Bridge Mounted Shaft Drives
The mechanism is a centrally driven shaft with a full bridge spanning the tank diameter. Typically, only half the bridge is covered with a walkway and handrails.
The shaft drive is mounted on the bridge and the shaft and the truss type rake arms with scraper blades, and squeezes. hang from the drive.
The Feed inlet to the Clarifier is normally through a pipe running from the side of the unit to the center feedwell.
Direct Shaft Drives
For light or heavy-duty mixing applications or small (< 25 ft dia), light duty clarifiers, direct drives can offer a cost-effective alternative.
PRE’s direct drives use the same robust upper reducer as their normal drives and also include direct torque measurements which is displayed on the easy-to-read torque. A 4 - 20 mA signal which may also be sent to the control room for remote monitoring.
This provides add extra level of instrumentation and feedback which is not normally included with most make sure drives.
Dual Shaft Drives
The dual shaft drive employs the same design for mounting on the bridge and the shaft and rakes hang from the drive.
With this design there is a separate“ high” speed drive which normally powers either an impeller In the case of solids contact clarifiers or a flocculator in the case of flocculating clarifiers.
This allows a single drive to perform multiple functions in a compact, easy to maintain single unit. It is possible to equip this auxiliary drive with a VFD if it is desired to run with variable speeds.
Shaft Drives with Lift Mechanisms
With either the single or dual drive, the shaft drive maybe equipped with a lift mechanism. This mechanism lift the entire shaft and rake assembly off the floor of the clarifier.
Lift mechanisms are normally employed and applications with high and heavy solids loading. This would apply to thickening applications.
As the torque increases due to solids loading the lift automatically raises to reduce the torque loading on the drive. When the lift activates, it actuates an alarm to alert the operator of the increased torque.
The lift continues to raise the Rakes to the maximum lift height at which time it sounds an alarm and stops the drive if the torque has not decreased.
Multi-pinion Shaft Drives
For applications where high torque conditions are the normal mode of operation, multiple pinion stakes can be provided on the drive. The number of opinions varies from 2 up to four depending upon the application. Please high torque applications are normally encountered in the minerals industry for the processing of streams with high concentrations of solids.
With the use of multiple pinions, it is possible to design a drive rated for over 2,000,000 ft lbs of torque.
hydraulic Drives
An electric motor drives a high-pressure hydraulic pump system with integral valves, hydraulic motor, oil reservoir, and filter.
Hydraulic Drives use the same robust secondary reducer as their precision main gear/bearing drives and include the same torque measurement display with an easy-to-read torque dial.
An optional 4 - 20 mA signal can be specified which may be sent to the control room for remote monitoring.
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