Tension device for belt conveyor

The invention discloses a tension device for a belt conveyor, belongs to the technical field of mechanical-electrical integration and can be widely used in coal, metallurgy, power generation and other industries employing belt conveyors. The invention is characterized in that: the device simultaneously has dual functions of tensioning and offsetting a conveyer belt; and the complete-set device consists of two sets of identical and mutually independent traction systems, a movable trolley 3, a tensioning roller 4 and a redirecting roller 9, wherein a control system consists of a left-side tension sensor 5, a right-side tension sensor 12, a programmable logic controller 16, an analog quantity input module 17 and a relay. Compared with the traditional combined tension device, the tension device is not provided with a hydraulic pump station, a hydraulic cylinder and an energy storage station, and the advantage of relatively much smaller occupied area is more important under a well. The novel tension device can become an updated product of the traditional tension device for the belt conveyor.