8.4.1 When the bearing beam of the supporting frame of hydrauliccylinder is simply supported, structural deflection shall be calculated,the loads for calculation shall be conformed to 4.9.3, and the positionand direction of action shall be the most unfavo...[繼續(xù)閱讀]

    The basic symbols and their meanings used in this standard are as thefollowings.F applied forceM momentP pressureN powerm massq discharge quantityQ flow rateE modulus of elasticityG shear modulusσ normal stressτ shear stressσs yield strengthσb tensile str...[繼續(xù)閱讀]

    4.6.1 The pipe nominal diameter and wall thickness shall bedetermined through calculation of intensity and velocity according tothe maximum working pressure and maximum flow of hydraulicpipeline.4.6.2 Special pipe trench should be set for outdoor hydrauli...[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]

    4.2.1 The classification of hydraulic hoists is as the followings.(1) According to the working principle of hydraulic cylinder: pistontype and plunger type.(2) According to the piston sealing mode and force on piston rod:single action type and double acti...[繼續(xù)閱讀]

    9.2.1 Hydraulic hoist shall be provided with correspondingelectrical control system according to various operating conditionsand control functions designed as per the principle of hydraulicsystem.9.2.2 Local electrical control system should be controlled ...[繼續(xù)閱讀]

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    7.5.1 The nominal diameter and wall-thickness of hydraulic pipeshould be determined through calculation according to the maximumworking flow, allowable velocity of oil flow and the maximumworking pressure. The nominal diameter of hydraulic piping shouldbe...[繼續(xù)閱讀]

    7.2.1 The components layout of hydraulic valve block shall becompact and easy to debug and repair; the internal channels ofintegrated block shall be short and reasonable. The meters shall bearranged in one meter board for vision.7.2.2 The selection of nom...[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]