Linear displacement self-homing mechanism and assembling method thereof

The invention relates to a linear displacement self-homing mechanism which comprises a shell, a linear displacement rod and a shell adjusting nut. The right end of the linear displacement rod is sequentially sleeved with a first guide spring cushion, a return spring and a second guide spring cushion. A linear displacement rod adjusting nut is arranged on the linear displacement rod and used for adjusting the compression amount of the return spring, and the linear displacement rod adjusting nut is locked on the linear displacement rod through a first locking screw and a second locking screw. The linear displacement rod is placed in the right cylinder of the shell and is limited by using the shell adjusting nut, so that the left side of the first guide spring pad is in contact with the right step plane of the right cylinder of the shell and the right shoulder of the linear displacement rod at the same time; the right side of the second guide spring pad is simultaneously contacted with the left sides of the line