Clamping mechanism

A clamping mechanism, comprising:

• a mounting member defining a receiving hole axially and at least two mounting holes radially, the at least two mounting holes communicating with the receiving hole;
• at least two sealing assemblies each comprising a top seal and a bottom seal sealing opposite ends of a corresponding mounting hole, the top seal being adjacent to the receiving hole and defining an axial hole thereon;
• at least two clamping assemblies slidably received in the at least two mounting holes respectively, each clamping assembly comprising a holding member and a piston, a first end of the holding member extending through the axial hole of the top seal and received in the receiving hole, a second end of the holding member being received in the mounting hole, the piston being fixed to the second end of the holding member and dividing the mounting hole into a first chamber and a second chamber separating from the first chamber;
• a plurality of adjusting valves respectively communicating with the first chambers and the second chambers of the at least two mounting holes;
• and
• a connecting member received in the receiving hole, wherein the connecting member comprises a connecting portion and a holding portion coaxial with the connecting portion, the connecting portion protrudes out of the mounting member, the holding portion is received in the receiving hole and radially defines at least two holding holes along a circumferential face, and the second end of each holding member is received corresponding holding holes, thereby holding the connecting member.