Stoker furnace grate detachment prevention structure and stoker furnace

Abstract

To decrease the possibility of fire-grate drop-out caused by a treating object falling from above in the vicinity of the base end of the fire-grate for some reason.SOLUTION: The fire-grate dropout prevention structure of a stoker furnace 1 comprises a transfer passage with a plurality of movable steps 12 each including a plurality of fire-grates and a plurality of fixed steps 11 each including a plurality of fire-grates, that are alternately overlaid stepwise. The fire-grate dropout prevention structure comprises a plurality of attachment parts 40 each fitted to the base end side of a fire-grate to hold the fire-grate and to attach the fire-grate to the stoker furnace body or to a driving mechanism. Openings 30, 31 are provided at least in some of the attachment parts 40 to discharge treating object falling from above downward to decrease the amount of the treating object depositing in the gap formed on the fitted position of the fire-grate and the attachment part.SELECTED DRAWING: Figure 5

Description

Technical Field

[0001] The present invention relates to a structure for preventing the grate from falling off in a stoker furnace and a stoker furnace.

Background Art

[0002] A stoker furnace used for incinerating objects to be processed such as electronic component scraps is formed by alternately stacking in a stepped manner a movable stage in which a plurality of strip-shaped grates are arranged to be movable and a fixed stage in which a plurality of strip-shaped grates are also arranged. This stoker furnace transports the object to be processed while incinerating it by advancing and retreating the movable stage so as to slide on the surface of the fixed stage (see Patent Document 1 etc.).

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] In a conventional stoker furnace, when the object to be processed is fine, for example, it may fall downward from the gaps between the grates adjacent to each other on the fixed stage or the movable stage, or from the gaps of the steps of the fixed stage and the movable stage. Also, even if it was not fine initially, there was also a possibility that the object to be processed that entered the gap of the step and was refined (pulverized) by the sliding between the fixed stage and the movable stage would fall downward from those gaps.

[0005] It has been found that if fine material that has fallen accumulates near the base end of the lower grate, it may adversely affect the mounting condition of the grate, and if the accumulation of the material exceeds a certain level, it may cause the grate to fall off. For example, as shown in Figure 4(A), a recess 11P is provided on the lower side of the base end of the grate (fixed grate) 11S that constitutes the fixed stage, and the fixed grate 11S is attached to the stoker furnace body by fitting the recess 11P with the protrusion 40P of the mounting part 40, the inventors of the present invention have found that fine material 2 gets into the gap between the recess 11P and the protrusion 40P, which are the fitting points P, and gradually accumulates, and as this accumulation progresses, it lifts the base end of the fixed grate 11S, as shown in Figure 4(B), worsening the mounting condition and eventually leading to its detachment (details of the explanation of Figure 4 will be described later).

[0006] Therefore, the present invention has been made in view of these problems, and aims to provide a grate detachment prevention structure for a stoker furnace and a stoker furnace that can reduce the possibility of the grate detaching due to a workpiece falling from above near the base end of the grate for any reason. [Means for solving the problem]

[0007] To achieve the above objective, the grate fall prevention structure according to the present invention is a grate fall prevention structure for a stoker furnace equipped with a transport path in which movable and fixed stages, each containing a plurality of grates, are arranged alternately in a stepped manner, and is characterized in that it is equipped with a mounting part for fitting into the original end side of each of the plurality of grates constituting the transport path to hold the grates and for attaching the grates to the stoker furnace body or drive mechanism, and at least some of the mounting parts are provided with an opening for discharging the material to be processed that falls from above downwards and reducing the amount of material to be processed that accumulates in the gap between the grates and the mounting part.

[0008] To achieve the above objective, in the grate fall prevention structure according to the present invention, at least a portion of the opening may be located vertically below the original end of the grate.

[0009] To achieve the above objective, in the grate fall prevention structure according to the present invention, the grate may be arranged with an inclination such that the tip side is lower than the base side.

[0010] To achieve the above objective, the grate fall prevention structure according to the present invention may further include a bypass path for transporting the material to be processed discharged downward from the opening together with the material to be processed transported in the transport path.

[0011] To achieve the above objective, in the grate fall prevention structure according to the present invention, the mounting portion includes a rectangular flat plate portion in plan view to hold a plurality of grates arranged in the width direction of the transport path, and ribs are erected on the flat plate portion to maintain the strength of the mounting portion, and the opening may be provided on the flat plate portion so as to avoid the ribs.

[0012] To achieve the above objective, the stoker furnace according to the present invention is characterized by being equipped with any of the grate fall prevention structures according to the present invention. [Effects of the Invention]

[0013] The grate detachment prevention structure for a stoker furnace according to the present invention, or a stoker furnace equipped with the same, has an opening provided at a predetermined location in the mounting part that holds the original end of the grate, so that fine material to be processed that falls from above for any reason (for example, fine material to be processed that falls from the gaps in the upper grate or the gaps in the difference in height between the fixed and movable stages) is discharged downward. This reduces the amount of material to be processed that enters the fitting area between the grate and the mounting part, and has the effect of keeping the possibility of the grate detaching due to the accumulation of material to a minimum. [Brief explanation of the drawing]

[0014] [Figure 1] Figure 1 is a schematic side view of a stoker furnace. [Figure 2] Figure 2 is a schematic plan view of the transport path and surrounding area of ​​the stoker furnace. [Figure 3]Figure 3(A) is a schematic plan view of the trolley connected to the movable step, and Figure 3(B) is a schematic side view of the trolley. [Figure 4] Figure 4(A) is a schematic side view illustrating the fitting points between the fixed step and the mounting part, and Figure 4(B) is a diagram illustrating the cause of conventional fixed grates falling off. [Figure 5] Figure 5(A) is a schematic side view illustrating the location of the opening, and Figure 5(B) is a schematic top view illustrating the location of the opening. [Figure 6] Figure 6(A) is a plan view of the bracket for the upper fixed step, Figure 6(B) is a cross-sectional view of AA in Figure 6(A), and Figure 6(C) is a cross-sectional view of BB in Figure 6(A). [Figure 7] Figure 7(A) is a plan view of the bracket receiver for the upper fixed step, Figure 7(B) is a cross-sectional view of the CC section of Figure 7(A), and Figure 7(C) is a cross-sectional view of the DD section of Figure 7(A). [Modes for carrying out the invention]

[0015] The following describes a preferred embodiment of the grate fall prevention structure and stoker furnace for a stoker furnace according to the present invention.

[0016] [Overall configuration of the stoker furnace] First, the overall configuration of the stoker furnace will be explained with reference to the drawings. Figure 1 is a schematic side view of the stoker furnace, Figure 2 is a schematic plan view of the transport path and its surroundings, Figure 3(A) is a schematic plan view of the trolley connected to the movable stage, and Figure 3(B) is a schematic side view of the trolley. As shown in Figures 1 and 2, the stoker furnace 1 comprises a transport path 100 arranged so as to be surrounded by furnace walls 200, a hopper 300 located below the transport path 100, a trolley 20 connected to the movable stage 12 of the transport path 100, a drive mechanism 400 connected to the trolley 20, and a heating device (not shown) for heating the transport path 100.

[0017] As shown in Fig. 1, the conveying path 100 is an incineration conveying path arranged such that two movable steps 12, 12 and two fixed steps 11, 11 are stacked alternately in a stepped manner in the direction opposite to the conveying direction (the direction of the thick white arrow). Hereinafter, if necessary, the two movable steps 12, 12 will be referred to as the "lower movable step 12" and the "upper movable step 12" in order from the lower side, and the two fixed steps 11, 11 will also be referred to as the "lower fixed step 11" and the "upper fixed step 11" in order from the lower side.

[0018] As shown in Fig. 2, each of the fixed steps 11, 11 has a plurality of fixed fire grates 11S, 11S,... in the shape of a strip in plan view arranged side by side in the width direction of the conveying path 100. These fixed steps 11, 11 are fixed to the main body side (the side of the furnace wall 200) of the stoker furnace 1 via attachment parts 40, 40 respectively. Each of the fixed fire grates 11S, 11S,... is arranged with an inclination such that the tip side is lower than the base end side.

[0019] As shown in Fig. 2, each of the movable steps 12, 12 has a plurality of movable fire grates 12S, 12S,... in the shape of a strip in plan view arranged side by side in the width direction of the conveying path 100. These movable steps 12, 12 are fixed to the carriage 20 via attachment parts 40, 40 respectively. Each of the movable fire grates 12S, 12S,... is arranged with an inclination such that the tip side is lower than the base end side.

[0020] The carriage 20 is made to be able to move forward and backward in the left - right direction of Fig. 3 by a drive mechanism 400 connected thereto. When the carriage 20 moves forward and backward, the movable steps 12, 12 shown in Fig. 1 move forward and backward so as to slide on the surfaces of the fixed steps 11, 11 respectively. Thus, the object to be processed on the conveying path 100 is conveyed along the route shown by the thick white arrow in Fig. 1. The object to be processed conveyed by this conveying path 100 falls to the lower left of Fig. 1 and is then conveyed by a conveyor (not shown) or the like.

[0021] As shown in Figures 3(A) and (B), the trolley 20 has a frame structure with beams 22 and 23 arranged in a stepped pattern, and supports the movable steps 12 and 12 (Figure 1) via mounting parts 40 and 40 provided on the beams 22 and 23. The dashed lines in Figure 3(B) show the approximate positional relationship between the beams 22 and 23 of the trolley 20, the movable steps 12 and 12, and the mounting parts 40 and 40. In the example shown in Figure 3, the beam 22 located at the lower level of the trolley 20 (which constitutes part of the mounting part 40) is provided with openings 32, 32, and 32 as a structure to prevent the grate from falling off. The layout (opening pattern) of these openings 32, 32, and 32 is merely an example and can be changed as needed. Details of the mounting part 40 and the structure to prevent the grate from falling off are described below.

[0022] [Overview of the mounting section and grate fall prevention structure] Next, an overview of the mounting portion and the grate fall prevention structure will be described. The grate fall prevention structure in this embodiment is mainly provided on the mounting portion 40. Here, as a representative example, the grate fall prevention structure provided on the mounting portion 40 of a specific fixed stage 11 will be described, but similar fall prevention structures may also be provided on the mounting portions 40 of other fixed stages 11 or movable stages 12.

[0023] Figure 4(A) is a schematic side view illustrating the fitting points between the fixed step and the mounting part, Figure 4(B) is a diagram illustrating the cause of the conventional fixed grate falling off, Figure 5(A) is a schematic side view illustrating the location where the opening is formed, and Figure 5(B) is a schematic plan view illustrating the location where the opening is formed.

[0024] The mounting portion 40 shown in Figure 4(A) includes a bracket 40B and a bracket receiver 40M. Bracket 40B is a steel material, such as iron, that fits into the lower end of the fixed grates 11S, 11S, ... that constitute the fixed stage 11 and holds these fixed grates 11S, 11S, ... in place. In particular, in the examples shown in Figures 4(A) and 5(A), recesses 11P are provided on the lower end of each fixed grate 11S, 11S, ..., so bracket 40B has a flat plate-shaped protrusion 40P that fits into these recesses 11P. Bracket 40B also has a substantially horizontal flat plate portion 40H, and the overall shape including the flat plate portion 40H is substantially a horizontal T-shape in cross-section.

[0025] The bracket receiver 40M is a steel material, such as iron, that is fixed to the lower surface of the flat plate portion 40H of the bracket 40B with bolts or the like, and its shape is roughly a downward-facing U-shape in cross-section. This bracket receiver 40M is fixed to the main body of the stoker furnace 1 via a frame (beam material, girder material, etc.) not shown.

[0026] Conventionally, as shown in Figure 4(B), the material to be processed 2 would get trapped in the fitting point P between the fixed grates 11S, 11S, ... and bracket B. As this accumulated, the base end of the fixed grates 11S, 11S, ... would gradually lift up, resulting in an inappropriate posture and loss of balance. This could cause the fitting between the recess 11P and the protrusion 40P to disengage, potentially leading to the fixed grates 11S falling off. Furthermore, because the fixed grates 11S, 11S, ... were arranged with a slope such that the tip end was lower than the base end, there was a higher possibility that the material to be processed 2 would get trapped in the fitting point P.

[0027] Therefore, as shown in Figures 5(A) and (B), the flat plate portion 40H of the bracket 40B that constitutes the mounting portion 40 of this embodiment is provided with a plurality of openings 30, 30, 30, ... Furthermore, openings 31, 31, ... are also provided in the ceiling portion (the surface to which the bracket 40B is fixed) of the bracket receiver 40M that constitutes the mounting portion 40 of this embodiment. Note that the layout (opening pattern) of the opening 30 in the flat plate portion 40H of the bracket 40B and the layout (opening pattern) of the opening 31 in the ceiling portion of the bracket receiver 40M do not need to be exactly the same. Furthermore, the openings 30,30,30,... provided in the bracket 40B of the mounting section 40 and the openings 31,31,31,... provided in the bracket receiver 40M have the function of discharging the workpieces 2,2,... that fall downward from gaps in the transport path 100 located above the mounting section 40 (such as the gaps between the movable grates 12S,12S or the gap between the fixed grate 11S and the movable grate 12S), thereby reducing the amount of workpieces 2 that enter the gaps of the fitting section P. In other words, the openings 30,30,... provided in the bracket 40B of the mounting section 40 and the openings 31,31,... provided in the bracket receiver 40M function as a grate fall prevention structure.

[0028] Furthermore, the formation locations of the openings 30, 30, ... in the bracket 40B and the openings 31, 31, ... in the bracket receiver 40M should preferably be as close as possible to the aforementioned fitting location P in the bracket 40B and bracket receiver 40M, and it is even more desirable that at least a portion of the openings 30, 30, ..., 31, 31, ... be located below the fitting location P. In other words, the openings 30, 30, ..., 31, 31, ... may be located on the forward side (upstream side) in the transport direction than the original end of the fixed grate 11, but it is even more desirable that at least a portion of the openings 30, 30, ..., 31, 31, ... be located vertically below the original end of the fixed grate 11S. Specifically, in the example shown in Figures 5(A) and (B), the openings 30, 30, ... of the bracket 40B extend to the backward side (downstream side) in the transport direction and penetrate to the underside of the fixed grate 11. Openings 30, 30, ... in these positions can effectively suppress the accumulation of the workpiece 2 at the fitting point P.

[0029] In this embodiment, the openings 31, 31, ... of the bracket receiver 40M may be extended to the back (downstream) side in the transport direction, similar to the openings 30, 30, ... of the bracket 40B, so as to fit under the fixed grate 11.

[0030] Furthermore, in the stoker furnace 1 of this embodiment, a hopper 300 is provided as part of the grate fall prevention structure, as shown in Figure 1. This hopper 300 is positioned below the stepped transport path 100 and can collect the material to be processed 2 discharged from the openings 30,30,...,31,31,... of the mounting sections 40,40,40,40 (see Figure 5), as indicated by the thin white arrows. The material to be processed 2 collected by the hopper 300 falls onto the aforementioned conveyor (avoidance path) and is transported together with the material to be processed 2 transported on the regular transport path 100. Therefore, the grate fall prevention structure of this embodiment also reduces the burden of removing the fine material to be processed 2 that has fallen through the gaps in the transport path 100.

[0031] In this embodiment, the openings (reference numerals 30, 31, 32) are provided on the bracket 40B, bracket receiver 40M, and beam 22 (see Figure 3) of the mounting portion 40, but are not limited to these locations. For example, if any of the movable steps 12 are directly attached to the trolley 20 via the bracket 40B, the bracket receiver 40M may be omitted. Also, if the area below the openings (reference numerals 30, 31) provided in the bracket 40 (and bracket receiver 40M) (the falling route of the object to be processed 2) is not obstructed by the beam of the trolley 20, it is not necessary to provide an opening (reference numeral 32) in that beam.

[0032] [Specific examples of brackets] Next, as a specific example of bracket 40B, we will explain the details of the structure of the bracket for the upper fixed step. Note that the structure of the upper fixed step bracket 40B described below can be applied to other brackets as well, but it can be modified in various ways depending on the mounting location and arrangement of the brackets. Figure 6(A) is a plan view of the bracket for the upper fixed step, Figure 6(B) is a cross-sectional view of AA in Figure 6(A), and Figure 6(C) is a cross-sectional view of BB in Figure 6(A). As shown in Figure 6, the upper fixed bracket 40B has a flat plate portion 40H that is fixed to the bracket receiver 40M (Figure 5(A)) and a plate-shaped protrusion 40P (corresponding to the aforementioned fitting location P) that fits into the aforementioned fixed grates 11S, 11S, ... (Figure 5(A)). The overall cross-sectional shape of the flat plate portion 40H and the plate-shaped protrusion 40P is a roughly horizontal T-shape as described above. The overall shape of the flat plate portion 40H and the plate-shaped protrusion 40P is a long rectangle in plan view in the width direction of the transport path 100 in order to hold the multiple fixed grates 11S, 11S, ... that are arranged in the width direction of the transport path 100. In the upper fixed step bracket 40B, ribs R, R, R, ... are erected between the surface side of the flat plate portion 40H and the plate-shaped protrusion portion 40P to maintain the strength of the bracket 40B. In addition, bolt holes 41, 41, ... are provided in the flat plate portion 40H of the upper fixed step bracket 40B for bolting the bracket 40B to the bracket receiver 40M (Figure 5). Therefore, the openings 30,30,... of the upper fixed bracket 40B are provided in the flat plate section 40H so as to avoid the ribs R,R,R,... and fixing bolt holes 41,41,... In other words, the ribs R,R,R,... and fixing bolt holes 41,41,... are provided so as to avoid the openings 30,30,... In any case, the relationship between the ratio of openings 30 in the flat plate section 40H (opening ratio) and the number of ribs R is selected so as to achieve a desired balance between the grate fall prevention function and the reduction in strength of the bracket 40B. Note that the pattern of openings 30,30,… shown in Figure 6 is just one example and can be changed as appropriate. For example, as shown in Figure 5(B) above, an opening 30 may be provided for each fixed grate 11S. Incidentally, in Figure 5(B), openings 30,30,… are provided in a part of the position where multiple fixed grates 11S,11S,… are attached in the width direction of the transport path 100 (that is, the width of each opening 30 is set to be narrower than the width of each fixed grate 11S), but it is preferable that openings 30 are provided in the entire area where at least one fixed grate 11S is attached in the width direction of the transport path 100 (that is, the width of each opening 30 is set to be equivalent to the width of each fixed grate 11S). This makes it possible to discharge the material to be processed 2 that accumulates near the original end of at least one fixed grate 11S downward over the entire width direction of the transport path 100. Furthermore, it is preferable that openings 30 are provided in the entire area of ​​the transport path 100 in the width direction where all fixed grates 11S are installed (that is, the width of the openings 30 is set to be wider than the width of the fixed grates 11S, and in some cases adjacent openings 30 are continuous). The above description of the pattern of openings 30 in the bracket 40B also applies similarly to the pattern of openings 31 in the bracket receiver 40M.

[0033] [Specific examples of bracket mounts] Next, as a specific example of the bracket receiver 40M, the structure of the bracket receiver for the upper fixed step will be described. Note that the structure of the bracket receiver 40M for the upper fixed step, as described below, can be applied similarly to other bracket receivers, but it can be modified in various ways depending on the mounting location and arrangement of the bracket receiver. Figure 7(A) is a plan view of the bracket receiver for the upper fixed step, Figure 7(B) is a cross-sectional view of the CC section of Figure 7(A), and Figure 7(C) is a cross-sectional view of the DD section of Figure 7(A). As shown in Figures 7(A), (B), and (C), the shape of the bracket receiver 40M for the upper fixed step is roughly U-shaped in cross-section, with the cross-section facing downwards. Here, inside the bracket receiver 40M for the upper fixed step, there are ribs (not shown) to maintain the strength of the bracket receiver 40M. In addition, the ceiling portion 40U of the bracket receiver 40M for the upper fixed step is provided with bolt holes 42, 42, ... for bolting the bracket receiver 40M to the bracket 40B (Figure 6). Therefore, the openings 31, 31, ... of the bracket receiver 40M for the upper fixed stage are provided in the ceiling portion 40U so as to avoid the ribs and fixing bolt holes 42, 42, ... which are not shown. In other words, the ribs and fixing bolt holes 42, 42, ... which are not shown are provided so as to avoid the openings 31, 31, ... In any case, the relationship between the ratio of the openings 31 in the ceiling portion 40U (opening ratio) and the number of ribs not shown is selected so as to achieve a desired balance between the function of preventing the grate from falling and the reduction in the strength of the bracket receiver 40M. Note that the pattern of openings 31, 31, ... shown in Figure 7 (opening pattern) is just one example and can be changed as appropriate.

[0034] [Effects of the Embodiment] As described above, the grate fall prevention structure according to this embodiment or the stoker furnace 1 equipped therewith has openings 30, 30, ..., 31, 31, ..., 32, 32, ... at predetermined locations in the mounting part 40 that holds the movable stage 12 or the fixed stage 11, so that fine material to be processed that falls from above for any reason (specifically, fine material to be processed 2 that falls from the gaps of the upper fixed grates 11S, 11S, ... or movable grates 12S, 12S, ... or the gaps in the step difference between the fixed stage 11 and the movable stage 12) is discharged downward, thereby reducing the amount of material to be processed 2 that enters the fitting location P between the grates 11S, 11S, ..., 12S, 12S, ... and the mounting part 40, and thus reducing the possibility of the grates 11S, 11S, ..., 12S, 12S, ... falling off due to the accumulation of material to be processed 2.

[0035] [Variations of opening shape] Although the openings 30, 31, and 32 depicted in Figures 3, 6, and 7 are all rectangular in plan view, the contour shape of the openings 30, 31, and 32 is not limited to this. The corners may be rounded, the contour may be curved, or it may be a polygonal shape other than a rectangle. However, considering ease of processing, it is considered desirable that the contour shape of the openings 30, 31, and 32 be rectangular in plan view or close to it.

[0036] [Example of a fitting joint] In the embodiment described above, a recess is provided on the underside of the grate and a protrusion is provided on the mounting side. However, it is also possible to provide a protrusion on the underside of the grate and a recess on the mounting side, or to modify the shape to something other than a recessed or convex shape. For example, the sides of the recess of the grate and the protrusion of the mounting side may be sloped to prevent the accumulation of the material to be processed. In other words, the shape of the fitting portion P can be modified in various ways as needed. Regardless of which shape is adopted, the problem of the grate falling off due to the accumulation of the material to be processed 2 may occur, so the grate fall prevention structure of this embodiment is effective.

[0037] [Modified view of the opening formation site] In the embodiments described above, the bracket 40B, bracket receiver 40M, and the beam 21 of the trolley 20 were given as examples of locations for forming the openings 30, 31, and 32, which are the grate fall prevention structures. However, if any member (such as a girder or beam) is placed in the space below the openings 30, 31, and 32 of the mounting portion 40 and above the hopper 300, an opening is also provided in that member to allow the workpiece 2 falling from above to pass through.

[0038] [others] As described above, preferred embodiments of the present invention have been explained in detail, but it goes without saying that the present invention is not limited to these specific embodiments, and various modifications and changes are possible within the scope of the gist of the present invention as described in the claims. For example, the number of fixed and movable stages, the number of grates arranged on the fixed or movable stages, etc., can be varied in various ways. [Explanation of Symbols]

[0039] 1. Stoker furnace 100 transport paths 11 Fixed stage 11P recess 11S fixed grate 12 movable stage 12S movable grate 2. Items to be processed 20 carts 200 Furnace wall 22 Beam 23 Beam 30 aperture 31 Aperture 32 Aperture 300 hoppers 40 Mounting part 400 Drive mechanism 40B Bracket 40H flat plate part 40M Bracket Mount 40P protrusion 40U Ceiling section 41 bolt holes 42 bolt holes P Fitting point R Rib

Claims

1. A structure for preventing grate detachment in a stoker furnace, which has a transport path in which movable and fixed stages, each containing multiple grates, are arranged alternately in a stepped manner, The mounting portion is provided for fitting into the original end side of each of the multiple grates constituting the transport path to hold the grates, and for attaching the grates to the stoker furnace body or drive mechanism. At least some of the aforementioned mounting sections are provided with openings to discharge the material being processed that falls from above downwards, thereby reducing the amount of material accumulating in the gap between the grate and the mounting section. A structure for preventing the grate from falling off a stoker furnace, characterized by the following features.

2. At least a portion of the opening is located vertically below the base end of the grate. The grate fall prevention structure for a stoker furnace according to feature 1.

3. The aforementioned grate is arranged with a slope such that the tip is lower than the base. The grate fall prevention structure for a stoker furnace according to feature 1.

4. The system further includes a bypass path for transporting the material to be processed, which is discharged downward from the opening, together with the material to be processed transported along the transport path. The grate fall prevention structure for a stoker furnace according to feature 1.

5. The mounting portion includes a rectangular flat plate portion in plan view to hold a plurality of fire grates arranged in the width direction of the transport path, and ribs are erected on the flat plate portion to maintain the strength of the mounting portion. The opening is provided in the flat plate portion so as to avoid the rib. The grate fall prevention structure for a stoker furnace according to feature 1.

6. A stoker furnace characterized by comprising a grate fall prevention structure as described in any one of claims 1 to 5.

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