JPS6246154Y2 - - Google Patents

Description

[Detailed description of the invention] The present invention relates to a ceramic firing pallet used when firing ceramics by placing a ceramic base formed in a predetermined shape in advance and passing it through a firing kiln. It is something.

For example, when firing tiles, the shaped base material is
This is done by heating to 900°C to 1300°C for a certain period of time, but in order to make the firing process more efficient, a large number of pre-formed substrates are placed on a firing pallet, and this firing pallet is placed on a trolley. This is then passed through a firing kiln, during which time it is fired.

Conventionally, ceramic firing pallets (hereinafter referred to as pallets) are used for the above-mentioned firing operations.
For example, the one shown in FIG. 1 is known.

In FIG. 1, reference numeral 11 indicates a pallet, and the pallet 11 is composed of a frame 12 made of heat-resistant metal, pillars 13, and shelf boards 14. This frame body 12 is assembled into a rectangular shape, and two cross beams 1 are provided between the mutually opposing members.
5 and 15 are being constructed. And the frame body 12
A plurality of pillars 13 are erected at predetermined positions on the lower surface of. In addition, the shelf boards 14... are connected to the cross beams 15,
15 and between the cross beams 15, 15 and the members of the frame 12 parallel thereto, the beams are installed in parallel with each other at a predetermined distance.

The pallet 11 constructed in this manner has its constituent members, ie, the frame 12, the pillars 13, etc., fixed to each other by welding.

FIG. 2 shows an example of the use of the conventional pallets, in which a plurality of pallets (two pallets in the figure) are stacked on a movable cart 16 and used as a cart for firing ceramics. And ceramic base 17
... is placed between the shelf board 14 of the pallet 11 or between the shelf board 14 and the frame 12, and is sent together with the baking cart into a firing oven (not shown) and heated to 900°C to 1300°C. It will be heated for a certain period of time.

By the way, since the conventional pallets mentioned above are made of heat-resistant metal, they have a lower specific heat and better thermal conductivity than the pallets made of refractory bricks that were used up until then, so there is less heat loss during firing. It had the advantage of having a small amount of heat and therefore excellent firing thermal efficiency.

However, the above-mentioned conventional pallets also have the disadvantage that the pallets undergo large thermal expansion due to the heat during the above-mentioned firing. In other words, the coefficient of linear expansion of the heat-resistant metal used in the above pallet is
Although it varies slightly depending on the content of the added metal,
Generally speaking, it is 10 to ²⁰
It will be displaced by mm. However, the above pillar is
Since it supports the weight of many substrates and the weight of the pallet itself, it presses against the top surface of the moving cart with an extremely large pressure. Therefore, the extremely large frictional force resulting from the reaction force of this pressing force restrains the displacement of the pallet due to thermal expansion, and the pillar cannot easily follow this displacement. Therefore, the actual behavior is that when the temperature of the firing cart rises in the kiln, the pallet begins to expand, but the frictional force between the pillars and the top of the moving cart prevents this expansion. Each member of the pallet is subjected to a restraining force. When the thermal expansion force of each member exceeds this restraining force, the pedestal momentarily causes a strong sliding movement on the upper surface of the movable carriage, and the above-mentioned restraining force is temporarily lost. However, as the temperature rises, each member begins to thermally expand again, so the above-mentioned sliding movement is repeated, and the pillar ends up sliding on the movable carriage intermittently. Moreover, this sliding occurs not only during the heating process for firing, but also during cooling after firing.
Furthermore, this occurs not only in the longitudinal direction of the pallet but also in the lateral direction. This causes severe wear and tear not only on the lower end of the pedestal but also on the upper surface of the movable trolley.

Moreover, as mentioned above, free thermal expansion of each member of the pallet is restricted and the resulting restraining force is repeatedly applied, which has the disadvantage of adversely affecting the life of these members.

The present invention was developed in view of the above circumstances, and the purpose is to provide a pallet that can easily follow thermal distortion caused by heating and cooling during firing, and therefore has extremely little wear and tear on the top surface of the mobile cart and the bottom end of the pillars. Its feature is that a bottom plate is provided at the bottom of each of the adjacent pillars to connect each of the adjacent pillars.

The present invention will be explained below based on the drawings.

3 to 5 show an embodiment of the palette of the present invention.

Reference numeral 1 in the figure indicates a pallet, and this pallet 1 consists of horizontal beams 2, vertical frames 3, made of heat-resistant metal.
..., a horizontal bottom plate 4..., a vertical bottom plate 5..., and a shelf board 6 made of ceramic.

The cross beam 2 further includes a support plate 7, a reinforcing member 8, and a pedestal 9. It is a flat plate member in which a horizontal stepped portion slightly lower than the above-mentioned horizontal portion is formed through continuous curved portions on both sides, and a flat plate-shaped reinforcing member 8 is integrally provided on the lower surface of the flat plate member 8 depending from the horizontal stepped portion. ing. A plurality of pillars 9, each having a cross-shaped cross section, are provided at predetermined positions on the lower surface of the support plate 7. Furthermore, in this embodiment, as shown in FIG. 4, a reinforcing member 8 located approximately in the horizontal center of the support plate 7 bulges downward in a semicircular shape, and a through hole 10 is formed in this semicircular portion. ing. Further, semicircular thick parts are formed in the reinforcing members 8 on the upper parts of the pillars 9, 9 on both sides, and through holes 10, 1 are formed in the thick parts.
0 is formed.

The vertical frames 3 are cylindrical bodies, and are inserted into the through holes 10 of the cross beams 2 to hold the cross beams 2 parallel to each other at predetermined intervals in their longitudinal direction. ing.

In addition, the shelf boards 6 are rectangular members having a rectangular cross section, and are installed on the support plates 7, 7 of the adjacent cross beams 2, 2, respectively.

And the above-mentioned vertical frame 3..., shelf board 6..., support plate 7,
and the reinforcing material 8 constitute a support body.

Further, the pillars 9 at the lower part of the support are provided with horizontal bottom plates 4 and vertical bottom plates 5 on their bottom surfaces. The horizontal bottom plate 4 is provided so as to integrally connect the pillars 9 to each of the horizontal beams 2, and furthermore, the vertical bottom plate 5 is attached to the lower surface of the horizontal bottom plate 4, which is the same as that of each horizontal beam 2. The pillars 9 are provided so as to be integrally connected to each other.

The pallet 1 constructed as described above is placed on a moving cart (not shown) to serve as a cart for firing ceramics, and ceramic blanks (not shown) are placed between the shelf boards 6 of the pallet 1. By the way, in the case of the pallet of this embodiment, as mentioned above, both sides of the support plate 7 on which the shelf boards are placed are formed as stepped parts lower than the central part, so that the shelf boards 6 in the central part in particular... The shelf boards 6 on both sides do not get in the way when placing the substrate on top. Then, the base material placed between the shelf boards 6 is sent into the firing kiln together with the firing trolley and heated at 900° C. to 1300° C. for a certain period of time. By the way, at this time, the pallet 1 has horizontal bottom plates 4 at the bottom of each pillar 9...
Since vertical bottom plates 5 and 5 are provided, the lower ends of these pillars 9 do not contact the upper surface of the moving carriage at an acute angle. Furthermore, in the case of this pallet 1, the weight of the substrate and the weight of the pallet 1 are supported over a wide area by the bottom plates 4, 5, and so on, so that the frictional force with the top surface of the moving carriage is also small. Therefore, during the above heating, the bottom plate 4...
5 expands like the other members of the pallet 1 and continuously slides on the moving carriage, so each of the pillars 9 also moves continuously approximately in parallel. Since the pallet moves in the same manner during cooling, no restraining force against the aforementioned thermal expansion is generated in each member of the pallet.

In addition, for such a pallet, shelf board 6...
Since the shelves are made of ceramic with an extremely low coefficient of linear expansion, these shelf boards 6 do not follow the thermal strain of the members on which they are constructed, and therefore, these shelf boards 6... The base material placed on the top surface of the item also does not shift. Furthermore, these shelf boards 6 have excellent strength, are light in weight, and can be used for a long period of time.

In the description of the embodiment of the present invention, the vertical bottom plate 5 is provided at the bottom of the horizontal bottom plate 4, but the invention is not limited to this. A large number of bottom plates may be provided to connect the bottoms of the pillars 9, 9. Furthermore, if a lattice plate is used as the bottom plate in which each pillar 9 corresponds to the intersection of the vertical plate and the horizontal plate, a better effect can be obtained.

As explained above, since the pallet of the present invention has a bottom plate fixed to the bottom of its pillars to connect them, even if the pallet undergoes thermal distortion due to temperature changes during and after firing, Since the bottom plate follows this and slides on the moving trolley, there is no wear on the lower end of the pillar or the upper surface of the moving trolley, making it possible to use these for a long period of time, making it possible to repair or replace worn parts. material and labor can be saved.

Furthermore, since no unnecessary restraining force is applied to each member of the pallet, each member can withstand use for a longer period of time.

[Brief explanation of the drawing]

Fig. 1 is a perspective view showing an example of a conventional ceramic firing pallet, Fig. 2 is a schematic side view showing its usage condition, and Figs. 3 to 5 show an example of the ceramic firing pallet of the present invention. Figure 3 is a perspective view;
FIG. 4 is a front view, and FIG. 5 is a sectional view taken along the - line in FIG. 4. 1...Palette, 2...Horizontal frame, 3...Vertical frame, 4
...Horizontal bottom plate, 5...Vertical bottom plate, 6...Shelf board, 7...
Support plate, 9... pedestal.

Claims (1)

[Scope of utility model registration request] In a ceramic firing pallet consisting of a support on which a ceramic base is placed and a plurality of pillars erected under the support, the bottom plates connecting the adjacent pillars are attached to the bottoms of these pillars. A palette for firing ceramics characterized by being provided with.