800-5000 DWT 150-500t/h Vehicle Mounted Screw Ship Unloader

A Road-Mobile Unloading System for Small and Mid-Size Vessels

The ATXL-C is a complete unloading plant on a heavy truck chassis. The articulated screw conveyor arm reaches into the hold, lifts material vertically and transfers it through an enclosed path to the shore receiving point. Because the machine travels on public roads and sets up at the berth in under 30 minutes, it serves small ports, river terminals, temporary construction quays and emergency discharge operations without rail tracks, foundations or permanent shore cranes.

Our design combines a standard 8x4 or 10x4 truck chassis with four-point hydraulic outriggers, a slewing horizontal boom and a vertical screw arm. The result is a mobile unloading asset that can be repositioned between berths, ports or project sites as cargo flows change.

Product Range and Where This Model Fits

AOTUO supplies a family of screw ship unloaders and auxiliary equipment. The vehicle mounted unit is the most mobile configuration in the range, intended for smaller vessels and locations without fixed handling infrastructure.

Material Handling and Application Fit

The ATXL-C handles free-flowing dry bulk materials with a bulk density of 0.8–1.6 t/m³, maximum lump size 50 mm, moisture up to 10% for cement and material temperature up to 80 °C. Capacity ratings are based on cement at 1.2 t/m³; actual throughput depends on angle of repose, moisture and particle size distribution.

• Cement and cementitious powders: bagging plants, distribution terminals and coastal transfer where silo receiving is required.
• Clinker and crushed minerals: temporary construction ports for bridge, dam, wind farm and pipeline projects.
• Grain, fertilizer and feed ingredients: agricultural bulk terminals and island logistics with small ships.
• Emergency discharge: rapid deployment after port equipment failure or natural disaster.

Mechanical Configuration and Operating Envelope

The unloading arm combines a horizontal boom with ±135° slewing and 30° upward / 30° downward elevation, plus a vertical screw arm with 30° inward and 40° outward swing. This geometry covers a wide hatch area and allows the screw to follow the material surface as the hold empties.

Controls, Automation and Power

The unloader is operated from a climate-controlled cabin or by remote control pendant. Automatic slew and elevation limit protection prevents over-travel, and the screw conveyor speed is regulated by variable frequency drive from 30 to 100 RPM. Power can be taken from the truck engine power take-off (up to 250 kW) or from an external shore supply of 400 V / 50 Hz three-phase with an 80 m cable. A standby diesel generator is available as an option.

For ports moving toward centralized control, we can integrate the unloader with the terminal’s material transfer system, including belt conveyors, air slides and dust collectors. The control system is configured around the required line interface, whether that is a simple local panel or a higher-level monitoring link.

Installation, Site Requirements and Commissioning

No foundation or rail construction is required. The unit is positioned at the berth, four hydraulic outriggers are deployed, the boom assembly is unfolded and the dust collection system is connected. Setup takes 20–30 minutes with a two-person crew and no crane assistance.

• Berth surface: reinforced concrete or compacted gravel with minimum load capacity 15 t/m²; flatness tolerance ±20 mm over 3 m.
• Berth width: minimum 8 m for outrigger deployment.
• Ground pressure: outrigger pads distribute weight to approximately 8–10 t/m²; steel mats are included for unpaved surfaces.
• Environmental limits: ambient temperature -10 °C to +45 °C; maximum operating wind speed 16 m/s, with outriggers deployed above 10 m/s.
• Road mobility: maximum road speed 80 km/h, turning radius 12 m, gradeability 15% loaded / 25% empty; transport permits required for height above 4.0 m.

Quality Control and Documentation

AOTUO is the responsible drafting unit for the industry standard JC/T 2575 “Bulk Cement Spiral Unloader” and holds more than 100 valid patents and software copyrights. Production takes place in a 14,000 m² A-level workshop with testing equipment, under quality, environmental and occupational health and safety management systems. Each vehicle mounted unloader is inspected for screw conveyor alignment, hydraulic function, outrigger operation, dust collection performance and control response before dispatch.

Documentation supplied with the equipment covers operation and maintenance manuals, electrical and hydraulic schematics, commissioning records and a recommended spare parts list. Operator training is available for vehicle maneuvering, outrigger deployment, boom control, emergency procedures and dust system operation.

Maintenance and Serviceability

The screw conveyor is designed for abrasive materials with hardfaced flighting. Standard screw diameter is 350–500 mm depending on capacity, with a pitch-to-diameter ratio of 0.7. Maintenance intervals are straightforward: truck engine and chassis follow the manufacturer schedule at 5,000 km; screw conveyor inspection every 300 operating hours; dust filter bag cleaning weekly; hydraulic oil change every 2,000 hours; annual inspection of outrigger cylinders and slew bearing.

Key components are accessible from the deck and the enclosed conveyor path minimizes spillage. AOTUO supports the fleet with spare parts supply and technical guidance through its service network.

Information We Use to Configure Your Solution

To prepare a suitable proposal for a vehicle mounted screw ship unloader, we need the following project inputs. These determine capacity, arm geometry, power option and discharge interface.

• Vessel data: deadweight range, hatch dimensions, hold depth, cargo type and typical parcel size.
• Material properties: bulk density, moisture content, lump size, temperature and angle of repose.
• Throughput target: required tons per hour and daily operating hours.
• Site conditions: berth surface, available width, ground bearing capacity, ambient temperature and wind exposure.
• Discharge interface: receiving point (silo, hopper, conveyor or truck), connection height and required dust control level.
• Power supply: shore power availability, voltage and frequency, or preference for truck engine PTO.
• Control and automation: local control, remote pendant or integration with terminal control system.
• Compliance requirements: local port authority dust and noise limits, road transport regulations.

Frequently Asked Questions

How is the vehicle mounted unit transported between ports?

The unloader is fully integrated on a standard heavy truck chassis and drives on public roads. Width is 2.55 m and height is 4.0 m in transport position. Road transport permits are required for height. Maximum travel distance between ports is 800 km without special logistics. No disassembly or crane assistance is needed for relocation.

What is the typical setup time at a new berth?

Positioning the truck, deploying four hydraulic outriggers, unfolding the boom assembly and connecting the dust collection system takes 20 to 30 minutes with a two-person crew. Power is supplied by the truck engine power take-off or external shore connection. No tools or additional equipment are required.

Can the unit operate on unpaved or soft ground?

Outrigger pads distribute weight to approximately 8–10 t/m². For unpaved surfaces, steel outrigger mats are included as standard equipment. Avoid operation on soft clay, sand dunes or saturated ground without proper ground reinforcement or additional matting layers.

What maintenance schedule is required?

Truck engine and chassis maintenance follows the manufacturer schedule at 5,000 km intervals. Screw conveyor inspection every 300 operating hours. Dust filter bag cleaning weekly. Hydraulic oil change every 2,000 hours. Annual inspection of outrigger cylinders and slew bearing.

What material limits apply to the ATXL-C?

Maximum lump size 50 mm. Material moisture content up to 10% for cement. Bulk density range 0.8–1.6 t/m³. Material temperature up to 80 °C. Capacity ratings are based on cement at 1.2 t/m³ and free-flowing condition; actual throughput varies with material characteristics.

Does AOTUO provide training and spare parts?

Yes. A 16-hour training program covers vehicle maneuvering, outrigger deployment, boom control, emergency procedures and dust system operation. Annual refresher training is recommended. AOTUO supports the equipment with spare parts supply and technical service through its global service network.