Double acting self-locking hydraulic jack

  This paper briefly introduces the double acting self-locking hydraulic jack: the built-in protection valve will not make the pressure of the piston rod return too high
Dust ring design can reduce pollution and prolong service life
Hard deep groove saddle is provided as standard, and the saddle can be tilted to adapt to the uneven condition of components
The optional tubular or plate hydraulic check valve or one-way throttle valve ensures the jacking and lowering process
Hydraulic jack is divided into general hydraulic jack and hydraulic jack The universal hydraulic jack is suitable for various lifting operations with small lifting height
It consists of: 1, oil chamber 2, oil pump 3, oil storage chamber 4, piston, 5, crank, 6, oil valve and other main parts
During operation, as long as the rocker is pulled back and forth, the manual oil pump will continuously press oil into the oil cylinder
Due to the continuous Zeng high oil pressure in the oil cylinder, the piston and the weight on the piston will be forced to move upward together
Open the oil return valve, the high-pressure oil in the oil cylinder will flow back to the oil storage chamber, so the weight and piston will fall together Hydraulic jack is a tensioning machine, which applies tension to prestressed reinforcement when making prestressed concrete components
Hydraulic jacks are mostly double acting
There are two types commonly used: through core type and cone anchor type The through core jack is suitable for tensioning tendon or steel wire bundle
It is mainly composed of tensioning cylinder, jacking cylinder, jacking piston and spring
The utility model is characterized in that there is a through hole along the axis of the stretching machine, and the reinforcement (or steel wire) is anchored by the tool anchor at the tail after penetrating During tensioning, open the front and rear oil nozzles, supply oil to the tensioning oil chamber from the rear oil nozzle, and the tensioning cylinder block moves backward
Since the cylinder cable is anchored on the tool anchor at the jack layer, the jack lengthens the steel cable through the tool
When the steel cable is tensioned to the required length, close the rear oil nozzle, feed oil from the front oil nozzle into the top pressure cylinder, make the piston of the top pressure cylinder extend forward to hold the anchor plug, and press the anchor plug into the anchor ring to anchor the steel cable
Open the rear oil nozzle and continue to feed oil from the front oil nozzle
At this time, the tensioning cylinder moves forward and the oil in the cylinder returns
Then open the front oil nozzle to make the oil in the jacking cylinder return, and the jacking piston returns to its original position due to the action of the return spring
Model: mj50-500 tonnage: 50t stroke: 100 ~ 500mm body height: 225 ~ 625mm extension height: 325 ~ 1125mm cylinder outer diameter: 127mm piston rod diameter: 70mm cylinder inner diameter: 100mm weight: 35 ~ 63kg Model: mj100-500 tonnage: 100 t stroke: 100 ~ 500 body height: 250 ~ 650 mm extension height: 350 ~ 1150 mm cylinder outer diameter: 180 mm piston rod diameter: 100 mm cylinder inner diameter: 140 mm weight: 58 ~ 130kg , Model: mj150-500 tonnage: 150 t stroke: 100 ~ 500 body height: 260 ~ 660mm extension height: 360 ~ 1160mm cylinder outer diameter: 219mm piston rod diameter: 125mm cylinder inner diameter: 180mm weight: 58 ~ 255kg Model: mj500-500 tonnage: 500t stroke: 100 ~ 500 body height: 360 ~ 760mm extension height: 460 ~ 1260mm cylinder outer diameter: 430mm piston rod diameter: 200mm cylinder inner diameter: 320mm weight: 323 ~ 599kg​