Sleeper grasping device and ballast bed track construction and maintenance device

The invention belongs to the field of track traffic, and particularly relates to a sleeper grasping device and a ballast bed track construction and maintenance device. The sleeper grasping device comprises a connecting frame (1), a swinging frame (2) and a track clamp (3); the connecting frame (1) comprises at least two connecting plates, and the connecting plates are provided with pin holes and connected with a mechanical arm through the pin holes; the swinging frame (2) comprises at least two installation plates, the installation plates are provided with pin holes and connected with the connecting frame (1) through the pin holes, and the installation plates can rotate relative to the connecting frame (1); the track clamp (3) comprises at least two pairs of track clamp legs, the track clamp legs are installed on the installation plates and can rotate relative to the installation plates, the tops of each pair of track clamp legs are connected through a clamping oil cylinder (31), and the track clamp legs cond