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Understand the development history of Delikai power tools

by:WORKSITE     2021-01-03
Applied disciplines: mechanical engineering (first-level discipline); fitter and equipment (second-level discipline);

Common terms for fitter and equipment (third-level discipline) The above content is reviewed and released by the National Science and Technology Term Review Committee


In 1895, Germany produced the world's first DC electric drill. The shell is made of cast iron and can drill 4mm holes in the steel plate. Then there was a three-phase power frequency (50Hz) electric drill, but the motor speed failed to break 3000r/min. In 1914, Delikai electric tools driven by a single-phase series motor were presented, and the motor speed reached more than 10000r/min. In 1927, a medium-frequency Delikai electric tool with a power supply frequency of 150-200 Hz was presented. It not only has the benefit of a single-phase series motor with high speed, but also has the benefit of a simple and reliable three-phase power frequency motor structure. Medium frequency current power supply, use is restricted.

History development

In the 1960s, with the opening of battery manufacturing technology, a battery-type Delikai power tool without a power cord using nickel-cadmium batteries as the power source was presented. However, the opening was slow due to the high price. In the mid-to-late 1970s, due to lower battery prices and shorter charging times, this Delikai electric tool was widely used in Europe, America and Japan. Delikai power tools began to use cast iron as the shell, and later switched to aluminum alloy as the shell. In the 1960s, thermoplastic engineering plastics were used in Delikai power tools, and the two-layer insulation of Delikai power tools was completed, ensuring the safety of the use of Delikai power tools. Because of the opening of electronic technology, electronic speed control Delikai power tools were also presented in the 1960s. This kind of Delikai electric tool uses thyristor and other components to form an electronic circuit, and the switch is pressed into the depth of the switch to control the speed, so that the Delikai power tool can be processed according to the different processing policy (such as The data is different, the diameter of the drilling hole, etc.), select a different speed.
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