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Center Pier-Mounted Drive Units – Drum Output

Description

  • A low-speed, high-torque, totally enclosed gear drive with positive output torque overload protection
  • The drive unit is supported by a column in the center of the tank
  • The drive unit has an external rotating drive drum with attachment points for the rake cage
  • The drive access bridge typically spans one half of the tank
  • Used in industrial, municipal and mining clarifiers and thickeners
  • Typically used on tank sizes from 40 to 300 ft (12 to 100 m) in diameter

Features

  • Forged alloy steel main gear and pinion designed for 20 years of life calculated per AGMA 2001-D04
  • Precision, four-point-contact main bearing, with a 10-year warranty
  • Accurate torque gauge calibrated in ft-lbf, N-m or any units desired
  • Alarm and cutoff switches and maximum torque limiting via shear pin or pressure relief valve
  • No lower pinion bearing, eliminating a common source of drive failure
  • Designed for minimum maintenance with permanently lubricated secondary reducer


TORQUE CAPACITY - PIER-MOUNTED DRIVE UNITS
    Model
Continuous
Maximum Overload
Yield
    
ft-lbf     
N-m    
ft-lbf    
N-m    
ft-lbf    
N-m    
    DX-A*
3,000    
4,100    
6,000    
8,200    
8,100    
11,000    
    DX-B*
6,000    
8,200    
12,000    
16,400    
16,200    
22,000    
    D30-A*
16,000    
22,000    
32,000    
44,000    
94,000    
127,000    
    D30-B*
27,000    
36,500    
54,000    
73,000    
94,000    
127,000    
    D42-B*
35,000    
47,500    
70,000    
95,000    
195,000    
264,000    
    D42-C*
51,000    
69,000    
102,000    
138,000    
195,000    
264,000    
    D60-C*
65,000    
88,000    
130,000    
176,000    
440,000    
597,000    
    D60-D*
125,000    
169,500    
250,000    
339,000    
440,000    
597,000    
    D80-D*
165,000    
223,500     
330,000     
447,000     
750,000     
1,017,000    
    D80-E*
250,000    
339,000     
500,000     
678,000     
750,000     
1,017,000    
    D42-B*2
70,000    
95,000     
140,000     
190,000     
390,000     
529,000    
    D42-C*2
102,000    
138,000     
204,000     
276,000     
390,000     
529,000    
    D60-C*2
130,000    
176,000     
260,000     
352,000     
880,000     
1,193,000    
    D60-D*2
250,000     
339,000     
500,000     
678,000     
880,000     
1,193,000    
    D80-D*2
330,000     
447,000     
660,000     
895,000     
1,500,000     
2,034,000    
    D80-E*2
500,000     
678,000     
1,000,000     
1,356,000     
1,500,000     
2,034,000    
    D120-F*4
2,000,000     
2,712,000     
4,000,000     
5,424,000     
6,800,000     
9,220,000    
    Replace the * with the primary reducer option selected.
    Continuous: Torque at which main gear will have a life in excess of 20 years at normal operating speeds.
    Maximum Overload: The maximum safe, short term operating torque.
    Yield: The structural maximum torque based on the minimum yield strength of the main gear.


DX-Series Dimensions

Item
Description
1
Bridge Mounting Plate
2
Mounting Flange
3
Main Bearing
4
Drive Drum
5
Planetary Gearbox
6
Primary Speed Reducer
7
Torque Gauge Box


    Model
A
B
C
D
E
Weight
    
in    
mm    
in    
mm    
in    
mm    
in    
mm    
in    
mm    
lb    
kg    
    DX-A*
36    
914    
44    
1,118    
7.5    
191    
2.75    
70    
30    
762    
1,320    
600    
    DX-B*
36    
914    
44    
1,118    
9.5    
241    
2.75    
70    
30    
762    
1,530    
694    
    Replace the * with the primary reducer option selected.


D-Series Dimensions

Item
Description
1
Machine frame
2
Main Gearbearing
3
Pinion
4
Planetary Gearbox
5
Primary Speed Reducer
6
Torque Gauge Box
7
Drive Drum
8
Oil Drain


   Model
A
B
C
D
Mounting Flange1
Weight
    
in   
mm   
in   
mm   
in   
mm   
in   
mm   
in   
mm   
lb   
kg   
   D30-A*
48   
1,219   
47   
1,194   
5   
127   
12.5   
318   
32   
813   
2,200   
1,000   
   D30-B*
48   
1,219   
47   
1,194   
5   
127   
13.75   
349   
32   
813   
2,400   
1,090   
   D42-B*
60   
1,524   
60   
1,524   
5   
127   
13.75   
350   
44   
1118   
3,800   
1,720   
   D42-C*
60   
1,524   
60   
1,524   
5   
127   
15.5   
394   
44   
1118   
4,100   
1,860   
   D60-C*
84   
2,134   
80   
2,032   
6   
152   
17.63   
448   
62   
1575   
6,100   
2,770   
   D60-D*
84   
2,134   
80   
2,032   
6   
152   
19.63   
499   
62   
1575   
7,200   
3,270   
   D80-D*
96   
2,438   
103   
2,616   
6   
152   
20.5   
521   
Note 2   
Note 2   
10,500   
4,760   
    1 Maximum standard outside diameter of mounting flange. For larger flange sizes, contact factory.
    2 Consult factory.
    Replace the * with the primary reducer option selected.


Primary Reducer Option


E-type primary speed reducer

The E-type design uses helical gears for speed reduction. It has alarm and cutoff switches and a shear pin to provide triple protection of the drive unit. This design is used where the output speed is outside the limits of the F-type primary speed reducers or when an electro-mechanical type drive unit is desired.

More Information

F-type primary speed reducer

The F-type design uses a hydraulic pump-motor combination for speed reduction. It has alarm and cutoff switches and hydraulic relief (equivalent to a shear pin in the E-type primary speed reducer) to provide triple protection of the drive unit. This design is positive torque-limiting and will operate under stalled and semi-stalled conditions. Optional reversing rotation and variable speed are available. The torque indication and protection system is equally accurate for operation in either direction.

More Information

H-type primary speed reducer

The H-type design has all the features of the F-type primary speed reducer. It uses a stand-alone industrial hydraulic power unit. This design is used on higher horsepower and multiple pinion drive applications.

More Information

W-type primary speed reducer

The W-type design uses helical gears for speed reduction. It has shear pin and shear pin activated cutoff switch to protect the drive unit. This is simplified E-type design used where a torque gauge and adjustable alarm switch are not required.

More Information

Lift Mechanism Option

The DBS lift mechanism provides the ability to raise and lower the rakes up to 24 inches (600 mm). The D-series lift operates by raising the entire drive unit. The lift mechanism is fully contained within the drive unit. In most cases, the installation of a DBS lift equipped drive unit is no more complicated than a normal non-lifting clarifier drive.

The lift option is offered with manual or powered operation. The powered lift mechanism provides positive lift force control to prevent damage to the rakes or the screw jack.

More Information

Ordering Information

Pier-Mounted Drive Unit Model Number Lift Option Specification Extension
Series
  Rake Gear
  Pitch Dia.
  (Inches)

 - 
  Secondary
  Speed
  Reducer
  Primary
  Speed
  Reducer
  Number
  of Pinions

 - 
  Lift
  Option
  Lift
  Capacity
  (tons)
  Lift
  Travel
  (inches)
  Lift
  Actuator
  Option

D

X for no final
gear-bearing

A

E
F

(N/A)

(N/A)

(N/A)

(N/A)

(N/A)
B
30
A
1 (omit)
L
Consult Factory
B
42
B

E
F
H

1 (omit)
2
C
60
C
1 (omit)
2
3
4
D
80
D
E
120
F

Example: Model D30-AF-L1512F

D is for a pier-mounted drive unit; 30 is the size of the final gear pitch diameter in inches; A is the size of the secondary speed reducer; F is the type of the primary reducer; L is for a lift mechanism; 15 is the lift capacity in tons; 12 is the lift travel in inches; F is the type of the lift actuator.

Standard Features

Alarm and cutoff switches
O&M manual in PDF format
6" torque gauge indicating real torque
(not available on H-type primary reducer)

Optional Features

4-20 mA torque transducer
Bi-directional operation (available for F and H-type primary reducers)
Condensate control unit
4-20 mA lift position transducer
Variable speed
Loss motion switch
Special electric motor
Oil heater (available for F and H-type primary reducers and main gear housing)
Special coating
Oil temperature switch
Oil level switch
Explosion proof switches