JP2002192331A - Device for filling molten metal into ladle - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a device for filling molten metal into a ladle capable of performing filling the molten metal, without causing leakage of the molten metal in the triangular ladle, from a stationary ladle into the triangular ladle in the centrifugal casting device without confirmation through a visual check by an inspector. SOLUTION: The device for filling the molten metal into the ladle comprises a camera 19 to detect the molten metal surface height inside the triangular ladle 15 through an image data processing, a rotary encoder 22 to detect an inclined angle of the stationary ladle 17, and a molten metal supply suspending means to suspend the supply of the molten metal 16 from the stationary ladle 17 to the triangular ladle 15 even when the molten metal surface height inside the triangular ladle 15 detected by the camera 19 does not reach the allowable upper limit value, in case the inclined angle of the stationary ladle 17 detected by the rotary encoder 22 surpasses the prescribed value.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an apparatus for pouring a ladle.

[0002]

2. Description of the Related Art In a centrifugal casting apparatus for cast iron tubes, a molten metal is generally supplied from a triangular ladle into a rotating metal frame. The supply of the molten metal to the triangular ladle is performed from a stationary ladle having a larger capacity than the triangular ladle. In other words, the triangular ladle can only store the molten metal in an amount that allows several tubes to be centrifugally cast with one metal frame, so when the amount of molten metal inside the Then, the molten metal is supplied from the stationary ladle. That is, the fixed ladle can store a much larger amount of molten metal than the triangular ladle, and directs the molten metal stored therein to this triangular ladle every time the molten metal inside the triangular ladle decreases. It is configured to be able to supply.

At this time, the level of the molten metal inside the triangular ladle is photographed by a camera and image-processed so that an appropriate amount of molten metal can be supplied from the stationary ladle to the triangular ladle. Thus, it is configured to be detectable. That is, the amount of molten metal entering the triangular ladle from the stationary ladle is detected, and thereby the amount of molten metal supplied to the triangular ladle by tilting the stationary ladle is controlled.

[0004]

However, centrifugal casting of cast iron pipes is not always an excellent environment for image processing because steam and dust are generated. For this reason, the obtained data is not 100% reliable, and when it is erroneously detected that the level of the molten metal in the triangular ladle is lower than the actual level, the stationary ladle is placed at the inclination angle or position at which it should originally stop. It will not stop and will continue pouring afterwards. For this reason, in an extreme case, the high-temperature molten metal spills out of the triangular ladle and damages peripheral devices.

[0005] For this reason, conventionally, there is a technical problem that the operator must always confirm the visual check.
Therefore, the present invention solves such a problem and pours molten metal from a stationary ladle to a triangular ladle of a centrifugal casting apparatus without involving visual confirmation by an operator. It is an object of the present invention to be able to perform the operation without causing a spill.

[0006]

According to the present invention, there is provided a centrifugal casting machine comprising: a device for pouring molten metal from a stationary ladle into a triangular ladle; When the inclination angle of the fixed ladle detected by the inclination angle detecting means exceeds a predetermined value. The molten metal for stopping the supply of the molten metal from the stationary ladle to the triangular ladle even if the level of the molten metal level in the triangular ladle detected by the molten metal level detecting means has not reached the allowable upper limit value. And a supply stopping means.

[0007] With this configuration, by detecting the inclination angle of the stationary ladle, the fact that the height of the molten metal level in the triangular ladle has actually reached the upper limit, that is, the note from the stationary ladle, It can be detected that hot water has reached the upper limit at which hot water does not spill from the ladle. At this time, the supply of the molten metal from the stationary ladle is stopped by the molten metal supply stopping means, thereby preventing the spillage from the triangular ladle.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS In FIG. 2, reference numeral 11 denotes a centrifugal casting device for cast iron pipes, and reference numeral 12 denotes a casting cart equipped with a rotating metal frame as a mold. The casting cart 12 is configured so that two pipes can be cast in a single casting operation. Although not shown, two casting frames are provided for this purpose. Two cast metal troughs 13, 13 are arranged in parallel corresponding to these two rotating metal frames,
To supply the molten metal 16 to these pouring troughs 13, a triangular ladle 15 having two pouring ports 14, 14 is provided.

That is, while rotating the metal frame of the casting cart 12 at a high speed, the tips of the pouring troughs 13 and 13 are inserted into the respective rotary metal frames, and the triangular ladle 15 is tilted so that the triangular ladle 15 is tilted. Pour the molten metal 16 out of 15
6 is supplied to the respective metal frames via the pouring troughs 13, 13, so that the cast iron pipe is centrifugally cast inside the metal frames.

The triangular ladle 15 has the advantage that the amount of molten metal 16 supplied to the rotating metal frame is proportional to the tilt angle, so that the amount of molten metal supplied to the rotating metal frame can be accurately controlled. On the other hand, the molten metal 16 can be stored in the triangular ladle 15 only in such an amount that several pipes can be centrifugally cast by one metal frame. Therefore, as shown in FIGS. 1 and 2, the molten metal 16 can be additionally supplied to the triangular ladle 15 from the stationary ladle 17. Reference numeral 18 denotes a spout of the molten metal 16 from the stationary ladle 17.

The level of the molten metal 16 inside the triangular ladle 15 is configured to be detected by image processing using a camera 19 as a level detector. As shown in FIG. 1, the camera 19 is configured so that the level of the molten metal 16 of the triangular ladle 15 can be observed obliquely downward from above to detect the level of the molten metal.

As shown in FIGS. 1-3, a stationary ladle 17
Is configured such that the molten metal 16 can be poured out of the spout 18 into the triangular ladle 15 by tilting around the support shaft 20. Reference numeral 21 denotes a cylinder device as an actuator for tilting the stationary ladle 17 around the support shaft 20. A rotary encoder 2 for detecting the inclination angle of the stationary ladle 17 is provided at a position coaxial with the support shaft 20.
2 are provided.

The molten metal 16 is transferred from the stationary ladle 17 to the triangular ladle 15.
It is necessary to gradually tilt the stationary ladle 17 with the cylinder device 21 when pouring the molten metal. The tilting speed is generally as shown in FIG. That is, at the beginning when the tilting for pouring into the triangular ladle 15 is started, the molten metal 16 inside the stationary ladle 17 has not yet reached the spout 14, but at that time, as shown in the drawing. High-speed operation 25 is performed. That is, the molten metal 16 inside the ladle 17 reaches the spout 14 within a short time. When the pouring is started by this, it is tilted at a low speed by the low speed operation 26 next, and the molten metal 16
To the triangular ladle 15 gently. When the pouring amount approaches the predetermined pouring amount, the tilting speed is further reduced, and pouring is performed in the slow speed operation 27. When the pouring amount reaches the predetermined pouring amount, pouring is finished in a state where there is no excess or shortage.

In accordance with the present invention, while pouring in the pattern shown in FIG.
A method for pouring the molten metal 16 into 5 will be described in detail with reference to FIG.

First, when a fixed ladle tilt command is issued in step S-11, the camera 19 controls the triangular ladle 1
In step S-12, the stationary ladle 17 is tilted at a high speed by the high-speed operation 25 shown in FIG. 4 while detecting the level of the molten metal 16 inside 5. At this time, step S
At -13, it is determined whether the inclination angle of the stationary ladle 17 detected by the rotary encoder 22 is smaller than the stop angle. Here, the stop angle refers to a certain angle within an allowable range in which the molten metal 16 does not overflow from the triangular ladle 15 even if the inclination angle of the stationary ladle 17 becomes that angle.

Hereinafter, this stop angle will be described in detail. That is, the stationary ladle 17 performs pouring to the triangular ladle 15 by gradually increasing its inclination angle, but has a larger capacity than the triangular ladle 15 as described above. The molten metal is poured into the triangular ladle 15 in a plurality of times. At this time, the inclination angle at the time when the previous pouring is completed is known.

On the other hand, the triangular ladle 15 casts a predetermined number of pipes, and when the amount of the remaining molten metal 16 is reduced, the stationary ladle 1
7, the amount of molten metal 16 supplied to the rotating metal frame from the triangular ladle 15 when casting each tube is substantially constant, and the amount of molten metal 16 consumed when casting a plurality of tubes.
Is also approximately constant in proportion to it. That is, the amount of the molten metal 16 to be poured from the stationary ladle 17 to the triangular ladle 15 can be determined based on the number of cast pipes. And the amount of the allowable limit that the molten metal 16 does not overflow from the triangular ladle when pouring like that,
It can be obtained in a similar manner. Therefore, a predetermined pouring amount within this allowable range is set as an allowable pouring amount.

As described above, the inclination angle of the stationary ladle 17 at the time when the previous pouring into the triangular ladle 15 is completed is known, and the allowable pouring amount can be set as described above. It is. Then, a new tilt angle can be easily obtained when it is assumed that the stationary ladle 17 has further tilted from the tilt angle and the allowable pouring amount has been supplied to the triangular ladle 15. This angle is defined as a stop angle. That is, based on the inclination angle of the stationary ladle 17 at the time when the previous pouring is completed, pouring to the triangular ladle 15 is performed in a range where the molten metal 16 does not fall out from the triangular ladle 15 at the next pouring. The maximum allowable inclination angle of the stationary ladle 17 which can be performed is defined as a stop angle.

Returning to FIG. 5, after starting the high-speed tilting of the stationary ladle 17 in step S-12,
In 13, when the inclination angle of the stationary ladle 17 detected by the rotary encoder 22 reaches or exceeds the stop angle, the molten metal 16 supplied to the triangular ladle 15 overflows from the triangular ladle 15. Even if the level of the molten metal 16 detected by the camera 19 has not yet reached the allowable upper limit value, the operation of tilting the stationary ladle 17 in the reverse direction, that is, the descending direction, is performed in step S-21 even if the level of the molten metal 16 has not yet reached the allowable upper limit value. I do. Thereby, the possibility that the molten metal 16 overflows from the triangular ladle 15 and spills out can be eliminated. Usually, at this stage, the molten metal 16 has not been poured out yet, so that step S-13 is a process for safety.

In step S-13, the stationary ladle 17
If the inclination angle of the molten metal 16 does not reach the stop angle, that is, is normal, it is determined whether or not the molten metal 16 has flowed out of the stationary ladle 17 in step S-14. This determination can be easily made based on, for example, whether or not the optically operated molten metal detection switch has been activated. If there is no flow of the molten metal 16, the process returns to step S-13 while maintaining the high-speed tilting operation in step S-12.

If the flow of the molten metal 16 is confirmed in step S-14, the stationary ladle 17 is tilted at a low speed by the low-speed operation 26 shown in FIG. Gently supply the molten metal 16 to the triangular ladle 15. Then, in step S-16, similarly to the case of step S-13, when the inclination angle of the stationary ladle 17 detected by the rotary encoder 22 reaches the stop angle or exceeds the stop angle, step S- At 21, the stationary ladle 17 is tilted in the reverse direction, that is, the downward direction. As a result, the molten metal 16 is
5 can be prevented from overflowing.

In step S-16, the stationary ladle 17
If the inclination angle of the melt does not reach the stop angle, that is, is normal, the supply of the molten metal 16 by the low-speed operation is continued.
At this time, in step S-17, the triangular ladle 15
The level of the molten metal 16 poured into the inside is monitored by the camera 19, and it is determined whether or not the level has reached a constant first set level which is close to a predetermined amount of molten metal poured into the triangular ladle 15. If the first set level has not been reached, step S
Returning to -16, it is determined whether or not the inclination angle of the stationary ladle 17 has reached the stop angle. If it is detected in step S-17 that the molten metal 16 in the triangular ladle 15 has reached the first set level, in step S-18, the stationary ladle 17 is moved at a low speed by the low speed operation 26 shown in FIG. To supply the molten metal 16 from the stationary ladle 17 to the triangular ladle 15 little by little.

Also at this time, in step S-19,
When the inclination angle of the stationary ladle 17 does not reach the stop angle, that is, when it is normal, the supply of the molten metal 16 by the slow speed operation is continued. Similarly, in step S-19,
If the inclination angle of the fixed ladle 17 has reached or exceeded the stop angle, the fixed ladle 17 is set in step S-21.
Is tilted in the reverse direction, that is, the downward direction. Thereby, the possibility that the molten metal 16 overflows from the triangular ladle 15 and spills out can be eliminated.

In step S-19, the stationary ladle 17
When the inclination angle of the molten metal 16 does not reach the stop angle, that is, when it is normal, as described above, the molten metal 16
Supply is maintained. At this time, in step S-20, the molten metal 1 similarly poured into the inside of the triangular ladle 15
6 is monitored by the camera 19 and the triangular ladle 15
It is determined whether or not a predetermined amount of molten metal has been reached, that is, whether or not the molten metal 16 has reached a predetermined second set level. Second
If the set level has not been reached, step S-19
Returning to, it is determined whether or not the inclination angle of the stationary ladle 17 has reached the stop angle.

In step S-20, the triangular ladle 15
If the molten metal 16 inside the container reaches the second set level, that is, reaches a predetermined pouring amount, the stationary ladle 17 is tilted in the reverse direction, that is, the downward direction in step S-21, and there is no excess or shortage. The pouring is finished in the state. Step S
When tilting the stationary ladle 17 in the descending direction at -21, the ladle 17 is tilted to its lower limit for safety as shown in step S-22. If the lower limit is reached, step S
The process ends at -23.

In the above, steps S-17 and S-
The molten metal 1 inside the triangular ladle 15 by the camera 19 at 20
6, the camera 19 is detected as described above.
Are not 100% reliable. In steps S-16 and S-19, the camera detects whether the stop angle has been reached or exceeded based on the inclination angle of the stationary ladle 17 detected by the rotary encoder 22. The reliability of the triangular ladle 15 can be reliably prevented without backing up the reliability of the triangular ladle 19 without the need for a visual confirmation of the operator, which was conventionally required.

[0027]

As described above, according to the present invention, a molten metal level detecting means for detecting the level of the molten metal level in the triangular ladle by image processing, and a tilt angle detection for detecting the tilt angle of the stationary ladle. Means, when the inclination angle of the stationary ladle detected by the inclination angle detecting means exceeds a predetermined value, the height of the molten metal level in the triangular ladle detected by the molten metal level detecting means is an allowable upper limit value. Even if it has not reached, since it has a melt supply stop means for stopping the supply of molten metal from the stationary ladle to the triangular ladle, by detecting the inclination angle of the stationary ladle, It is possible to detect that the height of the hot water surface has actually reached the upper limit, that is, that the hot water has reached the upper limit at the time of pouring from the fixed ladle so that hot water does not spill from the triangular ladle, Stop supply of molten metal from fixed ladle by means of molten metal supply stop By doing so, the molten metal can be poured from the stationary ladle to the triangular ladle of the centrifugal casting apparatus without causing visual confirmation by the operator without causing hot water spillage in the triangular ladle. .

[Brief description of the drawings]

FIG. 1 is a front view of an apparatus for pouring a ladle according to an embodiment of the present invention.

FIG. 2 is a plan view of the pouring device of FIG. 1;

FIG. 3 is an enlarged side view of a stationary ladle in the pouring apparatus.

FIG. 4 is a diagram showing the tilting speed of an identified ladle;

FIG. 5 is a flowchart showing the operation of the casting apparatus.

[Explanation of symbols]

 15 Triangular ladle 16 Molten metal 17 Fixed ladle 19 Camera 22 Rotary encoder

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat ゛ (Reference) F27D 21/00 F27D 21/00 Z G01B 21/22 G01B 21/22 G01F 23/28 G01F 23/28 L ( 72) Inventor Takahiro Tanaka 2-26 Ohama-cho, Amagasaki-shi, Hyogo F-term in Kubota Mukogawa Works (reference) 2F014 AC06 FA04 2F069 AA71 BB40 HH15 4K056 AA06 BA06 CA02 FA17

Claims (1)

[Claims] An apparatus for pouring molten metal from a stationary ladle to a triangular ladle of a centrifugal casting apparatus, wherein the level of the molten metal in the triangular ladle is detected by image processing. Means, a tilt angle detecting means for detecting the tilt angle of the stationary ladle, and if the tilt angle of the stationary ladle detected by the tilt angle detecting means exceeds a predetermined value, it is detected by the molten metal level detecting means Molten metal supply stopping means for stopping the supply of molten metal from the stationary ladle to the triangular ladle even if the height of the molten metal level in the triangular ladle has not reached the allowable upper limit value. Hot water pouring equipment.