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- Structure and action analysis
for clamping unit:
- (see above picture) four
piston rods (tie rods) cross through the movable platen and their
ends are fixed on the four angles of the stationary platen and the
back stand. Four cylinders are sleeve over the piston rods and
fixed on the movable platen. Two mold-moving cylinder are
assembled between the movable platen and back stand or between the
movable platen and the front stationary platen. The mold-moving
cylinder drive the movable platen to open or close the mold, and
the high pressure clamping is fulfilled during the process that
the pressure oil is filled into four cylinder.
The four bars are stressed evenly, and the force line
is shortened by 40%, the system has a good rigidity.
the clamping force repeats precisely.
The clamping force can be controlled according to the
feedback of the injection pressure.
the position of the mold can be adapted
automatically.
High precise products can be molded, such as gear,
lens and CD.
- It is favorable for long core
products, and molding big products by a small Model machine can be
available.
- compare with the
toggled type injection molding machine, the opening stroke of our
machine is 1/3 longer and can be further extended according to the
user's requirement.
there are three position points on each of the four cylinders
enable the movable platen to conduct quite a long guide for its
smooth motion. This feature facilitates to make the long core
products.
- the longevity of the machine
and the mold can be increased by more than 50%
- There are no wear and tear in
the pin and spindle that always occur in the toggle machines.
Low pressure protection is sensitive and reliable.
the tie bars (column bars) can bear heavier pull because they are
stressed evenly and force line shortened by 40%.
the mould is stressed evenly.
The clamping force will decrease once the injection is over.
therefore, the heavy load bearing time of the machine and the mold
will be shortened by more than 3/4.
- The speed increase by 20%, energy
saving by 10%
- with 2 mold-moving cylinder
and 4 clamping cylinders, the contradiction of the force and speed
can be resolved.
- the oil circuit between the
left and right chamber of the clamping cylinders is quite short
and resistance is very low.
- the right chamber of cylinder
is compensated by the pressure oil from the left chamber of the
same cylinder. The following trouble in the traditional
liquid-filled injection molding machines can be avoided: crawling
and time-consuming in the pressure increasing process usually
occurs as a result of insufficient vacuum oil-suction.
- The time for multiplying the
oil pressure is only 1/5 of the tradiitonal fully hydraulic
injection molding machines.
- No multiplied oil refilling
will be needed to the clamping cylinders while pressure holding is
in processing.
- The action will be more
stable, more accurate and faster by four section control to the
clamping force and speed.
- Compared with the foreign
fully hydraulic machines, more than 1/3 hydraulic units have been
reduced and the energy saving of 15% is realized by an advanced
design and smart matching of the hydraulic system.
- other merits:
- no mold adjustment is needed.
- there are few wear-and-tears
in the clamping system and no lubricant is to be supplied.
- there are pnly a few stressed
parts in the clamping system. the mechanism and hydraulic systems
are quite simple. the maintenance is easy and the charges for it
can be saved a lot.
- The clamping force increase
accordingly, up to 1.5 times, with the growth of the injection
pressure during injection to ensure the mold-relieving can be
avoided.
- The export standard of the
permitted leakage volume is only 1/100 of the JIS (Japanese
industrial standard)
- There is an option of press
injection feature for multi-molding requirements.
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