complicated calculations, but determining the standard tilting speed in this way requires a great deal of expense. Because it requires a lot of effort,
It is difficult to employ them.

The present invention was made in response to such circumstances, and
The purpose of this is to create a tilting furnace that automatically controls the amount of hot water produced by adjusting the extension movement of the main body and the drawing speed using a relatively simple 3T mechanism. There is something for every offer.

In order to achieve this object, the tilting furnace device according to the present invention has the following features: (1) - The tilting furnace device is tilted by rotation around an axis, and the molten metal contained inside is tapped out from the tap opening. (1) The inner surface of the part that accommodates the metal/8 is approximately cubic to υ, (1) a saw stretching furnace main body, and (2) rotation around the -axis of the tilting furnace main body. (3) a tilting means for detecting the tilting angle and (drawing speed) according to the rotation of the tilting furnace body by the tilting means and outputting a predetermined signal;
(4) Base 111 of the tilting furnace main body based on the preset amount of hot water dispensed and the extension angle signal from the tilting state detection means;
(5) a reference tilting speed calculating means for calculating the four-way speed by 6 times;
The fibrillation speed signal from the supine support detection means and the wff
ipi intermediate speed li: according to the input of the reference speed signal from the i calculation means, the tilting furnace body is rotated by the tilting means so that the amount of hot water output from the tilting furnace body matches the set output amount; The structure includes a tilting control means for controlling the tilting control means.

In this way, if the inner surface of the part of the tilting furnace body that accommodates the molten metal is approximately cubic or rectangular, the relationship between the tilting angle of the tilting furnace body and the amount of molten metal coming out, that is, the relationship between the tilting speed and the amount of metal coming out. can be set relatively economically, and the reference tilting speed can be easily set based on the set hot water output amount. In the present invention, the tilting furnace body is rotated by the tilting means so that the amount of hot water coming out from the tilting furnace body matches the set amount of hot water according to the standards set in this way (the drawing speed and the actual tilting speed). Since the operation is controlled, the amount of hot water discharged from the tilting furnace body can be automatically and favorably controlled based on the set amount of hot water discharged.

Moreover, in the present invention, since the tilting furnace main body can be rotated around one axis, the relationship between the tilting speed of the tilting furnace main body and the operating speed of the tilting means can be determined very easily. In this sense as well, the amount of hot water dispensed can be easily controlled. That is, since the amount of hot water dispensed is actually controlled by controlling the operating speed of the tilting means, the relationship between the tilting speed of the tilting furnace body and the operating speed of the tilting means is determined, and based on that relationship ( It is necessary to convert the drawing speed into an operating speed, and in the present invention, this relationship can be determined very easily by rotating the tilting furnace body around a single axis. .

Hereinafter, in order to clarify the present invention more specifically,
One embodiment thereof will be described in detail based on the drawings.

First, FIGS. 1 to 4 schematically show the structure of a tilting furnace main body and its surroundings of a tilting furnace apparatus according to an embodiment of the present invention.

In those figures, 10 is a hollow tilting furnace main body mainly made of refractory material, and a tap outlet 12 and a burner connection port 14 are fitted in the side wall of the tilting furnace main body 10, although not shown. An inlet for molten metal to flow in, an inspection opening, a cleaning opening, etc. are provided. The tilting furnace main body 10 is supported by a support frame 16 provided around it, and a cylinder 20 provided between the support frame 16 and the base 18 allows the side wall portion opposite to the tapping port 12 to be It is designed to be raised and lowered. Further, a portion of the support frame 16 on the side opposite to the side raised and lowered by the cylinder 20 is rotatably supported by the base 18 by a shaft 22. In other words,
As the cylinder 20 moves up and down, the tilting furnace main body 10 can be rotated around a shaft 22, as shown by the two-dot chain line in FIGS. 3 and 4, and can be tilted by this rotation. This allows the molten metal contained inside to flow out from the tapping port 12.

Note that, as is clear from the above description, in this embodiment, the cylinder 20 is used as a tilting means.

In such a tilting furnace main body 10, the part where the molten metal is accommodated is the part surrounded by the dashed line 24 shown in FIGS. 2 to 4 and the side wall and bottom wall of the tilting furnace main body 10. In the example, as is clear from the figure, the inner surface of this portion is approximately rectangular parallelepiped, and a guide member 26 having a U-shaped cross section is fixed to the outer opening of the tap 12. As is clear from the figure, the spout of the tap 12 for pouring molten metal is aligned with the center of rotation of the tilting furnace body 10. In this embodiment, by setting the pouring ports of the molten metal storage part and the tapping port 12 as described above, the tilting angle of the tilting furnace main body 10 and the tapping port 12 are adjusted as described above.
Relationship between the amount of molten metal coming out from Zunawaji tilting furnace body 1
The relationship between the zero tilting speed and the amount of hot water coming out, and furthermore, the relationship between the amount of hot water coming out and the operating speed of the cylinder, that is, the expansion speed, can be seen very easily.

That is, as shown in FIG. 5, the tilting angle when the tilting furnace body 10 is tilted is θ, the area of the surface of the molten metal at that time is S, and furthermore, due to the small angular change of the tilting angle θ, / If the average water level drop of the 8 hot metals is H, then the amount of molten metal coming out from the tilting furnace body 10 at a tilting angle of 0 is Q
is expressed by the following relational expression, since the amount of melt Q is equal to the amount of change in volume of the molten metal in the tilting furnace main body 10. Here, dH/dt indicates the rate of decrease in the molten metal level.

In this relational expression (1), in this embodiment, the area S of the molten metal surface is determined by the width W of the portion of the tilting furnace body 10 that accommodates the molten metal, as shown in FIG. ,
Furthermore, when the dimensions of each part are determined as shown in FIG. 5, they can be determined by a simple approximation as shown by the following equation (21, +31).

(θ1 <θ≦θ,) where L: Length of the molten metal storage section 2 - Length of the outlet 12 including the guide member 26, above, and the length in the direction parallel to the above) Hl: Molten metal storage Height θ0: Starting tilting angle θ, Draw angle θ2: When the melt surface touches the bottom wall of the tilting furnace main body 10 (Drawing angle θ2: Tilt angle at the end of tapping) The average water level drop H is schematically shown in Figure 6. As shown in , if the amount of extension of the cylinder 20 is X, and the horizontal distance between the cylinder 20 and the side wall on the outlet 12 side of the tilting furnace main body 10 &1[ is Ls, then one pulling angle of the tilting furnace main body 10 is Approximately, within the range where θ varies by a small angle, there is a relationship as follows.

That is, as shown in FIG. 6, if we consider the case where the tilting furnace main body 10, which is currently in the horizontal state shown by the solid line, is moved by a minute angle θ 1 to the position shown by the broken line, the tapping If nothing is done and the molten metal level does not move relative to the moving furnace main body 10, the molten metal level position (water level) before tilting is indicated by the dashed line Hα, and after the tilting is indicated by the broken line Hβ. In other words, the scene position (water level) after tilting is indicated by the two-dot chain line II ′β
The position will be indicated by . And now the water level before tilting)]
Assuming that hot water is dispensed at the same time as the start of movement from α to 1, the amount of water level decrease H when tilting at a minute angle θ is the difference between α and It is expressed as

On the other hand, in FIG. 6, the hot water level position I]α before and after the above-mentioned tilting
, H′β and the side wall of the furnace body 100 around 1 after the extension. It is expressed in a concise manner.

Therefore, the water level decrease amount H is approximately expressed by the following formula (A).

L.

H-(-+L2) ・θ −−−−−−−−−(A
) Also, the extension amount X of the cylinder 20 is x-(LS+L2) ・θ-1--(B)
Since it is expressed approximately as follows, it can be derived from these equations (A) and (B).

Also, as is clear from equation (4), the water level decreasing rate dH
/dt, then dHdx -□ = □ A - A - (5) dt dt (Lx + 2 L2), which is expressed as k - 2 (LS + L 2).

In addition, in the above description, for convenience, the tilting furnace main body 10
is tilted by a small angle from the horizontal position before the start of fibrillation, assuming that hot water is tapped at the same time as the tilting starts, the water level decrease amount H and the extension amount X of the cylinder 20
and the relationship between water level lowering speed dH/dt and cylinder 2
Although the relationship with the extension speed d x / d t of 0 was shown,
Even when the tilting furnace main body 10 is tilted by a small angle from an arbitrary tilting angle θ, the above equations t4) and +5) approximately hold true within the range of the small angle. Furthermore, as is clear from FIG. 4, X in FIG. 6 does not, strictly speaking, match the actual amount of expansion of the cylinder 20, but the error can also be considered to be approximated by equation (4) above. I can do it.

In other words, in this embodiment, when the tilting angle of the tilting furnace body 10 changes by a small angle around 1, the tapping M O, Ir, the tilting angle θ of the tilting furnace body 10 at that time and its) drawing angle θ are determined. According to the extension speed dx/dt of the cylinder 20, it can be expressed by a simple relational expression as follows: be.

Therefore, the expansion speed d)(/dt of the cylinder 20 at each tilt angle θ is calculated based on the set hot water output amount, and the actual expansion speed of the cylinder 20 is the expansion speed d determined by the calculation.
By controlling the cylinder 20 so as to match x/dt, the amount of hot water coming out of the tilting furnace body 10 can be controlled so as to match the set amount of hot water coming out, and in this embodiment, such control is performed. is realized by the control circuit shown in FIG. As is clear from FIG. 6, the extension speed dx/dt of the cylinder 20 has a 1:1 correspondence with the tilting speed dθ/dL of the tilting furnace main body 10, and in this sense, the tilting speed Based on this, it can be said that the amount of hot water discharged from the tilting furnace main body 10 can be controlled.

In FIG. 7, 30 is a digital extension amount/expansion speed detector using, for example, a rank and pinion, and is connected to the lot of the cylinder 20, and is connected to the lot of the cylinder 20, that is, the cylinder 20 of that lot. The expansion amount X and the expansion speed dx/dt are detected, and an expansion amount signal SE of the number of pulses corresponding to the detected expansion amount X,
It outputs a speed signal SS having a magnitude corresponding to the expansion speed dx/dt, and sends these signals to the tilting angle converter 32.
The signal is supplied to a D/A converter 34.

The tilt angle converter 32 includes a counter and receives an extension amount signal SE.
The actual extension amount X of the cylinder 20 at each instant is determined by counting the number of pulses of A one-swing angle signal Sθ representing the instantaneous tilting angle θ is outputted, and is supplied to the display 36 for display, and is also supplied to the reference extension speed calculator 38.

Incidentally, the tilting angle θ can be accurately determined from the extension ff1x of the cylinder 20 by a simple calculation, but the extension amount
It may be approximated by multiplying by a predetermined coefficient.

Further, the D/A converter 34 converts the speed signal SS into an analog signal, and supplies the speed signal SS converted into the analog signal to the expansion speed controller 4o.
to display the actual extension speed d x /d t of the cylinder 20 at each instant.

A hot water output amount setter 44' is connected to the reference extension speed calculator 38, and the hot water output signal SQ does not indicate the amount of hot water set by the hot water setting device 44 and is sent to the reference expansion speed calculator 38. It is now being supplied. In this standard elongation speed calculator 38, the set hot water output amount Q represented by the set hot water output amount signal SQ from the hot water output amount setter 44 and the one-stroke angle signal Sθ from the tilting angle converter 32 are not displayed. Based on the actual tilt angle θ of the main body 10, the above (GL
(The following equation (6)' derived from equation 71, +71': (θ
. ≦θ≦01) (θ1 × θ≦θ2) Accordingly, the reference extension speed dx/dt of the cylinder 2o at each instant can be determined, and the reference extension speed dx/dt at each instant determined in this way The reference decompression speed signal SSR is supplied to the correction circuit 4G without representing the difference.

As mentioned above, as is clear from the fact that the elongation speed d The extension amount/extension speed detector 3o serves as a tilting state detection means. In addition, in this example, specifically, the coefficients of each variable in the formulas (61', (7+'), ie, each coefficient shown below, are set to 1.
．． 2. 3 and the coefficient k shown in equation (5) above can be set and adjusted using digital switches, and by appropriately changing these coefficients from the calculated values, it is possible to compensate for errors caused by the approximation formula. Correctly! It is supposed to be done.

i However, using these coefficients, f61 ′, (7)
'The formula is as follows.

d x / d t = K 1 ・Qcos θ −
flush (6)″(θ.≦θ≦θ1) sinθ cosθ (θ1<θ≦02) The correction circuit 46 includes a level meter 48 and a hot water level setting device 5.
0 is connected. The level meter 48 is provided on the guide trough 52 that guides the molten metal tapped from the tilting furnace main body 10 to a predetermined position, and detects the level of the molten metal flowing in the guide trough 52. First, the level signal SL is supplied to the correction circuit 46. On the other hand, the hot water level setter 50 is for setting the reference level of the hot water level at the installation position of the level B 148, and does not supply the reference level signal SLR representing the set reference level to the correction circuit 46. . The correction circuit 46 receives the level signal QS+ from the level meter 48.

The actual hot water surface level is compared with the base Y (β level) represented by the reference level signal SLR from the hot water level setting device 50, and based on the comparison result, the actual hot water surface level matches the reference level. The reference extension speed calculator 3
The standard stretching speed signal SSR from 8 is corrected, and the corrected standard stretching speed signal SSR' is supplied to the stretching speed controller 1 roller 40.

In this embodiment, the supply of molten metal to the downstream is controlled to be an appropriate amount by matching the actual level of the molten metal to a preset reference level. Therefore, if the flow of molten metal is stopped downstream and the actual level becomes significantly higher than the reference level, the reference elongation speed is automatically set to zero speed based on the comparison result, and the guide trough is This prevents the molten metal from overflowing from the holes 52 and the like. Note that the level signal SL from the level meter 48 is displayed on the display 5.
4, where the actual hot water level in the guide trough 52 at each moment is displayed. Furthermore, as is clear from the above explanation, in this embodiment, the level meter is 4
8 constitutes a hot water level detection means, and a correction circuit 46 constitutes a correction means, respectively.

In the stretching speed controller 40 to which the standard stretching speed signal SSR' corrected by the correction circuit 46 is input, the standard stretching speed signal SSR' is compared with the speed signal SS inputted via the D/A converter 34. , a decompression control signal SC corrected based on the comparison results is output.

This extension control signal SC is supplied to the servo valve 58 via the power amplifier 56 to control the supply of pressure oil from the hydraulic unit 60 to the cylinder 20, thereby controlling the extension speed d of the cylinder 20. x/
dt is controlled, and as a result, the amount of hot water discharged from the tilting furnace main body 10 is controlled to an amount corresponding to the set hot water discharge NQ set by the hot water discharge amount setting device 44. That is, in this embodiment, the extension speed controller 40. Servo valve 5
8 and the like constitute the tilting control means.

As explained above, according to this embodiment, the actual extension speed of the cylinder 20 can be calculated from the fact that the standard extension speed dx/dt of the cylinder 20 according to the set hot water output amount can be determined using an extremely simple approximation formula. By controlling the actual elongation speed of the cylinder 20 to match its standard elongation speed d x / d t by feed-hacking, the amount of hot water discharged from the tilting furnace main body 10 is made to match the desired set amount of hot water discharged. In this case, since the amount of hot water dispensed can be continuously controlled, accurate control can be performed without significantly impairing the control response due to the inertia of the tilting furnace main body 10. be.

Moreover, in this embodiment, the level meter 48 is provided as described above, and the actual hot water level in the guide trough 52 measured by the level meter 48 is compared with the standard level, and the standard elongation is determined based on the comparison result. Since the velocity dx/dt is corrected, there is also the advantage that accidents due to excessive supply of molten metal to the downstream can be prevented.

Incidentally, such a tilting furnace apparatus is effective in continuous casting or semi-continuous casting when molten metal is continuously supplied to a kundish that directly supplies molten metal to a mold. In other words, it is desirable for the amount of molten metal supplied from the tundish to the mold to be constant in most cases, but in that case, since the nozzle diameter of the tundish is generally constant, it is necessary to keep the molten metal water level in the tundish constant. It is necessary to maintain it. In such a case, if the set melt flow rate is set equal to the flow rate of molten metal supplied from the tundish to the mold in the melt flow rate setting device 44 of this embodiment,
Since the water level in the tundish is kept constant, the amount of water supplied from the tundish to the mold is also kept constant. In addition, if the water level at that time is set as the reference level in the hot water level setting device 50, the level signal S does not indicate the hot water level from the level meter 48.
L becomes a kind of feedback signal, and the water level in the tundish is controlled more stably, especially when the supply of molten metal to the mold is temporarily stopped, such as in semi-continuous casting. In such a case, it is possible not only to automatically stop the discharge of metal from the tilting furnace main body 10, but also to keep the molten metal level in the kundish constant, so that even when casting is restarted, the supply of molten metal to the mold can be resumed. This can be done with a stable supply amount.

Although one embodiment of the present invention has been described above, the present invention should not be interpreted as being limited to this embodiment.

For example, in the above embodiment, the inner surface of the molten metal accommodating portion of the driving furnace main body IO was approximately rectangular, but there is no problem even if the inner surface is approximately cubic.
Further, although the tilting furnace main body 10 is a kind of holding furnace in the above embodiment, it may also be a melting furnace.

In addition, in the above embodiment, in order to simplify calculations and reduce the burden on the calculation section, the rotation axis of the tilting furnace body 1o was aligned with the pouring spout of the tap 12; The dynamic axis and the spout do not necessarily have to be aligned, and even if they are not aligned, the output amount, tilting angle (tilting speed), and cylinder 2o The relationship between .

Further, in the above embodiment, the cylinder 2o driven by hydraulic pressure is used as the tilting means, but other devices such as an electric motor may be used, and the pressure oil to the cylinder 2o may be controlled. Although the servo valve 58 was used in the above, it is also possible to use a type of valve such as an electromagnetic flow control valve.

In addition, in the embodiment described above, the amount of extension X and the elongation speed dx/dt of the cylinder 20 are measured, and the tilting angle θ of the tilting furnace main body 10 is determined from the measured amount of extension X, and the tilting angle θ and The standard elongation speed of the cylinder 20 is determined from the set hot water output amount Q, and the elongation speed of the cylinder 20 is further controlled based on the reference elongation speed dx/dt and the actual elongation speed dx/dt measured above. However,
Directly determine the tilting angle θ and tilting speed dθ/dt of the tilting furnace main body 10, and calculate the actual tilting angle θ and the set ratio? Determine the reference tilting speed dθ/dt from AJiQ, determine the control tilting speed dθ/dt based on the determined reference tilting speed dθ/dt and the actual tilting speed dθ/dt, and then calculate the control tilting speed dθ The operating speed of the tilting means such as the cylinder 20 may be determined from /dt, and the tilting means may be operated according to the operating speed. In addition, the tilting speed dθ/d
The relationship between t and the hot water output amount Q and the relationship between the operating speed of the tilting means can be determined by simple approximations.

Furthermore, in the above embodiment, each relational expression is expressed by an approximate expression, and the reference expansion speed of the cylinder 20 is determined according to these approximate expressions. more accurately,
Of course, there is no problem even if the amount of hot water discharged from the tilting furnace body 1o is controlled more accurately, and even in such a case, the calculations do not become so complicated.

In addition, in the embodiment described above, a level meter 48 and a hot water level setting device 50 are provided. and a correction circuit 46 are provided so that the output afA from the tilting furnace main body 10 is continuously corrected so that the actual molten metal surface level matches the reference level. It is also possible to set an upper limit level and a lower limit level, respectively, and perform correction only when the actual hot water level deviates from the level range defined by the upper limit level and lower limit level. The installation position of the guide 48 is not limited to the guide trough 52, and may be installed, for example, on a kundish.

Note that, of course, if there is no need to perform such corrections, it is not necessary to provide them.

Although not listed here, it goes without saying that the present invention can be implemented with various modifications and improvements within the scope of the invention without departing from its spirit.

[Brief explanation of the drawing]

FIG. 1 is a plan sectional view schematically showing an example of a tilting furnace main body of a tilting furnace apparatus according to the present invention, and FIG. FIGS. 3 and 4 are cross-sectional views taken along the line ■-■, respectively. They are an mm sectional view and an IV-IV sectional view. Figure 5 is a schematic diagram for explaining the dimensions of each part of the tilting furnace main body shown in Figures 1 to 4, and Figure 6 is a schematic diagram of the tilting furnace main body shown in Figures 1 to 4. FIG. 7 is a schematic diagram for explaining the relationship between the molten metal water level and the amount of cylinder extension when the tilting angle is slightly changed. FIG. 1 is a block diagram showing one embodiment of the present invention. 10: Tilt furnace body 12: Tap spout 16: Support frame 20 Niji cylinder (tilting means) 22: Shaft 30: Extension amount/extension speed detector (tilting state detection means) 38: Reference extension speed calculator (reference tilting speed calculation means) ) 40: Extension speed controller 56: Power amplifier 58: Zaho valve 60: Hydraulic unit 44: Hot water output amount setting device 46: Correction circuit (correction means) 48 Two-level meter (hot water level detection means) 50: Hot water level setting device Applicant: Sumitomo Light Metal Industry Co., Ltd. Procedures Specialist Hosho (self-proposal) December 7, 1980 1, Indication of the case 1981 Patent Application No. 174834 2, Name of invention tilting furnace device 3, Person making amendment case Relationship Patent applicant name (227) Sumitomo Light Metal Industries, Ltd. 4, Agent 6, Contents of amendment Full text corrected specification 1, Title of invention Tilt furnace device 2, Claims fl) - By rotation around the axis a tilting furnace main body which is tilted to allow the molten metal contained therein to be tapped out from a tap outlet thereof, and whose inner surface shape of the portion that accommodates the molten metal is approximately cubic or rectangular parallelepiped; and the tilting furnace; passive means for rotating the body around the -axis; and tilting state detection means for detecting a tilting angle and a tilting speed according to the rotation of the furnace body by the tilting means and outputting a predetermined signal. and a reference tilting speed calculating means for calculating a reference tilting speed of the tilting furnace body from a preset amount of hot water and a tilting angle signal from the tilting state detecting means, and a tilting speed signal from the tilting state detecting means. and a reference tilting speed signal from the reference tilting speed calculation means, controlling the rotational movement of the tilting furnace main body by the tilting means so that the amount of hot water discharged from the tilting furnace main body matches the set discharge amount. A tilting furnace apparatus comprising: a tilting control means for controlling a tilting furnace. (2) A level detection means for detecting the level of the molten metal discharged from the outlet by tilting the tilting furnace body and outputting a predetermined signal; a correction means for correcting the reference tilting speed signal so that the actual scene level represented by the hot water level signal from the means matches a predetermined set hot water level level; According to the input of the corrected reference tilting speed signal from the tilting state detecting means and the tilting speed signal from the tilting state detecting means, the rotational movement of the tilting furnace main body is controlled. The tilting furnace apparatus according to item 1. 3. Detailed Description of the Invention The present invention relates to a tilting furnace device that taps molten metal by tilting the furnace body, and particularly relates to a tilting furnace device that allows the amount of tapped metal to be well controlled. A tilting furnace device is generally configured to include a tilting furnace body and a tilting means for tilting the tilting furnace body, and the amount of hot water dispensed is controlled by the tilting means at a tilting speed according to the tilting angle of the tilting furnace body. This is done by adjusting the 'By the way, conventionally, the amount of hot water dispensed is controlled by an operator visually observing the amount of hot water dispensed and manually controlling the operation of the tilting means on/off based on the observation result, thereby adjusting the tilting angle of the tilting furnace body. The reality was that adjustments were made in stages. Therefore, with conventional tilting furnace equipment, it is difficult to maintain the amount of hot water at the desired value.
Furthermore, there are inconveniences such as the need for a dedicated worker to adjust the tilting angle of the tilting furnace body. On the other hand, as a means to eliminate the inconvenience caused by manual control as described above, it is conceivable to automatically control the one-stroke angle of the tilting furnace main body based on the set hot water output amount. In this case, means for directly comparing the actual hot water output amount and the set hot water output amount, and controlling the operation of the tilting means on/off based on the comparison result so that the actual hot water output/4ilJ amount matches the set hot water output amount. Then, the standard tilting speed of the tilting furnace body is determined based on the set melt output amount, and the standard tilting speed is compared with the actual tilting speed, and from the comparison result, the actual tilting speed matches the standard tilting speed. One possible method is to continuously control the tilting speed according to the tilting angle of the tilting furnace body while correcting the tilting speed, but in the former case, the inertia of the tilting furnace body is large and the response is slow. Good control is difficult due to poor
In addition, in the latter case, the inner surface of the part of the tilting furnace body that accommodates the molten metal is usually a complicated curved shape similar to the bottom of a pot, so the relationship between the amount of hot water dispensed and the tilting angle is It was not easy to determine the relationship between the amount of hot water and the standard tilting speed, and it was difficult to put any of them into practical use. Of course, in the latter case, it is possible to determine the standard tilting speed experimentally or by performing complicated calculations, but determining the standard tilting speed in this way requires a great deal of expense. It is difficult to employ because it requires labor. The present invention has been made in view of such circumstances, and
The object thereof is to provide a tilting furnace apparatus that can determine the reference tilting speed of the tilting furnace body through relatively simple calculations, and thereby can control the amount of hot water output automatically and satisfactorily. . In order to achieve this object, the present invention relates to (1) a sliding furnace device that is tilted by rotation around an axis, and the molten metal contained inside is (2) a tilting furnace body whose inner surface shape is approximately cubic or rectangular in a portion that accommodates the molten metal to be tapped; and (2) a tilting means for rotating the tilting furnace body around the above-mentioned axis. (3) a tilting state detection means for detecting a tilting angle and a tilting speed according to the rotation of the tilting furnace main body by the tilting means and outputting a predetermined signal; and (4) a preset amount of hot water and the tilting state. (5) a reference tilting speed calculation means for calculating a reference tilting speed of the tilting furnace body from the tilting angle signal from the detection means; and a tilting control means for controlling the rotational movement of the tilting furnace body by the tilting means so that the amount of hot water discharged from the tilting furnace body matches the set discharge amount according to the input with the reference speed signal. In this way, if the inner surface of the part of the tilting furnace body that accommodates the molten metal is approximately cubic or rectangular, then the relationship between the tilting angle of the tilting furnace body and the amount of metal coming out, that is, the tilting The relationship between the speed and the amount of hot water dispensed can be determined relatively easily, and the reference tilting speed can therefore be determined simply based on the set output amount.In the present invention, such a The rotational movement of the tilting furnace body by the tilting means is controlled so that the amount of hot water coming out from the tilting furnace body matches the set amount of hot water according to the standard tilting speed determined by the tilting furnace and the actual tilting speed. Therefore, the amount of hot water discharged from the tilting furnace body can be automatically and effectively controlled based on the set discharge amount.Furthermore, in the present invention, the tilting furnace body can be rotated around a single axis. Therefore, the relationship between the tilting speed of the sliding furnace body and the operating speed of the tilting means can be determined very easily, and in this sense as well, the amount of hot water dispensed can be easily controlled. In other words, the amount of hot water dispensed is actually controlled by controlling the operating speed of the tilting means, so it is necessary to determine the relationship between the tilting speed of the tilting furnace body and the operating speed of the tilting means. It is necessary to convert the tilting speed to the operating speed based on the tilting speed, but in the present invention, this relationship can be determined extremely easily by rotating the tilting furnace body around one axis. Hereinafter, in order to clarify the present invention more specifically,
One embodiment thereof will be described in detail based on the drawings. First, FIGS. 1 to 4 schematically show the structure of a tilting furnace main body and its surroundings of a tilting furnace apparatus according to an embodiment of the present invention. In those figures, 10 is a hollow tilting furnace main body mainly made of refractories, and its side wall has a tap hole 12 and a nozzle connection port 14; An inlet for molten metal to flow into the furnace body 10, as well as an inspection port, a cleaning port, and the like are provided. The tilting furnace main body 10 is supported by a support frame 16 provided around it and a cylinder 20 provided between the support frame 16 and the base 18, which connects the side wall opposite to the tap outlet 12. The part side can be raised and lowered. Further, the portion of the support frame 16 on the opposite side to the side that is raised and lowered by the cylinder 20 is connected to the shaft 2.
2 is rotatably supported on the base 18. In other words, the tilting furnace main body IO moves as the cylinder 20 moves up and down.
As shown by the two-dot chain line in FIGS. 3 and 4, the shaft 22
This rotation causes the molten metal contained inside to flow out from the tap 12. Note that, as is clear from the above description, in this embodiment, the cylinder 20 is used as a tilting means. In such a tilting furnace main body 10, the part where the molten metal is accommodated is the part surrounded by the dashed line 24 shown in FIGS. 2 to 4 and the side wall and bottom wall of the tilting furnace main body 10. In the example, as is clear from the figure, the inner surface of this portion is approximately rectangular parallelepiped, and a guide member 26 having a U-shaped cross section is fixed to the outer opening of the tap 12. As is clear from the figure, the molten metal pouring spout of the tap 12 is aligned with the center of rotation of the tilting furnace body 10. In this embodiment, by setting the molten metal storage portion and the spout of the tap 12 as described above, the tilting angle of the tilting furnace main body 10 and the tap 12 are adjusted as described above.
The relationship between the amount of molten metal coming out from the tilting furnace body 1
The relationship between the zero tilting speed and the amount of hot water coming out, and furthermore, the relationship between the amount of hot water coming out and the operating speed of the cylinder, that is, the expansion speed, can be seen very easily. That is, as shown in FIG.
The tilting angle when tilting is θ, the area of the molten metal surface at that time is S, and the amount of molten metal falling due to a minute change in the tilting angle θ is H. Then, the tilting angle θG is increased (the amount of molten metal coming out from the tilting furnace body 10 is
Since the amount of volume change G of the molten metal within 0 is equal, the following relational expression is given. In addition, here &;:dH'/dt
indicates the rate of decline of the molten metal water level). Then, in relational expression (1) like this, G1 is true 71
In the can example, the area S of the surface of the molten metal is W, which is the width of the tilting furnace body 10 that accommodates the molten metal for 13 minutes, as shown in FIG. When determining the size of : Length G2 of the molten metal storage part: Length of the tap outlet 12 including the guide member 26 (length in the direction parallel to □ above) H: Height θ of the molten metal storage part: Tapping start tilting angle G1 : Tilt angle G2 when the molten metal surface touches the bottom wall of the tilting furnace main body 10 : Tilt angle at the end of tapping Also, the rate of decrease in the molten metal water level dH/dt is calculated between the cylinder 20 and the tilting furnace main body 10 as shown in FIG. When the horizontal distance from the side wall on the outlet 12 side is Ls, and the expansion speed of the cylinder 20 is d x / d t, the following expressions (41, (51), respectively. dH (Ll + 2L2), dx dt 2Rcos θ dt −−−−−−−−−−(41 (θ.≦θ≦θ,) −−−−−−−−−−(5) (θ1 <θ≦θ2) In other words, the tilting angle As shown in FIG. 6, within the range where θ is between θ. Considering the case where the molten metal is tilted, assuming that no tapping is performed and the molten metal level does not move relative to the tilting furnace body 10, the molten metal level position before tilting as shown by the dashed line ( After the tilting, the water level) Hα moves to the position shown by the two-dot chain line I4β.In other words, the hot water level position (water level) after the tilting is the position shown by the broken line H'β.Now, the water level Hα before the tilting is Assuming that hot water is dispensed at the same time as the start of tilting from
It is expressed as the difference between 'β and the water level [Iα before tilting. In addition, in FIG. 6, the scene position Hα before and after the tilting,
The trapezoidal part formed by H'β and the side wall of the tilting furnace main body 10 after tilting has a short side length L2Δθ/cos θ
, the length of the long side is approximately expressed as (Ll +L2)Δθ/cos θ. Therefore, the water level decrease amount ΔH is approximately expressed by the following equation (A). In other words, the tilt angle θ is θ. Within the range between
It can be expressed as 2l-z −= −−−−−(A)′ dθ 2 cos θ. On the other hand, when the tilting angle θ is between θ1 and θ2, consider the case where the tilting furnace main body IO with the tilting angle θ is tilted by a small angle Δθ, as shown in FIG.
The cross-sectional area of the '/M hot water that is dispensed by tilting at a minute angle θ is represented by a rectangle abcd in FIG. in this case,
The lengths of ab, cc'' and cld' in Figure 7 are shown in (B), respectively. Formulas (C) and (D): % formula % () Since the water level reduction amount Δ■1 is expressed as follows (E ) is given approximately by the equation υ.In other words, within the range where 1 pulling angle θ is between θ and θ2, the water level reduction amount I] can be expressed by the tilting angle θ. Let the amount of extension of the cylinder 20 be X, and the tilting furnace main body 10
If the displacement amount of the extension MX according to 〇 to the minute tilt angle of
Approximately, Δx=R・80 −, −(F ) However, since R=r 〒7 〒7 〒6〒 〒, the tilting speed dθ/ of the tilting furnace body 10 is
The following equation approximately holds true between dt and the expansion speed dx/dt of the cylinder 20. dt Rdt In other words, the water level lowering speed d H/d t depends on the extension speed d x / d t of the cylinder 20, and dHdHdθ
It can be expressed as dH1dx dt dθ dt dθ Rdt −1−−−−・(G), and the above (A
)' and (B)', the above (
Equations (4) and (5) can be derived. Incidentally, as is clear from FIG. 4, strictly speaking, the amount of expansion X of the cylinder 20 does not match the actual amount of expansion of the cylinder 20, but the error can also be approximated by the above equation (F). I can think. In other words, in this embodiment, the tapping iQ when the tilting angle of the tilting furnace body 10 changes by a small angle is determined by the tilt angle θ of the tilting furnace body 10 at that time and the extension speed d x / of the cylinder 20 at that tilting angle θ. d t can be expressed by a simple relational expression such as (θ.≦θ≦θ,) −−−−−−−−−−(71 (θ□<θ≦θ2). Therefore, the extension speed dx/dt of the cylinder 20 at each tilt angle θ is determined based on the set hot water output amount, and the cylinder 20 is
The actual stretching speed of 0 is the calculated stretching speed d
By controlling the cylinder 20 so as to match x/dt, the amount of hot water coming out of the tilting furnace body 1o can be controlled so as to match the set amount of hot water coming out, and in this embodiment, such control is performed. is realized by the control circuit shown in FIG. Note that, as is clear from the above explanation, if the extension speed dx/dt of the cylinder 20 is the tilting speed d of the tilting furnace main body 10,
θ/dt corresponds to 1:1, and in this sense it can be said that the amount of hot water discharged from the tilting furnace main body 10 can be controlled based on the tilting speed. That is, in FIG. 8, 30 is a digital extension amount/extension speed detector using, for example, a rack and pinion, which is connected to the rod of the cylinder 20 and measures the extension of the rod, that is, the cylinder 20. The amount of expansion X and the expansion speed dx/dt are detected, and an expansion amount signal SE of the number of pulses corresponding to the detected expansion amount X,
It outputs a speed signal SS having a magnitude corresponding to the expansion speed dx/dt, and sends these signals to the tilting angle converter 32.
The signal is supplied to a D/A converter 34. The tilt angle converter 32 includes a counter and receives an extension amount signal SE.
The actual extension amount X of the cylinder 20 at each moment is determined by counting the number of pulses, and from the obtained extension amount X, the tilting furnace main body 1
0 at each instant, outputs a tilt angle signal Sθ representing the tilt angle θ at each instant, supplies this to the display 36 for display, and sets the standard extension speed. The signal is supplied to the arithmetic unit 38. Incidentally, the tilting angle θ can be accurately determined from the extension amount X of the cylinder 20 by a simple calculation, but it may also be approximated by multiplying the extension amount X by a predetermined coefficient. Further, the D/A converter 34 converts the speed signal SS into an analog signal, and supplies the speed signal SS converted to the analog signal to the expansion speed controller 40.
to display the actual extension speed d x /d t of the cylinder 20 at each instant. A hot water output amount setting device 44 is connected to the reference extension speed calculator 38, and a set hot water output amount signal SQ representing the amount of hot water set by the hot water output amount setting device 44 is sent to the reference expansion speed calculator 38.
is being supplied to. The reference elongation speed calculator 38 calculates the set melt flow rate Q represented by the set melt flow rate signal SQ from the hot water flow rate setting device 44 and the tilting furnace main body construction represented by the tilt angle signal Sθ from the tilt angle converter 32. 0
Based on the actual tilt angle θ of (61, (71
The following equation (61', (71":----
--(61' (θ.≦θ≦θ□) ----------(71'(θ1<θ≦θ2) According to The quasi-elongation rate d x at each instant determined in this way is
/dt, and the reference expansion speed signal SSR is supplied to the correction circuit 46. As mentioned above, as is clear from the fact that the elongation speed d The device 38 constitutes a reference tilting speed calculating means, and the extension amount/extension speed detector 30 constitutes a tilting state detecting means. In addition, in this example, specifically, the coefficients of each variable in the formula (6) "171'", that is, each coefficient not shown below, is 1. to 2.
．． 3 and 4 can be set and adjusted by digital switches, respectively, and by appropriately changing these coefficients from the calculated values, it is possible to correct errors caused by the approximation formula. (1-1+2L2) L□W R K2 =□ K3 =) If 2 = 4 = L2 Also, using these coefficients, +61', (71
'The formula is as follows. d x/d t-=□Q cos2 θ −−−−−
---(61″1(θ.≦θ≦θ□) sin2 θ cos 2 θ (θ1<θ≦θ2) The correction circuit 46 includes a level meter 48 and a hot water level setting device 5.
0 is connected. The level meter 48 is provided on the guide trough 52 that guides the molten metal tapped from the tilting furnace main body 10 to a predetermined position, and detects the level of the molten metal flowing in the guide trough 52. A level signal SL representing this is supplied to the correction circuit 46. On the other hand, the hot water level setter 50 is for setting the reference level of the hot water level at the installation position of the level meter 48, and converts the reference level signal SLR representing the set reference level into the correction circuit 4.
Supply to 6. Then, the correction circuit 46 compares the actual scene level represented by the level signal SL from the level meter 48 and the reference level represented by the reference level signal SLR from the hot water level setting device 50, and based on the comparison result, The standard stretching speed signal SSR from the standard stretching speed calculator 38 is corrected so that the actual 'tk plane level matches the reference level, and the corrected standard stretching speed signal SSR" is supplied to the elongation speed controller 40. That is, in this embodiment, by matching the actual molten metal level with a preset reference level, the molten metal is supplied to the downstream in an appropriate amount. If the flow of molten metal is stopped downstream and the actual level becomes significantly higher than the standard level, the standard elongation rate will be adjusted based on the comparison result. is automatically set to zero speed to prevent the molten metal from overflowing from the guide trough 52, etc.The level signal SL from the level meter 48 is displayed on the display 5.
4, where the actual hot water level in the guide trough 52 at each moment is displayed. Furthermore, as is clear from the above explanation, in this embodiment, the level meter is 4
8 constitutes a hot water level detection means, and a correction circuit 46 constitutes a correction means, respectively. In the stretching speed controller 40 to which the standard stretching speed signal SSR' corrected by the correction circuit 46 is input, the standard stretching speed signal SSR' is compared with the speed signal SS inputted via the D/A converter 34. , a decompression control signal SC corrected based on the comparison results is output. This extension control signal SC is supplied to the servo valve 58 via the power amplifier 56 to control the supply of pressure oil from the hydraulic unit 60 to the cylinder 20, thereby controlling the extension speed d of the cylinder 20. , x /
dt is controlled, and as a result, the amount of hot water discharged from the tilting furnace main body 10 is controlled to an amount corresponding to the set hot water output amount Q set by the hot water rate setting device 44. That is, in this embodiment, the extension speed controller 40. The servo valve 58 and the like constitute a tilting control means. As explained above, according to the present embodiment, since the standard extension speed dx/dt of the cylinder 20 according to the set hot water output amount can be determined using an extremely simple approximation formula, the actual extension speed of the cylinder 20 can be calculated using the feed bank. By controlling the actual elongation speed of the cylinder 20 to match the reference elongation speed dx/dt, the amount of hot water discharged from the tilting furnace main body 10 is automatically adjusted to match the desired set amount of hot water. In this case, since the amount of hot water discharged can be continuously controlled, accurate control can be performed without significantly impairing control responsiveness even due to the inertia of the tilting furnace main body 10. Moreover, in this embodiment, the level meter 48 is provided as described above, and the actual hot water level in the guide trough 52 measured by the level meter 48 is compared with the standard level, and the standard elongation is determined based on the comparison result. Since the velocity dx/dt is corrected, there is also the advantage that accidents due to excessive supply of molten metal to the downstream can be prevented. Incidentally, such a tilting furnace apparatus is effective when used in continuous casting or semi-continuous casting to continuously supply molten metal to a tundish that directly supplies molten metal to a mold. In other words, it is desirable for the amount of molten metal supplied from the tundish to the mold to be constant in most cases, but in that case, since the nozzle diameter of the tundish is generally constant, it is necessary to keep the molten metal water level in the tundish constant. It is necessary to maintain it. In such a case, if the set melt flow rate is set equal to the flow rate of molten metal supplied from the tundish to the mold in the melt flow rate setting device 44 of this embodiment,
The water level in the tundish is always kept constant, and the amount of water supplied from the tundish to the mold is also always kept constant. In addition, if the water level at that time is set as the reference level in the hot water level setting device 50, the level signal S does not indicate the hot water level from the level meter 48.
' L becomes a kind of feed bank signal, and the water level in the tundish is controlled more stably, especially when the supply of molten metal to the mold is temporarily stopped, such as in semi-continuous casting. In such cases, it is possible not only to automatically stop the tapping of the metal from the tilting furnace main body 10, but also to maintain the molten metal level in the tundish at a constant level.
Even when casting is restarted, molten metal can be supplied to the mold again at a stable supply rate. Although one embodiment of the present invention has been described above, the present invention should not be interpreted as being limited to this embodiment. For example, in the embodiment described above, the inner surface of the portion of the tilting furnace body 10 that accommodates the molten metal is approximately rectangular, but there is no problem with the shape being substantially cubic. In the embodiment, a type of holding furnace was used, but it may also be a melting furnace. In addition, in the above embodiment, in order to simplify calculations and reduce the burden on the calculation section, the rotation axis of the tilting furnace body 10 and the pouring spout of the tap 12 were made to coincide. The moving axis and the spout do not necessarily have to be aligned, and even if they are not aligned, the amount of hot water dispensed, the tilting angle (tilting speed), and the extension of the cylinder 20 can be adjusted. The relationship with speed can be easily found as a relatively simple relational expression, and the object of the present invention is achieved. Furthermore, in the embodiment described above, the cylinder 20 driven by hydraulic pressure was used as the tilting means, but other devices such as an electric motor may be used, and the pressure oil to the cylinder 20 may be controlled. Although the servo valve 58 was used in this case, other types of valves such as electromagnetic flow control valves may also be used. Further, in the above embodiment, the amount of elongation and the elongation speed of the cylinder 20 are measured, and the amount of elongation is determined based on the measured amount of elongation.
The cylinder 200 standard extension speed is determined from the tilt angle and the set hot water output amount, and the cylinder 20 extension speed is controlled based on the standard extension speed and the measured actual extension speed. However, the tilting angle and tilting speed of the tilting furnace main body 10 are directly determined, the standard tilting speed is determined from the actual tilting angle and the set hot water output amount, and the determined standard tilting speed and the actual tilting are calculated. The control tilting speed may be determined based on the speed, and the operating speed of the tilting means such as the cylinder 20 may be determined from the controlled tilting speed, and the single pulling means may be operated in accordance with the operating speed. Note that the relationship between the tilting speed and the amount of hot water dispensed and the relationship between the operating speed of the tilting means can be determined by a simple approximate equation. Furthermore, in the embodiment described above, each relational expression was expressed by an approximate expression, and the reference elongation speed of the cylinder 20 was determined according to these approximate expressions. Of course, there is no problem even if the amount of hot water discharged from the tilting furnace body 10 is controlled more accurately by setting the value more accurately, and even in such a case, the calculations do not become so complicated. . In addition, in the embodiment, a level meter 48 and a hot water level setting device 50. and a correction circuit 46 are provided so that the amount of hot water discharged from the tilting furnace body 10 is continuously corrected so that the actual scene level matches the reference level. It is also possible to set a level and a lower limit level respectively, and perform correction only when the actual hot water level deviates from the level range defined by the upper limit level and lower limit level.
The installation position of 8 is not limited to the guide l1ff+52, but may be installed on the tundish, etc., for example. Note that if there is no need to perform such corrections, it is of course unnecessary to provide them. Although not listed here, it goes without saying that the present invention can be implemented with various modifications and improvements within the scope of the spirit thereof. 4. Brief Description of the Drawings FIG. 1 is a plan sectional view schematically showing an example of the tilting furnace main body of the tilting furnace apparatus according to the present invention, and FIG. FIG. 3 and FIG. 4 are respectively n-11 sectional views thereof. They are a -■ cross-sectional view and an IV-TV cross-sectional view. FIG. 5 is a schematic diagram for explaining the dimensions of each part of the stretching furnace body shown in FIGS. 1 to 4, and FIGS. 6 and 7 are shown in FIGS. 1 to 4, respectively. Fig. 8 is a schematic diagram for explaining the amount of change in the molten metal water level when the tilting furnace body is slightly changed in tilting angle. FIG. 1 is a block diagram showing one embodiment of the present invention. 10: Tilt furnace main body 12: Tap spout 16: Support frame 20 Niji cylinder (tilting means) 22: Axis 30: Extension amount/extension speed detector (tilting state detection means) 38 Two reference extension speed calculator (reference tilting speed calculation means) ) 40: Extension speed controller 44: Hot water output amount setter 46: Correction circuit (correction means) 48: Level meter (hot water level detection means) 50: Hot water level setting device 56: Power amplifier 58: Serpo hub 60: Hydraulic unit No. 5 figure

Claims (1)

[Scope of Claims] (11-The inner surface of the part that accommodates the molten metal, which is tilted by rotation around an axis and is tapped from the tap opening of the part that accommodates the molten metal, is approximately cubic or A tilting furnace body having a rectangular parallelepiped shape, a tilting means for rotating the tilting furnace body around the axis, and a tilting angle and a tilting speed according to the rotation of the tilting furnace body by the tilting means. a tilting state detection means for detecting and outputting a predetermined signal; and a reference tilting speed calculation for calculating a reference tilting speed of the tilting furnace body from a preset amount of hot water and a tilting angle signal from the tilting state detection means. means, and according to the input of the 1st rotation speed signal from the tilting state detection means and the reference tilting speed signal from the reference tilting speed calculation means, the amount of hot water coming out from the tilting furnace body matches the set amount of hot water coming out. A tilting furnace apparatus comprising: fibrillation control means for controlling the rotational movement of the tilting furnace body by the tilting means. scene level detection means for detecting the scene level of molten metal and outputting a predetermined signal; and a predetermined set water level level in which the actual melt level represented by the surface level signal from the scene level detection means is determined in advance. and a correction means for correcting the reference tilting speed signal so as to match the reference tilting speed signal, and the first verb control means receives the corrected base 'f' from the correction means.
Claim 1, wherein the rotational movement of the tilting furnace body is controlled in accordance with the input of the t-tilting speed signal and the tilting speed signal from the tilting state detection means. Tilt furnace equipment.