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JP-7855825-B2 - Stoker furnace grate fall prevention structure and stoker furnace

JP7855825B2JP 7855825 B2JP7855825 B2JP 7855825B2JP-7855825-B2

Inventors

  • 藤澤 善博
  • 武田 翼

Assignees

  • ＪＸ金属株式会社

Dates

Publication Date
20260511
Application Date
20230105

Claims (6)

  1. A structure for preventing grate detachment in a stoker furnace, which has a transport path in which movable and fixed stages, each containing multiple grates, are arranged alternately in a stepped manner, The mounting portion is provided for fitting into the original end side of each of the multiple grates constituting the transport path to hold the grates, and for attaching the grates to the stoker furnace body or drive mechanism. A stoker furnace grate fall prevention structure characterized in that at least some of the mounting portions are provided with openings for discharging the material to be processed that falls from above downwards, thereby reducing the amount of material to be processed that accumulates in the gap between the grate and the mounting portion.
  2. The grate fall prevention structure for a stoker furnace according to claim 1, characterized in that at least a portion of the opening is located vertically below the original end of the grate.
  3. The grate fall prevention structure for a stoker furnace according to claim 1, characterized in that the grate is arranged with an inclination such that the tip is lower than the base end.
  4. The stoker furnace grate fall prevention structure according to claim 1, further comprising a bypass path for transporting the material to be processed discharged downward from the opening together with the material to be processed transported in the transport path.
  5. The mounting portion includes a rectangular flat plate portion in plan view to hold a plurality of fire grates arranged in the width direction of the transport path, and ribs are erected on the flat plate portion to maintain the strength of the mounting portion. The stoker furnace grate fall prevention structure according to claim 1, characterized in that the opening is provided on the flat plate portion so as to avoid the rib.
  6. A stoker furnace characterized by comprising a grate fall prevention structure as described in any one of claims 1 to 5.

Description

This invention relates to a structure for preventing the grate from falling off in a stoker furnace, and to a stoker furnace itself. A stoker furnace used for incinerating materials such as electronic component scrap has a transport path formed by alternately stacking a movable stage, which consists of multiple rectangular grates, and a fixed stage, which also consists of multiple rectangular grates, in a stepped arrangement. In this stoker furnace, the materials to be incinerated and transported are achieved by moving the movable stage back and forth so that it slides along the surface of the fixed stage (see Patent Document 1, etc.). Patent No. 4104078 Figure 1 is a schematic side view of a stoker furnace.Figure 2 is a schematic plan view of the transport path and surrounding area of the stoker furnace.Figure 3(A) is a schematic plan view of the trolley connected to the movable step, and Figure 3(B) is a schematic side view of the trolley.Figure 4(A) is a schematic side view illustrating the fitting points between the fixed step and the mounting part, and Figure 4(B) is a diagram illustrating the cause of conventional fixed grates falling off.Figure 5(A) is a schematic side view illustrating the location where the opening is formed, and Figure 5(B) is a schematic top view illustrating the location where the opening is formed.Figure 6(A) is a plan view of the bracket for the upper fixed step, Figure 6(B) is a cross-sectional view taken along line A-A in Figure 6(A), and Figure 6(C) is a cross-sectional view taken along line B-B in Figure 6(A).Figure 7(A) is a plan view of the bracket receiver for the upper fixed step, Figure 7(B) is a cross-sectional view taken along line C-C in Figure 7(A), and Figure 7(C) is a cross-sectional view taken along line D-D in Figure 7(A). The following describes a preferred embodiment of the grate fall prevention structure and stoker furnace for a stoker furnace according to the present invention. [Overall configuration of the stoker furnace] First, the overall configuration of the stoker furnace will be explained with reference to the drawings. Figure 1 is a schematic side view of the stoker furnace, Figure 2 is a schematic plan view of the transport path and its surroundings, Figure 3(A) is a schematic plan view of the trolley connected to the movable stage, and Figure 3(B) is a schematic side view of the trolley. As shown in Figures 1 and 2, the stoker furnace 1 comprises a transport path 100 arranged so as to be surrounded by furnace walls 200, a hopper 300 located below the transport path 100, a trolley 20 connected to the movable stage 12 of the transport path 100, a drive mechanism 400 connected to the trolley 20, and a heating device (not shown) for heating the transport path 100. As shown in Figure 1, the transport path 100 is an incineration transport path arranged in a stepped manner, with two movable stages 12, 12 and two fixed stages 11, 11 stacked alternately in the opposite direction of transport (the direction of the thick white arrow). Hereafter, the two movable stages 12, 12 will be referred to as "lower movable stage 12" and "upper movable stage 12" from the bottom, and the two fixed stages 11, 11 will be referred to as "lower fixed stage 11" and "upper fixed stage 11" from the bottom, as needed. Each of the fixed stages 11, 11, as shown in Figure 2, consists of multiple fixed grates 11S, 11S, ... arranged in a rectangular shape in plan view, spanning the width direction of the transport path 100. These fixed stages 11, 11 are each fixed to the main body side (the side of the furnace wall 200) of the stoker furnace 1 via mounting parts 40, 40. Each of the fixed grates 11S, 11S, ... is arranged with a slope such that the tip is lower than the base end. Each of the movable stages 12, 12, as shown in Figure 2, consists of multiple movable grates 12S, 12S, ... arranged in a plan view along the width direction of the transport path 100. These movable stages 12, 12 are each fixed to the trolley 20 via mounting parts 40, 40. Each of the movable grates 12S, 12S, ... is arranged with a slope such that the tip is lower than the base end. The trolley 20 is made movable in the left-right direction as shown in Figure 3 by a drive mechanism 400 connected to it. As the trolley 20 moves back and forth, the movable steps 12, 12 shown in Figure 1 slide along the surfaces of the fixed steps 11, 11, respectively. This causes the workpieces on the transport path 100 to be transported along the route indicated by the thick white arrows in Figure 1. After being transported along this transport path 100, the workpieces fall to the lower left of Figure 1 and are then transported by a conveyor (not shown) or similar device. As shown in Figures 3(A) and (B), the trolley 20 has a frame structure with beams 22 and 23 arranged in a stepped pattern, and supports the aforementioned movable steps 12, 12 (Figure 1) via mounting parts 40, 40 provided on the beams 22 and 23. The dashed lines