Electric short-stroke cylinder ADNE-LAS
Many systems require short but dynamic movements between two end positions. For example on a testing machine where components tested as "bad" have to be removed from the continuous manufacturing process. That is why Festo has integrated a linear motor into a short-stroke cylinder, which can be positioned between two end positions through force control.
The short-stroke cylinder ADNE-LAS is operated in the simplest way possible. It is force-controlled from end stop to end stop like a pneumatic cylinder. In contrast to pneumatic cylinders, though, monitoring functions are integrated through the electronics and the simple feedback of errors is guaranteed.
The current position of the piston rod is monitored via the linear motor coils using Festo patented technology, and an "In-position" signal is transmitted when the piston rod is within the positioning window. If the drive does not reach the end position because of an external blockage, an error is emitted and the drive is shut down. The temperature of the axis and the drive electronics is constantly monitored to guarantee reliable operation. In order to achieve the highest possible flexibility when selecting the positions, the end positions can be taught-in via external end stops. Using the end-position controller CMFL a total of four different movement patterns are possible between the two end positions:
3. Advance and retract again
4. Retract and advance again
These movement patterns can simply be selected via inputs and started using the start signal. The standard ISO 21287 was created in order to harmonise the mechanical interfaces on pneumatic cylinders. Based on this standard, Festo introduced the pneumatic cylinder range ADN. The electric short-stroke cylinder ADNE-LAS is based on ISO 21287 so that the many accessories of the pneumatic cylinder can also be used on this and other linear motor axes. Festo has thus become a provider not only of pneumatic compact cylinders, but also of electric compact cylinders. However, when selecting a drive, please remember that electric drives may not achieve the same power density as pneumatic drives of the same size. This electric short-stroke cylinder can reach movement frequencies of up to 14 Hz in a short space of time. This is ideal for applications where extremely quick reactions are a must. In pneumatics, a solenoid valve requires a switching time of approx. 10 ms; in addition, the pressure build-up in the pneumatic cylinder requires 20 to 40 ms. This means that a pneumatic cylinder does not start to move until after 30 to 50 ms. In this time, a linear motor has already finished its movement, thus offering substantial potential for increasing the output of machines. Commissioning the linear motor system ADNE-LAS is extremely simple: wire it, switch it on, teach it and off you go! This is a perfect example of the plug & work principle. Users have to mechanically and electrically assemble the system and do not need to adjust any parameters. Since the CMFL has both optimisation and position control already built in for the ADNE-LAS, the operator only needs to provide information during the teach-in process; this is stored in the controller until it is re-taught. As the short-stroke cylinder with linear motor ANDE-LAS and the end-position controller CMFL are in protection class IP65, they can be used in a wide range of applications.
- Switching deflectors
- Outward transfer of products tested as "bad"
- Affixing labels • Testing pushbuttons
- Blocking movements