Self locking hydraulic jacks are mainly used in places where heavy objects need to be supported for a long time. After removing the oil pressure, it can still support heavy objects, ensuring safety and reliability. It can be used underwater, single acting, with load retraction and self-locking of nuts, making the load safer. Especially in large projects, operational control is convenient. It is designed with a pressure maintaining device and a built-in pressure reducing valve to prevent overload protection. These designs are used to protect the safe operation of the jack. The jack is connected by a high-pressure hose and a threaded joint, which is quick to use and overcomes the problem of oil leakage from traditional quick joints. It is mainly used for equipment installation, hoisting and dismantling operations in power, construction, machinery and other industries manufacturing, mining, railway, bridge and shipbuilding.
The operating principle of the self-locking hydraulic jack is mainly through the use of mechanical principles, and then the handle is pulled back and forth, and the ratchet is pushed to rotate in the gap by pulling out the claws. The small bevel gear drives the large bevel gear to rotate the lifting screw, so that the lifting sleeve is lifted, so To achieve the effect of lifting tension, for the jack through the lever and gear, the rack is driven by manpower to lift the heavy object, which can support the heavy object for a long time, the lifting capacity can reach 100 tons, and the heavy object can be moved laterally within a small distance .

The design of the self-locking hydraulic jack is a perfect combination of the principle of the hydraulic system and the principle of mechanical work. The piston rod has a thread through the development of the entire stroke range. The cylinder body is supported by the stop ring and the cylinder body, so that we can remove the oil pump to realize the self-locking of the hydraulic jack, especially suitable for continuous technical support of concrete beams and concrete bridges and test student work.

The self-locking nut makes the load safer, and can withstand the eccentric load up to 10% of the rated environmental load management capacity of the hydraulic jack. The overflow hole also has the function of limiting the free travel. In terms of application, it is mainly suitable for power plants, petroleum Chemical industry, mechanical manufacturing installation and mechanical locking of curved bridge positioning. This product has the characteristics of small size, convenient use, flexible operation, labor-saving work, easy portability, saving installation time, and improving work efficiency.

But we must remember that when using the self-locking hydraulic jack, the high-pressure oil pipe has passed the test of 105Mpa (1050Kgf/cm2) before leaving the factory, but because the hose is easy to age, the user should check it frequently, usually six months, and use it frequently It takes three months to check the pressure of 87.5 MPa (875kPa/cm2). If there is a burst, bulge or leak, it must not be used.
Characteristics of self-locking hydraulic jacks:
1) Single acting hydraulic jack.
2) The nut can automatically lock, making the load safer.
3) Specially made composite material coating, with stronger corrosion resistance and less friction.
4) The overflow hole has the function of limiting travel.
5) There is a circular spherical gasket at the top of the piston rod, which allows for a bias coefficient of about 8% to maintain the pressure of the jack
Balance makes Jack live longer.
6) The self-locking hydraulic jack can be customized into a double acting hydraulic jack according to customer requirements, but the closing height needs to be increased.

Purpose of self-locking hydraulic jack:
1) If the oil level in the pump is insufficient, the working oil (10 #) should be injected before starting work.
2) Estimate the tonnage and prohibit overloading.
3) Determine the center of gravity of the jack, find the point of force, and consider the softness and hardness of the ground. Do you need to add a wooden board to prevent the jack from tilting during lifting.
4) After lifting a heavy object with a jack, hard wood should be used to support the object. It is prohibited to use a jack as a support to prevent imbalanced load and the risk of tilting.
5) When working, first connect the quick coupling to the jack, select a suitable position, tighten the oil pump bolts, and then start working. Loosen the bolts and unload the oil cylinder.

If you want to buy a self-locking jack, please contact us in time, email: sales1@leadcrete.com