Hydraulic jacks are mainly lifting equipment that rely on hydraulic drive systems to vertically lift heavy objects, with the ability to lift thousands of tons of heavy objects. However, they do not have the function of supporting heavy objects themselves, so there is no safety hazard for the heavy objects to temporarily stay on the top cover of the jack. However, once the thousands of tons of heavy objects are supported for a long time, it is inevitable that the heavy objects will capsize due to "insufficient body force". Is there not a hydraulic jack among many different types of jacks that can simultaneously lift and support heavy objects?

Ordinary types of hydraulic jacks such as hydraulic jacks, claw jacks, and horizontal jacks that we usually use belong to the category of hydraulic jacks. These jacks are small in size and only have basic lifting functions, which cannot withstand the high pressure of heavy objects for a long time. Even if steel materials with high compressive strength and bending strength are used to manufacture the body, it is difficult to guarantee that the jack can support heavy objects continuously for ten days or six months.

The coal mining industry has relatively high requirements for the support function and pillar function of hydraulic jacks. The hydraulic support jacks commonly used in the coal mining industry are supplied with oil from the outside, which can ensure that the hydraulic oil is always in sufficient condition, with high strength and strong support capacity. They have both support function and lifting function.