Electric drills can be divided into three categories: hand drills, impact drills, and hammer drills.
1. Hand electric drill: The power is the smallest, and the scope of use is limited to drilling wood and as an electric screwdriver. Some hand electric drills can be changed into special tools according to their purposes, with many uses and models.
2. Impact drill: The impact mechanism of the impact drill has two types: dog tooth type and ball type. The ball impact drill is composed of a moving plate, a fixed plate, and a steel ball. The moving plate is connected with the main shaft through threads, and has 12 steel balls; the fixed plate is fixed on the casing with pins and has 4 steel balls. Under the action of thrust, the 12 steel balls roll along the 4 steel balls. The cemented carbide drill bit produces rotary impact motion, which can drill holes on brittle materials such as bricks, blocks, and concrete. Take off the pin so that the fixed plate rotates with the moving plate without impact, which can be used as a common electric drill.
3. Hammer drill (electric hammer): It can drill holes in a variety of hard materials and has the widest range of use.
The prices of these three kinds of electric drills are arranged from low to high, and the functions are also increased. The selection needs to be combined with their respective scope of application and requirements.
The difference between hand drill, impact drill, hammer drill and electric pick
The electric hand drill only relies on the motor to drive the transmission gear to increase the force of the drill bit to rotate, so that the drill bit can make scraping holes on metal, wood and other materials.
When the impact drill is working, there are two adjustment knobs at the drill chuck, adjustable drill and impact drill. However, the impact drill uses the gears on the inner shaft to beat each other to achieve the impact effect, and the impact force is far less than that of the electric hammer. It can also drill reinforced concrete, but it is not as effective.
The hammer drill (electric hammer) is different. It uses the bottom motor to drive two sets of gear structures. One set realizes the drill, and the other set drives the piston, just like the hydraulic stroke of the engine, which generates a strong impact force, which is accompanied by the drilling. Effect. Strength can split stone into gold.
The electric pick is to let the motor drive the swinging mass to run in the form of bouncing, so that the pick has the effect of gouging the ground. The hydraulic pump pick uses the gas pressure transmitted by the air compressor to drive the pump hammer in the electric pick to bounce back and forth, thereby producing the effect of the pick hitting the ground, but the electric pick only chisels, and its pick does not rotate.
All in all, the electric drill can only drill, and the impact drill can also have a slight hammering effect. Hammer drills can drill and high hammering, while electric pickaxes can only hammer and not drill.
