Single-girder Crane in the papermaking workshop: millimeter-level precision, supporting the lifeblood of paper roll production

Amid the roar of the papermaking workshop, giant paper rolls, two meters in diameter and weighing five tons, await connection to the rewinder. Even a 5mm misalignment could render the entire roll scrapped due to uneven edges. Traditional forklifts' friction with the ground and poor positioning, coupled with the chronic corrosion of equipment by damp paper dust, further hamper production line efficiency. The papermaking-specific single-girder overhead crane, with its customized design featuring spatial adaptability, micron-level control, and corrosion and dust resistance, lays the foundation for precise handling in roll paper production.

Technical Parameters:

I. Solving the Three Major Handling Pain Points in Papermaking Workshops

1. Spatial Dilemma: Equipment Crowded Like a "Maze"

In papermaking workshops, papermaking machines, rewinders, and storage racks are closely spaced, making the bulky size of traditional double-girder cranes highly susceptible to collisions. The single-girder overhead crane breaks new ground with its "single main girder lightweight structure":
Its deadweight is 35% lighter than double-girder cranes, and it offers flexible adaptability for spans from 7.5 to 20 meters. Tracks are laid along the factory building columns, leaving 30% of the floor space for operation on the production line.
The lifting height is adjustable from 6 to 25 meters, making it easy to lift paper rolls across equipment floors and avoiding the inefficiency of "ground detours."
2. Accuracy is a lifeline: A millimeter error = entire roll scrapped.
When paper rolls are docked with the rewinder, axial misalignment greater than 3mm will cause wrinkles at the roll edge. The single-girder overhead crane is equipped with:
A servo variable frequency control system with stepless adjustment of lifting and traversing speeds from 0.1 to 10 m/min and a positioning accuracy of ±2mm, acting like a "laser ruler" for the hook.
Customized V-shaped hooks conform to the curvature of the paper roll shaft head, automatically aligning during lifting and preventing damage from "slanting" or "slanting" lifts. 3. Environmental Corrosion: The "Double Corrosion" of Humidity and Paper Dust
The humidity in the pulp mill exceeds 80%, and paper dust permeates every pore. Traditional equipment is prone to short circuits, steel structure corrosion, and bearing seizure. The single-girder crane's "protective armor":
The main beam is treated with hot-dip galvanizing and epoxy sealant, and has passed the salt spray test for over 1500 hours, preventing rust even from pulp splashes.
The electrical cabinet adopts an IP55 sealed design with built-in positive pressure ventilation, preventing paper dust and moisture from entering.
The pulley block is equipped with a dust cover, and the bearing grease nipples are exposed, allowing for regular maintenance without disassembly. II. "Precision Handling Nodes" Throughout the Papermaking Process
1. Raw Material Stage: From Forced Feeding to Precise Feeding
When lifting 5-ton pulp tanks, the hook is equipped with an anti-sway lock function, ensuring that the liquid level sways ≤5cm when pouring the pulp, preventing spillage and contamination.
When handling wood pulp boards/chemical pulp bales, a combination of electric suction cups and flexible slings ensures a stacking error of ≤5mm, increasing storage area utilization by 20%.
2. Production Stage: Millimeter-Level Surgery for Paper Roll Connections
When receiving 2.5-meter-diameter, 8-ton wet paper rolls from the paper machine, the lifting process automatically avoids water splash zones to prevent moisture and deformation.
When transferring finished paper rolls to the rewinder, the hook is equipped with a built-in laser alignment system for automatic alignment with the rewinder shaft head, reducing connection time from 5 minutes to 90 seconds. 3. Maintenance: "Efficient Support" for Equipment Maintenance
When hoisting a paper machine drying cylinder (weighing 10 tons), dual hooks are lifted synchronously with a horizontal deviation of ≤1mm to prevent cylinder tilt and damage to seals.
When replacing rewinder blades (accuracy ±0.01mm), the overhead crane is equipped with a "slow descent" function, with a drop speed of 0.05m/min, to prevent collisions and chipping.

III. Data Witness: The "Value of Single-Girder Overhead Crane"

Efficiency Leap: Paper roll handling time is reduced by 40%, and daily production capacity is increased by 12% (based on a 300-ton/day production line).

Quality Protection: The paper roll damage rate has been reduced from 3.2% to 0.3%, reducing scrap losses by over 500,000 yuan annually.

Cost Optimization: The corrosion-resistant design reduces equipment maintenance frequency by 60%, and the intelligent early warning system reduces unplanned downtime by 85%. In the papermaking workshop, the single-girder overhead crane is the "precision bodyguard of roll paper"—its spatial adaptability breaks layout constraints, its micron-level control safeguards product quality, and its corrosion-resistant intelligence extends equipment life. As giant rolls of paper rotate smoothly beneath the hook, every lift, from raw material to finished product, contributes to a triple evolution in efficiency, quality, and cost, ensuring that the lifeline of papermaking remains taut with precision.