JP2003095415A - Bucket conveyor device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a bucket conveyor device being simple in arrangement and easy to manufacture and assemble, and allowing the vertical movement of the bottom of a casing to be stably adjusted without the vertical movement impairing sealability between the interior wall and the bottom of the casing. SOLUTION: A bottom unit 18 is positioned as it is curved in the form of an arc downwardly spaced apart from the track of the reverse rotation of a bucket 16 near the bottom of the casing and is mounted in the casing in such a manner as to be capable of vertical movement as a whole. The bottom unit includes split bottom plates 22 pivotally attached to each other, and also includes a support mechanism 20 which causes vertical movement of the entire bottom unit while supporting the split bottom plates from below in such a way that both of the curved end edges of the bottom unit 18 can be driven to move into and out of contact with the interior wall of the casing. Because both of the curved end edges of the bottom unit are moved into or out of contact with the interior wall of the case as necessary, abrasion by sliding motion will not occur during the vertical movement of the unit, so sealability is secured and fine adjustments of the vertical movement can be smoothly made.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a bucket conveyor device for scooping up a conveyed object loaded in the bottom of a casing with a bucket traveling in the vertical direction and conveying it upward.
In particular, the present invention relates to a bucket conveyor device capable of ensuring a sealing property without causing a residue of grains or the like to be conveyed at the bottom of the casing during use.

[0002]

2. Description of the Related Art Conveying devices for soybeans, corn, millet, barley, and other granular materials containing cereals are widely used in food, beverage manufacturing factories, warehouses, transportation companies, importers and exporters, etc., using these as raw materials. ing. In particular, in recent years, warehouses and the like have become large in size and high-rise, and conveyors have been installed on each floor to carry in / out a required storage warehouse. Further, there is known a vertical bucket conveyor that carries out a vertical transfer in association with a transfer conveyor on each floor, and in this vertical bucket conveyor, a plurality of buckets vertically arranged inside the casing are arranged. There is known a device in which a powdery or granular material that has been placed and dropped from the charging port toward the inside of the casing and that has been charged to the bottom of the casing is scooped by a bucket and conveyed upward.

[0003]

[Problems to be Solved by the Invention]

Regarding this vertical bucket conveyor, for example, a grain lifting / transporting device shown in Japanese Utility Model Laid-Open No. 4-121914 has been proposed. In this transporting device, the shape of the inner surface of the grain receiver 51 is set to the tip of the bucket 52a. The shape of the grain receiver 51 is formed along the circular trajectory, and the position of the grain receiver 51 is freely changeable between a position close to the circular trajectory and a position separated from the circular trajectory. However, since the grain receiver 51 is moved up and down while the grain receiver 51 and the inner wall of the device main body 50 are always in close contact with each other in this transport device, for example, the outer edge portion of the grain receiver 51. The packing applied to the above is damaged early by several movements, the sealability is destroyed, and the granular material is blown out of the grain receiver 51 by pressure to reduce the transported items, and at the bottom of the grain receiver. Moreover, there is a problem that the powdery particles discharged to the outside are scattered or accumulated to reduce the efficiency of cleaning work or maintenance work. Furthermore, in this carrying device, the bucket lever 51a is simply operated to change the two positions of the grain receiver 51, that is, the position close to the orbit and the position separated from the orbit. In the case where the conveyor chain of the conveyor is gradually expanded during use, it is difficult to practically move the grain receiver 51 downward without any step, which is not practical. Furthermore, when moving the grain receiver up and down by operating the operating lever provided outside, the grain flows through the inside of the device body, so a transmission mechanism that receives the operation must be provided outside the device body. Since it is necessary to remodel and install the existing device main body, the manufacturing cost becomes high.

On the other hand, the applicant has a patent No. 305,050.
In No. 3, a bucket conveyor device was proposed in which the bottom wall of the casing was formed into a curved shape along the rotational trajectory of the bucket tip, and the gap between the bucket tip and the inner surface of the bottom wall was adjustable. In this device, the bottom wall is divided into three parts, and the bottom walls on both ends of the curve are pivotally attached to the walls of the casing, and slide plates are provided to overlap the bottom walls on both ends. For example, only the U-shaped central portion is moved downward in a state of being fixedly pivoted to the casing, and therefore, the overlapping portion of each bottom wall plate and the slide plate is for preventing slippage and ensuring sealing performance. Forming wrinkle-shaped irregularities takes time and labor for manufacturing and assembling the wall plate portion, and the number of parts is large, resulting in an increase in cost. Also, in this device, when the pulley shaft supporting position for supporting the conveyor belt is lowered downward, the downward movement width is limited, and a sufficient space is provided between the circular orbit of the bucket tip and the extension of the conveyor belt. There has been a problem that the range of downward movement when setting the position of the bottom wall is small and it is not possible to maintain a sufficient interval. further,
In this device, as shown in FIG. 11, as the bottom wall of the three divisions is shifted downward, the curvature shape of the curve is different between the bottom wall portion and the central wall portion at both ends, and the curved shape along the circular trajectory of the tip of the bucket is set. There was a problem that the bottom wall shape was greatly distorted and the interval adjustment itself could not be performed smoothly.

The present invention has been made in view of the above problems, and an object thereof is to facilitate manufacture and assembly with a simple structure and to seal the inner wall of the casing and the bottom of the casing even by vertical movement. It is an object of the present invention to provide a bucket conveyor device capable of stably adjusting the vertical movement of the casing bottom without impairing the property. Another object of the present invention is to provide a bucket conveyor device that can move up and down in a stepless manner without changing the curved shape of the bucket tip along the rotational trajectory. Further, another object of the present invention is to simplify the structure by simultaneously performing the separation drive with respect to the inner wall of the casing, the vertical drive, and the support of the entire bottom portion, and the vertical movement operation from the operation port of the casing or the like. It is an object of the present invention to provide a bucket combing device having practicality that can easily perform the above.

[0007]

In order to achieve the above-mentioned object, the present invention provides a conveyed article M loaded in the bottom of a casing.
In a bucket conveyor that scoops with a bucket traveling in the vertical direction and conveys the bucket upward, the casing bottom is
It is provided so as to close the inside of the casing 10,
Further, it is composed of a bottom unit 18 which is arranged so as to be curved downward in an arc shape with a gap from the inversion orbit of the bucket 16 in the vicinity of the bottom of the casing, and which is mounted so as to be vertically movable in the casing as a whole. The unit includes split bottom plates 22 pivotally connected to each other, and curved end edges of the bottom unit 18 closely contact the inner wall of the casing that faces them, and support the split bottom plate from below so that the bottom unit 18 can be driven to be separated and opened. The bucket conveyor device includes a support mechanism 20 that moves up and down.

At this time, the bottom unit 18 is formed in a rectangular shape in plan view corresponding to the sectional shape of the casing 10, and at least one end of opposite end edges other than the curved end edges of the bottom unit is formed. A movable width plate 26 may be attached to the edge 100A so as to be movable back and forth in the width direction.

The divided bottom plate 22 has a central plate 22b,
Both end plates 22a pivotally connected to the central plate and the other end side thereof is curved and extended to the inner wall side of the casing.
22c, and the support mechanism 20 includes the casing 10
One end is fixed to the other end plate (22a, 2a, 2)
2c) including a first telescopic device (42) pivotally connected to the casing, and a second telescopic device (44) having one end fixed to the casing and the other end pivotally connected to the central plate 22b. Good.

Further, each expansion device (42, 44)
Is composed of a turnbuckle device in which the base portion is linked to the casing side by loose coupling, and is configured such that the peripheral edge of the bottom unit can be separated from the inner wall of the casing via a coupling portion 46 with the casing side on the base side. May be.

The bucket conveyor device according to claim 4, wherein the turnbuckle device is arranged in a vertical direction.

An air blaster 60 having a blaster nozzle 62 which is inserted from the outside of the bottom unit 18 and whose tip is bent along the curved inner wall surface of the bottom unit may be provided.

Further, the central plate 22b may be provided with an inspection port 25 for inspecting the inside of the bottom unit 18 from the outside.

[0014]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of a bucket conveyor device according to the present invention will be described in detail below with reference to the accompanying drawings. 1 to 5 show an embodiment of the bucket conveyor device according to the present embodiment. The bucket conveyor device is a conveyer for powder and granules containing soybeans, corn, millet, barley, and other grains, and in particular, for example, the powder and granules introduced from near the bottom inside a vertically arranged hollow casing are vertically long. It is a transfer device that scoops up by a bucket conveyor that is orbitally driven and transfers to another transfer process or the like.

FIG. 1 is a partial vertical cross-sectional explanatory view of the bottom portion of the bucket conveyor device. In FIG. 1, an upper drive sprocket fixed to an upper drive shaft (not shown) and a lower shaft 12 are fixed inside a casing 10. The conveyor chain 14 is provided so as to be orbitally driven by a lower sprocket (not shown) that is rotated in the longitudinal direction. A plurality of buckets 16 for scooping are connected to the conveyor chain 14 at regular intervals in series so that the bucket conveyor is orbitally driven while reversing the direction at the upper and lower ends.

A bottom unit 18 is provided on the bottom side of the casing 10 so as to laterally close the inside of the casing, and a support mechanism 20 for supporting the bottom unit 18 is provided.
Is installed on the lower side of the bottom unit 18. That is, the casing bottom of the bucket conveyor device is
It has a substantially U-shape which is curved in an arc shape and is spaced apart from the reversing orbit of the tip of the bucket 16 in the vicinity of the lower sprocket shaft 12 and is curved downward. It is composed of a bottom unit 18 attached to the.

The bottom unit 18 includes three divided bottom plates 22a, 22b and 22c, as shown in FIGS. In the embodiment, the split bottom plate includes a central plate 22b,
Both end plates 22a, 22c pivotally connected to the central plate via hinges 24 are provided, and the entire bottom unit is curved so as to follow the orbit of the bucket 16, as shown in FIG. For example, in the embodiment, the central plate 22b has a curved shape with the largest curvature, whereas the both end plates 22a and 22c have a straight plate shape or have a smaller curvature as compared with the central plate (in the figure, a straight plate shape is shown. However, it is preferable that it is formed with a curved surface to some extent).

Each of the divided bottom plates of the bottom unit is made of a metal such as a steel plate, and an inner surface of the casing 10 on the bottom side and an inner surface of the bottom unit 18 on the inner side of the casing are coated with an antistatic coating. Also, the bottom unit 1
Airtight packing 23 is applied to both curved end edges 220 and 222 of No. 8, respectively. Both end plates 22 of the bottom unit
Edges 220, 2 facing the inner wall of the casing a, 22c
Each of the units 22 merely abuts on the inner wall surface of the casing. Therefore, the bottom unit 18 is supported in a floating manner inside the casing by a support mechanism 20 described later. Central plate 22b and both end plates 22a, 22c
And are respectively rotatable via hinges. As shown in FIGS. 1 to 4, an inspection port device 30 having an inspection port 25 and a lid member 28 for opening and closing the inspection port 25 is provided on the central plate 22b of the divided bottom plate. Since the bottom unit 18 is supported in a floating state by the support mechanism 20, it is possible to set the central plate 22b wide, which allows the size of the inspection port 25 to be set large, so that the inspection, cleaning, and the like in the casing can be performed. It makes other maintenance easier.

As shown in FIGS. 2 to 4, the bottom unit 18 is formed in a rectangular plane projection shape corresponding to the sectional shape of the casing 10. The movable width plate 26 is attached to one of the opposite end edges other than the curved end edges 220 and 222 of the bottom unit 18 so as to be able to move back and forth in the width direction. In FIG.
The width of the three divided bottom plates 22a, 22b, 22c on the side surface of the U-shaped curve is narrower than the width space in the casing. And a state in which the movable width plate 26 is brought into close contact with the inner wall of the casing by the movement of the movable width plate 26 in the width direction, and a state in which a gap H is formed between the inner wall and the inner wall as shown in FIG. Can be selectively formed.

In detail, in FIG. 3, the movable width plate 26 is composed of three thin plate-shaped curved plates having the same curvature as that of the three divided plates of the divided bottom plate, and each of them is provided with a plurality of L-shaped grooves 28. Then, a fastening member such as a bolt is passed through these L-shaped grooves, and a hole provided on the side of the divided bottom plate is passed through and tightened to connect the divided bottom plates and the movable width plate in the width direction. By loosening the fastening member, the movable width plate 26 is moved to the gap H.
Can be moved toward the center in the width direction. A packing member is stretched over the end edge portion of the movable width plate 26, that is, the portion that contacts the inner wall of the casing, and ensures airtightness when contacting the inner wall. 32 in the figure
Is an opening / closing handle of the lid member 28, and 34 is a handle.
Reference numeral 36 denotes a flange provided by bending the movable width plate 26 in an L shape, and the flange 36 is provided via a flange and a jack bolt provided on the side of the split bottom plate 22 (not shown).
Is screwed and pushed, and the packing which is the seal portion of the movable width plate 26 against the wall surface of the casing in the installed state is pressed to keep airtightness.

On the other hand, a second width end edge 100B on the other end opposite to the first width end edge 100A, which is the side where the movable width plate of the split bottom plate 22 is attached, is provided with a bent flange (not shown). A packing as a sealing member is also stretched on the back surface side of this flange. This second width edge 100B
Is the moving width plate 26 and the respective divided bottom plates 22a to 22c.
When the support mechanism 20 and the casing are pivotally connected or loosely connected to each other, the fixed contact with the inner wall surface of the casing is released and the bottom unit as a whole comes into contact with the inner wall of the casing. It can be moved up and down in the released state.

1 to 4, the bottom unit 1
On the lower surface side of 8, there is provided a support mechanism 20 for supporting the entire bottom unit from below. This support mechanism 20
The curved bottom edges 220, 222 of the bottom unit 18 closely contact the inner wall of the casing facing them, and vertically drive the entire bottom unit 18 while supporting the split bottom plate 22 from below so that the split bottom plate 22 can be driven separately.

In FIG. 1, a casing 10
Operation ports 38 are respectively opened on opposite sides of the lower position where the bottom unit 18 is arranged, and a lid 40 is normally provided.
The work space S below the bottom unit is closed by a and 40b. In the embodiment, the support mechanism 20 includes a first turnbuckle device 42, one end of which is connected to the casing 10 with a loose connecting force and the other end of which is pivotally connected to either of the end plates 20a and 20c. One end is connected with a loose connecting force and the other end is the central plate 2
Second turnbuckle device 44 pivotally connected to 0b
And, including. In the embodiment, these first and second turnbuckle devices 42 and 44 are provided in pairs for the bottom surface side of the bottom unit for each one portion,
They are respectively arranged on the lower surface sides of the four corners of the bottom unit 18 in a plan view. For example, in FIG. 3, the first and second turnbuckle devices 42 and 44 with the lid 40a opened.
Are arranged on both sides in the work space S, and the operation port 3
It is set to a position where the operator can insert a hand and perform a grip operation from the position 8.

First and second turnbuckle devices 42, 4
Reference numeral 4 denotes an expansion / contraction device that connects the respective bases to the casing 10 side via a connecting portion 46 having a loose connecting force, and allows the peripheral edge of the bottom unit 18 to separate from the casing inner wall via the connecting portion 46. is there. In the first turnbuckle device 42, first and second long bolts 52 and 54 are threadedly connected to both sides of the buckle body 48, and the tip end side of the first long bolt 52 is left end at the first pivot portion 56. Board 2
The lower end side of the second long bolt 54 (base side of the turnbuckle mechanism) is loosely linked to the casing 10 via the loose connecting portion 46. That is, in FIG. 1 and FIG. 3, the second long bolt 5 serving as a locking bolt on the base side is attached to the mounting plate 50 fixed to the casing 10.
4 is attached in a loosely tightened state, so that the left end plate 22a of the split bottom plate is movably supported by the first turnbuckle device. As shown in FIG. 1, the first turnbuckle device 42 is arranged vertically in a substantially upright state with respect to the ground, extends from the operation port 38, grasps the buckle body 48 with both hands, and rotates. Divided bottom plate 22 of bottom unit 18 simply by moving
Driving is performed so that both curved end edges of the casing closely contact and separate from the casing inner wall facing them.

The second turnbuckle device 44 has the same structure as the first turnbuckle device 42, and has first and second long bolts 52 and 52 on both sides of the buckle body 48, respectively.
54 is screwed and connected, and the tip side of the first long bolt 52 is set to the second
The pivot portion 58 is pivotally attached to the central plate 22b, and the lower end side of the second long bolt 54 (base side of the turnbuckle mechanism) is loosely linked to the casing 10 via the loose coupling portion 58. In FIGS. 1 and 3, the second long bolt 54, which is a locking bolt on the base side, is loosely fastened to the mounting plate 51 fixed to the casing 10, and therefore the second turnbuckle device is installed. Four
The central plate 22b of the divided bottom plate is supported by 4 so as to be movable to some extent. The second turnbuckle device 44 is disposed obliquely, and similarly, it is possible to extend the hand from the operation port 38 and grasp the buckle body 48 with both hands to rotate it. The buckle body 4 of the second turn buckle device 44
When 8 is rotated in the pulling down direction of the central plate 20b, both end plates 20a and 20c connected to the central plate 20b are also pulled down at the same time.

These first and second turnbuckle devices 4
2, 44 are respectively arranged at the four corner positions of the bottom unit 18, and the whole bottom unit 18 moves up and down by the operation.

Further, as shown in FIGS. 1 and 4, the bottom unit 18 is provided with an air blaster 60 for injecting air along the curved inner wall surface of the bottom unit 18. In the embodiment, one operation port (see FIG.
Curved right end plate 20 of the bottom unit on the upper and right operation ports) side
In c, a blaster nozzle 62 is inserted so as to penetrate to the inside of the bottom unit, and the tip of the blaster nozzle 62 forms a bent portion 64 bent along the curved inner wall surface of the bottom unit. ing. In this way, since the tip of the blaster nozzle is bent along the inner wall surface of the divided bottom plate, air is reliably pumped along the curved inner surface,
It is possible to prevent transport residue of powdery or granular material. As shown in FIG.
The blaster nozzle has a three-dimensional triangular shape, has an elongated nozzle opening, and a partition plate 66 as an even air blowing portion is provided inside the blaster nozzle to divide the air flow direction evenly.

Next, the operation of the bucket conveyor device according to the embodiment will be described with reference to FIGS. When the gap between the inner surface side of the bottom unit 18 and the inversion orbit of the bucket 16 is normal, in FIG.
In the state where the bucket conveyor is orbitally driven for a long time in the vertical direction in 0, when the granular material M is charged into the casing from a charging port (not shown), the object to be transported falls on the upper surface of the bottom unit and is continuously operated. The bucket 16 is scooped up and conveyed inside the casing upward. When the inspection port 25 is opened and the air is blown from the air blaster 60 after the transportation is completed, the residue accumulated on the inner wall side of the bottom unit is completely discharged.

When the conveyor chain 14 is gradually extended by use and its circling end is lowered downward to adjust the gap with the inner surface of the bottom unit, first, the lid of the operation port 38 is opened to open the operation port 38. Via the divided bottom plate, the jack bolt as the pressing means that is pressed against the movable width plate is loosened. Next, the connecting bolts between the movable width plate 26 and the divided bottom plates 22a, 22b, 22c in FIG. 3 are loosened to move the movable width plate 26 to the divided bottom plate side, and for example, as shown in FIG. It is moved to such an extent that a gap is maintained between the packing attachment edge 26 and the packing attachment edge. At this time, since the loose coupling portions on the base side of the first and second turnbuckle devices 42, 44 loosely support the entire bottom unit 18 with some rattling, the first edge 1
00A moves away from the inner wall of the casing, and the packing adjusted therewith also moves away from the wall. At the same time, the second edge 100B also easily separates from the inner wall surface of the casing.

In this state, the buckle body 48 of the first turnbuckle device 42 of the pair of turnbuckle devices arranged on both sides of the operation port 38 is gripped and rotated by the left and right hands, respectively. To extend the length of. Then,
As shown in FIGS. 7 (a) and 7 (b), the curved end plates (only the left end plate 22a is shown in FIG. 7) of the split bottom plate are rotated toward the center side around the pivotal joint with the center plate. The end edges of the left and right end plates are separated from the inner wall of the casing, and the packings at the end edges of the both end plates are also separated from the inner wall of the casing. As a result, the loose coupling portions of the first and second turnbuckle devices 42 and 44 serve as the second opposing side of the mounting side of the movable width plate.
The end edge 100B is also separated from the inner wall of the casing, and the packing portion thereof is also separated, so that the entire bottom unit is completely floatingly supported by the support mechanism 20. Next, by grasping the buckle body of the second turn buckle device 44, as shown in FIG.
The buckle body is rotated in the direction of the arrow, that is, in the contraction direction of the turnbuckle device. As a result, the central plate 22
b is lowered downward, and at the same time, its both end plates 22a, 22c
Is also lowered downward (FIG. 8 (a)). Then, the vertical movement operation is set so as to properly maintain the interval between the inner surface side of the bottom unit 18 and the reverse orbit of the bucket 16. After the adjustment is completed, the first turnbuckle device 42 is contracted so that the curved edge is brought into contact with the inner wall of the casing, and the packing is hermetically sealed. Further, the movable width plate 26 is slid in the width direction from the side of the divided bottom plate 22 so that the first and second end edges 100A and 100B are brought into close contact with the opposing inner walls of the casing. In this embodiment, the jack bolts are screwed together to push the movable width plate toward the wall, and the bottom unit curved at a proper distance from the inversion track of the bucket is arranged and fixed in this embodiment. A chain line in FIG. 9 shows a state in which the bottom unit moves downward without changing the curved shape. In the above-described process, the operation ports are moved by alternately performing the operations from the operation ports on both sides facing each other for each process.

The bucket conveyor device of the present invention is not limited to the above-mentioned embodiments, and any modification may be made without departing from the essence of the invention described in the claims. For example, the number of divisions of the bottom unit may be pivotally connected to three or more.

[0032]

As described above, according to the bucket conveyor device of the present invention, it is easy to manufacture and assemble with a simple structure, and the vertical movement also impairs the sealing performance between the inner wall of the casing and the casing bottom. Without this, it is possible to adjust the vertical movement of the casing bottom stably. In addition, it is possible to move up and down in a stepless manner without changing the curved shape along the rotation trajectory of the bucket tip, and it is possible to perform fine adjustment of the distance between the reversing orbit of the bucket and the bottom unit, making it a practical bucket. A conveyor device may be provided. Further, the bottom unit as a whole can be supported at the same time as separating and driving from the inner wall of the casing, as well as vertically driving, the structure is simple, and vertical movement operation from the casing operation port etc. can be easily performed. Is.

[Brief description of drawings]

FIG. 1 is a vertical cross-sectional explanatory view of a partially omitted main part showing an embodiment of a bucket conveyor device according to the present invention.

FIG. 2 is a bottom view of the bucket conveyor device according to the embodiment of FIG.

FIG. 3 is an explanatory view of an internal mechanism in which an operation port portion of the bucket conveyor device according to the embodiment of FIG. 1 is sectioned.

FIG. 4 is a bottom-up view of the state where the movable width plate is moved in the state of FIG. 2;

FIG. 5 (a) is a side view of a partially omitted main part of the air blaster. (B) is a bottom view. (C)
[Fig. 4] is a sectional view taken along line AA of (a).

6 is an operation explanatory view of the bucket conveyor device according to the embodiment of FIG. 1 in a state where a lid member is opened.

7 (a) and 7 (b) are explanatory views of the operation of the turnbuckle device and the bottom unit of the embodiment.

FIG. 8A and FIG. 8B are explanatory views of the operation of the turnbuckle device and the bottom unit of the embodiment.

FIG. 9 is an explanatory diagram showing a state where the bottom unit is moved downward in the embodiment of FIG.

10 is an operation explanatory view showing a state where an air blaster applied to the embodiment of FIG. 1 is driven.

FIG. 11 is an explanatory view showing a vertically moving state of a conventional bottom plate.

[Explanation of symbols]

10 casing 14 Conveyor chain 16 buckets 18 Bottom unit 20 Support mechanism 22 split bottom plate 22a Left end plate 22b central plate 22c Right end plate 26 Moving width plate 38 Operation port 42 First turnbuckle device 44 Second turnbuckle device 46 Connection 48 buckle body 62 Air Blaster 64 bent section 100A First edge 100B Second edge

Claims (7)

[Claims] 1. A bucket conveyor for scooping up a conveyed object loaded in a casing bottom part by a bucket traveling in a vertical direction and conveying it upwards, wherein the casing bottom part is provided so as to close the inside of the casing, and The bottom unit is arranged in a curved shape in an arc shape with a gap from the inversion orbit of the bucket in the vicinity of the bottom of the casing and is spaced downward, and the whole bottom unit is attached so as to be vertically movable. A support mechanism that includes split bottom plates pivotally attached to each other, and curved end edges of the bottom unit are in close contact with the casing inner wall facing them, and vertically move the entire bottom unit while supporting the split bottom plate from below so as to be able to drive apart. Bucket conveyor device including. 2. The bottom unit has a rectangular planar projection shape corresponding to the sectional shape of the casing, and at least one of the opposite end edges other than the curved end edges of the bottom unit has at least one end edge. 2. The bucket conveyor device according to claim 1, wherein a movable width plate is attached so as to be movable back and forth in the width direction. 3. The split bottom plate includes a center plate and both end plates pivotally connected to the center plate and extending at the other end side toward the inner wall of the casing in a curving manner, and the supporting mechanism is a casing. A first telescopic device whose one end is fixed and whose other end is pivotally connected to either end plate, and a second telescopic device whose one end is fixed to the casing and whose other end is pivotally connected to the central plate. The bucket conveyor device according to claim 1 or 2, further comprising: 4. Each expansion / contraction device comprises a turnbuckle device in which a base portion is linked to the casing side by a loose connection, and the periphery of the bottom unit is separated from the inner wall of the casing through a connection portion with the casing side on the base side. The bucket conveyor device according to claim 3, wherein the bucket conveyor device can be disengaged. 5. The bucket conveyor device according to claim 4, wherein the turnbuckle device is arranged in a vertical direction. 6. An air blaster having a blaster nozzle, which is inserted from the outside of the bottom unit and whose tip is bent along the curved inner wall surface of the bottom unit, is provided. The bucket conveyor device described in. 7. The inspection opening for inspecting the inside of the bottom unit from the outside is provided on the center plate.
7. The bucket conveyor device according to any one of 1 to 6.