A broken coil spring isolator or actuator in conveyors, vibrating screens, crushers, tanks, and storage hoppers can completely shut down processes, sending maintenance personnel to undertake the heavy and dangerous task of dismantling and handing over. in service vital machinery used in industries such as bulk material handling and mineral processing.
The actuation and isolation specialist, Air Springs Supply Pty Ltd, provides silent rubber solutions to these problems with complementary products designed by Firestone Industrial to overcome both breakage and noise problems endemic to machinery. vibrant, he said.
This includes the maintenance-free solid Marsh Mellow ™ rubber and fabric-reinforced diagonal layer insulators, which provide high load capacity with constant vibration isolation through changing loads, according to Air Springs Supply. Marsh Mellows will not bottom out like coil springs and will offer low natural frequencies to provide excellent isolation (including forced frequencies in the range of 800 to 1,200 cycles per minute at 13-20 Hz), said the company.
Ruggedly Designed Bellows Air Springs Airstroke® air actuators, frictionless for immediate response, and complementary Airmount® air actuators, which do not require periodic maintenance or lubrication, offer another solution. They are available in sizes ranging from 58 to 940mm in diameter and with a force capacity of 445kN, which means they can be used for delicate tasks and conveyors, up to heavy shakers, screens and crushers, the company said.
Air Springs Supply said, “Before Marsh Mellows was developed to solve problems with metal springs – including failure, replacement, and noise – solid rubber springs were either physically too large or became sideways unstable when they were were long enough to provide good insulation.
“The concept of ‘stacked’ rubber springs addressed the latter problem, but introduced the need for complex mechanical guide systems to control lateral movement. “
The Marsh Mellow fabric and rubber spring solved that problem and provided a new way to utilize the many advantages of rubber as insulation, said James Maslin, director of sales and marketing for Air Springs Supply.
“The basic construction of the Marsh Mellow spring includes a solid rubber core with a hollow center and a fabric reinforced body,” he said. “The controllable variables of this construction are the keys to the extreme design flexibility that the Marsh Mellow spring offers. And the same springs can eliminate the potential problems of broken coil springs causing fragment damage to vibrating, stamping and metal forming equipment.
Marsh Mellow die springs can be compressed to 40% of their free height at a cycle rate of 50 cycles / min or less, the company said. Rates of up to 300 cycles / min can also be achieved.
“The high load capacity of Marsh Mellow Springs means that fewer springs may be needed in an application, resulting in a lower overall cost,” the company said. “A spring with an overall size smaller than an all-rubber spring of the same load capacity can be chosen, which is an important factor when space is at a premium.”
Airstroke pneumatic actuators and complementary Airmount isolators provide an additional alternative to metal springs, according to the company. This is because they are very strong balloons, both of which do not contain any internal moving parts that could break or wear out. The resulting lack of internal friction and the inherent rapid cycling ability make them very suitable for actuation tasks such as transport equipment and vibrating machinery, the company said.
“They are also exceptional insulators, in which Airmounts reliably achieve insulation efficiencies often exceeding 99%,” said Air Springs Supply. “Their exceptional performance makes them suitable for applications such as the suspension of vibrating screens or motors and compressors commonly found in industrial facilities, where they are typically used when the weight exceeds 100 kg per mounting point.
A common material handling isolation application is the vibration isolation of the bin. This type of vibration is typically used to maintain a homogeneous mixture or flow of material inside a hopper where it must be isolated from the bin supports to avoid structural fatigue.
Steel springs can be used, but they must be adjusted for a specific load and unique height. Air springs provide a high degree of isolation from other methods, where they are used up to disturbing frequencies of 3-4 Hz, according to the company. The inflation of the insulator can be changed to compensate for different loads or heights without compromising the effectiveness of the insulation.
The Airstrokes and Airmounts offer 40 to 40,000 kg of pushing or lifting power and strokes (extensions) up to 350 mm, powered by simple and basic compressor equipment found in almost any factory, a declared Air Springs Supply.