To ensure the quality of explosion-proof electric hoists, systematic control is required from six aspects: design, material selection, production, inspection, certification, and maintenance. Specific measures are as follows:

1、 Strictly follow explosion-proof design standards

Explosion proof type selection

Choose the appropriate explosion-proof type based on the usage environment (gas or dust explosion hazardous areas):

Gas environment: Priority should be given to explosion-proof (d), increased safety (e) or intrinsic safety (i), in accordance with the GB 3836 series standards.

Dust environment: Adopting a "dust tight" or "dust-proof" casing to limit the maximum surface temperature of the casing, in compliance with the GB 12476 series standards.

Protection level: The shell protection level is usually IP65 or IP66 to prevent dust and moisture from entering.

structural optimization

Mechanical components such as drums and wire ropes need to be lubricated or coated with bronze/stainless steel materials to avoid friction sparks.

The electrical components (motors, control boxes) adopt independent explosion-proof structures to ensure that internal explosions do not ignite the external environment.

Components such as limiters and buttons must meet explosion-proof requirements, such as using bronze plated or stainless steel materials.

2、 Strictly select raw materials and components

Key component materials

Explosion proof motor: Select motors that meet explosion-proof standards, with a surface temperature not exceeding 110 ℃ (T4 group).

Steel wire rope/loop chain: Made of high-strength, corrosion-resistant materials such as stainless steel or galvanized steel wire rope.

Electrical components such as buttons and limit switches must have explosion-proof certificates, and their installation correctness needs to be verified.

Supplier Management

Priority should be given to suppliers who have obtained ISO 9001 quality management system certification to ensure stable raw material quality.

Conduct incoming inspections on key components such as explosion-proof motors and control boxes, verify explosion-proof certificates and performance parameters.

3、 Refined production and process control

modular design

Adopting a modular structure, it is easy to disassemble, maintain, and repair, shortening the maintenance cycle.

Strong universality and high interchangeability of components, reducing production complexity.

Key process control

Lubrication of reducer: Inject an appropriate amount of mechanical oil (such as 50 # mechanical oil) and replace it every six months.

Wire rope grease coating: Apply wire rope grease every week to prevent corrosion and wear.

Electrical wiring: Soft cable type power inlet is used to ensure reliable electrical connection and avoid the risk of short circuit.

Production environment management

Keep the production workshop clean and prevent dust and impurities from entering the equipment interior.

Store explosion-proof components separately to prevent cross contamination.

4、 Multi dimensional factory inspection and testing

Routine test (factory test)

Insulation resistance test: Use an insulation resistance meter to ensure compliance with standards (such as ≥ 1.5M Ω).

No load test: Run 2 cycles to check the smoothness of lifting, lowering, and horizontal movements.

Rated load test: Test the lifting speed, braking slip, and noise level under rated load.

type test

Static load test: Load 1.25 times the rated load, suspend for 10 minutes, and check for component deformation and loose connections.

Dynamic load test: Conduct five reciprocating lifting tests at 1.1 times the rated load to verify the structural strength and reliability.

Operating speed test: Measure the speed of the operating mechanism to ensure compliance with design parameters.

Special experiment

Explosion proof performance test: Tested by the Quality Supervision and Inspection Center for Explosion proof Electrical Products of the Ministry of Machinery Industry, and issued an explosion-proof certificate.

Surface temperature test: Ensure that the surface temperature of the equipment does not exceed 110 ℃ (T4 group) under normal working conditions.

5、 International Certification and Compliance

EU CE Certification

Compliant with the Machinery Directive (MD 2006/42/EC or MR EU/2023/1230), Low Voltage Directive (LVD 2014/35/EU), and Electromagnetic Compatibility Directive (EMC 2014/30/EU).

Core testing standard: EN 14492-2, which specifies requirements for mechanical structure, braking system, overload protection, etc.

ATEX and IECEx certification

Suitable for explosive gas environments (Zone 1, Zone 2) and dust environments (Zone 21, Zone 22).

Complies with the EN 60079 series standards to ensure safe use of equipment in hazardous areas.

6、 Full lifecycle maintenance and training

regular maintenance

Lubrication and maintenance: lubricate components such as reducers and wire ropes on a regular basis.

Electrical inspection: Regularly inspect cables, switches, and grounding devices to ensure the safety of the electrical system.

Replacement of vulnerable parts: Timely replace worn steel wire ropes, brake pads, and explosion-proof components.

Operator training

Familiar with equipment performance, structure, and operation methods, and master safety regulations.

Regularly conduct emergency drills to improve accident handling capabilities.

Spare parts and after-sales service

Choose manufacturers (such as Demag) that provide convenient spare parts supply and 24/7 user service to reduce downtime costs.

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