Dos Santos International: History of Sandwich Belt High Angle Conveyor
What this video shows
This Dos Santos International video traces sandwich-belt high-angle conveying back to Joseph A. Dos Santos's 1979 study on elevating large quantities of coarse bulk materials — rock, aggregate, coal — at the steepest possible inclines. The force analysis behind that study produced the design formulas the DSI Sandwich Belt high angle conveyor is built on.
What the footage shows
Dos Santos International describes the development context for sandwich-belt high-angle conveying of coarse bulk materials on steep routes.
Process challenge
Demonstrated solution
Dos Santos International presents the DSI Sandwich Belt high angle conveyor, built on formulas created in 1979 to guarantee the successful design of steep-incline equipment for coarse bulk materials.
Technical overview
Key features
- •Two conveyor belts arranged face-to-face to sandwich and firmly contain the material being carried
- •Hugging pressure on the material generated through belt tension and curved, snaking profile geometry
- •Three-roll troughing idler configurations that help contain material within the sandwiched belt structure
- •Available in C-shape and S-shape profile configurations with a long bottom-belt approach and flexible discharge points
Benefits
- •Enables steep-incline and vertical elevation of bulk material beyond the angle limits of conventional troughed belt conveyors
- •Reduces the plan-view footprint and structural steel needed compared to shallow-angle conveyor systems covering the same lift height
- •Uses standard conveyor components, keeping maintenance requirements comparable to or lower than conventional conveyors
- •Handles a wide range of material sizes, from fine particles to large lumps and coarse aggregate
Typical applications
- •Mining and mineral processing operations requiring steep-angle or vertical elevation of ore, coal, or waste rock
- •Port and harbor bulk material handling, including mobile high-angle ship loading systems
- •Tunneling and underground mining muck removal where space for shallow-angle conveyors is limited
- •Recycling, cement, pulp and paper, and wastewater treatment facilities that need compact steep-incline conveying
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About this video
In 1979, Joseph A. Dos Santos undertook a major study to develop a means of moving and elevating large quantities of bulk materials — including coarse products such as rocks, aggregate and coal — at the steepest possible inclines.
He investigated and analyzed the many forces generated in this seemingly simple concept and created the formulas that guaranteed the successful design of such equipment. Dos Santos International presents the DSI Sandwich Belt high angle conveyor as the result of that work — one design within high-angle sandwich belt conveyors, itself a steep-incline branch of mechanical conveying and belt conveyors.
How to read the footage
The equipment family serves mining and mineral processing, recycling and building materials applications, including mobile high-angle ship loaders. The footage works best for examining the visible process sequence, equipment interfaces, access and material route — a video cannot confirm conditions outside the frame or values that were never measured.
Separate direct observation from commentary. Record what the equipment does, where material enters and leaves, which components move and how an operator interacts with the system. Treat capacity, accuracy, containment, energy, certification and service life as manufacturer claims unless attributable test evidence backs them.
Engineering questions raised by the footage
- What feed distribution, rate and material trajectory enter the equipment?
- How are spillage, carryback, dust and displaced air controlled?
- Which belt, chute, vehicle or storage geometry constrains the layout?
- How can operators inspect, clean and isolate the equipment safely?
Answer these with representative material data. Particle size distribution, bulk density, cohesion, moisture, abrasion, temperature and hazard properties can change the response of equipment that looks identical on screen.
From footage to project review
Before selection, request the current data sheet, scope of supply, operating envelope, test method, maintenance requirements and exclusions for the offered configuration.
For a project review, compare the video with drawings and written process data. Confirm the upstream supply, downstream receiver, utilities, controls, cleaning method, safe isolation and response to credible faults. That turns visual discovery into a testable engineering inquiry.
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