Tightness counterweight device of belt conveyor

The utility model discloses an elastic counterweight device of a belt conveyor, and particularly relates to the field of elastic counterweight devices, the elastic counterweight device comprises an elastic counterweight sand box, a placing pad is fixed at the bottom of the elastic counterweight sand box, and the top of the elastic counterweight sand box is rotatably connected with a movable cover through a rotating shaft; the device is provided with an adjusting and closing device, when the balance weight in the elastic balance weight sand box needs to be adjusted, a movable cover at the top of the elastic balance weight sand box can be opened, balance weight objects in the elastic balance weight sand box can be placed and taken, and closing and locking can be conveniently completed after balance weight adjustment is completed; the purpose that the weight of the balance weight is easy to adjust is achieved, and therefore it is guaranteed that the belt conveying goods section on the upper portion obtains the m