Actuator, remote triggering device, governor assembly and elevator

An actuator, comprising:

• a mandrel, the mandrel having a proximal end and a distal end, and the mandrel being driven to move from a contraction position toward an actuation position;
• a mandrel sleeve, the mandrel sleeve being sleeved on the distal end of the mandrel;
• and
• a shell, the shell defining a channel,
• wherein the actuator further comprises at least one sliding member, and when the mandrel moves from the contraction position toward the actuation position, the at least one sliding member is located at a first radial position where the mandrel is joined to the mandrel sleeve, such that the mandrel sleeve can move along the channel together with the mandrel;
• and wherein
• at the actuation position, the at least one sliding member moves outward radially to a second radial position where the mandrel sleeve is joined to the shell, thus locking the mandrel sleeve;
• wherein the mandrel comprises a mandrel stick located at the proximal end and a mandrel rod located at the distal end and connected to the mandrel stick;
• wherein a coil is arranged at the periphery of the mandrel stick, and the mandrel stick is made of a magnetic material, wherein the mandrel is driven to the actuation position by a magnetic field generated by the coil when the coil is powered on.