LHB Type Explosion-Proof Electric Hoist Bridge Crane

The LHB explosion-proof electric hoist bridge crane is a lifting device used in explosive atmospheres. The explosion-proof crane is used in conjunction with an explosion-proof wire rope hoist trolley, and all components comply with strict explosion-proof standards to ensure that no sparks or thermal energy ignite surrounding flammable gases, vapors, or combustible dust. When selecting such a crane, the appropriate explosion-proof class and specifications must be matched according to the hazardous area classification of the working environment (e.g., Zone 1, Zone 2, Zone 21, or Zone 22) and the type of explosive substances.
As an ATEX-certified electric hoist crane, it is an ideal choice for safe material handling in flammable and explosive locations such as oil refineries, chemical plants, paint spray booths, gas stations, and pharmaceutical workshops.

Features of LHB Explosion-Proof Electric Hoist Bridge Crane

Overall flameproof safety design
The hoisting motor, trolley motor, electric control box, limit switches, and cable connectors are all equipped with independent flameproof enclosures. The enclosures can withstand internal explosions, preventing sparks and high-temperature fragments from igniting combustible gas mixtures in the workshop.
The travelling wheels are specially treated with anti-friction spark technology, eliminating metal impact sparks when the bridge and trolley travel on the rails.
The lifting core adopts an explosion-proof wire rope electric hoist, and all hoist components have passed explosion-proof inspection and are qualified.

Stable and compact structure
The whole crane adopts a box-type structure with high rigidity and a compact design. It requires low workshop headroom, has low wheel pressure, low operating noise, and relatively light dead weight. It is suitable for projects with limited height clearance or for upgrading old workshop buildings.

Multi-layer safety protection system
The LHB explosion-proof bridge crane is equipped with upper and lower lifting limit switches, an overload limiter, bridge travel buffers, an emergency stop button, a trolley anti-drop device, and electrical protection against short circuit and overload. All safety switches have explosion-proof qualification certificates.

Easy maintenance and long service life
The modular structure design makes parts replacement and equipment inspection convenient. The whole crane has low energy consumption and a long service life.

Applications of LHB Explosion-Proof Electric Hoist Bridge Crane

It is suitable for material handling in explosive environments with light to medium tonnage and low to medium frequency requirements.

Petrochemical and refining industry: used in crude oil processing workshops, flammable and explosive oil product warehouses, pipeline maintenance workstations, and oil storage areas for equipment lifting and cargo transfer.

Explosion-proof workshops and warehouses: handling finished products, raw material drums, and packing boxes in explosion-proof warehouses or workshops.

Light industry and chemical industry: transporting medium-sized raw materials and finished products in pesticide plants, coating factories, and paint workshops.

Grain processing industry: performing equipment maintenance and repair in areas with explosive dust risks, such as flour mills and starch factories.

Other locations where flammable or explosive gases or dust are present.

	Main Girder The main girder is the core load-bearing structure of the crane's bridge, typically designed as a box-type structure to provide sufficient strength and rigidity. It spans the workshop bay and directly supports the entire load from the trolley and the lifted material.
	End Girder The end girders are located at each end of the main girders, supporting the entire crane and facilitating its travel along the runway tracks. Their driving wheel assembly and structural design ensure smooth and spark-free longitudinal movement of the entire crane (bridge travel).
	Traveling Motor These include the bridge travel motors and the trolley travel motor, which drive the entire crane (bridge) and the hoist trolley, respectively. These motors are of a flame-proof design and often feature soft-start (frequency conversion) control for smooth, shock-free operation and spark prevention.
	Explosion-proof Electric Hoist This is the core hoisting unit of the crane, integrating a flame-proof motor, brake, and gearing system. All its electrical components are enclosed within flame-proof housings to effectively prevent internal sparks from igniting the external explosive atmosphere.
	Hook The hook is the component that directly engages with the load, forged from high-tensile alloy steel and equipped with a safety latch. Its surface is smooth and crack-free, often specially treated to prevent spark generation from friction or impact, ensuring safety.

Selecting the right LHB explosion-proof electric hoist crane requires evaluating three key factors:

Hazardous Area Classification

Determine the zone (Zone 1 or Zone 2 for gas; Zone 21 or Zone 22 for dust), the gas group (IIA, IIB, IIC), and the temperature class (T1–T6). Our engineers will match the exact explosion-proof electric hoist rating to your on-site classification report.

Lifting Requirements

Define the Safe Working Load (SWL), required lifting height, and span. For applications involving frequent lifting and long travel distances, a higher duty class is recommended.

Operational Environment

Consider the ambient temperature range, humidity, and the presence of corrosive chemicals. In such cases, we provide additional anti-corrosion coatings and stainless steel trolley components. For dust explosion environments (e.g., grain, aluminum powder), the hoist is equipped with a dust explosion-proof enclosure (Ex tD).

 

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