US3018061A - Ball mill - Google Patents

Description

Jan. 23, 19 M. s. MISCHANSKI BALL MILL 3 Sheets-Sheet 1 Filed Nov. 12, 1959 15 ill.

JNVENTOR.

fhPO/V a. N/JfHANf/r/ Jan. 23, 1962 M. s. MISCHANSKI BALL MILL 3 Sheets-Sheet 2 Filed Nov. 12, 1959 III Jan. 23, 1962 Filed Nov. 12. 1959 3 Sheets-Sheet 3 ATTORNEY.

3,018,0fil Patented Jan. 23, 1962 *Llited flee are secured by bolts 20 or equivalent fastening means to $018,061 the outer ends of the truncated sections respectively. BALL MEL The to sectio 7 11 ludes a ho er sha ed u er end Myron S. Mischanslri, 27 Englewood Road, Clifton, NJ. 9 p I} 1 C P p pp Figed NW. 12 19599 gag. N0. 352,343 M1 through which the sol d material to be ground is fed 4 (312mm m a to the mill. The top section 17 opens into the truncated section 15 with the peripheral inner face 22 formed as a continuation of the upper portion of the annular face solid material. 1?,- of the medial section 12. Similarly the lower trun- The invention comprehends a ball mill in which magcated section 16 has its inner peripheral face 23 formed netically attractable balls roll against an inner annular as a continuation of the lower portion of the inner anface portion of the mill by the magnetic attraction of nular face 13. The lower tubular section 18 provides an electromagnets mounted for rotation about the periphery outlet for discharging the ground material from the mill. of the mill in a plane extending through said inner face In order to direct the material to be crushed and portion. pulverized toward the inner face 13 of the medial sec- Ball mills have been provided for grinding solid matction 12 and between the same and the rotating balls 14, rial in batches or a small quantity thereof at a time, a conical shaped bafile 24 is provided which is supported which is deposited in the mill with metal balls and when within the upper section 15 by a plurality of radially arthe grinding is completed, the ground material is separanged circumferentially spaced straps 25 affixed thereto rated from the balls and removed from the mill. This at their inner ends and secured at their outer ends in type of ball mill requires some means for separating the 20 radially arranged slots in the upper face of the medial ground material from the balls before another batch or section 12. The baflle 24 slopes toward the inner face quantity can be inserted in the mill. In order to provide 13 of the medial section 12 and has its lower peripheral a continuously operated ball mill in which the ground edge annularly spaced from the inner face 22 of the material is removed from the mill as the same is ground, truncated section 15 to permit of the continuous gravitathe present invention includes means for continuously 25 tional feeding of the solid material. The solid material feeding the material to be ground toward the peripheral may be granular in foim or partly divided and of a size area of engagement of the magnetically attractable balls to pass freely between the bafile 24 and the truncated with the inner face portion of the mill and for continusection 15. ously discharging the crushed and pulverized material in Below the baflle 24 is a conical shaped deflector or a direction away from the area of engagement of the shield 26 which is located axially within the medial secballs with said face portion of the mill. tion 12 and extends upwardly between the balls and is A further object of the invention is to provide means removably supported by a plurality of radially arranged for supporting the balls so as to retain the same i adcircumferentially spaced straps 27 secured thereto at jacent relation to the inner face of the mill and substantheir inner ends and secured at the outer ends in radially i ll i h plang f th electromagnets h h ill arranged slots in the lower face of the medial section is not in use so that the balls will be attracted by the Th hi d 26 functions to direct the crushed and electromagnets when the same are energized, pulverized material dropping from the balls during rota- Still another object of the invention is to provide a ball n d wn the Coni al fa e thereof. The shield also funcmill of said character which is so constructed and ar- U035 10 pp the balls W n t mill iS not in use so ranged th t th parts th f may b readily remcved as to retain the same substantially in a horizontal plane for cleaning the interior of the mill. extending medially through the medial section.

With the foregoing and other objects in view, refer- The balls 14 rotate in an annular P about the ence is now made to the following specification and 30- side face of the medial section 12 Of the casing by means companying drawings in which the preferred embodiof the magnetic attraction of a plurality of electromagnets ments th of are ill trat d, 29 which are mounted for rotation about the medial In the drawings: section 12 with the axis of each of the cores 30 thereof FIG. 1 is a vertical sectional view through a ball mill being radially disposed in a I ta p ane xt nding constructed in accordance with the invention. medially through the medial Section- The electromag- FIG. 2 is a horizontal sectional view taken approxinets 29 correspond in number to the number of the balls mately on line 2-2 of FIG. 1 on a reduced scale. and are equally spaced circumferentially about the medial FIG. 3 is a top plan view of the mill. section. Each of the electromagnets 29 produces an elec- FIG. 4 is a vertical sectional view of a modified form tric field which extends through the medial section 12 of ball mill constructed in accordance with the invenand attracts one of the balls. The medial section 12 is tion. of any desired hard non-magnetic material which is per- Referring to the drawings, the ball mill includes a meable to a magnetic field such as ceramic materials, hard casing 10 having a base 11 adapted to be affixed to a supmetal alloys such as bronzes and manganese alloys and port for supporting the casing in upright relation. The the like, and other hard materials and metals not apprecasing includes a medial section 12 of annular formaciably affected by a magnetic field. The balls 14 may be tion having an annular inner face 13 preferably of consteel, nickel, tungsten carbide and the like or other matecave formation in vertical section against which face a rials and metals attracted 'by a magnetic field. Heavy plurality of magnetically attractable balls 14 are adapted balls facilitate crushing and pulverizing of the material. to roll to effect crushing and pulverizing of the solid However, hard lighter balls may be employed. material fed therebetween. The electromagnets 29 are mounted on a metal frame The casing also includes upper and lower truncated sec- 32 Which is rotatably supported on the base 11. The tions 15 and 16 and top and bottom cylindrical sections said frame includes a ring member 33 having apertures 17 and 18. The said sections are in axial alignment 34 in which the cores 30 are secured with the inner ends with the medial section 12 to provide a passageway for of the cores located in closely spaced relation to the the material to be ground. The truncated sections 15 outer periphery of the medial section 12. The frame 32 and 16 are secured by bolts 19 or equivalent fastening also includes upper and lower frame sections 35 and 36 means to the upper and lower ends respectively of the respectively which are secured to the ring member 33 by medial section, while the cylindrical sections 17 and 18 bolts 37 or equivalent fastening means and with radial This invention relate to a ball mill for comminuting material fed thereto.

bearings 38 and 39 arranged between the tubular sections 17 and 18 of the casing and the upper and lower ends of said frame sections respectively. A thrust bearing 40 is arranged between the base 11 and the lower end of the frame section 3 6. The frame sections 35 and 36 are provided with a plurality of circumferentially spaced openings 41 and 42 respectively for admitting air between the frame 32 and the casing 18 so as to prevent overheating of the electromagnets 29.

The frame 32 is rotated about the casing 16 by any desired means such as by an endless belt 44 engaging in an annular groove 45 provided in the frame section 36 and with the belt driven by any desired means (not shown). The electromagnets 29 are continuously energized and leading from the ends of each of the coils are conductors 46 and 47 which are electrically connected to conductor rings 48 and 49 affixed to the frame section 36 adjacent the bottom thereof. The conductor rings are insulated from the frame section 36 by means of an insulating ring 50 secured in fixed position between said frame section and the conductor rings. The conductor rings are connected with a source of current supply by means of conductor brushes 51 and 52 adjustably carried by a holder 53 which is of non-conductive material and is supported on the base by a stud 54 to dispose the brushes with the inner ends thereof in engagement with the conductor rings respectively. One of the brushes is adapted to be connected with the positive side of an electric power source by a conductor 55 while the other is adapted to be connected with the negative side thereof by a conductor 56.

A double pole switch 57 is interposed in circuit with said conductors for making and breaking the circuit with the electromagnets. Energizing the electromagnets produces magnetic fields which attract the balls 14 causing the same to rotate with the electromagnets about the medial section 12 of the casing and against the annular face 13 thereof so as to crush and pulverize the solid The electromagnets and balls may be of any desired number and in the present embodiment five electromagnets and five balls are provided.

The material to be crushed and pulverized may be fed to the mill either by gravity or air pressure. In employing air pressure for this purpose the material may pass through the mill either downwardly or upwardly, and as illustrated in FIG. 4 of the drawings, a bafile is provided for directing the material upwardly toward the inner face of the medial section and the rotating balls.

With the exception of the formation and arrangement of the baflie, the mill in this form of the invention is similar to the previous form and includes a casing 60 having a base 61 adapted to be affixed to a support. The casing also includes a medial section 62. of annular formation having an annular face 63 against which a plurality of magnetically attractable balls 64 are adapted to roll. The casing also includes upper and lower truncated sections 65 and 66 and top and bottom cylindrical sections 67 and 68. The upper and lower truncated sections 65 and 66 are similar to the sections and 16 in the previous form of the invention while the top section 67 is the same as the top section 17 in the previous form with the exception that the hopper is eliminated. The bottom section 68 is similar to the section 18 with the exception that the same projects below the base for connection with a conduit for feeding material by air pressure. The said sections are similarly secured together by bolts 69 or equivalent fastening means and a plurality of electromagnets 70 corresponding in number to the number of balls 64 are provided. The electromagnets 70 are similar to the electromagnets 29 in the previous form of the invention and are mounted on a metal frame 72 similar to the metal frame 32, the metal frame 72 being rotatably supported on the base 61. The electromagnets 70 are continuously energized during operation of the mill and leading from the ends of the coils of the electromagnets are conduits 76 and 77 which are connected to conductor rings 78 and 79- mounted in fixed position on the lower portion of the frame 72 as in the previous form of the invention. The rings are insulated from the frame 72 by an insulating ring 88 and are engaged by conductor brushes 81 and 82 adjustably carried by a holder 83 of non-conductive material which is supported on the base 61 by a stud 84.

In this form of the invention a hollow baffie 86 is provided having conical shaped upper and lower wall portions 87 and 88 and a concave medial wall portion 90 extending peripherally thereabout and which forms a support for the balls 64 when the mill is not in operation. The baflle 86 is secured in position by a plurality of radially arranged upper and lower straps 90 and 91 affixed thereto at their inner ends and with their outer ends secured in radially arranged slots in the upper and lower faces of the medial section 62. The lower wall portion 88 of the inatfie functions to direct the material to be crushed and pulverized between the balls 64 and the inner face 63 of the medial section 62 while the upper wall portion 87 reduces the area of the flow within the upper section 65 so as to avoid reduction in air pressure.

A double pole switch 93 is interposed in circuit with the conductor rings 73 and 7? for connecting the electromagnets with a source of current supply. Energizing the electromagnets produces magnetic fields which extend through the medial section 62 and attract the balls causing the same to rotate with the electromagnets respectively about the medial section 62 and against the annular face 63 thereof.

The medial section 62 like the medial section 12 may be of any desired hard non-magnetic material which is permeable to a magnetic field such as ceramic materials, hard metal alloys such as bronzes and manganese alloys and the like, and other hard materials and metals not appreciably aifected by a magnetic field. The balls 64 may be steel, nickel, tungsten carbide and the like or other materials and metals attracted by a magnetic field.

The frame '72 is rotated about the casing 68 by any desired means such as by an endless belt 94 engaging in an annular groove 95 provided in the frame 72 with the belt driven by any desired means (not shown).

in this form of the invention the material to be ground which may be in granular or partly broken condition is fed upwardly by fluid pressure through the bottom section 68. Any desired means may be provided for feeding the material to the bottom section. The lower wall portion 88 of the battle directs the material radially toward the annular face 63 of the medial section and the balls 64 rotating against the annular face 63 by the magnetic attraction of the electromagnets 7t) rotating about the periphery of the medial section functions to crush and pulverize the material. The crushed and pulverized material is carried along with the fluid pressure and discharged through the truncated section 65. Any desired means may be employed for conducting the crushed and pulverized material from the truncated section 65.

While the preferred forms of the invention are shown and described herein, the same is not so limited but shall cover and include any and all modifications thereof which fall within the purview of the invention.

What is claimed is:

1. In a ball mill for comminuting solid material, a casing arranged on a vertical axis and having an opening for feeding the material to be comminuted and another opening for discharging the comminuted material therefrom, said casing having an annular inner face intermediate said openings against which the solid material is comminuted, a plurality of magnetically attractable balls arranged within said casing for rolling engagement against said annular face for comminuting the solid material, means carried by said casing supporting said balls in adjacent relation to said annular face when the balls are at rest, means carried by said casing for directing the material to be comminuted toward said annular face,

a plurality of electromagnets corresponding in number to the number of said balls arranged with their cores disposed radially about said annular portion of said casing, a driven rotatable frame on which said electromagnets are mounted, means rotatably supporting said frame on said casing, and conductor means carried by said frame and connected with said electromagnets, and means carried by said casing engaging said conductor means for connecting said electromagnets with a source of current supply to energize said plurality of electromagnets simultaneously and continuously during the rotation of the same frame to thereby establish magnetic fields passing continuously through said balls respectively for causing said balls to rotate against said annular face with the rotation of said frame.

2. In a ball mill for comminuting solid material, a casing arranged on a Vertical axis and having an opening for feeding the material to be comminuted and another opening for discharging the comminuted material therefrom, said casing having an annular inner face intermediate said openings against which the solid material is cornminuted, a plurality of magnetically attractable balls arranged within said casing for rolling engagement against said annular face for comminuting the solid material, means carried by said casing supporting said balls in adjacent relation to said annular face when the balls are at rest, means carried by said casing for directing the material to be comminuted toward said annular face, a plurality of electromagnets corresponding in number to the number of said balls arranged with their cores disposed radially about said annular portion of said casing, a driven rotatable frame on which said electromagnets are mounted, means rotatably supporting said frame on said casing, and conductor means connected with said electromagnets adapted to be connected to a source of current supply to energize said plurality of electromagnets simultaneously and continuously during the rotation of the same frame to thereby establish magnetic fields passing continuously through said balls respectively for causing said balls to rotate against said annular face with the rotation of said frame.

3. In a ball mill for comminuting solid material, a casing arranged on a vertical axis and having open upper and lower ends for feeding the material to be comminuted and for discharging the comminuted material therefrom, said casing having an intermediate annular portion provided with an annular inner face against which the solid material is comminuted, a plurality of mag: netically attractable balls arranged within said casing for rolling engagement against said annular face for comminuting the solid material, means carried by said casing supporting said balls in adjacent relation to said annular face when the balls are at rest, means carried by said casing for directing the material to be comminuted toward said annular face, a plurality of electromagnets corresponding in number to the number of said balls arranged with their cores disposed radially about said annular portion of said casing, a driven rotatable frame on which said electromagnets are mounted, means rotatably supporting said frame on said casing, conductor rings carried by said frame, means electrically connecting said electromagnets with said rings, and contact means carried by said casing engaging said rings for connecting said electromagnets with a source of current supply to energize said electromagnets to thereby establish magnetic fields passing through said balls respectively for causing said balls to rotate against said annular face with the rotation of said frame.

4. In a ball mill for comminuting solid material, a casing having an opening for feeding the material to be comminuted and another opening for discharging the comminuted material therefrom, said casing having an annular wall portion provided with an annular inner face located intermediate said openings against which the solid material is comminuted, a plurality of magnetically attractable balls arranged within said casing for rolling engagement against said annular face for comminuting the solid material, means carried by said casing for directing the material to be comminuted toward said annular face, a plurality of electromagnets arranged with the cores disposed radially about said annular wall portion, a driven rotatable frame rotatably supported on said casing and on which said electromagnets are mounted for rotation therewith, said electromagnets when energized providing magnetic fields passing through said annular wall portion and attracting said balls for causing said balls to rotate against said annular face with the rotation of said frame, conductor rings carried by said frame, means electrically connecting said electromagnets with said rings, and contact means carried by said casing engaging said rings for connecting said plurality of electromagnets simultaneously and continuously during the rotation of the same frame with a source of current supply to energize said electromagnets to thereby establish magnetic fields passing continuously through said balls for causing said balls to rotate against said annular face with the rotation of said frame.

References Cited in the file of this patent UNITED STATES PATENTS 529,766 Wheeler Nov. 27, 1894 1,546,330 Ullrich July 14, 1925 1,894,106 Lehrack Jan. 10, 1933 FOREIGN PATENTS 24,392 Great Britain May 21, 1908

Images