# US 8,540,175 B2 · Method and device for controlling the operation of a gyratory crusher

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- Number: US 8,540,175 B2
- Document ID: US8540175B2
- Status: Granted
- Kind: B2
- Application number: 12/659,477
- Filed: 2010-03-10
- Published: 2010-09-16
- Granted: 2013-09-24
- Earliest claimed: 2009-03-11
- Assignees: Sandvik Intellectual Property AB
- Applicants: Mauricio Torres; Mats Lindqvist; Kjell-Åke Svensson
- Inventors: Mauricio Torres; Mats Lindqvist; Kjell-Åke Svensson
- Web page: https://patentgrep.com/patent/US8540175B2

## CPC

- B02C 2/047: {and with head adjusting or controlling mechanisms (B02C2/042, B02C2/06 take precedence)}
- B02C 2/04: with vertical axis
- B02C 25/00: Control arrangements specially adapted for crushing or disintegrating
- 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

A gyratory crusher comprises a first crushing shell mounted on a crushing head, and a second crushing shell mounted on a machine frame, a crushing gap being formed between said first and second crushing shells. A method of controlling the operation of said crusher comprises measuring a parameter being representative of the stresses to which the crusher is exposed during the crushing of material, determining an average value of said parameter, determining a deviation value of said parameter, calculating a peak value based on said average value and said deviation value, comparing said peak value to a reference value, and controlling the operation of the crusher in view of said comparison between said peak value and said reference value.

## Claims

### Claim 1

A method of controlling the operation of a gyratory crusher, which comprises a first crushing shell mounted on a crushing head, and a second crushing shell mounted on a machine frame, a crushing gap being formed between said first and second crushing shells, material to be crushed being fed to said crushing gap, comprising
measuring a parameter being representative of the stresses to which the crusher is exposed during the crushing of material,
determining an average value of said parameter,
determining a deviation value of said parameter,
calculating a peak value based on said average value and said deviation value,
comparing said peak value to a reference value, and
controlling the operation of the crusher in view of said comparison between said peak value and said reference value.

### Claim 2 (depends on 1)

A method according to claim 1, wherein said parameter is chosen among a measured mechanical stress in the crusher, a pressure in a hydraulic system controlling the width of said crushing gap, and a power of a motor driving the crusher.

### Claim 3 (depends on 1)

A method of claim 1, wherein said average value, said deviation value, and said peak value are determined based on values of said parameter measured during a time interval Δt that is a multiple of the rotation period of an eccentric of the crusher, said eccentric being operative for making the crushing head gyrate.

### Claim 4 (depends on 3)

A method of claim 3, wherein said time interval At corresponds to from 1 to 10 rotation periods of the gyratory crusher.

### Claim 5 (depends on 1)

A method of claim 1, wherein said average value, said deviation value, and said peak value are moving values.

### Claim 6 (depends on 1)

A method of claim 1, further comprising controlling the width of said crushing gap in view of said comparison between said peak value and said reference value.

### Claim 7 (depends on 1)

A method of claim 1, wherein said deviation value of said parameter is the standard deviation value of said parameter.

### Claim 8 (depends on 1)

A method of claim 1, wherein the operation of the crusher that is controlled is a width of a crushing gap.

### Claim 9

A method of controlling the operation of a gyratory crusher, which comprises a first crushing shell mounted on a crushing head, and a second crushing shell mounted on a machine frame, a crushing gap being formed between said first and second crushing shells, material to be crushed being fed to said crushing gap, comprising
measuring a parameter being representative of the stresses to which the crusher is exposed during the crushing of material,
determining an average value of said parameter,
determining a deviation value of said parameter,
calculating a peak value based on said average value and said deviation value,
comparing said peak value to a reference value, and
controlling the operation of the crusher in view of said comparison between said peak value and said reference value,
wherein the calculation of said peak value comprises adding said average value of said parameter multiplied by a first constant, and said deviation value of said parameter multiplied by a second constant.

### Claim 10

A method of controlling the operation of a gyratory crusher, which comprises a first crushing shell mounted on a crushing head, and a second crushing shell mounted on a machine frame, a crushing gap being formed between said first and second crushing shells, material to be crushed being fed to said crushing gap, comprising
measuring a parameter being representative of the stresses to which the crusher is exposed during the crushing of material,
determining an average value of said parameter,
determining a deviation value of said parameter,
calculating a peak value based on said average value and said deviation value,
comparing said peak value to a reference value, and
controlling the operation of the crusher in view of said comparison between said peak value and said reference value,
wherein said peak value is calculated in accordance with the following equation:
peak value=K1*average value+K2*deviation value.

### Claim 11 (depends on 10)

A method of claim 10, wherein K1 is about 1, and K2 is from about 0.5 to about 5.

### Claim 12

A method of controlling the operation of a gyratory crusher, which comprises a first crushing shell mounted on a crushing head, and a second crushing shell mounted on a machine frame, a crushing gap being formed between said first and second crushing shells, material to be crushed being fed to said crushing gap, comprising
measuring a parameter being representative of the stresses to which the crusher is exposed during the crushing of material,
determining an average value of said parameter,
determining a deviation value of said parameter,
calculating a peak value based on said average value and said deviation value,
comparing said peak value to a reference value, and
controlling the operation of the crusher in view of said comparison between said peak value and said reference value,
wherein said deviation value of said parameter is the magnitude of the Fourier component at the frequency of rotation of an eccentric of the crusher, said eccentric being operative for making the crushing head gyrate.