JP2000128350A - Powdery material transport device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a powdery material transport device capable of reducing a facility cost and smoothly and easily carrying out a powdery material transport. SOLUTION: A powder force feeding device 24 and a distribution tank 22 are connected to each other through a powder force feeding pipe 25, a powder transport channel is formed by respectively connecting head parts of a plural number of air chutes 27-34 base parts of which are respectively connected to the distribution tank 22 to a plurality of powder reservoir parts 13-20 in a reduced pressure state, an opening 51 communicated to atmospheric air is provided on the distribution tank 22 and a powder outflow preventive mechanism 86 to prevent outflow of a powdery material by flowing only air outside in the case when pressure in the distribution tank 22 comes to be in a positive pressure state is installed on this opening 51.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a powder transport apparatus for transporting powder using air, and more particularly to a powder transport apparatus for loading and unloading powder such as cement into a hold.

[0002]

2. Description of the Related Art Conventionally, for example, an operation of loading powder such as cement from a loading facility such as a powder storage facility installed on a quay or the like into a plurality of holds formed in a hull. As an embodiment, there is a method using a powder feeding device. That is, as shown in FIG. 9, a pair of powder pressure main pipes 102,
103 and a plurality of holds 112 to 11 formed inside the hull 111 via a number of powder pressure feed pipes 104 to 110.
9 is directly pumped. Although not shown, a switching valve is attached to each of the branch portions of the powder pressure main pipes 102 and 103 and the powder pressure support pipes 104 to 110 so that the powder pressure fed into the plurality of holds 112 to 119 can be reduced. The amount is adjusted so that the hull 111 is balanced.

[0003]

However, the method or apparatus for transporting powder having the above-mentioned structure still has the following problems to be solved. That is, since the powder is directly pumped from the powder feeding device 101 to the plurality of holds 112 to 119, an appropriate amount of powder is pumped to the holds 112 to 119 in order to balance the hull 111. In
A complicated piping configuration and a large number of switching valves are required, equipment costs are increased, and the switching operation of the switching valves becomes extremely complicated.

[0004] The present invention has been made in view of such circumstances, and once powder is supplied from a powder pumping device to a distribution tank, and then supplied to a plurality of powder storage units from the distribution tank. Accordingly, it is an object of the present invention to provide a powder transporting apparatus that can reduce equipment costs and can smoothly and easily transport powder.

[0005]

According to the present invention, there is provided a powder transporting apparatus having a powder feeding apparatus and a distribution tank connected via a powder feeding pipe, and a base connected to the distribution tank. By connecting the tips of the plurality of air chutes to the plurality of powder storage sections in a decompressed state, a powder transport flow path is formed, and an opening communicating with the atmosphere is provided in the distribution tank. When the pressure in the tank becomes a positive pressure state, a powder outflow prevention mechanism for preventing only the air from flowing out to prevent the powder from flowing out is attached.

According to the above-described structure, first, powder is pressure-fed to a distribution tank by a powder pressure feeding device, and then transferred to a plurality of depressurized powder storage units via a plurality of air chutes. it can. At this time, during normal work,
The pressure in the distribution tank is similarly reduced via the air chute in response to the reduced pressure state (negative pressure state) of the powder storage section, and the opening is communicated with the atmosphere. The powder thus obtained can be smoothly transferred to a plurality of powder storage units through a plurality of air chutes.
On the other hand, if the air chute or the like is closed and the distribution tank becomes positive pressure, the powder will flow out through the opening as it is. However, even in this case, the opening
Since a powder outflow prevention mechanism is provided for preventing only the air from flowing out and preventing the powder from flowing out, the powder can be reliably prevented from flowing out to the outside, and the powder transfer can be continued. .

[0007] Further, the above-mentioned powder transporting apparatus may have the following configuration. A distribution tank and a plurality of air chutes are installed on the hull, and a plurality of powder reservoirs are formed by a plurality of holds.
In this case, powder such as cement can be transferred to a plurality of holds using a simple and simple facility from a powder pumping device installed on the quay. The powder outflow prevention mechanism is formed from a bag filter.
In this case, it is possible to reliably prevent the powder from flowing out while using a simple structure and securing sufficient air permeability. The bag filter communicates with a spare room for accommodating ancillary equipment through an air communication pipe, and the spare room communicates with the atmosphere. In this case, it is possible to reliably prevent the filter cloth in the bag filter from getting wet by rainwater, and even if the filter cloth of the buff filter is torn, the powder flows into the spare chamber and flows out to the outside. Can be prevented.

[0008]

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. First, an overall configuration of a powder transporting apparatus A according to an embodiment of the present invention will be described with reference to FIGS. In the present embodiment, the powder transport device A is used to load powder such as cement into a plurality of holds 13 to 20 forming a plurality of powder storage sections partitioned and formed in the hull 10. This is the case of the powder transport device used.

FIGS. 1A and 1B show a hull 1 equipped with a powder transporting apparatus A according to an embodiment of the present invention.
A part of 0 is shown by a front view and a plan view. As shown in the figure, the interior of the hull 10 is partitioned into a plurality of holds 13 to 20 by bulkheads 11 and 12, and a distribution tank 2 having an upper portion communicating with or opening to the atmosphere at a substantially central position on a deck 21.
2 are installed. The holds 13 to 20 are in a negative pressure state (depressurized state) by a negative pressure generator 47 including a suction blower described later.

[0010] As shown in FIG. 2, a powder feeding device 24 is provided on the quay 23, and the powder can be fed to the distribution tank 22 by the powder feeding device 24.
That is, the powder feeding device 24 comprises a powder storage tank 24a for storing powder, an annular pressure feeding air ejection pipe 24b disposed therein, and a lower discharge port 24 of the powder storage tank 24a.
c and a compressed air jet nozzle 24d. And the lower discharge port 24c is
Is connected to a powder pressure inlet 26 provided in the upper part of the peripheral wall of the distribution tank 22 through the opening. In the lower part of the distribution tank 22, the powder is transferred from the distribution tank 22 to each of the holds 13 to 20.
Out of a plurality of air chutes 27 to 34 arranged on the deck 21 to transfer the powder, the powder inlets 35 to 38 provided at the bases of the air chutes 27 to 30 are respectively connected. On the other hand, powder outlets 39 to 46 are provided at the tip of the air chutes 27 to 34, and the powder outlets 39 to 46 are provided.
Are inserted into the upper spaces of the holds 13 to 20 in a negative pressure state in a communicating state.

With the above structure, the powder is supplied from the powder feeding device 24 through the powder feeding pipe 25 to the distribution tank 22.
And the powder fed to the distribution tank 22 is smoothly transferred into the holds 13 to 20 through the air chutes 27 to 34 by using the negative pressure generated in the holds 13 to 20. This forms a powder transport channel.

Next, the configuration of each part of the powder transporting apparatus A having the above configuration will be described in detail with reference to FIGS. As shown in FIG. 1, a spare chamber 46a is provided on the deck 21 at a position substantially directly below the distribution tank 22, and a plurality of auxiliary chambers are provided therein as auxiliary equipment through suction pipes (not shown). A negative pressure generator 47 composed of a suction blower connected to the holds 13 to 20 is provided. In the spare chamber 46a, an air press-fitting space 55 (see FIG. 4) provided at the bottom of the distribution tank 22 and a lower air press-fitting space 65 (see FIG. 7) of each of the air chutes 27 to 34.
A fan or blower (500) capable of supplying compressed air through a compressed air supply pipe (not shown).
mm to 2000 mmAq)
8 are provided.

As shown in FIGS. 1 to 6, particularly FIGS. 3 to 6, the distribution tank 22 has a bottomed cylindrical tank body 50 in which a powder inflow space 49 is formed. An opening 51 communicating with the atmosphere is formed at the center of the upper end of the tank body 50, and a fluidized bed 52 capable of ejecting air from below into the powder inflow space 49 is formed at the bottom. And
The fluidized bed 52 is formed by a flat plate 53 and a perforated conical plate 54 on which a canvas cloth is adhered and arranged at an interval on the flat plate 53, and an air press-in space 55 is formed between the two.

As shown in FIG. 3 to FIG.
In the lower part, four powder discharge ports 59 to 62 are formed at intervals in the circumferential direction. And air chute 2
Powder inlets 35 to 38 provided at the bases of 7 to 30 are connected to powder outlets 59 to 62, respectively.

Next, the configuration of the air chutes 27 to 30 will be described with reference to FIGS. As shown in FIG. 1, the air chute 27 installed on the hull 10
30 are inclined downward from the base toward the front, and the gradient is set to 1 ° to 5 °, preferably 2 ° to 4 °. As shown in FIG. 7, the interior of the air chute 27 (the same applies to other air chute 28 to 30) has an upper powder transfer space 64 and a lower air press-fit space by a canvas cloth 63 which is an example of a gas permeable plate. 65.
Then, the powder is transferred from the distribution tank 22 into the hold 13 through the upper powder transfer space 64. At this time, the lower air press-fitting space 65 is
Thus, the compressed air is supplied through the compressed air supply pipe, and the compressed air is blown into the upper powder transfer space 64 through the canvas cloth 63. Therefore, the powder can be transferred while the frictional resistance between the powder and the canvas cloth 63 during powder transfer is reduced.

As shown in FIGS. 1, 3, 4 and 8,
Flow control valves 66 to 69 such as sluice valves are connected to the powder inlets 35 to 38 of the air chutes 27 to 30, respectively. Air communication passages 70 to 73 are formed between the upstream side and the downstream side of the flow control valves 66 to 69 at the respective portions. Specifically, one end openings of the air communication passages 70 to 73 are connected to communication holes 7 provided on the ceiling wall 74 of the distribution tank 22.
The other ends of the air chutes 27 to 30 are connected to downstream portions of the flow control valves 66 to 69, respectively. With such a configuration, each of the flow control valves 66 to 69 is operated to
-20 can be loaded while uniformly distributing the powder, and the hull 10 can be balanced by loading a predetermined amount of powder into predetermined holds 13-20. At this time, since a sufficient air flow can be secured through the air communication passages 70 to 73, smooth transportation of the powder in each of the air chutes 27 to 34 can also be secured.

In the powder transporting apparatus A having the above-described structure, during normal operation, the powder in the distribution tank 22 is passed through the air chutes 27 to 34 by the powder pressure supplied to the distribution tank 22 from the powder pressure supply 24. Since the negative pressure generated in the distribution tank 22 is much larger, the powder fed to the distribution tank 22 does not flow out through the opening 51 to the outside.

However, when the air chutes 27 to 34 are closed for some reason, the distribution tank 22 becomes positive pressure, and the powder fed from the powder feeding device 24 to the distribution tank 22 flows out through the opening 51 to the outside. There is a possibility that. Therefore, in the present embodiment, as shown in FIGS. 4 to 6, a bag filter 86 is attached to the opening 51 as an example of a powder outflow prevention mechanism for preventing only air from flowing out and preventing powder from flowing out. Even in such a case, it is ensured that the powder is reliably prevented from flowing out while ensuring a sufficient inflow of air into the distribution tank 22 from the outside.

That is, the bag filter 86 is formed by attaching a closed casing 87 having an opening at the lower end face to the opening 51 and disposing a large number of cylindrical filter cloths 88 retained by a retainer in the closed casing 87. . The clean air inflow space 89 formed in the upper part of the closed casing 87 communicates with the internal space of the spare chamber 46a via an air communication pipe 90 provided on the peripheral wall of the closed casing 87. It communicates with the atmosphere through an opening 91 provided in the peripheral wall.

Next, the operation of loading the powder into the holds 13 to 20 using the powder transporting apparatus A having the above-described configuration will be described. First, the negative pressure generator 47 is operated to reduce the pressure in the holds 13 to 20 and to reduce the air chute 2.
The inside of 7 to 34 and the inside of the distribution tank 22 are reduced in pressure. In addition, the compressed air generating device 48 is operated to operate the air chute 2.
The pressure-feeding air is fed into the lower air press-fitting space 65 of 7 to 34 and jetted toward the upper powder transfer space 64. On the other hand, the powder is fed into the distribution tank 22 from the powder feeding device 24. At this time, as described above, the inside of the distribution tank 22 and the air chutes 27 to 34 are in a reduced pressure state, and the distribution tank 22 is in communication with the atmosphere via the bag filter 86 and the like. The powder thus produced smoothly passes through the air chutes 27 to 34 to the hold 13.
~ 20.

As described above, even when the distribution tank 22 has a positive pressure, the bag filter 86
The powder can be reliably prevented from flowing out to the outside while ensuring sufficient inflow of air into the distribution tank 22 from the outside. Further, by operating each of the flow control valves 66 to 69 provided on the air chutes 27 to 30, the powder can be loaded into each of the holds 13 to 20 while being uniformly distributed. At this time, the hull 10 can be balanced by loading a predetermined amount of powder in the predetermined holds 13 to 20.

As described above, the present invention has been described with reference to an embodiment. However, the present invention is not limited to the configuration described in the above embodiment, and is described in the claims. It also includes other embodiments and modifications that can be considered within the scope of the matters described.

[0023]

According to the present invention, during normal operation, the pressure in the distribution tank is reduced to the same level via the air chute in response to the reduced pressure in the powder reservoir. At the same time, since the opening communicates with the atmosphere, the powder fed into the distribution tank can be smoothly transferred to the plurality of powder reservoirs through the plurality of air chutes. On the other hand, even when the air chute or the like is closed and the distribution tank becomes positive pressure, the powder outflow prevention mechanism can reliably prevent the powder from flowing out while ensuring the air outflow. Powder transfer can be maintained.
In addition, since the distribution tank is configured to be connected to the plurality of powder storage units via the plurality of air chutes, the overall configuration of the powder transport device can be simplified, and equipment costs can be reduced.

In particular, in the powder transporting device according to the second aspect, the distribution tank and the plurality of air chutes are installed on the hull, and the plurality of powder storing sections are formed by the plurality of holds, so that they are installed on the quay. The powder such as cement can be transferred to a plurality of holds using a simple and simple facility from the powder feeding device. In the powder transport device according to the third aspect, the powder outflow prevention mechanism is formed from the bag filter, so that the powder flows out while using a simple structure and ensuring sufficient air permeability. Can be reliably prevented. In the powder transporting device according to the fourth aspect, the bag filter communicates with the spare room for accommodating ancillary equipment through the air communication pipe, and the spare room communicates with the atmosphere. It is possible to reliably prevent the powder from getting wet, and to prevent the powder from flowing into the spare chamber and flowing out even if the filter cloth of the buff filter is broken.

[Brief description of the drawings]

1 (a) and 1 (b) are a front view and a plan view, respectively, of a powder transport device according to an embodiment of the present invention.

FIG. 2 is a cross-sectional view taken along line II of FIG.

FIG. 3 is a plan view of a distribution tank in the powder transport device according to one embodiment of the present invention.

FIG. 4 is a sectional side view of the same.

FIG. 5 is a transverse sectional view of the same.

6 is a longitudinal sectional view taken along the line II-II in FIG.

FIG. 7 is a sectional view of an air chute of the powder transport device according to one embodiment of the present invention.

FIG. 8 is an explanatory view of the arrangement of a flow control valve and an air communication passage of the powder transporting apparatus according to one embodiment of the present invention.

FIG. 9 is a plan view of a conventional powder transport device.

[Explanation of symbols]

Reference Signs List A powder transport device 10 hull 11 partition wall 12 partition wall 13 hold 14 hold 15 hold 16 hold 17 hold 18 hold 19 hold 20 hold 21 deck 22 distribution tank 23 quay wall 24 powder pumping device 24a powder storage tank 24b pressure air pipe 24 Lower discharge port 24d Pressure feeding air ejection nozzle 25 Powder pressure feeding pipe 26 Powder pressure inlet 27 Air chute 28 Air chute 29 Air chute 30 Air chute 31 Air chute 32 Air chute 33 Air chute 34 Air chute 35 Powder inflow 36 Powder Inflow 37 Powder inflow 38 Powder inflow 39 Powder outflow 40 Powder outflow 41 Powder outflow 42 Powder outflow 43 Powder outflow 44 Powder outflow 45 Powder outflow 46 Powder Outflow port 46a Preliminary chamber 47 Negative pressure generator 48 Pumping air generator 49 Powder inflow space 50 Tank body 51 Opening 52 Fluidized bed 53 Flat plate 54 Perforated conical plate 55 Air press-in space 59 Powder outlet 60 Powder outlet 61 Powder outlet 62 Powder outlet 63 Canvas cloth 64 Upper powder transfer Space 65 Lower air press-fit space 66 Flow control valve 67 Flow control valve 68 Flow control valve 69 Flow control valve 70 Air communication path 71 Air communication path 72 Air communication path 73 Air communication path 74 Ceiling wall 75 Communication port 76 Communication port 77 Communication port 78 communication port 86 bag filter 87 closed casing 88 cylindrical filter cloth 89 clean air inflow space 90 air communication pipe 91 opening

Claims (4)

[Claims] 1. A powder feeding device and a distribution tank are connected via a powder feeding pipe, and a plurality of powder storage portions in a pressure-reduced state are connected to the tips of a plurality of air chutes each having a base connected to the distribution tank. To form a powder transport channel by connecting to each other, and provided an opening communicating with the atmosphere in the distribution tank, and when the pressure in the distribution tank becomes a positive pressure state, the air only A powder transport device comprising a powder outflow prevention mechanism for preventing the powder from flowing out to the outside. 2. The powder transport device according to claim 1, wherein
The powder transport device, wherein the distribution tank and the plurality of air chutes are installed on a hull, and the plurality of powder storage units are formed by a plurality of holds. 3. The powder transport device according to claim 1, wherein said powder outflow prevention mechanism comprises a bag filter. 4. The powder transport device according to claim 3, wherein
A powder transport device, wherein the bag filter communicates with a spare room for accommodating ancillary equipment through an air communication tube, and the spare room communicates with the atmosphere.