JPH08118339A - Suction pad - Google Patents

Abstract

PURPOSE: To provide a suction pad capable of sucking even a molded object having a biased wall part such as a reinforcing rib without generating deformation or appearance deficiency. CONSTITUTION: A recessed part 23 slightly larger than the protruding part of a molded object and permitting the insertion of the protruding part is formed to the part corresponding to the protruding part of the molded object of a suction surface and vacuum holes 22 with a diameter of 2-10mm are formed to the suction surface excepting the recessed part 23 and the part within 30mm from the end edge of the recessed part at an interval of 20-100mm and the suspension 24 parallel to the end surface of the molded object is extended from the peripheral edge of the suction surface 21 in the length 0.3-5 times the thickness of the molded object.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a suction cup for demolding a press-molded hydraulic inorganic molding.

[0002]

2. Description of the Related Art A molded product obtained by extrusion-molding or press-molding a composition composed of water and a hydraulic inorganic substance such as cement, mortar and gypsum and curing the composition has been used for various structural materials since ancient times. ing. That is, for example, clay roof tiles such as Ibushi roof tiles are well known as roof tiles and have been most often used.

Recently, however, the amount of good quality clay has decreased, and it has become difficult to mass produce good performance clay. Therefore, roof tiles using so-called hydraulic inorganic moldings such as thick slate and cement roof tiles have begun to be produced instead. As a method for producing such a hydraulic inorganic molded body, for example, a method has been proposed in which dehydration molding is performed, and then the upper mold is vacuum-sucked to remove the mold (see Japanese Patent Laid-Open No. 1-215506).

However, in this method, in order to improve the moldability, an excessive amount of water is used with respect to the amount required for hardening the hydraulic inorganic substance, so that the dehydration step requires a long time.
In addition, the molded body obtained by using excess water has a coarse structure and is weak in strength.
Therefore, in order to obtain a molded product such as a roof tile having a sufficient load resistance, the thickness of the molded product, that is, the weight has to be increased, which is disadvantageous in terms of construction and cost. In addition, when the molded product is removed from the mold, since vacuum suction is performed through the filter cloth through the dehydration hole of the upper mold, there is a problem that the fiber or powder material is likely to be clogged during dehydration.

Therefore, for example, a method has been proposed in which a sheet is formed by a paper-making method or an extrusion method and then pressed, and the obtained plate is vacuum-sucked by a suction cup (see Japanese Patent Laid-Open No. 2-8007).

[0006]

However, even in the above method, the flat plate-shaped molded product can be adsorbed and demolded by a suction cup, but in the case of a molded product having an uneven thickness and a complicated shape, Adsorption is difficult. That is, in order to reduce the wall thickness, an uneven thickness portion such as a reinforcing rib is provided, or in the case of a thick molded body, the weight of the molded body becomes large, so that the suction holes due to the weight are eliminated. However, if a large number of vacuum holes are provided, a large number of dents may be formed on the surface of the molded body on the side opposite to the suction surface, resulting in a poor appearance.

Further, a recess corresponding to the protruding portion such as the rib of the suction cup is provided with a protruding portion.
When the recess is made larger than the size of the protrusion so that the protrusion smoothly enters the recess when setting the suction cup,
Since there is a gap between the protrusion and the wall surface of the recess, there is also a problem that the protrusion may lose its shape during adsorption. In view of such circumstances, the present invention provides a suction cup capable of adsorbing a molded body having an uneven thickness portion such as a reinforcing rib without causing the mold to collapse or causing a defective appearance. It is an object.

[0008]

The suction cup according to the present invention comprises:
In order to achieve such an object, a suction cup for adsorbing and demolding a molded body having a protruding portion which becomes thick and is formed on the surface obtained by press molding, wherein the molded body has a suction surface. A recessed portion slightly larger than the projection portion is formed in the portion corresponding to the protrusion portion, and the recessed portion of the suction surface and the suction surface excluding the portion within 30 mm from the recess edge are 2
Vacuum holes with a diameter of 2 mm to 10 mm are formed at intervals of 0 to 100 mm, and the sag along the end face of the molded body is 0.3 to 5 times the thickness of the molded body from the peripheral edge of the suction surface. The structure is extended.

In the above structure, the material of the sagging is not particularly limited as long as it can adhere to the peripheral surface of the compact and maintain a vacuum when the compact is vacuum-adsorbed by the suction cup. If the extension length is too short,
If the molded body does not have a close contact effect and the adsorption performance is poor, and it is too long, it will prevent the molded body from approaching the receiving plate during demolding, and when the molded body is dropped onto the receiving plate, deformation such as distortion will occur in the molded body. Since it is liable to occur, it is 0.3 to 5 times the thickness of the molded body,
More preferably, it is 0.5 to 2 times.

When the diameter of the vacuum hole is less than 2 mm, the deposits on the molded body are apt to be clogged, and when it exceeds 10 mm, no further effect is observed, and the material is sucked into the vacuum hole to form a dent. The diameter is set to 2 to 10 mm, more preferably 3 to 7 mm. It is not necessary to provide the vacuum holes at equal intervals, and if the distance between adjacent vacuum holes is less than 20 mm, no further effect is observed, and if it exceeds 100 mm, the degree of vacuum that can adsorb the compact is obtained. Cannot be obtained, and adsorption failure tends to occur, so 2
It is set to 0 to 100 mm, and more preferably 30 to 60 mm.

Further, if the vacuum hole is provided at a position less than 30 mm from the protruding portion and the peripheral edge of the protruding portion, a gap is created between the protruding portion and the inner wall surface of the concave portion, so that suction is performed. Since a part of the protruding portion is sucked in the strong direction of the protruding portion, and the protruding portion loses its shape, it is provided at a position other than 30 mm from the protruding portion and the periphery of the protruding portion. The curable inorganic composition to be a molded article is not particularly limited as long as it is used for producing a structural material, but is not limited to, hydraulic inorganic materials, fillers, reinforcing fibers, molding aids, water, etc. Those containing are preferred.

The curable inorganic composition can be mixed with a mixer similar to the conventional method and pressed with a press.

[0013]

According to the above construction, the suction cup is arranged above the molded body press-molded by the press machine so that the projection of the molded body faces the concave portion of the suction cup, and the suction surface is brought into close contact with the surface of the molded body.
At this time, since the concave portion is slightly larger than the projecting portion, the projecting portion does not lose its shape, and the suction surface adheres to the surface of the molded body.

Then, the molded body is sucked through the vacuum hole to be sucked by the suction cup. At this time, since the sagging is in close contact with the side peripheral surface of the molded body, a sufficient suction force can be obtained even with a small suction force, and the molded body is sucked by the suction cup. Moreover, since no vacuum hole is provided in the portion of the protruding portion and at a position less than 30 mm from the periphery of the protruding portion, a large vacuum force does not act on the protruding portion, and the protruding portion does not lose its shape.

Next, by moving the suction cup above the receiving plate or the like and releasing the suction, the molded body can be placed on the placing portion such as the receiving plate.

[0016]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described in detail below with reference to the drawings showing the embodiments thereof. (Example 1) 100 parts by weight of ordinary Portland cement (manufactured by Onoda Cement Co., Ltd.), fly ash (JIS A
6201 equivalent product, true specific gravity 2.3, bulk specific gravity 0.6: manufactured by KANDENKA CORPORATION 40 parts by weight, vinylon fiber (fiber diameter 15 μm,
2 parts by weight of fiber length 3 mm, hydroxypropylmethyl cellulose (viscosity of 2% aqueous solution at 20 ° C. is 30,000
2 parts by weight of cps) in an Erich mixer (manufactured by Erich) having a volume of 70 liters for 3 minutes, and 30 parts by weight of water is added to the resulting mixture, and further 2
The mixture was mixed for a minute to obtain a hydraulic inorganic composition.

The obtained hydraulic inorganic composition was kneaded with a clay kneader (MP-100 type manufactured by Miyazaki Iron Works Co., Ltd.), and then a screw diameter 100 mm in which a die having a parallel portion of 100 mm in an extrusion groove was installed. Vacuum Extruder (MV-Miyazaki Iron Works Co., Ltd.
Extrusion molding with FM-A-1 type), width 200mm x 300m
A molded body with m and a thickness of 10 mm was obtained. The obtained molded body was supplied to a press molding machine (Yamamoto Iron Works, KA-250 type),
Press-molded at a pressure of 70 kg / cm ² for 5 seconds, the corrugated shape having ribs 11 and 11 having a width of 10 mm and a height of 10 mm as shown in FIG. 3 has a thickness of 6 mm, L1 dimension is 330 mm, and L2 dimension is 28 mm.
A molded product 1 having a size of 0 mm and an L3 size of 160 mm was obtained.

Then, after removing the upper mold, as shown in FIG. 1, a suction cup 2 is arranged above the molded body 1 remaining on the lower mold 3 so that the molded body 1 is sucked by the suction cup 2 and After demolding from the mold 3, the mold 3 was carried to a receiving plate (not shown), the suction was released, and the molded body 1 was placed on the receiving plate. Then, the suction performance at this time, the depression of the molded body 1 after being placed on the receiving plate, and the deformation of the molded body when the molded body was placed on the receiving plate were observed. The evaluation results are shown in Table 1.

The suction cup 2 used has, as shown in FIG. 2, two vacuum holes 22 ...
135 pieces are provided at a pitch of 0 mm, and recesses 23, 23 are provided in portions corresponding to the ribs 11, 11. In addition, the vacuum holes 22 are not provided at all in the recesses 23 and 23 and the position less than 30 mm from the recesses 23, and the vacuum holes 22 are hung down from the peripheral edge of the suction surface 21.
Has a length that is one time the thickness of the molded body, that is, 6 mm and extends toward the molded body.

(Examples 2 to 8 and Comparative Examples 1 to 8) Equipped with the intervals, numbers, diameters, vacuum holes 22 of the shortest distance from the ribs, and the sag 24 of the extended length as shown in Tables 1 and 2. Sucker 2
The adsorption performance, the depression of the molded body 1 after being placed on the receiving plate, and the deformation of the molded body when the molded body was placed on the receiving plate were observed in the same manner as in Example 1 except that the above was used. The evaluation results are shown in Table 1 and Table 2.
Are also shown.

The evaluation method is as follows. (1) Adsorption performance to the suction cup at the time of demolding After the press molding, the molded article adsorbed to the suction cup was rated as ◯, and the one dropped was rated as x. (2) Observation of dents in molded body After aging the molded body 1 placed on the receiving plate at 60 ° C and 90% RH for 6 hours, the dents on the surface opposite to the suction surface were visually observed. If the dent did not occur,
The generated one was marked with x. (3) Observation of deformation when the molded body was placed on the receiving plate: When the molded body was not deformed when placed on the receiving plate, it was marked with ◯, and when it was deformed, it was marked with x.

[0022]

[Table 1]

[0023]

[Table 2]

From Tables 1 and 2, according to the suction cup of the present invention, even when the molded body having an uneven thickness is released from the mold, the molded body is sucked and conveyed to the receiving plate without deforming the molded body. I see that I can do it. The suction cup according to the present invention is not limited to the above embodiment. For example, in the above-mentioned embodiments, the molded body has a corrugated shape, but it may have a flat plate shape. Further, in the above-mentioned embodiment, the ribs are provided in parallel, but they may be provided so as to intersect with each other, or they may be provided intermittently.

[0025]

EFFECTS OF THE INVENTION Since the suction cup according to the present invention is configured as described above, even a molded body having an uneven thickness such as ribs can be manufactured without providing many vacuum holes around the uneven thickness portion. Can be surely adsorbed and demolded. As a result, the defect rate of demolding is reduced, and furthermore, the back surface of the uneven thickness portion is prevented from being dented due to the suction of the vacuum holes, and a product having an excellent appearance can be obtained.

[Brief description of drawings]

FIG. 1 is an explanatory view showing an embodiment of a suction cup according to the present invention and showing a state of being arranged on a molded body thereof.

FIG. 2 is a perspective view of the suction cup of FIG. 1 viewed from the suction surface side.

FIG. 3 is a perspective view of a molded body that is sucked by the suction cup of FIG.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Molded body 2 Sucker 11 Rib (projection part) 21 Adsorption surface 22 Vacuum hole 23 Recess 24

Claims (1)

[Claims] 1. A suction cup for adsorbing and demolding a molded body having a thickened protruding portion formed on the surface obtained by press molding, the suction cup corresponding to the protruding portion of the molded body on the suction surface. A recessed portion slightly larger than the protruding portion and into which the protruding portion is inserted is formed, and the recessed portion of the suction surface and the recessed edge 30
Vacuum holes with a diameter of 2 mm to 10 mm are formed at intervals of 20 to 100 mm on the suction surface excluding the portion within mm, and the sag along the end face of the molded body is 0 from the peripheral edge of the suction surface to the thickness of the molded body. A suction cup that is extended at a length of 3 to 5 times.