JP6244766B2 - Bowl - Google Patents

Description

  The present invention relates to a mortar, and more particularly, to a mortar used when heat treating a ceramic body or the like used for manufacturing a ceramic electronic component.

  In a firing process in the case of firing a ceramic body used for manufacturing a ceramic electronic component or the like, the ceramic body is usually subjected to a heat treatment in a state where it is placed in a firing container called a mortar. An example of this type of bowl is disclosed in Patent Document 1. According to this background art, for the purpose of improving the strength of the mortar, the bottom part on which the molded body to be fired is placed, the side wall part raised from the edge of the bottom part, and from the side surface of the side wall part toward the outside of the wall. A mortar composed of protruding protrusions is disclosed.

Japanese Utility Model Publication No. 3-37396

  However, in the background art, the strength of the mortar is assumed to be used in vertical stacking. For example, when the mortars are arranged side by side and transported to the baking furnace, there may be a temperature difference between adjacent mortars. There is a problem that variation occurs and the mortar breaks due to the thermal shock caused by this temperature difference. In this way, when used side by side, there is a problem that did not become apparent when used vertically.

  The present invention solves the above-mentioned problems, and even when the mortar as a baking tool material is transported side by side, the temperature variation inside the mortar and the temperature variation An object of the present invention is to provide a mortar capable of preventing breakage due to thermal shock.

In order to achieve the above-mentioned object, the mortar of the present invention is a mortar having a bottom portion on which a material to be fired is placed and two pairs of opposing side wall portions provided on the edge of the bottom portion, and at least a pair of At least one protrusion is provided on each outer side surface of the opposing side wall portions, and the protrusions are arranged so that the protrusions of one pot and the other when the plurality of pots are arranged adjacent to each other. The outer surface of the side wall portion of the mortar is contacted, and the protrusion of one mortar and the protrusion of the other mortar are not in contact with each other,
Each of the protrusions has the same protruding dimension, and the shape when viewed from the upper surface of the mortar is a shape that makes point contact with an imaginary line parallel to the side wall portion where the protrusion is disposed. It is characterized by.

  Moreover, it is preferable that the said protrusion is arrange | positioned in the position which becomes a point symmetry when the mortar is seen from the upper surface.

In sagger of the present invention, the protrusion, the shape when viewed from the upper surface of the sagger, it is preferably a circular arc or triangular.

The selection method of the mortar according to the present invention is a method for designing a mortar when transferring a plurality of mortars along a lane in a heat treatment furnace, wherein the mortar is the mortar according to the present invention. The protrusion is also provided on the outer surface of the side wall perpendicular to the transport direction, and the difference between the width dimension of the lane and the width direction of the mortar including the protrusion is D, in the width direction, from the outer surface of the vertical side wall portion in the transport direction, when the distance to the projections projecting in the transport direction is d, characterized in that the d> D.

  In the mortar of the present invention, the bottom rear surface of the mortar is preferably formed so as to be in partial contact with the placement surface of the mortar (so as not to be in contact with the entire surface). Moreover, it is preferable that the contact surface with the said installation surface in the said bottom part back surface is provided in the edge of the bottom face of the said mortar.

  According to the present invention, even when a bowl such as a bowl is transported side by side, temperature variation within the bowl and damage to the bowl due to thermal shock caused by the temperature variation It is possible to provide a mortar capable of preventing the above.

  The above object, other objects, features and advantages of the present invention will become more apparent from the following detailed description of embodiments with reference to the drawings.

FIG. 1 is a perspective view showing a schematic configuration when the bowl 10 according to the first embodiment of the present invention is viewed from the front side. FIG. 2 is a perspective view showing a schematic configuration when the bowl 10 according to the first embodiment of the present invention is viewed from the back side. FIG. 3A is a front view of the mortar 10 according to the first embodiment of the present invention. 4 (a), 4 (b) and 4 (c) are front views showing modified examples (10A, 10B, 10C) of the mortar 10 according to the first embodiment of the present invention. FIG. 5 is a diagram showing a state when a plurality of bowls 10 according to the first embodiment of the present invention are transferred. FIG. 6 is a diagram showing a state when a plurality of bowls 10B according to the modification shown in FIG. 4B are transferred. FIG. 7 is a diagram showing a method for transporting a mortar according to the present invention. FIG. 8A, FIG. 8B, and FIG. 8C are diagrams illustrating a state during transportation of the plurality of mortars 10-1 and 10-2. Fig.9 (a) is a perspective view which shows schematic structure when the mortar 20 which concerns on the 2nd Embodiment of this invention is seen from the back side. FIG.9 (b) is sectional drawing which looked at the mortar 20 which concerns on the said 2nd Embodiment in the II direction in Fig.9 (a). FIG. 9C is a diagram illustrating the mounting surface 69.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. However, the present invention is not limited or limited to the following examples.

(First embodiment)
FIG. 1 is a perspective view showing a schematic configuration when the bowl 10 according to the first embodiment of the present invention is viewed from the front side. FIG. 2 is a perspective view showing a schematic configuration when the bowl 10 is viewed from the back side. FIG. 3A is a front view of the mortar 10. The mortar 10 fires a large number of stored ceramic compacts (sintered objects) while being placed and transported on a transport rail or a roller in a continuous firing furnace. The mortar 10 is made of alumina ceramic or the like. The mortar 10 is formed in a shape (a bowl shape) including a bottom part 11 on which an object to be fired is placed and a side wall part 12 (12A, 12B, 12C, 12D) provided at an edge of the bottom part 11. The pair of side wall portions 12A and 12B face each other, and the pair of side wall portions 12C and 12D also face each other. The mortar 10 is provided with a storage recess whose upper surface is opened in order to store a large number of ceramic molded bodies to be fired.

  And at least 1 protrusion 13 is provided in the outer surface of each side wall part 12 in at least a pair of opposing side wall part 12 of the mortar 10. Each of the protrusions 13 has the same protruding dimension, and is disposed at a point-symmetrical position with respect to the center P when the bowl 10 is viewed from the upper surface. By arranging the protrusions 13 at point-symmetrical positions, the weight balance of the mortar 10 itself is improved, so that the influence of vibration during transportation can be reduced and the transportation stability can be improved. . In the present invention, “point symmetry” is not limited to the exact point symmetry position, but near the point symmetry position that can reduce the influence of vibration and the like during transportation of the bowl 10 and achieve transportation stability. It is meant to include the range. In the mortar 10 according to the present embodiment, one protrusion 13 is provided on the outer surface of each side wall portion 12 of two pairs of opposing side wall portions (12A and 12B, 12C and 12D).

  In this embodiment, the protrusion 13 has a shape in which the shape when viewed from the upper surface of the mortar 10 is in point contact with an imaginary line L parallel to the side wall portion of the mortar 10. With such a shape, when a plurality of bowls 10 are arranged and transferred in a row, the protrusions 13 make point contact with adjacent bowls 10 (see FIG. 5). The mortars 10 are introduced into a heat treatment furnace in a state where they are arranged, and are heated, but heat conduction occurs by contacting the adjacent mortars 10 at that time. Since there is a temperature difference between the bowl 10 in the heat treatment furnace and the bowl 10 near the entrance, if the contact area between adjacent bowls is large, the bowl may be damaged due to thermal shock. May occur. Then, the protrusion 13 is provided in the outer surface of the side wall part 12 of the mortar 10 like this embodiment, and the crack of the mortar 10 is suppressed by making the contact area between the mortars 10 small. Moreover, since the heat transfer between the mortars 10 is also suppressed, the dispersion | variation in the temperature in the mortar 10 can also be improved.

  The protrusion dimension of the protrusion 13 (corresponding to the distance between the side wall 12 of the mortar 10 and the imaginary line L) is preferably 0.5 mm to 1 mm. This is because if the protrusion dimension of the protrusion 13 is too large, the number of mortars 10 that can be introduced into the heat treatment furnace is reduced.

  In the present embodiment, a concave groove 14 is provided on the upper end surface of each side wall 12 of the mortar 10. The concave groove 14 can function as a so-called fire groove. In addition, when the plurality of mortars 10 are stacked in the height direction, for example, if the mortars 10 are rotated by 45 degrees and stacked alternately according to the shape of the groove, the plurality of mortars 10 can be stabilized when stacked and conveyed. it can.

  FIGS. 4A, 4B, and 4C are front views showing modified examples of the mortar 10 according to the present embodiment (the mortar 10A, the mortar 10B, and the mortar 10C, respectively). As in the bowl 10B shown in FIG. 4B, the protrusion 13 may be provided only on the outer side surfaces of the pair of opposing side wall portions 12. In the case where the protrusions 13 are provided only on the pair of opposite side wall portions 12, the mortar 10B may be placed side by side so that the protrusions 13 come to the side wall portions 12 at a position perpendicular to the conveyance direction described later (FIG. 6). reference). The shape of the protrusion 13 is preferably a shape such that the contact between the mortars 10 becomes a point contact when viewed from the top in order to reduce the contact area. If the shape of the protrusion 13 is an arc (FIGS. 3, 4B and 4C) or a triangle (FIG. 4A), point contact is possible, and the protrusion 13 can be easily molded and damaged. Hard to do. In the present embodiment, the protrusion 13 is formed in a column shape in the height direction, but it is not essential that the protrusion 13 is present in the entire height direction of the outer side surface of the side wall portion 12. For example, the protrusion 13 has a hemispherical shape or a triangular pyramid shape. The protrusion 13 may be provided. Moreover, as shown in FIG.4 (c), the shape of the mortar 10C may be a rectangle.

  Next, the operation when heat treatment is performed in a heat treatment furnace using the mortar of the present invention will be described. FIG. 7 is a view showing a method for transporting the mortar 10. The mortar 10 is placed on the transport rail 61 in a state where a ceramic body is placed. Then, it is fed into a heat treatment area of the furnace body by a pusher (slag transport means) 62. In the figure, the arrow indicates the transport direction T (the traveling direction of the mortar 10). In the heat treatment area, the binder contained in the ceramic body is burned and decomposed to sinter the ceramic body.

  The pusher 62 has two rods 63A and a rod 63B, and the rod 10 is pushed and moved by these rods. The lengths of the rod 63A and the rod 63B can be adjusted. Here, an offset S that matches the size of the protrusion 13 provided in the bowl 10 is provided in the rod length direction, and the protrusion 13 is pushed by the rod 63B. Note that the lengths of the rods 63A and 63B may be the same, and the interval between the rods 63A and 63B may be narrowed to push the side wall portion 12 of the bowl 10 with the rods 63A and 63B. In addition, the rods 63A and 63B may be designed to have the same length, and the position where the protrusion 13 of the mortar 10 is formed is located away from the positions of the rods 63A and 63B.

  The transport rail 61 is provided with a pair of guides 64 for reducing the movement of the mortar 10 in the direction perpendicular to the transport direction T. The mortar 10 is transported on the transport rail 61 along the guide 64. The protrusions 13 provided on the mortar 10 are provided at least on the outer surface of the side wall portion 12 perpendicular to the transport direction T, but are also provided on the outer surface of the side wall portion 12 parallel to the transport direction T so that the guide 64 is provided. The contact area between the mortar and the mortar 10 can be reduced. By doing so, it is possible to reduce temperature unevenness in the mortar 10 due to heat conduction from the guide 64.

  FIG. 8A, FIG. 8B, and FIG. 8C are diagrams showing a state during conveyance of the plurality of mortars 10-1 and 10-2. In the same figure, the arrow has shown the conveyance direction T (traveling direction of the mortars 10-1 and 10-2). The conveyance rail 61 has a lane 67 that conveys the bottom 11 of the mortar 10 while making contact. The width of the lane 67 is defined by a pair of guides 64, and a clearance D is provided so as to be wider than the width of the pot 10 including the protrusion 13. At this time, as shown in FIG. 8, the mortar 10-1 and the mortar 10-2 conveyed adjacent to each other may move in the width direction of the lane 67 due to vibration during conveyance. In FIG. 8A, the protrusions 13 of the mortars 10-1 and 10-2 are moved by the clearance D in the direction approaching each other. On the other hand, in FIG.8 (b), the protrusion 13 of the mortars 10-1 and 10-2 is moving by the clearance D in the direction away from each other. When the mortar 10-1 and the mortar 10-2 move in the direction in which the protrusion 13 moves away from each other, the protrusion 13 is provided at the end (near the corner) of the mortar 10 as shown in FIG. As shown, it is assumed that the protrusion 13 shifts without contacting the side wall portion 12 of the adjacent mortar 10 during conveyance. Therefore, it is preferable to provide the protrusion 13 not on the end portion but on the inner side in the width direction of the outer side surface (position away from the end portion). Moreover, even if the clearance D is too large, it is assumed that the protrusion 13 is displaced without contacting the side wall 12 of the adjacent mortar 10 during conveyance. Therefore, it is preferable that the clearance D is not too large. Here, the clearance (difference between the width dimension of the lane 67 and the width direction dimension of the mortar 10 including the protrusion 13) is D, and the outside of the side wall portion 12 perpendicular to the transport direction T in the width direction of the lane 67 is defined as D. If the distance from the side surface to the protrusion 13 protruding in the transport direction T is d, it is preferable that d> D. Thereby, the problem that the mortar 10 will shift | deviate without the protrusion 13 contacting the side wall part 12 of the adjacent mortar 10 can be prevented.

  Further, if the protrusion 13 is provided in the vicinity of the center in the width direction of the outer surface, the protrusions 13 of the adjacent mortars 10 will hit each other, and therefore it is preferable to dispose the protrusion 13 at a position away from the center portion in the width direction of the outer surface. . In the range where the relationship between the clearance D and the distance d satisfies d> D, the distance between the protrusions 13 is large, but it is preferable because the straight running stability during conveyance is improved.

(Second Embodiment)
Fig.9 (a) is a perspective view which shows schematic structure when the mortar 20 which concerns on the 2nd Embodiment of this invention is seen from the back side. FIG.9 (b) is sectional drawing which looked at the mortar 20 in the II direction in Fig.9 (a). The mortar 20 of the present embodiment is provided with a recess in the bottom rear surface 21a, and the mortar 20 and the mounting surface 69 of the lane 67 are not in contact with each other but are in contact with each other. . The placement surface 69 is a region where the mortar 20 is placed on the lane 67, and is a region indicated by a thick broken line in FIG. 9C.

  By reducing the contact area between the mortar 20 and the mounting surface 69, a rapid temperature rise is suppressed and the mortar 20 is prevented from being damaged. Furthermore, the contact area between the mortar 20 and the mounting surface 69 is unlikely to fluctuate, and variations in temperature within the mortar 20 are improved. If the bottom surface of the bottom of the sagger is flat, the presence of foreign matter or a flaw on the mounting surface may cause a large variation in the contact area, which may cause a temperature distribution in the sagger. There is. In the present embodiment, such a risk can be reduced by reducing the contact area between the bottom rear surface 21a of the mortar 20 and the placement surface 69. In addition, it is possible to reduce the wear deterioration of the mounting surface 69 due to the conveyance of the bowl 20.

  The contact portion 23 with the mounting surface 69 is preferably formed in a continuous line shape so that it is less likely to be caught at the time of transfer, and more preferably provided so as to surround the edge of the mortar 20. Further, in the case of a square mortar 20 as shown in FIG. 9, the contact portion 23 is provided on the entire circumference so that no temperature variation occurs in the mortar 20 regardless of which side wall portion 12 is arranged in the transport direction T. It is preferable to have. However, the present invention is not limited to this. For example, depending on the shape of the transport rail 61, the contact portion 23 may be partially provided on the edge portion of the bottom portion 21. If the contact part 23 is provided in the position corresponding to the side wall part 12 of the front side of the mortar 20, it is preferable from a viewpoint of heat conduction.

  In the present embodiment, the bottom back surface 21a of the mortar 20 is produced by a method of providing a recess, but the present invention is not limited to this, and the bottom back surface 21a is formed as a flat surface and a method of providing a projection later. It can also be produced. The depth of the concave portion (or the height of the convex portion) is preferably about 0.1 to 1 mm, and more preferably 0.5 to 1 mm.

10, 10A, 10B, 10C, 10-1, 10-2, 20 Mortar 11, 21 Bottom 12, 12A, 12B, 12C, 12D Side wall 13 Projection 14 Concave groove 21a Bottom back surface 61 Transport rail 62 Pusher 63A, 63B Rod 64 Guide 67 Lane 69 Placement surface

P Center of mortar L Virtual line T Transport direction S Offset d Distance from projection end D Clearance

Claims (6)

A mortar having a bottom for placing an object to be fired, and two pairs of opposite side walls provided on an edge of the bottom,
At least one protrusion is provided on each outer surface of at least a pair of the opposite side wall portions,
When the protrusions are arranged adjacent to each other in a row, the protrusions of one pot contact the outer surface of the side wall portion of the other pot, and the protrusions of one pot Provided in a position where the protrusion and the protrusion of the other mortar do not contact each other,
Each of the protrusions has the same protruding dimension, and the shape when viewed from the upper surface of the mortar is a shape that makes point contact with an imaginary line parallel to the side wall portion where the protrusion is disposed. A bowl made of The mortar according to claim 1, wherein the protrusion is disposed at a position that is point-symmetric when the mortar is viewed from above . 3. The mortar according to claim 1, wherein a shape of the protrusion when viewed from an upper surface of the mortar is an arc or a triangle . The mortar according to any one of claims 1 to 3 , wherein a bottom rear surface of the mortar is formed so as to be in partial contact with a placement surface of the mortar. The mortar according to claim 4 , wherein a contact portion of the bottom rear surface with the mounting surface is provided at an edge of the bottom surface of the mortar. A method for designing a mortar when transferring a plurality of mortars along a lane in a heat treatment furnace,
The said mortar is the mortar according to any one of claims 1 to 5,
The protrusion is also provided on the outer surface of the side wall perpendicular to the transport direction,
The difference between the width dimension of the lane and the dimension in the width direction of the mortar including the protrusion is D,
In the width direction, and the distance from the outer surface of the vertical side wall portion in the conveying direction, until the projections projecting in the transport direction is d, sagger designing method which is characterized in that the d> D.

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