Crane Configuration for Rubber & Tire Manufacturing
Crane configuration for the rubber and tire manufacturing industry must address two key challenges: carbon black dust in the mixing room and high-temperature die changes in the curing room. For the mixing room, we recommend totally enclosed motors with positive-pressure dustproof electric control cabinets (for carbon black dusty environments). For the curing room, we recommend an LD overhead crane (3–10 t) paired with a BZD jib crane (2–5 t) for rapid die changes. Kelude's rubber-industry cranes are already in service at multiple tire plants.
The rubber and tire manufacturing industry — covering passenger, truck, OTR tires, and rubber goods — relies on lifting equipment throughout the full production chain, from mixing to curing, for equipment maintenance and material handling. Each stage presents its own challenges: heavy carbon black dust in the mixing room, high ambient temperatures in the calendering area, and hydrogen sulfide fumes in the curing room. Every work cell imposes special requirements on crane protection. Tire dies (segmented and two-piece types) weigh between 0.5 and 10 t, and precise lifting and transport is essential when changing dies on vulcanizing presses. This article provides crane configuration solutions for the four key processes: mixing, calendering, building, and curing.
Rubber & Tire Crane Configuration Comparison
| Comparison Parameter | Internal Mixing Workshop | Calendering Workshop | Building Workshop | Curing Workshop |
|---|---|---|---|---|
| recommended model | TEFCDustproof LD/QDoverhead type | LD/LH Typeoverhead type+Temperature Resistance | LD Typeoverhead type+KBK | LDoverhead type+BZDjib crane |
| Lifting Capacity Scope | 10~32t | 5~16t | 3~10t | 3~10t+2~5tCantilever |
| guards Key Focus | Carbon Black Dust IP54+TEFC | High Temperature60~80°C+Calender Oil | No Special Requirement | High Temperature+die Quick Change |
| Motorrequirements | Totally Enclosed Self-Cooled TEFC | FClassinsulation | Standard | FClassinsulation |
| Lifting and transport Subject | Carbon Black/Raw Rubber/Rubber Sheet | roller/Cord Fabric/Steel wire | Green Tire/Building Drum | die/Finished Tire |
| reference price | 15~5010,000 CNY | 8~2010,000 CNY | 5~1510,000 CNY | 8~1410,000+2~510,000/Unit(s) |
Overhead Cranes for Mixing Rooms: Carbon Black Dust Environments
Mixing rooms, where carbon black, raw rubber, and compounding ingredients are processed in internal mixers, open mills, and batch-off cooling lines, present a challenging environment. Carbon black is a conductive dust, with concentrations typically ranging from 5 to 50 mg/m³. This requires specialized protection for all electrical equipment:
- Recommended Model: LD/LH type overhead crane (5–16t), Work Duty A4~A5, Span 18–24m.
- Carbon Black Dust Protection: The electric control cabinet is rated IP55 with a positive pressure dustproofing system to prevent dust ingress. Motors are TEFC (Totally Enclosed Fan Cooled) with cooling fins and dust covers. All electrical connections are sealed.
- Anti-Static Measures: Given that carbon black is conductive (resistivity approx. 10⁵–10⁸ Ω·cm), the crane's grounding resistance must be ≤1Ω to prevent static charge buildup and potential sparking.
- Reference Price: LD type 10t/22m with dust protection: approx. $18,000–$27,000 USD.
Vulcanizing Shop Cranes: Dedicated Mold Change Solutions
The vulcanizing shop is the core of tire manufacturing, where green tires are cured under heat and pressure in vulcanizing presses. Each press uses a specific mold (e.g., segmented or two-piece), weighing between 0.5 and 10t. This area is characterized by high ambient temperatures and corrosive curing fumes, demanding cranes with exceptional heat resistance and anti-corrosion properties.
- Recommended Configuration: A combination of an LD type single-girder bridge crane (3–10t) for long-distance travel along the mold changing aisle, and BZD type column-mounted jib cranes (2–5t) installed at each press for local, short-distance mold handling.
- High-Temperature & Corrosion Resistance: With press surface temperatures reaching 80–120°C and fumes containing corrosive agents like hydrogen sulfide, it's advisable to locate the crane's control cabinet outside the immediate vulcanizing area or use an IP55-rated stainless steel cabinet. Cables should have oil-resistant and anti-corrosive outer sheaths, and wire ropes should be galvanized for rust prevention.
- Efficient Mold Changes: Molds may be changed 1–2 times per press per shift, directly impacting production efficiency. The LD bridge crane transports the new mold from the storage area to the press aisle, while the BZD jib crane positions it onto the press worktable. This coordinated system reduces the entire mold change cycle to approximately 30–60 minutes, saving over 50% of the time compared to using only a forklift truck.
- Reference Price: LD type 5t/18m: approx. $12,000–$21,000 USD. BZD jib crane 3t: approx. $3,000–$7,400 USD each. For 20 presses, this configuration represents a total investment of roughly $71,000–$169,000 USD.
Calender Shop Cranes: High-Temperature Protection
Calender shops house large machines like calenders used for sheeting rubber or applying it to fabric or steel cord. These machines have massive components, with rolls weighing 5–15t each and frames weighing 30–80t, requiring cranes for assembly and maintenance. The environment is hot (60–80°C) and often contaminated with oil near the calenders.
- Recommended Model: LD/LH type overhead crane (5–16t), Work Duty A4~A5, Span 18–24m. Equipped with variable frequency micro-speed drive (0.5–2 m/min) for precise roll installation.
- High-Temperature Configuration: Motors should have Class F insulation (rated for 155°C). The control cabinet should be IP54 rated and ideally located in cooler zones away from the main heat sources of the calender.
- Handling Requirements: Primarily used for lifting and transporting calender rolls, frames, and other components, as well as handling fabric and steel cord rolls during loading and unloading.
- Reference Price: LD type 10t/22m: approx. $12,000–$30,000 USD.
Building/Assembly Shop Cranes: Green Tire Handling & Support
The building shop, where tires are assembled, is the most automated stage in tire manufacturing. Building machines typically have integrated systems for green tire removal and tipping. Overhead cranes here are mainly required for equipment maintenance and material rack handling.
- Recommended Model: LD type single-girder bridge crane (3–10t), Work Duty A4~A5, Span 16–22m, with two-speed hoisting (5/0.8 m/min).
- Green Tire Handling: Green tires (weighing 10–80kg each depending on size) are usually transferred to inspection stations via automated conveyor lines. The crane serves as a backup for equipment failure or production changeovers.
- Material Rack Logistics: Given the high volume of moving racks for rubber sheets, bead wire, and ply, we recommend installing a KBK suspension system with 0.5–2t chain hoists in the rack storage area for efficient loading and unloading.
- Reference Price: LD type 5t/18m: approx. $7,400–$22,000 USD. KBK system with 0.5t hoist: approx. $3,000–$7,400 USD per unit.
Kelude's Service Advantages for the Rubber & Tire Industry
- Carbon Black Dust Protection Solution: Kelude's electrical solutions for mixing rooms, proven in numerous tire plants, combine TEFC motors, positive pressure control cabinets, and stainless steel dust covers. This system ensures reliable continuous operation in environments with carbon black concentrations above 10 mg/m³, extending motor life from 6–12 months to 3–5 years and reducing control cabinet failure rates by approximately 80%.
- Integrated Mold Change System: Our combined solution for vulcanizing shops (LD bridge crane 3–10t + BZD jib cranes 2–5t) is already in use at several tire factories. The LD crane handles long-distance mold transport, while the BZD jib crane manages the final positioning at the press. This system cuts mold change times by about 40% and is more cost-effective than equipping the entire bay with bridge cranes.
- Explosion-Proof Capabilities: Kelude can engineer comprehensive explosion-proof solutions for tire plants based on hazardous area classification. This includes solutions for solvent warehouses (Ex d e mb IIB T4) and cement preparation rooms (Ex d e mb IIB T3). Explosion-proof cranes typically cost 1.5 to 2 times more than standard models, significantly mitigating safety risks associated with carbon black dust and solvent vapors.
FAQ
Q: How does carbon black dust in a mixing room affect the motor?
A: Carbon black dust is conductive. When drawn into the motor by the cooling fan, it accumulates on the rotor end rings and stator winding surfaces, reducing Insulation Resistance and potentially causing turn-to-turn short circuits or ground faults. It also blocks ventilation passages, leading to excessive temperature rise and accelerated insulation Aging. Kelude recommends TEFC (Totally Enclosed Fan-Cooled) motors for mixing rooms—they have no external fan to ingest dust—and retrofitting the cooling fins with a stainless steel dust cover. With these measures, motor service life in carbon black environments extends from 6–12 months to 3–5 years.
Q: For die changes in a curing shop, should we use an LD bridge crane or a BZD jib crane?
A: In a tire curing shop, the mold access system runs between two rows of vulcanizing presses. The recommended solution is to install an LD type single-girder bridge crane (3–10t) above the access system to transport molds along the aisle to any press. Then, equip each press with a BZD column-mounted jib crane (2–5t) for the short-distance die change. The LD bridge crane handles long-distance Lifting and transport, while the jib crane handles positioning at the press—this combination is more economical than equipping the entire bay with bridge cranes.
Q: What special protection does the electrical system need in a mixing room?
A: Mixing rooms have high carbon black concentrations and high Ambient Temperature. Special requirements for the electrical system include: a positive-pressure dustproof electric control cabinet rated IP54 or higher, VFDs derated by 20%–30% above 40°C, IP67 waterproof connectors, and control cables with oil-resistant, heat-resistant outer sheath. Kelude's standard mixing-room control cabinet features positive-pressure dustproofing plus water cooling, ensuring long-term stable operation in environments with carbon black concentrations above 10 mg/m³.
Q: Do cranes in the rubber tire industry need to be explosion-proof?
A: Most areas of a tire manufacturing plant have no explosion-proof requirements. However, the solvent warehouse and the cement mixing room are classified as explosive hazardous areas—solvent vapors (gasoline/toluene/xylene) can reach the Lower Explosive Limit (LSB). The solvent warehouse requires an Explosion-Proof Crane rated Ex d e mb IIB T4, while the cement mixing room requires Ex d e mb IIB T3. Explosion-proof cranes typically cost 1.5–2 times more than Standard models.
