BM&M - High-Speed Gyratory Screening

The key to our enhanced industrial screening performance is our patented weight drive technology. BM&M’s drives use a stationary shaft and a high-speed eccentric weight that rotates on a bearing assembly to generate an eccentric gyratory motion. Our screening equipment is engineered to, essentially, “rotate around itself”, based on the center of gravity of the machine. This enables our systems to dissipate more energy for more efficient and effective performance.

Competitors’ gyratory screening machines use a more traditional crankshaft design that is inherently limited in the amount of energy it can dissipate and that often fails at high-speeds or under high load. Thanks to our unique design, our gyratory screening equipment is capable of higher speeds and larger strokes (diameter of gyratory movement) that combine to create a higher G-load. A high G-load is critical to the effective screening of any material.

Additionally, the design of other manufacturers’ gyratory screeners generally result in gyratory motion at only one end of the screen—the infeed end usually remains mostly stationary. Our drive units are positioned at the absolute center of the machine, and so create the same screening motion and efficiency over the entire screen surface.

Our high-speed gyratory screening equipment is easily adjustable in the field, allowing you to manage the stroke and the speed for optimum performance, no matter how difficult or variable the application. Our screening equipment can operate at speeds up to 330 RPM, versus a maximum of 180 RPM for most other manufacturers’ machines. Stroke can be adjusted to as much as 2” in diameter.

With more consistent movement and greater energy dissipation comes greater deblinding efficiency. That is, the enhanced performance of our gyratory screening machines inherently keeps their screens cleaner, even when working with challenging materials like meat/bone meal. The energy and uniformity of the gyratory movement prevents material from sticking to the screen or otherwise collecting or clumping, which could negatively affect performance.

For even better deblinding efficiency, all BM&M screens are equipped with “ball decks” that assist in keeping the screen clean. The motion of the screen propels an array of captive balls to constantly strike the underside of the screen element, which dislodges wedged-in particles or near-size plugs. Standard ball deck frames are manufactured from steel; stainless steel, aluminum, or hardwood frames are available upon request.

• Patented drive design provides superior efficiency and capacity
• Easily optimized to the application at hand
• Easy to install on any level of your facility, with no building vibration
• Permanently lubricated drive system reduces maintenance requirements
• Stroke and speed are field-adjustable for optimum performance
• Centered drive provides uniform screening motion over entire screen surface
• Infeed chute spreader for better efficiency and reduced wear on screen at infeed area
• Outstanding deblinding efficiency, with ball decks for enhanced screen cleaning
• Screen tensioning system makes it easy to keep screens taut for maximum efficiency
• 3-year drive system warranty