# US 2014/0151474 A1 · Oscillation monitor for pulverizer journal assembly

> Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt

- Number: US 2014/0151474 A1
- Document ID: US20140151474A1
- Status: Published application
- Kind: A1
- Application number: 14/068,136
- Filed: 2013-10-31
- Published: 2014-06-05
- Earliest claimed: 2010-11-22
- Assignees: ALSTOM Technology Ltd
- Applicants: ALSTOM Technology Ltd
- Inventors: Richard Brian Stone
- Web page: https://patentgrep.com/patent/US20140151474A1

## CPC

- B02C 25/00: Control arrangements specially adapted for crushing or disintegrating
- B02C 15/04: Mills with pressed pendularly-mounted rollers, e.g. spring pressed
- G08B 21/187: {Machine fault alarms}
- 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})
- G08B: SIGNALLING SYSTEMS, e.g. PERSONAL CALLING SYSTEMS; ORDER TELEGRAPHS; ALARM SYSTEMS

## Abstract

A pulverizer 10 includes a journal assembly 19 with a grinding roller 18 that grinds solids in a grinding table 14. The oscillations of the journal assembly 19 are monitored by an angular displacement transducer (ADT) 32 that creates a composite signal. A controller 83 receives the composite signal from the ADT and compares it with known information of the pulverizer 10. It then identifies abnormal situations such as damage to a grinding roll 14, the grinding table 14, the spring assembly 20 and other parts of the pulverizer 10 before they cause major damage.

## Claims

### Claim 1

(Canceled)

### Claim 2

(Canceled)

### Claim 3

(Canceled)

### Claim 4

(Canceled)

### Claim 5

(Canceled)

### Claim 6

(Canceled)

### Claim 7

(Canceled)

### Claim 8

(canceled)

### Claim 9

A method of identifying potential problems of a pulverizer comprising the steps of:
providing a pulverizer housing with a rotatable shaft, a grinding table mounted on the rotatable shaft, at least one journal assembly pivotally mounted on the pulverizer housing, a grinding roll coupled to the at least one journal assembly, a spring assembly mounted on the pulverizer housing;
providing an angular displacement transducer (ADT) coupled to the journal assembly by a coupling and a coupling adapter, with the ADT, coupling and coupling adapter each supported by a mounting bracket for ADT measurement of angular displacement of the journal assembly and electronic signal generation corresponding to the measurement of angular displacement;
acquiring ADT measurement of angular displacement of the journal assembly over time; and
generating an electronic signal indicating a potential problem with the pulverizer when the measurement of angular displacement is abnormal.

### Claim 10 (depends on 9)

The method of claim 9 wherein the measurement of angular displacement is abnormal when the measurement of angular displacement exceeds a maximum angular displacement.

### Claim 11 (depends on 9)

The method of claim 9 wherein the measurement of angular displacement is abnormal when the measurement of angular displacement is below a minimum angular displacement.

### Claim 12 (depends on 9)

The method of claim 9 wherein the measurement of angular displacement is abnormal when the measurement of angular displacement is an average angular displacement greater than a predetermined threshold.

### Claim 13

A device for measuring operation of at least one journal assembly pivoting on a trunnion shaft of a pulverizer comprising:
an angular displacement transducer (ADT) operable to measure degree of rotation of a trunnion shaft;
a coupling attached between the trunnion shaft and a shaft connected to the ADT to transmit rotation of the trunnion shaft to the ADT for continuous ADT to measurement of the trunnion shaft degree of rotation; and
a controller coupled to the ADT for reading the measured trunnion shaft degree of rotation and for identifying abnormal journal assembly operation conditions.

### Claim 14 (depends on 13)

The device of claim 13 further comprising:
a suction-type coupling adapter coupled between the coupling and the trunnion shaft, having air ducts for ambient air to the trunnion shaft.

### Claim 15 (depends on 13)

The device of claim 13 further comprising:
a pressure retention-type coupling adapter coupled between the coupling and the trunnion shaft for sealing the trunnion shaft to prevent pressurized seal air leakage.