JP2007090190A - Planet ball mill - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a planet ball mill which can easily adjust a cooling amount of a mill pot by a cooling fin. <P>SOLUTION: A cooling fin is formed of circumferencially bipartited separate fin members 12. Flanges 12b arranged at the bipartited end parts of the fin members 12 are energized to their approaching direction by a pan spring 16a, and clamped and locked to a casing 3 of the periphery of a mill pot 5 by a bolt 14 and a nut 15. Thereby, fin members 12 of different radiation amount can be clamped and locked from the outer peripheral side of the mill pot 5 as the mill pot 5 is installed to a mill body and the cooling amount of the mill pot 5 by the cooling fin can be easily adjusted. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a planetary ball mill.

  A planetary ball mill rotates a plurality of mill pots supported on a table while revolving, and inserts a ball such as a steel ball as a crushed material and a grinding medium into each mill pot, and pulverizes the crushed material by colliding with the ball. Is. Normally, each mill pot is rotatably supported by bearings on upper and lower tables that rotate about the central axis, and by meshing the sun gear provided on the central axis and the planetary gear provided on the rotational axis of each mill pot, Rotates around its own rotation axis while revolving around its central axis. In some cases, a cylindrical casing is provided on the outer periphery of each mill pot, and the mill pot is supported by upper and lower tables via the casing.

  In such a planetary ball mill, pulverization heat is generated by energy to pulverize the crushed object. For example, when pulverizing a substance containing a large amount of iron oxide, the temperature in the mill pot rises to 200 ° C. or more due to the pulverization heat. In some cases, the temperature may be 150 ° C. or higher on the outside.

  In such a planetary ball mill in which the temperature rise of the mill pot due to the heat of grinding is large, the outer periphery of the mill pot is cooled in order to prevent deterioration of the quality of the material to be crushed due to the temperature rise and performance deterioration of the bearing supporting the mill pot. There is a type in which fins are provided and cooling water or cooling air is sprayed onto the cooling fins to radiate and cool the mill pot (for example, see Patent Document 1). In what is described in Patent Document 1, a plurality of grooves as cooling fins are integrally formed in the circumferential direction of the outer peripheral surface of the mill pot.

JP 2002-172338 A (FIG. 3)

  In the planetary ball mill described in Patent Document 1, a plurality of concave grooves as cooling fins are integrally formed on the outer peripheral surface of the mill pot, so the height and pitch of the concave grooves (cooling fins) cannot be changed. There is a problem that it is difficult to adjust the amount of cooling (heat radiation) of the mill pot accompanying the change of the type of crushed object and the operating conditions. Also, even if a plurality of concave grooves are formed in a separate ring-shaped member and can be exchanged, the mill pot is supported by a table on the upper and lower peripheries, so the mill pot is removed from the mill body and the ring-shaped member is attached and detached. There is a need to.

  Therefore, an object of the present invention is to make it possible to easily adjust the amount of cooling of the mill pot by the cooling fins.

  In order to solve the above-mentioned problems, the present invention comprises a plurality of mill pots that rotate while revolving, and in a planetary ball mill in which cooling fins are provided on the outer peripheral side of these mill pots, the cooling fins are arranged in the circumferential direction. A configuration is adopted in which the fin members are formed by separate divided fin members, and the divided end portions of these fin members are urged toward each other by a spring and fixed to be tightened to the outer peripheral side of the mill pot.

  That is, the cooling fins are formed by separate fin members divided in the circumferential direction, and the divided end portions of these fin members are biased toward each other by a spring so as to be tightened to the outer peripheral side of the mill pot. By fixing, the cooling fins with different heat radiation amounts can be fastened and fixed from the outer peripheral side with the mill pot attached to the mill body, and the cooling amount of the mill pot by the cooling fins can be easily adjusted. In addition, when there exists a casing in the outer periphery of a mill pot, a cooling fin can be fixed to the outer peripheral surface of this casing.

  By providing a predetermined gap between the divided end portions of the fin member, even if the circumferential expansion of the fin member due to thermal expansion is larger than the circumferential expansion of the mill pot or the casing, the fin member The divided fin members can be securely tightened and fixed so that the divided end portions do not contact each other.

  In the planetary ball mill of the present invention, the cooling fins are formed by separate fin members divided in the circumferential direction, and the divided end portions of these fin members are biased toward each other by a spring, and the outer periphery of the mill pot is Since it is fixed so as to be tightened to the side, cooling fins having different heat radiation amounts can be fastened and fixed from the outer peripheral side while the mill pot is attached to the mill body, and the cooling amount of the mill pot by the cooling fin can be easily adjusted.

  By providing a predetermined gap between the divided end portions of the fin member, even if the circumferential expansion of the fin member due to thermal expansion is larger than the circumferential expansion of the mill pot or the casing, the fin member The divided fin members can be securely tightened and fixed so that the divided end portions do not contact each other.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. As shown in FIGS. 1 and 2, the planetary ball mill includes a vertical central shaft 1 that is rotationally driven, upper and lower tables 2a and 2b that rotate integrally with the central shaft 1, and casings on the upper and lower tables 2a and 2b. 3 is basically constituted by four mill pots 5 rotatably supported by a bearing 4 through meshing of a sun gear 6 attached to the central shaft 1 and a planetary gear 7 attached to each casing 3. Each mill pot 5 rotates while revolving around the central axis 1. The entire mill is covered with a soundproof cover 8, and the central shaft 1 supported by a bearing 10 on a base 9 is driven to rotate by a belt (not shown) wound around a pulley 11.

  The mill pot 5 includes a cylindrical main body 5a that is inserted into and fixed to the casing 3 from above and is provided with an upper lid 5b and a lower lid 5c. The upper lid 5b is opened to load a material to be crushed and a grinding medium. The object to be crushed and crushed is taken out by opening the lower lid 5c.

  As shown in FIGS. 2 and 3, a fin member 12 divided into two in the circumferential direction forming cooling fins is attached to the outer peripheral surface of each casing 3 between the upper and lower tables 2a and 2b. In addition, the heat radiation and cooling are performed by water or air sprayed from a nozzle 13 provided in the soundproof cover 8. These fin members 12 are made of an aluminum-based material having a high thermal conductivity, and can be exchanged for ones having different heights and pitches of the fins 12a. The casing 3 and the mill pot 5 are made of a steel material.

  As shown in FIG. 4, in the fin member 12 divided into two parts, the flange 12b provided at the divided end portion is fastened with bolts 14 and nuts 15 so that the flanges 12b come close to each other with a plurality of disc springs 16a. It is fixed to the outer peripheral surface of the casing 3 so as to be biased. In addition, a gap δ is provided between the end surfaces of the opposing flanges 12b, and the fin member 12 formed of an aluminum material having a thermal expansion amount approximately three times larger than that of the steel material is larger than that of the casing 3. Even if the elongation in the circumferential direction occurs, the flanges 12b are not in contact with each other. Therefore, even if the clamping force due to the bias of the disc spring 16a is ensured, the temperature of the mill pot 5 rises due to pulverization heat, and the casing 3 and the fin member 12 are thermally expanded, the fins fixed to the outer peripheral surface of the casing 3 The member 12 does not fall off. Even if a difference in thermal expansion occurs between the casing 3 and the fin member 12 due to a temperature difference or the like, the two are kept in close contact with each other by tightening by the bias of the disc spring 16a, so that a good heat conduction state is maintained. Can do.

  FIG. 5 shows a modification of FIG. In this modification, the flanges 12b are urged toward each other by a coil spring 16b instead of the disc spring 16a.

  In the above-described embodiment, the cooling fin is formed by a fin member divided into two in the circumferential direction, and the fin member is fastened and fixed to the outer peripheral side of the mill pot via the casing, but the cooling fin is a fin member divided into three or more. These fin members may be directly clamped and fixed to the outer peripheral side of the mill pot.

A longitudinal sectional view showing an embodiment of a planetary ball mill Sectional view along the line II-II in FIG. 1 is an enlarged longitudinal sectional view showing a part of the mill pot in FIG. Sectional view along line IV-IV in FIG. Sectional drawing which shows the modification of FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Center shaft 2a, 2b Table 3 Casing 4 Bearing 5 Mill pot 6 Sun gear 7 Planetary gear 8 Soundproof cover 9 Base 10 Bearing 11 Pulley 12 Fin member 12a Fin 12b Flange 13 Nozzle 14 Bolt 15 Nut 16a Disc spring 16b Coil spring

Claims (2)

  In a planetary ball mill provided with a plurality of mill pots that rotate while revolving, and provided with cooling fins on the outer peripheral side of these mill pots, the cooling fins are formed by separate fin members divided in the circumferential direction. A planetary ball mill characterized in that the divided end portions of the fin member are urged toward each other by a spring and are fastened to the outer peripheral side of the mill pot.   The planetary ball mill according to claim 1, wherein a predetermined gap is provided between the divided end portions of the fin member.

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