JP4045670B2 - Dust discharge chute - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a discharge chute for a granular material, and more particularly to a discharge chute for a granular material for dropping a granular material conveyed to a high place by a continuous unloader or the like and discharging it to a subsequent facility.
[0002]
[Prior art]
When the granular material conveyed to a high place by a continuous unloader or the like is dropped by gravity through the discharge chute and is discharged to the subsequent equipment, the inflow amount of the granular material charged into the discharge chute changes. Therefore, in the case of a cylindrical discharge chute as in the prior art, if the inflow amount is larger than the outflow amount, the granular material is clogged with the discharge chute.
[0003]
On the contrary, when the inflow amount is smaller than the outflow amount, the powder particles collide with the inner wall or the outlet of the discharge chute, which causes a problem that the discharge chute is easily damaged. That is, when the amount of inflow is smaller than the amount of outflow, the flow rate of the granular material in the discharge chute is the fastest in the free fall unless an external force is applied, and theoretically reaches the end velocity of the particles.
[0004]
Therefore, in this type of chute, in order to suppress the dropping speed of the granular material, the falling chute is dropped by alternately bending and connecting the discharge chute or providing a buffer plate in the discharge chute. I was slowing down.
[0005]
[Problems to be solved by the invention]
However, the conventional discharge chutes of granular material are not structured to suppress the falling speed by applying the granular material to the bent portions of the discharge chute or the buffer plate. It is not a solution.
In addition, since the flow of the powder particles is likely to stagnate at the contact portion or the buffer plate, there is a disadvantage that the frequency of the powder particles being clogged in the discharge chute increases.
[0006]
The present invention has been made in view of such circumstances, and even when the amount of the powder is changed, the powder is not clogged, and is not easily damaged by the drop collision of the powder. The purpose is to provide a discharge chute.
[0007]
[Means for Solving the Problems]
In order to achieve the above object, the present invention is a discharge chute that is formed in a double-pipe structure with an inner tube and an outer tube having a narrowed lower end opening, and in which a granular material is introduced from the upper end opening of the inner tube. The inner pipe and the outer pipe are partitioned in the vertical direction to form a plurality of pipes, and the inner pipes are formed at different heights for each of the formed pipes. And a communication port that communicates the inside of the inner pipe with the pipes.
[0008]
According to the present invention, the granular material introduced from the upper end opening of the inner tube is discharged from the lower end of the inner tube while forming a layer of granular material in the inner tube because the lower end of the inner tube is narrowed. The And if the quantity of the granular material thrown in increases, it will overflow in the pipe line from the communicating port formed in the position with the lowest height, and will be discharged | emitted from the lower end of a pipe line. Also at this time, since the lower end of the pipe is squeezed, the granular material is discharged in a state where a layer is formed in the pipe. Furthermore, when the granular material to be added increases, it overflows from the communication port of the next height to the pipe line. Accordingly, the charged granular material is discharged from the inner pipe, the first overflowed pipeline, and the next overflowed pipeline, and all are discharged while forming a layer. Thereby, even if the input amount of the granular material varies, clogging of the granular material does not occur, and damage due to the falling collision of the granular material is difficult.
[0009]
DETAILED DESCRIPTION OF THE INVENTION
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of a granular material discharge chute according to the present invention will be described below in detail with reference to the accompanying drawings.
FIG. 1 is a longitudinal sectional view showing an embodiment of a discharge chute for a granular material according to the present invention. The particulate discharge chute 10 is formed in a double tube structure mainly from an inner tube 12 and an outer tube 14 containing the inner tube 12.
[0010]
The inner tube 12 is provided with an upper flange 16 having an opening 16A through which powder particles are introduced at the upper end thereof, and a hopper 18 having an opening 18A through which the powder particles are discharged at the lower end thereof. The opening area of the lower end opening 18 </ b> A of the inner tube 12 is narrowed down to be about ½ of the radial cross-sectional area of the body portion of the inner tube 12. Thereby, since the discharge amount of the granular material discharged from the lower end opening 18A is regulated, the granular material charged from the upper end opening 16A of the inner tube 12 forms a layer in the inner tube 12, and this layer Is discharged from the lower end opening 18A.
[0011]
A donut-shaped space 20 is formed between the inner tube 12 and the outer tube 14, and the upper end of the outer tube 14 is bent at a right angle toward the inner tube 12 to close the upper end of the space 20. The Further, the lower end of the outer tube 14 is formed to be inclined toward the inner tube 12, and the area of the ring-shaped opening 20A formed at the lower end of the space 20 is smaller than the radial cross-sectional area of the body portion. Formed to be. And the lower flange 25 provided with the opening 25A where the lower end opening 18A of the inner pipe 12 and the lower end opening 20A of the pipe line 24 merge is provided at the lower end of the discharge chute 10.
[0012]
The space portion 20 formed between the inner tube 12 and the outer tube 14 is provided with a plurality of dividing plates 22, 22 that are partitioned in the vertical direction, and the space portion 20 is divided into a plurality of pipelines 24. For example, FIG. 2 shows a case where the space part 20 is divided into two pipe lines 24A and 24B, and FIG. 3 shows a case where the space part 20 is divided into four pipe lines 24A, 24B, 24C and 24D. The following description is for the two pipe lines 24A and 24B.
[0013]
As shown in FIG. 1, communication ports 26 </ b> A and 26 </ b> B that connect the inside of the inner tube 12 and the pipe lines 24 </ b> A and 24 </ b> B are formed in the inner tube 12. The communication port 26A communicating with the conduit 24A is formed at a high position of the inner tube 12, and the communication port 26B communicating with the conduit 24B is formed at a low position of the inner tube 12. As shown in FIGS. 1 and 4, inclined plates 28A and 28B extending from the communication ports 26A and 26B to the lower end openings 20A of the pipes 24A and 24B are provided in the pipes 24A and 24B. By the inclined plates 28A and 28B, the powder particles that have overflowed from the communication ports 26A and 26B are guided so as to slide on the inclined plates 28A and 28B and guided to the lower end opening 20A.
[0014]
Further, as shown in FIG. 5, the lower end of each communication port 26A, 26B formed in the inner pipe 12 is inclined upward in order to facilitate the flow of powder from the inner pipe 12 side to the ducts 24A, 24B. The protruding plate 30 is protruded.
And the discharge capacity of the granular material from the lower end opening 18A of the inner pipe 12, the discharge capacity of the granular material from the lower end opening 20A of the pipe line 24A, the discharge capacity of the granular material from the lower end opening 20A of the pipe line 24B. The total is set so as to be larger than the maximum input amount supplied from the upper end opening 16 </ b> A of the inner pipe 12.
[0015]
Next, the action of the discharge chute of the granular material of the present invention configured as described above will be described.
Although the granular material thrown in from the upper end opening 16A of the inner tube 12 is discharged from the lower end opening 18A of the inner tube 12, the lower end opening 18A of the inner tube 12 is narrowed. Accumulate to form a layer. Therefore, after the granular material introduced from the upper end opening 16A of the inner tube 12 falls on the granular material layer, this layer moves and is discharged from the lower end opening 18A through the opening 25A. As a result, the granular material does not collide with the lower end opening 18 </ b> A of the inner tube 12 and is discharged from the lower end opening 18 </ b> A in a state where a layer of granular material is formed in the inner tube 12. At this time, the discharge speed of the powder particles discharged from the lower end opening 18A can be set to 1/3 or less of the discharge speed when the powder particles freely fall. Accordingly, the discharge chute 10 can be hardly damaged, particularly the lower end opening 18A.
[0016]
Next, when the input amount of the granular material is increased, the height of the layer of the granular material in the inner pipe 12 is gradually increased and overflows from the communication port 26B formed at a low position to the pipe line 24B. Since the lower end opening 20A of the pipe line 24B is narrowed down and the inclined plate 28B is provided in the pipe line 24B, the discharge amount is regulated. Therefore, the granular material that has flowed over the conduit 24B also forms a layer in the conduit 24B in the same manner as the inner tube 12, and this layer is discharged from the lower end opening 20A through the opening 25A while moving. Therefore, as in the case of the inner tube 12, the discharge chute conduit 24B is not easily damaged.
[0017]
Further, when the amount of the granular material to be charged increases, the granular material also overflows from the communication port 26A formed at a high position of the inner tube 12 to the conduit 24A. Also in this case, the granular material forms a layer in the conduit 24A as described above, and the layer is discharged from the lower end opening 20A through the opening 25A while moving. Accordingly, the conduit 24A of the discharge chute 10 is not easily damaged as described above.
[0018]
As described above, since the powder particles are discharged while moving in layers in the inner pipe 12 and the pipe lines 24A and 24B, the discharge chute 10 can be hardly damaged. In addition, when the input amount of the granular material to be input is small, the powder is discharged only from the inner pipe 12, and as the input amount increases, the increased amount of the granular material passes through the communication port 26 to the conduit 24. And is discharged from both the inner tube 12 and the conduit 24. Therefore, the discharge chute 10 is not clogged even if the input amount varies.
[0019]
In this case, the number of conduits 24 formed between the inner tube 12 and the outer tube 14 and the height of the communication port 26 are changed in accordance with the frequency and magnitude of variation in the amount of the charged granular material. Good. Further, as shown in FIG. 5, the protruding plate 30 provided at the lower end of the communication port makes it easy for the granular material to easily flow from the inner tube 12 side to the conduit 24.
[0020]
【The invention's effect】
As described above, according to the discharge chute of the granular material of the present invention, the discharge chute can be hardly damaged. Further, the discharge chute is not clogged even if the input amount varies.
[Brief description of the drawings]
FIG. 1 is a longitudinal sectional view showing an entire discharge chute of a granular material according to the present invention. FIG. 2 is a sectional view taken along line AA in FIG. 1, and a space portion between an inner tube and an outer tube. FIG. 3 is a cross-sectional view of the space between the inner tube and the outer tube divided into four. FIG. 4 is an explanatory view for explaining the guide plate. Explanatory drawing explaining the projection plate provided at the communication port of the discharge chute of powder
DESCRIPTION OF SYMBOLS 10 ... Discharge chute 12 ... Inner pipe | tube 14 ... Outer pipe | tube 16A ... Upper end opening of an inner pipe | tube (injection port of a granular material)
18A ... Lower end opening of inner pipe (powder outlet)
20 ... Space 20A ... Lower end opening of space (powder outlet)
22 ... Split plate 24 ... Pipe line 26 ... Communication port 28 ... Inclined plate 30 ... Projection plate

Claims (2)

A discharge chute that is formed into a double tube structure with an inner tube and an outer tube with a narrowed lower end opening, and that throws in powder from the upper end opening of the inner tube,
A dividing plate that vertically partitions between the inner pipe and the outer pipe to form a plurality of pipelines;
A granular material comprising: a communication port formed in the inner pipe by changing the height for each of the plurality of formed pipe lines, and communicating with the inside of the inner pipe and each of the pipe lines. Discharge chute.   The discharge chute for the granular material according to claim 1, wherein an inclined plate extending from the opening to the lower end opening of the pipe is provided in the pipe.

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