JP2018020880A - Dust emission reduction chute - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a dust emission reduction chute that can reduce dust emission from a powder and granular material falling from a transportation conveyor by a simple configuration.SOLUTION: A dust emission reduction chute 10 receives a powder and granular material 1 falling in transportation. The dust emission reduction chute 10 includes a chute body 12 for receiving the powder and granular material 1 at an inclined principal surface. The chute body 12 is provided with a mixing part 20 for powder 2 and grain 3 contained in the powder and granular material 1.SELECTED DRAWING: Figure 1

Description

  The present invention particularly relates to a dust generation reduction chute that reduces dust generation when dry-crushed powder particles fall from a transfer part of a transport conveyor or the like.

  The granular material generated in the dry crushing process becomes fine particles at the time of crushing or dropping, 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 prevents dust from being scattered during conveyance by a dust-proof cover that covers the conveyance path of the conveyance conveyor, a nozzle that injects water in the dust-proof cover, and a dust collector that is connected to the dust-proof cover. doing.
The wet dust collector disclosed in Patent Document 2 includes a suction pipe that sucks dust-mixed air from a dust-proof cover of a conveyor, and a wet pipe that stirs and mixes the dust with sewage, and returns purified air to the dust-proof cover so that the inside of the conveyor Is purifying.

The dust scattering prevention cover disclosed in Patent Document 3 is formed along the transport path of the transport conveyor, and a part of the cross-sectional area in the direction orthogonal to the transport direction of the transport conveyor is partially formed.
The dust generation suppression method disclosed in Patent Document 4 suppresses dust generation by supplying bubbles from the lower side of the powdery particles in the granular material falling from the conveyor.

Japanese Patent Laid-Open No. 7-96209 JP 2001-327825 A Japanese Patent No. 5879423 Japanese Patent No. 5644582

However, the crushing plant vehicle of Patent Document 1 requires a dust collector and a water jet water supply / drainage facility for dust prevention, which causes a problem that the facility becomes large and the facility cost increases.
Moreover, the dust collector of Patent Document 2 has a problem that it is difficult to control wetting. This is because the generation amount of pulverization is not constant, and the generation amount of dust varies depending on the conveyance status.

Moreover, the dust scattering prevention cover of Patent Document 3 can prevent dust scattering on the conveyor. However, it cannot be expected to prevent scattering against dust generated when it is dropped and supplied from a lithotripter, hopper, etc. onto the conveyor. The dust generation suppression method of Patent Document 4 uses bubbles with less moisture. Since it is in a wet state, the use of a surfactant makes the viscosity higher than that of water, and the particles are aggregated by rolling during transfer. This agglomeration improves dust prevention and slipperiness on the conveyor. However, when the amount of water increases, the adhesiveness increases due to the viscosity of the foam, which may cause inconvenience in conveyance, and there is a problem that adjustment for proper foam supply is difficult.

  In view of the above-described problems of the prior art, an object of the present invention is to provide a dust generation reduction chute that can reduce dust generation of a granular material falling from a conveyor with a simple configuration.

  As a first means for solving the above-mentioned problem, the present invention is a dust reduction chute that receives a granular material that falls during transportation, and includes a chute body that receives the granular material on an inclined main surface, An object of the present invention is to provide a dust reduction chute characterized in that the chute body is provided with a mixing portion of powder and granules contained in the powder.

  The granular material being conveyed is in a state in which powder is collected on the belt of the conveyor by vibration and the granular material covers the powder. When falling in this state, the powder and the granular material having a heavy falling particle and increasing the falling speed enclose air and collide with the floor surface together when falling. At this time, the powder of the granular material scatters to the surroundings together with air due to the collision and generates dust.

  According to the first means, since the mixing part is provided in the chute body that is received by the inclined main surface, the dropped powder remains in the mixing part, and the powder and the granule are mixed. Since the falling speed and the collision force are reduced, the powder and particles are not dropped and collided at the same time.

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 chute body into a downward convex shape along the longitudinal direction. To provide a dust reduction chute.
According to the second means, the main surface of the chute main body is curved into an R shape so that the powder content is retained on the chute main body, so the mixing of the powder content and the particles, the falling speed, and the collision force are reduced. Thus, the dust and particles are not dropped and collided at the same time.

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 predetermined intervals. An object of the present invention is to provide a dust reduction chute characterized by this.
According to the third means, the main surface of the chute body is provided with a plurality of pins protruding from the main surface, and the powder flows in the width direction of the main surface without flowing along the main surface along the longitudinal direction. Can be mixed with. As a result, the mixing of the powder and particles, the falling speed, and the collision force are reduced, and the powder and the particles are not dropped and collided at the same time to generate dust.

As a fourth means for solving the above problem, in the first means, the mixing unit is a bar screen provided with a plurality of slits along a longitudinal direction of the chute body, The slit is composed of a first slit from which the powder is dropped and a second slit from which the granule falls, and the first slit is set shorter than the second slit. The object is to provide a dust reduction chute.
According to said 4th means, the powder of the fallen granular material falls to the 1st slit, flows to the 2nd lower slit along the main surface, and is made to mix with the granular material which fell to the 2nd slit. It can be dropped from between the slits, degassed through the slits, the falling speed and the collision force are reduced, and the powder and particles do not collide at the same time and generate dust.

  According to the present invention, the chute body received by the inclined main surface is provided with a mixing portion of the powder and granule contained in the granule, so that the powder and granule separated during transportation are separated. Since the falling speed and the impact force are reduced, the powder and the particles do not collide at the same time and generate dust.

It is a structure schematic diagram of the dust generation reduction chute of the present invention. It is the structure schematic of the dust generation reduction chute of the modification 1. It is the structure schematic of the dust generation reduction chute of the modification 2. It is explanatory drawing of the granular material in conveyance and the granular material falling.

Embodiments of the dust 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 for attachment at locations where powder particles being transported fall, such as crushers, sieve sorters, discharge ports such as hoppers, transfer sections of conveyors, and conveyor ends.
The granular material of the present invention is a mixture of a powder and a granule, and the powder becomes dust when the particle diameter is smaller than that of the granule and diffuses.

[Dust generation reduction chute 10]
FIG. 1 is a schematic diagram of a dust reduction chute according to 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 forms a mixing unit 20 in the chute main body 12.
The chute body 12 is set to have a width that is substantially the same as the width of the conveyance path, and the length in the longitudinal direction is set to a length that can receive the falling granular material. It is a plate-shaped steel plate member set to a thickness with a predetermined strength capable of withstanding an impact at the time of collision.
The chute main body 12 is attached with a main surface inclined at a location where the powder particles being transported fall, such as a discharge port of a crusher, a sieve sorter, a hopper, a transfer conveyor, a conveyor end, and the like.

  The chute body 12 is provided with a mixing unit 20. The mixing unit 20 shown in FIG. 1 is formed by curving the chute body 12 in a downward convex shape along the longitudinal direction. In such a side view, the R-shaped mixing unit 20 is downward along the curved main surface where the powder content 2 of the falling granular material 1 falls above the chute body 12, in other words, on the upstream side of the conveyance path. To flow. Below the chute body 12 is a location where the granule 3 of the powder 1 falls. Below this chute body 12, the powder 2 that has moved from above stays and mixes with the fallen granules 3. The granular material 1 in which the powder 2 and the granular material 3 are mixed on the chute body 12 falls to the floor surface below.

[Action]
The operation of the dust generation reduction chute of the present invention having the above configuration will be described below.
FIG. 4 is an explanatory diagram of the granular material being conveyed and the falling granular material. As shown in the figure, the granular material 1 being conveyed by a conveying conveyor or the like is in a state in which the powder 2 is collected on the belt of the conveying conveyor by vibration, and the coarse particle 3 covers the powder 2. . When falling in this state, the powder 2 and the granular material 1 whose dropping speed is increased by the heavy granular material 3 enclose air and collide with the floor surface together when falling. At this time, the powder 2 of the granular material scatters to the surroundings together with the air due to the collision and generates dust.
In general, when the powder particles have the same particle size distribution and the same moisture content, the amount of dust generation is proportional to the amount of encapsulated air, the amount of falling, the falling speed, and the collision force. For this reason, in order to reduce the amount of generated dust, it is necessary to extract the encapsulated air and to mix the powder and particles so as not to collide by lowering the falling speed.

  The dust generation chute 10 of the present invention is configured such that the main surface is inclined at a location where powder particles being transported fall, such as a discharge port of a crusher, a sieve sorter, a hopper, a transfer conveyor connection portion, a conveyor end, and the like. It is attached. The powder 2 of the granular material 1 falling on the main surface of the dust generation reduction chute 10 falls downward above the chute body 12 and flows downward along the curved main surface. Below the chute body 12 is a location where the granule 3 of the powder 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 dropped granules 3. The granular material 1 in which the powder 2 and the granular material 3 are mixed on the chute body 12 falls to the floor surface below. For this reason, dust and particles do not fall and collide at the same time to generate dust.

[Modification 1]
FIG. 2 is a schematic configuration diagram of a dust reduction chute according to the first modification. As illustrated, the mixing unit 20A of the dust generation chute 10A according to the first modification employs a plurality of pin 30 structures that protrude from the main surface of the chute body 12 at predetermined intervals on the main surface. The number of pins 30 and the interval between the pins 30 can be arbitrarily changed depending on the content of the powder in the granular material. For example, when the content of the powder content is large, the powder content of the mixing unit 20A is likely to stay by increasing the number of pins 30 installed and setting the arrangement interval to be narrow. For attachment / detachment of 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 employed.

The dust reduction chute 10A of Modification 1 having the above-described configuration is similar to the dust reduction chute 10 shown in FIG. 1, such as a crusher, a sieve sorter, a discharge port of a hopper, a transfer conveyor connecting portion, and a conveyor. The main surface is inclined and attached to a point where the granular material being transferred falls, such as the end.
The dust 2 of the granular material 1 falling on the main surface of the dust generation reduction chute 10A falls above the chute body 12 and flows downward along the main surface. The dust 2 does not flow along the longitudinal direction of the main surface by the plurality of pins 30 provided on the lower main surface of the chute body 12, but collides with the pins 30 and flows in the width direction of the main surface. Below the chute body 12 is a location where the granule 3 of the powder 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 dropped particles 3. The granular material 1 in which the powder 2 and the granular material 3 are mixed on the chute body 12 falls to the floor surface below. As a result, the powder and the particles are mixed, the falling speed and the collision force are reduced via the pins, and the powder and the particles are not dropped and collided at the same time to generate dust.

[Modification 2]
FIG. 3 is a schematic configuration diagram of a dust generation reduction chute according to the second modification. As illustrated, the mixing unit 20B of the dust generation reduction chute 10B of the second modification employs a bar screen 40 structure in which a plurality of slits are provided along the longitudinal direction of the chute body 12. The slit is composed of a first slit 42 where powder falls below the chute body 12 and a second slit 44 where particles fall below the chute body 12. The first slit 42 is set to be shorter (narrower) than the second slit 44.
In addition, the 1st slit 42 may employ | adopt a flat form, when there is little content for 1 powder of a granular material. As a result, the powder can be mixed by flowing to the fluid drop position.

The dust reduction chute 10B of Modification 2 having the above-described configuration is similar to the dust reduction chute 10 shown in FIG. 1, such as a crusher, a sieve sorter, a discharge port of a hopper, a transfer conveyor connecting portion, and a conveyor. The main surface is inclined and attached to a point where the granular material being transferred falls, such as the end.
The powder 2 of the granular material 1 falling on the main surface of the dust generation reduction chute 10B falls to the first slit 42 above the chute body 12 and flows downward along the main surface. The second slit 44 below the chute body 12 is a place where the granular material 3 of the granular material 1 falls. In the second slit 44 below the chute body 12, the powder 2 that has moved from the upper first slit 42 along the main surface of the chute body 12 and the particles 3 that have fallen on the second slit 44 are mixed. be able to. The granular material 1 in which the powder 2 and the granular material 3 are mixed in the second slit 44 falls from between the slits to the lower floor surface or the like. As a result, the powder and particles are mixed and deaerated through the slits, the falling speed and the collision force are reduced, and the powder and particles are not dropped and collided 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 and clay such as crushed sand, a cement factory, a coal facility that handles fine particles that generate dust, a food, and a chemical factory. Yes.

DESCRIPTION OF SYMBOLS 1 ......... Powder body, 2 ......... Fraction, 3 ......... Particle, 10, 10A, 10B ......... Dust reduction chute, 12 ......... Chute body, 20, 20A, 20B ......... Mixing part, 30 ......... pin, 40 ...... bar screen, 42 ......... first slit, 44 ......... second slit.

Claims (4)

A dust reduction chute that receives powder particles falling during transportation,
A chute body that receives the powder body on an inclined main surface,
A dust reduction chute characterized in that the chute body is provided with a mixing portion of the powder and granules contained in the powder and granules.   The dust mixing reduction chute according to claim 1, wherein the mixing portion is formed by curving the chute body in a downward convex shape along a longitudinal direction.   The dust generation reduction chute according to claim 1, wherein the mixing portion is a plurality of pins that protrude from the main surface of the chute main body at a predetermined interval. The mixing unit is a bar screen provided with a plurality of slits along the longitudinal direction of the chute body,
The slit comprises a first slit from which the powder falls and a second slit from which the granule falls, and the first slit is set shorter than the second slit. The dust reduction chute according to claim 1.

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