TW201520150A - Continuous unloading machine - Google Patents

Abstract

The present invention provides a continuous unloading machine, which can suppress the reduction of cargo recovery rate while increasing the movement speed of scoops. The continuous unloading machine of the present invention is a scoop elevator type continuous unloading machine having a scoop elevator for continuously conveying bulk cargo. The scoop elevator includes: a plurality of scoops (20) for scooping and carrying bulk cargo; a chain for maintaining the scoops (20); and a driving roller for driving the chain and enabling the chain to encircle thereabout, wherein a curved section (22d) is provided at a location that is inward in comparison with the ends (22g, 22h) at an inside surface (22b) of a bottom (22) of the scoop (20) that is opposite to an opening (21).

Description

Continuous unloader

The present invention relates to a bucket elevator continuous unloader.

Conventionally, as a technique in this field, a continuous unloader equipped with a bucket elevator described in Patent Document 1 is known. The bucket elevator described in Patent Document 1 includes a bucket that circulates in the elevator slot and surrounds the bucket. The bucket has two chains that are surrounded by a plurality of drive rollers, and a plurality of buckets that are mounted to hang between the two chains. In the lower part of the bucket elevator, a plurality of buckets are shoveled and loaded with bulk cargo, thereby enabling continuous handling of bulk cargo.

(previous technical literature) (Patent Literature)

Patent Document 1: Japanese Laid-Open Patent Publication No. 2001-253547

Usually, in a continuous unloader provided with such a bucket elevator, the bulk cargo in the bucket is discharged from the bucket in the vicinity of the drive roller on the upper portion of the bucket elevator. In order to improve the loading and unloading efficiency, it is expected to increase the moving speed of the bucket. However, in the vicinity of the driving roller on the upper portion of the bucket elevator, the centrifugal force of the bulk cargo acting on the bucket and the bucket becomes large, so when the bulk cargo is discharged from the bucket The machine is slow. If the timing of discharging the bulk cargo becomes slow, the bulk cargo located at the bottom of the bucket remains inside the bucket, and in this state, the bucket moves at a high speed. As a result, the amount of bulk cargo that has not been recovered in the discharge chute is increased, so that the recovery rate of the discharge chute is lowered.

In view of such a problem, an object of the present invention is to provide a continuous unloader capable of suppressing a decrease in the recovery rate of a cargo when the moving speed of the bucket is increased.

The continuous unloader of the present invention is a bucket elevator continuous unloader having a bucket elevator for continuously conveying an object, wherein the bucket elevator includes a plurality of buckets for scooping and loading an object; and retaining a chain of the bucket And driving the chain to surround the driving portion, and including at least one of a corner portion and a curved portion at a position further inside than an end portion of the bottom inner side surface on the opposite side of the bucket opening portion.

In the continuous unloader of the present invention, at least one of the corner portion and the curved portion is included at a position further inside than the end portion of the bottom inner side surface of the bucket, so that when the bucket is surrounded and the opening portion starts to tilt downward It is easy to release the goods from the bucket. Thereby, even if the centrifugal force of the cargo acting on the inside of the bucket becomes large by speeding up the moving speed of the bucket, the cargo can be quickly discharged from the bucket. Thereby, it is possible to reduce the amount of goods remaining inside the bucket, and it is possible to suppress a decrease in the recovery rate of the cargo when the moving speed of the bucket is increased.

In the continuous unloader of the present invention, in the section when the bucket is cut by the plane including the movement path of the bucket, the portion of the bottom inner side that protrudes toward the most bottom side may be located perpendicular to the moving direction with respect to the bucket. The central portion of the bottom in the direction is closer to the side of the chain. In this way, if the portion of the bottom inner side surface of the bucket that protrudes toward the bottom side is located on the side of the chain, the cargo can be efficiently discharged from the bucket, and the bucket can be effectively used to scrape the cargo.

Specifically, a configuration in which the above-described effects are obtained as appropriate is specifically a structure in which the outer surface of the bottom of the bucket has a planar shape.

In the continuous unloader of the present invention, in the cross section when the bucket is cut by the plane including the movement path of the bucket, the area of the bucket that can accommodate the object and the inner side of the bottom are along the outer side of the bottom. It is also possible to reduce the area of the planar shape by only 10% or more and 20% or less. At this time, it is possible to suppress a large reduction in the cargo accommodating space of the bucket and to suppress a decrease in the recovery rate of the cargo.

In the continuous unloader of the present invention, the side portion of the bucket opposite to the side chain of the bucket may be inclined to the opposite side with respect to the side portion of the bucket on the side of the loop. At this time, when the bucket is surrounded and the opening of the bucket starts to be inclined downward, the cargo can be easily discharged from the bucket.

Specifically, a configuration that appropriately obtains the above-described effects can be exemplified, that is, the side portion on the opposite side of the chain of the bucket includes the first surface on the bucket opening and the bottom side on the first surface. In the second side of the position, the angle of inclination of the first face with respect to the side of the chain side of the bucket is greater than the angle of inclination of the second face with respect to the side of the chain side of the bucket.

In the continuous unloader of the present invention, the side phase of the opposite side of the chain of the bucket The inclination angle of the side portion on the side of the chain of the bucket may be 20 degrees or more and 40 degrees or less. At this time, the cargo can be efficiently discharged from the bucket, and the cargo can be efficiently scooped by the bucket.

According to the present invention, it is possible to suppress a decrease in the recovery rate of the cargo when the moving speed of the bucket is increased.

1‧‧‧Continuous unloader

10‧‧‧ bucket elevator

15‧‧‧Chain (chain)

16a, 16b, 16c‧‧‧ drive roller (driver)

20, 50, 60, 70‧‧‧ buckets

M‧‧‧Bulk goods (objects)

21‧‧‧ openings

22, 52, 62, 72‧‧‧ bottom

22a‧‧‧Outside

22b, 52b, 62b‧‧‧ inside

22d‧‧‧Bend

22g, 22h, 52g, 52h, 62g, 62h, 72g, 72h‧‧‧ end

23, 24‧‧‧ side

24a‧‧‧ first side

24b‧‧‧ second side

52e, 62e‧‧ corner

72b‧‧‧ inside side (curved part)

L2‧‧‧ baseline

S1‧‧‧ accommodation space

W‧‧‧Moving track

Θ‧‧‧ tilt angle

Fig. 1 is a view showing a continuous unloader of the first embodiment.

Fig. 2 is a partial cross-sectional perspective view showing the upper portion of the bucket elevator of the continuous unloader of Fig. 1.

Fig. 3 is a cross-sectional view showing the bucket of the continuous unloader of the first embodiment.

Figure 4 is a graph showing the relationship between the lift rate of the bucket and the cargo recovery rate.

Fig. 5 is a graph showing the relationship between the inclination angle of the side portion of the bucket and the cargo recovery rate.

Fig. 6 is a cross-sectional view showing the bucket of the continuous unloader of the second embodiment.

Fig. 7 is a cross-sectional view showing the bucket of the continuous unloader of the third embodiment.

Fig. 8 is a cross-sectional view showing the bucket of the continuous unloader of the fourth embodiment.

Hereinafter, embodiments of the continuous unloader of the present invention will be described in detail with reference to the accompanying drawings.

(First embodiment)

The bucket elevator type continuous unloader (CSU) 1 shown in Figs. 1 and 2 is a device for continuously unloading bulk (object) M from the cabin 101 of the ship. Examples of the bulk cargo M include coke or ore. The continuous unloader 1 is provided with a girders 3 that can travel along the wharf 102 by two rails 2 that are laid in parallel with the wharf 102. The girders 3 are placed above the dock 102. A revolving frame 4 is rotatably supported on the upper side of the girders 3, and a bucket elevator 10 is supported at a distal end portion of the boom 5 projecting laterally from the revolving frame 4. The bucket elevator 10 is held in a vertical state by the balance lever 6 and the counterweight 8 regardless of the undulation angle of the boom 5.

The continuous unloader 1 is provided with a cylinder 7 for adjusting the undulation angle of the boom 5. When the cylinder 7 is extended, the boom 5 is raised upward and the bucket elevator 10 is raised. When the cylinder 7 is contracted, the boom 5 is lowered and the bucket elevator 10 is lowered.

The bucket elevator 10 continuously excavates and scoops up the bulk cargo M in the cabin 101 by the scooping portion 11 of the side excavation method provided at the lower portion thereof, and carries the scraped cargo M upward. The bucket elevator 10 includes an elevator main body 13 that constitutes the elevator slot 12, and a bucket 14 that performs a wraparound motion with respect to the elevator main body 13. The chain bucket 14 is provided with: a pair of chains connected in a ring shape a strip (loop) 15; and a plurality of buckets 20 supported at both ends of the pair of chains 15. The two chains 15 are oriented orthogonal to the plane containing the movement trajectory W of the bucket 20 (with the first The paper faces of the figure are orthogonal to each other). Each of the buckets 20 is attached to each of the chains 15 via a predetermined attachment so as to be suspended between the two chains 15 .

The bucket elevator 10 includes drive rollers 16a, 16b, and 16c around which the chain 15 is wound, and a steering roller 17 that guides the chain 15. The drive rollers 16a, 16b, and 16c function as a drive unit that surrounds the drive chain 15 . The driving roller 16a is provided at the uppermost portion 10a of the bucket elevator 10, the driving roller 16b is provided at the front portion of the scooping portion 11, and the driving roller 16c is provided at the rear portion of the scooping portion 11.

The steering roller 17 is a driven roller located below the driving roller 16a, which guides the chain 15 and converts the traveling direction of the chain 15 from obliquely downward to vertically downward. Further, a cylinder block 18 is interposed between the drive roller 16b and the drive roller 16c. By expanding and contracting the cylinder block 18, the distance between the arrangement shafts between the drive rollers 16b and 16c changes, whereby the movement trajectory W of the bucket 20 changes.

Further, in correspondence with the two chains 15, the drive rollers 16a, 16b, 16c and the steering roller 17 also have two, and are arranged side by side in a direction orthogonal to the plane including the movement trajectory W of the bucket 20. Further, the drive rollers 16a, 16b, 16c drive the chain 15, whereby the chain 15 performs a circumferential movement along the movement trajectory W with respect to the elevator body 13. The chain 15 and the bucket 20 move around and circulate between the uppermost portion 10a of the bucket elevator 10 and the scooping portion 11.

As shown in FIG. 2, a discharge chute 31 for recovering the bulk cargo M is provided below the drive roller 16a and on the opposite side of the chain 15 of the steering roller 17. Further, a sprinkle preventing portion 40 is provided between the two driving rollers 16a to prevent the bulk cargo M from being collected in the discharge chute 31 and falling into the cabin 101 or the like. The sprinkle preventing portion 40 rotates together with the driving roller 16a so as to follow the outer circumference of the driving roller 16a. The spill prevention portion 40 rotates in a state of being located between the bucket 20 and the other bucket 20.

The sprinkle preventing portion 40 includes a pair of first plate-like portions 41 extending between the bucket 20 and the other bucket 20 along the movement trajectory W, and a second plate-like portion 42 interposed between the pair of first Between the plate-like portions 41. Among the bulk cargo M dropped from the bucket 20, the bulk cargo M to be dropped from between the bucket 20 and the drive roller 16a toward the cabin 101 abuts against the second plate-shaped portion 42, thereby being able to pass to the discharge chute 31. Discharge more bulk cargo M.

Further, the sprinkle preventing portion 40 may not have the shape of the first plate-like portion 41 and the second plate-like portion 42 as described above, and may have other shapes. Instead of the first plate-like portion 41, the sprinkle preventing portion having only the second plate-like portion 42 may be used instead of the sprinkle preventing portion 40 including the first plate-like portion 41 and the second plate-like portion 42. Further, a spatter preventing portion having a three-dimensional shape such as a rectangular parallelepiped instead of the plate portions 41 and 42 may be used. In short, the shape of the spill prevention portion can be appropriately changed as long as it has a portion in contact with the bulk cargo M.

As shown in FIG. 1, the lower end of the discharge chute 31 is connected to the rotary feeder 32 disposed on the outer circumference of the bucket elevator 10. The rotary feeder 32 transports the bulk cargo M carried out from the discharge chute 31 to the boom 5 side. Boom The boom conveyor belt 33 is disposed on the fifth conveyor, and the boom conveyor belt 33 supplies the bulk cargo M conveyed from the rotary feeder 32 to the hopper 34. A conveyor belt feeder 35 and an in-machine conveyor belt 36 are disposed below the hopper 34.

The continuous unloader 1 is used to unload the bulk cargo M as follows. The scooping portion 11 of the lower end portion of the bucket elevator 10 is inserted into the cabin 101, and the chain 15 is surrounded by the movement locus W. As a result, the bucket 20 located in the scooping unit 11 continuously excavates and scoops up the bulk cargo M such as coke or ore. The bulk cargo M picked up by the bucket 20 and loaded on the bucket 20 is conveyed toward the uppermost portion 10a of the bucket elevator 10 as the chain 15 ascends, and is conveyed along the vertical upper side.

As shown in Fig. 2, when the bucket 20 on which the bulk cargo M is loaded is raised, the opening portion 21 of the bucket 20 that is originally upward is gradually inclined. Then, after the bucket 20 reaches the uppermost portion 20a of the movement trajectory W, the opening portion 21 of the bucket 20 gradually slopes downward from the horizontal direction, and the bulk cargo M gradually starts to fall from the bucket 20.

Here, if the bucket 20 starts to reverse by passing through the uppermost portion 20a, a part of the bulk cargo M inside the bucket 20 falls on the front side of the bucket 20 (see arrow D1), and another part of the bulk cargo M falls. The sprinkle preventing portion 40 is attached (see arrow D2). Further, the bulk cargo M that has fallen in front of the bucket 20 or the remaining bulk cargo M that falls outside the bulk cargo M of the spill prevention portion 40 gradually begins to fall. Each of the bulk goods M abuts on the wall surface 10b of the side surface of the bucket elevator 10 or the outer side surface 22a of the bottom portion 22 of the other bucket 20, and falls on the discharge chute 31.

The bulk cargo M falling on the discharge chute 31 is carried out to the rotary feeder The 32 side is further transported to the hopper 34 by the transfer of the boom conveyor belt 33. Further, the bulk cargo M is carried out to the ground side device 37 by the conveyor belt feeder 35 and the in-machine feeder 36. By repeating the above operation using a plurality of buckets 20, the bulk cargo M in the cabin 101 can be continuously unloaded.

However, when the bucket 20 is further moved in order to increase the loading and unloading efficiency of the bulk cargo M, the centrifugal force of the bulk cargo M acting on the bucket 20 and the bucket 20 is increased, thereby discharging the bulk cargo M from the bucket 20. The timing is slow. When the timing of discharging the bulk cargo M is slow, the bulk cargo M located on the bottom portion 22 side of the bucket 20 remains inside the bucket 20, and in this state, the bucket 20 moves at a high speed.

When the bucket 20 moves at a high speed in a state where the bulk cargo M remains inside the bucket 20, when the bucket 20 reaches the position of the steering roller 17, the bucket 20 moves vertically downward. As a result, the discharge timing is slow, and the amount of bulk M that has not been recovered in the discharge chute 31 is increased, so that the recovery rate of the discharge chute 31 is lowered. Hereinafter, the bucket 20 capable of suppressing a decrease in the recovery rate of the bulk cargo M will be described.

As shown in Fig. 3, the structure of the bucket 20 includes an opening portion 21, a bottom portion 22, a first side portion 23 on the side of the chain 15 (the center side of the movement trajectory W) on the movement trajectory W, and a movement trajectory. The second side portion 24 on the opposite side of the chain 15 (the outer side of the moving track W). FIG. 3 shows a cross section when the bucket 20 is cut by a plane including the movement trajectory W of the bucket 20. Further, since the bucket 20 is attached to the outer side of the chain 15, the side of the chain 15 indicates the center side (inside) of the movement trajectory W of the annular bucket 20, and the opposite side of the chain 15 indicates the movement trajectory of the bucket 20. The outside.

The first side portion 23 on the side of the chain 15 has a flat shape and extends in parallel with respect to the movement trajectory W. Further, the outer side surface 22a of the bottom portion 22 has a planar shape and is inclined with respect to the imaginary line L1 orthogonal to the first side portion 23 such that the end portion on the second side portion 24 side is close to the opening portion 21 side. By tilting the outer side surface 22a of the bottom portion 22 as described above, it is possible to achieve the following objective: the bulk cargo M smoothly falls on the discharge chute 31; the resistance when excavating the bulk cargo M is lowered; and the bulk cargo M is stably unloaded.

A flat portion 22c located on the opposite side of the chain 15 (upper side in the paper surface of FIG. 3) is provided at a position further inside than the end portions 22g and 22h of the inner side surface 22b of the bottom portion 22 of the bucket 20; The curved portion 22d of the 15 side (the lower side in the paper surface of Fig. 3). The flat portion 22c has a planar shape along the outer side surface 22a, and the curved portion 22d has a curved shape that is curved toward the opening portion 21 side with respect to the outer side surface 22a.

A portion of the inner side surface 22b of the bucket 20 that protrudes toward the bottom portion 22 side is a boundary portion 22e between the flat portion 22c and the curved portion 22d. The boundary portion 22e extends in the axial direction of the drive roller 16a (the depth direction in the plane of the paper in Fig. 3). The boundary portion 22e is located closer to the chain 15 than the central portion of the bottom portion 22 in the direction perpendicular to the moving direction of the bucket 20 (the direction in which the first side portion 23 extends) in the cross section shown in FIG. The position of the side. Here, the bucket 20 moves along the chain 15, so the moving direction of the bucket 20 indicates the direction along the chain 15. Further, the boundary portion 22e is located closer to the chain 15 side than the reference line L2, and the reference line passes through the intermediate point n of the vertical line L3 hanging from the top portion 27 toward the first side portion 23 and The first side portions 23 extend in parallel.

Further, the bent portion 22d is formed of a curved plate 26 fixed to the bottom portion 22 and the first side portion 23 by welding or the like. The curved plate 26 is fixed in the accommodation space S1 of the bulk M of the bucket 20 so as to cover the inner surface side of the top portion 25 between the bottom portion 22 and the first side portion 23. The bucket 20 is lifted by the curved plate 26. Further, the curved space 26 is formed with a sealed space S2 on the inner surface side of the sealing top portion 25.

The sealed space S2 is formed by the curved plate 26, the portion 22f on the top 25 side of the bottom portion 22, and the portion 23a on the top 25 side of the first side portion 23. Here, the portion 22f on the top 25 side of the bottom portion 22 and the portion 23a on the top 25 side of the side portion 23 may be omitted. That is, the outer shape of the bucket 20 can be changed along the curved side plate 26 with the outer side surface 22a of the bottom portion 22. Further, instead of the curved plate 26, for example, a portion of the sealed space S2 may be filled with concrete or the like so that the portion of the sealed space S2 is solid, thereby forming the curved portion 22d.

Here, when the bucket is newly manufactured, the buckets of the portions 22f and 23a on the top 25 side are omitted from the beginning instead of the bucket 20, which makes it easier to manufacture. Further, when the existing bucket is modified, the curved plate 26 is added to the existing bucket, and the time and time required for remanufacturing the bucket can be reduced, which is preferable.

The ratio of the accommodation space S1 to the sum of the accommodation space S1 of the bucket 20 and the sealed space S2 is higher than 80% and lower than 90%. That is, in the cross section shown in Fig. 3, the area of the bucket 20 in which the accommodation space S1 of the bulk cargo M can be accommodated is the same as the inner side surface 22b which does not have the curved plate 26 and the bottom portion 22 is outside. The area of the side surface 22a in the planar shape is only 10% or more and 20% or less. Hereinafter, the ratio of the area of the sealed space S2 to the sum of the area of the accommodation space S1 and the area of the sealed space S2 may be referred to as a "lift rate".

A top portion 27 is provided on the opposite side of the chain 15 in the bottom portion 22, and a second side portion 24 is formed from the top portion 27 toward the opening portion 21. The second side portion 24 is formed in a plate shape similarly to the first side portion 23. The inner side surface of the second side portion 24 includes a first surface 24a on the side of the opening portion 21 and a second surface 24b on the side closer to the bottom portion 22 than the first surface 24a. The first surface 24a and the second surface 24b are continuous via a corner portion 24c that protrudes toward the inside of the bucket 20. This corner portion 24c extends in the axial direction of the drive roller 16a. The second surface 24b extends parallel to the first side portion 23, and the first surface 24a is inclined at an oblique angle θ with respect to the opposite side of the chain 15 with respect to the first side portion 23 (second surface 24b).

Further, the second surface 24b does not necessarily have to extend in parallel with respect to the first side portion 23, and may be inclined with respect to the first side portion 23 toward the opposite side of the chain 15. Further, the shape of the inner side surface of the second side portion 24 may not be the shape of the first surface 24a, the second surface 24b, and the corner portion 24c, and may extend from the top portion 27 toward the opening portion 21 and relative to the first side portion 23. A planar shape that is inclined toward the opposite side of the chain 15.

As described above, in the continuous unloader 1, the curved portion 22d is included at a position further inside than the end portions 22g and 22h of the inner side surface 22b of the bottom portion 22 of the bucket 20, so that the opening portion 21 starts to be turned when the bucket 20 is surrounded. When the lower side is inclined, it is easy to discharge the bulk cargo M from the bucket 20. That is, within the bucket 20 The bulk cargo M easily flies out toward the wall surface 10b side of the bucket elevator 10 shown in Fig. 2 .

Thereby, even if the centrifugal force of the bulk cargo M acting on the inside of the bucket 20 becomes large by speeding up the moving speed of the bucket 20, the bulk cargo M can be quickly discharged from the bucket 20. Thereby, since the bulk cargo M remaining in the inside of the bucket 20 can be reduced, it is possible to suppress a decrease in the recovery rate of the bulk cargo M when the moving speed of the bucket 20 is increased.

Further, the portion of the inner side surface 22b of the bottom portion 22 that protrudes toward the bottom portion 22 side (the boundary portion 22e) is located closer to the side of the chain 15 than the central portion of the bottom portion 22 in the direction perpendicular to the moving direction of the bucket 20. The location. Thereby, the bulk cargo M can be efficiently discharged by the bucket 20, and the bulk cargo M can be efficiently scooped by the bucket 20.

Further, in the cross section when the bucket 20 is cut by the plane including the movement trajectory W of the bucket 20, the area of the accommodating space S1 of the bucket 20 capable of accommodating the bulk M and the inner side surface 22b of the bottom portion 22 are along the outside. The area of the accommodation space of the side surface 22a is only 10% or more and 20% or less smaller than the area of the accommodation space. That is, the lifting rate of the bucket 20 is 10% or more and 20% or less.

Fig. 4 is a simulation result showing the relationship between the lift rate of the bucket 20 and the recovery rate of the bulk cargo M. As shown in Fig. 4, when the lifting rate of the bucket 20 is set to 0% without using the curved plate 26, the recovery rate of the bulk cargo M to the discharge chute 31 in the state A where the moisture content is low is slightly. More than 92%. Further, the recovery rate of the bulk cargo M to the discharge chute 31 in the state B in which the amount of water is moderate is slightly higher than 88%. Among them, the amount of moisture represents the amount of moisture contained in the bulk cargo M.

On the other hand, when the curved plate 26 is fixed to the inside of the bucket 20 and the lifting rate of the bucket 20 is set to 10%, the recovery rate of the bulk cargo M in the state A is increased to nearly 99%, in the state B. The recovery rate of bulk M has increased to around 95%. Further, when the lift rate of the bucket 20 is 20%, the recovery rates of the bulk cargo M are closer to 100% in the state A and the state B.

As described above, by increasing the lifting rate of the bucket 20, the recovery rate of the bulk cargo M to the discharge chute 31 can be increased. In addition, when the lifting rate of the bucket 20 is 10% or more and less than 20%, it is possible to suppress a large decrease in the accommodation space S1 of the bucket 20 and to suppress a decrease in the recovery rate of the bulk cargo M. In addition, it is also possible to increase the distance between the first side portion 23 and the second side portion 24 in accordance with the shallower setting of the bucket 20, thereby avoiding a reduction in the volume of the accommodation space S1.

Further, the second side portion 24 is inclined with respect to the first side portion 23 toward the opposite side of the chain 15. Thereby, when the bucket 20 is surrounded and the opening portion 21 of the bucket 20 starts to tilt downward, the bulk cargo M can be easily discharged from the bucket 20.

Fig. 5 is a simulation result showing the relationship between the inclination angle of the second side portion 24 of the bucket 20 and the recovery rate of the bulk cargo M. As shown in FIGS. 3 and 5, when the inclination angle θ of the first surface 24a with respect to the first side portion 23 is 10 degrees, the recovery rate of the bulk cargo M to the discharge chute 31 is about 93%. On the other hand, when the inclination angle θ is 20 degrees, the recovery rate of the bulk cargo M is slightly more than 95%, and when the inclination angle θ is 30 degrees, the recovery rate is about 98%, and the inclination angle θ is set. 40 degrees or more At the time, the recovery rate is about 99%.

As described above, when the inclination angle θ is 20 degrees or more and 40 degrees or less, the bulk cargo M can be efficiently discharged from the bucket 20, and the bulk cargo M can be efficiently scooped by the bucket 20 .

Further, as shown in FIG. 2, the sprinkle preventing portion 40 is provided between the bucket 20 and the other bucket 20, so that the bulk M dropped from the bucket 20 is guided to the discharge by the sprinkling preventing portion 40. Chute 31. Thereby, the spill prevention portion 40 contributes to an increase in the recovery rate of the bulk cargo M.

Further, in the bucket 20, the curved portion 26 is formed by fixing the curved plate 26 to the inside of the bucket 20. Thereby, the curved portion 22d can be formed only by fixing the curved plate 26 inside the existing bucket, so that the recovery rate of the bulk cargo M can be easily improved. Further, when the curved plate 26 is formed in the outer shape of the bucket 20, the bucket can be made lighter than when the curved space 26 is used to form the sealed space S2.

(Second embodiment)

Next, a second embodiment will be described with reference to Fig. 6. In the continuous unloader of the second embodiment, the bucket 50 using the flat plate 56 is provided instead of the bucket 20 using the curved plate 26. In the following, the same components as those in the first embodiment are denoted by the same reference numerals, and the description of the portions overlapping the first embodiment will be omitted.

At a position further inside than the end portions 52g and 52h of the inner side surface 52b of the bottom portion 52 of the bucket 50, a flat portion 52c on the opposite side of the chain 15; a flat portion 52d on the side of the chain 15; and a flat portion are provided. A corner portion 52e between the 52c and the flat portion 52d. The corner portion 52e extends in the axial direction of the driving roller 16a. The flat portion 52c has a planar shape along the outer side surface 22a, and the flat portion 52d extends toward the opening portion 21 side with respect to the bottom portion 52.

As described above, in the second embodiment, the corner portion 52e is included at the inner side of the end portions 52g and 52h of the inner side surface 52b of the bottom portion 52 of the bucket 50, whereby the opening portion 21 is started when the bucket 50 is surrounded. When the lower side is inclined, it is easy to discharge the bulk cargo M from the bucket 50. Thereby, even if the centrifugal force of the bulk cargo M acting on the inside of the bucket 50 is increased by speeding up the moving speed of the bucket 50, the bulk cargo M can be quickly discharged from the bucket 50. As a result, similarly to the first embodiment, it is possible to suppress a decrease in the recovery rate of the bulk cargo M.

(Third embodiment)

As shown in Fig. 7, the bucket 60 of the continuous unloader according to the third embodiment uses a flat plate 66 having a different size and arrangement than the flat plate 56 of the second embodiment. At a position further inside than the end portions 62g and 62h of the inner side surface 62b of the bottom portion 62 of the bucket 60, a flat portion 62c on the opposite side of the chain 15; a flat portion 62d on the side of the chain 15; and a flat portion are provided. A corner 62e between the 62c and the flat portion 62d. The flat plate 66 extends substantially perpendicularly relative to the first side portion 23, and the corner portion 62e is located near the intersection of the reference line L2 of the bucket 60 and the bottom portion 62. In the third embodiment, the corner portion 62e is included at the inner side of the end portions 62g and 62h of the inner side surface 62b of the bottom portion 62 of the bucket 60. Therefore, similarly to the second embodiment, the scattering can be suppressed. The recovery rate of the goods M is reduced.

(Fourth embodiment)

As shown in Fig. 8, the bucket 70 of the continuous unloader according to the fourth embodiment uses a curved plate 76 different in size and arrangement from the curved plate 26 of the first embodiment. A position closer to the inner side than the end portions 72g and 72h of the inner side surface 72b of the bottom portion 72 of the bucket 70 is a curved portion that extends from the inner surface side of the top portion 27 to the first side portion 23 and is opposite to the outer side surface. 22a is bent toward the opening portion 21 side. The inner side surface 72b is formed by a curved plate 76 that is fixed to the first side portion 23 and the top portion 27 by welding or the like inside the bucket 70.

In the fourth embodiment, the position closer to the inner side than the end portions 72g and 72h of the inner side surface 72b of the bottom portion 72 of the bucket 70 is a curved portion. Therefore, it is possible to suppress a decrease in the recovery rate of the bulk cargo M. Further, in the fourth embodiment, the bottom portion 72 and the portion 23a on the top portion 25 side of the side portion 23 may be omitted, and the curved plate 76 may be the bottom portion of the bucket 70.

The embodiments of the present invention have been described above, but the present invention is not limited to the embodiments described above, and modifications may be made without departing from the spirit and scope of the invention. For example, in the second embodiment, as shown in Fig. 6, a corner portion 52e is formed on the inner side surface 52b of the bottom portion 52 of the bucket 50. However, it is also possible to form a plurality of corner portions on the inner side surface of the bottom of the bucket, and it is also possible to form both the corner portion and the curved portion on the inner side surface.

20‧‧‧ bucket

21‧‧‧ openings

22‧‧‧ bottom

22a‧‧‧Outside

22b‧‧‧ inside

22c‧‧‧flat

22d‧‧‧Bend

22e‧‧‧ junction section

22f‧‧‧ the top part of the bottom

22g, 22h‧‧‧ end

23, 24‧‧‧ side

23a‧‧‧Part of the top side of the first side

24a‧‧‧ first side

24b‧‧‧ second side

24c‧‧‧ corner

25, 27‧‧‧ top

26‧‧‧Bending board

N‧‧‧ intermediate point

L1‧‧‧ imaginary line

L2‧‧‧ baseline

L3‧‧‧ vertical line

S1‧‧‧ accommodation space

S2‧‧‧ sealed space

Θ‧‧‧ tilt angle

Claims (7)

A continuous unloader, which is a bucket elevator continuous unloader having a bucket elevator for continuously conveying an object, wherein the bucket elevator includes a plurality of buckets for scooping and loading the object; a chain of the bucket; and a driving portion that drives and surrounds the chain link, including a corner portion and a bending portion at a position inside the end portion of the bottom inner side surface on the opposite side of the opening portion of the bucket At least one of them. The continuous unloader according to claim 1, wherein in the cross section when the bucket is cut by a plane including the movement locus of the bucket, the inner side surface of the bottom portion protrudes toward the bottom side The portion is located closer to the aforementioned end chain than the central portion of the bottom portion in a direction perpendicular to the moving direction of the bucket. The continuous unloader according to claim 1 or 2, wherein the outer side surface of the bottom portion of the bucket has a planar shape. The continuous unloader according to the third aspect of the invention, wherein the bucket is capable of accommodating the portion of the object in a cross section when the bucket is cut by a plane including a movement locus of the bucket The area is only 10% or more and 20% or less smaller than the aforementioned area when the inner side surface of the bottom portion has a planar shape along the outer surface of the bottom portion. The continuous unloader according to the first or second aspect of the invention, wherein the side portion of the bucket opposite to the side chain of the bucket is inclined to the opposite side with respect to a side portion of the bucket on the side of the chain side. . The continuous unloader according to claim 5, wherein the side portion of the bucket opposite to the side of the chain includes a first surface located at an opening of the bucket and located at a front side of the first surface The second surface of the bottom side position has an inclination angle of the first surface with respect to a side portion of the bucket on the side of the chain side that is larger than an inclination angle of the second surface with respect to a side portion of the bucket on the side of the chain side. The continuous unloader according to claim 5, wherein an angle of inclination of a side portion of the bucket opposite to the side of the chain side with respect to a side portion of the bucket on the side of the chain side is 20 degrees or more and 40 degrees. Below the degree.