Electric cylinders are relatively inexpensive and easy to program. New options are also shortening design cycles. Improvements in dynamic response, force, and environmental parameters let electric cylinders fit applications previously dominated by leak-prone hydraulic and pneumatic linear actuators. Electric cylinders are easy to install, offer longer service life and higher accuracy, and work effectively in a wide variety of sophisticated control systems. Fast, powerful, and reliable electric cylinders consist of electric motors, belts, and leadscrews that are matched for optimum performance. Electric cylinders come in a variety of load and speed ratings, lengths, motor types, and load attachments. Their modular design lets them fit a wide range of machines. Internal construction of a belt-drive electric cylinder Electric cylinders are often used in simple bang-bang motion control systems where limit switches placed at each end of travel comprise the simplest type of control. Analog control systems employ a feedback sensor to determine the actual position of the load. This more accurate, absolute closed-loop positioning system easily interfaces with a variety of sensors, PLCs, and PCs. Speed-thrust curves help select a best-fit electric cylinder. Motion-control systems that require linear movement can be built around a variety of different actuators. The most common types fall into linear actuators, linear motors, and precision positioning tables. Linear actuators, generally the lowest cost approach, can be hydraulic, pneumatic, or electromechanical. Each comes with advantages and drawbacks, so their use depends on the specific application. Hydraulic cylinders, for example, can handle high loads and generate forces up to several tons. But they're not so good at accurate load positioning. This task requires relatively expensive position sensors and electrohydraulic servovalve controls. Hydraulic systems also tend to leak which contaminates the work area. By comparison, pneumatic cylinders are primarily used when light loads must be repeatedly moved between fixed positions.
Products & Services
Cylinder Repair Services
Cylinder repair services rebuild and refurbish used or damaged cylinders. They disassemble and clean cylinders, inspect them for cracks and other damage, and re-hone cylinder surfaces.
Electrohydraulic cylinders are actuation devices that use pressurized hydraulic fluid to produce linear motion and force. A hydraulic pump is an integral part of the cylinder design.
Rodless cylinders are linear devices that use pressurized fluid to move a load within many power transfer operations.
Hydraulic Repair Services
Hydraulic repair services rebuild, repair and calibrate used hydraulic components and equipment such as hydraulic pumps, valves and servo valves, cylinders, motors, jacks, rams, actuators, hydraulic power units (HPUs) and hydraulic machines or systems.
Electric linear actuators have an output rod that provides linear motion via a motor driven ball screw, lead screw, or ACME screw assembly. The actuator's load is attached to the end of a screw or rod and is often unsupported.
Topics of Interest
After reading this chapter, the student will be able to:
Explain the construction and design features of hydraulic cylinders
Describe in detail the operating principles of...
Servosystems are often an economical alternative to pneumatic cylinders. The actuation of cams, detents, and levers has long been the forte of pneumatic or hydraulic systems in machines. These systems...
The best controllers and software can't overcome a poorly designed hydraulic system. In typical servohydraulic motion systems, the valve mounts as close as possible to the cylinder. Experts also...
The coupling of electronic and hydraulic technology is becoming increasingly common, especially in electrohydraulic actuators. Advances in transducer logic and control capabilities have resulted in...
Getting the most out of PID systems is the key to precise hydraulic motion control. High-performance hydraulic motion controllers like the Delta RMC100 often receive cylinder-position data from...