site name Siwertell

Road-mobile unloaders

Siwertell road mobile unloader

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Road-mobile unloaders: your terminal on a trailer

Siwertell road-mobile unloaders provide the ideal solution for customers using jetties with minimal infrastructure, especially when they have operations at more than one location.

They can handle a wide range of dry bulk materials at capacities of up to 500t/h and have a totally-enclosed conveying line, offering flexible, environmentally-friendly, economical operation.

Road-mobile unloader is the ideal solution for multi-port operations

Road mobile images to show how to set it up

Road-mobile units are based on screw conveyor technology. The folding structure is mounted on a semi-trailer for rapid self-propelled transportation between ports. It takes only 30-45 minutes to complete the unfolding operation. Packing away is equally rapid and these tasks can be carried out by a single operative.

Alternative installations available

Some customers need small unloaders, but without the full road-mobile capability. The unloader can be installed on a fixed gantry or on a foundation turret. These configurations require the ship to be moved along the jetty during unloading operations. If a degree of in-port mobility is required, a gantry-mounted unloader can be equipped with self-propelled rubber wheels or steel wheels for installation on rails.

Siwertell road-mobile unloader on trailer

Economical and environment friendly

Siwertell’s screw-conveying system provides continuous, high-capacity through-ship performance, cutting unloading times and shipping costs. Energy costs are very low per metric ton handled. An enclosed system eliminates spillage; therefore there is no loss of material or clean-up costs. Maintenance and spare parts expenses are kept to a minimum as Siwertell road-mobile unloaders are largely based on readily-available standard components. Staffing costs are low as only one person is required to operate a Siwertell road-mobile unloader.

A model to suit all operations

Siwertell road-mobile unloaders are available in three different sizes – the Siwertell 5 000 S, 10 000 S and 15 000 S – the largest offering an unloading capacity of up to 500t/h for discharging ships up to 15,000 dwt.


Please click below to open our brochure about the Siwertell road-mobile unloaders, which includes technical data.

Brochure Siwertell road-mobile unloaders

Inlet feeder

The inlet feeder is a vital component of the ship unloader. Rotating in the opposite direction to the transport screw inside the vertical conveyor, it increases the fill factor from 15% up to 80%, delivering a high-capacity unloading system. Bulk material is picked up below the cargo surface, minimizing dust creation.

Screw conveyor

The self-supporting screw conveyor transport tube is manufactured using high quality material. The wear-resistant, conveyor screw is supported by gearbox, end and intermediate bearings. Depending on the commodity to be handled, casings and other parts, or the entire transport screw, can be manufactured in stainless steel.

PLC system

The field bus-based electrical system, including the programmable logical controller (PLC), is a modern system developed for this type of installation. It includes an information display for alarms and current operation status along with diagnostic and troubleshooting information. Much of the information is also presented directly to the operator via the wireless remote control. The system includes a remote troubleshooting and software upgrade function directly from Siwertell.

Diesel engine

The turbo-charged diesel engines have various installed power ratings depending on the unloader model. All varieties are emission certified to the latest regulations from the EU and the US EPA. The main engine powers the hydraulic pumps that provide all the unloading system’s movements. The hydraulic system consists of the hydraulic oil reservoir, proportional valves, directional valves, oil filters, pressure sensors, oil temperature sensor, oil level sensor and oil cooler. An electric motor to drive the hydraulic pumps can be supplied as an option.

Double-bellows system

The up and down movements of the loading bellows are electrically-controlled from the ground, via a wireless control box, or from the electrical connection box at the bellows. A level guard sends a stop signal to the unloader, indicating that the receiving equipment (truck, belt conveyor or rail wagon) cannot accept any more material. The double-bellows system makes it possible to load at two points alternately using internal slide gates, meaning that unloading can continue when changing trucks or wagons. This feature can be automatically-controlled by the PLC or manually from the wireless control box.

Dust filter

A dust filter with collector is installed on top of the loading conveyor. It creates negative pressure and minimizes the risk of dust emissions from the transfer of material from the unloader to the receiving equipment. It automatically returns the collected dust to the conveying system.

Pneumatic conveying system

Designed to be the perfect complement for Siwertell road-mobile unloaders, this high-capacity portable pneumatic system can convey cement over considerable distances, horizontally and vertically. It is mounted on a specially-designed semi-trailer equipped with an electronic braking system (EBS). The self-contained system is powered by a turbo-charged Caterpillar diesel engine meeting the latest EU and US EPA regulations. An electric motor can be supplied as an option to power conveying operations.

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