Single-pillow tamping unit, double-pillow tamping device and multi-pillow tamping device

The invention relates to a single-sleeper tamping unit, a double-sleeper tamping device and a multi-sleeper tamping device, and belongs to the field of rail transit, and the single-sleeper tamping unit comprises a box body, an eccentric shaft, a connecting rod, a rocker, two clamping oil cylinders and two clamping pickaxe arms; one end of the connecting rod is hinged with the eccentric section of the eccentric shaft; the second connecting part of the rocker is hinged with the box body to form a third hinge point; the two preset portions of the rocker are hinged to one ends of the two clamping oil cylinders correspondingly, the other ends of the two clamping oil cylinders are hinged to the two clamping pickaxe arms correspondingly, and the two clamping pickaxe arms are further hinged to the box body correspondingly. Wherein one clamping oil cylinder and the corresponding clamping pickaxe arm are both located on the left side of the rocker, and the other clamping oil cylinder and the corresponding clamping pick