Electric tool capable of quickly replacing accessories

Abstract

The electric tool comprises an electric tool body and a polishing wheel, the tail end of a power output shaft of the electric tool body is fixedly connected with a limiting rod, and the end, away from the electric tool body, of the limiting rod is inserted into a mounting groove of the polishing wheel. The invention relates to the technical field of electric tools. When the grinding wheel is replaced, the grinding wheel is pushed upwards, air in the containing groove is exhausted through the exhaust assembly, meanwhile, the limiting state of the limiting assembly on the grinding wheel is relieved, and the limiting rod is directly pulled out of the mounting groove of the grinding wheel; then the limiting rod is inserted into the mounting groove of the new polishing wheel and is fixed in the mounting groove of the polishing wheel through the limiting assembly, meanwhile, the sealing assembly seals the exhaust port of the placing groove, finally, the new polishing wheel is mounted at the tail end of the power output shaft of the electric tool, and replacement of the polishing wheel is completed. And the grinding wheel is convenient to replace.

Description

technical field [0001] The present invention relates to the technical field of electric tools, in particular to an electric tool that can quickly replace accessories. Background technique [0002] In 1895, German Overtone manufactured the world's first DC electric drill. The casing was made of cast iron, which could drill a 4mm hole in a steel plate. Later, a three-phase power frequency 50Hz electric drill appeared, but the motor speed failed to exceed 3000r / min. In 1914, electric tools driven by single-phase series excitation motors appeared, and the motor speed reached more than 10,000 r / min. In 1927, intermediate frequency electric tools with a power supply frequency of 150-200 Hz appeared. It has the advantages of simple and reliable structure of the three-phase power frequency motor, but the use is limited due to the need to use intermediate frequency current for power supply. [0003] During the use of the hand-held grinder, due to the different fineness of grinding, ...

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Problems solved by technology

[0002] In 1895, Germany's Panyin manufactured the world's first DC electric drill. The casing was made of cast iron and could drill a 4mm hole on a steel plate. Then a three-phase power frequency 50Hz electric drill appeared, but the motor speed failed to exceed 3000r / min. In 1914, a power tool driven by a single-phase series motor appeared, with a motor speed of more than 10,000r / min. In 1927, an intermediate frequency power tool with a power supply frequency of 150-200Hz appeared, which not only has the high speed of a single-phase series motor It also has the advantages of simple structure and reliability of a three-phase power frequency motor, but its use is limited due to the need for intermediate frequency current power supply

[0003] During the use of the hand-held grinder, different grinding wheels need to be replaced due to the different grinding fineness. The output shaft of the hand-held grinder and the grinding wheel are usually fixedly connected by multiple bolts or threaded shafts, which is troublesome to install and disassemble. , inconvenient quick replacement of grinding wheels

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