JP2002356194A - Powder transport ship - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a powder transport ship having a bottom structure capable of extracting powder filled in a hold without remaining and keeping the effective volume large. SOLUTION: This powder transport ship 10 has inclined parts 13, 14 toward the center of the bottom 12. The inclined parts 13, 14 blow off compressed air 17 from the bottom of the ventilation sheets 15, 16 to secure flowability of the powder 18. Air jet nozzles 21, 21a for blowing off compressed air 20 toward the flowing direction of the powder 18 are provided in upper positions of the inclined parts 13, 14.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a powder carrier for filling and transporting powder such as powder cement into a hold and extracting the powder from the hold.

[0002]

2. Description of the Related Art Conventionally, a powder transport ship 70 as shown in FIG. 7 has been known as a ship for filling and transporting powder cement as an example of powder. The powder transport ship 70 has a structure in which powder cement 71 is fully loaded in the hold 72 as it is, poured into a chain conveyor 73 provided at the center at the time of unloading, and transported outside by a bucket conveyor (not shown). As shown in the figure, the ship bottom 74 has a substantially planar shape, and the cement does not flow into the chain conveyor 73 at the center as it is, so that the powder cement 71 flows into the chain conveyor 73 as shown in FIGS. A ship bottom structure 80 shown in FIG. 9 is provided.

In a ship bottom structure 80 shown in FIGS. 8 and 9, a slightly inclined slide body 75 (normally at an inclination angle of 8 degrees or more) is provided at a central portion, and an inclined portion 7 made of a steel plate is provided on both sides thereof.
6 and 77 are arranged, and the powder cement 71 placed on the upper portion is guided from the inclined portions 76 and 77 to the slide body 75 and is guided to the chain conveyor 73. The slide body 75 includes a box 78 having an open top, and a cloth material 79 which is an example of a ventilation sheet disposed on the top of the box 78. Introduce compressed air,
The structure is such that compressed air is discharged from the upper cloth material 79 to move the powder cement 71 from the upper part to the lower part of the slide body 75 while floating. However, in the bottom structure 80 of the powder transport ship 70, since the inclined portions 76 and 77 are formed of steel plates, it is necessary to take the angle to 60 degrees or more in relation to the angle of repose of the powder cement 71. A large space 81 having a substantially triangular cross-section is formed below 76 and 77, which causes a problem that the effective volume of the hold 72 is reduced.

In order to solve this problem, a powder transport ship having a ship bottom structure 90 shown in FIGS. 10 and 11 is disclosed in Japanese Utility Model Laid-Open No. 63-104195. In the ship bottom structure 90, a center slide body 91 corresponding to the slide body 75 of the ship bottom structure 80 of the powder transport ship 70 is provided on both sides of the center slide body 91, and furthermore, it has a slide body structure and is slightly inclined. (About 8 degrees). That is, the side slide bodies 92 and 93 are obtained by replacing the steel plate structures of the inclined portions 76 and 77 of the bottom structure 80 of the powder transport ship 70. In FIGS. 10 and 11, reference numeral 94 denotes a cloth material attached to the upper portion of the box, reference numeral 95 denotes an air intake, reference numeral 96 denotes a gate, and reference numeral 97 denotes an auxiliary rib of a hold. I have.

[0005]

However, the powder transport ship having the above-mentioned ship bottom structure 90 still has the following problems to be solved. Side slide body 92,
The compressed air for flow is taken in from the air inlet 95 of 93, and is discharged from the upper cloth material 94, so that the powder cement 71 on the cloth material 94 is raised, and the powder cement 71 is removed from the side slide bodies 92, 93. Although it can be gradually moved downward while being moved to the center slide body 91, since the cross-sectional shape of the joint portion 98 of the adjacent side slide bodies 92 and 93 is mountain-shaped, powder is added to this part. There is a problem that the cement 71 remains and the scraping operation must be performed manually.

The present invention has been made in view of such circumstances, and a powder transport ship having a ship bottom structure capable of extracting powder filled in a hold without remaining, and maintaining a large effective volume. The purpose is to provide.

[0007]

According to a first aspect of the present invention, there is provided a powder carrier having an inclined portion toward a center of a bottom, and the inclined portion blows compressed air from the bottom of the ventilation sheet to supply powder. BACKGROUND ART In a powder transport ship ensuring fluidity of a body, an air ejection nozzle for blowing compressed air in a direction in which powder flows in a position above an inclined portion is provided. As a result, the bottom can be formed in a flat shape, and compressed air can be blown to the powder laid on the flat ventilation sheet to break the powder and completely extract the powder.

According to a second aspect of the present invention, there is provided a powder transporting ship including a plurality of powder distribution portions having a trapezoidal cross section toward the center of the bottom, each of the powder distribution portions including a ventilation sheet at the center, and both sides. In a powder transport ship provided with an inclined surface portion, an air ejection nozzle for promoting the flow of powder passing through the powder flowing portion is provided at a position above at least one inclined surface portion of each powder flowing portion. ing. Thereby, the inclination of the inclined surface portion can be formed to be small, and the compressed air can be blown out to the powder that has occupied the inclined surface portion to break the powder and completely extract the powder. In the powder transport ship according to the first and second inventions,
The compressed air blown out from the air blowing nozzle and the compressed air blown out from the bottom of the ventilation sheet may be configured to be from the same supply source. As a result, the air compressor and other pneumatic devices can be partially used.

[0009]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, embodiments of the present invention will be described with reference to the accompanying drawings to provide an understanding of the present invention. Here, FIG. 1 is a sectional view of a powder transport ship according to a first embodiment of the present invention, FIG. 2 is a partial plan view of a hold of the powder transport ship, and FIG. FIG. 4 is a partial plan view of the bottom of a hold of a powder transport ship according to a second embodiment of the present invention, and FIG. 5 is a view taken along the line AA in FIG. FIG. 6 is a cross-sectional view, and FIG. 6 is an explanatory diagram of a compressed air piping system and an air jet nozzle of a powder transport ship according to a second embodiment of the present invention.

As shown in FIGS. 1 and 2, the first embodiment of the present invention
The powder transport boat 10 according to the embodiment has inclined portions 13 and 14 toward a bottom center (powder introduction path) 12 in a hold 11, and the inclined portions 13 and 14 are an example of a ventilation sheet. The cloth materials 15, 16 are provided, and compressed air 17 for flowing is blown out from the bottoms of the cloth materials 15, 16 to powder cement 18, which is an example of powder on the cloth materials 15, 16, to improve the fluidity of the powder cement 18. It has a secured bottom structure. Hereinafter, these will be described in detail. Note that the width direction of the boat is the X direction, the longitudinal direction of the boat is the Y direction, and the height direction is the Z direction.

In consideration of the structure, manufacture and installation of the hold 11, the inclined portions 13 and 14 are formed by arranging a plurality of rectangular divided slide bodies having a predetermined width adjacent to each other in the longitudinal direction of the ship. The upper surfaces 19 of the inclined portions 13 and 14 are formed in a planar shape. That is, the inclined portion 13 (same for 14) is a flat plate unlike the conventional bottom structure 90 of the powder transport ship in which the side slides 92 and 93 are arranged to be inclined to the center slide 91. It is a structure formed in a shape. The inclination angle α of the upper surface 19 of the inclined portion 13 (hereinafter, the same applies to the inclined portion 14) with respect to the horizontal is approximately 8 degrees. Each of the divided slide bodies is a bottom structure 80 of a conventional powder transport ship 70.
Has the same structure as the slide body 75 (see FIGS. 8 and 9). That is, the divided slide body includes a box body whose upper part is open, and a divided cloth material arranged at the upper part of the box body, and the compressed air 17 for flow is introduced into the lower part of the box body. The compressed air 17 is discharged from the cloth material (the cloth material 15 is divided) to float the powder cement 18. The compressed air for flow 17
Is connected to an air inlet (see FIG. 1) of each of the divided slide bodies by a flow air compressor (not shown), a compressed air pipe, an on-off valve, and the like.
Bottom structure 90 of the conventional powder transport ship shown in FIG.
From the air intake 95).

As shown in FIG. 1 and FIG.
At the upper position (same for 14), a plurality (six in the present embodiment) of air jet nozzles 21 and 21a for blowing compressed air 20 for transfer toward the bottom center 12 where the powder cement 18 flows down are provided. A plurality of air pipes 22 (23) attached at a predetermined pitch are provided (six in FIG. 2). The air pipe 23 is different from the air pipe 22, and the air jet nozzle 21 a is connected to the air pipe 2.
2, 23 are provided at the tip (bottom center 12 side).

FIG. 3 shows an air pipe 22 and an air jet nozzle 2.
1 and 21a are shown in detail. The air pipe 22 is an example.
The length L is 3500 mm and is made of STPG (carbon steel pipe for pressure piping) 50A (sch80). As shown in the enlarged view, the air ejection nozzle 21 is attached so as to maintain an inclination angle β of 60 degrees with respect to the longitudinal direction (X direction) of the air pipe 22. The air jet nozzle 21a is connected to the air pipe 22
Is mounted near the blind plate 24 provided at the tip of the nozzle, and the inclination angle β is maintained at 60 degrees similarly to the air jet nozzle 21. More specifically, the air ejection nozzle 21 is formed of a (3/4) inch high pressure socket, while the air ejection nozzle 21a is formed of a 1 inch high pressure socket.

As shown in FIGS. 1 and 2, the base ends of the six air pipes 22, 23 are communicated with air header pipes 25, 26 arranged at both ends of the bottom in the hold 11.
The air header pipes 25 and 26 respectively branch from a compressed air source pipe 27 connected to a transfer air compressor (not shown), and have distal ends of branch air pipes 30 and 31 provided with on-off valves 28 and 29 on the way. It is connected to the. The branch air pipes 30 and 31 are also provided with air ejection nozzles 21 at a predetermined pitch in the up and down direction.

Accordingly, the compressed air 20 generated by the transfer air compressor is supplied to the compressed air source pipe 27, the on-off valve 28,
9, branch air pipes 30 and 31, air header pipe 25,
The powder cement 18 can be completely discharged to the bottom center 12 by discharging the fluidized powder cement 18 through the air jet nozzles 21 and 21a attached to the air pipes 26 and the air pipes 22 and 23. As shown in FIG. 2, the powdered cement 18 transferred to the bottom center 12
Is transported to a predetermined discharge location by a transport conveyor 32 that transports the powder cement 18 in the longitudinal direction (Y direction) of the ship.

Next, the operation of extracting and transporting the powder cement 18 using the powder transport ship 10 according to the first embodiment of the present invention will be described. It is assumed that the inside of the hold 11 of the powder transport ship 10 starts from an empty state. (1) At the loading location of the powder cement 18, the pneumatic transportation or other method is used to hold the cargo hold 11 of the powder transport ship 10.
Is filled with powdered cement 18. (2) Move the powder transport ship 10 to a predetermined transport location. (3) Operate or operate the transport conveyor 32 and handling means for landing the powder cement 18 transported from the transport conveyor 32.

(4) The air compressor for flow is driven to supply compressed air 17 to each of the divided slides constituting the inclined portions 13 and 14, and the powder cement 18 on the inclined portions 13 and 14 is supplied.
And the compressed air 20 is driven by the air compressor for transfer to drive the compressed air 20 from the air jet nozzles 21, 21 a provided in the air header pipes 25, 26 and the air pipes 22, 23 to the fluidized powder cement 18. Discharge. (5) By continuously performing the above (3) and (4), the powder cement 18 filled in the hold 11 is gradually discharged to the bottom center 12. Even if the inclination angle α of the upper surface 19 of the inclined portions 13 and 14 with respect to the horizontal is 8 degrees and the upper surface 19 is planar, the air ejection nozzles 21
a of the inclined portions 13 and 1
4 without the powder cement 18 remaining on the upper surface 19,
The powder cement 18 is completely extracted. (6) When the inside of the hold 11 becomes empty and the above-mentioned unloading operation is completed, the powder transport boat 10 is moved to the loading place again.

A powder transport ship according to a second embodiment of the present invention has a bottom structure 40 shown in FIGS.
As shown in FIGS. 4 and 5, in the bottom structure 40 of the powder transport ship, a powder flow portion 42 (showing the starboard side) having an inverted trapezoidal cross section toward the bottom center (powder introduction path) 41. A plurality of powder distribution sections 42 are provided with a cloth material 43, which is an example of a ventilation sheet, at the center.
45 are provided adjacent to each other. Hereinafter, these will be described in detail.

The cloth material 43 formed in a long rectangular shape is similar to the bottom structure 80 of the conventional powder transport ship 70 (see FIGS. 8 and 9), and has a powder trapping section having an inverted trapezoidal cross section. At the center of the slide 42, a slide 46 is provided which is slightly inclined toward the bottom center 41 (see FIG. 1, the inclination angle α is 8 degrees or more). The slide body 46 is provided with a box 47 having an open top and a long rectangular shape, and a cloth material 43 disposed on the top of the box 47. Of compressed air 17 from the upper cloth material 43
7, the powder cement 18 is moved from the upstream side to the downstream side of the powder flowing portion 42 of the slide body 46 while the powder cement 18 is raised. On both sides of the slide body 46, inclined surface portions 44 and 45 formed in a long rectangular shape adjacent to each other and mainly made of a steel plate are arranged at an inclination angle θ (normally 10 degrees to 30 degrees).

As shown in FIGS. 4 (indicated by a two-dot chain line), FIGS. 5 and 6, the powder passing through the powder flowing portion 42 is located above the inclined surface portion 44 on one side of each powder flowing portion 42. Plurality that promotes the flow of cement 18 (in the present embodiment,
A plurality of (four in FIG. 6) air pipes 49 having six (6) air ejection nozzles 48 and 48a attached at a predetermined pitch are provided in each air header pipe 50. Air piping 4
9 is substantially the same as the air pipe 22. The air ejection nozzles 48 and 48a are connected to the air ejection nozzles 21 and 21a.
However, the compressed air 20 is ejected from the air ejection nozzles 48 and 48a in such a manner that the ejection direction of the compressed air 20 is orthogonal to the longitudinal direction (X direction) of the air pipe 49.

FIG. 6 shows a piping system diagram of the compressed air 20. The base ends of the four air pipes 49 are communicated with a plurality of air header pipes 50 (showing the starboard side) arranged at both ends in the width direction (X direction) of the bottom in the hold 11. Each of the header pipes 50 is connected to the main pipe 5 through a connecting pipe 51.
2 are connected. The main pipe 52 is connected to a transfer air compressor (not shown) via a required pneumatic device. In order to prevent the powder cement 18 from remaining, the required number of air ejection nozzles 48 are attached to the air header tube 50 in a predetermined injection direction and at predetermined positions. In addition, the code | symbol 51a in FIG. 6 shows the communication pipe arrange | positioned at the port side, the code | symbol 53 represents the butterfly valve for operation, and the code | symbol 54 represents a pressure gauge.

Accordingly, in the powder transport ship according to the second embodiment having the ship bottom structure 40, the air jet nozzle 4
Compressed air can also be ejected to the remaining powder cement 18 at the bottom and corners and transferred to the slide body 46 via the sliding surfaces 46 and 8, so that the inclined surfaces 44, 4
5 can be made smaller than the inclined portion of the conventional powder transport ship, whereby the effective volume of the hold 11 can be increased.

In the powder transport ship 10 of the first embodiment, the air pipes 22 and 23 are provided with the air jet nozzles 21 and 21a, respectively. However, the present invention is not limited to this. When the width of the hold is narrow), air piping 2
Air header tube 2 directly without using 2, 23
The air jet nozzles may be provided in the air pipes 5 and 26 or in a plurality of air header pipes in one, with the jet direction directed toward the bottom center (powder introduction path) 12 and in a required number. . Further, in the powder transport ship of the first and second embodiments, six air ejection nozzles are provided in each of the air pipes. However, the present invention is not limited to this, and the number may be appropriately determined as necessary. Can be.

When discharging the powder cement 18 filled in the hold, compressed air for flow and compressed air for transfer are jetted from the beginning, but the timing of jetting each compressed air may be adjusted according to the situation. It can also be adjusted. Inclined part 1
3, 14 are configured by arranging divided slide bodies having a predetermined width in the longitudinal direction (Y direction) of the ship, but are not limited thereto, and may be configured to be arranged in the width direction of the ship (X direction) according to circumstances. You can also. Although the inclined surfaces 44 and 45 are made of steel plate, the present invention is not limited to this, and other materials may be used in consideration of the coefficient of friction, strength, and the like. The compressed air for flow and the compressed air for transfer are generated by separate air compressors, but are not limited thereto, and may be generated by one air compressor and from the same source. . For example, if there is room for the air volume of the air compressor for flow, it is not necessary to newly provide a transfer air compressor. The case where the powder cement 18 is used as the powder (powder cargo) has been described. However, the present invention is not limited thereto.
Ash dust, fly ash, calcium carbonate, slag powder, alumina powder and the like can also be used.

In the bottom structure 40 of the powder transport ship according to the second embodiment, the air pipe 49 is provided above the inclined surface portion 44, but is not limited thereto.
An air pipe may be provided above the air pipe 5 so as to face the air pipe 49. Further, an air pipe 49 may be provided above the inclined surface section 44, and an air pipe may be provided above the inclined surface section 45 so as to face the air pipe 49.
Although a cloth material was used as the ventilation sheet, it is not limited to this,
Other structures may be used.

[0026]

According to the first and third aspects of the present invention, the bottom can be formed flat, and compressed air is blown to the powder laid on the flat ventilation sheet. The powder can be broken down and the powder can be completely extracted, so that the effective volume of powder in the hold can be increased, thereby improving transport efficiency and eliminating manual scraping work. be able to. In the powder transport ship according to claim 2 and dependent claim 3,
The slope of the slope can be made small, and compressed air can be blown out of the powder that has occupied the slope to break up the powder and completely extract the powder. Can increase the effective volume of powder inside,
As a result, the transport efficiency is improved, and the scraping operation by human power can be eliminated. Further, the amount of compressed air for flow can be reduced. In particular, in the powder transport ship according to the third aspect, the air compressor and other pneumatic equipment can be partially used, so that the existing air compressor and other pneumatic equipment can be used or newly added. Even if it is installed, it can be manufactured at low cost.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view of a powder transport ship according to a first embodiment of the present invention.

FIG. 2 is a partial plan view of a hold of the powder transport ship.

FIG. 3 is an explanatory view of the attachment of an air pipe and an air ejection nozzle used in the powder transport ship.

FIG. 4 is a partial plan view of a bottom part of a hold of a powder transport ship according to a second embodiment of the present invention.

FIG. 5 is a sectional view taken along line AA of FIG. 4;

FIG. 6 is an explanatory diagram of a compressed air piping system and an installation of an air ejection nozzle of a powder transport ship according to a second embodiment of the present invention.

FIG. 7 is a sectional view of a powder transport ship according to a first conventional example.

FIG. 8 is a partial plan view of a hold bottom of the powder transport ship.

FIG. 9 is a sectional view taken along the line BB of FIG. 8;

FIG. 10 is a partial plan view of a hold bottom of a powder transport ship according to a second conventional example.

FIG. 11 is a partial perspective view of a hold bottom of the powder transport ship.

[Explanation of symbols]

10: powder transport ship, 11: hold, 12: bottom center (powder introduction path), 13, 14: inclined portion, 15, 16: cloth material (ventilated sheet), 17: compressed air, 18: powder cement ( 19) upper surface, 20: compressed air, 21, 21a: air jet nozzle, 22, 23: air piping, 24: blind plate, 2
5, 26: air header pipe, 27: compressed air source pipe, 2
8, 29: open / close valve, 30, 31: branch air pipe, 32:
Transport conveyor, 40: ship bottom structure, 41: bottom center (powder introduction path), 42: powder distribution section, 43: cloth material (ventilating sheet), 44, 45: inclined surface section, 46: slide body, 4
7: box, 48, 48a: air jet nozzle, 49: air pipe, 50: air header pipe, 51, 51a: connecting pipe,
52: Main pipe, 53: Butterfly valve for operation, 54: Pressure gauge

Claims (3)

[Claims] 1. A powder transport ship having a slope toward a center of a bottom, wherein the slope is formed by blowing compressed air from a bottom of a ventilation sheet to ensure fluidity of powder. An air ejection nozzle for ejecting compressed air in an upper position in a direction in which the powder flows is provided. 2. A powder transport ship comprising a plurality of powder distribution portions having an inverted trapezoidal cross section toward the center of the bottom, wherein each of the powder distribution portions is provided with a ventilation sheet at the center, and inclined surfaces on both sides. A powder transport ship, wherein an air ejection nozzle for promoting the flow of powder passing through the powder distribution section is provided at a position above at least one inclined surface of each of the powder distribution sections. 3. The powder transport ship according to claim 1, wherein the compressed air blown from the air jet nozzle and the compressed air blown from the bottom of the ventilation sheet are from the same supply source. Powder transport ship.