Plectrum structure for preventing oil storage tank from overflowing

The utility model discloses a shifting piece structure for preventing an oil storage tank from overflowing, which comprises a traction rope and a shifting piece sleeved on the surface of the traction rope, connecting structures are arranged on the left side and the right side of the surface of the shifting piece, and a transmission structure positioned at the bottom of the connecting structures is arranged at the bottom of the shifting piece. The connecting structure comprises connecting blocks arranged on the two sides of the top of the shifting piece, and the connecting blocks are fixedly connected with the shifting piece. The transmission structure is pushed to be separated from the side plates, the clamping plates without extrusion can swing with the pin shafts in the connecting blocks as the axes, when the clamping plates are separated from the traction rope, a user can push the shifting piece to make the shifting piece slide and move on the surface of the traction rope, the height of an existing shiftin