5.2 TYPES OF AUTOMATIC LUBRICATION SYSTEMS
Automatic
lubrication system generally fall into below categories:
OIL MIST SYSTEM
Mostly used in
high-speed precision service
Example:
- · Grinding machinery
- · Woodworking
- · Air craft compressor
Working
principle:
·
Injecting
oil drop by drop into a stream of low pressure air to circulate just enough oil
to wet the operating surface
ORIFICE-CONTROL
SYSTEM
- · Use only oil as a lubricant with viscosity usually limited to 300 SUS or less
- · Orifice used to control the amount of lubrication going into a bearing
- · Best for small, single purpose machinery in a stable environment.
- · Generally cheap, and simple to design and install.
- · Additional point can be added without disrupting the original system
- · Not suitable for area has vary temperature, viscosity change as temperature change viscosity
- · Single broken line will disable complete system.
INJECTOR SYSTEM
- · Can be used with oil and light greases,, usually limited to NLGI 1.
- · Working principle: Quickly pressurized main system line so that the lubricant on the discharge end of a spool can be injected into a bearing.
- · Pump capacity usually sized four times higher than the system’s requirement.
- · Easy system to design
- · Additional lubrication point can be added without disrupting original design.
- · Broken line before any injector will disable complete system
SERIES PROGRESSIVE SYSTEM
- · Can operate with either oil or grease (suggested minimum viscosity 100 SUS, maximum NLGI 2)
- · Provide positive displacement of lubricant by supplying each bearing with predetermined amount of lubricant before lubricating the next point.
- · Main characteristic, system will disable when a line become plugged.
- · Tamper resistant
- · Complex design, expensive, require comprehensive engineering study & required high skilled maintenance personnel
- · Additional point require re-design system
- · Competitive system to series progressive, but can’t detect blocked line very well.
- · Best choice to handle heavier lubricant for short runs.
- · Much more tolerant of contaminant in the system as the feeder not easily blocked.
- · Suitable for used in mining and steel mill application because the system proven successful in hostile environment.
- · Working principle: Used two line running in parallel to deliver lubricant, pump supply flow at one line at a time, go to lubrication point then redirected to second line.
- · Costly to install but advantageous in extremely long runs over several hundred feet in length.
DUOLINE SYSTEM
- · Innovative system which combine series-progressive and twin line system.
- · This system extend for hundreds of feet the benefit of the series progressive system along the benefit of two lines.
- · First used by Ford Motor Company in Europe (1970s) and then widely accepted in United States in short time.
- · The system can be used with oil or grease and very reliable.
- · Minimum oil viscosity is 100 SUS and maximum grease viscosity NLGI 2.
PUMP-TO-POINT SYSTEM
- · Simple system and easy to design
- · Operates with a series of pumps that usually are driven off an eccentric cam that is powered by an electric motor
- · Number of lubrication point limited by the number of pumps that can fit onto the eccentric cams
- · Not suitable for location far from pump location and many lubricating point – expensive. Suitable for small, simple machine with under 12 lubricating point.
- · Most system restricted to use oil as a lubricant
ZONE-CONTROL SYSTEM
- · A system design for flexible machining centers.
- · It is a series progressive system that utilizes a series of zero-leak solenoid valves that can be turned on to lubricate a particular station or cell of the machine.
- · System can be configured to change the frequency of lubrication
- · Can be used for oil or grease
- · Minimum oil viscosity is 100 SUS and maximum grease viscosity is NLGI 1.
EJECTION SYSTEM
- Single and multipoint ejection system ejects lubricant into the wear point or onto the wear surface such as:
- · Chain conveyor links and bearings
- · Roller chains
- · Slides and guides
- · Mold car conveyors and drives
- · Open gears
No comments:
Post a Comment