Handling Machining Assembly Organisation Pneumatics Electronics Mechanics Sensorics phần 9 pps

96 99 Examples of pneumatic applications

Functional sequence

V1 V2

a b

V1

1 V2

2

3

4

5

6

2

7 8

x

y

81

Re-positioning

Tin-can transferring device

a) Schematic representation

of transfer system

b) Four-link mechanism

(plan view)

1 Conveyor beam

2 Suction cup

3 Feed conveyor belt

4 Workpiece (can)

5Outfeed conveyor belt

6 Lifting cylinder

7 Link cam

8 Articulated arm

Even in the age of electronically controlled drives, mechanical transfer devices

with a non-uniform action still have their uses, thanks to the high repetition

accuracy which they offer together with their low investment cost. The example

above shows an application in which cans are transferred in groups from one

conveyor belt to another which is running significantly slower. The cans are

picked up by their tops via suction cups, which means that it is permissible for

their other exterior surfaces to have areas of wet ink or paint. The overall device

has been designed as a dedicated solution and has only limited flexibility.

Instead of the short-stroke power cylinder, it would also be possible to use

special lifting suction cups. These are units in which a piston drives a suction

cup onto a workpiece and then lifts this once vacuum has built up under the cup.

Suitable components:

Bellows suction cup VASB...or lifting suction cup

Vacuum generator VAD... or vacuum generator with ejector pulse VAK...

Vacuum efficiency valve ISV...

Compact cylinder ADVU...

Proximity switch SM...

Mounting accessories and fittings