Electric drill is mainly composed of motor, gearbox, handle, drilling chuck or cone sleeve micro and power connection device.
The basic structure of the electric drill: L-drill chuck; 2—drill shaft; 3—gearbox; 4—intermediate disc; 5—Fan; 6—chassis; 7—stator; 8—Charcoal brush; 9—commutator; 10—handle; 11—switch; 12—Rotor
Type of drill
A-type electric drill: mainly used for drilling ordinary steel, it has high drilling productivity, strong applicability of general bihe, complete specifications, generally using secondary speed change.
Type B electric drill: mainly used for drilling high-quality steel and various steels, with high drilling productivity. The rated output power and torque of this type of electric drill are larger than that of type A, and the continuous and overload capacity is strong, and the speed is similar to that of type A, and the two-stage speed is generally adopted.
C-type electric drill: mainly used for the drilling of non-ferrous metals such as aluminum and copper and their alloys, plastics and cast iron, and has high drilling productivity, and can also be used for drilling ordinary steel. The drill is lightweight and simple in construction.
The use of electric drills
1. Use the specified voltage. The line voltage used by the electric drill does not exceed ±10% of the voltage specified on the electric drill nameplate.
2. The use of drill chuck and conical sleeve. Drills up to 19 mm generally use a three-jaw drill bit clamp, which is specially equipped and specially designed and manufactured for electric drills. Electric drills over 19 mm generally use conical sleeves. When installing the drill bit, first remove the debris on the surface of the drill bit hole and the drill shaft, including anti-rust grease, etc., and then install the drill bit tightly on the drill shaft.
3. Inspection before use:
A. Check whether the transmission part is flexible, whether there is noise, and whether the commutation spark is normal.
B. The insulation resistance must be measured with a 500V megohmmeter before use, and the insulation between the winding and the casing must be greater than 0.5MΩ.
C. Overload is strictly prohibited when using electric drills.
D. When the brush of the electric drill is seriously worn, the brush should be replaced in time, which will cause damage to the commutator and burn the armature in serious cases.
E. During the use of electric drills, those who are currently in any of the following situations in China shall not continue to be used:
(1) The insulation of the power line is damaged and the cable sheath is broken.
(2) The power plug and socket are in poor contact.
(3) There is an abnormal sound during operation.
(4) The spark of the brush and commutator is too large, causing the ring fire.
(5) The bearing temperature and armature temperature are overheated.
