Jacks are mainly divided into two categories: mechanical jacks and hydraulic jacks. Next, let's talk about the working principle of mechanical jacks.

Mechanical jacks obtain lifting or lowering force by reciprocating the handle. When we pull the handle back and forth, the small umbrella gear inside the mechanical jack will drive the large umbrella gear to rotate, thereby achieving the lifting action.

As for the descent operation, the process is also relatively simple. Simply move the block of the jack to the opposite position, then turn the handle, and the lifting cylinder of the jack will descend, achieving the purpose of lowering.

When using a mechanical jack for work, whether it is lifting or lowering, it should be operated according to the required specifications to ensure safe completion of heavy lifting operations and improve work efficiency.

In terms of ease of operation, mechanical jacks are inferior to hydraulic jacks. However, the cost of hydraulic jacks is relatively higher.