In 1895, the German overtone made the world’s first DC drill. The housing is made of cast iron and can drill a 4mm hole in the steel plate. Then a three-phase power frequency (50Hz) electric drill appeared, but the motor speed failed to break through 3000r/min. In 1914, electric tools driven by single-phase series excitation motors appeared, and the motor speed reached more than 10000r/min. In 1927, an intermediate frequency power tool with a power supply frequency of 150-200Hz appeared. It not only has the advantages of high speed of a single-phase series motor, but also has the advantages of a simple and reliable structure of a three-phase power frequency motor, but it needs to be powered by an intermediate frequency current. , use is restricted.

A power tool is a mechanized tool that uses an electric motor or an electromagnet as the power and drives the working head through a transmission mechanism. According to the “National Economic Industry Classification” (GB/T4754-2011), the company’s industry belongs to the sub-category “Pneumatic and Power Tool Manufacturing” (code C3465) of the broad category “General Equipment Manufacturing”. Power tools are mainly divided into metal cutting power tools, grinding power tools, assembly power tools and railway power tools. Common power tools are Cordless Brushless Hammer Drill DC2808/20V, electric grinders, belt grinders, electric wrenches, electric screwdrivers, electric hammers, concrete vibrators, electric planers, angle grinders, electric saws, sanders, angle grinders, blowers, polishing machine, sander, etc.

The upstream industries of power tools are suppliers of raw materials (such as silicon steel sheets, enameled copper wires, aluminum parts, plastics, etc.), and the industry is more sensitive to the price changes of the above-mentioned raw materials. The application areas of power tools include construction roads, decoration, wood processing, metal processing and other manufacturing industries. Influenced by the government’s policy of stimulating domestic demand and increasing investment in infrastructure, the future development prospects of the construction road and metal processing industries are promising, thereby driving the increase in demand for the power tool industry.