Page 222 - Water Standards
P. 222
2) At the lifting point of design rated load, increase the load gradually from 75% to
110% of rated load and keep repeating the operations such as lifting up, lowering
down, pausing, then lifting and lowering again, for at least 1 hour.
3) When using the headstock gear as a crane, not only shall the lifting up, lowering
down and pause tests be done under 1 1 times rated lifting load according to the
crane operation condition and rated lifting weight, but also walking tests shall be
also done for the cart and crab.
4) Check each mechanism carefully during the dynamic load test. They shall be able
to move freely and work steadily and reliably. Each limit switch and safety protec⁃
tion interlock device shall move correctly and reliably. No joint shall be loose
4 1 15 The trial operation of screw⁃type headstock gear shall meet the following require⁃
ments:
1 Trial operation shall be done at the work site. Test recording and quality checks shall
be well done. Test running can be combined with equipment debugging
2 Electrical equipment tests shall meet the following requirements. Before the power
connection test, all the wiring shall be checked in order to meet the drawing requirements.
The circuit insulation resistance shall be larger than 0 5MΩ. During the test, temperature ri⁃
ses of each electric motor and electrical component cannot be larger than the allowable values.
The headstock gear s own electrical equipment shall be adopted in the test. Component
contact terminals which get burnt shall be replaced
3 Zero load tests shall meet the following requirements:
1) Headstock gear running tests without the sluice gate shall be done back and forth 3
times over the whole stroke.
2) When the electric motor is running, the unbalance degree in the three⁃phase cur⁃
rent shall be no larger than ±10% and the electrical equipment shall have no ab⁃
normal heating phenomenon.
3) When the headstock gear runs to the upper and lower limit position of the stroke,
the limit switch shall be able to send signals and cut off the power automatically to
stop the running of the headstock gear.
4) When all the mechanical parts are running, there shall be no impacting or other
abnormal sounds.
4 Loads tests shall meet the following requirements:
1) The headstock gear running test with the sluice gate should be done at the design
water head. The sluice gate shall be closed twice in flowing water conditions.
2) The driving mechanism shall run steadily and no abnormal sound, heating or oil
leakage occur.
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