JP5614064B2 - Powder conveying device - Google Patents

Description

  The present invention relates to a powder conveyance device, and more particularly, to a powder conveyance device capable of preventing powder from staying in a hopper and preventing a decrease in conveyance efficiency.

  Conventionally, for example, in the powder conveying apparatus of Patent Document 1, as shown in FIG. 7, the hopper 201 has four side surfaces 222 to 225 constituting a peripheral wall (the side surface 222 and the side surface 224 are opposed to each other). Then, the side surface 223 and the side surface 225 face each other). Here, the side surfaces 223 and 225 are surfaces parallel to the belt conveyance direction, one side surface 225 is a vertical surface, and the other side surface 223 is an inclined surface (partly including a vertical surface). Further, the side surfaces 222 and 224 are surfaces positioned on the upstream side and the downstream side in the conveying direction of the belt conveyor 206, respectively, one side surface 224 is a vertical surface, and the other side surface 222 is an inclined surface (partially a vertical surface). Included).

  As shown in FIG. 7C, the side surface 223 that is an inclined surface has a stepped portion 217 in the vicinity of the belt conveyor, the upper side from the stepped portion 217 is an inclined surface 223a, and the lower side is a vertical surface 223b. ing. Similarly, as shown in FIG. 7A, the side surface 222, which is an inclined surface, also has an inclined surface 222a above the stepped portion 217 and a lower surface a vertical surface 222b.

JP-A-8-113287 (see FIG. 7)

  Generally, in a powder conveying device, on the downstream side in the conveying direction in the hopper, the powder conveyed to the downstream side collides with the powder falling by its own weight, the powder is consolidated and agglomerated, and the hopper is closed. Sometimes. In particular, in the case of the type shown in FIG. 7 described above, the horizontal cross-sectional area of the hopper is smaller below the stepped portion 217, and there is no space for releasing the powder pressure. And the hopper is likely to be blocked.

  In particular, in the case of a powder that easily aggregates, such as desalted dust (dust obtained by separating chlorine components contained in incinerated ash) used as a cement raw material, this problem becomes more significant.

  The present invention has been made in view of the above-described problems, and an object of the present invention is to provide a powder transport apparatus that can prevent powder from staying in the hopper and prevent a decrease in transport efficiency. It is in.

In order to achieve the above object, the powder conveying device of the present invention comprises:
A hopper having an upper end opening that opens to the vertical upper end and a lower end opening that opens to the vertical lower end;
A belt conveyor provided on the lower end side of the hopper;
With
In the powder conveying apparatus for dropping the powder supplied from the upper end side opening part onto the belt conveyor from the lower end side opening part, and conveying the powder by the belt conveyor,
The horizontal cross-sectional area of the hopper gradually decreases from the upper end side opening toward the lower end side opening,
An escape portion for reducing the pressure of the powder is provided on one or both of the two side surfaces of the hopper provided along the conveying direction of the belt conveyor.

  According to such a configuration, since a relief portion for reducing the pressure of the powder is provided in a part of the hopper, the powder is less likely to be consolidated and agglomerated, and the powder stays in the hopper. Can be prevented.

  As described above, according to the present invention, it is possible to provide a powder transport apparatus that can prevent powder from staying in the hopper and prevent a decrease in transport efficiency.

It is a three-plane figure of the powder conveying apparatus of one form of the present invention. It is a perspective view which shows typically the powder conveying apparatus of FIG. It is a perspective view which shows partially the lower part side of the hopper of FIG. It is a figure which shows typically a mode that powder moves in the hopper of FIG. It is a three-view figure of the other form of the powder conveying apparatus of this invention. It is a partial enlarged view of the lower end part of a hopper. It is a three-plane figure of the conventional powder conveying apparatus.

Hereinafter, an embodiment of the present invention will be described with reference to the drawings.
Unless otherwise noted in this specification, “upward” means vertically upward, and “downward” means vertically downward.

[First Embodiment]
The powder conveying apparatus 50 of this embodiment conveys powder, such as desalted dust, for example, and as shown in FIG. The belt conveyor 6 is provided.

  As an example, the belt conveyor 6 includes a pair of rollers 6a and 6b disposed at substantially the same height with a predetermined interval, and a belt 6c stretched between the rollers 6a and 6b.

  FIG. 2 is a perspective view schematically showing constituent elements of the powder conveying apparatus of FIG. As shown in the figure, the hopper 1 as a whole has a shape that sags downward, and has an upper end side opening 3 and a lower end side opening 4. The hopper 1 has four side surfaces 1A to 1D (the side surface 1A and the side surface 1C face each other, and the side surface 1B and the side surface 1D face each other).

  As shown in FIG. 1 (A), the hopper 1 has an upper hopper portion 21A that sinks downward from the upper end side opening 3, and a lower hopper portion 21B provided below the upper hopper portion 21A. . The lower hopper portion 21B further includes an upper intermediate hopper portion 31 and a lower take-out hopper portion 41. A boundary portion between the intermediate hopper portion 31 and the take-out hopper portion 41 is a step portion 17, and a boundary portion between the upper hopper portion 21A and the intermediate hopper portion 31 is a step portion 17 '.

The upper hopper portion 21A has four side surfaces 22 to 25 constituting a peripheral wall (the side surface 22 and the side surface 24 face each other, and the side surface 23 and the side surface 25 face each other). As shown in FIG. 1B, of the two side surfaces 23 and 25 provided along the conveying direction of the belt conveyor, one side surface 23 is an inclined surface and the other side wall 25 is a vertical surface. As shown in FIG. 1A, the side surfaces 22 and 24 on the upstream side and the downstream side in the conveyance direction of the belt conveyor are both inclined surfaces, and are inclined so as to be closer to each other in the lower part.
The arrangement position of the side surface 25 (vertical surface) will be described later with reference to other drawings.

FIG. 3 is a perspective view partially showing a lower side of the hopper 1 of FIG. 1.
As shown in the figure, the intermediate hopper 31 has an upper end opening 38 and a lower end opening 39. The shape of the upper end side opening 38 is a rectangle having the conveying direction of the belt conveyor 6 as its longitudinal direction, and the shape of the lower end side opening 39 is an isosceles trapezoidal shape having the conveying direction of the belt conveyor 6 as its height direction ( The upstream side corresponds to the upper bottom, and the downstream side corresponds to the lower bottom).

The intermediate hopper portion 31 has four side surfaces 32 to 34 constituting the peripheral wall thereof. Among these, the side surface 32 on the upstream side in the transport direction and the side surface 34 on the downstream side are both inclined surfaces, and are inclined so as to be closer to each other in the downward direction.
Both side surfaces 33 and 35, which are side surfaces along the conveying direction of the belt conveyor, are formed as bent surfaces. The side surface 33 will be described in detail by way of example. The side surface 33 is composed of two flat portions 33a and 33b having a triangular shape, and the long sides of the triangle are connected to each other and bent along the side. It is formed into a shape. The other side surface 35 is configured in the same manner.

  The reason why the side surfaces 33 and 35 are formed as such bent surfaces is to connect the upper end side opening 38 formed in a rectangular shape and the lower end side opening 39 formed in a trapezoidal shape. Since the side surfaces 33 and 35 having such a shape can be formed by, for example, bending a single flat plate at a predetermined angle along the diagonal line, there is an advantage that it is easy to manufacture.

  As shown in FIG. 3, the take-out hopper 41 below the intermediate hopper 31 has four side surfaces 42 to 45 that constitute a peripheral wall. The side surfaces 42 to 45 are all vertical surfaces, and are provided so as to extend downward from the lower edge portions of the side surfaces 32 to 35 of the intermediate hopper portion, respectively.

As is clear from FIG. 3, the region surrounded by the lower edges of the side surfaces 42 to 45 is the lower end opening 4. The shape of the lower end side opening 4 is a trapezoid that becomes wider toward the downstream side in the transport direction of the belt conveyor 6 as described above.
Note that the lower end opening 4 is not necessarily an isosceles trapezoid, and may be asymmetric with a center line L1 (see FIG. 1) parallel to the transport direction.

As shown in FIG. 1A, in the assembled state of the powder conveyance device 50, the lower end portion of the hopper 1 is in contact with the upper surface of the belt 6c so as not to hinder the movement of the belt 6c. Further, an extraction port 5 is formed near the lower end of the side surface 44 on the downstream side of the hopper 1, and the powder in the hopper 1 is carried out through the extraction port 5.
Although illustration is omitted, an upper limit level switch is provided in the vicinity of the upper end side opening 3 of the hopper 1 to prevent powder of the upper limit level or more from entering the hopper 1.

  As shown in FIGS. 1 and 3, in the present embodiment, the side surface 25 (vertical surface) is disposed at a position on the inner side (center side of the hopper) than the upper edge portion of the side surface 35 of the intermediate hopper 31 portion. ing. Thereby, the upper end side opening 38 is partitioned into two regions, and the escape portion 16 is formed in a region opposite to the inclined surface 23 (see FIG. 1) in the two regions.

  The escape portion 16 is a portion where the horizontal sectional area of the hopper 1 is partially enlarged, and is a structure portion for reducing the pressure of the powder. As shown in FIG. 3, the escape portion 16 is provided as an opening portion that opens upward. Specifically, the opening portion includes a lower edge portion of the side surface 25 and a side surface 35 that is parallel to the lower edge portion. The upper edge portion is defined by a part of the upper edge portion of the side surface 32 and a part of the upper edge portion of the side surface 32.

  The powder conveying apparatus 50 configured as described above can be used in the same manner as a conventional one. That is, as shown in FIG. 4, the powder put into the hopper 1 from the upper end side opening 3 of the hopper 1 is extracted from the lower end opening 4 side of the hopper 1 by driving the belt conveyor 6. The conveyor 6 can be conveyed downstream in the conveying direction.

As described above, the powder conveyance device of the present embodiment is
(1) a hopper 1 having an upper end side opening 3 that opens to the vertical upper end side and a lower end side opening 4 that opens to the vertical lower end side;
A belt conveyor 6 provided on the lower end side of the hopper 1,
With
In the powder conveying device 50 that drops the powder supplied from the upper end side opening 3 onto the belt conveyor 6 from the lower end side opening 4, and conveys the powder by the belt conveyor 6,
The horizontal cross-sectional area of the hopper 1 gradually decreases from the upper end side opening 3 toward the lower end side opening 4,
An escape portion 16 for reducing the pressure of the powder is provided on one or both of the two side surfaces 1B and 1D of the hopper provided along the conveying direction of the belt conveyor 6. And

In the present specification, when a hopper whose horizontal cross-sectional area is “gradually reduced” from the upper end side opening toward the lower end side opening, a part of the hopper portion 41 as shown in FIG. In this case, those having a constant cross-sectional area are also included.
In the above-described embodiment, an example in which one escape portion 16 is formed on the side surface 25 side has been described. However, the present invention is not limited thereto, and another escape portion may be formed on the side surface 23 side.

According to such a configuration, the following operational effects can be obtained.
In the case of a conventional hopper in which the escape portion 16 is not provided (see, for example, FIG. 7), compaction and agglomeration are likely to occur as the powder falls in the hopper, and on the lower side of the hopper 1 (further downstream in the transport direction). On the side), there was a problem that powder clogging was likely to occur. On the other hand, by providing the escape portion 16 for reducing the pressure of the powder in a part of the hopper 1 as in the present embodiment, the powder is less likely to be consolidated and agglomerated, and the hopper 1 is blocked. Can be prevented.

In the powder conveyance device of this embodiment,
(2) One of the two side surfaces is a vertical surface, and the other is an inclined surface inclined with respect to the vertical direction,
The inclined surface gradually approaches the vertical surface toward the lower vertical side.
Even in the hopper having such a shape, the same effect as described above can be obtained.

In the powder conveyance device of this embodiment,
(3) The inclined surface has a stepped portion 17;
The upper side of the stepped portion 17 is inclined with respect to the vertical plane,
The lower side of the stepped portion 17 is parallel to the vertical plane.
According to such a configuration, since the upper side of the stepped portion 17 is the inclined surface (35), it is easier to secure the escape portion 16 as in the present embodiment than in the case where the stepped portion 17 is not provided. Moreover, since the side surface is formed as a vertical surface below the stepped portion 17, the powder is more easily consolidated in such a portion, and thus the effect (1) becomes more remarkable.

[Second Embodiment]
FIG. 5 is a three-sided view schematically showing the configuration of the powder conveyance device of the second embodiment.
This powder conveying apparatus is a powder conveying apparatus according to the present invention using an existing general-purpose hopper.

  In FIG. 5C, the hatched portion is a concrete structure 70 that constitutes an existing hopper. Inside the concrete structure 70, there are provided a hopper portion 71 into which powder is charged and a housing portion 77 provided below the belt conveyor 6 and disposed therein.

  The hopper portion 71 includes a vertical portion 72 surrounded by a vertical side surface, and an inclined portion 73 that is provided below and swells downward. An opening 75 at the lower end of the hopper portion 71 opens into the housing portion 77, whereby the powder from the hopper portion 71 is supplied into the housing portion 77. The contour of the opening 75 is defined by a part of the concrete structure 70, and the contour shape is rectangular as shown in FIG.

  In the accommodating portion 77, an intermediate hopper portion 131 having a structure similar to that of the first embodiment and an extraction hopper portion 141 below the intermediate hopper portion 131 are disposed, and these constitute a lower hopper portion 121B. The opening on the upper end side of the intermediate hopper 131 matches the size of the opening 75.

  As shown in FIG. 5, in this hopper part 71, the vertical side surface 125 is comprised by inserting a board | plate material to a perpendicular direction. As shown in FIG. 5A, the outline shape of the plate member (125) is a substantially downward trapezoidal shape as an example. An escape portion 116 is formed in the vicinity of the lower end of the side surface 125, whereby the same function and effect as in the above embodiment can be obtained.

In this example, the side surfaces 122, 123, and 124 are configured by inserting three plate members into the hopper portion 71 of the concrete structure 70. These side surfaces 122, 123, and 124 correspond to the side surfaces 22, 23, and 24 of the first embodiment, respectively. As shown in FIG. 5B, the hopper 101 is constituted by these side surfaces 122 to 124 and the vertical side surface 125 described above.
Note that the side surfaces 122 to 124 made of three plates may not be provided.

The powder conveying device of this embodiment is
(4) further comprising a second hopper (71) different from the hopper,
The horizontal cross-sectional area of the second hopper (71) gradually decreases from the vertically upper side to the vertically lower side,
The second hopper (71) includes an opening 75 for supplying the powder onto the belt conveyor 6,
The vertical surface (125) is formed by a plate inserted inside the second hopper (71),
The opening 75 is divided into two regions by the plate (125),
The escape portion 116 is a region on the opposite side to the inclined surface (123) of the two regions.
According to such a configuration, it is possible to obtain a hopper shape that matches the properties of the powder while utilizing the already existing second hopper (71). Further, the relief portion 1169 can be formed and the hopper shape can be changed simultaneously by simply inserting the plate.

In addition, the powder conveyance device of the present embodiment is
(5) further comprising a second hopper (71) different from the hopper,
The horizontal cross-sectional area of the second hopper (71) gradually decreases from the upper end side opening toward the lower side,
The second hopper (71) includes an opening 75 for supplying the powder onto the belt conveyor 6,
One or both of the two side surfaces are formed by a plate inserted inside the second hopper,
The opening 75 is divided into a plurality of regions by the plate,
The escape portion 116 is formed in a region on the opposite side to the center in the width direction of the belt among the plurality of regions.
Even with such a configuration, the side surfaces 122 to 124 are formed by inserting a plurality of plate materials while utilizing the already existing second hopper (71), and a hopper shape that matches the properties of the powder is obtained. Can do. In addition, the escape portion 116 can be formed and the hopper shape can be changed at the same time by simply inserting the plate.

In the powder conveying device of the present invention,
(6) When the belt width direction of the belt conveyor 6 is defined as a lateral direction,
The lateral width of the lower end side opening 4 gradually increases in the transport direction, and the vertical vertical sectional area of the hopper 1 gradually increases in the transport direction.
According to such a configuration, by increasing the volume at the end of the hopper in the belt conveyance direction, the powder pressure due to the collision between the powders is reduced, and the powder agglomerates at the end of the hopper in the belt conveyance direction.・ Residence can be reduced.

  In the above embodiment, the lower end portion of the plate material (side surface 125) of FIG. 5 may be inserted to the inside of the intermediate hopper 131, for example.

Other Embodiment
As shown in FIG. 6, the sliding part 20 may be provided in the lower end part of the hopper. This sliding part 20 is comprised with the rubber-made belt as an example. The sliding portion 20 is in sliding contact with the upper surface of the belt 6c of the belt conveyor 6 and prevents the powder from leaking from the hopper 1 to the outside.

  The means for fixing the rubber belt is not particularly limited. For example, the rubber belt may be fixed by a flat bar 65 that holds the rubber belt from the outside, a bolt 66a and a nut 66b. The bolt 66a has its head located inside the hopper 1 and a threaded portion passed through a hole formed in each of the side surface 22 (one example) of the hopper, the sliding portion 20, and the flat bar 65. Yes. The sliding portion 20 is attached to the side surface 22 by tightening the nut 66b outside the hopper 1. In addition, although the example in which the sliding part 20 is provided in the side surface 22 is shown in FIG. 6, such a sliding part may be provided in another side surface.

  As described above, providing the flexible member for preventing the conveyed object from leaking from between the hopper 1 and the belt conveyor 6 at the lower end of the hopper 1 assumes powder as the conveyed object. This is particularly effective in the present invention.

The powder conveying apparatus of the present invention is not limited to the above-described form, and can be variously changed.
For example, the lower end side opening 4 may have any shape that widens toward the downstream side, and may be, for example, a triangle, a trumpet shape, or a bell shape.

  Moreover, the side surface (side surface 25 in FIG. 1) provided above the escape portion 16 may be provided as an inclined surface instead of a vertical surface. This is because even if the side surface is inclined, if the escape portion 16 is provided, it is possible to obtain the same operational effects as in the above embodiment.

DESCRIPTION OF SYMBOLS 1 Hopper 1A Side surface 1B Side surface 1C Side surface 1D Side surface 3 Upper end side opening part 4 Lower end side opening part 5 Outlet 6 Belt conveyor 6a Roller 6b Roller 6c Belt 16 Escape part 17 Step part 17 'Step part 20 Sliding part 21A Upper hopper Part 21B Lower hopper part 22 Side face 23 Side face 24 Side face 25 Side face 31 Intermediate hopper part 32 Side face 33 Side face 33a Flat part 33b Flat part 34 Side face 35 Side face 35a Flat part 35b Flat part 38 Upper end side opening part 39 Lower end side opening part 41 Extraction hopper Part 42 Side 43 Side 44 Side 45 Side 50 Powder conveying device 65 Flat bar 66a Bolt 66b Nut 70 Concrete structure 71 Hopper part 72 Vertical part 73 Inclined part 75 Opening part 77 Housing part 101 Hopper 116 Escape part 121B Lower hopper part 122 Side surface 123 Side surface 124 Side surface 125 Side surface 131 Intermediate hopper 141 Unloading hopper

Claims (5)

It has an upper end side opening portion that opens to the vertical upper end side and a lower end side opening portion that opens to the vertical lower end side, and the horizontal sectional area gradually decreases as a whole from the upper end side opening portion to the lower end side opening portion, And a hopper having a part where the horizontal cross-sectional area partially expands as a relief part for reducing the pressure of the powder ,
A belt conveyor provided on the lower end side of the hopper;
With
In the powder conveying apparatus for dropping the powder supplied from the upper end side opening part onto the belt conveyor from the lower end side opening part, and conveying the powder by the belt conveyor,
As the escape portion for reducing the pressure of the powder, the expanding portion is provided on one or both of the two side surfaces of the hopper provided along the conveying direction of the belt conveyor. A powder conveying device. The powder conveying apparatus according to claim 1, wherein the expanding portion is provided as an opening that opens upward . In the powder conveying apparatus according to claim 1 or 2 ,
One of the two side surfaces is a vertical surface, and the other is an inclined surface inclined with respect to the vertical direction,
The powder conveying apparatus according to claim 1, wherein the inclined surface gradually approaches the vertical surface toward a vertically lower side. In the powder conveying apparatus according to claim 3 ,
The inclined surface has a step,
The upper side of this step is inclined with respect to the vertical plane,
The powder conveying apparatus characterized in that the lower side of the step portion is parallel to the vertical plane. In the powder conveying apparatus according to any one of claims 1 to 4 ,
When the belt width direction of the belt conveyor is defined as a lateral direction,
The lateral width of the lower end side opening gradually increases toward the transport direction,
The powder conveyance device according to claim 1, wherein the horizontal cross-sectional area of the hopper gradually increases in the conveyance direction.

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