Manufacturing

Shafts and hubs

IMG 7387shaftsShafts are manufactured to a stringent straightness tolerance of 1mm/metre of shaft length. Often 50% of this is achieved.
Ears are attached to circular hubs using deep penetrating continuous welds. Ears are never attached directly to hollow shafts.
Hubs and ears are machined using CNC machines to minimise clearances between ear and hub. This ensures weld strength. 

 

Impeller blades

impeller bladesAFX manufactures impellers for all applications, including high viscosity duty. However, as most applications are either flow or shear dependant, the F3 range of high flow impellers, or the P4 range of high efficiency gas dispensers, are the workhorses of the AFX stable. Other impellers available are flat blade radials, pitch blade turbines, high viscosity anchors and helicals, and specialised impellers for pumping, foam breaking and dispersion. Impellers can be manufactured in all materials, including exotics, and can be coated in rubber, urethane, epoxy or other specialised materials. Impeller blades are carefully checked to ensure that tolerances on angle, camber and curve are maintained. Out-of-specification blades are rejected. Blades are machined where hub and ear attach to ensure flatness. Often, the problems of loose blades are caused by blade flexing, resulting from a lack of flatness. Where rubber and urethane lining is required, the leading edges of the blade are machined to maximise bonding with the metal blade.

 

Bearing pedestals

bearing pedestals new The incorporation of robust pedestals are critical for the reliable operation of some large agitators. These independent units are designed to accommodate all the loads and forces applied as a result of the mixing action. This ensures that the gearboxes are only required to tolerate the torque imposed, and are isolated from the thrust and bending moments. Pedestals are carefully machined to ensure accurate alignment with the gearboxes. The upper and lower mounting surfaces are machined (the entire unit is machined on a 5-axis machining centre to ensure accuracy with the bearing bases and mounting surfaces).

 

 

 

Mounting bases

IMG 7303mount base resisedMounting bases are critical components in ensuring that the gearboxes are correctly aligned and mounted to the beams or structure. This reduces the potential of twisting or flexing of the gearbox housing - a common cause of failure of proprietary gearboxes. All large, top entry AFX agitators are fitted with integral mounting bases, or pedestals where necessary. All bases have machined pads, or surfaces, top and bottom, to ensure accurate and positive alignment.

 

 

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