445558713 568947806 mail@grabmag.ru ABOUT THE PLANT PRODUCTS AND SERVICES NEWS ARTICLES QUESTIONNAIRES GALLERY CONTACTS Home - Our products - Grabs - Four Rope Grabs Grapple Electromagnet Traverse Iron separator Control block Vibro unloader Throttle Weight measuring instrument Capture UPS Casting Staple Transformer Crane Four Rope Grapples Four-rope grabs are grabs in which the lifting operations are performed by two lifting (supporting) ropes, and the opening and closing of the grab is performed by two closing (closing) ropes. How the four-rope grab works The gripping elements are jaws (two or more), pivotally attached to the lower traverse and by means of rods to the upper traverse, on which the supporting rope is fixed. The working (closing) ropes are passed through the holes in the guide bushings (rollers) of the upper traverse, pass through the pulley blocks and are fixed through the wedge bushings on the upper or lower traverse, depending on the design of the grab, or go to the drums of the winch. The open grab is lowered onto the working surface (see figure) when the cables are released from the drum of the winch of the supporting S 2 and closing ropes S 1 . The grab is closed by pulling the closing ropes S 1 , and the fixed hoisting ropes S 2 . The lower traverse and the upper traverse are converging. The jaws, grasping the load, converge until the cutting edges are in full contact. The grab is lifted while simultaneously pulling out the supporting S 2 and closing ropes S 1 in the upward direction. The unloading of the grab is carried out with fixed support ropes S 2 and the release of the closing ropes S 1. The grab's jaws are opened by its own weight and the weight of the load, and the contents of the grab are released. Advantages of the four-rope grab : - reduced rope wear; - возможность создания большого усилия закрытия грейфера (в сравнении с одноканатными грейферами). Недостатки четырёхканатного грейфера: - необходимость оборудования грузоподъёмного механизма двухбарабанной лебёдкой; - потери времени при частой смене грузозахватных органов (требуется время для перепасовки грузоподъёмных канатов). Типовой ряд серийных четырёхканатных грейферов Модель грейфера Г/п крана, т Расчётный объём, м3 Насыпная плотность груза, т/м3 Диаметр каната, мм Допустимая масса зачерпываемого груза, т Масса грейфера, т ДГ2-2-С3-4к-0,35 2,0 0,35 1,6-2,0 12 0,7 0,6 ДГ2-2-С3-4к-0,5 2,0 0,5 1,6-2,0 12 1,0 0,75 ДГ2з-5-Т2-4к-0,8 5,0 0,8 2,5-3,0 18 2,4 2,1 ДГ2-5-С3-4к-1,6 5,0 1,6 1,6-1,8 15 2,9 2,1 ДГ2-5-С2-4к-Пр-1,6 5,0 1,6 1,25-1,6 15 2,4 2,2 ДГ2-5-С3-4к-Пр-1,6 5,0 1,6 1,8 14 2,88 2,1 ДГ2-5-С2-4к-2,0 5,0 2,0 1,3 18 2,6 2,4 ДГ2-10-Т2-4к-1,6 10,0 1,6 2,5-3,2 18 5,12 4,7 ДГ2-10-Т1-4к-2,0 10,0 2,0 2.0-2.4 18 5.0 4.8 DG2-10-S3-4k-Pr-V-2,3 10.0 2,3 1.6-2.0 18 4.6 4.6 DG2-10-S2-4k-Pr-2.7 10.0 2.7 1.25-1.4 18 3.8 6.2 DG2-10-S3-4k-V-3.0 10.0 3.0 1.6-1.8 twenty 5.4 4.6 DG2-10-S2-4k-Pr-V-3.2 10.0 3.2 1.25-1.6 18 5.1 4.4 DG2-10-S3-4k-Pr-3.2 10.0 3.2 1.6-1.7 twenty 5.5 4.3 DG2-10-L2-4k-Pr-5.0 10.0 5.0 0.8-1.0 twenty 5.0 5.0 DG2-16-T2-4k-3.2 16.0 3.2 2.5-3.0 24 9.6 6.4 DG2z-16-T2-4k-3.2 16.0 3.2 2.5-2.9 22 9.5 6.5 DG2-16-L2-4k-Pr-7.0 16.0 7.0 0.8-1.0 22 7.0 7.5 DG3-16-S3-4k-PCh-4.0 16.0 4.0 1.6-2.0 28 8.0 6.5 DG2-16-S3-4k-5.3 16.0 5.3 1.6-1.7 24 9.0 6.9 DG2-16-L2-4k-8.0 16.0 8.0 0.8-1.0 26 8.0 8.0 DG2z-20-S3-4k-6.3 20.0 6.3 1.6-1.8 25 11.4 8.5 DG2-20-S2-4k-7.0 20.0 7.0 1.25-1.6 26 11.2 8,7 DG2-32-L2-4k-16.0 32.0 16.0 1.0 34 16.0 16.0 DG2-16-VT1-4k-6.3 16.0 1.5 3.2-4.0 24 6.3 9.5 All rights reserved © 2008-2014 - LLC "Plant of lifting equipment" RF, 610004, Kirov, st. Semakovskaya, 41