JP2640218B2 - Small simple garbage incinerator - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a small and simple garbage incinerator for incinerating combustible garbage such as newspapers and magazines, plastics, wood chips, dead grass, dead trees and the like from homes and relatively small organizations. It relates to a furnace.

[0002]

2. Description of the Related Art A conventional household refuse incinerator has a concrete wall surface or a wall surface formed by stacking bricks or concrete blocks, and a chimney or a lid on a ceiling made of the above-mentioned material. There is an input section,
It is generally known that a furnace having a grate is provided in a furnace having an ash outlet at a predetermined position on a wall surface.

[0003] For example, JP-A-1-217113 discloses that "a heat-resistant furnace material is stuck inside a box-shaped main body having an openable and closable lid, and a fixed fire fixed to the bottom of the furnace material. A movable grate provided in close proximity to a grate and a lower part thereof, a heater cover provided at the center of the fixed grate so as to protrude into the furnace material, and an air supply pipe for sending combustion air into the furnace material, Protrude into the heater cover and fix it,
A household waste disposal device for incinerating garbage such as kitchen garbage, comprising a heater for incinerating garbage, an ash tray provided below the fixed grate, and an exhaust port for exhausting gas generated in the main body. Is described.

Japanese Unexamined Patent Publication (Kokai) No. 4-3440013 discloses that "4 is formed with concave sliding surfaces 4A and 4B in the form of arcs on which a movable grate described later slides in each of a lower half and an upper half. The lower fixed grate 4 is formed in a chevron shape and is spaced apart along the flow direction of the refuse charged into the incinerator. Therefore, the cooling effect by the air from below the lower fixed grate 4 is high. "," The movable grate 6 is formed with a plurality of air holes 7 communicating with the bottom surface 6A. " From the lower part of the grate 4 through the air holes 7, the flow rate of the combustion air for burning the refuse on the movable grate 6 is increased, and the combustion efficiency of the refuse is increased. ” The refuse is sufficiently stirred while the fuel from the air holes 7 formed in the movable grate 6 is removed. Burned by the air, become ash is discharged from the discharge port of the incinerator. "It has been described.

[0005]

The above-mentioned conventional household incinerator has a wall or the like made of cast-in-place concrete or brick or concrete block. Since it is not mass-produced in a factory, the production cost is high.

As an example of a household garbage incinerator produced in a factory, there is one described in the above-mentioned Japanese Patent Application Laid-Open No. Hei 1-217113. A fixed grate fixed to the bottom, a movable grate, a heater cover, an air supply pipe that sends combustion air inside the furnace material, a heater that incinerates refuse, and a heater A household waste disposal device that incinerates garbage such as kitchen garbage with an exhaust port that exhausts the generated gas, and has a complicated structure that incinerates garbage such as kitchen garbage containing water, thus reducing manufacturing costs. It is expensive and heavy, and the cost of transportation to the installation location is high.

[0007] Japanese Unexamined Patent Publication No. Hei 4-34413 discloses a movable grate having a movable grate and a lower fixed grate, which is formed on a movable grate while sufficiently stirring the dust on the movable grate. This is a large-scale garbage incinerator that burns with the combustion air from the vents.

The present invention provides a lightweight, rigid and durable structure which can be mass-produced in a factory, has a simple structure, and has a low manufacturing cost.
Moreover, it has good combustion efficiency, and is highly suitable for household or small organization papers, such as newspapers and magazines, plastics,
It is an object of the present invention to provide a small and simple garbage incinerator for incinerating combustible garbage such as wood chips, dead grass and dead trees.

[0009]

SUMMARY OF THE INVENTION A small and simple refuse incinerator according to the present invention has a box-shaped furnace body made of a thin iron plate and a garbage charging hopper. An inner plate is attached to the inner surface of each of the outer plates constituting the upper plate portion, the left and right side wall portions, and the rear wall portion which are inclined forward and downward from the chimney portion provided at the upper rear side, so as to have an insulating space. The grate is provided in the lower part of the garbage burning section so as to be freely inserted and removed, and the grate is large and small in height different from each other in the front-back direction of the box-shaped furnace body. It has a cross section mountain shape,
The top is configured such that acute angled chevron members are parallel and there is a space between the chevron members, and the large chevron member is provided with a combustion air circulation part and an air outflow part communicating therewith. The dust input hopper is provided with a dust input opening provided in front of the downwardly inclined front upper plate, an openable and closable lid, and a fixed partition provided below the rear of the dust input opening. A plate, a movable partition plate swingably provided at a lower end of the fixed partition plate, and an inclined plate provided so as to be located near a lower end portion of the movable partition plate from the front of the dust input opening. , Left and right outer plates, and a removable ash receiving member is provided at the lower part of the grate. Air inlet holes are provided.

[0010] A small and simple refuse incinerator according to the present invention has a substantially cylindrical furnace body made of a thin iron plate and a garbage charging hopper section, and the garbage burning section of the furnace body is provided at an upper rear portion of the furnace body. It is composed of an upper plate and a side plate that constitutes a side wall that is inclined forward and downward from the chimney part that surrounds the outer plate of the furnace body on the outer periphery of the refuse combustion unit excluding the refuse hopper unit. And a protective member is attached to the outer plate so as to have a space portion, and a grate is provided at a lower portion of the refuse combustion portion so as to be freely inserted and removed, and the grate is a box-shaped furnace body. In the front-rear direction, the height is alternately large and small in cross section, and the top is configured such that acute-angled chevron members are parallel to each other and a space is formed between the chevron members. The mountain-shaped member is provided with a combustion air circulation section and an air outflow section communicating therewith. A hopper portion, a dust input opening provided in front of the inclined front upper plate portion, a lid that can be opened and closed, and a fixed partition plate provided below a rear portion of the dust input opening; A movable partition plate swingably provided at the lower end of the fixed partition plate, an inclined plate provided so as to be located near a lower end portion of the movable partition plate from the front of the dust input opening, and a left and right outer plate. A ash receiving member is provided at the lower part of the grate, and the ash receiving member is inclined forward and downward.A plurality of combustion air introduction holes are provided on an outer plate constituting a side wall of the furnace body below the grate. Is provided.

[0011]

The operation of the small simple garbage incinerator according to the present invention will be described. Each member constituting the small simple garbage incinerator according to the present invention, including a grate, an ash receiving member, a chimney, etc., is made of a thin iron plate. Therefore, an antiseptic plating layer is formed by a simple process of immersing in a bath of molten zinc immersion plating, and it is lightweight and durable enough to withstand the burning temperature of garbage such as paper and plastic. Is what you have.

The box-shaped furnace body can increase the amount of refuse to be burned than the circular furnace body, and has a double structure having an inner plate inside an outer plate having a heat insulating space using a thin iron plate. Because of the furnace body, even if high thermal stress acts,
Even if any external force is applied, it is not easily distorted, and since the heat insulating space is provided on the outer periphery of the refuse burning portion, it is safe against high heat.

The acute angle peaks of the large angle members having different heights of the grate and the acute angle peaks of the small angle members are provided alternately in parallel and with a space, so that they can be put in layers. Garbage such as waste paper does not clog tightly and overlaps the grate with voids and gaps, so the flow of combustion air is good, so that combustion can be done quickly, efficiently and surely naturally. .

The grate has alternately parallel large and small chevron members having an acute angle at the top, and the large chevron member has an air circulation portion and an air outflow hole or an air outflow opening. Since the combustion air introduction hole is provided in the outer plate constituting the lower wall surface, cut and dried grass, dead tree, dead grass, etc. can be almost completely burned, so that there is little smoke emission and thus air pollution. It is useful for environmental protection without causing it, and is suitable for, for example, incineration of fallen leaves and dead grass in farms and ordinary households.

Further, the grate has large and small mountain-shaped members alternately and parallelly formed with an acute angle at the top, and the large mountain-shaped member is provided with an air circulation portion and an air outflow hole or an air outflow opening. In addition, since ash is easy to fall and air circulation is good, even layered paper trash such as newspapers, magazines, and books, which are generally considered to be difficult to burn, can be burnt quickly and efficiently.

Since a fixed partition plate and a movable partition plate are provided at the boundary between the dust input hopper portion and the dust burning portion, newly burning debris is opened and the dust is put into the dust input hopper portion during incineration of the debris. When the garbage is pushed in, the movable partition plate opens and the garbage falls into the garbage burning section and burns, but when the garbage falls into the burning section, the movable partition plate closes and the flame of the garbage burning section blows out through the garbage input hopper section. Since there is no waste, it is safe when dust is put into the dust hopper 8.

A furnace body having a large diameter has a problem that the plate thickness must be increased because the furnace body is easily distorted by its own weight, which causes a problem that the weight of the furnace body increases. Since the body is formed in a circular shape by stepping, it has a reinforcing effect on distortion even though it is a thin iron plate.

[0018]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 shows an embodiment of a small simple waste incinerator according to the present invention. FIG. 1 is a side sectional view of one embodiment of a small simple waste incinerator, and FIG. 3, FIG. 3 is a plan view of the one shown in FIG. 1, FIG. 4 is a plan view of a grate suitable for a small simple incinerator, and FIG. 5 is a cross-sectional view taken along line AA of FIG. FIG. 6 is a plan view showing another embodiment of a grate suitable for a small simple garbage incinerator, and FIG.
8 is a side view of the inclined portion of the large angled member shown in FIG. 4, FIG. 9 is a side view of the inclined portion of the large angled member shown in FIG. 6, and FIG. 10 is a large angled member. FIG. 11 is a side sectional view of another embodiment of the small simple garbage incinerator, FIG. 12 is a partially cutaway front view of the one shown in FIG. 11, and FIG. It is a top view of what is shown in FIG.

The box-shaped furnace 1 and the dust hopper 8 shown in FIGS. 1, 2 and 3 are made of a thin iron plate having a galvanized layer. The inner plate 3 is attached to the inner portion of the plate 2 by welding so as to form the heat insulating space 4 except for the dust input hopper portion 8 and the chimney 5. , Inner plate 3
And has a double structure.

A dust input opening 7 is provided in an upper plate portion 6 which is inclined forward and downward from the chimney 5. A cover 9 which can be opened and closed by a hinge 31 or the like is provided in the dust input opening 7. A fixed partition plate 11 having a width substantially equal to the width of the opening 7 and having a desired length is fixed below the rear portion of the dust input opening 7 so that the lower end thereof is located slightly forward. A movable partition plate 12 is provided at the lower end of the partition plate 11 by a hinge 13 in a swingable and hanging state, and the inclined plate 32 is positioned near the lower end of the movable partition plate 12 from the front of the dust input opening 7. The dust input hopper section 8 includes a dust input opening 7, a fixed partition plate 11, a movable partition plate 12, and left and right outer plates 2 of the box-shaped furnace body 1. Incidentally, reference numeral 20 denotes the movable partition plate 12.
And 28, an opening / closing handle for opening and closing the lid.

The grate 14 is provided on the left and right grate support members 25, 25 so that the grate 14 can be inserted and removed by the handle 29 at the lower portion of the dust input hopper portion 8 of the furnace body 1.

The grate 14 is composed of a large mountain-shaped member 15 and a small mountain-shaped member 16 having large and small mountain cross-sections having different heights alternately arranged in the front-rear direction of the furnace body 1. The grate 14 is welded and attached between the rear frame member 21 and the front frame member 22 of the grate 14 so as to form a space 24 between the shape members 15 and 16. Grate 1
4 further has left and right frame members 23 on its left and right.

The concrete structure of the grate 14 will be described with reference to FIGS. 4 to 10. The first embodiment of the grate 14 shown in FIGS. The large and small mountain-shaped members 15 and 16 are formed in parallel with each other in the front-rear direction. The grate 14 is welded and attached between the rear frame member 21 and the front frame member 22 so as to form a space 24 between the members 15 and 16, and the left and right inclined portions 34 of the large chevron member are provided. , 34 are formed with a plurality of air outlet holes 18, 18 for letting combustion air flow out, in the triangular air circulation portion 17 and the left and right inclined portions 34, 34. It should be noted that a plurality of air outlet holes 1 for discharging the combustion air are provided.
8 and 18 may be provided on one inclined portion 34.

The fire grate 14 shown in FIGS. 6, 7, 9 and 10 has another embodiment in which the left and right inclined portions 34, 34 of the large chevron member 15 having a sharp end are formed. In the upper part, a plurality of air outlet openings 19 for discharging the combustion air,
19 are provided. The shape of the opening through which the combustion air flows out has a substantially circular shape as shown in FIGS.
Alternatively, it may be an elliptical shape.
It may be a triangular shape as shown in FIG. Further, the plurality of air outflow openings 19 may be provided in one of the inclined portions 34 as long as they communicate with the triangular air circulation portion 17 formed below the inclined portions 34, 34. Further, the large and small mountain-shaped members 15 and 16 of the grate 14 may be provided in parallel with the left and right direction of the furnace body 1.

A drawer-shaped box-shaped ash receiving member 26 is provided below the grate 14, and a plurality of outer plates 2 on the left and right sides of the furnace body 1 between the grate 14 and the ash receiving member 26 are provided. 27 holes are provided. Since the combustion temperature is not so high in the portion below the grate 14, the inner plate 3 is not attached to that portion.

Next, another embodiment of the small and simple garbage incinerator according to the present invention will be described with reference to FIGS. 11 to 13. Referring to FIG. 11 to FIG. A chimney 5 is provided at the upper rear of the cylindrical furnace body 35, and the chimney 5 is horizontally positioned at a predetermined position on the upper plate part 6 of the circular furnace body 35, which is inclined downward and forward from the chimney 5 portion. A dust input opening 36 is provided, and a dust input opening 7 is provided.
Is provided.

The opening 7 is provided downward from the rear portion of the dust input opening 7.
A fixed partition plate 11 having a width substantially equal to the width of the fixed partition plate 11 and having a desired length is fixed so that the lower end thereof is positioned slightly forward, and a movable partition plate 12 is swingable at the lower end of the fixed partition plate 11. Is provided so as to engage with the engaging portion 20 in a hanging state.

The inclined plate 32 of the dust input hopper 8 is provided so as to be located near the lower end of the movable partition plate 12 from the front of the dust input opening 7, and the dust input opening 7, the lid 9, The fixed partition plate 11, the movable partition plate 12, and the left and right outer plates 2, 2 constitute a dust input hopper section 8.

A grate 14 is provided at the lower part of the refuse combustion section 10 so as to be freely inserted and removed, and the grate 14 has a mountain-shaped cross section having a height different from that of the furnace body 1 alternately in the front-rear direction. The angle members 15 and 16 are configured so as to be parallel and a space 24 is formed between the angle members 15 and 16.
5 and 16 are provided with a plurality of air outflow holes 18 and air outflow openings 19 for outflow of combustion air, so as to surround the outer surface of the outer plate 2 constituting the furnace wall and between the outer plate 2 and the outer plate 2. Is provided with a protection member 37 made of a thin iron plate having a space portion.

The grate 14 is provided on the left and right grate support members 25, 25 so that the grate 14 can be inserted and removed by the handle 29 at a lower portion of the dust input hopper portion 8 of the furnace body 1.

The grate 14 is composed of a large mountain-shaped member 15 and a small mountain-shaped member 16 having large and small mountain cross-sections having different heights alternately arranged in the front-rear direction of the furnace body 1. The grate 14 is welded and attached between the rear frame member 21 and the front frame member 22 of the grate 14 so as to form a space 24 between the shape members 15 and 16. Grate 1
4 further has left and right frame members 23 on its left and right.

Since the structure of the grate 14 is substantially the same as that shown in FIGS. 4 to 10 described above, a description will be given here of a portion suitable for the circular furnace body 35. . The grate 14 is a straight left and right frame member 2
3, 23 and the rear frame member 21 which is the shape of the wall of the furnace body 35 are arc-shaped so as to conform to the shape of the arc-shaped wall of the circular furnace body 35, and are formed on the arc-shaped wall of the circular furnace body 35. Both ends are supported by linear grate supporting rod members 41, 41 attached by welding or the like, and are provided so as to be freely inserted and removed.

The length of the large and small mountain-shaped members 15 and 16 attached to the rear frame member 21 by welding is also set to the length according to the arc. The rear frame member 21 of the grate 14 has an arc shape so as to conform to the shape of the arc-shaped wall surface of the circular furnace body 35, and therefore, the rear frame member 21
Large and small chevron-shaped members 1 attached by welding
The lengths of 5 and 16 are also in accordance with the arc.

The grate 14 further has left and right frame members 23 on the left and right sides thereof.
The left and right dust receiving rods 43 are provided to prevent dust burned from a space formed between the wall surface of the left and right frame members 23 and the right and left frame members 23 and 23 from directly falling onto the ash receiving member 39 provided at an angle. Is provided on the wall surface of the furnace body 1. 4
Reference numeral 2 denotes a rear dust receiving rod-shaped member when the rear frame member 21 of the grate 14 is made linear. In addition, 40 is an ash extraction opening.

The circular furnace body 35 is not provided with the inner plate 3 so as to have an adiabatic space on the inner surface of the outer plate 2 of the refuse burning portion 10, so that the furnace body 35 is inadvertently touched during refuse combustion. In order to prevent a danger such as a burn due to a danger, a danger protection member 37 composed of a plate-shaped body 37 is provided on the outer surface of the furnace body 35 through a stud bolt 38 which is attached to the outer surface of the furnace body 35 by a certain gap. It is attached so as to surround the dust burning part 10 other than the part of the dust input hopper part 8.

The operation of the embodiment of the small simple garbage incinerator according to the present invention will be described. Each member constituting the small simple garbage incinerator according to the present invention, including the grate 14, the ash receiving member 26, the chimney 5, etc. Is made of a thin iron plate, so that an antiseptic plating layer is formed by a simple process of immersing it in a bath of molten zinc immersion plating, and it can withstand the burning temperature of dust such as paper and plastic. It is lightweight and durable.

The box-shaped furnace body 1 can burn more garbage than the circular furnace body 35, and the inner plate 3 is placed inside the outer plate 2 having the heat insulating space 4 using a thin iron plate. Since the furnace body 1 has a double structure, it is not easily distorted even if a high thermal stress is applied or any external force is applied. , So it is safe against high heat.

The acute angle tops 33 of the large chevron members 15 having different heights of the grate 14 and the acute angle tops 33 of the small chevron members 16 are provided alternately in parallel with a space 24. Therefore, dusts such as paper put in a layer form do not clog up tightly, and overlap with the grate 14 with voids and gaps, so that the flow of combustion air is good, so that combustion is quick, efficient and reliable. Can be naturally burned.

The grate 14 has large and small mountain-shaped members 15 and 16 alternately parallel to each other with an apex 33 at an acute angle. The large mountain-shaped member 15 has an air flow portion 17 and an air outflow hole 18 or an air outflow opening. Since the combustion air introduction holes 27 are provided in the outer plate 2 constituting the wall surface below the grate 14, the cut and dried grass, dead tree, dead grass and the like can be almost completely burned. Therefore, it emits less smoke and is therefore environmentally beneficial without causing air pollution, and is suitable for, for example, incineration of fallen leaves and dead grass in farms and ordinary households.

The grate 14 has large and small mountain-shaped members 15 and 16 alternately parallel to each other, and the top 33 has an acute angle. Since the outflow opening 19 is provided, the ash is easy to fall, and the air circulation is good, so that even layered paper garbage such as newspapers, magazines, and books, which are generally considered to be difficult to burn, can be quickly and efficiently used. Can be burned.

Since the fixed partition plate 11 and the movable partition plate 12 are provided at the boundary between the trash input hopper section 8 and the refuse burning section 10, the newly burning trash can be opened by opening the lid 9 and the trash input hopper during incineration of the trash. When the dust is put into the portion 8 and the dust is pushed in, the movable partition plate 12 is opened and the dust falls into the dust burning portion 10 and burns. However, when the dust falls into the burning portion 10, the movable partition plate 12 closes and the dust burning portion is closed. Since the flame 10 does not blow out through the dust input hopper section 8, it is safe when dust is put into the dust input hopper section 8.

The furnace body having a large diameter has a problem that the plate thickness must be increased because the furnace body is easily distorted by its own weight, and the weight of the furnace body is increased. Since the body 35 has a circular shape by stepping,
Although it is a thin iron plate, it has a reinforcing effect on distortion.

[0043]

The compact and simple incinerator according to the present invention is a light weight, rigid and durable structure that can be mass-produced in a factory, has a simple structure, is inexpensive to manufacture, has good combustion efficiency, and has high safety. It has the effect of incinerating combustible garbage such as newspapers, magazines and other papers, plastics, wood chips, dead grass, dead wood, etc., suitable for use or for small tissues.

The small and simple garbage incinerator according to the present invention has a low transportation cost to the installation place, can be installed quickly and easily, and is safe even if a child or the like approaches carelessly. It has the effect of being suitable for homes or small organizations.

[Brief description of the drawings]

The figure shows an embodiment of the small simple garbage incinerator according to the present invention.

FIG. 1 is a side sectional view of one embodiment of a small simple garbage incinerator.

FIG. 2 is a front view showing a part of FIG.

FIG. 3 is a plan view of what is shown in FIG.

FIG. 4 is a plan view of a grate suitable for a small simple incinerator.

FIG. 5 is a sectional view taken along line AA of FIG. 4;

FIG. 6 is a plan view showing another example of a grate suitable for a small simple garbage incinerator.

FIG. 7 is a sectional view taken along line BB of FIG. 6;

FIG. 8 is a side view of an inclined portion of the large chevron member shown in FIG.

FIG. 9 is a side view of an inclined portion of the large chevron member shown in FIG.

FIG. 10 is a side view of another embodiment of the inclined portion of the large chevron member.

FIG. 11 is a side sectional view of another embodiment of the small simple garbage incinerator.

FIG. 12 is a front view in which a part of the one shown in FIG. 11 is broken.

FIG. 13 is a plan view of what is shown in FIG.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Box-shaped furnace body 2 Outer plate 3 Inner plate 4 Insulated space 5 Chimney 6 Upper plate 7 Dust input opening 8 Dust input hopper 9 Lid 10 Dust burner 11 Fixed partition plate 12 Movable partition plate 14 Fire grate 15 Large Chevron member 16 small chevron member 17 air circulation part 18 air outlet hole 19 air outflow opening 26 ash receiving member 32 inclined plate 33 acute angle top 35 circular furnace body 36 horizontal dust input opening 37 protection member 39 inclined ash receiving member

Claims (2)

(57) [Claims] 1. A furnace body having a box-like shape made of a thin iron plate and a garbage charging hopper, wherein a garbage burning portion of the furnace body is inclined forward and downward from a chimney provided at an upper rear portion of the furnace body. It has a double structure with an inner plate attached to the inner surface of each outer plate constituting the upper plate portion, the left and right side wall portions, and the rear wall portion so as to have a heat insulating space on the inner surface, and a lower portion of the garbage combustion portion A grate is provided so as to be freely inserted and removed, and the grate has a large and small cross-sectional mountain shape whose height is alternately different in the front-rear direction of the box-shaped furnace body,
The top is configured such that acute angled chevron members are parallel and there is a space between the chevron members, and the large chevron member is provided with a combustion air circulation part and an air outflow part communicating therewith. The dust input hopper is provided with a dust input opening provided in front of the downwardly inclined front upper plate, an openable and closable lid, and a fixed partition provided below the rear of the dust input opening. A plate, a movable partition plate swingably provided at a lower end of the fixed partition plate, and an inclined plate provided so as to be located near a lower end portion of the movable partition plate from the front of the dust input opening. , Left and right outer plates, and a removable ash receiving member is provided at the lower part of the grate. Small and simple, characterized by having air inlet holes Mi incinerator. 2. A furnace having a substantially cylindrical furnace body made of a stepped thin iron plate and a garbage charging hopper section, wherein a garbage burning section of a furnace body is provided with a chimney provided at an upper rear portion of the furnace body. The upper portion is inclined downward and forward from the portion, and is constituted by an outer plate constituting a side wall portion, and the outer periphery of the refuse burning portion excluding the refuse hopper portion surrounds and surrounds the outer plate of the furnace body. A protection member is attached with a space between the plate and a plate, and a grate is provided at the lower part of the refuse combustion section so as to be freely inserted and removed, and the grate is provided in the front-rear direction of the box-shaped furnace body. The heights of the cross-sections are alternately large and small, and the tops of the cross-sections are configured such that acute-angled mountain-shaped members are parallel to each other and the space between the mountain-shaped members is a space. Is provided with a flow section for combustion air and an air outflow section communicating therewith. A dust input opening provided in front of the front lower inclined upper plate portion, a lid capable of opening and closing the opening, a fixed partition plate provided below a rear portion of the dust input opening, and a fixed partition plate. A movable partition plate swingably provided at a lower end, an inclined plate provided so as to be located near a lower end portion of the movable partition plate from a front portion of the dust input opening, and left and right outer plates. The lower part of the grate is provided with an ash receiving member inclined forward and downward, and a plurality of combustion air introduction holes are provided on an outer plate constituting a side wall of the furnace body below the grate. Small incinerator.