JPH10101181A - Discharge of powdery particles from flexible container - Google Patents

Abstract

PROBLEM TO BE SOLVED: To simply and rapidly discharge powdery particles having a sphere corresponding diameter larger than 1mm from a flexible container at low cost. SOLUTION: In a method for discharging powdery particles from a foldable container 1 having a flexible outer bag 4 having airtightness and the air permeable flexible inner bag 5 housed in the outer bag 4 through discharge piping 9 by sending air through the bottom surface of the inner bag 5 from below to above in order to slide the powdery particles housed in the inner bag 5 by air, the air permeability of the air slide part 6 of the container 1 is set to 0.15-10cc/cm<2> /s and the pressure loss of air passing through the air slide part 6 is made larger than the pressure due to the wt. of powdery particles applied to the air slide part 6 to discharge the powdery particles.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for discharging a granular material from a collapsible container for storing the granular material and the like therein and transferring the granular material to a destination.

[0002]

2. Description of the Related Art Conventionally, general methods of transporting granular materials include a method using a tank lorry and a method using a flexible container.

[0003] Here, the former method using a tank lorry is a method in which a granular material is stored in a rigid tank attached to a car bed or a discharge position or a filling position of a granular material in an empty tank. The purpose is to fill the inside of the tank with the granular material at each position and to discharge the granular material. According to this method, the tank, which is a pressure vessel, has rigidity and the shape of the tank is always kept constant, so that the discharge of the powder and granules in the tank can be performed by air pressure feeding. From this, the method using a tank truck is
There is an advantage that the filling and discharging of the powder can be performed simply and quickly. However, in such a method, since the rigid tank is used, the rigid tank occupies the cargo bed of the automobile, and the return route after completing the transportation of the granular material runs with an empty load, and the transportation efficiency is reduced. It has a problem that it is extremely bad.

In the latter method using a flexible container, the container can be folded and returned after the end of the transportation of the granular material, whereby the car carrier can be emptied, and another baggage can be loaded on the empty car carrier. There is a transportation advantage that you can return home. In order to take advantage of this advantage, a method of transporting granular materials using a flexible container is adopted.However, in this method, contrary to the method using a tank lorry, the granular materials stored in the container can be easily and quickly transferred. There is a problem in discharging.

That is, in the case of a rigid container, the entire container is tilted, whereby the contents can be discharged from the container. However, in the case of a flexible container, the container itself is lifted because it is not rigid. You can't tilt. For this reason, when using a flexible container, several proposals have been made to simply and quickly discharge the contents in the container.

For example, Japanese Patent Application Laid-Open No. 4-102578 discloses that an air slide chamber is provided between an outer bag and an inner bag on the lower surface of a flexible container having a double structure of an outer bag and an inner bag to disperse powder. Emission methods have been proposed. In this method, air is blown into the container from the air slide chamber through the inner bag to fluidize the powder, the outer bag is inflated by air leaking from the air-permeable inner bag, and the flexible container is further expanded by 5 ° to 10 °. ° to tilt and discharge the contents.

However, in this method, if the powder has a small particle size, a small amount of air is required to fluidize the powder, but a powder having large particles (specifically, individual powder particles) is required. When the volume of the body is converted into the volume of a sphere, and the equivalent diameter of the sphere becomes larger than 1 mm), a large amount of air is required to fluidize the powder at the time of discharge. However, when a large amount of air is blown into the container through the inner bag of the air slide portion, the pressure loss of the inner bag becomes extremely large. Usually, the air permeability of the inner bag of the air slide part of the flexible container is 0.01 to 0.1 cc / c.
m ² / s (measured with a differential pressure of 125 Pa). With this air permeability, it is necessary to select a blower having a very high static pressure and a large amount of air to be blown. However, lightweight and small, high-capacity blowers suitable for flexible containers that can be loaded into automobiles are expensive, and there is actually no blower worth the cost,
There is a problem that it is not possible to substantially discharge powder having a large particle diameter.

[0008]

SUMMARY OF THE INVENTION In view of the above-mentioned problems, an object of the present invention is to provide a simple and easy method for discharging a powdery or granular material from a flexible container, even when discharging a content larger than a spherical equivalent diameter of 1 mm. It is an object of the present invention to provide a discharge method capable of discharging powder particles promptly and reducing the amount of air used.

[0009]

According to the present invention, there is provided an airtight flexible outer bag, and a breathable and flexible inner bag housed inside the outer bag. Foldable for sending air upward from below the bottom of the inner bag in order to air-slide the powder stored in the inner bag on the bottom surface and discharging the powder from the discharge pipe. In the method of discharging powdery and granular materials from a container, the air permeability of the inner bag of the air slide portion of the container is set to 0.15 to 10 cc / cm ² / s, and the air passing through the inner bag of the air slide portion is A method for discharging a granular material from a flexible container is provided, wherein the granular material is discharged with a pressure loss greater than a pressure due to the weight of the granular material suspended on the inner bag.

[0010]

Embodiments of the present invention will be described below in detail with reference to the drawings. FIG. 1 is a schematic side view illustrating a flexible container according to the present invention, and shows a state in which charging of powder and granules has been completed together with air. And transported to the destination. In the figure, reference numeral 1 denotes a flexible container, 2 denotes an automobile body, and 3 denotes a car carrier. The flexible container is loaded on the carrier 3 of the car body 2 and transferred.

FIGS. 2 and 3 are a side view and a front view, respectively, of the flexible container according to the present invention, illustrating a state in which the granular material is housed inside the flexible container. FIG. It is a side view for explaining the state of. However, the storage items such as powders and granules are not shown in the figure. In addition, in these figures, the outline of the flexible container into which the granular material has been injected is shown as a straight line or a perfect circle. Has become.

In these figures, a flexible container 1 includes at least an outer bag 4, an inner bag 5, an air chamber 7, an inlet 8, a discharge pipe 9, a discharge valve 10, and an air injection pipe 11. As described above, the container 1 is placed on the carrier 3 of the vehicle 2 shown in FIG.

In the flexible container 1 configured as described above, the basic shape of the outer bag 4 is cylindrical,
An inner bag 5 (indicated by a dotted line in the figure) is housed inside the outer bag 4, and the outer bag 4 and the inner bag 5 are mutually fused at a portion indicated by S in the axial direction of the cylinder by high frequency welding or the like. Secured by means. Further, the inner bag lower surface 6 of the flexible container will be referred to as an air slide portion.

In the present invention, since the sphere equivalent diameter is larger than 1 mm, the air permeability of the air slide portion 6 is 0.15 to 10 cc / cm when the differential pressure is measured at 125 Pa. It is important to keep ² / s. Hereinafter, when the air permeability is referred to, the amount of air leaking from the high pressure side to the low pressure side when the differential pressure is measured at 125 Pa (cc
/ cm ² / s).

The reason for this is that the air slide portion 6 has a spherical equivalent diameter of the granular material stored in the flexible container 1 of 1.
If it is larger than mm, a large amount of air is required. In other words, in the inner bag used for a normal flexible container, the air permeability is as small as 0.01 to 0.1 cc / cm ² / s. The pressure loss of the air when passing through is too large, and it is necessary to generate a large pressure in order to feed a large amount of air. However, it has already been mentioned that there is no blower suitable for a flexible container which is small and lightweight suitable for such an application. Therefore, air permeability that does not require a large pressure, specifically, 0.15 to 10 cc / cm ² / s is required.

As the inner bag 5 or the outer bag 4, a woven fabric, a non-woven fabric, a film, or a combination of these materials may be used. That is, a flexible material may be selectively used as appropriate according to the items to be stored in the inner bag 5. If necessary, these materials may be subjected to resin impregnation, resin coating, or the like, and may be subjected to chemical or physical processing such as flameproofing, water resistance, and antibacterial. in short,
An air-tight flexible outer bag 4 and an air-permeable and flexible inner bag 5 housed inside the outer bag 4 are provided.
It is important that the inner bag is stored without leaking, and that the inner bag has a foldable container having an air permeability of 0.15 to 10 cc / cm ² / s.

In the flexible container 1 described above, when air generated by a blower (not shown) is injected from the air injection pipe 11 into the air chamber 7 ', the injected air flows from the air slide portion 6 having air permeability. It leaks out and flows into the inside of the container 1, thereby inflating the outer bag 4 outward. When the internal pressure of the flexible container 1 becomes equal to or higher than a predetermined pressure, the inner bag 5 fixed to the outer bag 4 at the fixing point S is lifted upward.
Form a cylindrical shape. At this time, the air chamber 7 is formed at the same time, and the side wall of the inner bag 5 has a V-shaped slope as shown in FIG. Here, as shown in FIG. 3, the angle θ of the inclined surface of the air chamber 7 is equal to or greater than the angle of repose so that the granular material easily slides down toward the air slide portion 6. It is necessary to keep it.

That is, as shown in FIG. 4, one end of the flexible container 1 is lifted by the air jack 12, air is sent to the air chamber 7 ', and the air is blown from the air slide portion 6 toward the granular material. As a result, the granular material is fluidized and discharged from the discharge pipe 9. At this time, the inside of the flexible container 1 is also filled with air, and the flexible container 1 is inclined (the inclination angle θ1 = 1).
(About 5 °). It is necessary to maintain the inclination angle of the flexible container 1 at a certain angle or more so that the air chambers 7 and 7 'and the flexible container 1 are not crushed. Therefore, the internal pressure of the flexible container 1 is maintained at a certain value or more. It is necessary to keep it.

At this time, in order to prevent the air chambers 7 and 7 'from being crushed, the pressure loss on the lower surface of the inner bag of the air slide portion 6 is set to be larger than the pressure due to the weight of the granular material suspended on the lower surface of the inner bag. That is important. Therefore, the pressure in the air chamber 7 ′ is not crushed by the weight of the granular material,
It is essential that the pressure loss during the passage of the air from the air slide section 6 be larger than the pressure of the granular material suspended on the air slide section 6.

The above description relates to the case where the powder is discharged from the flexible container 1.
The granules are sent into the inner bag 5 together with the compressed air from the inlet 8.
At this time, as shown in FIG.
First, one end of the container 1 is lifted by the air jack 12 in preparation for tilting the container 1 (about θ1 = 15 °).
Thereafter, air is sent to the air chamber 7 ', and the air is blown from the air slide portion 6 into the container 1, thereby fluidizing the charged powder and granular material, and the powder and granular material is uniformly introduced into the container 1. It is necessary to be input.

The flexible container 1 of the present invention can release the air in the flexible container 1 and fold the flexible container 1 when the discharge of the granular material stored in the inner bag 5 is completed. Therefore, unlike the conventional rigid container, the return path after the transfer of the granular material to the destination is such that the flexible container can be folded and the luggage can be loaded in the empty space without emptying the car carrier. Become.

[0022]

As described above, according to the present invention,
Since the discharge of the contents from the flexible container can be performed quickly and easily, and in discharging the contents, a blower having a relatively low performance may be used, and a light and small one can be used. An extremely remarkable effect of reducing equipment costs and running costs is achieved.

[Brief description of the drawings]

FIG. 1 is a side view schematically illustrating a case where a granular material is housed in a flexible container according to the present invention and mounted on a truck bed.

FIG. 2 is a front view schematically illustrating the flexible container of FIG. 1;

FIG. 3 is a schematic side view illustrating the flexible container of FIG. 1 in detail.

FIG. 4 is a schematic side view illustrating in detail a case in which the granular material is charged into the flexible container of the present invention and a case in which the granular material is discharged from the container.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Flexible container main body 2 Automobile 3 Automobile carrier 4 Outer bag 5 Inner bag 6 Air slide part 7 Air chamber 8 Input port 9 Discharge pipe 10 Discharge valve 11 Air injection pipe 12 Air jack S Fixing point of inner bag and outer bag θ, θ1 Tilt angle

Claims (1)

[Claims] 1. An airtight flexible outer bag, and a breathable and flexible inner bag housed inside the outer bag,
In order to air-slide the powders and granules contained in the inner bag on the bottom surface, air is sent upward from the bottom of the inner bag upward, and the powders and granules are discharged from a collapsible container which is discharged from a discharge pipe. In the method for discharging powdery and granular materials, the air permeability of the inner bag of the air slide portion of the container is set to 0.15.
10 to 10 cc / cm ² / s, and the pressure loss of the air passing through the inner bag of the air slide portion is made larger than the pressure due to the weight of the powder material suspended on the inner bag, and the powder is discharged. The method of discharging powders from a flexible container.