# US 2015/0144718 A1 · Impact grinding plant for the communition of ore > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2015/0144718 A1 - Document ID: US20150144718A1 - Status: Published application - Kind: A1 - Application number: 14/093,014 - Filed: 2013-11-28 - Published: 2015-05-28 - Earliest claimed: 2013-11-28 - Inventors: Carey Hunker - Web page: https://patentgrep.com/patent/US20150144718A1 ## CPC - B02C 19/0012: {Devices for disintegrating materials by collision of these materials against a breaking surface or breaking body and/or by friction between the material particles (also for grain)} - B02C 19/16: Mills provided with vibrators ({roller mills B02C4/423}; tumbling mills B02C17/14) - B02C 23/02: Feeding devices ({for grain mills B02C11/04; for roller mills B02C4/286}; transport devices in general B65G) - B02C 23/12: with return of oversize material to crushing or disintegrating zone - B02C: CRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN ({household tools and machines for pulverising foodstuffs, e.g. coffee and spice mills A47J42/00; pharmaceutical mortars A61J3/02; mechanical processing of refuse and garbage B03B9/06; dressing mould materials by grinding B22C5/04}; obtaining metallic powder by crushing, grinding or milling B22F9/04; {recovery of plastics by disintegrating B29B17/00; crushing raw materials in starch making C08B30/02; beaters for papermaking D21D1/02; crushing devices specially for transport in mines E21F13/002; slag crushing devices F23J1/00; fuel milling devices in combustion apparatus F23K1/00; household devices for crushing coal F24B15/02; ice disintegrating devices F25C5/02}) ## Abstract There is provided an impact grinding assembly. The assembly, according to one aspect, includes a pair of conveyors for conveying at least partially unground material. Each conveyor has a lower portion and an upper portion which is spaced-apart above its lower portion. The assembly includes a pair of vibrating impact plates aligning below the upper portions of respective ones of the conveyors to receive the at least partially unground material. A first one of the impact plates operatively directs material thereon to the lower portion of a second one of the conveyors. A second one of the impact plates operatively directs material thereon to the lower portion of a first one of the conveyors. The impact grinding assembly may further include a material-separation assembly for removing material from the conveyors which has a particle size no greater than a desired particle size. ## Claims ### Claim 1 An impact grinding assembly comprising: an impact plate upon which unground material operatively impacts; and a vibratory mechanism operatively connected to the impact plate, the vibratory mechanism causing the impact plate to vibrate for moving the material so impacted away from the impact plate thereafter. ### Claim 2 (depends on 1) The assembly as claimed in claim 1 wherein the impact plate is part of a vibratory pan feeder and extends in a substantially horizontal direction. ### Claim 3 (depends on 1) The assembly as claimed in claim 1 wherein the impact plate is part of a vibratory feeder having a first portion in the form of the impact plate and a second portion connected to and extending from the first portion, the second portion of the feeder comprising a material-separation grid. ### Claim 4 (depends on 1) The assembly as claimed in claim 1 further including a conveyor positioned to drop the unground material onto the impact plate. ### Claim 5 (depends on 1) The assembly as claimed in claim 1, wherein the vibratory mechanism causes a bed of material to form above the impact plate onto which further unground material operatively impacts. ### Claim 6 (depends on 4) The assembly as claimed in claim 4, further including a material-separation grid and mill balls, the mill balls moving along the conveyor and dropping onto the unground material, creating at least partially ground material thereby, and the mill balls being separated from the at least partially ground material via the material-separation grid. ### Claim 7 (depends on 3) The assembly as claimed in claim 3 further including a screen positioned below the material-separation grid and through which fully ground material passes. ### Claim 8 An impact grinding assembly comprising: a pair of conveyors for conveying at least partially unground material, each having a lower portion and an upper portion which is spaced-apart above its lower portion; and a pair of vibrating impact plates aligning below the upper portions of respective ones of the conveyors to receive said at least partially unground material, a first one of the impact plates operatively directing material thereon to the lower portion of a second one of the conveyors and a second one of the impact plates operatively directing material thereon to the lower portion of a first one of the conveyors. ### Claim 9 (depends on 8) The assembly as claimed in claim 8 wherein the conveyors are inclined, at least in part, in opposite directions. ### Claim 10 (depends on 8) The assembly as claimed in claim 8, wherein the impact plates extend in a substantially horizontal direction and are substantially level with the lower portions of the conveyors. ### Claim 11 (depends on 8) The assembly as claimed in claim 8 further including a pair of chutes extending from the upper portions of respective ones of the conveyors to respective ones of the impact plates. ### Claim 12 (depends on 8) The assembly as claimed in claim 8 further including a material-separation grid positioned adjacent to at least one of the impact plates, the material-separation grid selectively removing at least partially ground material from the conveyors. ### Claim 13 (depends on 12) The assembly as claimed in claim 12, further including mill balls which are moved along a first one of the conveyors, the balls being dropped onto the at least partially unground material, creating at least in part the at least partially ground material thereby, the balls being separated from the at least partially ground material and returned to a second one of the conveyors via the material-separation grid. ### Claim 14 (depends on 12) The assembly as claimed in claim 12, the at least partially ground material resulting from being dropped from a first one of the conveyors including fully ground material, the assembly further including a screen positioned below the material-separation grid and through which the fully ground material passes, and the assembly further including an intermediate conveyor, the balance of the at least partially ground material returning to a second one of the conveyors via the intermediate conveyor. ### Claim 15 (depends on 8) The assembly as claimed in claim 8 wherein the conveyors are flexible sidewall conveyors. ### Claim 16 (depends on 8) The assembly as claimed in claim 8, further including a plurality of mill balls, the lower portions of the conveyors aligning with respective ones of the impact plates for operatively receiving the mill balls and the at least partially unground material, the mill balls and the at least partially unground material dropping from the upper portions of the conveyors, and the assembly further including a material separation assembly interposed between one of the impact plates and one of the conveyors, the separation assembly directing the mill balls back to said one of the conveyors and enabling partially ground material to pass therethrough. ### Claim 17 (depends on 16) The assembly as claimed in claim 16 wherein the impact plates extend in a substantially horizontal direction and wherein the assembly further includes a grizzly feeder, at least one of the impact plates being part of the grizzly feeder. ### Claim 18 (depends on 1) An impact grinding plant comprising: a plurality of the impact grinding assemblies as claimed in claim 1, each assembly further including a conveyor for elevating the unground material, and a separation assembly for separating out ground material and operatively returning still unground material to the conveyor for impacting with its corresponding impact plate again; and a feeder assembly which selectively conveys unground material to respective ones of the conveyors of the impact grinding assemblies. ### Claim 19 (depends on 18) The plant as claimed in claim 18 wherein the impact grinding assemblies are arranged in parallel and the feeder assembly has a conveyor-feeding chute through which the unground material is selectively fed to respective ones of the impact grinding assemblies, the chute being moveable in a direction transverse to the impact grinding assemblies. ### Claim 20 A method of impact grinding comprising: elevating unground material via a conveyor; and dropping the material onto a vibrating impact surface such that 15 to 25% of the material is ground to a particle size no greater than a desired particle size; separating out the material that has said particle size no greater than the desired particle size; and returning the rest of the material back to the conveyor to be dropped again.