JP2007534503A - Closure of discharge channel in metal casting vessel - Google Patents

Abstract

The present invention relates to a cock device (2) of the type attached to the bottom (1) of a metal casting container having an opening, wherein a channel (4) communicating with the opening provided in the bottom is provided, (4) a channel body (3) having laterally symmetric recesses (5) extending across the side, and attached to the recesses (5) and traversing the depth of the channel (4) A rotatable closing body (6) having a hole (7), and the hole (7) opens and closes the channel (4) when the closing body (6) rotates. . In order to achieve the improvement, the end (8) of the closure (6) is hinged to the bottom (9) of the recess (5) and the contact surface between the closure (6) and the recess (5) is It is rotationally symmetric and is smaller than the rotational surface of the recess (5).

Description

  The present invention is a cock device attached to the bottom of a metal casting container having an opening, wherein a channel communicating with the opening provided in the bottom is penetrated, and a rotationally symmetric recess extending across the channel is provided. A channel body provided on the side, and a rotatable closing body attached to the recess and having a transverse hole in the deep part of the channel. When the closing body rotates, the hole opens and closes the channel. It is related with the said cock apparatus.

  Conventionally, a plug has been used as a closing body for closing a casting conduit starting from the bottom of a casting vessel containing molten metal, and the plug is connected to a lifting rod extending across the surface of the molten metal to move up and down. Yes. The difficulty is that when the molten metal is lowered and the conduit is closed, it is difficult for the plug to catch the casting hole. In addition, the plug quickly worn during use.

Due to these problems, as disclosed in Patent Document 1, the plug of the casting hole was later replaced with a sliding closing unit. In a sliding closure unit, a horizontal plate that rotates about a vertical axis is placed in contact with the lower end of a vertical casting conduit, the plate has an opening, to open the conduit. To make the opening adjacent to the end of the conduit and to close the conduit, the plate is rotated to disengage the opening from the conduit. The plate forming the sliding type closing unit is supported by a large frame, and the plate is rotated through the frame. Such a structure is difficult to manufacture and is cumbersome and unreliable.
Finnish Patent Application Publication No. 92022

A closed valve type solution similar to the present invention is also suggested. These are known from publications such as Patent Document 2 (FIGS. 1 and 2), Patent Document 3 (FIG. 5), Patent Document 4 (FIGS. 1 and 4), and Patent Document 5 (FIG. 3). . However, their problem is that they do not function at high temperatures. Therefore, Patent Document 5 suggests that the closing valve is used mainly for light alloys that are easily melted.
British Patent Application Publication No. 183,241 U.S. Pat. No. 4,905,876 U.S. Pat. No. 4,913,324 US Pat. No. 4,557,462

  An object of the present invention is to provide a cock device that is attached to the bottom of a metal casting container having an opening and that functions well at the high temperatures required for metal casting without the disadvantages of the closures described above. That is.

  As described above, the cock device according to the present invention includes a channel main body having a channel communicating with the bottom opening of the metal casting container and having a rotationally symmetric recess extending across the channel on the side. Consists of The rotatable closure has a transverse hole in the deep part of the channel, matching the recess, and can be rotated in the same or different direction with respect to the channel to open and close the cock. In order to achieve the improvement of the cock device, the end of the closing body is hinged to the bottom of the recess and the contact surface between the closing body and the recess is rotationally symmetric, compared to the rotation surface of the recess It is getting smaller.

  The concept of “hinge connection” means that when the end of the closure is aligned with the bottom of the recess and rotated, the closure is otherwise essentially left in place. The contact surface between the closing body and the recess refers to a surface having contact between the outer surface of the closing body and the inner surface of the recess when the end of the closing body matches the bottom of the recess.

  Therefore, it is recognized that a closed valve type metal casting cock works well at high temperatures if the hole in the closure is aligned with the molten metal discharge channel and its sealing surface is symmetrical and has a small surface area. It was. The closing body is, for example, cylindrical or conical, and its end is hinged to the bottom of the recess in the channel body, and the recess has the same shape. The holes in the closure are easily maintained in alignment with the channels in the channel body. Thus, when the holes are aligned with the channels, a significantly smaller contact surface between the pin and the recess can be used compared to the rotational surface of the recess. Since the contact surface is small, the heat transfer is controlled and the temperature of the control device does not rise excessively.

  The seal contact surface is preferably 10-80% of the rotational surface, most preferably 20-70%. The contact surface is in a region starting from the bottom and ending at the recess, which is between the channel and the outer edge of the recess.

  At the location where the seal contact surface ends, the turning radius of the recess and the closing body is typically divided, and the turning radius of the closing body is reduced with respect to the turning radius of the recess, for example.

  The recess and the closing body are preferably formed in the shape of a truncated cone, and the contact surface between them is shaped like a truncated cone extending from the bottom of the recess to the outer edge thereof. Typically, the conical inner surface in the recess extends from the bottom to the edge, while the conical outer surface in the closure is located immediately after the hole, for example by reducing the slope of the conical surface. Yes.

  In the cock device according to the present invention, the rotational movement of the closing body for opening and closing the channel is provided by a shaft rod coupled to the closing body and an actuator such as a hydraulic motor that rotates the rod via a lever arm. .

  Metals that can be cast by the cock apparatus according to the present invention include cast iron, steel, aluminum, zinc, gold, and other noble metals.

  The channel body and closure are suitably made from a refractory ceramic material such as corundum or other aluminum oxide based mixtures. The closure is preferably coated with a coating such as boron nitride to provide hermeticity. Ceramic materials are characterized by their dimensional stability due to their low coefficient of thermal expansion, in addition to their fire resistance, and can reduce dimensional tolerances in the elements of the cock.

The surface contacting the recess of the closing body is preferably coated with a lubricant before installation so as to obtain a good seal and facilitate the rotation of the closing body.
Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings. The accompanying drawings show a cock device according to one embodiment of the present invention.

  The plate 1 is a bottom portion of a metal casting container and is provided with an opening, and molten metal is provided on the plate. The cock device 2 is attached to the bottom. In the cock device 2, the channel body 3 is like a brick mouth, and the molten metal flowing from the holes of the plate 1 flows through the channel 4 in the channel body. A hollow recess 5 is provided at the side of the channel body 3, which is shaped like a truncated cone and extends across the channel 4.

  The cock device 2 has a rotatable closing body 6, which coincides with the recess 5 and thus forms a conical part. The closure 6 has a hole 7 across its length, the axis of which essentially catches or couples the axis of the channel 4. The end 8 of the closing body 6 is hinged to the bottom 9 of the recess. In this way, the clearance between the closing body 6 and the recess 5 from the bottom to the entire length of the channel 4 is precise and does not change depending on the temperature, because the guide surface is at the same temperature. This is because it is near the clearance.

  The contact surface that seals the closing body 6 and the recess 5 extends to the entire length from the bottom 9 of the recess 5 to the channel 4 and the hole 7. The contact surface ends at a location 11 in the recess 5 between the channel 4 and the outer edge 10 of the recess 5. The contact surface is preferably terminated at a position closer to the channel 4 than the outer edge 10. Outside the location 11, the contact ends when the inclination of the closing body 6 decreases. Accordingly, since the outer surface of the closing body 6 is not in contact with the inner surface of the recess 5 in the outer region, the surface temperature of the closing member 6 is greatly different.

  As will be apparent to those skilled in the art, the various uses of the present invention are not limited to the embodiments described above, but may vary within the scope defined by the claims. For example, several brick openings can be placed on the underside of the casting vessel to form a molten metal discharge channel.

  Improvements to the bottom cock of the metal casting container may be made in conjunction with the combination described above to hinge the end of the closure to the bottom of the recess and at the same time radically reduce the rotational contact surface. The new solution provides better results compared to conventional closing valves and sliding closure units.

It is the figure which showed the cock apparatus by one Embodiment of this invention.

Claims (6)

A cock device (2) for attachment to a bottom portion (1) of a metal casting container provided with an opening, and a channel (4) communicating with the opening provided in the bottom portion is penetrated, and a side portion thereof is the channel A channel body (3) having a rotationally symmetric recess (5) extending across (4);
A rotatable closure (6) adapted to the recess (5) and having a transverse hole (7) in the deep part of the channel (4);
When the closure (6) rotates, the hole (7) opens and closes the channel (4),
The end (8) of the closure (6) is hinged to the bottom (9) of the recess (5), and the contact surface between the closure (6) and the recess (5) is rotationally symmetric. And the cock apparatus characterized by being small compared with the rotating surface of a recessed part (5). The cock device according to claim 1,
The cock device characterized in that the contact surface is formed in the shape of a truncated cone extending from the bottom (9) to the outer edge (10) of the recess (5). The cock device according to claim 2,
The cock device characterized in that the contact surface is 10 to 80%, preferably 20 to 70% of the rotating surface. The cock device according to any one of claims 1 to 3,
The contact surface is from the bottom (9) between the channel (4) and the outer edge (10) of the recess (5), preferably closer to the channel (4) than the outer edge (10). ) In the region ending at the location (11). The cock device according to claim 5,
The cock device characterized in that the recess (5) and the closing body (6) have different turning radii outside the region (9-11). The cock device according to claim 5,
The cock device characterized in that the turning radius of the closing body (6) is reduced with respect to the turning radius of the recess (5).

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