An intermittent lifting assembly , configured to drive a heat dissipation panel of a mobile terminal to open and close, comprising: a first driving piece , comprising a first intermittent gear and a convex shoulder ; wherein the convex shoulder is cylindrical and is disposed at an end of the first intermittent gear and is disposed coaxially with the first intermittent gear ; and a second driving piece , comprising a second intermittent gear engaged with the first intermittent gear , and a swing rod and a position-limiting slot wherein the position-limiting slot is an arc-shaped position-limiting slot and is disposed on the second driving piece ; the swing rod is fastened to the second intermittent gear or the swing rod and the second intermittent gear are of an integrated structure, and the swing rod is configured to be slidably connected to the heat dissipation panel ; and a gap for avoiding the second intermittent gear is disposed on the convex shoulder , and a vertical projection of the teeth of the first intermittent gear onto a first plane falls within a vertical projection of the gap onto the first plane, wherein the first plane is a plane away from the first intermittent gear of the convex shoulder ; and when the first intermittent gear rotates relative to the second intermittent gear , if teeth of the first intermittent gear and teeth of the second intermittent gear are out of an engaged state, the convex shoulder rolls in the position-limiting slot ; if the teeth of the first intermittent gear and the teeth of the second intermittent gear are in the engaged state, the first intermittent gear rotates to drive the second intermittent gear to rotate, and the second intermittent gear drives the swing rod to rotate to drive the heat dissipation panel to open or close. a first driving piece , comprising a first intermittent gear and a convex shoulder ; wherein the convex shoulder is cylindrical and is disposed at an end of the first intermittent gear and is disposed coaxially with the first intermittent gear ; and a second driving piece , comprising a second intermittent gear engaged with the first intermittent gear , and a swing rod and a position-limiting slot wherein the position-limiting slot is an arc-shaped position-limiting slot and is disposed on the second driving piece ; the swing rod is fastened to the second intermittent gear or the swing rod and the second intermittent gear are of an integrated structure, and the swing rod is configured to be slidably connected to the heat dissipation panel ; and a gap for avoiding the second intermittent gear is disposed on the convex shoulder , and a vertical projection of the teeth of the first intermittent gear onto a first plane falls within a vertical projection of the gap onto the first plane, wherein the first plane is a plane away from the first intermittent gear of the convex shoulder ; and when the first intermittent gear rotates relative to the second intermittent gear , if teeth of the first intermittent gear and teeth of the second intermittent gear are out of an engaged state, the convex shoulder rolls in the position-limiting slot ; if the teeth of the first intermittent gear and the teeth of the second intermittent gear are in the engaged state, the first intermittent gear rotates to drive the second intermittent gear to rotate, and the second intermittent gear drives the swing rod to rotate to drive the heat dissipation panel to open or close. <EOS>