GB2112146A - Electrical monitoring systems for gearboxes - Google Patents
Electrical monitoring systems for gearboxes Download PDFInfo
- Publication number
- GB2112146A GB2112146A GB08233483A GB8233483A GB2112146A GB 2112146 A GB2112146 A GB 2112146A GB 08233483 A GB08233483 A GB 08233483A GB 8233483 A GB8233483 A GB 8233483A GB 2112146 A GB2112146 A GB 2112146A
- Authority
- GB
- United Kingdom
- Prior art keywords
- gearbox
- monitoring system
- condition monitoring
- data collection
- collection unit
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
- 238000012544 monitoring process Methods 0.000 title claims abstract description 30
- 238000013480 data collection Methods 0.000 claims abstract description 19
- 230000008878 coupling Effects 0.000 claims description 11
- 238000010168 coupling process Methods 0.000 claims description 11
- 238000005859 coupling reaction Methods 0.000 claims description 11
- 239000012530 fluid Substances 0.000 claims description 9
- 230000005540 biological transmission Effects 0.000 claims description 4
- 239000007787 solid Substances 0.000 claims description 3
- 238000011179 visual inspection Methods 0.000 claims description 2
- 230000000694 effects Effects 0.000 claims 1
- 239000003245 coal Substances 0.000 abstract description 3
- 239000000523 sample Substances 0.000 description 4
- 229910052500 inorganic mineral Inorganic materials 0.000 description 3
- 239000011707 mineral Substances 0.000 description 3
- 230000001939 inductive effect Effects 0.000 description 2
- 238000005065 mining Methods 0.000 description 2
- 230000009467 reduction Effects 0.000 description 2
- 230000008901 benefit Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 239000000498 cooling water Substances 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 238000003745 diagnosis Methods 0.000 description 1
- 238000007689 inspection Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 230000000246 remedial effect Effects 0.000 description 1
- 238000010998 test method Methods 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
- 230000000007 visual effect Effects 0.000 description 1
- 238000004804 winding Methods 0.000 description 1
Classifications
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21F—SAFETY DEVICES, TRANSPORT, FILLING-UP, RESCUE, VENTILATION, OR DRAINING IN OR OF MINES OR TUNNELS
- E21F13/00—Transport specially adapted to underground conditions
- E21F13/06—Transport of mined material at or adjacent to the working face
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01D—MEASURING NOT SPECIALLY ADAPTED FOR A SPECIFIC VARIABLE; ARRANGEMENTS FOR MEASURING TWO OR MORE VARIABLES NOT COVERED IN A SINGLE OTHER SUBCLASS; TARIFF METERING APPARATUS; MEASURING OR TESTING NOT OTHERWISE PROVIDED FOR
- G01D1/00—Measuring arrangements giving results other than momentary value of variable, of general application
- G01D1/04—Measuring arrangements giving results other than momentary value of variable, of general application giving integrated values
- G01D1/06—Measuring arrangements giving results other than momentary value of variable, of general application giving integrated values by intermittent summation
- G01D1/08—Measuring arrangements giving results other than momentary value of variable, of general application giving integrated values by intermittent summation over fixed periods of time
Landscapes
- Engineering & Computer Science (AREA)
- Mining & Mineral Resources (AREA)
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Mechanical Engineering (AREA)
- Life Sciences & Earth Sciences (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Geology (AREA)
- Control Of Conveyors (AREA)
Abstract
A condition monitoring system for a gearbox 7 driving a chain conveyor 1 at a coal mine face, comprises a plurality of condition sensitive transducers mounted on the gearbox 7 for the parameters, e.g. temperatures, oil pressure, load, speed, oil level, to be monitored, output signals from the transducers being fed continuously to a data collection unit 9 serving to scan output signals of all connected transducers, the data collection unit 9 incorporating, or being connected to, means to compute various parameters associated with the gearbox and to convert these signals into a form suitable for transmitting to a data receiving source 11 incorporating a display unit, or for local display. The conveyor 1 can be driven at both ends, when elements 6 to 9 are provided at each end of the conveyor and all signals are fed to 11. <IMAGE>
Description
SPECIFICATION
Monitoring system
This invention relates to a condition monitoring system, particularly for monitoring the condition of a gearbox to drive a conveyor e.g. an armoured, scraper chain conveyor such as is conventionally located long a longwall coal face, and also relates to a conveyor drive arrangement incorporating such a monitoring system, and to a gearbox and conveyor system incorporating such a monitoring system.
In order to drive an armoured, scraper chain conveyor, the conventional configuration is to provide primary power from an electric motor, an output shaft of which is connected via a fluid coupling to a speed reduction or speed change gearbox, an output shaft of which is connected to a toothed drive barrel adapted to engage the drive chain(s) of the conveyor and rotatably mounted in a drive frame constituting the head end of the conveyor. In addition to driving the head end of the conveyor, it is not unknown in circumstances where additional power is required, to drive the tail end of the machine with a similar motor/fluid coupling/gearbox configuration. It will be appreciated that failure of any of these components results in the conveyor being halted, and consequently mineral production being halted.
Hence it is important for instance to maintain adequate oil level in the gearbox and fluid level or "fill" in the fluid coupling, but in the awkward service conditions prevailing underground these basic servicing requirements are often infrequently performed or inadequately remedied. For instance, although portable gearbox casing thermostats are known, by far the more prevalent test procedure as to whether a gearbox bearing is running hot and hence constituting a potential failure point, is simply for the service engineer to place his hand on the gearbox casing in the vicinity of the bearing. Hand-held tachometers are used to measure motor and fluid coupling output speeds, while gearbox oil level is checked via a visual indicator. Such haphazard and rudimentary testing is frequently too late to allow remedial measures to be effective.
According to a first aspect of the present invention, there is provided a condition monitoring system for a gearbox, the system comprising a plurality of condition sensitive transducers mounted on the gearbox for the features to be monitored, output signals from the transducers being fed continuously to a data collection unit serving to scan output signals of all connected transducers, the data collection unit incorporating, or being connected to, means to compute varous parameters associated with the gearbox and to convert these signals into a form suitable for transmitting to a data receiving source incorporating a display unit, or for local display.
According to a second aspect of the present invention, there is provided a condition monitoring system for a conveyor drive arrangement incorporating a gearbox and an electric drive motor connected thereto, the system comprising a plurality of condition sensitive transducers mounted on the gearbox and motor, output signals from the transducers being fed continuously to a data collection unit serving to scan output signals of all connected transducers, the data collection unit incorporating, or being connected to means to compute various parameters associated with the gearbox and motor and to convert these signals into a form suitable for transmitting to a data receiving source incorporating a display unit, or for local display.
The invention also includes a gearbox and conveyor system incorporating a conditon monitoring system as defined above.
Thus the condition of all the features of the gearbox, and any motor, which condition it is required to monitor are continuously monitored and continuously available for inspection.
Conveniently, the data collection unit may be mounted on, or adjacent, the gearbox while the means to compute the various parameters may be a microprocessor.
With the gearbox and conveyor system comprising an electric motor to drive the gearbox via a fluid coupling, the transducers may monitor the output load of the gearbox output shaft-measured by usiilg a strain gauged bearing housing or torque shaft; the gearbox input shaft speed-measured using a magnetic inductive sensor or tachogenerator or shaft encoder; the power being transmitted through the gearbox-computed from gearbox load and speed; the gearbox oil temperature-measured using a temperature sensitive probe immersed in the sump oil; the gerabox oil level-measured by using float switches or other level detection devices e.g. capacitance switches; the motor speed-measured with a magnetic inductive sensor or tachogenerator or shaft encoder; the motor cooling water temperature-measured with a temperature senstive probe; and the motor bearing temperatures-measured with a temperature sensitive probe. If required, other parameters may be measured e.g. gearbox bearing temperatures measured by using temperature sensitive probe(s), motor air temperature, winding temperature, motor current, motor voltage.
Conveniently, the condition monitoring system itself is powered from an intrinsically safe power supply e.g. N.C.B. type DC2, if coal mining for instance is involved.
Preferably, the data receiving source is at a remote location e.g. in a mine roadway if a mine face conveyor gearbox is involved.
It is also preferred for the system to incorporate an automatic shut-down device, operable by switching off electric current to the electric motor, should certain predetermined parameters for each transducer output be exceeded. This may be effected by interrupting a pilot circuit to the motor, and provides the advantage, upon such a trip occurring, that the levels of monitored parameters immediately prior to the trip are available to the service engineer as an aid to fault diagnosis.The
results computed by the data collection unit can, if
underground mining is involved, be passed to an
existing, colliery data transmission system stationed at a location remote from the gearbox e.g. in a roadway adjacent the mineral face, to allow visual inspection and monitoring of the various transducer outputs to be effected by mine personnel, with a selection facility to select specific outputs e.g. oil temperature. Furthermore,
a local display unit is preferably provided,-either permanently or of a plug-in type-to the data
collection unit to allow parameters to be examined
directly. In addition to the monitoring of the functions outlined above, other functions may be
monitored e.g. the vibration level in the gearbox.
The invention is suitable for a conveyor driven
only at its head end, or alternatively driven both at
its head end and at its tail end.
The conveyor drive arrangement may
incorporate either a fluid or a solid coupling or a flexible coupling between the motor and gearbox.
The invention will now be described in greater detail, by way of examples, with reference to the accompanying drawings, in which: Figure lisa diagrammatic plan view of a condition monitoring system in accordance with the invention, for a single-ended conveyor drive; and
Fig. 2 corresponds to Figure 1 but shows a double-ended conveyor drive.
In both Figures, like reference numerals are employed for like components.
An armoured scraper chain conveyor 1 is seated on a mine floor 2 and extends along a mineral face 3. A head end 4 of the conveyor is provided with a drive sprocket (not shown) to drive the chain(s) of the conveyor, but for clarity such chain(s) and attached flight bars are omitted.
The drive sprocket is driven by a conveyor drive arrangement 5, also seated on the mine floor 2 and comprising an electric motor 6 attached via a fluid, solid, or flexible coupling to the input shaft of a speed reduction gearbox 7, the latter having an output shaft connected directly or indirectly to the conveyor drive sprocket. A plurality of condition sensitive transducers of known form e.g. air or oil temperature sensors, oil pressure sensors etc. are mounted on both the gearbox 7 and motor 6 and output signals are fed continuously e.g. along line 8 from the motor 6, to a gearbox mounted data collection unit 9, which scans the output signals of all connected transducers.The data collection unit 9 also incorporates a microprocessor to compute various parameters associated with the gearbox and motor, and to convert these signals into a form suitable either for local display at the gearbox 7 e.g. on a V.D.U. screen or for transmission along a line 10 to a data receiving source 11 located in a mine roadway 12 having a display unit.
Alternatively, the microprocessor may itself be located remote from the conveyor drive arrangement 5, in the roadway 12, instead of on the gearbox 7. A pilot trip line 13 extends from the data receiving source 11 and is activated, to trip out the motor 6, if a monitored parameter exceeds, or falls below, predetermined parameters.
The condition monitoring system in accordance with the invention is itself powered from an intrinsically safe power supply unit 14 associated with the data receiving source 11.
Furthermore, the results computed by the microprocessor are conveyed by a line 15 to a conventional colliery data transmission system 1 6 also located in the roadway 12.
The embodiment illustrated in Figure 2 has a second conveyor drive arrangement 5A at the other, tail end 1 7 of the conveyor 1, its data collection unit 9A is connected via a line 1 OA to the remotely located data receiving source 11.
Claims (16)
1. A condition monitoring system for a gearbox, the system comprising a plurality of condition sensitive transducers mounted on the gearbox for the features to be monitored, output signals from the transducers being fed continuously to a data collection unit serving to scan output signals of all connected transducers, the data collection unit incorporating, or being connected to, means to compute various parameters associated with the gearbox and to convert these signals into a form suitable for transmitting to a data receiving source incorporating a display unit, or for local display.
2. A condition monitoring system for a conveyor drive arrangement incorporating a gearbox and an electric drive motor connected thereto, the system comprising a plurality of condition senstive transducers mounted on the gearbox and motor, output signals from the transducers being fed continuously to a data collection unit serving to scan output signals of all connected transducers, the data collection unit incorporating, or being connected to means to compute various parameters associated with the gearbox and motor and to convert these signals into a form suitable for transmitting to a data receiving source incorporating a display unit, orfo local display.
3. A condition monitoring system as claimed in
Claim 1 or Claim 2, wherein the data collection unit is mounted on, or adjacent, the gearbox.
4. A condition monitoring system as claimed in any preceding Claim, wherein the means to compute the various parameters is a microprocessor.
5. A condition monitoring system as claimed in any one of Claims 2 to 4, wherein the electric motor drives the gearbox via a fluid coupling.
6. A condition monitoring system as claimed in any one of Claims 2 to 4, wherein the electric motor drives the gearbox via a solid coupling.
7. A condition monitoring system as claimed in any one of Claims 2 to 4, wherein the electric motor drives the gearbox via a flexible coupling.
8. A condition monitoring system as claimed in any preceding Claim, wherein the data receiving source is at a remote location.
9. A condition monitoring system as claimed in
Claim 2 and any Claim appendant thereto, incorporating an automatic shut-down device, operable by switching off electric current to the electric motor should certain predetermined parameters for each transducer output be exceeded.
10. A condition monitoring system as claimed in Claim 9, wherein shut-down is effected by interrupting a pilot circuit to-the motor.
11. A condition monitoring system as claimed in any preceding Claim, wherein the results computed by the data collection unit are passed to a data transmission system stationed at a location remote from the gearbox, to allow visual inspection and monitoring of the various transducer outputs to be effect by personnel, with a selection facility to select specific outputs.
12. A condition monitoring system as claimed in Claim 11, comprising a local display unit, either permanently located or of a plug-in-type, at the data collection unit to allow parameters to be examined directly.
13. In combination, a condition monitoring system as defined in any preceding Claim, and a gearbox.
14. In combination, a condition monitoring system as defined in any one of Claims 1 to 10, and a conveyor drive arrangement.
1 5. The combination as claimed in Claim 12, wherein the head end only of the conveyor is driven.
16. The combination as claimed in Claim 12, wherein both the head end and tail end of the conveyor are driven.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB08233483A GB2112146B (en) | 1981-12-10 | 1982-11-24 | Electrical monitoring systems for gearboxes |
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB8137317 | 1981-12-10 | ||
| GB08233483A GB2112146B (en) | 1981-12-10 | 1982-11-24 | Electrical monitoring systems for gearboxes |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| GB2112146A true GB2112146A (en) | 1983-07-13 |
| GB2112146B GB2112146B (en) | 1985-06-05 |
Family
ID=26281515
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB08233483A Expired GB2112146B (en) | 1981-12-10 | 1982-11-24 | Electrical monitoring systems for gearboxes |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB2112146B (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0589507A2 (en) * | 1992-09-22 | 1994-03-30 | General Motors Corporation | Apparatus and method for fluid level determination in automatic transmissions |
-
1982
- 1982-11-24 GB GB08233483A patent/GB2112146B/en not_active Expired
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0589507A2 (en) * | 1992-09-22 | 1994-03-30 | General Motors Corporation | Apparatus and method for fluid level determination in automatic transmissions |
| EP0589507A3 (en) * | 1992-09-22 | 1995-01-04 | Gen Motors Corp | Apparatus and method for fluid level determination in automatic transmissions. |
Also Published As
| Publication number | Publication date |
|---|---|
| GB2112146B (en) | 1985-06-05 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PCNP | Patent ceased through non-payment of renewal fee |