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| The latest information on hydraulic and
pneumatic motion control.
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August 18, 2009
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Ask the expert
Our goal at Hydraulics & Pneumatics is to be your one and
only stop for all things fluid power-related. To that end, we welcome
Jim Kummer's blog, Hydraulic Talk, as a featured link on our
website. Kummer is a fluid power consultant who provides answers and
assistance on hydraulic issues, so we invite you to pose your hydraulic
design questions to him when you're in need.
In the meantime, enjoy two featured articles from our August issue on
mining, a refresher course in pumps, and a technical article on
right-sizing pneumatic systems.
- Mary C. Gannon
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Electrohydraulics saves energy in excavator
Doosan Infracore, Seoul, South Korea, began manufacturing excavators
in 1977 and has incorporated additional benefits with each new model
introduced since then. Doosan’s DX180LC is no exception. Like its
predecessors, the DX180LC relies heavily on hydraulics for propulsion,
turret swing, and multiple-axis boom. However, the excavator ties in
sophisticated elecrohydraulic control with equally sophisticated
electronic engine control. This allows the machine to match engine power
with hydraulic demands, ultimately resulting in high productivity and
fuel economy. Upgrades to ergonomics and machine reliability, coupled
with less-demanding regularly scheduled maintenance all add up to higher
productivity and efficiency for the DX180LC.
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Web Exclusive — Whole-sizing pneumatic
motion systems
Too often, the flow coefficient CV is used to size a valve without
giving consideration to the other components in a pneumatic circuit. In
the past, a focus on the valve alone often sufficed because the cost of
air was considered “free” and designers tended to significantly
oversize the valve. Today’s emphasis on better energy management and
optimized performance requires a more-exacting method to properly size
pneumatic motion systems.
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Give the mine a brake
Equipment design is a process usually driven by a problem or need
that requires a solution. End users who encounter issues on the job may
report their experiences to an equipment distributor. The distributor
shares the feedback with the OEM, who then begins working on a solution,
perhaps with the help of a component manufacturer. Occasionally the
problem that starts this chain of communication is a flawed product. But
far more often it’s just about finding a more efficient and productive
way to get work done.
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Pump it up with fluid power basics
Fluid power consultant Bud Trinkel gives readers a refresher course
in pump design and use in "Chapter 8: Pumps and Accessories" of his
fluid power eBook Fluid Power Basics. This chapter covers
everything from pneumatic pumps all the way to descriptions of the most
common hydraulic pumps available in the industry today
— fixed-displacement pumps, variable-displacement pumps, and more.
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Hydraulic motor controller
HGC-2 generator controller from High Country Tek Inc. controls a
generator driven by a hydraulic motor where speed is controlled by a
proportional solenoid valve, either directly at the motor or as part of
the pump compensator. The closed-loop design aids in monitoring the ac
line voltage from the generator output for outer loop closure and
provides the necessary current to a valve coil in order to maintain the
desired generator frequency. The unit has enough processing power and
functionality when operating as a single control module to support a
wide range of hydraulic generator applications.
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Pressure gauge
PTS series pressure gauge from Winters Instruments is designed to be
used with tube fitting applications. It is available in high
temperature ranges up to and including 5000 psi, in both bottom and back
connections. It can be used with most double ferrule tube fittings and
allows for installation where space is limited or where a Teflon-free
connection is required. Due to its ¼ tube stub connection, it
allows for 360° orientation so that pressure reading can be made
easily accessible.
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Solenoid valve connectors
Series 5000 solenoid valve connectors from Canfield Connector are
protective enclosures for electrical connection in conjunction with
hydraulic and pneumatic solenoid valves. Available in mini, ISO, and
sub-micro, their modular design can be used where rapid installation and
service are required. ISO and 8-mm sub-micro connectors connect valves
using DIN 43650/ISO 4400, EN175301-803:2000 specification and the mini
and 9.4-mm sub-micro connectors are industry standards.
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Check Out the New EET Website
Are you looking for more information on energy efficiency? EETweb.com
features the latest efficiency updates, information on the basics of
energy efficiency and products available for energy efficient designs.
Click here to
visit the site and learn more!
Machine Design Video Spotlight
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Learn more about Proto
Labs |
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See how Proto Labs, through its First
Cut and Protomold services, provides new product designers and engineers
with the easiest, fastest and least-expensive way to obtain real parts,
really fast. |
Now Available On-Demand
The Energy Efficiency Web Conference & Expo
Engineers saw and heard great educational content at the Energy
Efficiency Web Conference and Expo. If you missed the live virtual
event, don’t despair! An archive of the full day’s agenda is now
available.
Design engineers are required to integrate energy efficiency into their
designs while maintaining lower costs, the highest reliability or both.
The editors of Machine Design understand these challenges
and have developed this conference to help engineers understand the
recently imposed energy mandates. The information presented at this
educational event will help engineers compare the different technologies
and product related to energy efficiency. Attendees will gain access to
the technical information needed to help them make the best decisions
without having to travel or take time away from current projects.
Visit the archive to:
- View informative webinars on energy efficiency
- Visit interactive booths where you can contact suppliers
- Peruse the Resource Center where you can download or link to
additional pertinent energy efficiency information
Register Now!
ARCHIVED WEBCASTS AVAILABLE FOR FREE VIEWING
Click
Here for a list of archived Machine Design webcasts.
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ROBUST HYDRAULIC CONTROL CONSTRUCTION EQUIPMENT
HAWE proportional spool valves are sensitive yet powerful and suitable
for the harshest of environments. Design safer, cleaner and more
efficient hydraulic system. (704) 509-1599, www.hawehydraulics.com, sales@hawehydraulics.com
SmartActuator series saves time, space, money
Tolomatic's SmartActuator is a controller, drive and motor integrated
into one compact and durable rod-style actuator. You get
cost-effective, 100% duty-cycle performance with fewer, cleaner
components.
See
the video!
Exlar's patented actuator technology offers many times the
life of ball screw actuators and provides an efficient
electro-mechanical replacement for hydraulic or pneumatic cylinders.
These digitally controlled products
offer several advantages over other technologies.
www.exlar.com
Pneumatic cylinders
Air cylinders are available in heavy-duty brass or stainless steel in
bore sizes to 3 in. They are corrosion resistant and operate for
millions of production cycles. Online configurator offers CAD models in
2D and 3D for easier ordering.
www.clippard.com/cylinders/
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Contact Information
Editorial questions: Mary Gannon
216-931-9498
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216-931-9893
Machine Design
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