Limiting collision block and limiting device

The invention discloses a limiting collision block and a limiting device. The limiting collision block comprises a base, a mandrel, a limiting structure, an anti-loosening device, and a spring; the base is provided with a first connecting hole; the mandrel penetrates through the first connecting hole and can slide in the first connecting hole; the limiting structure is arranged at the end, away from the first connecting hole, of the mandrel; the limiting structure is located at a first preset position and can make contact with a limiting collision head to generate interaction force; the anti-loosening device is arranged on one side of the first connecting hole; the spring penetrates through the mandrel and is in a compressed state; the spring is located between the base and the limiting structure; and the compression force of the spring is larger than the interaction force generated when the limiting collision head makes contact with the limiting structure. In application, the base connected with a moving par