Industrial and Agricultural
Firestone Airstroke™ actuators
Firestone Airstroke™ Actuators have long been used in the industrial market as pneumatic actuators incorporated into new and innovative machinery designs as well as replacement actuators for traditional pneumatic or hydraulic cylinders. They have advantages over traditional cylinders in that they are durable, operate well in corrosive and abrasive environments, easily accept misalignment and have a high ratio of stroke to collapsed height.
Why use Firestone Actuators(rather than air or hydraulic cylinder) for Actuation?
- Low Cost – Generally, initial cost is one-half or less than conventional pneumatic or hydraulic cylinders of the same force capabilities.
This initial cost advantage is many times greater in the larger sizes.
- Wide Size Range – Airstroke actuators are available in sizes ranging from 2.2 inches (56mm) to 37 inches (940mm) in diameter.
The force capability is 100,000 pounds (45 Tons). Strokes of up to 14 inches (360mm) are possible.
- Durable For Lonf Life – Airstroke actuators are a further application of Firestone’s time proven Airide springs for truck and bus suspensions. The long life
and durability necessary for millions of miles of heavy duty suspension use under adverse environmental conditions are also important factors in machine design.
- No Maintenance or Lubrication Required
- No Internal Rod or Piston – Airstroke actuators have no internal rod, piston or sliding seals as do conventional cylinders. This allows for the design of Airstroke actuators into
applications where dirt or grit would destroy the seals on conventional cylinders.
- Friction Free for Immediate Response – Since Airstroke actuators have no sliding seals, there is no breakaway friction as with conventional cylinders.
- Flexible Media – An Airstroke actuator can do its work either a liquid or gas (Please see page 14 in our catalogue for acceptable media choices.)
- Angular Capability – An Airstroke possesses the unique capability of stroking through an arc without clevis. Angular motion of up to 30 degrees is possible, along with
the design advantage of generally less complex linkages.
- Side Loading Capability – Airstroke actuators, within certain limits, are not affected by side loads as are conventional cylinders. This misalignment capability eliminates
potential rod bending, scoring, and excessive seal wear common to conventional cylinders.
- Compact Starting Height – Airstroke actuators have a low profile compared to conventional cylinders. Our smallest Airstroke axtuator (2.2 inch/dia.=56mm)
collapses to just 1.1 inches in height, while our largest triple convolted Airstroke (37 inch/dia.=940mm) will collapse to a very compact 5.5 inches = 140mm.
- Factory Sealed and Tested – Most Airstroke actuators feature Firestone’s proven concept of crimped end plates. The crimped design allows
for pre shipment testing and quicker installation on equipment.
Isolate-to separate, set or keep apart. Firestone Airmount™ Isolators do just that, providing the highest degree of vibration isolation of any isolator on the market. Firestone Airmount Isolators are versatile and not only work to isolate delicate objects from external vibrations, but are able to support vibrating loads and prevent its energy from disturbing the surroundings. Airmount Isolators reduce structural noise, are available in a wide range of sizes, and extend equipment life through their superior isolation capabilities. Airmount Isolators-a great alternative to conventional coil springs and other types of isolators.
Industrial Isolator Applications – Marsh Mellow
Marsh Mellow is the trade name of fabric and rubber spring developed by Firestone Industrial Products in the early 1970’s. Rubber springs have long been a subject of interest
in the vehicular suspension and industrial application fields because of their reliability, corrosion resistance, low cost, and basic simplicity. The concept has been tried with varying
degrees of success over the years. The major obstacle to solid rubber springs has been that to obtain the load requirements for many applications, solid rubber springs were either
phsically too large, or became unstable laterally when they were made long enough to provide good isolation.
The concept of “Stacking” rubber springs answered the latter problem, but introduced the need for complicated mechanical guide systems to control the lateral movement. The Marsh Mellow
fabric and rubber spring solves this basic problem and provides a new and unique way to make use of many advantages of rubber as an isolator. The basic construction of the Marsh Mellow spring
includes a solid rubber core awith a hollow centre, and fabric reinforced body. The controllable variables of this construction are the jeys to the extreme design flexibility
that the spring offers.
Advantages of Firestone Marsh Mellow Springs
- Constant Vibration Isolation with Changing Loads – The variable spring rate allows for a nearly constant natural frequency with changing loads. This results in consistent vibration
isolation with variable loading.
- High Load Carrying Capacity – Due to the Marsh Mellow spring’s greater deflection capabilities and load carrying influences of the fabric reinforcement, it can carry a greater load
when compared to an all rubber part of the same modulas and dimensions.
- Excellent Vibration Isolation – Low natural frequencies provide excellent isolation of forced frequencies in the range of 800-1200 cycles per minute (13-20Hz).
- Lateral Vibration Isolation – The lateral spring rate of a Marsh Mellow spring can be less than the vertical spring rate, resulting in a lower lateral natural frequency.
Marsh Mellow springs provide better vibration isolation in all degrees of freedom.
- Compact Overall Size – The ability to support greater loads and maintain a cylindrical shape results in a smaller overall size of the Marsh Mellow spring compared to an all rubber
spring with identical load capacity. This is important when considering an application with a small design envelope.
- Corrosion Resistant for a Durable, Long Life – Due to its rubber and fabric reinforced construction, the Marsh Mellow spring has been proven on the damp and corrosive environments of
mines and mills where a standard coil spring will fail.
- Does Not Bottom-Out – Due to the rubber construction, Marsh Mellow springs do not bottom-out like coil springs. Bottoming-out under overload or surge load sends a large amount of
stress to all of the machine’s components.
- Eliminates Downtime and Potential Damage to Machinery – When a coil spring fails, it will often crack allowing fragments of the coil to damage equipment. This problem is eliminated
with the rubber construction of Marsh Mellow springs. Additionally, Marsh Mellow springs exhibit exceptionally high overload characteritics and usually do not fail catastrophically,
offering some support even during failure.