JP6362336B2 - Sinter ore crusher - Google Patents

Description

  The present invention relates to a sintered ore crusher for crushing sintered ore.

As the above-mentioned sintered ore crusher, for example, as described in Patent Document 1, a double roll type crusher having a pair of rotating crushing rolls has been proposed. In this sintered ore crusher, a pair of crushing rolls are arranged so that the respective roll surfaces face each other, the pair of crushing rolls are rotated in opposite directions, and the sintered ore charged between the roll surfaces is placed. It is set as the structure which bites and crushes.
There has also been proposed a sintered ore crusher that suppresses variations in the grain size of the sintered ore by forming convex portions on the roll surface and biting the sintered ore by the convex portions.

Here, the roll surface of the crushing roll is subjected to wear and wear due to abrasion and collision with the sintered ore. When the roll surface wear progresses, the gap between the pair of crushing rolls becomes large, and the particle size of the crushed sintered ore varies.
Therefore, in the conventional sintered ore crusher, the roll surface is covered with a hardfacing material such as a chromium-based carbide material to suppress wear.

Japanese Patent No. 2773640

By the way, when wear on the roll surface of the crushing roll proceeds, the operation of the sintered ore crusher is temporarily stopped in order to adjust the gap between the pair of crushing rolls or to exchange the crushing roll itself. There was a need.
Recently, there has been a demand for efficient crushing of sintered ore, and it is necessary to suppress wear on the roll surface and improve the operating efficiency of the sintered ore crusher, as compared with the conventional method.
In particular, in a crushing roll in which a convex portion is formed on the roll surface, the sintered ore is likely to rub and collide with the surface of the convex portion and wear tends to be accelerated, so it is necessary to sufficiently improve the wear resistance. is there.

  The present invention has been made in view of the above-described situation, and greatly improves the durability and wear resistance of the crushing roll, maintains the particle size of the crushed sintered ore for a long period of time, and performs maintenance. The purpose is to provide a sinter crusher that can greatly reduce the work.

In order to solve the above-mentioned problems, a sintered ore crusher according to the present invention has a pair of crushing rolls arranged so that their roll surfaces face each other, and the roll surfaces of the pair of crushing rolls that are rotationally driven. A sinter ore crusher for crushing a sinter charged in between, wherein a cemented carbide layer is formed on at least a part of one or both of the roll surfaces of the pair of crushing rolls. The cemented carbide layer includes tungsten carbide particles and has a Vickers hardness of 1000 Hv, and one or both of the pair of crushing rolls has a convex portion protruding radially outward. And recesses recessed radially inward are formed alternately in the circumferential direction, and a plurality of the recesses and protrusions are provided at intervals in the roll width direction. There is a circumferential groove between them Made is and, at least on the surface of the convex portion, the cemented carbide layer is formed, the convex portion, the cemented carbide block material having a rectangular parallelepiped shape is bonded to the roll surface through the bonding layer It is set as the structure , The said recessed part is built up by the hardening buildup material, It protrudes to the radial direction outer side from the said circumferential groove part, It is characterized by the above-mentioned.

According to the sintered ore crusher having this configuration, a cemented carbide layer containing tungsten carbide particles is formed on one or both of the roll surfaces of the pair of crushing rolls. Since the Vickers hardness is 1000 Hv or more, the wear resistance of the roll surface is drastically improved. Therefore, the gap between the crushing rolls does not vary, and the particle size of the crushed sintered ore can be stabilized over a long period of time. Further, maintenance intervals such as replacement of crushing rolls and adjustment of gaps between crushing rolls can be extended, and the operating efficiency of the sintered ore crusher can be greatly improved.
In addition, since the sintered ore is bitten by the convex portions protruding radially outward, the particle size of the sinter ore crushed is adjusted by the interval between the convex portions, and it is possible to suppress variation in the particle size. it can.
When a plurality of convex portions are formed on the roll surface, the convex portions are promoted to contact with the sintered ore and are particularly easily worn. Therefore, by forming a cemented carbide layer having a Vickers hardness of 1000 Hv or more on the surface of the convex part, it becomes possible to suppress the abrasion of the convex part and stabilize the grain size of the sinter ore to be crushed for a long period of time. be able to.

Here, the cemented carbide layer preferably has a thickness of 10 mm or more.
In this case, the thickness of the cemented carbide layer having a Vickers hardness of 1000 Hv or more is ensured, and the wear resistance on the roll surface of the crushing roll can be reliably improved.

  As described above, according to the present invention, the use durability and wear resistance of the crushing roll can be greatly improved, the size of the crushed sintered ore can be kept constant for a long period of time, and maintenance work can be greatly reduced. A sintered ore crusher can be provided.

It is the schematic of the sintered ore crusher which is embodiment of this invention. It is a top view of the sintered ore crusher shown in FIG. It is explanatory drawing which expanded a part of crushing roll. FIG. 4 is a cross-sectional view taken along the line XX in FIG. 3. It is expansion explanatory drawing of an uneven | corrugated | grooved part.

Below, the sintered ore crusher which is embodiment of this invention is demonstrated with reference to attached drawing.
The sintered ore crusher 1 according to this embodiment is used when crushing a sintered ore S obtained by sintering iron ore powder as a raw material to be fed into a blast furnace into a predetermined particle size.

As shown in FIG. 1, the sintered ore crusher 1 according to the present embodiment includes a pair of crushing rolls 10 (10A, 10B) and a rotation driving device that rotationally drives the pair of crushing rolls 10 (10A, 10B). (Not shown), a hydraulic device (not shown) that moves the pair of crushing rolls 10 (10A, 10B) close to and away from each other, and a casing 3 that houses the pair of crushing rolls 10 (10A, 10B).
The casing 3 includes an input port 5 that opens upward and a discharge port 7 that opens downward.

  As shown in FIGS. 1 and 2, the pair of crushing rolls 10 (10A, 10B) are arranged such that the axis OA of one crushing roll 10A and the axis OB of the other crushing roll 10B are parallel to each other, and It arrange | positions so that the clearance gap g may arise slightly between mutual roll surfaces. Here, as shown in FIG. 1, the above-described charging port 5 is disposed so as to open above the gap g between the roll surfaces of the pair of crushing rolls 10 (10A, 10B).

As shown in FIG. 2, the crushing roll 10 (10A, 10B) includes a roll body 11 (11A, 11B) and a support shaft portion 19 (19A, 19B) protruding from the roll body 11 in the direction of the axis O (OA, OB). 19B).
As shown in FIG. 2, the roll body 11 (11A, 11B) is composed of a plurality of divided rolls 12 (12A, 12B) divided in the roll width direction. The roll main body 11 (11A, 11B) is configured by the divided rolls 12 (12A, 12B).

  As shown in FIGS. 3 and 4, the roll surface of the split rolls 12 (12A, 12B) constituting the roll body 11 (11A, 11B) retreats in the radial direction and the convex part 13 protruding outward in the radial direction. Concave and convex portions 15 are formed in which the concave portions 14 are alternately arranged in the circumferential direction. A plurality of the uneven portions 15 are provided at intervals in the roll width direction, and a circumferential groove portion 17 is formed between the uneven portions 15. The roll diameter in the circumferential groove portion 17 is 2R as shown in FIG.

  Here, as shown in FIG. 3, the circumferential position of the convex portion 13 in the concave and convex portion 15 is arranged so as to correspond to the concave portion 14 of the adjacent concave and convex portion 15, and the crushing roll 10 (10 </ b> A, 10 </ b> B) The convex portions 13 are arranged in a staggered pattern on the roll surface. Moreover, as shown in FIG. 4, the convex part 13 is arrange | positioned by the pitch P at equal intervals in the circumferential direction.

A cemented carbide layer 21 containing tungsten carbide particles and having a Vickers hardness of 1000 Hv is formed on the surface of the convex portion 13. The cemented carbide layer 21 has a thickness of 10 mm or more.
In the present embodiment, the cemented carbide layer 21 has a Vickers hardness of 1000 Hv or higher and high toughness.

Here, in this embodiment, the whole convex part 13 is comprised with the cemented carbide alloy containing tungsten carbide particle | grains and Vickers hardness set to 1000 Hv.
That is, as shown in FIGS. 3 and 5, in this embodiment, the cemented carbide block material 30 having a height H, a length L, and a width D is bonded to the roll surface via the bonding layer 31. The convex part 13 is formed. Here, the height H of the convex part 13 comprised with the cemented carbide is 10 mm or more.

  Further, the concave portion 14 slightly protrudes radially outward from the circumferential groove portion 17, and the protruding height of the concave portion 14 is h. Here, the concave portion 14 is built up by the hardened material 22, and the thickness of the hardened material 22 is set to the protrusion height h of the above-described concave portion 14. Note that the Vickers hardness of the hardfacing material 22 is set lower than the Vickers hardness of the cemented carbide layer 21 described above.

Next, the usage method of the sintered ore crusher 1 which is this embodiment is demonstrated.
First, as shown in FIG. 1, the pair of crushing rolls 10A and 10B are driven to rotate in the rotational directions RA and RB, respectively.
And the sintered ore S is supplied toward the space between a pair of crushing roll 10A, 10B through the insertion port 5. FIG.
Then, the sintered ore S is crushed between the pair of crushing rolls 10A and 10B, and crushed to a predetermined particle size. In addition, the particle size of the crushed sintered ore S is adjusted by the gap g between the roll surfaces of the pair of crushing rolls 10A and 10B.

  According to the sintered ore crusher 1 of the present embodiment configured as described above, the cemented carbide layer 21 containing tungsten carbide particles is formed on the roll surfaces of the pair of crushing rolls 10A and 10B. Since the cemented carbide layer 21 has a Vickers hardness of 1000 Hv or more, the wear resistance of the roll surface is drastically improved. Therefore, the gap g between the crushing rolls 10A and 10B does not vary, and the particle size of the crushed sintered ore S can be stabilized over a long period of time. In addition, maintenance intervals such as replacement of the crushing rolls 10 (10A, 10B) and adjustment of the gap between the crushing rolls 10A, 10B can be increased, and the operating efficiency of the sintered ore crusher 1 can be greatly improved. It becomes possible.

  In the present embodiment, the cemented carbide layer 21 has a thickness of 10 mm or more. In this embodiment, the cemented carbide layer 21 having a thickness of 10 mm or more and a Vickers hardness of 1000 Hv or more is secured, and the crushing roll 10 The wear resistance on the roll surface of (10A, 10B) can be reliably improved.

  Moreover, in the sintered ore crusher 1 which is this embodiment, since the uneven | corrugated | grooved part 15 which has the convex part 13 and the recessed part 14 is formed in the roll surface of a pair of crushing roll 10A, 10B, the convex part 13 and When the sintered ore S is bitten by the concave portions 14, the particle size of the sintered ore S crushed according to the interval between the convex portions 13 is controlled, and the particle size is stabilized.

  Furthermore, in the sintered ore crusher 1 which is this embodiment, the cemented carbide layer 21 is formed on the surface of the convex part 13, and specifically, the entire convex part 13 is formed by the cemented carbide block material 30. Since it comprises, it becomes possible to suppress abrasion of the convex part 13, and the dispersion | variation in the particle size of the sintered ore S to be crushed can be suppressed. In addition, the life of the crushing roll 10 (10A, 10B) can be extended.

  Moreover, in the sintered ore crusher 1 which is this embodiment, since the roll main body 11 (11A, 11B) of the crushing roll 10 (10A, 10B) is comprised by the some division | segmentation roll 12 (12A, 12B). Only the split rolls 12 (12A, 12B) that are severely worn can be replaced, and the maintenance work of the crushing rolls 10 (10A, 10B) can be greatly reduced.

As mentioned above, although the sintered ore crusher which is one Embodiment of this invention was demonstrated, this invention is not limited to this, It can change suitably in the range which does not deviate from the technical idea of the invention.
Although this embodiment demonstrated as what formed the convex part and the recessed part on the roll surface of the crushing roll, it is not limited to this, It is good also as a smooth roll in which the convex part and the recessed part are not formed. In this case, a cemented carbide layer can be formed by sticking a plate-shaped cemented carbide to the roll surface.
Moreover, although demonstrated as what formed the convex part and the recessed part in both a pair of crushing rolls, you may form a convex part and a recessed part only in one crushing roll.

Furthermore, in the present embodiment, the entire convex portion has been described as being composed of a cemented carbide block material. However, the present invention is not limited to this, and a cemented carbide layer is formed on a part of the surface of the convex portion. It only has to be.
Moreover, the shape of a convex part and a recessed part is not limited to what was illustrated by embodiment, The thing of another shape may be sufficient.
Furthermore, in this embodiment, although demonstrated as what comprised the crushing roll with the division | segmentation roll, it is not limited to this, The crushing roll of another structure may be sufficient.

  Below, the result of the confirmation experiment implemented in order to confirm the effect of this invention is demonstrated.

  As an example of the present invention, sinter ore crushing was performed using the sinter ore crusher shown in the present embodiment, and the amount of wear on the protrusions after one month of use was evaluated. In addition, the height H of the cemented carbide block material which comprises a convex part is 10 mm.

As a conventional example, a convex part and a concave part were formed in the same manner as the crushing roll shown in the present embodiment, and a hardened layer of 4 to 6 mm was formed on the surface of the convex part. Using this crusher, crushing of the sintered ore was carried out, and the amount of wear of the convex portion after one month of use was evaluated.
The evaluation results are shown in Table 1.

In the conventional example in which the hardened layer was formed, the wear amount after one month exceeded 6 mm, the hardened layer disappeared, and the base material itself was worn.
On the other hand, in the example of the present invention, the amount of wear after one month was 0.2 mm. It was confirmed that the wear was sufficiently suppressed and the roll life could be extended significantly.

DESCRIPTION OF SYMBOLS 1 Sinter crusher 10 Crush roll 13 Convex part 14 Concave part 21 Cemented carbide layer

Claims (2)

A sinter ore crusher that has a pair of crushing rolls arranged so that their roll surfaces face each other and crushes the sintered ore charged between the roll surfaces of the pair of crushing rolls that are rotationally driven. And
A cemented carbide layer is formed on at least a part of one or both of the roll surfaces of the pair of crushing rolls,
The cemented carbide layer includes tungsten carbide particles, and has a Vickers hardness of 1000 Hv,
On one or both of the pair of crushing rolls, an uneven portion in which convex portions projecting radially outward and concave portions retreating radially inward are alternately arranged in the circumferential direction is formed. Has been
The concavo-convex part is provided with a plurality of intervals in the roll width direction, and a circumferential groove part is formed between the concavo-convex parts,
The cemented carbide layer is formed on at least the surface of the convex part,
The convex portion has a structure in which a cuboid cemented carbide block material is joined to the roll surface via a joining layer ,
The sinter ore crusher characterized in that the concave portion is built up with a hardfacing material and protrudes radially outward from the circumferential groove portion .   The sintered ore crusher according to claim 1, wherein the cemented carbide layer has a thickness of 10 mm or more.

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