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1000-70000 DWT 200-1000t/h Shipborne Screw Ship Unloader
  • 1000-70000 DWT 200-1000t/h Shipborne Screw Ship Unloader
  • 1000-70000 DWT 200-1000t/h Shipborne Screw Ship Unloader

1000-70000 DWT 200-1000t/h Shipborne Screw Ship Unloader

The ATXL-D spiral unloader is installed on a barge and does not occupy the dock berth. By relying on the bidirectional horizontal rotation of the rotary tower, the elevation and amplitude of the horizontal beam on the tower, and the forward and backward swing of the vertical arm, the feeder can achieve three-dimensional motion tracking of the material position for material retrieval. The material is lifted to the horizontal spiral machine by the vertical spiral machine, and the material in the ship's warehouse is automatically unloaded to the shore or other conveying systems on the ship through the discharge device.

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SHIPBORNE UNLOADER SYSTEM
Shipborne Screw Ship Unloader
200-1000 t/h · 1000-70000 DWT · self-contained vessel-mounted
200-1000t/hcapacity
1000-70000DWTvessels
0.8kWh/tenergy
80dBnoise
10mg/m³dust
PRODUCT INTRODUCTION
Overview
This shipborne screw ship unloader is permanently installed on a vessel hull, enabling self-unloading capability without reliance on shore infrastructure. Production capacity ranges from 200 to 1000 metric tons per hour based on cement bulk density of 1.2 metric tons per cubic meter. The system serves vessels from 1000 DWT to 70000 DWT, covering small coasters through Panamax bulk carriers. The articulated boom includes horizontal arm with ±135 degree slewing and 30 degree upward and 30 degree downward elevation, plus vertical screw arm with 30 degree inward and 40 degree outward swing. Energy consumption is below 0.8 kilowatt hours per ton, with dust emission controlled to 10 milligrams per cubic meter and noise limited to 80 decibels. This configuration eliminates the need for port-side unloaders, reducing terminal infrastructure costs and enabling operations at ports without unloading equipment.
CORE ADVANTAGES
Strengths
self-contained unloading eliminates dependence on shore infrastructure
capacity 200-1000 t/h matches mid-size to large vessel discharge needs
vessel range 1000-70000 DWT covers coasters to Panamax class
energy ≤0.8 kWh/t reduces operational expenditure
dust ≤10 mg/m³ meets international port environmental standards
quick deployment at any berth without shore preparation
reduces port turnaround time by up to 40 percent
shipborne screw unloader main view
shipborne screw unloader detail
TECHNICAL SPECIFICATIONS
production capacity200-1000 t/h
applicable ship type1000-70000 DWT
horizontal arm return angle±135 degrees
horizontal arm elevation30° up and 30° down
vertical arm swing angleinternal 30° / external 40°
energy consumption＜0.8 kWh/t
noise level≤80 dB
dust emission≤10 mg/m³
COMPLETE PARAMETER REFERENCE
Production capacity 200-1000 metric tons per hour (based on cement bulk density 1.2 t/m³)
Applicable ship type 1000 to 70000 deadweight tons (coasters to Panamax bulk carriers)
Horizontal arm return angle ±135 degrees horizontal slewing
Horizontal arm elevation angle 30 degrees upward and 30 degrees downward
Vertical arm swing angle Internal swing 30 degrees, external swing 40 degrees
Energy consumption Less than 0.8 kilowatt hours per metric ton
Noise emission Maximum 80 decibels at operator position
Dust emission concentration ≤10 milligrams per cubic meter with onboard dust collector
Installation type Hull-integrated, below-deck drive system
FEATURES
Mechanical & control systems
hull-integrated screw conveyor with below-deck drive motor
±135 degree horizontal slew for wide hatch coverage
30 degree upward and 30 degree downward boom elevation
vertical arm 30 degree inward and 40 degree outward sweep
onboard dust collection system maintaining ≤10 mg/m³
variable frequency drive for flow control 20-100 percent
wear-resistant screw flighting with replaceable segments
remote control from ship bridge or local station
automatic load sensing and slew limitation
APPLICATIONS
Operational scenarios
cement carriers — self-unloading for dedicated cement vessels in coastal trade
multi-purpose bulk vessels — flexible unloading at ports without shore unloaders
island supply ships — unloading to remote ports with minimal infrastructure
industrial raw material transport — clinker, gypsum, limestone direct discharge
grain and fertilizer vessels — self-discharge at agricultural terminals
emergency relief vessels — rapid cargo discharge without shore equipment
FAQ
Frequently asked questions
How is the shipborne unloader powered?
The unloader is driven by the vessel's main engine or auxiliary generator through a power take-off system. Installed power ranges from 400 to 800 kilowatts depending on capacity configuration. A dedicated motor control center is integrated into the ship's electrical system.
Can the system operate in rough sea conditions?
Operation is limited to sea state 3 (wave height up to 1.25 meters) for safe boom handling. The system includes motion sensors that automatically pause operation if vessel pitch or roll exceeds preset limits. Heavy weather securing procedures are defined for sea state 4 and above.
What maintenance access is provided?
The screw conveyor is accessible through deck hatches and below-deck maintenance platforms. Major wear components including screw flighting segments and liner plates are replaceable in-situ. Regular inspection intervals: screw flighting every 400 hours, gearbox oil every 3000 hours, dust filter cleaning weekly during operation.
How does the shipborne configuration benefit port operations?
Eliminates the need for shore-based unloaders, reducing terminal capital expenditure by 60-80 percent. Allows vessels to discharge at any berth with minimal shore interface. Reduces port turnaround time by 30-50 percent compared to waiting for shore unloader availability. Particularly advantageous for ports with limited unloading equipment.
OPERATIONAL REQUIREMENTS
Engineering & field data
vessel integration
installation requires hull penetration and structural reinforcement. Typical install duration 6-8 weeks during vessel construction or dry-dock.
power demand
400-800kW at 690V/60Hz or 440V/60Hz depending on vessel electrical system. Motor control center with soft-start included.
material constraints
max lump size 60mm, moisture ≤8% for cement, bulk density 0.8-1.6 t/m³, temperature up to 80°C.
operational limits
sea state ≤3 for operation, ambient temperature -15°C to +45°C, wind ≤15 m/s during boom operation.
crew training
24-hour certification covering boom controls, emergency stow, dust system, and motion safety. Annual refresher required.
capacity basis
cement bulk density 1.2 t/m³, free-flowing. Actual varies with material angle of repose and moisture content.
screw design
diameter 500-800mm, pitch/diameter 0.8, speed 30-90 RPM VFD, hardfaced flighting for abrasion resistance.
dust control
onboard baghouse filter, ≤10 mg/m³, explosion venting for combustible dust, spark detection optional.
installation note
factory assembly and test prior to vessel installation. Sea trials validation required after integration.

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Hangzhou Aotuo Mechanical and Electrical Co., Ltd.
Hangzhou Aotuo Mechanical and Electrical Co., Ltd.(Abbreviated as AOTUO) was established in 2003 and is China Custom 1000-70000 DWT 200-1000t/h Shipborne Screw Ship Unloader Manufacturers and 1000-70000 DWT 200-1000t/h Shipborne Screw Ship Unloader Suppliers and AOTUO is a nationalhigh+tech enterprise that focuses on the integrated solutions of the harbor dry bulk material transfer system, as well as the research and development, manufacturing, and service of high-end equipment for dry bulk material port loading and unloading...

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1000-70000 DWT 200-1000t/h Shipborne Screw Ship Unloader Industry knowledge

Self-Unloading Capability for 1000–70000 DWT Vessels

Hangzhou Aotuo Mechanical and Electrical Co., Ltd. (AOTUO) manufactures the ATXL-D shipborne screw ship unloader, a hull-integrated system that gives bulk carriers independent discharge capability without relying on shore-based unloaders. The unit is permanently installed on the vessel and handles cement, clinker, gypsum, limestone, grain, fertilizer and similar free-flowing dry bulk materials at rates from 200 to 1000 t/h.

As a China manufacturer of 1000-70000 DWT 200-1000t/h Shipborne Screw Ship Unloader, AOTUO has focused on screw unloading technology since 2003 and holds more than 100 patents and software copyrights. The ATXL-D is engineered for vessels from small coasters to Panamax bulk carriers, covering a working range that matches dedicated cement carriers, multi-purpose bulk vessels and island supply ships.

How the Shipborne Screw Unloader Works

The ATXL-D uses a vertical screw arm to reclaim material from the hold and a horizontal screw conveyor to transfer it to the discharge point. The horizontal arm slews ±135 degrees, elevates 30 degrees up and 30 degrees down, and the vertical arm swings 30 degrees inward and 40 degrees outward. This three-dimensional motion lets the feeder track the material surface without repositioning the vessel.

Material is lifted by the vertical screw to the horizontal screw, then discharged to a shore conveyor, receiving hopper or onboard transfer system. The below-deck drive motor and hull-integrated screw conveyor keep the deck clear and the center of gravity low. A variable frequency drive controls flow from 20 to 100 percent, and automatic load sensing limits slew and elevation to protect the structure.

Technical Specifications

Parameter Specification
Production capacity 200–1000 t/h (based on cement bulk density 1.2 t/m³)
Applicable ship type 1000–70000 DWT (coasters to Panamax bulk carriers)
Horizontal arm return angle ±135 degrees
Horizontal arm elevation 30° up / 30° down
Vertical arm swing angle Internal 30° / external 40°
Energy consumption <0.8 kWh/t
Noise level ≤80 dB
Dust emission ≤10 mg/m³ with onboard dust collector
Screw diameter 500–800 mm
Screw speed 30–90 RPM via VFD
Installed power 400–800 kW (vessel electrical system dependent)

Configuration Options and Range Fit

We configure the ATXL-D around the vessel's hull form, cargo hold arrangement and electrical system. The screw diameter, flight pitch, drive power and discharge chute are selected to match the target throughput and material characteristics. For projects that require a different mobility concept, our range includes the 1000-70000 DWT 200-1500t/h Rail mobile Screw Ship Unloader and the 600-15000 DWT 100-500t/h Fixed Screw Ship Unloader.

  • Drive system: below-deck motor with soft-start motor control center, integrated into the ship's electrical network.
  • Control interface: remote operation from the ship bridge or a local station, with automatic load sensing and slew limitation.
  • Dust control: onboard baghouse filter with explosion venting for combustible dust; spark detection optional.
  • Wear protection: hardfaced screw flighting with replaceable segments and liner plates.
  • Discharge: adaptable to shore conveyor, receiving hopper or onboard transfer system.

Material and Operating Boundaries

The ATXL-D handles free-flowing dry bulk materials with a bulk density of 0.8–1.6 t/m³, maximum lump size 60 mm, moisture up to 8 percent for cement, and material temperature up to 80°C. Capacity ratings are based on cement at 1.2 t/m³; actual throughput varies with angle of repose, moisture content and particle size distribution.

Operation is limited to sea state 3 (wave height up to 1.25 m). Motion sensors automatically pause the boom if vessel pitch or roll exceeds preset limits. Heavy weather securing procedures apply for sea state 4 and above. Ambient operating temperature range is -15°C to +45°C, with wind speed limited to 15 m/s during boom operation.

Installation, Commissioning and Training

Installation requires hull penetration and structural reinforcement, typically completed during vessel construction or a dry-dock period over 6–8 weeks. We assemble and test the unloader at our factory before shipment, then validate performance during sea trials after integration. Our engineering team coordinates with the shipyard and naval architect on foundation loads, cable routing and control room layout.

Crew training covers boom controls, emergency stow, dust system operation and motion safety over a 24-hour certification program, with annual refresher training. Documentation includes operation and maintenance manuals, spare parts lists and electrical schematics.

Maintenance and Serviceability

The screw conveyor is accessible through deck hatches and below-deck maintenance platforms. Major wear components, including screw flighting segments and liner plates, are replaceable in situ. Recommended inspection intervals are screw flighting every 400 hours, gearbox oil every 3000 hours, and dust filter cleaning weekly during operation.

AOTUO supports the ATXL-D with spare parts availability, technical guidance and remote diagnostic assistance. Our service network covers major ports in Asia, Australia and the Middle East, with response commitments aligned to project requirements.

Quality Assurance and Compliance

AOTUO operates a 14,000 m² A-level production workshop and maintains quality management, environmental management and occupational health and safety management system certifications. The company is the responsible drafting unit for industry standard JC/T 2575 "Bulk Cement Spiral Unloader" and has been awarded "Safety Production Standardization Third Level Enterprise."

Each ATXL-D unit undergoes factory assembly and functional testing before shipment. Sea trials validate capacity, dust emission, noise level and control response after vessel integration. We provide test reports and compliance documentation as part of the project handover package.

Information We Use to Configure Your Solution

To prepare a technical proposal and quotation for a shipborne screw ship unloader, we need the following project inputs. This information allows us to confirm capacity, drive power, structural interface and control architecture.

Input Category Details Required
Vessel data DWT, hull form, hold dimensions, hatch openings, deck layout
Material properties Bulk density, lump size, moisture content, temperature, abrasiveness
Capacity target Required t/h, operating hours per day, peak vs. average demand
Electrical system Voltage, frequency, available power, control interface requirements
Discharge interface Shore conveyor, receiving hopper, onboard transfer system details
Environmental limits Dust emission target, noise limit, ambient temperature range
Project schedule Vessel construction or dry-dock dates, installation window

Frequently Asked Questions

How is the shipborne unloader powered?

The unloader is driven by the vessel's main engine or auxiliary generator through a power take-off system. Installed power ranges from 400 to 800 kW depending on capacity configuration. A dedicated motor control center with soft-start is integrated into the ship's electrical system.

Can the system operate in rough sea conditions?

Operation is limited to sea state 3 (wave height up to 1.25 m) for safe boom handling. Motion sensors automatically pause operation if vessel pitch or roll exceeds preset limits. Heavy weather securing procedures are defined for sea state 4 and above.

What maintenance access is provided?

The screw conveyor is accessible through deck hatches and below-deck maintenance platforms. Major wear components including screw flighting segments and liner plates are replaceable in situ. Regular inspection intervals: screw flighting every 400 hours, gearbox oil every 3000 hours, dust filter cleaning weekly during operation.

How does the shipborne configuration benefit port operations?

Eliminates the need for shore-based unloaders, reducing terminal capital expenditure. Allows vessels to discharge at any berth with minimal shore interface. Reduces port turnaround time compared to waiting for shore unloader availability. Particularly advantageous for ports with limited unloading equipment.

What is the typical installation duration?

Installation requires hull penetration and structural reinforcement, typically completed during vessel construction or a dry-dock period over 6–8 weeks. Factory assembly and testing are completed before shipment, followed by sea trials validation after integration.

What support does AOTUO provide after commissioning?

AOTUO provides spare parts availability, technical guidance and remote diagnostic assistance. Our service network covers major ports in Asia, Australia and the Middle East. Crew training and documentation are included in the project handover.

Related Products and Categories

Our portfolio also includes 500-200000 DWT 200-3000t/h Rail Mobile Screw Coal Ship Unloader for applications with different operating ranges, interfaces or integration requirements.