JP7126094B2 - Apparatus for removing falling objects and method for removing falling objects - Google Patents

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a fallen matter removal apparatus and removal method for removing fallen matter such as coal and coke that have fallen from a belt conveyor in a gutter.

A belt conveyor fire is a problem because once it occurs, it is difficult to extinguish the fire, and the fire spreads over a large area, resulting in the stoppage of production. Conventionally, the following two patterns have been known as mechanisms for belt conveyor fires.

As the first pattern, a large amount of coal accumulates up to the return roller on the gutter that receives the coal that has fallen from the belt conveyor. A flame is generated by igniting the coal that is in contact with the The belt of the belt conveyor is heated by the flame, and the fire eventually spreads to the belt, resulting in a belt conveyor fire.

In the second pattern, the bearing of the return roller is damaged and heats up, and the sparks of red-hot pieces of coal, etc. generated by the heat of the bearing fall down, igniting the coal deposited on the gutter and causing a flame. Occur. The belt of the belt conveyor is heated by the flame, and the fire eventually spreads to the belt, resulting in a belt conveyor fire.

In either pattern, the spread of fire to the belt can be prevented by removing the coal that has fallen into the gutter and accumulated. Therefore, in order to prevent the occurrence of belt conveyor fires, it is important to quickly remove fallen objects such as coal accumulated in the gutter.

As a technique for removing falling objects such as coal deposited in a gutter, Patent Document 1 discloses a technique in which the top of the gutter is remodeled into a lion's head to intermittently flow a large amount of water. Further, in Patent Document 2, a water storage tank in which the water supply port and the center are eccentric is separately provided upstream of the conveyor, and when a certain amount of water is stored in the water storage tank, the water storage tank rotates like a lion's threat, and the water storage tank A technique is disclosed for intermittently flowing the water inside the trough through a case and a discharge pipe.

JP-A-2007-269443 Utility Model Registration No. 3152811

However, the technology disclosed in Patent Document 1 requires a space for installing and operating a lion threat at the bottom of the belt of the belt conveyor, so it is applicable to low-floor conveyors where the height difference between the belt and the gutter is small. I had a problem that I couldn't do it. The distance between the gutter and the return roller is short, and the risk of belt conveyor fires is high. Fire prevention measures are necessary for low-floor conveyors, and the technology disclosed in Patent Document 1 was not applicable to low-floor conveyors. .

In addition, in the technology disclosed in Patent Document 2, although it became possible to apply it to a low-floor conveyor by separating the lion threat from the gutter, the fallen fallen accumulated in the range of the gutter about 100 mm upstream from the discharge pipe. There was a problem that the discharged water was not applied well to the objects, and fallen objects such as coal remained at the top of the gutter. The present invention has been made in view of these problems, and provides an apparatus and method for removing fallen matter that is applicable to low-floor conveyors and that can clean and remove fallen matter deposited on the top of a gutter. for the purpose.

Means for solving the above problems are as follows.
(1) A fallen object removing device for removing fallen objects by intermittently discharging a constant amount of washing water to an inclined gutter provided below a belt conveyor, wherein A lion-threat-type washing water discharge device provided at a higher position, and a washing water discharge device provided at the top of the gutter, extending in the width direction of the gutter and obliquely downward in the upstream direction of the washing water flowing through the inclined gutter. A fallen object removing device, comprising: a nozzle header provided with a nozzle for ejecting cleaning water; and a pipe for guiding the cleaning water discharged from the lion-threat type cleaning water discharging device to the nozzle header.
(2) The falling object according to (1), wherein the nozzle is a long rectangular slit along the width direction of the gutter, and the width of the slit is equal to or greater than the width of the gutter minus 160 mm. removal device.
(3) The center of the slit is located at a position where the angle of clockwise rotation of the center of the vertical section in the longitudinal direction of the nozzle header is 30° or more and 60° or less with respect to the direction perpendicular to the water flow direction of the gutter. A device for removing falling objects according to (2), wherein a line is provided.
(4) A method for removing fallen objects by intermittently discharging a constant amount of washing water to an inclined gutter provided below a belt conveyor, which is provided at a position higher than the top of the inclined gutter. Washing water is intermittently discharged into the trough from a lion-threat type washing water discharge device, and is directed obliquely downward in the upstream direction of the washing water flowing through the inclined trough from a nozzle header extending in the width direction of the trough. A method for removing fallen objects, wherein the washing water is jetted.
(5) The washing water is poured into the gutter in a direction that makes an angle of 30° or more and 60° or less clockwise about the center of the vertical cross section in the longitudinal direction of the nozzle header with respect to the direction perpendicular to the water flow direction of the gutter. The falling object cleaning method according to (4), wherein the falling object is ejected.

The apparatus for removing fallen objects and the method for removing fallen objects according to the present invention can also be applied to a low-floor conveyor, and can flow discharged water to the top of a gutter. This effectively cleans and removes fallen matter deposited on the top of the gutter.

FIG. 2 is a schematic side cross-sectional view and a perspective view showing an example of the device for removing fallen objects 10 and a gutter 30 according to the present embodiment. FIG. 4 is a schematic diagram of an apparatus used to confirm the relationship between the width of the slit nozzle 24 and the spread width of the water discharged from the nozzle 26; 4 is a graph showing the relationship between the flow rate and the gap of the slit nozzle 24. FIG. 4 is a graph showing the relationship between the flow rate and the gap of the slit nozzle 24 when the gutter 30 described above is used. FIG. 3 is a schematic side view showing the positional relationship between the nozzle header 22 and the gutter 30 in the dropped object removing device used in the test. It is an enlarged view of the (A) part of FIG.

Hereinafter, the present invention will be described through embodiments of the present invention. FIG. 1 is a schematic side sectional view (FIG. 1(a)) and a perspective view (FIG. 1(b)) showing an example of a fallen object removing device 10 and a gutter 30 according to the present embodiment. The gutter 30 is a groove-shaped member that is provided directly below a belt conveyor that conveys raw materials such as coal, and that is arranged at an angle so that there is a difference in height between both ends. In the gutter 30, fallen objects such as coal that have fallen from the belt conveyor are deposited. As described above, since the fallen matter accumulated in the gutter 30 causes a belt conveyor fire, washing water is periodically poured from the fallen matter removal device 10 into the gutter 30 to wash the accumulated fallen matter such as coal. and remove.

The falling object removal device 10 has a lion-threat type cleaning water discharge device 12 , a nozzle header guide pipe 20 , and a nozzle header 22 . The lion threat type washing water discharge device 12 is provided at a position higher than the top of the gutter 30. - 特許庁The lion-threat flush water discharge device 12 has a water inlet 14 , an external tank 16 and a trough 18 . Water is supplied from the water supply port 14 and stored in the trough 18 as washing water. When a certain amount of cleansing water is stored in the trough 18, the trough 18 rotates in a lion-like manner, and a certain amount of cleansing water stored in the trough 18 is discharged from the external tank 16. - 特許庁The trough 18 from which the cleansing water has been discharged rotates in reverse to return to its original position, water is supplied from the water supply port 14 again, and the cleansing water is stored in the trough 18 . By repeatedly storing and discharging water by the trough 18 , a certain amount of washing water is intermittently discharged from the lion-threat type washing water discharging device 12 .

A nozzle header 22 extending in the width direction of the gutter 30 is provided above the top of the gutter 30 . Washing water discharged from the lion-threat type washing water discharging device 12 is guided to the nozzle header 22 by the nozzle header guiding pipe 20 . The nozzle header 22 is provided with a slit nozzle 24 for ejecting cleaning water obliquely downward in the upstream direction of the discharged water flowing through the gutter 30 along the width direction of the gutter 30 . The washing water guided to the nozzle header 22 is jetted from the slit nozzle 24 toward the top of the gutter 30 through the nozzle header guiding pipe 20 . In addition, in this embodiment, the washing water ejected from the slit nozzle 24 is defined as the nozzle discharge water 26 .

As described above, in the fallen object removing apparatus 10 according to the present embodiment, the washing water flowing through the inclined gutter 30 is jetted obliquely downward in the upstream direction as the nozzle discharge water 26 . As a result, the nozzle discharge water 26 can be applied to the fallen objects deposited on the top of the gutter 30 (in the range of about 100 mm upstream from the discharge pipe described in Patent Document 2), which could not be sufficiently washed with the conventional technology. Falling matter deposited at the position can be cleaned and removed.

Next, the width of the slit nozzle 24 and the spread width of the nozzle discharge water 26 will be described. Here, the longitudinal direction of the slit nozzle 24 is called the width, and the vertical width of the slit nozzle 24 is called the gap. Note that the gap between the slit nozzles 24 was constant in the width direction. FIG. 2 is a schematic diagram of an apparatus used to confirm the relationship between the width of the slit nozzle 24 and the spread width of the water 26 discharged from the nozzle. The nozzle header 22 is installed so that the height of the slit nozzle 24 is 100 mm from the ground 40, and the nozzle discharge water 26 is jetted from the slit nozzle 24 by changing the amount of water, and the spread width of the nozzle discharge water 26 on the ground 40 is measured. did. Test conditions and test results are shown in Table 1 below.

As shown in Table 1, it was found that the nozzle effluent 26 spreads at least 167 mm before reaching the ground 40 100 mm below. Based on this result, the length of the slit nozzle 24 was made equal to or greater than the width obtained by subtracting 160 mm from the width of the gutter 30 .

Next, the flow rate of water flowing through the gutter 30 will be described. It is known that a water flow velocity of 0.6 m/sec or more is required to flow water without accumulating earth and sand. Since coal has a lower specific gravity than earth and sand, if the flow velocity of water flowing through the gutter 30 is set to 0.6 m/sec or more, it is considered that the coal accumulated in the gutter 30 can be sufficiently washed and removed. The average flow velocity V1 of water flowing through the gutter 30 can be expressed by the following equation ( ₁ ) according to Manning's equation.

上記（１）式において、Ｒは水理学的平均水深（流れの断面積である流積を流れに接する固体壁の断面長さで除した値）であり、Ｉは水勾配であり、Ｖ_１は必要流速であり、ｎは粗度係数である。ここで、Ｖ_１＝０．６ｍ／ｓｅｃ（必要流速）とし、粗度係数ｎを０．０１２（鋼製の樋であることから鋼でライニングされた水路）とすると、水理学的平均水深Ｒは、下記（２）式で表すことができる。

In the above formula (1), R is the hydraulic average water depth (the value obtained by dividing the flow volume, which is the cross-sectional area of the flow, by the cross-sectional length of the solid wall in contact with the flow), I is the water gradient, and V ₁ is the required flow velocity and n is the roughness factor. Here, assuming that V ₁ = 0.6 m/sec (required flow velocity) and the roughness coefficient n is 0.012 (steel troughs are steel-lined channels), the average hydraulic depth R can be represented by the following formula (2).

Assuming that the width of the gutter 30 is Y, R is sufficiently smaller than Y. Therefore, R can be regarded as the height of water flowing through the gutter 30 . Therefore, the flow rate _Q1 of the nozzle discharge water 26 flowing through the gutter 30 can be expressed by the following equation (3).

The designed maximum flow rate Q2 of the gutter 30 was set with a safety factor of ₃ times the flow rate _Q1 . The design maximum flow rate _Q2 can be expressed by the following equation (4).

Here, the maximum flow rate and required flow rate will be explained. In this embodiment, the maximum flow rate means the instantaneous maximum flow rate that can flow from the slit nozzle 24 . Assuming that the cross-sectional area of the slit nozzle 24 is A and the cross-sectional area of the nozzle header 22 is B, when the cross-sectional area A is equal to or larger than the cross-sectional area B, the maximum flow rate is the design maximum flow rate _Q2 because it is synonymous with opening to the atmosphere. Become. On the other hand, when the cross-sectional area A is less than the cross-sectional area B, the nozzle header 22 is filled with water, pressure loss occurs in the slit nozzle 24, and the maximum flow rate becomes less than the design maximum flow rate _Q2 .

On the other hand, the required flow rate means the flow rate at which a flow velocity of 0.6 m/sec can be maintained at the position of the slit nozzle 24 . Assuming that the gap between the slit nozzles 24 is C, the required flow rate _Q3 can be expressed by the following equation (5).

The gap between the slit nozzles 24 at which the maximum flow rate and the remaining power of the required flow rate are maximized is the optimum gap between the slit nozzles 24. This is the case where the cross-sectional area A of the slit nozzle 24 is equal to the cross-sectional area B of the nozzle header 22. be. Therefore, when the inner diameter of the nozzle header 22 is D, the following equation (6) holds, and the optimal gap C between the slit nozzles 24 can be expressed by the following equation (7).

Moreover, since the required flow rate _Q3 is required to be less than the design maximum flow rate _Q2 , the gap C of the slit nozzle 24 is limited within the range of the following formula (8).

FIG. 3 is a graph showing the relationship between the flow rate and the gap of the slit nozzle 24. As shown in FIG. The gap C of the slit nozzle 24 is preferably an optimum gap πD ² /{4×(Y−0.16)} that maximizes the residual force. 0.16)×I ^3/4 }.

Next, the result of confirming the wall surface height of the gutter 30 will be described. A gutter 30 having an inclination angle of 7°, a width of 1560 mm, a wall height of 100 mm, and a total length of 55 m, which can be applied to a belt conveyor with a total length of 55 m, was used. The water gradient I of the gutter 30 having an inclination angle of 7° and a total length of 55 m is 0.122.

As a result of calculation using the above formula (4), the design maximum flow rate Q ₂ was 8.6 L / sec (0.52 m ³ / min). , 15 L/min of water was supplied to the trough 18 from the water supply port, and the trough 18 was set to rotate once every 6 minutes in a lion-like manner to discharge washing water into the external tank 16 .

FIG. 4 is a graph showing the relationship between the flow rate and the gap of the slit nozzle 24 when the gutter 30 having the dimensions described above is used. The gap C of the slit nozzle 24 is most preferably set to 7.3×10 ⁻³ m where the remaining force, which is the difference between the required flow rate and the maximum flow rate, is maximized. In order to keep the required flow rate below the design maximum flow rate, the gap C of the slit nozzle 24 must be less than 9.7×10 ⁻³ m.

FIG. 5 is a schematic side view showing the positional relationship between the nozzle header 22 and the gutter 30 in the dropped object removing device used in the test. As shown in FIG. 5, the diameter of the nozzle header 22 was 100A, and the nozzle header 22 was installed so that the center of the nozzle header 22 was positioned 110 mm downstream from the top of the gutter 30 .

FIG. 6 is an enlarged view of part (A) of FIG. The angle of the slit nozzle 24 will be described with reference to FIG. _The angle of the slit nozzle 24 is the angle θ1 shown in FIG. That is, the angle of the slit nozzle 24 is an angle θ ₁ ( clockwise). _The test was conducted with the nozzle header 22 installed so that the angle θ1 of the slit nozzle 24 was 45°. Test conditions and test results are shown in Table 2 below.

As described above, the design maximum flow rate Q ₂ is 0.52 m ³ /min, so Test No. 12 substantially corresponds to the test in which the nozzle discharge water 26 at the design maximum flow rate was flowed. As shown in Table 2, overflow from the gutter 30 occurred in Test No. 14 where the flow rate was 1.20 m ³ /min, which is _twice the design maximum flow rate Q2. From this result, it was confirmed that by setting the wall height of the gutter 30 to 100 mm, water overflow from the gutter 30 does not occur within the design maximum flow rate _Q2 .

Next, the angle of the slit nozzle 24 will be explained. Using the test equipment used in the tests in Table 2, only the angle of the slit nozzle 24 was changed, and the state of ejection of the nozzle discharge water 26 and the state of washing and removing fallen objects were confirmed. Test conditions and test results are shown in Table 3 below.

As shown in Table 3, when the angle of the slit nozzle 24 is within the range of 30° or more and 60° or less, water does not overflow from the gutter 30, and all the fallen coal deposited on the top of the gutter 30 is removed. washed and removed. On the other hand, when the angle of the slit nozzle 24 was 28°, the jetted nozzle discharge water 26 rebounded from the gutter 30 and scattered outside the gutter 30 . Also, when the angle of the slit nozzle 24 was 62°, water overflowed from the gutter 30 . From these results, it was confirmed that it is preferable to set the angle of the slit nozzle 24 to 30° or more and 60° or less.

REFERENCE SIGNS LIST 10 falling object removal device 12 lion threat type cleaning water discharge device 14 water supply port 16 external tank 18 trough 20 nozzle header guide pipe 22 nozzle header 24 slit nozzle 26 nozzle discharge water 30 gutter 40 ground

Claims (5)

A fallen object removal device for removing coal that has fallen and accumulated in the tub by intermittently discharging a constant amount of washing water to an inclined gutter provided below a belt conveyor,
a lion-threat-type washing water discharge device provided at a position higher than the top of the inclined gutter;
A long rectangle extending in the width direction of the gutter, which is provided at the top of the gutter and extends in the width direction of the gutter, jetting the cleaning water diagonally downward in the upstream direction of the cleaning water flowing through the inclined gutter, and extending in the width direction of the tub. a nozzle header provided with nozzles that are slits of
and a pipe for guiding the washing water discharged from the lion-threat-type washing water discharging device to a nozzle header. 2. The apparatus for removing fallen objects according to claim 1, wherein the width of said slit is equal to or greater than the width obtained by subtracting 160 mm from the width of said gutter. The center line of the slit is provided at a position where the angle of clockwise rotation of the center of the vertical cross section in the longitudinal direction of the nozzle header is 30° or more and 60° or less with respect to the direction perpendicular to the water flow direction of the gutter. 3. The apparatus for removing falling objects according to claim 2, wherein: A method for removing fallen objects by intermittently discharging a constant amount of washing water to an inclined gutter provided below a belt conveyor to remove coal that has fallen and accumulated in the tub ,
Washing water is intermittently discharged to the gutter from a lion-threat type washing water discharge device provided at a position higher than the uppermost part of the inclined gutter, and the washing water is extended in the width direction of the gutter and extends in the bucket. A method for removing fallen objects, wherein the cleaning water flowing through the inclined gutter is jetted obliquely downward in the upstream direction from a nozzle header provided with nozzles that are long rectangular slits along the width direction . The cleaning water is jetted into the gutter in a direction that makes an angle of 30° or more and 60° or less clockwise about the center of the vertical cross section in the longitudinal direction of the nozzle header with respect to the direction perpendicular to the water flow direction of the gutter. The method for removing falling objects according to claim 4.

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