Dustproof structure of grinding tool holder

Abstract

A dustproof structure of a grinding tool holder, which comprises a shaft portion and a counterweight portion connected to one end of the shaft portion. The counterweight portion comprises an eccentric block connected to the shaft portion, at least one bearing mounted in the eccentric block, a dustproof ring, and a grinding member assembling head assembled with the bearing. The eccentric block is formed with an assembly port for disposing the bearing and the dustproof ring, the dustproof ring is located on a side of the bearing facing the grinding member assembling head, and formed with a first continuous concave-convex structure on a side away from the bearing, the grinding member assembling head is formed with a second continuous concave-convex structure on a side facing the dustproof ring, the first and second continuous concave-convex structures match with each other and define dust blocking dots.

What is claimed is: 
     
         1 . A dustproof structure of a grinding tool holder, the grinding tool holder assembled with a motor and provided for a grinding tool to be assembled therewith optionally, the grinding tool holder comprising:
 a shaft portion, assembled with the motor; and   a counterweight portion, connected to one end of the shaft portion, the counterweight portion comprising an eccentric block connected to the shaft portion, at least one bearing mounted in the eccentric block, a dustproof ring, and a grinding member assembling head assembled with the at least one bearing, wherein the eccentric block is formed with an assembly port to provide the at least one bearing and the dustproof ring for disposal therein, the dustproof ring is located on a side of the at least one bearing facing the grinding member assembling head, the dustproof ring is formed with a first continuous concave-convex structure on a side distant from the at least one bearing, the grinding member assembling head is formed with a second continuous concave-convex structure on a side facing the dustproof ring, and the first continuous concave-convex structure and the second continuous concave-convex structure coordinate with each other and jointly defining a plurality of dust blocking dots.   
     
     
         2 . The dustproof structure of the grinding tool holder as claimed in  claim 1 , wherein the first continuous concave-convex structure comprises a step portion and a branch portion extending from a side of the step portion, the branch portion is horizontal to a surface of the grinding member assembling head facing the dustproof ring. 
     
     
         3 . The dustproof structure of the grinding tool holder as claimed in  claim 2 , wherein the dustproof ring comprises an outer ring edge and an inner ring edge, and the first continuous concave-convex structure is disposed close to the inner ring edge. 
     
     
         4 . The dustproof structure of the grinding tool holder as claimed in  claim 3 , wherein the counterweight portion comprises a limiting ring mounted in the assembly port for limiting a position of the dustproof ring. 
     
     
         5 . The dustproof structure of the grinding tool holder as claimed in  claim 4 , wherein an outer diameter of the limiting ring is larger than an outer diameter of the dustproof ring. 
     
     
         6 . The dustproof structure of the grinding tool holder as claimed in  claim 4 , wherein the shaft portion is formed with an air guide channel communicating with the assembly port, and a mounting groove communicating with the air guide channel to provide for installing a motor paddle, and wherein an airflow is induced into the air guide channel by the mounting groove when the motor rotates. 
     
     
         7 . The dustproof structure of the grinding tool holder as claimed in  claim 5 , wherein the dustproof ring comprises an inclined surface facing the grinding member assembling head. 
     
     
         8 . The dustproof structure of the grinding tool holder as claimed in  claim 6 , wherein the dustproof ring comprises a pushing block disposed on a side facing the at least one bearing to contact with the at least one bearing. 
     
     
         9 . The dustproof structure of the grinding tool holder as claimed in  claim 6 , wherein an outer diameter of the dustproof ring is larger than an outer diameter of the at least one bearing, and an outer diameter of the limiting ring is larger than an outer diameter of the dustproof ring. 
     
     
         10 . The dustproof structure of the grinding tool holder as claimed in  claim 1 , wherein the dustproof ring comprises an inclined surface facing the grinding member assembling head. 
     
     
         11 . The dustproof structure of the grinding tool holder as claimed in  claim 1 , wherein the counterweight portion comprises a limiting ring mounted in the assembly port to limit a position of the dustproof ring. 
     
     
         12 . The dustproof structure of the grinding tool holder as claimed in  claim 1 , wherein the shaft portion is formed with an air guide channel communicating with the assembly port, and a mounting groove communicating with the air guide channel and provided for installing a motor paddle, and wherein an airflow is induced into the air guide channel by the mounting groove when the motor rotates.