JP3724598B2 - Manufacturing method of outer tank for sewage septic tank - Google Patents

Description

[0001]
[Industrial application fields]
The present invention relates to a method for producing a fouling water septic tank for outer tub.
[0002]
[Prior art]
Conventionally, a sewage treatment septic tank has been mechanically molded by a sheet mold compound (hereinafter referred to as SMC). This is a method of molding by pressing SMC, and the working efficiency is improved as compared with manual hand lay-up molding.
[0003]
In press molding, a plurality of molding dies are used due to the difference in shape between the upper and lower tanks, and the upper and lower tanks are molded by the respective molding dies and connected after molding.
[0004]
[Problems to be solved by the invention]
However, it is generally known that when the outer tank of the sewage purification tank, that is, the upper tank and the lower tank is molded by SMC, the strength is reduced at the joining point of the molding material.
[0005]
Therefore, when providing an opening for the inspection port in the upper tank, when the molding is performed by pressing, the opening is formed by manual work with a tool after pressing or by an automatic machine or the like for the purpose of preventing the strength from being reduced due to merging of molding materials at the opening. Yes. In addition, the upper tank and lower tank of the septic tank are generally fastened with bolts with a sealing material sandwiched between the joint surfaces. Is difficult to obtain by SMC molding. Therefore, the bolt holes for fastening the upper tank and the lower tank are also formed manually by a tool or an automatic machine after pressing.
[0006]
In addition, in the SMC press molding method, it is difficult to produce a molded product having a complicated shape due to the flowability problem of the SMC in addition to the decrease in strength at the joining point of the molding material, and there are openings, screw holes, etc. SMC press molding of the septic tank is not performed.
[0007]
In addition, a part of the outer tub generated when providing openings and bolt holes is often landfilled as waste material, which is not a favorable situation from the viewpoint of environmental protection, and uses a plurality of molds. This also increases the cost.
[0008]
In view of the above problems, without strength decreases even at the confluence of the molding material, reducing the number of steps of the septic tank fabrication, is a mold manufacturing method of multiple use and such have dirty water septic tank for outer tub .
[0009]
[Means for Solving the Problems]
The sewage septic tank manufactured by the manufacturing method of the present invention is connected to an upper tank and a lower tank having, for example, an inflow pipe and a discharge pipe, and the interior is partitioned by a partition surface, and a sedimentation separation chamber or an anaerobic treatment chamber, an aerobic treatment chamber. In the sewage purification tank formed with a hopper-shaped sedimentation chamber and a disinfection chamber, the upper tank and the lower tank are made of dicyclopentadiene cross-linked polymer and formed in the same shape, and the lower tank hopper-shaped sedimentation chamber is the upper tank connects the upper tank and the lower tank as the inlet tube mounting surface, and only set the inspection opening in the upper tank top in.
[0010]
Moreover, the manufacturing method of the outer tank for sewage purification tanks of this invention changes the part of the same shaping | molding die by replacing | exchanging nesting, the upper tank which has the opening part for inspection openings, and the lower tank which does not have the said opening part Is manufactured by RIM molding using a dicyclopentadiene cross-linked polymer, and the mold is capable of forming bolt fastening holes on the joint surfaces of the upper and lower tanks. Also features.
[0011]
The dicyclopentadiene cross-linked polymer here is a polymer obtained by polymerizing dicyclopentadiene, which is a kind of norbornene-based monomer, using a metathesis catalyst system.
[0012]
The mold is divided into a male mold and a female mold, and the material is not particularly limited. However, in order to avoid the influence of thermal expansion as much as possible, it is preferable that the material of the insert and the mold is the same.
The nest can be attached and detached when switching between the molding of the upper tank and the lower tank, and is preferably made of the same material as the mold. This is to eliminate the influence of thermal expansion. Specifically, aluminum that is easy to process and lightweight is preferable.
[0013]
[Action]
Since the septic tank according to the present invention uses a dicyclopentadiene crosslinked polymer as a molding material, the strength does not decrease at the junction. This is because the flowability of the dicyclopentadiene crosslinked polymer is larger than that of SMC, and the material flows uniformly throughout the mold.
Furthermore, it became possible to manufacture the outer tank for sewage septic tanks provided with openings and bolt holes for the above reasons.
[0014]
【Example】
Hereinafter, it demonstrates along drawing.
FIG. 1 shows the appearance of the septic tank according to the present invention. An upper tank 1 having an inflow pipe 6 and a discharge pipe 10 and a lower tank 2 are connected, and the inside is partitioned by a partition plate to form a sewage purification tank. The upper tank 1 and the lower tank 2 are different from each other in the presence or absence of the opening 3 except for the inflow pipe 6 and the discharge pipe 10 which are retrofitted, and are manufactured from the same mold. The upper tank 1 and the lower tank 2 are joined such that the hopper-shaped portion 4 of the lower tank 2 becomes an attachment portion of the discharge pipe 10 in the upper tank 1. In other words, the lower tank 2 corresponding to the hopper portion 6 of the upper tank 1 is connected so as to be a precipitation separation chamber or an anaerobic treatment chamber 7 which is not in a hopper shape.
[0015]
The upper tank and the lower tank are connected by fastening a sealing material into the flange portion provided in the upper and lower tanks with a bolt. As the sealing material, those generally used in septic tanks can be used as appropriate, but a urethane-based sealing material is more preferable.
[0016]
Next, the mold for producing the sewage septic tank of the present invention will be described with reference to FIGS. 3 and 4. The mold is composed of a female mold 12 and a male mold 13. Both the upper tank and the lower tank are manufactured from the same female mold 12 and male mold 13, but when the upper tank is formed, a part of the molding mold formed with the lower tank is opened by attaching and detaching the insert 11. Can be molded. The nest can be attached to both the male mold and the female mold, but it is more preferable that the nest is attached to the male mold that molds the inner surface of the sewage purification tank.
[0017]
The outer tank of the septic tank is formed by inserting a material into a gap formed in a state where the female mold 12 and the male mold 13 are completely closed. More specifically, when the lower tank 2 is formed, the material is inserted into a space where a predetermined width is formed on all opposing surfaces in a state where the female mold 12 and the male mold 13 are completely closed. To do. On the other hand, when the upper tub 1 is formed, in the state where the female mold 12 and the male mold 13 are completely closed, only the portion where the insert 11 is attached is configured so that no gap exists, and the portion where the gap does not exist is formed. The material insertion was blocked to form an opening. Furthermore, if packing is attached to the insert 11, the interruption | blocking of material insertion can be improved.
[0018]
In the present invention, since dicyclopentadiene RIM molding is used, it is possible to mold bolt fastening holes that are impossible in SMC press molding. The hole for passing the bolt for connecting the upper tank 1 and the lower tank 2 is achieved by providing a pin 14 in the flange forming portion of the male mold 13 to block material insertion as shown in FIG. Needless to say, providing the pins 14 is not limited to the male mold 13, and there is no problem even if the pins 14 are provided on the female mold 12. However, in the sewage septic tank of the present invention, it is reversed when connecting the upper tub 1 and the lower tub 2, so that the place where the pin is provided is vertically and horizontally symmetrical (as viewed from the flange surface). is there.
[0019]
【The invention's effect】
As described above, the present invention has the following effects.
1. Since the upper tank and lower tank of the septic tank are made by the same mold, the cost can be reduced.
2. There is no need to process the opening of the upper tank and the bolt hole for fastening, the assembling work can be improved, and there is no environmental pollution due to waste materials.
3. Since the dicyclopentadiene crosslinked polymer is used, the strength does not decrease at the joining point of the molding material.
[Brief description of the drawings]
FIG. 1 is a perspective view of a sewage septic tank according to the present invention.
FIG. 2 is a partial cross-sectional view of a sewage septic tank according to the present invention.
FIG. 3 is a partial bottom view of a mold according to the present invention.
FIG. 4 is a side view of a mold according to the present invention.
[Explanation of symbols]
1. Upper tank 2. Lower tank 3. Opening 4. 4. Hopper-shaped part 5. Hopper shape part Inflow pipe 7. Anaerobic treatment room 8. Water surface 9. Inflow water10. Discharge pipe 11. Nesting 12. Female mold 13. Male 14 pin

Claims (2)

The upper tank and the lower tank of the septic tank A method of manufacturing the same mold, a portion of the upper tank the mold during molding is changed by exchanging the nesting fitted with a packing, the access door opening The manufacturing method of the outer tank for sewage septic tanks which the upper tank which had was manufactured by RIM shaping | molding using the dicyclopentadiene crosslinked polymer.   The manufacturing method of the outer tank for sewage septic tanks of Claim 1 with which a shaping | molding die can shape | mold the hole for bolt fastening in the joining surface of an upper tank and a lower tank.

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