Transport tank and transporting method thereof
A transport inner bag and a pressure inner bag are loaded in a tank body of a tank container. A supply-discharge opening for the transport inner bag is provided in a position corresponding to a tank supply-discharge opening, and cargo is filled through the opening. A supply-discharge opening for the pressure inner bag is provided in a position corresponding to a hatch of the tank body, and air is filled through the opening to expand the pressure inner bag, so that a space between the transport inner bag and an inner surface of the tank body is filled as well as the gap in between. This prevents the transport inner bag from moving in the tank body in transporting in a state that the cargo is not fully loaded in the transport inner bag, so that the breakage of the transport inner bag caused by the movement is prevented.
Latest Patents:
- METHODS AND COMPOSITIONS FOR RNA-GUIDED TREATMENT OF HIV INFECTION
- IRRIGATION TUBING WITH REGULATED FLUID EMISSION
- RESISTIVE MEMORY ELEMENTS ACCESSED BY BIPOLAR JUNCTION TRANSISTORS
- SIDELINK COMMUNICATION METHOD AND APPARATUS, AND DEVICE AND STORAGE MEDIUM
- SEMICONDUCTOR STRUCTURE HAVING MEMORY DEVICE AND METHOD OF FORMING THE SAME
1. Field of the Invention
The present invention relates to a transport tank to be transported with containing a cargo in a transport inner bag, and more specifically, a transport tank having a pressure inner bag for preventing the transport inner bag from moving in a tank body of the transport tank during transportation, and transporting method thereof.
2. Description of the Prior Arts
In cargo transportation by sea, railroad, road and so forth, a tank container is generally used for liquid materials (cargo). As the tank container, a 20 foot container (hereinafter referred to as a tank container) which conforms to the ISO Standards is ordinarily used, for example. The tank container has 20 foot length, 8 foot width, and 8 foot height, so that about 20 tons of liquid can be filled therein.
In the container transportation to use this kind of tank container, it is necessary to wash the inside of the tank after transportation, and in addition, to produce the tank by using a high quality stainless steel plate with chemical resistance. In order to solve the problems, Japanese Patent Laid-Open Publication No. S61-104983 discloses that an inner bag or liner bag made of soft synthetic resin to have the chemical resistance is loaded in the tank produced from the general steel plate. In addition, Japanese Patent Laid-Open Publication No. 2001-354292, Japanese Utility-Model Laid-Open Publication No. S61-48190, Japanese Patent Laid-Open Publication No. S50-4615, and Japanese Utility-Model Laid-Open Publication No. S57-46492 also disclose to load the inner bag in the tank in order to save the trouble for washing the inside of the tank.
However, with respect to the prior art inner bag to be used in the tanks and tank containers, it is so difficult to produce appropriate inner bags for large tanks including the 20 foot container that there has no practical application. Namely, it has been difficult to produce the inner bag fitting in the cylindrical 20 foot container easily and affordably. The ideal inner bag to fit within the tank container properly would be a cylindrical-shaped inner bag having approximately the same shape as the tank container. However, it is necessary to prepare circular lid films, and in addition, to weld the circular lid films on both ends of a tubular film. To make matters worse, since the circular lid film has to be welded not in a two-dimensional direction, but in a three-dimensional direction, the exclusive guide apparatus for welding the circular lid film is required.
In contrast, an envelope type inner bag is easily produced only by welding the both ends of the tubular film. This type of inner bag prevents the liquid from directly contacting with the inside of the tank by joining supply-discharge openings of the inner bag and the tank. Therefore, changing the inner bag makes it unnecessary to wash the inside of the tank.
However, the following problem occurs in process of developing the above-mentioned inner bag. The inner bag may move during transportation and the movement varies depending on whether the inner bag is in an approximately fully loaded condition where an amount of the cargo reaches the transport tank volume or it is in a non-fully loaded condition. Namely, if the tank is transported in the non-fully loaded condition, the cargo moves in the inner bag, and at the same time, the inner bag moves in the tank. Consequently, the inner bag may be ruptured, the supply-discharge opening may crack, or the cargo may not be discharged due to twist or inversion of the inner bag. Accordingly, some kind of measure has been required.
SUMMARY OF THE INVENTIONAn object of the present invention is to provide a transport tank in which a transport inner bag hardly moves if the transport tank is transported with the transport inner bag which is not fully loaded with a cargo, and a transporting method thereof.
In order to achieve the above object, at least one second inner bag is disposed between a first inner bag containing a cargo and an inner surface of the tank body. The second inner bag will expand by filling of filler for holding the cargo to prevent the first inner bag from moving in said tank body during transportation.
According to the preferred embodiment of the present invention, the first and second inner bags are made from a synthetic resin. The cargo is any of gasses, liquids, and powder and granular materials, which is put into the first inner bag after or while pre-filling the filler in the second inner bag. Although the size of the second inner bag adapts to the amount of the cargo, if the second inner bag has the approximately same size as the tank body, it expands when the cargo is discharged from the first inner bag.
According to the present invention, the second inner bag will expand by the filler to prevent the first inner bag from moving in the tank body during transportation, so that it is possible to settle such drawbacks as the breakage of the first inner bag due to the movement or the discharge failure of the cargo due to twist or inversion of the cargo during the transportation of the first inner bag which is not fully loaded with the cargo. In addition, a specific amount of the filler is preliminarily filled in the second inner bag to arrange the shape of the second inner bag before or while containing the cargo in the first inner bag, so that the folded second inner bag is not sandwiched between the first inner bag and the inner surface of the tank body when the cargo is put into the first inner bag. Therefore, it is possible to prevent the filling failure due to the sandwiched portion at the time of filling the filler in the second inner bag or to prevent the second inner bag from being ruptured.
BRIEF DESCRIPTION OF THE DRAWINGSThe above and other subjects and advantages of the present invention will become apparent from the following detailed description of the preferred embodiments when read in association with the accompanying drawings, which are given by way of illustration only and thus are not limiting the present invention. In the drawings, like reference numerals designate like or corresponding parts throughout the several views, and wherein:
In
A transport inner bag 20 is loaded in a lower portion of the tank body 11, while a pressure inner bag 19 is loaded in an upper portion thereof. These inner bags 19, 20 are brought into the tank body 11 from the hatch 13 by an operating person to set in the tank body 11. The transport inner bag 20 upswells in the tank body 11 by pouring the liquid as cargo therein from the tank supply-discharge opening 15 through the foot valve 16, so that the transport inner bag 20 operates as a lining to the tank body 11. In addition, the pressure inner bag 19 is filled with air supplied through a filling hose 17 and a filler supply-discharge opening 18, and presses the transport inner bag 20 against the tank body 11, thus, the transport inner bag 20 hardly moves during transportation. As the transport inner bag 20 stands still in the tank body 11 against the movement of the liquid in transporting, the transport inner bag 20 is not ruptured.
As shown in
In
The tank body 11 is formed to a tubular shape whose both ends are closed to be placed transversally, while the transport inner bag 20 is formed to the envelope shape. Therefore, if the transport inner bag 20 is smaller than the appropriate size corresponding to the size of the tank body 11, a predetermined filling capacity is not ensured. To make matters worse, the smaller inner bag creates a gap between the inner peripheral surface of the tank body 11 and the transport inner bag 20 where the transport inner bag 20 together with the liquid can move to damage the welded portion of the inner bag supply-discharge opening 22 and the welded lines of the both ends of the transport inner bag 20. Whereas, if the transport inner bag 20 is larger than the appropriate size corresponding to the size of the tank body 11, the raw material of the transport inner bag 20 is wasted. Moreover, if an extra portion such as the end portion of the transport inner bag 20 is under the liquid filled in the transport inner bag 20, the extra portion is sandwiched between the inner bag body 21 filled with the liquid and the peripheral surface of the tank body 11 due to the weight of the liquid. As a result, it becomes impossible to fill liquid furthermore. If the liquid is kept filled while the extra portion is sandwiched, the internal pressure of the transport inner bag 20 rises to possibly damage the transport inner bag 20.
In the present embodiment, the size of the envelope type transport inner bag 20 is limited within a specific range based on the size of the tank body 11 for the purpose of preventing the filling failure and the damage of the transport inner bag 20. When the length of the transport inner bag 20 is IL, the width thereof is IW, the inner peripheral length (first inner peripheral length) of the tank body 11 in the longitudinal cross-sectional surface in the longitudinal direction is TLt, and the inner peripheral length (second inner peripheral length) of the tank body 11 in the longitudinal cross-sectional surface in the width direction is TLr, the following conditions are satisfied:
-
- 0.47 TLt≦IL≦0.6·TLt; and
- 0.47 TLr≦IW≦0.6·TLr.
IL and IW preferably satisfy the following conditions:
-
- 0.49 TLt≦IL≦0.55 TLt; and
- 0.49 TLr≦IW≦0.58 TLr.
As above-mentioned, the size of the transport inner bag 20 is limited based on the inner peripheral length of the tank body 11, so that the tank body 11 may have different shapes than tube such as an elliptical shape or others.
The inner bag supply-discharge opening 22 is provided on the central line extending in the longitudinal direction at a position apart from one end of the transport inner bag 20 by the distance L1=1750 mm or adjacent thereto. The distance L1 is limited within a range 0.44·IW≦L1≦0.50·IW based on the width IW of the transport inner bag 20, so that it is possible to position the central positions in the longitudinal direction of the tank body 11 and the transport inner bag 20 with each other if the transport inner bag 20 is attached to the tank body 11 with reference to the tank supply-discharge opening 15, which is formed in the end of the lower portion of the tank body 11. Thereby, the extra portions in both ends of the transport inner bag 20 can be distributed approximately evenly in the tank body 11. Accordingly, the extra portion of the transport inner bag 20 dose not build up on one side to be sandwiched between the tank body 11 and the inner bag body 21, so that the filling failure and the damage of the transport inner bag 20 are eliminated.
As shown in
As shown in
The hose connection opening 51b uses a snap type connection to hold the end of the hose removably. The valve 50 is closed by rotating a handle 50a at the time of removing the filling hose 17 from the hose connector 51. After removing the filling hose 17, a cap 52 is fitted in the cap attachment screw 51c. Note that a screw type of the hose connection opening may be used instead of the snap type. In addition, with regard to the shape and structure of the filler supply-discharge opening 18, the valve 50 and the hose connector 51 and the attaching method for them, various embodiments may be applied to the present invention. Moreover, the pressure inner bag 19 may be formed in a multilayer structure to have two or more layers.
Next, the procedure for producing the transport inner bag 20, which is shown in
As shown in
As shown in
As shown in
As shown in
As shown FIGS. 10A-C, two stripes of thermal welding lines 35a and 35b of 5 mm in width are formed linearly at an interval of 5-10 mm. Note that one or three or more thermal welding lines may be formed. In addition, a corrugated thermal welding line may be applied to the present embodiment instead of the linear one. If the plural thermal welding lines are formed, all lines may be formed together, or each line may be formed one by one. In
As shown in
As shown in
As shown in
As aforementioned, since the inner bag body 21 is folded such that the inner bag supply-discharge opening 22 is directed outside the inner bag body 21, the inner bag supply-discharge opening 22 can be inserted to the tank supply-discharge opening 15 easily. In addition, the inner bag body 21 is folded inward along the inward folding lines 21g, so that the inner bag body 21 can be expanded easily in the longitudinal direction of the tank body 11 in a state that the inner bag supply-discharge opening 22 is set in the tank supply-discharge opening 15. Furthermore, since the inner bag body 21 is folded inward along each of the inward folding lines 21e and 21f in a state that the inner bag supply-discharge opening 22 is directed downward, the inner bag body 21 is expanded by itself by filling the liquid from the inner bag supply-discharge opening 22.
Although the pressure inner bag 19 is produced by a procedure similar to the transport tank 20, the doubling of the tubular film 23 and the recording of the positioning mark 45 are not required and would be omitted. The filler supply-discharge opening 18 is attached instead of the inner bag supply-discharge opening 22. The filler supply-discharge opening 18 is attached so as to correspond to the position of the hatch 13 of the tank body 11, so that it becomes possible to attach and remove the filling hose 17 and also open and close the valve 50 at the hatch 13.
Next, the method of loading the transport inner bag 20 and the pressure inner bag 19 in the tank body 11 is explained. First, the inner bags 19, 20 in the packaging bag 40 are brought into the tank body 11 by the operating person, and then the transport inner bag 20 is taken out from the packaging bag 40. The positioning mark 45 is recorded linearly on the transport inner bag 20 so as to correspond to the central line CL1 extending in the longitudinal direction of the tank body 11. After the foot valve 16 has been removed from the flange 15a of the tank supply-discharge opening 15, the inner bag supply-discharge opening 22 is inserted in the tank supply-discharge opening 15 so as to conform the positioning mark 45 to the central line CL1. Thereby, the attachment flange 22c is attached firmly to the flange 15a. Second, the inner bag body 21 folded along the inward folding lines 21g is unfolded in the longitudinal direction of the tank body 11, and then the folded portions along the inward folding line 21f are unfolded. Both the side edge portions which are folded along the inward folding lines 21e are not unfolded. Since the approximately overall width of the inside of the tank body 11 is covered by the inner bag body 21 of which the both side edge portions are folded along the inward folding lines 21e, even if the both side edge portions are unfolded, they are folded again by their weight.
Next, the pressure inner bag 19 is lapped over the unfolded transport inner bag 20 to be unfolded in the same manner as the transport inner bag 20. Subsequently, as shown in
The liquid as the cargo is filled from the tank supply-discharge opening 15. The filling speed is 50 liters per minute, for example. The inner bag body 21 is extended in the longitudinal direction in the tank body 11, so that the inner bag body 21 upswells by filling the liquid in the inner bag body 21 smoothly. The both side edge portions of the inner bag body 21, which are folded inward, are gradually unfolded with the filling of the liquid, so that the end portions of the inner bag body 21 are not accidentally caught between the inner bag body 21 and the tank body 11 by the weight of the portion in which the liquid is filled. Therefore, the inner bag body 21 upswells smoothly by the filling of the liquid. In the fully loaded condition, about 20 tons of liquid is contained in the inner bag body 21; however, the present embodiment premises the transportation in the non-fully loaded condition, 10 tons of liquid is contained in the inner bag body 21 for an example of the non-fully loaded conditions.
The air is put up to 10-20% of the filling capacity, for example, in the pressure inner bag 19 before or at the same time as the onset of the liquid filling in the transport inner bag 20. The pre-filling of the pressure inner bag 19 is performed in order to arrange the shape of the pressure inner bag 19 so that the pressure inner bag 19 avoids to be sandwiched between the transport inner bag 20 and the inner surface of the tank body 11 due to the filling of the liquid. The filling of the air is temporarily stopped at the time of reaching the pre-filling amount. After the predetermined transportation amount, 10 tons of liquid for example, has been flowed in the transport inner bag 20, the air is filled again in the pressure inner bag 19. The air is stopped filling after a gap between the inner surface of the tank body 11 and the transport tank 20 has been filled by the air. The filling hose 17 is removed after closing the valve 50, and the cap 52 is placed on the filler supply-discharge opening 18. After that, the hatch 13 is closed, and then the filling operation for the tank body 11 is finished. Note that the air to be preliminarily filled in the pressure inner bag 19 maybe equal to or slightly exceed the capacity which subtracts the predetermined transportation amount from the capacity of the tank body 11 before the liquid filling in the transport inner bag 20. If the air is preliminarily filled in the pressure inner bag 19 to slightly exceed the above-mentioned capacity, the liquid is filled in a state that the valve 50 is slightly open to discharge the extra air in the pressure inner bag 19 while the liquid is filled in the transport inner bag 20. Thereby, it is possible to alleviate or eliminate the air filling operation in the place for the liquid filling. Note that an air vent valve such as a one-way valve may be provided instead of or in addition to the valve 50.
In the present embodiment, the inner bag body 21 is loaded in the tank body 11 to extend in the longitudinal direction, and its side edge portions are folded inward toward the central line extending in the width direction of the inner bag body 21. That prevents the air from entering the inner bag body 21 and the inner bag body 21 can be used for the anaerobic liquid. In addition, since the inner bag body 21 and the inner bag supply-discharge opening 22 are made from LLDPE having high chemical resistance, the tank body 11 has more choices in material. Furthermore, it is unnecessary to line the inner peripheral surface of the tank body 11 with fluorocarbon resin such as polytetrafluoroethylene.
When the inner bag body 21 dwindles to close with the inner bag supply-discharge opening 22 after the remaining amount of the liquid is reduced, the inner bag body 21 may be accidentally sucked into the inner bag supply-discharge opening 22 to cover the opening 22. In order to prevent the inner bag body 21 from covering the inner bag supply-discharge opening 22 in discharging the liquid from the tank supply-discharge opening 15, when the liquid is discharged from the tank supply-discharge opening 15, a passage between the inner bag body 21 and the inner bag supply-discharge opening 22 is ensured by the inner bag suction preventing member 30. The inner bag suction preventing member 30 is integrally constituted of a semi-spherical end 30b arranged to protrude toward the inside of the tank body 11, a tubular portion 30d whose peripheral surface has plural continuous holes 30c, and the attachment flange 30a provided on the base of the tubular portion 30d. The semi-spherical end 30b protrudes toward the inside of the inner bag body 21, so that the residual liquid in the inner bag body 21 can be surely discharged through the continuous holes 30c without the inner bag body 21 stick to the inner bag supply-discharge opening 22.
In the above embodiment, the inner bags 19, 20 are made from LLDPE, they may be made from LDPE (low-density polyethylene), OP (biaxially oriented polypropylene) and other synthetic resin. In addition, although the inner bag body 21 is doubled in the present embodiment, it may have a multilayer or single-layer structure. Moreover, the tank body 11 may have different shapes than tube such as an elliptical shape or others. Furthermore, the inner bags 19, 20 may be used not only for the tank container, but also for a tanker lorry and so forth. The present invention is not limited only to the inner bag having an envelope shape in the above embodiment, but is also applicable to a cylindrical shape or other shapes.
In the above embodiment, although the pressure inner bag 19 has the same size as the transport inner bag 20 capable of carrying 1-19 tons of cargo in the non-fully loaded condition, the pressure inner bags may be provided with, for example, four sizes accommodating to 1-5 tons, 5-10 tons, 10-15 tons and 15-19 tons of cargo in accordance with the transportation amount. Thereby, the pressure inner bag 19 the size of which is unnecessarily large is not required, so that it is possible to prevent the material thereof from being wasted. In addition, not only one pressure inner bag but plural ones may be used in the present invention. In this case, plural filling hoses are connected to each inner pressure bag 19 when the liquid as the cargo is filled.
The pressure inner bag 19 and the transport inner bag 20 may be folded together in a state that the pressure inner bag 19 is lapped over the transport inner bag 20 not as loading these inner bags separately. Thereby, the folding and the loading of the inner bag can be performed at a time, so that the operation time is reduced in comparison with the case in which these operations are performed separately. When folding together, the portions of these inner bags may be temporally attached each other by a two-sided adhesive tape.
The air is used as the filler in the above embodiment; however, gas emission from a track engine or inert gas such as nitrogen gas may be used. In addition, the air may be filled by connecting a cartridge directly instead of using the filling hose. Moreover, not only gasses but also liquids such as water or powder and granular materials made of a synthetic resin foam may be used as the filler. Furthermore, the cargo is not limited to only the liquids, but powdery or granular cargo may be applied to the present embodiment.
Note that the back pressure may be applied to the cargo by expanding the pressure inner bag, which has the approximately same capacity as the tank body, when the cargo is discharged from the tank body. Thereby, the cargo having high viscosity can be discharged smoothly and rapidly.
Although the present invention has been fully described by the way of the preferred embodiments thereof with reference to the accompanying drawings, various changes and modifications will be apparent to those having skill in this field. Therefore, unless otherwise these changes and modifications depart from the scope of the present invention, they should be construed as included therein.
Claims
1. A transport tank having a tank body and a first inner bag to be loaded inside of said tank body removably, said first inner bag having a second supply-discharge opening to be fitted in a first supply-discharge opening of said tank body for loading a cargo, said transport tank comprising:
- at least one second inner bag, disposed between said first inner bag containing said cargo and an inner surface of said tank body, to expand by filling of filler for holding said cargo to prevent said first inner bag from moving in said tank body during transportation.
2. A transport tank as claimed in claim 1, wherein said first and second inner bags are made from a synthetic resin.
3. A transport tank as claimed in claim 2, wherein said cargo is put into said first inner bag after or while pre-filling said filler in said second inner bag.
4. A transport tank as claimed in claim 3, wherein size of said second inner bag adapts to an amount of said cargo.
5. A transport tank as claimed in claim 3, wherein said second inner bag has the same capacity as said tank body and expands when said cargo is discharged from said first inner bag.
6. A transport tank as claimed in claim 5, wherein said filler is any of gasses, liquids or powder and granular materials.
7. A transporting method for transporting cargo by use of a first inner bag to be loaded inside of a tank body removably, said first inner bag having a second supply-discharge opening to be fitted in a first supply-discharge opening of said tank body for loading said cargo, said transporting method comprising the step of:
- expanding at least one second inner bag, which is disposed between said first inner bag containing said cargo and an inner surface of said tank body, by filling of filler for holding said cargo to prevent said first inner bag from moving in said tank body during transportation.
8. A transporting method as claimed in claim 7, wherein said first and second inner bags are made from a synthetic resin.
9. A transporting method as claimed in claim 8, wherein said cargo is put into said first inner bag after or while pre-filling said filler in said second inner bag.
10. A transporting method as claimed in claim 9, wherein size of said second inner bag adapts to an amount of said cargo.
11. A transporting method as claimed in claim 9, wherein said second inner bag has the same capacity as said tank body and expands when said cargo is discharged from said first inner bag.
12. A transporting method as claimed in claim 11, wherein said filler is any of gasses, liquids or powder and granular materials.
Type: Application
Filed: Feb 25, 2005
Publication Date: Sep 1, 2005
Applicant:
Inventor: Yoshitsugu Moizumi (Shizuoka)
Application Number: 11/066,196