Lid for molten metal holding furnace

Abstract

To achieve a lid for a molten metal-holding furnace that facilitates the opening operation of the lid.SOLUTION: A lid (1) for a molten metal-holding furnace according to one embodiment of the present disclosure for closing an opening (21a) of the molten metal-holding furnace (2) includes: a base part (13) that is placed on a furnace wall (21b) around the opening (21a) in the molten metal-holding furnace (2) when the opening (21a) is closed with the lid (1); and a convex portion (14) that protrudes from the base (13) and is inserted into the opening (21a). The convex part (14) has a chamfer (14a) corresponding to a widening part (21d) formed on the furnace wall (21b) of the molten metal-holding furnace (2) so that a width dimension of the opening (21a) expands as it moves toward an upper side of the molten metal-holding furnace (2).SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] FIELD OF THE DISCLOSURE The present disclosure relates to a lid for a molten metal holding furnace. [Background technology]

[0002] Generally, a molten metal holding furnace is used to keep the temperature of a molten metal such as aluminum when the molten metal is cast. The opening of such a molten metal holding furnace is closed with a lid to improve the thermal insulation inside the molten metal holding furnace.

[0003] For example, Patent Document 1 discloses a drop lid that is inserted into a molten metal storage furnace and floats in contact with the surface of the molten metal while following the up and down movement of the surface. The lid in Patent Document 1 has a tapered portion that corresponds to a tapered portion formed in the upper part of the furnace wall of the molten metal storage furnace, and is configured not to move downward relative to the upper part of the tapered portion formed in the side wall of the molten metal storage furnace. This prevents the lid from coming into contact with a heater located in the lower part of the molten metal storage furnace. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] JP 2018-58101 A Summary of the Invention [Problem to be solved by the invention]

[0005] The applicant has found the following problem: The lid in Patent Document 1 is configured to float so as to be in contact with the surface of the molten metal, so when opening the lid, it is necessary to pick up the lid from inside the molten metal holding furnace, making the lid opening operation complicated.

[0006] The present disclosure has been made in consideration of such problems, and provides a lid for a molten metal holding furnace that can be easily opened. [Means for solving the problem]

[0007] A lid for a molten metal storage furnace according to one aspect of the present disclosure is a lid for closing an opening of a molten metal storage furnace, a base portion that is placed on a furnace wall around the opening of the molten metal storage furnace in a state where the opening is closed by the lid; a protrusion protruding from the base and inserted into the opening; Equipped with The convex portion has a chamfered portion that corresponds to a widening portion formed in the furnace wall of the molten metal storage furnace so that the width dimension of the furnace wall increases toward the upper side of the molten metal storage furnace.

[0008] In the above-mentioned lid for a molten metal holding furnace, it is preferable that, when the opening is closed by the lid, the part of the base that is placed on the furnace wall around the opening is in surface contact with the furnace wall around the opening, and the chamfered part of the convex part is in surface contact with the widened part of the molten metal holding furnace.

[0009] In the above-mentioned lid for a molten metal storage furnace, when the lid rotates around a rotation axis extending horizontally, it is preferable that the chamfered portion be formed on the side of the convex portion so that the lid does not interfere with the furnace wall of the molten metal storage furnace.

[0010] In the above-described lid for a molten metal storage furnace, when the opening is closed by the lid, the convex portion has a rectangular shape when viewed from above and below the molten metal storage furnace, one side of the rectangular convex portion is connected to a rotation shaft that is arranged parallel to the one side and extends horizontally, It is preferable that the chamfered portion is disposed along a side of the rectangular convex portion opposite to the one side.

[0011] In the above-described lid for a molten metal holding furnace, it is preferable that the chamfered portion is formed over the entire side surface of the convex portion.

[0012] In the above-described lid for a molten metal holding furnace, the chamfered portion is preferably an inclined surface corresponding to the widened portion. [Effects of the Invention]

[0013] According to the present disclosure, it is possible to realize a lid for a molten metal holding furnace that can be easily opened. [Brief explanation of the drawings]

[0014] [Figure 1] 1 is a cross-sectional view of the molten metal holding furnace, with the opening of the holding chamber closed using the lid of the embodiment, viewed from the +X-axis side. FIG. [Figure 2] 1 is a view from the +Z axis side showing a state in which the opening of the holding chamber of the molten metal holding furnace is closed with the lid of the embodiment. FIG. [Figure 3] FIG. 2 is an enlarged view of part III in FIG. [Figure 4] 10 is a cross-sectional view of the lid of the embodiment, viewed from the +X-axis side, in the middle of being opened. FIG. [Figure 5] 10 is a cross-sectional view of the embodiment with the cover open, as viewed from the +X-axis side. FIG. [Figure 6] FIG. 10 is a view from the +Z axis side showing the state in which the opening of the holding chamber of the molten metal holding furnace is closed with a cover according to a different embodiment. DETAILED DESCRIPTION OF THE INVENTION

[0015] Specific embodiments to which the present disclosure is applied will be described in detail below with reference to the drawings. However, the present disclosure is not limited to the following embodiments. In addition, the following description and drawings have been simplified as appropriate for clarity of explanation.

[0016] First, the configuration of the lid in this embodiment will be described. Note that the following description of the lid configuration will be based on the assumption that the lid is closing the opening of the holding chamber of the molten metal storage furnace. For clarity, the following description will be given using a three-dimensional (XYZ) coordinate system. The positive side of the Z axis corresponds to the upper side of the molten metal storage furnace, and the negative side of the Z axis corresponds to the lower side of the molten metal storage furnace.

[0017] Fig. 1 is a cross-sectional view from the +X-axis side showing the state in which the opening of the holding chamber of the molten metal storage furnace is closed with the lid of this embodiment. Fig. 2 is a view from the +Z-axis side showing the state in which the opening of the holding chamber of the molten metal storage furnace is closed with the lid of this embodiment. Fig. 3 is an enlarged view of part III in Fig. 1. Note that Fig. 1 shows the area around the +Z-axis side of the holding chamber of the molten metal storage furnace.

[0018] The lid 1 of this embodiment is used to close the opening of a molten metal storage furnace 2, as shown in Figures 1 and 2. The molten metal storage furnace 2, although not specifically shown, is equipped with a molten metal receiving chamber into which the molten metal is poured, a holding chamber that keeps the molten metal warm, and a pumping chamber from which the molten metal is pumped out, with adjacent chambers in the Y-axis direction communicating with each other via communication sections formed on the negative Z-axis side of the furnace walls that separate the chambers. The ends of the molten metal receiving chamber, holding chamber, and pumping chamber on the positive Z-axis side are equipped with openings.

[0019] 1 and 2, the lid 1 is used to close the opening 21a of the holding chamber 21 of the molten metal storage furnace 2. However, the lid 1 may also be used to close the opening of the molten metal receiving chamber of the molten metal storage furnace 2, or the opening of the pumping chamber of the molten metal storage furnace 2.

[0020] At this time, as shown in Figures 1 and 2, the holding chamber 21 of the molten metal holding furnace 2 has a substantially rectangular shape surrounded by a furnace wall 21b when viewed from the Z-axis direction, and an enlarged portion 21d is formed on the Z-axis + side portion of the Y-axis - side wall surface 21c of the Y-axis + side furnace wall 21b, which widens the width dimension of the opening 21a (i.e., the Z-axis + side portion of the holding chamber 21) in the Y-axis direction.

[0021] 2, widened portion 21d is arranged along the side on the +Y axis side of the four sides formed by wall surface 21c surrounding holding chamber 21. Widened portion 21d is an inclined surface that inclines toward the +Y axis side as it approaches the +Z axis side, as shown in FIG.

[0022] As shown in Figs. 1 and 2, the lid 1 includes a heat insulating portion 11 and a cover portion 12, and is rotatable around a rotation axis AX1 extending in the X-axis direction. The heat insulating portion 11 is made of a heat insulating material, for example, L It can be made of a mina heat insulating material, a ceramic heat insulating material, etc. However, the heat insulating portion 11 can be made of a material that is commonly used for closing the opening of a molten metal storage furnace.

[0023] 1 and 2, the heat insulating portion 11 includes a base portion 13 and a protrusion 14. As shown in Fig. 1, the base portion 13 is placed on a furnace wall 21b around the opening 21a of the holding chamber 21 of the molten metal storage furnace 2, with the opening 21a being closed by the lid 1. As shown in Fig. 2, the base portion 13 has a plate shape that is wider than the opening 21a, and is, for example, substantially rectangular when viewed from the Z-axis direction.

[0024] 1, the protrusion 14 protrudes from the base 13 toward the negative Z-axis side so as to be inserted into the opening 21a of the holding chamber 21 of the molten metal storage furnace 2 when the opening 21a is closed by the lid 1. As shown in FIGS. 1 and 2, the protrusion 14 has a shape corresponding to the shape of the portion of the holding chamber 21 of the molten metal storage furnace 2 on the positive Z-axis side, i.e., the portion of the wall surface 21c surrounding the holding chamber 21 on the positive Z-axis side.

[0025] 1 and 2, the protrusion 14 has a generally rectangular shape corresponding to the portion on the +Z-axis side of the wall surface 21c surrounding the holding chamber 21 when viewed from the Z-axis direction. A chamfered portion 14a is formed on the side surface on the +Y-axis side of the protrusion 14, corresponding to the widened portion 21d formed on the wall surface 21c of the furnace wall 21b on the +Y-axis side of the holding chamber 21.

[0026] 1 to 3, the chamfered portion 14a is an inclined surface corresponding to the widened portion 21d formed on the wall surface 21c of the furnace wall 21b on the +Y-axis side of the holding chamber 21. Therefore, the convex portion 14 has a right-angled trapezoidal column shape when viewed from the X-axis direction.

[0027] That is, the protrusion 14 has a right-angled trapezoidal shape as viewed from the X-axis direction and includes a positive X-axis surface that is substantially parallel to the YZ plane, a negative X-axis surface that is substantially the same shape as the positive X-axis surface and is substantially parallel to the YZ plane, a negative Y-axis surface that is substantially rectangular as viewed from the Y-axis direction and is substantially parallel to the XZ plane, a positive Y-axis surface that is substantially rectangular as viewed from the Y-axis direction and inclined toward the positive Y-axis side as it approaches the positive Z-axis side, and a substantially rectangular negative Z-axis surface that is substantially parallel to the XY plane and is formed by the negative Z-axis side edge of the positive X-axis surface, the negative X-axis surface, the negative Y-axis surface, and the positive Y-axis surface. The base 13 and protrusion 14 are preferably formed integrally.

[0028] The cover part 12 covers the surfaces of the base part 13 of the heat insulating part 11 except for the surface on the negative Z-axis side. The cover part 12 is, for example, substantially rectangular when viewed from the Z-axis direction and has a box shape with an opening on the negative Z-axis side. The cover part 12 is made of, for example, metal, but may be made of any material that can fix the heat insulating part 11.

[0029] The cover part 12 may be omitted if it has sufficient rigidity to prevent damage to the heat insulating part 11 when the lid 1 is opened or closed. The shape of the cover part 12 can be changed as appropriate depending on the shape of the base part 13 of the heat insulating part 11.

[0030] The heat insulating part 11 and the cover part 12 are fixed together with the base part 13 of the heat insulating part 11 disposed inside the cover part 12. For example, although not shown, the heat insulating part 11 and the cover part 12 can be fixed together by passing a rod screw protruding from the ceiling part 12a of the cover part 12 to the negative Z-axis side through a through-hole formed in the heat insulating part 11 and screwing a nut onto the negative Z-axis side end of the rod screw. However, the method for fixing the heat insulating part 11 and the cover part 12 is not particularly limited.

[0031] An end portion of the cover portion 12 on the negative Y-axis side and the positive Z-axis side is connected to a drive device (not shown) that rotates the lid 1 around the rotation axis AX1. That is, in the heat insulating portion 11, the side opposite in the Y-axis direction (i.e., the negative Y-axis side) to the side where the chamfered portion 14a of the convex portion 14 is arranged (i.e., the positive Y-axis side) is connected to the rotation axis AX1.

[0032] In this case, when viewed from the Z-axis direction, the negative side of the Y-axis of the protrusion 14 of the heat insulating part 11 and the rotation axis AX1 are arranged approximately parallel to each other. This makes it possible to realize a configuration in which the lid 1 rotates around the rotation axis AX1 by driving the drive device.

[0033] Next, the opening and closing operation of the lid of this embodiment will be described. Fig. 4 is a cross-sectional view of the lid of this embodiment as it is being opened, as seen from the +X-axis side. Fig. 5 is a cross-sectional view of the lid of this embodiment as it is opened, as seen from the +X-axis side. Note that Figs. 4 and 5 show only the area around the +Z-axis side of the holding chamber of the molten metal holding furnace.

[0034] As shown in FIG. 1, the opening 21a of the holding chamber 21 of the molten metal holding furnace 2 into which the molten metal M has been poured is closed with the lid 1, and then the drive device is operated to rotate the lid 1 in the direction of arrow A around the rotation axis AX1 as shown in FIG. 4.

[0035] This opens the lid 1. At this time, when viewed from the Z-axis direction, the chamfered portion 14a is arranged in the convex portion 14 of the heat insulating portion 11 along the side opposite in the Y-axis direction (i.e., the side on the +Y-axis side) to the side connected to the rotation axis AX1 (i.e., the side on the -Y-axis side). Therefore, when the lid 1 rotates in the direction of arrow A, the convex portion 14 of the heat insulating portion 11 can be prevented from contacting the furnace wall 21b on the +Y-axis side of the holding chamber 21 of the molten metal holding furnace 2.

[0036] Furthermore, when opening the lid 1, the base portion 13 of the insulating portion 11 of the lid 1 is placed on the furnace wall 21b surrounding the holding chamber 21 of the molten metal holding furnace 2, so there is no need to pick up the lid from inside the molten metal holding furnace when opening it, as with the lid of Patent Document 1, and the operation of opening the lid 1 is easier than with the lid of Patent Document 1.

[0037] Then, as shown in FIG. 5, the drive device is further driven to rotate the lid 1 in the direction of arrow A, and when the lid 1 assumes a predetermined open position, the opening operation of the lid 1 is completed.

[0038] Meanwhile, as shown in FIG. 5, the drive unit is driven with the lid 1 in the open position to rotate the lid 1 in the direction of arrow B (see FIG. 4), and as shown in FIG. 1, the protrusion 14 of the insulating portion 11 on the lid 1 is inserted into the opening 21a of the holding chamber 21 of the molten metal holding furnace 2, while the base portion 13 of the insulating portion 11 is placed on the furnace wall 21b around the opening 21a.

[0039] This closes the lid 1. At this time, when viewed from the Z-axis direction, the chamfered portion 14a is arranged in the convex portion 14 of the heat insulating portion 11 along the side opposite in the Y-axis direction to the side connected to the rotation axis AX1, so that even when the lid 1 rotates in the direction of arrow B, the convex portion 14 of the heat insulating portion 11 can be prevented from contacting the furnace wall 21b on the +Y-axis side of the holding chamber 21 of the molten metal storage furnace 2.

[0040] Furthermore, since the insulating portion 11 of the lid 1 has a convex portion 14, the end of the insulating portion 11 on the +Z axis side is positioned closer to the surface of the molten metal M than when the insulating portion 11 does not have the convex portion 14, so the air layer between the molten metal M and the insulating portion 11 can be reduced and the insulating properties of the molten metal M can be improved.

[0041] 1 and 3, when the lid 1 is closed, the negative Z-axis side surface of the base 13 preferably comes into substantial surface contact with the positive Z-axis side surface of the furnace wall 21b surrounding the holding chamber 21 of the molten metal storage furnace 2, and the side surface of the protrusion 14 preferably comes into substantial surface contact with the wall surface 21c of the furnace wall 21b surrounding the holding chamber 21 of the molten metal storage furnace 2. This improves the thermal insulation of the molten metal M.

[0042] At this time, since the chamfered portion 14a is formed on the protrusion 14 of the lid 1, the contact area between the heat insulating portion 11 and the furnace wall 21b on the + side of the Y axis can be made larger than when the chamfered portion 14a is not formed on the protrusion 14. This makes it possible to further improve the heat insulating property of the molten metal M.

[0043] In this way, when viewed from the Z-axis direction, the lid 1 of this embodiment has a chamfered portion 14a arranged in the convex portion 14 of the insulating portion 11 along the side opposite in the Y-axis direction to the side connected to the rotation axis AX1, so that when the lid 1 rotates, the convex portion 14 of the insulating portion 11 can be prevented from coming into contact with the furnace wall 21b on the Y-axis + side of the holding chamber 21 of the molten metal holding furnace 2, etc.

[0044] Furthermore, when opening the lid 1, the base portion 13 of the insulating portion 11 of the lid 1 is placed on the furnace wall 21b surrounding the holding chamber 21 of the molten metal holding furnace 2, so there is no need to pick up the lid from inside the molten metal holding furnace when opening it, as with the lid of Patent Document 1, and the operation of opening the lid 1 is easier than with the lid of Patent Document 1.

[0045] Furthermore, since the insulating portion 11 of the lid 1 has a convex portion 14, the end of the insulating portion 11 on the +Z axis side is positioned closer to the surface of the molten metal M than when the insulating portion 11 does not have the convex portion 14, so the air layer between the molten metal M and the insulating portion 11 can be reduced and the insulating properties of the molten metal M can be improved.

[0046] The present disclosure is not limited to the above-described embodiments, and can be modified as appropriate within the scope of the present disclosure.

[0047] In the above embodiment, the chamfered portion 14a of the lid 1 is formed on the surface on the +Y-axis side of the protrusion 14 of the heat insulating portion 11, but as shown in Fig. 6, it may be formed on the entire side surface of the protrusion 14. This reduces stress concentration at the corner of the boundary between the base portion 13 and the protrusion 14, and makes it possible to suppress damage to the heat insulating portion 11.

[0048] For example, the shape of the protrusion 14 can be changed as appropriate depending on the shape of the holding chamber 21 of the molten metal storage furnace 2, and may be, for example, circular when viewed in the Z-axis direction. In this case, it is preferable that the entire side surface of the protrusion 14 is formed with a chamfered portion 14a.

[0049] Furthermore, although the chamfered portion 14a in the above embodiment is an inclined surface, it may be a curved surface, etc. In short, the chamfered portion 14a may be formed so that the lid 1 does not come into contact with the periphery of the opening of the molten metal storage furnace 2 when the lid 1 is rotated, for example.

[0050] In the above embodiment, the lid 1 is configured to rotate around the rotation axis AX1, but the opening and closing operation of the lid 1 is not limited thereto, and the lid 1 may be moved in the Z-axis direction, or may be moved to the +Z-axis side to a height where the protrusion 14 of the lid 1 does not interfere with the molten metal storage furnace 2, and then the lid 1 may be moved in the Y-axis direction to open the lid 1. [Explanation of symbols]

[0051] 1 lid 11 Insulation section 12 Cover part, 12a Ceiling part 13 Base 14 convex portion, 14a chamfered portion 2. Molten metal holding furnace 21 holding chamber, 21a opening, 21b furnace wall, 21c wall surface, 21d widening portion AX1 Rotation Axis M molten metal

Claims

1. A lid for closing an opening of a molten metal holding furnace, a heat insulating section made of alumina heat insulating material or ceramic heat insulating material, the heat insulating section having a base section that is placed on a furnace wall around the opening of the molten metal storage furnace with the opening closed by the lid, and a protrusion that protrudes from the base section and is inserted into the opening; a cover portion that covers the base portion of the heat insulating portion from above and is fixed to the heat insulating portion; Equipped with the convex portion has a chamfered portion corresponding to a widening portion formed in a furnace wall of the molten metal storage furnace such that the width dimension of the opening increases toward the upper side of the molten metal storage furnace, A lid for a molten metal holding furnace, wherein, when the opening is closed with the lid, the portion of the base that is placed on the furnace wall around the opening is in surface contact with the furnace wall around the opening, and the chamfered portion of the convex portion is in surface contact with the widened portion of the molten metal holding furnace.

2. 2. The lid for a molten metal holding furnace according to claim 1, wherein the chamfered portion is formed on a side surface of the convex portion so that the lid does not interfere with a furnace wall of the molten metal holding furnace when the lid rotates around a rotation axis extending horizontally.

3. When the opening is closed by the lid, the convex portion has a rectangular shape when viewed from above and below the molten metal storage furnace, one side of the rectangular convex portion is connected to a rotation shaft that is arranged parallel to the one side and extends horizontally, 3. The lid for a molten metal holding furnace according to claim 1, wherein the chamfered portion is disposed along a side of the rectangular convex portion opposite to the one side.

4. 3. The lid for a molten metal holding furnace according to claim 1, wherein the chamfered portion is formed over the entire side surface of the convex portion.

5. 3. The lid for a molten metal holding furnace according to claim 1, wherein the chamfered portion is an inclined surface corresponding to the widened portion.

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