Electric drill is a drilling machine that uses electricity to do the power. Is the power tool in the conventional products, but also the largest demand for power tool products. The annual production and sales account for 35% of China's power tools.
The main specifications of electric drill are 4, 6, 8, 10, 13, 16, 19, 23, 32, 38, 49mm, etc. The number refers to the maximum diameter of drill bit drilling on steel with tensile strength of 390N/mm2. For non-ferrous metals, plastics and other materials, the maximum diameter of drilling holes is 30~50% larger than the original specifications.
The working principle of electric drill is electromagnetic rotary or electromagnetic reciprocating small capacity motor motor rotor to do magnetic field cutting to do work operation, through the transmission mechanism to drive the operating device, drive the gear to increase the power of the drill, so that the drill scrapes the surface of the object, better piercing the object.
Electric drill can be divided into 3 types: hand electric drill, hammer drill, hammer drill.
1. Electric drill: the minimum power, the scope of use is limited to drill wood and when an electric screwdriver, part of the electric drill can be changed into special tools according to the use, use and model more
2. Impact drill: The impact mechanism of impact electric drill has two kinds: canine type and ball bearing type. Ball bearing electric impact drill is composed of moving disc, fixed disc, steel ball, etc. The moving disc is connected with the spindle through threads, and has 12 steel balls; The fixed plate is fixed on the housing with pins, and has 4 steel balls. Under the action of thrust, 12 steel balls roll along the 4 steel balls, so that the carbide drill bit produces rotary impact movement, and can drill holes on brittle materials such as bricks, blocks and concrete. Take off the pin, so that the fixed plate with the disk rotation, no impact, can be used as an ordinary electric drill
3 hammer drill (electric hammer): can drill holes in a variety of hard materials, the widest range of use.
