JPH04320713A - Grate bar of refuse incinerator - Google Patents

Abstract

PURPOSE:To prevent the freedom of cut by the edge of a fixed grate bar that is mounted on the upper face section of a movable grate bar and, at the same time, provide a favorable flow pattern for conversion action in the refuse transportation without creating gaps between the fixed grate bar and movable grate bar when the movable grate bar moves. CONSTITUTION:A first curved surface section is formed on a movable grate bar 21 and a second curved surface section on a fixed grate bar 22, and the amount of the first displacement at the first curved surface section of the movable grate bar 21 and the amount of the second displacement at the second curved surface section are set so that the sum of the amounts of the first displacement and the second displacement at specified positions is equal to a standard amount of displacement.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to improvements in grate systems such as drying stokers, combustion stokers and afterburning stokers for waste incinerators.

0002

2. Description of the Related Art Generally, combustible waste discharged from households is collected and disposed of by incineration in a waste incinerator. The waste incinerator is equipped with a drying stoker for transporting the waste while stirring and loosening it, a combustion stoker for transporting the waste while burning it, etc. In order to transfer waste efficiently, for example,
A grate device as shown in Japanese Patent No. 5623 is used.

FIGS. 10 to 12 show a grate device for a waste incinerator of this type. 10 and 11, reference numeral 1 denotes a support frame, and a plurality of support shafts 2 are provided on this support frame 1, arranged in the front-rear direction at predetermined intervals. On each support shaft 2, fixed grate bars 3 are arranged side by side in the horizontal direction, and a fixed grate bar row 4 made up of the fixed grate bars 3 arranged in the horizontal direction is constituted. The base end 3A of the fixed grate bar 3 is pivotally supported by the support shaft 2, and the fixed grate bar 3 in the front row is supported by the stopper 1A of the support frame 1, and is in an inclined state with its front side raised.

Reference numeral 5 denotes a movable great bar row consisting of a plurality of movable great bars 6 arranged in the horizontal direction, and each movable great bar row 5 is arranged alternately between each fixed great bar row 4. The movable grate bars 6 in each movable grate bar row 5 are pivotally supported by the rotary shaft 7 with grooves 6C formed at their base ends engaged with the rotary shaft 7.

As shown in FIG. 12, each of the above-mentioned fixed grade bars 3 has a cutting edge 3A formed on the lower side of the tip and a flat upper surface part 3B, and this cutting edge 3A is connected to each movable grade bar. It is placed on the planar upper surface portion 6B of No. 6. Further, the movable grade bar 6 described above has a cutting edge 6A formed on the lower side of the tip, and this cutting edge 6A is placed on the planar upper surface portion 3B of the fixed grade bar 3. Therefore,
Each fixed grate bar 3 and each movable grate bar 6 are in a diagonal state leaning against each other.

Furthermore, a bearing 8 is fixedly installed on the support frame 1, and a torsion rod 9 is provided on the bearing 8 along the lateral direction. A rod 11A of a hydraulic cylinder 11 is connected to an end of the torsion rod 9 via a first arm 10. The base end of the hydraulic cylinder 11 is fixedly attached to the support frame 1. A proximal end 12A of a second arm 12 is fixedly attached to the torsion rod 9, and the above-mentioned rotation shaft 7 is integrally attached to the distal end 12B via a joint member 13.

[0007] When the hydraulic cylinder 11 is actuated, the torsion rod 9 rotates alternately clockwise or counterclockwise with respect to its axial direction. The base end side of the bar 6 makes an arcuate motion in the reciprocating direction. At this time, as shown in FIG. 11, the large number of movable great bars 6 are divided into two groups A and B, and the movable great bars 6 of each group A and B are arranged alternately. When the movable grate bars 6 of group A are moving backward, the movable grate bars 6 of other group B, which are arranged along the longitudinal direction alternately with each movable grate bar 6 of group A, are moving forward. This is the second arm 12 related to group A and the second arm 12 related to group B.
This is accomplished by actuating the arms 12 in opposite phases with their respective hydraulic cylinders 12.

By the reciprocating operation of each movable grate bar 6, the garbage is stirred and loosened and sent forward, and in the process, it is dried and burned.

[0009]

However, in the conventional grate device for a garbage incinerator, each movable grate bar 6 moves along the upper surface portion 3B of the adjacent front fixed grate bar 3. . More specifically, the base end of the movable grate bar 6 moves in an arc, and its cutting edge 6A is placed on the upper surface portion 3B of the fixed grate bar 3 and slides on the upper surface portion 3B of the fixed grate bar 3.

[0010] As a result, the fixed grate bar 3 behind the movable grate bar 6 moves up and down in the direction perpendicular to its axial direction, but the grate device has the fixed grate bar 3 and the movable grate bar 6 arranged in several stages. Because of the structure, this vertical movement accumulates and causes the fixed great bar 3 located at the rear to
As the height increases, the vertical movement is amplified, and there is a possibility that it will have an adverse effect on the transportation of garbage and the like.

Furthermore, once the fixed grate bar 3 and the movable grate bar 6 have been moved upward, they do not immediately descend to the lower part of the grate due to inertia, etc., so that the cutting edge 3A of the fixed grate bar 3 and the upper surface portion 6B of the movable grate bar 6 During this period, a gap is created between the cutting edge 6A of the movable grate bar 6 and the upper surface 3B of the fixed grate bar 3, and dirt may fall down below the grate through these gaps, and combustion air from below the grate may flow into this gap. It will escape upward through. Therefore, the air that should be blowing uniformly between the dust layers blows through from a specific location, which prevents uniform processing when drying and burning the dust.

Furthermore, when the movable grate bar 6 is moved, the cutting edge 3A of the fixed grate bar 3 placed on the upper surface 6B of the movable grate bar 6 tends to bite, making it difficult for dust to slide down. However, there was a problem in that the flow pattern of the reversal action during garbage transportation deteriorated. The present invention has been made to solve the above-mentioned problems, and its purpose is to prevent the generation of gaps between the fixed and movable great bars when the movable great bars move, and to To provide a grate device for a garbage incinerator that can prevent the cutting edge of a fixed grate bar placed on the upper surface from digging into the grate and further improve the flow pattern of reversal action during garbage transportation. .

[0013]

[Means for Solving the Problems] The present invention includes a fixed great bar and a movable great bar that are arranged diagonally adjacent to each other alternately along the front-rear direction, and the fixed great bar has a base end thereof. The movable grating bar is configured to be rotatable by being pivotally supported on the support frame, and has a cutting edge formed on the lower side of the tip to be placed on the upper surface of the movable grate bar,
A movable grate for a waste incinerator, the movable grate having a proximal end that reciprocates in an arc, and a cutting edge that slides on the upper surface of the fixed grate bar on the lower side of the tip. In the device, when the lower cutting edge of the movable grating bar slides on the flat upper surface of the fixed grating bar, the lower cutting edge of the movable grating bar slides against a predetermined straight line along the upper surface of the fixed grating bar. Based on the reference displacement amount that goes up and down with
A second displacement amount opposite in the direction to the reference displacement amount is plotted on the upper surface of the fixed great bar to form the second curved surface portion, and a first displacement amount in the first curved surface portion is formed as a second curved surface portion.
The displacement amount and the second displacement amount in the second curved surface portion are characterized in that the sum of the first displacement amount and the second displacement amount at a predetermined position is equal to the reference displacement amount.

[0014]

[Operation] According to the present invention, in the movable grate bar,
The lower end side moves in an arc, and the cutting edge on the lower side of the tip slides on the second curved surface portion of the fixed grating bar in front of the movable grating bar and moves linearly in an oblique direction. At that time, the second displacement amount of the second curved surface portion is added to the locus of the movable great bar, and the fixed gray bar placed on the first curved surface portion of the movable great bar to which this second displacement amount has been added. The cutting edge is in a state where the first displacement amount in the first curved surface portion and the second displacement amount in the second curved surface portion are added to the movement of the movable great bar.

[0015] As a result, the lower end side of the movable great bar moves in an arc, but the cutting edge of the fixed great bar placed on the first curved surface of the movable great bar moves in a direction perpendicular to the moving direction of the movable great bar. vertical movement is extremely reduced.

[0016]

Embodiments Hereinafter, embodiments of the present invention will be explained with reference to the drawings. 1 to 9 show a grate device for a waste incinerator according to an embodiment of the present invention. In this embodiment, only the constituent parts that are different from the conventional example will be explained, and the same constituent parts as the conventional example are given the same reference numerals and the explanation thereof will be omitted.

In FIGS. 1 to 5, reference numeral 21 indicates movable grade bars, and reference numeral 22 indicates fixed grade bars. A plurality of such bars are arranged diagonally and adjacent to each other alternately along the front-rear direction. When viewed continuously from the side, Figure 1
The situation is the same as in 1. 2 and 3, a first curved surface portion 23 is formed on the upper surface of the movable great bar 21 and is displaced in a direction perpendicular to the axial direction thereof. Figure 4
, FIG. 5, a second curved surface portion 24 is formed on the upper surface of the fixed grate bar 22 and is displaced in a direction perpendicular to the axial direction thereof. Further, a recess 21C is formed in a cutting edge 21B below the tip of the movable grating bar 21, and a recess 22C is formed in a cutting edge 22B below the tip of the fixed grating bar 22. This reduces the amount of dirt being compressed by the blade edges 21B and 22B, and reduces the amount of dirt that is compressed by the blade edges 21B and 22B.
Even if garbage is drawn into C, it is easy to fall below the grate.

A first displacement amount 23A of the first curved surface portion 23 with respect to the reference line and a second displacement amount 24A of the second curved surface portion 24 with respect to the reference line are determined as follows based on FIG. In FIG. 6, a movable great bar 2 having a different shape from the movable great bar 21 shown in FIG.
A curved surface portion 25A is formed on the upper surface of the fixed grating bar 26, and the upper surface of the fixed grating bar 26 is made flat. The curved surface portion 25A of the movable grate bar 25 allows the cutting edge 25C at the lower tip of the movable grate bar 25 to move due to the arc movement of the rotating shaft 7 that is engaged with the groove portion 25B formed on the base end side. When the flat upper surface portion 26A of the front fixed grate bar 26 of the grate bar 25 is slid, the cutting edge 26C of the rear fixed grate bar 26 placed on the curved surface portion 25A of the movable grate bar 25 is movable. It is required that the great bar 25 does not move up or down in the direction perpendicular to the moving direction. Specifically, the reference displacement amount 26D that moves up and down with respect to a predetermined straight line L (corresponding to the reference line in FIGS. 2 and 4) along the upper surface portion 26A of the fixed great bar 26 in front of the movable great bar 25 is It is found along the axial direction.

Then, the reference displacement amount 26D of the movable great bar 25 at a predetermined position is determined by the reference displacement amount 26D of the movable great bar 21.
The first displacement amount 23A of the movable great bar 21 and the second displacement amount 24A of the fixed great bar 22 are shown in FIG. 6 by dotted lines. 2 corresponds to a displacement amount of 24A.

That is, the first displacement amount 23A, which is opposite in direction to the reference displacement amount 26D, is plotted on the upper surface of the movable great bar 21 to obtain the first curved surface portion 23, and at the same time, the reference displacement amount 26D and the direction is the opposite second displacement amount 24A
is obtained as the second curved surface portion 24 by plotting it on the upper surface of the fixed great bar 22, and the value of the first displacement amount 23A and the second
The values of the displacement amounts 24A are equal.

FIGS. 7 to 9 show a state in which the movable great bar 21 moves forward and changes in the order of FIG. 7→FIG. 8→FIG. 9. That is, the lower end side of the movable grate bar 21 moves in an arc, and the lower cutting edge 21B of the movable grate bar 21 slides on the second curved surface portion 24 of the fixed grate bar 22 in front of the movable grate bar 21 and moves in an oblique direction. move in a straight line.

[0022] Then, the cutting edge 21 of the movable grate bar 21
B is placed on the second curved surface portion 24 of the fixed great bar 22, so the movable great bar 21 moves so as to draw a locus intermediate between a circular arc and a straight line. The second displacement amount 24A of the curved surface portion 24 is added to the locus of the movable great bar 21. Further, the cutting edge 22B of the fixed grade bar 22 placed on the first curved surface portion 23 of the movable grade bar 21 to which the second displacement amount 24A has been added is A state is obtained in which the first displacement amount 23A in the curved surface portion 23 and the second displacement amount 24A in the second curved surface portion 24 are added.

As a result, the lower end side of the movable grate bar 21 moves in an arc, but the cutting edge 2 of the fixed grate bar 22 placed on the first curved surface portion 23 of the movable grate bar 21 moves in an arc.
2B represents the displacement of the first curved surface portion 23 of the movable great bar 21 passing through the first displacement amount 23A and the second displacement amount 24.
As the sum of arise.

According to the above configuration, when the movable great bar 21 moves, even if the movable great bar 21 moves in an arc, the movable great bar 21 moves linearly between the fixed great bars 22 on both sides thereof. Since the cutting edge 22B of the fixed great bar 22 placed on the first curved surface portion 23 of the movable great bar 21 can move up and down with respect to the direction perpendicular to the moving direction of the movable great bar 21, is extremely small, and there is no gap between the fixed grate bar 22 and the movable grate bar 21, which prevents garbage from falling below the grate and combustion air from below the grate from flowing upward through this gap. You can prevent it from slipping out. Therefore, air can be uniformly blown through the dust layers, and the dust can be uniformly processed during drying and combustion.

[0025] Furthermore, when moving the movable great bar 21,
This prevents the cutting edge 22B of the fixed grate bar 22 placed on the first curved surface portion 23 of the movable grate bar 21 from biting in, ensures that the fallen dust slides down, and improves the flow pattern of the reversal action during garbage transportation. It has the effect of being able to be maintained. Note that in this embodiment, the first displacement amount 23A
and the second displacement amount 24A are set to be equal to the reference displacement amount 26D, and the first displacement amount 23A and the second displacement amount 24A are set to be equal to the reference displacement amount 26D.
Although the value of A is equal to the value of The values of the second displacement amount 23A and the second displacement amount 24A do not necessarily have to be equal.

[0026]

[Effects of the Invention] As explained above, according to the present invention,
When the movable great bar moves, even if the movable great bar moves in an arc, the cutting edge of the fixed great bar placed on the first curved surface of the movable great bar will not move in the direction perpendicular to the moving direction of the movable great bar. On the other hand, there is very little vertical movement, and the effect is as if the movable great bar were configured to move in a manner similar to a linear movement.

In other words, since the movable great bar passes linearly between the fixed great bars on both sides, the cutting edge of the fixed great bar behind the movable great bar is extremely unlikely to move up and down. Therefore, there is no gap between the fixed grate bar and the movable grate bar, which prevents debris from falling below the grate and combustion air from below the grate from escaping upwards through this gap. can be prevented. Therefore, air can be uniformly blown through the dust layers, and the dust can be uniformly processed during drying and combustion.

[0028] Furthermore, when moving the movable grate bar, the cutting edge of the fixed grate bar placed on the top surface of the movable grate bar is prevented from digging into the movable grate bar. The effect is that the flow pattern of the action can be maintained well.

[Brief explanation of drawings]

FIG. 1 is a side view of a main part of a grate device for a garbage incinerator according to an embodiment of the present invention.

FIG. 2 is a side view of a movable grate bar in the grate device.

FIG. 3 is a plan view of a movable grate bar in the grate device.

FIG. 4 is a side view of a fixed grate bar in the grate device.

FIG. 5 is a plan view of a fixed grate bar in the grate device.

[Figure 6] The first movable grate bar in the same grate device
It is an explanatory view for calculating a displacement amount and a second displacement amount of a fixed great bar.

FIG. 7 is an explanatory diagram of the operating state of the grate device.

FIG. 8 is an explanatory diagram of the operating state of the grate device.

FIG. 9 is an explanatory diagram of the operating state of the grate device.

FIG. 10 is a plan view of a conventional grate device for a garbage incinerator.

FIG. 11 is a side view of the grate device.

FIG. 12 is a partial perspective view of the grate device.

[Explanation of symbols]

21 Movable great bar 21B Cutting edge 22 Fixed great bar 22B Cutting edge 23 First curved surface part 23A First displacement amount 24 Second curved surface part 24A Second displacement amount 26D Standard displacement amount

Claims (1)

[Claims] [Claim 1] A fixed grate bar and a movable grate bar are arranged diagonally adjacent to each other alternately along the front-rear direction, and the fixed grate bar has its proximal end pivotally supported on a support frame. The movable grate bar is configured to be freely rotatable, and has a cutting edge formed on the lower side of the distal end to be placed on the upper surface of the movable grate bar, and the movable grate bar has a proximal end thereof reciprocating in an arc. configured, and
In a grate device for a waste incinerator, which is equipped with a cutting edge formed on the lower side of the tip that slides on the upper surface of a fixed grate bar, the cutting edge on the lower tip of the movable grate bar is attached to the flat upper surface of the fixed grate bar. When sliding, the lower cutting edge of the movable grating bar moves up and down with respect to a predetermined straight line along the upper surface of the fixed grating bar. A displacement amount is plotted on the upper surface of the movable grade bar to form a first curved surface portion, and a second displacement amount having a direction opposite to this reference displacement amount is plotted on the upper surface of the fixed grade bar to form a second curved surface portion. , the first displacement amount at the first curved surface portion and the second displacement amount at the second curved surface portion are the first displacement amount at a predetermined position and the second displacement amount at a predetermined position.
A grate device for a garbage incinerator, characterized in that the sum of displacement amounts is set to be equal to a reference displacement amount.