Page 220 - Water Standards
P. 220

12  The slippage test of gate shall be done by an open gate hoisted by a hydraulic head⁃
           stock gear. The slippage test shall meet the following requirements: The amount of slippage
           of the sluice gate due to internal oil leakage in the hydraulic cylinder shall be no greater than
           100mm over 24 hours. When the slippage is greater than 100mm after 24 hours, there shall
           be alarm signals generated. When the slippage is larger than 200mm, the hydraulic system
           shall be able to be reset automatically. The system shall not reset automatically more than
           twice in 72 hours  
               13  For a single hydraulic headstock gear which has double lifting points and an auto⁃
           matic rectifying function, if the deviation from synchronous travel between its two hydraulic
           cylinders exceeds the design value in any position of the stroke, it shall be corrected by the
           automatic rectifying devices.
           4   1   14  The trial operation of mobile headstock gear shall meet the following requirements:
               1  Before trial operation, the following items shall be checked:
                 1 ) Check the installation of all mechanical parts, connecting parts, protection
                   devices and the oil filling condition of the lubricating system. The result of the
                   check shall meet relevant requirements and all the sundries on both sides of the
                   track shall be removed.
                 2) Check the two ends of the steel wire rope to ensure that they are firmly fixed and
                   make sure that the rope has been wound in the right direction on the coiling block
                   or the pulley wheel.
                 3) Check the cable  s coiling block, central electrical conducting device, slide wire,
                   transformer and each motor to see if the wiring is correct and whether or not the
                   wiring is loose. The ground connection shall be checked as well.
                 4) For a hoisting mechanism with dual motor drives, the electric motor shall be
                   checked to see if the running direction is correct and if the rotational speeds of the
                   two drives are synchronous. For a hoisting mechanism with dual hoisting points,
                   the steel wire ropes on both sides should be adjusted to be of equal length.
                 5) Check the running mechanism to see whether the running direction of the electric
                   motor is correct and whether the rotational speeds are synchronous.
                 6) Turn each mechanism brake wheel by hand to make sure that the last axle (such
                   as the wheel axle and coiling block axle) has no blockage when completing a sin⁃
                   gle turn.
               2  Trial operation shall meet the following requirements:
                 1) The hoisting mechanism and running mechanism shall be operated back and forth
                   along the whole stroke 3 times. The degree of unbalance of the electric motor  s
                   three⁃phase current shall be no larger than 10%. The electrical equipment shall
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