JPH10278021A - Molding equipment for cement moldings - Google Patents

Abstract

PROBLEM TO BE SOLVED: To surely dehydrate excess water contained in a raw material filled between an upper die and a lower die, and to form a molded article in a die by the dewatered water from the raw material. Provided is a molding device for a cement molded product that can suppress wetting. SOLUTION: An upper mold 3 and a lower mold 2 are provided.
2 is provided with drain holes 33 and 24 which are opened on the mold surface, and the excess water of the raw material interposed between the upper die 3 and the lower die 2 is sucked by the suction means 4 into the drain holes 33 and 24. In the molding apparatus for a cement molded product that is sucked and discharged through the mold 24, the upper mold 3 is provided with an air introduction passage 5 that opens to the mold surface 32a of the mold, and the upper mold 3 is provided with the air introduction passage 5 through the air introduction passage 5. Mold surface 3
Air could be introduced between 2a and the raw material.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

TECHNICAL FIELD The present invention relates to an apparatus for molding a cement molding.

[0002]

2. Description of the Related Art Generally, a molding apparatus of this type is provided with an upper mold and a lower mold having a plurality of drain holes, as disclosed in Japanese Utility Model Publication No. 15617/1990. The water contained in the cement raw material interposed between the two molds is sucked by a suction pump through the hole, and the raw material is formed into a desired shape by the upper mold and the lower mold while removing excess moisture in the raw material. I try to press mold.

[0003]

As described above, in the above molding apparatus, when the cement raw material is pressurized by the upper and lower molds, the water contained in the cement raw material is removed by the suction pump through the drain hole. Vacuum dehydration is performed, but when the inside of the drain hole becomes a constant vacuum pressure with the above vacuum dehydration, water stops flowing in the drain hole, and the water removed from the cement raw material is drained to the drain hole. When the remaining molded product is demolded, the water squeezed in the drain hole may flow again between the mold surface of the mold and the surface of the molded product to wet the surface of the molded product. For this reason, there is a problem that the surface of the molded product wetted with water is whitened in the curing process of the molded product, and for example, when the surface of the molded product is coated, the adhesion of the paint to the molded product is reduced.

The present invention has been developed in view of the above circumstances. It is an object of the present invention to surely dehydrate excess water contained in raw materials filled between an upper mold and a lower mold. It is an object of the present invention to provide a molding device for a cement molded product that can be made and that can prevent the molded product in the mold from being wet by water dehydrated from raw materials.

[0005]

In order to achieve the above object, the present invention comprises an upper mold 3 and a lower mold 2, and these molds 3 and 2 have drain holes 33 opened in the mold surface. 24 is provided, and a cement molded product in which the excess moisture of the raw material interposed between the upper mold 3 and the lower mold 2 is suctioned and discharged by the suction means 4 through the drain holes 33 and 24. In at least one of the upper mold 3 and the lower mold 2, an air introduction passage 5 is provided in the mold surface 32 a of the mold, and the mold surface 32 a and the raw material are provided through the air introduction passage 5. Air could be introduced between the two.

[0006]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A molding apparatus for a cement molded product shown in FIG. 1 is for molding a cement molded product 1 having a partially thick portion 10 and basically comprises a lower part. The lower die 2 includes a die 2 and an upper die 3, and the lower die 2 includes a lower die main body 22 installed on a fixed base 21 and a lower die member 23 assembled on the lower die main body 22.

[0007] The lower mold member 23 is for molding the inner surface of the cement molded product 1, and the upper surface thereof is a mold surface 23 a for molding. A large number of formed drain holes 24 are open. At the periphery of the lower surface of the lower mold member 23, a space forming frame 25 is provided.
Are protruded over the entire circumference, and the lower mold member 23 is
In a state where the mounting portion 22a is mounted on the mounting portion 22a,
a drain space 26 is formed between the lower mold member 23 and the lower mold member 23.
7 are laid. The filter medium 27 is formed by the above-mentioned drainage hole 2 formed by the cement compound as a raw material of the cement molding 1.
4 is made of a filter cloth, a wire mesh, or the like, and the filter medium 27 is covered with the above-described space forming frame 25 in a state of covering the periphery of the lower mold member 23. Is fixed by a fixing member 28.

A suction chamber 29 is defined between the lower die body 22 and the fixed base 21, and the suction chamber 29 is
It communicates with the drainage space 26 through a suction hole 22b provided in the mounting portion 22a of the lower die body 22, and is connected to a suction pump 4 as suction means via a suction pipe 41.
On the other hand, the upper die 3 is composed of a movable vertical die 3a and a movable inclined die 3b, and the movable vertical die 3a is
This forms a cavity space serving as the thin portion 11 of the cement molding 1, and the lower surface thereof is a mold surface 31a for molding. The movable vertical mold 3a is driven by driving means (not shown). It can be moved up and down vertically.

The movable inclined mold 3b and the lower mold 2 form a cavity space which becomes the thick portion 10 of the cement molding 1, and can be moved up and down obliquely by driving means (not shown). And The movable inclined mold 3b shown in FIG.
An inclined mold body 31 and a mold member 32 are provided.
The lower surface of the mold member 32 is a mold surface 32a for molding. The mold surface 32a has a large number of drain holes 33 formed in the mold member 32, and the mold surface 32a of the mold member 32 has Similarly to the lower die member 23, a filter medium 34 is laid.

The filter member 34 has its peripheral portion fixed to the peripheral portion on the lower surface of the mold member 32 by a fixing member 35. Further, a suction chamber 36 is defined between the inclined mold body 31 and the mold member 32, and the suction chamber 36
2 and is connected to the above-mentioned suction pump 4 via a suction pipe 42.

In the embodiment shown in FIG.
The opening on the mold surface 23a side of the drain hole 24 formed at the bottom is located above the opening on the drain space 26 side,
The opening on the mold surface 32 a side of the drain hole 33 formed in the mold member 32 is located below the opening on the suction chamber 36 side. Thus, in the above-described molding apparatus, in the embodiment shown in the drawings, the movable inclined mold 3b constituting the upper mold 3 is provided with the air introduction passage 5 which is opened to the mold surface 32a of the mold member 32, and the air introduction passage 5 is provided. 5, air can be introduced into the mold surface 32a.

More specifically, one end of the mold member 32 constituting the movable inclined mold 3b has a mold surface 32a of the mold member 32.
Outside, a pair of air introduction holes 51 each having the other end opened to the suction chamber 36 are formed, and one end in the length direction of the separately formed connecting cylinder 52 is connected to the connection hole formed in the inclined main body 31. The other end in the length direction is connected to a connection hole 53b formed in the mold member 32 in a penetrating manner, and one end in the length direction of the connection cylinder 52 is connected to the air introduction hole 51. .

The other end of the connecting cylinder 52 in the longitudinal direction is connected to an air introducing pipe 54 provided with an opening / closing valve 54a on the way. The above-mentioned air introduction path 5 is formed, and the air sent from the air supply device (not shown) to the above-mentioned air introduction pipe 54 is passed through the connecting cylinder 52 and the air introduction hole 51 to form the mold member 32. It is introduced between the face 32a and the raw material filled in the mold face 32a.

In the figure, reference numeral 55 denotes an O-ring for preventing air from leaking from the air introduction passage 5 to the suction chamber 36. In the above-described molding apparatus, the upper mold 3 and the lower mold 2 compression-mold the raw material interposed in the cavity defined by these two molds 3.2 while driving the suction pump 4 to drive the suction chamber 29. As the pressure in 36 decreases, the water contained in the raw material in the cavity is dehydrated through drain holes 24 and 33.

That is, the portion corresponding to the thin portion 11 of the cement molding 1 is dehydrated through the drain hole 24 of the lower mold 2, while the portion corresponding to the thick portion 10 of the cement molding 1 is The water is dehydrated through both the drain hole 24 of the lower die 2 and the drain hole 33 of the upper die 3, and the dewatered water is collected in the suction chambers 29 and 36, and is appropriately removed. It is discharged outside.

By the way, as described above, the suction pump 5
Dewatering is performed through the drain holes 24 and 33 in accordance with the above.
When the inside of the drain holes 24 and 33 has a constant vacuum pressure, water does not flow through the drain holes, and in particular, the opening of the drain hole 33 formed in the mold member 32 on the mold surface 32 a side is reduced. ,
Because it is located below the opening on the suction chamber 36 side,
Although there is a possibility that squeezed water may accumulate in the drain hole 33, in the molding apparatus of the above embodiment, air flows upstream of the drain hole 33 through the air introduction path 5, that is, the mold member 32.
Is continuously introduced between the mold surface 32a and the raw material filled in the mold surface 32a, so that the pressure does not drop so that water does not flow.

Therefore, the surplus water can be surely dehydrated from the raw material, and the water can be surely discharged from the water draining hole 33. There is no backflow between the mold surface 32a and the surface of the mold. In the above embodiment, the air introduction path 5 is provided in the upper die 3, but may be provided in the lower die 2, or may be provided in both the upper and lower dies 3.

[0018]

As described above, according to the first aspect of the present invention, the upper mold and the lower mold are provided, and these molds are provided with a drain hole opened in the mold surface, and the upper mold and the lower mold are provided. In a molding device for a cement molded product in which the excess moisture of the raw material interposed between the mold and the mold is sucked and discharged through the drainage hole by the suction means, at least one of the upper mold and the lower mold has By providing an air introduction passage opening to the mold surface of the mold, and allowing air to be introduced between the mold surface and the raw material through the air introduction passage, the air is removed during vacuum dehydration of the raw material by the suction means. Is continuously introduced between the mold surface of the mold member and the raw material filled in the mold surface via the air introduction passage,
The drainage hole does not cause a pressure drop such that water does not flow, and therefore, it is possible to surely dehydrate excess water from the raw material, and to reliably discharge the water from the drainage hole. In addition, it is possible to reliably prevent such water squeeze from flowing back between the mold surface of the mold member and the surface of the molded product.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view of a molding device according to the present invention.

FIG. 2 is an enlarged longitudinal sectional view showing a main part of a molding apparatus according to the present invention.

[Explanation of symbols]

 2 Lower mold 24 Drain hole 3 Upper mold 32a Mold surface 33 Drain hole 5 Air introduction path

Claims (1)

[Claims] An upper mold and a lower mold are provided, and these molds are provided with a drainage hole opened in the mold surface, so that excess moisture of raw materials interposed between the upper mold and the lower mold is removed. In a molding device for a cement molded product that is configured to be suction-discharged through the drain hole by a suction unit, at least one of an upper mold and a lower mold is provided with an air introduction path that opens to a mold surface of the mold. A molding device for a cement molding, wherein air can be introduced between the mold surface and the raw material through the air introduction passage.