JPH0781300B2 - Manufacturing method of synthetic resin drainage basin - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for manufacturing a synthetic resin drainage basin installed at the confluence of sewers or the like.

[0002]

2. Description of the Related Art Conventionally, for example, as shown in FIG.
From the side of the box, the receiving part (3) with the packing groove (3) A and the insertion part
(4), and the inspection tube connection part (5) from the top,
The synthetic resin drainage basin (1) with the legs (6) protruding from the bottom was manufactured by an injection molding method.

Injection mold used in the above injection molding method
(7) is, for example, as shown in FIG. 5, an outer mold (8 , 9) and an inner mold (10,
11,12,13,14) . That is, when a molded product having an undercut portion such as the drainage basin (1) is injected, a large number of divided inner molds must be used.

[0004]

As described above, in the conventional injection molding method, a large number of divided inner molds have to be used to manufacture the drainage basin, which complicates the mold structure. Therefore, the cost of the mold is high and the cost is increased, and in the case of the drainage basin having a large diameter, the size of the mold is large, which causes various problems in molding. Further, there is a problem that a step is formed on the inner surface of the drainage basin at the boundary between the divided inner molds, and dust or mud is caught on the step.

[0005]

As a means for solving the above-mentioned conventional problems, the present invention extends the pipe connecting portions (13, 14) from the side surface of the main body (12), and the inspection tube connecting portion (15) from the upper surface. the held out, upon manufacturing a catch basin which held out legs (16) (11) from the bottom, a tube connecting portion body (12) (13, 14) and the thermoplastic plastics of
The stick is integrally molded by differential pressure molding, the inspection cylinder connection part (15) and the leg part (16) are brought into contact with the differential pressure molded product, and the glass fiber reinforced plastic layer (17) is attached to the outer surface of the main body (12). ) And the glass fiber reinforced plastic layer (1
Depending on 7) body (12) and inspection tube connection (15) and legs (16)
The present invention provides a method for manufacturing a synthetic resin drainage basin (11) for joining and.

[0006]

According to the present invention, the difference molding moiety, i.e. a body (12), the pipe connection portion being Sashidesa from the side surface of the body (12) and (13, 14) as the material of the thermoplastic Differential pressure molding is performed integrally. Since differential pressure molding does not use an inner mold, no step is formed on the inner surface of the molded product and the surface is smooth, and the structure is simple and large molded products can be molded easily. The inspection tube connection part (15) and the leg part (16) that cannot be formed by differential pressure molding are separately manufactured by injection molding, and the surface of the drainage basin (11) main body (12) is covered with a glass fiber reinforced plastic layer. (FRP layer (17))
When it is reinforced with, it is joined by the FRP layer (17).

The differential pressure molding method in the present invention is a method of molding by providing a pressure difference between the inner side and the outer side of the molded article, and a blow molding method in which a higher pressure is exerted on the inner side of the molded article than on the outer side, There are a reduced pressure molding method in which the pressure is reduced from the inside, and a blow reduced pressure molding method in which both are used in combination.

[0008]

EXAMPLES The present invention will be described with reference to an example shown in FIGS. 1 to 4. (20) is a blow molding die, and the main body (12) of the drainage basin (11) and the main body (12) are Receptacle part (1
A molding part (21) having an inner shape corresponding to the outer shape of the blow-molded body in which 3) and the insertion opening part (14) are integrated is formed inside.

As shown in FIG. 1, a large-diameter pipe (10) made of a heat-softened thermoplastic is inserted into the molding portion (21) of the blow mold (20), and both ends of the pipe (10) are inserted into the pipe (10). The plugs (22, 23) are inserted, and the compressed air introducing pipe (24) is connected to one plug (23). When pressure air is blown into the pipe (10) in the heat-softened state from the pressure air introduction pipe (24) to exert a pressure inside the pipe (10), as shown in FIG. 2, the main body (12) and the main body ( A blow-molded body (10A) in which the receiving portion (13) and the insertion portion (14) that are pulled out from the side surface of 12) are integrated is molded. In the blow molded body (10A) , a packing groove (13A) is formed in the receiving port ( 13), and a connection port (15A ) for connecting the inspection tube connecting part (15) to the upper surface of the main body (12). ) Is formed.

The blow molding body (10A) is a blow molding die.
As shown in FIG. 3, the connection port (15A) is taken out from the (20), the connection port (15A) is opened by cutting, and the chamfered part (14A) is provided by cutting at the end edge of the insertion port (14). And the connection port of the main body (12)
Contact the inspection tube connection part (15) with (15A), and attach the annular leg (1
6) is abutted and the FRP layer (17) is formed on the outer surface of the main body (12) by the hand-up method to reinforce and the inspection tube connecting portion (15) and the annular leg portion (16) are connected to the main body ( Join to 12).

In this way, the drainage basin as shown in FIG.
(11) is manufactured, but in the drainage basin (11) the main body (12)
Since the inlet part (13) and the receiving part (13) are integrally blow-molded, an inner mold or the like is not used, and a smooth drainage basin (11) having no step on the inner surface can be obtained. Then, an FRP that joins the blow-molded body (10A) to the inspection tube connection part (15) and the annular leg part (16).
At the same time, the layer (17) reinforces the main body (12), and the inspection tube connection (1
Be sufficiently resistant to the pressure exerted on the body (12) from above via (5).

Other than this embodiment, the connection port (15A) of the main body (12 )
The inspection tube connecting portion (15) may be adhesively joined to the main body (12), and the leg portion (16) may be adhesively joined to the main body (12).
The RP layer (17) may be laminated. In use, a ring-shaped packing (18) is installed in the packing groove (13A) of the receiving portion (13) of the drainage basin (11).

[0013]

According to the present invention, therefore, a drainage basin having a smooth inner surface and free from catching mud, dust, etc. can be produced with a simple mold, and a large one can also be easily produced. Furthermore, the main body is reinforced by the FRP layer,
A product having high strength and excellent durability and reliability can be obtained.

BRIEF DESCRIPTION OF THE DRAWINGS FIGS. 1 to 4 show an embodiment of the present invention.

FIG. 1 is an explanatory view of a state before blow molding

FIG. 2 is an explanatory view of a state after blow molding.

FIG. 3 is an explanatory view of a state before stacking FRP layers.

[Figure 4] Perspective view of the product

FIG. 5 is an explanatory view of a conventional injection molding state.

[Explanation of symbols]

 11 Drainage basin 12 Main body 13 Receiving part 14 Inserting part 15 Inspection tube connecting part 16 Annular leg 17 FRP layer 20 Blow molding die

Claims (1)

[Claims] 1. When manufacturing a drainage basin in which a pipe connecting portion is inserted from a side surface of a main body, an inspection tube connecting portion is inserted from an upper surface and a leg portion is inserted from a bottom surface, the main body and the pipe connecting portion are made of a thermoplastic plus resin.
Integrally molded by tic using tic as a material , the inspection cylinder connection part and the leg part are brought into contact with the differential pressure molded product, and a glass fiber reinforced plastic layer is laminated on the outer surface of the main body part,
A method for manufacturing a synthetic resin drainage basin, characterized in that the main body is joined to the inspection tube connecting portion and the leg portion by the glass fiber reinforced plastic layer.