What Should You Pay Attention To When Choosing The Right Rodless Cylinder Type?
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Choose the right Rodless Cylinder type. First, you need to know what equipment the cylinder will be installed in. Most cylinder equipment is used in the manufacturing industry. There are basically two types of cylinders used in the manufacturing industry, namely tie rod cylinders and welded cylinders. Tie rod cylinders use high-strength threaded steel tie rods on the outside of the cylinder housing to increase strength and stability. This is a very common type of cylinder in the manufacturing industry. They are widely used in CNC machine tools and automated manipulators.
Welded or rolled cylinders have a heavy-duty housing with a barrel that is welded or bolted directly to the end cover, and no tie rods are required. They are designed for pressures of 5,000 psi or more and are generally more suitable for more rugged applications such as presses, steel mills, and offshore environments with harsh environments and wide temperature fluctuations.
Cylinders are usually customized. Cylinder standards specify dimensions, pressure ratings, mounting types, etc. However, there are some special cylinder models that engineers designing custom machinery need to deviate from the standard through special mounting, port size or configuration to suit specific applications.
Considerations for selecting cylinder size
1. The diameter of the cylinder piston rod is critical. Perhaps the most common mistake in cylinder design is undersizing the piston rod, making the cylinder more susceptible to stress, wear, and failure. Piston rod diameters can range from 0.5 inches to over 20 inches, but they must be sized appropriately for the available load. In push applications, it is important to properly size the rod diameter based on Euler calculations to avoid buckling or bending of the rod. The size of the cylinder piston rod is always the first consideration when designing a cylinder to produce the required force.
2. Prevent rod bending. In a long-stroke cylinder, a fully extended rod can bend under its own weight. Excessive bending can cause wear and damage to seals and bearings. It can even cause the piston to cock in the bore, scratching and damaging the inner surface of the cylinder. Rod deflection should not exceed 1 to 2 millimeters. Cylinder rods at risk of bending or misalignment require additional support. Depending on the stroke length, a stop tube may be required; this increases the bearing area of the cylinder to prevent excessive wear. Engineers may also consider using a larger diameter rod to increase strength. But this also adds weight and can backfire, so calculate carefully.
3. We also need to pay attention to the shock load of the cylinder when selecting the right size. The stroke length, that is, the distance required to push or pull the load, can range from less than an inch to several feet or more. But when the cylinder extends or retracts, it is important to ensure that the piston does not bottom out and generate shock loads at the end of the stroke. Engineers have several options: add internal cushions to decelerate the load near the end of the stroke; add an external mechanical stop to prevent the cylinder from bottoming out; or use proportional valve technology to accurately meter the flow and safely decelerate the load.
