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Z4 latch locks from STRACK!
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INCREASED PRODUCTION
- SAFE FUNCTION - SOLID - SIMPLE MOUNTING - WIDE RANGE OF APPLICATIONS
- The Z4 latch lock permits high opening and
closing speeds - faster moulding cycles are possible.
- The actuated plate is stopped and locked mechanically in the limit
position. It can only move back into its initial position when the
latch bar has returned into the latch housing. No additional limitstops
are required.
- Reduction of wear and higher tractive power owing to concentric
power transmission by two catches. Solid design where all parts
are hardened in wear areas.
- Easy mounting and adjustment!
- Different latch locks of the Z4 line can be combined to permit
a great variety of possible movements within the mould tool.
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The Z4 line from Strack offers latch locks with two-stage
ejecting and other latch lock units for opening the parting
line!
The Z4 line includes latch locks without delay, parallel
models with reinforced joint, latch locks with delay and
two-stage ejector sets.
- Latch lock with delay; the stripper plate is only actuated
after a predetermined opening stroke of the main parting
plane.
- Alternative installations of an extended cross-beam to
improve the bolt-on feature in special designs.
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L A T C H L O
C K W I T H O U T D E L A Y
- with a standard or extended latch bar
Principle of operation
When the injection mould is opened, the mould plate
(H1V) to be actuated is drawn along at the same time
by the stroke (S1) determined by the design until the
latch housing comes to a stop against the control plate.
In this position, the catches unlock and recess into
the cutouts in the control plate, releasing the latch
bar. Simultaneously the actuated mould plate is locked
by the latch housing, the cathes and the control plate
with stop. The main parting plane is opened by moving
the closure or ejector side further backwards by the
stroke (S2).
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L A T C H L O
C K S W I T H R E I N F O R
C E D J O I N T
- with a standard or extended latch bar
Latch locks with reinforced threaded joint and a more
stable latch housing.
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L A T C H L O
C K W I T H D E L A Y
- delay: 25, 50 or 75 mm
- with a standard or extended latch bar
Principle of operation
When the mould tool opens, the closure or ejector
side first travels backwards by "S1", i.e.
by the delay of the latch bar, until the latch bar is
stopped at the catches.
As the ejector side moves further backwards, the mould
plate to be actuated is carried along by the specified
travel "S2" until the latch housing is stopped
by the control plate. In this position the catches unlock,
enter the cutout in the control plate and thus release
the latch bar. Simultaneously, the actuated mould plate
is locked by the latch housing and the catches with
stop. Further mould parting is effected by further retraction
of the closing and ejector side by the stroke (S3).
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T W O - S T A G
E E J E C T O R S E T S
- with a standard or extended latch bar
NOTE! The
newest model Z4-19-67-8, with two extra parting
lines!
Principle of operation
When the injection mould opens, the closure side
first travels by the specified travel "S1".
At his stage the latch lock does not perform any function.
Now, as the hydraulic ejector of the moulding machine
advances the ejector rod which is connected to the ejector
set, the ejector set as well as the stripper plate move
forward synchronously by "S2" until the latch
housing is stopped at the control plate. In this position,
the catches enter the cutouts in the control plate and
release the ejector bar. At this point, the stripper
plate is locked.
The continued forward movement of ejector rod increases
the ejection stroke of ejector set to stroke end "S3"
so that the ejector pins can eject the moulding from
the stripper plate.
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T E C H N I C A L I N F O R M A T I O N -
L A T C H L O C K S Z 4
- At least two latch locks must be used.
- Latch locks with a more stable latch housing and reinforced
threaded joint can be mounted on much thinner mould plates.
- A comparision of forces and costs shows that it is often
better to use two large units instead of 4 smaller ones.
- Care must be taken to ensure that all the latch locks are
set uniformly and that the plate to be actuated is pulled
evenly, in order to avoid skewing of the plate.
- Locking function: The lock locks the catches. This prevents
uncontrolled return travel of the pulled mould plate.
- Before being unlocked by the latch bar, the locked mould
plate must be protected against unacceptably high locking
forces in stroke "S2" by the mould safety device
of the injection moulding machine.
| Recommended mould sizes,
not binding: |
Tensile force |
Locking force |
| Z4 / Z4-11 (12) |
up to 196 x 196 mm |
max. 10 kN |
max. 1 kN |
| Z4-15 / Z4-16 (17) |
up to 296 x 296 mm |
max. 30 kN |
max. 3 kN |
| Z4-2 / Z4-21 (22) |
up to 596 x 596 mm |
max. 40 kN |
max. 4 kN |
| Z4-30 |
from 596 x 596 mm |
max. 60 kN |
max. 6 kN |
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Stroke S1* |
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| Z4-1 / Z4-11 (12) |
min. 4,0 mm - max. 96 mm /
91 mm |
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| Z4-15 / Z4-16 (17) |
min. 5,5 mm - max. 121 mm
/ 116 mm |
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| Z4-2 / Z4-21 (22) |
min. 7,0 mm - max. 159 mm
/ 154 mm |
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| Z4-30 |
min. 15,0 mm - max. 264 mm |
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* longer strokes on request |
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N O T E S O N M O U N T I N G
- Mount the latch locks so that they are symmetrical,
parallel and square to the mould guide pins, using the reference
surfaces of the individual latch lock elements.
- Secure all the screws with spring washers or Z 9092 adhesive.
Preparatory work
- Match the length of the control plate and the latch
bar in accordance with the mould design and shorten, if necessary.
If the control plate and latch bar are to be shortened, the
hardened layer on the side faces must first be ground down.
- According to the type drill respectively grind fixing borings
respectively sparings in the latch bar, control plate and
steady.
- According to the type drill respectively mill fixing borings
respectively sparings for the latch bar, latch housing, as
well as the control plate including the steady in the mould
plate. For latch locks with location lugs on the latch housing
and steady, the required machining in the mould plates should
be carried out at right angles.
Mounting
1) Latch locks without
delay
Adjust the latch bar by pulling back onto the catches.
Screw in loosely. Eliminate the play on the catches by
further pulling on the latch bar. Tighten the screws and
dowel the latch bar. Use gauge blocks for fine adjustment
of stroke S1, dowel the control plate and steady. This
does not apply to steady which must be subsequently inserted
into the control plate. Check manually for correct functioning.
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2) Latch locks with reinforced
joint
See point 1.
For designs with location lugs on the latch housing and
steady, the required machining in the mould plates should
be carried out at right angles to the reference line.
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3) Latch locks with delay
See point 1.
Except that the mould separation "S2" must
first be opened by the exact delay stroke, so that the
play on the catches can be eliminated.
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4) Two-stage ejector
See point 1.
The two-stage ejector must be adjusted so that there is
absolutely no play at all, because the mouldings will
otherwise be damaged on ejection. To adjust the catches
to "no play", the ejector bar is drawn forwards. |
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