BF Type Flotation Machine Structural Design for Sudden Power Failure and Anti-Settling Mechanisms

BF Type Flotation Machine is a critical piece of equipment in mineral processing plants. During actual production, unplanned shutdowns caused by sudden power outages or mechanical failures pose significant operational risks. For the BF Type Flotation Machine, which typically handles large tank volumes and high pulp density, the cessation of agitation causes solid particles to settle rapidly due to gravity, forming a hard packed layer at the bottom. This can lead to motor burnout during restarts or physical damage to the impeller and stator. The following sections detail how the BF Type Flotation Machine utilizes professional structural design to effectively mitigate the risk of "tank silting" or "sanding."

Dual Cone Impeller and Hydrodynamic Circulation Layout

The core advantage of the BF Type Flotation Machine lies in its unique Double Cone Impeller design. Unlike traditional flat-blade impellers, the upper and lower blades of the double cone impeller feature specific inclination angles. During normal operation, the impeller is responsible for suctioning air and pulp while maintaining a strong pulp circulation loop. When power is interrupted, the specific geometric structure of the impeller generates residual centrifugal force as the rotational speed decreases, slowing the rapid deceleration of the pulp. More importantly, the circulation holes located beneath the impeller allow for a brief micro-circulation at the bottom of the tank at the moment of power loss, preventing solid mineral particles from stacking vertically directly on the impeller hub.

Stator and Cover Plate Flow Guidance Gap Design

The Stator plays a key role not only in stabilizing flow but also in anti-settling design. The stator of the BF Type Flotation Machine is usually installed around the periphery of the impeller, with a grid design that maintains a precise radial gap between the stator and the impeller. This structure ensures that when the motor stops, the residual kinetic energy in the tank is converted into controlled eddy currents through the stator guide vanes. These currents disperse coarse particles toward the sides of the tank rather than allowing them to concentrate directly under the impeller. This "centrifugal dispersion" effect reserves crucial space for the impeller to move during a subsequent restart, preventing mechanical failure caused by excessive starting torque.

Pulp Self-Circulation System and One-Way Valve Effect

As a self-suction flotation machine, the BF Type Flotation Machine is equipped with advanced pulp circulation pipes. The positioning of the circulation pipe openings is strictly calculated. In the event of a shutdown, the suction pipeline experiences a change in pressure. The pulp level in the tank drops slightly because it is no longer supported by air bubbles. At this point, the residual pulp in the circulation pipeline flows back due to gravity, creating a flushing effect on the bottom of the tank. Although this structural "self-flushing" function is brief, it effectively loosens the initial sediment layer and reduces the packing density of solid particles.

Center Column and Air Suction Pipe Anti-Backflow Mechanism

The Center Column and Air Suction Pipe of the BF Type Flotation Machine feature anti-backflow designs. During a sudden stop, if pulp flows back into the air suction system, it can corrode the air path and increase the solid load at the bottom of the tank. By implementing reasonable overflow heights or physical anti-backflow baffles in the air suction pipeline, the BF Type Flotation Machine ensures that the pulp remains within the tank. This design guarantees that upon restarting, air can immediately enter the center of the impeller, quickly forming a gas-solid-liquid three-phase mixture. This utilizes the buoyancy of bubbles to bring settled sand back into suspension.

Restart Performance: From Silt Risk to Rapid Production Recovery

The BF Type Flotation Machine has undergone deep optimization for "restart torque" in its structural design. Because the bottom utilizes a shallow tank or special arc transition design, combined with the previously mentioned impeller gap protection, even if a small amount of sediment accumulates, it will not form a "dead zone." In practical operations, BF units are usually paired with soft starters or variable frequency drive systems. When power is restored, the low-speed start combined with the powerful radial displacement force of the impeller can strip the sediment layer by layer until the entire tank recovers normal circulation.