Page 211 - Water Standards
P. 211

The rope shall not be squeezed or overlapped, and shall not skip slots or be in a mess  
               11  For hoisting lift with a rope guider, make sure it moves in coordinated way, and
           winds back smoothly  
               12  The indicating accuracy of a height indicating device shall be no lower than 1%.
           The device shall have an adjustable set value limit, main circuit automatic breaking function
           and alarm function. The instrument display shall have correction indications and a zero setting
           function. Stroke testing components shall have damp⁃proofing and anti⁃interference functions  
               13  The system accuracy of the load control device shall be no lower than 2% and the
           sensor accuracy shall be no lower than 0   5%. When the load reaches 110% of the rated lift⁃
           ing force of the gate, the load control device shall cut off the main circuit automatically and
           send out an alarm. The instrument display shall meet the requirements of the headstock gear
           capacity. If the headstock gear has two or more hoisting points, the instrument shall be able
           to display each point  s hoisting force respectively. The sensor and its circuit shall have damp⁃
           proofing and anti⁃interference properties  
               14  Lubricant oil used in rotating parts such as reducers, open gears, bearings, and hy⁃
           draulic brakes shall be appropriately selected according to the temperature and working condi⁃
           tions.
               15  Electrical equipment installation shall meet the relevant requirements in GB 50171.
           4   1   9  Hydraulic headstock gear installation shall meet the following requirements:
               1  After arrival at the site, the equipment shall be unpacked, checked and accepted
           first. Only when the parts have passed the inspection can they be installed  
               2  The distance between the crosswise center line of the hydraulic headstock gear rack
           and the actual hoisting center line shall be no larger than ±2mm. The elevation deviation shall
           be no larger than ±5mm. For hydraulic headstock gear with double lifting points, the sup⁃
           porting surface elevation difference shall be no larger than ±0   5mm  
               3  The composite surface of the rack steel beams and thrust supports shall not have any
           throughout gaps wider than 0   05mm, and any localised gaps no larger than 0   1mm and the
           depth no larger than 1 / 3 of the composite surface width. The cumulative value of the localised
           gap depth shall be no larger than 20% of its perimeter. The horizontal deviation of the thrust
           support top surface shall be no larger than 0   2 / 1000  
               4  When hoisting the hydraulic cylinder, measures shall be taken to prevent deforma⁃
           tion. Determine the number of supporting and hoisting points according to the hydraulic
           cylinder  s diameter, length and weight. All the supporting points shall be supported by cross⁃
           ers  
               5  Pipelines installed in the field shall be entirely flushed by recycle oil, and the flush⁃
           ing speed should be large enough to generate turbulent flow. The filter screen accuracy shall
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