JP4837438B2 - Pressurized roll for manufacturing coal - Google Patents

Description

  The present invention relates to a coal forming apparatus for producing coal that is used for coke production, and specifically relates to a pressure roll used in a coal forming apparatus.

  Conventionally, as a part of the coal charged in the coke oven, a molded coal obtained by molding pulverized coal (poor quality coal) is used.

  The pulverized coal is supplied to a kneader via a conveyor, and a binder (for example, tar or pitch) is added in the kneader. And after kneading | mixing by rotation operation of the screw provided in the kneading machine, it discharges | emits from the discharge port of a kneading machine.

  The pulverized coal discharged from the kneader is pressed by a pair of pressure rolls to produce a formed coal having a predetermined strength (see, for example, Patent Document 1).

Here, there exists what formed the groove | channel of the predetermined dimension in the surface (contact surface with pulverized coal) of a pressure roll (for example, refer patent documents 2-5). When the groove of the specified dimension is not formed on the surface of the pressure roll, slip occurs between the pulverized coal and the surface of each pressure roll, and the required amount of pulverized coal is caught between the pressure rolls. A problem that cannot be done will occur. Therefore, by forming a groove of a predetermined size on the surface of the pressure roll, it is possible to improve the biting of the pulverized coal and manufacture a coal having a desired density.
Japanese Patent Publication No. 63-13471 JP-A-57-68300 JP-A-63-126696 Japanese Patent No. 3546096 JP-A-2-52200

  In the case of producing coking coal using the above-described conventional pressure roll, the contact with the pulverized coal supplied to the pressure roll or the foreign matter contained in the pulverized coal (for example, metal powder) is added. The surface of the pressure roll is worn away.

  In order to reduce the degree of wear, when the pressure roll is formed of a material having a high hardness, a crack is generated on the surface of the pressure roll due to contact with the foreign matter. On the other hand, when the pressure roll is formed of a low-hardness material, the amount of wear on the surface of the pressure roll increases, and wear is promoted as compared with the case where a high-hardness material is used.

  When wear or the like occurs on the surface of the pressure roll in this way, it is necessary to replace the pressure roll and rebuild the grooves. In this case, the cost associated with the replacement of the pressure roll increases, and the work for replacing the pressure roll is troublesome.

  Accordingly, an object of the present invention is to provide a coal forming apparatus capable of reducing the replacement frequency of the pressure roll and suppressing the accompanying cost increase.

  The present invention is a pressure roll for forming coal using a kneaded product obtained by kneading pulverized coal to which a binder is added, the pressure roll body being rotatable, and the pressure roll body And a sleeve formed of a metal material having impact resistance, and the surface layer portion of the sleeve is formed by overlay welding using an abrasion resistant material, and is formed on the surface of the surface layer portion. A groove extending in the direction of the rotation axis and having a depth of 0.5 to 4 mm is formed.

  Here, the pressure roll body and the sleeve can be formed of different materials. Specifically, a material suitable for the function fulfilled by the pressure roll body and the sleeve can be selected.

  Further, the surface layer portion and the portion other than the surface layer portion in the sleeve can be formed of different materials.

  According to the present invention, the pressure roll can be used continuously only by exchanging the sleeve, and the replacement frequency of the entire pressure roll can be reduced, and the costs associated therewith can be reduced.

  Moreover, the surface layer part which is a part which contacts a kneaded material among sleeves is formed by overlay welding using an abrasion-resistant material, and the surface layer by contact with kneaded materials etc. (including the foreign material in a kneaded material) The wear of the part can be suppressed.

  Furthermore, the surface of the surface layer portion (in other words, the surface in contact with the kneaded product) extends in the direction of the rotation axis of the pressure roll and forms a groove having a depth of 0.5 to 4 mm. The biting property of the kneaded material by the sleeve) can be improved.

  Examples of the present invention will be described below.

  A pressure roll for producing coal char which is Example 1 of the present invention will be described with reference to FIG. Here, FIG. 1A is an exploded perspective view of the pressure roll, and FIG. 1B is an external perspective view of a sleeve constituting a part of the pressure roll.

  As shown in FIG. 1, the pressure roll 1 of the present embodiment includes a roll body 11 and a cylindrical sleeve 12 attached to the outer periphery of the roll body 11. That is, the pressure roll 1 is configured by inserting the roll body 11 into the sleeve 12.

  The roll body 11 has a rotating shaft 11a that is rotatably supported. Here, the diameter of the roll body 11 is set to 1100 mm.

  The sleeve 12 has a surface that comes into contact with the kneaded material supplied from a hopper (not shown). As shown in FIG. 1B, the contact surface has a plurality of grooves extending in the direction of the rotation axis L. 12a is formed. The kneaded product is generated by kneading the pulverized coal and binder supplied into the kneader and then supplied to the hopper.

  The groove portions 12a are arranged at equal intervals (for example, intervals of 3 to 7 mm) in the circumferential direction of the sleeve 12. And the cross-sectional shape of the groove part 12a (the cross-sectional shape in the longitudinal orthogonal surface of the groove part 12a) is formed in the substantially V shape.

  The width of each groove 12a in the circumferential direction of the sleeve 12 is set to a value within a range of 3 mm or more and 7 mm or less. In addition, the length of the sleeve 12a in the radial direction (groove depth) is set to a value within the range of 0.5 mm or more and 4 mm or less.

  Here, if the groove depth of the groove 12a is smaller than 0.5 mm, the pulverized coal biting ability by the pressure roll 1 (sleeve 12) is lowered. Moreover, when the groove depth of the groove part 12a is larger than 4 mm, the pulverized coal is excessively bitten by the pressure roll 1 (sleeve 12), the strength of the formed coal is reduced, and the yield is deteriorated. End up.

  By forming a plurality of groove portions 12 a on the surface of the sleeve 12 in this manner, the pulverized coal (kneaded material) supplied to the pressure roll 1 can be easily bitten, and the pulverized coal is molded by pressurization of the pressure roll 1. Can be improved.

  The interval between the groove portions 12a in the circumferential direction of the sleeve 12 can be set as appropriate.

  Furthermore, it is possible to prepare a plurality of sleeves 12 having different shapes of the groove portions 12a and to use the sleeves 12 in accordance with the use conditions. Here, since the pressure roll 1 of the present embodiment is composed of a sleeve 12 different from the roll main body 11, only the sleeve 12 of a different type needs to be replaced.

  Here, in the present embodiment, the outer peripheral surface of the roll body 11 and the inner peripheral surface of the sleeve 12 are configured by curved surfaces. However, the present invention is not limited to this, and any shape can be used as long as the roll body 11 can be inserted into the sleeve 12. Any shape is possible. Specifically, the cross-sectional shape on the outer peripheral surface of the roll body 11 (the shape when cut by a surface orthogonal to the rotation axis L) is rectangular, and the cross-sectional shape on the inner peripheral surface of the sleeve 12 (same as above). Can be rectangular. In other words, the shape of the outer peripheral surface of the roll body 11 and the shape of the inner peripheral surface of the sleeve 12 may be in a relationship corresponding to each other (engageable relationship).

  As a means for fixing the roll body 11 and the sleeve 12, shrink fitting can be used, whereby the roll body 11 and the sleeve 12 can be rotated integrally.

  Note that the means for fixing the roll body 11 and the sleeve 12 is not limited to shrink fitting, and any structure that can rotate the roll body 11 and the sleeve 12 integrally may be used.

  For example, a protrusion may be provided on one of the outer peripheral surface of the roll body 11 and the inner peripheral surface of the sleeve 12, and a groove that engages with the protrusion may be provided on the other surface. More specifically, a groove that extends in the direction in which the sleeve 12 is attached to the roll body 11 (rotational axis direction) is formed, and when the roll body 11 and the sleeve 12 are attached, the protrusion is slid relative to the groove. It can be set as the structure combined.

  On the other hand, the sleeve 12 and the roll body 11 are preferably fixed by shrink fitting or a key method.

  According to the present embodiment, when the surface of the pressure roll 1 (sleeve 12) is worn by contact with pulverized coal or the like, the pressure roll 1 can be continuously used only by replacing the sleeve 12. Can do. That is, it is not necessary to replace the entire pressure roll 1 as in the prior art, and the cost associated with the replacement of the pressure roll is reduced by replacing only the necessary part (sleeve 12 including a part that is worn away). be able to.

  Moreover, the material according to the function of the roll main body 11 and the sleeve 12 can be used by isolate | separating the pressurization roll 1 into the roll main body 11 and the sleeve 12. FIG. Here, as the material of the sleeve 12 that comes into contact with the pulverized coal, a material that is less likely to generate cracks due to contact with foreign matter (for example, metal powder) contained in the supplied pulverized coal and that is less likely to cause wear. It is necessary to use it. On the other hand, any material can be used as the roll body 11 as long as the roll body 11 can hold the sleeve 12. That is, if an inexpensive material is used as the material of the roll body 11, the cost of the pressure roll 1 can be reduced.

  In this embodiment, the surface layer portion of the sleeve 12 is formed by overlay welding. That is, the sleeve 12 is formed by first forming a cylinder using a material having impact resistance, and performing overlay welding on the surface of the cylinder using a material having excellent wear resistance. Manufactured by. And the process which forms the groove part 12a is performed with respect to the said surface layer part formed by overlay welding.

  Here, the thickness of the sleeve 12 (the length in the radial direction of the pressure roll 1) is set to a value in the range of 92 mm or more and 94 mm or less. Moreover, the thickness of the said surface layer part formed by overlay welding is set to the value within the range of 6 mm or more and 10 mm or less. Here, the thickness of the surface layer portion is larger than the groove depth of the groove portion 12a.

  Examples of the overlay welding method include covering arc welding, MIG welding, MAG welding, TIG welding, submerged arc welding, plasma arc welding, and the like.

  When overlay welding is performed as in the present embodiment, portions of the sleeve 12 other than a worn portion (a portion including the groove portion 12a and performing surface welding) have impact resistance. It can be formed of an inexpensive material (for example, S35C). Thereby, the cost which the sleeve 12 requires can be reduced. In addition, it is also possible to form the surface layer portion of the sleeve 12 and other portions by using the same material.

  On the other hand, as the material for overlay welding, it is necessary to use a material that can form the groove 12a and is not easily damaged by foreign matters contained in the pulverized coal (a material having excellent wear resistance, such as a high Cr material). There is. More specifically, a material containing 26 wt% Cr, 4.8 wt% C, 1.2 wt% Mo and having an HS hardness of 63 to 68 can be used. Here, when the material having the above-described composition is used, a high-strength material of tungsten carbide is obtained by heat during welding, and the material is suitable for the function of the sleeve 12.

It is a disassembled perspective view (A) of a pressure roll in a present Example, and a side view (B).

Explanation of symbols

1: Pressure roll 11: Roll body 12: Sleeve 12a: Groove

Claims (3)

A pressure roll for forming coal using a kneaded product obtained by kneading pulverized coal to which a binder has been added,
A rotatable pressure roll body;
A sleeve mounted on the pressure roll body and formed of a metal material having impact resistance;
The surface layer portion of the sleeve is formed by overlay welding using a wear-resistant material, and a groove having a depth of 0.5 to 4 mm is formed on the surface of the surface layer portion extending in the rotation axis direction. A pressure roll for producing charcoal.   The pressure roll for forming charcoal according to claim 1, wherein the pressure roll body and the sleeve are formed of different materials. The pressure roll for producing charcoal according to claim 1, wherein the surface layer portion and the portion other than the surface layer portion of the sleeve are formed of different materials.

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