When using explosion-proof chain hoists, it is necessary to strictly control them from four dimensions: environmental adaptation, operating standards, maintenance, and personnel training, to ensure their safety and reliability in explosive environments. The following are specific precautions:

1、 Environmental adaptation: Ensure that explosion-proof performance matches the work scenario

Explosive environment zoning verification

Confirm the explosive gas/dust zoning of the workplace (such as Zone 0, Zone 1, Zone 2 or Zone 20, Zone 21, Zone 22), and select the corresponding explosion-proof level hoist.

Example: Explosion proof type (Ex d) is required in Zone 1 (where explosive gases may occur during normal operation), while increased safety type (Ex e) can be used in Zone 22 (where dust accumulates but only exists abnormally).

Temperature group matching

Select the temperature group of the gourd based on the highest environmental temperature (such as T4 indicating surface temperature ≤ 135 ℃) to avoid explosions caused by high temperatures.

Taboo: Using T4 group hoist in T1 group environment (maximum surface temperature 450 ℃) may result in explosion-proof failure.

Protection against corrosive environments

If the work environment contains corrosive gases (such as hydrogen sulfide) or liquids, stainless steel shells or galvanized hoists should be selected, and anti rust oil should be regularly applied.

2、 Operation standard: Eliminate risks caused by violations

Load limit

Strictly adhere to the rated load and prohibit overloading. Overloading may cause chain breakage, shell deformation, and damage to explosion-proof structures.

Data: If the rated load of the hoist is 3 tons, the actual lifting weight shall not exceed 3 tons, and the dynamic load factor (usually 1.1-1.25) shall be considered.

Control of lifting angle

Maintain vertical lifting and avoid lateral tension. When the diagonal angle exceeds 5 °, guide pulleys or adjust the position of the lifting point should be used.

Risk: Diagonal pulling may cause chain jamming, brake failure, and even rollover.

Operation taboos

Do not strike: Do not use hammers or other tools to strike the shell or chain of the hoist during homework to prevent cracking of the shell and explosion prevention failure.

Avoid emergency stop: Sudden release may cause heavy objects to shake. The bracelet should be slowly released to ensure smooth braking.

Stay away from heat sources: During the lifting process, maintain a safe distance (usually ≥ 1 meter) from high-temperature equipment (such as steam pipelines) to prevent deformation of the casing.

3、 Maintenance: Regular inspections to ensure explosion-proof performance

Daily inspection items

Shell: Check for cracks, deformation, and whether the sealing gasket has aged and fallen off.

Chain: Check whether the chain links are worn (if the wear exceeds 10% of the original diameter, they need to be replaced), whether they are broken or twisted.

Brake: Test the braking performance to ensure no slipping during lifting (braking distance should be ≤ 0.5 meters/second).

Bracelet: Check if the bracelet is stuck or broken, and if the lubrication is sufficient (explosion-proof grease should be used).

Regular professional inspection

Cycle: Conduct a comprehensive inspection at least once a year, including explosion-proof performance testing, load testing, etc.

Standard: Refer to the GB 3836 series standards (such as GB 3836.1-2021 "Explosive Atmosphere Part 1: General Requirements for Equipment").

Record: Establish inspection files, record inspection dates, results, and repair contents.

Scrap conditions

Shell: Cracks or deep scratches (depth>0.5mm) that cannot be repaired.

Chain: Wear exceeds 10% of the original diameter, or the chain link breaks.

Brake: Failed and irreparable, causing heavy objects to slip during lifting.

4、 Personnel training: Enhance safety awareness and operational skills

Explosion proof knowledge training

Operators need to understand the dangers of explosive environments, the explosion-proof principles of explosion-proof hoists, and their applicable scenarios.

Case: By simulating explosive gas leakage scenarios, train personnel on how to correctly use gourds and evacuate urgently.

Operational skills assessment

Regularly organize practical assessments to ensure that personnel master skills such as load calculation, lifting angle control, and braking testing.

Data: The pass rate of the assessment must reach 100%, and those who fail must undergo retraining.

Emergency response drill

The emergency response process for simulating gourd faults (such as chain breakage, brake failure), including emergency braking, personnel evacuation, etc.

Tools: Equipped with explosion-proof intercoms, emergency lighting and other equipment to ensure the authenticity of the drill.

5、 Additional security measures

Anti static design

Ensure reliable connection between the gourd shell and the grounding system (grounding resistance ≤ 4 Ω) to prevent static electricity accumulation.

Operator: Wear anti-static work clothes and gloves to reduce the risk of electrostatic discharge.

Warning signs

Mark the explosion-proof level (such as Ex d IIB T4 Gb), rated load, and usage environment requirements in a prominent position on the gourd shell.

Example: Annotate warning signs such as "No Overloading" and "No Striking".

storage management

When not in use, store the gourd in a dry, ventilated explosion-proof warehouse to avoid contact with corrosive substances.

Temperature: The storage environment temperature should be controlled between -20 ℃ and+40 ℃.

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