JP2509865B2 - Grate wear reduction device for stairs stoker - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a grate wear reducing device for a stair stoker in a refuse incinerator, a combustion furnace or the like.

[0002]

2. Description of the Related Art In a conventional stairs stoker, a movable grate and a fixed grate have a structure that slides on each other. That is, as shown in FIG. 8, the conventional stairs stoker is a row reciprocating type in which the movable grate 10 and the fixed grate 12 are installed in a stepwise manner in the flow direction of the incineration material such as dust, and the movable grate 10 is used. Is attached to a movable frame 24 and the fixed grate 12 is attached to a fixed frame 26, and the grate is fitted side by side with the grate receiving shafts 16 and 18 extending in the furnace width direction. The air for incineration is supplied to the inside of the furnace through the ventilation holes provided at the boundary between the adjacent grate of the inclined part of the front surface of the grate, and the opening ratio of the stoker is made as small as possible to ensure the uniform supply of the ventilation air. It has a structure that can prevent the melt from dripping under the stoker.

The movable frame 24 is mounted on a fixed frame 26 on a rail 50, and the movable frame 24 is moved horizontally by a thrust force of a driving roller from a hydraulic cylinder via wheels 52.
It is configured to reciprocate upward and backward, so that the movable grate 10 also reciprocates with an upward stroke with respect to the horizontal. In the side wall portion that is in contact with the furnace wall, spring-adjusted side grate is attached to both sides of the grate row to seal the grate. In addition, an apron for sealing the movable grate 10 is provided in the stalker paragraph. 54 is a front seal.

As described above, the grate is arranged such that the movable grate 10 on the front seal 54 is arranged at the tip, the fixed grate 12 is arranged in the upstream direction, and then the movable grate 10 is arranged. The movable grate and the fixed grate are alternately arranged in order, and the apron portion at the upstream end is arranged with the movable grate 10 so that dust can be smoothly sent.

As shown in FIGS. 6 and 7, the movable grate 1
No. 0 is attached to one set of movable frames 24, and all the movable grate 10 integrally move forward and backward diagonally upward with respect to the horizontal to push the dust 56 forward and move the dust 56 downward. From above, the movable grate 10 is moved forward and backward to invert, loosen, and stir the dust 56. In addition, in FIG. 7, a portion surrounded by a chain line circle is a sliding portion.

[0006]

As described above, in the conventional stairs stoker, the movable grate 10 and the fixed grate 12 are structured to slide on each other. The sliding part is subject to the grate's own weight and the dust's own weight, resulting in a large sliding resistance. Therefore, the sliding part has a structure in which wear progresses with operating time (reciprocating motion of the grate). . Especially the grate in the main fuel area of the stoker is exposed to high temperatures,
The abrasion resistance is lowered and the degree of abrasion is the largest among the stokers. As the wear of the grate progresses, the grate inclines forward and downward according to the amount of wear, and the sliding resistance further increases, which further accelerates the progress of wear.

That is, when the stairs stoker is new, as shown in FIG. 9, the upper surface of the movable grate 10 on the most upstream side,
Although it is parallel to the surface of the rail 50, when wear progresses on the front seal 54 while using the stairs stoker, as shown in FIG. 10, the movable grate 1 on the most upstream side is
The upper surface of 0 and the surface of the seal 50 are no longer parallel to each other and form an angle, the sliding resistance between the grate increases, and the wear progresses more and more. The grate at the upstream end becomes the most downward as the amount of wear inclines toward the front. In addition, S ₁ is wear of the front seal, S ₂
Indicates wear of the movable grate, and S ₃ indicates wear of the fixed grate.

Conventionally, as a countermeasure against the wear of the grate, an actual flat blade 3
As disclosed in Japanese Patent Publication No. 14547, a grate of an incinerator has been proposed in which a wear-prone portion can be separated, but it does not have a structure that reduces sliding resistance and wear amount.

The present invention has been made in view of the above points, and an object thereof is to support a grate with a spring material so that the weight of the grate does not act on the grate of an adjacent partner. Relaxes the sliding resistance of the grate sliding part (surface),
An object of the present invention is to provide a grate wear reducing device that reduces wear due to sliding.

[0010]

In order to achieve the above object, a grate wear reducing device for a stairs stoker according to the present invention is, as shown in FIG. 1, a movable grate 10 and a fixed grate 1.
In the stairs stoker in which the movable grate 10 slides and reciprocates on the fixed grate 12 by alternately arranging 2 and 2 in the flow direction of the material to be incinerated, at least one grate has its own
So that heavy does not act on the adjacent downstream grate
In addition, it is characterized in that it is pressed and supported from below by a spring member.

In the above apparatus, the spring member is the leaf spring 1.
4, the lower end of the leaf spring is fixed to the grate bearing shaft, the grate bearing bearing support member or the frame, and the upper end of the leaf spring 14 presses a portion near the tip of the grate from below.
It is preferably configured to support. Then, it is preferable that the reaction force of the spring material substantially balances with the weight of the grate.

Further, as shown in FIG. 3, the lower mounting hole of the leaf spring is a slotted notch 28 or a slot so that the leaf spring 14 can be adjusted upward and / or downward.
It is preferable that the adjusting member 30 is inserted below the lower end of the leaf spring adjusting mechanism. Further, as shown in FIG. 2, it is preferable that the bolt hole 34 of the plate spring pressing plate 32 for pressing and fixing the plate spring 14 with a bolt nut be a long hole.

[0013]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of the present invention will be described below in detail with reference to the drawings. However, the shape of the constituent members described in this embodiment, the relative arrangement, and the like, unless otherwise specified, are not intended to limit the scope of the present invention to only those, but merely illustrative examples. Nothing more. FIG. 1 shows a grate wear reducing device in this embodiment. Reference numeral 10 is a movable grate, and 12 is a fixed grate, which are alternately arranged in a flow direction of an incineration object (hereinafter, also referred to as garbage).

The movable grate 10 and the fixed grate 12 are pressed and supported from below by a spring member, for example, a leaf spring 14. Although FIG. 1 shows the case where a leaf spring is provided in each grate, one leaf spring may be provided in one of the plurality of grate. As shown in FIG. 5, the lower end of the leaf spring 14 that supports the movable grate 10 is fixed to the grate receiving shaft support member 20, and the upper end of the leaf spring 14 is closer to the tip than the center of the movable grate 10. Presses and supports the part. It is also possible to fix the leaf spring 14 to the grate receiving shaft 16 or the movable frame 24.

As shown in FIG. 4, the lower end of the plate spring 14 that supports the fixed grate 12 is fixed to the grate receiving shaft support member 22, and the upper end of the plate spring 14 is a tip from the center of the fixed grate 12. It presses and supports the part near it. The leaf spring 14 can be fixed to the grate receiving shaft 18 or the fixed frame 26. As described above, the leaf spring 14 is attached to the grate receiving shaft supporting member, the grate receiving shaft, the frame, or the like at a position that does not interfere with the reciprocating movement of the grate. It is preferable that the reaction force of the leaf spring 14 is approximately balanced with the weight of the grate.

Further, as shown in FIG. 3, the leaf spring 14 can be adjusted upward or / and downward.
The lower mounting hole of the is made a slotted notch 28 or a slotted hole, and the leaf spring 1
A leaf spring adjusting mechanism is configured by inserting an adjusting member 30 composed of a plurality of plate-like bodies (shims) or the like below the lower end of 4.
In addition, as shown in FIG. 2, the bolt spring 34 of the plate spring pressing plate 32 for pressing and fixing the plate spring 14 with the bolt 36 is made into a long hole so that the plate spring 14 can be easily slid up and down. 38 is a nut and 40 is a washer. When sliding the leaf spring 14 up and down, loosen the bolt 36, move the leaf spring 14, insert a proper number of shims, and then tighten the bolt 36 to fix the leaf spring 14 so that it does not lower. To do.

Next, the operation of this embodiment will be described. The weight of the grate is received by the leaf spring 14, and the sliding resistance of the grate due to the weight of the grate is reduced to reduce the wear of the sliding portion. The breakdown of the weight of the grate acting on the sliding surface and the weight of the dust is, for example, about 6 kg for the grate and 5-3 kg for the dust, so the sliding resistance due to the grate's own weight is small. This has a great effect on reducing wear.

The reaction force R of the leaf spring 14 is approximately balanced with the weight of the grate and assembled so that no gap is formed on the sliding surface E (see FIG. 1). The leaf spring 14 is adjusted up and down as described above. If possible, the reaction force of the leaf spring 14 can be adjusted. Then, after the leaf spring 14 is moved up and down for adjustment, the leaf spring pressing plate 32 and the leaf spring receiver such as a grate receiving shaft support member are provided so as not to move the leaf spring 14 up and down during use. The adjustment member 30 such as a shim is inserted and positioned. Even if a gap is formed on the sliding surface E due to aged wear (including burnout), the self weight of the dust overcomes the reaction force of the leaf spring 14 and lowers the grate downward, so this gap is automatically eliminated. If there is an extremely large gap, the leaf spring 14 is lowered and readjusted.

[0019]

As described above, the present invention has the following effects. (1) Since the grate is supported by the spring member, the total weight of the grate does not act on the adjacent downstream grate, the sliding resistance of the grate sliding surface is mitigated, and wear due to sliding Can be reduced. (2) If the reaction force of the spring member and the weight of the grate are approximately balanced, no gap can be formed on the sliding surface. (3) By making the lower mounting hole of the spring member an elongated hole notch or an elongated hole and making the bolt hole of the leaf spring holding plate an elongated hole,
The spring member can be easily adjusted. (4) In addition to the above (3), by inserting the adjusting member below the lower end of the spring member, it is possible to surely perform positioning during use, and the spring member moves up and down. Can be prevented.

[Brief description of drawings]

FIG. 1 is a side view showing an embodiment of a grate wear reducing device for a stairs stoker according to the present invention.

FIG. 2 is an enlarged cross-sectional explanatory view taken along the line AA in FIG.

3 is an enlarged cross-sectional explanatory view taken along the line BB in FIG.

FIG. 4 is an enlarged view seen from the direction of arrow D in FIG.

FIG. 5 is an enlarged view seen from the direction of arrow C in FIG.

FIG. 6 is an explanatory side view showing an operating state of a grate in a conventional stairs stoker.

FIG. 7 is an explanatory side view showing a dust feeding operation in the stairs stoker shown in FIG. 6;

FIG. 8 is a side view showing an example of a conventional stairs stoker.

9 is a side view showing a state where the stairs stoker shown in FIG. 8 is new and has not been worn.

10 is a side view showing a state where wear has progressed in the stairs stoker shown in FIG. 8. FIG.

[Explanation of symbols]

 10 Movable grate 12 Fixed grate 14 Leaf spring 16 Grate receiving shaft 18 Grate receiving shaft 20 Grate receiving shaft support member 22 Grate receiving shaft support member 24 Movable frame 26 Fixed frame 28 Long hole notch 30 Adjustment member 32 leaf spring retainer plate 34 bolt hole 50 rail

Claims (5)

(57) [Claims] 1. A movable grate (10) and a fixed grate (1)
In a stairs stoker in which the movable grate (10) slides and reciprocates on the fixed grate (12) by alternately arranging (2) and (4) in the flow direction of the incineration object, at least one grate is the grate. The total weight of
A grate wear reduction device for a stairs stoker, which is pressed and supported from below by a spring member so as not to act on the downstream grate. 2. The spring member is a leaf spring (14), the lower end of the leaf spring is fixed to a grate shaft, a grate shaft support member or a frame, and the upper end of the leaf spring (14) is a fire. 2. The grate wear reducing device for a stairs stoker according to claim 1, wherein a part of the grate closer to the tip end is pressed and supported from below. 3. The grate wear reducing device for a stairs stoker according to claim 1, wherein the reaction force of the spring material is substantially balanced with the weight of the grate itself. 4. The lower mounting hole of the leaf spring is an elongated hole notch (28) or an elongated hole so that the leaf spring (14) can be adjusted upward and / or downward. The grate wear reducing device for a stairs stoker according to claim 2 or 3, wherein an adjusting member (30) is inserted below the lower end to constitute a leaf spring adjusting mechanism. 5. The bolt hole (34) of the leaf spring holding plate (32) for pressing and fixing the leaf spring (14) with a bolt is an elongated hole. A grate wear reduction device for stair stokers.