Grab Type Ship Unloader Cost Effective Continuous Ship Unloader
Bulk Material Handling Ship Unloader
Mechanical (electric) differential bridge-type ship unloader is a
suite of effective, reliable and high performance unloading
appliances customized to the port and terminal business handling
dry bulk cargoes.
Mechanical (electric) differential bridge-type ship unloader is
most advanced and widely used today. Its hoisting system, opening
system and drawing system, are controlled by four drums. It was
particularly designed for specializing in professional bulk
handling solutions that provide very highest levels of performance.
The driving method of traveling mechanism is multi drive. Traveling
mechanism is composed of driving device, traveling support device
and safety protection device. The traveling support device adopts
the wheel group with balance beam, the wheel adopts the rolling
bearing wheel with double wheel edges, and the number of driving
wheels shall not be less than 50% of the total number of wheels.
Most of the driving unit are three in one reducers, which can also
be combined by reducers, brakes and motors through couplings
All the ship unloaders are designed based on our client`s technical
specifications and applications, so the technical discussion
meeting is essential before the project proposal stage.
| model | Self-propelled trolley | Main and auxiliary trolley | Mechanical differential | Electric differential |
| weight(%) | 100% | 80% | 60~65% | 60% |
| stability | 1.4 | 1.5 | 1.7~1.8 | 1.7~1.8 |
| Wire rope lengtg | 1 | 6 | 2.5 | 2.5 |
| Power consumption | 1 | 2.5 | 1.1 | 1.2 |
| Operating cost(%) | 100% | 95% | 90% | 90% |
| Fault and maintenance | Breakdown rate high and hard to maintain | Breakdown rate low and easy to maintain but wire rope system is
complicated | Wire rope system is simple, easy to change gear reducer is specific
design,hard to maintain and change | Wire rope system is simple,gear reducer is standard,easy to maintain,electrical system is complicated |
| Cost of fundamental and facilities(%) | 100% | 95% | 85% | 85% |
| model | Mechanical differential | Electric differential |
| weight(t) | 1100 | 1050 |
Rail distance(m) Wheel distance(m) | 18~28 18 | 18~28 18 |
No of wheel Wheel pressure T Driver KW | 40 50 7.5*10 | 40 50 7.5*10 |
| Luffing mechanism KW | 90~110 | 90~110 |
| Four drums mechanism KW | Start 2X500KW Runing 315KW | 4*400 |
Main structure of bridge-type grab ship unloader
Mechanism of bridge-type grab ship unloader
1.Traveling mechanism
The driving method of traveling mechanism is multi drive. Traveling
mechanism is composed of driving device, traveling support device
and safety protection device. The traveling support device adopts
the wheel group with balance beam, the wheel adopts the rolling
bearing wheel with double wheel edges, and the number of driving
wheels shall not be less than 50% of the total number of wheels.
Most of the driving unit are three in one reducers, which can also
be combined by reducers, brakes and motors through couplings
2. Main structure of bridge-type ship unloader
The connection of the main steel structure of the ship unloader
adopts rigid connection, and the rigidity of the whole machine is
strong enough.
Rolling T-section steel is adopted for the front and rear girder of
the ship unloader and the trolley rail beam without fillet weld, to
avoid weld fatigue cracking that may occur when the trolley wheels
are rolled back and forth.
3. Hopper system
The hopper unloading system of the ship unloader is composed of
coal hopper, feeder, fork hopper, coal spreading baffle,
windshield, two way chute and buffer bracket.
4. Grab bucket hoisting mechanism(mechanical differential four
drums)
The traveling of the mechanical differential grab ship unloader
trolley depends on a driving motor to connect the two differential
reducers through the a coupling. Through the differential
transformation of the gearbox, the grab lifting is transformed into
the transverse movement of the trolley.
5.Grab bucket(wire rope reeving system)
6. Luffing mechanism
The luffing mechanism of bridge-type grab ship unloader is composed
of motor, brake, reducer, drum and safety brake.
7.Wire rope reeving system of luffing mechanism
8. Cantilever safety hook device
When the cantilever of the ship unloader is luffing to 80 °, the
safety hook device is used to hang the cantilever and loosen the
steel wire rope at the same time. The safety hook is usually driven
by hydraulic cylinder or electro-hydraulic actuator.
9.Wire rope reeving system of wire rope support trolley
Overview of production process
Photos of our factory
