Grinding device

Abstract

The present invention relates to a grinding device for machining an, in particular plate-shaped workpiece (W). The grinding device comprises an emitter (31) for emitting electromagnetic waves in the direction of the abrasive belt (10) and a detector (32) for detecting electromagnetic waves which are reflected by the abrasive belt (10).

1 . A sanding device for machining a workpiece, comprising:
 a holding fixture for holding an abrasive belt,   an emitter for emitting electromagnetic waves in the direction of the abrasive belt, and   a detector for detecting electromagnetic waves that are reflected by the abrasive belt.   
     
     
         2 . The sanding device according to  claim 1 , characterised in that the emitter and the detector extend transversely to a direction of movement of the abrasive belt across the entire width of an abrasive belt, or the emitter and the detector can be moved along a guide transversely to the direction of movement of the abrasive belt. 
     
     
         3 . The sanding device according to  claim 1 , characterised in that the sanding device comprises a conveyor element, in particular a conveyor belt, for moving the workpiece in relation to the abrasive belt. 
     
     
         4 . The sanding device according to  claim 1 , characterised in that the holding fixture comprises a first deflection roll and a second deflection roll, wherein a pressure pad for pushing the abrasive belt against a workpiece is provided. 
     
     
         5 . The sanding device according to  claim 4 , wherein the emitter and detector are directed at a portion of the abrasive belt located between the deflection rolls or are pointing in the direction of an area of the abrasive belt where the abrasive belt is resting on one of the deflection rolls. 
     
     
         6 . The sanding device according to  claim 1 , characterised in that the sanding device has a display for displaying the detected intensity of the reflected waves by the detector. 
     
     
         7 . The sanding device according to  claim 6 , characterised in that the sanding device comprises a controller that is set up to compare a the detected intensity of the reflected waves, with identification data of the abrasive belts. 
     
     
         8 . The sanding device according to  claim 1 , characterised in that the sanding device comprises a warning device for issuing an acoustic or visual signal. 
     
     
         9 . The sanding device according to  claim 7 , characterised in that the sanding device furthermore comprises an abrasive belt cleaning unit, wherein it is preferable that operation of the abrasive belt cleaning unit is controlled and/or monitored based on the detection result of the detector. 
     
     
         10 . The sanding device according to  claim 1 , characterised in that a radar sensor is used as an emitter and detector. 
     
     
         11 . A method for examining an abrasive belt, comprising the following steps:
 emission of electromagnetic waves to the abrasive belt, and detection of electromagnetic waves reflected by the abrasive belt.   
     
     
         12 . The method according to  claim 11 , characterised in that the emission and detection takes place during machining of a workpiece with the abrasive belt or during no-load operation of the abrasive belt. 
     
     
         13 . The method according to  claim 11 , characterised in that the grain size and/or level of wear of the abrasive belt is/are identified based on the detection result of the detected intensity of the reflected waves. 
     
     
         14 . The method according to  claim 13 , further comprising the following step: display of the detection result of the detected intensity of the reflected waves, by means of a display. 
     
     
         15 . The method according to  claim 13 , further comprising the following step: output of a visual or acoustic warning signal when it is identified that the determined grain size of the abrasive belt does not correspond to a specified value, or when it is identified that the detected intensity of the detected electromagnetic waves is below a first threshold value or above a second threshold value.