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Center Pier-Mounted Drive Units - DM Series
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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
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Features
- Forged alloy steel main gear and pinion designed for 20 years of life calculated per AGMA 2001-C95
- Composite 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 bearings and gears
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TORQUE CAPACITIES - PIER MOUNTED DRIVE UNITS WITH COMPOSITE MAIN BEARING
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| Model |
Continuous
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Maximum Overload
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Yield
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ft-lbf
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N-m
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ft-lbf
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N-m
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ft-lbf
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N-m
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| DM075-A* |
18,000
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24,500
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36,000
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49,000
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94,000
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127,000
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| DM075-B* |
27,000
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36,500
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54,000
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73,000
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94,000
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127,000
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| DM100-B* |
36,000
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49,000
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72,000
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98,000
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195,000
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264,000
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| DM100-C* |
51,000
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69,000
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102,000
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138,000
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195,000
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264,000
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| DM150-C* |
70,000
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95,000
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140,000
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190,000
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440,000
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597,000
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| DM150-D* |
110,000
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149,000
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220,000
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298,000
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440,000
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587,000
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| DM150-C*2 |
140,000
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190,000
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280,000
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380,000
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880,000
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1,194,000
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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.
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DM-Series Dimensions
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Item
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Description
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1
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Machine frame |
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2
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Bearing ring |
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3
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Drive drum |
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4
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Main gear |
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5
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Inspection port |
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6
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Planetary gearbox |
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7
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Torque gauge assembly |
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8
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Primary gearmotor |
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| Model |
A
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B
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C
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D
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E
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Mounting1
Flange
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Weight
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in
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mm
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in
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mm
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in
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mm
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in
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mm
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in
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mm
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mm |
mm |
lb
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kg
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| DM075-A* |
42
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1,067
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44
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1,118
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5
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127
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12
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305
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32
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813
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32
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813
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1,900
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862
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| DM075-B* |
42
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1,067
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44
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1,118
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5
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127
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13.3
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337
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32
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813
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32
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813
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2,100
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952
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| DM100-B* |
54
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1,372
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54
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1,372
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5
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127
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13.3
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337
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35
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889
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42
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1,067
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3,300
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1,497
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| DM100-C* |
54
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1,372
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54
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1,372
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5
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127
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15.5
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394
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35
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889
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42
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1,067
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3,600
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2,633
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| DM150-C* |
76
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1,930
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76
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1,930
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7
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178
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15.5
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394
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35
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889
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62
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1,575
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5,500
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2,494
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| DM150-D* |
76
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1,930
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76
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1,930
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7
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178
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17.5
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445
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35
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889
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62
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1,575
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6,600
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2,993
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1 Maximum standard outside diameter of mounting flange. For larger flange sizes, contact factory.
Replace the * with the primary reducer option selected. |
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Features
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DBS DM Series pier mounted drive units provide very low maintenance and very high reliability. The heart of the DM series drive units is the composite bearing system that supports the main gear. This bearing system can operate with little or no lubrication and is unaffected by water contamination. In addition, the bearing is designed to last over 50 years! And, when service is required, the bearing can easily and economically be replaced in a few hours without removing the drive from the clarifier. All that is required is to remove the steel band that locates and retains the bearing elements.
Standard DM drives are 100% grease lubricated and require no maintenance for 5 years.
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FEATURES
- Specially designed for high corrosive environment, such as domed or covered clarifiers and thickeners, and industrial applications
- Low maintenance, every five years
- High tolerance to condensate buildup
- All helical or spur gear reductions for maximum mechanical efficiency
- Over load protection
- PV (pressure x velocity) value in excess of 10,000.
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Primary Speed Reducer Options
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 |
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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 |
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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 |
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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 |
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Stainless Steel Option
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DBS Manufacturing DM-Series pier-mounted stainless steel drive units are designed for operation in highly corrosive environments such as domed or covered clarifiers and thickeners, and industrial applications.
The heart of the DM-Series drive is a patent-pending main bearing that operates with little or no lubrication and is unaffected by water contamination. The bearing is designed to last over 50 years. When it is time for replacement the bearing can be easily removed and replaced without unbolting walkway bridges or the rake drive cage.
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The drive housing is fabricated to ASME quality standards from ASME A240 grade stainless steel. The torque control housing is stainless steel. A stainless steel electric motor is standard.
FEATURES
- Specially designed for high corrosive environment, such as domed or covered clarifiers and thickeners, and industrial applications
- Stainless steel machine frame
- Low maintenance
- High tolerance to condensate buildup
- All helical or spur gear reductions for maximum mechanical efficiency
- Torque overload protection with standard alarm, cutoff switches, and shear pin
Ordering Information
| Pier-Mounted Drive Unit Model Number–with Composite Main Bearing |
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Series
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Rake Gear
Pitch Dia. (mm) |
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Secondary
Speed Reducer |
Primary
Speed Reducer |
Number
of Pinions |
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DM
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075
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A
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E, F, W
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1 (omit)
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B
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100
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B
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E, F, H, W
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1 (omit)
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C
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150
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C
D
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E, F, H, W
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1 (omit)
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H
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2
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Example: Model DM075-AF
DDM is for a pier-mounted drive unit; 075 is the size of the final gear pitch diameter in mm; A is the size of the secondary speed reducer; F is the type of the primary reducer.
Standard Features
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Alarm and cutoff switches |
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2 O&M manuals on CD
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6" torque gauge indicating real torque (not available on H-type and W-type primary reducer) |
Optional Features
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4-20 mA torque transducer |
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Bi-directional operation (available for F and H-type primary reducers) |
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Variable speed
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Loss motion switch |
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Special electric motor |
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Oil heater (available for F and H-type primary reducers)
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Special coating
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Oil temperature switch
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Oil level switch
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Explosion proof switches |
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