Titan VS-32-L, Operating And Maintenance Instructions Manual, Page: 24 / 51

VS-32-L
24
7.1.3. Strap feed, precise movement
The transport motor M1 then operates at reduced speed-mean speed Y1 , until the
strap stop lever (87) has been reached which actuates the limit switch B1 and
again reduces the precise movement.
Simultaneously, counter switch
B2 is activated. Switch B2 counts the pulses at
the transport shaft (385) prespecified and switches off the precise movement
during the transport of the strap after the strap overlapping has been completed.
In addition, a monitoring timer
t9 is processed for strap overlapping. The
beginning of the strap is then found in the sealing sector.
7.1.4. Closing strap gripper 1
After the number of pulses prespecified has been reached, the solenoid valve
Y5
of the sealing motor M3 is switched on, the sealing motor turns 50° and closes the
gripper (1671) . During that operation switch ring 1 (55) leaves the zero position of
the sealing unit and the limit switch B3 (zero position = casing pitch and feather
key groove same level). Then after 50°, switch ring 2 (52) occupies Pos. K at
switch B4 .
Then the beginning of the strap is secured against retraction. In most strapping
situations that position is chosen as
stand-by position . From that position the
strapping head can be moved to the packing item.
A switching slide with two
switches then sends the signal “Head before packing
item“
B7 to the control system, then, when the movement continues, it signals
"Head on packing item" B8 .
7.1.5. Transport back of strap
With switch
B8 (head on packing item) being assigned the 5/3-port control valve
Y4 is switched on for the transport back of the strap. The transport back remains
in operation until the strapping sling is around the packing item and the transport
motor
M1 has applied a pretension of approx. 1800 N to the strap.
When the motor is in operation, counter switch B2 being screwed in the motor
flange (529) scans the speed of the motor (approx. 540 1/min = 1080) over two
surfaces on the transport shaft (385) . A pulse monitoring device in the electronic
control switches off the motor when being at a standstill and starts the tensioning
operation.
After the transport back of the strap the valve air-cleaning device
Y8 is switched
on for a short time t8 = approx. 0,5 s to remove abrasive and combustion residues
from the sealing cell.
7.1.6. Tensioning the strap
When the transport motor
M1 is switched off, valve Y6 of the tensioning motor M2
and, simultaneously, the short stroke cylinder (314) of the rocker (330) over valve
Y16 are switched on. The rocker is lowered down to the strap and tensions it
around the packing item until the nominal value preset stops the tensioning motor.
The adjustable strap tension can be between 4000 and 20000 N.
It can at the
multi-functional module (569) see chapter 8.4 being adjusted. The tension
pressures achieved can be read on the pressure gauge installed.
B 13 GB 33/06