Walk-Behind Sweeper

Overview

A walk-behind sweeper mechanizes the broom-and-dustpan at warehouse scale. The operator walks behind it at normal pace while a full-width rotating broom collects debris into an onboard hopper, a side broom feeds in material from edges, and a filter system keeps the fine dust that a manual broom would throw into the air. One machine covers 2,500–3,800 m² per hour, roughly six to eight times the rate of manual sweeping, and battery power makes it usable indoors during working hours.

The overthrow principle

The core of the machine is the Main Broom Assembly, a cylindrical broom spanning the chassis width that rotates against the direction of travel, counterclockwise when viewed from the right, on a forward-moving machine. The bristle tips strike debris and fling it forward and up, over the top of the broom, into the Hopper Bin mounted ahead of the broom. This "overthrow" arrangement seems backwards but has a decisive advantage over sweeping debris straight in at floor level: heavy items (bolts, stones) and light litter follow the same thrown trajectory into the bin, and the hopper fills from the top, so it uses its whole volume before pickup degrades.

The broom itself is a Broom Core Tube tube fitted with replaceable Bristle Strip rows, driven at 300–500 rpm by the Broom Drive Motor through a Drive Belt. Bristle contact is critical: too little misses debris, too much wastes battery and wears the strips. The Broom Height Adjuster sets the contact patch, checked by running the broom stationary for a few seconds and reading the width of the polished stripe it leaves, 30 to 50 mm is the standard pattern.

The Side Broom Assembly handles what the main broom cannot reach. Its tilted Side Disc Broom spins at the right front corner, flicking debris out of wall edges and corners into the main broom's path, extending effective width to as much as 900 mm. A Coil Spring on the Side Broom Arm lets it bounce off obstacles rather than break.

Dust control

Sweeping without dust control just relocates fine dust into the air. The Dust Suction Fan holds the broom chamber under slight vacuum, drawing dusty air up through the Panel Filter, a pleated panel with one to two square metres of media that captures particles down to a few microns, and exhausting clean air. The Sealing Skirt Set around the chamber maintains that vacuum at floor level.

As the dust cake builds, airflow drops. The Filter Shaker Motor, an eccentric-weight vibrator on the Filter Frame, raps the panel for a few seconds when the operator presses the shaker button, dropping the cake into the hopper. Shaking before every hopper emptying is the habit that keeps dust control working; a blinded filter is the most common cause of a "dusty" sweeper.

Power and drive

A 12 V deep-cycle 12 V Battery low in the Battery Tray feeds the broom, fan, and traction circuits for two to three hours; the onboard Power Supply charger plugs into any wall outlet overnight, and lithium variants add a BMS Board. The Traction Drive propels the machine through a Helical Gear Pair reduction to the rear Wheel Assembly pair at up to 4.5 km/h while the operator steers on the front Front Caster. The Freewheel Clutch clutch lets the machine roll freely when off, so a dead battery never strands it.

Operation

The sequence at the Handlebar & Controls is: key on at the Key Switch, lower the broom with the Broom Engage Lever, hold the Traction Bail, and walk. The bail is a dead-man control, release it and the machine stops. At the dumpster, the operator shakes the filter, unlatches the Hopper Latch pair, and lifts the bin out by its Hopper Handle; a full bin of mixed warehouse debris weighs 15–25 kg. Routine maintenance is bristle-strip replacement when the pattern can no longer be adjusted in, and filter replacement when shaking no longer restores airflow.