JP2853482B2 - Pouring trough - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a pouring trough for casting molten metal into a mold.

[0002]

2. Description of the Related Art For example, when a cast iron tube is centrifugally cast, a pouring trough 7 is provided inside a rotary mold 6 as shown in FIG.
And casting the molten metal 5 from the triangular ladle 8 into the casting mold 6 through the chute 2 of the pouring trough 7, the solid trough body 1 and the sport 3 at the tip. As shown in FIG. 5, a recess 4 is formed at the bottom of the trough body 1,
An additive supply pipe for supplying an additive into the mold 6 immediately before supplying the molten metal from the sport 3 into the mold 6 is disposed in the recess 4.

After casting the molten metal 5 by using such a pouring trough 7, a blacking liquid comprising an aqueous solution of carbon black and a binder is used for both cooling and coating of the pouring trough 7. From the chute 2 to the trough body 1
Pour over the entire length of the

[0004] However, since the blacking liquid is supplied each time casting is performed, water vapor containing carbon is generated over the entire length of the trough 7, and the working environment becomes extremely poor. There is. In addition, since cooling cannot be performed when the molten metal 5 is being cast, there is a problem that the molten metal flow portion is severely melted and the durability of the trough 7 is poor.

Further, in order to solve such a problem, the present applicant has previously disclosed in Japanese Utility Model Application No. 4-60111 a water cooling jacket 9, 9 on both outer sides of the trough body 1 as shown in FIG. Are formed through the cooling water supply pipes 10 and 10 in the water cooling jackets 9 and 9 so as to be opened at the distal end side of the trough main body 1, and the water cooling jackets 9 and
9 has been proposed to provide a drainage portion from 9 so as to effectively cool the trough body 1.

[0006]

However, even in such a configuration, a water cooling jacket 9 is formed over a wide width in the lower portion of the trough main body 1 to form the concave portion 4 in which the additive supply pipe is arranged. Absent. Therefore, when the molten metal is poured into the trough body 1, only this part thermally expands, and the entire pouring trough 7 is warped, and a spilling boundary occurs on the outer surface of the insertion opening of the centrifugal cast iron pipe during casting. There is a problem that it becomes easier.

Accordingly, an object of the present invention is to solve such a problem and to provide a pouring trough capable of effectively cooling the lower portion of the trough main body and suppressing upward warpage of the entire trough.

[0008]

According to the present invention, a trough body for flowing a molten metal is formed in a U-shape which is open upward, and a rib is formed downward from a lower end of the trough body. A water cooling jacket is provided outside the trough body and the ribs so that the outside of the trough body and the ribs is covered with a cover, and the cooling water contacts substantially the entire surface along the cross section of the trough body and the ribs. It is formed. Further, according to the present invention, the cross section of the trough main body for flowing the molten metal is formed in a U-shape opened upward, the outside of the trough main body is covered with a cover, and an additive supply pipe is arranged in a part of the cover. In order to form a recess, a recess forming member opened downward is arranged, and the cover and the recess forming member are provided outside the trough body by the cover and the recess forming member so that cooling water contacts substantially the entire surface along the cross section of the trough body. A water-cooled jacket is formed.

[0009]

According to the present invention, the rib is projected downward from the lower end of the trough main body, the outside of the trough main body and the rib is covered with a cover, and the cooling water is provided on substantially the entire surface along the cross section of the trough main body and the rib. A water cooling jacket is formed outside the trough body and the ribs so that the ribs are in contact with each other, so that not only is the lower part of the trough effectively cooled by the cooling water, but also the ribs function as an original reinforcing member and cooling fins As a result, more effective cooling and reinforcing effects are exhibited, and the warpage of the trough body can be suppressed, and spills occur on the outer surface of the centrifugal casting pipe during casting. Is prevented. According to the present invention, the trough body is covered with a cover, and a downwardly-opening recess-forming member for forming a recess for arranging an additive supply pipe is arranged in a part of the cover, and the trough body is provided. A water cooling jacket is formed outside the trough body by the cover and the recess forming member so that the cooling water comes into contact with substantially the entire surface along the cross section of the trough. The cooling water can be effectively cooled to suppress the warpage of the trough main body.

[0010]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, a first embodiment of a pouring trough according to the present invention will be described.
This will be described with reference to FIGS. As shown in the figure, the trough main body 11 is formed of a U-shaped member having a relatively thin thickness and a substantially uniform thickness, and a cross section opened upward. A rib 12 protrudes downward from the lower end of the trough body 11. This trough body 11
A cover 13 having an arc-shaped cross section is disposed on the outer side of the trough main body 11.
Are fixed to the upper ends 11a, 11a on both sides by welding portions 14, 14. Thereby, water cooling jackets 15 and 15 are formed on both sides of the trough body 1. The water cooling jackets 15 on both sides are provided at the lower end of the rib 12 and the cover 1.
3 through a gap 16 formed therebetween.

Each of the water cooling jackets 15 is sealed at the distal end of the trough main body 11 and communicates with the box 17 at the base end side of the trough main body 11. The box 17 has a cooling water discharge port 19 formed therein. I have. At the base end side of the trough body 11, a cooling water supply pipe 18 made of copper is inserted from outside the trough through the box portion 17 toward the inside of the water cooling jacket 15. The cooling water supply pipe 18 extends inside the water cooling jacket 15 in the longitudinal direction of the trough main body 11, and opens at the tip end side of the trough main body 11. A water temperature detecting member 20 composed of a thermocouple is disposed at a boundary between the water cooling jacket 15 and the box portion 17, and the water temperature detecting member 20 is connected to an abnormal water temperature alarm device 21.

In such a configuration, the cooling water supply pipe 1
When the cooling water flows through the cooling water 8, the cooling water flows inside the cooling water supply pipe 18 toward the tip side of the trough main body 11, and flows out of the opening of the tip into the water cooling jacket 15. The water cooling jacket 1 outside the cooling water supply pipe 18
5 flows toward the base end side of the trough main body 11, and at that time, the trough main body 11 is cooled. Then, it is discharged out of the system through the discharge port 19 through the box portion 17. It should be noted that if the flow of the cooling water is interrupted and the water temperature becomes abnormally high, an alarm is issued by the abnormal water temperature alarm device 21 so that it is possible to take immediate action.

As described above, since the trough body 11 is cooled over the entire length by the cooling water during and after the casting, the trough body 11 is cooled well, the melting loss of the molten metal flow portion can be reduced, and the generation of steam and the like can be achieved. Is not accompanied. Further, water cooling jackets 15 are formed on both sides of the lower end of the trough main body 11 with the ribs 12 also functioning as cooling fins interposed therebetween, and the cooling water also flows through the gap 16 between the end of the rib 12 and the cover 13. 11 is also effectively cooled by the cooling water.

For this reason, the warping of the trough main body 11 can be suppressed by the cooling action and the inherent reinforcing action of the ribs 12, and during the pouring, the spillage on the outer surface of the insertion opening of the centrifugal cast iron pipe. Is prevented from occurring. Further, since the cooling water supply pipe 18 is open at the tip end side of the trough body 11, it is possible to supply low-temperature cooling water to the tip end of the trough, which tends to become hot because the contact time with the molten metal is relatively long, The tip of the trough body 11 can be effectively cooled.

In the first embodiment, the trough is not provided with a concave portion for arranging an additive supply pipe below the trough. Next, a second embodiment in which the concave portion is formed will be described with reference to FIG. I will explain it.

In FIG. 3, the trough body 11 is formed of a U-shaped member whose cross section is open upward as in the first embodiment, and a cover for forming the water-cooling jacket 15. 13 is covered. A concave portion forming member 22 having a semicircular cross-section, which is opened downward, is formed in the longitudinal direction to form a concave portion in which a center portion of the cover 13 is cut out and in which an additive supply pipe is disposed. A gap 23 is formed between the trough main body 11 and the recess forming member 22, and portions of the water cooling jacket 15 on both sides of the trough main body 11 communicate with each other via the gap 23.

Also in this embodiment, the lower end of the trough main body 11 is effectively cooled by the cooling water in the gap 23, and the upward warpage of the trough main body 11 is suppressed. Next, a specific example will be described. When a cast iron pipe having a diameter of 200 mm is cast using the conventional pouring trough shown in FIG. 4, the end of the sport 3 is warped by about 50 to 65 mm at the end of pouring (at the time of the riser). In the first embodiment, 5-1
0 mm, and in the second embodiment, the warpage was only about 5 mm.

[0018]

As described above, according to the present invention, the rib is projected downward from the lower end of the trough main body, the outside of the trough main body and the rib is covered with a cover, and the cross section of the trough main body and the rib is formed. A water cooling jacket is formed on the outside of the trough body and the ribs so that the cooling water contacts substantially the entire surface along, so that not only the lower part of the trough can be effectively cooled by the cooling water, but also the ribs serve as an original reinforcing member. In addition to functioning as a cooling fin, it can exhibit more effective cooling and reinforcing effects, suppress the warpage of the trough body, and improve the performance of the centrifugal casting tube during casting. It is possible to prevent a situation in which a spilled hot water boundary occurs on the outer surface of the insertion opening. According to the present invention, the trough body is covered with a cover, and a downwardly-opening recess-forming member for forming a recess for arranging an additive supply pipe is arranged in a part of the cover, and the trough body is provided. A water cooling jacket is formed outside the trough body by the cover and the recess forming member so that the cooling water comes into contact with substantially the entire surface along the cross section of the trough. The cooling water can be effectively cooled to suppress the warpage of the trough main body.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view of a pouring trough according to a first embodiment of the present invention.

FIG. 2 is a reduced longitudinal sectional view of the pouring trough of FIG. 1 in plan view.

FIG. 3 is a cross-sectional view of a pouring trough according to a second embodiment of the present invention.

FIG. 4 is a cross-sectional view of a conventional pouring trough.

FIG. 5 is a cross-sectional view of another conventional pouring trough.

FIG. 6 is a diagram illustrating a use state of the pouring trough of FIG.

[Explanation of symbols]

 11 Trough body 12 Rib 13 Cover 15 Water cooling jacket 16 Gap 23 Gap

Continuation of front page (58) Field surveyed (Int.Cl. ⁶ , DB name) B22D 13/10 B22D 35/00

Claims (2)

(57) [Claims] 1. A trough body for flowing molten metal is formed in a U-shaped cross section with an upward opening, and a trough body is formed at a lower end of the trough body .
A rib is projected downward from the trough body and the rib.
Cover the outside of the trough body and the ribs
So that the cooling water touches substantially the entire surface along the cross section of
A pouring trough comprising a water cooling jacket formed outside the trough body and ribs . 2. A cross section of a trough body for flowing molten metal.
It is formed in a U-shape that opens upward, and the outside of this trough body is
Cover with a cover and add a part of the additive
Open downwards to form a recess for placing the feed pipe
A cross-section of the trough body
The cover so that the cooling water contacts substantially the entire surface along
And a water-cooling device outside the trough body
A pouring trough characterized by forming a racket.