A roller crawls, pulls air poorly and never gets its exhaust hot. This unit is sized around the space left on the hood side and regenerated on backpressure, not temperature.
| Vehicle | Road Roller Black Smoke Purifier (Road Roller DPF) |
|---|---|
| Mounting | Custom bracket per model |
| Element | Water-wash metal filter |
| Regeneration | 1-minute water wash |
| PM efficiency | 90%+ at rated conditions |
| Patent | ZL 2018 1 0598975.7 |
| Brand | AIFILTECH |
| Customisation | Yes |
A roller is a low-speed, high-load machine. The engine pulls hard for hours, but the machine moves at a few kilometres an hour, so ram air is negligible and heat builds up under the hood. The drum, canopy and water tank consume most of the available surface, leaving a short run of pipe on the hood side or top.
That duty cycle sets two requirements: the housing must be compact, and regeneration cannot depend on exhaust temperature. The usual failure mode of a wall-flow ceramic substrate on a roller is not blockage — it is an incomplete burn. The regeneration cycle finishes and the soot is still inside.
On a single-drum roller the hood side usually accepts a short cylindrical housing, flanged at the original silencer position, without disturbing the drum or the water spray system. Tandem rollers are tighter; most units become a flat housing laid along the hood. On pneumatic-tyre rollers the stack points rearward, so a coaxial replacement is simplest.
In every case the outlet must not face the canopy air intake, and radiant heat must not reach the hydraulic hoses.
The whole machine vibrates, so bracket bolts loosen. We use a heavier clamp band with double nuts and a locking washer, plus a damper pad between bracket and frame so vibration does not travel straight into the housing weld. On other vehicle types this is optional; on a roller it is mandatory.
Set it from backpressure, not from hours or kilometres. A roller accumulates soot slowly but continuously; fit a backpressure gauge or a pressure tap at the outlet and wash at the threshold the datasheet specifies. The element itself washes in about a minute.
<strong>Can a roller be fitted with a DPF?</strong><br>Yes, but the temperature problem has to be solved. Specify a water-wash metal element so regeneration does not depend on exhaust heat.
<strong>Will it affect compaction performance?</strong><br>Any effect comes from backpressure. Keep rated-point backpressure inside the original allowance and engine output stays unchanged in any perceptible way.
<strong>Does the exhaust pipe need modification?</strong><br>No. The flange matches the original silencer position and the unit clamps on without welding.
