Conveying belt tensioning device and belt conveyor

The invention discloses a conveying belt tensioning device and a belt conveyor. The conveying belt tensioning device comprises a support (3), a connecting rope (6), a first pulley (4) fixed to the support (3) and used for changing the direction of the connecting rope (6), and a balance weight (2) used for tensioning the connecting rope (6). The conveying belt tensioning device further comprises a connecting rope collecting and releasing device (7) used for releasing or collecting the connecting rope (6) so that when the belt conveyor works, the connecting rope (6) can be released or collected according to the stress conditions of the connecting rope (6), and the position of the balance weight (2) can keep unchanged or basically keep unchanged. By means of the conveying belt tensioning device, the maximum load borne by the connecting rope and a connecting piece can be reduced, and therefore the connecting failure is avoided. 本发明公开了一种输送带张紧装置及带式输送机，所述输送带张紧装置包括支架(3)、连接绳(6)、固定在所述支架(3)上用于改变所述连接绳(6)方向的第一滑轮(4)和用于张紧所述