Flower Falling Prevention Device

Abstract

To prevent falling of a bulk on a double belt conveyor.SOLUTION: A bulk fall prevention device is used for a double belt conveyor which includes a first belt 101 and a second belt 102 overlapping with each other and separated gradually from the overlapping portion, and which transports a bulk by interlocking and rotating the first belt 101 and the second belt 102, in a state of holding the bulk held at the overlapping portion. The bulk fall prevention device includes a first skirt 11 and a second skirt 12 disposed between the first belt 101 and the second belt 102 being gradually separated from the overlapping portion. The first skirt 11 extends in the belt extending direction, is installed at a position deviated from the center in the belt width direction, and receives the bulk going toward the outside in the belt width direction. The second skirt 12 extends in the belt extending direction, is disposed further outside than the first skirt 101 in the belt width direction, and receives an object to be transported going toward the outside in the belt width direction.SELECTED DRAWING: Figure 3

Description

Technical Field

[0001] The present invention relates to a device for preventing bulk materials from falling at the clamping part of a double belt conveyor.

Background Art

[0002] Bulk materials such as coal or limestone transported by ship are unloaded from the ship's hold to land at the port. For unloading such bulk materials, for example, an unloader equipped with a double belt conveyor (sandwich belt conveyor) described in Patent Document 1 is used. The unloader described in Patent Document 1 has a main belt and a secondary belt facing each other, and the bulk materials are sandwiched and conveyed at the joining part. The tip portions of the main belt and the secondary belt located inside the ship's hold are in a skirt shape that spreads in a direction away from each other. Bulk materials are fed onto this skirt-shaped portion (skirt part) by a paddle feeder, a vibrating feeder, or the like. Then, the main belt and the secondary belt sandwich and convey the bulk materials fed into the skirt part.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] In the unloader described in Patent Document 1, both side surfaces in the width direction of the skirt part, which is the entrance of the bulk materials, are open. For this reason, when the bulk materials are sandwiched between the main belt and the secondary belt, there is a risk that the bulk materials will spill from both side surfaces of the skirt part. In such a case, the conveyance of the bulk materials by the unloader cannot be performed efficiently.

[0005] Therefore, an example of the object of the present invention is to provide a device for preventing bulk materials from falling, which prevents the bulk materials from spilling when conveyed by a double belt conveyor.

Means for Solving the Problem

[0006] To achieve the above object, the loose object falling prevention device according to one aspect of the present invention is provided with a first belt and a second belt that overlap each other and gradually separate from the overlapping portion, and is used for a double belt conveyor that conveys the object to be conveyed by rotating the first belt and the second belt in conjunction with each other while holding the object to be conveyed at the overlapping portion, and is a loose object falling prevention device, and includes a first skirt and a second skirt disposed between the first belt and the second belt that gradually separate from the overlapping portion, The first skirt extends in the belt extending direction and is installed at a position deviated from the center in the belt width direction, and receives the object to be conveyed that heads toward the outside in the belt width direction, The second skirt extends in the belt extending direction, is disposed outside the first skirt in the belt width direction, and receives the object to be conveyed that heads toward the outside in the belt width direction.

Advantages of the Invention

[0007] According to the configuration of the present invention, when conveying loose objects with a double belt conveyor, it is possible to prevent the loose objects from spilling.

Brief Description of the Drawings

[0008]

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

Figure 6

DETAILED DESCRIPTION OF THE INVENTION

[0009] Hereinafter, the double belt conveyor will be described with reference to the drawings. The double belt conveyor is a belt conveyor that sandwiches and conveys an object to be conveyed between two belts. In the following description, the object to be conveyed will be described as bulk materials such as coal, limestone, or iron ore.

[0010] FIG. 1 is a view for explaining a double belt conveyor 100 using bulk material fall prevention according to the present embodiment.

[0011] The double belt conveyor 100 is a part of an unloader for lifting bulk materials in a cargo hold 200 provided, for example, at the bottom of a ship. In FIG. 1, the direction toward the drawing surface is the upward direction on the ship, and the direction toward the bottom of the drawing is the bottom direction of the ship. That is, the vertical direction in the drawing is the vertical direction. The double belt conveyor 100 is provided such that its lower part is located inside the cargo hold 200 and its upper part is located outside the ship (for example, above the deck). The double belt conveyor 100 thus provided conveys the bulk materials in the cargo hold 200 taken in at its lower part onto the ship.

[0012] The bulk materials conveyed onto the ship by the double belt conveyor 100 are transferred to another belt conveyor (not shown) extending in the horizontal direction disposed near the upper end of the double belt conveyor 100. Thereafter, the bulk materials are conveyed from the ship to the land by another belt conveyor.

[0013] The double belt conveyor 100 has a first belt 101 and a second belt 102. The first belt 101 and the second belt 102 are supported by a plurality of rollers, but only some of the rollers are shown in FIG. 1.

[0014] Each of the first belt 101 and the second belt 102 is an endless belt, which is stretched over a plurality of rollers to form a loop. The first belt 101 and the second belt 102 are provided such that a part of them faces each other and overlaps. The double-belt conveyor 100 sandwiches bulk materials therebetween and conveys them from the cargo hold 200 onto the ship.

[0015] Hereinafter, in the loop-shaped first belt 101 and second belt 102, the side for conveying bulk materials is referred to as the carrier side, and the side where the belt that has finished conveying the bulk materials to the ship returns to the conveying inlet in the cargo hold 200 is referred to as the return side.

[0016] The first belt 101 is stretched over and supported by a first roller 151 disposed in the cargo hold 200 and a second roller 152 disposed on the ship. Also, the carrier side of the first belt 101 is supported by a plurality of rollers (not shown) so as to project in an arc shape to the outside of the loop from below (the cargo hold 200) upward (the ship).

[0017] Note that the support configuration by rollers on the return side of the first belt 101 is not particularly limited. Also, although not shown, a tension adjusting device for adjusting the tension applied to the belt is provided so that a constant tension is always applied to the first belt 101.

[0018] The second belt 102 is stretched over and supported by a plurality of rollers disposed inside and outside the cargo hold 200. The carrier side of the second belt 102 extends horizontally in the cargo hold 200 and then extends from the cargo hold 200 toward the ship so as to project in an arc shape to the inside of the loop.

[0019] The first belt 101 and the second belt 102 face each other at the arcuate portion. When there is no loose material, the first belt 101 and the second belt 102 are in close contact at the arcuate portion. The loose material is held and conveyed between the first belt 101 and the second belt 102 at this closely contacting portion. When conveying the loose material, a conveying area filled with the loose material is formed between the first belt 101 and the second belt 102.

[0020] Figure 2 is a cross-sectional view taken along line II-II of Figure 1. When loose material is sandwiched between the first belt 101 and the second belt 102, the central portion of the second belt 102 in the width direction curves convexly to the side opposite to the first belt 101, and both side portions in the width direction come into close contact with both side portions of the first belt 101. Thereby, a conveying area 120 for holding the loose material is formed between the first belt 101 and the second belt 102. In Figure 2, the illustration of the loose material in the conveying area 120 is omitted.

[0021] Note that the support structure by rollers on the return side of the second belt 102 is not particularly limited. Also, although not shown, a tension adjusting device for adjusting the tension applied to the belt is provided so that a constant tension is always applied to the second belt 102.

[0022] The second belt 102 is held so as to gradually separate from the first belt 101 from the portion overlapping the first belt 101. Hereinafter, the area between the first belt 101 and the second belt 102 that gradually separates from the overlapping portion is referred to as the conveying area entrance.

[0023] When loose material is placed on the horizontal portion of the second belt 102 that extends horizontally in the cabin 200, the double belt conveyor 100 configured as described above conveys the loose material toward the conveying area entrance. Then, the double belt conveyor 100 sandwiches and holds the loose material between the first belt 101 and the second belt 102, and conveys it vertically upward from the cabin 200 onto the ship.

[0024] As described above, at the entrance of the conveyance area, the overlapping first belt 101 and second belt 102 gradually separate from each other as they move away from the overlapping portion (as they move to the left in FIG. 1). At this entrance of the conveyance area, there is a risk that the loose objects may fall out from the side of the belt.

[0025] Therefore, in order to prevent the loose objects from falling at the entrance of the conveyance area, a loose object fall prevention device 10 is provided at the entrance of the conveyance area.

[0026] FIG. 3 is a cross-sectional view taken along line III-III in FIG. 1. Also in FIG. 3, similar to FIG. 2, the illustration of the loose objects is omitted.

[0027] The cross-sectional shape of the conveyance area 120 as viewed from the belt extending direction shown in FIG. 2 gradually separates from the central side in the width direction as it approaches the entrance of the conveyance area, and as shown in FIG. 3, only the ends of the first belt 101 and the second belt 102 are in close contact with each other. In the cross-sectional shape of the conveyance area 120 shown in FIG. 3, the regions where the distance between the first belt 101 and the second belt 102 becomes narrower from the central part in the width direction towards both ends are referred to as the end regions 120A and 120B.

[0028] As shown in FIG. 3, the loose object fall prevention device 10 has a pair of first skirts 11 and a pair of second skirts 12.

[0029] The pair of first skirts 11 extend along the belt extending direction, and the tip portions are provided so as to enter between the first belt 101 and the second belt 102 that are in close contact. That is, when the loose objects are being conveyed, the tip portions of the pair of first skirts 11 are positioned inside the conveyance area 120. Also, each of the pair of first skirts 11 is provided at a position offset from the center in the width direction of the belt. Specifically, as shown in FIG. 3, the pair of first skirts 11 are provided so as to be closer to the end regions 120A and 120B than the center in the width direction when viewed from the belt extending direction.

[0030] This pair of first skirts 11 is provided to be in close contact with the upper first belt 101 and separated from the lower second belt 102 among the facing first belt 101 and second belt 102.

[0031] FIG. 4 is a view of one of the pair of first skirts 11 seen along the width direction from the center in the width direction. Since the other of the pair of first skirts 11 has the same configuration as the one, the description thereof is omitted.

[0032] The first skirt 11 has a skirt body 111, an upper skirt rubber 112A and a lower skirt rubber 112B attached to the skirt body 111. The upper skirt rubber 112A and the lower skirt rubber 112B are attached to the skirt body 111 so as to be located on the center side in the width direction. And in FIG. 4, a part of the skirt body 111 hidden by the skirt rubbers 112A and 112B is shown by a broken line.

[0033] The skirt body 111 is, for example, a steel plate. As shown by the broken line in FIG. 4, the lower surface portion of the tip of the skirt body 111 is linear, and the upper surface portion thereof is inclined so as to gradually approach the lower surface portion toward the tip.

[0034] The lower skirt rubber 112B is a plate-shaped rubber extending substantially linearly. The lower skirt rubber 112B is attached to the lower surface portion side of the skirt body 111 so as to protrude more than the lower surface portion. The lower skirt rubber 112B is attached to the skirt body 111 by, for example, bolts. The tip of the lower skirt rubber 112B is inclined such that its upper surface approaches the lower surface toward the tip, similar to the tip of the skirt body 111.

[0035] The upper skirt rubber 112A is a plate-shaped rubber, similar to the lower skirt rubber 112B. The upper skirt rubber 112A is attached to the upper surface portion side of the tip of the skirt body 111 so as to protrude from the upper surface portion. The upper skirt rubber 112A is attached in close contact with the lower skirt rubber 112B by, for example, bolts or the like.

[0036] The upper skirt rubber 112A is in close contact with the lower skirt rubber 112B, and its upper surface has a shape such that it is linear with the inclined surface at the tip of the lower skirt rubber 112B with which it is in close contact. A part of the upper surface of the upper skirt rubber 112A has a curved surface with the same curvature as that of the first roller 151, and when the first skirt 11 is arranged, the curved surface can be arranged in contact with the first roller 151 without a gap.

[0037] The upper skirt rubber 112A and the lower skirt rubber 112B are attached to the skirt body 111 in close contact to form one skirt rubber. And the skirt rubber has a shape that gradually becomes thinner toward the tip when viewed in the width direction. The first skirt 11 with such a configuration is provided in close contact with the first belt 101 at a position where the tip of the skirt rubber is located within the conveyance area 120 and is deviated from the center in the width direction as described above.

[0038] Each of the pair of second skirts 12 extends along the belt extension direction, similar to the first skirt 11, and the tip is provided so as to enter between the first belt 101 and the second belt 102 with which it is in close contact. That is, when conveying the bulk material, the pair of second skirts 12 are arranged such that their tips are located within the conveyance area 120. As will be described later, the pair of second skirts 12 can move in a direction away from the conveyance area entrance along the belt extension direction.

[0039] The pair of second skirts 12 are provided so as to be located outside the first skirt 11 in the width direction.

[0040] This pair of second skirts 12 is provided so as to be in close contact with the upper first belt 101 and the lower second belt 102 of the facing first belt 101 and second belt 102, respectively.

[0041] FIG. 5 is a view of one of the pair of second skirts 12 as seen along the width direction from the center in the width direction. Since the other of the pair of second skirts 12 has the same configuration as the one, the description thereof will be omitted.

[0042] The second skirt 12 has a skirt main body 121, an upper skirt rubber 122A and a lower skirt rubber 122B attached to the skirt main body 121. The upper skirt rubber 122A and the lower skirt rubber 122B are attached to the skirt main body 121 so as to be located on the center side in the width direction. And in FIG. 5, a part of the skirt main body 121 that is hidden by the skirt rubbers 122A and 122B and not visible is shown by a broken line.

[0043] The skirt main body 121 is, for example, a steel plate. As shown by the broken line in FIG. 5, the lower surface portion of the tip of the skirt main body 121 is linear, and the upper surface portion thereof is inclined so as to gradually approach the lower surface portion toward the tip.

[0044] The skirt main body 121 is supported by the moving part 13. Although it will be described in detail later, the skirt main body 121 is configured to move along the belt extending direction by the moving part 13.

[0045] The lower skirt rubber 122B is a plate-shaped rubber extending substantially linearly. The lower skirt rubber 122B is attached to the lower surface portion side of the skirt main body 121 so as to protrude more than the lower surface portion. The lower skirt rubber 122B is attached to the skirt main body 121 with, for example, bolts. The tip of the lower skirt rubber 122B is inclined such that its upper surface approaches the lower surface toward the tip, similar to the tip of the skirt main body 121.

[0046] The upper skirt rubber 122A is a plate-shaped rubber, similar to the lower skirt rubber 122B. The upper skirt rubber 122A is attached to the upper surface portion side of the tip of the skirt body 121 so as to protrude from the upper surface portion. The upper skirt rubber 122A is attached in close contact with the lower skirt rubber 122B, for example, with bolts.

[0047] The upper skirt rubber 122A is in close contact with the lower skirt rubber 122B, and its upper surface has a shape such that it is linear with the inclined surface of the tip of the lower skirt rubber 122B with which it is in close contact.

[0048] The upper skirt rubber 122A and the lower skirt rubber 122B are attached to the skirt body 121 in close contact to form a single skirt rubber. And the skirt rubber has a shape that gradually narrows toward the tip when viewed from the width direction. The second skirt 12 with such a configuration is provided in contact with the first belt 101 and the second belt 102 at a position where the tip of the skirt rubber is located within the conveyance area 120 and between the outer end of the belt in the width direction and the first skirt 11, as described above.

[0049] As shown in FIG. 3, the thickness of the upper skirt rubber 122A and the lower skirt rubber 122B of the second skirt 12 is thinner than the thickness of the upper skirt rubber 112A and the lower skirt rubber 112B of the first skirt 11.

[0050] In this way, the first skirt 11 and the second skirt 12 are arranged near both ends of the belt in the width direction. For this reason, the first skirt 11 and the second skirt 12 are configured to receive the scattered objects heading toward the side of the belt. Thereby, it is possible to prevent the scattered objects from spilling from the side of the belt at the entrance of the conveyance area.

[0051] In addition, as shown in FIGS. 3 and 4, a pair of first skirts 11 disposed on the inner side in the width direction do not contact the second belt 102, and a gap is formed therebetween. As a result, the first skirt 11 receives only the upper loose goods among the loose goods loaded on the second belt 102. Then, the second skirt 12 receives the loose goods that the first skirt 11 could not receive. That is, by providing two skirts (the first skirt 11 and the second skirt 12), the amount of loose goods received by each skirt can be reduced compared to the case where only one skirt is provided. As a result, the service lives of the first skirt 11 and the second skirt 12 can be extended, and the number of maintenance times can be reduced.

[0052] Also, the amount of loose goods received and the pressing force received from the loose goods are greater for the first skirt 11 closer to the center in the width direction than for the second skirt 12. For this reason, the thicknesses of the upper skirt rubber 122A and the lower skirt rubber 122B of the second skirt 12 can be made thinner than those of the first skirt 11. As a result, cost reduction can be achieved.

[0053] Furthermore, in the first skirt 11 and the second skirt 12, since the portions in close contact with the first belt 101 and the second belt 102 respectively are rubber, it is possible to avoid the risk of the first belt 101 and the second belt 102 being scratched or damaged.

[0054] As described above, the second skirt 12 is supported by the moving part 13 and is movable along the belt extending direction as shown in FIG. 6. FIG. 6 is a view showing a state in which the second skirt 12 is moved away from the entrance of the conveying area.

[0055] The moving part 13 includes a main body part 131, a moving rail 132, a pair of rollers 133, and a counterweight 134.

[0056] The moving rail 132 is disposed above the horizontal portion of the second belt 102. As shown in FIG. 1, the moving rail 132 extends substantially parallel to the horizontal portion of the second belt 102. The second skirt 12 is adapted to move along this moving rail 132.

[0057] The main body portion 131 supports the skirt main body 121 of the second skirt 12. The main body portion 131 rotatably supports a pair of rollers 133. The pair of rollers 133 holds the moving rail 132 therebetween. The pair of rollers 133 rotate manually or by a control device (not shown). The main body portion 131 is adapted to move along the moving rail 132 when the pair of rollers 133 rotate. A counterweight 134 for stabilizing the attitude of the second skirt 12 is provided on the main body portion 131.

[0058] Since the second skirt 12 is movable along the belt extending direction, the second skirt 12 can be moved in a direction away from the conveyance area entrance. Thereby, an operator performing maintenance can access the first skirt 11 located inside the second skirt 12 in the width direction from the side of the belt. As a result, the operator can visually observe the first skirt 11 and perform its maintenance, for example, removing bolts - nuts and replacing the upper skirt rubber 112A and the lower skirt rubber 112B.

Explanation of Signs

[0059] 10 : Debris - dropping prevention device 11 : First skirt 12 : Second skirt 13 : Moving part 100 : Double - belt conveyor 101 : First belt 102 : Second belt 111 : Skirt main body 112A : Upper skirt rubber 112B : Lower skirt rubber 120 : Conveyance area 120A: End region 120B: End region 121: Skirt body 122A: Upper skirt rubber 122B: Lower skirt rubber 131: Main body part 132: Moving rail 133: Roller 134: Counterweight 151: First roller 152: Second roller 200: Cabin

Claims

1. A bulk object drop prevention device for use in a double belt conveyor that includes a first belt and a second belt that overlap each other and gradually move away from the overlapping portion, and that conveys the conveyed object by rotating the first belt and the second belt in conjunction with each other while holding the conveyed object at the overlapping portion, a first skirt and a second skirt disposed between the first belt and the second belt and spaced apart from the overlapping portion; The first skirt is the conveyor extends in a belt extension direction, is disposed at a position offset from the center in the belt width direction, and receives conveyed objects moving toward the outside in the belt width direction; The second skirt is a first skirt extending in the belt extension direction, disposed outside the first skirt in the belt width direction, and receiving an object moving toward the outside in the belt width direction; In a state in which the object to be conveyed is held at the overlapping portion, the cross-sectional shapes of the first belt and the second belt as viewed from the belt extension direction are such that both ends of the first belt and both ends of the second belt in the belt width direction are pressed against each other, and the distance between the first belt and the second belt becomes narrower toward both ends in the belt width direction, The second skirt is disposed in the area where the spacing is narrowed. Bulk item falling prevention device.

2. A bulk object fall prevention device as described in claim 1, wherein when the transported object is held at the overlapping portion, the first skirt is in close contact with the first belt and the second skirt is in close contact with the first belt and the second belt.

3. Each of the first skirt and the second skirt includes a skirt body and a skirt rubber attached to the skirt body, A bulk object fall prevention device as described in claim 1 or claim 2, wherein the thickness of the skirt rubber of the second skirt is thinner than the thickness of the skirt rubber of the first skirt.

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