Electric grinding machine tool

Abstract

An electric grinding machine tool comprises a grip body, a grinding disc and a battery, the grip body is arranged with a tool shaft connected with the grinding disc, a driving component capable of rotating the tool shaft when receiving power, and a circuit board electrically connected with the driving component and the battery, and the grip body has a battery mount exposed to an outer surface. The board surface of the circuit board is not perpendicular to the tool shaft, the circuit board and the battery mount are respectively positioned on opposite sides of the tool shaft, and a line passes through the circuit board, the battery mount, and the tool shaft. By changing the position of the circuit board, the height of the grip body is reduced, so that the gravity center of the grip body is reduced to improve stability of a grinding operation.

What is claimed is: 
     
         1 . An electric grinding machine tool, comprising a grip body, a grinding disc and a battery, wherein the grip body is arranged with a tool shaft connected with the grinding disc, a driving component capable of rotating the tool shaft when receiving power, and a circuit board electrically connected with the driving component and the battery, the grip body comprising a battery mount exposed to an outer surface, and the electric grinding machine tool is characterized in that:
 a board surface of the circuit board is not perpendicular to the tool shaft, the circuit board and the battery mount are respectively positioned on opposite sides of the tool shaft, and a line passes through the circuit board, the battery mount and the tool shaft.   
     
     
         2 . The electric grinding machine tool of  claim 1 , wherein the grip body is formed with a plurality of ventilation holes forming a air passage passing through the circuit board. 
     
     
         3 . The electric grinding machine tool of  claim 1 , wherein the grip body is formed with a plurality of ventilation holes forming a first air passage passing through the circuit board and a second air passage flowing at a side of the driving component which does not face the circuit board. 
     
     
         4 . The electric grinding machine tool of  claim 1 , wherein the driving component comprises a rotor connected to the tool shaft and a stator cooperating with the rotor. 
     
     
         5 . The electric grinding machine tool of  claim 4 , wherein the electric grinding machine tool comprises an assembled shell arranged in the grip body and provided with the driving component arranged therein, and the assembled shell comprises a pipe body, and two covers respectively arranged at two sides of the pipe body. 
     
     
         6 . The electric grinding machine tool of  claim 1 , wherein the tool shaft is arranged with a counterweight body, and a fan blade mounted on the counterweight body and rotating synchronously with the tool shaft. 
     
     
         7 . The electric grinding machine tool of  claim 6 , wherein the counterweight body has a first counterweight part and a second counterweight part which are configured up and down, the second counterweight part is relatively eccentric to the first counterweight part, and the fan blade is arranged on the second counterweight part. 
     
     
         8 . The electric grinding machine tool of  claim 7 , wherein the grip body is formed with at least one opening respectively facing the counterweight body at an end of the grip body close to the grinding disc. 
     
     
         9 . The electric grinding machine tool of  claim 6 , wherein the grip body is formed with at least one opening respectively facing the counterweight body at an end of the grip body close to the grinding disc. 
     
     
         10 . The electric grinding machine tool of  claim 9 , wherein the grip body defines a side on which the circuit board is arranged as a front side, and the electric grinding machine tool comprises an operation panel arranged on the front side of the grip body and electrically connected with the circuit board. 
     
     
         11 . The electric grinding machine tool of  claim 1 , wherein the grip body comprises, on an inner wall surface, a receiving space facing the driving component and providing an arrangement for the circuit board. 
     
     
         12 . The electric grinding machine tool of  claim 11 , wherein the grip body is formed with a protrusion with respect to an outer surface of the receiving space, the protrusion being provided with a commercial mark thereon. 
     
     
         13 . The electric grinding machine tool of  claim 1 , wherein the battery mount comprises an insertion opening, and a insertion opening direction of the insertion opening is perpendicular to the tool shaft. 
     
     
         14 . The electric grinding machine tool of  claim 1 , wherein the battery mount comprises an insertion opening, and a insertion opening direction of the insertion opening is parallel to the tool shaft. 
     
     
         15 . The electric grinding machine tool of  claim 1 , wherein the grip body defines a side on which the circuit board is arranged as a front side, and the electric grinding machine tool has an operation panel arranged on the front side of the grip body and electrically connected with the circuit board.