00195193-02 SG D4 FSE en (1).pdf - 第144页
Services to the machine Overview Pneumatic System Pneumatic System Student Guide SIPLACE D4 (FSE) EN 09/2006 Services to the machine 137 6.3.2 Overview Pneumatic System 6.3 - 1: Pneumatic overview
Services to the machine
Pneumatic System Vacuum Generation at C&P Heads - General Information
Student Guide SIPLACE D4 (FSE)
Services to the machine EN 09/2006
136
6.3 Pneumatic System
6.3.1 Vacuum Generation at C&P Heads - General Information
The air is supplied to the vacuum generator, which produces a vacuum using the venturi principle.
The venturi block actually consists of 2 separate venturi nozzles which produce vacuum for 2 circuits,
the holding circuit and the pick up / placement circuit.
The level of vacuum produced is dependent on a number of factors. The greatest influence on vacuum
generation is from the Venturi unit. Any leakage from or blockage within the system will result in working
inefficiently and therefore a reduction in the vacuum levels created. The Venturi unit must be absolutely
airtight and the nozzles in very good condition and of high quality.
One factor which can impair vacuum generation is the altitude. The higher above sea level a machine is
located, the low the ambient pressure will be in the room surrounding it. Therefore at high altitude low
vacuum levels are created, A SIPLACE machine in Munich, at an altitude of 500 m above sea level, can
generate a closed vacuum of approx. 870 mbar, while a machine at sea level in England would be able
to produce approx. 920 mbar.
Another factor influencing the vacuum values is the weather. Stormy, rainy days occur in periods of low
pressure. Vacuum generation during this weather may produce 880 mbar, while the same procedure a
week later, on a sunny day in a high pressure period, could well produce closed vacuum results of 900
mbar.
These 2 cases are only examples and no specific case / figures are used, but this just illustrateswhat
can happen. In any case, it is important that you use an efficient, high quality vacuum system.
The vacuum measurement board is located directly above the vacuum generator and measures the
vacuum values in the hold and pickup/placement circuits. Small tubes are attached to the back of the
Collect & Place head that measure the circuit pressures at the vacuum distributor. These tubes are
connected to pressure sensors. The analogue outputs of these sensors are supplied to A/D converters.
The resulting signals are then sent via the CAN-Bus to the machine controller.
Services to the machine
Overview Pneumatic System Pneumatic System
Student Guide SIPLACE D4 (FSE)
EN 09/2006 Services to the machine
137
6.3.2 Overview Pneumatic System
6.3 - 1: Pneumatic overview
Services to the machine
Pneumatic System Pneumatic unit
Student Guide SIPLACE D4 (FSE)
Services to the machine EN 09/2006
138
6.3.3 Pneumatic unit
The pneumatic unit is a fixed installation inside the machine. The unit is accessible via a door and
contains the complete compressed air supply for all consumer devices.
The compressed air supplied (5 – 10 bar) is shown on the manometer for the incoming pressure and
flows through the filter to the proportional valve. The proportional valve regulates the compressed air for
all consuming devices to a consistent pressure of 5.0 bar:
C&P head (input vacuum generator for head min. 4.5 +0.1 gantry 1 - 4)
Compressed air CO table for locations 1 - 4 (docking and undocking)
Compressed air for nozzle changer
Safety valve for compressed air supply to conveyor (driver for width adjustment and lifting table)
Safety valve for compressed air supply to cutters (locations 1 - 4)
Adjustment valve for manual adjustment of bulkcase feeder air pressure, reduced to 2.5 +-0.5 bar
Legend
1. Main compressed air connection with shutoff
valve and manometer
2. 4x connection for bulkcase feeder with
manometer, adjustable (2.5 bar), location 1-4
3. 4x connection for cutters, location 1 - 4
(4.5 bar)
2x connection for conveyor lifting table
4. 4x Connection for nozzle changer (4.5 bar)
5. 4x connection for docking/undocking CO table
(4.5 bar)
6. Electronic control valve for incoming pressure
5.0 bar.
7. 4x connection for gantries 1 - 4, vacuum
generation C&P head with shutoff valves
8. Compressed air filter