HB Type Mining Explosion-Proof Electric Hoist

Flameproof Electrical System: All electrical components, including the motor, control box, and push-button switches, feature flameproof (Exd) designs. The enclosures can withstand internal explosion pressure without damage and will not ignite the external explosive atmosphere. The motor's Explosion Proof Marking ranges from ExdⅡBT4 to ExdⅡCT6, covering various explosive gases such as coal mine methane and chemical hydrogen/acetylene.

Dual-Voltage Power Supply: Supports automatic adaptation to both three-phase 380V and 660V power supplies, meeting the 660V standard used in underground coal mines. No external Transformer is required — the hoist connects directly to the mine's power supply system.

Complete Coal Mine Safety Certification: Holds the national Coal Mine Safety Certificate (MA Certification) and the Explosion Proof Certificate, complying with AQ standards and coal mine safety regulations. It is legally approved for use in underground mining faces and return air roadways.

Cone Rotor Self-Braking: Equipped with an explosion-proof cone rotor brake asynchronous motor that integrates power and braking functions into a single unit. This eliminates the need for an external Brake, reducing the complexity of the explosion-proof structure and minimizing potential failure points.

Corrosion Resistant Treatment: The entire housing and all fasteners undergo special Corrosion Resistant treatment, making the hoist suitable for the high-humidity, highly corrosive environments found in underground coal mines and extending the equipment's service life.

The HB Type Mining Explosion-Proof Electric Hoist is a comprehensive explosion-proof Retrofit of the standard CD1/CD Type Electric Hoist, specifically engineered for explosive atmospheres:

① Explosion-Proof Power System: Utilizes an Exd flameproof cone rotor brake asynchronous motor. The motor housing is designed as a flameproof enclosure per GB 3836.2, with all joint gaps smaller than the maximum experimental safe gap specified by the standard. When energized, the rotor moves axially against spring pressure to release the brake and drive the Gearbox.

② Three-Stage Explosion-Proof Deceleration: Motor power is transmitted through a three-stage fixed-shaft helical Gear reduction mechanism to the Drum. The gearbox housing is made of explosion-proof materials, with sealing surface widths and gaps meeting flameproof requirements to prevent internal sparks from propagating to the external environment.

③ Flameproof Control: The control box is Exd flameproof, fully isolating arcs generated by internal components such as Circuit Breakers and Contactors within the flameproof chamber. Both upper and lower Travel Limit Switches use explosion-proof power-off limit switches.

④ Wire Rope Hoisting: Drum rotation winds the Wire Rope to raise and lower the Hook. The Wire Rope features an explosion-proof design with a copper wire core or stainless steel construction to prevent friction-induced sparks. The Hook block is made of copper alloy or stainless steel to eliminate impact sparks.

The HB Type Mining Explosion-Proof Electric Hoist consists of the following explosion-proof core components:

Flameproof Cone Rotor Motor: Exd flameproof enclosure with Explosion Proof Marking ExdⅡBT4 to ExdⅡCT6, dual-voltage 380/660V. The stator features Class F insulated windings and IP55 Protection.

Flameproof Gearbox: Three-stage fixed-shaft helical Gear drive. The housing is made of explosion-proof cast iron with flameproof joint widths ≥12.5mm and gaps ≤0.2mm, complying with GB 3836.2 flameproof requirements.

Explosion-Proof Drum Device: The Drum and wire rope guide are made of Corrosion Resistant materials. The Wire Rope is available with a copper core or stainless steel construction for explosion-proof applications.

Explosion-Proof Hook Block: The Hook is made of copper alloy or stainless steel. Both the hook block sheave and the anti-drop device are constructed from non-sparking materials, eliminating collision sparks.

Flameproof Control Box: Exd flameproof enclosure housing Circuit Breakers, Contactors, Thermal Overload Relays, and a flameproof power-off limit switch. Cables are routed through flameproof cable entry devices.

Explosion-Proof Push-Button Switch: Exd flameproof Push-Button Pendant, available with either pendant cable control or Intrinsic Safety Wireless remote control.

Explosion-Proof Electric Trolley (Optional): Features an explosion-proof Travel Motor and travel wheels, complete with an explosion-proof Current Collector or cable reel system.

Underground Coal Mines: Used for equipment installation, material hoisting, and handling in methane-explosive environments such as coal mining faces, haulage roadways, and return air roadways. A Coal Mine Safety (MA) Certificate is mandatory for underground use.

Chemical Plants: Suitable for production workshops and tank farms in oil refineries, fertilizer plants, chlor-alkali plants, and other facilities where flammable gases (hydrogen, acetylene, ethylene, acetone, etc.) are present.

Oil & Gas Stations: For equipment maintenance and material handling at gas transmission stations, oil storage depots, LNG receiving terminals, and similar sites.

Pharmaceutical Workshops: For material hoisting and handling in areas where solvent vapors such as alcohol and acetone are released during pharmaceutical production.

Paint & Coating Workshops: For spray painting shops, paint warehouses, and other areas containing flammable solvents.

Operating Conditions: Ambient Temperature -20℃ to +40℃, Relative Humidity ≤85%, altitude ≤1000m. Power Supply: three-phase 380V/660V dual-voltage with automatic adaptation. Strictly prohibited to use in hazardous areas beyond the scope specified by the Explosion Proof Marking.

Pre-Operation Checks: Verify that the explosion-proof cable entry device is properly sealed; inspect the flameproof joints for any damage; check the Wire Rope for broken wires and wear; confirm the hook safety latch is functional; ensure the flameproof surfaces of the Push-Button Pendant are clean.

Operating Procedures: Strictly follow safety regulations for hazardous areas. Never open the flameproof control box or motor wiring junction box within the hazardous area. Confirm no flammable gas exceeds safe levels in the hazardous zone before hoisting operations. Overloading and angled/side pulling are strictly prohibited.

Maintenance: Check flameproof joint gaps (≤0.2mm) and corrosion monthly; inspect the Seal ring aging of the explosion-proof cable entry device quarterly; submit the Explosion Proof Certificate for validity verification annually. Do not apply ordinary paint to flameproof surfaces during maintenance — use anti-rust oil only. Restore full flameproof structural integrity after any maintenance work.

Complete Explosion-Proof Certification: The HB series mining explosion-proof electric hoist holds the National Coal Mine Safety Certificate (MA Certification) and the Explosion Proof Certificate for explosion-proof electrical equipment, covering Explosion Protection Classes from ExdⅡBT4 to ExdⅡCT6. Full certification documentation is available for safety and coal mine regulatory review.

Seamless Dual-Voltage Adaptation: Standard 380V/660V dual-voltage power supply system — 660V in underground coal mines connects directly without an external Transformer. Both the explosion-proof motor and control system feature dual-voltage design, with coil turns and Insulation Class rated to 660V standards and automatic derating adaptation at 380V.

Full-Process Quality Control: Every explosion-proof motor undergoes individual flameproof performance testing (hydrostatic test at 1.5× rated pressure) before shipment, and each control box is individually spark-tested and seal-tested. Every hoist comes with a traceable Explosion Proof Certificate number and MA certificate number, traceable back to raw material batches.

Q: What are the fundamental structural and application differences between the HB series explosion-proof electric hoist (manufactured to JB/T 10222-2011) and a standard CD1 type electric hoist?

A: The HB series is an explosion-proof electric hoist — all electrical components (motor, control box, pb push button) feature Flameproof Exd design, where the enclosure can withstand an internal explosion without igniting the surrounding atmosphere, and it holds both the MA certificate and Explosion Proof Certificate. The standard CD1 type has no explosion-proof capability whatsoever and is strictly prohibited for use in explosive atmospheres. The HB series supports 380/660V dual voltage and is suitable for hazardous locations such as underground coal mines and chemical plants, at approximately 2~3 times the price of a same-capacity CD1 unit. Kelude Heavy Industry's HB series is manufactured in strict compliance with JB/T 10222-2011 and the GB 3836 series of standards.

Q: How do I choose between ExdⅡBT4 and ExdⅡCT4 for the HB series explosion-proof electric hoist? What explosive gas atmospheres do they correspond to?

A: ExdⅡBT4 is suitable for explosive gas atmospheres containing gasoline, acetone, ethanol, methane, and other Group ⅡB gases, commonly found in chemical plants and paint shops. ExdⅡCT4 is designed for higher-risk Group ⅡC gas atmospheres such as hydrogen, acetylene, and water gas, offering a higher protection class and is also the standard grade used in underground coal mines. The HB series covers lifting capacities from 0.5t to 25t. Models from 0.5t to 2t typically use ExdⅡBT4, while units of 3t and above come standard with ExdⅡBT4 with ExdⅡCT4 available as an option. For capacities of 10t and above, ExdⅡCT4 is recommended. For underground coal mining applications, ExdⅡCT4 and above is advised. Kelude Heavy Industry can provide customized solutions matched to the specific gas group at your site.

Q: What routine maintenance is required for the flameproof motor and explosion-proof hook on the HB explosion-proof electric hoist? How often should inspections be carried out?

A: The flameproof joint surfaces on the motor housing are critical — every inspection must check for corrosion, impact damage, or excessive gap clearance (per GB 3836.2, the flameproof joint width must be ≥12.5mm and the gap ≤0.2mm). Never grind or machine the flameproof surfaces. The explosion-proof hook should be inspected monthly for cracks, wear, or deformation at the hook mouth. Copper alloy or stainless steel hooks must not come into contact with carbon steel tools to avoid spark generation. The wire rope requires regular application of explosion-proof grease. A comprehensive inspection is recommended quarterly, with an annual full inspection performed by certified personnel. Kelude Heavy Industry supplies a dedicated explosion-proof maintenance manual with every unit.

Q: What parameters do I need to provide when purchasing an HB series mining-grade explosion-proof electric hoist? What are the quotation and delivery lead times?

A: Five sets of parameters are required: ① Lifting capacity (tons); ② Lifting height (meters); ③ Explosion protection class (ExdⅡBT4/CT4/CT6); ④ Operating environment (underground coal mine / chemical plant / other); ⑤ Power supply voltage (380V/660V or other special voltages). A proposal and quotation can be issued once these parameters are provided. Reference pricing: HB 0.5–2t approximately ¥10,000–30,000; HB 3–5t approximately ¥30,000–60,000; HB 10–25t approximately ¥60,000–200,000. Production is scheduled upon parameter confirmation, with delivery typically in 15–25 days (including the coal mine safety certificate and explosion-proof certificate shipped with the unit). Contact Kelude Heavy Industry (Tel: 13903802779, Email: 3915269@qq.com) and a proposal with quotation will be issued within two working days.