JP2009034587A - Method for manufacturing cylindrical treatment tank - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a method for manufacturing a cylindrical treatment tank, in which a main body of the cylindrical treatment tank such as a cylindrical combined septic tank and a cylindrical disposer garbage waste water treatment tank can be molded by simplifying a manufacturing process thereof without using a plurality of forming dies and the thickness of the main body can be changed according to the installation condition of the cylindrical treatment tank. <P>SOLUTION: The method for manufacturing the cylindrical treatment tank by separately forming an upper part and a lower part of the cylindrical treatment tank consisting of a glass fiber-reinforced plastic comprises the steps of: forming the lower part by using a common die for forming portions common to the upper part and the lower part as one of forming dies; forming the upper part by using a common die-fit auxiliary forming die having a shape part for forming an inspection hole to be arranged only on the upper part; and arranging a flange part at each of the formed upper part and the formed lower part and joining the flange part of the formed upper part to that of the formed lower part. As a result, the manufacturing process thereof can be simplified, the manufacturing cost can be reduced and the precision thereof as a product can be improved. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a method for manufacturing a cylindrical processing tank. More specifically, the present invention relates to a cylindrical treatment tank such as a cylindrical merged treatment septic tank and a cylindrical disposer garbage wastewater treatment tank.

  As a general method for manufacturing a processing tank, a method of press molding by filling a sheet mold compound (SMC) into a press die, and a mechanical spraying method of a resin material (hereinafter referred to as “spray-up molding method”) Or there exists the method of apply | coating and laminating | stacking by the hand-loading method (henceforth "the hand-up formation method"). The former press molding method can be manufactured in a short time, but uses an expensive molding die and hydraulic press equipment, and is therefore suitable for mass production of small processing tanks having a total length of less than about 4 m. On the other hand, the latter coating and laminating method requires a long time for manufacturing, but uses a mold and manufacturing equipment that are less expensive than the former, so that the total length is approximately 4 m or more, and a large variety of small-scale processing tanks are available. Suitable for production.

  The processing tank is provided with a plurality of inspection ports, inlets, outlets, and the like in the upper tank, whereas the lower tank is not provided with these, and therefore the shapes of the upper tank and the lower tank are different. Therefore, the conventional manufacturing method requires a mold dedicated to the upper tank and a mold dedicated to the lower tank. And the opening part for shape | molding an inspection port is provided in the upper tank, and the opening part is processed after shaping | molding. Furthermore, the waste material generated when the opening is provided is not preferable from the viewpoint of environmental protection. In addition, the above method has a problem in terms of manufacturing cost, such as having to use a plurality of molds.

  As an example, after forming the upper tank and the lower tank in a common mold, a method is proposed in which a plurality of inspection port members provided only in the upper tank are formed in another mold and later joined to the upper tank. (See Patent Document 1). However, there are drawbacks in that it takes time to join the overlapping portions, and variations in strength are likely to occur.

  In addition, a processing tank manufacturing method is also known in which a common mold and its auxiliary mold can be used to form an inspection port in the lower tank and the upper tank of the processing tank (see Patent Document 2). However, this is an invention describing a method of manufacturing a square merged treatment septic tank.

  The shape of the treatment tank includes a round shape in addition to the square shape that is the invention described in Patent Documents 1 and 2 above. The round processing tank has a shape with good dispersion of strength when buried in the shape. The treatment tank is usually made of glass fiber reinforced plastic (Fiber Reinforced Plastic, hereinafter referred to as “FRP”). Therefore, the thickness of the FRP of the round processing tank is 8.0 mm to 9.0 mm. On the other hand, the thickness of the FRP in the square treatment tank usually needs about 10 to 12 mm. Accordingly, the round processing tank can reduce the thickness of the FRP by 20% or more compared to the square processing tank. As a result, the manufacturing cost can be reduced. However, the present situation is that there are few suppliers for a round processing tank because manufacturing equipment is more expensive than a square processing tank.

Hereinafter, the conventional manufacturing method of a round processing tank is demonstrated using FIG. 6, FIG.
FIG. 6 is a view showing an apparatus used in a conventional method for forming the FRP main body 901. First, iron is usually used as the material of the mold 801 used here. The mold 801 has a split mold structure so that it can be easily taken out (demolded) after molding the FRP. Further, a release agent such as wax is applied to the inside of the mold 801 so that the FRP can be easily peeled off.

  The mold 801 is rotated by a rotating roller 803 driven by a motor 802. Inside the mold 801, a polyester resin 812 is supplied to the SUS pipe 804 by a hose such as vinyl chloride having excellent pressure resistance and solvent resistance. The supplied polyester resin 812 is sprayed into the mold from a plurality of holes 807 attached to the SUS pipe 804. And the glass fiber cut by 25-50 mm by the chopper apparatus 805 is spread | dispersed on the polyester resin by which predetermined amount was spread | dispersed.

  The chopper device 805 that cuts the glass fiber includes a rubber roll 809, a roll 808 with blades attached thereto, and a pressing roll that presses the roving yarn that is bundled with the glass fiber and wound in a roll shape so as not to come out of the chopper device. 810. The rubber roll 809 is driven electrically. The glass fiber is cut by being pressed against a roll 808 and a rubber roll 809 to which blades are attached. At this time, the amount of glass fiber to be spread is set by the number of rotations of the mold 801 and the amount of polyester resin supplied in advance, and is usually adjusted so that the glass fiber content is about 30% by weight.

  A defoaming roll 806 is installed inside the mold 801. For example, the defoaming roll 806 is formed by winding a resin mesh belt or a SUS mesh belt having a solvent resistance such as vinyl chloride resin, polypropylene (PP) resin, polyester (PE) resin around a metal such as an aluminum cylinder. It has a configuration. The defoaming roll 806 rotates in conjunction with the mold 801. Due to the self-weight of the defoaming roll 806 and the effect of the wound mesh belt, the glass fiber and the polyester resin are forcibly impregnated, and the enclosed air bubbles are pushed out. When the weight of the defoaming roll 806 is insufficient, air pressure is applied. The resin supply SUS pipe 804, the defoaming roll 806, and the chopper device 805 are configured to reciprocate inside the mold.

  With the above configuration, the polyester resin and the glass fiber can be repeatedly sprayed until a predetermined thickness is reached. Further, impregnation and defoaming can be repeated in order to make the surface of the laminated resin layer as smooth as possible. Even after the predetermined amount is laminated, defoaming / impregnation can be further performed by rotating the defoaming roll 806 together with the mold 801 until the polyester resin is gelled.

  After the resin is cured, the bolt 813 that joins the mold 801 is loosened, and the FRP molded product 901 (hereinafter sometimes referred to as “FRP main body”) is taken out from the inside. The FRP main body 901 taken out is cut to a predetermined length, and a portion to which the inspection port is attached is cut out. Thereafter, an inspection port, a partition plate, a reinforcing plate, a mirror portion, and the like are attached to the FRP main body 901.

  Hereinafter, referring to FIG. 7, the inspection port 905, the partition plate 902, the reinforcing plate 903, and the curved mirror portions 909 at the left and right ends in the longitudinal direction of the upper tank or the lower tank are attached to the FRP molded product 901 obtained in FIG. The process will be described. In the following description, the curved mirror parts at the left and right ends in the longitudinal direction of the upper tank or the lower tank may be abbreviated as mirror parts.

  FIG. 7A is a diagram illustrating a process of attaching the inspection port 905 after the FRP main body 901 is formed. The inspection port 905 is formed as follows. First, a mold made of iron or FRP is prepared separately from the mold for the FRP main body, and a polyester resin and glass fiber are laminated thereon, followed by curing. After curing, the inspection port 905 is formed by demolding and trimming. The inspection port 905 thus obtained is installed at a predetermined position of the FRP main body 901. Further, the inspection port 905 is secondarily bonded to the predetermined installation position of the FRP main body by FRP, and the installation of the inspection port 905 is completed.

At this time, the bonding portion between the FRP main body 901 and the inspection port 905 is shaved with a grinder to reveal the surface. By raising the surface, the wax added for curing the polyester resin and precipitated on the FRP surface can be scraped off, and the adhesion effect is improved. This bonded portion is formed by laminating and curing 3 to 5 glass fabric mats (450 g / m ² ) together with a polyester resin.

  FIG. 7B is a diagram illustrating a process of inserting the partition plate 902 and the reinforcing plate 903 into the FRP main body 901. For the partition plate 902 and the reinforcing plate 903, an iron or FRP mold is prepared separately from the mold for the FRP main body, and polyester resin and glass fiber are laminated and cured. After curing, the mold is removed and trimmed to complete the partition plate 902 and the reinforcing plate 903. Thereafter, the partition plate 902 and the reinforcing plate 903 are inserted into predetermined positions of the FRP main body 901. At this time, the partition plate 902 and the reinforcing plate 903 are sequentially inserted from the center of the main body. Further, the partition plate 902 and the reinforcing plate 903 are secondarily bonded by FRP at a predetermined installation position of the FRP main body in the same manner as the second bonding of the inspection port 905, and are joined to the main body by bolts as necessary. The

FIG. 7C is a diagram showing a process of attaching the mirror part of the processing tank. The mirror part 909 of the treatment tank prepares a mold made of iron or FRP separately from the mold for the FRP main body 901, and laminates and cures polyester resin and glass fiber. After curing, the mirror part 909 is completed by demolding and trimming. The obtained mirror part 909 is set on both left and right ends of the FRP main body 901. Thereafter, secondary bonding is performed in the same manner as the inspection port 905, the partition plate 902, and the reinforcing plate 903. In the secondary bonding, 450 basis weights (450 g / m ² ) made of glass fiber are laminated together with 6 to 8 polyester resins and cured to be adhesively reinforced.

FIG. 7D is a diagram showing a cylindrical processing tank 910 obtained by the above-described process. Since the cylindrical treatment tank 910 has a round bottom surface, legs are necessary to stably place it on a concrete plate. Further, feet are set in the cylindrical processing tank 910 of FIG. 9D, and a portion to be secondarily bonded is cut off with a grinder similarly to the inspection port 905, the partition plate 902, the reinforcing plate 903, and the mirror portion 909. In this portion, about 3 to 6 glass fiber mats (450 g / m ² ) are laminated together with a polyester resin and cured, and adhesion reinforcement is performed. The cylindrical processing tank is completed through the above steps.

Japanese Patent Laid-Open No. 9-1169 JP-A-11-333479

  Although the conventional method for manufacturing a cylindrical treatment tank has been described with reference to FIGS. 8 and 9, the conventional method described above has the following drawbacks.

  That is, in the conventional method described above, the inspection port cannot be molded simultaneously with the main body. Separately, polyester resin and glass fiber are laminated and cured on a mold made of iron or FRP by spray-up molding method or hand lay-up molding method, then demolded and trimmed to make FRP parts and bonded to the body I must. In addition, the process is complicated, for example, the mirror part must be formed separately from the FRP body and then bonded to the body. Further, when attaching the partition plate and the reinforcing plate to the main body, it is necessary to attach the partition plate and the reinforcing plate sequentially from the center of the FRP main body toward both ends after the FRP main body is formed. In addition, the accuracy of the inner diameter of the main body causes difficulty in entering the partition plate and the reinforcing plate. Furthermore, it is necessary to grind the inspection port with a grinder, which is problematic in terms of environmental conservation.

  Since the cylindrical treatment tank is more pressure-applied to the lower tank than the upper tank after being landfilled, it is more reasonable to adjust the thickness of the tank between the upper tank and the lower tank. However, since the cylindrical processing tank shape | molded by the conventional method cannot change the thickness of FRP according to a pressure, the thickness of a tank cannot be adjusted. Furthermore, it is very difficult to attach a mirror part molded separately from the main body in a stable state. In addition, since concentrated stress is applied to the bonded portion between the FRP main body and the mirror portion after landfill, there is a problem that the mirror portion is peeled off when the bonding is insufficient.

  In addition, although a large number of glass fibers are supplied and cut, there is a problem that an FRP main body having a uniform thickness and a uniform strength cannot be molded when a trouble occurs in which some of the glass fibers fall out.

  The present invention has been made in view of the above circumstances, and can reduce the manufacturing process of the cylindrical treatment tank, can mold the FRP main body without using a plurality of molds, and the thickness of the FRP main body according to the installation conditions. The present invention provides a method for manufacturing a cylindrical treatment tank that can be formed into a thickness.

  In order to solve the above problems, the invention according to claim 1 is a method for manufacturing a cylindrical processing tank in which an upper tank and a lower tank of a processing tank made of glass fiber reinforced plastic are separately molded, and as a mold, A common mold for forming a common part in the upper and lower tanks, and a common auxiliary mold having a step for forming the lower tank and a shape part for forming an inspection port provided only in the upper tank. A cylindrical processing tank comprising: a step of forming an upper tank by attaching to a mold; and a step of providing flange portions in each of the upper tank and the lower tank and joining the flange portions. A manufacturing method is provided. The above-mentioned glass fiber reinforced plastic is obtained by blending glass fiber as a reinforcing fiber and auxiliary materials into a polyester resin as a main component. Hereinafter, the glass fiber reinforced plastic is referred to as “FRP”.

  Here, the common mold is a mold formed of iron, FRP or the like that can be used for both the upper tank and the lower tank. The auxiliary mold is a mold in which a mold for an inspection port to be an inspection port later is temporarily installed in the common mold. According to this auxiliary molding die, the number and size of the inspection ports can be arbitrarily changed. The shape of the inspection port can be formed into a round shape or a square shape as required. The common type of the lower tank can be used for the upper tank and can be used repeatedly. Further, since the common mold and the auxiliary mold each have a flange forming portion, the flange portion can be integrally formed in each of the upper tank and the lower tank.

  The invention according to claim 2 limits the common part of the upper tank and the lower tank of the invention according to claim 1. This common part is a mold formed by a common mold, and the lower tank includes curved mirror parts and flange parts on both the left and right sides in the longitudinal direction, and the upper tank is curved on both the left and right sides in the longitudinal direction. The mirror part and the flange part which were made are included. These common parts mean molds that can be molded with a common mold.

  The invention according to claim 3 limits the thickness of the FRP. Since the same mold is used for both the upper tank and the lower tank, the height is the same. As for the thickness of FRP, the maximum load applied to the lower tank is double that of the upper tank, but considering various factors, the lower tank is 7 mm to 10 mm, and the upper tank is the same thickness as the lower tank or up to about 4 mm than the lower tank. Mold thin.

  When the treatment tank is landfilled, pressure is applied to the lower tank compared to the upper tank. Therefore, it is more reasonable to adjust the thickness of the upper and lower tanks.

  The invention according to claim 4 limits the common type. According to this common type, the lower tank of the processing tank and the curved mirror portions at the left and right ends in the longitudinal direction of the lower tank can be integrally formed.

  The invention according to claim 5 limits the auxiliary mold. According to this auxiliary molding die, the upper tank of the processing tank, the inspection port provided only in the upper tank, and the curved mirror parts at the left and right ends in the longitudinal direction of the upper tank can be integrally formed.

  According to the present invention, it is possible to form not only the lower tank but also the inspection port provided only in the upper tank by using the common mold and the auxiliary mold in the manufacturing process of the cylindrical treatment tank. Therefore, it is not necessary to prepare a mold separately from the processing tank main body and form the inspection port, or to retrofit the inspection port after the processing tank main body is completed. Further, it is possible to reduce the manufacturing cost including the mold manufacturing cost and the space for holding the mold, and to improve the product accuracy.

  Examples of embodiments of the present invention (hereinafter referred to as “present examples”) will be described below, but the present invention is not limited to the following examples.

<Embodiment>
This example will be described with reference to FIGS. FIG. 1 is a diagram illustrating a manufacturing process of an upper tank of the processing tank of this example, and FIG. 2 is a diagram illustrating a manufacturing process of a lower tank of the processing tank of this example. Moreover, FIG. 3 is a figure explaining the main body of the cylindrical processing tank obtained by the process of FIG. 1, FIG.

  First, with reference to FIG. 1, a molding process of a main body (hereinafter, abbreviated as FRP main body) composed of FRP in the upper tank will be described. FIG. 1A is a diagram showing that the inspection port mold 105 is temporarily installed at a predetermined position where the inspection port on the common mold 101 is attached. The temporary position of the inspection port 105, the number of inspection ports, and the size can be changed according to specifications. Further, the common mold 101 is provided with a flange portion 102 to be a flange portion later.

  Further, the common mold 101 is set with an air hose 108 for blowing air to be released when the main body is released, and a hole (hereinafter, referred to as an air blowing hole) is formed on the side surface. Several places are provided at each required place on the plane. The air blowing hole 103 is normally closed with a gum tape 104 or the like in order to prevent the resin from being blown into the mold 101 when resin is to be described later.

  Next, the process of laminating polyester resin and glass fiber on the temporary installation of the inspection port 105 will be described using FIG. 1B. The lamination method at this time is performed by a hand lay-up molding method (not shown) or a spray-up molding method. By using this method, the thickness of the FRP to be applied can be changed.

  The laminated polyester resin is added with a curing agent and is cured at room temperature. In order to accelerate curing, for example, it may be placed in a warm air oven at 30 ° C. to 60 ° C. for about 20 minutes to 60 minutes. .

  FIG. 1C and FIG. 1D are diagrams showing a process of demolding the laminated resin layer after the laminated resin is cured, that is, the FRP layer (hereinafter abbreviated as FRP layer) 107. Demolding is performed as follows. When the laminated resin is placed in the hot air furnace as described above, the demolding process is started after the temperature of the resin layer is lowered to room temperature. First, hoists are installed as lifting tools at the four corners of the cured FRP layer. Next, air is blown into an air hose made of rubber or the like having excellent pressure resistance attached to the air blowing hole 103. When air is blown, the gummed tape 104 that has blocked the blow hole 103 is peeled off naturally. After releasing the FRP layer by blowing air or the like, the FRP layer 107 is lifted by the hoist 113 and removed. By the above process, the upper tank 109 comprised from FRP provided with the inspection port 105, the mirror part 111, and the upper tank main body flange part 112 is obtained.

  FIG. 1E is a diagram showing an upper tank 109 (hereinafter, sometimes abbreviated as an upper tank) obtained by the steps shown in FIGS. 1A to 1D.

  The mold as the common mold and the auxiliary mold used in the present invention is not particularly limited, and an iron or FRP mold usually used for manufacturing a treatment tank can be used.

  Next, a method for forming the lower tank 210 will be described with reference to FIGS. 2A to 2E. The common mold 101 shown in FIG. 2A is the same as the mold shown in FIG. 1A.

  FIG. 2B is a diagram illustrating a process of laminating a polyester resin and glass fiber on the common mold 101. The resin is laminated by the spray-up molding method 106 or the hand lay-up molding method (not shown) as in the upper tank. By using this method, the thickness of the resin to be applied can be changed.

  2C and 2D are diagrams illustrating a process of demolding the laminated resin layer after the laminated resin is cured, that is, the FRP layer 209. FIG. Demolding is performed as follows in the same manner as in the upper tank. In addition, when the laminated resin is put in the hot air furnace as in the case of the upper tank described above, the demolding step is started after the temperature of the resin layer is lowered to room temperature. First, hoists 113 are installed as lifting tools at the four corners of the cured laminated resin layer. Next, air is blown into an air hose 108 made of rubber or the like having excellent pressure resistance attached to the air blowing hole 103. When air is blown, the gummed tape 104 that has blocked the blow hole 103 is peeled off naturally. After releasing the mold by blowing air or the like, the FRP layer 209 is lifted by the hoist 113 and removed. Through the above steps, the lower tank 210 made of FRP provided with the inspection port 105, the mirror part 111, and the lower tank main body flange part 112 is obtained.

  FIG. 2E shows a lower tank completed by installing a partition plate 201 and a reinforcing plate 202 in a lower tank 210 (hereinafter sometimes abbreviated as a lower tank portion) made of FRP obtained by the steps of FIGS. 2A to 2D. FIG.

  The partition plate 201 and the reinforcement plate 202 are sprayed with glass fiber and polyester resin on an iron for forming the partition plate 201 and the reinforcement plate 202 and a FRP mold separately from the mold for molding the treatment tank body 210. Harden, demold, trim and mold. Both the partition plate 202 and the reinforcing plate 203 are formed with flanges vertically and horizontally. Stability during installation is improved by providing flanges on the top, bottom, left and right. The partition plate 202 and the reinforcing plate 203 are attached to the lower tank portion with glass fibers and polyester resin and attached using bolts. Both ends of the bolt are covered with FRP to prevent water leakage. In addition, a sealing agent such as polyester resin is filled between the flanges of the upper and lower tanks as necessary to prevent water leakage. Thereafter, the flange portion is joined to the processing tank main body 210 with a bolt.

  FIG. 3 is a front view of the processing tank main body 301 of the present example completed by joining the upper tank 109 and the lower tank 210. Furthermore, the side view of FIG. 3 is FIG. 4A. Moreover, the top view of FIG. 3 is FIG. 4B, and the bottom view of FIG. 3 is FIG. 4C. Furthermore, FIG. 5 shows the internal structure of the lower tank 210 completed by installing the partition plate 201 and the reinforcing plate 202 in the lower tank 210. As is apparent from FIGS. 4A to 4C and FIG. 5, the treatment tank body obtained by the above-described process is formed by joining a partition plate and a reinforcing plate at the respective flange portions, and further, flanges of the upper tank body and the lower tank body. It can be seen that it is attached in a very stable state.

  The FRP lamination method of this example is a spray-up molding method or a hand lay-up molding method. These methods have advantages in that the thickness can be easily changed in addition to the economical efficiency of equipment and mold costs, as compared with the conventional rotational molding method.

The manufacturing method of the cylindrical treatment tank of this example can easily adjust the thickness of the FRP, which was difficult with the conventional rotational molding method. Therefore, the thickness of the upper and lower tanks can be adjusted according to the landfill conditions. In addition, the adjustment of the thickness of FRP can be appropriately controlled by adjusting the amounts of resin and glass fiber. The cylindrical treatment tank has a better pressure dispersion due to its shape when filled, compared to the square treatment tank, and the thickness of the FRP can be made thinner than that of the square treatment tank. According to the method for manufacturing a cylindrical treatment tank of the present invention, the thickness of the FRP can be reduced. Further, the pressure applied when the treatment tank is filled differs between the upper and lower tanks. When the landfill depth is 3 m, the pressure is about 51 × 10 ⁻³ N / mm ² . The thickness of the FRP is determined in consideration of various factors such as pressure.

  According to the manufacturing method of the cylindrical treatment tank of this example, for example, the thickness of the FRP in the lower tank is 7 mm to 10 mm, and the thickness of the FRP in the upper tank is the same thickness as the lower tank or about 4 mm at the maximum from the lower tank. The thickness of the FRP in the upper and lower tanks can be easily adjusted according to the installation conditions, for example, by forming the thickness as thin as possible.

  In addition, when attaching the partition plate and the reinforcing plate to the main body, it can be attached simultaneously with the joining of the main body, so that the speed and stability of the assembly work are improved. Furthermore, the problem of peeling off of the mirror part, which was a problem of the conventional method, has been improved by integral molding of the mirror part.

  The FRP of this example is obtained by blending glass fibers and auxiliary materials as reinforcing fibers with a main component polyester resin. As the polyester resin, an ortho-type polyester resin is used in terms of cost.

  The glass fiber of this example mainly uses roving, and an appropriate amount of chopped strand mat is added. Furthermore, the thickness of the FRP can be reduced by appropriately using a roving cloth for partial reinforcement.

  Examples of the auxiliary material used for the FRP of this example include a curing agent, an accelerator, a filler, a release agent, and a colorant. As the curing agent, methyl ethyl ketone peroxide (MEKPO), which is a room temperature curing agent, is used. In this example, methyl ethyl ketone peroxide (MEKPO) manufactured by Kawaguchi Pharmaceutical Co., Ltd. and a trade name “Mepox 55” were used. As a compounding rate, it mix | blends 0.5 weight%-1.5 weight% with respect to the resin amount. As the accelerator, cobalt naphthenate or the like is used. A retarder may be used at high temperatures in summer. As the filler, a polyester resin mixed with 30 to 50 parts by weight, preferably 40 parts by weight of calcium carbonate is used. As the release agent and colorant, those usually used can be appropriately used.

  According to the manufacturing method of the cylindrical treatment tank of the present example, the length can be achieved by joining a previously prepared mold to a predetermined length and molding. Accordingly, it is possible to form a processing tank from a small processing tank having a size of about 1.5 m to a size corresponding to a large truck. Furthermore, the number of molds can be reduced by common molds, and storage problems can be improved.

  As mentioned above, although the example of embodiment for inventing about this invention was demonstrated, this invention is not limited to the structure demonstrated in the above-mentioned embodiment, and does not deviate from the structure of this invention other than this. Various modifications and changes can be made within the range.

(A)-(E) are explanatory drawings of the manufacturing method of the upper tank of the cylindrical processing tank of embodiment of this invention. (A)-(E) are explanatory drawings of the manufacturing method of the lower tank of the cylindrical processing tank of embodiment of this invention. It is a joint figure of the upper tank and lower tank of the cylindrical processing tank of the embodiment of the present invention. (A) is a side view of the cylindrical processing tank of the embodiment of the present invention. (B) is a top view of the cylindrical processing tank of the embodiment of the present invention. (C) is a bottom view of the cylindrical treatment tank of the embodiment of the present invention. It is explanatory drawing of the internal structure of the lower tank of the cylindrical processing tank of embodiment of this invention. It is explanatory drawing of the apparatus used for the manufacturing method of the conventional cylindrical processing tank. It is explanatory drawing of the manufacturing method of the conventional cylindrical processing tank.

Explanation of symbols

  101. Common type, 102. Body flange portion, 103. Hole for air blowing, 104. Gum tape, 105. Auxiliary mold for inspection port, 106. FRP spraying device, 107. Upper tank FRP layer, 108. Hose, 109. Upper tank, 111. Mirror part, 113. Hoist, 201. Partition plate, 202. Reinforcing plate 209. FRP layer, 210. Lower tank

Claims (5)

A method for manufacturing a cylindrical processing tank in which an upper tank and a lower tank of a processing tank made of glass fiber reinforced plastic are separately molded,
As a molding die, a step of molding the lower tank by a common mold for molding a common part to the upper tank and the lower tank,
A process of forming the upper tank by attaching an auxiliary molding die provided with a shape part for forming the inspection port, which is provided only in the upper tank, to the common mold in advance.
The manufacturing method of the cylindrical processing tank characterized by including providing a flange part in the said upper tank and the said lower tank, respectively, and joining this flange part. The part common to the upper tank and the lower tank is a part formed by the common mold,
In the lower tub, including curved mirror portions at both left and right ends in the longitudinal direction of the lower tub, and a flange portion of the lower tub,
The method for manufacturing a cylindrical processing tank according to claim 1, wherein the upper tank includes curved mirror portions at both left and right ends in the longitudinal direction of the upper tank and a flange portion of the upper tank.   The thickness of the glass fiber reinforced plastic is 7 mm to 10 mm in the lower tank, and the upper tank is formed to have the same thickness as the lower tank or a maximum thickness of 4 mm smaller than the lower tank. The manufacturing method of the cylindrical processing tank of Claim 1 or Claim 2.   The cylinder according to any one of claims 1 to 3, wherein the common mold is capable of integrally forming the lower tank and curved mirror portions at both left and right ends in the longitudinal direction of the lower tank. Manufacturing method of the shape processing tank.   5. The auxiliary molding die is capable of integrally molding the upper tank, an inspection port provided only in the upper tank, and curved mirror parts at both left and right ends in the longitudinal direction of the upper tank. The manufacturing method of the cylindrical processing tank as described in any one of these.

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