Simple chain tightener for scraper conveyor

The simple chain tightener comprises a steel plate I, a steel plate II, a chain ring I, a chain ring II, a reinforcing steel bar I, a reinforcing steel bar II, a reinforcing steel bar III, a steel plate III, a steel plate IV, a chain ring III and a chain ring IV, the chain ring I and the chain ring II are fixedly connected between the steel plate I and the steel plate II, and the chain ring III and the chain ring IV are fixedly connected between the steel plate III and the steel plate IV. One ends of the steel bars I, II and III are fixedly connected to the steel plate II, and the other ends of the steel bars I, II and III are fixedly connected to the steel plate III; in the construction process, the scraper conveyor does not need to frequently connect a chute and pinch a chain, the extension difficulty of a heavy chute and a chain ring does not need to be increased, the labor operation intensity of workers is reduced, the transfer operation speed cannot be tunneled, and the labor productivity of teams and gr