A portable device for cutting wood with a chainsaw driven by an electric motor. Chainsaw for short. Mainly used for lumber and logging. Compared with chainsaws (see gasoline powered chain saws), chainsaws are simple in structure, easy to manufacture and maintain, easy to operate, reliable in operation, excellent starting performance, and low in vibration and noise. However, long cables are needed, so it is inconvenient to move and the operation scope is limited.
A brief history of
In the 1930s, the world's first chainsaws for logging appeared. At that time, Germany, the Soviet Union, the United States, Britain, France and some Nordic countries have been producing. However, due to the heavy weight and the need for two-person operation, it has not been popularized in logging operations. By the early 1950s, chainsaws were widely used in lumber making due to improvements in structure and performance. The Soviet Union was the biggest user of chainsaws. Japan and other countries are also experimenting with new electric saws to replace the chainsaw. Most of the electric saws commonly used in the world are operated by a single person, weighing 5 ~ 10 kg, and the motor power is not more than 3 kW. _h KNknmanas "K-5" chainsaw was imported from the Soviet Union in 1954, which was mainly used for timber making. In 1957, Changchun Electric Tool Factory began to make M2L2-950 electric saw. After the 1970s, the chainsaw M3L2-950 and M3L-950 were produced successively. By the end of the 1980s, it was still common to use chainsaws in lumberyards in forest areas.
type
According to the nature of the power supply can be divided into single-phase saw, three-phase power frequency saw, three-phase medium frequency saw and DC saw. ① Single-phase electric saw is powered by single-phase commutator motor, which has high speed, small volume, light weight and large starting torque, and adopts power frequency power supply; (2) three-phase power frequency saw with three-phase asynchronous squirrel cage motor as the power, motor structure is simple, reliable operation, easy maintenance, so that the use of power frequency power supply, simplify the power system, but the specific weight of the saw is higher; (3) three-phase intermediate frequency saw with three-phase intermediate frequency asynchronous squirrel cage motor as the power, through a separate frequency conversion device to improve the power supply frequency, has a very high speed, so the weight is lower, and the load speed is stable, high efficiency, safe and reliable, easy to use and maintenance; Dc saw with permanent magnet motor as the power, the motor structure is simple, easy to manufacture, starting current is small, high efficiency, DC power supply is mostly accumulator.
