4.7.1 Hydraulic medium shall have the properties of good lubricity,antioxidant, rust resistance and no corrosion to metal, shear stability,compatibility with sealing materials, defoaming and antifoam.4.7.2 Mineral oil type hydraulic oil shall be used as h...[繼續(xù)閱讀]

    4.8.1 The working principle, support structure, seal structure andlayout of hydraulic cylinder assembly shall be consistent with thetype of hydraulic hoist specified in 4.2.4.8.2 The slenderness ratio should not be larger than 300 forvertical cylinder and...[繼續(xù)閱讀]

    4.9.1 The load of hoist is transferred to the structure foundationthrough the supporting structure of hydraulic cylinder. The supportingstructure is generally welded by steel plates, which shall be of frametype, or partially embedded hinge seat type or ot...[繼續(xù)閱讀]

    4.10.1 Hydraulic and electric control system must be provided withover-pressure and under-pressure protection circuit according to thevarious operating conditions of hydraulic hoist.4.10.2 Reliable stroke limit switch shall be provided for thehydraulic cy...[繼續(xù)閱讀]

    4.11.1 Hydraulic hoist shall be provided with cylinder strokedetection device.4.11.2 The stroke detection device shall have excellentperformance against interference, the output signal of the sensor shallbe continuous and reliable and with good performanc...[繼續(xù)閱讀]

    5.0.1 Deadweight loadIt is the gravity of hydraulic hoist structure, hydraulic pipes andaccessories, mechanical and hydraulic equipment, electricalequipment and hydraulic oil.5.0.2 Hoisting loadIt is the opening force, closing force or holding force actin...[繼續(xù)閱讀]

    6.1.1 The carbon steel casting parts shall be of Grades ZG230-450,ZG270-500, ZG310-570, ZG340-640 in GB/T 11352.6.1.2 Alloy steel castings should be of Grades ZG20Mn,ZG20SiMn, ZG20MnMo, ZG35SiMnMo in JB/T 6402 Castings forthe Large Low Alloy Steels.6.1.3 ...[繼續(xù)閱讀]

    6.2.1 Carbon steel forgings and rolled pieces should be of Grade 20,Grade 25, Grade 35, Grade 45 in GB/T 699 or JB/T 6397Specification for the Heavy Carbon Structural Steel Forgings, andother grades of steel meeting the working conditions.6.2.2 The forgin...[繼續(xù)閱讀]

    6.3.1 The main metal members of supporting structures should bemade of the materials with the mechanical performance of not lessthan Grade Q235B in GB/T 700 and Grade Q345B in GB/T 1591,The grade of material shall be selected according to the local lowest...[繼續(xù)閱讀]

    6.4.1 Welding material(1) The manual welding electrode shall be of the grades in GB/T 5117Carbon Steel Covered Electrodes, GB/T 5118 Low Alloy SteelElectrode and GB/T 983 Stainless Steel Electrode which shall matchthe mechanical performance of base metal....[繼續(xù)閱讀]