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bolted mill type mining cylinder

bolted mill type mining cylinder

Twelve tips for better cylinder selection

1. Choose the right cylinder type.Two basic hydraulic cylinder designs for industrial applications are tie rod and welded cylinders. Tie rod cylinders use high strength threaded steel tie rods on the outside of the cylinder housing for additional strength and stability. In the U.S., this is the most common cylinder type. Theyre used on most general industrial applications, such as plastics machinery and machine tools, although they tend to be to 3,000 psi maximum operating pressure. The cylinders are built to NFPA standards, which makes their dimensions and pressure ratings interchangeable with any other cylinder built to that standard. Welded or mill type cylindershave a heavy duty housing with a barrel welded or bolted directly to the end caps and require no tie rods. Designed for higher pressures, to 5,000 psi or greater, they are generally preferred in more rugged applications such as presses, steel mills and offshore settings with harsh environments and wide temperatur...

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For all types of cylinders, important parameters include stroke, bore diameter, rod diameter and pressure rating. 4. Piston rod diameter is critical.Perhaps the most common error in hydraulic design is underspecifying the piston rod, making a cylinder more prone to stress, wear and failure. Piston rod diameters can range from 0.5 to more thanĀ 20 in., but they must be sized for the available loads. In a push application, it is extremely important to size the rod diameter properly, based on Euler calculations, to avoid rod buckling or bending. When designing a cylinder to generate a required force, sizing the rod is always the first consideration. From there, work backward and determine bore size for the available pressure, and so on. 5. Prevent rod bending.In cylinders with long strokes, a fully extended rod can bend under its own weight. Excessive bending leads to wear and damage to seals and bearings. It could even cock the piston inside the bore, which can score and damage the inn...

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Cylinder parameters like stroke and force must match machine requirements, but that is only half the challenge. Environmental and operating demands also play a major part in determining a cylinders ultimate success. 9. Match the seals to the job.Seals are probably the most vulnerable aspect of a hydraulic system. Proper seals can reduce friction and wear and increase service life, while the wrong seal leads to downtime and maintenance headaches. It probably goes without saying, but ensure the seal material is compatible with the fluid. Most hydraulics use a form of mineral oil, and standard Buna N seals tend to work well. But applications involving synthetic fluids, such as phosphate esters, require Viton seals. Polyurethane is also incompatible with high water based fluid such as water glycol. Regardless of the fluid, keep it clean. Contamination and dirt in the fluid will damage seals. It can also score the inside of the barrel and eventually ruin the cylinder. If operating tempe...

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