Abstract:
A digital panel of a belt sander includes a control module. The control module is electrically connected with a conveyer motor and an abrasive belt wheel motor of the belt sander. The control module is connected with a detection module. The control module is further connected with a digital display module and an operation module. Thereby, the operation module controls the conveyer motor and the abrasive belt wheel motor of the belt sander, and detects the running state of the conveyer motor and the abrasive belt wheel motor through the detection module, and displays the running data of the conveyer motor and the abrasive belt wheel motor through the digital display module for the belt sander to be digitalized.

Description:
BACKGROUND OF THE INVENTION 
     1. Field of the Invention 
     The present invention relates to a belt sander, and more particularly to a digital panel of a belt sander. 
     2. Description of the Prior Art 
     A conventional belt sander comprises an immovable chassis and a movable workbench which can be adjusted up and down. In order to know the displacement distance of the workbench relative to the chassis, the chassis is provided with a dial indicator and the workbench is provided with an indicator relative to the dial indicator. The indicator is moved on the dial indicator according to the displacement distance of the workbench relative to the chassis, providing a scale indication effect. 
     However, the displacement distance of the workbench relative to the chassis is limited. Therefore, the displacement distance of the workbench relative to the chassis corresponds to the relative movement distance of the indicator on the dial indicator. The movement distance is very small. When the user reads the scale, due to the small interval between the scales, he/she cannot see the scale clearly. It is not easy to read the scale correctly. The user often knows an approximate value by the naked eye. It is not convenient for use. The measurement may be incorrect, so the processing precision cannot be improved, resulting in bad quality. Accordingly, the inventor of the present invention has devoted himself based on his many years of practical experiences to solve these problems. 
     SUMMARY OF THE INVENTION 
     The primary object of the present invention is to provide a digital panel of a belt sander to digitalize the belt sander for displaying the operation information and running state clearly so as to enhance the convenience of use, the processing precision, and processing quality. 
     In order to achieve the aforesaid object, the digital panel is disposed on the belt sander. The belt sander comprises a main body. The main body is transversely provided with a conveyer assembly and an abrasive belt wheel assembly. The conveyer assembly comprises a conveyer motor. The abrasive belt wheel assembly comprises an abrasive belt wheel motor and an adjustment member. The conveyer motor and the abrasive belt wheel motor are electrically connected with a power source, respectively. The digital panel of the belt sander comprises a control module, a detection module, a digital display module, and an operation module. The control module comprises a motor drive member, a conveyer motor control member, and an adjustment unit. The motor drive member is electrically connected with the conveyer motor and the abrasive belt wheel motor, respectively. The conveyer motor control member is electrically connected with the conveyer belt motor. The adjustment member is longitudinally disposed on the main body and coupled with the abrasive belt wheel assembly. The abrasive belt wheel assembly is adjustable by the adjustment member to move longitudinally. The detection module is electrically connected with the control module. The detection module comprises a conveyer rotation speed detection member and an abrasive belt wheel motor position detection member. The conveyer rotation speed detection member is disposed at the position where an output shaft of the conveyer motor is located. The abrasive belt wheel motor position detection member is disposed at the position where the adjustment member is located. The digital display module comprises a power display unit, a conveyer motor rotation speed display unit, an abrasive belt wheel assembly longitudinal position display unit, and a current load display unit. The power display unit is electrically connected with the power source for showing the power to be turned on/off. The conveyer motor rotation speed display unit is electrically connected with the conveyer rotation speed detection member. The abrasive belt wheel assembly longitudinal position display unit is electrically connected with the abrasive belt wheel motor position detection member. The current load display unit is electrically connected with the power source. The operation module comprises a power switch module, an abrasive belt wheel motor switch module, a conveyer motor switch module, and an emergent stop module. The power switch module is electrically connected with the power source. The abrasive belt wheel motor switch module is electrically connected with the abrasive belt wheel motor. The conveyer motor switch module is electrically connected with the conveyer motor. The emergent stop module is electrically connected with the control module. 
     Thereby, the operation module controls the conveyer motor and the abrasive belt wheel motor of the belt sander, and detects the running state of the conveyer motor and the abrasive belt wheel motor through the detection module, and displays the running data of the conveyer motor and the abrasive belt wheel motor through the digital display module for the belt sander to be digitalized. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
         FIG. 1  is a perspective view of the present invention; 
         FIG. 2  is an exploded view of the present invention; 
         FIG. 3  is a block diagram of the present invention; 
         FIG. 4  is a block diagram of the control module of the present invention; 
         FIG. 5  is a block diagram of the detection module of the present invention; 
         FIG. 6  is a block diagram of the digital display module of the present invention; and 
         FIG. 7  is a block diagram of the operation module of the present invention. 
     
    
    
     DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS 
     Embodiments of the present invention will now be described, by way of example only, with reference to the accompanying drawings. 
       FIG. 1  is a perspective view of the present invention.  FIG. 2  is an exploded view of the present invention.  FIG. 3  is a block diagram of the present invention. The present invention discloses a digital panel of a belt sander. The digital panel is disposed on a belt sander  200 . The belt sander  200  comprises a main body  210 . The main body  210  is transversely provided with a conveyer assembly  220  and an abrasive belt wheel assembly  230 . The conveyer assembly  220  comprises a conveyer motor  221 . The abrasive belt wheel assembly  230  comprises an abrasive belt 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  FIG. 4 , 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  FIG. 5 , 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 belt wheel motor position detection member  22  is disposed at the position where the adjustment member  232  is located. Wherein, the conveyer rotation speed detection member  21  comprises a first Hall IC  211  and a first magnetic ring  212 . The first Hall IC  211  is disposed on the conveyer motor  221 . The first magnetic ring  212  is disposed on the rotation shaft of the conveyer motor  221 . The first magnetic ring  212  has  24  poles. The abrasive belt wheel motor position detection member  22  comprises a second Hall IC  221  and a second magnetic ring  222 . The second Hall IC  221  and the second magnetic ring  222  are disposed on the adjustment member  232 , respectively. The second magnetic ring  222  has  40  poles. 
     The digital display module  30 , referring to  FIG. 6 , comprises a power display unit  31 , a conveyer motor rotation speed display unit  32 , an abrasive belt wheel assembly longitudinal position display unit  33 , and a current load display unit  34 . The power display unit  31  is electrically connected with the power source  240  for showing the power to be turned on/off. The conveyer motor rotation speed display unit  32  is electrically connected with the conveyer rotation speed detection member  21 . The abrasive belt wheel assembly longitudinal position display unit  33  is electrically connected with the abrasive belt wheel motor position detection member  22 . The current load display unit  34  is electrically connected with the power source  240 . 
     The operation module  40 , referring to  FIG. 7 , comprises a power switch module  41 , an abrasive belt wheel motor switch module  42 , a conveyer motor switch module  43 , and an emergent stop module  44 . The power switch module  41  is electrically connected with the power source  240 . The abrasive belt wheel motor switch module  42  is electrically connected with the abrasive belt wheel motor  231 . The conveyer motor switch module  43  is electrically connected with the conveyer motor  221 . The emergent stop module  44  is electrically connected with the control module  10 . The emergent stop module  44  can generate a closed signal to stop activation of the control module  10 . When the abrasive belt wheel motor switch module  42  and the conveyer motor switch module  43  are switched off, the closed signal of the emergent stop module  44  is stopped. When the abrasive belt wheel motor switch module  42  and the conveyer motor switch module  43  are switched on again, the control module  10  is activated again. 
     Referring to  FIG. 1  to  FIG. 3 , the power of the belt sander is turned on through the power switch module  41  of the operation module  40 . At this moment, the belt sander is in an initial state, the abrasive belt wheel assembly  230  is located at an initial position. The abrasive belt wheel assembly longitudinal position display unit  33  of the digital display module  30  displays zero, corresponding to the longitudinal position of the abrasive belt wheel assembly  230 . When the abrasive belt wheel motor position detection member  22  detects that the abrasive belt wheel assembly  230  is adjusted by the adjustment member  232  to move longitudinally, the abrasive belt wheel assembly longitudinal position display unit  33  of the digital display module  30  displays the relative value, corresponding to the longitudinal position of the abrasive belt wheel assembly  230 . 
     When the abrasive belt wheel motor switch module  42  of the operation module  40  is switched on, the abrasive belt wheel motor  231  of the abrasive belt wheel assembly  230  is driven by the motor drive member  11  of the control module  10  and the digital display module  30  displays that the abrasive belt wheel motor  231  is activated. At this moment, the abrasive belt wheel motor  231  is in an idle state. The current load display unit  34  of the digital display module  30  displays the relative equalization instruction, corresponding to the idle state of the abrasive belt wheel motor  231 . 
     When the conveyer motor switch module  43  of the operation module  40  is switched on, the conveyer motor  221  of the conveyer assembly  220  is driven by the conveyer motor control member  12  of the control module  10  and the digital display module  30  displays that the conveyer motor  221  is activated. At this moment, the conveyer rotation speed detection member  21  detects the rotation speed of the conveyer motor  221 . The conveyer motor rotation speed display unit  32  of the digital display module  30  displays the relative data of the rotation speed, corresponding to the rotation speed of the conveyer motor  221 . 
     When the workpiece is placed on the conveyer assembly  220  to be polished by the abrasive belt wheel assembly  230 , the abrasive belt wheel motor  231  will increase load because of driving the abrasive belt wheel assembly  230  to polish the workpiece. At this moment, the current flow of the abrasive belt wheel motor  231  will increase accordingly. The current load display unit  34  of the digital display module  30  displays the relative equalization instruction, corresponding to the load state of the abrasive belt wheel motor  231 . When the current of the abrasive belt wheel motor  231  overloads, the current load display unit  34  of the digital display module  30  will immediately display a warning equalization instruction, and the rotation speed of the conveyer motor  221  is lowered by the conveyer motor control member  12  of the control module  10 . In the meanwhile, the conveyer motor rotation speed display unit  32  of the digital display module  30  displays the relative data, corresponding to the rotation speed of the conveyer motor  221 . 
     It is noted that when the user presses the emergency stop module  44  of the operation module  40 , a closed signal is generated to turn off the power source of the belt sander so as to stop all operations. When it is necessary to restart the power, the abrasive belt wheel motor switch module  42  and the conveyer motor switch module  43  which are still in the “on” position must be switched to the “off” position first, and then the abrasive belt wheel motor  231  and the conveyer motor  221  are restarted through the abrasive belt wheel motor switch module  42  and the conveyer motor switch module  43 . 
     Although particular embodiments of the present invention have been described in detail for purposes of illustration, various modifications and enhancements may be made without departing from the spirit and scope of the present invention. Accordingly, the present invention is not to be limited except as by the appended claims.