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Electric hammer repair and diagnosis
1. Electrical failure
1. Electrical faults mainly include open circuit, short circuit, and ground, and the rotor commutation ring sparks are large.
2. Most of the faults of the disconnection are the broken wires. Among them, the broken wires are the most common at the root of the handle. Such a broken wire has the characteristic that the power cord of the hammer is connected to the resistance of the multimeter and the switch is pressed. If you move the root of the cord by hand, the reading of the multimeter will change. In addition, the root of the plug is also easy to break, and there are many cases of switch damage. The multimeter for the switch is easy to check. Poor contact of the carbon brush can also cause a disconnection. There are two ways to check the carbon brush machine and poor contact:
3. The first observation is that if the end surface of the carbon brush is smooth, the contact is good, and the contact with the pitted surface is bad. Another check method is to connect the test leads of the multimeter to the appearance of the motor, and use two screwdrivers to press on the brush socket and the rotor at the same time. If it is turned on at this time, it means that the motor is not faulty, and the carbon brush is not connected, indicating that the carbon brush is in contact. bad.
4. The blown stator earrings can also cause the motor to open. The rotor is sometimes broken, the characteristic is that the power cord is connected to the multimeter, and slowly rotate the rotor, the reading will change greatly.
5. The grounding is generally caused by the iron rubbing of the stator and the rotor. The iron rubbing needs to be changed. The other one is the drying caused by water ingress or moisture.
6. Large rotor sparks are generally caused by rotor failure. The rotor needs to be replaced. After the rotor is replaced, observe whether there is iron rubbing. There is a choking noise when the iron is severely turned on. Light iron wiping will work for a long time. The scorched smell current also rises, causing iron rubbing, loosening the screws that fix the stator, loose bearing housings, deformation of the stator shell, and damage to the bearings.
Second, mechanical failure
1. The most important part of the mechanical part failure is no impact and weak impact. The main reason for no impact is the aging of the rubber ring on the piston and the ram, and the large cylinder is erected with the mouth facing down. If the ram can fall freely, then The rubber ring must be aged. When the rubber ring is aged, you can hear the sound of the piston and the hammer impacting each other. After disassembling the machine, you can find that the end surfaces of the piston and the hammer are shiny. The short impact seeds can also cause no impact. Compare the new shock seeds)
2. No oil may also cause weak impact. If the above conditions are normal and there is no impact, then you must observe the large cylinder to see if there is a crack, if there is a crack, you need to replace it.
3. If the motor rotates after turning on the machine, and the sound of compression is not heard when the hammer head rotates, the connecting rod may be broken or the eccentric wheel may be broken.
4. If the motor rotates after turning on, the sound of the hammer head not rotating or being compressed may be the damage of the primary wheel or the shaft of the rotor. Then there is the bad umbrella tooth performance, which means that it is unable to turn or not turn at all.
5. There is also a phenomenon that asks everyone to note that the key is broken. When we check the cooperation between the gear and the shaft, due to the strong friction between the shaft and the gear glue, it is not easy to find the key broken, but it cannot be normal after the load is loaded. jobs.
6. Before replacing the new parts, be sure to clean the stolen goods and oil stains in the fault point so that we can find other faults.
7. Needle roller bearings in the middle cover must be used well. If defective products are used, the shafts of the primary wheels and the rotor can be easily damaged after they are damaged.
1. Electrical faults mainly include open circuit, short circuit, and ground, and the rotor commutation ring sparks are large.
2. Most of the faults of the disconnection are the broken wires. Among them, the broken wires are the most common at the root of the handle. Such a broken wire has the characteristic that the power cord of the hammer is connected to the resistance of the multimeter and the switch is pressed. If you move the root of the cord by hand, the reading of the multimeter will change. In addition, the root of the plug is also easy to break, and there are many cases of switch damage. The multimeter for the switch is easy to check. Poor contact of the carbon brush can also cause a disconnection. There are two ways to check the carbon brush machine and poor contact:
3. The first observation is that if the end surface of the carbon brush is smooth, the contact is good, and the contact with the pitted surface is bad. Another check method is to connect the test leads of the multimeter to the appearance of the motor, and use two screwdrivers to press on the brush socket and the rotor at the same time. If it is turned on at this time, it means that the motor is not faulty, and the carbon brush is not connected, indicating that the carbon brush is in contact. bad.
4. The blown stator earrings can also cause the motor to open. The rotor is sometimes broken, the characteristic is that the power cord is connected to the multimeter, and slowly rotate the rotor, the reading will change greatly.
5. The grounding is generally caused by the iron rubbing of the stator and the rotor. The iron rubbing needs to be changed. The other one is the drying caused by water ingress or moisture.
6. Large rotor sparks are generally caused by rotor failure. The rotor needs to be replaced. After the rotor is replaced, observe whether there is iron rubbing. There is a choking noise when the iron is severely turned on. Light iron wiping will work for a long time. The scorched smell current also rises, causing iron rubbing, loosening the screws that fix the stator, loose bearing housings, deformation of the stator shell, and damage to the bearings.
Second, mechanical failure
1. The most important part of the mechanical part failure is no impact and weak impact. The main reason for no impact is the aging of the rubber ring on the piston and the ram, and the large cylinder is erected with the mouth facing down. If the ram can fall freely, then The rubber ring must be aged. When the rubber ring is aged, you can hear the sound of the piston and the hammer impacting each other. After disassembling the machine, you can find that the end surfaces of the piston and the hammer are shiny. The short impact seeds can also cause no impact. Compare the new shock seeds)
2. No oil may also cause weak impact. If the above conditions are normal and there is no impact, then you must observe the large cylinder to see if there is a crack, if there is a crack, you need to replace it.
3. If the motor rotates after turning on the machine, and the sound of compression is not heard when the hammer head rotates, the connecting rod may be broken or the eccentric wheel may be broken.
4. If the motor rotates after turning on, the sound of the hammer head not rotating or being compressed may be the damage of the primary wheel or the shaft of the rotor. Then there is the bad umbrella tooth performance, which means that it is unable to turn or not turn at all.
5. There is also a phenomenon that asks everyone to note that the key is broken. When we check the cooperation between the gear and the shaft, due to the strong friction between the shaft and the gear glue, it is not easy to find the key broken, but it cannot be normal after the load is loaded. jobs.
6. Before replacing the new parts, be sure to clean the stolen goods and oil stains in the fault point so that we can find other faults.
7. Needle roller bearings in the middle cover must be used well. If defective products are used, the shafts of the primary wheels and the rotor can be easily damaged after they are damaged.