What is a Crane Spreader?
A crane spreader is a lifting attachment that connects to an overhead crane’s hoist. Its primary function is to distribute the lifting force evenly across a load, preventing damage and ensuring stability. In paper mills, these spreaders are custom-designed to handle specific load types, primarily large, heavy, and often delicate rolls of paper.
Bridge crane spreader for paper mill
Key Functions and Applications of Paper Mill Spreader Beams
1. Handling Finished Paper Rolls:
This is the most common and critical application. Finished paper rolls, also known as parent rolls or jumbo rolls, are extremely heavy (weighing several tons), have a precise cylindrical form, and have finished surfaces that must remain unblemished.
- How the Spreader Works: A paper roll spreader typically features self-centering, adjustable hydraulic arms that grip the core of the roll from the inside. This “core-gripping” or “mandrel” design ensures that the compressive force of lifting is applied to the strong cardboard core, not the delicate paper surface, eliminating any risk of crushing or denting.
- Location: Used in the final stages of production to move rolls from the winder to wrapping stations, storage, and eventually onto trucks or railcars for shipment.
2. Handling Pulp Bales and Raw Materials:
Paper mills process vast quantities of raw materials like wood pulp, which is often compressed into large, dense bales for transport and storage.
- How the Spreader Works: For this application, spreaders are equipped with multiple gripper claws or a “squeeze-type” mechanism that can securely clamp the entire bale. These spreaders are built for extreme durability to handle the abrasive and sometimes harsh nature of raw materials.
3. Roll Turning and Positioning:
Paper rolls often need to be rotated for inspection, feeding into a machine, or repackaging.
- How the Spreader Works: Advanced spreaders are equipped with a rotating head or “tilter” that allows the crane operator to precisely rotate the roll 90 nebo 180 degrees while it is suspended, all with simple controls from the crane cabin.
4. Storage and Warehouse Management:
Modern paper mill warehouses are high-density, with rolls stored in tight rows, often several levels high.
- How the Spreader Works: Spreader beams enable precise placement and retrieval of rolls in these congested areas. Their stability prevents swinging, allowing operators to slot rolls into position with millimeter accuracy, maximizing storage space.
Crane J type spreader for paper mill
Crane Spreader For Paper Mill Equipment Parameters
| Category |
Parametr |
Value & Unit |
| Core Performance |
Rated Capacity |
20 tonnes (SWL), Customizable |
| Self-Weight |
~2.5 tonnes |
| Duty Class |
FEM 2m / ISO M6 |
| Geometric Dimensions |
Adjustable Load Width Range |
1500mm to 3500mm |
| Adjustable Load Core Diameter Range |
Adjustable Load Core Diameter Range |
| Spreader Length |
3800mm |
| Spreader Width |
1200mm |
| Spreader Height |
850mm |
| Mechanical & Structural |
Rychlost zvedání (Hoisting/Lowering) |
0-8 metres per minute |
| Traverse Speed (Long Travel) |
0-20 metres per minute |
| Structural Safety Factor |
4:1 (FEM Standard) |
| Main Frame Material |
High-Strength Steel S355JR |
| Power & Control |
Napájení |
400Volts / 50Hertz |
| Režim řízení |
Radio Remote Control |
| Enclosure Protection Rating |
IP65 |
| Hydraulic System Working Pressure |
220 bar |
| Functional Features |
Jaw Opening/Closing |
Hydraulic Synchronous |
| Maximum Clamping Force |
30 kiloNewtons |
| Head Rotation (Tilting) Range |
±180 degrees |
| Integrated Weighing System Accuracy |
±0.5% Full Scale |
| Bezpečnost & Environment |
Operating Temperature Range |
-20°C to +50°C |
| Relative Humidity |
Up to 95% non-condensing |
Crane spreader for paper mill
Crane Spreader For Paper Mill Customization Services
We provide comprehensive engineering-to-order services to deliver a spreader solution perfectly tailored to your unique operational needs.
1. Application-Specific Design
- a. Custom Attachments: Engineering of specialized attachments for your specific load (NAPŘ., core grippers for paper rolls, C-hooks for coil, vacuum lifters for sheets, grabs for bales).
- b. Structural Adaptation: Modifying the spreader’s geometry and strength to fit your existing crane hook height, runway span, and clearances.
2. Functional Customization
- a. Integrated Rotation: Adding motorized rotation units for precise load positioning (±180° or continuous 360°).
- b. Automatic Centering: Self-adjusting arms that automatically center the spreader on the load’s center of gravity.
- c. Weighing & Data Logging: Embedding scales and RFID technology to weigh loads and track them in your Warehouse Management System (WMS).
- d. Full Automation: Enabling seamless integration with plant automation systems for unmanned operation.
Customized crane spreader for paper mill
3. Control & Interface Customization
- a. Control Options: Offering pendant, cabin, radio remote, or fully automated control systems.
- b. Data Connectivity: Providing interfaces (NAPŘ., PROFINET, Ethernet/IP) for real-time data exchange with your IoT and monitoring platforms.
- c. Human-Machine Interface (HMI): Customizing display units to show critical data like load weight, clamp pressure, and battery status.
4. Bezpečnost & Compliance Customization
- a. Environmental Adaptation: Designing for harsh conditions (NAPŘ., corrosion-resistant coatings, certified explosion-proof (ATEX) components, high-temperature paints).
- b. Redundant Safety Systems: Implementing duplicate hydraulic holding valves, dual emergency stop circuits, and overload protection.
- c. Zone Protection: Integrating laser scanners or anti-collision systems to define safe working areas.
5. Project & Support Services
- a. Site Survey & 3D Scanning: Conducting precise on-site measurements to ensure perfect fit and avoid interference.
- b. Factory Acceptance Test (FAT): Inviting clients to witness testing and approve the equipment before shipment.
- c. Installation & Commissioning: Providing expert supervision for on-site setup and operational qualification.
- d. Výcvik & Dokumentace: Delivering comprehensive operator and maintenance training, along with detailed multilingual manuals.
- e. Long-Term Service Agreements: Offering planned maintenance and remote support packages to ensure maximum uptime.
Our customization process ensures your spreader is not just a lifting device, but a integrated, efficient, and safe solution that enhances your productivity.
Double girder bridge crane spreader for paper mill
Design Features of a Modern Paper Mill Spreader
- 1. Hydraulic Systems: Provide the powerful, controlled clamping force needed for secure lifting without shock loads.
- 2. Self-Leveling & Automatic Centering: Ensures the load is always lifted evenly, maintaining balance and safety.
- 3. Adaptability: Adjustable arms can handle a wide range of roll diameters and widths, increasing flexibility.
- 4. Integrated Automation: Many modern spreaders can interface with the mill’s Warehouse Management System (WMS). They can automatically identify roll dimensions and weights via RFID tags or barcodes, directing the crane to the correct storage location.
- 5. Safety Systems: Load moment indicators (LMI), anti-sway systems, and overload protection are standard to prevent accidents.
Benefits of Using Specialized Spreader Beams
- 1. Enhanced Product Quality: Eliminates damage to roll edges and surfaces, directly protecting the mill’s valuable product and reducing financial loss.
- 2. Increased Operational Efficiency: Allows for faster lifting, moving, and positioning cycles compared to slings or chains. This speeds up production and shipping timelines.
- 3. Improved Safety: Removes the need for workers to be on the ground to attach slings. The secure, automated grip significantly reduces the risk of load drops, creating a safer work environment.
- 4. Reduced Labor Costs: One crane operator can handle tasks that would otherwise require multiple ground crew members.
- 5. Optimized Storage: Enables high-bay, high-density storage, making the most of the available warehouse footprint.
výrobce
The Crane Spreader for Paper Mill is a quintessential example of how specialized lifting equipment solves industry-specific challenges. It is far more than a simple lifting device; it is an integral component of the paper production and logistics chain. By ensuring the safe, efficient, and damage-free handling of delicate and heavy rolls, these sophisticated spreader beams protect assets, boost productivity, and uphold the stringent quality standards demanded by the global paper industry. Investing in the right crane spreader technology is a strategic decision for any mill aiming for operational excellence.
