JP6770248B2 - Dust reduction chute - Google Patents

Description

The present invention particularly relates to a dust generation reduction chute that reduces dust generation when dry crushed powder or granular material falls from a connecting portion of a conveyor or the like.

The powder or granular material generated in the dry crushing step becomes fine particles when crushed or dropped, floats in the air, and diffuses to the surroundings. This dust is a fine particle of crushed stone, and the amount of scattering must be kept to a minimum in consideration of the health of workers and the influence of the surrounding environment.

Conventionally, various techniques for preventing such dust generation have been disclosed.
The crushing plant vehicle disclosed in Patent Document 1 has a dust-proof cover that covers the transport path of the conveyor, a nozzle that injects water inside the dust-proof cover, and a dust collector connected to the dust-proof cover to prevent the scattering of dust generated during transport. are doing.
The wet dust collector disclosed in Patent Document 2 includes a suction pipe for sucking air mixed with dust from a dustproof cover of a conveyor and a wet pipe for stirring and mixing dust with sewage, and returns purified air to the dustproof cover in the conveyor. Is purifying.

The dust scattering prevention cover disclosed in Patent Document 3 is formed along a transfer path of a transfer conveyor, and has a partially wide cross-sectional area in a direction orthogonal to the transfer direction of the transfer conveyor.
The dust generation suppression method disclosed in Patent Document 4 suppresses dust generation by supplying bubbles from the lower side having a large amount of powder in the powder or granular material falling from the conveyor.

JP-A-7-96209 Japanese Unexamined Patent Publication No. 2001-327825 Japanese Patent No. 5879423 Japanese Patent No. 5644582

However, the crushing plant vehicle of Patent Document 1 requires a dust collector and water injection water supply / drainage equipment for dust prevention, and has a problem that the equipment becomes large and the equipment cost increases.
Further, the dust collector of Patent Document 2 has a problem that it is difficult to control the wetting. This is because the amount of pulverization generated is not constant, and the amount of dust generated changes depending on the transportation conditions.

Further, the dust scattering prevention cover of Patent Document 3 can prevent dust scattering on the conveyor. However, the effect of preventing scattering cannot be expected against the dust generated when the stone is dropped and supplied onto the conveyor from a stone crusher, a hopper, or the like. Further, the dust generation suppressing method of Patent Document 4 uses bubbles having a small amount of water. By using a surfactant, the viscosity becomes higher than that of water, and the powder or granular material is agglomerated by rolling during transfer. This agglomeration improves dust generation prevention and slipperiness on the conveyor. However, when the amount of water increases, the viscosity of the foam increases the adhesiveness, which may cause inconvenience in transportation, and there is a problem that it is difficult to make adjustments for proper foam supply.

In view of the above problems of the prior art, an object of the present invention is to provide a dust generation reduction chute capable of reducing dust generation of powder or granular material falling from a conveyor with a simple configuration.

As a first means for solving the above problems, the present invention includes a dust generation reduction chute that receives the powder or granular material that falls during transportation, and includes a chute body that receives the powder or granular material on an inclined main surface. The shoot body is provided with a mixed portion of the powder and the granules contained in the powder or granular material .
The mixing portion is a bar screen provided with a plurality of slits along the longitudinal direction of the chute body.
The slit is composed of a first slit into which the powder falls and a second slit in which the granules fall, and the first slit is characterized in that the distance between the slits is set shorter than that of the second slit. The purpose is to provide a dust reduction chute.

The powder or granular material during transportation is in a state where the powder or granular material collects on the belt of the conveyor due to vibration, and the powder or granular material has a coarse particle size. If it falls in this state, the powder and the powder particles, which are heavy particles and whose falling speed has increased, contain air when they fall and collide with the floor surface together. At this time, the powder content of the powder or granular material is emitted to the surroundings together with the air due to the collision to generate dust.

According to the first means, since the chute body that receives the powder or granular material on the inclined main surface is provided with the mixing portion, the dropped powder content stays in the mixing portion and the powder or granular material is mixed. Since the falling speed and the collision force are reduced, the powder and the particles do not fall and collide at the same time to generate dust.

As a second means for solving the above-mentioned problems, the present invention is characterized in that, in the first means, the mixing portion is formed by bending the shoot body in a downward convex shape along the longitudinal direction. The purpose is to provide a dust generation reduction chute.
According to the second means, since the main surface of the chute body is curved into an R shape to keep the powder on the chute body, the mixing of the powder and the granules, the falling speed, and the collision force are reduced. Therefore, the powder and the granules do not fall and collide at the same time to generate dust.

As a third means for solving the above-mentioned problems, in the first means, the mixing portion is a plurality of pins protruding from the main surface of the chute body at a predetermined distance from each other. It is an object of the present invention to provide a dust generation reduction chute.
According to the third means, a plurality of pins protruding from the main surface are provided on the main surface of the chute body, and the powder does not flow along the main surface along the longitudinal direction but flows in the width direction of the main surface to form a granular material. Can be mixed with. As a result, the mixing of the powder and the granules, the falling speed, and the collision force are reduced, and the powder and the granules do not fall and collide at the same time to generate dust.

As a fourth means for solving the above-mentioned problems, the present invention is the first means, wherein the mixing portion is a bar screen provided with a plurality of slits along the longitudinal direction of the chute body. The slit is composed of a first slit into which the powder falls and a second slit in which the granules fall, and the first slit is characterized in that the distance between the slits is set shorter than that of the second slit. The purpose is to provide a dust generation reduction chute.
According to the fourth means, the powder content of the falling powder or granular material falls into the first slit, flows to the lower second slit along the main surface, and is mixed with the granules that have fallen into the second slit. It can be dropped from between the slits, degassed through the slits, the falling speed and collision force are reduced, and the powder and particles do not fall and collide at the same time to generate dust.

According to the present invention, since the chute body that receives the powder or granular material on the inclined main surface is provided with a mixed portion of the powder or granular material contained in the powder or granular material, the powder or granular material separated during transportation is provided. Since the falling speed and the colliding force are reduced, the powder and the granules do not fall and collide at the same time to generate dust.

It is a structural schematic diagram of the dust generation reduction chute of this invention. It is a structural schematic diagram of the dust generation reduction chute of the modification 1. FIG. It is a structural schematic diagram of the dust generation reduction chute of the modification 2. FIG. It is explanatory drawing of the powder / granular material being transported and the powder / granular material falling.

An embodiment of the dust generation reduction chute of the present invention will be described in detail below with reference to the accompanying drawings.
The dust generation reduction chute 10 of the present invention is intended to be attached to a crusher, a sieving machine, a discharge port such as a hopper, a connecting portion of a conveyor, a conveyor end, or other places where powder or granular material during transportation falls.
Further, the powder or granular material of the present invention is a mixture of powder or granular material, and the powder or granular material has a smaller particle size than the granular material and becomes dust when diffused.

[Dust generation reduction chute 10]
FIG. 1 is a schematic configuration diagram of a dust generation reduction chute of the present invention. As shown in the figure, the dust generation reduction chute 10 of the present invention includes a chute main body 12, and a mixing portion 20 is formed in the chute main body 12.
The width and length of the chute body 12 are set to be substantially the same as the width of the transport path, the length in the longitudinal direction is set to a length that can receive the falling powder or granular material, and the falling powder or granular material is set. It is a plate-shaped steel plate member set to a thickness having a predetermined strength that can withstand an impact at the time of collision.
The chute main body 12 is attached to a crusher, a sieving machine, a discharge port such as a hopper, a connecting portion of a conveyor, a conveyor end, or the like where powder or granular material being transported falls by inclining the main surface.

The chute body 12 is provided with a mixing section 20. The mixing portion 20 shown in FIG. 1 is formed by bending the chute main body 12 downward in a convex shape along the longitudinal direction. In such a side view, in the R-shaped mixing portion 20, the powder content 2 of the falling powder or granular material 1 falls above the chute main body 12, in other words, downward along the curved main surface of the transport path. Flow to. The lower part of the chute main body 12 is a place where the granular material 3 of the powder granular material 1 falls. Below the shoot body 12, the powder 2 that has moved from above stays and mixes with the fallen granules 3. The powder or granular material 1 in which the powder content 2 and the granular material 3 are mixed on the chute main body 12 falls to the floor surface or the like below.

[Action]
The operation of the dust generation reduction chute of the present invention according to the above configuration will be described below.
FIG. 4 is an explanatory diagram of the powder or granular material being transported and the powder or granular material falling. As shown in the figure, the powder or granular material 1 being conveyed by a conveyor or the like is in a state where the powder 2 is collected on the belt of the conveyor due to vibration, and the coarse particle 3 covers the powder 2. .. If it falls in this state, the powder content 2 and the powder or granular material 1 having an increased falling speed due to the heavy granular material 3 contain air when falling and collide with the floor surface together. At this time, the powder content 2 of the powder or granular material is emitted to the surroundings together with the air due to the collision to generate dust.
Generally, when the powder particles have the same particle size distribution and the same moisture content, the amount of dust generated is proportional to the amount of contained air, the amount of falling, the falling speed, and the collision force. Therefore, in order to reduce the amount of dust generated, it is necessary to remove the contained air, reduce the falling speed to prevent collision, and mix the powder and the granules.

The dust generation reduction chute 10 of the present invention has its main surface tilted at a place where powder or granular material being transported falls, such as a crusher, a sieve sorter, a discharge port of a hopper, a connecting portion of a conveyor, or a conveyor end. It is installed. The powder content 2 of the powder or granular material 1 that falls on the main surface of the dust generation reduction chute 10 falls above the chute main body 12 and flows downward along the curved main surface. The lower part of the chute main body 12 is a place where the granular material 3 of the powder granular material 1 falls. Below the chute body 12, the powder 2 that has moved from above along the main surface of the chute body 12 stays and mixes with the fallen granules 3. The powder or granular material 1 in which the powder content 2 and the granular material 3 are mixed on the chute main body 12 falls to the floor surface or the like below. Therefore, the powder and the granules do not fall and collide at the same time to generate dust.

[Modification 1]
FIG. 2 is a schematic configuration diagram of a dust generation reduction chute according to the first modification. As shown in the drawing, the mixing portion 20A of the dust generation chute 10A of the first modification adopts a plurality of pin 30 structures protruding from the main surface of the chute main body 12 at predetermined intervals on the main surface. The number of pins 30 installed and the arrangement interval can be arbitrarily changed depending on the content of the powder in the powder or granular material. For example, when the content of the powder is high, the number of pins 30 installed is increased and the arrangement interval is set narrow, so that the powder of the mixing portion 20A tends to stay. For attaching and detaching the pin 30, for example, a structure in which the pin 30 is fitted into a through hole provided in the chute body can be adopted.

Similar to the dust generation reduction chute 10 shown in FIG. 1, the dust generation reduction chute 10A of the modified example 1 having the above configuration has a crusher, a sieve sorter, a discharge port such as a hopper, a transfer portion of a conveyor, and a conveyor. The main surface is tilted and attached to a place where the powder or granular material being transported falls, such as the end.
The powder content 2 of the powder or granular material 1 that falls on the main surface of the dust generation reduction chute 10A falls above the chute main body 12 and flows downward along the main surface. The powder 2 does not flow along the longitudinal direction but collides with the pins 30 due to the plurality of pins 30 provided on the lower main surface of the chute main body 12, and flows in the width direction of the main surface. The lower part of the chute body 12 is a place where the granular material 3 of the powder granular material 1 falls. Below the chute body 12, the powder 2 that has moved from above along the main surface of the chute body 12 stays and can be mixed with the fallen granules 3. The powder or granular material 1 in which the powder content 2 and the granular material 3 are mixed on the chute main body 12 falls to the floor surface or the like below. As a result, the powder and the granules are mixed, the falling speed and the collision force are reduced through the pins, and the powder and the granules do not fall and collide at the same time to generate dust.

[Modification 2]
FIG. 3 is a schematic configuration diagram of the dust generation reduction chute of the second modification. As shown in the drawing, the mixing portion 20B of the dust generation reduction chute 10B of the second modification adopts a bar screen 40 structure in which a plurality of slits are provided along the longitudinal direction of the chute main body 12. The slit includes a first slit 42 in which powder falls above the chute body 12, and a second slit 44 in which particles fall below the chute body 12. The first slit 42 is set shorter (narrower) than the second slit 44.
The first slit 42 may adopt a flat plate shape when the content of one powder or granular material is small. As a result, the powder can be flowed to the drop position of the fluid and mixed.

Similar to the dust generation reduction chute 10 shown in FIG. 1, the dust generation reduction chute 10B of the modified example 2 having the above configuration has a crusher, a sieve sorter, a discharge port such as a hopper, a transfer portion of a conveyor, and a conveyor. The main surface is tilted and attached to a place where the powder or granular material being transported falls, such as the end.
The powder content 2 of the powder or granular material 1 that falls on the main surface of the dust generation reduction chute 10B falls into the first slit 42 above the chute main body 12 and flows downward along the main surface. The second slit 44 below the chute main body 12 is a place where the granular material 3 of the powder granular material 1 falls. In the second slit 44 below the chute body 12, the powder 2 that has moved from the first slit 42 above along the main surface of the chute body 12 and the granules 3 that have fallen onto the second slit 44 are mixed. be able to. The powder or granular material 1 in which the powder content 2 and the granular material 3 are mixed in the second slit 44 falls from between the slits to the floor surface below. As a result, the powder and the granules are mixed and degassed through the slit, the falling speed and the collision force are reduced, and the powder and the granules do not fall and collide at the same time to generate dust.

The present invention has industrial applicability particularly in fields such as a crushed stone factory that handles fine sand such as crushed sand and clay, a cement factory, a coal facility that handles powder and granular materials that generate dust, food, and a chemical factory. There is.

1 ……… Powdered granules, 2 ……… Powder content, 3 ……… Granules, 10, 10A, 10B ……… Dust generation reduction chute, 12 ……… Shoot body, 20, 20A, 20B ……… Mixing part, 30 ……… Pin, 40 ……… Bar screen, 42 ……… 1st slit, 44 ……… 2nd slit.

Claims (1)

A dust generation reduction chute that receives powder particles that fall during transportation.
A chute body that receives the powder or granular material on an inclined main surface is provided.
The shoot body is provided with a mixed portion of the powder and the granules contained in the powder or granular material .
The mixing portion is a bar screen provided with a plurality of slits along the longitudinal direction of the chute body.
The slit is composed of a first slit into which the powder falls and a second slit in which the granules fall, and the first slit is characterized in that the distance between the slits is set shorter than that of the second slit. Dust reduction chute.

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