Introduction to self-locking hydraulic jacks
Self-locking hydraulic jacks are mainly used in occasions where heavy loads need to be borne for a long time, and when the hydraulic pressure is withdrawn, they can still support heavy loads, safely and reliably.
The design of self-locking jack is a perfect combination of hydraulic principle and mechanical principle, there are threads in the piston rod throughout the entire range of travel, after full jacking, rotate the retaining ring until it is against the cylinder, the retaining ring and the cylinder is under force, you can unload the oil pump, to achieve the jack’s self-locking, so as to achieve the long term support of the weight. It is mainly used for equipment installation in electric power, construction, machinery manufacturing, mining, railway and bridge, shipbuilding and other industries, as well as continuous support and testing operations of trusses and bridges.
How the Self-Locking Hydraulic Cylinder works
The rod-piston group is composed of a floating piston and high-resistance floating sectors. When the rod-extended motion begins, the sectors stay closed until they meet with a groove machined on the inside of the body. At this point, the cone-section shaped piston will expand the sectors, which will fill up the space between the piston and the body, firmly locking it in the rod-extended position. Any force vector coming from the molded material will be relieved through the sectors and along the reinforced body, thanks to the accurately engineered angles among the components. Everything can be kept in place with a minimum pressure inside of the chamber. When it’s time to unlock the cylinder, the oil getting inside of the cylidner pushes the piston downwards, giving room for the sectors to collapse back to their original position. The rod will then be free to retract, completing the cycle.
The use of self-locking hydraulic jack.
1, must check whether the components are normal before use.
2, the use of self-locking hydraulic jack, should strictly comply with the provisions of the main parameters. Avoid excessive overload and partial load. Otherwise, when the lifting height or lifting weight exceeds the specified level, serious oil leakage will occur at the top of the self-locking jack.
3, the choice of the centre of gravity of the weight to live in, self-locking hydraulic jacks to choose a reasonable centre of gravity, the bottom surface should be flat, and at the same time, we should consider the softness of the ground, whether it is necessary to pad the tough wooden
Material, placed whether smooth, to avoid the load sinking or tilting.
4, self-locking jack jacking up heavy objects, should be promptly screwed from the top of the piston rod nut to the top of the cylinder, it is strictly prohibited to use hydraulic pressure as a self-locking jack support
5, When multiple self-locking hydraulic jacks are lifting at the same time, please use the CLL series of self-locking hydraulic jacks from High-Tech. In addition to the correct placement of the self-locking jacks, you should also use multiple jack diverter valves and balance the load of their respective locking jacks, taking care to keep the jacking speeds synchronised. It is also necessary to consider the possibility of ground subsidence due to uneven weight to prevent the heavy load from tilting and becoming dangerous.
6, When using, first connect the quick connector of the manual oil pump, then choose a good position, tighten the oil drain screw on the oil pump, you can work. To drop the piston rod, the manual oil pump handwheel counterclockwise slightly loosened, the cylinder unloading, the piston rod gradually decline. Otherwise, it will be dangerous to descend too fast.
7, After the lifting is finished, it can be taken out quickly, but you can’t pull the self-locking jack with the connected hose.
8, The self-locking hydraulic jack should be prevented from violent vibration during use.
9, The self-locking jack should not be used in workplaces with acid, alkali and corrosive gases.
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