JP2008001435A - Charcoal feeder - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a charcoal feeder capable of preventing a sludge carried accompanying with a charcoal from dropping rearward of a belt conveyor with a simple constitution. <P>SOLUTION: The charcoal feeder 10 is provided with a belt conveyor 12 for feeding the charcoal to a mill; a casing for storing the belt conveyor 12 and provided with a discharge nozzle connected to a charcoal feeding pipe of a charcoal storage tank and leading the charcoal to a mill 4; and a side hood 31 for preventing the charcoal from dropping rearward 18 of the belt conveyor 12 in the casing. The side hood 31 is provided with a plurality of flexible bodies 54 having at least an upper part fixed and a lower part pivotable in a longitudinal direction of the belt conveyor 12. The plurality of flexible bodies 54 are arranged in a short direction of the belt convey 12 without a gap, and a lower end of the flexible body 54 and an upper end of the belt conveyor 12 have a predetermined clearance. <P>COPYRIGHT: (C)2008,JPO&amp;INPIT

Description

  The present invention relates to a coal feeder for controlling the amount of coal supplied from a coal bunker to a mill used in a pulverized coal burning boiler or the like.

  FIG. 5 is a diagram showing a part of a schematic configuration of a coal supply facility 1 that supplies coal to a pulverized coal burning boiler used in a thermal power plant or the like. As is well known, in a pulverized coal combustion apparatus using pulverized coal as a fuel, such as a thermal power plant, the coal stored in the coal yard is transported to the coal bunker 2 by a conveyor, stored once here, and further below the coal bunker 2 The coal is fed to the mill 4 via the coal feeder 3 provided in the slab. After the coal is pulverized and classified, the pulverized coal of a predetermined size is conveyed to a boiler (not shown) and burned.

  Several types of equipment have been developed for coal feeders, such as table feeders, screw feeders, and belt feeder types. However, belt feeder type coal feeders are often used for pulverized coal combustion equipment used in power plants. in use. The belt feeder type coal feeder 3 houses a belt conveyor 12 in a casing 11, and an opening 13 is formed in the vicinity of one end portion of the upper surface of the casing 11, and the coal bunker 2 covers the opening 13. The coal supply pipe 15 is attached. Further, a discharge nozzle 16 for supplying coal to the mill 4 is provided near the other end of the bottom surface of the casing 11. Further, the coal feeder 3 includes a measuring device (not shown), increases or decreases the number of times of the belt conveyor 12 according to the load of the boiler, receives the coal from the coal supply pipe 15, and receives a predetermined amount of coal through the discharge nozzle 16. Supply to mill 4. In addition, a hood is attached to the inside of the casing 11 in order to prevent the coal supplied from the coal bunker 2 from falling to the rear 18 and the side 17 of the belt conveyor 12. The hood is composed of a side hood 21 that covers the rear surface and a guide hood (not shown) that covers the side surface, the front surface is open, and the side hood 21 is attached almost directly below the coal supply pipe 15.

  When the coal stacked in the yard is supplied to the boiler using the coal supply facility 1 configured as described above, moisture contained in the coal is sent to the mill 4 as it is through the coal feeder 3. Since this moisture has an adverse effect on the mill 4, a method for solving this has been proposed (see, for example, Patent Document 1). In this method, the coal supply pipe is extended into the casing so as to have a divergent cone shape, and an annular gutter for receiving water flowing along the inner wall surface of the coal supply pipe is provided in the vicinity of the lower end of the coal supply pipe. In addition, a drain pipe that guides the water that has flowed down to the outside of the casing is provided at the bottom of the annular trough. From this, it becomes possible to send coal to the mill in a state where the moisture contained in the coal is reduced, and there are excellent effects such as reduction in the drying time of coal in the mill.

The coal feeder 3 has another problem. This means that sludge brought along with the coal accumulates at the rear 18 of the belt conveyor 12 of the coal feeder 3 and hinders the operation of the coal feeder 3. FIG. 6 is an enlarged view of the VI part of FIG. 5, and shows a state in which the sludge 70 is accumulated on the rear 18 of the belt conveyor 12 of the coal feeder 3. This sludge 70 is obtained by drying and hardening the sludge 70 brought along with the coal 60. The size of the sludge 70 falling to the rear 18 of the belt conveyor 12 is about 200 mm to 300 mm. It is. This size is larger than the gap d3 between the lower end 22 of the side hood 21 and the upper end 19 of the belt conveyor 12. When the sludge 70 falls and accumulates at the rear 18 of the belt conveyor 12, the sludge 70 contacts the belt conveyor 12 and inhibits the movement of the belt conveyor 12, so the operation of the coal feeder 3 is stopped, and the accumulated sludge 70 is removed. Removal work is required. Although this operation varies depending on the coal type of the coal 60, the moisture content of the coal 60, and the like, there are cases where the sludge 70 is taken out at a rate of about once a week.
Japanese Patent Laid-Open No. 11-76856

  A flexible member such as a rubber plate is attached to the lower part of the side hood 21 as a simple method for preventing the sludge 70 brought into the coal feeder 3 accompanying the coal 60 from falling to the rear 18 of the belt conveyor 12. A method may be considered in which the lower end of this member is brought into contact with the upper end 19 of the belt conveyor 12 to eliminate the gap d3 between the side hood 21 and the belt conveyor 12. However, in this method, sludge 70 or the like enters between the lower end of the flexible member and the upper end 19 of the belt conveyor 12, and a large load is applied to the belt conveyor 12. The belt conveyor 12 stops due to overload. Since the mechanism of the sludge 70 falling to the rear 18 of the belt conveyor 12 has not been sufficiently studied, there is no solution so far.

  The objective of this invention is providing the coal feeder which can prevent the sludge brought along with coal with a simple structure from falling behind a belt conveyor.

The present invention relates to a belt conveyor for supplying coal to a mill, a belt conveyor for storing the belt conveyor, and connected to a coal supply pipe of a coal storage tank for supplying coal to the belt conveyor, and the coal transported by the belt conveyor to the mill. A casing provided with a discharge nozzle for guiding, and installed in the casing, perpendicular to the longitudinal direction of the belt conveyor and below the coal supply pipe, preventing coal from falling behind the belt conveyor In a coal feeder comprising an upper end of a belt conveyor and a side hood having a predetermined gap,
The side hood includes a plurality of flexible bodies that are fixed at least at the top and swingable in the longitudinal direction of the belt conveyor. The plurality of flexible bodies are arranged without gaps in the short direction of the belt conveyor. The coal feeder is characterized in that a lower end of the flexible body and an upper end of the belt conveyor have a predetermined interval.

The present invention also provides a belt conveyor for supplying coal to the mill, a belt conveyor for storing the belt conveyor, and connected to a coal supply pipe of a coal storage tank for supplying the coal to the belt conveyor. A casing with a discharge nozzle leading to and mounted in the casing perpendicular to the longitudinal direction of the belt conveyor and below the coal supply pipe to prevent coal from falling behind the belt conveyor In a coal feeder comprising an upper end of the belt conveyor and a side hood having a predetermined gap,
The side hood includes two upper and lower third hoods, the upper side hood is a plate-like body fixed to the casing, and the lower side hood is fixed to the lower part of the upper side hood and the lower part is the length of the belt conveyor. A plurality of flexible bodies swingable in a direction, and the plurality of flexible bodies are arranged without gaps in a short direction of the belt conveyor, and a lower end of the flexible body and an upper end of the belt conveyor It is a coal feeder characterized by having a predetermined interval.

  Further, the present invention is characterized in that, in the coal feeder, the plurality of flexible bodies are formed by providing a plurality of slits in one plate-like flexible body.

  Moreover, the present invention is characterized in that, in the coal feeder, the upper side hood has a zigzag shape with a lower portion cut out in a mountain shape.

  According to the present invention, in the coal feeder provided with the side hood that prevents the coal from falling to the rear of the belt conveyor, the side hood has a plurality of at least an upper portion fixed and a lower portion that can swing in the longitudinal direction of the belt conveyor. Therefore, even if sludge adheres to the flexible body, if the flexible body swings, tensile or compressive stress acts on the surface of the flexible body. As a result, the adhesion force between the sludge and the attached flexible body is weakened, and the sludge is peeled off from the side hood before it wraps around the back side of the side hood, thus preventing the sludge from falling behind the belt conveyor. it can. Therefore, unlike the conventional coal feeder, the sludge that has adhered to the side hood does not fall behind the belt conveyor, and there is no need to stop the coal feeder and remove them. Furthermore, since the side hood is composed of a plurality of flexible bodies, each flexible body swings freely. As a result, the sludge adhering to the side hood is more easily peeled off. Further, the plurality of flexible bodies are arranged without gaps in the short direction of the belt conveyor, and the lower end of the flexible body and the upper end of the belt conveyor have a predetermined interval, so that the coal supplied through the coal supply pipe is , Do not fall behind the belt conveyor. Moreover, since the structure of a side hood is simple, it can be implemented at low cost and can be easily applied to an existing coal feeder.

  Further, according to the present invention, the plurality of flexible bodies can be formed at a low cost and easily because a plurality of slits can be formed on a single plate-like flexible body.

  According to the present invention, the upper side hood has a zigzag shape with the lower part cut off in a mountain shape, so that the lower side hood can swing more freely. Thereby, it becomes possible to peel the sludge adhering to the side hood before it wraps around the back surface of the side hood, and the dried sludge does not fall and accumulate behind the belt conveyor.

  1, 2, and 3 are perspective views showing a part of a schematic configuration of a coal feeder 10 as an embodiment of the present invention, and a cross-sectional view showing a part of the schematic configuration of the coal feeder 10. FIG. 4 is a perspective view showing a part of the hood 30 and a state where the second side hood 50 is removed. The same members as those in FIGS. 5 and 6 are denoted by the same reference numerals, and detailed description thereof is omitted.

  The basic structure of the coal feeder 10 shown in the present embodiment is the same as that of the conventional coal feeder 3 shown in FIGS. 5 and 6, and the coal feeder 10 has a belt conveyor 12 in a substantially rectangular parallelepiped casing 11. In the vicinity of one end of the upper surface of the casing 11, an opening (not shown) for receiving coal is formed. A coal supply pipe of a coal bunker (not shown) is connected to the opening (not shown), and the coal is supplied to the mill through a discharge nozzle provided near the other end of the bottom surface of the casing 11. The coal feeder 10 includes a weighing device (not shown), increases or decreases the rotation speed of the belt conveyor 12 according to the load on the boiler, and supplies a predetermined amount of coal to the mill. A hood 30 for preventing the coal supplied from the coal bunker from falling to the rear 18 and the side 17 of the belt conveyor 12 is attached inside the casing 11. The hood 30 includes a side hood 31 that covers the rear surface and a guide hood 32 (32a, 32b) that covers the side surface, and the front surface is open. The side hood 31 is attached below the coal supply pipe (not shown) so as to be substantially flush with the wall surface of the coal supply pipe. These points are the same as the hood of the conventional coal feeder 3.

  The charcoal feeder 10 is characterized by the structure, shape, and mounting procedure of the hood 30 for preventing the coal 60 from falling to the rear 18 and the side 17 of the belt conveyor 12, particularly the side hood 31. The side hood 31 is composed of side hoods mounted in two upper and lower stages. The upper part is a first side hood 40 fixed to the inner wall of the casing 11, and the lower part is a lower part 41 of the first side hood 40. A fixed second side hood 50 is provided.

  The first side hood 40 is a metal plate and is fixed to the inner wall of the casing 11 so as to be orthogonal to the longitudinal direction of the belt conveyor 12. The lateral width of the first side hood 40 is slightly narrower than the lateral width of the belt conveyor 12. Further, the first side hood 40 has a shape feature in that a part of the lower portion 41 is cut into a plurality of mountain shapes to form a zigzag, and the distance d1 between the upper end 19 and the lower end 42 of the belt conveyor 12 is conventional. It is larger than the coal feeder 3 of.

  The second side hood 50 is a plate-like body made of a flexible member, such as a rubber plate, and has a substantially rectangular shape. The lateral width is substantially the same as that of the first side hood 40, and is fixed to the lower portion 41 of the first side hood 40 by a presser plate 36 and a bolt nut 37. The second side hood 50 is provided with slits 51 in the vertical direction. A plurality of slits 51 are provided in the width direction of the belt conveyor 12, and seven slits are provided in the present embodiment. Further, a hole 53 is formed in the upper end portion of the slit 51. Since the second side hood 50 is fixed to the first side hood 40 so that the upper end of the slit 51 substantially coincides with the lower end 42 of the first side hood 40, the eight strips 54 are independent of each other. And can move. In particular, since there is no other member that restricts the movement of the belt conveyor 12 in the longitudinal direction, the lower portion 57 can swing freely. The distance d2 between the upper end 19 of the belt conveyor 12 and the lower end 52 of the second side hood 50 is substantially the same as the distance d3 between the lower end 22 of the side hood 21 of the conventional coal feeder 3 and the upper end 19 of the belt conveyor 12. It is.

  Next, the function of the side hood 31 shown in this embodiment will be described together with an assumed mechanism in which the sludge 70 adheres to and peels from the side hood 31. FIG. 4 is a diagram for explaining an assumed mechanism in which the sludge 70 attached to the second side hood 50 of the coal feeder 10 peels from the second side hood 50. FIG. 7 is a view for explaining an assumed mechanism in which the sludge 70 attached to the side hood 21 of the conventional coal feeder 3 peels from the side hood 21. In the conventional coal feeder 3, the mechanism in which the sludge 70 accompanied by the coal 60 and sent to the coal feeder 3 is solidified and falls to the rear 18 of the belt conveyor 12 is assumed as follows.

  When the coal 60 containing moisture is sent to the coal feeder 3 like the coal 60 stored outdoors, the sludge 70 brought into the coal feeder 3 along with the coal adheres to the side hood 21. The sludge 70 also includes viscous ones, and the sludge 70 grows with increasing adhesion amount with the operation time of the coal feeder 3. Since the side hood 21 of the coal feeder 3 is mounted in the casing 11 and the casing 11 is sealed, the heat of the mill 4 is transmitted to the sludge 70 attached to the side hood 21 and is included in the sludge 70. The water evaporates and the sludge 70 becomes dry and hard. Although the coal 60 supplied from the coal supply pipe 15 collides with the side hood 21, the sludge 70 which is dried and firmly attached to the side hood 21 does not peel from the side hood 21 with such an impact force. When the coal 60 is supplied to the coal feeder 3 and further time elapses, the sludge 70 wraps around the back surface 23 of the side hood 21 while taking in the sludge 70 accompanying the coal 60 and grows to a certain size. A part of which contacts the upper end 19 of the belt conveyor 12. From this, an impact is applied to the sludge 70, and the crack 71 enters and is peeled off from the side hood 21 at the same time. At this time, the sludge 70b located on the back surface 23 of the side hood 21 does not move forward even if the side hood 21 falls on the belt conveyor 12 due to the obstacle, and eventually falls to the rear 18 of the belt conveyor 12. It is guessed.

  On the other hand, the mechanism by which the sludge 70 peels from the side hood 31 of the coal feeder 10 shown in this embodiment is inferred as follows. Since the first side hood 40 is made of a metal plate and is fixed to the inner wall of the casing 11, the sludge 70 attached to the first side hood 40 is caused by its own weight as in the conventional coal feeder 3. The wall of the hood 40 flows down. At this time, some sludge 70 grows while taking in other sludge 70. The sludge 70 that has reached the lower end 42 of the first side hood 40 further flows down the wall surface of the second side hood 50. At this time, since the lower end 42 of the first side hood 40 has a zigzag shape, the sludge 70 concentrates on the protrusion and moves mainly from here to the second side hood 50. The sludge 70 adhering to the second side hood 50 grows with time like the conventional coal feeder 3 and solidifies by receiving heat from the mill 4.

  Since the second side hood 50 is composed of a plurality of flexible strips 54 with the upper part 56 fixed and the lower part 57 not fixed, the collision of the coal 60 with the strips 54, or Each strip 54 can swing independently in the longitudinal direction of the belt conveyor 12 by the vibration of the coal feeder 10. When the strip 54 is bent, a tensile stress or a compressive stress is generated on the surface of the strip 54, and the surface of the strip 54 is expanded and contracted. On the other hand, the second side hood 50, that is, the sludge 70 attached to the strip 54 is solidified and cannot be stretched and shrunk in the same manner as the strip 54, so the sludge 70 is the second side hood. Peel from 50. As a result, the sludge 70 grows greatly, and it is assumed that the sludge 70 does not fall to the rear 18 of the belt conveyor 12 by peeling off the sludge 70 before it enters the back surface 55 of the second side hood 50.

  From these things, in order to prevent the sludge 70 from falling to the rear 18 of the belt conveyor 12, the second side hood 50 comes into contact with the coal 60 supplied or bends due to the vibration of the casing 11, and is caused on the member surface. It is necessary for tensile stress or compressive stress to occur. In the second side hood 50 shown in the present embodiment, since the upper part 56 is fixed and the lower part 57 is not fixed, the deflection amount of the member can be considered in the same manner as the bending of the cantilever beam. The amount of deflection of the strip 54 is expressed as a function of the load applied to the strip 54 and its position, the shape (length, thickness, width) of the strip 54 and the elastic modulus. In order to bend greatly with a small load, it is preferable that the strip 54 has a long length, a narrow width, a thin thickness, and a small elastic coefficient. When these are applied to the coal feeder 10 of the present embodiment, the distance d1 between the lower end 42 of the first side hood 40 and the upper end 19 of the belt conveyor 12 is increased, and the second lower portion 41 of the first side hood 40 is connected to the second side 41. By fixing the upper portion 56 of the side hood 50, the distance between the fixed portion of the second side hood 50 and the free end is increased, and the second side hood 50 can be appropriately bent. Moreover, in the coal feeder 10 shown in this embodiment, since the vertical slit 51 is provided in the second side hood 50 and the second side hood 50 is formed as an assembly of strip-shaped members, The width is narrow and can be bent sufficiently. This has been demonstrated in the examples described later.

  Furthermore, when the second side hood 50 is an assembly of strip-shaped members, the strips 54 move apart, so that the sludge 70 is easily peeled off. For example, even if one strip 54 bends the lower end 52 forward of the belt conveyor 12, the adjacent strip 54 may not bend the lower end 52 forward of the belt conveyor 12 in accordance with this. On the contrary, the lower end 52 may be bent at the rear 18 of the belt conveyor 12. Therefore, even if the sludge 70 adheres to two adjacent strips 54, the sludge 70 is peeled off. Also from this point, it can be said that the second side hood is preferably a collection of strips. In addition, the strip shape here does not necessarily mean only a thin vertically long shape, but also includes a shape that is wide and close to a square. Also in the examples described later, the length and breadth of one strip-shaped member is about 1.1 times.

  On the other hand, since the original role of the side hood 31 is to prevent the supplied coal 60 from falling to the rear 18 of the belt conveyor 12, the specification of the second side hood 50 is determined in consideration of this point. There is a need. For example, if the thickness of the second side hood 50 is extremely reduced, the amount of deflection increases, but the coal 60 cannot be prevented from falling to the rear 18 of the belt conveyor 12. Similarly, the same applies to the case where a large number of slits 51 are provided in the vertical direction of the second side hood 50 and the width is extremely narrowed. Further, in the state where the second side hood 50 is bent, no stress acts on the contact surface between the attached sludge 70 and the second side hood 50, and the sludge 70 does not peel off. Therefore, the second side hood 50 needs to be a member that can return to its original state when the load is removed.

  Furthermore, the distance d2 between the lower end 52 of the second side hood 50 and the upper end 19 of the belt conveyor 12 needs to be appropriately determined according to the particle size of the coal 60 so that the coal 60 does not fall to the rear 18 of the belt conveyor 12. is there. In order to prevent the coal 60 from falling to the rear 18 of the belt conveyor 12, the distance d2 between the lower end 52 of the second side hood 50 and the upper end 19 of the belt conveyor 12 should be narrow, but if it is extremely narrow, Care must be taken because coal 60 or sludge 70 is caught in the gap and the belt conveyor 12 may stop due to overload.

  In the said embodiment, although the example which provides the slit 51 in the 1st flexible body and forms the several strip-shaped body 54 was shown for the 2nd side hood 50, the formation method of the 2nd side hood 50 is this The method is not limited. The second side hood 50 may be formed by arranging the strips 54 made of a flexible material having a predetermined shape and size without gaps in the short direction of the belt conveyor 12.

Example 1
Hereinafter, an example in which the present invention is applied to a coal feeder actually operated at a power plant will be described. Table 1 shows the specifications of the coal feeder 10. In addition, the structure of the coal feeder 10 is the same as the coal feeder shown in FIGS.

The side hood 31 was attached to the coal feeder 10 in the following manner. Table 2 shows the dimensions and the like of the side hood.

  As shown in Table 2, the first side hood 40 is a metal plate having a width of 570 mm and a thickness of 3 mm, and is attached so that the distance d1 between the lower end 42 and the upper end 19 of the belt conveyor 12 is 80 mm. . Moreover, the lower part 41 of the 1st side hood 40 was continuously cut off in the width direction at four places, and it cut into the mountain shape (refer FIG. 3). At this time, the height from the lower end 42 to the top of the mountain was 15 mm. Furthermore, guide hoods 32 a and 32 b for preventing the coal 60 from falling are provided on both side surfaces of the first side hood 40. As the second side hood 50, a commercially available general rubber plate, a rubber plate made of natural rubber (NR) having a thickness of 3 mm was used. In the second side hood 50, seven slits 51 having a length of 80 mm in the vertical direction were put in the width direction, and eight strips 54 having a lateral width W2 of about 71.3 mm were formed. Further, a hole 53 having a diameter of 6 mm was formed at the upper end of each slit 51. The rubber plate was fixed to the first side hood 40 by using the holding plate 36 and the bolt nut 37 so that the upper end of the slit 51 coincided with the lower end 42 of the first side hood 40. At this time, the distance d2 between the lower end 52 of the second side hood 50 and the upper end 19 of the belt conveyor 12 was 16 mm. When this coal feeder 10 was used, the sludge 70 did not fall at all at the rear 18 of the belt conveyor 12 over a long period of time.

Comparative Example 1
The second side hood 50 is the same as the first embodiment except that the vertical slit 51 is not provided. When the coal feeder was operated using this side hood, the sludge 70 fell on the rear 18 of the belt conveyor 12 as in the conventional coal feeder.

It is a perspective view which shows a part of schematic structure of the coal feeder 10 as one Embodiment of this invention. It is sectional drawing which shows a part of schematic structure of the coal feeder 10 as one Embodiment of this invention. It is a perspective view which shows a part of food | hood 30 of the coal feeder 10 as one Embodiment of this invention, Comprising: It is a figure which shows the state which removed the 2nd side hood 50. FIG. It is a figure for demonstrating the assumption mechanism in which the sludge 70 adhering to the 2nd side hood 50 of the coal feeder 10 of FIG. It is a figure which shows a part of schematic structure of the coal supply equipment 1 which supplies coal to the pulverized-coal-fired boiler used in a thermal power plant. It is an enlarged view of the VI section of Drawing 5, and is a figure showing signs that sludge 70 has accumulated in back 18 of belt conveyor 12 of conventional coal feeder 3. It is a figure for demonstrating the assumption mechanism in which the sludge 70 adhering to the side hood 21 of the conventional coal feeder 3 peels from the side hood 21. FIG.

Explanation of symbols

2 Coal bunker 4 Mill 10 Coal feeder 11 Casing 12 Belt conveyor 15 Coal supply pipe 16 Discharge nozzle 18 Belt conveyor rear 19 Belt conveyor upper end 30 Hood 31 Side hood 40 First side hood 41 Lower part 50 of the first side hood Second side Hood 51 Slit 52 Lower end of second side hood 54 Strip 56 Upper part of second side hood 57 Lower part of second side hood 60 Coal 70 Sludge

Claims (4)

A belt conveyor for supplying coal to the mill, and a discharge nozzle for storing the belt conveyor and connected to a coal supply pipe of a coal storage tank for supplying the coal to the belt conveyor, and leading the coal transported by the belt conveyor to the mill A casing comprising: an upper end of the belt conveyor mounted within the casing and perpendicular to the longitudinal direction of the belt conveyor and below the coal supply pipe to prevent the coal from falling behind the belt conveyor And a side hood having a predetermined gap,
The side hood includes a plurality of flexible bodies that are fixed at least at the top and swingable in the longitudinal direction of the belt conveyor. The plurality of flexible bodies are arranged without gaps in the short direction of the belt conveyor. And a lower end of the flexible body and an upper end of the belt conveyor have a predetermined interval. A belt conveyor for supplying coal to the mill; and a discharge nozzle for storing the belt conveyor and connected to a coal supply pipe of a coal storage tank for supplying coal to the belt conveyor, and for guiding the coal transported by the belt conveyor to the mill. A casing comprising: an upper end of the belt conveyor mounted within the casing and perpendicular to the longitudinal direction of the belt conveyor and below the coal supply pipe to prevent the coal from falling behind the belt conveyor And a side hood having a predetermined gap,
The side hood includes two upper and lower third hoods, the upper side hood is a plate-like body fixed to the casing, and the lower side hood is fixed to the lower part of the upper side hood and the lower part is the length of the belt conveyor. A plurality of flexible bodies swingable in a direction, and the plurality of flexible bodies are arranged without gaps in a short direction of the belt conveyor, and a lower end of the flexible body and an upper end of the belt conveyor A coal feeder having a predetermined interval.   The coal feeder according to claim 1 or 2, wherein the plurality of flexible bodies are formed by providing a plurality of slits in a single plate-like flexible body. The coal feeder according to claim 2 or 3, wherein the upper side hood has a zigzag shape with a lower portion cut out in a mountain shape.

Images