What are the operating regulations for a double-drum roller?
2023-01-31 17:20
Construction machinery such as double-drum rollers is capital‑intensive, highly technology‑driven, and closely linked to related industries. With a broad technological scope and diverse business lines, as the technological sophistication of OEMs continues to rise, double-drum rollers rely on close collaboration with numerous component suppliers; roughly 60% to 70% of the supporting parts must be sourced directly from these suppliers. Roller manufacturing primarily encompasses overall product design, fabrication of structural components, procurement of spare parts, and final assembly.
What are the operating regulations for a double-drum roller?
1. During operation, the drum must start first before vibration can be initiated; the internal combustion engine should first reach medium speed, after which the high speed can be adjusted.
2. When shifting gears or changing the transmission, first bring the vehicle to a stop; during gear changes, reduce the engine speed.
3. It is strictly prohibited to vibrate the roller on hard flooring.
4. When compacting soft subgrades, first apply no vibration; compact 1–2 times, then proceed with vibration.
5. The rolling and vibration frequencies must be consistent. If the vibratory roller is adjustable, first set the vibration frequency before starting operation; do not adjust the vibration frequency when the machine is not vibrating.
6. Adjustment of the reversing clutch, impact clutch, and brake shall be performed after the main clutch has been disengaged.
7. Do not use the fast‑forward mode when moving up or down slopes. When making sharp turns, it is strictly prohibited to engage the fast gear while rolling on small‑wheel rollers, including articulated vibratory rollers.
8. Do not engage the vibration function when the roller is traveling at high speed.
9. When shutting down, first stop the vibration, then position the mechanism in the neutral (center) position, set the transmission to neutral, pull the parking brake lever, and after idling the internal‑combustion engine for a few minutes, shut it off.
10. Other work requirements shall comply with the specifications for the static-pressure roller.
Whether ascending or descending, the underlying layer beneath the asphalt mixture must be clean and dry, and an asphalt tack coat should be applied to prevent slippage when the mixture is subjected to compaction.
Whether on an uphill or downhill grade, the roller’s drive wheel should always be positioned at the rear. This arrangement offers the following advantages: on an uphill grade, the rear drive wheel can withstand both the slope and the tractive force generated by the machine itself, while the front wheel initially compacts the pavement to absorb the substantial shear forces produced by the drive wheel. On a downhill grade, the impact forces resulting from the roller’s own weight are counteracted by the braking action of the drive wheel, leaving only the mix pressed against the front wheel capable of providing the necessary support for the rear drive wheel to generate shear forces.
When compacting on an uphill grade, the roller should maintain steady acceleration, deceleration, and stopping; avoid operating at excessively high or low speeds.
Before uphill rolling, cool the mixture to the specified lower limit temperature, then perform static pre‑compaction using vibratory compaction until the mix temperature drops to the lower limit (120°C).
When descending, avoid sudden gear changes and braking.
When compacting on very steep slopes, begin with a light‑weight roller for preliminary compaction, followed by a heavy‑weight roller or a vibratory roller for final compaction.
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