Numatics 450 Serie Manual Del Usuario página 3

3835198 6
CYLINDER WITH DYNAMIC
GB
ROD-LOCKING DEVICE
Ø 40 to 100 mm - double acting
Complying with ISO 15552
APPLICATION PRINCIPLE
The dynamic rod-locking device which is fi tted to the series 453-450 cylinders with pro-
fi led barrel or tie-rods is designed to stop and hold the rod of the cylinder under load in
the event of air pressure or power failure. The rod lock device is an elastic mechanical
device acting on brake pads. It is disengaged when pressure is applied.
THIS PRODUCT IS NOT A SAFETY COMPONENT
Advantages
Stops and holds the piston rod at any point of its stroke.
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Holds maximum allowable cylinder load without drifting.
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Locks in case of absence of air.
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Two-directional action.
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Cast iron brake pads, concentric on the rod, ensure the system's long service
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life without damaging the piston rod.
Easy to install. Compact rod-locking device with dimensions approximately
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equal to those of the standard cylinder.
Any mounting position.
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Reduced weight (light metal alloy body).
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Possibility of mounting to cylinders complying with ISO 15552 standards (longer rod,
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without front bushing).
OPERATING PRINCIPLE
NO PRESSURE: rod locked
DYNAMIC ROD LOCK DEVICE IN ABSENCE OF PRESSURE
No force is transmitted to the pneumatic piston (1). The two spring washers (3) apply an axial force to the bushing (2) which transmits it to
the star washers (4). The star washers apply a radial force to the brake pads (5) which lock the piston rod.
DYNAMIC ROD LOCK DEVICE UNDER PRESSURE
The pressure exerts a force on the pneumatic piston (1) which transmits it to the elastic washer (6). This acts as a lever and gears down
the force on the bushing (2). The bushing compresses the spring washers (3), all restraint is removed from the star washers (4) and brake
pads (5). The rod is disengaged.
DYNAMIC RESTRAINT
The cylinder must be locked only in case of need in the event of an emergency shutdown or in case of power or pressure supply
failure.
The rod-locking device can, however, be activated in every cycle as soon as the cylinder has come to a stop (hold function).
The stopping precision of the cylinder depends on:
- the cylinder's fi tting position (horizontal or vertical);
- the load being moved by the cylinder;
- the rate of speed at which the load is moved;
- the response time of the downstream pneumatically or electrically operated valves;
- the air volume and opening area between the rod lock's control valve and its supply port.
DYNAMIC LOCKING CAPACITY: Maximum load between 80 and 590 kg according to speed and cylinder diameter.
STATIC HOLDING CAPACITY: Maximum force between 1000 and 6300 N according to cylinder diameter (see overleaf).
450-453
The following options and versions cannot
be fi tted to this cylinder with rod-locking
device:
Stainless steel piston rod
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Reinforced piston rod
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High temperature version
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Barrel in glass-fi bre reinforced epoxy resin
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U and H guiding units
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UNDER PRESSURE: rod disengaged
1 - Piston
2 - Bushing
3 - Spring washers
4 - Star washers
5 - Brake pads
6 - Elastic washer
(min. 4 bar, max. 8 bar)
7
Series
492
3835198