Docks storage sheds, long overland systems.


Economically and cleanly elevate material at some point along a mostly conventional-angle conveyor system.


The DSI Adder Snake (Patent Awarded 2017).


Limited only by available conveyor equipment.

Sandwich conveyor fed by low-lift tripper

Sandwich belt high angle conveyors have long been known as the best solution for tight spaces where a steep lift is required to maintain a small footprint. However, applications are also quite common in which a large footprint is available, but a high angle is needed in just a small portion of the conveyor path. Because a sandwich belt system uses a wider belt to achieve the same conveying rate as a conventional conveyor at the same speed, in an application such as that described above, the question must be asked:

DSI Sandwich belt high angle conveyor with DSI Adder Snake
DSI Adder Snake entrance

Should you extend the tail of the sandwich belt, or should you break up the path into two separate conveyors, in which a narrow conventional conveyor discharges on to the wider Sandwich belt system?

For instance, a tripper may travel horizontally along the length of a dock to feed a perpendicular ship loader. In cases where the ship loader is at a considerably higher elevation than the dock conveyor, a standard tripper would require that the dock conveyor and dock be much longer than otherwise necessary, as its uplift would extend quite far back from its discharge pulley.

Historically, the solution, in this case, would be to design a much lower-lift tripper, which would then feed on to a Sandwich Belt High Angle Conveyor. While this is a perfectly viable solution, which has been executed in the past as shown in Figure 2, it would be preferable to eliminate the conventional-to-sandwich transfer if possible.

The DSI Adder Snake (see Figure 1 and Figure 3), solves the problem by swallowing the narrower conventional belt (Item 1), along with its material, into the two wider sandwich belts (Items 2 and 3). This allows the material to enter the sandwich belts with minimal disturbance and without the energy loss and additional equipment required for a standard transfer.

Complete DSI Adder Snake arrangement
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