JPH0726690U - Casting furnace lid - Google Patents

Abstract

(57) [Abstract] [Purpose] To provide a furnace lid for a casting furnace which is not deformed by the heat of the molten metal. The furnace lid 4 of the present invention comprises a cylindrical peripheral wall plate 17 and annular upper and lower edge plates 18 integrally fixed to the upper and lower end edges of the peripheral wall plate and extending radially inward from the end edges. , 19, plate-shaped upper and lower cover plates 20 and 21 provided on inner surfaces 18b and 19b of the upper and lower edge plates, which are slidable along outer peripheral portions 20a and 21a, respectively, and a peripheral wall plate 17. , Edge plates 18 and 19 and lid plate 2
It consists of an internal insulation 32 surrounded by 0, 21.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a structure of a furnace lid that covers an opening provided in a casting furnace so that the opening can be opened and closed.

[0002]

[Prior art]

 The casting furnace has an opening for pumping the molten metal inside, but this opening should be closed with a lid (furnace lid) except when pumping the molten metal to prevent the temperature of the molten metal from falling. Is preferred.

Conventionally, as such a furnace lid, a heat insulating material is interposed between an upper plate and a lower plate, the periphery thereof is surrounded by an outer plate, and the upper plate, the lower plate and the outer plate are integrally formed by welding or the like. Those that were stuck were being used.

[0004]

[Problems to be solved]

 However, in such a furnace lid, when the upper and lower plates expand due to the influence of the heat of the molten metal, the outward expansion is restricted by the outer plate, and the expansion amounts of the upper plate and the lower plate are equal due to the temperature difference. Since it is not present, the surface of the lid often deforms unevenly. When the lid is deformed in this way, the opening of the furnace cannot be completely closed, and the heat of the molten metal is released to the outside through the opening, resulting in energy loss.

Therefore, the present invention is intended to provide a furnace lid which is not deformed by the heat of the molten metal and therefore can completely close the opening to prevent energy loss.

[0006]

[Means and Actions for Solving the Problems]

 Therefore, the furnace lid for the casting furnace of the present invention comprises a cylindrical peripheral wall plate, and annular upper and lower edge plates that are integrally fixed to the upper and lower end edges of the peripheral wall plate and extend radially inward from the end edge. , Upper and lower lid plates provided on the inner surfaces of the upper and lower edge plates facing each other so that their outer peripheral portions are slidable, and an internal heat insulating material surrounded by the peripheral wall plate, the edge plate and the lid plate. It consists of

According to the present invention, the upper and lower lid plates can be freely expanded and contracted without being restricted by the peripheral wall plates surrounding them, so that the plane of the furnace lid is not deformed, and Even if the furnace lid is used for a long period of time, it keeps close contact with the end face of the opening of the furnace and keeps the function of preventing the heat of molten metal from being released.

Although the lid plate is separate from the peripheral wall plate, since it is held down from above or below by the edge plate, there is no risk of the lid plate falling off from the furnace lid body.

[0009]

【Example】

 The present invention will be described below with reference to an embodiment shown in the drawings.

1 and 2 are overall side views of a casting furnace apparatus, FIG. 1 showing a state in which the furnace lid is closed, and FIG. 2 showing a state in which the furnace lid is opened. FIG. 3 is a partial top view of FIG.

Reference numeral 1 denotes a casting furnace in which a casting material such as aluminum is melted and stored as a molten metal. A casting port 2 for pumping the molten metal is provided on the upper surface of the casting furnace 1, and an opening 3 thereof is opened and closed by a furnace lid 4. Therefore, the furnace lid 4 is connected to the opening / closing device 5.

The opening / closing device 5 includes a swing arm 8 which is pivotally supported by a support base 6 via a pivot shaft 7 at an intermediate portion, and is supported by the support base 6 via a pivot shaft 9 above the swing arm 8. An air cylinder 10 oriented vertically is provided, and a lower end of a piston rod 11 extending downward from the air cylinder 10 is engaged with an outer end portion of the swing arm 8 via a roller 12. The inner end of the swing arm 8 extends to the upper surface of the furnace lid 4 and is fixed to the upper surface via a mounting member 13.

The mounting members 13 are made of chevron steel, and as shown in FIG. 3, two mounting members 13 are arranged on the upper surface of the furnace lid 4 in parallel with each other and fastened to the furnace lid 4 by bolts 14, respectively. Inner end portions 8a and 8b of the swing arm 8 which are bifurcated along the mounting members 13 are fastened to the corresponding mounting members 13 by bolts 15. The outer end of the mounting member 13 projects outward from the furnace lid 4 and is supported from below by a support member 16 having a chevron cross section fixed to the outer peripheral wall of the furnace lid 4.

When not in use, the pumping port 2 of the casting furnace 1 is closed by the furnace lid 4 as shown in FIG. 1, but when the molten metal is pumped up from the casting furnace 1 when in use, the air cylinder 10 is operated. The piston rod 11 is projected from the air cylinder 10 and the swing arm 8 is swung around the pivot 7 to swing the furnace lid 4 to the upper position as shown in FIG. Then, the molten metal in the casting furnace 1 is pumped up from the opened opening 3.

The detailed structure of the furnace lid 4 will be described below with reference to FIGS. 4 to 6. The furnace lid 4 has a thick disc shape as a whole, and as shown in FIGS. 4 and 6, is provided with a cylindrical peripheral wall plate 17. An annular upper edge plate 18 and a lower edge plate 19 are welded to the peripheral wall plate 17 at the upper edge and the lower edge of the peripheral wall plate 17, respectively, and the outer peripheral edges of the upper and lower surfaces of the furnace lid 4 are welded to each other. It is fixed so that it will be framed.

An upper cover plate 20 and a lower cover plate 21 are fitted inside the upper and lower edge plates 18 and 19, respectively. The lid plates 20 and 21 have a disk shape, and the openings formed by the inner peripheral edges 18a and 19a of the edge plates 18 and 19 are covered with the lid plates 20 and 21. The outer peripheral portions 20a and 21a of the lid plates 20 and 21 are along the inner side surfaces 18b and 19b of the edge plates 18 and 19, respectively, but the corresponding edge plates and lid plates are not connected to each other, and the two are mutually connected. It is slidable.

FIG. 6 is a top view of the furnace lid 4 in which the upper edge plate 18 and the upper lid plate 20 are partially cut away. As can be seen from the figure, two crosspiece members 22 parallel to each other are provided on the lower side of the upper cover plate 20, and one crosspiece member 22 orthogonal to these crosspiece members 22 and extending along the diameter of the furnace lid 4. The crosspiece member 23 is disposed by welding both ends to the peripheral wall plate 17, respectively. The attachment member 13 is fixed to the furnace lid 4 by fastening the bottom side 13a to the crosspiece member 22 with a bolt 14 (FIG. 4). A bottom side 13a of the mounting member 13 is cut out from a portion corresponding to the upper edge plate 18, and its upper surface is flush with the upper surface of the upper edge plate 18. By doing this, the bottom side 13a comes close to the crosspiece member 22, and the connection between the two becomes stronger. The support member 16 that supports the outer end protruding portion of the mounting member 13 is attached to the peripheral wall plate 17 by a bolt 25 that is screwed into a nut 24 that is welded to the inside of the peripheral wall plate 17.

The bolt 14 sequentially penetrates the bottom side 13 a of the mounting member 13, the upper cover plate 20 and the crosspiece member 22 from above and is screwed into a nut 26 welded to the lower surface of the crosspiece member 22. The hole 27 of the upper cover plate 20 through which 14 penetrates has a large diameter so as not to prevent free sliding of the upper cover plate 20.

Pin holes 28 are provided in the respective central positions of the upper cover plate 20, the crosspiece member 23 and the lower cover plate 21 so as to be aligned upward and downward, and pins 29 are inserted into the pin holes 28 from below. It is fixed by a split pin 30 at the upper end (Fig. 5). The upper cover plate 20 and the lower cover plate 21 are held concentrically with the peripheral wall plate 17 by the pins 29, and a uniform gap 31 is provided between the outer periphery of the cover plates 20 and 21 and the inner periphery of the peripheral wall plate 31. Are formed.

A heat insulating material 32 is filled in the inside of the furnace lid 4 having the outer shell configured as described above to prevent the heat of the molten metal from being transmitted to the outside through the furnace lid 4. As the material of the heat insulating material 32, a material having good heat resistance at the melt temperature, such as a ceramic material, is preferable. Good heat resistance is also required for other members, especially for the lower cover plate 21, so that, for example, in the case of an aluminum alloy casting furnace, at least the lower cover plate 21 is preferably made of stainless steel. In FIGS. 3 and 6, reference numeral 33 is a sensor insertion port for inserting a sensor for measuring the melt temperature.

When the furnace lid 4 closes the pumping port 2 of the casting furnace 1 as shown in FIG. 1, the lower edge plate 19 is in contact with the end face of the peripheral wall of the pumping port 2 and below the lower cover plate 21. The part extending inward from the edge plate 19 directly faces the molten metal. As a result, the temperature of the lower lid plate 21, which is directly affected by the heat of the molten metal, becomes significantly higher than the other parts of the furnace lid 4, and the amount of temperature expansion also increases. However, the lower lid plate 21 is slidable with respect to the lower edge plate 19, the center portion is held by the pin 29, and between the outer peripheral edge of the lower lid plate 21 and the inner peripheral surface of the peripheral wall plate 17. Since a uniform gap 31 is left over the entire circumference, the expansion of the lower cover plate 21 is not restricted by the annular body composed of the lower edge plate 19, the peripheral wall plate 17, and the upper edge plate 18, and the lower cover plate 21 is not restricted. The 21 is free to expand. Therefore, the lower lid plate 21 is held in a flat plate shape without being deformed in a wave shape due to thermal stress, and similarly, the lower edge plate 19 is also kept in a flat plate shape.

Even if a temperature difference occurs in the annular body, this temperature difference is not as great as the temperature difference between the lower lid plate 21 and the upper portion is not restricted by the upper edge plate 18. Therefore, thermal stress to the extent that plastic deformation occurs in the annular body does not occur.

Therefore, even if the furnace lid 4 is repeatedly used for a long period of time, a gap is created between the lower edge plate 19 and the peripheral wall end surface of the pumping port 2, and the heat of the molten metal is released to the outside through this gap. There is no risk of energy loss.

Further, since the outer peripheral portions of the upper cover plate 20 and the lower cover plate 21 are covered from the outside by the upper edge plate 18 and the lower edge plate 19, respectively, the heat insulating material 32 inside should be completely surrounded. In addition, the lid plates 20 and 21 are not likely to fall off the furnace lid 4.

Although the present invention has been described above with reference to the illustrated embodiment, it is needless to say that the present invention is not limited to this embodiment and various modifications can be made within the scope of the present invention. For example, although the furnace lid 4 has a disk shape in the above-described embodiment, the present invention can be applied to a square plate-shaped furnace lid.

[0026]

[Effect of device]

 The furnace lid according to the present invention does not deform the flat surface of the furnace lid due to the heat of the molten metal, and therefore keeps the function of keeping the molten metal heat from sticking to the end face of the furnace opening even if it is used for a long period of time. To do.

[Brief description of drawings]

FIG. 1 is an overall side view showing a state of a casting furnace apparatus to which the present invention is applied when a furnace lid is closed.

FIG. 2 is an overall side view showing a state in which the furnace lid of the casting furnace apparatus is opened.

FIG. 3 is a partial top view of FIG.

FIG. 4 is a sectional view taken along line IV-IV in FIG.

5 is a cross-sectional view taken along the line VV of FIG.

FIG. 6 is a partially cutaway top view of the furnace lid.

[Explanation of symbols]

1 ... Casting furnace, 2 ... Pumping port, 3 ... Opening part, 4 ... Furnace lid, 5
... Opening / closing device, 6 ... Support base, 7 ... Axis, 8 ... Swing arm,
9 ... Axis, 10 ... Air cylinder, 11 ... Piston rod, 12
... Roller, 13 ... Mounting member, 14,15 ... Bolt, 16 ... Supporting member, 17 ... Perior wall plate, 18 ... Upper edge plate, 19 ... Lower edge plate, 20 ... Upper lid plate, 21 ... Lower lid plate, 22, 23 ... Cross member, 24 ... Nut, 25 ... Bolt, 26 ... Nut, 27 ... Hole, 28 ... Pin hole, 29 ... Pin, 30
… Split pins, 31… Gap, 32… Insulation, 33… Sensor insertion port.

Claims (1)

[Scope of utility model registration request] 1. A tubular peripheral wall plate, annular upper and lower edge plates integrally fixed to upper and lower end edges of the peripheral wall plate, and extending inward in the radial direction from the edge, respectively. A casting furnace comprising plate-shaped upper and lower cover plates provided on the inner surfaces facing each other so that their outer peripheral portions are slidably provided, and an internal heat insulating material surrounded by the peripheral wall plate, the edge plate and the cover plate. Furnace lid.