BMD Type Explosion-Proof Electric Hoist
Product Introduction
The BMD Type Explosion-Proof Electric Hoist (also known as BMD Type Two-Speed Explosion-Proof Electric Hoist, or BMD1 Type Explosion-Proof Electric Hoist) manufactured by Kelude Heavy Industry is a wire-rope flameproof lifting device specifically designed for explosive hazardous atmospheres. It is suitable for locations where prescribed flammable gases or vapors mixed with air form explosive mixtures, with explosion protection class ExdⅡBT4 and temperature class T1~T4. The core difference from a standard electric hoist lies in its externally exposed explosion-proof components, which are made of special non-sparking materials, and its electrical parts, which adopt a flameproof design to fundamentally eliminate ignition sources.
The BMD Type Explosion-Proof Electric Hoist is designed and manufactured in strict accordance with GB 3836.1-2000 "Electrical Apparatus for Explosive Gas Atmospheres – Part 1: General Requirements" and GB 3836.2-2000 "Electrical Apparatus for Explosive Gas Atmospheres – Part 2: Flameproof Enclosures 'd'", and has passed the inspection of the Quality Supervision and Inspection Center for Explosion-Proof Electrical Products of the Ministry of Machinery Industry, holding an Explosion Proof Certificate. Kelude Heavy Industry possesses mature production processes and complete factory inspection procedures in the field of explosion-proof hoists, ensuring the safety and reliability of every unit.
Product Features
Flameproof Design: All electrical components are housed in Exd flameproof enclosures, with flameproof joint gaps ≤0.2mm (per GB 3836.2), fundamentally preventing internal arcs from igniting external flammable gases. The explosion-proof marking is ExdⅡBT4, suitable for Group ⅡA and ⅡB, Temperature Class T1~T4 explosive gas atmospheres.
Two-Speed Operation: The Hoisting mechanism supports two-speed control (fast speed 8m/min, slow speed 0.8m/min). The slow speed setting is used for precise positioning and fine adjustment of the load, significantly enhancing operational safety and precision. The travel mechanism can also be optionally equipped with two-speed or Variable Frequency Speed Control.
Non-Sparking Materials: Externally exposed components such as the hook, drum, and Wire Rope are manufactured from non-sparking materials like copper alloy or Stainless Steel, preventing sparks upon contact with steel loads and physically eliminating potential ignition sources.
Multiple Safety Protections: Equipped with safety devices including an upper Limit Switch, lower Limit Switch, Overload Limiter, phase failure protection (Phase failure protection device), and Undervoltage Protection. The Conical-Rotor Brake Motor features inherent mechanical braking, automatically applying the Brake application upon power failure to ensure the load remains safely suspended during sudden power outages.
Compact Structure: Utilizes a modular design where the Hoisting mechanism, travel mechanism, and electrical control cabinet are independently detachable for easy maintenance and replacement. During production, Kelude Heavy Industry conducts individual explosion-proof performance tests on each hoist, including flameproof joint gap measurement and dielectric test (dielectric test).
Product Images
Working Principle
The BMD Type Explosion-Proof Electric Hoist is driven by a cone rotor motor, transmitting power through a three-stage helical gear Reducer / Gearbox to the drum. The drum rotates to wind the Wire Rope, enabling the hook to Hoisting / Lifting or Lowering. The flameproof motor's rotor incorporates a conical brake ring. When energized, magnetic force overcomes the Spring force, causing axial movement of the rotor and disengaging the brake ring; when de-energized, the Spring pushes the rotor back, pressing the brake ring against the stator's internal cone to achieve rapid Braking. This principle provides the explosion-proof hoist with an additional layer of safety compared to standard hoists.
Product Structure
The BMD Type Explosion-Proof Hoist consists of the following core components:
Hoisting Reducer / Gearbox: Three-stage helical gear transmission, gears made of 20CrMnTi with Carburizing and Quenching, Tooth surface hardness HRC58-62, transmission efficiency ≥92%. The housing is a flameproof structure with flameproof joint width ≥12mm.
Flameproof Motor: BMD-specific Conical-Rotor three-phase asynchronous motor, Protection Rating (IP) IP54, Insulation Class F. Both the stator winding and Junction box feature flameproof construction, and the cable entry uses a double explosion-proof design with a sealing rubber ring and metal compression nut.
Drum Device: Cast or welded drum, configured with 6×37+IWR Wire Rope, Safety factor ≥6. The drum is equipped with a wire rope pressure plate and rope groove guard (Anti-derailment device for rope groove).
Hook Device: The explosion-proof hook is manufactured from copper alloy or Stainless Steel, preventing sparks upon contact with steel loads, and features a safety latch to prevent rope dislodgement (Load detachment safety latch)t.
Flameproof Electrical Control Cabinet: Exd flameproof enclosure housing Contactors, Thermal Overload Relay, and Transformer (380V/36V safety control voltage). The connecting cable between the cabinet and the hoist body is protected by an explosion-proof flexible conduit.
Travel Mechanism: Electric trolley type (D Type) that travels along an I-Beam Rail, with a manual trolley also available as an option. The Travel Motor is flameproof, and the tread surface of the travel wheel is hardened through Quenching.
Technical Parameters
| Model | Lifting Capacity(t) | Lifting Height(m) | Lifting Speed(m/min) | Travel Speed(m/min) | motor power(k W) | I-Beam Specification | Explosion Protection Class |
| BMD1-1 | 1 | 6~30 | 8/0.8 | 20 | 1.5 | 200~300mm | ExdⅡBT4 |
| BMD1-2 | 2 | 6~30 | 8/0.8 | 20 | 3.0 | 200~300mm | ExdⅡBT4 |
| BMD1-3 | 3.2 | 6~30 | 8/0.8 | 20 | 4.5 | 250~320mm | ExdⅡBT4 |
| BMD1-5 | 5 | 6~30 | 8/0.8 | 20 | 7.5 | 250~360mm | ExdⅡBT4 |
| BMD1-10 | 10 | 6~18 | 7/0.7 | 20 | 13 | 320~450mm | ExdⅡBT4 |
| BMD1-16 | 16 | 6~18 | 3.5/0.35 | 20 | 18.5 | 400~560mm | ExdⅡBT4 |
Note: Lifting speeds before and after the slash indicate fast/slow speeds; rail gauge (Track Gauge / Rail Gauge) and lifting height can be customized as required.
Applications
The BMD Type explosion-proof electric hoist is suitable for the following explosive hazardous atmospheres:
- Petrochemical: Material handling in refineries, chemical plants, and tank farm areas where explosive mixtures of flammable gases or vapors with air may be present.
- Coal Mining (Surface): Class II explosive gas atmospheres found in surface screening plants, coal washing plants, and coal storage bunkers.
- Fine Chemical / Pharmaceutical: Plant workshops involving Class A / Class B flammable and explosive solvents.
- Paint / Coating Production: Equipment maintenance and raw material handling in workshops producing solvent-based coatings, paints, and resins.
- Gas / Natural Gas: Equipment maintenance and lifting operations at gas-fired power plants, LNG stations, and filling stations.
Operating environment conditions: Temperature -20°C to +40°C, altitude ≤1000m, relative humidity ≤85% (at 20±5°C). For indoor use; corrosive environments and outdoor locations require special ordering.
Selection Guide
The following factors should be carefully considered when selecting a BMD Type explosion-proof electric hoist:
Explosion Protection Class Matching: Select the corresponding explosion-proof marking based on the classification of the explosive gas mixture (IIA/IIB/IIC) and temperature class (T1 to T4) at the site. The standard BMD Type is ExdIIBT4, suitable for the vast majority of chemical and petrochemical applications. For higher ratings such as ExdIICT4, the BMD1 series can be selected.
Configuration Selection: The D Type (electric trolley type) can be suspended on an I-beam rail for straight or curved travel, making it suitable for use with explosion-proof bridge cranes or explosion-proof single-girder cranes. The A Type (fixed type) has no travel mechanism and is mounted via base feet for stationary lifting applications. The AB Type (base-mounted (Platform mounting)) is fixed to a support structure through mounting plate holes.
Kelude Heavy Industry Advantage: Kelude Heavy Industry offers customization services for BMD Type explosion-proof electric hoists, including non-standard lifting heights, non-standard rail lengths, special explosion protection classes (ExdIICT4), and outdoor anti-corrosion versions. From solution design, manufacturing, and installation & commissioning to training and acceptance, we provide a complete turnkey service to solve your lifting challenges in explosive hazardous environments.
FAQ
Q: What is the difference between the BMD Type explosion-proof electric hoist and a standard CD1 Type electric hoist?
A: The core difference lies in the explosion-proof performance. All electrical components of the BMD Type feature Exd flameproof enclosures manufactured to GB 3836.2-2000, with flameproof joint gaps ≤0.2mm; exposed explosion-proof components are made of non-sparking copper alloy or stainless steel. In contrast, standard CD1 Type electric hoists (such as the Kelude Heavy Industry CD1/MD1 Type wire rope hoist) have no explosion-proof measures and are strictly prohibited for use in explosive hazardous atmospheres. In terms of price, the BMD Type is approximately 2 to 3 times that of the CD1 Type.
Q: Which national standards does the BMD Type explosion-proof electric hoist comply with?
A: The design, manufacturing, and acceptance of the BMD Type explosion-proof electric hoist strictly comply with the following standards: GB 3836.1-2000 "Electrical apparatus for explosive gas atmospheres – Part 1: General requirements", GB 3836.2-2000 "Electrical apparatus for explosive gas atmospheres – Part 2: Flameproof enclosure "d"", GB 3836.3-2000 "Electrical apparatus for explosive gas atmospheres – Part 3: Increased safety "e"", JB/T 10222-2011 "Explosion-proof electric hoists", and GB/T 3811-2008 "Crane design standard". The product must pass the explosion-proof performance inspection conducted by the Quality Supervision and Inspection Center for Explosion-Proof Electrical Products of the Ministry of Machinery Industry and obtain the explosion-proof certificate.f performance inspection conducted by the Explosion-Proof Electrical Product Quality Supervision and Inspection Center of the Ministry of Machinery Industry and obtain the Explosion Proof Certificate.
Q: Can the BMD Type explosion-proof hoist be used in underground coal mines?
A: The standard BMD Type (ExdIIBT4) is designed for Class II explosive gas atmospheres in surface facilities and is not suitable for underground coal mining (Class I atmospheres). For underground mining applications, a mining-specific explosion-proof electric hoist (HB Type) must be used, which holds both the Coal Mine Safety (MA) marking and the Explosion Proof Certificate. The mining explosion protection class is ExdI, suitable for Class I atmospheres where methane and coal dust coexist. Please confirm the classification of the installation site and the required explosion protection class when making your selection.
Q: What is the delivery lead time and installation requirement for the BMD Type explosion-proof electric hoist?
A: The delivery lead time for standard models of the Kelude Heavy Industry BMD Type explosion-proof electric hoist is 15 to 25 working days (depending on capacity and configuration). Installation & commissioning typically takes 1 to 3 working days. Installation requirements: The I-beam rail must be completed according to the design drawings, with rail joint flatness ≤1mm; the on-site power supply must be three-phase 380V/50Hz with a control voltage of 36V; the hazardous area classification and explosion protection class must be confirmed prior to installation. Kelude Heavy Industry provides full-service support from solution design through installation acceptance. For non-standard customizations, please contact our sales and technical team in advance.
