The conditions inside a coal pulveriser can be very harsh, with coal dust and vibrations placing a large amount of strain on materials.
It is this strain that can wear down the resistance of both materials and machinery.
According to ContiTech Air Spring Systems, their air actuators are able to last much longer than hydraulic powered steel cylinders as they are more resistant to the conditions inside a coal pulveriser.
“The steel cylinders can not stand up to the coal dust and the oily environment for longer than three months,” the company said.
“Nitrogen-operated air actuators used in coal pulverisers, on the other hand, have proven themselves under adverse conditions.”
Air actuators are dimensionally stable elements made of elastomer materials with vulcanised textile tensile
The reason for their ability to withstand the wear of the coal pulveriser is that air actuators are designed to function maintenance and oil-free and without sliding gaskets.
Essentially, ContiTech says that the fewer moving parts, the fewer instances of wear.
“As they function without mechanically moving parts, the air actuators are wear and maintenance free,” the company said.
“Dirt, dust, granulated material and sludge cannot damage the air actuator, and it is also completely resistant to many chemicals.”
While ContiTech produces many air actuator designs, they can be split into two basic variants: convolution air springs and rolling lobe air springs.
Single, double and triple convolution air springs have a very low minimum height and low return forces.
Compared to convolution air springs, rolling lobe air springs have a smaller diameter but the same maximum force, and emit an almost constant level of force via the stroke.
With air actuators designed for pneumatic functions, the movement is generated by the bending of a highly flexible shell which according to the company, means the usual piston rods and the guiding and sealing elements are not required
Standard actuators are designed for temperatures from -30°C to 70°C and there are also designs for much hotter or cooler operating conditions, ranging from -60°C to 130°C peak temperature, ContiTech said.
• ContiTech Air Spring Systems
02 8901 0553