JP2000179824A - Structure of fire grate piece and fire grate - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent blow-through of primary air at a sidewall of a furnace in association with a strain of a fire grate caused by a thermal strain while preventing a gap in association with a thermal deformation between fire grate pieces. SOLUTION: A stoker hearth of a refuse incinerating furnace has an upper surface 2 capable of forming a refuse mounting surface, an engaging part 9 extended down from the surface 2 and engaged with a support provided along a width direction, a lower receiver 3 freely superposed from above with opposed end of an adjacent fire grate piece disposed adjacent to one end side of a width direction to one end of the surface 2 in the width direction, and an upper superposing part 4 freely superposed from above on the opposed end of the adjacent piece disposed at the other end side of the width direction at the other end of the surface 2 in the width direction. The one part 4 adjacent in the continuous state in the width direction is superposed on the other adjacent receiver 3 to form the relatively movable superposed part at the end face in the width direction.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a grate piece and a structure of a grate, and more particularly, to a stoker type grate in a garbage incinerator provided with an upper surface portion capable of forming a garbage mounting surface. Engaging the engagement portion formed extending downward to the support portion provided along the width direction, a plurality of grate pieces arranged adjacent to the width direction, and a grate piece, The present invention relates to a structure of a grate in which a plurality of grate pieces are arranged adjacent to each other in the width direction of the grate piece.

[0002]

2. Description of the Related Art A conventional refuse incinerator is provided with a stoker-type grate that conveys refuse to be incinerated in the furnace to the downstream side while performing incineration processing. In order to transport garbage on this stoker type grate, a stoker mechanism is provided, as shown in FIG.
The stalker mechanism 14 includes a fixed frame 15 and a guide mechanism 14a that guides the fixed frame 15 in an oblique direction so as to ascend toward the downstream side before and after the dust transport direction.
The fixed frame 15 and the movable frame 16 are respectively provided with a frame 1.
7, a support 1 made of a rod-like body fixed in the width direction of the stoker mechanism 14 and orthogonal to the dust transport direction.
2 is provided. These support portions 12 are alternately arranged on the frame 17 of the frames 15 and 16 in the dust transport direction, and both ends are fixed. And each support part 1
2 is a grate in which a plurality of grate pieces 1 are densely arranged in the width direction while the locking portions 18 are locked, and a dust mounting surface 21 is formed on the upper surface 2 (see FIG. 9). A group of pieces 10 can be formed. The downstream end of the grate piece group 10 is:
The grate piece group 10 on the downstream side is slidably mounted on the grate piece group 10. Due to such arrangement of the grate pieces 1, a fixed grate piece group 10 formed by being fixed to the fixed frame 15.
A and a group of movable grate pieces 10B formed by being fixed to the movable frame 16 are alternately arranged in the dust transfer direction. In this stoker-type grate, if the movable frame 16 reciprocates obliquely back and forth with respect to the fixed frame 15 in the dust transport direction, the movable grate piece group 10B becomes the front and rear fixed grate piece group 10A. When the movable grate piece group 10B advances to the downstream side, the fixed grate is formed by an extruded end portion 10a formed at the tip of the movable grate piece group 10B. The dust on the dust mounting surface 21 of the piece group 10A is pushed out toward the downstream side in the transport direction. Further, when the movable grate piece group 10B retreats, dust on the dust placement surface 21 is directed toward the downstream side by an extruded end 10a formed at the tip of the fixed grate piece group 10A. And are relatively extruded. By the reciprocating operation of the movable grate piece group 10B, dust on the stoker type grate is transported toward the downstream side in the transport direction. With the above configuration, the fixed grate piece group 10A and the movable grate piece group 10B form the grate of the stoker-type grate.

The grate piece 1 used for the stoker-type grate is, as shown in FIG. 8 and FIG.
The upper surface portion 2 which is formed in a rectangular shape in a plan view (see FIG. 8) and on which the dust mounting surface 21 can be formed, and the front end portion of the upper surface portion 2 in the longitudinal direction is formed to extend downward. A front end portion 5 capable of forming an end portion 10a; and a plurality of reinforcing ribs 8 erected downward on the back side of the upper surface portion.
(Five sheets are shown in FIG. 9).
reference). The front end portion 5 is provided with a plurality of air supply ports 5a for supplying primary air supplied from below the stoker type grate to the refuse on the refuse mounting surface 21. The air is supplied through the space between each of the plurality of ribs 8 from the air supply port 5a toward the front garbage layer. Further, the front end is formed by forming the grate piece group 10 and slidably contacting the lower surface of the extruded end portion 10a on the dust mounting surface 21 of the grate piece group 10 on the downstream side. At the lower part of the portion 5, a sliding surface portion 6 is formed which is in contact with the upper surface portion 2 of another grate piece 1 to be in contact. The primary air also serves to cool the grate pieces 1 (especially the upper surface portion 2) heated by the burning of dust, thereby preventing the grate pieces 1 from burning. For this,
Each rib 8 is provided with a vent 8a for allowing primary air to flow between adjacent spaces. This prevents the upper surface portion 2 from being cooled unevenly in the width direction. In the illustrated example, the plurality of ribs 8
At the lower part on the rear end side of the center part and the ones on both sides, there are provided engaging portions 9 which can be externally engaged with the support portion 12 of the stoker mechanism 14. The ribs 8 on both ends are
Forming a contact end portion 7 when attached to the support portion 12;
The contact end face 7a of the adjacent grate piece 1 that contacts the opposing contact end part 7 is located between the contact end part 7 of the adjacent grate piece 1 in the arrangement state and the primary air from below. To prevent blow-through, it is formed on a machined plane.

[0004] In the stoker type grate constructed as described above, the primary air is supplied only from the front end 5 of the grate piece 1, so that the adjacent grate pieces 1 come into contact with each other. As shown in FIG. 10, a helical spring for elastically pressing the grate piece group 10 from both ends in the width direction is used on the side wall portion 22 of the furnace in order to bring the contact end surfaces 7a of the end portions 7 into close contact with each other. The pressing members 20 are pressed against both ends of the grate piece group 10, respectively, so that the contact end surfaces 7a of the respective grate pieces 1 are strongly pressed against each other to make close contact. . As described above, the grate pieces 1 are thermally expanded by burning the dust on the dust placement surface 21 while being pressed from the side wall portions 22 by the strong force, and as a result, the grate piece group 10 Even if is thermally expanded in the width direction, the pressing member 20 elastically retreats to the outside of the furnace in the width direction, so that the grate piece group 10 is maintained in a state close to an integrated object. Was The pressing member 2
Numeral 0 constitutes a part of the side wall portion 22 of the furnace, and has a width substantially equal to the arrangement interval of the grate piece group 10 in the front-rear direction. Are arranged at room temperature, and the grate piece group 10
Are slidably adhered to the contact end surfaces 7a of the grate pieces 1 arranged at both ends of the grate.

[0005]

In the conventional grate, the primary air for cooling the grate piece 1 flows from the rear end toward the front end 5, and the primary air for cooling the grate piece group 10 On the end side, there is the front end 5 side of the grate piece 1 disposed adjacently on the upstream side on the end side, so that the influence of heating by the combustion heat of the refuse that is cooled and incinerated on the refuse mounting surface 21 is affected. ,
As a result, the temperature of the grate piece 1 becomes larger at the front end portion 5 side and becomes smaller at the rear end side. The width of the front end 5 of the piece 1 is wider in the use state than the rear end. For this reason, as described above, the grate piece group 10 which is formed almost rigidly by the strong pressing force of the elastic pressing means 19 causes elastic deformation of the support portion 12 with its thermal expansion, Figure 1 exaggerated
As shown in FIG. 1, thermal deformation occurs in a fan shape in plan view.
Here, as described above, since the pressing member 20 has a width substantially equal to the arrangement interval of the grate piece group 10, the pressing member 20 is provided at the end of the grate piece group 10 disposed in front and back. , While maintaining the position substantially parallel to the wall surface of the side wall portion 22, and the thermally deformed grate piece group 10.
A gap is formed between the contact member 7 on the rear end side of the grate piece 1 and the pressing member 20 disposed at both side ends of the grate. In a garbage incinerator, the thickness of the garbage layer near the both side walls 22 where the garbage transport resistance is higher than that in the central part is usually thinner. If there is a gap in the part, it will promote the blow-through of primary air, which will hinder the maintenance of stable combustion in the furnace. Therefore, the grate piece and the structure of the grate according to the present invention solve the above problems, and maintain stable combustion of the furnace even if the grate piece is affected by heat with respect to the temperature rise of the grate. The purpose is to prevent trouble.

[0006]

[Means for Solving the Problems] [Characteristic Configuration of Grate Piece]
The first characteristic configuration of the grate piece according to the present invention for the above object, as described in claim 1, comprises an upper surface portion capable of forming a garbage mounting surface on a stoker type grate in a garbage incinerator, An engagement portion extending downward from the upper surface portion is engaged with a support portion provided along the width direction, and a plurality of the grate pieces arranged adjacent to each other in the width direction are provided with the upper surface portion. At the one end in the width direction, while forming a lower receiving portion capable of overlapping the opposing end of an adjacent grate piece arranged adjacent to the one end in the width direction from above, and forming the lower receiving portion of the upper surface portion At the other end in the width direction, an upper overlap portion that can be overlapped from above with respect to the opposing end of the adjacent grate piece disposed on the other end side in the width direction is formed, and is connected in the width direction. In this state, one of the adjacent upper overlapping portions is overlapped with the other adjacent lower receiving portion. In, lies in an end face in the width direction is formed configured to be able to relatively movable overlap portion in the width direction.

According to a second aspect of the present invention, a step-down portion having a lower upper surface is formed at one end in the width direction of the upper surface portion in the first characteristic configuration to form a lower receiving portion, and is continuously provided. It is even better if a substantially flat dust mounting surface can be formed in this state (the second characteristic configuration of the grate piece).

[Effects of the Grate Piece] According to the first feature of the grate piece, it is possible to prevent the occurrence of a gap between the grate pieces due to thermal deformation, and to prevent the occurrence of heat distortion. It is possible to prevent primary air from blowing through the furnace side wall due to distortion of the grate. In other words, by forming the overlapping portion, between the adjacent grate pieces, relative movement between the opposing ends of the two grate pieces is allowed, so that the arrangement interval of the two grate pieces is changed. It is possible to prevent the influence of the change in width due to the temperature difference between the front end side and the rear end side of each grate piece from affecting the adjacent grate pieces. In addition, since the overlapping portion is formed between the upper overlapping portion and the lower receiving portion, it is possible to prevent primary air from flowing through between the grate pieces. As a result, the combustion state of the furnace can be prevented from becoming abnormal due to the bias of the primary air, and stable combustion of the furnace can be maintained.

According to the second characteristic configuration of the grate piece, the shape of the grate piece is not changed depending on the location.
In addition, it is possible to achieve the function and effect of the first characteristic configuration of the grate piece while forming the dust placement surface formed on the upper surface of the side-by-side grate pieces at a uniform height in the width direction. .

[Characteristics of the structure of the grate] The first characteristic of the structure of the grate according to the present invention for the above-mentioned purpose is, as described in claim 3, a stoker type grate in a garbage incinerator. The grate piece group is formed in a grate structure in which a grate piece group capable of forming a garbage placement surface and a plurality of grate piece groups are arranged adjacent to each other in the width direction of the grate piece. In addition, the width direction ends of the adjacent grate pieces are superimposed on each other in the front and back directions of the grate pieces, and while maintaining the superimposed state, the adjacent end portions in the width direction are adjacent to each other. The point is that they can be approached and separated from each other in the width direction.

[0011] A second feature of the grate structure according to the present invention for the above object is to form a grate piece group in the first structure of the grate structure as described in claim 4. Arranging the grate pieces according to the first feature configuration or the second feature configuration, and superimposing an overlapping portion of the adjacent grate piece from above the lower support portion of one adjacent grate piece, While forming the overlap part which allows mutual movement of the grate pieces in the width direction, the arrangement interval in the width direction of each of the grate pieces is regulated to a predetermined distance or more, so that the formation of the overlap part can be maintained. That is, there is provided an interval maintaining means.

[Function and effect of the grate structure] According to the first grate structure of the grate, similar to the first feature of the grate piece, heat is generated between the grate pieces. While preventing formation of a gap due to deformation, it is possible to prevent primary air from flowing through the furnace side wall due to distortion of the grate due to thermal distortion. In other words, the opposing end portions of the adjacent grate pieces are allowed to approach and separate from each other, so that the influence of the thermal deformation of the grate pieces is not exerted on the adjacent grate pieces. The grate piece group can be prevented from being deformed into a fan shape. In addition, since the opposing ends of the adjacent grate pieces are overlapped in the front and back directions, even when the opposing ends move relative to each other, it is possible to prevent the primary air from flowing through between the two grate pieces. Also, since each grate piece does not affect its thermal deformation on adjacent grate pieces, the thermal deformation at both ends of the grate piece group is only the thermal deformation of one grate piece, so Even at both ends of the one group, there is no gap enough to cause blow-through. As a result, similarly to the first characteristic configuration of the grate piece, the combustion state of the furnace can be prevented from becoming abnormal due to the bias of the primary air, and the stable combustion of the furnace can be maintained.

According to the second feature configuration of the grate structure, while the operation and effect of the first feature configuration of the grate structure are exhibited, the arrangement intervals of the grate pieces constituting the grate piece group are set at intervals. Since it has been regulated to a predetermined distance or more by the maintaining means, the interval between the grate pieces located at both ends of the grate piece group is maintained at a predetermined distance, therefore, the thermal deformation of both ends of the grate piece group, Since the grate pieces at both ends are kept within the range of thermal deformation, it is possible to minimize or prevent the formation of a gap between the both ends and the furnace side wall.

[0014]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is an exploded perspective view of a grate piece and a grate structure according to an embodiment of the present invention. FIG. 1 is a side view of an essential part showing an example of a stoker mechanism for forming a grate according to the present invention.
Is a partially omitted longitudinal sectional view of the grate seen from the downstream side in the garbage transport direction, FIG. 3 is a perspective view of an example of the grate piece, and FIG. 4 is formed by continuously connecting the grate pieces. It is a principal part top view of the set grate piece group. Note that the same elements as those described in the related art and elements having the same functions are denoted by the same reference numerals as those in FIGS. 7 to 11, and a part of the detailed description is omitted. .

The grate according to the present invention is, as shown in FIG. 1, an example in which a grate piece 1 capable of forming a dust mounting surface on a stoker type grate in a garbage incinerator has a width of the grate piece 1. A plurality of grate piece groups 10 arranged adjacent to each other in the direction are formed. The grate piece group 10 is, for example, as shown in FIG. 2 showing a cross section viewed from the moving direction of the grate piece group 10 from the downstream side. The grate pieces 1 are overlapped with each other in the front and back directions to form an overlapped portion 11, and while maintaining the overlapped state of the overlapped portion 11, the adjacent end portions in the width direction are mutually connected in the width direction. Are formed so that they can be approached and separated freely. In other words, the overlapping portion 11 is provided between the adjacent grate pieces 1, from above the lower receiving portion 3 formed on one of the grate pieces 1, to the other side of the one adjacent grate piece 1 </ b> A. Are formed by superimposing the upper overlap portions 4 formed in the above. In order to maintain the overlapping state of the overlapping portions 11, the grate pieces 1 are provided with interval maintaining means 13 for regulating the arrangement interval in the width direction to a predetermined distance or more at each central portion. A pair of locking pieces 18 are formed as locking portions 18 for restricting the movement of the engaging portion 9 formed on the supporting portion 12 so as to be freely fitted to the supporting portion 12 in the longitudinal direction, that is, the width direction, with respect to the supporting portion 12.
a is provided on both sides of the engaging portion 9 of the support portion 12 to constitute the locking portion 18. This pair of locking pieces 18
By positioning the engaging portion 9 between the positions a, the grate piece 1 is restricted from moving left and right relative to the support portion 12. In the figure, the cross section of the grate piece group 10 located below the group of grate pieces 10 shown in cross section, that is, the cross section of the grate piece group located on the near side, and the grate piece group 10
The grate piece group located above, that is, located at the front is omitted.

As shown in FIG. 3, for example, in the above-described grate piece 1, a stepped portion 2a having a lower upper surface is formed at one end of the upper surface portion 2 in the width direction. A lower receiving portion 3 is formed such that opposing ends of a grate piece 1 disposed adjacent to the side can be overlapped from above, and the upper surface portion 2 is formed.
At the other end in the width direction, an upper overlap portion 4 is formed, which can be overlapped from above with the opposite end of the grate piece 1 arranged on the other end side in the width direction, as shown in FIG. As shown in FIG. 3, the upper end portion 4 of the adjacent grate piece 1A adjacent to one end side in the state of being continuously provided in the width direction is overlapped with the lower receiving portion 3 so that the end face in the width direction is The overlapping portion 11 which can be relatively moved in the width direction can be formed. Further, the upper overlapping portion 4 of the other end side of the upper surface portion 2 is overlapped with the lower receiving portion 3 of the adjacent grate piece 1A adjacent to the other end side, and similarly, the end face in the width direction is in the width direction. And an overlapping portion 11 which can be relatively moved is formed. The lower receiving part 3
Is formed at the stepped-down portion 2a of the upper surface portion 2 so as to have the same height as the lower surface on the other end side of the upper surface portion 2 of the adjacent grate piece 1A disposed on one end side. It is configured to receive the upper stacking portion 4 on the other end side, and it is possible to form a substantially flat dust mounting surface 21 in a state where the grate pieces 1 are connected to form a grate piece group 10. is there. The upper side surface of the stepped portion 2a that forms the lower receiving portion 3 is an inclined surface that recedes upward, and the opposing end surface of the upper overlap portion 4 also has
It is an inclined surface that recedes upward. When the grate piece 1 thermally expands during operation, these inclined surfaces allow dust on the step-down portion 2a to escape onto the upper surface portion 2,
This prevents dust from being caught between the upper side surface and the opposite end surface on the step-down portion 2a.

The grate pieces 1 are connected in series to form the grate piece group 10, and the locking pieces 18 a are provided on the support portion 12. The group 10 includes, as shown in FIG.
The upper overlap portion 4 of the adjacent grate piece 1A adjacent to the one end side overlaps with the lower receiving portion 3 at one end side of one grate piece 1, and the upper overlap portion 4 of the other end side , Overlapping on the lower receiving portion 3 of the adjacent grate piece 1A adjacent to the other end side, and contacting between the front and back while both sides are not in contact with each other between the ends of the upper surface portion 2 Thus, the gap between the adjacent grate pieces 1 is eliminated. As described above, in the case where the grate pieces 1 are thermally expanded and thermally expanded in the furnace, the grate pieces 1
In both cases, the grate piece group 10 adjacent to the rear end side provided with the engagement portion 9 is located on the upstream side in the transport direction, and primary air flows therebetween, so that the temperature does not rise as much as the front end 5. Although the point is the same as the conventional one, the structure is such that the opposed ends of the grate pieces 1 are not brought into contact with each other, and since the contact end 7 is not provided as in the conventional case, for example, as shown in FIG. Each grate piece 1
Is to be transformed into a fan shape in a plan view (in the figure, it is exaggerated), and the transformation causes the relative movement between the two opposing ends in the overlapping portion 11 to move between the lower receiving portion 3 and the upper portion. Absorbed by the relative displacement in the front width direction between the overlapping portion 4 and the relative distance between the adjacent grate pieces 1 hardly changes. As described above, since only the thermal strain of the grate pieces 1 at both ends of the grate piece group 10 needs to be dealt with, the pressing force of the elastic pressing means 19 for urging the pressing member 20 (see, for example, FIG. 2). Does not need to be strong, and its expansion and contraction width may be small. Therefore, since the acting force on the grate piece group 10 provided by the pressing member 20 is small,
A large strength is not required for the locking piece 18a provided on the support portion 12, and no large bending stress acts on the support portion 12.

As described above, since the grate piece group 10 does not deform into a fan shape, even if a gap is formed between the both ends of the grate piece 10 and the pressing member 20 provided with the side wall 22, the gap is not changed. Since the thermal expansion allowance in the width direction of one grate piece 1 is about half, there is only a slight gap, and it is possible to prevent the primary air from blowing at both ends of the grate. In the case of the shape of the grate piece 1 shown in the figure, the sliding surface portion of the grate piece group 10 on the downstream side in the transport direction with respect to the dust mounting surface 21 is provided only below the front end portion 5 and the lower receiving portion 3 on one end side. 6
The other end of the grate piece 1 is supported by the support 3 of the grate piece 1 adjacent to the other end, so that the movable grate piece group 10B moves forward. Front end 5
Even if a force for lifting each grate piece 1 is exerted when pushing out the dust to the downstream side, the weight of the dust on its own dust mounting surface 21 and the fixed grate adjacent to the upstream side Any grate pieces 1 are prevented from rising because they are pushed down by the weight due to the superposition of the pieces 10A.

Next, another embodiment of the present invention will be described. <1> In the above-described embodiment, as the interval maintaining means 13 for maintaining the overlapping state of the overlapping portions 11, the engaging portions formed at the respective central portions and formed to be able to be externally fitted to the supporting portions 12. The example in which the pair of locking pieces 18a for restricting the movement of the portion 9 with respect to the support portion 12 in the width direction are provided on both sides of the engaging portion 9 has been described.
Instead of 8a, as shown in FIG. 5, for example, a spacing member 13 which is formed by dividing a tubular member in a circumferential direction and cutting it into a predetermined length.
A is placed on the support portion 12, and among the engagement portions 9, the engagement portion 9 located at the central portion is formed so as to be directly fittable onto the support portion 12, and the other engagement portions 9 are The spacing member 1
3A may be formed so as to be freely fitted to the outside. With such a configuration, the ends of the spacing members 13A come into contact with the engaging portions 9 located at the central portion from the side, respectively, and the engaging portions 9 located at the central portion are provided. Is regulated by the spacing member 13A,
Prevent the adjacent grate pieces 1 from touching each other,
The same operation and effect as those of the above-described embodiment can be obtained.
The spacing member 13A is not limited to the above shape, but may be any member that engages with the engaging portion 9 of the adjacent grate piece 1 to suppress or prevent relative proximity between the two grate pieces 1. Any shape may be used. <2> In the above-described embodiment, as the spacing maintaining means 13 for maintaining the overlapping state of the overlapping portions 11, the engaging portions formed at the respective center portions and formed to be able to be externally fitted to the supporting portions 12. The example in which the locking portions 18 for restricting the movement of the portion 9 with respect to the support portion 12 in the width direction are provided on both sides of the engaging portion 9 provided at the central portion of the support portion 12 has been described. The locking portion 18 may be provided for the engaging portion 9 at another position, or may be provided so as to lock to the engaging portion 9 at the same position. Regarding this point, the same applies to the locking portion 18 for contacting the spacing member 13A of <1>. <3> In the above-described embodiment, the lower receiving portion 3 is formed at one end in the width direction of the upper surface portion 2 with a stepped portion 2a having a lower upper surface, so that the lower receiving portion 3 is adjacent to the lower end. Grate piece 1A
The upper surface 2 has the same height as the lower surface on the other end side thereof, and is configured to receive the upper overlapping portion 4 on the other end side of the adjacent grate piece 1A. The example in which the substantially flat dust mounting surface 21 can be formed in a state where the grate piece group 10 is formed has been described. However, if the dust mounting surface 21 does not need to be formed flat, the above configuration may be replaced. A step portion for raising the upper surface is formed in the upper overlapping portion 4, and the lower surface is adjusted to the height of the upper surface of the lower receiving portion 3 of the adjacent grate piece 1;
Without forming a step-down portion in the lower receiving portion 3, and
The grate piece 1 may be formed so as not to contact between the side end of the lower receiving portion 3 and the step of the upper overlapping portion 4. With this configuration, the dust mounting surface 21 in which the portion of the overlapping portion 11 is high is formed. Also, as shown in FIG.
One grate piece 1 is made higher than the height of the adjacent grate piece 1A, which is an adjacent grate piece, and the lower surface of both sides of the grate piece 1 is placed on the upper surface of the adjacent grate piece 1A on both sides. 2, the widthwise both ends of the upper surface 2 of the grate piece 1 are formed in the upper overlap portion 4, and the widthwise both ends of the upper surface 2 of the adjacent grate piece 1A are formed. It may be configured to be formed in the lower receiving portion 3. <4> In the drawings used in the description of the above embodiment,
Although an example in which five ribs 8 are formed on the grate piece 1 and the engaging portions 9 are formed on the ribs 8 at both ends in the width direction and the rib 8 at the center, the number of the ribs 8 is arbitrary. Therefore, the number may be four or less, or six or more. Further, the engaging portions 9 may not be provided intermittently on the ribs 8, but may be provided with any one of the ribs 8, and may be provided on all the ribs 8. May be provided with the engaging portion 9. <5> In the drawings used in the description of the above embodiment,
Although an example in which the ventilation holes 8a are formed in the ribs 8 is shown, the ventilation holes 8a can be omitted, some of them may be omitted, or all the ventilation holes 8a may be omitted.

In the claims, reference numerals are provided for convenience of comparison with the drawings, but the present invention is not limited to the configuration shown in the attached drawings.

[Brief description of the drawings]

FIG. 1 is a side view of an essential part showing an example of a stoker mechanism according to the present invention.

FIG. 2 is a sectional view of a main part of a grate piece group in the grate shown in FIG.

FIG. 3 is a perspective view showing an example of a grate piece shown in FIG. 2;

FIG. 4 is a plan view of a main part of the grate piece group shown in FIG. 2;

FIG. 5 is a plan view for explaining the operation of an example of the present invention.

FIG. 6 is a front view of a main part showing another example of a grate piece according to the present invention.

FIG. 7 is a perspective view of a main part showing an example of a conventional stoker mechanism.

FIG. 8 is a plan view showing an example of a conventional grate piece.

FIG. 9 is a longitudinal cross-sectional view showing an example of a conventional grate piece.

FIG. 10 is a longitudinal sectional view of a main part of a conventional stoker mechanism as viewed from the front.

FIG. 11 is a plan view of an essential part for explaining a problem of a conventional grate.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Grate piece 1A Adjacent grate piece 2 Upper surface part 2a Step-down part 3 Lower receiving part 4 Upper overlapping part 9 Engagement part 10 Grate piece group 11 Overlapping part 12 Supporting part 13 Spacing member

Claims (4)

[Claims] An engaging portion (9) extending downward from said upper surface portion (2), comprising an upper surface portion (2) capable of forming a dust mounting surface on a stoker type grate in a garbage incinerator. A plurality of grate pieces arranged adjacent to each other in the width direction by engaging a support portion (12) provided along the width direction with one end of the upper surface portion (2) in the width direction. A lower receiving portion (3) is formed on the upper portion so that opposing ends of the adjacent grate pieces (1A) arranged adjacent to one end side in the width direction can be overlapped from above, and the upper surface portion (2) is formed. ), The other end portion in the width direction has an upper overlap portion (4) which can be overlapped from above with the opposite end portion of the adjacent grate piece (1A) arranged on the other end side in the width direction. The upper stacking part (4), which is adjacent in the state of being continuously provided in the width direction, is connected to the other lower receiving part (3), which is adjacent. By combining it, the width direction of the end face is relatively movable overlap portion in the width direction (11)
A grate piece that can be formed into a grate. 2. A lower receiving portion (3) is formed by forming a stepped portion (2a) having a lower upper surface at one end of the upper surface portion (2) in the width direction to form a continuous lower receiving portion. 2. The grate piece according to claim 1, wherein a substantially flat dust mounting surface can be formed by the method. 3. A grate piece in which a plurality of grate pieces (1) capable of forming a dust mounting surface on a stoker type grate in a garbage incinerator are arranged adjacent to each other in the width direction of the grate piece (1). Group (1
0), wherein when forming the grate piece group (10), the widthwise ends of the adjacent grate pieces (1) are connected to the grate piece (1). A) a fire grate structure in which the adjacent end portions in the width direction are allowed to approach and separate from each other in the width direction while maintaining the superimposed state. 4. The grate piece group (10) comprises:
The grate piece according to claim 1 or 2, wherein the grate piece is disposed on the lower support part (3) of the adjacent one grate piece (1) and the upper part of the adjacent grate piece (1) is overlapped. 4) are overlapped to form an overlapping portion (11) that allows the grate pieces (1) to move in the width direction with each other, and that the grate pieces (1) are arranged at intervals in the width direction. The grate structure according to claim 3, further comprising a gap maintaining means (13) for restricting the distance to a predetermined distance or more and maintaining the formation of the overlapping portion (11).