Hand-held instrument monitors plant-floor conditions
A portable predictive-maintenance instrument, which stores up to 500 points of machinery data, performs multiple condition-monitoring functions. Called the CMVL10 Picolog Data Logger, the instrument performs fast, accurate vibration analysis and condition monitoring of bearings and rotating machinery such as pumps and fans. It lets technicians detect early signs of deterioration in machine components so corrective action can be taken during scheduled maintenance periods, thus reducing downtime and boosting productivity. The pocket-sized device weighs just 6 oz and is 6-in. long. Operators take measurements in seconds by applying a sensor to a machinery point and pressing a button.
The device performs three types of measurements: enveloping, standard vibration, and “SEE” acoustic emission monitoring. Enveloping isolates high-frequency acceleration signals amid general machine noise so the operator can detect incipient damage to bearings, gears, and other rotating components before catastrophic failure occurs. Both enveloped peak and enveloped average data are available.
In performing standard vibration analysis of rotating machinery, Picolog provides velocity levels to an ISO standard, in either mm/sec (rms) or in./sec (equivalent peak) modes.
SEE is a new acoustic emissionmonitoring technique that detects early bearing defects, lubrication problems due to contamination or breakdown, and fretting. It detects high frequency emissions in the 250,000 to 350,000-Hz range.
Picolog can also be linked, through a PC, to Prism2 Jr., a predictive- maintenance software package that processes the collected data and displays it in chart form. Data displayed includes a historical record of machine conditions and projections of measurement data. In this way, the software warns the user of potential machine problems and predicts when measurements will reach unacceptable levels.
SKF Condition Monitoring, San Diego.
Right-angle speed reducers
Combination helical and bevel-gear speed reducers offer energy savings through high efficiency (94 to 96%). Standard Unicase modular units, for either double or triple reduction, are available from 1,500 to 25,000 lb-in. output torque. Backlash of double-reduction units can be controlled down to 30 min. Cast-iron housing mounts vertically, horizontally, or upside down. Mounting options include foot or flange, solid input shaft, or NEMA C-face motor. The output shaft can be solid single, double extended, or hollow with torque arm.
Standard Industrial Products Co., Houston.
Liner-type doctor bearing: good medicine for shakes, abrasions
“Simplicity” doctor bearing is for linear and rotary-motion uses as an OEM or replacement component in wet or dry-end paper machine use. The bearing cartridge spreads the internal load to relieve high surface pressures occurring in rolling-element bearings. A liner of Frelon, a Teflon composite, provides low friction and wear, and self-lubrication. The liner can also damp vibration through the bearing before it can transfer to the doctor blade. Lower vibration means fewer web breaks.
According to the maker, the design eliminates shaft tracking and bearing material cold flow. Also, the liner withstands applications where the bearing is immersed. A combination of constant, even pressure, scraping, lubrication grooves, and a double-lip seal keeps dirt from entering and damaging the shaft.
Sizes can be as large as 13-in. length; 1-ft OD, and 81/2-in. ID.
An optional induced-lubrication assembly applies oil from a reservoir through a wick. Even if the reservoir is empty, oil in the wick keeps lubricating the bearing.
Pacific Bearing Co., Rockford, Ill.
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Permanent-magnet hysteresis brake
Permanent magnets mean no power supply is needed. Torque is infinitely adjustable between maximum and minimum by rotating one end of the brake with respect to the other, thus varying magnetic field intensity and, therefore, brake torque.
Three standard sizes are 1.3 to 3.3-in. OD, with torque from 1/2 to 26 lb-in.
Accu-Clutch Co. Inc., Columbia, Conn.
Geared ac servomotors offer wide ranges of speed & torque
M Series of eight geared servomotors also provides reductions ranging from 9:1 to 80:1 in six steps. Input speed is 1,000 rpm. Output torque ranges from 18.4 lb-ft for the smallest motor to 3,177 lb-ft at 18 rpm for the largest. M Series is for machine- tool feeds and transfer machines.
R Series of five comes in reductions of 5:1, 10:1, and 25:1. With 3,000-rpm input speed and 5:1 reduction, the gearmotor supplies 90 oz-in. torque. Using the 25:1 reduction, the largest motor provides 1,805 oz-in. torque. R Series is for robot wrists and XY tables.
Yaskawa Electric America Inc., Northbrook, Ill.
Spring-engaged brake for heavy work
Spring-engaged brakes are used to stop loads when the brake is to be on for long periods, where braking is required when power fails, in emergency-stop situations, and in applications where large loads must be held in place.
Purolator Products Co. Inc., Elmira, N.Y.
High-torque, low-speed synchronous gearmotor
Other features include output speed of 0.4 to 20 rpm, torque to 40 lb-in., startstop action in 5 to 25 msec, and no significant current rise during start.
Bodine Electric Co., Chicago.
Electronic gage reads bores fast
Dyer Co., Lancaster, Pa.
Miniature BLDC motor can run at 100,000 rpm
The hollow shaft lets fluids pass easily, providing a path for irrigation when needed. Construction is all stainless steel. Windings can withstand autoclaving temperatures.
Transicoil Inc., Medical Products Div., Valley Forge, Pa.
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Nonmetallic bearings can slip right in
Maximum PV is 10,000; continuous operating temperature, 240 to 240 F.
PIC Design, Middlebury, Conn.
Multispeed ac motors
The concept also permits 3 and 4- speed units, for example: 2,700, 3,600, and 4,200-rpm motors, and 1,200, 2,400, 3,600, and 4,200-rpm motors.
NCS Inc., Celina, Ohio.
Electrical multiple-disc brake: torque tightly packaged
The drive cup is designed into the coil housing, which reduces cost and axial space requirements and simplifies installation. Most of these brakes are used in oil but, in some applications, they can be used dry.
Carlyle Johnson Machine Co., Manchester, Conn.
Washdown brakes come in C-face and close-coupled styles
Stearns Div., Rexnord Corp., Milwaukee.
BLDC motors to 600 hp
Construction is all cast-iron. Enclosure ratings include DPBV, DPSV, DPFG, TENV, TEAO, TEPV, TE Liquid Cooled, and MSHA TEXP. Base speeds are 300 to 1,750 rpm; continuous torque ratings, 750 to 1,800 lb-ft; and typical motor full-load efficiency, 97%.
Powertec Industrial Corp., Rock Hill, S.C.
Snap-fit conduit protectors make cable access easy
Igus Inc., East Providence, R.I.
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Servo-duty gearbox
Peerless-Winsmith Inc., Springville, N.Y.
Conveyor belt fasteners
Flexible Steel Lacing Co., Downers Grove, Ill.