JP5601151B2 - Hopper skirt device for quantitative cutting device - Google Patents

Description

  The present invention relates to a hopper skirt device for a quantitative cutout device that prevents a raw material cut out from a hopper of the quantitative cutout device from falling from the outside of a belt conveyor.

In the steelworks, the coal (raw material) in the ironmaking district is transported, for example, as shown in FIG. FIG. 4 is a schematic diagram of an example of a raw material transport line in the ironmaking district.
In FIG. 4, coal a is cut out from a coal yard by a loader 100 and conveyed to a fixed amount cutting device (CFW) 120 via a belt conveyor 110.
The quantitative cutout device 120 includes a plurality of hoppers 121, and coals a having different brands are conveyed to each hopper 121. And the coal a cut out from each hopper 121 falls on each feeder conveyor (belt conveyor) 122 installed under each hopper 121. Then, the coal a dropped on each feeder conveyor 122 is transported by each feeder conveyor 122, falls on a scale conveyor (belt conveyor) 123, and is transported by the scale conveyor 123.

Next, the coal a is transported from the scale conveyor 123 onto the belt conveyor 131 of the coal pulverizer 130 for adjusting the particle size of the coal a. Then, it is conveyed to the coke oven 140.
In such a coal a transporting process, if the coal a falls from the belt conveyors 110, 122, 123, 131, and 132, the environmental disaster prevention is greatly affected. In particular, when the coal a is cut out from each hopper 121 onto the feeder conveyor 122 in the quantitative cutout device 120, the coal a may spill out of the feeder conveyor 122.

  Therefore, conventionally, as shown in FIG. 5, in the quantitative cutout device 120, the gap between the lower skirt portion 125 of each hopper 121 and the feeder conveyor 122 is covered with a hopper skirt device 126. Further, a scattering prevention chute 124 is attached to the tail portions of the feeder conveyor 122 and the scale conveyor 123 so as to prevent the coal a from scattering.

6 schematically shows a quantitative cutout device having a conventional hopper skirt device, and is a cross-sectional view of the quantitative cutout device 120 shown in FIG. 5 cut in a direction perpendicular to the advancing direction of the feeder conveyor 122. is there.
As shown in FIG. 6, in the quantitative cutout device 120, a pair of hopper skirt devices 126 are attached to both sides of a skirt portion 125 provided at the lower portion of the hopper 121 by a pair of attachment means 127. Each hopper skirt device 126 is configured by a flat plate extending in the conveying direction of the feeder conveyor 122. Each hopper skirt device 126 is attached to the outer surface of the skirt portion 125 so that the lower end portion thereof is in contact with the upper surface of the belt 122b of the feeder conveyor 122. In FIG. 6, the code | symbol 122a is a carrier roll.

However, in the hopper skirt device 126 shown in FIG. 6, if the rigidity of the hopper skirt device 126 formed of a flat plate is small, the coal a already deposited on the skirt portion 125 due to the impact force of the falling of the coal a There is a case in which a phenomenon (coking charcoal) occurs in which the hopper skirt device 126 is spread and dropped from the feeder conveyor 122.
Further, since the hopper skirt device 126 is in contact with the belt 122b, the belt 122b may be worn and broken.

Therefore, in order to solve such a problem, a quantitative cutout device 220 having a hopper skirt device 224 shown in FIG. 7 has been proposed (see Patent Document 1). FIG. 7 schematically shows a quantitative cutout device having another conventional hopper skirt device, and is a sectional view of the quantitative cutout device cut in a direction perpendicular to the advancing direction of the feeder conveyor.
7 includes a hopper 221 that cuts out coal (raw material) a, and a feeder conveyor (belt conveyor) 222 that is installed below the hopper 221 and conveys the coal a cut out from the hopper 221. ing. A pair of hopper skirt devices 224 are attached to the skirt portion 223 provided at the lower portion of the hopper 221 by a pair of attachment means 227.

  Each hopper skirt device 224 includes a cylindrical pipe fixing member 226 attached to the skirt portion 223 by an attaching means 227, and a steel cylindrical pipe 225 fixed to the lower end portion of the cylindrical pipe fixing member 226 by welding or the like. . The cylindrical pipe 225 has a cylindrical pipe shape extending in the conveying direction of the feeder conveyor 222, and is attached to the skirt portion 223 so as to contact the belt 222b of the feeder conveyor 222. In addition, a force to push the cylindrical pipe 225 outward by the coal a falling from above acts on the cylindrical pipe 225. Therefore, a reinforcing member 226a is attached from the outside between the shoulder of the cylindrical pipe 225 and the cylindrical pipe fixing member 226. ing.

  The attachment means 227 includes a fixing member 228 fixed to the outside of the skirt portion 223. When the cylindrical pipe 225 is attached to the skirt portion 223, the fixing bolt 229 is inserted into the fixing member 228 through the nut 231 on the fixing member 228, and the cylindrical pipe is connected to the fixing bolt 229 with two nuts 230. The fixing member 226 is fixed. Thereby, the cylindrical pipe fixing member 226 and the cylindrical pipe 225 are positioned in the vertical direction. Then, the cotter pin 233 is driven into the cotter piece 232, and the cylindrical pipe fixing member 226 is fixed to the skirt portion 223.

  As described above, in the hopper skirt device 224 shown in FIG. 7, by using the cylindrical pipe 225 for the hopper skirt device 224, the rigidity of the hopper skirt device 224 is increased, and the contact area with the belt 222b is reduced to reduce the belt 222b. As much as possible, breakage is avoided.

JP 2007-238230 A

However, the conventional hopper skirt device 224 shown in FIG. 7 has the following problems.
That is, as shown in FIG. 7, there is a problem that coal a falling from above rubs the shoulder portion of the cylindrical pipe 225 and wears the cylindrical pipe 225.

Further, since the cylindrical pipe 225 is attached to the skirt portion 223 so as to contact the belt 222b of the feeder conveyor 222, the belt 222b may still be worn and broken. Further, coal a may be caught in the gap between the cylindrical pipe 225 and the belt 222b, and the belt 222b may be damaged and broken.
Accordingly, the present invention has been made to solve the above-mentioned problems, and the object thereof is to suppress the abrasion caused by the raw materials as much as possible and to reduce the possibility of the belt breaking, and the hopper skirt device for the quantitative cutting device. Is to provide.

In order to achieve the above object, a hopper skirt device for a quantitative cutting device according to claim 1 of the present invention is a hopper that cuts out a raw material, and is installed below the hopper and conveys the raw material cut out from the hopper. A hopper skirt device used in a quantitative cutout device provided with a belt conveyor and a skirt portion provided at a lower portion of the hopper and preventing the raw material from falling from the outside of the belt conveyor, wherein A mounting plate extending in the conveying direction of the belt conveyor and attached to the outer surface of the skirt portion so as to open a gap with respect to the belt of the belt conveyor, and obliquely upward from the lower end of the mounting plate to the inside of the skirt portion And an inclined plate extending in the conveying direction of the belt conveyor.
According to a second aspect of the present invention, the hopper skirt device for a quantitative cutout device according to the first aspect is the hopper skirt device for the quantitative cutout device according to the first aspect, wherein the angle between the inclined plate and the mounting plate is 40 ° to It extends from the mounting plate at 70 °.

  According to the hopper skirt device for a quantitative cutout device according to claim 1 of the present invention, the mounting plate that extends in the vertical direction and the conveying direction of the belt conveyor and is attached to the outer surface of the skirt portion, and the skirt from the lower end of the mounting plate Inclined plates extending obliquely upward inside the belt and extending in the conveying direction of the belt conveyor, so that the raw material dropped from above the hopper extends near the skirt obliquely upward from the mounting plate to the inside of the skirt. It will accumulate on an inclined plate. Due to the presence of the accumulated raw material, the subsequently falling raw material flows through the upper portion of the raw material accumulated on the inclined plate and falls onto the belt of the belt conveyor without directly hitting the inclined plate. For this reason, wear of the hopper skirt device due to the raw material can be suppressed as much as possible.

Further, a gap is formed between the inclined plate and the belt of the belt conveyor. When the falling raw material falls on the belt of the belt conveyor, the raw material does not enter this gap, and the raw material does not bite into the gap between the hopper skirt device and the belt. For this reason, it is possible to reduce the possibility that the raw material bitten by the belt will be damaged and broken.
Furthermore, since the attachment plate is attached so that a gap is opened with respect to the belt of the belt conveyor, the attachment plate constituting the hopper skirt device does not contact the belt, and wear of the belt due to the contact of the hopper skirt device is prevented. This can prevent the belt from being broken.

  According to a hopper skirt device for a quantitative cutout device according to a second aspect of the present invention, in the hopper skirt device for a quantitative cutout device according to the first aspect, the angle between the inclined plate and the mounting plate is 40. Since it extends from the mounting plate at an angle of ˜70 °, the wear of the hopper skirt device due to the raw material can be suitably suppressed, and the breakage of the belt can be more effectively prevented.

The quantitative cutout apparatus which has a hopper skirt apparatus which concerns on this invention is shown typically, and it is sectional drawing cut | disconnected in the orthogonal | vertical direction with respect to the advancing direction of a feeder conveyor of the said quantitative cutout apparatus. FIG. 2 is a detailed view of a portion indicated by an arrow X in FIG. 1, (A) shows a state where coal is accumulated on the inclined plate, and (B) shows a state where a gap is formed on the lower side of the inclined plate. It is the figure which showed typically the hopper skirt apparatus shown in FIG. It is a schematic diagram of an example of the raw material transport line of a steelmaking area. It is a perspective view of the fixed quantity cutting device which has the conventional hopper skirt apparatus. FIG. 6 is a cross-sectional view schematically showing a quantitative cutout device having a conventional hopper skirt device, cut in a direction perpendicular to the advancing direction of the feeder conveyor of the quantitative cutout device shown in FIG. 5. It is sectional drawing which shows typically the quantitative cutout apparatus which has a hopper skirt apparatus of the other conventional example, and cut | disconnected the perpendicular cut direction of the said quantitative cutout apparatus with respect to the advancing direction of a feeder conveyor.

Hereinafter, embodiments of the present invention will be described with reference to the drawings. FIG. 1 schematically shows a quantitative cutout apparatus having a hopper skirt device according to the present invention, and is a cross-sectional view of the quantitative cutout apparatus cut in a direction perpendicular to the advancing direction of a feeder conveyor.
FIG. 1 shows a quantitative cutout device 1 for a portion of one hopper 2 among a plurality of hoppers (see FIG. 4) constituting the quantitative cutout device.

The quantitative cutting device 1 includes a hopper 2 that cuts out coal (raw material) a, a feeder conveyor (belt conveyor) 3 that is installed below the hopper 2 and conveys the coal a cut out from the hopper 2, and a lower part of the hopper 2. And a skirt portion 4 for preventing the coal a from dropping from the outside of the feeder conveyor 3 (on the left and right sides in FIG. 1). The feeder conveyor 3 has a plurality of carrier rolls 3a and a belt 3b wound around these carrier rolls 3a. A pair of hopper skirt devices 5 are attached to the skirt portion 4 provided at the lower portion of the hopper 2 by a pair of attachment means 6.
Each hopper skirt device 5 includes an attachment plate 51 attached to the outer surface of the skirt portion 4 and an inclined plate 52 extending from the attachment plate 51, as shown in FIGS.

  The mounting plate 51 is formed of a rectangular flat plate member extending in the vertical direction and the conveying direction of the feeder conveyor 3, and is attached to the outer surface of the skirt portion 4 so that a gap δ is opened with respect to the belt 3 b of the belt conveyor 3. The gap δ is preferably about 10 mm, which is ½ of the average particle size, when the particle size of coal a, which is a raw material, varies depending on the brand, and the average is about 20 mm with a maximum of 40 to 50 mm and a minimum of 3 to 4 mm. At the upper end of the mounting plate 51, there is a mounting portion 51a bent outward. The mounting plate 51 is formed by bending a metal plate or welding two metal plates.

  The inclined plate 52 is a rectangular flat plate member that extends obliquely upward from the lower end of the mounting plate 51 to the inside of the skirt portion 4 and extends in the conveying direction of the belt conveyor 3. The length L of the inclined plate 52 is preferably about 100 mm considering that the inclined plate 52 is worn by the coal a falling from above. The inclined plate 52 is formed by bending a metal plate or welding the metal plate.

The inclined plate 52 may extend from the mounting plate 51 so that an angle θ (see FIG. 3) formed with the mounting plate 51 is an acute angle. However, as described later, the mounting plate 51 has an angle θ of 40 ° to 70 °. It is preferable to extend from the mounting plate 51, and it is most preferable to extend from the mounting plate 51 at an angle θ of 50 °.
The hopper skirt device 5 is manufactured by fixing the mounting plate 51 and the inclined plate 52 by welding. However, the hopper skirt device 5 may integrally form the mounting plate 51 and the inclined plate 52 by bending a metal plate.

2A and 2B, the attachment means 6 includes an L-shaped metal fixing member 61 fixed to the outer surface of the skirt portion 4 by welding or the like. A through hole (not shown) for inserting the fixing bolt 62 is formed in the fixing member 61. Further, a through hole (not shown) for inserting the fixing bolt 62 is also formed in the mounting portion 51 a of the mounting plate 51. In order to attach the mounting plate 51 to the outer surface of the skirt portion 4, a fixing bolt 62 having a head 63 is passed through the mounting plate 51 disposed along the through hole of the fixing member 61 and the outer surface of the skirt portion 4. The nut 64 is inserted into the hole, and the fixing bolt 62 is tightened from below the mounting portion 51a of the mounting plate 51 to position the mounting plate 51 in the vertical direction. Then, the attachment plate 51 is attached to the outer surface of the skirt portion 4 by driving the cotter pin 66 into the cotter piece 65.
By adjusting the tightening position of the nut 64, it is possible to adjust the vertical position of the mounting plate 51, that is, the size of the gap δ. For example, when the particle size of the brand coal used is small, the gap δ may be reduced.

Next, the operation of the hopper skirt device 5 according to this embodiment will be described with reference to FIGS. 1 and 2.
When coal a having a different brand is conveyed to each hopper 2 of the quantitative cutout device 1, the coal a falls from above the hopper 2 through the skirt portion 4 onto the belt 3 b of the feeder conveyor 3. Then, coal a is gradually accumulated in the hopper 2. Then, the coal a is cut out from each hopper 2 and falls onto the belt 3b of each feeder conveyor 3 installed below each hopper 2.

  Here, the coal a that has fallen from above the hopper 2 and that is in the vicinity of the skirt portion 4 is on the inclined plate 52 that extends obliquely upward from the mounting plate 51 to the inside of the skirt portion 4 as shown in FIG. It will be accumulated in. The existence of the accumulated coal a causes the subsequently falling coal a to flow on the upper part of the accumulated coal a on the inclined plate 52, and does not directly contact the inclined plate 52, as shown in FIG. Thus, it falls on the belt 3b of the feeder conveyor 3. Therefore, by providing the inclined plate 52 that extends obliquely upward from the attachment plate 51 to the inside of the skirt portion 4, it is possible to suppress the wear of the skirt device 5 due to the raw material coal a as much as possible.

  Further, as shown in FIG. 2B, a gap 53 is formed between the inclined plate 52 extending obliquely upward from the attachment plate 51 and the belt 3b. When the falling coal a falls on the belt 3b of the feeder conveyor 3, the coal a does not enter the gap 53, and the coal a does not bite into the gap between the hopper skirt device 5 and the belt 3b. For this reason, the possibility that the belt 3b may be damaged and broken by the coal a that has been bitten by the belt 3b can be reduced.

The gap 53 is formed between the inclined plate 52 extending obliquely upward from the attachment plate 51 and the belt 3b, so that the coal a does not fall outside the belt 3b of the belt conveyor 3.
Further, in the hopper skirt device 5, the attachment plate 51 is attached so that the gap δ is opened with respect to the belt 3b of the feeder conveyor 3, so that the attachment plate 51 constituting the hopper skirt device 5 contacts the belt 3b. However, the wear of the belt 3b due to the contact of the hopper skirt device 5 can be prevented, and the belt 3b can be prevented from being broken due to this.

  If the inclined plate 52 extends obliquely downward from the mounting plate 51 to the inside of the skirt portion 4, the falling coal a may directly hit the inclined plate 52 and the inclined plate 52 may be worn. In this case, a gap is formed between the inclined plate 52 and the belt 3b. However, since the distance between the tip of the inclined plate 52 and the belt 3b is reduced, the gap between the tip of the swash plate 52 and the belt 3b is reduced. There is a possibility that the coal a is caught in the belt 3b and the belt 3b is broken. Further, when the inclined plate 52 extends horizontally from the lower end of the mounting plate 51 to the inside of the skirt portion 4, the coal a falling from above is very likely to collide with the inclined plate 52 and the inclined plate 52. The lower gap 53 is too narrow and the coal a is easy to bite. Therefore, the inclined plate 52 extends obliquely upward from the mounting plate 51 to the inside of the skirt portion 4.

Coal a dropped on the belt 3b of each feeder conveyor 3 is transported by each feeder conveyor 3 and dropped on a scale conveyor (reference numeral 123 in FIG. 4), and the coal pulverizer (reference numeral 130 in FIG. 4) is transferred by the scale conveyor. ), And after being crushed by a coal breaker, it is conveyed to a coke oven (reference numeral 140 in FIG. 4).
As mentioned above, although embodiment of this invention has been described, this invention is not limited to this, A various change and improvement can be performed.

For example, the gap δ between the mounting plate 51 and the belt 3b of the feeder conveyor 3 is not limited to about 10 mm, and can be appropriately determined depending on the particle size of the raw material coal a.
Further, the length L of the inclined plate 52 does not need to be about 100 mm, and is appropriately determined depending on the particle size of the hopper 2 or coal a.
Furthermore, the attachment means 6 for attaching the hopper skirt device 5 to the outer surface of the skirt portion 4 is not limited to the structure shown in FIG. 2 as long as the hopper skirt device 5 can be attached to the outer surface of the skirt portion 4.

  In FIG. 3, it was tested how the angle θ formed between the inclined plate 52 and the mounting plate 51 is preferably extended from the mounting plate 51. FIG. 3 is a view schematically showing the hopper skirt device shown in FIG. In FIG. 3, symbol A is the horizontal length of the inclined plate 52, symbol B is the height in the vertical direction of the inclined plate 52, and symbol D is the average particle size of the coal as the raw material.

In the test, when the angle θ is 30 °, 40 °, 50 °, 70 °, and 90 °, and coal is cut out for one month, “the presence or absence of falling coal”, “in the skirt device” We investigated the presence / absence of wear on the inclined plate, the presence / absence of scratches on the belt due to the biting of coal in the gap between the hopper skirt device and the belt, and the overall evaluation.
The test results are shown in Table 1.

In Table 1, with regard to the presence or absence of charcoal, ○ when there is no charcoal, Δ when there is a small amount of charcoal, × when the amount of charcoal is large, x, whether there is wear on the inclined plate, wear ○, when there is no wear, △ when there is little wear, × when there is a lot of wear, as for the presence or absence of scratches on the belt, ○ when there is no scratch, △ when there are few but few scratches, many scratches In the comprehensive evaluation, the case where it was most preferable was rated as ◎, the case where it was preferable as ◯, the case where it was possible as Δ, and the case where it was impossible as x.
Referring to Table 1, when the angle θ was 40 ° or less, there was charcoal removal. This is because the vertical height B of the inclined plate 52 is high, the horizontal length A of the inclined plate 52 is short, and B / A is large, so that coal enters the gap 53 below the inclined plate 52. This is because it easily falls through the gap 53.

When the angle θ was 70 ° or more, the inclined plate 52 was worn. This is because the horizontal length A of the inclined plate 52 is long, and coal falling from above is likely to collide somewhat.
Further, when the angle θ was 30 ° and 90 °, the belt 3b was damaged. This is because when the angle θ is 30 °, the vertical height B of the inclined plate 52 is high and B / D is large, so that coal enters the gap 53 below the inclined plate 52 and the inclined plate 52 This is because it is bitten between the belt 52 and the belt 3b. When the angle θ is 90 °, since the vertical height B of the inclined plate 52 is low and B / D is small, the gap 53 under the inclined plate 52 is too narrow and the inclined plate 52 and the belt This is because coal is easily bitten between 3b.

As described above, it was found that the angle θ is 40 ° to 70 °, and that the angle θ is 50 ° is most preferable. Further, it was found that when the angle θ is 30 °, it is not preferable, but the arrangement angle of the inclined plate 52 is possible.
On the other hand, when the angle θ is 90 °, the inclined plate 52 extends in the horizontal direction from the lower end of the mounting plate 51 to the inside of the skirt portion 4, and it may not be possible to arrange the inclined plate 52. all right.

1 fixed quantity cutting device 2 hopper 3 feeder conveyor (belt conveyor)
3a carrier roll 3b belt 4 skirt portion 5 hopper skirt device 6 attachment means 51 attachment plate 51a attachment portion 52 inclined plate 53 gap 61 fixing member 62 fixing bolt 63 head 64 nut 65 cotter piece 66 cotter pin 100 loader 110 belt conveyor 120 quantitative cutout Equipment 121 Hopper 122 Feeder conveyor 122a Carrier roll 122b Belt 123 Scale conveyor 124 Splash prevention chute 125 Skirt portion 126 Hopper skirt equipment 127 Mounting means 130 Carbon breaker 131 Belt conveyor 132 Belt conveyor 140 Coke oven 220 Fixed quantity cutout apparatus 221 Hopper 222 Feeder conveyor 222a carrier roll 222b belt 223 skirt 224 hoppers Over winding device 225 cylindrical pipe 226 cylindrical pipe fixing member 226a stiffener 227 attachment means 228 fixing bolt 230 nut 231 nut 232 fixing member 229 cotters piece 233 cotter pin a coal (raw material)
L Length of the inclined plate δ Clearance A Horizontal length of the inclined plate B Height of the inclined plate in the vertical direction D Average particle size of coal

Claims (2)

A hopper for cutting out the raw material, a belt conveyor installed below the hopper for conveying the raw material cut out from the hopper, and provided at the lower part of the hopper to prevent the raw material from falling from the outside of the belt conveyor A hopper skirt device used in a quantitative cutout device having a skirt portion to perform,
A mounting plate that extends in the vertical direction and the conveying direction of the belt conveyor and is attached to the outer surface of the skirt portion so as to open a gap with respect to the belt of the belt conveyor, and the inner side of the skirt portion from the lower end of the mounting plate A hopper skirt device for a quantitative cutout device, characterized in that an inclined plate extending obliquely upward and extending in the conveying direction of the belt conveyor is provided.   The hopper skirt device for a quantitative cutout device according to claim 1, wherein the inclined plate extends from the mounting plate at an angle of 40 ° to 70 ° with the mounting plate.

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