The tension hollow jack is a special jack used for tensioning steel strands and other prestressed tendons. The tensioning hollow jack needs to be used in conjunction with the tensioning oil pump, and the power for tensioning and topping is provided by the high pressure oil of the tensioning oil pump. The tension hollow jack has a compact structure, stable work during tension, high oil pressure, and large tension. It is widely used in prestressed construction projects such as highway bridges, railway bridges, hydroelectric dams, and high-rise buildings. The accuracy of the tension force value of the prestressing hydraulic jack device will directly affect the project quality and safety production. The stressing 650 tons hollow jack uses a special tensioning machine. When making prestressed concrete components, tension can be applied to the prestress. The special hydraulic jacks are mostly double acting hollow jacks. Hollow jacks for sale are suitable for tensioning steel or steel wire bundles, and are mainly composed of tensioning cylinder, pressing cylinder, pressing piston and spring. The feature is that there is a core hole along the axis of the stretching machine. After the steel bar or steel wire is penetrated, it is anchored by the tool at the tail. When stretching, the front and rear oil nozzles are opened, and the rear oil nozzle supplies oil to the tensioning working oil chamber. The body moves backward. Because the steel cable is anchored to the tool anchor on the top layer of the jack, the 300 tons prestressing hydraulic jack stretches the steel cable through the tool. The hollow jack for sale adopts a new type of sealing element, which enables the cylinder body to withstand high pressure while simultaneously enhancing the sealing strength; The stressing 650 tons hollow jack adopts special alloy steel cylinder body material with heat treatment processing technology to reduce the expansion ratio of the cylinder body during the tensioning process and increase the life and sealing performance of the seal by about 20%; In view of the problem that the hollow jack is easily damaged due to the overpressure on the return stroke of the hollow jack during the tensioning operation, an overpressure protection valve is added to the hollow jack for pressure relief protection; at the same time, several commonly used models are improved by using the wire reel type and the flange type structure. , So that the hollow jack can withstand the return hydraulic pressure is strengthened, greatly reducing the possibility of hollow jack damage due to improper operation.
In summary, the YDC series hollow jacks for sale with new structures and new technologies have improved performance compared to the original through-type jacks, and are widely used in various pre-tensioning and post-tensioning methods in the pre-stress construction process.