Massage spacing adjusting structure and shoulder-neck massage machine core

A massage spacing adjusting structure, comprising:

• an adjusting motor, an adjusting transmission assembly, two adjusting screw rods, two adjusting seats, two connecting seats and a limiting mechanism, wherein the adjusting transmission assembly connects the adjusting motor and the two adjusting seats, and the two adjusting screw rods, the two adjusting seats and the two connecting seats are symmetrically arranged on a long rotating shaft of a massage machine core respectively;
• the adjusting seats are connected to the adjusting transmission assembly, a center of each adjusting seat has an internal thread, the adjusting screw rods have external threads in threaded fit with the internal threads of the adjusting seats, one end of each adjusting screw rod is connected to the corresponding adjusting seat, and the other end thereof and a massage assembly are fixed together through the corresponding connecting seat;
• and the limiting mechanism comprises conducting probes and conducting electrode plates, the conducting probes are connected to a circuit board, the conducting electrode plates synchronously move with the adjusting screw rods, a distance between the two conducting probes is less than or equal to a length of the external thread of each adjusting screw rod, and the conducting electrode plates are located between the two conducting probes.