Conveying chute

Abstract

To provide a conveying chute for restraining abrasion or damage of a chute body by falling of a conveying object.SOLUTION: A transport chute 10 of the present invention includes a tubular chute body 12 having upper and lower openings and configured to cause a transport object to fall from an upper opening side 12a and discharge the transport object from a lower opening side 12b, wherein the chute body 12 is provided with a recessed portion 20 that is inclined with respect to a vertical direction between the upper and lower openings and in which a part of the transport object is accumulated and covered on a bottom surface side 12c on which the transport object slides down, and the recessed portion 20 is attached to a part of the bottom surface side 12a where the transport object is the longest when directly falling from the upper opening side 12c toward the bottom surface side 12c.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to a conveying chute that can be applied to a conveyor for conveying biomass fuel used in power plants and boiler facilities in particular. [Background technology]

[0002] Conveyors are used to transport granular materials such as coal and wood pellets for fuel in facilities such as thermal power plants and boilers. In recent years, biomass fuels obtained from plants have come into use as a substitute for coal. One type of biomass fuel is palm kernel shell (PKS), which is the shell of the palm fruit kernel produced as a by-product in the palm oil production process. It has properties such as high energy efficiency, produces little ash when burned, and emits less carbon dioxide than fossil fuels.

[0003] When transporting such items by conveyor, a transfer chute may be installed between the upper and lower conveyors depending on the layout of the facility. The transfer chute ejects items that fall from the upper conveyor onto the lower conveyor. The chute disclosed in Patent Document 1 has weir members, flat surfaces, etc. installed on the floor of the chute unit, so that before the transported goods fall into the chute section, they fall into an impact reduction section where some of the goods accumulate, thereby reducing and protecting the chute section from the impact that occurs there compared to if the goods were to fall directly into the chute section. However, the aforementioned PKS is harder than coal and wood pellets, and if it falls directly over a long distance, the floor surface may be worn or damaged, which may not be suppressed by the impact reduction unit using the dam member disclosed in Patent Document 1. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Patent No. 7262525 Summary of the Invention [Problem to be solved by the invention]

[0005] In view of the problems of the prior art described above, the problem to be solved by the present invention is to provide a conveying chute that suppresses wear or damage to the chute body due to the falling of conveyed objects. [Means for solving the problem]

[0006] As a first means for solving the above problems, the present invention provides a chute having a cylindrical body with upper and lower openings, through which an object to be conveyed falls and is discharged from the lower opening, The chute body is provided with a recessed portion on a floor surface between the upper and lower openings that is inclined with respect to the vertical direction and through which the conveyed objects slide down, the recessed portion being covered by a portion of the conveyed objects; The object of the present invention is to provide a conveying chute characterized in that the recessed portion is attached to a part of the floor surface that is the longest distance over which the conveyed object falls directly from the upper opening onto the floor surface. According to the first means described above, the floor surface, which is the longest distance that the transported item falls directly from the upper opening to the floor surface, has traditionally suffered significant wear or damage (such as perforations) when transporting items with high hardness such as PKS.However, the depression in which some of the transported item accumulates suppresses wear or damage to the floor surface, reducing deterioration over time and expecting a longer lifespan and fewer maintenance sessions.

[0007] As a second means for solving the above-mentioned problems, the present invention provides a conveying chute according to the first means, characterized in that the chute body has a plurality of baffle plates arranged in parallel along the direction in which the conveyed objects fall, the baffle plates extending in a direction intersecting the main surface of the floor and collecting a portion of the conveyed objects as they slide down. According to the second means, when the transported object falls directly or slides down, part of the transported object accumulated on the baffle plate acts as a buffer to reduce the impact. In addition, by suppressing or slowing down the speed increase due to the weight of the transported object when it slides down, the progression of sliding wear can be prevented.

[0008] As a third means for solving the above-mentioned problems, the present invention provides a conveying chute according to the second means, characterized in that the chute body has a plurality of convex portions on the floor surface that assist in the accumulation of the conveyed materials. According to the third means, the objects to be conveyed can be easily caught on the convex portions, and the floor surface can be easily covered with the objects to be conveyed. In addition, some of the objects to be conveyed can be easily accumulated between the baffles, and even if the accumulated objects collapse due to the impact of being dropped, they can be easily restored.

[0009] As a fourth means for solving the above problem, the present invention provides a conveying chute which is any one of the first to third means and is characterized in that the recessed portion has multiple recesses arranged in parallel along the falling direction of the conveyed object. According to the fourth means, the amount of outward protrusion (protrusion) of the chute body is reduced compared to the amount of protrusion of a single recess, thereby suppressing interference with the outside. The amount of material accumulated in each recess is reduced compared to the amount of material accumulated in a single recess, making it easier for materials to accumulate. Furthermore, the amount of material accumulated in each recess can be reduced, while ensuring a wide opening area for the entire recess. Some of the material tends to accumulate in the recess, and even if the accumulated material collapses due to the impact of a fall, it can easily recover by collecting and returning to its original state.

[0010] As a fifth means for solving the above-mentioned problems, the present invention provides a conveying chute according to any one of the first to third means, characterized in that the recessed portion has a working handle attached to its outer surface so that it can be attached and detached from the outside of the floor surface of the chute body. According to the fifth aspect, maintenance of the recess and the inside of the chute body can be easily performed, and conveyed objects accumulated in the recess can be easily removed. [Effects of the Invention]

[0011] According to the present invention, wear or damage to the portions of the chute body that are subject to large impacts due to the falling of hard objects can be effectively suppressed. [Brief explanation of the drawings]

[0012] [Figure 1] 1A and 1B are a side view and a partial cross-sectional view of a conveying chute according to the present invention, respectively; [Figure 2] 1 is a perspective view (partially see-through) of a conveying chute according to the present invention, seen from above. [Figure 3] (1) A side view of the recessed portion, and (2) a perspective view from above. [Figure 4] FIG. 2 is a partially enlarged view of a baffle plate; [Figure 5] FIG. [Figure 6] 1A and 1B are a side view and a perspective view, respectively, of a recessed portion of a modified example, and a top view of the recessed portion of a modified example. DETAILED DESCRIPTION OF THE INVENTION

[0013] DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the conveying chute of the present invention will be described in detail below with reference to the drawings.

[0014] [Transport chute 10] Fig. 1 shows (1) a side view (excluding baffles) and (2) a partial cross-sectional view of the side of a conveying chute of the present invention. Fig. 2 is a perspective view (partially see-through) of the conveying chute of the present invention (excluding baffles). As shown in the figure, the conveying chute 10 of the present invention includes a cylindrical chute body 12 having upper and lower openings, through which conveyed objects drop through the upper opening 12a and are discharged through the lower opening 12b. The chute body 12 is provided with a recessed portion 20 on a floor surface 12c that is inclined with respect to the vertical direction between the upper and lower openings and through which the conveyed objects slide down, and which is covered by the recessed portion 20. The recessed portion 20 is attached to a portion of the floor surface 12c that corresponds to the longest distance over which the conveyed objects will fall directly from the upper opening 12a toward the floor surface 12c.

[0015] (Chute body 12) The chute body 12 has openings at the top and bottom, with the upper opening 12a being wider than the lower opening 12b. The chute body 12 shown in Figures 1 and 2 consists of a first chute section 12d with an upper opening 12a and a second chute section 12e with a lower opening 12b. The first chute section 12d widens from its connection with the lower second chute section 12e toward the upper opening 12a, with each side sloping. The second chute section 12e is a cylindrical member with a rectangular cross section, with its connection with the upper first chute section 12d and its lower opening 12b identical in shape. The floor 12c is the surface along which the transported objects slide down. Looking into the interior of the chute body 12 through the upper opening 12a, the upper portion of the chute body 12 can be seen above the sloping floor 12c of the second chute section 12e from its connection with the second chute section 12e. As a result, some of the transported objects that fall from the upper opening 12a collide with the inclined side surface of the first chute section 12d, while others collide with the inclined floor surface 12c of the second chute section 12e. The inclination angle θ of the floor surface 12c is set to an angle equal to or greater than the angle of repose β of the transported objects.

[0016] (recess 20) FIG. 3 shows (1) a side view of the recessed portion and (2) a perspective view from above. As shown in FIGS. 1 and 2, the recessed portion 20 is provided in the floor surface 12c between the upper and lower openings of the chute body 12, at an angle relative to the vertical, where the transported objects slide down. The recessed portion 20 has a generally concave, pocket-like shape with a downward-facing recessed portion 22 at the bottom. When some of the transported objects that fall from the upper opening 12a accumulate, the recessed portion 22 is covered with the transported objects. A handle 21 is provided on the outside of the recessed portion 20. The recessed portion 20 is detachably attached to an opening provided in a portion of the floor surface 12c and can be easily attached and detached using the external handle 21. In this embodiment, the recessed portion 20 is attached to a portion of the floor surface 12c that corresponds to the longest distance S when the transported objects fall directly from the upper opening 12a to the floor surface 12c (see (2) in FIG. 1). As a result, floor surface 12c, which is the longest distance S that the transported object falls directly from upper opening 12a to floor surface 12c, has traditionally been subject to significant wear or damage (such as perforations) when transporting hard objects such as PKS, but recessed portion 20, where some of the transported object accumulates and acts as a buffer, suppresses wear or damage to floor surface 12c, reducing deterioration over time and enabling a longer lifespan and fewer maintenance sessions. In addition, recessed portion 20 has baffle plates 30, which will be described later, attached to the upper and lower ends of the opening of recess 22.

[0017] (Baffle plate 30) FIG. 4 shows (1) a perspective view of a baffle plate and (2) a partially enlarged side view. As shown, the baffle plates 30 are flat plates extending in a direction intersecting the main surface of the floor 12c of the chute body 12 and arranged in parallel along the direction in which the transported materials fall. A recess 32 formed between the top surface of the baffle plate 30 and the floor 12c accumulates materials that have fallen through the upper opening 12a or that have slid down the floor 12c. The angle of repose, which is the maximum angle of the slope that naturally forms when materials accumulate and accumulate in the recess 32, varies depending on the type of material. Therefore, the angle of repose β is determined once the material is determined. The attachment angle A of the baffle plate 30 relative to the floor 12c and the length M of the baffle plate 30 protruding from the floor 12c can be arbitrarily set based on the inclination, cross-sectional area, and length of the chute body 12, which are designed based on the transport volume, angle of repose, and specific gravity of the material. The angle of repose β of the materials accumulated in the recess 32 can be expressed as the angle between the diagonal line x and a horizontal line passing through the upper end of the lower baffle 30. The materials are deposited in the recess 32 along the diagonal line x. Therefore, the floor surface 12c below the diagonal line x passing through the upper end of the baffle 30 is covered with the materials. Also, a vertical line passing through the tip of the upper baffle 30 is defined as vertical line y. The intersection z of the vertical line y and the floor surface 12c is the point onto which the materials falling from the baffle 30 fall, and the floor surface 12c above this point is blocked by the baffle 30 and does not allow the materials to fall directly onto it. In this embodiment, the installation distance L between adjacent upper and lower baffles 30 is set to the maximum when the intersection z of the diagonal line x and the vertical line y is on the floor surface 12c. When the installation distance L is shorter than the maximum distance, the intersection z of the diagonal line x and the vertical line y is located inside the chute body 12, and there is no point on the exposed floor surface 12c that is not covered by the objects to be directly dropped or rubbed against, resulting in wear. When the installation distance L is longer than the maximum distance, the intersection z of the diagonal line x and the vertical line y is located outside the chute body 12, and there is a point on the exposed floor surface 12c that is not covered by the objects to be directly dropped or rubbed against, resulting in wear. Therefore, the installation distance L between the upper and lower baffle plates 30 of this embodiment is set to be equal to or shorter than the maximum distance.

[0018] (Protrusion 40) FIG. 5 is a perspective view of the protrusions 40. The chute body 12 is provided with a plurality of protrusions 40 on the floor surface 12c to assist in the accumulation of transported objects. For example, the protrusions 40 are formed by punching a flat plate 42 into a rectangular or wedge shape, protruding vertically from the main surface. The protrusions 40 are preferably shaped like a grater and fixed to the floor surface 12c. This makes it easier for the transported objects to be caught on the protrusions 40, making it easier to cover the floor surface 12c with the transported objects. Furthermore, some of the transported objects tend to accumulate between the baffles 30, and even if the accumulated transported objects collapse due to the impact of a fall, they can easily be restored to their original state.

[0019] (Variation) FIG. 6 shows (1) a side view and (2) a perspective view of a modified recessed portion. As shown, the modified recessed portion 20A has multiple recessed portions 22 arranged in parallel along the direction in which the transported objects fall (three recessed portions 22 are shown in the figure). Baffle plates 30 are attached between the top and bottom of the recessed portions 22 (four baffle plates 30 are shown in the figure). This reduces the amount of protrusion (protrusion) of the chute body 12 outward compared to the recessed portion 20 shown in FIG. 3, thereby suppressing interference with the outside. The amount of material accumulated per recessed portion 22 is reduced compared to the amount of material accumulated in the recessed portion 22 shown in FIG. 3, making it easier for the transported objects to accumulate. Furthermore, the amount of material accumulated per recessed portion 22 can be reduced, and the opening area of ​​the recessed portions 22 throughout the entire recessed portion 20A can be ensured to be large. Some of the transported objects tend to accumulate in the recessed portions, and even if the accumulated material collapses due to the impact of a fall, it can easily recover by collecting and restoring itself.

[0020] [Effect] The operation of the conveying chute of the present invention having the above-mentioned configuration will be described below. Depending on the conveyance volume, the materials fed from the upper conveyor into the upper opening 12a either slide along the side of the first chute section 12d and fall to the floor surface 12c of the second chute section 12e, or fall directly from the upper opening 12a to the floor surface 12c of the second chute section 12e. Materials like PKS, which are harder than coal or wood pellets, may wear or damage the floor surface if they fall directly from the upper opening 12a for a long distance. To address this issue, a recess 20 is attached to a portion of the floor surface 12c that corresponds to the longest distance the materials fall directly from the upper opening 12a to the floor surface 12c. This allows the materials accumulated in the recess 20 to act as a buffer, absorbing the impact of the falling materials. This reduces wear and damage to the floor surface, reducing deterioration over time and potentially extending the lifespan and reducing the frequency of maintenance. Additionally, multiple baffle plates 30, which extend in a direction intersecting the main surface of the floor surface 12c and collect some of the materials that slide down, are arranged in parallel along the direction the materials fall. Therefore, the objects sliding down the floor surface 12c slide down on the objects accumulated in the recesses 32 of the baffle plate 30, thereby suppressing wear or damage to the floor surface 12c. In addition, by suppressing or slowing down the speed increase due to the weight of the objects sliding down, the progression of sliding wear can be prevented.

[0021] The interval between adjacent upper and lower baffles 30 is set to be equal to or less than the maximum distance when an intersection point z between an oblique line x, which has the same inclination as the angle of repose β of the material to be conveyed with respect to a horizontal line passing through the upper end of the lower baffle 30, and a vertical line y passing through the upper end of the upper baffle 30 is on the floor surface 12c. Therefore, there is no portion on the exposed floor surface 12c that is not covered with the material to be conveyed where the material will directly drop or rub against it and become worn. The chute body 12 is provided with a plurality of protrusions 40 on which parts of the transported objects sliding down onto the floor surface 12c between adjacent baffles 30 are caught, covering the floor surface 12c between the baffles 30. This makes it easier for the transported objects to be caught on the protrusions 40, making it easier to cover the floor surface 12c with the transported objects. In addition, some of the transported objects tend to accumulate between the baffles 30, and even if the accumulated transported objects collapse due to the impact of falling, they can easily be restored to their original state. According to the present invention, wear or damage to the portions of the chute body 12 that are subject to a large impact when a hard object falls can be effectively suppressed.

[0022] Although the preferred embodiments of the present invention have been described above, the present invention is not limited to the above embodiments and various modifications can be made without departing from the spirit and scope of the present invention. Furthermore, the present invention is not limited to the combinations shown in the embodiments, but can be implemented in various combinations. [Explanation of symbols]

[0023] 10 Transport chute 12 Shooting body 12a Top opening 12b Lower opening 12c floor 12d First Chute 12e Second chute section 20,20A recess 21 Handle 22 recess 30 Baffle Plate 32 dent 40 Convex part 42 flat plate θ Tilt angle β angle of repose S Maximum distance A Mounting angle M protrusion length x diagonal line z intersection y vertical line L Mounting distance

Claims

1. a cylindrical chute body having upper and lower openings, through which the transported object falls from the upper opening and is discharged from the lower opening; The chute body is provided with a recessed portion on a floor surface between the upper and lower openings that is inclined with respect to the vertical direction and through which the conveyed objects slide down, the recessed portion being covered by a portion of the conveyed objects; The conveying chute is characterized in that the recessed portion is attached to a part of the floor surface that is the longest distance over which the conveyed object falls directly from the upper opening onto the floor surface.

2. 2. The conveying chute according to claim 1, The chute body is characterized in that a plurality of baffle plates extend in a direction intersecting the main surface of the floor surface and are arranged in parallel along the falling direction of the transported objects, and a portion of the transported objects slide down and accumulate.

3. The conveying chute according to claim 2, The chute body is characterized in that a plurality of protrusions are provided on the floor surface thereof to assist in the accumulation of the transported objects.

4. The conveying chute according to any one of claims 1 to 3, The conveying chute is characterized in that the recessed portion has recesses arranged in parallel in multiple stages along the falling direction of the conveyed objects.

5. The conveying chute according to any one of claims 1 to 3, The recessed portion has an outer surface on which a handle for use is attached so as to be detachable from the outside of the floor surface of the chute body.

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