The universal hydraulic jack is suitable for all kinds of lifting operations with low lifting height. It consists of oil chamber 1, oil pump 2, oil storage chamber 3, piston 4, rocker 5, oil valve 6 and other main parts.
When working, as long as the crank is reciprocated, the manual oil pump continuously presses the oil into the cylinder. As the oil pressure in the cylinder increases, the piston and the heavy objects on the piston are forced to move upward together. When the oil return valve is opened, the high-pressure oil in the oil cylinder flows back to the oil storage chamber, so that the heavy object and the piston also fall together.
Special hydraulic jacks enable special tensioning tools to apply tension to prestressed steel bars when making prestressed concrete members. Special hydraulic jacks are mostly double-acting. Commonly used are both through-heart type and cone-anchor type.
The through-heart type jack is suitable for tensioning tendons or wire bundles, and is mainly composed of a tensioning cylinder, a pressing cylinder, a pressing piston and a spring. It is characterized in that there is a through-hole in the axis of the stretching machine, and the steel bar (the steel wire) is inserted and anchored by the tool anchor of the tail.
When pulling, open the front and rear nozzles, supply oil from the rear nozzle to the tensioning working oil chamber, and pull the cylinder to move backward. Since the cylinder cable is anchored to the tool anchor at the top of the jack, the jack elongates the cable by means of a tool. When the cable is pulled to the required length, the rear nozzle is closed, and the oil is sucked from the front nozzle into the top cylinder, so that the piston of the top cylinder is extended forward to withstand the anchor plug, and the anchor plug is pressed into the anchor ring. Thereby anchoring the cable. Open the rear nozzle and continue to feed oil from the front nozzle. At this time, the tension cylinder moves forward and the oil in the cylinder returns. Finally, the front oil nozzle is opened to return the oil in the top pressure cylinder, and the top pressure piston is restored by the action of the return spring.
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Label: General and special two-category for hydraulic jacks
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