wheel motor 231 and an adjustment member 232 the conveyer motor 221 and the abrasive belt wheel motor 231 are electrically connected with a power source 240 respectively the digital panel of the belt sander comprises a control module 10 a detection module 20 a digital display module 30 and an operation module 40 the control module 10 referring to fig4 comprises a motor drive member 11 a conveyer motor control member 12 and an adjustment unit 13 the motor drive member 11 is electrically connected with the abrasive belt wheel motor 231 the conveyer motor control member 12 is electrically connected with the conveyer belt motor 221 the adjustment member 232 is longitudinally disposed on the main body 210 and coupled with the abrasive belt wheel assembly 230 the abrasive belt wheel assembly 230 can be adjusted by the adjustment member 232 to move longitudinally the detection module 20 referring to fig5 is electrically connected with the control module 10 the detection module 20 comprises a conveyer rotation speed detection member 21 and an abrasive belt wheel motor position detection member 22 the conveyer rotation speed detection member 21 is disposed at the position where an output shaft of the conveyer motor 221 is located the abrasive.