QD Bush Pulley Manufacturer

QD stands for Quick Detachable. A QD Bush Pulley is a heavy-duty industrial pulley system that utilizes a flanged, split-tapered bushing to secure the pulley rigidly to a rotating shaft.

Unlike conventional pulleys, the QD bushing features an external flange with pre-drilled holes. High-tensile cap screws or hex bolts are driven through the flange into the pulley hub, pulling the tapered bushing inward. This wedges the split bushing around the drive shaft with immense cylindrical gripping power equivalent to a press-fit assembly.

While both provide quick taper clamping, there are significant structural and operational differences:

• Mounting Flange: QD bushings have an external flange drilled for heavy cap screws, whereas Taper Lock bushings are flangeless with flush setscrews.
• Mounting Direction: QD pulleys offer dual-direction (reverse) mounting, whereas Taper Lock pulleys mount in only one direction.
• Torque & Shock Capacity: QD bushings provide higher holding torque, making them well-suited for high-vibration, reversing, and heavy shock-load environments.
• Fasteners: QD bushings use standard external hex head bolts which are easier to torque in heavy industrial field environments.

Reverse Mounting is the ability to install the QD bushing with its flange facing either away from the machine (standard mounting) or facing inward toward the machine (reverse mounting).

This provides machine designers and plant engineers immense layout versatility: it allows pulleys to be mounted on shorter motor shafts, minimizes shaft overhang to protect motor bearings, and permits access to tightening bolts even within constrained enclosures or close machine guards.

QD bushings are engineered with a shallow 4-degree taper and a continuous split extending completely through both the flange and the tapered barrel. When the heavy-duty Grade 5 or Grade 8 bolts are drawn down, the bushing exerts an exceptionally uniform radial clamping force over the entire shaft contact area.

This eliminates keyway distortion, prevents fretting corrosion, and handles violent torque spikes, heavy reversing duty, and severe shock loads commonly encountered in crushers, heavy pulverizers, and vibrating screens.

Installation:

1. Clean the shaft, bushing bore, bushing tapered barrel, and pulley hub bore.
2. Slide the bushing and pulley onto the shaft in the desired orientation (standard or reverse).
3. Align the clearance holes in the bushing flange with the threaded holes in the pulley hub.
4. Insert cap screws with lock washers and tighten progressively and evenly in an alternating circular pattern to the recommended bolt torque.

Dismantling: Remove all cap screws. Insert screws into the threaded jacking holes in the bushing flange. Tighten them evenly against the pulley face until the bushing breaks free from the taper without needing a sledgehammer or puller.

QD Bush Pulleys are the preferred choice across heavy-duty industries where reliability and ease of maintenance are non-negotiable:

• Mining & Aggregate: Primary jaw crushers, cone crushers, ball mills, and overland conveyors.
• Pulp & Paper: High-power refiners, pulp beaters, and wood chippers.
• Oil & Gas: Beam pumping units, mud pumps, and heavy compressor skids.
• Heavy HVAC: Large diameter induced-draft and forced-draft centrifugal fans.
• Sugar & Steel Mills: Cane shredders, rolling mill auxiliaries, and exhaust fans.