In order to transfer torque from the mix shaft to the blade, manufacturers use a number of configurations:
CENTER BORE ONLY: A round hole is made in the center of the blade. The blade is sandwiched between an upper and lower surface (this could be a shoulder on the shaft and the retaining bolt, or a pair of washers or taper plates). As the bolt is tightened it applies pressure to the blade. It is this pressure that transfer torque to the blade. This design is used on none but the smallest blades, 4" and below. Typically found on after market lab shafts and lab equipment.
CENTER BORE and PIN HOLES: By far this is the most common configuration. A center hole is drilled in the blade. Two (2), three (3), four (4) or more holes (pin holes) are drilled around the center hole. Drive pins extend from a hub or taper plate through the blade and typically extend into a lower plate or washer. Torque is transfered from these pins to the pin holes in the blade. This design is used throughout the horsepower range and blade size range. As blade diameter increases, the distance between pinholes and/or the number of pinholes is increased.
CENTER BORE and KEYWAY: This configuration is primarily promoted by Hockmeyer Equipment Corporation. In this deisign a keyway is cut into the blade extending from the center bore. The diapersion blade is again sandwhiched between a pair of taper plates, which are also keyed. A keyway is also cut into the shaft. Torque is transfered from the shaft through a key to the blade. Typically used through 60 HP with blades up to approximately 18" in diameter.
COMBINATION KEYWAY and PIN HOLES: Unique to Hockmeyer, this design is typically used with machines over 60 HP and blades over 18" diameter, the bore and keyway is supplemented by the addition of 2 or more pin holes.
HUB MOUNT: A collar is attached to the blade. This assembly is slid onto the shaft and secured with set screws. A key may also exist for better torque transfer. The hub can be either integral (welded to the blade) or removable (bolted to the blade). Torque is trasfered from the shaft to the hub and to the attached blade. This design is used primarily for mid shaft mounting of a blade (a second blade positioned above the end mounted dispersion blade) but can also be used to attach a blade to the end of a shaft.
At DisperseTech, we can produce blades to meet any of the standard bores as well as any of your custom mounting requirements.
CLEAR DIAMETER: The clear diameter defines a circle at the center of the blade free from obstruction.Ã‚Â It defines the largest reinforcing disk and/or mounting hub that a blade can accomodate.Ã‚Â This is more a property of the blade style rather than the disperser.Ã‚Â It is most important for blade styles with louvers, rings, and inset teeth, including:
Visit our blade shop to view various replacment configurations.