JPH1158349A - Tray for cement molding - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a tray of a low cost with small deformation of a cement molding even in the case of using it for manufacturing the molding having a wide width without largely altering a structure of the tray which has been heretofore used. SOLUTION: A thickness correcting plate 13 having a thickness corresponding to a deflection of a sticker 112 caused by a load is mounted at a lateral center of the sticker 112 of a frame obtained by assembling, for example posts 111 and the sticker 112 in a ladder state of the tray 1 for a cement molding having the plate 13 mounted at a lower part of a surface plate of a site where a largest deflection occurs by the load of the molding. And, then, the tray 1 having the plate 13 disposed thereon is used.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cement molded product, and more particularly to a tray suitable for producing a wide cement molded product.

[0002]

2. Description of the Related Art In the production of molded cement, it is soft and easily deformed after molding and before curing and curing are completed, and it is difficult to directly handle them.
Therefore, conventionally, in manufacturing a cement molded product, a large number of trays are prepared, the molded product is sequentially received on the tray, cured after being placed on the tray, and then removed to remove the cement molded product. Was manufactured in a way to obtain. In addition to the need for many trays in the manufacturing process and the need to transport and stack them, they are inexpensive and lightweight. It is desired that the tray itself has high dimensional accuracy and is hardly deformed because it directly affects the surface smoothness and dimensional accuracy of the product.

However, recently, it has been required to supply a cement molded product having a wider width than the conventional one, and a conventionally used column and a pier are assembled on a ladder-like metal frame. In the tray (FIG. 3) having the structure in which the metal surface plate is covered, since the length of the pier passed in the width direction of the frame is also longer, the pier is bent downward by the load of the cement molded product, and as a result, the resulting pier is obtained. There was a problem that the shape of the cement molded product was different from the shape at the time of molding (FIG. 4B). Therefore, it is necessary to form a cement molded product slightly larger than the standard value in advance, and to remove the deformed portion by means of polishing or the like later, which requires an extra step and at the same time lowers the yield and increases the cost. It was with.

[0004] Such deflection of the pier is basically caused by the load of the cement molded product and the Young's modulus, cross-sectional area of the pier or the interval between the piers. Although it can be prevented, in practice, using a large number of piers by narrowing the spacing of the piers, or using a pier with a large cross-sectional area, that is, a large withstand load will lead to weight increase and cost increase It was extremely difficult.

[0005]

SUMMARY OF THE INVENTION According to the present invention, the structure of a conventionally used tray is not largely changed.
An object of the present invention is to provide an inexpensive tray with less deformation of a cement molded product even when used for manufacturing a wide cement molded product.

[0006]

The inventors of the present invention have conducted intensive studies to solve the above-mentioned problems, and as a result, the bending is the largest, for example, the amount of bending is large at the lower part of the surface plate in the longitudinal direction of the center of the crosspiece. If the surface plate is deformed upward in advance by installing a thickness correction plate with a thickness equivalent to the thickness, the deformation is corrected by the load when placing the cement molded product, and the cement molded product according to the dimensions at the time of molding Have been obtained, and the present invention has been accomplished.

That is, the present invention is characterized in that a thickness compensating plate having a thickness corresponding to the magnitude of the flexure is attached to the lower part of the surface plate at the portion where the flexure caused by the load of the cement molded product is greatest. The article tray is the gist.

[0008]

Embodiments of the present invention will be described below in detail. FIG. 1 is a partially cutaway perspective view showing an example of a tray 1 for a cement molded product of the present invention, and FIG.
1 is a schematic cross-sectional view taken along the line XX ′ of FIG. 1 before the cement molded product 2 is placed, and FIG.
It is an X 'cross section schematic diagram. The cement molded product tray 1 of the present invention generally comprises a frame 11, a surface plate 12, and a thickness correction plate 13. The frame 11 and the surface plate 12 used for the tray 1 are generally prismatic or hollow using ordinary iron or stainless steel. The structure of the frame 11 of the tray 1 is shown in FIG.
It is clear from FIG. 2 that the two columns 11 are parallel to the longitudinal direction.
1 and a plurality of piers 112 at appropriate intervals parallel to the width direction.
It is preferable to use a structure in which the columns are connected to each other and assembled in a ladder shape in terms of robustness, light weight, ease of manufacture, and cost. At this time, the length of the crosspiece 112 can be appropriately selected depending on the cement molded product 2, but in the present invention, the length of the crosspiece 112 is 600 mm or more, that is, suitable for manufacturing a cement molded product 2 having a product width of 600 mm or more. Can be used for Further, as the surface plate 12, a normal metal plate can be used without any particular limitation.

The greatest feature of the present invention is that a thickness compensating plate 13 is used in addition to the frame 11 and the surface plate 12 described above. The thickness correction plate 13 is mounted between the above-described portion of the frame 11 where the flexure is greatest and the surface plate 12. In addition, a metal plate having an appropriate width is usually used as the thickness correction plate 13, and the thickness of the thickness correction plate 13 is determined by the amount of deflection of the frame 11 caused by the load of the molded product 2 when the molded product 2 is placed thereon. Is used. Generally, the thickness of the thickness correction plate 13 is preferably about 0.2 to 1.0 mm, since it is generally a matter of material design that the degree of deflection exceeds 1 mm.

Therefore, when the ladder-shaped frame 11 as described above is employed, the center of the crosspiece 112 in the width direction is most easily bent. . In this case, there is no particular limitation on how to attach the thickness correction plate 13,
For example, a method of covering the center of each bar 12 or a method of attaching the bar to the center of the bar 12 in the width direction using a long thickness correction plate 13 and straddling each bar 12 can be used. It is preferable for work to cover the center of the crosspiece 12 with the thickness correction plate 13.

The cement molded product tray 1 of the present invention
Is applicable to the production of all types of cement molded products, but in particular, has a low viscosity, yet has thixotropy, and easily deforms during handling, for example,
It is preferable to apply the present invention to molding when a cement-containing inverse emulsion composition comprising cement, water, and an oily substance is used as a cement-based molding material.

[0012]

According to the present invention, as shown in FIG. 4, the conventionally used cement molded product tray 1 'is flat when the cement molded product 2 is not placed (FIG. 4 (a)).
However, when the cement molded article 2 is placed, it curves concavely (FIG. 4B), and the resulting cement molded article 2 is deformed, whereas the cement molded article tray of the present invention is deformed. When the cement molded product 2 is not placed, the surface plate 13 is lifted by the action of the thickness correction plate 13 and thus is curved in a convex shape (FIG. 2A). And the convex portion is bent to be on a plane (FIG. 2B), so that a cement molded product 2 having the dimensions at the time of molding can be obtained.

[0013]

The tray for cement molded articles of the present invention can be obtained at low cost and easily because only the thickness correction plate 13 needs to be added to the conventionally used tray.
In addition, since the obtained cement molded product is not deformed, a post-process for polishing and cutting can be omitted, and the yield is improved. Therefore, the present invention makes a great contribution to the production of cement moldings, especially extruded cement boards.

[Brief description of the drawings]

FIG. 1 is a partially cut-away perspective view illustrating a cement molded product tray 1 according to one embodiment of the present invention.

FIG. 2 is a schematic cross-sectional view taken along the line XX ′ in a state where (a) the cement molded product 2 is not placed on the tray 1 shown in FIG. 1;
(B) is a schematic cross-sectional view taken along line XX ′ in a mounted state.

FIG. 3 is a partially cutaway perspective view illustrating a conventional cement molded product tray 1 ′.

FIG. 4 is a schematic sectional view taken along the line YY ′ in a state where (a) the cement molded article 2 is not placed on the tray 1 ′ shown in FIG. 2;
(B) is a schematic cross-sectional view taken along the line YY 'in the mounted state.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Cement molded product tray 1 'of the present invention 1' Conventional cement molded product tray 11 Frame 111 Strut 112 Crosspiece 12 Surface plate 13 Thickness correction plate 2 Cement molded product

 ──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Hidekazu Nakatsuka 1-4-1 Shinsenri-Nishimachi, Toyonaka-shi, Osaka National Housing Industry Co., Ltd. (72) Inventor Shigeo Yoshida 1-1-1, Shinsenri-Nishimachi, Toyonaka-shi, Osaka No. 4 Inside the National Housing Industry Co., Ltd.

Claims (3)

[Claims] 1. A cement molded product tray, wherein a thickness compensating plate having a thickness corresponding to the magnitude of the flexure is attached to a lower portion of the surface plate 1 at a portion where the flexure caused by the load of the cement molded product is greatest. . 2. The tray according to claim 1, wherein the thickness correction plate is mounted at the center of the tray in the width direction. 3. A cement molding according to claim 1, wherein the cement molding comprises a cement-containing inverse emulsion composition comprising cement, water and an oily substance as a cement molding material. Goods tray.