LB Type Explosion-Proof Electric Single-Girder Crane
1. Product Overview
The LB Type Explosion-Proof Electric Single-Girder Crane is a specialized lifting device designed in accordance with GB3836.1-2000 (Explosive atmospheres – Electrical apparatus – General requirements) and GB3836.2-2000 (Explosive atmospheres – Electrical apparatus – Flameproof enclosure "d"). It is paired with the HB(BCD)/HBS(BMD) Type Explosion-Proof Electric Hoist and offers a lifting capacity of 1 to 20 tons. The key difference from a standard LD Type Single Girder Crane is that the entire unit uses flameproof electrical equipment, the wheel blocks feature stainless steel treads or nylon wheels to eliminate running sparks, and the control voltage is a safe AC 36V. With an explosion proof marking of ExdeibIICT4/DIPA21TA, it is suitable for Zone 1 and Zone 2 areas with IIB or IIC explosive gas atmospheres, as well as dusty environments, commonly found in military, petrochemical, chemical, coal mining, and pharmaceutical industries where flammable and explosive materials are handled.
2. Specifications & Models
- Model: LB Type
- Specification: 1t, 2t, 3t, 5t, 10t, 16t, 20t
- Span: 6m, 10m, 15m, 17m, 19.5m, 20m, 21m, 22.5m, 25.5m, 30m (customizable)
- Effective Lifting Height: 6m, 9m, 12m, 18m, 24m, 30m (customizable)
- Work Duty: A3, A4, A5
- Working Environment: -25℃ to +40℃
Product Image
3. Technical Parameters
- Hoisting Mechanism: BCD Type, BMD Type, HB Type Explosion-Proof Electric Hoist
- Lifting Spreader: Hook (non-standard designs available)
- Explosion Protection Class: Level 3, Level 4, Coal Mine Safety Type
- Explosion Proof Marking: ExdeibIICT4/DIPA21TA, T4
- Power Supply: 3-Phase 380V / 660V / 1200V 50Hz
- Control Voltage: AC 36V Safety Voltage
- Rated Duty Cycle: 10 min, 25% base duty cycle
- Equivalent Starts: Max. 120 starts/hour
4. Explosion Protection Class & Applicable Areas
The LB Type Explosion-Proof Electric Single-Girder Crane carries the explosion proof marking ExdeibIICT4/DIPA21TA, T4. It is designed for use in factory areas where explosive gas atmospheres formed by flammable gases or vapors with air, not exceeding explosion group IIB or IIC and with an ignition temperature class of T4 (135℃) or higher, may exist. It is also suitable for areas with combustible dust.
Applicable Zone Classification:
- Zone 1: Areas where an explosive gas mixture is likely to occur during normal operation.
- Zone 2: Areas where an explosive gas mixture is not likely to occur during normal operation, but if it does, it will only exist for a short time.
- Dusty Environment Service: DIPA21TA, suitable for areas where combustible dust is present.
- Note: This product is NOT suitable for Zone 0 – areas where an explosive gas mixture is present continuously, frequently, or for long periods.
Applicable Standards:
- GB3836.1-2000 "Electrical apparatus for explosive gas atmospheres – General requirements"
- GB3836.2-2000 "Electrical apparatus for explosive gas atmospheres – Flameproof enclosure 'd'"
- GB3836.3-2000 "Electrical apparatus for explosive gas atmospheres – Increased Safety 'e'"
- GB12476.1-2000 "Electrical apparatus for use in the presence of combustible dust"
Structural Diagram
5. Application Scope
The LB Type Explosion-Proof Electric Single-Girder Crane is designed for hazardous areas within factories where explosive gas or combustible dust mixtures may be present. It is widely used in the following industries:
- Military & defense facilities
- Petroleum & petrochemical
- Coal mining (Coal Mine Safety Type)
- Chemical & pharmaceutical plants
- Aerospace & paint finishing
- Warehouses and workshops with flammable or explosive gases or dust
6. After-Sales Service
The LB Type Explosion-Proof Electric Single-Girder Crane is warranted against quality-related defects for one year from the date of sale under normal use conditions. For products beyond the warranty period (excluding those that are irreparable), our company provides repair services, charging only for the cost of replacement parts.
Price Reference (for budgeting): LB-type explosion-proof overhead crane pricing is calculated based on explosion protection class and lifting capacity. A 5-ton model with a 10-meter span runs approximately 35,000–60,000 RMB, while a standard LDA Type of the same capacity costs around 20,000–40,000 RMB. The explosion-proof hoist and flameproof enclosure are the main cost drivers; opting for coal-safety certified versions adds roughly 30% to the price. Kelude Heavy Industry sells factory-direct — even single units are priced at wholesale.
Availability & Delivery: BCD-type explosion-proof hoists and flameproof control boxes are kept in stock — shipment takes 7–10 days after parameter confirmation. Customized non-standard units ship within 15–20 days. Every unit undergoes individual explosion-proof performance testing before leaving the factory.
Key Considerations When Buying an Explosion-Proof Crane
Explosion-proof overhead cranes follow a different selection logic than standard ones. Here are the common pitfalls to avoid:
1. Don't get the explosion protection class wrong — first confirm which hazardous area your site falls into
It's not simply a matter of "buying an explosion-proof unit." You need to determine whether the environment involves gas or dust, and whether it's Zone 1 or Zone 2. Chemical and petrochemical plants mostly require gas explosion protection (Exd/Exde); coal mines need MA (coal safety) certification; pharmaceutical plants may only need dust explosion protection (DIP). The LB Type covers ExdeibIICT4 + DIP A21 TA, which handles most scenarios. If you're unsure, have our technical team survey the site before making a decision.
2. The hoist must be an explosion-proof model — BCD/BMD/HB
The hoist is the heart of an explosion-proof crane. Using a standard CD1/MD1 hoist in a hazardous area is a safety hazard. The LB Type must be paired with a BCD, BMD, or HB explosion-proof electric hoist for the entire unit to be genuinely explosion-proof. When placing an order, verify the hoist model on the configuration sheet — don't let it be swapped for a standard unit.
3. Wheel material matters — stainless steel tread surfaces or nylon wheels
The crane and trolley wheel assemblies on explosion-proof cranes use stainless steel tread surfaces or nylon wheels to eliminate sparks generated by metal-to-metal friction during operation. This detail is easy to overlook — if standard steel wheels are used, friction sparks against the rail become an ignition source in a gas environment.
4. Control voltage is 36V — not 380V
The LB-type explosion-proof crane uses AC 36V safety voltage for its control system — a mandatory requirement for explosion-proof electrical equipment. The control system includes master stop and master start functions to ensure rapid power cutoff in an emergency.
FAQ
Q: What's the difference between an LB-type explosion-proof crane and a standard LD Type single girder crane?
A: The fundamental difference lies in explosion-proof capability. The LB Type is manufactured to the GB3836 standard, with flameproof electrical equipment, spark-resistant wheels, and the whole unit carrying the ExdeibIICT4 explosion-proof marking. Standard LD Type cranes have none of these protective measures and would pose an explosion risk in flammable or explosive environments. Price-wise, the LB Type costs 40%–80% more than an LD Type of the same capacity — but this is a safety investment you can't afford to skip.
Q: Can an explosion-proof crane be used in a standard workshop?
A: Technically yes, but there's no reason to. The explosion-proof components on these cranes — the flameproof enclosure, explosion-proof hoist, nylon wheels — are overkill in a standard workshop, and the price premium is substantial. If your facility has no explosive gases or dust, a standard LD Type single girder crane is sufficient.
Q: How do I determine which explosion protection level my site requires?
A: Three factors determine this: the environmental medium (gas or dust), the hazardous area classification (Zone 1 or Zone 2), and the temperature class (T1–T6). The LB Type covers ExdeibIICT4 — IIB/IIC gas groups, T4 class (≤135°C), Zones 1 and 2. If your site has Zone 0 requirements or temperatures exceeding 135°C, a custom solution is needed. Contact our technical department with your site's medium and temperature parameters and we'll confirm the right specification.
