JP2000313006A - Apparatus for molding inorganic hydraulic molded article - Google Patents

Abstract

PROBLEM TO BE SOLVED: To efficiently perform releasing from the molding face of a mold and to improve suction properties of a molded article to a top mold by pushing up directly the molded article consisting of an inorg. hydraulic material such as e.g. cement mortar, clay, ceramic and gypsum by means of a rod valve to perform releasing from the molding face and jetting a jetting gas from a releasing gas jetting hole provided on the molding face in relation to an apparatus for an inorg. hydraulic molded article. SOLUTION: Through-hole parts 4 for performing water squeezing and air suction of a molded article are provided on the molding face S1 of one of molds consisting of a top mold 1 and a bottom mold 2 and a releasing gas jetting hole 5 is provided on the molding face S2 of another mold and a rod valve 7 is inserted and arranged in a gas feeding passage 6 at the height where the apex part 7a closes the releasing gas jetting hole and below the rod valve, a water draining valve 9 which makes the rod valve forcibly project is provided movably up and down in a gas feeding passage.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an apparatus for molding an inorganic hydraulic molded article, for example, by molding a molded article made of an inorganic hydraulic material such as cement mortar, clay, ceramic, gypsum, etc. directly from below by a rod-shaped valve. The mold is released from the surface and the release gas is injected from the gas injection holes provided on the molding surface to efficiently release the molded product from the molding surface of the mold. I helped the sex.

[0002]

2. Description of the Related Art Conventionally, an apparatus for molding an inorganic hydraulic molded product, for example, a molded product of cement mortar has been disclosed in Japanese Patent Publication No. 5-8864.
There is an invention described in Japanese Patent Publication No. 2 (JP-A) No. 2 (1994). That is, as shown in FIG. 7, one of the molds composed of the upper mold a and the lower mold b, that is, a plurality of molds provided for performing water squeezing and suction on the molding surface c of the upper mold a when compressing the molded product N. A through hole d, a plurality of release gas injection holes f opening to a molding surface e of the lower mold b as the other mold, and a molding surface e of the lower mold b through the release gas injection holes f. And a gas supply passage g provided in the lower mold b as the other mold, and the molding material N ′ is connected to the molding surface e of the mold.
From the point of supply to the mold release start point after the completion of molding, between the closed position where the mold release gas injection hole f is flush with the molding surface e and the open position where the molding surface e communicates with the gas supply passage g. And a rod-shaped valve h movable between two positions. Then, a molding material N ′ such as cement mortar made of an inorganic hydraulic material is charged into the molding surface of the upper mold a and the lower mold b as a mold, and at least one of the upper mold a and the lower mold b is the other. Then, the molded product N is pressed and compressed by being moved in a direction opposite to the above, and is squeezed and absorbed through a plurality of through-holes d provided in a molding surface c of an upper die a as a mold to form a molded product N. Next, the upper mold a as one mold is moved in a direction opposite to the lower mold b as the other mold, and a plurality of separation molds provided on the molding surface e of the lower mold b as one mold are moved. Mold gas injection hole f
The molded product N is released from the mold by injecting a release gas G. Then, the molding surface c of the upper mold a as the other mold is evacuated through a plurality of through holes d to form a molding surface c of one mold.
The molded product N is adsorbed on the substrate.

[0003]

FIG. 7 shows a conventional cement mortar molded product molding apparatus shown in FIG.
Molded article N which is compression molded by mutual dies comprising
Is merely to release the molded product N by injecting the release gas G through a plurality of release gas injection holes f provided on the molding surface e of the lower die b as one mold. And
The molded product N is vacuum-sucked through a plurality of through-holes d provided in the molding surface c of the upper die a as the other die.
As described above, the conventional cement mortar molded product molding apparatus releases the molded product N only by injecting the release gas G. Therefore, it takes a lot of time to release the molded product N. Was inefficient. Moreover, since the mold release of the molded product N is poor, the molded product N with respect to the upper die a as the other mold is used.
The adsorption efficiency was low, the molding cycle was long and inefficient. Also, a molded product N formed by a mold comprising an upper mold a and a lower mold b
Of the lower mold b as one mold during the compression molding of
And a plurality of release gas injection holes f provided in the
Since moisture contained in the molded product N from the gap between the top portion h ₁ of the rod-like valve h is inserted from entering the inside, release the moisture after molding of the molded article N by the upper mold a and the lower mold b Injection was again performed from the gas injection holes f to the surface of the molded product N, and the surface of the bent molded product N was damaged, and there was a problem that molding could not be performed with clean finishing accuracy. The present invention solves the above-mentioned conventional inconvenience, and at the time of releasing the molded product, the molded product is directly lifted up from below by a rod-shaped valve disposed in a gas supply passage provided in one of the molds to release the molded product. By releasing the release gas from the release gas injection holes, the release of the molded product from the molding surface of the mold is performed efficiently, and the absorption of the molded product to the upper die is further promoted, thus significantly improving the efficiency of the molding cycle. In addition, during the molding of the molded article, the water that enters into the gas supply passage from the gap between the plurality of release gas injection holes and the tip of the rod-shaped valve is drained to the outside to ensure the surface of the molded article. It is an object of the present invention to provide a high-precision molding apparatus for an inorganic hydraulic molded article without impairing the finishing accuracy.

[0004]

Means for Solving the Problems The present invention has been made in view of the above-mentioned problems, and a first aspect of the present invention is to squeeze water when compressing a molded product on one molding surface of a mold composed of an upper mold and a lower mold. A plurality of through-holes provided for performing suction, a release gas injection hole that opens to the molding surface of the other mold, and the other mold that communicates with the molding surface through the release gas injection hole. A gas supply passage provided in the mold, a closing position in which the mold release gas injection hole is closed and flush with the molding surface from the time when the molding material is supplied to the molding surface of the mold to the time when mold release is started after molding is completed, and A rod-shaped valve movably provided between two positions in a gas supply passage between a molding surface and an open position communicating the gas supply passage, and injecting a release gas from a release gas injection hole after completion of molding of the molded product. In the molding apparatus for an inorganic hydraulic molded product that performs mold release, the tip of the rod-shaped valve is released. A gas supply passage is provided in a gas supply passage having a gas introduction hole on one side at a height that closes the gas injection hole, and is provided so as to be able to press a molded product, and a drain valve is vertically movable with respect to the rod-shaped valve. The means of providing in the passage was adopted.

According to a second aspect of the present invention, in the first aspect, the rod-shaped valve is formed separately from the drain valve so that a spring member is interposed between the rod-shaped valve and the other mold. The tip is disposed in the gas supply passage at a height that closes the release gas injection hole, and the drain valve is provided to be able to forcibly project the rod-shaped valve against the spring force of the spring material. The feature that was characterized by was adopted.

According to a third aspect of the present invention, in the first aspect, the rod-shaped valve is formed integrally with the drain valve so that the tip can move up and down into the gas supply passage at a height that closes the release gas injection hole. Means of being inserted is adopted.

According to a fourth aspect of the present invention, the tip of the rod-shaped valve according to any one of the first, second, and third aspects and the inner periphery of the release gas injection hole into which the tip is inserted. A drainage gap that can communicate with the gas supply passage is formed between
The opening and closing of the drain valve allows drainage during molding to be introduced into the gas supply passage through the drainage gap and drainage is controlled.

According to a fifth aspect of the present invention, there is provided a rod-shaped valve disposed in a gas supply passage provided in one of the upper and lower molds, and a spring for holding the rod-shaped valve. A means is employed in which a desired number of materials are provided for a mold.

According to a sixth aspect of the present invention, there is provided a means according to the first aspect, wherein the through hole is provided on a molding surface of an upper mold, and a release gas injection hole is provided on a molding surface of a lower mold. Adopted.

According to a seventh aspect of the present invention, there is provided a means according to the first aspect, wherein the through hole is provided on a molding surface of a lower mold, and a release gas injection hole is provided on a molding surface of an upper mold. Adopted.

According to an eighth aspect of the present invention, in the fourth aspect, the drainage gap formed at the distal end of the rod-shaped valve with respect to the release gas injection hole is provided with respect to the release gas injection hole having a substantially circular cross-sectional area. The present invention adopts a means characterized by being formed in a constant reduced diameter portion having a substantially square planar shape.

According to a ninth aspect of the present invention, in any one of the first, second, and third aspects, the drain valve moves up and down between a drain position and a water stop position through a hydraulic circuit by driving a cylinder. Means of being switched is adopted.

[0013]

Embodiments of the present invention will be described below with reference to the drawings. 1 and 6 show one embodiment of the present invention. 1 is an upper mold as a mold, 2 is an upper mold 1
Is a lower mold that is disposed below and opposite to. The upper die 1 and the lower die 2 as these dies move up and down in the direction facing each other or away from each other by driving a cylinder (not shown) with respect to the other, or the upper die 1 and the lower die 2 moves up and down in a direction facing each other or in a direction away from each other to form a molded product N. Reference numeral 3 denotes a mold frame which moves up and down on the outer periphery of the lower mold 2 as a lower mold by driving a cylinder (not shown).

Then, one of the upper mold 1 and the lower mold 2 is shown in the drawing.
In this embodiment, the molding surface S of the upper mold 1 is₁When molding molded article N
Multiple holes provided for water extraction and suction
4 and the molding surface S of the lower mold 2 as the other mold_TwoOpen to
A plurality of release gas injection holes 5 through the release gas injection holes 5
And the molding surface S_TwoTo the lower mold as the other mold
2 and a molding material N '
Molding surface S of mold 2_TwoRelease from the point of supply to the mold after molding
Until the start point, the release gas injection hole 5 is closed and the molding surface S_Two
Moved from the closed position and the release gas injection hole 5 which are flush with
The molding surface S_TwoAnd the gas supply passage 6
And a rod-shaped valve 7 that can move between two positions:
After the molding of the molded article N, the release gas G is discharged from the release gas injection holes 5.
The molded product N is released by injection. In addition,
The hole 4 is formed on the molding surface S of the upper die 1 above. ₁And release gas injection
The injection hole 5 is formed on the lower molding surface S of the lower mold 2._TwoThe points provided in
This is the same as the conventional molding device for molding such as shown in FIG.
As the molding material N ′ for molding the molded product N,
For example, cement mortar, clay, ceramic, plaster, etc.
A hydraulic inorganic material is used.

In the present embodiment, the rod-shaped valve 7 has a front end 7a formed by a spring member 8 interposed between the rod-shaped valve 7 and the lower mold 2 as the other mold. The drain valve 9 is disposed in a gas supply passage 6 having a release gas injection hole 5 so as to be able to directly push up, and the drain valve 9 capable of forcibly protruding the rod-shaped valve 7 against the spring force of the spring material 8 is moved up and down. It is movably provided separately below the gas supply passage 6. The spring member 8 is illustrated for easily performing and holding the assembly of the rod-shaped valve 7 with respect to the lower mold 2 and for ensuring the vertical movement of the rod-shaped valve 7 by exerting an even and uniform spring force. Such a coil spring is optimally used. The reason why the rod-shaped valve 7 held by the spring member 8 can be protruded against the spring force of the spring member 8 at the tip of the drain valve 9 provided separately and separately is as follows.
It is necessary to manufacture and assemble the rod-shaped valve 7 with respect to the release gas injection hole 5 and to assemble the drainage valve 9 having the large-diameter outer peripheral portion 9a and the small-diameter portion 9b with respect to the valve seat 6a of the gas supply passage 6. Even if the height is not increased as described above, the vertical movement and the opening / closing operation of the rod-shaped valve 7 with respect to the release gas injection hole 5 are surely performed so that the release gas G is controlled and the drainage from the molded article N to the outside is reliably performed. It is.

7a₁Represents the rod-shaped valve 7 as shown in FIG.
Tip 7a and release gas injection for inserting tip 7a
Can communicate with the lower gas supply passage 6 between the inner periphery of the injection hole 5 and
The drainage gap formed in the drainage gap 7a₁Is horizontal
The cross-sectional area T is flat with respect to the release gas injection hole 5 whose plane is substantially circular.
A constant reduced diameter portion 7a having a substantially rectangular shape_TwoIs formed
This reduced diameter portion 7a_TwoFormed on the outer periphery of In addition,
Small diameter part 7a_TwoIn the illustrated embodiment,
Constant reduced diameter part 7a_TwoThis is a typical example
And not limited to those shown in the drawings, the plane is substantially pentagonal, and the plane is substantially six.
It may be a polygon, such as a polygon or a substantially planar octagon. In short,
When the rod-shaped valve 7 separates from the release gas injection hole 5, the release gas
Drain gap 7a between injection hole 5 ₁Is formed
And the discharge of the release gas G
Should be performed.

The rod-shaped drain valve 9 for switching the rod valve 7 between a drain position and a water stop position is provided with a hydraulic circuit 10
The cylinder 11 moves up and down by driving the cylinder 11. 11a is a piston portion of the cylinder 11,
The drain valve 9 is attached to the tip of the piston 11a. When the rod-shaped valve 7 in which the piston portion 11a of the cylinder 11 as a drive source rises when the molded product N is released from the mold, the large-diameter outer peripheral portion 9a is connected to the gas supply passage 6.
When the gas supply passage 6 is closed by being inserted into an annular valve seat 6 a provided on the inner periphery of the lower part of the valve, the release gas G introduced into the gas supply passage 6 through the gas introduction hole 12 is separated upward. performing a release of the molded article N against the forming surface S ₂ of the lower die 2 by ejecting the molded article N from the mold gas injection holes 5. In addition, when the piston portion 11a of the cylinder 11 descends, the large-diameter outer peripheral portion 9a is inserted and removed from the valve seat 6a on the upper outer periphery of the drain valve 9 to open the valve. A small-diameter portion 9b is formed to form a gap 14 through which intruded moisture can be communicated so as to be drained from a drain hole 13 provided at a lower outer periphery of the gas supply passage 6 located below the large-diameter outer peripheral portion 9a. .

[0018] 15 is a filter plate device attached to the molding surface S ₁ of the upper mold 1 as the die, the filtration plate 15 is dehydrated fabric 1 so as to suction dewatering during molding of the molded product N
6, a wire mesh 17, and a draining iron plate 18 are superposed.

One embodiment of the present invention has the above configuration.
In order to form the molded product N, a cylinder (not shown) is driven with respect to one of the lower molds 2 of the mold to raise the mold frame 3,
A desired amount of, for example, cement mortar made of an inorganic hydraulic material as a molding material is put into a molding space surrounded by the lower mold 2 and the mold frame 3 (see FIG. 1). Then, another cylinder (not shown) is driven to lower or raise one of the upper mold 1 or the lower mold 2 as a mold in a direction facing the other, or to move the upper mold 1 and the lower mold 1 By raising or lowering both molds 2 in opposite directions, the upper mold 1
And the lower mold 2 press and compress the molding material N '. And
Molding the upper mold 1 for forming surface S molded article N by performing dewatering and intake by vacuum suction by a vacuum pump not shown in FIG moisture arising from articles N through a plurality of holes 4 provided in the ₁ This is the same as the conventional molding apparatus. At this time,
As shown in FIG. 2, one lower mold 2 of the mold has a molding surface S _2.
A gas supply passage 6 is provided for communicating, moldings held tip 7a of the rod-shaped valve 7 which is inserted distribution in the gas supply passage 6 by a spring member 8 at a height that matches the molding surface S ₂ The release gas injection holes 5 are closed so that N is formed,
Water generated from the molded article N is prevented from entering the gas supply passage 6.

Further, the piston portion 11a of the cylinder 11 is lowered, and the drain valve 9 attached to the tip of the piston portion 11a is connected to the lower end of the rod-shaped valve 7 inserted in the gas supply passage 6 as shown in FIG. And a small-diameter portion 9b formed on the upper outer periphery of the drain valve 9 is detached from a valve seat 6a provided at a lower portion of the gas supply passage 6, and a gap is formed between the small-diameter portion 9b and the valve seat 6a. Since the drain valve 14 is formed and the drain valve 9 is opened, the water that has entered the gas supply passage 6 is drained from the drain hole 13 to the outside of the mold. For this reason, the moisture generated from the molded product N entering the gas supply passage 6 is
As will be described later, the inconvenience of impairing the finishing accuracy of the surface by vigorously colliding with the surface of the molded article N which has been angle-press formed by the pressure of the release gas G injected from the release gas injection hole 5 is eliminated. can do.

In this embodiment, when the molded product N is released from the mold, as shown in FIG. 3, the upper mold 1 of one of the molds is slightly raised by about several mm with respect to the lower mold 2 of the other mold. Thereafter, when the cylinder 11 is driven and the piston 11a is extended, the drain valve 9 attached to the piston 11a is closed by being inserted into a valve seat 6a provided in a lower portion of the gas supply passage 6. As a result, the state of communication with the drain hole 13 is cut off, and the distal end projects the rod-shaped valve 7 upward against the spring force of the spring member 8. For this reason, the tip 7 of the rod-shaped valve 7
molded article N by a lower surface is pushed up, the release from the molding surface S ₂ of the lower die 2 is performed directly. Moreover, since the tip portion 7a of the rod-shaped valve 7 opens the blockage of the gas injection hole 5 communicating with the molding surface S ₂ of the lower die 2 by raising against the forming surface S _2, gas from releasing the gas introducing hole 5 The release gas G introduced into the supply passage 6 is ejected from the release gas injection holes 5 to push up the molded product N, and the mold is formed together with the mold release by directly pushing up the rod-shaped valve 7 as described above. Release the product N quickly and efficiently. In the embodiment shown in the drawings, one rod-shaped valve 6 and one release gas injection hole 5 are provided in the lower die 2 to be inserted into the gas supply passage 6. The number of installations can be freely increased or decreased according to the size of the area, the weight of the molded product N, the state of water squeezing, and the like.

In addition, the release gas G injected from the release gas injection hole 5 pushes up the lower surface of the upper die 1 so as to be adsorbed on the molding surface S ₁ through the plurality of through holes 4 provided on the molding surface S ₁ of the upper die 1. Adsorption of the molded article N to the upper mold 1 is promoted to increase the adsorption efficiency, and the molding cycle is shortened. Thereafter, the upper mold 1 by suction the molded article N the forming surface S ₁ moves it horizontally after rising to the desired height, placed on a pedestal not shown moldings N in the figure, the molded article N Perform delivery. Then, the upper mold 1 is horizontally moved to the previous position to the position where it is aligned with the lower mold 2, and one cycle of molding the molded product N is completed.

In the illustrated embodiment, a plurality of through holes 4 are provided in the upper mold 1 as one of the molds to suction and squeeze the molded product N, and the gas supply passage 6 is formed in the lower mold 2. A rod-shaped valve 7 provided in the gas supply passage 6, a spring member 8 for holding the rod-shaped valve 7, and a drain valve 9 for projecting the rod-shaped valve 7 against the spring force of the spring member 8. In addition to directly protruding the molded product N by the rod-shaped valve 7 by showing one, the release gas G is jetted to the molded product N to release the molded product quickly and reliably. However, by providing a plurality of gas supply passages 6, rod-shaped valves 7, spring members 8, and drain valves 9 in accordance with the width of the lower area of the molded product N, the weight of the molded product N, the water squeezing state, etc. An average force is applied to the molded product N, and the molded product N is more quickly and efficiently than the above-mentioned embodiment without cracking or shape collapse. To be to perform mold release, yet established number is not limited to the above description, the increase and decrease change be freely.

In the above-described embodiment, the rod-shaped valve 7 is disposed in the gas supply passage 6 at a height that closes the release gas injection hole 5.
The drain valve 9 is formed separately so that the rod valve 7 can be forcibly protruded by the drain valve 9 against the spring force of the spring material 8, but the rod valve is not shown in the drawing. The gas supply passage 6 is formed integrally with the drain valve 9 so that the tip 7 a closes the release gas injection hole 5 without using the spring material 8.
It can be arranged so as to be movable up and down by driving the cylinder 11.

Further, in the above embodiment shown, a plurality of through holes 4 in the forming surface S ₁ of one of the upper mold 1 in the mold, a rod-shaped valve 7 the forming surface S ₂ of the other of the lower mold 2 is provided with the release gas injection hole 5 for injecting release gas G with distribution interpolation, the hole portion 4 is provided on the molding surface S ₂ of the lower die 2 in the opposite, the molding surface of upper mold 1 S _A release gas injection hole 5 can be provided in ₂ .

[0026]

As described above, according to the first aspect of the present invention, a plurality of passages provided for performing water squeezing and suction when compressing a molded product on one molding surface of a mold including an upper mold and a lower mold. A hole, a plurality of release gas injection holes opened on the molding surface of the other mold, and a gas supply passage provided in the other mold in communication with the molding surface via the release gas injection holes. From the time when the molding material is supplied to the molding surface of the mold to the time when the mold is released after the completion of molding, the mold release gas injection hole is closed and the closed position and the molding surface and the gas supply passage are flush with the molding surface. A rod-shaped valve movable between two positions in a gas supply passage with an open position communicating therewith, and an inorganic hydraulic molding for releasing the mold by injecting a release gas from a release gas injection hole after molding of the molded article is completed. In the device for molding a product, the rod-shaped valve is set at a height such that the tip thereof closes the release gas injection hole. A molded product is provided in the gas supply passage having an inlet on one side so as to be able to push up the molded product, and a drain valve is provided in the gas supply passage so as to be vertically movable with respect to the rod-shaped valve. At the time of molding, the molded product is directly lifted up from below by a rod-shaped valve inserted in a gas supply passage provided in one side of the mold to release the mold, and the mold release gas is injected from the mold release gas injection hole. The mold can be efficiently released from the molding surface. In addition, it assists the adsorption of the molded product to the upper mold, and can significantly improve the molding cycle.Furthermore, when molding the molded product, the gap between the plurality of release gas injection holes and the tip of the rod-shaped valve is increased. It is possible to form a highly accurate inorganic hydraulic molded product without losing the water flowing into the gas injection passage to the outside without impairing the finishing accuracy with respect to the surface of the molded product.

According to a second aspect of the present invention, the rod-shaped valve is formed separately from the drain valve so that the distal end portion is formed by a spring material interposed between the rod-shaped valve and the other mold. Is disposed in the gas supply passage at a height that closes the release gas injection hole, and the drain valve is provided so as to be able to forcibly project the rod-shaped valve against the spring force of the spring material. Therefore, the drain valve forcibly pushes up the rod-shaped valve against the spring force of the spring material, the tip protrudes from the release gas injection hole, and directly pushes up the molded product made of inorganic hydraulic molded product by the rod-shaped valve. The mold is released from the molding surface and the release gas is jetted from the release gas injection hole, so that the molded product can be released efficiently.

According to a third aspect of the present invention, the rod-shaped valve is formed integrally with the drain valve and is vertically movably disposed in the gas supply passage at a height at which the tip thereof closes the release gas injection hole. The rod-shaped valve moves up and down into the gas supply passage integrally with the drain valve, pushes up the molded product by the rod-shaped valve, releases the mold from the molding surface, and releases the release gas from the release gas injection hole. Can be efficiently released from the molded product, the number of parts is small, and production and assembly are easy.

According to a fourth aspect of the present invention, a drainage gap is formed between the distal end of the rod-shaped valve and the inner periphery of the gas injection hole into which the distal end is inserted. By opening and closing the drain valve, drainage during molding is introduced into the gas supply passage through the drainage gap, so that drainage can be quickly and reliably drained and controlled.

According to the eighth aspect of the present invention, the drainage gap formed at the distal end of the rod-shaped valve with respect to the release gas injection hole is substantially planar with respect to the release gas injection hole having a substantially circular cross-sectional area. Because it is formed in a constant reduced diameter portion that forms a square, the tip of the rod-shaped valve coincides with the molding surface and closes the release gas injection hole during molding of the molded product, contributing to molding,
It is possible to prevent moisture generated from the molded product from entering the gas supply passage and to prevent the molded product from being ejected to the molded product when the release gas is injected, and to use one part for several functions. It is easy to manufacture and assemble and compact.

According to the ninth aspect of the present invention, the drain valve disposed in the gas supply passage together with the rod-shaped valve moves up and down between the drain position and the water stop position through the hydraulic circuit driven by the cylinder to improve the response. Since the switching operation is performed, opening and closing the rod-shaped valve prevents moisture from entering the gas supply passage from the molded product at the time of molding, and quickly and reliably releases the release gas from the release gas injection hole at the time of release. It has the advantage that it can be ejected and that the water from the molded article that has entered the gas supply passage can be reliably drained to the outside of the mold.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view showing an embodiment of an apparatus for molding an inorganic hydraulic molded article according to the present invention, in which a molding material is charged into a molding surface of a mold.

FIG. 2 is a cross-sectional view of the molded product during molding.

FIG. 3 is a sectional view of the molded product when it is released from the mold.

FIG. 4 is an enlarged sectional view taken along line AA of FIG. 3;

FIG. 5 is an enlarged sectional view taken along line BB of FIG. 3;

FIG. 6 is an exploded perspective view showing the tip of a rod-shaped valve and a release gas injection hole.

FIG. 7 is a cross-sectional view showing an example of a conventional apparatus for forming an inorganic hydraulic molded product.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 Upper die 2 Lower die 3 Mold frame 4 Through-hole part 5 Release gas injection hole 6 Gas supply passage 7 Rod-shaped valve 7a Tip part 7a ₁ Drainage gap 7a ₂ Reduced diameter part 8 Spring material 9 Drain valve 9a Outer peripheral large diameter part 9b the small diameter portion 11 cylinder N molded article S ₁ forming surface S ₂ forming surface

 ──────────────────────────────────────────────────続 き Continued on the front page F term (reference) 4G053 AA07 BA02 BE12 4G054 AA01 AA02 BA23 BA24 BA25 BA76 4G055 AA01 AB01 CB06

Claims (9)

[Claims] 1. A plurality of through holes provided on one molding surface of a mold comprising an upper mold and a lower mold for performing water squeezing and suction during compression of a molded product, and a molding surface of the other mold. A releasing gas injection hole that opens, a gas supply passage provided in the other mold in communication with the molding surface via the releasing gas injection hole,
The mold release gas injection hole is closed from the time when the molding material is supplied to the molding surface of the mold to the time when mold release is started after the molding is completed, and the closing position that is flush with the molding surface and the molding surface and the gas supply passage are communicated. A rod-shaped valve movably provided between two positions in a gas supply passage with an open position, and an inorganic hydraulic molding for releasing the mold by injecting a release gas from a release gas injection hole after molding of the molded article is completed. In the device for molding a product, the rod-shaped valve is provided so as to be able to press the molded product by being inserted into a gas supply passage having a gas introduction hole on one side at a height at which a tip portion closes the release gas injection hole, A molding device for an inorganic hydraulic molded product, wherein a drain valve is provided in the gas supply passage so as to be vertically movable with respect to the rod-shaped valve. 2. The rod-shaped valve is formed separately from the drain valve, so that the distal end of the rod-shaped valve closes the release gas injection hole by a spring material interposed between the rod-shaped valve and the other mold. 2. The inorganic material according to claim 1, wherein the drain valve is disposed at a height within the gas supply passage, and the drain valve is provided so as to be able to forcibly project the rod-shaped valve against the spring force of the spring material. Molding equipment for hydraulic molded products. 3. The gas valve according to claim 1, wherein the rod-shaped valve is formed integrally with the drain valve, and is vertically movably disposed in the gas supply passage at a height at which a tip portion closes the release gas injection hole. The molding device for an inorganic hydraulic molded product according to item 1. 4. A drain gap is formed between a tip of the rod-shaped valve and an inner periphery of a release gas injection hole into which the tip is inserted, the drain gap being capable of communicating with a gas supply passage. The drainage during molding is introduced into the gas supply passage through the drainage gap to control the drainage.
A molding apparatus for an inorganic hydraulic molded product according to claim 2 or 3. 5. A rod-shaped valve disposed in a gas supply passage provided in one of a mold having an upper mold and a lower mold, and a desired number of spring members for holding the rod-shaped valve are provided for the mold. The molding apparatus for an inorganic hydraulic molded article according to claim 2, wherein the molding apparatus is provided. 6. The molding apparatus according to claim 1, wherein the through hole is provided on a molding surface of an upper mold, and a release gas injection hole is provided on a molding surface of a lower mold. . 7. The molding apparatus for an inorganic hydraulic molded product according to claim 1, wherein the through hole is provided on a molding surface of a lower mold, and a release gas injection hole is provided on a molding surface of an upper mold. . 8. The drainage gap formed at the tip of the rod-shaped valve with respect to the release gas injection hole has a constant reduced diameter portion whose cross-sectional area is substantially square in plane with respect to the release gas injection hole whose cross-sectional area is substantially circular in plan. The molding apparatus for an inorganic hydraulic molded article according to claim 4, wherein the molding apparatus is formed as follows. 9. The drain valve according to claim 1, wherein the drain valve is moved up and down between a drain position and a water stop position through a hydraulic circuit driven by a cylinder to perform a switching operation. An apparatus for forming an inorganic hydraulic molded article according to any one of the above.