Bucket elevator

A bucket elevator comprises a shell; a head part is arranged on the upper portion of the shell, and a tail part is arranged on the lower portion of the shell. A driving device and a head wheel are connected through a transmission chain, and the driving device and the head wheel are fixedly mounted on the head part. A discharging opening is formed in one side of the head part, and a feeding opening is formed in one side of the tail part. A tail wheel is mounted on the tail part, and a chain rounds the head wheel and the tail wheel to form a closed annular structure. Buckets are fixed on the chain, and an adjusting screw rod and a counterweight tensioning device are mounted on the tail part. An inspection door is arranged in the middle of the shell. The bucket elevator has the automatic chain tensioning function and does not need to be adjusted manually. Meanwhile, it is guaranteed that the chain is normally engaged with the head wheel and the tail wheel, and equipment failure is avoided.