JP2005239266A - Transportation tank and transportation inner bag - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To prevent a transportation inner bag that is fully loaded from breaking in transporting a liquid using the inner bag put in a tank. <P>SOLUTION: The transportation inner bag 20 is put in a tank body 11 of a tank container, and is provided with a protective cover 17, air vent stoppers 18 and 19, and an inner bag supply/discharge port. The inner bag supply/discharge port is located to correspond to a supply/discharge port 15 of the tank body 11, while the air vent stoppers 18 and 19 are located to correspond to a hatch 13 of the tank body 11. Air contained in a transported material is vented via the air vent stopper 18, and air between double-structured layers is vented via the air vent stopper 19. The protective cover 17 is arranged to encircle respective air vent stoppers 18 and 19 and project spherically, where the air vent stoppers 18 and 19 are located in a cutout 17b formed in the center of the protective cover 17. Hence, the air vent stoppers 18 and 19 are prevented by the protective cover 17 from hitting the inner surface of the hatch 13 even if the stoppers 18 and 19 shift during transportation, so that the transportation inner bag 20 is prevented from being broken. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a transport tank and a transport inner bag.

  In the case of cargo transportation such as ships, railroads and automobiles, tank containers are generally used when the cargo is liquid. As such a tank container, an ISO standard which is an international standard, for example, a 20-foot tank container (hereinafter simply referred to as a tank container) is generally used. The tank container is 20 feet long, 8 feet wide and 8 feet high, and can be filled with about 20 tons of liquid.

  In container transportation using such a tank, it is necessary to clean the tank after transportation, and it is necessary to manufacture a tank using a high-quality stainless steel plate having chemical resistance. As shown in FIG. 1, it has been proposed to manufacture a tank with a general steel plate and to load an inner bag made of a soft synthetic resin having chemical resistance into the tank. Further, Patent Documents 2 to 5 propose a method in which an inner bag is similarly loaded in a tank so as to save time and effort for cleaning.

JP-A 61-104983 JP 2001-354292 A Japanese Utility Model Publication No. 61-48190 Japanese Patent Laid-Open No. 50-4615 Japanese Utility Model Publication No. 57-46492

  However, as for the tanks and tank containers having the conventional inner bags, various proposals have been made as in Patent Documents 1 to 5, but it is appropriate for a large tank such as a 20-foot tank container. Currently, it is difficult to manufacture the bag and it has not been put into practical use. That is, it has been difficult to easily and inexpensively manufacture an inner bag suitable for a cylindrical tank having a length of 20 feet, a width of 8 feet, and a height of 8 feet.

  For example, as the inner bag adapted to the shape of the tank container, a cylindrical body having substantially the same shape as the tank container is ideal. However, in this case, it is necessary to weld a circular lid film to both ends of the cylindrical film, and it takes time and labor to form the circular lid film and weld it, which makes it difficult to manufacture. Moreover, in the welding of the circular lid film, it is impossible to weld in the two-dimensional direction, and the welding is performed in the three-dimensional direction. Therefore, a dedicated guide device for welding these films is required. There is also a problem.

  On the other hand, by using an envelope-type inner bag, it is only necessary to weld both ends of the cylindrical film, which facilitates manufacture. In this inner bag, by setting the inlet / outlet of the inner bag at the inlet / outlet of the tank, the liquid does not directly contact the inner surface of the tank. Therefore, by replacing the inner bag, the cleaning process in the tank, which has been conventionally required, becomes unnecessary.

  However, it has been found that the following problems occur in the process of developing such an inner bag. In other words, when transporting in a fully loaded state close to the transport amount of the tank, plug members such as air vent plugs and supply / discharge ports located in the hatch of the tank body move in the hatch due to liquid shaking during transport. . Due to this movement, the plug member may be locked to the inner surface of the hatch. In this case, an excessive force acts on the inner bag body portion welded to the locked plug member, and this portion is damaged. Improvements were desired.

  The present invention has been made to solve the above problems, and an object of the present invention is to provide a transport tank and a transport inner bag in which the inner bag is not damaged even when transported in a full state.

  In order to achieve the above object, a transport tank according to the present invention comprises a tank main body having a hatch, and an inner bag supply / discharge that is detachably mounted in the tank main body and fitted into a tank supply / discharge port of the tank main body. A transport tank having a mouth and a transport inner bag into which transported goods are put from the inner bag supply / discharge port, the stopper member formed on the transport inner bag at a position corresponding to the hatch, and the stopper And a guide member for guiding the member from the hatch into the tank body. The guide member is a tank-side guide member disposed in the hatch, and the guide member is preferably a tank-side guide member having a guide surface that guides the plug member into the tank body. Further, the guide member is an inner bag side guide member attached to the transport inner bag, and the guide member is formed in a spherical shape, a conical shape, or a pyramid formed higher than the plug member so as to surround the plug member. It is preferable that it is formed in a shape. Further, the transport inner bag has a multilayer structure in which a plurality of inner bag main bodies are stacked and accommodated, and the plug member is an interlayer air vent plug provided for venting air between the plurality of inner bag main bodies. Preferably there is. Moreover, it is preferable that the said plug member is an air vent plug in a package provided in order to extract the air in the said package. It is further preferable to have a handle portion around the plug member or the plug member.

  Further, the transport inner bag of the present invention is detachably mounted in a transport tank having a hatch, and is fitted into a synthetic resin inner bag main body and a tank supply / exhaust port disposed at a lower portion of the transport tank. A transport inner bag having a bag supply / discharge port, a plug member provided in the inner bag main body at a position corresponding to the hatch, and attached to the inner bag main body so as to surround the plug member, the plug member And an inner bag side guide member having a spherical shape, a conical shape, or a pyramid shape, which is formed higher than the inner shape. The inner bag main body has a multilayer structure in which a plurality of inner bag main bodies are stacked and stored, and the plug member is an interlayer air vent plug provided for venting air between the plurality of inner bag main bodies, or in the transported goods. It is preferable that it is the air vent plug in a package provided in order to extract air. It is further preferable to have a handle portion around the plug member or the plug member.

  In the present invention, since the guide member is provided to guide the plug member into the tank body from the inside of the hatch, the plug member positioned in a state of protruding into the hatch in a fully loaded state is locked to the inner surface of the hatch. This eliminates the breakage of the inner bag due to the locking. In addition, by using the tank side guide member disposed in the hatch as the guide member, the running cost can be reduced without being discarded like a transport inner bag after use. Further, by using the inner bag side guide member attached to the transport inner bag as the guide member, there is no need to load the guide member when closing the hatch, unlike the tank side guide member. Furthermore, by having a handle portion for lifting the inner bag body portion to which the plug member is attached around the plug member or the plug member, when the plug member is an air vent plug, the handle portion can be easily and reliably lifted. It is possible to vent the air.

  FIG. 1 shows a 20 foot ISO tank container 10 which is composed of a tank body 11 and a frame 12 for holding the tank body 11. A hatch 13 for performing maintenance, liquid injection, and the like is formed on the upper portion of the tank main body 11, and this hatch 13 is covered with a lid 14 so that the lid 14 does not open during transportation. Locked by. A tank supply / exhaust port 15 is formed at a lower end of the tank main body 11, and a foot valve 16 is fixed via a flange 15 a of the tank supply / discharge port 15.

  A transport inner bag 20 is loaded in the tank body 11. The transport inner bag 20 is brought into the tank main body 11 by the operator from the hatch 13 and is set in the tank main body 11 by the operator. Then, liquid as cargo is put into the transport inner bag 20 from the tank supply / discharge port 15 via the foot valve 16, so that the transport inner bag 20 inflates in the tank main body 11, and this transport inner bag 20 is in the tank main body 11. Acts as a lining. In addition, after filling the liquid, the air in the transport inner bag 20 is extracted from the air vent plugs 18 and 19 located in the hatch 13.

  As shown in FIG. 2A, the transport inner bag 20 includes an inner bag main body 21 formed in an envelope shape, an inner bag supply / discharge port 22 that fits into the tank supply / discharge port 15, and an air vent plug 18. , 19 and a protective cover 17 as a guide member. Since the transport inner bag 20 is formed in an envelope shape, as shown in FIG. 6 (A), the cylindrical film 23 is pulled out from the film roll 24 obtained by winding the cylindrical film 23 in a roll shape, The inner bag body 21 can be easily formed by cutting into lengths and joining the both ends 23c-23f of the cut cylindrical films 23a, 23b by heat welding, ultrasonic welding, or the like.

  2A and 2B show the dimensional relationship between the tank body 11 and the transport inner bag 20. FIG. 2A is a plan view of the tank body 11 and the transport inner bag 20, and FIG. The surface and the inner bag 20 for transport are shown in FIG. 5C, and the longitudinal cross section of the tank body 11 and the inner bag 20 for transport are shown. Here, the longitudinal cross section refers to a longitudinal section (BB cross section) including a center line CL1 extending in the longitudinal direction of the tank body 11 in the plan view of FIG. A vertical cross section (CC cross section) including a center line CL2 extending in the width direction of the main body 11 is referred to. CL3 indicates a center line extending in the height direction of the tank body 11.

  The tank body 11 is configured in a cylindrical shape that is horizontally placed and closed at both ends, and the transport inner bag 20 is configured in an envelope shape. Therefore, when the size of the transport inner bag 20 is smaller than the appropriate size range matched to the tank body 11, not only can a predetermined filling capacity be secured, but also the inner peripheral surface of the tank body 11 and the transport inner bag. A gap is generated between the inner bag 20 and the inner bag 20 and the liquid in the inner bag 20 move in the gap. May be damaged at the welding lines at both ends of the. Conversely, if the size of the transport inner bag 20 is larger than the appropriate size range matched to the tank body 11, not only will the raw material be wasted, but also the surplus portion such as the end of the transport inner bag 20 When positioned below the filled liquid, the end of the transport inner bag 20 is sandwiched between the inner bag body 21 filled with the liquid and the inner peripheral surface of the tank body 11 by the weight of the filled liquid. It becomes impossible to fill with more liquid. Further, when the liquid filling is continued as it is, the internal pressure of the transport inner bag 20 is increased and may be damaged.

In the present embodiment, by defining the size of the envelope-type transport inner bag 20 within a certain range on the basis of the size of the tank body 11, the above-described liquid filling failure, breakage of the transport inner bag 20, etc. Is preventing. The length of the transport inner bag 20 is IL, the width is IW, the inner peripheral length (first inner peripheral length) in the longitudinal longitudinal section of the tank body 11 is TLt, and the inner circumference length (first in the widthwise longitudinal section of the tank body 11). (2 inner circumference) is TLr,
0.47 · TLt ≦ IL ≦ 0.6 · TLt,
0.47 · TLr ≦ IW ≦ 0.6 · TLr.
The IL and IW are preferably 0.49 · TLt ≦ IL ≦ 0.55 · TLt,
0.49 · TLr ≦ IW ≦ 0.58 · TLr.
Thus, since the size of the envelope-type transport inner bag 20 is defined based on the inner peripheral length of the tank main body 11, the shape of the tank main body 11 is not limited to the cylindrical shape, but may be other elliptical shapes or other shapes. Even if it exists, it can be applied easily.

  The inner bag supply / discharge port 22 is provided on or near the center line extending in the longitudinal direction at a position away from one end of the transport inner bag 20 by L1 = 1750 mm. In this way, by defining L1 within the range of 0.44 · IW ≦ L1 ≦ 0.50 · IW with reference to the width IW of the transport inner bag 20, the tank formed at the lower end of one end of the tank body 11 Even if the transport inner bag 20 is attached with the supply / discharge port 15 as a reference, the center positions of the tank body 11 and the transport inner bag 20 in the longitudinal direction can be matched. Thereby, the surplus part of the both ends of the transport inner bag 20 can be distributed in the tank body 11 almost evenly. Therefore, the excess portion of the end portion of the transport inner bag 20 is not left on one side of the tank main body 11 and is not sandwiched between the tank main body 11 and the transport inner bag 20, and liquid filling failure due to this is prevented. And inner bag breakage.

  As shown in FIG. 2 (A), the air vent plugs 18 and 19 are connected to the surface opposite to the inner bag supply / exhaust port 22 (the upper surface when loading the inner bag) from the inner bag supply / exhaust port 22. It is provided on a center line extending in the longitudinal direction at a position separated by L2 = 2255 mm, and is provided slightly apart from each other. Since the air vent plugs 18 and 19 are attached to the inner bag main body 21 with the inner bag supply / discharge port 22 as a reference in this way, when the inner bag main body 21 is loaded into the tank main body 11 and filled with liquid, As shown in FIG. 1, the air vent plugs 18 and 19 are located in the hatch 13.

  The air bag stopper 18 in the package is used to vent the air in the inner cylindrical film 23a. As shown in FIGS. 5 (A) and 5 (B), the in-transport air vent plug 18 is composed of a plug main body 18a, a welding flange 18b, a cap 18c, and a handle portion 18d. A mounting flange 18b is applied to the mounting hole 28a formed so as to penetrate the inner cylindrical film 23a and the outer cylindrical film 23b, and the welding flange 18b, the inner cylindrical film 23a, and the outer cylinder are covered. The film 23b is integrally welded by the welding line 18f. In (B), the welding flange 18b is disposed outside the outer cylindrical film 23b and welded thereto. However, even if the welding flange 18b is positioned inside the cylindrical films 23a and 23b, these are welded. Good.

  Further, as shown in FIG. 5C, the interlayer air vent plug 19 is for venting air between the inner cylindrical film 23a and the outer cylindrical film 23b having a double structure. This interlayer air vent plug 19 is also configured in the same manner as the air vent plug 18 in the package, and includes a main body 19a, a welding flange 19b, a cap 19c, and a handle portion 19d, and is formed on the outer cylindrical film 23b. The mounting flange 28b is covered with a welding flange 19b from the outside, and the welding flange 19b, the outer cylindrical film 23b, and the inner cylindrical flange 23a are integrally welded by a welding line 19f. The welding flange 19b may be positioned and welded inside the outer cylindrical film 23b. Further, the sealing O-rings 18g and 19g are attached to the caps 18c and 19c, but other sealing members such as packing may be used instead of the O-rings 18g and 19g.

  The handle portion 18d is configured to be raised by an arcuate cut line 18e. By causing the grip portion 18d, the inner bag portion to which the air vent plug 18 is attached can be lifted upward. Thereby, air accumulated in the inner bag main body 21 can be collected around the air vent plug 18, and the air can be easily discharged to the outside. The handle portion 19d is configured similarly to the handle portion 18d. The handle portions 18d and 19d are not limited to a ring shape, and may have various shapes, and their attachment positions may be changed as appropriate, and may be provided on the protective cover 17, for example.

  As shown in FIGS. 3 and 4, a protective cover 17 is attached so as to surround the air vent plugs 18 and 19. The protective cover 17 includes a cover body 17a protruding in a spherical shape and a notch 17b formed at the center of the cover body 17a, and is thermally welded or bonded to the inner bag body 21. As will be described later, when the inner bag main body 21 is mounted in the tank main body 11, the protective cover 17 is filled with liquid and transported in a substantially full state, the air vent plugs 18 and 19 are placed in the hatch 13. It moves so as not to be locked to the inner surface 13 a of the hatch 13. The protective cover 17 only needs to be able to guide the air vent plugs 18 and 19 so as not to hit the inner surface 13a of the hatch 13, and is not limited to a spherical shape, but a conical shape, a pyramid shape, or the like. It may be a shape.

  Next, a method for manufacturing the transport inner bag 20 will be described. As shown in the flowchart of FIG. 7, cutting the cylindrical film, duplicating the cylindrical film, forming a mounting hole, mounting the inner bag supply / exhaust port, mounting the air vent plug, mounting the protective cover (guide member), the cylindrical film The steps of welding one end of the film, bleeding the air, welding the other end of the cylindrical film, recording the positioning mark, folding the inner bag body, and packing are sequentially performed, and the inner bag 20 is transported from the cylindrical film 23. Is configured.

  As shown in FIG. 6A, in the step of cutting the cylindrical film, the cylindrical film 23 is pulled out from the film roll 24, placed on the work table 25, and cut by a cutter 26 with a length IL, for example. The cylindrical film 23 is made of LLDPE (linear low density polyethylene) and is wound and stored in a roll form. In the present embodiment, since the inner bag main body 21 is doubled, as shown in (B), the cylindrical film 23 is cut twice with a length IL to form two cylindrical films 23a and 23b. In this embodiment, since the inner bag is for a 20-foot tank container, IL = 8300 mm, IW = from the first inner circumference TLt≈15500 mm and the second inner circumference TLr≈7100 mm of the transport tank based on the above appropriate range. It is 3900 mm. The thickness of the single film layer of the cylindrical film 23 is 120 μm, and in this embodiment, the cylindrical film 23 has two layers, so the total thickness of the cylindrical film 23 is 240 μm. The film thickness is preferably in the range of 80 to 500 μm, particularly preferably in the range of 100 to 300 μm.

  As shown in FIG. 6C, in the duplexing process of the tubular films 23a and 23b, the tubular film 23a is put over the other tubular film 23b to be duplexed. Next, as shown in (D), in the drilling step, an inner bag supply / discharge port mounting hole 27 corresponding to the supply / discharge port is formed in the center in the width direction at a position L1 = 1750 mm away from one end 23d. Further, two air vent plug mounting holes 28a and 28b are opened at a position L2 = 2255 mm away from the inner bag supply / discharge port mounting hole 27. These drilling processes are performed using a punch or a cutter. The inner bag inlet / outlet mounting hole 27 and the package air vent plug mounting hole 28a are formed in a two-layer film (an inner cylindrical film 23a and an outer cylindrical film 23b), and the other interlayer air vent plug mounting hole. 28b is formed only on the outer cylindrical film 23b which is the uppermost layer.

  As shown in FIG. 8E, in the inner bag supply / exhaust port 22 attachment process, the inner bag supply / exhaust port 22 is thermally welded to the periphery of the opened hole 27. This thermal welding is also performed only on the upper two-layer film. The inner bag supply / exhaust port 22 includes a truncated conical cylindrical supply / discharge port main body 22a and flanges 22b and 22c attached to both ends of the main bag supply / discharge port body 22a. The lower flange is welded, and the welding flange 22b and the inner bag main body 21 are thermally welded by a heat welder (not shown) to form welding lines 27b and 27c. The upper mounting flange 22c protrudes outside the flange 15a of the tank supply / discharge port 15 when the inner bag supply / discharge port 22 is inserted into the tank supply / discharge port 15 (see FIG. 8) from the inside of the tank. The mounting flange 22c is in close contact with 15a.

  As shown in FIG. 11, the flange 30 a of the inner bag suction preventing member 30 and the foot valve 16 are attached to the flange 15 a of the tank supply / discharge port 15, whereby the inner bag supply / discharge port 22 is connected to the tank supply / discharge port 15. It can be securely attached. The supply / discharge port body 22 a is formed along the inner peripheral surface of the tank supply / discharge port 15.

  Similarly, as shown in FIGS. 5 and 9F, the air vent plugs 18 and 19 are thermally welded to the air vent plug mounting holes. The air vent plugs 18 and 19 are also made of LLDPE, but are not limited thereto. After the air vent plugs 18 and 19 are attached, the protective cover 17 is attached so as to surround the air vent plugs 18 and 19. The protective cover 17 is composed of a cover body 17a formed to project in a spherical shape, and a circular notch 17b provided at the center of the cover body 17a, and each air is provided in the notch 17b. It is heat-welded or bonded to the inner bag body 21 so that the stoppers 18 and 19 are inserted. The protective cover 17 is also made of LLDPE, but is not limited to this. The protruding height H1 of the cover body 17a is formed higher than the height H2 of the air vent plugs 18 and 19 so that the air vent plugs 18 and 19 do not protrude from the protective cover 17.

  As shown in FIG. 9G, in the step of welding one end portion of the cylindrical film, the four layers of the film portions 23c, 23e of the doubled cylindrical films 23a, 23b are simultaneously heat welded by the heat welder 33. Thus, the heat welding lines 35a and 35b are formed, and the one end portions 23c and 23e are closed. The heat welder 33 includes a cradle 33a and a weld head 33b, and heat is applied in a state where the weld head 33b is lowered and the tubular film end portion 23c is sandwiched between the cradle 33a.

  As shown in FIG. 10A, the thermal welding lines 35a and 35b are linear in a width of 5 mm in the present embodiment, and these thermal welding lines 35a and 35b are formed in two strips with a gap of 5 to 10 mm. However, the number of the heat welding lines may be one or three or more, and may be a welding line such as a waveform instead of a straight line. When forming a multiple-line heat welding line, each welding line may be formed in a lump or may be formed in order on one side. (A) is a case where the end portions of the inner and outer cylindrical films 23a, 23b are welded in a four-layer state. In this case, even if the heat welding lines 35a, 35b are collectively formed, one side at a time. It may be formed. (B) First, only one end of the inner cylindrical film 23a is welded to form a heat welding line 36a, and then one end of the inner and outer cylindrical films 23a and 23b is connected to the previous welding line 36a. The heat welding line 36b is formed by welding together in a four-layer state on the outside. In (C), the inner cylindrical film 23a is slightly shorter than the outer one, and the ends of the respective cylindrical films 23a and 23b are individually heat-sealed in a two-layer state, and heat-welded. Lines 37a and 37b are formed. In addition, the thermal welding line may be welded for the entire width at a time, and when the length of the welding head 33b is limited, the thermal welding line may be sequentially welded by the length of the welding head 33b. The heat welder 23 employs a heat seal method, but may be performed by an ultrasonic welding method or other welding methods.

  As shown in FIG. 9 (H), in the air venting process, the pressure roller 38 is rolled on the work table 25 from the one end 23c to the other end 23d of the tubular films 23a and 23b. The air 39 of the doubled inner bag body 21 is removed. The air bleeding may be performed by simply rolling or pressing the inner bag body 21 from one end side to the other end side instead of winding the pressing roller 38. Since the air vent plugs 18 and 19 and the inner bag supply / exhaust port 22 are attached along the center line, the pressing roller 38 is operated so as to avoid these portions. Further, instead of the operation of avoiding the pressing roller 38, air may be ventilated by using a roller in which a belt-like groove is formed in the central portion of the pressing roller 38 or using a small roller.

  As shown in (J), in the welding process of the other end portions 23d and 23f of the tubular films 23a and 23b, the other end portions 23d and 23f of the tubular films 23a and 23b which are bleed are the same as the one end portions 23c and 23e. The inner bag 20 is completed as shown in FIG. 11 (A). A linear positioning mark 45 is recorded on the inner bag 20 with oil-based ink or the like along a center line extending in the longitudinal direction. After completion of the inner bag 20, the inner bag body 21 is folded and stored in the packing bag 40. In the present embodiment, the positioning mark 45 has a line shape. However, the positioning mark 45 only needs to be able to be positioned, and the shape and size thereof are not particularly limited.

  As shown in FIG. 12 (A), the inner bag body 21 is folded along the center line (positioning mark 45) where both side edges 21a, 21b extend in the longitudinal direction with the inner bag supply / discharge port 22 facing downward. The valley folds are made along the valley fold line 21e in parallel and so that the side edges 21a and 21b are close to the center line. Similarly, this valley-folded portion is again folded in parallel along the valley fold line 21f so as to be parallel to the center line extending in the longitudinal direction and the valley fold line 21e close to the center line, and is folded twice. And as shown in (B), along the valley fold line 21g from the both end portions 21c, 21d of the inner bag main body 21 toward the inner bag supply / exhaust port 22 in a state where the valley folds are made at the valley fold lines 21e, 21f. As shown in (C), the inner bag main body 21 is folded into a small size by further performing valley folding several times. Instead of the valley fold along the valley fold line 21g, it may be wound up from one end and formed into a roll shape. And it is accommodated in the packaging bag 40 as shown to (D). Thus, the inner bag main body 21 can be accommodated compactly by folding it double along the valley fold lines 21e and 21f. Further, the number of times of valley folding parallel to the center line extending in the longitudinal direction is not limited to two times, and may be one time or three times or more. Further, when the air vent plugs 18 and 19 are folded and stored in the packing bag, when the air vent plugs are folded so that the contact portion of the inner bag main body 21 does not partially extend by the air vent plugs. A sponge-like protective sheet is applied.

  By folding the inner bag main body 21 so that the inner bag supply / discharge port 22 is on the outer side, the inner bag supply / discharge port 22 can be easily set in the tank supply / discharge port 15. Further, the inner bag body 21 is easily folded in the longitudinal direction of the tank body 11 with the inner bag supply / discharge port 22 set to the tank supply / discharge port 15 by folding the inner bag body 21 with the valley fold line 21g. Can be expanded. Moreover, by filling the liquid from the inner bag supply / discharge port 22 with the inner bag supply / discharge port 22 facing downward, the folds are folded at the valley fold lines 21e and 21f, so that the bag is folded by the filled liquid. The inner bag body 21 thus expanded naturally expands.

  Next, a method for setting the inner bag body 21 to the tank body 11 will be described. The inner bag 20 is brought into the tank body 11 from the hatch 13 while being stored in the packing bag 40 by the operator, and the inner bag 20 is taken out of the packing bag 40. A linear positioning mark 45 is recorded on the inner bag 20 so as to correspond to the center line CL1 extending in the longitudinal direction of the tank body 11, and the positioning mark 45 is center line CL1 extending in the longitudinal direction of the tank body 11. The inner bag supply / exhaust port 22 is inserted into the tank supply / exhaust port 15 so as to match. Before this insertion, the foot valve 16 is removed from the flange 15a of the tank supply / discharge port 15. By this insertion, the mounting flange 22 c is brought into close contact with the flange 15 a of the tank supply / discharge port 15. Next, the inner bag body 21 folded at the valley fold line 21g is developed in the tank longitudinal direction. Next, the portion folded at the valley fold line 21f is developed, and the mounting operation in the tank body 11 is completed. In addition, the both-sides edge part folded by the valley fold line 21e is made into the folded state. This is because the inner bag body 21 in the folded state covers almost the entire width of the bottom of the tank body 11, and even if the valley fold at the valley fold line 21e is developed, it is folded again by its own weight. Thereafter, as shown in FIG. 8, the inner bag suction preventing member 30, the foot valve 16, and the like are attached to the tank supply / exhaust port 15 from the outside of the tank body 11.

  The liquid as cargo is filled from the tank supply / discharge port 15. This filling speed is performed at, for example, 50 liters / min. Since the inner bag main body 21 is expanded in the longitudinal direction in the tank main body 11, the liquid is smoothly filled into the inner bag main body 21, and the inner bag main body 21 expands by this filling. And even if the side edge portion is valley-folded, the folded portion gradually expands with the filling of the liquid, and the end portion of the inner bag main body 21 in the tank main body 11 is the portion of the inner bag main body 21 of the portion filled with the liquid. Without being sandwiched between the inner bag main body 21 and the tank main body 11 by weight, the inner bag main body 21 is smoothly inflated by filling with liquid, and about 20 tons of liquid is stored.

  When the filling of the liquid is completed and almost full, the air vent plugs 18 and 19 are located in the hatch 13. Since the inner bag main body 21 is transparent, if air is contained in the liquid, this can be observed from the outside. The air mixed in the liquid can be extracted by loosening the cap 18c of the package air release plug 18. Also, the air that has entered between the inner cylindrical film 23a and the outer cylindrical film 23b during manufacture can be easily removed by loosening the cap 19c of the interlayer air vent plug 19. At this time, as shown in FIG. 4, by holding the handle portion 18d and lifting the inner bag body portion to which the air vent plug 18 is attached, the air in the inner bag body 21 is lifted to the inner bag body portion. Because it concentrates, the air can be easily removed.

  In addition, when the transport inner bag 20 is inclined and mounted in the tank body 11, the air vent plugs 18 and 19 may not be positioned at the position of the hatch 13. In preparation for such a case, a string or the like is tied to the grip portions 18d and 19d of the air vent plugs 18 and 19, and the string is pulled in the hatch 13 before or after the filling in accordance with the filling state. Air vent plugs 18 and 19 may be positioned. As a result, the positions of the air vent plugs 18 and 19 due to poor mounting of the transport inner bag 20 can be corrected.

  In the present embodiment, the inner bag main body 21 is set by being expanded in the vertical direction in the tank main body 11, but the inner bag main body 21 is valley-folded toward the center line whose side edge extends in the width direction. Since air does not enter the inner bag main body 21, it is possible to cope with anaerobic liquids. Moreover, since the inner bag main body 21 and the inner bag supply / discharge port 22 are made of LLDPE having high chemical resistance, the material of the tank main body 11 is not limited, and the inner peripheral surface of the tank is made of, for example, poly There is no need to line with a fluororesin such as tetrafluoroethylene.

  The inner bag suction preventing member 30 disposed in the inner bag supply / discharge port 22 from the tank supply / discharge port 15 reduces the residual liquid when discharging the liquid, so that the inner bag body 21 is close to the inner bag supply / discharge port 22. A passage is secured between the inner bag body 21 and the inner bag body 21 so as not to suck the inner bag body 21 located nearby and close the supply / discharge port 22. The inner bag suction preventing member 30 includes a hemispherical tip portion 30b that protrudes into the tank body 11, a cylindrical portion 30d that has a plurality of communication holes 30c on the circumferential surface, and a cylindrical portion 30d. A mounting flange 30a provided on the base is integrally formed. The protrusion of the hemispherical tip 30b into the inner bag main body 21 prevents the inner bag main body 21 from coming into close contact with the supply / exhaust port 22, and the remaining liquid in the inner bag main body 21 is surely secured through the communication hole 30c. To be discharged.

  The inner bag 20 is made of LLDPE, but may be made of LDPE (low density polyethylene), OP (biaxially stretched polypropylene), or other synthetic resins. Moreover, although the inner bag main body 21 was duplexed, it may replace with this and may be single, triple, and multiplexed. Moreover, although the tank main body 11 was comprised in the cylindrical shape, it can replace with this and this invention can be implemented also about what was comprised in the elliptical cylinder shape and other shapes. Moreover, although the inner bag 20 was used for the tank container 10, it can also be used as tank inner bags, such as a tank lorry. Moreover, although the envelope type transport inner bag 20 has been described in the above embodiment, the shape of the inner bag is not limited to the envelope type, and may be a cylindrical shape or other various shapes.

  In the above embodiment, two air vent plugs 18 and interlayer air vent plugs 19 are provided in the package, but only one of them may be provided. Moreover, as shown in FIG. 13, it is good also as a double structure which provided the air vent plug 51 in the package in the interlayer air vent plug 50. FIG. (A) shows the transportation state with the plugs 50 and 51 closed, and (B) shows that the outer cap 50a is removed and the inner cap 51a is loosened to release air from the package. In addition, air bleeding between the outer cylindrical films 23a and 23b is also performed. Reference numeral 52 denotes an air vent communication hole between the inner cylindrical film 23a and the outer cylindrical film 23b, 53 an air vent communication hole provided in the cap 51a, and 54 an O-ring. In this embodiment, since the package air vent plug 18 is disposed in the interlayer air vent plug 19, even if liquid leaks from the package air vent plug 18, it stays in the outer cylindrical film 23b. There will be no leakage.

  In addition, although the air vent communication hole 53 is formed, the air may be vented using a gap when the cap is simply loosened. Further, in addition to air removal by loosening the cap and air removal via the communication hole 53, for example, a valve may be provided and air may be extracted by this valve.

  Further, the protective cover 17 is fixed to the inner bag body 21 by heat welding or adhesion, but instead of this, a fitting portion that fits a part or the periphery of the air vent plug and the protective cover is formed. Alternatively, the protective cover may be detachably attached to the inner bag body by fitting. In this case, even when the inner bag body is discarded after use, the protective cover can be removed and used again.

  Moreover, although the protective cover 17 was attached to the inner bag main body 21, it may replace with this and may be attached to the hatch 13 side as shown in FIG. In this case, the protective cover 60 is attached by locking the hatch 13 with a locking member (not shown). The protective cover 60 is formed in a cylindrical shape fitted into the hatch 13, and a guide surface 60 a made up of a substantially spherical concave surface is formed on the bottom surface, and the air of the inner bag main body 21 is formed via the guide surface 60 a. The stopper plug 18 is smoothly guided from the hatch 13 to the tank inner surface 62. The guide surface 60a may be formed on the same surface as the tank inner surface 62 instead of being recessed in a spherical shape. In this case, a plug member such as the air vent plug 18 is locked to the inner surface 13a of the hatch 13. Nothing will happen. The protective cover 60 may be made of wood or metal in addition to the synthetic resin such as foamed polystyrene or rubber.

  In the above embodiment, the air vent plugs 18 and 19 have been described as examples. However, the air vent plugs and 19 are not limited to the air vent plugs. For example, plugs and valves that close the supply / discharge ports attached to the inner bag main body 21 at positions corresponding to the hatch 13 are used. You may implement this invention with respect to these various plug members.

It is a front view which shows the tank container in which the transport tank of this invention is used. It is explanatory drawing of the size of the transport inner bag which fits a tank main body, (A) is a plane of a tank main body and a transport inner bag, (B) is a longitudinal direction longitudinal cross-section of a tank main body, (C) is a tank main body. A longitudinal section in the width direction is shown. It is a longitudinal cross-sectional view which shows the air vent plug and protective cover in a hatch. It is a perspective view which shows the air vent plug and protective cover of the state which raised the handle part. 1A and 1B show an air vent plug, in which FIG. 1A is a plan view, FIG. 1B is a longitudinal sectional view showing an air vent plug in a package, and FIG. 1C is a longitudinal sectional view showing an interlayer air vent plug. It is a schematic perspective view which shows the manufacturing method of a transport inner bag. It is a flowchart which shows the manufacturing method of a transport inner bag. It is a perspective view which shows the welding process of the supply / discharge port in the manufacturing method of a transport inner bag. It is a perspective view which shows an air bleeding plug attachment process, the welding process of the both ends of a cylindrical film, and an air bleeding process. It is a top view which expands and shows the welding line of an inner bag main part, (A) is the example which carried out the heat welding of the inner side and the outer side cylindrical film collectively in the four-layer state, (B) is an inner side cylindrical film. An example in which the inner and outer tubular films are thermally welded together in a four-layer state after only the end portions are thermally welded in a two-layer state. (C) is an example of an inner tubular film and an outer tubular film, respectively. Each of these examples shows an example of heat-welding the two ends in a two-layer state. It is sectional drawing which shows the state which attached the inner bag supply / discharge port to the tank supply / discharge port. It is explanatory drawing which shows the folding method of a transport inner bag. It is sectional drawing which shows the air bleeding stopper in another embodiment, (A) shows the transportation state which carried out the cap, (B) has shown the air bleeding state. It is sectional drawing which shows the protective cover in another embodiment.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Tank container 11 Tank main body 15 Tank supply / exhaust port 16 Foot valve 17 Protective cover 18 Transported goods air vent plug 19 Interlayer air vent plug 20 Transport inner bag 21 Inner bag main body 22 Inner bag supply / discharge port 23 Cylindrical film 30 Inner bag suction Prevention member 50, 51 Air vent plug 60 Protective cover

Claims (10)

A tank main body having a hatch, and an inner bag supply / exhaust port that is detachably mounted in the tank main body and is fitted to a tank supply / exhaust port of the tank main body, and a transported object is received from the inner bag supply / exhaust port In a transport tank having a transport inner bag to be put in,
A stopper member formed on the transport inner bag at a position corresponding to the hatch;
A transport tank comprising a guide member for guiding the stopper member from the hatch into the tank body.   The guide member is a tank-side guide member disposed in the hatch, and the guide member is a tank-side guide member having a guide surface for guiding the plug member into the tank body. The transport tank according to claim 1.   The guide member is an inner bag side guide member attached to the transport inner bag, and the guide member has a spherical shape, a conical shape, or a pyramid shape that is formed higher than the plug member so as to surround the plug member. The transport tank according to claim 1 or 2, wherein the transport tank is formed.   The transport inner bag has a multilayer structure in which a plurality of inner bag main bodies are stacked and housed, and the plug member is an interlayer air vent plug provided for venting air between the plurality of inner bag main bodies. The transport tank according to any one of claims 1 to 3, characterized in that:   The transport tank according to any one of claims 1 to 4, wherein the plug member is an air vent plug in a package provided for extracting air in the package.   The transport tank according to any one of claims 1 to 5, further comprising a handle portion on or around the plug member. A transport inner bag, which is detachably mounted in a transport tank having a hatch, and has an inner bag body made of synthetic resin and an inner bag supply / discharge port fitted to a tank supply / discharge port arranged at the lower part of the transport tank. In
A stopper member provided in the inner bag body at a position corresponding to the hatch;
A transport inner bag comprising a spherical, conical or pyramidal inner bag side guide member attached to the inner bag body so as to surround the stopper member and formed higher than the stopper member.   The inner bag main body has a multilayer structure in which a plurality of the inner bag main bodies are stored in a stacked manner, and the plug member is an interlayer air vent plug provided for extracting air between the plurality of inner bag main bodies. The transport inner bag according to 7.   The transport inner bag according to claim 7 or 8, wherein the plug member is an air vent plug in a package provided for extracting air in the package.   The transport inner bag according to any one of claims 7 to 9, further comprising a handle portion on or around the stopper member.

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