Appraisal outline for actual operation skills of crane machinery installation and repair personnel

Crane machinery installation and repair personnel are a type of staff who install and repair cranes. They must have a certain knowledge of common problems such as cranes . Personnel engaged in this occupation need to be assessed and listed, in addition to the assessment of theoretical knowledge. In addition, the actual operation skills must be assessed. The editor compiled the assessment scope of his practical skills for everyone's reference and study.

D1. Basic operating skills

D1.1 Use of commonly used measuring instruments

Including the use of level gauges, theodolites, vernier calipers, dial indicators, internal and external micrometers, and the use of steel tape correction values.

D1.2 Identification of common main stressed structural parts and mechanical parts

D1.2.1 Identification of common main stressed structural parts

Including the identification of main beams, main and auxiliary booms, main supporting legs, standard sections, etc.

D1.2.2 Identification of common mechanical parts

Including the identification of reducer, coupling, wheel set, reel set, hook set, pulley set, etc.

D1.3 Identification of commonly used welding symbols.

D1.4 Identification of technical documents, such as structural assembly drawings, mechanical parts and assembly drawings.

D2. Professional operation skills

D2.1 The basic operation method of hoisting machinery.

D2.2 Installation, adjustment and repair of main stressed structural parts

Including the installation, adjustment and repair of main beams, main and auxiliary booms, main support legs, standard sections, cabs, walking platforms (ladders, platforms, railings), etc.

D2.3 Installation, debugging and repair of main mechanical parts

Including the installation, debugging and repair of reducer, brake, coupling, wheel set, drum set, hook set, pulley set, wire rope, etc.

D2.4 Installation, debugging and repair of common mechanical transmission system

Including the installation, debugging and repair of lifting mechanism, walking mechanism, luffing mechanism, slewing mechanism, etc.

D2.5 Installation, adjustment and repair of common hydraulic transmission systems (applicable to operators with hydraulic systems)

Including the installation, adjustment and repair of power components, control components, actuators, auxiliary components, etc.

D2.6　Installation, adjustment and repair of common safety protection devices

Including the installation, adjustment and repair of brakes, lifting weight limiters, torque limiters, height limiters, stroke limit devices, wind protection devices, etc.

D2.7 Common performance test

Including no-load test, static load test, dynamic load test, continuous operation test and other performance tests.

D2.8 Common mechanical troubleshooting

D2.8.1　Common faults of brakes

Including the following faults:

(1) The brake wheel cannot be braked;

(2) The brake is not released;

(3) The brake heats up, the friction plate emits a burnt smell and wears quickly;

(4) The brake is easy to leave the adjustment position, and the braking torque is not stable enough.

D2.8.2 Common faults of reducer

Including the following faults:

(1) When the gears are meshed, there is uneven percussive sound and the casing vibrates;

(2) The reducer vibrates on the base;

(3) Oil leakage on the split surface;

(4) The housing, especially the place where the bearing is installed, generates heat;

(5) The reducer heats up as a whole.

D2.8.3 Common faults of operating mechanism

Including the following faults:

(1) The bridge runs slantingly and gnaws the track;

(2) Skidding;

(3) "Three-legged" operation;

(4) The whole machine twists when starting.

D2.8.4 Common faults of coupling

Including the following faults:

(1) There are cracks in the coupling half;

(2) Wear of connecting bolts and pin holes;

(3) The gear teeth of the gear coupling are worn or broken.

D2.8.5 Common faults of rolling bearings

Including the following faults:

(1) The temperature is too high;

(2) Abnormal sound (intermittent dumb sound);

(3) Metal grinding sound;

(4) Filing or impact sound.

D2.8.6 Common faults of wheels

Including the following faults:

(1) There are fatigue cracks on the tread and the spoke wheel;

(2) Uneven wear of the active wheel tread;

(3) The tread or rim is severely worn.

The combination of theoretical knowledge and practical operation can train qualified personnel.

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