Double girder
overhead cranes serve as core material-handling equipment in paper mill workshops and finished-product warehouses. They are primarily used for tasks such as raw material handling, equipment installation and maintenance, paper roll lifting, pulp processing equipment maintenance, and the transfer of heavy components along the production line. Unlike standard
overhead cranes, these units must maintain stability and reliability under harsh operating conditions characterized by high temperatures, high humidity, and continuous operation. As a leading Chinese manufacturer of
overhead cranes, Weihua Group offers specialized double-girder bridge crane solutions tailored to the specific facility layout, production processes, and lifting requirements of each client's paper mill.
Operating Environment and Working Conditions for overhead cranes in Paper Mills
Paper production workshops are characterized by hot and humid conditions; equipment surface temperatures can range from 30°C to 100°C, ambient temperatures often reach 40°C to 45°C, and relative humidity generally exceeds 90%—approaching saturation in the "wet end" areas. Continuous operation of paper machines generates significant electromagnetic interference. Furthermore, the handling of paper rolls demands both high efficiency and low-speed, precision positioning, placing extremely high requirements on the stability of the bridge crane equipment.
Typical Configuration and Selection of Double Girder Cranes for Paper Mills
Double-girder cranes in paper mills typically feature a dual-trolley or triple-trolley configuration: the dual-trolley setup handles routine paper roll lifting, while the triple-trolley arrangement accommodates both routine handling and tasks such as paper machine maintenance and component replacement. Specialized paper roll lifting devices (such as roll clamps) are attached to the hooks to ensure the rolls remain undamaged during transport. Lifting capacity is generally determined by the weight of the paper rolls plus a 15%–20% safety margin, with a common range of 16 to 50 tonnes.
Hoisting and travel mechanisms commonly utilize variable-frequency drive (VFD) systems to enable soft starts and stops as well as multi-speed control. Wireless remote control is the preferred operating method; this avoids line-of-sight obstructions caused by an operator's cab hanging over the paper machine and allows operators to move alongside the paper rolls during handling.
Applications of Double Girder Cranes in Paper Mills
Double girder bridge cranes are utilized across various areas of a paper mill: the pulping workshop for hoisting raw materials and equipment; the paper machine maintenance area for installing heavy components such as drying cylinders and press rolls (cranes with capacities of 20–50 tons and slow-speed inching capabilities are recommended); and the finishing workshop and finished-product warehouse for the loading, unloading, and stacking of paper rolls.
What parameters need to be confirmed for project selection?
If you are inquiring about a double girder bridge crane solution for a paper mill, it is recommended to provide the following parameters to Weihua's official sales team:
| Parameter |
Required Information |
| Rated lifting capacity |
e.g., 10t, 20t, 32t, 50t |
| Span |
Distance between the centerlines of the rails on both sides |
| Lifting height |
Height to which the hook needs to be raised |
| Duty class |
Determined based on daily operating hours, frequency of use, and load conditions |
| Application area |
Paper workshop, pulp workshop, equipment maintenance area, etc. |
| Power supply parameters |
Voltage, number of phases, frequency |
| Special requirements |
Anti-corrosion, moisture resistance, variable frequency drive (VFD), specialized paper roll spreader, etc. |
