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What are the common faults of electric hammer

by:WORKSITE     2020-06-11
Electric hammer is a kind of power tool, mainly used in concrete. Floor. Drilling holes in brick wall and stone. It specializes in drilling holes on walls, concrete, and stone, as well as multi-function electric hammers, which can be used in place of ordinary electric drills and electric pickaxes when adjusted to appropriate positions and equipped with appropriate drill bits. In daily use, what faults will the electric hammer encounter? What should I do if something goes wrong? 1. Electrical hammer electrical failure The electrical failure of the hammer is mainly caused by open circuit, short circuit, grounding, and the rotor commutation ring has a large spark. Most of the faults of the open circuit are the broken wires. The broken wires are the most common at the root of the handle. Such a broken wire has a feature. It is to connect the power cord of the hammer to the resistance of the multimeter. Press the switch and use the hand. The root of the active leather cord, 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 well checked. Poor contact with the carbon brush can also cause a broken circuit. There are two methods of carbon brush machine and no contact: The first observation is that if the end surface of the carbon brush is smooth, the contact is good, and the pitted surface is poorly contacted. Another check method is to connect the test leads of the multimeter to the appearance end 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. bad. If the stator earrings are burnt out, the motor can also be broken. The rotor is also sometimes broken. The characteristic is that the power cord is connected to the multimeter, and the rotor is slowly rotated, and the reading will change greatly. The grounding is generally caused by the iron rubbing of the stator and rotor, and the iron rubbing needs to be changed. For the rotor, the other is drying caused by water or moisture. 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 sound when the iron is severely turned on. If the iron is light, the working time will be burnt. The odor current also rises, and the reasons for iron rubbing are loose screws that fix the stator, the bearing seat is too loose, the stator shell is deformed, and the bearing is damaged. 2. Mechanical failure of electric hammer The most important part of the mechanical failure of the electric hammer is no impact and weak impact. The main reason for the non-impact is the aging of the rubber ring on the piston and the hammer. The large cylinder is erected and the mouth is facing down. If the hammer 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 disassembly, 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 impact seeds) No oil may also cause impact weakness. If the above conditions are normal and there is no impact, then it is necessary to observe the large cylinder to see if there is a crack. If there is a crack, you need to replace it. 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. If the motor rotates after starting up, 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 does not turn at all. There is also a phenomenon that invites everyone to note that the key is broken. When we check the cooperation of the gear and the shaft, due to the strong friction of the shaft and the gear glue, it is not easy to find the key broken, but it cannot work properly after the load is applied. Before replacing the new parts, we must deal with the stolen goods and oil stains in the fault point, so that we can find other faults. The needle roller bearing in the middle cover must be used well. For example, if it is defective, after damage, the shaft of the primary wheel and the rotor can be easily damaged.
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