JPH11344292A - Crush deck liner for sintering machine and receiving teeth thereof - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prolong the lifetime of a crush deck liner for sintering machine and receiving teeth thereof. SOLUTION: A crusher deck liner 10 which is mounted on an ore discharge portion of a sintering machine and receiving teeth 22 of a crusher are provided. These liner 10 and receiving teeth 22 are formed by laminating and integrating a plurality of plate-like bodies 13 in a vertical direction. The upper surface of each plate-like body 13 is made thin by a given length and a given depth from a front peripheral end toward the inside and a hardened cladding 12 by welding is applied to the thinned portion such that an upper surface thereof becomes approximately flat. Due to such a constitution, an end surface of the working surface side of the members 10, 22 has a composite structure of a condition where the clad welding layers 12 having a high hardness and base materials 11 are alternately laminated and hence, the clad welding layers 12 having a high hardness including the last clad welding layer 12 effectively work against the weir action from the upper surface. Furthermore, the clad layer 12 extends from the end surface to the inside, it is also effective even when the working surface is retracted due to the wear.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a crusher deck liner and a crusher receiving tooth which are installed at a later stage of a sintering machine.

[0002]

2. Description of the Related Art A sintering plant for sintering a raw material for ironmaking (iron ore powder or the like) will be described with reference to FIG. 1 showing an embodiment of the present invention. Pallet (shoulder) on chain 3 wrapped around 2
4 are attached at predetermined intervals, and the raw material a and the bedding ore b are put into the pallet 4 via the hoppers 5 and 6, respectively. Raw material a and bedding ore b put into the pallet 4
In accordance with the movement of the pallet 4 due to the movement of the chain 3, the sintering reaction is first performed while being ignited in the ignition furnace 7 and being forcibly sucked in the wind box 8. It is sent to 9. At this time, the raw material a is in a lump cake shape (sinter cake, sinter cake, sintered ore) a ′.

[0003] The sintered cake a 'sent to the stone box 9 gets over the crush deck liner 10 at the front edge of the stone box 9 and is sent (falls) to the crusher 20. In the crusher 20, as shown in FIG. 7, the sintered cake a 'is reduced to a predetermined size, for example, 5 by the cooperation of the rotating cavities 21 and the fixed receiving teeth 22.
Crush to 0-300 mmφ. The crushed sintered ore a ″ is a screen 30 having a required size and selected as a product c, while a small one c ′ is fed back (returned). In the figure, 31 is a cooler. , 32 are return conveyors.

[0004]

In the above-mentioned sintering plant, the crash deck liner 10 is subjected to the abrasion effect of being constantly rubbed by the sintered cake (mine) a 'in the red hot state immediately after sintering. Since the teeth 20 are directly involved in the crushing of the sintered ore a, they are subjected to more severe wear. Therefore, the material of the crash deck liner 10 and the receiving teeth 22 are required to have both heat resistance and wear resistance. Conventionally, a casting made of heat-resistant and wear-resistant cast steel or cast iron (for example, white pig iron) is used. ing.

However, the crash deck liner 10 and the receiving teeth 22 made of these materials are also shown in FIGS. 7 (a) and 7 (b).
The part shown by the diagonal lines wears out in a short time and disappears. That is, there is no one that sufficiently satisfies both the heat resistance and the wear resistance, and the problem is dealt with by frequently exchanging the members 10, 22 every 2 to 6 months, for example. Therefore, the burden required for the replacement maintenance is large, and these members 10, 2
The extension of the service life of No. 2 is strongly desired.

An object of the present invention is to extend the life of the crash deck liner and the receiving teeth under the above circumstances.

[0007]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the present invention firstly provides a means for obtaining heat and wear resistance which cannot be obtained by casting by hardfacing welding to the used surface of the member. It was decided to provide wear resistance. At this time, overlay welding in which cemented carbide particles such as tungsten carbide are added to the molten pool and uniformly dispersed in the matrix is effective.

Next, the thickness of the hardfacing layer cannot be made too large, and is at most about 6 mm. Even if it can be made thicker, there is no strength (toughness) of the layer itself,
Peeling and falling off occur during use, and it is not suitable as a wear-resistant member. Therefore, in the present invention, the members provided with the hardfacing layer are laminated and integrated to constitute the crash deck liner and the receiving teeth.

[0009]

DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the invention relating to the crush deck liner is provided at the front edge of a stone box into which sinter is fed from a sintering machine, and the fed sinter passes over the crusher. In a crush deck liner that reaches to, a plurality of plate-like bodies are vertically laminated and integrated, and the upper surface of each plate-like body has a required length and a required depth from the front edge toward the inside. It is possible to adopt a configuration in which stealing meat is performed and hardfacing welding is performed on the stealing portion so that the upper surface is substantially flat.

In one embodiment of the invention relating to a tooth for a crusher, the ore sent from a sintering machine is crushed by the cooperation of a rotating tooth and a fixed tooth. In addition, a plurality of plate-like bodies are vertically laminated and integrated, and the upper surface of each plate-like body has a required length and a required depth inward from an edge facing a demon tooth. And the hardened portion is subjected to hardfacing welding so that the upper surface is substantially flat.

According to this structure, the end face on the use surface side of the member has a composite structure in which the overlay layers and the base material are alternately stacked, and the overlay has a high hardness against the abrasion action from the upper surface. The weld layer works effectively to the end. In addition, since the build-up layer is present from the end face to the inside, it is effective for retreating the use surface due to abrasion.

As a means for forming the overlay welding layer, for example, as described in JP-A-4-371390, a metal inert gas welding machine (MIG welding machine) is used to form a non-oxidizing atmosphere on an iron-based base material. While welding and overlaying a wire forming a matrix of a desired component by shielding, a cemented carbide alloy having a particle size of 0.5 to 3.0 mm is added at a constant rate to the matrix molten pool, and 30 The cemented carbide particles occupying about 70% by weight are evenly dispersed in the matrix to form a composite structure. At this time, the toughness may be increased by using a low-carbon steel material that connects between the cemented carbide particles through a boundary layer containing a part of the alloy component around the cemented carbide particles as a matrix.

[0013]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment is shown in FIGS. 1 to 4, and the structure of the sintering machine 1 and the like is the same as that described above, except for the crash deck liner 10 and the receiving teeth 21 according to the present invention.
Since the operation is the same, the description is omitted.

As shown in FIGS. 3 and 4, the crush deck liner 10 and the receiving teeth 22 according to this embodiment have a length d of about 100 mm, a width e of 300 to 500 mm, and a thickness t of 15.
a stainless steel 11 or a mild steel having a thickness of 6 mm and a length of about 60 mm from one end of the stainless steel 11 or mild steel, and a plate-like body 13 having a hardfacing weld 12 formed on the stolen portion thereof. A required number of sheets 13 are laminated and integrated. The length d of the lowermost plate-shaped body 13 is set to a required length in order to obtain an attachment allowance. Although the integration may be performed by welding, FIG.
And the bolt 14a is screwed in as shown in FIG. This fastening is preferably performed every two sheets, and it is preferable to displace the fastening portion. The heads of the bolt / nut 14 and the bolt 14a are slightly inside the upper surface of the plate-like body 13. In addition, the size and the number of the plate-like bodies 13 and the thickness of the weld 12 are arbitrary.

The hardfacing weld 12 uses a flux cored wire consisting of C: 6% (weight%, the same applies hereinafter), Cr: 27%, and the remaining Fe as a matrix, and MIG welding on the stainless steel 11 The test was performed so that the upper surface was flat by a machine. At this time, the cemented carbide to be added is a sintered grain in which 83% WC grains are combined with 6.8% Co, and the grain size is 0.7 to 1.2 mm (average about 1 mm).
The mixing ratio was 51% with respect to the whole overlay 12.

The crash deck liner 10 of this embodiment
And the receiving teeth 22 had a service life approximately five times that of the conventional white iron cast iron. In addition, only the worn plate 13 needs to be replaced, and at that time, the replacement can be performed manually without using a heavy machine.

The formation structure of the hardfacing weld layer 12 includes:
As shown in FIG.
Ribs 15 may be provided. The rib 15 suppresses peeling of the welding layer 12. on the other hand,
The hardfacing weld layer 12 is made of stainless steel 11 (plate 1
It can also be formed over the entire upper surface of 3).

[0018]

As described above, according to the present invention, the life of the crush deck liner and the receiving teeth can be prolonged, and partial replacement is possible, so that the cost and labor load can be reduced. be able to.

[Brief description of the drawings]

FIG. 1 is a schematic diagram of a sintering plant according to one embodiment.

FIG. 2 is an enlarged view of a main part of FIG. 1;

FIG. 3 is an enlarged perspective view of a main part of FIG. 1;

FIG. 4 is an exploded perspective view of one embodiment of a crush deck liner or receiving teeth.

FIG. 5 is a sectional view of an essential part of each fastening example of the plate-like body.

FIG. 6 is a perspective view of a main part of another embodiment.

7 (a) is a schematic view of a conventional example, and FIG. 7 (b) is a perspective view for explaining abrasion of a crash deck liner or receiving teeth thereof.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Sintering machine 4 Pallet 7 Ignition furnace 8 Wind box 9 Stone box 10 Class deck deck liner 11 Stainless steel plate 12 Hardened build-up welding layer 13 Plate 14 Bolt nut 14a Bolt 20 Crusher 21 Devil tooth 22 Receiving tooth a Raw material (iron ore material) A ', a "Sinter cake (mine)

Claims (2)

[Claims] 1. A crush deck liner 10 installed at the front edge of a stone box 9 into which a sinter ore a ′ is fed from a sintering machine 1 and over which the fed sinter ore a ′ passes over to a crusher 20. A plurality of plate-like bodies 13 are vertically stacked and integrated, and the upper surface of each plate-like body 13 steals meat at a required length and a required depth from the front edge toward the inside, Hardened overlay welding 1 so that the upper surface is almost flat
A crush deck liner characterized by having a 2nd finish. 2. The receiving teeth 22 of the crusher 20 for crushing the sintered ore a ′ sent from the sintering machine 1 by the cooperation of the rotating teeth 21 and the fixed receiving teeth 22; The plate-shaped members 13 are vertically laminated and integrated, and the upper surface of each plate-shaped member 13 steals meat to a required length and a required depth inward from an edge facing the dent 21. A tooth for a crusher, wherein a hardened weld 12 is formed on the steal portion so that the upper surface is substantially flat.