JP5969422B2 - Hardened build-up structure of roll - Google Patents

Description

  The present invention relates to a cured build-up structure of a roll applied to a pulverizing roll of a double roll crusher.

  Improves wear resistance of the outer peripheral surface of a roll such as a roll for crushing a double roll crusher, which rotates around the axis and crushes the material to be crushed between the opposing members in the radial direction. For this reason, it is well known to provide a hardfacing layer so as to cover the outer peripheral surface of the roll body constituting the center of the roll.

  However, a roll provided with a hardened layer as described above may not be able to ensure a predetermined crushing ability. This is because the hardfacing layer is formed by overlay welding on the outer peripheral surface of the roll body, and the welding direction (the direction in which the weld bead extends) is the circumferential direction of the roll. This is because the surface of the layer wears smoothly and slips between the crushed objects.

  On the other hand, a grinding roll or the like of a double roll crusher often has a groove (or tooth) extending in the axial direction on the outer peripheral surface in order to improve the grinding ability (for example, Patent Documents 1 and 2). reference.).

JP 2012-216476 A (paragraph 0065) JP 2006-102564 A (FIG. 3)

  However, when an axial groove is formed on the outer peripheral surface of the hardened layer by machining with respect to a grinding roll having a hardened layer on the outer peripheral portion, the edge of the groove becomes an edge and the object to be crushed is While it becomes easy to bite between the roll and the mating member, the crushing ability is improved. On the other hand, the groove edge of the hardfacing layer is easily lost during use of the roll, and small pieces peeled off from the groove edge are mixed into the material to be crushed. Can be problematic.

  Then, this invention makes it a subject to make the roll for grinding | pulverization which has a hardfacing layer in an outer peripheral part high, and can be used stably.

  In order to solve the above-mentioned problems, the present invention is applied to a roll that rotates around an axis and pulverizes a material to be crushed between opposing members facing in a radial direction. In the hardfacing structure of the roll provided with a hardfacing layer so as to cover the outer peripheral surface of the roll main body constituting the center of the roll, at least one internal groove extending in the axial direction is provided on the outer peripheral surface of the roll main body. Then, a configuration was adopted in which the hardened layer was inserted into the internal groove, and a surface groove extending along the internal groove was formed on the outer peripheral surface of the hardened layer. Here, the internal grooves extending in the axial direction include not only those extending in parallel with the axial direction but also those extending in a direction inclined with respect to the axial direction, such as a spiral shape.

  According to the above configuration, when the roll rotates, the object to be crushed fits into the surface groove formed on the outer peripheral surface of the hardfacing layer and becomes easy to bite between the roll and the counterpart member. In addition, the groove edge of the surface groove of the hardfacing layer becomes smooth, and the surface groove edge portion during use of the roll can be made less likely to be lost.

  Here, if the angle formed by the outer peripheral surface of the hardfacing layer and the side surface of the surface groove is an obtuse angle, the groove edge is less likely to be damaged.

  As described above, the roll built-up structure of the roll according to the present invention is provided with an axial internal groove on the outer peripheral surface of the roll main body constituting the center part of the grinding roll, and the hard built-up layer is inserted into the internal groove. Since the surface groove extending along the inner groove of the roll body is formed on the outer peripheral surface of the hardfacing layer, the crushed object can be easily bitten between the roll and the counterpart member, and the roll It is possible to prevent the surface groove edge from being lost during use. Therefore, the pulverizing roll to which this cured build-up structure is applied has a high pulverizing ability and can be used stably for a long time.

Front sectional drawing of the principal part of the double roll crusher using the roll which has the hardfacing structure of embodiment 1 is a partially cutaway side view of the roll of FIG. Enlarged cross-sectional view along line III-III in FIG. Front sectional drawing of the principal part which shows the modification of the double roll crusher of FIG.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. As shown in FIG. 1, the roll 1 to which the hardfacing structure of this embodiment is applied is disposed in a pair of double roll crushers so as to be opposed to each other in the radial direction, and each of the pair is disposed around the axis. It rotates to direction and grind | pulverizes the to-be-crushed object A bittened between each other.

  As shown in FIG. 1 and FIG. 2, the roll 1 includes a cylindrical roll body 2, a rotating shaft 3 fitted and fixed to the inner periphery of the roll body 2, and a central portion (both axial end portions) of the roll body 2. And a cured built-up layer 4 provided so as to cover the outer peripheral surface of the portion excluding.

  And although illustration is abbreviate | omitted, the pulley is attached to the end of each rotating shaft 3, each pulley is connected with the pulley and belt which were attached to the main shaft of the motor, and each roll 1 is composed of two pulleys and a belt. It is designed to be rotated (pulley driven) by a motor via Here, the driving of each roll may be a synchronous driving using a chain or a gear, but the pulley driving is preferable because it allows a rotational phase shift between the two rolls depending on the driving situation (ie, clogging of the object to be crushed). .

  Four surface grooves 5 extending in parallel with the axial direction are provided on the outer peripheral surface of the hardfacing layer 4 at 90 ° intervals in the circumferential direction. Both end portions in the axial direction of the roll body 2 are formed to be slightly larger in diameter than the central portion so that the outer diameter is substantially the same as the outer diameter of the hardfacing layer 4. An axial short groove 6 continuous to each surface groove 5 is provided.

  In the example shown in FIG. 1, the pair of rolls 1 are arranged so that the phases of the surface grooves 5 (and the short grooves 6) are the same, but the phase of the surface grooves 5 between the rolls 1 is, for example, You may arrange | position so that it may shift | deviate about 45 degrees.

  As shown in FIGS. 2 and 3, an inner groove 7 wider than the surface groove 5 is provided on the outer peripheral surface of the roll body 2 at the same circumferential position as each surface groove 5 of the hardfacing layer 4. ing.

  That is, the hardfacing structure of this embodiment is provided with four internal grooves 7 extending parallel to the axial direction on the outer peripheral surface of the roll body 2, and the hardfacing layer 4 is inserted into each of the internal grooves 7, A surface groove 5 extending along the internal groove 7 is formed on the outer peripheral surface of the hardfacing layer 4. Here, as shown in FIG. 3, the surface groove 5 is formed such that an angle θ between the side surface and the outer peripheral surface of the hardfacing layer 4 becomes an obtuse angle.

  The roll 1 is produced by casting the material of the roll body 2 by casting, and at four locations in the circumferential direction, short grooves 6 are formed on the outer peripheral surfaces at both ends in the axial direction, and the inner peripheral surface is provided on the outer peripheral surface of the central portion. Each groove 7 is formed by machining. Then, overlay welding is performed along the circumferential direction on the outer peripheral surface of the center portion of the roll body 2 to provide the hardened layer 4, and at the same time, a part thereof enters the internal groove 7 of the roll body 2, and the roll A surface groove 5 continuous to the short groove 6 of the main body 2 is formed.

  As described above, the cured built-up structure of this embodiment has the cured built-up layer 4 inserted into the axial internal groove 7 provided on the outer circumferential surface of the roll body 2, so that the cured built-up layer 4 has an outer circumferential surface. Since the surface groove 5 extending along the internal groove 7 is formed, when the roll 1 rotates, a part of the crushed object A fits into the surface groove 5 and becomes easy to bite between the rolls 1. The crushed material A having a size larger than that in the case where there is no material is bitten between the rolls 1 so that the pulverizing ability can be improved.

  In addition, in this embodiment, since the groove edge of the surface groove 5 of the hardfacing layer 4 becomes gentler than in the case where the surface groove of the hardfacing layer is formed by machining, the surface groove is used during the use of the roll 1. The defect of the edge 8 is unlikely to occur (see FIG. 3), and troubles caused thereby can be prevented in advance. Here, the surface groove 5 is formed so that the angle θ formed between the side surface and the outer peripheral surface of the hardfacing layer 4 becomes an obtuse angle, and this makes the surface groove edge portion 8 more difficult to chip.

  Further, when the surface groove is formed by machining, the roll body exposed on the bottom surface may be preferentially worn and the entire roll may have a short life, whereas in this embodiment, the bottom surface of the surface groove 5 is hardened. Since it is formed of the built-up layer 4 and does not wear preferentially, it can be used stably for a long time. The remaining thickness of the hardfacing layer 4, that is, the margin to the use limit, can be easily grasped without directly touching the roll 1 by observing the depth of the surface groove 5.

  FIG. 4 shows a modification in which one of the pair of rolls 1 of the double roll crusher described above is replaced with a normal crushing roll 11 having no surface groove. A roll 11 which is a counterpart member of the roll 1 of the embodiment has the same structure as the roll 1 of the embodiment except that there are no surface grooves and short grooves and internal grooves of the roll body 2. Even in this modified example, there are many cases where sufficient crushing ability as a double roll crusher can be secured.

  In the above-described embodiment, the example in which the surface grooves 5 of the hardfacing layer 4 are provided at four locations in the circumferential direction has been described, but the surface grooves may be provided at least at one location in the circumferential direction. Moreover, the surface groove | channel is not restricted to what extends in parallel with an axial direction like embodiment, but may extend in the direction inclined with respect to the axial direction, such as a spiral shape.

  Further, the present invention is not limited to a roll for crushing a double roll crusher as in the embodiment, but also rotates around an axis, such as a roll for crushing a material to be crushed with a crushing table of a vertical mill, The present invention can be widely applied to a cured build-up structure of a roll that pulverizes an object to be crushed between a counterpart member facing in a direction. In particular, it is used for grinding iron ore, sintered bodies, coke, coal, cement, asphalt, rocks, etc., and can be effectively applied to rolls that require wear resistance, grinding ability and reliability.

  Furthermore, the cured built-up structure of the present invention is applied to wear-resistant members other than rolls that are constantly rubbed against the workpiece, for example, liners lined on the casing inner surface of a kneading mixer, and the depth of the surface grooves is increased. By observing the length, it is possible to grasp the margin to the use limit.

1 Roll 2 Roll body 3 Rotating shaft 4 Hardfacing layer 5 Surface groove 6 Short groove 7 Internal groove 8 Surface groove edge 11 Roll

Claims (1)

It is applied to a roll that rotates around an axis and pulverizes the object to be crushed between the opposing member in the radial direction, and the outer peripheral surface of the roll body that constitutes the center of the roll In the cured build-up structure of the roll covered with the cured build-up layer formed of the build-up weld bead extending in the circumferential direction of the roll body ,
Wherein the outer peripheral surface of the roll body has an internal groove extending in the axial direction is provided at least one, enters the pre-Symbol hardfacing layer on the internal groove, the inner groove on the outer peripheral surface of the hardfacing layer A cured build-up structure of a roll, characterized in that a surface groove extending in the axial direction is formed inside .

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