First, the definition of electric hammer:
An electric rotary hammer drill with a safety clutch with a pneumatic hammering mechanism.
Electric hammer is the use of piston movement principle, compressed gas impact drill bit, do not need to make much force by hand, can
To open 6--100mm holes in hard materials such as concrete, brick, stone, etc., the electric hammer is opened on the above materials
The hole efficiency is high, but it cannot open holes in the metal.
Second, the introduction of the electric hammer:
1. In the electrical tools, electric hammer is a type of electric drill, mainly used in concrete, floor slab, brick
Drilling holes in walls and stone. Professional drilling on walls, concrete, stone, as well as multi-functional electric hammer, tuning
Section to the appropriate position with the appropriate drill bit can replace the ordinary electric drill, electric pick.
2. The electric hammer is based on the electric drill, adding a job with a crankshaft connecting rod driven by the motor
Plug, reciprocating compression of air in a cylinder, so that the air pressure in the cylinder changes periodically, changing the air
The pressure drives the hammer in the cylinder to reciprocate against the top of the drill bit as if we were hitting the drill bit with a hammer. Hence the name
Electric hammer!
3. Because the drill bit of the electric hammer rotates, it also produces a rapid reciprocating along the direction of the electric drill rod
Movement (frequent impact), so it can be played quickly on materials such as cement concrete and stone, which are brittle
Hole. High-grade electric hammer can use the transfer switch to make the drill bit of the electric hammer in different working states, that is, only turn
No impact, only impact without rotation, both impact and rotation.
Third, the characteristics of the electric hammer:
1. Good shock absorption system: it can make the operator comfortable to hold and relieve fatigue.
Implementation: through the "vibration control system"; Increased grip comfort with soft rubber handles;
2. Precise speed control switch: the speed is low when the switch is touched, which can help the machine to start drilling smoothly (for example
Drilling on a smooth surface such as tiles prevents not only the drill bit from slipping, but also the drill hole from breaking.
High speed can be used during normal operation to ensure work efficiency.
3. Stable and reliable safety clutch: also known as torque limiting clutch, to avoid the cause during use
The large torque reaction force generated by the jamming of the drill bit is transmitted to the user, which is a safety guarantee for the user
Protect. This feature also prevents the gear unit and motor from stopping rotation.
4. Comprehensive motor protection device: it is inevitable that granular hard objects will enter the machine during use
(especially for the machine to drill upwards, such as drilling holes on the top of the wall), if the motor does not have a certain protection, in
During high-speed rotation, it is easy to be broken or scratched by hard objects or the enameled wire, which eventually leads to motor failure.
5. Forward and reverse function: it can make the electric hammer more widely used, and its realization form is mainly through opening
Turn off or adjust the position of the carbon brush, usually the big name tool will use to adjust the position of the carbon brush (rotating brush holder).
To achieve, the advantage of this is easy to operate, effectively suppress sparks to protect the commutator, and extend the use of the motor
life span
6. Hammer drill double function.
Fourth, the advantages of electric hammer: the advantages are high efficiency, large aperture and long drilling depth.
Fifth, the working principle of the electric hammer: The principle of the electric hammer is that the transmission mechanism drives the drill bit to do the rotational movement at the same time
There is a reciprocating hammering movement in the direction perpendicular to the turning head. The electric hammer is driven by a transmission mechanism to piston in a steam
The air is reciprocating compressed in the cylinder, and the periodic change of air pressure in the cylinder drives the hammer in the cylinder to hit the brick reciprocatingly
At the top, it seems that we hit a brick with a hammer, hence the name electric hammer.
6. Safe operation of electric hammer:
1. Personal protection when using electric hammer:
1) The operator should wear protective glasses to protect the eyes, and wear them when working with the face up
Protective masks.
2) Plug the earplugs during long-term operation to reduce the impact of noise.
3) After long-term operation, the drill bit is in a burning state, and attention should be paid to burning the skin when replacing.
4) When working, the side handle should be used and operated with both hands to prevent the reaction force from twisting the arm when blocking the rotation.
5) Standing on a ladder to work or working at height should do a good job of falling from a high place, and the ladder should have a ground person
Staff support.
7. Precautions before operation:
1) Confirm whether the power supply connected to the site matches the nameplate of the electric hammer. Whether a leakage protector is connected.
2) The drill bit and gripper should be adapted and properly installed.
3) When drilling walls, ceilings, and floors, check whether there are buried cables or pipes.
4) When working at height, pay full attention to the safety of the following objects and pedestrians, and set up vigilance when necessary
Sign.
5) Confirm whether the switch on the hammer is cut off, if the power switch is on, the plug is inserted into the power outlet
The power tool will turn unexpectedly and immediately, which may introduce a risk of personal injury.
6) If the working place is far from the power supply, when the cable needs to be extended, the capacity should be sufficient.
Install a qualified extension cable. Extension cables, such as through pedestrian walkways, should be elevated or prepared to prevent cables from being crushed
Measures for damage.
8. The use of electric hammer:
1. The inspection before operation should meet the following requirements:
1) The shell and handle do not appear cracks and damage;
2) The cable cord and plug are intact, the switch action is normal, and the protection zero connection is correct.
Robust and reliable;
3) All protective covers are complete and firm, and the electrical protection devices are reliable.
2. After the tool is started, it should run without load, and the tool linkage should be checked and confirmed to be flexible and unimpeded. homework
, the afterburner should be stable and not excessively strong.
3. When working, you should master the electric drill or electric hammer handle, and first put the drill bit against the special-shaped rivet worksheet when punching
surface, then start, moderate force, avoid shaking; If the speed drops sharply, the force should be reduced to block electricity
The machine is overloaded, and it is strictly forbidden to pressurize the wooden carry.
4. When drilling, you should pay attention to avoid the steel bars in the concrete.
5. The electric drill and electric hammer are 40% intermittent working system, and shall not be used continuously for a long time.
6. When the working aperture is above 25mm, there should be a stable working platform, and guardrails should be set up around it.
7. Overload use is strictly prohibited. During operation, attention should be paid to the sound and temperature rise, and abnormalities should be stopped immediately for inspection
Examine. When the working time is too long and the temperature rise of the tool exceeds 60 °C, it should be stopped and cooled naturally before working
Karma.
8. When the machine is rotated, do not let go.
9. During the operation, do not touch the electric hammer saw cutting tool, mold and grinding wheel with your hand, and find that it is dull,
In the event of damage, it should be stopped immediately for repair or replacement before continuing the operation.
9. Common faults and maintenance of electric hammers:
1. Electrical fault:
1) Electric hammer electrical fault: mainly open circuit, short circuit, grounding, rotor commutation ring spark.
2) Circuit break: Most of the faults of the broken circuit are broken leather wires, of which the leather wire is most often broken at the root of the handle
See, such a broken wire has a feature, that is, the power cord of the electric hammer is connected to the resistance file of the multimeter, and will
The switch is pressed, the root of the leather thread is moved by hand, the reading of the multimeter will change, and there is also the insertion
The root of the head is also easy to break, and there are many cases where the switch is broken, and the switch is very good to check the carbon brush connection with a multimeter
Poor contact can also cause open circuit, check the carbon brush machine, poor contact methods are the following two methods:
(1) Observe that the end surface of the carbon brush is smooth and has good contact, and the contact of the hemp surface is poor. And one
One way to check is to connect the multimeter's pen to the motor end and press it to the brush socket with two screwdrivers at the same time
and on the rotor, if it is turned on at this time, it means that the motor is not faulty, and it is not through after the carbon brush, indicating that the carbon brush is not in contact
Good. The stator earrings are burned, which can also cause the motor to break the circuit.
(2) The rotor is sometimes also broken, which is characterized by connecting the power cord to the multimeter and slowly turning and turning
sub, the readings will vary greatly. The grounding is generally caused by the stator and rotor rubbing iron, and the wiping iron needs to be replaced
Decide. The rotor, the other is caused by water or moisture drying can be. Rotor sparks are generally large
It is caused by rotor failure, the rotor needs to be replaced, and after the rotor is replaced, it is necessary to observe whether there is iron wiping phenomenon, and the iron wiping is strict
There is a choking sound when the heavy boot is started, and the light working time of the iron wiping will have a scorched smell and the current will rise,
The causes of iron rubbing are: loose screws fixing the stator, too loose bearing housing, deformation of the stator housing, and bearing damage
Bad, etc.
2. Mechanical failure:
1) Electric hammer mechanical part failure: the main thing is no impact and impact weakness, no impact is the most important
The reason is that the rubber ring on the piston and hammer is aging, and the large cylinder is erected with the mouth facing down, such as the hammer can be free
Falling, the rubber ring must be aging, the rubber ring aging can hear the piston and the hammer hitting each other when working
The sound of dismantling, after dismantling, you can find that the end faces of the piston and punch are shiny, and the short impact seed can also cause no impact (yes
Compare with the new shock seeds)
2) No oil may also cause impact weakness: if the above conditions are normal and there is no impact, then it must be
It is necessary to observe the large cylinder well to see if there are cracks, and those with cracks need to be replaced.
3) After starting, the motor turns: the hammer head turns and cannot hear the sound of compression, which may be a broken connecting rod or eccentric wheel
Break. If the motor rotates after starting, the hammer does not rotate and there is no compression sound may be damaged by the first stage wheel or the rotor
Shaft break. Then there is the bad of the canopy tooth, which is manifested as a weak turn or no turn at all.
4) Key breakage: When we check the fit of gear and shaft, due to strong friction shaft and gear glue
Together, it is not easy to find the break of the key, but it will not work properly when the load is applied.
5) Replace new parts: Before replacing new parts, be sure to clean the stolen goods and oil stains in the fault point,
So that we can find other faults.
6) The needle roller bearing in the middle cover must be used well, if a defective product is used, it can be combined after he is damaged
Both the shaft of the first stage wheel and the rotor are easily damaged.
