Precision Standards for Drum Production Line

The precision standards for drum production lines involve multiple aspects, including geometric dimensions, installation positions, and motion characteristics, with specific requirements varying depending on the application scenario (e.g., belt conveyors, printing equipment, etc.). The following provides a comprehensive reference based on common standards.

Geometric dimensions and machining accuracy

- Diameter accuracy: The machining error of the roller's outer diameter is typically required to be controlled within ±0.01mm to ensure uniform rotation and transmission stability.

- Coaxiality: The coaxiality error between the drum shaft center and the outer circle center must be strictly controlled. For example, the concentricity deviation should not exceed 0.02mm to prevent wobbling during rotation.

- Surface finish: After machining the outer circle, the surface roughness must reach▽5 or higher, with critical areas (such as bearing mounting locations) achieving▽7 to reduce friction and wear.

- Wall thickness uniformity: For hollow drums, the wall thickness difference must be controlled within 50–100 grams. Dynamic balancing adjustments are required to ensure weight equilibrium and prevent vibration during high-speed operation.

Installation Position Accuracy

- Centerline alignment: The misalignment between the transverse centerline of the roller and the longitudinal centerline of the conveyor generally does not exceed 2–5mm, depending on the equipment type (e.g., coal belt conveyors require ≤2mm).

- Levelness: The deviation of the horizontal levelness of the roller shaft centerline shall be ≤0.5mm/m (or ≤0.1‰), commonly measured with a spirit level or level gauge.

- **Verticality**: The deviation of the roller shaft centerline from the belt conveyor centerline is typically required to be ≤0.5mm/m, which can be inspected using the string line method and a square.

- Elevation deviation: The allowable deviation for the centerline elevation is ±10mm, measured with common glass leveling tubes or leveling instruments.

Motion and Balance Precision

- Dynamic balancing: The high-speed running roller must meet dynamic balancing requirements, with a runout error controlled within 50–100g, to prevent vibration from affecting equipment lifespan and product quality.

- Straightness: The straightness of the frame centerline shall have a deviation ≤5mm within any 25m length, and the verticality deviation of the support legs shall be ≤2/1000.

Testing Methods and Equipment

- Common tools: steel ruler, spirit level, leveling instrument, glass leveling tube, square, etc.

- Detection methods: Include the pull-line method, measurement method, horizontal measurement method, etc., with specific selection based on precision requirements.

Scenario Differences

- Belt Conveyor: Focus on installation alignment and levelness, such as spacing error between rollers and idlers ≤1.5mm.

- Printing equipment (e.g., gravure cylinders): Requires higher precision, such as a screen cell parameter control resolution of over 5000 dpi and a color difference ΔE ≤ 1.2.

In actual production, the standards must be adjusted according to specific process requirements and regularly calibrated to ensure long-term stability.