The Wide Application and Principle Analysis of Explosion Proof Lever Hoist

1、 Core application scenarios

Explosion proof lever crane is a special equipment designed for flammable and explosive environments, and its application scenarios cover the following fields:

Petrochemical industry

Used for oil tank maintenance, pipeline installation, and other scenarios to avoid explosions caused by electric sparks in traditional electric equipment.

For example, during the maintenance of catalytic cracking units in refineries, explosion-proof cranes are required to lift catalyst containers.

Natural gas extraction and storage and transportation

Used for valve replacement, equipment maintenance, and other operations in natural gas processing plants, underground gas storage facilities, and other places.

Case: A certain offshore natural gas platform used an explosion-proof lever crane to replace underwater valves, avoiding submarine pipeline explosions caused by sparks from electric tools.

Coal and metal mines

Used for underground equipment installation, hoisting of tunnel support materials, and prevention of methane and other flammable gas explosions.

Data: China's "Coal Mine Safety Regulations" clearly stipulate that underground lifting equipment must have explosion-proof performance.

Pharmaceutical and Food Processing

Used for raw material handling and equipment maintenance in places with dust explosion risks such as alcohol fermentation workshops and flour processing plants.

Example: A beer factory's saccharification workshop uses explosion-proof cranes to lift malt and avoid dust explosion accidents.

2、 Explosion proof technology principle

Explosion proof lever cranes achieve intrinsic safety through the following technologies:

Mechanical transmission structure

Application of leverage principle:

The crane amplifies manpower through a lever system to lift heavy objects. For example, the joystick serves as a power arm, transmitting force to the load end through gear or chain transmission. The length of the power arm and the ratio of the resistance arm determine the labor-saving effect.

Balance arm design: By adjusting the length of the balance arm, the torque generated by the crane arm and the balance arm is equal, ensuring that the equipment remains stable when the load changes and avoiding danger caused by tilting.

Non spark design:

The entire process adopts mechanical transmission without electrical components such as motors or batteries, completely eliminating the risk of electric sparks.

Key components such as gears and bearings are made of explosion-proof materials (such as copper alloy) to avoid friction sparks.

Explosion proof materials and processes

Shell protection:

The whole machine shell is made of stainless steel or aluminum alloy material, and the surface is treated with anti-static to prevent static electricity accumulation and explosion.

Sealing structure: Key parts (such as gearboxes and chain covers) are protected with IP65 or higher to prevent flammable gases or dust from entering the interior.

Lubrication and maintenance:

Use explosion-proof grease to reduce friction heat and spark risk.

Regularly inspect the seals to ensure their explosion-proof performance remains effective.

Safety certification and standards

Compliant with international explosion-proof standards (such as ATEX, IECEx) and Chinese national standards (GB 3836 series), tested by explosion-proof certification agencies.

Identification requirements: The equipment casing must be labeled with explosion-proof rating (such as Ex d IIB T4), manufacturer information, and certification number.

3、 Typical Case Analysis

Case 1: Tank Maintenance Project of a Chemical Enterprise

Scenario: Maintenance tools (weighing approximately 200kg) need to be lifted from the top of the storage tank, as flammable vapors are present inside the tank.

Solution:

Select an explosion-proof lever crane with a rated load of 300kg, equipped with explosion-proof chains and hooks.

The operator manually lifts the tool using a lever to avoid the risk of electric equipment sparks.

Effect: The maintenance cycle has been shortened by 30%, and no explosion accidents have occurred.

Case 2: Valve Replacement Operation on Offshore Platforms

Scenario: Valve replacement at a distance of 5 meters from the underwater pipeline, with a risk of natural gas leakage in the surrounding area.

Solution:

Use an explosion-proof lever crane to lift the valve (weighing approximately 150kg) and adjust the balance arm to maintain equipment stability.

The operator stands in the explosion-proof compartment to remotely control the lever and avoid direct contact with the hazardous area.

Effect: Homework efficiency increased by 40%, and safety records remained zero accidents.

4、 Technical advantages and limitations

advantage

Intrinsic safety: No electrical components, completely eliminating the risk of electric sparks.

Strong adaptability: It can work in harsh environments such as -20 ℃ to+60 ℃ and humidity below 95%.

Low maintenance cost: The mechanical structure is simple, the failure rate is low, and the maintenance cycle is over 5 years.

limitation

Limited lifting height: usually not exceeding 10 meters, suitable for close range operations.

High labor intensity: requiring manual operation of levers, not suitable for long-term or high-frequency operations.

Heavy weight: Explosion proof materials and sealing structures increase the weight of the equipment, resulting in poor portability.

5、 Future Development Trends

Lightweight design: using high-strength aluminum alloy and composite materials to reduce equipment weight.

Intelligent upgrade: Integrated torque sensor and display module, real-time monitoring of load status and early warning.

Modular combination: Develop detachable explosion-proof components to meet the needs of different work scenarios.

The main equipment produced by Hebei Makita: stage electric hoist, electric chian hoist, wire rope electric hoist，Hand chain hoist, lever hoist, pneumatic hoist and other lifting equipment