1, hand electric drill: the power is the smallest, and its application scope is limited to drilling wood and being used as an electric screwdriver, so it has little practical value.
2. Impact drill: The impact mechanism of impact drill has two types: dog tooth type and ball tooth type. The ball impact drilling rig consists of a moving disk, a fixed disk and steel balls. The turntable is connected with the spindle through threads, and there are 12 steel balls on the turntable; The fixed disk is fixed on the shell with pins and has four steel balls. Under the thrust, the 12 steel ball rolls along the four steel balls, which makes the cemented carbide drill produce rotary impact motion and can drill holes in brittle materials such as bricks, blocks and concrete. The pin is separated, so that the fixed disk and the driven disk rotate together without impact, and it can be used as an ordinary electric drill.
3. Hammer drill (electric hammer): It can drill holes in any material and has the widest application range.
The prices of these three kinds of electric drills are arranged from low to high, and their functions have also increased. When choosing them, it is necessary to combine their respective application scope and requirements.
Similarities and differences among electric drills, electric hammers and impact drills There is only one rotation mode for electric drills, which is especially suitable for drilling holes in materials such as cork, metal, bricks and tiles that require little power. An electric hammer works by rotating and knocking. The strength of a single hit is very high, and the frequency of hitting every minute 1000 to 3000 times can produce significant strength.
Compared with impact drills, electric hammers need the least pressure to drill into hard materials, such as stones and concrete. Especially relatively hard concrete.
An impact drill works by rotation and impact. A single impact is very slight, but an impact frequency of more than 40,000 times per minute can generate a continuous force. Impact drills can be used for natural stones or concrete. They are universal, because they can use both "single drill" mode and "impact drill" mode, so they are the basic power tools worth choosing for professionals and do-it-yourself people.
Electric drills, hammers and percussion drills are all used to drill holes. Electric hammers are usually used to drill holes in hard objects such as concrete. The drill bit is made of alloy steel and has the function of hammering while drilling. Electric drills are used to drill holes in relatively hard objects, and drill bits are generally made of steel.
An impact drill has the functions of both an electric hammer and an electric drill. It can be used as both an electric hammer and an electric drill. There are also two kinds of drills.
The essential difference between an electric drill and an electric hammer is that (1) is different in size. (2) Of course, the weight is different. The electric drill only has the number of revolutions when the motor (rotor+stator) and the gear are engaged with each other, but the electric hammer is different. It should be called "hammer", so it has impact force and can drill hard substances such as concrete and stone. Therefore, the electric hammer is a little bigger than the electric drill, because there are important accessories such as cylinder, connecting rod and piston in the electric hammer.
Electric drills can only drill wood, iron sheet, plastic and other materials.
The electric hammer uses the movement of the piston to impact the drill bit with compressed gas. It can drill holes of 6- 100 mm on hard materials such as concrete, bricks and stones without too much effort by hand. Electric hammer has high drilling efficiency on the above materials, but it can't drill holes on metal.
The electric drill is non-impact and needs manpower to press holes in materials such as metal and wood, with a diameter of 6-50 mm. Its advantages are small vibration, high drilling accuracy and low price. In addition, they use different drills, the former is an alloy inlay drill and the latter is a common cutting drill. Both electric hammers and percussion drills can make holes in concrete structures.
Both of them have the function of piston movement, and the electric hammer is suitable for large caliber above 30 mm, with the advantages of high efficiency, large aperture and long drilling depth. The disadvantage is that the vibration is large and the surrounding structure is damaged to a certain extent. Impact drills are suitable for small diameter and short drilling depth of about 25mm. Such as installing expansion bolts.
The damage to the surrounding structure is very small. Air conditioning installation in addition to the wall hole, should use electric hammer. Use electric drills in other positions. Air conditioning installation method and process >:>
Difference; The electric hammer bit is assembled by locking clip, which is simple and does not need any tools. The impact drill bit needs a special key to tighten it.