Guidelines for phased preventive measures throughout the lifecycle of explosion-proof manual carts

Procurement stage: source control, compliance first

Three principles for equipment selection

Explosion proof level matching: Select equipment that meets the GB/T 3836 standard according to the usage environment (such as Ex d IIB T3 explosion-proof type), with a focus on the explosion-proof surface structure (explosion-proof/increased safety type) and spark control design.

Supplier qualification audit: Verify whether the supplier has ISO 9001 quality management system certification, and require the provision of official documents such as explosion-proof certificates and production licenses.

Customized agreement: The contract clearly stipulates that the equipment explosion-proof performance warranty period is ≥ 5 years, and requires the supplier to provide a full lifecycle technical support commitment.

Risk avoidance strategy

Adopting a "dual source procurement" mechanism to ensure backup suppliers for key components such as explosion-proof motors and plug-in mechanisms.

Establish an equipment arrival inspection process and use explosion-proof detectors to verify key parameters such as shell clearance and thread accuracy.

Driving behavior red line

Speed control: Indoor/outdoor operations are limited to 5km/h and 10km/h respectively, with a turning radius of ≥ 2m.

Prohibited behavior: No personnel are allowed to stand when empty; Long term parking on slopes with a gradient greater than 5% is prohibited.

Maintenance phase: precise maintenance to prevent malfunctions

Level 3 Maintenance Plan

Daily maintenance (per shift): Clean the explosion-proof surface and check the torque of fasteners (key parts ≥ 80N · m).

First level maintenance (monthly): Replace the filter element of the hydraulic oil tank breathing valve and test the emergency lighting duration of the explosion-proof lamp for ≥ 30 minutes.

Secondary maintenance (quarterly): Disassemble and inspect the wear of the plug-in mechanism (allowable value ≤ 0.5mm), calibrate the hydraulic pressure gauge with an error of ＜ ± 0.2bar.

Technical upgrade suggestions

Install oil monitoring sensors to detect hydraulic oil contamination in real-time (NAS 1638 standard ≤ level 8).

Introduce ultrasonic flaw detector to regularly scan micro cracks on the explosion-proof surface, with a detection accuracy of 0.1mm.

Scrap stage: compliant disposal, elimination of hidden dangers

Scrap judgment criteria

Compulsory scrapping: Use for 8 years or accumulate 10000 hours of operation (whichever comes first).

Performance scrap: Explosion proof surface clearance exceeds the standard (>0.5mm), and the deformation of the plug-in mechanism exceeds 3mm.

Disposal process

Information cancellation: Register and file with the emergency management department, and remove the explosion-proof signs.

Physical damage: Cut the explosion-proof motor rotor and plug-in bracket to prevent illegal entry into the market.

Recycling requirements: Entrust a unit with hazardous waste treatment qualifications to dismantle and issue an Environmental Destruction Certificate.

Emergency response mechanism

Emergency response: Equipped with portable explosion-proof detectors, immediately activate emergency plans in case of leakage, and evacuate personnel within a radius of ≥ 50m.

Annual drill: Conduct an explosion-proof surface leakage sealing drill once a quarter to ensure emergency isolation is completed within 3 minutes.

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