Tech Briefs Magazine - August 2021 - MD-9

SUPPLY
R P S
A B
SOL01
valve VLV05. The air supplied through
VLV05 causes the cylinder to extend and
retract (cycle) in a similar fashion to the
double-acting cylinder in Figure 3. To
control the cycle speed of the cylinder,
flow control valves are used to adjust the
flow of air exiting the cylinder.
As cylinder CLY03 extends, it physically
operates the 3-way, 2-position spring
returned valve VLV07. This valve supplies
pilot air to VLV05. The pilot air
switches the position of VLV05's spool,
which reverses the direction of CYL03,
retracting it. With the cylinder retracted,
VLV08 is actuated, supplying pilot air to
the other side of VLV05, causing the
cylinder to reverse direction and extend.
The cycle repeats until SOL06 is deenergized.
Once de-energized, the cycle
ends once the cylinder retracts.
  
CYL01
Then stop using complicated controllers for precision motion.
You shouldn't need a Ph.D. in control systems to program your
controller.
Figure 3. Double-acting cylinder circuit diagram.
These circuits are some of the most common devices
on PLC-controlled machines.
closes, forcing air through the adjustable
flow section of the device. These adjustments
can be used to throttle the cylinder
retract speed. The flow-controlled air
then flows through port B of the valve,
then through a muffler at port S.
Typically, a valve such as SOL01 is
energized by a 24 VDC PLC output. This
switches the valve, supplying pressure out
port B. Similarly to the normal resting
state flow, this air flows freely through
the flow control to the extend side of the
cylinder, extending the cylinder rod and
plunger to the left. The air on the left
side of the cylinder is forced out through
the flow control. As the air exits to port A
of the valve, the flow can be controlled.
The air then flows through port A to port
R, where a muffler is installed to reduce
the exhaust noise.
Continuous Cycling Cylinder
Circuit
With no external control required,
Figure 4 provides a circuit example of
how pneumatic components alone can
be combined in a well-thought-out
design to automatically cycle by simply
supplying compressed air to valves
VLV05, VLV07, and VLV08.
With compressed air supplied, when
solenoid SOL06 is energized with CYL03
physically retracted, the system will start
cycling, extending, and retracting cylinder
CYL03. In this condition, supply air
flows through VLV08 and SOL06, then
provides pilot air to directional control
Motion Design, August 2021
Cov
ToC
   
  
AT0520A-CSG
With Automation1, you
can now reduce your set
up time - in many cases,
from days down to minutes
- thanks to an intuitive
interface and machine
setup wizard. Automation1
is the most user-friendly
precision motion control
platform available.
Free Info at http://info.hotims.com/79416-705
9
http://info.hotims.com/79416-705 http://www.abpi.net/ntbpdfclicks/l.php?202108MDNAV
Tech Briefs Magazine - August 2021

Table of Contents for the Digital Edition of Tech Briefs Magazine - August 2021
