Hydraulic bottle jacks are divided into: general hydrau […]
Hydraulic bottle jacks are divided into: general hydraulic bottle jacks, special hydraulic bottle jacks.
General hydraulic bottle jacks are suitable for a variety of lifting operations with little lifting height. It consists of: 1, oil chamber 2, oil pump 3, oil reservoir 4, piston, 5, crank, 6, oil valve and other major components. During work, as long as the handle is reciprocated, the manual oil pump continuously pressurizes the oil in the oil cylinder. Because the oil pressure in the oil cylinder is continuously increased, the piston and the weight on the piston are forced to move upward together. When the return valve is opened, the high-pressure oil in the cylinder will flow back to the oil reservoir, and the weight and the piston will fall together.
Dedicated hydraulic bottle jacks are dedicated tensioning tools that apply tension to prestressed reinforcements when making prestressed concrete elements. Dedicated hydraulic jacks are mostly double acting. There are two kinds of pass-through type and cone anchor type.
Feed-through jacks are suitable for tensioning tendons or wire bundles. They are mainly composed of tension cylinders, top pressure cylinders, top pressure pistons and springs. Its characteristic is: along the axial center of the stretcher, there is a through-hole, and after the reinforcement (or steel wire) penetrates, it is anchored by the tool anchor of the tail.
When pulling, open the front and rear grease nipples, pull the oil from the rear nozzle to the working oil chamber, and pull the cylinder to move backwards. Since the cylinder cable is anchored on the tool anchor at the top of the jack, the jack elongates the cable through a tool. When the cable is stretched to the required length, the rear nozzle is closed, and the oil is fed from the front nozzle to the top pressure cylinder, so that the piston of the top pressure cylinder extends forward and resists the anchor plug, and the anchor plug is pressed into the anchor ring. As a result, the steel cable is anchored. After opening the rear nozzle and continuing to feed oil from the front nozzle, the tension cylinder moves forward and the oil in the cylinder returns. Finally, the front nozzle is opened to return the oil in the top pressure cylinder, and the top pressure piston is reset due to the action of the return spring.