JP2001315970A - -device for preventing scattering of dust and fallen powder for powder and grain carrying machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a seal structure capable of preventing the scattering of the fallen powder of powder and grain adhered to the belt of a belt conveyor and dusting and rocking following the rocking motion of a vertical carrying part. SOLUTION: In a powder and grain carrying machine using the belt conveyor, this device comprises a circular side cover fixed to the tip of the boom of a horizontal carrying part, a circular guide rail formed on the circular side cover, a seal belt bent pulley capable of rolling along the circumference of the guide rail, a pair of seal belts suspended along the circular guide rail with being off-centered by the seal belt bent pulley, and a lower side cover for blocking the side part of the suspended part of the seal belt. One end of the seal belt is fixed, and the other end is connected to a belt fastening device. The belt conveyor is enclosed by the seal belt and both the side covers, and the seal belt and the lower side cover are integrally rocked with the vertical carrying part by the rolling of the seal belt bent pulley according to the rocking of the vertical carrying part.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a powdery and granular material transporting machine for transporting loose materials such as powders and granules between, for example, a pair of stacked conveyor belts. A horizontal (horizontal) transport section and a vertical (up / down) transport section to prevent falling and scattering of powder and granules attached to the belt on the way from the horizontal transport section to the vertical transport section, and to generate dust. And a dust / dropping scattering prevention device.

[0002]

2. Description of the Related Art Bulk materials such as coal, iron ore, and grains (hereinafter referred to as "granules") are unloaded from, for example, a hold and transported to another location, or conversely, loaded from a loading location on the ground into the hold. As a device, a pair of belt conveyors are superimposed to form a double belt conveyor, which is bent from the horizontal conveying section to the vertical conveying section, and the vertical conveying section is caused to swing (swing) about the upper end as a fulcrum. Twin belt conveyors are known. The powder and granules are sandwiched between the overlapped belts of the double belt conveyor, and are conveyed from the upper and lower conveyance units to the horizontal conveyance unit by rotation of the belt,
It is delivered from the mounting side of the horizontal transport section to a carry-out conveyor on the ground.

The horizontal transport section is held by a boom that pivots and raises and lowers, and the vertical transport section is supported by a swing frame or a vertical frame pivotally attached to the tip of the boom and swings in a vertical plane. . Although the granular material is sandwiched between the superposed belts, the granular material also adheres to the upper or lower outer surface of the belt, and is sent to the leading end side by the horizontal transport unit as the belt travels. The belt deposits fall and scatter from the end of the boom, and dust is also generated with the transport operation. Conventionally, a buffer plate such as a rubber plate is attached to the end of the boom in order to prevent such particles from falling and scattering from the end of the boom. Is known to be dropped into a vertical frame of the image.

FIG. 11 is a partial schematic view showing a conventional powder-fall preventing structure in this type of twin-belt transfer machine. An upper end portion of a vertical frame 6 is pivotably supported at a tip end portion of a boom 5 extending in a horizontal direction from a turning frame (not shown), and the boom 5 is provided with a horizontal transport section 10 comprising a double belt conveyor, and The upper and lower transport units 11 are held by the frame 6, respectively. In this case, the return belt on the upper belt conveyor of the double belt conveyor viewed from the horizontal transport section 10 is an upper return belt 15 here.
The return belt of the lower belt conveyor is referred to as a lower return belt 16. In the upper and lower conveyors 11, the belt on the return side of the belt conveyor located on the original side of the double belt conveyor, that is, on the inner side of the conveyor (the revolving frame side), becomes the lower return belt 16, and the outer side (for example, the sea side) The belt on the return side of the belt conveyor located at the side of the upper side becomes the upward return belt 15. The upper end of a rubber plate 17 of an appropriate length is fixed to the tip of the boom 5, whereby the rubber plate 17 is suspended in a “goodwill” state along the return belt 15.

At the time of unloading, the upper and lower overlapping belts 18 which are in contact with each other run toward the conveyor base while holding the powder and granular material therebetween, and the outer return belt 15 and the lower return belt 16 are attached to the base return. Then, the vehicle travels back from the unit side to the lower end of the vertical transport unit 11. At this time, the powder particles attached to the surface of the outer return belt 15 are removed from the upper return belt 15.
As the vehicle travels, it falls obliquely downward from the tip of the horizontal transport unit 10 and collides with the rubber plate 17 to be taken into the frame 6 from the receptacle 19 at the upper part of the vertical frame 6 and is prevented from scattering around. You.

[0006]

Although the above-mentioned rubber goodwill type dust-preventing structure has a certain effect on the upturning belt portion as a primary buffering function against the falling of the granular material, a certain effect is recognized. Some powder particles scatter to the side after colliding with the plate, which is not enough to completely prevent powder falling and scattering.
Further, the granular material does not collide with the rubber plate against the downward return belt, and the effect cannot be expected. It has no effect on dust generation. The rubber plate is fixed at the upper end to the undulating boom of the horizontal transport unit and is merely suspended from the end of the boom, and when strong wind or turning of the boom, dusting does not hit the rubber plate due to the undulating operation. There is also. Further, there are many problems such as lack of followability with respect to the boom undulating operation and the vertical frame swing operation.

According to the present invention, it is possible to effectively prevent the falling of the powder particles attached to the outer surface of the vertical return belt of the double belt conveyor and the surrounding dust accompanying the transport operation, In addition, it can swing completely following the swinging movement of the upper and lower conveyors, avoiding dangerous swinging movement due to strong wind etc., and scattering dust and falling powder of the twin belt type powder carrier which can ensure safe operation It is to provide a prevention device.

[0008]

According to the present invention, there is provided a horizontal transport section which is held by a revolving frame so as to be able to pivot and undulate, and a vertical transport section which is pivotally attached to the tip of the horizontal transport section. And a double belt conveyor disposed from a base portion of the horizontal transport portion to a lower end of the vertical transport portion, and transports the powder and granules sandwiched between upper and lower overlapping belts of the double belt conveyor. In the twin-belt type granular material transport device, an arc-shaped side cover fixed to the tip of the undulating boom of the horizontal transport portion, and a swing center of the vertical transport portion formed on the arc-shaped side cover, An arc-shaped guide rail having an arc center, a seal belt bend pulley disposed adjacent to the arc-shaped side cover and capable of rolling along an outer peripheral portion of the arc-shaped side cover, and the arc-shaped guide Stretch along the rails A pair of seal belts which are passed over and are deflected by the seal belt bend pulley and which hang down along the vertical frame of the upper and lower transport section, and side portions of the seal belt which are attached to the vertical frame and which hang down. A lower side cover that shields the seal belt, the seal belt is swingable with the vertical transport unit, and one end thereof is fixed, and the other end is connected to belt tensioning means,
A dust / dropping scattering prevention device of a twin-belt type powder and granular material transport device in which the periphery of the double belt conveyor is surrounded by the pair of seal belts and the arc-shaped side cover and the lower side cover. Provided.

[0009]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, preferred embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a schematic overall side view of a twin-belt type granular material transfer device equipped with a dust / dropping scattering prevention device according to one embodiment of the present invention. The powder and particle carrier of this example is disclosed in, for example, Japanese Patent Application Laid-Open No. H11-246050.
As disclosed in Japanese Patent Laid-Open Publication No. H10-260, the present invention is configured as an unloading / loading machine, but it goes without saying that the present invention is also applicable to a twin-belt type powder / particle carrier other than this type. First, referring to FIG. 1, a brief description will be given of the outline thereof. A tubular column 1 is installed on a quay, and a revolving frame 3 is provided above a column 1 via a revolving device 2. An up-and-down boom 5 of the horizontal transport unit 10 is provided at the upper end of the turning frame 3 so as to be able to undulate with respect to the turning frame 3.
The horizontal transport unit 10 is configured to perform an up / down operation by an up / down drive cylinder 8 mounted between the base of the revolving frame 3 and the up / down boom 5. The vertical frame 6 of the up-down transport unit 11 is connected to the tip of the up-and-down boom 5, and a swing drive cylinder 7 mounted between the up-and-down boom 5 and the vertical frame 6.
As a result, the vertical frame 6, that is, the vertical transport unit 11 oscillates in a vertical plane with the tip of the undulating boom 5 as a fulcrum.

[0010] Two superimposed belt conveyors 12 are installed so that their belt conveying surfaces are superimposed from the front end of the vertical frame 6 to the vicinity of the base of the hoisting boom 5. A screw feeder portion F is provided adjacent to an end pulley of the double belt conveyor 12 via an end pulley holding frame. The vertical frame 6 and the double belt conveyor 12 constitute an upper and lower transport section 11 of this embodiment, and the up-and-down boom 5 and the double belt conveyor 12 constitute a horizontal transport section 10.

A dust / dropping scattering prevention device 60 according to the present invention is provided at the tip of the undulating boom 5 of the horizontal transport unit 10, and a pair of seal belts 20, 21 described below are attached to the vertical frame 6 of the vertical transport unit 11. Extending downward along a distance. FIG. 2 is a side view of the dust / dropping scattering prevention device at the connecting portion between the horizontal transport unit and the vertical transport unit, and FIG.
FIG. 4 is a side view as viewed from above, and is a diagram in which a part of a vertical frame is cut and shown. The seal belt structure includes an upper seal belt 2 facing the return belt 15 of the double belt conveyor 12.
0 and the lower seal belt 21 facing the lower return belt 16, so that the double belt conveyor 12 of the upper and lower transport unit 11 is sandwiched between the upper and lower seal belts 20 and 21. A bend pulley 22 of the upper and lower lap belt 18 and a bend pulley 23, 25 of a return belt 15 and a return belt 16 of a return belt 16 are supported by the tip of the up-and-down boom 5, respectively. I have. Further, an arc-shaped side cover 26 is fixed to the tip of the undulating boom 5. This arcuate side cover 2
Numerals 6 are provided on both ends of the boom 5 so as to sandwich the upper and lower belts 18 and the upper and lower return belts 15 and 16 when viewed from a direction (arrow F) perpendicular to the axis of the bend pulley 22 of the upper and lower belts 18. .

When the vertical frame 6 of the upper and lower transport section 11 swings around the bend pulley 22 of the upper and lower belt 18, the movable return belt bend pulley 27 located below the bend pulley 22 is also connected to the vertical frame 6. It swings together, but for that purpose, the arc-shaped side covers 2 on both sides
6, an arc-shaped long groove 28 through which a shaft 27a of the lower belt bend pulley 27 passes is formed. The long groove 28 is closed by a rubber plate 29 cut at the center along the longitudinal direction of the groove 28, and the shaft 2 of the lower belt bend pulley 27 is closed.
7a protrudes outward from the notch 29a.

An arc-shaped guide rail 3 on the upper seal belt side centered on the axis of the bend pulley 22 of the vertically overlapping belt 18 is provided on the peripheral edge and the inner side surface of the arc-shaped side cover 26.
0 and the lower seal belt side arc-shaped guide rail 31 are fixed. FIG. 4 is a cross-sectional view taken along the line AA of FIG. 2 and shows the upper seal belt side arc-shaped guide rail 30. FIG. 5 is a cross-sectional view taken along the line BB of FIG. 2 and shows the lower seal belt side arc-shaped guide rail 31. Upper seal belt side circular guide rail 30
Is formed in the shape of an outer flange from the peripheral edge of the arcuate side cover 26, and the leading edge 30a is bent into an L-shape. The side facing the return belt 15 of the double belt conveyor 12 is The upper seal belt 20 is disposed along the upper seal belt side arc-shaped guide rail 30.

An arcuate guide rail 31 on the lower seal belt side is formed in the shape of an inner flange on the inner surface of the arcuate side cover 26, and the lower seal belt similarly faces the lower return belt 16 of the double belt conveyor 12. The lower seal belt 21 is arranged along the belt-side arcuate guide rail 31. An upper seal belt bend pulley 32 and a lower seal belt bend pulley 33 are respectively arranged near the lower part of the guide rails 30 and 31, and the upper ends of the upper seal belt 20 and the lower seal belt 21 are the tip of the up-and-down boom 5. The guide rails 30 and 31 are fixed downward through intermediate pipes 45 and 46, and are bent downward by the upper and lower seal belt bend pulleys 32 and 33 from the middle of each of the guide rails 30 and 31 to have an appropriate length along the vertical frame 6. Hanging down.

FIG. 6 is an enlarged sectional view taken along line CC of FIG. At the lower ends of the upper and lower seal belts 20 and 21, a square plate-shaped weight 35 as a belt tensioning device is attached. A plurality of weight guide rollers 36 are supported by bearings 36a on one side near each side of the weight 35. A weight guide rail 37 having a U-shaped cross section is mounted on the frame 6 outside the seal belts 20 and 21 along the vertical frame 6. Each of the seal belts 20 and 21 is pulled downward with a certain tension by the weight of the weight 35. As shown in FIG. 2, the weight guide rail 37 is provided to extend up and down by a certain length from the weight position of the seal belts 20 and 21, and the weight guide roller 36 extends along the weight guide rail 37. As a result, the weight 35, and thus the hanging portions of the seal belts 20 and 21, are guided during the swinging operation of the vertical transport unit 11. A plurality of support roller means are supported on the vertical frame 6 so as to alternately sandwich the front and back surfaces of the seal belts 20, 21.
An intermediate part of the hanging part of the first part is supported.
With this supporting roller means, the bending of the seal belts 20 and 21 can be eliminated without increasing the weight of the weight 35 so much. In this embodiment, the supporting roller means is provided as shown in FIG.
As shown in FIG.
Have a structure arranged side by side at predetermined intervals in the axial direction.

Adjacent to the lower part of the arc-shaped side cover 26, a substantially rectangular lower side cover 40 having a concave arc-shaped upper edge 40a along the peripheral edge of the side cover 26 is formed by upper and lower seal belts 20, 21. Is attached to the vertical frame 6 so as to shield between the side parts of the hanging part. A rubber plate is attached to the front and rear side edges 40b and 40c of the upper edge 40a of the lower side cover 40 so as to protrude from the edges, and the edges of the rubber plate are formed by the arcuate side cover 26 and the upper and lower seat belts. The gaps between the lower side cover 40 and the arcuate side covers 26 and the upper and lower seat belts 20 and 21 and the lower side cover 40 are brought into contact with each other. The lower side cover 40 extends downward along the seal belts 20 and 21 with an appropriate length, and specifically, extends at least to a portion near the upper end of the weight guide rail 37 as shown in FIG. Accordingly, in the upper part of the vertical frame 6, the periphery of the double belt conveyor 12 of the upper and lower conveying unit 11 is formed by the arcuate side covers 26 on both sides, and the pair of seat belts 2
0, 21 and the lower side cover 40 on both sides thereof are shielded by a sealing structure. In addition, in order to facilitate internal inspection during maintenance of the apparatus, the arc-shaped side cover 26 and the lower side cover 40 have opening / closing inspection openings 4.
1 is provided.

The vertical frame 6 of the upper and lower transport unit 11 includes a frame cover 5 surrounding four sides of the frame 6 from the middle to the lower portion of the lower side cover 40 to the lower end of the frame.
5 is fixed. Therefore, a pair of seal belts 20 that hang down along the inside of the vertical frame 6,
Structures extending inside the vertical frame 6, such as the guide rail 37 of the weight 21, the weight 35, and the double belt conveyor 12, are covered with a frame cover 55. A boom cover is also mounted on the upper side of the up-and-down boom 5 of the horizontal transport section 10, and the double belt conveyor 12 of the horizontal transport section 10 along the up-and-down boom 5 is covered with the boom cover.

During the unloading operation, the double belt conveyor 12
The granular material is sandwiched between the upper and lower overlapping belts 18 and is conveyed from the lower end of the upper and lower conveying unit 11 to the original side of the horizontal conveying unit 10.
0 and travels back to the vertical transport unit 11, and at this time, the powder particles adhered to the surfaces of the vertical return belts 15 and 16 are bent by the double belt conveyor 12 between the horizontal transport unit 10 and the vertical transport unit 11. In the part, but as mentioned above,
Seal belts 20 and 2 around the heavy belt conveyor 12
1. Arcuate side cover 26 and lower side cover 4
Since it is shielded by 0, it falls into the vertical frame 6 without being scattered around and is returned to the hold.

Although dust is also generated in accordance with the transport operation, the dust is prevented from being scattered around the cover 42 and the seal belts 20, 21 and the side covers 26, 40 of the up-and-down boom 5 of the horizontal transport section 10. The width of the upper seal belt 20 along the outer flange-shaped upper guide belt-side arc-shaped guide rail 30 is slightly smaller than the width of the lower seal belt 21 along the inner flange-shaped lower seal belt-side arc-shaped guide rail 31. As described above, these seal belts 20, 21 and the lower side cover are formed by a band-shaped rubber plate bordered by the lower side cover 40 that covers the upper part of the hanging part of the upper and lower seal belts 20, 21 as described above. Care is taken so that there is no gap between the side edges of the forty.

When the vertical transport section 11 swings with respect to the horizontal transport section 10, the upper seal belt bend pulley 32 and the lower seal belt bend pulley 33 are moved by the swing of the vertical frame 6. The lower and upper side covers 40 of the upper and lower seal belts 20, 21 which roll and move along the arc-shaped guide rails 30, 31 and are bent downward by the upper and lower seal belt bend pulleys 32, 33.
Also swings along with the vertical frame 6 in the same direction, so that there is no scattering of dust and dust outside the seal belt. FIG. 8 shows a state in which the lower end of the upper and lower transport section 11 has swung to the sea side to the maximum. In this state, the upper seal belt 20 on the upper return belt is in the maximum extension state, and the lower seal on the lower return belt side. The belt 21 is in the minimum stretched state. FIG. 9 shows the vertical transport unit 1
1 is at the maximum swing to the opposite side (land side) from FIG.
The upper seal belt 20 on the return belt side is in a minimum extended state,
The lower seal belt 21 on the lower return belt side is in the maximum extension state.

In the above embodiment, the upper and lower seal belts 2
The upper ends of 0 and 21 are fixed to the up-and-down boom 5, and the weight 35 is attached to the lower end to extend in a downwardly tensioned state. The weight 35 slides on the vertical frame 6 when the vertical transport unit 11 swings. However, in another embodiment of the present invention, the lower end of each of the upper and lower seal belts 20 and 21 may be fixed to the vertical frame 6 and the upper end may be pulled up by an appropriate pulling means. FIG. 10 is a schematic view of the dust / dropping scattering prevention device in this case. Upper and lower seal belt 2
The lower ends 20a, 21a of the reference numerals 0, 21 are fixed to the vertical frame 6, and extend upward along the vertical frame 6, and the upper seal belt 20 passes through the upper seal belt bend pulley 32 to the upper seal belt side of the arc-shaped side cover 26. It extends along the arc-shaped guide rail 30 and is bent by a bend pulley 50 at the tip of the up-and-down boom, passes through the cover on the upper surface of the up-and-down boom 5, and is connected to a belt tensioning device 52 near the boom base. Similarly, a lower end of the lower seal belt 21 is fixed to the vertical frame 6, extends along the lower seal belt side arc-shaped guide rail 31 via the lower seal belt bend pulley 33, and extends along the lower seal belt side. From the bend pulley 51 at the upper end of the arc-shaped guide rail 31, it is connected to the belt tensioning device 53 on the base portion along the undulating boom 5.

In this embodiment as well, the hanging portions of the upper and lower seal belts 20 and 21 swing with the swinging operation of the vertical frame 6, but the upper and lower seal belts 20 and 21 are always restored by the respective belt tensioning devices 52 and 53. The belts 20 and 2 extend from the vertical transport unit 11 to the horizontal transport unit 10 by the swinging operation of the vertical transport unit 11 because the belts 20 and 2
1 does not occur, and the seal belts 20, 21
Swings following the swing of the vertical transport unit 11.
Also in this embodiment, a lower side cover 40 that closes the side portions of the upper and lower seal belts 20 and 21 is provided below the arc-shaped side cover 26, thereby covering the periphery of the bent portion of the double belt conveyor 12, Even when the vertical transport unit 11 swings, the upper and lower return belts 15, 1
Scattering of the powder and particles falling from around 6 and dust are prevented. In this embodiment, the weight 35 at the lower end of the seal belt, its guide roller 36, and the double guide rail 37 are unnecessary, and the upper and lower seal belts 20 and 21 are not required.
It is not necessary to provide a supporting roller means (for example, the disc-shaped roller 38 in FIG. 7) at the lower part of the vertical transport section 11, so that the vertical transport section 11 becomes thin, and the scraping section provided at the lower end of the vertical transport section 11 is hatched. The cargo can be moved closer to the side in the hidden hold, and cargo handling efficiency can be improved. The belt tensioning devices 52 and 53 on the horizontal transport section 10 are not limited to the spring type or the weight type as shown in the figure. For example, the upper ends of the respective seal belts 20 and 21 are connected to a piston rod of a cylinder device. Alternatively, the entire seal belt may be held in tension from the horizontal transport unit 10 to the vertical transport unit 11.

The present invention can be applied not only to the end of the boom of a granular material transporting machine having a horizontal transport section and a vertical transport section, but also to the prevention of powder falling and dust scattering at all places where the transport section swings. Yes, and can be applied to any movable dust collection points. The present invention can be similarly applied not only to unloading devices such as ship unloaders, but also to loading devices and other general collecting devices. In addition, the belt structure of the belt conveyor that conveys powder and granules is also 2
Not only heavy belts but also finned belts (special belts with ears)
Can also be applied to those using.

[0024]

As described above, according to the present invention, the four sides of the periphery of the conveyor at the place where dusting and dusting occur are completely surrounded by the sealing structure, so that the upper and lower sides of the belt conveyor are provided. The powder particles adhered to the surface of the return belt are prevented from scattering around the dust and generating dust when the powder is dropped, thereby enabling safe and environmentally conscious operation. The seal structure follows the operation of the conveyer unit that turns and swings, and does not inadvertently swing due to a strong wind or the like. In this respect, reliable and safe operation is ensured. No power is required for the follow-up operation with respect to the transport unit.Also, despite the structure surrounding the transport unit, the outer shape of the transport unit does not increase and is applicable to a narrow discharge location. When used as an unloader for ships, there are many advantages, such as a dust / dropping scattering prevention device having a wide application range from large ships to small ships.

[Brief description of the drawings]

FIG. 1 is a schematic overall side view of a twin-belt type powder / particle carrier equipped with a dust / dropping scattering prevention device according to an embodiment of the present invention.

FIG. 2 is a side view of a dust / dropping scattering prevention device at a connecting portion between a horizontal transport unit and a vertical transport unit of the granular material transport device in the embodiment of FIG. 1;

FIG. 3 is a partially cut side view as viewed from the direction of arrow F in FIG. 2;

FIG. 4 is a sectional view taken along the line AA of FIG. 2;

FIG. 5 is a sectional view taken along the line BB of FIG. 2;

FIG. 6 is an enlarged sectional view taken along line CC of FIG. 2;

FIG. 7 is a side view of a support roller means of a seal belt hanging part according to the embodiment of the present invention.

FIG. 8 is a side view showing a state in which the lower ends of the upper and lower transport units are swung to the sea side to the maximum in the embodiment of FIG. 2;

FIG. 9 is a side view showing a state in which the upper and lower transport units are swung to the opposite side (land side) to the maximum in FIG. 7;

FIG. 10 is a schematic side view of a dust / dropping scattering prevention device according to another embodiment of the present invention.

FIG. 11 is a partial schematic view showing a conventional powder falling prevention structure in a twin-belt conveyor.

[Explanation of symbols]

 Reference Signs List 5 Undulating boom 6 Vertical frame 10 Horizontal transport section 11 Vertical transport section 15 Upward belt 16 Downward belt 20 Upper seal belt 21 Lower seal belt 26 Arc side cover 30 Upper seal belt side circular guide rail 31 Lower seal belt side Circular guide rail 32 Upper seal belt bend pulley 33 Lower seal belt bend pulley 35 Weight (belt tensioning device) 37 Weight guide rail 40 Lower side cover 52, 53 Belt tensioning device 60 Dust / dropping scattering prevention device

Claims (3)

[Claims] 1. A horizontal transport section held by a revolving frame so as to be capable of pivoting and raising and lowering, an upper and lower transport section pivotally attached to a tip of the horizontal transport section, and a base section of the horizontal transport section. And a belt conveyor disposed from the lower conveyor to the lower end of the upper and lower conveyors, wherein the conveyor is configured to convey the granules using the belt conveyor. Arc-shaped side cover, and an arc-shaped guide rail formed on the arc-shaped side cover and having the swing center of the vertical transport portion as the arc center, and arranged adjacent to the arc-shaped side cover, And a seal belt bend pulley that can roll along the outer periphery of the arc-shaped side cover, and is stretched along the arc-shaped guide rail,
And a pair of seal belts which are deflected by the seal belt bend pulley and hang down along the vertical frame of the upper and lower transport section, and are attached to the vertical frame and shield side portions of the lower part of the seal belt. A lower side cover, wherein the seal belt is swingable with the vertical transport portion, and one end of the seal belt is fixed, and the other end is connected to belt tensioning means. A dust / dropping prevention device for a powder and granular material transporter, wherein a periphery of the belt conveyor is surrounded by a cover and the lower side cover. 2. The seal belt according to claim 1, wherein one end of the seal belt is fixed to a tip of the up-and-down boom, and the belt tensioning means is constituted by a weight guided along the vertical frame. The dust / dropping scattering prevention device of the granular material transfer machine described in the paragraph. 3. The seal belt according to claim 1, wherein one end of the seal belt is fixed to a middle part of the vertical frame, and the other end extends along the up-and-down boom and is connected to belt tensioning means held by the up-and-down boom. 2. The dust / dropping scattering prevention device for a granular material transporter according to claim 1.