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| Illustration 1 | g06131390 |
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Vibratory Pod for Five-amplitude System (1) Eccentric weight (outer) (2) Shaft bearings (3) Amplitude selection wheel (4) Sight gauge (5) Indicator (6) Spring and coupling (7) Eccentric weight housing (8) Output shaft (vibratory motor) (9) Eccentric weight (inner) | |
The drum contains two eccentric weights (1) and (9). The weights are located in eccentric weight housing (7) inside the drum. The eccentric weight housing is sealed. The eccentric weights are connected to output shaft (8) of the vibratory motor.
When the vibratory system is operating, output shaft (8) from the vibratory motor rotates two eccentric weights (1) and (9). Since the center of gravity of the eccentric weights is not at the center of the output shaft, the eccentric weights form an imbalance. The weight imbalance causes the drum to vibrate when the weights are rotating.
On machines with five-amplitude vibratory systems, two eccentric weights (1) and (9) are mechanically interlocked and held in place by spring and coupling (6). The orientation of the weights relative to each other determines the vibratory amplitude. The following five amplitudes are possible:
- Low amplitude
- Medium-low amplitude
- Medium amplitude
- Medium-high amplitude
- High amplitude
Rotation of eccentric weight (1) and (9) places shaft bearings (2) under a high load. The high load creates the need for constant lubrication. The bearings are splash lubricated with oil inside eccentric weight housing (7). The housing contains sight gauge (4) to indicate the oil level. The sight gauge is located on the same side of the drum as amplitude selection wheel (3). To check the oil level, the drum must be rotated until indicator (5) is in the lowest position. The oil should be visible across the midpoint of the sight gauge.
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| Illustration 2 | g06131391 |
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Eccentric Weights (1) Eccentric weight (outer) (3) Amplitude selection wheel (9) Eccentric weight (inner) | |
Amplitude selection wheel (3) is connected to inner eccentric weight (9). The selection wheel is located on the opposite side of the drum from the vibratory motor (on the same side as the propulsion motor).
When amplitude selection wheel (3) is pulled out, the coupling between the two weights is released. When the coupling is released, the amplitude selection wheel can be rotated to change the orientation of inner eccentric weight (9). When the wheel is returned to the locked position, the coupling is engaged and the weight is locked in position.
When eccentric weight (1) and (9) are aligned on the same side of the output shaft, rotation of the weights creates the highest amplitude. A 180-degree offset creates the lowest amplitude. Offset angles between zero and 180 degrees create medium amplitude settings. The greater the offset angle, the lower the amplitude.