Handling Machining Assembly Organisation Pneumatics Electronics Mechanics Sensorics phần 7 potx

72 99 Examples of pneumatic applications

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Balancers are hand-guided lifting devices which can be used to hold suspended

loads against the force of gravity. This avoids the need for severe physical effort.

The motions of balancers are not pre-programmed. The required compensating

force is generated pneumatically, usually with the aid of a cylinder. In future,

Fluidic Muscle will also be used, giving lower weight and more dynamic opera￾tion. The balancer circuit in the illustration is designed for a single load. There

are also circuits that allow a selection of several preset loads. In order to make

it possible to handle any desired weights (within the safe working limit) in any

desired order, a weighing device must be installed between the load carrier and

the lifting device. The resulting weight value is then used to control the pneu￾matic “counter-holding force”. Balancers have become very common in recent

years.

Suitable components:

Standard cylinder DNG... or DNC...

Pneumatic single pilot valve...

Proximity switch SM...

One-way flow control valve GRLA...

Pressure regulator LRMA...

Non-return valve H...

OR gate OS...

Mounting accessories

Fittings

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Lifting

Balancer load lifting device

1 Roller arm

2 Roller

3 Lifting unit

4 Cable, chain, belt or strap

5Mechanically or pneu￾matically-driven gripper

device

6 Pneumatic piloting

7 Auxiliary air regulator