lift hoist machinery safety inspection in two ways, one is the sensory examination; Another is the use of test equipment, instrumentation opponents pull hoist equipment monitoring and control.
1 sensory examination
Lifting hoist machinery safety technical inspection with inspection personnel through very much to see, hear, smell, and asked, touch to proceed. "Lifting hoist mechanical testing procedures" (2002) No. 296 provided for lifting hoist mechanical testing project is more than 70% of the total project sensory testing. Through the senses of seeing, hearing, smell, and asked, touching on the lifting hoist machinery to conduct a comprehensive and intuitive diagnostics, to obtain the necessary information and data.
See: According lifting hoist through the visual characteristics of the mechanical structure and observe the important transmission parts, load-bearing structural elements, fault source megabytes.
Listen: through the auditory analysis of the lifting hoist chain hoist equipment machinery parts running sound is normal, abnormal sound from parts of the judgment, to understand the cause, find out the source of the disease.
Olfactory: smell resolved through lifting hoist mechanical moving parts on-site odors, to identify components overheating, wear, over-burning position.
Q: Ask the driver and associated personnel lifting hoist operation, failure-prone points, after failure, category. Determination lifting hoist safety and technical conditions.
Touch: By touching lifting hoist moving parts, according to the temperature changes, vibration, determine the fault location and nature of the fault.
2 test equipment inspection
According to domestic and international trends lifting hoist machinery, application of modern condition monitoring and fault diagnosis technology has been in lifting hoist machinery design and use widely. In lifting hoist mechanical operation state, the use of monitoring diagnostic instruments and expert monitoring system for lifting hoist machinery for inspection (monitoring) test, to keep the technical condition of lifting hoist, predictable machine or system failure signs and reasons, to eliminate accidents in the bud.
3 lifting hoist components of general safety check
Check the hook marks and anti-off device meets the requirements, hook cracks, delamination and other defects; hook wear section, the opening degree of the increase in the amount of torsional deformation is exceeded; hook neck and face without fatigue deformation, cracks and associated pin, sleeve wear.
Wire rope specifications, models and matching reel pulley meets the design requirements. Rope fixed end plate, Shengka, wedge blocks, etc. rope fixtures meet the requirements. Rope wear, broken wires, kinking, flattening, bending, off shares, corrosion, etc. are exceeded.
Set the brake, the brake of the type meets the design requirements, the brake lever, the spring without fatigue deformation, cracks and other defects; pins, spindles, brake wheel, brake linings for wear exceeded, hydraulic brake oil leaks ; brake gap adjustment, braking capacity can meet the requirements.
Roll body, tube edge without fatigue cracks, damage, etc.; rope groove and the cylinder wall wear is excessive; reel flange height and rope winding layers can match; guide rope, rope work schedule meets requirements;
(5) the pulley.
Is there a retaining rope pulley groove means; pulley rope groove, rim cracks, broken edges, excessive wear and other conditions, pulley rotation is flexible.
Electric hoist reducer running without intense metal friction sound, vibration, radiation and other unusual sound shell; shaft is sealed intact, loose bolts and other conditions have defects; gear lubricant selection, the oil surface height, vertical deceleration Machine oil pump running, open gear lubrication compliance.
hoist and trolley tread, axle whether fatigue crack phenomenon axle wheel tread wear is excessive. Are there eating track running phenomenon. Caused by gnawing track what is the reason.
Coupling parts without defects, loose connections, run the impact of the phenomenon. Couplings, pin, shaft pin hole, the buffer rubber ring wear is excessive. Coupling and the connection of the two parts are concentric.
4 lifting hoist safety device checks
(1) overload protection device.
Overload protection devices are sensitive and reliable, meet the design requirements, hydraulic overload protection device opening pressure; machinery, electronics and integrated overload protection alarm, cut off the power source set-point integrated error compliance.
(2) torque limiter.
Boom type torque limiter is anti-overload occurs lifting hoist tipping safety device. Weight gain through increased law or sensitive and reliable method for detecting torque limiter and check torque limiter alarm, cut off the power source set-point integrated error is within the specified range.
(3) limit position limiter.
Check the electric hoist equipment luffing mechanism, lifting mechanism, operation mechanism reaches the set position can occur when the distance alarm signal automatically cut off the power source running dangerous direction.
(4) wind devices.
Boom hinge point for the roots of a height greater than 50 m lifting hoist should check the anemometer, wind speed setpoint is reached or when the ability to accurately operating limit speed alarm. Outdoor work in orbit lifting hoist should check rail clamp, iron shoes, anchoring device of the parts are deformed, defects, and the reliability of its work independently. For automatic rail clamp, you should check for sudden wind gusts devices and carts running with the realization of non-anchor brake state windproof function and reliability of the electrical interlock switch function.
(5) after anti-tipping devices.
The boom and luffing jib type crane hoist should check the Anti-tilting device reliability, electrical interlock sensitivity, check the location and magnitude of amplitude indicator indication accuracy.
From the weight of different types, running at different speeds lifting hoist, you should check whether the configured buffer matches and check the integrity of the buffer, run to the ends can simultaneously touch the stopper.
Check the lifting hoist and the various shields, barriers, guards, ladders, etc. are complete, reliable, lifting hoist on the exposed wound may cause wounding, open drive; couplings, sprockets, chains , belts and other rotating parts without protective cover, lifting hoist Exalted walkways, ladders, and may result in the exposed parts without barriers, whether it meets the requirements. Open for lifting hoist electric chain hoist equipment should be located rain cover.