（1）Scale capacity,the maximum throughput of conveyor provided by the user,the unit is t/h.

（2）The length of belt is in metres.

（3）The accurate test time is in seconds.

（4）The number of belt loops and testing time,generally speaking the number of belt loops is not less than three laps,time is not less than three minutes ;

When belt conveyor in operation,deviation phenomenon often occurs.Although theoretically as long as the conveyor in middle,hopper calibration,so that it will not blanking on the deviation,but in actual operation there is still often appear no-load operation and the tape is not loaded deviation problems.The belt deviation of belt conveyor is mainly caused by the eccentric accumulation of materials,uneven distribution of tension along the bandwidth.

Point on the tape when feeding feeding error,plus or minus two conveyors in case of vertical connection,the materials in the front conveyor belt throw a parabola,form fabrics uneven,may lead to accumulation of material eccentric.

In order to avoid the eccentric accumulation of belt conveyor in loading materials,install of one pair of guide rollers and the guide plate on both sides of the tape in the feed point,then install the guide plate in the vertical connection of two conveyors,and frequently check the adjustment guide plate,make the fabric middle.But also can reduce the bulk materials  have the direct impact on the belt conveyor.

The counterweight in the counterweight basket place in the wrong place or there are debris in the counterweight basket,will cause the tape uneven force,the tape will be deformable after a period of use;the quality of the tape and the uneven force inequality and other reasons,while one side of the tape is tightening and the other side is loose;the interfaces of the belt do not correct,caused the belt tension uneven distribution.The solution is to make with heavy rail neatly,clearn the debris in the counterweight basket;adjust roller bearing top wire,align the deviation of the belt conveyor.